Dynamic kinetic resolution of 2-oxo-3-aryl-succinates by organocatalyzed aldolization

The dynamic kinetic resolution of 2-oxo-3-arylsuccinates was achieved vial-proline-catalyzed addition of acetone in acetonitrile at room temperature, providing the desired adduct in good yield with up to 87 : 13 dr and high ee up to 99%.     

非齐次线性微分方程解的增长性

研究了非齐次线性微分方程f^{(k)}+A_{k-1}(z)f^{(k-1)}+...+A_{s}(z)f^{(s)}+...+A_{0}(z)f=F(z) 解的增长性,其中A_{j}(j=0,1,\cdots,k-1)及F是整函数. 在A_{s}比其他系数有较快增 长的情况下,得到了上述非齐次微分方程在一定条件下的超越整函数解的超级的精确估计.     

与差分算子或移位算子分担小函数的整函数

In this paper,we give some interesting results concerning the entire function f(z) sharing a small function a CM with its difference operators or shifts.     

ZEROS OF ENTIRE SOLUTIONS TO COMPLEX LINEAR DIFFERENCE EQUATIONS＊

In this article,we study the complex oscillation problems of entire solutions to homogeneous and nonhomogeneous linear difference equations,and obtain some relations of the exponent of convergence of z...     

On properties of difference polynomials

We study the value distribution of difference polynomials of meromorphic functions, and extend classical theorems of Tumura-Clunie type to difference polynomials. We also consider the value distribution of f (z)f (z + c).     

On zeros of solutions of higher order homogeneous linear differential equations

In this article, we investigate the exponent of convergence of zeros of solutions for some higher-order homogeneous linear differential equation, and prove that if A_k−1 is the dominant coefficient, then every transcendental solution f(z) of equation

f(k)+A_k-1 f(k-1)+?+A₀ f=0$f^{(k)}+A_{k-1}\hspace{0.17em}{f}^{(k-1)}+?+A_0\hspace{0.17em}f=0$

satisfies λ(f) = ∞, where λ(f) denotes the exponent of convergence of zeros of the meromorphic function f(z).     

燃油氧化脱硫

综述了燃油的氧化脱硫,包括一些具有吸引力的氧化脱硫方法,如H2O2/有机酸,H2O2/杂多酸,H2O2/含钛分子筛和其它非过氧化氢体系(如叔丁基过氧化物等).对本课题组开发的新型乳液催化氧化脱硫体系进行了详细的介绍.在乳液体系中,界面问的传质限制被大大降低.在温和条件下,双亲性乳液催化剂可以将柴油中的含硫化合物选择氧化...     

MoP催化剂上乙炔选择性催化加氢

通过高温还原法制得磷化钼(MoP)催化剂,采用X射线衍射和原位x射线光电子能谱对其进行了表征,并考察其催化乙炔选择性加氢性能.结果表明,在650℃经H2还原制得的催化剂中形成了大量的低价态物种MoP,但仍含有大量的高价态Mo和P物种,该催化剂具有加氢活性中心和缺电子中心双重功能,在乙炔选择性加氢反应中,乙炔转化率超过9...     

DNA酶: 筛选、 生物传感及展望

综述了脱氧核糖核酸酶(DNA酶)的起源及分离富集策略, 对比了DNA酶与核糖核酸酶(RNA酶)及蛋白酶的相似点和不同之处, 并重点讨论了产物捕获和对冲抵消等策略对筛选获得DNA酶的独到之处; 同时系统回顾了近年来分离出的可特异感应各种金属离子或生物样本(包括细菌、 细胞等), 从而能在特定位点切割RNA底物的DNA酶探针; 阐述了DNA酶领域现存的挑战, 总结和展望了新思路和新方向.