共查询到20条相似文献,搜索用时 31 毫秒
1.
DU Nailin School of Mathematics Statistics Wuhan University Wuhan Hubei China 《武汉大学学报:自然科学英文版》2006,11(3):486-492
0 IntroductionLeqtuiliHnebaer afo rHimlbaenrtd sap baoceun.dLeedtlianaenardfufnbceti oan baolu onndeHd ,serse--spectively. Our goal is to seekv∈Hsuchthata(u,v) =f(u) , u∈ H (1)As a rule, we call the expression (1) a variational equationandva solutiontothis equation.By virtue of the Riesz repre-sentationtheorem,there exists a uniquely determined boundedlinear operatorA:H→Hsuchthata(u,v) =〈u,Av〉, u,v∈ H,where〈·,·〉is the inner product onH.If the sesquilinearformais also with posit… 相似文献
2.
Some limit theorems for weighted sums of random variable fields 总被引:1,自引:0,他引:1
GAN Shixin~ CHEN Pingyan~ . School of Mathematics Statistics Wuhan University Wuhan Hubei China . Department of Mathematics Jinan University Guangzhou Guangdong China 《武汉大学学报:自然科学英文版》2006,11(2):323-327
1Preliminaries DuringthelastyearsthereappearedquiteafewpapersaboutlimittheoremsforBanachspacevaluedrandomvariables(r.v.’s)withmultidimensionalindex.Itistheaim ofthispapertogivecomparativeweakconditionswhichimply limittheoremsforweightedsumsofBanachspacevaluedr.v.fields.Thecurrentworkextendsthecorrespondingresultsof Refs.[15].Westartwithsomenotationsanddefinitions.LetNdbe thesetofalld dimensionallatticeofpointswithpositiveinte gersascomponents,whered≥1isafixedinteger.LetNdbe equippedwithco… 相似文献
3.
It is well known that, the singular integral operatorS defined as:
ifL is a closed smooth contour in the complex plane C, thenS is a bounded linear operator fromH
μ(L) intoH
μ(L): ifL is an open smooth curve, thenS is just a linear operator fromH
* intoH
*. In this paper, we define a Banach space
, and prove that
is a bounded linear operator, then verify the boundedness of other kinds of singular integral operators.
Supported by the National Science Foundation of China
Wang Xiaolin: born in Aug. 1950, Professor 相似文献
4.
In this paper, the oxidative degradation of 2, 4-dichlorophenoxyacetic acid (2, 4-D) using Mn2+/H2O2 reagent under UV irradiation was studied. The results show that 2, 4-D was degraded more completely in Mn2+/H2O2 solution than traditional Fenton solutions. The effects of the concentration of Mn2+, H2O2 and pH were also investigated. And under the optimal condition of 1.48×10−4 mol/L, 8.99×10−5 mol/L and pH 3.38, the formation of ·OH was the most, both the decomposition rate of H2O2 and the degradation rate of 2, 4-D were the fastest. In addition, the photoreaction process was monitored using spin-trapping
electron paramagnetic resonance (EPR), and the results indicated that the oxidative process was predominated mainly by the
hydroxyl radical (·OH) gennerated in the system.
Biography: HUANG Yingping (1964–), Professor, Ph. D., research direction: pollution ecology and water pollution control. 相似文献
5.
Several kinds of Tungstophosphates of Heteropoly Compounds (TPHC) with different compositions and the same structure were
synthesized using the method of solid-phase reaction to change the mol ratio of Na4P2O7 · 10H2O, WO3 and Na2WO4 · 2H2O. TPHC, as a catalyst, was used in oxidative desulfurization of diesel. The results show that TPHC has catalytic activity.
With THPC existing, the highest desulfurization rate reaches 51.85%, 32.6% higher than that yield without TPHC. And the desulfurization
rate increases with decreasing WO3. FT-IR spectra of TPHC shows that the catalytic activity is related to the activity of end oxygen(Od).The more active Od is, the stronger the capability of obtaining or losing electron is. It means that TPHC has a good catalytic activity. FT-IR
spectra of TPHC indicates that desulfurization rate is in linear correlation with ( is intensity of W-Od vibration band, is intensity of P-Oa vibration band) and correlation coefficient reaches 0.965.
Biography: BIN Xiaobei (1965–), female, Ph.D. candidate, Associate professor, research direction: environment science and environmental
materials. 相似文献
6.
Li Liang-chao Ni Cai-hua Lin Qiu-yueDepartment of Chemistry Insititute of Physical Chemistry Zhejiang Normal University Jinhua Zhejiang China Department of Chemistry Jingzhou Normal College Jingzhou Hubei China 《武汉大学学报:自然科学英文版》2003,8(2):451-454
A mathematical model formulated as ΔfHθm(g)=a+sum from i=1 to 5bipi(i≠2) was constructed for the relationshipbetween standard formation enthalpy ΔfHθm(g) and path index Pi of substituted benzenes derivatives. An empiric equation for the calculation of ΔfHθm(g) was worked out. The calculated values of standard formation enthalpy based on this model are excellently consistent with those from experimental for 55 organic compounds. The model is shown to be simple and of practical usefulness, particularly when required experimental data are unavailable. 相似文献
7.
