Relevant bibliographies by topics / THD ANALYSIS

Academic literature on the topic 'THD ANALYSIS'

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Published: 11 September 2023

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Journal articles on the topic "THD ANALYSIS"

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Huang, Bin, Le-qin Wang, and Jia Guo. "Performance comparison of circular, two-lobe and elliptical journal bearings based on TEHD analysis." Industrial Lubrication and Tribology 66, no. 2 (March 4, 2014): 184–93. http://dx.doi.org/10.1108/ilt-11-2011-0086.

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Purpose – The purpose of this paper is to study the different performance of circular, two-lobe and elliptical journal bearings by TEHD analysis. Design/methodology/approach – A complete 3D TEHD model of journal bearings is set up and applied to the lubricant performance calculation of the conventional circular, two-lobe and elliptical journal bearings. The finite difference method is employed to solve the THD model, and the thermo-elasto deformations on the pad are obtained by the finite element software ANSYS11.0. The data transfer between the THD model and ANSYS11.0 is carried out automatically by Interface Program. Findings – It is found that under the identical geometric parameters and operating condition, the circular journal bearing possesses the greatest magnitude of the maximum oil film pressure, the two-lobe one takes the second place and the elliptical one possesses the smallest magnitude. The thermo-elasto deformations on the pad is the same order of magnitude with the minimum film thickness. Practical implications – A complete 3D TEHD model made up of the THD model and ANSYS11.0 can be applied on journal bearings in practice applications. Originality/value – This paper set up a complete 3D TEHD model that is in common use for the lubricant performance analysis of circular and non-circular journal bearings.
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Anang, Nurhazwani, and Wan Mariam Wan Muda. "Analysis of total harmonic distortion in single-phase single-stage grid-connected photovoltaic system." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 1 (March 1, 2023): 471. http://dx.doi.org/10.11591/ijpeds.v14.i1.pp471-479.

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<p>This study presents the power quality issue mainly focus the effect of total harmonic distortion (THD) on a grid-connected PV system. Firstly, a grid-connected PV system with a single-phase single-stage has been developed to monitor the output values of voltage and current and also its harmonic distortion behaviours. Maximum power point tracking (MPPT) was implemented since it is proven as the first step for THD reduction because MPPT will extract maximum output power, voltage, and current of the PV system without fluctuation which leads to a low THD level. Furthermore, the employment of a good filter also reduces the THD level in a PV system. Thus, this study will focus on the THD analysis to resolve the power quality problems in the grid-connected PV system. The result shows that the THD value for current, <em>I<sub>THD</sub></em> analysis is more significant than the THD value for voltage, <em>V<sub>THD</sub></em> analysis in the case of grid-connected PV systems operating under different solar irradiances. In a conclusion, the increase in solar irradiance will increase the rated values of generated power and current thus, increasing the performance of THD values.</p>
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Muzakki, Rizdam Firly, and Chairul Gagarin Irianto. "Voltage THD Analysis on the Use of DC Motors in Steel Milling Process." Jurnal Edukasi Elektro 7, no. 1 (May 30, 2023): 1–11. http://dx.doi.org/10.21831/jee.v7i1.59289.

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A milling process utilize DC motors and rectifier circuits. Semiconductor components in the rectifier circuit could cause harmonic distortion. At PT X, the voltage THD generated at the 6KV feeder panel has exceeded the standards set by the IEEE. This study aims to analyze the voltage THD caused by a controlled rectifier circuit and DC motors, and to design a filter to mitigate it. MATLAB software is used to analyze the THD voltage. From the simulation results, it is known that the 400KW, 450KW, and 600KW DC motors produce voltage THD values of 9.35%, 14.23%, and 12.28% respectively which exceed the set standards of 8%. A single-tuned passive filter is designed to reduce the THD voltage value on each motor. The installation of the filter effectively reduces the THD voltage value in the 400KW, 450KW, and 600KW DC motors to 4.34%, 5.38%, and 6.35% respectively.
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Glavatskih, S. B., and Michel Fillon. "TEHD Analysis of Thrust Bearings With PTFE-Faced Pads." Journal of Tribology 128, no. 1 (December 14, 2005): 49–58. http://dx.doi.org/10.1115/1.1843833.

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Results of a combined theoretical and experimental investigation into the operation of thrust bearings with polytetrafluoroethylene (PTFE)-faced pads are reported. Bearing performance is analyzed in terms of temperature, power loss, oil film thickness and pressure. These parameters are first calculated using a THD model. The effect of PTFE facing on bearing thermal performance is then presented and discussed. A TEHD model is subsequently employed. Obtained TEHD results show that oil film thickness and temperature are strongly affected by the PTFE layer. Theoretical results are compared with measured temperature, oil film thickness, and pressure.
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Kienker, Paul K., Zhengyan Wu, and Alan Finkelstein. "Mapping the membrane topography of the TH6–TH7 segment of the diphtheria toxin T-domain channel." Journal of General Physiology 145, no. 2 (January 12, 2015): 107–25. http://dx.doi.org/10.1085/jgp.201411326.

