Dissertations / Theses on the topic 'Electric resistance'
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Wang, Shenshen. "Theoretical approach to circular-polarization-independence of microwave-induced resistance oscillations and zero resistance state /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202007%20WANG.
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Akram, Shakeel. "High temperature and high electrical resistance multilayer polyimide nanodielectrics for electric motors insulation." Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTS028.
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Dans cette thèse, les films multicouches PI / nanocomposites ont été préparés selon un processus de synthèse optimisé. Les échantillons synthétisés ont été caractérisés expérimentalement et par simulations. Tout d'abord, le mécanisme de dégradation des échantillons a été exploré à l'aide d’un générateur d’impulsions. La constante diélectrique, les pertes diélectriques, la rigidité diélectrique, le courant de conduction, la charge d'espace et le courant thermo-stimulé (CTS), ont été étudiées. Ensuite, les niveaux de piège ont été calculés à l'aide des données de déclin de la charge totale et de CTS. Enfin, des modèles 3D de multicouches PI / nanocomposites basés sur les conditions aux limites obtenues à partir d'images SEM / TEM ont été construits dans COMSOL Multiphysics. Ces modèles décrivent l'impact de la dispersion des nanoparticules sur l'amplification du champ électrique. Nos résultats démontrent moins d’agglomération de nanoparticules dans les multicouches et une diminution des charges d’espace et du champ électrique interne. Ainsi, l’utilisation d’isolations multicouches devraient permettre une meilleure fiabilité des moteurs électriquesIn this thesis, the multilayer PI/nanocomposite films were prepared using an optimized synthesis process. The synthesized samples are characterized by experiments and simulations. First, the samples degradation mechanism was explored using pulse power source. Second, dielectric constant, dielectric loss, insulation lifetime, dielectric strength, conduction current, space charge and thermal stimulated current (TSC) were investigated. Third, trap levels were calculated using total charge decay data and TSC data. In the end, multilayer PI/nanocomposite 3D models based on actual boundary conditions obtained from SEM/TEM images of synthesized samples were constructed in COMSOL Multiphysics software. The impact of nanoparticle dispersion on the electric field enhancement is explicitly described in this model. Our results demonstrate that the chances of nanoparticles agglomeration are reduced by using multilayer structure. In consequence, less space charge and low electrical fields are observed in multilayer films. Using multilayer insulations would ensure reliable operation for electric motors and increase its lifetime
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Cheng, Pak Lun. "Experiments and quantitative resistance analyses of as-deposited resistors on organic substrates /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?MECH%202003%20CHENG.
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Wang, Lin. "Mass Transfer and GDL Electric Resistance in PEM Fuel Cells." Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_dissertations/486.
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Many modeling studies have been carried out to simulate the current distribution across the channel and shoulder direction in a proton exchange membrane (PEM) fuel cell. However the modeling results do not show agreement on the current density distribution. At the same time, no experimental measurement result of current density distribution across the channel and the shoulder direction is available to testify the modeling studies. Hence in this work, an experiment was conducted to separately measure the current densities under the channel and the shoulder in a PEM fuel cell by using the specially designed membrane electrode assemblies. The experimental results show that the current density under the channel is lower than that under the shoulder except when the fuel cell load is high. Afterwards two more experiments were carried out to find out the reason causing the higher current density under the shoulder. The effects of the electric resistance of gas diffusion layer (GDL) in the lateral and through-plane directions on the current density distribution were studied respectively. The experimental results show that it is the through-plane electric resistance that leads to the higher current density under the shoulder. Moreover, a three-dimensional fuel cell model is developed using FORTRAN. A new method of combining the thin-film model and homogeneous model is utilized to model the catalyst layer. The model is validated by the experimental data. The distribution of current density, oxygen concentration, membrane phase potential, solid phase potential and overpotential in a PEM fuel cell have been studied by the model. The modeling results show that the new modeling method provides better simulations to the actual transport processes and chemical reaction in the catalyst layer of a PEM fuel cell.
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Decker, Jason John. "Orientation and spatial correlation of wire resistance fluctuations in still air." Diss., Online access via UMI:, 2007.
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Jia, Joey Zong-yi. "Voltage controlled resistance model for MOS transistors." PDXScholar, 1988. https://pdxscholar.library.pdx.edu/open_access_etds/3802.
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The voltage controlled resistance model is developed for a reliable MOS transistor resistance mapping. The model includes both system and local parameters, and incorporates the effect of rise and fall time variations on the gate delay. MOS transistor resistance mapping is applied in logic simulation and timing verification. Also, it can be used in automatic transistor sizing and critical path analysis.
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Wendt, Martin. "Experimental Investigations of Wave Motion and Electric Resistance in Collisionfree Plasmas." Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3199.
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Töyrä, Mendez Ewa Cecilia. "Temperature Dependence of Resistance of a Ni-rich Li-ion Cathode." Thesis, Uppsala universitet, Strukturkemi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-427590.
