元白咏物诗的题材特点     

王琴 《广东海洋大学学报》2011,31(2):52-57

咏物诗发展到唐代,题材不断扩展,元稹、白居易是其中有意识地拓展咏物诗题材的重要诗人。元白咏物诗分为咏动物、植物、器物、建筑、天文、地理、食物等8类,题材延伸到生活的各个领域,突出特点是拓展了对私人空间的描摹,对时政领域的抒写,形式方面也有突破,采用了寓言诗、一诗咏二物、组诗等表现手法。元稹、白居易在咏物诗的题材开拓上做出了贡献。  相似文献   

The movement features analysis of Laohugou Glacier No. 12 in Qilian Mountains   总被引：1，自引：0，他引：1  

YuShuo Liu  Xiang Qin  WenTao Du  WeiJun Sun  DianJiong Hou 《寒旱区科学》2011,3(2):0119-0123

The Laohugou Glacier No. 12 is the largest valley glacier in Qilian Mountains, which is located in northern Qinghai-Tibet Plateau. Movement is the basic characteristic of glaciers, and is also an important distinction from other terrestrial natural ice. Glacier changes not only reflect climate change, but also play an important role in humanity society. In the arid regions of western China, glaciers are becoming an important water source. We use the GPS receiver (South-Lingrui S82) as data platform with the aid of RTK measurement technology to observe the surface velocity of Laohugou Glacier No. 12. Surface velocity data shows that the maximum value appears at an altitude of 4,750–4,850 m during the period of 2008–2009. During this period, the west branch surface velocity reached 32.6 m per year at an altitude near 4,830 m, the east branch surface velocity reached 32.4 m per year at the altitude near 4,770 m. Comparing the surface velocity data during 2008–2009 with observation results in 1959, the glacier velocity slowed down about 11%.  相似文献   

Sustainable yield of a karst aquifer system: a case study of Jinan springs in northern China   总被引：1，自引：0，他引：1  

Fengxin Kang  Menggui Jin  Pinrui Qin 《Hydrogeology Journal》2011,19(4):851-863

Based on the long-term monitoring data of rainfall, groundwater levels, groundwater abstraction, spring flow rates and groundwater quality, an assessment has been undertaken of the sustainable yield of a karst aquifer system in Shandong Province, northern China, to maintain perennial outflow of the karst springs while meeting water demands. One of the fundamental indicators for sustainable yield of groundwater is identified as maximum allowable water-level drawdown. A regional three-dimensional finite-difference numerical model has been developed to optimize the schemes associated with well fields and their locations and sustainable yields, in the Jinan spring catchment and its adjacent karst groundwater catchments, with the aim of maintaining the water level higher than the allowable lowest water level of 27.5?m above sea level. Furthermore, measures necessary to move towards sustainable use of the karst groundwater are outlined, drawing on contingency plans of water-source replacement and artificial recharge, dual water supply (based in water quality), use of the spring waters themselves, and groundwater quality protection.  相似文献   

页岩气开发水力压裂技术综述   总被引：16，自引：0，他引：16  

唐颖  唐玄  王广源  张琴 《地质通报》2011,30(2)

世界页岩气资源丰富,但由于页岩地层渗透率很低,目前还没有广泛开发.水力压裂技术是页岩气开发的核心技术之一,广泛用于页岩储层的改造.介绍了水力压裂作业的压裂设计、裂缝监测、压裂液配制和添加剂选择,以及常用的压裂技术,包括多级压裂、清水压裂、同步压裂、水力喷射压裂和重复压裂.结合国外页岩气开发的实例和国内压裂技术的应用情况,分析了各种压裂技术的适用性.研究认为,清水压裂是现阶段中国页岩气开发储层改造的适用技术,开采长度(厚度)大的页岩气井,可以使用多级分段清水压裂技术.同步压裂技术是规模化的页岩气开发的客观需要.  相似文献   

徐沛煤田晚古生代成煤环境与聚煤规律研究     

廖家隆  袁振丽  王慧军  刘茜清  韩鹏 《中国煤炭地质》2011,(11):1-5

根据已有研究成果及大量钻孔资料,运用沉积学、煤田地质学的基本理论和方法,分析了徐沛煤田晚古生代的成煤环境,并总结了其聚煤规律及控制因素。结果表明,石炭—二叠纪聚煤作用主要发生在海岸带的堡岛体系和过渡相中,由海岸带向两侧,聚煤条件逐渐变差;堡岛体系泥炭坪形成的煤层厚度小,结构单一;三角洲体系分流间湾泥炭坪和泛滥平原泥炭沼泽形成的煤层厚度大;煤层在垂向上由薄至厚,结构由简单至复杂,稳定性逐渐变差;平面上,自北而南含煤层数逐渐增多,含煤层位逐渐抬高,条带状富煤带有向南迁移趋势。  相似文献   

