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1.
A tree decomposition of graph G=(V, E) is referred to as a partition of edge set E into edge-disjoint trees. Given (not necessarily distinct) vertices u-1, u-2...u-k∈V with k≥2, a sufficient and necessary condition is given for a connected graph G=(V,E) to have a tree decomposition {T-1, T-2...T-k} such that V(T-i)=V{u-i}, i=1,2,... k. 相似文献
2.
An allowable generalized quantum gate (introduced by Long, Liu and Wang) has the form of U = Σ
k=0
d−1
c
k
U
k
, where U
k’s are unitary operators on a Hilbert space H and |Σ
k=0
d−1
c
k
|⩽1 and |c
k
|⩽1 (0⩽k⩽d−1). In this work we consider a kind of AGQGs, called restricted allowable generalized quantum gates (RAGQGs), satisfying
0 < Σ
k=0
d−1|c
k
|⩽1. Some properties of the set RAGQG(H) of all RAGQGs on H are established. Especially, we prove that the extreme points of RAGQG(H) are exactly unitary operators on H and that B(H)=R
+
RAGQG(H). 相似文献
3.
XU Kuoxi HU Peizhi~ CAI Lihua College of Chemistry Molecular Sciences Wuhan University Wuhan Hubei China 《武汉大学学报:自然科学英文版》2006,11(3):682-686
0 IntroductionPayrriodminaetiics hoenteer oofc ythcleics m .os tC oambupnoduanndts a cnodn tbaeisntin kgno twhnepyridine ring are widely distributedin nature,principally asenzymes and alkaloids . Pyridine enzymes have been foundintissues of all plants and ani mals examined thus far ,andare derivedfromeither nicotinic acid or Vitamin B6[1].Pyr-idine derivatives are also the building block of many phar-maceuticals with a wide range of functionalities that includeantitubercular compounds ,antivi… 相似文献
4.
We study the spaces Hp, Sp, Kp, ∑p and ,p of martingales with measure du=ψdυ,where ψ is a function with Clifford algebra values and satisfies bp+-condition. We proved they are equivalent and isomorphic to the corresponding spaces of martingales with real measure dυ, respectively(1≤p<∞). In the end,we give a martingale f such that f=(fn) ∞∈1K∞ but f=(E(ψ| n)fn)n≥ ∈1K∞. 相似文献
5.
Let
(t)(t ∈ R
+
N
) be the d-dimensional N-parameter generalized Brownian sheet. We study the polar sets for
(t). It is proved that for any a ∈ R
d
, P{
(t) = a, for some t ∈ R
>
N
} =
and the probability that
(t) has k-multiple points is 1 or 0 according as whether 2kN > d(k − 1)β or 2kN < d(k−1)α. These results contain and extend the results of the Brownian sheet, where R
>
N
= (0,+∞)
N
,R
+
N
=[10,+∞)
N
,0< α≤1 and β≥1.
Biography: LI Huiqiong (1966–), female, Associate professor, research direction: stochastic process and random fractal. 相似文献
6.
WU Chuan-ju LIU Lu-qin 《武汉大学学报:自然科学英文版》2005,10(6):945-948
This paper considers a special class of operator self-similar processes Markov processes {X(t), t≥0} with independent self-similar components, that is, X ( t ) =(X^1(t),…,X^d(t)), where {X^i(t),t≥0}, i=1,2,…,d are d independent real valued self-similar Markov processes. By means of Brel-Cantelli lemma, we give two results about asymptotic property as t→∞ of sample paths for two special classes of Markov processes with independent self-similar components. 相似文献
7.
Suppose that A is an n × n positive definite Hemitain matrix. Let X and Y be n × p and n × q matrices (p+ q≤n), such that X* Y = 0. The following inequality is proved
X*AY( Y* AY)-Y Y*AX≤( (λ1-λn)/(λ1+λn))2 X*AX,
where λ1 and λn are respectively the largest and smallest eigenvalues of A, and M- stands for a generalized inverse of M. This inequality is an extension of the well-known Wielandt inequality in which both X and Y are vectors. The inequality is utilized to obtain some interesting inequalities about covari-ance matrix and various correlation coefficients including the canonical correlation, multiple and simple correlation. 相似文献
8.
