Готові списки джерел за темами / Rectification factors

Добірка наукової літератури з теми "Rectification factors"

Автор: Grafiati
Опубліковано: 13 липня 2022

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Статті в журналах з теми "Rectification factors":

1

Kasali, Suraju Olawale, Jose Ordonez-Miranda, Kamal Alaili, and Karl Joulain. "Spherical and cylindrical conductive thermal diodes based on two phase-change materials." Zeitschrift für Naturforschung A 77, no. 2 (October 22, 2021): 181–90. http://dx.doi.org/10.1515/zna-2021-0170.

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Abstract We theoretically studied and optimized the thermal rectification of spherical and cylindrical conductive thermal diodes operating with two phase-change materials (PCMs), whose thermal conductivities significantly changes in a narrow interval of temperatures. This is done by deriving simple analytical expressions for the heat flows, temperature profiles and rectification factors of both diodes. It is shown that diode geometry has a significant impact on the heat flows and temperature profiles, but not so much on the thermal diode rectification factor. Optimal rectification factors of 63.5 and 63.2% are obtained for the spherical and cylindrical thermal diodes operating between the terminals of VO2 and polyethylene with a temperature difference of 150 K spanning the metal–insulator transition of both PCMs. These similar rectification factors could be enhanced even more with a phase-change material exhibiting higher contrast thermal conductivity than the ones in the present study. The obtained results can thus be useful to guide the development of PCMs capable of optimizing the rectification of conductive heat flows with different geometries.
2

Petronić, Sanja, Katarina Čolić, Arko Jarić, Nebojša Ćurčić, Zijah Burzić, and Svetozar Sofijanić. "Safety factors in wall thickness calculation of rectification columns." Scientific Technical Review 71, no. 1 (2021): 3–7. http://dx.doi.org/10.5937/str2101003p.

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Gas rectification columns are a very important part of each onshore plant. Their sudden failures cause huge losses on a daily basis, while fluid leakage can be very dangerous to people and environment. For that reason, the proper design of the column is of huge importance, among the others safety factors as well. In this paper, the wall thickness measure is presented with the aim to calculate corrosion rate and remaining life of rectification columns. The minimum required column wall thickness was calculated according to the most commonly used international standard and the obtained difference was analyzed.
3

Polyanskiy, A. V., V. N. Blinichev, and O. V. Chagin. "CRITERIA OF EFFICIENCY ESTIMATION OF RECTIFICATION COLUMNS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 59, no. 1 (June 7, 2018): 3. http://dx.doi.org/10.6060/tcct.20165901.5234.

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This article deals with the efficiency of rectification columns which is often measured by the value of tray efficiency or single height of packing. The analysis of the factors influencing the efficiency of the rectification process was provided. This article shows that the commonly used Murphree efficiency factor in most cases estimates the efficiency trays and packing of the rectification process with a large error.
4

Lopatin, A. N., and C. G. Nichols. "[K+] dependence of polyamine-induced rectification in inward rectifier potassium channels (IRK1, Kir2.1)." Journal of General Physiology 108, no. 2 (August 1, 1996): 105–13. http://dx.doi.org/10.1085/jgp.108.2.105.

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The effects of permeant (K+) ions on polyamine (PA)-induced rectification of cloned strong inwardly rectifying channels (IRK1, Kir2.1) expressed in Xenopus oocytes were examined using patch-clamp techniques. The kinetics of PA-induced rectification depend strongly on external, but not internal, K+ concentration. Increasing external [K+] speeds up "activation" kinetics and shifts rectification to more positive membrane potentials. The shift of rectification is directly proportional to the shift in the K+ reversal potential (EK) with slope factors +0.62, +0.81, and +0.91 for 1 mM putrescine (Put), 100 microM spermidine and 20 microM spermine (Spm), respectively. The time constant of current activation, resulting from unblock of Spm, also shifts directly in proportion to EK with slope factor +1.1. Increasing internal [K+] slows down activation kinetics and has a much weaker relieving effect on block by PA: Spm-induced rectification and time constant of activation (Spm unblock) shift directly in proportion to the corresponding change in EK with slope factors -0.15 and +0.31, respectively, for 20 microM Spm. The speed up of activation kinetics caused by increase of external [K+] cannot be reversed by equal increase of internal [K+]. The data are consistent with the hypothesis that the conduction pathway of strong inward rectifiers is a long and narrow pore with multiple binding sites for PA and K+.
5

Toh, Chuen Ling, and Chee Wei Tan. "DC traction power substation using eighteen-pulse rectifier transformer system." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 4 (December 1, 2021): 2284. http://dx.doi.org/10.11591/ijpeds.v12.i4.pp2284-2294.

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<span lang="EN-US">Twelve-pulse rectification system had been widely integrated in today’s DC traction power sub-station (DC-TPSS). This configuration had successfully mitigated low order harmonic distortion. As some research findings had confirmed that the dc voltage and current ripple factors may further minimize by increasing the number of rectification pulses to 18, 24, or 36. This paper had presented a simulation study to investigate the prospect of implementing an eighteen-pulse rectification system in a DC-TPSS. The theory of phase-shifting transformer used to produce an 18-pulse rectifier is presented with simulation verification. Simulation result shows that 3.69% of grid current distortion index is recorded without installing any filters. In addition, the dc voltage and current ripple may also be further reduced for about 30% compared to a conventional twelve-pulse rectification system.</span>
6

Ng, Ryan C., Alejandro Castro-Alvarez, Clivia M. Sotomayor-Torres, and Emigdio Chávez-Ángel. "Thermal Rectification and Thermal Logic Gates in Graded Alloy Semiconductors." Energies 15, no. 13 (June 26, 2022): 4685. http://dx.doi.org/10.3390/en15134685.

