某火箭炮高低平衡机改进设计的探讨

本文从总体布置着手,对火箭炮高低平衡机进行重新设计,采用了复式螺杆推式高低平衡机,讨论了传动三角形的确定和高低机、平衡机特性及其对定向器稳定性的影响,为取得满意的平衡曲线,采用了变刚度弹簧平衡机,并详述其设计方法。这样,保证火箭炮得到最小的不平衡力矩,且在常射角下不改变方向,从而消除了间?对密集度的影响。     

火炮高低平衡机的设计

对某榴弹炮的高低机和平衡机部分进行了一些改进,采用滚珠丝杠传动副和滚柱自锁器等装置,使高低机与平衡机结合为一体,实现了减小手轮力、减轻重量的目的。     

全自动平衡机系统研究

介绍了一种全自动平衡机系统的组成及体系结构，并结合这种体系结构给出了系统的控制过程，分析了控制过程中的关键技术及实现方法，提供了去重模型，在此基础上研制了样机并给出了试验结果及结果分析。试验及实践结果表明，研制的全自动平衡机系统能较好地实现对不平衡转子的动平衡修正。     

重力式平衡机的灵敏度分析

重力式平衡机是利用偏重力矩检测盘状零件不平衡度的一种设备。它有一个很灵敏的零件架。本文对它的三种支承型式的灵敏度进行了分析,弄清了影响平衡机灵敏度的有关因素,从而,为设计高灵敏度的重力式平衡机指明了途径和方法。     

平衡机应用与计量

主要介绍了平衡机的发展情况,分析平衡机工作原理以及其分类。最后概要分析了平衡机在量值溯源上的方法。     

车用发电机转子动平衡机的研制

车用发电机是汽车运行时的主要供电设备。发电机转子的不平衡严重影响发电机的性能和使用寿命。本文介绍了转子动平衡的力学原理，采用非电量电测技术和单片机技术进行了发电机转子动平衡机的研制。介绍了平衡机的工作原理和工作过程，给出了平衡机的硬件测试电路和软件流程。     

重型燃机压气机-透平转子组件动平衡解决方案

重型燃机压气机-透平转子组件总长5m、最大旋转直径2．9m、重量约为22320kg。转子组件由压气机盘和涡轮盘及前后轴颈等件组成，转子组件整体刚性差且结构特殊，前轴颈支点缩进压气机盘内，后支点轴套距后轴颈篦齿很近，与平衡机摆架位置干涉，此结构转子组件动平衡在国内尚属首例，本文着重介绍转子组件动平衡解决方案。     

自动补偿式平衡机控制系统研究

火炮液体气压式平衡机随着温度的变化,平衡机内气体压力变化比较大,常常偏离设计要求气压值,出现手轮力过大的问题,为了解决此种问题,本文研究一种能够自动补偿气压的控制系统,实现平衡机内的压力的自动调整,实现控制手轮力的目,进一步改善了火炮的操作性能,提高火炮的瞄准速度.     

天平式静平衡机的研制及应用

本文研究了转动件的静不平衡问题，介绍了静平衡过程中一些影响因素的消除方法和新的平衡原理，从而消除了已有的静平衡机在平衡过程中摩擦所产生的影响．     

高炉内料层结构动态追踪的技术开发

炉料径向分布影响着高炉下部所形成软熔带的形状和位置，进而间接决定和控制了高炉燃料比的高低.建立了预测高炉内部料层结构的数学模型，并将其转化为可视化界面的软件，供现场人员在线使用，用于计算不同布料参数下料层结构的详细信息，布料参数包括布料矩阵、料线高度、布料方向、径向下降速度分布，预测结果包括径向矿焦比分布、追踪料层位置、料层厚度变化.计算结果均可为现场布料制度优化提供参考依据.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the