An application of a new method in permafrost environment assessment of Muli mining area in Qinghai-Tibet Plateau,China   总被引：3，自引：2，他引：1  

Wei Cao  Yu Sheng  Yinghong Qin  Jing Li  Jichun Wu 《Environmental Earth Sciences》2011,63(3):609-616

The permafrost environment in the Muli mining area, an opencast mining site in the Qinghai-Tibet Plateau, China, is now undergoing significant degradation because of the ongoing mining activities. The permafrost environment in this mining site had already been evaluated by previous study, in which analytic hierarchy process was applied. Although this method can roughly characterize the permafrost environment of this mining site, it has limitations by being easily affected by man-made factors. In view of this limitation, this study attempts to employ a new method, the catastrophe progression method, to estimate the current stage of the permafrost environment in this mining area. The results show that, by catastrophe progression method, currently the calculated indexes of the permafrost freezing–thawing disintegration, permafrost thermal stability, permafrost ecological fragility, and the permafrost environment are 0.43 (general situation), 0.77 (general situation), 0.71 (bad situation) and 0.83 (general situation), respectively. These values imply that the permafrost environment has been damaged by anthropologic activities to a certain degree and potentially may be further degenerated. However, at this degree, a new equilibrium stage of permafrost environment could be achieved if the current state of environmental degradation is stabilized and treatments are constructed against further damages.  相似文献   

土壤碳循环研究进展及干旱区土壤碳循环研究展望   总被引：5，自引：1，他引：4  

许文强  陈曦  罗格平  蔺卿 《干旱区地理》2011,(4)

土壤碳库动态及其驱动机制是陆地生态系统碳循环与全球变化研究的热点问题之一。随着各国对《京都议定书》的重视,农业土壤碳库变化及其源汇效应研究不断加强,但以往研究土壤碳循环主要是针对有机碳,较少考虑无机碳的作用和地位,干旱区土壤无机碳储量巨大,其在区域碳循环过程中的贡献日益显著,这使得干旱区土壤碳循环研究必须同时考虑土壤有机碳和无机碳的行为。国内外关于农业土壤有机碳动态的研究主要围绕农业土壤有机碳储量、固碳潜力等问题展开,研究区多为湿润、半湿润地区;国际上对农业土壤无机碳动态的研究主要集中在干旱区土地管理措施对土壤发生性碳酸盐碳的形成与转化方面,研究方法以稳定同位素技术为主,但目前关于中国干旱区农业土壤无机碳动态的研究还较为薄弱。因此,应加强干旱区绿洲土壤碳循环研究,深入分析干旱区绿洲土壤碳的源/汇效应;探讨土壤无机碳动态变化的机理。  相似文献   

新疆“百里、三十里风区”铁路沿线设计风速研究     

李红军  赵勇  霍文  何清  葛盛昌 《干旱区地理》2011,34(6):941-948

为使通过新疆“百里、三十里风区”的铁路抗风达到既安全又经济的目标,使用风区内气象站和铁路测风站风资料分析了风速风向的分布规律和两种站之间风速相关关系,采用极值Ⅰ型分布推算确定了铁路沿线合理的设计风速.研究表明:十三间房和达坂城是两风区平均风速和最大风速的最大站,年平均风速分别为5.4 m/s和6.1 m/s,10 mi...  相似文献   

Storm流式技术在地面气象数据处理中的应用          下载免费PDF全文

廖婷婷  王彪  肖卫青  李从英  郭茜 《中低纬山地气象》2019,43(5)

地面自动站气象数据的量级、观测传输频次日益增长,传输方式从传统的文本方式发展到消息传输,对数据处理时效有了更高的要求。该文提出采用Storm流式技术进行地面自动站气象数据的解码和入库,使用Spout节点连接外部数据源,将数据转化为Tuple,传递给解码Bolt、入库Bolt和DI/EI消息Bolt,分别进行实时的入库和监控,且达到灵活调整系统资源的目的。该应用与传统的简约流程对比,稳定性、处理效率、拓展性都有了显著提高。  相似文献   

卫星在热带气旋快速增强观测中的应用进展          下载免费PDF全文

张淼  邱红  覃丹宇  寿亦宣 《气象与减灾研究》2021,44(2):81-86

热带气旋(TC)快速增强(RI)对我国影响大且预报难度较大,在常规观测资料稀少的海洋上,卫星探测技术的发展,提供了更多的RI TC内部结构变化的有效信息,能够帮助人们进一步认识TC强度的变化规律.文中总结了静止轨道及极地轨道卫星上搭载的可见/红外扫描仪、微波成像仪、降水测量雷达、风场测量仪器、闪电成像仪和云雷达资料在TC RI中的应用以及存在的问题,指出发展小卫星星座及静止轨道微波探测,加强RI TC内部的降水、云微物理和风场等重要信息的时间演变分析,并结合数值模拟进一步研究TC RI的物理机制将是未来的发展方向.  相似文献