Materials Literature
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The core electron satellite spectrum accompanying a 1s ionisation in atomic Ne is studied using monochromatised X-ray excited (1487 eV photon energy) photoelectron spectroscopy. Several new 2s-3s satellites are observed and assigned. The shake-off limits for the 2p-np and 2s-ns series are determined and also the conti…
BaTiO 3 positive temperature coefficient of resistance (PTCR) ceramics were prepared using commercially available BaTiO 3 which was doped with 0.4 mol.% Ho to make it semiconducting. The samples were sintered in air at 1320 degrees C and while cooling to room temperature, different samples were annealed at 1220 degree…
The main purpose of this review is to expound results related to the production of ordinary sound waves by electrical discharges. Work on different kinds of discharge especially glow, arc and 'true' corona are presented and classified according to the relative importance of different acoustic source terms, namely the…
Spin-resolved photoemission from polycrystalline Cr${\mathrm{O}}_{2}$ films shows a spin polarization ($P$) of nearly +100% for binding energies near 2 eV below the Fermi level (${E}_{\mathrm{F}}$). Despite the metallic resistivity behavior, extremely low intensity is observed in the photoemission spectra near ${E}_{\…
The results of ODMR experiments carried out whilst monitoring the luminescence bands of silver- and gold-doped ZnS are presented. Doping of ZnS with silver results in the appearance of three emission bands peaking at 440, 520 and 650 nm. The ODMR results show that the 440 and 650 nm bands are the results of recombinat…
The glycolytic enzyme phosphoglycerate kinase has been prepared from the extreme thermophile Thermus thermophilus . In contrast to its eukaryote equivalents (yeast and horse muscle) this prokaryotic enzyme crystallizes from ammonium sulphate in the presence of nucleotide substrates. These crystals are of a form and si…
Abstract Magnetoacoustic emission (MAE) and Barkhausen emission (BE) have been measured as a function of applied magnetic field and tensile stress from mild-steel samples in a wide range of heat treatments, to develop a technique to measure stress without prior knowledge of the microstructure. The results are suppleme…
Extended x-ray-absorption fine-structure measurements have been made on the Ge and Pb edges of ferroelectric ${\mathrm{Pb}}_{1\ensuremath{-}x}{\mathrm{Ge}}_{x}\mathrm{Te}$ disordered alloys. Our results show that Ge atoms are displaced approximately 0.8 \AA{} from the cell center both below and above the transition, i…
High-resolution x-ray scattering studies of thin smectic-$C$ ($\mathrm{Sm}C$) samples prepared between solid plates by cooling from the smectic-$A$ phase reveal a surprising "chevron" structure of tilted layers. This structure is formed as a response to the shrinking of the $\mathrm{Sm}C$ layers while anchored to the…
The embedded-atom method, a semiempirical theory of metal bonding, is investigated as a method to calculate the bonding in a covalent material. A simple first-neighbor embedded-atom method model is sufficient to explain the geometry and structure of many metastable phases of silicon, but not its shear behavior. To obt…
This paper presents an extensive study of the conditions of appearance of mechanical twinning and its role in the texture development during uniaxial tension, biaxial expansion and rolling of Ti and Zr alloys. With the help of literature, the analyses are extended to alloys of Mg, Zn and Be. Finally, the influence of…
Synopsis In cosmetology eye shadows are often presented as pressed powders. The pressed powder studied contains about 80% of lamellar substances such as talc and titanised mica, pigments, preservatives and a liquid binder which is a mixture of lipophilic substances. Usually cohesion in compacts is obtained by establis…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text PARAS N. PRASAD, "Organic polymers as nonlinear optical materials," Optics News 13(12), 34-35 (1987) Export Citation BibTex Endnote (RIS) HTML Plain Te…
Article The crystal structure and predicted magnetic behavior of NaCu(IO3)3 – a quasi-one-dimensional magnetic system was published on December 1, 1987 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 181, issue 1-4).
Homoserine kinase (EC 2.7.1.39), one of the enzymes of l-threonine synthesis, was purified 200-fold from the phototrophic bacterium Rhodospirillum rubrum strain S1 by salt precipitation, hydrophobic interaction chromatography and gel filtration. The enzyme had a Mr of about 145000 and was active with l-homoserine (Km=…
A series of cell calculations for the Chernobyl reactor was performed using the SRAC code system to provide its fundamental neutronic characteristics for the accident analysis at JAERI. The calculations are based on a two-step cell modelling. The primary cell is supposed on a unit square graphite block of 25cm × 25cm…
Abstract A new method for preparing block copolyarylates via two‐step interfacial polycondensation is proposed. First, oligomers with acid chloride end groups were obtained from interfacial polycondensation with a mole ratio of bisphenol A to diacid chloride(s) less than I. In the second step, two reaction systems con…
Complexes of the type type ML2.2H2O of Co(II), Ni(II) and Cu(II) with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (LH) have been prepared and characterized on the basis of elemental analyses, magnetic susceptibility measurements, infrared and electronic spectral data. All the complexes are high-spin six-coordinated…
The resistivity of gold films with thicknesses between 18 and 52 nm is measured from 4.2 to 310 K. The effect of the deposition of thin (1.5 mm) gold layers on top of these films will be discussed. During the deposition and the subsequent resistivity measurements the samples are kept under high vacuum conditions insid…
Abstract According to field studies of the Pugu Hill kaolin deposit and mineralogical investigations (X-ray, SEM), two main types of Miocene sandstones are distinguished: (i) clayey-silty kaolinitic sandstones with stacks of idiomorphic pseudohexagonal kaolinite crystals; (ii) massive clayey-silty kaolinitic sandstone…