Materials Literature
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Development and Validation of a Mathematical Model for the Chemical Vapor Deposition of Silica from Mixtures of Chlorosilanes, Carbon Dioxide, and Hydrogen , Nitodas, Stephanos F., Sotirchos, Stratis V.
The correlation between subsize and full-size Charpy impact properties of reactor pressure vessel steels have been investigated using 1/3 and 1/4 subsize specimens cut from the broken halves of full-size specimens irradiated to 2.7 × 1023 n m-2 (E>lMeV) at 288 °C. We found that ductile-to-brittle transition tem…
Much work over the last 10 years has focused on composites that exhibit a change in composition and structure over a nanometer length scale. Layered silicates like montmorillonite(MMT) dispersed as a reinforcing phase in a polymer matrix are one of the most important forms of such organic inorganic nanocomposites to a…
Previous work has shown that lithium mica glass-ceramics were excellent potential candidates as dental ceramics. The purpose of this study was to evaluate the effect of various additives on the microstructure and thermal properties of a mica glass-ceramic in the system Li(2)O-K(2)O-SiO(2)-MgO-F. Five glass composition…
The interfacial shear strengths (ISSs) of a series of 2D Hi-Nicalon/SiC composites with various pyrolitic carbon (PyC) or PyC-SiC multiple fiber/matrix interlayers were investigated using the single fiber pushout tests. The influence of the obtained ISS on the proportional limit stress (PLS) of the materials upon bend…
Using seed crystal method, whole-urine method, and scanning electron microscopy, the inhibitory effects of sialic acid and osteopontin (OPN) on aggregation/growth of CaOx crystals were investigated. Using the seed crystal method, sialic acid showed an inhibitory effect on CaOx crystal aggregation/growth in a concentra…
断続的に排出される製鉄用転炉排熱は1500°C以上の高温であるが未回収である．この熱回収のために高温用メッシュ型PCMの開発を試み，そのシステム特性を考察した．そこでは主にPCM被覆法に関し実験的に検討し，熱物質収支に基づきシステム評価した．電気化学的な手法で異なる金属をメッシュ状PCM（銅，融点1,356K）に異なる膜厚で被覆し，1,473Kに加熱することにより耐熱実験を行った．その結果CrとNiの2重被覆型PCMが有望であることが判明した．このPCMを使用して転炉廃熱を回収しコークス炉ガスを原料としてメタノ-ル合成した場合，既存の方法に比べて25%のエクセルギー消費量で製造できる可能性を示唆した．
An accurate technique was implemented to measure spectral hole burning in rare-earth amplifiers at room temperature, showing that thulium-doped fiber amplifiers exhibit hole depths four times lower than those of C -band erbium-doped fiber amplifiers.
Steam generators placed in service in the 1960s and 1970s were primarily fabricated from mill-annealed Alloy 600. Over time, this material proved to be susceptible to stress corrosion cracking in the highly pure primary and secondary water chemistry environments of pressurized-water reactors. The corrosion ultimately…
A set of ceramic samples based on silicon carbide with substantially varying integral porosity (from 1 to 10 %) was studied. The pore size distribution was examined by optical microscopy (for pores ranging from 10 mm to hundreds of microns in size), scanning electron microscopy (0.5 - 10 mm), and small-angle X-ray sca…
In order to elucidate the degradation mechanism of EPDM rubber caused by a amount of chlorine in city water, EPDM rubbers containing 2 kinds of carbon black (ie. HAF and FT) were employed and corroded in chlorine water, Their morphology changes before and after degradation were observed by SEM. The effect of the amoun…
Numerical simulations are performed to investigate the characteristics of the formation of alternate and multiple bars with the use of the NHSED2D model. The results of the simulations show reasonably good agreement with the results of the theoretical analysis and the experiments. It is found that periodic boundary co…
Young's modulus, E, Vickers hardness, Hv, crack initiation load, Lc, and fracture toughness, Kc, of 30RO-10Al2O3-60SiO2, B2O3, P2O5 (mol%) (RO: MgO, CaO, SrO, BaO) system glasses were measured and the compositional dependence of deformation and fracture behaviors was systematically evaluated. Vickers hardness Hv and E…
Misturas elastoméricas condutoras de eletricidade envolvendo copolímero tribloco poli(estireno-b-butadieno-b-estireno) (SBS) e polianilina dopada com ácido dodecilbenzenosulfônico (Pani.DBSA) foram obtidas por polimerização "in situ". Os filmes obtidos por moldagem por compressão mostraram baixo limiar de percolação,…
The water-soluble tetracationic meso-tetra(4-methylpyridyl)porphine (PO2) was incorporated in mixed Langmuir monolayers (LM) with the anionic surfactant sodium hexadecylsulfate (SHS) and stearic acid (SA). The stability of the monolayer and the molecular packing of PO2 vary with the surface pressure and amount of stea…
Corrosion behavior and mechanism of Al-10% Si alloy-coated steel produced by a melt-dipping method have been investigated in methanol containing NaCl, and HCOOH as contaminants. Immersion corrosion tests were performed in deaerated or aerated methanol with and without 0.1-30% 0.1% NaCl, and 0.1% HCOOH, and ex situ sur…
A basic problem of electrochemical engineering is the calculation of the shape of an electrochemical cell necessary to apply an arbitrary current distribution on a prescribed electrode geometry. However, despite practical interest, it appears that this problem has never been addressed theoretically. In this work, a nu…
Electrical double layer and electrochemical characteristics at the nanoporous \ncarbon | (C₂H₅)₄NBF₄ +acetonitrile interface have been studied by \nthe cyclic voltammetry and impedance spectroscopy methods. The value \nof zero charge potential (0.23 V vs. SCE in H₂O), the region of ideal polarizability
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Abstract Phenol blue is a merocyanine dye that may exist in resonance between two extreme forms, a neutral keto form and a zwitterionic, charge‐separated eno form. The keto form is stable in the gas phase, while the eno form can be stabilized by solvents. In this work, the bond‐length alternation is used to monitor th…
The control of crystal size and morphology in a potassium dihydrogen phosphate batch crystallization process is investigated. The process is represented by a multidimensional population balance and related differential-algebraic equations. These equations, solved using a high resolution method, are the basis for an op…