Gan Shixin 《武汉大学学报:自然科学英文版》1997,2(1):13-18
In this paper we prove the following Hàjek-Rènyi inequality: Let 0≤p≤1, then for any Banach spaceB, anyL
p integrableB valued random variable sequence {D
n
, n≥1}, any real number sequence {b
n
, n≥1} with 0<b
n, ↑ ∞, any integern≥1, there exist a constantC=C
p>0 (only depending onp) such that
In the other direction, we prove some strong laws of large numbers and the integrability of the maximal functions forB valued random variable sequences by using this inequality and the Hàjeck-Rènyi inequality we have obtained recently. Some
known results are extended and improved.
Supported by the National Natural Science Foundation of China and the State Education Commission PH. D Station Foundation
Gan Shixin: born in Feb. 1939, Professor 相似文献
9.
In this paper, we prove an extrapolation theorem of operators in martingale spaces with A
p
weights, which shows that for operators T defined on martingale space L
u
1
, if T is bounded on martingale space L
p0(w) for some 1 < p
0 < ∞ and every, w∈ A
∞, so it is on L
p,s
(w) for every 1 < p, s < ∞, and w ∈ A
∞. We also get some properties of A
p
weights and prove that if w ∈ A
1, then the maximal operator M is bounded on L
p,q
(w) with 1 < p < ∞, 1 < q ≤ ∞. 相似文献
10.
Iodine-involved single-electron halogen bonds (SEXBs) weak interactions in the systems of CH3···I-Y(Y = BH2, H, CH3, CH==CH2, C≡CH, CN, NC) were investigated for the first time using B3LYP/6-311++G(d,p) and MP2/aug-cc-pVTZ computational levels (the relativistic effective core potential basis set of Lanl2dz was used on iodine atom). The interaction energies between two moieties with basis set super-position error corrections for the seven complexes are -0.57, -1.36, -3.80, -2.17, -4.49,-6.33 and -8.64 kJ mol-1 (MP2/aug-cc-pVTZ ), respectively, which shows that SEXBs interactions are all weak. Natural bond orbital theory analysis revealed that charges flow from CH3 to the I-Y moiety. The total amount of natural bond orbital charge transfer (ΔNC) from the CH3 radical to I-Y increases in the order CH3…IBH2 < CH3…IH ≈ CH3…ICH3 ≈ CH3···IC2H3 < CH3…ICCH< CH3…ICN< CH3…INC. Atoms-in-molecules theory was used to investigate the topological properties of the bond critical points in the seven SEXB structures. 相似文献
11.
WANG Yongjuan HAN Wenbao LI Shiqu 《武汉大学学报:自然科学英文版》2006,11(6):1862-1864
Rotation symmetric function was presented by Pieprzyk. The algebraic configuration of rotation symmetric(RotS) function is special. For a Rots n variables function f(x1, x2, …, xn) we have f(ρn^k (x1, x2, …xn))=f(x1, x2, …, xn) for k=0, 1, …, n-1. In this paper, useing probability method we find that when the parameters of RotS function is under circular translation of indices, its walsh spectrum is invariant. And we prove the result is both sufficient and necessary. 相似文献
12.
Fe+ ion beams with the energy of 110 keV were implanted into films of L(+)-cysteine (HSCH2CH(NH2)COOH). One of the single crystals grown in hydrochloric acid solution with the implanted samples through slow evaporation
was structurally characterized by the X-ray crystallography. The crystal is monoclinic, space group C2, with a = 1.8534(4) nm, b = 0.5234(1) nm, c = 0.7212(1) nm, β= 103.72°, V = 0.67965(3) nm3, Z = 4, F(000) = 144.0, D{clac} = 1.763 g · cm−3, μ(MoK
a = 1.06 mm−1, T = 293(2) K. R = 0.0379, wR = 0.0835 for 660 observed reflections (I > 2σ(I)). The structural formula of the crystal compound is (CH2CH(NH2)NO2)ClFe (M
r = 180.38 u). Products of heavy ion beam irradiation were purified and it was directly confirmed that the implanted Fe+ ions had been deposited in the novel molecules. The same doses of Fe+ ion beams of the same energy were implanted into films of L(+)-cysteine hydrochloride monohydrate. FTIR spectroscopy of the implanted samples proved that some of the original molecules
were seriously damaged and significant modifications were induced. 相似文献
13.
