The catastrophic rockslide,which frequently triggers numerous severe disasters worldwide,has drawn much attention globally;however,understanding the initiation mechanism of catastrophic rockslides in the absence of ty...The catastrophic rockslide,which frequently triggers numerous severe disasters worldwide,has drawn much attention globally;however,understanding the initiation mechanism of catastrophic rockslides in the absence of typical single triggering factors related to strong seismic activity or torrential precipitation continues to be challenging within the global scientific community.This study aims to determine the mechanism of the three largest catastrophic rockslides in the eastern Tibetan Plateau,Yigong,Xinmo,and Baige,over the past 20 years using field investigation,remote sensing,and runoff analysis.Instead of the conventional driving factors of heavy rainfall and strong earthquakes,the multi-wing butterfly effects(MWBE)of climatic factors and weak earthquakes are for the first time identified as drivers of the catastrophic rockslide disasters.First,strong tectonic uplift,fast fluvial incision,high-density faults,and large regional water confluence formed the slopes in the critical regime,creating the source conditions of rockslide.Second,the MWBE of early dry-heat events and antecedent rainfall,combined with imminent weak earthquakes,initiated rockslide.Third,the delayed amplified runoff moving toward the sliding surface and lowering the strength of the locking-rock segment constituted the fundamental mechanism of the MWBE on rockslide.The catastrophic rockslide was ultimately inferred to be a nonlinear chaotic process;however,prediction and forecasting of rockslide based on the MWBE in the early stages are possible and essential.This finding presents a new perspective concerning forecasting progressive landslides.展开更多
Regeneration of damaged innervations in the peripheral nervous system （PNS） has been well documented in both animals and human. After injury, the damaged neurite swells and undergoes retrograde degeneration. Once th...Regeneration of damaged innervations in the peripheral nervous system （PNS） has been well documented in both animals and human. After injury, the damaged neurite swells and undergoes retrograde degeneration. Once the debris is cleared, it begins to sprout and restore damaged connections. Damaged axons are able to regrow as long as the perikarya are intact and have made contact with the Schwann cells in the endoneurial channel[2]. Under appropriate conditions,展开更多
Right after Lehman Brothers declared bankruptcy a series of bad news came one after another.Merrill Lynch was bought out.American International Group(AIG)was handed over to the U.S.government. Washington Mutual,the la...Right after Lehman Brothers declared bankruptcy a series of bad news came one after another.Merrill Lynch was bought out.American International Group(AIG)was handed over to the U.S.government. Washington Mutual,the largest savings bank in the U.S.,was said to be looking for a buyer.In Rus- sia,stock exchange was forced to a suspension due to a record slump in 10 years in its stock market. It seems that the end of the Moon Festival this year marked the beginning of a global financial crisis。展开更多
Based on the theory of geo-economy,under the new situation of global economy,information network and China’s entry into WTO,also with the holding of APEC (in 2001) and the International Exposition in the near future,...Based on the theory of geo-economy,under the new situation of global economy,information network and China’s entry into WTO,also with the holding of APEC (in 2001) and the International Exposition in the near future,the Changjiang (Yangtze) River Delta is striding toward the spectacular international multi-polar situation and becomes one of core regions with high-speed development. Facing the ocean and world all along,leading the progressive tides of the age and scintillating the splendor of the nation,she does advance with time. Through a long period of irrigation projects construction and intensive operation of lands in previous agricultural society,the artificial wetland ecosystem with a positive cycle had ever been formed in this region. At present,environmental pollution and urban expansion resulted from post-industrialization are being rectified. The delta will be the paradigm of industrial and agricultural modernization along the sustainable development road. With the rapid development of urbanization,she has been one of the regions with the highest density population and high urbanization level. Taking the Changjiang River estuary and the Hangzhou Bay as two parts,she is continuously strengthening and adjusting her interior structure,expanding mothball space and constructing the oriental modern "logistics center" to link the whole world. The butterfly-style urban system of the Changjiang River Delta is flying,probably engendering earthshaking "butterfly effect".展开更多
