期刊文献+
共找到10篇文章
< 1 >
每页显示 20 50 100
Algorithm for cavity flow in a new-born goaf and experimental verification 被引量:1
1
作者 Jian Liu qichao zhou +2 位作者 Dong Wang Lijun Deng Ke Gao 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第3期351-361,共11页
Prevention and control measures of spontaneous combustion of coal and gas accumulation in a goaf require an accurate description of its gas flow state.However,the commonly used fluid dynamics in porous media is not su... Prevention and control measures of spontaneous combustion of coal and gas accumulation in a goaf require an accurate description of its gas flow state.However,the commonly used fluid dynamics in porous media is not suitable for the new-born goaf with fracture cavity combination,multi-scale,and large blocks.In this study,we propose a cavity flow algorithm to accurately describe the gas flow state in the new-born goaf.The genetic algorithm(GA)is used to randomly generate the binary matrix of a goaf caving shape.The difference between the gas flow state calculated by the lattice Boltzmann method(LBM)and the measured data at the boundary or internal measuring points of the real goaf is taken as the GA fitness value,and the real goaf caving shape and the gas flow state are quickly addressed by GA.The experimental model of new-born goaf is established,and the laser Doppler anemometry(LDA)experiment is carried out.The results show that the Jaccard similarity coefficient between the reconstructed caving shape and the real caving shape is 0.7473,the mean square error between the calculated wind speed and the LDA-measured value is 0.0244,and the R2 coefficient is 0.8986,which verify the feasibility of the algorithm. 展开更多
关键词 Cavity flow Lattice Boltzmann method Laser Doppler anemometry New-born goaf Genetic algorithm
下载PDF
Host Re-identification of Cyanophage PP and Its Implications for Host Range and Specificity 被引量:2
2
作者 qichao zhou Nian Wei +1 位作者 Lingling Zheng Lirong Song 《Virologica Sinica》 SCIE CAS CSCD 2013年第5期306-308,共3页
Dear Editor,In this study,we re-identified the hosts of cyanophage PP.Twenty-three candidate algal strains were tested,and the results indicated that seven strains belonging to Plectonema and Phormidium are the hosts ... Dear Editor,In this study,we re-identified the hosts of cyanophage PP.Twenty-three candidate algal strains were tested,and the results indicated that seven strains belonging to Plectonema and Phormidium are the hosts of cyanophage PP,including two previously reported filamentous cyanobacteria,Plectonema boryanum and Phormidium 展开更多
关键词 噬藻体 PP 寄主范围 异性 鉴定 机重 丝状蓝藻 宿主范围
下载PDF
Optical measurements of dissolved organic matter as proxies for COD_(Mn)and BOD_(5)in plateau lakes
3
作者 Xuan Yang Yongqiang zhou +6 位作者 Xiaoying Yang Yunlin Zhang Robert G.M.Spencer Justin D.Brookes Erik Jeppesen Hucai Zhang qichao zhou 《Environmental Science and Ecotechnology》 SCIE 2024年第3期132-138,共7页
The presence of organic matter in lakes profoundly impacts drinking water supplies,yet treatment processes involving coagulants and disinfectants can yield carcinogenic disinfection by-products.Traditional assessments... The presence of organic matter in lakes profoundly impacts drinking water supplies,yet treatment processes involving coagulants and disinfectants can yield carcinogenic disinfection by-products.Traditional assessments of organic matter,such as chemical oxygen demand(COD_(Mn))and biochemical oxygen demand(BOD_(5)),are often time-consuming.Alternatively,optical measurements of dissolved organic matter(DOM)offer a rapid and reliable means of obtaining organic matter composition data.Here we employed DOM optical measurements in conjunction with parallel factor analysis to scrutinize COD_(Mn)and BOD_(5)variability.Validation was performed using an independent dataset encompassing six lakes on the Yungui Plateau from 2014 to 2016(n=256).Leveraging multiple linear regressions(MLRs)applied to DOM absorbance at 254 nm(a254)and fluorescence components C1-C5,we successfully traced COD_(Mn)and BOD_(5)variations across the entire plateau(68 lakes,n=271,R^(2)>0.8,P<0.0001).Notably,DOM optical indices yielded superior estimates(higher R^(2))of COD_(Mn)and BOD_(5)during the rainy season compared to the dry season and demonstrated increased accuracy(R^(2)>0.9)in mesotrophic lakes compared to oligotrophic and eutrophic lakes.This study underscores the utility of MLR-based DOM indices for inferring COD_(Mn)and BOD_(5)variability in plateau lakes and highlights the potential of integrating in situ and remote sensing platforms for water pollution early warning. 展开更多
关键词 Dissolved organic matter Chemical oxygen demand Biochemical oxygen demand Water quality Yungui plateau lakes
原文传递
Corrigendum to“Optical measurements of dissolved organic matter as proxies for COD_(Mn)and BOD_(5)in plateau lakes”[Environ.Sci.Ecotech.19(2024)100326]
4
作者 Xuan Yang Yongqiang zhou +6 位作者 Xiaoying Yang Yunlin Zhang Robert G.M.Spencer Justin D.Brookes Erik Jeppesen Hucai Zhang qichao zhou 《Environmental Science and Ecotechnology》 SCIE 2024年第3期140-140,共1页
The authors regret that the following statements in the original article were wrong and have been corrected.The authors would like to apologise for any inconvenience caused.
