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1
Yu, Xueyang. "FINITE ELEMENT ANALYSIS OF FACTORS INFLUENCING DISPLACEMENT MEASUREMENT USING PLANAR INDUCTIVE SENSORS." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1586791378508492.
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Usman, Muhammad. "Inductive weld of joints for optical fiber pipe." Thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-32065.
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The current study presents an induction heating system design for fiber optics pipes joints. Remote heating methods are probably inconvenient due to non-uniform heat distribution resulting in unreliable joints. The induction heating generates uniform heat distribution which can be achieved by proper designing of inductive heating coil, and power system inverter that drives the induction system. Two different shaped open jaw type heating coils were designed i.e open claw type coil (OCTC) and curved spiral rectangular coil (CSRC). The coils were designed in COMSOL simulation software to check the coil and workpiece behaviours. These coil designs were then wounded by hand and resistance and inductance of each coil were measured. The OCTC is a short loop coil, having small inductance while the CSRC has a long loop so its inductance is high. CSRC design was selected in the current application. The CSRC inductance was calculated through modified Wheeler formula and current sheet approximation. To design the power inverter, firstly the power density of heating material i.e workpiece was calculated. Then the thermal losses of the coil were calculated, these losses were due to skin effect and proximity effect; and switch losses due to drain to source resistance(RDS) of Mosfets were estimated. The Mazzilli inverter was proposed for power system inverter design which works as a parallel resonant circuit. It was designed in Mandi simulation software and then implemented on hardware. Theoretical results were compared with the practical measurements through Matlab software. Coil efficiency, power inverter efficiency and overall system efficiency were also calculated. This induction heating method for fiber optics joints is repeatable, consistent, generates uniform heat and is more convenient for site-specific heat generated on workpiece. It is portable, user friendly and environmental friendly as well.
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Mugundu, Ganesh. "Pharmacogenetic Impact on Metabolism and Cytochrome P450 (CYP)3A Inductive Effect of Tamoxifen." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1266596002.
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Shi, Xiaochuan. "Effect of Electron Bombardment on the Size Distribution of Negatively Charged Droplets Produced by Electrospray." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-dissertations/15.
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This study explores an innovative approach to control the droplet size distribution produced by an electrospray with the intention of eventually being able to deliver precisely controlled quantities of precursor materials for nanofabrication. The technique uses a thermionic cathode to charge the droplets in excess of the Rayleigh limit, leading to droplet breakup or fission. The objective of these experiments was to assess whether the proposed technique could be used to produce a new droplet size distribution with a smaller mean droplet diameter without excessively broadening the distribution. An electrospray was produced in a vacuum chamber using a dilute mixture of ionic liquid. During their transit from the capillary source to a diagnostic instrument, the resulting droplets were exposed to an electron stream with controlled flux and kinetic energy. The droplets were sampled in an inductive charge detector to characterize changes in the size distribution. A positively biased anode electrode was used to collect electron current during droplet exposure. This collected current was used as the primary control variable and used as a measure of the electron flux. The anode bias voltage was a secondary control variable and used as a measure of the electron energy. In a series of seven tests, two sets showed evidence of fission having occurred resulting in the formation of two droplet populations after electron bombardment. Three sets of results showed evidence of a single droplet population after electron bombardment, but shifted to a smaller mean diameter, and one set of results was inconclusive. Because of the large standard deviation in the droplet diameter distributions, the two cases in which a second population was evident were the strongest indication that droplet fission had occurred.
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Lu, Ming. "Synergetic Attenuation of Stray Magnetic Field in Inductive Power Transfer." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/78621.
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Significant stray magnetic field exists around the coils when charging the electric vehicles (EVs) with inductive power transfer (IPT), owning to the large air gap between the transmitter and receiver. The methods for field attenuation usually introduce extra losses and reduce the efficiency. This study focuses on the synergetic attenuation of stray magnetic field which is optimized simultaneously with the efficiency. The optimization is realized with Pareto front.
In this dissertation, three methods are discussed for the field attenuation. The first method is to tune the physical parameters of the winding, such as the inner radii, outer radii, distribution of the turns, and types of the litz wires. The second method is to add metal shields around the IPT coils, in which litz wires are used as shields to reduce the shielding losses. The third method is to control the phases of winding currents, which avoids increasing the size and weight of the IPT coils.
To attenuate the stray magnetic field by tuning the physical parameters, the conventional method is to sweep all the physical parameters in finite-element simulation. This takes thousands of simulations to derive the Pareto front, and it's especially time-consuming for three-dimensional simulations. This dissertation demonstrates a faster method to derive the Pareto front. The windings are replaced by the lumped loops. As long as the number of turns for each loop is known, the efficiency and magnetic field are calculated directly from the permeance matrices and current-to-field matrices. The sweep of physical parameters in finite-element simulation is replaced by the sweep of the turns numbers for the lumped loops in calculation. Only tens of simulations are required in the entire procedure, which are used to derive the matrices. An exemplary set of coils was built and tested. The efficiency from the matrix calculation is the same as the experimental measurement. The difference for stray magnetic field is less than 12.5%.
Metal shields attenuate the stray magnetic field effectively, but generates significant losses owning to the uneven distribution of shield currents. This dissertation uses litz wires to replace the conventional plate shield or ring shield. Skin effect is eliminated so the shield currents are uniformly distributed and the losses are reduced. The litz shields are categorized to two types: shorted litz shield and driven litz shield. Circuit models are derived to analyze their behaviors. The concept of lumped-loop model is applied to derive the Pareto front of efficiency versus stray magnetic field for the coils with litz shield. In an exemplary IPT system, coils without metal shield and with metal shields are optimized for the same efficiency. Both the simulation and experimental measurement verify that the shorted litz shield has the best performance. The stray magnetic field is attenuated by 65% compared to the coils without shield.
This dissertation also introduces the method to attenuate the stray magnetic field by controlling the phases of winding currents. The magnetic field around the coils is decomposed to the component in the axial direction and the component in the radial direction. The axial component decreases with smaller phase difference between windings' currents, while the radial component exhibits the opposite property. Because the axial component is dominant around the IPT coils, decreasing the phase difference is preferred. The dual-side-controlled converter is applied for the circuit realization. Bridges with active switches are used for both the inverter on the transmitter side and the rectifier on the receiver side. The effectiveness of this method was verified both in simulation and experiment. Compared to the conventional series-series IPT with 90° phase difference between winding currents, stray magnetic field was attenuated by up to 30% and 40% when the phase differences of winding currents are 50° and 40°, respectively.
Furthermore, an analytical method is investigated to calculate the proximity-effect resistance of the planar coils with ferrite plate. The objective of this method is to work together with the fast optimization which uses the lumped-loop model. The existence of the ferrite plate complicates the calculation of the magnetic field across each turn which is critical to derive the proximity-effect resistance. In this dissertation, the ferrite plate is replaced by the mirrored turns according to the method of image. The magnetic fields are then obtained from Ampere's Law and Biot-Savart Law. Up to 200 kHz, the difference of the proximity-effect resistance is less than 15% between calculation and measurement.<br>Ph. D.
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Rijn, Dirk Hendrik van. "Exploring the limited effect of inductive discovery learning computational models and model-based analyses /." [Amsterdam : Amsterdam : EPOS, experimenteel-psychologische onderzoekschool] ; Universiteit van Amsterdam [Host], 2003. http://dare.uva.nl/document/68567.
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Wright, Emily Gail. "Combining Blocked and Interleaved Presentation During Passive Study and Its Effect on Inductive Learning." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1492602935015415.
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Ibrar, Ibrar. "Study of the effect of temperature on the metrological characteristics of Inductive Current Transformers." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
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The presented thesis focused on the study of effect of temperature and different loading condition of an inductive current transformer for medium voltage purposes. Equivalent circuit parameters behavior of the current transformer is analyzed for two different temperatures 24°C and 60°C and varying working conditions (current and voltage). Application of Short Circuit and Open circuit test is done for the current transformer under test with varying loading conditions and two temperatures of interest.
Interesting behavior of the shunt parameters of the current transformers are of most attention and can be implemented during modeling a current transformer.
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Harkess, Richard Lee. "Floral initiation in Rudbeckia hirta: limited inductive photoperiod, polyamines and cytokinins." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06062008-170201/.
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Habibi, Saeid. "Wireless charging of electric vehicles based on resonant inductive power transformers." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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Abstract
Electric vehicles and their charging stations are among important applications in today's world. The E-mobility industry is changing day-to-day with new ways to reduce charging time of electric vehicles, ease of use in charging process, increasing the efficiency and sometimes remote control access of the charging system.
To accomplish this, resonant inductive power transfers is one of the method that can be hired to transfer power to electric vehicles (EVs) over an air-gap and can remarkably improve the range, safety and convenience of the EV battery charging. However, implementation of a large scale wireless charging infrastructure of electric vehicles (e.g. for taxi fleet in a city) is still one of the major difficulties of such technology. Issues related to determining the physical sizes of the coil pads, standardization, technical interoperability, safety and designing the appropriate wireless charging system to be used for different EVs are among those difficulties.
