Synthesis and Characterization of [60]Fullerene Ferrocenylmethyl Derivatives

Two new [60]fullerene ferrocenylmethyl derivatives have been prepared via different approaches and characterized by UV-Vis、 FT-IR、 NMR、 FAB-MS spectra and VPO. The second approach , i.e reacting fullerene with ferrocenylmethyl azide directly, was never reported as yet.     

三种纳米材料C_(70),C_(60)Cl_6和C_(60)Ph_6引起细胞自噬的现象

为了进一步研究富勒烯家族及其衍生物引起细胞自噬的现象,运用荧光显微镜、透射电子显微镜、蛋白免疫印迹等技术,对水溶性的纳米C70,C60Cl6和C60Ph6诱导的细胞自噬现象进行了初步探讨.实验结果显示,C70,C60Cl6和C60Ph6稳定分散于水中形成的纳米颗粒,均能诱导HeLa细胞产生自噬现象,揭示了富勒烯家族及其衍生物在生物医药领域更广泛的研究和应用价值.     

Spontaneous transformation of C60Br24 to C60 in solvents

It was found that C₆₀Br₂₄ transforms to C₆₀ spontaneously in some solvents. The intermediate, C₆₀Br₈, can be separated in some cases. When the bromine trap, phenol, was added,p-bromophenol and other brominated product were obtained and identified. The influences of time, the kind of solvent, etc were investigated. Possible mechanism was suggested. Supported by the National Natural Science Foundation of China Liu Ying: born in 1969, Ph. D     

Controlled fabrication of fullerene derivative one-dimensional nanostructures via electrophoretic deposition of its clusters

Well-defined and controllable one-dimensional(ID) nanostructures of fullerene derivative have been prepared by an electrophoretic template synthesis method. The clusters of fullerene derivative formed in mixed solvents are introduced into the channels of porous alumina templates through a dc electric field. Four types of ID nanostructures(solid nanowires, solid-wall nanotubes, porous nanowires and porous-wall nanotubes) have been obtained by changing the deposition parameters. This,approach opens a new avenue to assemble fullerene derivatives, endohedral fullerenes, as well as other functional organic compounds, which can form clusters in ID nanostructure arrays for applications in chemical sensors, light energy conversion devices and nanoscale electronic and optoelectronic devices.     

水溶性富勒烯分子囊泡在二维DNA晶体上的有序自组装

C60-N,N-二甲基吡咯是一种水溶性富勒烯的衍生物,在水体系中会聚集成分子囊泡.C60分子囊泡的直径范围为20~120 nm,其中70%的直径小于60 nm.在本实验中,把这种水溶性富勒烯衍生物的分子囊泡和磷酸化的2D DNA晶体在一定条件下静止,原子力扫描显微镜可以观察到在DNA晶体表面,富勒烯的分子囊泡形成了珍珠串状的有序排列.通过对原子力扫描显微镜的图片分析,初步推断了富勒烯的分子囊泡在DNA晶体上进行自组装的机理.     

Double-Talk Detection Algorithm Based on the Ι2 Norm

Echo canceller generally needs a double-talk detector which is used to keep the adaptive filter from diverging in the appearance of near-end speech. In this paper we adopt a new double-talk detection algorithm based on ι2 norm to detect the existence of near-end speech in an acoustic echo canceller. We analyze this algorithm from the point of view of functional analysis and point out that the proposed double-talk detection algorithm has the same performance as the classic one in a finite Banach space. The remarkable feature of this algorithm is its higher accuracy and better computation complexity. The fine properties of this algorithm are confirmed by computer simulation and the application in a multimedia communication system.     

Theoretical study on photophysical property of C60M（CO）5 （M=Cr,Mo and W）

Configurations of three η2 models of transition-metal [60]fullerene derivatives C60M（CO）5（M=Cr, Mo and W） have been optimized at B3LYP/LanL2DZ level. On the basis of the optimized geometrical structures, their electronic spectra and the frequency dependence of third-order nonlinear optical polarizabilities γ in different optical processes of third-harmonic generation （THG）, electric-field-induced second-harmonic generation （EFISHG） and degenerate four-wave mixing （DFWM） are calculated by using TDB3LYP model based on LanL2DZ level coupled with the SOS （sum-over-state） method. The obtained results show that their electronic spectra have a red shift compared with that of [60]fullerene and different transition-metal functional groups added to C60 cage may result in different spectrum properties. For the three studied species, （η^2-C60）Mo（CO）5 has the largest third-order nonlinear optical polarizability.     

