January 29,Brussels,Belgium The 3rd meeting of the High-Level Forum on Standardization will take place on January 29,2025 in the Berlaymont building.The Executive Vice-President Stéphane Séjournéwill pe...January 29,Brussels,Belgium The 3rd meeting of the High-Level Forum on Standardization will take place on January 29,2025 in the Berlaymont building.The Executive Vice-President Stéphane Séjournéwill personally chair the meeting that will gather high-level representatives of Member States and relevant stakeholders in standardization.展开更多
On December 2-3,the China Center for SCO Studies and the China National Institute for SCO International Exchange and Judicial Cooperation jointly organized the first SCO High-Level Forum in Shanghai under the theme of...On December 2-3,the China Center for SCO Studies and the China National Institute for SCO International Exchange and Judicial Cooperation jointly organized the first SCO High-Level Forum in Shanghai under the theme of“Challenges and Opportunities for the SCO under COVID-19.”展开更多
On December 3, the Shanghai Cooperation Organization(SCO) HighLevel Forum 2022 was held online. Co-hosted by CIIS, China Center for SCO Studies, Shanghai University of Political Science and Law(SHUPL), and China-SCO I...On December 3, the Shanghai Cooperation Organization(SCO) HighLevel Forum 2022 was held online. Co-hosted by CIIS, China Center for SCO Studies, Shanghai University of Political Science and Law(SHUPL), and China-SCO International Judicial Exchange and Cooperation Training Base.展开更多
Asia-Pacific Space Cooperation Organization’s(APSCO)10th anniversary High-Level Forum was held in Beijing on November 14,2018.Representatives from 24 countries and more than 100 representatives from the United Nation...Asia-Pacific Space Cooperation Organization’s(APSCO)10th anniversary High-Level Forum was held in Beijing on November 14,2018.Representatives from 24 countries and more than 100 representatives from the United Nations and relevant international organizations attended the forum.President XI Jinping sent a congratulatory letter to APSCO on its 10th anniversary.展开更多
The UN World Summit on the Information Society(WSIS)+20 Forum High-Level Event 2024 will take place from May 27-31,2024 in Geneva,Switzerland in parallel with the AI Global Summit,with options for remote participation...The UN World Summit on the Information Society(WSIS)+20 Forum High-Level Event 2024 will take place from May 27-31,2024 in Geneva,Switzerland in parallel with the AI Global Summit,with options for remote participation.During the open event,a series of workshops(Partner Insights),high-level policy sessions(Leaders TalkX)and special tracks will be held on various thematic areas addressing issues that are important in helping to achieve the UN Sustainable Development Goals(SDGs).展开更多
Themed Work Together for New Development and Modernisation:Pooling People's Strength to Build a High-Level China-Africa Community with a Shared Future,the Seventh China-Africa People's Forum&the Seventh Ch...Themed Work Together for New Development and Modernisation:Pooling People's Strength to Build a High-Level China-Africa Community with a Shared Future,the Seventh China-Africa People's Forum&the Seventh China-Africa Young Leaders Forum was held in Hunan from 24th to 26th of July.展开更多
The Implementation Plan of Selection and Building of Pilot Colleges for SOP (Standard Operating Procedure) Standardization Talent Cultivation was released at the 3rd Education Standardization Development Forum on Dece...The Implementation Plan of Selection and Building of Pilot Colleges for SOP (Standard Operating Procedure) Standardization Talent Cultivation was released at the 3rd Education Standardization Development Forum on December 28, 2024, marking the establishment of service system for the pilot of integrated education of profession and standardization.展开更多
IFCE International Forum for Clean Energy(Macao)Research Think Tank Technological Innovation Investment Collaboration Market Development Established in 2012,the International Forum for Clean Energy(Macao)(IFCE)is a le...IFCE International Forum for Clean Energy(Macao)Research Think Tank Technological Innovation Investment Collaboration Market Development Established in 2012,the International Forum for Clean Energy(Macao)(IFCE)is a leading global platform committed to advancing clean energy solutions.展开更多