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Classical thermal rectification arises from the contact between two dissimilar bulk materials, each with a thermal conductivity (k) with a different temperature dependence. Here, we study thermal rectification in a Si(1−x)Gex alloy with a spatial dependence on the atomic composition. Rectification factors (R = kmax/kmin) of up to 3.41 were found. We also demonstrate the suitability of such an alloy for logic gates using a thermal AND gate as an example by controlling the thermal conductivity profile via the alloy composition. This system is readily extendable to other alloys, since it only depends on the effective thermal conductivity. These thermal devices are inherently advantageous alternatives to their electric counterparts, as they may be able to take advantage of otherwise undesired waste heat in the surroundings. Furthermore, the demonstration of logic operations is a step towards thermal computation.
7

Chen, Qi Hui, and Yang Ping. "Rectification Treatment of Digging and Watering along Horizontal Direction for Resident Building." Applied Mechanics and Materials 90-93 (September 2011): 490–96. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.490.

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According to character of resident building and engineering geological condition, method of digging and watering along horizontal direction is put forward, and used for building’s rectification. Namely soil of horizontal hole is digged under one-floor ground and watered in superior subsidence side. Then subsidence is come into existence, and subsidence speed is controlled, the inclined building is forced to reverse step by step. Combining engineering examples, influence factors of building’s rectification are analyzed by numerical simulation method, which includes hole spacing, hole diameter and hole depth, and influence law of relative settlement is obtained.
8

Stenhammar, Joakim, Raphael Wittkowski, Davide Marenduzzo, and Michael E. Cates. "Light-induced self-assembly of active rectification devices." Science Advances 2, no. 4 (April 2016): e1501850. http://dx.doi.org/10.1126/sciadv.1501850.

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Self-propelled colloidal objects, such as motile bacteria or synthetic microswimmers, have microscopically irreversible individual dynamics—a feature they share with all living systems. The incoherent behavior of individual swimmers can be harnessed (or “rectified”) by microfluidic devices that create systematic motions that are impossible in equilibrium. We present a computational proof-of-concept study showing that such active rectification devices could be created directly from an unstructured “primordial soup” of light-controlled motile particles, solely by using spatially modulated illumination to control their local propulsion speed. Alongside both microscopic irreversibility and speed modulation, our mechanism requires spatial symmetry breaking, such as a chevron light pattern, and strong interactions between particles, such as volume exclusion, which cause a collisional slowdown at high density. Together, we show how these four factors create a novel, many-body rectification mechanism. Our work suggests that standard spatial light modulator technology might allow the programmable, light-induced self-assembly of active rectification devices from an unstructured particle bath.
9

Armstrong, Nicholas, Rainer C. Hoft, Andrew McDonagh, Michael B. Cortie, and Michael J. Ford. "Exploring the Performance of Molecular Rectifiers: Limitations and Factors Affecting Molecular Rectification." Nano Letters 7, no. 10 (October 2007): 3018–22. http://dx.doi.org/10.1021/nl0714435.

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10

Ting, Ping-Huang, Jiun-Ren Hwang, Chin-Ping Fung, Ji-Liang Doong, and Ming-Chang Jeng. "Rectification of legibility distance in a driving simulator." Applied Ergonomics 39, no. 3 (May 2008): 379–84. http://dx.doi.org/10.1016/j.apergo.2007.08.002.

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Статті в журналах

Дисертації з теми "Rectification factors":

1

Chivite-Zabalza, F. Javier. "High power factor rectification for aerospace systems." Thesis, University of Manchester, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.682785.

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The amount of electrically powered equipment in aircraft has increased in recent years in the move towards the More Electric Aircraft (MEA), which is expected to offer superior characteristics. To meet the stringent power quality specifications imposed by the air-frame manufacturers over the wide range of supply frequencies, many manufacturers are adopting 18-pulse Auto-Transfomer Rectifier Units (ATRU) for the ac-dc front end converter in actuators and motor drives. However, 18-pulse ATRUs often fail to meet the performance, size and weight expectations. A literature survey on converters with low effects on the supply is presented, focusing on multi-pulse rectifiers and on harmonic injection or pulse multiplication techniques. Subsequently, two novel, low VA rating, passive harmonic injection circuits, referred to as current injection and voltage injection, are analysed, simulated and experimentally evaluated. They achieve 24-pulse performance when added to a 12-pulse converter based on a 0.5 p.u. series-connected open-star/delta transformer arrangement. The Total Harmonic Distortion (THO) of the line currents was 2.6% at 400 Hz when 0.1 p.u.line inductors were used. These two injection circuits can be combined together to obtain a passive 36-pulse converter, or can be combined with a low VA-rated, bi-directional switch that operates at six times the supply frequency in two different ways, to obtain 36 and 48-pulse characteristics. Analysis and simulation results are presented, and experimental results for the two 36-pulse converters are shown. The THD of the line currents at 400 Hz, using 0.1 p.u.line inductors was 1.5% and 1.2 % respectively. Finally, a harmonic injection technique is presented that achieves 24-pulse performance when added to a parallel-connected, 12-pulse, voltage-sourced converter. This technique, which can be implemented by passive or active means, was analysed and simulated. Experimental results on a boost-type, 24-pulse converter, with a 0.5 p.u. star/delta transformer connection are presented, where the THD of the line currents remained below 3.5% at 400 Hz with 0.12 p.u. line inductors. The technique is also valid for converters using Line Interphase Transformers (LIT).
2

Kasali, Suraju Olawale. "Thermal diodes based on phase-change materials." Thesis, Poitiers, 2021. http://www.theses.fr/2021POIT2254.

