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Law, Lai-ming Teresa. "Guidance training needs and support : class teachers' perception /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22266756.
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Fortunato, Francesca <1990>. "High-dimensional and one-class classification." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amsdottorato.unibo.it/8412/1/ThesisMain.pdf.
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When dealing with high-dimensional data and, in particular, when the number of attributes p is large comparatively to the sample size n, several classification methods cannot be applied. Fisher's linear discriminant rule or the quadratic discriminant one are unfeasible, as the inverse of the involved covariance matrices cannot be computed. A recent approach to overcome this problem is based on Random Projections (RPs), which have emerged as a powerful method for dimensionality reduction. In 2017, Cannings and Samworth introduced the RP method in the ensemble context to extend to the high-dimensional domain classification methods originally designed for low-dimensional data. Although the RP ensemble classifier allows improving classification accuracy, it may still include redundant information. Moreover, differently from other ensemble classifiers (e.g. Random Forest), it does not provide any insight on the actual classification importance of the input features. To account for these aspects, in the first part of this thesis, we investigate two new directions of the RP ensemble classifier. Firstly, combining the original idea of using the Multiplicative Binomial distribution as the reference model to describe and predict the ensemble accuracy and an important result on such distribution, we introduce a stepwise strategy for post-pruning (called Ensemble Selection Algorithm). Secondly, we propose a criterion (called Variable Importance in Projection) that uses the feature coefficients in the best discriminant projections to measure the variable importance in classification. In the second part, we faced the new challenges posed by the high-dimensional data in a recently emerging classification context: one-class classification. This is a special classification task, where only one class is fully known (the target class), while the information on the others is completely missing. In particular, we address this task by using Gini's transvariation probability as a measure of typicality, aimed at identifying the best boundary around the target class.
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Burrow, Stephen George. "Low power, high efficiency Class D amplifiers." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271779.
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Sandhiya, Emika. "High efficiency class E microwave frequency multipliers." Thesis, University of Leeds, 2007. http://etheses.whiterose.ac.uk/21099/.
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A novel design methodology for the successful implementation of high efficiency class E frequency multipliers is presented in this work. An innovative class E configuration is proposed for a frequency tripler that provides an advantage over the conventional designs, by allowing a 50 %duty cycle drive with a realisable load for 100 %DC-to-RF efficiency operation. A novel quantitative analysis of class E networks is developed that aids in the rapid yet accurate assessment of circuit performance. The first-order analysis provides an intuitive evaluation of class E operation and harmonic content of the switch waveforms. The analysis is shown to be applicable to both class E amplifiers and multipliers, providing closed-form equations for an intelligent first design. The proposed class E tripler configuration is evaluated using this technique and is shown to be a practically viable solution for achieving high DC-to-RF efficiency. Techniques involved in the design and implementation of the novel frequency tripler are investigated, and three microstrip circuits are presented that provide high drain efficiency, high unwanted harmonic rejection and low DC power consumption. Innovative design of the input matching circuit that exploits the nonlinear input capacitance of the device, and the output matching circuit that simultaneously provides appropriate harmonic terminations and unwanted harmonic rejection, ensure a simultaneously high achievable conversion gain and DC-to-RF efficiency. Practical demonstration of the three novel circuits display the highest reported DC-to-RF efficiency and conversion gain for m~crowave frequency triplers to date. Trade-oITs between circ.uit complexity,size and simultaneously achievable high efficiency and high conversion gain are identified and elucidated with the three novel designs.
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Law, Lai-ming Teresa, and 羅麗明. "Guidance training needs and support: class teachers' perception." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31961757.
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Pinta, Kristen Janet. "Inclusion strategies for the high school guitar class." Thesis, California State University, Long Beach, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1523263.
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<p> As researchers learn more about the human mind, educators adapt their curriculum to accommodate those findings. As these changes take place, school districts are offering different types of classes to help more students find success in their classes. One of the ways that music educators can contribute to these changes is to offer music classes other than the traditional band, choir and orchestra class. By adding a guitar class to the music curriculum, music teachers are opening the doors for more students to be able to learn about music and learn to play an instrument. Particularly, a guitar class is an effective way to include students with special needs in a music program. </p><p> This thesis will investigate adaptations designed for three students with special needs in a high school guitar class. Student A has been diagnosed as Autistic, Student B has been diagnosed with Asperger's disorder and also has behavioral issues and Student C has been diagnosed with a specific learning disability as evidenced in the areas of auditory processing and expression. The case studies provide an example of how accommodations and adaptations can easily be implemented within a guitar class curriculum for students with these types of learning disabilities.</p>
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Ho, Man-yee Mandy. "Peer assessment a case study of a certificate geography class in Hong Kong /." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37597620.
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Loikkanen, M. (Mikko). "Design and compensation of high performance class AB amplifiers." Doctoral thesis, University of Oulu, 2010. http://urn.fi/urn:isbn:9789514261770.
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Class A and class AB operational amplifiers are an essential part of a mixed- signal chip, where they are used as active filter sub-blocks, compensators, reference current generators and voltage buffers, to name just a few of many applications. For analog circuits such as operational amplifiers a mixed-signal chip is a very unfriendly operating environment, where the power supply is often corrupted by high current switching circuits. In addition, power supply voltages for analog blocks are shrinking, because of the deployment of new battery technologies and fine line length integrated circuit processes, which can reduce the amplifier dynamic range a problem requiring supply insensitive low voltage compatible amplifier topologies and other analog blocks.
The aims of this thesis were to further develop the low voltage compatible class AB amplifier topologies published earlier by other authors, to improve their bandwidth efficiency by means of re-examining two- and three-stage amplifier compensation techniques and to find solutions for enhancing the high frequency power supply noise rejection performance of class A and class AB amplifiers without degrading their signal path stability.
The class AB amplifier cores presented here improve the amplifier’s power supply noise insensitivity at high frequencies and increase bandwidth efficiency when compared to the commonly used two-stage Miller compensated amplifier, enabling the construction of better buffers and more power-efficient and reliable low voltage mixed signal chips.
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Grayston, Reginald Edmund. "High-efficiency class E amplifier employing silicon carbide MESFETs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0013/MQ32397.pdf.
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Williams, Katherine W. "Food science in the junior high school foods class." CSUSB ScholarWorks, 1988. https://scholarworks.lib.csusb.edu/etd-project/340.
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Ingram, Jennifer. "Whole class interaction in the mathematics classroom : a conversation analytic approach." Thesis, University of Warwick, 2012. http://wrap.warwick.ac.uk/49627/.