The important target of doing this study is to understand the feasibility of installation of wireless charging stations for electric vehicle in terms of technical and financial issues, and understanding that which size of chargers are needed to install for electric vehicles. Electrical synchronization and interoperability of primary and secondary coils are other issues investigated. In the following chapters, financial and economic analysis of implementation of the wireless charging infrastructure for the taxi and van fleet in an urban area are discussed.
It can be concluded that implementation of wireless charging infrastructure for electric vehicles in urban areas for taxi fleet and delivery van drivers could bring many advantages because of specific working routine and stop time that they have during each working day. Increment of anxiety range, and reduction of charging time, convenience, being needless of tedious conventional charging cables, saving money are major advantages.
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Soares, Jaqueline dos Santos. "O acoplamento indutivo com bobinas On-Chip." Universidade Federal de Viçosa, 2007. http://locus.ufv.br/handle/123456789/4268.
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Previous issue date: 2007-02-26<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The quantum Hall effect (QHE) remains the target of an immense research effort twenty six years after its discovery. In fact this phenomenon has been a source of fundamental questions. Among the open problems in the field is the spatial distribution of the electric current in the quantum Hall effect. This question has been in debate since its discovery. Some experimental and theoretical results indicate the Hall current is distributed uniformly across the width of a Hall bar. Contradictorily, other results suggest the current flows mostly in a narrow region along the device s edges. Prominent works by Yahel et al. [PRL 76, 2149 (1996) and PRL 81, 5201 (1998)] shed new lights on the subject by using an experimental technique that came to known as inductive coupling . This method is based on the measurement of the nanovoltage signal induced by an alternating Hall current in a compact coil, carefully positioned above one edge of a Hall bar. It is perhaps the least invasive method available to study the current distribution in the QHE. It remained nonetheless a challenging experiment, as regards the positioning and making of the coil and the measurement of the minute induced voltage. We showed with calculations that it is possible to greatly simplify the aforementioned technique and make it more sensitive and useful by fabricating the coil on the chip containing the Hall bar. The concept was tested experimentally replacing the semiconductor Hall bar with a metal strip whose current distribution is known to be uniform from the electrodynamics. The voltage induced by the current in the metal strip in a nearby coil fits was measured. It fits in precisely, in magnitude and phase, with the values calculated. As our most important contribution, we found out that the presence of a two dimensional electron gas (2DEG), located 200 nm underneath the coil, increases the induced signal by thirty times. The magnitude and phase of the signal indicate it comes mostly from the current induced in the 2DEG by the alternating Hall current. This amplification effect renders a stronger signal with a sample containing a milimetric size Hall bar and a coil with ten turns, conveniently fabricated by simple optical lithography, than the signal measured by Yahel, using a ten times larger Hall bar and a handcrafted coil with 3,000 turns. We speculate that the effect of the 2DEG shall allow the use of our technique to map the current distribution in the QHE and also to study nanoscopic magnetic systems.<br>O efeito Hall quântico (EHQ) permanece como foco de um imenso esforço de pesquisa vinte e seis anos após sua descoberta. De fato este fenômeno tem levantado uma série de questões fundamentais. Entre os problemas em aberto nesse campo está a distribuição espacial de corrente elétrica durante o efeito Hall quântico. Esta questão tem sido continuamente debatida desde a sua descoberta. Alguns experimentos e modelos teóricos indicam que a corrente se distribui uniformemente pela largura da ponte Hall. Contraditoriamente, outros resultados sugerem que a corrente flui predominantemente nas bordas do dispositivo. Trabalhos importantes de Yahel et al. [PRL 76, 2149 (1996) e PRL 81, 5201 (1998)] trouxeram novas pistas sobre o assunto usando a técnica experimental que ficou conhecida como "acoplamento indutivo . O método é baseado na medida da tensão induzida (da ordem de dezenas de nanovolts) por uma corrente Hall alternada em uma bobina compacta, cuidadosamente posicionada acima de uma das bordas da ponte Hall. Ele é talvez o método menos invasivo disponível para estudar a distribuição de corrente no EHQ. Entretanto, trata-se de uma técnica experimentalmente desafiadora no que se refere ao posicionamento e a fabricação da bobina e a medida tênue da tensão induzida. Mostramos com cálculos que é possível simplificar grandemente a técnica mencionada e fazê-la mais sensível e útil fabricando a bobina no mesmo chip da ponte Hall. O conceito foi testado experimentalmente substituindo a ponte Hall semicondutora por uma tira metálica cuja distribuição de corrente é conhecida a priori da eletrodinâmica. Medimos a tensão induzida pela corrente na tira metálica na bobina vizinha. O resultado ajusta-se perfeitamente, em magnitude e fase, aos valores calculados. Como nossa contribuição mais importante, descobrimos que a presença de uma gás bidimensional de elétrons (2DEG), localizado a 200 nm abaixo da bobina, aumenta o sinal induzido por um fator de trinta. A magnitude e a fase do sinal indicam que ele tem origem na corrente induzida no 2DEG pela corrente Hall alternada. O efeito de amplificação fornece um sinal mais forte em uma amostra contendo uma ponte Hall com dimensão milimétrica e com uma bobina com dez voltas, convenientemente fabricada por litografia óptica, do que o sinal medido por Yahel, usando uma ponte Hall dez vezes maior e uma bobina manufaturada com 3000 voltas. Especulamos que o efeito do 2DEG poderá permitir que a nossa técnica seja usada para mapear a distribuição de corrente no EHQ e também no estudo de sistemas magnéticos com dimensões nanométricas.
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Cregut, Corinne. "Modélisation théorique et consolidation expérimentale des interconnexions en technologie silicium avancée." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10142.
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Depuis les debuts de la micro-electronique, nous assistons a une formidable augmentation des densites d'integration et de la vitesse de fonctionnement des circuits. Cependant, cette course a l'integration se heurte aujourd'hui au probleme des interconnexions : elles sont les principales responsables du retard et de la degradation de l'integrite du signal dans les circuits. Les interconnexions sont devenues un des points bloquant a l'amelioration des performances des circuits et leur modelisation, en vue de les optimiser, est necessaire. Dans ce but, nous avons tout d'abord evalue les principaux outils de simulation des interconnexions disponibles sur le marche. Nous avons ensuite mene une analyse electromagnetique du probleme integrant les specificites des technologies silicium avancees (0. 18m et en deca). Plus particulierement, nous avons analyse les aspects inductifs et precise les contraintes de leur prise en compte dans la modelisation des interconnexions a partir de ces considerations theoriques nous avons defini et realise des motifs de test specifiques representatifs de configurations circuits. La caracterisation et la modelisation de ces dispositifs, nous ont permis de valider nos hypotheses. Nous avons ainsi developpe une methodologie de modelisation et de caracterisation des phenomenes parasites. Nous avons de plus propose et mis en place une procedure d'extraction directe des grandeurs electriques de lignes dans un environnement comportant plusieurs niveaux metalliques. Par ce travail, nous avons apporte des elements de comprehension et de reponse au probleme complexe des interconnexions des circuits integres.
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Massoud, Yehia Mahmoud 1968. "Simulation algorithms for inductive effects." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80593.
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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.<br>Includes bibliographical references (p. 105-110).<br>by Yehia Mahmoud Massoud.<br>Ph.D.
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Чумак, Вадим Олександрович, та Vadum Chumak. "Розробка технології наплавлення тарілок клапанів двигунів внутрішнього згоряння з використанням струмів високої частоти". Master's thesis, ТНТУ ім.І. Пулюя м.Тернопіль Україна, 2019. http://elartu.tntu.edu.ua/handle/lib/30496.
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Чумак В.О. Розробка технології наплавлення тарілок клапанів двигунів внутрішнього згоряння з використанням струмів високої частоти. – Рукопис.
Дипломна робота магістра на здобуття освітнього ступеня «магістр» за спеціальністю 131 «Прикладна механіка» – Тернопільський національний технічний університет імені Івана Пулюя, м. Тернопіль, 2019.
Дипломна робота присвячена розробленню технології індукційного наплавлення тарілок клапанів ДВЗ з використанням струмів високої частоти.
В роботі проведено аналітичні дослідження та запропоновано рекомендації щодо застосування технології індукційного наплавлення способом наморожування тарілок клапанів. Застосування даного способу наплавлення дозволило покращити якість наплавленого шару та підвищити ефективність виробництва.
Запропоновано раціональне наплавлювальне обладнання та вдосконалено технологічне оснащення, що дозволять покращити техніко-економічні показники виробництва.
Впровадження запропонованої технології у виробництво дозволить досягнути значних економічних показників.
