Synthesis of Isocyanates by the Reaction of Certain Primary Amines with Benzyl Carbonochloridate
Synthese d'isocyanates d'alkyle et d'allyle par reaction d'alkyl- et allyl-amines avec CS 2 , NaOH et le chloroformiate de benzyle
Materials Literature
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A Study of Corrosion of Steel Under a Variety of Thermal Insulation Materials
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…
Studies on the Effect of Minor Glass Additives on the Sintering and Dielectric Properties of Barium Titanate
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…
Enhanced Release of Drugs from Silicone Elastomers (III): Subcutaneous Controlled Administration of Melatonin for Early Onset of Estrus Cycles in Ewes
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…
Laboratory Electrochemical Test Methods
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.…
On reliability analysis of ceramics under multi-axial stress states (1st report, Examination of application of two-parameter weibull distributions)
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.
Electrodeposition of Molybdenum in KF–B<SUB>2</SUB>O<SUB>3</SUB>–Na<SUB>2</SUB>MoO<SUB>4</SUB> Fused Salts
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.
Natural Fibres and Agro-wastes as fillers and reinforcements in polymer composites.
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…
Discrimination of living or dead cells of diatom based on the stained images - Its method and significance.
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…
Effective Distribution Coefficient of Silicon Dopants During Magnetic Czochralski Growth
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…
A Low Temperature, High Yield Synthesis of Carbon Selenide Sulfide
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%
Coupling of Sliding and Migration in Coincidence Boundaries of Zn and Al Bicrystals and their DSC Dislocation Models
Grain boundary sliding behavior was investigated in coincidence boundaries of Zn and Al bicrystal specimens, in order to demonstrate the applicability of the DSC dislocation model. Two coincidence boundaries, viz. a 〈10\bar10〉 symmetric tilt boundary with a {1\bar216} boundary plane in Zn and a 〈1\bar10〉 symmetric til…
Ion Bombardment Damage in a Modified Fe-9Cr-1Mo Steel
A normalized-and-tempered Fe-9Cr-1Mo steel, modified with small quantities of niobium and vanadium, was bombarded with 4 MeV iron ions to a nominal displacement level of 100 displacements per atom (dpa) at temperatures of 400, 450, 500, 550, and 600°C. The major microstructural damage feature created in the lathlike α…
LABORATORY EVALUATION OF FOUR RAPID-SETTING CONCRETE PATCHING MATERIALS
Many proprietary patching products are available for the repair of portland cement concrete (PCC) pavement. These materials must cure rapidly to minimize delay and limit safety hazard exposure to both the traveling public and maintenance personnel. However, long-term strength and durability are equally important, alth…
Analysis of high frequency magnetic properties of compressed iron powder cores.
In order to clarify the factors determining the high frequency magnetic properties of compressed iron powder cores, complex permeability was calculated and compared with measured values.Permeability at lower frequencies depends on the intrinsic permeability, effective demagnetization coefficient and packing fraction o…
Thermodynamics of vaporization of fission products and materials under severe reactor accident conditions
Article Thermodynamics of vaporization of fission products and materials under severe reactor accident conditions was published on January 1, 1985 in the journal Pure and Applied Chemistry (volume 57, issue 1).
Electron microscopy and diffraction of modulated structures
Abstract
Actinocyclus ingens Rattray: Reinvestigation of a Polymorphic Species
Rattray described the marine fossil diatom Actinocyclus ingens as having an undulating valve with a concentric elevation around a central depression. Two other valve types are also observed in this species: a flat valve and a different undulate form that has a convex center. Apparently, these valve types may be arrang…
Loss increases due to chemical reactions of hydrogen in silica glass optical fibers
Loss increases due to the chemical reactions of hydrogen are investigated for GeO2-doped, GeO2. F-doped, and pure silica core fibers. Dissolved hydrogen gas causes the hydroxyl loss increase as well as the short-wavelength loss increase in the first two fiber types at high temperatures. The short-wavelength loss incre…
Symmetries in texture analysis
It is shown that a comprehensive symmetry description in polycrystalline bodies needs black-white point groups rather than the usual (one-colour) groups that are sufficient for single crystals.