图的平均距离的一点注记

给出了完全二分图Km,n,Km^-∨Pn,Km^-∨Cn的平均距离的计算公式。     

单圈图及其与完全图联图的全染色

研究单圈Cn’,一类单圈图G以及它们与完全图Km联图Cn’∨Kn,G∨Kn的全染色问题.借助于已知的完全图全染色的相关引理以及归纳总结的方法得出了Cn’,G的全色数以及其与完全图联图Cn’∨Kn,G∨Kn的全色数,从而验证了对这类图全染色猜想的正确性.     

特殊图的平均距离

设G=G1(×)G2是G1和G2的强乘积,算出了图Pm(×)Pn,Pm(×)Cn,Cm(×)Cn及Cm(×)Cn的平均距离.     

两类图的H-强迫数

设Cn和Pn分别表示顶点数为n的圏和路.研究了Cm×Cn和Pn×Pn的H-强迫集并且得出Cm×Cn和Pn×Pn的H-强迫数分别为h(Cm×Cn)=mn/2,m,n都为偶数mn,m,n至少有一个奇数和h(Pn×Pn)=n2/2-2.     

图Cn×K2的边优美标号的研究

文章研究了图Cn×K2的边优美性,证明了当n=1（mod2）时,图Cn×K2不是边优美图,同时给出当n=0（mod2）时图Cn×K2边优美标号的算法,并利用此算法编写Java程序,得出当n=2,4,6,8,10时图Cn×K2的边优美标号．     

路与圈的叉积图的消圈数

研究了路与圈的叉积图的消圈数.对一般的路Pm和圈Cn,得到了Pm×Cn的消圈数的一个紧的下界;对一些特殊的Pm路和圈Cn,得到Pm×Cn的消圈数的准确值.     

略论线性方程组解的误差估计

由于计算机计算时会出现舍入误差和舍位误差,因此用计算机解线性方程组Ax=b(A∈Cn×n,b∈Cn)时就不可避免地会有计算误差,本文借助矩阵范数和向量范数的概念,结合矩阵幂级数的有关结论,给出了线性方程组Ax=b(A∈Cn×n,b∈Cn)解的绝对误差和相对误差的四个上界.     

Inhomogeneous Eigenvalue Problems

IntroductionGivenamatrixA∈Cn×n,b∈Cn,b≠0,considerthefollowinginhomogeneouseigenvalueproblem:determine(λ,x)∈C×Cn,suchthat(A-λI)x=b,‖x‖2=1(1)hereλiscalledaninhomogeneouseigenvalueofmatrixAwithrespecttob.Letσ(A|b)denotethesetoftheseinhomogeneousei     

若干叉积图的平衡指标集

研究了叉积图的相关性质,得到了路Pm和圈Cn的叉积图Pm×Cn,路与路的叉积图Pm×Pn的平衡指标集。     

几类图的表示数

探讨了完全二部图Km1,m2,完全图卡氏积图Km×Kn和完全图并图Km Kn的表示数。找出了Km1,m2表示数的上限,并进一步缩小上限;获得了Km×Kn和Km Kn表示数的下限。     

Studies on reduced extent method for inhibited thermokinetics of enzyme-catalyzed reaction

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     

Y_CΩ_(2n)are easy terms

For any natural number n≥1, Y CΩ 2n is an easy term; that is, for any λ term M, λβ+Y\-CΩ 2n =M is consistent, where Y C is Curry fixed point combinator, Ω 2n ≡ω 2n ω 2n and ω 2n ≡λx.xx...x (there are 2n occurrences of x after λx ). This result is a partial solution to Jacopini's conjecture: Y CΩ n is an easy term for any natural number n≥2.     

