跟类星体红移宇宙学解释相符合的证据

分析类星体吸收线红移和发射线红移的特征。我们从Hewitt和Burbidge（1993）的星表中选择了吸收线红称和发射线红移都同时提供的类星体，得到了包含401个对象的样本。这是至今对类星体红移研究的最大样本。我们从吸收线红移和发射线红移之间的关系图发现绝大多数（93．6％）对象的吸收线红移都小于相应的发射线红移。这个结论人们在20世纪70年代已经从很小的类星体样本（样本大小50左右）中得到。本文进一步支持了这个结论。它表明类星体红移确实是距离的指示器。这跟宇宙学对类星体红移的解释是一致的。     

PRELIMINARY STUDY ON THE FLOODING AND DROUGHT CLAMITY DURING PAST 1500 YEARS IN THE HAI′AN REGION，JIANGSU PROVINCE

Collection and arrangement of the historical records of climatic changes and environment evolution,espectial-lyin the aspect of calamities,are made on the history documents of past 1500 years about Haiˊan region,Jiangsu Province.There existed two obvious flooding-drought frequently-occurring periods:one was from 1550 AD to 1850 AD and another was 100 AD to 1200AD.The period of 1550 AD to1850 AD is interrupted by two relatively arid and cold climatic periods:one was from 1630 AD to 1700 AD and another was 1750 AD to 1820 AD.The main characteristic of the calamity periods is that they occurred by turns,and sometimes,both drought and flooding occurred in the same year.The instability of the climatic changes in the Little Ice Age may be the main reason of the frequently-occurring flooding and drought in Haiˊan region.Research results also show that the frequently-occurring periods of flooding and drought is in close relationship with the solar activity,and therefore,occurrence of the flooding and drought may be in relation with the intensity of the solar activity.This hypothesis may need further study in the future.     

A STUDY ON LAND SYSTEM INNOVATIONS IN THE CONSTRUCTION OF SMALL TOWNS IN CHINA

The economic development in China and the rising of the living standard need to speed up the urbanisa-tion.The development of small towns is an important way to Chinese urbanization.Land use plays a very important role in the development of small towns.However there are many problems in the development of small towns,esp.in land use.The paper first discusses the land problems in the development of small towns.Such as much cultivated land lies idle,under-utilization and waste of land,increasing illegal use of land,unstable contractural relationship for land use.The relationship between the development of small towns and land use is also studied.Then the guidelines for the land system innovations of small towns are put forward.Namely the sustainability of social and economic development,the bal-ance between land reservation and land utilization,the provision of service to village ,agriculture and farmer,the manage-ment of land resource and land assets,the parsimonious andlegal use of land.The basic framework of land system innova-tions of small towns is put forward finally.It include the land replacement policy for small towns and the permanent tenan-cy of farmland,the overall plan for land uses and other plans in harmony,the establishment of a flexible system of land supplies,using land with payments ,the transfer of agricultural land and refining the land law related to the construction of small towns.     

猎户星云星团天区1663颗恒星的综合自行

本文将近期国外发展的四份猪户星云星团天区内有较高精度的自行资料转换到上海天文台所得同一区的恒星自行系统，并进行了合并，得到该天区内1663颗恒星的高精度自行和成员概率，为进一步研究猎户星云星团的天体物理性质和内部运动提供了一份有较大视场范围和较宽星等范围的高精度自行样本。     

美国“鲨鱼”隐身快艇

最近美国洛克希德-马丁公司公开了正在研制的“鲨鱼”隐身高速快艇的独特设计——造型奇特．双体船型，隐身设计．折叠结构．强大武备．多种用途。“鳖鱼”隐身高速快艇在外形和武器配备等方面借鉴了武装直升机和快艇的一些特点．被称为是武装直升机与快艇的“混血儿”。该设计可以称得上是应用高新科技成果进行舰艇跨越式创新发展的典范，在舰艇界引起很大的反响。     

天文像复原迭代位移叠加法中初始信息的选择

给出了天文像复原“迭代位移叠加法”的第一步中确定位移基准点的方法-将目标像结构的初始信息与目标斑点图间的互相关性运算的极大值点作为基准点，按此基准点对目标斑点图进行位移叠加，第一步中初始信息的选择是展开迭代位移叠加过程的关键。讨论了目标初始信息的性质和提取方法。     

疏散星团M11的研究——相对自行和成员概率

本给出了疏散星团M11中心25′×25′天区内872颗恒星的相对自行、自行测定误差以及团中心距r≤25′范围内785颗恒星的成员概率，并对有关问题作了简单的讨论。     

Ellerman Bombs,Type Ⅱ White—light Flares and Magnetic Reconnection in the Solar Lower Atmosphere

Ellerman bombs and type Ⅱ white-light flares share many common features despite the large energy gap between them.Both are considered to result from local heation in the solar lower atmosphere.This paper presents numerical simulations of magnetic reconnection occurring in such a deep atmosphere,with the aim to account for the common features of the two phenomena.Our numerical results manifest the following two typical characteristics of the assumed reconnection process:(1)magnetic reconnection saturates in-600-900s,which is just the lifetime of the two phenomens;(2)ionization in the upper chromosphere consumes quite a large part of the energy released through reconnection,making the heation effect most significant in the lower chromosphere.The applicationof the reconnection model to the two phenomena is discussed in detail.