Materials Literature
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A mail survey was conducted to assess the types of household footwear currently being worn by a random sample of independently living men and women aged 65 years and older as well as their needs related to the purchase and wearing of household footwear. Questionnaires were completed by 128 people. The greatest number…
Using a scanning electron microscope, pleomorphism (notably filamentation) was seen when Escherichia coli was grown under starvation conditions for 14 d on microporous silicon wafers, titanium, glass and plastic discs. Under these conditions, the 'standard', rod shaped cell (1-3 microns) failed to separate after divis…
We report the calculation of the second-harmonic-generation (SHG) coefficients of ${\mathrm{LiB}}_{3}{\mathrm{O}}_{5}$ (LBO), ${\mathrm{CsB}}_{3}{\mathrm{O}}_{5}$ (CBO), and ${\mathrm{BaB}}_{2}{\mathrm{O}}_{4}$ (BBO) using the linearized augmented plane-wave band method in the local-density approximation with a scisso…
Abstract Chitosan has been used to form miscible, biodegradable blends with hydrophilic synthetic polymers as PVA and PEO. Characterisation of the blends by DSC, IR and microscopy analysis was made giving much attention to possible interactions of molecular polar group in the polymer chains. PVA/chitosan are found to…
Powder samples of were prepared at 1000°C by the combustion method. The emission spectrum of showed two kinds of emissions, which could be assigned to ions in the Sr site and the Y site. Reducing brought a broad band emission around 470 nm, which could be attributed to crystal defects introduced by the reduction. The…
The biodegradable polymer poly(D,L-lactide-co-glycolide) was synthesized by a ring-opening precipitation polymerization in supercritical CO2 using stannous octoate as initiator. Following polymerization, unreacted monomer was removed by supercritical fluid extraction and the polymer was recovered as a porous solid upo…
Kinetics of various α/β-Si3N4→α′/β′-SiAlON transformations were investigated for SiAlON ceramics with additions of rare-earth cations. It was determined that α-Si3N4 starting powders lead to faster Si3N4→α′/β′-SiAlON transformations than β-Si3N4 powders. In reactions with a two-phase α′/β′-SiAlON product, the formatio…
The organic silsesquioxanne, methylsilsesquioxanne (MSQ), has a low dielectric constant because of its lower film density compared to thermal oxide. However, the quality of MSQ film is degraded by the damage of oxygen plasma and hygroscopic behavior during photoresist stripping. In this work, we studied the plasma tre…
We present an x-ray-diffraction study performed in the different states of the molecular glass-forming liquid triphenyl phosphite (TPP). Investigations carried out in the apparently amorphous state, the so-called ``glacial'' state, formed from isothermal aging at different temperatures in the range [210 K, 222 K], con…
Magnetotransport phenomena have been investigated for a metallic ferromagnet, ${\mathrm{Sm}}_{2}{\mathrm{Mo}}_{2}{\mathrm{O}}_{7},$ locating on the verge of Mott transition. Large negative magnetoresistance (MR) is observed around the Curie temperature ${(T}_{C})$ for a single crystal, and well below ${T}_{C}$ as well…
For infiltration of a molten salt into porous zirconia (relative densities = 0.56 to 0.88), the infiltration depth was found to be a function of both infiltration time and initial compact density. The intrinsic liquid permeability of the porous Y‐TZP was determined by extrapolation of gas permeability data. Permeabili…
A scaling relation is used to estimate the interfacial tension of phase-separated colloidal dispersions. Conditions are focused on where (i) the strong segregation limit applies, (ii) the interfacial structure is simple, and (iii) the phase separation is entropy driven. Comparison with experimental work on colloid−pol…
Five layered Sr2Bi4Ti5O18 has been prepared in the ceramic form with a view to studying its electrical properties. X-ray and microstructural studies were employed for physical characterization. Detailed electrical property measurements were undertaken so as to understand the basic transport physics of this compound. T…
Fine‐grained (<1 μm) silicon carbide ceramics with high strength were obtained by using ultrafine (∼90 nm) β‐SiC starting powders and a seeding technique for microstructural control. The microstructures of the as‐hot‐pressed and annealed ceramics without α‐SiC seeds consisted of fine, uniform, and equiaxed grains. In…
“Push–pull” nonlinear optical (NLO) chromophores—which consist of an electron-donating group and an electron-withdrawing group connected by a π-conjugated system—with optimized hyperpolarizability tend to lead to materials with reduced stability, solubility, or transparency. It is demonstrated that molecular engineeri…
We obtain analytical expressions for the total magnetic moment and the static spin-correlation functions of the classical Heisenberg model for ultrasmall systems of spins (unit vectors), that interact via isotropic, nearest-neighbor (n-n) exchange and that are subject to a uniform dc magnetic field of arbitrary streng…
This handbook is a comprehensive compilation of physical, electrical, thermal and mechanical properties of pure metals and the effects of fabrication methods, heat treatment, temperature and other factors on these properties. It contains more than 250 quick-reference tables and figures, which are accompanied by explan…
Abstract Amorphous derivates prepared by aqueous reaction of various aluminosilicate clay minerals with concentrated KF solution at 80–110°C were studied for their gas adsorption properties. The four clay minerals studied are halloysite, a well-crystallized kaolinite, a poorly crystallized kaolinite, and a montmorillo…
Low energy ion-induced secondary electron emission from the surface of thin (500–5000 Å) polycrystalline MgO films has been investigated with various noble gas ions at energies ranging from 45 to 300 eV. The dependence of secondary electron emission coefficient γi on the type and energy of ions is reported and interpr…
The transition with increasing x in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{TiO}}_{3}$ from an antiferromagnetic, p-type polaronic conductor to an n-type metal with an enhanced Pauli paramagnetism was investigated by monitoring changes in structure, magnetic properties, and, under different hydrosta…