With the rapid development of artificial intelligence technology,AIGC(Artificial Intelligence-Generated Content)has triggered profound changes in the field of high-level language programming courses.This paper deeply ...With the rapid development of artificial intelligence technology,AIGC(Artificial Intelligence-Generated Content)has triggered profound changes in the field of high-level language programming courses.This paper deeply explored the application principles,advantages,and limitations of AIGC in intelligent code generation,analyzed the new mode of human-computer collaboration in high-level language programming courses driven by AIGC,discussed the impact of human-computer collaboration on programming efficiency and code quality through practical case studies,and looks forward to future development trends.This research aims to provide theoretical and practical guidance for high-level language programming courses and promote innovative development of high-level language programming courses under the human-computer collaboration paradigm.展开更多
In the current era marked by energy shortages,the advancement of nuclear energy stands as an inevitable progression.The reprocessing of spent nuclear fuel plays a crucial role in determining the sustainability of nucl...In the current era marked by energy shortages,the advancement of nuclear energy stands as an inevitable progression.The reprocessing of spent nuclear fuel plays a crucial role in determining the sustainability of nuclear energy as a viable energy source.Among these processes,the separation and recovery of Pu(Ⅳ)from high-level liquid waste(HLLW)hold paramount significance in terms of safety and strategic implications.Herein,this work focused on the synthesis of two acid-and radiation-resistant pyridine-based sp^(2)c-COFs(COF-IHEP3 and COF-IHEP4),followed by the creation of two pyridine-based ionized sp^(2)c-COFs named COF-IHEP3-CH_(3)NO_(3)and COF-IHEP4-CH3NO3through post-modification.These materials have potential anion exchange capacity for the selective separation of Pu(Ⅳ)in highly acidic conditions.Notably,in 8 mol/L nitric acid solution,COF-IHEP3-CH3NO3demonstrated the capability to eliminate plutonium within 20 min in 98%removal efficiency with a Kdvalue of 2450 m L/g.Experimental and theoretical analysis suggest that the ionized sp^(2)c-COFs exhibit exceptional stability,selectivity,and prevention of secondary contamination towards Pu(Ⅳ)in the presence of multiple ions environments.In short,this work provides an appropriate anion exchange strategy to design ionic sp^(2)c-COFs as a promising platform for Pu(Ⅳ)recovery from HLLW.展开更多
Chinese Premier Li Qiang on March 23 pledged to unswervingly advance opening up and cooperation amid rising global instability and uncertainty.Li made the remarks in a keynote speech at the opening ceremony of the Chi...Chinese Premier Li Qiang on March 23 pledged to unswervingly advance opening up and cooperation amid rising global instability and uncertainty.Li made the remarks in a keynote speech at the opening ceremony of the China Development Forum 2025 in Beijing.China will continue to welcome enterprises from around the world with open arms,further expand market access,actively address the concerns of businesses,and facilitate deeper integration of foreign-funded enterprises into the Chinese market,he said.展开更多
The third plenary session of the 20th Central Committee of the Communist Party of China further emphasized the importance of national security by specifying arrangements for modernizing China's national security s...The third plenary session of the 20th Central Committee of the Communist Party of China further emphasized the importance of national security by specifying arrangements for modernizing China's national security system and capacity.It stressed the need to“ensure that high-quality development and greater security reinforce each other,”fully demonstrating China's commitment to and reflecting the natural requirement of balancing development and security on the new journey.To achieve this,China should coordinate the following four aspects.First,domestic and international imperatives.China should steadily advance its national rejuvenation based on an accurate understanding of the once-in-a-century changes taking place in the world,leading global trends with its governance.Second,China's new development pattern and new security architecture.China should accelerate the creation of a new security architecture that aligns with and safeguards its new development pattern.Third,new quality productive forces and new quality national security capabilities.To achieve high-quality development and high-level security,China must ensure that its new quality productive forces and new quality national security capabilities effectively integrate with and boost each other.Fourth,Chinese modernization and the path of national security capabilities.To achieve high-quality development and high-level security,China must ensure that its new quality productive forces and new quality national security capabilities effectively integrate with and boost each other.Fourth,Chinese modernization and the path of national security with Chinese characteristics.China should accurately grasp the defining features of its modernization and the path of national security with Chinese characteristics,safeguarding Chinese modernization by modernizing its national security system and capacity.展开更多
