Materials Literature
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The morphology of the carbon nanocoils (CNCs) and their catalyst particles were characterized by a transmission electron microscope (TEM) to discuss the growth mechanism of CNCs. The catalyst particles of CNCs have many corner numbers on TEM images. This means that the catalyst particles of CNCs have several facets. I…
Newly prepared cellulose pelargonate samples of various molecular weights were studied in dioxane and chloroform solutions by isothermal translation diffusion, high-speed sedimentation, flow birefringence (Maxwell effect), electric birefringence (Kerr effect), and viscometry. The conformational, hydrodynamic, optical,…
Low processing temperature, homogeneity and high purity are the advantages one attains through hydrolysis and condensation of metal alkoxides to derive oxide glasses when compared with conventional melting techniques. An attempt was also made to explore the effects of varying the aging time of the gels to three years…
Article Crystal structure of aqua(biphenyl-2,4′-dicarboxylato)- manganese(II), Mn(H2O)(C14H8O4) was published on June 1, 2011 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 226, issue 2).
We report on the epitaxial growth, fabrication, and characterization of full-color InGaN/GaN dot-in-a-wire nanoscale LEDs on Si(111), which can exhibit an internal quantum efficiency of ~ 45% and negligible saturation up to ~ 300 A/cm2.
Abstract Cu-10Cr-0.4Zr alloy and in-situ composites based on the alloy were prepared. Microstructural evolution and mechanical properties of the Cu-10Cr-0.4Zr filamentary insitu composites were investigated. It was found that with the increasing of drawing strains from 2.1 to 6.2, the thickness of Cr filaments decreas…
Electrical conductivity of Cu nanowires varies with diameter of nanowires. However, keeping the diameter of nanowires constant, a variation in their electrical conductivity is observed after they irradiated with gamma rays and neutrons. On the basis of I‐V characteristics drawn at room temperature, decrease in the con…
New type of amide conjugates of steroid and bile acids with D-glucosamine 1 and 2 were prepared. Title compounds are prepared via acid chloride or using N-[({[(1E)-1-cyano-2-ethoxy-2-oxoethylidene]amino}oxy)(dimethylamino)methylidene]-N-methylmethanaminium tetrafluoroborate as condensation agent. They were examined fo…
A mathematical model of crack nucleation in a variable-thickness band (rod) under nonuniform heating is constructed. As the band (rod) is thermally loaded, pre-fracture zones are assumed to appear; these zones are modeled as regions with attenuated bonds between material particles. The presence of bonds between the pr…
An experimental method to determine the pairing symmetry in iron pnictides is theoretically proposed. We focus on two kinds of s -wave states, s +− - and s ++ -wave states, which are possible candidates for the pairing states of iron pnictides. For each state, we calculate both the density and spin response functions…
Considering the attractive interaction between two magnons with opposite wave vectors in a Heisenberg ferromagnet, we propose the model of magnon-pairs, which is suitable for low-temperature environment. A dressed magnon is an energy quantum of the magnon-pairs whose energy is a monotonically increasing function of ab…
The precipitation in the alloy Al-Mg system has been the subject of many theoritical and experimental investigations that have contributed to the understanding of the different mechanisms which control them. The purpose of this work is to clarify the effect of temperature on the mechanisms of these during ageing of Al…
The U.S. Department of Energy (DOE) and CH2M Hill Plateau Remediation Company (CHPRC) are seeking a waste treatment solution for sludge stored in the K-Basin spent fuel pond at the Hanford Nuclear Site, in Washington State, USA. This sludge is a Remote Handled Transuranic (RHTRU) waste destined for final disposal at t…
C60 nanowhiskers (C60NWs) were synthesized by liquid-liquid interfacial precipitation method (LLIP method), using m-xylene as a good solvent solution of C60 and isopropyl alcohol (IPA) as a poor solvent of C60. The growth mechanism of C60NWs was investigated by the long-term observations using optical microscopy. In t…
Two types of micro-mechanical memory cells are introduced in this paper. The programmable parameters are the resonant frequency of a micro-mechanical bridge and the tip deflection of a micro-mechanical cantilever. For both cases, the actuation was done by laser pulses that locally heated the vanadium dioxide (VO2) thi…
Dans cette thèse, nous avons étudié les propriétés optiques des supraconducteurs à base de fer dopés trous [ Ba1-xKxFe2As2 ] et électrons [ Ba(Fe1-xCox)2As2 ]. Dans les composés dopés optimalement par K ou Co, nous avons trouvé différentes réponses dans la conductivité optique de basse énergie. En comparant les propri…
The electrical properties of three un‐doped GaN samples grown at low pressure by Metal Organic Vapor Phase Epitaxy (MOVPE) on sapphire substrates are reported. Two different growth temperatures of 900 °C and 950 °C were used, for 90 min. Also, two trimethylgallium flow fluxes were set (5.39 μmole/minute and 8.39 μmole…
The subject of the article is the applicability of effective organo-mineral complex for composite cements production and admixtures with multicomponent composition to increase energyand resource saving while manufacturing from composite cements.
Parameters of vibrating gear for the chinks expansion, making the dominating impact on its operating mode are considered in the article. Optimum values of gear parameters are defined. Results of experimental researches by the definition of optimum parameters are presented.
Fly ash is a by product of the burning process at coal-fired power plant. Fly ash is obtained by electrostatic or mechanical precipitation from the flue gases of furnaces fired with pulverized coal. The current annual production of coal ash world wide is estimated around 600 millions tons, with fly ash constituting ab…