To see the other types of publications on this topic, follow the link: Long jump.
Dissertations / Theses on the topic 'Long jump'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Long jump.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Griffiths, Gillian. "Long jump : the developing technique in young females." Thesis, Liverpool John Moores University, 2011. http://researchonline.ljmu.ac.uk/6021/.
Full text
2
Mo, Stacy (Stacy M. ). "Dynamic optimization of two methods of the long jump." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112557.
Full textAbstract:
Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.Cataloged from PDF version of thesis.
Includes bibliographical references (page 45).
In this thesis, I analyzed, modelled, and optimized two different techniques of the long jump: the hitchkick and hang. Using video data, I made a dynamic model of both techniques, then created a cost function that took torques and angles into consideration to simulate physical limitations. Using a function minimizing optimizer, trajectories were simulated over a range of torque limits and angle penalties. Over the course of 292 simulations, we found that the hitchkick technique improved jump distances more than the hang technique, improving by up to 34.65% with an average of 7.7% while the hang technique increased jump distance by a maximum of 30.21%, with an average of -15.89%.
by Stacy Mo.
S.B.
3
Bergander, Andreas, and Jesper Rask. "Samband mellan spänst och långdistanslöpning hos unga elitaktiva orienterare- en tvärsnittsstudie." Thesis, Uppsala universitet, Åsenlöf: Fysioterapi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-402334.
Full textAbstract:
Introduction: Running economy (RE) is known to be a strong indicator for performance on long distance running. RE is improved by plyometric training through an increase in stiffness in the musculotendinous system. Stretch shorten cycle (SSC) is a function in the muscle where a contraction is preceded by a stretch or an eccentric action. Orienteering is an endurance sport where RE is important for performance. Purpose: The purpose of the study was to examine whether or not there is a correlation between jumping performance and performance on long distance running in young elite orienteers 16-19 years old. Methods: 34 young elite orienteers did drop jumps (DJ) and countermovement jumps (CMJ) on an ErgoJump Bosco System contact mat. In conjunction with the jumps time on a 5 or 7 km (for girls and boys respectively) running test was collected. Pearson's correlation test was then used to determine the correlation between jumping height and running velocity. Results: The jumping height of the CMJ was on average 30,46 cm and 28,24 cm for the DJ. The running velocity was on average 14,19 km/h. Pearson's correlation test for the correlation between DJ and running velocity was 0,463 and for the correlation between CMJ and running velocity it was 0,461. In both cases the significance was 0,006. Conclusions: There is a significant, moderate to strong correlation between jump height in DJ and CMJ and performance on long distance running on a running test in young elite orienteers.
4
Muñiz, Pablo E. (Muñiz Aponte). "Detection of launch frame in long jump videos using computer vision and discreet computation." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/123277.
Full textAbstract:
Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2019Cataloged from PDF version of thesis.
Includes bibliographical references (page 44).
Pose estimation, a computer vision technique, can be used to develop a quantitative feedback training tool for long jumping. Key performance indicators (KPIs) such as launch velocity would allow a long jumping athlete to optimize their technique while training. However, these KPIs need a prior knowledge of when the athlete jumped, referred to as the launch frame in the context of videos and computer vision. Thus, an algorithm for estimating the launch frame was made using the OpenPose Demo and Matlab. The algorithm estimates the launch frame to within 0.8±0.91 frames. Implementing the algorithm into a training tool would give an athlete real-time, quantitative feedback from a video. This process of developing an algorithm to flag an event can be used in other sports as well, especially with the rise of KPIs in the sports industry (e.g. launch angle and velocity in baseball).
by Pablo E. Muniz.
S.B.
S.B. Massachusetts Institute of Technology, Department of Mechanical Engineering
5
Zushi, Mihoko. "Long-distance dependencies." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=28974.
Full textAbstract:
This thesis proposes a modification of Chomsky's (1992) theory of locality to deal with restructuring phenomena which allow an apparent violation of the locality condition on certain local processes. Various restructuring phenomena including long-distance NP movement exemplified by long-distance Object Preposing (Chapter 2) and long-distance head movement exemplified by clitic climbing (Chapter 3) are examined cross linguistically. Long-distance anaphora (Chapter 4) are also examined based on the view the locality on various types of anaphor-antecedent relationships follow from the theory of movement.It is argued that the peculiar behavior of restructuring constructions in terms of locality follows from the lexical properties of restructuring verbs that allows a defective Tense to occur in the complement clause. The following effects result: (i) Case checking within the embedded clause becomes impossible; (ii) the defective Tense triggers incorporation of the infinitive verb into the matrix verb. As a result, the embedded element that requires Case is forced to raise into the matrix clause as a last resort operation, hence motivation long-distance movement.
In order to reconcile long-distance movement with the economy principle which requires chain links to be minimal, this thesis refines Chomsky's (1992) theory of locality. The proposed hypothesis claims that the locality condition on certain operations such as NP movement and head movement follows from the economy principle in such a way that an element can move to the closest position in which its morphological requirement can be satisfied. This notion of the shortest movement is further clarified in that the domain in which the shortest movement requirement is satisfied can be extended if there is an appropriate linked chain formed by head movement. The proposed system not only provides principled account for the phenomena of restructuring, but also has some important implications for the notion of economy of derivation.
6
Mccosker, Christopher Mark. "Interacting constraints in high performance long jumping." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/204284/1/Christopher_McCosker_Thesis.pdf.
Full textAbstract:
This thesis details a series of studies investigating long jump locomotor pointing tasks through a theoretical framework of ecological dynamics. A multi-methods approach was used to investigate athlete behaviours in competition environments revealing the complexities of field-based locomotor pointing tasks, providing important information for the design of practice environments for practitioners. The development of a new substantive theoretical model of perform, respond and manage, presents as a novel tool for practitioners in understanding emergent behaviour in long jump and can be used to better frame representative learning designs. Importantly, athletes need to prepare for more than just a technical performance.
7
Денисов, Станіслав Іванович, Станислав Иванович Денисов, Stanislav Ivanovych Denysov, and Y. S. Bystrik. "Long-time solutions of decoupled continuous-time random walks with asymmetric heavy-tailed jump length distributions." Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/27608.
Full text
8
Bringsén-Bornegrim, Mimmi. "Standing long jump compared to vertical jump as a field test for assessing leg power in firefighter trainees : A correlation study from a gender equality perspective." Thesis, Högskolan i Halmstad, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-44599.
Full textAbstract:
Background: Within the rescue service, a varied background is needed to increase the possibility of delivering equal service to the citizens. At present, there is a skewed gender distribution within the municipal rescue services, with only a couple of percent of the firefighters being women. Many women find it difficult to meet the physical limit values on recruitment tests. The standing long jump (SLJ) is used as a part of recruitment tests on many rescue services, to assess leg power. It is not clear though whether SLJ is the most appropriate field-test to assess leg power in firefighter trainees, with men and women mixed in the same group, as it has been argued that anthropometric factors, such as body height (BH), affects the result. Thereby we wanted to study the relationship between BH and SLJ, and compere SLJ with another field-test for measuring leg power, one that omits the variable BH. Aim: The aim was to study the strength of the relationship between body height and the jump length at standing long jump, for firefighter trainees. A second aim was to study the strength of the relationship between firefighter trainees' jump results of the two tests: standing long jump and vertical jump. Methods: The study was executed as an observational cross-sectional study. Three different measurements were carried out: BH, vertical jump (VJ) and SLJ. Correlation analyzes, with Pearson's correlation coefficient, were performed on BH in relation to SLJ, and VJ in relation to SLJ. Results: Fourteen (n = 14) firefighter trainees (women n = 5, men n = 9) met the inclusion criteria and participated in the study. Subjects' age, body mass index (BMI) and number of workouts per week were 29 ± 7 years old, 25 ± 2 kg/m2 and 4 ± 1 workouts (at least 30 minutes) per week. Results showed a significant moderate correlation between BH and SLJ (r = 0.572). Between the variables VJ and SLJ there were a significant strong correlation (r = 0.862). However, the results changed substantially when the analyzes were performed separately for men and women, with a very low correlation level (r = 0.106 respective r = 0.166) between BH and SLJ. For VJ and SLJ there were a moderate correlation level for men and low for women (r = 0.414 respective r = 0.387). Conclusion: The result from this study is in line with aforementioned work and supports the hypothesis that BH to some extent can affect the jump result at SLJ. Our study complements earlier work and indicates that these results are also applicable to firefighter trainees. The findings in this study indicates VJ could possibly be an alternative field test for SLJ, to assess leg power when recruiting new firefighters. Additional studies are required to investigate the correlation between SLJ and VJ with ad- ditional confounders, such as actual leg power, and also the correlation between VJ and fire- fighters heaviest among most common work tasks.
9
Schirmer, Dennis. "Prediktorer för sprintförmåga på is hos elitishockeyspelare. : Kan prestation på is förutspås av styrke- och spänsttester?" Thesis, Linnéuniversitetet, Institutionen för idrottsvetenskap (ID), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-43692.
