Materials Literature
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Heterogen katalysierte Sharpless-Epoxidierung: Ein Weinsäurederivat wurde auf der Oberfläche von SiO2 und in den Mesoporen von MCM-41 fixiert (siehe Bild). So erhaltene chirale Titan-Katalysatoren sind bezüglich Umsatzzahl und Enantioselektivität genauso effektiv wie entsprechende Komplexe in Lösung, und das Epoxidier…
The thickness change of extruded low density polyethylene (LDPE) foam as a function of the blowing agent and aircounter diffusion during the post-extrusion aging process is modeled. The blowing agent and air counter diffusion equations are coupled with the viscoelastic equations to model the foam volume shrinkage and…
We have prepared magnetic anisotropic polycrystalline hexaferrites Ba(ZnTi)/sub x/Fe/sub 12-2x/O/sub 19/ with high orientation degrees f and low dielectric loss tangent tg/spl delta//sub /spl epsiv// by standard ceramic techniques with magnetic alignment of the grains' c axis during wet pressing and in flowing-oxygen…
EBSD orientation mapping has been used to derive subgrain boundary misorientation distributions in a series of hot deformed and etched NaCl samples. The main objective of this study has been to examine the influence of data processing, noise caused by angular resolution limits and step size on the subgrain misorientat…
We have studied metallic and oxidized chromium layers on thin ordered alumina films grown on a NiAl(110) substrate using x-ray photoelectron spectroscopy. The interaction between the chromium layers and the substrate has been characterized after deposition at room temperature and after oxidation at 300 and 700 K. Our…
Abstract Tofu, containing high viscosity chitosan dissolved in a δ-gluconolactone solution, was prepared and physico-chemical properties, microstructure, textural properties and sensory characteristics were investigated. Moisture content and pH of the chitosan tofu were slightly lower than those of the control tofu. T…
We present an inclusive macroscopic model of ferromagnetic hysteresis. We developed the model from a Stoner-Wohlfarth approach by adding the mean-field or nearest-neighbor interactions and the effect of pinning. The model includes features of the Jiles-Atherton model in the previous Atherton-Beattie extension of the S…
The influence of the tin octanoate catalyst on the physical and thermal properties of RTV 5370 polysiloxane rubbers has been studied. To assess the likely influence of crosslinking on a number of physical and thermal properties in polysiloxanes, model siloxane networks (representing networks of well defined compositio…
We explore the origin of visible photoluminescence in nanoscale silicon cones fabricated by reactive ion etching in silicon-on-insulator substrates utilizing rough silver films as masks. Photoluminescence (PL) visible to the naked eye was observed after oxidation and annealing. Samples oxidized at 900 °C exhibit inten…
Carbon steel (CS) coupons covered with an artificial biofilm—which consisted of 0.6% agarose and diluted activated sludge (150 mg/L) from a municipal wastewater plant—were exposed to synthetic wastewater. When only one side of the coupon was covered with the artificial biofilm, mass loss of the steel coupon reached 0.…
Poly(L-lactide)–poly(ethylene glycol) (PLA–PEG) multiblock copolymers with predetermined short blocks (Mn ≤ 3000) were synthesized by polyesterification of PLA diols with PEG diacids in the presence of dicyclohexycarbodiimide and dimethylamide pyridine. The molecular structure and morphological features of the resulti…
This paper presents the iron-loss analysis of an induction motor model core. We have analyzed the induction motor model by using the improved finite-element method considering the vector magnetic properties, which means the relation between the magnetic flux density B vector and the magnetic field strength H vector. A…
Abstract An investigation on in situ polymerization of styrene in deproteinized natural rubber (DPNR) latex and high ammonia natural rubber (HANR) latex was carried out. The ratio of styrene to dry rubber was fixed at 25 : 75 by weight. It was observed that, at reaction temperature of 60 °C and reaction time of 10 hou…
In this paper, a deep analysis of the behavior of transformer winding impedances for high frequencies is performed. The properties of inductance matrices are analyzed, as well as the possibility of making assumptions and their range of validity. The properties of resistance matrices are also analyzed, which has not be…
A novel class of composites for optics, microcavities doped with metal fractal aggregates, is studied. Lasing and broad-band Stokes and anti-Stokes emission from (Ag colloidal aggregates)/(adsorbed molecules)/(micro-cavity) composite at low-intensity cw and pulse laser excitation has been found. At 633 nm cw excitatio…
Abstract The composition and structure of heavy‐duty diesel engine piston deposits generated in a Caterpillar 1Y540 single‐cylinder bench test engine according to the Caterpillar 1N test procedure have been investigated using infrared spectroscopy, x‐ray diffraction (XRD), x‐ray photoelectron spectroscopy (XPS), XPS d…
Abstract A static ultrasonic treatment device was used to investigate the effect of ultrasound on devulcanization of unfilled SBR disks in the absence of shearing effect. Some visible bubbles were observed at the center of the disk sample at low pressure, as well as at the edges at high pressure, as the treatment time…
A new method has been developed to determine the misfit of disc-shaped precipitates in a matrix using transmission electron microscopy (TEM). The method is applicable to specimens containing a high precipitate density, where the classical TEM method, based on the extent of the precipitate diffraction contrast cannot b…
Time-stepping finite-element methods have been widely used to compute the magnetic field of electrical machines. Because the reluctivities of magnetic materials are nonlinear, the finite-element equations have to be solved iteratively. In this paper, an effective method for reducing the computing time of the Newton-Ra…
A temperature scanning attachment for the polarizing microscope is described that offers a simple but powerful technique with which to detect even subtle paramorphotic phase transitions in liquid crystals with high temperature resolution. This technique was applied to CE8, a well known reference compound exhibiting ri…