共查询到20条相似文献,搜索用时 350 毫秒
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The purpose of the paper is to elucidate the biological effect of benzene on the basis of benzene constitution, quantum chemistry and quantum biology. In addition, we also have examined the toxicological mechanism of benzene in view of action of benzene on energy. 相似文献
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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
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《河北大学学报(自然科学版)》1997,(1)
UltrastructureofHepatopancreasCelsofMacrobrachiumnipponensisWangWeinaWangAnliWeiXuanhuiGuoMingshen(DepartmentofBiology,HebeiU... 相似文献
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CHEN Ying WANG Jun XUE Bin WANG Wei 《科学通报(英文版)》2006,51(21):2559-2565
The orientation between the backbone residues of proteins is defined based on the local configurations and the corresponding preferences are analyzed by statistics.It is found that all the residue pairs have some specific preferences of orientations.The statistical analysis is mainly concen-trated in the orientational distributions for two kinds of groupings of residues based on the hydrophobicity and secondary structural features.The statistics for such two types of groupings shows different orienta-tional preferences.It is found that for the former grouping the orientational preference is rather weak, while for the later a kind of strong orientational pref-erences.This suggests that the formation of local structures and of secondary structures are highly related to the orientational preferences. 相似文献
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completed.□ Lemma2 .2 Suppose H to be a Hilbert spacewith the inner product ( .,.) H and the relativenorm‖·‖H.If{xn}in H weakly converges tox,then there exists a subsequence {xni}satisfyingthatx - 1k ki=1xni H→ 0 , k→∞ . The proof can be found in Ref.[9]. Lemma 2 .3 Suppose W* to be a symmetricform on D[W],and W* [u]≤ W1[u]for all u∈D[W].If {un}∈D[W]in H converges W1- weak-ly to u,then it converges W* - weakly to u. The proof can be found in Ref.[8]. Lemma 2 .4… 相似文献
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CHENG Zunlan GENG Xueyong DANG Chao LIU Jingjing 《武汉大学学报:自然科学英文版》2007,12(4):588-594
Glaciers are extensively developed in the southwest of Tibet and the moraines are widely distributed with large depth. Large-scale debris flows are often reported which blocked rivers and formed dams. In this paper, seven large debris flows in four valleys are discussed, among which five dams developed. 13 sets of experiments have been conducted in laboratory to simulate the formation and failure of the dam. Finally, a model of dam failure is proposed and a formula is established to calculate the flood discharge: Q=kbnnk/TB^-/LG^0.1,where bk is the outlet width of the dam at the original water level, hk the erosive depth, T the time from overflow to final state of failure, the average width of lake; L the length of the lake, and G the total potential energy of the water in the lake. 相似文献
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DENG Bo PANG XiaoFeng 《科学通报(英文版)》2007,52(23):3179-3182
Effects of static magnetic field on optic properties of water are investigated by infrared spectroscopy, ultraviolet spectroscopy and X-ray diffraction, respectively. The ultraviolet spectroscopy experiments show the changes of properties of water under action of static magnetic field, in the region of 191 to 400 nm. The infrared experiment shows that the water exposed in a magnetic field had saturation and memory effects. The magnetized effects increased with increasing exposed time, but were weakened with increasing of time when the magnetic field was removed. In the X-ray experiment, the strength of diffraction increased also, after the water was exposed in magnetic field. Meanwhile, the shift of peak and increase of strength of X-ray diffraction of magnetized water added with nanoFe3O4 occurred as compared with that of pure water added with nano Fe3O4. This result suggests that the magnetized wa- ter has certain magnetism. Finally, these phenomena are simply explained by the molecular structure of water and the theory of magnetization of water. 相似文献
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We introduced stability of arbitrary degree number for unfordings of bifurcation problems and established the equivalence
of three stabilities. Thom's transversality theory is used to character the new stability.
Foundation item: Supported by the National Natural Science Foundation of China (19871074)
Biography: Zhang Guo-bin (1939-), male, Professor, research interest: singularity theory. 相似文献
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A new dynamical evolutionary algorithm (DEA) based on the theory of statistical mechanics is presented. This algorithm is
very different from the traditional evolutionary algorithm and the two novel features are the unique of selecting strategy
and the determination of individuals that are selected to crossover and mutate. We use DEA to solve a lot of global optimization
problems that are nonlinear, multimodal and multidimensional and obtain satisfactory results.
