This study analyzes the cooperative coalition problem for formation scheduling based on incomplete information. A multi-agent cooperative coalition framework is developed to optimize the formation scheduling problem i...This study analyzes the cooperative coalition problem for formation scheduling based on incomplete information. A multi-agent cooperative coalition framework is developed to optimize the formation scheduling problem in a decentralized manner. The social class differentiation mech- anism and role-assuming mechanism are incorporated into the framework, which, in turn, ensures that the multi-agent system (MAS) evolves in the optimal direction. Moreover, a further differen- tiation pressure can be achieved to help MAS escape from local optima. A Bayesian coalition nego- tiation algorithm is constructed, within which the Harsanyi transformation is introduced to transform the coalition problem based on incomplete information to the Bayesian-equivalent coali- tion problem based on imperfect information. The simulation results suggest that the distribution of agents' expectations of other agents' unknown information approximates to the true distribution after a finite set of generations. The comparisons indicate that the MAS cooperative coalition algo- rithm produces a significantly better utility and possesses a more effective capability of escaping from local optima than the proposal-engaged marriage algorithm and the Simulated Annealing algorithm.展开更多
The West Qinling orogen in central China,formed from continental collision between the North China and Yangtze cratons in the Late Triassic,hosts numerous gold deposits with a total Au endowment of about 2000 t.Most d...The West Qinling orogen in central China,formed from continental collision between the North China and Yangtze cratons in the Late Triassic,hosts numerous gold deposits with a total Au endowment of about 2000 t.Most deposits were emplaced at ca.250-195 Ma and are genetically associated with the Triassic orogenesis.Here in situ U-Pb titanite dating with laser ablation inductively coupled plasma mass spectrometry indicates the Ma’anqiao gold deposit in the northern portion of this orogen has a distinctive age and under a contrasting tectonic regime.This structurally controlled gold deposit is hosted in Late Ordovician to Early Silurian sub-greenschist facies metasedimentary rocks.The gold mineralization is hosted in quartz-pyritepyrrhotite veins and pyrite-pyrrhotite disseminations in hydrothermally altered rocks,which are crosscut by K-feldspar-calcitechlorite±pyrite veins.Titanite,present both in the disseminated sulfide ores and later veins,was used for in situ U-Pb dating.Titanite from three disseminated sulfide ore samples with Th and U averaging 27.46 and 39.31 ppm(1 ppm=1μg g^(-1)),respectively,yielded lower-intercept ages of 121.1±3.1 to 120.7±3.5 Ma(2σ)in the Tera-Wasserburg diagram.Titanite from three later vein samples with much lower Th and U concentrations averaging 2.74 and 16.21 ppm,respectively,yielded overlapping ages of 120.8±3.2 to 120.3±5.8 Ma(2σ).These new titanite U-Pb ages tightly constrain the formation of the Ma’anqiao gold deposit at ca.121-120 Ma and,when combined with independent geological data,indicate it is not related to the Triassic Qinling orogeny.Rather,its formation is attributed to lithospheric thinning and destruction of the North China craton during the Late Jurassic to Early Cretaceous which has generated numerous gold deposits along the southern margin of this craton.This catastrophic event caused extensive magmatism in large areas of the North Qinling terrane and northern edge of the West Qinling orogen immediately to the south of the North China craton.The heat flux and elevated geothermal gradients associated with this magmatism could have induced prograde metamorphism of the Paleozoic sedimentary infrastructure in and beneath these areas with the derived fluids ascending along pre-existing crustal-scale regional structures to form the Ma’anqiao gold deposit.We suggest that areas in the North Qinling terrane that have been affected by the Late Mesozoic magmatism are potential targets for future exploration of the decratonization-related gold deposits.Additionally,this study highlights the use of titanite U-Pb dating as a robust geochronometer for metasedimentary rock-hosted gold deposits in Phanerozoic orogens,which has previously not been utilized.展开更多
