In March 2023,Indonesia took over the chairmanship of MIKTA from Turkiye,marking the second time Indonesia has served as the rotating chair of a global governance mechanism,following the Bali G20 Summit in 2022.
Torch bearers pass the flame during the torch relay of China's 14th National Winter Games in Hulun Buir,Inner Mongolia Autonomous Region,on February3.The games,which will take place in Hulun Buir from February 17 ...Torch bearers pass the flame during the torch relay of China's 14th National Winter Games in Hulun Buir,Inner Mongolia Autonomous Region,on February3.The games,which will take place in Hulun Buir from February 17 to 27,will be the largest ever of its kind,with more than 3,700 athletes participating.Originally scheduled to be held in 2020,the event was put on hold due to the COVID-19 pandemic.展开更多
Rendering translucent materials is costly:light transport algorithms need to simulate a large number of scattering events inside the material before reaching convergence.The cost is especially high for materials with ...Rendering translucent materials is costly:light transport algorithms need to simulate a large number of scattering events inside the material before reaching convergence.The cost is especially high for materials with a large albedo or a small mean-freepath,where higher-order scattering effects dominate.In simple terms,the paths get lost in the medium.Path guiding has been proposed for surface rendering to make convergence faster by guiding the sampling process.In this paper,we introduce a path guiding solution for translucent materials.We learn an adaptive approximate representation of the radiance distribution in the volume and use it to sample the scattering direction,combining it with phase function sampling by resampled importance sampling.The proposed method significantly improves the performance of light transport simulation in participating media,especially for small lights and media with refractive boundaries.Our method can handle any homogeneous participating medium,with high or low scattering,with high or low absorption,and from isotropic to highly anisotropic.展开更多
Over the past decade,the Belt and Road Initiative has gradually radiated from a few in the know to the broader international community,and now participating countries are working together to transform the beautiful vi...Over the past decade,the Belt and Road Initiative has gradually radiated from a few in the know to the broader international community,and now participating countries are working together to transform the beautiful vision into practical results.展开更多
China hosted the historic first China-Central Asia Summit,on May 18 and 19 in Xi'an,I china's_ancient capital at the eastern end of the Silk Road.This landmark event,stemming from the China+Central Asia(C+C5)c...China hosted the historic first China-Central Asia Summit,on May 18 and 19 in Xi'an,I china's_ancient capital at the eastern end of the Silk Road.This landmark event,stemming from the China+Central Asia(C+C5)cooperation mechanism initiated in 2020,brought together leaders from the six participating countries for their first face-to-face collective meeting.展开更多
From November 5 to 10,the sixth China International Import Expo(CIIE),themed“New Era,Shared Future,”took place in Shanghai.It was the first fully offline edition of CIIE since the COVID-19 pandemic.This year,69 coun...From November 5 to 10,the sixth China International Import Expo(CIIE),themed“New Era,Shared Future,”took place in Shanghai.It was the first fully offline edition of CIIE since the COVID-19 pandemic.This year,69 countries and three international organizations participated in the Country Exhibition,with 11 countries participating for the first time and 34 countries participating offline for the first time.Sheng Qiuping,Chinese vice minister of commerce,said at a news conference that the sixth CIIE would cover over 367,000 square meters and feature participation from a record 289 Fortune Global 500 companies and industry-leading businesses.展开更多
The boundary emissivity, thermal conductivity, and boundary time-varying heat flux in the participating media are retrieved in this work. In the forward model, the coupled radiation-conduction heat transfer in the par...The boundary emissivity, thermal conductivity, and boundary time-varying heat flux in the participating media are retrieved in this work. In the forward model, the coupled radiation-conduction heat transfer in the participating medium is resolved by the finite volume method combined with discrete ordinates method. The inverse model utilizes the temperature signals at the appropriate position of the medium as the known information and uses the unscented Kalman filter(UKF) as an optimization tool to reconstruct the boundary emissivity, thermal conductivity, and boundary time-varying heat flux. It is found that when the emissivity, thermal conductivity, and boundary time-varying heat flux are reconstructed simultaneously, only the temperature information of two locations is required. The influence of the measurement noise, sampling interval, absorption coefficient,process noise covariance, measurement noise covariance on the accuracy and stability of the retrieval results is investigated in detail. All the reconstruction results indicate that the UKF technique is effective and robust for estimating the photothermal parameters and boundary condition of the radiation-conduction heat transfer problems.展开更多
The knowledge of transient temperature of the ladle wall is a key factor in optimizing energy consumption in steelmaking process.The transient temperature needs to be estimated.A nonlinear lumped parameter model was u...The knowledge of transient temperature of the ladle wall is a key factor in optimizing energy consumption in steelmaking process.The transient temperature needs to be estimated.A nonlinear lumped parameter model was used to model the thermal dynamics of the ladle.Then,the bounded Jacobian nonlinear observer was utilized to estimate the temperature.With this method,the estimation model became a closed-loop model and the observer gains were obtained by solving linear matrix inequalities and simply implemented to the system.Comparison between the simulation and recorded data at a participating steel plant in Thailand showed that the nonlinear observer accurately estimated the temperature of the ladle lining.This estimated temperature was very useful in determining suitable tapping temperature for energy conservation and steel quality.展开更多
文摘In March 2023,Indonesia took over the chairmanship of MIKTA from Turkiye,marking the second time Indonesia has served as the rotating chair of a global governance mechanism,following the Bali G20 Summit in 2022.
