Dissertations / Theses on the topic 'Bucks'
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Mojapelo, Mamokou Margaret. "Reproduction performance of Saanen bucks supplemented with selenium." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/63294.
Full textDissertation (MSc Agric)--University of Pretoria, 2017.
National Research Foundation (NRF)
University of Pretoria
Animal and Wildlife Sciences
MSc (Agric)
Unrestricted
Pauls, Torben. "Bildung und Praxis Studien zur hermeneutischen Bildungstheorie Günther Bucks." Würzburg Ergon-Verl, 2008. http://d-nb.info/99849884X/04.
Full textPauls, Torben. "Bildung und Praxis : Studien zur hermeneutischen Bildungstheorie Günther Bucks." Würzburg Ergon-Verl, 2009. http://d-nb.info/99849884X/04.
Full textChavez, Stephen John. "Feeding behaviors and performance measurements in bucks, rams, and bulls." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5716.
Full textTitle from document title page. Document formatted into pages; contains vii, 91 p. : ill. (some col.). Includes abstract. Includes bibliographical references.
Bendersky, Corinne (Corinne Bernarda) 1973. "Complementarities in employment dispute resolution systems : bigger bang or just bigger bucks?" Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8436.
Full textIncludes bibliographical references (p. 133-147).
Organizations face increasing pressure to improve internal conflict management, which has led to experimentation with different types of dispute resolution components. These include: Rights-based processes, in which third-parties determine the outcome of a dispute based on laws, contracts or standards of behavior; Interest-based neutrals, who manage the dispute resolution process and leave decision-making authority to the parties themselves; and Negotiations, which include all efforts by individual disputants to resolve conflicts themselves. Anecdotal evidence suggests that systems combining all three types of dispute resolution components are more effective than any of the individual or pairs of components. To date, however, there is no theoretical explanation or rigorous empirical evidence to justify the regular implementation of full dispute resolution systems by organizational leaders. In this dissertation I present and test two competing theoretical models to explain the benefits of dispute resolution systems over pairs and individual components. The first is an additive model, in which the more types of components that are available, the more types of disputes that can be managed. The second model is a complementarities model, in which none of the components can operate effectively without reinforcement from the other types of components. Thus, performance benefits accrue only when a full system is implemented.
(cont.) I test these competing models in a multi-method quasi-experimental and two supplemental before-and-after field studies. I consistently find evidence contradicting the additive model, and suggestive evidence supporting the complementarities model. The effects of exposing employees to a three-component dispute resolution system are: 1) more positive attitudes towards workplace conflict, 2) less conflict avoidance, 3) more conflict negotiation, and 4) more conflict resolution. When employees are exposed to a two-component system, however, only negotiation behaviors increase. All other outcomes were either non-significant or in the opposite-to-expected direction. Although this study is not conclusive evidence of the complementarities model, the data clearly reject the additive one. This study implies that practitioners should focus on introducing full systems to organizations instead of taking an incremental approach to changing dispute resolution behaviors.
by Corinne Bendersky.
Ph.D.
Graeff, Michael. "An archive: housing the written history of the citizens of Bucks County, Pennsylvania." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/44423.
Full textThe growth of any community is marked many times over by the coming of progress which may be regarded either with promise or as a threat. The history of Doylestown records the arrival of train travel as an event.
It would be a remarkable change that could put a small town on the map by opening doors of travel and communication in the heart of rural farmland. The tracks entered the town from the southwest and ended a few blocks downhill from the original crossing of Main and State Streets at its center. The rail line would now be the demarcation between town and country - an edge. A passenger station was built as were an array of light industrial and farm trade buildings, splayed out in rows along the lengths of track. The empty lots between center and edge became a weave of streets lined with town houses constructed to acknowledge the train with large front porches open wide welcoming the arrival of both the familiar and the stranger.
The ebb and flow of pedestrians descending and ascending from town to train and train to town became the daily ritual established by such progress. It is in this routine and the willing communication between buildings that lay a complimentary existence defining the character of a neighborhood.
