Materials Literature
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This paper presents an analytical approach to the analysis of a single-phase transformer with a virtual air gap. Four auxiliary windings with dc currents that locally saturate the core are embedded in the transformer core. Due to changes in the magnetic characteristics of the core a virtual air gap is created. The met…
Optical components operating in radiation environments, like nuclear facilities, High Energy Physics and space experiments, are exposed to fluxes of energetic particles, which may deteriorate the image quality. In order to avoid undesired failure of such components that is due to changes produced in the material optic…
Dielectric ceramics with compositions belonging to the Ba(Nd x Ti1−2x Nb x )O 3 with varying concentration of x were prepared through Solid State Sintering route using both conventional and microwave sintering. The phase transformations were studied by dielectric measurements in a wide range of temperature and frequen…
Application of fine-grained doubly oriented electrical steel sheets that have a strong {100}texture to synchronous interior permanent magnet motors has been investigated. The alteration in stator core material from high grade nonoriented electrical steel sheets to the doubly oriented material with a simple change in s…
Electric field‐induced deformations of homeotropic nematic liquid crystal layers were studied numerically. A positive sum of the flexoelectric coefficients and a small negative dielectric anisotropy of the nematic material were adopted. Finite surface anchoring strength was assumed. The flow of ionic current was taken…
Abstract Metal complexes of manganese(II), iron(II), and nickel(II) chlorides with acrylamide, [M( O ‐OC(NH 2 )CH=CH 2 ) 4 Cl 2 ] (M = Mn ( 1 ), Fe ( 2 ) and Ni ( 3 )), have been prepared and characterized by single crystal X‐ray diffraction, IR spectroscopy and elemental analyses. The complexes crystallize in the cub…
A series of optical micrographs showing the front region of fiber fuse damage were obtained to reveal the periodic void formation process. They were collected from a number of samples and were sorted in order of increasing distance between the top of the first large void and the top of the first regular void. The micr…
½� tilt grain boundaries (GBs) with misorientation angles h of 43° ,3 7° and 6°. The stationary shape of the migrating triple junction was studied, and the migration rate was measured in-situ between 670 and 688 K using polarized light. In some experimental runs, a facet was formed on the h ¼ 37° 10 1 ½� tilt GB. This…
This paper presents accurate broad-band data on the complex relative permittivity (/spl epsiv/=/spl epsiv/'-j/spl epsiv/") and complex relative permeability (/spl mu/=/spl mu/'-j/spl mu/'') of two U-type hexaferrites. These hexaferrites have a general molecular formula of Ba/sub 4/Me/sub 2/Fe/sub 36/O/sub 60/ where Me…
Giant magnetoelectric (ME) effects have been investigated recently in composites of magnetostrictive and piezoelectric materials. The usage of highly strictive piezoelectric and magnetostrictive materials as well as an increased understanding of their elastic coupling leads to magnetoelectric (ME) responses that are m…
Determination of the magnetic field in open magnetic samples is a very difficult problem. Two basic approaches exist—to calculate the field from the applied current or to measure it near the sample surface. Both depend on the quality of sample-yoke contacts that affect the circuit reluctance and the field gradient abo…
The hydrogen storage capacity of bamboo-shaped multiwalled carbon nanotubes (BS-MWNTs) in ambient conditions was studied by means of the volumetric method, and compared with those of single-walled carbon nanotubes (SWNTs) and multiwalled carbon nanotubes (MWNTs). The BS-MWNTs, whose herringbonelike structure was chara…
Reaction of acidified (pH approximately 7) sodium tungstate solutions with transition metal cations (Fe(3+), Ni(2+), Zn(2+), Co(2+)) leads to the formation of transition-metal-disubstituted Keggin-type heteropolytungstates with 3d-metal ions distributed over three different positions. A detailed investigation of the s…
Diamond films with various crystal qualities were grown by chemical vapor deposition on silicon wafers. Their crystallinity was characterized by Raman scattering and electron backscattering diffraction. By fabricating a device structure for surface acoustic wave (SAW) using these diamond films, the propagation loss wa…
Postconsumer water bottle poly(ethylene terephthalate) (PET) flakes were depolymerized with ethylene glycol (EG) by the glycolysis reaction in the presence of zinc acetate as the catalyst. In the depolymerization reactions, different weight ratios of PET/EG were used. In order to obtain polyesters used as PVC plastici…
Many theoretical and experimental studies have been conducted to understand the mechanisms of heat and mass transfer during deep fat frying. This, in turn, has helped in understanding transport phenomena during frying and the relationships between thermal and physical properties of the products and the frying media. M…
This paper reports the magnetic, electrical, and microstructural properties of epitaxial thin films with an ordered double-perovskite structure. Sr/sub 2/ FeMoO/sub 6/ (SFMO) and Sr/sub 2/ CrReO/sub 6/ (SCRO) films have been grown by sputtering onto the lattice-matched substrates of Ba/sub 0.4/ Sr/sub 0.6/ TiO/sub 3/…
In this paper we show how the grain size of metallic sputtered films can be controlled using a novel sputtering technology (HiTUS). This is evidenced by TEM and grain size analysis, which show changes of up to a factor 10in the mean grain diameter of CoFe thin films. We achieved the grain size control by tuning the ta…
PURPOSE: To establish a reproducible laboratory test to evaluate prospective vascular biomaterials with respect to their thromboinflammatory properties by examining fibrinogen, platelet, and monocyte binding. Endothelial migration onto these surfaces was used as an index of vascular healing. METHODS: To evaluate bioma…
Howmet and Boeing-Seattle jointly evaluated the castability and mechanical characteristics of a modified Russian titanium alloy, Ti-5AI-5Mo-5V-3Cr-0.5Fe (Ti-5553), using wrought alloy starting stock supplied by Boeing. The casting studies conducted at Howmet showed the alloy to be comparable to Ti-6AI-2Sn-4Zr-2Mo-0.08…