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This thesis analyses whole-class interactions in the mathematics lessons of four mathematics teachers and their pupils. A conversation analytic approach was taken in analysing the transcripts of whole-class interactions, focusing on those interactions that were about mathematics. The sequential organisation of talk, in particular turn-taking and preference organisation, is examined for similarities and differences across the four classrooms and the implications these may have for the teaching and learning of mathematics are explored. This research also examines the discursive construction of the mathematical tasks and activities in each of the classrooms. The analysis reveals that the teachers and pupils orient to the institutional setting in which the interaction occurs. The structure of interactions in formal classrooms offers opportunities that can support particular features of learning mathematics, such as using mathematical terminology, building in opportunities for pupils to think about the mathematics, explain their reasoning, and ask mathematically related questions. However, these structures also constrain the interactions and so features of learning mathematics only feature in interactions that deviate from the usual patterns of interaction in formal classrooms, such as argumentation and justification. Finally, this research offers evidence that the way mathematical tasks and activities are talked into being affects the nature of the mathematics that the pupils experience.
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Mortazavi, Seyed Yahya. "Millimeter-Wave Harmonically-Tuned Silicon Power Amplifiers for High Efficiency." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/82440.
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This works demonstrates the feasibility of the inverse-Class-F harmonic tuning approach for mm-wave silicon PAs. This research addresses the challenges and limitations of the high efficiency inverse-Class-F PAs for mm-wave silicon technology. This work proposes different load networks to mitigate the challenges which are verified with implementations at different mm-wave frequencies with the highest power efficiency performances reported so far: PAE= 50% @ 24 GHz, PAE = 43% @ 41 GHz, and PAE = 23% @ 94 GHz. The design methodology and detailed analysis of the proposed load networks presented and verified with implementation and measured results.<br>Ph. D.
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Phillips, J. Morgan. "The Role of High School Rank in College Admissions:." ScholarWorks @ UVM, 2008. http://scholarworks.uvm.edu/graddis/180.
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Each year, admissions officers throughout the United States commit many intense months to reviewing applications to their college/university. According to the College Board, there are established key elements considered in admissions decisions, including grades in college prep courses, standardized test scores, overall academic performance, and class rank. Approximately half of high schools in the U.S. provide class rank, yet it has maintained importance as the number four factor for over a decade, trumping other factors such as extracurricular accomplishments, teacher recommendations, and interviews. A student’s rank-in-class can be used to determine their relative achievement within his or her school, to compare them to the entire applicant pool at a college or university, and to rate students for scholarship selection, along with selections for countless other accolades and financial awards. Rank is calculated across a wide span of methods using grade point averages (GPAs) that sometimes account for course rigor, and sometimes do not. So that colleges/universities might evaluate rigor and competitiveness of each applicant based on the school’s institutional priorities, I contend that colleges/universities should recalculate GPAs as provided from the high school, giving weight to what they value as an institution. Over the past year, I have dramatically shifted my belief in the way rank ought to be used. Earlier in my admissions career, I believed rank was accurate and useful. Now that I have taken significant time to consider the role of rank from the perspective of a school counselor, I realize that it is not the beacon of precision. It has become increasingly clear to me that it is the job of colleges/universities to rank high school students; it is not the job of high schools. During months spent speaking with current and former school counselors, and my own motivation to become a school counselor, I realized that it does not ultimately benefit high schools to provide colleges with rank and it does not benefit colleges to use a precise rank that is born out of one specific context.
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Book, Stefan. "1kW Class-E solid state power amplifier for cyclotron RF-source." Thesis, Uppsala universitet, FREIA, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-341693.
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This thesis discusses the design, construction and testing of a highefficiency, 100 MHz, 1 kW, Class-E solid state power amplifier. The design was performed with the aid of computer simulations using electronic design software (ADS). The amplifier was constructed around Ampleon's BLF188XR LDMOS transistor in a single ended design. The results for 100 MHz operation show a power added efficiency of 82% at 1200 W pulsed power output. For operation at 102 MHz results show a power added efficiency of 86% at 1050 W pulsed power output. Measurements of the drain- and gate voltage waveforms provide validation of Class-E operation.
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Fritz, Corey F. "The use of homework grades to compute final course grades in a college preparatory chemistry class." Online version, 2009. http://www.uwstout.edu/lib/thesis/2009/2009fritzc.pdf.
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Jacinto, Abel Carlos. "Thermo-Hydro-Mechanical Behaviour of expansive clays under high temperatures." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/6269.
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Esta Tesis presenta los resultados de la investigación desarrollada en el marco del proyecto Temperature Buffer Test (TBT). El objetivo general de este proyecto es investigar el desempeño de la bentonita usada en barreras de ingeniería bajo la acción de las altas temperaturas que se esperan alrededor de los contenedores con residuos vitrificados. Dentro del proyecto, se ha implementado un ensayo de campo a escala real que simula el almacenamiento de residuos radioactivos de alta actividad. Adicionalmente, se realizaron experimentos en laboratorio para evaluar la respuesta de la bentonita usada en el proyecto bajo diferentes acciones externas.<br/><br/>Las formulaciones que se usan para analizar el comportamiento de barreras de ingeniería de arcillas se escriben en términos de las variables de estado usando relaciones constitutivas. Entre esas leyes la curva de retención define la relación constitutiva entre la cantidad de agua en el suelo y su nivel de energía. Tradicionalmente, la influencia de variables externas como la temperatura y la fábrica del suelo sobre la capacidad de retención de agua del suelo se analiza utilizando conceptos derivados del modelo capilar. Sin embargo, estos análisis sistemáticamente fallaron para explicar las observaciones experimentales. En esta Tesis, se han evaluado los datos experimentales obtenidos en muestras de bentonita ensayadas a diferentes temperaturas y densidades usando una aproximación derivada a partir de conceptos de termodinámica de adsorción. Esta aproximación también define una herramienta para introducir en una manera simple el efecto de temperatura y densidad de la muestra en las simulaciones numéricas.<br/><br/>En general se supone que la interacción entre la esmectita, que es el principal mineral de la bentonita, y el agua cambia las propiedades del agua retenida en el suelo. En particular, experimentos a nivel mineralógico así como los datos obtenidos en muestras compactadas de arcilla expansiva sugieren valores de la densidad del agua mayores que 1.0 Mg/m3 (es decir, la densidad del agua libre). Desde un punto de vista práctico, este efecto se traduce en valores calculados del grado de saturación mayor que uno para valores bajos de succión. Este aspecto es importante cuando se realizan análisis numéricos, debido a que las ecuaciones de balance se basan en el grado de saturación como la principal variable para indicar el contenido de agua en el medio poroso. En esta Tesis se ha desarrollado una metodología que define la densidad del agua como una función de la energía del agua en los poros del suelo. Este método fue usado para analizar datos publicados de la capacidad de retención de agua de muestras compactadas de diferentes bentonitas.