光学微盘腔与三能级量子点系统中的模耦合研究

用一种全量子理论方法研究了波导、光学微盘腔与三能级量子点耦合系统的动力学过程,求出其耦合后的透射模和反射模的解析解. 由于微腔表面粗糙引起反向散射,在微腔内形成两简并回音壁耦合共振模,其耦合率为β;量子点的两激发态分别以耦合率g₁,g₂与回音壁耦合共振模产生耦合. 在实数空间里,得出透射光谱和反射光谱的数值解,这些三能级模型结果比二能级模型结果更接近真实光学微盘腔系统,能更好地显示耦合系统的动力学特性.     

21世纪中国主要粮食产区的空间格局特征

Grain production is an important issue for the national economy and the livelihood of the Chinese people. It serves as the foundation of national development and social stability. China is a major grain producer as well as a major grain consumer. The grai…     

Pattern of abrupt climatic fluctuation in the East Asian Monsoon during the Last Glacial: Evidence from Chinese loess records

Records of two loess sections located in mid-eastern and western margins of the East Asian Monsoon area captured 20 Dansgaard-Oescher events and six Heinrich events. All these suggested that the climate in the East Asian Monsoon area fluctuated rapidly on millennial to century timescales during the whole Last Glacial. We found that these loess-based events of rapid climate fluctuations were generally synchronous with those of GRIP records, but that there were differences between the Shagou loess section in the west and the Wangguan loess section in the east: the former was more sensitive to climate change than the latter. Compared with earlier studies on loess records covering the Last Glacial from neighboring areas, we discovered that the magnitude of Dansgaard-Oeschger cycles decreased gradually from west to east and we suggest that it resulted from the combined effect of the Westerlies and the East Asian Monsoon.     

西湖凹陷输导体系特征及其对油气成藏的控制作用

输导体系是东海西湖凹陷油气勘探研究中的重要内容之一。断裂、砂岩层和不整合面作为西湖凹陷输导体系的基本要素,共同构成了盆地各成藏单元流体纵、横向运移的复杂输导网络系统。根据断裂、砂岩层、不整合面等输导要素在空间和时间上的组合关系,总结出顺向断层阶梯型、反转断层丘型、调节断层"Y"型和"T"型4种典型输导体系样式。输导体系对油气成藏的控制作用主要表现为:输导体系类型及分布样式决定着油气藏层位的分布;输导体系组成地质要素控制着油气藏类型的分布。     

新型氢化物发生技术--可移动还原床氢化物发生器Ⅰ.可移动还原床氢化物发生器的结构及特征

发展了一种新型的氢化物发生技术--可移动还原床氢化物发生器,可以实现微升级样品的分析而不需要对样品进行酸化和使用气-液分离器.给出了装置的结构、操作,试验并优化了固体还原剂与有机酸的质量配比、反应腔体体积、进样量等反应条件.该技术易于实现自动化,可作为液相色谱、毛细管电泳和其他色谱分离技术与光谱检测技术之间的接口.     

Observations of Coronal Mass Ejections with the Coronal Multichannel Polarimeter

The Coronal Multichannel Polarimeter (CoMP) measures not only the polarization of coronal emission, but also the full radiance profiles of coronal emission lines. For the first time, CoMP observations provide high-cadence image sequences of the coronal line intensity, Doppler shift, and line width simultaneously over a large field of view. By studying the Doppler shift and line width we may explore more of the physical processes of the initiation and propagation of coronal mass ejections (CMEs). Here we identify a list of CMEs observed by CoMP and present the first results of these observations. Our preliminary analysis shows that CMEs are usually associated with greatly increased Doppler shift and enhanced line width. These new observations provide not only valuable information to constrain CME models and probe various processes during the initial propagation of CMEs in the low corona, but also offer a possible cost-effective and low-risk means of space-weather monitoring.     

热惯量法在监测土壤表层水分变化中的研究

利用遥感方法监测一定层水深土壤水分变化，关键是建立卫星数据与地表水热变化关系，该文地遥感定量反演土壤水热变化的数值模拟系统及热惯量在其边界，初始条件确定中所起的作用进行的简述，并介绍了热惯量法求解表层水分含量的发展概况，为进一步提高定量化监测方法的地必琢计算精度，该文发展了地表能量平均方程的一种新的化简方法，经过这样的处理，可从遥感图象数据直接得到真实热惯量值，进而得到土壤水分含量分布，通过野外实     

相空间反演方法在表层水温预报中的应用

利用相空间理论及方法对渤、黄、东海共4个站位近十几年的旬平均SST进行分析。结果表明：表层水温具有混饨特性，其吸引子关联维数平均约为1．23、嵌入相空间维数为6（渤、黄海）和7（东海178号站位）、二阶Renyi熵平均约为3．7×10-4（1／d）及平均可预报时间尺度平均为27个点；基于以上分析结果运用相空间反演方法建立了旬平均SST的反演模型，并且在试预报的前5旬的最大相对误差约为4．2％。     

广东新丰江水库XFJ-1孔DDTs和HCHs的沉积记录

以~(210)Pb对广东新丰江水库XFJ-1孔进行了定年,以GC-ECD测定新丰江水库沉积钻孔中DDTs和HCHs的含量,通过对比其剖面变化特征与该类农药在我国的生产、使用历史,探讨了水库中DDT、HCH的历史输入途径.过去30年来,XFJ-1孔平均沉积速率为1.42cm/a,沉积物中HCHs和DDTs的含量分别为1.26-3.90ng/g和1.00-3.96ng/g.DDTs、HCHs含量从20世纪80年代初逐渐下降,总体上与我国1983年开始禁止DDT、HCH的大规模生产和使用这一历史事件相符.DDTs、HCHs及其化合物比值的剖面变化特征均表明:流域内后期土壤侵蚀、搬运的再循环污染物质(即二次污染源)对水库DDT和HCH的贡献不明显;相反,农药历史使用(即一次污染源)是其主要来源,大气沉降是其主要输入途径.此外,γ-HCH、o,p′-DDT和p,p′-DDT含量的垂直变化表明,大规模禁用以后这些化合物仍有少量新的输入,需引起重视.     

Study on the Global Carbon Assimilation System Based on Multisource Remote Sensing Data

The Paris agreement signed in April, 2016 aims to balance global anthropogenic carbon emissions and terrestrial carbon sinks by the middle of the 21^st century. To fulfill this goal, it is necessary to calculate carbon fluxes of different regions reliably. The global carbon assimilation system is an effective technique for achieving this goal. The Ministry of Science and Technology of China supports the project entitled as study on the global carbon assimilation system based on multisource remote sensing data through the national key research and development programs for global change and adaptation during the thirteen-five period. This project will develop synergic inversion techniques for retrieving key parameters of biological and atmospheric cycles and for assimilating multisource remote sensing and ground based data. Then, the high resolution global carbon assimilation system coupled with an ecological model will be constructed. This system is able to assimilate jointly multisource observation data and to optimize key model parameters, photosynthesis and respiration carbon fluxes of global terrestrial ecosystems, and anthropogenic carbon emission fluxes of key regions. This system will be used to study quantitatively the spatial and temporal patterns of carbon fluxes of global terrestrial ecosystems and anthropogenic carbon emission fluxes of key regions and to identify the mechanisms driving the global terrestrial carbon sinks and sources. The outputs of this study will be helpful for the fulfillment of the key research and development programs for global change and adaptation and provide valuable data and technical support for the decision-making in China.