Workers who conduct regular facility inspections in radioactive environments will inevitably be affected by radiation.Therefore,it is important to optimize the inspection path to ensure that workers are exposed to the...Workers who conduct regular facility inspections in radioactive environments will inevitably be affected by radiation.Therefore,it is important to optimize the inspection path to ensure that workers are exposed to the least amount of radiation.This study proposes a discrete Rao-combined artificial bee colony(ABC)algorithm for planning inspection paths with minimum exposure doses in radioactive environments with obstacles.In this algorithm,retaining the framework of the traditional ABC algorithm,we applied the directional solution update rules of Rao algorithms at the employed bee stage and onlooker bee stage to increase the exploitation ability of the algorithm and implement discretion using the swap operator and swap sequence.To increase the randomness of solution generation,the chaos algorithm was used at the initialization stage.The K-opt operation technique was introduced at the scout bee stage to increase the exploration ability of the algorithm.For path planning in an environment with complex structural obstacles,an obstacle detour technique using a recursive algorithm was applied.To evaluate the performance of the proposed algorithm,we performed experimental simulations in three hypothetical environments and compared the results with those of improved particle swarm optimization,chaos particle swarm optimization,improved ant colony optimization,and discrete Rao’s algorithms.The experimental results show the high performance of the proposed discrete Rao-combined ABC algorithm and its obstacle detour capability.展开更多
For a more systematic understanding of the levels of environmental tritium and its behavior in East Asia,a database on environmental tritium was established based on the literature published in the past 30 years.Subse...For a more systematic understanding of the levels of environmental tritium and its behavior in East Asia,a database on environmental tritium was established based on the literature published in the past 30 years.Subsequently,the levels and behavior of the environmental tritium were further studied by statistical analyses.The results indicate that the distribution of environmental tritium is inhomogeneous and complex.In areas without nuclear facilities,the level of environmental tritium has decreased to its background level,even though a certain number of atmospheric nuclear tests were performed before 1980.In general,the level of atmospheric tritium was marginally higher than the levels in precipitation and surface water;the levels in shallow groundwater and seawater were considerably lower.Furthermore,the levels of tritium in the atmosphere,precipitation,and inland surface water were strongly correlated with latitude and distance from the coastline.In soil and living organisms,the level of tissue-free water tritium(TFWT)was comparable to the tritium levels in local rainfall,whereas the persistence of organically bound tritium(OBT)in the majority of organisms resulted in an OBT/TFWT ratio greater than one.Conversely,extremely high levels of environmental tritium were observed near certain nuclear power plants and the Fukushima accident sites.These results highlight the requirement to know the tritium baseline level and its behavior in the environment beforehand to better assess the impact of tritium discharge.Further investigations of environmental tritium in East Asia using more efficient and adequate monitoring methods are also required.展开更多
In response to the capabilities presented by the High-Intensity Heavy Ion Accelerator Facility(HIAF) and the Accelerator-Driven Subcritical System(Ci ADS), as well as the proposed Chinese Advanced Nuclear Physics Rese...In response to the capabilities presented by the High-Intensity Heavy Ion Accelerator Facility(HIAF) and the Accelerator-Driven Subcritical System(Ci ADS), as well as the proposed Chinese Advanced Nuclear Physics Research Facility(CNUF), we are assembling a consortium of experts in relevant disciplines, both domestically and internationally,to delineate high-precision physics experiments that leverage the state-of-the-art research environment afforded by CNUF.Our focus encompasses six primary domains of inquiry: hadron physics—including endeavors such as the super eta factory and investigations into light hadron structures;muon physics;neutrino physics;neutron physics;the testing of fundamental symmetries;and the exploration of quantum effects within nuclear physics, along with the utilization of vortex accelerators.We aim to foster a well-rounded portfolio of large, medium, and small-scale projects, thus unlocking new scientific avenues and optimizing the potential of the Huizhou large scientific facility. The aspiration for international leadership in scientific research will be a guiding principle in our strategic planning. This initiative will serve as a foundational reference for the Institute of Modern Physics in its strategic planning and goal-setting, ensuring alignment with its developmental objectives while striving to secure a competitive edge in technological advancement. Our ambition is to engage in substantive research within these realms of high-precision physics, to pursue groundbreaking discoveries, and to stimulate progress in China's nuclear physics landscape, positioning Huizhou as a preeminent global hub for advanced nuclear physics research.展开更多
Just when world leaders thought that they could breathe easily after the successful Iran nuclear deal,nuclear security issues have been catapulted to the top of their agendas following North Korea’s recent testing of...Just when world leaders thought that they could breathe easily after the successful Iran nuclear deal,nuclear security issues have been catapulted to the top of their agendas following North Korea’s recent testing of its nuclear bombs’capabilities.展开更多
文摘Workers who conduct regular facility inspections in radioactive environments will inevitably be affected by radiation.Therefore,it is important to optimize the inspection path to ensure that workers are exposed to the least amount of radiation.This study proposes a discrete Rao-combined artificial bee colony(ABC)algorithm for planning inspection paths with minimum exposure doses in radioactive environments with obstacles.In this algorithm,retaining the framework of the traditional ABC algorithm,we applied the directional solution update rules of Rao algorithms at the employed bee stage and onlooker bee stage to increase the exploitation ability of the algorithm and implement discretion using the swap operator and swap sequence.To increase the randomness of solution generation,the chaos algorithm was used at the initialization stage.The K-opt operation technique was introduced at the scout bee stage to increase the exploration ability of the algorithm.For path planning in an environment with complex structural obstacles,an obstacle detour technique using a recursive algorithm was applied.To evaluate the performance of the proposed algorithm,we performed experimental simulations in three hypothetical environments and compared the results with those of improved particle swarm optimization,chaos particle swarm optimization,improved ant colony optimization,and discrete Rao’s algorithms.The experimental results show the high performance of the proposed discrete Rao-combined ABC algorithm and its obstacle detour capability.