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Understanding the degradation mechanisms of Li-ion batteries is essential to gain insights into battery aging. The primary research area of this thesis is the positive electrode, NMC811. The purpose of the thesis is to understand how low and elevated temperatures affect the aging of NMC811, by considering the effects on resistance. The aim of the thesis is to investigate the degradation mechanisms of NMC811. Here, three-electrode Li-ion pouch cells are assembled with LiNi8Mn1Co1O2 (NMC811) as the positive electrode, graphite as the negative, gold wire as the reference electrode, and LiPF6 as the electrolyte. The positive electrode impedance is recorded at temperatures –10, 22, and 40 ºC. Also, symmetric and half cells are built for validation measurements. The Nyquist diagrams are fitted through equivalent circuits to determine the cells’ impedance at voltages 3.8 and 3.0 V vs Li+/Li. The resistances observed and analyzed in this project are the high-frequency resistance, the contact resistance, the charge transfer resistance, and the resistance due to the electrode–electrolyte interphase. By comparing these resistances, it is observed that the charge transfer resistance has the highest dependence on the ambient temperature. The increase in charge transfer resistance at –10 ºC is suggested to depend on the Ni-rich electrode, which tends to contribute to volume changes in the electrode, affecting the intercalation and de-intercalation of Li-ions. The resistance reduces significantly at 40 ºC, due to the loss of lithium inventory in the active material. This thesis has thus shown that temperature has a significant effect on cell internal resistance, especially on the electrode–electrolyte interface, which describes the charge transfer reactions.
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Xiao, Lianzhen. "Interpretation of hydration process of concrete based on electrical resistivity measurement /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20XIAO.
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Santiago, Claudia. "Resistivity and conductivity studies of the Rattlesnake Springs, New Mexico watershed." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.
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Ahlstrand, Felicia, and Elin Lindbergh. "Methods to Predict Hull Resistance in the Process of Designing Electric Boats." Thesis, KTH, Marina system, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280565.
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Combustion engines in boats cause several environmental problems, such as greenhouse gas emissions and acidication of oceans. Most of these problems can be reduced by replacing the combustion engines with electric boats. The limited range is one of the main constraints for electric boats, and in order to decrease the energy consumption, applicable resistance prediction methods are necessary in the hull design process. X Shore, which is a start-up company in the electric boat sector, lacks a systematic way of predicting resistance in an early design phase. In this study, four well-known methods - CFD, Holtrop & Mennen, the Savitsky method and model test - have been applied in order to predict resistance for a test hull. The study is limited to bare hull resistance and calm water conditions. CFD simulations are applied using the software ANSYS FLUENT 19:0. The simulations were based on the Reynolds Average Navier-Stokes equations with SST k-ω as turbulence model together with the volume of fluid method describing the two-phased ow of both water and air surrounding the hull. The semi-empirical methods, Holtrop & Mennen and the Savitsky method, are applied through a program in Python 3, developed by the authors. The results from each method have been compared and since model tests have been conducted outside of this study, the model test results will serve as reference. To evaluate the methods, a number of evaluation criteria are identied and evaluated through a Pugh Matrix, a systems engineering tool. Holtrop & Mennen predicts the resistance with low accuracy and consistency, and the error varies between 2:2% and 70:6%. The CFD simulations result in acceptable resistance predictions with good precision for the speeds 4 - 6 knots, with an average deviation of the absolute values as12:28% which is slightly higher than the errors found in previous studies. However, the method shows inconsistency for the higher speeds where the deviation varies between 1:77% and - 43:39%. The Savitsky method predicts accurate results with good precision for planing speeds, but also for the speeds 7 and 8 knots. The method is under-predicting the resistance for all speeds except for 7 knots, where the total resistance is 10:7% higher than for model tests. In the speed range 8 - 32 knots, the average error is an under-estimation of 17:58%. Furthermore, the trim angles predicted by the Savitsky method correspond well with the trim angles from the model test. In conclusion, the recommendation to X Shore is to apply the Savitsky method when its applicability criteria are fulfilled, and CFD for the lowest speeds, where the Savitsky method is not applicable.Förbränningsmotorer i båtar orsakar era miljöproblem, som exempelvis utsläpp av växthusgaser och försurning av hav. De flesta av dessa problem kan minskas genom att ersätta båtar med förbränningsmotorer med elbåtar. Den begränsade körsträckan är en av de största begränsningarna för elbåtar, och för att minska energiförbrukningen behövs metoder för att uppskatta motståndet under designstadiet. X Shore, ett startup-företag i elbåtsbranchen, saknar ett systematiskt tillvägagångssätt för att uppskatta motstånd i tidiga skeden i designprocessen. I den här studien har fyra välkända metoder - CFD, Holtrop & Mennen, Savitsky-metoden och modelltester - applicerats för att uppskatta motståndet hos ett testskrov. Studien är begränsad till ett skrov utan bihang och lugnvattenmotstånd. CFD-simuleringar har gjorts i mjukvaran ANSYS FLUENT 19.0. Simuleringarna är baserade på Reynolds Average Navier-Stokes ekvationer och turbulensmodellen SST k - ω har använts tillsammans med metoden volume of fluid som beskriver ödet av både vatten och luft runt skrovet. De semi-empiriska metoderna, Holtrop & Mennen och Savitsky-metoden, har applicerats genom ett program i Python 3 som utvecklats av författarna. Resultaten från alla metoder har jämförts, och eftersom modelltester genomförts på detta skrov tidigare har de resultaten använts som referensvärden. Ett antal kriterier har identifierats och en Pugh-matris har använts för utvärdering av metoderna. Holtrop & Mennen uppskattar motståndet med låg noggrannhet och precision, felen varierar mellan 2:2% och 70:6%. CFD-simuleringarna ger acceptabla resultat av motståndsberäkningarna för hastigheterna 4 - 6 knop, med ett genomsnittligt absolut fel på 12:28% vilket är något högre än avvikelserna presenterade i tidigare studier. För högre hastigheter uppvisar metoden lägre precision där avvikelsen varierar mellan 1:77% och - 43:39%. Savitsky-metoden ger resultat med hög noggrannhet och god precision för planingshastigheter, men även för hastigheterna 7 och 8 knop. Metoden underskattar motståndet för alla hastigheter förutom för 7 knop där motståndet är 10:7% högre än för modelltesterna. I hastighetsintervallet 8 - 32 knop är det genomsnittliga felet en underskattning på 17:58%. Vidare överensstämmer trimvinkeln från Savitsky-metoden bra med resultaten från modelltesterna. Sammanfattningsvis rekommenderas X Shore att använda Savitsky-metoden när dess kriterier för tillämplighet är uppfyllda och CFD för de lägsta hastigheterna när Savitsky-metoden inte är tillämpbar.
