By using a linear baroclinic model(LBM),this study investigates the different Rossby wave train(RWT)patterns associated with the Tibetan Plateau(TP)upper-atmospheric heat source(TPUHS)that is anomalously shallower and...By using a linear baroclinic model(LBM),this study investigates the different Rossby wave train(RWT)patterns associated with the Tibetan Plateau(TP)upper-atmospheric heat source(TPUHS)that is anomalously shallower and deeper in boreal summer.Observational results indicate the different RWT patterns between the developing and decaying periods of synoptic TPUHS events,when the anomalous TPUHS develops from a relatively shallower to a deeper TP heat source.Based on the different vertical heating profiles between these two periods in observation,this study forces the LBM with prescribed TPUHS profiles to mimic a shallower and deeper summer TP heat source.The results show that the atmospheric responses to a shallower and deeper TPUHS do exhibit different RWT patterns that largely resemble those in observation.Namely,corresponding RWT pattern to a shallower TPUHS stretches from the TP to the west coast of America,while that to a deeper TPUHS extends from the TP region to Alaska.展开更多
This paper addresses the problems faced in programmable logic controller(PLC)teaching in vocational colleges and proposes countermeasures to overcome these challenges.The study emphasizes the need for a deeper underst...This paper addresses the problems faced in programmable logic controller(PLC)teaching in vocational colleges and proposes countermeasures to overcome these challenges.The study emphasizes the need for a deeper understanding of fundamental concepts and the integration of practical application in PLC education.It suggests involving students in teacher-led projects to enhance their programming skills and problem-solving skills.Additionally,the paper highlights the importance of interactive learning and collaborative discussions to foster student engagement.Furthermore,it emphasizes the cultivation of innovation consciousness through participation in innovation competitions and projects.The implementation of these strategies has shown positive results in improving learning outcomes and preparing students for careers in automation and control.This research contributes to the development of effective teaching approaches in PLC education in vocational colleges.展开更多
Ultra-deep clastic reservoirs generally have poor physical properties and low single-well productivity,but Well BZ9,which is newly drilled in the Kuqa Depression of Tarim Basin,NW China,encounters a thick high-quality...Ultra-deep clastic reservoirs generally have poor physical properties and low single-well productivity,but Well BZ9,which is newly drilled in the Kuqa Depression of Tarim Basin,NW China,encounters a thick high-quality reservoir in the Bashijiqike Formation of Lower Cretaceous deeper than 7600 m and produces a high-yield industrial gas flow.In order to reveal the characteristics and genesis of the Bashijiqike Formation reservoir and reduce the exploration risk of ultra-deep oil and gas layers,we discussed its characteristics,genetic mechanism and oil&gas exploration significance based on cores,well logging and experimental analysis,combined with regional temperatureepressure conditions and burial evolution history.The following research results were obtained.First,the rock types of ultra-deep reservoir of the Bashijiqike Formation in this area are medium-and fine-grained feldspathic litharenite and lithic arkose with point-line contact between grains,and its reservoir space is dominated by primary intergranular pores.At present,it is still at its middle diagenetic stage.Second,different from other ultra-deep fractured low-porosity sandstone reservoirs,this set of ultra-deep reservoir is a pore-type reservoir with porosity of 4e13%,permeability of 0.1-50.0 mD and better porosity and permeability correlation.Third,during the sedimentation of the Bashijiqike Formation,thick sand bodies of delta front were widely developed,medium-and fine-grained sandstones accounted for more than 85%and grains had strong compressive capacity.After that,this reservoir experienced long-term shallow burial during the earlyemedium stage and rapid deep burial during the late stage,and the burial compaction effect was weaker.During the late stage,a canopy structure was formed from the overlying Paleogene thick gypsum salt bed due to thrust and compression,and it further suppressed vertical compaction.In the meantime,the study area was far from the orogenic belt and the structural transition zone,so the lateral compressive stress was weak.Therefore,the primary intergranular pores were preserved in large quantities.It is concluded that coarse lithology,weak compaction and low tectonic stress are the key factors to the development of this ultra-deep high-quality reservoir.In addition,the development of large-scale effective reservoirs deeper than 7000 m provides favorable material conditions for the high-abundance enrichment of natural gas and the reserves of trillion cubic meters in the Kuqa Depression,and the oil and gas exploration potential is huge.展开更多
China and Ukraine are looking forward to deepening their cooperation on sectors including agriculture,infrastructure and energy to achieve mutual benefits and win-win outcomes,representatives from the two countries sa...China and Ukraine are looking forward to deepening their cooperation on sectors including agriculture,infrastructure and energy to achieve mutual benefits and win-win outcomes,representatives from the two countries said at an economic and trade forum on November8.展开更多
CHINA＇S state leaders have a universal image of serious faces, jet black hair and dark austere suits. But a recent cartoon video is changing this stere- otype.
