Дисертації з теми "Low latitude current system"
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Tsunomura, Satoru. "On the Contribution of Global Scale Polar-originating Ionospheric Current Systems to Geomagnetic Disturbances in Middle and Low Latitudes." 京都大学 (Kyoto University), 1999. http://hdl.handle.net/2433/182006.
Повний текст джерелаYokoyama, Yoshihiro. "Characteristics of the mesoscale field-aligned currents in the dusk sector of the auroral oval based on data from the Swarm satellites." Kyoto University, 2021. http://hdl.handle.net/2433/261602.
Повний текст джерелаShao, Hui. "System design and power management for ultra low energy applications using energy harvesting techniques /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?ECED%202009%20SHAO.
Повний текст джерелаFINARDI, ILARIA. "Traceable low-current measurements towards the realisation of the ampere in the new SI." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2745712.
Повний текст джерелаGrundmark, Sofia. "The current tax system on the Swedish residential market – problems and possible solutions." Thesis, KTH, Fastigheter och byggande, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150794.
Повний текст джерелаThe Swedish housing market is presently characterized by low mobility. This could partly be a result of the high taxes on moving from one house to another. Not only is there a capital-gains tax on moving, but also a stamp duty, a service charge and an interest charge on postponed capital gains tax. Many households consider the price of moving too high, making them reluctant to move. This will have a negative effect on the labour market due to the fact that people will be less willing to move to places where labour is needed. This type of behaviour will ultimately affect both the wealth of the individual and Sweden’s economy in a negative way. The purpose of this thesis is to examine the current tax-system and emphasize the problems with it. Firstly, a literature study will be presented to give a wide perspective of the subject. This will be the basis for a number of suggestions that will resolve the problem with low mobility on the housing market. After this, an investigation of how much money the taxes on moving actually generate to the government. Lastly, a calculation of how high a real estate tax would have to be in order to replace the taxes on moving. The conclusions of this paper suggest that there are a number of actions that can be taken in order to resolve some of the problems with the tax system on the Swedish housing market. The calculations show that the taxes on moving could be replaced by a real estate tax where the homeowners would pay 5900 SEK or 0,47% of the assess value of the home yearly, instead of paying taxes only when moving.
Baggu, Murali Mohan. "Advanced control techniques for doubly fed induction generator-based wind turbine converters to improve low voltage ride-through during system imbalances." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Baggu_09007dcc806684bd.pdf.
Повний текст джерелаVita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed May 27, 2009) Includes bibliographical references (p. 126-130).
MOSCA, CARMELO. "Methodologies for Frequency Stability Assessment in Low Inertia Power Systems." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2895393.
Повний текст джерелаGeury, Thomas. "Smart matrix converter-based grid-connected photovoltaic system for mitigating current and voltage-related power quality issues on the low-voltage grid." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/243967.
Повний текст джерелаDoctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Carbonell, Cortés Carla. "Customizing a low temperature system for microwave transmission measurements. Quantum transport in thin TiN films and nanostructures." Doctoral thesis, Universitat de Barcelona, 2012. http://hdl.handle.net/10803/83635.
Повний текст джерелаEl treball que es presenta en aquesta tesi consta de dues parts ben diferenciades. La primera pretén el desenvolupament d’un equip experimental concebut per a l’estudi de propietats magnètiques i elèctriques en materials diversos i, en especial, el treball amb radiació de microones en condicions de reflexió i transmissió. La segona s’ha centrat en les mesures de transport d’una capa fina superconductora de nitrur de titani (TiN) de 5 nm de gruix en un criòstat de dilució.
Latzo, Curtis Thomas. "Approaches to Arc Flash Hazard Mitigation in 600 Volt Power Systems." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3198.
Повний текст джерелаBolgár, Robert. "Posouzení možností regulace napětí v distribučních sítích nn." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220155.
Повний текст джерелаPic, Axel. "Numerical and experimental investigations of self-heating phenomena in 3D Hybrid Bonding imaging technologies." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI054.
