航天器电测数据库表结构的设计与实现

根据航天器电测数据的特点,提出利用标准数据库管理系统存储电测数据的方法,并设计出一种通用的数据库表结构。该方法已经成功应用于多种航天器型号的电测,可作为航天器电测数据库表结构设计的参考。

基于C#的数据库表结构报表系统的设计与实现

为便于团队交流与系统维护,在对表的设计结构修改后,应及时更新项目技术文档。为克服现有方法存在的不足,在Visual Studio 2010环境下,基于C#编程语言,开发了一个针对SQL Server数据库表结构的报表生成系统。该系统支持单表导出和批量导出两种工作模式,支持将表结构导出到Word和Excel两种应用接口,具有操作简单、使用灵活和功能完善的优点,对提高团队开发效率和技术文档的规范性具有一定的应用价值。

基于PHP开发技术的网站管理系统的设计

随着信息技术的快速发展,网站管理系统已成为企业和个人展示信息、提供服务的重要平台。探讨了基于PHP开发技术的网站管理系统的设计,介绍了网站管理系统的基本功能和需求,阐述了基于PHP技术的架构分析,设计了网站管理系统数据库,结合PHP编程语言进行系统开发,为网站管理系统设计提供理论支持,为相关领域的开发提供实践参考。

格式变化数据的表设计与实现

本文通过合理设计表的结构以及灵活使用GridView控件,很好地解决了要求表结构能够灵活适应不同录入格式的要求。

Oracle数据库统计应用的结构设计与维护技巧

针对大型数据库应用系统在使用过程中保留的海量应用数据,文章基于Oracle数据库,采用"分解范式"的方法设计统计表中包含了用户隶属关系的冗长数据,避免了历史信息存储与隶属关系实时变更产生的数据不一致问题,同时也阻止了非法用户、非法数据对数据库的破坏,进而使这些应用数据除了为应用系统服务之外,变成一种更为有用的新资源,提高了关系型数据库的效率。

MySQL的数据类型和建库策略

无论是在小得可怜的免费数据库空间或是大型电子商务网站，合理的设计表结构＼充分利用空间是十分必要的．这就要求我们对数据库系统的常用数据类型有充分的认识．下面我就将我的一点心得写出来跟大家分享．

The analytical solutions for orthotropic cantilever beams (Ⅰ):Subjected to surface forces

This paper first gives the general solution of two-dimensional orthotropic media expressed with two harmonic displacement functions by using the governing equations. Then, based on the general solution in the case of distinct eigenvalues, a series of beam problems, including the problem of cantilever beam under uniform loads, cantilever beam with axial load and bending moment at the free end, cantilever beam under the first, second, third and fourth power ofx tangential loads, is solved by the superposition principle and the trial-and-error methods.

An automatic grid generation approach over free-form surface for architectural design

An essential step for the realization of free-form surface structures is to create an efficient structural gird that satisfies not only the architectural aesthetics,but also the structural performance.Employing the main stress trajectories as the representation of force flows on a free-form surface,an automatic grid generation approach is proposed for the architectural design.The algorithm automatically plots the main stress trajectories on a 3D free-form surface,and adopts a modified advancing front meshing technique to generate the structural grid.Based on the proposed algorithm,an automatic grid generator named "St-Surmesh" is developed for the practical architectural design of free-form surface structure.The surface geometry of one of the Sun Valleys in Expo Axis for the Expo Shanghai 2010 is selected as a numerical example for validating the proposed approach.Comparative studies are performed to demonstrate how different structural grids affect the design of a free-form surface structure.

一种动态编程技术在MIS系统中的应用

在数据库管理系统应用过程中,如何适应用户多变的需求,有效避免因需求不断变化而出现数据库表结构需要调整的难题,从而导致频繁升级系统的现象。针对这类问题,文章提出了一种动态编程思路,详细阐述了其在数据库管理系统中应用实现过程,并介绍其在主要用能产品和设备能效信息数据库管理系统中的应用。

寿险核心业务系统保单版本的数据存储模型

本文主要就保险核心业务系统保单的数据库存储问题作一些分析,提出了一个比较合理的数据库存储结构来满足千万保单包括其历史数据的存储以及历史数据的查询。

Assessment of the Seismic Behavior of the Reinforced Concrete Structures Based on the Probabilities

This paper presents an analytical foundation for probability-based formats for seismic design and assessment of structures. These formats are designed to be suitable for code and guideline implementation. The framework rests on non-linear, static seismic analysis. The formats can be used to ensure that the structural seismic design can be expected to satisfy specified probabilistic performance objectives, and perhaps （more novel） that it does so with a desired, guaranteed degree of confidence. Performance objectives are presumed to be expressed as the annual probability of exceeding a structural performance level. Structural performance levels are in turn defined as specified structural parameters （e.g., ductility, strength, maximum drift ratio, etc.） reaching a structural limit state （e.g. onset of yield, collapse, etc.）. The degree of confidence in meeting the specified performance objective may be quantified through the upper confidence bound on the （uncertain） probability. In order to make such statements, aleatory （random） uncertainty and epistemic （knowledge limited） uncertainty must be distinguished. The single seismic design foundation can be formatted into the alternative conventional design methods such as LRFD design and fragility-hazard design. Versions of the new developments reported here are already in place in recently completed seismic guidelines.

In-situ electrochemical activation designed hybrid electrocatalysts for water electrolysis

Developing transition metal-based electrocatalysts with rich active sites for water electrolysis plays important roles in renewable energy fields. So far, some strategies including designing nanostructures, incorporating conductive support or foreign elements have been adopted to develop efficient electrocat- alysts. Herein, we summarize recent progresses and propose in-situ electrochemical activation as a new pretreating technique for enhanced catalytic performances. The activation techniques mainly comprise facile electrochemical processes such as anodic oxidation, cathodic reduction, etching, lithium-assisted tuning and counter electrode electro-dissolution. During these electrochemicaI treatments, the catalyst surfaces are modified from bulk phase, which can tune local electronic structures, create more active spe- cies. enlarge surface area and thus improve the catalytic performances. Meanwhile, this technique can couple the atomic, electronic structures with electrocatalysis mechanisms for water splitting. Compared to traditional chemical treatment, the in-situ electrochemical activation techniques have superior advantages such as facile operation, mild environment, variable control, high efficiency and flex- ibility. This review may provide guidance for improving water electrolysis efficiencies and hold promis- ing for application in many other energy-conversion fields such as supercapacitors, fuel cells and batteries.