抽油杆连续调质温控系统研究

针对现有抽油杆连续调质工艺存在的温控精度差、劳动强度大等问题,以单片机为核心,采用PID控制方法设计了抽油杆连续调质温度自动控制系统,实践表明该系统不仅能将温控精度控制在±10℃范围内,而且可有效减轻工人劳动强度。     

MEMS陀螺仪芯片级温控系统的设计

为了提高MEMS陀螺仪的温度性能,基于东南大学自主设计的TC10号温控陀螺表头,设计了一种芯片级温控系统.首先,研究了微加热丝和微热敏电阻的材料、结构以及表头的加工工艺,分析了温控系统的工作原理.然后,建立了表头内部的温度模型,利用Ziegler-Nichols经验参数法,确定了PID参数并进行系统仿真,验证了控制系统的快速性和稳定性.最后,结合模型和仿真参数设计了温控电路,并通过温度实验得到了微热敏电阻的温度特性曲线.结果显示:温控系统可将表头内温度控制在设定温度点附近;表头腔内温度和驱动模态谐振频率在-20～60℃范围内的变化量分别由温控前的78.453℃和3.76 Hz下降到温控后的4.949℃和0.48 Hz,由此验证了芯片级温控技术的可行性.     

基于单片机的温度检测系统的设计

针对目前温控报警系统的各种条件的限制,该设计主要以51单片机为主控芯片,使用最常见的温度传感器DS18B20来读取温度,并通过蜂鸣器、LED灯、手机电话等方式报警;该设计可以在-55℃-+128℃的温度范围内任意设定,且具有GSM模块手机报警功能为测温系统的设计提供了便利.     

加速度计温度控制系统设计与实现

为去除环境温度变化对加速度计输出的影响,系统在硬件上以AVR单片机为核心,设计了温度控制系统.系统采用恒流源设计的铂电阻温度传感器并利用单片机片内集成模数转换器实现传感器输出信号的采集.数据经单片机处理后输出PWM控制信号经光电隔离和功率放大后实现对加热片的控制.软件部分采用积分分离式PID控制算法,同时介绍了利用C#编程语言快速开发上位机的一种方法,以此上位机软件作为辅助工具对温控系统的控制器参数进行整定.从而实现了加速度计温度控制系统的闭环控制,满足了系统的精度要求.     

基于51单片机的恒温控制系统的设计

采用PID算法控制设计了基于51单片机的恒温控制系统,实现了具有远程通信功能的温度自动化调控.系统主要由控制模块、温度检测模块、通信模块、显示模块和电源模块5个部分组成.将各恒温控制系统组网可以实现多机协调的智能温控.     

基于Atmega8单片机的温度控制器设计

本文设计了一种基于Atmega8单片机的智能温度控制器。系统采用AVR单片机为控制核心、DS18820数字温度传感器采集温度信号送单片机处理,四位LED数码管实时显示温度值,可根据设定值实现报警和继电器输出控制。文中介绍了该控制器的硬件设计和软件设计以及实物制作和调试效果。该温度控制器测温范围为-55～125℃,可应用于各种温度监测和温度控制领域。     

基于MSP430和LabVIEW的温度控制系统设计

以16位超低功耗混合信号处理器MSP430F149和数字温度传感器DS18B20为硬件核心,以LabVIEW8.5为软件开发平台,设计了一个实时温度控制系统.通过串口将MSP430单片机采集到温度传感器的信息传递到上位机LabWIEW,LabVIEW对采集的信号进行分析和处理,实现温度的实时监测,同时将采集到的温度数据进行保存,方便系统运行时随时查阅和分析,该系统测量精度为0.062 5℃,与普通单片机相比其超低功耗的特性,可在内部供电的条件下对周围温度进行长时间实时监测.     

基于PT100的风机水帘控制系统集成设计

设计了一种风机水帘恒温控制系统,其中温控系统采用双路PT100温度传感器采集温度,单片机根据接收到的数据计算PT100的阻值,依据PT100的温度-电阻特性求出监测目标区域的环境温度,继而控制风机水帘的工作状态和报警装置,实现温度的自动控制和过限报警功能.Proteus仿真结果表明,本系统在温度控制方面完全能够根据环境温度合理调整风机水帘的工作状态.     

Y802型恒温烘箱温度控制系统的改进设计

对国产Y80 2型恒温烘箱在纺织纤维回潮率测试中的优缺点进行了分析 ,指出由于Y80 2型恒温烘箱采用水银接触温度计进行温度检测与转换、采用继电 /接触器控制系统控制烘箱的升降温 ,故存在超调量过大和温度控制不精确的缺陷 .在此基础上 ,提出采用铂电阻检测转换 -单片机控制晶闸管导通周波的方式进行Y80 2型恒温烘箱的温控系统的改进设计 .在控制软件设计中引入了模糊逻辑控制规则 ,从而使升温超调量大为减少且控制精度可从± 5℃提高到± 0 .5℃ .     

宽温环境下半导体激光器加固研究

介绍了在宽温环境下光盘机中半导体激光器的加固技术，推导了半导体激光器热平衡方程，热加固结构主要由半导体制冷器和ＡＤ５９０传感器组成。设计了温度传感电路、单片机电路和驱动电路，组成了半导体激光器单片机温控系统。对加固的半导体激光器在－２０～＋５５℃环境下输出功率的变化进行了分析。     

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.