Materials Literature
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Polyimides obtained from dianhydrides and diamines by the polycondensation are classified into four distinct categories according to the chemical structure of the monomers. Aliphatic polyimides derived from aliphatic monomers are soluble in organic solvents and form the colorless and flexible films, whereas most of fu…
To obtain the new idea on the improved optimum composite material structures, the fore-wing structures of Allomyrina dichotoma and Prosopocoilus inclinatus have been investigated using scanning electron microscopy. As a result, the structural characteristics of the fore-wing of beetles are made clear and some new know…
The power loss characteristics of Mn-Zn ferrites were observed up to 1 MHz at 25 mT as a function of temperature. At 100 kHz the temperature at which the power loss minimum occurred was near 70/spl deg/C, at 500 kHz 50/spl deg/C and at 1 MHz even lower. The contribution of eddy current loss to the temperature dependen…
In this paper a study of the temperature-dependent luminescence properties of europium-doped yttria-stabilized zirconia (YSZ: Eu) powder are presented with a view to evaluating the potential of this material and lanthanide-doped YSZ generally for temperature measurement in the thermal barrier coating systems used in g…
The chemical bond in ferroelectric ABO3 perovskites has been considered as a mixed ionic-covalent one. The effect of covalency on the structure has been analyzed using valence bond theory. A particular attention has been paid to the π bond formation and resulting distortion of the lattice. A role of two ferroelectrici…
The feasibility of using sculptured thin film technology to engineer multiphase low-permittivity (also called low-k) materials for microelectronic and electronic packaging applications is established via a numerical study. The chosen films are theoretically modeled as multiphase, uniaxial, dielectric nanocomposite mat…
The crystal properties of α-quartz type GeO2 were studied ia lattice energy minimization calculations using shell model and Buckingham potential.
A Knudsen-cell mass spectrometric technique was used to study a composition of saturated vapour over terbium and thulium trichlorides. For the first time the various neutral (LnCl 3 ) n and charged Cl - (LnCl 3 ) n (Ln = Tb, Tm, n = 1-8) species have been found in the temperature range between 900 and 1100 K. The part…
Polymerization of butene-1 (B-1) was carried out with a PP-TiCl3/Et2AlCl/methyl methacrylate (MMA) catalyst system in n-heptane. The influence of temperature, pressure, time and H2 on molecular weight, isotacticity, and catalytic activity were studied by viscometry, solubility in boiling diethyl ether, and measuring t…
An important parameter for the insulation capability of rigid polyurethane foam is the thermal conductivity of the nonporous polyurethane. This work focuses on ways to produce nonporous polyurethane materials and to determine their thermal conductivity. Additionally, the influence of the dissolved blowing agent, the f…
Nanomedicine is the medical application of nanotechnology. Nanomedicine is defined as the monitoring, repair, construction and control of human biological systems at the molecular level, using engineered nanodevices and nanostructures. Nanomedicine ranges from the medical applications of nanomaterials to nanoelectroni…
Phase stability and mechanical properties of Ti-Zr based alloys containing Nb as β stabilizer were investigated. Phase stability of annealed and quenched alloys with various Nb concentration were examined by optical microscopy and X-ray diffractometry while mechanical properties of the alloys were evaluated by hardnes…
We examined algal flora in the aquatic system of Devils Hole, Nevada. The water is seasonally warm, near neutral in pH, and rich in dissolved carbonate, indicative of deeply circulating groundwater flowing through carbonate rock. Most algae were benthic, with only a few planktonic representatives. Eighty-four terminal…
Worldwide, in industry, in business and in the home, metals called stainless steels are used daily. It is important to understand what these materials are and why they behave the way they do. This is especially true because the word “stainless” is itself somewhat of a misnomer; these materials can stain and can corrod…
Polyhydroxyalkanoates are biodegradable, linear polyesters produced primarily by bacteria. Present study reports production and characterization of polyhydroxybutyrate from Bacillus cereus isolated from polluted water sample. The study investigated effect of carbon & nitrogen sources and process parameters like in…
We have studied the Fourier transform Infrared (FT-IR) and the Fourier transform Raman (FT-Raman) spectra of a well– barrier– well thiophene-based oligomer oxidized with dry iodine vapour. These new data, when combined with the full vibrational assignment of the oligomer in the neutral state, provide a complete spectr…
The objective of this study was to relate potentially mineralizable soil nitrogen (N) obtained by means of long-term aerobic incubations (No), with nitrogen mineralizated using more rapid and simple methods such as KCl digestion (Nq) and short-term anaerobic incubations at 40 oC (Na). A preliminar experience, carried…
Certification tests in accordance with the requirements of the recent IEC 61259 standard for switching of bus-charging current by disconnecters of a (three-phase enclosed) 145 kV gas insulated switchgear (GIS) are described. These tests are primarily aimed at verifying that the discharge between the disconnector conta…
Replication of surface relief microstructures into COC (cyclic olefin copolymers) plastics using a hot embossing technique is considered. The replication accuracy has been investigated by optical characterization and scanning electron microscopy (SEM) of the replicated surface profile, which is a diffractive anti-refl…
Crystals of Gly·H3PO3 with various degree of deuteration were grown and their physical properties were investigated. Anomalies of permittivity related to para- ferroelectric phase transition were observed in the whole range of deuterium content. Ferroelectric character of the observed phase transitions was confirmed f…