基于AVR单片机的清洁机器人控制系统设计

实现了一种基于ATmega128单片机的清洁机器人控制系统,包括硬件设计以及软件算法的实现.控制系统硬件部分传感器包括红外测距传感器,碰撞开关,红外测速传感器等.红外测距传感器、碰撞开关用来感知障碍物,红外测速传感器用来检测驱动轮的速度,电机为驱动轮以及清扫机构提供动力.本文软件部分采用了全覆盖路径规划算法,为环境建立固定坐标系,以沿边行走方式探测环境信息,实现了清洁机器人区域全覆盖行走功能.     

电容式数字微位移传感器的研究

设计了一种基于AD7745芯片的数字式的电容微位移传感器,采用屏蔽电缆和电容保护环技术,有效降低杂散电容的影响。采用数据滤波技术对采样数据进行处理,提高了测量的准确性和重复性。实验结果表明:该电容微位移传感器的分辨力为0.01μm,全量程线性度0.05%,性能较传统电容位移传感器有较大提高。     

高线性数字式电容微位移传感器

设计了一种基于AD7745芯片的数字式的电容微位移传感器，采用屏蔽电缆和电容保护环技术，有效降低杂散电容的影响．采用数据滤波技术对采样数据进行处理，提高了测量的准确性和重复性．实验结果表明：该电容微位移传感器的分辨力为0．01μm，全量程线性度0．05％，性能较传统电容位移传感器有较大提高．     

实况测试拖拉机驱动轮扭矩的传感器研制

阐述了研制实况测试拖拉机驱动轮扭矩传感器的必要性和方案选择,并结合东风-50拖拉机,介绍了这种传感器的设计和研制方法及传感器的标定结果和使用情况。最后指出:这种传感器的设计、研制方法,还可作为其它有关车辆驱动轮扭矩测试的参考。     

基于伸缩杆结构的光纤光栅多级应变传感器

为了扩大光纤光栅称重传感器的测量范围,提高传感器的测量精度,在理论上设计了一套新型的可以扩大测量范围、提高测量精度的系统,并通过Matlab平台仿真.结果表明,单级传感器在波长变化小于0.2nm时具有良好的线性度.该系统将双光纤光栅串联,分别粘贴于等强度梁的上下两侧,采用光强解调的方法实现对光纤光栅输出信号的解调;在解调基础上,利用伸缩杆结构传递载荷重力.实验测试结果验证了多级应变测量的可行性,在保证分辨力的同时扩大了传感器的测量范围.     

消息

我校一项课题通过省级技术鉴定2005年7月9日,由我校交通与车辆工程学院杨仲玉老师等主持完成的“汽车、发动机智能燃油消耗测量系统”项目,通过了山东省科技厅组织的技术鉴定。该项目开发的QFY-1型汽车发动机油耗传感器供油系统,不改变被测车原供油系统的压力,不影响汽车发动机工作条件;设有油气分离装置,消除了气体积累的测量误差;油耗传感器采用四活塞串流式计量器,并具有判向功能,能消除柴油发动机运转时供油系统中燃油脉动而带来的测量误差;设有压力表,可直观显示发动机工作时的进油、供油、回油压力;油耗传感器设有手控/遥控转换开关…     

基于改进遗传算法的微型电动车轮毂电机优化设计

为了获得高效率和低成本的微型电动车轮毂电机,优化设计一种新型驱动轮毂电机。介绍简单遗传算法和模式搜索法在驱动轮毂电机优化设计中的应用,针对它们优化设计效果不显著的缺点,提出一种改进的遗传算法。在对微型电动车轮毂电机进行研究的基础上,针对驱动轮毂电机设计特点,重新建立驱动轮毂电机优化设计数学模型,并以实例进行优化计算。研究结果表明:驱动轮毂电机的效率提高,成本降低,能满足微型电动车对驱动轮毂电机的使用要求,因此,对于驱动轮毂电机的优化设计,改进遗传算法是一种比较理想的算法,具有广阔的工程应用价值。     

基于模糊控制的自动引导车实验研究

近年来国内外对自动引导车的理论及应用研究受到越来越广泛的关注,特别是对所进行的实验研究,具有深刻的实际意义.该文介绍了一种自行研制的三轮自动引导车,其两前轮为驱动轮,后轮为一万向轮,车体采用金属框架结构.主控单元为P87LPC769单片机,通过模糊控制技术对自动引导车直线、转弯行驶进行实时控制.实验结果表明该模糊控制算法的有效性.     

油/气管道检测机器人

在轮式和履带式机器人的基础上,设计开发了一种新的管内移动机器人.机器人的3组驱动轮沿圆周方向120°均布,在轴向截面内,前后两组驱动轮布置在同一组平行四边形机构上,驱动电动机通过蜗轮蜗杆副驱动3组驱动轮,调节电动机通过滚珠丝杠螺母副和压力传感器使3组驱动轮始终以稳定的正压力紧贴在管道内壁,使机器人具有充裕并且稳定的牵引力.该机器人机构紧凑,工作可靠,适用于管径为 400～650mm的管道.     

光学微扫描显微热成像系统超分辨力图像处理方法研究

为提高已研制光学微扫描显微热成像系统的空间分辨力,基于改进的频域图像配准技术和凸集投影超分辨力算法,提出了显微热成像系统光学微扫描超分辨力图像处理方法。给出了该方法的原理及步骤,采用不同重构方法行了仿真研究,给出了评价参数和结论。利用光学微扫描显微热成像系统采集低分辨力显微热图像序列进行了超分辨力处理实验,实验结果表明本文提出方法的有效性,光学微扫描显微热成像系统的空间分辨力得到提高从而可满足需要高分辨力显微热分析的场合。该方法还可以应用于其它不可控光学微扫描成像系统中,具有广泛的应用前景。     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with