Materials Literature
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We present a theoretical discussion of the reversible parking problem, which appears to be one of the simplest systems exhibiting glassy behavior. The existence of slow relaxation, nontrivial fluctuations, and an annealing effect can all be understood by recognizing that two different time scales are present in the pr…
We make a detailed analysis of the exact relativistic core-shell models recently proposed to describe a black hole or neutron star surrounded by an axially symmetric, hollow halo of matter and in a seminal sense also galaxies, since there are massive shell-like structures—as, for example, rings and shells—surrounding…
In this work we have studied the hydrolysis of titanium tetrabutoxide (TTB) in butyl alcohol. The hydrolysis was carried out by adding H2O for a molar ratio water/alkoxide of 4. The hydrolysis has been followed by FT-IR spectroscopy, and the evolution of the Ti-O-C bands of the TTB molecule have been analysed. These b…
Classical theory of electrical conduction and conducting materials electron energy in solids electron emission semiconductor properties and materials magnetic phenomena and magnetic materials dielectric materials optical properties and materials thermal and thermoelectric properties superconductivity and superconducto…
A modified phenomenological model for Shape Memory Alloy (SMA) is presented for design of an SMA wire based rotatory actuator. In this model, the forward and reverse transformation functions are derived from two kinds of tests: standard tension test, carried out at constant temperature, and thermal cyclic test under c…
Thin SiO2 layers were exposed to an HBr/O2 plasma for a variety of short periods, reproducing the over-etching process after polycrystalline Si gate electrodes have been etched and the gate oxide layer is exposed. Samples were transferred under vacuum to an x-ray photoelectron spectrometer for analysis. After relative…
An evanescent wave ellipsometric technique is used to study the orientational wetting of ${4}^{\ensuremath{'}}$,4- alkylcyanobiphenyls $(n\mathrm{CB},n=5--9)$ at the interface with a series of self-assembled monolayers. Brewster angle measurements are interpreted in terms of a global orientational wetting phase diagra…
Electron paramagnetic resonance (EPR) has been used to characterize a new donor center in ZnGeP2 crystals. An equally spaced triplet of lines with a 1:2:1 intensity ratio is observed at g=2.0026 when a crystal is exposed to 633 nm light (below band gap) while at temperatures below 50 K. These EPR lines are approximate…
<div class="htmlview paragraph">Particulates (soot) were sampled from the regenerative trap of an automotive diesel engine run under three speed/load conditions. The fuel was doped with a cerium-based catalyst to promote oxidation of the soot bed. The soots were subjected to combustion testing in a DTG under bot…
A form of turbostratic boron nitride containing a large percentage of micrometre-size conically shaped particles was investigated by transmission electron microscopy. Electron diffraction patterns revealed the presence of correlations between adjacent boron nitride layers. The diffraction patterns were also used to de…
Regulation of protein kinase A by subcellular localization may be critical to target catalytic subunits to specific substrates. We employed epitope-tagged catalytic subunit to correlate subcellular localization and gene-inducing activity in the presence of regulatory subunit or protein kinase inhibitor (PKI). Transien…
Mössbauer spectroscopy is used to study the hyperfine magnetic fields at tin 119Sn ions introduced as an isomorphic impurity in the lattices of the orthoferrites RFeO3. The large reduction in the field H Sn hf (4.2 K) observed when R is changed from La to Lu correlates with the drop in the Néel point and indicates tha…
<div class="htmlview paragraph">Currently, 80% of European diesel passenger cars are turbocharged and as emission standards become more stringent exhaust gas recirculation (EGR) will be the primary means of suppressing oxides of nitrogen (NOx). The lighter the load the greater will be the combustion tolerance to…
In the band theory of ferromagnetism there is a relative shift in the position of majority and minority spin bands due to the self-consistent field due to opposite spin electrons. In the simplest realization, the Stoner model, the majority and minority spin bands are rigidly shifted with respect to each other. Here we…
The ditopic ligand 3 has been synthesized. In its deprotonated form, it reacts with copper(II) ions to form a tetranuclear complex 1 of the [2 × 2] CuII4 grid type, the structure of which has been confirmed by X-ray crystallography. Magnetic studies of complex 1 indicate a very weak antiferromagnetic coupling between…
A compact electron cyclotron wave resonance (ECWR) source has been developed for the high rate deposition of hydrogenated tetrahedral amorphous carbon (ta-C:H). The ECWR provides growth rates of up to 900 Å/min over a 4″ diameter and an independent control of the deposition rate and ion energy. The ta-C:H was deposite…
A radiochromic film extrapolation method is described for the measurement of surface dose from high energy photon beams. Extrapolated central axis entrance surface dose using Gafchromic film for a field size is and of for 6 and 10 MV x rays, respectively. Extrapolated surface dose for a field with a 10 mm perspex bloc…
A survey is given on analytical techniques currently applied to the surface characterization of biomedical polymers. The techniques include spectroscopies, thermodynamic and electrochemical measurements and microscopies, respectively. To illustrate the motivation for surface analysis, the hypotheses on the correlation…
We have proposed a micromachined system with the aim of controlling injection of DNA into cells. The injection system is composed of two components: hollow microcapillaries for injection and microchambers for trapping cells. The hollow microcapillary array, the most important part of the system has been fabricated. In…
Recent progress related to the investigation of infrared and microwave properties of the AgNbO3 and AgTaO3 single crystals and Ag(Ta,Nb)O3 ceramics is reviewed and discussed with the aid of new crystallographic considerations and symmetry approach. It is shown that optical phonons at any temperature contribute to the…