Materials Literature
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Recombinant collagens are attractive proteins for a number of biomedical applications. To date, significant progress was made in the large-scale production of nonmodified recombinant collagens; however, engineering of novel collagen-like proteins according to customized specifications has not been addressed. Herein we…
Melusin is a muscle specific protein required for heart hypertrophy in response to mechanical overload. Here we describe a protein 63% homologous to melusin, named chp-1, expressed in all tissues tested, including muscles, and highly conserved from invertebrates to human. Both proteins are characterized in their N-ter…
Partial discharge (PD) classification is a powerful way to predict insulation problems of the windings of rotating machinery. While online PD tests have been carried out for over 40 years, effective diagnostic methods are still under development. In this paper, a practical diagnostic method is proposed based on an imp…
[reaction: see text] Reaction of tetraaryl-m-benziporphyrin with pyridine and silver tetrafluoroborate yields 22-pyridiniumyl-m-benziporphyrin as the only substitution product. This compound is further rearranged to a fused m-benziphlorin containing a 4a-azafluorene fragment. A mechanism involving a high-valent silver…
As-synthesized MCM-48 was modified via silylation with Cl−Si(CH 3 ) 3 . The resulting silylated MCM-48 possesses a well-ordered long-range structure, a narrow distribution of nanosized pore diameters, a high mesoporous volume, a large specific surface area, and, most significantly, a hydrophobic surface. A nanocomposi…
Abstract Hyperbranched poly(glycidol) alkali sulfate (SHPG‐M) was prepared based on hyperbranched poly(glycidol). Polyurethane–hyperbranched poly(glycidol) (PU–SHPG‐M) sulfate electrolyte is a kind of single ionic or cationic conducting polymer electrolyte. Such a single ionic polymer electrolyte can obviously reduce…
A large number of distribution transformers, currently utilized in low voltage (LV) power systems are of dry-type design. This includes, the IEEE Class II ventilated dry-type design with 3-phase kVA ratings in the approximate range of 500 kVA - 2.5 MVA and primary voltage ratings ranging from 4.16 kV to 34.5 kV and th…
A new instrument based on acoustic methods has been designed which is offering non-invasive condition assessment of Gas Insulated Substations (GIS) during normal service. The instrument will be able to reveal many of the defects resulting in breakdown of GIS and will in general have a significant cost benefit. Based o…
An analytical technique that can be effectively used for the calculation of the end winding leakage inductance of a turbogenerator has been presented. It is based on a 3-D geometric model of the end winding region in which each coil is modeled as a set of serially connected straight filaments. The calculation of the m…
Highloft nonwovens are low density fabrics characterized by a high ratio of thickness to weight per unit area, which means that highlofts contain considerable void volume. They are usually made of synthetic fibers. The present research effort was directed to study cotton blended highlofts. The major problems with usin…
Abstract A thermoplastic vulcanizate (TPV) of an ethylene propylene diene terpolymer (EPDM) and nylon copolymer (PA) was prepared. Maleic anhydride‐grafted EPDM (EPDM‐ g ‐MAH) and MAH‐grafted EPR (EPR‐ g ‐MAH) were used as compatibilizers and sulfur was used as a curative. The phase morphology of EPDM/PA TPVs was inve…
This paper describes the formation of poly(methyl methacrylate)- b -poly(dimethylamino ethylmethacrylate)- b -poly(methyl methacrylate) (PMMA- b - PDAEMA- b -PMMA) and poly(methyl acrylate)- b -poly(methyl methacrylate)- b -poly(hydroxyethyl methacrylate) (PMA- b -PMMA- b -PHEMA) brushes and phase segregation by these…
Electronic absorption and Soret-excited resonance Raman (RR) spectra are reported for bis-N-alkylimidazole and bis-pyridine complexes of various cross-trans-linked iron(II)-"basket-handle" porphyrins (Fe(II)-BHP) in methylene chloride. These compounds enable us to characterize the spectroscopic properties of ruffled s…
Abstract Core–shell structured particles, which comprise the rubbery core and glassy layers, were prepared by emulsifier‐free emulsion polymerization of poly( n ‐butyl acrylate/methyl methacrylate)/polystyrene [P( n ‐BA/MMA)/PS]. The particle diameter was about 0.22 μm, and the rubbery core was uncrosslinked and light…
Abstract The composition of the volatile oil from the radix of Scrophularia ningpoensis has been investigated by capillary GC, GC–MS. The oil contained 103 volatile components, of which 3.49% were terpenoids. The main constituents were fatty acids, such as palmitic acid (25.40%), linoleic acid (10.04%), α ‐linolenic a…
The authors investigated the application of newly developed stereoregular syndiotactic polypropylene (s-PP) which was synthesized with homogeneous metallocene catalyst to the insulation of electric power cable. The electrical and thermal characteristics of s-PP are revealed to be superior to these of cross-linked poly…
Very good quantitative agreement was found between the experimental and simulated switching transients of a Si avalanche transistor at extreme currents. Two-dimensional (2-D) simulations were performed using the device simulator ATLAS (Silvaco Inc.). Marked current localization was found, which was of a nondestructive…
Here the author presents a brief background and the history of complex media, in particular the materials with negative permittivity and permeability, and then he discusses some of the salient electromagnetic features of these metamaterials. This is followed by description of some of the ideas regarding potential futu…
A metamaterial coupler made of a regular microstrip line and a negative-refractive-index (NRI) line is examined. Peculiar coupling effects are observed in which co-directional traveling waves result in contra-directional Poynting vectors on the lines thus leading to power being coupled backwards. This coupler demonstr…
Previously, the genetic algorithm (GA) approach for direct-space crystal structure solution from powder diffraction data has been applied successfully in the structure determination of a range of organic molecular materials. In this article, we present a further development of our approach, namely a multipopulation pa…