It is a further part of progress that centers of activity with their subsequent community of buildings become obsolete. Yet from obsolescence may be found rebirth, and the rail yard was no exception. Commerce waned and then shifted from industrial and agrarian means to service oriented trade with each vacant structure quietly resurrected under adaptive re-use. The commuter line still operates though continually threatened with closure. A truth made evident by the perpetually locked doors of the station. The only activity that has a direct connection to the rail yard's past is the ritual of the commuting passengers. Pedestrian traffic into town still beats its daily walk up the stairs and sidewalks along the same streets. The numbers are now supplemented though by a stream of vehicles as evidenced by the number of parking spaces fit neatly into the available open nooks of the old freight house. Despite these progressive changes what is of greatest significance is that none has occurred to the detriment of the fabric of the existing neighborhood. It remains a distinctly vibrant edge only because new activities were necessary in offering new opportunities and a feeling of continuum. The site for the archive therefore lies at this edge of town.
Master of Architecture
Stiefbold, Angela S. "Farming Scenery: Growing Support for Agricultural Land Preservation, Bucks County, Pennsylvania, 1930-1990." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1592133417563856.
Full textStrawn, Rachel Mayes. "Drivin' trucks, huntin' bucks, and reading Aristotle?: The rural student's college choice dilemma." W&M ScholarWorks, 2014. https://scholarworks.wm.edu/etd/1550154174.
Full textSchmoyer, Gerald Richard. ""The life of Jesus for children" an evaluation of a Bible study for Bucks Area Home Schoolers /." Theological Research Exchange Network (TREN), 2006. http://www.tren.com/search.cfm?p001-1073.
Full textFriedman, Gail. "Remembering Del-Aware: Community Activism and Eco-Politics in Bucks County, Pennsylvania in the Age of Reagan." Master's thesis, Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/396215.
Full textM.A.
This thesis tells the previously untold story of how environmental activists in Bucks County, Pennsylvania, in the 1980s waged a nearly decade-long and ultimately losing battle against a plan to pump water from the free-flowing Delaware River. As a case study of grassroots community activism during the presidential administration of Ronald Reagan, the struggle known locally as “Dump the Pump” and spearheaded by a nonprofit organization called Del-AWARE supports and provides a regional take on recent scholarship that has illuminated the vibrant underlying dynamics of local civic engagement occurring amid the overshadowing political conservatism of the Reagan years. Also a case study in public history, this thesis demonstrates how collective historical memory fueled not only Del-AWARE’s protracted struggle, but its enduring legacy in public policy and community life. It concludes with suggestions for preserving the history of Del-AWARE before it is lost forever.
Temple University--Theses
Tolley, Rebecca. "More Bang For Your Book Bucks: The Added Value of Table of Contents (TOC) Record Enhancement [Poster Session]." Digital Commons @ East Tennessee State University, 2002. https://dc.etsu.edu/etsu-works/5749.
Full textHelge, Adam. "Procedurell Generering - Rum och Korridorer : En jämförelse av BSP och Bucks algoritm som metoder för procedurell generering av dungeons." Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-15288.
Full textGrundy, Martha Paxson. "“In the world but not of it”: Quaker faith and the dominant culture, Middletown Meeting, Bucks County, Pennsylvania, 1750-1850." Case Western Reserve University School of Graduate Studies / OhioLINK, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=case1058985472.
Full textHillbrick, Gordon Colin, and kimg@deakin edu au. "THE LIPID COMPOSITION OF CASHMERE GOAT FIBRES." Deakin University, 1994. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20031205.162817.
Full textKatjavivi, Perivi John. "Film and national culture in Namibia: a study and analysis of how the films 100 Bucks and Try have contributed to the creation of post-colonial identity and national culture in independent Namibia." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/22784.
Full textSayers, Jeremy H. "The Great Mysterious." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1271258434.
Full textCox, Scott Lee Londré Felicia Hardison. "Buck Hoss." Diss., UMK access, 2006.
Find full text"A thesis in theatre." Typescript. Advisor: Felicia Hardison Londré́. Vita. Title from "catalog record" of the print edition Description based on contents viewed Jan. 26, 2007. Includes bibliographical references (leaves 92-93). Online version of the print edition.
Müller-Kelwing, Karin. "Hellmuth Buck." Böhlau Verlag, 2020. https://slub.qucosa.de/id/qucosa%3A75035.
