213 results on '"Rongrong Wan"'
Search Results
2. Three Gorges Dam Operations Affect the Carbon Dioxide Budget of a Large Downstream Connected Lake
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Xiaosong Zhao, Xingwang Fan, Timothy J. Griffis, Ke Xiao, Xiang Li, Yuanbo Liu, Xijun Lai, Rongrong Wan, and Tingting Li
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carbon dioxide sink ,lake ,three Gorges Dam ,Geophysics. Cosmic physics ,QC801-809 - Abstract
Abstract The effects of dams on carbon dioxide (CO2) fluxes in downstream lakes remain elusive. Here we combined eddy covariance observations and random forest models to examine multi‐decadal variations in CO2 fluxes in the Poyang Lake, the largest freshwater lake in China, and quantified the contribution of the Three Gorges Dam (TGD), the world's largest hydraulic project. We found the lake fluctuated between CO2 source and sink in 1961–2016, and tended to be CO2 sink in the post‐TGD period (2003–2016) when vegetation expanded early and spatially due to declining water level. TGD can explain approximately 6% of the total differences in annual CO2 fluxes, with major contributions in the impoundment period (up to 22% in middle September to October). The results show a positive side of operational major hydraulic projects on lake carbon sink, and probably caution the negative side of carbon release after dam removal.
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- 2023
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3. Spatiotemporal dynamics of lake wetland in the Wanjiang Plain of the Yangtze River basin, China during the recent century
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Lifang Dong, Rongrong Wan, Bing Li, Zhiqiang Tan, Su Yang, and Tao Zhang
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Floodplain lake wetland ,Spatiotemporal change ,Historical topographic map ,Long-term monitoring ,Driving forces ,Lake isolation ,Ecology ,QH540-549.5 - Abstract
Numerous floodplain lakes in the world have been shrinking and gradually transformed into semi-closed reservoirs under the control of sluices for the past century, which has led to substantial ecosystem services loss. In this study, historical topographic maps 1930s and 1970s and remote sensing images (1980s–2020s) are used to reconstruct the centennial evolution characteristics of typical lakes in the Central Yangtze Ecoregion, i.e., the Wanjiang lake group. Moreover, we focus on their driving factors from the perspective of sluice control and agricultural activities. Results showed that the lake wetland area in the Wanjiang Plain shrank remarkably in the 1930s–2020s, with an overall loss rate of 45.32 %, of which 84.19 % was mainly in the 1930s–1970s. The wetland loss was accompanied by the dispersion of large lakes, the extinction and newbirth of small lakes. The uneven distribution of the wetland loss in space led to the overall migration of the lakes to the Yangtze River. These results can be explained as follows: from the 1950s to the 1970s, sluices were built on waterways between 91.67 % of lakes and the Yangtze River for flood mitigation. The flood risk control further led to the surge of building state-owned farms and personal polders in the local area from the 1950s to the 1980s, which was the primary cause for the loss of lake wetlands and the regularization of lake shorelines. Since the 1980s, lake protection measures have promoted the restoration of wetlands and reduced the rate of lake shrinkage to a certain extent. Our findings can provide important guidance for the sustainable management and possible hydrological connectivity restoration project in the middle and lower reaches of the Yangtze River.
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- 2022
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4. Unraveling the Importance of the Yangtze River and Local Catchment on Water Level Variations of Poyang Lake (China) After the Three Gorges Dam Operation: Insights From Random Forest Modeling
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Bing Li, Guishan Yang, Rongrong Wan, Yanan Wang, Chen Xu, Dianchang Wang, and Chuang Mi
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water level fluctuations ,random forest ,partial dependence ,Poyang Lake ,TGD operation ,Science - Abstract
Investigating the contributions of the factors influencing lake water level and their related changes with regard to hydraulic facilities is vital for understanding the driving mechanism of water level variations under the manifold pressures from anthropogenic activities and climate change. In this study, a random forest (RF) model was used to investigate the changes of the relationship between water level and discharge of the Yangtze River and local tributaries in Poyang Lake, China, based on daily hydrological data from 1980 to 2018. The results indicated that RF exhibited robust capability for water level prediction in Poyang Lake, with average R2 of 0.95, 0.88, 0.92, and 0.94 for the dry, rising, wet, and recession seasons, respectively. Predictor importance analysis showed that the discharge of the Yangtze River had greater influence on the water level than the discharge of local tributaries except for the dry season in Poyang Lake, where the influence on the water level was evident with discharge less than 5,000 m3/s. The influence of the Yangtze River also showed a clear attenuation pattern as the distance from the outlet of the lake increased, where the water level was constantly regulated by the Yangtze River. In addition, the partial dependence plots also indicated that the Yangtze River discharge changes after the TGD operation have resulted in remarkable water level decreases in the wet and recession seasons, especially for the recession period. Meanwhile, a slight increase in water level was predicted under identical discharge of local catchment in the dry season, which was only concentrated in the outlet of the lake. This study indicated the RF model as a robust technique for water level predictions and attribution analysis under multiple temporal and spatial scales. Moreover, this study confirmed the uneven influences of the Yangtze River and local tributaries on water level across different seasons, gauging stations, and phases.
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- 2022
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5. Role of Flooding Patterns in the Biomass Production of Vegetation in a Typical Herbaceous Wetland, Poyang Lake Wetland, China
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Xue Dai, Zhongbo Yu, Guishan Yang, and Rongrong Wan
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end-of-season biomass ,inundation depth ,inundation duration ,flooding pattern ,wetland ,Three Gorges Dam ,Plant culture ,SB1-1110 - Abstract
Flooding is an important factor influencing the biomass production of vegetation in natural wetland ecosystems. However, how biomass production is linked to flooding patterns in wetland areas remains unclear. We utilized gauging station data, a digital elevation model, vegetation survey data, and a Landsat 8 image to study the effects of average inundation depth (AID) and inundation duration (IDU) of flooding on end-of-season biomass of vegetation in Poyang Lake wetland, in particular, after operation of Three Gorges Dam. The end-of-season biomass of wetland vegetation showed Gaussian distributions along both the AID and IDU gradients. The most favorable flooding conditions for biomass production of vegetation in the wetland had an AID ranging from 3.9 to 4.0 m and an IDU ranging from 39% to 41%. For sites with a lower AID ( 41%), the end-of-season biomass values were negatively related. After the operation of the Three Gorges Dam, flooding patterns characterized by AID and IDU of the Poyang Lake wetland were significantly alleviated, resulting in a mixed changing trend of vegetation biomass across the wetland. Compared with 1980–2002, the increase of end-of-season biomass in lower surfaces caused by the alleviated flooding pattern far exceeded the decrease of end-of-season biomass in higher surfaces, resulting in an end-of-season biomass increase of 1.0%–6.7% since 2003. These results improved our understanding of the production trends of vegetation in the wetland and provided additional scientific guidance for vegetation restoration and wetland management in similar wetlands.
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- 2020
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6. Mapping Aboveground Biomass of Four Typical Vegetation Types in the Poyang Lake Wetlands Based on Random Forest Modelling and Landsat Images
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Rongrong Wan, Peng Wang, Xiaolong Wang, Xin Yao, and Xue Dai
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aboveground biomass ,wetland vegetation ,random forest ,Landsat image ,Ramsar wetland ,Poyang Lake ,Plant culture ,SB1-1110 - Abstract
Wetland biomass is an important indicator of wetland ecosystem health. In this study, four dominant vegetation communities (Carex cinerascens, Phalaris arundinacea, Artemisia selengensis, and Miscanthus sacchariflorus) in the Poyang Lake wetland from 2010 to 2016 were classified from Landsat images using spectral information divergence (SID). We combined aboveground biomass (AGB) field measurements and remote sensing data to establish a suitable model for estimating wetland AGB in Poyang Lake, which is on the Ramsar Convention’s list of Wetlands of International Importance. The results showed that (1) overall, the classification accuracy for vegetation pixels across 5 years ranged from 59.1% to 73.7% and (2) the inter-annual and spatial variations in the AGB of the four vegetation types were clear. C. cinerascens had an average AGB density value of 1.28 kg m−2 in Poyang Lake from 2010 to 2016; M. sacchariflorus had the highest AGB density with an average value of 1.39 kg m−2; A. selengensis had almost the same level at 1.26 kg m−2; and P. arundinacea had the lowest AGB density at 0.64 kg m−2. This study provides useful experience for estimating carbon sequestration of vegetation in freshwater wetlands.
