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Whale, L. R. J. "Deformation characteristics of nailed or bolted timber joints subjected to irregular short or medium term lateral loading." Thesis, London South Bank University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380658.
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Er, Akan Asli. "Some Observations On Seismic Behaviour Of Traditional Timber Structures In Turkey." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605023/index.pdf.
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This thesis is about behaviour of traditional timber structures under lateral loads in Turkey. The timber-framed houses are the products of cultural heritage of people who live in Anatolia. These structures have performed well in earthquakes throughout the history. As a result, this study intends to present the observations on the seismic behaviours of traditional timber buildings with the help of computer-generated models. In this thesis, the general characteristics of timber are examined, the earthquake problem is briefly introduced, its effects on buildings are discussed, current knowledge on the earthquake performance of traditional Turkish timber buildings is presented, and their seismic behaviours are shown by using SAP2000 to help to better understand their behaviours in an earthquake.
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Hensyl, Curtis Hamilton. "Impacts of Land and Ownership Characteristics on the Stumpage Prices for Virginia's Nonindustrial Forests." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/31706.
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The character of Virginia's nonindustrial private forests is changing primarily for two reasons. First, many large, continuous forested tracts are being sub-divided, into with the resulting smaller tracts purchased for amenity values and recreation instead of as a timber investment (Hodge 1993). Second, the demographics of non-industrial private forest (NIPF) landowners are shifting away from an agricultural, rural focus to an urban oriented lifestyle and absentee ownership. These changes may mean less timber available for purchase by the forest industry. Timber that is sold will be on smaller parcels that is bound to have an impact on the procurement activities of forest industries. However, little research has been performed on the impacts of site and landowner characteristic on stumpage prices.
The objective of this research project is to identify how the stumpage price of timber is altered by the characteristics associated with the changing forest: decreasing tract size, decreasing harvested volumes, landowner residence, and landowner harvesting preferences. In addition to the price of timber, the competitiveness of timber sales is analyzed to determine what impact the fragmented forest could have on the competitiveness of timber markets.
To perform the study, site and landowner information was collected for 138 recent NIPF timber sales that occurred within central Virginia. This region is identified as a critical area for the study of forestry activities because of the growing urban and suburban residential populations and the large amount of forest industry activities taking place there.
Results show that access to the site is the most important characteristic determining the selling price of timber. Sites that are easy for logging crews and vehicles to approach dramatically increase the price paid per ton. Tract size is less important in determining bid prices for timber either once the total volume harvested passes a minimum of 500 tons, or there is mature hardwood sawtimber on the site and the acreage is greater than 50 acres. Landowners preference for select cut harvests results in a lower price per ton being paid by the purchaser due to the increased logging costs associated with this type of harvesting.Master of Science
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Vinson, Christina C. "Impact of selective logging on inbreeding and gene flow in two Amazonian timber species with contrasting ecological and reproductive characteristics." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.510253.
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McNeil, Darin James Jr. "Gauging the Success of Timber Harvests Managed for Golden-winged Warblers (Vermivora chrysoptera)| Characteristics and Territory Density within a Wetland Reference System." Thesis, Indiana University of Pennsylvania, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1605064.
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The Golden-winged Warbler (Vermivora chrysoptera) is an imperiled songbird that breeds in early-successional plant communities of eastern North America. Conservation efforts on the breeding grounds have become a priority because population declines are understood to be driven chiefly by the loss/degradation of breeding habitat. Although the species is known to use a variety of upland and wetland habitat types, most previous research on the species has been conducted solely in uplands. I studied Golden-winged Warbler use and habitat characteristics in the Poconos region of Pennsylvania. Density estimates suggest that both timber harvests and wetlands support similar densities of Golden-winged Warblers. Microhabitat occupancy models revealed that those wetlands I surveyed with high densities of 1-2 m tall shrubs (>2x as many shrubs) supported fewer Golden-winged Warblers whereas wetlands with more saplings (>2x as many saplings) and sedge cover (~1.3x as many sedge observations) supported more warblers. Finally, I found that macro-scale habitat variables that I quantified did not predict species occupancy of wetlands, likely due to the homogeneous nature of the study area. My study suggests that both wetlands and timber harvests have similar capacity to support Golden-winged Warblers. Further, wetlands in the Poconos should be evaluated at the microhabitat-scale for vegetative attributes that meet Golden-winged Warbler habitat requirements, rather than at the macro-habitat scale.
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Williams, Lori Ann. "Amphibian Population and Community Characteristics, Habitat Relationships, and First-Year Responses to Clearcutting in a Central Appalachian Industrial Forest." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/10129.
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The overall goal of this project was to provide baseline data on amphibian species richness, relative abundance, and habitat use for a long-term landscape ecology study on MeadWestvaco industrial forest in the Allegheny Highlands of West Virginia. From results of area-constrained daytime searches (10 m x 10 m plots) across the landscape, I developed 9 regression models to predict amphibian relative abundance. I constructed models for each year for all plots on all habitat types, plots that were in a Stream Management Zone (SMZ), and plots that were in upland, or non-SMZ, habitat. Distance to perennial or ephemeral streams or perennial ponds (SMZ classification), the amount of available rocks along transects, and site index were the 3 most important habitat variables in models for all plots combined and were responsible for 24-32% of the inherent variation in population relative abundance. Other habitat variables that were significant in models were year, % canopy cover, the amount of available woody debris of decomposition classes 3-5 along transects, % woody stems (<7.5 cm DBH), soil pH, and % herbaceous vegetation. R2PRESS values for all 9 models ranged from 0.08 to 0.35. Amphibian relative abundance showed positive relationships with all significant habitat variables with the exception of year and % woody stems.
In natural cover object use/availability analyses, I discovered salamanders preferred rocks over woody debris, relative to the amount available of each. Salamanders preferred flat rocks to any other shape, flagstones to any other type of rock, and rock lengths in the 31-40 cm class. Preferred wood widths were in class 5-10 cm, while preferred wood lengths were in class <50 cm; salamanders exhibited strong preferences for wood in higher states of decomposition (class 3-5).
I provided baseline, preharvest data for 28-acre reference areas on 9 forest compartments scheduled for clearcuts. I sampled all 9 reference areas preharvest and sampled 3 during year 1 postharvest using coverboard and night plot surveys. On these 3 areas, species richness declined from preharvest to postharvest, but species diversity showed little change. Overall relative abundance declined significantly preharvest to postharvest with coverboard sampling (p=0.0172) and night plot sampling (p=0.0113). At coverboard stations, relative abundance declined significantly from preharvest to postharvest at a distance of 5-10 m (p=0.0163) and 40-50 m (p=0.0193) away from adjacent mature forest.
Finally, using Pianka's index, I compared the night plot and coverboard sampling techniques in terms of proportions of the 4 most common species captured. These sampling techniques on average were >80% similar for all reference areas.Master of Science
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Kelly, Katherine M. "Model Validation and Improvement Using New Data on Habitat Characteristics Important to Forest Salamanders, and Short-Term Effects of Forestry Practices on Salamander Movement and Population Estimates." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/36439.
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Amphibians, because of their semi-permeable skin, sensitivity to changing microclimates, and important role in ecosystems, are often viewed as indicators of ecosystem health. They make excellent organisms for studies on the effects of silvicultural practices. My goal was to provide recommendations for forest management in the southern Appalachians so that harvesting operations are compatible with maintaining healthy populations of forest amphibians.
I tested previously created habitat models that determined the most important habitat characteristics for salamanders. I counted salamanders in 240 10 x 10 m plots located in the MeadWestvaco Wildlife and Ecosystem Research Forest in north-central West Virginia. We also collected a variety of habitat data in these plots to predict salamander abundance with previously created models. These simple linear regression analyses of predicted versus observed values suggest for most models (7 out of 9) a weak relationship between predicted and observed values (R2 from 0.0033 to 0.2869, p from < 0.0001 to 0.7490). However, one of the models showed characteristics suggesting that it predicted new data as well or better than the original data, and therefore was the most accurate at predicting salamander abundance, and could be used for management purposes, although there was still much unexplained variation. This model included the variables woody stems (< 7.5 cm DBH), available rock, riparian status (i.e., within 15 m of a stream), percent overstory canopy cover, and available highly decomposed woody debris (decomposition classes 3 to 5). All of these relationships were positive except for woody stems, suggesting that in order to maintain healthy populations of salamanders, we should protect areas next to streams, with high amounts of rock, decomposed woody debris, overstory canopy cover, and few woody stems.
I also examined the immediate effects of clearcuts on salamander movement and population estimates. I batch marked salamanders in plots at the edges of a clearcut, and in a control plot. Using the Schnabel estimator, I estimated population sizes in each plot. I then compared population estimates pre- and post-harvest on the interior (harvested) and exterior (unharvested) sides of the plots, taking into account the control plot. I also examined adult-juvenile ratios and movements from one side of the plot to the other. I found no significant changes (p > 0.05) following harvest in any of these measures, suggesting that salamanders do not move out of the harvested area post-harvest, at least over the short term (10 months of this study). This suggests that a longer period of time (> 1 year) is required to observe the population declines detected in most studies.Master of Science
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Muhammed, Suhaimi Bin. "Preservation characteristics of Malaysian timbers." Thesis, University of Aberdeen, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385151.
