Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"Current stress"”.
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High voltage gain DC-DC converter using interleaved switching technique with PWM for current stress
… topology to boost-up voltage, the reduction of current stress at the switching devices cause the reduction of conduction loss and switching loss. The efficiency of the proposed converter will be compared by using interleaved switching technique and synchronous switching technique. Principally, …
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Design and analysis of current stress minimalisation controllers in multi-active bridge DC-DC converters.
… of DC transformers via the minimisation of current stresses. This is achieved by designing two generalised controllers that minimise current stresses in MAB DC transformers. The first controller is for a dual active bridge (DAB). This is the simplest form of MAB, where particle swarm …
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Contribution of Recharge Along Regional Flow Paths to Discharge at Ash Meadows, Nevada
… distances (160km) through fractures that, in the current stress field, should be closed in many instances in the presumed flow direction. This thesis examines several possible flow paths and evaluates each flow path using chemical and isotopic signatures in the water, as well as geologic and …
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Investigations of threshold effects in soil deformations
… affecting soil stiffness are identified as the stress history of samples, the current stress state and the current stress path. The effect of sample disturbance is to reduce measured stiffnesses, opinion has in the past attributed the differences in stiffness to this factor. However this is not …
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Design Automation for Reliable CMOS Chip Input/output Circuits
… mechanism during the Human Body Model (HBM) ESD stress. Previous circuit thermal model (integrator circuit) in iETSIM only applies for constant current stress. A general thermal model using convolution is developed. New techniques are proposed to implement a thermal convolver, including …
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Advanced Single-Stage Power Factor Correction Techniques
… power factor correction (VS-CPPFC) converters, current source CPPFC converters, combined voltage source current source (VSCS) CPPFC converters, and continuous input current (CIC) CPPFC converters. Integrated single-stage PFC converters are first developed, which combine the PFC converter with a …
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Single-switch bridgeless PFC sepic with proposed series-line-diodes-clamped configuration for data communication applications
… major drawbacks exist such as circulating current, capacitive coupling loop, more current stress at input capacitors and line-diodes, high total harmonic distortion of current (THDi), low power factor, dead zones, and high output voltage ripple. Therefore, a SSBPFC SEPIC structure with SLDC …
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Social Support Domains for Parents of Children with Autism Spectrum Disorder: Assessing Perceived Needs and Stress Levels
The current study investigated types of social support needs through a number of domains reported by parents of children with autism spectrum disorder (ASD) along with the relationship of these needs to reported parental stress. Female participants (N = 35) in the South Central Kentucky region …
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A computer-aided graphic design tool for minimum weight inductors in switching converters
… the total losses in the inductor and the peak current stress in the switching transistor and diode. Thus useful insight is obtained by bringing aspects of converter design into view. Practical core and magnetic material data from manufacturer's catalogs can be specified and the design optimized …
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Increasing productivity in graduate students fulfilling thesis requirements via tactile art
… a growing concern, particularly in relation to stress caused by procrastination. The student researcher hypothesized graduate and doctoral students would show increased productivity and decreased procrastination on thesis related work following a tactile-based art intervention. The student …
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Multiple Predictors of College Adjustment and Academic Performance for Undergraduates in Their First Semester
… research (e.g., Aspinwall & Taylor, 1994) and current stress-coping theory (Moos & Swindle, 1990). Structural equation modeling analyses indicated that the hypothesized model did not fit the data well. However, subsequent regression analyses did validate the view that college success is …
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Steady-State Time-Domain Analysis of LLCL Resonant Converter
… Voltage gain and resonant tank component current stress is derived, as a function of various circuit parameters such as the ratio of inductors and normalized relative frequency, to assist in the design trade-offs. The time domain analysis is verified with simulation studies using PSIM 11.0.
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Advanced Integrated Single-Stage Power Factor Correction Techniques
… To limit the undesirable power converter input-current-harmonic's impact on the power line and other electronics equipment, stringent current harmonic regulations such as IEC 61000-3-2 have already been enforced. The S2PFC techniques have been proposed and intensively studied, in order to comply …
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Accelerated thermal degradation testing of GAN HEMTs under high-temperature stress
… exposed to elevated temperatures and electrical stress over long durations. This study aims to investigate the degradation behavior of commercial EPC90122 GaN HEMT devices under controlled high-temperature operating conditions. Accelerated degradation testing is conducted by heating the devices …
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The role of learning in the development and maintenance of high- perception psychophysiological disorders
… assessing presence or absence of childhood and current high-perception disorders, childhood and current learning experiences, family prevalence of disorders, illness behavior, childhood and current stress, childhood family factors, depression, and anxiety. Multivariate F tests showed that …
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Implementation of ACR and AVR controls for high voltage gain DC-DC Converter
… from 4-stage, by multistage of converter the stress in the components will be reduced, where the parallel charging at input side to reduce the current stress, and series discharging at output to reduce the voltage stress. The stress on the components of the converter will inversely …
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Investigation of system-level ESD-induced failures
… of systems. ESD is a short duration, high current stress which can cause the permanent failure of a system or temporary glitches in a system. Soft failures include any recoverable system malfunction, from resets to loss of stored data. They can be caused by noise entering signal pins or by …
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Performance Improvement of Power Conversion by Utilizing Coupled Inductors
… with the coupled inductor induces severe voltage stress and loss. An innovative solution is proposed featuring with efficient leakage energy recovery and alleviated rectifier reverse recovery. Impressive efficiency improvement is achieved with a simple topology structure. The coupled inductor …
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Dissociating Roles for the Nucleus Accumbens Core and Shell in Priming-, Cue-, and Stress-Induced Reinstatement of Food-Seeking Behavior
… exposure to food-associated cues, or exposure to stress. Dietary relapse can be studied using an animal reinstatement model, and research has found that this operant responding behavior for rewards is differentially affected by manipulation of the nucleus accumbens subregions, the core and shell. …
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Vulnerability risk factors and physiological mechanisms underlying the relationship between stressor exposure and mental health outcomes during the perinatal period
Stress can confer risk for psychological disorders through intersecting neurophysiological pathways. Although numerous vulnerability-risk factors have been identified to increase risk for stress-related disorders, the mechanisms underlying the relationship between stressor exposure and mental …
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