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1
Thomas, Nathaniel C. (Nathaniel Cabot). "Colliding bubble universes in eternal inflation." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65533.
Full textAbstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 48-50).
We briefly summarize arguments for inflation and discuss eternal inflation. We then discuss the motion of domain walls and null shells that form in two-bubble collision processes in both the global and in-bubble FRW coordinates. Comments are made regarding possible observational signals.
by Nathaniel C. Thomas.
S.B.
2
Bevin, Darren James. "The struggle for ascendancy : John Ruskin, Albert Smith and the Alpine aesthetic." Thesis, University of Exeter, 2008. http://hdl.handle.net/10036/65533.
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The thesis explores the work of two disparate figures, John Ruskin (1819-1900) and Albert Smith (1816-1860) who, together, helped transform the way the Alps were perceived in the mid nineteenth century. Both esteemed the Alps in their own way, although Ruskin’s cultural aestheticism contrasting markedly to the popular showmanship of Smith. Nevertheless, both Ruskin’s five-volumed Modern Painters (1843-1860), and Smith’s theatrical shows describing his ascent of Mont Blanc (1852-1858), contributed significantly to the growing popularity of the landscape resulting in the Alpine Club (1857) and the birth of modern tourism in the region. This work examines in detail the work and interests of both characters. This includes Ruskin’s drawings, art theory (especially in relation to his admiration of Turner), geological interests, religious convictions, and poetry. These reveal his desire to centre ideas of the sublime around his scientific interest in the area and the legacy of his Evangelical upbringing. The thesis investigates the tension between these elements. Smith’s climb of Mont Blanc (1851) and his subsequent shows highlighted his desire to thrill and entertain. For him, presentation of the Alps was a matter of showmanship and the thesis investigates his success, tracing its roots in elements of Victorian popular entertainment. Both Smith’s shows, and works like Of Mountain Beauty (Volume IV of Modern Painters (1856)), inspired many to explore the landscape for themselves. For Ruskin, this led to a decline in his interest in the Alps following the development of the rail network and the expansion of popular tourist sites, including his beloved Chamonix. For Smith, the public’s increasing familiarity with the region, and the popularity of other stories of Alpine ascents by members of the Alpine Club, led to a decline in interest in his shows by the end of the 1850s. Due to their interest in the region, the Romantic appreciation of the Alps in the early nineteenth century associated with theories of the sublime became a much more diverse phenomenon illustrating a number of key features of Victorian culture, including: the relationship of ‘high’ and ‘popular’ culture; the increasing influence of mass tourism; and the ways in which major figures in Victorian Britain explored and utilised foreign destinations. The thesis will also, from time to time, examine the relationship between cultural and visual forms and key elements in Victorian intellectual controversy, including the relationship of religion and science.
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Harkin, Claire. "Ecological interactions of an invading insect : the planthopper Prokelisia marginata." Thesis, University of Sussex, 2016. http://sro.sussex.ac.uk/id/eprint/65533/.
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The planthopper Prokelisia marginata Van Duzee is native to the eastern coast of North America, where densities on its foodplant, the cordgrass Spartina alterniflora, frequently exceed several thousand per square metre. It has little impact on its host plant in its native range where both species have co-evolved, however where the plant has been introduced and has had no recent exposure to the planthopper, it has a major impact and has been trialled as a biological control agent. P. marginata was recorded for the first time in Britain in 2008, where it feeds primarily on the widespread S. anglica, itself listed as one of the world's 100 worst invasive species, as well as its progenitors S. alterniflora, S. maritima and S. x townsendii. P. marginata appears to be in the successful early stages of invasion in Britain, having already spread extensively. Significantly outnumbering all other saltmarsh arthropod groups, it is benefitting from partial natural enemy escape, and a high proportion of macropterous individuals in all populations indicates strong potential for further range expansion. Utilising both glasshouse and field manipulations, I show that exposure to P. marginata has a significant negative impact on S. anglica, an interaction which has the potential to destabilise Britain's important saltmarsh habitat. I suggest that the four host species that occur in Britain represent a ‘gradient' of shared co-evolutionary history with the planthopper. I show that, whilst all species are negatively impacted by P. marginata exposure, S. alterniflora, the species with which it shares the longest co-evolutionary history, is the least affected. I further show that P. marginata exhibits a preference for, and performs better on, S. anglica. As S. anglica is by far the most abundant of the four Spartina species in Britain, these results suggest P. marginata may be undergoing rapid evolution in its new range to take advantage of this widespread host species, thereby maximising its potential for further range expansion.
4
Lind, Maja. "Strukturella och funktionella förändringar orsakat av multiple skleros." Thesis, Linnéuniversitetet, Institutionen för medicin och optometri (MEO), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-65533.
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Syfte: Syftet med denna studie var att undersöka hur ögats visuella och funktionella system påverkas av diagnosen MS, genom att undersöka färgseendet och synnerven. Denna studie ska utföras på lika många patienter med konstaterad MS som på patienter utan MS. Metod: I studien undersöktes 14 patienter, 7 med konstaterad MS och 7 kontrollpatienter utan MS. Deltagarnas ålder var mellan 41 och 56 år. Alla mätningar genomfördes monokulärt. De mätningar som utfördes var avstånd visus, färgseende test med hjälp utav Hardy Rand Rittler och Farnsworth’s Dichotomous test - D-15 test, kontrastseendetest med hjälp utav The Mars Letter Contrast Sensitivity Test och sist anvädes OCT för att få en 2 dimitsonell bild av det retinala nervfiber lagret (RNFL). Resultat: Resultatet av denna studie var förväntat och visar att patienter med MS har ett nedsatt färg- och kontrastseende men även också en förtunning utav det RNFL. Detta resultat styrks av tidigare studier. Den visar dock inga signifikanta skillnader mellan MS patienternas höger öga och kontrollpatienternas höger öga. Samma gäller för vänster. Slutsats: Detta arbete visar att optiker bör vara medvetna om dessa förändringar hos patienter med MS.
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Oytun, Erden. "Learners&." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/3/1063569/index.pdf.
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This study examines students�
perceptions about level of communication, online course support, satisfaction in a web enhanced course and students&
#65533
feelings about computers and the web. Addition to them gender differences in students&
#65533
perceptions were studied. The data were collected by using survey at the end of the term and analyzed by using descriptive statistical analyzing methods. Results showed that students&
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feelings about computers and the web were slightly positive. Students&
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perceptions about online course support were slightly positive. Students&
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perceptions were neutral about level of communication and satisfaction results. No difference has found in students&
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computer and the web feelings, level of communication, online course support and satisfaction results in terms of gender.
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Passier, Alyda M. "Social adjustment and language : a study of their relationship in learning disabled children." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65533.
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Tasel, Erdinc. "Gis-based Spatial Model For Wildfire Simulation: Marmaris &." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/3/1017821/index.pdf.
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Each year many forest fires have occurred and huge amount of forest areas in each country have been lost. Turkey like many world countries have forest fire problem. 27 % of Turkey�
s lands are covered by forest and 48 % of these forest areas are productive, however 52 % of them must be protected. There occurred 21000 forest fires due to several reasons between 1993 and 2002. It is estimated that 23477 ha area has been destroyed annually due to wildfires. The fire management strategies can be built on the scenarios derived from the simulation processes. In this study a GIS &
#65533
based fire simulating model is used to simulate a past fire occurred in Marmaris &
#65533
Ç
etibeli, Turkey, in August 2002. This model uses Rothermel&
#65533
s surface fire model, Rothermel&
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s and Van Wagner&
#65533
s crown fire model and Albini&
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s torching tree model. The input variables required by the model can be divided into four groups: fuel type, fuel moisture, topography and wind. The suitable fuel type classification of the vegetation of the study area has been performed according to the Northern Forest Fire Laboratory (NFFL) Fuel Model. The fuel moisture data were obtained from the experts working in the General Directorate of Forestry. The fire spread pattern was derived using two IKONOS images representing the pre- and post-fire situations by visual interpretation. Time of arrival, the rate of spread and the spread direction of the fire were obtained as the output and 70 % of the burned area was estimated correctly from the fire simulating model.
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Chahine, Layal. "Chemical analysis of the bulge globular cluster NGC 6553." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18752/.
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This work presents the analysis of a sample of 558 red giant stars located in
the direction of the Bulge globular cluster NGC 6553 and observed with the
multi-object spectrograph FLAMES at the Very Large Telescope of ESO.
According to their metallicity and radial velocity, we identified a sample of
245 stars likely members of the cluster. This represents the largest spectroscopic sample collected so far for NGC 6553.
The main goal was to obtain detailed abundances of NGC 6553 with the purpose of studying its chemical composition and investigate its relation with
the formation of the Bulge and with other Bulge clusters. In particular, the
study aimed at verifying the possible presence of iron spread, which would
have revealed a complex nature of NGC 6553, in spite of its standard classification as a genuine globular cluster. Moreover, we investigated, the presence
of chemical anomalies through the measure of the Mg and Al abundances
that show large star-to-star variations in most of the Galactic clusters.
