Materials Literature
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Most actinide nuclides decay by {alpha} emission with the formation of kinetically and electronically excited daughters. The behaviour of heavy recoil atoms can be inferred from the observation of rupture of equilibrium in the natural radioactive series, from hot atom chemistry and from computer simulation of collisio…
Contrary to previous reports sapphyrin does react with uranyl cation to give a stable complex, which is no longer aromatic, having undergone attack by methoxide to give a new neutral complex; the synthesis, characterisation and X-ray structure of the new compound are described.
Glycosides are the bioactive components of many famous Chinese medicines. Here reported are some bioactive glycosides we discovered from Chinese medicines in recent years. (1) Phenolic glycosides from Chinese medicines: Gastrodia elata, Aconitum austroyunanense and Helicia erratica, three bioactive phenolic glycosides…
Differential scanning calorimetry has been used to investigate the melting behaviour of mixtures of poly(ethylene oxide) and deuterium oxide. The phase diagram shows that a eutectic mixture is formed with a weight fraction of D2O of 0.57 and a melting point of 264 K. A change in the curvature of the polymer liquidus c…
シリカ,アルミナ,シリカ・アルミナの粉体ディスクを773～1773Kで大気中焼成し,それらの表面のXPS分析を行った.Si2p,Al2p及びO1sの束縛エネルギーはすべて表面組成に依存して連続的に変化した.同表面上の不純物ナトリウムも同様の挙動を示した.焼成温度が高いほどスペクトルの半値幅が小さくなった理由は結晶子径のサイズ効果に帰せられた.又,結晶化に伴って不純物元素の表面濃集,すなわち不純物の表面偏析が観測された.アルミナを例に,シリコンとナトリウムの表面偏析と固体酸性,塩基性及び触媒反応活性との間に見いだされた相関性を示す.
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…