Дисертації з теми "Power dynamic"
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Demiray, Turhan Hilmi. "Simulation of power system dynamics using dynamic phasor models /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17607.
Hockenberry, James Richard. "Power system dynamic load modeling." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42594.
Geitner, Gert-Helge, and Guven Komurgoz. "Power Flow Modelling of Dynamic Systems." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-171305.
Bousnane, Kafiha. "Real-time power system dynamic simulation." Thesis, Durham University, 1990. http://etheses.dur.ac.uk/6623/.
Song, Xuefeng. "Dynamic modeling issues for power system applications." Texas A&M University, 2003. http://hdl.handle.net/1969.1/1591.
James, Iain B. "Dynamic characteristics of a split-power IVT." Thesis, University of Bath, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390305.
McCoy, Timothy J. (Timothy John). "Dynamic simulation of shipboard electric power systems." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12495.
Singhavilai, Thamvarit. "Identification of electric power system dynamic equivalent." Thesis, University of Strathclyde, 2011. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=15647.
Schwingshackl, Christoph Wolfgang. "Dynamic behaviour of inhomogeneous multifunctional power structures." Thesis, University of Southampton, 2006. https://eprints.soton.ac.uk/52007/.
Xia, Xiuxian. "Dynamic power distribution management for all electric aircraft." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/6285.
ALBUQUERQUE, MARCOS ANTONIO. "DYNAMIC AGGREGATION OF DUAL-INPUT POWER SYSTEM STABILIZER MODELS TO CALCULATE DYNAMIC EQUIVALENTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2002. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=3278@1.
Esta dissertação trata do problema da agregação dinâmica de modelos de estabilizadores com dupla entrada, aplicados em reguladores de tensão de unidades geradoras coerentes, visando o cálculo de equivalentes dinâmicos precisos para estudos de estabilidade transitória de sistemas de energia elétrica. A metodologia utilizada para o cálculo de equivalentes dinâmicos é baseada em coerência de geradores, e apresenta três etapas básicas: a identificação de unidades geradoras coerentes, a redução estática da rede externa, e a agregação dinâmica dos geradores de cada grupo formado. A agregação dinâmica de um grupo de unidades geradoras coerentes permite a formação de uma ou mais unidades geradoras equivalentes. Haverá um modelo equivalente para cada componente da unidade geradora, ou seja, modelos equivalentes de máquina síncrona, sistema de excitação, estabilizador, turbina e regulador de velocidade. O ajuste numérico dos parâmetros lineares da função de transferência equivalente é feito pelo método de Levenberg-Marquardt, de modo a minimizar o erro entre a resposta em freqüência desta função e a da função de transferência agregada, que representa a soma das funções de transferência individuais das unidades de cada grupo. Isto caracteriza um problema de otimização multivariável. As respostas em freqüência são apresentadas em diagramas de Bode (módulo e fase). A avaliação do desempenho dinâmico dos equivalentes é feita no sistema teste New England, comparando-se as curvas de oscilação dos geradores do sistema interno obtidas em simulações com a rede completa e com o equivalente. Os modelos de estabilizadores com dupla entrada utilizados são do banco de dados do sistema elétrico brasileiro.
This dissertation deals with the problem of dynamic aggregation of dualinput stabilizer models applied on voltage regulators of coherent generating units to calculate dynamic equivalents for power system transient stability studies. The methodology used for the calculation of coherency-based dynamic equivalents has three basic steps: the identification of the coherent groups of generating units, the network reduction and the dynamic aggregation of coherent generator models. The dynamic aggregation of a group of coherent generating units attached to a common busbar consists of the representation of this group by one or more equivalent generating units. There will be an equivalent model for each component of the generating unit, i.e., an equivalent model for the synchronous machine, other one for the excitation system, and so on. The linear parameters of the equivalent transfer function are numerically adjusted to match the frequency response of the corresponding aggregated transfer function which represents the sum of the individual transfer functions for each coherent group. This characterises a multivariable optimization problem. The frequency responses are presented in Bode diagrams (magnitude and phase). The dynamic equivalents are evaluated in the New England system. The swing curves of the internal system generators obtained with the complete system are compared with those obtained with the equivalent system. The dual-input power system stabilizer models considered in this work are in the Brazilian system stability database.