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- 2019
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7. Estimating Forest Aboveground Biomass Using Gaofen-1 Images, Sentinel-1 Images, and Machine Learning Algorithms: A Case Study of the Dabie Mountain Region, China
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Haoshuang Han, Rongrong Wan, and Bing Li
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forest aboveground biomass ,multi-source remote sensing ,machine learning algorithms ,random forest ,Dabie Mountain region ,Science - Abstract
Quantitatively mapping forest aboveground biomass (AGB) is of great significance for the study of terrestrial carbon storage and global carbon cycles, and remote sensing-based data are a valuable source of estimating forest AGB. In this study, we evaluated the potential of machine learning algorithms (MLAs) by integrating Gaofen-1 (GF1) images, Sentinel-1 (S1) images, and topographic data for AGB estimation in the Dabie Mountain region, China. Variables extracted from GF1 and S1 images and digital elevation model data from sample plots were used to explain the field AGB value variations. The prediction capability of stepwise multiple regression and three MLAs, i.e., support vector machine (SVM), random forest (RF), and backpropagation neural network were compared. The results showed that the RF model achieved the highest prediction accuracy (R2 = 0.70, RMSE = 16.26 t/ha), followed by the SVM model (R2 = 0.66, RMSE = 18.03 t/ha) for the testing datasets. Some variables extracted from the GF1 images (e.g., normalized differential vegetation index, band 1-blue, the mean texture feature of band 3-red with windows of 3 × 3), S1 images (e.g., vertical transmit-horizontal receive and vertical transmit-vertical receive backscatter coefficient), and altitude had strong correlations with field AGB values (p < 0.01). Among the explanatory variables in MLAs, variables extracted from GF1 made a greater contribution to estimating forest AGB than those derived from S1 images. These results indicate the potential of the RF model for evaluating forest AGB by combining GF1 and S1, and that it could provide a reference for biomass estimation using multi-source images.
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- 2021
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8. Comparison on soil organic carbon within two typical wetland areas along the vegetation gradient of Poyang Lake, China
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Xiaolong Wang, Ligang Xu, and Rongrong Wan
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poyang lake ,seasonal variation ,soil organic carbon ,vegetation community ,River, lake, and water-supply engineering (General) ,TC401-506 ,Physical geography ,GB3-5030 - Abstract
Poyang Lake is an important wetland with international significance in biodiversity conservation and local carbon cycle. A study was conducted to investigate the effects of vegetation communities on seasonal and spatial variations of soil organic carbon (SOC) and dissolved organic carbon (DOC) in two dominant wetlands (dish-shaped pit wetland and delta wetland) of Poyang Lake, China. Results revealed significant variations of SOC and DOC along the vegetation gradient. Maximum accumulation of SOC and DOC was produced in Phragmites community, and the minimum ones in Phalaris community both in spring and in autumn. In comparison with delta wetland, dish-shaped pit wetland obtained higher SOC within the same vegetation type, which indicated that soils of dish-shaped pit wetland had greater capacity to store carbon. Compared with SOC, DOC represented stronger seasonal variations with great increase in autumn, which suggested that DOC was more sensitive to hydrology processing. Furthermore, significant variations of SOC and DOC were closely related to vegetation biomass both in spring and in autumn. Moreover, elevation and gradient also affected the distributing pattern of organic carbon suggesting significant influence of topography characteristics on the carbon pool.
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- 2016
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9. Comparison of random forests and other statistical methods for the prediction of lake water level: a case study of the Poyang Lake in China
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Bing Li, Guishan Yang, Rongrong Wan, Xue Dai, and Yanhui Zhang
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artificial neural networks ,lake water level ,poyang lake ,random forests ,support vector regression ,variable importance analysis ,River, lake, and water-supply engineering (General) ,TC401-506 ,Physical geography ,GB3-5030 - Abstract
Modeling of hydrological time series is essential for sustainable development and management of lake water resources. This study aims to develop an efficient model for forecasting lake water level variations, exemplified by the Poyang Lake (China) case study. A random forests (RF) model was first applied and compared with artificial neural networks, support vector regression, and a linear model. Three scenarios were adopted to investigate the effect of time lag and previous water levels as model inputs for real-time forecasting. Variable importance was then analyzed to evaluate the influence of each predictor for water level variations. Results indicated that the RF model exhibits the best performance for daily forecasting in terms of root mean square error (RMSE) and coefficient of determination (R2). Moreover, the highest accuracy was achieved using discharge series at 4-day-ahead and the average water level over the previous week as model inputs, with an average RMSE of 0.25 m for five stations within the lake. In addition, the previous water level was the most efficient predictor for water level forecasting, followed by discharge from the Yangtze River. Based on the performance of the soft computing methods, RF can be calibrated to provide information or simulation scenarios for water management and decision-making.
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- 2016
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10. Quantifying the effects of channel change on the discharge diversion of Jingjiang Three Outlets after the operation of the Three Gorges Dam
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Yanyan Li, Guishan Yang, Bing Li, Rongrong Wan, Weili Duan, and Zheng He
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channel change ,discharge diversion ,jingjiang three outlets ,rating curve ,three gorges dam ,yangtze river ,River, lake, and water-supply engineering (General) ,TC401-506 ,Physical geography ,GB3-5030 - Abstract
The Jingjiang Three Outlets (JTO) are the water-sediment connecting channels between the Yangtze River and the Dongting Lake. The discharge diversion of the JTO plays a dominant role in the flood control of the middle–lower Yangtze River, Dongting Lake evolution, and ecological environment. After the operation of the Three Gorges Dam (TGD), the river channels downstream experienced dramatic channel changes. To study the influences of the channel change on the discharge diversion, the authors analyzed the channel changes by water level–discharge rating curves and cross-sectional channel profiles in 1980–2014. Hence, changes in the water level with the same discharge and the decline of discharge diversion at the JTO were noted. Channel incision caused the water level with the same discharge to greatly decrease in the upper Jingjiang River. The water level with the same discharge significantly increased at the JTO as a result of the channel deposition. The channel changes contributed approximately 37.74% and 76.36%, respectively, to the amount and ratio of discharge diversion decreases after the TGD operation. The channel changes serve as the primary factor in facilitating the decrease in the discharge diversion ratio, but not the main factor for the decreased amount of the discharge diversion.
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- 2016
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11. Lake hydrology, water quality and ecology impacts of altered river–lake interactions: advances in research on the middle Yangtze river
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Guishan Yang, Qi Zhang, Rongrong Wan, Xijun Lai, Xia Jiang, Ling Li, Huichao Dai, Guangchun Lei, Jianchi Chen, and Yongjun Lu
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dongting lake ,middle yangtze river ,poyang lake ,river–lake interaction ,three gorges dam ,River, lake, and water-supply engineering (General) ,TC401-506 ,Physical geography ,GB3-5030 - Abstract
Water and mass exchange between rivers and lakes are key processes that maintain the health of the ecology of river–lake systems. Alteration to river–lake interactions have great impacts on water and mass balances. Naturally connected to the middle Yangtze River are the Poyang Lake and Dongting Lake, which are the largest and the second largest freshwater lakes in China. The operation of the Three Gorges Dam (TGD) in the upper Yangtze River was found to have substantial impacts on the middle Yangtze river–lake system. In the past decade, unusual seasonal dryness was evident in the two lakes. Considerable deviations in lake water quality and wetland ecosystem were also detected. In order to explore and distinguish the causal factors influencing the river–lake system, the Ministry of Sciences and Technology (China) launched a research project in 2012, the National Basic Research Program of China (973 Program) (2012CB417000). This article provides an overview of advances in this research, including the evolution of the river–lake interactions, the impacts of the TGD, and the influences on lake hydrology, water quality, and ecosystem. The 20 papers in this issue deliver part of the research outcomes of this project.
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- 2016
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12. Aquatic Ecosystem Health Assessment of Poyang Lake through Extension Evaluation Method
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Yanhui Zhang, Hongyun Zhu, Bing Li, Guishan Yang, and Rongrong Wan
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aquatic ecosystem health assessment ,indicators ,thresholds ,extension evaluation method ,Poyang Lake ,Hydraulic engineering ,TC1-978 ,Water supply for domestic and industrial purposes ,TD201-500 - Abstract
Freshwater lakes encounter a series of problems, such as a decline in lake water quality, a sharp decrease in biodiversity, and ecological degradation. As such, lacustrine studies by highly skilled professionals and managers with water resources at home and abroad have focused on assessing the aquatic ecosystem health status of lakes. In this study, the health status of the aquatic ecosystem in the largest freshwater lake in China (Poyang Lake) was assessed, and its temporal and spatial characteristics were illustrated. The index contained three element layers, including hydrologic characteristics, trophic status, and aquatic organisms. The health status of the aquatic ecosystem was classified into three categories: ‘good’, ‘moderate’ (subhealthy), and ‘bad’. It was examined through extension evaluation method. Results showed ‘moderate’ health status, whereas remarkable seasonal and spatially variations. The annual changes in the health status were remarkably due to the influence of complex hydrological and hydrodynamic conditions. This study provides an overall understanding of the aquatic ecosystem evaluation in Poyang Lake. Such an understanding is vital for environmental conservation and identification of causes of the aquatic ecosystem degradation in Poyang Lake.
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- 2021
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13. Vegetation Carbon Sequestration Mapping in Herbaceous Wetlands by Using a MODIS EVI Time-Series Data Set: A Case in Poyang Lake Wetland, China
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Xue Dai, Guishan Yang, Desheng Liu, and Rongrong Wan
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herbaceous wetlands ,vegetation carbon sequestration ,enhanced vegetation index time series ,Poyang Lake wetland ,Science - Abstract
The carbon sequestration capacity of wetland vegetation determines carbon stocks and changes in wetlands. However, modeling vegetation carbon sequestration of herbaceous wetlands is still problematic due to complex hydroecological processes and rapidly changing biomass carbon stocks. Theoretically, a vegetation index (VI) time series can retrieve the dynamic of biomass carbon stocks and could be used to calculate the cumulative composite of biomass carbon stocks during a given interval, i.e., vegetation carbon sequestration. Hence, we explored the potential for mapping vegetation carbon sequestration in herbaceous wetlands in this study by using a combination of remotely sensed VI time series and field observation data. This method was exemplarily applied for Poyang Lake wetland in 2016 by using a 16-day Moderate Resolution Imaging Spectroradiometer (MODIS) enhanced vegetation index (EVI) time series. Results show that the vegetation carbon sequestration in this area was in the range of 193–1221 g C m−2 year−1 with a mean of 401 g C m−2 year−1 and a standard deviation of 172 g C m−2 year−1 in 2016. The approach has wider spatial applicability in wetlands than the currently used global map of vegetation production (MOD17A3) because our carbon estimation in areas depicted by ‘no data’ in the MOD17A3 product is considerable, which accounts for 91.2–91.5% of the total vegetation carbon sequestration of the wetland. Thus, we determined that VI time series data shows great potential for estimating vegetation carbon sequestration in herbaceous wetlands, especially with the continuously improving quality and frequency of satellite VI images.