Full textAbstract:
BAKGRUND: Ishockey är en stor idrott med över 80000 aktiva spelare i Sverige. SYFTE: Syftet med denna studie var att fastställa huruvida det finns korrelation mellan tester rekommenderade av Svenska Ishockeyförbundet och prestationsförmåga på is. Vidare skulle testresultaten ställas i relation till antropometriska värden. METOD: Studiepopulationen rekryterades från hockeylag i division I. Testerna 1RM knäböj, stående längdhopp samt sergants jump utfördes enligt Svenska Ishockeyförbundets rekommenderade förfarande. Prestationsförmåga på is mättes genom 17 m sprintlopp. Korrelationen mellan testerna och prestation på is beräknades med pearsons korrelationskoeffecient. P<0.05 betraktades som signifikant. RESULTAT: Totalt rekryterades 34 ishockeyspelare från division 1 (100 % män, medel ± SD: ålder 22,7 ±2.24 år; vikt 85,3 ±6,4 kg; längd 182 ±6 cm). Av utförda tester var det endast 1RM knäböj/kroppsvikt-ratiot som med statistisk signifikans visades korrelera med prestationsförmågan på is (r=0,389, p=0,049). Övriga tester uppvisade ingen statistisk signifikans. SLUTSATS: Studiens resultat pekar mot att det finns en svag statistiskt signifikant korrelation mellan 1RM knäböj/kroppsvikt-ratio och sprintförmåga på is. Knäböj/kroppsvikt-ratiot svarar dock endast för en liten del av prestationsförmågan på is, varvid knäböjens starka position som grundövning utanför isen bör ifrågasättas.BACKGROUND: Ice hockey is a large sport with over 80000 active players in Sweden. PURPOSE: The aim of this study was to determine whether there are correlations between tests recommended by the Swedish Ice Hockey Federation and on-ice performance. The results were also to be examined in relation to antropometric values. METHOD: The studypopulation was recruited from Swedish tier-III teams. The 1RM squat, standing long jump sand sergants jump were performed as described by the Swedish Ice Hockey Federations guidelines. On-ice performance was measured by a 17m sprint. The correlation between off- and on-ice tests were calculated using pearsons correlation coefficient. Statistical significance was set to P<0.05. RESULTS: Thirtyfour male ice hockey players from Swedish tier-III were recruited for the study (100% men, mean ± SD: age 22,7 ±2.24 years; weight 85,3 ±6,4 kg; length 182 ±6 cm). Out of the performed tests only 1RM squat/bodywight-ratio showed a statistical significant correlation to on-ice performance (r=0,389, p=0,049). The other tests did not show statistical significance. CONCLUSION: The results points towards a weak statistical significant correlation between 1RM squat/bodywight-ratio and on-ice sprinting ability. The 1RM squat/bodyweight-ratio however explained a small portion of on-ice performance, hence the squats strong position as basic exercise off-ice should be questioned.
10
Miri, Amir Masoud. "Long acoustic cladded buffer rods." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60688.
Full textAbstract:
Experimental investigations and theoretical considerations of long acoustic cladded buffer rods are presented and theory superiority over uncladded rods is shown. These rods consist of a core and a cladding which are so designed to confine acoustic energy in the core, giving rise to a perfect guidance. Different rods with different core dopant material, concentration and profile were designed and their acoustic performance was studied by ultrasonic pulse-echo experiment. Tapered rods are also introduced. A cladded silica rod of a large diameter is tapered gradually to a rod of a small diameter and gives it the ability to be used where tiny features or openings are dealt with. Novel metalic acoustic rods both cladded and uncladded are presented and a comparison is made between these rods and conventional metal rods. Acoustic lenses are fabricated at the end of a few rods including cladded silica tapered silica and cladded metalic rods and ultrasonic focus and unfocus measurements carried out at 5 and 10MHz are presented for all the rods.Finally, the application of our unique rods at elevated temperatures is discussed. Ultrasonic measurements are performed at medium temperatures (up to 270$ sp circ C$) on a high viscosity liquid and at high temperatures (around 750$ sp circ C$) on molten aluminum. It is shown that our cladded acoustic rods are proper candidates for use at high temperatures to monitor the properties of molten metals specially good for molten aluminum or low melting point temperature (below 1000$ sp circ C$) metals.
11
Ko, Kyungduk. "Bayesian wavelet approaches for parameter estimation and change point detection in long memory processes." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/2804.
Full textAbstract:
The main goal of this research is to estimate the model parameters and to detect multiple change points in the long memory parameter of Gaussian ARFIMA(p, d, q) processes. Our approach is Bayesian and inference is done on wavelet domain. Long memory processes have been widely used in many scientific fields such as economics, finance and computer science. Wavelets have a strong connection with these processes. The ability of wavelets to simultaneously localize a process in time and scale domain results in representing many dense variance-covariance matrices of the process in a sparse form. A wavelet-based Bayesian estimation procedure for the parameters of Gaussian ARFIMA(p, d, q) process is proposed. This entails calculating the exact variance-covariance matrix of given ARFIMA(p, d, q) process and transforming them into wavelet domains using two dimensional discrete wavelet transform (DWT2). Metropolis algorithm is used for sampling the model parameters from the posterior distributions. Simulations with different values of the parameters and of the sample size are performed. A real data application to the U.S. GNP data is also reported. Detection and estimation of multiple change points in the long memory parameter is also investigated. The reversible jump MCMC is used for posterior inference. Performances are evaluated on simulated data and on the Nile River dataset.
12
Dethier, Sandra (Sandra Maria Dina Renée). "Long distance sprouting in the goldfish." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65507.
Full text
13
Mutombo, Franck Kalala. "Long-range interactions in complex networks." Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=18021.
Full textAbstract:
An interaction in a complex network is any kind of information or process that can propagate between network units or components along network links. Complex networks, which represent the structural skeleton of our societal, technological and infrastructural systems, play a major role in the propagation of processes. These processes include for example the case of epidemic spreading, the diffusion process, synchronisation, the consensus process and many others. It is usually assumed that interactions in networks propagate only from a node to its nearest neighbours. This thesis is about interactions that can be transmitted from a node to others that are not directly connected to it. These types of interactions are here called long-range interactions (LRI). The thesis is about those long-range interactions in complex networks. We will focus on the case of infection or epidemic spreading in complex networks. An "infection", understood here in a very broad sense, can be propagated through the network of social contacts among individuals. These social contacts include both "close" contacts and "casual" encounters among individuals in transport, leisure, shopping, etc. Knowing the first through the study of the social networks is not a difficult task, but having a clear picture of the network of casual contacts is a very hard problem in a society of increasing mobility. Here we assume, on the basis of several pieces of empirical evidence, that the casual contacts between two individuals are a function of their social distance in the network of close contacts. Then, we assume that we know the network of close contacts and infer the casual encounters by means of nonrandom long-range (LR) interactions determined by the social proximity of the two individuals. This approach is then implemented in a susceptible-infected-susceptible (SIS) model accounting for the spread of infections in complex networ ks. A parameter called "conductance" controls the feasibility of those casual encounters. In a zero conductance network only contagion through close contacts is allowed. As the conductance increases the probability of having casual encounters also increases. We show here that as the conductance parameter increases, the rate of propagation increases dramatically and the infection is less likely to die out. This increment is particularly marked in networks with scale-free degree distributions, where infections easily become epidemics. We show that the epidemic threshold of the model is given by the inverse of the largest eigenvalue of the generalised graph matrix that represents all the social contacts in the network. We point out that, from a Statistical Mechanical point of view, the epidemic threshold is also seen as the negative of the inverse of the free energy of the network when the system is frozen at extremely low temperatures. The proposed model is able to reproduce the age-assortativity or homophily observed in many social networks. Our model provides a general framework for studying epidemic spreading in networks with arbitrary topology with and without casual contacts accounted for by means of LR interactions.
14
Mongin, Emmanuel. "An evolutionary approach to long-range regulation." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=92333.
Full textAbstract:
Long-range regulatory regions play important functions in the regulation of transcription and are particularly involved in the precise spatio-temporal expression of target genes. Such regions have specific characteristics, among which is their ability to regulate many target genes that can be located up to 1Mb from the transcription start site. The prediction and functional characterization of such regions remains an open problem. Evolutionary approaches have been developed to detect regulatory regions that are under purifying selection. However, little has been done with regards to the impact of long-range regulation on genome evolution.This thesis focuses on three different aspects of long-range regulation: i/ First we develop a method that predicts regions particularly prone to the fixation of evolutionary breakpoints. We discuss the results obtained in the context of long-range regulation and show that this type of regulation is a major factor shaping vertebrate genomes in evolution. ii/ The second project aims at predicting functional interactions between regulatory regions and target genes based on the observation of evolutionary rearrangements in various vertebrate species. We show how this approach produces a biologically meaningful prediction dataset that will be useful to researchers working on regulation. iii/ Third, we focus on the in vivo characterization of regulatory regions. We present a powerful and reliable enhancer detection pipeline composed of an in silico approach to predict putative enhancers and an in vivo method to functionally characterize the expression specificity of predicted regions in the developing medaka fish.
The results presented in this thesis contribute to different areas of research such as a better understanding of evolutionary dynamics related to evolutionary rearrangements and to a better in silico and in vivo characterization of cis-regulatory regions.
La régulation longue distance a d'importantes fonctions dans la régulation de la transcription et est particulièrement impliquée dans la régulation spatiale et temporelle des gènes cibles. Ces régions ont des caractèristiques spécifiques telles que la capacité de contrôler different gènes à des distances jusqu'a 1Mb du site d'initiation de la transcription. La prédiction et la caractérisation fonctionelle de ces regions restent un problème d'actualité. Des approches évolutionaires ont été d´eveloppées pour détecter les régions sous pression de sélection. En revanche, peu a été fait en rapport avec l'impact de la régulation de longue distance sur l'évolution du génome.
Cette thèse se concentre sur trois differents aspects de la régulation longue distance: i/ Premièrement, nous developpons une méthode de prédiction des regions particulièrement sujettes à la fixation des réarrangements de l'évolution. Nous étudions les résultats obtenus dans le contexte de la régulation longue distance et nous montrons que ce type de régulation est un composant majeur dans le façonnement du génome au cours de l'évolution. ii/ Le second projet à pour but de prédire les interactions fonctionnelles entre les régions de régulation et leur gènes cible à partir de l'observation de réarrangements de l'évolution dans differentes espèces. Nous montrons comment une telle approche produit des resultants biologiquement significatifs qui seront particulièrement utiles aux chercheurs travaillant dans le domaine de la régulation. iii/ Troisièmement, nous nous concentrons sur la caractérisation fonctionnelle in vivo des regions régulatrices. Nous présentons une méthode fiable de détection des enhancers composée d'une approche informatique pour la prédiction de ces régions et d'une approche biologique pour caractériser fonctionnellement les spécificités d'expression de ces régions dans le poisson medaka.
Les résultats présentés dans cette thèse contribuent à une meilleure comprehension des dynamiques d'évolution en relation avec la régulation longue distance et une meilleure prédiction et caractérisation fonctionnelle de ces régions régulatrices.
15
Siegal, Marilyn G. "Exploratory study of the long-term unattached." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74352.
Full textAbstract:
This exploratory study was designed to identify a range of variables distinguishing long-term unattached (LTU) from long-term committed (LTC) adults between the ages of 30 and 50. Specifically, it attempted to identify explanations for, and consequences of, long-term unattachment.LTU subjects selected were those who had not been in a committed, intimate relationship for eight or more years; LTC subjects selected were those who had been in a marital, or equivalent, relationship for eight or more years.