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Factors influencing the application of copper(II) and boron-based preservatives to four commercially important timbers of Malaysia viz rubberwood (Hevea brasiliensis), (Koompassia malaccensis), keruing (Dipterocarpus spp.), and dark red meranti (Shorea spp.) were studied. Of the four, only kempas contains a significant amount of extractives; the ethanol-soluble extract reacts with copper(II) solutions to form insoluble Cu(II) complexes. The anatomical features which might influence the penetrability of preservative were shown by optical and electron microscopy to be starch grains, silica grains, gums and gum ducts, tyloses and the nature of pitting on various elements. Among the boron compounds studied, the trimethyl borate-methanol azeotrope gave better impregnation and relatively higher boric acid concentration. Both gas and liquid phase treatment of rubberwood gave a relatively high concentration of boric acid near the surface and a relatively low concentration in the interior. The distribution of copper in the four woods was established by atomic absorption spectrometry and scanning electron microscopy-energy dispersive X-ray analysis. The distribution is similar to that of boric acid in rubberwood. The distribution of copper(II) and the solvent in rubberwood during drying was revealed by X-radiography and chemical analysis. It involves movement of the liquid phase and not simply of the vapour phase. The way in which the treated wood is dried greatly influences the distribution of copper. Drying via the radial and tangential faces results in a relatively high concentration of copper at the periphery leaving the centre with a relatively low concentration.
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Canino-Vazquez, Iván R. "Aerodynamic Load Characteristics Evaluation and Tri-Axial Performance Testing on Fiber Reinforced Polymer Connections and Metal Fasteners to Promote Hurricane Damage Mitigation." FIU Digital Commons, 2009. http://digitalcommons.fiu.edu/etd/128.
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Damages during extreme wind events highlight the weaknesses of mechanical fasteners at the roof-to-wall connections in residential timber frame buildings. The allowable capacity of the metal fasteners is based on results of unidirectional component testing that do not simulate realistic tri-axial aerodynamic loading effects. The first objective of this research was to simulate hurricane effects and study hurricane-structure interaction at full-scale, facilitating better understanding of the combined impacts of wind, rain, and debris on inter-component connections at spatial and temporal scales. The second objective was to evaluate the performance of a non-intrusive roof-to-wall connection system using fiber reinforced polymer (FRP) materials and compare its load capacity to the capacity of an existing metal fastener under simulated aerodynamic loads. The Wall of Wind (WoW) testing performed using FRP connections on a one-story gable-roof timber structure instrumented with a variety of sensors, was used to create a database on aerodynamic and aero-hydrodynamic loading on roof-to-wall connections tested under several parameters: angles of attack, wind-turbulence content, internal pressure conditions, with and without effects of rain. Based on the aerodynamic loading results obtained from WoW tests, sets of three force components (tri-axial mean loads) were combined into a series of resultant mean forces, which were used to test the FRP and metal connections in the structures laboratory up to failure. A new component testing system and test protocol were developed for testing fasteners under simulated tri-axial loading as opposed to uni-axial loading. The tri-axial and uni-axial test results were compared for hurricane clips. Also, comparison was made between tri-axial load capacity of FRP and metal connections. The research findings demonstrate that the FRP connection is a viable option for use in timber roof-to-wall connection system. Findings also confirm that current testing methods of mechanical fasteners tend to overestimate the actual load capacities of a connector. Additionally, the research also contributes to the development a new testing protocol for fasteners using tri-axial simultaneous loads based on the aerodynamic database obtained from the WoW testing.
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Rumetshofer, Anna. "Playing the European Postal Code Lottery? : Analysis of Time to Market of new Drugs on the European Market." Thesis, Uppsala universitet, Nationalekonomiska institutionen, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-391498.
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This thesis seeks to investigate the vastly varying time to market of newly approved drugs across Europe. Firtsly, I use a country fixed effects model on data of newly approved drugs from 2014 to 2017 from 18 European countries. I investigate the correlations between medication specific characteristics and the launch time and find that drugs intended to treat HIV, rheumatism or hepatitis are correlated with a faster launch time. Orphan drugs, though they represent a third of the dataset are found to be insignificantly correlated with time to market. Using a drug fixed effects model, I research important country characteristics in relation to the launch time and find that countries with higher imports of medications are correlated with a quicker time to market. Countries with larger medication export sectors experience a longer waiting time, which could be linked to companies trying to hinder the parallel export of new drugs.
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Sammons, Marci C. "The Effects of Age and Task Timing Characteristics on Contingency Judgment." TopSCHOLAR®, 2004. http://digitalcommons.wku.edu/theses/211.
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Detecting contingency relationships between causal events allows us to adapt to and control these events. However, research has shown age-related impairments in this ability. The goal of this study was to examine how reduced processing speed in older adults affects contingency learning. Manipulating the time during which to generate the response, to test the limited time mechanism of processing speed, had little effect on contingency judgments. Varying the temporal contiguity of events, to test the simultaneity mechanism of processing speed, affected young adults’ contingency judgments. Older adults’ judgments were less accurate overall, and young adults’ judgments were similarly less accurate when there was less temporal contiguity of events. These findings lend support for a processing speed theory of contingency learning.
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Schuckman, Melanie. "Voice Characteristics of Preschool Age Children." Miami University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=miami1209154612.
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Vidigal, Mariana de Ribeiro Lopes e. Ferreira. "How well do portuguese part-time entrepreneurs perform?" Master's thesis, Instituto Superior de Economia e Gestão, 2014. http://hdl.handle.net/10400.5/7910.
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Mestrado em FinançasO propósito desta dissertação é examinar o desempenho dos empreendedores a tempo parcial, principalmente analisar sua sobrevivência. Recorremos a uma base de dados com dados do empregado-empregador (QP - "Quadros de Pessoal"), e selecionámos todas as novas empresas que se estabeleceram no período de 2000-2007, excluindo todas as organizações sem fins lucrativos, obtendo um total de 41,293 observações. As organizações sem fins lucrativos foram excluídos, porque este estudo incide sobre indivíduos que decidiram se envolver no empreendedorismo a tempo parcial como forma de obter um rendimento adicional. Um empreendedor a tempo parcial é uma pessoa que dedica o seu tempo livre a exercer uma actividade empresarial, enquanto mantém um trabalho regular. A nossa principal conclusão é que as características dos empresários de tempo parcial partilham algumas semelhanças com empresários a tempo integral, principalmente em termos de idade e tamanho da empresa.
The purpose of this study is to evaluate the performance of part-time entrepreneurs, more specifically evaluate their survival. We use an employer' employee dataset (QP - "Quadros de Pessoal"), we solemnly select all start-ups established between 2000 and 2007, and exclude nonprofit organizations, obtaining a total of 41,293 observations. The nonprofit organizations were excluded mainly because this study focused on individuals that decided to engage in part-time entrepreneurship as a way to gain an extra income. Part-time entrepreneurs are individuals who dedicate their spare time in engaging in entrepreneurial ventures while maintaining a regular job. Our major finding is that part-time entrepreneurs share some similarities with the full-time entrepreneur's features, mainly in terms of age and firm's size.
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Firmino, Catarina Filipa Fernandes. "Why do part-time entrepreneurs transition to full time entrepreneurship?" Master's thesis, Instituto Superior de Economia e Gestão, 2015. http://hdl.handle.net/10400.5/10139.
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Mestrado em FinançasEmpreendedorismo a tempo parcial é frequentemente considerado como sendo o primeiro passo para ingressar no empreendedorismo a tempo integral. Este estudo tem como objetivo investigar quais os determinantes que sustentam a transição mencionada. Para a realização deste estudo recorremos a uma base de dados portuguesa, Quadros de Pessoal Os empreendedores portugueses que transitam a sua actividade empresarial em tempo parcial para tempo integral são predominantemente homens com idades entre os 50 e 60 anos. A transição para uma actividade em tempo integral é mais passivel de ocorrer em indivíduos com maior educação e sem experiencia prévia na indústria. Em relação às características das empresas, podemos afirmar que quanto maior o tamanho da empresa no momento da sua fundação, maior será também, a probabilidade de a mesma empresa transitar de uma actividade parcial para uma actividade em tempo integral.
Part-time entrepreneurship is often considered to be the first step to full-time entrepreneurship. This study investigates the reasons and characteristics that lead part-time entrepreneurs to transitions into full-time entrepreneurship. To sustain this research, we ran through a matched employer-employee Portuguese database. Part-time entrepreneurs who transition to full-time are predominantly men individuals with ages between 50 to 65 years. The transition into full-time entrepreneurship is more likely to occur for high educated individuals with no previous industry experience. Additionally individual with a lower tenure and higher hours worked are more likely to move into full-time entrepreneurship. In regard to the ventures' characteristics, we find that, the larger ventures' size at its foundation, the higher is the likelihood of transition into full-time entrepreneurship.
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Chandran, Varadharajan. "Robust Method to Deduce Cache and TLB Characteristics." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1308256764.
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Chabalko, Christopher Carter. "Comparison of Paul and Morlet Wavelets for Measuring the Characteristic Scale of Peak Pressure Events on Low-Rise Structures." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34691.
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A methodology to measure a characteristic time scale (duration) of peaks in pressure and velocity data is presented. This methodology is based on the use of the Morlet and Paul wavelets. Detailed descriptions of these wavelets and their implementation procedures are given. The results show that similar time scales or durations can be measured using either Morlet or Paul wavelets. To obtain consistent results data windowing might need to be applied. Using the Paul wavelet, durations of events measured in different wind tunnel simulations are obtained and discussed.Master of Science
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Virebrand, Marcus. "Real-time monitoring of voice characteristics usingaccelerometer and microphone measurements." Thesis, Linköpings universitet, Reglerteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-69760.