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Low pH triggers the translocation domain of diphtheria toxin (T-domain), which contains 10 α helices, to insert into a planar lipid bilayer membrane, form a transmembrane channel, and translocate the attached catalytic domain across the membrane. Three T-domain helices, corresponding to TH5, TH8, and TH9 in the aqueous crystal structure, form transmembrane segments in the open-channel state; the amino-terminal region, TH1–TH4, translocates across the membrane to the trans side. Residues near either end of the TH6–TH7 segment are not translocated, remaining on the cis side of the membrane; because the intervening 25-residue sequence is too short to form a transmembrane α-helical hairpin, it was concluded that the TH6–TH7 segment resides at the cis interface. Now we have examined this segment further, using the substituted-cysteine accessibility method. We constructed a series of 18 mutant T-domains with single cysteine residues at positions in TH6–TH7, monitored their channel formation in planar lipid bilayers, and probed for an effect of thiol-specific reagents on the channel conductance. For 10 of the mutants, the reagent caused a change in the single-channel conductance, indicating that the introduced cysteine residue was exposed within the channel lumen. For several of these mutants, we verified that the reactions occurred primarily in the open state, rather than in the flicker-closed state. We also established that blocking of the channel by an amino-terminal hexahistidine tag could protect mutants from reaction. Finally, we compared the reaction rates of reagent added to the cis and trans sides to quantify the residue’s accessibility from either side. This analysis revealed abrupt changes in cis- versus trans-side accessibility, suggesting that the TH6–TH7 segment forms a constriction that occupies a small portion of the total channel length. We also determined that this constriction is located near the middle of the TH8 helix.
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Nakaiwa, Koichi, Hiroyuki Wakiwaka, and Kunihisa Tashiro. "Analysis of Three Phase Linear Synchronous Motor Distortion Factor." Materials Science Forum 792 (August 2014): 239–44. http://dx.doi.org/10.4028/www.scientific.net/msf.792.239.

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The relation between the Electro Motive Force (EMF) and Total Harmonic Distortion (THD) was compared and verified by magnet arrangement. Using Halbach array, thrust was more increase by change of magnet arrangement. Moreover, the variable trend of cogging and THD by magnet ratio and magnet form change was checked.
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Khristiana, Harrij Mukti, Sudjito Soeparman, Slamet Wahyudi, and Rini Nur Hasanah. "Analysis of loss on single-phase dry transformers with non-linear load." Eastern-European Journal of Enterprise Technologies 5, no. 8 (113) (October 31, 2021): 17–22. http://dx.doi.org/10.15587/1729-4061.2021.240233.

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The paper studies power losses in transformers due to non-linear loads. The research aims to analyze the power loss in a single-phase dry transformer under a non-linear load. The research uses an SW43W Power supply type, FlukeView Power Quality Analyzer as a DC or AC power supply on the primary side of the transformer. The non-linear load is connected to the secondary side. The loading test of the dry transformer was carried out at non-linear loads. The load variations used 0 %; 12.5 %; 25 %; 37.5 %; 50 %; 62.5 %; 75 %; 87.5 % and 100 %, as well as variations in the THD value by adjusting the ignition angle (α). The non-linear loads used are Half-Wave Rectifier and Controlled Half-Wave Rectifier with resistive loads with variations in THD values. The results showed that the transformer losses comprised Pno load and Pload. The operation of the transformer with constant input voltage and frequency with THDv<5 % resulted in a constant Pno load value at all load values. The greater the percentage of the load, the higher the load. The increase in THD because of non-linear load will increase the load on the transformer. The value of the derating factor is obtained by connecting the increase in losses (∆PLosses), which is influenced by THD and the increase in temperature T(°C) in dry transformers. When the transformer is loaded with a non-linear load, the derating factor<1. THD and derating factor form a linear relationship, when THD increases, the derating factor value decreases. Linear load on the transformer causes a decrease in its capacity, but if it gets a non-linear load with THD=39.1 %, it can withstand a load of 84.294 %, besides the increase in total harmonic distortion will increase losses and reduce transformer capacity
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Salman, Layth S., and Harith Al-Badrani. "Design and performance analysis of asymmetric multilevel inverter with reduced switches based on SPWM." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 1 (March 1, 2023): 320. http://dx.doi.org/10.11591/ijpeds.v14.i1.pp320-326.

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<span lang="EN-US">Multilevel inverters have the benefit of producing high output voltage values with little distortion. This paper deals with decreasing total harmonic distortion (THD) and providing an output voltage with various step levels switching devices. In this study, a 27-level inverter with three asymmetric H-Bridge was designed and simulated based on level shift sinusoidal pulse-width modulation and phase shift sinusoidal pulse-width modulation methods. MATLAB/Simulink has been used to create this model and test it at different types of loads. The results showed that a multilevel inverter with (PS-PWM) produces less (THD) than a multilevel with (LS-PWM), when the resistive load was used, the produced voltage and current THD in (PS-PWM) and (LS-PWM) are 3.02% and 4.30% respectively, that has resulted from the linearity between voltage and current in the resistive load. While in the case of applying an inductive load, the THD in the voltage is constant in both (PS-PWM) and (LS-PWM) methods and has the same values as the THD in a resistive load. However, the THD in the current with inductive load decreased to 2.79% in (PS-PWM) and 4.04% in (LS-PWM). Finally, these results show that the performance of the proposed power circuit with PS-PWM is better than (LS-PWM).</span>
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Goncharevskyi, S., M. Makarchuk, and V. Martynyuk. "Temperature of representative areas of the breast department of the vegetative nervous system as the index of human organism functional state." Bulletin of Taras Shevchenko National University of Kyiv. Series: Problems of Physiological Functions Regulation 23, no. 2 (2017): 27–33. http://dx.doi.org/10.17721/2616_6410.2017.23.27-33.

