Materials Literature
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Temperature dependent studies of the 1/2(hk0) superlattice reflections αspots by synchrotron x-ray scattering measurements were performed in (PMN) and (PMN-xPT) with Ti doping x<0.32 single crystals. Separation of the αspots from the underlying diffuse scattering background allowed studying them as separate entities f…
The critical current density (Jc) of hot isostatic pressed (HIPed) MgB2 wires, measured by d.c. transport and magnetization, is compared with that of similar wires annealed at ambient pressure. The HIPed wires have a higher Jc than the annealed wires, especially at high temperatures and magnetic fields, and higher irr…
Reflection electron energy loss spectroscopy (EELS) in specular and off specular geometry has been employed to study the early stage of the copper phthalocyanine (CuPc) growth on Al (100) substrate. EEL spectroscopy has been a useful tool in order to study electronic structure of molecular films also in the submonolay…
Mn-Ce mixed-oxide catalyst yields nearly 100% NO conversion at 100-150 degrees C at a high space velocity of 42,000 h(-1). SO2 and H2O (at high concentrations) have only slight effects on the activity.
Temperature-dependent Brillouin scattering studies have been carried out on La_{0.77}Ca_{0.23}MnO_3 across the paramagnetic insulator - ferromagnetic metal (I-M) transition. The spectra show a surface Rayleigh wave (SRW) and a high velocity pseudo surface acoustic wave (HVPSAW) besides bulk acoustic waves (BAW). The B…
We argue that an ionic lattice surrounded by a Fermi liquid changes phase several times under pressure, oscillating between the symmetric phase and a low-symmetry dimerized structure, as a consequence of Friedel oscillations in the pair potential. Phase oscillations explain the tendency towards dimerization which has…
While attempting to find a suitable crosslinking reagent for biopolymers, a naturally occurring proanthocyanidin (PA) obtained from grape seeds was selected to fix biological tissues. The cytotoxicity and crosslinking rate, reflected by the in vitro and in vivo degradation of fixed matrices has been studied. The shrin…
Recently developed AFM local anodic oxidation (LAO) technique offers a convenient way of patterning nanodevices, but imposes even more stringent requirements on the underlying quantum well structure. We developed a new very shallow quantum well design which allows the depth and density of the 2D gas to be independentl…
The consistency of angle-resolved photoemission and optical conductivity experiments on high temperature superconductors is examined. In the limit (apparently consistent with angle-resolved photoemission data) of an electron self energy with a weak momentum dependence and a strong frequency dependence formulae are der…
In this paper we present an experimental study of the long surface wave instability that can develop when a granular material flows down a rough inclined plane. The threshold and the dispersion relation of the instability are precisely measured by imposing a controlled perturbation at the entrance of the flow and meas…
Lattice dynamics for several ordered supercells with composition PbMg1/3Nb2/3O (PMN) were calculated with first-principles frozen phonon methods. Nominal symmetries of the supercells studied are reduced by lattice instabilities. Lattice modes corresponding to these instabilities, equilibrium ionic positions, and infra…
Commercial wood flour, the most common wood-derived filler for thermoplastics, is produced in a mixture of particle sizes and generally has a lower aspect ratio than wood and other natural fibers. To understand how wood flour and fiber characteristics influence the mechanical properties of polypro-pylene composites, w…
The paper presents an electrodynamic analysis of tunable multiport ferrite-dielectric structures with parallel transmission lines of an arbitrary type, coupled through propagating magnetostatic modes of magnetized multilayered ferrite films. The structures are supposed to be excited at one port by an incident electrom…
Abstract The behaviour of fluid‐saturated solid foams can be very well described using multiphasic continuum mechanical models [4]. Concerning permeable soft foams, like e. g. gas‐filled open‐cell polyurethane (PU) foams, the transient compressive response is strongly influenced by the outstreaming pore‐fluid. Followi…
Article Refinement of the crystal structure of gallium oxide hydroxide, GaO(OH) was published on March 1, 2003 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 218, issue 1).
Gradual transition from quasi-hexagonal to quasi-one-dimensional order was experimentally observed in an arrangement of macropores etched on the surface of a Si(100) plate inhomogeneously strained by bending. The observed phenomenon is theoretically described within the framework of a defect-deformation mechanism of t…
A study of the temperature dependences of the ordinary and anomalous Hall coefficients and of the Hall mobility of carriers in single crystals of the ferromagnetic manganites La 1− x Sr x MnO 3 ( x =0.15, 0.20, 0.25) was carried out in the temperature interval from 85 to 400 K. The nature of the carriers and the condu…
The stress corrosion cracking (SCC) initiation and propagation behaviour of a longitudinally welded 304 austenitic stainless steel has been investigated in an aqueous solution of 1M NaCl + 0.5M HCl. The SCC in the base metal and heat affected zone (HAZ) initiates and propagates perpendicular to the applied tensile str…
Cation exchange capacity (CEC) is one of the fundamental properties of clays and provides a means for estimating the general chemical properties of clays. The ammonium acetate saturation and sodium saturation methods are commonly used for measuring CEC. However, both methods are experimentally quite difficult and time…
A review of mechanical sensing techniques based on magnetic methods is presented, with special reference to magnetoelastic strain gauges and force sensors. A novel strain sensor based on soft amorphous ribbons is described. Other types of magnetic sensors, for the measurement of torque and displacement are briefly dis…