文摘Torch bearers pass the flame during the torch relay of China's 14th National Winter Games in Hulun Buir,Inner Mongolia Autonomous Region,on February3.The games,which will take place in Hulun Buir from February 17 to 27,will be the largest ever of its kind,with more than 3,700 athletes participating.Originally scheduled to be held in 2020,the event was put on hold due to the COVID-19 pandemic.
基金partially supported by the NationalKey R&D Program of China under Grant No.2017YFB0203000the National Natural Science Foundation of China under Grant Nos.61802187 and 61872223+2 种基金the Natural Science Foundation of Jiangsu under Grant No.BK20170857the fundamental research funds for the central universities No.30918011320ANR project ANR-15-CE380005“Materials”.
文摘Rendering translucent materials is costly:light transport algorithms need to simulate a large number of scattering events inside the material before reaching convergence.The cost is especially high for materials with a large albedo or a small mean-freepath,where higher-order scattering effects dominate.In simple terms,the paths get lost in the medium.Path guiding has been proposed for surface rendering to make convergence faster by guiding the sampling process.In this paper,we introduce a path guiding solution for translucent materials.We learn an adaptive approximate representation of the radiance distribution in the volume and use it to sample the scattering direction,combining it with phase function sampling by resampled importance sampling.The proposed method significantly improves the performance of light transport simulation in participating media,especially for small lights and media with refractive boundaries.Our method can handle any homogeneous participating medium,with high or low scattering,with high or low absorption,and from isotropic to highly anisotropic.
文摘Over the past decade,the Belt and Road Initiative has gradually radiated from a few in the know to the broader international community,and now participating countries are working together to transform the beautiful vision into practical results.
文摘China hosted the historic first China-Central Asia Summit,on May 18 and 19 in Xi'an,I china's_ancient capital at the eastern end of the Silk Road.This landmark event,stemming from the China+Central Asia(C+C5)cooperation mechanism initiated in 2020,brought together leaders from the six participating countries for their first face-to-face collective meeting.
文摘From November 5 to 10,the sixth China International Import Expo(CIIE),themed“New Era,Shared Future,”took place in Shanghai.It was the first fully offline edition of CIIE since the COVID-19 pandemic.This year,69 countries and three international organizations participated in the Country Exhibition,with 11 countries participating for the first time and 34 countries participating offline for the first time.Sheng Qiuping,Chinese vice minister of commerce,said at a news conference that the sixth CIIE would cover over 367,000 square meters and feature participation from a record 289 Fortune Global 500 companies and industry-leading businesses.
基金supported by the National Natural Science Foundation of China(Grant Nos.51976044 and 51806047)
文摘The boundary emissivity, thermal conductivity, and boundary time-varying heat flux in the participating media are retrieved in this work. In the forward model, the coupled radiation-conduction heat transfer in the participating medium is resolved by the finite volume method combined with discrete ordinates method. The inverse model utilizes the temperature signals at the appropriate position of the medium as the known information and uses the unscented Kalman filter(UKF) as an optimization tool to reconstruct the boundary emissivity, thermal conductivity, and boundary time-varying heat flux. It is found that when the emissivity, thermal conductivity, and boundary time-varying heat flux are reconstructed simultaneously, only the temperature information of two locations is required. The influence of the measurement noise, sampling interval, absorption coefficient,process noise covariance, measurement noise covariance on the accuracy and stability of the retrieval results is investigated in detail. All the reconstruction results indicate that the UKF technique is effective and robust for estimating the photothermal parameters and boundary condition of the radiation-conduction heat transfer problems.
基金Item Sponsored by Ratchadaphiseksomphot Endowment Fund Part of Research Grant for New Scholar CU Researcher's Project of Thailand(RGN_2559_022_03_21)
文摘The knowledge of transient temperature of the ladle wall is a key factor in optimizing energy consumption in steelmaking process.The transient temperature needs to be estimated.A nonlinear lumped parameter model was used to model the thermal dynamics of the ladle.Then,the bounded Jacobian nonlinear observer was utilized to estimate the temperature.With this method,the estimation model became a closed-loop model and the observer gains were obtained by solving linear matrix inequalities and simply implemented to the system.Comparison between the simulation and recorded data at a participating steel plant in Thailand showed that the nonlinear observer accurately estimated the temperature of the ladle lining.This estimated temperature was very useful in determining suitable tapping temperature for energy conservation and steel quality.
