Color dependence of clustering properties of Luminous Red Galaxies (LRGs)

From the approximately volume-limited Luminous Red Galaxy (LRG) sample of the Sloan Digital Sky Survey Data Release 6 (SDSS DR6), we construct three LRG samples with different g-r color, which have the nearly same number density, to investigate the color dependence of clustering properties of LRGs. It is found that the blue galaxies have a more filamentary distribution than red galaxies, and that the bluest LRGs preferentially inhabit the dense groups and clusters. But in three LRG samples with different u-g color, we do not observe the tendency for clustering properties of LRGs to significantly change with color. We preferentially conclude that the clustering properties of LRGs are not strongly correlated with colors.     

基于伪距测量的钟差计算模型

基于伪距和钟差定义,讨论了无线电时间比对的基本原理。在此基础上,详细推导了地心非旋转坐标系中一般意义下基于伪码测距模式的钟差计算模型,并通过坐标变换,给出了地固系中的实用计算模型。对地回系计算模型的进一步分析表明：卫星在地固系运动速度引起的改正项与sagnac效应项是完全不同的两项改正;对于GEO卫星,sagnac效应项最大约为200ns,其地固系运动速度引起的改正约为1ns;而对于MEO卫星,sagnac效应项最大为120ns,其地固系运动速度引起的改正约为1200ns。     

Flare-induced signals in polarization measurements during the X2.6 flare on 2005 January 15

Flare-induced signals in polarization measurements which were manifested as apparent polarity reversal in magnetograms have been reported since 1981. We are motivated to further quantify the phenomenon by asking two questions: can we distinguish the flare-induced signals from real magnetic changes during flares, and what we can learn about flare energy release from the flare-induced signals? We select the X2.6 flare that occurred on 2005 January 15, for further study. The flare took place in NOAA active re-gion (AR) 10720 at approximately the central meridian, which makes the interpretation of the vector magnetograms less ambiguous. We have identified that flare-induced signals during this flare appeared in six zones. The zones are located within an average distance of 5 Mm from their weight center to the main magnetic neutral line, have an average size of (0.6±0.4)×1017 cm2, duration of 13±4 min, and flux density change of 181±125 G in the area of reversed polarity. The following new facts have been revealed by this study: (1) the flare-induced signal is also seen in the transverse magnetograms but with smaller magnitude, e.g., about 50 G; (2) the flare-induced signal mainly manifests itself as apparent polarity reversal, but the signal starts and ends as a weakening of flux density; (3) The flare-induced signals appear in phase with the peaks of hard X-ray emission as observed by the Ramaty High Energy Solar Spectroscopic lmager (RHESSI), and mostly trace the position of RHESSI hard X-ray footpoint sources. (4) in four zones, it takes place cotemporally with real magnetic changes which persist after the flare. Only for the other two zones does the flux density recover to the pre-flare level immediately after the flare.The physical implications of the flare-induced signal are discussed in view of its relevance to the non-thermal electron precipitation and primary energy release in the flare.     

Measurements of spectral lines observed with Hinode/EIS as implications for coronal heating

We have measured the line widths and nonthermal velocities in 12 solar regions using high resolution EUV data taken by Hinode/EIS. We find that there exists a positive correlation between the intensity and nonthermal velocity for the Fe XII emission line as well as some other lines. The correlation coefficients decrease from the disk center to the limb. However, the nonthermal velocities of a particular spectral line do not vary much in different regions, so they are considered isotropic. In particular, we find that for a coronal loop structure, the largest widths and nonthermal velocities occur at the footpoints, where outflows appear. Based on these observational results, we discuss several physical processes responsible for coronal heating.     

用于中阿合作的卫星激光测距(SLR)系统的现状和未来

简要介绍了用于中国科学院国家天文台与阿根廷San Juan大学合作观测与研究的一个高精度卫星激光测距(SLR)系统.该望远镜口径为60cm的SLR系统由中国研制,于2005年秋被运往阿根廷,安装在阿根廷国立San Juan大学天文台,San Juan大学建立了观测室.准备了工作条件.该系统于2006年2月底完成调试并开始运行.在过去的两年阃,该系统保持了良好的工作状态,由于San Juan具有良好的天气条件,该系统取得了丰富的高精度观测资料.国际激光测距服务认为该仪器的工作对国际激光测距系统是重要的,希望对其增加白天测距的功能.文章也简单介绍了该SLR站未来升级改造和发展的计划.     

胶州湾东北部海域生态环境污染状况研究

根据2004年5月和2005年5月两次对胶州湾东北部海域海水的盐度、pH、溶解氧、化学需氧量、无机氮、活性磷酸盐、铜、铅、锌、镉、多环芳烃和有机氯农药以及表层沉积物中有机碳、石油烃、硫化物、铜、铅、镉、汞、多环芳烃和有机氯农药测定结果,并结合2001年以来历史资料,对胶州湾东北部海域生态环境质量历史变化趋势进行了分析,该海域生态环境中除个别要素如活性磷酸盐、铅、镉、汞等重金属含量有所增加外,其他污染要素含量相对稳定且有下降趋势,2001—2005年该海域生态环境质量相对稳定,仅部分要素有加重趋势。     

黑龙江铁力兴安一带斑岩型钼矿资源潜力预测

黑龙江省铁力市兴安地区发育晚三叠世-早侏罗世的细粒二长花岗斑岩的U-Pb锆石LA-ICPMS年龄为195～201Ma,钼矿(化)体产于斑岩体的顶部或外接触带的中细粒似斑状二长花岗岩中,斑岩体的岩石学、矿化及围岩蚀变、地球化学异常特征,均显示出斑岩型矿床的特征.另外,在花岗质火山-侵入杂岩体中也见钼矿化,其异常模式虽显示出中温火山热液有关的特征,但从区域成矿演化特征来看,可能与晚三叠世-早侏罗世细粒二长花岗斑岩具有统一的构造-岩浆-成矿体系,具"同源不同环境、部位和同位、不同成矿期次"的特征.     

混合式数字化博物馆设计与研究

数字化博物馆是一种结合前沿技术开发的区别传统实体博物馆的综合服务信息系统。本文对目前采用的基于图形和基于图像的两种数字化博物馆构建方法进行分析比较,提出了一种室外采用三维建模、室内采用360°全景图的混合式构建方法。探讨了混合式数字化博物馆在场景漫游和场景切换方面的关键技术,设计并实现了混合式数字化博物馆的框架结构与部分功能,是数字化博物馆建设的一种新的尝试。