Hakobyan, Aram P. "Severe accident analysis using dynamic accident progression event trees." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1158672136.
Bystrøm, Vebjørn. "Low power/high performance dynamic reconfigurable filter-design." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8899.
The main idea behind this thesis was to optimize the multipliers in a finite impulse response (FIR) filter. The project was chosen because digital filters are very common in digital signal processing and is an exciting area to work with. The first part of the text describes some theory behind the digital filter and how to optimize the multipliers that are a part of digital filters. The substantial thing to emphasize here is the use of Canonical Signed Digits (CSD) encoding. CSD representation for FIR filters can reduce the delay and complexity of the hardware implementation. CSD-encoding reduces the amount of non-zero digits and will by this reduce the multiplication process to a few additions/subtractions and shifts. In this thesis it was designed 4 versions of the same filter, that was implemented on an FPGA, where the substantial and most interesting results were the differences between coefficients that was CSD-encoded and coefficients that was represented with 2's complement. It was shown that the filter version that had CSD-encoded coefficients used almost 20% less area then the filter version with 2's complement coefficients. The CSD-encoded filter could run on a maximum frequency of 504,032 MHz compared the other filter that could run on a maximum frequency of 249,123 MHz. One of the filters that was designed was designed using the * operator in VHDL, that proved to be the most efficient when it came to the use of number of slices and speed. The reason for this was because an FPGA has built-in multipliers, so if one has the opportunity to use the multiplier they will give the best result instead of using logic blocks on the FPGA It was also discussed a filter that has the ability to change the coefficients at run-time without starting the design from the beginning. This is an advantage because a constant coefficient multiplier requires the FPGA to be reconfigured and the whole design cycle to be re-implemented. The drawback with the dynamic multiplier is that is uses more hardware resources.
Caharija, Walter. "Dynamic Bias for RF Class A Power Amplifiers." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9998.
This thesis focuses on class A radio frequency power amplifiers in dynamic supply modulation architectures (dynamic bias). These are promising efficiency enhancement techniques where the device is driven harder by varying its bias signals. Non linearities that arise are considered as digitally compensated through, for example, digital predistortion (DPD). Bias signals are meant as functions of the PA?s output power level (P out). Therefore, the input power level (P in) as well as the feeding signals are thought as quantities the amplifier need to give a certain P out. The selected set of bias points the device sweeps through is called bias trajectory or bias path. A tool to find a suitable bias trajectory is developed considering the requirements a class A power amplifier should satisfy: high power added efficiency, acceptable gain and output phase variations as P out changes (allowing a DPD algorithm to be effective), low harmonic distortion and not too complicated bias signals patterns. The tool consists of two softwares: ADS and Matlab. ADS simulates the device under test while Matlab allows the user to analyze the data and find a suitable bias path. Once a trajectory is identified, ADS can sweep along it and give more information on linearity and efficiency through, for instance, 2-tone harmonic balance simulations. Note that only static characteristics are evaluated and memory effects disregarded. The path searching algorithm is then applied to a HBT transistor, at a frequency of 1.9GHz and to a complete pHEMT class A PA (frequency of 6Ghz). In both cases a suitable trajectory is identified and analyzed back in ADS. The Matlab plots are qualitatively similar to each other when switching form one device to another. The HBT transistor has then been tested in the laboratory and static measurements have been performed showing good agreement with simulations. Keywords: Bias trajectory, dynamic bias, efficiency, HBT, linearity, pHEMT, power amplifier
Brynjolfson, Ian. "Dynamic clock management circuits for low power applications." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32954.
Medina, Juan Felipe Miranda. "Dynamic biasing for linear power amplifier efficiency enhancement." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20045.
Crawford, Paul M. "Dynamic study of factors impacting on combat power/." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23187.
SIQUEIRA, MAGDA SAMPAIO DIOGO DE. "HIERARCHICAL DYNAMIC STATE ESTIMATION FOR ELECTRIC POWER SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1985. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9464@1.
