Effects of chemical treatment on the ORR activity of Fe/N/C electrocatalyst and study of active sites

燃料电池是一种具有发展前景的清洁转化装置，但受制于Pt等贵金属催化剂导致的高成本无法商业化。燃料电池阴极的非贵金属Me/N/C催化剂由于来源广，成本低，合成方法简单，成为目前的研究热点。但当前不同研究组使用不同的前驱体，只要优化合成条件都可以得到活性和稳定性相当的催化剂，这使得目前研究者对提高催化剂性能遇到了瓶颈。更多的研究者希望依据高活性的活性位的确定来理想设计制备具有高密度和高数量的活性位点的催化剂。活性位点的本质确定对合理设计催化剂来说是十分重要。但催化剂活性位点仍然处于争论状态，包括活性位中是否包含中心金属离子，金属离子对活性位的作用，及可能的催化活性位的组成，具有较高的研究价值。 ...The fuel cell as the most promising reformer has an extraordinary research value, but it can not be commercialized that be subject to precious metals. Due to the wide materials, low cost, simple synthesis methods, non-precious metal Me / N / C catalyst as the fuel cell cathode catalyst, become the hotspot. While even the use of different precursors, catalyst activity and stability may be of the sa...学位：理学硕士院系专业：化学化工学院_物理化学学号：2052013115165

Concrete Realization and its Benefits of News Management System

该系统结构合理,功能完善,实现了新闻的动态管理,采用前台浏览和后台管理双层架构,前台部分包括用户登陆、新闻浏览及发布功能,后台管理则包括新闻添加、修改和删除功能。该系统用户分为普通游客和注册用户。普通游客可以方便地浏览新闻,注册用户可以方便、快捷地发布和管理新闻。新闻发布及后台管理页面包含身份验证的内容,未登陆的用户无法访问。在系统中设计了一个通用类,方便后台页面对数据库所作的各种操作,比如读取、写入或更新数据库。在各个页面的上方都添加了其它页面的链接,以便于在不同页面之间快速切换。在首页和新闻列表页面显示新闻列表的地方使用了grIdVIEW控件,以便于格式化地显示新闻信息。This system has realized dynamic management of the news, including foreground view and background management parts, having general function as an news administrative system.Foreground part includes a user login, check and publish news features, the background management includes the news editing and news deleting functions.Registered users can quickly publish and manage news, and guests could read news easily.News issuing and background management pages contain authentication, logged-off users can not access these pages.I have written a foundation class and it's useful when manipulating database, for instance, reading, writing or updating database.There is hyperlinks directing to other pages on each page, and it will be convenient to switch between different pages.GridView Control is added to home page and news list page, news will be orderly displayed in the GridView

Based on UML Embedded System Software Model ATM

为了解嵌入式系统软件技术发展的建模问题,利用uMl构建嵌入式系统软件模型,采用简洁直观的图形描述系统中对象,使理论建模在整个开发过程实现了标准化,所建模型能够使系统有序、准确地指导后续控制代码的编写,大大缩短了软件开发周期,由此证明,uMl作为一种与编程语言无关的通用建模语言,可应用于多种类型的嵌入式系统软件开发,该文将重点讨论如何在嵌人式系统设计中使用uMl技术,并用ATM系统作为实例来具体演示采用uMl的嵌人式系统设计过程。To understand the development of embedded system software technology modeling problem,use UML construct embedded sys tem software model,a simple visual graphics describe system object,make theoretical modeling in the whole development process realized the standardization,the model can make the system and orderly,accurate to guide the follow-up control code compiling,greatly reducing the software development cycle,demonstrating,UML as a programming language has nothing to do with the general modeling language,can be applied to various types of embedded system software development,this paper will focus on how to design of embedded type system people use UML technology,and ATM system as an example to demonstrate the UML into specific people type system design process

