电解液组成对锂离子电池电化学性能的影响

以LiMn1.5Ni0.5O4作为锂离子电池的正极材料,用电化学手段考察了其电池的电化学性能与电解液组成的关系,研究发现混合电解液的放电容量的顺序为EC DEC(1:1)>EC DMC(1:1)>EC DEC(3:2)>EC DEC(2:3)>EC PC(1:1),从而为LiMn1.5Ni0.5O4作为锂离子电池的正极材料选择了较理想的混合电解液。     

新化合物硫酸亚镱钾K_2Yb_2(SO_4)_3的合成和结构研究

用固相反应首次合成了二价镱的新化合物K2Yb2(SO4)3,初步结构分析表明该化合物为正交晶系,空间群P2.2.2,晶胞参数a=10.3552(9),b=10.5104(5),c=10.2010(4)A,Z=4。     

钛白废酸中硫酸亚铁的分离及废酸回收

根据硫酸亚铁在硫酸溶液中的溶解度数据,探讨用二级浓缩法回收钛白废酸的可行工艺。着重讨论了常压浓缩、陈化结晶和真空浓缩的工艺条件。试验结果表明废酸在分离硫酸亚铁后,其硫酸浓度达80%(重量比)以上,可用于钛白生产中。     

Microstructure and corrosion resistance of sputtered TiN coatings on surface of Zr-4 alloy

To improve the oxidation resistance and corrosion resistance of Zr-4 alloy, titanium nitride(TiN) coatings were prepared on the Zr-4 alloy with a TiN ceramic target with different ratios of N_2. Microstructure and high-temperature properties of the TiN coated samples were studied by scanning electron microscopy(SEM), energy dispersive spectrometer(EDS), X-ray diffraction meter(XRD), X-ray photoelectron spectroscopy(XPS), heat treatment furnace and autoclaves, respectively. The x value of the TiN coatings(TiN_x) ranges from 0.96 to 1.33. After the introduction of N_2, TiN coating exhibits a weak(200) plane and a preferred(111) orientation. The coating prepared with an N_2 flow ratio of 15% shows an optimal oxidation resistance in the atmospheric environment at 800 °C. In either 1 200 °C steam environment for one hour, or deionized water at 360 °C and a pressure of 18.6 Mpa for 16 d, the opitimized TiN coated samples have no delamination or spallation; and the gains in the masses of samples are much smaller than Zr-4 alloy. These results demonstrate the effectiveness of the optimized TiN coating as the protective coating on the Zr-4 alloy under extreme conditons.     

中国文学历史发展的质的飞跃--关于五四新文学对传统文学的否定

五四新文学是在对传统文学的否定中确立自身的,对传统文学的否定是五四新文学最重要的本质之一.五四新文学对传统文学的否定是对"自己以前的存在形式"的否定.是中国文学历史发展中的一次质的飞跃.从诗三百篇到明清小说,从楚辞对诗歌形式的革新到晚清文学改良运动,中国文学的每一点进步和发展,都是这一质的飞跃前的量变的积累.外国文学的影响只能是一种不起根本性作用的原因.     

(n-C12H25NH3)2CuBr4固-固相变动力学的研究

（n-C12H25NH3)2CuBr4可作为固－固相变贮热材料，利用Kissinger及Ozawa两种非等温动力学模型，处理了标题化合物的DSC实测曲线，计算了固－固相变过程中的表观活化能和反应级数。     

The work of lagrange in number theory and algebra

Joseph Louis Lagrange, a French mathematician, worked on a variety of topics — Algebra (classical and abstract), Number Theory, Dynamics, Functions of several variables, and Astronomy to mention a few. Here we give proofs of four theorems, three in number theory and one in group theory. It is said that post-Newtonian mathematics was dominated by two giants, Lagrange and Euler, in the eighteenth century. While Euler mainly contributed to pure mathematics, Lagrange contributed equally to mathematical physics and pure mathematics. Lagrange had special love for the theory of numbers and theory of polynomials.     

N-(4-氯苯基)-N''-(1,2,4-三氮唑)脲的合成

以4-氯苯甲酸为原料，经过CURTIUS重排反应制得4-氯苯异氰酸酯，再进一步与3-氨基-1H-1，2，4-三氮唑发生亲核加成反应，合成了目标化合物N-(4-氯苯基）-N'-(1，2，4-三氮唑）脲，其产率为89%。对目标化合物经元素分析、IR和^1HNMR表征，并初步测定了此化合物的植物生长调节活性。     

1-吡啶-3-[4-(苯基偶氮)苯基]-三氮烯-溴化十六烷基三甲铵-阴离子表面活性剂显色反应的研究及应用

在硼砂—氢氧化钠缓冲溶液中 ,1 -吡啶 -3-[4 -(苯基偶氮 )苯基 ] -三氮烯 -溴化十六烷基三甲铵 ( CTMAB)和阴离子表面活性剂 ( AS)形成紫红色配合物 ,配合物在 60 0 nm处有最大吸收。测定阴离子表面活性剂十二烷基苯磺酸钠、十二烷基磺酸钠、十二烷基硫酸钠表观摩尔吸光系数 ε60 0 分别为 1 .64× 1 0 4 ,1 .2 2×1 0 4 ,1 .1 5× 1 0 4 L·mol- 1·cm- 1。研究的新方法已应用于合成水样及环境水样中阴离子表面活性剂的测定 ,结果满意     

“4M”教学模式在《计算机网络》课程教学中的构建与实践

“学—导多元互动”教学模式是江苏广播电视大学广大教师多年来坚持“以人为本”的科学发展观,适应江苏远程开放教育发展的要求和实践而形成的。作者在多年的远程开放教学过程中进行了探索与实践,在“学—导多元互动”教学模式的基础上总结出符合《计算机网络》课程自身特点的“4M”教学模式:“学员学习自主化、资源整合多元化、教学辅导多样化、学习支持立体化”。