The Wave Function with Symplectic Symmetry and Its Application

The antisymmetrized geminal power (AGP) and sequential product of geminals(SPG) functions, the basis functions with symplectic symmetry, are linearly combined to calculate the ground state of the LiH molecule. The calculation results show that the AGP or SPG function gives the same ground state results as the linear combination.     

Luminescence of Eu~(2 ) in Strontium Aluminum Oxide System with Long Decay Property

Luminescentmaterialshavinglongdecayperi0dhaveat-IIactedmuchinterestduetotheirpotentialwidespreadaPplicati0ns.Recently,alongdecayluminescentp0wderhavingthecomPositionofSrAl2O4activatedwithEu' wasreportedandregardedasthebestcandidateforpracticalaPPlicationbecauseofitsuniqueadVantages0veritsprecursors.l'2Inthispaper,wereportthesynthesisofthelongdecayluminescentpowderandtheinnuence0fthemolarratioofAlt0sr0ntheethessioncolor.Toproducethelundnescentp0wder,amixtureofSrCO3,Al2O3,Eu2O3andsomesol…     

沉淀溶解法制备纳米硫化锌

以烷基黄原酸锌和硫化钠分别为锌源和硫源，采用烷基黄原酸锌沉淀溶解法制备了粒度可调、粒径分布比较窄的面心硫化锌纳米粒子，利用比表面积(BET)测定、透射电镜(TEM)、粉末X射线衍射(XRD)、傅里叶转换红外光谱(FTIR)等方法对合成的硫化锌纳米粒子进行了表征。结果表明随着烷基黄原酸锌链长的增长，通过添加硫化钠而生成的硫化锌纳米粒子的粒径逐渐减小。本文还对沉淀溶解法制备纳米硫化锌的溶液化学反应机理进行了探讨。     

低分子量聚乙烯双单体非均相共接枝

在非均相体系中采用甲苯－水共沸条件下由自由基引发剂引发，低分子量的聚乙烯与丙烯酸和甲基丙烯酸甲酯进行双单体共接枝反应，从而对非极性聚乙烯进行化学改性，探索一条新型聚乙烯接枝改性的途径，考察了反应温度、时间、物料比、引发剂用量等诸多因素对接枝效果的影响。     

FORMATION AND DEVELOPMENT OF TAIHU LAKE AND RECENT DEPOSITION

Situated in the Taihu plain between the mouth of the Changjiang River and theHangzhou Bay, the Taihu Lake is a large shallow-water lake in China with a surface area of 2427.8 km~2.The lake bottom mainly consists of loess-like sediment. Some buried and silted up channels and residual depressions can be found at the bottom and a lot of Neolithic cultural relics on the loess-like sediment. This indicated that the Taihu Lake was formed on the alluvial plain charaterized by widely deposited loess-like sediment because of siltation and stagnancy of water, instead of by development from lagoons as reported in the past.Recent deposition including influent-effluent current accumulation, wind-driven current and storm deposition in this lake occurred mainly in the south, the west shore and the midst of the lake.The sedimentary rate in the east Taihu Lake is about 1.7-1.8 mm/a, whereas in the west Taihu Lake it is about 0.41 ram/a, only 23％ of that of the former.     

TETRABUTYLAMMONIUM－TETRACYANOQUINODIMETHANE AS ELECTRON－TRANSFER MEDIATOR IN AMPEROMETRIC GLUCOSE SENSOR

ＴＥＴＲＡＢＵＴＹＬＡＭＭＯＮＩＵＭ－ＴＥＴＲＡＣＹＡＮＯＱＵＩＮＯＤＩＭＥＴＨＡＮＥＡＳＥＬＥＣＴＲＯＮ－ＴＲＡＮＳＦＥＲＭＥＤＩＡＴＯＲＩＮＡＭＰＥＲＯＭＥＴＲＩＣＧＬＵＣＯＳＥＳＥＮＳＯＲ￥ＣｈａｎｇＱｉｎｇＳＵＮ；ＷｅｎＢｅＳＯＮＧ；ＤｕｏＺ...     

CF3CO和CF3C（O）O自由基分解反应理论研究

利用文献结果，用统计热力学和过渡态理论计算了ＣＦ３ＣＯ和ＣＦ３Ｃ（Ｏ）Ｏ自由基分解反应的热力学和动力学数据。计算结果表明，计算值与最新实验数据甚相符合，并据此判断，ＣＦ３ＣＯ和ＣＦ３Ｃ（Ｏ）Ｏ均很不稳定，不可能参加Ｏ３分解的循环催化反应。     

Cr/CeO2体系及其对乙烷脱氢反应催化性能的研究

The dehydrogenation reaction of ethane over Cr/CeO₂ catalysts in presence of CO₂ was studied with fixed-bed micro-reactor. The Cr/CeO₂ catalysts of different Cr loading have been synthesized using impregnation techniques. The Cr/CeO₂ system has already been found to be active and selective in the reaction at around 740 ℃. The function of carbon dioxide is to remove coke and hydrogen to accelerate dehydrogenation of ethane. The results of catalysts characterizations indicated that Cr³⁺ and Cr⁶⁺ occurred on the surface of the catalysts. The 1.2 mmol Cr/100m₂ CeO₂ catalyst sample with a monolayer dispersion of Cr on CeO₂ support showed a stronger surface acidity and a maximum yield of ethylene of about 35.5% at 36.6% conversion of ethane.     

QuEChERS-气相色谱-串联质谱法测定枸杞中农药残留

建立了QuEChERS-气相色谱-串联质谱法测定枸杞中农药残留的分析方法。样品经乙腈提取，采用乙二胺-N-丙基硅烷（PSA）、C18和石墨化炭黑（GCB）3种吸附剂净化，在多反应监测模式（MRM）下进行检测，基质外标法定量。结果显示，检测项目在5~500 μg/L范围内呈良好线性（R²>0.99），在3个添加水平下测得回收率为71.5%~109.7%，相对标准偏差（RSD）为1.94%~9.87%（n=6）。该方法灵敏度高、净化效果好，可同时快速检测有机磷类、有机氯类农药。     

单边裂纹聚苯乙烯样品拉伸断裂过程的声发射

本文测定了单边裂纹聚苯乙烯(PS)样品在拉伸加载时的声发射以及声发射事件按幅度、脉宽、计数和位置的分布,实验证实,单边裂纹PS样品拉伸时的声发射来源于裂纹端部银纹区的变形、断裂和扩展,大部分总振铃计数由裂纹亚临界和失稳扩展引起,在重复加载时观察到PS声发射的Kaiser效应。