QIAO Jianping ZHU Axing WU Caiyan TIAN Hongling 《武汉大学学报:自然科学英文版》2006,11(4):761-766
Without taking inducing factors into consideration, this paper adopts a quantitative analysis of the bottom factors in the Three Gorges Reservoir area, studies the relationship between the bottom factors and the development of landslides, and then zones the area according to risk levels. The bottom factors adopted in this paper include lithological characters(U1 ), gradient(U2 ), slope form (U3), difference of helght(U4 ), and slope orientation(U5 ). In 4 650 km^2 of the studied area, the areas of the very high, high, medium and low hazard degree area respectively were 57. 94 km^2 , 2 305.15 km^2, 1 241.6 km^2, 1 045.31 km^2. The methodological steps are (1) inversion statistic analysis, (2) the analysis of contribution ratio and weighing, (3) getting results via fuzzy evaluation of risk levels. 相似文献
14.
15.
Let dμ=ϕdν be a complex valued measure where ν is a non-negative measure and ϕ is a complex valued function which satisfiesb
p
+
orb
∞
+
⊂a
1 condition. We prove some basic martingale inequalities such as B-G inequalities, weak (p, p) and strong (p, p) type inequalities for Banach space valued martingale with respect to complex measure μ.
Supported by the National Natural Science Foundation of China
Hou Youliang: born in 1956, Ph. D 相似文献
16.
Some weak asymptotic results for average σ-K width and average σ_L width of the isotropic Besov classes S r pθB(R d), S r pθb(R d) and the anisotropic Besov classes S r pθB(R d), S r pθb(R d) in L p(R d) (1≤p<∞) are obtained, and the corresponding weak asymptotic optimal subspaces are identified. Furthermore, the weak asymptotic behavior of optimal recovery is established for the isotropic Besov classes S r pθB(R d) in L p(R d) (1≤p≤∞). 相似文献
17.
WANG Chunxiang FEI Pusheng 《武汉大学学报:自然科学英文版》2007,12(3):417-420
This paper discusses the total irredundance relations between the graph G and its clone-contraction graph H, that is, let H be the clone-contraction graph of G and v1,v2,...,vk be all contraction vertices ofH. IfS is a maximal total irredundant set of H such that A = S ∩ {V1,V2,…,Vk} contains as few vertices as possible, then S'= S-A is the maximal total irredundant set of G. Furthermore, we obtain the bound of the total irredundance A(G) number: irt ≤△(G)/2△(G)+1 n, which n is the order of graph G, and △(G) is maximum degree in G. 相似文献
18.
Photocatalytic degradation of trace-level of MicrocystinLR by nano-film of titanium dioxide 总被引:1,自引:0,他引:1
FENG Xiaogang RONG Fei FU Degang YUAN Chunwei HU Yan 《科学通报(英文版)》2006,51(10):1191-1198
The occurrence of toxic water bloom of cyanobacte-ria algae, widely reported in eutrophic freshwater, hasbeen a serious pollution problem in recent years[1]. Mi-crocystins (MCs), the most common cyanobacteriatoxin with a cyclic heptapeptide structure (Fig… 相似文献
19.
A new method on constructing analytical potential energy functions is presented, and then a relatively universal analytical
potential energy function for precisely calculating the spectra of diatomic molecules and ions is derived. Furthermore, six
kinds of common potential energy curves containing three main potential curves i.e. steady state, metastable state and repulsive
state are obtained from this potential energy function. Finally, spectroscopic parameters of thirteen diatomic molecules and
ions including BeD-X
2
Σ
+, BeT-X
2
Σ
+ and Na2-X
1
Σ
g
+ etc are calculated by using the potential function, as a consequence, all calculation results are in good agreement with
experimental data.
Biography: YU Changfeng (1962–), male, Associate professor, research direction: theoretical physics. 相似文献
20.
The thermokinetic reduced extent equations of reversible inhibitions for Michaiels-Menten enzymatic reaction were deduced,
and then the criteria for distinguishing inhibition type was given and the methods for calculating kinetic parameters,K
M,K
i andv
m were suggested. This theory was applied to inverstigate the inhibited thermokinetics of laccase-catalyzed oxidation ofo-dihydroxybenzene bym-dihydroxybenzene. The experimental results show the inhibition belongs to reversible competitive type,K
M=6.224×10−3 mol·L−1,K
i=2.363×10−2 mol·L−1.
Xiong Ya: born Sep. 1961, Ph. D. graduate student. Curent research interest is in biothermochemistry research
Supported by the National Natural Science Foundation of China 相似文献