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River restoration challenges with a specific view on hydromorphology

Jianhua LI, Stephan HOERBINGER, Clemens WEISSTEINER, Lingmin PENG, Hans Peter RAUCH

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 5,   Pages 1033-1038 doi: 10.1007/s11709-020-0665-9

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Trajectory planning and base attitude restoration of dual-arm free-floating space robot by enhanced bidirectional

Zongwu XIE1 , Xiaoyu ZHAO1 , Zainan JIANG1 , Haitao YANG2 , Chongyang LI1

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 1, doi: 10.1007/s11465-021-0658-y

Abstract: When free-floating space robots perform space tasks, the satellite base attitude is disturbed by the dynamic coupling. The disturbance of the base orientation may affect the communication between the space robot and the control center on earth. In this paper, the enhanced bidirectional approach is proposed to plan the manipulator trajectory and eliminate the final base attitude variation. A novel acceleration level state equation for the nonholonomic problem is proposed, and a new intermediate variable-based Lyapunov function is derived and solved for smooth joint trajectory and restorable base trajectories. In the method, the state equation is first proposed for dual-arm robots with and without end constraints, and the system stability is analyzed to obtain the system input. The input modification further increases the system stability and simplifies the calculation complexity. Simulations are carried out in the end, and the proposed method is validated in minimizing final base attitude change and trajectory smoothness. Moreover, the minute internal force during the coordinated operation and the considerable computing efficiency increases the feasibility of the method during space tasks.

Keywords： free-floating space robot     dual arm     coordinated operation     base attitude restoration     bidirectional    

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Restoration of hyper-eutrophic water with a modularized and air adjustable constructed submerged plant

Jinzhong LI, Xueju LI, Shujuan SUN, Xuegong LIU, Suiliang HUANG

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 4,   Pages 573-584 doi: 10.1007/s11783-011-0363-x

Abstract: A modularized and air adjustable constructed submerged plant bed (CSPB) which can be used to restore the eutrophic water is introduced in this paper. This plant bed helps hydrophyte grow under poor conditions such as frequently changed water depth, impaired water transparency, algae bloom and substantial duckweed in summer, which are not naturally suitable for growing hydrophyte. This pilot study in Waihuan River of Tianjin, China, revealed that reduction of Chemical Oxygen Demand (COD), Total Nitrogen (TN) and Total Phosphorus (TP) by the use of CSPB could be reached 30%–35%, 35%–40%, 30%–40% respectively in the growing season (from March to October) and 5%–10%, 5%–15%, 7%–20% respectively in the winter (from November to February) when the detention time was 6 d. The relationships between the concentration of COD, TN, TP and the detention time fit the first-order kinetic equation well and the coefficients of determination ( ) were all above 0.9. The attenuation coefficients k of the kinetic equation were a function of the water temperature. When the water temperature was quite low or quite high, was not significantly changed with increasing or decreasing water temperature. While when the temperature was in a moderate range, an increase or decrease of water temperature would lead to a rapid increase or decrease in .

Keywords： modularized and air adjustable constructed submerged plant bed     water purification     eco-restoration techniques    

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Strategies for Water Security and Aquatic Ecosystem Restoration in the Yangtze River Economic Belt

Hu Chunhong, Zhang Shuanghu

Strategic Study of CAE 2022, Volume 24, Issue 1,   Pages 166-175 doi: 10.15302/J-SSCAE-2022.01.018

Abstract:

