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。
Deuterium magnetic-resonance studies of spectral patterns from spinning samples are made to measure the relative contribution of various orientational order mechanisms to the biaxiality of the hydrocarbon chain in the smectic $C$ phase. The detailed theory of motional averaging as applied to the spinning techniques is…
Abstract The different types of morphology that can be developed in a large number of low‐density (branched) polyethylene whole polymers, as well as in a series of fractions, have been studied for two different extreme crystallization modes. Concomitantly, thermodynamic properties of the same samples have also been de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the metamagnetic 1:1 1-D phase of the decamethylferrocenium 7,7,8,8-tetracyano-p-quinodimethanide: Fe[C5(CH3)5]2+.cntdot.(TCNQ)-.cntdot.Joel S. Miller, Arthur H. Reis Jr., E. Gebert, J. J. Ritsko, W. R. Salaneck, L. Kovnat, Thomas W. Cape, a…
International audience
Abstract Secondary nucleation kinetics for potash alum in draft‐tube baffled crystallizers have been determined from steady state crystal size distributions measured down to about 5 μm. Differences in nucleation rates were found for crystallizers of similar geometry but different capacity. Models relating the frequenc…
Abstract The thermal transition behavior of a series of hydroxy terminated polybutadiene (HTPBD) containing segmented polyurethanes has been studied by differential scanning calorimetry (DSC) and thermal mechanical analysis (TMA). Four transition regions are observed; the soft segment T g , at −74°C, two hard segment…
In this paper we study theoretically and experimentally the transport of electrons in Teflon FEP type A under isothermal conditions (145 °C) in open circuit. We suggest a theoretical model including surface, shallow, and deep traps. The model leads to a system of partial differential equations which was solved numeric…
Abstract The modules and birefringence of oriented polymers are known to couple through the structural and intrinsic properties of the polymer. Recent developments in both optical and mechanical theories have allowed this coupling to be expanded so that it includes predictions of modulus and refractive indices of unia…
The misorientation dependence of grain boundary sliding and effects of grain boundary structure and crystal deformation on sliding have been studied by experiments using 〈1010〉 tilt zinc bicrystals with different misorientations. The results have shown that grain boundary sliding strongly depends on the misorientation…
High-resolution electron-microscope images in conjunction with selected-area electron diffraction were used to investigate the short-range order in PbMg1/3Nb2/3O3. Intensity fluctuations of the [110] image indicated ordered domains extending over about 20 to 50 Å. Decomposition phases were observed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical properties and electronic interactions of microcrystalline copper/zinc oxide (Cu/ZnO) catalystsJohn B. Bulko, Richard G. Herman, Kamil. Klier, and Gary W. SimmonsCite this: J. Phys. Chem. 1979, 83, 24, 3118–3122Publication Date (Print):November 1, 1979Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-supported metal cluster carbonyls. Chemisorption decomposition and reactivity of hexadecacarbonylhexarhodium supported on alumina, silica-alumina, and magnesiaA. K. Smith, F. Hugues, A. Theolier, J. M. Basset, R. Ugo, G. M. Zanderighi, J. L. Bilhou, and W. F. Graydon…
The optical-absorption spectrum of ${\mathrm{Tm}}^{3+}$ in TmCr${\mathrm{O}}_{3}$ single crystals in the spectral range 6000-8100 \AA{} is reported as a function of photon polarization and temperature from 3.4 to 77.3 K. Singlet states of the ${\mathrm{Tm}}^{3+}$ ground multiplet $^{3}H_{6}$ are found at 17.7, 41.3, 7…
Magnetically uniaxial amorphous Co79Fe6.5B14.5 films 1.5 μm in thickness were deposited by r.f. bias sputtering from a Co74Fe6B20 target onto glass and single crystal Si substrates. The saturation magnetostriction, λs, changed gradually from +0.6×10−6 to −0.4×10−6 when the d.c. bias voltage was increased from 0 to −12…
Any cubic crystal structure can be divided into small units in the form of congruent semi-regular (Archimedean) truncated octahedra. The centers of these polyhedra can be chosen at invariant equivalent positions for most cubic space groups. The part of a crystal structure enclosed by an Archimedean polyhedron is calle…
Ferrite devices for millimeter frequencies, 35 GHz to 94 GHz, are difficult to fabricate and have marginal performance. This paper discusses the design and arc plasma fabrication process for non-reciprocal ferrite phase shifters for millimeter frequencies. Design and fabrication techniques were developed for 35 GHz, p…
Abstract The compatibility and mechanical properties of poly(vinyl chloride) (PVC) and thermoplastic polyurethane (PU) are described in this paper. The compatibility has been estimated using a variety of methods including the measurements of viscosity of polymer solutions, comparison of solubility parameters of PVC an…
This paper reports on the application of the concept of effective permeability using the finite element technique, to the solution of eddy current problems, and the determination of damping resistances as well as the characteristics of the solid iron rotors in rotating machinery during transients. The formulation is b…
Mn1-x-yAlxCyforms for0.42 \leq x \leq 0.47and0 \leq Y \leq 0.021a metastable tetragonal τ-phase which is ferromagnetic. Its unaxial magnetic anisotropy makes it an interesting candidate for permanent magnetic applications. The metastable τ-phase is produced from the high temperature equilibrium ε-phase in two steps; a…
The determination of the glass-transition pressure by the ruby R1 line-broadening method is quantitatively confirmed to within 10% by an independent method. The procedure utilizes a model which describes the pressure dependence of the viscosity and contains the glass-transition pressure as a parameter. The two methods…