面向时空嵌套关系的半结构化时空数据管理模型研究

研究了利用半结构化时空数据的"嵌套"特征实现对时空数据存储和管理的问题,提出了一种面向时空嵌套关系的半结构化时空数据管理模型.该模型以时空数据的"嵌套关系"为管理对象,用更丰富的数据语义(semantics)区别了"实体对象类"的属性、"空问嵌套关系类"的属性和"时空嵌套关系类"的属性等概念,运用非第一范武的嵌套关系数据库实现对时空数据的综合营理.基于传统关系型DBMS和GIS组件构成的软件实验系统表明,本模型简明有效,在数据更新和冗余方面均取得了较好的效果.该研究为半结构化时空数据的管理探索了一条新的途径.     

High quality p-type ZnO film growth by a simple method and its properties

P-type ZnO：N films have been grown successfully by chemical vapor deposition （CVD） using Zn4（OH）2（O2CCH3）6·2H2O as the solid source material and ZnNO3 as the doping source material. XPS, Hall-effect measurement and PL spectra were employed to analyze the structural, electrical and optical properties and study the influence of substrate temperature on the film. Results showed that with a lower substrate temperature, the film exhibited p-type conduction and its resistivity decreased when the substrete temperature increased. When the substrates temperature was 400℃, p-type ZnO films were obtained with carrier concentration of ＋5.127×10^17 cm^-3, resistivity of 0.04706 Ω· cm and Hall mobility of 259 cm^2/（V·s）; they still exhibited p-type conduction after a month. When the substrate temperature was too high, the film was transformed from p-type to n-type conduction.     

Prediction of a common neutralizing epitope of H5N1 avian influenza virus by in silico molecular docking

The H5N1 avian influenza virus （AIV） has widely spread in Asia, Europe and Africa, making a large amount of economic loss. Recently, our research group has screened a common neutralizing mono-clonal antibody named 8H5, which can neutralize almost all H5 subtype AIV ever isolated so far. Obviously, this monoclonal antibody would benefit for research and development of the universal AIV vac-cine and design of the drug against H5N1 AIV in high mutation rate. In this study, the homology modeling was applied to generate the 3D structure of 8H5 Fab fragment, and ＂canonical structure＂ method was used to define the specified loop conformation of CDR regions. The model was subjected to energy minimization in cvff force field with Discovery module in Insight II program. The resulting model has correct stereochemistry as gauged from the Ramachandran plot calculation and good 3D-structure compatibility as assessed by interaction energy analysis, solvent accessible surface （SAS） analysis, and Profiles-3D approach. Furthermore, the 8H5 Fab model was subjected to docking with three H5 subtype hemagglutinin （HA） structures deposited in PDB （ID No： ljsm, 2ibx and 2fk0） respectively. The result indicates that the three docked complexes share a common binding interface, but differ in binding angle related with HA structure similarity between viral subtypes. In the light of the three HA inter-faces with structural homology analysis, the common neutralizing epitope on HA recognized by 8H5 consists of 9 incontinuous amino acid residues： Asp^58, Asn^72, Glu^112, Lys^113, lie^114, Pro^118, Ser^120, Tyr^137, Tyr^252 （numbered as for ljsm sequence）. The primary purpose of the present work is to provide some insight into structure and binding details of a common neutralizing epitope of H5N1 AIV, thereby aiding in the structure-based design of universal AIV vaccines and anti-virus therapeutic drugs.     

N掺杂于ZnO中化合价变化的第一性原理研究

该文采用第一性原理赝势法研究了氮掺杂于ZnO中其化合价变化的情况,研究结果表明氮掺杂于ZnO中取代氧原子的氮原子其受主态并非是整数-3价,而是介于-2与-3价之间,这就说明了为什么氮掺杂所得的ZnO其p型导电较弱的原因.     

可注射型海藻酸/磷酸化壳聚糖复合水凝胶的制备及其生物相容性

将N-亚甲基磷酸化壳聚糖(NMPC)引入海藻酸钙水凝胶体系,制备了力学强度和稳定性均优于海藻酸钙和海藻酸/壳聚糖复合水凝胶的可注射型材料.通过正交实验,根据材料的力学性能、浸提液pH值和凝胶化时间的对比分析,确定了各组分质量分数为:海藻酸钠1.50%、碳酸钙0.30%、N-亚甲基磷酸化壳聚糖1.00%、柠檬酸0.30%.细胞培养和肌内植入试验表明,海藻酸/磷酸化壳聚糖(Alg/NMPC)复合水凝胶具有良好的生物相容性.     

柚皮苷半合成N-苯亚甲基柚皮素腙及细胞活性

从丰富易得的柚皮苷(Naringin)1出发,通过酸水解得到了柚皮素2.以柚皮素为先导化合物,通过4-位羰基与水合肼作用合成了中间体柚皮素腙3,进而与各种不同类型的醛缩合,合成了14个新型N-苯亚甲基柚皮素腙及类似物(4a~4n).MTT蛋白染色法体外抑制肿瘤增值活性测试显示化合物4c、4d、4h、4j、4n对胃癌细胞SGC-7901有一定的抑制作用.     

非晶N:GeSb薄膜的光致晶化及其相干声子谱表征

利用对微结构变化非常灵敏的相干声子光谱技术研究了非晶N:GeSb薄膜的光致相变特征。发现当激光辐照能流达到某个阈值时,出现了一个新的声子模,表明相变的发生。同时,退火晶化的N:GeSb薄膜也出现此新的声子模,表明激光照射的确导致了薄膜的晶化。相干光学声子谱的抽运能量密度依赖实验结果表明光致晶化的N:GeSb薄膜的相干光学声子的寿命和频率均随抽运能量密度增加而减小,与晶体中的依赖关系一致。结果表明N:GeSb薄膜的光致晶化质量较好,具有相变光存储应用潜力。     

含钛物料中护炉有效钛含量的控制模型

研究了含钛炉料在高炉炉缸内的还原行为及其对炉缸的保护机制,在此基础上建立了渣铁中有效钛含量的控制模型.根据高炉的实际生产参数实时计算炉渣中的有效TiO2含量、铁水中TiC析出的临界Ti含量及对应的析出温度,从而指导生产实践,为护炉过程参数的选取提供理论依据.在文中给定的生产参数条件下,计算出炉渣中有效TiO2含量(质量分数)应控制在08%~10%,能达到护炉效果的铁水中Ti含量(质量分数)应控制在011%~014%,并分析了铁水成分对TiC析出的影响.     

工程档案在核电厂设备质量验证中的应用

该文以某核电厂设备为例,介绍完工报告、监理文件以及存档试样等工程档案在设备质量再验证中的应用.     

P层厚度对InGaN单结太阳电池的影响

采用基于第一性原理和太阳电池基本方程的wxAMPS软件,在理想情况下,模拟计算了单结In0.65 Ga0.35 N太阳电池的光电特性。计算结果表明：当p层厚度从130 nm逐渐增加到220 nm时,入射的光子吸收能量减少,从而产生的光生载流子数目减少,进而引起了开路电压、短路电流密度以及电池的转换效率均逐渐减小,但是填充因子却反而逐渐增大,为对单结In0.65 Ga0.35 N太阳电池的设计提供了理论的参考依据。