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 24 for “"Temperature ranging"”.
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Phosphoric acid as an eka-catalyst in the alkylation of pipe still vapors
… Physical conditions studied were (1) temperature ranging from 40 to 200°C., (2) length of run from six to eight hours, and (5) vapor feed rate from 100 to 200 eubie centimeters per minute. From the results obtained from this research, it is evident that pipe still vapors composed of …
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Comparative study of advanced heat pumps
… rejection or heat absorption space. A cool side temperature difference between 0 and 20{dollar}\sp\circ{dollar}C is investigated, and this temperature difference accounts for both thermal resistance and cooling load. An outside temperature ranging between 35{dollar}\sp\circ{dollar}C and …
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Calibration of YSZ sensor for the measurement of oxygen concentration in Lbe
… A set of calibration curves of voltage vs. temperature ranging from 300°C to 500°C under various oxygen concentrations in liquid LBE was obtained and presented here. A new improvised setup and instrumentation have also been developed to obtain more accurate results for a wide range of …
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Design and fabrication of the microcantilever heater for rapid chemical vapor deposition graphene synthesis
… nickel, are integrated into the heater region ranging from 5 by 5 μm to 20 by 12 μm in size. The microcantilever heater is thermally actuated by Joule heating. The fabricated device is able to operate at the graphene synthesis temperature, ranging from 800°C to 1000°C, for longer than an hour …
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Study of nonlinear microwave properties of high-temperature superconducting film
… possible origins of nonlinear properties of high-temperature superconducting films at microwave frequencies. The effect of patterning on the nonlinear microwave surface resistance of HTS films was studied by comparing the results of a dielectric-resonator technique and a stripline-resonator …
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Vanadium dioxide thermochromic thin films correlation between microstructure, electrical and optical properties
… to comparatively study the effect of deposition temperature on VO2 thin films microstructure, electrical and optical properties. Prior to the deposition, we first optimized the deposition conditions for both techniques. Optimized conditions were then used to systematically study the effect of …
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Modelling and Measurements on a Condensing Counter-Flow Heat Exchanger
… taken under a variety of conditions, with air temperature ranging from 18 to 26 degrees Celsius, water inlet from 13.5 to 21.7 degrees, R12 inlet temperature from 61.2 to 81.7 degrees and water mass flow rate from 6.7 to 32.9 grammes per second. A Fortran computer model of the condenser …
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Investigation of Torrefaction Process Parameters on Biomass Feed-Stock and CO2 Gasification of Torrefied and Pyrolysed Bio-char
… process, carried out at a relatively low temperature ranging from 200-300°C. This research focuses on torrefaction of flax straw at laboratory scale. A Thermo Gravimetric Analyzer (TGA) was used to study the effect of temperature, particle size and residence time on the torrefaction of …
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Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes
… state reaction techniques at various sintering temperature ranging from 700 to 1000 °C for 8 and 12 h respectively. Lithium carbonate (Li2CO3), titanium dioxide (TiO2), aluminium dioxide (Al2O3), tantalum oxide (Ta2O5) and ammonium dihydrogen phosphate (NH4H2PO4) of high purity grade were used …
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Mechanical Property Evaluation of Torrefied Biomass Materials with Correlation to Grinding Efficiency
… in the absence of oxygen at relatively low temperature ranging from 200-300°C. This mild treatment both increases the energy density and facilitates grindability by weakening the fibrous structure and tenacity of biomass. During the process the biomass also decreases in mass, but will …
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Physical and electrical properties of Li1+xTi2-xAlx(PO4)3 and Li1+2xTa1-xAlx+1(PO4)3 electrolytes
… state reaction techniques at various sintering temperature ranging from 700 to 1000 °C for 8 and 12 h respectively. Lithium carbonate (Li2CO3), titanium dioxide (TiO2), aluminium dioxide (Al2O3), tantalum oxide (Ta2O5) and ammonium dihydrogen phosphate (NH4H2PO4) of high purity grade were used …
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Performance and mechanism on a high durable silica alumina based cementitious material composed of coal refuse and coal combustion byproducts
… The results show that thermal activation temperature ranging from 20°C to 950°C significantly increases the workability and pozzolanic property of the coal refuse. The optimal activation condition is between 700°C to 800°C within a period of 30 to 60 minutes. Microanalysis illustrates that …
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Dispersal and connectivity of northeastern atlantic patellid limpets: a multidisciplinary approach
… December in P. rustica. The relationship between temperature and planktonic periods in P. depressa, P. ulyssiponensis, and P. vulgata was investigated with laboratory rearing experiments. Average duration of precompetent periods varied inversely with temperature, ranging between 3.7-14.0 days in …
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Detection of Illicit Drugs in Various Matrices Via Total Vaporization Solid-Phase Microextraction
… GHB, and GBL. The optimal extraction temperature ranging from 60-160°C of each drug will be discussed as well as why higher temperatures may not be suitable for this method. A limit of detection study for methamphetamine and amphetamine will also be covered. Chapter 5, the future work …
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Benchmarking of a sCO2 Heat Exchanger Flow Loop
… water jacket with an inner diameter of 12.7 mm. Temperature measurements were taken at 10 different axial locations along the test section, allowing for the calculation of local and average heat transfer coefficient under different boundary conditions. In addition to the experimental rig, a 1-D …
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Modeling the climatic sensitivity of the inception of the Fennoscandian Ice Sheet
… conclusion by analyzing how precipitation and temperature effect the growth of an ice sheet using two different sets of climate data. I use the Parallel Ice Sheet Model (PISM), a coupled ice sheet and ice shelf model, to simulate the mass balance and dynamics of the Fennoscandian Ice Sheet …
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Establishing the Conditions for Stable Extrusion of Melt Spun Polyacrylonitrile with Water Based Plasticizers
… the objective of establishment of conditions (temperature, plasticizer type, and plasticizer composition) that a PAN copolymer is able to be stable melt spun with water based plasticizers. More specifically, PAN/water/acetonitrile (70/15/15) mixture is considered as reference sample in this …
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Molecular Beam Epitaxy Synthesis and Characterization of Indium Selenide Films
… has been demonstrated. The effects of substrate temperature, substrate choice, and Se/In flux ratio during molecular beam epitaxy synthesis on the phase composition, surface morphology and stoichiometry of indium selenide films was investigated. Higher substrate temperature combined with higher …
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Hydrogen Production by Water Gas Shift Reaction Following Dry Reforming of Biogas Methane in Membrane and Packed Bed Tubular Reactors
… the amount of surfactant used and calcination temperature were also varied. Subsequently, the operating conditions were also varied including reaction temperature, steam/CO ratio and reactor pressure. An extended TOS stability test was performed for 12 hours to evaluate the continuous …
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