摘要:

An analog technique is described by which it is possible to obtain, without analytical computation, the Hall coefficient and magnetoresistance for any two‐dimensional sample with the magnetic field perpendicular to the plane of the sample, without regard for sample shape or electrode size and configuration.

ISSN:0021-8979    

DOI:10.1063/1.1723298

出版商:AIP    

年代:1958

数据来源: AIP

摘要:

TheQ(quality factor) of natural quartz was measured from 4.2°K to over 100°K. The quartz was in a high precisionATcrystal unit vibrating on overtones of the thickness shear at about 6.3 mc and 8.8 mc.At higher temperatures theQvaried rapidly with temperature, but did not depend on the particular mode of vibration.At low temperatures (say less than 10°K) theQalso depended on the mode of vibration. At these low temperatures theQbecame very large—a record of 55 million was observed on one mode at 4.2°K. Apparently another loss mechanism dominates at low temperatures, and very likely this mechanism may not be intrinsic to quartz. The mounting structure or gold electrodes may be the primary source of energy loss in the liquid helium temperature range.

ISSN:0021-8979    

DOI:10.1063/1.1723299

出版商:AIP    

年代:1958

数据来源: AIP

摘要:

Equations describing the flow of a Newtonian liquid on a rotating disk have been solved so that characteristic curves and surface contours at successive times for any assumed initial fluid distribution may be constructed. It is shown that centrifugation of a fluid layer that is initially uniform does not disturb the uniformity as the height of the layer is reduced. It is also shown that initially irregular fluid distributions tend toward uniformity under centrifugation, and means of computing times required to produce uniform layers of given thickness at given angular velocity and fluid viscosity are demonstrated. Contour surfaces for a number of exemplary initial distributions (Gaussian, slowly falling, Gaussian plus uniform, sinusoidal) have been constructed. Edge effects on rotating planes with rising rims, and fluid flow on rotating nonplanar surfaces, are considered.

ISSN:0021-8979    

DOI:10.1063/1.1723300

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1723301

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1723302

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1723303

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1723305

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1723306

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1723307

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1723310

出版商:AIP    

年代:1958

数据来源: AIP