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VoxLog is a portable voice accumulator, that uses both an accelerometer that measures skin vibrations and a regular microphone to collect data. The goal of the thesis was to implement and evaluate methods that based on this data estimate the three different voice parameters fundamental frequency, phonation and soundpressure level. For pitch, three different methods were evaluated. The different methods all require relatively low computational power since the goal was to implement at least one of them on the digital signal processor in the VoxLog. The results from these evaluations show that the best estimations of pitch were made with a FFT-based approach that uses phase information to get an estimation with high frequencyresolution. Phonation is estimated with an energy based voice activity detection method.This estimation is then used to choose when sound pressure level should be estimated. Here one of the main problems was to make a distinction between when sound pressure level should be estimated for the wearer of the VoxLog or when an estimation should be made for the background noise. This was solved by implementing a time window before and after phonation were neither is estimated. For both pitch and sound pressure level a feedback functionality was implemented. The feedback is given to the user via vibrations in the VoxLog, the feedback is given when estimated parameters break set limits on pitch or sound pressure level.
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Garcia, Mendoza Jesus Guillermo. "Lag Time Characteristics of Small Arid and Semiarid Watersheds in the Southwestern United States." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/311345.
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An evaluation for Lag time, defined as the time from the centroid of rainfall excess to the centroid of direct runoff, was performed for seven small watersheds in the Southwestern United States. The size of these watersheds range in size from 0.33 to 4.37 ha. The evaluation period goes from 2000 to 2010. This evaluation was compared versus 28 lag time equations.The USDA-ARS Southwest Watershed Research Center has developed an electronic data processing system where rainfall and runoff data is collected from sensors in the field and are transmitted to computers in the office.Prior to these data sets there were no measurable rainfall and runoff data. This digital data is generated by means of synchronized clocks in rain gages and flumes. As a result, the data from this electronic processing system offers a unique opportunity for hydrologic research. This infrastructure is a characteristic not often available in many other sites and a condition not enjoyed in previous investigations.There are several definitions of lag time depending on what particular time period is used to describe the occurrence of unit rainfall and runoff. But, time parameters currently lack commonly-accepted standard definitions.The various definitions for time parameters such as Lag Time, Time of Concentration, Time to Peak, Equilibrium Time and others, sometimes, are used interchangeably. Another aspect is that in Lag time determination, centers of mass play a critical role. This study found out that depending of the loss model chosen to estimate rainfall excess, it shall influence the determination of center of mass and hence the lag time.Some negative values were obtained for lag time when measured from peak of runoff to centroid of effective rainfall. However, in the lag time definition from centroid of effective rainfall to centroid of direct runoff, negative values were not obtained.One field in particular, time parameters currently lacks commonly-accepted standard definitions. This has become a source of profound confusion in this branch of science to the point where teams of scientists writing about and discussing hydrological Time Parameters can be compared to the aftermath at the Tower of Babel.
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Suozzo, Joseph C. "Being about our father's business characteristics of selected tentmaking entrepreneurs in South Asia /." Theological Research Exchange Network (TREN), 2000. http://www.tren.com.
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Asenjo, Christian, Frank Tocas, Manuel Silvera, and Fernando Campos. "Analysis of the influence of the characteristics of the environment on the time of pedestrian transhipment in a multimodal transport using the social force model." Institute of Electrical and Electronics Engineers Inc, 2020. http://hdl.handle.net/10757/656408.
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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.The Highway Capacity Manual (HCM-2010) indicates in Volume III (Chapter 17) how the characteristics of the environment can represent obstacles that influence the determination of the average pedestrian space. However, the HCM does not specifically analyse in detail how these obstacles affect specifically the path, speed and average walking time of pedestrian. This article performs a comparative analysis between two microsimulations models where it is evidence how by not considering the characteristics of the fixed and mobile environment, the transhipment time and the speed of people are modified. As a case study, the obstacles present in the environment during the transhipment carried out by users in an integrated multimodal transport system in the city of Lima are identified. The comparative analysis between both cases shows the influence of the characteristics of the environment of the transhipment and variation in the average speed of the pedestrians. The proposed study methodology is calibrated and validated by microsimulations in Vissim Software. The comparative analysis reflects an increase in the transhipment time of 19.4% and a decrease in the average speed of the pedestrians by 14.8 %, reflecting in the microsimulation model values near to the real behaviour of pedestrians.
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Huang, Ming-Hui. "Dynamic characteristics of slender suspension footbridges." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16450/.
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Due to the emergence of new materials and advanced engineering technology, slender footbridges are increasingly becoming popular to satisfy the modern transportation needs and the aesthetical requirements of society. These structures however are always "lively" with low stiffness, low mass, low damping and low natural frequencies. As a consequence, they are prone to vibration induced by human activities and can suffer severe vibration serviceability problems, particularly in the lateral direction. This phenomenon has been evidenced by the excessive lateral vibration of many footbridges worldwide such as the Millennium Bridge in London and the T-Bridge in Japan. Unfortunately, present bridge design codes worldwide do not provide sufficient guidelines and information to address such vibrations problems and to ensure safety and serviceability due to the lack of knowledge on the dynamic performance of such slender vibration sensitive bridge structures. A conceptual study has been carried out to comprehensively investigate the dynamic characteristics of slender suspension footbridges under human-induced dynamic loads and a footbridge model in full size with pre-tensioned reverse profiled cables in the vertical and horizontal planes has been proposed for this purpose. A similar physical suspension bridge model was designed and constructed in the laboratory, and experimental testings have been carried out to calibrate the computer simulations. The synchronous excitation induced by walking has been modelled as crowd walking dynamic loads which consist of dynamic vertical force, dynamic lateral force and static vertical force. The dynamic behaviour under synchronous excitation is simulated by resonant vibration at the pacing rate which coincides with a natural frequency of the footbridge structure. Two structural analysis software packages, Microstran and SAP2000 have been employed in the extensive numerical analysis. Research results show that the structural stiffness and vibration properties of suspension footbridges with pre-tensioned reverse profiled cables can be adjusted by choosing different structural parameters such as cable sag, cable section and pretensions in the reverse profiled cables. Slender suspension footbridges always have four main kinds of vibration modes: lateral, torsional, vertical and longitudinal modes. The lateral and torsional modes are often combined together and become two kinds of coupled modes: coupled lateral-torsional modes and coupled torsionallateral modes. Such kind of slender footbridges also have different dynamic performance in the lateral and vertical directions, and damping has only a small effect on the lateral vibration but significant effect on the vertical one. The fundamental coupled lateral-torsional mode and vertical mode are easily excited when crowd walking dynamic loads are distributed on full bridge deck. When the crowd walking dynamic loads are distributed eccentrically on half width of the deck, the fundamental coupled torsional-lateral mode can be excited and large lateral deflection can be induced. Higher order vertical modes and coupled lateral-torsional modes can also be excited by groups of walking pedestrians under certain conditions. It is found that the coupling coefficient introduced in this thesis to describe the coupling of a coupled mode, is an important factor which has significant effect on the lateral dynamic performance of slender suspension footbridges. The coupling coefficient, however, is influenced by many structural parameters such as cable configuration, cable section, cable sag, bridge span and pre-tensions, etc. In general, a large dynamic amplification factor is expected when the fundamental mode of a footbridge structure is the coupled lateral-torsional mode with a small coupling coefficient. The research findings of this thesis are useful in understanding the complex dynamic behaviour of slender and vibration sensitive suspension footbridges under humaninduced dynamic loads. They are also helpful in developing design guidance and techniques to improve the dynamic performance of such slender vibration sensitive footbridges and similar structures and hence to ensure their safety and serviceability.
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Westin, Kerstin. "Valuation of goods transportation characteristics : A study of a sparsely populated area." Doctoral thesis, Umeå universitet, Institutionen för geografi och ekonomisk historia, 1994. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-54419.
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This study describes how consumers and providers of transportation services in a sparsely populated area valuate different transportation characteristics and estimates how these valuations might affect the total goods flows and the flows on individual Origin-Destination links. It also tests Stated-Preference methods as a tool for valuating transportation characteristics. The hypothesis was that transportation consumers in sparsely populated areas are more sensitive to changes in the transportation characteristics cost and frequency than they are to changes in goods safety, time accuracy, and delivery time. The reason for this assumption was that the supply of transport modes and transport operators in these areas is limited in comparison to more urban areas. Acceptable transportation costs, in the sense that transportation is economically feasible, and possibilities to obtain a certain minimum transportation frequency are essential. It might, therefore, be necessary to renounce demands for time accuracy, goods safety, and delivery time. The results indicate that the consumers were most sensitive tp lowered distribution frequency. The probability of accepting a transportation service dropped by .19 when frequency decreased from three times to once per week. Changes in the characteristics delivery time and time accuracy were also significant. Reduced frequency would, from a consumer perspective, also result in the largest impact on the total goods. However, a cost increase of 25 percent and lower goods safety would result in a greater reduction of the total goods flow than would longer delivery time and lower time accuracy. The providers, on the other hand, were very sensitive to increased costs and lower revenues. A drop in quantity from 90 percent to 40 percent vehicle utilization was also significant. However, respondents in the strata 'private trucks' assigned more importance to changes in frequency and quantity. The largest effect on the total goods flow would be caused by a 25 percent cost increase. High demands on time accuracy would affect the goods flow more than would lowered revenue. A significant conclusion is that the Stated-Preference method used is an adequate tool in valuating transportation characteristics. However, great care must be taken in formulating the characteristics and levels used. Also, in addition to the characteristics tested in this study, there may be other characteristics that help explain the probability that consumers and providers in sparsely populated areas will accept a transportdigitalisering@umu
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Parsafard, Mohsen. "Space-Time Transportation System Modelling: from Traveler’s Characteristics to the Network Design Problem." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6924.
