摘要:
A cryogenic cooler and a dewar assembly including a cooled surface; a cooling surface for removing thermal energy from said cooled surface; and an adapter disposed between said cooling surface and the cooled surface for conducting thermal energy therebetween. A first fluid is disposed between the cooled surface and the adapter for conducting thermal energy from the cooled surface to the adapter. A second fluid is disposed between the cooling surface and the adapter for conducting thermal energy from the adapter to the cooling surface whereby the cooling surface remains free to move axially relative to the adapter at a temperature of the cooling surface at which the first fluid is susceptible to freezing. This allows for movement of the cold finger relative to the dewar and adapter, due to differential thermal coefficients of expansion or support structure motion, without adversely affecting the communication of thermal energy from the load. In the illustrative embodiment, the cooler is a Stirling cycle cooler, the first fluid is thermal grease and the second fluid is nitrogen. The cooling surface is a cylindrical cold finger of the Stirling cycle cooler and the cooled surface is an inner wall of a dewar assembly. The dewar is in thermal contact with a load. The adapter is disposed between the inner wall of the dewar and the cold finger. The adapter has an end cap and a cylindrical housing extending therefrom. The housing extends at least partially along a longitudinal axis of the cold finger. An insulator is disposed about the cold finger and the adapter housing. A spring is disposed between a proximal end of the insulator and a base of the cold finger to maintain a distal end of the insulator in contact with the adapter and the adapter in contact with the dewar.
摘要:
Polyurethane/expanded porous polytetrafluoroethylene composite coatings show unexpectedly high resistance to ionizing radiation when they contain a hindered phenol.
摘要:
A novel composition comprises a block copolymer of a polyetheramide, e.g., poly-(4,7-dioxadecamethylene adipamide) and a random copolymer resulting from the polymerization of an ether free polyamide precursor, e.g., hexamethylenediamine salt of adipic acid and a precursor of a polyetheramide. The block copolymer can be more easily processed into useful articles such as fiber and film because it differs structurally from a corresponding block copolymer of homopolymers of polyetheramide and polyamide.
摘要:
Particulate foamed fertilizers and combination products in which other active ingredients are combined with such fertilizers. Methods and apparatus for making foamed fertilizers and combination products in which provision is made for combining ingredients, curing, drying, and comminuting the material thus obtained, separating and agglomerating fines and adding them to the comminuted product, and incorporating active ingredients into the comminuted product.
摘要:
Novel block copolymer formed by melt blending a melt spinnable polyamide, such as nylon-6, and a poly(dioxa-arylamide), such as poly(4,7-dioxadecamethylene terephthalamide) (also known as N-30203-T), is disclosed. Said copolymer has utility as a fiber. The fiber of a block copolymer, for example of nylon-6 and said poly(dioxa-arylamide) which is also known as N-30203-T/6, has superior moisture absorption and initial modulus characteristics than that of nylon-6. Furthermore, resulting fiber still substantially maintains the other desirable properties of the major constituent, for example, nylon-6.
摘要:
Novel block copolymer formed by melt blending a melt spinnable polyamide such as nylon-6 and a poly(dioxa-amide) such as poly(4,7-dioxadecamethylene adipamide) which is also known as N-30203-6 is disclosed. Said copolymer has utility as a fiber. The fiber of disclosed copolymer, for example, of nylon-6 and said poly(dioxa-amide) has moisture absorption characteristics similar to that of cotton. Resulting copolymer is also known as N-30203-6//6. Furthermore, the resulting fiber still maintains the other desirable properties of the major constituent, for example, nylon-6.
摘要:
An improved method of transmitting power in a hydraulically operated mechanism which comprises adding to the operative liquid a certain amount of a tertiary diamide having the following structural formula: ##EQU1## wherein ##EQU2## and wherein R R H, alkyl radical having C.sub.1 -C.sub.5m = 2-8x = 1-5The tertiary diamide imparts to the liquid the property of swelling seals in the mechanical system and thereby prevents leakage.
摘要:
A winch drum including a barrel portion having composite flanges secured at each end. The flanges including two or more partially independent, segmented, modules with each modular section placed diametrically one on the other thus forming an expanding concentric flange. The first modular section secured to the winch drum, barrel portion having a relatively small outside diameter with respect to the barrel is treated, from a design standpoint, as the primary shear module. The second and subsequent concentric sections are only secured to the lower modular section at their outer faces and treated independently for shear and bending with each cross section being sized to accommodate the forces applicable only to that modular section thus reducing shear and bending in these modules.
摘要:
A process for providing yield enhancement of canned tuna fish. A dry storage hydrolyzed caseinate product is firstly produced by firstly providing acid precipitated casein. The acid precipitated casein is agitated with hydroxide solution while maintaining the mixture substantially dry. The mixture is allowed to cool to ambient temperature and a dry enzyme is uniformly distributed therein in a ratio of at least 0.1% by weight. A broth is subsequently formed by dispersing the dry hydrolyzed caseinate in a 5-10% by weight aqueous dispersion. The dispersion is heated to a temperature in the range of approximately 160.degree. F. to 190.degree. F. and used to effect enhanced yield of precooked tuna fish to be subsequently canned.
摘要:
Semipermeable membranes useful in membrane separation processes are formed from a hydrophilic polyamide which is a block copolymer of nylon and a poly(dioxa-amide) such as poly(4,7-dioxadecamethylene adipamide).