Materials Literature
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Crystalline β‐Ta 2 O 5 coatings were deposited on hot‐isostatically‐pressed Si 3 N 4 by reacting TaCl 5 with H 2 and CO 2 in the temperature range of 1000°–1300°C and at a pressure of 660 Pa. The Ta 2 O 5 coatings generally consisted of wellcoalesced 2–3 μm grains, resulting in the formation of a nonporous coating mor…
The high-temperature radiation properties of isotactic and syndiotactic poly(methyl methacrylate) (PMMA) have been investigated by NMR spectroscopy. The tacticity changes for the isotactic PMMA during gamma-irradiation have been simulated by a model which allows for recombination of a scissioned bond and for the recom…
Thermal expansion of Y 4 A1 4 O 9 ceramics prepared at 1600° and 1800°C was measured from room temperature to 1500°C in air. Volume changes at the phase transition of Y 4 A1 2 O 9 , along with thermal hysteresis, were observed around 1400°C. The volume of the high‐temperature phase was about 0.5% lower than that of th…
The electrodeposition of copper, zinc and brass onto steel substrates from citrate-based alloy baths has been studied for a variety of bath compositions, temperatures and current densities. The influences of these variables on cathodic polarization, cathodic current efficiencies, quality of the deposits and compositio…
The sudden and unilateral decision by E. I. DuPont de Nemours & Co., Inc., to withdraw its polymers for use in implantable devices has presented the medical device industry with an immediate and serious challenge to find alternative sources of biomaterials. In France, the company Cardial S.A. has already taken steps t…
A synthesis of the physical, chemical, and mineralogical properties of soils developed on granitic rocks under different climatic conditions in Portugal was performed, including soil classification. Mean annual rainfall, the climate parameter best correlated with the variability of soil properties, was analyzed in ter…
In this paper, we describe a nondestructive method based on x‐ray reflectivity for measuring the thickness of porous silicon layers as well as the interfacial roughness between the porous silicon and the single‐crystal silicon substrate. Thickness and interfacial roughness measured using this method compare favorably…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
This paper aims to demonstrate an approach to the calculation of zero phase sequence impedance for power transformers using finite numerical methods. Specifically concentrating on 3-limb, core type, YNyn connected transformers where no accurate solution is available. An understanding of the physical factors affecting…
A brief review of quasielastic incoherent neutron scattering (QINS) experiments on superprotonic conductors is presented. The theoretical analysis of the results is discussed in terms of a number of different mechanisms for proton conduction and diffusion, notably the Grotthuss, mixed, vehicle and molecular diffusion…
The use of an aqueous electrolyte containing dissolved CO2 enabled revealing of an unusually intense photoemission from a bulk silver electrode. The observed cathodic photocurrent exhibits a sharp peak at ∼360 nm corresponding to the energy of surface plasmons in silver. The amount and the spectral distribution of the…
We present new spectroscopic data for the eclipsing, pre-main-sequence binary TY CrA. Absorption lines from the secondary and from a previously unknown tertiary are detected, including Li I 6708 Å in both stars which supports the pre-main-sequence status of the system. Radial velocities of the primary and secondary ar…
Follows a presentation at a symposium in 1993 where the authors presented an experimental investigation on a fluttering membrane for use in a wind‐tunnel. Analyses the fluttering of an object by a theoretical method. Compares the experimental results with those of the theoretical and discusses their effectiveness. Sta…
Abstract This paper presents the results of a study into the physical, chemical and mineralogical composition of two glacial sediments in Dublin, Ireland which are colloquially called Dublin ‘brown’ and ‘black boulder clays’. The objective of this study was to ascertain whether the ‘brown’ was formed through weatherin…
The aim of the finite element approach presented is to quantify the in-service elastic strains induced by variations of magnetic induction in structures made of soft ferromagnetic materials. Both strains induced by surface and body magnetic forces and pure magnetostriction strains are considered.>
The stress corrosion cracking (SCC) behavior of four austenitic Fe-32% Mn-9% Al alloys containing ≈ 1 wt% carbon was studied. All of the four alloys were susceptible to SCC in room temperature and 160°C NaCl solution. SCC was enhanced by applying an anodic potential. The crack path was transgranular, and cleavage-like…
The bulk photovoltaic effect (BPE) has been investigated in lead zirconate titanate (PZT) thin films. Measurements of the kinetics, spectral distribution and photocurrent hysteresis loops have been made. In the extrinsic spectral region, the steady-state photocurrent is primarily due to the BPE, where the photovoltaic…
Abstract The statistical theory of bound rubber and the polymer-filler gel formation theory are shown to offer a satisfactory quantitative description of a set of experimental bound-rubber data recently obtained by Wolff, Wang, Tan (R ubber C hem . T echnol . 66 , 163 (1993)) on SBR compounds filled with 17 furnace bl…
Abstract The thermal isomerizations of 1′,3′,3′‐trimethyl‐spiro[2 H ‐1‐benzopyran‐2,2′‐indoline]‐6‐sulphonic acid (6‐SO ‐SP) between its spiro (SP) and merocyanine (MC) forms were followed spectrophotometrically in the presence of cyclodextrins (β‐ and γ‐CDs) at various pressures. From the pressure dependence of the i…
Abstract The use of emulsion polymerization to prepare core–shell rubber (CSR) toughening particles with different shell thickness‐to‐core diameter ratios is described. The conditions leading to controlled particle size and morphology are discussed. The particle shell is crosslinked during the synthesis so that its in…