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- 2020
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14. Influence of carbon nanotube on the tribological properties of vegetable-based oil
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Yu Su, Zhengcheng Tang, Guicheng Wang, and Rongrong Wan
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Mechanical engineering and machinery ,TJ1-1570 - Abstract
A pin-on-disk friction and wear tester was used to investigate the tribological properties of multi-walled carbon nanotubes with different sizes and volume fractions as LB2000 vegetable-based oil additive. The wear scar of disk was characterized using scanning electron microscopy and Raman spectroscopy. Furthermore, the lubrication mechanism of multi-walled carbon nanotubes as vegetable-based oil additive was also discussed. It was found that thin and short multi-walled carbon nanotubes could improve the friction-reducing and anti-wear properties of vegetable-based oil more effectively than thick and long multi-walled carbon nanotubes. The optimal volume fraction of thin and short multi-walled carbon nanotubes was found to be 0.05%.
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- 2018
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15. An investigation on the electrostatic atomization mode of nanofluid using cutting tool as electrode
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Yu Su, Zhengcheng Tang, and Rongrong Wan
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Mechanical engineering and machinery ,TJ1-1570 - Abstract
In this article, the electrostatic atomization experimental setup was designed and fabricated, and high-speed camera was used to observe and analyze the atomization modes of graphite water-based and oil-based nanofluid using cutting tool as electrode under different electrode voltages and distances, flow rates, and nozzle angles. Three-dimensional finite element simulations of the electrostatic field between nozzle and cutting tool were conducted using the software Ansoft Maxwell to investigate the effect of electrode voltage and nozzle angle on the electrostatic atomization mode. The results indicate that spindle mode is a suitable electrostatic atomization mode for cooling and lubricating the cutting edge. The nozzle angle with the largest electrostatic field intensity is presented so as to generate good break-up effect of jet in spindle mode. Furthermore, the operating range of spindle mode in terms of the electrode voltage and flow rate for graphite water-based and graphite oil-based nanofluid under the nozzle angle with the largest electrostatic field intensity is achieved. The outcome of this study is helpful for further development of electrostatic atomization cutting technique.
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- 2017
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16. Spatiotemporal Variability in the Water Quality of Poyang Lake and Its Associated Responses to Hydrological Conditions
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Bing Li, Guishan Yang, Rongrong Wan, Yanhui Zhang, Xue Dai, and Yuwei Chen
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nutrient indicators ,water quality parameters ,water level fluctuations ,principal component analysis ,Poyang Lake ,Hydraulic engineering ,TC1-978 ,Water supply for domestic and industrial purposes ,TD201-500 - Abstract
Determining the spatiotemporal water quality patterns and their corresponding driving factors is crucial for lake water quality managements. This study analyzed hydrological data and concentrations of 11 water quality parameters, including total nitrogen, total phosphorus, ammonia nitrogen and chlorophyll–a (Chl–a), for water samples collected from 15 sampling sites between 2009 and 2014. The water quality of sites in the northern Poyang Lake–Yangtze River waterway was influenced by different environmental parameters compared to sites in central lake, especially for Chl–a concentration. All pollutant parameters were significantly higher in the river phase (water level 14 m) (p < 0.05). These results were confirmed via principal component analysis, which identified three principal components that explained over 79% of the dataset variance. Among all the parameters related to climatic factors, eutrophication and organic pollution were the most important contributors in water quality. Dilution was the controlling factor that drove the seasonal variability in the water quality of the Poyang Lake, China. This work further indicated that regulating pollutant effluents in tributaries and water level within the lake could improve the water quality in Poyang Lake, which may give some impetus for water quality management.
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- 2016
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17. Estimating Forest Aboveground Biomass Using Gaofen-1 Images, Sentinel-1 Images, and Machine Learning Algorithms: A Case Study of the Dabie Mountain Region, China.
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Haoshuang Han, Rongrong Wan, and Bing Li
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- 2022
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18. The aquatic ecological health-state assessment and the influencing mechanism of Poyang Lake
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Yanhui Zhang, Bing Li, Hongyun Zhu, Guishan Yang, Yongjiu Cai, Rongrong Wan, and Xiaolei Wang
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Ecology ,Aquatic Science ,Oceanography ,Ecology, Evolution, Behavior and Systematics - Published
- 2023
19. Energy-water-climate governance from interdisciplinary perspectives
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Rongrong, Wan and Meng, Ni
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Conservation of Natural Resources ,Climate ,Climate Change ,Health, Toxicology and Mutagenesis ,Water ,Environmental Chemistry ,General Medicine ,Pollution - Published
- 2022
20. Reassessment of the declines in the largest freshwater lake in China (Poyang Lake): uneven trends, risks and underlying causes
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Bing Li, Guishan Yang, and Rongrong Wan
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Environmental Engineering ,General Medicine ,Management, Monitoring, Policy and Law ,Waste Management and Disposal - Published
- 2023
21. Optimizing payment for ecosystem services in a drinking water source watershed by quantifying the supply and demand of soil retention service
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Lei Tan, Guishan Yang, Qing Zhu, Rongrong Wan, and Kun Shi
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Environmental Engineering ,General Medicine ,Management, Monitoring, Policy and Law ,Waste Management and Disposal - Published
- 2023
22. Toward ecological function zoning and comparison to the Ecological Redline Policy: a case study in the Poyang Lake Region, China
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Rongrong Wan, Weixin Ou, Peng Wang, Guishan Yang, and Chen Xu
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China ,Conservation of Natural Resources ,geography ,Functional ecology ,geography.geographical_feature_category ,Land use ,Redline ,Ecology ,Health, Toxicology and Mutagenesis ,Wetland ,General Medicine ,010501 environmental sciences ,01 natural sciences ,Pollution ,Ecosystem services ,Lakes ,Policy ,Vulnerability assessment ,Humans ,Environmental Chemistry ,City Planning ,Zoning ,Ecosystem ,0105 earth and related environmental sciences - Abstract
Faced with huge environmental problems of ecosystem degradation, “Ecological Redline Policy (ERP)” in China is a new key national-level policy to manage different land use functions in accordance with development and environmental limits. As the water–land complex ecosystem with the largest freshwater lake, wetland natural reserves and ecological importance in China, Poyang Lake Region (PLR) is selected to quantify and map multiple ecosystem services, investigate the ecological function zoning as part of research on ecological zoning control and major ecological source areas to illustrate and address the implementation of this strategy based on the importance and vulnerability analysis of ecosystem services. According to ecological function zoning results, extremely important, highly important, medium important and important zones respectively account for 26.1%, 28.1%, 17.4% and 28.4% of the total area. With an area of 5422.2 km2, the extremely important zone is 1010.6 km2 larger than the ERP. Moreover, 81.6% of the ERP is located in the extremely important zone. By discussing the implications and applications of ecological management, this study contributes to the ecological protection of Poyang Lake and provides a foundation for research on ecological function zoning at the regional scale.
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- 2021
23. DNA methylation patterns in patients with asthenospermia and oligoasthenospermia
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Jingdi Zhang, Xiaogang Li, Rongrong Wang, Xinxin Feng, Siyu Wang, Hai Wang, Yutao Wang, Hongjun Li, Yongzhe Li, and Ye Guo
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Asthenospermia ,Oligoasthenospermia ,DNA methylation ,Sperm ,Biotechnology ,TP248.13-248.65 ,Genetics ,QH426-470 - Abstract
Abstract Background Spermatogenesis is a highly regulated and complex process in which DNA methylation plays a crucial role. This study aimed to explore the differential methylation profiles in sperm DNA between patients with asthenospermia (AS) and healthy controls (HCs), those with oligoasthenospermia (OAS) and HCs, and patients with AS and those with OAS. Results Semen samples and clinical data were collected from five patients with AS, five patients with OAS, and six age-matched HCs. Reduced representation bisulfite sequencing (RRBS) was performed to identify differentially methylated regions (DMRs) in sperm cells among the different types of patients and HCs. A total of 6520, 28,019, and 16,432 DMRs were detected between AS and HC, OAS and HC, and AS and OAS groups, respectively. These DMRs were predominantly located within gene bodies and mapped to 2868, 9296, and 9090 genes in the respective groups. Of note, 12, 9, and 8 DMRs in each group were closely associated with spermatogenesis and male infertility. Furthermore, BDNF, SMARCB1, PIK3CA, and DDX27; RBMX and SPATA17; ASZ1, CDH1, and CHDH were identified as strong differentially methylated candidate genes in each group, respectively. Meanwhile, the GO analysis of DMR-associated genes in the AS vs. HC groups revealed that protein binding, cytoplasm, and transcription (DNA-templated) were the most enriched terms in the biological process (BP), cellular component (CC), and molecular function (MF), respectively. Likewise, in both the OAS vs. HC and AS vs. OAS groups, GO analysis revealed protein binding, nucleus, and transcription (DNA-templated) as the most enriched terms in BP, CC, and MF, respectively. Finally, the KEGG analysis of DMR-annotated genes and these genes at promoters suggested that metabolic pathways were the most significantly associated across all three groups. Conclusions The current study results revealed distinctive sperm DNA methylation patterns in the AS vs. HC and OAS vs. HC groups, particularly between patients with AS and those with OAS. The identification of key genes associated with spermatogenesis and male infertility in addition to the differentially enriched metabolic pathways may contribute to uncovering the potential pathogenesis in different types of abnormal sperm parameters.