In many countries, huge power networks are formed from the interconnection of electric power companies each one having its own supervisory control center. In order to supervise efficiently such power systems, hierarchical state estimation techniques have to be considered. This dissertation presents a new algorithm using hierarchical concepts to solve the dynamic state estimation problem for large-scale electric power systems operating under quasi-static conditions. A two-level calculation is performed to give a satisfactory solution from the computational point of view for the usual steps of the dynamic state estimation procedure: model parameter estimation, state prediction and state filtering. At the local level, conventional dynamic state estimation algorithms are carried out simultaneously and independently for all subsystems. The coordination of these local estimations is obtained at a national center for supervision and control, which is at the top of operational hierarchy in the interconnected electrical system. Numerical results show the performance of the proposed algorithm under different operational conditions: normal, sudden variation of states and occurrence of bad data.
Kitimbo, Andrew. "Rating of Power Cables for Dynamic Load Situations." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-195113.
The overall objective of the project was to evaluate the viability of applying dynamic rating to the dimensioning of offshore wind farm power export cables, usually three core armoured cables. Following various publications in the cable industry indicating that the armour loss estimation methods proposed by IEC for three core armoured cables are overly conservative, the project aimed to develop models for more accurate estimation of the armour losses of three core armoured cables so as to realise less conservative cable rating calculations. Models were developed for offshore wind farm export cables for the typical installation conditions in which these cables are applied. The models were then validated with measurements of cable temperature evolution with loading taken for the power export cable of Eegmond aan Zee offshore wind farm located in the North Sea. The validated models for power cables in the different installation environments relevant for offshore wind farm power export cables were then used to perform cable rating calculations for the power export cable circuits of one of the proposed East Anglia offshore wind farms. The power profile with time as expected to be generated from the wind farm was applied to the models for the cable rating analyses. As part of the modelling process, the capabilities of Cymcap, a commercially available software tool for the rating of power cables were compared with those of Comsol Multiphysics, a finite element tool, for steady state and dynamic cable rating calculations. For purposes of achieving less conservative cable rating results than would have been obtained with IEC methods, a good understanding of the behaviour of the armour losses in submarine cables was obtained from various publications. Two concepts understood to be important in the estimation of the armour losses were that the losses are due to the magnetic field component parallel to the armour wires and that their magnitude is influenced by the crossing pitch between the power cores and the armour wires of the cable. For accurate estimation of the armour losses, 3D FEM models are required for the entire complex cable geometry which was not possible with the available computing resources. Approximate expressions for the magnetic field parallel to the armour wires were obtained and applied to 3D and 2D FEM models of individual armour wires to compute the armour losses. The results with 3D FEM were similar to those obtained with 2D FEM. However, a comparison of the armour loss estimates obtained with two different expressions for the magnetic field gave varying results for the armour losses and their dependence on the crossing pitch making it difficult to draw any conclusions on the exact relationship between the armour losses and the crossing pitch. Secondly, the unavailability of any information on the crossing pitch between the power cores and the armour wires of the cables used in the study also made it difficult to draw conclusions on the armour losses of these cables from the models. The armour losses eventually used in the cable rating calculations were estimates based on the armour losses obtained from published results of 3D FEM simulations of a cable of similar dimensions. In the validation of the models, the results from the models of buried cables showed close agreement with the measurements. However, for cables in J tubes, the inability of 2D models to capture convective heat transfer resulted in large deviations between the results from the models and the measurements. From the cable rating analyses, the conductor temperature attained with dynamic loading was observed to be less than that from steady state loading for the same cable dimensions. This indicated that it was possible to use smaller conductor cross sections when using dynamic rating than with steady state rating of offshore wind farm power export cables.
Perez-Davis, Marla Esther. "Heat receivers for solar dynamic space power systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=case1055525095.
Das, Debrup. "Dynamic control of grid power flow using controllable network transformers." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43739.
Deaton, Juan D. "Evaluation of Dynamic Channel and Power Assignment Techniques for Cognitive Dynamic Spectrum Access Networks." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/42165.
Master of Science
Rousseau, Jean-Pierre. "Dynamic evaluation of the solar chimney." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1184.
Smith, Mark Allen. "Improved dynamic stability using FACTS devices with phasor measurement feedback /." This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-05022009-040702/.
Krishnan, Venkat Kumar. "Coordinated static and dynamic reactive power planning against power system voltage stability related problems." [Ames, Iowa : Iowa State University], 2007.