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Nous étudions dans cette thèse la rectification thermique de diodes thermiques radiatives ou conductive constituées de matériaux à changement de phase.Cette thèse est divisée en trois parties. Dans les premières parties, nous modélisons comparativement les performances d’une diode thermique conductive sphérique et cylindrique constitués de VO2 présentant un transition de phase et des matériaux n’en présentant pas. Des expressions analytiques aux bornes des diodes sont dérivées. Des flux thermiques, des facteurs de rectifications ainsi que les profils de température à l’intérieur de la diode sont obtenus. Nos résul-tats montrent que les différentes géométries de diodes ont un impact significatif sur les profils de température et les flux thermiques, mais moins un sur les facteurs de rectification. Dans ce travail, nous avons obtenu des facteurs de rectification maximaux allant jusqu’à 20.8% et 20.7%, qui sont supérieurs à celui prédit pour une diode plane constituée de VO2. Nous montrons également que des facteurs de rectification similaires à ceux obtenus avec le VO2 dans les géométries sphériques et cylindriques peuvent être atteints avec des matériaux à changement de phase dont le contraste de conductivité est plus important que dans le cas du VO2. Dans la deuxième partie, nous étudions la rectification de diodes thermiques constituées de deux matériaux à changement de phase. Avec, l’idée de générer un facteur de redressement plus élevé que dans le cas d’une diode thermique conductive ne comprenant qu’un matériau à changement de phase unique. Là encore, le travail a conduit à l’établissement d’expressions explicites pour les profils de température, les flux thermiques et le facteur de rectification. Nous avons obtenu un facteur de rectification optimal de 60% avec une variation de température de 250 K couvrant les transitions métal-isolant des deux matériaux. Dans la troisième partie de notre travail, nous avons modélisé et optimisé la rectification thermique de diodes thermiques planes, cylindriques et sphériques radiatives à base de deux matériaux à changement de phase. Nous savons calculer et analyser les facteurs de rectification de ces trois diodes et obtenu les facteurs de rectification optimaux respectifs pour les trois géométries 82%, 86% et 90.5%. Nos résultats montrent que la géométrie sphérique est la meilleure pour optimiser la rectification des courants thermiques radiatifs. De plus, des facteurs de rectification potentiellement supérieurs à ceux prédits ici peuvent être réalisés en utilisant deux matériaux à changement de phase avec des contrastes d’émissivités plus élevés que ceux proposés ici. Ces résultats analytiques et graphiques fournissent un guide utile pour optimiser les facteurs de rectification des diodes thermiques conductives et radiatifs basées sur des matériaux à changement de phase de géométries différentes
The thermal rectification of conductive and radiative thermal diodes based on phase-change materials, whose thermal conductivities and effective emissivities significant change within a narrow range of temperatures, is theoretically studied and optimized in different geometries. This thesis is divided into three parts. In the first part, we comparatively model the performance of a spherical and cylindrical conductive thermal diodes operating with vanadium dioxide (VO2) and non-phase-change materials, and derive analytical expressions for the heat flows, temperature profiles and optimal rectification factors for both diodes. Our results show that different diode geometries have a significant impact on the temperature profiles and heat flows, but less one on the rectification factors. We obtain maximum rectification factors of up to 20.8% and 20.7%, which are higher than the one predicted for a plane diode based on VO2. In addition, it is shown that higher rectification factors could be generated by using materials whose thermal conductivity contrast is higher than that of VO2. In the second part, on the other hand, we theoretically study the thermal rectification of a conductive thermal diode based on the combined effect of two phase-change materials. Herein, the idea is to generate rectification factors higher than that of a conductive thermal diode operating with a single phase-change material. This is achieved by deriving explicit expressions for the temperature profiles, heat fluxes and rectification factor. We obtain an optimal rectification factor of 60% with a temperature variation of 250 K spanning the metal-insulator transitions of VO2 and polyethylene. This enhancement of the rectification factor leads us to the third part of our work, where we model and optimize the thermal rectification of a plane, cylindrical and spherical radiative thermal diodes based on the utilization of two phase-change materials. We analyze the rectification factors of these three diodes and obtain the following optimal rectification factors of 82%, 86% and 90.5%, respectively. The spherical geometry is thus the best shape to optimize the rectification of radiative heat currents. In addition, potential rectification factors greater than the one predicted here can be realized by utilizing two phase-change materials with higher emissivities contrasts than the one proposed here. Our analytical and graphical results provide a useful guide for optimizing the rectification factors of conductive and radiative thermal diodes based on phase-change materials with different geometries
3

Lin, Cheng-Ting, and 林政廷. "Study and Implementation of a Bridgeless AC-Switch Power Factor Corrector with Voltage Doubler Rectification." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/78551253167336486367.

