Materials Literature
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I propose a model of fracture in which the curvature of the crack tip is a relevant dynamical variable and crack advance is governed solely by plastic deformation of the material near the tip. This model is based on a rate-and-state theory of plasticity introduced in earlier papers by Falk, Lobkovsky, and myself. In t…
Abstract Biodegradable lactic acid based poly(ester‐urethanes) (PEU) were polymerized and their structure and rheological properties were characterized. The polymerization process comprised two steps: lactic acid monomer was oligomerized to low molecular weight prepolymer, and this was then linked to high molecular we…
Results are presented for the corrosion process of low carbon steel, under the influence of the combined action of chloride and sulfate ions. The rust composition, the corrosion rates, and the corrosion potential of the rust layers are analyzed. An increase of the relative magnetite content as the corrosion rate incre…
For the evaluation of the dynamic hysteresis loops, a Neural Network (NN) combined with the Fourier Descriptor (FD) technique can be a simple computational instrument alternative to the classical approach. This method is suitable in those cases in which a distorted periodic magnetic field H, or flux density B, excites…
Foil-winding power transformers contain compact sets of flat conductors having a large aspect ratio. Modeling the eddy currents in the individual foils is therefore difficult and requires completely meshed conductors, especially when the influence of the thermal field on the local conductivity is considered. Coupled 2…
Abstract Reduced heptadecavanadate [V17O42]4− has been synthesized from [H3V10O28]3− by the reaction using palladium 1,5-COD complex, and characterized by a single crystal X-ray structure analysis. The structure can be regarded as a fused decavanadate and consists of an arrangement of thirteen edge shared VO6 octahedr…
Some different oxygen content La4Ni3O10+δ (δ=0.02,0.12,−0.22) compounds were prepared in order to study the influence of Ni3+ content on the electronic properties. A metal–metal transition was detected at 140 K for the as-prepared (La4Ni3O10.02) and reduced (La4Ni3O9.78) compounds. From the electrical conductivity, Se…
The effect of a variety of doping additives on the hydration resistance of calcined materials in the MgO–CaO system was investigated. Samples were prepared from lightly calcined flotation magnesite that was mixed with dolomite, as well as from analytically pure CaO and MgO; then, the samples were doped with additives…
The crystallization of Zr41Ti14Cu12Ni10Be23 (Vit 1) melts during constant heating is investigated. (Vit 1) melts are cooled with different rates into the amorphous state and the crystallization temperature upon subsequent heating is studied. In addition, Vit 1 melts are cooled using a constant rate to different temper…
A tank shield model of a transformer which is proposed by the Investigation Committee of IEE of Japan is analyzed. This is a model having the constraint that the maximum eddy current density should be less than a specified value. The automatic 3D mesh generation technique for hexahedral element is investigated for the…
This paper presents a three-dimensional coupled approach for transient simulation of electromagnetic devices. The approach is based on the A-V-A formulation, in which the eddy current field and the electric circuit equations are solved simultaneously. The Newton-Raphson procedure has been used to take the magnetic non…
Polypropylene is increasingly being used for the thermoforming of food packaging. Compared with amorphous materials, such as polystyrene, it is much more difficult to process and within the industry it is generally poorly understood. In the present study the effects of pigments and nucleating agent on the crystallisat…
A series of back-coated cotton fabrics comprising varying molar ratios of chlorine, bromine and antimony has been studied using a simulated match ignition test, LOI and thermal analysis (TGA and DTA). Results show that the presence of chlorine alone and in combination with bro mine increases LOI and carbonaceous char…
A precise way of estimating the packing coefficient, i.e. the ratio between the protein and unit-cell volume, or solvent content in protein crystals is given. At present, the solvent content is not given for most proteins in the Protein Data Bank and in many cases where it is given the values are dubious. The mean den…
In this work the surface electronic and structural properties of about 150 nm thick WO3 films, deposited in high vacuum by thermal evaporation onto Si substrates, have been studied in ultrahigh vacuum (UHV) by means of x-ray photoemission spectroscopy (XPS) and scanning tunneling microscopy (STM)/spectroscopy. After d…
Sintering of magnesium aluminate spinel of the MgO‐excess, stoichiometric, and Al 2 O 3 ‐excess compositions has been investigated under vacuum and in air for the effect of low oxygen partial pressures. Densification enhancement of the surface layer is due to MgO evaporation which generates oxygen vacancies in the hos…
We report magnetization measurements in the Ln(Mn1−xCox)O3+λ (Ln=Eu, Nd; 0⩽x<1) and Y(Mn1−xCox)O3 (0.35⩽x⩽0.5) perovskites as a function of temperature and magnetic field. Compositions in the range of 0.35⩽x⩽0.8 (Ln=Eu), 0.4⩽x⩽0.6 (Ln=Nd), and 0.35⩽x⩽0.45 (Ln=Y) exhibit metamagnetic behavior associated with a t…
Investigations have been carried out to study the effect of processing parameters, namely holding time, temperature, and pressure, on the consolidation quality and mechanical properties of GF/PP commingled yam based composites. The consolidation quality has been defined in terms of the void content in the laminate, an…
Abstract In this paper, I review the structural and physical properties of the gold mixed-valence complexes, M2[AuIX2][AuIIIX4] (M = Rb, Cs; X = Cl, Br, and I), having perovskite-type structure. In spite of the three dimensional perovskite-type structure, the charge transfer interaction between AuI and AuIII in these…
Domain II (residues 189-338, M(r) = 16 222) of glutamate dehydrogenase from the hyperthermophilic bacterium Thermotoga maritima was used as a model system to study reversible unfolding thermodynamics of this hyperthermostable enzyme. The protein was produced in large quantities in E.COLI: using a T7 expression system.…