The analysis has revealed that NGC 6553 has an iron abundance of [Fe/H]
= −0.13 ± 0.01 dex with no significant internal spread. This result indicates
that the cluster was not able to retain the supernovae ejecta in its potential
well.
The [Si/Fe] abundance ratio is enhanced with respect to the solar value, indicating that the cluster was formed from gas enriched by supernovae ejecta.
The [Si/Fe] measured in NGC 6553 is compatible with that measured in other Bulge stars.
Finally, NGC 6553 does not exhibit a Mg-Al anti-correlation and no significant spread in either Mg and Al. This suggests that the massive stars populating the cluster in its early stage did not reach in their interior burning
temperatures higher than ∼ 70 million K.
9
Call, Scott. "Long-Period Variable Stars in the Globular Cluster NGC 6553." Bowling Green State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1626973295690519.
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10
Ming, Lu. "Fabrication and applications of zinc indiffused channel waveguides in periodically poled lithium niobate." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/65503/.
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A comprehensive investigation of high conversion efficiency second harmonic generation (SHG) devices based on zinc indiffused channel waveguides in periodically poled lithium niobate (PPLN) is reported in this thesis. The thesis covers all stages from the production of PPLN by domain inversion on a micron scale through to optical testing. The factors affecting poling quality, such as crystal discrepancies from different suppliers, electrode materials, patterning quality, and mask design, are investigated and analysed systematically. In addition, back-switch poling methods (involving poling a sample completely and then re-poling) are demonstrated. By using optimized processes combining high electric-field poling with the use of conductive liquid gel as an electrode, we have successfully fabricated high quality PPLN samples with short periods (less than 6.5μm), magnesium doped PPLN (PPMgLN), periodically poled lithium tantalate (PPLT), and hexagonally poled lithium niobate (HexLN). for 1552.4nm with 81% conversion for a pulsed source being achieved. Studies of green and blue generation exposed limitations with the technique for shorter wavelength operation, and these are discussed and modelled.
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Kager, Elisabeth. "Pulsation Properties of Long Period Variable Stars in Globular Cluster NGC 6553." Bowling Green State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277148078.
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Oradei, Stefano. "Sostituzione dell'epicloridrina con derivati del glicerolo nella preparazione di prepolimeri per resine epossidiche bio-based." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6553/.
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La recente e innovativa filosofia della green chemistry che si sta diffondendo nell’industria chimica e l’incombente esaurimento di risorse fossili, stanno indirizzando la ricerca del settore chimico verso la realizzazione di processi sempre più sostenibili.
Tra i processi che necessitano maggiormente di questi cambiamenti, vi è quello della produzione di resine epossidiche che per il 90% è costituito attualmente da resine a base di bisfenolo-A, neuro tossico e pericoloso per la riproduzione umana, ed epicloridrina cancerogena; entrambi ottenuti da risorse fossili.
Per tali motivi, in questo elaborato si è cercato di sviluppare un processo di sintesi il più possibile “green”, per l’ottenimento di una molecola derivante da risorse rinnovabili, da sostituire all’epicloridrina nella sintesi di prepolimeri per resine epossidiche bio-based.
Lo sviluppo del lavoro è avvenuto tramite lo studio dei reagenti, solventi e parametri operativi, ottenendo il glicidil tosilato a partire da glicerolo e tosil cloruro attraverso una reazione in sistema bifasico, semplice dal punto di vista pratico e senza l’utilizzo di composti tossici.
Il glicidil tosilato è meno problematico in quanto meno volatile rispetto all’epicloridrina, ed inoltre le prove di reazione con il bisfenolo-A hanno portato all’ottenimento del prepolimero con rese maggiori rispetto a quelle ottenute nelle stesse condizioni con epicloridrina.
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Khan, Nawaz. "A cooperative framework for molecular biology database integration using image object selection." Thesis, Middlesex University, 2004. http://eprints.mdx.ac.uk/6553/.
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The theme and the concept of 'Molecular Biology Database Integration’ and the problems associated with this concept initiated the idea for this Ph.D. research. The available technologies facilitate to analyse the data independently and discretely but it fails to integrate the data resources for more meaningful information. This along with the integration issues created the scope for this Ph.D research. The research has reviewed the 'database interoperability' problems and it has suggested a framework for integrating the molecular biology databases. The framework has proposed to develop a cooperative environment to share information on the basis of common purpose for the molecular biology databases. The research has also reviewed other implementation and interoperability issues for laboratory based, dedicated and target specific database. The research has addressed the following issues: - diversity of molecular biology databases schemas, schema constructs and schema implementation -multi-database query using image object keying -database integration technologies using context graph - automated navigation among these databases This thesis has introduced a new approach for database implementation. It has introduced an interoperable component database concept to initiate multidatabase query on gene mutation data. A number of data models have been proposed for gene mutation data which is the basis for integrating the target specific component database to be integrated with the federated information system. The proposed data models are: data models for genetic trait analysis, classification of gene mutation data, pathological lesion data and laboratory data. The main feature of this component database is non-overlapping attributes and it will follow non-redundant integration approach as explained in the thesis. This will be achieved by storing attributes which will not have the union or intersection of any attributes that exist in public domain molecular biology databases. Unlike data warehousing technique, this feature is quite unique and novel. The component database will be integrated with other biological data sources for sharing information in a cooperative environment. This/involves developing new tools. The thesis explains the role of these new tools which are: meta data extractor, mapping linker, query generator and result interpreter. These tools are used for a transparent integration without creating any global schema of the participating databases. The thesis has also established the concept of image object keying for multidatabase query and it has proposed a relevant algorithm for matching protein spot in gel electrophoresis image. An object spot in gel electrophoresis image will initiate the query when it is selected by the user. It matches the selected spot with other similar spots in other resource databases. This image object keying method is an alternative to conventional multidatabase query which requires writing complex SQL scripts. This method also resolve the semantic conflicts that exist among molecular biology databases. The research has proposed a new framework based on the context of the web data for interactions with different biological data resources. A formal description of the resource context is described in the thesis. The implementation of the context into Resource Document Framework (RDF) will be able to increase the interoperability by providing the description of the resources and the navigation plan for accessing the web based databases. A higher level construct is developed (has, provide and access) to implement the context into RDF for web interactions. The interactions within the resources are achieved by utilising an integration domain to extract the required information with a single instance and without writing any query scripts. The integration domain allows to navigate and to execute the query plan within the resource databases. An extractor module collects elements from different target webs and unify them as a whole object in a single page. The proposed framework is tested to find specific information e.g., information on Alzheimer's disease, from public domain biology resources, such as, Protein Data Bank, Genome Data Bank, Online Mendalian Inheritance in Man and local database. Finally, the thesis proposes further propositions and plans for future work.
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Callum, Douglas R. "Soviet society and law : the history of the legal campaign to enforce the constitutional duty to work." Thesis, University of Glasgow, 1995. http://theses.gla.ac.uk/6553/.
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In both the 1936 and 1977 USSR Constitutions conscientious labour in socially useful activity was decreed to be a "duty and matter of honour" for every Soviet citizen. This study examines the various approaches adopted by successive Soviet leaderships in their determined efforts to reinforce that ethos. It focuses, in particular, on the so-called "anti-parasite" laws dating back to 1957, when as a part of Khrushchev's attempt to revive popular justice, several smaller republics experimented with enactments that permitted peer justice institutions in the form of amorphous social assemblies to exile "parasites" via a procedure which bypassed the existing court system. Special attention is devoted to the criticism lodged against the laws (during their adoption and spread to the other union republics in 1961) by members of the legal profession, who complained that the wide punitive given to the extra-judicial bodies and the attitudes and behaviour encouraged in them would erode the respect for "socialist legality" which they had been charged with enhancing in the minds of the mass public. Although as a result of such criticism, the Khrushchev regime modified the peer justice institutions in the early 1960's, and even though his populism was absorbed by or subordinated to the normative sector of social control in Brezhnev's legal policy, the study highlights the fact that complaints of abuses and inconsistencies in anti-parasite proceedings continued to be levelled against the prosecution process. This, it is contended, was due in large part to the extreme vagueness of the notion of social parasitism itself, although the lack of a precise and consistent definition of this peculiar offence (and of the key elements which were deemed to constitute it) was actually seen as necessary and even desirable since it allowed the authorities to use the anti-parasite legislation as a weapon of suppression against a broad spectrum of socially, politically, and economically inconvenient groups within Soviet society.
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Zuffrano, Annafelicia <1984>. "I regesti delle carte bolognesi dei secc. X-XII trascritti nei cartulari ecclesiastici del XVII-XVIII secolo. Edizione critica." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6553/.
