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 86 for “"Low pressures"”.
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Sublimation at low pressures
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 1960
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Rates of evaporation of small drops at low pressures
… of radii of 0.5 - 2.0 microns and for a range of pressures of 0.5 - 10 cm Hg. An expression is derived for the rate of evaporation and is compared with the rates determined experimentally. From the method of approach, the degree of approximation of earlier treatments may be estimated. In the …
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Effect of Adsorption on the Measurement of Very Low Pressures
Made available in DSpace on 2014-12-05T19:16:03Z (GMT). No. of bitstreams: 1 6402901.pdf: 3688744 bytes, checksum: 5255a1591fc12387c12b81d638d91e95 (MD5) Previous issue date: 1963
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Physical adsorption of argon, krypton and nitrogen on iron and pyrex at very low pressures
… showed that Henry's Law behavior was reached at low coverages and high temperatures. Isosteric heats of adsorption were calculated for all systems. Isosteric heat versus coverage curves indicated that the Pyrex surface was heterogeneous and the iron surface was less heterogeneous. The magnitude …
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A study of the physical adsorption of nitrogen gas on polished 347 stainless steel at very low pressures
This investigation involves the study of the physical adsorption of nitrogen gas on a polished 347 stainless steel surface in the 1 x 10⁻⁹ to 1 x 10⁻⁷ torr pressure region. Characterization studies on the polished 347 stainless steel surface were also conducted utilizing a scanning electron …
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Shear relaxations of confined liquids
… wall slip were observed at large strains even at low pressures.
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The development of an optically active laser Schlieren system with application to high pressure solid propellant combustion
… perchlorate deflagration was observed to pressures of 2500 psi. Distinct surface reaction sites were evidenced in the gas phase at high and low pressures by alternating density gradients across the surface. These sites were found to be very small or nonexistent at intermediate pressures.
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Petrogenesis of the peralkaline granite (and associated syenite) dykes of the Straumsvola Complex, Western Dronning Maud Land, Antarctica
… given the thermal divide that exists at low pressures between silica-under and -oversaturated phases. Major and trace element variations in the dykes are found to be consistent with fractional crystallisation of a parental peralkaline magma of trachyte composition.
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Nucleation during boiling, with special reference to its cessation at low pressure
… regime, noted in preliminary tests conducted at low pressures.
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THE CONCENTRATION OF HYDROGEN IN INCOMPLETELY AND WHOLLY MELTED TERRESTRIAL BUILDING BLOCKS
… extrapolating high pressure experimental data to low pressures. I conduct olivine–melt H partitioning experiments at low pressures (10 – 200 MPa) and find that the olivine-melt H partition coefficient increases at low pressures, contrary to extrapolation from high pressure data. This observation …
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Stability and Dynamics of Apocytochrome B(562)
… shows a significant positive volume change at low pressures (<200 bar) suggesting the presence of a highly mispacked open state at ambient pressure. These observations place a significant restraint upon the type of folding pathway that is operative for this protein and suggest that that the N- …
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Foam-surfactant technology in soil remediation
… as a fluid to enhance soil remediation under low pressures compared to other fluids such as liquid surfactant solutions.
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Pressure and temperature dependence of myoglobin kinetics
… states is used to explain the process below 200K. Tne distribution of activation enthalpies is derived from the data at high and low pressures. We determine that the influence of pressure on reaction kinetics below 200K is due to structural changes of the protein. The kinetics at higher …
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Characterization of PET samples processed in an RF oxygen discharge
… generated in a pure oxygen process atmosphere at pressures of 100 mTorr, and 2.0 Torr at output powers of 250 Watts and 500 Watts.</p> <p>Optical emission spectroscopy (OES) was used to characterize the plasma/sample interaction. Spectra were measured from 250 nm to 900 nm during each of the …
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In situ Raman spectroscopy of pressure-induced phase transformations in DyPO₄ and GdxDy(1-x)PO₄
… been studied at ambient temperature under high pressures inside a diamond anvil cell with in situ Raman spectroscopy. The Raman active modes of the xenotime structure were observed at low pressures and the appearance of new Raman peaks at higher pressures indicate a phase transformation to a …
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Analysis of Respiratory Time Series Data for Breathing Discomfort Detection Prior to Sleep Onset During APAP Therapy
… stuffiness from pressure levels that is lower than tolerable for some patient preferences. This thesis seeks to explore which patterns in the high-resolution breathing data from ResMed devices may be used to identify patients who are experiencing breathing discomfort at low pressures at …
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Mercury Photosensitized Oxidations in the Gas Phase
… in a microwave discharge through oxygen at low pressures. Comparison of the results showed that the presence of neither singlet oxygen molecules nor oxygen atoms alone was sufficient to account for the observed products of the mercury-sensitized oxidations. In fact, it was necessary to …
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Deterministic and stochastic modelling of a catalytic surface reaction
… the use of different model types. While at low pressures in the gas phase the system can be described by a deterministic model in the form of ordinary or partial differential equations, a stochastic particle model is needed at higher pressures due to rising fluctuations. A numerical …
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Thermal conductivity of liquid helium three
… the thermal conductivity of liquid He3 at low pressure from O. 055 0 K to O. 47 o K, at 99.8 psi from O. 0550 K to O. 750 K and at 396.8 psi from O. 0550 K to O. 87 o K. At all pressures and at sufficiently low temperatures the thermal conductivity increases with decreasing temperature. At …
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