<br/><br/>El análisis de la respuesta mecánica de arcillas expansivas bajo acciones externas como aquellas típicamente encontradas en barreras de ingeniería es una tarea compleja. Los modelos constitutivos usados en los cálculos numéricos deben ser capaces de simular los principales aspectos de la respuesta material. En esta Tesis se han adoptado modelos previamente desarrollados para simular el comportamiento de muestras compactadas de arcilla expansiva. Los parámetros de estos modelos se calibraron usando datos experimentales que corresponden a muestras compactadas de bentonita MX-80, el material adoptado como referencia en el proyecto TBT.<br/><br/>Los conceptos desarrollados en esta Tesis se incorporaron en un código numérico capaz de resolver problemas acoplados en medios porosos deformables. Este código fue aplicado tanto para el análisis de un ensayo de maqueta como para la simulación del ensayo in situ, ambos desarrollados en el marco del proyecto TBT. Las simulaciones numéricas demostraron las capacidades del código para capturar la tendencia general de los datos experimentales. Además, el análisis de los resultados numéricos puso de manifiesto los diferentes fenómenos que tienen lugar en los procesos acoplados así como los mecanismos de interacción entre ellos.<br>This Thesis presents the results of the research carried out in the framework of the Temperature Buffer Test (TBT) project. The overall objective of this project is to investigate how well the bentonite used in engineered barriers can endure the high temperatures expected to be found around vitrified waste canisters. Within the project, a full-scale field test that simulates the deposition of high level radioactive waste has been implemented. Additionally, laboratory experiments were carried out to evaluate the response of the bentonite used in the project under different external actions.<br/><br/>Coupled formulations used to analyse the behaviour of an engineered clay barrier are written in terms of the state variables by using constitutive relations. Among these laws the soil water retention curve (SWRC) defines the constitutive relationship between the amount of water in the soil and its energy status. Traditionally, the influence of external variables like temperature and soil fabric on the water retention capacity of soils has been analysed using concepts derived from the capillary model. However, theses analyses systematically failed to explain the experimental observations. In this Thesis, experimental data obtained on bentonite samples tested at different temperatures and densities were evaluated using an approach derived from concepts of thermodynamic of adsorption. This approach also gives a tool to introduce in a simple way the effect of temperature and sample porosity in numerical simulations.<br/><br/>It is generally accepted that the interaction between smectite, which is the main mineral of bentonite, and water changes the properties of the water retained in the soil. In particular, values of the water density higher than 1.0 Mg/m3 (i.e. the density of the free water) have been suggested by experiments at mineralogical level as well as by data obtained on compacted samples of expansive clays. From a practical point of view this effect traduces in values of degree of saturation higher than one at lower values of suction. This is important when a numerical analysis is being performed, as balance equations are based on the degree of saturation as the main variable to indicate the water content within the porous medium. In this Thesis a methodology that defines the water density as a function of the energy of the water within the soil pores was developed. This method was applied to analyse published data about the water retention capacity for compacted samples of different bentonites.<br/><br/>The analysis of the mechanical response of expansive clays under external actions as those typically found in engineered barriers is a complex task. Constitutive models used in numerical calculations have to be able to simulate the main aspects of the material response. Models previously developed to simulate the behaviour of compacted samples made up of expansive clay were adopted in this Thesis. Parameters in these models were calibrated using experimental data corresponding to compacted samples of MX-80 bentonite, the material adopted as reference in the TBT project.<br/><br/>Concepts developed in the Thesis were included in a numerical code able to solve coupled problems in deformable porous media. This code was then applied to the analysis of a mock-up experiment and to the simulation of the in situ test carried out within the framework of the TBT project. Theses numerical simulations showed the capabilities of the code to capture the general tendency of the experimental data. Additionally, the analysis of numerical results enhanced the understanding of the different phenomena that take place in coupled processes as well as the interaction mechanisms between them.
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Lemmon, Kathryn Louise. "The use of dialogue journals in senior high English class." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ37353.pdf.
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Reddy, Anand Junuthula 1973. "Design principles for high performance, low environmental impact silicon cleans." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8767.
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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2001.<br>Includes bibliographical references (p. 130-133).<br>The production of future generation integrated circuit devices requires precise control of impurities on the silicon surface. Cleaning of silicon wafers has historically involved the use of concentrated chemicals, large amounts of rinse water, and elevated temperatures to remove particles, metals, and organic matter from the surface. Poor understanding of the mechanisms of contamination has necessitated large margins of error in cleaning processes and has made cleaning the largest consumer of resources in an IC process line. Explosive growth within the semiconductor sector coupled with the increased need for cleaning in device manufacturing presents an enormous burden for the natural environment. By better understanding the relevant parameters in a cleaning step, future process will continue meet performance specifications while simultaneously reducing their impact on the environment. The environmental performance of the manufacturer is limited by the available technologies for wafer cleaning. Design changes occurring at the tool, chemical, and system level all affect the overall environmental impact of a fab . A modified Cost of Ownership (CoO) expression based on the tool consumable cost (CC), footprint (F), yield (Y), throughput (T), and utilization (U) is presented as a guideline for identifying the next generation of 'green' technologies. Barriers to the implementation of an ideal wetbench are also discussed. The intrinsic silicon-HF interface provides a baseline for understanding the impact of contamination on the electronic quality of the surface. Minority carrier lifetime measurements made by Radio-Frequency Photoconductance Decay (RF-PCD) show that defects on this surface are not described by any known models for a single mid-gap, electronic state. A model is presented in which each physical defect introduces two coupled mid-gap states. By analogy with Pb-centers observed at the Si-Si02 interface, these states correspond to the three physical states of a dangling bond. The doublyoccupied state may play a role in native oxide growth and metal deposition; the unoccupied state is a likely site for attack during fluoride etching. Metal contaminants at the silicon-liquid interface have also been studied using RF-PCD. The deposition of part per trillion (ppt) levels of Cu is shown to increase by a factor of 17 .5 by using a 500: 1 solution of HF instead of a 100: 1 solution. This strong dependence arises from a shift in the electrochemical potential at the wafer surf ace. With the reduction in [Ir], the potential shifts to more cathodic values and causes the Cu deposition rate to increase. To prevent unacceptable levels of contamination from dilute HF solutions, the purity of a D:l HF bath must scale as D-1.78.<br>by Anand Junuthula Reddy.<br>Ph.D.
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Tse, Pui-sze. "A case study of using portfolio in a secondary 4 geography class." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B35676206.
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Compton, Alex D. "High-Efficiency Wideband Class-F Power Amplifier with Electronically Tunable Resonant Network." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1422547511.
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Woolverton, Sara. "Student perceptions of learning and knowing in a working-class high school /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/7835.
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Gilasgar, Mitra. "Reconfigurable high efficiency class-F power amplifier using CMOS-MEMS technology." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/460685.
