Materials Literature
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Previous investigations have suggested that the phototactic behaviour of diatoms, as observed by the accumulation of diatoms in low/moderate intensity light spots and avoidance of high intensity light, is primarily due to a change in cell direction at light/dark boundaries. In order to better determine the nature of t…
Stereoregular poly(ester amide)s (PEAT n ) containing equal amounts of ester and amide groups have been obtained by polycondensation in solution from di- O -methyl- l -tartaric acid and aliphatic amino alcohols H 2 N(CH 2 ) n - 1 CH 2 OH. Suitable synthetic routes were designed to prepare either syndioregic ( s -PEAT…
We have shown that the domain V of bacterial 23 S rRNA could fold denatured proteins to their active state. This segment of 23 S rRNA could further be split into two parts. One part containing mainly the central loop of domain V could bind denatured human carbonic anhydrase I stably. This association could be reversed…
Preparation of a nonchromate, self-healing protective film on an Fe surface was attempted. A protective film of 1,2-bis(triethoxysilyl)ethane ([C2H5O]3 Si[CH2]2 Si[OC2H5]3) polymer containing a fine powder of ammonium heptamolybdate tetrahydrate ([NH4]6Mo7O24·4H2O) was prepared on a surface of Fe electrode passivated…
The structural transformations of flavylium ion in aqueous solutions caused by pH jumps and photoexcitation have been investigated. At pH < 1, the stable form is the colored cationic species (AH+). By increasing pH, the concentration of AH+ decreases and, at pH = 5, this form is no longer present. The species obtained…
High performance phase change optical recording disk has been developed by using an oxygen-doped Ge–Sb–Te recording layer. The 5×105 overwrite cycles were achieved with this 6 at. % oxygen-doped phase change optical recording disk. The transmission electron microscope observation shows that the crystal grain size was…
GaAs when exposed to a 7 V anodic bias in aqueous HCl, forms pitted structures from which visible photoluminescence has been observed. Previous work in our laboratory identified the source of the luminescence to be arsenic oxide microcrystals, formed during the electrochemical oxidation, which evolve in composition an…
The dipole moments, dipole polarizabilities, and the first and second hyperpolarizabilities of the Group IIb sulfides have been calculated by using different high-level-correlated methods and including both the relativistic and vibrational contributions. The electron correlation effects have been studied at the levels…
The bulk chemical composition, mineral chemistry and clay mineralogy of soils developed on granodiorite parent materials were investigated in Yosemite National Park in the Sierra Nevada, CA. The soils studied were developed on glacial moraines estimated to be ∼20 Ka (Tioga), ∼130 Ka (Tahoe) and ∼300 Ka (pre-Tahoe) in…
We report on a light-induced phenomenon in dye-doped liquid crystals (LCs) with the distinctive features of molecular transport and assembly at micron scales. Under single-beam laser irradiation, the dye molecules phase separate from the LC host and assemble onto the cell substrate. Although the intensity of incident…
Abstract From scanning tunneling microscopy (STM) and atomic force microscopy (AFM) measurements, it was found that the lateral dimensions of the nanocrystallites systematically decrease with decreasing diameter of the primary particles. Furthermore these experiments suggest that these nanocrystallites, unregularly ti…
A methodology is presented for computing the deformation texture of polycrystalline metals that exhibit both crystallographic slip and mechanical twinning. Texturing is calculated by integrating a conservation equation for the orientation distribution function cast over an angle-axis parametrization of orientations. T…
Abstract An electron backscattering pattern (EBSP) is formed on a fluorescent (or other) screen from the faster scattered electrons when a single‐crystal region of a solid sample is illuminated by a finely focused electron beam (EB). The EBSP is very similar in appearance to the electron channeling pattern (ECP) that…
This paper deals with the impact behavior of natural fiber-reinforced epoxy foams. The effects of different types of fibers, fiber content and void content were discussed. It was found that the woven flax fiber results in composites with better impact strengths than the woven jute fiber based composites. The impact da…
The relaxation of stresses associated to extrinsic grain-boundary dislocations (EGBDs) in singular ∑ = 3, {111}, in vicinal ∑ = 11, {311} and in general ∑ = 11, {332} grain boundaries (GBs) has been investigated by in-situ transmission electron microscopy (TEM) using weak-beam conditions. In a singular ∑ = 3, {111} GB…
The use of oleochemical derivatives is dominated by applications in the field of surfactants and emulsifiers. There also is a remarkable amount of highly specialised uses, for example in lubricants and as additives to modify the characteristics of polymers. Besides this, some products have been developed on the basis…
The dynamic mechanical properties of A-glass bead filled polypropylene (PP)/ethylene–propylene–diene monomers polymer (EPDM) ternary composites have been measured over a temperature range from −80 °C to 100 °C and at a fixed frequency of 1 Hz, using a dynamic mechanical analyser (DMA), to identify the effects of the f…
The structure of buffalo lactoferrin has been determined at 303 K. The crystals belong to orthorhombic space group P2(1)2(1)2(1), with unit-cell parameters a = 77.5, b = 91.0, c = 131.5 A and Z = 4. The structure has been refined to an R factor of 0.187. The overall structure of the protein is similar to its structure…
Our early model for predicting nonwoven fabric stress-strain behavior by the finite element method is generalized to include the effects of fiber curl, which is shown to have a great effect on the tensile behavior of the fabric. A numerical method to characterize the lateral contraction of nonwovens during tensile def…
Two “self-complexing” macrocycles (22ab and 23ab) based on a methylthio-substituted derivative of the electron donor tetrathiafulvalene (TTF) and a cyclic bipyridinium acceptor have been prepared.[1] When “decomplexed” by fractional crystallization, the rigid compound 22b was not able to undergo “recomplexation” to an…