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 38 for “"temperature dependency"”.
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Effects of temperature on the electrical impedance of piezoelectric elements
… impedance can also occur due to changes in temperature. Piezoelectric materials have been known to have temperature dependency regarding their basic properties, such as the dielectric constant and the piezoelectric coefficient. In this thesis, this temperature dependency will be …
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Mechanisches Verhalten metallischer Werkstoffe über weite Bereiche der Dehnung, der Dehnrate und der Temperatur
… strain rates up to high dynamic loading at temperatures from RT up to 400°C for the aluminium alloy respectively 800°C for the steel. For the examination of the mechanical behaviour compression tests have been conducted on cylindrical and square-shaped specimens. Both heat treatment …
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Analysis of deformation and tearing of uniformly blast-loaded circular and square plates rectangular beams and T-beams
… use material properties that include and exclude temperature dependency to model the plates and beams response and failure and finally to compare the numerical results with experimental results.
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Ultraschallerzeugende Mikrostrukturen für batterielose Fernbedienungen
… of the ultrasonic whistles are pressure and temperature dependent and deviate up to 10% from the respective average value. However, faulty signal identification due to pressure or temperature dependency can be eliminated by utilizing the ratio of the two signal frequencies. Furthermore, …
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Characterization of GaN MOS-HEMT trap-related effects for power switching applications
… of GaN MOS-HEMTs, such as the DC characteristic, temperature dependency, breakdown behavior and trap-related effects, were studied. Multiple customized measurement setups and configurations, including hardware and software, are discussed. We have estimated trap distribution using the capacitance …
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Struktūrinių intarpų kiekio safyro gardelėje temperatūrinė priklausomybė /
Temperature dependency on structural interspace quantity of sapphire in grating, is surveyed in this work. The size of the work is 38 pages. The paper consists of an introduction, two major parts, conclusions, a list of bibliography, and appendixes. There are 23 pictures enclosed. The theme, …
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Bestimmung der Materialparameter gefüllter Elastomere in Abhängigkeit von Zeit, Temperatur und Beanspruchungszustand
… expenditure using the application of time/temperature shifts (TTS) and amplitude/temperature shifts (ATS). In order to describe the time/temperature and amplitude/temperature dependent material behavior up to high deformations, an emphasis of the investigations is on the description of the …
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High Resolution Paleothermometry Using Biogenic Silica: A Feasibility Study
… these works have not strongly controlled for temperature, examined other forms of biogenic silica, or probed other parameters. Better controlled work by Sandford (2003) established that siliceous marine demosponge spicules undergo changes to their infrared absorbance spectra upon heating …
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Uncertainty analysis in a shipboard integrated power system using multi-element polynomial chaos
… uncertain, caused by a measurement difficulty, a temperature dependency, and random fluctuation of its environment. To date, there has been little if any studies which account for these stochastic effects in the large and complex shipboard power system from either an analytical or a numerical …
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Characterizing the Movement of Contaminant Liquid Metal Particles when subject to Electric Pulses, within the Context of Z-pinch Fusion Reactors
… are influenced by factors such as initial temperature, vacuum conditions, and electrostatic forces. This research provides crucial insights for optimizing reactor design and mitigating contamination in future fusion energy applications. The study also proposes directions for further …
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Characterization of Novel Pyroelectrics
… the spontaneous polarization due to a change of temperature is known as the pyroelectric effect and is restricted to crystalline, non-centrosymmetric and polar matter. Its main application is the utilization in infrared radiation sensors, but usage for waste heat energy harvesting or chemical …
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Ultra Low-Power Wireless Sensor Node for Structural Health Monitoring
… of wireless SHM sensor, and compensation of temperature dependency on impedance. The proposed design minimizes power by employing on-board signal processing, and by eliminating power hungry components such as ADC and DAC. The prototype implemented with MSP430 micro controller is verified to …
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Oriented polymer crystal growth from flowing solutions
… Crystallization was studied over a range of temperatures and flowrates and was found to always occur by a two-step process with a highly concentrated amorphous polymer phase forming first, followed later by crystallization. The kinetics were observed to follow the Avrami equation. The time …
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A Model of Transient Heat Transfer in a Packed Bed of Alumina Particles
… and investigating the effect of neglecting temperature dependency of materials properties. As the storage heat system has a vertical storage vessel, the dominant heat transfer mechanism from the boundaries of the vessel is free heat convection. In other words, there is no heat loss from the …
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Kinetic studies of solid-phase polycondensation in two polyamides and a polyester
The effects of polymer particle size, temperature, and time on the continued condensation of two polyamides: poly(hexamethylene adipamide) and poly(hexamethylene sebacamide), and a polyester, poly(ethylene terephthalate), were studied experimentally. The polyamides were held at elevated …
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The Chlorination of Triclosan: A Kinetic Study
… with respect to each species). No significant temperature dependency was observed from 8 to 25 °C. The reaction stoichiometry was determined to be 1:1 (triclosan oxidized per free chlorine reduced and did not vary over the pH range examined (pH 4-12). However, the reaction rate coefficients …
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High Temperature Characterization and Analysis of Silicon Carbide (SiC) Power Semiconductor Transistors
… of GE's SiC MOSFET proved to have the smallest temperature dependency, increasing by only 59 % from 25 ºC to 200 ºC. From the dynamic characterization, it was shown that Cree's C2M0080120D second generation SiC MOSFET achieved dv/dt rates of 57 V/ns. The SiC MOSFETs also featured low turn off …
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Deformation and tearing of uniformly blast-loaded quadrangular stiffened plates
… that uses material properties that include temperature dependency to model the plate response. The experimental procedure consists of creating an impulsive load with the use of plastic explosive and measuring the resulting impulse using a ballistic pendulum. Explosive is centrally laid out …
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CMOS current amplifiers : speed versus nonlinearity
… amplifiers resulting in exceptionally low temperature dependency of the logarithmic output signal. Additionally, along with this logarithmic amplifier a new current peak detectoris developed.
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Blast Resilience of Glazed Façades: Towards a New Understanding of the Post-Fracture Behaviour of Laminated Glass
… four-point bending tests are performed at low temperature on specimens pre-fractured before testing. The pre-fracture ensures controlled and repeatable fracture patterns, and the low temperature simulates the effects of the high strain-rates that result from short-duration blast loads by taking …
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