The influence of agriculture in the process of population integration and cultural interaction during the Eastern Zhou Period in central-south,Inner Mongolia: Carbon and nitrogen stable isotope analysis of human bones from the Dabaoshan cemetery,Helingeer County     

XinYu Zhang  Xu Zhang  MingJie Suo  Dong Wei  YaoWu Hu 《中国科学:地球科学(英文版)》2018,61(2):205-214

Central-south Inner Mongolia, China, is highly sensitive to the cultural interactions between sedentary agriculturalists and nomadic pastoralists during the Eastern Zhou Period (770–256 BC). The previous pattern of multiple cultures and diverse ethnic groups has been transformed to the increasingly dominated cultural system of Central Plain since the middle and late Warring States Period, when the states of Zhao and Qin have conquered the most parts of central-south Inner Mongolia. However, the variation of subsistence strategies during this historical process has never been evaluated. Particularly, as the typical representative of Central Plain cultures, the effect of intensive millet agriculture is still unknown in the process of population integration and culture interaction. Thus, to explore the shift of subsistence pattern, carbon and nitrogen stable isotope analysis of bone collagen from Dabaoshan site (410–180 BC) have been performed. The isotopic result indicates a large amount of C4-based animal protein consumed by Dabaoshan humans. According to the archaeological backgrounds, we propose the Dabaoshan persons intensively relied on the millet agriculture and developed the agro-pastoral economy, which hinted the comprehensive influences from Central plain civilizations in late Warring States Period. Further compared with other published isotopic data in the same region during different periods, we suggest the millet agriculture has played the positive role in the process of population integration and culture fusion in central-south Inner Mongolia during the Eastern Zhou Period.  相似文献   

滇西北地区高山湖泊沃迪错近两百年来环境变化及枝角类群落响应     

李静  陈光杰  黄林培  孔令阳  索旗  王旭  朱云  张涛  王露 《湖泊科学》2023,35(6):2170-2184

区域增温和大气氮沉降作用已成为高山湖泊面临的重要环境胁迫,已有高山湖泊生物群落响应的长期模式研究主要集中于藻类而缺乏更高营养级生物(如浮游动物)的系统调查。本研究选择滇西北地区深水型的高山湖泊沃迪错开展沉积物调查,通过多指标分析(总氮、总磷、叶绿素a、氮稳定同位素等)并结合区域气候重建记录,识别近两百年来该湖泊及流域环境的变化历史,进一步利用枝角类群落指标(物种组成、生物量等)定量评价了湖泊生物群落的响应模式与驱动因子。结果表明,湖泊营养水平(如总氮浓度)和初级生产力(叶绿素a浓度等)在过去近两百年总体呈上升趋势。相关分析显示,大气氮沉降和流域外源输入是影响总氮上升的主要因素,同时区域增温和营养盐富集促进了湖泊初级生产力的不断上升。自1960s以来区域升温明显,湖泊营养水平和叶绿素a浓度呈现加速上升的趋势。钻孔中枝角类群落以浮游属种(Daphnia longispina等)为优势种,在1900AD以前D.longispina相对丰度较为稳定(40.83%±8.02%),之后出现下降趋势且在1948—1965年间明显下降,之后再次明显上升并成为主要优势种。排序分析显示,气温、叶绿素a和总...  相似文献   

Changes in Shale Rock Properties and Wave Velocity Anisotropy Induced by Increasing Temperature     

Suo  Yu  Chen  Zhixi  Rahman  Sheikh S. 《Natural Resources Research》2020,29(6):4073-4083

Natural Resources Research - Water saturation, organic matter content, and fractures are important factors influencing the physical properties of shale. In this study, shale samples were subjected...  相似文献   

Superpenumbral chromospheric flare     

Suo Liu  Hong-Qi Zhang  Debiprasad P.Choudhary  Abhishek K.Srivastava  Bhola Nath Dwivedi 《天文和天体物理学研究(英文版)》2018,(10)

We observed a C-class flare at the outer boundary of the superpenumbra of a sunspot. The flare was triggered by an emerging magnetic bipolar region that was obliquely oriented with respect to the superpenumbral fibrils. The flare started due to the low height magnetic reconnection of emerging magnetic flux with a superpenumbral field resulting in hot multi-temperature plasma flows in the inverse Evershed flow channel and its overlying atmosphere. Inverse Evershed flows in the chromosphere start from the superpenumbra towards the sunspot that end at the outer boundary of the penumbra. The hot plasma flow towards the sunspot in the inverse Evershed channels show about 10 km s~(-1) higher velocity in Hα wavelengths compared to the plasma emissions at various temperatures as seen in different AIA filters. Even though these velocities are about seven times higher than the typical inverse Evershed flow speeds, the flow is diminished at the outer boundary of the sunspot's penumbra. This suggests that the superpenumbral field lines that carry inverse Evershed flows are discontinued at the boundary where the penumbral field lines dive into the sun and these two sets of field lines are completely distinct. The discontinuity in the typical magnetic field and plasma properties at the adjoining of these two sets of field lines further leads to discontinuity in the characteristic magnetoacoustic and Alfv′en speeds, thereby stopping the plasma flows further on. The multi-temperature plasma in the inverse Evershed channels exhibits possible longitudinal oscillations initially during the onset of the flare, and later flows towards the sunspot. In the multi-temperature view, the different layers above the flare region have a mixture of supersonic as well as subsonic flows.  相似文献   