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Goldman, Matthew 1965. "A low sensitivity dual feedback active RC bandpass filter." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277139.
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This thesis presents the analysis and characterization of a low sensitivity dual feedback active RC bandpass filter. Chapter 2 details the analysis of the network and a method of simplifying the resultant transfer function by a single pole/zero cancellation. Chapter 3 characterizes the simplified transfer function through an analysis of the quality factor and of the center frequency gain as functions of the individual variables of the circuit. It also details sensitivity analyses of these characteristic quantities and a stability analysis. Lastly, chapter 3 presents graphical representations of the equations developed so that they can be used as design tools. It then goes through the details of applying these graphs to an example network. Chapter 4 explains the differences between experimental data and predicted data by discussing some of the nonlinearities neglected in the original analysis. Finally chapter 5 restates the design technique in light of the predominant nonlinearities.
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Klass, Verena. "Battery Health Estimation in Electric Vehicles." Doctoral thesis, KTH, Tillämpad elektrokemi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173544.
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For the broad commercial success of electric vehicles (EVs), it is essential to deeply understand how batteries behave in this challenging application. This thesis has therefore been focused on studying automotive lithium-ion batteries in respect of their performance under EV operation. Particularly, the need for simple methods estimating the state-of-health (SOH) of batteries during EV operation has been addressed in order to ensure safe, reliable, and cost-effective EV operation. Within the scope of this thesis, a method has been developed that can estimate the SOH indicators capacity and internal resistance. The method is solely based on signals that are available on-board during ordinary EV operation such as the measured current, voltage, temperature, and the battery management system’s state-of-charge estimate. The approach is based on data-driven battery models (support vector machines (SVM) or system identification) and virtual tests in correspondence to standard performance tests as established in laboratory testing for capacity and resistance determination. The proposed method has been demonstrated for battery data collected in field tests and has also been verified in laboratory. After a first proof-of-concept of the method idea with battery pack data from a plug-in hybrid electric vehicle (PHEV) field test, the method was improved with the help of a laboratory study where battery electric vehicle (BEV) operation of a battery cell was emulated under controlled conditions providing a thorough validation possibility. Precise partial capacity and instantaneous resistance estimations could be derived and an accurate diffusion resistance estimation was achieved by including a current history variable in the SVM-based model. The dynamic system identification battery model gave precise total resistance estimates as well. The SOH estimation method was also applied to a data set from emulated hybrid electric vehicle (HEV) operation of a battery cell on board a heavy-duty vehicle, where on-board standard test validation revealed accurate dynamic voltage estimation performance of the applied model even during high-current situations. In order to exhibit the method’s intended implementation, up-to-date SOH indicators have been estimated from driving data during a one-year time period.QC 20150914
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Deba, Charlie Nindjou. "Evaluation and verification of five different image reconstruction algorithms for electrical resistance tomography applications." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2465.
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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2016.Tomography is the ability to internally visualise an opaque medium or a body, using different imaging techniques. Electrical Resistance Tomography (ERT) technique is a method commonly used in process tomography. It uses a non-intrusive resistance measurement between a set of electrodes attached on the circumference of a fixed cross-section with a given conductivity and permittivity distribution. ERT appears to be simple, low cost, safe and non-invasive. Despite the advantages of ERT, the reconstruction of the internal conductivity of the pipe still face a crucial challenges such as noise, a relatively low spatial resolution, as well as ill-posedness of the inverse problem when doing the image reconstruction using reconstruction algorithms. Although previous work showed the potential of various algorithms for the reconstruction of ERT tomograms, no full characterisation and comparison of different algorithms could be found for real flow situations. The ERT system was tested in the identification of different objects and fluid beds in a real time situation. The data collected from the measurements were then used for the image reconstruction using an algorithm developed by Time Long (One-step algorithm) and four EIDORS-based algorithms namely: Gauss-Newton algorithm with Laplace Prior (LP) and Gaussian prior (Automatic Hyper Parameter Selection (AHSP)), the Total Variation (TV) algorithm and the Conjugate Gradient (CG) algorithm. The performance of each algorithm was tested in different scenarios. The results obtained were then compared based on the quality and the accuracy of the images as well as the computational time of each algorithm. Firstly, reconstructed images were obtained using objects placed inside the ERT pipe test. Secondly, the algorithm performances were put to test in a level bed setup experiment and finally, the algorithm reconstructions were applied to the real flow situation, where different flow rates were applied. The results obtained were then analysed and compared.
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Ritchie, Porter. "The Susceptibility of Electric Resistance Welded Line Pipe to Selective Seam Weld Corrosion." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1586336007742949.
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Zhao, Xin. "Design of current controller for single phase AC resistance spot welding (RSW) machine using fourier learning scheme /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MECH%202006%20ZHAOX.
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Arqam, Mohammad. "Thermomechanical analysis of compact high-performance electric swashplate compressor." Thesis, Griffith University, 2021. http://hdl.handle.net/10072/410159.