Working together on protection instead of excessive development is the key strategy for promoting the high-quality development of the Yangtze River Economic Belt. It is necessary to tackle principal contradictions with targeted measures in the process of Yangtze River protection. In this paper, we analyze the major issues regarding water security and aquatic ecosystem protection in the Yangtze River Economic Belt, including the severe flood control safety situation, the serious shrinkage of suitable habitats for aquatic animals and biodiversity reduction, and the dysfunctional relationship between the Yangtze River and its connected lakes. Additional, we propose several targeted measures and strategies. The measures for improving the flood control capability are to accelerate the construction of safety projects in critical flood storage and detention areas and revise the Yangtze River Basin Flood Control Planning. The strategies for restoring the damaged aquatic ecosystem are to construct substitute habitats in the tributaries in the upper reaches of the Yangtze River, restore the connection between the Yangtze River and some former connected lakes in the middle and lower reaches, and expand the ecological operation of reservoirs. The strategies for regulating the river–lake relationship are to improve the four water systems in the north of the Dongting Lake and build floodgates at the outlet of the Poyang Lake.

Keywords： Yangtze River Economic Belt     water security     aquatic ecosystem restoration     flood control safety     habitat    

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Eutrophication status and control strategy of Taihu Lake

ZHANG Limin, XIA Minfang, ZHANG Lei, WANG Chun, LU Jilai

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 3,   Pages 280-290 doi: 10.1007/s11783-008-0062-4

Abstract: summarized, including the control of internal pollution sources and inflow-river pollution, ecological restoration

Keywords： eutrophication     GDP     capacity     reconstruction     ecological restoration    

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Water Resource Effectiveness of Vegetation Conservation and Restoration in North China

Sun Siqi,Chen Yongzhe,Wang Cong,Hu Qingfang,Lyu Yihe

Strategic Study of CAE 2022, Volume 24, Issue 5,   Pages 97-106 doi: 10.15302/J-SSCAE-2022.05.012

Abstract:

In recent years, a series of ecological protection and restoration projectsExploring the impact of regional vegetation restoration on the water circulation process and the balanceof water supply and demand is important for improving ecological restoration strategies and realizingare identified, and the tradeoff between water resources and vegetation restoration is discussed.The results show that the effects of ecological protection and restoration projects are remarkable, with

Keywords： North China     ecological restoration projects     evapotranspiration     water storage     net primary productivity     atural restoration    

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Application of endoscopic techniques in orbital blowout fractures

Shu Zhang, Yinwei Li, Xianqun Fan

Frontiers of Medicine 2013, Volume 7, Issue 3,   Pages 328-332 doi: 10.1007/s11684-013-0271-5

Abstract:

Minimally invasive surgical techniques, particularly endoscopic techniques, have revolutionized otolaryngeal surgery. Endoscopic techniques have been gradually applied in orbital surgery through the sinus inferomedial to the orbit and the orbital subperiosteal space. Endoscopic techniques help surgeons observe fractures and soft tissue of the posterior orbit to precisely place implants and protect vital structures through accurate, safe, and minimally invasive approaches. We reviewed the development of endoscopic techniques, the composition of endoscopic systems for orbital surgery, and the problems and developmental prospects of endoscopic techniques for simple orbital wall fracture repair.

Keywords： orbital fractures     endoscope     restoration     surgery    

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Advances of ecological restoration of lakeside zone

Chai Peihong,Dai Yanran,Liang Wei,Cheng Shuiping,Wu Zhenbin

Strategic Study of CAE 2010, Volume 12, Issue 6,   Pages 32-35

Abstract: text-align: justify;">In this paper, the definition and function, together with the different stages of restoration

Keywords： lakeside zone     ecological restoration     research advances     prospect    

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A CASE FOR ASSESSING ALLOCASUARINA AND CASUARINA SPP. FOR USE IN AGROECOSYSTEM IMPROVEMENT IN SEMI-ARID AREAS WITH A FOCUS ON CENTRAL ANATOLIA, TURKEY

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 4,   Pages 568-582 doi: 10.15302/J-FASE -2019270

Abstract:

