多接收电感耦合等离子体质谱Cu同位素测定中的干扰评估   总被引：15，自引：1，他引：14  

蔡俊军  朱祥坤  唐索寒  李世珍  何学贤 《高校地质学报》2006,12(3):392-397

多接收电感耦合等离子体质谱（MC—ICP—MS）是高精度测定铜同位素的新方法,然而在测定中也可能存在干扰。为此对MC—ICPMS Cu同位素测定中的可能干扰进行了评估。主要包括以下方面的内容：（1）对所用标准物质和试剂进行了纯化,所用标准物质和试剂对Cu同位素的同质异位素干扰可以忽略;（2）运用K和／参数进行了讨论,其中K为样品中的Cu浓度与标准溶液中Cu浓度的比值,f为在一定Cu浓度的标准溶液中干扰信号相对于^63Cu真实信号的比值。理论模拟表明,当K值小于1时,即使在质量为63处的干扰很小,对ε^65 Cu的影响也可能很大;（3）通过对理论模拟结果与实际测定结果的对比,发现对所用的试剂而言质量数为65的干扰可以忽略不计;（4）实际测定结果表明,当样品中Cu的浓度是标样中Cu的浓度的0．5～4倍时,测试获得的样品的ε^65值与其真值在误差范围内一致;（5）对潜在的基质效应重点研究了Fe和Co对Cu同位素测定的影响。实验结果表明,当Fe／Cu〈100,Co／Cu〈7时,Fe,Co不影响Cu同位素比值的测定;（6）10个月的重现性研究结果为ε^65=3．5±1．0（2SD）。该测定值在误差范围内与文献报道的值一致  相似文献   

天津近岸海域大型底栖动物摄食功能群特征及其与环境因子的关系   总被引：1，自引：0，他引：1  

徐飞  王军强  蔡文倩  魏静梅  韩雪萌 《海洋与湖沼》2021,52(1):186-195

摄食功能群是指生态系统中食性相同的生物群落,研究摄食功能群有助于科学评估区域生态健康状况.基于2015年9月、2016年5月和2016年9月的天津近岸海域大型底栖动物调查数据,结合同步获取的环境因子,分析研究区大型底栖动物摄食功能群组成及其变化特征,探究大型底栖动物摄食功能群组成及变化的原因.结果表明,3个航次的大型底...  相似文献   

Win全站仪的历史与影响     

蔡晓江  张晓江 《测绘与空间地理信息》2007,30(2):155-156

介绍W in全站仪的发展历史,同时探讨其对市场各方面的影响。  相似文献   

贵州松桃高地超大型锰矿床绿色勘查探索与实践     

蔡国荣  张遂  沈红钱  曾飞  朱璞  冯开友  覃永印  刘明民  吴应值 《贵州地质》2021,38(2):146-151

本文选择贵州松桃高地锰矿作为研究对象,从实际情况出发,编写了实施方案,在勘查过程中,分别从现场分区规划、道路修筑、生活区、工作区、安全环保文化建设、水资源保护以及固体废弃物管理七个方面进行具体实施,采用"一基多孔"技术,选择环保型清洗液,对开挖的地块进行了复垦复绿工作,整个勘查过程实现了生态环境的保护,环境恢复治理的落...  相似文献   

基于支持向量机的地震事件类型自动识别及应用     

蔡杏辉  廖诗荣  张燕明  陈惠芳  林彬华 《华南地震》2021,41(2):27-35

天然地震与非天然地震自动识别是地震自动编目系统的重要功能之一,是监测数据产出智能化的基础应用.从福建天然地震和人工爆破事件中,提取小波分析特征、P/S震相振幅比、波形能量分布特征,对以上特征组合联合支持向量机进行大批量数据测试分析,研究得出识别效果较好的事件类型判别算法,最优测试识别率为94.5％;采用最优算法研发基于...  相似文献   

Morphodynamics of an Artificial Cobble Beach in Tianquan Bay,Xiamen, China     

SHU Fangfang  CAI Feng  QI Hongshuai  LIU Jianhui  LEI Gang  ZHENG Jixiang 《中国海洋大学学报(英文版)》2019,(4)

By tracking and monitoring the profile configuration, topography, and hydrodynamic factors of an artificial cobble beach in Tianquan Bay, Xiamen, China over three consecutive years after its completion, we analyzed the evolution of its profile configuration and plane morphology, and its storm response characteristics. The evolution of the profile configuration of the artificial cobble beach in Tianquan Bay can be divided into four stages. The beach was unstable during the initial stage after the beach nourishment the profile configuration changed obviously, and an upper concave composite cobble beach formed gradually, which was characterized by a steep upper part and a gentle lower part. In the second stage, the cobble beach approached dynamic equilibrium with minor changes in the profile configuration. At the third stage the beach was in a high-energy state under the influence of Typhoon Meranti, and the response of the artificial cobble beach differed significantly from that of the low-tide terrace sandy beach. Within a short time, there was net onshore transport of cobbles in the cross-shore direction. The beach face was eroded, the beach berm was accumulated, and the slope of the beach was steepened considerably. In the alongshore direction, there was notable transport of cobbles on the beach from east to west along the shore, and the total volume of the beach decreased by 4.5×103 m~3, which accounted for 50% of the total amount of beach volume lost within three years. The fourth stage was the restoration stage after the typhoon, characterized by a little gentler profile slope and the increase in width and the decrease in height of beach berm. Because of the action of waves and the wave-driven longshore current caused by the specific terrain and landform conditions along the coast(e.g., coastal headlands, near-shore artificial structures, and reefs), the coastline of the artificial cobble beach gradually evolved from being essentially parallel to the artificial coast upon completion to a slightly curved parabolic shape, and three distinct erosion hotspots were formed on the west side of the cape and the artificial drainpipe, and the reefs. Generally, the adoption of cobbles for beach nourishment on this macro-tidal coast beach with severe erosion has yielded excellent stability and adaptability.  相似文献   

