基于STD总线模糊控制航迹自动舵实现

介绍了一种基于ＳＴＤ总线结构的模糊控制航迹自动舵,该自动舵硬件采用ＳＴＤ５０００系列工控机作为主机,含有丰富的输入输出接口;控制方式采用模糊控制,通过仿真证明,船舶可以快速稳定地跟踪航迹,系统具有较好的鲁棒性。     

智能积分型的船舶航向自动舵

针对常规PID自动舵中积分盲目、记忆了对航向控制不利的信息，导致超调增大、稳定时间延长的问题，提出了一种智能积分型PID自动舵；针对PID自动舵鲁棒性差的问题，采用了模糊控制，提出一种智能积分型模糊PID自动舵．这两种自动舵均应用智能积分控制，在船舶航向控制中的不同阶段采用不同的积分控制策略，通过特征辨识，仅保留有用信息，从而快速地消除了稳态误差．仿真试验证明这两种自动舵性能与原算法相比，性能改善，超调明显减小，稳定时间明显缩短．     

运用MATLAB实现基于遗传算法自修正的模糊控制理论的仿真

将遗传算法引入模糊控制的理论研究中,利用遗传算法对模糊控制输入隶属度函数进行在线自调整,并运用MATLAB语言实现对一个典型三阶系统的仿真,结果显示了该方法的有效性和实用性.     

基于RBF神经网络的船舶航向模糊控制

船舶自动舵性能的优劣直接关系到船舶的航行安全和经济效益，针对船舶运动具有非线性、大滞后等复杂性的特点，将神经网络和模糊控制应用于船舶运动控制中。仿真结果显示它不仅具有常规控制的性能，而且具有更强的鲁棒性和适应非线性对象的能力。     

基于ADAMS/CAR和模糊控制的汽车VDC仿真分析

在ADAMS/CAR中建立汽车整车模型,利用MATLAB模糊控制编辑器建立了模糊控制规则及模糊控制隶属度函数,并应用MATLAB/SIMULINK对汽车系统模型进行模糊控制仿真,达到验证基于模糊控制的汽车主动控制系统性能的目的.通过完成汽车双移线测试和角阶跃输入测试,得到汽车主动控制系统的仿真结果,仿真结果表明:具有模糊控制系统的汽车主动控制系统在测试中具有优越的躲避障碍物、主动恢复汽车稳定性的特点.     

模糊神经网络自动生成隶属函数的MATLAB实现

模糊控制是人工智能的一重要研究领域,将遗传算法、神经网络用于模糊控制,可实现模糊规则的在线修改和隶属函数的自动更新,使模糊控制具有自学习和自适应能力.用遗传算法优化具有全局性的隶属函数参数,一方面提高模糊控制的性能;另一方面也充分利用了操作人员的操作经验.本文用MATLAB语言编程来实现隶属函数的自动更新.仿真结果表明,用遗传算法来离线优化隶属函数是切实可行的.     

基于模糊PID切换的过热蒸汽温度控制

设计了一种可根据过热汽温给定值的偏差范围自动实现PID控制与模糊控制切换的模糊PID控制器．MATLAB仿真的结果表明,该控制方法与PID控制相比,具有响应快、超调量低、稳定性高、鲁棒性强等性能．     

MATLAB在锅炉水位模糊控制系统中的应用

目的针对锅炉水位控制系统的特点,设计锅炉水位的模糊控制系统。方法采用模糊控制理论进行了锅炉水位控制系统的设计,并应用MATLAB软件对模糊控制系统进行仿真。结果完成了锅炉水位模糊控制系统的设计以及控制系统的动态仿真。结论仿真实验结果表明,采用模糊控制策略,系统的响应速度快,控制精度高。     

变论域模糊控制在X舵抗干扰操纵中的应用

为了发掘X舵潜艇在持续高强度随机干扰环境下稳定操纵的能力,建立了某型X舵潜艇六自由度运动模型,分析了X舵的操纵规律,在X舵模糊控制主体、智能模糊积分环节及控制权限动态分配三个方面对X舵模糊控制系统进行了设计.仿真计算表明:模糊控制系统在潜艇低频和高频随机干扰力和力矩峰值分别为500 k N和400k N·m的作用下,基本能将深度和姿态稳定在期望值,控制效果明显好于比例积分微分(PID)控制器,但在高频干扰下存在小范围抖振现象.采用变论域思想对模糊控制系统进行改进,对深度、纵倾、横倾和航向的误差变化率采用论域在线调节机制,在同样的干扰环境下能够消除深度和姿态的抖振,实现对潜艇复杂条件下航行的精准稳定控制.     

应用MATLAB设计模糊控制器及仿真

模糊控制不依赖对象的精确数学模型而且模糊控制系统可以通过计算机仿真,本文在MATLAB环境下设计了水泥回转窑的模糊控制器并对它进行了仿真,结果表明MATLAB是进行模糊逻辑控制系统设计与仿真的强力工具。     

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.     

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.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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