Materials Literature
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A front-tracking technique on a fixed Cartesian grid, based on the kinetics of dendritic growth, is used to model the progress of an undercooled columnar dendritic front in non-equilibrium 2D solidification controlled by conduction and thermal natural convection. The effect of the alloy latent heat of fusion is includ…
Through density functional calculation and NMR spectroscopy, an unusual intermediate-spin electronic structure (d(xz)d(yz))3(d(xy))1(d(z)2)1 has been assigned to the six-coordinate saddled [Fe(OETPP)(THF)2]+ complex instead of the corresponding ruffled [Fe(TiPrP)(THF)2]+ complex.
The effect of nano sized particles compared to micro sized particles is explained by the high surface to volume ratio. The influence of different types and concentrations of nano and micro sized fillers on the erosion resistance, the thermal conductivity and the dielectric properties of an unfilled silicone elastomer…
Commercial MAXWELL capacitors were investigated by ac impedance spectroscopy, chronoampero- metry, constant current discharge and other transient techniques in order to determine rated capacitances reliably. Capacitance is outlined as a dynamic quantity that depends on the voltage and the state of charge of the superc…
بيوسوربشن الصدارة ببكتيريا جرام-ف، إما غير المغطى ( فرينديي سيتروباكتر ) أو مغطى ( نيومونيا كليبسيلا ) ميز . بيوسوربشن الصدارة وجد ليتأثر بف الحل، يوقع بالأحرف الأولى على تركيز المعدن، و كمية من الخلايا المسحوقة المجففة و وقت الاتصال . من ثم، سعة البيوسوربشن الأفضل، بالبكتيريا المختبرتين، نيلت في ف 4، تركيز الدليل الأ…
This paper details improvements of the d33 co-efficient for thick-film lead zirconate titanate (PZT) layers. In particular, the effect of blending ball and attritor milled powders has been investigated. Mathematical modeling of the film structure has produced initial experimental values for powder combination percenta…
Single-walled carbon nanotubes (SWNTs) have been effectively wetted and dispersed in saturated sodium hydroxide (NaOH) alcohol-water solutions with little surface damage or shortening of the tubes; the treated material was dissolvable as individual tubes in many common organic solvents.
Thermomechanical processing parameters were adjusted during the processing of Ti-IF steel sheet to obtain microstructures with different grain sizes and precipitation states. The grain size and precipitation state were fully characterized for each specimen in order to investigate the effect of each on mechanical prope…
Transparent magnetic semiconductor films were prepared on glass substrates by a novel chemical process involving ( i ) ZnO deposition from an aqueous solution and ( ii ) the introduction of Fe impurities into the ZnO in another aqueous solution. The former/latter aqueous solutions contain only zinc/iron nitrate and di…
Ultrafine grained microstructures and micro-textures formed dynamically during single-pass, high-Z, large-strain deformation have been analyzed in 0.15C steel. A single pass compression technique capable of imposing large plastic strain up to 4 was employed in the present study. Hardness test data revealed work harden…
Mesoporous hybrid silica-based spheres with functionalized surfaces and abundant highly ordered domains are obtained using for the first time a simple synthetic route based on spray-drying processes.
Blends of 80/20 CPE/NR filled with various silica loadings were prepared, and their properties were determined. It was found that cure properties are influenced significantly by the addition of precipitated silica. Scorch time and cure time decrease with increasing silica loading, which could be explained by the therm…
Although fuel cell vehicles have great potential as future vehicles, it is also realized that further breakthrough technologies to solve essential problems, such as cost and cruising range to be competitive with internal combustion engine vehicles. We have developed a new type of hydrogen-absorbing alloy tank. The hig…
New mixed metal clusters with M19 metal frameworks have been synthesized by NaBH4 reduction of Au(NO3)(PMe2Ph) together with AgNO3 in ethanol. Single crystal X-ray diffraction has revealed Au12Ag7 and Au17Ag2 metal skeletons for these clusters, which are best described in terms of bicapped pentagonal antiprismatic cag…
Mechanical properties of laser-welded castings of Ti-6Al-7Nb alloy, CP Ti, and Co-Cr alloy were investigated and compared to the unwelded castings using a tensile test. Dumbbell-shaped specimens were cut at the center, and two halves of the specimens were welded with an Nd:YAG laser welding machine at 220 or 260 V of…
Series of different macrocyclic liquid crystals consisting of two rod-like aromatic cores connected at both terminal ends by polyether chains have been synthesised by various macrocyclisation reactions (template assisted etherification, Yamaguchi macrolactonisation, Glaser-coupling reaction). The nature and length of…
The historical development of our research on polycondensation that proceeds in a chain-growth polymerization manner ("chain-growth polycondensation") for well-defined condensation polymers is described. We first studied polycondensation in which change of the substituent effect induced by bond formation drove the rea…
A facile route has been developed for the preparation of a new family of oligophenyls based on a 2,5,2',5'-tetra-aryl substituted biphenyl structural motif. The cruciform terphenyl dimer 2,5,2',5'-tetra(4-tert-butylphenyl)-1,1'-biphenyl () has been prepared in a two step protocol as a representative of this interestin…
A quinoidal porphyrin has been synthesised with such a curved pi-system that pi-pi stacking leads to the formation of cyclic trimer aggregates in the crystal, which pack to generate cylindrical channels with an internal diameter of 1.0 nm.
Epoxy resin containing nano-scale silica particles was prepared to evaluate partial discharge degradation and insulation breakdown strength. This material showed superior partial discharge resistance and breakdown strength to epoxy resin without silica particles. Moreover, the focus was on dimension of silica particle…