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Search Results: 1 - 10 of 1869 matches for " Yuduan Ou "
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Dynamics ofdominant tree seedlings in montane evergreen broadleaved forest following a snow disaster in North Guangdong

OU Yuduan,SU Zhiyao,XIE Dandan,KE Xiandong,LI Zhenkui,

生态学报 , 2011,
Abstract: Effects of a snowstorm on forest disturbance and the canopy changes caused by forest rehabilitation resulted in changes in tree seedling composition.The species and number of tree seedlings vary with the canopy-density dynamics and are embodied in the future species composition and structure of tree layer.With the aim of revealing the seedling regeneration pattern and its response to canopy changes(as indicated by changes in leaf area index \),a 3-year investigation from 2008 to 2010 was undertaken in Cheba...
Soil arthropod diversity following an ice storm in a montane evergreen broadleaved forest in Chebaling National Nature Reserve, China

Yuduan Ou,Zhiyao Su,Zhenkui Li,Fuchun Tong,Zexin Liu,

生物多样性 , 2009,
Abstract: In 2008, an ice storm caused extensive damage to the montane evergreen broadleaved forest in Chebaling National Nature Reserve, Guangdong Province, China. To assess the response of soil arthropod diversity and distribution to a gradient of canopy openness following the ice storm, 17 plots, each 400 m~2, were selected within a 2-ha permanent plot. Canopy openness was estimated with hemispherical photography in each plot. We sampled the litter layer and two soil layers (0-10 cm and 10-20 cm) to measure arthropod diversity and soil properties. We used two-way cluster analysis to group sites based on arthropod abundance in the litter layer. We also utilized canonical correspondence analysis to reveal relationships between soil arthropods in the 0-10 cm layer and four environmental variables, i.e., canopy openness (CO), soil organic matter (SOM), electric conductivity (EC), and natural moisture content (NMC). Results showed that abundance, richness and diversity of arthropod communities decreased with depth. A negative association was found between canopy openness and the number of arthropod groups in the litter layer; some arthropod taxa, such as the Oribatida, Prostigmata and Mesostigmata, were found in a wide range of light conditions, whereas the Hymenoptera, Symphyla, Pseudoscorpiones and Lepidoptera larvae may be photophobic. The distribution of arthropods in the 0-10 cm soil layer was closely related to CO, SOM, EC, and NMC on the first and second canonical axes. Hence, a series of changes in canopy structure and soil factors following the ice storm appeared to have affected the composition and distribution of soil arthropod communities. Findings from the present study also indicated that arthropod communities could serve as indicators to characterize the ecosystems they inhabit, thus being particularly suitable for monitoring forest regeneration and successional dynamics following ice storms.
Secondary pollution from sediment and red tide occurrence
Chen Cimei,Li Yueling,Wu Yuduan,
Chen Cimei
,Li Yueling,Wu Yuduan

