Materials Literature
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The carbon deposition on iron has been studied by means of metallography and thermogravimetry, in order to investigate the carbon depositing behavior and the rate-determining step of the reacion. Two types of carbon, laminar carbon and filamentous carbon, are observed to deposit on iron. The deposition of laminar carb…
The purpose of this paper is to examine not only qualitatively but also quantitatively the influence of a rise time of longitudinal impact on the propagation of elastic waves in a bar. The adequacy of application of Love's theory for the propagation of longitudinal elastic waves to this problem is discussed by means o…
Abstract Thermal behavior of unfractionated poly(2‐methoxy)‐Cyanurate, PMCBC‐ film has been reported. The degradation of the polymer involved two steps. The glass transition temperature, T g , from DSC and DMA studies is ∼ 200°C. TMA study shows that the glass‐rubber transition region is in the range of 157 to 199°C.…
The data base of Type 316 stainless steel 20% cold-worked cladding swelling measurements from mixed-oxide fuel pins irradiated in Experimental Breeder Reactor-II (EBR-II) has been extended to a fast (E > 0.1 MeV) fluence of 17 × 1022 neutrons (n)/cm2. Previously, the data base from actual fuel pins included onl…
Abstract The fatty acid composition of three seed oils of Apocynaceae has been studied in this investigation. The seed oils of Apocynaceae were examined for their component acids and were found to contain the following acids: Rauwolfia serpentina , Benth, (wt.%) lauric 0.2 %, myristic 0.8 %, palmitic 17.7%, stearic 4.…
It is the purpose of this paper to analyse the problem of stress waves in a circular disk subjected to two equal and opposite concentrated impact loads at the end points of a diameter. The solution is based on the stress function approach and the Laplace transform method to a two dimensional non-axisymmetrical dynamic…
It has been demonstrated recently that ion simulations of neutron-induced swelling are strongly affected by the presence of the injected ion acting as an extra interstitial atom. The injected interstitial has been shown to exert a strong influence on both the void nucleation and steady-state regimes of swelling. In du…
1 H and 13C N.m.r. spectra of the title compound are reported, the latter showing unusual 13C–1H residual couplings which are rationalized by ‘through-space’ interactions between the Centrally co-ordinated hydroxy hydrogen and porphyrin carbon nuclei.
Abstract Isotactic polypropylene of various degrees of crosslinking was prepared using high concentrations of dicumyl peroxide as the crosslinking agent. Free radicals were generated by γ irradiation of crosslinked iso‐PP with a dose of 2.4 Mrad. It was found that the rate constant for free‐radical decay is independen…
Synthese d'isocyanates d'alkyle et d'allyle par reaction d'alkyl- et allyl-amines avec CS 2 , NaOH et le chloroformiate de benzyle
Corrosion of steel equipment under thermal insulation is and has been a costly problem in Union Carbide Corporation (UCC) chemical operations as well as other refining and chemical plants throughout the world. The Materials Technology Institute (MTI) has spent about $30 thousand trying to develop a nondestructive insp…
The sintering temperature of barium titanate was reduced to 110°C by using low melting glasses like BaO—B2O3 and highly polarizable glasses like Bi2O3–B2O3 and PbO—B2O3 which were added in BaTiO3 up to a maximum of 10 wt%. Addition of low melting glass powder accelerated densification by liquid phase sintering. Sinter…
Implants were fabricated from swellable silicone elastomers to release hydrophilic melatonin at a controlled rate for the early induction of breeding season in ewes. Both the in vitro and in vitro release profiles of melatonin were observed to follow a linear Q vs. t1/2 relationship. The in vitro/in vivo release flux…
Corrosion is an electrochemical reaction of a metal and its environment. The aim of this paper is to provide an understanding of some of the electrochemical processes that result in corrosion and to provide a reference compendium of the present state of the art laboratory test methods used to evaluate these reactions.…
多軸応力下でのセラミックスの信頼性評価の基礎として,2母数ワイブル分布のワイブル係数(形状母数)が応力状態に依存しない材料定数と考えて良いかどうかを検討し,従来の研究よりも一般的な条件のもとでこれが材料定数であることを理論的に示した.また実験データからワイブル係数を推定する場合の信頼区間を提示した.さらに強度が2母数ワイブル分布に従うという前提の下で,き裂寸法の分布を理論的に導いた.
Visually smooth and adherent deposits of molybdenum have been obtained electrolytically on a copper, a nickel, a stainless steel and a molvbdenum substrate in a KF–B2O3–Na2MoO4 fused salt at temperatures of 1023–l173 K and current densities of 110–1880 A/m2 with a molybdenum and a graphite anode.
The research imperatives in composites containing natural fibres, such as sisal and sunhemp, and certain agro-wastes like rice husk, corn and peanut shell, are discussed. These materials are classified into two categories: (i) particulate, and (ii) fibrous types of fillers. This paper highlights the economics of using…
It is an important and fundamental study in paleoecology to examine accurately the distribution and ecology of living assemblages. In the case of diatoms, however, living assemblages have been unalbe to be selected from the total assemblages including dead cells.Hematoxylin and Eosin stain which is in general use to o…
Silicon crystals have been grown under axial magnetic fields of up to 0.2 T. At 0.05 T the field starts to interact with the melt and dopant incorporation becomes erratic. As the field is increased to 0.2 T the interaction becomes more controlled and it is seen that the effective distribution coefficient (keff) moves…
On peut preparer CSSe en 2 ou 3 etapes a partir de chlorure de N,N-dimethylthiocarbamoyle avec un rendement de 54 a 58% et une purete de 99,5%