The year 2016 was rich in events for China-Africa cooperation, with significant progress being made on key aspects at different levels. Major breakthroughs have been achieved for both sides dur- ing the year＇s major...The year 2016 was rich in events for China-Africa cooperation, with significant progress being made on key aspects at different levels. Major breakthroughs have been achieved for both sides dur- ing the year＇s major international events, including China＇s strong support for a plan on Africa＇s industrialization during the Hang- zhou G20 Summit.展开更多
Political scientist Yan Xuetong’s analysis of changes in today’s global leadership is inspiring to all Polling organization Gallup’s Rating World Leaders:2019 poll on global leadership provided a sobering message t...Political scientist Yan Xuetong’s analysis of changes in today’s global leadership is inspiring to all Polling organization Gallup’s Rating World Leaders:2019 poll on global leadership provided a sobering message to U.S.citizens accustomed to widespread respect.The median rating for U.S.global leadership in more than 130 nations stood at 31 percent,3 percentage points behind China and just 1 percentage point above Russia.展开更多
Following the successful launch of the Chang ’e-1 satellite in 2007, Chang ’e-2 was lifted off by a Long March 3 carrier rocket on October 1, marking the beginning of the second phase of China’s lunar probe project.
为解决超千米深井巷道建设面临的严峻挑战,通过对现有的巷道掘进、支护技术与全断面岩石隧道掘进机(TBM)技术对比分析,结果表明:全断面岩石隧道掘进机优势明显,且满足超千米深井巷道建设的需求,现代化大型矿井也具备引入全断面掘进机的...为解决超千米深井巷道建设面临的严峻挑战,通过对现有的巷道掘进、支护技术与全断面岩石隧道掘进机(TBM)技术对比分析,结果表明:全断面岩石隧道掘进机优势明显,且满足超千米深井巷道建设的需求,现代化大型矿井也具备引入全断面掘进机的条件,将TBM引入超千米深井巷道建设,在解决所涉及的关键岩石力学和机械制造问题后加以改进,称之为全断面岩石巷道掘进机(RBM——Full Face Roadway Boring Machine)。由于煤矿深部巷道的建设环境与隧洞建设环境存在显著差异,RBM施工将面临两大关键问题——卡盾和刀盘破岩问题。为了揭示RBM卡盾机理,指出了其关键岩石力学问题,包括超千米深井巷道RBM开挖卸荷路径下围岩挤压大变形机理,护盾周围围岩挤压变形分布规律,围岩-护盾-支护相互作用机理,卡盾判据,卡盾防治理论及方法。展开更多
基金supported by the Strategic Priority Research Program of Chinese Academy of Sciences [grant number XDA17010105]the National Natural Science Foundation of China [grant numbers 91437105,41430533,and 41575041]the Key Research Program of Frontier Sciences [grant number QYZDY-SSW-DQC018]
文摘By using a linear baroclinic model(LBM),this study investigates the different Rossby wave train(RWT)patterns associated with the Tibetan Plateau(TP)upper-atmospheric heat source(TPUHS)that is anomalously shallower and deeper in boreal summer.Observational results indicate the different RWT patterns between the developing and decaying periods of synoptic TPUHS events,when the anomalous TPUHS develops from a relatively shallower to a deeper TP heat source.Based on the different vertical heating profiles between these two periods in observation,this study forces the LBM with prescribed TPUHS profiles to mimic a shallower and deeper summer TP heat source.The results show that the atmospheric responses to a shallower and deeper TPUHS do exhibit different RWT patterns that largely resemble those in observation.Namely,corresponding RWT pattern to a shallower TPUHS stretches from the TP to the west coast of America,while that to a deeper TPUHS extends from the TP region to Alaska.
基金The Project of China Vocational Education Association(ZJS2022YB024)。
文摘This paper addresses the problems faced in programmable logic controller(PLC)teaching in vocational colleges and proposes countermeasures to overcome these challenges.The study emphasizes the need for a deeper understanding of fundamental concepts and the integration of practical application in PLC education.It suggests involving students in teacher-led projects to enhance their programming skills and problem-solving skills.Additionally,the paper highlights the importance of interactive learning and collaborative discussions to foster student engagement.Furthermore,it emphasizes the cultivation of innovation consciousness through participation in innovation competitions and projects.The implementation of these strategies has shown positive results in improving learning outcomes and preparing students for careers in automation and control.This research contributes to the development of effective teaching approaches in PLC education in vocational colleges.