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This PhD is sponsored by industry and is part of a project to develop and manufacture smart electric compressor for mobile refrigeration and air conditioning applications on commercial and heavy vehicles including industrial machinery. Compact electric compressors are of great value for the future due to the growth of the electric vehicle market. Recent advancements in the field of mobile air conditioning and refrigeration have witnessed extensive use of the swashplate compressor due to its compact structure, continuous operation, small size, light weight and better thermal comfort inside the vehicle. The design of the swashplate compressor is complex so that it requires considerable contributions from different fields of engineering viz. engineering mechanics, heat transfer and fluid dynamics. The estimate of compressor performance through modelling and experiments at the early stages of design and development serves as a useful tool for the designer. The input power, torque, in-cylinder gas pressure and temperature, flow through valves, and volumetric efficiency are important parameters to characterize the compressor performance. In this thesis, a set of practical thermomechanical models are derived and validated against experiments. An ideal gas based analytical model is developed for a 10 cylinder swashplate compressor with a view to predict its performance in terms of shaft torque and mass flow rate for a given rotational speed requiring minimal computational effort to run. Three sub-models are developed to account for the piston and swashplate kinematics and dynamics through deriving expressions for piston displacement as an explicit function of angle of rotation of swashplate and interactions between forces and moments. The compression process model is formulated to predict in-cylinder temperatures and pressures during one revolution of the swashplate together with refrigerant mass flow rate in and out of the compressor. A complete time-varying model is then developed by combining above three sub-models. Results are obtained in terms of compressor torque and volumetric efficiency and agree well with experiments. Considering the importance of refrigerant flow through reed valves affecting compressor performance, a real-gas, restricted-flow valve model is also developed and compared with the ideal-gas, ideal-valve model. Real gas properties of R134a are evaluated using NIST standard reference database. A minor-loss discharge coefficient approach is used to determine the refrigerant flow rate through reed valves. The model predicts the discharge temperature, refrigerant mass flow rate and volumetric efficiency accurately as a function of rotational speed. The effect of real gas properties, heat transfer to and from the compressor wall during compression and expansion and the valve model are analyzed. The suction side valve model is found to have the largest influence on the compressor performance as a function of rpm whereas heat transfer model has the least. The key contribution of this study is in assembling a practical combination of models that is capable of capturing the essential physics without being overly complex. To the authors’ knowledge this is the first swashplate study that shows clearly the cyclic variation in thermo-physical properties. The literature shows the dynamic characteristics of the compressor are well connected with the start-up transients of the swashplate mechanism and the suction and discharge pressures. To evaluate this, an experimentally validated transient swashplate compressor model is developed including mass moment of inertia of the pistons and swashplate to evaluate the motor torque loading during compressor start-up. The effects of essential parameters such as moment of inertia, bearing torque, viscous resistance to the piston motion, suction and discharge pressures on the compressor performance are presented. The actual start-up behavior is tracked using a high-speed data logger capturing phase currents for the BLDC motor, instantaneous power and rotational speed. The suction and discharge pressures are found to have the largest influence on the starting torque whereas rotational mass moment of inertia has the least. The original contribution of this work is in deriving a transient swashplate compressor model that includes the mass moment of inertia of the swashplate mechanism and clarifying the relative importance of line pressures, viscous losses and bearing resistance on the start-up torque. Since minimizing the size of the compact Brushless DC (BLDC) motor driving the compressor is important, it is worth optimizing the cooling performance of the electric motor. An experimentally validated computational fluid dynamics (CFD) model is developed to investigate the thermal performance of an air-cooled Brushless Direct Current (BLDC) motor driving swashplate compressor. Different fin arrangements on the motor housing are analysed including small protrusions on the fin surface. The findings show greater enhancements can be achieved by adding an extra fin in the cooling flow passage rather than through the inclusion of grooved walls. Thermographs of the motor housing are found to be in close agreement with the model predictions. The key achievement of this thermal investigation is in demonstrating air-cooling is a practical and effective alternative to refrigerant cooling of compact high performance electric swashplate compressors for mobile refrigeration and air conditioning applications. The effect of thermal resistance between the windings and stator core of an air-cooled Brushless DC motor is also investigated. Measurements are found to be in close agreement with predictions. The numerical simulations suggest significant benefits of injecting encapsulation material in the stator core to enhance heat transmission from windings to the surrounding electrical steel. To confirm this, an experimental investigation is carried out by adding thermal resin to the winding slots on 2.5 kW and 4 kW brushless DC motors. The findings show that the potting material can reduce the temperature of the windings by 10 °C to 20 °C for electrical power inputs of 2.4 kW to 3.8 kW. The winding temperature is also found to be sensitive to the winding arrangement in the stator slot. With tighter, more compact windings also leading to significant temperature reductions.Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
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Mei, Wenlong. "Finite element modeling of resistance spot welding and nugget properties prediction /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?MECH%202009%20MEI.
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Yao, Hui. "Study of the giant electroresistance in epitaxial thin films of La0.9Sr0.1MnO3." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B3640911X.
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Weemees, Ilmar Andrew. "Development of an electrical resistivity cone for groundwater contamination studies." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/28730.
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The evaluation of groundwater quality has become increasingly important as more industrial waste and solid domestic refuse comes into contact with groundwater. Often the quantity and extent of contamination is determined by direct sampling of the groundwater and soil. An alternative method of detecting contaminated groundwater is by noting the electrical resistivity of the contaminated soil. The feasibility of logging resistivity while conducting cone penetrometer testing has been investigated in this research. To this end a two stage program was devised, consisting of lab testing and then field tests of a working tool.