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La ricerca ha come oggetto l’edizione critica di circa tremila regesti di documenti di area bolognese datati al X-XII secolo. I documenti sono stati trascritti tra il XVII e XVIII secolo in undici cartulari ecclesiastici, conservati presso l’Archivio di Stato di Bologna.
Il lavoro s’inserisce nel progetto di edizione delle carte bolognesi di epoca medievale in corso presso la cattedra di Paleografia latina e Diplomatica dell’Università di Bologna, attualmente incentrata sull’edizione delle carte del secolo XII. La ricerca si propone come strumento di supporto a tale progetto e come completamento delle carte già pubblicate: i cartulari, infatti, offrono spesso copie di documenti mancanti dell’originale o in cattivo stato di conservazione, e costituiscono l’unica traccia di una memoria storica altrimenti perduta.
Le raccolte esaminate si collocano a ridosso del periodo napoleonico, quando la maggior parte degli enti ecclesiastici venne soppressa e i loro beni incamerati dallo Stato; esse quindi rispecchiano la condizione dei principali archivi ecclesiastici cittadini dei primi secoli del Medioevo bolognese.
La ricerca è strutturata in una prima parte volta a definire in termini storico-diplomatistici la tipologia di fonte esaminata: oggi i cartulari non sono più intesi come semplici raccoglitori di documenti, ma come sistema organico di fonti in grado di far luce su aspetti importanti della storia dell’ente che li ha prodotti. L’indagine del loro contesto di produzione permette di comprenderne meglio le finalità, la forma e il valore giuridico.
Parte della ricerca è stata poi incentrata sullo studio delle ragioni che hanno portato gli istituti religiosi bolognesi alla redazione dei cartulari: a tal fine è stata esaminata la legislazione ecclesiastica cinque-settecentesca in materia di conservazione della documentazione e il rapporto della legislazione stessa con la prassi archivistica.
Infine è stata realizzata l’edizione critica vera e propria dei regesti, mirante a descrivere le caratteristiche principali di ciascun cartulario.The research aim is the critical edition of three thousand regesta of documents coming from the area of Bologna, dated between the 10th and the 12th century. The documents were copied between the 17th and the 18th century in eleven ecclesiastical cartularies, preserved at the State Archive of Bologna. This work is related to the critical edition project about the Carte bolognesi del secolo XII, in progress at the University of Bologna (sector of Palaeography and Diplomatics). The research wants to be a support to this project and a completion to the already published documents; cartularies are often the only trace of a historical memory otherwise lost, since they offer copies of documents lacking of their original form or in a bad state of conservation. The examined registers belong to the Napoleonic period, when the great part of the ecclesiastical bodies was suppressed and their goods were confiscated by the State; they reflect, thus, the condition of the main ecclesiastical city archives of the first centuries of the Bolognese Middle Age. The research is divided into a first part, whose aim is the historical and diplomatics definition of the cartularies: today they are no more considered like mere documents’ binders, but like structured sources collections casting light on important aspects of the body that produced them. The analysis of their production context allows understanding better their purposes and their juridical value. Furthermore, part of the research concerns the analysis of the reasons that led the Bolognese ecclesiastical bodies to the writing of cartularies: for this reason has been studied the 16th – 17th centuries ecclesiastical legislation concerning the documents’ preservation and the relationship between legislation and the archival procedure. Finally, it was realized the real critical edition of the regesta, with the description of the main characters of each cartulary.
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Trentacoste, Angela C. "The Etruscans and their animals : the zooarchaeology of Forcello di Bagnolo San Vito (Mantova)." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/6553/.
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The Etruscan city at Forcello was a prominent settlement in the Val Padana between the sixth and fourth centuries BC. Located at the northernmost periphery of Etruscan influence, Forcello lay along important trade routes connecting Etruria, the Adriatic, and central Europe. In addition to a rich array of material culture recovered from over thirty years of excavation, Forcello has also produced an exceptional quantity of animal remains, a volume that offers an unparalleled opportunity to study animal exploitation in Etruscan society. Using this abundant faunal assemblage as a starting point, this dissertation examines human-animal relationships at Forcello and more broadly within Etruscan Italy. To provide a foundation for further study, previous zooarchaeological research on northern and central Italy is synthesized into a single narrative. Faunal analysis at Forcello then reconstructs livestock husbandry strategies, assesses the contribution of wild taxa, and investigates the role of other animals not normally consumed. Results are compared regionally and chronologically to place Forcello in a broader context, building an inter-site picture of Etruscan animal relations. With the evolution of Etruscan cities in the Po Plain, livestock management strategies break from Bronze Age practices. Animal remains indicate a thriving network of northern Etruscan cities linked to, but partly independent from, central Italy, and northern Etruscan centers embrace swine husbandry earlier than Etruria. Within Forcello, faunal analysis illustrates well-developed husbandry systems and the presence of non-Etruscan culinary traditions. The recovery a significant number of perinatal human remains from the faunal assemblage is an important find. This project produces new data on subsistence strategy and urban life in an underrepresented region of Etruscan civilization, and it clarifies chronological and regional trends in animal management in Etruscan Italy during the first millennium BC, creating an integrated picture of Etruscan animal relationships that encompasses both Etruria and Etruria Padana.
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González, María del Carmen, and María Daniela Maldonado. "El ejercicio del derecho a participar de los niños/as en el ámbito escolar." Bachelor's thesis, Universidad Nacional de Cuyo. Facultad de Ciencias Políticas y Sociales, 2014. http://bdigital.uncu.edu.ar/6553.
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Esta investigación es producto de una profunda reflexión respecto de las
diferencias y similitudes que existen en las formas de participación, de los niños/as, en Escuelas Rurales y Urbanas en el Departamento de Rivadavia, Provincia de Mendoza; reflexión que se realizó desde la práctica como alumnas de la Carrera de Licenciatura en Trabajo Social, Facultad de Ciencias Políticas y Sociales, Universidad Nacional de Cuyo, y a partir de múltiples interrogantes que surgen de un campo de trabajo en el que se desempeñaron tareas de Promotoras Sociales en el Área de Niñez y Adolescencia de la Municipalidad de Rivadavia, Mendoza.
La principal inquietud, se centró en dar cuenta de las experiencias de
participación real y efectiva que tienen los niños/as en las escuelas estudiadas.
Se considera que la presente tesis es socialmente relevante, puesto que los
objetivos están orientados a identificar canales de participación a partir de las distintas experiencias vividas por los niños/as en sus lugares de formación, y a analizar y comprender el conocimiento o desconocimiento que tienen docentes, padres, y ellos mismos, sobre su derecho a la participación.Fil: González, María del Carmen. Universidad Nacional de Cuyo. Facultad de Ciencias Políticas y Sociales.
Fil: Maldonado, María Daniela. Universidad Nacional de Cuyo. Facultad de Ciencias Políticas y Sociales.
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Aerts, Jeroen Charles Joseph Hubert. "Spatial decision support for resource allocation integration of optimization, uncertainty analysis and visualization techniques /." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2002. http://dare.uva.nl/document/65537.
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Nieto-Hidalgo, Mario. "Gait analysis using computer vision for the early detection of elderly syndromes. A formal proposal." Doctoral thesis, Universidad de Alicante, 2016. http://hdl.handle.net/10045/65535.
Full textAbstract:
El objetivo principal de esta tesis es el desarrollo de un sistema de análisis de la marcha basado en visión que permita clasificar la marcha patológica. Este objetivo general se divide en tres subobjetivos específicos más concretos: definición formal de la marcha, especificación e implementación de un sistema de obtención de parámetros de la marcha basado en visión y clasificación de la marcha patológica. En el primer subobjetivo, definición formal de la marcha, nuestros esfuerzos consisten en obtener una definición de la marcha que incluya la visión por computador pero sin excluir otros métodos y que sea lo suficientemente abierta como para incluir todos los casos de marcha humana. La definición propuesta es la siguiente: "Gait is the anthropomorphic upright self-displacement, in an alternating stepping of two feet, with no additional fulcra, keeping at least a point of support at every time, on a horizontal or slightly inclined surface." A partir de esta definición, las variables que consideramos son tiempos y longitudes de paso y zancada, tiempos de apoyo monopodal y bipodal, velocidad, cadencia, etc... Para el segundo subobjetivo, especificación e implementación de un sistema de obtención de parámetros de la marcha basado en visión, nos centramos en el análisis de la marcha mediante visión por computador utilizando únicamente una cámara RGB, que obtenga imágenes laterales y frontales del sujeto. El algoritmo propuesto es capaz de extraer las variables de la marcha, establecidas en la definición del objetivo de especificación, con suficiente precisión, de modo que la marcha puede ser interpretada y clasificada. La decisión de limitar la infraestructura necesaria a una única cámara RGB, obedece al interés por abaratar los costes del sistema y que sea sostenible medioambientalmente, ya que no requiere de energía adicional para capturar la imagen, sino que utiliza la radiación lumínica que inunda el escenario, ya sea de forma natural o artificial. Este sistema actúa como interfaz de entrada del subobjetivo tres que son las variables de la marcha propuestas en el subobjetivo uno. Por tanto, el subobjetivo dos puede ser reemplazado por otro sistema basado en otro fenómeno como es el caso de un sistema inercial, siempre y cuando pueda proporcionar las variables definidas en el subobjetivo uno. El subobjetivo tres, clasificador de la marcha patológica, usa las variables proporcionadas por el sistema del subobjetivo dos para caracterizar la marcha y clasificarla. Mediante una serie de casos de entrenamiento, el sistema genera los modelos de marcha patológica y normal. A partir de estos modelos, el clasificador es capaz de determinar a qué modelo pertenece la entrada de parámetros de la marcha proporcionada por el subobjetivo dos. El objetivo de formalización nos ha llevado a profundizar en los aspectos conceptuales y procedimentales del conocimiento y de su creación, con la consecuencia de aportar sendas definiciones para problema y modelo, así como hallar una justificación formal, basada en la teoría de conjuntos, que confiere coherencia causal al método experimental. Además de encontrar formalmente la justificación causal del método científico, hemos podido encajar en ese marco formal los enfoques divide et vinces, model driven y top-down de resolución de problemas ingenieriles. Al tiempo que hemos encontrado que la técnica top-down de diseño es coincidente con el método científico de resolución de problemas, el método bottom-up es coherente con la implementación de prototipos, lo cual justifica la restricción de su utilización al diseño de instancias para las que ya se conoce solución.
