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Articles 1 - 13 of 13
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Ground- And Excited-State Properties Of Solid Argon Under Pressure, Richard Alan Lesar
Ground- And Excited-State Properties Of Solid Argon Under Pressure, Richard Alan Lesar
Richard Alan Lesar
A self-consistent perturbation model for calculating the ground- and excited-state electronic properties of molecular and rare-gas crystals is presented. A tight-binding approximation is used, in which the effects of the crystal potential, calculated with local-density functionals, are included as a perturbation on the molecules (or atoms). The molecular (atomic) wave functions are then computed from standard Hartree-Fock theory. For the case of solid argon under pressure, a decrease in atomic volume causes a gain in free energy, which is partially balanced by the energy required to compress the atom. Calculated exciton energies for Ar disagree by only 2.5% with experimental …
Polarizability And Quadrupole Moment Of A Hydrogen Molecule In A Spheroidal Box, Richard Alan Lesar, D. R. Herschbach
Polarizability And Quadrupole Moment Of A Hydrogen Molecule In A Spheroidal Box, Richard Alan Lesar, D. R. Herschbach
Richard Alan Lesar
The polarizability and quadrupole moment of a hydrogen molecule enclosed within an infinite-walled spheroidal box are calculated as functions of the hox size, for a range corresponding to nominal pressures up to lo5 kbar. A five-term James and Coolidge variational wave function is employed and the Kirkwood approximation is used for the polarizability. Comparison is made with similar calculations for the H2+ molecule-ion and the II atom, and also with recent density-functional calculations. The box model proves to greatly exaggerate the compression of the H2 bond with pressure but nonetheless yields a realistic correlation of vibrational frequency with internuclear distance. …
Turbine Blade Image Processing System, Neal S. Page, Wesley E. Snyder, Sarah A. Rajala
Turbine Blade Image Processing System, Neal S. Page, Wesley E. Snyder, Sarah A. Rajala
Sarah A. Rajala
A vision system has been developed at North Carolina State University to identify the orientation and three dimensional location of steam turbine blades that are stacked in an industrial A-frame cart. The system uses a controlled light source for structured illumination and a single camera to extract the information required by the image processing software to calculate the position and orientation of a turbine blade in real time.
Soymilk Process, Lawrence A. Johnson, William J. Hoover, Charles W. Deyoe
Soymilk Process, Lawrence A. Johnson, William J. Hoover, Charles W. Deyoe
Lawrence A. Johnson
This invention relates to a process for making a soybean-based milk analog or soymilk and food products prepared therefrom. The process involves the comminuting of whole soybeans having the hulls thereon, forming a slurry of the comminuted soybeans, simultaneously initiating the inactivation of trypsin inhibitor and lipoxygenase without fixing protein bodies or substantially denaturing the soybean protein, confining the heated slurry until the trypsin inhibitor activity is reduced to a desired value, cooling the slurry, and separating the hulls from the slurry to recover the desired product. The resulting soymilk is an aqueous preparation of the soybean which exhibits minimal …
Decomposition Rates, Synthesis, And Spectral Properties Of A Series Of Alkyl Hyponitrites, Craig A. Ogle, Steve W. Martin, Michael P. Dziobak, Marek W. Urban, G. David Mendenhall
Decomposition Rates, Synthesis, And Spectral Properties Of A Series Of Alkyl Hyponitrites, Craig A. Ogle, Steve W. Martin, Michael P. Dziobak, Marek W. Urban, G. David Mendenhall
Steve W. Martin
