Materials Literature
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X-ray photoelectron spectroscopic (XPS) studies of inP surfaces subjected to a new method of hydrogen plasma treatment are reported here. The XPS analysis shows that the usually observed phosphorus loss can be reduced by the use of a 'sacrificial' inP immersed in the hydrogen plasmawith the test InP Sample kept away f…
Self-diffusion along the [112] Shockley parital dislocation pair (self-pipe-diffusion) in Au is studied with Nos\'e-Hoover molecular dynamics (MD) using the many-atom Ackland-Tichy-Vitek-Finnis model. We find the following formation energy difference between interstitials (i) and vacancies (v) at partial dislocations:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Reinvestigation of the Thermal Decomposition of Methylammonium NitrateWaspada Kurniadi and K. R. BrowerCite this: J. Org. Chem. 1994, 59, 18, 5502–5505Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 September 1994…
The paper describes work being done in the modelling of transformers, concentrating on predicting the effects of the stray magnetic field as it relates to transient and non-sinusoidal conditions, with particular reference to traction, rectifier and other applications. Considerable progress has been made with steady-st…
The electromagnetic duality principle is used for transformer modelling. The proposed method is presented. The calculation complexity of the rectangular winding parameters is reduced using a conformal mapping method and the boundary element method. The model parameters are directly calculated from the physical geometr…
The orthorhombic - monoclinic phase transition at Tc=277. 1K in [N(CH3)4]2MnBr4 crystals have been studied by measuring dielectric constant along the a, b, and c-axes in the wide range of temperature from 350K to 10K. The anomalous parts of the dielectric constants due to the phase transition are found to show very an…
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 A. D. Gotsis, H. C. Langelaan; Origins of nonlinear pressure profiles in the flow of nematic melt…
LARCTM-TPI is a linear aromatic polyimide that was developed at NASA Langley Research Center in the 1970's and subsequently licensed to Mitsui Toatsu Chemicals, Inc., (MTC) in Japan. This company has made it easier to process for use in application as a structural adhesive or as a composite matrix resin. The present f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnergy Transfer from Metastable NF to Boron HydrideD. J. Benard, E. Boehmer, H. H. Michels, and J. A. Montgomery Jr.Cite this: J. Phys. Chem. 1994, 98, 36, 8952–8958Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 Se…
The high specific conductivity of graphite fiber/copper matrix (Gr/Cu) composites offers great potential for high heat flux structures operating at elevated temperatures. To determine the feasibility of applying Gr/Cu composites to high heat flux structures, composite plates were fabricated using unidirectional and cr…
By using dielectric relaxation spectroscopy it has been observed that while the molecular reorientation around the long axis in the smectic B-crystal phase is active, the rotation around the short axis is frozen. Thus we show that the molecular dynamics of the liquid crystal phase designated as smectic B-crystal is in…
Abstract Stress‐relaxation behavior is studied in polypropylene samples subjected to different cyclic preloadings and to simple tension. The relaxation tests are performed under different sets of strain amplitude, number of cycles, and strain rate, using a closed‐loop, electrohydraulic, servocontrolled testing machine…
The growth of crack-free 3-inch-diameter lithium tetraborate ( Li 2 B 4 O 7 ) single crystals by the Czochralski method has been studied. The relationships between crystal cracking rate during growth and the crystal rotation rate and the position of the work-coil have been examined. It is concluded that crystal cracki…
The influence of miscibility of an acrylic PSA and several tackifier resin systems upon PSA performance was investigated. When the acrylic copolymer and the resins were blended in various proportions, three types of mixing state were found: miscible system, partially miscible system and immiscible system. In the case…
The crystal structure of a new compound Li 2 Mg 2 (WO 4 ) 3 has been determined by means of X-ray powder diffraction. Li 2 Mg 2 (WO 4 ) 3 belongs to the orthorhombic system, with space group Pnma and the lattice parameters are: a = 5.1129 Å, b = 10.462 A, and c = 17.612 Å at room.temperature. Its measured density is D…
Abstract The easily accessible, water soluble, conjugated polymer poly(4‐bromopyridine), has been synthesised by the self‐condensation of 4‐bromopyridine at various temperatures and also in the presence of methyl iodide. The structure of the material is complex with a variety of sub‐units; possible structures are disc…
Measurements of the rate of crack growth in alloy 600 (UNS N06600) in high-temperature lithiated hydrogenated water were performed at various potentials and pH levels. The mode of cracking was found to be dependent on temperature and pH of the solution. The lowest crack growth rate occurred from pH 6 to 7. Intergranul…
In this paper the scalar quasi-static magnetic hysteresis is described by means of a new model based on a sequential algorithm, which appears to he a possible alternative to the classical Preisach model. A procedure leading to the identification of the model parameters is described. The hysteretic behavior obtained by…
Abstract The electrical and optical properties of 1,4‐ cis ‐polyisoprene before and after doping with SnCl 4 and SbCl 5 were investigated. The material becomes reddish brown and black upon doping with SnCl 4 and SbCl 5 , respectively, and the conductivity increases by about 11 orders of magnitude. The optical absorpti…
Abstract This article deals with the microlevel structure of the electronically conductive polymer, polyaniline, on the basis of the conducting islands model of Epstein et al. The paper presents, for the first time, TEM pictures of the microlevel structure of heavily doped polyaniline, possibly showing the conducting…