Broensted酸性离子液体催化醛（酮）与二元醇的缩合反应

研究了以Broensted酸性离子液体1-正丁基-3-甲基咪唑磷酸二氢盐（BMImH2PO4）为催化剂，在不使用其它有机溶剂且无需脱水的条件下，于室温下进行醛（酮）与二元醇的缩合反应，得到了由中至高的转化率和高选择性，产物1，3-二口恶戊烷可以和反应物自动分层，后处理操作简单过量的醇与离子液体可以多次重复使用，且醛（酮）的转化率无明显降低。     

甲胺与MFI、FAU 及FER型高硅沸石的相互作用

The adsorption of methylamine on highly siliceous MFI, FAU and FER-type zeolites was investigated withXRD, FT-IR, Raman, ^13C and ^29Si MAS NMR, and compared with the adsorption of methanol. As the adsorption of the amine, the relative intensity of XRD peaks of the zeolites has been changed significantly, the high-resolution ^29Si MAS NMR peaks have been broadened and shifted to low field, and the resonance of Si-OH groups has appeared. The vibration of N-H has been shifted to low frequency and C-N vibration moved to high frequency in the IR spectra, and the ^13C resonance peak broadened and shifted to high field for the adsorbed amine. The facts reveal an associating interaction between the perfect framework of the zeolites and the adsorbed methylamine with hydrogen bonds, leading to the formation of Si-OH groups and the high desorption temperature of the methylamine from the zeolites.     

聚丙烯酸酯类Tg的量子化学-神经网络研究

用密度泛函方法在6-31G(d)基组上优化了38种聚丙烯酸酯类的结构单元, 得到了其单元的量子化学参数, 探讨了这些参数与聚丙烯酸酯类玻璃化温度(Tg)的关系. 计算表明, 影响聚丙烯酸酯类Tg的主要因素有结构单元的侧链长度、侧链的分支数、最高占据轨道能级、极化率、偶极矩、等体积热容和热力学能等参数. 用模式识别方法(偏最小二乘法)讨论了这些参数与Tg的定性关系, 两类Tg大小不同的聚合物基本分布在不同区域, 用逐步回归和人工神经网络方法建立了这些参数与Tg的定量关系, 2种方法的预测结果与实验值的相关系数分别为0.9753、0.9985, 标准偏差分别为18.42、4.25, 预报结果与实验值基本一致.     

蛋白质微阵列SPR实时相位检测

将表面等离子体共振(surface plasmon resonance, SPR)与空间相位调制检测结合, 用一束准直的平行光照射传感芯片, 在反射光路中引入渥拉斯顿棱镜, 使光束中的p光和s光产生偏振光干涉形成条纹, 生化反应的有关信息从干涉条纹的相位变化中得出. 选择金膜厚度为30 nm和40 nm的两种芯片, 分别用浓度为50%和20%的酒精-水溶液进行实验, 得到SPR阵列图谱；选择金膜厚度为30 nm, 兔IgG作为阳性对照, 牛血清白蛋白(BSA)作为阴性对照, 与0.2 mL的羊抗兔IgG、1.8 mL水的混合溶液反应, 得到阵列反应图谱. 实验结果表明, 这种方法具有抗干扰能力强, 灵敏度高, 无需标记和可实时检测等优点, 能满足蛋白质芯片检测的要求.     

Ar环境气压对脉冲激光烧蚀制备纳米Si晶粒平均尺寸的影响

采用XeCl脉冲准分子激光器，烧蚀高阻抗单晶Si靶，在1—500 Pa的Ar气环境下沉积制备了纳米Si薄膜. x射线衍射谱测量证实，纳米Si晶粒已经形成.利用扫描电子显微镜观测了所形成纳米Si薄膜的表面形貌，结果表明，随着环境气压的增加，所形成的纳米Si晶粒的平均尺寸增大，气压为100 Pa时达到最大值20 nm，而后开始减小. 从晶粒形成动力学角度，对实验结果进行了定性分析. 关键词： 纳米Si晶粒 脉冲激光烧蚀 表面形貌     

TRACTABILITY OF MULTIVARIATE INTEGRATION PROBLEM FOR PERIODIC CONTINUOUS FUNCTIONS

The authors study the tractability and strong tractability of a multivariate integration problem in the worst case setting for weighted l-periodic continuous functions spaces of d coordinates with absolutely convergent Fourier series.The authors reduce the initial error by a factor ε for functions from the unit ball of the weighted periodic contin- uous functions spaces.Tractability is the minimal number of function samples required to solve the problem in polynomial in ε~(-1)and d.and the strong tractability is the pres- ence of only a polynomial dependence in ε.This problem has been recently studied for quasi-Monte Carlo quadrature rules.quadrature rules with non-negative coefficients. and rules for which all quadrature weights are arbitrary for weighted Korobov spaces of smooth periodic functions of d variables.The authors show that the tractability and strong tractability of a multivariate integration problem in worst case setting hold for the weighted periodic continuous functions spaces with absolutely convergent Fourier series under the same assumptions as in Ref.[14]on the weights of the Korobov space for quasi-Monte Carlo rules and rules for which all quadrature weights are non-negative.The arguments are not constructive.     

塑料壳蓄电池红外线加热装置

为解决蓄电池在低温下使用,因充电困难而造成的障碍,针对近年生产的塑料壳蓄电池存在塑料壳熔点低、受热易软化变型等缺点,设计了一种5面加热的新型红外线加热器,使热能穿透壳体进入内部加热电解液,保证了蓄电池在低温下能正常充电,其电解液温升达15℃/h。