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Анотація:
碩士
國立臺灣科技大學
電子工程系
101
This thesis presents a novel bridgeless power factor corrector (PFC) topology. The purpose is to discuss whether we can improve the conversion efficiency by reducing the semiconductor components under existing control method and power device characteristics. The presented novel bridgeless PFC combines a bridgeless power factor corrector with a voltage doubler rectifier. Compared with the conventional bridge rectifier, this solution can improve the conversion efficiency at full load by removing two power diodes. The efficiency can reach 95% for the input voltage 115 Vac and 230 Vac, and even 98% at 230 Vac. A 750-W bridgeless AC-Switch PFC with voltage doubler rectification and 750-V output voltage is implemented. Also a 750-W bridgeless AC-Switch PFC with an output voltage of 380 V is built for comparison. Simulations and experimental results verify the correctness and feasibility of the control method and the loss analysis.
4

Li, Chih-Wei, and 李智緯. "Design and Implementation of a Dual-Switch Forward Converter with Power-Factor-Correction and Synchronous Rectification." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/80020283266386973624.

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Анотація:
碩士
義守大學
電機工程學系碩士班
95
A dual-switch forward converter with power-factor-correction and synchronous rectification is proposed in this dissertation. The dual-switch forward converter has the characteristic of lower voltage stress of switches than that of the traditional forward converter. So, it is suitable for high input voltage application. Furthermore, to further increase the efficiency of the converter, the synchronous rectification has been studied and applied in this proposed converter. To obtain a high power factor, a boost topology operated at constant frequency with average current control mode is built in the proposed circuit. Before verification with experiments, IsSpice is used to simulate the operation of dual-switch forward converter. As a result, a 12V/25A output prototype is built, the measured efficiency of PFC stage is up to 97.2% under AC 265V input, and the overall efficiency is 88.7%.
5

Chiang, Wen-Yuh, and 蔣文裕. "Design and Implementation of a Low Standby Power Supply with Power Factor Correction and Synchronous Rectification." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/8d3xxv.

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Анотація:
碩士
國立臺北科技大學
電機工程系所
101
The purpose of the thesis is to develop a power supply with high efficiency and low stand-by power consumption. The power supply is constructed with an electromagnetic interference (EMI) filter which can efficiently reduce EMI issues caused by the system. The pre-stage adopts a boost Power Factor Corrector to increase the power factor and decrease the current harmonic, thus improves the power quality and harmonic issue. The post-stage adopts a flyback converter circuit and operates with a synchronous rectification technique. As a result, the power consumption on the secondary circuit has been significantly reduced and the efficiency of power supply can be raised. When the output loading is tiny, the pulse-width modulation control circuit can close power factor corrector circuit and diminish the loss of power factor stage. In addition, by closing the pulse width modulation stage on the stand-by mode control circuit will greatly decrease the stand-by power consumption under no-load condition. In conclusion, the thesis implements a high efficient power supply with low stand-by power consumption of which specifications include input voltage range of 90~264 Vac and output of 19 Vdc / 90 W. The practice power supply is implemented to test and verify the compliance with the of EPA requirements and Energy Star regulations.
6

HSU, HONG-YUAN, and 許鴻源. "Study and Implementation of LLC Series-Resonant Half-Bridge Converter with Power Factor Correction and Synchronous-Rectification." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/5sjq64.

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Анотація:
碩士
國立高雄應用科技大學
電機工程系博碩士班
104
This thesis focuses on the study and implementation of LLC resonant half-bridge converter with power factor correction and synchronous-rectification. The system architecture also includes inrush current limit circuit, surge protect circuit and EMI filter. The front-end stage uses active boost power factor corrector with average current control to eliminate the current harmonics and raise the input power factor. The second stage uses LLC series-resonant half-bridge circuit so that the switching element can reach zero-voltage switching to reduce switching losses. The output terminal uses synchronous rectification further reduce conduction losses and achieving high efficiency. This thesis describes the basic principles and analyzes the operation PFC and LLC characteristics, discusses the key elements selection of the circuit and the magnetic component design method, and gives a detailed instruction for the LLC integrated transformer winding methods. Finally, using circuit simulation software PSPICE to simulate LLC in open-loop manner. The choice of resonant element could be guaranteed to have ZVS characteristics by PSPICE. The study implements a 200W of AC-DC power supply, and the input voltage range is 90 ~ 264Vac, output voltage is 24Vdc, and he full load current is 8.3A. When input is 110Vac and output is full load, the efficiency is 90.88%. At 220Vac input and full load of output, the efficiency is 93.44%. The experimental results meet theoretical design.
7

Chou, Yin-hsuan, and 周寅瑄. "Analysis and Design of a Current-Sensorless Synchronous Rectification Power Factor Correction SEPIC Converter Applying to Brushless DC Motors." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/40113108826944328553.