Повний текст джерелаIn this PhD thesis, self-heating phenomena are studied for guiding the design of next-generation 3D Integrated Circuits (ICs). By means of experimental and numerical investigations, associated heat dissipation in 3D Hybrid Bonding imagers is analyzed and the impact of the resulting temperature rise is evaluated. First, in order to develop accurate models, the thermal properties of materials used in ICs are to be determined. Different dielectric thin films involving oxides, nitrides, and low-k compounds are investigated. To do so, Scanning Thermal Microscopy (SThM) and the 3ω electrothermal method, sensitive to low and large effective thermal conductivity, are implemented. In a second step, finiteelement models of 3D ICs are developed. A numerical method involving homogenization and a multiscale approach is proposed to overcome the large aspect ratios inherent in microelectronics. The numerical procedure is validated by comparing calculations and experimental measurements performed with SThM, resistive thermometry and infrared microscopy on a simplified Hybrid Bonding test chip. It is shown that heat dissipation is mainly limited by the heat sink conductance and the losses through air. Finally, numerical and experimental studies are performed on fully-functional 3D Hybrid Bonding imagers. The temperature field is measured with SThM and compared with finite-element computations at the die surface. The numerical results show that the temperature of the pixel surface is equal to that of the imager Front-End-Of-Line. The influence of the temperature rise on the optical performance of the imager is deduced from the analysis. The study also allows assessing the various numerical and experimental methods for characterizing heat dissipation in microelectronics
Chen, Her-Yuan, and 陳鶴元. "The simulation of low latitude ionospheric tomography by using ITS system." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/eqs26p.
Повний текст джерела國立中央大學
太空科學研究所
94
The Low Latitude Ionospheric Tomographic Network (LITN) suitable for the study of lare scale ionosphere structure , especially in the Taiwan area , we can study the large scale electron density variation in the equatorial anomaly region . In the past, NCU had begun to set up LITN . It consisted of six ground-based receivers spanning 20∘along Taiwan meridian (121∘E) to receiver beacon signals from the US Naval Navigation Satellite System (NNSS) with receiver JMR-1 in order to carry out the large scale experiments on two-dimensional ionospheric imaging by computerized tomography until the decommission of NNSS satellites in late 1997.Since July 2003, NCU has purchased 4 ITS30 receivers from North West Research Associates, Inc. (NWRA) and set them in Pingtung , Nantou and Taoyuan in Taiwan for the reestablishment of the NEW LITN with the hope to promote the receiving stations to other countries such as Philippines , Indonesia and so on in the near future . In this thesis, We have applied STK ,IRI-model to determine the location of LEO satellite and initial electron number density . In addition, the simulation study of GPS/MET and real data inversion with the ITS receiver were accomplished. A comparison is made between our results and dynasonde data, some possible explanation were discussed. After Formosat-3, which consist of six LEO satellites and one more frequency band (1066.67MHz), entered into their orbits, we can get more data for the inversion of CIT study.
黃耀賢. "Impact of Current Harmonic on Distribution Design in Low Voltage Distribution System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/25717421368607398202.
Повний текст джерела國立臺灣科技大學
電機工程系
89
The three phases four wires 220/380V grounded Y connected con-figuration is mostly used for low voltage distribution system in Taiwan. Meanwhile the three phases four wires 110/220 V-V connected configu-ration is widely used for commercial and residencial regions to supply single phase home appliances and other equipments. The electrical engi-neers were used to design low voltage distribution system with reducing the rating of the neutral wire based on the considerations that electric loads were distributed evenly and the unbalance condition was not very serious. Recently, a large number of power electronic control equipments were used in industrial applications, the current harmonic contents became to be the major concerns affect the power quality of the distribution sys-tems and the electric safety. It may cause electric fire hazards when the total current flowing in the neutral wire exceeds the rated ampacity of the neutral wire. The research was devoted to discuss the effects and harmfulness due to current harmonics caused by higher harmonic loads in the distribution system. The various connections model of the dis-tribution transformer and Y/ connected configurations of the loads were proposed firstly, then we simulate and analyze the effects caused by current harmonics by Pspice, a commercial simulation software, in order to evaluate the distribution safety quantitively. Finally, many strategies were proposed to solve the current harmonics problems caused by lighting luminaries as an example to discuss the effectiveness of the strategies proposed.
Anand, Raj R. "Kalman Filter Estimation Of Ionospheric TEC And Differential Instrumental Biases Over Low Latitude Using Dual Frequency GPS Observations." Thesis, 2006. http://hdl.handle.net/2005/426.
