基于J2EE的电子商务教学模拟系统的设计与实现

基于J2EE的电子商务教学模拟系统是基于B/S结构的交互式电子商务教学软件,其功能涵盖了电子商务的基本内容,包括B2C电子商城、B2B、C2C、物流、网上银行、CA认证、网络营销等.     

射频溅射金属前驱体硫化法制备的Cu2ZnSnS4薄膜

采用射频溅射技术沉积Cu／Sn／Zn金属前驱体叠层结合硫化技术在玻璃衬底上成功制备了Cu2ZnSnS4薄膜。X-射线衍射分析表明，通过优化制备条件可以获得单一黝锡矿结构且具有（221）择优取向的Cu2ZnSnS4薄膜。霍尔效应和紫外可见透过谱测量表明，样品的薄膜电阻、吸收系数和光学带隙分别达到0．073Ω·cm，10^4cm^-1和1．53eV，具有适合作为薄膜太阳电池吸收层应用的可能性。     

The concentration quenching characteristics of ~5D_3-~7F_J and ~5D_4-~7F_J (J=0―6) transitions of Tb~(3 ) in YBO_3:Tb~(3 ) phosphor

The photoluminescence quenching behaviors of 5D3-7FJ and 5D4-7FJ (J = 0―6) transitions of Tb3 in YBO3:Tb under 130―290 nm excitation were systematically investigated. The results revealed that the quenching concentrations of both 5D3-7FJ and 5D4-7FJ transitions of Tb3 in YBO3:Tb were mainly de-pendent on excitation wavelength. Particularly,the quenching concentrations of 5D4-7FJ transitions of Tb3 under 130―290 nm excitation were correlated with excitation bands of YBO3:Tb. The quenching concentrations of 5D3-7FJ transitions remained at low concentration (2%) under 186―290 nm excitation and then increased gradually with energy of incoming excitation photon when excited at 130―186 nm. This dependence should be involved in their excitation mechanisms and quenching pathway in particular excitation region.     

Nitric oxide suppresses stomatal opening by inhibiting inward-rectifying K_(in)~ channels in Arabidopsis guard cells

We explore nitric oxide (NO) effect on K in channels in Arabidopsis guard cells. We observed NO inhib- ited K in currents when Ca2 chelator EGTA (Ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid) was not added in the pipette solution; K in currents were not sensitive to NO when cytosolic Ca2 was chelated by EGTA. NO inhibited the Arabidopsis stomatal opening, but when EGTA was added in the bath solution, inhibition effect of NO on stomatal opening vanished. Thus, it implies that NO ele- vates cytosolic Ca2 by activating plasma membrane Ca2 channels firstly, then inactivates K in chan- nels, resulting in stomatal opening suppressed subsequently.     

日本人的“ラち”、“そと”意识与日语的时态转换

从日本人的“ラち”、“そと”意识角度出发，通过对川端康成、志贺直哉的几部小说进行分析统计，探讨日语在描写过去的事件中，插入“内时态‘る’形”的条件和原因。分析发现当作者为了使作品更生动，或是作者与作品中人物产生“同感”时，或是表达作者的主观思想、评论时，往往发生时态的转换。     

新指示反应催化光度法测定痕量铁的研究

研究了在溴化十六烷基吡啶存在下，以邻菲啉为活化剂，铁催化抗坏血酸还原对羟基苯基重氮氨基偶氯苯的褪色反应及其动力学条件，探讨了反应机理，建立了高选择性测定痕量铁的新方法．本法检出限为９５×１０－１１ｇ／ｍｌ．线性范围为０－１０μｇ／２５ｍｌ．用于发样、食品样中痕量铁的测定，结果满意．     

Li3Sn的电子和几何结构:第一原理计算

CuSn化合物在近来的锂电池负极材料研究中引起了相当的重视.使用基于混合基表示的第一原理赝势法,研究了Li插入CuSn完全替代了Cu而且占满所有间隙位置后形成的Li3Sn的电子与几何结构性质.给出了其"结构～能量"关系图,电子能带结构,电子态密度以及电荷密度分布等.     

SL(2,R)上的Hardy-Littlewood极大函数的性质

本文给出了SL(2,R)上的Hardy-Littlewood极大函数mf的定义,利用Ergodic定理证明了Hardy-Littlewood极大函数的强(p,p)型性质,p>1.