Blood, Ellery A. "From Static to Dynamic Electric Power Network State Estimation: The Role of Bus Component Dynamics." Research Showcase @ CMU, 2011. http://repository.cmu.edu/dissertations/57.
Shaaban, Mohamed Mohamed Abdel Moneim. "Calculation of available transfer capability of transmission networks including static and dynamic security." Thesis, Click to view the E-thesis via HKUTO, 2002. http://sunzi.lib.hku.hk/hkuto/record/B42576817.
Li, Bo. "Modeling and Runtime Systems for Coordinated Power-Performance Management." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/87064.
Ph. D.
System efficiency on high-performance computing (HPC) systems is the key to achieving the goal of power budget for exascale supercomputers. Techniques for adjusting the performance of different system components can help accomplish this goal by dynamically controlling system performance according to application behaviors. In this dissertation, we focus on three techniques: adjusting CPU performance, memory performance, and the number of threads for running parallel applications. First, we profile the performance and energy consumption of different HPC applications on both Intel systems with accelerators and IBM BG/Q systems. We explore the trade-offs of performance and energy under these techniques and provide optimization insights. Furthermore, we propose a parallel performance model that can accurately capture the impact of these techniques on performance in terms of job completion time. We present an approximation approach for performance prediction. The approximation has up to 7% and 17% prediction error on Intel x86 and IBM BG/Q systems respectively under 19 HPC applications. Thereafter, we apply the performance model in a runtime system design for improving performance under a given power budget. Our runtime strategy achieves up to 20% performance improvement to the baseline method.
Newham, Nikki. "Power System Investment Planning using Stochastic Dual Dynamic Programming." Thesis, University of Canterbury. Electrical and Computer Engineering, 2008. http://hdl.handle.net/10092/1975.
Forsén, Rikard. "Dynamic pressure measurements in high power impulse magnetron sputtering." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-52551.
A microphone has been used to measure the dynamic pressure inside a vacuum chamber during high power impulse magnetron sputtering with high enough time-resolution (~µs) to track the pressure change during the discharge pulse. An experimental measurement of the dynamic pressure is of interest since it would give information about gas depletion, which is believed to dramatically alter the plasma discharge characteristics. This investigation has shown that the magnitude of the pressure wave, which arises due to the gas depletion, corresponds to a 0.4 - 0.7Pa (3 - 5.5mTorr) pressure difference at a distance of 15cm from the target, with base pressures of 2 - 6mTorr for a peak current of 110A. It has also been shown that another pressure wave, about 250µs later, can be detected. Its explanation is suggested to be that the initial pressure wave is bouncing against the chamber walls and thereby causing another peak.
Kramer, Joshua. "A dynamic power optimization methodology for gigabit electrical links." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 134 p, 2007. http://proquest.umi.com/pqdweb?did=1397913001&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Domeij, Martin. "Dynamic avalanche in Si and 4H-SiC power diodes /." Stockholm, 1999. http://www.lib.kth.se/abs99/dome0604.pdf.
Hu, Fei. "Process variation-resistant dynamic power optimization of VLSI circuits." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Fall/Dissertation/HU_FEI_35.pdf.
Liu, Xiaopeng. "Power system dynamic vulnerability under extreme transmission line contingencies." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18782.
Les réseaux électriques peuvent être sous la menace de conditions extrêmes, tels que désastres naturels et attentats terroristes. Pour déterminer la condition la plus sévère en état stationnaire, des méthodes systématiques utilisant des techniques d'optimisations ont été développées. Jusqu'à présent il n'existe cependant pas de méthodes systématiques pour déterminer quel défaut est le plus sévère en régime dynamique. Cette thèse propose une telle méthode. Elle utilise une approche en deux étapes, « triage et classement », similaire à celle utilisée dans une analyse de sécurité dynamique conventionnelle. Dans l'étape de triage, les lignes de transport d'électricité sont sélectionnées selon deux critères. Le premier est basé sur la sensibilité critique des valeurs propres par rapport à la perte d'une seule ligne. Une ligne de transport est sélectionnée seulement si une des valeurs propres critiques a une sensibilité élevée à la perte de cette ligne. Le second critère est basé sur une analyse topologique et recherche des ensembles de coupure dans le système. Une ligne de transport est sélectionnée si elle appartient à un ensemble de coupure avec un déséquilibre de puissance élevé. Dans l'étape de classement, une analyse temporelle est effectuée sur toutes les combinaisons possibles des lignes de transport sélectionnées dans la première étape, afin de déterminer leurs véritables impacts dynamiques sur le réseau électrique. Les relais de protection sont représentés. Les résultats des simulations sur le système test IEEE96 démontrent que l'étape de triage peut réduire le nombre de défauts de manière significative, ce qui peut alléger considérablement le fardeau de calcul dans l'étape de classement. Les défauts les plus sévères en termes de délestage étaient identifiés dans la plupart des cas par la méthode proposée. L'intérêt de la méthode réside dans sa simplicité,$
Roa-Sepulveda, C. A. "Dynamic simulation of voltage instability phenomena in power systems." Thesis, Imperial College London, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390456.
