Materials Literature
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The 351 nm photoelectron spectra of Mo− and MoO− have been measured. The electron affinity of atomic molybdenum is 0.748(2) eV and that of molybdenum monoxide is 1.290(6) eV. The term energies of several MoO electronic states not previously observed are obtained and compared with ab initio predictions. The ground stat…
Abstract Rectangular plates were injection molded from two grades of commercial polypropylene (PP) differing in the molar mass distribution. The mold was mechanically sealed when a desired pressure p i ,max (up to 1560 bar) was reached. Samples were taken from each plate at different distances from the gate and were i…
Conductive polyaniline was synthesized in aqueous 1.0M oxalic acid containing 0.1 M aniline by electrochemical and chemical oxidation and characterized by conductivity, solubility, ultraviolet and infrared spectroscopy, and cyclic voltammetry. The solubility experiments showed that the solubility of oxalic acid-doped…
We succeeded in further improvement of the stability of 3-isopropylmalate dehydrogenase (IPMDH) from an extreme thermophile, Thermus thermophilus, by a suppressor mutation method. We previously constructed a chimeric IPMDH consisting of portions of thermophile and mesophile enzymes. The chimeric enzyme is less thermos…
Mixtures of yttrium and aluminum isobutyrates, M(O 2 CCHMe 2 ) 3 = M(O 2 CiPr) 3 (M = Y or Al), were examined as precursors for processing yttrium aluminum garnet (YAG, A1 5 Y 3 O 12 ). Both precursors were synthesized by reacting the respective metal with isobutyric acid. The individual compounds and the 5Al(O 2 CiPr…
The profound influence of low‐temperature processing steps, hitherto assumed benign from the viewpoint of texture development, is reported. On inclusion of a 400°C step and further heat treatment at 700°C, PZT (40/60) sol‐gel thin films with a strong (111) texture were obtained. When the 400°C step was excluded, the f…
Abstract Structures of poly(ether ether ketone ketone)‐poly(ether biphenyl ether ketone ketone) copolymers were studied by using small angle X‐ray scattering and the one‐dimensional electron density correlation function method. The results revealed that structures of the aggregated state of the copolymers depend close…
This book provides clearly-written, easy-to-understand definitions for over 4,500 terms. In addition to covering the more traditional areas of the field, this fourth edition also defines the terminology of the rapidly advancing areas of small size mechanical engineering: micromachining and nanotechnology. Nomenclature…
The regularities of polyesterification in the presence of a filler as a heterogeneous matrix were considered. The filler introduced into the reaction system before polycondensation process influenced not only the reaction kinetics but also the resulting properties of polymer composites produced. The composites obtaine…
Conference Article| February 01 1996 Structure and mechanism of GTP cyclohydrolase I of Escherichia coli Herbert Nar; Herbert Nar ‡Max-Planck-Institut für Biochemie, Am Klopferspitz, D-82152 Martinsried, Federal Republic of Germany Search for other works by this author on: This Site PubMed Google Scholar Robert Huber;…
This paper systematically investigates the effect of a number of geometric parameters on the texturing performance of air-jet texturing nozzles. In order to facilitate the research, an air-jet texturing nozzle with a rectangular cross section has been developed. The texturing performance of the nozzles is assessed by…
Abstract A novel method was developed for the preparation of high‐resistivity conductive polymer composites reproducibly. The conventional method which involves the simple mixing of a conductive filler and a polymer usually produces a conductive polymer composite having a loading curve with a region in which the resis…
Coesite, a high-pressure ${\mathrm{SiO}}_{2}$ polymorph, becomes amorphous during isothermal annealing below the glass transition temperature, ${\mathit{T}}_{\mathit{g}}$, at one-bar pressure. Transmission electron microscopy was used to examine this fusion process (vitrification) below ${\mathit{T}}_{\mathit{g}}$. Th…
Abstract The thermal stability of sodium alginate (SA) and its graft copolymers of acrylonitrile (AN), methyl acrylate (MA), ethyl acrylate (EA) and methyl methacrylate (MMA) has been examined in air atmosphere by means of thermogravimetric analysis. The following order of decreasing stability was found from character…
Abstract Einkristalle von Pr(CH 3 CH 2 COO) 3 (H 2 O) 3 wurden durch Auflösen von frisch gefälltem Praseodymhydroxid in verdünnter Propionsäure und anschließendes Eindunsten bei Raumtemperatur an der Luft erhalten. Die Kristallstruktur (monoklin, P2 1 /c, Z = 4, a = 1034,2(2) pm, b = 1521,2(3) pm, c = 2086,3(7) pm, β…
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Safe cathodic protection (CP) limits are required for prestressed steel in concrete to avoid the risk of hydrogen embrittlement (HE). A CP protection potential more positive than the reversible hydrogen potential is one approach for avoidance of HE. However, it has been demonstrated in the literature that the steel te…
A series of samples of the system Zn x Mg0.8—x Ni0.2Fe2O4 (with x=0,0.2,0.4,0.6 and 0.8), was prepared using the usual ceramic technique. The samples were studies using X-ray diffraction, DTA, TG, TGA and IR spectroscopy. The lattice constant, radius of tetrahedral ion, X-ray density and measured bulk density are foun…
The critical pitting potentials (Epit) of type 304 (UNS S30400) stainless steel (SS) were determined as a function of temperature (373 K to 523 K) and chloride (Cl−) concentration (1.00 x 10−2 mol/kg-H2O to 2.09 mol/kg-H2O [4.54 x 10−3 mol/lb-H2O to 9.48 x 10−1 mol/lb-H2O], m). Steady polarization tests were performed…
The reactivity ratios have been determined for a mesogenic/nonmesogenic comonomer system, namely 5-[4-(4′-methoxyphenyl)phenoxy]pentyl methacrylate/methyl methacrylate. The reactivity ratios were found to be equal and approximately unity. The copolymerization is, therefore, azeotropic and the resulting copolymers poss…