Chumak V.O. Development of induction melting procedure of internal combustion engines valve plates using high frequency current . - The manuscript.
Master's thesis for the degree of master's degree in specialty 131 "Applied Mechanics" - Ternopil Ivan Pulyuy National Technical University, Ternopil, 2019.
The thesis is devoted to the development of technology of induction surfacing of plates of ICE valves using high frequency currents.
Analytical researches are carried out in this work and recommendations on application of technology of induction surfacing by way of freezing of plates of valves are offered. The use of this method of surfacing has allowed to improve the quality of the deposited layer and to increase production efficiency.
Rational surfacing equipment and technological equipment have been proposed to improve technical and economic performance.
The introduction of the proposed technology into production will achieve significant economic performance.<br>ВСТУП 7
1. АНАЛІТИЧНА ЧАСТИНА 8
1.1. Опис конструкції виробу та умов його роботи 8
1.2. Технологічні особливості наплавлення клапанів ДВЗ 11
1.3. Техніко-технологічні особливості процесу наплавлення клапанів ДВЗ способом наморожування 20
2. ДОСЛІДНИЦЬКА ЧАСТИНА 23
2.1 Дослідження взаємодії клапанних сталей з жаростійкими наплавлювальними сплавами в різних середовищах 23
2.2 Дослідження впливу вмісту кисню в газових сумішах на формування наплавлювального шару 31
3 ТЕХНОЛОГІЧНА ЧАСТИНА 39
3.1 Аналіз технології процесу наплавлення 39
3.2 Оптимізація режиму наплавлення 42
4 КОНСТРУКТОРСЬКА ЧАСТИНА 46
4.1 Вибір загальної функціональної семи наплавлю вальних установок 46
4.2 Розробка пристроїв для автоматичної орієнтації, складання і завантаження заготовки клапану і кільця 48
5 ОБГРУНТУВАННЯ ЕКОНОМІЧНОЇ ЕФЕКТИВНОСТІ 61
5.1 Вихідні дані 61
5.2 Організаційна частина 61
5.3 Економічна частина 67
6 СПЕЦІАЛЬНА ЧАСТИНА 79
7 ОХОРОНА ПРАЦІ ТА БЕЗПЕКА В НАДЗВИЧАЙНИХ СИТУАЦІЯХ 86
7.1 Розрахунок штучного освітлення для спроектованого цеху з використанням люмінесцентних чи ламп розжарювання 86
7.2 Заходи пожежної безпеки при експлуатації спроектованої дільниці 87
7.3. Дія електричного струму на організм людини 89
8 ЕКОЛОГІЯ 94
8.1 Актуальність охорони навколишнього середовища 94
8.2 Заходи по зменшенню шкідливих викидів в навколишнє середовище 95
ВИСНОВКИ 98
ПЕРЕЛІК ПОСИЛАНЬ 99
ДОДАТКИ 101
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Marchant, David. "Induced polarization effects in inductive source electromagnetic data." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/52685.
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Induced polarization (IP) surveys are commonly conducted to map the distribution of electrical chargeability, a diagnostic physical property in mineral exploration and in many environmental problems. Although these surveys have been successful in the past, the galvanic sources required make their application labour intensive and prevents them from being applied in some settings. The ability to detect chargeability with a geophysical technique that employs inductive sources, eliminating the need to inject current into the ground, would provide a valuable tool to applied geophysicists.
In this work, two aspects of inductive source induced polarization are examined. First, a new methodology for processing inductive source frequency domain EM data to identify IP effects is presented. The method makes use of the asymptotic behaviour of the secondary magnetic fields at low frequency. A new quantity, referred to as the ISIP datum, is defined so that it equals zero at low frequencies for any frequency-independent (non-chargeable) conductivity distribution. Thus, any non-zero response in the ISIP data indicates the presence of chargeable material. Numerical simulations demonstrate that the method can be applied even in complicated geological situations. A 3D inversion algorithm is developed to recover the chargeability from the ISIP data and the inversion is demonstrated on synthetic examples.
Understanding the impacts of IP effects on time-domain electromagnetic data requires the ability to simulate common survey techniques while taking chargeability into account. Most existing techniques preform this modelling in the frequency domain prior to transforming their results to the time domain. Application of those techniques on three dimensional problems can be computationally limiting. In the second part of this thesis, three new techniques for forward modelling the time-domain electromagnetic response of chargeable materials directly in the time domain are developed. The first considers the convolution in the time domain directly, while the others use auxiliary differential equations to analytically transform the governing equations into the time domain. The resulting methods are verified by comparing their results with analytic solutions. The potential application of the method was demonstrated by modelling the occurrence of negative transients in airborne time-domain electromagnetic data.<br>Science, Faculty of<br>Earth, Ocean and Atmospheric Sciences, Department of<br>Graduate
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Poon, Andrew. "Reducing inductive effects in radio frequency integrated circuits /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
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Pétrélis, François. "Effet dynamo : étude des mécanismes d'instabilité et de saturation du champ magnétique." Paris 6, 2002. https://tel.archives-ouvertes.fr/tel-00003842.
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Kennewell, Kimberly. "Surface and interface anisotropies measured using inductive magnetometry." University of Western Australia. School of Physics, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0243.
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In this thesis, an inductive ferromagnetic resonance (FMR) technique is developed to measure the magnetisation dynamics in thin films across a wide range of frequencies and fields. In particular, this project concentrates on measuring higher order exchange dominated modes to observe surface and interface effects in bilayer films. The experimental technique was first developed as a time domain technique, utilising a fast rise time (~50 ps) step pulse to disturb the equilibrium position of the magnetisation. The subsequent precessional damped decay was measured at different applied fields to observe the resonant modes. The data is Fourier transformed to extract a frequency dependent susceptiblity, and results are presented for the frequency and linewidth dependence of excitations of a permalloy film as a function of applied field. This technique is limited to a frequency range dictated by the rise time of the pulse. The technique was then extended so as to use a continuous wave perturbation, utilising a network analyser as both the excitation source and the measurement device. The scattered wave parameters of both the transmission and reflection from the sample were measured, and a magnetic susceptibility is extracted. This method has a frequency range which is dictated by the bandwidth of the network analyser and the microwave circuit. In this project, results are presented for frequencies up to 15 GHz. The signal to noise ratio was also found to be lower than the pulsed technique. Fundamental resonant mode studies are presented for a Fe/MnPd exchange bias bilayer film. Crystalline and exchange anisotropies are extracted from angular measurements, and the behaviour of the magnetisation is investigated during its reorientation to a hard axis direction. Information about the distribution of the local exchange field strength and direction is predicted. Fundamental mode studies are also presented for a Py/Co exchange spring bilayer film. Two modes are observed, approximating an optical and acoustical excitation. Film systems were also designed with suitable thicknesses to observe in the experimentally available frequency range non-uniform exchange dominated excitations through the thickness of the film. The broadband nature of the experiment allowed the frequency of the modes to be measured as a function of field. Results from a single permalloy layer showed two observable modes, the fundamental and the first exchange mode. Measurements were also taken of bilayer films where permalloy is coupled to cobalt. In this system the effect of the cobalt is seen to shift the single layer Py mode frequencies, as well as introduce new modes. The relative intensities of the modes also change with the addition of cobalt. Results are shown for a Pt/Co multilayer coupled to a permalloy layer through a Cu spacer of varying thickness. The observation of excitations through the thickness of the film motivated the development of a suitable theory. A system of integro-differential equations were derived which account for dipole and exchange coupling in the film as well as the field screening by the metal of the coplanar line. The conductivity of the sample and the finite wavevector excitation of the stripline are also included. Numerical solution of the equations results in a spectrum of acoustical, optical and higher-order modes. Fitting of the model to the experimental results allowed extraction of the film parameters including; the exchange constants in the film; the surface pinning from any surface layer anisotropy; as well as the interlayer exchange coupling across the interface.
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Snyder, Thomas D. "The effects of variability on damage identification with inductive learning." Thesis, Virginia Tech, 1994. http://hdl.handle.net/10919/42160.
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This work discusses the effects of inherent variabilities on the damage identification problem. The goal of damage identification is to detect structural damage before it reaches a level which will detrimentally affect the structure’s performance. Inductive learning is one tool which has been proposed as an effective method to perform damage identification.
There are many variabilities which are inherent in damage identification and can cause problems when attempting to detect damage. Temperature fluctuation and manufacturing variability are specifically addressed. Temperature is shown to be a cause-effect variability which has a measurable effect on the damage identification problem. The inductive learning method is altered to accommodate temperature and shown experimentally to be effective in identifying added mass damage at several locations on an aluminum plate.
Manufacturing variability is shown to be a non-quantifiable variability. The inductive learning method is shown to be able to accommodate this variability through careful examination of statistical significances in dynamic response data. The method is experimentally shown to be effective in detecting hole damage in randomly selected aluminum plates from a manufactured batch.<br>Master of Science
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Chong, Florenca. "Effects of mood induction on reasoning." Thesis, University of Macau, 2012. http://umaclib3.umac.mo/record=b2588829.
