铀—油相伴性探讨

本文以内蒙古二连盆地额仁淖尔凹陷内的铀矿床、油气藏为例,通过对这两种矿产在空间分布,地质、水化学、地球化学特征等方面联系证据的分析研究,探讨其相伴性的成因机理,概括总结铀－油相伴性的机理模式,为这两种相关矿种互相指示找矿提供了依据。     

1999年山西大同-阳高5.6级地震灾害损失评估

１９９９年１１月１日在山西省大同县和阳高县间发生Ｍｓ５．６地震,通过野外调查,对这次地震灾害损失进行了评估。评估结果表明,这次地震受灾面积达３２４ｋｍ＾２,主要受灾村５６个,重伤１０人,轻伤６０人,总经济损失为１４０２３万元。指出灾区所有房屋经历了１９８９年、１９９１年１次或２次中强地震的破坏,抗震能力明显降低是这次震害较生的主要原因。并针对这次震害的特征,提出防御与减轻震害的经验、教训及有关建议     

中国地震局青年科技代表团赴土耳其、希腊进行地震工作考察

２０００年６月１３～２４日中国地震局青年科技代表团赴土耳其、希腊进行了地震工作考察,文章介绍了这次考察的概况,并根据考察其间了解的情况,较详细地介绍了土耳其伊兹米特地震和土耳其地震研究工作,希腊的地震研究和雅典中强地震;欧洲工程地震学与地震工程及地震学实验场;科林斯地震预报实验场,以及土耳其和希腊两国的防震减灾工作。     

Cyclic test of a coupled steel plate shear wall substructure

Coupled steel plate shear wall (C‐SPSW) consists of two or more steel plate shear walls interconnected by coupling beams at the floor levels. In this study, a six‐story C‐SPSW prototype building was designed. A 40% scale C‐SPSW specimen, which is representative of the bottom two‐and‐half‐story substructure of the prototype, was cyclically tested using Multi‐Axial Testing System at the National Center for Research on Earthquake Engineering in 2009. In addition to a constant vertical force representing the gravity load effects, cyclic increasing displacements and the corresponding overturning moments transmitted from the upper stories were computed online and simultaneously applied on the substructural specimen. This paper firstly introduces the designs of the prototype C‐SPSW and the test specimen. Then, the test results and the numerical simulation are discussed in detail. Test results confirm the effectiveness of the proposed column capacity design method, which aims at limiting the plastic hinge formation within the bottom quarter height of the bottom column. Test and analytical results suggest that the coupling beam rotational demands can be estimated as the design story drifts when the formation of desirable plastic mechanism of the C‐SPSW is expected. Copyright © 2011 John Wiley & Sons, Ltd.     

Application of food waste based diets in polyculture of low trophic level fish: Effects on fish growth,water quality and plankton density

Food waste was collected from local hotels and fish feed pellets were produced for a 6 months long field feeding trial. Three types of fish feed pellets (control diet: Jinfeng® 613 formulated feed, contains mainly fish meal, plant product and fish oil; Diet A: food waste based diet without meat and 53% cereal; Diet B: food waste based diet with 25% meat and 28% cereal) were used in polyculture fish ponds to investigate the growth of fish (grass carp, bighead and mud carp), changes in water quality and plankton density. No significant differences in the levels of nitrogen and phosphorous compounds of water body were observed between 3 fish ponds after the half-year feeding trial, while pond receiving Diet A had the highest density of plankton. The food waste combination of Diet B seems to be a better formulation in terms of the overall performance on fish growth.     

Increased zooplankton PAH concentrations across hydrographic fronts in the East China Sea

The Changjiang has transported large quantities of polycyclic aromatic hydrocarbons (PAHs) to the East China Sea (ECS), but information of these pollutants in zooplankton is limited. To understand PAHs pollution in zooplankton in the ECS, total concentrations of PAHs in zooplankton from surface waters were measured. Values of PAHs ranged from 2 to 3500 ng m⁻³ in the ECS, with highest PAHs levels located at the salinity front between the Changjiang Diluted Water (CDW) and the mid-shelf waters. In contrast, concentrations of zooplankton PAHs in the mid-shelf and outer-shelf waters were significantly lower (2–23 ng m⁻³) than those in the CDW. These results demonstrate that PAHs are conspicuously accumulated in zooplankton at the salinity front between the CDW and the mid-shelf waters. These higher levels of PAHs in zooplankton at the salinity front may be further biomagnified in marine organisms of higher trophic levels through their feeding activities.     

Glacier runoff variation and its influence on river runoff during 1961–2006 in the Tarim River Basin, China

Using monthly precipitation and temperature data from national meteorological stations, 90 m resolution DEM and a digital vector map of modern glaciers from the Chinese Glacier Inventory, the glacier mass balance and glacier runoff in the Tarim River Basin (TRB), China, were estimated based on a monthly degree-day model for 1961–2006. The results suggest that the modified monthly degree-day model can simulate the long-term changes in glacier mass balance and glacier runoff, which have been confirmed by shor...     

云南天文台学位研究生招收培养简况

云南天文台 1 984年经国务院学位办批准获天体物理专业博士、硕士学位授予权 ;1 994年获天体测量与天体力学专业硕士授予权 ;1 990年获天文仪器与方法专业硕士授予权 ;1 997年专业调整 ,天文学一级学科含天体物理、天体测量与天体力学两个专业。本台自 1 982年招收硕士研究生 ,迄今为止 ,共招收硕士生 1 9届 1 0 3人 ,毕业 80人 ,授学位 83人 (含在职人员申请学位 3人 ) ,现在学 1 8人 ;自 1 986年招收博士生 1 4届 68人 ,毕业 2 6人 ,授学位 2 7人 ,现在学 3 6人 (含院省合作、委托培养 ,及在职人员申请学位 1人 )。云南天文台毕业硕士、博…