基于可编程芯片的图像实时中值滤波实现

介绍了利用高速可编程芯片FPGA/CPLD实现图像实时中值滤波的方法,探讨了芯片内部各功能模块单元的具体设计过程,并给出了EDA平台上的时序仿真波形.相对于一般的设计方法更为高效和便捷.     

基于FPGA的通用接口总线(GPIB)控制器的IP核设计

本文采用基于模块化思想对GPIB控制器IP核进行设计,采用VHDL语言编程实现.在EDA平台下进行功能分析并采用ALTERA公司ACEXIK系列芯片实现.结果证明采用此方法设计GPIB控制器能提高设计效率和正确性,降低成本.     

MIDI音乐发生器芯片的设计

基于EDA技术,以MaxplusⅡ为软件开发工具,采用VHDL语言,在Altera公司的大规模可编程逻辑器件(CPLD)上实现了MIDI音乐发生器芯片的设计.该芯片配上必要的外围电路,可以发出美妙的MIDI音乐.     

基于FPGA的直接数字频率合成器的设计

基于FPGA器件EP1K30QC208芯片,采用VHDL设计实现了一个相位、频率均可控制的数字频率合成器,并在ZY11EDA13BE试验系统中完成硬件测试。经实验验证,输出波形达到了技术要求,性能良好,控制方便,证明了基于FPGA的DDS设计的可靠性和可行性。     

并行CRC算法硬件实现研究与VHDL设计

介绍了循环冗余校验码(CRC)的生成算法,在分析讨论了几种常见CRC算法硬件实现的基础上,以VHDL给出了一种简单通用的CRC并行计算实现方法.该方法适用于各种不同的CRC生成多项式和各种不同的信息码宽度(如8位、16位、及32位等),经Altera公司的EDA开发工具软件QuartusII6.0编译、综合、优化、适配和仿真,得相关的时序仿真波形图、RTL图和占用硬件资源报告.分析各种数据报告可知设计意图得到了有效的贯彻.该设计最终还以杭州康芯公司GW48系列的SOPC/EDA实验开发系统所带的Cyclone系列中的EP1C12Q240C8芯片为硬件载体,经下载测试证实了设计的可靠性.     

基于CPLD和ISD2560芯片的语音报站系统设计

简述了ISD2560语音芯片和CPLD两种器件各自的特性.用CPLD作为ISD语音芯片的控制器,在EDA软件工具的支持下实现了公交车报站系统的设计.在分析语音芯片内部存储器结构的基础上,给出了语音段的划分和首地址的确定方法,为ISD语音芯片采用灵活的地址操作模式创造条件.系统将语音的录放集于一体,为使用者进行语音的录入和修改提供了方便.     

数字电路在EDA开发系统上的实现方法研究

目的 研究数字电路在EDA开发系统上的实现方法.方法 以数字钟设计为例,针对两款具体的CPLD/FPGA开发系统给出了不同的设计思路和实现方案.结果 下载/配置到实验板的目标器件上,经实际电路测试验证,达到了预期的设计要求.结论 基于EDA技术的数字电路开发方便、灵活、高效,成本低,上市周期短.     

可满足性求解方法在SoC验证和测试中的应用

介绍可满足性(SAT)求解方法在向量自动生成、符号模型检查和组合电路等价性检查等在电子设计自动化(Electronic Design automation,EDA)研究领域中的应用,阐述SoC芯片验证和测试采用可满足性(SAT)方法进行解决的原理.满足性(SAT)求解方法可有效地减少验证和测试所需时间,提高SoC芯片设计的效率和可靠性.     

基于FPGA的信号滤波系统设计与实现

探讨了信号滤波的FPGA实现过程,在芯片内部设计DDS信号发生器和FIR滤波器两大电路功能模块,并利用EDA工具软件中所附带的嵌入式逻辑分析()出了滤波前后信号实时监测结果.相比于一般实现方法更高效和快捷.     

(7×7)奇偶校验电路的EDA设计

介绍了常用的水平垂直冗余校验码——(7×7)奇偶校验编码解码逻辑电路的EDA设计,用VHDL语言对(7×7)奇偶校验编码器和解码器进行描述,用Quartus II软件进行仿真测试.从仿真结果看,电路完全符合要求,可以烧写成芯片.     

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