ISSN:0947-076X    

DOI:10.1002/vipr.19930050102

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

ISSN:0947-076X    

DOI:10.1002/vipr.19930050103

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractSide channel machines have lots of advantages which enable their use in many different industrial applications. This article explains the technical and theoretical principles and pump characteristics of this kind of machines.

ISSN:0947-076X    

DOI:10.1002/vipr.19930050104

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractPolymer Compounding is the link between polymer synthesis and the conversion to the final part. Besides well known processing tasks such as Melting, Mixing, Homogenisation and Pelletisation, the Devolatilisation of volatile components such as air, moisture, monomers, oligomers and solvents represents a major aspect of the compoundig technology. Increasing demands for cleaner polymer parts and requirements for less environmental impact will augment the importance of this process task in polymer compounding.

ISSN:0947-076X    

DOI:10.1002/vipr.19930050105

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractWe can see clear indications that the traditional HV‐Thin Film processes today, to a greater extent than earlier, are conducted in UHV reactors. The reduced background‐pressure makes it possible to produce better layers with less impurities and with sharp interfaces. UHV conditions also bring possibilities of in‐situ analysis. We acknowledge that the advantages are mainly those concerning inorganic device issues. There are also numerous other possibilities for growing organic materials, however this field of science is in an initial stage. In order to exchange practical experience in the field of Vacuum System Design, more contact is needed between the Thin Film Research community and the Nuclear Physics and Surface Analysis G

ISSN:0947-076X    

DOI:10.1002/vipr.19930050106

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractA wide spectrum of todays vacuum applications are asking for custom taylored, hightech products, which of course require for highest uptime and optimal utilization certain maintenance and to follow operational advices. From a prospectus and experience of a components' manufacturer, the following article would like to give you helpful advices for the use, maintenance and proper system integration for the most common vacuumpumps utilized and to realize the lowest cost of ownership.

ISSN:0947-076X    

DOI:10.1002/vipr.19930050107

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

ISSN:0947-076X    

DOI:10.1002/vipr.19930050108

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

摘要:

AbstractIn the common design of a thermal conductivity vacuum gauge according to Pirani, a thin wire is heated by an electric current and the heat loss from the wire by the heat transfer of the surrounding gas is used to derive the gas pressure. Other mechanisms of heat loss are the thermal conductivity of the wire, which transports heat to its cold ends, and the thermal radiation. In the present paper the various mechanisms of heat loss in an axially symmetric setup are investigated in detail and described by analytical formulae. Operation of the sensor by a regulated power supply allows to keep the electrical resistance of the wire and thus the mean wire temperature constant. However, changes in gas pressure affect the temperature profile along the wire and, concomitantly, the heat transfer by the wire towards its ends and the loss by thermal radiation. Experimental data of the heating power vs. pressure obtained with nitrogen and hydrogen in a typical setup are presented and compared with calculated values.

ISSN:0947-076X    

DOI:10.1002/vipr.19930050109

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

ISSN:0947-076X    

DOI:10.1002/vipr.19930050110

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY

ISSN:0947-076X    

DOI:10.1002/vipr.19930050111

出版商:WILEY‐VCH Verlag    

年代:1993

数据来源: WILEY