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Llorca, Ripoll Rafael. "Los generales del Ejército español y su influencia en las circunstancias históricas. El enfrentamiento entre los generales absolutistas Prats y Sempere en 1823. Dos protagonistas olvidados." Doctoral thesis, Universidad de Alicante, 2015. http://hdl.handle.net/10045/65536.
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French, Katheryn Decker. "Use of dielectric material in muon accelerator RF cavities." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65530.
Full textAbstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 65-67).
The building of a muon collider is motivated by the desire to collide point-like particles while reducing the limitations imposed by synchrotron radiation. The many challenges unique to muon accelerators are derived from the short lifetime of the muons. The muons must be produced, then formed into a beam and accelerated to their final energy in less than a few milliseconds in the lab frame. One idea for accomplishing this is called a helical cooling channel (HCC), and requires placing the accelerating structure in a solenoid. The RF (radio frequency) accelerating structure in a muon accelerator should be short in the longitudinal direction, small enough in the transverse direction to fit inside the solenoids of the helical cooling channel, and have the highest possible electric field gradient. A RF cavity that meets these requirements is crucial to the development of a muon collider. There is an additional constraint if an existing source of RF power is to be used, as the frequency of the lowest RF cavity mode should match the frequency of the power source. At Fermilab, the klystrons produce RF power at 800MHz. The resonant frequency of an RF cavity depends inversely on the radius of the cavity, as well as the dielectric constant of the material within the cavity. A standard vacuum cavity with a resonant frequency of 800 MHz is too large to fit within the solenoids. This paper studies one method of avoiding this limitation by placing a dielectric material within the cavity. Another problem faced by a cavity within an HCC is the effect of the magnetic field. The solenoid field will serve to focus electrons emitted from the sides of the cavity, causing breakdown at lower electric fields than those possible without the solenoid. By inserting the dielectric at a high electric field point, electrons emitted from the wall behind the dielectric will be attenuated before they can avalanche and cause breakdown. The effect of this dielectric is modeled in Microwave Studio to determine the right size and shape for the dielectric given, and several prototype cavities are built and tested with a network analyzer. Our proof of concept experiment shows the feasibility of further developing the design of dielectric loaded RF cavities. A design for a cavity to be used at higher power is discussed, along with the testing procedures that will be followed.
by Katheryn Decker French.
S.B.
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Wong, Jessica Karen. "Optimizing a protein-RNA aptamer gene regulatory system using an engineered peptide library." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65513.
Full textAbstract:
Thesis (M. Eng.)--Harvard-MIT Division of Health Sciences and Technology, June 2011."June 2011." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 75-79).
For this project, N-terminal and C-terminal peptide library fusions were designed,bconstructed, and screened in order to improve the repression achievable with a novel gene regulatory system. This system, based on the interaction between proteins and proteinbinding RNA aptamers, takes advantage of the reversible interaction between TetR and its RNA aptamer binding partner 5-1.2 to modulate gene expression. With no tetracyclines present, TetR preferentially binds to aptamer 5-1.2 in the mRNA of a gene of interest with low nanomolar affinity and represses translation. Tetracyclines such as aTc induce a conformation change in TetR, prevent TetR binding to aptamer 5-1.2, and induce gene expression. Therefore, TetR binds aptamer 5-1.2 in an aTc-dependent manner, allowing inducible control of gene expression through the TetR-aptamer system. Initial characterization showed a regulatory range of 78% or approximately 5 fold in S. cerevisiae. The aim of this project is to improve repression levels achievable with the TetR-aptamer system by creating libraries of N-terminal and C-terminal peptide fusions to TetR and screening for increased repression in S. cerevisiae. The N-terminal and C-terminal library fusions were constructed from synthesized oligonucleotide fragments and a baseline TetR vector containing library insertions sites at both the N-terminal and C-terminal ends. The library fragments contain 20 random amino acids and a standard SSG linker peptide flanked by both single-cutting restriction enzyme sites and 40 bases of homology to the library insertion sites on the baseline TetR vector, allowing for construction by both restriction/ligation cloning in bacteria and yeast homologous recombination. Both libraries were constructed using restriction/ligation cloning after initial experiments determined optimized conditions for PCR, digest, purification, ligation, and electrocompetent bacterial transformation to achieve a maximum efficiency, fidelity, and purity. The N-terminal and C-terminal libraries produced have a combined diversity of 2.5x 105 variants. These library variants were screened using a plate-based assay with URA3 as a reporter gene. A selection with 5-fluoroorotic acid (5-FOA) was performed to identify library variants with improved repression. Since 5-FOA is a competitive inhibitor of URA3, cells that have URA3 expression cannot live on media containing 5-FOA. Preliminary experiments determined that 0.035% 5-FOA is the threshold for growth for the baseline
(cont.) TetR-aptamer system. Library variants containing 5-1.2-URA3 were grown on media containing a gradient of 5-FOA concentrations between 0.03% and 0.06% and compared to baseline TetR growth. Thirty-one library variants grew at a 5-FOA concentration greater than the baseline threshold for growth. These library hits underwent testing to further characterize their repression, inducibility, and library sequence. The 31 colony hits were streaked on discrete concentrations of 5- FOA to determine colony-specific 5-FOA thresholds and on uracil dropout media in the presence and absence of aTc to screen for preserved inducibility. Of the original 31 colonies, 25 passed both plate assays, growing on 0.045% 5-FOA and in a Tc-dependent manner on uracil dropout media. These 25 colonies were sequenced and analyzed using MEME to detect any conserved motifs. Twenty of the 25 sequenced colonies contained correct and unique libraries, 3 with N-terminal libraries and 17 with C-terminal libraries. Both the N-terminal and C-terminal library sequences had significant motifs. For the Nterminal sequences, all three contained the same 14 nucleotide motif, and 16 of the 17 Cterminal sequences also contained a 21 nucleotide motif. However, the unbiased selection for improved TetR functionality likely returned hits that use multiple mechanisms of action to enhance repression. Therefore, out of a diverse library pool containing 2.5x 105 variants, 20 unique library variants conferred increased repression on the TetR-aptamer system while maintaining inducibility in the presence of tetracycline.
by Jessica Karen Wong.
M.Eng.
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Gillespie, Christopher Whittlesey. "A general equilibrium analysis of climate policy for aviation." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65503.
Full textAbstract:
Thesis (S.M. in Technology and Policy)--Massachusetts Institute of Technology, Engineering Systems Division, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 85-92).
