基于网络存储虚拟化技术的海量GIS数据存储方法研究

针对GIS数据存储特点,结合网络存储和虚拟化技术的优势,提出了基于网络存储虚拟化技术的GIS数据存储方案,并进行了实验研究,较好的解决了网络环境下GIS数据的存储和管理问题。     

关于我国北方干旱化及其转折性变化

过去半个世纪,中国经历了北方的"西湿东干"和东部的"南涝北旱"的降水分布格局。近十几年来,这种降水长期变化的分布格局是维持还是发生了变化?针对这个问题,本文基于年降水观测数据、自矫正的帕尔默干旱指数scPDSI、地表湿润指数SWI及GRACE（Gravity Recovery and Climate Experiment）卫星数据反演的陆地水储量（TWS）对中国区域干旱化问题进行了再分析。结果表明,近16年（2001~2016年）,中国东部地区（100°E以东）"南涝北旱"的格局正在发生显著的变化,长江上中游及江淮流域已转为显著的干旱化趋势,而华北地区的降水已转为增加趋势,东部"南旱北涝"的格局基本形成;北方过去的"西湿东干"也转变为"西干东湿"的空间分布特征。显然,中国区域的降水格局在2001年后发生了明显的年代尺度转折性变化,两种常用干旱指数scPDSI和SWI的分析也证明了这一点。但GRACE的陆地水储量（TWS）的分析却显示,最近16年来,中国东部"南涝北旱"的格局仍未发生变化,北方大部分地区仍然处于干旱化的时段,且有加剧的趋势,其原因有待于进一步研究。     

十三陵抽水蓄能电站上池西外坡岩体稳定分析

上池西外坡岩体稳定是十三陵抽水蓄能电站主要的地质工程问题之一,由于受到倾向池外的数条缓倾角断层以及不良的岩体结构控制,存在着滑动位移、变形失稳的可能性,电站的安全运行受到潜在的威胁。因此对西外坡岩体进行稳定分析,并进行补强处理是必要的。     

Progress and Prospect of Geophysical Research on Underground Gas Storage: A Case Study of Hutubi Gas Storage, Xinjiang, China

Hutubi Underground Gas Storage (UGS) is an important part of China''s West-East Gas Pipeline Project. Its production safety also plays an essential role in ensuring peaking, emergency and reserve of natural gas in the region. Geophysical observations and research conducted on Hutubi UGS provide significant support for understanding the operation status and ensuring safe operation of the UGS. Since the beginning of the construction of Hutubi UGS and its production, several works including gas field observation experiments,rock experiments and numerical simulations have been conducted. Preliminary observational results show that during the initial operation stage of the UGS, the "breathing phenomenon" in caprock and microseismicity in the vicinity are closely related to the operation of the gas storage. However,rock experiments and numerical simulations show that these activities may gradually weaken with the multi-cycle operation of gas storage. The impact of the operation of Hutubi UGS in the surrounding areas is gradually weakening, and its operation tends to be stable.Implementing long-term and multi-method geophysical observations is able to provide us a better understanding of the relationship between the operation of UGS and regional geological hazards. On this basis, the corresponding geomechanical model can be established to form an effective risk management mechanism for gas storage operation. Thus, it is of great significance to understand its operation status, monitor storage conditions, guide production and operation, and ultimately guarantee the safe production of the gas storage.     

滕县、兖州煤田红层的富水性及其对煤炭开采的影响

在滕县、兖州含煤盆地内,上侏罗统红层直接覆盖于二叠、石炭系煤系地层之上,在勘探时期曾被归为隔水层。本文通过现场资料分析和大量室内测试结果,系统研究了本区红层的化学成分和矿物组成、储水空间和分布特征及其红层地下水对煤矿开采的影响。作者得出下列结论:在岩性和构造适宜地段,红层中可以赋存较为丰富的地下水,他们既是许多煤矿的供水水源,又对煤矿的开采构成充水威胁,并通过采动裂隙引发突水事故。     

Advance in Studies on Intracellular Nitrate Storage and Denitrification of Benthic Foraminifera

