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 33 for “"Input Energy"”.
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Estimation of Earthquake Input Energy, Hysteretic Energy and its Distribution in MDOF Structures
… in the earthquake engineering community, is the energy-based approach. In this approach, a design is considered satisfactory if the capacity of a structure to absorb or dissipate energy exceeds its energy demand from an earthquake. In the present research, a new energy-based approach is proposed …
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Disaggregated Seismic Hazard and the Elastic Input Energy Spectrum: An Approach to Design Earthquake Selection
… characterization of the hazard. The elastic input energy spectrum is an alternative to the elastic response spectrum for these types of analyses. The input energy combines the elements of amplitude and duration into a single parameter description of the ground motion that can be readily …
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An analytical study of dynamic response and nonequivalence of an absolute active cavity radiometer operating at cryogenic temperatures
… Steady-state relationships between radiative input energy from a uniform diffuse source field and temperature drop between the resistance thermometers and the heat sink are found to be linear. The steady-state sensitivity of the model to a diffuse input field, determined by relating electrical …
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Energy utilisation in South Africa.
… information: 1) The quantities and forms of input and useful energy used by different sectors of the South African economy. (The terms input energy and useful energy are defined in section 1.2 of this chapter). 2) The efficiency of conversion of input energy to useful energy. 3) Current and …
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Nonlinear forced response of circular cylindrical shells
… the breathing mode saturates) and the extra energy spills over into the flexural mode. In other words, although the breathing mode is directly excited by the load, it absorbs a small amount of the input energy (responds with a small amplitude) and passes the rest of the input energy into the …
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Modeling and Numerical Investigation of Hot Gas Defrost on a Finned Tube Evaporator Using Computational Fluid Dynamics
… of running time. It is one way to improve the energy efficiency of refrigeration systems. There are many studies about the defrosting process but none of them use computational fluid dynamics (CFD) simulation. The purpose of this thesis is (1) to develop a defrost model using the commercial CFD …
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Effect of HPGR on platinum bearing ores and the flotation response as compared to the conventional ball mill
… typically applied on these ore types are highly energy intensive with a small percentage of the input energy being used for actual breakage. Rapidly increasing energy costs have contributed to the rising interest of the HPGR in the platinum industry, particularly in plants processing UG2 and …
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On finite difference solutions for the ocean wave spectrum in regions of non-uniform water depth
… the actual values for a smooth distribution of input energy.
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Design and development of a novel DC/DC bidirectional converter with dual solar/PV-based snow removal and EV charging functionality
… solar photovoltaic (PV) systems by decreasing input energy and reducing the conversion efficiency of the system. One of these factors is the effect of snow cover on PV panels, a subject lacking sufficient academic research. This thesis reviews current research for snow removal in solar PV …
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Use of Permanent Magnets to Improve the Seismic Behavior of Light-Framed Structures
… seismic design approach. The main source of energy dissipation in such structures is the inelastic behavior of the connectors connecting framing and sheathing elements. Wood framed structures when subjected to strong ground excitations experience structural and non-structural damage which may …
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Measuring the fracture energy of bed breakage using a short impact load cell
… devices are highly inefficient, as the energy used for particle breakage relative to that consumed by the equipment is low and reported to be between 1-2 %. As such, understanding the fundamentals of particle fracture is crucial for the development of energy efficient particle size …
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Study of a Modified Friction Device for the control of civil structures
… vibrations created by transient loads input energy to the structure. Control devices can be used to dissipate this energy in a civil structure. In this research, a new semi-active dissipation device is studied: the Modified Friction Device (MFD). The MFD is a control device that …
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Mechanism and the Effect of Microwave-Carbon Nanotube Interaction
… the effects of phonon-phonon interactions and energy transfer from microwaves to CNTs. This result provides another way to input energy from microwaves to carbon nanotubes besides the usual Joule heating via electron-phonon interaction. This model appears to be the first to point out the role …
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Wire Direct Energy Deposition of Cobalt Iron Alloy
… research explores the Wire-Laser Direct Energy Deposition of Fe17Co alloy for soft magnetic applications. Process parameters starting from power, feed speed, and feed/scan ratios were optimized where a high confidence multi-factor regression model was developed correlating the processing …
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Genetic engineering of sorghum and switchgrass for improved biofuel production
Biofuels, energy sources generated from biomass, have been seen as a potential route to meet energy demand and avoid political instability and environmental issues worldwide. Switchgrass has been considered as an excellent feedstock for biofuels due to the high cellulosic content, wide adaptation …
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On-Chip Isotropic Microchannels for Cooling Three Dimensional Microprocessors
… a Reynolds number of 400, a Nusselt number per input energy (Nu/Q) of 0.24 W-1 was achieved. The micro-fin geometry is also capable of cooling a substrate with a heat flux of 100W/cm2 to 45ºC with a Reynolds number of 525. These channels also have a lower thermal resistance compared to external …
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Examination of the application and limitations of structural mode extraction via force apportionment
… given mode are arrived at by requiring that the input energy excite only the mode of interest while the net amount of work on adjacent modes is zero. This method is illustrated on a 24 in. x 1.5 in. x 0.375 in. steel beam. The fourth bending mode is to be separated from the first torsional mode …
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Processing rate and energy consumption analysis for additive manufacturing processes : material extrusion and powder bed fusion
… also suffers from slow production rate and high energy consumption. Improving the rate and energy becomes an important issue to make additive manufacturing competitive with conventional technologies. Among all the different limiting factors including printing strategy, heat transfer and …
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Effects of Laser Frequency and Multiple Beams on Hot Electron Generation in Fast Ignition
… to harnessing fusion power for the purpose of energy production in which a small deuterium-tritium capsule is imploded to about a thousand times solid density with ultra-intense lasers. In the fast ignition (FI) scheme, a picosecond petawatt laser pulse is used to deposit ∼10 kJ of energy …
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Developing a methodology for reducing diamond breakage within processing plant
… This establishes a relationship between specific input energy and degree of breakage that can be used for size reduction to minimise diamond breakage. Ceramic diamond simulants have been used in the process to identify areas that are more prevalent to diamond breakage. It was found that sections …
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