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浮游植物现存量表征指标间相关性研究Ⅰ:叶绿素a与生物量 总被引:6,自引:0,他引:6
DU Shenglan HUANG Suiliang ZANG Changjuan WU Min GAO Feng LIN Chao GUO Yong LUO Yang 《水资源与水工程学报》2011,22(1)
收集国内、外有关资料,并结合潘家口水库现场围隔实验,主要从实验室内研究水体、野外围隔水体及天然水体三个方面,对浮游植物叶绿素a含量与生物量间的相关性进行探讨。结果表明:在实验室条件下,叶绿素a与生物量一般呈显著正相关关系,但当优势藻种发生明显变更时,二者相关性不明显甚至不相关;现有资料显示,野外围隔实验水中,叶绿素a与生物量一般呈显著正相关。在天然水体中,叶绿素a与生物量可能相关或不相关。叶绿素a与藻密度的关系将在续文中予以讨论。 相似文献
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浮游植物现存量表征指标间相关性研究Ⅱ:叶绿素a与藻密度 总被引:3,自引:0,他引:3
DU Shenglan HUANG Suiliang ZANG Changjuan WU Min GAO Feng LIN Chao GUO Yong LUO Yang 《水资源与水工程学报》2011,22(2):44-49
在前文研究叶绿素a与生物量基础上,本文收集国内、外有关资料,并结合潘家口水库现场围隔实验,主要从室内研究水体、野外围隔水体及天然水体三个方面,进一步探讨浮游植物叶绿素a含量与藻密度间的相关性。结果表明:实验室内藻类纯培养或共培养优势藻种稳定单一时,叶绿素a与藻密度呈显著正相关,优势藻发生变更时,二者可能相关或不相关;围隔实验水体及天然水体中优势藻种稳定单一时,叶绿素a与藻密度一般显著正相关,而藻种发生明显更替时,叶绿素a与藻密度可能相关或不相关。 相似文献
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LIN Peifeng WU Dichong YU Mingzhou WANG Chao ZHANG Lite ZHU Zefei Faculty of Mechanical Engineering & Automation Zhejiang Sci-Tech University Hangzhou China Business Administration College Zhejiang University of Finance Economics Hangzhou China 《机械工程学报(英文版)》2011,(6):947-956
Particle coagulation by Brownian motion is an important but difficult research topic.When particle volume concentration is larger than 0.1%,the classic SMOLUCHOWSKI equation is not applicative anymore.The high concentration coagulation,with HEINE’s correction,source terms for the Taylor-series expansion method of moments(TEMOM) are firstly driven in this paper.Ultra-fine particle(d0?100 mm) with initial volume fraction f?1% coagulation in a planar jet turbulence flow is simulated via the large eddy simulation(LES).The instantaneous and time-averaged particle distributions and the high concentration enhancement are given out.The particle number concentration distribution results show that the coagulation is more intense comparing to dilute case in previous research,especially near the nozzle exit.After jet flow is fully developed,the effect is much more obvious at the region between vortexes.The time-averaged γ(the high concentration enhance factor) distributes sharply and symmetrically about the jet centerline at the upstream,but becomes broad and flat at downstream where the cross-stream averaged γ fluctuates drastically.As a new attempt,this paper shows Brownian coagulation with high concentration also can be calculated via TEMOM appropriately,and the coagulation at the region between vortexes is about 1.38 times intensive of the dilute result calculated by the classic Smoluchowski theory. 相似文献
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Weijia LIU Zhenzhi LIN Fushuan WEN Yusheng XUE Yan DAI Weizhen SUN Chao WANG 《电力系统自动化》2012,36(8):154-160
The optimization of black-start decision-making plays an important role in the rapid restoration of a power system after a major failure/outage.With the introduction of the concept of smart grids and the development of real-time communication networks,the black-start decision-makers are no longer limited to only one or a few power system experts such as dispatchers,but rather a large group of professional people in practice.The overall behaviors of a large decision-making group of decision-makers/experts are more complicated and unpredictable.However,the existing methods for black-start decision-making cannot handle the situations with a large group of decision-makers.Given this background,a clustering algorithm is presented to optimize the black-start decision-making problem with a large group of decision-makers.Group decision-making preferences are obtained by clustering analysis,and the final black-start decision-making results are achieved by combining the weights of black-start indexes and the preferences of the decision-making group.The effectiveness of the proposed method is validated by a practical case.This work extends the black-start decision-making problem to situations with a large group of decision-makers. 相似文献
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