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Traditional network design problems only consider the long-term stationary travel patterns (e.g., fixed OD demand) and short-term variations of human mobility are ignored. This study aims to integrate human mobility characteristics and travel patterns into network design problems using a space-time network structure. Emerging technologies such as location-based social network platforms provide a unique opportunity for understanding human mobility patterns that can lead to advanced modeling techniques. To reach our goal, at first multimodal network design problems are investigated by considering safety and flow interactions between different modes of transport. We develop a network reconstruction method to expand a single-modal transportation network to a multi-modal network where flow interactions between different modes can be quantified. Then, in our second task, we investigate the trajectory of moving objects to see how they can reveal detailed information about human travel characteristics and presence probability with high-resolution detail. A time geography-based methodology is proposed to not only estimate an individual’s space-time trajectory based on his/her limited space-time sample points but also to quantify the accuracy of this estimation in a robust manner. A series of measures including activity bandwidth and normalized activity bandwidth are proposed to quantify the accuracy of trajectory estimation, and cutoff points are suggested for screening data records for mobility analysis.
Finally, a space-time network-based modeling framework is proposed to integrate human mobility into network design problems. We construct a probabilistic network structure to quantify human’s presence probability at different locations and time. Then, a Mixed Integer Nonlinear Programming (MINLP) model is proposed to maximize the spatial and temporal coverage of individual targets. To achieve near optimal solutions for large-scale problems, greedy heuristic, Lagrangian relaxation and simulated annealing algorithms are implemented to solve the problem. The proposed algorithms are implemented on hypothetical and real world numerical examples to demonstrate the performance and effectiveness of the methodology on different network sizes and promising results have been obtained.
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Yeung, Hway-Seen. "Evaluation of legume cooking characteristics using a rapid screening method." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2514.
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Sant'Ana, Edson Hansen. "A concepção intervalar em Almeida Prado: um estudo em três obras pós-ruptura." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152167.
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O objeto de estudo deste trabalho é o processo intervalar na construção composicional de Almeida Prado em suas três fases pós-ruptura, chamadas de Pós-Tonal, Síntese e Pós-Moderna. A concepção intervalar do compositor é demonstrada por análises realizadas em três obras, uma de cada fase pós-ruptura: Sonata n. 3, Cartas Celestes I e Noturno n. 7, respectivamente. A análise tem sua metodologia baseada em um recorte arbitrário que buscou compreender três intervalos básicos que podem ser somados a outros três intervalos enarmônicos como ampliação das possibilidades intervalares na escrita. O desenvolvimento teórico da pesquisa aprofundou-se a partir de um foco e uma análise intervalar que, conceitualmente, buscaram uma superação terminológica de uma formulação anterior nomeada como expressividade intervalar (SANT’ANA, 2009) para a atualização terminológica definida como intervalo característico. O embasamento teórico para essa concepção intervalar deu-se a partir das proposições de Boulanger (1926), Costère (1954, 1962), Forte (1973), Straus ([1990] 2013), Pousseur ([2005] 2009) e Menezes (2002). Como contextualização crítico-histórica, foi realizada uma revisão sucinta de tendências teórico-analíticas e seus problemas, reconsiderando-se as observações de Schoenberg ([1922] 2001, [1954] 2004), Kerman ([1985] 1987), Cook (1987, 2007) e Kramer (2015). Para se validar a construção e o caráter da ferramenta teórico-analítica aqui empreendida, utilizou-se a teoria de Lacey (2008) associada à visão teórico-musicológica desses autores. Com o processo analítico, apresentado no quarto capítulo, procurou-se demonstrar a grande incidência do(s) intervalo(s) característico(s) na construção estrutural das obras, desvelando-se um número variado de estratégias composicionais adotadas por Almeida Prado associadas a esses intervalos. Ainda no quarto capítulo, foi aplicada a ferramenta denominada régua intervalar, que pode ajudar na melhor compreensão dos intervalos com mais potencial de dissonância, os quais agem por meio de interação e contraste frente ao background aparentemente tonal dos intervalos mais consonantes ligados aos primeiros sete parciais (harmônicos) da série harmônica. Assim, em uma pesquisa futura, a ferramenta e a proposição analítica aqui desenvolvidas podem contribuir na compreensão e na sistematização dos tipos de objetos harmônicos pensados como entidades tímbricas que são moldados a partir dessa concepção intervalar.
The object of study this work is the interval process in the compositional construction of Brazilian pianist and composer Almeida Prado in his three post-rupture phases, called PostTonal, Synthesis and Post-Modern. The intervalar conception of the composer is demonstrated by analyses carried out in three works - one from each post-rupture phase (Sonata n. 3, Cartas Celestes I and Noturno n. 7). The analysis has its methodology based on an arbitrary crop that sought to understand three basic intervals that can be added to three other enharmonic intervals as an extension of the interval possibilities in writing. The theoretical development of the research was deepened from a focus and an interval analysis that, conceptually, sought a terminological overcoming of an earlier formulation named as intervalar expressivity (SANT'ANA, 2009) for the terminological update defined as a characteristic interval. The theoretical basis for this interval conception came from the propositions of Boulanger (1926), Costère (1954, 1962), Forte (1973), Straus ([1990] 2013), Pousseur ([2005] 2009) and Menezes (2002). As a critical-historical context, a brief review of theoretical-analytical trends and their problems was carried out, reconsidering the observations of Schoenberg ([1922] 2001, [1954] 2004), Kerman ([1985], 1987), Cook (1987, 2007) and Kramer (2015). To validate the construction and character of the theoreticalanalytical tool undertaken here, Lacey (2008)’s theory was used associated with the theoretical-musicological view, methodologically adopted in this work. Like the analytical process contained in the fourth chapter, one tried to demonstrate the great incidence of the characteristic interval (s) in the structural construction of the works, revealing a varied number of compositional strategies adopted by Almeida Prado associated to these intervals. Still in the fourth chapter, the tool called interval rule was applied, which can help in better understanding the intervals with more potential of dissonance that act through interaction and contrast against the seemingly tonal background of the more consonant intervals linked to the first seven (harmonic) partials of the harmonic series. Thus, in a future research, the tool and the analytical proposition developed here, can contribute to the comprehension and systematization of the types of harmonic objects thought as timbral entities that are shaped from this intervalar conception.
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Gkritza, Konstantina. "Analysis of the characteristics of emergency vehicle operations in the Washington D.C. Region." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34632.
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Concerns about increased emergency vehicle response times in the Washington D.C. Region, especially during peak periods, have led to the implementation of signal preemption systems to facilitate the efficient and safe movement of emergency vehicles. However, to date only limited research has been carried out on the travel characteristics of emergency vehicles.
This paper presents an analysis of emergency vehicle characteristics to enhance our understanding of emergency vehicle operations and impacts and to assist public agencies and other stakeholders in the planning and deployment of emergency vehicle preemption systems. Emergency vehicle characteristics that merit special attention include temporal and spatial distribution of emergency vehicle travel; frequency and duration of preemption requests; platoon responses; and crashes involving emergency vehicles. Data on major corridors in Fairfax County, Virginia and Montgomery County, Maryland are used in the analysis.
The analysis indicates that such data are useful to assess the need for a preemption system along major arterials. Moreover, the analysis demonstrates the importance of considering emergency vehicle preemption impacts regarding delay to other vehicles. It is also important to note that there is some variability in the emergency vehicle characteristics depending on the proximity of a firehouse to an intersection and other factors. It is proposed that future efforts build upon this research to develop warrants to be used in determining the appropriateness of installing preemption systems at signalized intersections.Master of Science
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Sole, Christopher J. "Analysis of Countermovement Vertical Jump Force-Time Curve Phase Characteristics in Athletes." Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etd/2549.
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The purposes of this dissertation were to examine the phase characteristics of the countermovement jump force-time curve between athletes based on jumping ability, examine the influence of maximal muscular strength on the countermovement jump force-time curve phase characteristics of athletes, and to examine the behavior of the countermovement jump force-time curve phase characteristics over the course of a training process in athletes of varying strength levels. The following are the major findings of these dissertations. The analysis of athletes by jumping ability suggested that proficient jumpers are associated with greater relative phase magnitude and phase impulse throughout the phases contained in the positive impulse of the countermovement jump force-time curve. Additionally, phase duration was not found to differ between athletes based on jumping ability or between male and female athletes. The analysis of athletes based on maximal muscular strength suggested that only unweighted phase duration differs between strong and less-strong athletes. Interestingly, in both investigations based on jumping ability and maximal strength indicated the relative shape of the stretching phase representing the rise in positive force was related to an athlete’s jumping ability (jump height). The results of the longitudinal analysis of countermovement jump force-time phase characteristics identified that these variables can be frequently assessed throughout a training process to provide information of regarding an athlete performance state. Furthermore, based on the contrasting behaviors of many of the countermovement jump force-time curve phase characteristics over time, an athlete’s level of muscular strength may influence how these characteristics are expressed in the context of a training process.
