五工位伸缩头的设计计算

伸缩头装置可以用多条带式输送机进行转载输送物料，大大提高工作效率，降低生产成本。有效的提高带式输送机的利用率。本文详细介绍了带式输送机五工位伸缩头设计原理及其整机的设计计算，详细阐述了系统结构及各部件的作用。     

浅谈变频器及其它新技术在带式输送机中的应用

随着生产力的提高和技术的不断进步,综采工作面装备水平得到了长足发展。目前煤矿运输顺槽用可伸缩带式输送机正在向高速度、大运量、长距离、大倾角、大功率方向迅速发展,其作为综采工作面煤矿运输环节中的重要组成部分,是保证煤矿安全生产,高产高效的重要设备之一。本文结合生产实际,现浅谈一下变频器及其它新技术在煤矿运输顺槽用可伸缩带式输送机中的应用。     

带式输送机机头传动装置结构的改造

徐州矿务集团夹河煤矿要求设计一部DSJ100/100/2X125型伸缩带式输送机,并且要求在16°倾斜巷道安装,而传统的DSJ100/100/2X125型伸缩带式输送机的机头传动装置只能用于水平巷道安装以保证减速器始终水平,如要在倾斜巷道安装,就必须对传统机头传动装置进行改造。     

SSJ80伸缩式带式输送机在机掘生产中的管理与维护

在煤矿机械化掘进生产作业中,根据煤量和机掘生产对机械的实际生产要求,SSJ80伸缩带式输送机得到了广泛的应用。这是一种钢架落地伸缩带式输送机,做为机掘生产的主要运输设备,它运行情况的好坏直接影响着生产效率的高低和巷道管理的难易程度。本文是通过长时间的工作实践,贴近生产实际情况,从实际应用管理出发,阐述了SSJ80伸缩式带式输送机在生产过程中的管理和维护。     

基于物联网的大型带式输送机智能监控系统

为提升散货码头大型带式输送机智能化监控水平,设计了基于物联网的大型带式输送机智能监控系统.在散料输送过程中,该系统可全程对带式输送机物料输送状态进行实时监控,实现了运行过程中物料瞬时流量、带速、功率等状态参数的实时监测,还可根据带式输送机物料瞬时流量远程调节带速,从而实现大型带式输送机系统最佳节能效果.实验结果表明,该系统具有智能化程度高、扩展灵活、性能稳定等优点,说明了系统设计的合理性、稳定性与实用性.该系统的构建和运行,可为港口大型带式输送机调速协调控制策略的制定提供决策支持.     

带式输送机横向稳定性分析

高速大运量带式输送机是其主要的发展趋势。在高速大运量带式输送机的设计、计算和使用中，动载荷是必须考虑的。本文从输送带横向振动分析入手。通过计算输送带横向振动固有频率，对带式输送机的横向稳定性进行分析。     

带式输送机托辊磨损的原因分析与解决方案

正托辊是带式输送机的主要构件之一,占整机成本的比例较大,托辊也是易损件,其质量的好坏直接影响输送机运行的稳定性,其损坏的托辊甚至会划伤输送带,造成更大的经济损失。因此,针对托辊磨损的原因进行分析,在设计和使用过程中对症医治,达到提高带式输送机的运行效率、降低成本。带式托辊的种类主要分为:安装在带式输送机的上分支,用来承载输送带和物一、带式托辊的种类     

煤矿带式输送机轴承监测诊断系统应用研究

在煤矿生产活动中,带式输送机属于常用运煤设备,承担着煤炭、矸石的转运任务。轴承作为带式输送机核心组成部件,为保证其工作状态稳定性,需建立监测诊断系统。该文通过翻阅文献的方式积累系统设计经验,并以试验的方式验证了所设计系统可行性与合理性,以此来积累相应的设计与应用经验,保证煤矿带式输送机工作状态的安全性。     

带式输送机动态分析系统的设计与实现

为使带式输送机系统的动态分析过程更简洁、更实用,适合大众需要,本文采用离散体动力模型法建立带式输送机的动力学模型,并以此为基础,以Visual Basic和Matlab为工具,设计出了带式输送机动态分析系统.该系统可计算不工况下运行的带式输送机系统的动力学参数,并实现了动态参数的可视化.实验证明,该系统能较好地对带式输送机的纵向动特性进行仿真.     

带式输送机液压自动拉紧控制系统

介绍了大型带式输送机张力自动调节的必要性,阐述了带式输送机张力液压自动调节装置的调节原理,设计了一种新型的带式输送机张力的液压自动拉紧系统,分析了拉紧装置的特性并构造了拉紧系统的传递函数,在此基础上构建了使用这种控制系统的带式输送机的动力学模型和数学模型.并利用该模型分析了输送带张力自动控制过程,用实例分析了张力自动控制系统的性能,应用simlingk软件进行了系统仿真,结果证明这种液压自动拉紧系统具有较好的适应性和稳定性.     

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.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that