Room temperature synthesis of single-crystal Te nanorods from Na_2TeO_4

Single-crystalline tellurium nanorods were synthesized through the reduction of Na2TeO4 by hydrazine monohydrate, in the absence of surfactants, in an aqueous ammonia solution at room temperature. X-ray diffraction （XRD）, transmission electron microscopy （TEM）, and selected area electron diffraction （SAED） were used to characterize the composition and morphology of the products. The concentration of the OH ion has a significant influence on the morphology of the products and is found to be responsible for tailoring the crystal growth dynamically： the concentration of Te blocking in the solution is reduced via increasing the concentration of the OH^- ion, and subsequently the nucleation rate of Te is suppressed and Te nanorods gradually grow because of the inherently anisotropic structure of Te. New generation tellurium atoms add to the surface of the particles during the long period of reaction.

Citrate-Mediated Hydrothermal Route to Synthesis A Large-Scale Y_2O_3∶Eu^(3+) Hexangular Prism

Europium-doped yttrium oxide (Y2O3∶Eu3+) hexangular microprisms were synthesized through a citrate-mediated hydrothermal method followed by subsequent calcination. The as-prepared products were characterized by X-Ray Powder Diffractometer (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), and fluorescence spectrometer. The sizes of the Y2O3∶Eu3+ hexangular prisms are about 3 μm in rim and 10 μm in length. The citrate additive was found to be responsible for tailoring the crystal growth dynamically: the concentration of hydroxides in solution is reduced via forming citrate-rare earth ion complexes, giving rise to large crystals with perfect facets; the ratio of growth rate of hydroxides along the c-axis and other crystal facets is suppressed, leading to relatively small aspect ratio. The smooth surface and large size led to the luminescence intensity of hexagonal-prism phosphors higher than that of needle-like bundle products obtained without using trisodium citrate additive.

Probabilistic Analysis on Connectivity for Sensor Grids with Unreliable Nodes

This paper mainly investigates the connectivity of the unreliable sensor grid network. We consider an unreliable sensor grid network with mn nodes placed in a certain planar area A, and we assume that each node has independent failure probability p and has the same transmission range R. This paper presents a new method for calculating the connectivity probability of the network, which uses thorough mathematical methods to derive the relationship among the network connectivity probability, the probability that a node is ＂failed＂ （not active）, the numbers of node, and the node＇s transmission range in unreliable sensor networks. Our approach is more useful and efficient for given problem and conditions. Such as the numerical calculating results indicate that, for a 100×100 size sensot network, if node failure probability is bounded 0.5%, even if the transmission range is small （such as R = 10）, we can still maintain very high connectivity probability （reach 95.8%）. On the other hand, the simulation results show that building high connectivity probability is entirely possible on unreliable sensor grid networks.

Fabrication of ultrafine ZnFe2O4 nanoparticles for efficient photocatalytic reduction CO2 under visible light illumination

A one-pot, solvent-thermal process was used to create the ultrafine ZnFe2O4nanoparticles photocatalyst.During the solvent-thermal process, the in situ self-forming NaCl not only served as a "cage" to confine the ion diffusion, but also acted as a microreactor for nanocrystallite growth. An average particle size of ～10 nm and a high-specific surface area of～112.9 m2/g were observed for the ultrafine ZnFe2O4nanoparticles Owing to the synergistic effect of ultrafine particle size, the full utilization of the visible light region and high conduction band(CB) position, ultrafine ZnFe2O4photocatalyst displayed an efficient photocatalytic CO2reduction under visible light illumination. Besides, the ultrafine ZnFe2O4photocatalyst showed high production selectivity for CH3CHO and C2H5OH generation in aqueous CO2/NaHCO3solution. This work may provide a new idea for the synthesis of new high-efficiency photocatalysts.

10英寸超大尺寸复合纳米薄膜用于耐温柔性超级电容器（英文）

现有超级电容器的工作温度区间约为150℃,但柔性较差.在实际工作环境中,存在一些极端的温度环境,比如,极寒地区.本文制备了面积高达550cm^2 (常规尺寸的29倍)的石墨烯/碳纳米管/锰氧化物复合薄膜,并将其用于耐温柔性超级电容器.该电极材料的性能取决于复合薄膜中石墨烯、碳纳米管和锰氧化物的比例.此柔性超级电容器可在-20-200°C温度区间内保持良好的电化学性能和柔性,表现出优异的稳定性.本文为复合纳米材料薄膜的大批量制备和适用于宽温度区间的柔性超级电容器的发展奠定了基础.

Human stochastic closed-loop behavior for master-slave teleoperation using multi-leap-motion sensor

abstracting human control strategy in controlling dynamically stable robots.J Intell Robot Syst,2009。