Regulation of aviation's contribution to the global problem of climate change is increasingly likely in the near term, but the method agreed upon by most economists-a multi-sectoral market-based approach such as a cap and trade system-is opposed by industry stakeholders. An efficient economy-wide policy would determine the optimal level of sectoral emissions reductions, but industry groups have instead proposed independent aviation-sector goals for carbon mitigation and technology adoption. This thesis asks the question: how much should airlines reduce their emissions, and which technologies will be necessary to achieve those reductions. In order to comprehend the problem of mitigation costs and outcomes within the context of the global economy, I introduce an aviation-resolved version of the MIT Emissions Prediction and Policy Analysis model; a computable general equilibrium model of the global economy. In EPPA-A, the social accounting matrix is re-balanced to include aviation, a non-unity income elasticity of demand is introduced, and substitution elasticity parameters are estimated. Additionally, I include an additional module to analyze the potential non-market impacts of government infrastructure on aviation emissions by explicitly modeling an advanced Air Traffic Control sector. Several policy scenarios are applied to the model including: an idealized economywide cap and trade system in each developed nation or region, and an aviation-sectoronly cap within an economy-wide cap, both with and without trading enabled between the aviation cap and the economy-wide cap. Each policy scenario is compared to a business-as-usual case, and relative welfare loss under each policy is calculated. The business-as-usual and economy-wide cap policies are also run with the advanced Air Traffic Control module enabled, and the efficacy is determined. I find that in the context of total economic welfare, the method of aviation regulation is of little significance; the differences in results among the different policy scenarios are very small (on the order of 0.002% in the U.S.). However, the price of aviation and sector output are more responsive. When trading between an aviationsector- only cap and the economy-wide cap is enabled, outcomes are practically identical. When trading is not allowed, the price of aviation increases 21.8%, and output falls 32.8% compared to the economy-wide policy-only case. I find that national welfare outcomes are sensitive to international trade, and border adjustments for aviation emissions are important. Finally, the efficacy of advanced Air Traffic Control infrastructure, and the economic welfare gained or lost, is sensitive to the parameter estimates which exhibit high uncertainty. I find that the low-efficacy parameters result in slightly lower fuel intensity, but are also net-welfare decreasing, while the high parameter estimates increase welfare, but result in an infeasible reduction in sectoral energy intensity.
by Christopher Whittlesey Gillespie.
S.M.in Technology and Policy
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Wei, Haofei. "Towards the fabrication of suspended superconductor-graphene-superconductor Josephson junctions." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65537.
Full textAbstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 61-63).
Graphene, a newly discovered material. has been the subject of much experimental and theoretical study due to its unique electronic behavior. In this thesis, I present, my work with graduate student Joel Wang to design and fabricate Josephson junctions on high quality graphene samples. Using niobium, with its high critical magnetic field., as the superconducting contact metal, along with high mobility suspended graphene samples, we hope to measure the behavior of graphene Josephson junctions in the quantum Hall regime. However, difficulties involved in the suspension and annealing processes of fabricating suspended graphene Josephson junctions have made it necessary for us to to develop a new fabrication process for making suspended Josephson devices. Over the course of this project, we have developed a fabrication process which uses a flip-chip bonder and graphene deposited on PMMA films to make suspended graphene samples. With these suspended flakes, we have produced niobium-graphene-niobiun Josephson junctions which exhibit multiple Andreev reflection at temperatures of 4 K. and a Dirac peak near -0.4 V, all without any annealing of the graphene. We have also developed an annealing and lithography process which can clean graphene and preserve its cleaness during the rest of the fabrication process. This annealing process has yielded suspended graphene samples with mobility upwards of 200, 000 cm 2 V-i s-1 comparable with high mobility flakes presented in literature.
by Haofei Wei.
S.B.
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Van, Tilburg Ken. "Identifying boosted objects with N-subjettiness and linear k-means clustering." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65536.
Full textAbstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics; and, (S.B.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 57-59).
In this thesis, I explore aspects of a new jet shape - N-subjettiness - designed to identify boosted hadronically-decaying objects (with a particular focus on tagging top quarks) at particle accelerators such as the Large Hadron Collider. Combined with an invariant mass cut on jets, N-subjettiness is a powerful discriminating variable for tagging boosted objects such as top quarks and rejecting the fake background of QCD jets with large invariant mass. In a crossover analysis, the N-subjettiness method is found to outperform the common top tagging methods of the BOOST2010 conference, with top tagging efficiencies of 50% and 20% against mistag rates of 4.0% and 0.19%, respectively. The N-subjettiness values are calculated using a new infrared- and collinear-safe minimization procedure which I call the linear k-means clustering algorithm. As a true jet shape with highly effective tagging performances, N-subjettiness has many advantages on the experimental as well as on the theoretical side.
by Ken Van Tilburg.
S.B.
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Sterk, Joseph P. (Sterk Joseph Phillip). "Assessing the impact of tumor evolution on oncology drug development and commercialization." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65523.
Full textAbstract:
Thesis (S.M.)--Harvard-MIT Division of Health Sciences and Technology, 2011.Vita. Cataloged from PDF version of thesis.
Includes bibliographical references (p. 91-97).
This thesis investigates the commercial viability of developing and commercializing targeted oncology drugs directed at a specific tumor mutation instead of all forms and mutations of a single target. While oncologic drugs targeted to aberrant or overexpressed pro-proliferative proteins have revolutionized cancer treatment, tumors treated for long periods may mutate over time, gain resistance to these drugs and proliferate rapidly again. I hypothesize that drugs developed to inhibit specific resistant tumor genotypes can be commercially viable from a pharmaceutical manufacturer's perspective. To assess this hypothesis empirically, I construct a patient flow model in order to quantify the treatment of CML, a relatively rare and indolent hematological malignancy with extensive clinical data available and well-delineated disease phases and response criteria. To represent the rate of diagnosis, patients are "added" to the model every month, and thereafter there is a probability that a patient may either 1) become sufficiently intolerant to his drug in order to discontinue treatment, 2) fail to respond to treatment but remain in the same disease phase, 3) fail to respond to treatment and progress to the next phase of disease, or 4) adequately respond to treatment and stay on the same drug in the same phase. Patients that fail to respond (categories 2 and 3 above) have a chance of manifesting a resistance mutation that is adequately controlled by a hypothetical drug (in addition to their current treatment) but is otherwise untreatable. The aim of this analysis is to track the number of patients that accrue the chosen resistance mutation and thus would be good candidates to receive the hypothetical drug. Patient treatment rates are converted to sales figures, and are weighed against clinical development costs, timelines, and probabilities to determine the net present value (NPV) of a project to develop the hypothetical drug. In addition, parameters are varied in order to conduct a sensitivity analysis and determine the "boundary conditions" that make a drug profitable or unprofitable. To supplement the model results and confirm the model dynamics, I interviewed investment analysts, clinical oncology thoughtleaders, academic cancer researchers and clinical, commercial and regulatory personnel from drug manufacturers to gauge their opinions on the CML market and the hurdles particular to developing drugs aimed at resistant genotypes. The conclusion I reach from this analysis is that development of a specific mutation-directed therapy for resistant CML is unlikely to be profitable. Given the significantly smaller patient population, favorable conditions in pricing and clinical development would be required to make the hypothetical candidate even marginally profitable.
by Joseph P. Sterk.
S.M.
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Mahajan, Raghu. "Fermions at finite density in the nonrelativistic gauge/gravity duality." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65531.
Full textAbstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 49-52).
The AdS/CFT correspondence has provided a new tool to investigate strongly correlated systems in condensed matter physics. This thesis presents the computation of retarded fermion Green functions at finite density and zero temperature in the nonrelativistic gauge/gravity duality. We find evidence of Fermi surfaces and investigate their properties. We show that the near-horizon scaling dimension, an important quantity that controls the low-energy excitations of the theory, depends on the momentum along the "extra" direction in nonrelativistic gauge/gravity duality.
by Raghu Mahajan.
S.B.
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Chen, Xiaoji S. M. Massachusetts Institute of Technology. "Seeing differently : cartography for subjective maps based on dynamic urban data." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65543.
Full textAbstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 65-66).
What should maps look like in the information age? This thesis proposes dynamic subjective map - maps that are tailored to the context of the observer - to digitally bridge the gap between man in cities and massive urban data. Maps affect the way people see the world profoundly. Throughout history, maps have been evolving from subjectivity and ideals towards objectivity and accuracy. Cartography has become a precise science that excludes much inspiring narrative, which was commonly seen in ancient maps. On the other hand, during the past two decades, the nature of cities has been undergoing an enormous shift powered by information technology that avails a vast variety of data by tracking people's behavior in the city, such as GPS navigation based on real-time traffic status. As a result, the work, travel and social patterns of urban residents have been gradually transformed. Despite availability of such data, there is no satisfying means to help people in the city interpreting and visualizing them effectively. The maps that designers produce today are still static geographic representations, paying little attention to human activity. The dynamic subjective map in this thesis explores ways to embed narrative and meaning into urban data visualization, and uses animation and interaction to create a more personalized cartography. In this map, space is no longer defined by geographical features alone, but with human-related factors such as transportation time, population density or social connections as well. The thesis starts by looking into the origin and purpose of dynamic subjective maps. Then it describes the principles and methodologies used in producing them. A selection of case studies is used to demonstrate the design process and implementation techniques of such maps in two typical contexts: isochronic maps and relevance-equalizing maps. The dynamic subjective maps presented in this thesis show possibilities of representing cities through the use of the latest computation technology from perspectives that are rarely seen before. The work also delivers a set of toolkits that are useful in visualizing massive urban data streams and is expected to inspire planners, architects and the general public to reflect upon their understanding of cities.
by Xiaoji Chen.
