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1.
给出双向正交的加细函数及其对应双向小波的构造方法.具体地,如果一个加细函数的面具mo(z)满足|mo(z)|^2+|mo(-z)|^2≤1.则可以应用该面具构造一类双向9-交加细函数.更进一步,给出构造相应的双向正交的小波的显式公式.最后给出构造算例.  相似文献   

2.
丁宣浩  杨美香 《广西科学》2005,12(3):172-173,176
设尺度函数φ(x)∈V0生成L2(R)的一个多分辨分析{Vj},W0+V0=V1,小波Ψ∈W0,两尺度关系是(x)=∑kpk(2x-k),Ψ(x)=∑kqk(2x-k),傅立叶变换式为^(ω)=P(z)^(ω2),^Ψ(ω)=Q(z)^(ω2),z=e-iω/2,两尺度矩阵为M(z)=P(z)P(-z)Q(z)Q(-z).{Ψ(x-k)k∈Z}为W0的标准正交基的充要条件是对几乎所有的z∈T两尺度矩阵M(z)为酉矩阵.  相似文献   

3.
考虑二阶线性微分方程f" + (e^p1^(x) + e^p2^(x) + Q(z))f = 0,这里 P1(z) = t1(z) +…, P2 (z) = t2 (z) +…是非常数多项式,Q(z)是一个阶小于n的整函数.Bank,Laine和langley研究了Q是多项式,t2/t1非实数和负实数情形,Ishizaki and Tohge研究了t2=t1,t2/t1非实数或t2/t1〈1/2情形.该文研究Q(z)是一个阶小于n的整函数且1/2〈t2/t1〈3/4的情形.  相似文献   

4.
一类带调和势Schroedinger方程组解的爆破   总被引:8,自引:8,他引:0  
研究了一类带调和势Schroedinger方程组的初值问题{iФt r△Ф m|x|^2Ф|ψ|^2=a(j 1)|Ф|^j-1|ψ|^k 1Ф,iψt q△ψ n|x|^2ψ|Ф|^2=b(k 1)|ψ|^k-1|Ф|^j 1ψ,Ф(0,x)=Ф0(x),ψ(0,x)=Ф0(x),得出了该初值问题的解在有限时间内的爆破.  相似文献   

5.
设p≥2(h-1),λ∈X^ 是p^2室中的正则支配权,证明了主Uψ模Mψ(λ^-0+Pλ^1)的形式特征标公式:描述了ψ(λ^-0+Pλ^1)的合成因子的分布状态,于A2型量子群,给出了p^2室一般位置室吉Uψ模范畴主Uψ模ψ(λ^-0+Pλ^1)合成因子的分解模式。  相似文献   

6.
合成了以二氰胺(N(CN)2)为配体的镧系金属配位聚合物{[Gd(dca)2(phen)2(H2O)3]^+[dca]^-[phen])m(dca=N(CN)2,phen=1,10-菲咯啉).用x射线衍射单晶分析法测定了配合物的结构,晶体为单斜晶系,属于P2。/c晶群,晶胞参数为a=14.2380(11),b=16.4961(12).c=17.1927(13),晶胞数为Z=4.氢键既形成了配位聚合物的3D网络结构,又为相邻Gd金属离子之间提供了磁超交换通道,变温磁化率显示配合物为弱的反铁磁交换作用并符合外斯定律,其中外斯常数θ=-2.37K.  相似文献   

7.
林家勇 《科技信息》2009,(24):88-89
本文采用密度泛函理论(DFT)的B3LYP方法,在6-31G(d)水平上对BmNn(m+n≤5)团簇及其阳离子的几何构型、电子结构进行了理论研究,结果表明:BmNn(m+n≤5)团簇的基态构型中,BN、B2N、B3N、B2N3,和B3N2均为线形结构,其余均为平面结构;BMNN^+(m+n≤5)团簇的基态构型中,BN^+、B2N2^+、BN3^+,B2N3^+、和B4N^+均为线形结构,其余均为平面结构。  相似文献   

8.
运用能量方法证明了如下非线性Schroedinger方程组Cauchy问题 {iut=Δu+|v|^2u,x∈R^n,t〉0,ivt=Δv+|u|^2v,x∈R^n,t〉0,u(x,0)=φ(x),v(x,0)=ψ(x) 存在有限时间T,使得当t→T^-时‖grad u(t)‖L^2(R^n)+‖grad v(t)‖L^2(R^n)=+∞.  相似文献   

9.
当丢番图方程ax^2+by^2+cz^2+dxy+exz+fyz=gw^2有整数解x0,y0,z0,ω0(ω0≠0),(x0,y0,z0, ω0)=1时给出它满足(x,y,z,ω)=1,ω≠0的全部整数解的公式:{x=ηx-ξm/t,y=ηy0-ξn/t,z=ηz0-ξp/t,ω=ηω0/t其中η=am^2+bn^2+cp^2+dmn+emp+fnp,ξ=2(ax0m+by0n+cz0p)+d(nx0+my0)+e(px0+mz0)+f(py0+nz0),(m,n,p)=l并利用所得结果证明几个推论.  相似文献   

10.
h(G,x)表示图G的伴随多项式,它从图G的补图出发研究色惟一和色等价.若P(G,λ):P(H,λ),称G和H色等价,一个图被称为是色惟一的,如P(G,λ)=P(H,λ)意味着G≈H.若h(G,x):h(H,x),称G和H伴随等价;G和H色等价当且仅当G^-和H^-伴随等价;G色惟一当且仅当G^-伴随惟一.Un表示从路Pn-4的每个1度点分别引出两个悬挂边所得到的具有两个3度点4个1度点的树.K4^-表示从K4中删去一条边得到的图.应用伴随多项式理论研究了图(UnUK4^-)^-的伴随多项式系数和根的性质,以此为基础刻画了图(UnUK4^-)^-的色等价图类。  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   

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