Identification of m=2 competent mode of complex magneto-hydro-dynamics activities during internal soft disruption based on singular value decomposition and tomography of soft-X-ray emission on the HT-7 tokamak

In this paper,the singular value decomposition(SVD) method as a filter is applied before the tomographic inversion of soft-X-ray emission.Series of ’filtered’ signals including specific chronos and topos are obtained.(Here,chronos and topos are the decomposed spatial vectors and the decomposed temporal vectors,respectively).Given specific magnetic flux function with coupling m = 1 and m = 2 modes,the line-integrated soft-X-ray signals at all chords have been obtained.Then m = 1 and m = 2 modes have been identified by tomography of simulated ’filtered’ signals extracted by the SVD method.Finaly,using the experimental line-integrated soft-X-ray signals,m = 2 competent mode of complex magnetohydrodynamics(MHD) activities during internal soft disruption is observed.This result demonstrates that m = 2 mode plays an important role in internal disruption(Here,m is the poloidal mode number).     

湿气迁移方程的非线性初边值问题

In this paper,combining Riemann's method with the fixed point theory effectively,we proved that the migration equation of the moisture in soil with nonlinear initial boundary value problem has unique classical solution.     

The Migration Equation of the Moisture in Soil with Nonlinear Initial Boundary Value Problem

Ｔｈｅｅｑｕａｔｉｏｎｕｘｔｘ＋η（ｘ,ｔ）ｕｘｘ＝Ｆ（ｘ,ｔ,ｕ,ｕｘ,ｕｘｘ）（１）ｉｓａｐｐｌｉｅｄｔｏｍａｎｙａｓｐｅｃｔｓ,ｓｕｃｈａｓｔｈｅｍｉｇｒａｔｉｏｎｏｆｍｏｉｓｔｕｒｅｉｎｓｏｉｌ,ｓｏａｋｉｎｇｔｈｅｏｒｙｉｎｍｕｌｔｉ－ｈｏｌｅｍｅｄｉａ,ｅｔｃ．,ｗｈｏｓｅｐｒｏｂｌｅｍｓｏｆｄｅｔｅｒｍｉｎａｔｅｓｏｌｕｔｉｏｎｓａｒｅｄｉｓｃｕｓｓｅｄｉｎｒｅｆ．［１－３］,ｉｎｗｈｉｃｈ,ｉｔｓｃｈａｒａｃｔｅｒｉｓｔｉｃｏｒｉｎｉｔｉａｌｖａｌｕｅｐｒｏｂｌｅｍｓａｒｅｓｔｕ…     

甲壳素和壳聚糖在离子液体中的溶解、材料化以及衍生化

甲壳素和壳聚糖是可再生的大分子生物质资源.由于分子内和分子间的强烈氢键作用,甲壳素和壳聚糖不能溶解在水或常规有机溶剂中,这极大地限制了其在诸多领域中的应用.离子液体作为一种新型绿色溶剂,对甲壳素和壳聚糖具有优良的溶解作用.本文综述了离子液体对甲壳素和壳聚糖的溶解性能和溶解机理,概述了均相溶液体系中纤维、膜、凝胶等材料的制备以及酰化、接枝共聚、交联、降解、希夫碱化等多种衍生化反应,总结了离子液体在甲壳素和壳聚糖化学研究中面临的挑战并对其进行了展望.     

First-Principles Study on Native Defect Complexes in InN

We present first-principles calculations of the formation energy of different native defects and their complexes in wurtzite InN using density-functional theory and the pseudopotential plane-wave method. Our calculations are aimed in the three cases： N/In = 1, N/In 〉 1 （N-rich）, and N/In 〈 1 （In-rich）. Our results indicate that the antisite defect has the lowest formation energy under N/In = 1. The formation energy of nitrogen interstitial （nitrogen vacancy） defect is significantly low under the N-rich （In-rich） condition. Thus the antisite defect is an important defect if N/In = 1, and the nitrogen interstitial （nitrogen vacancy） defect is a vital defect under the N-rich （In-rich） condition. The atomic site relaxation around the nitrogen interstitial and vacancy is investigated. Our calculations show that the nitrogen vacancy cannot be observed although it is one of the most important defects in InN. Our results are confirmed by experiments.     

三塔级联水精馏系统分离含氚轻水中试实验研究

针对大体量含氚水分离净化的需求,自主设计建设了三塔级联水精馏系统,内部装填有自研高性能填料。在中试实验过程中,以5～10 kg/h的处理量,完成了吨量级含氚轻水的分离处理,实现了贫化倍数高于2 000倍、富集倍数高于20倍的分离效果。测得规整填料等板高度为14 cm,散堆填料等板高度为4 cm,运行过程各关键参数稳定,全系统已稳定运行超过900 h,可满足规模化工程放大的要求。     

纳米TiO_2表面有机化改性的研究

本文依次采用2,4-甲苯二异氰酸酯(TDI)和丙烯酸羟乙酯(HEA)对纳米TiO2表面进行有机化改性,通过FT-IR、激光粒度分析和分散性测试表征其表面的结构并对改性前后的性能进行了比较.结果表明,TDI- HEA与TiO2表面的羟基发生了反应,表面化学键接的TDI-HEA量在40℃较20℃高,并随TDI-HEA/TiO2摩尔比的增大迅速增加,当摩尔比达0.4时趋于平缓,达到10.46%.在非极性有机溶剂中,改性后的TiO2分散性较未改性时有了明显的提高.     

C0半群高阶微分算子的谱

本文研究了Ｃ０半群Ｔ（ｔ）的高阶微分算子Ｔ（ｎ）（ｔ）的谱给出了Ｔ＾（ｎ）（ｔ）的谱集的一种构造方法,讨论了Ｔ（ｎ）（ｔ）的谱点与Ｔ（ｔ）的无穷小生成元Ａ的谱点之间的关系。