Polymeric heat pipe wick

A wick for use in a capillary loop pump heat pipe is described. The wick material is an essentially uniformly porous, permeable, open-cell, polyethylene thermoplastic foam having an ultrahigh average molecular weight of from approximately 1 to 5 million, and an average pore size of about 10 to 12 microns. A representative material having these characteristics is POREX UF, which has an average molecular weight of about 3 million. This material is fully compatible with the FREONs and anhydrous ammonia and allows for the use of these very efficient working fluids in capillary loops

Low outgassing polydimethylsiloxane material and preparation thereof

A fluid polydimethylsiloxane resin having improved outgassing properties in the cured state is described. The fluid resin is obtained by pouring, to a height of up to about 2 inches a starting polydimethylsiloxane resin such as RTV-602 silicone resin and devolatilizing the starting resin at a temperature of about 125 to 150 C under a vacuum of at least 0.00001 torr

Ceramic heat pipe wick

A wick for use in a capillary loop pump heat pipe is disclosed. The wick material is an essentially uniformly porous, permeable, open-cell, silicon dioxide/aluminum oxide inorganic ceramic foam having a silica fiber ratio, by weight, of about 78 to 22, respectively, a density of 6 lbs/cu ft, and an average pore size of less than 5 microns. A representative material having these characteristics is Lockheed Missile and Space Company, Inc.'s HTP 6-22. This material is fully compatible with the freons and anhydrous ammonia and allows for the use of these very efficient working fluids, and others, in capillary loops

Devolatilization of polymer resins

Commercial silicon resin was devolatilized by vacuum distillation, cured at room temperature and tested favorably for outgassing criteria. Applications of the devolatilized resin are potting compounds and conformal coatings

An Examination of an Alternative Use for the Fear-Potentiated Startle Paradigm and the Effects of Angiotensin Type 1 Receptor Inhibition on Extinction Learning

Background – PTSD is a chronic and debilitating mental illness with limited available treatments. New medications, including Angiotensin Type 1 Receptor inhibitors, have been found to improve extinction learning retention in rodents and could be a means of improving the efficacy of exposure and cognitive based therapies for PTSD and other anxiety related disorders. Studies of new medications use an ideal model of extinction that does not mirror the inconsistencies of human therapy and recovery. The present experiment attempted to model the inconsistent nature of exposure therapy and examine whether the AT1R inhibitor, losartan, would still improve extinction learning. Methods – Using the fear-potentiated startle paradigm as an extinction paradigm, the study investigated whether acute treatment with losartan, an angiotensin type 1 receptor inhibitor, could still augment extinction retention. Following Pavlovian fear conditioning, an animal model for PTSD, subjects were treated to losartan and tested for extinction learning over the course of two days. Results – Groups treated with losartan showed consistent significant fear-potentiated startle in both tests following initial fear conditioning. In contrast, groups treated with saline did not show significant changes in fear-potentiated startle or trend towards a significant increase in startle reactivity on either day. Conclusions – The significant increase exhibited by the group treated with losartan could be an implication that losartan could augment fear memory as well as extinction retention, but further study will be necessary to confirm whether the Fear-Potentiated Startle paradigm can truly demonstrate fear extinction in animals

Ausprägungen und Einsatzbedingungen inkrementaler Managementansätze : Diskussionspapier

In diesem Diskussionspapier werden die inkrementalen Managementansätze Strategie der unkoordinierten kleinen Schritte (Braybrooke/Lindblom), Logischer Inkrementalismus (Quinn), Stückwerk-Technik (Popper) und Kaizen (Imai) dargestellt, vergleichend analysiert und dem synoptischen Problemlösungsmodell gegenübergestellt. Auf der Basis einer Typologie von Problemsituationen sowie der Unterscheidung zwischen degenerativen und progressiven Problemverschiebungen wird der Weg zu einer allgemeinen Zuordnung von Problemsituationen zu jeweils geeigneten Problemlösungsmodellen aufgezeigt

Connections on modules over quasi-homogeneous plane curves

Let k be an algebraically closed field of characteristic 0, and let $A = k[x,y]/(f)$ be a quasi-homogeneous plane curve. We show that for any graded torsion free A-module M, there exists a natural graded integrable connection, i.e. a graded A-linear homomorphism $\nabla: \operatorname{Der}_k(A) \to \operatorname{End}_k(M)$ that satisfy the derivation property and preserves the Lie product. In particular, a torsion free module N over the complete local ring $B = \hat A$ admits a natural integrable connection if A is a simple curve singularity, or if A is irreducible and N is a gradable module.Comment: AMS-LaTeX, 12 pages, minor changes. To appear in Comm. Algebr