环境科学学报(英文版) , 1995,
Abstract: The laboratory simulation study on the micro-bio element(MBE)released from polluted taliment in municipal sewage disposal area in Xiamen Harbor during to the changes of environmental parameters are presented in this paper. The red tide organisms was incubated in the sediment leaching solution,The effect of released MBE from sediment on the growth of phytopIankton was also estimated. The results showed that the MBE releatal from pollution sediment-secondary pollution would be able to induce red tide to breakout.
Does Benefit Relationship Affect Analysts’ Earnings Forecast?—Evidence from Chinese Stock Market  [PDF]
Yinlin Ou
Open Journal of Accounting (OJAcct) , 2017, DOI: 10.4236/ojacct.2017.62003
Abstract: Under the information asymmetrical theory, the Chinese securities analysts are affected by many benefit factors, so the purpose of the study is trying to figure out what benefit elements and how to affect analysts’ earnings forecasts. Using data from 2012 to 2015, the author creatively quantifies interest factors, and does the empirical analysis. Regression results indicate that the closer relationship between securities analysts and the listed companies management or institutional investors, the greater accuracy of their earnings forecasts. Besides, analysts’ reputation exists a negative correlation between earnings forecasts accuracy. Furthermore, securities’ underwriting relationships have no significant influence on the accuracy of analysts’ earnings forecasts, but the underwriting analysts are more likely to overestimate earnings per share of the target companies.
空间科学学报 , 2010,
Abstract: Thispaper,usingthedataofthreeClustersatellites,comparestheobservationsofBurstyBulkFlow(BBF)bysinglesatellitewiththosebymultisatellites.TheresultsindicatethatthereexistsremarkabledifferencebetweenobservationsofBBFbysinglesatelliteandmultisatellites.TheobservationsofBBFbyasinglesatellitedependonitspositionrelativetotheflowchannel.Thedifferenceiscausedbythelocalizationcharacteristicsoffastflowsintheplasmasheet,andcanleadtodivergingviewsaboutsubstormandcausalrelationsamongsubstormphenomena.
Dust Effect on the Performance of Wind Turbine Airfoils  [PDF]
Nianxin Ren, Jinping Ou
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2009, DOI: 10.4236/jemaa.2009.12016
Abstract: The full two-dimensional Navier-Stokes algorithm and the SST k-? turbulence model were used to investigate incom-pressible viscous flow past the wind turbine two-dimensional airfoil under clean and roughness surface conditions. The NACA 63-430 airfoil is chosen to be the subject, which is widely used in wind turbine airfoil and generally located at mid-span of the blade with thickness to chord length ratio of about 0.3. The numerical simulation of the airfoil under clean surface condition has been done. As a result, the numerical results had a good consistency with the experimental data. The wind turbine blade surface dust accumulation according to the operational periods in natural environment has been taken into consideration. Then, the lift coefficients and the drag coefficients of NACA 63-430 airfoil have been computed under different roughness heights, different roughness areas and different roughness locations. The role that roughness plays in promoting premature transition to turbulence and flow separation has been verified by the numeri-cal results. The trends of the lift coefficients and the drag coefficients with the roughness height and roughness area increasing have been obtained. What’s more, the critical values of roughness height, roughness area, and roughness location have been proposed. Furthermore, the performance of the airfoil under different operational periods has been simulated, and an advice for the period of cleaning wind turbine blades is proposed. As a result, the numerical simula-tion method has been verified to be economically available for investigation of the dust effect on wind turbine airfoils.
Anti-Money Laundering Regulation of China’s Mobile Payment and Settlement Industry  [PDF]
Yanwei Wang, Yangchao Ou
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.311033
Abstract: In recent years, with the continuous advance of payment equipment and technologies like China’s internet Finance, Big Data and Mobile Network, the anonymity, rapidity and cross-border transaction of mobile payment business have also brought many money laundering risks. Therefore, it is necessary to strengthen cooperation with the supervision organization of international payment and anti-money laundering business, and meanwhile to constantly improve the supervision mechanism of China’s payment and anti-money laundering business.
The Effect of Graphene/Ag Nanoparticles Addition on the Performances of Organic Solar Cells  [PDF]
Cheng Fang Ou
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.312006

Graphene/Ag nanoparticles (GAg) were fabricated via a facile method, employing graphite oxide as a precursor of graphene sheet (GNS), AgNO3 as a precursor of Ag nanoparticles, and sodium citrate as a reducing and stabilizing agent. We synthesized three kinds of GAg as GAg-1, GAg-2 and GAg-3. We introduced high electron mobility GAg into the active layer of polymer solar cell. The cell structure was ITO/PEDOT:PSS/P3HT:PCBM:GAg/Ca/Al. The weight ratio of P3HT:PCBM:GAg of active layer is 1:1:0.01. We study the effect of GAg addition on the photovoltaic performance. We use the UV-Vis, SPM, FE-SEM and solar simulator to measure the absorbance, roughness, surface morphology, and power conversion efficiency (PCE), respectively. From these results, we found that the fill factor (FF) and PCE of the cells with GNS or GAg are always higher than those of cell without GNS or GAg. The cell with GAg-2 had the highest short circuit current density (Jsc) of 8.56 mA/cm2, an increase of 20.2%, the highest fill factor (FF) of 0.56, an increase of 14.3% and the highest PCE of 2.78%. This is a 24.7% increase in efficiency compared to the cell without GNS or GAg. These improvements were due to the high carrier mobility of grapheme.

Local Solutions to a Class of Parabolic System Related to the P-Laplacian  [PDF]
Qitong Ou, Huashui Zhan
Advances in Pure Mathematics (APM) , 2016, DOI: 10.4236/apm.2016.612065
Abstract: In this paper, the existence and uniqueness of local solutions to the initial and boundary value problem of a class of parabolic system related to the p-Laplacian are studied. The regularization method is used to construct a sequence of approximation solutions, with the help of monotone iteration technique, then we get the existence of solution of a regularized system. By the use of a standard limiting process, the existence of the local solutions of the system is obtained. Finally, the uniqueness of the solution is also proven.
Governance, Corruption, and the Informal Economy  [PDF]
Idrissa M. Ouédraogo
Modern Economy (ME) , 2017, DOI: 10.4236/me.2017.82018
Abstract: This paper uses data from 23 Sub-Saharan countries to analyze the relationship between governance, corruption, and the size of the informal economy. The results show that corruption, the quality of governance, the quality of institutional settings, and the unemployment rates are major determinants of the size of the informal economy. More specifically, it is found that a high level of corruption and poor institutional settings favor an increase of the informal economy. The unemployment rate is negatively related to the size of the informal economy, and greater fiscal freedom and business freedom are associated with a larger informal economy, while monetary freedom reduces the size of the informal sector.
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