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Анотація:
碩士
國立雲林科技大學
電機工程系碩士班
101
This thesis presented a current-sensorless synchronous rectification PFC SEPIC converter applying to the brushless DC motors. To simplify control and improve efficiency, a PFC SEPIC converter with no current sensor but with synchronous rectification is proposed. Through the relationship of the input voltage and output voltage, the duty ratio of the synchronous rectifier switch can be calculated without any current sensing elements and cost can be reduced. In order to avoid the conduction time overlap of the main switch and the synchronous rectifier switch, the charging time causing by the parasitic capacitor of the switch has to be estimated. After calculation, a register of digital-control-chip was set and the signal is outputted correctly at the right timing. In general, the analog control chip used dual-slope integrator including RC elements to estimate the rise time and fall time to implement a current-sensorless synchronous rectification SEPIC converter. However, the analog control circuit applied to the power factor correction topology might not be able to respond correctly with the default RC elements. Digital control chip could solve this response problem. There are two advantages which were saving the analog-control-chip and simplifying the topology of the control circuit when the control of the front stage converter and control of the end stage BLDC motor were combined in the same digital-control-chip. Two modulation control methods "PWM" (Pulse Width Modulation) and "PAM" (Pulse Amplitude Modulation) were used in the motor control. When the speed was between 5500 and 10000 rpm, the digital-control-chip would set automatically into "constant voltage mode", which applying PWM method and VO is kept at 165V. On the other side, when the speed was between 2500 and 5500 rpm, the digital-control-chip would set automatically into "constant duty mode", which applying PAM method and VO is kept between 70 and 165V. The interface of control was DSP TMS32028335 of Texas Instruments.
8

Li, Shi-Chang, and 李錫昌. "Study and Implementation for 200W LED Streetlight Drive Circuits Based on LLC Resonant Converter with Power Factor Correction and Synchronous Rectification." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/69534648595010103110.

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Анотація:
碩士
建國科技大學
電機工程系暨研究所
101
Abstract Traditional metal streetlights are too energy-consuming and require to work in the conditions of high temperature, therefore the service life is short and does not match the energy-saving trend of the times, they have been gradually replaced by white LED lights. According to the current white LED luminous efficacy(cool white: 254 lm/W, warm white: 216 lm/W), much larger than the metal lamps 60 lm/W luminous efficiency, white LED lights can save about 1/3 to 1/2 of energy. To achieve the energy-saving purpose, it is also required to take into account the efficiency and power factor problems when installed LED streetlights. According to the CNS LED Streetlight Standard CNS15233, which specifies the input power factor and overall conversion efficiency must be greater than 90%, this thesis proposes a new design of 200W high-performance LED streetlight drive circuits. It is composed of four parts of circuits: (1) power factor correction, (2) LLC resonant converter, (3) synchronous rectification, (4) constant current control circuit. The experimental results show that its power factor at full load under 220V input is up to 0.97, and the conversion efficiency of PFC stage is up to 97.8%; the maximum and full load conversion efficiencies of LLC resonant converter stage are as high as 96% and 95.5% respectively. The whole circuit conversion efficiency at full load is as high as 93%, power factor is also up to 0.99, either power factor or conversion efficiency is much superior to the values specified by the CNS Standards.
9

陳建成. "Study and Implementation for Smart Lead Acid Battery Chargers Based on Two-Switch Quasi-Resonant Flyback Converter with Synchronous Rectification and Power Factor Correction." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/65190468520971571668.

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Анотація:
碩士
建國科技大學
電機工程系暨研究所
100
Abstract Traditional commercially available lead-acid battery chargers, although nearly have been replaced by high-frequency switching mode, but flyback and forward converters are still the two general types. Due to the hard switching topologies, the two converters have the shortcomings of low conversion efficiency, high electromagnetic interference (EMI) and radio frequency interference (RFI). These converters are directly connected to the high voltage capacitors after bridging, the power factor of AC side is very low, a lot of reactive power flowing on the circuits. Furthermore, due to the circuit design without using single-chip, the conventional chargers as described above do not have the flexibilities of the constant current (CC) and constant voltage (CV) adjustments. To improve these shortcomings, this thesis proposes a new high-performance smart charger circuit topology which combines the techniques of power factor correction (PFC), two-switch quasi-resonant, secondary side synchronous rectification and single-chip software monitoring. It can promote the AC side power factor and maintain high conversion efficiency at the same time, and also can make CC and CV controls flexible by single-chip hardware and software program. As demonstrated by the experimental results, the charging efficiency of the proposed topology excluding PFC is up to 93.7%; but for the circuits including PFC, the power factor has been increased to above 0.98, and the charging efficiency remains 88%. It appears that the overall charging effect of the proposed method is very good.

Книги з теми "Rectification factors":

1

Watt, Gary. Equity & Trusts Law Directions. Oxford University Press, 2019. http://dx.doi.org/10.1093/he/9780198804703.001.0001.

