Specification and Shadowing Properties for Non-autonomous Systems

In this paper, various properties of non-autonomous dynamical systems having periodic shadowing property and local weak specification property are studied. The main theorem gives an interrelation among the shadowing property, periodic shadowing property and local weak specification property of an expansive non-autonomous system.

     

Specification Property for Topological Spaces

We introduce and study here the notion of specification property termed as topological specification property for homeomorphisms on non-compact non-metrizable spaces. We prove that if a self homeomorphism on a totally bounded uniform space is mixing, topologically expansive and topologically shadowing then the map has topological specification property.     

A Note on Sensitivity in Uniform Spaces

In this paper, the notions of periodic point are compared, and the sensitivity of semigroup actions on Hausdorff uniform spaces is studied. We show that for an action of a semigroup on a compact uniform space, if it is syndetically transitive and not minimal, then it is syndetically sensitive. We point out that if an action of a semigroup on a uniform space (does not need to be compact) is topologically transitive, not minimal, and has a dense set of s-periodic points, then it is syndetically sensitive. Additionally, we prove that if an action of a monoid on a uniform space (does not need to be compact) is topologically transitive, not minimal, and has a dense set of FM-periodic points, then it is syndetically sensitive.     

Operation Strategy and Matching of Supply and Demand of CCHP System with Various Building Types

The important indications for assessing CCHP(combined cooling,heating and power) systems are their supply-demand matching characteristics between the user demand side and the energy supply side.These characteristics are primarily influenced by different building types and operating strategies.In view of the energy redundancy of the following electric load(FEL) and following thermal load(FTL) operation strategies and the energy deficiency of the following hybrid electric-heating load(FHL) operation strategy,this paper proposes an improved following balanced heat-electrical load(IFBL) operation strategy based on the following balanced heat-electrical load(FBL) operation strategy.Based on the energy utilization rate as the objective function,this paper optimizes the installed capacity of CCHP systems in different buildings and proposes an energy factor for evaluating the supply-demand matching characteristics of the system.The results show that the energy utilization rate and energy factor of the system under IFBL are optimal relative to the other operation strategies.Secondly,the hotel building has the highest energy utilization rate and the lowest energy factor;on the contrary,the office building has the lowest energy utilization rate and the highest energy factor.Finally,the analysis of supply-demand matching for different building types under multiple operating strategies shows that the hospital and hotel systems exhibit optimal supply-demand matching performance under the IFBL strategy,with values of0.945 and 0.938,respectively;on the contrary,the office system has an optimal supply-demand matching of 0.935under the FEL strategy.Under the FTL strategy,the systems of all three buildings exhibit poor matching performance.     

多种锅炉共用燃料制备系统的优化

阐述了不同类型锅炉共用燃料制备系统进行优化的措施 ;开发研制可调复合筛系列 ,改进环锤破碎机的结构 ,将为循环流化床 (CFB)锅炉的更广泛应用起到很大的促进作用     

协调统一锅炉安全技术规范及标准的探讨

论述了我国锅炉安全技术规范与标准的现状，研究了国际上锅炉安全技术规范和标准的发展趋势，提出了协调统一我国锅炉安全技术规范和标准的建议。     

An Example of a Vector Field with the Oriented Shadowing Property

Journal of Dynamical and Control Systems - We consider shadowing properties for vector fields corresponding to different type of reparametrizations. We give an example of a vector field which has...     

电站锅炉用原材料采购技术文件及质量控制探讨

本文结合工作经验及质量体系的要求 ,围绕采购技术文件编制的意义、要点及原材料采购质量的控制手段和方法等方面 ,对如何保证电站锅炉用原材料的采购质量进行了探讨     

直齿圆锥齿轮的加工工艺规程

加工直齿圆锥齿轮工作中，对刨齿机的调整和圆锥齿轮的计算。在机械零件加工中，经常遇到圆锥齿轮的加工，在小批量生产及单件生产中，需要在专用刨齿机上进行。圆锥齿轮的加工，对于机床的调整和各步骤的计算比较复杂和繁琐，因此本文针对圆锥齿轮的加工，阐述了机床的调整和锥齿轮的计算，并简述了加工工艺规程。     

Uniform Cooling of Alloys

A phase separation process model formed by the Cahn– Hilliard equation and the heat equation is considered. The mobility coefficient in the Cahn–Hilliard equation is assumed to be an increasing function of the temperature. This property is of importance at the latest stage of the cooling process. The existence and uniqueness of a weak solution is proved, and a uniform cooling problem is studied. Obtained results can be used to control the cooling process and to create alloys with a uniform structure. 2000 Mathematics Subject Classification. 35K30, 35Q99, 49J20.     

