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。
An attempt is made to characterize the compression properties of fibre masses in terms of two independent parameters,κY and ρ0 derived from van Wyk's theory of fibrous compression. For the wide range of wool samples examined, the compression characteristics are dominated by the κY parameter, the ρ0 parameter having li…
A previous theory of thickening has been extended to encompass the possible dependence of cooperative chain transport on lamella thickness and crystallinity changes during annealing. These have marked effects on the thickening rate leading to changes in slope and departures from straight-line behavior of the plots of…
Abstract Glass formation was investigated in the Na2O–TiO2–P2O5, K2O–TiO2–P2O5, BaO–TiO2–P2O5,Na2O–BaO–P2O5, and Na2O–BaO–TiO2–P2O5 systems. In the Na2O–TiO2–P2O5 system, glass containing up to 45.5 mol% TiO2 was found to be formed at the composition of Na2O/P2O5=1, whereas in the K2O–TiO2–P2O5 system the glass format…
We report on three techniques for replicating relief patterns in dielectric materials for use as substrates for planar integrated optical circuits: embossing with a metal die; casting from a metal die; and casting from a rubber mold. Techniques for overcoating the substrates with light-guiding films and filling of gro…
The relation ΔCpΔκ = TV(Δα)2 is shown to be obeyed under the same assumptions that Davies and Jones used to derive the weaker condition ΔCpΔκ ≥ TV(Δα)2. This means that if a material is found experimentally not to obey the above equality, then it is not describable by an order-parameter theory. A prescription is given…
Abstract Samples of low‐density polyethylene, free from additives, were kept at temperatures between 284° and 355°C under nitrogen containing 1.16% oxygen or less. Changes in molecular weight distribution (MWD) and degree of long‐chain branching (LCB) were followed by gel chromatography (GPC) and viscosity measurement…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitroxides. LII. Synthesis and electron spin resonance studies of N,N'-dioxy-2,6-diazaadamantane, a symmetrical ground state tripletRose M. Dupeyre, Andre Rassat, and Jacques RonzaudCite this: J. Am. Chem. Soc. 1974, 96, 21, 6559–6568Publication Date (Print):October 1, 1974P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerrous porphyrins in organic solvents. I. Preparation and coordinating propertiesDaniel Brault and Michel RougeeCite this: Biochemistry 1974, 13, 22, 4591–4597Publication Date (Print):October 1, 1974Publication History Published online1 May 2002Published inissue 1 October 1…
Galvanic interaction between the Al alloys 1100, 2024, 2219, 6061, 7075, and Ag, Cu, Ni, Sn, Cd, Zn, the stainless steels 301, 304L, 347, A286, PH13-8Mo, Steel 4130, Inconel 718, Haynes 188 and Ti-6Al-4V has been studied in air saturated 3.5% NaCl by weight loss measurements and continuous monitoring of the galvanic c…
The fracture energies and spalling resistance of high‐Al 2 O 3 refractories were studied. The fracture energies, γ WOF and γ NBT , were measured by the work‐of‐fracture and the notched‐beam‐test methods, respectively. Spalling resistance, as measured by the relative strength retained in a water quench, correlated well…
We have measured the optical Kerr effect and the intensity-dependent ellipse rotation in order to study the pretransitional behavior of field-induced molecular alignment in the isotropic nematic substances $p$-methoxy-benzylidene $p\ensuremath{-}n$-butylaniline (MBBA) and $p$-ethoxy-benzylidene-$p$-butylaniline (EBBA)…
Small-angle X-ray scattering and transmission electron microscopy experiments have been performed on high-purity (99·9999+ %) aluminium single crystals that were neutron-irradiated to a fluenoe of 1·5 × 1021 n/cm2 (>0·18MeV) at 50°C. The volume changes determined by each technique are in reasonably good agreement. Evi…
grams using these methods have been successfully applied in over fifteen cases. No further work is planned. The data are available on request from the authors. Statistical data are listed in Table
Article A redetermination of the crystal structure of cosalite, Pb2Bi2S5 was published on November 1, 1974 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 140, issue 1-2).
The superposition of several periodic or quasiperiodic patterns produces moiré effects. In particular, the combination of three grid structures adds great flexibility to the use of moiré phenomena. Information about the fringe structure, given by vector addition in Fourier space, allows investigation of formations, in…
Transformation‐range viscosities are reported for Na 2 O‐, K 2 O‐, Rb 2 O‐, and Cs 2 O‐GeO 2 glasses. A minimum in viscosity occurs between 1 and 5 mol% alkali oxide and a maximum between 17 and 22 mol% alkali oxide. The thermal‐expansion coefficients of the Na 2 O‐GeO 2 glasses also exhibit a minimum at < 5 mol% N…
The (100) and (101) interplanar spacings of 400 mesh quartz powder were measured by high-temperature X-ray diffractometry from 22 to 1400°C. Expansion through the high-low transformation was reversible and continuous, with evidence of 1–2° hysteresis; expansion from 574 to 1000° is zero, with a net decrease from 1000…
Abstract Photoelectron spectra were measured in the region between 6 and 21 eV for aniline, N,N-dimethylaniline, phenol, anisole, benzonitrile, acetophenone, nitrobenzene, and their methyl derivatives. The observed spectra were interpreted in terms of their MO’s obtained by the CNDO/2 and EHMO methods, the methyl-subs…
The three dimensional structure of the lysozyme from bacteriophage T4 has been determined from a 2.5 A resolution electron density map. About 60% of the molecule is in a helical conformation and there is one region consisting of antiparallel beta-structure. The polypeptide backbone folds into two distinct lobes linked…
Abstract This is a study of materials which are positive‐temperature‐coefficient resistors. Such materials, composed of conductive particles dispersed in a crystalline polymeric matrix, have been found to be of limited stability. An example is carbon black in high‐density polyethylene. On repeated cycling through the…