scholarly journals Water adsorption at zirconia: from the ZrO2(111)/Pt3Zr(0001) model system to powder samples

2018 ◽  
Vol 6 (36) ◽  
pp. 17587-17601 ◽  
Author(s):  
Peter Lackner ◽  
Jan Hulva ◽  
Eva-Maria Köck ◽  
Wernfried Mayr-Schmölzer ◽  
Joong Il J. Choi ◽  
...  
Keyword(s):  
Powder Material ◽  
Computational Methods ◽  
Water Adsorption ◽  
Model System ◽  
Adsorption And Desorption ◽  
Zirconia Film ◽  
Powder Samples ◽  
Good Agreement ◽  
Comprehensive Study

A comprehensive study of water adsorption and desorption on an ultrathin trilayer zirconia film by experimental and computational methods shows good agreement with data for H2O/ZrO2 powder material.

Water Adsorption and Desorption Kinetics on Silica Insulation

1996 ◽  
Vol 180 (1) ◽  
pp. 276-284 ◽  
Author(s):  
A. Feng ◽  
B.J. McCoy ◽  
Z.A. Munir ◽  
D.E. Cagliostro
Keyword(s):  
Water Adsorption ◽  
Desorption Kinetics ◽  
Adsorption And Desorption

Analysis of Rotenone in Cube and Derris Root Powders and Formulations by Liquid Chromatography

1988 ◽  
Vol 71 (2) ◽  
pp. 323-324
Author(s):  
Rodney J Bushway ◽  
Angela Yang ◽  
Ali AL-Yamany
Keyword(s):  
Liquid Chromatography ◽  
Mixed Solvent ◽  
Array Detector ◽  
Photodiode Array Detector ◽  
Coefficients Of Variation ◽  
Powder Samples ◽  
Photodiode Array ◽  
Aoac Official ◽  
Liquid Chromatographic ◽  
Good Agreement

Abstract A modified liquid chromatographic (LC) procedure, including an improved extraction, has been developed to analyze rotenone in root powders of derris and cube. The procedure is also applicable to formulations. Samples are sonicated for 5 min in chloroform or a mixed solvent of tetrahydrofuran-acetonitrile-water-glacial acetic acid, followed by liquid chromatography. Rotenone content of 4 lots of root powder samples showed good agreement between the new extraction and the AOAC official extraction; coefficients of variation ranged from 5 to 1.2%. Five formulations were also analyzed and showed good agreement with results for methanol extraction. Coefficients of variation were 4.5% or less. Purity of the rotenone peaks was tested by using a photodiode array detector in the spectrum and UV ratio modes. It is recommended that the new method be tested collaboratively.

Concentration dependence of Debye temperature in mixed K x Rb1−x Cl

1992 ◽  
Vol 25 (2) ◽  
pp. 309-310 ◽  
Author(s):  
J. Bashir ◽  
M. M. Beg ◽  
N. M. Butt ◽  
Q. H. Khan ◽  
M. Nasir Khan
Keyword(s):  
Debye Temperature ◽  
Concentration Dependence ◽  
Neutron Spectrometer ◽  
Thermal Diffuse Scattering ◽  
Debye Temperatures ◽  
Powder Samples ◽  
Integrated Intensities ◽  
Thermal Diffuse ◽  
Temperature Factors ◽  
Good Agreement

Integrated intensities of Bragg reflections were measured with a triple-axis neutron spectrometer for powder samples of K x Rb1−x Cl for x = 0.5. The temperature factors were corrected for thermal diffuse scattering (TDS) and static contributions. The Debye temperature and the mean temperature factors obtained from these measurements are compared with the values obtained by other techniques and are found to be in good agreement. The Debye temperatures for RbCl (x = 0) and KCl (x = 1) determined by other authors were combined with these results and the concentration dependence of Θ in K x Rb1−x Cl, was found to be non-linear.

Noncontinuum Gas-Phase Heat Transfer From a Heated Microbeam to the Adjacent Substrate

2005 ◽  
Author(s):  
M. A. Gallis ◽  
J. R. Torczynski ◽  
D. J. Rader ◽  
B. L. Bainbridge
Keyword(s):  
Heat Transfer ◽  
Gas Phase ◽  
Computational Methods ◽  
Direct Simulation Monte Carlo ◽  
Navier Stokes ◽  
Temperature Jumps ◽  
Thermal Actuation ◽  
Accommodation Coefficients ◽  
Low Pressures ◽  
Good Agreement

Noncontinuum gas-phase heat transfer in two microscale geometries is investigated using two computational methods. The motivation is microscale thermal actuation produced by heating-induced expansion of a near-substrate microbeam in air. The first geometry involves a 1-μm microgap filled with gas and bounded by parallel solid slabs. The second geometry involves a heated I-shaped microbeam 2 μm from the adjacent substrate, with gas in between. Two computational methods are applied. The Navier-Stokes slip-jump (NSSJ) method uses continuum heat transfer in the gas, with temperature jumps at boundaries to treat noncontinuum effects. The Direct Simulation Monte Carlo (DSMC) method uses computational molecules to simulate noncontinuum gas behavior accurately. For the microgap, the heat-flux values from both methods are in good agreement for all pressures and accommodation coefficients. For the microbeam, there is comparably good agreement except for cases with low pressures and near-unity accommodation coefficients. The causes of this discrepancy are discussed.

Results of X-Ray Powder Diffraction Round Robin Tests with Corundum Plates and Powder Samples

1995 ◽  
Vol 39 ◽  
pp. 571-577
Author(s):  
V. Valvoda ◽  
D. Rafaja ◽  
R. Jenkins
Keyword(s):  
Powder Material ◽  
Powder Diffraction ◽  
Round Robin ◽  
Specimen Preparation ◽  
Round Robin Test ◽  
X Ray ◽  
Intensity Measurements ◽  
Powder Diffractometer ◽  
Powder Samples ◽  
Line Positions

Repetitions of the round robin test on powder diffractometer sensitivity and round robin test of intensity measurements, using two almost identical groups of participants, enabled a comparison to be made of results obtained in different tests. Two forms of corundum test samples were used: (i) sintered plates in tests A8 and A9, and (ii) powder samples in test Bl . A rough comparison of the influence of different methods of specimen preparation from the powder material in different laboratories in test Bl is thus possible with respect to the (almost) uniform sintered plates used in tests A8 and A9. The parameters under investigation were the line positions (and/or inter-planar d-spacing) and intensities of eleven reflections occurring at the 20 angles ranging from 25° to 136° for Cu Kα-radiation

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