Measuring the content by volume of deuterium in heavy water with carbon dioxide dissolved in it

1985 ◽  
Vol 59 (3) ◽  
pp. 781-782
Author(s):  
T. I. Efimova ◽  
V. F. Kapitanov ◽  
G. V. Levchenko
Keyword(s):  
Carbon Dioxide ◽  
Heavy Water

Solubility of carbon dioxide in heavy water at pressures up to 40 atm

1970 ◽  
Vol 35 (12) ◽  
pp. 3761-3764
Author(s):  
J. Kratochvíl ◽  
J. Šobr ◽  
J. Matouš ◽  
J. Pick
Keyword(s):  
Carbon Dioxide ◽  
Heavy Water

Flame structure and flame reaction kinetics. VII. Reactions of traces of heavy water, deuterium and carbon dioxide added to rich hydrogen + nitrogen + oxygen flames

1972 ◽  
Vol 330 (1581) ◽  
pp. 219-245 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Heavy Water ◽  
Rate Constants ◽  
Flame Structure ◽  
Flame Temperature ◽  
Absolute Rate ◽  
Atom Concentration ◽  
Precise Form ◽  
Recombination Rate Constant ◽  
Overall Reactions

The overall reactions of traces of heavy water, deuterium and carbon dioxide added to some fuel-rich hydrogen + nitrogen + oxygen flames have been examined both experimentally and theoretically. The mechanism and most of the controlling rate constants for the flames both without and with the additives are now sufficiently firmly established for computation of the detailed flame profiles to be possible in all cases. By comparison of the computed profiles with experiment it is possible to deduce information about the reactions: OH + H 2 ⇌ H 2 O + H, (i) OH + HD ⇌ HOD + H, (iD a ) OH + CO ⇌ CO 2 + H. (xxi) At 1050 K the ratios k 1 / k 1D a = 2.8 and k 1 / k 21 = 11.3 were found, both with an accuracy of ± 15%. Assuming A 1 / A 1D a = 2.4 (the ratio of collision frequencies) led to a mean k 1 / k 1D a = 2.4 exp (+ 155/ T ); while combination of the observed ratio k 1 / k 21 with results of other investigators led to k 1 / k 21 = (120 ± 15)exp{ — (2400 ± 50)/ T }. It was also possible to relate the absolute rate constants for the above reactions fairly precisely with the hydrogen atom recombination rate constant k 15 , so that for a known value of the latter, the former could be derived with an accuracy of ± 10 to 15%. For k 15 = 4.5 x 10 15 for all molecules, the values found for the three rate constants were k 1 = (2.7 ± 0.4) x 10 12 , k 1D a = (9.6 ± 0.5 ) x 10 11 and k 21 = (2.4 ± 0.12) x 10 11 , all at 1050 K. Comparison of k 1 and k 21 with results of other investigators at comparable temperatures suggested that both may be slightly high. Lack of knowledge of the precise form of the relation between Ig k ; and 1/ T makes a closer evaluation difficult; but on the basis of a linear relation between 300 K and the flame temperature, a reduction of both k 1 and k 21 by about 10% would improve the agreement with much other work. By comparison with previous results showing the effect of variation of k 15 on the H atom concentration profile (Dixon-Lewis 1970), this would suggest an optimum value of k 15 of around 3.0 x 10 15 cm 6 mol -2 s -1 in the flame reaction zone. Combination of the observed values of k 1 and k 21 at 1050 K with those of other investigators led to the expressions lg k 1 = 13.57 ± 0.15 — (2770 ± 100)/2.303 T , lg k 21 = 11.49 ± 0.15 — (370 ± 100)/2.303 T .

A boron nitride CW Carbon dioxide waveguide laser for optically pumping heavy water

1980 ◽  
Vol 20 (1) ◽  
pp. 21-27 ◽  
Author(s):  
D.E. Evans ◽  
S.L. Prunty ◽  
M.C. Sexton
Keyword(s):  
Carbon Dioxide ◽  
Boron Nitride ◽  
Heavy Water ◽  
Waveguide Laser

Electron Cytochemical Study of Carbon Dioxide Laser Effect on Rhesus Monkey Cornea

1974 ◽  
Vol 32 ◽  
pp. 224-225
Author(s):  
K. C. Tsou ◽  
J. Morris ◽  
P. Shawaluk ◽  
B. Stuck ◽  
E. Beatrice
Keyword(s):  
Carbon Dioxide ◽  
Electron Microscope ◽  
Rhesus Monkey ◽  
Carbon Dioxide Laser ◽  
Cytochemical Study ◽  
Laser Effect

While much is known regarding the effect of lasers on the retina, little study has been done on the effect of lasers on cornea, because of the limitation of the size of the material. Using a combination of electron microscope and several newly developed cytochemical methods, the effect of laser can now be studied on eye for the purpose of correlating functional and morphological damage. The present paper illustrates such study with CO2 laser on Rhesus monkey.

The Critical Point Drying Method Applied to Scanning Electron Microscopy of L-929 Cells

1970 ◽  
Vol 28 ◽  
pp. 278-279
Author(s):  
Charles TurnbiLL ◽  
Delbert E. Philpott
Keyword(s):  
Electron Microscopy ◽  
Carbon Dioxide ◽  
Surface Tension ◽  
Critical Point ◽  
Freeze Drying ◽  
Attractive Alternative ◽  
Crystal Formation ◽  
Critical Point Drying ◽  
Time Required ◽  
Scanning Electron

The advent of the scanning electron microscope (SCEM) has renewed interest in preparing specimens by avoiding the forces of surface tension. The present method of freeze drying by Boyde and Barger (1969) and Small and Marszalek (1969) does prevent surface tension but ice crystal formation and time required for pumping out the specimen to dryness has discouraged us. We believe an attractive alternative to freeze drying is the critical point method originated by Anderson (1951; for electron microscopy. He avoided surface tension effects during drying by first exchanging the specimen water with alcohol, amy L acetate and then with carbon dioxide. He then selected a specific temperature (36.5°C) and pressure (72 Atm.) at which carbon dioxide would pass from the liquid to the gaseous phase without the effect of surface tension This combination of temperature and, pressure is known as the "critical point" of the Liquid.

A global perspective of ground level, 'ambient' carbon dioxide for assessing the response of plants to atmospheric CO2

2001 ◽  
Vol 7 (7) ◽  
pp. 789-796 ◽  
Author(s):  
L. H. Ziska ◽  
O. Ghannoum ◽  
J. T. Baker ◽  
J. Conroy ◽  
J. A. Bunce ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ground Level ◽  
Global Perspective ◽  
Atmospheric Co2

964: Direct Visualization of Renal Hemodyanamics Affected by Carbon Dioxide Pneumoperitoneum

2007 ◽  
Vol 177 (4S) ◽  
pp. 319-319
Author(s):  
Naoto Sassa ◽  
Ryohei Hattori ◽  
Yoshinari Ono ◽  
Tokunori Yamamoto ◽  
Momokazu Gotoh
Keyword(s):  
Carbon Dioxide ◽  
Direct Visualization ◽  
Carbon Dioxide Pneumoperitoneum
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