For mankind’s survival and development,water,energy,and food(WEF)are essential material guarantees.In China,however,the spatial distribution of WEF is seriously unbalanced and mismatched.Here,a collaborative governan...For mankind’s survival and development,water,energy,and food(WEF)are essential material guarantees.In China,however,the spatial distribution of WEF is seriously unbalanced and mismatched.Here,a collaborative governance mechanism that aims at nexus security needs to be urgently established.In this paper,the Yellow River Basin in China with a representative WEF system,was selected as a case.Firstly,a comprehensive framework for WEF coupling coordination was constructed,and the relationship and mechanism between them were analyzed theoretically.Then,we investigated the spatiotemporal characteristics and driving mechanisms of the coupling coordination degree(CCD)with a composite evaluation method,coupling coordination degree model,spatial statistical analysis,and multiscale geographic weighted regression.Finally,policy implications were discussed to promote the coordinated development of the WEF system.The results showed that:1)WEF subsystems showed a significant imbalance of spatial pattern and diversity in temporal changes;2)the CCD for the WEF system varied little and remained at moderate coordination.Areas with moderate coordination have increased,while areas with superior coordination and mild disorder have decreased.In addition,the spatial clustering phenomenon of the CCD was significant and showed obvious characteristics of polarization;and 3)the action of each factor is self-differentiated and regionally variable.For different factors,GDP per capita was of particular importance,which contributed most to the regional development’s coupling coordination.For different regions,GDP per capita,average yearly precipitation,population density,and urbanization rate exhibited differences in geographical gradients in an east-west direction.The conclusion can provide references for regional resource allocation and sustainable development by enhancing WEF system utilization efficiency.展开更多
Quantum algorithms have demonstrated provable speedups over classical counterparts,yet establishing a comprehensive theoretical framework to understand the quantum advantage remains a core challenge.In this work,we de...Quantum algorithms have demonstrated provable speedups over classical counterparts,yet establishing a comprehensive theoretical framework to understand the quantum advantage remains a core challenge.In this work,we decode the quantum search advantage by investigating the critical role of quantum state properties in random-walk-based algorithms.We propose three distinct variants of quantum random-walk search algorithms and derive exact analytical expressions for their success probabilities.These probabilities are fundamentally determined by specific initial state properties:the coherence fraction governs the first algorithm’s performance,while entanglement and coherence dominate the outcomes of the second and third algorithms,respectively.We show that increased coherence fraction enhances success probability,but greater entanglement and coherence reduce it in the latter two cases.These findings reveal fundamental insights into harnessing quantum properties for advantage and guide algorithm design.Our searches achieve Grover-like speedups and show significant potential for quantum-enhanced machine learning.展开更多
In October 2024,at the 27th ChinaASEAN Leaders'Meeting,the leaders of China and ten ASEAN nations announced the substantial conclusion of the China-ASEAN FTA 3.0 Upgrade Negotiations,and proposed that the two side...In October 2024,at the 27th ChinaASEAN Leaders'Meeting,the leaders of China and ten ASEAN nations announced the substantial conclusion of the China-ASEAN FTA 3.0 Upgrade Negotiations,and proposed that the two sides would strive to formally sign in 2025 the Protocol on Further Upgrading the China-ASEAN Comprehensive Economic Cooperation Framework Agreement and pertinent agreements under the Agreement.展开更多
Congo River has abundant hydropower resources,and large-scale cascade power stations,such as the Grand Inga,can be constructed in downstream locations.However,the fragile economic foundations of the Democratic Republi...Congo River has abundant hydropower resources,and large-scale cascade power stations,such as the Grand Inga,can be constructed in downstream locations.However,the fragile economic foundations of the Democratic Republic of the Congo and neighbor!ng Central African countries,and the small-scale regional power consumption market prohibit the implementation of large-scale hydro power projects.As the high-voltage,I on g-dista nee power transmission tech no logy matures,hydropower from the Grand Inga can be delivered to load centers in other regions of Africa.This study establishes a 6 dime nsional comprehe nsive assessment model using the best-worst method to evaluate large-scale,I on g-distance,cross-border power intercon necti on projects.The model is applied to evaluate all the can didate in ter-regional power delivery schemes of the Inga III hydropower station,and the evaluation results can effectively help investment institutions and policy makers in policy making and potential market targeting.展开更多
On May 9,a signing ceremony of a comprehensive strategic cooperation framework agreement was held at Aluminum Corporation of China headquarters with Bayannur City,marking the formal establishment of a strategic partne...On May 9,a signing ceremony of a comprehensive strategic cooperation framework agreement was held at Aluminum Corporation of China headquarters with Bayannur City,marking the formal establishment of a strategic partnership between the two parties.展开更多
’Adhering to the establishment of the system of socialist rule of law with Chinese characteristics’is an original and contemporary concept and theory proposed by General Secretary Xi Jinping,and is the core essence ...’Adhering to the establishment of the system of socialist rule of law with Chinese characteristics’is an original and contemporary concept and theory proposed by General Secretary Xi Jinping,and is the core essence of Xi Jinping Thought on the Rule of Law.Establishing a system of socialist rule of law with Chinese characteristics is not only the general goal of overall law-based governance,but also the general starting point for overall law-based governance,and it is also the only way to establish a country of socialist rule of law.General Secretary Xi Jinping incisively discussed the scientific connotation and key tasks of establishing a system of socialist rule of law with Chinese characteristics,that is,under the leadership of the Communist Party of China,we need to uphold the socialist system with Chinese characteristics,put into practice the theory of socialist rule of law with Chinese characteristics,form a complete system of laws and regulations,a highly effective enforcement system of the rule of law,a stringent supervision system of the rule of law,and a robust guarantee system of the rule of law,and form a sound system of intra-Party regulations.展开更多
