以牙哈（YH）凝析气藏E+K区块M井组为例，建立典型井组数值模拟模型，对注气提高采收率主控因素及其机理进行了研究。在注采部位、注入介质、注气量、注采比、注气时机及压力恢复程度不同的条件下，模拟生产效果并对井组注气方案进行了优化。结果表明，采用“上注?下采”、循环注气、注气量（30.50～36.60）×10⁴ m³/d（年注气量为原始地质储量的2.50%～3.00%）、维持较高地层压力（衰竭至不低于露点压力）等条件时，凝析油开发效果较好。研究结果可为YH凝析气田注气开发中后期提高采收率技术政策制定提供依据，为凝析气田中后期开发调整提供指导。

In order to determine the basic causes of major accidents which may occur in the reforming unit, and take the countermeasures of safety, this paper used the risk degree assessment method for safety assessment about the reforming unit. Hidden danger of the unit was found by the analysis of risk, and intrinsic risk grades of the equipment units was divided by the risk assessment table. Results show that the unit has very high intrinsic risk grade, in which the existence of a large number of hazardous substances, most equipments because of the high temperature and pressure, corrosion and other factors can easily lead to the leakage of medium, so as to cause fire and explosion. According to the results of the assessment, propose the corresponding safety measures to prevent accidents, ensure the production running smoothly.

在基于浏览器／服务器的应用环境中，上传各种类型的文件并方便地管理一直是困扰用户文件管理应用的难题之一。利用Java I/O流类的输入输出对象开发无组件上传程序，上传文件操作包括提交上传文件请求页面,处理上传文件的页面和管理上传文件的页面，上传文件可直接存储到指定目录，并采用数据库管理上传文件。论述了用Java I/O流技术上传文件的实现原理及用数据库管理的方法，给出了具体的解决方案和实现方法。