一般系统的yoyo结构及牛顿力学定律

介绍一般系统的yoyo结构.类似于欧式空间在当代科学中举足轻重的作用,该模型的引入使得系统科学的研究具有了自己独到的直观,方法体系及思维方式;为系统科学的进一步发展提供了方法保证.在论证了这个模型的成立与存在后, 该文利用这个模型研究了牛顿力学三定律的推广.本文结果说明了系统yoyo模型在自然科学研究中的有效性和实用性,所得到的4个物质运动状态定律可以相当自然地应用于社会科学方面的研究.     

一类部分均衡不完全区组设计的构造

区组设计与复数旋转码是互相促进的,受文献[1]的启发,寻找部分均衡不完全区组设计PBIBD的简单构造.从复数旋转码的编码原理出发,给出了构造GF(p)及GF(pe)上的一类PBIBD的简单而实用的算法,从而在一定基础上推广了复数旋转码及提高了它的编码速度.     

改进单元对联肢剪力墙的有限元计算

Allman构造有旋转自由度的三角形单元解决了一维单元与二维单元的连接问题,并且提高了同类单元的计算精度。文献[1]与文献[2]在这方面对该单元进行了改进,使之更利于对弯矩传递的计算。本文通过算例说明构造的带旋转自由度的墙板单元是准确可行的,建立的钢筋混凝土联肢剪力墙模型能正确反映其在单向荷载下的变形全过程。     

一类部分均衡不完全区组设计的构造

区组设计与复数旋转码是互相促进的,受文献[1]的启发,寻找部分均衡不完全区组设计PBIBD的简单构造。从复数旋转码的编码原理出发,给出了构造GF（p）及GF（P^*）上的一类PBIBD的简单而实用的算法,从而在一定基础上推广复数旋转码及提高了它的编码速度。     

一类非线性三阶、四阶系统李雅普诺夫函数的构造及类比法

<正> §1 前言R.Reissig,G.Sansone,R.Conti 三人合著的书《高阶非线性微分方程》总结归纳了大量文献对三阶四阶系统的研究成果。文献[2][3][4]用类比法构造三阶非线性系统的 Liapunov 函数,获得成功,从而扩充改进了[1]中对三阶系统的成果。文[5]扩充了[1]中对四阶系统的成果。本文的工作:     

带有未建模动态的一类非线性系统的鲁棒自适应控制

本文针对一类带有未建模动态的非线性系统,在文献[1]的基础上设计了一种鲁棒自适应算法,并在理论上证明了系统的稳定性,利用这种算法,只要适当选择设计参数,可以使输出均方误差任意小.本文参考文献[1]的方法,弥补了文献[2]没有考虑未建模动态的不足,并将文献[1]的方法扩展到了更为广泛的一类非线性系统.     

灰色控制系统

文献[1]提出了灰色系统(Grey System)的概念.本文进而研究灰色参数、灰色矩阵和灰色系统的一些基本特性,提出了灰色参数通道堵塞定理.在文献[1]、[2]的基础上,重新论述了状态矩阵为灰色实对称、灰色三角和灰色梳形系统的稳定问题;并以位移算子为基础,论述了白色映射及有关定理.     

结合旋转求包含多边形的最小正三角形

文[1]对寻找包含平面多边形的最小正三角形问题提出了一种基于遗传算法的求解方法,用此求解方法所求的最小正三角形必须有一边平行于x轴.本文将所给多边形进行旋转,在不同旋转角度下应用遗传算法求一边平行于x轴且包含相应多边形的最小正三角形.比较不同旋转角度下的结果,就可以得出比文[1]更好的选择.本文还以实例验证了以上思路是正确的.     

旋转火箭在光滑膛内的运动规律

本文通过对旋转火箭在光滑定向器内运动情况的全面分析,考虑到弹、炮之间由于间隙的存在,可能会出现“断续接触”的现象,从而抛弃了文献[3]中“前、后定心部连续接触管壁”的基本假设,提出了膛内运动的分段解法,并利用所建立的“分段”模型对某弹的膛内运动姿态进行了计算机模拟,其结果与文献[1]的实验比较符合。     

旋转编码器测试系统设计

该文在对旋转编码器工作原理研究基础上,提出一种基于单片机的旋转编码器测试系统,该系统具有成本低、效率高等特点,该文在对旋转编码器的工作原理和分类进行研究的基础上,针对基于单片机的旋转编码器测试系统展开了设计,该系统主要由单片机控制子系统、电源供电子系统、液晶显示子系统、外部接口、控制按键等组成.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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