With the widespread application of large language models(LLMs)in natural language processing and code generation,traditional High-Level Language Programming courses are facing unprecedented challenges and opportunitie...With the widespread application of large language models(LLMs)in natural language processing and code generation,traditional High-Level Language Programming courses are facing unprecedented challenges and opportunities.As a core programming language for computer science majors,C language remains irreplaceable due to its foundational nature and engineering adaptability.This paper,based on the rapid development of large model technologies,proposes a systematic reform design for C language teaching,focusing on teaching objectives,content structure,teaching methods,and evaluation systems.The article suggests a teaching framework centered on“human-computer collaborative programming,”integrating prompt training,AI-assisted debugging,and code generation analysis,aiming to enhance students’problem modeling ability,programming expression skills,and AI collaboration literacy.展开更多
The 2025 International Standardization(Chilin)Forum was held in Nanjing city,East China’s Jiangsu province,on April 16 with the theme of“Towards carbon peak and carbon neutrality:international carbon footprint stand...The 2025 International Standardization(Chilin)Forum was held in Nanjing city,East China’s Jiangsu province,on April 16 with the theme of“Towards carbon peak and carbon neutrality:international carbon footprint standards driving green and low-carbon development”.展开更多
As a major principle underlying the Communist Party of China's(CPC)governance in the new era and a core piece of its holistic approach to national security,ensuring both development and security emphasizes compreh...As a major principle underlying the Communist Party of China's(CPC)governance in the new era and a core piece of its holistic approach to national security,ensuring both development and security emphasizes comprehensive governance from a long-term perspective and influences the world with its global vision.It keeps pace with the times by prioritizing innovative areas and is of great theoretical and practical significance.On the new journey ahead,we must firmly ensure both development and security.More importantly,we must ensure both high-quality development and high-level security,safeguarding the former through the latter.This is an urgent requirement we face in today's world,which has entered a period of turbulence and transformation characterized by increasing complexity.Confronted with the formidable tasks of promoting reform and development while maintaining stability at home and the grave challenges brought about by international turbulence and changes,we must earnestly implement the guiding principles of the 20th CPC National Congress and the third plenary session of the 20th Party Central Committee.We should ensure secure and sustainable development,accelerate efforts to modernize China's national security system and capacity,foster high-level security,and improve the mechanisms for preserving national security in foreign-related affairs.In short,we should strive to achieve a positive interplay between high-quality development and high-level security,so as to effectively safeguard Chinese modernization.展开更多
From 25 November to 4 December 2024,at the invitation of the United Nations Alliance of Civilisations,Europe-China Returnee Alliance,and the“Polish House”Civil Association,Zhu Rui,CAFIU counselor and former Assistan...From 25 November to 4 December 2024,at the invitation of the United Nations Alliance of Civilisations,Europe-China Returnee Alliance,and the“Polish House”Civil Association,Zhu Rui,CAFIU counselor and former Assistant Minister of IDCPC,led a CAFIU working group to Portugal to attend the 1Oth Global Forum of the United Nations Alliance of Civilisations.展开更多
On July 26,the International Forum on Standardization of Artificial Intelligence was held in Shanghai Expo Center.Guided by the WAIC organizing committee,the forum was hosted by the AIM Global Centre of Excellence(AIM...On July 26,the International Forum on Standardization of Artificial Intelligence was held in Shanghai Expo Center.Guided by the WAIC organizing committee,the forum was hosted by the AIM Global Centre of Excellence(AIM Global CoE),and jointly organized by China Electronics Standardization Institute(CESI),Shanghai Artificial Intelligence Research Institute(SAIRI),and Bank of China Shanghai Branch.Aimed at building a high-end AI dialogue platform for the world to promote international exchange and cooperation,the forum attracted more than 200 vips and representatives from international organizations,governmental departments,universities,research institutes,and industrial leading companies.They held in-depth discussions on topics of technical standards,ethics and governance,and global coordination,and strove to form an AI standardization framework with global consensus.展开更多
