TX-100反相微乳液的缔合结构研究

对ＴＸ－１００、正戊醇、正己醇、正庚醇、正辛醇及辛烷形成的反相微乳液用ＥＳＲ自旋标记方法进行了研究,结果认为反相微乳液的形成过程伴随着表面活性剂链排列的变化,在加入水量较少时栅状区域的表面活性剂链排列拥挤,进一步的水化作用使其排列疏松。而疏水性强的探针则表明水化作用渗透到了反相微乳液的疏水区域。     

具有垂直传染的SEIA传染病模型的稳定性

建立和研究一类具有垂直传染的SEIA传染病模型,得到模型基本再生数R₀的表达式,运用Lyapunov函数和第二加性复合矩阵理论证明了当R₀〈1时无病平衡点全局渐近稳定,当R₀〉1时地方病平衡点全局渐近稳定.     

一类具有非线性发生率的传染病模型的稳定性

建立和研究一类具有非线性发生率的传染病模型,得到该模型基本再生数R_0的表达式,运用Lyapunov函数和第二加性复合矩阵理论证明了当R_0<1时无病平衡点全局渐近稳定,此时疾病消失,当R_0>1时地方病平衡点全局渐近稳定,此时疾病在人群中流行.     

平面图形认识常见问题剖析

七年级的同学刚刚学习几何内容,由于对概念的内含与外延认识不清,经常会产生一些错解.下面举例说明一些常见的问题,希望对大家的学习会有一些帮助. 一、概念模糊不清 例1判断下列语句中错误的个数: (1)线段AB就是4、B两点问的距离; (2)线段AB的一半就是线段AB的中点; (3)在所有连接两点的线中直线最短; (4)如果AB=BC=CD,则AD=3AB. 其中错误语句的个数是( ).     

铜（III）配合物-罗丹明6G体系流动注射化学发光法测定头孢米诺钠

在酸性条件下,头孢米诺钠对铜（III）配合物-硫酸-罗丹明6G化学发光体系有强烈的增敏作用,据此建立了流动注射化学发光法定量分析头孢米诺钠方法。头孢米诺钠浓度在2．0×10^-7-6．0×10^-6g／mL范围内与化学发光强度呈良好的线性关系,相关系数r=0．99969,检出限为1．4×10^-7g／mL。对2．0×10^-7g／mL头孢米诺钠水溶液进行11次平行分析,测定结果的相对标准偏差为1．69％。利用该方法对鸡血样品和头孢米诺钠针剂中头孢米诺钠的含量进行测定,加标回收率为90．2％～102．1％。     

振荡Robin混合边值齐次化问题

该文研究了振荡Robin混合边值齐次化问题解的收敛率.该工作的困难之处在于Robin边值上出现的振荡因子以及边界交叉项的处理.该文利用对偶方法巧妙得对振荡积分进行了估计.文中建立了解的H1和L2收敛率,所得结果明显地依赖于维数.该文可以视为将对偶方法和光滑算子,延拓到处理振荡Robin混合边值问题的情形.     

ZrO2 对 CuMn2/Al-Ti 整体式催化剂催化苯燃烧反应性能的影响

 采用浸渍法制备了 MnOx/Al0.82Ti0.18Ox (Mn/Al-Ti), Cu/Al-Ti, CuMn2/Al-Ti 和 CuMn2Zr1.25/Al-Ti 四种整体式催化剂, 并利用 X 射线衍射、X 射线光电子能谱、H2程序升温还原和氮吸附等手段对催化剂进行了表征, 考察了各整体式催化剂催化苯燃烧反应性能. 结果表明, ZrO2 的添加能明显提高催化剂的比表面积, 促进各活性组分的分散和表面氧浓度的增加, 从而提高催化剂表面的氧化能力, CuMn2Zr1.25/Al-Ti 整体式催化剂在 281 oC 时苯转化率达 91%, 表现出最高的低温催化活性.     

[U(CO_3)_3(H_2O)_2]·2H_2O配合物的合成及晶体结构

A uranylcontaining compound [U(CO_3)_3(H_2O)_2]·2H_2O has been synthesized under hydrothermal condition and characterized by X-ray single-crystal analysis. Crystal structural analysis indicates that this compound consists of three CO_3~(2-) molecules, one U~(6+). The results reveal that the title compound presents a 3D frame work built up by O-H……O week hydrogen bonds interactions. The central uranium atom is eight-coordinated through three CO_3~(2-) molecules and two H_2O. The compound shows a coplanar hexagonal network structure, each hexagon containing a hexagonal hole with a water moleculet.     

[U(CO3)3(H2O)2]·2H2O配合物的合成及晶体结构

A uranylcontaining compound [U(CO₃)₃(H₂O)₂]·2H₂O has been synthesized under hydrothermal condition and characterized by X-ray single-crystal analysis. Crystal structural analysis indicates that this compound consists of three CO₃^2- molecules, one U⁶⁺. The results reveal that the title compound presents a 3D frame work built up by O-H…O week hydrogen bonds interactions. The central uranium atom is eight-coordinated through three CO₃^2- molecules and two H₂O. The compound shows a coplanar hexagonal network structure, each hexagon containing a hexagonal hole with a water moleculet. CCDC: 737313.     

Low temperature testing and neutron irradiation of a swept charge device on board the HXMT satellite

We present the low temperature testing of an SCD detector, investigating its performance such as readout noise, energy resolution at 5.9 keV and dark current. The SCD's performance is closely related to temperature, and the temperature range of -80 ℃ to -50 ℃ is the best choice, where the FWHM at 5.9 keV is about 130 eV. The influence of the neutron irradiation from an electrostatic accelerator with fluence up to 1×10⁹ cm^-2 has been examined. We find the SCD is not vulnerable to neutron irradiation. The detailed operations of the SCD and the test results of low temperature are reported, and the results of neutron irradiation are discussed.