Materials Literature
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Summary In this paper, the transport and speciation of ruthenium under conditions simulating an air ingress accident was studied. Ruthenium dioxide was exposed to an oxidising environment at high temperatures (>1200 °C) in a tubular flow furnace. At these conditions, volatile ruthenium species were formed. A major…
Single crystals of MnOOH and were synthesized through a simple sol-gel route. From transmission electron microscopy. Fourier transform infrared, X-ray diffraction, and selected area electron diffraction analyses, manganese oxides prepared in this work are demonstrated to be a mixture consisting of MnOOH and single cry…
ZnO thin film field effect transistors with 1.5–20μm gate width were fabricated using either a metal gate [metal–semiconductor field effect transistor (MESFET)] or a metal–oxide–semiconductor (MOS) gate. In both cases we found that use of a thick (∼0.8–0.9μm) ZnO buffer was necessary on the sapphire or glass substrate…
Abstract Degradation can result from a variety of chemical, physical and mechanical mechanisms, most of them involving a reduction of molecular weight and thus a decrease in the mechanical performance of the degraded polymer. A clear understanding and control of these mechanisms is absolutely essential: without stabil…
The shape–memory effect is well documented in uranium–niobium alloys near the α″–γo metastable phase boundary. In situ neutron diffraction measurements during uniaxial loading indicate that U–14 at.% Nb (in the α″ monoclinic phase field) deforms by stress–induced twin reorientation. Alternatively, U–16 at.% Nb (initia…
The phase diagram with monoclinic phase near the morphotropic phase boundary (MPB) and the dielectric constant in a solid-solution system of perovskite-type ferroelectrics are discussed on the basis of the Landau–Devonshire-type free-energy function expressed in terms of polarization components. It is confirmed that t…
To analyze the mechanical dynamic characteristics of electromechanical system, we present a new and fast method using the reduced modeling technique for the levitated conductor. As of now, to solve this electromechanical system, the finite element method (FEM) or the boundary element method (BEM) employing the finite…
Abstract The first examples of 3d–4f heterometallic complexes containing picolinic acid ligands were synthesized and characterized. Three series of complexes were obtained by the reaction of presynthesized “metallo ligands” Cu(pic) 2 and Ln(ClO 4 ) 3 in 2:1, 3:1, and 4:1 mole ratios. Complexes 1 – 3 ( denoted as the f…
Binary hydrophilic blends of poly(acrylamide‐co‐methylene bis acrylamide) grafted polyvinyl alcohol (PVA) and gelatin (GEL) were prepared by redox polymerization method and the end product was characterized by infra red (IR) spectral analysis, differential scanning calorimety (DSC) measurements, and scanning electron…
status: Published
Novel asymmetrically meso-substituted porphyrins bearing amino groups have been synthesized as precursors of cationic photodynamic agents. The amphiphilic character of these porphyrins was increased by the presence of a high lipophilic trifluoromethyl group. Different patterns of porphyrin structures were obtained fro…
In this paper, using suitable three-dimensional finite element method (FEM) approaches, either in frequency or in time domain, we will analyze the real magnetic behavior of a commercial Epstein machine, prescribed as standard magnetic measurement system. The analysis of magnetic field and eddy currents explains some f…
: The composites of banana, hemp, and agave with HDPE resin were separately prepared in different ratios, 60:40, 55:45, 50:50, and 45:55 (wt/wt). These fibers were also treated with maleic anhydride and the effect of maleic anhydride was studied on surface resistivity and volume resistivity of wood polymer composites.…
Palladium was electrodeposited onto the tips of isolated carbon nanofibers and carbon nanopipes using an electric field. The amount of Pd deposited on the tips was controlled by varying the field application time. The morphology obtained varied from agglomerate of small particles that just covers the end of the nanotu…
Polymeric materials in automobiles have experienced a realboom in the last twenty years, and their application is increasingwith a tendency of further growth. The basic functions ofsuch wide application of polymeric materials in vehicles dictatethe appearance of the automobiles, their functionality, economyand low fue…
Data are presented on the dielectric strength of thin polymer films. The conclusion is drawn that the electron avalanche concept is inapplicable to the breakdown of thin films. It is proposed to consider electrical breakdown as a consequence of an abrupt local field enhancement induced by evolution of the space charge…
We induced a permanent plastic deformation in an originally straight double-walled nanotube by applying current to an individual nanotube that had been bent elastically under mechanical duress. This method is controllable and allows nanotubes' application as building blocks in nanostructures. Inserting pentagon–heptag…
The time dependent density functional theory (TDDFT) has been employed to calculate the X-ray absorption spectra of the alkaline-earth oxides at the metal K and L and oxygen K edges. Cluster models to mimic the bulk are considered, embedded within an array of point charges to simulate the Madelung potential. Compariso…
This paper deals with a mixed analytical and numerical method to study the electromagnetic and thermal behavior of a dry type transformer under nonlinear loads. First a three-dimensional finite element method (FEM) using a magnetic scalar potential formulation is applied to compute the magnetic field in the free and i…
BACKGROUND: Anecdotally, patients volunteer reports of increasing hardness of their fingernails within months of starting diverse treatments for osteoporosis. The properties of both nail and bone may be linked in a comparable, measurable way. METHODS: We examined the fingernails of two groups of patients, with (n = 9)…