Materials Literature
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The thermal conductance of individual single crystalline silicon nanowires with diameters less than 30 nm has been measured from 20 to 100 K. The observed thermal conductance shows unusual linear temperature dependence at low temperatures, as opposed to the T3 dependence predicted by the conventional phonon transport…
Calcium carbonate has evoked interest owing to its use as a biomaterial, and for its potential in biomineralization. Three polymorphs of calcium carbonate, i.e. calcite, aragonite, and vaterite were synthesized. Three conventional bulk analysis techniques, Fourier transform infrared (FTIR), X-ray diffraction (XRD), an…
A new method, called Protonate3D, is presented for the automated prediction of hydrogen coordinates given the 3D coordinates of the heavy atoms of a macromolecular structure. Protonate3D considers side-chain "flip," rotamer, tautomer, and ionization states of all chemical groups, ligands, and solvent, provided suitabl…
In this paper, we discussed partial discharge (PD) inception characteristics and mechanisms of magnet wires for inverter-fed motor under repetitive surge voltage application. Experimental results revealed the relationship between PD inception voltage (PDIV) and parameters of applied surge voltage waveform. The relatio…
Sulpho groups have been successfully embedded in mesoporous silica with an ordered two-dimensional hexagonal structure. The sulpho-functionalized mesoporous silica was prepared by the oxidation of a thiol-functionalized mesoporous silica which was obtained via the hydrolysis and co-condensation of tetramethoxysilane (…
The complex [ mer -In(H 2 O) 3 Cl 3 ] · 18C6 (I) was isolated from the InCl 3 -H 2 O-Solv-18C6 solutions (Solv = MeOH, EtOH, THF). The second crystallization from mother solutions resulted in [ fac -In(H 2 O) 3 Cl 3 ] · 18C6 · 2H 2 O (II). The crystal and molecular structures of isomers I, II were identified by the po…
The crystallinities of bamboo-based carbon filaments have been examined by Raman spectroscopy as a nondestructive means of analysis of the historical lamp (ca. 1890s) manufactured by Ichisuke Fujioka of Japan, and the results have been compared with results from the study of Edison's lamp (ca. 1889) and replica lamps…
Abstract This chapter provides information on various contributors to failure of carburized and carbonitrided components, with the primary focus on carburized components. The most common contributors covered include component design, selection of proper hardenability, increased residual stress, dimensional stability,…
Composites of carbon nanofibres (CNF) (30–50 nm diam., length up to 1 µm) in two polymer matrices (polybutadiene‐styrene and polypyrrhol) show strong non‐linearities of conductivity vs. CNF concentration. We have studied their voltage‐current dependencies, and observed correlation of their extrema and layer morphology…
The electrical properties of silver films, prepared using a low-curing-temperature metallo-organic-decomposition (MOD) paste and a high-temperature silver paste screen-printed on polished and nonpolished alumina substrates, at microwave frequency were characterized in this study. Surface resistance and effective condu…
Catalytic oxidative modification of single-stranded DNA with hydrogen peroxide and molecular oxygen in the presence of a conjugate containing an oligonucleotide complementary to the DNA fragment and tetra-4-carboxyphthalocyanine Fe(II) was studied. The conjugate examined was found to be active in the reaction of oxida…
Abstract Porous metals and metallic foams are presently the focus of very active research and development activities. There are currently around 150 institutions working on metallic foams worldwide, most of them focussing on their manufacture and characterisation. Various companies are developing and producing these m…
This paper reports that hexagonal-phase LaF 3 :Yb 0.20 3+ , Er 0.02 3+ and LaF 3 :Yb 0.20 3+ , Tm 0.02 3+ nanocrystals (NCs) were synthesized via a hydrothermal method. The transmission electron microscopy, selected area electron diffraction, powder x-ray diffraction, and thermogravimetric analysis are used to charact…
This paper proposes a method to diagnose the aging of model stator bars. Experiments have been performed in such bars, and the maximum partial discharge has been recorded as the applied voltage increases and then decreases. The resulting ldquohysteresisrdquo curve shows whether the stator bar is in a ldquogoodrdquo or…
The authors report optical properties and interband-transition critical-point energies of bulk BaTiO3 (001). Room-temperature pseudodielectric function spectrum ⟨ε(E)⟩=⟨ε1(E)⟩+i⟨ε2(E)⟩ from 1.5to5.2eV has been measured by spectroscopic ellipsometry. In order to obtain the best approximation to the intrinsic dielectric…
Europium-doped yttrium–silicon–oxide–nitride phosphors are synthesized by carbothermal reduction and nitri-dation method. The crystal structure of the phosphors changed gradually from oxide Y 2 Si 2 O 7 to nitride YSi 3 N 5 state with increasing dosage of Si 3 N 4 and carbon powder. The Y 2 Si 2 O 7 : Eu phosphor show…
(100)-oriented MgO thin films can be effectively grown at a substrate temperature of room temperature (RT) on Fe seed layers by the facing-targets sputtering (FTS) method. Pt(100) orientation was observed when the Pt layer was deposited on MgO(100)/Fe buffer layers at a substrate temperature above 350 °C. Pt thin film…
The influence of preirradiation with an electron beam from a linear resonance electron accelerator in flowing argon on the structure and properties of the 1% Pt/H pentasil catalyst was studied. The support structure was studied by x-ray diffraction and low-temperature nitrogen adsorption. No changes in the crystal str…
A highly doped template of porous anodic alumina with carbon atoms content up to 40 per cent or even more was prepared for the first time by electrochemical aluminium anodization in aqueous malonic acid solutions, containing the arsenazo I chelating agent.
Coordination interactions between 5,10,15,20-tetrakis(3-hydroxyphenyl)porphyrinatozinc(II) and transition metal chlorides [La(III), Mn(II), Cr(III), Sn(II)], 1,4-diazabicyclo[2.2.2]octane, and 4,4′-bipyridine were studied. Self-assembly of supramolecular bis-porphyrin structures was developed.