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Wang, Min. "Characteristics of item response time for standardized achievement assessments." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5674.
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Response time (RT) data are able to provide unique insight into both items and examinees regarding speededness and time-demand and should be incorporated into test development practice. To allow test developers to utilize RT information, item RT needs to be summarized into point estimate(PE)(s) that can be understood by content specialists and saved into the item pool. The recent expansion of online testing in K-12 achievement assessments brings opportunities and challenges for measurement experts to investigate and utilize RT information in a context different from that in the majority of literature, in which licensing and certification tests, graduate admission tests, and other applications that incorporate computer-adaptive testing. Using empirical data from four tests in two grade levels of a K-12 standardized achievement assessment, this study explored the empirical distributions of item RT and their fit to five probability distributions, the characteristics of four item RTPEs, and the relationships between item RTPEs and eight item attributes. Based on the principal findings across tests and grades, the empirical distributions of item RT presented widely variable shapes and did not fit any of the five proposed probability distributions; the 90th quantile showed its important capability of capturing and avoiding speededness issues; and the associations between item RTPEs and item attributes proved to be mixed.
The generally idiosyncratic findings of this study call for a different perspective and approach to explore RT data and call for more empirical studies to enlighten test development practice in the K-12 standardized achievement assessment field.
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Caswell, Benjamin C. "Receiver Operating Characteristic (ROC) Curve Analysis of Affinity Profiles." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd3012.pdf.
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Ramsey, Michael W., G. Gregory Haff, Ann M. Kinser, Jenna M. Kraska, Margaret E. Stone, William A. Sands, H. Hasegawa, and Michael H. Stone. "Isometric and Dynamic Force-time Curve Characteristics of Collegiate Throwers." Digital Commons @ East Tennessee State University, 2007. https://dc.etsu.edu/etsu-works/4099.
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Saeed, Mohammed Ahmed 1940. "PRODUCTION CHARACTERISTICS OF HYBRID GRAIN SORGHUMS UNDER THREE PLANT POPULATIONS AND TWO PLANTING DATES." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/275493.
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Hayakawa, Naoki, 直樹 早川, Hitoshi Okubo, and 仁. 大久保. "Feature article - Lifetime Characteristics of Nanocomposite Enameled Wire Under Surge Voltage Application." IEEE, 2008. http://hdl.handle.net/2237/11172.
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Venkatasamy, Vasanth Kumar. "Analysis of in-cavity thermal and pressure characteristics in aluminum alloy die casting." Connect to this title online, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1100721824.
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Charest, Abigail J. "Investigation of Physical Characteristics Impacting Fate and Transport of Viral Surrogates in Water Systems." Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-dissertations/54.
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A multi-scale approach was used to investigate the occurrence and physical characteristics of viral surrogates in water systems. This approach resulted in a methodology to quantify the dynamics and physical parameters of viral surrogates, including bacteriophages and nanoparticles. Physical parameters impacting the occurrence and survival of viruses can be incorporated into models that predict the levels of viral contamination in specific types of water. Multiple full-scale water systems (U.S., Italy and Australia) were tested including surface water, drinking water, stormwater and wastewater systems. Water quality parameters assessed included viral markers (TTV, polyomavirus, microviridae and adenovirus), bacteriophages (MS2 and ΦX-174), and coliforms (total coliforms and E. coli). In this study, the lack of correlations between adenovirus and that of bacterial indicators suggests that these bacterial indicators are not suitable as indicators of viral contamination. In the wastewater samples, microviridae were correlated to the adenovirus, polyomavirus, and TTV. While TTV may have some qualities which are consistent with an indicator such as physical similarity to enteric viruses and occurrence in populations worldwide, the use of TTV as an indicator may be limited as a result of the detection occurrence. The limitations of TTV may impede further analysis and other makers such as coliphages, and microviridae may be easier to study in the near future. Batch scale adsorption tests were conducted. Protein-coated latex nanospheres were used to model bacteriophages (MS2 and ΦX-174) and includes a comparison of the zeta potentials in lab water, and two artificial groundwaters with monovalent and divalent electrolytes. This research shows that protein-coated particles have higher average log10 removals than uncoated particles. Although, the method of fluorescently labeling nanoparticles may not provide consistent data at the nanoscale. The results show both that research on viruses at any scale can be difficult and that new methodologies are needed to analyze virus characteristics in water systems. A new dynamic light scattering methodology, area recorded generalized optical scattering (ARGOS) method, was developed for observing the dynamics of nanoparticles, including bacteriophages MS2 and ΦX-174. This method should be further utilized to predict virus fate and transport in environmental systems and through treatment processes. While the concentration of MS2 is higher than ΦX-174 as demonstrated by relative total intensity, the RMSD shows that the dynamics are greater and have more variation in ΦX-174 than MS2 and this may be a result of the hydrophobic nature of ΦX-174. Relationships such as these should be further explored, and may reflect relationships such as particle bonds or hydrophobicity.
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Garcez, Aurélio Dos Santos João Pedro. "Voluntary and involuntary mental time travel in dysphoria and depression : characteristics and mechanisms." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/22968.
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Mental time travel (MTT) refers to an individual’s ability to mentally travel through subjective time, autonoetically re-experiencing past events under the form of autobiographical memories (past MTT), and pre-experiencing events as future autobiographical representations (future MTT). MTT can occur voluntarily, whereby a past/future autobiographical event is subjectively experienced as an intended occurrence, or involuntarily, wherein such an event is subjectively experienced as an unintended outcome of which the individual is aware. Studies investigating MTT’s characteristics in dysphoria and depression show that dysphoric and depressed individuals produce more overgeneral and negative MTT events when compared to control groups. However, existing research has been limited to past and voluntary MTT events, with few studies investigating involuntary MTT and future MTT in dysphoria and depression. The overarching aim of the present research was to compare the phenomenological characteristics of MTT in dysphoric individuals vs. normal mood individuals (Study 1), and in clinically depressed individuals vs. never-depressed individuals (Study 2), with the purpose of furthering existing knowledge on MTT and its relation with dysphoria and Major Depressive Disorder. This aim was addressed by conducting two studies, using a 2 x (2 x 2) mixed-factorial design, with temporality (past vs. future events) and type of retrieval (voluntary vs. involuntary events) as within-subjects independent variables, and participant group as a between-subjects variable. In Study 1, Portuguese university students were categorised into a dysphoric (n=17) or a normal mood group (n=39) depending on their score on the Beck Depression Inventory (BDI-IA) – cutoff point (≥ 10). In Study 2, clinically diagnosed depressed patients (n=32) were recruited from a Portuguese hospital and matched for age and gender with never-depressed control participants (n=32) recruited from the community. The dependent variables tested were: level of spatiotemporal specificity, self-relevance, mood and physical impact, valence, and visual perspective of the MTT events produced. A diary methodology was used in both studies, with an open-ended time period that lasted for a minimum of two weeks, for participants to record their MTT events and grade them on the above mentioned variables using Likert-type ratings. Between seven and fourteen MTT events were produced for each of the four MTT conditions (past voluntary, past involuntary, future voluntary, future involuntary). Results showed that when compared to their respective control groups, depressed, but not dysphoric participants, exhibited a clear influence of mood on several of the phenomenological characteristics of MTT. In Study 1 there were no statistically significant differences in the specificity, negative valence, and mood/physical impact of the MTT events produced by dysphoric and normal mood participants. On the contrary, in Study 2, results partially supported a lower specificity and fully supported a greater negativity and mood/physical impact of MTT events in depressed individuals compared with never-depressed participants. Both studies supported the greater self-relevance of voluntary MTT events and partially supported the hypothesised effect of type of retrieval in specificity. These were the first studies to directly compare past and future, voluntary and involuntary MTT events in dysphoric and depressed individuals, addressing existing gaps in the literature. The key limitation is the relatively small sample size of both studies, however each participant was comprehensively assessed for at least two weeks, providing a rich set of reliable data. Despite limitations, this thesis provides novel pilot findings that help understand the similarities and differences between involuntary and voluntary, past and future MTT, as well as providing new information regarding the possible role of MTT in dysphoria and depression.
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Thomas, Kathy Wright. "Voice Onset Time Characteristics of Selected Phonemes in Young and Old Male Speakers." Thesis, North Texas State University, 1985. https://digital.library.unt.edu/ark:/67531/metadc500707/.
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The purpose of the investigation was to compare mean voice onset time in young and old male subjects, as well as to examine variability of VOT productions with age for prevocalic bilabial, alveolar, and velar voiced and voiceless stop consonants. Forty-five Caucasion.males were divided equally into three.age groups. Ten tokens of six stimulus words were recorded and wide band spectrograms were made. Results of an analysis of variance revealed no significant differences in VOT with age when averages of the phonemes were used for analysis; however, a significant interaction between age and voiced phonemes was found when individual trials of phoneme productions were used for analysis.
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Reyes-Castro, Pablo A., Robin B. Harris, Heidi E. Brown, Gary L. Christopherson, and Kacey C. Ernst. "Spatio-temporal and neighborhood characteristics of two dengue outbreaks in two arid cities of Mexico." ELSEVIER SCIENCE BV, 2017. http://hdl.handle.net/10150/623139.