S.M.
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Perko, Ashley Nicole. "The Omniscope : mapping the Universe in 3D with neutral hydrogen." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65534.
Full textAbstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 57-58).
21 cm tomography has the potential to become the most powerful cosmological probe yet. The Omniscope is a novel radio telescope being built to take advantage of this signal. This thesis describes my work on integrating, testing, and characterizing all modules of the Omniscope and identifying opportunities for further improving their sensitivity.
by Ashley Nicole Perko.
S.B.
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Tolley, Emma Elizabeth. "Monte Carlo event reconstruction implemented with artificial neural networks." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65535.
Full textAbstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 41).
I implemented event reconstruction of a Monte Carlo simulation using neural networks. The OLYMPUS Collaboration is using a Monte Carlo simulation of the OLYMPUS particle detector to evaluate systematics and reconstruct events. This simulation registers the passage of particles as 'hits' in the detector elements, which can be used to determine event parameters such as momentum and direction. However, these hits are often obscured by noise. Using Geant4 and ROOT, I wrote a program that uses artificial neural networks to separate track hits from noise and reconstruct event parameters. The classification network successfully discriminates between track hits and noise for 97.48% of events. The reconstruction networks determine the various event parameters to within 2-3%.
by Emma Elizabeth Tolley.
S.B.
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Sahin, Timur Cemal. "Interactions of neutrons with silicon CCD chips." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65532.
Full textAbstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 43).
Dark matter makes up approximately 22% of the energy density of the universe and as much as 83% of its matter composition. Despite its ubiquitous nature, it remains incredibly difficult to detect due to the weakness of its interaction with the regular matter. The Dark Matter Time Projection Chamber (DMTPC) is an experiment that searches for traces of ionization created by Weakly Interacting Massive Particles (WIMP's). The detector uses a charge coupled device (CCD) camera to image the ionization signal created in the detector gas. The CCD chip itself is also sensitive to interactions with the WIMP's and the background radiation. In this thesis I explore the contributions these interactions may have on the DMTPC experiment. First, I develop an algorithm that filters out the electronic noise in the CCD chip such that the remaining images contain true ionization events in the chip. Second, I study insidious effects of neutron interaction with the CCD chip. I develop a GEANT4 based Monte Carlo simulation and set up an experiment that uses a neutron source with a known energy and measure the energy deposition in the chip. The energy spectrum agrees with the prediction based on the elastic scattering kinematics and the silicon ionization rate thus providing an energy calibration. Finally, I measure the level of background in the CCD chip coming from the inside of the camera, I set up an experiment in which outside neutrons are shielded with layers of plastic material and x-rays are suppressed with lead bricks surrounding the camera. Cosmic muons create particle showers that can also interact with the CCD chip so I build an active shield using a pair of scintillating paddles. I find that background interactions with silicon produce CCD signals that are small enough to be eliminated by existing DMTPC cuts on interaction range.
by Timur Cemal Sahin.
S.B.
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Akbarzadeh, Masoud S. M. Massachusetts Institute of Technology. "Hydropower cities : a new candidate for eco-utopia." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65539.
Full textAbstract:
Thesis (M. Arch.)--Massachusetts Institute of Technology, Dept. of Architecture, 2011.Cataloged from PDF version of thesis.
Includes bibliographical references (p. [83]).
The increasing need for water due to incessant growth of population of the world makes it imperative to build water reservoirs in different location of the world. Water reservoirs most of the time are used as a mean to generate energy. Hydropower energy is one of most efficient and renewable ways of energy production which has negative other implications on human and natural environments. Design and construction of large scale dams provide regional water and global energy support for communities while deprave some people from their home lands and number of environmental effects. In this thesis, the new paradigm of planning dams and related infrastructures are investigated to not only provide the water and energy for the local people, but to lessen the environmental effects of such infrastructures. In each step through this thesis an architectural proposition would be provided and its flaws and effects would be considered to provide better environment for its inhabitants and natural eco system. It is worth noting that the propositions in this architectural design research are schematic and need further consideration and investigation by professionals in related areas. At the end, a specific site in Senegal River valley would be chosen for the application of the last scheme with consideration of the local characteristics of the site and its requirements.
by Masoud Akbarzadeh.
M.Arch.
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Westerdale, Shawn (Shawn S. ). "Designing and testing the neutron source deployment system and calibration plan for a dark matter detector." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/65538.
Full textAbstract:
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, June 2011."June 2010." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 113-116).
In this thesis, we designed and tested a calibration and deployment system for the MiniCLEAN dark matter detector. The deployment system uses a computer controlled winch to lower a canister containing a neutron source into the detector where the neutron source pulses to produce calibration data. The winch then pulls the neutron source back out of the detector. We found that the deployment system position is precise to under 0.05 cm, one tenth of the minimum required precision. We designed a canister that will hold the neutron source during the calibration process. The canister will contain a dielectric gel to thermally and electrically insulate the high voltage electronics and the neutron source from the rest of the detector. We calculated the equilibrium temperature change of the calibration neutron source when it is turned on and found that the temperature increases by 92.6+isi K, corresponding to a rise in the dielectric gel height of 1.501i.9 cm. This temperature change is within the service temperature range of the dielectric gel; however, a more thermally conductive gel could still be used to reduce the temperature increase. We simulate the background external neutrons in MiniCLEAN and find that the addition of an air-filled calibration tube to the basic MiniCLEAN design has little effect on the external neutron background rate. Lastly, we simulate the calibration process in order to determine how long we must calibrate MiniCLEAN in order to obtain the desired 5% statistical precision on measurements of the calibration neutron-induced recoil spectrum. We found that a minimum of 2.48x 106 neutrons are needed to measure the total counts in the region of interest in energy to 5% (corresponding to a pulse mode calibration time of 124 seconds assuming that neutrons are produced at a rate of 105 per second), and 2.02x 107 neutrons are needed to achieve 5% measurements of the energy spectrum with 2 KeVee binning in the region of interest (corresponding to a time of 1005 seconds).
by Shawn Westerdale.
S.B.
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Conocimiento, Dirección de Gestión del. "Music Online: Listening." Alexander Street, 2004. http://hdl.handle.net/10757/655363.
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Conocimiento, Dirección de Gestión del. "ScienceDirect." Elsevier, 2004. http://hdl.handle.net/10757/655383.
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Clavijo, Guerra Alejandro. "Desarrollo de un modelo de estimacion de costos para una empresa productora de oro." Master's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/655323.
Full textAbstract:
Para el Perú, la minería es un pilar importante en la economía. Según el Boletín Estadístico del MEM del mes de julio, el rubro minero sigue siendo el principal generador de divisas al alcanzar el 61% de participación en el comercio exterior peruano; luego del inicio de la Fase I de reactivación económica, por efectos de la pandemia COVID 19.
Los procesos mineros presentan muchas particularidades; por las características de los yacimientos y los metales obtenidos. Esta diversidad se ve reflejada en los sistemas de medición de desempeño, que se implementan a medida de cada organización.
El desarrollo alcanzado por las tecnologías de información, nos ha posibilitado contar con una diversidad de soluciones, que se combinan con el conocimiento “in house” para lograr herramientas de medición, que permiten una oportuna toma de decisiones.
El desarrollo del presente trabajo tiene como objetivo el “DESARROLLO DE UN MODELO DE ESTIMACION DE COSTOS PARA UNA EMPRESA PRODUCTORA DE ORO”; que responda a las diversas inquietudes que se formulan al presentarse desviaciones en los resultados operativos, reflejados en términos económicos.
Materializar esta propuesta, facilitará a los funcionarios y líderes de la organización, el cambio de estrategias operacionales, disponiendo de manera eficiente el uso de los recursos; así como encontrar nuevas oportunidades de mejora, con el análisis de las variaciones en cada eslabón de la cadena productiva.
Dada la actual coyuntura económica, la propuesta se desarrolla con recursos propios, generándose un importante beneficio económico, que se analiza en el capítulo 4 del presente trabajo.For Peru, mining is an important pillar in the economy. According to the MEM Statistical Bulletin for July, the mining sector continues to be the main generator of foreign exchange, reaching a 61% participation in Peruvian foreign trade; after the start of Phase I of economic reactivation, due to the effects of the COVID 19 pandemic. The mining processes present many peculiarities; by the characteristics of the deposits and the metals obtained. This diversity is reflected in the performance measurement systems, which are implemented tailored to each organization. The development achieved by information technologies has enabled us to have a variety of solutions, which are combined with knowledge "in house" to achieve measurement tools that allow timely decision-making. The development of this work has as objective the "DEVELOPMENT OF A COST ESTIMATING MODEL FOR A GOLD PRODUCING COMPANY"; that responds to the various concerns that are raised when deviations occur in operating results, reflected in economic terms. Materializing this proposal will make it easier for the officials and leaders of the organization to change operational strategies, efficiently arranging the use of resources; as well as finding new opportunities for improvement, with the analysis of the variations in each link of the production chain. Given the current economic situation, the proposal is developed with its own resources, generating an important economic benefit, which is analyzed in Chapter 4 of this paper.
