华东东部地区中强地震概率背景及其发震估计   总被引：1，自引：0，他引：1  

门可佩  赵兵 《内陆地震》1993,7(3):279-285

应用数理统计方法,简明地给出了华东东部地区中强地震发震的概率背景,并在此基础上根据可公度性理论讨论了今后M≥5、M≥6级地震的危险性,估计该区在1993、1996年前后有可能发生5级以上地震,而且1996年前后发生的有可能是6级以上地震。  相似文献   

异常气候对高寒区杏树生产的影响及对策          下载免费PDF全文

徐向东  孟荣贵  谢树军 《山西气象》2004,(3):21-22

杏树是雁北高寒区主栽果树品种之一，也是当地农民脱贫致富的重要收入来源。异常气候是影响当地杏树栽培优质丰产的主要障碍因素。通过近年来山西省阳高县异常天气对杏树生产的影响的分析调查，提出了相应的生产管理措施，对高寒区杏树优质丰产具有一定的指导意义。  相似文献   

秦岭东段主要类型金红石矿床的稀土元素地球化学特征     

李博昀  钱自强 《化工矿产地质》1997,19(1):26-30

秦岭东段主要原生金红石矿床均受不同程度的变质作用形成。通过对该区四种主要金红石矿床稀土元素地球化学特征的分析及对含矿原岩的恢复，认为本区不同类型金红石矿床的∑ＲＥＥ、ＬＲＥＥ／ＨＲＥＥ、δＥｕ值等特征有很大差别，并显示出了本区金红石矿床成因的多样性和复杂性；稀土元素与Ｔｉ的富集关系的研究结果表明：任何一种类型矿床中，稀土越富集，轻、重稀土分异程度越高，δＥｕ值越大，越有利于Ｔｉ的富集。  相似文献   

Enzymatic and Microbial Degradation of Organic Matter in Lake Hongfeng, Guizhou Province, China   总被引：1，自引：2，他引：1  

梁小兵  朱建明  刘丛强  魏中青  汪福顺  万国江  黄荣贵 《中国地球化学学报》2004,23(1):81-88

1IntroductionEnzymaticandmicrobialdegradationoforganicmatterhasabearingnotonlyonearlydiagene sis,butalsoonelementcyclingandmicrobedistributioninlakesediments.Somereportsshowedtheabundancevariationsoforganicmatterinsediments (BurdigeandGardner,1998;ArthurandDean ,1998;WanGuojiangetal.,2 0 0 0 ) .However,duetothecomplexchemicalcompositionoforganicmatter,mechanismsofenzymaticandmicrobialdegradationandvariationsofeachchemicalcomponentneedtobestudiedfurther.Underanoxiccondition ,SO2 -4 isanimpo…  相似文献   

Environmental records of carbon in recent lake sediments   总被引：4，自引：0，他引：4  

陈敬安  万国江  汪福顺  D.D.Zhang  黄荣贵  张峰  R.Schmidt 《中国科学D辑(英文版)》2002,45(10):875-884

Based on careful sampling and accurate analysis of recent sediments in Lake Chenghai, this paper discusses the staggered positive/negative correlation between organic carbon (OC) concentration and inorganic carbon (IC) concentration. The result indicates that temperature change, and its induced relative changes are the main factors affecting the relationship between IC concentration, δ¹³C of carbonate and OC concentration. When temperature and its induced photosynthesis strength change control autochthonous calcite precipitation, OC concentration is positively correlated with IC concentration and δ¹³C of carbonate. When temperature and its induced physical/chemical changes dominate, OC concentration displays negative correlation with IC concentration and δ¹³C of carbonate. IC concentration and δ¹³C of carbonate in sediments of Lake Chenghai are good proxies for climatic warm/cold changes.  相似文献   

华北中强地震前Morishita播散指数空间演化特征及其应用     

孟保成  孙瑞玲  包淑娴  苏莉华  邵玉华  张香荣  张亚琳 《华南地震》2002,22(1):48-56

研究了华北中强地震前3年Morishita播散指数的空间演化，发现Iδ异常几乎都是首先在远离震中的地方出现，并逐步向未来震中集中，这种规律可为地震的地点预报提供重要信息。  相似文献   

地质图形处理系统设计   总被引：5，自引：0，他引：5  

萨贤春  门桂珍 《煤田地质与勘探》1997,25(2):21-24

介绍了地质图形计算机处理系统的系统功能、系统结构、图形数据库结构以及图形生成与编辑;讨论了在开发地质图形计算机辅助设计或绘图系统时,应如何体现专业特点,如何在数据中表达地质现象的地层和构造意义,如何在地质模型建立中融入专业人员的地质背景知识,以及怎样设计出实际有效的地质图形处理软件系统等问题。   相似文献   

Analysis of the goodness of empirical approaches in predicting explosive detonation parameters     

Fernando?G.?BastanteEmail authorView author&#;s OrcID profile  Elena?Alonso  María?Araújo  Julio?García Menéndez 《Stochastic Environmental Research and Risk Assessment (SERRA)》2018,32(9):2605-2618

Goodness of empirical models for predicting explosive detonation velocity and pressure was analysed using 3 databases consisting of experimental velocity and pressure measurements for different explosives. The first database was used to estimate experimental errors for detonation velocity and pressure measurements. The second database was used to compare residuals obtained by the experimental models and by various thermochemical codes. Finally, the third database, consisting of some 600 data on 130 explosive substances, was used to estimate residual bias and dispersion resulting from the application of the experimental models. Also analysed was model coherence with the ideal detonation theory. Our main conclusion is that all the models introduce bias in their predictions depending on the density and oxygen balance values of the explosive. Of those analysed, the Xiong model was notable for its good results, with residual dispersion comparable to that obtained from application of the best thermochemical codes. Our results would indicate that the Xiong model is the only model that may be compatible with the ideal detonation theory. The pressure equation derived from the ideal detonation theory and calibrated with experimental data had excellent predictive capacity.  相似文献   

建筑结构基于性能的抗震评估的等ζy延性谱法   总被引：1，自引：0，他引：1  

史庆轩  门进杰 《地震工程与工程振动》2007,27(1):54-58

利用水平地震作用下单自由度体系的运动方程,以屈服承载力系数ζy为参量,推导出适时延性系数动力方程,从而建立了基于屈服承载力系数的延性需求谱。结合结构的非线性静力pushover分析,提出了基于性能的抗震评估方法——等ζy延性谱法。用等yζ延性谱法对一个6层钢筋混凝土框架结构进行了抗震评估,并与非线性时程分析进行了比较。结果表明,用等yζ延性谱法对结构进行抗震性能评估是可行的,并且具有较高的精度。  相似文献   

红枫湖、百花湖沉积物中磷的存在形态研究   总被引：35，自引：1，他引：34  

王雨春  万国江  王仕禄  李社红  黄荣贵 《矿物学报》2000,20(3):273-278

湖泊沉积物中磷存在形态,是理解湖泊系统中磷的生物地球化学循环的重要方面,对研究湖泊富营养化等环境问题具有重要意义。本次工作中,采用连续提取化学分析技术,对红枫－百花尖沉积物中磷的存在形态及其剖面变化进行了研究,磷的存在形态包括：吸附态磷（Ｌｏｓｅｌｙ ｓｏｒｂｅｄＰ）、铁结合态磷（Ｆｅ－ｂｏｕｎｄ Ｐ）、钙结合态磷（Ｃａ－ｂｏｕｎｄ Ｐ）、矿物晶格中结合力强的残留态磷（Ｄｅｔｒｉａｌ－Ｐ）和有机态  相似文献