New Designs for Very High Spin Hydrocarbons
Several new structures are proposed as tests of a general model for the design of ferromagnetic polymers.
Materials Literature
文献浏览
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。
The calcium binding capacity of polycarboxylates
Abstract It can be shown both theoretically and experimentally that calcium carbonate forms during the titration of polycarboxylates by calcium with carbonate as the indicator, and that the calcium carbonate is dispersed by the polycarboxylate. If the dispersing capacity of the polymer exceeds the level of calcium car…
Li7O2Br3 — Eine weitere Strukturvariante der neuen Alkalimetallchalkogenidhalogenid-Perowskite / Li7O2Br3 — A Further Structure Variant of the New Alkali Metal Chalcogenide Halide Perovskites
The colourless compounds Li 3 OBr and Li 7 O 2 Br 3 have been prepared and characterized by X-ray diffraction techniques. Li 3 OBr crystallizes in a cubic primitive lattice (Pm3m) with a = 405.6(1) pm (Z = 1). The structure is related to the anti-perovskite type. Li 7 O 2 Br 3 crystallizes in a tetragonal bodycentered…
AN EXPERIMENTAL STUDY OF SOLIDIFICATION OF BINARY MIXTURES WITH DOUBLE-DIFFUSIVE CONVECTION IN THE LIQUID
An experimental study is reported of solidification of ammonium chloride-water solutions inside a rectangular enclosure. The phase-change and convection processes are studied through shadowgraph and flow visualization as well as temperature and concentration measurements. A number of different initial and boundary con…
The optical properties of a polyetherimide
Abstract The optical properties of polyetherimide resin as described by the complex index of refraction, N = n ‐ ik, are derived by Kramers‐Kronig analysis of experimental absorption and reflectance data obtained in the range 40 μm ≥ λ ≥105 nm. Potential uses of this polymer as a printed circuit board material and as…
The influence of ion scattering on dry etch profiles
A simulation study is presented using a new version of the simulation program ADEPT (advanced simulation of dry-etching process technology), which is a subset of the process simulator COMPOSITE. Based on some aspects of plasma physics, a model was developed that allows for the calculation of important properties of a…
Electrochromic properties of rf-sputtered tungstic oxide film prepared from a W metal target
Tungstic oxide film is prepared from a W metal target by the rf sputtering method and its electrochromic characteristics are compared with that from WO3 target. Maximum coloration efficiency found for both kinds of films are equal and about 0.06 cm2 /mC at the wavelength of 600 nm, which is higher than that of typical…
Structural, spectroscopic and theoretical studies of novel d6 fac-bromotricarbonyl(dithiooxamide)rhenium complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural, spectroscopic and theoretical studies of novel d6 fac-bromotricarbonyl(dithiooxamide)rhenium complexesPeter C. Servaas, Derk J. Stufkens, Ad Oskam, Pieter Vernooijs, Evert Jan Baerends, Dirk J. A. De Ridder, and Caspar H. StamCite this: Inorg. Chem. 1989, 28, 22,…
Resonance Raman studies on tetradesmethyl‐β‐carotene aggregates
Abstract Tetradesmethyl‐β‐carotene is found to form aggregates in a mixed solvent of methylcyclohexane and isopentane at temperatures below 180 K. The absorption band around 470 nm (0–0 transition) of the monomer splits into a pair of absorptions (exciton bands) on aggregation, one around 400 nm and the other around 5…
Arsenic Deposition onto a Gold Substrate
Arsenic deposition onto a gold substrate was studied as a function of p H, deposition potential, and time. Deposition of less than three monolayers was observed. The rate of deposition decreased as the thickness of the deposit increased. A set of partial reactions leading to arsenic deposition was proposed. The kineti…
A Model to Estimate the Breaking Elongation of High Twist Ring Spun Cotton Yarns
A mathematical model has been evolved to estimate the breaking elongation of highly twisted (3 < TM < 6) singles ring spun cotton yams from fiber characteristics. Results show that the accuracy of estimation of the proposed model is very high. The model is applicable to both carded and combed cottons.
Carbon Dioxide Corrosion of L-80 Grade Tubular in Flowing Oil-Brine Two-Phase Environments
The sweet corrosion behavior of L-80 grade downhole tubular was investigated in flowing two-phase oil-brine fluids. Depending upon percent water cut, two different phases appeared to exist: a water-continuous phase above 50% water cut and an oil-continuous phase below 50% water cut. In the oil-continuous phase, the pr…
Electrical properties of PbTiO 3 single crystals doped with lanthanum
Results of electric conductivity, permittivity and spontaneous polarization measurements for PbTiO3 single crystals with La doping up to 0.44 at % are presented. Marked influence of lanthanum doping on dielectric parameters such as permittivity and Curie temperature has been found. Considerable changes of d.c. conduct…
Fluorescence studies of polymer adsorption. 3. Adsorption of pyrene-end-labeled poly(ethylene glycol) on colloidal polystyrene particles
The adsorption of pyrene-end-labeled poly(ethy1ene glycol) (Py-PEG-Py) onto aqueous colloidal polystyrene (PS) particles is investigated by photostationary fluorescence, fluorescence decay, and photostationary fluorescence depolarization experiments. All of the spectroscopic observations on this system suggest the ass…
On the transition-metal quasisublattice in icosahedral Al-Cr-Fe phases
The formation of the icosahedral quasicrystalline phase in the Al-Cr-Fe system has been investigated by X-ray diffraction as a function of the CrxFe1–x, composition of the transition-metal (TM) quasisublattice. An optimal range was found around x = 0·6, where the icosahedral phase shows the highest degree of structura…
High-resolution low-voltage electron optical system for very large specimens
This article introduces an unconventional electron optical probe forming system which is particularly suitable for low beam voltages and very large specimens, such as semiconductor wafers which also require a large angle tilting. The system can produce an electron probe of less than 20 Å for a nontilting specimen at 1…
Polymorphism of POP and SOS III. Solvent crystallization of β 2 and β 1 polymorphs
Abstract Single crystals of β 1 and polycrystals of β 2 of POP and SOS were obtained from acetonitrile solution. The crystallization behavior of the two polymorphs was almost the same in POP and SOS; rapid cooling of the solution preferentially crystallized the metastable β 2 form, and the most stable β 1 form crystal…
Ferroelectric nematic liquid-crystal phases of dipolar hard ellipsoids
A search for ferroelectric nematic liquid crystals is carried out on the basis of a simple theoretical model viewing the nonspherical polar molecules as hard ellipsoids of revolution with an embedded permanent dipole oriented along the symmetry axis. The density-dipole moment-aspect ratio phase diagram of the dipolar…
Effects of yttria concentration on the EPR signal in x-ray-irradiated yttria-stabilized zirconia
The anisotropic EPR signal already observed in x-ray-irradiated yttria-stabilized zirconia is analyzed between 140 and 300 K in samples containing 12% and 24% ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$. A temperature-dependent broadening is detected and attributed to spin-lattice interactions whose mechanisms are discussed.…
Frank elastic constants of a nematic liquid crystal of hard molecules
We present a theoretical calculation of the Frank elastic constants of a nematic liquid crystal made of hard spherocylinders. We use the existing relations for these elastic constants together with the direct correlation function which we obtain consistently from a free-energy density-functional approximation recently…