Materials Literature
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The interaction of murein hydrolases and synthases was studied by affinity chromatography. The lytic transglycosylases Slt70 and MltB of E. coli were purified and covalently linked to CNBr-activated Sepharose. Membrane extracts were analyzed for proteins that interact with the immobilized murein hydrolases. Slt70-Seph…
A numerical model for the prediction of microstructure and microsegregation in multicomponent alloys during dendritic solidification using a finite difference scheme is presented. The main kinetic and thermodynamic effects that can influence microsegregation (solid state back diffusion, secondary dendrite arm coarseni…
Abstract The phase changes that took place upon heating an Fe-rich illite (OECD #5) to 1300°C in an oxidizing atmosphere were studied by a variety of mineralogical techniques. Infrared spectra, showing the stepwise dehydroxylation of the illite, showed good agreement with variations in sample colour and Mössbauer spec…
This paper describes the theoretical calculation of the equivalent core loss resistance for a dynamic magnetic core loss model. The equivalent core loss resistance incorporates the effects of both the classical eddy current and anomalous losses. Derivation of a generalized nonlinear core loss resistance expression is…
A rapid whole-pattern profile-matching procedure for the quantitative assessment of multiphase powder diffraction patterns is described. Using a position-sensitive detector, with fixed beam-sample-detector geometry, we report on the efficacy and speed of this method in the quantitative assessment of four different mul…
Light steel-frame building systems are becoming more prevalent in commercial, industrial and residential construction in New Zealand. Tested fire resistance ratings are generally available for non-load-bearing systems, but not for load-bearing applications. This study investigates the performance of load-bearing light…
Nanocomposites (Si 3 N 4 /SiC) were studied by combined high‐resolution transmission electron microscopy and electron energy‐loss spectroscopic imaging (ESI) techniques. In ESI micrographs three types of crystalline grains were distinguished: Si 3 N 4 matrix grains (0.5 μΩ), nanosized SiC particles (<100 nm) embedd…
The third‐order nonlinear optical properties of donor‐acceptor substituted tetraethynylethenes (see figure and also the preceding contribution) are presented with special emphasis on the structure‐property relationships and the effect of conjugation paths on the optical nonlinearity. In one single class of materials t…
We have measured the subpicosecond optical response of a solid-state, semiconductor-to-metal phase transition excited by femtosecond laser pulses. We have determined the dynamic response of the complex refractive index of polycrystalline VO2 thin-films by making pump-probe optical transmission and reflection measureme…
Various blends of a commercial bismaleimide (BMI) mixture, a cyanate ester (CE) and a co-monomer with allyl and cyanate pendant groups were formulated and cured. Differential scanning calorimetry (DSC) data were used to monitor the cure of neat resins, while dynamic mechanical thermal analysis (DMTA) was used to asses…
The thermal conductivity of chemically, structurally, and isotopically highly pure germanium single crystals is investigated experimentally in the temperature range from 2 to 300 K. It is found that the thermal conductivity of germanium enriched to 99.99% 70 Ge is 8 times higher at the maximum than the thermal conduct…
This article describes properties of composites of collagen-hyaluronic acid shaped to layered materials. According to the results, interactions of these two polymers are very strong. The properties can be influenced by chemical crosslinking using glyoxal and starch dialdehyde. The different behavior during enzymatic d…
A function f 2 L 1 (R) tiles the line with a constant weight w using the discrete tile set A if P a2A f(x \\Gamma a) = w almost everywhere. A set A is of bounded density if there is a constant C such that #fa 2 A : n a n + 1g C for all integers n. This paper characterizes compactly supported f 2 L 1 (R) that admit a t…
A borosilicate glass of molar composition 0.${01\mathrm{E}\mathrm{u}}_{2}$${\mathrm{O}}_{3}$\ensuremath{\cdot}0.99(${25\mathrm{N}\mathrm{a}}_{2}$O\ensuremath{\cdot}${50\mathrm{B}}_{2}$${\mathrm{O}}_{3}$\ensuremath{\cdot}${25\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$) has been studied through the optical spectroscopy of the…
Diatoms (Bacillariophyceae) are a widely distributed group of microscopic, unicellular algae that are characterized by siliceous cell walls (frustules). The size, shape and sculpturing of diatom frustules are taxonomically diagnostic. Moreover, because of their siliceous composition, diatoms are often well preserved i…
A method to prevent the reduction of CuO formed on Cu metal during x-ray photoelectron spectroscopy analysis is presented. When a bias voltage of -250 V was applied to the sample surface in the case of non-monochromatic Mg Kα1,2 irradiation, the reduction of CuO to the lower oxide (Cu2+Cu+) was suppressed by 80–90% as…
ABSTRACT Mechanical and barrier properties of corn zein films with butylated hydroxyanisole (BHA), bacterial enzyme, and emulsifier additives were investigated and compared to those of polyvinylidine chloride (PVDC) films. No significant differences (P < 0.05) occurred in elongation, tensile strength, or Young's mo…
Abstract The reaction of cellulose with methoxy‐substituted triphenylmethyl chlorides under homogeneous conditions in the presence of pyridine was carried out with the aim to develop new protective groups for cellulose simply introducable and completely removable under mild conditions. The obtained cellulose ethers di…
Refractory oxide barrier coatings are a promising approach for improving the environmental durability of silicon‐based ceramics in severe environments. The oxidation durability of a newly developed fully crystalline mullite coating on SiC and SiC/SiC composites was investigated under thermal cycling between room tempe…
The first four cumulants of a radial distribution function of diatomic molecules and the first three cumulants for linear triatomic systems have been derived quantum statistically. These moments are directly related to the second- to fourth-order force constants of the chemical bond. The temperature dependence of exte…