基金Under the auspices of Graduate Innovation Program of China University of Mining and Technology (No.2022WLKXJ095)National Natural Science Foundation of China (No.71874192)Youth Project of Fundamental Research Funds for the Central Universities (No.2021QN1076)。
文摘For mankind’s survival and development,water,energy,and food(WEF)are essential material guarantees.In China,however,the spatial distribution of WEF is seriously unbalanced and mismatched.Here,a collaborative governance mechanism that aims at nexus security needs to be urgently established.In this paper,the Yellow River Basin in China with a representative WEF system,was selected as a case.Firstly,a comprehensive framework for WEF coupling coordination was constructed,and the relationship and mechanism between them were analyzed theoretically.Then,we investigated the spatiotemporal characteristics and driving mechanisms of the coupling coordination degree(CCD)with a composite evaluation method,coupling coordination degree model,spatial statistical analysis,and multiscale geographic weighted regression.Finally,policy implications were discussed to promote the coordinated development of the WEF system.The results showed that:1)WEF subsystems showed a significant imbalance of spatial pattern and diversity in temporal changes;2)the CCD for the WEF system varied little and remained at moderate coordination.Areas with moderate coordination have increased,while areas with superior coordination and mild disorder have decreased.In addition,the spatial clustering phenomenon of the CCD was significant and showed obvious characteristics of polarization;and 3)the action of each factor is self-differentiated and regionally variable.For different factors,GDP per capita was of particular importance,which contributed most to the regional development’s coupling coordination.For different regions,GDP per capita,average yearly precipitation,population density,and urbanization rate exhibited differences in geographical gradients in an east-west direction.The conclusion can provide references for regional resource allocation and sustainable development by enhancing WEF system utilization efficiency.
基金supported by the Fundamental Research Funds for the Central Universities,the National Natural Science Foundation of China(Grant Nos.12371132,12075159,12171044,12071179,and 12405006)the specific research fund of the Innovation Platform for Academicians of Hainan Province.
文摘Quantum algorithms have demonstrated provable speedups over classical counterparts,yet establishing a comprehensive theoretical framework to understand the quantum advantage remains a core challenge.In this work,we decode the quantum search advantage by investigating the critical role of quantum state properties in random-walk-based algorithms.We propose three distinct variants of quantum random-walk search algorithms and derive exact analytical expressions for their success probabilities.These probabilities are fundamentally determined by specific initial state properties:the coherence fraction governs the first algorithm’s performance,while entanglement and coherence dominate the outcomes of the second and third algorithms,respectively.We show that increased coherence fraction enhances success probability,but greater entanglement and coherence reduce it in the latter two cases.These findings reveal fundamental insights into harnessing quantum properties for advantage and guide algorithm design.Our searches achieve Grover-like speedups and show significant potential for quantum-enhanced machine learning.
文摘In October 2024,at the 27th ChinaASEAN Leaders'Meeting,the leaders of China and ten ASEAN nations announced the substantial conclusion of the China-ASEAN FTA 3.0 Upgrade Negotiations,and proposed that the two sides would strive to formally sign in 2025 the Protocol on Further Upgrading the China-ASEAN Comprehensive Economic Cooperation Framework Agreement and pertinent agreements under the Agreement.
基金National Key Reaearch and Development Program of China(2016YFB0900400).
文摘Congo River has abundant hydropower resources,and large-scale cascade power stations,such as the Grand Inga,can be constructed in downstream locations.However,the fragile economic foundations of the Democratic Republic of the Congo and neighbor!ng Central African countries,and the small-scale regional power consumption market prohibit the implementation of large-scale hydro power projects.As the high-voltage,I on g-dista nee power transmission tech no logy matures,hydropower from the Grand Inga can be delivered to load centers in other regions of Africa.This study establishes a 6 dime nsional comprehe nsive assessment model using the best-worst method to evaluate large-scale,I on g-distance,cross-border power intercon necti on projects.The model is applied to evaluate all the can didate in ter-regional power delivery schemes of the Inga III hydropower station,and the evaluation results can effectively help investment institutions and policy makers in policy making and potential market targeting.
文摘On May 9,a signing ceremony of a comprehensive strategic cooperation framework agreement was held at Aluminum Corporation of China headquarters with Bayannur City,marking the formal establishment of a strategic partnership between the two parties.
文摘’Adhering to the establishment of the system of socialist rule of law with Chinese characteristics’is an original and contemporary concept and theory proposed by General Secretary Xi Jinping,and is the core essence of Xi Jinping Thought on the Rule of Law.Establishing a system of socialist rule of law with Chinese characteristics is not only the general goal of overall law-based governance,but also the general starting point for overall law-based governance,and it is also the only way to establish a country of socialist rule of law.General Secretary Xi Jinping incisively discussed the scientific connotation and key tasks of establishing a system of socialist rule of law with Chinese characteristics,that is,under the leadership of the Communist Party of China,we need to uphold the socialist system with Chinese characteristics,put into practice the theory of socialist rule of law with Chinese characteristics,form a complete system of laws and regulations,a highly effective enforcement system of the rule of law,a stringent supervision system of the rule of law,and a robust guarantee system of the rule of law,and form a sound system of intra-Party regulations.