The study was done in two parts. The preliminary study was qualitative and consisted of interviews of 14 subjects--seven LTUs and seven LTCs. LTU and LTC subjects were closely matched on demographic and socioeconomic variables. Emerging themes were added to the range of ideas from the review of literature. A questionnaire was developed from the comprehensive list of ideas.
The final study was quantitative; 77 subjects were administered the questionnaire designed for the study, as well as the Millon Clinical Multiaxial Inventory (MCMI). LTUs' responses to the questionnaire and scores on the MCMI were compared with those of LTC subjects. All variables were subjected to discriminant function analysis, and univariate analysis.
The results showed that: (a) LTUs came from families characterized by significant separations and losses, distant relationships with parents, and little communication within the family; (b) LTUs felt significantly more alienated from others as children and adults than LTCs; (c) LTUs were significantly higher than LTCs on MCMI scales schizoid, avoidant, passive-aggressive, schizotypal, and borderline, i.e., scales of personalities characterized by problems with intimate, committed relationships; (d) LTUs were not significantly more influenced than LTCs by sociocultural changes such as the human potential movement, the women's liberation movement, and the emphasis on romance in our culture; and (e) LTUs suffered significantly more than LTCs from despair and lack of meaning in their lives, and lacked satisfying ways of meeting others with whom they would like to be involved. Implications, limitations of the study, and suggestions for future research are proffered.
16
Dragomir, Diana. "Characterising the orbits of long period exoplanets." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21929.
Full textAbstract:
To date nearly 300 exoplanets have been discovered, most of them through measurements of the wobble induced by the planet in the motion of its host star. We have developed a program, based on Bayesian inference, to fit eccentric Keplerian orbits to exoplanet radial velocity data. The data consist of optical spectra obtained using the HIRES echelle spectrometer on the Keck I telescope. We have applied the program to 58 sets of measurements. We have obtained probability distributions for the orbital period and eccentricity for each set. We have found that clear upper and lower limits can be placed on the period while the eccentricity proves more difficult to constrain. From the average period probability distribution we prepared, we preliminarily concluded that there is a much higher probability to find exoplanets with periods below 10000 days than with periods above 10000 days. We also suspect the existence of a correlation between the period and the eccentricity, as well as that of a possible trend of decreasing period with increasing stellar metallicity.À date presque 300 exoplanètes ont été découvertes, la plupart à travers des mesures du vacillement provoqué par la planète dans le mouvement de son étoile mère. Nous avons mis au point un programme, basé sur l'inférence bayésienne, pour modéliser des données de vélocité radiale pour la recherche d'exoplanètes par des orbites excentriques képlériennes. Les données sont des spectres optiques et ont été recueillies avec le spectromètre échelle HIRES au télescope Keck I. Nous avons utilisé le programme pour analyser 58 ensembles de données. Nous avons obtenu des distributions de probabilité pour la période orbitale ainsi que pour l'excentricité pour chaque ensemble. Nous avons trouvé qu'il est possible de placer des limites supérieures et inférieures sur la période, mais que l'excentricité est plus difficile à contraindre. À partir de la moyenne des distributions de probabilité que nous avons obtenu pour la période, nous avons préliminairement conclu qu'il y a une beaucoup plus grande probabilité de trouver des exoplanètes avec des périodes inférieures à 10000 jours qu'avec des périodes supérieures à 10000 jours. Nous suspectons la présence d'une corrélation entre la période et l'excentricité, ainsi qu'une possible tendance de la période à décroître à mesure que la métallicité stellaire augmente.
17
McIntosh, Matthew. "Long-term cardiovascular adaptations to neonatal hypoxia." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110447.
Full textAbstract:
INTRODUCTION: Previous work from the Rohlicek laboratory has shown that neonatal hypoxia is associated with an increase in systolic blood pressure in two month old male rats. We have asked here whether this increase persists into later maturity, and if it is also present in females. We have further examined separately whether sex hormones or alterations in autonomic control are implicated in this increase. METHODS: Experiments were conducted on adult Sprague Dawley rats of both sexes. An experimental group was raised in hypoxia (FiO2 = 0.12) for the first ten days of life and subsequently raised in normoxia. A second group was reared entirely in normoxia. A subset of males and females were gonadectomized one month prior to recording. At two, three, and six months the rats were instrumented with an intravascular telemetric blood pressure transmitter monitoring abdominal aortic pressure. One week later arterial pressure was recorded for 24 hours in the ambulatory, unrestrained rats. RESULTS: Systolic pressure was significantly higher in neonatally hypoxic male rats at every age during their active (night-time) period and as well at 3 and 6 months during the resting (daytime) period compared to controls. The effect size of neonatal hypoxia increased with age, although this increase did not achieve significance. Neonatally hypoxic females did not show any differences in systemic pressure compared to controls. Castration did not prevent the development of elevated blood pressure in two month neonatally hypoxic males, nor did ovariectomy unveil any differences between neonatally hypoxic and control females at three months of age. In two month male rats hypoxic neonatally, baroreflex sensitivity was significantly decreased during their active (night-time) period. CONCLUSIONS: Our results indicate that the increase in blood pressure experienced by neonatally hypoxic adult male rats persists into later maturity. This effect appears to be sex specific to male animals. The finding of decreased baroreflex sensitivity following neonatal hypoxia at two months indicates that altered autonomic tone with a relative increase in sympathetic activity plays a role in the increase in arterial pressure.INTRODUCTION: Des travaux antérieurs entrepris au laboratoire Rohlicek ont montré que l'hypoxie néonatale est associée à une élévation de la pression artérielle systolique chez les rats mâles âgés de deux mois. Dans le cadre de la présente étude, on demande si cette élévation persiste plus tard dans la maturité et si elle est également présente chez les femelles. On essaye en outre de déterminer si les hormones sexuelles ou des altérations dans le contrôle autonome jouent un rôle dans cette élévation. MÉTHODE: Des études ont été menées sur des rats adultes Sprague-Dawley des deux sexes. Un groupe expérimental a été élevé en hypoxie (FiO2 = 0,12) durant les dix premiers jours de vie et subséquemment en normaxie. Un second groupe a été élevé entièrement en normaxie. Un sous-ensemble de mâles et de femelles ont été gonadectomisés un mois avant la prise de mesures. À deux, trois et six mois, des rats étaient branchés à un transducteur de pression artérielle intravasculaire avec télémétrie pour surveillance de la pression de l'aorte abdominale. Une semaine plus tard, la pression artérielle a été mesurée durant 24 heures chez des rats ambulatoires et non contenus. RÉSULTATS: La pression systolique a été considérablement plus élevée chez des rats mâles en hypoxie à tout âge durant leur période active (nocturne) et également à 3 et 6 mois durant la période de repos (diurne) par comparaison aux rats du groupe témoin. L'ampleur de l'effet de l'hypoxie néonatale s'est accrue avec l'âge, bien que cette augmentation n'ait pas été statistiquement significative. Les femelles en hypoxie néonatale n'ont montré aucune différence dans la pression artérielle générale par comparaison aux femelles du groupe témoin. Tout comme la castration n'a pu empêcher l'apparition d'une pression artérielle élevée chez les mâles en hypoxie néonatale âgés de deux mois, l'ovariectomie de même n'a pu montrer une quelconque différence entre les femelles en hypoxie néonatale par opposition aux femelles du groupe témoin à l'âge de trois mois. Chez les rats mâles âgés de deux mois en hypoxie néonatale, la sensibilité du baroréflexe a été considérablement atrophiée durant leur période active (nocturne). CONCLUSION: Nos résultats indiquent que l'élévation de la pression artérielle chez les rats mâles adultes en hypoxie néonatale persiste plus tard dans la maturité. Cet effet semble être spécifique selon le sexe chez les animaux mâles. La découverte de la sensibilité du baroréflexe atrophiée à la suite de l'hypoxie néonatale à deux mois indique que le tonus autonome altéré, conjugué à une augmentation relative de l'activité sympathique, jouent un rôle dans l'élévation de la pression artérielle.
18
Li, Pei 1981. "Controlling hour-long power of wind farms." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112574.
Full textAbstract:
In attempting to control the power output of a wind farm, it is first necessary to smooth the power fluctuations due to wind turbulence. This is accomplished by spatial smoothing, whereby the high frequency power components of a single wind turbine generator (WTG) is reduced by a factor of N-1/2, where N is the number of WTGs in the farm. For this reason the first part of the thesis is concerned with developing a model of smoothing in a wind farm and justifying it mathematically.After spatial smoothing, the wind farm output still contains low frequency fluctuations. The second part of the thesis makes use of a combination of: (i) pitch angle control of the turbine blades, (ii) power electronic control of the generators, (iii) spatial filtering and (iv) negative feedback control to remove the low frequency fluctuations. The wind farm output then has the quality to be sold as regulated power which fetches a better economic return than when sold as energy. This, of course, presumes that 1-hour ahead prediction of wind velocity at 1-hour long low variance is available.
The thesis also considers the case when the conditions for regulated power are not predicted. In this situation, the wind farm may opt to use the tracking mode which tracks the slowly time varying non-turbulent wind power. The thesis examines the possibility of diverting some of the wind farm power to implement dynamic performance enhancement strategies, for system damping for example.
The controllability of the wind farm is demonstrated by simulations of a wind farm made up of 24 wind turbine-generators (WTGs) using 1-hour long wind velocity data.
19
Kavanaugh, Ashley A. "Longitudinal Changes in Strength and Explosive Performance Characteristics in NCAA Division I Women’s Volleyball Athletes." Digital Commons @ East Tennessee State University, 2014. https://dc.etsu.edu/etd/2315.
