Design and Implementation of Audio and Video Electronic Commerce System Based on .NET

随着社会的高速发展，互联网已经成为信息的最佳流通渠道，基于网络的营销电子商务开始迅速发展。电子商务凭借着其高效性、快捷性、方便性的优势，成为了全球信息化和经济全球化的一个重要的领域。本文根据目前国内视听商品类电子商务系统发展不够充分的现状，针对视听领域进行研究，以建立音像舞蹈类电子数码产品版权为重点的视听商品电子商务系统。 首先，本文介绍了系统的选题背景和意义，并对课题的应用与研究现状进行了详细介绍，并阐述了论文的主要研究内容。其次，本文对系统设计与实现的相关关键技术作了详细的介绍，包括B2C电子商务的概念、UML技术以及系统的三层架构MVC技术。接着使用UML统一建模语言对系统完成了需求分...With the rapid development of society, the Internet has become the best information circulation channels, based on the electronic commerce network marketing began rapid development. The electronic commerce with its high efficiency, rapidness, convenience, has become an important field of global informationization and economic globalization. According to the present situation of the development of ...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X201223073

The development of online detecting system of five-axis CNC grinding machine for indexable insert

五轴可转位刀片磨床具有高速、高精的特点,为了使所磨的刀片符合精度要求,需要针对刀片的尺寸开发一种在线检测系统。本文所介绍的在线检测系统主要由两方面构成:一是在磨床数控系统中将测头伸缩时发出的电压信号转换为测量值;二是建立刀片尺寸的加工模型。在线检测系统通过调用系统的测量宏程序,获取刀片测量值,将此测量值输入到加工模型中,得到所加工刀片的指导尺寸。通过实验,得到了刀片的指导尺寸和测量时间,验证了此在线检测系统是可行并且可靠的。The five-axis CNC grinder of indexable insert is characterized by high-speed and high-precision.,in order to meet the accuracy requirements of grinding blades, needed an online detection system developed for the size of the blade.The online detection system described in this article consists of two aspects: First, the voltage signal that when the probe telescopics will be converted to the measured value; Second, establishing the process model of the blade size.The online detection system will get the blade measurements by calling the measure macro, then the measured value input into the process model, obtaining the guidance blade size.Through the experiment, verifying this online detection system is feasible and reliable by the obtained guidance blade size and the measuring time.国家“高档数控机床与基础制造装备”科技重大专项资助(2010ZX04001-162

三峡水库和长江中下游通江湖泊洞庭湖和鄱阳湖草鱼鲢的孵化日期及早期生长特征

三峡水库以及上游江段形成的河库生态系统与长江中下游洞庭湖和鄱阳湖的江湖生态系统都是四大家鱼的重要栖息地,有相似性也有差异. 2017年7 8月在三峡水库、洞庭湖和鄱阳湖利用地笼、虾笼、高网和迷魂阵采集草鱼和鲢幼鱼样本,观测耳石日轮,分析三峡水库和通江湖泊草鱼和鲢幼鱼的繁殖时间和早期生长特征及差异,探讨相应的保护措施.结果显示,三峡水库、洞庭湖和鄱阳湖采集草鱼幼鱼的孵化日期分别为4月24日5月25日、5月21日6月26日和5月4日5月28日;鲢幼鱼的孵化日期分别为4月10日6月12日、5月25日6月19日和5月9日6月12日.三峡水库、洞庭湖和鄱阳湖草鱼样本的体长增长率分别为1.04、1.84和1.64 mm/d,微耳石的沉积率分别为3.41、5.41和4.77 &mu;m/d;鲢幼鱼的体长增长率分别为1.10、2.87和1.96 mm/d,微耳石沉积率分别为2.96、7.17和4.57 &mu;m/d.洞庭湖草鱼和鲢的体长增长率和耳石沉积率均显著大于三峡水库;鄱阳湖鲢的体长增长率和耳石沉积率均显著大于三峡水库,而草鱼的体长增长率和耳石沉积率则与三峡水库没有显著差异.结果表明,三峡水库蓄水后长江中游干流草鱼和鲢的繁殖时间明显滞后;洞庭湖和鄱阳湖的草鱼和鲢幼鱼生长更快.目前,长江全面禁渔正在逐步实施,预期将对恢复鱼类资源起到重要的作用.除了全面禁渔之外,还建议保护和修复鱼类栖息地;减少江湖阻隔,灌江纳苗;增殖放流亲鱼;开展生态调度,促进鱼类繁殖.</p

Measurement and research of the electric spindle rotation error

为得到不同转速下主轴的回转精度,采用双向动态测量法测量液体静压轴承电主轴的径向位移误差,借助激光位移传感器记录主轴径向误差数据,利用自主开发的数据处理软件实现测量数据的误差分离,通过最小二乘圆法评定主轴的回转精度,为主轴最优工作转速的选取提供理论依据。The experiment measures the radial displacement error of hydrostatic bearing electric spindle using two-direction dynamic measurement method.With a laser displacement sensor to record the error on radial direction,the research has developed a data processing software to realize the error separation of measured data.The rotation accuracy is determined by the least squares method.The study can provide a reference for the selection of optimal spindle working speed.国家科技重大专项项目(2011ZX04003-021); 陕西理工学院研究生创新基金资助项目(SLGYCX1314

Enhanced strength-ductility synergy in a gradient hetero-structured CrCoNi medium-entropy alloy

A CrCoNi medium-entropy alloy (MEA) with gradient hetero-structure (GHS) composing of gradient nanostructured surface layer and hetero-structured matrix was prepared via a two-step process: pre-cold rolling (CR) deformation and subsequent annealing followed by surface mechanical grinding treatment (SMGT) and secondary annealing. The GHS CrCoNi exhibits an excellent synergy of strength and ductility, as evidenced by a yield strength of approximately 1.2 GPa and a uniform elongation of about 20%. The GHS displays a pronounced hetero-deformation induced (HDI) hardening effect, whereby the central layer (CL) and surface layer (SL) undergo local strain hardening in a mutually compatible manner. This process facilitates the multiplication and accumulation of geometrically necessary dislocations (GNDs) at intra- and inter-layer hetero-interfaces and also activates the deformation faulting and twinning in both CL and SL, thus enhancing the overall mechanical response. The interlayer compatible deformation observed in the GHS significantly bolsters the sustainability of strain hardening at the microscopic scale. This effect is of significant importance in redistributing stress and strain more rationally across the entire GHS sample, effectively reducing the risk of localized deformation failures. This study offers insight into the correlation between macroscopic strain hardening and micromechanical behavior in gradient-/hetero-structured materials

铝合金激光-MIG复合焊中两种焊接方向对焊缝的影响

以高铁用6N01铝合金为试验材料,采用激光-MIG复合焊接方法,进行了焊接工艺试验,对两种不同的焊接方向进行了对比研究。对比分析了不同焊接方向下,焊缝形貌的变化、焊缝硬度和组织的改变;对两种条件下的焊缝进行了拉伸强度测试;经过X射线探伤,讨论了不同的焊接方向对气孔数量和分布的影响。结果表明不同焊接方向下焊缝的成形、熔合区的晶粒生长取向、气孔分布不同,而硬度和拉伸强度差别不大