Materials Literature
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A 90/spl deg/-angle wedge that is isorefractive to the surrounding medium is considered. Under symmetrical incidence by two plane waves of appropriate amplitude, phase and polarization propagating in opposite directions, the edge of the wedge does not scatter and geometrical optics provides the exact solution to the b…
Biofibers have an outstanding potential as a reinforcement in thermoplastics. Theadvantages of natural fibers over traditional reinforcing materials, such as glass fibers, are lowdensity, relatively high toughness, high strength and stiffness, good thermal properties andbiodegradability. Nature fibers are recyclable a…
This paper reports our recent progress on a microbial system for efficient production of biodegradable copolyester of poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate], P(3HB-co-3HHx), with desirable copolymer compositions using genetically engineered bacteria. We have developed a fermentation technique to achieve…
Ultrafine-grained specimens with the average grain size of less than 2µm and medium-grained specimens were prepared from steel plates produced by an advanced thermo-mechanical control process. The smooth specimens were fatigued under axial tension compression at room temperature in air. The fatigue crack initiation pr…
2-(4-tert-Butylphenyl)-5-(4-ethynylphenyl)-1,3,4-oxadiazole reacts with a series of heteroaryl iodides under standard Sonogashira cross-coupling conditions (Pd[PPh(3)](2)Cl(2), CuI, triethylamine, THF) to yield products 2a-g in 40-79% yields (heteroaryl = 2-pyridyl, 3-pyridyl, 4-pyridyl, 2-pyrazyl, 5-bromo-2-pyrimidyl…
The effects of fuel chemical composition on particulate matter (PM) emissions of a T63 engine were investigated. Fuels with different aromatic, cycloparaffin (naphthene), iso-paraffin and normal paraffin levels were evaluated in the turboshaft engine and compared to the performance of a typical JP-8 fuel. The fuels st…
We have determined the shape of the miscibility gap of the Cu–Al–Mn alloy system along the Cu3Al → Mn composition line ((Cu3Al)1 − x Mnx with 0 ⩽ x ⩽ 1) using electrical resistance measurements. Electrical resistance measurements have also been used to study the kinetics of the phase separation that takes place within…
Because of unevenness of moisture fields inside a rice kernel, the key to applying the glass transition hypothesisto explain fissure formation is to map glass transition zones inside rice kernels during the drying process based on the intra-kernel moisture content distribution generated by a finite element scheme. The…
Reaction of [Ni(rac-CTH)(ClO(4))(2)](rac-CTH = rac-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane) with NaN(3) and Cu(NO(3))(2).3H(2)O produces the binuclear complex [Ni(rac-CTH)(mu(1,1)-N(3))(2)Cu(N(3))(2)] 1, which represents the first example of an end-on bridged bimetallic complex; 1 exhibits intramol…
This study investigates the objective hand evaluation of the toilet paper based on the mechanical and surface properties. The objective hand evaluation system for men's suiting was applied to assess the hand of toilet paper. Three primary hand values (stiffness, smoothness, and fullness) for the toilet paper were obta…
We have been studying the reduction of carbonyl compounds by using heterogeneous catalysts in the liquid phase. The reducing reagents were simple primary or secondary alcohols, e.g. 2-propanol. The supported Sn and Zr oxides catalysts were active and selective for the reduction of crotonaldehyde (C4-unsaturated aldehy…
Polysulfone (PSf) membranes that covalently conjugated with aspartic acid (ASP-PSf) were prepared and analyzed for hemocompatability. Compared to PSf or other types of surface-modified PSf membranes, the ASP-PSf membranes had a reduced ability to adsorb protein from either a plasma solution or a mixed solution of albu…
Shape memory alloys based on the intermetallic system Nickel-Titanium (NiTi or NiTinol) are widely used in various kinds of industries. At present, the most popular market is medical industry, in which NiTinol finds a perfect environment with a narrow temperature specification ranging from room to body temperature. In…
Encouraged by theoretical predictions that nematic phases formed from V-shaped compounds could be biaxial, shape-persistent phenylene ethynylene arms linked by 1,3-phenylene, 4,4′-diphenylenemethane and 3,6-fluorenone units have been synthesised. Crystallisation and micro-segregation is prevented by 2,5-alkoxy substit…
For the first time, HF-EPR (94.5 GHz) spectroscopy has been used to determine crystal field parameters in chromium(III) coordination compounds. The large zero-field splitting parameters of the dark-green photochromic trans-RSSR-[CrCl(2)(cyclam)](2)ZnCl(4), 1, the red-purple trans-RSSR-[CrCl(2)(cyclam)]Cl, 2, and the r…
Treatment of octakis(octylthio)porphyrazine (H(2)OOSPz) with cis-bis(benzonitrile)dichloroplatinum(II) in a 1,2,4-trichlorobenzene (TCB)-n-BuOH mixture at 190 degree C affords the asymmetric porphyrazine 2H-heptakis(octylthio)porphyrazine, H(2)HOSPz, in ca. 40% yield. In the key synthetic step the two-electron reduced…
We describe a new method to isolate and concentrate transparent exopolymeric particles (TEP), either naturally occurring or produced by phytoplankton in cultures. The principles of this method are to use TEP‐sticking properties coupled with magnetic properties of paramagnetic microspheres to magnetically and selective…
Hydroxyapatite (HA) is widely used as a bioactive ceramics since it forms a chemical bonding to bone.The disadvantage of this material is its poor mechanical properties.HA can be degraded in body, which is the reason for its bioactivity, but too fast degradation rate could cause negative effects, such as macrophage pr…
En este trabajo se presentan los resultados de la caracterizacion del quitosano obtenido a partir de la modificacion quimica de la quitina. Se ha aplicado el metodo de viscosimetria capilar para determinar el peso molecular promedio viscoso, a partir de la ecuacion de Mark-Houwink; la tecnica de analisis fue validada…
In order to enhance the understanding of the redox equilibriums of uranyl ions in molten NaCl-2CsCl eutectic salt UV-Vis absorption spectrophotometry measurements were performed for UO2 2+ in molten NaCl-2CsCl at 923 K under simultaneous electrolytic control of their ratio. A prominent absorption band at 395 nm was as…