负载型Au-Ni合金催化剂应用于芳香硝基化合物选择加氢反应(英文)     

魏海生  卫星  杨小峰  银光照  王爱琴  刘晓艳  黄延强  张涛 《甘肃地质》1997,(1):160-167

采用改进的两步还原法制备了SiO2负载的Au-Ni合金催化剂,催化剂中Au-Ni纳米颗粒高度分散于SiO2载体表面.Au-Ni合金催化剂在温和条件下芳香硝基化合物选择加氢反应中表现出比两种单金属催化剂更高的活性和选择性,体现出Au-Ni之间明显的协同作用.其中AuNiSiO2催化剂具有最好的性能,反应70 min,转化率和选择性分别达到90.8%和93.0%.  相似文献   

湘西北上震旦统碳酸盐层序地层     

殷勇  范小林 《西北地质科学》1997,18(2):33-42

碳酸盐层序地层应考虑碳酸盐＂加工厂＂、气候条件、构造背景、沉降速率、与陆地连接情况和底质类型等多种因素。碳酸盐层序地层模式在大多数情况下有别于Ｖａｉｌ的碎屑岩层序地层模式，并且气候条件是一个值得多加考虑的因素。通过不同相区碳酸盐层序地层的划分，笔者建立了研究区上震旦统碳酸盐层序地层模式，即陵山沱期为缓坡背景碳酸盐层序地层模式，灯影期为碳酸盐台地（初始）背景层序地层模式。在高水位体系域中识别出早期高水位体系域和晚期高水位体系域。已识别出浅潮下和环潮坪两种不同类型的副层序旋回。通过层序地层分析，笔者认为陡山沱底部的白云岩属于低水位楔。  相似文献   

供水管渠的地震危险度评价─—以克拉玛依水源系统管渠工程为例     

尹力峰  王坚 《内陆地震》1997,(3)

根据管渠工程的实际需要，通过综合分析计算，实现其地震危险度评价。详细介绍综合分析计算的思路与方法。最后以克拉玛依水源系统管渠工程为例，进一步说明了地震危险度评价的实用化方法，同时提出有待研究的问题．  相似文献   

计算机在无线通讯系统中的抗干扰措施     

曹凤娟  刘民 《东北地震研究》1996,12(3):42-47

针对计算机系统的主要干扰源，结合笔者在实际工作中的体会就计算机在无线通讯系统中的抗干扰问题进行了讨论，并给出了相应的各种抗干扰措施。  相似文献   

北京延庆盆地50万年以来的主要构造事件及年代学的初步研究   总被引：1，自引：0，他引：1  

尹功明  卢演俦 《华北地震科学》1996,14(4):19-30

延庆盆地是一个位于燕山山及脉南京的晚新生代形成的小型断陷盆地，通过对延庆盆地系统的野外调查，根据延庆分协的地貌，只物，断裂活动等特征，初步认为延就分协在过去约５０万年曾发生守三次对盆地地貌和沉积环境演化发生过重要升改变盆地演经过程的重大构造事件。  相似文献   

Variation of the Load/Unload Response Ratio Before the Main Shocks of the Reservoir-Induced Earthquakes     

Chen Xuezhong  Yin XiangchuInstitute of Geophysics  SSB  Beijing  ChinaCenter for Analysis  Predicuon  SSB  Beijing  China 《中国地震研究》1996,(2)

In this paper, the theory of the load/unload response ratio is applied to the prediction of the reservoir-induced earthquakes, and variation of the load/unload response ratio Y preceding the occurrence of main shocks of the reservoir-induced earthquakes in Xinfengjiang, Foziling, Danjiangkou, and Shenwo. The results show that the load/unload response ratio Y rises evidently prior to the main shocks.  相似文献   

Classification of Structure Vulnerability and Evaluation of Earthquake Damage From Future Earthquakes     

Yin ZhiqianInsurute of Enginsering Mechanics  SSB  Harbin  China 《中国地震研究》1996,(3)

In this paper,three problems are studied and their results are presented as follows:(1)classification of seismic vulnerability for existing buildings,(2)dynamic earthquake damage matrix analysis method of buildings,and(3)earthquake damage matrix of building in the year 2000.  相似文献   

Investigation on the Load/Unload Response Ratio With Coda Q-1 as Response     

Chen Xuezhong  Yin Xiangchu  Aki K  Ouyang H  Jin A.  Song Zhiping  and Wang YucangCenter tor Analysis  Prediction  SSB  Beijing  ChinaSouthern California Eanhquake Center  University of Southern California  Los Angeles  USAInstitute of Geophysics  SSB  Beijing  China 《中国地震研究》1996,(4)

The load/unload response ratio YQ with the geophysical parameter coda Q-1 of the crust as response is denned in this study.The variation in YQ-1 before and after the Northridge earthquake of January 17,1994(California)has been investigated by using the data of coda Q-1 with frequencies of 1.5,3.0,6.0,12.0,and 24.0 Hz in the Southern California from 1987 to 1994.It can be found that YQ-1 for coda waves with all frequencies,the frequency of 12.0 Hz excluded,ascended to a certain extent prior to the occurrence of the rnainshock and returned to normality after the main shock.  相似文献   

The Temporal Variation of LURR in Kanto and Other Regions in Japan and Its Application to Earthquake Prediction     

Yin Xiangchu  Chen Xuezhong  Song Ziping  and Wang YucangCenter for Analysis  Prediction  SSB  Beijing  China Institute of Geophysics  SSB  Beijing  China 《中国地震研究》1996,(4)

The temporal variation of LURR(y)for Kanto,Wakayama,and Hugo regions in Japan has been calculated and analysed.The LURR(y)values are significantly higher than 1 before the occurrence of all earthquakes with magnitude M≥6.0 in the Kanto region during the last two decades and the Kobe earthquake(1995-01-17).These results suggest that LURR theory is available for Japan.Recently they-value for Wakayama region has been near 1,while the y-value is remarkably larger than 1 for nearly two years for Kanto.According to these results,it is predicted that a strong earthquake with magnitude of about 6.0 could occur in 1 year or a little longer for in Kanto region or its adjacent regions,but there is little possibility for the Wakayama region.  相似文献   

地震预报新途径的探索     

尹祥础 《内陆地震》1996,10(4):337-341

为了探索地震预报的新途径，本文分析了各种现有主要地震前兆。尽管它们在地震预报工作中曾经起过并且今后还将继续起着重要作用，但是，这些前兆与地震的发生都不存在唯一性的对应关系。这表明，到目前为止，还没有找出这些地震前兆和地震孕育过程之间真正内在的本质联系。本文从震源介质的固有特征及非线性系统不稳定性问题的本质出发，借鉴经典力学中的量纲分析与现代信息论的概念，提出了一个表征孕震系统不稳定性逼近程度的新的无量纲参数Ｙ，称之为ＬＵＲＲ（加载／卸载响应比）。ＬＵＲＲ定义为式中，Ｘ＋和Ｘ－分别是孕震系统在加载和卸载时的响应率。  相似文献