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Mendoza, Castillo José Luis, and Carbajal Manuela Stephania Vilchez. "Análisis del concreto con sustitución parcial del agregado fino por agregado de polietileno de alta densidad (HDPE) para concreto no estructural en Lima." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/655330.
Full textAbstract:
En los últimos años el mundo atraviesa una gran crisis ecológica, a fin de contribuir con la reducción de los niveles de desechos, en la tecnología del concreto existe la propuesta de usar los residuos plásticos como agregados en la fabricación de concreto.
Por tal motivo, el objetivo de este trabajo es demostrar que la incorporación de agregado de HDPE como sustitución parcial del agregado fino mejorará las propiedades que incrementan la durabilidad del concreto.
Esta investigación comprende una metodología experimental que va desde la preparación del HDPE como agregado fino, análisis del agregado plástico, el diseño de mezclas del concreto patrón y concreto de estudio con 10%, 20% y 30% de reemplazo parcial del agregado fino, ensayos físicos y mecánico a un muestreo de 64 probetas, hasta el análisis de los resultados.
De la obtención de resultados, se observó que la muestra que tiene un 30% de reemplazo reduce al 86% el peso unitario comparado a la muestra patrón, es decir que tiene una variación inversamente proporcional a la cantidad porcentual de reemplazo. Con respecto a las propiedades mecánicas; la resistencia a la compresión se incrementa hasta en 17.7% con la muestra del 20% de reemplazo del agregado fino por HDPE, la resistencia a la tracción y flexión se incrementan hasta 60.76% y 13.7% respectivamente con relación a la muestra con un 30% de reemplazo parcial del agregado fino por HDPE. En la resistencia a la carbonatación no se observó ningún cambio ni variación en el concreto patrón y las distintas combinaciones.In recent years, the world is going through a great ecological crisis, in order to contribute to the reduction of waste levels, in concrete technology there is a proposal to use plastic waste as aggregates in the manufacture of concrete. For this reason, the objective of this work is to demonstrate that the incorporation of HDPE aggregate as a partial replacement for fine aggregate will improve the properties that increase the durability of concrete. This research includes an experimental methodology that ranges from the preparation of HDPE as fine aggregate, analysis of the plastic aggregate, the design of mixtures of the concrete pattern and study concrete with 10%, 20% and 30% partial replacement of the fine aggregate, tests physical and mechanical to a sampling of 64 specimens, until the analysis of the results. From the obtaining of results, it is realized that the sample that has a 30% replacement reduces the unit weight to 86% compared to the standard sample, that is, that it has a variation inversely proportional to the percentage replacement amount. Regarding the mechanical properties, the compressive strength increases up to 17.7% with the sample of 20% replacement of fine aggregate by HDPE, the tensile and flexural strength increase up to 60.76% and 13.7% respectively in relation to the sample with 30% partial replacement of fine aggregate by HDPE. In the resistance to carbonation, no change or variation is recorded in the pattern and the different combinations.
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Cornejo, Falcon Brenda Anapaula, and Pérez Bryan Aarón Mañuico. "Análisis del comportamiento de barreras flexibles mediante la variabilidad de parámetros de energía y localización como medida de diseño para la contención de flujo de detritos en la quebrada primero de mayo –Lurigancho Chosica." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/655331.
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La presente tesis aplica un análisis de tendencias asociados a la variación de la energía de impacto y localización que tienen las barreras flexibles ante eventos de flujos de detritos. Esto para establecer y considerar la variabilidad anteriormente mencionada como un parámetro de diseño para barreras flexibles y, por consiguiente, desarrollar una propuesta de ingeniería eficaz que permita maximizar el comportamiento de las barreras flexibles y sea aplicable a diferentes proyectos que consideren como propuesta estructuras de contención dinámica para frenar el impacto de los flujos de detritos. Todo esto tomando en cuenta los parámetros geotécnicos e hidro morfológicos de la zona, con principal importancia en la pendiente y la precipitación como desencadenante de eventos de flujos de detritos. El estudio se desarrolló en la quebrada Primero de Mayo ubicado en el distrito de Lurigancho, departamento de Lima, Perú. Tomando en cuenta que es una quebrada sin presencia de estructuras de contención previas y con un crecimiento poblacional no controlado que aumenta el riesgo de pérdidas económicas y sociales en la zona. Las simulaciones del comportamiento de las barreras flexibles ante diferentes situaciones de energía y localización se desarrollaron en el software Rocfall para establecer el número de barreras necesario para contener el flujo de detritos de la zona y plantear cuatro diferentes iteraciones para el estudio.The proposal of a probabilistic factor is presented to determine the percentage of failure that can occur in shallow foundations, in our case footings. In this article we will present a comparison between the safety factor (F.S), defined by the standard E050 Soils and Foundations, and the probability of failure. This method will be executed through the simulation of input data, such as specific weight, cohesion, angle of friction and load stress. For this simulation process, the Monte Carlo method will be applied. Once the soil resistance values have been obtained, considering its normal distribution and the stress, the probabilities of failure will begin to be analyzed using the strength and stress density curves. Finally, we will analyze the relationship that will occur between the F.S and the probability of failure to observe the behavior when increasing the parameters for resistance.
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Santos, Estrada Arnold Junior. "Aplicación del bioconcreto para reparar agrietamientos de los decantadores de la planta de tratamiento de agua La Atarjea - Lima." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/655332.
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El presente proyecto de investigación se realizó en los laboratorios de: Ingeniería Civil - UPC, y laboratorio biológico - UNMSM; con el objetivo claro de experimentar y confirmar la hipótesis inicial: “Las bacterias Bacillus Subtilis añadidas en el diseño de mezcla del concreto (bioconcreto), es capaz de producir calcita, por ende, autoreparar los agrietamientos de los decantadores de la Atarjea”.
El concreto tarde o temprano se agrieta por diversas causas, ya sea, por el clima, por la humedad que existe en la ciudad donde se encuentra la obra, por el pH, por movimientos sísmicos de moderada intensidad, etc.
Esta investigación, se enfocó, a reparar con un material de construcción innovador (bioconcreto) los agrietamientos de los decantadores de la Atarjea, los cuales, son los que más gastos ocasionan en reparaciones.
Todos los datos para el desarrollo de esta investigación se consiguieron mediante la realización de diseño de protocolos: parte biológica (bacterias: aislamiento, cultivo, reproducción, esporulación), parte ingenieril (diseño de mezcla y ensayos de concreto: resistencia a la compresión, granulometría, humedad, etc.).
El bioconcreto se elaboró para un diseño de mezcla con f´c = 210 kg/cm2, con slump de 4'' y cumpliendo la Norma ACI 211.
Con esta investigación se logró verificar, que el bioconcreto, llega a su resistencia a partir de los 28 días, y autorepara las fisuras y las grietas eficazmente, con una tendencia a disminuir el ancho en 0.20 mm por mes, esto quiere decir, que la hipótesis inicial, es factible y viable.This research project was carried out in the Civil Engineering laboratories - UPC, and the biological laboratory – UNMSM; with the clear objective of experimenting and confirming the initial hypothesis: “The Bacillus Subtilis bacteria added in concrete mix design (bioconcrete), is capable of producing calcite, accordingly, self-repair the cracking of Atarjea decanters. The concrete sooner or later crack due to various causes, be it due to the climate, the humidity, that exists in the city where the work is located, due to the pH, due to moderate intensity seismic movements, etc. This investigation was focused on repairing with an innovative construction material (bio-concrete) the cracks in the decanters of the Atarjea, which are the ones that cause the most expenses in repairs. All data for the development of this research were obtained through the design of protocols: biological part (bacteria: isolation, culture, reproduction, sporulation), engineering part (mix design and concrete tests: resistance, granulometry, humidity, etc.) The bio concrete was made for a mix design with f´c = 210 kg/cm2, with slump of 4'' and complying with the standard ACI 211. With this investigation it was possible to verify, that bio concrete, reaches its resistance after 28 days, and self-repair fissures and cracks effectively, with a tendency to decrease the width of 0.20 mm by month, this means, that the initial hypothesis is feasible and viable.
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Briceño, Yañez Stephanie Matilde. "Factores del Web Experience y la relación con la intención de compra online por millennials en sitios web de las aerolíneas en Lima Metropolitana." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/655033.
