National Needs for Critically Evaluated Physical and Chemical Data

SummaryRussellite Bi2O3. WO3 occurs in a small pegmatite near Poona, Western Australia. The fine-grained yellow to pale green material is an inseparable mixture of russellite, bismite, koechlinite, and bismutite. X-ray powder diffraction, physical, and chemical data agree in general with the original description of the mineral from Cornwall, England. The original analyses made on micro quantities are now supplemented by analyses on macro quantities.

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Physical and chemical data of WS2 platelets and thickness-dependent photoresponses

Data in Brief ◽

10.1016/j.dib.2018.08.118 ◽

2018 ◽

Vol 20 ◽

pp. 1256-1262

Author(s):

Thanh Tai Nguyen ◽

Malkeshkumar Patel ◽

Dong-Kyun Ban ◽

Joondong Kim

Keyword(s):

Chemical Data ◽

Physical And Chemical

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TRUE AND APPARENT METABOLIZABLE ENERGY VALUES FOR POULTRY OF CANADIAN WHEATS AND OATS MEASURED BY BIOASSAY AND PREDICTED FROM PHYSICAL AND CHEMICAL DATA

Canadian Journal of Animal Science ◽

10.4141/cjas77-045 ◽

1977 ◽

Vol 57 (2) ◽

pp. 365-374 ◽

Cited By ~ 19

Author(s):

I. R. SIBBALD ◽

K. PRICE

Keyword(s):

Metabolizable Energy ◽

Chemical Data ◽

Accuracy And Precision ◽

Apparent Metabolizable Energy ◽

The Difference ◽

Variation Explained ◽

Predicted Values ◽

Naked Oats ◽

Physical And Chemical ◽

Better Than

Thirty samples of wheat and 28 samples of oats were assayed for true and apparent metabolizable energy (TME, AME). Within grains, the difference TME−AME increased with decreasing AME values; there is evidence that this trend is associated with reduced voluntary consumption of AME assay diets containing low energy grains. The TME and AME data were compared with ME values predicted from physical and chemical data describing the grains. Previously published prediction equations were tested and new equations were derived. Comparisons between predicted and observed data suggested that both the TME and AME values of wheat were predicted with insufficient accuracy and precision for practical use. Similar comparisons using the oat data showed high correlations between observed and predicted values, although the predictions were no more accurate than for wheat; however, when data describing four samples of naked oats were removed, the correlations were reduced substantially. Comparisons involving data for the hulled oats indicated that most equations were able to predict AME better than TME. Multiple regression analysis was used to identify those combinations of variables best able to predict TME data. No combination of variables was best for both wheat and oats. The combinations of variables used in published equations performed quite well. With four variables, the percentage of the TME variation explained was as high as 52 for wheat, 82 for oats and 64 for hulled oats. Predictions based on air-dry data are associated with higher correlations than those based on dry matter data, but the air-dry predictions are the less useful in practice. The reason for this is discussed.

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Esca. results versus other physical and chemical data

Journal of Electron Spectroscopy and Related Phenomena ◽

10.1016/0368-2048(74)85007-3 ◽

1974 ◽

Vol 5 (1) ◽

pp. 135-148 ◽

Cited By ~ 38

Author(s):

D.A. Shirley

Keyword(s):

Chemical Data ◽

Physical And Chemical

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Eggonite (Kolbeckite, Sterrettite), ScPO4 · 2H2O

Mineralogical Magazine ◽

10.1180/minmag.1982.046.341.15 ◽

1982 ◽

Vol 46 (341) ◽

pp. 493-497 ◽

Cited By ~ 6

Author(s):

M. H. Hey ◽

Charles Milton ◽

Edward J. Dwornik

Keyword(s):

Chemical Data ◽

Optical Data ◽

New Mineral ◽

Aluminium Phosphate ◽

Physical Data ◽

History Of ◽

Sulfur Springs ◽

Physical And Chemical ◽

New Occurrences

SynopsisThe curious history of the mineral eggonite is reviewed, and two new occurrences are described. The original specimens, for which Schrauf gave good morphological and optical data in 1879, with a tentative suggestion that it was a cadmium silicate, were fakes; the tiny crystals of the new mineral were glued on to hemimorphite specimens from Altenberg, Belgium. In 1929, Zimanyi edited and published observations by Krenner, who found the mineral on silver ores from Felsöbánya, Hungary, added to Schrauf's physical data, and identified it as an aluminium phosphate. It was not until 1959 that Mrose and Wappner showed that it is scandium phosphate, ScPO4 · 2H2O, and essentially identical with kolbeckite, described by Edelmann in 1926 as a phosphate and silicate of beryllium, aluminium, and calcium from Saxony, and with sterrettite, described by Larsen and Montgomery in 1940 as an aluminium phosphate from Fairfield, Utah.In 1980 the IMA Commission on New Minerals and Mineral Names, while accepting the identity of the three minerals and rejecting the name sterrettite, were almost equally divided over the names eggonite and kolbeckite, which are thus both acceptable; since eggonite has 47 years priority, we suggest that it should have preference.The available physical and chemical data on eggonite are summarized and added to, and two new occurrences, at Potash Sulfur Springs, Arkansas, and at Sakpur, Gujarat, India, are described.

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