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 59 for “"Self heating"”.
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Heat requirement for chemically self-heating containers
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1976.
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Performance of phase change cementitious composites with self-heating capacity
… regulates temperature, combining it with active self-heating capabilities improves performance under varying temperature conditions. In experiments, the temperature of concrete increases by over 30 °C. The study also examines the electrical properties of the concrete using alternating-current …
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Substrate-dependent high-field transport and self-heating in graphene transistors
… electrostatic and heat sinking effects. Self-heating in GFETs causes current degradation (up to ~10-20%) in micron-sized devices on SiO2/Si but is reduced if the supporting insulator thickness is scaled down. The transient behavior of such FETs has thermal time constants in the range of …
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Self-heating control of edge emitting and vertical cavity surface emitting lasers
Self-heating leads to temperature rise of laser diode and limits the output power, efficiency and modulation bandwidth due to increased loss and decreased differential gain. The main heat sources in laser diode during continuous wave operation are Joule heating and free carrier absorption loss. To …
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Development of a Self-Heating Consolidation Procedure for 3D-Printed Continuous Wire Polymer Composite Laminates
… The consolidation procedure used resistive heating combined with hot-pressing to reduce the internal voids. Image processing of sample cross sections proved the void content in consolidated samples were 91.6% lower compared to unprocessed, while flexural tests found 5% and 12% higher …
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Study of silicon-on-insulator multiple-gate MOS structures including band-gap engineering and self heating effects
… scattering. All these aspects cause severe self–heating effects, that detrimentally impact the carrier mobility and therefore the saturation drive current for high–performance transistors; as a consequence, thermal device design is becoming a fundamental part of integrated circuit …
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Experimental and Theoretical Studies of Kinetics and Quality Parameters to Determine Spontaneous Combustion Propensity of U.S. Coals
… and techniques have been developed for studying self-heating of coal. Each of the methods has its unique characteristics and index for assessing the propensity of self-ignition. However, all the reasonable candidate factors causing spontaneous combustion could not be examined thoroughly by any …
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Machine Learning and Data-Driven Analysis of Thermal Runaway Characteristics in Lithium-Ion Batteries
… parameters such as onset temperature of self-heating (T1), onset temperature of thermal runaway (T2), maximum temperature during thermal runaway (T3) and mass loss. The investigation revealed that NCA cells are more prone to thermal runaway, exhibiting lower initial self-heating …
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Multiphysics Coupling Analysis of Indicator Gas Variations Induced by Coal Spontaneous Combustion in Longwall Goaf
Understanding the self-heating behaviour and distribution patterns of indicator gases within longwall goaf is critical for preventing coal mine spontaneous combustion (sponcom). In prior studies, coal self-heating temperature and variations of gas products are often analysed independently, making …
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A heterojunction bipolar transistor with stepwise allog-graded base : analysis, design, fabrication, and characterization
(cont.) features but the device self-heating turned out to be crucial for the longevity of the base micro-airbridges. The short lifetime of the base micro-airbridges was prohibitive for the realization of high frequency measurements. This work serves as the foundation for the implementation of …
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LATERAL POWER DEVICES AND TECHNOLOGIES FOR HIGH VOLTAGE INTEGRATED CIRCUITS
… than silicon oxide reduces the problems of self-heating considerably. However, due to increment in output capacitance of the device, switching losses increase with increase in k-value. Partial-Silicon On Insulator (PSOl) technology is a potential alternative to alleviate self-heating issue …
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Reliability Characterisation of III-Nitrides Based Devices for Technology Development
… degradation of AlGaN/GaN HEMTs, namely self-heating, charge trapping and strain, are required to be minimised; an important step before large-scale deployment can be attained. The strong coupling of these degradation mechanisms, under normal device operation, makes the quantitative …
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Structural health monitoring of polymer-matrix composites (PMCs) using embedded piezoelectric transducers: experimental and numerical approaches
… The experimental phase was started with the self-heating tensile tests conducted on the composite specimens to estimate their fatigue limit through the conventional method (using the Infrared Thermography technique, IRT) and an innovative approach employing the electrical embedded capacitance …
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Theory, Fabrication and Characterization of Micromachined Electrolytic Solution Conductivity Sensors
… gave a thermal resistance of 553°C/W during self-heating in water. With a RTD integrated on the sensor tip, temperature correction for conductivity can be made so that concentration could be measured locally in media with non-uniform temperature and concentration distributions. Finally, …
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Selective mode coupling in microring resonators for single mode semiconductor lasers
… for low threshold narrow linewidth laser diodes. Self-heating caused by material absorption changes the temperature and material refractive indices. The change in the refractive indices of the core and cladding of a reflective microring changes its reflection peak wavelength and the phase of its …
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INVESTIGATIONS OF OXIDE AND SULFIDE BASED LOW DIMENSIONAL NANO STRUCTURES FOR CONDUCTOMETRIC GAS SENSORS, MEMRISTORS AND PHOTODETECTORS
… observed measurements. Further, the effect of self heating in some nanostructures was also explored. Since self-heating is a prospective power-efficient energy delivery channel to the conductometric chemical sensors that require elevated temperatures for their operation, the unprecedentedly low …
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On Determining Spontaneous Ignition in Porous Materials
… dimensionless heat generation parameter for a self-heating body, is described in terms of two key material constants and these materials are related to real incident spontaneous ignition scenarios. The Damkohler number is compared to the critical Damkohler number, value of heat generation at …
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Large Signal HBT Model and Integrated Circuit Design Using 300-Ghz Indium Phosphide HBT Technology
… current blocking, velocity modulation and self-heating. Model is verified in terms of single devices and integrated circuits. Good fitting to the measured DC and high-frequency data from single HBTs is achieved. In terms of circuit verification, high-gain and wideband variable gain …
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