摘要:

Minute holes have been drilled in germanium, molybdenum, iron, copper, silver, and tungsten carbide by a new technique for machining by electrolytic etching. The flow of current is localized by a nonconducting partition in the electrolyte. The partition may be a glass tube drawn down to a tip as small as one micron diam. A variety of shapes can be produced by moving the tip with respect to the work. Holes 20 microns in diameter and 1 mm deep have been drilled; shallow grooves 2 microns wide have been made. Localized plating has also been accomplished with the technique.

ISSN:0034-6748    

DOI:10.1063/1.1715166

出版商:AIP    

年代:1955

数据来源: AIP

摘要:

A deflection transducer for dynamic studies in which the movable element has negligible inertia is described. The sensing element utilizes a light beam incident upon a photoconductive cell which is modulated by a suitably gridded film strip attached to the specimen at the desired location. The output of the photoconductive cell circuit is a varying voltage signal applied directly to a cathode ray oscilloscope. A calibration scheme is described and the results of tests are given. The data indicate agreement within 2% over the entire calibrated range of deflections.

ISSN:0034-6748    

DOI:10.1063/1.1715167

出版商:AIP    

年代:1955

数据来源: AIP

摘要:

A fast neutron detector has been developed consisting of powdered thallium activated potassium iodide dispersed in polystyrene. Recoil protons from the polystyrene are detected by potassium iodide. The detection efficiency of the potassium iodide detector for radium‐beryllium neutrons is comparable to that of zinc sulphide dispersed in polystyrene. Potassium iodide has a longer decay time than zinc sulfide, permitting ``phoswich'' coincidence arrangements. The energy response of the potassium iodide detector is closer to the energy response of a thick hydrogenous radiator than that of a zinc sulfide detector.

ISSN:0034-6748    

DOI:10.1063/1.1715168

出版商:AIP    

年代:1955

数据来源: AIP

摘要:

A fast coincidence counting system for high‐energy particle measurements combines a scintillation counter pulse‐shaping circuit and a crystal diode coincidence circuit. The system is simple and reliable. Both the resolution time of the system and the double pulse separation time of the individual counters can be as short as three millimicroseconds, with essentially one hundred percent detection efficiency.

ISSN:0034-6748    

DOI:10.1063/1.1715169

出版商:AIP    

年代:1955

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1715170

出版商:AIP    

年代:1955

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1715172

出版商:AIP    

年代:1955

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1715174

出版商:AIP    

年代:1955

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1715175

出版商:AIP    

年代:1955

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1715176

出版商:AIP    

年代:1955

数据来源: AIP