Materials Literature
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A two-dimensional, lattice-Monte Carlo approach, based upon the energy minimization of an ensemble of electric dipoles, was developed to simulate ferroelectric domain behavior. The model utilizes a Hamiltonian for the total energy based upon electrostatic terms involving dipole–dipole interactions, local polarization…
Titanium diboride can be produced by ball‐milling a mixture of TiO 2 , B 2 O 3 , and Mg metal for between 10 and 15 h. The reaction was found to be completed during the milling with no evidence of residual Mg. The unwanted phase, MgO, was readily removed by leaching in acid. The leached powder obtained after 15 h mill…
The three-dimensional crystal structure of Serratia marcescens endonuclease has been refined at 1.1 A resolution to an R factor of 12.9% and an R(free) of 15.6% with the use of anisotropic temperature factors. The model contains 3694 non-H atoms, 715 water molecules, four sulfate ions and two Mg(2+)-binding sites at t…
Lorentz microscopy combined with conventional transmission electron microscopy were used to image the magnetic domains and microstructures of sintered Sm(CobalCuxFe0.06Zr0.03)z (0.088⩽x⩽0.128; 5.8⩽z⩽7.2) permanent magnets which were specifically designed for high temperature applications. The microstructural data were…
The mineralogical and chemical characteristics of saprolites and soils developed from granulitic, monzonitic, and charnockitic gneisses and mylonites of the Blue Ridge Mountains and western Piedmont foothills of central Virginia, were studied. Micromorphological, x‐ray diffraction (XRD), scanning electron microscopy (…
ZrO 2 powder is prepared by low‐temperature vapor‐phase hydrolysis of ZrCl 4 . TG‐DTA, XRD, Raman, BET, and TEM methods are used to investigate the particle size, phase composition, and agglomeration before and after heat treatment. The results show that the as‐prepared ZrO 2 powder is characterized by large surface a…
The decolorisation of reactive dyeing wastewater with ultraviolet radiation and ultrasonic vibration in the presence of hydrogen peroxide was investigated by a batch operation system. Kinetic studies of the reactive dye were conducted on the effects of pH and peroxide dosage, and the performance of ultrasonic vibratio…
ZnS and ZnMgS layers have been grown onto GaP substrates by molecular beam epitaxy (MBE). The key parameters of the growth are a high substrate temperature and a high sulfur (S) beam pressure. The S beam pressure was typically 1×10−2 Pa, which was more than one order of magnitude larger than in conventional MBE of ZnS…
The magnetic and magnetotransport properties of ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Ni}}_{x}{\mathrm{O}}_{3}$ $(x<~0.4)$ system have been studied. It is found that Ni doping induces a ferromagnetic state to ferromagnetic cluster state transition near the metallic critical…
Density functional theory (DFT) electronic structure calculations were carried out to predict the structures, energetics, and triplet−triplet (T−T) spectra for the low-lying triplet states of free-base porphin (PH 2 ) and its β-octahalogenated derivatives (β-PH 2 X 8; X = F, Cl, Br). The lowest triplet excited state o…
Ultrafine powders of trimetallic orthoferrites containing lanthanum and samarium in various ratios were synthesized by thermal decomposition at low temperatures of the corresponding hexacyano complexes to modulate the functional properties of these perovskite‐type oxides. The precursors and their decomposition product…
Genes for D-galactarate (gar) and D-glucarate (gud) metabolism in Escherichia coli are organized in three transcriptional units: garD, garPLRK, and gudPD. Two observations suggested a common regulator for the three operons. (i) Their expression was triggered by D-galactarate, D-glucarate, and D-glycerate. (ii) Metabol…
In order to evaluate structure-property relations in ferroelectric LC-elastomers concerning netpoint topology and netpoint density, three different elastomers were investigated. As far as the netpoint topology is concerned systems with a crosslinking within the smectic layers (intra-layer) and between different layers…
A nickel foam with a three-dimensional reticulated structure has been prepared by an electrodeposition technique. The microcrystalline structure of the nickel layer was maintained following treatment in air at 600°C for 4 min. Sintering in a reductive decomposed NH3 atmosphere for 40 min, at either 980 or 850°C, trans…
Abstract The effect of molding parameters on material distribution and mechanical properties of co‐injection molded plates has been studied using experimental design. The plates were molded with a polyamide 6 (PA 6) as skin and a 20% glass fiber‐reinforced polybutyleneterephtalate (PBTP) as core. Five molding paramete…
The heat capacity of single crystal La0.7D0.3MnO3, where D=Ca, Sr, has been measured through the Curie point in fields up to 70 kOe. The magnetic contribution of the Ca sample exhibits a sharp heat capacity peak at TC≃218 K in zero field. The peak broadens and decreases in height with increasing field but, unlike an o…
Abstract A lot of fibre and fabric structures or finishing parameters influence the functional properties of fabrics. In order to assess the thermal properties of conventional polyester and microfibre types of fabrics the plate/fabric/plate method for conductivity or cool/warm feeling was used. Fabrics made of microfi…
Abstract Polyurethane elastomers were synthesized using polypropylene glycol (PPG 2000) as the polyol and starch as the multifunctional crosslinker in varying concentrations. Thermal and mechanical properties were measured by DSC, DMA and tensile tests. The morphology was examined by SEM. The swelling behavior of the…
The physical properties of a series of layer double hydroxides (LDH) of the form $[({\mathrm{CO}}_{3}{)}_{0.195(1\ensuremath{-}x)}{\mathrm{Cl}}_{0.39x}({\mathrm{H}}_{2}\mathrm{O}{)}_{y}]:[{\mathrm{Zn}}_{0.61}{\mathrm{Al}}_{0.39}(\mathrm{OH}{)}_{2}],$ $0<~x<~1,$ $0<~y<~(0.4+0.2x)$ have been studied. The hyd…
In search of high-temperature permanent magnet materials, sintered Sm–Co-based magnets with abnormal temperature dependence of intrinsic coercivity have been obtained. These magnets have small negative, or near-zero, or large positive temperature coefficients of intrinsic coercivity. A model of coercivity mechanism ha…