Lab testing was carried out using a prototype probe designed to evaluate the feasibility of the project. The lab testing consisted of determining the resistivity of a number of different soil, electrolyte, and organic contaminant mixtures while varying the configuration of the probe. On the basis of lab testing the necessary requirements for the module dimensions and electronics were chosen and were fine tuned by field tests. The module itself consists of an insulated four electrode array and is mounted behind a standard 15 sq cm piezo-cone (CPTU). Upon completion of the development phase the instrument was tested at four different sites. From field testing it was determined that the resistivity cone (RCPTU) was able to accurately map changes in groundwater chemistry on the basis of resistivity measurements. The results of the resistivity testing were verified by groundwater sampling. It was also found that changes in lithological properties, as determined by the cone penetration test (CPT), could influence the resistivity. Basic guidelines for the use of the RCPTU in contaminant investigations are presented.Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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Yao, Hui, and 姚暉. "Study of the giant electroresistance in epitaxial thin films of La0.9Sr0.1MnO3." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B3640911X.
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Aguirre, Gerardo 1960. "AN APPRAISAL OF THE ELECTRICALLY THIN CONDUCTIVE SHEET MODEL IN GEOPHYSICAL PROBING." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/275495.
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Davalbhakta, Aneesh. "Improved configurations of sensors for the measurement of tower footing resistance a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2008. http://proquest.umi.com/pqdweb?index=0&did=1597632921&SrchMode=1&sid=4&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1279309880&clientId=28564.
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Dai, Wen Long. "Analysis and development of a real-time control methodology in resistance spot welding /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487687115924949.
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Engesser, Valeska Katharina, and Inna Sawatzki. "Consumer Restistance to Innovations : The Case of Electric Passenger Cars on Gotland." Thesis, Uppsala universitet, Företagsekonomiska institutionen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-303085.
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Background: The Swedish island Gotland provides suitable conditions for the successful implementation of electric cars. Despite these conditions and the availability of the product in the Gotlandic market, electric cars do not find acceptance among consumers on Gotland. This phenomenon of consumer resistance behavior represents a rather under-researched area in current literature. Since resistance behavior is one of the main reasons responsible for the high failure rate of innovative products such as electric cars, this justifies the relevance of this study. Purpose: The aim of this study is to explore the reasons for consumer resistance behavior towards electric cars on Gotland. By answering this question, the authors intend to contribute not only theoretically to the existing theory of this phenomenon but also to shed new light on the special case of Gotland regarding the non-adoption of electric cars. Methodology: In order to answer the research question, an exploratory case study approach was chosen. Quantitative data in form of a questionnaire as well as qualitative data including a group interview and six expert interviews were collected and analyzed. Key findings: The barriers preventing consumers on Gotland from adopting electric cars are rooted in four different areas. First, functional barriers occur due to the limited range of electric cars, the existing charging infrastructure, the purchase cost, as well as the technological development status of the car batteries. Second, institutional barriers arise since the local government does not provide sufficient support for the further implementation of electric cars and related issues. Third, a contextual barrier in terms of the local car industry was figured out. This contributes a lot the last identified barrier, the cognitive barrier, which concerns the consumers themselves since their lacking knowledge and awareness about issues related to electric cars on Gotland is one of the main reasons for the resistance towards this innovation. As long as these barriers exist, consumers tend to postpone the buying decision of this product to a future point in time.
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Rigoti, Augustinho. "Reduction of ambiguity in geological models using multiple data sets." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66266.
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Zhang, Jie. "Microstructure study of cementitious materials using resistivity measurement /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202008%20ZHANG.
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Le, Dong D. Vaidyanathan Vijay Varadarajan. "Electrical resistivity as a measure of change of state in substrates design, development and validation of a microprocessor-based system /." [Denton, Tex.] : University of North Texas, 2009. http://digital.library.unt.edu/ark:/67531/metadc12149.
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Kim, Junhyung. "Analysis of Direct-Soldered Power Module / Heat Sink Thermal Interface for Electric Vehicle Applications." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32071.
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Reducing the thermal impedance between power module and heat sink is important for high-power density, low-cost inverter applications. Mounting a power module by directly soldering it onto a heat sink can significantly reduce the thermal impedance at the module / heat sink interface, as compared to the conventional method of bolting the two together with a thermal grease or some other interface materials in between. However, a soldered interface typically contains a large number of voids, which results in local hot spots. This thesis describes approaches taken to reduce voids in the solder layer through surface treatment, solder paste selection, and adjustment in solder-reflow conditions. A 15MHz scanning acoustic microscope (SAM), a non-destructive inspection tool, was used to determine the void content at the module / heat sink interface. The experimental results show that a significant reduction in thermal resistance can be achieved by reducing the void content at the soldered module / heat sink interface. Moreover, a comparison of the thermal resistances in cases using the worst soldering, which contains the largest voided area, ThermstrateTM and thermal grease are presented. Thermal performances of the modules are studied by simulation with Flotherm.Master of Science
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Zhou, Baifan [Verfasser], and R. [Akademischer Betreuer] Mikut. "Machine Learning Methods for Product Quality Monitoring in Electric Resistance Welding / Baifan Zhou ; Betreuer: R. Mikut." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/123335907X/34.
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Talbot, Edith. "Manufacturing process modelling of thermoplastic composite resistance welding." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=83934.
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One-, two- and three-dimensional transient heat transfer finite element models are developed to simulate the resistance welding process of pre-consolidated unidirectional AS4 carbon fibre reinforced Poly-ether-ether-ketone (APC-2/AS4) laminates with a metal mesh heating element, in a lap-shear configuration. The finite element models are used to investigate the effect of process and material parameters on the thermal behaviour of the coupon size welds, yielding to a better understanding of the process. The 1-D model determines: (a) the importance of including the latent heat of PEEK, and (b) the through-thickness temperature gradient away from the edges, for different tooling plate materials. The 2-D model simulates the cross-section of the process, considering the convective and irradiative heat losses from the areas of the heating element exposed to air. The 3-D model includes the heat conduction along the length of the laminates, to fully depict the thermal behaviour of the welds. Finally, the models are compared with experimental data.
