Materials Literature
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Abstract The effects of La2O3 doping on sintering characteristics and electric properties were studied. Dense, fine-grained ceramics were obtained by La2O3 doping which reduced grain boundary mobility and suppressed rapid grain growth induced by the phase transformation from the low-to high-temperature forms. The diel…
Abstract The ultrasonic enhancement on the hydrolysis of diethyl 1,2-benzenedicarboxylate results from the dissipated heat when the cavitation micro-bubbles were vigorously collapsed. The effective temperature in a solution depends on the nature of the dissolved gas. The relatively broad region that spreads from the i…
Commercial copolymers of 1-octene and ethylene: metallocene catalyzed (mLLDPE) and Ziegler-Natta catalyzed (znLLDPE), a low density polyethylene (LDPE), and high density polyethylene (HDPE), were characterized with respect to branching, crystallization behaviour and dynamic-mechanical properties. It was found that the…
An imide dicarboxylic acid was prepared from 1,6-diaminohexane and trimellitic anhydride and esterified with ethanol. This imide monomer was polycondensed with three different poly(tetramethylene oxide) diols (PTMO-650, PTMO-1000 and PTMO-2000) and with an excess of 1,4-dihydroxybutane. When PTMO-1000 was used, and ev…
X‐ray tomography has been used to investigate the density variations in SiC joints formed using polymer pastes. It has been demonstrated that X‐ray tomography provides accurate bulk density measurements and volumetric density gradients. The results suggest that the magnitude of the applied pressure after green state j…
Abstract The phase transitions of the solid solutions (Ca 1- x Sr x ) 2 MgSi 2 O 7 (0 ≤ x ≤ 0.32) of modulated melilites are studied by X-ray diffraction. The variation of the intensity and the FWHM of satellite reflections reveal different transition temperatures. Two ranges of different ordering are found in the ran…
Abstract New sulfamates KLi(NH 2 SO 3 ) 2 , RbLi ⋅ (NH 2 SO 3 ) 2 and CsLi(NH 2 SO 3 ) 2 were prepared from non-stoichiometric (ratio Li: Me = 3:1) aqueous solutions of LiNH 2 SO 3 and MeNH 2 SO 3 (Me = K, Rb, Cs) at room temperature. Large single crystals of KLi(NH 2 SO 3 ) 2 were grown from these solutions by contro…
Banana plant juice, taken from paradica and maghraby banana pseudostem, as well as black liquor resulting from pulping the banana plant with either 10 or 23 per cent sodium hydroxide (w/w), were identified for their chemical composition. On the other hand the use of these admixtures as anti-corrosive materials was stu…
During a comparative study of second-harmonic generation (SHG) and sum-frequency generation (SFG) in single-crystal and polycrystalline ZnSe, the polycrystalline material showed a dot pattern in the SHG as well as in the SFG output. No such pattern was found in the output from the single-crystal ZnSe sample. The secon…
Abstract The design and construction of a biaxial loading machine is presented in this paper. Two major concerns are addressed in designing the machine: alignment between the loading axes and the specimen, and shear stresses (friction) that may develop between the loading platens and the specimen. The alignment requir…
Plastic deformation of Mo single crystals is examined by direct simulation of dislocation dynamics under stress. Initial dislocation populations are made to mimic real dislocation microstructures observed in transmission electron microscopy cross-sections of pure annealed Mo single crystals. No a priori sources for di…
K2In12Se19 is a new ternary chalcogenide in the system K2Se−In2Se3 (m.p. 997 K; colour: dark red) with the two components in a molar ratio of 1:6. This unusual solid shows a temperature-dependent order-disorder transition originating mainly from a dynamical disorder of In3+ at elevated temperatures. The average struct…
Abstract The thermal degradation of original and aged chloroprene rubber was studied using thermogravimetric analysis. Thermogravimetric analysis (TGA) and differential thermogravimetric analysis (DTG) techniques were used to detect the mass loss during the temperature elevation. By the analysis of the mass loss curve…
The debris coolability analysis module in the severe accident analysis code ‘SAMPSON’ has been enhanced to predict more mechanistically the safety margin of present reactor pressure vessels in a severe accident. The module calculates debris three-dimensional natural convection with simultaneous spreading, melting and…
Scanning electron microscopes (SEMs) are the most extensively used tools for dimensional metrology and defect inspection for integrated circuit technologies with 180 nm and smaller features. Currently, almost all SEMs are designed to collect as many secondary and backscattered electrons as possible. These signals are…
Lipase from Rhizopus japonicus degraded chitosan resulting in soluble chitosan hydrolysates with molecular weight of about 30–50 kDa as shown by size exclusion chromatography. Optimal temperature for the hydrolysis of chitosan was 40C. The chitosan degradation products were fractionated stepwise according to their mol…
A rapidly quenched nanocrystalline Hf11Ni89 alloy was produced by melt-spinning. The x-ray phase analysis shows that the as-quenched ribbon consists mainly of nanocrystalline fcc HfNi5 although a small amount of Ni(Hf) solid solution is also detected. The crystallite size distribution and the dislocation structure of…
Endothelial "capillary leak", the loss of vascular integrity in response to noxious stimuli, is characterized by extravasation of protein-richfluidfrom capillary lumen into surrounding tissue interstitium. This increase in vascular permeability, in response to inflammatory mediators, correlates with endothelial cell c…
The stability of spontaneous polarization in metal/ferroelectric/insulator/semiconductor and related structures is theoretically studied by considering semiconductivity, i.e., the effect of the finite band-gap width. The theory is based on thermodynamics reported previously by us and is extended in order to also exami…
The structure of a high-pressure boron suboxycarbide B(C,O)0.1555 single crystal has been studied for the first time. The unit-cell parameters are a h = 5.618(1), c h = 12.122(1) Å, V = 331.38(1) Å3, sp. gr. R $$\bar 3$$ m, R hkl = 0.0479. The established common structural features of the interstitial rhombohedral α-b…