Article
Construction & Building Technology
Emily Z. Berglund, Michael Skarbek, Lufthansa Kanta
Summary: Population growth and climate change can lead to water deficits in urban water supply systems. This study develops an analytical approach to identify tipping points in water supply systems based on ecological resilience. A sociotechnical modeling framework is used to simulate the interactions between human behavior and water infrastructure under different stress gradients. The framework is applied to a case study to analyze tipping points under climate change scenarios and management strategies. This sociotechnical approach can help simulate, predict, and prevent tipping points in water supply systems.
SUSTAINABLE CITIES AND SOCIETY
(2023)
Article
Ecology
Guangjing Qian, Lai Zhang, Yuxin Chen, Chi Xu
Summary: We investigate the cascading effects of microplastic ingestion by fish on both upper and lower trophic levels in a well-studied aquatic ecosystem model, and find that increasing microplastics in planktivorous fish can cause population structure effects and abrupt declines in fish biomass and reproduction, leading to an ecosystem-level tipping point.
JOURNAL OF ANIMAL ECOLOGY
(2023)
Article
Geography, Physical
Zhenyu Ni, Enlou Zhang, Weiwei Sun, Xianqiang Meng, Dongliang Ning, Qingfeng Jiang, Wenxiu Zheng
Summary: Lake ecosystems in arid Central Asia are facing crisis due to water extraction and eutrophication, with significant impacts from both climate change and human activities. The evolution of Lake Ulungur over the past 4550 years has been influenced by changes in hydrological status, salinity, and freshwater chironomid species, primarily driven by Northern Hemisphere insolation and human population surges related to national policies. Urgent action is needed to protect lake ecosystems in Central Asia from the unprecedented anthropogenic pressures caused by global warming and intensifying human activities.
QUATERNARY INTERNATIONAL
(2022)
Article
Biodiversity Conservation
Andrey N. Tsyganov, Elena A. Malysheva, Yuri A. Mazei, K. Anggi Hapsari, Hermann Behling, Supiandi Sabiham, Siria Biagioni, Valentyna Krashevska
Summary: This study aims to describe the morphospecies composition of sub-fossil testate amoebae in a tropical peatland in Central Sumatra during the Holocene and reconstruct the hydrological regime using morphospecies- and functional-trait-based approaches. The results show three main periods of peatland development and suggest that the morphospecies-based method provides a more reliable reconstruction compared to the functional trait-based method. Future studies on the functional and morphospecies composition of testate amoebae in a wider range of tropical peatlands are needed to improve the quality of hydrological reconstructions.
Article
Geography, Physical
Shixin Huang, Ke Zhang, Qi Lin, Giri Kattel, Ji Shen
Summary: This study investigates the regime shifts of freshwater ecosystems in intensive agricultural landscapes and their drivers. By analyzing a century-scale paleolimnological record from Gaoyou Lake in China, the researchers reveal significant ecological shifts and identify agricultural intensification and climate change as the main drivers. The study also highlights the importance of rate-focused management strategies in minimizing the risk of catastrophic ecological shifts in aquatic ecosystems.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Biodiversity Conservation
Ting Liu, Shuai Ouyang, Mengmeng Gou, Hailiang Tang, Yue Liu, Liang Chen, Pifeng Lei, Zhonghui Zhao, Chuanhong Xu, Wenhua Xiang
Summary: This paper examines the urban heat island (UHI) effect in the context of rapid urbanization in China, and investigates the impact of landscape configuration and composition on UHI. The study finds that land use changes driven by urbanization are spatially associated with UHI, and the UHI effect gradually decreases along the urban-rural gradient. Additionally, the study identifies a tipping point where the combined effects of source and sink landscapes on UHI significantly decrease. Moreover, the study highlights the importance of controlling the optimal area ratio of source-sink landscapes for mitigating the UHI effect during urban development and planning.
Article
Environmental Sciences
Rudi Voss, Martin Quaas
Summary: The study expands on the theoretical literature by analyzing an empirical model of age-structured population dynamics and allowing for the possibility of a back-shift from a bad into a good regime. It finds that with a higher probability of a shift back to the more productive regime, the optimal management of the fishery becomes more conservative in the short run. This highlights the importance of reducing eutrophication to increase the probability of a regime shift back to high reproductive potential of the Eastern Baltic cod fishery.