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Somogye, Ryan H. "An aging model of Ni-MH batteries for use in hybrid-electric vehicles." Connect to resource, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1134658219.
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Thesis (M.S.)--Ohio State University, 2004.Advisor: Stephen Yurkovich, Dept. of Electrical Engineering. Includes bibliographical references (leaves 155-156). Available online via OhioLINK's ETD Center
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Whelchel, Ricky Lee. "Characterization of a nickel-base superalloy through electrical resistivity-microstructure relationships facilitated by small angle scattering." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41130.
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Nickel-base superalloys obtain high temperature mechanical properties through formation of precipitate phases formed via heat treatment. The precipitate microstructure evolves with heat treatment or thermal exposure, which can lead to degrading mechanical properties. This project focuses on the use of electrical resistivity as a non-destructive testing method to monitor the precipitate phase in Waspaloy (a polycrystalline nickel-base superalloy). The evolution of the precipitate microstructure is characterized throughout the volume of the specimens using both small angle neutron scattering (SANS) and ultra small angle X-ray scattering (USAXS) measurements. These measurements are also aided by microscopy and X-ray diffraction measurements.
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Oldenborger, Greg Arthur. "Advances in electrical resistivity tomography : modeling, electrode position errors, time-lapse monitoring of an injection/withdrawal experiment, and solution appraisal /." ProQuest subscription required:, 2006. http://proquest.umi.com/pqdweb?did=1179956331&sid=1&Fmt=2&clientId=8813&RQT=309&VName=PQD.
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Thesis (Ph. D.)--Boise State University, 2006.Includes abstract and vita. Includes bibliographical references (leaves 319-331). Also available online via the ProQuest Digital Dissertations database.
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Bathe, Abhijit. "Geotechnical properties of soils using electrical measurements." Ohio : Ohio University, 2005. http://www.ohiolink.edu/etd/view.cgi?ohiou1177436956.
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Abdelnabi, Bassam Sabry Mohammad. "Equivalent circuit for transient conduction and convection systems." Diss., Rolla, Mo. : University of Missouri-Rolla, 2007. http://scholarsmine.umr.edu/thesis/pdf/Master_Thesis_Nuclear_09007dcc80360230.pdf.
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Thesis (M.S.)--University of Missouri--Rolla, 2007.Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed November 14, 2007) Includes bibliographical references.
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Pinheiro, Francisco NascÃlio. "Development of a New Prototype Thermal Desalination with Heat Recovery Triggered by Source Controlled of Electric Energy." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11517.
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CoordenaÃÃo de AperfeiÃoamento de NÃvel SuperiorSolar thermal desalination plants operate with variable heat source, solar radiation, which complicates the identification of the influence of process variables and of the constructive geometric parameters. In operation, brackish or salt water is heated in a storage tank, where it evaporates and condenses on the walls of a lower metal tray (first stage) installed above the tank. By condensing, the steam transfers heat to the salt water of this first stage and the condensate is collected on the outside of the tank. This work aims to develop a new prototype desalination unit with thermal controllable operating parameters for operation in transient and steady states. In the prototype, the heating of the water to be desalinated is done by electrical resistance with controllable source, allowing the variation of the desired heating power. Sensors of the type PT-100 were installed, especially specified for the dimensions of the storage tank for measuring water temperature at different positions in the tank. The mass of water in the tank is measured by a precision balance. With the measurements, graphics of water temperature of the tank during the heating, the cooling and the steady state were constructed. Also, the Global Coefficient of Heat Transfer was measured for phases of heating, cooling and steady state. Finally, desalination was found by the electrical conductivity of the used water.
Dessalinizadores solares tÃrmicos operam com fonte variÃvel de calor, a radiaÃÃo solar, o que dificulta a identificaÃÃo da influÃncia das variÃveis de processo e dos parÃmetros geomÃtricos construtivos. Em seu funcionamento, Ãgua salobra ou salgada à aquecida em um tanque de armazenamento, onde evapora e condensa nas paredes inferiores de uma bandeja metÃlica (primeiro estÃgio) instalada acima do tanque. Ao condensar, o vapor transfere calor para a Ãgua salgada desse primeiro estÃgio e o condensado à coletado no exterior do tanque. O presente trabalho tem como objetivo o desenvolvimento de um novo protÃtipo de dessalinizador tÃrmico com parÃmetros operacionais controlÃveis para funcionamento em regimes transiente e permanente. No protÃtipo, o aquecimento da Ãgua a ser dessalinizada à feito por resistÃncia elÃtrica com fonte de tensÃo controlÃvel, permitindo a variaÃÃo desejÃvel da potÃncia de aquecimento. Foram instalados sensores do tipo PT-100, especialmente especificados para as dimensÃes do tanque de armazenamento, para mediÃÃes de temperaturas da Ãgua em diferentes posiÃÃes no tanque. A massa de Ãgua no tanque à medida por balanÃa de precisÃo. Com as mediÃÃes realizadas, foram construÃdos grÃficos de temperatura da Ãgua do tanque durante os regimes constante de aquecimento e resfriamento. Foi tambÃm medido o Coeficiente Global de TransferÃncia de Calor para as fases de aquecimento, regime permanente e resfriamento. Por fim, foi constatada a dessalinizaÃÃo por medidas de condutividade elÃtrica da Ãgua utilizada.
