二维物体斜面黑线运动光电传感器应用研究

系统运用机械运动原理、自动控制技术、传感器技术及单片机控制技术让物体能沿2厘米宽无规则黑曲线运动、到达指定坐标点、画圆等二维空间运动要求.在凌阳单片机的控制下,采用键盘作为外部数据、命令控制输入.同时系统采用了两个交流减速齿轮电动机、两个定滑轮、以及其他的辅助设备作为悬挂物体运动控制装置.系统实现了数据处理、电机控制、识别黑色曲线、选择正确的移动寻迹方向等功能.本文主要研究识别黑线的传感器组合,提高走线准确度.     

三维悬挂物体运动控制系统

采用单片机AT89C55作为悬挂物体运动的控制核心,利用可编程器件GAL16V8实现的脉冲分配器和大功率驱动芯片L298共同组成步进电机驱动电路,结合软件控制电机的转向和转速,基于可靠的硬件设计和精确的软件算法,实现了物体的定点运动控制和轨迹运动的设定.另外,系统还具有无线远程数据的传输和控制功能,并采用双口RAM IDT7132将主CPU AT89C55和从CPU AT89C51进行隔离,保证了数据传输的稳定性和可靠性.     

悬挂运动控制系统的设计

介绍了以步进电机作为执行元件,单片机AT89S52作为控制器,SH-2H057作为步进电机驱动电路的悬挂运动控制系统的研制,实现了物体在二维平面运动的控制·1系统结构本系统在运动过程中需将物体所在坐标转换为牵引线绳的运动距离,进而转换为步进电机的运转步数,从而实现对物体在二维平面上的高精度运动控制·整个系统包括单片机控制部分[1]、步进电机及其驱动装置[2]、键盘显示等部分(如图1所示)·图1系统设计框图2控制原理分析物体位于二维平面任意点的坐标为(x,y),所对应的两段绳长分别为La=(115-y)2 (15 x)2,Lb=(110-15-x)2 (115-y)2·所…     

类人眼双目机器视觉实验平台

构建了一个两摄像头光轴角度可变的双目机器视觉实验平台.该平台在进行物体的跟踪、测距时,可进行变焦操作,实现了对大范围运动物体的监控、监测.论文给出了涉及的三个关键技术,被测物体的图像匹配,目标的跟踪和物体距离的测量方法.     

基于Camshift的目标跟踪和游戏控制器的设计与实现

以Mean-Shift算法思想为基础,通过对连续的图像序列做Mean-Shift处理,并以前一帧的输出结果作为后一帧的输入,即Camshift,实现对运动物体的跟踪并监测被跟踪物体的运动状态.根据该状态发送相应的键盘按键消息,以达到模拟键盘控制游戏的目的.程序实现了对单个物体、两个物体的跟踪控制,其中对两个物体的同时跟踪,可以根据被跟踪物体的运动状态进行组合,模拟更丰富的消息.实验表明,Camshift算法可以较好地工作,得到满意的跟踪结果.     

悬挂运动自动控制系统

本文根据全国大学生电子设计大赛题目“悬挂运动自动控制系统”的基本要求。选用步进电机作为系统的驱动电机．以AT89S51微处理器作为控制核心，驱动芯片L298N作为微处理器与步进电机的接口电路。键盘和数码显示为人机接口，较好的完成了悬挂运动控制系统的硬件设计．算法方面通过以微小直线为单位的策略．完成较为复杂的长直线和圆周运动轨迹的控制．具体设计算法是将物体运动的坐标转化成悬绳伸缩的距离，进而计算出步进电机的步进频率．对于系统自定的确定线型（直线和圆周），通过调整两个步进电机不同的步进频率的搭配。可以控制物体的运动方向，从而完成实际轨迹控制的基本要求．实验证明该控制系统控制精度高。完全达到了题目的具体要求，这种系统可以移用到需要精确定位和运动控制有严格要求如绘图仪等的场合，从而满足人民的实际需要．     

两体问题中基本运动定理的相对运动形式及其应用

将两个相互作用的物体的运动（u《c）作为一个孤立系统来考虑就是两体问题，如双星运动、两体碰撞等。不受其它物体作用的两个物体的孤立体系在相互作用过程中动量、角动量和能量均守恒，但两个物体都有运动，都有加速度。在处理两体问题时，由于相互作用力与相对位置有关，如两质点之间的万有引力以及两点电荷之间的库仑力均与二体间距的平方成反比，     

多指手的协调阻抗控制

采用协调阻抗控制解决多旨手在自由空间和受限空间的控制，这种方法可调节物体位置和对外界作用力间的阻抗关系，实现所需的物体动态性能，同时，考虑了多个手指间的协调，并对自由运动和受限运动的情况作了仿真。     

基于纹理和小波变换的阴影检测去除算法

在基于视频处理的室外场景运动物体检测系统中,对运动物体的阴影进行检测与去除是一个关键环节。文中提出了一种基于纹理自相关和整数小波变换相结合的运动物体阴影检测与去除算法,算法中首先使用纹理自相关对运动物体的阴影进行预提取,再对阴影预提取结果进行统计判别,对判别为阴影误检的区域再进行基于整数小波变换的阴影再检测,最后将两次检测结果相结合实现对运动物体阴影的检测与去除。实验结果表明：文中的方法不仅能够准确地检测出与背景灰度差别比较大的运动物体的阴影,而且能够较好地检测出与背景灰度相近的运动物体的阴影,较好地克服了使用单一方法进行阴影检测与去除时常见的阴影误检问题,获得了很好的阴影检测与去除效果。     

匀变速直线运动的判断

以物体做匀变速直线运动的判断方法，对利用位移差相等来判断物体是否作匀变速直线运动进行分析，论证了位移差相等只是判断物体作匀变速直线运动的必要条件，给出了该判断的的充要条件对验证匀变速直线运动的实验提出了采用频率可调打点计时器和对运动物体增系一个速度计等改进意见。     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-