Full textBuck, Anja. "Untersuchungen zur Bedeutung der sal-ähnlichen Gene bei der Maus." [S.l.] : [s.n.], 2001. http://webdoc.sub.gwdg.de/diss/2002/buck/buck.pdf.
Full textWei, Jia. "Investigation of High-Input-Voltage Non-Isolated Voltage Regulator Modules Topology Candidates." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/32482.
Full textMaster of Science
Qiu, Yang. "High-Frequency Modeling and Analyses for Buck and Multiphase Buck Converters." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29804.
Full textPh. D.
Dey, Sourav. "Large-Signal Analysis of Buck and Interleaved Buck DC-AC Converters." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1409578634.
Full textRahman, Muhammad Saad. "Buck Converter Design Issues." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-9713.
Full textSwitch Mode Power Supplies are very important components in present day electronics and have continued to thrive and grow over the past 25 years. This thesis looks inside how the SMPS have evolved over the passage of years with special emphasis to the Synchronous Buck Converter. It also discusses why there is a strong potential to further the study related to designs based around a Synchronous Buck Converter for portable applications. The main objective of the thesis is to look into the controller design for minimizing size, enhancing efficiency and reliability of power converters in portable electronic equipment such as mobile phones and PDAs. The thesis aims to achieve this using a 90 nm process with an input voltage of 1.55V and an output of 1V with a power dissipation of 200mW.
Buck, David Hidden. "Promoting more effective student questions through specific questioning strategies." Montana State University, 2011. http://etd.lib.montana.edu/etd/2011/buck/BuckD0811.pdf.
Full textOlivar, Gerard. "Chaos in the buck converter." Doctoral thesis, Universitat Politècnica de Catalunya, 1997. http://hdl.handle.net/10803/5841.
Full textEl capítulo 2 resume la información básica sobre convertidores conmutados de corriente contínua, y también sobre qué tipo de comportamiento cabe esperar de un sistema dinámico no lineal. Se discuten las referencias más relevantes sobre circuitos no lineales, y en concreto, las que atañen a circuitos caóticos en electrónica de potencia.
Los sistemas de ecuaciones diferenciales lineales a trozos con dos topologías se introducen en el capítulo 3. Como caso particular, se dan las ecuaciones que rigen la dinámica del convertidor buck con control PWM, y se establecen algunas propiedades básicas de las soluciones. La técnica general para obtener órbitas periódicas se particulariza para las soluciones T-periódicas y 2T-periódicas, y se establecen resultados para algunos tipos específicos de las nT-periódicas.
En el capítulo 4 se detalla el análisis de la aplicación estroboscópica. Este capítulo está orientado geométricamente, aunque el cálculo numérico es también imprescindible para obtener resultados específicos. Se halla también una región de atrapamiento para el sistema, en la cual se encuentra una aplicación de tipo horseshoe. La herramienta principal de este capítulo es la continuidad de la aplicación de Poincaré asociada, que permite deducir analíticamente como se transforman las diferentes regiones del espacio de fases.
El capítulo 5 está dedicado a las bifurcaciones secundarias halladas conjuntamente con el atractor principal. En este capítulo, el cálculo numérico es esencial para hallar los diagramas de bifurcaciones, las variedades invariantes y las cuencas de atracción. Como las soluciones son conocidas analíticamente a trozos, los algoritmos se benefician de ello en rapidez y sencillez. Se encuentran bifurcaciones suaves y no suaves. Se dan también expresiones exactas para los multiplicadores característicos, lo cual representa una gran ventaja cuando se calculan las bifurcaciones.
El capítulo 6 se aparta ligeramente del espíritu general de la tesis. En lugar de describir el comportamiento caótico del sistema, se sugieren algunos métodos de control de caos y se simulan éstos para comprobar si producen los efectos deseados. En concreto, se dan tres opciones: primero, se concreta el método OGY para las ecuaciones del convertidor buck ; segundo, se sugieren varios esquemas de control de realimentación con retardos, y tercero, se propone un método de control de lazo abierto. El control del comportamiento caótico en este circuito es importante, puesto que reduce el rizado de salida y por tanto, amplia el rango operacional del convertidor.
