基于Petri网运算的系统范例分析

文献［１］中首次提出了Ｐ／Ｔ网的加法运算与笛卡尔积运算的概念，并对这两种运算的代数性质进行了研究。本文基于文献［１］的结果，对柔性制造系统、资源共享系统、控制系统中若干范例进行分析，从而显示了Ｐｅｔｒｉ网运算的背景及其意义。     

美义场和中国传统审美

以字源义的分析为切人口，揭示了美义场中某些有代表意义的字所反映的中国传统审美观念：秀、娇、峨表现出对自然、淳真的肯定；美、嘉、嫣、好和丰、妙、倩从两个方面表现出人类对于旺盛生命的赞美；善、淑、修、佳，臧、令和婉分别从三个角度表现了特定宗法制度下人们的审美观点。     

英语词汇中的性别歧视现象

性别歧视现象是学术界关注已久的话题，有关研究正在向纵深发展。大量的例证说明英语词汇中存在性别歧视的问题，分析这一问题产生的原因和探讨纠正性别歧视的方法对跨文化交流和语言翻译有着重要作用。     

基于Asp.net技术的动态统计图处理编程

在.Net Framework环境下，分析动态统计图在Asp．net技术中的编程与实现，及其在实际工作中的应用价值与前景．     

混合条件/事件Petri网在飞控系统建模中的应用

提出一种混合条件/事件Petri网,以方程和图形两种形式定义了其受控演变规则,该网能够很好地描述一类离散事件和连续演变过程的混合交互现象,并应用于自修复飞行控制过程的建模中,使其离散跳变、连续演变过程以及相互间的交互得到较好的描述与处理,并能将演变结果显化在图形上。     

Ecosystem valuation and the conservation of wild lands in vigorous economic regions:A case study in Jiuduansha Wetland,Shanghai

As the loss of wild lands to satisfy traditional economic development has become a global environmental problem in recent decades, using ecosystem valuation to estimate the total economic value (TEV) of an ecosystem has become popular. The main purpose of the ecosystem valuation is to strengthen the importance of ecosystems, and bring the ecosystem services into the traditional cost-benefit analyses of land use strategy. Some studies have illustrated that in remote areas, wilderness can produce more value if it is conserved, rather than converted to traditional agricultural or industrial uses. The same situation does not seem to exist in vigorous economic regions. Thus, a case study was conducted on the Jiuduansha Wetland in Shanghai using three approaches: the direct market valuation, the replacement valuation and the contingent valuation. The net present TEVs of three land use scenarios over one hundred years were evaluated. The results proved that simply based on ecosystem valuation, when compared with the other two scenarios of "conservation" and "selective use", "partial conversion into terrene (dry land)" of Jiuduansha might be the optimal scenario for the well-being of the people in Shanghai. Land price was identified as the most important factor. This situation is likely due to the scarcity of land available for traditional economic development in Shanghai. Thus, we speculated that the fate of the wilderness to "be destroyed" in vigorous economic regions could not be changed simply based on ecosystem valuation. However, the variety of interest by local residents in wilderness might enhance the TEVs of scenarios such as "conservation" and "selective use", and affect the valuation results. Since some important benefits of natural ecosystems remain unknown and others are underestimated, we suggested that any land use decisions regarding the Jiuduansha Wetland should be conservative and cautious as converting wetlands into terrene is an irreversible process.     

基于Petri网的战役机动铁路输送仿真

提出了战役机动铁路输送的Petri网模型，运用该模型建立了分布式仿真系统，模拟了战役机动索件下的大觌爿芙郎队铁路输送，实现了铁路中断、车站破坏等战场情况下的列车仿真运行。通过对仿真结果的分析，得出战役输送的总体评价，为作战运输指挥提供一定的依据。     

关于大型网架采用手动葫芦吊装的技术探讨

通过介绍吉林某焦化厂精煤棚（平棚）网架的吊装方案，提出了新的吊装法——手动葫芦的吊装法，分析了一些推广经验和大型网架吊装中的注意问题。     

HFC网—实现多媒体通信的新途径

混合光纤／同轴电缆网是一种刚刚兴起的通信体制，它在带宽，兼容性和投资方面明显优于其它网络，代表了一种实现多媒体通信的新途径，讨论了这种网络的网络结构，频谱划分，双向以及网络管理等方面的内容。     

关于微积分学中的极限概念

本文详细分析了数学分析中各种主要类型的极限概念的区别与联系，就有关数学内容的处理提出一点参考意见．