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Samson, Deborah Christine Veronica. "The effect of mood induction on fear reduction." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26912.
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The present research examined the relationship between mood and fear. A musical mood induction technique was utilized to induced either a happy mood or a sad mood in eighty-four female university students fearful of spiders or snakes. Following mood induction, subjects underwent in vivo systematic desensitization to reduce their fear. Fear levels were reassessed four weeks later and those subjects who showed a return of fear underwent a second session of exposure therapy. Measures of subjective fear and self-efficacy were taken before and after mood induction and again after fear reduction. The length of time taken to reduce fear was also recorded. The findings showed that an induced sad mood led to greater subjective fear and lower self-efficacy compared with an induced happy mood. In addition, an induced sad mood during fear reduction was associated with greater return of fear four weeks later. No difference was found in the length of time taken to reduce fear for happy and sad subjects.
This study also addressed the issue of mood state dependency of fear reduction. It was hypothesized that subjects who underwent their second session of fear reduction while in a mood state congruent with that of their first session would show more rapid habituation than those in an incongruent mood state. The results did not support this hypothesis.
If the findings of this investigation prove generalizable to clinical depression, they suggest that the most effective approach in treating individuals who are both clinically depressed and anxious may be to treat the depression before beginning exposure to fearful situations or stimuli.<br>Arts, Faculty of<br>Psychology, Department of<br>Graduate
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Dumont, Elise. "Utilisation de charges nucléaires fictives pour l'étude des effets électroniques de substituants : la méthode H* : application pour l'étude des effets inductifs purs et pour la comparaison des effets inductifs et mésomères sur des grandeurs spectroscopiques ou de réactivité." Paris 6, 2006. http://www.theses.fr/2006PA066110.
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Chow, Chun-kin, and 周俊健. "Suppressor of cytokine signaling (SOCS 3) induction in SARS coronavirus infected cells." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B42925150.
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MacKendrick, Alex. "Interleaved Effects in Inductive Category Learning: The Role of Memory Retention." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5846.
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Interleaved effects are widely documented. Research demonstrates that interleaved presentation orders, as opposed to blocked orders typically benefit inductive category learning. What drives interleaved effects is less straightforward. Interleaved presentations provide both the opportunity to compare and contrast between different types of category exemplars, which are temporally juxtaposed, and the opportunity to space study of the same type of category exemplars, which are temporally separated within the presentation span. Accordingly, interleaved effects might be driven by enhanced discrimination, enhanced memory retention, or both in some measure. Though recent studies have largely endorsed enhanced discrimination as the critical mechanism driving interleaved effects, there is no strong evidence to controvert the contribution of enhanced memory retention for interleaved effects. I further examined the role of memory retention by manipulating both presentation order and category structure. Across two experiments I found that memory retention may drive interleaved effects in categorization tasks.
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Le, Sueur Catherine Ruth. "Induction effects in Van der Waals complexes." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385523.
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Vowles, Kevin E. "Order effects of fear and pain induction." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2198.
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Thesis (M.A.)--West Virginia University, 2001.<br>Title from document title page. Document formatted into pages; contains ix, 76 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 32-39).
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OBERTI, CHIARA. "Induction effects of torus knots and unknots." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/87792.
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In questa tesi si analizzano gli effetti di induzione di un campo sorgente stazionario nella forma di un filamento a nodo o non-nodo torico. Studi simili sono stati compiuti per geometrie rettilinee, circolari o elicoidali, ma poco o nulla è noto per geometrie e topologie più complesse. I nodi torici sono un raro esempio di curve spaziali chiuse con topologia non banale che ammettono una descrizione matematicamente semplice; per questo rappresentano un interessante caso da studiare. Inoltre, poiché i nodi torici sono anche un buon modello matematico per studiare strutture di campo intrecciate, questo lavoro offre utili informazioni per svariate applicazioni possibili, dalle scienze fisiche (fisica del sole e astrofisica, dinamica vorticosa, fisica della fusione) alla tecnologia (telecomunicazioni, progettazione di nuovi materiali, analisi di dati). Il lavoro è organizzato in 4 capitoli.
Nel capitolo 1 presentiamo uno studio esaustivo di proprietà geometriche e topologiche dei nodi/non-nodi torici. Usando una parametrizzazione standard, dimostriamo l'esistenza e determiniamo la posizione di punti di flesso per una data configurazione critica, e prescriviamo la condizione per rimuovere la singolarità associata alla torsione nel punto di flesso. Mostriamo che in prima approssimazione la lunghezza cresce linearmente con il numero di avvolgimenti ed è proporzionale al numero minimo di incroci. Prendendo il numero di avvolgimento, definito come rapporto tra gli avvolgimenti meridiani e quelli longitudinali, come misura di complessità topologica, ne analizziamo l'influenza su varie proprietà globali, quali lunghezza, curvatura, torsione totale e distorsione.
Nel capitolo 2 analizziamo l'influenza del numero di avvolgimento e di altre proprietà geometriche su induzione, energia ed elicità. Per far questo si assume che il filamento fisico abbia sezione trasversale infinitesima e si usa la legge di Biot-Savart adattata alla particolare parametrizzazione scelta. Si studiano le linee di campo indotto per numerosi nodi/non-nodi torici su vari piani trasversali. Si mostra che l'intensità del campo indotto dipende linearmente dal numero di avvolgimenti longitudinali. Si forniscono maggiorazioni e minorazioni per l'energia e una stima dell'elicità in termini del numero di distorsione.
Nel capitolo 3 compariamo i contributi d'induzione locali e globali in relazione al numero di avvolgimento, derivando espansioni asintotiche della funzione integranda. Mostriamo che i termini locali di ordine principale in generale non sono sufficienti a fornire accurate informazioni globali; tuttavia, mostriamo che per alcuni valori del numero di avvolgimento i comportamenti locali e globali sono in buon accordo.
Nel capitolo 4 analizziamo gli effetti del numero di avvolgimento sull'auto-induzione per punti asintoticamente vicini al campo sorgente. Poiché al limite l'integrale di Biot-Savart diventa singolare, lo regolarizziamo applicando la prescrizione analitica di Moore e Saffman (1972). Mentre al primo ordine l'auto-induzione è proporzionale alla curvatura locale, determiniamo l'influenza del numero di avvolgimento sui termini successivi, mostrando che i suoi effetti sono comparabili con quelli dati da una distribuzione di campo sorgente sulla sezione trasversale finita del filamento.<br>The induction effects due to a steady source field in the shape of a torus knot or unknot filament are analysed in detail. Similar studies for rectilinear, circular or helical geometries have been done in the past, but very little is known for more complex geometries and topologies. Torus knots provide a rare example of closed, space curves of non-trivial topology, that admit a mathematically simple description; for this reason they represent an interesting case study to consider. Moreover, since torus knots are also a good mathematical model for studying braided field line structures, the present work provides useful information for a wide range of possible applications, from physical sciences (solar physics and astrophysics, vortex dynamics, fusion physics) to technology (telecommunication, new materials design, data analysis). The work is organized in 4 chapters.
In chapter 1 we present a comprehensive study of geometric and topological properties of torus knots and unknots. By using a standard parametrization, we demonstrate the existence, and determine the location, of inection points for a given critical configuration, and prescribe the condition for removing the singularity associated with torsion at the inflection point. We show that, to first approximation, total length grows linearly with the number of coils, and it is proportional to the minimum crossing number of the knot type. By taking the winding number, given by the ratio between meridian and longitudinal wraps, as measure of topological complexity of the knot, we analyse its influence on several global quantities, such as total length, curvature, torsion and writhe. In chapter 2 we analyse the influence of the winding number and other geometric properties on induction, energy and helicity. This is done by assuming the physical filament of infinitesimally small cross-section and by using the Biot-Savart law adapted for the particular parametrization chosen. Field line patterns of the induced field are obtained for a large family of knots/unknots on several cross-sectional planes. The intensity of the induced field is shown to depend linearly on the number of toroidal coils. We provide bounds on energy, and an estimate of helicity in terms of writhe.
In chapter 3 we compare local and global induction contributions in relation to the winding number, by providing asymptotic expansions of the integrand function.
We show that in general local leading order terms are not sufficient to provide accurate global information; nevertheless, for some values of the winding number local and global behaviours are found to be in good agreement.
In chapter 4 we investigate the influence of the winding number on the binormal component of the self-induction a point asymptotically near to the source field. Since in the limit the Biot-Savart integral becomes singular, we apply the analytical prescription of Moore and Saffman (1972) to regularize it. While to leading
order the self-induction is proportional to local curvature, we derive an integral formula for next terms, including higher order local terms together with non-local terms, and we study its dependence on the winding number by showing that the dominant contribution is generally given by non-local terms.
