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Showing 1 to 20 of 753 for “"Impurities"”.
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Transitional impurities in liquid copper
… is found to be decreased by dissolved transition impurities with the maximum decrease of about 20% for each atomic percent of impurity occurring in the Cu-Mn solutions. The change caused by magnetic impurities in the copper Knight shift is found to depend inversely on temperature. We have analyzed …
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Dynamics of impurities and trapped Bose-Einstein Condensates
… designing the confinement of tightly trapped impurities in a BEC reservoir to study their dissipative dynamics, and to study non-equilibrium dynamics of BECs confined in a tilted ring trap (both with ultracold atoms and polaritons).;In the first part we explore tightly confined impurities, …
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Transmission and ellipsometric spectroscopy of impurities in metals
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T18:01:14Z No. of bitstreams: 1 1982_denton.pdf: 5959168 bytes, checksum: 7e03456f1529061a5f3c7a4102ebfd74 (MD5)
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Spin-flip scattering of conduction electrons from impurities
… of a new type of experiment, the effect of impurities on the spin orientation lifetime of conduction electrons. We have made a theoretical and experimental study of the effect of non-magnetic elemental impurities on the conduction electron spin resonance (CESR) in metals. By measuring the …
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Impurities in crystals formed by eutectic freeze crystallization
A large concern facing South African industry, particularly the mining sector, is a suitable and sustainable means to deal with large volumes of liquid waste, comprised mostly of effluent water streams containing a variety of dissolved salts. A novel technique is being developed for the treatment …
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The electron distribution function and impurities in alcator.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Physics, 1979
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Characterization of shallow impurities in high-purity gallium arsenide and indium phosphide using photothermal ionization spectroscopy: Nonequilibrium incorporation of amphoteric impurities
… and amphoteric behavior of Group IV impurities in high purity gallium arsenide (GaAs) and indium phosphide (InP) grown by various growth techniques have been quantitatively studied by employing the characterization techniques, Hall-effect measurements, photothermal ionization …
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Controlling trace impurities in a dividing wall distillation column
Dividing wall distillation columns (DWCs) separate a feed mixture into three pure product streams using one column shell. Though attractive due to capital and operational savings, DWCs have yet to gain widespread industrial acceptance. One notable concern is controllability. The research within …
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Influence of impurities on the crystallisation of pharmaceutical materials
… drug production process. Acceptable levels for impurities in drugs are defined in official regulations released by the International Conference of Harmonisation (ICH), the United States Food and Drug Administration (FDA) and the Canadian Drug and Health Agency (CDHA). A liquid …
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Influence of defects and impurities on solar cell performance
Multicrystalline silicon (mc-Si) solar cells exhibit high impurity content and higher density of crystal defects such as grain boundaries, dislocations, stacking faults and impurity precipitates. Even though the effect of dislocations on mc-Si solar cell performance has been studied, a severe lack …
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Studies of impurities in crystalline pharmaceuticals and related compounds
The occurrence of and management of impurities in batches of drug products is a constant challenge faced by chemists in the pharmaceutical industry. While the inclusion of many process related impurities can be controlled and removed to safe levels and levels specified by regulatory bodies by …
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Optical Characterization of Defects and Impurities in Gallium Nitride
Photoluminescence was used to measure the bandgap of GaN as a function of temperature in the range 2--811 K, and the results were fitted to Varshni's empirical formula to obtain an expression for the dependence of the energy gap of GaN on temperature which should be generally applicable to most …
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Optical Studies of Rare Gas Impurities in Alkali Metals
Made available in DSpace on 2015-05-12T22:39:11Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7511802.PDF: 4165954 bytes, checksum: 0de9c0bb1c1b04d3b220214fa8dc494b (MD5) Previous issue date: 1974
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Phonon Scattering From Monovalent Substitional Impurities in Sodium-Chloride
Made available in DSpace on 2015-05-12T21:41:38Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6706575.PDF: 5658503 bytes, checksum: 1d93c1d7a8e68458317689bffdd8e75e (MD5) Previous issue date: 1966
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The Effect of Pressure on Impurities in Alkali-Halides
Made available in DSpace on 2015-05-12T17:04:33Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6001640.PDF: 5948538 bytes, checksum: df165285b4b116732dd7e0b0335b346d (MD5) Previous issue date: 1960
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Optical Studies of Rare Gas Impurities in Alkali Metals
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2012-01-09T21:42:07Z No. of bitstreams: 1 1974_tilton.pdf: 4324042 bytes, checksum: 231302e618becf1a28c904a0d79f7881 (MD5)
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Electromagnetic penetration depth in superconducting alloys containing magnetic impurities
Measurements of the attenuation of an axial magnetic field by cylindrical, thin, superconducting films were made by using a SQUID-based magnetometer. The sample films were between 40 and 85 A thick. They were composed of indium and of indium containing a small amount of gadolinium. Each film was …
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Phonon scattering from monovalent substitutional impurities in sodium chloride
… scattering fl;'om monovalent substitutional impurities in sodium chloride using thefmal conductivity measurements as a tool. Similar work by other investi~ators on other alkali halides has shown that these defects scatter more strongly than the present theories allow. The eight impurities …
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Lattice dynamics of zinc blende crystals with point impurities.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Nuclear Engineering, 1972
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