摘要:

Tetrahydrofurfuryl alcohol remains mobile at −75 °C. in the presence of 0 to 20% water. It has a lower heat capacity, surface tension, and flash point than ethylene glycol, and undergoes almost identical expansion on heating. Its aqueous solutions exhibit maxima in specific gravity and viscosity at solute concentrations of 80 to 90% but do not distil azeotropically. Swelling and softening of immersed natural and synthetic rubber compounds were more serious with tetrahydrofurfuryl alcohol than with ethylene glycol, but only small differences were shown by radiator hose connections after lengthy immersion and driving tests. The viscosity of anhydrous glycol blends having freezing points of −50 °C. varies greatly with the glycol employed as second component, ethylene glycol – trimethylene glycol being the least viscous of the six binary glycol solutions studied. Substitution of tetrahydrofurfuryl acohol for the second glycol component reduces the viscosity but necessitates use of higher concentrations for equivalent freezing point lowering.

ISSN:1923-4287    

DOI:10.1139/cjr48f-022

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Analysis of 16 test samples in three collaborating laboratories indicated the desirability of initial standardization and periodic checking of reagents and of both sampling and analytical technique to ensure consistency of routine results. Average glucose content of a carlot of 1250 38-lb. containers might be determined with a standard error of the order of ± 10 mgm. per 100 gm. egg by a single analysis of each of two independent composite samples each obtained by combining and thoroughly mixing single 'cores' taken from 15 randomly chosen containers. This would also enable a running check to be kept on both the average and variance of the reported glucose contents by, e.g., 'control chart' methods. Precision of test results would be improved most effectively by increasing the number of individual containers sampled rather than the number of chemical analyses.

ISSN:1923-4287    

DOI:10.1139/cjr48f-023

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

A nuclear theory of self-ignition is described which is based on the substitution of finely divided carbon for the nuclear drops of the Callendar theory. The finely divided carbon appears in the gaseous combustible mixture in the engine as a result of pyrolysis of the lubricating oil or of the fuel. The theory is therefore of general application and can be applied to explain combustion knock or detonation when permanent gases such as hydrogen as well as hydrocarbon vapors are used as fuel for the carburetor type of internal combustion engine. The theory is supported by experimental evidence quoted mainly from earlier publications and is intended as a working hypothesis for further confirmatory experiments.

ISSN:1923-4287    

DOI:10.1139/cjr48f-024

出版商:NRC Research Press    

年代:1948

数据来源: NRC