Materials Literature
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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…
The parent bis[1,2]dithiolo[1,4]thiazine-3,5-dione 8, -3,5-dithione 11, the unsymmetrical 3-oxo-5-thione 10 and the bis[1,2]dithiolopyrrole-3,5-dione 9 are synthesised by acid catalysed cleavage of their various N-benzyl, ethyl, ethoxycarbonylethyl and propanoic acid derivatives. These N-alkyl compounds are prepared i…
The elastic, piezoelectric, and dielectric characteristics of α-GeO 2 crystals are studied at room temperature. The measurements were performed by the resonance method on crystals grown on α-quartz seeds from solutions in the recirculating mode. In germanium dioxide crystals, the piezoelectric moduli have high values.…
This series of papers is based on an anthropometric survey conducted on 618 female Kenyan children aged from two to six years. Part I discusses the procedures in which correlation coefficients of 33 parameters were analysed, resulting in a centilong system based on height, outside leg, chest, and hip as key dimensions…
The effect of z value on the high temperature performance of Sm(Co/sub 0.795/Fe/sub 0.09/Cu/sub 0.09/Zr/sub 0.025/)/sub z/ with effective z=7.14-8.10 was studied up to 600/spl deg/C. It was observed that the intrinsic coercivity (/sub M/H/sub c/) was very sensitive to the z value, especially when the temperature was l…
Fatigue tests at 600°C in air were performed on U-notch specimens of wrought IN718, using l-l-l-l and 1-20-l-l trapezoidal cycles. SEM examination and acetate replication was used to study crack initiation andgrowth. In support of the fatigue tests, thermal exposure experiments were performed on unstressed specimens t…
Single stroke hot deformation process was introduced for the first time in this study. A high performance anisotropic NdFeB magnet was fabricated by this new method from MQPA ribbon powder. Principal factors that influenced hard magnetic properties, temperature and deformation percentage, were investigated. Under opti…
Data relating to the ZnO/ZnCl2-accelerated vulcanization of chlorinated poly(isoprene-coisobutylene) (CIIR or chloro-butyl) is examined. ZnCl2 and conjugated diene butyl units on the polymer chain are both precursors to crosslinking, and a revised cationic mechanism is proposed to account for crosslinking, taking into…