Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
The two species of Eurycercus are largely allopatric in the Northern Hemisphere, glacialis tending to be peripheral in distribution in the far north, occurring only as far south as 51‐52° N in the outer Aleutians, Labrador, and the northern Kuriles. There are vigorous disjunct populations of unknown history in oligotr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of the urea-guanidinium class of protein denaturants on water structure: heats of solution and proton chemical shift studiesJagdish C. Ahluwalia, Sankaran. Subramanian, T. S. Sarma, and D. BalasubramanianCite this: J. Phys. Chem. 1971, 75, 6, 815–820Publication Date…
The infrared spectrum between 4000 and 200 cm−1 of polycrystalline D2O2 at − 190°C corresponds to that of H2O2 indicating that the crystal structure and spiral chain coupling of excitons for each of the six normal modes are the same in D2O2 as in H2O2. At temperatures near − 100°C the crystal spectra of both H2O2 and…
Summary The main methods in use in laboratories for the microbiological assessment of surfaces are examined, viz. (1) the swab‐rinse, (2) the rinse, (3) the agar contact, and (4) the direct surface agar plating. The advantages and disadvantages of these are discussed and their suitability for particular purposes in th…
Summary The crystal structure of kilchoanite, Ca 6 (SiO 4 )(Si 3 O 10 ), has been determined from three- dimensional X-ray methods ( r = 0·089 on 348 independent reflections). It is closely related to that of γ -Ca 2 SiO 4 , which is olivine-like. In kilchoanite, slabs of γ -Ca 2 SiO 4 structure alternate with ones co…
The susceptibility of high purity Fe-Cr alloys containing 17 to 26% Cr and 0 to 1% Mo has been determined by the Huey test after subjecting the alloys to various heat treatments. The alloys are highly resistant to intergranular corrosion when 0.15 cm thick specimens are water quenched from temperatures between 954 C (…
Abstract The dislocation behaviour in deformed copper single crystals was previously shown to correspond to a lower local flow stress in the surface region than in the interior and the primary glide plane was found to undergo a characteristic bending in the surface region, reflecting a local excess density of unpaired…