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- 2024
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24. Nobiletin alleviates cisplatin-induced ototoxicity via activating autophagy and inhibiting NRF2/GPX4-mediated ferroptosis
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Wenao Song, Li Zhang, Xiaolin Cui, Rongrong Wang, Jingyu Ma, Yue Xu, Yan Jin, Dawei Wang, and Zhiming Lu
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Medicine ,Science - Abstract
Abstract Nobiletin, a citrus polymethoxy flavonoid with antiapoptotic and antioxidative properties, could safeguard against cisplatin-induced nephrotoxicity and neurotoxicity. Cisplatin, as the pioneer of anti-cancer drug, the severe ototoxicity limits its clinical applications, while the effect of nobiletin on cisplatin-induced ototoxicity has not been identified. The current study investigated the alleviating effect of nobiletin on cisplatin-induced ototoxicity and the underlying mechanisms. Apoptosis and ROS formation were evaluated using the CCK-8 assay, Western blotting, and immunofluorescence, indicating that nobiletin attenuated cisplatin-induced apoptosis and oxidative stress. LC3B and SQSTM1/p62 were determined by Western blotting, qPCR, and immunofluorescence, indicating that nobiletin significantly activated autophagy. Nobiletin promoted the nuclear translocation of NRF2 and the transcription of its target genes, including Hmox1, Nqo1, and ferroptosis markers (Gpx4, Slc7a11, Fth, and Ftl), thereby inhibiting ferroptosis. Furthermore, RNA sequencing analysis verified that autophagy, ferroptosis, and the NRF2 signaling pathway served as crucial points for the protection of nobiletin against ototoxicity caused by cisplatin. Collectively, these results indicated, for the first time, that nobiletin alleviated cisplatin-elicited ototoxicity through suppressing apoptosis and oxidative stress, which were attributed to the activation of autophagy and the inhibition of NRF2/GPX4-mediated ferroptosis. Our study suggested that nobiletin could be a prospective agent for preventing cisplatin-induced hearing loss.
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- 2024
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25. Combining historical maps and landsat images to delineate the centennial-scale changes of lake wetlands in Taihu Lake Basin, China
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Su Yang, Rongrong Wan, Guishan Yang, Bing Li, and Lifang Dong
- Subjects
History ,Environmental Engineering ,Polymers and Plastics ,General Medicine ,Business and International Management ,Management, Monitoring, Policy and Law ,Waste Management and Disposal ,Industrial and Manufacturing Engineering - Abstract
Lake wetlands (LWs) are essential components of the ecosystem and play an irreplaceable role in flood regulation, carbon fixation, and biodiversity maintenance. Continuous monitoring of LWs' change is necessary in the context of increased human disturbance and climate change, particularly in Taihu Lake Basin, China, an area exposed to early human exploitation. Yet, long-time series of LWs detection in this region is still unavailable due to the data limitation. To quantify the spatiotemporal dynamics of LWs and the associated driving forces, we combined 236 historical topographic maps and thousands of Landsat satellite images from the 1910s to 2021 to delineate the centennial-scale changes of lake wetlands for the first time in this region. We also applied land use transitions and statistical analyses to quantitively explore the climatic and anthropogenic factors behind LWs variations. Our results document a dramatic decline in the area and number of LWs in the Taihu Lake Basin over the last century and a shift in the 2000s: Taihu Lake Basin has seen a total of 89.15% loss in lake littoral wetlands and a decrease of 14.5% in the whole lake wetlands area, with a net reduction of 68 (from 156 in the 1910s to 88 in the 2021) lakes. This decrease has been especially predominant during the 1910s-2000s, because of the policy initiatives for reclamation and aquacultural industries. The area and number of LWs have gradually been recovered since the 2000s as the country strengthened concern on the ecological restoration and sustainable development. The statistical results suggested that human activities played a dominant role in the LWs changes, with GDP and population explained 80.74% of the changes, coupled with climatic contribution of only around 20%. This long-term investigation will provide baseline information for future lake wetlands monitoring. Our findings could also provide a guidance for decision makers regarding water resources management, environmental protection and land-use planning in urban areas.
- Published
- 2023
26. Assessing the inundation dynamics and its impacts on habitat suitability in Poyang Lake based on integrating Landsat and MODIS observations
- Author
-
Shaojie Mu, Guishan Yang, Xibao Xu, Rongrong Wan, and Bing Li
- Subjects
China ,Lakes ,Environmental Engineering ,Environmental Chemistry ,Humans ,Water ,Hydrology ,Pollution ,Waste Management and Disposal ,Ecosystem ,Environmental Monitoring - Abstract
Poyang Lake, the largest freshwater lake in China, serves critical ecosystem function for water regulation and biodiversity conservation. However, it experienced dramatic changes in lake inundation due to recent climate change and human activities, causing ecological and economic problems. Here, we applied a multiple-index water detection rule to integrated Landsat and MODIS products to reconstruct surface water series at 30-m and 8-day resolutions and quantified the spatio-temporal inundation dynamics in Poyang Lake over the past 20 years (2000-2019). Furthermore, their influences on habitat suitability for herbivorous birds were also assessed from the perspectives of hydroperiod and vegetation growth threshold. The significant declining trend (-26.66 km
- Published
- 2022
27. Payment for Ecosystem Services Based on the Supply and Demand of Soil Retention Service in a Drinking Water Source Basin
- Author
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Lei TAN, Guishan Yang, Qing Zhu, Rongrong Wan, and Kun Shi
- Published
- 2022
28. Exosomal circ50547 as a potential marker and promotor of gastric cancer progression via miR-217/HNF1B axis
- Author
-
Xueyan Zang, Rongrong Wang, Ziyi Wang, Shuangyang Qiu, Fan Zhang, Le Zhou, Ye Shen, Hui Qian, Wenrong Xu, and Jiajia Jiang
- Subjects
Exosomes ,CircRNAs ,Gastric cancer ,miRNA ,Stem,Resistance ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Background: Exosomes, one of small extracellular vesicles, play a vital role in cell to cell communication and contribute to the advancement of tumors through their cargo molecules. Exosomal circRNAs have emerged as significant players in various types of tumors. Thus, this study aimed to investigate how exosomal circRNAs are involved in the diagnosis and progression of gastric cancer (GC). Methods: Serum exosomes were characterized using transmission electron microscopy, nanoparticle tracking analysis and Western blot. CCK-8, colony formation and transwell assays were conducted to study the function of hsa_circ_0050547 (named as circ50547). qRT-PCR was used to quantify the expression of circ50547 in GC tissues and serum exosomes. Fluorescence in situ hybridization was applied to detect the cellular distribution of circ50547. Stemness and drug-resistance were detected by sphere formation, WB, flow cytometry and half-maximal inhibitory concentration analyses. Bioinformatic analyses, luciferase experiments, qRT-PCR and WB were used to investigate molecular mechanisms. Results: We discovered for the first time a new type of GC-derived exosomal circRNA, circ50547. We found that circ50547 is highly expressed in both GC tissues and serum exosomes. Interestingly, we observed that the diagnostic value of exosomal circ50547 is superior to that of serum circ50547. Circ50547 overexpression enhanced the proliferation, migration, invasion, stemness and drug resistance of GC cells, while knockdown of circ50547 showed the opposite effect. Mechanistically, circ50547 acted as a sponge for miR-217 to regulate the expression of HNF1B, which promoted gastric cancer progression. Conclusion: Exosomal circ50547 may be a promising marker for the diagnosis and prognosis prediction of GC. These findings suggest that it plays an oncogenic role through miR-217/HNF1B signaling pathway in GC.
