Materials Literature
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Zinc oxide (ZnO) nanorod arrays were fabricated on ZnO:Al seeded Si substrates with various reaction temperatures using a low temperature hydrothermal method. The morphology and structure of ZnO nanorod arrays were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). It reveals that the ZnO…
A modified coaxial electrospinning process is developed for producing thinner zein nanofibers. With ethanol aqueous solutions as sheath fluids, high quality zein nanofibers have been successfully generated using the modified process. Electron scanning microscope results demonstrate that the nanofibers have better qual…
Abstract C10H11MnN3O7, orthorhombic, Pna21 (no. 33), a = 7.861(6) A, b = 10.337(8) A, c = 15.92(1) A, V = 1293.5 A3, Z = 4, Rgt(F) = 0.0481, wRref(F2) = 0.1313, T = 296 K.
We report the synthesis of phosphorus-doped (P-doped) and undoped ZnO nanostructures using a thermal evaporation and vapor transport on Si(100) substrate without any catalyst and at atmospheric argon pressure. The structural and optical properties of P-doped ZnO nanostructures and undoped ZnO nanostructures have been…
Abstract Hauptgruppenelemente: Neue Synthesestrategien, ungewöhnliche Bindungssituationen und vollständige katalytische Kreisprozesse — Koordinationschemie: Gold als überraschendes Element und metallhaltige, supramolekulare Systeme gewinnen an Komplexität — Bioanorganik: Mechanismen von Metalloenzymen und Aktivierung…
Charge ordering (CO) in Bi 1− x Ca x MnO 3 ( x = 0.4–0.6) has been investigated by temperature-dependent high-resolution neutron powder diffraction (NPD), X-ray powder diffraction (XRD) and physical property measurements. Anomalies in magnetization, resistivity and lattice parameters have been observed around the CO t…
Based on micromechanics, an elastic-plastic-brittle damage model of concrete beam strengthened by bonded steel plate is proposed by considering the aggregate gradation curve algorithms and the heterogeneity. In this model, the concrete beam strengthened by bonded steel plate is taken as a five-phase composite material…
Great efforts are presently being undertaken to develop fuel cell applications. In this study, a design and realization of a fuel cell test station is described. The control of the stack temperature and the optimization of some parameters, such as the acquisition and equilibrium time for each value of the current dens…
The generation of acoustic and vortex oscillations in high-temperature superconductor (HTSC) powders excited by radiofrequency (rf) pulses was analyzed in detail in our earlier publications. The rf magnetic field stimulates oscillations of magnetic vortices on the surface of an HTSC grain, which are transformed into l…
Coatings of La1−x Sr x MnO3 (x = 0.225) with thicknesses of 6 and 1000 nm are deposited by magnetron sputtering on LaAlO3 substrates and the electromagnetic properties of obtained films are studied in detail. It is found that the colossal magnetoresistance observed in the samples is considerably influenced by interfac…
Cu/MgB2 composites with different content of MgB2 (10, 20, 30 vol.%) were fabricated by vacuum sintering of copper and MgB2 powders. The effects of MgB2 content and sintering process on the properties of Cu/MgB2 composites including the microstructures, relative density, electrical conductivity and hardness were then…
To investigate the fatigue property of carbon structural steel in theory, the microstructure and properties of quenched martensite must be studied in detail. In this paper, the electronic structure and mechanical properties of carbon structural steel in quenched state were calculated by the empirical electron theory o…
BCNO nanomaterials were obtained by mixing charcoal with boric acid and urea, and then heat treated at high temperatures. Their microstructures and electromagnetic parameters were characterized and discussed. TEM analysis revealed the analogues of few-layered graphenes after doption. Aditional ammonia treatment was al…
In this paper , the ZnO crystal was synthesized using hydrothermal method through 24 hours'reaction with 35 % filling factor at 430°C. When the mineralizer concentration is rather low (eg. lmol/L NaOH), only ZnO microcrystal is produced. The mineralizer concentration increases, the larger crystal was present. When 5 m…
By applying appropriate quenching–partitioning–tempering (Q–P–T) processes, proposed by T. Y. Hsu (Xu Zuyao), new types of low carbon high strength steels with adequate plasticity and toughness can be obtained () In this work, the effects of tempering parameters on the microstructures and mechanical properties of Q–P–…
Empirical formula can be used to get ground shock parameters produced by conventional weapons buried in soil medium. With the development of finite element technology, ground shock parameters can be obtained by numerical simulation. However, sometimes the numerical simulation results were not consistent with the empir…
A non-vacuum process for fabrication of polycrystalline CuIn(Se,S)2 (CISS) thin films with chalcopyrite structure were synthesized by sol-gel spin-coating method using nitrates as precursor for low-cost photovoltaic applications. Sequential reduction, selenization and sulfurization treatments were performed with hydro…
The walls along the walkway leading to Shanghai's Guilin Garden are lined with geometric panels. The following questions refer to the wall panels shown in photographs 1–8. When answering these questions, assume that the patterns continue in all directions.
Associer semi-conducteurs et supraconducteurs est une idée a priori surprenante, tant les propriétés électroniques de ces deux états sont opposées. Néanmoins, le couplage entre les électrons et les modes de vibration du réseau atomique, à l’origine de la supraconductivité conventionnelle, peut être très fort dans les…
The crystallographic structural characteristics and magnetic properties of Ho3Fe29-xTx (T=V and Cr) compounds have been investigated by using Rietveld refinement analysis of X-ray diffraction (XRD) pattern and magnetic measurements. The calculated results indicate that among the 11 different kinds of Fe sites in these…