Agroecosystems in water-limited contexts— Mediterranean, semi-arid and arid climatic zones—are too frequently degraded systems that will not provide the needed ecosystem services to ensure a future of sustainable agricultural production. The processes that have created this situation continue and are being accelerated by anthropogenic climate change. Increasing arboreal vegetation in these areas through agroforestry is an important strategy to conserve and improve their agroecosystems. Actinorhizal trees and shrubs in the Casurinaceae have a unique set of adaptations for heat and water stress, and/or infertile to hostile soils. Central Anatolia, Turkey is particularly at risk of increasing aridity and further degradation. Therefore, species of Allocasuarina and Casuarina have been evaluated for their potential use in agroecosystem improvement in semi-arid areas with a focus on Central Anatolia. Based on a semiquantitative environmental tolerance index and reported plant stature, eight species were identified as being of high (A. verticillata and C. pauper) to moderate (A. acutivalvis, A. decaisneana, A. dielsiana, A. huegeliana, C. cristata and C. obesa) priority for assessment, with none of these species having been adequately evaluated for agroforestry deployment in semi-arid agroecosystems in any context.

 

Keywords： actinorrhizal trees / agroforestry / climate change / ecosystem restoration    

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Integrating Top-Down and Bottom-Up Approaches Improves Practicality and Efficiency of Large-Scale Ecological Restoration Article

Zhaowei Ding, Hua Zheng, Jun Wang, Patrick O´Connor, Cong Li, Xiaodong Chen, Ruonan Li, Zhiyun Ouyang

Engineering 2023, Volume 31, Issue 12,   Pages 50-58 doi: 10.1016/j.eng.2022.08.008

Abstract:

Ecological restoration policies and their implementation are influenced by ecological and socioeconomicHere, we established a new ecological restoration planning approach linking a social–ecologicalsystem framework to large-scale ecological restoration planning.In contrast, spatial matching between planned and actual restoration increased from 61.55% to 81.86%Our new approach incorporates socioeconomic factors into large-scale ecological restoration planning

Keywords： Social-ecological system     Ecological restoration     Top-down approach     Bottom-up approach    

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A case for assessing

Ian T. RILEY

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 4,   Pages 568-582 doi: 10.15302/J-FASE-2019270

Abstract: Agroecosystems in water-limited contexts— Mediterranean, semi-arid and arid climatic zones—are too frequently degraded systems that will not provide the needed ecosystem services to ensure a future of sustainable agricultural production. The processes that have created this situation continue and are being accelerated by anthropogenic climate change. Increasing arboreal vegetation in these areas through agroforestry is an important strategy to conserve and improve their agroecosystems. Actinorhizal trees and shrubs in the Casurinaceae have a unique set of adaptations for heat and water stress, and/or infertile to hostile soils. Central Anatolia, Turkey is particularly at risk of increasing aridity and further degradation. Therefore, species of and have been evaluated for their potential use in agroecosystem improvement in semi-arid areas with a focus on Central Anatolia. Based on a semiquantitative environmental tolerance index and reported plant stature, eight species were identified as being of high ( . and . ) to moderate ( . , . , . , . , . and . ) priority for assessment, with none of these species having been adequately evaluated for agroforestry deployment in semi-arid agroecosystems in any context.

Keywords： actinorrhizal trees     agroforestry     climate change     ecosystem restoration    

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A global synthesis of the effectiveness and ecological impacts of management interventions for species

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 11, doi: 10.1007/s11783-023-1741-x

Abstract:

● Spartina abundance decreases over time by chemical control.

Keywords： Plant invasion     Biodiversity     Meta-analysis     Restoration     Salt marshes     Treatment timing    

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Grassland ecology in China: perspectives and challenges

Deli WANG, Ling WANG, Jushan LIU, Hui ZHU, Zhiwei ZHONG

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 1,   Pages 24-43 doi: 10.15302/J-FASE-2018205

Abstract: 3) Global climate change and grassland processes and functioning. (4) Applied research on grassland restorationand ecosystem health assessments such as vegetation restoration, restoration of ecosystem functioning

Keywords： biodiversity     climate change     China     grazing     meadow     restoration     steppe    