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Little is currently known about the spatial-temporal dynamics of dengue epidemics in arid areas. This study assesses dengue outbreaks that occurred in two arid cities of Mexico, Hermosillo and Navojoa, located in northern state of Sonora. Laboratory confirmed dengue cases from Hermosillo (N=2730) and Navojoa (N=493) were geocoded by residence and assigned neighborhood-level characteristics from the 2010 Mexican census. Kernel density and Space-time cluster analysis was performed to detect high density areas and space-time clusters of dengue. Ordinary Least Square regression was used to assess the changing socioeconomic characteristics of cases over the course of the outbreaks. Both cities exhibited contiguous patterns of space-time clustering. Initial areas of dissemination were characterized in both cities by high population density, high percentage of occupied houses, and lack of healthcare. Future research and control efforts in these regions should consider these space-time and socioeconomic patterns.
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Linford, Christena. "Effects of Neuromuscular Training on the Dynamic Restraint Characteristics of the Ankle." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd737.pdf.
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Tannous, Kareem Atalla. "Impact of Mortgage Characteristics on Retail Mortgage Transaction Completion Time." ScholarWorks, 2018. https://scholarworks.waldenu.edu/dissertations/5271.
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In the mortgage industry, many mortgage lenders cannot manage mortgage workflow systems while meeting and exceeding organizational objectives. Organizations with an above-industry average turnaround time (ATT) to complete a retail mortgage transaction (RMT) from origination to funding experience revenue losses. Grounded in the proposition that mortgage loan purpose (MLP), mortgage loan type (MLT), and subject property type (SPT) impact ATT to complete an RMT, the purpose of this causal-comparative study was to assess the impact of MLP, MLT, and SPT on ATT to complete an RMT. Using archival data records (N = 146) from a selected mortgage institution in the state of Florida, the results of the 2 x 2 x 2 factorial ANOVA showed that there were no main or interaction effects F(5,140) = 0.42, p = .83. Implications for social change include the possibility for mortgage lenders to implement improved workflow processes to reduce costs and improve efficiency metrics and intrinsic value, thereby benefitting organizational stakeholders such as employees and consumers.
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Kim, Jisun. "Study of the Performance and Characteristics of U.S. Academic Research Institution Technology Commercialization (ARITC)." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/494.
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This dissertation aims to provide a better understanding of the technology licensing practices of academic research institutions. The study identifies time durations in licensing and incorporates these into a model to evaluate licensing performance. Performance is measured by the efficiency of an institution's technology licensing process and efficiency changes over time, using Association of University Technology Managers annual survey data from 1991 to 2007. Organizational characteristics influencing the licensing performances of 46 U.S. research institutions also are explored. The study resulted in a new approach that integrates the identification of time lags in licensing, analysis of efficiency change, and exploration of the influence of organizational characteristics on efficiency change. A super-efficiency variable returns to scale data envelopment analysis (DEA) model was applied to the time-lag neutralized licensing data, to measure the efficiency of U.S. research institutions' licensing performance over time. The study also includes an innovative approach to resolving issues with the super-efficiency DEA model, including mathematical infeasibility and zero-data issues. The licensing mechanisms included in the study are disclosure, patent applications, patents issued, licenses and options executed, start-ups, and licensing income. The time duration from expenditure to licensing income, including all intermediating licensing processes, ranged from 2 to 27 years. The study identified the organizational characteristics related to licensing practice. Academic prestige and research quality are positively related to disclosure, patents granted, and start-up. The resources of a technology licensing office influences the number of licensing agreements, whereas licensing office experience has a positive relationship with start-ups. Increased licensing resources improve the efficiency of licensing practices, and a research institution with more dedicated licensing staff has improved licensing productivity. Private institutions improved their licensing practice more than public ones during the study period. On the other hand, institutions with a medical school demonstrated low efficiency. This dissertation fills a gap in the understanding of licensing practice and the organizational characteristics related to licensing performance. In addition, the study contributes to research methodology by providing a new approach to identifying time lags and improving the DEA method. The results, grounded in comprehensive observations over multiple time durations, provide an insight into the licensing practices of U.S. research institutions. The dissertation presents recommendations for research institutions based on the relationships identified among academic prestige, research intensity, organizational characteristics of the technology licensing office, and licensing performance.
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Bernhard-Oettel, Claudia. "Alternative employment and well-being : Contract heterogeneity and differences among individuals." Doctoral thesis, Stockholm : Department of Psychology, Stockholm University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8030.
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Hofmann, Susanne. "The Performance Measurement Process Concerning On-Time Delivery in Supplier-Customer Dyads : characteristics and consequences." Licentiate thesis, Växjö University, School of Management and Economics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-2456.
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Toomhirun, Sontichai. "Study of residential demand for electricity as functions of load control schemes and dwelling characteristics." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/80046.
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Residential demand is a large and important factor of the utility load during the system peak period. And the control of residential demand can make a significant change to the system load of the utility. This research is designed to study the residential end-use appliances under various direct load control schemes. These appliances are water heaters, air conditioners, and space heaters which are the major electrical demand of the residential load. The study will apply the LOADSIM, an Electrical Power Research Institute (EPRI) load simulation program, to conduct load control strategies of these residential appliances. The LOADSIM program can be applied both for cycling and shedding control strategies during a specified control period. In this study, the cycling control is done on an air conditioner and space heater. The water heating control is performed under shedding strategy.
The research has studied the appliance use of four house types under the same weather and control conditions. A total of 100,000 houses have been used in the study. These houses have the same dwelling and appliance characteristics but their house insulations are different. Diversity in house insulations gives different results in terms of load reduction and temperature change due to the load control. For example, a better-insulated house demands less electricity for its appliance than a low-insulated house. This study also uses the EPRl-LOADSIM program to estimate the load reduction and temperature change of each house type under the load control.Master of Science
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Zhou, Liren. "An analysis of journey to work characteristics in Florida using Census 2000 public use microdata sample data files." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000256.
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Schleinitz, Katja. "Cyclists’ road safety - Do bicycle type, age and infrastructure characteristics matter?" Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-203543.
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In den letzten Jahren hat die Verbreitung von Elektrofahrrädern, sogenannten Pedelecs, stark zugenommen. Dies ist vor dem Hintergrund der Umweltfreundlichkeit und Gesundheitsförderlichkeit dieser Form der Fortbewegung zunächst grundsätzlich positiv zu bewerten. Gleichzeitig besteht jedoch die Sorge, dass Elektrofahrradfahrer häufiger und in schwerere Unfälle verwickelt werden könnten als Fahrradfahrer. So bieten motorgestützte Elektrofahrräder das Potential, höhere Geschwindigkeiten zu erreichen als konventionelle Fahrräder, und werden zudem vor allem von älteren Verkehrsteilnehmern genutzt. Nicht zuletzt deswegen könnten sich durch diese neue Mobilitätsform auch neue Herausforderungen für die Verkehrs-, insbesondere Radinfrastrukturen ergeben. Tatsächlich jedoch blieben die Auswirkungen auf die Verkehrssicherheit bisher weitestgehend ungeklärt. Um dieser Problematik zu begegnen, wurde im Rahmen einer Naturalistic Cycling Studie (NCS) und mehreren experimentellen Untersuchungen folgenden Fragen nachgegangen: Fahren Elektrofahrradfahrer tatsächlich schneller als nicht-motorisierte Radfahrer? Wie wirken sich diese potentiell höheren Geschwindigkeiten darauf aus, wie Elektrofahrradfahrer von Autofahrern wahrgenommen werden? Welchen Einfluss hat das Alter der Radfahrer auf die Geschwindigkeiten und auch auf deren Neigung zu Unfällen bzw. sicherheitskritischen Situationen im Verkehr? Und welchen Einfluss hat die Infrastruktur auf die gewählten Geschwindigkeiten und die Auftretenshäufigkeit von kritischen Situationen? Diese und weitere Fragen wurden in insgesamt vier Arbeiten, die in internationalen Fachzeitschriften publiziert sind (I - IV), beleuchtet. Im ersten Artikel werden die Geschwindigkeiten von Fahrradfahrern (n = 31) im Gegensatz zu Pedelecfahrern (n = 49; Motorunterstützung bis 25 km/h) sowie S-Pedelecfahrern (n = 10; Motorunterstützung bis 45 km/h) betrachtet. Als Einflussgrößen wurden das Alter und die Nutzung verschiedener Infrastrukturtypen der Probanden ausgewertet. Alle Räder wurden mit einem Datenaufzeichnungssystem inklusive Kameras und Geschwindigkeitssensoren ausgestattet, um für vier Wochen ein Bild des natürlichen Fahrverhaltens zu erhalten. Unabhängig von der Infrastruktur waren S-Pedelecfahrer schneller unterwegs waren als Fahrrad- und Pedelecfahrer. Pedelecfahrer fuhren ebenfalls signifikant schneller als konventionelle Fahrradfahrer. Die höchsten Geschwindigkeiten wurden für alle Radtypen auf der (mit dem motorisierten Verkehr geteilten) Fahrbahn sowie der Radinfrastruktur gemessen. Das Alter der Fahrer hatte ebenfalls einen signifikanten Einfluss auf die Geschwindigkeit: Unabhängig