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Verhille, Gautier. "Etudes expérimentales en magnétohydrodynamique : effet dynamo, turbulence et induction." Lyon, Ecole normale supérieure, 2010. http://www.theses.fr/2010ENSL0582.
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Ce manuscrit est consacré à l'étude de trois aspects de la magnétohydrodynamique : l'effet dynamo, l'influence d'un écoulement turbulent de métal liquide sur un champ magnétique et l'influence d'un champ magnétique fort sur un écoulement turbulent de métal liquide. Des expériences en gallium à l'ENS-Lyon, et des expériences en sodium à Cadarache, au sein de la collaboration VKS (von Karman sodium), on été menées. Une partie est consacrée à l'importance des conditions aux limites pour les processus d'induction et les mécanismes dynamo, tels que révélés par l'expérience VKS. Nous présentons les résultats obtenus en modifiant la conductivité électrique et la perméabilité magnétique des disques dans l'expérience VKG (von Kármán gallium), à bas Rm. Ils mettent en évidence l'importance d'effets d'inductions forts au voisinage de disques en fer. De même, pour comprendre le lien entre la dynamique chaotique du champ dynamo dans l'expérience VKS et celle de l'écoulement turbulent, nous avons mis en place une expérience dynamo semi-homogène avec un effet ω turbulent et un bouclage artificiel. Le champ engendré par cette expérience présente une intermittence de type on-off pilotée par les grandes échelles de l'écoulement. Cette dynamique est alors analogue à celle d'un système avec bruit multiplicatif et bruit additif. Lors de la saturation du champ dynamo, la force de Laplace est suffisamment forte pour modifier l'écoulement et stopper la croissance du champ. Afin d'étudier ce phénomène, nous avons développé deux types de sonde pour mesurer des vitesses dans des métaux liquides. Nous montrons aussi par des mesures locales et globales comment un champ magnétique fort modifie la structure et la dynamique des écoulement tourbillonnaires de von Karman<br>This PhD work concentrates on three issues of magnetohydrodynamics : the dynamo effect, magnetic in- duction from flow motions and flow modifications from large applied magnetic fields. Experiments are run using von Karman flows, either in Lyon with gallium as the working fluid or Cadarache using liquid sodium, in the framework of the VKS dynamo collaborations. One issue concerns the effect of boundary conditions on induction, as evidenced by the VKS experiment for which dynamo generation has only been observed when at least on rotating driving impeller is made of soft iron. In the gallium flow, measurements made with driving impellers made with materials of variable electrical conductivity and magnetic permeability show that strong induction effects are generated in the vicinity of the iron impeller(s). Another issue concerns the link between the chaotic behavior of the magnetic field and the dynamic of the hydrodynamics flow. We build a semi-homogeneous dynamo with a turbulent ω-effect and an artificial α-effect. In this experiment, dynamo reversals are observed, with the characteristics of on-off intermittency, governed by the large scale fluctuation of the flow. This dynamics can be modeled by a system with additive and multiplicative noise. As the dynamo saturates to its equilibrium value, Lorentz forces modify the the flow. In order to study this mechanism, we have build two kinds of velocity probes which can operate in liquid metals. Using global power measurements, we also show how a large magnetic field modify the structure and the dynamics of the von Karman swirling flows
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Amrhein, Andrew Aloysius. "Induction Heating of Aluminum Cookware." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/77400.
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Induction heating has become a popular alternative to other heat sources for stovetop cooking applications due to performance, efficiency, control response, and safety. The main drawback is that extreme difficulty is encountered when trying to head low-resistivity, non-ferromagnetic metals such as aluminum and copper, which are commonly used for cookware in several societies. The lack of ferromagnetic properties, resulting in no hysteresis dissipation, and low resistivity of such metals results in an impractically low resistance reflected through the work coil. The resultant impedance complicates inverter design, as it is too low to be efficiently driven with conventional inverter topologies. The magnitudes of current involved in exciting this impedance also severely impact the efficiency of the coil and resonant components, requiring extreme care in coil design. This work explores various techniques that have been proposed and/or applied to efficiently heat low-resistivity cookware and the associated limitations. A transformer-coupled series-load-resonant topology driven by a full-bridge inverter is proposed as a means of efficiently heating aluminum cookware within practical design constraints. The experimental circuit is built and successfully tested at an output power of 1.66kW. The procedure of optimizing the work coil for improved efficiency is also presented along with the procedure of measuring coil efficiency. An improved circuit incorporating switch voltage detection to guarantee zero-voltage switching is then built in order to overcome limitations of this design.<br>Master of Science
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Macedone, Jeffrey Harris. "Ion transmission studies in the first vacuum stage of an inductively coupled plasma mass spectrometer /." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd785.pdf.
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Parlayan, Filiz Eanes Ritchie. "Development of inductively coupled plasma spectroscopic methods for the determination of metals in beluga (delphinapterus leucas) and pygmy sperm (kogia breviceps) whale liver samples/." [s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/kimya/t000399.pdf.
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Thesis (Master)--İzmir Institute of Technology, İzmir, 2005<br>Keywords: ICP-OES, Chemometrics methods, internal standardization, matrix effects. Includes bibliographical references (leaves. 111-120).
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Siau, Jonathan. "Unstructured PEEC formulations considering resistive, inductive and capacitive effects for power electronics." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT120/document.
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La méthode PEEC classique repose sur une méthode intégrale semi-analytique pour permettre la détermination d'un schéma électrique équivalent à l'aide de constantes localisées. Cette méthode est particulièrement bien adaptée pour la modélisation de régions conductrices du type filaire. S'il est possible actuellement de prendre en compte dans cette méthode des régions minces conductrices, cette approche demeure limitée et insatisfaisante. En effet, des contraintes très fortes pèsent sur les maillages qu'il est possible de traiter (discrétisation des géométries en quadrangles) et l'approche est limitée en fréquence (pas d'effet capacitif). L'objectif de cette thèse est d'introduire les effets capacitifs mais aussi magnétiques dans la méthode PEEC afin d'accéder à un outil général, performant et utilisable au niveau industriel. En particulier, la généralité de la formulation et sa flexibilité devrait permettre une utilisation simple à l'utilisateur du logiciel InCa3D non expert en méthode numérique. Le travail consistera donc à : • Consolider les travaux précédents par l'élargissement de l'approche, notamment en introduisant les effets capacitifs et magnétiques dans les formulations. • Proposer des méthodes de compressions matricielles adaptées pour limiter les temps de calcul et sauvegarder de la mémoire<br>The classical method PEEC is based on a semi-analytical integral method to construct an equivalent electric circuit using lumped components. This method is particularly well-suited to modelise filiform conductors. It is actually possible to consider thin conductive regions with this method, but it's still limited and unsatisfactory. In fact, the meshes that can be used are very constrained (geometrically discretized by quadrangles) and the frequency approach is limited (capacitive effect is neglected). The aim of this thesis is to introduce the capacitive and magnetic effects into the method PEEC to get a general tool, efficient and usable at the industry level. Particularly, the generality of the formulation and its flexibility should enable a simple use of the software InCad3D for non-expert user on numerical methods. The work consists in : • Improving the last works by introducing the capacitive and magnetic effects in the formulations. • Suggesting some methods of matricial compression to improve the efficiency of the computation, and to lower the needed memory
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Bora, Selin. "Boron Determination In Body Fluids By Inductively Coupled Plasma Optical Emission Spectrometry And Inductively Coupled Plasma Mass Spectrometry." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12611499/index.pdf.
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Boron element plays an important role for our country since approximately 70% of the world&rsquo<br>s reserves are in Turkey. It is widely used in different areas of industry. Besides being vital for the plants, it is important also for human health. It has been shown that high boron exposure does not affect fertility negatively and also with an increasing boron exposure, risk of prostate and cervical cancers decreases. There are different opinions regarding health effects of boron. There are both positive and negative findings. Therefore, determination of boron in body fluids such as urine and blood is necessary to monitor exposed concentration level and its relation with diseases. Furthermore, these studies may contribute to define a reference value for safe maximum daily boron intake.
In this study, a method previously developed by our research group was applied for the determination of boron in urine samples. Urine and blood samples were collected from human subjects living or working in different regions of Balikesir where boron reserves are located. While urine analysis was done by using Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES), due to lower concentrations of boron in blood, Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was used for blood analysis. A sensitive method was developed using ICP-MS.
Samples were digested in microwave oven by applying optimized digestion procedures. Indium (In) and Beryllium (Be) internal standards were spiked into the urine and blood samples, respectively. A sample introduction system containing no glass or silica surfaces was used in ICP-MS to eliminate boron memory effect. Two isotopes of the boron, 10B and 11B, were monitored during the study. Space charge effect due to Na+ ion and carbon interference on B and Be signals was investigated in detail. Limit of Detection was 0.021 mg/L for ICP-OES and it was 2.2 µ<br>g/L for ICP-MS. The accuracies of the methods were checked by using NIST 1573a Tomato Leaves and BCR Human Hair certified reference materials for urine and blood, respectively.
