Analysis and Design of Management Accounting System in a Commercial Bank Based on Data Warehouse

随着移动互联网、云计算、物联网技术和业务的发展，数据呈现爆炸性增长，且日益成为商业银行的重要资产，不断去改写银行的运营规则与竞争格局，而数据仓库技术的发展则为充分发掘数据价值提供了基础条件。数据仓库按主题集成来自各个业务系统的海量数据，建立商业银行内部统一的信息视图，从而为应用创新提供有效的平台支持与数据支持。数据仓库解决了商业银行数据集成的问题，随之也解决了基于数据快速进行业务决策的问题。 管理会计系统是一个重要的基于数据仓库的决策支持系统，适应了商业银行以客户为中心开展综合化、精细化经营管理的需要，成为增强商业银行竞争优势的利器。银行数据仓库的设计与管理，只有遵循科学的方法论，才能满足当...With the explosive growth of Mobile Internet, Cloud Computing, "Internet of Things", they are becoming an important asset for the commercial banks which has revised the bank operation rules and competition pattern, while the development of data warehouse technology is becoming the foundation for fully exploiting the data value. Data warehouse integrate mass data which is from various of business ...学位：工程硕士院系专业：软件学院_软件工程学号：X201323233

Electrochemically shape-controlled formation of concave AuPd alloy nanoparticles on ITO substrate

运用电化学方波电位法, 在氧化铟锡(ITO)透明导电膜玻璃基底上实现AuPd纳米粒子的形状控制合成. 当固定方波下限电位0.30 V,; 上限电位分别为0.64和0.70 V时, 分别制备出内凹三八面体(TOH)和内凹六八面体(HOH) AuPd合金纳米粒子.; 运用扫描电镜(SEM)、X射线能量散射谱(EDX)和电化学循环伏安法表征所制备的纳米粒子, 结果表明所制备的AuPd纳米粒子在ITO上分散均匀,; 具有清晰的内凹三八面体和内凹六八面体的形状, Au:Pd元素比均接近3:1. 但由于Au比Pd的表面自由能低,; 导致Au在AuPd合金纳米粒子表面富集.发现从合成的TOH AuPd合金纳米粒子出发, 对其施加下限电位0.30 V、上限电位0.70; V的方波电位处理, 可实现由TOH向HOH形状转变; 延长方波电位处理时间仅改变AuPd合金纳米粒子的尺寸, 但HOH形状保持不变.Shape-control of AuPd alloy nanoparticles (AuPd NPs) substrated on; indium-tin oxide (ITO) was successfully achieved, for the first time, by; using electrochemical square-wave-potential (SWP) method. Concave; trisoctahedral AuPd alloy NPs (TOH AuPd NPs) and concave hexoctahedral; AuPd alloy NPs (HOH AuPd NPs) were prepared under SWP conditions with; lower potential of 0.3 V while different upper potentials of 0.64 and; 0.70 V, respectively. Different techniques including SEM, EDX and; electrochemical cyclic voltammetry were employed to characterize the; morphology and composition of AuPd alloy NPs. The results demonstrated; that the as-prepared TOH AuPd NPs and HOH AuPd NPs are uniform in shape; of correspondingly concave TOH and concave HOH, and are well dispersed; on the ITO substrate. The composition in terms of and Au:Pd atomic ratio; of both TOH and HOH AuPd alloy NPs is determined by EDX around 3:1.; However, a surface enrichment of Au on the AuPd NPs was observed, and is; ascribed to the lower surface energy of Au in comparison with that of; Pd. It has been found that, starting from the as-synthesized TOH AuPd; NPs, shape transformation from TOH to HOH can be accomplished by; applying a treatment of square wave with lower potential of 0.3 V and; upper potential of 0.7 V. Prolonging the treatment time results in; increasing the size of AuPd NPs, while the HOH shape is preserved.国家自然科学基

Modulation Recognition Method of Non-cooperation Underwater Acoustic Communication Signals Using Principal Component Analysis