Knowledge on the origin and mechanism of the large potash formation in the southeast Tethyan tectonic domain are still under debate,one of which mainly due to the controversial ages of the potash-bearing strata.Here w...Knowledge on the origin and mechanism of the large potash formation in the southeast Tethyan tectonic domain are still under debate,one of which mainly due to the controversial ages of the potash-bearing strata.Here we present a detailed detrital zircon U-Pb geochronologic-magnetostratigraphic study of the potash-bearing Mengyejing(MYJ)Formation(Fm)from the Simao Basin.948 paleomagnetic cores and 4 detrital zircon U-Pb samples were collected from a 932-m thick Jiangcheng section.Thermal demagnetization isolated 857 primary characteristic remnant magnetization(ChRM)directions,indicated by positive reversals and fold tests and petrologic examinations.Seven normal and seven reversed polarity zones were identified and correlated well with chrons C27r to C34n of the geomagnetic polarity timescale(GPTS2012),yielding the first known age sequence of>112 to~63 Ma for the MYJ Fm.The ages for the potash bearing strata in the Simao commenced~20 Ma earlier than those in the adjacent Khorat basins,opposite to the traditional viewpoint that the former would rather correspond to the middle and lower parts of the latter.Given the paleogeographic reconstruction of likely a pan-Simao-Khorat basin during the Cretaceous,~85 Ma would be another important potential period for future potash exploration in the Simao Basin.展开更多
任务分配方法是任务控制过程的重要组成部分,是编队协同作战指挥策略的关键。以合同网协议(contract net protocol,CNP)和多智能体系统(multi-agent system,MAS)理论为基础,建立了有人机/无人机编队MAS结构和基于投标过程的任务分配模型...任务分配方法是任务控制过程的重要组成部分,是编队协同作战指挥策略的关键。以合同网协议(contract net protocol,CNP)和多智能体系统(multi-agent system,MAS)理论为基础,建立了有人机/无人机编队MAS结构和基于投标过程的任务分配模型,将任务优先权引入任务分配模型中,可以实现预先任务分配和执行过程中动态任务分配,保证动态环境下编队整体分配效能较优。针对作战想定进行了仿真计算,结果表明,基于CNP和MAS理论的有人机/无人机编队协同任务分配策略具有良好的预先任务分配和实时任务分配效果,能够满足编队作战任务的需要。展开更多
基金supported by the National Natural Science Foundation of China(No.61039001)the National Science and Technology Support Program of China(No.2011BAH24B10)
文摘This study analyzes the cooperative coalition problem for formation scheduling based on incomplete information. A multi-agent cooperative coalition framework is developed to optimize the formation scheduling problem in a decentralized manner. The social class differentiation mech- anism and role-assuming mechanism are incorporated into the framework, which, in turn, ensures that the multi-agent system (MAS) evolves in the optimal direction. Moreover, a further differen- tiation pressure can be achieved to help MAS escape from local optima. A Bayesian coalition nego- tiation algorithm is constructed, within which the Harsanyi transformation is introduced to transform the coalition problem based on incomplete information to the Bayesian-equivalent coali- tion problem based on imperfect information. The simulation results suggest that the distribution of agents' expectations of other agents' unknown information approximates to the true distribution after a finite set of generations. The comparisons indicate that the MAS cooperative coalition algo- rithm produces a significantly better utility and possesses a more effective capability of escaping from local optima than the proposal-engaged marriage algorithm and the Simulated Annealing algorithm.