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The increasing demand for wireless products to be part of our daily lives brings the need for longer battery lifetime, smaller size and lower cost. To increase battery lifetime, high efficiency power amplifiers (PAs) are needed; To make them smaller, integration or reconfiguration is aimed and to reach lower costs, technologies such as CMOS are final goals. However integration of high efficiency PA in CMOS is challenging due to the technology limitations which restricts the achievable output power and efficiency of the PA. In order to bring solutions for the above-mentioned requirements, in this thesis novel reconfigurable class-F PAs, frequency-reconfiguration, CMOS integration, impedance-reconfiguration and CMOS-MEMS implementation are addressed.
Starting with a single frequency operation, a novel class-F PA for mobile applications is proposed in which with a proper harmonic tuning structure the need for extra filtering sections is eliminated, achieving an excellent harmonic-suppression level. This topology uses transmission lines and is developed to cover multiple frequency bands for purpose of global coverage with aim of size reduction. Three novel frequency reconfigurable PAs are proposed using MEMS and semiconductor switches to accomplish class-F operation at two frequencies. The main novelty of this structure is that the reconfiguration is done not only at fundamental frequency but also at harmonics with reduced number of tuning elements. Moreover, by proper placement of the switches in the stubs, the maximum voltages over the switches are minimized. The proposed structure overcomes the narrow band performance of class-F, giving an efficiency more than 60% over a 225 MHz and 175 MHz bandwidth at 900 MHz and 1800 MHz respectively. Measurement results showed high performance at both frequency bands giving 69.5% and 57.9% PAE at 900 MHz and 1800 MHz respectively.
A novel CMOS class-F PA is proposed that controls up to the 3rd harmonic and can adapt to load variations due to the effect of the human body on mobile phones. It enables the integration of the PA with other devices in a single chip leading to better matching, higher performance, lower cost and smaller size. In addition, it achieves load impedance reconfigurability by using impedance tuner in its output network and by proper tuning of the network, effects of load variation on the performance are compensated. Two designs at 2.4 GHz have been done using either MOS varactors or MEMS variable capacitors as tuning devices. The design using MOS varactors show a maximum measured values of 26% PAE and 19.2 dBm output power for 50 load. For loads other than 50 ohm an improvement of 15% for PAE and 4.4 dB for output power is obtained in comparison to non-tuned one. The second design is done using MEMS variable capacitors integrated in CMOS technology through a mask-less post-processing technique. Simulations results for 50 ohm load show a peak PAE of 32.8% while delivering 18.2 dBm output power.<br>La creixent demanda de productes sense fils en la nostra vida diària requereix dispositius de menor grandària, menor cost i amb una gran autonomia. Per reduir la mida i augmentar l'autonomia és necessari utilitzar sistemes integrats multiestàndard o reconfigurables, amb amplificadors de RF d'alta eficiència, mentre que per reduir el cost, és preferible utilitzar tecnologies econòmiques com CMOS. No obstant això, la integració en CMOS d'amplificadors de radiofreqüència, i en especial, d'alta eficiència, és un repte a causa de les limitacions de la tecnologia que restringeixen la potència de sortida realitzable i l'eficiència de l'amplificador. En aquesta tesi es tracten els diferents reptes anteriorment esmentats, proposant una nova topologia d'amplificador classe-F amb reconfiguració de freqüència, i proposant la integració d'un amplificador classe-F que s¿adapta a impedància de càrrega variable, implementat en CMOS i CMOS-MEMS. Inicialment en la tesi es proposa una topologia d'amplificador classe-F en què, gràcies a una estructura adequada a la xarxa d'adaptació, s¿elimina la necessitat de filtrat extra, aconseguint un nivell de rebuig d'harmònics excel·lent. La topologia proposada utilitza línies de transmissió i s'ha desenvolupat per dues bandes diferents, amb el disseny orientat a implementar un sistema reconfigurable. S'han aconseguit PAE de l'ordre del 80 % amb potències properes a 10 W. Un cop descrita i analitzada la topologia, s'han proposat tres amplificadors reconfigurables per doble banda freqüencial. Per a la reconfiguració s'han utilitzat MEMS i commutadors basats en semiconductors. L'estructura proposada permet la reconfiguració no només en la freqüència fonamental sinó també en els harmònics, però mantenint un nombre reduït d'elements d'ajust. A més, gràcies a l'adequada col·locació dels commutadors en les línies de transmissió, s'ha minimitzat la tensió màxima en els mateixos. Així mateix, l'estructura proposada evita la característica de banda estreta a classe-F, proporcionant una eficiència superior al 60% en unes amplades de banda de 225 MHz i de 175 MHz, per a les banda de 900 MHz i 1800 MHz respectivament. En aquestes bandes, la PAE màxima mesurada és del 69,5% i del 57,9% respectivament. Finalment, s'ha proposat un amplificador integrat en CMOS, classe-F amb control fins al tercer harmònic. L'amplificador proposat incorpora un sintonitzador a la sortida, podent així adaptar-se a variacions d'impedància de càrrega, típiques en dispositius sense fil (WLAN), degudes a l'efecte del cos humà sobre l'antena. La implementació en CMOS permet la integració de l'amplificador de potència amb altres dispositius en un únic xip, donant lloc a una millor adaptació, millor rendiment, menor cost i menor grandària del sistema. A més, gràcies a l'adaptació a les variacions de la impedància de càrrega, permet mantenir el rendiment en diferents rangs d'operació. S'han realitzat dos dissenys de l'amplificador a 2,4 GHz, un basat en varactors MOS i un altre en condensadors variables MEMS. El disseny que utilitza varactors MOS mostra una PAE màxima del 26% i una potència de 19,2 dBm per a càrrega adaptada 50 ohm. Per altres càrregues, gràcies a l'adaptació d'impedància, s'obté una millora de PAE del 15% i de 4,4 dB en potència de sortida. El disseny utilitzant condensadors MEMS s'integra en CMOS gràcies a post-processat sense màscares addicionals. Els resultats de simulació per a 50 ohm mostren una PAE del 32,8% per 18,2 dBm de potència de sortida
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Kuanda, Tayari Atiba Azikiwe. "Social Class of High School Students and Influences on Student Engagement." Thesis, University of Redlands, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3687634.
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<p> This qualitative study focused on social class and its influences on student engagement in high school settings. The study employed a narrative inquiry approach. Through the examination of narratives of the participants, this study sought to discover the ways in which students, parents, teachers, and administrators think about, view, and act upon their understanding of social class as it relates to student engagement. The researcher conducted the study at three high schools in the Desert Mountain region of San Bernardino County located in Southern California. The schools were selected based upon their socioeconomic makeup as measured by the percentage of students who qualified for free and/or reduced lunch (PFRL). The narratives were all screened for emerging themes related to social class and student engagement. In addition, the narratives were analyzed to find instances of commonalities and differences. The results of this study revealed that social class is identified in various manners; it also revealed that although social class plays an important role in education, social class alone does not predict academic achievement. The results of this study may aid in increases to graduation rates, thereby an obvious reduction in dropout rates especially as it relates to social class. </p><p> Keywords: social class, engagement, influences, high school, policies, dropout rate.</p>
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Hagelauer, Patrick V. (Patrick Vincent). "Dynamics and sensitivity analysis of a class of high speed aircraft." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/46434.
