Materials Literature
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The title ligand and a C-functionalised analogue have been prepared; the ligand is very strongly basic [pKa LH+, LH2+ < 14 (298 K)] and forms remarkably stable complexes with yttrium and calcium.
Abstract
The changes induced in some titania-supported iron–ruthenium and iron–iridium catalysts following pretreatment in hydrogen have been examined in situ by 57Fe Mössbauer spectroscopy. Fe3+, which is formed in the supported metallic phase by initial treatment in air, undergoes partial reduction when treated in hydrogen a…
Abstract Elastic filaments have been produced by melt spinning poly(tetramethylene terephthalate)/poly(tetramethylene ether glycol)‐terephthalate (PTMT/PTMEG‐T) copolymers of various hard segment contents (HSC). Some of these copolymers are difficult to spin because of their elastic nature and sluggish crystallization…
The occurrence of a bloom of the diatom Asterionella glacialis (Castracane) was recorded in the Rushikulya Estuary (Orissa), East Coast of India for a period of about 5 weeks during April-May 1988. Phytoplankton cell counts during this period ranged from 3.98-9.42 x 10 super(4) cells 1/1 in which A. glacialis alone co…
Macrophages, one of the immunologically competent cells centrally contributing to host defense mechanisms, can be stimulated by a variety of immunomodulatory agents to exert antitumor activity. However, many problems, such as serious side effects attributed to the high-dosage regimens of the drugs, should be addressed…
The influence of sub-T/sub g/ (the glass transition temperature) physical aging processes on the electrical properties of amorphous polymethylmethacrylate (PMMA) and polydiancarbonate was investigated by means of the thermally stimulated depolarization currents, isothermal transient charging currents, and AC low-frequ…
The enhanced luminescence of the Eu-dibenzoylmethane(DBM)-NH3 system in the presence of Tb3+ and the effect of solvents on that system in the absence of Tb3+ were studied. The optimum conditions for co-luminescence of the Eu-Tb-DBM-NH3 system were examined. The optimised procedure was applied to the determination of t…
A method is presented to establish a multisection network model for study of high-frequency transient behavior of transformer and machine windings. The parameters of the network model are estimated using the maximum-likelihood estimation technique. In order to verify the proposed estimation method, the parameters of a…
The Bi 2 O 3 ‐rich side of the system Bi 2 O 3 ‐SiO 2 was studied with powder X‐ray diffraction and differential thermal analysis. In the composition 6Bi 2 O 3 . x SiO 2 , the metastable γ phase (bcc) was observed to exist over the range of 0 < x ≤ 1. In most of the compositions studied, metastable phases of water‐que…
Abstract A series of natural rubber vulcanizates containing varied amounts of sulfur and an accelerator (N‐cyclohexyl‐2‐benzothiazyl sulfenamide, CBS) were prepared and their resistance to attack by a strain of Nocardia , capable of utilizing natural rubber as carbon substrate, was examined. The higher the content of…
This paper discribes the development of Functionally Gradient Material (FGM) which is promoted by Science and Technology Agency with "special coordination funds for promoting science and. technology" from 1987. FGM is an advanced metal/ceramic compositional gradient from a metal side to a ceramic side to obtain the fu…
Surface Barkhausen noise (SBN) measurements were made on a 2% Mn pipeline steel sample subjected to different levels of applied tensile and compressive isostress. The magnetic field direction was varied through a full 360 degrees . SBN voltage was found to depend on both stress level and magnetic field direction. The…
The soft magnetic properties of sputtered (0 approximately 3-wt%) Si-Fe alloy thin films fabricated in (Ar+N/sub 2/) plasma were investigated in connection with metallurgical structure. 2.7-wt% Si-Fe film annealed at 400 degrees C shows a high effective permeability mu /sub eff/ of about 1600 at 5 MHz. It has been obs…
Electrochemical methods are extremely useful for the study of aqueous corrosion phenomena, particularly when utilized in conjunction with other techniques. Basic electrochemical principles are reviewed and examples given of application of a variety of electrochemical techniques to corrosion. Standards of ASTM Subcommi…
Abstract This article presents the following characteristics of pure metals : structure, chemical composition, mass characteristics, thermal properties, electrical properties, chemical properties, magnetic properties, optical properties, fabrication characteristics, nuclear properties, and mechanical properties.
All articles of this category The reaction of hexasodium benzenehexathiolate (1) and benzenehexathiol (7) with carbon disulfide is studied. Depending on the reaction conditions and the molar ratio of 1 or 7 to carbon disulfide the 1,3-benzodithiole-2-thiones 6 , the 2,6-dithioxobenzo[1,2- d : 4,5-d′]- 5 , the 2,5-dith…
Refined silk fibroin obtained from waste cocoons was dissolved in a mixture of ethanol and neutral salt (calcium chloride) solution and the solution thus obtained was centrifuged and then acidified with an organic acid after dialysis. The pH of the resulting solution was in the acid side of the isoelectric point (pl=3…
For pt.I see ibid., vol.25, 1029-1036, 1990. The purpose of this work is to verify the validity of the new degradation model and the transformation equations which have been developed on the basis of thermokinetic considerations. This verification is implemented by comparing the temperature index (TI) values obtained…
We describe the theory, design, and performance of a new surface-plasmon-polariton-(SPP) assisted Raman scattering instrument that exploits the Kretschmann geometry. In contrast to previous methods, our device allows the entire SPP emission cone to be collected, thus optimizing the detected Raman intensity. This advan…