- Published
- 2024
- Full Text
- View/download PDF
29. CHANGE CHARACTERISTICS OF WATER EXCHANGE BETWEEN THE YANGTZE RIVER AND THE DONGTING LAKE DURING 1960–2018 IN CHINA
- Author
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Guishan Yang, Y.Y. Li, X.J. Lai, B. Li, and Rongrong Wan
- Subjects
Hydrology ,Yangtze river ,Environmental science ,Water exchange ,China ,Agronomy and Crop Science ,Ecology, Evolution, Behavior and Systematics - Published
- 2020
30. Chlorophyll a variations and responses to environmental stressors along hydrological connectivity gradients: Insights from a large floodplain lake
- Author
-
Bing Li, Guishan Yang, Rongrong Wan, and Ligang Xu
- Subjects
Chlorophyll ,China ,Lakes ,Health, Toxicology and Mutagenesis ,Chlorophyll A ,Phytoplankton ,Water ,General Medicine ,Eutrophication ,Hydrology ,Toxicology ,Pollution ,Environmental Monitoring - Abstract
Understanding the key drivers of eutrophication in floodplain lakes has long been a challenge. In this study, the Chlorophyll a (Chla) variations and associated relationships with environmental stressors along the temporal hydrological connectivity gradient were investigated using a 11-year dataset in a large floodplain lake (Poyang Lake). A geostatistical method was firstly used to calculate the hydrological connectivity curves for each sampling campaign that was further classified by K-means technique. Linear mixed effect (LME) models were developed through the inclusion of the site as a random effect to identify the limiting factors of Chla variations. The results identified three clear hydrological connectivity variation patterns with remarkable connecting water area changes in Poyang Lake. Furthermore, hydrological connectivity changes exerted a great influence on environmental variables in Poyang Lake, with a decrease in nutrient concentrations as the hydrological connectivity enhanced. The Chla exhibited contrast variations with nutrient variables along the temporal hydrological connectivity gradient and generally depended on WT, DO, EC and TP, for the entire study period. Nevertheless, the relative roles of nutrient and non-nutrient variables in phytoplankton growth varied with different degrees of hydrological connectivity as confirmed by the LME models. In the low hydrological connectivity phase, the Chla dynamics were controlled only by water temperature with sufficient nutrients available. In the high hydrological connectivity phase, the synergistic influences of both nutrient and physical variables jointly limited the Chla dynamics. In addition, a significant increasing trend was observed for Chla variations from 2008 to 2018 in the HHC phase, which could largely be attributed to the elevated nutrient concentrations. This study confirmed the strong influences of hydrological connectivity on the nutrient and non-nutrient limitation of phytoplankton growth in floodplain lakes. The present study could provide new insights on the driving mechanisms underlying phytoplankton growth in floodplain lakes.
- Published
- 2021
31. Soil Characteristics in Relation to Vegetation Communities in the Wetlands of Poyang Lake, China
- Author
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Xiaolong, Wang, Jingyi, Han, Ligang, Xu, Rongrong, Wan, and Yuwei, Chen
- Published
- 2014
- Full Text
- View/download PDF
32. Construction and Practice of Ideological and Political Elements in Blending Teaching of 'Principles of Food Technology' from the Perspective of OBE Concept
- Author
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Qingquan FU, Rongrong WANG, Ya PENG, Liuyan LÜ, and Shoujiang CHEN
- Subjects
curriculum ideological and political education ,principles of food technology ,the concept of obe ,blended teaching method ,construction ,practice ,Food processing and manufacture ,TP368-456 - Abstract
Curriculum ideological and political education is the fundamental task of implementing moral education and cultivating people in colleges and universities, and also the basic requirement for the development in the new era. The concept of OBE is results-oriented education, which is a reverse design education concept of 'output -oriented, student-centered, teacher-led organization and continuous improvement'. Principles of Food Technolog is the core course of food major, which plays a vital role in cultivating high-quality professionals in the food industry. Therefore, it is urgent for teachers to explore the ideological and political elements contained in the knowledge system and penetrate into each teaching link in the teaching process. Based on the characteristics of the course, teaching objectives and teaching content, this paper explores the ideological and political elements in each chapter deeply, and constructs such elements based on the concept of OBE and implements through the combination of online and offline teaching. The teaching of specialized courses and curriculum ideological and political education in the curriculum go in the same direction to achieve a synergistic effect. Through the construction and implementation of the ideological and political elements of the course, students would improve their sense of identity and professional ethics of food major, and form a correct world outlook, outlook on life and values. At the same time, the research results of the course were expected to provide appropriate reference and reference for the construction and effective implementation of other professional courses.
- Published
- 2024
- Full Text
- View/download PDF
33. Sustainable water-energy-environment nexus
- Author
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Meng Ni and Rongrong Wan
- Subjects
Water Supply ,Health, Toxicology and Mutagenesis ,Environmental Chemistry ,Environmental science ,Water ,General Medicine ,Renewable Energy ,Water energy ,Pollution ,Environmental planning ,Nexus (standard) ,Food Supply - Published
- 2021
34. Investigation of inner‐basin variation: Impact of large reservoirs on water regimes of downstream water bodies
- Author
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Zhongbo Yu, Xue Dai, Chong-Yu Xu, Guishan Yang, and Rongrong Wan
- Subjects
Hydrology ,Variation (linguistics) ,Downstream (manufacturing) ,Environmental science ,Structural basin ,Water Science and Technology - Abstract
Large dams and reservoirs alter not only the natural flow regimes of streams and rivers but also their flooding cycles and flood magnitudes. Although the effect of dams and reservoirs has been reported for some vulnerable locations, the understanding of the inner-basin variation with respect to the effects remains limited. In this study, we analyse the Three Gorges Dam (TGD) built on the Changjiang mainstream (Yangtze River) to investigate the dam effect variations in the system of interconnected water bodies located downstream. We investigated the effect of flow alterations along the downstream river network using discharge time series at different gauging stations. The river–lake interactions (referring to the interactions between the Changjiang mainstream and its tributary lakes i.e. the Dongting and Poyang lakes) and their roles in modifying the TGD effect intensity were also investigated in the large-scale river–lake system. The results show that the water storage of the tributary lakes decreased after the activation of the TGD. Severe droughts occurred in the lakes, weakening their ability to recharge the Changjiang mainstream. As a consequence, the effect of the TGD on the Changjiang flow increase during the dry season diminished quickly downstream of the dam, whereas its impact on the flow decrease during the wet season gradually exacerbated along the mainstream, especially at sites located downstream of the lake outlets. Therefore, when assessing dam-induced hydrological changes, special attention should be paid to the changes in the storage of tributary lakes and the associated effects in the mainstream. This is of high importance for managing the water resource trade-offs between different water bodies in dam-affected riverine systems.
- Published
- 2021
35. Water safety assessment and spatio-temporal changes in Dongting Lake, China on the basis of water regime during 1980–2014
- Author
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Peng Wang, Xue Dai, Zheng He, and Rongrong Wan
- Subjects
Atmospheric Science ,Global and Planetary Change ,010504 meteorology & atmospheric sciences ,0208 environmental biotechnology ,02 engineering and technology ,Management, Monitoring, Policy and Law ,Water safety ,01 natural sciences ,020801 environmental engineering ,Environmental science ,China ,Water resource management ,0105 earth and related environmental sciences ,Water Science and Technology - Abstract
The drastic changes in water regime are of great importance for maintaining water security in lakes with violent seasonal fluctuations. Based on hydrological data of Dongting Lake, the second largest freshwater lake in China, during 1980–2014, a set of water safety assessment methods suitable for seasonal lakes was constructed. Results demonstrated the following. (1) The year 2003 was a major time point for changes in water regime in Dongting Lake between 1980 and 2014. (2) The water regime changes in different parts of Dongting Lake exhibited certain similarities in periodicity and overall change trends. Among them, South Dongting Lake presented the best water security status, followed by East Dongting Lake and West Dongting Lake. (3) Compared with 1980–2002, the complexity of the water safety level change in East Dongting Lake increased in 2003–2014, as manifested in the tendency of the distribution of water safety levels to change sharply. (4) The influence of dry years on the water safety of Dongting Lake was greater than that of rainy years. The multi-time, multi-scale and multi-target lake water safety assessment method based on water regimes provides new ideas and methods for global research on seasonal lake water safety.
- Published
- 2019
36. Impact of seasonal water-level fluctuations on autumn vegetation in Poyang Lake wetland, China
- Author
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Rongrong Wan, Ligang Xu, Xiaolong Wang, Yanyan Li, Guishan Yang, Bing Li, and Xue Dai
- Subjects
Hydrology ,geography ,Resource (biology) ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Biodiversity ,Wetland ,Vegetation ,010502 geochemistry & geophysics ,01 natural sciences ,Water level ,Productivity (ecology) ,Spring (hydrology) ,General Earth and Planetary Sciences ,Environmental science ,China ,0105 earth and related environmental sciences - Abstract
Water level fluctuations (WLF) are natural patterns that are necessary for the survival of various plants, and WLF guarantee both the productivity and the biodiversity of wetlands. However, the underlying mechanisms of how changes in vegetation are linked to seasonal WLF remain unclear. Using vegetation and hydrological data from 1989 to 2009, we identified the key seasonal fluctuations and their impacts on vegetation in the Poyang Lake wetland by utilizing a tree-based hierarchical model. According to our results: 1) WLF in summer had significant impacts on both sedges and reeds. The severe summer floods promoted the expansion of sedges, while they inhibited the expansion of reeds; 2) WLF in autumn also greatly impacted sedges, while reeds were severely affected in spring. Specifically, we found that low water levels in autumn led to the expansion of sedges, and low water levels in spring led to the expansion of reeds. The results were well corroborated through comparisons of the vegetation distribution patterns over the last two decades (i.e., the 1990s and 2000s), which may shed light on corresponding water resource and wetland management.