基金financially supported by the National Natural Science Foundation of China(Grant No.42130814)。
文摘The West Qinling orogen in central China,formed from continental collision between the North China and Yangtze cratons in the Late Triassic,hosts numerous gold deposits with a total Au endowment of about 2000 t.Most deposits were emplaced at ca.250-195 Ma and are genetically associated with the Triassic orogenesis.Here in situ U-Pb titanite dating with laser ablation inductively coupled plasma mass spectrometry indicates the Ma’anqiao gold deposit in the northern portion of this orogen has a distinctive age and under a contrasting tectonic regime.This structurally controlled gold deposit is hosted in Late Ordovician to Early Silurian sub-greenschist facies metasedimentary rocks.The gold mineralization is hosted in quartz-pyritepyrrhotite veins and pyrite-pyrrhotite disseminations in hydrothermally altered rocks,which are crosscut by K-feldspar-calcitechlorite±pyrite veins.Titanite,present both in the disseminated sulfide ores and later veins,was used for in situ U-Pb dating.Titanite from three disseminated sulfide ore samples with Th and U averaging 27.46 and 39.31 ppm(1 ppm=1μg g^(-1)),respectively,yielded lower-intercept ages of 121.1±3.1 to 120.7±3.5 Ma(2σ)in the Tera-Wasserburg diagram.Titanite from three later vein samples with much lower Th and U concentrations averaging 2.74 and 16.21 ppm,respectively,yielded overlapping ages of 120.8±3.2 to 120.3±5.8 Ma(2σ).These new titanite U-Pb ages tightly constrain the formation of the Ma’anqiao gold deposit at ca.121-120 Ma and,when combined with independent geological data,indicate it is not related to the Triassic Qinling orogeny.Rather,its formation is attributed to lithospheric thinning and destruction of the North China craton during the Late Jurassic to Early Cretaceous which has generated numerous gold deposits along the southern margin of this craton.This catastrophic event caused extensive magmatism in large areas of the North Qinling terrane and northern edge of the West Qinling orogen immediately to the south of the North China craton.The heat flux and elevated geothermal gradients associated with this magmatism could have induced prograde metamorphism of the Paleozoic sedimentary infrastructure in and beneath these areas with the derived fluids ascending along pre-existing crustal-scale regional structures to form the Ma’anqiao gold deposit.We suggest that areas in the North Qinling terrane that have been affected by the Late Mesozoic magmatism are potential targets for future exploration of the decratonization-related gold deposits.Additionally,this study highlights the use of titanite U-Pb dating as a robust geochronometer for metasedimentary rock-hosted gold deposits in Phanerozoic orogens,which has previously not been utilized.
基金supported by the National Basic Research Program of China(Grant Nos.2011CB403000,2017YFC0602803)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDA20070201)+2 种基金the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(Grant No.2019QZKK0707)the National Natural Science Foundation of China(Grant Nos.41988101,41907263,41974080)the Funding of the Qingtan Scholar Talent Project of Zaozhuang University。
文摘Knowledge on the origin and mechanism of the large potash formation in the southeast Tethyan tectonic domain are still under debate,one of which mainly due to the controversial ages of the potash-bearing strata.Here we present a detailed detrital zircon U-Pb geochronologic-magnetostratigraphic study of the potash-bearing Mengyejing(MYJ)Formation(Fm)from the Simao Basin.948 paleomagnetic cores and 4 detrital zircon U-Pb samples were collected from a 932-m thick Jiangcheng section.Thermal demagnetization isolated 857 primary characteristic remnant magnetization(ChRM)directions,indicated by positive reversals and fold tests and petrologic examinations.Seven normal and seven reversed polarity zones were identified and correlated well with chrons C27r to C34n of the geomagnetic polarity timescale(GPTS2012),yielding the first known age sequence of>112 to~63 Ma for the MYJ Fm.The ages for the potash bearing strata in the Simao commenced~20 Ma earlier than those in the adjacent Khorat basins,opposite to the traditional viewpoint that the former would rather correspond to the middle and lower parts of the latter.Given the paleogeographic reconstruction of likely a pan-Simao-Khorat basin during the Cretaceous,~85 Ma would be another important potential period for future potash exploration in the Simao Basin.
文摘任务分配方法是任务控制过程的重要组成部分,是编队协同作战指挥策略的关键。以合同网协议(contract net protocol,CNP)和多智能体系统(multi-agent system,MAS)理论为基础,建立了有人机/无人机编队MAS结构和基于投标过程的任务分配模型,将任务优先权引入任务分配模型中,可以实现预先任务分配和执行过程中动态任务分配,保证动态环境下编队整体分配效能较优。针对作战想定进行了仿真计算,结果表明,基于CNP和MAS理论的有人机/无人机编队协同任务分配策略具有良好的预先任务分配和实时任务分配效果,能够满足编队作战任务的需要。