Full textAbstract:
The purpose of this dissertation was to determine if a periodized strength and conditioning program resulted in long-term adaptations in NCAA Division I women’s volleyball athletes, and if these changes related to the team’s competitive performance. Specifically, this dissertation serves to: 1.) describe the changes in body composition and performance variables of 2 female volleyball athletes over a 4-year collegiate career, 2.) determine the degree and magnitude of change in performance variables after about 1, 2, and 3 years of periodized resistance training, and 3.) infer if volleyball performance characteristics are related to a team’s competitive success. The following are major findings of this dissertation. 1.) Positive changes in vertical jump height, strength, and explosiveness may be possible throughout 4 years of collegiate volleyball training even with increased body mass and percent body fat. Moreover, impaired ability to perform heavy lower-body resistance training exercises due to chronic injury negatively impacts long-term physical performance adaptations over 4 years. 2.) A combination of traditional resistance training exercises and weightlifting variations at various loads, in addition to volleyball practice, appear to be effective at increasing maximal strength by 44% and vertical jump height by 20%-30% in NCAA Division I women’s volleyball athletes after about two and half years of training. Furthermore, these characteristics can be improved in the absence of additional plyometric training outside of normal volleyball-specific practice. 3.) A rating percentage index RPI ranking ratio and unweighted match score ratio appear to be better predictors of overall team competitive season success than a weighted match score ratio. On the contrary, a weighted match score ratio may be better for determining an association between team match performance and volleyball-specific fitness. A considerable amount of research is needed to develop a volleyball-specific performance index that best quantifies team performance and whether or not a measurable association exists between improved fitness characteristics and increased overall team competitive success. The findings of this dissertation provide evidence that analyzing and monitoring volleyball-related performance variables over time can assist the sport performance group in making training based decisions as well as promote the successful development of an athlete.
20
Livingstone, Margaret Anne. "Long-term timing of two young, energetic pulsars." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84054.
Full textAbstract:
We report on the long-term phase-coherent timing of two young, energetic pulsars, PSR B1509-58 and PSR B0540-69, using data from the Rossi X-ray Timing Explorer, the Parkes Radio Telescope and the Molonglo Observatory Synthesis Telescope. We present fully phase-coherent timing analyses of both sources, and show that contamination from timing noise can significantly affect measured timing parameters. As a result, we also present, a partially phase-coherent timing analysis which is less sensitive to timing noise.We present an updated measurement of n = 2.839 +/- 0.003 for PSR B1509-58, and we report a measurement of the second braking index, m = 18.3 +/- 2.9, in agreement with the prediction from the simple model of pulsar spin-down. We also examine changes in dispersion measure and present an analysis of the noise, measuring a low-resolution power spectrum corresponding to a spectral index of beta = -4.6 +/- 1.0. This implies that the noise cannot be explained by a pure random walk. We also show that no glitches have occurred in 21.3 yr, implying that this pulsar glitches less often than typical young pulsars.
We measure the braking index for PSR B0540-69, n = 2.140 +/- 0.009 and discuss our measurement in the context of other discordant values reported in the literature. In addition, we detect evidence for a glitch which has been previously reported but later disputed. The glitch occurred at MJD 51335 +/- 12 with Deltanu/nu = (1.4 +/- 0.2) x 10-9 and Delta n&d2;/n&d2; = (1.33 +/- 0.02) x 10-4. We present an improved source position from the phase-coherent timing of this pulsar, to our knowledge, the first of its kind from X-ray pulsar timing.
We discuss the physical implications of n < 3, the value predicted from the model of pulsar spin down. In addition, we discuss possible causes of timing noise in these two young pulsars. We also discuss the anomalously small glitch activity in very young pulsars which suggests that neutron stars of similar apparent ages, rotation properties and inferred dipolar B fields can have significantly different internal properties.
21
Keshavjee, Nashira. "Matthew Arnold's five long poems : a dialectical reading." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56918.
Full textAbstract:
Matthew Arnold's five long poems were published between 1852 and 1867. In these poems (Empedocles on Etna, Tristram and Iseult, Sohrab and Rustum, Balder Dead and Merope) Arnold tries to analyze a number of themes, like nature, moral values, poetics, and the place of authority in society. His analysis is dialectical, and one notices great distress and an inability to resolve these issues. This thesis examines Arnold's confusion, as well as his eventual calm acceptance of life in all its contradictions. It concludes subsequently that Arnold has a genuine desire to find personal dialectical syntheses where possible.
22
Liu, Nannan 1973. "Molecular weight distribution of long chain branched polyethylene." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79248.
Full textAbstract:
To fully understand the properties of Long Chain Branched Metallocene Polyethylene (LCB mPE), we need to understand its molecular structure and Molecular Weight Distribution (MWD). Gel Permeation Chromatography (GPC) is the most important and widely applied technique to measure the MWD. In this analytical technique, polymer molecules are fractionated by their hydrodynamic volume (i.e. the sizes of polymer molecules in dilute solution). This work is focused on the simulation of GPC for the MWD of LCB mPE.The polymerization reaction mechanism of LCB mPE provides a method to simulate the generation of LCB mPE molecules thus allowing the development of a statistical model of the structure and molecular weight distribution of LCB mPE by previous researchers. This statistical model gives a theoretical MWD. In this work after simulating the generation of one million LCB mPE molecules, we calculate the sizes (i.e. radii of gyration) of molecules at both theta and good solvent conditions to obtain the molecular size distributions. Then we simulate the fractionation in GPC and the different GPC detector responses to obtain simulated GPC MWDs. The simulated MWDs are compared to real GPC results provided by the Dow Chemical Company. We analyze the performance of GPC for long chain branched polyethylene and relate the results to the theoretical MWD.
23
Tansel, Rifat Baran. "Effects Of 5 Week Nordic Hamstring Strength Training On 10-12 Years Old Male Basketball Players." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607913/index.pdf.
Full textAbstract:
The purpose of this study was to investigate the effects of Nordic hamstring strength training (NHST) program on (1) leg power, (2) vertical jump, (3) and knee proprioception measurements of 10-12 years old male basketball players. Nordic Hamstring Strength Training (NHST) group (N=16), participated in basketball training plus in Nordic hamstring strength training, while the control group (N=11) participated in basketball training only. Subjects were tested before and after 5-week training program for, vertical jump, isokinetic leg strength and knee proprioception. Each subject who agreed to participate in this investigation signed a consent form along their parent. Pre and post test differences between experimental and control group was investigated by MANOVA and paired sample t-test was used to evaluate the differences between pre and post tests of both groups. There was no significant difference in pre and post test results of NHST and control group.
There were statistically significant increase in concentric quadriceps and hamstring strength, eccentric quadriceps strength, conventional H:Q strength ratio, and vertical jumping measurements in experimental group between the pre and post tests.
It can be concluded that NHST program combine with basketball training has beneficial effects on the leg strength and H:Q strength ratio. These findings also suggest that hamstring exercise may be beneficial or helpful for preventing the hamstring injury occurrence and improving the physical performances such as jumping ability.
24
Smith, M. Alexander. "Spatial ecology of Bufo fowleri." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84844.
Full textAbstract:
The geographic isolation of populations can result in a metapopulation effect where regional dynamics of extinction and colonization are more important to population viability than local dynamics of individuals' birth or death. When this partial isolation is maintained for many generations genetic variability can be geographically structured. Populations of temperate-zone anuran amphibians are often considered to be geographically isolated on relatively small spatial scales due to the animals presumed high site fidelity and strict dependence on moisture for respiration and breeding. As a result, temperate, pond-breeding anuran amphibian populations are considered likely candidates to test hypotheses of metapopulation theory, movement and phylogeography. Using data from the Fowler's toad, (Bufo fowleri) I test the applicability of metapopulation theory, the likelihood of limited movement and the strength of phylogeographic structure. Specifically, I show that the generalization of the amphibians-as-metapopulations paradigm, due to their limited dispersal capabilities, is not supported (I). Bufo fowleri movement is well described by an inverse power function. Whereas most individuals do not move, some move long distances. There is no sex bias to this movement and I propose the hypothesis that the animals moving the longest distances are aided by the passive action of lake currents (II). B. fowleri juveniles are not a dispersal stage. They move neither farther nor faster than adults. The observation of predominantly juvenile contribution to a dispersal pool is due to their abundance---there are simply many more juveniles than adults (III). My observations of amphibian population turnover do not support the predictions of two specific metapopulation models when parameterized on a local (<10km) or regional scale (~300km) (IV). B. fowleri populations in Canada exhibit both shallow and deep phylogeographic structure. The shallow divisions are geo
25
Bouchard, David-Etienne. "Long-distance degree quantification and the grammar of subjectivity." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114332.
