Influence of reflected radiation on a pulsed xenon discharge in quartz tubes (review)

1981 ◽  
Vol 35 (3) ◽  
pp. 943-953 ◽  
Author(s):  
Yu. G. Basov
Keyword(s):  
Quartz Tubes

APPLICATION OF ESR TO HIGH-Tc SUPERCONDUCTORS AND RELATED MATERIALS IV: ALKALI K DOPING EFFECTS ON THE SUPERCONDUCTING CHARACTERISTICS OF K3C60

1999 ◽  
Vol 13 (02) ◽  
pp. 59-69
Author(s):  
K. SUGAWARA ◽  
N. OHYA ◽  
N. ARAI ◽  
S. ICHIMURA ◽  
K. YAMAMOTO ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Calcination Temperature ◽  
Volume Fraction ◽  
Superconducting Properties ◽  
High Tc Superconductors ◽  
High Tc ◽  
Doping Effects ◽  
Superconducting Volume Fraction ◽  
Vortex Size ◽  
Quartz Tubes

Several samples of K 3 C 60 have been made by the calcination of C 60 powder plus K flakes in evacuated quartz tubes at temperatures between 100°C and 700°C for 24 hours. The non-resonant microwave absorption (NRMA) measurements have been done below T c for these samples. From the linewidths and intensities of the NRMA signals, the superconducting properties (T c superconducting volume fraction and vortex size) have been studied as a function of the calcination temperature.

PYROLYSIS OF THE LOWER PARAFFINS: II. THE PRODUCTION OF OLEFINES IN BAFFLED QUARTZ TUBES

1933 ◽  
Vol 9 (2) ◽  
pp. 175-196 ◽  
Author(s):  
Adrien Cambron ◽  
Colin H. Bayley
Keyword(s):  
High Temperature ◽  
Turbulent Flow ◽  
Gas Flow ◽  
Side Reactions ◽  
Open Tube ◽  
High Degree ◽  
Quartz Tubes

The pyrolysis of the lower paraffins in externally heated quartz tubes has been studied under conditions of streamline and turbulent flow. It has been found possible to produce a high degree of turbulence in the flow of paraffin gases through tubes heated to a high temperature. It has been shown that when the pyrolysis is carried out under conditions of turbulent flow the yields of olefines obtained at a given temperature are greatly increased over those obtained in an open tube. It is further shown that under conditions of turbulent flow higher rates of conversion of the lower paraffins to olefines are possible since the temperatures at which side reactions begin to be noticeable are considerably higher under the above conditions than when the gas flow is streamline.

Rational use of graphite in the production of quartz tubes

1973 ◽  
Vol 30 (12) ◽  
pp. 864-865
Author(s):  
R. S. Zolotareva ◽  
V. N. Ruslov ◽  
V. A. Kostyrya ◽  
A. M. Moskalenko
Keyword(s):  
Rational Use ◽  
Quartz Tubes

Rubber. XVth Communication. The Polymerization of Rubber, Isoprene, and Styrene by Light in the Presence of Sensitizing Agents

1934 ◽  
Vol 7 (1) ◽  
pp. 184-196
Author(s):  
Rudolf Pummerer ◽  
Hans Kehlen
Keyword(s):  
Ultra Violet ◽  
Molecular Size ◽  
Ultra Violet Light ◽  
Violet Light ◽  
Quartz Tubes

Abstract Although according to Bernstein, exposure of rubber solutions to light in the absence of air diminishes the viscosity of the solutions, it is the conviction of the present authors that this change takes place only when there is air over the solutions. In 1920 Porritt observed that a rubber solution sealed off from contact with air gelatinized on exposure to light. Kirchhof however found this to be true only with small quantities of rubber solutions in quartz tubes exposed to ultra-violet light. This reaction was of particular interest to the present authors because of its possible relation to the vulcanization reaction, which can be regarded as an increase in molecular size, and as the formation of chains of rubber molecules with and without sulfur. Irradiation is perhaps an effect similar to vulcanization, but is brought about by polymerizations. It was also of interest to compare irradiated and gelatinized sol rubber with gel rubber. All the experiments described in the present paper were carried out with water-clear sol rubber, which was prepared in most cases from crepe.

scholarly journals Degradation of UV-filter Benzophenon-3 in aqueous solution using TiO2 coated on quartz tubes

2018 ◽  
Vol 16 (2) ◽  
pp. 213-228 ◽  
Author(s):  
Nazanin Moradi ◽  
Mohammad Mehdi Amin ◽  
Ali Fatehizadeh ◽  
Zahra Ghasemi
Keyword(s):  
Aqueous Solution ◽  
Uv Filter ◽  
Quartz Tubes

The Oxidation of Rubber at Atmospheric Temperatures

1931 ◽  
Vol 4 (2) ◽  
pp. 229-238
Author(s):  
W. C. Davey
Keyword(s):  
Acetone Extract ◽  
Similar Form ◽  
Degree Of Cure ◽  
Moist Atmosphere ◽  
Oxidation Rates ◽  
Insoluble Form ◽  
The Difference ◽  
Acetone Extracts ◽  
Very High ◽  
Quartz Tubes

Abstract (1) Oxidation at ordinary temperatures in the dark proceeds very slowly for unextracted rubbers, but at quite a reasonable speed for extracted rubber-sulfur mixings. The rate of oxidation of accelerated mixings, even if acetone-extracted, is very slow. (2) The final increases in weight after long aging are higher at ordinary temperatures than at 70° C. and the amount of acetone extract and the (acetone extract)/(increase in weight) ratios are also very much higher. (3) Storage in a moist atmosphere retards the oxidation in comparison with storage in a dry atmosphere, but the relative rates of oxidation in the two media are dependent on the rubbers under consideration. With slowly oxidizing samples, the lower the degree of cure the less the difference in oxidation rates, but with fast oxidizing rubbers the difference in rates of oxidation in the two media is less if the degree of cure is higher. The amount of acetone extract formed is less during storage in a moist atmosphere than in a dry one. (4) The acetone extract curves show definite maxima due to the change of the extract to insoluble matter, but the tendency for this change is small at atmospheric temperatures. (5) The effect of exposure in sunlight is to cause markedly lower acetone extracts to be obtained than when the samples are stored indoors. Exposed in quartz tubes, the extent of the acetone extract change to insoluble matter is of the order of that at 70° in the dark, and the acetone extract curves are of a similar form. Exposed in glass vessels the degree of extract conversion is not so great as at 70° but very much greater than when the samples are stored indoors. Accelerated mixings exposed in sunlight give very high acetone extracts, indicating that the acetone extracts of such mixings have little tendency to pass into an insoluble form.

The use of a thermobaric analyzer at synthesis of the HgCaO2 and superconductor Hg-1223 inside sealed quartz tubes

2000 ◽  
Vol 341-348 ◽  
pp. 2469-2470 ◽  
Author(s):  
A.G. Cunha ◽  
M.T.D. Orlando ◽  
F.G. Emmerich ◽  
E. Baggio-Saitovitch
Keyword(s):  
Quartz Tubes
Sign in / Sign up

Export Citation Format

Share Document