摘要:

A portable instrument for making gamma-ray surveys of diamond drill holes to depths of 1000 ft. is described. The circuit is given in detail.

ISSN:1923-4287    

DOI:10.1139/cjr49f-002

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

Processed rape and mustard seed oils were hydrogenated at 50 lb. pressure and 284° F., using a commercial nickel formate catalyst, and were deodorized for one hour at 464° F. The stability of the hardened oils compared favorably with that of a standard commercial vegetable shortening. Taste panel tests indicated that both the rape and mustard shortenings were as satisfactory as the commercial reference material for the preparation of pastry and doughnuts. Special study of the rape product showed that it could be plasticized, and it gave good results in baking volume experiments.

ISSN:1923-4287    

DOI:10.1139/cjr49f-003

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The copolymerization of styrene and butadiene in ratios in which the styrene equals or predominates over the butadiene on a mass basis is essentially similar to copolymerization in the presence of a predominance of butadiene. However, the rate of reaction and the length of the induction period is increased. Increasing the amount of the dodecyl mercaptan regulator results in a slight increase in rate and diminution of the induction period. The dodecyl mercaptan reacts at a lower rate than during the production of GR–S. The regulating index as defined by the ratio of the logarithm of the residual mercaptan over the conversion is 1.53. The bound styrene and increment styrene curves seem to be normal and indicate reactivity ratiosr1(butadiene) equal to 1.4 to 2.2,r2equal to 0.5 to 0.7. If these reactivity ratios are corrected for the bifunctional nature of butadiene then the constants for butadiene monomer areQequal to 0.9 andeequal to − 1. Likewise the gel–viscosity data are similar to those observed with GR–S except that the pre-gel rise in viscosity, the formation of gel, and the slope of the viscosity conversion curves diminish with increasing styrene in the charge. The chain transfer action of styrene is increasingly evident with increasing styrene content in the charge but in all cases the regulating effect of dodecyl mercaptan is still apparent.

ISSN:1923-4287    

DOI:10.1139/cjr49f-004

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

A dynamometer, designed to determine depth of freezing in frozen foods, such as meat, poultry, and eggs, measures the force required to drive a pointed rod through a sample of the product.

ISSN:1923-4287    

DOI:10.1139/cjr49f-005

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

Minor mechanical modifications to the clock motor of a quartz crystal primary standard of frequency simplify the problem of producing accurate low frequencies. Electromechanical gate circuits are used to provide pulses of high stability at repetition rates of 1, 10, 100, and 1000 pulses per second for stroboscopic and other applications.

ISSN:1923-4287    

DOI:10.1139/cjr49f-006

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The adsorption and desorption of water vapor by wheat was measured by means of a McBain sorption balance. Curves are obtained showing the rate at which moisture is adsorbed by kernels of wheat directly exposed to a humidified atmosphere, and a theory is advanced to account for the rate of adsorption. It is shown that the rate of adsorption is governed largely by the time taken for the moisture to diffuse up to the surface of the wheat. Under storage conditions, this is much greater than the time required for the moisture to penetrate the kernel of wheat from its surface.

ISSN:1923-4287    

DOI:10.1139/cjr49f-007

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

The relation between palatability and fluorescence value previously established for 33 samples of plain egg powder, was substantiated by comparisons for 118 samples. Fluorescence measurements were more readily reproduced among various laboratories than measurements of potassium chloride value. Batter density measurements were found to be a satisfactory measure of the baking quality of sugar–egg powder and were more convenient than the baking of test cakes. Particle size of spray-dried sugar–egg powder was also related to baking quality; powder falling between 50 and 200 mesh (U.S. Bureau of Standards) yielded the lightest sponge goods.

ISSN:1923-4287    

DOI:10.1139/cjr49f-008

出版商:NRC Research Press    

年代:1949

数据来源: NRC

摘要:

This paper describes a preliminary study of alloys of nickel and aluminum modified with molybdenum. The purpose of this work is to develop an alloy for use under conditions of stress at temperatures of 815 °C. (1500° F.) and over. The room temperature mechanical properties of alloys of nickel and aluminum, and the influence of molybdenum on these properties, have been investigated. Certain combinations of nickel, aluminum, and molybdenum have been shown to possess tensile strengths well over 100,000 lb. per sq. in. at room temperature, and it has been demonstrated that certain characteristic microstructures, dependent upon the ratio of nickel to aluminum, are essential for the realization of these high strengths. Creep-rupture tests at 815 °C. (1500° F.) have been carried out on typical nickel–aluminum–molybdenum alloys. The results have shown that certain of these alloys are superior in many respects to existing high temperature alloys, when tested under creep-rupture conditions at 815 °C. (1500° F.). The same characteristics of microstructure that are essential for high room temperature strengths were also found to be necessary to obtain good creep-rupture characteristics at 815 °C. (1500° F.).

ISSN:1923-4287    

DOI:10.1139/cjr49f-009

出版商:NRC Research Press    

年代:1949

数据来源: NRC