The mass-balance characteristics and sensitivities to climate variables of Laohugou Glacier No. 12, western Qilian Mountains, China

Due to global warming, glaciers on the Tibetan Plateau(TP) are experiencing widespread shrinkage; however, the mechanisms controlling glacier variations across the TP are still rather unclear, especially on the northeastern TP. In this study, a physically based, distributed surface-energy and mass-balance model was used to simulate glacier mass balance forced by meteorological data. The model was applied to Laohugou No. 12 Glacier, western Qilian Mountains, China, during2010~2012. The simulated albedo and mass balance were validated and calibrated by in situ measurements. The simulated annual glacier-wide mass balances were-385 mm water equivalent(w.e.) in 2010/2011 and-232 mm w.e. in 2011/2012,respectively. The mean equilibrium-line altitude(ELA) was 5,015 m a.s.l., during 2010~2012, which ascended by 215 m compared to that in the 1970 s. The mean accumulation area ratio(AAR) was 39% during the two years. Climatic-sensitivity experiments indicated that the change of glacier mass balance resulting from a 1.5 °C increase in air temperature could be offset by a 30% increase in annual precipitation. The glacier mass balance varied linearly with precipitation, at a rate of130 mm w.e. per 10% change in total precipitation.     

THE CHARACTERISTICS OF RAINFALL AND DISASTERS OF DEBRIS FLOW IN BEIJING AREA

LINTRODUCTIONDisastersofdebrisflotvoccurfrequentlyinChina.Mostofthemareinrainstormtype.TherainStormdebrisflowiscausedbyStormrainfallthatinducesastrongStreamflowsonloosematerialsinwatershed.Theeffectsofprecipitationonthedebrisflowareasfollows(ChengduResearchInstituteC;DisasterandEnvironment,1989)f(l)Precipitationacceleratesthematerialsofloosedebristogather,(2)PrecipitationsuPPlywatercomponentofdebrisflow,(3)Precipitationprovidesdynamicconditionsfordebrisflow,(4)Precipitationisatrigg…     

白山市三岔子区大安屯ML4.7级地震发震构造背景及地倾斜异常特征

给出了１９９４年１月２５日在吉林省白山市三岔子区大安屯地震的基本参数，烈度分布与震害，分析发震的地质构造背景，总结发震前的地倾斜异常特征。     

在二维和三维CT图象重建理论方法的研究工作及新进展

本文主要介绍近几年清华大学工程物理系“粒子技术与辐射成象”国家专业实验室在二维和三维ＣＴ图象重建领域的研究成果，这些成果基本上代表了我国在核领域的研究水平。     

青海某矿浮选尾矿浸铜、金的研究I.铜的浸取

分别用常规浸取法和协同浸取法对青海某矿浮选尾矿进行浸铜的研究。使铜的浸取率由常规法的40％提高到协同浸取法的60—70％。这对于解决含结合氧化铜较高的金属尾矿的湿法冶金无疑是一个好方法。     

海洋和电离层发电机对佘山台L的影响

本文在文献[1]的研究基础上进一步分析海洋和电离层发电机对佘山台L的影响。资料分别按月、季节和年以及太阳活动性分组进行的细致分析,结果表明海洋发电机对Z分量的L有一稳定的影响,L的季节变化主要起源于电离层发电机。L的海洋部分不随太阳活动性改变,太阳活动对L的影响比对S的小。     

嶂石岩地貌之发现及其旅游开发价值

本文在与有关地貌类型进行比较研究的基础上,提出了一种新型的地貌类型——峰石岩地貌,分析了它的特点、成因,研究了发育模式和形态分类,并对其景观旅游开发价值做了分析,给予较高的评价,认为它是一种重要的山岳型风景资源。目前已有多处被批准为国家级或省级风景名胜区,并取得显著的经济效益。     

地震分析软件FFSS系统

FFSS地震分析软件系统包括基础数据管理，地震定位，常规和非常规地震活动分析，地震序列分析，各类空间扫描，时间进程分析，地震时间、空间和时间空分形图及适于群体前兆项的系统信息熵计算等。为便于地震专业或非专业人员使用，各类子程序（60余个）设计细致，操作方便；可通用于大震现场和日常震情分析预报，工程地震和小区域地震台网分析，以及地震科研工作。     

地震预报中地电阻率高精度计算方法

本文利用回归分析、谐波分析和预测、理论研究了从大地电位差(Vsp)和人工电位差(ΔV)迭加的合成势差(E)中高精度分离ΔV的方法。实际计算表明:当Vsp变化规律较强时,该方法的精度比常规方法提高几倍至十几倍;当Vsp变化规律较弱时,该方法的精度一般高于或接近于常规方法的精度。