Materials Literature
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The Curie temperature of rare-earth Co intermetallics is investigated by self-consistent spin-polarized electronic-structure calculations on Y-Co compounds. The total exchange interaction of a given site with all other sites (J/sub o/) is calculated by the linear-muffin-tin-orbital method using the local force theorem…
Abstract Poly( L ‐lactide‐co‐β‐malic acid) was obtained after the hydrogenolysis of the copolymer of L ‐lactide (L‐LA) and β‐benzyl malate (MA). 1 H‐NMR demonstrated that the composition of the copolymer was identical to the feeding dose. Thermal property study revealed the morphology of the copolymer could be changed…
Abstract The syntheses of a series of novel tetrathiafulvalene derivatives substituted with four side‐chains terminating in hydrophilic amidoalcohol (arborol) groups are reported, for example the tetrathiafulvalene derivative 15 . Some of these arborol derivatives formed thin films by spin‐coating from methanol soluti…
Abstract. Three molecular theories are used to prediet the yield behavior of amorphous polymers for a wide range of temperatures and strain rates. These include the state transition theory of Ree-Eyring, the conformational change theory of Robertson and the disclinations theory of Argon. For each of these models, the…
The capacity of temperature modulated differential scanning calorimetry (TMDSC) technique to determine dynamical parameters is tested on several glass-formers of different fragility. We show that both the fragility index m and the stretching exponent β deduced from TMDSC are consistent with results from other spectros…
Plasma pressure consolidation (PPC) was used to synthesize exchange coupled composite magnets. The magnets were processed from a mixture of micrometer-size, anisotropic magnetically hard SmCo/sub 5/ and nanometer size magnetically soft Fe particles. High density magnets were obtained by PPC at a temperature as low as…
A Pb/sub 1-x/Lax(Zr/sub y/Ti/sub z/)/sub 1-x/4/O3(PLZT) electrooptic ceramic variable-rotatable waveplate and a compact inline polarimeter have been used to develop a fast feed-forward-controlled module for the continuous and complete conversion of polarization. This requires the control of only two parameters: the di…
Using the epilithic diatoms as indicators of environmental conditions, 10 lakes in the High Tatra Mountains were characterised with regard to their stage of acidification. The diatom communities were diverse; 210 taxa were found, including 27 species of north and alpine preference. On the basis of cluster analysis, tw…
A combination of increasingly stringent environmental legislation and economic competition is driving industrial processes further and further towards the three “E”s of chemical manufacture: economy, efficiency and environmental impact. In this paper, we present a novel aqueous method for the synthesis of polyimides.…
In attempts to bridge the complex [W(CO) 3 (phen)(pyz)] (phen = 1,10-phenanthroline; pyz = pyrazine) to acceptor centers, either soft centers such as cis -M(CO) 2 Cl (M = Rh(I), Ir(I)) and fac- M(CO) 3 Cl 2 (M = Ru(II), Os(II)) or hard centers such as BF 3, the pyrazine ligand is lost, while the fragment W(CO) 3 (phen…
The drain current-voltage (I-V) characteristics of Schottky-barrier carbon nanotube field-effect transistors (FETs) are computed via a self-consistent solution to the two-dimensional potential profile, the electron and hole charges in the nanotube, and the electron and hole currents. These out-of-equilibrium results a…
The scalar Preisach model of hysteresis is extended to the isotropic vector case by introducing a new type of elementary vector Play operators. The new isotropic vector hysteresis model can reproduce with reasonable accuracy the qualitative behavior of magnetic vector hysteresis in isotropic materials and is rather fa…
ABSTRACT: Films were formed from heated whey protein isolate (WPI) solutions (heated [H] films) and from unheated WPI solutions following adjustment to pH 11, with subsequent readjustment to pH 7 (unheated, readjusted [UR] films) or without readjustment to pH 7 (unheated, unadjusted films [UU] films). UU and UR films…
In this paper, we will discuss the use of the Lorentzian function as a possible candidate for the accurate approximation of the Preisach function in the modeling of scalar hysteresis for nonoriented grain steels. In particular we discuss here the identification procedure of the parameters of the function from measured…
Abstract Nonlinear optical vinyl polymers with high glass transition temperature ( T g ) were prepared by the functionalization of a fluorinated acrylate‐methyl vinyl isocyanate copolymer. A modified pathway to obtain a thiophene bridged chromophore was worked out. Poled films of the polymers show a fairly high and st…
This work presents the experimental results of the facing turning of an Al-Mg alloy. This aluminium alloy was mechanically and metallurgically modified, by means of cold rolling reduction and refining grain size previous to machining. The samples were cut and compared with samples in the as-received form, machined und…
Precipitation, growth, and coarsening of Si 3 N 4 crystals in (Si,Al,Mg,Y)(O,N) liquids at 1680°C has been studied. The initial nucleation of β‐Si 3 N 4 occurs mostly on α‐Si 3 N 4 because of the very high supersaturation of the liquid. After a brief period of growth, the crystals then undergo accelerated coarsening,…
The corrosion of aluminium in 1M HClO4 at 40° C has been investigated using the potentiodynamic polarisation technique. The effect of various inorganic additives has been investigated. It was found that NO3-, NO2- and SCN- anions exhibit an inhibiting action on acid corrosion of aluminium by reducing the general corro…
Surface potential of the H-terminated and locally oxidized diamond surfaces is investigated by Kelvin probe force microscope. Potential of H-terminated diamond surface is observed to be ∼0.1 V higher than that of oxidized diamond surface. Surface potential difference is attributed to the surface charge induced by the…
PURPOSE: For the effective internal radiation therapy of i.p. disseminated tumors, we developed avidin (Av)-dendrimer-chelate complex, which can be labeled with indium-111, emitting Auger and conversion electrons, with very high specific activity, and we studied its internalization, biodistribution, and therapeutic ef…