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。
A degenerate excited state is essential to the description of structural rearrangements which account for the relaxational heat capacity, thermal expansion, and compressibility of vitreous B2O3. These relaxational responses cannot be simultaneously described by a two-state model, or by any model involving a single ord…
Abstract The molecular orbital configuration for the ground‐state of O 2 generates the valence formula . “Increased‐valence” formulae for triatomic and polyatomic molecules have been developed recently. In them, more electrons participate in bonding than is possible for the familiar valence‐bond formulae. Using oxyhae…
Abstract The thermal stability of polyethylene containing conventional antioxidants is adversely affected by contact with copper, by certain pigments, and by the addition of a few percent of polypropylene as a processing aid. Polyethylene inhibited with 0.1% of phenolic antioxidants has approximately the same oxidativ…
Abstract Treatment of a polypyromellitimide with hydrazine hydrate yields the biscyclohydrazide of pyromellitic dianhydride and the diamine originally used in the preparation. This reagent was, therefore, employed in a study of oxidised poly‐N,N′‐(4,4′‐diphenylether)pyromellitimide film in an attempt to elucidate the…
The, behavior of corona and the resulting damage in oil-filled insulation were investigated. internal corona should be divided into intrinsic oil corona and bubble corona. The former is far more intense than air corona. The magnitude of the individual charge usually exceeds 1 x 104 pC. Insulation damage barely appears…
Summary The crystal structure of coalingite (Mg 10 Fe 2 (OH) 24 (CO 3 )·2H 2 O) has been determined using single-crystal X-ray methods. The mineral is trigonal, with space group R m, a H = 3·12, c H = 37·4 Å, Z = ½, and (0001) cleavage. The structure is of a layer type, and is based on a structural element about 12·5…
The power dissipated by leakage currents on the surface of wet polluted insulation leads to the loss of moisture from the pollution and the formation of dry bands. The growth of the dry band depends primarily on the surface temperature and on the temperature dependence of the surface resistance. Measurements of dry-ba…
), Tl or Cs; B is Mg, Ni, Cu, Co, or Zn; and X is S or Cr. A comprehensive list of references on the crystallography of the compounds is included.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransitions and Relaxations in Poly(2,6-diphenyl 1,4-phenylene ether)Wolfgang WrasidloCite this: Macromolecules 1971, 4, 5, 642–648Publication Date (Print):September 1, 1971Publication History Published online1 May 2002Published inissue 1 September 1971https://pubs.acs.org/d…
Abstract Stability equations were derived for Belle Fourche and Aberdeen montmorillonites. Both the composition of structural ions and the cation exchange capacity (CEC) were considered to be essential features of montmorillonite stability. However, montmorillonite stability was considered to be independent of the sol…
Abstract High molecular weight poly‐N,N′‐(4,4′‐diphenylether)pyromellitimide film was prepared from pyromellitic dianhydride and 4,4′‐diaminodiphenylether and the oxidative degradation at 400°C was studied by weight loss measurements, infrared spectrometry and saponification experiments. The results indicated the rapi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEllipsometric investigations of anodic film growth on iron in neutral solution. Prepassive filmJ. O'M. Bockris, H. Wroblowa, and V. BrusicCite this: J. Phys. Chem. 1971, 75, 18, 2823–2829Publication Date (Print):September 1, 1971Publication History Published online1 May 2002…
Cotton fibers were broken under a variety of conditions and the fractures were examined in a scanning electron micro scope. Many fractures occur adjacent to the reversal zone and not through it, indicating that the reversal itself is strong, but, because of its existence in the fiber, it is a source of weakness in tha…
A synthetic medium was developed for further study of intracellular calcification by Bacterionema matruchotii. The medium contained metastable calcium phosphate, six other salts, three purines, two pyrimidines, nine vitamins, pimelic and thioctic acids, vitamin-free casein hydrolysate, and glucose. The vehicle was 0.1…
The Stoner-Wohlfarth coherent rotation model has been extended to particle sizes approaching the superparamagnetic critical size Scfor the case of barium ferrite. It is shown that at particle volumes up to100 S_{c}, the coercivity factor will be lower than the Stoner-Wohlfarth factor of 0.48. Experimentally, micro-pow…
Abstract Differential thermal analysis (DTA) of some commercial nylons has disclosed some anomalous phenomena with respect to the glass transition, generally considered to occur at 40–50°C. On the first heat cycle the transition occurs normally. On cooling, however, no corresponding transition occurs, and on an immedi…
Data concerning the types of charge carrier responsible for electrical conduction in single‐crystal aluminum oxide are reviewed, and explanations are offered for discrepancies in terms of the experimental conditions. Measurements on undoped and Co 2+ and Mg 2+ doped crystals, made using a volume guard to avoid surface…
Abstract The autoxidation of organic compounds, RH, occurs by a radical‐catalyzed chain reaction to give hydroperoxides, RO 2 H, as primary products. The initial rate is ‐d[O 2 ]/dt = k p [RH] {k i [Cat]/k t } 1/2 , or in the presence of an inhibitor, (In), k p [RH](k i [Cat]/k I [In]), where k p is the chain propagat…
1. Insoluble polymeric collagens from various human tissues were prepared by the EDTA method. Almost all of the collagen from simple soft tissues such as dermis, tendon, submucosa, sclera and cornea could be extracted, whereas the more complex tissues such as intercostal cartilage and intervertebral disc yielded only…
Abstract The dehydrochlorination of PVC under vaccum has been studied at 170–200°C by a volumetric method. The accelerating effect of HCl is related to its interaction with the forming polyene units of macromolecules. A mechanism is proposed. The effects of various stabilizers, such as organic salts of Ca, Ba, Cd, tri…