During daylight laser polarization sensing of high-level clouds(HLCs),the lidar receiving system generates a signal caused by not only backscattered laser radiation,but also scattered solar radiation,the intensity and...During daylight laser polarization sensing of high-level clouds(HLCs),the lidar receiving system generates a signal caused by not only backscattered laser radiation,but also scattered solar radiation,the intensity and polarization of which depends on the Sun’s location.If a cloud contains spatially oriented ice particles,then it becomes anisotropic,that is,the coefficients of directional light scattering of such a cloud depend on the Sun’s zenith and azimuth angles.In this work,the possibility of using the effect of anisotropic scattering of solar radiation on the predictive ability of machine learning algorithms in solving the problem of predicting the HLC backscattering phase matrix(BSPM)was evaluated.The hypothesis that solar radiation scattered on HLCs has no effect on the BSPM elements of such clouds determined with a polarization lidar was tested.The operation of two algorithms for predicting the BSPM elements is evaluated.To train the first one,meteorological data were used as input parameters;for the second algorithm,the azi-muthal and zenith angles of the Sun’s position were added to the meteorological parameters.It is shown that there is no significant improvement in the predictive ability of the algorithm.展开更多
On June 20,the 7th China-Latin America and Caribbean Think Tank Forum was held in Beijing.The forum carried the theme“Working Together to Build a China-LAC Community with a Shared Future.”Assistant Foreign Minister ...On June 20,the 7th China-Latin America and Caribbean Think Tank Forum was held in Beijing.The forum carried the theme“Working Together to Build a China-LAC Community with a Shared Future.”Assistant Foreign Minister Miao Deyu attended the opening ceremony and delivered remarks.Leonel Caraballo Maqueira,Vice President of the Cuban Diplomatic Academy,and Martin Charles,Ambassador of Dominica to China and Representative of the Latin American and Caribbean Diplomatic Corps in China,attended the meeting and delivered speeches.展开更多
Deep metal mines are often mined using the high-level pillars with subsequent cementation backfilling(HLSCB)mining method.At the design stage,it is therefore important to have a reasonable method for determining the s...Deep metal mines are often mined using the high-level pillars with subsequent cementation backfilling(HLSCB)mining method.At the design stage,it is therefore important to have a reasonable method for determining the shear strength of the high-level pillars(i.e.cohesion and internal friction angle)when they are supported by cemented backfilling.In this study,a formula was derived for the upper limit of the confining pressure σ3max on a high-level pillar supported by cemented backfilling in a deep metal mine.A new method of estimating the shear strength of such pillars was then proposed based on the Hoek eBrown failure criterion.Our analysis indicates that the horizontal stress σhh acting on the cemented backfill pillar can be simplified by expressing it as a constant value.A reasonable and effective value for σ3max can then be determined.The value of s3max predicted using the proposed method is generally less than 3 MPa.Within this range,the shear strength of the high-level pillar is accurately calculated using the equivalent MohreCoulomb theory.The proposed method can effectively avoid the calculation of inaccurate shear strength values for the high-level pillars when the original HoekeBrown criterion is used in the presence of large confining pressures,i.e.the situation in which the cohesion value is too large and the friction angle is too small can effectively be avoided.The proposed method is applied to a deep metal mine in China that is being excavated using the HLSCB method.The shear strength parameters of the high-level pillars obtained using the proposed method were input in the numerical simulations.The numerical results show that the recommended level heights and sizes of the high-level pillars and rooms in the mine are rational.展开更多
文摘January 29,Brussels,Belgium The 3rd meeting of the High-Level Forum on Standardization will take place on January 29,2025 in the Berlaymont building.The Executive Vice-President Stéphane Séjournéwill personally chair the meeting that will gather high-level representatives of Member States and relevant stakeholders in standardization.
文摘On December 2-3,the China Center for SCO Studies and the China National Institute for SCO International Exchange and Judicial Cooperation jointly organized the first SCO High-Level Forum in Shanghai under the theme of“Challenges and Opportunities for the SCO under COVID-19.”
