Materials Literature
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We have compared the quality of ZnO films grown on Si(111) substrates by two different methods: (1) initial Zn layer deposition followed by its oxidation and (2) thin MgO buffer layer deposition prior to the growth. All the layers are deposited by molecular beam epitaxy using a radio frequency radical cell. X-ray diff…
In the framework of schematic hard-spheres lattice models for granular media we investigate the phenomenon of the "jamming transition". In particular, using Edwards' approach, by analytical calculations at a mean-field level, we derive the system phase diagram and show that "jamming" corresponds to a phase transition…
Abstract The photo-excited structures of [Pt2(pop)4]4− and [Pt2(pop)2(popH)2]2−, (pop = diphosphite) in five kinds of complexes were analyzed by X-rays. For the complex with tetrabutylammonium (Bu), tetrapentylammonium (Pn), benzyltriethylammonium (Bzte), or benzyltributylammonium (Bztbu) as a counter cation, the Pt c…
Abstract A novel miniature mixer called the “Alberta Polymer Asymmetric Minimixer” (APAM) was designed, built and tested. In this study, polymer blends and nanofiber composites were compounded using a total of approximately 2 grams per sample. This mixer has a unique, asymmetric design consisting of a varying clearanc…
Single walled carbon nanotubes grown suspended between pillars of Si/SiO 2 structures are straightened by ion beam scans. In addition, the ion irradiation selectively removes nanotubes lying on the substrate, leaving the suspended nanotubes in place. This strategy provides a facile way to produce large area connected…
Ultrasonic atomic force microscopy (UAFM) was used to investigate the elasticity variation on domain boundary (DB) in lead zirconate titanate (PZT). The UAFM imaged the change in contact stiffness not only among grains but also on the DB. According to an analysis, the contact stiffness of the DB was approximately 10%…
An extensive program of shaking table tests on 1/4-scale three-dimensional R/C frames was jointly carried out by the Department of Structure, Soil Mechanics and Engineering Geology (DiSGG) of the University of Basilicata, Italy, and the National Laboratory of Civil Engineering (LNEC), Portugal. It was aimed at evaluat…
The liquid crystalline character of salts resulting from the interaction of poly(propylene imine) dendrimers with 3-cholesteryloxycarbonylpropanoic acid has been studied. The supramolecular structure and consequently the observed liquid crystalline phases are dictated by the degree of protonation of primary amino grou…
The scientists involved in this study attempted to develop an artificial esophagus constructed of autologous cells grown by cell culture methods on an extracellular matrix. An artificial esophagus consisting of human esophageal epithelial cells, dermal fibroblasts, and smooth muscle cells isolated from the aortic medi…
Electrostatic spinning was applied to the preparation of drug-laden nanofiber for potential use in oral and topical drug delivery. While this technique is in its infancy with regard to pharmaceutical applications, a number of recent publications suggest that it may be of high value in the formulation of poorly water-s…
Abnormal grain growth in Pb(Mg 1/3 Nb 2/3 )O 3 –35 mol% PbTiO 3 (PMN‐35PT) ceramics doped with Li 2 O and PbO has been investigated. Replacing the PbO dopant with up to 2 mol% Li 2 O caused an increase in the number of abnormal grains. For the composition containing 2 mol% Li 2 O and 6 mol% PbO, the amount of abnormal…
This article presents an overview of some of the significant developments in rotating machine insulation systems that have occurred in the past century. This article describes the chronological development of insulation materials and systems, together with some of the key innovations in manufacturing. For the most par…
We suggest a practical approach for modeling frequency-dependent losses in ferrite cores for circuit simulation. Previous work has concentrated on the effect of eddy-current losses on the shape of the B--H loop, but in this paper we look at the problem from the perspective of energy loss and propose a different networ…
Two species of Achnanthidium, which are fairly common in benthic samples collected from North American rivers, have posed considerable identification problems for analysts enumerating diatoms for water quality assessment programs in the United States. Both diatoms belong to the apparently diverse and insufficiently st…
The mechanosynthesis of piezoelectric perovskite 0.92Pb(Zn 1/3 Nb 2/3 )O 3 –0.08PbTiO 3 (PZN–PT) by direct mechanochemical activation of the constituent oxides has been studied by X‐ray diffraction (XRD) and transmission electron microscopy (TEM). This and the PbO flux method are the only two procedures that have succ…
Abstract Summary: Multi‐walled carbon nanotubes (MWNTs) have been successfully modified with polyacrylonitrile (PAN) by a cathodic electrochemical process. The surface‐modified MWNTs afforded are then dispersible in good solvents for PAN, such as N , N ‐dimethylformamide (DMF). Collected from a dilute dispersion, thes…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Collagen VIII is an extracellular matrix macromolecule comprising two polypeptide chains, alpha1(VIII) and alpha2(VIII), that can form homotrimers in vitro and in vivo. Here, recombinant collagen VIII was expressed to study its supramolecular assembly following secretion. Cells transfected with alpha1(VIII) or alpha2(…
This research deals with the antibacterial efficacy of a nanosized silver colloidal solution and its application to nonwoven fabrics. The nutrient solution including the nanosized silver colloidal solution or the nanosilver treated nonwovens are placed on germ containing agar plates and inoculated with gram-positive a…
A cation-modified multiwalled carbon nanotube is used to template the noncovalent self-assembly in solution of a gold nanowire from crown-modified gold nanoparticles. The driving force for self-assembly is formation of the surface-confined pseudorotaxane that results from the electron-poor cation threading the electro…