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Almost all processes in the human body in one way or another connected with the autonomic nervous system. That's why it is real to evaluate the functional state of the person by temperature characteristics of representative points of the autonomic nervous system. Location and information of these points are confirmed by fundamental research. However, simply measuring the temperature at some points may not be sufficient to establish any systematic changes in the human body. The establishment of such changes requires systematic assessment of interdependent significant relationships between these parameters.The main aim of our research was to study effects of myocardial infarction in the thoracic region of the autonomic nervous system. The temperature of representative areas of the thoracic autonomic nervous system we measured by infrared thermometer (Medisana FTO D-53340 , with an accuracy of 0.1 degree Celsius). Statistical analysis was conducted in the packet Statistics 10. The presence of a difference in the temperature coefficients of representative areas (p<0,05). For the left side of the spine characterized by a difference in Th1–Th5 segments, which confirms their diagnosis: Th1 – 0,931,12 (control) and -0,797,49 (experiment), Th2 – 1,571,12 and -0,486,70, Th3 – 1,582611,12325 and -0,663,36, Th4 – 0,85913 0,92611 and -1,74,64, Th5 – 0,923480,75469 and-1,615,73 respectively. For the right side of the thoracic spines: Th6 – 0,850,73 (control) and -0,797,49 (experiment), Th7 – -1,000,79 and -1,370,69, Th8 – -0,960,73 and -0,990,68, Th9 – -0,120,64 and -0,380,83, Th10 – -0,921,14 and -1,031,00, Th11 – -1,691,05 and -1,861,06, Th12- -1,651,15 and -1,961,12 respectively. We found that myocardial infarction is manifested in the thoracic spine. In an experimental group there is significant difference of temperature in all segments. We can also notice asymmetry of temperatue between the right and left side of the spine. In the test group there are a deviation from the normal temperature in the first five thoracic segments on the left side, which confirms their diagnosis. On the right side of the spine there are a deviation in the last seven segments, which may indicate the compensatory mechanisms of regulation of the system. We can observe the temperature asymmetry, which in long-term exposure can negatively affect to the body.
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Yaqoob, Salam J., Jawad K. Raham, and Hassan A. Sadiq. "Analysis and Simulation of Current-source Flyback Inverter with Efficient BCM Control Strategy." WSEAS TRANSACTIONS ON ELECTRONICS 12 (November 8, 2021): 132–40. http://dx.doi.org/10.37394/232017.2021.12.18.

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The Flyback inverter is a single-stage power inverter which represent an attractive solution for photovoltaic (PV) grid-tied inverter application. The main advantages of a current-source flyback inverter are high power density and high efficiency due to its small, as well as low total harmonic distortion (THD) operation. However, a flyback topology works with Discontinuous Conduction Mode (DCM) control strategy has lower efficiency and poor THD values. In this paper, an efficient current-source flyback inverter topology works with Boundary Conduction Mode (BCM) control strategy is presented. Besides, an efficient incremental conductance (IC) maximum power point tracking (MPPT) is used to extract the maximum power from the PV module. To verify the proposed control a power simulator (PSIM) software is used. As a result, the simulation results indicates that the BCM control is more efficient than the DCM method for various weather conditions. Finally, the proposed BCM strategy is compared with DCM control in terms of THD and thus it is achieved lower THD contain in the injection current of grid.
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Dissertations / Theses on the topic "THD ANALYSIS"

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Zhang, Di. "Analysis and Design of Paralleled Three-Phase Voltage Source Converters with Interleaving." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/27579.

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Three-phase voltage source converters(VSCs) have become the converter of choice in many ac medium and high power applications due to their many advantages, including low harmonics, high power factor, and high efficiency. Modular VSCs have also been a popular choice as building blocks to achieve even higher power, primarily through converter paralleling. In addition to high power ratings, paralleling converters can also provide system redundancy through the so-called (N+1) configuration for improved availability, as well as allow easy implementation of converter power management. Interleaving can further improve the benefit of paralleling VSCs by reducing system harmonic currents, which potentially can increase system power density. There are many challenges to implement interleaving in paralleled VSCs system due to the complicated relationships in a three-phase power converter system. In addition, to maximize the benefit of interleaving, current knowledge of symmetric interleaving is not enough. More insightful understanding of this PWM technology is necessary before implement interleaving in a real paralleled VSCs system. In this dissertation, a systematic methodology to analyze and design a paralleled three-phase voltage source converters with interleaving is developed. All the analysis and proposed control methods are investigated with the goal of maximizing the benefit of interleaving based on system requirement. The dissertation is divided into five sections. Firstly, a complete analysis studying the impact of interleaving on harmonic currents in ac and dc side passive components for paralleled VSCs is presented. The analysis performed considers the effects of modulation index, pulse-width-modulation (PWM) schemes, interleaving angle and displacement angle. Based on the analysis the method to optimize interleaving angle is proposed. Secondly, the control methods for the common mode (CM) circulating current of paralleled three-phase VSCs with discontinuous space-vector modulation (DPWM) and interleaving are proposed. With the control methods, DPWM and interleaving, which is a desirable combination, but not considered possible, can be implemented together. In addition, the total flux of integrated inter-phase inductor to limit circulating current can be minimized. Thirdly, a 15 kW three phase ac-dc rectifier is built with SiC devices. With the technologies presented in this dissertation, the specific power density can be pushed more than 2kW/lb. Fourthly, the converter system with low switching frequency is studied. Special issues such as beat phenomenon and system unbalance due to non-triplen carrier ratio is explained and solved by control methods. Other than that, an improved asymmetric space vector modulation is proposed, which can significantly reduce output current total harmonic distortion (THD) for single and interleaved VSCs system. Finally, the method to protect a system with paralleled VSCs under the occurrence of internal faults is studied. After the internal fault is detected and isolated, the paralleled VSCs system can continue work. So system reliability can be increased.
Ph. D.
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Mazumdar, Joy. "System and method for determining harmonic contributions from nonlinear loads in power systems." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/23215.