Full textAbstract:
This thesis is concerned with two little known constructions at the syntax-semantics interface, namely a type of apparent long-distance degree quantification in Québec French called Intensification At a Distance (IAD), and a class of verbs that I simply refer to as opinion verbs and which include English to find and French trouver, for example.I examine two competing analyses of IAD, namely one where the surface word order is derived by overt DegP movement and one where it is base-generated. The former approach is a natural extension of the view in degree semantics that degree operators need a QR-type of operation to be interpretable. If it is right, then nothing needs to be added to the semantic component, and IAD can be treated as a distributional argument in favour of this semantics. Furthermore, it can be used to examine various proposals in this field, since if this hypothesis is right, then we can read the scope of degree operators right off surface syntax in this dialect.While this hypothesis is very successful at providing an interpretation to IAD sentences, it makes a number of incorrect syntactic predictions. I thus turn to an in situ analysis of IAD, which shares almost none of the syntactic problems of the movement analysis, but requires an entirely novel semantics to be interpretable. I thus suggest an interpretive mechanism for IAD sentences whereby the degree operator does not relate to any gradable predicate lower in the structure, but rather quantifies over degrees of appropriateness of its entire complement, in a manner very similar to how Morzycki (2011) analyses metalinguistic comparatives. The scale of the lower gradable adjective only comes to play a role in the pragmatics. I tentatively conclude in favour of the in situ analysis.Concerning opinion verbs, I present some novel data that show that sentences in find contain much semantic material that is presupposed, and I propose to formalize this in the form of what I call the Subjective Contingency Presupposition. This approach gives us an adequate way of describing what is asserted and what is presupposed in such sentences, including in many problematic cases involving negation, and also gives us for free the fact that such verbs can only take subjective complements.I also suggest that a careful examination of the syntactic and semantic properties of their complement clause argues in favour of Lasersohn (2005)'s proposal that subjectivity in grammar is represented by a judge index on the interpretation function, rather than by null pronouns in the syntax. This is exactly contrary to Saebø (2009)'s conclusions, who recently proposed one of the first analyses of the verb find. This conclusion follows from the way that various kinds of subjective and non-subjective constituents may be conjoined under find.Cette thèse examine deux constructions peu connues à l'interface de la syntaxe et la sémantique, notamment un type de quantification de degrés à distance en français québécois appelé l'Intensification À Distance (IAD), ainsi que la classe des verbes d'opinion, tels que trouver et to find en anglais. J'examine deux analyses potentiels de l'IAD: une selon laquelle l'ordre des mots est dérivé par une version visible du mouvement de DegP et une où l'ordre de surface est généré tel quel. La première analyse est naturellement rattachée à l'approche dans la sémantique de degrés selon laquelle les opérateurs de degré nécessitent une opération semblable à la montée des quantificateurs pour être interprétables. Si cela est correct, il n'est pas nécessaire de modifier la sémantique que nous donnons à ces éléments et l'IAD peut être considérée comme un argument distributionnel en faveur de cette sémantique. De plus, l'IAD peut ainsi servir à vérifier plusieurs hypothèses dans ce domaine, puisque si cette analyse est valide, il est possible d'évaluer la portée des opérateurs de degré à même la syntaxe de surface dans ce dialecte.Malgré que cette analyse arrive à fournir une interprétation aux phrases à IAD, elle fait plusieurs prédictions incorrectes sur le plan syntaxique. J'examinerai ainsi une analyse in situ de l'IAD, ce qui permet d'éviter un grand nombre des problèmes de l'analyse par mouvement, mais nécessite toutefois une sémantique entièrement nouvelle.Je proposerai donc un nouveau système d'interprétation pour les phrases à IAD selon lequel l'opérateur de degré n'a aucune relation directe avec un prédicat scalaire plus bas dans la phrase, mais quantifie plutôt sur les degrés d'adéquation de son complément entier. Cette analyse et largement inspirée de celle de Morzycki (2011) des comparatifs métalinguistiques. L'échelle introduite par le prédicat scalaire ne devient pertinente pour l'interprétation de l'opérateur qu'au niveau de la pragmatique. Je conclus provisoirement en faveur de l'analyse in situ.En ce qui concerne les verbes d'opinion, je présente de nouvelles données démontrant que les phrases construites avec find contiennent beaucoup d'information présupposée. Je formalise cette information à l'aide de ce que j'appelle la Présupposition de Contingence Subjective. Cette formulation rend compte de ce que ces phrases affirment et présupposent de manière adéquate, incluant dans de nombreux cas impliquant des négations enchâssées. Le fait que les verbes d'opinion n'admettent que des compléments subjectifs est aussi expliquée par cette formulation.De plus, je suggère qu'une analyse attentive des propriétés syntaxiques et sémantiques des compléments des verbes d'opinion tend à confirmer l'analyse de Lasersohn (2005) selon laquelle la subjectivité est représentée dans la grammaire à l'aide d'un indice sur la fonction d'interprétation plutôt que par des pronoms nuls dans la syntaxe, un résultat directement opposé à celui de Saebø (2009), qui a récemment proposé une des premières analyse des verbes d'opinion. Cela est justifié par les possibilités de conjonction de divers types de prédicats subjectifs et non-subjectifs à l'intérieur du complément de find.
26
Pettersson, Robert. "Simulation of Human Movements through Optimization." Doctoral thesis, KTH, Strukturmekanik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102158.
Full textAbstract:
Optimization has been used to simulate human neural control and resulting movement patterns. The short term aim was to develop the methodology required for solving the movement optimization problem often arising when modelling human movements. A long term aim is the contribution to increased knowledge about various human movements, wherein postures is one specific case. Simulation tools can give valuable information to improve orthopeadic treatments and technique for training and performance in sports. In one study a static 3D model with 30 muscle groups was used to analyse postures. The activation levels of these muscles are minimized in order to represent the individual’s choice of posture. Subject specific data in terms of anthropometry, strength and orthopedic aids serve as input. The specific aim of this part was to study effects from orthopedic treatment and altered abilities of the subject. Initial validation shows qualitative agreement of posture strategies but further details about passive stiffness and anthropometry are needed, especially to predict pelvis orientation. Four studies dealt with movement optimization. The main methodological advance was to introduce contact constraints to the movement optimization. A freetime multiple phase formulation was derived to be able to analyse movements where different constraints and degrees of freedom are present in subsequent phases of the movements. The athletic long jump, a two foot high jump, a backward somersault and rowing were used as applications with their different need of formulation. Maximum performance as well as least effort cost functions have been explored. Even though it has been a secondary aim in this work the results show reasonable agreement to expected movements in reality. Case specific subject properties and inclusion of muscle dynamics are required to draw conclusions about improvements in the sport activity, respectively.QC 20120910
27
Weatherill, Daniel Brian. "Characterization of translational regulation during long-term facilitation in «Aplysia»." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=96807.
Full textAbstract:
It is well established that the new macromolecular synthesis required for both long-term synaptic plasticity and long-term memory involves not only transcriptional regulation but translational regulation as well. Target of rapamycin (TOR) complex 1 (TORC1), a key regulator of translation, has been implicated in numerous forms of long-term synaptic plasticity and memory. A powerful model system for studying the changes underlying memory formation is synaptic facilitation at sensory-to-motor neuron synapses in the sea slug, Aplysia, as both short- and long-term forms of this type of synaptic plasticity have been shown to contribute to short- and long-term memory, respectively, for behavioural sensitization of the gill-/siphon-withdrawal reflex. Here, we have begun to characterize the nature of the signalling pathways through which translation is regulated during long-term facilitation (LTF). In one study, we expressed dominant negative forms of the two known immediate downstream effectors of TORC1: eukaryotic initiation factor 4E (eIF4E) binding protein (4E-BP) and ribosomal protein S6 kinase (S6K), and examined the effects of specifically disrupting each pathway on a phase of LTF known to require TORC1 signalling, 24-hr LTF. A translational reporter construct was also used to examine the effects of the two dominant negatives on TORC1-mediated stimulation of general translation. 24-hr LTF was found to require S6K, but not 4E-BP, signalling. As neither dominant negative construct blocked TORC1-mediated increases in general translation, the requirement for S6K signalling during 24-hr LTF likely reflects a requirement for translational upregulation of a specific transcript or subset of transcripts, not reported by the general translational reporter construct. This study has begun to narrow down the TORC1 pathways involved in LTF, specifically, which will help identify the transcripts whose translational upregulation is required for this form of long-term synaptic plasticity and will shed light on the important processes engaged by TORC1 during memory formation, in general.In a second study, we sought to further hone in on the requisite TORC1 signalling pathways during 24-hr LTF by first characterizing TORC1-mediated regulation of eukaryotic elongation factor 2 (eEF2), one of the downstream effectors of S6K in other systems. To this end, using an antibody that specifically recognizes eEF2 kinase (eEF2K) phosphorylated at a putative S6K phosphorylation site, we first demonstrate that in Aplysia, as in other systems, S6K mediates phosphorylation of eEF2K. Expression of a mutant form of eEF2K that cannot be phosphorylated at this site blocked a serotonin- (a.k.a. 5-hydroxytryptamine- (5-HT-)) induced decrease in eEF2 phosphorylation in isolated neurites, indicating that the effect of S6K on eEF2 phosphorylation is also conserved. Surprisingly, within the sensory neuron (SN) soma, 5-HT treatment resulted in a decrease in eEF2K phosphorylation at the S6K site and a concomitant increase in eEF2 phosphorylation, indicating that 5-HT engages a second parallel pathway that opposes the effects of S6K activation. Finally, overexpression of eEF2K caused a similar increase in eEF2 phosphorylation and resulted in a specific increase in translation of a reporter of general translation in the face of inhibited internal-ribosome-entry-site- (IRES-) dependent translation. This last result extends, to invertebrates, the previous, seemingly paradoxical, finding that inhibition of translational elongation can stimulate the translation of certain transcripts. As this novel mechanism of translational regulation has been implicated in mammalian forms of long-term synaptic plasticity, 5-HT-induced somatic decreases in eEF2K phosphorylation and subsequent increases in eEF2 phosphorylation may engage a mechanism of translational regulation fundamental to the establishment of long-term memory.La facilitation synaptique au niveau des synapses sensori-motrices de la limace marine l'Aplysie représente un excellent modèle pour étudier les changements moléculaires sous-jacents à la formation de la mémoire. En effet, dans ce système, la plasticité synaptique à court terme ou à long terme est sous-jacente à la formation d'une mémoire à court terme ou à long terme, respectivement, de la sensibilisation du réflexe de retrait de la branchie de l'animal. Dans cette thèse, nous avons examiné les voies de signalisation qui régulent la traduction de protéines pendant la facilitation à long terme (LTF). En premier lieu, nous avons exprimé dans les neurones des dominants négatifs de deux protéines effectrices immédiates en aval de TORC1, soit la protéine de liaison à l'eIF4E (4E-BP) et la protéine kinase ribosomale S6 (S6K). Ceci nous a permis d'examiner l'effet de l'altération de ces voies de signalisation sur une phase de LTF médiée par TORC1, la LTF de 24 heures. Nous avons aussi utilisé un construct reporter de la traduction pour étudier les effets de l'expression des dominants négatifs sur la stimulation de traduction générale médiée par TORC1. Nos résultats démontrent que la LTF de 24 heures nécessite la voie de signalisation de la S6K mais pas celle de du 4E-BP. Par contre, les dominants négatifs n'ont pas bloqué l'augmentation de la traduction médiée par TORC1 suggérant que la S6K pourrait être importante pour augmenter la traduction d'un transcrit en particulier ou d'un sous-groupe de transcrits, non-signalée par le construct reporter de la traduction générale. Cette étude nous a permis de mieux définir les voies de TORC1 qui sont impliquées dans la LTF. Ces résultats contribueront à l'identification de transcrits dont l'augmentation de la traduction est importante pour cette forme de plasticité synaptique à long terme ainsi qu'à l'élucidation de processus importants médiés par TORC1 pendant la formation de la mémoire de façon générale.En deuxième lieu, nous avons investigé les voies de signalisation de TORC1 pendant la LTF de 24 heures en caractérisant la régulation du facteur d'élongation 2 chez les eucaryotes (eEF2), un effecteur en aval de la S6K dans d'autres systèmes, par TORC1. Nous avons utilisé un anticorps qui reconnaît spécifiquement la kinase du eEF2 (eEF2K) lorsque phosphorylé à un site présumé de phosphorylation par la S6K. Nous avons démontré que chez l'Aplysie, comme dans d'autres systèmes, la S6K médie la phosphorylation de l' eEF2K. L'expression d'une forme mutante de l' eEF2K, qui ne peut être phosphorylée à ce site, a bloqué la diminution 5-HT-dépendante de la phosphorylation du eEF2 dans des neurites isolées, indiquant que l'effet de la S6K sur la phosphorylation du eEF2 est aussi conservé. De façon étonnante, le traitement avec la 5-HT dans le corps cellulaire a conduit à une diminution de la phosphorylation de la eEF2K au niveau du site S6K, en parallèle avec une augmentation de la phosphorylation du eEF2. Ces résultats suggèrent que la 5-HT induit une deuxième voie qui s'oppose aux effets de l'activation de la S6K. Finalement, la surexpression de l' eEF2K a conduit à une augmentation de la phosphorylation du eEF2 ainsi qu'une augmentation de la traduction du reporter de la traduction générale en présence d'une inhibition de la traduction IRES-dépendante. Ce résultat s'inscrit dans la conclusion précédente qui semble paradoxale chez les invertébrés qui dit que l'inhibition de l'élongation de la traduction peut stimuler la traduction de certains transcrits. Comme ce nouveau mécanisme de régulation de la traduction a déjà été impliqué dans la plasticité synaptique à long terme chez les mammifères, la diminution de la phosphorylation de l' eEF2K induite par la 5-HT dans le corps cellulaire et l'augmentation subséquente de la phosphorylation du eEF2 pourraient constituer un mécanisme de régulation de la traduction fondamental à l'établissement d'une mémoire à long terme.
