Materials Literature
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Layered crystals of GaSe are grown by the Bridgman method. Transmission spectra are measured for various sample configurations with respect to the c -axis, applied electric field, direction of incident light and polarization. Absorption edge shifts toward longer wavelength by 20 nm under an electric field of 1 kV/cm,…
All articles of this category 1-(α-Diazobenzyl)pyrene ( 1c ), red prisms stable at room temperature for more than three months, reacted with the p -toluenesulfonic acid salts of amino acids to give the corresponding highly fluorescent amino acid α-(1-pyrenyl)benzyl ester salts in moderate yield. The amino acids were r…
SummaryThe discovery and use of glyoxylic acid as an alternative reducing agent to formaldehyde for electroless copper processes is described. Using glyoxylic acid eliminates the environmental hazards and health and safety concerns associated with formaldehyde. Due to the similarity in chemistry between formaldehyde a…
The corrosion of Zircaloy-4 is accelerated in water or steam above about 350°C when LiOH is present in sufficient concentrations. A short-term test (16 h) to predict inreactor corrosion behavior has been developed based on this accelerated corrosion. A group of claddings with a range of in-reactor corrosion behavior h…
Passive films on high purity Fe-Cr alloys (13-24 mass% Cr), which were prepared by an Ar plasma melting method using high purity Fe produced by a method combining anion exchange and zone-refining processes and high purity Cr produced by an iodide process, have been investigated in-situ in pH 6.0, 1 kmol·m–3 Na2SO4 usi…
Research News/Diamond Thin Film Technology IIb : The second part of this article continues the description of work presented at a two‐week Advanced Study Institute held in the mountains of Tuscany. Topics under discussion were deposition methods, deposition parameters, and applications, including cutting tool inserts,…
Abstract Blends of sulphonated polystyrene, neutralized with metal ions, have been prepared in various proportions with polystyrene homopolymer. Morphology, microstructure, and deformation modes of strained, cast thin films have been examined by transmission electron microscopy. Variables studied include blend composi…
We analyze the effect of space-correlated disorder on diffusion in a one-dimensional continuous disordered medium. We calculate the frequency-dependent diffusion coefficient using a method based on a perturbative treatment around an effective homogeneous medium. Exact results for disorder modeled by a two-level proces…
ZrNi, ZrCo and their hydrides doped with 57 Fe are investigated using Mössbauer spectroscopy. Hydrogenation of ZrNi results first in ZrNiH and then in ZrNiH 3 , whereas only ZrCoH 3 is produced in the case of ZrCo. At low hydrogen concentrations hydrogen atoms enter mainly 4 c 1 interstitial sites, but 8 f 1 , 8 g 2 a…
Transition temperatures for 367 straight chain 4,4′-alkyl/alkoxyphenylbenzoates (through Nov. 1990) have been compiled and critically evaluated. Information was obtained wherever possible, with the exception of the patent literature, and examined for editorial coherency. Line graphs of the melting and clearing tempera…
A neutron diffraction study of a 50 mol kg–1 aqueous solution of deuterated ammonium nitrate [ca. 1 : 1 molecular ratio of D2O : N(1)D4N(2)O3 which is the saturation solubility at ca. 70 °C] was carried out at 100 °C. The first- and second-order isotopic difference methods of neutron diffraction were applied to the ni…
Abstract We propose a method and a system for counting secondary electrons and for displaying micrographs from the SEM in real time. Evaluating the images obtained by the new system, we confirm that electron counting images have a higher signal to noise ratio than analogue images. This tendency is remarkable when the…
Ferroelectric materials such as lead zirconate titanate (PZT) possess several characteristics which are desirable for high density volatile and nonvolatile memories including a high dielectric constant, high speed read/write capability, large remanent polarization, and long term data retention.
The purpose of this study was to characterize crack initiation and growth in notched titanium matrix composites at room temperature. Double-edge-notched or center-open-hole SCS-6/Ti-15-3 specimens containing 0° or both 0° and 90° plies were fatigued. The specimens were tested in the as-fabricated (ASF) and in heat-tre…
Abstract Two-dimensional geometry information contained in SAED spot patterns augmented with EDS elemental data is employed in a computerized phase identification of microcrystalline particles. The initial chemistry screening of a laboratory managed database using the 'bitmap' concept is followed by a geometry search/…
A model is presented for a multiwinding multiphase transformer developed by the nodal inverse inductance matrix (NIIM). To obtain the NIIM the inverse of the inductance matrix is needed. Due to the strong magnetic coupling among the windings, the inductance matrix of a transformer is ill-conditioned. A new way is desc…
A model involving ionic double layers at the surface has been constructed for magnesia‐doped sapphire based on earlier models which were developed for cubic halides. The model takes into account the presence of electrostatic potentials, isolated point defects, defect complexes, and special surface sites which can act…
The dynamic characteristics of externally pressurized, double-pad, circular thrust bearings with membrane variable flow compensation are analytically studied. Under static loads or load composed of a static and cyclic component, membrane compensation gives better overall performance characteristics than capillary (fix…
ある種のアシルグリセロールは微生物産生ポリ (3-ヒドロキシブチレート) (PHB) の優れた可塑剤として作用し, PHBのガラス転移温度 (Tg) を低下させ, 破断伸びを増加させた. 可塑剤として働く脂質は, アルキル鎖長の短い (炭素数5以下) トリアシルグリセロールやアルキル鎖長の長い (炭素数17程度) モノアシルグリセロールであった. 特に, グリセロールトリアセテートは優れた可塑剤であり, PHBに30wt%混合すると, ヤング率を1620MPaから280MPaまで低下させ, 破断伸びをS%から130%まで増加させた. その時, 脂質はPHBと相容し, 非晶部のPHB分子鎖の運動性を上げることを固体13C NMR解析…
The accuracy of elemental analysis by electron energy-loss spectroscopy depends on many factors, such as the concentration of the elements being analysed and the energies of the corre- sponding ionization edges. We discuss sources of inaccuracy in the acquisition and analysis of spectra, in the quantification procedur…