- Published
- 2019
37. Review of the development of lake wetlands eco-hydrology and case studies
- Author
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Rongrong Wan, Xianghu Li, Xijun Lai, Xiaolong Wang, Limnology, Cas, Nanjing , China, and Ligang Xu
- Subjects
Hydrology ,geography ,geography.geographical_feature_category ,Hydrology (agriculture) ,Ecology ,Geography, Planning and Development ,Earth and Planetary Sciences (miscellaneous) ,Environmental science ,Wetland ,Nature and Landscape Conservation - Published
- 2019
38. Impacts of hydrological alteration on ecosystem services changes of a large river-connected lake (Poyang Lake), China
- Author
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Bing Li, Guishan Yang, Rongrong Wan, Xijun Lai, and Paul D. Wagner
- Subjects
China ,Lakes ,Environmental Engineering ,Rivers ,Animals ,General Medicine ,Hydrology ,Management, Monitoring, Policy and Law ,Waste Management and Disposal ,Ecosystem ,Environmental Monitoring - Abstract
Large lakes provide various types of ecosystem services (ESs), of which stocks and variations induced by hydrological alterations are largely unquantified. The present study investigates the long-term changes of five key ESs (i.e., flood regulation, water supply, fish production, nutrient retention and biodiversity conservation) in a large river connected lake (Poyang Lake), with special attention to impacts of hydrological alteration induced by the Three Gorges Dam (TGD). Hydrological data series, hydrodynamic model, the nutrient balance, fishery statistics, and wetland winter waterbird survey data from 1980 to 2016 were employed. Results showed that Poyang Lake provide significant ESs, with long-term average flood regulation, water supply and nutrient retention services of 167.7 × 10
- Published
- 2022
39. Hydrodynamic and water quality modeling of a large floodplain lake (Poyang Lake) in China
- Author
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Hengpeng Li, Bing Li, Rongrong Wan, and Guishan Yang
- Subjects
Pollution ,China ,010504 meteorology & atmospheric sciences ,Floodplain ,Discharge data ,Nitrogen ,Health, Toxicology and Mutagenesis ,media_common.quotation_subject ,Sewage ,010501 environmental sciences ,01 natural sciences ,Rivers ,Water Quality ,Environmental Chemistry ,Ecotoxicology ,0105 earth and related environmental sciences ,media_common ,Pollutant ,Hydrology ,geography ,geography.geographical_feature_category ,business.industry ,Phosphorus ,General Medicine ,Water level ,Lakes ,Models, Chemical ,Hydrodynamics ,Environmental science ,Water quality ,business ,Environmental Monitoring - Abstract
Floodplain lakes are valuable to humans because of their various functions and are characterized by dramatic hydrological condition variations. In this study, a two-dimensional coupled hydrodynamic and water quality model was applied in a large floodplain lake (i.e., Poyang Lake), to investigate spatial and temporal water quality variations. The model was established based on detailed data such as lake terrain, hydrological, and water quality. Observed lake water level and discharge and water quality parameters (TN, TP, CODMn, and NH4-N) were used to assess model performance. The hydrodynamic model results showed satisfactory results with R2 and MRE values ranging between 0.96 and 0.99 and between 2.45 and 6.14%, respectively, for lake water level simulations. The water quality model basically captured the temporal variations in water quality parameters with R2 of TN, TP, CODMn, and NH4-N simulation ranges of 0.56–0.91, 0.44–0.66, 0.64–0.67, and 0.44–0.57, respectively, with TP of Xingzi Station and CODMn of Duchang Station excluded, which may be further optimized with supplementation of sewage and industrial discharge data. The modeled average TN, TP, CODMn, and NH4-N concentrations across the lake were 1.36, 0.05, 1.99, and 0.48 mg/L, respectively. The modeled spatial variations of the lake showed that the main channel of the lake acted as a main pollutant passageway, and the east part of the lake suffered high level of pollution. In addition, consistent with previous water quality evaluations based on field investigations, water quality was the highest (average TN = 1.35 mg/L) during high water level periods and the poorest (average TN = 1.96 mg/L) during low water level periods. Scenario analysis showed that by decreasing discharge of upstream flow by 20% could result in the increase of TN and TP concentrations by 25.6% and 23.2% respectively. In summary, the model successfully reproduced the complex water and pollutant exchange processes in the systems involving upstream rivers, the Poyang Lake, and the Yangtze River. The model is beneficial for future modeling of the impact of different load reduction and other hydrological regime changes on water quality variation and provides a relevant example for floodplain lake management.
- Published
- 2018
40. Aquatic Ecosystem Health Assessment of Poyang Lake through Extension Evaluation Method
- Author
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Hongyun Zhu, Guishan Yang, Yanhui Zhang, Bing Li, and Rongrong Wan
- Subjects
lcsh:Hydraulic engineering ,010504 meteorology & atmospheric sciences ,Geography, Planning and Development ,aquatic ecosystem health assessment ,Biodiversity ,010501 environmental sciences ,Aquatic Science ,01 natural sciences ,Biochemistry ,Poyang Lake ,lcsh:Water supply for domestic and industrial purposes ,lcsh:TC1-978 ,Evaluation methods ,Environmental degradation ,0105 earth and related environmental sciences ,Water Science and Technology ,Trophic level ,Highly skilled ,extension evaluation method ,lcsh:TD201-500 ,Ecology ,Aquatic ecosystem ,thresholds ,indicators ,Water resources ,Health assessment ,Environmental science - Abstract
Freshwater lakes encounter a series of problems, such as a decline in lake water quality, a sharp decrease in biodiversity, and ecological degradation. As such, lacustrine studies by highly skilled professionals and managers with water resources at home and abroad have focused on assessing the aquatic ecosystem health status of lakes. In this study, the health status of the aquatic ecosystem in the largest freshwater lake in China (Poyang Lake) was assessed, and its temporal and spatial characteristics were illustrated. The index contained three element layers, including hydrologic characteristics, trophic status, and aquatic organisms. The health status of the aquatic ecosystem was classified into three categories: &lsquo, good&rsquo, &lsquo, moderate&rsquo, (subhealthy), and &lsquo, bad&rsquo, It was examined through extension evaluation method. Results showed &lsquo, health status, whereas remarkable seasonal and spatially variations. The annual changes in the health status were remarkably due to the influence of complex hydrological and hydrodynamic conditions. This study provides an overall understanding of the aquatic ecosystem evaluation in Poyang Lake. Such an understanding is vital for environmental conservation and identification of causes of the aquatic ecosystem degradation in Poyang Lake.
- Published
- 2021
41. From the Public Health Perspective: a Scalable Model for Improving Epidemiological Testing Efficacy in Low- and Middle-Income Areas
- Author
-
Xuefeng Huang, Qian-Yi Kong, Xiaowen Wan, Yating Huang, Rongrong Wang, Xiaoxue Wang, Yingying Li, Yuqing Wu, Chongyuan Guan, Junyang Wang, and Yuanyuan Zhang
- Subjects
Public aspects of medicine ,RA1-1270 - Abstract
The globe is an organically linked whole, and in the pandemic era, COVID-19 has brought heavy public safety threats and economic costs to humanity as almost all countries began to pay more attention to taking steps to minimize the risk of harm to society from sudden-onset diseases. It is worth noting that in some low- and middle-income areas, where the environment for epidemic detection is complex, the causative and comorbid factors are numerous, and where public health resources are scarce. It is often more difficult than in other areas to obtain timely and effective detection and control in the event of widespread virus transmission, which, in turn, is a constant threat to local and global public health security. Pandemics are preventable through effective disease surveillance systems, with nonpharmacological interventions (NPIs) as the mainstay of the control system, effectively controlling the spread of epidemics and preventing larger outbreaks. However, current state-of-the-art NPIs are not applicable in low- and middle-income areas and tend to be decentralized and costly. Based on a 3-year case study of SARS-CoV-2 preventive detection in low-income areas in south-central China, we explored a strategic model for enhancing disease detection efficacy in low- and middle-income areas. For the first time, we propose an integrated and comprehensive approach that covers structural, social, and personal strategies to optimize the epidemic surveillance system in low- and middle-income areas. This model can improve the local epidemic detection efficiency, ensure the health care needs of more people, reduce the public health costs in low- and middle-income areas in a coordinated manner, and ensure and strengthen local public health security sustainably.
