摘要:

The data of a previous publication have been extended. Nine pressure isothermals of the one component system ethylene in the critical region are given. Further evidence of the existence of a two phase system above the temperature of meniscus disappearance as normally determined is presented. The existence of a latent heat of vaporization above this temperature is pointed out. An explanation of the hysteresis of liquid phase density with temperature at constant volume is offered, and a qualitative description of the changes occurring in the transition region of liquid to gas is developed from the experimental evidence.

ISSN:1923-4287    

DOI:10.1139/cjr39b-034

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

L. Roux found that α-bromonaphthalene was partly converted into β-bromonaphthalene by warming with aluminium chloride and carbon disulphide. Because of the interest in the β-derivatives for the preparation of naphthalene-2-acetic acid, one of the synthetic plant hormones, this investigation was undertaken to improve, if possible, upon the yield hitherto obtained. Several metals, notably antimony, molybdenum, nickel, and tungsten, in conjunction with aluminium chloride, gave increased yields.

ISSN:1923-4287    

DOI:10.1139/cjr39b-035

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

Average samples of 12 grades of Western Canadian wheat (1935 crop) were analyzed for starch by a polarimetric method. The samples of the ordinary milling grades, in which Marquis was the predominant variety, contained from 50 to 52% of starch on a basis of 13.5% moisture. Samples of Garnet wheat contained about 55% starch. Rusted wheat had a lower starch content. There is positive correlation between starch content and specific gravity of the kernels.Comparison with data obtained elsewhere on the same samples shows that the sum of the starch and protein is closely related to the flour yield.

ISSN:1923-4287    

DOI:10.1139/cjr39b-036

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

2:2′-Biquinolyl, prepared by catalytic dehydrogenation of quinoline, has been found to give a purple colour with the cuprous ion under certain conditions. The colour reaction is sensitive, specific for copper, and the intensity of the colour produced follows Beer's law. A procedure has been worked out for the detection and estimation of copper, the smallest amount of copper detectable being 1 part in 100,000,000. Stable complexes with cupric copper and cobalt have also been prepared.

ISSN:1923-4287    

DOI:10.1139/cjr39b-037

出版商:NRC Research Press    

年代:1939

数据来源: NRC

摘要:

The effect of alcohols on the setting time of silica gels has been studied through a pH range.The total effect and the divergence of the individual behaviour of both monohydric and polyhydric alcohols become greater as the alkalinity of the gel is increased. When the time of set with addition agent is plotted as percentage of the original time of set, there is a constant effect for an equal number of alcohol molecules at pH 7. This apparently eliminates the dielectric constant of the alcohol as a decisive factor in coagulation. When the system is acidic, all the alcohols behave as retarders; when it is alkaline, only the higher polyhydrics act in this manner. The monohydrics and glycol change from accelerators to retarders at pH values between 7.4 to 8.5. The pH at reversal for each addition agent does not coincide with the pH at which the original gel shows minimum setting time.

ISSN:1923-4287    

DOI:10.1139/cjr39b-038

出版商:NRC Research Press    

年代:1939

数据来源: NRC