Materials Literature
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The resistance change along a ring, prepared by photoetching a thin flat film evaporated on a glass substrate, is analized and the resistivity anisotropy is separated from the effect of thickness gradient. It is found that in thin films of 84.5% Ni-Fe the resistivity anisotropy coefficient β, defined as β=(ρ // -ρ ⊥ )…
Iridium is used extensively as a material for crucibles containing oxide melts during single crystal growth because of good chemical compatibility with them in slightly oxidising atmospheres. With care, iridium crucibles can be used in this way for long periods.
Rubbing surfaces of critical components for the coming generation of the nation's liquid–metal-cooled fast-breeder reactors must withstand severe environments of high temperature, liquid–metal corrosion, and nuclear irradiation. For some component requirements, the use of the better known bearing materials and hardfac…
Abstract The thermal degradation of several halogen-containing polymers in air was studied by means of the TBA(Torsional Braid Analysis) method and IR spectroscopy. The samples were poly(vinyl chloride)(PVC), vinylidene chloride-vinyl chloride copolymer(PVdC-VC), poly(vinyl fluoride)(PVF), poly(vinylidene fluoride)(PV…
A small depression (about 80 Å) was observed when As–S thin films were exposed to a xenon 500-W lamp. The depression is considered to be a structural change in amorphous As–S.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptimization of alkyl modifications by Fibonacci searchThomas M. BustardCite this: J. Med. Chem. 1974, 17, 7, 777–778Publication Date (Print):July 1, 1974Publication History Published online1 May 2002Published inissue 1 July 1974https://pubs.acs.org/doi/10.1021/jm00253a033ht…
Abstract In the upper‐ and middle‐Coastal Plain of North Carolina, Paleudults are on the old landscapes; Hapludults, with low base status, are on the young valley side slopes. This distribution of soils suggests a parent‐material control of soil development. X‐ray and petrographic analyses of samples of the surficial…
Publis he d data a re used to deve lop fa c tors for predic ti ng the viscos it y-te mpe rature re la tion s hip from th e compos iti ons of "soda-lim e" t ype silicate glasses at s pec ifi c t e mpe ratures in th e range of 600 t o 1300 0c. Th e effec ts of Na2 0. K, O . CaO. MgO. AI, O" an d th eir int e rac tion s…
GJas s transition mea s urem e nts on monodi spersed polystyre ne s of diffe re nt molec ular we ight a nd their binary mixtures res ult in th e following co nclu sions: (a) th e effect of molec ular we ight on th e gJa ss tran s iti ons of monodispe rsed sa mpl es sa tisfies th e F ox and Flory e quation writt e n as…
Abstract Polybenzimidazoles were prepared in poly(phosphoric acid) from isophthalic, m ‐ and p ‐phenylene diacetic, succinic, adipic, suberic, and sebacic acids and 3,3′‐diaminobenzidine, 3,3′,4,4′‐tetraaminodiphenyl ether and 3,3′,4,4′‐tetraaminodiphenylmethane. The thermal, mechanical, and bonding properties were st…
Abstract The photoelectron spectra of TCNE and TCNQ in the gaseous state were measured by stimulating with He I resonance line. The first ionization potential is determined to be 11.77 eV for TCNE and 9.61 eV for TCNQ. The interpretations of the observed photoelectron spectra are carried out with the aids of the photo…
The relative moisture uptake characteristics of ring and open-end yarns are investigated by a variety of methods. Wicking height and volume of moisture elevated differ as the yarn structure is altered. Open-end yarn wicks better and more evenly but only elevates about the same volume of water for a given yarn count as…
The structural consequences of dipolar resonance forms of the pentafulvenes have been studied for 6-(N,N-dimethylamino)pentafulvene (NMEFUL) and 2-formyl-6-(N,N-dimethylamino)pentafulvene (AMFORF). NMEFUL: P2x2121; a=5-872, b= 17-293, c=7.273 A; Z=4. AMFORF: P1; a=9.793, b= 11.971, c= 7.608 A, e= 91-90, fl= 110.03, y=…
Abstract Growth and dissolution rates of nickel sulfate α‐hexahydrate were measured as functions of the concentration driving force in a laboratory‐scale fluidized‐bed crystallizer for the temperature range 35° to 50°C and the crystal size range 0.5 to 4.0 mm. Dissolution rates at a given temperature and crystal size…
Potassium borate glasses of the tetraborate composition, K20.4B203, may be crystallized to give a compound of the composition K20.38B203 or 5K20.19B203. This phase is monoclinic, space group C2/c, with unit-cell dimensions at 22 °C: a = 17.888 _+ 0.002, b = 11.479 _+_ 0-001, c = 12-973 _+ 0-002 A, fl = 95.52 +_ 0.01 °…
Abstract Our overall objective in presenting this review is to call attention to the very complicated nature of the entire disposal problem. The whole field of scrap-tire disposal is full of alternatives, compromises, legislation, and conflicting reports on technological success. We will present a brief historical sec…
The type of recovery behavior to be expected from a previously presented model for fabric bending and creasing is examined. This model consists of a generalized linear viscoelastic element in parallel with a frictional element. The linear viscoelastic element is characterized by the bending relaxation rigidity B( t A…
The distortion of an observed coordination polyhedron can be evaluated from a comparison of this polyhedron with the least-squares best-fit polyhedron with optimum location, orientation, size parameters and prescribed symmetry. A set of atoms at positions, x(1) .... x(n), may be fitted to the set y(1) .... y(n) by rea…
The synthesis of keratin proteins during development of the embryonic chick feather was studied by quantitative gel electrophoresis of the reduced and carboxymethylated proteins. The results demonstrated a coordinated synthesis of the major keratin proteins, during and after the onset of keratin synthesis. The results…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of low-spin cobalt porphyrins. VI. Molecular stereochemistry of (1,2-dimethylimidazole)-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatocobalt(II)Patrick N. Dwyer, Paul Madura, and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1974, 96, 15, 4815–4819Publi…