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Search Results: 1 - 10 of 167547 matches for " Xiao-Ming Li "
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Water condition and restoration of natural vegetation in the southern margin of the Taklimakan Desert

LI Xiao-Ming,

生态学报 , 2003,
Abstract: 塔克拉玛干沙漠南缘 (以下简称塔南 )是我国土地沙漠化最严重的地区之一 ,其主要原因是因为塔南绿洲边缘的自然植被遭到严重破坏。自然植被的恢复有赖于对主要植被类型生物学特性的了解 ,于 1 998~2 0 0 1年在位于塔南策勒绿洲边缘进行的中国 -欧盟合作研究项目 ( ERBIC1 8CT980 2 75 ) ,目的是探索塔南绿洲边缘自然植被可持续管理的生态学基础。通过对几种优势植物叶片 (或同化枝 )水分关系、气体交换、以及群落特性等方面的综合研究 ,得出了以下结论 :( 1 )塔南绿洲边缘的自然植被皆为隐域性植被 ,主要优势种为 :胡杨、柽柳、骆驼刺以及少量的灰杨 ,这种植物是依靠河流的地表水而发生 ,依靠河流地下水补给而生存 ;( 2 )由于缺乏充分的地表水的补给 ,现存的自然植被几乎不能实现自然更新 ;完全破坏后的自然植被已无自然恢复的可能性 ,必须使用人工辅助方法进行恢复 ;( 3)塔南绿洲边缘主要优势植物叶片 (或同化枝 )清晨水势和气体交换研究结果表明 ,依赖地下水生存的几种植物在整个生长季节没有发生严重的水分胁迫 ,保护和恢复绿洲边缘自然植被的必要条件是保持地下水位的相对稳定 ,禁止对地下水的过度开采。


