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CDSN正处在更新换代的重要时期,为了使广大地震研究人员更好地应用CDSN资料,本文详细叙述了更新的CDSN地震事件数据格式,提出了新数据与已发行数据格式相兼容的办法,同时说明了有关格式转换程序的使用方法。 相似文献
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新一代CDSN台站的地震信息管理,采用ORACLE关系数据库系统。该系统主要由ORACLE的核心,SQL*PLUS接口及各种实用程序组成(图1)。台站SUN工作站系统配置的ARS软件,是分析处理数字化地震资料的较为理想的应用软件。支持该软件的就是OR... 相似文献
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陕西交道全新世黄土-黑垆土磁化率的CBD研究 总被引:16,自引:7,他引:9
根据黄士高原中部交道剖面全新世黄土-黑垆土剖面的非磁滞磁化率和CBD提取前后的磁化率、频率磁化率以及热磁分析结果,分析了磁性矿物的种类和磁畴状态,讨论了古土壤的磁化率增强,指出CBD技术强有力的支持古土壤磁化率增强的土壤成因观点.虽然CBD能非常有效地溶解土壤成因的磁赤铁矿,但并不是完全选择性地溶解土壤成因的磁铁矿颗粒.此外,通过对样品CBD处理前后磁化率数据的分析,从土壤化学角度为黄土的风成说提供了新证据。 相似文献
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在CDSN台站用数字滤波方法对数字地震仪进行抑制噪声滤波,方法简单易行。通过震例检验,把本人新创造的滤波器用ARS软件中含有的滤波器相结合,对地震信号的识别有一定的参考意义,有助于提高编辑地震报告的P波利用率。 相似文献
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在对CCDOS汉字操作系统和BASIC语言特点的认真分析和处理后,得到了一个良好的通用菜单驱动程序,它完全可在不加改动或很少改动的情况下应用以汉字CCDOS为操作系统的各种菜单驱动程序中。 相似文献
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兰博集团开发生产的LBD101型康普顿背散射扫描仪(CBS),可以由被测物的单侧进行检查,广泛用于工业领域的无损检测(NDT)和无损评价(NDE)。这种新仪器采用非常简单而紧凑的单源和单探测器系统。其扫描范围为200mm(X向)×200mm(Y向)×100mm(Z向或深度),用自动升降装置可调节检测高度为200mm~2000mm。LBD101优越的技术指标包括:最高的空间分辨率优于0.8mm,最好的密度分辨率约为1%,最小可探测的缺陷体积小于0.6mm3,最小可探测的缺陷大小为0.8,最小可探测裂纹宽度为0.15mm。辐射防护安全性能好,辐射剂量率非常低。本文摘要并详细比较了COMSCAN160和LBD101型CBS扫描仪的性能和主要技术指标。本文列出了设计便携式高分辨率CBS扫描仪的主要技术问题,还给出了实际检测结果 相似文献
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叙述了中国数字地震台网(CDSN)数据管理中心(DMC)的计算机2000年问题(Y2K)的解决情况,着重介绍了为解闷K问题而编制的getdata_new软件的功能,特点,结构和工作原理,并结合几个典型实例,对用法和应用情况进行说明,另外,本文对getdata_new所涉及的部分ASL的程序也作了简介。 相似文献
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CD-300BG工业CT数采系统的设计与实现 总被引:2,自引:0,他引:2
本文主要介绍了基于AT总线的CD-300BG工业CT数据采集系统的体系结构及其工作原理,并对该系统设计进行了较详细的分析和论证,同时也对该系统进行实际使用后的评价。 相似文献
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Carrick M. Eggleston 《Aquatic Sciences - Research Across Boundaries》1993,55(4):240-249
Scanning tunneling microscopy (STM) is used to observe, at the atomic scale, Cr(III) adsorbed to hematite (001) surfaces from aqueous solution. The Cr(III) adsorbates are relatively immobile, but estimated activation energies for surface self-diffusion are lower than those for water or hydroxyl substitution in aqueous Cr(III). Possible causes are effects of STM imaging (artifacts), high ligand-substitution rates for adsorbed species, or participation of substrate Fe (III) ligand exchange. STM imaging of suitable aqueous surface complexes is shown to be feasible, and constitutes a new way to study the relationships between microscopic and macroscopic chemical behavior of adsorbed species in aqueous systems. 相似文献
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利用~(210)Pb、~(137)Cs和~(241)Am计年法测算云南抚仙湖现代沉积速率 总被引:2,自引:0,他引:2
通过对云南抚仙湖沉积物柱芯样品的~(210)Pb、~(137)Cs和~(241)Am测试表明,柱芯剖面上有明显的1963年和1986年~(137)Cs蓄积峰,验证了1975年次级蓄积峰存在的可能性,这些峰形完好的蓄积峰对抚仙湖的现代沉积环境有明显的时标意义。利用~(137)Cs计年法得到抚仙湖沉积物自1963年、1975年及1986年以来到2007年的平均沉积速率分别为0.063g/(cm~2·a)、0.052g/(cm~2·a)和0.039g/(cm~2·a),说明了过去近五十年抚仙湖沉积速率整体上经历了一个由快到慢的过程。借助于~(241)Am的1963年蓄积峰可以提高~(137)Cs计年的准确性。根据~(210)Pb CRS计年模式,计算出每个样品深度所对应的年代,与~(137)Cs计年法比较存在一定的偏差,分析了两种计年方法存在差异性的原因。通过质量深度和年代分析,抚仙湖的沉积速率变化幅度比较大,表明抚仙湖近129年来的沉积环境不稳定,可能与相应历史时期的人类活动有密切的关系。 相似文献
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I. A. Ansari 《洁净——土壤、空气、水》1987,15(2):175-178