Algunas sugerencias para seguir el estudio de estos sistemas dinámicos se dan en el capítulo 7. Algunas simulaciones se han hecho con una versión suavizada del sistema de ecuaciones diferenciales con el software standard AUTO. También se proponen aproximaciones de la aplicación de Poincaré, que pueden proporcionar un tratamiento más analítico y simulaciones más rápidas.
Олейник, Н. Г., and Юрий Иванович Подъячий. "Исследование корректоров мощности BUCK/BOOST." Thesis, Национальный технический университет "Харьковский политехнический институт", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/44600.
Full textBozzo, Closas Bernat. "Superconducting joining of melt textured YBCO bulks." Doctoral thesis, Universitat Autònoma de Barcelona, 2016. http://hdl.handle.net/10803/369047.
Full textThe obtention of bulk YBa2Cu3O7 tiles by the Top Seeded Melt Growth method carries and implicit limitation on the shape and size of the pieces. In order to overcome this limitation a joining method based on the use of an Ag foil as a welding agent has been proposed. This thesis work was focused in the following aspects: • The refinement of the welding methodology for YBCO pellets in order to solve the issues present. • Characterization of the microstructure of welded pellets. • The development of suitable quantitative analysis tool for evaluating the weld quality in terms of its superconducting behavior. • The expansion of the methodology to include welds with crystallographic misorientation and study the influence of such a crystallographic misorientation on the electric and magnetic properties The first step was to develop a furnace bundled with an in-situ observation video setup that allowed visually record the evolution of the sample during the thermal process. Those videos revealed the existence of two types of liquids that were dragged out from the weld position. The microstructural study carried out on the welded samples indicated that this loss of liquid was the source of microstructural malformations at the weld position. A modification on the sample holder was required and solved the issue. All the studied samples were analyzed under the scope of their micro-structural characteristics and their magnetic properties. For the case of the micro-structural characterization, a basic study was carried out in order to determine the successfulness of the weld formation and it was used as a feedback parameter for fine-tuning the thermal process. The weld microstructure was further investigated in order to obtain more information about its characteristics and in order to obtain a better understanding about the mechanisms that make the weld formation possible. A proper study of the magnetic and electric properties was also required, since the final objective of the superconducting welding technology is to join several YBCO tiles while maintaining the superconducting properties at the weld position. For that purpose, magnetic imaging Hall Effect based measurements were performed on the specimens under study. From the local magnetization maps, current density distribution maps were obtained by using specialized software. In order to understand and obtain useful information from those current density maps, a simulation software piece was developed and the knowledge acquired from those simulations allowed obtaining the inter- and intra-granular critical current density values (JcGB and JcG) from each sample. The ratio between JcGB and JcG was studied as a function of the misorientation angle. In principle, a behavior similar to coated conductors was expected. However, the dependence found was weaker than the considered model case. That determined dependence was compared with similar studies on grain boundaries in bulk YBCO, revealing a similar behavior and indicating that the JcGB/JcG ratio value was potentially intrinsic to the misorientation angle. This hypothesis was confirmed when several samples with different YBCO grain characteristics but with the sample misorientation were compared. Field dependence measurements of the magnetization maps were also performed in order to determine the vortex pinning regimes present at the samples and to compare them with the thin film case. Despite the weld pinning regimes were similar, the behavior at the grain was slightly different. Finally, the superconducting properties were correlated with the mechanical properties. The hardness of the material was evaluated by using nano-indentation techniques at different positions. The ratio between the hardness at the weld and away from the weld exhibited a high correlation with the JcGB/JcG ratio.
Buck, Imke. "Der späte Zola als politischer Schriftsteller seiner Zeit." Mannheim : MATEO, Universität Mannheim, 2003. http://www.uni-mannheim.de/mateo/verlag/diss/buck/buckabstract.html.
Full textBeugly, Jayson S. "Fish and invertebrate communities in agricultural headwater streams." Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1391472.
Full textDepartment of Biology
Cazzell, Gregory A. "Output Impedance in PWM Buck Converter." Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1247006982.
Full textChadha, Ankit. "Tapped-Inductor Buck DC-DC Converter." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1578488939749599.
Full textBuck, Sandra Franziska [Verfasser]. "Genetik paranoiden Denkens / Sandra Franziska Buck." Halle, 2017. http://d-nb.info/1144955270/34.
