Fabrication and characterization of two-dimensional Au lattices

二维结构材料因其独特的对称性和缺失的第三维度具有与体材料截然不同的物理性质，包括独特的能带结构、优异的电学性能以及拓扑保护的表面态等；其固有的柔韧性、坚固性以及超薄等特点，还使得二维结构材料拥有良好的机械属性。这些新奇特性使得二维结构材料在信息领域具有广阔的应用前景，成为当今最热门的研究课题之一。而如何在广泛应用于半导体器件的硅基结构上制备稳定有序的二维材料进而实现器件上的开发和应用，成为人们日益关注的科学问题。因此，本论文着重针对硅基二维金属晶格的制备、结构表征以及性质探索等几个方面展开系统研究，具体包括以下三个部分： 1.研究Si(111)-7×7表面上Au二维晶格的可控制备和原子构型。...The nature of two-dimensional (2D) materials, such as their unique symmetry and the reduced dimensionality, leads to the appearance of phenomena that are very different from their bulk materials, such as the novel band structures, electronic performance and topologically protected surface states. These materials also play an entirely mechanical role as they are inherently flexible, strong, and ex...学位：理学博士院系专业：物理与机电工程学院_凝聚态物理学号：1982010015401

Design and Implementation of Trade Enterprise’s Invoicing System Based on .NET

随着信息技术的不断发展，企业也非常重视进销存信息系统对企业的支撑作用，财力投入从原来的几万元逐步提高到几十万，进销存管理也开始走向成熟阶段，围绕进销存管理开展信息化产品研发已经成为信息化企业的战略布局。 进销存系统是一个以采购管理、销售管理、库存管理为核心，通过整合企业资源帮助企业管理者改善企业运营水平，提高企业核心竞争力的管理信息系统。 论文首先介绍了进销存系统的现状和发展趋势，介绍了课题研发过程中使用到的方法和关键技术，比如UML语言与要素、用例图、活动图以及软件体系结构等。然后进行需求分析，需求分析主要由可行性、用例、功能需求、性能需求和数据需求组成。接着进行系统设计，设计部分主要包...With the constantly development of information technology, enterprises have attached great important to the effect of invoicing information system on supporting the enterprises, and the financial resources have also been continually invested in, as a result, the invoicing management also has begun to move toward a mature level. The research and development on the informationization products which ...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201323026

Identification of Pygopus-2’ s Interacting Proteins by Tandem Affinity Purification

摘要 Pygopus2（Pygo2）是2002年发现的，为Wnt信号通路中ß-catenin的下游功能蛋白。Pygo2有两个独特的保守结构域，即N端的NHD结构域和C端的锌指结构模体PHD。已有研究证明，Pygo2的PHD结构域可通过Lgs/BCL9与ß-catenin结合。而NHD结构域则被认为在无PHD存在下可激活Wnt靶蛋白的转录。从整个蛋白上看，PHD与Lgs/BCL9的结合可增强基因的转录，通过以下两种方式：1）把NHD带至β-catenin/LEF转录复合体或靶基因上，推动转录的进行。2）把ß-catenin锚定在核内，以提高β-catenin...Abstract Pygopus2 (Pygo2) was first found in 2002 as a functional protein in Wnt signaling pathway and dowmstream partner of ß-catenin. Pygo2 protein have two distinct conserved domains, an N-terminal homology domain (NHD) and a C-terminal PHD zinc finger motif. Pygo binds to the N-terminal domain of β-catenin via Lgs/BCL9 through its PHD domain. The NHD motif can activate Wnt target genes ...学位：理学硕士院系专业：生命科学学院生物医学科学系_生物化学与分子生物学学号：2012005130212

