Materials Literature
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In this review paper, research on solute redistribution coefficients for equilibrium, near equilibrium and non-equilibrium solidification processes were first analyzed. Then, different models advanced since the 1950s for solute redistribution during the directional solidification process with a planar interface were s…
An extended Rayleigh model for laser generated bubbles in water and soft tissue is presented. This model includes surface tension, viscosity, a realistic equation of state, material strength and failure, stress wave emission, and linear growth of interface instabilities. The model is validated by comparison to detaile…
Many elements in concrete can become activated by neutrons in a cyclotron vault, but only a few of the activation products are long-lived. The most prominent of these are Eu-152, Eu-154, Co-60, and Cs-134 which build up over time from (n, γ) reactions in trace amounts of stable Europium, Cobalt, and Cesium that are no…
Transport of permanent gases (N 2 , O 2 , CO 2 ) and of saturated organic vapours of benzene, toluene and methanol through membranes based on poly(ethylene adipate)-crosslinked poly(amide-imide)s was studied. The membranes containing more than 50 wt.% of non-polyimides showed higher permeability coefficients (by 2-3 o…
Polycrystalline magnesium generally fractures intergranuarly under dynamic loading, and exhibits limited ductility owing to its HCP structure. In this study, improvement of tensile mechanical properties under dynamic loading has been demonstrated for a commercial magnesium alloy of AZ31. A commercial AZ31 alloy was su…
Chemical Synthesis and Electrochemical Properties of Poly(cyano-substituted-diheteroareneethylene) as Conducting Polymers for Electrochemical Supercapacitors , Soudan, Patrick, Ho, Hoang Anh, Breau, Livain, Belanger, Daniel
A new electrode based on (30:70 mol %) composition has been prepared by thermal decomposition (400°C) from mixtures of chloride precursors and characterized by energy dispersive X-ray, scanning electron microscopy, X-ray diffraction analysis, cyclic voltammetry, and charging/discharging curves. The electrochemical beh…
End groups after the thermal degradation of poly(ethylene terephthalate) (PET) and its cyclohexanedimethanol (CHDM) copolymer were characterized with 1H NMR. Thermally degraded polymers were obtained by heat treatment at 290 °C. For the PET homopolymer, a vinyl end group appeared, which resulted from thermal cis-β-eli…
Conventional and sterically stabilized liposomes derived from phosphatidylcholine or the antitumor agents, hexadecylphosphocholine and octadecyl-(1,1-dimethyl-4-piperidino-4-yl)-phosphate, as bilayer forming constituents, containing bleomycin, were developed and tested. Liposomal encapsulation of bleomycin enhanced st…
Research Article| March 01, 2001 Inherited correlation in crystal size distribution Yucheng Pan Yucheng Pan 1Department of Geology and Geophysics, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii 96822, USA Search for other works by this author on: GSW Google Scholar Author and…
Atomistic simulation techniques have been used to model the dissociative adsorption of water onto the (100), (101) and (110) surfaces of tetragonal zirconia. A number of partial coverages up to a full monolayer have been investigated. Results show that hydroxylation energies depend greatly on the surface in question,…
The low-frequency dielectric susceptibility of layered CuInP2(SexS1−x)6 mixed crystals is investigated. The morphotropic phase boundary is found between x = 0.75 and 0.8. Broadening of phase transition anomalies in CuInP2S6 is observed at substitution of sulfur atoms by selenium. At substitution of selenium by sulfur…
The graft polymerizations of stearyl methacrylate (SMA) and divinylbenzene (DVB) onto natural rubber (NR) were carried out in a solution process using benzoyl peroxide (BPO) as an initiator in toluene or chloroform. The main products of the grafted NR include an uncrosslinked (sol) part [sol(SMA–NR–DVB): s-SNRD] and a…
An impact fracture test method has been developed to measure fracture toughness under mixed mode I/II loading using an edge-cracked half-disk specimen. Using this method, dynamic and quasi-static tests were performed and mixed-mode fracture toughness for graphite was measured. The results were compared with those that…
ZrO2 films were deposited on low carbon steel by a sol-gel process as a chemical pretreatment before the application of a polyester paint. The films were obtained by a dip-coating technique using solutions of Zr(OBun)4 containing complexing agents (acetylacetone or acetic acid). These additives modified the alkoxide a…
Scratch resistance of sodium borosilicate glasses (20Na2O⋅80(1-x)SiO2⋅40xB2O3 x=0, 0.2, 0.4, 0.6, 0.8, 1) was investigated by using a Knoop indenter. In addition, Vickers hardness, Young's modulus, and fracture toughness were measured and their compositional variations were compared. It was found that the scratch hard…
La 1-x Sr x MnO 3 is a manganese oxide with a perovskite-type structure, LaMnO 3 , by substitution of La 3+ sites with Sr 2 which shows a variety of phenomena with changing hole concentration (x). The total hemispherical emittance, e H , of La 1-x Sr x MnO 3 (x=0, 0.175, and 0.3) in the vicinity of the metal insulator…
A study was made of the electron paramagnetic resonance (EPR) in electrolytically and chemically prepared manganese dioxides intended for use in power sources. A typical EPR signal for the powdered samples is wide single line with The replacement of some ions by modified the character of the exchange interaction. A co…
This paper proposes an integral equation to describe the stochastic fluctuation of partial discharge (PD) occurrence under sinusoidal waveform voltage conditions based on a simple PD model (an equivalent circuit model). The stochastic behavior of PD fluctuation is assumed to arise from the fluctuation of PD delay time…
A simple thermo-mechanical model is applied to evaluate the influence of the nonuniformity of ZnO varistor disks used in surge arresters on their energy handling capability. Puncture is the dominating failure mode for slightly nonuniform disks, but cracking becomes more likely as the degree of nonuniformities increase…