Shixin Gan 《武汉大学学报:自然科学英文版》2009,14(1):6-10
In this paper some new results of strong stability of linear forms in φ-mixing random variables are given. It is mainly proved that for a sequence of φ-mixing random variables {x
n
, n ⩾ 1} and two sequences of positive numbers {a
n
, n ⩾ 1} and {b
n
, n ⩾ 1} there exist d
n
∈ R, n = 1,2,L, such that a.s. under some suitable conditions. The results extend and improve the corresponding theorems for independent identically
distributed random variables.
Foundation item: Supported by the National Natural Science Foundation of China(10671149) 相似文献
8.
Che Ka-jia Li Zhi-chen College of Management Huazhong University of Science Technology Wuhan Hubei China 《武汉大学学报:自然科学英文版》2004,9(2):149-152
0 IntroductionIntheprocessofR&Ditem ,thereisusuallycompetition .ManyfirmswanttoinvestR&Dtoobtainapatent.Lury[1 ] gaveanequilibriuminvestmentundertheconditionofone timeinvestmentandcontinuousinvestmentwhenthepayoffwasafixedprize.Ref.[2 ]analyzedtheeffectofinformationsharinginR&D .TherearemanyliteraturesaboutanalysisofR&DlevelswhenfirmscompeteinoutputmarketafterR&Dsucceeds[3 ,4] .Additionally ,todecideinvestmentlevel,therearemanyliteraturesaboutR&Ditem’spricing .MondherBellalah[5] ,K .… 相似文献
9.
Peng Zhigang 《武汉大学学报:自然科学英文版》1997,2(2):139-141
We proved ifk(z)∈H
q (q≥1),g(z) is analytic on |z|=1,
, thenk′(z)∈H
1, especially, ifq=1, thenk(z) is an analytic function on the closed unit disk |z|≤1.
Peng Zhigang: born in June 1970, Ph. D 相似文献
10.
For double arrays of constants {a
ni, 1≤i≤k
n, n≥1} and NA r.v. 's {X
n, n≥1}, conditions for almost sure convergence of
are given. Both casesk
n ↑ ∞ andk
n=∞ are treated. A Marcinkiewicz-type theorem for i. d. NA sequences is obtained as a special case.
Supported by the National Natural Science Foundation of China
Cheng Riyan: born in 1968, MS student 相似文献
11.
For double arrays of constants {a
ni, 1≤i≤k
n, n≥1} and NA r.v. 's {X
n, n≥1}, conditions for almost sure convergence of
are given. Both casesk
n ↑ ∞ andk
n=∞ are treated. A Marcinkiewicz-type theorem for i. d. NA sequences is obtained as a special case.
Supported by the National Natural Science Foundation of China
Cheng Riyan: born in 1968, MS student 相似文献
12.
SU Xiaofang ZHANG Yiping 《武汉大学学报:自然科学英文版》2007,12(3):395-401
We consider the Poisson integral u = P*μ on the half-space R+^N+1 ( N 〉 1 ) (or on the unit ball of the complex plane) of some singular measureμ. If μ is an s-measure (0 〈 s 〈 N), then some sharp estimates of the integration of the harmonic function u near the boundary are given. In particular, we show that fpr p〉1,∫R^Nu^p(x,y)dx- y^-τ (y〉0,τ =(N-s)(p-1) ) (Given for p〉1, RN f 〉 0 and g 〉 0, " f-g " will mean that there exist constants C1 and C2, such that C1f ≤ g ≤ CEf ). 相似文献
13.
Nano-solid-base catalyst K2O/γ-Al2O3 was prepared and adopted for the synthesis of biodiesel by transesterification of rapeseed oil with methanol. The particle
diameter of the catalyst was about 50 nm, which was measured by transmission electron microscopy (TEM). The variables affecting
the yield of biodiesel during transesterification, such as mass ratio of KNO3 to γ-Al2O3, calcination temperature, calcination time, and catalyst content, molar ratio of methanol to oil, reaction temperature and
reaction time were investigated. The catalyst obtained by calcining a mixture of KNO3 and γ-Al2O3
at 600 °C for 3 h, was found to be the optimum one, which gave the highest catalytic activity in reaction. With 3% (m
catalyst/m
oil) catalyst, when the transesterification carried out at a molar ratio of methanol to oil 12:1, a reaction temperature of 70
°C, and a reaction time of 3 h, yield of 94% was achieved.
Foundation item: Supported by the National High-Technology Research and Development Program of China (863 Program) (2007AA100703) 相似文献
14.
