一种CMOS-CC4015的串联型步进控制器的设计

为简单化串联型顺序控制电路的结构,提出了一种以CMOS-CC4015移位寄存器为核心的串联型步进控制器的设计思路。该控制器用移位寄存器中各位的状态描述装备的工作步,用现场提供的控制信号(转移条件)作为移位寄存器的移位触发信号,在输入/输出电路的共同作用下实现顺序移位控制。实际应用表明,该控制器具有性能稳定、工作可靠、能耗小、连接简单、免编程等特点。在单机自动化设备的控制中,是一种值得推广应用的低成本控制器。     

硬件描述语言在专用集成电路设计中的应用

介绍了硬件描述语言ＶＨＤＬ的特点，讨论了ＶＨＤＬ语言与计算机高级语言的区别及寄存器ＰＴＬ描述方式的限制，阐述了在可编程ＡＳＩＣ设计吵降低目标器件硬件资源占用率的技巧及方法。     

基于可编程逻辑器件的二维卷积器IP设计

提出了一种图像处理用二维卷积器的IP设计．该卷积器的设计基于将一帧完整的图像分解为多个相互重叠的垂直窄带，而将每个垂直带视为一幅完整图像进行处理，因此大大减少了系统所用移位寄存器的数目，但系统的性能下降较少．用Verilog HDL语言描述了整个系统的设计，并在Xilinx公司的ISE4．1集成开发环境下进行了仿真和逻辑综合，给出了实现的结果．     

GAL器件输出逻辑宏单元的通用等效电路

建立了ＧＡＬ器件的输出逻辑宏单元ＯＬＭＣ（ｎ）分别在组态１、组态２及组态３的通用等效电路．它们适用于ＧＡＬ器件中任何一个宏单元；并且各宏单元不仅可以处于相同的组态，而且可以处于同一模式中不同的组态     

移位寄存器在实验中的应用

移位寄存器是用来寄存二进制数字信息,并能将存储的信息移位的时序逻辑电路。在数字通信中移位寄存器应用极其广泛。该文通过具体电路分析了利用移位寄存器等集成器件构成的实际电路,阐明了在实验中所能达到的教学目的。     

由m序列生成非线性序列的C语言实现

对m序列线性移位寄存器的状态图进行状态重组可以得到一类非线性移位寄存器的状态图,从而获得一类非线性伪随机序列。本文首先将生成非线性伪随机序列的条件演绎成严谨的数学语言,然后将移位寄存器的状态表看成二维数组,给出了在C语言环境下生成m序列并进行状态重组生成非线性伪随机序列的编程方法,用这种方法可以生成大量的非线性伪随机序列。     

通用阵列逻辑GAL器编程方法的研究

介绍了通用阵列逻辑ＧＡＬ器件的输出逻辑宏单元结构及组态模式，重点就ＧＡＬ器件编程中选择输出方式，合理分配引脚处理相邻性问题，选择逻辑问题的描述方式以及ＡＢＥＬ软件编辑中的几个技术问题进行了分析与探讨。     

多晶硅发射极超高速ECL移位寄存器的设计

报道了６００门和８００门两种ＥＣＬ超高速移位寄存器；介绍了多晶硅发射极双极晶体管的结构和有关先进工艺，包括深槽隔离、多晶硅发射极、钴硅化物接触和浅结薄基区等；使用这种多晶硅发射极晶体管，３μｍ特征尺寸设计的１９级环形振荡器的平均门延迟小于５０ｐｓ。给出了６００门移位寄存器的电路设计和版图设计，讨论了互连线和双层金属布线对６００门和８００门移位寄存器的最高工作频率的影响。     

基于CMOS图像传感器IBIS5-A-1300的时序设计

在分析CYPRESS公司的IBIS5-A-1300 CMOS时序的基础上,设计了串行、并行两种配置寄存器的模式,完成了多斜率积分、开窗口、亚采样功能.选用复杂可编程器件（CPLD）作为硬件设计载体,使用VHDL语言对驱动时序发生器进行了硬件描述.采用QuartusⅡ5.0软件对所做的设计进行了功能仿真,针对ALTERA公司的CPLD器件MAXⅡEPM570T144C3进行适配.系统测试结果表明,所设计的驱动时序发生器满足CMOS相机驱动要求.     

基于FPGA的键盘给定式双路直流稳压电源设计

讨论了一种基于FPGA的直流稳压电源的基本结构和设计方法。给出了FPGA器件实现的各功能模块的关系和作用，对重要的功能模块给出了较详细的VHDL语言描述。该电源具有易调节，高可靠性，高精度等特点：     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

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