二苯碳酰二肼分光光度法测水中Cr6+

运用二苯碳酰二肼分光光度法对水中铬进行测定,发现在硫酸介质中,Cr6+与二苯碳酰二肼形成组成比为3：2的配合物,其最大吸收波长位于540nm处,表观摩尔吸光系数为4×104L*mol-1*cm-1,铬的质量浓度在0.004mgL-1～1.000mgL-1范围内符合比尔定律,相关系数γ=0.996 9。并对分光光度法的最佳条件,包括酸性介质、酸试、试剂用量、显色时间、有色配合物的稳定性及其它离子对测定Cr6+干扰进行了研究。     

重组人截短型IL—6表达载体的构建及表达

旨在建立人截短型IL-6原核高效表达系统。用PCR方法获得截短的人IL-6基因（rhIL-6cDNA）,将其插入克隆载体pUC18中,经证实后再克隆入表达载体pBV220中,鉴定阳性表达载体。结果建立了截短型IL-6基因的克隆载体,经测序证实完全正确;构建了截短型IL-6的原核表达质粒pBV220/rhIL-6并获得高效表达;初步纯化的表达蛋白的比活性为5×10     

用Ag替代而形成的La212型新化合物的合成、结构与电磁性质研究

用高温固相反应法合成了La2-xAgxCaCu2O6新化合物,找到了最佳合成条件,结构研究表明：新化合物具有典型的La212型化合物晶体结构：La,Ag占有4e位置,Ca占有2a位置,La1.65Ag0.35CaCu2O6的电阻与温度关系表现为金属行为。     

新型CsLiB6O10晶体倍频特性的理论研究

对新型非线性晶体CsLiB6O10的I类,II类倍频的相位匹配角,有效非线性系数,允许波长进行了理论模拟计算,在400－2400nm波段范围内对CLBO和BBO的倍频特性比较结果表明,由于CLBO的有效非线性系数小,允许参量范围比BBO宽,易获得高能量的激光输出。     

两点电位滴定法测定维生素B6的含量

提出了用两点电位滴定法测定维生素B6含量的新方法,只需记录两次终点附近的AgNO3标准溶液的体积和相应电极电位值,即可利用两点法公式计算出终点体积,从而确定维生素B6含量。     

Cr~(6+)、As~(3+)污染对黑藻叶细胞伤害的超微结构研究

电镜观察发现 ,黑藻 (Hydrillaverticillata(L .F .)Royle)叶细胞遭受Cr6+ 、As3 + 毒害初期 ,高尔基体消失 ,内质网膨胀后解体 ,叶绿体中的类囊体和线粒体中的脊突膨胀 ,核中染色质凝集 .随着叶细胞毒害程度的加重 ,核仁消失 ,核膜破裂 ,叶绿体和线粒体解体 ,质壁分离使胞间连丝拉断 ,最后细胞死亡 .结果表明 :Cr6+ 、As3 + 对细胞的膜结构与非膜结构都产生毒害作用     

Research on crystal growth and properties of a new nonlinear optical crystal: Bismuth borate BiB3O6

BiB₃O₆ (BIBO) single crystals with sizes of 44 mm × 24 mm × 10 mm and weight of 24.7 g have been successfully grown by the top-seeded method. In this note, the preparation of seed, the growth of crystal and some problems encountered are reported. The lattice parameters of BIBO area =7.1203(7)?,b = 4.9948(7)?,c = 6.5077(7)?,β= 105.586(8) ?,V=222.93(5)?³, which were determined by BRUKER-P4 four-circle diffractometer. BIBO is biaxial crystal and the relative orientation of (X, Y, Z) with regard to (a, b, c) is:X // b, (Y, c) =47.2°, (Z, a) = 31.6°, determined by the X-ray analysis combined with polarized microscopy. The second-harmonic-generation (SHG) conversion efficiency of the sample for 1.064 μm light is up to 67.7%. We have also obtained the third harmonic generation (THG) of 1.064 μm, namely, 1.064 μm + 0.532 μm →0.355 μm. BIBO crystal is free of moisture and hygroscopy.     

Syntheses, crystal structure and magnetic properties of Rm+nCo5m+3nB2n

The phase relations at the 600℃ and 700℃ isothermal sections of the ternary systems R-Co-B for R= Nd, Pr and R = Sm, Gd respectively were summarized in this paper. For Rm+ n Co5m+3n B2n, two new types ofcompounds R3Co13B2(R=Pr, Nd, Sm, Gd, Dy, Ho, Er, Y) (m=2, n=1) andR5Co19B6(R=Pr, Nd) (m=2,n = 3 ) were synthesized by utilizing the principle of structural combination. Their crystalstructures and easymagnetization direction were determined by X-ray powder diffraction, and structures were refined by the Rietveldmethod. The Curie temperature Tc, saturation magnetization M8 and anisotropic field HA of the new compounds weremeasured using a vibrating-sample magnetometer, an extraction sample magnetometer and M(H) - H curves of samplesin different magnetization directions respectively. The Tc and Ms of Rm + n Co5 m + 3 n B2n increase with increasing values of mat a given n value. HA increases with an increase in n when m is kept invariable. The effects of the substitution of Ni for Co on the magnetic properties of Nd13 Co15- x Nix B2 were also investigated. It was found that TsR decreased monotonously as the concentration of Ni increased, and at x = 3 the easy magnetization direction becomes axial at room temperature. The relations between crystal structure and magnetic properties of Rm + nCo5m+ 3nB2n and the possible routes of synthesizing permanent magnetic materials are also discussed.     

BX1型弧焊变压器的温升校核

本研究工作根据弧焊变压器在热平衡状态下产热和散热一致的原理,提出了BX1型弧焊变压器温升校核的新方法,并应用VB6.0软件开发了BX1型弧焊变压器温升校核的程序.本文最后列举了BX1-500型弧焊变压器温升校核的应用实例.     

用VC实现三维图形ActiveX控件

以正方体线框图为例,论述了用VisualC++6.0如何实现三维图形的Act iveX控件的制作,为今后用VC开发专用图形软件提供了有利帮助.