化工生产过程计算机仿真控制系统

针对大型化工生产过程控制的仿真对各类操作人员的培训问题,以自主开发设计的甲醇和碳酸二甲酯生产过程仿真控制系统为背景,阐述了化工生产过程计算机仿真控制系统的建模技术及模型求解方法,并给出了基于PID的调节器参数整定方法以及主要控制过程的PID控制仿真实例,该系统不仅适用于化工企业员工的上岗培训,而且适用于化工专业学生的生产实习.     

合成氨工艺认识实习的CAI系统

计算机辅助教学是多媒体技术的一个重要分支，它是将文字，声音、动像、动画等多种媒体集成到计算机中，帮助教师进行教学的一种方式，该文描述ＣＡＩ在化工原理课程认识实习中的应用，介绍了合成氨工艺仿真系统的设计原理、特点及应用。系统系统不仅可用于教学。使学生对化工过程有一个形象直观的认识，而且可以使学生通过计算机模拟化工生产过程的操作，使其有一个身临其境的感觉。该系统也适合培训工厂企业的操作技工。     

化工生产中DCS自动控制的应用研究

DCS系统是主要通过网络、电脑、监控、通讯以及自动化控制等各种技术手段来控制生产的过程,到目前为止,这一种技术已引入到化工生产之中,并日益普及,为节约资源以及安全生产创造了条件。通过该项技术在化工生产的具体应用,阐明该项技术使用当中重点把握的事项,希望能够为化工生产充分发挥该项技术的作用提供参考依据。     

高温废水闪蒸节能与回收物料技术的研究与应用

对精馏塔塔釜排放的高温废水，采用欲称“大气腿”技术回收其中的能量与有机物料。即使用蒸汽喷射泵形成真空，使部分高温废水和物料闪蒸汽化，进入生产系统回收利用。该技术同时适用于各种化工过程排放的高温废水等低阶能源的回收与节能。     

对苯二甲酸工艺全流程仿真系统

介绍了年产７．５万吨对苯二甲酸工艺全流程仿真培训系统．该系统采用微机网络结构模拟了化工过程动态特性和仿ＴＤＣ３０００集散控制系统，并拥有工艺现场模拟站以及教师指令台，可实现对工艺操作员、仪表技术员和组态工程师的培训     

实物性和虚拟性相结合的变电站培训仿真系统

提出的基本网络的实物性和虚拟性相结合的变电站培训仿真系统，综合运用了网络技术，专家系统技术，控件技术和DirectX技术，具有丰富的仿真功能，在变电站培训仿真系统的个体培训模式和师生培训模式的基础上，提出并实现了协作培训模式，该培训仿真系统为快速培养合格的变电运行人员提供了强有力的工具。     

桌面ECDIS培训系统

介绍了基于计算机网络技术的桌面ECDIS（电子海图显示与信息系统）培训系统，解决了船舶驾驶人员的ECDIS操作培训及CAI教学。该系统按照国际海图显示标准与电海图数据传输标准，以面向对象的Visual C 为开发工具，实现海图信息显示、航海推算与定位等功能。采用多变量函数法由离散分布的实测水深获得船舶所在位置的水深，实现了测深仪仿真，系统模拟实际的ECDIS的操作界面，使教学更加真实和简捷，学员在短时间内就能快速地熟悉和掌握ECDIS的原理和操作。系统的实时交互性使教可随时杳看任一指定9学员的当前操作情况，指导和培训赏进行各种海图作业操作。     

流量检测控制系统

目前国内采用的流量计量方法主要有玻璃管量油孔板测气、翻斗量油孔板测气、两相分离密度法和三相分离计量方法等。随着技术的进步，石化生产越来越需要功能强、自动化程度高的计量设备以提高劳动生产率和企业的管理水平。除此以外，生产中有时需要添加各种助剂（如聚合反应），由此引出了这个恒流量的控制系统。综上所述．无论是在化工生产过程中注入各种助剂．还是在成品的计量及运输过程中，对于流量都要求一定的精确计量和控制。     

基于宽带应用的视频点播系统的设计与实现

介绍了基于ASP技术的网络视频点播系统的设计与开发过程，该系统采用Browse／Server模式，服务器端利用ADO组件访问数据库，后台数据库采用Acoess。用户可以通过注册使用从而了解本站的各项功能，并可以在线收听音乐及观看影片等，实现了用户的网络视频点播功能。     

基于DCOSE的面向对象的图形化建模系统D-CAM设计研究

基于DCOSE仿真支撑环境,设计了一套面向对象的图形化建模系统D-CAM,开发了相应的模块库、资源库,独特的热力系统流体网络算法、电气网络算法、控制逻辑算法,以及系统管理工具软件。该系统具有高度的开放性、完全面向对象的模式、便捷的实例化方法、强大的调试手段、文档的自动生成发布及查询等功能。该图形建模方案可以广泛地应用于电力、石油、化工等行业的仿真培训系统,目前已经成功地应用于50多个电厂的仿真培训系统。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.