STM统计时分复用系统的研究

使用Keil Software公司的aVision2 IDE作为开发工具，采用一条简易的HDLC帧结构作为统计时分复用系统的数据通讯协议，制定两个数据发生模块来模拟实现两路数据(19．2Kbps或9．6Kbps)的收发，并能实现加复和解复，数据环路、数据校验等，且将数据存于解复后的各路数据缓冲区中，并向控制台返回状态参数．研究表明该程序模块真正实现了仿真的效果，且在实际的系统中也能有很强的移植性．     

ARM的CAN总线控制系统智能数据采集节点的设计

提出了一种基于ARM7微控制器LPC2292的CAN总线分布式控制系统智能数据采集节点的设计，给出了系统硬件框图，数据采集、CAN通信初始化、数据发送和数据接收等部分的程序设计流程图，所设计节点实现方法简单，外扩器件少，蛄构合理，可靠性高，且节点扩展方便，已用于某工业现场，波特率为10Kbps．图7，参8．     

异结构分数阶复混沌系统的双混合函数投影同步

基于追踪控制法,设计了普适的非线性控制器,实现了异结构分数阶复混沌系统的双混合函数投影同步.以复Lorenz系统,复呂系统为驱动系统,复T系统、复Chen系统为响应系统作为案例,根据所提方法实现了驱动、响应系统的双混合函数投影同步.数值仿真验证了所提方法的合理性.     

基于VTK的颌面缺损修复的计算机辅助设计系统的实现

研究设计并开发了一套可用于颌面缺损修复的计算机辅助设计系统.系统使用视觉化工具函式库(visualization toolkit,VTK)作为开发工具.数据源可以是CT扫描获得的三维数据,也可是已经存在的.stl格式的三维表面数据.系统主要通过将健康侧数据镜像到患侧,或读入本地数据库中的数据,对缺损部位进行填充、平滑等处理,从而生成贋复体.系统还可将生成的贋复体以.stl格式输出;并利用快速成型加工系统进行加工.该系统的建立可实现颌面缺损修复中贋复体的个性化快速制作,从而提高制作质量,降低其操作难度.     

不同发送速率下移动自组网DSR 的性能比较

基于对多媒体业务的支持, 在144 Kbps 发送速率下研究了移动自组网中路由协议DSR( 动态源路由) 的性能,并与2 Kbps 发送速率下的性能进行了比较. 结果表明: 与2 Kbps 发送速率下相比, 144 Kbps 发送速率下的报文投递率要低,同时平均端到端的时延、路由负荷、MAC 负荷也高; 对于不同源节点下的性能, 144 Kbps 发送速率表现出与2 Kbps 发送速率不同的变化趋势.     

面向LTE基站的SoC平台软件

从第一代模拟无线网络、第二代GSM通信网络、第三代3G通信网络到目前商用的4G LTE通信网络,直至正在研究的5G通信网络,移动通信技术的发展异常迅猛.从GSM 的TCH9.6Kbps、GPRS的171Kbps、WCDMA及TDSCDMA的384Kbps、HSDPA的14.4Mbps到目前LTE的下行100Mbps,数据的传输速率也越来越快.     

基于采样数据二维连续线性系统的混沌反控制

针对状态矩阵具有复特征值的稳定二维连续线性系统,提出了一种基于采样数据的混沌反控制方法.该方法以给定的采样周期对连续系统进行采样,由采样数据的正弦函数构造反馈控制器,使连续系统产生混沌.在每个采样周期内保持控制项不变.数值仿真结果证实了该方法的有效性.作为一种数字控制技术,该方法设计的控制律较连续控制律更易于工程实现.     

基于GPRS网络热电厂汽网数据监测系统

为了保证供热质量及现场计量数据的远程实时在线监测,设计了一种基于GPRS网络技术分布式监控系统,系统由智能采集终端、GPRS网络、Internet网和监控中心服务器组成,在监控结点之间提供一个透明的数据传输通道,实现了远端结点与监控中心进行实时数据交换。通过现场运行,证明该系统实际应用时,数据传输速率在40Kbps左右,有效地解决了传统人工抄表费时费力效率低的难题。     

基于ZigBee技术的无线RFID读写系统

将ZigBee技术与RFID技术相结合,设计一套无线RFID读写系统.在系统硬件结构中,以CC2530作为射频模块的微控制器和ZigBee无线通信节点的射频芯片,以MFRC522作为读写器的射频芯片.在VS2008平台上构建可移动RFID读写器应用软件.通过实验验证,该系统能够实现长距离识别,且数据信息的可靠性和保密性高,成本低,灵活性和扩展性好.该系统可以拓宽RFID读写器的应用范围.     

具有中间压力调节功能的新型自复叠热泵

提出了一种带中间节流的新型自复叠热泵系统.通过增加节流元件来调节中间压力,以实现系统的气液分离器进口制冷剂状态与冷凝器出口制冷剂状态相对独立.用自编制的循环性能程序对新型的和传统的自复叠热泵系统进行了理论对比分析,结果表明:采用新型自复叠热泵系统,经较充分换热后冷凝器出口制冷剂在具有一定范围且干度较小的条件下,通过调节中间压力可避免压缩机吸气带液,从而提高系统性能,解决传统自复叠热泵系统的性能不稳定问题.与最优工况下的传统自复叠热泵系统相比,所提系统能使制热性能提高19.1%,容积制热量提高28.9%.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the