Researching and comprehending the characteristics of destructive seismic motions is essential for the seismic design of critical infrastructure.This study employs historical data from the M 7.5 earthquake that occurre...Researching and comprehending the characteristics of destructive seismic motions is essential for the seismic design of critical infrastructure.This study employs historical data from the M 7.5 earthquake that occurred in 1850 to simulate the impacts of a M 7.5 event on hydropower stations located in proximity to Xichang.Key factors taken into account in the simulation of seismic motion encompass uncertainties,mixed-source models,and the placement of asperities.Through these simulations,we acquired the peak ground acceleration(PGA),acceleration time histories,and acceleration response spectra for the hydropower facilities affected by the earthquake.To perform a comprehensive analysis,we utilized a multi-scenario stochastic finite fault simulation method to estimate parameters including the minimum,average,and maximum values of PGA and pseudo-spectral acceleration(PSA)response spectra.Additionally,we assessed the 50^(th),84^(th),and 95^(th)percentiles values of the peak ground acceleration and pseudo-spectral acceleration response spectra.The simulation results also include peak ground acceleration field maps and peak ground velocity(PGV)field maps and intensity distribution maps pertaining to the earthquake.The findings demonstrate that the intensity maps produced through the stochastic finite fault method closely correspond with the intensity contour maps published of historical seismic records.These findings offer significant insights for the seismic safety evaluation and design of the specified hydropower stations.Moreover,this multi-scenario methodology can be effectively utilized for other critical infrastructure projects to derive dependable seismic motion parameters.展开更多
With the advent of the post-industrial era, a large number of idle old industrial buildings have been produced in the city. How to deal with idle old industrial buildings has become a reality. Taking the transformatio...With the advent of the post-industrial era, a large number of idle old industrial buildings have been produced in the city. How to deal with idle old industrial buildings has become a reality. Taking the transformation of the factory building of Chang'an Machinery Plant in Xichang for example, the paper analyzed the recycling strategy of old industrial buildings from the basic conditions and transformation contents of the project, re-constructed the new connotation of the building, so as to exert the use value of the old industrial buildings, with a view to providing a reference for the organic renewal and sustainable development of the city.展开更多
With the advent of the regional tourism era,ethnic tourism service management in Xichang City,Liangshan Prefecture,faces new challenges and opportunities.This paper provides an in-depth analysis of the current state o...With the advent of the regional tourism era,ethnic tourism service management in Xichang City,Liangshan Prefecture,faces new challenges and opportunities.This paper provides an in-depth analysis of the current state of ethnic tourism service management in Xichang City,identifying existing issues such as uneven service quality,an imperfect management system,and the need for improved professional quality among service personnel.To address these problems,the paper proposes several countermeasures,including establishing a service system oriented toward tourists’needs,enhancing professional training for service personnel,and optimizing the management model for tourism service quality.The study aims to promote the sustainable,rapid,and healthy development of tourism in Xichang City,Liangshan Prefecture,and contribute to the prosperity of tourism in Sichuan Province by improving the management level of ethnic tourism services.展开更多
Fluid inclusions are commonly observed in various stages during the diagenetic evolution and the generation, migration and arcumulation of hydrocarbons in LowerPermian carbonate rocks in the Xichang Basin, providing d...Fluid inclusions are commonly observed in various stages during the diagenetic evolution and the generation, migration and arcumulation of hydrocarbons in LowerPermian carbonate rocks in the Xichang Basin, providing direct physico-chemical evidencefor the process. Altogether seven stages can be recognized, i.e., the penecontemporaneous, early and mid-late diagenetic stages, the epidiagenetic stage and the eary, middleand late reburying stages. Karst and dissolution pores and structural fissures developedduring the epidiagenetic and reburying stages constitute the major reservoirs for hydrocarbon accumulation. Oil generation and migration began in the early reburying stagein Late Permian time and decloped to its climax in the middle reburying stage in theTriassic period, followed by extensive generation and migration of natural gases duringthe late stage of reburying in tbe Jurassic and later periods. The generation, migrationand accumulation of hydrocarbons are closely related to Hercynian basalt eruption andIndosinian and Yenshanian tecto-magmatism.展开更多
