Materials Literature
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Sintered metal compositions are used in many applications, including shells of explosive warheads. The properties of the compositions depend on both the base materials and the fabrication process. In order to achieve specific strength and fragmentation properties under dynamic loading, these parameters need to be opti…
Magnesium oxide nanoballs with of 80–100 nm diameters were synthesized by chemical precipitation. The precursor magnesium hydroxide was prepared from dolomite ore as a raw material which was immersed in hydrochloric acid and then reacted with ammonium hydroxide without any surfactant. The effects of calcination temper…
This paper deals with long fiber-reinforced composite strands using continuous ramie yarns, in which polypropylene including MA-PP (maleic anhydride-grafted polypropylene) was used as a matrix material. The composite strands were fabricated by a new method called multi-pin-assisted resin impregnation (M-PaRI) process,…
Fully dense nanocrystalline ceria films were successfully deposited on a MgO single crystal by pulsed laser deposition (PLD). The electrical conductivity of the nanocrystalline thin film was 20 times higher than that of the bulk sample. The activation energy of bulk ceria was 2.3 eV, whereas the activation energy of t…
Highly ordered supermicroporous aluminosilicates with cubic Pm3n symmetry were prepared for the first time in weakly acidic solutions of succinic acid and malonic acid using dodecyltriethylammonium bromide as a template. The polycarboxylic acids acted as auxiliaries for fabricating the cubic Pm3n structure as well as…
从实验及模拟角度对比研究了引晶段的晶粒密度和取向随晶粒生长高度（研究位置距试样底面的高度）的变化规律，并给出了引晶段参数的设计准则．采用EBSD晶体取向成像技术获得了引晶段截面的晶粒形貌和取向极图；采用CA—FD方法，针对单晶定向凝固过程进行数理建模与仿真，实现了凝固过程的三维宏观温度场与微观组织生长的模拟计算．从宏、微观角度解释了定向凝固过程的晶粒竞争演化行为，为引晶段设计提供理论支持．
Nanoscale transport of merocyanine 540 within/near the plasmon field of gold nanoparticles was recognized as an effective inducer of single-excitation dual-emission ratiometric properties. With a high concentration of the signal transducer (ammonium), a 700% increase in fluorescence was observed at the new red-shifted…
The addition of a shell layer onto semiconducting quantum dots is an approach to control the optical bandgap of core–shell systems. In this direction, we have grown several core–shell nanostructures having a type-I heterostructure configuration. The nature of the energy-offset has been varied by a suitable shell-mater…
The electric properties of hybrid organic-inorganic nanostructured coated XLPE are investigated in this paper with the purpose to understand if this class of nanostructured insulating material could have applications in the field of high voltage electrical insulation. Space charge measurements and aging tests under pa…
ZnO was prepared by hydrothermal method. The result of scanning electron microscopy showed that the materials had nanorod structures. Ag–doped ZnO was prepared by UV–photoreduction respectively. Crystalline phases and optical absorption of the prepared samples were determined by X–ray diffraction, Raman spectrum and U…
The surface of porous nitride radome became very compact by AlPO 4 -Si 3 N 4 -SiO 2 (n) coating treatment. Coating could immerse into the matrix about 20μm deep. This could also make material be moisture resistance for long time placement. Coating effectively healed the micro cracks on the matrix and combined with it…
Gastropods have served as research subjects for investigating questions that transcend both the taxon and the field of malacology. A major set of questions arises from repeated patterns in the microstructure, sculptural features, and coiling geometry of gastropod shells. The problem of similarity is one of distinguish…
Switching field reduction and applied field dependence of the switching field of 2 to 4-layer exchange coupled composite (ECC) dots were studied. The analysis was performed based on a simple spin-model. For 2-layer ECC dots, minimum switching field normalized by the averaged anisotropy field, h*, was obtained for zero…
This experiment involves the growth of ZnO nanorods with NaOH by the HMT-assisted hydrothermal method and discusses the efficiency of NaOH is helpful to the growth of ZnO nanorods. The analyses of the synthesized ZnO nanorods by XRD, SEM, EDS and TEM reveal a single crystal structure with good crystallinity where the…
Anti-reflection coating, which exhibits higher transmittance than that of glass substrate itself, has been obtained by hydrothermal treatment of Al film in ultrapure water and hydrothermally-treated Al film was consisted of transparent boehmite (aluminum oxyhydroxide) (J. Appl. Phys. 106 (2009) 023524). However the st…
Nanocrystalline bismuth ferrite (BiFeO3) powders were synthesized by simple sol-gel route using bismuth nitrate, iron nitrate and freshly extracted egg white (ovalbumin) in aqueous medium. In this process, synthesized through solutions of some specific salts led to the formation of nanoparticle BiFeO3 powders (40–95 n…
Influence of processing parameters, calcination and sintering temperatures, on the properties of Sr(Fe0.5Nb0.5)O3 samples were investigated The Sr(Fe0.5Nb0.5)O3 ceramics were fabricated by a solid-state reaction method. X-ray diffraction analysis revealed that pure perovskite phase of SFN powders was observed for the…
This study chose the propiconazole and nano-zinc oxide of different particle size as the study object. The single and combined toxicity on the mouse embryonic fibroblast cell (NIH/3T3) was researched. The results showed that the cell growth was inhibited by propiconazole and nano zinc oxide of different concentrations…
The results of numerical finite element modeling of microdestruction of spatially reinforced composite materials, based on the method of asymptotic averaging and the method of finite element solution of local problems on periodicity cells, are presented. The modified Pisarenko−Lebedev model has been used as a criterio…
The growth-controlled synthesis of zinc oxide nanorods (ZnO NR) in the aqueous phase has been investigated. The rods were grown on ZnO films previously deposited onto Si(100) and indium tin oxide (ITO) substrates by RF magnetron sputtering. The formation of the rods took place in the presence of hexamethylenetetramine…