电炮驱动Mylar膜飞片完整性实验研究

利用铜靶验证法研究了加速腔材料、结构以及桥箔尺寸与加速腔尺寸的匹配关系等因素对电炮驱动飞片完整性的影响。实验结果表明,对于每秒数公里的高速下,加速腔材料、预制刃口与否对飞片的完整性影响不大,当加速腔尺寸稍小于桥箔尺寸时能够获得非常完整且呈圆形的飞片。光纤探针测量结果显示,此条件下,飞片具有较好的平面度,从该角度讲,电炮是一种较好的平面波发生器。     

反相离子对高效液相色谱-电感耦合等离子体质谱法测定富硒酵母中硒

富硒酵母样品用pH 7.5的Tris-盐酸缓冲溶液经超声破碎提取30min,于提取液中加链霉蛋白酶E在37℃搅拌18h,高速离心分离。取上清液经Millipore Corp超滤膜过滤,滤液中无机硒(Ⅵ及Ⅳ)和有机硒,即硒代半胱氨酸、硒代尿素和硒代蛋氨酸通过Waters Symmetry ShieldRP18色谱柱分离。用不同比例混合的甲醇-七氟丁酸溶液作流动相进行梯度洗脱,用电感耦合等离子体质谱法在线测定洗脱液中各种形态硒的含量。5种形态硒的质量浓度均在100μg·L-1以内呈线性。应用此法分析了富硒酵母样品,结果表明:无机硒占总硒量的1.63%,65%的硒以易被人体吸收的硒代蛋氨酸形式存在。     

Offner成像光谱仪建模及像差分析

利用光线追迹方法得到系统的数值模型,然后运用级数展开方法,建立起系统的3阶解析模型,亦即3阶像差理论.该模型给出系统像差系数和计算系统点列图的解析表达式,可适应于包含变间距凸面光栅的系统,并具有良好的扩展性.通过追迹示例Offner系统中10000条不同波长、不同高度的光线,结果表明运用解析模型可以快速而准确地生成系统...     

层层组装构建蛋白质基多层结构及其生物医用研究进展

对蛋白质基自组装多层结构的发展和生物医学应用进行了综述。详细介绍了蛋白质多层结构的组装原理、组装基元类型、不同物理结构如涂层、微胶囊和纳米管的制备技术。阐述了蛋白质多层结构在抗凝血、抗菌、生物活性涂层、药物控释和生物分离方面的应用。最后对蛋白质基组装体系的优势进行总结,对其进一步的发展方向作了展望。     

Synthesis, Structure and Physical Properties of a Barium（II） Complex with 5-Sulfoisophthalic Acid Sodium

An alkaline earth metal-organic framework [Ba(Hsip)(H2O)4]n (1, NaH2sip = 5-sulfoisophthalic acid sodium) has been constructed, and characterized by single-crystal X-ray diffraction. In complex 1, each Ba(II) atom coordinates to one ligand Hsip3- and four water molecules with a distorted nine-coordinated monocapped tetragonal antiprism geometry. Each Hsip2- anion acts as a μ3-bridging ligand, in which two carboxylate groups adopt the same bidentate chelating coordinating model and the sulfonate group takes a monodentate coordinating model, resulting in a wave-like two-dimensional network with a (6, 3) topological structure. The two-dimensional networks are further linked by O-H···O to form a three-dimensional structure. Luminescent property and thermal stability of complex 1 are investigated. 1 belongs to the orthorhombic system, space group Pna21 with a = 7.3333(2), b = 16.7044(3), c = 10.4817(2), Z = 4, V = 1283.99(5)3, Mr = 453.58, Dc = 2.346 g/cm3, F(000) = 880, μ = 3.314 mm-1, the final R = 0.0261 and wR = 0.0592 for 2425 observed reflections with I > 2σ(I).     

羧酸对CaCO3晶型的影响

分别用2,2'-联苯二酸(bpdca)和1,2,4,5-苯四酸(btca)作为调控剂合成CaCO3,使用XRD、FT-IR和扫描电子显微镜(SEM)研究了羧酸对CaCO3晶型和形貌的影响.结果表明,2,2'-联苯二酸和1,2,4,5-苯四酸作为调节剂对CaCO3晶型都会有影响,一定条件下合成得到的是方解石和球霰石的混合物,显示出羧酸对球霰石的生成具有促进作用.     

High-pressure Raman study of solid hydrogen up to 300 GPa

The high-pressure behavior of solid hydrogen has been investigated by in situ Raman spectroscopy upon compression to 300 GPa at ambient temperature. The hydrogen vibron frequency begins to decrease after it initially increases with pressure up to 38 GPa. This softening behavior suggests the weakening of the intramolecular bond and the increased intermolecular interactions. Above 237 GPa, the vibron frequency softens very rapidly with pressure at a much higher rate than that of phase III, corresponding to transformation from phase III into phase IV. The phase transition sequence has been confirmed from phase I to phase III and then to phase IV at 208 and 237 GPa, respectively. Previous theoretical calculations lead to the proposal of an energetically favorable monoclinic C2/c structure for phase III and orthorhombic Pbcn structure for phase IV. Up to 304 GPa, solid hydrogen is not yet an alkali metal since the sample is still transparent.     

淀粉-丙烯酸钠接枝共聚物的固体高分辨核磁共振研究

运用固体高分辨核磁共振技术,通过测量13C魔角旋转/交叉极化(CP/MAS)谱、1H自旋-晶格弛豫时间T1及旋转坐标系中的自旋-晶格弛豫时间T1ρ,对一系列淀粉-丙烯酸钠接枝共聚物的相结构进行了研究,并与淀粉、均聚丙烯酸钠及两者共混物的实验结果进行了比较.结果表明,接枝共聚导致了淀粉结晶度的明显降低;在共混物和接枝共聚物中,淀粉和聚丙烯酸钠组分都具有纳米尺度的相容性,由于接枝的效应,接枝共聚物中两个组分表现出比共混物更高的相容水平.     

三维无机-有机杂化骨架微孔材料Cd(HBTC)(EG)·8(H2O)的合成与结构

由于无机-有机杂化微孔晶体材料在选择性催化、分子识别和可逆性主客体分子(离子)交换等方面存在潜在的应用前景,已经越来越引起人们的广泛注意.传统的沸石和分子筛微孔晶体材料以硅酸盐、硅铝酸盐、磷铝酸盐和无机金属磷酸盐为骨架,新型的无机-有机杂化微孔晶体材料用刚性和热稳定性较好的有机分子和金属离子作为结构单元.均苯三甲酸(H3BTC)是常用的含氧有机配.     

三维无机-有机杂化微孔化合物Mn3(BTC)2(DMF)4的合成与结构

传统的沸石和分子筛微孔晶体材料是指以硅酸盐、硅铝酸盐、磷铝酸盐和无机金属磷酸盐为骨架的晶体材料．近年来,利用刚性和热稳定性较好的有机分子(如芳香多酸和多碱)和金属离子作为结构单元制备出了新型的无机一有机杂化微孔晶体材料．这类晶体材料能够在去除孔道中的溶剂分