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Without assuming prior legal knowledge, books in the Directions series introduce and guide readers through key points of law and legal debate. Questions, diagrams, and exercises help readers to engage fully with each subject and check their understanding as they progress. This book explains the key topics covered on equity and trusts courses. The content of the text is designed to emphasise the relationship between equity, trusts, property, contract, and restitution to enable students to map out conceptual connections between related legal ideas. There is also a focus on modern cases in the commercial sphere to reflect the constantly changing and socially significant role of trusts and equity. The book starts by introducing equity and trusts. It then includes a chapter on understanding trusts, and moves on to consider capacity and formality requirements, certainty requirements, and the constitution of trusts. Various types of trusts are then examined such as purpose, charitable, and variation trusts. The book then describes issues related to trusteeship. Breach of trust is explained, as is informal trusts of land. There is a chapter on tracing, and then the book concludes by looking at equitable liability of strangers to trust and equitable doctrines and remedies. This new edition includes coverage of significant recent cases, including Patel v Mirza [2016], Supreme Court on the right to recover wealth transferred between parties to an illegal scheme; Burnden Holdings (UK) Ltd v Fielding [2018] UKSC 14; [2018] 2 WLR 885, Supreme Court on limitation of actions; Barnett v Creggy [2016], Court of Appeal on breach of trust and limitation of actions; Singha v Heer [2016], Court of Appeal on facts giving rise to declaration of trust; Clydesdale Bank plc v John Workman [2016], Court of Appeal on dishonest assistance in a breach of trust; Bathurst v Bathurst [2016], on variation of trusts; Newman v Clarke [2016], on fiduciary conflict of interest; RBC Trustees (CI) Ltd v Stubbs [2017], on rectification of a trust deed on the ground of mistake; Erlam v Rahman [2016] EWHC 111 and JSC Mezhdunarodniy Promyshlenniy Bank v Pugachev [2017] EWHC 2426, on ‘sham” trusts’. It also provides coverage of the 2017 Money Laundering, Terrorist Financing and Transfer of Funds Regulations (SI 2017/692 as well as the EU Fourth Money Laundering Directive ((EU) 2015/849), as amended by the The EU Fifth Money Laundering Directive ((EU) 2018/843)

Частини книг з теми "Rectification factors":

1

Kim, Seong Gyu, Sung Woo Han, Seung Sam Seo, Jong Il Bae, and Gi Sig Byun. "A Study of the Power Factor Improvement by Using Harmonic Filter in Busan Urban Railway Substation with Thyristor Rectification Method." In Lecture Notes in Electrical Engineering, 908–14. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-69814-4_87.

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2

Ch’i, Hsi-Sheng. "Factors Impeding the Rectification Campaign." In Politics of Disillusionment, 187–225. Routledge, 2019. http://dx.doi.org/10.4324/9781315289052-8.

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3

Olarewaju, Ogundele Michael. "Ethical Data Management and Research." In Ensuring Research Integrity and the Ethical Management of Data, 209–18. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2730-5.ch012.

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This chapter focuses on the concepts of ethical issues and research integrity. Those unethical issues in research such as copyright violation, submitting articles for publication to more than one journal, and author biases are mentioned. The chapter also investigates the causes of unethical issues in research like inadequate national concept benchmark accorded publication, political influence and economic factors, the aftermath and the way forward for enhancing research integrity in Nigerian education is also recommended for rectification.
4

Davies, Paul S. "12. Interpretation." In JC Smith's The Law of Contract. Oxford University Press, 2018. http://dx.doi.org/10.1093/he/9780198807810.003.0012.

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This chapter examines approaches to contract interpretation. Interpretation is the exercise by which the meaning of the contract is ascertained. Under the so-called traditional approach to interpretation, where the contractual language chosen was clear and unambiguous, that language was simply given effect. By contrast, under the ‘modern’ approach to interpretation, a much broader range of factors can be taken into account, and courts now appear able to depart from the ‘plain meaning’ of a written document. The modern approach takes into account the ‘matrix of fact’ in which the contract is concluded, including the purpose of the contract. The modern approach has been praised for allowing judges greater flexibility in order to reach a fair result, but criticised for undermining commercial certainty, potentially prejudicing third parties, and intruding into the domain traditionally occupied by the doctrine of rectification.
5

Davies, Paul S. "12. Interpretation." In JC Smith's The Law of Contract, 166–83. Oxford University Press, 2021. http://dx.doi.org/10.1093/he/9780198853503.003.0012.

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This chapter examines approaches to contract interpretation. Interpretation is the exercise by which the meaning of the contract is ascertained. Under the so-called traditional approach to interpretation, where the contractual language chosen was clear and unambiguous, that language was simply given effect. By contrast, under the ‘modern’ approach to interpretation, a much broader range of factors can be taken into account, and courts now appear able to depart from the ‘plain meaning’ of a written document. The modern approach takes into account the ‘matrix of fact’ in which the contract is concluded, including the purpose of the contract. The modern approach has been praised for allowing judges greater flexibility in order to reach a fair result, but criticised for undermining commercial certainty, potentially prejudicing third parties, and intruding into the domain traditionally occupied by the doctrine of rectification.
6

Andreas, Joel. "Enfranchised." In Disenfranchised, 27–52. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190052607.003.0002.

