In the Mountain''''s Shadow: Japan''''s Silk Reelers Blazed an Asian Path of Economic Development

1 Introduction: A Dissonant Fragment On entering Chichibu, many visitors feel as if they were passing through a time warp into another country or a bygone era as the train leaves behind Tokyo抯crowded suburbs and winds through steep slopes forested with oaks, beeches and cedars. The Oku Chichibu highlands, however, are a mere 70 kilometers northwest of Tokyo, or about 50 minutes by rail, less than the average two-hour of daily commute of 搒alarymen?within metropolitan area. The sense of s…     

早期中子星和夸克物质

夸克禁闭的解除与夸克物质的存在一直是物理学家极感兴趣的问题。尽管理论上已指出在超高温或超高密的条件下可以有夸克物质存在,但是由于地面实验室的条件所限,目前还不能通过实验证实这一点.宇宙中被观测到的中子星(例如crab和Vela脉冲星)的中心密度大于4倍的核物质密度,其中心温度也可以达到10~8—10~9K,于是人们希     

数字化形变观测干扰识别

收集整理了山东省数字化形变台自观测以来的固体潮分钟值资料，论述了气压、雷电、洞室进入、仪器故障及附加载荷等干扰因素对数字化形变高频记录的影响及其机理，为利用数字化资料及时识别干扰、准确捕捉短临地震异常提供了可借鉴的实例。     

Petrogenesis and tectonic implications of the Triassic rhyolites in the East Kunlun Orogenic Belt,northern Tibetan Plateau

The East Kunlun Orogenic Belt(EKOB),which is in the northern part of the Greater Tibetan Plateau,contains voluminous Late Triassic intermediate-felsic volcanic rocks.In the east end of the EKOB,we identified highly differentiated peralkaline-like Xiangride rhyolites(～209 Ma)that differ from the wide-spread andesitic-rhyolitic Elashan volcanics(～232-225 Ma)in terms of their field occurrences and min-eral assemblages.The older,more common calc-alkaline felsic Elashan volcanics may have originated from partial melting of the underthrust Paleo-Tethys oceanic crust under amphibolite facies conditions associated with continental collision.The felsic Elashan volcanics and syn-collisional granitoids of the EKOB are different products of the same magmatic event related to continental collision.The Xiangride rhyolites are characterized by elevated abundances of high field strength elements,especially the very high Nb and Ta contents,the very low Ba,Sr,Eu,P,and Ti contents;and the variably high 87Sr/86Sr ratios(up to 0.96),exhibiting remarkable similarities to the characteristic peralkaline rhyolites.The primitive magmas parental to the Xiangride rhyolites were most likely alkali basaltic magmas that underwent pro-tracted fractional crystallization with continental crust contamination.The rock associations from the early granitoids and calc-alkaline volcanic rocks to the late alkaline basaltic dikes and peralkaline-like rhyolites in the Triassic provide important information about the tectonic evolution of the EKOB from syn-collisional to post-collisional.We infer that the transition from collisional compression to post-collisional extension occurred at about 220 Ma.     

Modelling three-dimensional stress-dependent failure of hard rocks

Acta Geotechnica - Hard rocks exhibit three-dimensional (3D) stress-dependent failure under true triaxial compression. The deformability and strength of hard rocks under true triaxial compression...     

历史文化商业街经营者的地方感研究——基于黄山市屯溪老街案例

历史文化商业街若能凸显地方性特征将更具吸引力,经营者的地方感不仅是商业街地方性水平的重要标志,更是地方性建构的主体基础。对屯溪老街经营者地方感进行了实地调研,初步探讨了经营者地方感的形成机制,并为历史文化商业街的优化发展提出了建议。研究结果表明:经营者地方感不仅受到地方文化景观和经营活动绩效的影响,更与经营者同游客的互动交流相关,而这也将影响到历史文化商业街的吸引力。老街商业开发的模糊定位一定程度上削弱了其地方性,但丰富的历史文化景观以及经营者与游客的频繁互动,则有助于增进经营者地方感。由此,历史文化商业街的发展不仅要重视保护特色文化景观,更要优化商业活动品质,促进经营者与游客的互动,这是增进经营者地方感和商业街吸引力的基本保障。     

A principal component analysis of the equivalent widths of spectral lines of star clusters

Using principal component analysis, we have studied the equivalent widths of optical spectral lines of 41 Galactic globular clusters and 22 young stellar clusters. We have discovered that some characteristic spectral lines, such as the CN, Ca IIK, Ca IIH and MgI+MgII lines, are rather sensitive to metallicity. We have also found some lines that may be used as indicators of age, e.g. Hδ, Hγ, Hβ and H. These lines can help us to disentangle the coupling effects of age and metallicity in the clusters.     

中国儿童游憩需求与供给的空间分异及影响因素

使用统计数据和游客生成数据,从公共性和商业性视角评估中国城市儿童游憩供需空间分异,并使用逐步回归与地理加权回归识别影响因素。研究发现：① 中国城市儿童游憩需求和供给呈现胡焕庸线以东高、以西低,需求以首府城市为中心极,供给则以直辖市和旅游城市为中心极;② 中部内陆腹地供给匮乏、西部与东部沿海供给充足,胡焕庸线以东省会城市最匮乏;③ 中心城市高需求引致儿童游憩供给的集聚、虹吸效应,加剧游憩机会的不平等;④ GDP、城镇居民人均可支配收入、高级景区数量、第三产业占比、旅游人次和城镇化率是形成儿童游憩供给空间差异的主要因素。     

江西省应对气候变化政策

为应对全球气候变化,各级政府纷纷提出应对气候变化的战略和政策。以江西气候变化和影响事实为基础,分析和总结了目前江西省应对气候变化所采取的政策,包括农业政策、林业政策、水资源管理政策及防灾减灾政策等,得出了政府是应对气候变化的领导者、组织者和政策的制定者的结论,认为政府在应对气候变化行动中具有重要的引导作用。     

黔西南一次中β尺度强对流天气分析

2020年5月2日,黔西南出现中β尺度的强对流天气,安龙钱相出现42m/s灾害性大风,最大冰雹直径普安罗汉25mm,最大小时雨强册亨站66mm/h。对常规地面观测资料、高空观测资料、多普勒天气雷达资料以及NOAA的HYSPLIT模式同期驱动资料等分析,结果表明：(1)本次过程主要受高空槽、中低层切变线、地面辐合线、云南热低压等系统共同影响;(2)大气不稳定层结明显,零度层高度和-20℃层高度利于降雹,0-6km垂直风切变和干暖盖指数利于大风,水汽条件好利于短时强降水,后向轨迹模式HYSPLIT模拟出四条兴仁站水汽输送路径：本地、西、西南、东北路径;(3)过程中卫星红外云图上为椭圆形雹暴云团发展移动,TBB中心低于-60℃,对流云顶伸展较高;(4)三条回波路径均为西北-东南方向;大冰雹发生时,雷达回波呈现“钩状”、三体散射长钉、回波悬垂、风暴顶强辐散、垂直液态含水量跃增、高回波顶高等特征;短时强降水发生时,存在回波质心低、低层强烈径向辐合、雷达产品雨强大等特点;(5)安龙钱相发生42m/s灾害性大风时,65dBz反射率因子核位于6km,回波梯度大,反射率因子核迅速下降,存在侧向入流槽口、径向正负速度对、深厚中层径向辐合、风暴顶强烈辐散、明显旋转等特征,正速度模糊达35m/s;特殊地形的“狭管效应”对产生本次灾害性大风有增幅作用。