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The objective of this research is to introduce a neural network based solution for the problem of measuring the actual amount of harmonic current injected into a power network by an individual nonlinear load. Harmonic currents from nonlinear loads propagate through the system and cause harmonic pollution. As a result, voltage at the point of common coupling (PCC) is rarely sinusoidal. The IEEE 519 harmonic standard provides customer and utility harmonic limits and many utilities are now requiring their customers to comply with IEEE 519. Measurements of the customer’s current at the PCC are expected to determine the customer’s compliance with IEEE 519. However, results in this research show that the current measurements at the PCC are not always reliable in that determination. In such a case, it may be necessary to determine what the customer’s true current harmonic distortions would be if the PCC voltage could be a pure sinusoidal voltage. However, establishing a pure sinusoidal voltage at the PCC may not be feasible since that would mean performing utility switching to reduce the system impedance. An alternative approach is to use a neural network that is able to learn the customer’s load admittance. Then, it is possible to predict the customer’s true current harmonic distortions based on mathematically applying a pure sinusoidal voltage to the learned load admittance. The proposed method is called load modeling. Load modeling predicts the true harmonic current that can be attributed to a customer regardless of whether a resonant condition exists on the utility power system. If a corrective action is taken by the customer, another important parameter of interest is the change in the voltage distortion level at the PCC due to the corrective action of the customer. This issue is also addressed by using the dual of the load modeling method. Topologies of the neural networks used in this research include multilayer perceptron neural networks and recurrent neural networks. The theory and implementation of a new neural network topology known as an Echo State Networks is also introduced. The proposed methods are verified on a number of different power electronic test circuits as well as field data. The main advantages of the proposed methods are that only waveforms of voltages and currents are required for their operation and they are applicable to both single and three phase systems. The proposed methods can be integrated into any existing power quality instrument or can be fabricated into a commercial standalone instrument that could be installed in substations of large customer loads, or used as a hand-held clip on instrument.
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Miksl, Jan. "Analýza, vlastnosti a aplikace komerčně dostupných proudových násobiček." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219150.

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The diploma thesis deals with analysis, validation, measurement of parameters of the commercially available current multiplies (namely the EL2082 and EL4083) and their applications in practice. Control analysis are carried out in OrCAD PSpice program and compared with values from datasheets. Control analysis are focused on AC and DC characteristics of these active blocks. There are discusses the input impedance, the output impedance, the current gain and the possibility of electronic adjusting. The parameters of the elements were verified by measurements. Proposals for circuit applications (selective circuit, oscillator, frequency filter) with EL2082 and EL4083 are presented and analyzed in the program OrCAD. Three oscillator circuit designs are experimentally tested and the results are compared with the theoretical expectations and simulations in OrCAD. The possibility of electronic control for oscillators is examined. Also the sensitivity and the tolerance analysis are carried out. The constructional details of oscillators are presented at the end of this work.
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Gould, Matthew. "An economic analysis of the Councils of the United Nations." Thesis, University of Westminster, 2014. https://westminsterresearch.westminster.ac.uk/item/8yqqv/an-economic-analysis-of-the-councils-of-the-united-nations.

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This thesis consists of three pieces of research focussed on the Councils of the United Nations, predominantly the United Nations Security Council (UNSC). We consider three broad questions: which countries typically get on to the UNSC in its current form; which countries ought to get on to the UNSC; and how well might proposed changes to the UNSC steer it towards such ideals. In order to address the latter two questions it is sensible to begin by investigating how the current system works and if there are any particular characteristics which influence the chances of a country being elected to the UNSC. In Chapter 2 we develop a model to test the significance of a country’s characteristics on their probability of election to the UNSC. Chapter 3 then starts by developing a set of theoretical tests which can be applied to council voting systems, such as the selection of UNSC members from the UN General Assembly. The tests score a voting system based on how well the distribution of power in the council meets the power one would expect under a system where country representatives cast their vote in the council based on the outcomes of country or regional-level referendums. We then apply this, using the implied probabilities of election which are a consequence of the results of Chapter 2, to the UNSC election process. We then finish by applying the tests of Chapter 3, which consider how equitable a proposal is, together with a further test of procedural efficiency, to each of the proposed reforms to the UNSC election process.
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Neužil, Jan. "Uživatelské rozhraní pro HP89410A." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217775.

