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1.
在求解线性方程组时通常采用矩阵的初等变换的方法,或当系数矩阵可逆时利用逆矩阵进行求解.讨论一种新的线性方程组的矩阵解法,即利用矩阵广义逆的理论求解线性方程组.分析满秩矩阵、弱逆矩阵定义,利用一个矩阵是另一个矩阵的弱逆阵的充要条件得出任意m×n矩阵必有弱逆阵且不唯一的结论,给出弱逆阵的求法,进而给出了线性方程组一种新的矩阵解法.  相似文献   

2.
从标准坐标变换方程出发,引入广义逆矩阵的求解方法,提出结构对初始条件的动力响应的一种新算法.这种算法回避开结构质量矩阵,以截断频率和对应的模态参数为输入,通过截断标准振型长方矩阵[Φ]的直接广义逆阵求解,求得结构对初始条件的动力响应.这一方法可用于已得到结构低阶模态参数而需进一步通过计算获得结构对初始条件的动力响应这一类工程中实际存在的问题.算例表明,精度满足工程要求.  相似文献   

3.
本文给出次-矩阵(次共轭转置、次Hermite、次规范及次值域Hermite矩阵)的若干广义逆性质。作为本文的重点我们讨论了下列四个问题:①怎样判定一个方阵B是否次值域Hermite矩阵;②次值域Hermite矩阵与值域Hermite矩阵的关系;③次值域Hermite阵的群逆是否一定存在的问题;④若次值域Hermite阵B的群逆存在,此群逆与相应的值域Hermite阵A的群逆的关系。  相似文献   

4.
由普通的逆矩阵推广到广义逆矩阵,进而研究广义逆矩阵的几类形式.在广义逆矩阵基础上,讨论了广义逆矩阵在线性方程组求解中的应用.  相似文献   

5.
利用块──Cayley-Hamilton定理得到一类各子块是两两可换的分块阵A的广义逆:加权Moore-Penrose逆、Moore-Penrose逆、Drazin逆及群逆的表达式和计算它们的块有限算法,本算法中需计算一个与给定矩阵的子块同阶的矩阵之逆阵.  相似文献   

6.
文[l]给出了循环矩阵非奇异的充分必要条件.本文给出了反循环矩阵非奇异的充分必要条件和逆阵表达式.同时.对奇异反循环矩阵给出了奇异{l}一逆,Moore-penrose广义逆及群逆表达式.  相似文献   

7.
引进了有广泛一般性的广义主正阵与广义完全正阵的概念,给出了这两类矩阵的基本的性质,得到了关于广义主正阵,广义完全正阵的逆阵,证明了关于它们非异主子阱的Schur补以及Sylvester矩阵、三角分解等方面的若干基本结果。  相似文献   

8.
完全模糊线性系统的模糊近似解   总被引:1,自引:0,他引:1  
对完全模糊线性系统A⊕x=b,当A为模糊方阵或模糊长方阵时进行了讨论.扩充了LR-模糊数的定义,讨论了完全模糊线性系统的模糊近似解和非负模糊近似解,并应用矩阵的广义逆阵A一,讨论了广义完全模糊线性系统的模糊近似解和非负模糊近似解.最后给出了具体算例.  相似文献   

9.
本文通过一种快速的广义预测控制算法避免了Diophantine方程的在线求解,并将复杂的大矩阵求逆问题简化为简单的对角阵求逆,大大减小了控制器的运算负荷,有利于广义预测控制在快速系统中的应用。  相似文献   

10.
求解首尾差循环矩阵逆与广义逆的快速算法   总被引:1,自引:0,他引:1  
提出首尾差循环矩阵的概念,利用多项式矩阵的初等变换理论给出了首尾差循环矩阵求逆阵及广义逆的一种快速算法。  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.
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.  相似文献   

18.
以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.  相似文献   

19.
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   

20.
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   

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