Materials Literature
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From first-principles, the electronic and elastic properties of alkali-metal sulphides (Li 2 S, Na 2 S), with emphasis on the plane-wave pseudopotential method and the inclusion of the non-linear core correction for exchange and correlation have been investigated. At ambient condition, these compounds are found to cry…
W 18 O 49 nanowires exhibit stable field emission at low fields. To explore the potential application of such nanowires in backlight and display devices, it is necessary to achieve uniform emission on a large area. In the present study, the authors demonstrate that field-emission uniformity of large-area samples may b…
We have experimentally studied the transport properties of a planar La0.7Sr0.3MnO3 (LSMO)/Mn-depleted LSMO/MnSi tunneling structure, in which the Mn-depleted LSMO layer plays the role of a potential barrier between the conducting layers of LSMO and MnSi. The measurements were performed in geometry with the current dir…
Crystals of a new compound with a superprotonic phase transition Cs2(HSeO4)(H2AsO4), have been synthesized for the first time by a slow evaporation method at room temperature. The structure was solved by a three-dimensional Patterson function and refined to R1=0.0309 and WR2=0.0482 on the basis of 2062 unique observed…
We report on the optical and magnetic properties of Co doped ZnO nanocrystals (NCs). With surface capping treatment by TOPO, the Co doped ZnO NCs show ferromagnetic ordering even at room temperature, while the NCs without the capping treatment show paramagnetic. We compared the photoluminescence (PL) properties betwee…
The results of ultrasonic action to the substances have been presented. It is examined, the correlation between the electrical parameters of ultrasonic equipment and acoustic performances of the ultrasonic field in treating the medium, the efficiency of ultrasonic technological facility, and the peculiarities of oscil…
Open air freshwater hydrocanals in Tarraleah, Tasmania, Australia, exhibit significant diatom biofouling which leads to economic losses in hydroelectricity generation. These fast-flowing (flow velocity 2 m s−1) canals produce between 2 and 18 tonnes dry weight of fouling and 1–5 mg chlorophyll a/m 2 over a 20 km long…
The structural, magnetic and electronic properties of transition metal oxides reflect in atomic charge, spin and orbital degrees of freedom. Resonant x-ray scattering (RXS) allows us to perform an accurate investigation of all these electronic degrees. RXS combines high-Q resolution x-ray diffraction with the properti…
Abstract Based on the synthesis of a rigid aromatic diamine, α , α ‐bis(4‐aminophenyl)‐4‐( t‐ butyl)toluene ( 1 ), a novel polyimide (PI) 3 was prepared from this diamine monomer and 4,4′‐oxydiphthalic dianhydride via a one‐step high‐temperature polycondensation. FT‐IR, 1 H NMR and elemental analysis were used to inve…
This work presents an experimental procedure to verify if a model of vector hysteresis, the DPC model (Della Torre, Pinzaglia, Cardelli), based on the Preisach theory, can be identified for a given material. The identification can be achieved only if the material has a magnetic behavior in agreement with the propertie…
We describe here a novel hybrid organic/inorganic nanocomposite of hexahexyloxytriphenylene (HAT6) which is a columnar discotic liquid crystal and gold tetrachloride, an inorganic dopant, showing enhanced dc and ac electrical conductivity by several orders of magnitude at ambient conditions vis-à-vis the respective pu…
The physical principles are considered of on-chip interconnection degeneration and failure in sub-1-µm technologies from the viewpoint of multilevel-metallization reliability. A general theory and simulation results are presented that deal with electromigration-induced failure of thin-film conducting tracks on the mic…
The iron compounds resulting from the impregnation of the most common supports—alumina and silica gel-with an aqueous FeSO 4 · 7H 2 O solution and subsequent heat treatment in air are identified by thermal analysis and Mössbauer spectroscopy. The state of the active component of the iron-containing catalysts depends s…
We investigate the local structural change under antiferro- and ferromagnetic transition for annealed Fe 50.4 Rh 49.6 alloy. Both Fe and Rh K -edge EXAFS are analysed up to second nearest neighbours. For first nearest neighbour Fe-Rh (or Rh-Fe), the temperature dependence of the interatomic distance and Debye-Waller f…
We present results of tight binding calculations demonstrating existence of degenerate electronic shells of Dirac fermions in narrow, charge neutral graphene quantum rings. We predict removal of degeneracy with finite magnetic field. We show, using a combination of tight binding and configuration interaction methods,…
Ground tyre rubber (GTR) was blended with waste polypropylene (WPP) in nine different compositions to prepare GTR/WPP blends. The blends were prepared in a Haake Rheocord PolyLab system at a temperature of 180 °C and a rotor speed of 30 r/min for 8 min. The processing characteristics of the blends showed an increase i…
One of the main reasons for using nonceramic insulators in polluted regions is the reduction of maintenance needed to keep a line in service. Because the useful lifetime of these insulators depends largely on the pollution conditions, it is advisable to inspect the insulators on a regular cycle. The article discusses…
The authors developed an experimental method that can measure the in-plane thermal conductivity of a thin film and the interface thermal conductance between the film and the metal strip, simultaneously. This technique, the in-plane 3ω method, can be applied to the films with very high thermal conductivity such as diam…
Flammability of peroxide vulcanizates of acrylonitrile-butadiene rubber NBR 18, containing various flame retardants has been determined by thermal analysis (Table 1, Fig. 1-5). A clear relation between thermal decomposition rate of cured elastomer and its flammability, determined as oxygen index OI and combustion time…
This study investigates Cu isotope ratio variations in the high-grade, vein-type Cu-Ag deposit of Dikulushi, Democratic Republic of Congo. The Dikulushi deposit consists of a Cu-Pb-Zn-Fe mineralization, comprising sphalerite, chalcopyrite, bornite, and chalcocite that precipitated under reducing conditions. This miner…