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。
Abstract Glauconite-smectite and illite-smectite interlayered minerals are compared by various means in an attempt to establish the mineralogical relations between the two groups. Experiments at 2 Kb pressure and 200–350°C are reported as well as microprobe scans of pelletal glauconites. This new information is used a…
The magnetic susceptibitlity of 243AmO2 from 2.2 to 97 °K. The sample showed an antiferromagnetic transition at 8.5±0.5 °K and to regions of temperature-dependent paramagnetism above 15 °K. (AIP)
The growth of Brucella abortus (US-19) in a complex tryptose-yeast extract medium containing D-glucose is inhibited by 10 mM erythritol. The enzymes of the erythritol pathway, except for D-erythrulose 1-phosphate dehydrogenase (D-glycero-2-tetrulose 1-phosphate:nicotinamide adenine dinucleotide (NAD+) 4-oxidoreductase…
Summary Using the acetylene reduction technique, nitrogen fixation was measured in Rocky Creek, a small seasonally dry Californian stream. In the 3 years since 1970 nitrogen fixation varied seasonally and spatially, being highest in the early stages of colony growth in shallow, clear regions where there was little sha…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The ESR spectra of ${\mathrm{Rb}}^{+}$TCN${\mathrm{Q}}^{\ensuremath{-}}$, of ${\mathrm{K}}^{+}$TCN${\mathrm{Q}}^{\ensuremath{-}}$, and of TM${\mathrm{B}}^{+}$ (tri-methyl-benzimidazolium) TCN${\mathrm{Q}}^{\ensuremath{-}}$ were measured. The observed dipolar splittings unequivocally prove that the ESR signals derive f…
A number of polytypes, existing over short intervals of structure, have been observed in enstatites. These include the27,36, and 54 A periodicities, in addition to the well known 9 A monoclinic enstatite (CLEN) and l8 A orthorhombic enstatite (OREN) polymorphs. The polytypes, as well as all other features described in…
Abstract New developments on photochromic polymers have been obtained with systems containing spirobenzopyran derivatives. The importance of the chemical incorporation of the photochrome within the polymer backbone is stressed, and the influence of matrix orientation on the rate of fading is shown. Well known fatigue…
Abstract The crystallinity of minerals in terms of crystallite size distribution and lattice perfection is quantified by means of statistical measures derived from X-ray line profiles (2 σ values). A low degree of crystallinity facilitates the non-stoichiometric incorporation of foreign elements in the crystal lattice…
This paper presents a classification scheme for tetrahedrally-coordinated oxides of formulae Li 3 XO 4 : X = P, As, V, Cr, Mn; AYO 2 : A = Li, Na; Y = Al, Ga, Fe, (not LiFeO 2 ) and A 2 BCO 4 : A = Li, Na; B = Be, Mg, Mn, Fe, Co, Zn, Cd; C = Si, Ge, (not all ABC combinations). These oxides are usually polymorphic and…
A previous calculation of the band structure of trigonal V2O3 and Ti2O3 by Nebenzahl and Weger is improved, taking a more rigorous treatment and including the effect of covalency. The agreement obtained with experimental results is good. It is found that the width of the 3d band is about 9 eV for V2O3 and 11 eV for Ti…
The superstructure of PPO/iPS blends, in which the iPS is partially crystallized from the glassy state by thermal treatment, is studied as a function of composition. A superstructure model, based on Hosemann’s treatment of a linear paracrystalline lattice, is used in order to calculate theoretical SAXS curves and fit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilute single-crystal electron paramagnetic resonance study of bis(cyclopentadienyl)vanadium pentasulfide, V(.eta.5-C5H5)2S5. Coup de grace to the Ballhausen-Dahl bonding model applied to M(.eta.5-C5H5)2L2-type complexesJeffrey L. Petersen and Lawrence F. DahlCite this: J. A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance studies of cation orientation in restricted water layers on phyllosilicate (smectite) surfacesMurray B. McBride, T. J. Pinnavala, and M. M. MortlandCite this: J. Phys. Chem. 1975, 79, 22, 2430–2435Publication Date (Print):October 1, 1975Publication Hi…
Chemical processes occurring in the vapor deposition of silicon from and in the etching of silicon by were studied by means of a mass spectrometer coupled to the CVD reactor. This setup was successfully used for the qualitative and quantitative analysis of the composition of the vapor phase in the Si‐Cl‐H system. Spec…
The incorporation of lattice dislocations into high-angle grain boundaries either with small radii of curvature or absorbing lattice defects is observed by the in situ heating of thin foils in a transmission electron microscope. At a given temperature, the rate of incorporation is higher than for equilibrium boundarie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall anion binding to cycloamylose. Equilibrium constantsJ. F. Wojcik and R. P. RohrbachCite this: J. Phys. Chem. 1975, 79, 21, 2251–2253Publication Date (Print):October 1, 1975Publication History Published online1 May 2002Published inissue 1 October 1975https://pubs.acs.or…
The high intensity x-ray flux from the synchrotron radiation at the Stanford Synchroton Radiation Project has been used to study the extended x-ray absorption fine structure (EXAFS) of the iron-sulfur protein Peptococcus aerogenes rubredoxin. Absorption measurements were made from 7080 eV, which is below the K-edge of…
Interdiffusion in the Ti/Pd/Au thin-film system is measured using Rutherford backscattering. Interdiffusion rates of Pd/Au for temperatures between 200 and 490 °C have been correlated with the defect structure of the films using models of defect enhanced diffusion. Au diffusing in Pd has been analyzed by the Whipple m…
A comparison is presented of the results of intergranular (IG) corrosion testing by the standard method (ASTM A 262, Practice E) and by an electrochemical reactivation method. Five Cr-Ni and Cr-Ni-Mo steels containing 0.025 to 0.09% C were tested. Discrepancies between the classical and the electrochemical test are ac…