由于信道传输特性、信噪比低等因素的影响,非合作水声通信信号的调制识别极具挑战性。对信号功率谱、平方谱进行主分量分析,提取代表不同类型调制信号特有信息的主分量作为特征参数,从而降低特征参数维度、抑制噪声影响,并在此基础上设计一种基于人工神经网络的水声通信信号调制方式分类器。海上实录信号数据的识别实验结果表明了该方法的有效性。The modulation classification of the non-cooperation underwater acoustic communication signals is extremely challenging due to channel transmission characteristics and low signal-to-noise ratio. The principal component analysis( PCA) is used to analyze the power spectra and square spectrum features of signals,which is capable of extracting the principal components associated with different modulated signals as input vector,thus reducing the feature dimension and suppressing the influence of noise. An artificial neural network( ANN) classifier is proposed for modulation recognition. The experimental modulation classification results obtained from field signals in 4 different underwater acoustic channels show that the proposed modulation recognition method has good classification performance.国家自然科学基金项目(11274259、11574258

Preparation and electrochemical performance of 3D net structure silicon film anode in lithium-ion batteries

采用磁控溅射方法,以泡沫镍为导电基底,制备锂离子电池三维网状结构硅薄膜负极材料,并研究其电化学性能.结果显示,当硅薄膜的厚度为200 nM时,三维网状结构硅薄膜负极材料表现出良好的循环性能和倍率性能,以800 MA/g的电流充放电时,首次放电容量高达4060MAH/g,循环300周后容量保持在1704 MAH/g;充放电电流为4200 MA/g(1 C)时,首次放电容量为2940 MAH/g,循环300周后容量为1472 MAH/g;当充放电电流增大到21 A/g(5 C)时,放电容量仍高达1294 MAH/g.增加硅薄膜的厚度到600 nM,虽然其循环性能有所下降,但仍然保持优良的倍率性能.与平板硅薄膜材料相比,三维网状结构硅薄膜材料有效地缓解了硅在充放电过程中的体积变化,从而具有优异的电化学性能.The 3D net structure silicon film anodes were prepared by magnetron sputtering method on a foam nickel substrate.Excellent electrochemical performances of these 3D net structure silicon film anodes are demonstrated.When the thickness of silicon film is 200nm, the discharge capacity is 4060 mAh/g in the first cycle, and it retains 1704 mAh/g after 300 cycles at a charge/discharge current of800 mA/g.Even the current is increased to 4200 mA/g(1 C), the discharge capacity is still as high as 2940 mAh/g in the first cycle, and retains 1472 mAh/g after 300 cycles.When the thickness of silicon film is increased from 200 to 600 nm, the cycle performances of this 3D net structure silicon film anode decline in a certain degree, while it still maintains a better cycleability and rate capability than the panel silicon film with the same thickness.The improved electrochemical performances are attributed to that the 3D net structure can obviously restrain the volume change of silicon material during the insertion/extraction processes of lithium ion.国家自然科学基金委员会创新研究群体科学基金(21021002); 国家高技术研究发展计划(2011AA11A254); 中央高校基本科研业务费(2012121035)资

Mechanism of Functional Molecules in Shape-Control Synthesis of Noble Metal Nanocrystal Catalysts