基金supported by the National Natural Science Foundation of China(Nos.11375048 and 11775053).
文摘For a more systematic understanding of the levels of environmental tritium and its behavior in East Asia,a database on environmental tritium was established based on the literature published in the past 30 years.Subsequently,the levels and behavior of the environmental tritium were further studied by statistical analyses.The results indicate that the distribution of environmental tritium is inhomogeneous and complex.In areas without nuclear facilities,the level of environmental tritium has decreased to its background level,even though a certain number of atmospheric nuclear tests were performed before 1980.In general,the level of atmospheric tritium was marginally higher than the levels in precipitation and surface water;the levels in shallow groundwater and seawater were considerably lower.Furthermore,the levels of tritium in the atmosphere,precipitation,and inland surface water were strongly correlated with latitude and distance from the coastline.In soil and living organisms,the level of tissue-free water tritium(TFWT)was comparable to the tritium levels in local rainfall,whereas the persistence of organically bound tritium(OBT)in the majority of organisms resulted in an OBT/TFWT ratio greater than one.Conversely,extremely high levels of environmental tritium were observed near certain nuclear power plants and the Fukushima accident sites.These results highlight the requirement to know the tritium baseline level and its behavior in the environment beforehand to better assess the impact of tritium discharge.Further investigations of environmental tritium in East Asia using more efficient and adequate monitoring methods are also required.
基金supported by the National Natural Science Foundation of China (Grant No.12075326)the Guangdong Basic and Applied Basic Research Foundation (Grant No.2025A1515010669)+2 种基金the Natural Science Foundation of Guangzhou (Grant No.2024A04J6243)the Fundamental Research Funds for the Central Universities in Sun Yat-sen University (No.23xkjc017)the Innovation Training Program for bachelor students in Sun Yat-sen University。
文摘In response to the capabilities presented by the High-Intensity Heavy Ion Accelerator Facility(HIAF) and the Accelerator-Driven Subcritical System(Ci ADS), as well as the proposed Chinese Advanced Nuclear Physics Research Facility(CNUF), we are assembling a consortium of experts in relevant disciplines, both domestically and internationally,to delineate high-precision physics experiments that leverage the state-of-the-art research environment afforded by CNUF.Our focus encompasses six primary domains of inquiry: hadron physics—including endeavors such as the super eta factory and investigations into light hadron structures;muon physics;neutrino physics;neutron physics;the testing of fundamental symmetries;and the exploration of quantum effects within nuclear physics, along with the utilization of vortex accelerators.We aim to foster a well-rounded portfolio of large, medium, and small-scale projects, thus unlocking new scientific avenues and optimizing the potential of the Huizhou large scientific facility. The aspiration for international leadership in scientific research will be a guiding principle in our strategic planning. This initiative will serve as a foundational reference for the Institute of Modern Physics in its strategic planning and goal-setting, ensuring alignment with its developmental objectives while striving to secure a competitive edge in technological advancement. Our ambition is to engage in substantive research within these realms of high-precision physics, to pursue groundbreaking discoveries, and to stimulate progress in China's nuclear physics landscape, positioning Huizhou as a preeminent global hub for advanced nuclear physics research.
文摘Just when world leaders thought that they could breathe easily after the successful Iran nuclear deal,nuclear security issues have been catapulted to the top of their agendas following North Korea’s recent testing of its nuclear bombs’capabilities.
