摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr31-031

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

The work reported in this paper is a continuation of the experiments carried out in 1927, 1928 and 1929 at the Atlantic Biological Station. The animals experimented upon were placed in three quartz tubes which were placed in a three-compartment box, each compartment receiving only the light which passed through the filter in the front of the compartment. The animals in the first compartment received only visible radiation, those in the second compartment received both visible and ultra-violet radiation, and those in the third compartment received only ultra-violet radiation and a little of the extreme violet. Young starfishes,Asterias vulgaris, were found not to be affected by ultra-violet radiation. The nudibranch,Eolis gymnota, which occurs at depths from seven to ten metres, proved sensitive to ultra-violet. The little thin-shelled mollusc,Yoldia sapotilla, was found to be affected injuriously by ultra-violet, while the amphipodHyperia galbawhich has the peculiar habit of living in the cavity of the jellyfish,Aurelia aurita flavidula, proved to be resistant to ultra-violet radiation.

ISSN:1923-4287    

DOI:10.1139/cjr31-032

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

Eugenol, isoeugenol, safrole and isosafrole when treated with stannic chloride yield polymers with molecular weights of the order of 2000, and when heated at 197° or 236 °C. polymers with molecular weights of the order of 1000. The ease of polymerization of the iso-compounds, which contain a semi-benzenoid conjugated system, is markedly greater than that of the normal compounds, in which such a system is lacking. The polymers are all unsaturated. Polysafrole yields safrole when subjected to pyrolytic distillation.

ISSN:1923-4287    

DOI:10.1139/cjr31-033

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

The density of sulphur dioxide has been measured by the same method as that previously described in this Journal and equations of five isothermals are given. Some evidence of adsorption influence appears in the isothermal at − 7.82 °C. The normal density of sulphur dioxide found is 2.9262.

ISSN:1923-4287    

DOI:10.1139/cjr31-034

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

The presence of organic vapors in a hydrogen discharge is shown to influence greatly the current collected by an exploring electrode immersed in the discharge. It appears that the vapor molecules striking the collector may remain attached to its surface thus forming an insulating layer around it and limiting the current collected. The rate of formation of this layer is obtained from the rate of decrease of current to the collector. It is shown that this rate varies very greatly with the voltage of the collector and that the time required for the current to be reduced to one-half its initial value is shortest when the collector is at the space potential.

ISSN:1923-4287    

DOI:10.1139/cjr31-035

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

In experimenting with oscillators operating at wave-lengths of 100 cm. and less an unusual case of oscillations was observed. With high positive grid potential and zero plate potential in a three-electrode valve, oscillations were produced at certain critical values of filament current. The frequency of oscillation was highest at the lowest filament current. An explanation of the effect is suggested.

ISSN:1923-4287    

DOI:10.1139/cjr31-036

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

A second series of experiments on the batch hydrogenation of McMurray bitumen has been carried out. A cylindrical autoclave, of 1.8 litres capacity and designed for close temperature control and efficient agitation, is described.Hydrogenation of the larger part of the bitumen proceeded with ease and commenced at comparatively low temperatures. The rate of hydrogenation was dependent on temperature, presence of a catalyst and extent of hydrogenation. The reaction commenced slowly at 200 °C. and increased with rising temperature. The presence of molybdic anhydride approximately doubled the rate of reaction. The extent and rate of hydrogenation decreased on repeated runs with the same lot of bitumen due to the adverse effect of an increasing proportion of simple hydrocarbons.An increase in the relative amount of hydrogen to bitumen increased the absolute rate of reaction and degree of hydrogenation possible in one treatment. As a result of the shorter time required, coke formation was largely suppressed.Experiments on distillation residues from hydrogenated bitumen reveal the presence in bitumen of some 15% of asphaltic material which is very resistant to hydrogenation or cracking at temperatures as high as 500 °C. This material has not yet been hydrogenated without considerable coke formation but the problem does not appear to be insoluble.It appears that 75% of Alberta bitumen may be converted easily to gasoline and oil.

ISSN:1923-4287    

DOI:10.1139/cjr31-037

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr31-038

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr31-039

出版商:NRC Research Press    

年代:1931

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr31-040

出版商:NRC Research Press    

年代:1931

数据来源: NRC