Materials Literature
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The ionic conductivity and crystal structure of PbF 2 doped with high concentrations of KF, RbF and CsF have been investigated at elevated temperatures using complex-impedance spectroscopy and powder neutron diffraction. In the case of (PbF 2 ) 1- x -(KF) x , a high-temperature superionic phase with a body-centred-cub…
Electrical transport properties of polycrystalline ceramic specimens of the system ( x = 0.05, 0.10, and 0.15) have been investigated as functions of temperature by means of complex-plane impedance analysis, dielectric properties, four-probe dc conductivity, Seebeck coefficients, and magnetic susceptibilities. The typ…
It is pointed out that two, approximately `universal', dimensionless major characteristics of the sound velocity in liquid metals are also shared by the hard-sphere system as intrinsic properties of that simple model.
A capacitive sensor based on the theory of electric field measurements using floating electrodes has been developed for the measurement of VFTO and the same has been fitted to the metallic enclosure of a 145kV gas insulated substation (GIS) experimental test setup available in the laboratory. The sensor has been calib…
The use of sterically stabilized poly(ethyleneglycol)-coated liposomes (PEG-liposomes) is becoming increasingly important and several preparations based on long-circulating liposomes are already commercially available. From a clinical point of view, it is of importance to study the effect of multiple i.v. administrati…
Pepsin-solubilized elastin (PSE)-conjugated collagen film was prepared from a collagen matrix with PSE by drying it and crosslinking the constituents with water-soluble carbodiimide or microbial transglutaminase to improve the physical properties of the collagen film. The crosslinking reduced the solubility and improv…
The Heat Stress Index was an early model for the assessment of heat stress. The International Organization for Standardization (ISO) standard for required sweat rate is the current generation of heat balance methods for occupational heat stress. The method assumes cotton clothing and works adequately for cotton/polyes…
The magnetic anisotropy constant K1 and anisotropy field HA of M-type Sr-ferrite containing La and Co (Sr0.7La0.3Fe11.7Co0.3O19) were investigated by the singular-point detection (SPD) method using a pulsed field and SQUID magnetometers, and also by torque measurements. The value of HA=22.2 kOe was obtained by the SPD…
Metal- and ligand-based luminescence, absorption and circular dichroism difference spectroscopy signal the extent and nature of binding of enantiopure Δ and Λ cationic lanthanide complexes to [(CG)6]2 and [(AT)6]2.
The first example of an O-bound sulfinate diimine nickel(II) complex has been isolated from the partial oxidation of Ni(bpy)(bdt) 1 (bpy = 2,2′-bipyridine, bdt = 1,2-benzenedithiolate), and characterized by X-ray crystallography and ESI-MS.
The microstructural evolution during the equal channel angular (ECA) pressing process of an α+θ′ two-phase Al-1.7 at%Cu alloy has been studied by transmission electron microscopy (TEM). The θ′ precipitates are severely deformed after the first pass of ECA pressing that gives rise to a strain of ε∼1. After 8 passes of…
Este trabalho focaliza a obteno de um novo nanocompsito, formado mediante a polimerizao in situ de monmeros de pirrol na superfcie dos poros de vitrocermicas porosas com esqueleto LiTi2(PO4)3, aps troca-inica com cobre. This work is concerned with evidences of a new composite system, formed by in situ polimerization o…
Irradiation of a ferroelectric S C * liquid crystal phase induced by the photochromic dopants (R,R)-6,6′-bis(2-octyloxy)-5,5′-dinitrothioindigo and (R,R)-5,5′-dichloro-6,6′-bis(2-octyloxy)thioindigo at λ=514 and 532 nm, respectively, causes an increase in spontaneous polarization (P S ) by a factor ranging from 1.4 to…
We report on the optimization of synthesis, solubility and crystal growth from solution of 2-amino-5-nitropyridinium l-tartrate (labelled 2A5NPLT). This newly engineered guest-host hydrogen-bonding salt exhibits a quasi-perfect polar alignment of the nonlinear chromophores in the crystalline lattice which is promising…
The E-field dependence of piezoelectric properties of rhombohedral single crystal PZN-4.5%PT were investigated as a function of crystallographic orientation. For <111> oriented crystals, crystal partial depoling and subsequent domain reorientation results in a peak in dij vs. E-field curves at −5kV/cm, followed by non…
Pd/γ-Al2O3 catalysts modified by cerium or lanthanum oxide were prepared according to a standard procedure. The nature of the interaction between the metallic particles and the promoted support was addressed. The effects of changing the following parameters were studied: (i) precursor palladium salt (chloride or nitra…
Optical fibres that are permanently installed in nuclear reactors (fission or fusion) or at high energy physics accelerators can accumulate considerable long-lived radiation-induced loss. Four different fibre types were irradiated up to dose values from 10/sup 3/ to 10/sup 6/ Gy and an attempt was made to reduce the r…
A chiral, nonracemic dendrimer of generation two based on aromatic bis- and tris-amino acids has been synthesised.
We describe the set-up of an energy-dispersive reflectometer installed at the 6 T wavelength shifter (WLS) of the storage ring BESSY-I. It can be used for reflectometry and in-plane diffraction studies of thin films under ambient conditions. Due to the exponential decay of the incident spectrum, the whole useful energ…
Abstract Copper(II) pivalate adduct with triethylamine, [Cu2(piv)4(Et3N)2] (Hpiv = pivalic acid), and cyclic hexanuclear copper(II) complex, [Cu6(piv)6(EtO)6], have been synthesized and characterized by X-ray crystallography and magnetic susceptibility measurement.