scholarly journals A New Opacity-Sampling Model Atmosphere Program for Arbitrary Abundances

1993 ◽  
Vol 138 ◽  
pp. 87-97 ◽  
Author(s):  
Robert L. Kurucz
Keyword(s):  
Distribution Function ◽  
Energy Level ◽  
Lower Energy ◽  
Van Der Waals ◽  
Model Atmosphere ◽  
Function Model ◽  
Elemental Abundances ◽  
Lower Energy Level ◽  
Molecular Lines ◽  
Ap Stars

AbstractI have developed a new version of my model atmosphere program called ATLAS12. It recognizes more than 1000 species, each in up to 10 isotopic forms, including all ions of the elements up through Zn and the first 5 ions of heavier elements up through Es. The elemental abundances are treated as variable with depth. ATLAS12 has 6 input files of line data containing 58,000,000 atomic and molecular lines. For each line the wavelength, identification, lower energy level, gf, radiative, Stark, and van der Waals damping constants are packed into 16 bytes. At each wavelength point in a frequency integration the profiles of all the significant nearby lines are computed and summed. The program and line files will be distributed in the fall of 1992.There are no significant differences at A0 between an opacity-sampled model computed with ATLAS12 and opacity-distribution-function model computed with ATLAS9. ATLAS12 allows arbitrary abundances but is slower. The new program can be used to produce improved models for Am and Ap stars that include the effects of millions of lines.

Measurements of Sc I gf -values

1976 ◽  
Vol 351 (1667) ◽  
pp. 569-579 ◽  
Keyword(s):  
Energy Level ◽  
Heat Pipe ◽  
Lower Energy ◽  
Ground Term ◽  
Absolute Scale ◽  
Lower Energy Level ◽  
The Absolute

By means of a ‘heat pipe’ and the ‘hook method’ the gf -values for 98 transitions in neutral scandium between 200 and 650 nm have been measured. Of these transitions, 33 are unclassified lines that occur in pairs with the lower energy level identified, and 14 are unclassified but are believed to originate from one of the two levels of the ground term. The absolute scale of gf -values has been based on the measurements of Bell & Lyzenga (1976). We have compared our values to those in the literature.

Effects of different protein and energy levels on the performance of growing and finishing turkeys in the tropics

1981 ◽  
Vol 97 (3) ◽  
pp. 629-632
Author(s):  
J. M. Olomu ◽  
S. A. Offiong ◽  
S. Abed
Keyword(s):  
Weight Gain ◽  
Energy Level ◽  
Feed Efficiency ◽  
Lower Energy ◽  
Energy Levels ◽  
Metabolizable Energy ◽  
Feed Consumption ◽  
Lower Energy Level ◽  
Similar Weight ◽  
The Tropics

SUMMARYThree experiments were conducted to assess the effects of different protein and energy levels on turkeys during the periods 12–16 weeks, 16–20 weeks and 20–24 weeks. Compared with 20 and 22% protein, 18% significantly depressed weight gain and feed efficiency during the 12–16 weeks period, while 14 and 16% protein, compared with 18%, significantly depressed weight gain and feed efficiency during the 16–20 weeks period but gave similar weight gain and feed efficiency as the 18% protein during the 20–24 weeks period.During all periods between 12 and 24 weeks, the two energy levels tested (11·72 and 12·56 MJ/kg) did not significantly affect weight gain and feed efficiency whereas feed consumption was significantly higher on the lower energy level.The present studies suggest that 20, 18 and 16% protein, all with metabolizable energy of 11·72 MJ/kg, may be recommended for turkeys aged 12–16 weeks, 16–20 weeks and 20–24 weeks respectively.