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The aim of this thesis was to develop user interface in LabVIEW to make typical measurements with spectral analyzer HP89410A There is introduced the theory of operation of an analogue heterodyne and a digital FFT spectral analyzer. It is explained the background of the Fast Fourier Transform. There are discussed the key settings in measuring with FTT analyzer, like window function, bandwidth, number of frequency points, or the averaging. Further is described the program, which was developed for measuring frequency characteristic by white noise and by stepped measurement. It was also made a module for measuring Signal to Noise Ratio and module for Total Harmonic Distortion. In the last part of this thesis are shown the results of processed exemplar measurements.
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Alissa, Arwa. "Islamic mortgages : a comparative study to improve the legal and financial system of mortgages in the Royal Kingdom of Saudi Arabia with a regulatory analysis of the US and UK, and case analyses of the UK, Sharjah, Dubai and Saudi Arabia." Thesis, University of Westminster, 2018. https://westminsterresearch.westminster.ac.uk/item/q8q83/islamic-mortgages-a-comparative-study-to-improve-the-legal-and-financial-system-of-mortgages-in-the-royal-kingdom-of-saudi-arabia-with-a-regulatory-analysis-of-the-us-and-uk-and-case-analyses-of-the.

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This research is the first comprehensive critical evaluation of the ways in which Islamic mortgages can be developed and executed in a Sharia compliant manner in order to boost the development of housing markets primarily in Saudi Arabia, with regulatory analyses of securitisation in the US and EU, and case analyses of the UK, Sharjah, and Dubai. The regulatory analyses of securitization show how the excesses of modern financial legal techniques to greatly expand opportunistic developments of mortgagebacked markets led to market failures, and that such market failure could be avoided by the use of Islamic finance principles. These case analyses have been selected to provide a spectrum of different socio-economic contexts in which to compare the Saudi Arabian system. The study also engages in the examination of the Western and Islamic legal systems and their impact on mortgaging and securitisation theory and practice. Securitisation, namely the activity involving the packaging, dividing and selling of mortgages in the primary market has in recent years become a well-established business process (with banking, financing and legal implications and aspects) for enhancing home financing and home ownership in the USA, the UK and Western Europe, all of which are subject to common law contractual processes. However, it would be natural to suppose that further development of the Saudi Arabian and other Islamic legal systems would include securitisation techniques in the near future. Indeed, certain Islamic finance structures lend themselves to securitisation processes which are investigated in depth in this work. Banking and financial activities in the Islamic countries are however governed by a mix of conventional practice, common law and Islamic law, with variations occurring in the same between different jurisdictions. This study aims to engage in a detailed comparison of the conventional (Western) banking system and the banking procedures and processes followed in Islamic jurisdictions in order to develop and recommend a standardized securitisation system for mortgages, which draws upon the best of western regulations and practices and is yet compliant with Islamic law, i.e. the Sharia. The Western banking system is based upon intermediation between entities that have money and ones that need to use it, the charging of interest and a rational decisionmaking process between banks and their clients. The Islamic system on the other hand is governed by Islamic law, which prohibits interest, speculation and any type of activity that is perceived to be oppressive. It recommends close partnerships between bankers andclients, rather than short-term transactional utility. The establishment of common ground between these two systems is undoubtedly a challenging task, particularly because of the differences in the interpretation of religious law by different clerics. This study however points out that significant common ground can be established if standardisation of legal practices and bank policies can be achieved in Islamic countries. The development of high levels of standardisation will help in the creation of securitisation processes for housing mortgages that are Sharia compliant and thus satisfy two important objectives, namely religious requirements and the expansion of the housing market.
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Sristy, Kiranmayi Venkata. "Analysis of a Turbopiston Pump." ScholarWorks@UNO, 2006. http://scholarworks.uno.edu/td/413.

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An innovative pump, TurboPiston Pump, has been invented to incorporate the merits of centrifugal, axial, and positive displacement pumps. The TurboPiston pump is designed to deliver large flow rates at very high pressure of up to 1000 psia. To improve the original design, an understanding of flow behavior inside the pump is needed. Therefore, this thesis focuses on simulating the flow field inside the pump and studying its performance. This study includes modeling the pump using a commercial CAD package, GAMBIT and a 3-D computational fluid dynamic (CFD) solver, FLUENT. The calculation employs both the simplified steady moving frame and the complicated transient sliding mesh schemes. The flow pattern, static pressure distribution, and total pressure losses are calculated and analyzed. The regions of high total pressure losses and potential creation of cavitation are identified. Design changes are recommended to minimize cavitation and total pressure losses to improve the pump performance.
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Bienvenu, Kirk Jr. "Underwater Acoustic Signal Analysis Toolkit." ScholarWorks@UNO, 2017. https://scholarworks.uno.edu/td/2398.

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This project started early in the summer of 2016 when it became evident there was a need for an effective and efficient signal analysis toolkit for the Littoral Acoustic Demonstration Center Gulf Ecological Monitoring and Modeling (LADC-GEMM) Research Consortium. LADC-GEMM collected underwater acoustic data in the northern Gulf of Mexico during the summer of 2015 using Environmental Acoustic Recording Systems (EARS) buoys. Much of the visualization of data was handled through short scripts and executed through terminal commands, each time requiring the data to be loaded into memory and parameters to be fed through arguments. The vision was to develop a graphical user interface (GUI) that would increase the productivity of manual signal analysis. It has been expanded to make several calculations autonomously for cataloging and meta data storage of whale clicks. Over the last year and a half, a working prototype has been developed with MathWorks matrix laboratory (MATLAB), an integrated development environment (IDE). The prototype is now very modular and can accept new tools relatively quickly when development is completed. The program has been named Banshee, as the mythical creatures are known to “wail”. This paper outlines the functionality of the GUI, explains the benefits of frequency analysis, the physical models that facilitate these analytics, and the mathematics performed to achieve these models.
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Baklanova, Viktoria. "Money market funds in the US and the EU : a legal and comparative analysis." Thesis, University of Westminster, 2012. https://westminsterresearch.westminster.ac.uk/item/8z40w/money-market-funds-in-the-us-and-the-eu-a-legal-and-comparative-analysis.

