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| 1 | Measures against the adverse impact of natural wind on air-cooled condensers in power plant显示文摘The natural wind plays disadvantageous roles in the operation of air-cooled steam condensers in power plant.It is of use to take various measures against the adverse effect of wind for the performance improvement of air-cooled condensers.Based on representative 2×600 MW direct air-cooled power plant,three ways that can arrange and optimize the flow field of cooling air thus enhance the heat transfer of air-cooled condensers were proposed.The physical and mathematical models of air-cooled condensers with various flow leading measures were presented and the flow and temperature fields of cooling air were obtained by CFD simulation.The back pressures of turbine were calculated for different measures on the basis of the heat transfer model of air-cooled condensers.The results show that the performance of air-cooled condensers is improved thus the back pressure of turbine is lowered to some extent by taking measures against the adverse impact of natural wind. | YANG LiJun,DU XiaoZe & YANG YongPing Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education of China,North China Electric Power University,Beijing 102206,China | 2010 | Science China(Technological Sciences)2010，53，5： | 21 |
| 2 | Application of polynomial chaos on numerical simulation of stochastic cavity flow显示文摘In present paper,the mathematic background of intrusive polynomial chaos (IPC) method and coupling process with one dimension Euler equation were introduced. The IPC method was implemented for the 2D compressible stochastic Navier-Stokes equations to simulate the non-deterministic behavior of a lid driven cavity flow under the influence of uncertainties. The driven velocity and fluid viscosity were supposed respectively to be the uncertain variable which has Gaussian probability distribution. Based on the validation with benchmark results,discussions were mainly focused on the statistic properties of velocity distribution. The results indicated the effect of IPC method on the simulation of propagation of uncertainty in the flow field. For the simulated results of 2D cavity flow,influence of the driven velocity uncertainty is larger than that of viscosity. | WANG XiaoDong1,2 & KANG Shun1 1 Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China 2 Department of Mechanical Engineering, Vrije Universiteit Brussel, Brussels 1050, Belgium | 2010 | Science China(Technological Sciences)2010，53，10： | 9 |
| 3 | Random Vibration Analysis of the Electronic Equipment Cabinet显示文摘In order to understand the vibration characteristic of system structure of electronic equipment cabinet within the particular vibration frequency,the finite element analysis software-ANSYS is used to simulate the tests of random vibrations of the cabinet system and obtain the isopleths graph of deformation and stress of the cabinet.It can confirm maximum of deformation and stress of the cabinet and position happened.Through more analysis of the frequency response curve,which can confirm harm- ful consequences random vibrations caused and weak link of the cabinet structure.The numerical simulation results are in good a- greement with the experimental results.It shows that this research provides an efficient method for the anti-seismic design and the dynamic optimization design. | LIU Yanping~1 LIU Dongqing~2 1.Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education,North China Electric Power University,Beijing 102206 ,China 2.Beijing University of Science and Technology,Beijing 100083,China | 2006 | 武汉理工大学学报2006，28，S2： | 3 |
| 4 | Spatial and temporal analysis of beta diversity in the Barro Colorado Island forest dynamics plot, Panama显示文摘Background: Ecologists are interested in assessing the spatial and temporal variation in ecological surveys repeated over time. This paper compares the 1985 and 2015 surveys of the Barro Colorado Forest Dynamics plot(BCI), Panama,divided into 1250(20 m × 20 m) quadrats.Methods, spatial analysis: Total beta diversity was measured as the total variance of the Hellinger-transformed community data throughout the BCI plot. Total beta was partitioned into contributions of individual sites(LCBD indices), which were tested for significance and mapped.Results, spatial analysis: LCBD indices indicated the sites with exceptional community composition. In 1985,they were mostly found in the swamp habitat. In the 2015 survey, none of the swamp quadrats had significant LCBDs.What happened to the tree community in the interval?Methods, temporal