快速锻造液压机组的计算机控制

提出了一种快速锻造液压机组计算机控制的分布式系统结构，分析了其基于模糊控制的智能位置控制系统，给出了实现超程补偿的方法，并已成功地应用到生产实践中．     

多轴加工余量模型构建与机床行程约束控制研究

针对快速铣削刀具路径规划中产生的空切削问题,基于刀具包络面临界曲线求解算法,构建了环形铣刀在切削过程中形成的空间扫描体模型,实现加工余量模型的构建。针对加工过程中刀轴选择不当造成的机床超程问题,采用后置处理算法建立了机床行程约束模型,给出了机床超程所需要的判定条件,可为该类型机床超程分析提供参考依据。     

用“物—场”分析原理降低液压机油泵损坏率

在TRIZ"物—场"分析原理的基础上,建立了液压机油泵的"物—场"分析模型。以TRIZ解法为依据,结合工程实践数据研究,形成了降低液压机油泵损坏率的可行性方案并探讨了其适用范围。最后,以创新产品开发为实例,表明该创新方法在实际生产过程中的有效性和先进性。     

形位误差数据采集与数据处理系统

在分析回转类零件采样特点的基础上，给出了圆度、圆柱度、轴线直线度及同轴度等形位误差的数学模型．介绍了微机控制下的形位误差数据采集与数据处理系统的功能、组成及软件设计方法．该系统的研制对丰富三坐标测量机形位误差测量软件具有重要参考价值，并为实现形位误差在线测量打下了基础．该系统已成功地应用于ＸＷＹ－Ⅰ型形位误差测量仪中     

微电机转子片五工位级进模的设计

在冲裁机械零件加工中，五工位级进模是代替单模单件加工的先进模具．本文介绍了微电机转子片的加工采用五工位级进模的设计方法，给出了设计要点以及详细机械图样．该模具已在生产中应用．     

热水锅炉停炉腐蚀与保护

热水锅炉停炉腐蚀是北方采暖锅炉普遍存在的问题，使用正确的停炉保护方法可以延长锅炉的使用寿命，并提高锅炉运行的安全性，从理论上分析了，热水锅炉停炉腐蚀的机理和危害．提出了两种新型的湿保护方法和干保护方法．并详细阐明了这两种方法的原理和具体操作步骤．实验结果表明：这两种方法对热水锅炉停炉腐蚀的预防是有效的．研究成果对锅炉的运行与保护具有一定的指导意义。     

基于KBE和CAE结合的液压机结构柔性模块创建

以广义模块化设计理论为基础，结合液压机身结构的特点，将知识工程和有限元分析应用于液压机柔性模块创建，并以三梁四柱式锻造液压机为例，介绍了一种基于VisualC 语言开发液压机本体设计专家系统的方法，建立了一套基于KBE和CAE技术的液压机机身计算机辅助设计系统。实践证明，将KBE技术和CAE技术集于一体，能够较好地解决液压机的模块化快速响应设计问题。     

复合材料液压机偏载预应力下的模态分析

液压机模态分析是整个液压机结构动态设计的核心.通过对YT71S-2400复合材料液压机的模态分析,得到液压机-模具耦合结构在偏载预应力状态下的固有频率和振型,并对该状态下的前10阶模态进行振动特性分析,得出该耦合结构的有害振型及其位置,为液压机整体设计提供动态特性参考.同时,通过该研究还得出了该液压机-模具耦合模型在偏载预应力状态下的最小频率远大于其工作频率,不会产生共振,但处于次声波范围内,需要注意防护可能产生的噪声污染.     

十六工位气动分度回转工作台及其研制中几个问题的分析

本文提出了一个十六工位气动分度回转工作台的设计方案，并以研制中的主要技术问题为中心，对分度转台的分度超程、分度气缸的速度控制和气缸端部缓冲进行了分析，为多工位气动分度回转工作台的研制提供了系统的解决办法。     

液压机的设计与分析

随着我国制造业的快速发展,大型精密液压机的需求也随之快速增长,这也对生产设备精度、自动化程度和生产效率提出更高的技术要求。本文通过对液压机系统的工作原理、液压机运转的设计思路、液压机的整体控制方案设计三方面进行分析,阐述了液压控制系统的变频器的设计、液压机工程分析、应用程序开发过程中的关键技术。     

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.