Benthic foraminifera is the first kind of eukaryotes reported to carry on denitrification, which breaks the understanding of the eukaryotic metabolic way. Numerous studies have demonstrated that the contribution of benthic foraminifera to sedimentary denitrification exceeds the prokaryotes. Furthermore, benthic foraminifera stores large amount of nitrate intracellularly, which far exceeds the amount of nitrate in pore water. These findings challenge our understanding of the nitrogen cycle in sediments. The study of foraminiferal intracellular nitrate storage and denitrification is significant to figure out the metabolic way of eukaryote in anoxic environment and to quantify the balance of nitrogen in marine environment. The history of foraminiferal intracellular nitrate storage and denitrification study was discussed. In addition, the distribution of foraminiferal intracellular nitrate and denitrification rates in marine environment was also discussed. The latest research progresses about the related mechanism were also summarized. Finally, the problems and challenges in present and future studies were discussed.     

环氧乙烷储运系统环境风险预测与预防措施

以某化工厂环氧乙烷储运系统发生环境风险事故为例,通过风险识别和源项分析,利用有关技术导则中推荐的模式对发生环境风险事故的后果进行预测,得出环氧乙烷储运系统发生泄漏或爆炸时可能造成轻伤、重伤及死亡影响范围的预测结果;同时从风险防范措施和应急预案两方面对环氧乙烷储运系统提出了防范措施,主要包括环氧乙烷的应急处理措施、围堰及事故池的设置、其他风险防范措施要求、运输风险防范措施和环境风险事故应急预案。通过采取以上防范措施,不仅可以最大程度地降低环氧乙烷储运系统环境风险事故发生的概率,而且可以将环境风险事故发生后对环境可能造成的不良影响降至最低。     

Channel responses to varying sediment input: A flume experiment modeled after Redwood Creek, California

At the reach scale, a channel adjusts to sediment supply and flow through mutual interactions among channel form, bed particle size, and flow dynamics that govern river bed mobility. Sediment can impair the beneficial uses of a river, but the timescales for studying recovery following high sediment loading in the field setting make flume experiments appealing. We use a flume experiment, coupled with field measurements in a gravel-bed river, to explore sediment transport, storage, and mobility relations under various sediment supply conditions. Our flume experiment modeled adjustments of channel morphology, slope, and armoring in a gravel-bed channel. Under moderate sediment increases, channel bed elevation increased and sediment output increased, but channel planform remained similar to pre-feed conditions. During the following degradational cycle, most of the excess sediment was evacuated from the flume and the bed became armored. Under high sediment feed, channel bed elevation increased, the bed became smoother, mid-channel bars and bedload sheets formed, and water surface slope increased. Concurrently, output increased and became more poorly sorted. During the last degradational cycle, the channel became armored and channel incision ceased before all excess sediment was removed. Selective transport of finer material was evident throughout the aggradational cycles and became more pronounced during degradational cycles as the bed became armored. Our flume results of changes in bed elevation, sediment storage, channel morphology, and bed texture parallel those from field surveys of Redwood Creek, northern California, which has exhibited channel bed degradation for 30 years following a large aggradation event in the 1970s. The flume experiment suggested that channel recovery in terms of reestablishing a specific morphology may not occur, but the channel may return to a state of balancing sediment supply and transport capacity.     

SQL Server数据库中数据的安全监控

本文主要阐述了作者在工中遇到的SQL Server数据库中一些重要数据泄漏或是异常变动现象,随后通过各种技术手段追踪数据异常变更的根源的学习研究过程.从而达到了对日常工作中的重要数据进行安全监控、跟踪相关操作的目的,同时,也为各类数据的安全性、准确性提供了坚实的保障.     

实时气象资料归档与检索系统

实时气象资料归档与检索系统是沈阳中心气象台根据实际工作的需要,研制开发的气象资料应用管理系统。系统以磁盘阵列和DVD光盘为主要存储介质,利用自动分类、光盘刻录的自动控制和多样化的检索技术,实现了气象资料的自动存储与管理。介绍了系统的功能特点和自动控制光盘刻录技术,为其他资料存储系统的开发提供了可借鉴的设计思路。