Materials Literature
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Structural changes of yeast glyceraldehyde‐3‐phosphate dehydrogenase as a function of saturation with NAD have been measured with the X‐ray small‐angle scattering technique. Samples of yeast glyceraldehyde‐3‐phosphate dehydrogenase were investigated at pH 8.5 and 40° and five different degrees of saturation with the c…
Abstract The toughness and stress corrosion cracking characteristics of an epoxy resin (DER 332) hardened with hexahydrophthalic anhydride (HHPA) were investigated. The epoxy was studied in both the bulk and bond form, and its properties were compared with an amine‐hardened (tetraethylene pentamine, TEPA) system. The…
Neutron scattering experiments on ${\mathrm{Tb}}_{2}$ ${(\mathrm{M}\mathrm{o}{\mathrm{O}}_{4})}_{3}$ show the ferroelectric orthorhombic phase to result from a phonon instability at the (\textonehalf{}, \textonehalf{}, 0) Brillouin zone corner of the parent tetragonal phase. Anharmonic coupling to these antiferroelect…
Emission and absorption spectra have been determined for Rh(III) and Ir(1II) complexes of the nitrogen ligands, ethylenediamine (en) pyridine, 2,2′-dipyridyl (dip), and 1,10-phenanthroline (phen). Emission lifetimes at 77°K in glassy solution and at room temperature have been measured. From lifetime measurements and t…
The application of thyristor switching to induction motor speed control has resulted in a number of unconventional supply systems. One such technique, which has been successfully employed in a number of applications, is variable voltage control by means of symmetrically triggered thyristors in the stator phases of a w…
A detailed study of the static and dynamic critical behavior of the planar antiferromagnet ${\mathrm{K}}_{2}$Ni${\mathrm{F}}_{4}$ is reported. The dynamic experiments reveal several unusual features. Magnons over most of the Brillouin zone are observed to persist well above ${T}_{N}$. The magnons ultimately become uno…
Metallurgical efforts to develop a soft magnetic material suitable for application in the rotor of a generator or motor in advanced aerospace electric systems are reviewed. Commercial materials which have been considered include AISI 4340 steel, H-11 steel, Nivco alloy, and 15- and 18-percent Ni maraging steels. Devel…
Summary Holtite, a new mineral allied to dumortierite, occurred as pebbles with stibiotantalite and tantalite on an alluvial tin lease near Greenbushes, Western Australia, and is named after the late H. E. Holt, Prime Minister of Australia. The mineral is orthorhombic with a 11·905 Å, b 20·355 Å, c 4·690 Å, space grou…
The phenomenon of magnetostriction, or the change in a body's dimensions during the magnetization process, was first reported by Joule. Since then, the interaction between strain and the magnetization process has been studied extensively, particularly in the magnetic metals and alloys that have been found to be of tec…
Transmission electron microscopy has been used to study the thermal annealing of radiation induced defect clusters in tungsten irradiated at reactor ambient tempeaature, ∼ 70°C. Annealing, consisting of the growth and eventual elimination of the clusters, is observed to occur in two stages, one at temperatures below 4…
Ca, N",(C O"h cr yS la lli ze, in I he o rl hnrhombi c u n il ce ll (f = 4.947( I ) A . /) = I 1.0:)2(2) A. a nd (" = 7. 108 ( 1) A al 2S oC wi lh 111' 1) formul a weip:ll is in s l' aeep:rtlup Am 1ll 2. Th" , Iru e l u re ha s bee n J"( delcrm in ed. ("o ITee l,d. a nd rdined 10 /? ".= 0.02S . /? = 0.020 u s in ~ 684…
The hyperfine field $H(\mathrm{Sn})$ at the tin sites in ${\mathrm{Ni}}_{2}$MnSn has been measured by means of the M\"ossbauer effect at 300 and 77\ifmmode^\circ\else\textdegree\fi{}K. The results, which are independent of heat treatment, have been extrapolated to 0\ifmmode^\circ\else\textdegree\fi{}K to give a satura…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of geminal diazidesRobert M. Moriarty and Paul SerridgeCite this: J. Am. Chem. Soc. 1971, 93, 6, 1534–1535Publication Date (Print):March 1, 1971Publication History Published online1 May 2002Published inissue 1 March 1971https://pubs.acs.org/doi/10.1021/…
plots, is 203 K for the quenched glass and 198 K for the annealed glass. For the glasses the heat capacity values from this research are about 1 percent higher than that reported in 1935 for natural rubber hydrocarbon. For the liquid the result from this research agrees better (within 1 percent) with recently (1967) p…
Abstract The stress‐cracking of polycarbonate by a gaseous or liquid agent results from the diffusion of this agent into the polymer. The low molecular weight polymer fractions and the chain ends within the bulk of the polymer become more ordered during the diffusion and swelling process by their partial solubility in…
It is the purpose of this paper to reexamine the interrelation between the two procedures and to ascertain relation between the two procedures and to ascertain their standing as approximate methods in chemical kinetics. The simple analysis given in this article may serve to correct some misconceptions about these appr…
Abstract Soil density and water content can be determined concurrently by measuring the attenuation of two different gamma energies. A dual source containing 241 Am and 137 Cs was shown to be suitable for these measurements. Multichannel pulse‐height analyzers were evaluated to determine their accuracy under experimen…
Magnetic measurements under hydrostatic pressure up to 8 kbar were made on f.c.c. Fe 65 (Ni 1- x Mn x ) 35 alloys in magnetic fields up to 12 kOe and at temperatures down to 4.2°K. The results indicate that in the ferromagnetic alloys ( x <0.3) the spontaneous magnetization and the Curie temperature decrease appreciab…
The determination of mesomorphic behavior was extended to cover the first sixteen members of the cholesteryl w-phenylakanoates. Microscopy and scanning calorimetry were used to identify the mesophases and to measure transition temperatures and associated latent heats. The clearing temperatures fall on two distinct cur…
Summary Soil samples were investigated from three different climatic regions of Japan. The soil profiles were well drained and consisted of a number of buried soils. Organic matter and free iron oxides were removed from the samples which were then fractionated. Laminar opaline silica particles occurring in the 0.2 to…