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载人航天与运载火箭——访运载火箭技术专家王德臣 被引量:2
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作者 杨启东 谢建玲 孙雅平 《导弹与航天运载技术》 2000年第1期4-6,共3页
载人航天技术是当今规模最大、技术最复杂的航天技术,是一个国家取得航天领先地位的重要标志,在中国以前,只有美、俄已掌握了载人航天技术。1999 年11 月20 日~21 日,中国新型运载火箭发射载人航天试验飞船的成功和神舟... 载人航天技术是当今规模最大、技术最复杂的航天技术,是一个国家取得航天领先地位的重要标志,在中国以前,只有美、俄已掌握了载人航天技术。1999 年11 月20 日~21 日,中国新型运载火箭发射载人航天试验飞船的成功和神舟号飞船返回舱安全返回,标志着中国在载人航天工程上迈出了重要的一步。喜讯传来,每一个中国公民无不欢欣鼓舞,对载人航天以及中国载人航天活动中的新型运载火箭也更加关注。 展开更多
关键词 载人航天 运载火箭 空间资源探测 中国
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The Spatial Differences and Influencing Factors of Tourism Resources in Ningxia,China 被引量:1
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作者 ZHANG Shengrui CHI Lei +2 位作者 ZHU He ZHANG Tongyan JU Hongrun 《Journal of Resources and Ecology》 CSCD 2024年第4期1068-1082,共15页
The analysis of the spatial distribution of tourism resources and the identification of its influencing factors are crucial for supporting the sustainable development of regional tourism.This study established a compr... The analysis of the spatial distribution of tourism resources and the identification of its influencing factors are crucial for supporting the sustainable development of regional tourism.This study established a comprehensive database of tourism resources in Ningxia Hui Autonomous Region(Ningxia)through a combination of literature review and field research.It examined the quantitative,qualitative,and categorical characteristics of tourism resources in Ningxia,and determined the spatial patterns based on kernel density and spatial association analysis.This study also comprehensively evaluated the societal,economic,and environmental factors influencing the spatial distribution of tourism resources in the entire region by employing the geographical detector model to quantify the influence of each factor.The following results were obtained.(1)There were 29218 individual tourism resources in Ningxia,comprising eight main types,23 subtypes,and 105 fundamental types,and they exhibit a hierarchical pyramidal structure.(2)The tourism resources in Ningxia displayed characteristics of“widespread regional dispersion and limited regional agglomeration”.The spatial distribution of tourism resources was highly imbalanced,and most types of tourism resources exhibit strong positive spatial correlation.(3)The altitude,annual precipitation,population density,distance from urban centers,urbanization rate,and per capita GDP were identified as significant factors influencing the spatial distribution of tourism resources in Ningxia.Based on the results,we recommend that the government should formulate tourism development policies in Ningxia based on local conditions to effectively address the spatial imbalances,enhance the sustainability of tourism development,and continue to promote high-quality tourism development in Ningxia. 展开更多
关键词 tourism resource spatial pattern influencing factors Geo-detector Ningxia
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