Large-scale Cenozoic magmatic rocks from the interplay between the Indian and Eurasian plate are exposed in the Yulong porphyry copper belt in the northern Jinshajiang-Ailaoshan domain.Alkali-rich magmas along the Yul...Large-scale Cenozoic magmatic rocks from the interplay between the Indian and Eurasian plate are exposed in the Yulong porphyry copper belt in the northern Jinshajiang-Ailaoshan domain.Alkali-rich magmas along the Yulong porphyry copper belt can reveal the tectono-magmatic processes in the Sanjiang region.In this study,we present new zircon U-Pb-Hf isotopes and whole rock geochemistry of Cenozoic granitoids from the Zhalaga area in the northern Yulong porphyry copper belt.The Zircon U-Pb dating results show that the Zhalaga granitic porphyry crystallized at ca.42-38 Ma.These porphyry deposits are depleted in Nb,Ta,Sr,and Ti enriched in alkaline and rare earth elements(REEs),and exhibit high zircon saturation temperatures,that strongly indicate A-type affinity.These data and the generally positiveεHf(t)values(2.0-4.5)suggest the magmas originated from a hybrid of partial melting of subduction-modified lithospheric mantle,possibly triggered by upwelling of the asthenospheric mantle.Geochronological and geochemical data of the current and previous studies distinguish three magmatic phases during the Cenozoic in the Jinshajiang-Ailaoshan region:(1)ca.62-48 Ma;(2)ca.44-30 Ma;and(3)ca.28-16 Ma.The strong collision between the Indian and Eurasian plates produced relatively fast convergence rates during the first episode(ca.62-48 Ma),whereas the subsequent right-lateral strike-slip faulting in the Jinshajiang fault zone initiated at ca.43 Ma is associated with the relatively low India-Eurasia convergence rates during ca.44-30 Ma.These significantly impacted the nature and spatial distribution of the magmatism and the large-scale metallogeny during the Cenozoic in the Sanjiang region.We suggest that the Zhalaga alkali-rich magmas occurred in a transition period from involving soft to hard collisional settings.This remarkable example demonstrates that alkali-rich magmas with A-type affinity are also generated in an orogenic tectonic setting.展开更多
Using in situ measurement data from May-June, 1998, and data from the Asian seas international acoustics experiment （ASIAEX） from 2001 in the South China Sea （SCS）, the spectral density function and the dissipa- t...Using in situ measurement data from May-June, 1998, and data from the Asian seas international acoustics experiment （ASIAEX） from 2001 in the South China Sea （SCS）, the spectral density function and the dissipa- tion spectrum function are estimated. In the inffa-gravity wave （IGW） band, the power spectra of velocity （u, v, w） are universal functions with respect to characteristic frequencies, which correspond to the peak fre- quencies of the dissipation spectrum （PFDS）. This suggests that high-frequency internal waves in the IGW band have similar dynamical characteristics. In addition, the evolution of these characteristic frequencies is explored and its highest value is 8.8 cph （cycles per hour, 1 cph=2.778× 10-3 Hz）.展开更多
目的检验中文版自我管理和过渡期准备问卷[self-management and transition to adulthood with Rx=treatment(STARx)questionnaire]在青少年癫痫患者中的信度和效度。方法采用便利抽样法,选取436名确诊癫痫的青少年患者为研究对象,样本1...目的检验中文版自我管理和过渡期准备问卷[self-management and transition to adulthood with Rx=treatment(STARx)questionnaire]在青少年癫痫患者中的信度和效度。方法采用便利抽样法,选取436名确诊癫痫的青少年患者为研究对象,样本1共250例,采用条目水平的内容效度指数(item-level content validity index,I-CVI)和问卷水平的内容效度指数(scale-level content validity index,S-CVI)评价问卷的内容效度,采用探索性因子分析对量表结构进行探索,采用Cronbachα系数评价量表的内部一致性信度。样本2186例,采用验证性因子分析验证量表的结构效度,采用Cronbachα系数、Spearman-Brown系数和重测信度系数评价量表的信度。结果中文版STARx的总条目内容效度指数为0.981,条目水平的内容效度指数为0.833~1.000;问卷探索性因子分析,特征值>1的公因子有4个,累积方差贡献率为70.309%,且各条目在其公因子上的负荷值为0.636~0.831,较原问卷6个维度减少了2个维度;验证性因子分析显示,卡方比自由度(chi-square/degree of freedom,χ^(2)/df)为2.53(<3),近似误差均方根为0.091(<0.1),数据与模型的拟合度良好;问卷总的Cronbachα系数为0.917,折半信度为0.730,重测信度为0.940。结论STARx在青少年癫痫患者的检验中显示信度、效度良好,可作为评价癫痫青少年至成人过渡期准备水平的有效工具。展开更多