3,4-dichlorotoluene ammoxidation to 3,4-dichlorobenzonitrile over VPO/SiO<Subscript>2</Subscript> catalyst

Ammoxidation of 3,4-dichlorotoluene (DCT) to prepare 3,4-dichlorobenzonitrile (DCBN) over silica supported vanadium phosphorus oxide catalysts has been studied. On the VPO/SiO₂ catalyst, the influence of the reaction temperature, the molar ratio of air/DCT, the molar ratio of NH₃/DCT in the feed gas and the space velocity (v ₁) on the conversion, yield and selectivity was observed. The most appropriate reaction condition is: reactionT=673 K,n(DCT):n(NH₃):n(air)=1:7:30 andv ₁=250 h⁻¹. At this optimum reaction condition, the conversion of DCT is 97.8%; the molar yield of DCBN is 67.4%. It was found that the addition of element phosphorus can improve the yield of DCBN compared with VO/SiO₂ catalyst. Foundation item: Supported by Youth Chen-Guang Project of the Committee of Science and Technology of Wuhan (20015005042) Biography: Huang Chi(1972-), male, Ph D, Lecture, research direction: ammoxidation.     

Applying evolutionary algorithm to public key cryptosystems

A best algorithm generated scheme is proposed in the paper by making use of the thought of evolutionary algorithm, which can generate dynamically the best algorithm of generating primes in RSA cryptography under different conditions. Taking into account the factors of time, space and security integrated, this scheme possessed strong practicability. The paper also proposed a model of multi-degree parallel evolutionary algorithm to evaluate synthetically the efficiency and security of the public key cryptography. The model contributes to designing public key cryptography system too. Foundation item: Supported by the Hi-Tech Research and Development Foundation item: Supported by the Hi-Tech Research and Development Biography; Tu Hang (1975-), male, Ph. D candidate, research directions: Biography; Tu Hang (1975-), male, Ph. D candidate, research directions:     

Optical Properties of Ru（bipy）2 （dppx）^2＋ in Different Environments

The emission spectra of Ru（bipy）2 （dppx）^2＋ in different environments has been studied. It was found that the solvent polarity and the ability of donating and transferring proton are the important factors in predicting luminescence intensity in different systems. The increasing content of water in the organic solutions of Ru（bipy）2 （dppx）^2＋ leads to de crease in emission intensity that follows the Perrin sphere of quenching model. The effect of base content of DNA on the fluorescence spectra of Ru （bipy）2 （dppx）^2＋ has also been studied.     

A Novel Degradation Pathway of Zn（dmid） （ phen）2 in Pyridine

The light-oxidation degradation processes of Zn(dmid)(phen)2(dmid = 4, 5-dimercapto-1,3-dithiole-2 one, phen = 1,10-phenanthroaline) in pyridine solvent has been monitored, h has been found under the light, dmid^2- of Zn(dmid)(phen)2 in pyridine solution could generate NCS^- and NCS^-replaces dmid^2- to form Zn(NCS)2 (phen)2 simultaneously. The crystal structure of Zn(NCS)2 (phen)2 has been determined. In the crystal of Zn(NCS)2 (phen)2. two NCS^- ligands are arranged in syn-configuration, and there is strong π-π interaction between the two adjacent parallel phen.     

Silicon field emission arrays coated with CN<Subscript>x</Subscript> thin films

Arrays of silicon micro-tips were made by etching the p-type (1 0 0) silicon wafers which had SiO₂ masks with alkaline solution. The density of the micro-tips is 2×10⁴ cm⁻². The Scanning Electron Microscope (SEM) photos showed that the tips in these arrays are uniform and orderly. The CN_x thin film, with the thickness of 1.27 μm was deposited on the silicon micro-tip arrays by using the middle frequency magnetron sputtering technology. The SEM photos showed that the films on the tips are smoothly without particles. Keeping the sharpness of the tips will benefit the properties of field emission. The X-ray photoelectron spectrum (XPS) showed that carbon, nitrogen and oxygen are the three major elements in the surfaces of the films. The percents of them are C: 69.5%, N: 12.6% and O: 17.9%. The silicon arrays coated with CN_x thin films had shown a good field emission characterization. The emission current intensity reached 3.2 mA/cm² at 32.8 V/μm, so it can be put into use. The result showed that the silicon arrays coated with CN_x thin films are likely to be good field emission cathode. The preparation and the characterization of the samples were discussed in detail. Foundation item: Supported by the National Natural Science Foundation of China (19975035) Biography: Chen Ming an (1978-), male, Ph. D candidate, research direction: novel functional materials film and ion beam modification of materials.     

