Vacuum Fluctuations and Motion of a Charged Test Particle in a Cylindrical Spacetime

The effects of quantum electromagnetic fluctuations upon the motion of a test charged particle are examined in a cylindrical spacetime in which one spatial is compactified. The mean squared fluctuations in the velocity and position of the test particle are calculated. It is found that the random motion of the test particle will be anisotropic. The possible consequences for theories with extra compactified spatial dimensions are discussed.     

双奇核184Au中πi13/2⊙νi13/2转动带的结构特征研究

利用重离子熔合蒸发反应和在束γ谱学实验方法,研究了双奇核184?Au的高自旋态能级结构.扩展了基于πh9/2ν7/2–[514]和πi13/2νi13/22准粒子组态下的转动带能级纲图,建立了两个转动带之间以及πh9/2ν7/2-[514]带与基态的谱学连接.从而确定了πi13/2νi13/2带能级的自旋和宇称,证实了此转动带在低自旋区出现旋称反转.分析了πi13/2νi13/2带和相邻核转动带的准粒子顺排特征,指出此带的第一回弯以及相邻核转动带在低频观测到的顺排异常可能与h9/2质子顺排有关.     

A New Method for the Synthesis of Selenium Nanoparticles and the Application to Construction of H202 Biosensor

The well-distributed, stable selenium nanoparticles (10 nm) with good adhesive abilityand biocompatibility were successfully synthesized by using the template of chitosan cross-linkedwith glutaradehyde. The resulting selenium nanoparticles were used as a new carrier forhorseradish peroxidase to construct H2O2 biosensors with good performances.     

有限步扩散反应置限分形聚集

综合考虑扩散粒子浓度n、粒子扩散限制范围Δ、扩散粒子与种粒子或团簇相遇时，反应概率P及粒子扩散步数W的影响，提出了有限步扩散反应置限聚集的分形生长模型，模拟得到一系列典型的聚集生长图形，计算了相应的分形维数.结果表明，在粒子浓度n较小时，呈离散团簇状生长；而在粒子浓度较大时，则随反应概率P或粒子扩散步数W的增大，从离散团簇状生长转变为连续枝叉状生长. 关键词：     

无限深球方势阱中粒子能级的一个简单近似解析式

本由ＷＫＢ方法和玻尔－索末菲量子化规则，求出了无限深球方势阱中粒子能级近似满足的超越方程；然后通过进一步近似，找到了粒子能级近似满足的解析式并对所得结果的精度进行了计算机分析。     

SYNTHESIS OF POLYMER—SUPPORTED PALLADIUM CATALYSTS AND THEIR CATALYTIC BEHAVIOR FOR THE SELECTIVE HYDROGENATION OF MESITYL OXIDE

Copolymer of styrene-divinylbenzene in bead from was made by suspension polymerization.After chloromethylation and amination,five kinds of polymeric amines were thus obtained.These polymers were reacted with palladium chloride,and were then reduced.The polymer-supported catalysts synthesized above were used to catalyze the selective hydrogenation of mesityl oxide under reaction conditions of 80℃ and 10kg/cm^2,using methanol as a solvent.The catalytic activity and MIBK(methyl isobutyl ketone) formation selectivity of the catalysts were examined.     

一维螺旋状3，6-哒嗪二甲酸镉(Ⅱ)配位聚合物的合成与结构

Using the ligand pyridazine-3，6-dicarboxylate (H₂pzdc)， a coordination polymer [Cd₂(pzdc)₂(H₂O)₄] was synthesized and characterized by elemental analysis， thermal analysis， IR and single-crystal X-ray diffraction. The complex crystallizes in the tetragonal system with space group I4₁/a. The crystallographic data are: a=1.470 6(4) nm， c=1.489 8(6) nm， V=3.222 0(19) nm³， Z=16， μ=2.725 mm^-1， D_c=2.594 g·cm^-3， R₁=0.017 8， wR₂=0.044 6. In the complex， the cadmium(Ⅱ) ions with the eight-coordinated dodecahedral geometry are linked by the pzdc ligands to generate one-dimensional chains， which are associated into the three-dimensional architecture via O-H…O hydrogen bonding. CCDC: 658853.