China’s natural gas industry saw a strong rebound in supply and demand in 2021,with apparent consumption reaching 372.6 billion m^(3),up by 12.7%year on year.The increase in domestic gas reserves and production conti...China’s natural gas industry saw a strong rebound in supply and demand in 2021,with apparent consumption reaching 372.6 billion m^(3),up by 12.7%year on year.The increase in domestic gas reserves and production continued to advance,with production reaching 208.6 billion m^(3),an increase of more than 10 billion m^(3) for five consecutive years.Imported natural gas grew at a high rate,with imported pipeline gas and imported LNG totaling 169.1 billion m^(3) in 2021,up by 20.9%year on year,making China the world’s top LNG importer for the first time.In 2022,as China’s economy continues to recover steadily and the development of clean energy decarbonization continues under the“Carbon Peaking and Carbon Neutrality Goals”strategy,the natural gas market will maintain sustained growth,but the incremental demand level and growth rate will be lower than in 2021,with demand growth expected to reach 6%-7%.展开更多
为实现工业5G在非授权频段的高实时、高可靠无线通信,提出了一种多优先级的动态信道接入方法,以满足异构工业任务的按需通信。该方法通过对多种无线网络共享的非授权频段进行实时信道监听,可以根据信道占用率动态切换信道接入方式,包括...为实现工业5G在非授权频段的高实时、高可靠无线通信,提出了一种多优先级的动态信道接入方法,以满足异构工业任务的按需通信。该方法通过对多种无线网络共享的非授权频段进行实时信道监听,可以根据信道占用率动态切换信道接入方式,包括随机接入和确定性接入。其中,根据异构工业任务的实时性要求,定义了多种接入优先级,并确定合适的竞争和退避时间窗口。仿真结果表明,在工业多设备接入场景下,所提方法的信道传输可靠性达到99.99%,并且实时性比WiFi的载波侦听多路接入/碰撞避免机制(Carrier Sense Multiple Access with Collision Avoidance,CSMA/CA)和授权辅助接入(Licensed Assisted Access,LAA)的先听后说(Listen before Talk,LBT)机制分别提升了24.7%和46.3%。展开更多
基金supported by the National Natural Science Foundation of China(No.41776056)Natural Science Foundation of Guangdong Province(Nos.2017A030310395,2018B030311030)China Postdoctoral Science Foundation(grant No.2020M672671)。
文摘Large-scale Cenozoic magmatic rocks from the interplay between the Indian and Eurasian plate are exposed in the Yulong porphyry copper belt in the northern Jinshajiang-Ailaoshan domain.Alkali-rich magmas along the Yulong porphyry copper belt can reveal the tectono-magmatic processes in the Sanjiang region.In this study,we present new zircon U-Pb-Hf isotopes and whole rock geochemistry of Cenozoic granitoids from the Zhalaga area in the northern Yulong porphyry copper belt.The Zircon U-Pb dating results show that the Zhalaga granitic porphyry crystallized at ca.42-38 Ma.These porphyry deposits are depleted in Nb,Ta,Sr,and Ti enriched in alkaline and rare earth elements(REEs),and exhibit high zircon saturation temperatures,that strongly indicate A-type affinity.These data and the generally positiveεHf(t)values(2.0-4.5)suggest the magmas originated from a hybrid of partial melting of subduction-modified lithospheric mantle,possibly triggered by upwelling of the asthenospheric mantle.Geochronological and geochemical data of the current and previous studies distinguish three magmatic phases during the Cenozoic in the Jinshajiang-Ailaoshan region:(1)ca.62-48 Ma;(2)ca.44-30 Ma;and(3)ca.28-16 Ma.The strong collision between the Indian and Eurasian plates produced relatively fast convergence rates during the first episode(ca.62-48 Ma),whereas the subsequent right-lateral strike-slip faulting in the Jinshajiang fault zone initiated at ca.43 Ma is associated with the relatively low India-Eurasia convergence rates during ca.44-30 Ma.These significantly impacted the nature and spatial distribution of the magmatism and the large-scale metallogeny during the Cenozoic in the Sanjiang region.We suggest that the Zhalaga alkali-rich magmas occurred in a transition period from involving soft to hard collisional settings.This remarkable example demonstrates that alkali-rich magmas with A-type affinity are also generated in an orogenic tectonic setting.