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The failure of the Reserve Primary Fund, a US money market fund, in September 2008 triggered a widespread withdrawal of assets from other money market funds in the US. The withdrawals led the US Government to adopt emergency measures to maintain market stability. The ability of money market funds to rapidly withdraw funding from the financial system also showed during the European sovereign debt crisis in the summer of 2011. The crisis prompted further regulatory debate on both sides of the Atlantic on how to make money market funds more resilient to investors’ runs and systemic shocks. The solutions that are currently discussed propose to eliminate the essential bank-like feature of money market funds – their ability to transact at a stable share price – and thereby reduce their attractiveness to investors seeking cash management options outside the banking system. This thesis detaches from those discussions originally enquiring on how should money market funds be regulated in the US and in the EU. As a theoretical premise, this research identifies two overarching goals for money market funds regulation, namely, investor protection and systemic stability. The prevalent proposals for regulation are thus seen as misguided because the change in money market funds pricing mechanisms and the accounting convention would demonstrably not satisfy these goals. In order to formulate the new propositions for the regulation of money market funds in the US and the EU, therefore, this thesis first critically evaluates the existing US and EU regulatory frameworks applicable to money market funds from the standpoint of the dual policy goal of investor protection and systemic stability. Secondly, it introduces an alternative path for achieving this dual goal. It is argued that the blueprint of the international money market fund regulation ought to focus on full disclosure of the funds’ assets and liabilities – portfolio holdings and fund investors – as the primary measure of investor protection. Such disclosure also addresses systemic stability concerns by empowering regulators to properly monitor the transmission channels of funding risk. While my study does not purport to do away with risk limiting rules for money market funds, it cautions against copying the US-centric view of the investment standards to the much shallower European markets under the banners of harmonisation. Instead, this thesis advocates a harmonised international approach to the transparency of money market fund activities and the creation of a global database of market 5 exposures that would subject asset managers to public scrutiny and enable regulators to monitor the major risk transmitting channels. By these means the dual regulatory goal in money market fund regulation – investor protection and systemic stability – shall be upheld.
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Vestrelli, Francesco. "Study on membrane contactors performances analysis, system simulations and fields of application /." Online version, 2006. http://dds.crl.edu/CRLdelivery.asp?tid=12327.

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Books on the topic "THD ANALYSIS"

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Leithold, Louis. The calculus with analytic geometry. 6th ed. New York: Harper & Row, 1990.

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Leithold, Louis. The calculus with analytic geometry. 6th ed. New York, NY: Harper & Row, 1990.

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The calculus with analytic geometry. 5th ed. New York: Harper & Row, 1986.

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Analysis analysed: When the map becomes the territory. London: Routledge, 1993.

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W, Martin J. The local chemical analysis of materials. Amsterdam: Elsevier, 2003.

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Selwyn, Lyndsie. Analysis of the chloride ion concentration in aqueous solutions by potentiometric titration. Ottawa, Ont: Canadian Conservation Institute, 2001.

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Jonas, Oswald. Introduction to the theory of Heinrich Schenker: The nature of the musical work of art. New York: Schirmer Books, 1989.

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Analytic philosophy: The history of an illusion. London: Continuum, 2010.

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Das, Arbind. bakwas: An analysis. Delhi: Pratibha Prakashan, 1996.

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Real analysis: An introduction to the theory of real functions and integration. Boca Raton: Chapman & Hall/CRC, 2001.

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Book chapters on the topic "THD ANALYSIS"

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Tripathi, Shashi Shekhar, Manoj Kumar Kar, and A. K. Singh. "Comparative THD Analysis of Multi-level Inverter Using SPWM Scheme." In Smart Structures in Energy Infrastructure, 41–47. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4744-4_5.

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Grigor’ev, B. S., A. E. Fedorov, and J. Schmied. "New Mathematical Model for the Morton Effect Based on the THD Analysis." In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 2243–53. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_184.

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Agrawal, Nikhil, Praveen Bansal, and Niraj Umale. "THD Analysis of New Multilevel Inverter Topology with Different Modulation Techniques." In International Conference on Intelligent Computing and Smart Communication 2019, 1197–209. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0633-8_117.

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Priya, M., Ponnambalam Pathipooranam, and K. Muralikumar. "THD Analysis of Flying-Capacitor Multilevel Converter Using Fuzzy Logic Controller." In Advances in Intelligent Systems and Computing, 105–17. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0035-0_9.

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Jennela, Sravani, and V. Raj Kumar. "THD Analysis of One-Cycle and PWM Controlled Active Power Filters." In Lecture Notes in Electrical Engineering, 225–36. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2119-7_23.

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Tripathi, Shashi Shekhar, Manoj Kumar Kar, and Arun Kumar Singh. "Comparative THD Analysis of Multilevel Inverter Using Different Multicarrier PWM Schemes." In Recent Advances in Power Electronics and Drives, 69–79. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9239-0_6.

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Ammal Dhanalakshmi, M., M. Parani Ganesh, and Keerthana Paul. "Analysis of Optimum THD in Asymmetrical H-Bridge Multilevel Inverter Using HPSO Algorithm." In Proceedings of 2nd International Conference on Intelligent Computing and Applications, 561–69. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1645-5_47.

