土壤中铁元素对铬元素p-XRF测定准确度的影响与校正   总被引：3，自引：0，他引：3  

唐晓勇  倪晓芳  商照聪 《岩矿测试》2020,39(3):467-474

便携式X射线荧光光谱仪（p-XRF）能够快速检测土壤中的铬元素,但由于土壤成分复杂、基体效应不明,导致其检测准确度较低。铁元素作为土壤基体中的主量元素,在不同类型土壤中含量变化范围大,是影响铬元素p-XRF测定准确度的主要元素之一,深入研究铁元素对铬元素荧光强度的影响有助于提高p-XRF测定土壤中铬元素的准确度。本文以人工配置的铬-铁土壤样品研究铬元素荧光强度与铬元素含量和铁元素含量的变化关系,采用经验公式校正铁元素对铬元素p-XRF分析准确度的影响。结果表明：土壤样品中的铁元素含量固定不变时,铬元素的含量与其相应的特征X射线荧光强度呈线性变化,相关系数均在0.9990以上,且铬元素荧光强度的增长速率随着土壤中铁元素含量的增加而增大;另外通过对同一铬含量、不同铁含量土壤样品的研究,验证了铁元素对铬元素的荧光增强效应,并发现该增强效应还与铁、铬元素的相互作用有关。结合铬、铁元素基体效应研究结果,本文建立了铁元素对铬元素p-XRF测定的校正方程式,相比于普通的线性回归,该方法的相关系数从0.9011提高到了0.9986,硅藻土样品的p-XRF分析平均相对误差从21.94%下降至2.52%,实际土壤样品的p-XRF分析平均相对误差从51.02%下降至5.21%。  相似文献   

便携式伽玛全谱测量仪在环境工程中的初步应用研究     

吴允平  贾文懿  方方  乐仁昌  祖秀兰  王小琴 《物探化探计算技术》2000,22(2):184-188

作者简述了放射性测量的基本原理以及 CD- 1 0型便携式伽玛全谱测量仪的体系结构及其应用软件结构 ,介绍采用便携式伽玛全谱仪在某地环境工程中的初步应用  相似文献   

Can sand dunes be used to study historic storm events?          下载免费PDF全文

Mark D. Bateman  Greg Rushby  Sam Stein  Robert A. Ashurst  David Stevenson  Julie M. Jones  W. Roland Gehrels 《地球表面变化过程与地形》2018,43(4):779-790

Knowing the long‐term frequency of high magnitude storm events that cause coastal inundation is critical for present coastal management, especially in the context of rising sea levels and potentially increasing frequency and severity of storm events. Coastal sand dunes may provide a sedimentary archive of past storm events from which long‐term frequencies of large storms can be reconstructed. This study uses novel portable optically stimulated luminescence (POSL) profiles from coastal dunes to reconstruct the sedimentary archive of storm and surge activity for Norfolk, UK. Application of POSL profiling with supporting luminescence ages and particle size analysis to coastal dunes provides not only information of dunefield evolution but also on past coastal storms. In this study, seven storm events, two major, were identified from the dune archive spanning the last 140 years. These appear to correspond to historical reports of major storm surges. Dunes appear to be only recording (at least at the sampling resolution used here) the highest storm levels that were associated with significant flooding. As such the approach seems to hold promise to obtain a better understanding of the frequency of large storms by extending the dune archive records further back to times when documentation of storm surges was sparse. © 2017 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd.  相似文献   

基于单片机的多功能手持GPS定位仪的设计     

陈赛  李建朝 《测绘工程》2012,21(4):57-60

介绍基于STC89C52单片机下的GPS信息的接收及输出显示,并利用SD卡对导航数据进行保存。采用GPS模块接收卫星信号,通过串口连接,既可通过单片机处理,然后在TFT彩屏上显示相关信息,也可与PC机通信,通过PC机应用软件显示GPS信息,也可通过PC版灵图电子地图实现实时导航。将SD卡保存的数据经GPSBabel软件转换,在googel earth地图上实现轨迹重现。实际应用效果表明,该设计合理有效,具有很高的实用价值。  相似文献   