Virtual monochromatic image at lower energy level for assessing pancreatic ductal adenocarcinoma in fast kV-switching dual-energy CT

2020 ◽  
Vol 75 (4) ◽  
pp. 320.e17-320.e23
Author(s):  
Y. Noda ◽  
S. Goshima ◽  
T. Kaga ◽  
T. Ando ◽  
T. Miyoshi ◽  
...  
Keyword(s):  
Energy Level ◽  
Pancreatic Ductal Adenocarcinoma ◽  
Lower Energy ◽  
Dual Energy ◽  
Ductal Adenocarcinoma ◽  
Dual Energy Ct ◽  
Monochromatic Image ◽  
Lower Energy Level ◽  
Virtual Monochromatic Image

scholarly journals Series of emission and absorption bands in the mercury spectrum

1927 ◽  
Vol 116 (775) ◽  
pp. 702-719 ◽  
Keyword(s):  
Energy Level ◽  
Quantum Number ◽  
Normal State ◽  
Resonance Line ◽  
Lower Energy ◽  
Band Spectrum ◽  
Absorption Bands ◽  
Lower Energy Level ◽  
Starting Point ◽  
Apparent Violation

In a recent paper some remarkable phenomena exhibited by the mercury band spectrum in emission were described. In particular it was shown that the band spectrum was intimately related to the resonance line 1 1 S 0 — 1 3 P 1 (2537) and the “forbidden” lines 1 1 S 0 — 1 3 P 0 (2656) and 1 1 S 0 — 1 3 P 2 (2270) which appear strongly with it, in spite of the apparent violation of the inner quantum number rule which this implies. A system of emission bands was described, extending from λ 3055 to λ 2697, with the spacing diminishing from 21 A to about 6 A. The starting point of the present investigation was to look for these bands in absorption, so as to determine whether they had for their lower energy level one associated with the normal state of the molecule.

A bidirectional reflectance distribution function model of space targets in visible spectrum based on GA-BP network

2020 ◽  
Vol 126 (6) ◽  
Author(s):  
Yuying Liu ◽  
Jingjing Dai ◽  
Sisi Zhao ◽  
Jinghao Zhang ◽  
Tong Li ◽  
...  
Keyword(s):  
Distribution Function ◽  
Visible Spectrum ◽  
Bidirectional Reflectance Distribution Function ◽  
Bidirectional Reflectance ◽  
Function Model ◽  
Bp Network ◽  
Bidirectional Reflectance Distribution

A Statistical Adaptable Distribution Function Model for Low Probabilities of Failure

1993 ◽  
Author(s):  
Suryaji R. Bhonsle ◽  
Paul Thompson
Keyword(s):  
Experimental Data ◽  
Distribution Function ◽  
Experimental Results ◽  
Function Model ◽  
Log Normal ◽  
Function Models

Abstract Weibull, log normal, and some other Distribution function models (D.F.M.) have a tendency to deviate from experimental results. This deviation, either exceedingly conservative or nonconservative, is amplified at low probabilities of failure. To remedy such problems a new D.F.M. is derived. It is then used to predict low probabilities of failure. The predictions are consistent with experimental data and are not too conservative or too nonconservative.

Equivalent relation for wave theory of the Gunn diode using the negative mobility and the distribution function model

1966 ◽  
Vol 54 (8) ◽  
pp. 1076-1077
Author(s):  
Y. Suematsu ◽  
Y. Nishimura
Keyword(s):  
Distribution Function ◽  
Wave Theory ◽  
Gunn Diode ◽  
Function Model ◽  
Equivalent Relation

scholarly journals The effect on rats of practical diets containing different protein and energy levels

1983 ◽  
Vol 17 (4) ◽  
pp. 330-335 ◽  
Author(s):  
D. J. Ford ◽  
R. J. Ward
Keyword(s):  
Energy Level ◽  
Lower Energy ◽  
Energy Levels ◽  
Amino Acid Content ◽  
Bodyweight Gain ◽  
The Other ◽  
Food Utilization ◽  
Fat Deposits ◽  
Consequent Increase ◽  
Different Levels

Rats of 3 strains were fed diets of natural ingredients in 4 different laboratories. The diets contained different levels of protein and energy within ranges comparable to those found in existing laboratory diets. Energy level over the range examined appeared to exert greatest influence on bodyweight gain, but had no effect on food intake. The diet with the highest amino acid content was consumed in smaller amounts than the other diets. Food utilization was less efficient in the lower energy diets. Fat deposition was reduced in animals fed the lowest energy diet. It is concluded that energy level of the diet exerts an effect on the rate of bodyweight gain in rats, but that for longer-term studies a reduced energy level may be beneficial by leading to smaller fat deposits with consequent increase in longevity.

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