A number of trans-alkyl hyponitrites (RON=NOR) were synthesized and characterized. At 66.1 f 0.1 "C in isooctane and with millimolar to micromolar concentrations first-order kinetics were observed with half-lives (min) of 12.8 f 0.2 (CHJ, 32.3 f 1.1 (2-C3H7), 15.0 1 0.3 (cyclohexyl), 25.2 i 1.2 (tert-butyl), 18.3 f 0.3 (tert-pentyl), 3.0 f 0.1 (benzyl), 11.2 f 0.5 (2-phenylethyl), and 5.5 f 0.3 (1-phenylethyl). The rate constants were concentration independent and showed little change with changes in solvent polarity or viscosity. Ultraviolet, magnetic resonance, infrared, and mass spectra for the new hyponitrites are reported. Most of the hyponitrites were highly …
Process For The Preparation Of Protein Isolates Of Improved Quality From Vegetable Protein Sources Using Alkali Metal Borohydrides, Lawrence A. Johnson, Hwei-Mei Wen
Process For The Preparation Of Protein Isolates Of Improved Quality From Vegetable Protein Sources Using Alkali Metal Borohydrides, Lawrence A. Johnson, Hwei-Mei Wen
Lawrence A. Johnson
Protein isolates are recovered from vegetable protein sources, such as for example sunflower meal, by extracting the meal with an alkali solution in the presence of an alkali metal borohydride, and then acid precipitating the resulting aqueous protein extract phase to produce a protein isolate. Typically, the alkali metal borohydride is employed in an amount of at least about 20 ppm, based on the combined weight of vegetable meal and alkali solution. Protein isolates produced by this process exhibit improved color, palatability and/or nutritional value, and comprise highly desirable additives for food products, animal foods, etc
Ab Initio Studies Of Abstraction Reactions Xhn + Hydrogen (H2) → Xhn+1 + Hydrogen (H) (X = Carbon, Nitrogen, Silicon, Or Phosphorus), Mark S. Gordon, David R. Gano, Jerry A. Boatz
Ab Initio Studies Of Abstraction Reactions Xhn + Hydrogen (H2) → Xhn+1 + Hydrogen (H) (X = Carbon, Nitrogen, Silicon, Or Phosphorus), Mark S. Gordon, David R. Gano, Jerry A. Boatz
Mark S. Gordon
The abstraction reactions CH3 + H2 --+ CH4 + H, SiH3 + H2 --+ SiH4 + H, NH2 + H2 --+ NH3 + H, and PH2 + H2--+ PH3 + H have been studied with a variety of methods, including MCSCF, POL-CI, UMP2, and UMP3. In agreement with the observed thermochemistry, abstraction by methyl radical is found to proceed more easily than by silyl, and the reverse of the last reaction occurs with a very small ( ~ 5.6 kcal/mol) barrier. POL-CI appears to be a consistently reliable approach for this type of reaction.
Are The Silacyclopentadienyl Anion And The Silacyclopropenyl Cation Aromatic?, Mark S. Gordon, Philip Boudjouk, Freidun Anwari
Are The Silacyclopentadienyl Anion And The Silacyclopropenyl Cation Aromatic?, Mark S. Gordon, Philip Boudjouk, Freidun Anwari
Mark S. Gordon
Stabilization energies attributable to aromaticity in the silacyclopentadienyl anion and the silacyclopropenyl cation were found to be small in the former and absent in the latter when calculated from bond-separation reactions employing 3-21G and ST0-2G basis sets. The silacyclopentadienyl anion is approximately 25% as aromatic as the all-carbon analogue whereas silabenzene is more than 80% as aromatic as benzene. The introduction of diffuse functions into the basis sets has only a small effect on these results. The silacyclopropenyl cation is actually destabilized but strain is probably a key factor in the comparison. Also found was that the ST0-2G basis set …
Extraction And Partial Characterization Of The Glycine Decarboxylase Multienzyme Complex From Pea Leaf Mitochondria, G. Sarojini, David J. Oliver
Extraction And Partial Characterization Of The Glycine Decarboxylase Multienzyme Complex From Pea Leaf Mitochondria, G. Sarojini, David J. Oliver
David J. Oliver
Glycine decarboxylase has been successfully solubilized from pea (Pisum sativum) leaf mitochondria as an acetone powder. The enzyme was dependent on added dithiothreitol and pyridoxal phosphate for maximal activity. The enzyme preparation could catalyze the exchange of CO2 into the carboxyl carbon of glycine, the reverse of the glycine decarboxylase reaction by converting serine, NH4+, and CO2 into glycine, and 14CO2 release from [1-14C]glycine. The half-maximal concentrations for the glycine-bicarbonate exchange reaction were 1.7 millimolar glycine, 16 millimolar NaH14CO2, and 0.006 millimolar pyridoxal phosphate. The enzyme (glycine-bicarbonate exchange reaction) was active in the assay conditions for 1 hour and could …
