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 Two principally different molecular structures in the crystalline state are known from the copper (II) complex with 7-hydroxy-4-methyl-5-aza-hept-4-en-2-on. The magnetic susceptibilities of three forms of this compound [α-(CuEIA) 4 , β-(CuEIA) 4 , and β-(CuEIA) 4 ·2 C 6 H 6 ] have been measured in the tempera…
Proton magnetic resonance spectra of three crystalline choline halides have been obtained over a temperature range of 77 to 440 °K. In all of these materials the line shapes are strong functions of temperature with multiple changes observed for each substance. Above 353 °K, the temperature at which a crystal–crystal p…
Eine überraschend einfache Heptalen‐Synthese besteht in der Umsetzung von Azulen ( 1 ) mit Acetylendicarbonsäure dimethylester. Die Ausbeute an ( 2 ) beträgt 15%. Die Synthese ist auch auf alkylierte Azulene anw end bar. Die detaillierte Struktur des Produktes ( 2 ) ergab sich aus einer Röntgenanalyse. magnified image
Abstract The quenching temperature dependence of the magnetic hyperfine fields at the Fe 57 nucleus in magnesium ferrite has been investigated by the Mössbauer effect technique. Since the outer absorption lines are broad and asymmetric, the average magnetic hyperfine field is calculated from the two most inner lines.…
The ferroelasticity of rare earth pentaphosphates, ReP 5 O 14 (Re : La, Ce, Pr, Nd, Sm, Eu, Gd and Tb) which belongs to the species mmmF2/m is studied by DSC, Weissenberg camera and polarizing microscope. Anomaly of heat capacity at the ferroelastic transition point (second order), ferroelastic hysteresis loop, space…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilver(I)-promoted reactions of strained hydrocarbons. Oxidation vs. rearrangementGerald F. Koser and J. Neil FairclothCite this: J. Org. Chem. 1976, 41, 3, 583–585Publication Date (Print):February 1, 1976Publication History Published online1 May 2002Published inissue 1 Febr…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text T. Hirschfeld, "Effective quantum efficiency of photodetectors for photon energies much larger than threshold," Appl. Opt. 15, 305-305 (1976) Export Ci…
Reaction in dimethyl sulfoxide of nicotinamide 8-bromoadenine dinucleotide with the disodium salt of 3-mercaptopropionic acid afforded nicotinamide-8-(2-carboxyethylthio)adenine dinucleotide, a new NAD+ analogue functionalized at the adenine C-8 position by an omega-carboxylic side chain. Carbodimide coupling of the l…
The site of crevice corrosion initiation on stainless steels has been investigated. It has been found that the initiation takes place at sulfide inclusions situated at the junction between a covering layer and the free metal surface with a portion of the inclusion covered and the rest exposed to the solution. A mechan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas chromatographic and nuclear magnetic resonance determination of linear formaldehyde oligomers in formalinWim. Dankelman and Jacq. M. H. DaemenCite this: Anal. Chem. 1976, 48, 2, 401–404Publication Date (Print):February 1, 1976Publication History Published online1 May 200…
Abstract The electron structural analysis of a Madagascar sepiolite (Ampandrandava) was carried out by selected area electron diffraction obtained from monocristals. Fourier projections, derived from the experimental intensity of Okl , hOl and hkO reflections, show that the Mg 2+ cations on the edges of the sheets are…
Abstract Two samples of cellulose (molecular weight 2.97 × 10 5 and 1.25 × 10 5 ) were transformed into carbanilates (CTC) which were then fractionated by the elution method at a constant composition of the acetone‐water elution mixture with the column temperature gradually increasing from −30°C to 30°C, and by the GP…
Abstract DSC/TG (differential scanning calorimetry/thermal gravimetry) simultaneous measurements have been carried out for needle‐like and other poly(oxymethylene) crystals and the occurrence of degradation, overlapping the melting, has been confirmed for needle‐like and fibrous extended‐chain crystals. A theory to an…
A compact formulation for the computation of the Raman tensors of vibrating molecules as a function of bond polarizabilities is presented. This formulation is conceptually clearer than those given previously and also very convenient for the numerical computation of Raman intensities. The Raman tensors of the vibration…
The core configuration and energies of the two symmetric configurations of an (a/2) [110] edge dislocation in a model MgO crystal were calculated atomistically using a point-ion or shell model with a rigid boundary region. Two short-range potentials and one set of shell-model parameters used in the present calculation…
Various crystal forms of sulphathiazole, barbitone and aspirin were compressed in a single-punch tablet machine instrumented to monitor axially applied and radially transmitted forces, and upper punch movement. The changes in radial stress during the compression cycle depended upon the polymorphic form of the compress…
Theoretical values of Rayleigh scattering amplitudes for the $K$ shell and for higher atomic shells are calculated from the second-order $S$ matrix of quantum electrodynamics. The calculations are combined with nuclear Thomson scattering to predict elastic scattering differential cross sections for photon energies bet…
Both the type I and type III collagens present in embryonic dermis are stabilized by the intermolecular cross-link, hydroxylysino-5-oxonorleucine, derived from hydroxylysine-aldehyde, although the type I collagen possesses a significant proportion of dehydrohydroxylysinonorleucine. However, concurrent with the change…
Summary The species composition of planktonic diatom crops in Loch Leven, Kinross, Scotland varied considerably over the years studied (1968–71) with centric forms predominating. Dense populations were often produced and rates of increase and decrease were high. Relations with dissolved silica did not appear always to…
The electrical conductivity of fluid selenium has been measured as a function of temperature and pressure to 1750°C and 1200 bars, respectively. The conductivity isobars exhibit strong increases to nearly-metallic behaviour in selenium above 1300°C at supercritical pressures. As the fluid is heated above 1500-1600°C t…