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 composite system is a system formed out of different subsystems connected by interfaces. Any physical property of such a system can be described by an operator which can have a discrete matrix form or a continuous (e.g. differential) form. Some composite systems can even be formed of partly discrete and partly conti…
Abstract The effects of silane coupling agents on styrene‐butadiene rubber (SBR)‐mica composites have been studied with special reference to the technical properties and polymer‐filler interaction. Silane‐treated mica improves polymer‐filler interaction, which subsequently enhances the tensile and other technically im…
The thermal conductivity λ of phases liquid, I, II, III and the glassy crystal state of cyclohexanol has been measured using the transient hot-wire method at temperatures in the range 100–370K and at pressures up to 0·7 GPa. It was inferred from the observed temperature dependence of the thermal resistivity W (= λ-1)…
A multicomponent order parameter for surface melting is introduced which depends both on the structure of the bulk crystal and on the orientation of the crystal surface. Each order-parameter component, $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{M}({\mathrm{Q}}^{\ensuremath{\parallel}})$, corresponds to a reciprocal-…
General occupational safety physico-chemical principles and safety flammable materials handling toxicology control measures for handling toxic substances radioactive chemicals safety with chemical engineering operations hazardous chemical processes safety in laboratories and pilot plants safety in chemical-process pla…
The dependences of the resistivity rho and the Hall voltage U H of polycrystalline Ni-Cu and Ta-Cu multi-layered thin films on the layer thickness d l are discussed. The thickness dependence of rho and U H can be well understood using a simple model in which the layers are considered as parallel resistors, whereby the…
Abstract The effect of electron beam (EB) irradiation on the mechanical and thermal properties of initially amorphous and semicrystalline poly(phenylene sulfide) (PPS) films has been investigated. Irradiations were carried out either in a nitrogen or air atmosphere. Subsequent mechanical testing carried out at 23°C su…
Strong intensity oscillations have been found in RHEED during epitaxial growth at 77 K. This temperature is too low for thermally activated diffusion and establishes that the deposited atom uses its latent heat of condensation to skip across the surface, preferentially coming to rest at growing island edges, to achiev…
By using a simple Hamiltonian of a combined crystal field and exchange field model good theoretical fits are made to the observed rare earth anisotropy constants K in a wide temperature range and the correct values of the spin reorientation temperature in R2Fe14B (R = Sm, Er, Tm, and Yb) are reproduced. The obtained c…
The stability of the transmission response of a tripole FSS as the angle of incidence is increased from 0° to 70° is compared with that for a surface using a three-dimensional version of the element, a calthrop. For TM incidence the drift in frequency of the reflection resonance is 10% for the tripole, but only 2.5% f…
A series of samples of the system Co1−xZnxFe2O4 (x = 0, 0.3, 0.4, 0.6, 0.8, and 1) are prepared by the usual ceramic technique. X-ray analysis shows that they are cubic spinel (single phase). The lattice parameter, theoretical density Dx, bulk density D, and the porosity P are measured for the samples. Thermopower and…
Emission and excitation spectra of the Mn 2+ ion in the SrS:Mn 2+ and SrS:Pb 2+ , Mn 2+ phosphor are investigated at various temperatures. The analysis of the excitation spectra of the Mn 2+ emission band leads to the Racah parameters B =712 cm -1 , C =3352 cm -1 and the crystal field parameter D q =576 cm -1 with the…
The electrical resistivity and the Hall coefficient of the layered compound ZrSe 2 and HfSe 2 grown by iodine vapour transport method have been measured. High anisotropy in electrical resistivities has been found for these compounds. The Hallmobility exhibits a temperature dependence of the form µ∝ T -1.6 in ZrSe 2 as…
An ab initio molecular-orbital study of the dissociation energy of boron monohydride of (BH) using quadratic configuration interaction and a large basis set is presented. The results suggest that the commonly accepted value for the dissociation energy Do of BH of 78.9 kcal/mol may be low by about 3– 4 kcal/mol.
A critique is given of classical models of depinning and transport by sliding charge-density waves (CDW) in quasi-one-dimensional metals. A considerable body of evidence supports a theory based on quantum tunneling over macroscopic distances, particularly on ${\mathrm{NbSe}}_{3}$ and ${\mathrm{TaS}}_{3}$. No sound pre…
Fermi-Dirac statistics have been applied to semiconducting diamond layers doped with boron by means of ion implantation. Suitable limiting equations could be derived to describe the resistance-temperature behavior which relates to acceptor activation and also to hole creation in the valence band by means of compensati…
The high-temperature sequence of phase transitions in ${\mathrm{LiKSO}}_{4}$ has been investigated by means of infrared reflectivity, Brillouin scattering, and electrical measurements. Results show the strong correlation between the lithium-ion mobility and the reorientational motion of the sulfate groups. The sulfate…
The melting curve of ice VIII near 25 kbar, which has a positive slope, has been estimated from various thermodynamic data and extrapolated approximately to 60 K at zero pressure. When ice VIII is heated from 77 K and ambient pressure it should, therefore, ‘‘melt,’’ presumably below the glass transition. It has been s…
The adhesion of human and rabbit platelets to collagens and collagen-derived fragments immobilized on plastic was investigated. Adhesion appeared to be independent of collagen conformation, since similar attachment occurred to collagen (type I) in monomeric form, as fibres or in denatured state. The adhesion of human…
Effects of the hybridization between the 4 f and valence band states on the multiplet structures in La 3 d and 4 d core X-ray photoemission spectra (XPS) are discussed for LaF 3 , LaCl 3 , and La 2 O 3 on the basis of the Anderson model considering the multiplets arising from the interaction between a 4 f electron and…