The feedback control of a delayed dynamical system, which also includes various chaotic systems with time delays, is investigated. On the basis of stability analysis of a nonautonomous system with delays, some simple ...The feedback control of a delayed dynamical system, which also includes various chaotic systems with time delays, is investigated. On the basis of stability analysis of a nonautonomous system with delays, some simple yet less conservative criteria are obtained for feedback control in a delayed dynamical system. Finally, the theoretical result is applied to a typical class of chaotic Lorenz system and Chua circuit with delays. Numerical simulations are also given to verify the theoretical results.展开更多
A Yale-led study warns that global climate change may have a destructive effect on many butterfly populations worldwide,turning their species-rich mountain habitats from shelters into traps.Think of it as the"but...A Yale-led study warns that global climate change may have a destructive effect on many butterfly populations worldwide,turning their species-rich mountain habitats from shelters into traps.Think of it as the"butterfly effect"-the idea that something as tiny as a butterfly moving its wings can eventually cause a big event like a hurricane-the opposite way around.展开更多
The deterministic chaos in nonlinear systems was discovered by Edward N.Lorenz in 1963,marking the birth of nonlinear sciences.Since then,the sensitivity of predictions to initial conditions is characterized by the“b...The deterministic chaos in nonlinear systems was discovered by Edward N.Lorenz in 1963,marking the birth of nonlinear sciences.Since then,the sensitivity of predictions to initial conditions is characterized by the“butterfly effect”,triggering a scientific revolution that has lasted more than half a century and spans multiple disciplines.This article presents a perspective on the classic paper of the“butterfly effect”,which not only help reveal how pioneers challenged the infinite unknown under limited conditions to establish the foundational work,but also demonstrates how these seminal ideas inspired successors to transcend existing paradigms,unlock creative thinking,and achieve cross-disciplinary innovations.The Lorenz's theory of deterministic chaos reveals that even imperceptibly small errors in the initial state can grow to the extent that makes it impossible to forecast at arbitrary future times with acceptable errors.This recognition shook the classical physics view that“determinism implies complete predictability”and prompted meteorologists to shift from the pursuit of“long-term forecasts”to asking“how far into the future the atmosphere is predictable”,and from attempts at“perfect prediction”to scientifically“quantifying forecast uncertainty”.This transition has also fundamentally promoted the shift of the paradigms in weather forecast and subsequent climate prediction,exerted profound influence on mathematics,biology and economics,and even permeated literature,art,history and social governance—ultimately shaping the renowned Lorenz's chaos theory.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.U20A20110)the Second Tibetan Plateau Scientific Expedition and Research Program(Grant No.2019QZKK0906)+2 种基金the Key R&D Projects of Tibet Autonomous Region Science and Technology Pro ject(Grant No.XZ202101ZD0013G)the International Cooperation Overseas Platform Project,CAS(Grant No.131C11KYSB20200033)the Outstanding Talent Project of Thousand Talents Program in China.
文摘The catastrophic rockslide,which frequently triggers numerous severe disasters worldwide,has drawn much attention globally;however,understanding the initiation mechanism of catastrophic rockslides in the absence of typical single triggering factors related to strong seismic activity or torrential precipitation continues to be challenging within the global scientific community.This study aims to determine the mechanism of the three largest catastrophic rockslides in the eastern Tibetan Plateau,Yigong,Xinmo,and Baige,over the past 20 years using field investigation,remote sensing,and runoff analysis.Instead of the conventional driving factors of heavy rainfall and strong earthquakes,the multi-wing butterfly effects(MWBE)of climatic factors and weak earthquakes are for the first time identified as drivers of the catastrophic rockslide disasters.First,strong tectonic uplift,fast fluvial incision,high-density faults,and large regional water confluence formed the slopes in the critical regime,creating the source conditions of rockslide.Second,the MWBE of early dry-heat events and antecedent rainfall,combined with imminent weak earthquakes,initiated rockslide.Third,the delayed amplified runoff moving toward the sliding surface and lowering the strength of the locking-rock segment constituted the fundamental mechanism of the MWBE on rockslide.The catastrophic rockslide was ultimately inferred to be a nonlinear chaotic process;however,prediction and forecasting of rockslide based on the MWBE in the early stages are possible and essential.This finding presents a new perspective concerning forecasting progressive landslides.
