Materials Literature
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Cr–SiC composite coatings were plated in Cr(VI) baths containing SiC green powder. Analysis of Cr–SiC coatings has demonstrated a relatively low percentage (about 0·1–0·9 wt-%) of the particles incorporated into the Cr coating. XPS data suggest that the surface of SiC was covered with a layer of SiO2 formed as a resul…
Abstract The tensile behaviour of fully degummed filaments of two commercial varieties of silk produced in India, namely mulberry (Bombyx mori) and tasar (Antheraea mylitta), has been investigated in dry and wet state. The tensile properties were correlated with the structures and morphologies of these two varieties o…
Several diarylethene derivatives having various substituents at the reactive carbons were prepared and the quantum yields were measured. Although the cyclization quantum yields were scarcely affected by the introduction of substituents, the cycloreversion quantum yields varied depending on the substituents.
From the changes in energy band, density of state (DOS) and electronic structure calculated by the DFT/B3LYP method, the conductivity of carbon doped boron-nitride nanotube (BNNT), which is formed by C-C bond substituting B-N bond, was discussed. The results indicate that the substitution will strengthen the conductiv…
Classical molecular dynamics simulations and density functional theory calculations are performed to obtain insights about the attachment of the copper(II) ion to the lowest generation poly(amido-amine) dendrimer, G0-OH, in aqueous solutions. Various initial configurations of the ion relative to the dendrimer sites ar…
The size and severity of grinding machining cracks in a sintered reaction bonded silicon nitride are compared to data for other silicon nitrides. Crack sizes follow a similar trend with grinding wheel grit size despite differences in microstructures, strengths, and fracture toughnesses. Silicon nitrides with enhanced…
A model is presented to predict the decarburization rate of electrical steels during reactive annealing. In a first step, the warm annealing atmosphere composition is calculated as function of the composition of the cold gas containing N2-H2-H2O-CO-CO2-CH4-O2. In a second step, the decarburization kinetics, which is c…
Abstract Shaped charges with different angles or/and different liner wall thicknesses have been tested against an explosive reactive armor sandwich. The reason was to find out if more robust shaped charges give more residual penetration against an ERA sandwich, compared to shaped charges with more penetration performa…
In a series of oxides RFe 2 O 4 (R = rare earth between Dy and Lu, or Y), equal numbers of Fe 2 + and Fe 3 + are located on a layer composed of two triangular nets stacked together. These oxides have several phase transitions where the arrangement of Fe 2 + and Fe 3 + ions transforms from one type to another. Unique d…
Abstract The atomic structure of synthetic, deuterated goslarite (ZnSO 4 ·7D 2 O), a = 11.8176(6) Å, b = 12.0755(7) Å, c = 6.8270(4)Å, space group P 2 1 2 1 2 1 , Z = 4, has been refined in a combined neutron powder diffraction and X-ray single-crystal data refinement to wRp 1.92%, Rp 1.45% and R(F 2 ) 12.66% for the…
Abstract Aflock of New Zealand Halfbred hoggets and three flocks of Merino hoggets were shorn and wrinkle score determined. There was a small (0.2 μm) decrease in fibre diameter with each unit of increase in wrinkle score ( P = 0.003) in one Merino flock (Flock C), but this trend was not significant in the other three…
Abstract The dinuclear metal dioxide Ni 2 O 2 + is prepared by the reaction of gaseous Ni 2 + with N 2 O in a Fourier‐transform ion‐cyclotron‐resonance (FT‐ICR) mass spectrometer. The title compound oxidizes CO, thus proving the catalytic activity of Ni 2 + for mediating oxygen‐atom transfer from N 2 O to CO. Whereas…
The present article gives a brief overview of studies made at S. P. Timoshenko Institute of Mechanics of the National Academy of Sciences of Ukraine on thermomechanics of coupled fields in nonlinear inelastic passive and piezoactive materials and bodies under monoharmonic deformation. Our attention will be focused on…
Thermotropic ionic liquid crystals with a pyridinium skeleton were synthesized and the effects of counter ions for the liquid crystal formation were examined. The liquid crystal formation depended on the counter anions. The pyridinium liquid crystal, having chloride counter ion, showed columnar, cubic, and smectic A p…
A electrospinning process to prepare soft tissue engineering scaffold was introduced in this study. This kind of scaffold was composed with ultrathin fiber and characterized with high porosity, well-interconnected pores and high surface-to-volume ratio. Biodegradable polylaticacid (PLA) was used to spin the scaffold a…
A novel tartaric acid modified fatty amide diol (TAFA) was synthesized through the condensation polymerization of N,N‐bis(2‐hydroxy ethyl) linseed oil fatty amide and tartaric acid (TA).The structural elucidation of the TAFA resin was carried out by FT‐IR,1H‐NMR, and 13C‐NMR spectroscopic techniques. The physico‐mecha…
Abstract Structural characterisation of hexamine cage complexes, two containing diamagnetic Co III and one containing paramagnetic Cu II , to which both rather short (C 4 ) and relatively long (C 13 ) alkyl substituents have been attached, shows that while the longer “tail” introduces an anticipated bilayer form to th…
An analytic expression for the electromagnetic enhancement of the spontaneous emission rate and Raman scattering cross-section for an excited atom or molecule in close proximity to a metal nanocylinder has been derived by quantum theory. Coupling of the atomic or molecular optical radiation into the TM0 surface plasmo…
We have extensively measured the resistance of NbSe 3 near critical pressure ( P 1 = 3.2 GPa) for the upper charge-density-wave ( T 1 -CDW) phase. We reveal that the T 1 -CDW coexists with the superconducting (SC) phase between 2.0 GPa and 2.9 GPa. Near P 1 on the T 1 -CDW side, the T 1 -CDW transition temperature app…
Abstract A metal–semiconductor–metal photoconductive detector has been fabricated from porous silicon. To that aim low conductive p‐type Si (20 Ω cm) has been porosified and several rapid‐thermal treatment steps applied before deposition of Al‐contacts. The photo response was investigated in the wavelength range of 35…