vom Fahrradtyp waren ältere Fahrer (65 Jahre und älter) deutlich langsamer als Probanden jüngerer Altersgruppen (41-64 Jahre sowie 40 Jahre und jünger). Die beiden jüngeren Altersgruppen fuhren selbst ohne Motorunterstützung (konventionelles Fahrrad) schneller als die älteren Pedelecfahrer. Genauere Analysen (wie etwa das Verhalten beim Bergabfahren) legen nahe, dass dieser Befund nicht allein der physischen Leistungsfähigkeit zugeschrieben werden kann. Es scheint vielmehr so, als ob ältere Fahrrad- und Elektroradfahrer durch die geringere Geschwindigkeit versuchen, Defizite in der Reaktionsgeschwindigkeit auszugleichen bzw. generell vorsichtiger fahren. Der zweite Artikel beschäftigt sich mit der Frage, inwieweit sich die Art und Häufigkeit von Unfällen und kritischen Situationen bei den drei verschiedenen Altersgruppen unterscheiden. Auch hier wurde auf die Daten aus der NCS zurückgegriffen, auf deren Basis eine umfassende Videokodierung durchgeführt wurde. Es zeigten sich keine Unterschiede zwischen den Altersgruppen hinsichtlich des Auftretens kritischer Situationen; weder in Bezug auf die absolute Anzahl, noch gemessen an der relativen Häufigkeit (pro 100 km). Ebenfalls keine Zusammenhänge fanden sich zwischen dem Alter der Fahrer und der Art von Konfliktpartnern oder der Tageszeit der kritischen Situationen. Auch hier scheint es so, dass Ältere keinem erhöhten Risiko unterliegen, und etwaige altersbedingte Einschränkungen kompensieren können. Bei der Betrachtung des Einflusses des Infrastrukturtyps auf das Auftreten von kritischen Situationen zeigte sich, dass, bezogen auf die zurückgelegten Wegstrecken, die Nutzung der mit dem motorisierten Verkehr geteilten Fahrbahn als relativ sicher einzustufen ist. Demgegenüber ergab sich ein erhöhtes Risiko für Unfälle oder kritische Situationen auf designierter Radinfrastruktur. Dies widerspricht der Wahrnehmung vieler Radfahrer, die diese Infrastruktur als besonders sicher empfinden. Es ist allerdings anzunehmen, dass diese Wahrnehmung nicht nur auf der vermeintlichen Auftretenshäufigkeit, sondern auch auf dem angenommenen Schweregrad einer möglichen Kollision beruht. Zwei weitere Artikel beschäftigen sich damit, wie Autofahrer die Geschwindigkeit beziehungsweise die Annäherung von Elektrofahrrädern wahrnehmen. Dies ist insbesondere in Kreuzungssituationen relevant, in denen Autofahrer abschätzen müssen, ob sie noch rechtzeitig vor einem Fahrrad abbiegen können ohne mit diesem zu kollidieren. Es wurde vermutet, dass die fehlende Erfahrung mit Elektrofahrrädern und der von ihnen erreichbaren Geschwindigkeit vermehrt zu entsprechenden Unfällen führen könnte. Der Frage wurde mit einem Experiment zur Lückenakzeptanz auf der Teststrecke (Artikel III) und einer Videostudie zu Schätzungen von Zeitlückengrößen (Artikel IV) nachgegangen. Es zeigte sich, dass Autofahrer die verbleibende Zeit bis zur Kollision für Elektrofahrradfahrer geringer einschätzten als für konventionelle Radfahrer. Zudem wählten Autofahrer bei einem herannahenden Elektrofahrrad signifikant kleinere Zeitlücken zum Abbiegen, als bei einem konventionellen Fahrrad. Dieser Effekt verstärkte sich sogar noch, wenn die Geschwindigkeit des herannahenden Zweirades zunahm. Diese Befunde legen nahe, dass die Einschätzung der Geschwindigkeit beziehungsweise Annäherung von Elektrofahrrädern durchaus risikobehaftet ist. Die Ergebnisse dieser Arbeit helfen dabei, die Auswirkungen der steigenden Verbreitung von Elektrofahrrädern auf die Verkehrssicherheit einzuschätzen. Auch erlauben es die Erkenntnisse, Maßnahmen zur Erhöhung der Verkehrssicherheit für Fahrrad- und Elektrofahrradfahrern aller Altersgruppen abzuleiten. Damit leistet diese Arbeit einen Beitrag zur Unterstützung einer sicheren, gesunden und umweltfreundlichen MobilitätElectric bicycles (e-bikes) are a relatively new form of transport. The aim of this dissertation is to investigate their effects on road safety. In 2012, at the beginning of this dissertation project, knowledge of e-bikes in general and their impact on road safety in particular was relatively scarce. As a starting point of this work, the influence of e-bikes on road safety was investigated compared relative to the road safety of conventional bicycles. Additionally, the influence of the age of the rider on safety is considered as a supplementary factor. Special attention is paid to the impact of the infrastructure utilised by riders and its characteristics. This cumulative dissertation consists of four research articles, labelled Paper I to IV accordingly. Papers I to IV have been published in peer reviewed journals. The synopsis provides an overview of previous research as well as a theoretical framework of the safety of cyclists and e-bike riders. Speed, and its perception through other road users (measured with experiments to gap acceptance and time to arrival (TTA) estimates) are considered as relevant factors for road safety. In Chapter 4, the research objectives are presented in detail. The methodology is clarified in Chapter 5, and in Chapter 6 and 7 the results are summarised and discussed. The implications of the results are considered in Chapter 8. In Paper I, the differences in speed between bicycles, pedelecs (pedal electric cycle, motor assistance up to 25 km/h) and S-pedelecs (pedal electric cycle, motor assistance up to 45 km/h) were investigated. Additionally the influence of infrastructure type, road gradient and the age of the rider were taken into account. Paper II is concerned with the influence of different conflict partners in crashes, and the utilisation of infrastructure on the safety of cyclists. For this purpose, safety critical events (SCE) involving cyclists were examined, with a special focus on the differences between younger, middle aged, and older cyclists. Papers III and IV focus on the perception of speed of e-bike and bicycle riders through other road users and its implications for road safety. Paper III specifically deals with the gap acceptance of car drivers at intersections in the presence of cyclists and e-bike riders with different speeds and under varying conditions (e.g. at intersections with different road gradients). Paper IV looks at drivers TTA estimates of approaching bicycles and e-bikes in combination with other influencing factors (e.g. speed, cyclist age)
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Campbell, Jacob. "Characteristics of a real-time digital terrain database Integrity Monitor for a Synthetic Vision System." Ohio University / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1177441410.
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Long, Zhiming. "Growth, institutions and "socialist transition with chinese characteristics"." Thesis, Paris 1, 2017. http://www.theses.fr/2017PA01E043/document.
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Cette thèse commence par souligner les contextes et les difficultés d'analyse de l'économie chinoise : la première difficulté est la particularité de la Chine qui est également référencée comme «socialisme avec des caractéristiques chinoises», qui comprend le contexte culturel unique et la langue, la nature de l'économie, le manque de données, et les changements institutionnels fréquents. La deuxième difficulté est l'insuffisance des modèles de croissance économique modernes. En outre, les chercheurs souffrent également des problèmes économétriques généraux de la modélisation macroéconomique, par exemple le problème de petit échantillon, la faible identification et l'estimation sensible pour la stationnarité des séries et paramètres tronqués. Par conséquent, nous devons trouver et travailler dans un cadre approprié. Cette thèse montrera l'insuffisance des modèles de croissance économique dominante pour expliquer la croissance économique de la Chine et la nécessité de sortir du cadre néoclassique. L'analyse se tourne progressivement vers les approches marxistes et se concentre sur l'analyse des taux de profit. [...]Cette thèse propose quelques éléments de réflexion méthodologique sur le thème de la croissance de l’économie chinoise dans la longue période. À partir de données statistiques officielles chinoises retravaillées, nous reconstruisons des séries temporelles de stocks de capital physique les plus longues possibles, soit de 1952 à 2014, de façon à remonter au plus près de la date de formation de la République populaire et étendre cette base de données jusqu’au présent, pour tenir compte des derniers annuaires statistiques publiés en 2016. Nous testons ces nouvelles données afin d’estimer les contributions des facteurs de production à la croissance dans un cadre théorique néoclassique, en soulignant les limites de tels modèles – problématiques, car selon nous indépassables. [...] L'auteur a prédit les valeurs de certaines variables économiques de 2015. L'auteur prédit que le taux de profit continuera à baisser même s'il est déjà faible dans 2014. Si le taux de profit continue à baisser, les marxistes pourraient soutenir qu'une crise se produira à l'avenir. Toutefois, l'argument est cohérent avec les faits qu'une crise financière sur le marché boursier se produira en 2015 et 2016. La prévision pour la croissance économique est également très réussie. En outre, l'auteur a également étendu la décomposition économique des taux de profit. L'auteur a proposé trois décompositions différentes puis appliqué un filtre à ces composants. Les cycles économiques et les crises ont été confirmés avec une perspective marxiste reviséeThe rise of emerging economies and their increasing contributions to the world’s economy has led to the development of the science of economics. China is a typical representative of emerging market economies. This economic phenomenon pushes the development of economic growth theory, and the problems in empirical analyses also promote econometric techniques. Though China is still a developing country, China has successfully dragged itself out of absolute poverty. Is the technique of China’s economic development an alternative method for the struggle against the poverty of other poor countries? With the lack of modern international standard data, the empirical analyses of modern economic growth theories in the literature are generally focused on the period after the opening-up reform in 1978 or the period after the fiscal reform in 1993. In this thesis, the author attempts to extend the vision, by further analyzing China’s economy using modern economic approaches since the foundation of the People’s Republic of China in 1949. Alongside the wave of privatization, marketization, and liberalization in the countries of the former Soviet Union, socialist countries, and developing countries, China has also begun its economic reform since 1978 in which it has achieved great economic success. Chinese policymakers themselves contribute the rapid economic growth to the success of the institutional choice. For instance, Hu Jintao’s report at the 17th Party Congress (2007) has the following assertion: “To sum up, the fundamental reason behind all our achievements and progress since the reform and opening up policy was introduced is that we have blazed a path of socialism with Chinese characteristics and established a system of theories of socialism with Chinese characteristics.” However, what does the so-called “socialism with Chinese characteristics” really mean? How does it work on the path of economic growth? All those interesting questions incite this thesis to explore the answers. [...]