28
Keightley, Keir. "The history and exegesis of pop : reading "All summer long"." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22458.
Full textAbstract:
The study of popular music has experienced an astonishing growth in the past two and a half decades; however, the detailed analysis of musical texts has lagged far behind other areas, such as the sociology of the youth audience and analysis of the visual components of music video. This thesis undertakes a survey of recent approaches to popular music at the textual level, before examining the construction of an individual song, the Beach Boys' 1964 recording of "All Summer Long". While many parameters affecting the creation of the cultural significance of the text in question are discussed, ultimately the exegesis serves to problematize larger issues in scholarly work on popular music, particularly the dominance of the paradigms of rupture, rebellion, and authenticity in relation to the historiography and criticism of the formation known as "rock".
29
Laradji, Mohamed. "First-order phase transitions in systems with long-ranged forces." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61937.
Full text
30
Saad, Maarouf. "Application of principal components analysis to long-term reservoir management." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75910.
Full textAbstract:
Determining the optimal long-term operating policy of a multi-reservoir power system requires solution of a stochastic nonlinear programming problem. For small systems, the solution can be found by dynamic programming, but for large systems no direct solution method exists yet, so that one must resort to mathematical manipulations to solve the problem. This thesis presents a very efficient procedure for the case where high correlation exists between the state variables. It consists in performing principal components analysis on the trajectories to find a reduced model of the system. The reduced model is then substituted into the operating problem and the resulting problem is solved by stochastic dynamic programming. The reservoir trajectories on which principal components analysis are performed can be obtained by solving the operating problem deterministically for a large number of equally likely flow sequences. The results of applying the manipulation to Quebec's La Grande river, which has four reservoirs, are reported. A comparison with the classical dynamic programming, that is without any reduction, is also studied and results are reported to show the efficiency of the principal components approach.
31
Wong, Andrew. "On the implementation of long LDPC codes for optical communications." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86788.
Full textAbstract:
Very powerful long low-density parity-check (LDPC) codes, such as the ITU G.975.1 Standard (32643, 30592) LDPC Code [1], have been considered for optical communications. Traditional implementations of such long codes result in circuits requiring millions of interconnections, which are not affordable. This thesis investigates the performance of the hard-decision differential decoding with binary message-passing (DD-BMP) algorithm [2], a low-complexity algorithm requiring a minimal number of wires due to its binary messages. Our simulation results for the ITU G.975.1 standard demonstrate that hard-decision DD-BMP algorithm outperforms the results provided in the standard, and that the gap between the decoding performance of hard-decision DD-BMP and hard-decision sum-product is small at high signal-to-noise ratios (SNR). We also present a novel design methodology for implementing a soft-decision decoder by exploiting the code's structure. An implementation-efficient architecture is presented using a partially-parallel adaptation of the min-sum algorithm known as the line-passing algorithm. The line-passing algorithm makes soft-decision decoding available while requiring a minimal number of interconnections, which is attractive for long-haul optical communication systems.Les télécommunications optiques ont souvent besoin de codes de correction longues et efficaces tel le standard LDPC du ITU G.975.1 (32643, 30592) [1]. Les réalisations traditionnelles de ce code exigent des millions de fils et ne sont pas économiques. Cette thèse présente l'étude du décodage de l'algorithme différentiel avec un passage de message binaire (DD-BMP) [2] avec décision-dur. Lorsqu'il s'agit d'un algorithme bas-complexité avec des messages binaire, un nombre minimal de fil est exigé. Nos résultats de simulations pour ce code montre que le DD-BMP avec décision-dur a une meilleure exécution que celui du standard, et que la différence entre le DD-BMP avec décision-dur et l'agorithme sum-product (SP) avec décision-dur est petite aux rapports de signal-bruit (SNR) élevés. Cette thèse présente aussi une méthodologie originale pour la réalisation d'un algorithme de décodage avec décision-doux en exploitant leur structure. Une architecture d'exécution-efficient est présentée utilisant une approche partiel-parallèle avec l'agorithme line-passing, une modification de l'agorithme min-sum (MS). Cette architecture permet à l'information de doux-décision d'être employée tout en exigeant un nombre minimal de fils qui serait intéressante pour des systèmes de télécommunication optique de long-courrier.
32
Wang, Yintian 1976. "Three essays on volatility long memory and European option valuation." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102851.
Full textAbstract:
This dissertation is in the form of three essays on the topic of component and long memory GARCH models. The unifying feature of the thesis is the focus on investigating European index option evaluation using these models.The first essay presents a new model for the valuation of European options. In this model, the volatility of returns consists of two components. One of these components is a long-run component that can be modeled as fully persistent. The other component is short-run and has zero mean. The model can be viewed as an affine version of Engle and Lee (1999), allowing for easy valuation of European options. The model substantially outperforms a benchmark single-component volatility model that is well established in the literature. It also fits options better than a model that combines conditional heteroskedasticity and Poisson normal jumps. While the improvement in the component model's performance is partly due to its improved ability to capture the structure of the smirk and the path of spot volatility, its most distinctive feature is its ability to model the term structure. This feature enables the component model to jointly model long-maturity and short-maturity options.
The second essay derives two new GARCH variance component models with non-normal innovations. One of these models has an affine structure and leads to a closed-form option valuation formula. The other model has a non-affine structure and hence, option valuation is carried out using Monte Carlo simulation. We provide an empirical comparison of these two new component models and the respective special cases with normal innovations. We also compare the four component models against GARCH(1,1) models which they nest. All eight models are estimated using MLE on S&P500 returns. The likelihood criterion strongly favors the component models as well as non-normal innovations. The properties of the non-affine models differ significantly from those of the affine models. Evaluating the performance of component variance specifications for option valuation using parameter estimates from returns data also provides strong support for component models. However, support for non-normal innovations and non-affine structure is less convincing for option valuation.
The third essay aims to investigate the impact of long memory in volatility on European option valuation. We mainly compare two groups of GARCH models that allow for long memory in volatility. They are the component Heston-Nandi GARCH model developed in the first essay, in which the volatility of returns consists of a long-run and a short-run component, and a fractionally integrated Heston-Nandi GARCH (FIHNGARCH) model based on Bollerslev and Mikkelsen (1999). We investigate the performance of the models using S&P500 index returns and cross-sections of European options data. The component GARCH model slightly outperforms the FIGARCH in fitting return data but significantly dominates the FIHNGARCH in capturing option prices. The findings are mainly due to the shorter memory of the FIHNGARCH model, which may be attributed to an artificially prolonged leverage effect that results from fractional integration and the limitations of the affine structure.
33
Grennan, Eoin David. "A system to detect gradual change in long term EEG /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31054.
Full textAbstract:
A system was developed for detecting gradual changes in background EEG, with a view to simplifying the tedious task of long-term monitoring in the neurological intensive care unit.Six-channel EEG recordings serve as input to the system. EEG from each hemisphere is segmented into variable length epochs described by nine-dimensional feature vectors. A fixed scaling operation is performed so that differentiation between segments using the Euclidean distance between feature vectors relies equally on each feature.
Cluster analysis is performed to select five types of EEG that best represent the data spread for each hour. Color-coded circles representing clusters from every hour are mapped on a two-dimensional plot. The relative location of these circles reflects the difference between their associated EEG. Change between hours is detected by observing the movement of circles associated with each hour.
Detection of change with this method agreed closely with that observed via manual review but was much simpler.
34
Bates, Philip J. "Improving long-fibre compounding via a novel thermoplastic pultrusion process." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59584.
Full textAbstract:
A pultrusion process using staggered cylindrical pins in a molten polymer reservoir is one method of pre-compounding long glass fibre-reinforced thermoplastic materials. This material, if well impregnated with resin, will maintain much of its aspect ratio during subsequent moulding. The longer fiber length translates into improved mechanical properties versus conventional extrusion compounded material. This research studies the effect of a novel pin shape and configuration on the wetting of glass roving during thermoplastic pultrusion compounding.Experimental pultrusion studies using polypropylene indicate that alternating concave (collecting) and convex (spreading) contoured pins promote superior resin impregnation compared to conventional cylindrically shaped pins. A mathematical model describes the necessary convex pin contour and was used to fabricate the convex pins employed in the research. Pins thus designed promote uniform filament spreading across the wide convex contour which in turn favours good resin impregnation.