关键词 PLATEAU dissolved WRONG
原文传递
Corrigendum to“Optical measurements of dissolved organic matter as proxies for COD_(Mn)and BOD_(5)in plateau lakes”[Environ.Sci.Ecotech.19(2024)100326]
5
作者 Xuan Yang Yongqiang zhou +6 位作者 Xiaoying Yang Yunlin Zhang Robert G.M.Spencer Justin D.Brookes Erik Jeppesen Hucai Zhang qichao zhou 《Environmental Science and Ecotechnology》 SCIE 2024年第4期341-341,共1页
The authors regret that the following statements in the original article were wrong and have been corrected.The authors would like to apologise for any inconvenience caused.
关键词 PLATEAU dissolved WRONG
原文传递
Improved Pigeon-Inspired Optimization in an Integrated Obstacle Avoidance Method for Mars UAV Formation 被引量:1
6
作者 Teng Liao Boyi Chen +1 位作者 qichao zhou Yanbin Liu 《Guidance, Navigation and Control》 2023年第1期117-136,共20页
This paper models the Mars UAV formation exploring the surface of Mars,and then the formation obstacle avoidance is brought up with the assumptions of the Mars circumstance and the UAVs.Based on their specialty,constr... This paper models the Mars UAV formation exploring the surface of Mars,and then the formation obstacle avoidance is brought up with the assumptions of the Mars circumstance and the UAVs.Based on their specialty,constrained Delaunay triangulation,Yen-K shortest path algorithm,the collaborative function,and the improved pigeon-inspired optimization(PIO)algorithm are integrated to solve the obstacle avoidance for the formation.Since the steering maneuver costs much energy and increases instabilities vulnerable in extraterrestrial exploration,the paper focuses on the route smoothness problem.The PIO is improved to be suitable for smooth routes and is compatible with other PIO variants.The simulation results show that the sum of the steering angle,namely the performance index,is e®ectively reduced and satises the obstacle avoidance requirements for Mars UAV formation. 展开更多
关键词 Mars UAV route planning pigeon-inspired optimization(PIO)algorithm
下载PDF
Total nitrogen and community turnover determine phosphorus use efficiency of phytoplankton along nutrient gradients in plateau lakes
7
作者 Yun Zhang Hucai Zhang +2 位作者 Qi Liu Lizeng Duan qichao zhou 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2023年第2期699-711,共13页
Numerous studies support that biodiversity predict most to ecosystem functioning,but whether other factors display a more significant direct impact on ecosystem functioning than biodiversity remains to be studied.We i... Numerous studies support that biodiversity predict most to ecosystem functioning,but whether other factors display a more significant direct impact on ecosystem functioning than biodiversity remains to be studied.We investigated 398 samples of the phytoplankton phosphorus resource use efficiency(RUE_(P)=chlorophyll-a concentration/dissolved phosphate)across two seasons in nine plateau lakes in Yunnan Province,China.We identified the main contributors to phytoplankton RUEP and analyzed their potential influences on RUEP at different lake trophic states.The results showed that total nitrogen(TN)contributed the most to RUEP among the nine lakes,whereas community turnover(measured as community dissimilarity)explained the most to RUEP variation across the two seasons.Moreover,TN also influenced RUEP by affecting biodiversity.Species richness(SR),functional attribute diversity(FAD2),and dendrogram-based functional diversity(FDc)were positively correlated with RUEP in both seasons,while evenness was negatively correlated with RUEP at the end of the rainy season.We also found that the effects of biodiversity and turnover on RUEP depended on the lake trophic states.SR and FAD2 were positively correlated with RUEP in all three trophic states.Evenness showed a negative correlation with RUEP at the eutrophic and oligotrophic levels,but a positive correlation at themesotrophic level.Turnover had a negative influence on RUEP at the eutrophic level,but a positive influence at the mesotrophic and oligotrophic levels.Overall,our results suggested that multiple factors and nutrient states need to be considered when the ecosystem functioning predictors and the biodiversityecosystem functioning relationships are investigated. 展开更多
关键词 Community turnover BIODIVERSITY PHYTOPLANKTON Resource use efficiency Taxonomic diversity Total nitrogen
原文传递
Seasonal and spatial distributions of euphotic zone and longterm variations in water transparency in a clear oligotrophic Lake Fuxian, China 被引量:19
8
作者 qichao zhou Yunlin Zhang +4 位作者 Kaidi Li Licheng Huang Fengle Yang Yuanyang zhou Junjun Chang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第10期185-197,共13页