Wu, I. Hsuan, and 吳怡萱. "Online Dynamic Power Management." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/96202739734085858463.
SRIVASTAVA, MAYANK. "LOW POWER PSEUDO DYNAMIC BUFFER WITH DYNAMIC LOGIC." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14506.
Falahi, Milad. "Dynamic Reactive Power Control of Isolated Power Systems." Thesis, 2012. http://hdl.handle.net/1969.1/148126.
"Nonlinear dynamic maximum power theorem." Massachusetts Institute of Technology, Research Laboratory of Electronics, 1987. http://hdl.handle.net/1721.1/4218.
Bibliography: p. 12-13.
Supported in part by the National Science Foundation ECS-83-10941 Supported in part by the Defense Advanced Research Projects Agency under contract no. N00014-80-C-0622
Steven and 蔡志昇. "Power Minimization for Dynamic PLAs." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/76450333169387645831.
國立清華大學
資訊工程學系
91
Dynamic PLAs which are built of the NOR-NOR structure have been very popular in high performance design because of their high speed and predictable routing delay. However, the NOR-NOR structure incurs high switching activity in product lines and thus results in large power consumption. In this paper, we propose a new dynamic PLA structure which incorporates super product lines. A super product line adds the NAND functionality on top of the NOR structure, thus lowering the switching activities in the product lines as well as power consumption. Since there are many candidates for the super product lines, we have developed a CAD algorithm based on the maximum weighted matching to find optimal solution. In addition, the line reordering method is applied to further reduce the power consumption. We have performed experiments on a large set of MCNC benchmark circuits. Our experimental results not only show significant reduction in power but also the delay. On the average, the power consumption can be saved 54.86% and the delay can be improved 17.12%.
Senapati, Prasanta Kumar. "Low power dynamic comparator design." Thesis, 2014. http://ethesis.nitrkl.ac.in/6386/1/E-21.pdf.
Wu, Shang-Wei, and 吳尚瑋. "Effects of Large Power Plant on Power System Dynamic Stability." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/51793288745215208727.
國立臺灣海洋大學
電機工程學系
96
The main objective of this thesis is to study the dynamic stability characteristics of a power system with a large power plant installed for operation. The method of frequency domain analysis is utilized for the study with which the eigenstructure (eigenvalues with associated eigenvectors and participation factors) of each electromechanical oscillation mode can be computed for the analysis of system dynamic stability. Electromechanical oscillations include inter-area mode and intra-area (local and intra-plant) mode of oscillations. The inter-area mode often has lower frequency and damping ratio and affects relatively more numbers of generators. In this thesis, the eigenstructures of all electromechanical oscillation mode of the studied power system, with longitudinal structure and four geographic (northern, central, southern, and eastern) areas, are first computed. The results show that the system damping conforms to the criterion of dynamic stability under both peak load and light load operations. There is relatively more power imbalance between areas under light load since a net power is transferred from the northern area to the central area due to the operation of pumped storage units, and thus the damping ratio of the system under light load is lower than that under peak load. It is recommended that the inter-area oscillation mode be the focus of dynamic stability study for the studied system.
Singh, Mohit 1982. "Dynamic models for wind power plants." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-3809.
text
Kumar, Amit 1978. "Dynamic power reduction using data gating." Thesis, 2006. http://hdl.handle.net/2152/30338.
text
Lin, Kuo Chi, and 林國基. "Dynamic Power Control in Fading Channel." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/49969734335246694483.