金属纳米晶催化剂(简称金属纳米催化剂)广泛应用于化学、能源等现代工业。铂等稀贵金属目前仍然是燃料电池等领域不可替代的催化剂材料,进一步提高金属催化剂的性能和利用率一直是重大挑战。金属的表面结构取决于晶体的形状。因此,形状控制合成可有效地调控金属纳米晶催化剂的表面结构和性质,近年来得到了大量研究。功能分子(保护剂、稳定剂、表面活性剂、添加剂等)对金属纳米晶的形状控制合成具有重要作用,尤其是在湿化学法形状控制合成中。深入认识功能分子在形状控制合成中的作用机理,可为理性地设计和制备具有特定功能的纳米催化剂提供指导。功能分子通常是通过在纳米晶核特定晶面上优先吸附,或刻蚀某些特定的晶面,或者加速或抑制某些晶面的生长实现对纳米晶催化剂表面结构的调控。虽然通过结构控制合成的电化学法和湿化学法已经制备出大量不同表面结构的金属纳米晶催化剂,但是对功能分子作用机理的认识还远未深入。本文综述了近二十年金属纳米晶催化剂形状控制合成的进展,侧重阐述对功能分子作用机理的研究,总结了功能分子在金属纳米晶催化剂形状控制合成中优先吸附的重要作用机制,以及优化功能分子在纳米粒子形状控制合成中的一些基本策略。Metal nanocrystal catalysts(abr.metal nanocatalysts) are widely used in chemical and energy industries.The rare and precious metals as platinum are actually irreplaceable materials for catalysts,therefore to improve the activity and utilization efficiency of metal catalysts is always a challenge.Shape-control synthesis is an efficient way to tailor the surface structure of metal nanocrystal and therefore create particular functions in catalysis.The functional molecules such as stabilizers,capping agents,surfactants and additives,etc.,are indispensable in the shape-control synthesis,especially in the wet chemistry route.In order to rationally design and synthesize metal nanocatalysts with high activity,high selectivity and high stability,it is important to explicit the roles and mechanisms of functional agents in shape-control synthesis.The functional agents usually assist in shape-control synthesis of nanocrystals through preferential adsorption on specific crystal facets,or etching particular crystal planes,or accelerating / inhibiting certain crystal growth directions.Although a mass body of metal nanocrystals with different shape have been synthesized,the explicit roles and mechanism of functional molecules in the shape-control synthesis are poorly defined and a full understanding is still elusive.The current paper reviews mainly the recent progress made in studies of mechanism of functional molecules in shape-control synthesis of metal nanocatalysts in the last two decades.The mechanism of preferential adsorption of functional agents and some basic strategy of optimizing the use of functional molecules in shape control synthesis of noble metal nanocatalysts are summarized.国家自然科学基金“界面电化学”创新研究群体项目(No.21021002)资

Development of cathode material LiFePO_4 in lithium ion battery

[中文文摘]LiFePO4作为一种新型的锂离子电池正极材料,安全性好,价格低廉,环境友好,循环性能稳定。结合本实验室的研究工作,从合成方法,表征手段,循环性能和电导率等方面综述了近年来LiFePO4的发展概况,并提出了LiFePO4进一步可能的发展趋势。[英文文摘]As a cathode material of lithium ion battery, LiFePO4 possesses some excellent characteristics such as good safety, low cost, environment friendly and satisfactory cycle stability. In this paper, the development of LiFePO4 in recent years is discussed in terms of synthesizing methods, characterization ways, cycling performance and electronic conductivity. The prospect of LiFePO4 in the future is also presented.973项目(2002CB211800); 国家自然科学基金(20373058); 福建省科技项目(2003H044)资助

A high-performance alginate hydrogel binder for the Si/C anode of a Li-ion battery

NSFC [21373008, 21321062]; NFFTBS [J1310024]; Xiamen Science and Technology Project [3502Z20133002]An alginate hydrogel binder is prepared through the cross linking effect of Na alginate with Ca2+ ions, which leads to a remarkable improvement in the electrochemical performance of the Si/C anode of a Li-ion battery

Preparation of PdCoIr Tetrahedron Nanocatalysts and Its Performance toward Ethanol Oxidation Reaction

