Materials Literature
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Arsenic antisites in GaAs layers grown by molecular-beam epitaxy at low substrate temperatures (∼200 °C) were observed using electron paramagnetic resonance (EPR), magnetic circular dichroism in absorption (MCDA), and MCDA-detected EPR. This observation confirms that there is a MCDA band directly associated with arsen…
This is the third in a series of papers on the ab initio calculation of the third and fourth derivatives of the energy of a molecule. In this paper derivatives with respect to electric field components, as well as with respect to nuclear coordinates are considered. A knowledge of these derivatives yields, in particula…
A high-resolution x-ray study of the nematic--to--smectic ${\mathit{A}}_{1}$ phase transition of 8OPCBOB gives a critical exponent for the susceptibility \ensuremath{\gamma}=1.39\ifmmode\pm\else\textpm\fi{}0.08, and for the parallel correlation length ${\ensuremath{\nu}}_{\mathrm{\ensuremath{\parallel}}}$=0.71\ifmmode…
Optical study of point disclinations in the two-dimensional director field of freely suspended smectic-C liquid-crystal films shows that these defects exhibit Brownian spontanous positional fluctuations.
Textured diamond films have been deposited on β-SiC via microwave plasma chemical vapor deposition preceded by an in situ bias pretreatment that enhances nucleation. Approximately 50% of the initial diamond nuclei appear to be aligned with the C(001) planes parallel to the SiC(001), and C[110] directions parallel to t…
The diffuseness of the ferroelectric phase transition in ${\mathrm{PbMg}}_{1/3}$${\mathrm{Nb}}_{2/3}$${\mathrm{O}}_{3}$ is proposed to be due to quenched random electric fields originating from charged compositional fluctuations. They are responsible for the extreme critical slowing down, the freezing into nanometric…
Abstract Macromolecular data processing is an extensive topic, which has been developed considerably in recent years with the advent of commercially available area detectors and the new Laue methods utilising synchrotron radiation. Rather than giving what could only be a superficial overview of all aspects of data pro…
Abstract The purpose of this study is to develop a steady‐state thermal model for melt spinning of polyester fiber by incorporating the radial heat conduction inside the fiber and the combined effect of radiation and convection at the boundary. The governing equations are obtained from the energy, mass, and momentum b…
Abstract The influence of compatibilization on the dynamic mechanical properties of polypropylene (PP) binary blends with polyamide‐11 (PA) has been investigated. In the blends an acrylic acid functionized PP was used as a blend component and compared with nonfunctionized PP over the who concentration range. The resul…
Abstract Binary blend of high‐density polyethylene (HDPE) and linear low‐density polyethylene (LLDPE), prepared by melt mixing in an extruder, in the entire range of blending ratio, is studied for crystallization behavior by differential scanning calorimetry (DSC) and X‐ray diffraction measurements. Cocrystallization…
Abstract A novel cellulose solution, prepared by dissolving an alkali‐soluble cellulose, which was obtained by the steam explosion treatment on almost pure natural cellulose (soft wood pulp), into the aqueous sodium hydroxide solution with specific concentration (9.1 wt %) was employed for the first time to prepare a…
The isolation of chitosan from a fungal source offers the potential of a product with controlled physicochemical properties not obtainable by the commercial chemical conversion of crustacean chitin. A variety of culture and processing protocols using Mucor rouxii were studied for their effects on biomass yield and chi…
Phason-strained octagonal quasicrystal phases of Mo-Cr-Ni have been studied by electron diffraction and dark-field imaging. The shifting of some of the diffraction spots lowers the symmetry from eightfold to fourfold. Diffraction patterns of the orthogonal twofold axes show that the shifted spots are split along the f…
A procedure for the patterned synthesis of porous Si exhibiting visible luminescence is described. Anodic electrochemical etch of n- or p-type Si in ethanol/HF solution leads directly to porous Si that luminesces with λmax between 750 and 650 nm. Positive and negative patterns of luminescent porous Si are etched into…
The growth of diamondlike films and overlayers by the depsotion of energetic carbon atoms has been investigated by molecular-dynamics simulations. The interatomic many-atom potential suggested by Tersoff is used. The structurel analysis of the grown films shows that there is an energy window between 40 and 70 eV for t…
We have studied the stability of the luminescence from porous Si in the presence of a variety of ambient gases (e.g., N2, H2, forming gas, and O2). Although the optical properties are fairly stable under most conditions, illumination in the presence of O2 causes a substantial decrease in luminescence efficiency. Infra…
Analytic results are presented for the dynamic behavior of sliding charge-density waves (CDW's) and related extended nonlinear systems with randomness. It is shown that, in the limit of long times, a sliding configuration approaches a unique solution. In CDW models, the velocity of this asymptotic solution is periodic…
On the basis of different types of experiments, the authors develop implicitly the model of surface-enhanced Raman scattering (SERS) of adsorbates on metal surfaces. The long-range enhancement by resonances of the macroscopic laser and Stokes field is separated quantitatively from the metal electron-mediated resonance…
The performance of a new type of grid-supplemented corona voltage stabilizer and regulator (TCVSR) device is described. The normal corona wire-plane voltage stabilizer and regulator was provided by a grid above the anode. The slopes of the stabilization curve have been found to be strongly dependent on the grid voltag…
An experimental program was conducted to determine the role of boric acid on the pitting behavior of alloy 600 steam generator tubes. The test solution consisted of 5620 wppm Cl−, 3984 wppm SO4=, and 500 wppm Cu++ yielding a Cl−/SO4= ratio of 1.4. Boric acid was added in amounts of 0, 50, 100, 200, 500, 1000, and 2000…