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Nakagomi, S. "English middle-class girls' high schools and 'domestic subjects', 1871-1914." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1482135/.
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How ‘domestic subjects’, variously defined as cookery, dress-making, housewifery, laundry, needlework were transformed in English middle-class girls’ high schools between 1871 and 1914 is the subject of this thesis, dates deliberately chosen to build upon the work of other scholars. Changing notions of middle-class women’s positions in society and the economy influenced the development of these schools, their academic curriculum and the characteristics of ‘domestic subjects’. Middle-class girls’ education and the pioneer headmistresses such as Miss Frances M. Buss, founder of North London Collegiate School (NLCS) and Camden School for Girls (CSG), have been extensively studied by feminist historians of education such as Delamont (1978). The Victorian women’s movements were seen as a struggle for sexual and social equality through secondary and higher education. Miss Sara A. Burstall as headmistress of Manchester High School for Girls (MHSG) introduced ‘domestic subjects’ in 1900. Delamont saw this as a challenge to what earlier pioneers had achieved in the academic curriculum. ‘Domestic subjects’ had arguably been provided to meet the needs of girls with lower academic ability and/or lower social backgrounds within the high schools. I have found that the curriculum offered in girls’ high schools throughout the period 1871 – 1914 was more gender-specific than previous scholars had considered. ‘Domestic subjects’ such as cookery, dress-making had always been included even when the pioneering headmistresses were also struggling to achieve academic goals. The originality of my thesis lies in the comprehensive and detailed documentary analysis of previously unexplored sources for the period 1870-1914 of the Association of Head Mistresses (AHM), founded by Miss Buss, and those of the three case study school archives (NLCS, CSG and MHSG) and also books written by contemporary headmistresses such as Miss Burstall. Through a detailed analysis of these materials, I have revised the history of the transformation of ‘domestic subjects’. My findings show different stories of the transformation of ‘domestic subjects’ in the three case study schools which reflected the changing positions of middle class women in universities, labour market and home. First, ‘domestic subjects’ were a part of girls’ high school curriculum from their inception. Second, three stages were revealed with different contents, aims, staff and pupils as: a) separate compulsory subjects (1870s-1890s), b) special classes under the category of ‘technical’ education (1880s – 1890s) c) comprehensive special courses (after 1900). Third, the six headmistresses in the three schools reacted differently to the changing social, economic and educational environments considering the financial states of schools and demands of pupils and their parents. Fourth, staff and pupils involved in ‘domestic subjects’ were not limited to those with lower academic ability and/or lower social backgrounds of their parents. In conclusion, the changing characteristics of ‘domestic subjects’ in girls’ high schools can be seen as a move from Miss Buss to Miss Burstall: a difficult balancing act of academic and feminine roles at home, at school and in employment and responding to individual girls, local and parental needs and the growing role of the state, through its national Board of Education (BOE).
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Dar, Aqsa. "The educational careers of high-aspiring working-class British Pakistani women." Thesis, Open University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664475.
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This research is concerned with the barriers and opportunities experienced by working class British Pakistani women who aspired to higher education and to obtaining professional jobs. It examines the career trajectories of nine second generation British Pakistani women who were born in a working class area of a former textile town in the north of England. These women pursued educational qualifications as the means to acquire new knowledge and experiences and in order to secure higher status jobs. This is in marked contrast to the traditional trajectory which they saw other British Pakistani women following, of marrying and having children soon after leaving school. My informants viewed a career outside the home as affording advantages in terms of personal and social development, family pride and economic rewards. While, at the time of the research, some of them were still caught up in 'making themselves' in terms of their careers, others had already secured professional jobs. The women in this study reflect on changing ideas about British Pakistani womanhood, their educational routes to social mobility, and the effects of problematic perceptions of Pakistani Muslims in schools and workplaces. In this thesis I explore the kinds of cultural capital relevant to their careers, the obstacles they faced, and how they negotiated these. I conducted in-depth biographical interviews using a qualitative approach that was designed to be culturally sensitive, revealing how relationships with parents, siblings, peers, neighbours, teachers and colleagues, as well as local contexts and opportunities, feature in informants' lives. The study is a contribution to the small but growing literature that sets out to understand social mobility through qualitative research methods, exploring the processes involved. It also illuminates the life stories of a specific group of British Pakistani women at a particular time in their community's history.
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Lynn, Derek. "Implementing Writing in a Secondary Math Class to Improve Student Understanding of Math Concepts." Defiance College / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=def1281622037.
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Maughan, Steven Ashley. "High efficiency wide-band line drivers in low voltage CMOS using Class-D techniques." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/19570.
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In this thesis, the applicability of Class-D amplifiers to integrated wide-band communication line driver applications is studied. While Class-D techniques can address some of the efficiency limitations of linear amplifier structures and have shown promising results in low frequency applications, the low frequency techniques and knowledge need further development in order to improve their practicality for wide band systems. New structures and techniques to extend the application of Class-D to wide-band communication systems, in particular the HomePlug AV wire- line communication standard, will be proposed. Additionally, the digital processing requirements of these wide-band systems drives rapid movement towards nanometer technology nodes and presents new challenges which will be addressed, and new opportunities which will be exploited, for wide-band integrated Class-D line drivers. There are three main contributions of this research. First, a model of Class-D efficiency degradation mechanisms is created, which allows the impact of high-level design choices such as supply voltage, process technology and operating frequency to be assessed. The outcome of this section is a strategy for pushing the high efficiency of Class-D to wide band communication applications, with switching frequencies up to many hundreds of Megahertz. A second part of this research considers the design of efficient, fast and high power Class-D output stages, as these are the major efficiency and bandwidth bottleneck in wide-band applications. A novel NMOS-only totem pole output stage with a fast, integrated drive structure will be proposed. In a third section, a complete wide-band Class-D line driver is designed in a 0.13μm digital CMOS process. The line driver is systematically designed using a rigorous development methodology and the aims are to maximise the achievable signal bandwidth while minimising power dissipation. Novel circuits and circuit structures are proposed as part of this section and the resulting fabricated Class-D line driver test chip shows an efficiency of 15% while driving a 30MHz wide signal with an MTPR of 22dB, at 33mW injected power.
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Hayakawa, N., A. Ishiyama, N. Amemiya, et al. "Development of 66 kV and 275 kV Class REBCO HTS Power Cables." IEEE, 2013. http://hdl.handle.net/2237/20737.
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Grgurich, Aaron James. "DESIGN AND SIMULATION OF A GENERAL PURPOSE, CLASS-A AMPLIFIER FOR HIGH TEMPERATURE APPLICATIONS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1588049969718819.