基金supported by the National Major Science and Technology Project“Geological evolution process,deep structure and reservoir characteristics of foreland thrust belts and complex structural areas”(No.:2016ZX05003-001)“Main control factors for formation of large lithologic reservoirs and evaluation of favorable zones”(No.:2017ZX05001-002)PetroChina Science and Technology Project“Sand body types and reservoir control mechanism of large continental sedimentary basins”(No.:2019B-0309).
文摘Ultra-deep clastic reservoirs generally have poor physical properties and low single-well productivity,but Well BZ9,which is newly drilled in the Kuqa Depression of Tarim Basin,NW China,encounters a thick high-quality reservoir in the Bashijiqike Formation of Lower Cretaceous deeper than 7600 m and produces a high-yield industrial gas flow.In order to reveal the characteristics and genesis of the Bashijiqike Formation reservoir and reduce the exploration risk of ultra-deep oil and gas layers,we discussed its characteristics,genetic mechanism and oil&gas exploration significance based on cores,well logging and experimental analysis,combined with regional temperatureepressure conditions and burial evolution history.The following research results were obtained.First,the rock types of ultra-deep reservoir of the Bashijiqike Formation in this area are medium-and fine-grained feldspathic litharenite and lithic arkose with point-line contact between grains,and its reservoir space is dominated by primary intergranular pores.At present,it is still at its middle diagenetic stage.Second,different from other ultra-deep fractured low-porosity sandstone reservoirs,this set of ultra-deep reservoir is a pore-type reservoir with porosity of 4e13%,permeability of 0.1-50.0 mD and better porosity and permeability correlation.Third,during the sedimentation of the Bashijiqike Formation,thick sand bodies of delta front were widely developed,medium-and fine-grained sandstones accounted for more than 85%and grains had strong compressive capacity.After that,this reservoir experienced long-term shallow burial during the earlyemedium stage and rapid deep burial during the late stage,and the burial compaction effect was weaker.During the late stage,a canopy structure was formed from the overlying Paleogene thick gypsum salt bed due to thrust and compression,and it further suppressed vertical compaction.In the meantime,the study area was far from the orogenic belt and the structural transition zone,so the lateral compressive stress was weak.Therefore,the primary intergranular pores were preserved in large quantities.It is concluded that coarse lithology,weak compaction and low tectonic stress are the key factors to the development of this ultra-deep high-quality reservoir.In addition,the development of large-scale effective reservoirs deeper than 7000 m provides favorable material conditions for the high-abundance enrichment of natural gas and the reserves of trillion cubic meters in the Kuqa Depression,and the oil and gas exploration potential is huge.
文摘China and Ukraine are looking forward to deepening their cooperation on sectors including agriculture,infrastructure and energy to achieve mutual benefits and win-win outcomes,representatives from the two countries said at an economic and trade forum on November8.
文摘CHINA＇S state leaders have a universal image of serious faces, jet black hair and dark austere suits. But a recent cartoon video is changing this stere- otype.
文摘The year 2016 was rich in events for China-Africa cooperation, with significant progress being made on key aspects at different levels. Major breakthroughs have been achieved for both sides dur- ing the year＇s major international events, including China＇s strong support for a plan on Africa＇s industrialization during the Hang- zhou G20 Summit.
文摘Political scientist Yan Xuetong’s analysis of changes in today’s global leadership is inspiring to all Polling organization Gallup’s Rating World Leaders:2019 poll on global leadership provided a sobering message to U.S.citizens accustomed to widespread respect.The median rating for U.S.global leadership in more than 130 nations stood at 31 percent,3 percentage points behind China and just 1 percentage point above Russia.
文摘Following the successful launch of the Chang ’e-1 satellite in 2007, Chang ’e-2 was lifted off by a Long March 3 carrier rocket on October 1, marking the beginning of the second phase of China’s lunar probe project.
文摘为解决超千米深井巷道建设面临的严峻挑战,通过对现有的巷道掘进、支护技术与全断面岩石隧道掘进机(TBM)技术对比分析,结果表明:全断面岩石隧道掘进机优势明显,且满足超千米深井巷道建设的需求,现代化大型矿井也具备引入全断面掘进机的条件,将TBM引入超千米深井巷道建设,在解决所涉及的关键岩石力学和机械制造问题后加以改进,称之为全断面岩石巷道掘进机(RBM——Full Face Roadway Boring Machine)。由于煤矿深部巷道的建设环境与隧洞建设环境存在显著差异,RBM施工将面临两大关键问题——卡盾和刀盘破岩问题。为了揭示RBM卡盾机理,指出了其关键岩石力学问题,包括超千米深井巷道RBM开挖卸荷路径下围岩挤压大变形机理,护盾周围围岩挤压变形分布规律,围岩-护盾-支护相互作用机理,卡盾判据,卡盾防治理论及方法。
