Advanced Materials Research Vols. 476-478

Abstract: In view of well- designed office desk is advantageous to alleviating fatigue, the author analyzes the category of office desk, and combining the design problem of existing office desk which exists in using function, art function and material technique function and others, discusses the shape design, the color design and the man-machine factors of office desk. Among them the man-machine factors mainly elaborate the height design of desktop, the depth design of desktop and other designs. Then the possibility is analyzed. On this foundation, the design practice of new type office desk is done.

Abstract: In this paper, the WC-16TiC-xTaC-10Co mixture mixed by WC 0.52μm, (W, Ti, Ta)C 2.9μm and Co1.36μm and prepared by high-energy ball milling, changed the VC and Cr3C2 adding amount. After ball milling for 60 hours, an average particle size of 220nm powder was prepared and it was cold isostatic pressed at 300MPa and vacuum sintered at 1410°C. The physical properties and the micrographs of samples were detected. The main conclusions are as follow: the coercivity and hardness increase and Cobalt magnetic decreases with the content of Cr3C2 increasing, the transverse rupture strength (TRS) does not vary. The VC and Cr3C2 inhibit the growth of WC grain, but can’t inhibite the (W, Ti, Ta)C grain growth effectively.

Abstract: One-pot process for preparation ferrocenylethene derivatives by solvent-free Wittig Reaction of ferrocenecarboxaldehyde, alcohol, triphenylphosphonium bromide, and NaOH without the synthesis of phosphorus ylides was reported. The ferrocenylethene products obtained had an 80% yield with NaOH as the base at room temperature for 30 to 90 minutes.

Abstract: Rover dynamics simulation is an essential component of its 3-D visualization platform. Here we present a Bekker theory-based rover soft-soil dynamics model to accurately reflect the wheel-ground interaction as the rover navigates on the lunar surface. A rover dynamics model was then established using the multi-body dynamics simulation system, Vortex, with an integrated soft-soil dynamics computing module, to carry out whole vehicle simulation, which revealed the kinetics features of rover locomotion in the complex lunar terrain.

Abstract: The authors established a rehabilitation move-assistant device in SolidWorks, and then imported the model into Adams to create a simulation model via the interface between them. Adams run dynamic simulations of the model under different load outputting torque applied to the model when it was moving at uniform speed. The dynamic simulations have forecasted the performance of products based on the model well and shown the importance of Adams in product development.

Abstract: Silicate-based Sr2-xMgSi2O7:xEu2+(x=0.01, 0.03, 0.05, 0.07) phosphors were synthesized by the high temperature solid-state reaction method. Phase purity and crystal structure of the phosphors were characterized using X-ray diffraction spectrometer. The optical excitation and emission spectra of Eu2+ ion were measured using luminescence spectrometer and fluorescence spectrophotometer. The emission spectra showed a strong blue luminescence peaked around 470 nm, corresponds to the 4f65d1 →4f7 transition on Eu2+. Two different average decay time confirmed that the Eu2+ cations may occupy in two different lattice sites and presents different spectroscopic features. With a broad absorption band extending from 224 to 450 nm, it is suggestive that the phosphors have a potential application in UV-LED chips (360-400 nm).

Abstract: Stretch-oriented cyanine-dye-doped poly(vinyl alcohol) (PVA) films were prepared at temperatures above the glass transition temperature of PVA. The optical absorption spectra of the stretch-oriented films exhibited an anisotropy. The third-order nonlinear optical susceptibilities of the stretch-oriented films were measured parallel and perpendicular to the stretching direction by the resonant femtosecond degenerate four-wave mixing (DFWM) technique, and a high anisotropic X⁽³⁾ was observed for the uniaxially stretch-oriented cyanine-dye-doped PVA films.

Abstract: The task of this study is to find the optimal condition of designed High Concentration Reflected Photovoltaic (HCRPV) module by simulation method whose concentration ratio is set to be 872 and 78.5. This simulated optimal condition was then utilized to fabricate HCRPV module. From simulation results, the light collective efficiency, the energy uniformity, the shape of light spot diagrams can be obtained. It was found that square based pyramid light guide tube can effectively improve the uniformity of light on model A structure. When the slope angle of square based pyramid shape of light guide tube is set to be 3 degree, the focal length of the first mirror is 60mm and the secondary mirror vertex distance is designed to be 93.1mm, the HCRPV module have the best performance. It was also found that the light collective efficiency can be reached to about 97.7% with these conditions. On model B structure, the size was reduced to 9 times without light guide comparing to model A structure. It was also found that the light collective efficiency can also be reached to about 97.1%. The Aluminum HCRPV module was then fabricated according to the optimal simulated conditions. When the HCRPV module was coated with silver material, the voltage on the multi-junction solar cell was measured to be 2.7V and 2.68V, the current was measured to be 2.83A and 0.63A corresponding to model A and B structures, as the solar energy of illumination is 800 W/m2. The power is measured to about 7.64W and 1.7W corresponding to model A and B structures.

Abstract: A novel multibranched nonlinear dye，4, 4´, 4´´-tris(9-carbazyl-trans-styryl) triphenylamine (TCSTPA)，has been designed and synthesized aimed at two-photon absorption applications. Two-photon absorption cross section of the multibranched dye was obtained as high as 2.35×10^-47 cm⁴ s photon^-1 molecule^-1 pumped with femtosecond laser beam at 800 nm. One-photon and two-photon absorption optical properties were demonstrated in solutions. Three-dimensional (3D) optical data storage experiments were carried out by two-photon photobleaching in the multibranched-dye doped polymethylmethacryate (PMMA) with a 3D data storage density of approximate 14 Gbits/cm³. Research on the two-photon photobleaching ability shows the novel two-photon absorption dye with multibranched molecular motif has higher photosensitivity than traditional linear two-photon absorption dyes do.

Abstract: The mean projected ranges and range straggling for energetic 200 – 500 keV Yb ions implanted in single crystal silicon (c-Si) at room temperature were measured by means of Rutherford backscattering followed by spectrum analysis. The measured results are compared with Monte Carlo code (SRIM2010) predictions. Our results show that the measured values of the mean projected range R_p are good agreement with the SRIM calculated values; but the difference of the range straggling ΔR_p between the experiment data and the calculated results is much higher than that of R_p.