Full textBarbagallo, Mariano. "HV Interleaved Multiphase DcDc Buck-Boost Converter." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Find full textDageryd, Marcus. "A Comprehensive Buck-Passing Account of Value." Thesis, Umeå universitet, Institutionen för idé- och samhällsstudier, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-105631.
Full textYang, Shun. "Modelling and control of a Buck converter." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2207.
Full text+46-762795822
Buck, Alexander [Verfasser]. "Simulation von Bremsenquietschen (Brake Squeal) / Alexander Buck." Aachen : Shaker, 2008. http://d-nb.info/1161305882/34.
Full textGaligekere, Veda Prakash N. "SiC Schottky Diodes and Polyphase Buck Converters." Wright State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=wright1190064950.
Full textBorges, Altamir Ronsani. "Retificador trifásico buck-boost de estágio único." Florianópolis, 2012. http://repositorio.ufsc.br/xmlui/handle/123456789/96385.
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Este trabalho apresenta uma nova topologia de retificador trifásico de estágio único com característica Buck-Boost. Inicialmente é apresentada uma revisão bibliográfica envolvendo as publicações mais relevantes na área de estudo. Na sequencia são apresentadas a motivação para o trabalho e as contribuições da Tese. A topologia proposta é apresentada sendo descritas a sua origem e seus modos de operação de interesse. São analisados então os modos de condução descontínua (MCD) e contínua (MCC). No MCC são analisados os modos de operação Buck, Buck+Boost e Boost. As etapas do estudo de cada modo de operação compreendem a descrição das etapas de operação, análise teórica estudos por simulação numérica, definição das equações de projeto e resultados experimentais.
This work presents a new topology of three-phase rectifier with singlestage and Buck-Boost characteristic. Initially a literature review is presented which brings the most important publications in the study area. Following it is presented the motivation for the work and the contributions of this thesis. The proposed topology is then presented, with descriptions of their origin and their operation modes of interest. Are then analyzed the discontinuous (DCM) and continuous (CCM) conduction modes. At MCC, we analyze the operation modes Buck, Boost and Buck + Boost. The study stages of each mode of operation include the description of the operation stages, theoretical analysis, numerical simulation studies, definition of design equations and experimental results.
Costa, Levy Ferreira. "Conversor CC-CC buck+boost multinível bidirecional." reponame:Repositório Institucional da UFSC, 2013. https://repositorio.ufsc.br/handle/123456789/107621.
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Este trabalho apresenta uma nova topologia de conversor cc-cc Buck+Boost bidirecional multinível, adequado para aplicação em alta tensão. Esta topologia é gerada a partir da associação de um conversor Buck e um conversor Boost, ambos bidirecionais e multiníveis. As topologias multinível são obtidas a partir da generalização dos conversores Buck e Boost de três níveis. As principais características do conversor Buck+Boost proposto são: redução dos esforços de tensão nos semicondutores e capacitores,- tornando-o possível para aplicação em alta tensão; capacidade de processamento de fluxo bidirecional de energia; frequência de operação dos magnéticos múltipla da freqüência de comutação dos interruptores. Além disso, o conversor Buck+Boost proposto apresenta oito capacitores, cujas tensões devem ser balanceadas para a correta operação do conversor. Portanto, uma estratégia de balanço das tensões nos capacitores da topologia é apresentada e uma técnica de controle utilizando uma ação de feedforward é proposta. Para validar a análise teórica, um protótipo com especificação de 10 kW de potência de saída, tensão de entrada de 1 kV e de saída de 750 V foi construído e avaliado experimentalmente. Os resultados experimentais comprovaram as vantagens do conversor cc-cc proposto e da técnica de controle proposta para balanço das tensões nos capacitores
Abstract: This work presents a novel topology of a Buck+Boost bidirectional multilevel dc-dc converter suitable for high voltage applications. The proposed topology is constructed by cascading a Buck-type and a Boost-type converter, both bidirectional and multilevel. The multilevel topologies are derived from standard three level topologies. The main features of the proposed Buck+Boost converter are: reduced voltage stress across the semiconductors, allowing its use in high voltage; bidirectional power flow; frequency operation of the inductor is a multiple of the switching frequency. Moreover, the proposed Buck+Boost topology presents eight capacitors, which their voltage must be controlled for proper operation of the converter. Therefore, a strategy to balance the voltages across these capacitors is presented and a complete feedback control technique with an inductor current feedforward action is proposed. In order to validate the theoretical analysis, a prototype with 10 kW output power capability, 1 kV to 750 V input-to-output voltage was constructed and experimented. The results attest the advantages of the new dc-dc topologies and developed feeback control.
