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景观连接度的概念、度量及其应用 被引量:102
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作者 吴昌广 周志翔 +2 位作者 王鹏程 肖文发 滕明君 《生态学报》 CAS CSCD 北大核心 2010年第7期1903-1910,共8页
景观连接度是指景观促进或阻碍生物体或某种生态过程在源斑块间运动的程度,反映了景观的功能特征。景观连接度理论与方法是景观评价、管理和生态规划的重要基础,对于区域可持续发展和生物多样性保护等方面的研究都具有重要指导意义。综... 景观连接度是指景观促进或阻碍生物体或某种生态过程在源斑块间运动的程度,反映了景观的功能特征。景观连接度理论与方法是景观评价、管理和生态规划的重要基础,对于区域可持续发展和生物多样性保护等方面的研究都具有重要指导意义。综述了国内外近10a来有关景观连接度概念、度量方法及其生态学意义的最新进展,并探讨了景观连接度与景观要素间的关系及其潜在应用前景,以期为深入开展景观空间格局与生态过程间关系的研究与应用提供参考。 展开更多
关键词 景观连接 结构连接度 功能连接 量方法 生物多样性保护 景观规划
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Dynamic analysis of elastic screen surface with multiple attached substructures and experimental validation 被引量:2
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作者 王宏 刘初升 +2 位作者 彭利平 蒋小伟 冀连权 《Journal of Central South University》 SCIE EI CAS 2012年第10期2910-2917,共8页
A feasible method to improve the reliability and processing efficiency of large vibrating screen via the application of an elastic screen surface with multiple attached substructures (ESSMAS) was proposed. In the ES... A feasible method to improve the reliability and processing efficiency of large vibrating screen via the application of an elastic screen surface with multiple attached substructures (ESSMAS) was proposed. In the ESSMAS, every screen rod, with ends embedded into elastomer, is coupled to the main screen structure in a relatively flexible manner. The theoretical analysis was conducted, which consists of establishing dynamic model promoted from the fuzzy structure theory as well as calculating for the equivalent stiffness of each attached structure. According to the numerical simulation using the NEWMARK-fl integration method, this assembling pattern significantly leads to the screen surface/rod having larger vibration intensity than that of the corresponding position on screen structure, which specifically, with an averaged acceleration amplitude increasing ratio of 11.37% in theoretical analysis and 20.27% in experimental test. The experimental results, within a tolerant error, also confirm the established model and demonstrate the feasibility of ESSMAS. 展开更多
关键词 mineral processing vibrating screen elastic screen surface attached substructures dynamic analysis reliability processing efficiency
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Geometry of the Second-Order Tangent Bundles of Riemannian Manifolds 被引量:1
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作者 Aydin GEZER Abdullah MAGDEN 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2017年第4期985-998,共14页
Let (M, g) be an n-dimensional Riemannian manifold and T2M be its second- order tangent bundle equipped with a lift metric g. In this paper, first, the authors con- struct some Riemannian almost product structures ... Let (M, g) be an n-dimensional Riemannian manifold and T2M be its second- order tangent bundle equipped with a lift metric g. In this paper, first, the authors con- struct some Riemannian almost product structures on (T2M, g) and present some results concerning these structures. Then, they investigate the curvature properties of (T2M, g). Finally, they study the properties of two metric connections with nonvanishing torsion on (T2M, g: The//-lift of the Levi-Civita connection of g to TaM, and the product conjugate connection defined by the Levi-Civita connection of g and an almost product structure. 展开更多
关键词 Almost product structure Killing vector field Metric connection Rie-mannian metric Second-order tangent bundle
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LBE simulation of impinging stream inside a T-junction mixer
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作者 XU WenKai ZHANG QingChen +1 位作者 GUI Nan ZHANG ZiWei 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2018年第7期1038-1055,共18页
Lattice Boltzmann Equation(LBE) method is utilized to simulate impinging stream(IS) in a T-junction mixer using a TD2G9 model. It aims to investigate the influence of Reynolds number(Re), aspect ratio of outlet diamet... Lattice Boltzmann Equation(LBE) method is utilized to simulate impinging stream(IS) in a T-junction mixer using a TD2G9 model. It aims to investigate the influence of Reynolds number(Re), aspect ratio of outlet diameter to inlet diameter, ratio of opposite inlet velocities, and the thermal boundary conditions on flow, mixing and heat transfer characteristics. In particular, the vortex evolution, velocity distribution, mixing index and Nusselt number(Nu) distribution in the T-junction mixer are explored in details. Four types of vortices and flow regimes are observed. The instantaneous and time-averaged flow and thermal fields,including vortex structure, transition of flow regimes, streamline and the Nusselt number distribution are discussed. Distinct quantitative transitions, even for dramatic change, are observed near the critical Re. At a low or moderate aspect ratio, the symmetric coherent structure is observed in an unstable flow regime. At a larger aspect ratio, the flow in the T-mixer becomes turbulent and asymmetric. The unequal injections velocities of the nozzles impose significant influence on the flow structure,mixing and heat transfer in vertical tube. Using larger difference between the two inlet velocities can result in more obvious change in flow characteristics. Moreover, mixing index is found to be valid in evaluating the mixing degree under a sinusoidal inlet velocity. 展开更多
关键词 impinging flow lattice Boltzmann method T-JUNCTION heat transfer flow characteristics
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