Panzhihua-Xichang (Panxi) micro-palaeoland is the oldest terrane on the western margin of the Yangtze Block. Some intermediate-basic granulites are considered to be the crys-talline basement of lower crust in the terr...Panzhihua-Xichang (Panxi) micro-palaeoland is the oldest terrane on the western margin of the Yangtze Block. Some intermediate-basic granulites are considered to be the crys-talline basement of lower crust in the terrane. Granulite-facies metamorphism of the granulites was developed in the period from 1186 Ma to 1128 Ma. The origin of granulites was related to the collision orogenic process occurring when the micro-palaeolands merged to form the Rodinia Supercontinent. Amphibolite-facies retrogressive metamorphism of granulites took place in the period from 877 Ma to 825 Ma. This period was consistent with the breakup time of the Rodinia Supercontinent. 40Ar/39Ar ages and fission track (FT) ages of granulites in the Panxi mi-cro-palaeoland show that the vertical movement history of crustal rocks was a slow uplift process of the rigid terrane in the time from Neoproterozoic to Mesozoic. The subduction of India Plate towards Euroasia Plate resulted in the rapid uplift of the Qinghai-Tibetan Block in Cenozoic. Meanwhile, the Qinghai-Tibetan Block moved towards east. Consequently the Panxi terrane was uplifted rapidly. As a result of the collision orogeny between the Qinghai-Tibetan Block and the Panxi terrane, the granulite-facies crystalline basement in this region was exhumed and exposed to the surface.展开更多
Upper Triassic and Middle Jurassic strata of the Xichang Basin in Sichuan Province, southwestern China, yielded important dinosaur ichnofossils. From the Xujiahe Formation of the Yiguojiao tracksite, we report a Late ...Upper Triassic and Middle Jurassic strata of the Xichang Basin in Sichuan Province, southwestern China, yielded important dinosaur ichnofossils. From the Xujiahe Formation of the Yiguojiao tracksite, we report a Late Triassic footprint assemblage in China and the first discovery of diagnostic Triassic sauropodomorph tracks in this region. The tracks share a number of features in common with the ichnogenera Eosauropus(Late Triassic) and Liujianpus(Early Jurassic). The neighboring Bingtu tracksite is stratigraphically younger(Shaximiao Formation, Middle Jurassic) and preserves small tridactyl theropod tracks that represent the first occurrence of the ichnotaxon Carmelopodus in China and Asia. While these tracks are morphologically comparable to those from the Middle Jurassic type locality in North America, the specimens from China show the proximal margin of the digit IV impression in a more cranial position, which may indicate a trackmaker with a relatively short metatarsal IV. In addition to the skeletal record, the Carmelopodus footprints document the presence of small theropods in the dinosaur fauna of the Middle Jurassic Shaximiao Formation.展开更多
Sent out at 1:31am GMT+8 on May 29 by a Long March-3B carrier rocket from the Xichang Satellite Launch Center in Sichuan province,China,Tianwen-2,the second mission of China’s Planetary Exploration Program,correctly ...Sent out at 1:31am GMT+8 on May 29 by a Long March-3B carrier rocket from the Xichang Satellite Launch Center in Sichuan province,China,Tianwen-2,the second mission of China’s Planetary Exploration Program,correctly entered the transfer trajectory toward an asteroid named 2016HO3 after flying for 18 minutes.Its solar wings unfolded properly,signaling a successful start,and primed for the next stage of its mission.展开更多
目的:调查四川地区北川羌族和西昌彝族两个少数民族群体中19个X-STRs基因座的遗传多态性,评估其法医学应用价值,并分析其群体结构。方法:收集北川羌族人群无关个体246例(男性188例,女性58例)和西昌彝族人群无关个体281例(男性116例,女性...目的:调查四川地区北川羌族和西昌彝族两个少数民族群体中19个X-STRs基因座的遗传多态性,评估其法医学应用价值,并分析其群体结构。方法:收集北川羌族人群无关个体246例(男性188例,女性58例)和西昌彝族人群无关个体281例(男性116例,女性165例)干血斑样本,采用Microreader^(TM)19X ID System kit直接扩增干血斑样本,ABI3500遗传分析仪对PCR产物进行毛细管电泳,GeneMapper■ ID-X软件自动分型。结果:在北川羌族群体中,共检测到150个等位基因,频率范围0.0033~0.8289;在西昌彝族群体中,共检测到164个等位基因,频率范围0.0022~0.8004。经统计学检验,两个少数民族群体基因频率分布均符合Hardy-Weinberg平衡定律(P>0.05),经Bonferroni校正后,不存在连锁不平衡的基因座。在北川羌族群体中,男性个体识别能力(PDM)和女性个体识别能力(PDF)分别是0.999999999945624、0.99999999999999999322,二联体和三联体累积平均排除概率分别是0.999999591813975、0.999999999465296;在西昌彝族群体中,男性个体识别能力(PDM)和女性个体识别能力(PDF)分别为0.999999999873529、1;二联体和三联体累积平均排除概率分别是0.999999284224924、0.999999998931424。结论:Microreader TM 19X ID荧光检测试剂盒在北川羌族和西昌彝族人群中总体多态性较高,鉴别能力较好,可作为亲权关系和个体识别有力的补充和验证手段。展开更多
