首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
本文在利用面向对象思想分析Estelle语言的基础上,提出了面向对象的协议半自动实现方法。在此方法指导下,以C++为中间语言,实现了Estelle转换为C++的编译器。本文介绍了Estelle-C++编码器的结构、特点及设计实现。  相似文献   

2.
本文讨论了TurboC同Foxbase~+实现数据共享的一个基本方法,即TurboC直接调用Foxbase~+数据库中的数据。  相似文献   

3.
讨论了新型萃取剂Lix984在氯化物体系中对Cu2+的萃取性能及革取分离Cu2+与Fe3+,Ni2+,Co2+,M2+,Zn2+等的最佳技术条件,并用Lix984实现了硫钴精矿焙砂浸出液中Cu2+与杂质离子的分离.  相似文献   

4.
本文讨论了XDPC++语言特性,XDPC++是支持类型完全和类型正交的对象持久性的C++,语言超集,本文还讨论了引入持久性对C++程序设计风格及安全性的影响。  相似文献   

5.
COC++ 编译器面向对象技术的实现   总被引:2,自引:1,他引:2  
COC++编译器的功能是将C++源程序转换为等价的C程序。COC++编译器不是使用传统的构造方法而是采用面向对象的设计技术,将相应成分如符号表,语法分析等模块封装为类,并以C++语言实现。符号表类封装符号表及其建立、登录、查找等操作。基于C++的作用域规则,COC++编译器为每个作用域中的符号建立一个符合表,利用指针链指明嵌套关系和继承关系。语法分析的模块设计为一个抽象类,定义所有语法成分类的公共特性和公共接口。实际的分析工作和语义处理工作通过C++语言的多态机制由相应的派生类各自的成员函数实现。这样类化的编译结构不会因为增加某些语言成分而做很大的改动。阐述了面向对象的技术用于编译系统的设计和开发的特点。  相似文献   

6.
分析总结了C ̄(++)的多态机制及其表现形式。给出了C ̄(++)虚函数的实现方法,以及实现的数据结构、虚函数表的实现方法和虚函数调用的翻译策略,讨论了虚函数实现技术的关键问题。  相似文献   

7.
用户界面线程是由进程创建的子线程,可用于处理用户事件和消息.本文阐述了在使用C++和MFC实现用户界面线程时应注意的几个问题和解决方法,并给出了相关部分的源程序.  相似文献   

8.
本文用完全对角化方法研究了3d3组态在MgTiO3:Cr3+晶体中的零场分裂参量D.结果表明:Cr3+(1)占位可以解释为Cr3+Mg-Ti4+Ti,同时Cr3+沿着C3轴远离向八面体中心移动0.05±0.01;Cr3+(2)占位为Cr3+Mg-Mg2+Ti,Cr3+向八面体中心移动0.09±0.01,这与前人用微扰公式得到的结果一致.本文同时还指出Cr3+(1)占位的另一种解释,即Mg2+Mg-Cr3+Ti,向八面体中心移动0.075±0.01  相似文献   

9.
本文对传统遗传算法进行改进基实施过程和操作方法,提出一种小群体并行育种的遗传算法,并在VC++4.2环境下编程实现,经对TSP问题CHN144实例的模拟实验,结果表明:该算法可望在相对短的时间内获得更好的近似最优解。  相似文献   

10.
C语言面向对象机制的底层实现   总被引:2,自引:0,他引:2  
本文在剖析实践的基础上,对面向对象语言C++中体现封装性,继承性,多态性的诸多机制的底层实现进行了探讨,其中重点讨论了类,对象,虚函数,单一继承,多重继承,虚基类,构造函数和析构造函数等在底层的实现方法和工作原理,力图从一个新的角度认识C++。  相似文献   

11.
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.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
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.  相似文献   

14.
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.  相似文献   

15.
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。  相似文献   

16.
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.  相似文献   

17.
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-  相似文献   

18.
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-  相似文献   

19.
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  相似文献   

20.
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号