共查询到20条相似文献，搜索用时 15 毫秒
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在仪器标定检查工作中,常常会涉及到工作状态的选取问题。工作状态选取是否合适,将直接影响着观测数据的准确性。本文仅介绍笔者在工作中遇到的几种异常情况及通过实验识别仪器正常与否的方法。笔者深感在台站仪器老化日异严重的今天,认真识别仪器性能是否正常的重要性。 相似文献
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煤炭部地质局1987年颂发了煤田测井仪器设备测试细则,细则中明确指出,在放射性仪器散射道线性范围标定时,“双源法由于单源读数的非线性会造成较大误差,一般不应使用。”而用单源法测试,则“由于仪器散射道线性范围较小,允许舍弃零伽玛点,且100伽玛点可以在 相似文献
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ICP—AES仪器装置的新进展 总被引：2，自引：0，他引：2
本综述回顾了近年来ICP-AES仪器装置的新进展,介绍了电荷转移成象器件和中阶梯光栅光谱仪联用、傅里叶变换光谱的应用、样品处理和进样装置的研制及TCP-AES仪器智能化等方面的近期成就。 相似文献
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ＴＭＳ０９７２Ｎ集成电路在测流计数仪器中的应用田文俊，田华（河南省水文水资源总站驻马店分站）利用计算器来作计数显示，这在水文仪器中已屡见不鲜。现介绍一种利用ＴＭＳ０９７２Ｎ计算器芯片组装的测流计数装置。该芯片为美国得克萨斯仪器公司生产的单片８位计算器... 相似文献
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This paper reappraises the seismicity of Algeria and adjacent regions. It presents a general view of the geographical structure, the historical development of the seismological station network, some aspects of the effects of past destructive earthquakes, the state of knowledge of the seismicity and the seismic hazard and risk in the region under survey. Magnitude-frequency relationships for different parts of the region studied are presented as well as magnitude-intensity and intensity-attenuation relationships, semi-empirical formula. It also discusses the macroseismic information, the instrumental data and the social and economic implications of earthquakes in the Maghreb region. 相似文献
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黄土高原陆面过程观测试验的仪器精度和观测误差分析 总被引：1，自引：0，他引：1
利用"黄土高原陆面过程观测试验"2009年定西站的平行对比观测资料,分析了微气象观测仪器的精度和观测误差.结果显示:在大多数情况下,A301P型风杯风速计和HMP45D型温湿传感器对风温湿的观测偏差分别不超过±0.10m.s-1、±0.16℃和±1.00%;107型和109型温度传感器对土壤温度的观测偏差分别不超过±0.1℃和±0.03℃;HFP01型热通量板对土壤热通量的观测偏差不超过±11W.m-2;涡动协方差系统(CAST3+Li7500)观测计算得到的感热、潜热和动量通量的偏差分别不超过±8W.m-2、±8W.m-2、±0.02kg.m-1.s-2.此试验对于大气风速、温度、相对湿度、土壤湿度和温度、地表辐射以及地表通量这些要素的观测,相同型号仪器之间的数据都很一致.并且不同型号仪器进行对比观测风速、土壤温度、净辐射、向下长短波辐射和土壤热通量得到的结果也较一致.结果表明,该试验大多数仪器有比较高的精度,仪器之间也比较一致,观测误差较小,基本能够满足陆面过程观测的要求. 相似文献
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中国煤炭核测井技术发展历程与贡献 总被引：1，自引：0，他引：1
在煤田地质勘探中，采用电测井方法确定煤层有一定的局限性。核测井技术的应用，使测井解释煤层与岩层的可靠性大大提高，扩大了测井的应用范围，充分发挥了钻孔的地质效益，促进了无岩心钻进的开展，对提高勘探质量和速度、降低勘探成本起到了重要作用。随着核测井方法技术不断发展和完善，测井解决的地质问题越来越多，提供的地质资料愈来愈丰富。其中自行研制的高分辨率中子俘获伽马能谱测井系统可以直观地提供地层中常见的10多种元素及其含量，这是测井由定性定厚向定量解释发展的一个飞跃。这项高新技术成果标志着我国核测井技术跻身于世界先进行列。 相似文献
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David M. Pendergast 《Environmental Geology》1990,16(1):67-73
The ancient Maya faced a number of architectural engineering problems that they were unable to solve, except in the short term. Modern expectations for and use of Maya sites pose additional problems, and neither these nor the ancient ones have yet been fully resolved. 相似文献
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针对原子荧光光谱法测试中易出现的仪器不稳、标准工作曲线线性不佳、重现性不好等问题，提出了相应的处理办法。 相似文献
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K. Bouwer Prof. Dr. 《GeoJournal》1985,11(4):307-312