35
Ye, Yufeng 1971. "The study of long time relaxation behavior of metallocene polyethylene /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31081.
Full textAbstract:
The long time relaxation behavior of linear and long chain branched (LCB) metallocene polyethylene (mPE) is very important for understanding their flow properties. One linear and four LCB mPEs were studied in shear creep and recovery measurements. All the mPEs have similar molecular weight and molecular weight distribution but different levels of long chain branching. A technique was developed to eliminate the effect of non-ideal start-up at the beginning of creep experiment and the small residual stress that exists during the creep recovery period. It is found that the existence of long chain branching is responsible for the increasing of the zero shear viscosity, the steady state compliance and the longest relaxation time. The retardation and relaxation spectrums were calculated from the creep compliance. The dynamic compliance calculated using retardation spectrum is compared with that measured directly. Both are in very good agreement. These observations are compared with the molecular dynamics theory.
36
Buyskikh, Anton S. "Dynamics of quantum many-body systems with long-range interactions." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28798.
Full textAbstract:
Constantly increasing experimental possibilities with strongly correlated systems of ultracold atoms in optical lattices and trapped ions make them one of the most promising candidates for quantum simulation and quantum computation in the near future, and open new opportunities for study many-body physics. Out-of-equilibrium properties of such complex systems present truly fascinating and rich physics, which is yet to be fully understood. This thesis studies many-body dynamics of quantum systems with long-range interactions and addresses a few distinct issues. The first one is related to a growing interest in the use of ultracold atoms in optical lattices to simulate condensed matter systems, in particular to understand their magnetic properties. In our project on tilted optical lattices we map the dynamics of bosonic particles with resonantly enhanced long-range tunnelings onto a spin chain with peculiar interaction terms. We study the novel properties of this system in and out of equilibrium. The second main topic is the dynamical growth of entanglement and spread of correlations between system partitions in quench experiments. Our investigation is based on current experiments with trapped ions, where the range of interactions can be tuned dynamically from almost neighboring to all-to-all. We analyze the role of this interaction range in non-equilibrium dynamics. The third topic we address is a new method of quantum state estimation, certified Matrix Product State (MPS) tomography, which has potential applications in regimes unreachable by full quantum state tomography. The investigation of quantum many-body systems often goes beyond analytically solvable models; that is where numerical simulations become vital. The majority of results in this thesis were obtained via the Density Matrix Renormalization Group (DMRG) methods in the context of the MPS and Matrix Product Operator(MPO) formalism. Further developing and optimizing these methods made it possible to obtain eigenstates and thermal states as well as to calculate the time dependent dynamics in quenches for experimentally relevant regimes.
37
Cloutier, Jacques. "The search for a new long-range force weaker than gravity /." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61974.
Full text
38
Henning, John Gordon. "Evaluation of long-hole mine design influences on unplanned ore dilution." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102985.
Full textAbstract:
Unplanned ore dilution or stope overbreak, which has a direct and large influence on the cost of a stope, and ultimately on the profitability of a mining operation, can be attributed to both the mining process and to geologic setting. The research undertaken in this document, applicable to a wide range of underground mines employing the blasthole mining method to extract tabular orebodies, focuses on examining factors attributable to the generation of unstable stope hanging-walls.The primary objective of the research undertaken is to establish new models for stope and orezone design, with respect to anticipated stope overbreak, focusing on the position and type of stope within the orezone extraction sequence. Identified factors influencing unplanned dilution, such as: induced stress environment, stope geometry, and the setting of individual stopes are considered.
The research undertaken incorporates a variety of components, including (i) parametric 3-D numerical modelling to examine influences of individual factors on hanging-wall overbreak, (ii) case example analysis, and (iii) orezone extraction sequence simulation, using 3-D elastic numerical modelling. Design criteria, developed from the parametric modelling, was applied to the orezone sequence modelling to develop trends for stope dilution, as functions of stope design and construction.
It was found that hanging-wall overbreak is not significantly influenced by depth alone, and that stopes with large vertical and short horizontal dimensions or stopes having long horizontal and short vertical dimensions are more stable than large square-like stopes. Also, through parametric and case studies, it was demonstrated that, in addition to stope dimension, the amount of unplanned dilution differed according to stope type. Five stope types were identified, based on their position within a tabular blasthole mining sequence. Measured overbreak varies with stope type, with secondary stopes generating a greater volume of hanging-wall dilution than do primary stopes. A pillarless mining sequence will generate less overall dilution than a primary stope: secondary pillar mining sequence.
39
Groves, T. C. (Thomas Cameron). "The cross : a long poem using the techniques of numerical composition." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26272.
Full textAbstract:
The Cross is a long poem with a numerologically determined structure. In my introduction I examine some of the ideas behind the tradition of literary numerological composition, particularly those presented in the Timaeus of Plato and in Augustine's De musica. I then scrutinize number's aptness as a unifying principle in the poem, briefly elucidating the Golden Proportion and showing its centrality to the poem's structure, concluding with a look at my use of number metaphor. The Cross, partly and wholly the embodiment of these theories, follows. Its subject matter is the history of Montreal. Each book has a unifying focus: Book I centres on Jacques Cartier's explorations in 1535; Book II on the activities of the fictional character Mrs. Chau, in the recent past; and Book III on the visit of the Prince of Wales in 1860 for the inauguration of the Victoria Bridge.
40
Smith, Ward N. (Ward Nolan). "Leaching of 14C radio-labelled atrazine in long intact soil columns." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60459.
Full textAbstract:
A leaching study was undertaken with $ sp{14}$C radio-labelled atrazine in long, intact, soil columns to investigate the fate and transport of atrazine in a Quebec sandy loam soil and to test two contaminant transport models, namely PRZM and LEACHMP.Results indicated a large variation in atrazine concentration. The maximum levels in the leachate of the soil columns ranged from 0 to 11.2 $ mu$g/L. Deisopropyl-atrazine, the principal metabolite in the soil columns, was detected near the soil surface and did not leach beyond 15 cm depth. The adsorptive and desorptive capacity of atrazine in the soil columns was mainly attributed to organic matter and moisture content.
LEACHMP was found to be superior in predicting hydrologic characteristics in the soil columns as compared to PRZM which required calibration. Both models underestimated levels of atrazine near the soil surface and in the leachate (115 cm depth). The results from first and second order analysis for PRZM and LEACHMP showed considerable uncertainty in atrazine fate and transport. First and second order analyses were found to be useful tools in indicating where efforts to reduce uncertainty can best be directed.
41
Yang, Yongchang 1965. "Elastic-plastic buckling of infinitely long plates resting on tensionless foundations." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100237.
Full textAbstract:
There is a class of plate buckling problems in which buckling occurs in the presence of a constraining medium. This type of buckling has been investigated by many researchers, mainly as buckling of elastic columns and plates on elastic foundations. Analytical solutions have been obtained by assuming the foundation to provide tensile as well as compressive reaction forces. The present work differs from the previous ones in two respects. One, the foundation is assumed to be one-sided, thus providing only the compressive resistance. Two, the plates are allowed to be stressed in the plastic, strain-hardening range. Equations for determining the buckling stresses and wavelengths are obtained by solving the differential equations for simply supported and clamped long rectangular plates stressed uniformly in the longitudinal direction. The relevance and the usefulness of the obtained formulas is demonstrated by comparing the predicted results with the experimental results of other researchers on buckling of concrete filled steel box-section and HSS columns. It is shown that the theoretical buckling loads match quite closely with the experimental ones, and hence, should prove useful in formulating rules for the design of such columns.
42
Shourie, Arunachal. "Whether APAs are a long term solution to transfer pricing disputes?" Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32813.
Full textAbstract:
Transfer pricing is an area of major concern for tax administrations. The growth of multinational enterprises and an increase in cross border transactions has highlighted the significance of a regulated transfer pricing system. However, this regulated system imposes high penalties for improper transfer pricing. To reduce the risk of high transfer pricing penalties, multinational enterprises have resorted to advance pricing agreements with tax administrations. These agreements, though, are not a simple solution to reduce the risk of penalties. The process of executing these agreements carries with it the major drawback of information disclosure.Given this drawback, the APA programs in the United States and Canada, as they stand today, are not long term solutions to transfer pricing disputes which arise out of improper transfer pricing or improper adoption of transfer price determination methods.
43
Huang, Yilan. "Applications of Markov chains to reliability of long-haul communication systems." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23275.
Full textAbstract:
This thesis applies Markov chain methods to evaluate the reliability of multipath switching networks and optical amplified systems in long-haul communication systems. When conventional methods proved impractical to evaluate the reliability of multipath switching networks and optical amplified systems, some practical methods based on Markov chains were developed by Whitmore and others (1987, 1988, 1991) and used successfully to evaluate the reliability of such systems. This work aims at describing the details of Markov chain methods for reliability calculation, and demonstrating their application to reliability evaluation of multipath switching networks and optical amplified systems.
44
Lanoix, Eric LM. "A mathematical model for the long-term dynamics of tethered spacecraft /." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29859.
Full textAbstract:
A tethered satellite system consists of two or more orbiting satellites linked together by a tether (or cable). Although much theoretical and experimental work has contributed to a good understanding of the short-term dynamics of tethered systems, their long-term behaviour remains unexplored. Hence, a detailed mathematical model and a software have been developed to analyse the long-term effect of the low Earth orbit environment on tethered systems. The software predicts the trajectory and the attitude of the system, as well as the temperature and the longitudinal vibrations of the tether. The program accounts for the effects of atmospheric lift and drag, asphericity of the Earth (zonal and sectorial harmonics), solar and Earth radiation, electromagnetic forces, lunisolar attraction, and material damping.The thesis reviews previous research work in the field and extends it using more detailed models of external perturbations. Particular attention is given to the three major external forces influencing the dynamics of tethered systems: atmospheric forces, Earth oblateness effects, and electromagnetic forces. Furthermore, analytical solutions are provided for the problem of atmospheric drag induced shift of the equilibrium angle.
It was noted that the present formulation can predict the long-term motion of non-conductive librating tethered systems (such as TiPS) with greater accuracy than previous models. The simulation software is also used to study the behaviour of spinning and conductive systems. The results show that bare conductive tethers can decay the orbit of spent rocket stages or dysfunctional satellites over 100 kg at a lower "weight cost" than traditional rocket systems and much faster than atmospheric drag.