Genetic Divergence Within The Genus Liriodendron (Magnoliaceae), Jonathan F. Wendel, Clifford R. Parks, Norton G. Miller, Karen M. Mcdougal
Genetic Divergence Within The Genus Liriodendron (Magnoliaceae), Jonathan F. Wendel, Clifford R. Parks, Norton G. Miller, Karen M. Mcdougal
Jonathan F. Wendel
The genus Liriodendron L. consists of a southeast Asian-eastern North American disjunct species pair, but the genus had a much wider distribution in the Northern Hemisphere during the late Cretaceous and the Tertiary. Although generally similar in morphology, the two extant species are measurably different. In 1973 and 1977 they were hybridized, and interspecific heterosis was observed in the progeny. After seven years, the interspecific hybrids synthesized in 1973 had a significantly greater biomass than intraspecific hybrids of L. tulipifera. The growth rate of interspecific and intraspecific F2 seedlings was approximately equal. A preliminary survey of flavonoid extracts in L. …
Density‐Functional Theory For Solid Nitrogen And Carbon Dioxide At High Pressure, Richard Alan Lesar, R. G. Gordon
Density‐Functional Theory For Solid Nitrogen And Carbon Dioxide At High Pressure, Richard Alan Lesar, R. G. Gordon
Richard Alan Lesar
Structural properties of solid N2 and CO2 under pressure have been studied with a recently reported theory. The model allows for calculation of the structure and dissociation energy of molecular crystals, using no empirical parameters where dispersion energy is included as a sum of the pair interactions. Comparison with available low temperature experimental results shows good agreement with average errors in lattice constants of about 1% and in lattice energies of about 6%. Calculations were performed on nitrogen in a number of structures, including the experimentally observed P a3 (α), P42/m n m (γ), P63/m m c (β), and P …
Equation Of State Of Fluid Nh3 From P-V-T And Ultrasound Measurements To 12 Kbar, R. L. Mills, D. H. Lienbenberg, Richard Alan Lesar, Ph. Pruzan
Equation Of State Of Fluid Nh3 From P-V-T And Ultrasound Measurements To 12 Kbar, R. L. Mills, D. H. Lienbenberg, Richard Alan Lesar, Ph. Pruzan
Richard Alan Lesar
A piston-cylinder apparatus was used to measure the pressure, volume, temperature, and ultrasonic velocity (P,V,T,u) of fluid NH3 from 195 to 320 K at pressures up to 12 kbar. Over 1200 sets of P-V-T-u and P-V-T data were fitted to a Tait-type equation of state (EOS) by non-linear least-squares minimization. With quadratic terms in T for the two fitted parameters, the rms deviation is ± 0.2% in V and ± 0.9% in u, which is comparable to the experimental error. The simple Tait EOS is useful over the entire fluid range between the vaporization and melting curves up to T …
Recognition Of Student Input In Computer-Assisted Language Learning, Carol Chapelle, Joan Jamieson
Recognition Of Student Input In Computer-Assisted Language Learning, Carol Chapelle, Joan Jamieson
Carol Chapelle
Computerized instruction has captured the interest of many educators as a means of individualizing language study for their students. The quality of this individualization is maximally dependent on the degree to which a computer can understand what the student communicates to it usually by typing a message on the keyboard. This article provides an overview of this student communication, or input: its types, its recognition, and some uses of its recognition. A general understanding of the potential of student-computer interaction will enlighten those who are examining Computer Assisted Language Learning (CALL) lessons for use in their curriculum. Some of this …