Materials Literature
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We have measured the electrical resistivity of NbSe3 between 2 K and room temperature up to a pressure of 7.2 GPa. At P1 = 3.5 GPa we observe the extinction of the high-temperature charge density wave (T1-CDW) and the enhancement of the superconducting critical temperature Tc to 5 K. The logarithmic pressure slopes of…
Computer simulations of hydrocarbon and related molecules using empirical force fields have become important tools for studying a number of biological and related processes at the atomic scale. Traditional force fields, however, cannot be used to simulate dynamic chemical reactivity that involves changes in atomic hyb…
Liquidus phase relationships have been investigated in the peraluminous system Qz (SiO 2 ) - Ab (NaAlSi 3 O 8 ) - Or (KAlSi 3 O 8 ) - Al 2 O 3 - H 2 O - CO 2 . The experiments have been performed at 2 kbar, 750 to 850°C and at H 2 O-undersaturated conditions (H 2 O-activity close to 0.5). An aluminosilicate phase (mul…
An unusually REE-rich piemontite was found near Colonnata on the northern slope of Monte Brugiana and La Rocchetta, Alpi Apuane, Italy. Quantitative chemical analyses show a total amount of rare earth elements ranging from 2.85 to 8.06 (oxides wt%) with lanthanum prevailing on the others. Structural data obtained on f…
The phase transition and compressibility of Mn 3 O 4 have been investigated at room temperature with X-ray diffraction diamond-anvil cell experiments up to 38.7 GPa. At pressures below 10 GPa a tetragonal phase is present, having the hausmannite structure, whereas at higher pressure the hausmannite phase transforms in…
The effects of simulated transport of calves for 150 min on plasma cortisol, NEFA, glucose, and calcium were evaluated. Both cortisol and NEFA reached maximal values within 30-60 min, with no further increases during the transportation. Changes in glucose and calcium were not significant. The results indicate that in…
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…