Chirality-asymmetry force between ɑ-quartz and copper block

The chirality-asymmetry macroscopic force mediated by light pseudoscalar particles between α -quartz and some achiral matter is studied. If this force between achiral source mass and α -quartz with some chirality is attractive, it will become repulsive when the chirality of the α -quartz crystal is changed. According to the tested limits of the coupling constant g_s g_p /\hbar c< 1.5× 10^-24 at the Compton wavelength λ = 10^-3 m, the force (F) between a 0.08× 0.08× 0.002 m³ block of α -quartz and a 0.08× 0.08× 0.01 m³ copper block with a separation being 0.5× 10^-3 \mbox{m} in between, is estimated from the published data at less than 4.64× 10^-24 N, i.e. F < 4.64× 10^-24 N.     

竹叶状多孔SnS薄膜的沉积

以硫代乙酰胺、三乙醇胺、氯化亚锡和氨水作反应物,氯化铵作缓冲剂,采用化学浴法在玻璃衬底上沉积SnS薄膜,并用X射线衍射(XRD)、扫描电子显微镜(SEM)等分析手段对样品进行了表征.XRD分析结果表明样品为斜方晶体结构的多晶SnS薄膜.SEM观察结果显示薄膜表面呈竹叶状多孔形貌,此结构有利于增加太阳电池的光吸收.     

新单取代苯磺酰脲衍生物的合成及生物活性

以较高活性的单取代苯磺酰脲为基础,设计合成了14个新的含烷硫基和烷胺基嘧啶环的单取代苯磺酰脲化合物,其结构经¹HNMR及元素分析确证.用油菜根长法测定IC₅₀,并进行盆栽除草活性测试,结果表明,嘧啶环4位取代基的变化对分子除草活性影响较大,活性大致按烷氧基、烷硫基和烷胺基的顺序递减.     

Hall Conductivity in a Quasi—Two—Dimensional disordered Electron System

By making use of the diagrammatic techniques in perturbation theory,we have investigated the Hall effect in a quasi-two dimensional disordered electron system.In the weakly localized regime,the analytical expression for quantum correction to Hall conductivity has been obtained using the kubo formalism and quasiclassical approximation.The relevant dimensional crossover behavior from three dimensions to two dimensions with decreasing the interlayer hopping energy is discussed.The quantum interference effect is shown to have a vanishing correction to the Hall coefficient.     

N-苄氧/烷氧苯基-4,6-二取代嘧啶胺类化合物的合成、晶体结构及除草活性

以5种苄氧基/烷氧基苯胺为基础, 设计合成了系列新颖的N-苄氧/烷氧苯基-4,6-二取代嘧啶胺类化合物, 其结构经1H NMR、MS及元素分析确证, 其中化合物5r的单晶结构经X射线单晶衍射分析确证. 油菜平皿法和稗草小杯法测试除草活性结果表明, 4种苄氧基/烷氧基苯胺3a, 3b, 3d, 3e具有较好的除草活性, 在100 μg/mL浓度下对单子叶稗草生长抑制率可达到77.3%—88.5%. KARI活性测试结果表明, 化合物5a—5s有较弱的KARI抑制活性.     

肌红蛋白与生物碱相互作用的光谱性质研究

用分子荧光光谱法和紫外可见分光光度法研究了肌红蛋白（myoglobin,Mb）与咖啡因、茶碱相互作用的光谱性质变化。据Stern-Volmer图得到猝灭常数,由紫外-可见吸收光谱判断均为静态猝灭,通过热力学常数得出其相互作用力为静电作用,依据Foerster偶极-偶极无辐射能量转移理论计算出Mb与生物碱间的距离,并用同步荧光光谱技术考察了生物碱对Mb构象的影响。     

利用等时退火法预估等温退火效应实验研究

对电离辐照损伤后的MOS器件的等温和等时退火特性进行了研究，结果发现，首先，100℃等 温退火是有效的，等时退火所需的全过程时间最短；其次，+5V栅偏压退火相对于0V和浮空 偏置条件，阈值电压恢复速度快、恢复程度大；最后，利用等时退火数据对等温效应进行了 理论预估，实验等温曲线和预估结果吻合得较好. 关键词： 等温退火 等时退火 MOS器件     

Iterative learning consensus control with initial state learning for fractional order distributed parameter models multi-agent systems

This paper considers the consensus control problem of multi-agent systems (MAS) with distributed parameter models. Based on the framework of network topologies, a second-order PI-type iterative learning control (ILC) protocol with initial state learning is proposed by using the nearest neighbor knowledge. A discrete system for proposed ILC is established, and the consensus control problem is then converted to a stability problem for such a discrete system. Furthermore, by using generalized Gronwall inequality, a sufficient condition for the convergence of the consensus errors between any two agents is obtained. Finally, the validity of the proposed method is verified by two numerical examples.     

有机溶液中电化学制备纳米MgTiO3

In a cell without separating the cathode and anode spaces, the precursor MgTi(OCH₂CH₃)_(6-y)(acac)_y of the mixed oxide MgTiO₃ was directly synthesized by electrochemical dissolution of titanium for 4 hours and then of magnesium for 1 hour 40 minutes at the current of 0.2 A in ethanol and acetyl-acetone solution. The nano- MgTiO₃ powder was prepared by a direct sol-gel process of the electrolyte solution under pH≈8.5 followed by washing, drying in vacuum for 24 h, and calcination at 500 ℃ for 2 h. IR and Raman spectroscopy, XRD, and TEM were used to investigate the structure of nano-MgTiO₃ and its precursor. The result suggested that it was more appropriate to control the temperature between 35～40 ℃ and the concentration of conductive additive (Bu₄N)Br at 0.04 mol·L^-1. The xerogel with an average particle size of 12 nm and the nano-MgTiO₃ of 20 nm was thus obtained in a high purity.     

N，N，N’，N’-四炔丙基-4，4＇-二氨基-二苯甲烷与4，4＇-联苯二苄叠氮固化动力学研究

分别利用FtIR和DSC技术对由N，N，N＇，N＇-四炔丙基4,4’-二氨基-二苯甲烷（TPDDM）与4，4’-联苯二苄叠氮（BAMBP）形成的一种新型三唑树脂的固化反应及其动力学进行了研究．TPDDM与BAMBP通过1，3-偶极环加成反应形成三唑五元环结构的聚合物，固化起始温度约为70℃，体系在较低温度下即可固化．反应体系的固化反应是一级反应，采用DSC法与FFIR法分别获得了表观聚合反应动力学参数，其结果具有一定的可比性．