- Published
- 2024
- Full Text
- View/download PDF
42. Combined subsoiling and ridge–furrow rainfall harvesting during the summer fallow season improves wheat yield, water and nutrient use efficiency, and quality and reduces soil nitrate-N residue in the dryland summer fallow–winter wheat rotation
- Author
-
Jinzhi Wu, Rongrong Wang, Wenxin Zhao, Kainan Zhao, Shanwei Wu, Jun Zhang, Hezheng Wang, Guozhan Fu, Ming Huang, and Youjun Li
- Subjects
dryland ,wheat ,tillage practice during summer fallow season ,grain yield ,productivity ,nitrate-N residue ,Plant culture ,SB1-1110 - Abstract
Both subsoiling tillage (ST) and ridge and furrow rainfall harvesting (RF) are widely implemented and play an important role in boosting wheat productivity. However, information about the effects of ST coupled with RF during the summer fallow season on wheat productivity and environmental issues remains limited. This study aims to explore the effects of ST coupled with RF on water harvesting, wheat productivity–yield traits, water and nutrient use efficiency and quality, and soil nitrate-N residue in dryland winter wheat–summer fallow rotation at the intersection of southern Loess Plateau and western Huang–Huai–Hai Plain in China in 2018–2022. Three tillage practices—deep plowing with straw turnover (PTST), subsoiling with straw mulching (STSM), and STSM coupled with RF (SRFSM)—are conducted during the summer fallow season. The results indicated that tillage practices during the summer fallow season significantly impacted wheat productivity and soil nitrate-N residue. Compared to PTST, STSM significantly enhanced rainfall fallow efficiency and water use efficiency by 7.0% and 14.2%, respectively, as well as N, P, and K uptake efficiency by 16.9%, 16.2%, and 15.3%, and thus increased grain yield by 14.3% and improved most parameters of protein components and processing quality, albeit with an increase in nitrate-N residue in the 0- to 300-cm soil depth by 12.5%. SRFSM, in turn, led to a further increase in water storage at sowing, resulting in an increase of water use efficiency by 6.8%, as well as N, P, and K uptake efficiency and K internal efficiency by 11.8%, 10.4%, 8.8%, and 4.7%, thereby significantly promoting grain yield by 10.2%, and improving the contents of all the protein components and enhancing the processing quality in grain, and simultaneously reducing the nitrate-N residue in the 0- to 300-cm soil layer by 16.1%, compared to STSM. In essence, this study posits that employing subsoiling coupled with ridge–furrow rainfall harvesting (SRFSM) during the summer fallow season is a promising strategy for enhancing wheat yield, efficiency, and quality, and simultaneously reducing soil nitrate-N residue within the dryland summer fallow–winter wheat rotation system.
- Published
- 2024
- Full Text
- View/download PDF
43. Compound heterozygous ABCA12 variants identified in a Chinese patient with congenital ichthyosiform erythroderma: Advancing genotype–phenotype correlations and literature review
- Author
-
Jia‐Wei Liu, Kexin Guo, Rui Zhang, Rongrong Wang, Dong‐Lai Ma, and Xue Zhang
- Subjects
ABCA12 ,autosomal recessive congenital ichthyosis (ARCI) ,compound heterozygous variants ,congenital ichthyosiform erythroderma (CIE) ,genotype–phenotype correlations ,Genetics ,QH426-470 - Abstract
Abstract Background Ichthyosis is a common keratotic skin disease with high clinical, etiological and genetic heterogeneity. There are four types of non‐syndromic hereditary ichthyoses, among which autosomal recessive congenital ichthyosis (ARCI) is a heterogeneous group of recessive Mendelian disorders. ARCI present with different phenotypes and ABCA12 pathogenic variants have been shown to cause complex ARCI phenotypes, including harlequin ichthyosis (HI), lamellar ichthyosis (LI) and congenital ichthyosiform erythroderma (CIE). Methods A sporadic male patient, clinically diagnosed with CIE, was enrolled in this study. Exome sequencing was combined with Sanger sequencing to confirm the diagnosis and identify the pathogenic variants. In silico predictions were made using multiple software programs, and the identified variants were interpreted using the ACMG guidelines. A review of all literature reported ABCA12 variants was performed to explore genotype–phenotype correlations. Results Compound heterozygous ABCA12 variants [c.5381+1G>A and c.5485G>C (p.Asp1829His)] (NM_173076) were identified. The two variants were not detected in the public database. c.5381+1G>A is predicted to affect ABCA12 mRNA splicing and Asp1829 is highly conserved among various species. In silico analysis suggested that these two variants were responsible for the phenotype of the patient. Genotype–phenotype correlation analysis showed that biallelic truncation variants and/or exon/amino acid deletions in ABCA12 are the most common causes of HI. Biallelic missense variants are most common in LI and CIE. Conclusions The compound heterozygous ABCA12 variants caused the CIE phenotype observed in the patient. The spectrum of ABCA12 pathogenic variants were broaden. Genotype–phenotype correlation analysis provided detailed evidence which can be used in future prenatal diagnosis and can inform the need for genetic counselling for patients with ABCA12‐related ARCIs.
- Published
- 2024
- Full Text
- View/download PDF
44. Congenital disorders of glycosylation with multiorgan disruption and immune dysregulation caused by compound heterozygous variants in MAN2B2
- Author
-
Shiqi Fan, Huanhuan Wu, Rongrong Wang, Qian Chen, and Xue Zhang
- Subjects
congenital disorders of glycosylation ,inborn error of metabolism ,MAN2B2 ,N‐glycan ,Genetics ,QH426-470 - Abstract
Abstract Background Congenital disorders of glycosylation (CDG) are a type of inborn error of metabolism (IEM) resulting from defects in glycan synthesis or failed attachment of glycans to proteins or lipids. One rare type of CDG is caused by homozygous or compound heterozygous loss‐of‐function variants in mannosidase alpha class 2B member 2 (MAN2B2). To date, only two cases of MAN2B2‐CDG have been reported worldwide. Methods Trio whole‐exome sequencing (Trio‐WES) was conducted to screen for candidate variants. N‐glycan profiles were measured by liquid chromatography–tandem mass spectrometry (LC–MS/MS). MAN2B2 expression was evaluated by western blotting. MX dynamin like GTPase 1 (MX1) function was estimated via Thogoto virus (THOV) minireplicon assay. Results Trio‐WES identified compound heterozygous MAN2B2 (hg19, NM_015274.1) variants (c.384G>T; c.926T>A) in a CDG patient. This patient exhibited metabolic abnormalities, symptoms of digestive tract dysfunction, infection, dehydration, and seizures. Novel immune dysregulation characterized by abnormal lymphocytes and immunoglobulin was observed. The MAN2B2 protein level was not affected, while LC–MS/MS showed obvious disruption of N‐glycans and N‐linked glycoproteins. Conclusion We described a CDG patient with novel phenotypes and disruptive N‐glycan profiling caused by compound heterozygous MAN2B2 variants (c.384G>T; c.926T>A). Our findings broadened both the genetic and clinical spectra of CDG.
- Published
- 2024
- Full Text
- View/download PDF
45. Organic fertilizer substituting 20% chemical N increases wheat productivity and soil fertility but reduces soil nitrate-N residue in drought-prone regions
- Author
-
Jun Zhang, Shuang Li, Peipei Jiang, Rongrong Wang, Jinhua Guo, Huishu Xiao, Jinzhi Wu, Muhammad Shaaban, Youjun Li, and Ming Huang
- Subjects
dryland ,organic fertilizer substitution ,grain yield ,grain protein ,N use efficiency ,soil fertility ,Plant culture ,SB1-1110 - Abstract
Organic fertilizer substitution is an effective measure for increasing both the quantity and quality of wheat grain while reducing chemical fertilizer input. However, the effects of reducing nitrogen (N) fertilizer combined with organic fertilizer substitution on grain yield, grain protein content and protein yield, plant N accumulation and translocation, N use efficiency, soil fertility, N apparent surplus and nitrate-N residue in rain-fed drought-prone areas remains limited. In this study, field experiments were conducted over four consecutive seasons (2019-2023) at two sites with four treatments: zero N application (ZN), farmer N application (FN), reduced 20% N of FN (RN), and organic fertilizer substituting 20% N of RN (OSN). The results showed that compared with the ZN treatment, the FN, RN and OSN treatments increased grain yield and its components, grain protein content and protein yield, aboveground N accumulation at the anthesis and maturity stages, pre-anthesis N translocation, post-anthesis N accumulation, N use efficiency, soil fertility. Compared with RN and FN, OSN increased grain yield by 17.12% and 15.03%, grain protein yield by 3.31% and 17.15%, grain N accumulation by 17.78% and 15.58%, and N harvest index by 2.63% and 4.45% averaged across years and sites, respectively. Moreover, OSN increased the contents of organic matter, total N, available P and available K in both 0-20 and 20-40 cm soil layers, decreased N apparent surplus and nitrate-N residue in 0-100 cm, and pH in both 0-20 and 20-40 cm soil layer. Fundamentally, this study suggests that integrating a 20% reduction N from conventional farmer practices with the utilization of organic fertilizer to replace 20% of the chemical N fertilizer (OSN) represents an effective strategy. This approach shows promise in enhancing wheat grain yield, grain protein yield, and N use efficiency. Additionally, it supports the improvement of soil fertility while simultaneously reducing soil nitrate-N residues and the apparent surplus of N in rain-fed drought-prone regions.