Experimental and theoretical studies of the reaction between cationic vanadium oxide clusters and acetylene

The time of flight mass spectrometer coupled with a laser ablation/supersonic expansion cluster source and a fast flow reactor was adopted to study the reactivity of cationic vanadium oxide clusters （VinOS,） toward acetylene （C2H2） molecules under gas phase （P, - 1.14 kPa）, under near room temperature （T, - 350 K） conditions. Association products, VmOnC2H2^＋ （m,n = 2,4; 2,6; 3,7-8; 4,9-11; 5,12-13; 6,13-16, and 7,17）, are observed. The oxidation of C2H2 by （V2Os）n^＋ （n = 1 -3） is experimentally identified. The reactivity of （V2O5）n^＋ decreases as n increases. Density functional theory （DFT） calculations were carried out to interpret the reaction mechanisms. The DFT results indicate that a terminal oxygen atom from V2O5^＋ can transfer overall barrierlessly to C2H2 at room temperature, which is in agreement with the experimental observation. Other experimental results such as the observation of V206C2H2^＋ and nonobservation of V2O7,8C2H2^＋ in the experiments are also well interpreted based on the DFT calculations. The reactivity of vanadium oxide clusters toward acetylene and other hydrocarbons may be considered in identifying molecular level mechanisms for related heterogeneous catalysis.     

Fluorescence Determination of Artemisinin Using Hemoglobin as Catalyst and Pyronine B as Substrate

0 IntroductionMaalnadria siusb atr ompajicosr .he aAltrthe pmrisoibnlienmi (n qtihneghtraoopsiucs,QHS,Fig.1) is a sesquiterpene endoperoxide isola-ted fromArtemisia annuaL., an ancient Chineseherbal medicine usedfor treatment of fever and ma-laria.Studies of the structure and activity relation-ship have shownthat endoperoxide groupis essentialfor anti malarial activity of QHS and absence of thismoiety lead to completely loss in activity of thedrug. Many techniques have been developed to de…     

High molecular weight (C35 +) n-alkanes of Neogene heavily biodegraded oil in the Qianmiqiao region, North China

With wax content of 1.62%, heavy oil has been produced from the sandstone reservoirs of Neogene Guantao Formation (Ng1^Ⅲ). In the GC and GC-MS RIC profiles of its aliphatic fraction, n-alkanes are totally lost, which shows the result of heavy biodegradedation. However, the remaining trace C₁₃－C₃₆ n-alkanes can be still seen from its m/z 85 mass chromatogram. In addition, a complete series of C₃₅－C₇₃ high molecular weight (HMW) n-alkanes was detected by high-temperature gas chromatography (HTGC). The HMW n-alkane series shows a normal distribution pattern, a major peak at nC₄₃, obvious odd-carbon-number predominance, CP_I37—55 and OEP_45—49 values up to 1.17 and 1.16—1.20 respectively. The present study not only has conformed the strong resistibility of HMW n-alkanes to biodegradation in crude oils as concluded by previous researchers, but also has provided some significant information on source input and maturity for the heavily biodegraded oil in the Qianmiqiao region.     

一类图的谱

设K_m是m阶完全图,将n+1个m阶完全图通过固定的方式连结,得到(mn+m)阶完全关联图H_n,K_m。在利用商矩阵及秩的相关结论后,给出了完全关联图H_n,K_m的邻接矩阵、拉普拉斯矩阵和无符号拉普拉斯矩阵的特征值,从而确定了完全关联图H_n,K_m的邻接谱、拉普拉斯谱和无符号拉普拉斯谱。同时,基于对Brualdi-Solheid谱半径问题的研究,并将这类谱半径问题推广到图的拉普拉斯谱半径和无符号拉普拉斯谱半径的研究中,给出了H_n,K_m(所有点数为N的完全关联图构成的集合,其中N=m(n+1))中邻接谱半径的上界,拉普拉斯谱和无符号拉普拉斯谱半径的上、下界;并刻画了H_n,K_m中邻接谱半径达到上界的极图,以及拉普拉斯谱和无符号拉普拉斯谱半径达到上、下界时的极图。     

