Materials Literature
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Abstract Two commercial sealing alloys (Kovar® and Ceramvar® were tested in high pressure hydrogen, or after exposure to hydrogen gas for up to 17,500 h. All hydrogen pressures were 69 MPa. In no case was any ductility loss observed. It was therefore concluded that these alloys are probably safe for use in gas handlin…
Abstract The maximum at 220 nm in the circular dichroism spectrum of native collagen solution changed to a negative value after heat denaturation or collagenase hydrolysis. The enzyme induced rate of CD change at 220 nm was shown to be first order in collagen concentration. The specific rate constant k is actually a c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlash photolysis of potassium tris(oxalato)cobaltate(III)L. Cordemans, J. Olieslager, J. Hendrix, and S. De JaegereCite this: J. Phys. Chem. 1974, 78, 14, 1361–1367Publication Date (Print):July 1, 1974Publication History Published online1 May 2002Published inissue 1 July 197…
Abstract Thin films of poly(ethyl acrylate) and poly( n ‐butyl acrylate) were decomposed in vacuo by means of a high pressure Hg lamp, and the rate of development of volatile products was measured. The main gaseous products were CO, CO 2 , and the alcohol, aldehyde, alkane, and formate derived from the respective este…
Abstract Bi2(SO4)3 begins to decompose at 465°C, and the decomposition process of Bi2(SO4)3 can be represented as follows: Bi2(SO4)3\xrightarrow465°CBi2O3·2Bi2(SO4)3\xrightarrow550°C2Bi2O3·Bi2(SO4)3\xrightarrow580°C7Bi2O3·2Bi2(SO4)3\xrightarrow830°C12Bi2O3·Bi2(SO4)3\xrightarrow880°C28Bi2O3·Bi2(SO4)3\xrightarrow920°CBi…
The characteristic ferroelectric dispersion of the dielectric constant of AgNa(NO 2 ) 2 is measured near the ferroelectric phase transition. In accordance with other works an extremely slow relaxation is observed which can be related to a thermally activated motion of the electrical dipoles. The nuclear spin lattice r…
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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=…