- Published
- 2024
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46. Traditional Chinese medicine for idiopathic membranous nephropathy: A systematic review and meta-analysis
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Wenjun Shan, Haiyu Guan, Haowen Gu, Rongrong Wang, Xiaoyan Huang, Ping Li, Ying Xie, Kun Bao, and Xindong Qin
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Idiopathic membranous nephropathy ,Traditional Chinese medicine ,Systematic review ,Meta-analysis ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Background: Idiopathic membranous nephropathy (IMN) is a rare autoimmune disorder that causes nephrotic syndromes in adults. Conventional immunosuppressive therapies often exhibit limited efficacy in achieving remission and may result in notable adverse reactions, warranting the exploration of novel therapeutic approaches for IMN treatment. Traditional Chinese medicine (TCM), which is extensively used for kidney disease management, is a promising alternative. Objective: This study aimed to examine the safety and efficacy of TCM alone or in combination with Western medicine for the management of patients diagnosed with IMN. Methods: This study employed a systematic search of English and Chinese electronic databases to identify randomized controlled trials (RCTs) that examined the application of TCM in the treatment of IMN. RCTs that met the predetermined inclusion and exclusion criteria and assessed the safety and efficacy of TCM alone or in combination with Western medicine in patients with IMN were included in the analysis. The methodological quality of the included studies was evaluated by using a risk-of-bias tool. All statistical analyses were performed using the RevMan software (version 5.4.2). The evidence was evaluated on the https://www.gradepro.org/website. Results: This study included 29 randomized controlled trials (RCTs) involving 1982 patients with moderate methodological quality that met the inclusion criteria. The results showed that, compared to Western medicine alone therapy, the use of TCM alone or in combination with Western medicine significantly improved total remission (TR) rate (risk ratios [RR] 1.38, 95% confidence interval [CI] 1.29–1.46, I2 = 0%, P
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- 2024
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47. The mental health burden of food allergies: Insights from patients and their caregivers from the Food Allergy Research & Education (FARE) Patient Registry
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Thomas B. Casale, M.D., Christopher Warren, Ph.D, Sachin Gupta, M.D., Robert Schuldt, Ph.D, Rongrong Wang, MPH, Ahmar Iqbal, M.D., Arpamas Seetasith, Ph.D, and Ruchi Gupta, M.D, MPH
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Food hypersensitivity ,Mental health ,Anxiety ,Caregivers ,Food allergy ,Anaphylaxis ,Immunologic diseases. Allergy ,RC581-607 - Abstract
Background: Food allergies impose a large psychosocial burden, including mental, emotional, and social aspects, on both patients and their caregivers. Patients, caregivers, and their families often experience anxiety, isolation, and fear around food allergies. Objective: To assess the real-world mental health burden of food allergies, using the Food Allergy Research & Education (FARE) Patient Registry (NCT04653324). Methods: Self-reported data from patients with food allergies, and their caregivers, were analyzed from the FARE Food Allergy History and Mental Health Concerns surveys. Odds ratios were also calculated as a measure of association between patient food allergy characteristics and the likelihood of having mental health concerns or a formal mental health diagnosis. Results: The FARE Patient Registry included 1680 patients/caregivers. Anxiety (54%) and panic (32%) were the most common emotions that patients reported as a result of eating the food that produced an allergic reaction. About two-thirds of patients reported mental health concerns related to food allergies (62%), including anxiety after an allergic reaction, anxiety about living with food allergies, and concerns about food avoidance. Caregivers also experienced fear for the safety of their children, and often sought mental health care to cope with worry related to caring for patients with food allergies. The likelihood of having food allergy-related mental health concerns was increased for patients experiencing more than 1 reaction per year (OR 1.68–1.90) and was lowered for patients having a formal mental health diagnosis (OR 0.43). Caregivers filling out the FARE survey for pediatric patients (OR 4.03) and experiencing food allergy-related mental health concerns (OR 2.36) were both significant predictors for having a formal mental health diagnosis. Conclusion: Our study highlights a continuing unmet need for mental health screening and support as part of the management of patients with food allergies.
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- 2024
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48. Identification of hub genes and their correlation with immune infiltrating cells in membranous nephropathy: an integrated bioinformatics analysis
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Miaoru Han, Yi Wang, Xiaoyan Huang, Ping Li, Xing Liang, Rongrong Wang, and Kun Bao
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Biomarker ,Immune cell infiltration ,Least absolute shrinkage and selection operator algorithm ,Membranous nephropathy ,Weighted gene co-expression network analysis ,Medicine - Abstract
Abstract Background Membranous nephropathy (MN) is a chronic glomerular disease that leads to nephrotic syndrome in adults. The aim of this study was to identify novel biomarkers and immune-related mechanisms in the progression of MN through an integrated bioinformatics approach. Methods The microarray data were downloaded from the Gene Expression Omnibus (GEO) database. The differentially expressed genes (DEGs) between MN and normal samples were identified and analyzed by the Gene Ontology analysis, the Kyoto Encyclopedia of Genes and Genomes analysis and the Gene Set Enrichment Analysis (GSEA) enrichment. Hub The hub genes were screened and identified by the weighted gene co-expression network analysis (WGCNA) and the least absolute shrinkage and selection operator (LASSO) algorithm. The receiver operating characteristic (ROC) curves evaluated the diagnostic value of hub genes. The single-sample GSEA analyzed the infiltration degree of several immune cells and their correlation with the hub genes. Results We identified a total of 574 DEGs. The enrichment analysis showed that metabolic and immune-related functions and pathways were significantly enriched. Four co-expression modules were obtained using WGCNA. The candidate signature genes were intersected with DEGs and then subjected to the LASSO analysis, obtaining a total of 6 hub genes. The ROC curves indicated that the hub genes were associated with a high diagnostic value. The CD4+ T cells, CD8+ T cells and B cells significantly infiltrated in MN samples and correlated with the hub genes. Conclusions We identified six hub genes (ZYX, CD151, N4BP2L2-IT2, TAPBP, FRAS1 and SCARNA9) as novel biomarkers for MN, providing potential targets for the diagnosis and treatment.
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- 2023
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49. Analysis of resistance genes of carbapenem-resistant Providencia rettgeri using whole genome sequencing
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Mi Liu, Na Yi, Xinyi Wang, and Rongrong Wang
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Whole genome sequencing ,Carbapenem-resistant Providencia rettgeri ,Microbiology ,QR1-502 - Abstract
Abstract Objective This study aimed to investigate the clinical infection characteristics and analyze the resistance gene carrying status of carbapenem-resistant Providencia rettgeri via whole genome sequencing (WGS). Methods Carbapenem-resistant P. rettgeri were collected from clinical patients between January 2020 and December 2021, and their susceptibility to 19 antimicrobial drugs was determined using the VITEK 2 Compact system and Kirby–Bauer (KB) disk diffusion method. The Illumina platform was used to perform WGS of the P. rettgeri isolates, and the resistance genes carried by the Carbapenem-resistant P. rettgeri strains were detected via ABRicate software. The phylogenetic tree was constructed by thirty-four strains including twenty-eight strains downloaded from NCBI database and the carbapenem-resistant six P. rettgeri strains in this study. Which based on genomic single nucleotide polymorphism (SNP) to understand the affinities of the carbapenem-resistant P. rettgeri strains. Results Six carbapenem-resistant P. rettgeri strains were isolated from five different clinical departments using the blood, urine, sputum, and secretion specimens. These infected patients are middle-aged and elderly people with a history of severe trauma, tumors, hypertension, and various other underlying diseases, and invasive procedures. Antimicrobial sensitivity testing showed that all strains presented resistance to ampicillin-sulbactam, ceftazidime, ciprofloxacin, levofloxacin, and ertapenem, whereas they exhibited full susceptibility to cefepime and amikacin. Most strains demonstrated high resistance to β-lactams, aminoglycosides, and sulfonamides. Thirty-five resistance genes were identified by ABRicate. All carbapenem-resistant P. rettgeri strains carried aminoglycoside, fluoroquinolone, chloramphenicol, rifampicin, sulfonamide, and β-lactam resistance genes, and most importantly, all strains possessed the carbapenem resistance gene bla NDM−1. The six P. rettgeri strains in this study and the 28 carbapenem-resistant P. rettgeri strains from the NCBI database were divided into four evolutionary groups. The WF3643, WF3849, WF3822, and WF3821 strains in this study were in the same evolutionary group (clade A), while the closely related WF3099 and WF3279 strains were in different evolutionary groups (clade B and clade D), respectively. The WF3099 strain was distantly related to the other five strains. Conclusion Carbapenem-resistant P. rettgeri strains were mostly isolated from middle-aged and older patients with a history of surgery or serious underlying diseases, and they were found to cause multisystem infections. All Carbapenem-resistant P. rettgeri strains in this study carried bla NDM−1 and multiple antimicrobial drug resistance genes. Furthermore, the P. rettgeri strains in this study were closely related, suggesting the possibility of nosocomial infections. Therefore, our study highlights the need for research on P. rettgeri to control the spread of these nosocomial infections.
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- 2023
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50. Integrated Control of a Wheel–Track Hybrid Vehicle Based on Adaptive Model Predictive Control
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Boyuan Li, Zheng Pan, Junhua Liu, Shiyu Zhou, Shaoxun Liu, Shouyuan Chen, and Rongrong Wang
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tracked vehicle ,model predictive control ,wheel–track vehicle ,Mechanical engineering and machinery ,TJ1-1570 - Abstract
Hybrid wheel–track systems have found extensive applications due to the advantages a combination of wheels and tracks. However, the coupling influence between the wheeled and tracked mechanisms poses a challenge to stable and efficient controller design and implementation. This paper focuses on the lateral dynamic control of a vehicle in scenarios where both tracks and wheels are in contact with the ground. A dynamic model of a vehicle is first established based on the tire brush model and linearized general track model. Based on the dynamic model, a novel adaptive model predictive control (AMPC) method is designed considering the coupling and nonlinearity of the wheels and tracks to simultaneously regulate both mechanisms. Compared with traditional model predictive control approaches, the AMPC controller takes the side-slip angle and slip ratio as constraints to prevent the vehicle from reaching unstable states. Simulations are conducted to validate the effectiveness of the controller, and the results indicate that the controller has the capacity to optimize the objective’s yaw-rate response while maintaining lateral vehicle stability and preventing slip by imposing constraints.
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- 2024
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