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Search Results: 1 - 10 of 54793 matches for " HUANG Xue-xi "
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Response of CH4 emission of paddy fields to land management practices at a microcosmic cultivation scale in China
SHAO Jing-an,HUANG Xue-xi,GAO Ming,WEI Chao-fu,XIE De-ti,CAI Zu-cong,
SHAO Jing-an
,HUANG Xue-xi,GAO Ming,WEI Chao-fu,XIE De-ti,CAI Zu-cong

环境科学学报(英文版) , 2005,
Abstract: The terrestrial ecosystem may be either a source or a sink of CH_4 in rice paddies, depending, to a great extent, on the change of ecosystem types and land use patterns. CH_4 emission fluxes from paddy fields under 4 cultivation patterns (conventional plain culture of rice(T1), no-tillage and ridge culture of rice(T2), no-tillage and ridge culture of rice and wheat (T3), and rice-wheat rotation(T4)) were measured with the closed chamber technique in 1996 and 1998 in Chongqing, China. The results showed that differences existed in CH_4 emission from paddy fields under these land management practices. In 1996 and 1998, CH_4 emission was 71 48% and 78 82%(T2), 65 93% and 57 18%(T3), and 61 53% and 34 22%(T4) of that in T1 during the rice growing season. During the non-rice growing season, CH_4 emission from rice fields was 76 23% in T2 and 38 69% in T1 The accumulated annual CH_4 emission in T2, T3 and T4 in 1996 decreased by 33 53%, 63 30% and 65 73%, respectively, as compared with that in T1 In 1998, the accumulated annual CH_4 emission in T1, T2, T3 and T4 was 116 96 g/m~2, 68 44 g/m~2, 19 70 g/m~2 and 11 80 g/m~2, respectively. Changes in soil physical and chemical properties, in thermal and moisture conditions in the soil and in rice plant growth induced by different land use patterns were the dominant causes for the difference in CH_4 emission observed. The relative contribution of various influencing factors to CH_4 emission from paddy fields differed significantly under different land use patterns. However, the general trend was that chlorophyll content in rice leaves, air temperature and temperature at the 5 cm soil layer play a major role in CH_4 emission from paddy fields and the effects of illumination, relative humidity and water layer depth in the paddy field and CH_4 concentration in the crop canopy were relatively non-significant. Such conservative land use patterns as no-tillage and ridge culture of rice with or without rotation with wheat are thought to be beneficial to reducing CH_4 emission from paddy fields and are, therefore, recommended as a significant solution to the problems of global(climatic) change.
Mass transport model of ions within biofilms under the effect of external field
WANG Jun,TANG Xue-xi,
WANG Jun
,TANG Xue-xi

环境科学学报(英文版) , 2006,
Abstract: A mass transport model was developed to predict the transport rate of ions within biofilms, which was experimentally verified using the fluxes of NH4+ and Ca2+ through the heterotrophic biofilms with the thickness varying from 230 to 1430 microm under the effect of external field in the range of -20 V/m to 60 V/m. It is found that the result predicted by the model is in agreement with the experimentally obtained one, with the error less than 5 percent for the thin biofilms. The error increases with the increase of the biofilm thickness. The transport rate of ions caused by electric migration is affected by the charges, field strength, and biofilm thickness and so on.
BOSE-EINSTEIN CONDENSATION IN FINITE-NUMBEF TRAPPED ATOMS
有限数目捕获原子的玻色-爱因斯坦凝聚

YI XUE-XI,
衣学喜

物理学报 , 1999,
Abstract: The BEC in finite-number trapped atoms is investigated in this paper. The results show that the transition temperature is decreased by the finite-number effect, and the interactions between the atoms change the transition temperature, too. The specific heat below the transition point is no longer proportional to T3/2. In addition to the above effects, the distribution of the trapped atoms depend on its number. The repulsive interaction between the atoms also dilute the density of the atoms.
Effect of alginic acid decomposing bacterium on the growth of Laminaria japonica (Phaeophyceae)
WANG You,TANG Xue-xi,YANG Zhen,YU Zhi-ming,
WANG You
,TANG Xue-xi,YANG Zhen,YU Zhi-ming