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Chapter 2 recounts how the Chinese Communist Party reorganized industrial enterprises after taking power in 1949. Small numbers of party cadres, typically peasant veterans of the rural insurgency, were dispatched to factories to mobilize workers to attack capitalists and incumbent managers. Through a series of aggressive mass campaigns, the party established its control, recruiting workers to serve as factory leaders and creating party-led institutions of participation. After nationalization was completed in 1956, Mao—concerned that Communist cadres were becoming autocratic and arrogant—initiated a Party Rectification campaign, in which he encouraged unusually freewheeling criticism of “bureaucratism” among party officials. This opening unleashed a torrent of criticism by intellectuals as well as strikes by workers and inspired union leaders to push for greater independence from the party. The campaign, however, was quickly aborted and during the subsequent Anti-Rightist movement those who had spoken out were harshly punished, squelching prospects for autonomous activity.
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"Electrical Generation Transmission and Distribution 6-245 Wiring Systems and Enclosures 6-246 Wiring Enclosures 6-247 Conduit Capacities 6-248 System Earthing Arrangements 6-251 Inspection and Testing 6-253 The Inspection Process 6-254 Periodic Inspection 6-255 The Inspection Process 6-257 The Testing Process 6-258 With the supply disconnected 6-259 The electrical supply may now be connected or reconnected 6-260 Electrical Test Instruments 6-261 Instrument accuracy 6-261 Calibration 6-261 Low-Resistance Ohmmeter Specification 6-262 Factors affecting accuracy 6-262 Insulation-Resistance Ohmmeter Specification 6-262 Factors affecting accuracy 6-262 Earth Fault Loop Impedance Tester Specification 6-263 Factors affecting accuracy 6-263 RCD Tester Specification 6-263 Factors affecting accuracy 6-263 Certification and Reporting 6-264 Electrical Installation Testing 6-265 Electrical Installation Test Procedures 6-267 Selecting Electrical Test Instruments 6-270 Inspection Testing and Certifying – A Summary Worksheet 6-273 Worksheet 14 (MC Questions) 6-276 Answers to Worksheets 1 to 14 6-284 7 Unit 3 (Level 3) Installation (Buildings and Structures) Fault Diagnosis and Rectification 7-289 Safe Working Procedures Before Undertaking Fault Diagnosis 7-291 Secure Electrical Isolation and Lock Off 7-293 “Proving” Equipment 7-293 On load, Off load Switching Devices 7-293 Restoration of the Supply 7-294 Secure Isolation Procedures 7-295 Safe Working Procedures 7-296 Electrical Faults – Symptoms 7-298." In Electrical Installation Work Curriculum Support Pack, 6. Routledge, 2006. http://dx.doi.org/10.4324/9780080505145-4.

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Тези доповідей конференцій з теми "Rectification factors":

1

Meng, Qinglong, Zhuolin Su, Junli Yu, and Bin Zhang. "Effect of major factors on damage threshold of optical rectification crystals." In SPIE Optical Engineering + Applications, edited by Alson E. Hatheway. SPIE, 2015. http://dx.doi.org/10.1117/12.2187644.

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2

Sayer, Robert A. "Thermal Rectification in Bulk Materials Using Rough Contacts: A Thermal Diode." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86065.

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Thermal rectification occurs when a device permits heat to flow preferentially in one direction direction while restricting it in the opposite direction. Thermal rectification can occur whenever an asymmetry is present in a device, and has been demonstrated to arise in bulk materials that have asymmetric geometry, in the contact of two materials with different thermal properties and in nanomaterials. Herein, a thermal diode that utilizes thermal expansion to directionally control interfacial conductance between two contacting surfaces is presented. Essentially, the device consists of two thermal reservoirs contacting a beam with one rough and one smooth end. When the temperature of reservoir in contact with the smooth surface is raised, a similar temperature rise will occur in the beam, causing it to expand, thus increasing the contact pressure at the rough interface and reducing the interfacial contact resistance. However, if the temperature of the reservoir in contact with the rough interface is raised, the large contact resistance will prevent a similar temperature rise in the beam. As a result, the contact pressure will be marginally affected and the contact resistance will not change appreciably. Owing to the decreased contact resistance of the first scenario compared to the second, thermal rectification occurs. A parametric analysis is used to determine optimal device parameters including surface roughness, contact pressure and device length. Modeling predicts rectification factors greater than 2 are possible at thermal biases as small as 3 K.
3

Vallabhaneni, Ajit K., Jiuning Hu, Yong P. Chen, and Xiulin Ruan. "Thermal Rectification in Graphene and Carbon Nanotube Systems Using Molecular Dynamics Simulations." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44521.

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We investigate the thermal rectification phenomena in asymmetric graphene and carbon nanotube systems using molecular dynamics (MD) simulations. The effects of various parameters, including mean temperature, temperature difference, and system size on rectification factor have been studied. In homogenous triangular graphene nanoribbons (T-GNR), the heat current is normally higher from wide to narrow end than that in the opposite direction, resulting in a positive rectification factor. The rectification factor increases further for a double layered T-GNR. It is also found that varying the parameters like mean temperature can result in reverse of the sign of thermal rectification factor. In the case of carbon nanotube (CNT)–silicon system, the heat current is higher when heat flows from CNT to silicon. The thermal rectification factor is almost independent of the diameter of CNT. In both cases, the rectification factor increases with the imposed temperature difference.
4

Tsunori, M., C. M. Davies, D. Dye, and K. M. Nikbin. "Numerical Modelling of Residual Stress and Distortion in Welded Thin Steel Plates." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61170.

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Current trends in ship design are to reduce panel thickness in order to minimise the vessels weight and hence maximise speed. These panels are manufactured through butt welding thin steel plates with the addition of fillet welded stiffeners. Excessive distortions are exhibited in these thin plates due to the welding process, resulting in major rectification or re-manufacturing costs. The aim of this study is to develop a tool to predict welding residual stresses and distortions in order to understand their governing factors, and thus enabling the optimum fabrication processes to be realized to minimise welding distortion. Finite element simulations are performed of the butt and fillet welding process in 4 mm thick plates of ferritic DH-36 steel and the residual stresses and distortions are predicted. Thermal and residual stress profiles are verified against experimental measurements. The effects of plate and stiffener dimensions are examined numerically. In addition, a sensitivity analysis has been carried out to quantify the effects of restraint on a small butt welded plate. It is concluded that final distortion may be severely reduced, in the plate size considered, if only an out-of-plane constraint is imposed on the plate’s surfaces. Further welding experiments are required to validate these findings.
5

Ghanekar, Alok, Jun Ji, Mingdi Sun, Zongqin Zhang, and Yi Zheng. "Enhanced Thermal Rectification of Near-Field Thermal Diode Using Surface Gratings." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65369.

