摘要:

The design and construction of a programmable seven‐decade resistor which interfaces with the IEEE 488 bus is described. Off‐the‐shelf commercial manually set decade units are modified for computer control. TTL logic circuitry is used to drive mercury‐wetted reed relays which set the decades. The system controller is a Commodore PET (16K) personal computer.

ISSN:0034-6748    

DOI:10.1063/1.1137269

出版商:AIP    

年代:1983

数据来源: AIP

摘要:

A new technique for junction depth measurements of silicon solar cells is described. The technique essentially consists of repeated anodization and etching of the surface layer followed by electrical measurements. The advantages of the technique are discussed and illustrative results are presented.

ISSN:0034-6748    

DOI:10.1063/1.1137270

出版商:AIP    

年代:1983

数据来源: AIP

摘要:

Vortical motion of liquids in tubes, for the purpose of mixing or evaporation in small‐scale chemical process streams, is produced by a magnetically coupled digital drive mechanism. The latter consists of an eight‐pole stator, to which a continuously commutating magnetization is applied, one pole at a time, and a rotor consisting of a magnetically soft steel ring surrounding and fixed to the liquid‐containing tube. The power to the stator windings is controlled by MOSFET transistors driven directly by a CMOS counter decoder. The clock signal is derived from the 60‐Hz ac line, eliminating the need for a filtered power supply.

ISSN:0034-6748    

DOI:10.1063/1.1137271

出版商:AIP    

年代:1983

数据来源: AIP

摘要:

An optical cell for gases or liquids, with three windows, for pressures up to 1000 bar and temperatures between 10 and 300 K is described. Design criteria and results of performance tests are also presented.

ISSN:0034-6748    

DOI:10.1063/1.1137272

出版商:AIP    

年代:1983

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1137200

出版商:AIP    

年代:1983

数据来源: AIP