Materials Literature
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New tribranched thermotropic liquid crystal compounds were synthesized and their liquid crystalline properties studied by differential scanning calorimetry, X-ray diffraction and polarizing optical microscopy. The compounds are the bis-{10-[4-(4-alkylphenyliminomethynyl)phenoxy]decyl} 2-[6-(cholesteryloxy)hexyl]malona…
Abstract The electronic structure of ZnSb2O6 is calculated by using the FLAPW method and the DV-Xα method. The valence band with the width of ca. 10.5 eV is roughly classified into the two bands, where O 2p orbitals are dominant and hybridize with Zn 3d and Sb 5s orbitals. On the other hand, the lower conduction band…
Older solid dielectric cables are now approaching the end of their life and failing. Consequently there has been a sustained effort for the development of techniques to assess the remaining life of in-service cables for the purpose of establishing replacement criteria. Because of the generally accepted belief that the…
ZnO thin films coated on plastic materials were investigated for their use in the protection against solar ultraviolet (UV) radiation. Using diethylzinc (DEZ) as the organic source material, we attempted to deposit ZnO thin films on polycarbonate (PC) resin at room temperature by the cathode deposition technique of th…
Soret-excited resonance Raman (RR) spectra are reported for some 40 nonplanar metalloporphyrin complexes. These include (i) copper β-octabromo-meso-tetra(para-X-phenyl)porphyrins, Cu [ Br 8 T (p- X - P ) P ] ( X = CH 3 , H , F , CF 3 , NO 2 ); (ii) copper β-octachloro-meso-tetra(para-X-phenyl)porphyrins, Cu [ Cl 8 T (…
We have analyzed the implications of [Mg] VI =>[Fe 2+ ] VI isomorphous substitution in the periclase structure (B1) which forms, under lithospheric P, T conditions, only very limited solid solutions with wustite. The crystallographic study (by single crystal X-ray structure refinements and microprobe analysis) support…
The properties of three polydimethylsiloxane (PDMS) membranes filled with crystalline zeolites and with amorphous SiO2, respectively, before and after sorption of organic solvents were studied by DSC. The PDMS crystallinity of the membranes with sorbed solvents is affected by both the solvent and the filler natures. F…
The effect that PbZrO 3 (PZ) addition to (Na 1/2 Bi 1/2 )TiO 3 (NBT) has on crystal structure, domain state, ferroelectric property and cation ordering was investigated. With increasing PZ concentration, lattice distortion of NBT decreased and the phase transition behavior became similar to that of relaxor ferroelectr…
Field tests on stainless steels have been carried out at five waste water treatment plants for one year. Three grades of stainless steel, i.e. AISI 304 (UNS S30400), AISI 316 (UNS S31600), and duplex 2205 (UNS S31803) were tested in the final settling tank in the plants. The time dependence of the open circuit potenti…
Single crystals of La 0.9 Sr 0.1 MnO 3 and La 0.8 Sr 0.2 MnO 3 manganites are examined using magnetic resonance in the temperature range 80–370 K. It is found that magnetostatic oscillations arise near the Curie temperature. The possible reasons for the appearance of additional lines in the ferromagnetic resonance (FM…
In the present paper, a model has been developed for the structure of an oxide layer obtained on aluminium as a result of the hard anodising process, which is widely used in industry. As a result of such processing, oxide layers with thicknesses within the range 30–100 µm (under certain conditions even up to 250 µm) c…
The production of industrial wood from natural forests is predicted to decline in the future. Factors that will contribute to this decline include changes in land use patterns, depletion of resources in some parts of the world, and the withdrawal of forest areas from industrial production in order to provide for envir…
New homologous symmetric dimers are presented in which two-ring monomers are connected by a flexible spacer and perfluorinated chains are introduced in terminal positions. The mesophase behaviour depends on the length and structure of the spacer and on the length of the terminal chains. The most interesting finding is…
Abstract Theoretical expressions based on Ohm's law for field theory were derived to measure surface resistivity of high‐resistance polymer films using parallel plate and concentric circular electrodes. Experimental measurements of resistivity were compared to experimental measurements using conventional expressions b…
We studied the collective elastic interaction in a system of many macroparticles embedded in a nematic liquid crystal. A theoretical approach to the interaction of macroparticles via deformation of the director field [1] is developed. It is found that the director field distortion induced by many particles leads to th…
The aim of this experiment is to grow a thin silicon layer (<50μm) by Liquid Phase Epitaxy (LPE) onto porous silicon. This one acts as a sacrificial layer in order to transfer the 50 μm epitaxial layer onto foreign substrates like ceramics. After transfer, the silicon wafer is then re-usable. In this work, we used the…
We demonstrated a method for measuring the quantum efficiency of deep UV emission using the two-step excitation and the difference of the integrated spectral intensities in Pr3+-doped CaAl4O7 and SrAl4O7 crystals. The quantum efficiencies of the emission from the lowest 4f5d state in the two systems have been estimate…
This is the second part of our study on needle heating in heavy industrial sewing. In this part, a finite element analysis (FEA) model is presented. Using a commercial FEA software system, ANSYS, the needle is modeled by a number of 3D bar elements and the sewing process is modeled by a series of time and space depend…
We describe an innovative yet straightforward method to obtain high quality thin sections of diatom exoskeletons for observation by scanning electron microscopy (SEM). The use of this new technique allows for clear observations of some ultrastructural valve features, including the raphe, which are generally difficult…
Dy3+-doped chalcogenide glasses are potential candidates for 1.3-µm optical-fiber amplifiers. We describe spectroscopic characterization of Dy3+-doped gallium lanthanum sulphide glasses with low and high oxide content. The spectroscopic investigations show that small amounts of oxide (∼1%) in low-oxide-content sulphid…