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Rodríguez-Molano, José Ignacio, Hugo A. Serrato, and Carlos A. Parra. "Analysis THD and Power Factor for Luminaries Implemented in the Traffic Light System of Bogota." In Communications in Computer and Information Science, 283–94. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-50880-1_25.

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Havel, Ales, Martin Sobek, and Petr Chamrad. "Analysis of Efficiency and THD in 7-Level Voltage Inverters with Reduced Number of Switches." In Lecture Notes in Electrical Engineering, 736–46. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-14907-9_71.

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Mohanty, Rupali, Swati Suman, and Debashis Chatterjee. "Comparison Analysis of THD Optimization Using PSO and Jaya Algorithm in Reduced H-bridge Multilevel Inverter." In Lecture Notes in Mechanical Engineering, 683–96. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3497-0_55.

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Conference papers on the topic "THD ANALYSIS"

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Barnes, Michael D., William B. Whitten, and J. Michael Ramsey. "Single-Molecule Detection in Microdroplets." In Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/laca.1994.thd.1.

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Detection of single molecules in condensed phase with high signal-to-noise ratios is important for applications which involve detection of fluorescent tags such as DNA sequencing1, fluorescence immunoassay2, or hydrology.3 In addition, observation of photophysical phenomena unique to the interaction of a radiation field with an isolatedmolecule, such as photon antibunching,4 depends upon having such high sensitivity. As demonstrated by the experiments of Moerner5 and Orrit,6 very high sensitivity at the single molecule level can be achieved by probing "guest" molecules in solid hosts at cryogenic temperatures. However, practical applications requiring single molecule detection usually require measurements on liquid phase solutions at room temperature. These demands pose new problems such as solvent dependent quantum yield, finite photochemical lifetime (the number of absorption-emission cycles which occur before irreversible bleaching of fluorescence), and solvent Raman scattering and fluorescence.
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Xie, X. Sunney, and Robert C. Dunn. "Fluorescence Spectroscopy on a Single Molecule Basis with a Near-field Spectrometer." In Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/laca.1994.thd.4.

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Recent advances in near-field optical microscopy [1] have offered exciting possibilities for conducting molecular spectroscopy at the nanometer dimension. In particular, fluorescence detection of single chromophores and single proteins containing several chromophores have been achieved using this technique[2][3]. For chemical analysis and biological applications, fluorescence measurements with near-field optics will be particularly informative, providing spectroscopic information not accessible with other scanning probe techniques, such as SEM, STM and AFM.
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Davis, Lloyd M., and Li-Qiang Li. "Monte Carlo Model of a Single Molecule Counting Experiment." In Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/laca.1994.thd.2.

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In experiments for fluorescence detection of single molecules in solution the background due to unrejected scattered light increases linearly with laser power while the dye molecule fluorescence signal and photodegradation probability saturate.
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Castro, Alonso, and Brooks Shera. "Electrophoresis of Single Fluorescent Molecules." In Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/laca.1994.thd.3.

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The fast, efficient detection and separation of minute quantities of biologically important molecules plays a central role in a variety of fields, such as molecular biology, biotechnology, immunology, medical diagnostics, and forensic analysis. It has proven difficult to identify and separate biomolecules at such low concentrations by existing means. Thus, it is of importance to develop methods that are able to probe such low concentrations with adequate sensitivity, resolution and ease. Here, we describe a new method for detecting and identifying individual fluorescent molecules in solution. The technique involves the measurement of electrophoretic velocities of individual molecules in a mixture, and identification by comparison with the electrophoretic velocity known to be characteristic of a particular molecular species. The application of the method to the detection and size identification of DNA restriction fragments in solution at the single molecule level has been demonstrated. In a similar experiment, the electrophoretic velocities of single molecules of the protein phycoerythrin was determined. Although we have focused on the detection and identification of biologically important molecules, the technique has the potential to find applications in organic and inorganic chemical analysis.
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Joca, Davi R., Luiz H. S. C. Barreto, Denercil de S. Oliveira, Paulo P. Praca, Ranoyca N. A. L. Silva, and Gustavo A. L. Henn. "THD analysis of a modulation technique applied for THD reduction." In 2013 Brazilian Power Electronics Conference (COBEP 2013). IEEE, 2013. http://dx.doi.org/10.1109/cobep.2013.6785112.

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Abrams, M. C., M. R. Gunson, L. L. Lowes, R. Zander, and C. P. Rinsland. "Atmospheric Trace Molecule Spectroscopy (ATMOS) Data Analysis Method." In Optical Remote Sensing of the Atmosphere. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/orsa.1993.thd.5.

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The Atmospheric Trace Molecule Spectroscopy (ATMOS) experiment makes use of a Fourier transform spectrometer to measure solar spectra from the Space Shuttle payload bay. The data analysis strategy and method used during the ATLAS-1 mission will be described.
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Oberlé, J., J.-Y. Bigot, and A. Daunois. "Theoretical Analysis of Transverse and Crosstalk Effects in Thermooptic Absorptive Bistability." In Optical Bistability. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/obi.1988.thd.4.

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Fast switching times in thermooptic bistable elements held by a cw laser beam and driven by an external pulse have been observed [1,2,3]. An overheating of the nonlinear material may occur during the switching. In this case, a complicated switching behavior is observed [4]. This dynamics can be understood if the temporal variation of the medium temperature is calculated [5]. Moreover, in the experiments with CdS platelets, the transport of heat is very important and the complete spatio-temporal dynamics must be taken into account.
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Mahendran, N., and G. Gurusamy. "THD analysis of matrix converter fed load." In 2009 International Conference on Power Electronics and Drive Systems (PEDS 2009). IEEE, 2009. http://dx.doi.org/10.1109/peds.2009.5385722.

