This paper presents a description of thermal analyses of forced-air ventilation and thermosyphon cooling systems, which were carried out in connection with the design of the concrete raft foundations that support hangars and other major structures to be constructed by the Department of National Defence adjacent to the existing airport near Inuvik, N.W.T. The cooling systems are required to prevent heat from the buildings from thawing the ice-rich permafrost present below the site. The analyses identified those parameters that have the most significant effect on the efficiency of each system. Based partially on the results of the analyses, it was decided to utilize air ventilation for cooling. The system is expected to perform satisfactorily under natural convection; however, the design includes a provision to install air blowers, if this should prove necessary in the future. A number of areas in which further,zesearch appears useful have been identified.Cet article prCsente une description des analyses thermiques des systkmes de ventilation d'air force et de thermosyphons qui ont CtC rCalisCes en relation avec la conception de fondations de radiers de bCton supportant des hangars et autres structures majeures qui doivent hre construites par le DCpartement de la DCfense Nationale, a cBtC de 17aCroport d71nuvik, T.N.-0. Les systkmes de refroidissernent sont nkcessaires pour empCcher la chaleur des bltiments de faire fondre le pergCliso1 riche en glace sous le site. Les analyses ont identifie ceux parmi les paramktres qui ont l'effet le plus significatif sur I'efficacitC de chaque systkme. En se basant partiellement sur les rCsultats des analyses, l'on a dCcidC d'utiliser la ventilation d'air pour le refroidissement. L'on s'attend a ce que la performance du systkme soit satisfaisante dans des conditions de convexion naturelle; cependant, la conception offre la possibilitC d'installer des ventilateurs s'ils devenaient nCcessaires dans le futur. Un certain nombre de domaines dans lesquels de la recherche semblerait utile ont Ct C identifies.

Preparation of deactivated capillaries for routine analysis Easy deactivation and pretreatment steps described in detail Comparison of different modes given Summary A new surface pretreatment for the preparation of wall-coated open tubular (WCOT) glass capillary columns has been evaluated. This technique involves the application of a non-extractable layer of SuperoxTM-4, a 4,000,000 MW polyethylene glycol, to the glass surface as a pretreatment and deactivation agent.Unlike other polyethylene glycols, Superox-4 i s stable at high temperatures (> 300%) in the absence of oxygen, coats smoothly onto a bare glass surface and resists droplet formation. WCOT columns (SE-54, Carbowax 20M, and SP-2250) prepared using this technique are compared to columns prepared using a modified Grob [2,3] BaC03 procedure. The Superox-4 pretreated columns were equal or superior in quality to the BaCO3 pretreated columns, based on the appearance of an activity standard and the effective theoretical plates (Neff) per meter. Chromatograms showing practical application of the WCOT columns prepared using both methods is given.

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