Повний текст джерелаLiu, Jia-En, and 劉佳恩. "Development of Position Control System for Three-phase Permanent-magnet Synchronous Motors with Low Current Harmonics." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/auw7md.
Повний текст джерела國立臺灣科技大學
電機工程系
104
The thesis focuses on the development of position control system for three-phase permanent-magnet synchronous motor (PMSM) with reduced current harmonics strategy. A three-leg three-phase inverter is adopted as the driving circuit of three-phase PMSM. Voltage space vector pulse-width modulation method is used for increasing the utility ratio of dc-link voltage. As for the feedback of the rotor positions and rotational speed, the resolver and resolver to digital converter, which not only detect the absolute position of the rotor, but also improve the resolution of feedback signals are used. Whereas, for the current harmonics mitigation control, fast fourier transform is introduced for analyzing the harmonic distortion of back electro-motive-force (EMF). Through transferring harmonic components of back EMF to quadrature- and direct-axis, and compensating them with current controllers, the harmonic distortion of current can be improved. In addition, position controller of adjustable proportional gain which can reduce the steady-state error of position in the same response time is proposed. In the steady state, the direct-axis current is used for locking rotor. This can stop the response of position from being affected by noise of feedback elements to cause rotor vibration. Additionally, An anti-interference control strategy is proposed to yield electromagnetic torque instantaneously to resist disturbing forces exerted on the rotor, resulting in no position overshoot in the steady state, thereby enhancing the interference immunity of the system. The 32-bit digital signal processor, TMS320F28069, is adopted as the control core. The control strategy is completed by software program for cost reduction and reliability enhancement. The experimental results of current harmonics mitigation control show that the total harmonic distortion of three phase current is reduced from 5.30% to 2.31%, The corresponding torque ripple is reduced from 15.28% to 5.98%. Whereas, the experimental results of position closed-loop control system indicate that properly adjusting the proportional gain of position controller reduces the steady-state error of position from to . In conclusion, the feasibility of the proposed control strategy has been verified by the experimental results.
Chang, Wan-Siang, and 張萬祥. "Analysis of the Ground Current Characteristics of Low Voltage Distribution System in the Large High-Tech Plants." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/95049630923487737844.
Повний текст джерела中原大學
電機工程研究所
92
Abstract In the large high-tech plants, the distribution system has many cables, wires and apparatus being allocated everywhere. Some currents from the system will flow into ground to form the so-called ground currents which flow through everywhere of grounding system in the plant to interfere the sensitive equipments and systems and even producing hazards. It is necessary to understand the characteristics of ground current for preventing the hazards and interference. For this, the thesis investigate the characteristics of ground currents which include the distributions of ground current, the ground potential rise and conductor current distributed on the grounding system (ground-grid) , and the magnetic fields, step voltage and touch voltage distributed on the ground surface. The affections of these characteristics on personnel and sensitive equipments and systems are also evaluated briefly. The distribution systems in the large high-tech plants usually include very high voltage (VHV), high voltage and low voltage distribution systems in which the low voltage distribution system is the subject of the study due to with large ground current and close relations with the sensitive equipments. The root causes of ground current and its affections are first described. Then, the circuit model to represent the typical three-phase five-wire (3 5W) distribution system is constructed for analyzing the ground current distribution. All the ground points, self and mutual impedances of three-phase cables, neutral wires, equipment grounding wires and the cable tray are considered in the circuit model. Various conditions including single-point and multi-point grounding of neutral lines, the different grounding impedances of cable tray, the use of equipment grounding wires and the load unbalances are taken into account in the analysis of ground current distribution. According to the ground current data from the circuit model, the other characteristics of ground current mentioned above are analyzed by a software called “CDEGS” which is based on the electromagnetic field analysis of grounding system. Finally, the affections of ground current characteristics are evaluated briefly by comparing between the data obtained from simulation and the tolerance values. The study results show that the ground currents due to low voltage distribution at normal operation will not damage the personnel but may interfere the sensitive equipments and systems. Especially, very high levels of ground currents, ground potential rises and magnetic fields due to neutral line with multi-point grounding and unbalanced loading should be prevented for protecting the sensitive equipments and systems from interferences. It is also necessary to refer the conductor currents of ground-grid and the ground current at each ground point for determining the grounding points and locations of sensitive equipments and systems. Keywords:Large high-tech plants, low voltage distribution systems, ground current, ground potential rise, magnetic field
Huang, Shi-Yuan, and 黃世源. "Design and Implementation of FSK Demodulation System Application for RFID and Current Feedback Low-Dropout Voltage Regulator." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/fzp2dm.