HUANG, ZHONG-GING, and 黃鐘慶. "Long-term power system dynamic analysis." Thesis, 1987. http://ndltd.ncl.edu.tw/handle/32645466904050563900.
WANG, LI, and 王醴. "Analysis of power system dynamic stability." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/45625016847724142637.
Gonçalves, Mário Rui Adrião. "Dynamic response of WC-Ni power." Master's thesis, 2016. http://hdl.handle.net/10316/37018.
Este trabalho teve principal objetivo estudar o comportamento dinâmico do sistema WC-Ni, Ni = 9%pd, sob a forma de pó. Para taxas médias de deformação utilizou-se a técnica experimental Split Hopkinson Pressure Bar (SHPB). Os resultados obtidos, no que concerne os estados de tensão e de deformação, assim como a velocidade do som no pó durante a ação de uma carga dinâmica, foram conseguidos por modificação da conceção da SHPB. Após colocação da amostra em pó num tubo, este foi comprimido por ação das barras de Hopkinson. Conseguiu obter-se a tensão e a deformação axial na amostra WC-9Ni. Foi ainda necessário colocar um extensómetro na direção circunferencial do tubo contendo o material de forma a estimar-se o valor de tensão radial na amostra. Para taxas elevadas de deformação, as propriedades de Hugoniot do material em pó foram avaliadas por onda de choque plana utilizando um canhão de gás. Para tal projetou-se uma configuração de alvos múltiplos de modo a conter três grupos de amostras. A partir dos ensaios de compressão SHPB observou-se um comportamento dinâmico particular do sistema WC-9Ni, tendo sido identificadas duas fases. As causas para tal comportamento permanecem por esclarecer.
Cheng, Tung-Shuan, and 鄭東栓. "Dynamic Body-Biasing and Power-Gating Techniques for Low Power Design." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/w37uu9.
國立交通大學
電子工程系所
92
The low-power circuit designs using dynamic body-biasing and power-gating techniques are realized in this thesis. For the flexibility and reusability in System-on-Chip designs, an on-chip configurable body-bias generator that produces various voltage levels is proposed and simulated in TSMC 100nm technology. The output voltage can be controlled through digital input signals. A dual-level on-chip body-bias generator is presented and combined with SRAM cell arrays to observe the effectiveness in leakage suppression. Simulation results in TSMC 0.13um technology show that 75% and 64% net cell leakage reductions are achieved for 64-bit and 32-bit wordlines, respectively. The physical layout is implemented in TSMC 0.13um technology and triple-well structure is necessary for separating body nodes of transistors. A column/row co-controlled SRAM cell arrays scheme is also proposed and simulations and layout are implemented in TSMC 0.13um technology. The cells on the same wordline are divided into blocks and each block has a dedicated gating device. The gating devices are controlled by signals from both column and row decoders. Simulation results show a great amount of active and standby power saving and power-delay product demonstrates that the induced performance overhead is insignificant. Moreover, the area overheads for 8-bit block and 16-bit block conditions are 20.7% and 12.1%, respectively, and only 8.1% is for 32-bit block condition. This technique can be applied to SRAM, register file, CAM, DRAM, flash memory, cache, or other similar memory and logic circuits.
Chen, Jin-jia, and 陳晉嘉. "Transmission Power Dynamic Adjust Algorithms:Adjust MN’s Transmission Power in AdHoc Network." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/36847292329695274426.
國立臺灣科技大學
電子工程系
96
The Nodes of Ad Hoc network may run in a noisy environment. This will degrade the quality of the channel. When the level of noise is increased, the throughput of the network will be decreased. Since the nodes in Ad Hoc network use IEEE 802.11 DCF protocol and send frames with max power, the interference from other nodes will create noisy environment and the throughput will be decreased and collision probability will be increased. In this paper, we present a protocol named Transmission Power Dynamic Adjust Algorithms (TPDAA) for Ad Hoc network. When a node needs to sends data, its MAC layer calculates the changed noise level of the past. In this way, the sender can calculate the needed power level under present noise level. The collision probability will be decreased and SNR of channel will be more stable under this scheme. For a specific routing protocol, a node can adjust the number of neighbors with this power control scheme and achieve better performance for Ad Hoc network.