45
Marin, Joseph R. "Production of sophorolipids from long-chain fatty acids by candida bombicola." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79250.
Full textAbstract:
Tall oil, a mixture of long-chain oleic and linoleic acids, was found to be a suitable lipophilic substrate for the production of sophorolipid, an extracellular glycolipid surfactant, by Candida bombicola ATCC 22214. Oxygen limitation was found to decrease sophorolipid production in this system. Partitioning experiments with sophorolipid revealed that the surfactant increases the affinity of oleic acid for the aqueous phase of a two phase system. C. bombicola therefore has potential applications in the remediation of pulp and paper effluent containing recalcitrant long-chain fatty acids; both for its ability to degrade the acids and for the tendency of sophorolipid to make fatty acids more bioavailable to organisms involved in downstream activated sludge treatment. A novel capillary gas chromatography method was developed to rapidly and quantitatively analyze long-chain fatty acids.
46
Pietersma, Eric Geoffrey. ""The rhymer in the long tongued room" : Dylan Thomas and radio." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23353.
Full textAbstract:
Dylan Thomas's relationship with radio is marked by an increasingly complex aesthetic response. The broadcasts which he wrote for the B.B.C. demonstrate a progressive refinement of technique and an increasingly original approach to the medium. Under Milk Wood, in many regards, represents the culmination of this broadcasting work; it is a remarkable response to the evocative potentials of radio. But the piece, apart from confirming Thomas's achievement in radio, also provides a unique vehicle for exploring critical treatment of a non-textual form like radio. The critical history of Under Milk Wood emphasises the need for a "form-sensitive" criticism appreciative of the artistic potentials and restrictions of radio. Finally, it is these potentials and restrictions, masterfully explored by Thomas, which can also be seen as exerting a powerful influence on Thomas's own artistic sensibility. The social essence of radio altered Thomas's own artistry.
47
Knock, Erin Heather 1981. "Long-term dietary folate deficiency and intestinal tumor development in mice." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115689.
Full textAbstract:
Epidemiological evidence linking dietary folate deficiency and risk for colorectal cancer is conflicting. Studies using animal models indicate that timing, dose and presence of pre-malignant lesions will influence whether folate deficiency prevents or promotes tumor formation. In this thesis a new model of spontaneous tumor formation due to long-term dietary folate deficiency alone, in non-transgenic mice and without carcinogen induction, is developed. The mechanisms by which folate deficiency might influence cancer risk are also examined.BALB/c mice, with or without a null allele in a key folate-metabolizing enzyme, Methylenetetrahydrofolate reductase (Mthfr ), develop intestinal tumors due to dietary folate deficiency alone. On folate-deficient (FD) diets, 12.5% of Mthfr+/+ mice and 28.1% of Mthfr+/- mice developed tumors; mice on control diet (CD) did not. C57B1/6 mice (a strain resistant to other methods of tumor induction) placed on the same diets for the same amount of time did not develop any tumors. To investigate possible mechanisms the levels of DNA damage (dUTP/dTTP ratio and p-H2AX staining) and DNA methylation (thin layer chromatography) were examined. FD BALB/c, but not C57B1/6 mice, had a trend towards increased dUTP/dTTP and DNA double-strand breaks and decreased global DNA methylation compared to CD mice. To determine why the FD diet affects the BALB/c and not the C57Bl/6 strain, the expression of genes involved in folate metabolism was examined. Several changes in gene expression were observed. In particular, BALB/c mice had increased Mthfr expression and MTHFR activity compared to C57Bl/6 mice. Increased MTHFR activity may deplete 5,10-methylenetetrahydrofolate supplies for the dTMP synthesis, increasing the dUMP levels and, possibly, DNA damage. The levels of several DNA repair genes were also examined. Two genes involved in base excision repair, Thymine DNA glycosylase (Tdg) and Apurinic/apyrimidinic endonuclease 1 (Apex1), were increased in FD C57B1/6 compared to FD BALB/c mice suggesting increased DNA repair capacity.
These results support the evidence that dietary folate deficiency promotes intestinal tumor formation possibly through increased DNA damage, with subsequent defects in DNA repair.
48
Muda, Muhamad. "Analysing the choice of Malaysia as a long-haul tourist destination." Thesis, University of Strathclyde, 1992. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21275.
Full textAbstract:
The purpose of this study was to investigate how the British tourists move through a decision process in choosing Malaysia as a long-haul holiday destination. The purchase of a long-haul holiday is thought to be complex with high involvement and deliberation as well as being more expensive and bought less frequently (may be once a year). As such, a five-stage decision process is used: i) problem recognition, ii) information search, iii) evaluation of alternatives, iv) purchase decision and v) postpurchase behaviour. The research was conducted at two levels. The first level was self-administered tourists' survey questionnaire carried-out over a three-month period in Malaysia. The second level involved a British tour operators' survey which was supplemented by personal interview in order to get a better insight into the problems and potentials of Malaysia as a long-haul destination. "In search of new experience," "rest and relaxation",and "cultural attraction" were ranked as the three most important motivational factors influencing the decision to travel long-haul. Personal sources of information seemed to dominate in every stage of the decision process. Tourists evaluated Malaysia very favourably only on two tourist-attracting attributes - entertainment and shopping facilities; but these attributes were less important to them when selecting their holiday destinations. Husbands and wives were found to be in agreement on nine of the eleven subdecisions. Generally, tourists expressed high satisfaction with their holiday experience in Malaysia. Nevertheless some significant differences were found between independent and packaged tourists. Independent tourists were more satisfied with all the "product and service superiority" factors compared to the packaged tourists. With local services, independent tourists were significantly more satisfied than the packaged tourists with pleasant attitudes of the people and the personal security aspects of the "health and safety" factor. With regards to overall value for money and overall satisfaction, the independent tourists were significantly more satisfied than the packaged tourists. Comparison between destinations within the region also revealed different satisfaction levels across various dimensions. The study provides useful empirical support which enable tourism planners in making specific improvements in order to maintain and/or increase tourist satisfaction. For tourism marketers, creation of unrealistic tourist expectation through excessive promotional exaggeration should be avoided to circumvent tourist dissatisfaction.
49
Pentland, Wendy E. "Upper extremity function in long term paraplegia and implications for independence." Curtin University of Technology, School of Physiotherapy, 1992. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=15684.
Full textAbstract:
The intent of this study was to describe the effects of long term paraplegia and wheelchair use on upper limb function. Bilateral upper extremity isokinetic and grip strength, pain, and active range of motion were compared in 52 men with paraplegia (mean age 44 years: mean duration of spinal cord injury (SCI) 17 years) and 52 age and activity-level matched able-bodied men. The impact of upper limb pain on activities of daily living (ADL) performance was examined in the paraplegic sample. Strength was not significantly different between the two samples except for bilateral shoulder flexion (able-bodied stronger) and bilateral elbow extension (paraplegia stronger). Strength changed similarly with age in the two groups. The effect of duration of SCI on strength, excluding age, was significant for grip strength only. Duration of paraplegia and activity-level were better predictors of strength than age in 9 of 14 muscle groups, whereas in the able-bodied, age was the best strength predictor. Limited bilateral shoulder internal rotation and non-dominant external rotation were associated with paraplegia. Upper limb pain in the past week was associated with paraplegia (shoulder p<.001; elbow p<.00l; wrist/hand p<.00l). Reported pain prevalences for the paraplegic sample were: shoulder 39%, elbow 31%, wrist/hand 40%. The paraplegic subjects' pain intensity ratings revealed them to be experiencing mild to moderate levels of upper limb pain. Shoulder pain was associated with duration of injury, exclusive of age (p<.05). Measurement of the impact of upper limb pain On 18 activities of daily living (ADL) tasks revealed pain to be experienced by the majority of subjects with paraplegia (mobility tasks 60%; self-care tasks 5 8 % ; general activities tasks 60%). However, only 23-35% had made changes in their routines, and 6-16% had sought assistance with ADL due to upper limb pain. ++When age was excluded, it appeared that duration of SCI was more associated with pain during ADL, but this was significant only for pain during self-care tasks. The tasks most reported to cause upper limb pain were work/school, sleep, wheelchair transfers, outdoor wheeling, and driving. These results suggest that preventative and management steps are required to ensure continued independence and quality of life in this group over time. The effect of duration of SCI suggests that limitations in upper limb function may be seen in this population at relatively young ages.
50
Nai, Hui-Fang, and 乃慧芳. "MEN''S LONG JUMP." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/03867043022671618094.
Full textAbstract:
碩士國立體育學院
教練研究所
88
This study consists of 17 years of my practical experiences and what I have learned in track and field events. The study has been written based on scientific theory in sports and relevant literatures on skill training gathered from Taiwan, China and the USA. It focuses on the basic concept of long jump and training contents in the hope to provide assistance to coaches and athletes on their training. This study consisted of seven chapters as follows: 1.Summary The study features the origin of long jump, characteristics and development, including facilities, skills, evolvement and development of performance, both international situation and domestic situation, and their future trends. 2.Scientific training of long jump To promote long jumper''s performance, either coaches or athletes must possess the knowledge of sports science. According to sports physiology, biomechanics, and sports psychology, the study puts forth the application of long jump. 3.Exercise physiology for long jump. Physical training and strength training both are important for long jump. And weight-training also. The sets and the frequency of the set must be determent. 4.Long jumper''s technique analysis and training Long jump is a competition in terms of distance and the movement of a parabolic curve. The movement of long jump is analyzed according to the principle of dynamics. In addition, the study describes relevant training methods, individual skills and how to improve them. 5.Mental training and direction Mental factors play an important role to decide win or loss in a high-level competition. This study reveals the importance of mental training to athletes and mental factors can affect their performance in long jump. 6.Training schedule The making and implementation of training programs are the central part of the training process. According to training seasons, the training programs are arranged and planned at a regular basis, such as weekly, monthly or yearly. 7.Health management for long jumper During the training process, coaches should place much emphasis on athletes’ health both in body and mind. The study explores the prevention and care of sport injures which may occur in athletes’ daily life, or in the training or in competition. In addition, it provides personal experiences in sports injuries and rehabilitation.