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Choi, Jihoon. "Nanofils de SiC : de la croissance aux dispositifs associés." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-01061784.
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Les nanostructures de semi-conducteurs de faibles dimensions (comme les nanofils(NFs)) sont devenues l'objet de recherches intensives pour explorer de nouveaux phénomènes émergents à l'échelle nanométrique et sonder leur possibilités d' utilisation dans l'électronique du futur. Parmi les différents nanofils semi-conducteurs, SiC a des propriétés très particulières, comme une large bande interdite, une excellente conductivité thermique, un haut champ électrique de claquage, une stabilité chimique et physique, une haute mobilité des électrons et une haute biocompatibilité.Nous proposons dans cette étude ; d'examiner une nouvelle approche pour fabriquer des nanostructures de SiC par l'approche " top-down ". Cela permet l'élaboration de nanostructures cristallines de SiC de haute qualité monocristalline avec un niveau de dopage contrôlé. Le comportement de nanostructures de SiC gravées a également été étudié en fonction de polytypes et des orientations cristallographiques.Nous avons également étudié les trois principaux sujets de SiC nano-devices pour atteindre une excellente performance. Pour répondre à ces questions, deux types de SiC nanoFET (SiC NFFET et SiC NPFET) ont été fabriqués et caractérisés par l'utilisation de nanofils de SiC et de nanopiliers de SiC préparés respectivement par les méthodes " bottom-up " et " top-down ".
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WEBB, BRYAN DOUGLAS. "FUNDAMENTAL INVESTIGATIONS OF A 148 MEGAHERTZ INDUCTIVELY COUPLED PLASMA DISCHARGE." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188138.
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Fundamental investigations have been carried out on an Inductively Coupled Plasma (ICP) operated at 148 MHz, a frequency which is nearly three times higher than any previously reported for analytical ICPs used in spectrochemical analysis. High frequency operation is expected to provide easier sample introduction into the discharge, with a consequence of less energetic conditions in the central channel. Several plasma diagnostic techniques were employed in order to determine the conditions experienced by the analyte species in this source for spectrochemical analysis. Three different torch systems were investigated at 148 MHz and compared to the "standard" 27 MHz configuration. The highest excitation temperatures and electron densities were obtained in the 27 MHz configuration, and the lowest values in the largest torch at 148 MHz. Intermediate values were obtained in the intermediate-size torches at 148 MHz. These observations correlate reasonably well with the ratio of the plasma radius to the skin depth (r/s). The skin depth defines the region in which the majority of the electrical energy is deposited into the discharge, and is smaller at 148 MHz than at 27 MHz. The measurement of electron densities also allows the estimation of how closely a particular discharge approaches Local Thermal Equilibrium (LTE). As may be expected, LTE is most closely approached in the 27 MHz arrangement. The less energetic conditions characterized by lower temperatures and electron densities result in less intense analyte emission from the high frequency ICPs. Signal-to-Background ratios and detection limits reflect this trend, but the linearity of the calibration curves and freedom from vaporization interferences are not degraded. Finally, the introduction of organic solvents is much easier, and better detection limits in an organic matrix are obtained at 148 MHz. These investigations have shown the utility of classifying the effects of changing torch sizes and operating frequencies by means of the r/s ratio. This provides the analyst with a means of selecting the general range of conditions to be employed in a particular analysis.
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Bassom, A. P. "An inversion method for the geomagnetic induction problem and the stability of some fluid flows at high Reynolds numbers." Thesis, University of Exeter, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379471.
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Newall, D. R. "The effect of vitamin A on the fusion of mouse palate." Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379366.
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侯國寶 and Kwok-po Hau. "The role of calcium in the induction of ornithine decarboxylase by L-asparagine in Reuber H-35 rat hepatoma cells." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B3121079X.
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Thomas, William James. "60 Hz magnetic field exposure inhibits protein Kinase C dependent induction of Neuropeptide Y mRNA in PC-12 cells." CSUSB ScholarWorks, 1994. https://scholarworks.lib.csusb.edu/etd-project/907.
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Pinho, Sónia Andreia de Almeida. "Induction and determination of ROS and their effect on peroxisome dynamics." Master's thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/3160.
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Mestrado em Métodos Biomoleculares<br>Peroxissomas são organelos celulares de membrana simples, os quais têm
importantes funções metabólicas, como por exemplo metabolismo de lípidos e ROS,
sendo assim indispensáveis para a saúde e desenvolvimento humano. Os
peroxissomas são organelos altamente flexíveis e dinâmicos que rapidamente se
agregam, multiplicam e degradam em resposta a necessidades metabólicas. Em
cultura celular, o stress oxidativo e outros estímulos externos (ex. factores de
crescimento, ácidos gordos, despolimerização) têm mostrado induzir processos de
crescimento (alongamento) e divisão de peroxissomas, os quais estão relacionados
com a sua proliferação. Considerando que alguns dos componentes moleculares da
maquinaria de crescimento e divisão têm sido identificados nos últimos anos, as vias
de sinalização e regulação que medeiam a proliferação de peroxissomas são
largamente desconhecidas.
O objectivo desta dissertação de mestrado foi examinar o efeito de diferentes
estímulos externos promotores de ROS na indução do crescimento/proliferação do
compartimento peroxisomal. Foi seleccionado um sistema de cultura de células de
mamífero que apresentam um compartimento peroxisomal dinâmico. Análises
baseadas em fluorescência para a detecção da produção de ROS e alterações nos
níveis de GSH intracelular foram estabelecidos. Estes procedimentos foram usados
primeiro para esclarecer se o alongamento de peroxissomas observado após
despolimerização de microtubulos (pelo nocodazole) é mediado por ROS. O
alongamento de peroxissomas e a despolimerização dos microtubulos após
tratamento com nocodazole foi monitorizado e quantificado por microscopia de
imunofluorescência. O Nocodazole induziu um aumento dos níveis de ROS intracelular
e apesar do pré tratamento com antioxidantes ter baixado os níveis de ROS, não
preveniu o alongamento peroxisomal. Estes resultados demonstram que as alterações
morfológicas do compartimento peroxisomal induzidas pelo nocodazole são
independentes da produção de ROS. Para além disso, foi examinado o efeito de
alterações nos níveis de glutationa (GSH) celular no compartimento peroxisomal.
Interessantemente, a redução dos níveis de GSH intracelular pelo BSO, um inibidor da
enzima γ-glutamylcystein synthetase (γ-GCS), resultou num aumento acentuado de
crescimento/proliferação de peroxissomas. Os níveis de ROS e GSH foram
determinados por análises baseadas em fluorescência. Pré tratamento com
antioxidante preveniu o alongamento de peroxissomas indicando que a alteração no
estado redox celular (citoplasmatico) levou à proliferação de peroxissomas a qual
exerce, supostamente, uma função protectora para a célula. Finalmente, foi
investigado se a inibição da cadeia respiratória mitocondrial e com isso, se ROS
provenientes das mitocondrias foi capaz de induzir crescimento e divisão dos
peroxissomas. Entre os inibidores analisados, apenas a rotenona, inibidor do
complexo I, teve um efeito proeminente na elongação de peroxissomas. Todavia, foi
demontrado que o seu efeito é devido à acção que a rotenona tem na
despolimerização dos microtubulos. Assim, apesar da relação de proximidade entre
mitocondria e peroxissomas, as ROS provenientes das mitocondrias não são prováveis
de induzir alterações no compartimento peroxisomal. Os nossos resultados também
indicam que estudos in vivo usando a rotenona têm de ser interpretados com muito
cuidado. Além disso, os resultados mostram que as ROS podem alterar a dinâmica do
compartimento peroxissomal, mas têm de vir de locais específicos dentro da célula
(por exemplo, do citosol).
ABSTRACT: Peroxisomes are single membrane bound subcellular organelles, which fulfill
important metabolic functions, for example in lipid and ROS metabolism, and are thus
indispensable for human health and development. Peroxisomes are highly flexible
organelles that rapidly assemble, multiply and degrade in response to metabolic
needs. In cultured cells, oxidative stress and other external stimuli (e. g. growth
factors, fatty acids, microtubule depolymerization) have been shown to induce
processes of growth (elongation) and division of peroxisomes, which are related to
peroxisome proliferation. Whereas some of the molecular components of the growth
and division machinery have been identified in the last years, the regulatory and
signaling pathways mediating peroxisome proliferation are largely unknown.