Murase, John Takeshi. "Investigation of Buck Converter Radiated Emissions (150 kHz - 30 MHz) Measured according to CISPR 25." Thesis, KTH, Elektroteknisk teori och konstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-140954.
Full textDooley, Tadhg. "Remembering Buck v. Bell: its history and contemporary relevance." Thesis, Boston University, 2003. https://hdl.handle.net/2144/27639.
Full textPLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
2031-01-02
Dong, Yan. "Investigation of Multiphase Coupled-Inductor Buck Converters in Point-of-Load Applications." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/28469.
Full textPh. D.
Ganapathy, Shunmugam. "Apparent diffusion coefficients of carbon dioxide through grain bulks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/NQ41611.pdf.
Full textDoss, Gary Richard Jr. "Novel Intelligent Power Supply Using A Modified Pulse Width Modulator." Wright State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=wright1253576739.
Full textPierleoni, Enrico. "Analisi e progetto del Z-Source Buck Converter." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16305/.
Full textAllen, Kirk D. "Practical implementation of the hard switched buck chopper." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA331788.
Full textKilic, Umit Erdem. "Design Of Buck Converter For Educational Test Bench." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608153/index.pdf.
Full text"Evaluation of E-Bucks: A Simulated Classroom Economy." Doctoral diss., 2010. http://hdl.handle.net/2286/R.I.8706.
Full textDissertation/Thesis
Ed.D. Educational Leadership and Policy Studies 2010
Chang, Shao-Chih, and 張紹智. "Seasonal change of semen characteristic in dairy goat bucks." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/83543183700711572273.
Full text國立中興大學
畜產學系
91
Seasonal Changes of Semen Characteristics in Dairy Goat Bucks Shao-Chih Chang Abstract The purpose of this study was to investigate the effect of photoperiod and season on fresh semen characteristics and frozen semen quality of dairy goat bucks. Seven healthy and sexually matured dairy goat bucks were used in this study. Scrotal circumference were measured and semen samples were collected with an artificial vagina once weekly during a year. Semen volume, mass activity score and motility score of sperm, percentage of abnormal sperm and dead sperm, sperm concentration and total sperms per ejaculation were measured respectively. Semen with 3.0 or higher score of mass activity of sperm were diluted with 10% skim milk extender biweekly and cryopreserved for one week and three months respectively. Afterward, the post-thawed motility score and viability of sperm in frozen semen were evaluated. The natural photoperiod was divided into long-daylight period(>12 hrs)and short-daylight period(<12 hrs)groups, and the year was divided into:spring, summer, autumn and winter seasons. The result showed that the percentage of abnormal sperm(7.18±0.28 vs.5.81± 0.26%), sperm concentration(4.11±0.07 vs.3.65±0.06 ×109 sperms/ml)and total sperms per ejaculation(4.67±0.09 vs.4.16±0.10 ×109 sperms)of long-daylight period group were higher than those in short-daylight period group(P<0.05).There were no significant difference(P>0.05)in scrotal circumference, semen volume, mass activity score and motility score of sperm and the percentage of dead sperm between two photoperiods groups. The maximal scrotal circumference of dairy goat bucks occurred in autumn(30.27±0.08 cm)and was significantly higher than those in other seasons(P<0.05). Semen volume was higher in autumn(1.30±0.03 ml), lower in spring(1.03±0.02ml)and it showed significantly seasonal difference (P<0.05). The mass activity and motility score of sperms in spring (3.90±0.07 and 2.87±0.07)were significantly lower than those in the other seasons(P<0.05). The highest percentage of dead sperms presented in spring (25.54±1.41%)and it was significantly higher than those in the summer (21.10±0.64%)and winter(21.12±1.10%),but there were no significantly difference between spring and autumn(P>0.05). The percentage of abnormal sperms was highest in the autumn and lowest in the winter. Sperm concentration in winter(3.46±0.06×109 sperm/ml)was significantly lower than those in other seasons(P<0.05). Total sperms per ejaculation in summer (4.76±0.12×109 sperms)and autumn(4.77±0.12×109 sperms)were significantly higher than those in the spring(4.18±0.09×109 sperms) and winter(3.93±0.14×109 sperms)(P<0.05)。 