Повний текст джерела國立臺北科技大學
電腦與通訊研究所
96
The major research of this thesis can be divided into two parts. The first part of the thesis is to implement a FSK demodulation system for RFID. We proposed an analog demodulation system and a digital demodulation system. The both systems use the same AC-DC converter which provides DC power for demodulation circuit. The analog demodulation circuit is composed of a multiplexer, a phase frequency detector, a charge pump, and a current controlled oscillator. The digital demodulation circuit is composed of a multiplexer, a phase frequency detector, a charge pump, and a shift register. The two demodulation systems are implemented by 3.3V TSMC 0.35μm CMOS 2P4M process. The chip area of analog demodulation system is 0.34mm2 without PAD, and the chip area of digital demodulation system is 0.36mm2 without PAD. In the second part of this thesis, we presented a current feedback low-dropout voltage regulator. We adopted a simple circuit architecture and replaced voltage feedback by current feedback. Therefore, the characteristics of the proposed LDO are low quiescent current and fast transient response. The LDO is implemented by 3.3V TSMC 0.35μm CMOS 2P4M process. The chip area of LDO is 0.25mm2 without PAD.
Ting, Chen-ya, and 丁振亞. "Protective Coordination Tests and Benefit Assessment for the Current-limiting Circuit Breaker in the Low Voltage Distribution System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/bz8aj6.
Повний текст джерела國立臺北科技大學
電機工程系所
102
The objective of this thesis is to study the protective coordination between upstream and downstream circuit-breakers during short-circuit fault and influence of voltage sags on various sensitive equipments in the low-voltage distribution system in the high-tech plants. Noncurrent-limiting and current-limiting circuit breakers mixed as an upstream or downstream, and two combination in series connection are tested in the laboratory. The test is to verify the fast trip characteristics of current-limiting circuit breakers that can not only interrupt the currents within the first half cycle with prospective limited currents but also ensure the total selectivity between upstream and downstream current-limiting circuit breakers. In addition, the voltage sag magnitude and duration can be obtained from the test to certify that the use of current-limiting circuit breakers can meet the requirement of SEMI F47. All of these tests are very important to certify that the current-limiting circuit breakers with total selectivity is a useful solution for designers to plan protective coordination for the low voltage distribution system of high-tech plants.
Chen, Jia-Ming, and 陳家銘. "Development of sensorless inverter-fed compressor drive system using a DC-link current sensor with torque compensation at low speed operation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/91562963814538295895.
Повний текст джерела國立中央大學
電機工程學系
101
The objective of this thesis is to develop a sensorless permanent magnet synchronous motor (PMSM) drive for inverter-fed compressor drive system. First, a saliency back-EMF based speed estimation method combining with space vector pulse width modulation (SVPWM) is developed for sensorless control in order to achieve sinusoidal driven PMSM drive system. Then, to achieve cost savings, three-phase current signals are reconstructed by using only one DC-link current sensor. Three-phase current signals are reconstructed using the relationship between DC-link current and the inverter power components conduction states. Moreover, a load torque feedforward compensation method is implemented to improve the dynamic performance using traditional proportional-integral speed controller under external load disturbances. Furthermore, a Microchip DSP is adopted to develop the proposed inverter-fed drive system. Finally, some experimental results are given to verify the feasibility of the proposed sensorless control scheme.
Xiang, Alice. "Current state of the American healthcare system - why exorbitant spending results in low international health rankings and how to ameliorate this paradox." Thesis, 2015. https://hdl.handle.net/2144/16292.
Повний текст джерелаTsai, Yu-Ching, and 蔡宇清. "Low-Power QVCO using Current-Reused Technique and Back-Gate Coupling, Wideband QVCO with frequency divider and Integer-N Frequency Synthesizer for MB-OFDM UWB system." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/67239966097555766306.
Повний текст джерела