Studies on the Super-Stabilization of RMB Nominal Exchange Rate

1994年汇率并轨以来，人民币名义汇率超稳定使我国的汇率制度由名义上的管理浮动制演变为实际上的固定钉住制，这与特殊的汇率形成机制有关，这种机制包括经常项目下的强制结售汇、严格的资本管制、外汇市场交易约束和频繁的市场干预。但更重要的原因还在于汇率稳定有坚实的经济支撑，均衡汇率模型测算结果显示，近年来人民币实际有效汇率是基本均衡的，虽然从中期来看受美元不断走弱的带动，人民币有所低估，但从长期来看，却是高估的，因此，低估论缺乏依据。 定量分析结果显示，虽然人民币实际有效汇率与我国出口和FDI负向相关，但却与贸易差额正向相关。这意味着，1994年以来我国贸易持续顺差和经济持续增长所依靠并不是人民币低...Abstract Since the reform of exchange rate regime in 1994, the NER super-stabilization makes our exchange rate regime convert from nominal managed floating to actual fixed peg. This is related to special exchange rate formation system, which include compulsory purchase and sale of forex in current account, rigorous capital supervision, trade restraint and frequent intervention in forex market. Bu...学位：经济学博士院系专业：经济学院金融系_金融学(含保险学)学号：B20011203

Comparison of the determination of TP and TN using national seawater method and surface water method

应用国家的海水分析方法(流动注射分析法)和地表水分析方法测定珠江口不同盐度的海水样品中的总磷和总氮,分别进行精密度试验和准确度试验,并对两种国标方法进行比较。实验结果表明,两种方法无显著性差异。流动注射法适用于任何盐度海水中总磷和总氮的测定,且方法具有检出限低、环保、高效等优点。The concentrations of total phosphorus( TP) and nitrogen( TN) in different salinity samples in Pearl River estuary were determined by using national seawater analytical method and surface water analytical method,respectively. The accuracy and precision of the two methods were investigated,and the concentrations of TN and TP in different salinity were compared by using the two methods. The experimental results indicated that the two methods showed no significant difference. But the seawater analytical method by using flow injection( FI) showed lower detection limit,more environment friendly and higher efficiency than that of the surface water analytical method.国家海洋局环保司2011年度《珠江口海洋环境质量综合评价方法》(DOMEP(MEA)-03-01);; 国家自然科学基金青年基金(41406093);; 广东省教育厅科技创新项目(2013KJCX0103);; 广东省科技计划项目(2013B090600033

线粒体质量控制在外源化学物引起坏死性凋亡中的作用

坏死性凋亡是一种可调控的、半胱氨酸天冬氨酸蛋白酶(Cysteine aspartic acid specific protease,Caspase)非依赖的程序性细胞死亡,相较于细胞凋亡,其主要特点是没有核固缩和气球样变,而出现的是线粒体肿胀和三磷酸腺苷(Adenosine triphosphate,ATP)耗竭、胞质肿胀和空泡形成,其最终引起质膜破裂和通透性改变,释放损伤相关分子,如白细胞介素1α、高国家自然科学基金(81573181,81472997);;福建省自然科学基金(2015J01344

假性妊娠的心理特点初探

一假性妊娠,又称想象怀孕,虽然在妇产科临床上并不多见,但作为心身关系的典型现象,却已久受关注。公元前三百年,古希腊医学家希波克拉底(Hippocrates)就曾报道过十二个病例。1937年,G.D.Biren和M.P.Klinger合写的研究假性妊娠的专著出版,报道了444个病例。年龄从7岁到79岁。1960年以来,英文文献中,报道假性妊娠平均一年一例。病人有已婚者,也有未婚者。有的病人恢复很快,继而得子。有的却从结婚

