摘要:

In scientific research, pulse amplitude or temporal distribution is often the analog of the phenomenon under investigation. Particularly is this true in nuclear studies, where pulse amplitude can be made proportional to energy and classification on an amplitude basis yields the energy spectrum. The present paper gives an outline of pulse amplitude analyzing equipment and indicates that for pulse widths of one microsecond and larger, as distinct from those in the millimicrosecond region, the thermionic diode leaves little to be desired as a voltage discriminating element.

ISSN:0034-6748    

DOI:10.1063/1.1746003

出版商:AIP    

年代:1951

数据来源: AIP

摘要:

The Lorentz factor for the Buerger precession method is derived. It turns out that the angular velocity of the motion of the reciprocal lattice through the sphere of reflection is not uniform as hitherto accepted. The Lorentz factor thus depends explicitly on all three cylindrical coordinates &xgr;, &zgr;, &tgr; of the reciprocal lattice point under consideration and not on only as &xgr; and &zgr;.

ISSN:0034-6748    

DOI:10.1063/1.1746004

出版商:AIP    

年代:1951

数据来源: AIP

摘要:

The reciprocal of the product of the Lorentz factor and the polarization factor is calculated for the zero level and&mgr;¯=30∘.

ISSN:0034-6748    

DOI:10.1063/1.1746005

出版商:AIP    

年代:1951

数据来源: AIP

摘要:

The effect of azimuthal variation in the height of the magnetic median plane on the vertical oscillations of a particle in a synchrotron having four straight sections is studied, particularly in the neighborhood of resonance between the frequency of these oscillations and the frequency of revolution. It is found that fourier analysis, which is needed in the case of a circular magnet, is replaced by analysis using modified sine and cosine functions. This investigation also applies to the effect on the radial betatron oscillations of azimuthal variation in the equilibrium radius.

ISSN:0034-6748    

DOI:10.1063/1.1746006

出版商:AIP    

年代:1951

数据来源: AIP

摘要:

A sensitive method of calorimetrically measuring the energy flux of an x‐ray beam is described. Thermistors are employed as the temperature‐sensitive elements and are embedded in the irradiated material in a calorimeter. Details and results of the application of this technique to a betatron x‐ray beam are described. This method can be applied to x‐ray beams of other energies and does not require high intensities.

ISSN:0034-6748    

DOI:10.1063/1.1746007

出版商:AIP    

年代:1951

数据来源: AIP

摘要:

A versatile counter that automatically sorts sample plates into several groups according to the radioactivity of the plates is described. Details are given for a counter specifically intended to minimize the tedious job of counting decontaminated plates for background.

ISSN:0034-6748    

DOI:10.1063/1.1746008

出版商:AIP    

年代:1951

数据来源: AIP

摘要:

The possibility of the efficient storage of large amounts of energy and its subsequent rapid conversion into useful electromagnetic energy has been studied. Efficient and economical storage of energy is possible in the form of kinetic energy of rotation. Conversion of energy stored in this manner into electromagnetic energy has been accomplished by using the rotating mass as the armature of a series wound homopolar generator. A successful prototype generator has been built and its performance compared with the theoretical operation of such a device. The prototype generator was capable of storing 29,000 joules when operating at 20,000 rpm. When it is operated under short circuit conditions, a current pulse of 56,000 amperes maximum is obtained in the single‐turn series field coil. Liquid mercury brushes were developed especially for this generator, since very low circuit resistance is required for self‐excited operation. The starting of the flow of mercury in the brush system serves to start the generator in operation. The possible further development and uses of this generator are discussed.

ISSN:0034-6748    

DOI:10.1063/1.1746009

出版商:AIP    

年代:1951

数据来源: AIP

摘要:

Thermal conductivity measurements made by the guarded‐hot‐plate method are subject to error from heat loss by convection at the exposed edges of the sample. Analytical solutions are found and plotted to show the maximum errors for square and round samples in apparatus of various dimensions.

ISSN:0034-6748    

DOI:10.1063/1.1746010

出版商:AIP    

年代:1951

数据来源: AIP

摘要:

The instrument described is of simple and rugged design. The anode is a wire loop, and the cathode includes a grounded line wire which electrically shields the sample. The line wire, when properly placed, provides greater stability and freedom from spurious effects due to the accumulation of a charge on the sample. The geometry is essentially 2&pgr;. The instrument may be used for the counting of alpha‐ as well as soft beta‐particles. It is self‐shielded.

ISSN:0034-6748    

DOI:10.1063/1.1746011

出版商:AIP    

年代:1951

数据来源: AIP

摘要:

As a means of studying the kinetics of rapid reactions in which a gas is evolved, a constant volume reactor has been designed. This reactor employs a static technique in which the reaction is followed by the increase in pressure as the gas is evolved. The apparatus is capable of contacting 1 ml of one reactant with 25 ml of a second reactant and obtaining effective mixing in less than 10 milliseconds.The pressure‐sensitive device is a strain gauge, the output of which is plotted as a function of time by a cathode‐ray oscilloscope. The apparatus was tested for complete mixing and desaturation of the gas from the liquid phase by means of a reaction known to be very fast. The reaction chosen was the homogeneous reaction between the permanganate ion and hydrogen peroxide in acid solution.The reaction between lithium borohydride and sulfuric acid was found to have a half‐time of approximately one second. The half‐time of the reaction between sodium‐potassium alloy and ethanol was only a few milliseconds. The reactions of aluminum borohydride and ethylaluminum sesquihydride with water and with acids also were studied.

ISSN:0034-6748    

DOI:10.1063/1.1746012

出版商:AIP    

年代:1951

数据来源: AIP