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Thaden, Lyssa Luise. "An integrated approach to capital effects analysis of college going for the class of 2004 /." Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Dissertations/Spring2010/l_thaden_042310.pdf.
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Elliott, Susan F. "The Effects of a Reading Intervention Class on Regular Education High School Students Who Struggle with Learning." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/27417.
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The purpose of this study was to examine a reading initiative that was implemented with struggling 9<sup>th</sup> grade regular education students at a high school in northern Virginia. Pre and post tests of the Stanford Diagnostic Reading Test (SDRT), 4<sup>th</sup> Edition, were used to measure the reading performance of students enrolled in a reading intervention class compared to those in a control group. Attendance and discipline data were also collected and compared. Discussions with students enrolled in the reading class and representative artifacts (student work in portfolios, field notes from classroom observations and interview transcriptions) provided contextual elements to the study.
The quantitative results of the study were mixed. There was no statistically significant difference between students enrolled in the reading intervention class compared to those in the control group on academic performance, attendance, or behavior. Participants in the reading class scored higher on scanning (F (1, 29) = 11.21, p = .00) and vocabulary (F (1, 29) = 5.96, p = .02) than those in the control group.Qualitative results indicated that students enrolled in the reading class who learned comprehension, scanning, and vocabulary strategies did not uniformly apply them during reading in core content areas (English, mathematics, science and social studies).<br>Ed. D.
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Bing, Graham. "World class manufacture of precision metal parts in high volumes : innovation report." Thesis, University of Warwick, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439745.
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Tap, Relinde. "High-Wire Dancers: Middle-Class Pakeha and Dutch Childhoods in New Zealand." e-Thesis University of Auckland, 2007. http://hdl.handle.net/2292/1517.
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In contemporary New Zealand discourses the 1950s, 1960s and the early 1970s are seen as the era of the ‘Golden Weather’. This time came to an end when social change on an unprecedented scale took place from the end of the 1960s onwards. During the 1980s and 1990s the changes became very rapid due to transformations as part of the neoliberal reforms. Neoliberalism established new ways of governing the self through discourses of personal reflection, flexibility and choice as well notions of uncertainty, instability and risk. Risk discourses can be found at different junctures in New Zealand’s history, but contemporary discourses surrounding the self and childhood have shifted risk discourses in new ways. This has led to new regimes of rationality and practices of childhood and an increased governance of children and their families. This research documents the contexts and the interrelationships which influenced the new regimes of rationality and governance of childhoods in New Zealand. It also discusses the way a range of contradictory and conflictual cultural repertoires are negotiated and reproduced in the middle classes. In the last decades Pakeha and Dutch middle-class families in New Zealand have faced the prospect of declining fortunes. They have therefore adopted a cultural logic of childrearing which stresses the concerted cultivation of children. These regimes of concerted cultivation include risk discourses which affect everyday relationships and practices. This more global middle-class regime coexists with a local regime based on the New Zealand narrative of the time of the ‘Golden Weather’. Within this local repertoire a ‘typical’ New Zealand childhood is seen as safe and quite relaxed. This perceived childhood space is filled with beaches and other activities associated with nature which give children the opportunity and freedom to explore and develop a distinct Kiwi self. This local figuration is in contradiction with the often hectic pace of concerted cultivation and the anxieties surrounding risk discourses. Dutch middle-class parents in New Zealand also use concerted cultivation and they have adopted some of their host country’s figurations surrounding childhood and the outdoors. However, there is a difference in emphasis as Dutch parental narratives of self are more focussed on relationships with people rather than nature.<br>The Ministry of Social Development, Building Research Capacity in the Social Sciences Doctoral Research Award, The New Zealand-Netherlands Foundation, The Anthropology Department,University of Auckland.
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Tooker, Paul Arthur. "A case study of a high school special education beginning band class /." Access Digital Full Text version, 1995. http://pocketknowledge.tc.columbia.edu/home.php/bybib/12249919.
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Thesis (Ed.D.)--Teachers College, Columbia University, 1995.<br>Typescript; issued also on microfilm. Sponsor: Lenore Pogonowski. Dissertation Committee: Margaret Jo Shepherd. Includes bibliographical references (leaves 95-109).
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Wheaton, Pat. "High style and society : class, taste and modernity in British interwar decorating." Thesis, Kingston University, 2011. http://eprints.kingston.ac.uk/24563/.
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This thesis explores the way in which interior decorating developed as a practice during the interwar period in Britain and seeks to address broader contexts of gender, class, taste and styles. While traditional design histories have tracked the development of the interior design model through a direct sequence of movements and ideologies through the nineteenth and twentieth centuries, this thesis addresses issues which have been problematic within the context of art and design history. It acknowledges the more linear dimension of the original strand and seeks to offer a complementary appraisal which considers and appreciates the role of class, wealth and privilege and deconstructs boundaries which have marginalized gender and obscured certain important influences. The study examines the way in which decorators, many of whom were female, negotiated a design agenda which engaged with modernity without fully renouncing hard-fought signifiers of their class, taste and individuality. It argues that in the development of its practices, significant alliances were formed with fashion and that the vital role performed by media representation and social commentary underpinned its commercial profile and provided the public locus of its discourse. The nature of professional decorating is explored against a background of emerging practices in the first decades of the twentieth-century which included the antiques trade; grand scale establishments such as Lenygon & Morant, White Allom, Thornton-Smith and Keebles; department-store studios including those at Heal’s, Waring & Gillow and Fortnum & Mason; and individual practitioners and designers including Syrie Maugham, Sibyl Colefax, Dolly Mann and Ronald Fleming. In a period rife with social and political upheavals and conflicting ideologies as well as technological advancement and life-style changes, the study’s analysis aims to provide a broader understanding of the way in which decorators proactively negotiated such conditions and presented a cultural and aesthetic response to modernity through the diversity of their styles.
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Gallagher, Martin. "Experimental investigation of the aerodynamics of a class 43 high speed train." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7269/.
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This study aims to investigate the aerodynamic phenomena of passenger trains by undertaking a series of experimental investigations into the aerodynamics of a Class 43 high speed train (HST). A contextual research background is presented with regards to two significant aerodynamic phenomena - slipstreams and crosswinds. Model-scale experiments were undetaken on a l/25th scale HST model at the TRAIN rig moving model rig facility in order to measure slipstreams at a range of trackside positions and with different ballast heights. Crosswind effects were investigated through two model-scale tests and an extensive campaign of innovative train-based surface pressure measurements onboard an operational HST. A wind tunnel test investigated the flow field and pressure distribution around an HST power car and calculation of aerodynamic loads. A symmetrical pair of pressure taps at the train nose enabled yaw angle to be calculated at full scale. A scale-model test using a crosswind generator was undertaken and the magnitudes of aerodynamic loads compared very favorably with the wind tunnel data. The novel full scale it has been possible it isolate open-air data and gusts, and estimate the overturning forces due to crosswinds by a considered approach to surface pressure measurements.