基金the support of National Natural Science Foundation of China(Grant Numbers 52192675 and 52378541)。
文摘Researching and comprehending the characteristics of destructive seismic motions is essential for the seismic design of critical infrastructure.This study employs historical data from the M 7.5 earthquake that occurred in 1850 to simulate the impacts of a M 7.5 event on hydropower stations located in proximity to Xichang.Key factors taken into account in the simulation of seismic motion encompass uncertainties,mixed-source models,and the placement of asperities.Through these simulations,we acquired the peak ground acceleration(PGA),acceleration time histories,and acceleration response spectra for the hydropower facilities affected by the earthquake.To perform a comprehensive analysis,we utilized a multi-scenario stochastic finite fault simulation method to estimate parameters including the minimum,average,and maximum values of PGA and pseudo-spectral acceleration(PSA)response spectra.Additionally,we assessed the 50^(th),84^(th),and 95^(th)percentiles values of the peak ground acceleration and pseudo-spectral acceleration response spectra.The simulation results also include peak ground acceleration field maps and peak ground velocity(PGV)field maps and intensity distribution maps pertaining to the earthquake.The findings demonstrate that the intensity maps produced through the stochastic finite fault method closely correspond with the intensity contour maps published of historical seismic records.These findings offer significant insights for the seismic safety evaluation and design of the specified hydropower stations.Moreover,this multi-scenario methodology can be effectively utilized for other critical infrastructure projects to derive dependable seismic motion parameters.
文摘With the advent of the post-industrial era, a large number of idle old industrial buildings have been produced in the city. How to deal with idle old industrial buildings has become a reality. Taking the transformation of the factory building of Chang'an Machinery Plant in Xichang for example, the paper analyzed the recycling strategy of old industrial buildings from the basic conditions and transformation contents of the project, re-constructed the new connotation of the building, so as to exert the use value of the old industrial buildings, with a view to providing a reference for the organic renewal and sustainable development of the city.
文摘With the advent of the regional tourism era,ethnic tourism service management in Xichang City,Liangshan Prefecture,faces new challenges and opportunities.This paper provides an in-depth analysis of the current state of ethnic tourism service management in Xichang City,identifying existing issues such as uneven service quality,an imperfect management system,and the need for improved professional quality among service personnel.To address these problems,the paper proposes several countermeasures,including establishing a service system oriented toward tourists’needs,enhancing professional training for service personnel,and optimizing the management model for tourism service quality.The study aims to promote the sustainable,rapid,and healthy development of tourism in Xichang City,Liangshan Prefecture,and contribute to the prosperity of tourism in Sichuan Province by improving the management level of ethnic tourism services.
文摘Fluid inclusions are commonly observed in various stages during the diagenetic evolution and the generation, migration and arcumulation of hydrocarbons in LowerPermian carbonate rocks in the Xichang Basin, providing direct physico-chemical evidencefor the process. Altogether seven stages can be recognized, i.e., the penecontemporaneous, early and mid-late diagenetic stages, the epidiagenetic stage and the eary, middleand late reburying stages. Karst and dissolution pores and structural fissures developedduring the epidiagenetic and reburying stages constitute the major reservoirs for hydrocarbon accumulation. Oil generation and migration began in the early reburying stagein Late Permian time and decloped to its climax in the middle reburying stage in theTriassic period, followed by extensive generation and migration of natural gases duringthe late stage of reburying in tbe Jurassic and later periods. The generation, migrationand accumulation of hydrocarbons are closely related to Hercynian basalt eruption andIndosinian and Yenshanian tecto-magmatism.
基金This work was supported by the National Natural Science Foundation of China(Grant No.49972062)by the Ministry of Education(Grant No.104089).
