摘要:

A simple device is described for rapidly cycling apparatus between 300 and ∼1 K within a helium storage Dewar. The arrangement is useful for testing components or conducting experiments over this temperature range when the apparatus to be cooled is less than 5 cm in diameter and 50 cm long. Helium evaporation on inserting the device is ∼0.2 l, with consumption ∼0.1 l/h during operation.

ISSN:0034-6748    

DOI:10.1063/1.1137965

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

The design of a novel sample transfer device for use in surface studies in an ultrahigh‐vacuum environment is discussed. The principle feature of this design is a broad sample temperature range (∼32–∼1270 K).

ISSN:0034-6748    

DOI:10.1063/1.1137966

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

A simple electro‐optical system has been developed for measuring successive angular displacement cycles of a damped torsion pendulum. The system permits convenient, reproducible measurements of the air/liquid interfacial viscosity of aqueous surfactant systems.

ISSN:0034-6748    

DOI:10.1063/1.1137967

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

This work describes a microprocessor‐based data acquisition and analysis of a far infrared (FIR) spectrophotometer. The work shows how a microprocessor can be used to renovate an old instrument (a Beckman FS720 FIR spectrophotometer) into a modern and versatile instrument.

ISSN:0034-6748    

DOI:10.1063/1.1137968

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

A simple vacuum pump exhaust filter based upon an automotive air cleaner has been constructed and tested. The major virtues of the filter system are ease of coupling to an external exhaust and the availability of filter elements.

ISSN:0034-6748    

DOI:10.1063/1.1137969

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

A reliable slip‐on vacuum coupling scheme for low‐temperature applications is described. The novel aspect of this concept is the use of silicone fluid as the sealing agent. The stem and coupling joint described has performed without failure at room temperature, immersed in normal4He and in superfluid4He.

ISSN:0034-6748    

DOI:10.1063/1.1137970

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

Various electrolytes were used to deposit LaB6on carburized tantalum by the cataphoretic method. The effect of four electrolytes viz., HCl, NH4NO3, La(NO3)3, and HNO3on LaB6coatings has been investigated. It is observed that use of HCl as an electrolyte provides LaB6coatings with small grain size, low porosity, good adhesion, and ability to withstand a large number of thermal shocks. These properties make HCl the most suitable electrolyte for cataphoretic deposition of LaB6for thermionic emission.

ISSN:0034-6748    

DOI:10.1063/1.1137944

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

A retractable capillary doser is described which can place a reproducible coverage of molecules on a substrate in an ultrahigh‐vacuum environment. An integral valve assembly controls the flow of molecules from the doser volume to the substrate. Automatic operation is achieved by controlling the valve and the position of the doser orifice from a commercial IEEE interface.

ISSN:0034-6748    

DOI:10.1063/1.1137971

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

A simple UHV offset manipulator is described that not only allows a target crystal to be moved to any point on a circle centered on the manipulator axis but also provides indepedent &thgr; and &fgr; rotations at each position.

ISSN:0034-6748    

DOI:10.1063/1.1137941

出版商:AIP    

年代:1984

数据来源: AIP

摘要:

A novel approach to the linearization of transducer outputs is presented based on polygonal fitting of the transducer function. A circuit for realizing this approach is included. Use of this circuit with the typeKthermocouple results in excellent linearization.

ISSN:0034-6748    

DOI:10.1063/1.1137942

出版商:AIP    

年代:1984

数据来源: AIP