Simulation of morphological development of soil cracks in Yuanmou Dry-hot Valley region,Southwest China

Soil cracking is an important process influencing water and solutes transport in the Yuanmou Dry-hot Valley region of Southwest China. Studying the morphological development of soil cracks helps to further reveal the close relationship between the soil cracking process and water movement in such semi-arid regions. Here we report regular changes on surface morphology of soil cracks with decreasing water in four different soils (Typ-Ustic Ferrisols,Ver-Ustic Ferrisols,Tru-Ustic Vertisols and Typ-Ustic Vertiso...     

Blazar天体的辐射特性研究

收集了47个Blazar天体的短时标光变资料,估算了中心天体质量和不同波段辐射区域,并对估算结果作了统计分析,发现Blazar天体中心黑洞质量在10~7M_☉到10~(10)M_☉之间,BL Lac天体与平谱射电类星体中心黑洞质量有很大差异,平谱射电类星体中心黑洞质量大于BL Lac天体中心黑洞质量;红外波段和γ射线波段辐射区域大小相似.同时,利用收集到Blazar天体的热光度分析了Blazar天体热光度与短时标光变之间的关系,证实了射电选BL Lac(RBL)天体和平谱射电类星体(FSRQs)的辐射是强成束的,但相对论聚柬效应对X射线选BL Lac(XBL)天体的辐射影响较小.     

AO 0235+164射电波段宽带谱指数周期性变化的研究

收集了AO 0235+164天体射电4.8 GHz和14.5 GHz波段的光变测量数据,并获得了长期的光变曲线,从光变曲线可以看出其活动是非常剧烈的。利用Jurkevich方法和自相关函数方法分别对AO 0235+164射电波段宽带谱指数进行周期性分析,并对流量和谱指数进行相关性分析,研究结果表明:(1)AO 0235+164天体射电波段4.8 GHz～14.5 GHz对应的宽带谱指数,可能存在5.30年的光变周期,与Liu等人用功率谱法在射电波段发现其流量密度可能存在5.59±0.47年的光变周期基本吻合;(2)宽带谱指数与流量密度之间存在相关性。     

丽江观测站1.8米望远镜自适应光学系统性能初步理论估计

为了探讨丽江1.8 m自适应光学望远镜在天文或天体物理研究领域的可能应用,使用误差基本标度理论对其性能进行了初步的理论分析。结果表明,一般观测条件下,系统分辨力可以达到近似衍射极限。同时对在其上配置激光导星系统后可获得的性能进行了预测,结果表明,激光导星自适应光学系统将大幅度提高系统的天空覆盖率。     

Broad line and multi-wave luminosity relations in Fermi FSRQs

We study broad line and multi-wave luminosity relations for 80 flat-spectrum radio quasars (FSRQs) detected by Fermi LAT. Our results are as follows: for FSRQs, the correlations between logL _γ and logL _BLR, between logL _X and logL _BLR, between logL _O and logL _BLR, between logL _R and logL _BLR are significant; the correlation between logL _IR and logL _BLR (P=0.08) is not significant, but might be refereed as a “trend” of significant correlation. These results support a close link between jet formation and accretion disk, and the L _γ -L _BLR correlation suggests that the radiation mechanism of the γ-ray emission in FSRQs is likely to be inverse Compton scattering of seed photons from BLR or outflowing BLR.     

Correlation between X-ray and γ-ray for Fermi blazars

Using γ-ray band data detected by Fermi Large Area Telescope (LAT) and X-ray band data for 78 blazars, we find a medium correlation between X-ray flux and γ-ray flux in all states. A medium correlation is also found between X-ray (1 keV) mean spectral index α _x and γ-ray mean spectral index α _γ for BL Lacertae objects (BL Lacs), and there is no correlation for Flat Spectrum Radio Quasars (FSRQs). From these results, we suggest that the most likely radiation mechanism for the high energy gamma-rays would be synchrotron self-Compton (SSC), and that the gamma-ray emission mechanism may be somewhat different for BL Lacs and FSRQs.     

雷电临近预警系统的运行试验

介绍了中国气象科学研究院研发的雷电临近预警系统(CAMSLNWS)在北京地区开展的业务运行试验.通过运行测试以及预警结果与闪电监测结果的对比评估,表明:CAMS.LNWS能够稳定运行,定时读取多种探测资料、自动生成并循环显示雷电发生概率、雷电活动区域移动趋势和重点区域雷电危险度等级三种雷电临近预警产品;CAMS.LNWS的雷电发生概率预警产品具有较高的命中率,能够较好地对0～30min内可能发生闪电的区域进行有效预警;随着预警时间的延长,CAMS.LNWS的预警效果会有所降低.     

气候政策核心要素的演化及多目标的协同

分析了气候政策中减缓和适应的差异性和协同性,回顾了气候政策的核心要素（减缓和适应）的演化及其与可持续发展政策的密切关系,指出目前气候政策中多要素协同的重要性。强调应该特别关注气候政策的实施性,应将其纳入国家和部门的规划和政策中。最后提出了气候政策中多目标协同需关注的三方面问题：如何确定气候政策的各目标;为保证多目标协同的实施,如何提升相应的能力;现有的资金管理机制如何更好地与部门投资结合。     

中国大陆地壳运动的背景场

利用中国大陆和周围地区的12个IGS站近3年（1995年5月-1998年3月）的GPS观测资料,确定了这些IGS站的水平位移速率,并用其研究中国大陆地壳构造运动的背景,得到了具有重要意义的推论。