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Start-up of PN-anammox system under low inoculation quantity and its restoration after low-loading rate

Guoliang Zhang, Liang Zhang, Xiaoyu Han, Shujun Zhang, Yongzhen Peng

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 2, doi: 10.1007/s11783-020-1324-z

Abstract: that promoted the synergetic growth of functional bacteria was achieved, leading to the successful restoration

Keywords： PN-anammox     Granular sludge     Excess nitrate build-up     Recovery strategy for partial nitrification     Aggressive discharge of sludge    

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Ecosystem health assessment of urban rivers and lakes

ZHANG Fengling, LIU Jingling, YANG Zhifeng, LI Yongli

Frontiers of Environmental Science & Engineering 2008, Volume 2, Issue 2,   Pages 209-217 doi: 10.1007/s11783-008-0007-y

Abstract: ecosystem health of urban rivers and lakes is the scientific basis for their management and ecological restorationSome suggestions on scientific management and ecological restoration of the six lakes were proposed:

Keywords： unhealthy     management     ecological restoration     Zhonghai     non-point pollution    

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Title Author Date Type Operation

River restoration challenges with a specific view on hydromorphology

Jianhua LI, Stephan HOERBINGER, Clemens WEISSTEINER, Lingmin PENG, Hans Peter RAUCH

Journal Article

Trajectory planning and base attitude restoration of dual-arm free-floating space robot by enhanced bidirectional

Zongwu XIE1 , Xiaoyu ZHAO1 , Zainan JIANG1 , Haitao YANG2 , Chongyang LI1

Journal Article

Restoration of hyper-eutrophic water with a modularized and air adjustable constructed submerged plant

Jinzhong LI, Xueju LI, Shujuan SUN, Xuegong LIU, Suiliang HUANG

Journal Article

Strategies for Water Security and Aquatic Ecosystem Restoration in the Yangtze River Economic Belt

Hu Chunhong, Zhang Shuanghu

Journal Article

Eutrophication status and control strategy of Taihu Lake

ZHANG Limin, XIA Minfang, ZHANG Lei, WANG Chun, LU Jilai

Journal Article

Water Resource Effectiveness of Vegetation Conservation and Restoration in North China

Sun Siqi,Chen Yongzhe,Wang Cong,Hu Qingfang,Lyu Yihe

Journal Article

Application of endoscopic techniques in orbital blowout fractures

Shu Zhang, Yinwei Li, Xianqun Fan

Journal Article

Advances of ecological restoration of lakeside zone

Chai Peihong,Dai Yanran,Liang Wei,Cheng Shuiping,Wu Zhenbin

Journal Article

A CASE FOR ASSESSING ALLOCASUARINA AND CASUARINA SPP. FOR USE IN AGROECOSYSTEM IMPROVEMENT IN SEMI-ARID AREAS WITH A FOCUS ON CENTRAL ANATOLIA, TURKEY

Journal Article

Integrating Top-Down and Bottom-Up Approaches Improves Practicality and Efficiency of Large-Scale Ecological Restoration

Zhaowei Ding, Hua Zheng, Jun Wang, Patrick O´Connor, Cong Li, Xiaodong Chen, Ruonan Li, Zhiyun Ouyang

Journal Article

A case for assessing

Ian T. RILEY

Journal Article

A global synthesis of the effectiveness and ecological impacts of management interventions for species

Journal Article

Grassland ecology in China: perspectives and challenges

Deli WANG, Ling WANG, Jushan LIU, Hui ZHU, Zhiwei ZHONG

Journal Article

Start-up of PN-anammox system under low inoculation quantity and its restoration after low-loading rate

Guoliang Zhang, Liang Zhang, Xiaoyu Han, Shujun Zhang, Yongzhen Peng

Journal Article

Ecosystem health assessment of urban rivers and lakes

ZHANG Fengling, LIU Jingling, YANG Zhifeng, LI Yongli

Journal Article