Effect of Y2 （CO3）3 and Surfactants on Electrorheological Performance of SiO2 Particle Materials

The SiO2 particle material has weak electrorheological (ER) activity. The ER performance of the SiO2 particlescan be ameliorated after adsorbing Y2(CO3)3. In this paper, the effect of Y2(CO3)3 and different surfactants on the ER performance of the SiO2 particle materials is investigated. The results show lhat anionic or cationic surfactants maybe enhance the ER activity of SiO2 material, and nonionic surfactants cannot when surfactants are added during the process of the SiO2 particle preparation, only the anionic surfactant, AES, can enhance markedly the ER performance of the material. The surface area, pore volume and pore diameter of the particles were measured. The effect of Y2(CO3)3 and the surfactants on the microstructure of SiO2 materials and the relationship between ER effect and the microstructure are described.     

保定师专学生微量元素含量测定与分析

用火焰原子吸收光谱法对保定师专部分学生发样中微量元素Fe、Zn、Ca、Pb含量进行了测定．对师专学生微量元素含量情况进行了分析，并对其饮食习惯提出建议。     

Preparation and Electrorheological Property of Y4O（OH）9（NO3）-NH4NO3 Materials

The new electrorheological (ER) material, a particle material composed of Y4O(OH)9(NO3) and NH4NO3, was obtained.They display better ER performance.The shear stress of the suspension of Y4O(OH)9(NO3)(NH4NO3)2.8 material in dimethyl silicone oil reaches 1469 Pa at an electric field strength (E) of 4.2 kV·mm-1 and the shear rate (γ) of 150 s-1.The relative shear stress, τE/τ0 (τE and τ0 are the shear stresses at E=4.2 and 0 kV·mm-1, respectively), is up to 29, which is 19 times that of pure Y2O3 material.The dielectric and conductive property of the materials play important roles in the modification of the ER effect of the particle materials.The researches on these new ER materials are very useful for obtaining a better understanding on the mechanism of the ER effect and finding an ideal ER material.     

运用计算机实现集炉生产过程和工艺的管理

介绍了焦炉生产过程计算机管理系统的组成、特点、功能及使用效果。     

Ti6Al4V表面TiN/Ti复合膜的制备及摩擦学性能研究

采用直流磁控溅射法在Ti6Al4V表面制备TiN/Ti复合膜。分别用FESEM、GDEOS和XRD分析薄膜表面的成分及相结构;利用划痕仪分析膜基结合强度;通过球盘磨损机和轮廓仪测试磨痕形貌和磨损体积,评价膜层的摩擦学性能。结果表明,TiN/Ti复合膜表面致密光滑,呈金黄色金属光泽;膜基结合强度大于100 N;表面镀有TiN/Ti复合膜的Ti6Al4V合金虽没有减磨作用,但提高了耐磨性。     

保定地区农业土壤中有效铅含量的测定

应用火焰原子吸收光谱法测定保定地区农业土壤中有效Pb的含量.保定地区农业土壤中含Pb量的平均水平与全国平均值接近,有10个县市农业土壤中的Pb含量超过全国的平均值.     

Structure and Electrorheological Performance of Nanosized Y2O3-Doped TiO2 Particle Materials

The nanosized particle materials of doped-TiO2 with Y2O3 were prepared by means of sol-gel technique for use in electrorheological (ER) fluids, and their crystal structures were measured by X-ray diffraction (XRD) analysis. To compare with the pure TiO2, a distinct enhancement in the shear stress under dc electric field was found by using such materials. This can be explained by the increase of the dielectric loss and dielectric constant at low frequency. The effects of the crystal structure of the particles on the dielectric property and ER performance of materials were investigated.     

运用计算机实现焦炉生产过程和工艺的管理

介绍了焦炉生产过程计算机管理系统的组成、特点、功能及使用效果。     

Preparation and Electrorheological Performance of SiO2 Particle Materials Adsorbed with YF3, Y2（CO3）3, Y2（C2O4）3 or YPO4

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保定地区儿童头发中微量元素的含量测定

用火焰原子吸收光谱法测定儿童头发中的微量元素Fe、Zn、Ca、Pb的含量,并将城市和农村儿童头发中Fe、Zn、Ca、Pb的含量进行比较,探讨营养、环境污染等诸多因素对儿童身体、智力发育造成的影响。