新型稠环电子受体的界面修饰对钙钛矿太阳能电池性能的影响

钙钛矿太阳能电池(perovskite solar cells, PSCs)因具有能量转换效率(power conversion efficiency, PCE)高、成本低、易于大面积制造等优点而被科学家们广泛关注.氧化物电子传输层的合理界面设计及修饰对提高器件的PCE和工作长期稳定性有着十分重要的意义.因此,本文采用一种含有烷基噻吩基侧链的稠环电子受体材料3,9-二(2-亚甲基-(3-(1,1-二氰甲烯基)-茚酮))-5,5,11,11-四(5-己基噻吩)-二噻吩并[2,3-d:2′,3′-d′]-s-引达省[1,2-b:5,6-b′]二噻吩(3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(5-hexylthienyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene, ITIC-Th)修饰TiO2电子传输层,制备高效稳定的平面结PSCs.研究结果显示,ITIC-Th的界面修饰改善了TiO2薄膜的形貌、接触角等性质,促进了钙钛矿晶粒的高质量生长,大幅度减少了器件表界面的电荷复合,明显提升了光生载流子的抽取率和输运效率,使经ITIC-Th界面修饰的PSC的PCE从未经界面修饰的15.43%显著提高到18.91%.与此同时,器件稳定性的研究结果显示,在室温和湿度为30%的条件下,经ITICTh界面修饰的PSC的PCE在放置约1000 h后依然保持原来的90%,明显高于未经界面修饰的PSC.研究结果对PSC光伏性能的提升具有重要的实际应用价值和学术意义.国家自然科学基金(61605164);;\n陕西省重点科技创新团队计划(2016KCT-28);;\n陕西省重点研发计划(2017ZDXM-GY-046);;\n福建省科技厅高校产学合作项目(2016H6023)资

The Design and Implementation of Elevator Control System Debugging Software

随着现代化城市的高速发展，电梯的需求量越来越大，人们对电梯控制系统的可靠性以及故障的发现与解决都提出了更高的要求。如何保证每台电梯都能够可靠运行，已成为提高物业管理水平和电梯技术进步的关键所在。电梯运行质量直接由监控系统的功能决定，而系统软件又直接决定着监控系统运行的好坏。目前的电梯监控系统均由电梯生产厂家设计和提供，未来的发展趋势是开发出功能更完善、通用性更强、性价比更高的监控系统。 本文在分析了传统的控制技术的基础上，提出了基于C/S结构和RS232通讯的电梯控制系统调试平台，通过对电梯控制系统参数进行分析，实现对电梯控制系统的监测与参数的设置，并且对电梯故障进行实时监测与记录。本文给出...The market demand of elevators keeps increase as modern cities develop rapidly. And customers require the elevator control system to be of higher reliability and the malfunction to be easier to be detected and addressed. How guarantee that each set elevators can run reliably have become the key that raise estate management level and our country's progressive of the elevator technique. The function...学位：工学硕士院系专业：信息科学与技术学院自动化系_检测技术与自动化装置学号：2322009115286

Design and Implementation of Visualized ETL System in OnceDI

随着网络技术的快速发展、企业信息化的不断深入，企业中分布的数据、信息和知识更加多样，更加复杂，企业信息系统更加开放。如何实现企业中这些数据、信息和知识集成和共享已成为关键性问题。数据集成技术正是针对这种需求，实现分布、异构、复杂数据、信息和知识的动态、灵活、实时的集成和共享。 OnceDI 2.0很好的解决了在数据级别上异构数据源的互操作问题，满足不同的数据集成需求，跨平台，跨多种数据源，具有增量传输，冲突解决等多种实用机制，并提供完善的安全和管理工具。然而，它也存在缺陷，包括：接收数据源只能根据接收到的数据块定义，这时已经完成了数据的发送过程；发送数据源和接收数据源的字段对应关系必须完全由人工构建等问题。 数据集成的目标是为用户访问多个分布的、独立的、异构的数据源提供统一的应用界面。在ETL（Extract-Transform-Load，即数据抽取、转换和加载）过程可视化配置中，包含如何让用户更好地理解ETL过程以及如何让用户更有效地、更容易地配置、管理和执行ETL过程等问题。 论文在研究数据集成过程特点基础上，围绕数据集成中的可视化ETL过程的问题，确立了本文关于数据集成中数据转换和数据过滤的研究方向。针对数据转换，论文从模式匹配和实例转换两方面入手。在模式匹配方面，论文提出一种本体辅助的自动化模式匹配算法，它包括三部分：决策树学习和WordNet词汇本体相结合的方法计算属性名称匹配，定义属性数据类型本体解决带数据类型的属性匹配以及利用领域本体构建属性间的非直接映射关系解决一对多的语义匹配。该方法使得数据转换的可视化过程操作更加简便，自动化匹配结果更令用户满意。在实例转换方面，论文提出一种实例转换工具的设计方案，界面更加友好，更重要地，使得用户对实例级别的转换操作更加清晰、简单。针对数据过滤，论文从数据质量控制条件设置的特点入手，提出一种数据质量控制条件设置工具设计方案。 最后，本文针对OnceDI 3.0中的数据集成模型和OnceDI 3.0客户端-控制中心-DI服务器的三层体系结构设计实现数据集成中的可视化ETL工具，在设计中通过设计模式的应用增强了系统的可扩展性。With the rapid development of the network technologies and the enterprise information technologies, the data, information and knowledge distributed in enterprises are being more diversity and complication. Meanwhile, the enterprise information systems become more open. There is a problem that the distributed, heterogeneous and sophisticated data, information and knowledge within enterprises need to be integrated and shared. Data integration technology is just the one that can realize the dynamic, flexible and real-time integration and share such kind of data, information and knowledge. OnceDI 2.0 has solved many problems well, such as mutual operation of heterogeneous data sources based on data, meeting many kinds of requirements, supporting different platforms, supporting different data sources, incremental delivery, dealing with many kinds of conflicts, and offering perfect tools for security and management. However, it does exist some flaws. The system limits the definition of receiving data source to the definition of the receiving data block, which data sending process has obviously done. The column matching between the sending data source and the receiving data source can be done only by totally manual way. So on so forth. The goal of data integration is that it can provide unified application interface for the user accessing distributed, heterogeneous and sophisticated data sources. In the visualized ETL process, there are problems such as how to make users understand ETL process well, how to make users configure, manage and execute the ETL process more efficiently and easily. After researching the characteristics of data integration, focusing on the issues during the ETL process of data integration, the thesis establishes the research direction towards the data transformation and data filtering in data integration. In each research direction above, the thesis proposes a combined strategy of schema match and instance transformation. On the schema match hand, the thesis proposes a schema match algorithm, which makes the data transformation in the ETL process more easily and friendly. On the instance transformation hand, the thesis gives out a solution, which makes the instance-based transformation more clearly and easily. Furthermore, the thesis proposes two kinds of tools to resolve the data filtering problem. Concerning the implementation, based on the data integration models above and the 3-tier architecture of OnceDI 3.0, the thesis gives out the design and the implementation of the visualized ETL tool in OnceDI 3.0. A series of design patterns are applied in the design to enhance the extensibility of the system

