Materials Literature
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The temperature dependence of the parameters characterizing the first peak in the S(Q) and S(Q,E=0) diffraction patterns of vitreous boron trioxide is considered in some detail. The analysis of the experimental spectra is aided by results derived from molecular-dynamics simulations, which enable us to isolate the most…
The thickness and wall profiles of twin boundaries are analysed using a novel 7-circle diffractometer. The diffractometer allows the rapid measurement of rocking curves with angular resolution of 0.001° for two orthogonal rocking angles and for the detector position. Position sensitive detectors can be rotated indepen…
The emission decay kinetics and relative quantum yields of exciton luminescence of ${\mathrm{Cu}}^{2+}$-doped (3%) quasi-one-dimensional antiferromagnetic crystals ${\mathrm{CsMnCl}}_{3}$\ensuremath{\cdot}${2\mathrm{H}}_{2}$O have been studied in the temperature range from 4.2 to 77 K. The experimental emission decay…
Two vapotrons from the Joint European Torus (JET) actively cooled divertor design have been fitted by the Japan Atomic Energy Research Institute with unidirectional high-conductivity carbon-fiber-composite tiles and have been tested in the JET Neutral Beam Test Bed. The test section showed excellent uniformity and acc…
The density, molar volume, refractive index, molar refractivity, and infrared and XANES spectra of CeO 2 –Al 2 O 3 –SiO 2 glasses prepared at 1600° C for 3 h in N 2 have been investigated. The IR reflection data are treated by Kramers-Kronig transformation. Results of IR spectra show that ceria is the network modifier…
We have developed a simple interferometric microscope suitable for in situ observation of crystal growth. The device consists of a light emitting diode (LED) light source, a slightly modified microscope, and a charge coupled device (CCD) camera, all of which are inexpensive and commercially available. In addition to i…
This paper describes a technique developed to measure the uniaxial compressive stress - strain properties of polymers at strain rates appropriate to ballistic and impact events over time scales of tens of microseconds using a crossbow as the projectile launch system. The instrument constructed represents a novel devel…
Perchlorinated derivatives of the common o-diimine chelate ligands 2,2′-bipyridine and 1,10- phenanthroline were synthesized and tested for their coordination behavior towards metal ions. Octachloro-1,10-phenanthroline (ocp) was obtained via chlorination with PCl 5 under pressure (300 ° C, 18 h). It fails to form stab…
Abstract Charge trapping effects were studied in bilayers of conducting polymers composed of poly( N ‐methylpyrrole) (PMPy) and polypyrrole (PPy), by comparing redox charges of the polymer [ Q (ox/red)] obtained by integration of cyclic voltammetric and chronoamperometric curves for single films and bilayers with vari…
Abstract Photocyclization of the substituted 2‐(naphth‐1‐yl)‐3‐(thien‐2‐yl)propenoic acid ( 3 ) in the presence of iodine and air in a benzene‐cyclohexane mixture afforded a separable mixture of three compounds, phenanthro[2,1‐ b ]thiophene‐10‐carboxylic acid ( 4 ), phenanthro[2,1‐ b ]thiothene ( 5 ), and naphtho[1,8‐…
Abstract Based upon long‐term experiences with accelerating ageing tests of polymeric materials and composite insulators, the authors give a contribution to an improvement of the reproducibility and results' validity of the salt‐fog procedure. The following parameters and criteria standardized are critically evaluated…
Cast macrostructure has long been considered an important metallurgical feature in determining the mechanical properties of high-chromium white irons. To explore this relationship, the US Bureau of Mines has looked at a series of high-chromium white irons cast at different superheat temperatures (75 and 250 °C) and th…
The effect of filament initial modulus on textured yarn properties is studied, keeping other parameters constant. Initial modulus has a major influence on textured yarn properties. An increased initial modulus causes poor texturizability and therefore in ferior textured yarn properties such as poor bulk, stability, lo…
The structure of GGT [EC 2.3.2.2] from E. coli K-12 was studied at 3 A resolution by X-ray crystallography. Initial protein phases were calculated using two kinds of Pb2+ derivatives. The phases were refined by non-crystallographic 2-fold symmetry electron density averaging combined with solvent flattening and histogr…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation T. S. Creasy, S. G. Advani, R. K. Okine; Transient rheological behavior of a long discontinuous f…
Abstract— The mechanism of “475°C embrittlement” of a duplex stainless steel was investigated using finite element modelling of the stress distribution at brittle fracture initiation. Brittle fracture initiated at a critical shear stress, which increased with ferrite hardness. The fracture stress was affected by the d…
Abstract The local order around the yttrium atoms in a series of samples belonging to the Y 2 O 3 −Al 2 O 3 system have been characterised by X‐ray absorption at the yttrium K‐edge. Three types of Y‐O bonds were found in the first coordination shell for samples rich in Y 2 O 3 . The garnet‐like aluminates have been el…
Abstract— The mechanism of “475°C embrittlement” in age‐hardened ferritic stainless steel, E‐Brite and A129‐4, is investigated. Experimental results for smooth tensile and notched bending fracture tests are interpreted using a finite element simulation of the stresses at fracture. Yield is characterised by profuse sli…
Raman scattering measurements and lattice dynamics calculations are reported for the cyclosilicate mineral wadeite ${\mathrm{K}}_{2}$${\mathrm{ZrSi}}_{3}$${\mathrm{O}}_{9}$. The structure of this crystal (space group P6\ifmmode\bar\else\textasciimacron\fi{} or ${\mathit{C}}_{3\mathit{h}}^{1}$) consists of planar three…
‘Reverse’ or ‘polymer ball’ polymer dispersed liquid crystal (PDLC) samples were prepared by a photopolymerization induced phase separation method. A detailed study of the effects of the sample preparation parameters, such as curing time, curing intensity, and liquid crystal concentration are reported. It was found th…