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。
Les principales configurations des défauts curvilignes des phases smectiques C sont décrites en se référant à deux classifications : celle basée sur le processus de Volterra et celle définie par les classes d'équivalence du premier groupe d'homotopie de la variété des états internes du milieu ordonné. On compare ces d…
The biocompatibility and biodegradability of periodate oxidized cellulose is assessed in vivo. Morophological and histopathological studies over a period of six months indicate that oxidized cellulose degrades slowly without producing excessive tissue reaction. Preliminary investigations on the kinetics of degradation…
The scattering of a two-dimensional Gaussian beam wave by a perfectly conducting or dielectric cylinder centered off both the beam axis and the beam waist is treated by the Fourier-series-expansion method. The incident-beam fields are expanded in a Fourier series with respect to the polar angle in a cylindrical coordi…
A series of hydrogen bonded complexes of pentachlorophenol with various N bases, covering a wide range of ΔpKa values, was investigated using 35Cl n.q.r. The average frequencies of 35Cl n.q.r. of these complexes were compared with those of pentachlorophenol, tetrabutylammonium pentachlorophenolate and tetrabutylammoni…
X-Ray structure determination of K8[Mo36O112(H2O)16]·36H2O which crystallises from medium-acidified aqueous molybdate solutions (mole ratio added [H+]: added [MoO42–], ca. 1·8–2·0) shows that the largest isopolyanion known to date reflects the conditions of its formation and contains structural features typical of bot…
In the μ-carbido complex (4), obtained as shown below, the tin atom is linked to the rhenium atoms via a carbide carbon atom which bonds like a carbyne to the rhenium (TPP stands for tetraphenylporphyrin). An impression of the spatial arrangement of the complexes of type (3), which are formed at only slightly higher t…
Abstract FeNbO 4 wird in zwei Modifikationen ((A) Wolframit‐ und (B) AlNbO 4 ‐Typ) in einkristalliner Form dargestellt. Röntgenographische Untersuchungen von (A) und (B) ergaben: (A) a = 499,2, b = 560,7, c = 463,7 pm, β = 90,06°; Raumgruppe C P2/a. (B) a = 1230,8, b = 377,1, c = 656,9 pm, β = 107,6°; Raumgruppe C C…
The pretransitional behaviour of 12CB which exhibits a direct isotropic to smectic A phase transition has been studied by light scattering as a function of temperature in the isotropic phase. This behaviour has been examined in terms of the Landau - de Gennes model and compared with that observed for the direct isotro…
We study the stability of a Poiseuille flow in a planar nematic. We extend the analysis given in ref. [5] to take into account periodic distortions of the director. Several different approaches are employed : simplified models, Galerkin method, or numerical simulation. Our results allow one to interpret experimental f…
The room-temperature crystal structure as well as low-temperature magnetic studies which include heat-capacity, proton-resonance, and magnetic-susceptibility experiments are reported for Mn${(\mathrm{SCN})}_{2}$${({\mathrm{C}}_{2}{\mathrm{H}}_{5}\mathrm{O}\mathrm{H})}_{2}$. The compound belongs to the space group $\fr…
Under the condition postulated for a loss-of-coolant accident (LOCA), Zircaloy-4 fuel cladding may experience a temperature transient during which it absorbs an appreciable amount of oxygen from the coolant. Theoretical models for predicting cladding behavior during loss-of-coolant (LOC) are being developed, but until…
Electrical conductivity and the ionic and electronic transference numbers were determined for two types of unintentionally doped single crystalline sapphire for current directions perpendicular to the r plane (1102). One was acceptor dominated and the other was initially donor (H i x ) dominated, changing to acceptor…
The microstructure of the built-up edges of a number of alloys has been examined using both optical and electron microscopy. The built-up edges of the two ferrific steels examined showed that these were significantly different to those formed in austenitic stainless steel and Cu–40Zn brass. The built-up edge deformati…
Typical Bs type phase solubility diagrams were obtained for α-and β-cyclodextrins (α-CyD and β-CyD) with methyl cinnamate, ethyl cinnamate, and cinnamaldehyde in water at 25°. Solid complexes for α-and β-CyDs with three guest molecules were obtained and their molar ratios were found to be 2 : 1 (α-CyD/guest molecule)…
The existence of compounds between Si 3 N 4 ‐CeO 2 and Si 3 N 4 ‐Ce 2 O 3 was investigated for firing temperatures of 1600° to 1700°C. The two new monoclinic compounds found were Ce 2 O 3 ·2Si 3 N 4 with lattice parameters a = 16.288, b = 4.848, and c =7.853 Å and β=91.54° and Ce 4 Si 2 O 7 N 2 with lattice parameters…
Abstract A static platelet adhesion test using whole human blood was employed to assess the affinity of various bare polymer (sulfonated polystyrene, acetal resin, Teflon FEP, polystyrene) surfaces as well as various surfaces of glass and polymers that were coated with plasma proteins. Platelet adhesion to the bare po…
In this paper, an evaluation of the methods of finite elements and finite differences, as applied to nonlinear magnetic field problems in electrical machines, is presented. The evaluation covers the aspects of effectiveness, numerical accuracy, modeling implementation considerations as well as computer storage and exe…
The phase relations in the system HfO 2 ‐Sm 2 O 3 were studied by high‐temperature and room‐temperature X‐ray diffraction. The areas of existence of the solid solutions based on HfO 2 , Sm 2 Hf 2 O 7 , and Sm 2 O 3 were determined using the lattice parameter method. Also, the influence of small additions of Sm 2 O 3 o…
Emission and excitation spectra for Ce 3+ in CaS have been observed at 75 K. They exhibit sharp phonon replicas due to pseudolocalized lattice vibrations. The observed frequencies of the pseudolocalized vibrations are 293 and 209 cm -1 in the emission spectra, and 282 and 206 cm -1 in the excitation spectra. Peak posi…
Abstract Graft polymerizations of vinyl acetate onto granular corn starch were initiated by cobalt‐60 irradiation of starch‐monomer‐water mixtures, and ungrafted poly(vinylacetate) was separated from the graft copolymer by benzene extraction. Conversions of monomer to polymer were quantitative at a radiation dose of 1…