传感器技术在公路称重系统中的应用

传感器技术被广泛地应用于工业、军事和日常生活等各个领域,本文主要讨论传感器技术在收费公路车辆动态称重系统中的应用,介绍了称重传感器的工作原理和动态称重的主流技术,并展望称重传感器技术的发展趋势。     

淀粉称重包装控制器的设计实现

针对淀粉物料的特点设计了一种称重包装控制器,分别利用了ＰＬＣ和单片机的特长组成系统,给出了系统的使用特点,如系统参数的三级存取。并给出了一种动静结合的显示电路     

基于MSP430的称重装置设计

本文主要介绍一种基于MSP430的称重装置系统的结构和实现方法,重点从硬件上对其进行设计和分析,并给出软件流程图和主要程序。     

一种基于BP神经网络的快速称重新方法

在研究人工神经网络的基础上,提出了一种基于BP神经网络的电子吊秤快速称重测量的新方法。将BP神经网络应用于拟合称重传感器的输出特性,并在MATLAB下通过训练和仿真验证了应用BP神经网络实现电子吊秤快速称重可行性及优越性。     

高速公路动态称重与静态称重的利与弊

从计重收费的要求,根据实际使用的情况出发,分析比较了计重收费中应用的这两种方法——动态称重与静态称重的优点和缺点,并且总结了应用静态称重的需注意的细节。     

连续梁桥车辆动态称重系数解析与试验验证

基于桥梁响应的车辆动态称重方法具有成本低、易维护和耐久性好等优点,但其称重精度依赖于称重系数的准确性。以典型三等跨预应力混凝土连续小箱梁桥为应用背景,首先推导了车辆重量与桥梁响应指标之间的相关数学表达式,给出了车辆称重系数的定义和理论解析解,同时指出针对实际宽幅桥梁,应根据车辆横向位置修正对应的称重系数;其次,利用两车道随机车流对该桥有限元模型进行加载并提取桥梁响应,得到了车重与响应之间的相关曲线和相关系数;最后,在实桥上设计安装了桥梁动态称重系统（BWIM）和路面动态称重系统（PWIM）用于监测通行车辆信息,通过匹配算法得到大数据统计下的车辆称重系数。研究结果表明,本文提出的车辆称重系数解析解与仿真结果误差在1.8%,实测称重系数与理论解析解、数值仿真结果绝对误差在1.73%。最后值得说明的,针对诸如简支梁、不等跨连续梁等其它类型桥梁,可借鉴本文的研究思路,得到桥梁不同位置处的车辆称重系数,同时建议在实际工程应用中分别对理论、仿真和实测的称重系数相互校核,提高标定的准确性。     

应变式称重传感器技术动向和发展趋势

本文从强化企业竞争力和适应国内外市场竞争需要出发,分析我国称重传感器现状和主要差距。参照国际称重传感器技术发展潮流,在分析近年来研究与应用的新技术、新工艺、新产品和电子衡器新需求的基础上,探讨了称重传感器发展趋势和近期的技术课题。     

对弯板式与普通称台式称重系统应用的探讨

文章对弯板式与普通称台式在称重应用场合、称重数据精准度、安装使用及维护等方面进行对比分析,根据实际施工中遇到的一些问题,对弯板式与普通称台式称重系统在高速公路治超检测中的应用提出自己的看法。     

动态称重系统在治理超限超载中的应用

根据我国治理超限超载车辆的实际情况,对比静态称重和动态称重的特点,本文提出以动态预检测为手段以提高检测效率、减少滞留车辆的延误时间,从实例中分析动态检测系统的原理和结构,介绍动态称重的优点。     

基于二系载荷调整的机车轮轴重量优化分配方法研究

本文结合"车体称重调簧试验台"的研制开发工作,对基于二系载荷调整的轮轴重优化分配试验系统的可行性和适用范围进行研究,以机车车体——转向架作为研究对象,选用经典力学方法建立了相应的模型来求解二系弹簧加垫高度和机车轮(轴)重分配之间的关系,从理论上研究了车体二系支承载荷分配对于轮(轴)重分配的影响规律,利用SUMT-Newton算法对加垫量进行寻优运算。仿真计算结果表明,车体与转向架装配后的轴重偏差大部分情况下都可以通过二系加垫调整得以减小,说明了基于二系载荷调整的机车轮轴重量优化分配算法的有效性。     

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.     

A computer generator for randomly layered structures

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

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。     

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     

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     

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

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.