文摘Regeneration of damaged innervations in the peripheral nervous system （PNS） has been well documented in both animals and human. After injury, the damaged neurite swells and undergoes retrograde degeneration. Once the debris is cleared, it begins to sprout and restore damaged connections. Damaged axons are able to regrow as long as the perikarya are intact and have made contact with the Schwann cells in the endoneurial channel[2]. Under appropriate conditions,
文摘Right after Lehman Brothers declared bankruptcy a series of bad news came one after another.Merrill Lynch was bought out.American International Group(AIG)was handed over to the U.S.government. Washington Mutual,the largest savings bank in the U.S.,was said to be looking for a buyer.In Rus- sia,stock exchange was forced to a suspension due to a record slump in 10 years in its stock market. It seems that the end of the Moon Festival this year marked the beginning of a global financial crisis。
文摘Based on the theory of geo-economy,under the new situation of global economy,information network and China’s entry into WTO,also with the holding of APEC (in 2001) and the International Exposition in the near future,the Changjiang (Yangtze) River Delta is striding toward the spectacular international multi-polar situation and becomes one of core regions with high-speed development. Facing the ocean and world all along,leading the progressive tides of the age and scintillating the splendor of the nation,she does advance with time. Through a long period of irrigation projects construction and intensive operation of lands in previous agricultural society,the artificial wetland ecosystem with a positive cycle had ever been formed in this region. At present,environmental pollution and urban expansion resulted from post-industrialization are being rectified. The delta will be the paradigm of industrial and agricultural modernization along the sustainable development road. With the rapid development of urbanization,she has been one of the regions with the highest density population and high urbanization level. Taking the Changjiang River estuary and the Hangzhou Bay as two parts,she is continuously strengthening and adjusting her interior structure,expanding mothball space and constructing the oriental modern "logistics center" to link the whole world. The butterfly-style urban system of the Changjiang River Delta is flying,probably engendering earthshaking "butterfly effect".
基金Project supported by the Natural Science Foundation of Chongqing City,China(Grant No.2005BB8085)the Chongqing Municipal Education Commission Project,China(Grant No.KJ080622)
文摘The feedback control of a delayed dynamical system, which also includes various chaotic systems with time delays, is investigated. On the basis of stability analysis of a nonautonomous system with delays, some simple yet less conservative criteria are obtained for feedback control in a delayed dynamical system. Finally, the theoretical result is applied to a typical class of chaotic Lorenz system and Chua circuit with delays. Numerical simulations are also given to verify the theoretical results.
文摘A Yale-led study warns that global climate change may have a destructive effect on many butterfly populations worldwide,turning their species-rich mountain habitats from shelters into traps.Think of it as the"butterfly effect"-the idea that something as tiny as a butterfly moving its wings can eventually cause a big event like a hurricane-the opposite way around.
基金supported by funding from the National Natural Science Foundation of China(Grant No.42330111)。
文摘The deterministic chaos in nonlinear systems was discovered by Edward N.Lorenz in 1963,marking the birth of nonlinear sciences.Since then,the sensitivity of predictions to initial conditions is characterized by the“butterfly effect”,triggering a scientific revolution that has lasted more than half a century and spans multiple disciplines.This article presents a perspective on the classic paper of the“butterfly effect”,which not only help reveal how pioneers challenged the infinite unknown under limited conditions to establish the foundational work,but also demonstrates how these seminal ideas inspired successors to transcend existing paradigms,unlock creative thinking,and achieve cross-disciplinary innovations.The Lorenz's theory of deterministic chaos reveals that even imperceptibly small errors in the initial state can grow to the extent that makes it impossible to forecast at arbitrary future times with acceptable errors.This recognition shook the classical physics view that“determinism implies complete predictability”and prompted meteorologists to shift from the pursuit of“long-term forecasts”to asking“how far into the future the atmosphere is predictable”,and from attempts at“perfect prediction”to scientifically“quantifying forecast uncertainty”.This transition has also fundamentally promoted the shift of the paradigms in weather forecast and subsequent climate prediction,exerted profound influence on mathematics,biology and economics,and even permeated literature,art,history and social governance—ultimately shaping the renowned Lorenz's chaos theory.