钯(Pd)基催化剂是直接乙醇燃料电池研究中广泛使用的催化剂,进一步提升其性能是推动燃料电池发展的重要方向。本文用一步水热法制备出四面体结构PdCo(PdCo tetrahedron,记为PdCo-TH)和少量铱(Ir)掺杂的PdCo四面体合金纳米粒子(记为PdCoIr-TH)。经TEM、ICP、XPS及CV等表征证实,PdCoIr-TH为三元合金纳米粒子,且掺杂的Ir元素倾向分布在催化剂表层。相比于商业Pd/C催化剂,PdCo-TH/C和PdCoIr-TH/C对乙醇电氧化的催化性能显著增强。研究结果表明,Pd9Co1Ir0.1-TH/C在低电位(< -0.25 V)下具有最高的乙醇电氧化活性和稳定性。Ir掺杂不仅提高了催化剂抗CO毒化的能力还有利于乙醇起始氧化电位负移。同时,随着Ir含量的增加,所制备的纳米催化剂的乙醇电氧化C1产物选择性也随之升高。针对不同组成催化剂反应性的差异,本文认为Co与Ir位点上容易产生OHad物种,这将有利于活性Pd位点上乙醇电氧化中间反应物种的有效转化。除了以上的各位点间的协同效应,三元合金的形成,进一步调控了Pd的d带电子结构,从而促进了催化剂反应性的改变。As a new energy conversion device, direct ethanol fuel cells (DEFCs) are widely concerned because of their remarkable advantages such as high theoretical energy density and wide fuel sources. However, the rapid development of DEFCs has been severely impeded due to the sluggish kinetic process and toxic intermediates especially in their anodic reactions. Palladium (Pd)-based materials are considered to be excellent anode catalysts for DEFCs, especially under alkaline conditions. And further improving their performance is an important direction to promote the development of DEFCs. Surface structure and composition are the key factors affecting the performance of catalysts which can be improved by reasonable regulation. It is reported that high-index faceted structures and element doping are beneficial to improve the performance of catalyst. In this work, the advantages of these two strategies were used comprehensively to prepare Pd-based catalysts with high efficiency. Palladium cobalt (PdCo) and Ir-doped PdCo tetrahedron alloy nanocatalysts (denoted by PdCo-TH and PdCoIr-TH, respectively) have been successfully prepared by one-step hydrothermal method. The characterization results of TEM, ICP, XPS and CV show that the PdCo-TH binary and PdCoIr-TH ternary alloys were formed, while Ir element was mainly distributed on the PdCoIr-TH surface. Compared with the commercial Pd/C, the PdCo-TH/C and PdCoIr-TH/C exhibited the enhanced catalytic properties toward ethanol oxidation reaction in alkaline solutions. Particularly, the Pd9Co1Ir0.1-TH/C catalyst showed the best activity and stability toward EOR, especially at low potentials (< -0.25 V). And Ir sites not only resisted CO poison effectively, but also shifted the initial oxidation potential of ethanol negatively. Meanwhile, the selectivity of C1 products during the electrocatalytic oxidation of ethanol has been greatly improved with the increase of Ir content. The enhanced reactivities of PdCo-TH/C and PdCoIr-TH/C could be attributed to: (a) The coexistence of Co sites and Ir sites on the surfaces can generate OHad species which can promote the oxidation of intermediate adsorbed species on Pd sites and (b) the negative shift in electron binding energy of Pd due to the addition of Ir may make reaction intermediates desorb more difficultly, which might make the reactivity of PdCoIr-TH/C differ from that of PdCo-TH/C. This research work has demostrated a strategic approach for future development in high efficiency catalysts used for DEFCs.国家自然科学基金项目(21802112);国家自然科学基金项目(21773198)通讯作者:黄蕊,孙世刚E-mail:[email protected];[email protected]:RuiHuang,Shi-GangSunE-mail:[email protected];[email protected]厦门大学化学化工学院,固体表面物理化学国家重点实验室,福建 厦门 361005State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, Chin

中国建设社会主义新农村的思考——四川建设社会主义新农村模式初探

本文根据四川的资源、人口、环境现状,借鉴发达国家现代农业发展的经验,设计了依靠科技进步,建设社会主义新农村的模式。采用7+3+1+1土地科学规划方案,克服小农经营的弊端,建设适度规模商品粮、畜、果、蔬、花卉基地农业,配合农副产品加工产业的建设,逐步建设现代农业,促进“生产发展”。通过改善生活环境、居住条件、落实增收措施与建立社保四个方面实现生活宽裕,既用现代自然科学技术解决都市新村人与自然和谐的问题,又用古今中外社会和谐的理念,创造适合现代社会的社会主义和谐文化模式,实现“乡风文明”。通过土地、农宅地的

双模态过渡池沸腾实验研究

利用控制加热电压和加热面平均温度两种方法，实验研究了常压（0．1MPa）、室温（16℃）条件下除气后的R113在直径60μm细铂丝表面的池沸腾传热现象，观测了单相对流、核态沸腾、双模态过渡沸腾和膜态沸腾4种传热模式中的汽相分布及其传热特征，发现充分发展的核态沸腾传热曲线、膜态沸腾传热曲线及临界热流的数值分别与文献中常用关联式的预测一致，而核态沸腾和膜态沸腾共存的稳定双模态过渡沸腾曲线被一极小值点分为两个连续分支，邻近膜态沸腾的右支上热流与过热度成正比，而邻近核态沸腾的左支上热流则随过热度增长而下降，并且只出现在加热面平均温度受控的实验中