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.
设L2ω(-1,1)是(-1,1)上加权Lebesgue可积函数空间,其中权函数ω=(1+x)12(1-x)-12.利用关于权函数ω(x)正交的Jacobi多项式,构造了一列多项式小波.空间L2ω(-1,1)被分解为小波函数空间的直和.相应的小波函数和尺度函数还具有某种插值性质.  相似文献   

2.
讨论了形如{minEf(x,ζ(ω)) s.t.x∈D 的随机规划的目标函数Ef(x,ξ(ω))的连续性。  相似文献   

3.
施变换y=zeαx于特征根为共轭复根α±iβ的常系数齐次线性微分方程y″+py′+qy=0和施变换y=zeλx于常系数非齐次线性微分方程y″+py′+qy=eλx[Pl(x)cosωx+Pn(x)sinωx]后,再设Z※=Q(x)cosωx+R(x)sinωx,解出齐次方程和导出非齐次方程的特解设置.  相似文献   

4.
若干类线性正算子的Λ_ω(A)类保持性质   总被引:2,自引:2,他引:2  
设ω(x)是区间I上的上凸连续模函数,记Λ_ω(A)={f∈C(I):ω(f,x)≤Aω(x)},文章得到了f∈Λ_ω(A)的充要条件是L_nf∈Λ_ω(A),其中L_n是相当广泛的若干类线性正算子.  相似文献   

5.
韩文法  韩可众 《河南科学》1994,12(4):288-293
对任何偶数2A,在下列任一条件下:(I)π>ω;(Ⅱ)π<ω(α)π>ω-σ (β)π=ω-σ;(Ⅲ)ω=π通过有限次的推导,均证明(1+1)是成立的。  相似文献   

6.
证明了方程x″+x+λarctanx′=p(t),x(0)=x(π)=0{非负解的存在性.  相似文献   

7.
一类拟线性第二边值问题的存在唯一性   总被引:1,自引:0,他引:1  
本文在f(t,x),fx(t,x),β(t)连续,fx(t,x)≥-β(t),β(t)≤π20+α24,β(t)π20+α24,π0为方程αsinx2+xcosx2=0的最小正根条件下,证明了第二边值问题.x"=αx+f(t,x),x(0)=a,x(1)=b对于任给实数α,a,b都有唯一解  相似文献   

8.
若干类线性正算子的∧ω(A)类保持性质   总被引:4,自引:0,他引:4  
设ω(x)是区间I上的上凸连续模函数,记∧ω(A)={f∈C(I):ω(f,x)≤Aω(x)},文章得到了f∈∧ω(A)的充要条件是Lnf∈∧ω(A),其中Ln是相当广泛的若干类线线性正算子。  相似文献   

9.
设n是偶数,Pn-1是Legendre多项式,Rn(f,x)是以(1-x^2)Pn’-‘1(x)的零点为基点的所谓(0,2)型插值多项式,本文构造了两个函数类Hω2,Hω1,研究了Rn(f,x)逼近Hω2,Hω1中函数f(x)的阶。  相似文献   

10.
本文在π/H是交换群的条件下,讨论了一般H不动点类的重要数据N(f,H)。特别是H^-∪→H时π/H即为交换群,所列结论全部成立。设X是紧致连通多面体,f:X→X是X上的自映射 x0∈X可设f(x0)=x0,f诱导出的基本群的同态,fπ:π1(X,x0)→π1(X,x0)简记π1(X,x0)为π。H∪→π为π的正规子群,且满足fπ(H)∪→H。π/H为商群,π中的元素用α记,π/H中的元素用α^-  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.
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   

14.
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   

15.
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   

16.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

17.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

18.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  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   

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