Materials Literature
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The article, which discusses the procurement and specification of fiber-reinforced plastic (FRP) and the lack of applicable standards, specifications, methods of testing, and criteria, considers how composite products were developed for military applications, how they are manufactured for civilian purposes, and the av…
Abstract Overbased calcium sulphonate and its derivatives have been characterised by means of thermogravimetric analysis, X‐ray and IR spectroscopy. The study was carried out after thermal treatment up to 900°C. Different phases appeared, showing a transition from an amorphous system to a crystallised medium. Electric…
The orbital contribution to the $^{13}\mathrm{C}$ NMR shift is rigorously calculated in the first and second stages of graphite intercalation compounds for a magnetic field perpendicular to the layers. The Kobayashi-Tsukada formalism is applied in the independent-subsystem model, which offers an opportunity to allow a…
Measurements of density and apparent thermal conductivity are pre sented for specimens cut from rigid polyisocyanurate (PIR) foam co-blown with trichlorofluoromethane (CCl 3 F) and carbon dioxide (CO 2 ) Eight specimens, nominally 580 by 580 by 27 mm, were prepared from two boards (1.2 by 2.4 m by 50 mm) of foam lamin…
Simulations were carried out for thermodynamic activities of water and nitric acid in simulated reprocessing solutions under a high level liquid waste (HLLW) evaporation condition. A prediction method based on a “Hydration Model” was developed to evaluate the activity coefficients of nitric acid and water in nitric ac…
The reaction of metal chloride-GIC with ammonia has been examined from the kinetic, thermodynamic and structural points of view. This reaction, which is widely reversible between two values of the ammonia/metal chloride ratio, can be used for the chemical storage of thermal energy or cold generation. The reaction rate…
The quasi‐static, stable growth of cracks in polycrystalline magnesia under various loading conditions (cyclic compression, monotonic tension, and tension–compression fatigue) was studied. Crack length was monitored continuously through a conductive film attached to the specimen surface. The fracture surfaces and the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew skeletally stabilized silazanes and siloxazanesTimothy R. Prout, Martin L. Thompson, R. Curtis Haltiwanger, Riley Schaeffer, and Arlan D. NormanCite this: Inorg. Chem. 1994, 33, 9, 1778–1782Publication Date (Print):April 1, 1994Publication History Published online1 May 2…
X-ray photoelectron spectroscopy was used for characterizing pumice: it is a natural aluminosilicate with a high percentage of silica (~70%), a low surface area (~5 m2 g−1 as determined by the BET method) and a density of 2.3 g cm−3. It has a fine, porous physical structure which makes the material easy to machine and…
Three-dimensional segregation maps were obtained by serially sectioning rolled billets of high carbon steel. The sections were macroetched to reveal phosphorus segregation then digitised and combined using a computer. Volume rendering software was used to create images that represented views of continuously cast bloom…
The performance factors which will influence the market acceptance of electrochromic windows are reviewed. A set of data representing the optical properties of existing and foreseeable electrochromic window devices was generated. The issue of reflective versus absorbing electrochromics was explored. This data was used…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonte Carlo simulations of Mg(Al)O solid solutions based on crystal chemical rulesC. Lane Rohrer and Gregory S. RohrerCite this: Chem. Mater. 1994, 6, 4, 501–507Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 April 1994…
The low-temperature phase and melting of a dilute, binary, two-dimensional array of colloidal particles with dipolar interactions are studied. The system consists of a 1% concentration of larger particles in an otherwise monodispersed array of polymer spheres confined between two glass plates. The translational and bo…
Initiation of the reaction between Na 3E (E = As, Sb, Bi) and anhydrous metal halides at 25 to 550 °C produces metal arsenides M x As y (M=Y,La, Ti, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Pt ,Cu and Zn) and antimonides M x Sb y (M=Ti, V, Nb, Ta, Cr, Fe, Co, Ni, Pt, Cu and Zn) via an exothermic selfpropagating react…
A new class of silicone matrix-based composites has been developed, particularly for use in the thermal protection of missile launch structures. In this application. screening tests have shown that these materials, coded SM8000, offer three-fold performance improvement over conventional phenolic-based composites. Init…
An electroplating process has been employed to grow high‐quality thin films of copper on tin oxide transparent semiconductor with excellent adhesion. It is shown that electrolysis reduction as a surface modification process prior to the electrodeposition is essential for good adhesion of the resulting copper coating.…
Soil solid phase and soil solution characteristics were evaluated on surface and subsoil horizons of 60 acid, highly weathered soils in the unamended state, and on a subset of 39 surface horizons following the addition of CaSO4.2H2O. The activity of Al3+ Was found to be strongly correlated with the soil solution pH, w…
Degradation of ethylene vinyl acetate copolymer (EVA; 28% VA content), low density polyethylene (LDPE) and their blends has been studied through thermogravimetric analysis (TGA/DTG). Pure EVA and its blends show a two stage decomposition, where the first stage is ascribed to the acetic acid elimination, i.e., the weig…
HVDC converter station operations generate radio frequency (RF) electromagnetic (EM) noise which could interfere with adjacent communication and computer equipment, and carrier system operations. A generic Radio Frequency Computer Analysis Program (RAFCAP) for calculating the EM noise generated by valve ignition of a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman Characterization of Iron(III) Porphyrin N-Oxide: Evidence for an Fe-O-N Bridged StructureYasuhisa Mizutani, Yoshihito Watanabe, and Teizo KitagawaCite this: J. Am. Chem. Soc. 1994, 116, 8, 3439–3441Publication Date (Print):April 1, 1994Publication History Pub…