PC-2000型活性炭氡测量仪   总被引：2，自引：2，他引：0  

汤三星 《地球物理学进展》2004,19(4):751-755

PC--2000型活性炭氡测量仪是由便携式工控机支持的用于测量活性炭吸附氡子体γ的高科技新产品：本文介绍了PC-2000型活性炭氡测量仪的用途、结构、原理、技术性能与使用方法。  相似文献   

20kg级便携式自主水下机器人(AUV)设计与实现     

王芬清  何波  张洪进 《中国海洋大学学报(自然科学版)》2011,(Z2):183-188

便携式AUV具有结构紧凑、机动性好、制造和使用成本低等优点,本文设计AUV的底层控制系统和自主导航系统,并进行仿真验证和人工湖试验,结果证明底层控制系统具有很好的鲁棒性,基于AHRS、数字罗盘和GPS的惯性导航算法能够通过浅水节点潜航方式实现AUV自主导航。  相似文献   

新型便携式海水重金属元素现场测量仪研究     

高杨  刘孟德  刘岩  朱洪海  王小如 《海洋技术学报》2008,27(3)

介绍了一种新研制的现场测量用小型质谱仪,该仪器能够用来监测水体中的痕量重金属元素如铅(Pb)、铬(Cr)、镉(Cd)、铜(Cu)、铁(Fe)以及砷(As)等,对水质环境污染的现场、实时、连续监测具有重要意义.  相似文献   

近景摄影测量中活动控制系统的设计与实现     

马丽霞  王凤艳  张元元 《世界地质》2013,32(3):612-617

应边坡岩体结构面几何信息测量的需要,设计并制作了一套活动控制系统。经过实验验证,制作的活动控制系统结构稳定,携带方便,控制点成像清晰,活动控制架在室内的控制点点位中误差为 ± 2 mm,在野外环境下控制点点位中误差为± 3. 5 mm。可为近景摄影测量提供快速有效控制,满足近景摄影测量中被测目标测量的精度需要,可作为近景摄影测量获取低矮边坡岩体结构面信息的有效控制。  相似文献   

便携式X荧光分析仪在萤石矿勘查中的应用   总被引：1，自引：0，他引：1  

张鹏  张寿庭  邹灏  方乙  曹华文  高永璋  马永非 《物探与化探》2012,(5):718-722

在赤峰市林西县水头萤石矿区,利用便携式X荧光分析仪对第四系浅覆盖区进行隐伏萤石矿体探测的有效性试验。通过测量数据分析及与已知矿体的对比证明,在浅覆盖区利用X荧光分析仪勘查隐伏萤石体是有效的。该结论为便携式X荧光仪在勘查隐伏萤石矿体中的应用提供了重要依据。  相似文献   

The potential of portable luminescence readers in geomorphological investigations: a review     

Kennedy Munyikwa  Tim C. Kinnaird  David C.W. Sanderson 《地球表面变化过程与地形》2021,46(1):131-150

The development of functional portable optically stimulated luminescence (OSL) readers over the last decade has provided practitioners with the capability to acquire luminescence signals from geological materials relatively rapidly, which allows for expedient preliminary chronostratigraphic insight when working with complex depositional systems of late Quaternary age. Typically, when using the portable OSL reader, infrared (IR) or blue post-IR OSL signals are acquired from bulk unprocessed materials, in contrast to regular luminescence dating, which is usually based on measurements on pure quartz or feldspar mineral separates, or on select silt-sized polymineralic portions. To demonstrate the utility of portable OSL measurements, this paper outlines the basic features of portable OSL readers and their constraints. Subsequently, case studies in which the instrument has been used to elucidate cryptostratigraphic variations in sedimentary sequences for geomorphological applications are reviewed. The studies can generally be grouped into three main categories. The first includes studies where the variation of portable OSL reader luminescence signal intensities with depth are plotted to generate profiles that contextualize sediment stratigraphy. In the second group, portable OSL reader luminescence signal intensities are used to interpret sediment processes that shed light on depositional histories. In the last category, luminescence signals from the portable OSL reader are calibrated to approximate numerical burial ages of depositional units. The paper concludes with a discussion of possible future directions. © 2020 John Wiley & Sons, Ltd.  相似文献