沥青摊铺机找平系统研究

沥青摊铺机找平系统的性能直接影响到公路施工质量。本文简要介绍了沥青摊铺机找平系统,着重叙述了声控、RSS激光扫描、CAN总线和数字式控制器四大类典型自动找平系统。     

一维模糊PID控制器的仿真

针对二维及二维以上模糊控制器存在的缺陷,设计了一维糊PID控制器。该控制器采用“一维--三维”映射关系的模糊推理机,实现了P、I、D三个控制分量独立不相关的调整功能。通过与二维模糊控制器性能比较,仿真结果表明：一维模糊PID控制器具有相当好的系统功能特性。     

基于K-10协议的智能配电系统

利用集DTMF双音多频、遥控、计算机等技术为一体的K-10电力载波通信协议设计自动智能配电系统.该系统的硬件结构分为总控制器、功能控制器、迷你遥控器、控制终端和电话远程语音控制五大部分,软件结构分为总控制器、功能控制器和控制终端三大模块.该系统以交流电力线为控制信号传输总线,省却了布置控制线路的麻烦,结构简单、实用性好,能够实现现代家庭、办公楼宇的电器控制、照明控制、线路配电、安全监控等方面的自动化、智能化.     

单片机在数控机床上的应用研究

本文研究将ＭＣＳ－５１型单片机用于普通数控机床，通过监控程序设计，进一步完善机床性能，使该系统具有显示功能，快速点动、自动四零、自动升降频率、自动换刀、自动齿隙补偿、刀具磨损补偿，暂停等多种功能．     

MK9－PA8卷烟机的一种可编程序控制系统

本文介绍了ＭＫ９－ＰＡ８卷烟机的一种可编程序控制系统。该系统以可编程序控制器ＰＣ为核心，可实现对卷烟机工作过程的自动控制。该系统具有体积小、功能强、可靠性高、编程简单和维修方便等优点，已在数家烟厂推广应用。     

PID-Fuzzy分段式控制方法在太阳跟踪系统中的应用

基于自动跟踪光伏发电系统,对太阳位置的检测和光电池云台跟踪控制的问题进行了深入的分析,并提出了PID-Fuzzy分段式跟踪控制方法。通过对太阳方位角的分析计算和电池板方位角的检测,设计了以太阳方位角为输入量、电池板方位角为反馈量的PID-Fuzzy控制器。该控制器可以依据角度的偏差大小来自动切换控制规律,较好地解决了系统快速性和跟踪精度的问题。并且通过Matlab仿真和实验数据对该控制器性能进行了分析。结果表明,该方法不仅降低了调节时间,而且使控制跟踪精度在原有精度基础上提高了2%,有效地提高了光电转换效率,为同类跟踪系统提供了可行性方案。     

船舶直线航迹控制的鲁棒自适应非线性设计

针对船舶航迹控制非线性系统模型中存在的不确定性和外界干扰的影响，提出了一种鲁棒自适应控制算法．该算法将鲁棒干扰抑制技术融入自适应反演设计方法中，使得系统的输出和所得闭环系统全局一致最终有界，而且闭环系统的控制性能可以通过适当的选择设计参数而得到保证，另外，该算法还避免了控制器可能存在的奇异值问题，在计算机仿真研究中，以大连海事大学“育龙”号实习船为设计实例，验证了所提出的控制器的有效性。     

打包机自动称重系统的改进

摘要：介绍了打包机称自动称重系统的改进设计,有效地解决了原打包机电子秤自动称重系统中存在的成品包重称重问题。提出了该自动称重系统的改造方案,增加小型可编程控制器和触摸屏的使用实现原有功能,优化了打包机自动称重系统,提高了纤维生产线自动化控制水平。     

公路沥青混凝土摊铺自动找平控制

本文利用计算机仿真的方法研究具有电液比例控制的自动找平控制和特性,从而对计算机仿真在自动找平控制中的应用进行探讨。     

自动送钻实验系统的优化加权模糊控制

针对自动送钻实验系统，设计了一种带优化加权因子的模糊控制器，以ITAE积分性能指标为寻优目标函数，通过对误差和误差变化的加权因子的优化来获得系统的最佳模糊控制规则，并将其控制效果与一般模糊控制器的效果进行了仿真比较。结果表明，一般模糊控制器作用于自动送钻实验系统时，由于超调量太大，系统难以正常工作；带优化加权因子的模糊控制器可使系统的超调量降到4％，调节时间为17s，稳态误差小于0.1%，其他性能指标均满足要求，大大改善了系统的动态性能。     

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