系统科学与数学 , 1991,
Abstract: 一个 p 维随机向量 X=(x_1,…,x_p)′(p≥2),如果服从 p 维椭球等高分布,且具有密度函数,则密度函数一定具有如下形式:f(x)=C_p|∑|~(1/2)g((x-u)′∑~(-1)(x-u)).其中,∑>0,g(·)为某个非负可测函数,且 g(·)满足
catena-Poly[[tris[silver(I)-μ-4,4′-bipyridine-κ2N:N′]] tris(perchlorate) dihydrate]
Xiao-Ming Hu,Fu-An Li
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811040153
Abstract: In the title compound, {[Ag3(C10H8N2)3](ClO4)3·2H2O}n, one of the AgI ions, one of the 4,4′-bipyridine (bipy) ligands and one of the perchlorate anions are each situated on a twofold rotation axis. Each AgI ion is coordinated by two N atoms from two bridging bipy ligands, forming chains along [101]. π–π interactions between the pyridine rings [centroid–centroid distances = 3.638 (8) and 3.688 (8) ] connect the chains. Intermolecular O—H...O hydrogen bonds link the uncoordinated water molecules and the perchlorate anions.
Research on Trustworthy Distributed System
LUO Chen,HE Ming,LIU Xiao-Ming,LI Yuan
International Journal of Wireless and Microwave Technologies , 2012, DOI: 10.5815/ijwmt.2012.03.07
Abstract: To arrive at the goal of intensifying the trustworthiness and controllability of distributed systems, the core function of secure algorithms and chips should be fully exerted. Through building the trustworthy model between distributed system and user behaviors, constructing the architecture of trustworthiness distributed systems, intensifying the survivability of services, and strengthening the manageability of distributed systems, the secure problem of distributed systems is to be radically solved. By setting up the trustworthy computing circumstance and supplying the trustworthy validation and the active protection based on identity and behavior for trustworthy distributed system, we will reach the goal of defending the unaware viruses and inbreak. This research insists that the security, controllability, manageability, and survivability should be basic properties of a trustworthy distributed system. The key ideas and techniques involved in these properties are studied, andrecent developments and progresses are surveyed. At the same time, the technical trends and challenges are briefly discussed.
Fu-An Li,Fu Xu,Xiao-Ming Hu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811035112
Abstract: In the centrosymmetric binuclear title compound, [Cu2(C8H3ClO4)2(C12H12N2)2(H2O)4], the CuII ion is six-coordinated by two N atoms from a 5,5′-dimethyl-2,2′-bipyridine ligand, two bridging O atoms from two 3-chlorobenzene-1,2-dicarboxylate ligands and two water molecules in a distorted octahedral geometry. The binuclear complex molecules are linked together by intermolecular O—H...O hydrogen bonds into a layer parallel to (100). The layers are connected by C—H...Cl hydrogen bonds. Intramolecular O—H...O hydrogen bonds and π–π interactions [centroid–centroid distance = 3.5958 (16) ] are also present.
Some results on cascade discrete-time systems
Xiao-Ming Bai,Hui-Min Li
Discrete Dynamics in Nature and Society , 2006,
Abstract: We present sufficient conditions for global asymptotic stability of cascade discrete-time systems. Considering failure of the global asymptotic stability in some cascade systems, we give an estimate of the region of attraction of the systems.
Cross sections for meson-meson nonresonant reactions
Yu-Qi Li,Xiao-Ming Xu
Physics , 2007, DOI: 10.1016/j.nuclphysa.2007.08.009
Abstract: Meson-meson nonresonant reactions governed by the quark-interchange mechanism are studied in a potential that is derived from QCD. S-wave elastic phase shifts for I=2 \pi\pi and I=3/2 K \pi scattering are obtained with wave functions determined by the central spin-independent term of the potential. The reactions include inelastic scatterings of two mesons in the ground-state pseudoscalar octet and the ground-state vector nonet. Cross sections for reactions involving pion, rho, K and K^* indicate that mesonic interactions in matter consisting of only K and K^* can be stronger than mesonic interactions in matter consisting of only pions and rhos and the reaction of I=3/2 \pi K^* \to \rho K is most important among the endothermic nonresonant reactions. By the quark-interchange mechanism we can offer \sqrt s-dependences of phi absorption cross sections in collisions with pion and rho and relevant average cross sections what are very small for the reaction of I=1 \pi \phi \to K^* K^* and remarkably large for the reaction of I=1 \rho \phi \to K^* K^*. It is found from the \sqrt s-dependences of cross sections that rho and K^* creation cross sections can be larger than their absorption cross sections, respectively.
Necessary and sufficient condition for saturating the upper bound of quantum discord
Zhengjun Xi,Xiao-Ming Lu,Xiaoguang Wang,Yongming Li
Mathematics , 2011, DOI: 10.1103/PhysRevA.85.032109
Abstract: We revisit the upper bound of quantum discord given by the von Neumann entropy of the measured subsystem. Using the Koashi-Winter relation, we obtain a trade-off between the amount of classical correlation and quantum discord in the tripartite pure states. The difference between the quantum discord and its upper bound is interpreted as a measure on the classical correlative capacity. Further, we give the explicit characterization of the quantum states saturating the upper bound of quantum discord, through the equality condition for the Araki-Lieb inequality. We also demonstrate that the saturating of the upper bound of quantum discord precludes any further correlation between the measured subsystem and the environment.
Hydration kinetics of cementitious materials composed of red mud and coal gangue
Na Zhang,Hong-xu Li,Xiao-ming Liu
- , 2016, DOI: https://doi.org/10.1007/s12613-016-1341-x
Abstract: To elucidate the intrinsic reaction mechanism of cementitious materials composed of red mud and coal gangue (RGC), the hydration kinetics of these cementitious materials at 20°C was investigated on the basis of the Krstulovi?–Dabi? model. An isothermal calorimeter was used to characterize the hydration heat evolution. The results show that the hydration of RGC is controlled by the processes of nucleation and crystal growth (NG), interaction at phase boundaries (I), and diffusion (D) in order, and the pozzolanic reactions of slag and compound-activated red mud–coal gangue are mainly controlled by the I process. Slag accelerates the clinker hydration during NG process, whereas the compound-activated red mud–coal gangue retards the hydration of RGC and the time required for I process increases with increasing dosage of red mud–coal gangue in RGC.
Effects of oxygen enriched tent by a new oxygen concentration machine on blood oxygen saturation and heart rate in tibet  [PDF]
Guang-Hao Shen, Kun Wang, Li-Hua Lu, Kang-Ning Xie, Qiao-Ling Xu, Xiao-Ming Wu, Chi Tang, Er-Ping Luo
Journal of Biomedical Science and Engineering (JBiSE) , 2011, DOI: 10.4236/jbise.2011.42019
Abstract: Many people who live in the low altitude areas are often suffered from hypoxia when they entered the high plateau. This problem may seriously influence the physical and mental state and work efficacy for the travelers and workers. Oxygen enrichment of a small space air at high altitude is considered as a simple way to provide lowlanders enriched oxygen for sleeping and resting, improving work efficiency, so we developed an oxygen concentration machine based on the technology of oxygen enrichment membrane. This paper tested 8 healthy male lowlanders (age 21.63±1.77 yr) who have never exposed to plateau performed an incremental exercise on cycle ergometer at sea-level in order to be used as sea-level controls. Two days later, the same subjects were taken to Lhasa (3700 m) by air and exposed to the plateau, performed the same exercise as they did at sea-level. The next day, all subjects were asked to enter the experimental tent which was enriched with oxygen (higher than 24%) by the oxygen concentration machine and sleep for 10 hours at night, then exposed to plateau and performed the same exercise twice at different time (2 hours and 10 hours after oxygen enrichment). During the tests, subjects must cycled continuously at 60 rpm beginning with a 3 min exercise intensity of 0 W followed by incremental increases of 25 W every 3 min until 150 W, pulse oxygen saturation (SpO2) and heart rate (HR) were recorded. After sleeping in an oxygen enrichment of tent air, 2 hours later, the subjects’ load capacity had no difference compared with control group, but significant difference than before (higher SpO2 and lower HR), which indicated that oxygen concentration machine is effective in increasing the oxygen concentration of the air for the tent and sleeping in the oxygen enrichment tent for l0 h might be effective in improving exercise performance during high-altitude hypoxia. At the same time, 10 hours later, when work-load exceeded 125 W, the same effects were also found. The results indicated the effects of oxygen enrichment of tent air could last a certain period of time.
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