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 chemoinfometric method for the quantitative determination of the crystal content of indomethacin (IMC) polymorphs, based on Fourier-transform near-infrared (FT-NIR) spectroscopy, was established. A direct comparison of the data with those collected using the conventional powder X-ray diffraction method was performed…
This study investigates the thermal stability of poly(p-phenylenediamine-terephtalamide) (PPT) and poly(p-phenylenebenzobisoxazole) (PBO) fibres. Excellent behaviour of PBO is shown in comparison to that of PPT. The thermal stability (under pyrolytic or thermo-oxidative conditions) of PBO is 150 °C higher than that of…
The ability to utilize formamide as a sole nitrogen source has been found in numerous fungi. We have cloned the fmdS gene encoding a formamidase from Aspergillus nidulans and found that it belongs to a highly conserved family of proteins separate from the major amidase families. The expression of fmdS is primarily reg…
A detailed X-ray line broadening study in a ball-milled Ti sample is presented. It has been observed that ball milling leads to the formation of nanocrystalline grains and transforms partially to a fcc Ti phase after milling for 10 h. Milled samples show an inhomogeneous strain which increases with increasing milling…
Brannerite, UTi 2 O 6 , can be formed only under low oxygen pressures by dry ceramic processing techniques, but the substitution of ∼0.2 and 0.3 formula units (fu) of Ca or Gd, respectively, for U allows the stabilization of the phase in air. The Ca/Gd in brannerite provides charge compensation for some U to exist in…
Electron beam-initiated crosslinking of films prepared from a blend of low-density polyethylene (LDPE) and ethylene–vinyl acetate (EVA) containing 45% vinyl acetate, with ditrimethylol propane tetraacrylate (DTMPTA), was carried out over a range of radiation doses (20–500 kGy), concentration of DTMPTA (1–5 parts by we…
The preparation of macro–micro bifunctional porous materials has been accomplished by a well-controlled, vacuum-assisted technique. Monodisperse polystyrene latex spheres were ordered into close-packed arrays by slow sedimentation, allowing a high flux of water through the interstices between latex spheres. Zeolite LT…
Performance of a single-chamber solid oxide fuel cell was evaluated using a 0.15 mm thick Sm-doped ceria (SDC) electrolyte together with a 30 wt % SDC-Ni anode and a cathode at heating temperatures below 500°C in a flowing mixture of butane and air. A large quantity of reaction heat, which was evolved by the partial o…
A water-soluble peroxititanic complex [Ti(OH)3O2]− was prepared through the reaction between titanium metal and hydrogen peroxide at pH = 11. A solution of lead nitrate and zirconyl nitrate was added to the peroxititanic acid solution, and a stoichiometric and amorphous precipitate of a mixed oxide of lead, zirconium…
The molecular and basically isostructural oxo-alkoxides Ln5O(OPri)13 (Pri = 2-propyl) with Ln = Nd (1) and Gd (2) were synthesized by metathesis of LnCl3 and KOPri, in combination with stoichiometric hydrolysis, in 2-propanol-containing solvents. Er5O(OPri)133 was obtained as co-product to an erbium aluminium 2-propox…
tension ^ temperature relationships for copper and nickel samples prepared by cold crucible melting to 3%, by the levitation and sessile drop methods, and values were also obtained for iron and gold in preliminary studies. For copper, …g = Nm �1) ˆ 1:304 � 0:289 10 �3 [(y � 1083)=8C]; for nickel, …g = Nm �1) ˆ 1:781 �…
This paper discusses the drying processes of four different designs of household clothes tumbler dryer using electric power input. The relative advantages and disadvantages and the energy analyses of the dryers are presented. A parametric study was conducted to assess the effects of different variables on energy effic…
A coupled stochastic model has been developed for the prediction of solidification grain structures in centrifugal casting. The present model consists of two schemes: the cellular automaton to simulate the evolution of solidification structure and the finite volume method to calculate the heat transfer. The present mo…
Water-swellable rubbers were prepared by dispersing the superabsorbent polymer particles, sodium polyacrylate particles, in natural rubber, and their water absorption properties were investigated. Sodium polyacrylate particles were synthesized using the inverse suspension polymerization technique, and their thermal an…
Manganese(III) complexes of tetra-anionic and tetra-cationic porphyrins have been immobilised on counter-charged, surface-modified silica supports and on organic ion-exchange resins. The reactions of these supported manganese(III) porphyrin systems and analogous uncharged homogeneous systems have been examined using c…
In order to investigate the temperature rise of the workpiece during equal channel angular pressing (ECAP), a lumped heat transfer analysis was made. The main deforming zone was taken as the analysis domain. The temperature rise due to the work of plastic deformation and the frictional heat was considered. An equation…
This paper reviews the studies on the electronic structures and spectroscopic properties of sandwich-type complexes M ( Pc ) 2 and M 2 ( Pc ) 3 . The subjects discussed are as follows. (1) Electronic spectra of closed-shell Pc dimers and trimers. The complexes with closed-shell systems, such as [ Lu ( Pc ) 2 ] − , Sn…
Chemiluminescence, size exclusion chromatography, differential scanning calorimetry, thermogravimetry, and Fourier transform infrared spectroscopy were used to assess differences in oxidation rate between two different pro-oxidant systems in degradable low-density polyethylene. The pro-oxidant formulation used consist…
Solid state 29Si and 31P MAS NMR have been used to investigate the microstructural changes occurring in phosphosilicate gels during their conversion from a gel to the corresponding gel-derived glasses by heating. The studied gels have the molar compositions 10P2O5·90SiO2 and 30P2O5·70SiO2. It was found that the dried…
Lorentz correction is used to correct the intensities of X-ray scattering of single-crystal diffractometry in order to recalculate intensities to obtain structure factors. This correction reduces the intensities to zero at zero diffraction angle. Small-angle scattering is used to study the dimensions of heterogeneitie…