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Alvarez, Michelle. "PHYSICAL CHARACTERISTICS OF AN INDIVIDUAL: THE IDENTIFICATION OF BIOMARKERS FOR BIOLOGICAL AGE DETERMINATION." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4198.
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It is now a matter of routine for the forensic scientist to obtain the genetic profile of an individual from DNA recovered from a biological stain deposited at a crime scene. Potential contributors of the stain must either be known to investigators (i.e. a developed suspect) or the questioned profile must be searched against a database of DNA profiles such as those maintained in the CODIS National DNA database. However, in those instances where there is no developed suspect and no match is obtained after interrogation of appropriate DNA databases, the DNA profile per se presently provides no meaningful information to investigators, with the notable exception of gender determination. In these situations it would be advantageous to the investigation, if additional probative information could be obtained from the biological stain. A useful biometric that could provide important probative information, and one that may be amenable to molecular genetic analysis, is the biological age of an individual. The ability to provide investigators with information as to whether a DNA donor is a newborn, infant, toddler, child, adolescent, adult, middle-aged or elderly individual could be useful in certain cases, particularly those involving young children such as kidnappings or in providing additional intelligence during terrorist investigations. Currently no validated molecular assays exist for age determination. Biological human ageing can be defined by two distinct processes, degenerative and developmental ageing. The degenerative process of ageing is based on theories which identify an increase or decrease in physiological conditions with increasing age. In contrast, the developmental process of ageing is based on the theory that as individuals increase in chronological age, there will be subtle corresponding molecular based biological changes, each requiring genes to be expressed or silenced, indicative of that particular stage of life. We investigated the degenerative process of chromosomal telomere shortening, as well as the developmental process of gene expression profiling analysis, in an attempt to identify biomarkers of biological age in a self-renewing tissue such as blood. While telomere length analysis was an ineffective method for age determination; gene expression analysis revealed three gene transcripts expressed in an age-dependent physiological manner. These species namely- COL1A2, HBE1 and IGFBP3, were found to be expressed at elevated levels in younger individuals, newborns, or post-pubertal individuals, respectively. The biological process of hemoglobin switching was also investigated for the possibility of determining human age. While experimenting with the potential of using the gamma-hemoglobin chains, as newborn specific gene candidates, we serendipitously discovered four novel truncated transcripts, which we have termed HBG1n1, HBG1n2, HBG2n2 and HBG2n3; whose expression was restricted to whole-blood newborn samples and specific fetal tissues. The molecular origin of these transcripts appears to be at the RNA level, being produced by specific rearrangement events occurring in the standard gamma hemoglobin transcripts (HBG1 and HBG2), which yield these new isoforms that are expressed in a highly regulated tissue specific manner.Ph.D.
Department of Biomolecular Science
Burnett College of Biomedical Sciences
Biomolecular Sciences PhD
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Smit, Hendrik Christiaan. "Development of a time/temperature logging device to characterise the burning characteristics of biofuels." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6616.
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Thesis (MScFor (Forest and Wood Science))--University of Stellenbosch, 2011.ENGLISH ABSTRACT: A lab scale combustion unit was designed, in order to characterise the performance of various woody and wood-based biofuels commonly used for energy production, cooking and heating. The unit was constructed in a way that it could be repeatedly reused and provide similar testing conditions, such as airflow for all samples. The requirements were that it was big enough to contain a fire large enough to yield good time/temperature profiles and at the same time easy to handle, operate and clean. It also had to allow the insertion of the thermocouples and flue gas probe. Time / temperature profiles were obtained and O2, CO2 and CO levels in the flue gas determined for each biofuel. The samples consisted of the five most commonly used fuel wood species in the Western Cape, namely Rooikrans, Camelthorn, Bluegum, Black wattle and vine stumps and five processed products, namely wood pellets, wood briquettes, commercial charcoal, commercial briquettes and handmade briquettes. Combustion time/temperature profiles were obtained for all samples and characteristic values, such as the maximum temperature and coal temperature compared. This allowed an indication of which product performed better than others in the different combustion phases and is more suitable for different requirements, such as industrial heating, or domestic cooking. Even though Bluegum and Camelthorn performed best overall they were not necessarily suited, for example, for large scale industrial use. It was found that wood pellets and charcoal were the best biofuel for industrial purposes, whereas Rooikrans was found to be the best option for small scale use.
AFRIKAANSE OPSOMMING: ‘n Laboratoriumskaal verbrandingseenheid was ontwerp vir die toets en karakterisering van verskeie houtgebaseerde biomassa soorte algemeen in gebruik vir energie opwekking, kook en verhitting. Daar was besluit om ‘n eenheid te bou vir herhaalde gebruik wat die omstandinghede vir elke toets konstant kan hou, bv. ‘n damper om lugvloei deur die sisteem the beheer. Die eenheid moet groot genoeg wees om veilig ‘n groot genoeg vuur the bevat waarmee ‘n goeie tyd/temperatuur profiel verkry kan word, maar terselfdetyd klein genoeg wees om te hanteer, operateer en skoon te maak. Die eenheid moes ook voorsiening maak vir die insteek van die termostate en gas peilstif. Tyd/temperatuur profiele is verkry en O2, CO2 en CO vlakke in die uitlaatgas is bepaal vir elke bio-brandstof. Die monsters was saamgestel uit vyf van die mees algemeen gebruikte brandhout spesies in die Wes Kaap, naamlik Rooikrans, Kameeldoring, Bloekom, Swartwattel en wingerdstompies, asook vyf geprosesseerde produkte naamlik houtpille, houtbrikette, kommersiële steenkool, kommersiële brikette and handgemaakte brikette. Verbranding tyd/temperatuur profiele is verkry vir al die monsters en verteenwoord waardes is daarvan afgelees, bv. die maksimum temperatuur wat bereik is of die temperatuur waar die vlamme uitgesterf het en slegs koolhitte gemeet word. Hierdie profiele het dit moontlik gemaak om te identifiseer watter produk het beter gevaar as ander gedurende die verskillende verbrandingsfases en is beter gepas vir verskillende gebruike, bv. huishoudelike kook en verhitting. Resultate het gedui dat die Bloekom en Kameeldoring die beste gevaar het oor all die toetse heen, maar was nie noodwendig ideaal vir elke spesifieke doel nie. Dit was bevind dat die steenkool en houtpille die beste gepas is vir industriele gebruik en dat die Rooikrans beter geskik is vir huishoudelike en kleinskaalse gebruik.
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Prattley, Jennifer Anne. "The effect of partner and household characteristics on the continued employment of coupled older women in England." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/the-effect-of-partner-and-household-characteristics-on-the-continued-employment-of-coupled-olderwomen-in-england(08e26f8b-932a-48d4-898a-0605f4fcec7c).html.
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The economic wellbeing, physical and mental health of the ageing population in the United Kingdom is associated with continued participation in the labour force. Encouraging later life employment is therefore a key policy issue. Research into older person's employment trajectories is concentrated on male working patterns, and often takes an individualistic approach that does not account for the domestic context. Previous research on women's labour force participation has been informed by small scale qualitative studies that do consider the household domain but these findings cannot be generalized to the wider population. This research investigates the factors associated with the continued employment of women aged 50 to 59 using data from the English Longitudinal Study of Ageing (ELSA). Transition rates out of employment between 2001 and 2011 are modeled using multilevel discrete time event history specifications that permit the inclusion of time varying covariates. Retirement is characterized as an ageing process which allows the impact of predictors on transition rates to be assessed and measured as women approach state pension age. Alternative time structures are considered, with parameter estimates from an age baseline model compared with those from a time on study specification. Results illustrate the sensitivity of parameter estimates in discrete time event history models to the measurement of time, and emphasize the importance of adopting a time metric that is commensurate with the theoretical representation of retirement as a dynamic ageing process. The domestic context is realised as sampled women and their male partners are positionedwithin a household structure, and asymmetric effects of predictors on the transition rate of each gender are considered. Own poor health, caring responsibilities and a retired or inactive spouse accelerate labour market exit for women whilst high levels of accrued pension wealth predict earlier transitions for their male partners. The age of employment exit for females is independent of pension wealth, but pension resources do predict the retirement pathway taken following any transition that does occur. Women residing in the wealthiest households are more likely to report as voluntary retired prior to state pension age whilst those in the poorest of couples are at higher risk of following an involuntary pathway into an alternative inactive state. These findings emphasize the importance of conducting research into later life employment trajectories on a household, rather than individual, basis.