文摘Panzhihua-Xichang (Panxi) micro-palaeoland is the oldest terrane on the western margin of the Yangtze Block. Some intermediate-basic granulites are considered to be the crys-talline basement of lower crust in the terrane. Granulite-facies metamorphism of the granulites was developed in the period from 1186 Ma to 1128 Ma. The origin of granulites was related to the collision orogenic process occurring when the micro-palaeolands merged to form the Rodinia Supercontinent. Amphibolite-facies retrogressive metamorphism of granulites took place in the period from 877 Ma to 825 Ma. This period was consistent with the breakup time of the Rodinia Supercontinent. 40Ar/39Ar ages and fission track (FT) ages of granulites in the Panxi mi-cro-palaeoland show that the vertical movement history of crustal rocks was a slow uplift process of the rigid terrane in the time from Neoproterozoic to Mesozoic. The subduction of India Plate towards Euroasia Plate resulted in the rapid uplift of the Qinghai-Tibetan Block in Cenozoic. Meanwhile, the Qinghai-Tibetan Block moved towards east. Consequently the Panxi terrane was uplifted rapidly. As a result of the collision orogeny between the Qinghai-Tibetan Block and the Panxi terrane, the granulite-facies crystalline basement in this region was exhumed and exposed to the surface.
基金supported by the National Natural Science Foundation of China (Grant No.41772008)the State Key Laboratory of Palaeobiology and Stratigraphy(Nanjing Institute of Geology and Palaeontology, CAS)(Grant No.173127)and the comprehensive geological and mineral survey in Wumeng mountainous area conducted by China Geological Survey (Grant No.121201010000150002)
文摘Upper Triassic and Middle Jurassic strata of the Xichang Basin in Sichuan Province, southwestern China, yielded important dinosaur ichnofossils. From the Xujiahe Formation of the Yiguojiao tracksite, we report a Late Triassic footprint assemblage in China and the first discovery of diagnostic Triassic sauropodomorph tracks in this region. The tracks share a number of features in common with the ichnogenera Eosauropus(Late Triassic) and Liujianpus(Early Jurassic). The neighboring Bingtu tracksite is stratigraphically younger(Shaximiao Formation, Middle Jurassic) and preserves small tridactyl theropod tracks that represent the first occurrence of the ichnotaxon Carmelopodus in China and Asia. While these tracks are morphologically comparable to those from the Middle Jurassic type locality in North America, the specimens from China show the proximal margin of the digit IV impression in a more cranial position, which may indicate a trackmaker with a relatively short metatarsal IV. In addition to the skeletal record, the Carmelopodus footprints document the presence of small theropods in the dinosaur fauna of the Middle Jurassic Shaximiao Formation.
文摘Sent out at 1:31am GMT+8 on May 29 by a Long March-3B carrier rocket from the Xichang Satellite Launch Center in Sichuan province,China,Tianwen-2,the second mission of China’s Planetary Exploration Program,correctly entered the transfer trajectory toward an asteroid named 2016HO3 after flying for 18 minutes.Its solar wings unfolded properly,signaling a successful start,and primed for the next stage of its mission.
文摘目的:调查四川地区北川羌族和西昌彝族两个少数民族群体中19个X-STRs基因座的遗传多态性,评估其法医学应用价值,并分析其群体结构。方法:收集北川羌族人群无关个体246例(男性188例,女性58例)和西昌彝族人群无关个体281例(男性116例,女性165例)干血斑样本,采用Microreader^(TM)19X ID System kit直接扩增干血斑样本,ABI3500遗传分析仪对PCR产物进行毛细管电泳,GeneMapper■ ID-X软件自动分型。结果:在北川羌族群体中,共检测到150个等位基因,频率范围0.0033~0.8289;在西昌彝族群体中,共检测到164个等位基因,频率范围0.0022~0.8004。经统计学检验,两个少数民族群体基因频率分布均符合Hardy-Weinberg平衡定律(P>0.05),经Bonferroni校正后,不存在连锁不平衡的基因座。在北川羌族群体中,男性个体识别能力(PDM)和女性个体识别能力(PDF)分别是0.999999999945624、0.99999999999999999322,二联体和三联体累积平均排除概率分别是0.999999591813975、0.999999999465296;在西昌彝族群体中,男性个体识别能力(PDM)和女性个体识别能力(PDF)分别为0.999999999873529、1;二联体和三联体累积平均排除概率分别是0.999999284224924、0.999999998931424。结论:Microreader TM 19X ID荧光检测试剂盒在北川羌族和西昌彝族人群中总体多态性较高,鉴别能力较好,可作为亲权关系和个体识别有力的补充和验证手段。