文摘On December 3, the Shanghai Cooperation Organization(SCO) HighLevel Forum 2022 was held online. Co-hosted by CIIS, China Center for SCO Studies, Shanghai University of Political Science and Law(SHUPL), and China-SCO International Judicial Exchange and Cooperation Training Base.
文摘Asia-Pacific Space Cooperation Organization’s(APSCO)10th anniversary High-Level Forum was held in Beijing on November 14,2018.Representatives from 24 countries and more than 100 representatives from the United Nations and relevant international organizations attended the forum.President XI Jinping sent a congratulatory letter to APSCO on its 10th anniversary.
文摘The UN World Summit on the Information Society(WSIS)+20 Forum High-Level Event 2024 will take place from May 27-31,2024 in Geneva,Switzerland in parallel with the AI Global Summit,with options for remote participation.During the open event,a series of workshops(Partner Insights),high-level policy sessions(Leaders TalkX)and special tracks will be held on various thematic areas addressing issues that are important in helping to achieve the UN Sustainable Development Goals(SDGs).
文摘Themed Work Together for New Development and Modernisation:Pooling People's Strength to Build a High-Level China-Africa Community with a Shared Future,the Seventh China-Africa People's Forum&the Seventh China-Africa Young Leaders Forum was held in Hunan from 24th to 26th of July.
文摘The Implementation Plan of Selection and Building of Pilot Colleges for SOP (Standard Operating Procedure) Standardization Talent Cultivation was released at the 3rd Education Standardization Development Forum on December 28, 2024, marking the establishment of service system for the pilot of integrated education of profession and standardization.
文摘IFCE International Forum for Clean Energy(Macao)Research Think Tank Technological Innovation Investment Collaboration Market Development Established in 2012,the International Forum for Clean Energy(Macao)(IFCE)is a leading global platform committed to advancing clean energy solutions.
基金Education and Teaching Research Project of Beijing University of Technology(ER2024KCB08)。
文摘With the rapid development of artificial intelligence technology,AIGC(Artificial Intelligence-Generated Content)has triggered profound changes in the field of high-level language programming courses.This paper deeply explored the application principles,advantages,and limitations of AIGC in intelligent code generation,analyzed the new mode of human-computer collaboration in high-level language programming courses driven by AIGC,discussed the impact of human-computer collaboration on programming efficiency and code quality through practical case studies,and looks forward to future development trends.This research aims to provide theoretical and practical guidance for high-level language programming courses and promote innovative development of high-level language programming courses under the human-computer collaboration paradigm.
基金supported by the National Natural Science Foundation of China(Nos.U2067212,22176191)the National Science Fund for Distinguished Young Scholars(No.21925603)。
文摘In the current era marked by energy shortages,the advancement of nuclear energy stands as an inevitable progression.The reprocessing of spent nuclear fuel plays a crucial role in determining the sustainability of nuclear energy as a viable energy source.Among these processes,the separation and recovery of Pu(Ⅳ)from high-level liquid waste(HLLW)hold paramount significance in terms of safety and strategic implications.Herein,this work focused on the synthesis of two acid-and radiation-resistant pyridine-based sp^(2)c-COFs(COF-IHEP3 and COF-IHEP4),followed by the creation of two pyridine-based ionized sp^(2)c-COFs named COF-IHEP3-CH_(3)NO_(3)and COF-IHEP4-CH3NO3through post-modification.These materials have potential anion exchange capacity for the selective separation of Pu(Ⅳ)in highly acidic conditions.Notably,in 8 mol/L nitric acid solution,COF-IHEP3-CH3NO3demonstrated the capability to eliminate plutonium within 20 min in 98%removal efficiency with a Kdvalue of 2450 m L/g.Experimental and theoretical analysis suggest that the ionized sp^(2)c-COFs exhibit exceptional stability,selectivity,and prevention of secondary contamination towards Pu(Ⅳ)in the presence of multiple ions environments.In short,this work provides an appropriate anion exchange strategy to design ionic sp^(2)c-COFs as a promising platform for Pu(Ⅳ)recovery from HLLW.
