摘要:

The 600 kv. ion acceleration equipment that has been developed at the Ottawa Laboratory of the National Research Council is described. Details of ion source power column, and control gear are given. Using hydrogen a total ion beam of 250 to 300 μa. was obtained, of which about 80% was atomic ions.

ISSN:1923-4287    

DOI:10.1139/cjr48f-041

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

Results are given for the oxidation in reaction chamber No. 10 of pentane mixed with air, mixture strength being varied from 25% weak to 100% rich. Oxidations were carried out with and without additions of iron carbonyl to the pentane. The experiments were made mainly to find a rational explanation for the antiknock property of rich fuel–air mixtures. The experimental results for undoped mixtures show that, at temperatures approaching those of the end gas in an engine reaction velocity increases by 100% on increasing mixture strength over the range mentioned above and by 100% on increasing temperature from 600° to 650 °C. Similar increases in reaction velocity with rise of temperature and with increase of mixture strength were obtained for the doped mixtures over the high temperature range but at temperatures 150 °C. lower than for undoped mixtures. The characteristics of the experimental results confirm the conclusion reached in earlier Parts, namely, that oxidation of pentane m the conditions of the experiments is a heterogeneous reaction.

ISSN:1923-4287    

DOI:10.1139/cjr48f-042

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

A photometer for use in the near ultraviolet has been designed and built with particular attention to simplicity, ruggedness, and reliability.

ISSN:1923-4287    

DOI:10.1139/cjr48f-043

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

A study of the fluctuations of cardiac period from beat to beat gives information as to the activity of the vagus and sympathetic nerves which control heart rate. The instrument uses the electrocardiac voltages (Q.R.S. complex) between right arm and left leg, with the left arm grounded to the instrument. The out-of-phase voltages are amplified first by a differential amplifier, of high discrimination, then by a two stage pulse amplifier. The output is further amplified and distorted by a 'pulse-shaping' circuit to give a positive-going triggering impulse. This impulse, by 'striking' the thyratron of a 'sweep generator', causes the discharge of a condenser which has been slowly charging at a nearly constant rate. A recording milliammeter, of the ink-writing type, is connected to the condenser through a 'sweep amplifier' so that it draws a series of transverse lines on the record, the length of each being determined by the duration of the cardiac period before the next triggering impulse arrives. Over a long period of time, every successive cardiac period is recorded in a comparatively short record. Results have already shown the astonishing variability of the normal cardiac rhythm.

ISSN:1923-4287    

DOI:10.1139/cjr48f-044

出版商:NRC Research Press    

年代:1948

数据来源: NRC

摘要:

An omnidirectional, vertically polarized antenna was required for use in the ground installations of the Airborne Distance Indicator program of the National Research Council. This antenna was to be mounted on the center tower of the Radio Range Beacons of the Department of Transport, and it was hoped that a certain amount of gain over a quarter-wave rod antenna could be realized. This paper describes an array of four elements stacked vertically, each element being a half-wave radiator in the form of a cylinder surrounding a mounting pipe. A gain of about four decibels over a half-wave dipole is obtained in a rugged and relatively simple form. Operation is possible over a 10% frequency band, centered on 223 Mc. per sec. It is suggested that similar antennas may find a wide field of application in the VHF band.

ISSN:1923-4287    

DOI:10.1139/cjr48f-045

出版商:NRC Research Press    

年代:1948

数据来源: NRC