PLC在自动磨口机上的应用

本文介绍韩国金星ＭＡＳＴＥＲ－Ｋ系列可编程控制器在自动磨口机上的应用、系统组成与程序设计。该机稳定可靠、功能强、维修简便，实现了化纤高速纺筒管端面磨口的自动加工。     

管线钢X65热轧变形抗力数学模型

利用热加工模拟试验机进行高温单道次、多道次压缩试验，测定了管线钢Ｘ６５在不同条件下的变形抗力。在此基础上，建立了Ｘ６５钢的高温变形抗力模型和残余应变率模型，并对残余应变现象及其影响因素和算法进行了探讨。     

异步时序逻辑电路的最小时钟覆盖设计法

通过引入动态，静态迁移符号，提出了设计异步时序逻辑电路的新方法──最小时钟覆盖法，并举例说明了其应用．     

两相闭式热虹吸管的集总参数模型研究

通过分析无芯网的两相闭式热虹吸管（简称为ＴＰＣＴ）的传热机理，提出了正常工况下ＴＰＣＴ的集总参数模型，并利用现有的热管内部传热的经验关系式，对ＴＰＣＴ在不同热负荷、不同冷却速率以及不同工质种类条件下的温度分布和动态响应特性进行了数值模拟计算．结果表明该模型简明可行     

灰色关联分析法综合评价不同品种加工番茄的品质

利用灰色系统理论中关联分析方法，对8个酱用番茄栽培品种进行综合评估，结果表明：在供试的8个品种中，与理想品种性状的关联度次序依次为：红霸〉红运〉石红9号〉新番7号〉石红4号〉新番8号〉里格尔〉UC-82。即红霸、红运综合表现最好，UC-82表现最差。此评价结果与各品种实际表现基本一致。灰色关联分析法对综合分析加工番茄新品种较合理，对加工番茄选育与推广有积极的指导意义。     

微波辐射下甲醛交联壳聚糖香草醛希夫碱的制备及吸附性能

利用微波辐射法合成了甲醛交联壳聚糖香草醛希夫碱,用IR和XRD对其结构进行了表征,并用UV吸收光谱比较了甲醛交联前后壳聚糖香草醛希夫碱在酸中的溶解性能.吸附实验表明,该壳聚糖改性产物对一些金属离子的吸附性能与壳聚糖香草醛希夫碱和甲醛交联的壳聚糖有所不同,对Cu2 具有良好的吸附选择性,并且在酸性环境中几乎不溶解,因此可用作Cu2 的选择性吸附剂.     

基于WebGIS的城市旅游信息系统的设计与实现

通过一个基于WebGIS技术的城市旅游信息系统的设计与实现,对平台化、组件化的WebGIS项目开发过程进行了研究与探讨.介绍了城市旅游信息系统的需求分析和设计,.NET构架下基于GIS应用服务器扩展的全组件化的GIS开发方式,以及基于HTML和JavaScript的WebGIS瘦客户端的实现.     

基于MapObjects2.3开发南宁邕江水域信息管理系统

使用地理信息系统(GIS)控件MapObjects2.3,Visual Basic6.0和其它编程工具开发南宁邕江水域信息管理系统.系统能够实现南宁邕江水域信息的集中、高效管理,以及流域水质的预测,能为及时制定南宁邕江水域的水污染预防和控制策略提供重要依据.     

Growth ages of ferromanganese crusts from the western and central Pacific： Comparison between nannofossil analysis and ^10Be dating

Based on results of nannofossil analysis and 10Be dating in ferromanganese crusts M1-1 and A1-1 (no nannofossils were found in it),from the western and central Pacific respectively,it is found that the crust growth ages from nannofossil biostrati-graphy agree well with those based on 10Be isotope analysis. Both crusts have three growth layers,and the oldest layer was deposited in Miocene at about 12.80 Ma. The maximum,minimum,and average growth rates of crust A1-1 (from the central Pacific) are 8.11,1.92 and 3.47 mm/Ma,and those of crust M1-1 (from the western Pacific) are 2.93,0.47,and 0.94 mm/Ma.     

Climate change and hydrologic process response in the Tarim River Basin over the past 50 years

Climate change and hydrologic process response in the Tarim River Basin over the past 50 years are the focus of more and more researchers＇ attention. In this paper, both temperature and precipitation time series were found to present a monotonic increasing trend using nonparametric tests. Noticeably, a significant step change in both temperature and precipitation time series occurred in 1986. By contrasting the trends of natural water process in headstream and mainstream, we found that it was anthropogenic activities not climate change that caused the river dried up and vegetation degenerated in the lower reaches of Tarim River. The results of gray correlation analysis show that the runoff of higher latitude distributing river is more closely associated with winter snow stocking, while that of lower latitude is more closely related to summer temperature. Runoff in the headstream is more sensitive to precipitation, while that in the mainstream is more sensitive to evaporation. The strong evaporation caused by increasing temperature weakened runoff to some extent in spite of the fact that precipitation increased over the past 50 years.