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We demonstrate workings of a near-field thermal rectification device that uses phase change material to achieve asymmetry in heat transfer. We exploit the temperature dependent dielectric properties of VO2 due metal-insulator transition near 341 K. The device operates near the critical temperature of the phase change material. Analogous to an electrical diode, heat transfer coefficient is very high in one direction (forward bias) while it is very small when the polarity of temperature gradient is reversed (reverse bias). Rectification as high as 15 can be obtained for minimal temperature difference of 5 K. We show that high rectification is achieved by using 1-D triangular and rectangular surface gratings. The rectification factor is dramatically enhanced in the near-field due to the spectral mismatch between dissimilar materials for the negative polarity.
6

Sakkos, T. "New unity power factor diode rectifiers using ripple-power re-rectification." In 8th International Conference on Power Electronics and Variable Speed Drives. IEE, 2000. http://dx.doi.org/10.1049/cp:20000276.

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7

Chang Li Si, Claire, Fedawin Johing, Yoon Chiang Wong, Nur Melatee Binti Mohd Fauzi, Ahmad Muzakkir Bin Mohamad, Kwang Chian Chiew, and Kit Teng Chaw. "A Case Study on Field F Multiphase Flow Meter: How is it Better than a Conventional Test Separator?" In SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205557-ms.

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Abstract Multiphase flow meters (MPFM) have been known save costs for new installations, are compact and as effective as a test separator. Field "F" is a green field with 2 wells and has been producing since 2018 from the same reservoir. The test facilities consist of an MPFM, and F flows to a hub called Field "G". Towards Q2 of 2019, there was a significant increase in production rates from both wells without any changes to surface choke size and without enhancement jobs performed. Added to that, reservoir pressure showed steady depletion. Daily production allocation for F showed lower than usual reconciliation factor when combined with G hub production. This suboptimal allocation raised doubts about the MPFM well test readings which launched a full investigation into the accuracy of the meter. From the offshore remote monitoring system, the first suspect was the increased inlet pressure causing parameters to be out of the MPFM operating envelope range. However, after further checking, there were other pressing issues such as faulty transmitter, and low range sensors. As these issues were being dealt with amidst the COVID-19 pandemic, the process to fix the meter was longer than usual. Rectification involved troubleshooting the MPFM post performing Multi Rate Tests, back allocation check to hub production and PROSPER/GAP model matching to check on the credibility of the well tests. These efforts were made due to budget cuts, as there was no advantage to bring onboard an entire well test package (separator) to test the F wells. Post several rectifications, the liquid, gas and oil rates were within 10% difference from allocation meter back allocation and PROSPER model calculation. Reconciliation factor for field G has also increased to normal range of 0.92 to 0.95. However, the rectification also showed a significant drop in metered rates, proving that the MPFM was indeed generating incorrect well tests since Q2 2019. The drop was higher than 30% in gross production rates which lead to a better understanding of the reservoir, and corrections to be made to dynamic models for any future development projects. This hence proves that even with the similar reservoir properties in both wells, the MPFM well tests still require vigorous checking and should not be treated in the same way as a test separator. This paper will describe the efforts by surface and subsurface faculties to ensure the quality of well tests from the MPFM. For future projects considering the MPFM installation, best to frequently quality check the MPFM well test figures with a test separator. However, if that option is not feasible, the efforts in this paper can act as a guide for the field.
8

Tieck, R. M., G. P. Carman, and D. G. Enoch Lee. "Electrical Energy Harvesting Using a Mechanical Rectification Approach." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15712.

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This paper presents a new approach using frequency rectification to harvest electrical energy from mechanical energy using piezoelectric devices. The rectification approach utilizes a linearly traveling Rectifier to impart vibrational motion to a cantilever piezoelectric bimorph. A conventional cantilever-type energy harvester is tested aside the rectified beam. The Standard beam generated 0.11 W of power, a power density of 15.63 kW/m3, and an energy density of 130.7 J/m3. The Rectified beam generated 580 mW of power, a power density of 871.92 kW/m3, and an energy density of 313.15 J/m3, a factor 2.4 greater than conventional energy harvesting methods. These results confirm the original thesis that a mechanically rectified piezoelectric Energy Harvester would generate larger Energy and Power Densities as well as Specific Powers, compared to conventional technologies.
9

Al-Zubaidi, Saif, Mohammed Zaki Ahmed, and Paul Davey. "High power factor single phase rectification technique with reduced line current harmonics." In 2014 IEEE 15th Workshop on Control and Modeling for Power Electronics (COMPEL). IEEE, 2014. http://dx.doi.org/10.1109/compel.2014.6877208.

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10

Barbi, I., and S. A. Oliveira da Silva. "Sinusoidal line current rectification at unity power factor with boost quasi-resonant converters." In Applied Power Electronics Conference and Exposition. IEEE, 1990. http://dx.doi.org/10.1109/apec.1990.66454.

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