摘要:

An automatic adiabatic differential calorimeter has been constructed to record the release spectrum of stored energy of deformation of metals from −196 to 500°C. A cold worked and an annealed specimen contain internal heaters which are powered by amplifiers, the signal inputs to which are specimen‐to‐calorimeter wall differential thermocouples. Control circuits attempt to maintain conditions as adiabatic as possible, and the power difference to the specimen heaters necessary to do this is taken as the stored energy of deformation.

ISSN:0034-6748    

DOI:10.1063/1.1685126

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

The theory, design, and operation of a bleed‐type pressure transducer for measurement of static pressure fluctuations in turbulent incompressible air flow are described. The transducer features miniature size (0.89 mm diam orifice), good sensitivity (3.0 mV/cm of water), minimal yaw sensitivity, and approximately uniform amplitude response from dc to 8 kHz using helium as the bleed fluid. Static and dynamic methods of calibration are described as well as an experimental arrangement for wind tunnel measurements.

ISSN:0034-6748    

DOI:10.1063/1.1685127

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

A high temperature rotary Knudsen cell assembly is described which, operating in conjunction with a mass spectrometer, may be used to determine the spatial distributions of individual species effusing from ideal and nonideal orifices and of species vaporizing from surfaces. This unit rotates about an axis contained within the plane of the face of the orifice or surface and is capable of reproducible angular settings of 0.2° under high temperature, high vacuum conditions. The apparatus is particularly suited to those types of mass spectrometers which are too cumbersome to be used as movable detectors. The angular distribution curves which result from these measurements may be used to determine orifice transmission probabilities and, in certain cases, to determine mass spectrometric parent‐fragment relationships which other techniques have failed to resolve.

ISSN:0034-6748    

DOI:10.1063/1.1685128

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

The theorical output signal of an eddy current sensor has been derived by two techniques. The physical analysis, which requires simplifying assumptions, leads to an expression suitable for numerical evaluation, while the dimensional analysis approach results in a similar formula that can serve as a guide to experiments.

ISSN:0034-6748    

DOI:10.1063/1.1685129

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

We describe the use of field effect transistors of both the metal‐oxide‐semiconductor and the n‐channel junction type in marginal oscillator circuits designed respectively for the observation of NMR in the range 2–60 MHz and NQR in the range 3–40 MHz.

ISSN:0034-6748    

DOI:10.1063/1.1685130

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

The preparation of thin and uniform plastic films for rocket‐borne x‐ray proportional counters is described. The technique has produced entrance windows of 60 &mgr;g/cm2thickness and 700 cm2in area.

ISSN:0034-6748    

DOI:10.1063/1.1685131

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

A very simple and compact 12 GHz marginal oscillator employs a commercial Gunn device as both microwave source and detector. The sensitivity to electron spin resonance absorption (3×1012standard spins) is comparable to that of a conventional homodyne bridge spectrometer. As a heterodyne detector of externally generated microwaves the sensitivity is ∼10−12W.

ISSN:0034-6748    

DOI:10.1063/1.1685132

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

An oxidation apparatus is described which continuously records the volume of oxygen absorbed by a sample of oil, in a closed system, maintained at constant temperature and pressure. The apparatus is automated through the use of a specially devised liquid level probe and other ancillary equipment such as recorders, timers, and temperature controllers. The apparatus can be used to compare the relative oxidation stability of various lubricants over a wide range of operating conditions.

ISSN:0034-6748    

DOI:10.1063/1.1685133

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

A mass spectrometer is described which measures the neutral and the ionized components of the upper atmosphere simultaneously (delay ∼20 msec). Its 1% mass resolution is 60 and its sensitivity is sufficient to measure small ion concentrations in the presence of high neutral gas densities. During rocket flights the shift in the mass scale between the ion peak and the corresponding neutral peak is a measure for the rocket skin potential.

ISSN:0034-6748    

DOI:10.1063/1.1685134

出版商:AIP    

年代:1971

数据来源: AIP

摘要:

A description is given of a molecular beam apparatus which extends high resolution absorption spectroscopy into the shorter millimeter wavelength region (up to 500 GHz). A parallel‐plate‐type absorption cell, allowing for Stark modulation, is used with the molecular beam passing between the plates. The half‐width of the absorption lines is about 5 kHz at a resonance frequency of about 200 GHz.

ISSN:0034-6748    

DOI:10.1063/1.1685135

出版商:AIP    

年代:1971

数据来源: AIP