基于单片机的LED点阵书写显示屏的设计

针对现有LED显示屏不能现场修改显示内容的缺点,设计了LED点阵书写显示屏的控制器,提出了一种新的控制方案：可手写输入修改显示内容,并实现＂点亮、划亮、反显、擦除、连写多字、对象拖移和整屏显示＂等书写显示功能.本系统由控制模块、点阵及驱动模块、光笔、液晶显示等组成.设计了硬件和软件,并制作了样机,试验调试结果表明,效果...     

双色8×8点阵LED的动态显示

双色8×8点阵LED矩阵发光屏采用逐行扫描方式驱动,以8031单片机为核心,MAX7219作为行、列驱动器,完成了双色8×8点阵LED矩阵发光屏驱动板设计与制作,实现了LED显示器件的动态驱动。通过对驱动波形的测试与分析,加深了学生对显示像素4种状态（全选点,行、列半选点和非选点）的理解。通过对该实验系统功能的扩展,可以强化学生平板显示器件驱动技术方面的训练。     

带串行口通信汉字点阵屏的研究与实现

文章介绍一种基于Intel8051单片机及其外围扩展系统组成的一个16×64LED汉字点阵屏系统.系统采用VB编写上位机程序,对字模进行提取、编码及转化,由PC机通过串行口发送子程序将点阵代码发送到下位机的EEPROM(62256)中,单片机通过驱动电路将汉字信息在点阵屏上显示出来.     

超高亮LED点阵信息显示系统的设计与实现

介绍一种超高亮LED点阵信息显示系统：选用超高亮LED构成点阵屏,采用静态显示方式,用锁存器驱动LED发光,提高显示亮度,在室外阳光下也有很好的显示效果．给出系统的电路图,介绍系统的工作原理、获取汉字点阵数据的方法以及PC机与点阵屏通信的方法．     

16×16点阵显示屏的设计

LED点阵显示屏作为一种新兴的显示器件,现已广泛应用于广告、交通运输、教育系统、银行等工业企业管理和其它公共场所,产业面临良好的市场发展机遇及前景。本设计是4个8×8点阵LED电子显示屏的设计。整机以STC公司生产的40脚单片机STC89C516为核心,通过该芯片控制两个行驱动器74HC164和两个列驱动器74HC595来驱动显示屏显示。该电子显示屏可以显示各种文字或单色图像,全屏能显示整个汉字,采用4块8×8点阵LED显示模块来组成1个16×16点阵显示模式。文中详细介绍了LED点阵显示的硬件设计思路、硬件电路各个部分的功能及原理、相应软件的程序设计以及使用说明等。     

可书写的机器人控制屏设计

设计是基于微处理器STM32作为主控,采用光敏三极管作为感应元件,基于74HC573、74HC138和MG4953作为双色点阵屏的行和列驱动。光笔以微亮的弱光作为输入信号,通过D/A和A/D电路转换处理,实现系统通过光笔实现对LED点阵屏的点亮、擦除、多字连写、对象的拖移等功能,以达到机器人控制面板更形象、直观和易操作等效果。     

基于PC机串口的LED汉字显示系统设计及实现

本设计是以PC机通过串口控制单片机89c52的LED点阵汉字显示系统。此系统采用PC机作为上位机,由89C52单片机完成接收并处理PC机串口发来的控制命令以及显示代码,通过显示驱动模块驱动4个8×8级联的LED点阵显示屏完成动态扫描显示,从而实现实时显示汉字的目的。     

模块化LED点阵显示屏实训系统设计

LED点阵由于其独特的显示效果在单片机教学中深受学生喜爱,8×8点阵模块可满足课程学习的需要但不适合单片机课程的实训教学。利用74HC138和74HC595芯片设计了一种可级联的16×16室内LED点阵模组,使用单片机作为控制芯片,将12个显示模组级联,搭建了一个32×96室内用LED显示屏实训系统并进行了显示效果实验。此系统模块化设计,可根据需要自由组合,搭建简易,学生可将主要精力集中在显示效果的程序实现中,也可满足不同系统中对LED显示的要求。     

基于AT89C52的光立方设计

该文研究了基于AT89C52的光立方设计,采用8片74HC573作为面驱动器件,1片ULN2803作为层驱动器件,驱动8×8×8LED点阵,可显示任意立体图形和3D动态效果。     

基于STC89C54RD+单片机的点阵LED显示屏的设计

以单片机系统组成的点阵LED显示屏开发过程.系统采用上-下位机的结构构建,上位机PC可通过串行通信接口实现对下位机LED显示系统显示参数的设定.下位机以LED屏的显示电路和单片机控制电路为核心,实现点阵LED屏以多样化的方式显示各种信息的功能,同时可实现本地温度采集、显示和本地时间实时显示的功能.     

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.     

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.     

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