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 664 毫秒
1.
群作用下的分歧定理   总被引:1,自引:1,他引:0  
在紧致李群G作用下的Banach空间X中,利用等变严格集压缩场的零点指标公式,讨论了G等变映射f∈C1(X×R,X)在零点轨道N=G(x0)和管状邻域Ω上的分歧问题f(x,λ)=x-σ(x)-λA(σ(x))(x-σ(x))+R(x,λ)=0,所得结论推广了Rabinowitz的大范围分歧定理.其中σ:Ω→N是G等变投影,A(x0)是严格集压缩,R是高阶无穷小量.  相似文献   

2.
本文给出关于方程M(λ,X)=0的一个分歧定理,其中X是实Banach空间的一个元素,λ是N维参数,0)是Fredholm算子,dim,(B)=2,codimR(B)=N+1.作为该定理的应用,本文给出关于三点边值问题的分歧问题的两个结果.  相似文献   

3.
设f:E→F是Banach空间E的某个区域到同型空间F的Frchet可微的算子,A:F→E是一个相反的固定的线性算子.称迭代zn+1=zn-Af(zn)为简化Newton迭代,其中n∈N0,A=Df(z0)-1.用Канторович的区域判据和Smale的点估计判据研究广义简化Newton迭代的收敛性和收敛域的大小,并且包括当α(f,z)≤3-22时广义简化Newton迭代收敛情况.  相似文献   

4.
等变Sard—Smale定理   总被引:2,自引:2,他引:0  
在紧致李群G作用下的Banach空间X中,通过紧摄动方法和有限维逼近技巧,克服了现有结论对空间的光滑性限制和对映射的全连续限制,Sard-Smale定理被推广为一致等变形式。设f∈(C^1(X,X)是G-Fredholm映射,则对任意的ε〉0,都存在G等变全连续映射α∈C^1(X,X),使得f+α的零点轨道正则并且‖α‖〈ε。  相似文献   

5.
本文讨论非线性算子方程x+Ax=f,x∈D(A),f∈X,解的迭代逼近,其中X为UWP(b)型Banach空间,A:D(A)X→X为m-增生算子。  相似文献   

6.
算子双半群及其应用许跟起,王胜华(山西大学数学系)(上饶师专数学系)关键词Banach空间,算子双半群,应用BI-SEMIGROUPOFOPERATORSANDITSAPPLICATIONS¥XuGenqi;WangShenghua(Departme...  相似文献   

7.
设B与B′是两个实的Banach空间,f是B到B′的有界线性算子。X=(Xn,fn,n≥1)是一相邻极限鞅序列。本文研究了X在有界线性算子变换下f(X)=(f(Xn),fn,n≥1)这一相邻极限鞅的强大数定律,得到了若干有意义的结果。  相似文献   

8.
单调和耗散型非线性方程的迭代解   总被引:5,自引:4,他引:5  
设K是一致光滑Banach空间X的非空子集,T:K→K是Lipschitz单调映射.本文给出一个迭代序列强收敛到方程x+Tx=f的一个解,同时还给出一个涉及Lipschitz耗散算子A的非线性方程x-λAx=f的解的迭代逼近.  相似文献   

9.
设X是p-一致凸和一致光滑的Banach空间,T:D(T)→X是Lipschitz的m-耗散算子,其中T的定义域D(T)是X的闭真子集,研究了逼近非线性方程x-λTx=f,λ>0解的方法,扩展了几个已知的结果.  相似文献   

10.
考虑Banach空间X中的非线性微分程X'=A(t)x+f(t,x)在关于f的某些自然的条件下,利用Monch不动点定理证明了上述议程在给定闭凸集K包含于X中的周期解的存在性。  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.
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   

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.
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   

15.
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.  相似文献   

16.
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   

17.
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   

18.
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   

19.
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   

20.
Quality traits in wheat (Triticum aestirum L.) were studied by quantitative trait locus (QTL) analysis in a recombinant inbred line (RIL) population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross (ChSh). Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.  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