银盘恒星运动学和化学丰度与银河系结构

大样本的银盘恒星的运动学数据和元素丰度特征是研究银河系结构及演化，尤其是银盘形成和演化的2个重要探针。本文首先介绍了银河系的总体结构特征，然后较详细的综述了以上2个探针的重要性。对我国LAMOST项目在研究银河系结构方面，尤其是银盘的形成和演化方面的能力作了合理的分析。     

疏散星团NGC6530天区的恒星自行和成员概率

利用上海天文台的照相底片资料,确定了疏散星团NGC6530天区364颗恒星的自行和成员概率,并对有关自行测定的方法、结果和精度等问题作了较为详细的介绍和讨论。使用的底片历元差为87年,全部恒星自行中误差的均方根值为1．09mas/a。     

试论接闪器的保护范围及其应用

讨论了接闪器的布置方法及其保护范围的确定方法,并针对应用中出现的一些问题提出了具体的解决方案。     

Investigating variable stars in the open cluster NGC 1912 and its surrounding field

In this work,we studied the variable stars in the open cluster NGC 1912 based on the photometric observations and Gaia DR2 data.More than 3600 CCD frames in B,V,R filters were reduced,and we obtained the light curves that span about 63 hours.By analyzing these light curves,we detected 24 variable stars,including 16 periodic variable stars,seven eclipsing binaries and one star whose type is unclear.Among these 24 variable stars,11 are newly discovered,which are classified as sixγDoradus stars,oneδScuti star,three detached binaries and one contact binary.We also confirmed 13 previously known variable stars.Based on cluster members identified by Cantat-Gaudin et al.(2018),we inferred cluster memberships for these detected variable stars.Using Gaia DR2 data,we plotted a new color-magnitude diagram for NGC1912,and showed the nature of variable cluster members in kinematical properties and heliocentric distance.Among the 24 variable stars,seven variables are probable cluster members,which show homogeneity in kinematic characters and space position with the established cluster members.Four of the seven variable cluster members are the previously discovered stars,consisting of twoγDor stars and twoδSct stars.The remaining three variable cluster members,which are allγDor stars,are firstly detected in this work.The main physical parameters of these variable cluster members estimated from the color-magnitude diagram are log(age/yr)=8.75,[Fe/H]=-0.1,m-M=10.03 mag,and E(B-V)=0.307.     

Discovery of Four New Clusters in the Cygnus Cloud

We report the discovery of four new open clusters(named QC 1,QC 2,QC 3 and QC 4)in the direction of Cygnus Cloud and select their members based on five astrometric parameters(l,b,ω,μα*,μδ)of Gaia DR2.We also derive their astrophysical parameters for each new cluster.Structure parameters are generated by fitting the radial density distribution with a King’s profile.Using solar metallicity,we performed isochrone-fitting on their purified color-magnitude diagrams(CMDs)to derive the age of the clusters.The known cluster NGC 7062 in an adjacent area is chosen to verify our identification process.The estimated distance,reddening and age of NGC 7062 are in good agreement with the literature.     

新疆天文台南山1 m宽视场光学望远镜测光系统

测光系统的流量定标是一项重要和基础的工作,其中影响流量定标的主要因素有探测器响应(测光零点)、颜色改正项和大气质量等.利用新疆天文台南山1 m宽视场光学望远镜对Landolt标准天区J054610+45的测光标准星进行了大气质量不同条件下的U,B,V,R,I多波段观测,根据布格定律求得了大气消光系数;并利用2017年1...     

D函数规律在油气综合化探中的应用

本文主要研究了D函数规律应用于油气化探可能性。并从天然水系中D函数的分布特征出发,运用作为油气化探的基础理论——垂直运移假说,探讨了油气化探中D函数规律的形成机理。本文作者还运用了泌阳凹陷油气化探资料,在双河油田以及下二门油田上方建立了浅层地下水的D函数异常模式。并依据双河油田和下二门油田上方浅层地下水的D函数异常模式,对泌阳凹陷古城地区进行了预测,圈定了一个D函数综合异常。该异常现经钻探已发现工业油气流。最后,对浅层地下水中D函数环状地球化学晕的形成机理进行了讨论。并论述了D函数规律在油气化探中的作用与地位。     

某电力扩建场地工程地震条件分析

本文采用工程抗震理论,结合场地实际状况,论述了某电力扩建场地的区域构造条件和区域地震环境,确定了场地的地震动参数,并采用概率地震危险性分析法对扩建场地进行地震危险性分析,从而为该工程建设提供合理的设计依据.     

卫星导航系统星间链路分析

对全球卫星导航系统星间链路的几何特性进行分析、仿真，并且对星间链路应该采用的频段进行选择，进而根据星间链路应该达到的技术指标进行星间链路预算，为星间链路系统的设计奠定基础。     

建议加强农业气象预报工作

近几年来,天气预报为各行各业及时地提供了服务,成绩是很大的。但对农业生产来说还满足不了需要。例如在早稻育秧时只报什么时候来寒潮是不够的,还应当指出是否会达到气温低于10℃并连续4天以上的烂秧指标。否则农村干部群众就无法准确掌握护秧时机。1980年我县新河公社早稻就因为持续低温阴雨烂秧20万斤。又如5月低温,天气预报往往只报该