几种供热热源的特点与能耗分析

介绍了热电联产、区域锅炉房、分散燃气锅炉房、单户式燃气炉和地下水源热泵等主要供热热源的特点,对比分析了各种热源形式供热系统的一次能源消耗量,并提出了供暖热源选择的优先顺序,为不同现状下新旧建筑的供热方式提供建议。     

Uniform Stability and Stabilization of Linear Thermoelastic Systems

The object of this work is the study of uniform stability and stabilization of linear thermoelastic systems. We construct an explicit stabilizer feedback for the thermoelastic system and use a Lyapunov function to prove the exponential stability.     

反应器形式对异丙苯氧化的影响

在100℃、0.5MPa下,以Na2CO3溶液为稳定剂的异丙苯液相空气氧化反应过程中,当反应时间相同时,在环流反应器内的过氧化氢异丙苯(CHP)浓度和异丙苯氧化速率均高于鼓泡反应器。在常压、85℃的UOP工艺条件下,经过诱导期后,高/径比相对较小的鼓泡槽反应器不用稳定剂比环流反应器和鼓泡塔反应器对异丙苯的氧化反应更为有利。     

基于均匀设计的可生物降解内燃机润滑油研究

以菜籽油、轻脱油和季戊四醇为内燃机基础油,选择T201、1202为抗磨剂,T301为极压添加剂,采用均匀试验方法设计试验方案,并测定在不同添加剂含量下的最大无卡咬负荷(PB)和磨斑直径(WSD),利用逐步回归法分析了基础油和添加剂之间的配伍性和相互作用的摩擦机理.结果表明:1202可以提高PB值,但T202将使WSD值增大,而T201与1301的协同作用对提高PB值和WSD值效果较好.     

深厚表土段井壁径向荷载的规范计算方法探讨

针对我国立井井筒设计规范建议的径向荷载计算方法的准确性与适用性问题,基于多个立井工程的地质资料及参数,根据规范方法计算得到其径向荷载的理论分布特征,并与实测数据进行了比较。结果表明,规范建议公式的计算结果与实测值存在一定的误差,尤其是计算岩层中的井壁径向荷载误差较大,且立井深度越大,基于规范算法得到的井壁径向荷载误差越大。由此建议深入开展深土力学研究,基于更多的测试与研究来确定深厚表土中井壁径向荷载的大小与分布规律。     

喷流式退火炉炉内卷材尺寸对换热过程的影响

利用FLUENT软件对铝卷材喷流退火过程进行模拟计算,模型耦合求解炉内温度场及流场。讨论退火过程卷材规格不同对卷材截面换热的影响,得到卷重及宽度不同时料卷芯部与端部温升的变化规律。     

上海市工程建设规范《分布式供能系统工程技术规程》（试行）

为促进上海市实现能源的综合利用，优化能源供应结构，推进循环经济和资源节约型城市的建设，根据上海市发展和改革委员会沪发改能源[2004]019号《关于印发燃气空调和分布式供能系统协调推进工作会议会议纪要的通知》、上海市建设和管理委员会沪建建[2005154号文的精神，在上海市科学技术委员会支持下，上海市电力公司会同有关单位组成了规程编制组。编制组得到了市市政局、市消防局、市质监局、市安监局、市规划局、市环保局的大力帮助，在参考国外的一些资料，广泛征求意见的基础上，制定了本规程。     

扭转减振器类型检测的试验研究

详细论述某型号发动机扭转减振器类型检测的试验研究过程，在扭转减振器分解前摸清厂减振器的基本结构类型，为下一步工作奠定了基础，并摸索了一条扭转减振器类型检测的新方法。