Properties of Galaxies in the Second Byurakan Survey. II. Characteristic Features of a Separate Sample of Galaxies

Some features of a sample of galaxies from the Second Byurakan Survey are discussed. Most of them are small galaxies with star formation. It is shown that different types of galaxies are in the Survey, with high, medium, and low levels of excitation and continua ranging from blue to relatively red. Many of the galaxies have absorption lines in their spectra; their continua are formed by stars in later spectral classes.     

B0712+472: a new radio four-image gravitational lens

A new four-image gravitational lens system, B0712+472, has been discovered during the Cosmic Lens All-Sky Survey. This system consists of four flat-spectrum radio images that are also seen on a Hubble Space Telescope ( HST ) image, together with the lensing galaxy. We present MERLIN, VLA and VLBA maps and WHT spectra of the system as well as the HST images. The light distribution of the lensing galaxy is highly elongated and so too is the mass distribution deduced from modelling. We suggest a redshift of ∼1.33 for the lensed object; the lens redshift will require further investigation. The discovery of this new system further increases the ratio of four-image to two-image lens systems currently known, exacerbating problems of required ellipticity of matter distributions in lensing galaxies.     

阳城煤矿瓦斯地质规律研究

运用沉积学、构造地质学、煤地质学、数学分析等相关学科和方法,综合分析瓦斯涌出量的地质构造、顶底板岩性、上覆基岩厚度等地质因素,对阳城地区瓦斯含量、涌出量进行量化预测,并作出其全井田瓦斯含量、涌出量的等值线图。研究表明,阳城井田属低瓦斯矿井,瓦斯含量的变化主要与煤层埋深有关,随着煤层上覆基岩厚度以及煤层埋深的增高,瓦斯含量与涌出量在区内由北向南有增高趋势。     

攀枝花市大气污染物降水清除机制的研究

本文采用了主成份分析及因子分析的方法,研究了影响降水pH值的主要源及其贡献和这些源被降水清除的机制。分析结果表明:大气中一次污染物是影响降水pH及各种成分浓度的主要因素。人为污染源包括高排放源、低排放源和汽车源,它们的排放物以碱性物质为主;自然污染源包括输送物、腐烂物、自然NOx等,它们的排放物主要是酸性物质;在一般情况下,降水的pH值取决于高、低排放源排放的碱性物质的多寡;降水量越大,清除的污染物越多,在雨季各测点降水平均pH值为6.31～7.10。在高排放源影响小的地方,对持续时间长的大雨,降水后期的pH能反映自然源的影响,其值小于5.60。可见,攀枝花市酸雨几率极低甚至降水呈碱性,     

空气滤膜采集大气浮尘样品中多元素的测定

用氢氟酸-盐酸-硝酸-高氯酸体系对空气滤膜上附着的浮尘样品进行分解,电感耦合等离子体发射光谱法、电感耦合等离子体质谱法同时测定溶液中15个主量和微量元素铁、铜、锌、镍、镧、铈、锂、锰、铬、镉、钴、铅、钍、铊、铀。将国家一级标准物质模拟浮尘样品加入空白滤膜进行测定,结果与标准值相符。各元素4次测定结果的相对标准偏差(RSD)小于5%。     

CARBON DYNAMICS OF WETLAND IN THE SANJIANG PLAIN

1INTRODUCTIONWetlandsplayanimportant roleintheprocessofcar-bonstorage.Thetotalcarbonstoredindifferentkindsofwetlandsisabout15%-35%ofthetotalcarboninthegloballandsoils(POSTetal.,1982;GORHAM,1991).Inaddition,wetlandsaresignificantnaturalsources fortheatmospheric CH4 (MOORE,1994).It isestimatedthatabout110×1012gCH4 originates fromanaerobicdecompositioninthenaturalwetlands,CH4 emission fromthenaturalwetlandsis15%-30%oftheglobalCH4 emission andtheCH4 emission from thepeat land at hi…     

中高温三轴应力下鲁灰花岗岩热破裂声发射特征的试验研究

在中高温三轴应力作用下岩石内部物理化学性质和结构特性将发生变化,随着岩石内部结构的变化会引发一系列的声发射现象。通过试验研究了大试件花岗岩在三轴压力状态下声发射随温度的变化规律。试验研究表明：①随着温度升高,岩石的声发射现象是间断发生的;②花岗岩存在一个开始发生热破裂的门槛值温度,其值为120 ℃左右;③试验温度范围内花岗岩热破裂的声发射现象可分为5个阶段,即岩石原生裂隙整合阶段、热破裂前声发射静默阶段、热破裂声发射阶段、大规模热破裂后声发射静默阶段、二次热破裂开始阶段。     

First results from the Gauribidanur Radio heliograph

Observations of the Sun at two frequencies (51 and 77 MHz) using the East-West arm of the Gauribidanur Radio heliograph are presented.     

Solar radio burst (type III)

This article describes the observations of a type III radio burst observed at 103 MHz simultaneously by the two radio telescopes situated at Rajkot (22.3°N, 70.7°E) and Thaltej (23°N, 72.4°E). This event occurred on September 30, 1993 at about 0430 UT and lasted for only half a minute. The event consisted of several sharp spikes in a group. The rise and fall time of these are comparable, however the peaks of individual spikes varied by a factor of four. The comparison of these observations with the data of solar radio spectrograph HiRAS indicates that this was a metric radio burst giving highest emission at about 103 MHz.