摘要:

An investigation has been made of certain phenomena associated with space charge external to the grid which surrounds the cathode in a multi‐grid tube. This paper reports a new effect, the essential feature of which is a negative plate current‐emission characteristic. The conditions under which this phenomenon is observed are outlined. Results of experiments with double and triple grid tubes are summarized. In general, two points on the characteristic may be found for which the plate current is independent of small variations in emission, whether of a statistical or ``functional'' nature. An explanation is presented based on the interaction of multiple space charge. An application to the problem of high gain amplification is suggested.

ISSN:0021-8979    

DOI:10.1063/1.1745297

出版商:AIP    

年代:1935

数据来源: AIP

摘要:

A lower limit for the resistivity of commercial ceresin is set at 1.76×1019ohm‐cm if the voltage gradient is 2000 volts per cm the thickness of the sample is 0.214 cm and the temperature is 23°C. There is a comparatively large scattering of time functions used in the equation for the discharge current if expressed in accordance with Wagner's theory. The chargeQ``stored'' in ceresin is a function of time. At any time after the application of the voltage, this charge is proportional to the voltage.P/Ewas measured as a function oft.The increase is found to be more rapid than is claimed by other investigators. No variation ofP/EwithEwas found. The results, however, are not quite conclusive, because of the inherent weakness of the method used in determining the polarization. The resistanceRas defined by Richardson is calculated and found not to be constant for ceresin but to vary both with time and voltage.

ISSN:0021-8979    

DOI:10.1063/1.1745298

出版商:AIP    

年代:1935

数据来源: AIP

ISSN:0021-8979    

DOI:10.1063/1.1745299

出版商:AIP    

年代:1935

数据来源: AIP

摘要:

Results of preliminary tests by direct methods show definitely that alignment of particles in a magnetic field increases their magnetization up to saturation and augments their remanence, but that coercive force is not noticeably affected.

ISSN:0021-8979    

DOI:10.1063/1.1745300

出版商:AIP    

年代:1935

数据来源: AIP

摘要:

If a solid is constructed of the same material and to scale with a body of any shape and subjected to initial and surface temperature conditions of the same character, properties can be derived to compare or contrast the temperatures at corresponding points in these solids. Seven properties are given in this paper, covering the cases of variable and steady temperatures of solids with and without radiation or convection at any part of the boundary, and with any fixed temperature distribution on the rest of the surface. The law used for the transfer of heat by radiation and convection is a very general one. The thermal coefficients are functions of the temperature. These properties are derived by substitutions of new variables into the heat equation and the boundary conditions. Some of the properties give important information about the effect of the size of a solid upon its rate of cooling or heating. All of the properties are useful in the determination of temperatures in any solid by measuring the temperatures in a large or small scale model.

ISSN:0021-8979    

DOI:10.1063/1.1745293

出版商:AIP    

年代:1935

数据来源: AIP

摘要:

In hot rolled and in cold rolled sheets of silicon steel there are directions of easiest magnetization both before and after the final high temperature anneal. They are exhibited clearly by a disk suspended in a magnetic field. This property can be explained by the fact that a great part of the crystals composing the sample lie in a preferred orientation. The samples thus exhibit to a higher or smaller degree the anisotropic magnetic properties of single crystals. This non‐random orientation of the crystals was shown for the annealed samples by a determination of the orientation of a great number of crystals by a light reflection method. The preferred orientations in cold rolled and hot rolled annealed samples differ substantially.

ISSN:0021-8979    

DOI:10.1063/1.1745294

出版商:AIP    

年代:1935

数据来源: AIP

摘要:

In previous experiments it was found impossible to duplicate results of Hoyem and Tyndall who found a ``range'' for the successful growth of single crystals of zinc. Most specimens were ``optically mosaic.'' It is now shown that by adding Cd to Zn of highest purity, single crystals may be grown and that a ``range'' is connected with their growth. The range is similar to, but not identical with, that of Hoyem and Tyndall. Moreover, the shape of the range is dependent on the Cd content and on the speed of growth of the crystals. Optical mosaics as well as the changes of Hoyem and Tyndall are found outside of the range. In general optical mosaics are less frequent the higher the Cd content. Certain surface markings appear on the crystals even for only 0.20 percent Cd. These are believed to be identical with markings previously described by Rosbaud and Schmid and by Straumanis and probably indicate concentration of Cd along basal planes.

ISSN:0021-8979    

DOI:10.1063/1.1745295

出版商:AIP    

年代:1935

数据来源: AIP

摘要:

In previous papers we have investigated the conditions for spontaneous division of systems, which are seats of physico‐chemical reactionsof any kind.In this paper the previous general results are specialized for one particular set of reactions: oxidation of glucose and glycolysis. It is found, that whenever the two occur simultaneously, the ratio of their relative rates determines whether the system will divide spontaneously or not. Increased glycolysis favors spontaneous division. It is pointed out that the rapidly dividing cancer cells are characterized by an abnormally high rate of glycolysis.

ISSN:0021-8979    

DOI:10.1063/1.1745296

出版商:AIP    

年代:1935

数据来源: AIP