三元系SrGa2S4：Ce蓝色发光材料

制备了可用于蓝色TFEL的粉末发光材料SrGa2S4:Ce,并对其晶体结构进行了X射线衍射分析,测量并研究了其激发光谱和发射光谱,同时研究了Ce3+浓度的变化对SrGa2S4:Ce的激发光谱、发射光谱、色纯度及发光强度的影响,结果表明SrGa2S4:Ce可发射纯蓝色光,色纯度极佳,实现其高效率的、纯蓝色发射的最佳Ce3+浓度为3～4mol%。     

Hausdroff公式的自动代数展开及其应用

报道了用代数语言REDUCE模拟Hausdroff公式叠代展开过程的计算机程序SIMHAUS.并通过实例叙述了用SIMHAUS程序处理自旋体系在复杂哈密顿作用下的计算机辅助分析过程,为有关这方面的脉冲序列的分析和设计提供了一种新方法.     

改进的无约束化的BFGS算法

提出了一种改进的ＢＦＧＳ算法，该算法的基本思想是采用多步迭代改变一次ＢＦＧＳ算法的修正公式；在假设ｆ（ｘ）是二阶连续可微且一致凸的条件下，证明了该算法的超线性收敛性，最后给出了该算法的数值实验结果．     

EFFECTS OF BANDGAP SHRINKAGE IN FEMTOSECOND ABSORPTION SATURATION MEASUREMENTS OF GaAs FILM

Using CPM dye laser and self-mode-locked Ti sapphire laser as pump-probe optical sources, the effects of bandfilling and bandgap shrinkage on the femtosecond absorption saturation spectra of GaAs film have been studied, For exciting photon energy of 1.97eV and carrier density of 1×10¹⁸cm^-3, an optical-induced absorption increase is observed and is attributed to bandgap shrinkage, The dependence of the absorption coefficient change on the carrier temperature and the carrier densities is discussed.     

Solvent Suppression in Intermolecular Magnetic Resonance Spectra Multiple-Quantum Coherence Nuclear with Only z-axis Gradients

The solvent peak in the intermolecular multiple-quantum coherence spectra can be suppressed by either applying pulse field gradients or spinning sample along the magic angle direction （φ = 54.7）. However, these two methods also suppress the signals of the solute. We design two pulse sequences with only z-axis gradients to suppress the solvent peak without reducing the intensity of solute signals. Compared to the former pulse sequence, the latter pulse sequence is insensitive to the imperfection of pulse flip angles. When the flip angles of the second pulse sequence are purposely deviated 1/10 from the optimal values, the solvent peak is still weak. Theoretical expressions, experimental observations and computer simulations demonstrate that the two methods can be used to effectively suppress solvent peak in intermolecular multiple-quantum coherence spectra.     

毛细管电泳-核磁共振联用技术及其应用

毛细管电泳－核磁共振在线联用技术是新型的分离和生命大分子的有效手段之一。详细介绍了在ＣＥ－ＮＭＲ联用技术中最关键的ＮＭＲ对纳升数量级样品的检测技术和最新进展。     

《探索性数据分析》

原著名：ＵｎｄｅｒｓｔａｎｄｉｎｇＲｏｂｕｓｔａｎｄＥｘｐｌｏｒａｔｏｒｙＤａｔａＡｎａｌｙｓｉｓ译人员：陈忠琏、郭德嫒校译人员：杨振海书评：探索性数据分析是美国当代著名统计学家ＪｏｈｎＷＴｕｋｅｙ在本世纪６０年代开创的一个新的统计研究方向。１９６２年他发表了《ＴｈｅＦｕｔｕｒｅｏｆＤａｔａＡｎａｌｙｓｉｓ》,做了奠基性的工作。在１９７０年他出版了这个新领域的第一本专著《ＥｘｐｌｏｒａｔｏｒｙＤａｔａＡｎａｌｙｓｉｓ》。之后,Ｔｕｋｅｙ与ＦｒｅｄｅｒｉｃｋＭｏｓｔｅｌｌｅｒ和ＤａｖｉｄＣＨｏ…     

铕（Ⅲ）－β－二酮－有机碱配合物的性质研究

铕（Ⅲ）－β－二酮－有机碱配合物的性质研究吴一凡，吴星，杨玉梅，陆文兴，陈忠（扬州大学师范学院化学系，扬州２２５００２）（南京大学配位化学国家重点实验室，南京２１０００８）关键词：铕，β－二酮，有机碱配合物希土一个二酮一有机碱的配合物具有较强的发光性...     

(1R,2S,5R,8S,9R,10S)-8-甲基-4-氮杂-5-苯基-7-氧杂四环[8.2.1.0~(2,9).0(~4,8)]十三-11-烯-3-酮的合成和晶体结构

为确定内型降冰片烯酰亚胺与甲基格氏试剂反应所得加成产物的结构,合成了标题化合物(C18H19NO2)。其结构通过单晶X-射线衍射分析确定,该晶体属正交晶系,空间群为P212121,a = 6.293(1),b = 14.342(3),c = 16.357(3) 牛琕 = 1476.2(5) ?,Z = 4,Dc = 1.266 g/cm3, (MoKa) = 0.082mm-1,F(000) = 600。晶体结构用直接法解出,最终的偏离因子为R = 0.0535,wR = 0.988。由此晶体结构可确定加成产物为标题化合物,并由1H-NMR数据推测另一加成产物的结构。     

^31P NMR Studies on the Ligand Dissociation of Trinuclear Molybde-num Cluster Compounds

A series of carboxylate-substituted trinudear molybdenum dus-ter compounds formulated as Mo3S4(DTP)3(RCO2)(L), where RffiH, CH3, C2H5, CH2Cl, CCl3, R^1C6H4(R^1 is the group on the benzene ring of aromatic carboxylate ), L=pyridine,CH3CN, DMF, have been synthesized by the ligand substitu-tion reaction. The dissociation of the loosely-coordinated ligand L from the cluster core was studied by ^31p NMR. The dissocia-tion process of L is related to the solvent, temperature, and acidity of carboxylate groups, so as to affect the solution struc-ture and reactive properties of the duster. The long-distance in-teraction between ligands RCO2 and L is transported by Mo3S4 core.