情报产品可视化展示模式和方法研究

[目的/意义] 大数据和社交网络环境下，开展情报产品可视化展示模式和方法的研究，有利于为情报产品可视化的便利性、易读性、生动性和可传播性设计提供思路和方法参考。[方法/过程] 通过对国内外情报产品的可视化问题类型分析以及可视化工具调研，采用描述性研究方法，[结果/结论]对情报产品可视化的信息表达思路、信息传递模式进行了梳理和提炼；对不同分析场景的可视化展示模式、可视化工具选择提出建议，为情报领域信息分析人员提供思路、方法和工具参考。</p

The Exploration of Directed Forgetting in Recognition Tests by Word Frequency and the Old/New Effect

本文采用字表方式,从高低词频和新旧效应角度,探讨内隐和外显测验中定向遗忘效应的存在性及其机制问题.结果发现:(1)低频词在两种测验中都存在定向遗忘效应,而高频词仅存在于外显测验中.(2)两种测验中都存在指示记住的新旧效应,而外显测验中不存在指示忘记的新旧效应.由此推断,测验间在没有&quot;意识和无意识&quot;相互污染的理想情况下,只有外显测验可获得定向遗忘效应;定向遗忘的机制可能是选择性编码机制.</p

可自主潜浮的虚拟锚系通信浮标

本实用新型涉及通信浮标，具体地说是一种可自主潜浮的虚拟锚系通信浮标，适用于海上长时观测作业及通讯中继作业，包括水面浮体、铠装系缆及水下游体，铠装系缆用于动力输送和信息传递，水下游体用于转化波浪能为驱动力，水面浮体与水下游体通过铠装系缆相连。本实用新型采用太阳能充电维持控制系统续航，采用水下游体转化波浪能推进方式实现有动力航行，具备水面气象观测、波浪观测、远距离航行、自守位、深海通讯中继、自主潜浮避险等功能。本实用新型采用环境能源保持生命力和运动能力，具备长时续航能力，可为海洋观测及水面水下联合作业提供有效的技术参考

ontology-aided automatic schema matching

在基于映射的数据交换系统框架下,提出了一种本体辅助的模式匹配方法.它利用WordNet词汇本体和决策树学习相结合的方法进行属性名称匹配,构建数据类型本体计算属性数据类型的语义距离,依赖领域本体发现一对多的语义匹配关系,这3个过程逐步提高了匹配质量.建立在实际应用数据上的实验结果表明,该方法具有较高的精确度和召回率