analysis: The dissimilarity in community composition in each quadrat was measured between time 1(1985) and time 2(2015). Temporal Beta Indices(TBI) were computed from abundance and presence-absence data and tested for significance. TBI indices can be decomposed into B = species(or abundances-per-species) losses and C = species(or abundances-per-species) gains. B-C plots were produced; they display visually the relative importance of the loss and gain components, through time, across the sites.Results, temporal analysis: In BCI, quadrats with significant TBI indices were found in the swamp area, which is shrinking in importance due to changes to the local climate. A published habitat classification divided the BCI forest plot into six habitat zones. Graphs of the B and C components were produced for each habitat group. Group 4(the swamp) was dominated by species(and abundances-per-species) gains whereas the five other habitat groups were dominated by losses, some groups more than others.Conclusions: We identified the species that had changed the most in abundances in the swamp between T1 and T2.This analysis supported the hypothesis that the swamp is drying out and is invaded by species from the surrounding area. Analysis of the B and C components of temporal beta diversity bring us to the heart of the mechanisms of community change through time: losses(B) and gains(C) of species, losses and gains of individuals of various species. TBI analysis is especially interesting in species-rich communities where we cannot examine the changes in every species individually. | Pierre Legendre Richard Condit | 2019 | Forest Ecosystems2019，6，1： | 2 |
| 5 | Demographic trends and climate over 35 years in the Barro Colorado 50 ha plot显示文摘Background:The first three censuses of the 50-ha plot at Barro Colorado Island spanned an unusually harsh dry season during the 1983 El Nino.By the early 1990 s,we had documented increases in tree mortality,tree growth,and large population fluctuations of many species during the 1982-1985 census interval.At the time,we asserted that increasing drought frequency would greatly affect the forest.With the benefit of five more censuses at Barro Colorado from 1995-2015,we can now put the 1980 conditions in a longer perspective and test the hypothesis that increasing droughtiness has continued to change the forest.Methods:A 50-ha forest plot on Barro Colorado Island was censused eight times,in 1982 and every five years since1985.All free-standing woody stems were measured,mapped,and identified In each census.Results:1) The period 1982-1992 included several extreme dry seasons,not just 1983,but since then there have been few such droughts.2) Dbh growth declined from a peak in the early 1980 s to its lowest in the early 1990 s.From 1995-2015 it increased slightly,but not returning to the initial peak.Nearly every species and all dbh categories followed the same pattern.3) The elevated stand-wide mortality rate of large trees during the 1982-1985 drought has not returned,and most individual species showed the same pattern of elevated mortality in the 1980 s followed by low and fairly stable mortality after 1990.4) Sapling mortality declined after 1985,but rose again in the late-90 s,so the 1980 s drought period no longer looks unusual.Mortality of individual species' saplings fluctuated erratically,including cases where mortality during the drought was lower than after.5) Population sizes of individual species fluctuated in all possible directions.Some species declined precipitously during the drought,then recovered,but others did not recover.Other species increased in abundance during the drought.Conclusions:Droughts of the 1980 s elevated tree growth and mortality at Barro Colorado,but since 1990,demographic rates have remained lower,paralleling a moderate climate with few severe droughts after 1990.Moisture-demanding species suffered during the drought,but many have since recovered.We do not know how often such drought periods recur.Moreover,many species' abundances fluctuated over 35 years with no known cause. | Richard Condit Rolando Pérez Suzanne Lao Salomón Aguilar Stephen P. Hubbell | 2017 | Forest Ecosystems2017，4，4： | 2 |
