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。
Efficient metallurgical and processing development requires ability to predict the solidification microstructure of products. Models were developed to calculate possible growth morphologies and phases in order to select the most efficient one for a given solidification condition. It is then possible to predict solidif…
Sintered (Nd,Dy)-Fe-B-magnets were manufactured by adding low melting RE/sub 3/Co or RE/sub 3/Co/sub 2/ alloys (RE=Nd or/and Dy) to basic alloys with compositions close to the Nd/sub 2/Fe/sub 14/B stoichiometry. The remanent polarizations and the coercivities of sintered and annealed magnets with about 2 wt.% Dy range…
d-Electron stabilisation energies provide a general framework for extending conventional Molecular Mechanics to open-shell complexes; a single set of Force Field parameters successfully models both planar CuN4 and Jahn–Teller distorted, tetragonally elongated CuN6 amine complexes.
Reduction of siliceous manganese ore containing 41.0 wt%Mn and 11.0 wt%SiO2 by graphite has been studied by the measurement of weight loss in argon atmosphere at 900, 1200 and 1400°C and following by X-ray diffraction and Microprobe analyses. The ore was sized to –150+53 μm and preliminary calcined at 1000°C in argon…
Abstract The oxidation of phase pure ZnS in the wurtzite and sphalerite modification upon heating in an air flow has been studied by simultaneous thermogravimetry‐differential thermal analysis and in‐situ X‐ray diffraction at high temperature (high temperature camera and electron synchrotron). The oxidation of wurtzit…
The integral expressions of the derivatives of the small-angle scattering correlation function are obtained in terms of the parametric equations of the interphase surfaces. For each derivative, its integral expression is the surface average of a loop integral of a vectorial field that is the only quantity depending on…
The surfaces of polymers, namely polypropylene, copolymers and blends, were exposed to low pressure oxygen and atmospheric pressure air plasmas to improve their adhesion to polyurethane adhesives. A correlation is attempted between lap shear strengths of polypropylene-polyurethane composites and the relevant XPS, AFM…
Dynamic tensile tests and instrumented impact tests with Charpy-V-notch specimens and precracked Charpy specimens (SENB) are performed and simulated. Two strain-rate dependent micromechanical models based on the modified Gurson flow function are compared by simulating different dynamically loaded specimens. One purpos…
A direct torque control system for a variable speed induction motor drive consists of two hysteresis comparators, a selection table, a flux and torque estimator, and a PID speed controller. With this control structure, the drive performance can be significantly improved when compared to field oriented control. In the…
The effect of thermal treatment on the behavior of the transition of an Fe-50.5 at%Rh alloy between the anti-ferromagnetic and ferromagnetic phase was carefully investigated with electric resistivity measurements and transmission electron microscopy (TEM).The specimens were annealed near 1000 K after solution treatmen…
High-strength ceramic molds with heat resistance and oxidation resistance have been fabricated, and they are now applied to practical parts such as turbo rotors, bearings and machining tools. However, their fracture toughness and thermal shock resistance are poor and their reliability is also low. In order to improve…
Atmospheric refiner mechanical pulping of untreated, fungal and alkali treated jute bast has been explored in the present investigation. Hammermilled and cut jute bast strands were refined in a laboratory single disc refiner under atmospheric conditions. First stage refining was carried out to about 500 ml. CSF and se…
Abstract Chiral symmetry breaking can be realized in stirred crystallization of Na‐ClO 3 . We present experimental and theoretical studies of the random distribution of crystal enantiomeric excess (cee) for various stirring and solvent evaporation rates. For a fixed solvent evaporation rate, as the stirring RPM is inc…
The reactions of pyrrole and thiophene monomers in copper-exchanged mordenite have been investigated using EPR and UV–VIS absorption spectroscopy. The EPR spectra show a decrease in the intensity of the Cu2+ signal and the appearance of a radical signal due to the formation of oxidatively coupled oligomeric and/or pol…
β‐SiC powder containing 6 wt% A1 2 O 3 and 4 wt% Y 2 O 3 as sintering additives was pressureless sintered at 2000°C for 1 h (AYE‐SiC) and 3 h (AYP‐SiC). AYE‐SiC consisted of an equiaxed grain structure and AYP‐SiC exhibited a micro‐structure with platelike grains as a result of grain growth related to β→α phase transf…
A desire for improvement of the state of the art in cotton quality measurements, and for application of such measurements to the ginning process, has prompted investigation of near-infrared reflectance (NIR) as a means of measuring different cotton quality characteristics. Cotton samples from five different cotton sou…
The luminescence emission from the complexes between EuIII and tetracyclines was found to be greatly enhanced by surfactants. Under optimum conditions, viz., pH 8.0 and 1.0% m/v cetylpyridinium chloride or Triton X-100 surfactant, an enhancement by a factor of up to approximately 34 was observed for some tetracyclines…
A rigorous theory of the difference frequency mixing of two signals, one with frequency ω and the other with frequency near 2ω, in semiconductors is presented. It is shown that a lower-frequency (DC ~ 10THz) directional photocurrent and voltage are generated as a result of this nonlinear interaction. This result concl…
Illumination of solutions of spiroquinoxazine 1 yields both a coloured species and a fluorescent species, both of which are reverse photochromic and both of which are trapped by bivalent metal ion complexation.
It is recognized that the non-dispersive components, γab, of the surface free energies, γ, play an important role in the interactions of a polymer with other substrates. Because of the difficulty in measuring the surface free energy of a solid polymer surface, many methods to estimate γ have been developed. The purpos…