文摘Chinese Premier Li Qiang on March 23 pledged to unswervingly advance opening up and cooperation amid rising global instability and uncertainty.Li made the remarks in a keynote speech at the opening ceremony of the China Development Forum 2025 in Beijing.China will continue to welcome enterprises from around the world with open arms,further expand market access,actively address the concerns of businesses,and facilitate deeper integration of foreign-funded enterprises into the Chinese market,he said.
文摘The third plenary session of the 20th Central Committee of the Communist Party of China further emphasized the importance of national security by specifying arrangements for modernizing China's national security system and capacity.It stressed the need to“ensure that high-quality development and greater security reinforce each other,”fully demonstrating China's commitment to and reflecting the natural requirement of balancing development and security on the new journey.To achieve this,China should coordinate the following four aspects.First,domestic and international imperatives.China should steadily advance its national rejuvenation based on an accurate understanding of the once-in-a-century changes taking place in the world,leading global trends with its governance.Second,China's new development pattern and new security architecture.China should accelerate the creation of a new security architecture that aligns with and safeguards its new development pattern.Third,new quality productive forces and new quality national security capabilities.To achieve high-quality development and high-level security,China must ensure that its new quality productive forces and new quality national security capabilities effectively integrate with and boost each other.Fourth,Chinese modernization and the path of national security capabilities.To achieve high-quality development and high-level security,China must ensure that its new quality productive forces and new quality national security capabilities effectively integrate with and boost each other.Fourth,Chinese modernization and the path of national security with Chinese characteristics.China should accurately grasp the defining features of its modernization and the path of national security with Chinese characteristics,safeguarding Chinese modernization by modernizing its national security system and capacity.
基金Education and Teaching Research Project of Beijing University of Technology(ER2024KCB08)。
文摘With the widespread application of large language models(LLMs)in natural language processing and code generation,traditional High-Level Language Programming courses are facing unprecedented challenges and opportunities.As a core programming language for computer science majors,C language remains irreplaceable due to its foundational nature and engineering adaptability.This paper,based on the rapid development of large model technologies,proposes a systematic reform design for C language teaching,focusing on teaching objectives,content structure,teaching methods,and evaluation systems.The article suggests a teaching framework centered on“human-computer collaborative programming,”integrating prompt training,AI-assisted debugging,and code generation analysis,aiming to enhance students’problem modeling ability,programming expression skills,and AI collaboration literacy.
文摘The 2025 International Standardization(Chilin)Forum was held in Nanjing city,East China’s Jiangsu province,on April 16 with the theme of“Towards carbon peak and carbon neutrality:international carbon footprint standards driving green and low-carbon development”.
文摘As a major principle underlying the Communist Party of China's(CPC)governance in the new era and a core piece of its holistic approach to national security,ensuring both development and security emphasizes comprehensive governance from a long-term perspective and influences the world with its global vision.It keeps pace with the times by prioritizing innovative areas and is of great theoretical and practical significance.On the new journey ahead,we must firmly ensure both development and security.More importantly,we must ensure both high-quality development and high-level security,safeguarding the former through the latter.This is an urgent requirement we face in today's world,which has entered a period of turbulence and transformation characterized by increasing complexity.Confronted with the formidable tasks of promoting reform and development while maintaining stability at home and the grave challenges brought about by international turbulence and changes,we must earnestly implement the guiding principles of the 20th CPC National Congress and the third plenary session of the 20th Party Central Committee.We should ensure secure and sustainable development,accelerate efforts to modernize China's national security system and capacity,foster high-level security,and improve the mechanisms for preserving national security in foreign-related affairs.In short,we should strive to achieve a positive interplay between high-quality development and high-level security,so as to effectively safeguard Chinese modernization.
文摘From 25 November to 4 December 2024,at the invitation of the United Nations Alliance of Civilisations,Europe-China Returnee Alliance,and the“Polish House”Civil Association,Zhu Rui,CAFIU counselor and former Assistant Minister of IDCPC,led a CAFIU working group to Portugal to attend the 1Oth Global Forum of the United Nations Alliance of Civilisations.