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Lee, Eunguk. "AC loss in superconducting composites continuous and discrete models for round and rectangular cross sections, and comparisons to experiments /." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1078770042.
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Thesis (Ph. D.)--Ohio State University, 2004.Title from first page of PDF file. Document formatted into pages; contains xv, 129 p.; also includes graphics. Includes bibliographical references. Available online via OhioLINK's ETD Center.
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Kabengele, Kantu. "Identification of flow patterns for coarse particles transported in a non-Newtonian carrier using electrical resistance tomography." Thesis, Cape Peninsula University of Technology, 2012. http://hdl.handle.net/20.500.11838/1247.
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A dissertation submitted to the Faculty of Engineering, Cape Peninsula University of Technology, Cape Town, in partial fulfilment of the requirements for the MTech Degree in Mechanical Engineering
2012Flow features provide considerable guidance for the rational selection of techniques to predict hydraulic behaviour and for suitable operating conditions for pipelines. Traditionally, water was used to transport coarse particles, and it was necessary to operate at velocities at which the flow was turbulent in order to avoid blockage. Consequently the friction losses were too high for economic operation. In addition, wear on pipes, fittings and pumps presented serious problems. Nowadays, it is well established that it is possible to operate at very high solids concentration in a heavy vehicle (carrier fluid). Similar solids throughputs may be achieved at very much lower velocities by operating in the laminar flow regime. This results not only in lower power requirement, but it also reduces wear and water consumption. In spite of these potential benefits, only a few studies dealing with the transport of coarse particles in heavy media have been reported. Since the distinction between different flow patterns is of paramount importance for modelling purposes, as equations are flow pattern dependent, and given the importance of avoiding excessive wear of pipes at low and high velocities, the present work was carried out in the context of dense or non-Newtonian carrier fluid. This project comprised analysis of existing data acquired at the Flow Process and Rheology Centre of the Cape Peninsula University of Technology. Kaolin in the range of 6% to 15% volumetric concentration was used as a carrier fluid and coarse material in the range of 10% to 30% volumetric concentration was simulated by silica sand ranging in size from 1 mm to 3 mm. For the purpose of this study flow patterns derived from resistance curves for various mixtures, particle concentrations, particle grading and flow conditions were compared with “concentration profiles” and images obtained from electrical resistance tomography (ERT). It appeared from this work that the sand concentration does not change the flow pattern but increases or reduces the pressure gradients depending on the case. The concentration of kaolin carrier can change the flow patterns from layered to homogeneous flow, inducing an increase in total pressure gradients as it increases. Flow patterns obtained from ERT compared reasonably well with those derived from pressure gradients profiles. The transition velocities from layered to heterogeneous flow obtained from both methods were similar, especially for low and moderate carrier concentrations. As the kaolin carrier concentration or as the sand concentration increased it became more difficult to distinguish the transition velocity between heterogeneous and layered flow. More work is still needed to improve the ERT instrument and its image reconstruction software.
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Spinelli, Júnior Adhemar José [UNESP]. "Análise do processo de torneamento a quente auxiliado por resistência elétrica de quartzo." Universidade Estadual Paulista (UNESP), 2004. http://hdl.handle.net/11449/90806.
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spinellijunior_aj_me_bauru_prot.pdf: 2793116 bytes, checksum: 2a5518c4628bc08924a0d2677ef48198 (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Um dos principais objetivos da indústria metal-mecânica é o aumento da produtividade nos processos de usinagem, o que pode ser conseguido por meio de maiores taxas de remoção de material. Este requisito está associado ao desgaste da ferramenta de corte, uma vez que a redução de sua vida acarreta aumento dos custos de fabricação, não só pelo valor unitário da ferramenta, mas também pelo tempo consumido na indesejável interrupção da operação. Atualmente, um dos importantes caminhos para o aumento da vida da ferramenta aponta para o desenvolvimento de materiais mais resistentes ao desgaste, como as pastilhas de nitreto cúbico de boro policristalino (PCBN). No entanto, o custo unitário destas ferramentas é consideravelmente alto...
One of the main of the metalworking industry is the increase of productivity in machining processes, which can be obtained through larger material removal rates. This requirement is associated to be cutting tool wear evolution, since the reduction of tool life increases the production costs, not only for unitary value of the tool, but also for the time consumed in the undesirable interruption of the operation. Nowadays, an important way to increase tool life is the development of more wear resistant materials, such as polycrystalline cubic boron nitride (PCBN) cutting tools. However, the unitary cost of these tools is considerably high, about 10 to 20 times more expensive that coated carbide tools. In addition its best performance occurs at high-speed machining, that demands modern machine tools. Many researchers have been using the technique of heating a workpiece layer immediately before its removal by the cutting tool in order to reduce the shear stress and to improve... (Complete abstract click electronic access below)
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Дяговченко, Ілля Миколайович, Илья Николаевич Дяговченко, Illia Mykolaiovych Diahovchenko, M. O. Kartalov, and V. S. Havriluk. "The Influence of Switching and Changing of Resistance Value of Incandescent Lamp on Watt-hour Energy Accounting." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/41396.
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The expediency of repeated switching of regular incandescent lamp (IL) was checked by using calculation and experimental methods from the point of view of electric energy consumption. The induction and electronic
single-phase meters of commercial accounting of active electrical power, intended for single-phase alternating current circuits were used to determine the amount of consumed electric energy.
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Bolas, Eduardo J. "Coding-spreading tradeoff in CDMA systems." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02sep%5FBolas.pdf.
