The Precipitation of Primary Carbides in Alloy 718
The precipitation of primary MC carbides in alloy 7 18 has been studied using the techniques of directional solidification with and without quenching. The precipitation reaction:
Materials Literature
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Theoretical Analysis of the Discharge Performance of a NiOOH / H 2 Cell
A mathematical model is presented for the discharge of a cell. This model includes diffusion and migration in the electrolyte phase as well as proton diffusion and ohmic drop across the solid active material in the porous nickel electrode. A theoretical analysis of the cell performance is presented for different desig…
Modern theory of polarization in ferroelectrics
A modern theory of the macroscopic electric polarization has been recently founded. Polarization itself is not an observable, while the polarization difference ΔP between any two crystal states can be measured, defined, and calculated as a bulk material property. An hysteresis cycle measures ΔP as the integrated curre…
SHOCK WAVE DEVELOPMENT IN THE COLLAPSE OF A CLOUD OF BUBBLES
A numerical simulation of the collapse of a cloud of bubbles has been used to demonstrate the development of an inwardly propagating shock wave which grows rapidly in magnitude. The fully non-linear nonbarotropic homogeneous flow equations are coupled with single bubble dynamics and solved by a stable numerical scheme…
Auto-Acceleration Effect in Free Radical Polymerization. A Comparison of the CCS and MH Models
A comparison of the structure and performance behaviour of two popular models for modelling diffusion-controlled kinetics in free radical polymerization (the so called Chiu-Carratt-Soong, CCS, and Marten-Hamielec, MH, models) is presented. It is demonstrated that if some modifications on their structure are made, and…
Chain dynamics in coronas of ionomer aggregates
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain dynamics in coronas of ionomer aggregatesZhisheng Gao, Xing Fu Zhong, and Adi EisenbergCite this: Macromolecules 1994, 27, 3, 794–802Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs.o…
Effect of Hydrostatic Pressure on Passivating Power of Corrosion Layers Formed on 6061 T6 Aluminium Alloy in Sea Water
The effect of an increase in hydrostatic pressure (from 1 to 300 atm) on the composition of the corrosion layer formed on 6061 T6 aluminium alloy in sea water was studied using electrochemical (polarisation potentiodynamic curves and impedance measurements) and surface analysis (X-ray photoelectron spectroscopy and Fo…
Syntheses of novel monomeric 1,4,7-trimethyl-1,4,7-triazacyclononane ruthenium complexes. Reactivities and structure of sterically encumbered cationic monoaquaruthenium(II) and monooxoruthenium(IV) complexes
The complexes [RuII(tacn)(bipy)(OH2)]2+1 and [RuIV(tacn)(bipy)O]2+2(tacn = 1,4,7-trimethyl-1,4,7-triazacyclononane, bipy = 2,2′-bipyridine) have been synthesised and their crystal structures determined: 1, monoclinic, space group C2/c, a= 34.093(4), b= 10.430(1), c= 17.369(2)Å, β= 118.54(1)° and Z= 8; 2, triclinic, sp…
Investigations on triallylthiourea mercury bromide (ATMB) crystal growth
Abstract This paper presents the growth process of a new organometallic nonlinear optical (NLO) crystal triallylthiourea mercury bromide (ATMB). The growth conditions are analyzed in terms of the pH value of solution, and also crack of the crystal is interpreted according to anisotropy of thermal expansion coefficient…
Dendritic growth
Dendritic structures are the predominant microstructural constituents of solidified alloys. The microstructural scales of dendrites, such as primary and secondary arm spacings, control the segregation pattern that largely determines the properties of the material. Within the past decade significant developments in und…
Raman scattering by high-density dispersions. III. Calculation of Raman intensities for molecules physisorbed on linear chains of spherical particles
In parts I and II of this series, the dominant role of ‘‘primary’’ Raman moments of degree greater than one, to Raman intensities for molecules forming a uniform coating on pairs of spherical particles in close proximity, is demonstrated. In this paper, the effect of chain length, coverage, particle size, and separati…
Directing Polymorph Selectivity During Nucleation of Anthranilic Acid on Molecular Substrates
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirecting Polymorph Selectivity During Nucleation of Anthranilic Acid on Molecular SubstratesPhillip W. Carter and Michael D. WardCite this: J. Am. Chem. Soc. 1994, 116, 2, 769–770Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published…
Laboratory Evaluations of Solubility and Structural Integrity of Complexed and Chelated Trace Mineral Supplements
Commercially complexed and chelated mineral supplements (5 Cu, 5 Zn, and 5 Mn products) were evaluated for solubility of their metals at concentrations of .125, .25, .5, 2.5, and 12.5 mg/ml in buffers at pH 5 and 2. At pH 5, solubility was related inversely to concentration, and most products were highly soluble at th…
Ice adhesion to rubber materials
The aim of this study was to investigate the interfacial shear strength between ice and rubbers. Different rubber materials containing only a polymer and curing agent (peroxide) were tested with regard to surface wettability and interfacial shear strength. The effect of different grades and amounts of carbon black fil…
How the Tetragonal Zirconia is Stabilized in the Oxide Scale that is Formed on a Zirconium Alloy Corroded at 400°C in Steam
Zircaloy-4, in three different metallurgical forms (stress relieved, recrystallized, and β-quenched), was oxidized at 400°C, in steam, up to 95 days. For each sample, the fraction of tetragonal zirconia was measured by X-ray diffraction and Raman spectroscopy. These two techniques show the presence of several zones co…
Ca(2+)-calmodulin-dependent phosphorylation of arginine in histone 3 by a nuclear kinase from mouse leukemia cells.
A Ca(2+)-calmodulin dependent histone 3 kinase was partially purified from a low salt (150 mM NaCl) nuclear extract of mouse leukemia cells by calmodulin-Sepharose affinity chromatography. In vitro, the kinase activity transferred gamma-phosphate from ATP to histone 3 to form an acid-labile and alkaline-stable linkage…
Magnesium alloys and applications
The methods for producing magnesium are briefly described and its alloying behaviour is discussed with particular reference to the roles of individual alloying elements. Cast and wrought alloys are considered separately and particular attention is paid to microstructure–property relationships and corrosion behaviour.…
Vibrational spectra of penta-atomic silicon–carbon clusters. II. Linear Si2C3
Fourier transform infrared matrix measurements carried out in conjunction with ab initio calculations reported in a companion paper by Rittby have resulted in the first identification of two fundamental vibrations, the C=C stretching mode ν3(σu)=1955.2 cm−1, and the Si–C stretching mode ν4(σu)=898.9 cm−1, of the SiC3S…
Tailored microstructures of silicon nitride ceramics
Abstract
An examination of the structures of iodosylbenzene (PhIO) and the related imido compound, PhINSO 2 -4-Me-C 6 H 4 , by X-ray powder diffraction and EXAFS (extended X-ray absorption fine structure) spectroscopy
Structural data derived from X-ray powder diffraction and EXAFS spectroscopy are presented for iodosylbenzene (PhIO) and the imido analogue, PhINSO2-4-Me-C6H4, which indicate that these compounds are polymeric in the solid state.