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Santiago-GonzáIez, Juan Antonio. "Design of class E resonant rectifiers for very high frequency power conversion." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/84862.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 113-116).<br>Resonant rectifiers have important applications in very-high-frequency power conversion systems, including dc-dc converters, wireless power transfer systems, and energy recovery circuits for radio-frequency systems. In many of these applications, it is desirable for the rectifier to appear as a resistor at its ac input port. However, for a given dc output voltage, the input impedance of a resonant rectifier varies in magnitude and phase as output power changes. In this thesis, a design method is introduced for realizing single-diode "shunt-loaded" resonant rectifiers, or class E rectifiers, that provide near-resistive input impedance over a wide range of output power levels. The proposed methodology is demonstrated experimentally for 10:1 and 2:1 power range ratios at 30 MHz input frequency. Some design limitations are found and explained. Additionally, the performance of Schottky diodes in very high frequency (VHF) rectifiers is explored. It has been found that diodes have increased losses when switched at VHF and this phenomenon varies by manufacturer and device specifications. A study of diodes in Class E rectifiers is conducted to assess their performance in VHF rectification. Some good diodes are identified for VHF operation, including both commercial Si and SiC Schottky diodes and experimental GaN diodes. The foundations are laid for developing a library of diodes useful for this application. The resonant rectifier design methodology presented in this thesis uses a graphical approach based on normalized design curves. It enables a fast design with only a small amount of calculations needed and yields good accuracy in the final circuit. It is hoped that this design approach and the insights available from the design curves will prove to be useful in designing resonant rectifiers in applications that require resistive rectifier loads.<br>by Juan Antonio Santiago-GonzáIez.<br>S.M.
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Slater, David Hunter. "Class culture : pedagogy and politics in a Japanese working-class high school in Tokyo /." 2003. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3077076.
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Gorlewski, Julie A. "Inscribing class writing instruction in a working-class suburban high school /." 2008. http://proquest.umi.com/pqdweb?did=1542143911&sid=2&Fmt=2&clientId=39334&RQT=309&VName=PQD.
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Thesis (Ph.D.)--State University of New York at Buffalo, 2008.<br>Title from PDF title page (viewed on Nov. 19, 2008) Available through UMI ProQuest Digital Dissertations. Thesis adviser: Weis, Lois Includes bibliographical references.
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Covington, Linda E. "COTEACHING IN A HIGH SCHOOL HISTORY CLASS:." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-706.
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Coteaching is one instructional delivery model that purports to provide students
with supports they need to succeed in the general education setting. This case study used
qualitative methodology, which was supplemented by quantitative data, to explore the
instructional factors that may contribute to the achievement of high school students with
learning disabilities who are placed in a cotaught setting. An optimal environment was
created for coteaching and included careful selection of the cotaught team, support from
the campus administration, initial and ongoing training for the coteachers, and the
creation of common planning periods. Two cotaught classrooms were observed for one
semester, and five students with learning disabilities were selected from these
classrooms for observation and interview. Additional data included interviews with the
campus principal, campus teachers, and the coteachers, as well as weekly observations
using the Stallings Observation System. Interviews and observations suggested that there
was little change in teacher or student behaviors.
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SHIH-HSIANG, LIN, and 林世祥. "High Efficiency Class-D Audio Amplifier Design." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/17599257173454224387.
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碩士<br>聖約翰科技大學<br>電子工程系碩士班<br>97<br>For the fast growing of electric products, the consumer electronic products are designed toward the direction of tiny and portable. Audio amplifiers are mass needed in these products. The major demands of the consumer products, for example, are: power dissipation, product volume, and heat radiation. The most important design parameter of these is power efficiency. Increasing the power efficiency, it not only lasts the Class-D amplifier battery lives, but also operates in an extra low operating temperature.
This paper designs Class-D amplifies based on self-tuning master-slave architecture and sliding mode control architecture. They are implemented with TSMC 0.35um 2P4M CMOS process. By using double triangle-wave generators and double feedback circuits in self-tuning mater-slave architecture, the efficiency of Class-D amplifier is increased and the total harmonic distortion (THD) is decreased. The chip size is 1.575mm x 1.575mm. The measure results show that when the input voltage is 0.6V, the power dissipation is 204mW, and the power efficiency is 89%. Second, the sliding mode control Class-D amplifier is using the sliding mode control modulation and bridge-configured architecture. The chip size is 1.575mm x 1.575mm. The simulation results show that when the input voltage is 0.6V, the power dissipation is 2.13W, and the power efficiency is 90.2%.
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Huang, Chien-Chuen, and 黃千娟. "Class Management System for Vocational High Schools." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/39786784175730486685.
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碩士<br>華梵大學<br>資訊管理學系碩士班<br>98<br>Class is a place where teachers and students grow and study together. The main sources of knowledge in the classroom are derived from the teacher’s teaching and books. Teacher’s personal knowledge is experienced and intuitional, and the knowledge is learned and obtained from experience and information. The knowledge management uses the systematic and organized method to use, exchange, and create knowledge. The management of teacher’s knowledge is a progress for explicit tacit knowledge. The classroom management system can help the teachers to create and maintain a better learning environment. The main objectives of this study are the 12th grade students, and the goal of the proposed classroom management system is to provide the education-oriented information to enhance the intentions of getting further education and the admissions rates of the graduating students.
This paper uses the open-source course management system- Moodle to construct a knowledge management platform for the class management. This system is used for the teachers to put the relevant explicit knowledge, and it increases the exchange opportunities to enhance the interaction between the teachers and the students. The functions for the explicit knowledge are the bulletin board, the URLs for reference information, the question bank, and the notes database … etc. The user can upload the content of the physical knowledge for self-test and information sharing. In addition, the users can download the multimedia teaching materials. For the tacit knowledge, this system provides the forums for discussion and the exercises. All of the teachers and students can provide and get the responses using these interactive mechanisms. The students can get more information to decide the direction of further education. The results of this research can be a reference for the teachers of the vocational high school to build a knowledge management system for students to choose the school of further education.
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HUANG, YUEH-CHEN, and 黃月嬋. "Analyzing teacher behavior on high alt-pe class." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/92106131117811643205.
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Morgan, Robert Douglas. "Colloidal nanoparticles : a new class of laser gain media." Thesis, 2009. http://hdl.handle.net/2152/ETD-UT-2009-12-632.