大功率激电法在蒙古国沃克西铜矿勘查中的应用     

杨锁  高明山  时志兴 《西部资源》2013,(2):84-85,134

本文主要介绍了大功率激电法工作的原理和方法,并结合蒙古国沃克西铜矿13线的应用效果进行了证实分析和研究。中梯剖面图和测深拟断面图都能很好地显示低阻带的位置及产状,与已知的F5断裂吻合非常好。垂直于F5断裂方向出现高极化异常带,与已知的铜矿化很吻合,证实了大功率激电法工作的有效性,用该方法寻找同类矿床具有很好的效果。  相似文献   

遥感蚀变异常在地质矿产勘查工作中的应用   总被引：2，自引：0，他引：2  

王宝林  朱锁  丛丽娟  高秀花 《华南地质与矿产》2011,(1):64-68

阐述利用遥感数据提取蚀变异常的机理、方法、数据源及在不同找矿阶段的应用.以内蒙古西部阿拉善左旗沙拉西别地区为例,讨论了遥感找矿的预测应用;以内蒙古西部朱拉扎嘎金矿为例,讨论了遥感找矿在详查工作阶段的应用.通过研究认为,遥感蚀变异常可以为野外勘探前期的预测阶段提供重要的找矿信息,为详查阶段提供精确的定位信息.遥感技术是贯...  相似文献   

2013年四子王旗马铃薯生育期气象条件分析     

索慧  寿绍文  付志强  郑志峰  郭春宝 《内蒙古气象》2014,(2):31-35

文章从热量、水分、光照三个方面对四子王旗2013年马铃薯全生育期气象条件进行了分析、探讨和总结。结果表明,尽管有诸多不利因素,2013年四子王旗气象条件总体比较适宜马铃薯生长发育。  相似文献   

II型超新星瞬发爆炸模型的激波传播     

汪惟中  张锁春  王贻仁  谢佐恒 《中国天文和天体物理学报》1997,(1)

本文专门讨论II型超新星瞬发爆炸模型中的激波形成点、激波波阵面的位置、激波速度和激波能量等一系列的问题 .研究发现在外星核区除存在首级激波外 ,还存在次级激波 ;激波波阵面的准确位置应在熵变化的最大点和外星核区中人为粘性压的最大点之间 ;并给出激波能量的不同定义量之间的大小关系  相似文献   

Safety assessment of platform loadout procedures based on unascertained measures     

李彦苍  索娟娟 《中国海洋湖沼学报》2007,25(4):354-358

Safety assessment of offshore platforms is an urgent task. Such assessments are now focusing on the structure, maintenance, and retirement of a platform. Some methods employed have many shortcomings. For example, they cannot make the reliability adequately explicable. Therefore, a mathematical tool, the unascertained measure, was introduced. First, the basic knowledge of the unascertained sets was introduced briefly. Second, the unascertained measure was defined and credible identification was set up. The method has been introduced into the fields for safety assessment of a jacket loadout procedure. Engineering practices showed that it can complete the safety assessment systematically and scientifically without any assumption. The work should have significance in theory and practice for offshore engineering.  相似文献   

隧道开挖中围岩损伤演化分析及力学参数预测   总被引：1，自引：0，他引：1  

王唢  赵明阶  蒋树屏  易丽云  林志 《岩土力学》2009,30(Z1):195-200

数值方法所得出结论的可靠性很大程度上取决于岩体力学参数的选取,因此基于损伤演化分析,对损伤变量与围岩力学参数之间关系进行了研究。在各向同性损伤的假定下,通过分析开挖过程中围岩损伤演化,建立了采用损伤变量对弹性模量、泊松比、黏聚力、摩擦角等围岩材料参数进行估算的方法。采用弹性纵波波速定义初始损伤,根据壁城隧道现场监测资料建立ANSYS渐进性数值模型,反演典型断面开挖过程中围岩的宏观力学参数。分析结果表明,该方法可以有效地确定围岩力学参数的变化情况,与实际情况吻合较好。  相似文献