Materials Literature
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A novel impact bend test procedure is described for determining the dynamic fracture-initiation toughness, KId, at a loading rate KI of the order of 106MPa√m/s. The split Hopkinson pressure bar technique was used to measure dynamic loads applied to a fatigue-precracked bend specimen. The dynamic stress intensity facto…
The 57Fe Mössbauer spectroscopy has been used to study the liquid crystalline disubstituted derivatives of ferrocene (FLCn). Characteristic Debye temperatures, order parameters, intramolecualar and lattice contributions to the nuclear vibrational anisotropy have been obtained for these compounds and 7% (weight) soluti…
Complex material parameters (piezoelectric coefficient d31, elastic s11 E, and the dielectric constant K33) of the relaxor ferroelectric ceramic (1−x) Pb(Mg1/3Nb2/3)O3-xPbTiO3(x =.07) with 1% La (lanthanum) were measured as a function of bias field using a bar resonator. The values of the dielectric and piezoelectric…
Polymeric amines, containing the monomeric unit –CH2–CH2–NH– (PEI or LPEI). are versatile ligands, forming complexes in aqueous solutions with many labile metal ions, even at relatively low pH, due to the strong chelate effect. The mean distances between the metal centers within a polymer chain is small in solutions w…
F.c.c. metal single crystals are numerically modeled to simulate evolution of the deformation band. The models include simplified inhomogeneities in resistance to slip deformation. Slip deformation in the models is examined by a finite element method. Analysis results show that slip deformation of some part of the spe…
Rates of He release from two kinds of simulated high-level radioactive waste glasses were measured in the temperature range from 573 to 753K by a mass spectrometric method. Diffusion coefficients of He in the glasses were determined from the fractional release data. The diffusion coefficients were given as a function…
We present a new algorithm for the generation of quasicrystalline structures. It is related to the cut and projection method, but allows a direct generation of the structure in the « physical » space E. The orthogonal space site selection is replaced by a direct check in a periodic array of « acceptance » regions in E…
Author: Stratmann, M.; Genre: Journal Article; Published in Print: 1990; Title: The Atmospheric Corrosion of Iron - A Discussion of the Physico-Chemical Fundamentals of this Omnipresent Corrosion Process
Inhibition of the corrosion of carbon steels by lithium molybdate in bellow 21.4mol/kg-H2O alkaline lithium bromide aqueous solution was investigated in glass sealed tube at various temperatures. Lithium molybdate gives an excellent corrosion inhibition for carbon steel even at a concentration as low as 0.003mol/kg-H2…
The "back-attack" phenomenon was suspected to be an important factor in tuyere refractory erosion, so the characteristics of submerged high speed gas jet were investigated in a water model, and the mechanism of the back-attack generation was clarified.1) The submerged gas jet forms a cavity in the bath, but occasional…
Abstract Des cristaux de KZr 2 (AsO 4 ) 3 ont été préparés par la méthode de flux. L'étude cristallographique de ce composé a montré que celui‐ci cristallise dans le système rhomboédrique avec les paramètres a = 9,028(1) Å; c = 24,399(3) Å. d = 3,694 g/cm 3 ; Z = 6 groupements formulaires par maille, le groupe d'espac…
The magnetic properties of cast and hot-rolled Pr/sub 17/Fe/sub 77.5/B/sub 4/ M/sub 1.5/ (M=Cu, Ga, Ag, Al, In, and Pb) alloys were investigated in order to explore the role of additive elements in improving the magnetic properties in the Pr-Fe-B system. It is found that Ga and Ag additions have an effect similar to t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural investigation of lithium-ammonia intercalation compounds of titanium sulfide (TiS2)V. G. Young, Jr., M. J. McKelvy, W. S. Glaunsinger, and R. B. Von DreeleCite this: Chem. Mater. 1990, 2, 1, 75–81Publication Date (Print):January 1, 1990Publication History Publishe…
ABSTRACT Imperfections in lint cotton, particularly neps and seed-coat fragments, reduce processing efficiency in the textile mill and detract from appearance in yam and fabric. This study identified fiber properties and varieties which are consistently associated with low nep and seed-coat fragment levels in ginned l…
Electrophoretic and spectroscopic data together with the isolation and structural characterisation of [{TcN(S2CNEt2)}2(µ-O)2] provide evidence for the formation of the TcVI aquanitrido dimer [{TcN(OH2)3}2(µ-O)2]2+ in solutions of weakly co-ordinating acids.
Abstract The melting point T m of semi‐crystalline polyethylene terephthalate is correlated with the thickness l c /nm of the crystalline lamellae by the unique relation 1/T m = 1/594.5 + 0.001759/l c . This correlation is independent of the temperature of crystallization, the molecular weight or the annealing. This d…
This paper shows an experiment carried out with Brazilian materials (clinker, limestone, and natural gypsum) to determine the optimum sulfur trioxide (SO3) content, varying the degree of fineness and the limestone content in the cements which were obtained by grinding them together, in the laboratory. The laboratory t…
In order to clarify the necessary conditions for cavitation-erosion tests with a vibratory apparatus, we carefully measure the cavitation-nuclei-size distributions and the relative air content rate of test water with respect to time by means of a Coulter counter and a van Slyke apparatus, respectively. It is found tha…
Single crystals of ZnGeO 3 ilmenite have been synthesized at 180 kbar and 1500°C using a uniaxial split-sphere apparatus. The crystal structure of ZnGeO 3 ilmenite has been determined with 588 counter-measured intensities refined by the least-squares method to R = 0.020 and R w = 0.021. ZnGeO 3 ilmenite is trigonal wi…
A testing technique has been developed for measuring the tensile properties of ceramic matrix composite laminates at temperatures up to 1500°C in air. Using this technique, the tensile properties of unidirectional silicon carbide (SiC) fiber reinforced reaction bonded silicon nitride (SiC/RBSN) composite specimens wer…