文摘On July 26,the International Forum on Standardization of Artificial Intelligence was held in Shanghai Expo Center.Guided by the WAIC organizing committee,the forum was hosted by the AIM Global Centre of Excellence(AIM Global CoE),and jointly organized by China Electronics Standardization Institute(CESI),Shanghai Artificial Intelligence Research Institute(SAIRI),and Bank of China Shanghai Branch.Aimed at building a high-end AI dialogue platform for the world to promote international exchange and cooperation,the forum attracted more than 200 vips and representatives from international organizations,governmental departments,universities,research institutes,and industrial leading companies.They held in-depth discussions on topics of technical standards,ethics and governance,and global coordination,and strove to form an AI standardization framework with global consensus.
基金supported by the Government of the Russian Federation grant number 075-15-2025-009 of 28 February 2025 and by the Russian Science Foundation,Grant No.24-72-10127.
文摘During daylight laser polarization sensing of high-level clouds(HLCs),the lidar receiving system generates a signal caused by not only backscattered laser radiation,but also scattered solar radiation,the intensity and polarization of which depends on the Sun’s location.If a cloud contains spatially oriented ice particles,then it becomes anisotropic,that is,the coefficients of directional light scattering of such a cloud depend on the Sun’s zenith and azimuth angles.In this work,the possibility of using the effect of anisotropic scattering of solar radiation on the predictive ability of machine learning algorithms in solving the problem of predicting the HLC backscattering phase matrix(BSPM)was evaluated.The hypothesis that solar radiation scattered on HLCs has no effect on the BSPM elements of such clouds determined with a polarization lidar was tested.The operation of two algorithms for predicting the BSPM elements is evaluated.To train the first one,meteorological data were used as input parameters;for the second algorithm,the azi-muthal and zenith angles of the Sun’s position were added to the meteorological parameters.It is shown that there is no significant improvement in the predictive ability of the algorithm.
文摘On June 20,the 7th China-Latin America and Caribbean Think Tank Forum was held in Beijing.The forum carried the theme“Working Together to Build a China-LAC Community with a Shared Future.”Assistant Foreign Minister Miao Deyu attended the opening ceremony and delivered remarks.Leonel Caraballo Maqueira,Vice President of the Cuban Diplomatic Academy,and Martin Charles,Ambassador of Dominica to China and Representative of the Latin American and Caribbean Diplomatic Corps in China,attended the meeting and delivered speeches.
基金Financial support for this work was provided by the General Program and Youth Fund Program of the National Natural Science Foundation of China(Grant Nos.42377175 and 42002292).
文摘Deep metal mines are often mined using the high-level pillars with subsequent cementation backfilling(HLSCB)mining method.At the design stage,it is therefore important to have a reasonable method for determining the shear strength of the high-level pillars(i.e.cohesion and internal friction angle)when they are supported by cemented backfilling.In this study,a formula was derived for the upper limit of the confining pressure σ3max on a high-level pillar supported by cemented backfilling in a deep metal mine.A new method of estimating the shear strength of such pillars was then proposed based on the Hoek eBrown failure criterion.Our analysis indicates that the horizontal stress σhh acting on the cemented backfill pillar can be simplified by expressing it as a constant value.A reasonable and effective value for σ3max can then be determined.The value of s3max predicted using the proposed method is generally less than 3 MPa.Within this range,the shear strength of the high-level pillar is accurately calculated using the equivalent MohreCoulomb theory.The proposed method can effectively avoid the calculation of inaccurate shear strength values for the high-level pillars when the original HoekeBrown criterion is used in the presence of large confining pressures,i.e.the situation in which the cohesion value is too large and the friction angle is too small can effectively be avoided.The proposed method is applied to a deep metal mine in China that is being excavated using the HLSCB method.The shear strength parameters of the high-level pillars obtained using the proposed method were input in the numerical simulations.The numerical results show that the recommended level heights and sizes of the high-level pillars and rooms in the mine are rational.
