Materials Literature
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We report on a synthesis of novel thymidine based organogelators and a study of their gelation types in relation to structure and solvent, using various data acquired through FT-IR, SEM images and differential scanning calorimetry.
This approach describes the destruction free evaluation of the ageing behaviour of polymeric cable insulations using a new dielectric method. Ageing is influenced by electrical, physical, mechanical and morphological properties. All these changes have a strong influence on the residual strength and the lifetime of a p…
Abstract The drop coating technique was applied to generate thin films of various polymer nanospheres as a basis for the preparation of AgFON (Ag films over nanospheres). In contrast to the well known spin coating technique, the chosen procedure also allows the use of multiwell (microtiter) plates as substrate, thereb…
This paper presents a new method of partial discharge data analysis for the investigation of space charge and degradation phenomena in high voltage insulation systems. The basic principles of the pulse-sequence-analysis are illustrated and the characteristic differences with regard to standard procedures that have bee…
The accumulation of space charge in solid dielectrics is examined from the macroscopic point of view using electromagnetic field theory. For practical dielectrics, it is shown that the occurrence of such charges is an inherent consequence of a non-uniform conductivity. The influence of both temperature and electric fi…
Open-cell polyetherurethane foams impregnated with polypyrrole were utilized as amine sensors. These foams were prepared via gas-phase loading of iodine followed by exposure to pyrrole vapor. These foams exhibited reproducible resistance responses upon exposure to triethylamine vapor. Furthermore, the sensor response…
Chemical cleaning of the GaAs(100) surface has been studied with high-resolution photoemission spectroscopy using synchrotron radiation (in the range of 30–1300 eV) at the Stanford Synchrotron Radiation Laboratory. The high surface sensitivity of the technique has allowed us to identify the chemical state of the surfa…
The progress of the interfacial reaction of polystyrene chains end-capped by a primary amine (PS-NH 2 ) and PMMA chains end-capped by an anhydride (PMMA-anh) has been monitored by SEC-UV, by using anthracene-labeled polystyrene chains (anth-PS-NH 2 ) as a probe. Assemblies of an anth-PS-NH 2 layer and a PMMA-anh layer…
The adsorption and decomposition reactions of dimethyl methylphosphonate (DMMP) on cerium and iron oxides supported on aluminum oxide have been examined at 25 °C. The capacities of these solids for the decomposition of DMMP have been measured, and the identities and amounts of the decomposition products determined. Th…
An analysis of the edge effect in high-frequency transformers is performed by modeling the winding as either all-foil or wire-foil. The effects of the winding positions in the core and the winding widths on the AC resistance and leakage inductance of the transformer are investigated by using the two-dimensional finite…
A very clean route to porous materials , utilizing the combination of conventional solution and supercritical fluid processing, is exploited to prepare porous tissue engineering scaffolds that contain biologically active material for controlled release. This allows accurate dosing of the biological agent, whilst retai…
Abstract The electrochemical deposition of Au/Co multilayers into 20 μm‐thick ion track etched polycarbonate membranes with pore diameters of 110–150 nm was studied in a single electrolyte containing cobalt sulfate, gold cyanide, and citric acid. Cyclic voltammetry, chronoamperometry, and pulse‐potential experiments w…
Proteins that distinguish the crystallographic planes of zeolites have been identified. On EMT zeolite the proteins obscure only the (001) face and are able to immobilize an enzyme with negligible loss of activity (see dye‐exclusion assay, Figure). A general method for isolating proteins able to distinguish spatial or…
A study several of available technologies used to construct low-profile, planar transformers is presented. Finite element analysis is used to determine an appropriate winding configuration with low AC resistance and leakage inductance. The advantages and disadvantages of printed circuit board (PCB), flex-circuit and s…
A full procedure to model high frequency magnetic components has been developed. A finite element analysis (FEA) tool is used to compute the frequency behavior of the windings, taking into account geometry and frequency effects, like skin, proximity, interleaving, gap and end effects. The capacitive effects among the…
Some recent theory in the area of rubberlike elasticity is illustrated by the analysis of strain-induced crystallization, chain entanglements in networks through constraint models, junction fluctuations and neutron scattering, and phase separations in oriented gels. Experimental techniques for characterizing elastomer…
A new polyoxometalate derivative {PW9V3O40[Ag(2,2′-bipy)]2[Ag2(2,2′-bipy)3]2} 1 has been hydrothermally synthesized and structurally characterized by the single crystal X-ray diffraction. X-Ray analysis showed that both [Ag(2,2′-bipy)]+ and [Ag2(2,2′-bipy)3]2+ units are supported on the α-Keggin polyoxoanion [PW9V3O40…
The effect of zeolite composition and structure on XPS core level binding energies has been studied for a large class of zeolites (FAU, MFI, MOR, LTA) differing in their counterions (Na, K, Rb, Ca, Mg, Ba) and Si:Al ratio (1 to 160). Whereas absolute binding energies cannot be determined to any reasonable degree of ac…
A new transformer model for a multiple-winding transformer, which describes the leakage phenomenon, is presented. The unique feature of the model is that each parameter in the model corresponds to a physical magnetic flux. The model parameters can be determined by using the finite element tool. The model can also be c…
Growth of and hydrogen production by wild-type (WT) Rhodovulum sulfidophilum were compared with those by one of its mutants lacking the poly(3-hydroxybutyrate) (PHB) biosynthesis ability (PNM2). During phototrophic growth under aerobic conditions with fixed illumination, changes in the extinction coefficient and PHB c…