乌兹别克斯坦铀资源勘查开发现状及投资环境分析

乌兹别克斯坦是中亚铀资源最具勘查开发潜力的地区之一,因此了解并分析乌兹别克斯坦境内铀资源基本情况以及铀资源的投资环境,可为我国天然铀长期可持续发展提供基础和信息支撑。本文在调研权威网站及报告、跟踪最新资讯基础之上,对乌兹别克斯坦铀矿资源的分布、资源量、勘查开发利用现状和对外合作政策等各类数据信息进行了深入的综合分析,并提出了“实时关注乌兹别克斯坦矿业政策,利用先进的核工业技术,与其建立铀资源的互利合作关系,寻求项目合作开发”的建议。本文介绍、综述了乌兹别克斯坦铀资源分布规律及开发现状,希能为我国天然铀企业“走出去”提供重要的基础数据及信息支撑。     

作业调度软件LoadLeveler在气象模式中的应用

西北区域气象中心高性能计算集群使用LoadLeveler调度管理作业,为实现资源利用率和吞吐量的最大化,本文探讨了作业调度管理的作用和方法.通过配置文件关键字定义队列、设置调度算法和调度器调节参数,将作业的处理需求与可用资源进行匹配,依据实际需求定义集群和各种资源的可用性规则,防止作业之间的相互干扰.结合LoadLev...     

新仙女木事件及全新世早中期降温事件--来自洱海湖泊沉积的记录

利用洱海采得的沉积岩芯（EH孔）总有机碳（TOC）指标,分析了洱海流域13 ka cal BP以来的3次降温事件（新仙女木、9.4 ka cal BP和5.8 ka cal BP）,并和青海湖岩芯、古里雅冰芯进行了对比。结果表明：洱海对冷事件的响应时间比青海湖略晚,强度略弱,其原因主要与地理位置和青藏高原的阻挡有关;但古里雅冰芯中8.2 ka cal BP的显著冷事件在洱海和青海湖并无反映。对洱海TOC指标进行功率谱分析,表明存在3种千年尺度的气候变化周期：5 ka、2.3 ka和1.5 ka,显示了对亚轨道周期的响应。     

Timing analysis of the black hole candidate EXO 1846-031 with insight-HXMT monitoring

We present the observational results from a detailed timing analysis of the black hole candidate EXO 1846-031 during its outburst in 2019 with the observations ...     

南极菲尔德斯半岛土壤微生物在富集传代培养中对菲的响应

为揭示富集传代培养过程中南极多环芳烃降解菌群的演替规律,以菲为唯一碳源和能源对南极菲尔德斯半岛不同地理位置的6份土壤样品进行了富集和连续传代培养,并采用高通量测序技术分析了富集传代培养过程中菲降解菌群的群落结构及生物多样性.Alpha多样性分析结果表明,在富集培养阶段南极菲降解菌的物种丰富度显著高于传代培养阶段(P＜0...     

The Interannual Variation of Transboundary Contributions from Chinese Emissions of PM_(2.5) to South Korea

In recent years,several studies pointed out that anthropogenic emission sources in China which significantly contribute to the PM_2.5mass burden was an important cause of particulate pollution in South Korea.However,most studies generally focused upon a single pollution event.It is rare to see comprehensive research that captures those features prone to interannual variations concerning the transboundary pollutant contribution in South Korea using a unified method.In this paper,we establish the emission inventories covering East Asia in 2010,2015,and 2017,and then conduct the source apportionment by applying a coupled regional air quality model called the Integrated Source Apportionment Module(ISAM).Comparison of simulated and observed PM_2.5mass concentration at 165 CNEMC(China National Environmental Monitoring Center)sites suggests that the PM_2.5concentrations are well represented by the modeling system.The model is used to quantitatively investigate the contribution from emission sources in China to PM_2.5concentrations over South Korea and those features found to be prone to interannual variations are then discussed.The results show that the average annual contribution of PM_2.5has dropped significantly from 28.0%in 2010 to 15.7%in 2017,which strongly suggests that China has achieved remarkable results in the treatment of atmospheric particulates.     

梁柱组合节点的拟动力试验研究

本文主要介绍了所开展的梁柱组合节点的拟动力试验,梁柱连接采用高强度螺栓平端板形式。试验采用经过调幅的具有不同地震加速度峰值的Ispara地震动作为激励进行加载,对试件在地震作用下的加速度反应、位移反应、滞回性能、刚度和耗能进行分析,对试验现象和结果进行了比较详细的阐述和分析。     

Spatial and temporal patterns of solar radiation in China from 1957 to 2016

Solar energy is clean and renewable energy that plays an important role in mitigating impacts of environmental problems and climate change. Solar radiation received on the earth’s surface determines the efficiency of power generation and the location and layout of photovoltaic arrays. In this paper, the average daily solar radiation of 77 stations in China from 1957 to 2016 was analyzed in terms of spatial and temporal characteristics. The results indicate that Xinjiang, the Qinghai-Tibet Platea...     

Post-depositional modification of NO-3 in snow layers at EastAntarctica and at the headwater of ürumqi River

Acidic species, such as Nitrate, in polar snow and firn layers are “reversibly” deposited, and are sufficiently volatile to undergo significant postdepositional exchange between snow/firn and the atmosphere. Through comparison of the snowpit and snowpack nitrate concentrations from central East Antarctica and the headwater of ürumqi River, we conclude that the nitrate peaks in the uppermost surface snow layers in central Antarctica are not related to an atmospheric signal and must account for post-depositional effects. Such effects, however, are not found in the surface snowpack nitrate profiles from the headwater of ürumqi River. Two reasons may account for the post-depositional difference. At first, nitrate in the polar snow and firn layers appears to be hydrated ion, which can be taken up by the atmosphere, while at the headwater of ürumqi River it seems mainly as mineral ion, which assembles the behavior of aerosol-derived species that are “irreversibly” deposited and do not undergo significant post-depositional exchange with the atmosphere. Secondly, the chemical features of the snow and ice on the Antarctica are mainly determined by wet deposition, to the contrary, dry deposition is more significant at the headwater of lUrumqi River than that on the East Antarctic Plateau.