ISSN:0021-8979    

DOI:10.1063/1.1698284

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

This paper describes some of the phenomena found to have their origin in electrically induced fibration of small particles in fluid liquid suspension. Particular attention is given to induced shear resistances found in layers of the fluid (0.01 to 0.15 cm) when bounded by potentialized electrode surfaces. Ingredients and manner of compounding concentrated fluids capable of reversible shear resistance up to several hundred grams per cm2are described. Dynamic induced shear resistance or the corresponding induced bulk viscosity are shown to be a parabolic function of field strength wherein parameters dependent on surface conditions of the particles are involved. Various properties of these fluids are discussed with regard to the mechanism of induced fibration, its application in slip clutches and other hydraulic devices, and some of the factors for best results. Consideration is given to the analogous magnetically induced fibration of ferromagnetic particles in fluid suspension. It is found that the observed values of induced shear resistance approximate those predictable from the well‐known formulas for tractive force in both the electric and magnetic cases. Mention is also made of fluid suspensions of ferrite powders which respond to both electric and magnetic fields.

ISSN:0021-8979    

DOI:10.1063/1.1698285

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

An empirical method of calculating mass absorption coefficients is given. Complete tables of constants are presented for calculating &mgr;/&rgr; for all elements and for wave‐lengths less than theKcritical absorption wave‐length. Partial tables give constants for wave‐lengths between theL1andM1critical wave‐lengths.Calculated mass absorption coefficients are given for the common elements.

ISSN:0021-8979    

DOI:10.1063/1.1698286

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

From information about space‐charge‐limited currents, the transit time of electrons between a cylindrical cathode and an external coaxial anode has been computed. Taylor's series expansions of the functions useful in the calculations are given. These together with the tabulated values permit rapid calculation of electron transit times with an accuracy of 0.1 percent.

ISSN:0021-8979    

DOI:10.1063/1.1698287

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

The bending problem is solved mathematically for a thin circular plate subjected to a uniform load. The material of the plate is assumed to have three symmetrical planes with respect to its elastic properties.The solution is carried out in the case when the edge is simply supported, and it involves some numerical calculations. An empirical formula for the deflection is also given in a simpler form.

ISSN:0021-8979    

DOI:10.1063/1.1698288

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

The torsion problem is theoretically treated for a prismatic cylinder with a star‐shaped section. To simplify the calculation, the bounding curve is assumed to be composed of logarithmic spirals. In one example the stress distributions on the boundary and on the symmetrical radial lines, and the torque are calculated. The result is confirmed by an experiment.

ISSN:0021-8979    

DOI:10.1063/1.1698289

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

A special powder is used to show how static electricity is distributed on materials such as paper. Red particles of this powder are attracted to positively charged areas and blue particles are attracted to negatively charged areas. Paper from heat‐set printing presses shows streaks of static electricity generated by idling rollers and shifting patterns of static electricity generated in the folder, often with opposite charges on the same sheet of paper.

ISSN:0021-8979    

DOI:10.1063/1.1698290

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

It has been shown experimentally that the mechanism of sintering of spherical glass particles is that of viscous flow. The viscosities of the investigated glass were determined for a range of temperatures from 575°C to 744°C. These viscosities remain in good agreement with those obtained by other methods.

ISSN:0021-8979    

DOI:10.1063/1.1698291

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

An experiment was performed in order to determine the magnitude of that portion of dry, kinetic friction which is contributed by Coulomb friction, or the mechanical interlocking of surface irregularities. The results indicate that the work of the mechanical component of friction accounts for only a few percent of the work of total measured friction.

ISSN:0021-8979    

DOI:10.1063/1.1698292

出版商:AIP    

年代:1949

数据来源: AIP

摘要:

Gold deposited in vacuum at liquid air temperature contained defects and strain. The number of defects and their characteristic decay energy increased rapidly with increasing rate of deposit in the range from 1 to 5 micrograms/cm2/min. The defects decayed with rising temperature but the relief of strain did not occur until after most of the defects had disappeared. Electron micrographs showed that the gold film was made up of aggregations of discreet particles rather than a smooth continuous film.

ISSN:0021-8979    

DOI:10.1063/1.1698302

出版商:AIP    

年代:1949

数据来源: AIP