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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2002.Thesis advisor(s): Tri T. Ha, Jan E. Tighe, Jovan E. Lebaric. Includes bibliographical references (p. 85). Also available online.
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SOUZA, KELLIE P. de. "A influência do ferro e do óxido de cério sobre a condutividade elétrica e a resistência à corrosão do alumínio anodizado." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11423.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Sun, Ta-chien. "Fundamental study of contact resistance behavior in RSW aluminum." Connect to this title online, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1069807481.
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Thesis (Ph. D.)--Ohio State University, 2003.Title from first page of PDF file. Document formatted into pages; contains xxviii, 314 p.; also includes graphics (some col.) Includes bibliographical references (p. 303-314). Available online via OhioLINK's ETD Center
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Pokorný, Pavel. "Construction of the Optimal Control Strategy for an Electric-Powered Train." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233935.
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Předložená disertační práce se zabývá popisem charakteru optimální strategie řízení pro elektrický vlak a výpočtem přepínacích okamžiků mezi jednotlivými optimálními jízdními režimy pro standardní typy odporové funkce. S využitím Pontrjaginova principu a souvisejících nástrojů teorie optimálního řízení odvodíme optimální strategii řízení a rovnice pro výpočet přepínacích okamžiků včetně odpovídajících rychlostních profilů. Kromě základního tvaru úlohy o energeticky optimální jízdě vlaku budeme uvažovat i její modifikace zahrnující globální rychlostní omezení, sklon trati i časově-energeticky optimální řízení vlaku. Navíc uvedeme i analýzu řešení s využitím teorie nelineární parametrické optimalizace. Důraz je kladen na exaktní tvar řešení s minimálním využitím numerických metod.
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Le, Dong D. "Electrical resistivity as a measure of change of state in substrates: Design, development and validation of a microprocessor-based system." Thesis, University of North Texas, 2009. https://digital.library.unt.edu/ark:/67531/metadc12149/.
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Smart structures are relevant and significant because of their relevance to phenomena such as hazard mitigation, structural health monitoring and energy saving. Electrical resistance could potentially serve as an indicator of structural well-being or damage in the structure. To this end, the development of a microprocessor-based automated resistance measurement system with customized GUI is desired. In this research, a nodal electrical resistance acquisition circuit (NERAC) system was designed. The system hardware interfaces to a laptop, which houses a customized GUI developed using DAQFactory software. Resistance/impedance was measured using DC/AC methods with four-point probes technique, on three substrates. Baseline reading before damage was noted and compared with the resistance measured after damage. The device was calibrated and validated on three different substrates. Resistance measurements were taken from PVDF samples, composite panels and smart concrete. Results conformed to previous work done on these substrates, validating the effective working of the NERAC device.
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Spinelli, Júnior Adhemar José. "Análise do processo de torneamento a quente auxiliado por resistência elétrica de quartzo /." Bauru : [s.n.], 2004. http://hdl.handle.net/11449/90806.
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Resumo: Um dos principais objetivos da indústria metal-mecânica é o aumento da produtividade nos processos de usinagem, o que pode ser conseguido por meio de maiores taxas de remoção de material. Este requisito está associado ao desgaste da ferramenta de corte, uma vez que a redução de sua vida acarreta aumento dos custos de fabricação, não só pelo valor unitário da ferramenta, mas também pelo tempo consumido na indesejável interrupção da operação. Atualmente, um dos importantes caminhos para o aumento da vida da ferramenta aponta para o desenvolvimento de materiais mais resistentes ao desgaste, como as pastilhas de nitreto cúbico de boro policristalino (PCBN). No entanto, o custo unitário destas ferramentas é consideravelmente alto... (Resumo completo, clicar acesso eletrônico abaixo)Abstract: One of the main of the metalworking industry is the increase of productivity in machining processes, which can be obtained through larger material removal rates. This requirement is associated to be cutting tool wear evolution, since the reduction of tool life increases the production costs, not only for unitary value of the tool, but also for the time consumed in the undesirable interruption of the operation. Nowadays, an important way to increase tool life is the development of more wear resistant materials, such as polycrystalline cubic boron nitride (PCBN) cutting tools. However, the unitary cost of these tools is considerably high, about 10 to 20 times more expensive that coated carbide tools. In addition its best performance occurs at high-speed machining, that demands modern machine tools. Many researchers have been using the technique of heating a workpiece layer immediately before its removal by the cutting tool in order to reduce the shear stress and to improve... (Complete abstract click electronic access below)
Orientador: Luiz Eduardo de Angelo Sanchez
Coorientador: Paulo José Amaral Serni
Banca: Alexandre Mendes Abrão
Banca: Vicente Luiz Scalon
Mestre
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Wade, Timothy Lawrence. "High power carbon based supercapacitors /." Connect to thesis, 2006. http://repository.unimelb.edu.au/10187/439.
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Energy storage devices are generally evaluated on two main requirements; power and energy. In supercapacitors these two performance criteria are altered by the capacitance, resistance and voltage. (For complete abstract open document)
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Bansal, Dinesh Gur Parshad. "Tribological investigation of electrical contacts." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31749.
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Thesis (Ph.D)--Mechanical Engineering, Georgia Institute of Technology, 2010.Committee Chair: Streator, Jeffrey; Committee Member: Blanchet, Thierry; Committee Member: Cowan, Richard; Committee Member: Danyluk, Steven; Committee Member: Neu, Richard; Committee Member: Thadhani, Naresh. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Varia, Adhyarth C. "In-Situ Capacity and Resistance Estimation Algorithm Development for Lithium-Ion Batteries Used in Electrified Vehicles." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1408665208.
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