环境科学学报(英文版) , 2006,
Abstract: We collected the diseased blades of Laminaria japonica from Yantai Sea Farm from October to December 2002, and the alginic acid decomposing bacterium on the diseased blade was isolated and purified, and was identified as Alteromon as espejiana. This bacterium was applied as the causative pathogen to infect the blades of L. japonica under laboratory conditions. The aim of the present study was to identify the effects of the bacterium on the growth of L. japonica, and to find the possibly effective mechanism. Results showed that: (1) The blades of L. japonica exhibited symptoms of lesion, bleaching and deterioration when infe cted by the bacterium, and their growth and photosynthesis were dramatically sup pressed. At the same time, the reactive oxygen species(ROS) generation enhanced obviously, and the relative membrane permeability increased significantly. The c ontents of malonaldehyde(MDA) and free fatty acid in the microsomol membrane gre atly elevated, but the phospholipid content decreased. Result suggested an obvio us peroxidation and deesterrification in the blades of L. japonica when infected by the bacterium. (2) The simultaneous assay on the antioxidant enzyme activiti es demonstrated that superoxide dismutase (SOD) and catalase(CAT) increased grea tly when infected by the bacterium, but glutathione peroxidase(Gpx) and ascorbat e peroxidase(APX) did not exhibit active responses to the bacterium throughout t he experiment. (3) The histomorphological observations gave a distinctive eviden ce of the severity of the lesions as well as the relative abundance in the bacte rial population on the blades after infection. The bacterium firstly invaded int o the endodermis of L. japonica and gathered around there, and then resulted in the membrane damage, cells corruption and ultimately, the death of L. japonica.
Production and realization of marine ecosystem services
海洋生态系统服务的产生与实现

WANG Qi-Xiang,TANG Xue-Xi,
王其翔
,唐学玺

生态学报 , 2009,
Abstract: Based upon expatiation of the connotation of marine ecosystem services, we analyze the production processes and realization approaches of marine ecosystem services. We attempt to link major components and (or) functions of marine ecosystem to their related services. The physiological and ecological processes from each components and (or) functions to their related services are also presented. The results we obtained show that there are 2 sets of production processes. Some services are directly produced from the biological components and (or) system. The others are produced by system functions. The physiological and ecological processes do not produce services directly. The realization of marine ecosystem services contains 2 approaches. One approach is marine ecosystem; the other is marine ecological- economic system.
Mean-Field Dynamics of a Two-Mode Bose-Einstein Condensate Subject to Decoherence

CUI Bo,WU Song-Lin,YI Xue-Xi,

中国物理快报 , 2010,
Abstract: We discuss the dynamics of Bose-Einstein condensates in a double-well potential subject to decoherence (or particle loss). Starting from the full many-body dynamics described by the master equation, an effective Gross-Pitaevskii-like equation is derived in the mean-field approximation. By numerically solving the GP equation, we find that macroscopic quantum self-trapping disappears for strong decoherence, while generalized self-trapping occurs under weak decoherence. The fixed points have been calculated, and we find that an abrupt change from elliptic to an attractor and a repeller occurs, reflecting the metastable behavior of the system around these points.
Sudden Transition between Quantum Correlation and Classical Correlation: the Effect of Interaction between Subsystems

YAN Jun-Yan,WANG Lin-Cheng,YI Xue-Xi,

中国物理快报 , 2011,
Abstract:
Discord under the influence of a quantum phase transition

Wang Lin-Cheng,Shen Jian,Yi Xue-Xi,

中国物理 B , 2011,
Abstract: This paper studies the discord of a bipartite two-level system coupling to an XY spin-chain environment in a transverse field and investigates the relationship between the discord property and the environment's quantum phase transition. The results show that the quantum discord is also able to characterize the quantum phase transitions. We also discuss the difference between discord and entanglement, and show that quantum discord may reveal more general information than quantum entanglement for characterizing the environment's quantum phase transition.
Fast and accurate self-localization of mobile robot based on multi-sensor
基于多传感器信息融合的移动机器人快速精确自定位

ZHANG Xue-xi,YANG Yi-min,
张学习
,杨宜民

控制理论与应用 , 2011,
Abstract: A method based on the fusion of multi-sensor information is proposed for self-localization of the mobile robot in known environment. It provides the configuration of the multi-sensor information fusion system and analyzes the all-forward wheel, omni-vision and electrical compass. The Monte Carlo(MCL) particle filtration method combines the measured data of sensors in various observation points to achieve the fusion localization for the mobile robot. Being different from the traditional single-sensor self-localization of the mobile robot, this method synthesizes the incomplete information from heterogeneous or homogeneity sensors and the related data from the data-base, thus, reducing the uncertainty in the information from a single sensor and improving the accuracy in self-localization. Because of the use of the observation model of the omni-vision, and the employment of the lookup table for determining the confidence interval in the realization of self-localization, this method achieves the required rapidity in obtaining the confidence interval for self-localization, ensuring its application in real time. Experimental results validate the proposed method.
3-(4-Amino-5-thioxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)pyridinium chloride
Guang-Qiang Zhao,Zhi-Fang Pan,Xue-Xi Tang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807062848
Abstract: In the title compound, C7H8N5S+·Cl , the dihedral angle formed by the pyridine ring with the triazole ring is 10.0 (1)°. There are weak intermolecular hydrogen-bond interactions in the crystal structure, involving the NH and NH2 groups as donors, and the chloride anion, the S atom in the thioketone group and the unsubstituted ring N atom as acceptors.
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