The author outlines the relationships between geography and the study of environmental problems. After WW II when these problems were growing in number and complexity, many geographers turned to the quantitative study of spatial relations and processes, neglecting the ecological aspects of human life on earth. However, recently human and physical geography are turning again to an ecological point of view. In the study of environmental problems, a synthesis of the spatial and the ecological traditions in geography is possible. The spatial aspects of environmental problems and environmental management in a systems-theory framework are the central points in the contribution of geography to an interdisciplinary environmental science. 相似文献
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砷的仪器分析方法新进展 总被引：2，自引：0，他引：2
砷是自然界中广泛存在的一种物质在工业，农业，医药等方面应用很广。笔者着重介绍了近几个来砷的仪器分析方法新进展，主要有光度法，电化学法，原子吸收法等。 相似文献
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Development of Cu and Zn Isotope MC-ICP-MS Measurements: Application to Suspended Particulate Matter and Sediments from the Scheldt Estuary 总被引：1，自引：0，他引：1
Jérôme C.J. Petit Jeroen de Jong Lei Chou Nadine Mattielli 《Geostandards and Geoanalytical Research》2008,32(2):149-166
The present study evaluates several critical issues related to precision and accuracy of Cu and Zn isotopic measurements with application to estuarine particulate materials. Calibration of reference materials (such as the IRMM 3702 Zn) against the JMC Zn and NIST Cu reference materials were performed in wet and/or dry plasma modes (Aridus I and DSN‐100) on a Nu Plasma MC‐ICP‐MS. Different mass bias correction methods were compared. More than 100 analyses of certified reference materials suggested that the sample‐calibrator bracketing correction and the empirical external normalisation methods provide the most reliable corrections, with long term external precisions of 0.06 and 0.07‰ (2SD), respectively. Investigation of the effect of variable analyte to spike concentration ratios on Zn and Cu isotopic determinations indicated that the accuracy of Cu measurements in dry plasma is very sensitive to the relative Cu and Zn concentrations, with deviations of δ65Cu from ?0.4‰ (Cu/Zn = 4) to +0.4‰ (Cu/Zn = 0.2). A quantitative assessment (with instrumental mass bias corrections) of spectral and non‐spectral interferences (Ti, Cr, Co, Fe, Ca, Mg, Na) was performed. Titanium and Cr were the most severe interfering constituents, contributing to inaccuracies of ?5.1‰ and +0.60‰ on δ68/64Zn, respectively (for 500 μg l?1 Cu and Zn standard solutions spiked with 1000 μg l?1 of Ti or Cr). Preliminary isotopic results were obtained on contrasting sediment matrices from the Scheldt estuary. Significant isotopic fractionation of zinc (from 0.21‰ to 1.13‰ for δ66Zn) and copper (from ?0.38‰ to 0.23‰ for δ65Cu), suggest a control by physical mixing of continental and marine water masses, characterized by distinct Cu and Zn isotopic signatures. These results provide a stepping‐stone to further evaluate the use of Cu and Zn isotopes as biogeochemical tracers in estuarine environments. 相似文献
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