Post-thawed motility score of sperm in frozen semen cryopreservated for one week was significantly higher in short-daylight period group(2.07±0.25)than those in long-daylight period group(1.83±0.0l)(P<0.05),and it was lower in spring(1.67±0.05)than those in other seasons. There were no significantly difference in viability of sperms between two daylight period groups and between seasons. Semen cryopreservated for three months showed significant difference on post-thawed motility score of sperms between different daylight period groups(P<0.05),and it also showed significantly seasonal difference(P<0.05), But there was no significantly difference in viability of sperms between two daylight period groups and seasons. It was concluded that, the semen characteristics of dairy goat bucks in central Taiwan showed significantly seasonal variation, and the frozen semen quality was in accordance with the seasonal variation of fresh semen. Keyword:Dairy goat bucks, semen characteristics, frozen semen, season.
Nethenzheni, Livhuwani Pertunia. "Effect of bioxcell and triladyl extenders and removal of seminal plasma of equilibrated and cryopreserved goat semen." Diss., 2017. http://hdl.handle.net/11602/691.
Full textDepartment of Animal Science
The objectives of the study were to evaluate the effect of two extenders (Triladyl® and Bioxcell®) and the removal of seminal plasma on goat buck semen. Six ejaculates were collected from six indigenous bucks by means of electro-ejaculator method, and semen was pooled, and replicated 10 times. Raw semen were randomly allocated into six groups as follows: (i) Raw non-washed, (ii) Raw washed, (iii) Triladyl®-washed, (iv) Triladyl®-non-washed, (v) Bioxcell®-washed and (vi) Bioxcell®-non-washed. All six groups were analysed for spermatozoa motility rates using computer-aided sperm analysis (CASA). The spermatozoa viability for all groups were assessed using Eosin-Nigrosin, acrosome integrity using Spermac, chromatin structure using Acridine Orange, and mitochondria using JC-1 staining solutions. Both the Triladyl® and Bioxcell® washed semen groups were diluted (1:4) with Phosphate Buffered Saline (PBS) then centrifuged at 1500 x g for ten min and seminal plasma was aspirated using 1 mL sterile plastic pipette. Semen samples were diluted (1:4) as follows: Triladyl® (washed and non-washed) or Bioxcell® (washed and non-washed) and then equilibrated at 5 ºC for 2 hours. Following equilibration, semen parameters were analysed. Thereafter, the semen samples were loaded into straws and placed 5 cm above a liquid nitrogen vapour for 10 min, and then stored at -196 ºC until use. Following one month of storage, frozen semen straws per treatment group were thawed at 37 ºC for 30 seconds, then semen parameters were analysed again. Significant differences among the mean values of semen parameters were determined by Tukey’s test using ANOVA, GLM procedure of SAS version 12.1 of 2010. Total Spermatozoa motility rate of Bioxcell® (92.5±4.6), (68.2±13.5) and Triladyl® (94.9±5.5), (63.1±15.1) were significantly reduced (P < 0.05) following equilibration and freeze-thawing process, respectively on washed semen groups. Live and normal spermatozoa percentages were drastically reduced in Bioxcell® (5.2±4.9) and Triladyl® (6.9±8.6) washed semen groups, following freeze-thawing. There was a significantly lower number of spermatozoa with high mitochondrial membrane potential in non-washed semen extended with Triladyl® (68.7±26.8) compared to non-washed semen extended with Bioxcell® (49.8±20.1) following the freeze-thawing process. In conclusion, the freezing-thawing process did reduce the indigenous buck semen parameters irrespective of removal or non-removal of seminal plasma. However, Bioxcell® extender was found to be more suitable for preserving spermatozoa during equilibration and freezing/thawing process of buck semen.