| 6 | Operation Performance of Central Solar Heating System with Seasonal Storage Water Tank in Harbin显示文摘This paper presented a preliminary research on the central solar heating system with seasonal storage(CSHSSS)used in cold climate in China.A mathematical model of the solar energy seasonal storage water tank used in the central solar heating system was firstly developed based on energy conservation.This was followed by the simulation of the CSHSSS used in a two-floor villa in Harbin,and analysis of the impacts on storage water temperature of tank volume,solar collector area,tank burial depth,insulation thickness around the tank,etc.The results show there is a relatively economical tank volume to optimize the system efficiency,which decreases with increasing tank volume at the constant collector area,and increases with increasing collector area at the constant tank volume.Furthermore,the insulation thickness has obvious effect on avoiding heat loss,while the tank burial depth doesn't.In addition,the relationship between the solar collector efficiency and storage water temperature is also obtained,it decreases quickly with increasing storing water temperature,and then increases slowly after starting space heating system.These may be helpful for relevant design and optimization in cold climates in China and all over the world. | YE Ling1,JIANG Yi-qiang1,YAO Yang1,ZHANG Shi-cong2(1.Institute of Heat Pump and Air Conditioning Technology,Harbin Institute of Technology,Harbin,Heilongjiang 150090,China 2.Institute of Built Environment and Energy Efficiency,China Academy of Building Research,Beijing 100013,China) | 2009 | 湖南大学学报(自然科学版)2009，36，S1： | 2 |
| 7 | The importance of demographic niches to tree diversity显示文摘 | Condit R Ashton P S Bunyavejehewin S | 2006 | Science2006，313，5783： | 1 |
| 8 | Spatial patterns in the distribution of tropical tree species 显示文摘 | Condit R Ashton P S Baker P | 2000 | Science2000，288，5470： | 1 |
| 9 | Tetrahedort Lett显示文摘 | Peng j Deng Y Ionic liquids catalyze Bcckmann reaction under solvent-free condition | 2001 | 42: 403 - 4052001，42，： | 1 |
| 10 | Can J Microbiol 显示文摘 | Guerin-Laguette A Plassard C Mousain D Effects of experimental conditions on mycorrhizal relationships between Pinus sylvestris and Lactarius deliciosus and unprecedented fruit-body formation of the Saffron milk cap under controlled soilless conditions | 2000 | 46 (9): 790-7992000，46，9： | 1 |
| 11 | Spatial and temporal variation of biomass in a tropical forest : results from a large census plot in Panama 显示文摘 | CHAVE J R CONDIT S LAO | 2003 | Journal of Ecology2003，91，2： | 1 |
| 12 | Its stabilization by hypoxia depends on redox-induced changes显示文摘 | Salceda S Carol Hypoxia-inducible factor lalpha (HIF- lalpha) protein is rapidly degraded by the ubiquitin- proteasome system under normoxie conditions | 1999 | J Biol chem1999，272，22： | 1 |
| 13 | Beta3-adrenoreceptor stimulation ameliorates myocardial ischemia-reperfusion injury via endothelial nitric oxide synthase and neuronal nitric oxide synthase activation显示文摘 | ARAGON J P CONDIT M E BHUSHAN S | 2011 | J Am Coll Cardiol2011，58，25： | 1 |
| 14 | High-pressure and high-tem-perature synthesis of MgB_2 and its superconductivity显示文摘The single-phase sample of MgB2 was prepared successfully at the temperature of 900℃ and under the pressure of 3 GPa. The structure of the sample was investigated using powder X-ray diffraction and Rietveld analysis. The results show that the structure of the sample belongs to the hexagonal structure with space group of P6/mmm, a=3.0861(5) A, c=3.5222(8) A. The magnetic and resistance measurements indicate that the superconducting transition temperature Tc is 39 K. | ZHU Jialin, LI Shaochun, YU Richeng, LI Fengying LIU Zhengxing & JIN ChangqingLaboratory for Extreme Condition Physics, Institute of Physics, Center for Condensed Matter Physcis and Beijing High Pressure Research Center, Chinese Academy of Sciences, Beijing 100080, China | 2001 | Chinese Science Bulletin2001，46，22： | 1 |
| 15 | Gap-dependent recruitment,realized vital rates, and size distributions of tropical trees显示文摘 | WRIGHT S J MULLER-LANDAU H C CONDIT R | 2003 | Ecology2003，84，： | 1 |
| 16 | Rarity and abundance in a diverse African forest显示文摘 | Kenfack D Thomas DW Ghuyong G Condit R | | 0，，： | 1 |
| 17 | Chronic obstructive pulmonary disease:national clinical guideline on management of chronic obstructive pulmonary disease in adult s in primary and secondary care显示文摘 | National Collaborating Centre for Chronic Conditions | 2004 | Thorax2004，59，1： | 1 |
| 18 | Research in large, long- term tropical forest plots 显示文摘 | Condit R | 1995 | Trends in Ecology&Evolution1995，10，： | 1 |
| 19 | The spectral reflectance of American soils显示文摘 | Condit H R | 1970 | Photogrammetric Engineering1970，36，： | 1 |
| 20 | Treatment of postconcussion syndrome following mild head injury 显示文摘 | MITrENBERG W CANYOCK EM CONDIT D | 2001 | J Clin Exp Neuropsychol2001，23，6： | 1 |
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