The aim of this master thesis was to examine the effects of different ROS-producing
external stimuli on the induction of growth/proliferation of the peroxisomal
compartment. A suitable mammalian cell culture system with a dynamic peroxisomal
compartment was selected and fluorescent-based assays for the detection of ROS
production and changes in the intracellular GSH levels were established. The setup
was first used to clarify if peroxisome elongation observed after depolymerization of
microtubules (by nocodazole) is mediated by ROS. Peroxisome elongation and
microtubule depolymerization after nocodazole treatment was monitored and
quantified by immunofluorescence microscopy. Although nocodazole induced an
increase in cellular ROS levels, a pre-treatment with antioxidants and lowering of
intracellular ROS levels did not prevent peroxisome elongation. These findings
demonstrate that the morphological changes of the peroxisomal compartment
induced by nocodazole are independent of ROS production. Furthermore, I examined
the effect of changes in the cellular redox state on the peroxisomal compartment.
Interestingly, the reduction of intracellular GSH levels by BSO, an inhibitor of γ-
glutamylcystein synthetase (γ-GCS), resulted in a prominent increase in peroxisomal
growth/elongation. ROS and GSH levels were determined by fluorescent-based
assays. Pre-treatment with antioxidants prevented peroxisome elongation indicating
that changes in the cellular (cytoplasmic) redox state lead to peroxisome proliferation,
which is supposed to have a protective function for the cell. Finally, I investigated
whether inhibition of the mitochondrial respiratory chain and thus, mitochondriaderived
ROS were capable of inducing peroxisomal growth and division. Among the
inhibitors tested, only rotenone, a complex I inhibitor, had a prominent effect on
peroxisome elongation. However, I demonstrated that this effect is due to a
microtubule-depolymerizing activity of rotenone. Thus, despite the close peroxisomemitochondria
relationship, mitochondria-derived ROS are unlikely to induce changes
of the peroxisomal compartment. Our findings also indicate that in vivo studies using
rotenone have to be interpreted with great care. In addition, the results show that
ROS can alter the dynamics of the peroxisomal compartment, but have to come from
specific locations (e.g. the cytosol) within the cell.
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Stalnaker, Jack Lee. "A finite element approach to the 3D CSEM modeling problem and applications to the study of the effect of target interaction andtopography." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/2770.
Full textAbstract:
The solution of the secondary coupled-vector potential formulation of Maxwell??s equations governing the controlled-source electromagnetic (CSEM) response of an arbitrary, threedimensionalconductivitymodelmust be calculatednumerically.The finite elementmethod is attractive, because it allows the model to be discretized into an unstructured mesh, permitting the specification of realistic irregular conductor geometries, and permitting the mesh to be refined locally, where finer resolution is needed. The calculated results for a series ofsimple test problems, ranging from one-dimensionalscalar differentialequations to three-dimensional coupled vector equations match the known analytic solutions well, with error values several orders of magnitude smaller than the calculated values. The electromagnetic fields of a fully three-dimensional CSEM model, recovered from the potentials using the moving least squares interpolation numerical differentiation algorithm, compares well with published numerical modeling results, particularly when local refinement is applied. Multiple buried conductors in a conductive host interact via mutual induction and current flow through the host due to the dissipation of charge accumulated on the conductor boundary. The effect of this interaction varies with host conductivity, transmitter frequency, and conductor geometry, orientation, and conductivity. For three test models containingtwo highly conductive plate-like targets, oriented in various geometries (parallel, perpendicular, and horizontal), mutual coupling ranges as high as twenty times the total magnetic field. The effect of varying host conductivity is significant, especially at high frequencies. Numerical modeling also shows that the vorticity of the currents density induced in a vertically oriented plate-like conductor rotates from vertical at high frequencies, to horizontal at low frequencies, a phenomenon confirmed by comparison with time domain field data collected in Brazos County, Texas. Furthermore, the effect of the presence of a simple horst on the CSEM response of a homogeneous conductive earth is significant, even when the height of the horst is only a fraction of the skin depth of the model. When the transmitter is placedon topofthe horst, the currents inducedtherein account for nearly all of the total magnetic field of the model, indicating that topography, like mutual coupling must be accounted for when interpreting CSEM data.
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Durukan, Ilker. "Effects Of Induction Heating Parameters On Forging Billet Temperature." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608879/index.pdf.
Full textAbstract:
Induction heating is one of the efficient and modern technique for heating raw materials for hot forging process. The induction heating furnaces use electro-magnetic field to transfer energy to the metal workpiece and heat is generated inside the material. The magnetic field can be provided by using induction coil. The power supplied to induction coil, the moving speed of the billet that is called conveyor speed and the coil box hole diameter are the factors affecting the resultant temperature of the heated billet.
In this study, AISI 1045 type steel billets with a diameter of Ø<br>30 mm and length of 100 mm have been heated in a particular induction heater. During heating, effects of different levels of power, conveyor speed and the coil boxes with different hole diameters are investigated. The 125 KW 3000 Hz induction heater which is available in METU-BILTIR Research and Application Center Forging Laboratory is used in experiments. The heating experiments are designed according to 23 Factorial Design of Experiment Method. Multiple linear regression technique is used to derive a mathematical formula to predict the temperature of the heated billet. A good correlation between the measured temperatures that are the results of different sets of induction heating parameters and the predicted temperatures that are calculated by using temperature prediction formula has been observed.
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Owens, III Albert Phillip. "ANGIOTENSIN II INDUCTION OF REGIONAL EFFECTS IN MURINE VASCULATURE." UKnowledge, 2009. http://uknowledge.uky.edu/gradschool_diss/683.
Full textAbstract:
The renin angiotensin system (RAS) exerts many diverse physiological functions throughout the body, mediated by its effector peptide, angiotensin II (AngII). AngII has been linked with a variety of different functions ranging from the initiation of severe vascular pathologies, such as atherosclerosis and abdominal aortic aneurysm (AAA), to mundane physiological processes of fluid homeostasis, vascular contraction, and regulation of blood pressure. To provide a potential link between these functions, an in-depth analysis of regional effects of AngII on aortic vasculature was performed.
The studies presented in this dissertation tested the overall hypothesis of whether regional changes exist in the vasculature in response to angiotensin II (AngII). We first infused AngII into C57BL/6 animals and studied the aortic morphology in detail. On first glance, we detected a thickening throughout the aorta, with no overt changes from region to region. However, upon further analysis, it was demonstrated that there was a region-specific aortic arch hyperplasia, versus the hypertrophy in the remainder of the aorta. Through a series of experiments, this hyperplasia was linked to the redox-mediated protein Id3. Further analysis of the vasculature demonstrated AngII exerted aortic contractions which were limited to the infrarenal aorta. These contractions were mediated by the AT1b receptor subtype in the RAS. We also demonstrate that AngII leads to suprarenal specific formation of AAA, which can be attenuated by the deletion of specific innate immune mediator proteins, such as MyD88 and TLR4. Overall, these data suggest many region-specific roles for AngII in the aortic vasculature and provide many novel findings as to the cause of these effects.
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Badyaev, Alexander, and Kevin Oh. "Environmental induction and phenotypic retention of adaptive maternal effects." BioMed Central, 2008. http://hdl.handle.net/10150/610376.
Full textAbstract:
BACKGROUND:The origin of complex adaptations is one of the most controversial questions in biology. Environmental induction of novel phenotypes, where phenotypic retention of adaptive developmental variation is enabled by organismal complexity and homeostasis, can be a starting point in the evolution of some adaptations, but empirical examples are rare. Comparisons of populations that differ in historical recurrence of environmental induction can offer insight into its evolutionary significance, and recent colonization of North America by the house finch (Carpodacus mexicanus) provides such an opportunity.RESULTS:In both native (southern Arizona) and newly established (northern Montana, 18 generations) populations, breeding female finches exhibit the same complex adaptation - a sex-bias in ovulation sequence - in response to population-specific environmental stimulus of differing recurrence. We document that, in the new population, the adaptation is induced by a novel environment during females' first breeding and is subsequently retained across breeding attempts. In the native population, first-breeding females expressed a precise adaptive response to a recurrent environmental stimulus without environmental induction. We document strong selection on environmental cue recognition in both populations and find that rearrangement of the same proximate mechanism - clustering of oocytes that become males and females - can enable an adaptive response to distinct environmental stimuli.CONCLUSION:The results show that developmental plasticity induced by novel environmental conditions confers significant fitness advantages to both maternal and offspring generations and might play an important role not only in the successful establishment of this invasive species across the widest ecological range of extant birds, but also can link environmental induction and genetic inheritance in the evolution of novel adaptations.
45
Wang, Mingyu. "Parameter variation effects in sensorless vector controlled induction machines." Thesis, Liverpool John Moores University, 1999. http://researchonline.ljmu.ac.uk/5021/.
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Verhille, Gautier. "Études expérimentales en magnétohydrodynamique : effet dynamo, turbulence et induction." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2010. http://tel.archives-ouvertes.fr/tel-00533555.