Foundation item: Supported by the National Natural Science Foundation of China (No. 60133010, NO. 60073043 and No. 700/1042)
Biography: Zou Xiu-fen(1996-), female, Ph. D candidate, Associate professor, research direction: evolutionary computing, parallel
computing. 相似文献
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We present an improved method. If we assume that the objective function is twice continuously differentiable and uniformly
convex, we discuss global and superlinear convergence of the improved quasi-Newton method.
Fei Pusheng: born in Mar. 1941. Professor. Current research interest is in optimization theory and application
Supported by the National Natural Science Foundation of China 相似文献
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This paper investigates the competition diffusion model with delay. The existence and stability of nontrivial steady state
are studied.
Foundation item: Supported by the National Natural Science Foundation of China
Biography: ZHOU Li (1939-), male, Professor, research interest is in partial differential equation. 相似文献
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探讨了一类时滞中立型脉冲系统的全局指数稳定性问题.基于李雅普诺夫稳定性理论,运用线性矩阵下等式技术给出了系统的全局指数稳定性的充分条件,并利用该理论可进一步分析其它中立型脉冲时滞系统的指数稳定性问题。 相似文献
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Combining with the research on the linear complexity of explicit nonlinear generators of pseudorandom sequences, we study the stability on linear complexity of two classes of explicit inversive generators and two classes of explicit nonlinear generators. We present some lower bounds in theory on the k-error linear complexity of these explicit generatol's, which further improve the cryptographic properties of the corresponding number generators and provide very useful information when they are applied to cryptography. 相似文献
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Yu Chang-an 《武汉大学学报:自然科学英文版》2000,5(4):379-385
In this paper, we obtain an explicit formula of general solution for a class of the non-homogeneous recurrence of variable
coefficients with two indices.
Foundation item: Supported by the National Natural Science Foundation of China (19771063)
Biography: Yu Chang-an(1948-), male, Professor, research interest: combinatorial theory. 相似文献
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The reflective function of differential system 总被引:1,自引:0,他引:1
Zhou Zheng-xin 《武汉大学学报:自然科学英文版》2002,7(4):383-387
This article deals with the reflective function of the differential systems. The results are applied to discussion of the
existence and stability of the periodic solutions of these systems.
Foundation item: Supported by the National Natural Science Foundation of Jiangsu Educational Committee (02 KJB 110009)
Biography: Zhou Zheng-xin(1962-), female, Ph. D, Associate professor, research interests: ordinary differential equation. 相似文献
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Zhao Chun Zou Hua-min Wang Ren-hui Duan Xiao-feng Wang Da-hai Gao La-mei 《武汉大学学报:自然科学英文版》2000,5(1):051-055
The procedure of simulating convergent beam electron diffraction (CBED) pattern of quasicrystals by dynamical theory is described.
The simulated patterns are generally coincide with the experimental patterns. The variations of intensity distribution in
CBED pattern with the amplitude and phase of the structure factor of quasicrystal are calculated with dynamical theory. The
sensitivity of intensity distribution to the structure factor is investigated.
Foundation item: Supported by the National Natural Science Foundation of China (59871034)
Biography: Zhao Chun (1974-), female, Master candidate. Research direction: diffraction physics. 相似文献
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Based on existing algorithms, a newly developed contact search algorithm is proposed. The new algorithm consists of global
search, local searching, local tracking and penetration calculation processes. It requires no iteration steps. It can deal
with not only general tool surfaces with vertical walls, but also tool surfaces meshed with elements having very poor aspect
ratios. It is demonstrated that the FE code employing this new contact search algorithm becomes more reliable, efficient and
accurate for sheet metal forming simulation than conventional ones.
Foundation item: Supported by the National Natural Science Foundation of China (59875025) and Excellent Young Teacher Foundation
of the Educational Department of China
Biography: Zhang Hai-ming (1974-), male, Ph. D. candidate, research direction: sheet metal forming simulation. 相似文献