基金The National Basic Research Program of China under contract No.2011 CB403505the National Natural Science Foundation of China under contract Nos U1033002,41276021 and 10972229
文摘Using in situ measurement data from May-June, 1998, and data from the Asian seas international acoustics experiment （ASIAEX） from 2001 in the South China Sea （SCS）, the spectral density function and the dissipa- tion spectrum function are estimated. In the inffa-gravity wave （IGW） band, the power spectra of velocity （u, v, w） are universal functions with respect to characteristic frequencies, which correspond to the peak fre- quencies of the dissipation spectrum （PFDS）. This suggests that high-frequency internal waves in the IGW band have similar dynamical characteristics. In addition, the evolution of these characteristic frequencies is explored and its highest value is 8.8 cph （cycles per hour, 1 cph=2.778× 10-3 Hz）.
文摘目的检验中文版自我管理和过渡期准备问卷[self-management and transition to adulthood with Rx=treatment(STARx)questionnaire]在青少年癫痫患者中的信度和效度。方法采用便利抽样法,选取436名确诊癫痫的青少年患者为研究对象,样本1共250例,采用条目水平的内容效度指数(item-level content validity index,I-CVI)和问卷水平的内容效度指数(scale-level content validity index,S-CVI)评价问卷的内容效度,采用探索性因子分析对量表结构进行探索,采用Cronbachα系数评价量表的内部一致性信度。样本2186例,采用验证性因子分析验证量表的结构效度,采用Cronbachα系数、Spearman-Brown系数和重测信度系数评价量表的信度。结果中文版STARx的总条目内容效度指数为0.981,条目水平的内容效度指数为0.833~1.000;问卷探索性因子分析,特征值>1的公因子有4个,累积方差贡献率为70.309%,且各条目在其公因子上的负荷值为0.636~0.831,较原问卷6个维度减少了2个维度;验证性因子分析显示,卡方比自由度(chi-square/degree of freedom,χ^(2)/df)为2.53(<3),近似误差均方根为0.091(<0.1),数据与模型的拟合度良好;问卷总的Cronbachα系数为0.917,折半信度为0.730,重测信度为0.940。结论STARx在青少年癫痫患者的检验中显示信度、效度良好,可作为评价癫痫青少年至成人过渡期准备水平的有效工具。
文摘China’s natural gas industry saw a strong rebound in supply and demand in 2021,with apparent consumption reaching 372.6 billion m^(3),up by 12.7%year on year.The increase in domestic gas reserves and production continued to advance,with production reaching 208.6 billion m^(3),an increase of more than 10 billion m^(3) for five consecutive years.Imported natural gas grew at a high rate,with imported pipeline gas and imported LNG totaling 169.1 billion m^(3) in 2021,up by 20.9%year on year,making China the world’s top LNG importer for the first time.In 2022,as China’s economy continues to recover steadily and the development of clean energy decarbonization continues under the“Carbon Peaking and Carbon Neutrality Goals”strategy,the natural gas market will maintain sustained growth,but the incremental demand level and growth rate will be lower than in 2021,with demand growth expected to reach 6%-7%.
文摘为实现工业5G在非授权频段的高实时、高可靠无线通信,提出了一种多优先级的动态信道接入方法,以满足异构工业任务的按需通信。该方法通过对多种无线网络共享的非授权频段进行实时信道监听,可以根据信道占用率动态切换信道接入方式,包括随机接入和确定性接入。其中,根据异构工业任务的实时性要求,定义了多种接入优先级,并确定合适的竞争和退避时间窗口。仿真结果表明,在工业多设备接入场景下,所提方法的信道传输可靠性达到99.99%,并且实时性比WiFi的载波侦听多路接入/碰撞避免机制(Carrier Sense Multiple Access with Collision Avoidance,CSMA/CA)和授权辅助接入(Licensed Assisted Access,LAA)的先听后说(Listen before Talk,LBT)机制分别提升了24.7%和46.3%。