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George, Merin Lizbeth, and P. Abirami. "THD analysis between 5LT2C and 7LT2C inverter." In 2017 International Conference on Computation of Power, Energy Information and Commuincation (ICCPEIC). IEEE, 2017. http://dx.doi.org/10.1109/iccpeic.2017.8290446.

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Ozel, Akin, and Nusret Tan. "Analysis of PFC and THD with the boost converter." In 2015 23th Signal Processing and Communications Applications Conference (SIU). IEEE, 2015. http://dx.doi.org/10.1109/siu.2015.7130126.

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Reports on the topic "THD ANALYSIS"

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Estrella, Tony, Carla Alfonso, Lluis Capdevila, and Josep-Maria Losilla. Machine learning for the analysis of healthy lifestyle data: a scoping review protocol. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, March 2023. http://dx.doi.org/10.37766/inplasy2023.3.0065.

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Review question / Objective: The objective of this scoping review is to identify and characterize machine learning algorithms used in data analysis of healthy lifestyle. The specific objectives are the study of a) terminology, b) healthy lifestyle variables analysed either input or output, c) programs and libraries used to analyse data, and d) sources, types, and quality of data analysed. Eligibility criteria: In this scoping review the inclusion criteria from studies that provide empirical information are as follows: a) studies must use machine learning models either supervised or unsupervised learning to analyses lifestyle data (input or output), b) studies must use real data from individuals for analysis, and c) the language of the studies must be English or Spanish. Furthermore, theorical studies focusing on a) the mathematical approach to explain algorithm construction, and b) guidelines for implementing the use of machine learning in the field of health will be excluded. Additionally, studies with simulated data and those aiming to develop a robot or app based on machine learning will be excluded. Regarding lifestyle, studies whose main topic is substance use, such as alcohol intake, or those related to smoking cessation will be manually excluded.
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Hacker, Elizabeth, and Ranjama Sharma. Life Stories From Kathmandu’s Adult Entertainment Sector: Told and Analysed by Children and Young People. Institute of Development Studies, December 2022. http://dx.doi.org/10.19088/clarissa.2022.005.

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Child Labour: Action-Research-Innovation in South and South-Eastern Asia (CLARISSA) has a participatory and child-centred approach that supports children to gather evidence, analyse it themselves and generate solutions to the problems they identify. The life story collection and collective analysis processes supported children and young people involved in the worst forms of child labour in Kathmandu to share and analyse their life stories. Four hundred life stories were collected and then analysed by children and young people engaged in and affected by the worst forms of child labour, including those who had previously been life storytellers and/or life story collectors. The data was collectively analysed using causal mapping, resulting in children’s life stories becoming the evidence base for revealing the macro-level system dynamics that drive the worst forms of child labour. This paper is a record of the children and young people’s analysis of the life stories and the key themes they identified, which formed the basis of a series of eight child-led Participatory Action Research groups based in Kathmandu.
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FINFROCK, S. H. Accident Analyses in Support of the Sludge Water System Safety Analysis. Office of Scientific and Technical Information (OSTI), August 2002. http://dx.doi.org/10.2172/808224.

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Banzhaf, H. Spencer. The Value of Statistical Life: A Meta-analysis of Meta-analyses. Cambridge, MA: National Bureau of Economic Research, August 2021. http://dx.doi.org/10.3386/w29185.

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Thomas, Angela. An Inquiry into the Efficiency of Carbon Pricing Policy: A study of Sweden, United Kingdom, and Japan. Web of Open Science, October 2020. http://dx.doi.org/10.37686/nsrl.v1i2.75.

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This study uses an exploratory research methodology to analyse the efficiency of carbon pricing policies in driving sustainable development by effectively reducing carbon emissions, encouraging research and development of alternative energy sources and innovations. The study also attempts to assess the impact of carbon pricing as a driver for inclusive growth. This is through the analysis of relevant indicators to evaluate the distributive policies used by the governments to mitigate the disproportionate effect of lower income households is analysed
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Reilly, Scott N. The Model Analyst's Toolkit: Scientific Model Development, Analysis, and Validation. Fort Belvoir, VA: Defense Technical Information Center, August 2014. http://dx.doi.org/10.21236/ada609277.

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Reilly, Scott N. The Model Analyst's Toolkit: Scientific Model Development, Analysis, and Validation. Fort Belvoir, VA: Defense Technical Information Center, May 2013. http://dx.doi.org/10.21236/ada580485.

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Reilly, Scott N. The Model Analyst's Toolkit: Scientific Model Development, Analysis, and Validation. Fort Belvoir, VA: Defense Technical Information Center, November 2013. http://dx.doi.org/10.21236/ada595295.

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Reilly, Scott N. The Model Analyst's Toolkit: Scientific Model Development, Analysis, and Validation. Fort Belvoir, VA: Defense Technical Information Center, February 2014. http://dx.doi.org/10.21236/ada601428.

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Reilly, Scott N. The Model Analyst's Toolkit: Scientific Model Development, Analysis, and Validation. Fort Belvoir, VA: Defense Technical Information Center, May 2014. http://dx.doi.org/10.21236/ada604461.

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