DISTRIBUTION OF THE（0，∞）ACCUMULATIVE LINES OF MEROMORPHIC FUNCTIONS

Suppose that f(z)is a meromorphic function of order λ（0<λ<+∞）and of lower order μ in the plane.Let ρ be a positive number such that μ≤ρ≤λ.(1)If f^(l)(z)(0≤l<+∞）has p(1≤p<+∞）finite nonzero deficient valnes αi(i=1,…，p)with deficiencies δ（αi,f^(l)),then f(z)has a (0,∞）accumulative line of order ≥ρin any angular domain whose vertex is at the origin and whose magnitude is larger than max(π/ρ，2π-4/ρ ∑i=1^p arcsin √δ（αi,f^(l))/2).(2)If f(z) has only p(0<p<+∞）（0,∞）,accumulative lines of order≥ρ：arg z=θk(0≤θ1<θ2<…<θp<2π，θp+1=θ1+2π）,then λ≤π/ω，where ω=min I≤k≤p(θk+1-θk),provided that f^(l)(z)(0≤l<+∞）has a finite nonzero deficient value.     

丙酮肟氧化偶联合成2,3-二甲基-2,3-二硝基丁烷反应的研究

以丙酮肟为原料,在改性TS-1(钛硅分子筛)催化剂催化下,可用H2O2氧化偶联合成2,3-二甲基-2,3-二硝基丁烷(DMNB).在此基础上以丙酮为原料,在改性TS-1催化剂催化下,一锅法进行丙酮氨肟化和氧化偶联反应可制备收率43.2%的DMNB.该方法简便易操作,操作安全.产物结构经1H NMR,13C NMR表征.     

An extremal problem of quasiconformal mappings

In this paper, the following problem is studied. Let and be two domains in the complex plane with . Suppose that are two quasiconformal mappings satisfying . Let be the mapping in defined by (). If both and are uniquely extremal, is always uniquely extremal? It is shown in this paper that the answer to this problem is no.

     

Continuity of Julia sets

A sufficient and necessary condition is given for the continuity of Julia sets in the space of all rational maps with degreek>1. Project supported by the National Natural Science Foundation of China (Grant No. 19871002).     

水醇溶性小分子卟啉衍生物的合成及其在聚合物太阳电池中的应用

设计合成了Por-N, Por-NBr, Por-Cu-N和Por-Cu-NBr四种水醇溶性小分子卟啉衍生物. 对这类卟啉小分子衍生物的紫外可见吸收光谱研究表明, 基于金属铜配位的卟啉小分子衍生物较未配位化合物有微弱的蓝移. 循环伏安法对这类小分子卟啉衍生物的研究表明, 基于金属铜配合物的卟啉衍生物的最高占有分子轨道能级均没有明显变化. 采用空间电荷限制电流方法对小分子卟啉衍生物的研究表明, 基于金属铜配位的卟啉小分子衍生物的电子迁移率得到明显提高. 以聚合物PCE10为给体材料, 富勒烯衍生物PC₇₁BM为受体材料, 以及合成的小分子卟啉衍生物为阴极界面层制备了结构为ITO/PEDOT:PSS/PCE10:PC₇₁BM/卟啉小分子衍生物/Al的聚合物太阳电池器件. 器件研究结果表明, 化合物Por-NBr, Por-Cu-N与Por-Cu-NBr作为电子传输层的器件的光电转换效率达到9%以上, 其中以Por-Cu-N作为阴极界面层的器件达到的最高效率为9.12%, 相应器件的短路电流密度, 开路电压以及填充因子分别为16.91 mA· cm^-2, 0.79 V和68.1%. 表明这类水醇溶性小分子卟啉衍生物作为聚合物太阳电池的阴极界面层有着广阔的应用前景.     

A Sub‐50‐nm Monosized Superparamagnetic Fe3O4@SiO2 T2‐Weighted MRI Contrast Agent: Highly Reproducible Synthesis of Uniform Single‐Loaded Core–Shell Nanostructures

Oleic acid stabilized superparamagnetic iron oxide nanoparticles (SPION) were selected as the cores for fabrication of sub‐50‐nm monodisperse single‐loaded SPION@SiO₂ core–shell nanostructures. Parameters that influence the formation of SPION@SiO₂ in the water‐in‐oil reverse microemulsion system have been systematically investigated. The sufficiently high concentration of well‐dispersed SPION, together with an appropriately low injection rate of tetraethoxysilane, were found to be the keys to efficiently prevent the homogeneous nucleation of silica and obtain a high‐quality single‐loaded core–shell nanocomposite. A more detailed mechanism for incorporating oleic acid capped inorganic functional nanoparticles into silica is proposed on the basis of previous reports and our new experimental results. Finally, the as‐synthesized SPION@SiO₂ nanospheres are exploited as an MRI‐enhanced contrast agent, and their contrast effect in solution is tested by using a clinical MRI instrument.     

Infrared small moving target detection method based on graph matching

We apply graph matching method to detect infrared small moving targets using image sequences. Candidates （interest points） detected in the first frame form one graph and the same candidates in the last frame form another one. The real moving targets are extracted by matching these two graphs. Experimental results demonstrate that the proposed method is robust and efficient to the translation and rotation of the background.     

具有磁弛豫和荧光性能的氮氧自由基-稀土离子环形双核

选用手性氮氧自由基与稀土离子反应,成功组装了2例2p-4f异自旋内消旋配合物[Ln (hfac)₃((R)-MePP-Ph-NIT)]₂,其中Ln=Eu (1)、Dy (2),hfac=六氟乙酰丙酮,(R)-MePP-Ph-NIT=2-(4-((R)-tert-butyl-2-methylpiperazine-1-carboxylate) phenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide。在配合物中,氮氧自由基配体连接2个稀土离子形成环形双核结构。配合物1展现出铕离子的特征荧光。在配合物2中,磁弛豫相关的频率依赖的虚部信号说明了其单分子磁体的特性。     

3D-SAR And A novel Molecular Pharmacology Model of Cholinergic And Anticholinergic Drugs

Anticholinergic drugs have been widely used for many years in neurological research field and clinicial therapy of many dieases, such as parkinsonism stomachache and the organophosphorus agents poisoning. It is important that investigating the conformation-activity relationship (CAR), 3D-QSAR and molecular pharmacology of these compounds to aid in die design highly selective drugs and explain many phenomena understood difficultly,including the similar biological effects for various compounds and different effects for a single compound.     

应用GM（1,1）模型预测经济发展中的创汇和利税

本试图用灰色模型ＧＭ（１,１）分析我国高我企业经济出口创汇及利税发展趋势,通过具体实例显示,应用这种模型能较有效地预测创汇和利税的趋势。