Gamma—Ray Bursts：Afterglows and Central Engines

Gamma-ray bursts (GRBs) are the most intense transient gamma-ray events in the sky; this, together with the strong evidence (the isotropic and inhomogeneous distribution of GRBs detected by BASTE) that they are located at cosmological distances, makes them the most energetic events ever known. For example, the observed radiation energies of some GRBs are equivalent to the total convertion into radiation of the mass energy of more than one solar mass. This is thousand times stronger than the energy of a supernova explosion. Some unconventional energy mechanism and extremely high conversion efficiency for these mysterious events are required. The discovery of host galaxies and association with supernovae at cosmoligical distances by the recently launched satellite of BeppoSAX and ground based radio and optical telescopes in GRB afterglow provides further support to the cosmological origin of GRBs and put strong constraints on their central engine. It is the aim of this article to review the possible central engines, energy mechanisms, dynamical and spectral evolution of GRBs, especially focusing on the afterglows in multi-wavebands.     

川西洛带气田蓬莱镇组储层特征

通过对四川盆地西部洛带气田侏罗系蓬莱镇气藏物性特征、孔隙结构特征的研究，分析了成岩作用对储集性能的影响，并进行了储集岩的分类和评价。     

兴城温泉热储构造与成因探讨

兴城温泉属断裂型热矿水,主要由西部丘陵区的降水补绐。导水通道以东西向断裂为主,导热通道为新华夏深大断裂。地下水在东西向断裂和新华夏断裂深部约1400m的交汇部位被加热,在新华夏低序次旋卷构造,即帚状构造的张性兼扭性断裂破碎带中富集。富集带的钻孔涌水量3000-4000m~3/d,水温66.5℃,矿化度4.309g/l,SiO_260·0mg/l,氡188.7-244.2×10~3Bq/m~3并含有Sr、Li、Mo、Rb、Ni、Cs等元素,属Cl-NaCa型。     

热释卤素找矿方法

热释卤素找矿方法试验研究在滨海冲积平原区,温暖潮湿和干旱的残积物、冲积物覆盖区,以及干旱草原和戈壁残山区的不同种类矿床上,均获清晰的异常。证明该方法在第四系覆盖区找盲矿、隐伏矿或查明断裂构造效果明显。     

蚌埠隆起北翼陷落柱的发育规律及其导水性判别--以刘桥一矿为例

在分析和总结了大量水文地质资料的基础上,详细地分析了淮北煤田陷落柱的分布规律,并以刘桥一矿为例讨论了陷落柱导水性的判别方法.认为陷落柱的产状、"通天性"和控制断层是判别陷落柱导水性的主要标志.联系华北地区的许多矿区的实际情况,这些标志对华北地区许多矿井的安全生产具有一定的实用价值和指导作用.     

水库拖网及其技术性能的探讨

随着我国水库渔业的发展，近年来高效率的捕鱼工具“拖网”在东北及中南的一些水库先后投入生产。据了解目前水库的拖网类型计有底拖网、浮拖网和中层拖网等三种。