Materials Literature
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Dynamic strain aging (DSA) phenomenon is a strengthening phenomenon in metals and alloys, caused by the interaction between the diffusive solute atoms and the moving dislocation. This interaction produces series strengthening effects and leads to some evident changes of the mechanical behavior of metals and alloys und…
It was reported in our previous papers that the disproportionation reaction of the Sm2Fe17 compound in hydrogen can be used to prepare fine, soft-magnetic powders for use in electromagnetic wave absorbers. In this study, the microstructure and electromagnetic wave absorption properties in the GHz frequency range of Sm…
FORENSIC EXAMINATION OF FIBRES Edited by James Robertson and Michael Grieve Taylor & Francis, London, 1999, 2nd Edition, hardback, 447pp; RRP $; ISBN 0-7484-0816-9.
A novel mercury iodide adduct [HgI2(4,4′-azpy)]n (4,4′-azpy⊕=⊕4,4′-azopyridine) was synthesized in THF. Single crystal X-ray diffraction analysis shows that it exhibits a zigzag chain structure with distorted tetrahedral Hg centers. Its optical response to incident light shows considerable optical absorptive activity…
The type specimens of Perenniporia contraria and of its presumed taxonomic synonym, Fomes subannosus, have been revisited. In addition, some recent collections identified as P. contraria have been re-examined, demonstrating that the present concept of the latter taxon is confused. The species is illustrated and its co…
For years, theories for Raman scattering have been confined to either the insulating or fully metallic state. While much can be learned by focusing attention on the metal or insulator, recent experimental work on the cuprate systems points to the desirability of formulating a theory for Raman response which takes one…
Three ethylene vinyl acetate (EVA) copolymers with different vinyl acetate (VA) contents (28-40 wt%) were mixed with rosin ester and polyterpene resin tackifiers in a 1 : 1 (weight/weight) ratio. The rheological and thermal properties of the tackifiers were determined and the use of rheological measurements as a preci…
Acrylic copolymers are now well known in conservation practice. Based upon relative stability and reversibility, Paraloid B-72 has found a particularly wide range of uses as a coating, consolidant, and adhesive. Increasingly, B-72 is being used as an adhesive for reassembly of large stone sculpture. It has also found…
This paper is an attempt to examine the commercial signficance of an agro-waste “Pineapple Leaf Fibre” (PALF) which is rich in cellulose, relatively inexpensive and has the potential for polymer reinforcement. The quality enhancement of PALF has been tried through different surface modifications like dewaxing, alkali…
A new type of corrosion sensor was successfully applied for the monitoring of the atmospheric corrosion rate of steels. The sensor consisted of a steel ring and a pin located concentrically with a narrow gap of plastic insulator. Both high frequency (10 kHz) and low frequency (10 mHz) AC impedance data were retrieved…
Abstract Oxidation of cellulose, caused by metal-catalyzed hydrogen peroxide decomposition, is one of the main potential reactions that can occur during the alkaline peroxide bleaching of pulp. This oxidation decreases the individual fiber strength and thus the sheet strength. The bleaching reaction should be controll…
Abstract Effect of lipase on removal of lard from a cotton fabric by detergency was studied in detail by radioisotope and X‐ray microanalysis over 60‐min washing. Osmium tetroxide was used to label the soil for microscopy. Backscattred electron images were used to study residual soil present on and within the cotton f…
ペルフルオロ(ω-ビニルオキシ-1-アルケン)(CF2=CF–O–(CF2)x–CF=CF2) (x = 1，2)をラジカル環化重合することで非晶質なペルフルオロ透明樹脂が得られる．その樹脂は光学的に透明で溶媒に可溶であり，既存の商業生産されているフッ素樹脂の特徴，すなわち傑出した耐熱性，薬品耐性や低屈折率，低誘電率を兼ね備えている．とくにペルフルオロ(4-ビニルオキシ-1-ブテン) (x = 2)からなるポリマーはガラス転移点が高く，先端的電子 · 光学向け材料として有用である．重合挙動は一般のラジカル重合と同様であり，環化は五員環の生成が優先する．末端基のフッ素化により波長200 nmから1500 nmにおいて現在知られている…
Two systems were studied on high-resolution neutron time-of-flight powder diffraction (HRDP), a totally B-site disordered ceramic disk of Pb2ScNbO6, and a partially ordered ceramic block of Pb2ScTaO6. We found Pb2ScNbO6 to be fully disordered, space group Pm3m with lattice constant 4.08153(1)Å, whereas Pb2ScTaO6 was f…
Novel graphitic spheres with a shell structure of curved graphene layers were discovered as a side product of fullerene synthesis. The Raman spectra of these carbon spheres with typical sizes of 20–500 μm have been found to be similar to that of micro-crystalline graphite. The silent low-frequency B1g(1) phonon of gra…
This paper provides the failure analysis of a three-phase, dry-type, silicone resin vacuum-pressure encapsulated, 750/1000 kVA, AA/FA, 34.5 kV-480 Y/277-V, delta-wye power transformer. Transient overvoltage switching surge propagation through the transformer winding and protection margin is discussed. An arbitrary sen…
Chitosan's linear structure, cationic charge and high molecular weight can help it improve dermatological compatibility and feel of formulations, give limited antimicrobial properties. and offer advantages over synthetic haircare polymers.
In a previous work (Trchounian et al., Biol. Membrany 16:416-428 (1999) (in Russian)) we reported the interrelations between production of H2 and H+-K+ exchange in fermenting Escherichia coli grown under anaerobic conditions at pH 7.5. The ion fluxes had stable stoichiometry 2H+/K+ and were N,N'-dicyclohexylcarbodiimi…
The crystal structure of (OMTTF)2[Ni(tdas)2] (OMTTF = octamethylenetetrathiafulvalene and tdas = 1,2,5-thiadiazole-3,4-dithiolate) was solved as the second example of an M(tdas)2 (M = transition metal) complex with TTF derivatives. The structure consists of a dimer of the radical cation of the OMTTF molecules and the…
The copper coordination geometry in the blue copper proteins plastocyanin, nitrite reductase, cucumber basic protein, and azurin has been studied by combined density functional (B3LYP) and molecular mechanical methods.Compared to quantum chemical vacuum calculations, a significant improvement of the geometry is seen (…