This paper deals with the toxicity of sodium nitrite to freshwater fishes, Channa punctatus (BL.) and Mystus (M). vittatus (Bl.) as to determine the acute toxicity. The LC 50 values were obtained by using a static bioassay method for a period of 24, 48, 72 and 96 hour intervals. The LC 50 values of sodium nitrite for C. punctatus were 375, 325, 250 and 200 ppm and for M. (M). vittatus 164, 140, 90 and 64 ppm, respectively. A profuse mucus secretion was evident at higher concentrations as compared to lower ones. The probable causes of mortality of the fishes are also discussed. 相似文献
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《国际泥沙研究》2018,(4)
正Editing Board address:IRTCES, 20 West Chegongzhuang Rd., Beijing 100048, China IJSR is the journal of THE WORLD ASSOCIATION FOR SEDIMENTATION AND EROSION RESEARCH (WASER) and is edited by the International Research and Training Center on Erosion and Sedimentation (IRTCES).Main topics:Fluvial and estuarine processes 相似文献
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The cumulation of chromium(III) and (VI) has been studied in batch cultures of planktonic algae Microcystis incerta, Scedenesmus obliquus, Chlorella kessleri and Chlamydomonas geitleri at different chromium and algal cells concentrations. It has been found that chromium(VI) is practically not cumulated in algae, whereas chromium(III) is very rapidly cumulated in all types of algae investigated. The cumulation factor increases with the decrease of the radius of algae cells and it reaches the value of 106 for Microcystis incerta even after a few hours of contact. The kinetics, the cumulation factors and the capacity of algae to cumulate chromium(III) is practically the same for living as well as for dead cells and therefore it can be concluded that the cumulation of chromium(III) is due predominantly to the chemical sorption on the surface of algal cells. 相似文献
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Recent evaluations of acute and chronical toxicity of arsenic resulted in a reduction of the standard value for total arsenic from 40 μg/L to 10 μg/L in drinking water which will be valid in Germany after a transition period as from January 1996. Arsenic is well known as substance of deep groundwaters, mainly of geogenic origin and normally found as As(III) or As(V). As(V) is well removable by flocculation and filtration after adding iron salts. As(III), however, has to be oxidized first to As(V). Therefore, it is important for treatment techniques to be able to distinguish between As(III) and As(V). A modified determination of As(III) using flow injection analysis was installed and optimized in order to investigate whether As(III) may be oxidized to As(V) by bacteria in natural waters. The results showed that at 4°C, no As(III)-oxidation was observed within 14 days. At room temperature, however, in the bacteria-containing samples, an As(III)-oxidation was found starting after 3 to 7 days. After 14 days, no As(III) was left over. In contrast, in the sterile samples, no As(III)-oxidation could be observed within 14 days. These results demonstrated that microbial processes influence the oxidation of As(III) to As(V) in natural waters. 相似文献