Formation, structure and properties of GeCn± and Ge2Cn± binary clusters

The binary cluster ions Ge₂C_n⁺/Ge₂C_n^- and GeC_n⁺ have been produced by laser ablation. The parity effect is present in the negative ions Ge₂C_n^-, though it is not very prominent. While the experiments tell that the parity effect is totally not shown in the positive ions Ge₂C_n⁺. An extensive theoretical investigation on GeCn/GeC_n⁺/GeC_n^-(n=1-10) and Ge₂Cn/Ge₂C_n⁺/Ge₂C_n^-(n=1-9) has been carried out by density functional theory at B3LPY level. The calculation shows that the low-lying states of GeC_n/GeC_n⁺/GeC_n^-(n=1-10) and Ge₂C_n/Ge₂C_n⁺/Ge₂C_n^-(n=1-9) are linear structure with germanium atoms locating at terminals respectively. The electronic distributions, ionization potential (IP_ad), elec-tron affinity (EA) and increasing bonding energy reveal that the parity effect of neutral species is much stronger than that of ions, which is attributed to the valence π-electrons. It is explained that the differences between experiments and cal-culations are due to the kinetic factor in the formation of Ge₂C_n^±.     

Additive characters and orthogonal systems of polynomials in several indeterminates over residue class rings

Letm, n andk be positive integers, m> 1 andk≤ n. Let ‰ _m =‰m‰ denote the residue class ring modulom. Let ‰ _m denote the group of additive characters of ‰ _m denote the identity of ‰ _m . A necessary and sufficient condition for the systemf ₁,...,f _k ∈ ‰ _m [x ₁, ...,x _m ] to be orthogonal is given: for all additive characters ψ₁, ..., ψ _k ∈ ‰ _m with ψ_i,≠x₀ forsomei, . As corollaries, the result of Shiue-Sun-Zhang and the result of Sun are obtained.     

Calculation method of electronic structure and its application to (I h andI) fullerenes

A new calculation method was discussed to treat the Hückel Hamiltonian of any fullerene with a certain point group symmetry. This method was applied to calculating the electronic energy levels of icosahedral fullerenes C\-n(I\-h: n=60h 2, 0相似文献   

Concentrations, profiles and gas-particle partitioning of PCDD/Fs, PCBs and PBDEs in the ambient air of an E-waste dismantling area, southeast China

Polychlorinated diebenzo-p-dioxins （PCDDs）, polychlorinated diebenzofurans （PCDFs）, polychlorinated biphenyls （PCBs） and polybrominated diphenyl ethers （PBDEs） were monitored in the ambient air of Taizhou, an E-waste dismantling area of southeast China to evaluate their concentrations, profiles and gas-particle partitioning. The ∑PCDD/Fs concentrations ranged from 2.91 to 50.6 pg/ma, with an average of 14.3 pg/ma. The I-TEQs for PCDD/Fs were in the range of 0.20-3.45 pg/ma, with an average of 1.10 pg/ma, The ∑PCBs concentrations and TEQs ranged from 4.23 to 11.35 ng/ma, 0.050 to 0.859 pg（TEQ）/ma, respectively. The concentrations of ∑PBDEs ranged from 92 to 3086 pg/ma, with an average of 894 pg/ma, The pollution levels of PCDD/Fs, PCBs and PBDEs were higher than other urban sites, which may be associated with the E-waste dismantling activities. The PCDD/Fs were found exclusively in the particle phase whereas PCBs distributed dominantly in the gas phase. The gas-partilce partitioning was also assessed by correlating the gas-particle partition coefficient （Kp） with the subcooled liquid vapor pressure （pL^0）. The measured particulate sorptions of PCDD/Fs, PCBs and PBDEs were compared with the predictions from Junge-Pankow model and Koa absorption model. The Junge-Pankow model well estimated the particulate fractions of PCBs. However, it underestimated the sorptions of PCDD/Fs and overestimated the fractions of PBDEs. The predicted particulate fractions of PCDD/Fs and PCBs from Koa model fitted well with the measured data.