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Development of high average power lasers has historically been limited by the properties of available gain media. As a result it is either too costly or impractical to employ lasers in many applications for which they would otherwise be well suited. We have synthesized a new type of colloidal laser gain material that should possess many of the advantages of solid state media without their primary disadvantage: poor thermal performance. The colloid consisted of an emulsion of 20% Nd+3 doped phosphate glass nanoparticles suspended in nonanoic acid. The spectroscopic properties of the material were found to be consistent with those of bulk Nd+3 doped materials and suitable for laser development.<br>text
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Fearnley-Sander, Mary. "Class and state high schooling in Tasmania, 1913-1925." Thesis, 1995. https://eprints.utas.edu.au/19638/1/whole_Fearnley-SanderMary1996_thesis.pdf.
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This thesis is concerned with investigating a particular historical situation to see if it
supports R.W. Connell's account of the competitive academic curriculum as a hegemonic
mechanism for the sorting of ruling class and working class children for the labour market.
The particular historical situation is the start of high schooling in Tasmania 1913-1925.
The historical inquiry is a micro study of a school enrolment and its wider community of
class relations.
The notion of the competitive academic curriculum as a hegemonic mechanism is
dependent on prior assumptions, both theoretical and historical, which conceptually
organise the historical field of inquiry and are themselves considered in the thesis for their
operability in a particular historical situation. Thus from an opening account of Connell's
class theory, the thesis looks in a series of inquiries for a ruling class identifiable on
Connell's criteria; at evidence for Connell's mode of ruling class rule and for the existence
of hegemonic relations in the curricula established in the period in both the University and
the high school. The culmination of the inquiry is the study, contextualised in this way, of
the performance of the working class and ruling class students enrolled at Hobart High.
In seeking empirical support for Connell's findings, an historical inquiry was undertaken
which has significance in its own right. The basis of the study of the students' class and
participation is the enrolment register of the school which includes a remarkable amount of
detailed information about the 2245 students who attended school in these years and from
which the student class and outcomes were reconstructed. Further research was required to
supplement the enrolment register material; to identify the business leadership in the
community of southern Tasmania and influences on the determination of the curricula in
both educational institutions.
The outcomes in this study for the hegemonic structure of relationships of the academic
curriculum with other curricula were unexpected, but Connell's model of class practice
provided a satisfying theoretical grip on one of the main findings of this thesis which is the
relationship between the construction of teachers and the maintenance of the status of the
academic curriculum.
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Anand, Abhishek, and Avinash Minz. "Design of high performance class B push pull amplifier." Thesis, 2013. http://ethesis.nitrkl.ac.in/4820/1/109EE0283.pdf.
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Class B push pull amplifier are the most commonly used circuit for amplification purpose due to its higher efficiency. In spite of having a very high efficiency, crossover distortion is one which severely affects the performance of Class B amplifier. It can be reduced by the use of op-amp as a negative feedback op-amp. The op-amp can also be used a buffer. The use of diode creates a dead band in the output voltage. The heating effect in the diode is reduced by the use of temperature compensation feedback resistor.
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Huang, Hsu-Yu, and 黃旭右. "High Output-Power High Linearity CMOS Class AB Audio Amplifier with Quiescent Current Control." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/81598010065314529844.
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碩士<br>國立交通大學<br>電機學院通訊與網路科技產業專班<br>95<br>With the advent of a highly-mobilized and individualized multimedia age, Class-D audio amplifiers with better power efficiency, among the applications of its kind, have gained a lot of attentions. However, in view of the fact that traditionally high output power, good linearity, and low distortion are expected in amplifiers alike, Class-D audio amplifiers may not be an ideal choice since it requires a complicated clock modulation or a compensatory control mechanism to make up to its poor output linearity. To look for an applicable alternative, therefore, this thesis puts forth a Class-AB linear audio amplifier that not only meets the design specification of business application, but also equips with features such as volume control, earphone output ports, short-circuit protection, and other functions desired in a multimedia product.
In general, a linear audio amplifier has a load impedance of approximately 8 ohm, so its output stage must have a compatibly large current drive, whose design has a significant influence on the quiescent current, power efficiency, and linearity. These deciding factors in designing a linear audio amplifier thus reveal the originality of this thesis: to rid the unwanted quiescent current of the output stage and unstable linearity resulted from process variation with a succinct structure. The Class-AB output stage adopts common-source power transistors with error amplifiers. By decreasing the gain of the error amplifier, the quiescent current is successfully controlled. Since the gain of the error amplifier will increase as the output power rises, it will therefore enhance the linearity. Besides, its output common mode range is the same as the supply voltage, which is sufficient enough to drive a smaller-sized power transistor to achieve the desired output power.
The chip is fabricated by the UMC 0.5um +/-20V2P2M high voltage process. It could undertake a high supply voltage ranging from 10V to 18V. The total harmonic distortion is approximately 0.060 % provided that the load impedance is 8 ohm and the output power is 2 watt under an 18V supply voltage.
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CHANG，YA-LUN and 張雅綸. "Studies of Confucian Analects Teaching on Class Climate and Class Life Attitude in Junior High School." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/22227650888067837532.
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碩士<br>聖約翰科技大學<br>機械與電腦輔助工程系碩士班<br>103<br>Studies of Confucian Analects Teaching on Class Climate and Class Life Attitude in Junior High School
Abstract
The study aimed to investigate the influence of Confucian Analects teaching on class climate and class life attitude in junior high school. A quasi experimental research method was adopted in the study, and participants were divided into the experimental group and the normal group. Pre-tests and post-tests of “Class Climate Scales” and “Class Life Attitude Scales” were given to the participants. A total of 50 students from a junior high school in New Taipei City were recruited in 15 weeks experiment. 25 students in the experimental group were given Confucian Analects course lessons, while the remaining 25 students in the normal group were given generic Chinese course lessons. The collected data was analyzed through statistical methods including the independent-samples t-test, the paired-samples t-test, and descriptive statistics, and was further illustrated by qualitative data. The main results of the study are as follows:
1. Significant differences were found between the two groups’ performance in the post-tests of “Class Climate Scales” and “Class Life Attitude Scales.”
2. The experimental group performed better than the control group in the post-tests of “Class Climate Scales” and “Class Life Attitude Scales.” That is, junior high school students that took Confucian Analects lessons had a better class climate and class life attitude than those that took general Chinese lessons.
3. There was no significant difference between genders in the experimental group in the pre-tests and post-tests of “Class Climate Scales” and “Class Life Attitude Scales.”
4. There were significant over moderate positive correlations between class life attitude and class climate.
Keywords: Confucian Analects, class climate, class life attitude, independent-samples t-test.
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Carter, Julie H. "The discourse of diversity in a working-class high school." 2005. http://wwwlib.umi.com/dissertations/fullcit/3179472.
Full textAbstract:
Thesis (Ph.D.)--State University of New York at Buffalo, 2005.<br>Title from PDF title page (viewed on Dec. 20, 2005) Available through UMI ProQuest Digital Dissertations. Thesis adviser: Lois Weis. Includes bibliographical references.