Full textAbstract:
Ce manuscrit est consacré à l'étude de trois aspects de la magnétohydrodynamique : l'effet dynamo, l'influence d'un écoulement turbulent de métal liquide sur un champ magnétique et l'influence d'un champ magnétique fort sur un écoulement turbulent de métal liquide. Des expériences en gallium à l'ENS-Lyon, et des expériences en sodium à Cadarache, au sein de la collaboration VKS (von Karman sodium), on été menées. Une partie est consacrée à l'importance des conditions aux limites pour les processus d'induction et les mécanismes dynamo, tels que révélés par l'expérience VKS. Nous présentons les résultats obtenus en modifiant la conductivité électrique et la perméabilité magnétique des disques dans l'expérience VKG (von Kármán gallium), à bas Rm. Ils mettent en évidence l'importance d'effets d'inductions forts au voisinage de disques en fer. De même, pour comprendre le lien entre la dynamique chaotique du champ dynamo dans l'expérience VKS et celle de l'écoulement turbulent, nous avons mis en place une expérience dynamo semi-homogène avec un effet ω turbulent et un bouclage artificiel. Le champ engendré par cette expérience présente une intermittence de type on-off pilotée par les grandes échelles de l'écoulement. Cette dynamique est alors analogue à celle d'un système avec bruit multiplicatif et bruit additif. Lors de la saturation du champ dynamo, la force de Laplace est suffisamment forte pour modifier l'écoulement et stopper la croissance du champ. Afin d'étudier ce phénomène, nous avons développé deux types de sonde pour mesurer des vitesses dans des métaux liquides. Nous montrons aussi par des mesures locales et globales comment un champ magnétique fort modifie la structure et la dynamique des écoulement tourbillonnaires de von Karman.
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Jordan, Samuel Decon. "EXAMINING THE EFFECTS OF CHANGING REINFORCEMENT SCHEDULE COMPONENTS ON PREVIOUSLY EXTINGUISHED RESPONDING." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1615.
Full textAbstract:
The present study used a Microsoft Visual Basic computer program to examine the effects of changing reinforcement schedule components on response allocation following previously extinguished responding. In Experiment 1, participants allocated responses to three different colored buttons that moved around the screen after each successive click. Components were arranged such that clicking on one button resulted in reinforcer delivery on a programmed variable-interval (VI) 10 s schedule while clicking either of the other two buttons did not result in programmed reinforcer deliveries. Results of Experiment 1 may have been confounded by an unintended signaling of component changes, so an identical experiment was repeated without a point counter visible to the participants. The results of Experiment 2 indicated an induced responding on the button most recently associated with reinforcement when the reinforcement schedule changed. This induction effect is discussed in relation to current conceptions of relapse effects in the scientific literature and implications for treatment of challenging behavior.
48
Christian, Kelly M. "Effects of Anxious Mood on Play Processes." Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1223656658.
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Maroteaux, Anaïs. "Study of Analytical Models for Harmonic Losses Calculations in Traction Induction Motors." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-187662.
Full textAbstract:
This Master Thesis deals with the study of analytical and finite-element (FE) models for calculation of losses in traction induction motors. Motors are fed through inverters for this type of application. Therefore, both fundamental and harmonic losses are considered. The study is done with one particular motor and one initial analytical model. In order to validate the model and improve it, a FE model is developed with the tool FLUX 2D. Several chosen operating points with different modulation patterns are simulated both with FE and analytical models and results are compared. Stator and rotor Joule losses are studied first. A model to calculate stator Joule losses at strand level is proposed as an improvement to the current analytical model. Then iron losses, both in stator and rotor, are calculated. Two different computations methods with data extraction from FE are studied: the Bertotti model and a recently developed method called MVPRS in the report. It is based on a mathematical model for curve fitting of the core loss material data. Results with the two methods are compared with the ones from ana-lytical model. Finally total fundamental and harmonic losses are compared with measurements and conclusions are drawn on the quality and accuracy of the analytical model.<br>Detta examensarbete handlar om analytiska och Finita Element (FE) modeller för beräkning av förluster i asynkronmotorer för traktion. Motorer matas genom växelriktare för denna typ av applikation. Därför är det nödvändigt att både grundläggande och harmoniska förluster beaktas. Studien görs för en särskild motor och en redan existerande analytisk modell. För att validera modellen och förbättra den, utvecklats en FE modell med verktyget FLUX 2D. Flera arbetspunkter med olika moduleringsmönster simuleras både med FE och analytiska modeller och resultaten jämförs. Först studeras stator och rotor Joule förluster. En modell för att beräkna stator Joule förluster i varje ledare föreslås som en förbättring av den nuvarande analytiska modellen. Sedan beräknas järnförluster, både i stator och rotor, beräknas. Två olika metoder baserad på flödestäthet variationer i tid och rum från FE simuleringar studeras med Bertottis modell och en nyutvecklad metod som kallas MVPRS. Den är baserat på en matematisk modell för kurvanpassning av materialet förlust data. Resultaten med de två metoderna jämförs med de från analytiska modellen. Slutligen jämförs totala fundamentala och harmoniska förluster med mätningar och slutsatser dras om kvalitet och noggrannhet av analytiska modellen.
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Xiang, Ziyin. "Enhancing low-frequency induction heating effect of ferromagnetic composites : Toward medical applications." Thesis, Lyon, 2021. http://www.theses.fr/2021LYSEI022.
Full textAbstract:
Les composites ferromagnétiques, matrices polymères renforcées de particules ferromagnétiques présentent un potentiel intéressant dans de nombreuses applications médicales. Dans cette thèse, nous nous concentrons particulièrement autour du Chauffage par Induction Basse Fréquence (CIBF) de cathéters ferromagnétiques, une méthode alternative pour l'ablation des varices. L'effet CIBF apparaît dès lors que le composite est exposé à un champ magnétique alternatif. Ce phénomène est principalement dû aux courants de Foucault dits "microscopiques" générés par les mouvements des parois des domaines magnétiques. En introduisant le cathéter à travers la varice endommagée et en l'excitant par un champ magnétique basse fréquence, haute amplitude, il est concevable d'atteindre une température suffisamment élevée pour guérir correctement la zone endommagée sans perturber les zones saines environnantes. Par comparaison aux traitements existants, la méthode CIBF est précise, économique et simple. En transférant la chaleur sans conduction, l'encombrement du cathéter est réduit et le procédé semble applicable même pour des veines très sinueuses. Des composites ferromagnétiques de différentes formes et fractions volumiques ont été fabriqués et testés grâce à un dispositif expérimental dédié. Différents paramètres (fréquence, pourcentage de particules…) ont été analysés afin d’établir la combinaison présentant la meilleure réponse thermique. Les propriétés physiques (perméabilité, conductivités électrique et thermique) ont également été caractérisées. Un modèle Comsol® combinant comportement ferromagnétique et thermique a été conçu afin d’améliorer la compréhension des phénomènes. Pour améliorer la conversion, des échantillons anisotropes ont été développés en imposant un champ magnétique statique dans la phase de solidification. Finalement, une imprimante 3D de type extrusion a été utilisée pour imprimer des échantillons de formes proches de celle d’un cathéter. Des spécimens isotropes et anisotropes ont été imprimés. Les réponses CIBF distinctes et marquées entre les différentes directions testées chez les échantillons anisotropes ouvrent la voie à d’autres applications médicales comme le suivi électromagnétique (navigation chirurgicale)<br>Ferromagnetic composites, polymer matrix mixed with ferromagnetic particles show good potential in medical applications. In this thesis, we especially focus on the Low Frequency Induction Heating (LFIH) of ferromagnetic catheters as an alternative process for varicose veins ablation. The LFIH effect appears as soon as the composite is exposed to an alternating magnetic field. This phenomenon is mainly due to the so-called "microscopic" eddy currents generated by the magnetic domain wall motions. By inserting the catheter through a damaged varicose vein, and exciting it with a low frequency, high amplitude magnetic field, it is conceivable to reach a temperature high enough to properly heal the damaged area without injuring the surrounding healthy ones. Compared to the existing treatments, the LFIH method is accurate, cost competitive and simple. By transferring heat in a non-conductive way, the catheter bulkiness is reduced and the method is applicable even in tortuous veins. Ferromagnetic composites with different shapes and particle volume fractions were built and tested in a specific experimental bench. Different parameters (frequency, particle fraction …) were analyzed to reach the best thermal answer. The physical properties (permeability, electrical and thermal conductivities) were also characterized. A Comsol® model combining ferromagnetic behavior and thermal transfer properties was designed to improve the understanding of the phenomena. For a better efficiency, specimens with anisotropic magnetic behaviors were built by curing them under the influence of a static magnetic field. Finally, a commercial extrusion-type 3D printer was used to print samples with catheter shapes. Isotropic and anisotropic specimens were built. Interesting LFIH behavior were observed and for the later ones directional answers potentially interesting in alternative medical applications like the electromagnetic tracking (surgery navigation)