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。
For pt.I see ibid., vol.13, no.10, p.1901 (1980). A molecular dynamics study of fast-ion conduction in SrCl 2 is continued. The average distributions of cations and anions in the unit cell at temperatures just below, and several hundred degrees above, the simulated transition temperature are compared. Even in the high…
The results of ENDOR investigations of magnetically dilute single crystals of Ag(II) and Cu(II) tetraphenylporphyrins (TPP) are presented and discussed. The complete hyperfine tensors, and quadrupole tensor for nitrogen, have been determined for the metal ions, nitrogens and pyrrole protons. The non-first order 14N EN…
The temperature dependence of structural and magnetic order parameters of ferroelectric-antiferromagnetic BiFeO 3 with rhombohedral perovskite structure is investigated by means of neutron diffraction on a powder sample. The tilt angle of oxygen octahedra decreases from 12.5 degrees at 4.2K to 11.4 degrees at 878K. As…
Temperature dependence of the Raman spectrum of AgNa(NO 2 ) 2 has been studied. At low temperatures, the ν 2 -spectrum due to the bending vibration of the NO - 2 ions in the crystal consists of two components at 832 and 858 cm -1 . With increasing temperature, the third component becomes appreciable at 845 cm -1 near…
Loeb retracted his support for Hermstein's negative ions cloud theory and proposed that the reduction of electric field at the anode, due to the presence of positive ions space charge, could be responsible for the corona-stabilization in electronegative gases. Based on this comment, Abdel-Salam et al. proposed a semi-…
A novel method is presented for correcting the defocusing and aberrations by means of the eight-pole stigmator, compensating both astigmatism and coma aberrations by second and third order astigmatisms in addition to the dynamic focusing. Owing to the electronic feedback circuit compensating the defocus and deflection…
The crystal structures of Sb 2 Tl 7 , Cu 5 Zn 8 , and Ir 3 Ge 7 are discussed with the aid of shortest distances of Dirichlet domains and of voids in their frameworks. It will be pointed out that all three frameworks must be regarded as different though relations between the atomic parameters are obvious. The Sb 2 Tl…
It was experimentally demonstrated that high power irradiation of ions on metal surfaces is possible by using a `Plasma Anode' for electron beam generation. The irradiation power of 600 keV protons was 50 MW·cm -2 which is comparable with the pulse power loading of a CTR tokamak first wall at a strong major disruption…
The use of differential scanning calorimetry for examining the thermal behaviour of thermoplastics is described. Applications which are discussed include the measurement of specific heat, glass transition phenomena, melting and crystallization characteristics and thermal stability. The value of the results is demonstr…
Abstract In order to confirm the presence of a transition at the temperature where the liquid crystal-isotropic liquid transition curve in the nematogen-rich region is met by the other transition curve, five binary systems comprising azoxydianisole (AA) and a Schiff base were examined by means of differential scanning…
Abstract The influence of morphology in a low density, high melt index polyethylene was studied with particular reference to environmental stress cracking (ESC). Test samples of the polyethylene were molded under constant conditions, only the subsequent rate of cooling to room temperature being changed. Several techni…
This work is a continuation of our former investigations in the field of corrosion of steel by alternating currents. In-vestigations of corrosion of construction ship steels by alternating currents in seawater have been made. Investigations were performed within the range of alternating current densities from 20 up to…
A niobium tungsten bronze crystal with a nominal composition 3 Nb2O5.8WO3 gives circular diffuse scattering in the electron diffraction pattern. The diffuse rings change shape and size when the crystal is reduced at high temperature. The observations are explained by improving the cluster model proposed by De Ridder,…
Abstract A technique is presented for the direct study of water attack at the silane‐filler interface. This technique, Filler Desorption Test (FDT), involves observations of surface tension changes which occur when a silane‐treated filler is floated on a water surface. If all the silane has been appropriately cured to…
Abstract The role of aqueous alkali solutions as swelling agents of cotton cellulose has been studied by various workers and these reagents have been invariably considered to cause lattice disorder in cellulose. The effect of multiple swelling treatments on the cotton cellulose structure has not been studied hitherto.…
The order-disorder ferroelectric transition in HCl and in the mixed crystals HCl-DCl has been studied by means of $^{35}\mathrm{Cl}$ ($I=\frac{3}{2}$) nuclear quadrupole resonance (NQR) pulse Fourier transform measurements. The NQR parameters are related to the static and dynamical quantities involved in the transitio…
Young's modulus and the Delta E effect of Fe-Pd Invar alloys have been investigated. The Delta E effect at room temperature exhibited a similar concentration dependence of the longitudinal linear magnetostriction. The temperature dependence of Young's modulus was analogous to that of Fe-Ni and Fe-Pt Invar alloys, name…
The title compound crystallizes in the orthorhombic system (possible space groups: C2cm, Cmcm and Cmc21). The unit-cell data are a = 6.313 (5), b = 16.60 (2), c =7.555 (3) Å. The indexed powder data is given.
Selected area electron diffraction and transmission electron microscopy have been used to characterize the pre-neck deformation mechanisms which operate with increasing strain throughout the volume of ‘two-dimensional’ melt-cast high-density polyethylene spherulites. Comparisons are made between the results and previo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the Gas-Phase Catalytic Isomerization of XylenesAvelino Corma and Antonio CortésCite this: Ind. Eng. Chem. Process Des. Dev. 1980, 19, 2, 263–267Publication Date (Print):April 1, 1980Publication History Published online1 May 2002Published inissue 1 April 1980http…