Materials Literature
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The transition behaviour of deformation mode from particle shearing to looping has been investigated in the Al-Li alloy single crystals using optical microscopy, transmission electron microscopy and mechanical testing. The observation of slip-line morphology and of dislocation structures indicated the occurrence of a…
The detection of atomic‐size defects by atomic force microscopy (AFM) is demonstrated. For example, the dark grooves in the image of the surface of the incommensurate layered telluride phase TaGe 0.355 Te 2 (see Figure) indicate a defect. The origin of this incommensurate structure of layered tellurides is established…
The charging of an insulator surface when irradiated with a stationary low-energy electron probe is simulated by Monte Carlo techniques. Results show that the irradiated core initially charges positively, causing a potential barrier to form, thereby attracting lower energy secondary electrons back towards the surface.…
Abstract A comparison of the magnitudes of yarn-to-yarn and fabric-to-fabric friction is made. It is shown that yarn friction measured on a capstan (cylindrical) surface is significantly greater than that measured on a flat surface. The greater magnitude of the coefficient of friction in a capstan assembly is ascribed…
Abstract The sorption of ethyl acetate and limonene as individual sorbates and in binary vapour mixtures by an oriented polypropylene was determined by two independent methods, namely by gravimetric and thermal stripping/thermal desorption procedures. The two methods showed excellent agreement. The solubility coeffici…
The modelling methods developed so far for grain-oriented electrical steels can not account for the true properties of materials. When these models were developed, more consideration was given to obtain fast convergence speed for numerical iterations than the accuracy of models themselves. For magnetic materials, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of K-Doped Molybdena-on-Alumina Catalysts As Studied by X-ray Absorption and Raman SpectroscopyN. F. D. Verbruggen, G. Mestl, L. M. J. von Hippel, B. Lengeler, and H. KnoezingerCite this: Langmuir 1994, 10, 9, 3063–3072Publication Date (Print):September 1, 1994Publ…
The present study takes advantage of the ability of Fourier Transform Infrared Spectroscopy (FTIR) for the analysis of ultrathin organic films on metals. FTIR in the reflection mode (IRRAS) is used in order to study the interaction of ultrathin films of dicyandiamide (hardener of most one-pack epoxy resins) with vario…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic Structure and Stability of closo-Heteroboranes, XYBnHn (n = 3-5; X, Y = N, CH, P, and SiH). An ab Initio MO StudyEluvathingal D. Jemmis and G. SubramanianCite this: J. Phys. Chem. 1994, 98, 37, 9222–9226Publication Date (Print):September 1, 1994Publication History…
A computational method was used to calculate the distance-dependent adsorption energies of three proteins, immunoglobulin Fab, trypsin, and lysozyme, on polyethylene, polypropylene, and poly(vinyl alcohol) surfaces. Two different protein orientations for each protein were used to calculate the interaction energy as a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic Tantalum(V) Bis(dicarbollide) Complexes with Bent-Metallocene StructuresRoger Uhrhammer, Yue-Xin Su, Dale C. Swenson, and Richard F. JordanCite this: Inorg. Chem. 1994, 33, 19, 4398–4402Publication Date (Print):September 1, 1994Publication History Published online1 M…
A new test method has been developed to measure the resistance of dynamic fracture initiation in brittle materials under combined mode I / II loadings. The Brazilian disks with center-cracks have been fractured under oblique impact loadings in diametral-compression. The dynamic stress intensity factors of mode I and I…
The reactions of the N.N'-dialkyl/aryl-ethylenediamines l a - e with equimolar amounts of tetrachlorosilane give the monocyclic aminosilanes 2 a - e in good yields. With two equivalents of the diamines 1 only one spirobicyclic compound, l,4,6,9-tetrabenzyl-l,4,6,9-tetraaza-5-silaspiro[ 4.4]nonane, 4e, can be prepared.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExactly alternating silarylene-siloxane polymers. 10. Synthesis and characterization of silphenylene-siloxane polymers containing fluoroalkyl and hydrido side groupsPetar R. Dvornic and Robert W. LenzCite this: Macromolecules 1994, 27, 20, 5833–5838Publication Date (Print):S…
The use of cobalt or nickel alloys for added wear resistance was initiated in the early 1900s with the development of the cobalt-chromium-tungsten family of alloys. The cobalt alloys were called the Stellite'' because of their bright, shiny, nontarnished appearance. Further development and characterization of this all…
A thermal scanning camera has been used to measure the temperatures reached in a small tensile specimen of ductile Remco iron deformed at a strain rate of about 1600 s -1 in a split Hopkinson bar apparatus. True strains as high as 3.3 were reached in times of about 200 mu s, leading to a significant rise in temperatur…
The Escherichia coli K-12 NAD-dependent nucleotide-diphosphosugar epimerase, ADP-L-glycero-D-mannoheptose 6-epimerase, catalyzes the conversion of ADP-D-glycero-D-mannoheptose to ADP-L-glycero-D-mannoheptose. ADP-L-glycero-D-mannoheptose is a key intermediate of lipopolysaccharide inner core biosynthesis in several ge…
The structures, solution properties and solid state properties of complexes of poly(benzobisimidazobenzophenanthroline) ladder (BBL) and its semiladder analogue (BBB) with the Lewis acid aluminium(III) chloride (AlCl3) and gallium(III) chloride (GaCl3) are reported. At a 4:1 mole ratio of Lewis acid to polymer (BBB or…
Copper (II) oxide films of high chemical and crystal purity have been grown on MgO(100) substrates using pulsed laser ablation (248 nm) of copper in conjunction with a pulsed oxidizing gas source (N2O). A novel experimental geometry is presented, in which the gas pulse and ablation plume cross close to their respectiv…
We have investigated the temperature and concentration dependence of cross-relaxation processes in single-crystal fibers of YAG:${\mathrm{Pr}}^{3+}$ which were grown using the laser-heated pedestal growth technique. We have compared the time evolution of the $^{3}$${\mathit{P}}_{0}$${\ensuremath{\rightarrow}}^{3}$${\m…