Gan Shi-xin 《武汉大学学报:自然科学英文版》2002,7(1):14-19
For weighted sums of the form
where {a
nj
, 1 ⩽j⩽k
n
↑∞,n⩾1} is a real constant array and {X
aj
, 1≤j≤k
n, n≥1} is a rowwise independent, zero mean, random element array in a real separable Banach space of typep, we establishL
r
convergence theorem and a general weak law of large numbers respectively, conversely, we characterize Banach spaces of typep in terms of convergence inr-th mean and probability for such weighted sums.
Foundation item: Supported by the National Natural Science Foundation of China (No. 10071058)
Biography: Gan Shi-xin (1939-), male, Professor, research direction: martingale theory, probability limiting theory and Banach
space geometry theory. 相似文献
15.
LetX be a complex quasi-Banach space and Φ:[0,∞)→[0,∞) an increasing convex function with Φ(0)=0,
and Φ∈Δ2. ThenL
Φ
*
(X) is a quasi-Banach space with continuous quasi-norm andL
Φ
*
(X) has the ARNP if and only ifX does.
Supported by the National Natural Science Foundation of China
Liu Peide: born in 1943, Professor 相似文献
16.
Let {(D
n, FFFn),n/->1} be a sequence of martingale differences and {a
ni, 1≤i≤n,n≥1} be an array of real constants. Almost sure convergence for the row sums
are discussed. We also discuss complete convergence for the moving average processes underB-valued martingale differences assumption.
Foundation item: Supported by the National Natural Science Foundation of China and the Doctoral Programme Foundation of China
Biography: DENG Ai-jiao (1974-), female, Ph.D. candidate. Research interest is in stochastic processes and random fractal. 相似文献
17.
Zhong Li 《科学通报(英文版)》1997,42(24):2025-2025
The boundary value problem for harmonic maps of the Poincare disc is discussed. The emphasis is on the non-smoothness of the given boundary values in the problem. Let T . be a subspace of the universal Teichmüller space, defined as a set of normalized quasisymmetric homeomorphisms h of the unit circle S onto itself where h admits a quasiconformal extension to the unit disc D with a complex dilatation μ satisfying
where ρ(z)|dz|2 is the Poincare metric of D. Let B . be a Banach space consisting of holomorphic quadratic differentials φ in D with norms
It is shown that for any given quasisymmetric homeomorphism h : S1→S1∈ T . , there is a unique quasiconformal harmonic map of D with respect to the Poincare metric whose boundary corresponding is h and the Hopf differential of such a harmonic map belongs to B . 相似文献
18.
Thermogravimetry was used to study the non-isothermal decomposition kinetics and the stability of porphyrin copper-sodium
from ephedra. The kinetic equation for the second step can be expressed as
. The kinetic compensation effect is found to be: InA=0. 2468E
a
−8. 0513.Ea is 206. 61 kJ/mol. The results show that porphyrin copper-sodium has a high activation energy and good stability.
Biography: Zhang Lian-ru(1964), female, lecturer Research direction, applied biochemistry. 相似文献
19.
YANG Qinqin~ FAN Yun~ . School of Mathematics Statistics Wuhan University Wuhan Hubei China . School of Mathematics Statistics Central China Normal University Wuhan Hubei China 《武汉大学学报:自然科学英文版》2006,11(3):469-472
0 IntroductionLeRte(f K.[,1]O), ,ki) .e b.e, aOips- am ocdoumlaplre tseys dtiesmcre(tese eva lCuhatpito .nII Iri nignwith unique maxi mal idealJ(O) suchthatJ(O) =(π)forπ∈O,Kis the quotient field ofOcharacteristic 0 ,andkis theresidue fieldO/(π)of characteristicp, wherepis a fixedpri me number .Inthis paper , we fix a finite groupG,andletKcontains all the |G|-throots of unity,where |G|is the or-der of finite groupG.In particular bothKandkare splittingfields of every subgroup ofG.D… 相似文献
20.
LI Guoliang~ GAO Qibing~ LIU Luqin~ . School of Mathematics Statistics Wuhan University Wuhan Hubei China . Department of Statistics Finance University of Science Technology of China Hefei Anhui China 《武汉大学学报:自然科学英文版》2006,11(2):328-332
0Introduction Considerthemodel:y=h(x′β)+e wherey=y(1)y(q),h(t)=h(1)(t)h(q)(t),e=e(1)e(q),h(i),i=1,2,…,qisaknownboundedinjection:Rq→R1,h′isapositive matrixwith h(i)(t)tjasits(i,j)elementj=1,2,…,q,t=(t1,t2,…,tq),thepartialderivativesof2thorderofhexistandcontinuous.eistherandomerror.βisthep×1unknowparameterandxiisthefixedknownp×qmatrix,i=1,…,n,η=x′βiscalledpredictor,andthismodeliscalledgeneralizedlinearmodel.Supposetheindependentobservationsy1,…,ynaregetfromq dimensionrespons… 相似文献