基于USB的鼠标扫描系统设计与实现

提出了一种基于USB总线的光电鼠标电路和扫描电路相结合的新的设计思想，并介绍了具体的实现方法以及各个部分的电路和芯片选型，该系统通过USB总线和PC机相连，扫描和鼠标的结合也增加了该系统成为PC机标准配置设备的可能。     

基于SPCE061A单片机的USB通信应用

所设计的USB设备系统主要实现SPCE061A单片机与PC机之间的通信,应用于中低速外部设备,用以解决PC机外设端口的竞争和提高设备的传输速度.     

基于嵌入式和DS18B20的温度采集系统

利用MCU、温度传感器、Flash芯片和USB控制芯片设计一个基于嵌入式USBX机的温度采集系统．该系统能将采集到的温度数据存储在自己的Flash芯片中,能将数据通过USB接口存储到USB移动存储设备中,同时还能够作为PC机的一个外设,通过USB接口连接到PC机上,直接在PC软件上进行温度数据的分析和处理．重点论述了温度采集系统的设计与实现．     

基于USB的数据采集及其在线缆通断测试系统中的应用

单片机通过USB跟PC机进行通信,单片机对命令和数据进行处理,配以PC机的直观形象的界面,可以很好地解决一个实际中的应用问题。从而完成线缆与51单片机的接口电路设计和USB接口电路设计,同时完成相应的软件设计以及显示界面的设计。     

基于USB总线的设计与开发

本文介绍了一种比较简单方便设计USB设备的方法,设计采用51单片机和USB接口芯片组成的单片机最小系统来实现一个完整的USB设备。系统采用的控制器是51单片机AT89C51,USB电气接口则是PHILIPS公司的USB接口芯片PDIUSBD12。单片机控制器作为下位机,通过USB电气接口芯片和USB总线与PC机交换数据,并实现USB设备的逻辑功能。本文详细的阐述系统的硬件设计方案,包括由C51和PIDUSBD12芯片组成的USB基本功能模块,系统扩展功能模块的设计和实现方法;系统软件的具体实现,包括固件程序,系统驱动程序和应用程序的设计实现。本系统开发的最终硬件成果是一个带有USB接口的设备,通过USB电缆与PC机相连接,能够实现主机对设备的列举,以及和PC机交换数据,并实现其扩展功能。该系统简单结构简单、成本较低,具有很广泛USB、的通用性。     

基于USB接口的单总线温度采集系统的设计

将单总线与PC机USB连接,可实现比传统方式更经济、灵活的设计。介绍了由DS2490实现的PC机USB与单总线接口电路的硬件和软件设计,并分析了其在单总线分布式温度采集系统中的应用。     

嵌入式系统中USB Host功能的开发

采用自下向上的设计流程，在没有嵌入式操作系统支持的条件下，自主设计和实现了嵌入式USB Host功能．以ISP1362驱动USB海量存储类设备为例，描述了嵌入式USB Host系统的框架结构和底层驱动的设计方法．实验结果表明，遵从海量存储类子协议的USB设备，都能够被系统驱动，而且数据传输速度优于PC机驱动方式．     

采用USB-UART转换方式实现DSP与PC机的USB通信

介绍了异步串行通信芯片SC16C550和USB-UART转换芯片FT232BM的功能、结构特点和内部寄存器．在此基础上设计了通信系统的硬件电路，针对一类应用于运动控制的DSP系统的数据传输需求较低且数据流零散的特点．提出了一种采用LISB-UART转换方式实现该类DSP系统与PC机USB通信的方案．这种方案不但满足了LISB通信方便快捷的特点．而且继承了传统UART通信占用系统资源少、通信固件开发简单的优势．设计了通信系统程序流程图，选用ADSP-21992为目标DSP，介绍了其代码开发平台VisualDSP 3．5及其相关调试工具，并根据流程图简述了DSP内的程序代码组织结构和运行机制．最后说明了PC机上相关驱程的开发步骤和重要函数。     

基于DSP平台的USB接口设计及应用

USB作为一种新型的接口技术，以其简单易用、速度快等特点而备受关注．但由于USB接口协议复杂，且涉及到WINDOWS操作系统的响应问题，使得USB设备的开发较困难．该文介绍基于DSP的USB接口硬件设计、软件编程及应用，详细论述了USB的固件编程及应注意的问题，并给出USB接口在Mass Storage中的应用．经实际验证，PC机能够顺利的识别USB设备并通过USB接口与其进行数据的读写交换．随着DSP在数字信号处理上的广泛应用，USB接口将在DSP开发系统中具有广泛的应用价值．     

基于USB接口的数据采集系统

通用串行总线(USB)以其低成本、使用简单、扩展方便及支持即插即用设备等特点而得到了广泛应用。本文首先简单介绍了USB的体系结构和特点，然后从硬件和软件两个方面详细讨论了基于USB接口的数据采集系统的基本开发步骤，最后通过介绍一个微控制器数据采集系统利用D12与PC机进行通讯的实例进一步论述了整个USB数据采集系统的基本开发过程。     

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.     

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。     

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.     

《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