By H. Adam

1965 Transactions of the 3rd foreign Vacuum Congress, quantity 1: Invited Papers is the 1st of two-volumes that assessment the nation of data in vacuum expertise. the current quantity contains the outlet tackle via Prof Auwárter and the twelve accomplished major lectures. in line with the aim of a world congress, the organizers took nice pains to make sure that the alternative of issues for the most lectures not just lined the medical basics as a complete, but in addition gave applicable attention to the technical functions.
An research of the submitted themes indicates that the powerful issues of study and improvement lie within the fields of ""Coating and skinny Layers"", ""Adsorption and Desorption,"" and ""Pressure size and Leak Detection"". within the fields of software, ""Vacuum Metallurgy"" ranks hugely. The papers released within the transactions originate from many eu and in a foreign country international locations, evidence that vacuum technological know-how isn't just keenly pursued in all significant commercial international locations, but additionally that the recent organizational kind of the IUVSTA is in a position to successful the prone of a lot of these nations for fruitful foreign cooperation within the vacuum box.

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In analoger Weise ergibt sich in Abhángigkeit von p0 auch ein Maximum der positiven Entmischung, das nach früheren Messungen für die in Abb. 11 darges tell ten Versuche allerdings erst bei Verminderung des Einlassdruckes auf p0 = 8 Torr erreicht würde27. Nach den früherne Messungen sind die zum Maximum der positiven Entmischung führenden Strõmungsbedingungen allgemein dadurch charakterisiert, dass die Knudsen-Zahl in der Düsenmündung K* » 0,03-0,04 betrágt^, 27, 28. Bei Expansionsverháltnissen in den Grõssenordnungen 10 bis IO3 entspricht diese Bedingung charakteristischen Knudsen-Zahlen hinter dem Mach'schen Verdichtungsstoss von K & 0,3-2.

X = 7/520. Die durchgezogenen Kurven gelten für einen von der Temperatur unabhángen Wirkungsquerschnitt a; bei der gestrichelten Kurve wurde a (7") entsprechend der Temperaturabhàngigkeit der Zàhigkeit von He zugrundegelegt. Die Messpunkte stammen aus Molekularstrahlversuchen von Fenn und Mitarb15. (Ar,A) sowie von Bier u. Hagena16. Aus Abb. 9 folgt als allgemeines Ergebnis, dass die experimentellen X*-Werte, mit denen eine bestimmte Mach-Zahl MF erzielt wurde, hõchstens um den Faktor 2-3 von den theoretischen Werten abweichen, die unter der Voraussetzung eines temperaturunabhangigen Wirkungsquerschnittes aus dem Einfrierkriterium hergeleitet wurden.

R Schütte, Z Naturforschg, 18a, 246 fl963J. 26 F Zigan, Z Naturforschg, Ma, 772 (1962; sowie F Zigan, Dissertation, M a r b u r g 1958. In diesen Arbeiten wird gezeigt, dass innerhalb des frei expandierenden Strahls der Beitrag der Thermodiffusion zur Entmischung von verschieden schweren Komponenten im Vergleich zur Druckdiffusion zu vernachlássigen ist. 27 P T u r o w s k i , Diplomarbeit, M a r b u r g 1958. 2 8 E W Becker, K Bier u. W Bier, Z Naturforschg, Ma, 778 (1962;. 2 9 P C W a t e r m a n u.

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