NATURAL RESOURCE MODELING
(2022)
Article
Ecology
Marco Saltini, Paula Vasconcelos, Claus Rueffler
Summary: Most animals undergo ontogenetic niche shifts during their life, but standard ecological theory tends to ignore this complexity. This study investigates how complex life cycles, where juvenile and adult individuals feed on different resources, impact community richness. Results show that under gradual evolution, complex life cycles can lead to both higher and lower species richness compared to simple life cycles with no ontogenetic niche shift. However, complex life cycles can significantly increase species richness when communities are assembled through immigration, as immigrants can occupy isolated peaks of the fitness landscape.
Article
Environmental Sciences
Dai Zhang, Weiming Xie, Jian Shen, Leicheng Guo, Yu Chen, Qing He
Summary: This article studies the tidal dynamics and spatial variability of the mudbank in the Yangtze Estuary, revealing the transition of the mudbank from a sediment sink to a sediment source. The study finds that the tidal range increased, salinity dynamics changed, and the landward sediment budget increased, resulting in more severe erosion in the mudbank.
INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
(2022)
Article
Computer Science, Information Systems
Guobing Qian, Xin Yu, Jiaojiao Mei, Junzhu Liu, Shiyuan Wang
Summary: This paper proposes a class of adaptive filtering algorithms based on fixed-point instead of gradient descent to overcome the limitations of current algorithms in weight error and convergence speed. By properly utilizing the lemma of matrix inversion, the massive calculation of matrix inversion in traditional fixed-point based methods is avoided, and two alternative recursive algorithms are provided. Local convergence analysis of mean and mean square is performed, and simulated results show strong evidence for the superior performance of the proposed algorithms over WL-CLMS, WL-RLS, and MICCC.
INFORMATION SCIENCES
(2023)
Article
Environmental Sciences
Marie-Catherine Riekhof, Lotta Clara Kluger, Renato Salvatteci, Lotta Siebert, Rudi Voss
Summary: We introduce six steps to define a Window of Tipping Point Analysis to increase understanding of processes and tipping points in social-ecological systems. We use a mathematical model and two case studies to examine agency in preventing tipping, intertemporal developments and desired states. Our analysis suggests that the chosen window for analysis influences agency in tipping point management, occurrence of tipping points, and desirable states.
NATURAL RESOURCE MODELING
(2022)
Article
Plant Sciences
Alice M. Milner, Andy J. Baird, Sophie M. Green, Graeme T. Swindles, Dylan M. Young, Nicole K. Sanderson, Madeleine S. Timmins, Mariusz Galka
Summary: Peatlands are globally important ecosystems that can undergo spontaneous recovery from degradation, transitioning from erosion to renewed carbon accumulation. By using a palaeoecological approach, a study in North Wales revealed rapid carbon accumulation in new peat, different successional pathways in peat-forming vegetation, and hydrological changes promoting carbon accumulation and protecting old carbon. External factors only partially explain the results, with internal ecosystem processes playing a significant role in the switch to renewed carbon accumulation. This study suggests that the tipping point to renewed carbon accumulation in degraded peatlands involves changes in the physical landscape.
JOURNAL OF ECOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Guobing Qian, Jiaojiao Mei, Herbert H. C. Iu, Shiyuan Wang
Summary: The study develops a fixed point maximum total complex correntropy (FP-MTCC) adaptive filtering algorithm to improve the performance of MTCC. The convergence analysis of the FP-MTCC is provided in the paper. Additionally, two recursive FP-MTCC (RFP-MTCC) algorithms are developed for online adaptive filtering with transient analysis.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2021)
Article
Engineering, Aerospace
Mostafa Khazaee, Iman Jahandideh, Jalal Karimi, Sayyed Majid Hosseini
Summary: The retirement time of helicopter components can be extended using HUMS and fatigue damage analysis. This study proposes a logical framework to identify complex maneuvers and classify flight regimes based on flight data and control information. The algorithm shows high accuracy and ease of embedding in HUMS software.
INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES
(2023)
Article
Engineering, Industrial
Meide Yang, Dequan Zhang, Chao Jiang, Xu Han, Qing Li
Summary: The study presents a hybrid adaptive Kriging-based approach to improve the efficiency and accuracy of solving complex RBDO problems with highly nonlinear constraints, by combining most probable points and chaos control methods.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2021)