Materials Literature
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Two-dimensional, partially flexible polymers interacting with each other through the Onsager-like excluded-volume interaction are shown to exhibit a second-order, isotropic-nematic transition at a sufficiently high density. The instability of the free energy under the influence of a nematic state is investigated and t…
Abstract The surface modification of polyethylene in a remote nitrogen, oxygen, and hydrogen dc discharge plasma was investigated. In the case of the nitrogen plasma a strong correlation exists between the concentration of active nitrogen species, as detected by Langmuir probe measurements and plasma emission spectros…
Molecular dynamics simulations of porous silica in the density range 2.2--0.1 g/${\mathrm{cm}}^{3}$ are carried out on a 41 472 particle system using a multiple instruction multiple data computer. The internal surface area, pore surface-to-volume ratio, pore size distribution, fractal dimension, correlation length, an…
Elastic moduli of $^{13}\mathrm{C}$ diamond, deduced from the Brillouin shifts experienced by inelastically scattered monochromatic radiation, are \ensuremath{\sim}0.5% higher than the corresponding values for natural diamond. This suggests $^{13}\mathrm{C}$ diamond is harder than natural diamond. A simple model incor…
Inelastic neutron scattering and molecular dynamics simulations provide evidence for the existence of low-frequency floppy modes in the high-temperature phase of cristobalite, which are analogous to those found in network glasses. The behavior is similar to that observed in computer simulations of orientationally diso…
Abstract Biaxial stretching of polypropylene sheets containing CaCO 3 filler results in microporous sheets, that feel soft and dry. Their properties depend on filler content, particle size of the filler, and stretching degree etc. We have studied the dependency of some properties of the microporous polypropylene sheet…
Indium tin oxide films were grown by pulsed laser deposition on glass substrates. The electrical and optical properties of these films were studied. At optimized oxygen pressures, films with resistivity values of 1.4×10−4 and 5.6×10−4 Ω cm were deposited at substrate temperatures of 310 and 20 °C, respectively. Films…
The time-dependent density functional approach is used to calculate the wave-vector dispersion of the surface plasmon of Ag. The 5s conduction electrons are treated as a semi-infinite homogeneous electron gas and the influence of the 4d electrons is described in terms of a polarizable medium. It is shown that the redu…
Directionally oriented peptide layers 1000 angstroms thick were constructed by polymerization on gold and indium-tin-oxide glass. A key feature is the use of an appropriately functionalized surface on which the initiation sites for polymerization are spaced at distances consistent with the helical diameter of the pept…
Effect of chemical corrosion on the tensile strengths of five types of Bangladeshi timbers (kadom, simul, koroi, mango, and debdaro) and their composites has been evaluated. Wood–plastic composites (WPC) formed by the gamma-radiation induction polymerization of butylmethacrylate (BMA) with those timbers show better re…
The selection of a nonwoven air filter structure that is optimal for specific conditions is not simple and is affected by many factors. Traditionally, the selection process is based on experience and professional instinct. However, this approach to decision-making lacks an objective basis for making comparisons betwee…
The paper reviews the economic and traditional medicinal uses of the plants, Calotropis gigantean and C. procera from the published literature from various of India. The ethno-medicinal uses of the former species in Orissa are also incorporated. Their distribution in India, Botany, Physical and Chemical properties of…
KDP crystals were examined by transmission electron microscopy (TEM). Transmission electron diffraction (TED) patterns and images of some crystal areas indicated the existence of the second orthorhombic phase in tetragonal KDP crystals at room temperature. The lattice parameters of this orthorhombic phase are almost t…
The loading capability of a 500 kV high-voltage DC (HVDC) transformer bushing is calculated with some unusual conditions: the internal oil circulation in the bushing is blocked at the flange level and the ambient air temperature is raised to 60 degrees C. The theoretical model was verified with a full-scale heat run t…
Abstract Although alluded to occasionally during the previous discussions of chemistries used for reactive processing, the physical nature of the product probably has a significant effect on its useful properties. At the same time, the chemistries used often are dominant in the preparation of the final product. This i…
By assuming that diffusion of the dopant molecules in argon gas within the crucible is the limiting step of the evaporation, a model for dopant concentration in Czochralski silicon melt is derived. The dopant concentration in the melt during crystal growth can be expressed as where is an evaporation parameter defined…
Epitaxial Ga 2 Se 3 films were grown by molecular beam epitaxy on GaP substrates. The photoinduced oxidation of epitaxial Ga 2 Se 3 was observed using Ar + laser irradiation. Furthermore, it was suggested from the Auger analysis that the crystal structure of oxidized material was Ga 2 O 3 . The transparency of Ga 2 Se…
Abstract Intensities of the OD stretching modes in the Raman spectra of LiX solutions (X = Cl, Br and I) in CH 3 OD were measured. It is shown that the intensities increase significantly with increasing halide concentration owing to a pre‐resonance Raman effect arising from charge‐transfer states of hydrogen bonds bet…
XPS spectra were recorded for the InAs(110) surface. For comparison, data were acquired for a sample cleaved in situ (Accession #00107) and for a sample exposed to air for 60 min (Accession #00108). The electronic record includes the In 4d, As 3d, In 3d, As LNN, In MNN, and the valence band region.
Brachytherapy for ocular melanoma uses 125I seeds backed by a gold shield. Conflicting results are reported in the literature on the effect of the gold on dose close to the seeds. In this work, a small lucite jig was constructed such that the seed-to-detector separation remained fixed as high-Z materials of lead, silv…