To assess the seasonal and spatial variations and long-term trends in water optical properties in Lake Fuxian, investigations based on field work in four seasons and a long-term analysis of data from 1980 to 2014 were... To assess the seasonal and spatial variations and long-term trends in water optical properties in Lake Fuxian, investigations based on field work in four seasons and a long-term analysis of data from 1980 to 2014 were conducted. The results show that there was no significant variation in the euphotic depth(Z(eu)) across the four seasons, and no significant correlations between Z(eu) and potential influencing factors in seasons other than summer, suggesting that the water itself may be a major factor regulating the Z(eu)in general. Nevertheless, significant differences in Z(eu) between the north region(NR) and the south region(SR) were observed in all seasonal tests except spring. This finding relates to a higher abundance of chromophoric dissolved organic matter(CDOM) in the NR due to runoff, especially in the rainy seasons(summer and autumn).CDOM and its terrigenous component had an important impact on Z(eu)in summer, with the highest precipitation, and impacts from suspended solids and non-algal particles were also found in the NR in summer. The Secchi disk depth in the lake decreased clearly over the years,with significantly negative correlations with the increasing permanganate index and air temperature, implying that organic contaminants(CDOM and/or phytoplankton) are important regulators of water transparency. We estimate that the combined effects of climate warming and changes in land use and land cover are also indirect regulating factors. These findings should be considered in the protection of Lake Fuxian, owing to the importance of light penetration in aquatic ecosystems. 展开更多
关键词 Photosynthetic active radiation Diffuse attenuation coefficient Euphotic depth Secchi disk depth Chromophoric dissolved organic MATTER Yunnan-Guizhou Plateau
原文传递
Influence of sunlight on the proliferation of cyanobacterial blooms and its potential applications in Lake Taihu, China 被引量:6
9
作者 qichao zhou Wei Chen +2 位作者 Kun Shan Lingling Zheng Lirong Song 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第3期626-635,共10页
To learn the relationship between sunlight intensity and cyanobacterial proliferations for the further control of the heavy blooms, enclosure experiment were conducted in Meiliang Bay, Lake Taihu by regulating the nat... To learn the relationship between sunlight intensity and cyanobacterial proliferations for the further control of the heavy blooms, enclosure experiment were conducted in Meiliang Bay, Lake Taihu by regulating the natural light intensities with different shading ratio (0% (full sunlight), 10%, 25%, 50% and 75% of original natural sunlight intensities) from September to November in 2010. The results indicated that phytoplankton biomass (mean) decreased significantly when the shading ratios reached 50% or more. Higher shading ratios (e.g. 75%) were very efficient in controlling the average and total cyanobacterialbloom biomass, while 50% shading ratio was proven very effective either in controlling the peak value of phytoplankton biomass or postponing the occurrence of cyanobacterial blooms in Lake Talhu. In addition, phytoplankton composition and photosynthesis efficiency were also affected by altering the shading ratios, and in turn, they might also act on phytoplankton growth. Based on the results from the present study, intermediate shading strategies such as regulation of water level or turbidity through the hydrology regulations would probably be an effective and efficient method in controlling cyanobacterial blooms in large and shallow lakes. 展开更多
关键词 light cyanobacterial bloomscontrol Lake Taihu enclosure experiment
原文传递
Simultaneous elimination of cyanotoxins and PCBs via mechanical collection of cyanobacterial blooms:An application of“green-bioadsorption concept”
10
作者 Wei Chen Yunlu Jia +2 位作者 Anyue Liu qichao zhou Lirong Song 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第7期118-126,共9页
In this study,the distribution,transfer and fate of both polychlorinated biphenyls(PCBs)and cyanotoxins via phytoplankton routes were systematically investigated in two Chinese lakes.Results indicated that PCB adsor... In this study,the distribution,transfer and fate of both polychlorinated biphenyls(PCBs)and cyanotoxins via phytoplankton routes were systematically investigated in two Chinese lakes.Results indicated that PCB adsorption/bioaccumulation dynamics has significantly positive correlations with the biomass of green alga and diatoms.Total lipid content of phytoplankton is the major factor that influences PCB adsorption/bioaccumulation.Cyanobacterial blooms with relatively lower lipid content could also absorb high amount of PCBs due to their high cell density in the water columns,and this process was proposed as major route for the transfer of PCBs in Chinese eutrophic freshwater.According to these findings,a novel route on fates of PCBs via phytoplankton and a green bioadsorption concept were proposed and confirmed.In the practice of mechanical collections of bloom biomass from Lake Taihu,cyanotoxin/cyanobacteria and PCBs were found to be removed simultaneously very efficiently followed this theory. 展开更多
关键词 Mechanical collection Cyanobacterial bloom PCBs Cyanotoxin Fate Green bioadsorption concept
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部