浅谈液压支架推移装置的设计计算

通过对液压支架推移装置在实际应用中常见的损坏形式的概述,针对其中一种损坏方式对液压支架推移装置的受力工况进行了分析,通过对推移装置稳定性、强度的设计计算,分析了液压支架推移装置的受力工况、计算方法。并通过实例分析,提出了几点设计时应注意的问题。     

动态模拟应用在海上气田工艺设计上的探讨

为了解决稳态模拟不能真实反应流程在诸如启动、关断和事故泄放等紧急工况下的参数变化,以某海上气田为例,通过使用动态技术来对实际生产装置进行模拟,得出在这些工况下更贴近实际的参数变化,据以在设计中提高该气田生产分离器两级超压保护的可靠性,降低火炬系统泄放能力,减小安全阀泄放量,从而降低了相关设备的选材等级,优化了工艺流程设计,完善了工艺设计的安全保护措施,降低了工程投资。     

三组分热泵单塔空分流程的模拟与分析

本研究组之前提出深冷空分装置的热泵单塔流程工艺(称热泵单塔空分流程),并对其进行稳态模拟研究.但该模拟仅以氧、氮二元组分为对象,为更好的与实际过程相符,本研究针对氧、氮、氩三元组分的热泵单塔空分流程进行模拟与分析.研究表明,氩的引入降低了流程的有效能效率和氧的提取率,同时使污氮侧线出料成为必要.在模拟的基础上还考察了塔板数、氧气的流量、污氮的侧线出料位置及流量等因素对该流程操作过程的影响.通过该部分研究工作,为热泵单塔空分工艺的工程化设计时塔板数、产品流量、侧线出料位置及流量等参数的确定提供了参考.     

轨道车辆PT温度传感器振动检测实验台结构设计

为了检测轨道车辆PT(铂)温度传感器在振动条件下的性能,设计了轨道车辆PT温度传感器振动检测实验台。根据传感器实际工况确定了实际工况模拟条件以及振动检测实验台机械结构。应用ANSYS软件对关键部件进行有限元分析,CATIA软件对各部件进行建模。实验仿真曲线表明,该检测实验台能准确模拟PT温度传感器的实际振动工况。     

正压浓相气力输送系统输送特性的实验研究

对工业规模的正压浓相气力输送系统,在完全模拟实际工况的条件下,进行了固粒气力输送运行特征和操作参数的试验研究。对输送距离为200m的正压浓相气力输送运行特性作了比较全面的定量描述和分析,试验结果揭示了气力输送的运行效率及其与输送参数的关系;澄清了某些工程中的提法;获得了最佳的运行工况点。所得结论可成为系统运行和新装置设计时主要参数的确定依据。     

前置灯泡贯流泵装置内部流动数值模拟

基于雷诺时均方程和RNG(renormalization group)k-ε湍流模型,采用SIMPLEC算法对一前置灯泡贯流泵装置内部湍流流场进行数值模拟.分析了前置灯泡贯流泵装置的内部流动特征,进水流道内的流态比较平顺,而出水流道内的流态则是在非设计工况出现明显的偏流和漩涡.同时,预测了不同工况下前置灯泡贯流泵装置的水力性能(包括扬程、效率等),最优工况点的效率达76.24%.为今后前置灯泡贯流泵装置的设计优化提供了依据.     

流程模拟在大型尿素装置操作优化中的应用

在完善水溶液合循环法尿素装置模拟优化系统的基础上，增加了新的模块，开发了适于改良Ｃ法的大型尿素装置的计算机应用软件。利用该软件的流程模拟功能对现场生产装置的操作工况进行了模拟分析，找出了装置低负荷运行存在的问题，提出了优化的操作方案，用于指导实际生产操作，以达到降低能耗的目的。     

高速列车电动拧紧装置在线智能检测技术的研究与应用

论文详细介绍了高速列车领域一种电动拧紧装置在线检测设备及其技术.设备由智能螺栓模拟器、液压控制装置和综合测试分析系统构成,可通过模拟实际生产工况对工具进行在线检测,实现各拧紧工艺质量控制,保障高速列车关键部件的质量要求,提升高速列车产业在线检测技术水平.     

集中供热空调系统水力工况的动态模拟和控制

利用集中供热空调系统水力工况计算机模拟分析软件，确定了系统水力工况调节控制值的新方法．对实际投入运行的供热系统在不同气候条件及不同用户特点条件下的运行控制策略进行了模拟分析，提出了系统的控制方案．设想利用现代控制理论和计算机模拟分析相集合，采用系统实际运行工况动态检测数据对系统的水力工况进行模拟分析，实现系统的远程自动控制．     

车用涡轮增压器瞬态性能实验装置设计与分析

设计一种瞬态性能实验装置来模拟发动机实际工作压力波形.通过改变瞬态性能实验装置的通流截面积,来获得不同的脉冲压力波.对实验装置进行结构设计,重点设计装置通道形状,通过仿真分析得到装置的出口压力波形,最后进行装置试制和试验验证.试验结果表明,设计的瞬态性能实验装置可以很好地模拟发动机的不同排气压力波形,对涡轮增压器的瞬态特性分析有一定参考价值.     

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.     

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.     

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.     

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.     

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.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-