Salt effects on formation of microcrystallites in poly(vinyl alcohol) gels prepared by cast-drying method

The preparation method of poly(vinyl alcohol)(PVA) gels by a simple cast-drying technique using salt solutions was reported in the present investigation.The effects of the salt concentration on the macro- and microscopic properties were examined in detail,and the relationships between macroscopic properties,such as swelling ratio,mechanical strength,and the network microstaicture were presented.It was found that the swelling ratio of PVA cast gel increased largely by adding a small amount of salt, and de...     

Formation and characterization of phthalocyanine dimer/C60 solar cells

Ni-Cu-Zn ferrite/CaTiO_3 and Ni-Cu-Zn ferrite/BaTiO_3 composites which can be applied in low temperature co-fired ceramic(LTCC) technology were synthesized by conventional solid-state reaction at temperature lower than 950℃.Influence of the microstructures and the gap parameterδ/D on the complex permeability of the above two composites was investigated.The modifiedδ/D values of the above two composites show a good fit to the magnetic circuit model.The dielectric properties of the composites were predicte...     

Exploitation of shape memory alloy actuator using resistance feedback control and its development

The relationship between phase transformation and electric re sistivity of Ti-42.6Ni-7Cu SMA was investigated. In the isothermal tensile tests, stress—strain curve shows large hysteresis and nonlinearity, whereas the resistivity—strain curve can be fitted by linearity. The resistivity of SMAs can be determined from the volume fractions of the martensitic and austenitic phas es. This characteristics leads to that the resistance of the SMAs is used as a parameter of strain of SMAs. A SMA actuator using resistance feedback control system was proposed, which can control and retain positioning at any positions without using sensor devices, and the deviation of position of this system was less than 3 μm.     

Fabrication, nanostructures and electronic properties of nanodiamond-based solar cells

Nanodiamond-based solar cells were fa bricated and the photovoltaic properties were investigated. Fullerene (C60) and fullerenol (C60(OH)10-12) were used as n-type semiconductors, and diamond nan oparticles and metal phthalocyanine derivative were used as p-type semiconductors. The nanostructures of the solar cel ls were investigated by transmission electron microscopy and X-ray diffracometry, and the electronic property was discussed.     

Fabrication and characterization of TiO2 -based dye-sensitized solar cells

Dye-sensitized solar cells TiO_2 with were fabricated.The phase composition and microstructures of the solar cells were examined by X-ray diffractometry and transmission electron microscopy,and the energy levels of the present solar cells were also discussed.The results show that a solar cell mixed with xylenol orange and rose Bengal shows a higher conversion efficiency compared to solar cells with a single dye.An introduction of amorphous TiO_2 layers results in an improvement of the conversion efficien...     

3S技术在东京都绿地分析与规划中的应用

通过对日本东京都绿地的监测与分析，以及梅林公园规划中GPS实际应用经验的总结，探索3S技术在公园绿地分析与规划中的应用优势与问题。结果表明，3S技术应用于绿地分析、地形模拟、数据库制作、虚拟体验方面具有较高的实用价值，具有监测范围广、模拟精确、一体化程度高等优点，有利于促进绿地监测、分析和规划的作业自动化。