Materials Literature
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The reaction of Me(hexynyl)CuLi with (Me3Si)2 NCH2-CC-CO2Et followed by treatment with a diacid dichloride gave a facile access to meta-dipyrrolyl benzene or 2,6-dipyrrolyl pyridine derivatives, which were cyclised to tetrapyrrolic macrocycles 7 and 9; further reactions with Pd(acac)2 or Ni(acac)2 led to bimetallic co…
Solution annealed type 316L austenitic stainless steels modified with IV or V group elements were electron irradiated up to a dose of 10.8 dpa at temperatures of 623 to 843 K in an HVEM. X-ray diffraction analysis was also performed to determine the quantitative size factors of the additional elements in the 316L stee…
3,3′,5,5′-Tetra-tert-butyl-p-terphenoquinone 5, the first terphenoquinone, has been obtained as metallic blue–green crystals showing anisotropic semiconductivity; the crystal structure of 5 shows that the nearly-planar molecules form slipped stacks along the needle axis.
Notch sensitivity has been connected with the presence of a film-like s-phase morphology in the grain boundaries of cast test bars of Alloy 718 of a problem material in which premature fracture occurred during testing of smooth stress rupture bars at 650 "C. A heat treatment designed to produce a plate-like S-phase mo…
The time and frequency response of current and potential transformers (CTs and PTs) operating under fundamental frequency conditions are well known. However, in the presence of harmonic frequencies, these transformers can exhibit significant errors. The authors present CT and PT comprehensive frequency domain equivale…
An analysis using the Cambridge Database of 926 structures in the short-axis range up to 8.0 Å, containing divalent sulphur, Y—S—Z, shows that 77 have short axes less than 4.5 Å and are distinguished by a strongly directional pattern of sulphur–heteroatom interactions.
A true “low-activation” material should ideally achieve all of the following objectives: The possible prompt dose at the site boundary from 100% release of the inventory should be <2 Sv (200 rem); hence, the design would be “inherently safe” in that no possible accident could result in prompt radiation fatalities.The…
In the design of a shape memory alloy helical spring, a basic method of designing the spring based on the stress-strain-temperature relation of the material is an important problem to be solved. In the current study, the deformation behavior of the shape memory alloy helical spring was analyzed based on stress-strain-…
The phase transition in metastable phases of vanadium dioxide, from VO2(B) to VO2(A), has been investigated. The transition to VO2(A) was induced mechanochemically by compressing or grinding VO2(B) powders and subsequent heat treatment. In non-stressed samples, the transition proceeded slowly with prolonged heat treat…
A comparison is made on the dielectric properties of the ferroelectric perovskite bismuth titanate for both crystalline (along different directions) and polycrystalline (with and without flux) samples, using the complex ac impedance technique. Results for the impedance, conductivity activation energies, bulk dielectri…
Wicking flow of water is examined in composite networks of cellulose and carboxymethyl cellulose (CMC) fibers. The rate of advance of water through paper strips and fluff pads of varying composition is reported, while dynamic electrotensiometry is used to measure the wetting and swelling characteristics of the individ…
Theoretical and experimental analyses are presented of the electromagnetic transient following the out-of-phase synchronization of a three-phase five-limb step-up transformer; this means an abnormal condition where the angle between phasors representing the generated voltages and those representing the power network v…
This paper will summarize the strengthening and toughening behaviors of α+β and β alloys at room temperature. In addition, some considerations on the strengthening capacity and some relationships between microstructures and mechanical properties will be presented.The strength of α+β alloys can be improved by increasin…
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Copper and silver test specimens were subjected to indoor exposure tests carried out at 23 sites in Tokyo, Bandung, Singapore, and Bangkok. At the same time, the deposition rates of , , , , and particles which had deposited on the sampling devices were measured. Corroded specimen surfaces were examined by electron pro…
The thermal decomposition of cobalt acetate tetrahydrate has been studied using time-resolved powder neutron diffraction. By using selectively deuterated samples, the loss of water or the breakdown of the acetate group can be identified by following the decrease in the incoherent background of the diffraction pattern…
Some ferrospinels act as catalysts for the decomposition of H 2 O 2 , their effectiveness is dependent on the composition of the catalyst. This study is to find the most effective catalyst of stoichiometry M II Fe 2 III O 4 . A set of ferrites of different composition M II Fe 2 II 0 4 (M II = Mn, Co, Ni, Cu, Zn, Cd) w…
A new high-temperature solid phase of tetramethylammonium thiocyanate has been found above the phase transition at 455 K, where a large entropy change (15 J K–1 mol–1) was observed. X-ray powder patterns recorded at ca. 470 K showed that this phase forms a CsCl-type cubic lattice with aO= 600 pm, indicating that the S…
The accurate measurement of the losses of a 5.5 kW induction motor using a calorimetric method is described. Operating the calorimeter in a balance or ‘null’ mode, the losses can be reliably measured to worst case accuracies of 1.45% on full load. Examples of measured losses are given.
The bondings in two limiting types of spherical gold clusters are considered in this paper. Close-packed spherical gold clusters form molecular orbitals that can be analyzed by using the jellium model. Closed shells correspond to the Tilling of the following wave functions: 1s, 1p, 1d, 2s, 1f, 2p, 1g, etc., which have…