Potassium ferricyanide oxidative cyclization of arylaldehyde witho-phenylenediamine ando-aminophenol to 2-arylbenzimidazoles and 2-arylbenzoxazoles

Some new benzimidazoles and benzoxazoles have been prepared under mild condition by oxidative cyclization of arylaldehyde witho-phenylenediamine ando-aminophenol using potassium ferricyanide as oxidant Foundation item: Supported by National Natural Science Foundation of China (29672029) Biography: LIU Xin (1975-), male, Ph D.     

中国产植物新种

本描述了中国产植物１９个种及２个新变种。新种是：粗炷银莲花、峨眉楠、纤轴楠、坝王新木姜子、阿沛悬钩子、米兰山小桔、隐脉沟瓣花、四蕊八角枫、伞花锦香草、黑叶鹅掌些、腺紫金牛、毛果柿；石生柿、张氏柿、榄果柿、高盘萝芙木、窝穴素馨、裂叶紫珠、拟珠；新变种是：光果威灵仙、少花卵叶锦香草。全部模式标本存中山大学植物标本室。     

On the normal criterion of quasimeromorphic mappings

In this paper, we generalize an, inequality of meromorphic mappings to quasimeromorphic ones. Applying the results here, we can establish a normal criterion of quasimeromorphic mappings. Foundation item: Supported by the National Natural Science Foundation of China (No. 19871064) Biography: Deng Fang-wen (1974-), male, Ph. D. candidate, research interest: complex analysis.     

Building Intrusion Tolerant Software System

In this paper, we describe and analyze the hypothesis about intrusion tolerance software system, so that it can provide an intended server capability and deal with the impacts caused by the intruder exploiting the inherent security vulnerabilities. We present some intrusion tolerance technology by exploiting N-version module threshold method in con-structing multilevel secure software architecture, by detecting with hash value, by placing an ““““““““antigen““““““““ word next to the return address on the stack that is similar to human immune system, and by adding ““““““““Honey code““““““““ nonfunctional code to disturb intruder, so that the security and the availability of the software system are ensured.     

The reflective function of differential system

This article deals with the reflective function of the differential systems. The results are applied to discussion of the existence and stability of the periodic solutions of these systems. Foundation item: Supported by the National Natural Science Foundation of Jiangsu Educational Committee (02 KJB 110009) Biography: Zhou Zheng-xin(1962-), female, Ph. D, Associate professor, research interests: ordinary differential equation.     

Subliminal Channels in the NTRU and the Subliminal-Free Methods

The construetion and destruction of subliminal channel are important problems in the information hiding. The subliminal channel can send secret information without notice. Two subliminal-free methods named weak （strong） subliminal-free on public-key cryptosystem （PKC） are proposed in this paper using the combinatorial method. The first method can only free the subliminal information with any minor probability and the second can free all. Moreover, the ＂traitor problem＂ which is same as the model of the subliminal channel in PKC is given. Two subliminal channels are embedded in N-th degree truncated polynomial ring （NTRU） cryptosystem, and their subliminal-free methods are also be obtained by the action of surveillant.     

Investigation of CAM-brain by using EQUnn model

The model of EQUnn (equivalent neural network of the CAM-Brain model) is proposed. With the help of EQUnn model, it is proved that the CAM-Brain can solve the XOR problem. Supported by the National Natural Science Foundation of China Wang Baozhong: born in 1967, Ph. D     

Some index classes of singularity of vector fields on manifolds with boundary

V. I. Arnold defined some particular classes of index for singularities of adapted fields. We generalize these index classes for general fields on manifolds with boundary and get some relations of these index classes. Foundation item: Supported by the National Natural Science Foundation of China (10261002) Biography: Xu Xu (1973-), male, Ph. D, research direction: singularities and differential topology.