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El contexto de la presente investigación muestra una creciente atracción por los usuarios millennials por realizar compras de tickets aéreos en sitios web de aerolíneas en Lima Metropolitana. Asimismo, se observa un notable cambio en el comportamiento del consumidor, el cual se ve influenciado por distintos factores de la Experiencia Web. Por lo tanto, el objetivo es analizar los factores del Web Experience (usabilidad, interactividad, confianza, estética y marketing mix) influyen en la intención de compra online de tickets aéreos por millenials en los sitios web de aerolíneas en Lima Metropolitana. Se desarrollará una investigación cuantitativa con una muestra no probabilística de 250 jóvenes millennials de Lima Metropolitana que hayan comprado por lo menos un ticket aéreo en un sitio web de aerolínea en el último año.The context of the present research shows a growing attraction for millennial users to make purchases of air tickets on airline websites in Metropolitan Lima. Likewise, a notable change in consumer behavior is observed, which is influenced by different factors of the Web Experience. Therefore, the objective is to analyze the Web Experience factors (usability, interactivity, trust, aesthetics and marketing mix) that influence the online purchase intention of airline tickets by millennials on airline websites in Metropolitan Lima. A quantitative research will be carried out with a non-probabilistic sample of 250 young millennials from Metropolitan Lima who have bought at least one air ticket on an airline website in the last year.
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Serrano, Miranda Lucio Enrique. "Representación de la sexualidad en la serie Sex Education desde la perspectiva de los usos y gratificaciones en los adolescentes." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/655133.
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El presente trabajo analiza la relación existente entre la serie “Sex Education”: un producto audiovisual que plasma una realidad en donde los adolescentes realizan constantes cuestionamientos en relación a su etapa de vida sexual y su vinculación con los usos y gratificaciones. El objetivo principal del presente documento es identificar las principales características que vinculan al espectador joven con la serie. Asimismo, esta investigación busca identificar la forma en la que los usos y gratificaciones guardan relación con la serie de ficción Sex Education, en la cual se puede observar personajes de mentalidad abierta capaces de derribar antiguas preconcepciones sobre sexo.This work analyzes the relationship between the series "Sex Education": an audiovisual product that captures a reality where adolescents constantly question their stage of sexual life and its connection with uses and gratifications. The main objective of this document is to identify the main characteristics that link the young viewer with the series. Likewise, this research seeks to identify the way in which uses and rewards are related to the fiction series Sex Education, in which it is possible to observe open-minded characters capable of breaking down old preconceptions about sex.
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Silva, Laura Stéphannie Palmira, and Carranza Angelita Geraldine Velarde. "Análisis de los factores individuales de los estudiantes de Traducción e Interpretación Profesional de la Universidad Peruana de Ciencias Aplicadas en los Talleres de Interpretación 1 y 2." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/655233.
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A lo largo del proceso de aprendizaje de la interpretación, hay factores que pueden influir en la práctica interpretativa de los estudiantes. Por un lado, se encuentran factores relacionados con el nivel de dificultad del texto, la velocidad del discurso, la longitud del discurso, las variantes dialectales, entre otros. Por otro lado, están los factores cognitivos. Sin embargo, existen otros factores relacionados con las emociones, los rasgos de personalidad y las motivaciones respecto a las asignaturas académicas. A estos factores se les conoce como factores individuales. Por ello, el presente estudio busca analizar los factores individuales de los estudiantes de Traducción e Interpretación Profesional de la Universidad Peruana de Ciencias Aplicadas (UPC) en los Talleres de Interpretación 1 y 2. La investigación utilizará un enfoque mixto, cuantitativo y cualitativo; por lo tanto, se pretende aplicar las técnicas de encuestas y grupos focales. Para abordar el primer subobjetivo (factores afectivos internos y externos), se utilizarán los cuestionarios modificados y adaptados de Chiang y Beck: Anxiety and Interpretation Learning Questionnaire de Chiang (2006) e Inventario de Ansiedad de Beck (BAI, 1988). Para el segundo y tercer subobjetivo (experiencias sobre los factores afectivos y las motivaciones), se creará una guía de grupo focal. En este sentido, los estudiantes de tales talleres son los sujetos de estudio de la presente investigación.Throughout the process of learning how to interpret, there are some factors that can influence students' interpretive practice. On the one hand, there are factors related to the text level of difficulty, the speed and length of the discourse of, dialectal variants, among others. On the other hand, there are the cognitive factors. However, there are other factors related to emotions, personality traits and motivations regarding academic subjects. These factors are known as individual differences. Therefore, the aim of this study is to analyze the individual differences of the students of Professional Translation and Interpretation at Universidad Peruana de Ciencias Aplicadas (UPC) in the Interpretation Workshops 1 and 2. The research will use a mixed, quantitative, and qualitative approach; therefore, it is intended to apply the techniques of surveys and focus groups. To address the first sub objective (internal and external affective factors), the modified and adapted questionnaires of Chiang and Beck will be used: Chiang's Anxiety and Interpretation Learning Questionnaire (2006) and Beck's Anxiety Inventory (1988). For the second and third sub objectives (experiences on affective factors and motivations), a focus group guide will be created. In this regard, the students of such workshops are the subjects of study of this research.
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Conocimiento, Dirección de Gestión del. "IEEE Transactions on Image Processing." IEEE, 2004. http://hdl.handle.net/10757/655313.
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Chapa, Siqueiros Miguel Angel, Rivadeneyra José Manuel Paipay, Quinto Jonathan Jofrey Ladera, Melo Anselmo Isaac Moscoso, and Muñoz John André Roque. "QUICKJOB." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/655303.
Full textAbstract:
Desde hace unos años atrás, se observa un incremento de los servicios ofrecidos por internet o plataformas online, originado por la preferencia de los consumidores de recibir dichos servicios a domicilio, con el fin de mantener más horas de descanso u ocio en el hogar; o para cubrir otras necesidades.
En lo que va del año 2020 el brote de nuevo coronavirus provocó un aislamiento social, que obligando a la población a recurrir a otros canales para abastecerse y satisfacer sus necesidades. Consecuentemente, los canales digitales fuero los que más se acondicionaron a dicha necesidad.
El presente proyecto, QuickJob, nace exactamente para cubrir múltiples necesidades que son básicas y comunes en el hogar, pero ofrecidas desde una misma plataforma, de fácil acceso, segura y calificable por el consumidor. Asimismo, los servicios ofrecidos por terceros generarían ingresos adicionales a los interesados en ofrecerlos. Esta visión de negocio, donde, intereses y necesidades se interrelacionan entre sí, bajo una misma plataforma, capaz de ubicar a proveedores y clientes en una radio de acción cercano a sus hogares, es lo que hace atractivo el negocio; ya que, valora una de las necesidades más prioritarias para las personas, que es el tiempo.
Uno de los aspectos que impulsará y fidelizará a los clientes es el servicio de calidad, por el cual se calificará a nuestros proveedores; y así mantener altos niveles de calidad del servicio para ser identificados y recomendados por los mismos clientes; los cuales podrán comentar y valorar cada uno de los servicios que utilizan.
QuickJob se presenta como un negocio que va más allá de una simpe plataforma online, ya que generará una inclusión laboral para personas con intereses de ofrecer sus servicios con eficiencia en el trabajo y optimización de recursos.Since a few years ago, there has been an increase in the services offered by the internet or online platforms, because of consumers' preference to receive said services at home, in order to maintain more hours of rest or leisure at home; or to cover other needs. So far in 2020, the outbreak of the new coronavirus caused social isolation, forcing the population to turn to other channels to supply themselves and meet their needs. Consequently, digital channels were the ones that most adapted to this need. This project, QuickJob, was born exactly to cover multiple needs that are basic and common in the home, but offered from the same platform, easily accessible, safe and qualifiable by the consumer. Likewise, the services offered by third parties would generate additional income to those interested in offering them. This business vision where interests and needs are interrelated, under the same platform, capable of locating suppliers and customers in a radius of action close to their homes, is what makes the business attractive; since it values one of the highest priority needs for people, which is time. One of the aspects that will promote and retain customers is the quality service, by which our suppliers will be rated; and thus maintain high levels of quality of service to be identified and recommended by the clients themselves; which will be able to comment and evaluate each one of the services they use.
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Conocimiento, Dirección de Gestión del. "Journal of Clinical Orthodontics: JCO." JCO, Inc, 2004. http://hdl.handle.net/10757/655333.
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Conocimiento, Dirección de Gestión del. "Journal of Construction Engineering & Management." ASCE Library, 2004. http://hdl.handle.net/10757/655334.
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Conocimiento, Dirección de Gestión del. "Journal of Education Advancement & Marketing." Ingenta Connect, 2004. http://hdl.handle.net/10757/655335.
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Conocimiento, Dirección de Gestión del. "Journal of Global Fashion Marketing." Taylor & Francis Group, 2004. http://hdl.handle.net/10757/655336.
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Conocimiento, Dirección de Gestión del. "Journal of Hospitality & Tourism Research." SAGE Publishing, 2004. http://hdl.handle.net/10757/655338.
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Conocimiento, Dirección de Gestión del. "Jstor." Ithaka Harbors, 2004. http://hdl.handle.net/10757/655353.
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