MODBUS协议在中子发生器控制台中的应用

针对中子发生器控制台在高压放电环境下数据传输不稳定的问题,采用在控制台中移植容错能力和可靠性都很高的工业标准通信协议——MODBUS协议,实现了控制台在高压放电环境下数据的可靠传输,可稳定、快速地控制中子发生器.实验结果表明,嵌入MODBUS协议的中子发生器控制台在110kV高压强烈干扰下,能够连续准确收发数据,确保中子发生器更加精确、稳定地运行.     

LabVIEW环境下中子发生器控制台上位机程序的设计与实现

在中子发生器控制台上位机的软件设计上,采用了LabVIEW虚拟仪器开发环境和方法,实现了中子发生器控制台上位机与下位机之间的数据传输与控制.和传统的上位机控制界面相比较,其优点是控制程序易于编写,界面更为友好,测试操作简单,而且系统稳定性和抗干扰性大为提高.     

基于蓝牙技术的Linux系统和手机终端通讯实现

通过对在Linux下蓝牙Bluez协议栈的具体分析,给出了其作为蓝牙无线通讯服务端的具体实现方式.通过对基于Java的JSR82规范的分析,给出了其基于手机终端无线通讯的具体实现方式.将以上2种方式结合在一起,实现了手机终端和Linux系统之间的基于蓝牙技术的无线通讯.实践证明:这种无线通讯方式成本低,有极大的应用前景.     

利用蓝牙技术实现e-space资讯终端和e-casting广播系统

借鉴Internet、GSM、CDMA等信息网络服务的相关经验,按照self-help模型实现e-space资讯终端,按照push模型实现e-casting广播系统.e-space资讯终端是集计算机、无线通讯、以太网技术为一体的手机自助站系统,主要依托蓝牙、红外两种无线手段,实现手机图片、铃声、音乐、视频等下载,并具备手机数据上传功能,可将手机内的照片上传到自主站上进行编辑和输出打印.e-casting广播系统是一种信息推送工具,主要通过多个蓝牙接口,向广播站周围的蓝牙设备推送各类信息,可用于广告市场推广和公用信息广播.     

基于Android移动式心电监护系统的设计

设计了一种基于Android的移动式心电监护系统,该系统由STM32嵌入式心电采集模块、串口蓝牙模块、Android智能手机组成.嵌入式系统采集心电数据,通过蓝牙传输到Android智能手机终端,在手机端实现心电数据的显示、存储,并通过百度云客户端实现心电数据上传,以实现与远程医疗中心的交互.     

基于Android的电视手机遥控系统

本文设计了一款基于Android平台的电视手机遥控系统.该遥控系统以手机作为控制终端,利用手机蓝牙发送控制指令到协议转换器,通过协议转换器对指令数据处理并转换为红外信号,实现对电视等红外家电的控制.实验测试证明该遥控器具有良好的实用性与扩展性.     

基于蓝牙技术的家用视频监控系统的设计

本系统基于S3C2410芯片和嵌入式Linux操作系统,采用USB摄像头捕捉视频,经MPEG-4压缩,运用蓝牙技术与家用蓝牙手机实现了图像视频的传输,达到了实时监控的目的。     

基于北斗/GPS的集装箱监控终端

随着经济的发展,物流的安全性也日益重要.目前市场上的集装箱监控装置大多采用GPS＋GPRS的模式.北斗系统是我国自主研发的定位导航系统,同时具备定位和短报文的功能.在此基础上,提出一种拥有北斗/GPS组合定位、北斗短报文通信、手机蓝牙交互功能的集装箱监控终端.     

过采样和非线性校正在中子发生器控制台上的应用

在以往的中子发生器控制台中,由于AD采样精度低、驱动电路电子器件产生温漂、时漂,导致整体采样电路非线性误差大.针对上述问题,提出了使用过采样技术提高AD采集分辨率,同时利用最小二乘法线性回归对采样结果进行非线性校正.使用ARM-Cortex-M4为内核的S T M 32 F407作为主控芯片,使用过采样技术并结合电路特性进行非线性校正,将A D采集分辨率由12位提高到16位,采样数据采用最小二乘法拟合后,结果非线性误差为0.2％,符合中子发生器控制台精度要求.     

基于物联网的智能家居系统设计

在介绍当前智能家居系统的发展前景和主流的设计思想的基础上,分析了现今智能家居系统的优缺点。应用ARM平台开发智能家居监控系统,系统由监控系统主控制器、无线传输模块、蓝牙通信模块、Wi Fi模块以及GSM模块组成。以无线通信模块实现信息的监测与控制;蓝牙通信模块实现手机与控制器的局域网络控制;GSM模块实现短消息报警功能;Wi Fi模块将室内信息上传至网络服务器。     

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.     

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