Research progression of environmental endocrine disrupting chemicals

目的了解环境内分泌干扰物潜在的健康和生态效应。方法查阅本领域国内外文献并进行综述。结果环境内分泌干扰物主要是通过人类的生产和生活活动排放到环境中的有机污染物,通过干扰生物或人体内保持自身平衡和调节发育过程天然激素的合成、分泌、运输、结合、反应和代谢等,从而对生物或人体的生殖、神经和免疫系统等的功能产生影响,使人类、家畜和野生物种的健康遭受不利影响。结论环境内分泌干扰物的快速筛选方法、剂量一效应关系、生物指标体系、模式动物是环境内分泌干扰物研究急需解决的几个主要问题。Objective To explore the potential health and ecological effect of environmental endocrine disrupting chemicals( EDCs).Methods Some domestic and foreign latest articles in the subjects were serched and reviewed.Results The EDCs are organic contaminant that are discharged by production and living activity of human. Having influence on generate,nerveous and immune system of living being and human being and having adverse effect on heath of human being ,domestic animal and wild species through interfering self balance and regulating synthesis, secretion,transportion,combination,reaction and metabolism in development.Conclusion The fast screening technicke ,dose-effect relation,being living index system,mode animal of EDCs are emergency to be solved in the research

应用差示扫描量热法快速鉴别4种中药配方颗粒

目的利用差示扫描量热法（DSC）对三七、西洋参、人参、红参四种配方颗粒进行分析鉴别,弥补传统鉴别方法鉴别中药配方颗粒的局限性。方法收集三七、西洋参、人参、红参4种配方颗粒,共计20批样品,通过考察确定实验的升温范围、升温速率,用DSC图谱区分这4种中药配方颗粒。结果确定了使用DSC快速鉴别4种中药配方颗粒的最佳实验条件:升温范围30～400℃;升温速率30℃·min-1。在该条件下4种中药配方颗粒特征峰温、峰数都存在明显区别。结论 DSC具有操作简便、测量快速、重现性好、谱图易解析和样品用量少等优点,是一种可以快速鉴别4种中药配方颗粒的新方法

Design and measurements of the high gradient accelerating structures

The purpose of this thesis was to study on design and measurements of the high gradient accelerating structures. After introducing the main parameters to characterize Linacs we explained the application of the periodic accelerating structure. Then we studied TW accelerating structure operating at K-band frequency in order to linearize longitudinal space phase to increase beam brightness in the framework of the Compact Light XLS project in order to produce hard x-ray. We estimated group velocity as a function of frequency both analytically and numerically. Analytical results have a good agreement with the numerical results. The main parameters such as shunt impedance, quality factor (Geometric factor) and R/Q independently from the operating frequency for the TM010, TM110 and TM011 for a single cylindrical “pill-box” have been determined analytically as they provide accurate model for the accelerating structures. In order to characterize a normal conducting high accelerating structure with maximum gradients operating at X-band with extremely low probability of RF breakdown, an electroformed SW structures has been fabricated and characterized by SLAC and INFN with collaboration of other institute around the world at 11.424 GHz, coated with Au-Ni. We designed a gold plate RF high gradient structure operating at the X- band coated with Au-Ni. Bench measurements have been performed in the Department of SBAI of the University of Rome “La Sapienza”. The Slater method for the SW cavity has been employed in order to quantify the electric field inside the structure. Comparing the results with the results exposed from HFSS we report the features that have been quantified, showing good agreement. We continued working on the perturbation effect due to the aperture coupled between a waveguide and a cavity but for our application in SW multi-cell high gradient accelerating structure we studied on theoretical approach for reflection coefficient calculation in a SW cavity coupled to a waveguide. One method was based on circuit theory in which we found the overall Q of a resonant circuit for a cavity coupled to an external waveguide containing the RF generator. Q calculation led to the determining of the shunt impedance and consequently the reflection coefficient calculation. Comparison of the results shows a good agreement with the numerical results carried out by using the numerical code, HFSS. Another method of reflection coefficient calculation has been accomplished. We applied the modified Bethe’s theory presented by Collin and developed by De santis, Mostacci and L.Palumbo for TM01 mode cavities coupled by a small hole with a thickness size comparable to the wavelength. The amplitudes of forward and backward waves due to polarizabilites have been determined and we found equations for reflection and transmission coefficients. We demonstrated that our equation for reflection coefficient calculation is an analogous of the reflection coefficient obtained by Collin for TE10 using the circuit theory