Mechanism of toppling and deformation in hard rock slope: a case of bank slope of Hydropower Station,Qinghai Province,China     

CAI Jun-chao  JU Neng-pan  HUANG Run-qiu  ZHENG Da  ZHAO Wei-hua  LI Long-qi  HUANG Jian 《山地科学学报》2019,(4)

Recently, various toppling slopes have emerged with the development of hydropower projects in the western mountainous regions of China. The slope on the right bank of the Laxiwa Hydropower Station, located on the mainstream of the Yellow River in the Qinghai Province of Northwest China, is a typical hard rock slope. Further, its deformation characteristics are different from those of common natural hard rock toppling. Because this slope is located close to the dam of the hydropower station, its deformation mechanism has a practical significance. Based on detailed geological engineering surveys, four stages of deformation have been identified using discrete element numerical software and geological engineering analysis methods, including toppling creep, initial toppling deformation, intensified toppling deformation, and current slope formation. The spatial and time-related deformation of this site also exhibited four stages, including initial toppling, toppling development, intensification of toppling, and disintegration and collapse. Subsequently, the mechanism of toppling and deformation of the bank slope were studied. The results of this study exhibit important reference value for developing the prevention–control design of toppling and for ensuring operational safety in the hydropower reservoir area.  相似文献   

气候变化背景下海南东寨港红树林生态系统的脆弱性评估          下载免费PDF全文

颜秀花  蔡榕硕  郭海峡  许炜宏  谭红建 《应用海洋学学报》2019,38(3):338-349

鉴于红树林生态系统对气候变化背景下海平面上升和极端台风事件有高度敏感性,应用1980—2018年的海洋大气观测资料和实地调查数据,分析了海口东寨港地区的海平面、温度和台风最大风速的变化特征,并基于IPCC气候变化综合风险的理论框架,构建了"暴露度-敏感性-适应性"的脆弱性评价指标体系和估算方法,评估了海平面上升和台风事件背景下东寨港红树林生态系统的脆弱性主要特征。结果显示:①东寨港红树林生态系统的致灾影响因子主要为该地区沿海海平面的快速上升,其上升速率可达4. 6 mm/a,远高于全球和中国沿海平均值;其次为1993年之前和2006年之后,在海口地区250 km范围内出现的热带气旋或台风事件;②东寨港红树林脆弱性指数的平均值为0. 31,属于中度脆弱等级,其中三江片区的红树林脆弱性相对最高,演丰片区最低。构建的评价指标体系可较好地反映出海平面快速上升和热带气旋或台风影响下红树林生态系统的脆弱性特征。  相似文献   

Molecular phylogeny and ultrastructure of a new population of Urostyla grandis(Ciliophora,Hypotrichida) from Harbin,China     

CAI Xinglong  CHEN Ying  ZHAO Xiaolu  GAO Jing  Saleh A. AL-FARRAJ  YU Lijie  PAN Xuming  QIU Zijian 《海洋湖沼学报（英文）》2019,(1):256-265

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Spatio-temporal variability of small fishes related with environmental factors in a typical domestic tap water lake,Eastern China     

CAI Xingwei  YE Shaowen  LI Wei  FAN Hourui  LI Zhongjie  ZHANG Tanglin  LIU Jiashou 《海洋湖沼学报（英文）》2019,(1):278-289

The knowledge of prey small ?sh stock, distribution and abundance is necessary to guide stocking of piscivorous ?sh for the biomanipulation in domestic tap water lakes. This study describes the current status of small ?sh community in Kuilei Lake(China), and examines the spatial and seasonal variations of the community in relation to key environmental factors. Based on submerged macrophyte cover and water depth, the lake was divided into ?ve major habitats:(1) macrophyte covered shallow habitat of water depth< 2.00 m,(2) uncovered or less-covered shallow habitat(2.00 m–3.50 m),(3) uncovered medium shallow habitat(3.50 m–5.00 m),(4) uncovered medium deep habitat(5.00 m–6.50 m) and(5) uncovered deep habitat(6.50 m–8.50 m). The abundance and composition of small ?sh were monitored by benthic fykenet sampling from April 2013 to January 2014. A total of 2881 individuals belonging to 5 families and 21 species were collected. Based on their abundance(accounted for 88.96% of the total) and occurrence(more than 33.33%), Acheilognathus chankaensis, Acheilognathus macropterus, Microphysogobio microstomus,Pseudorasbora parva and Rhinogobius giurinus were recognized as dominant small ?sh species. The results of correlation analysis identi?ed that species richness( Sr), Shannon-Wiener diversity index( H′)and Margalef′s richness index( D) were signi?cantly negatively correlated with water depth, but positively correlated with biomass of submerged macrophytes.Redundancy analysis(RDA) revealed that the spatial distributions of most small ?shes were negatively associated with water depth. The details of these ?ndings are bene?cial to understanding the adaptation of the small ?shes in degraded environments, and to developing suitable biomanipulation strategies for the management of ?sh resources and water quality in the lakes along the lower reach of the Changjiang(Yangtze) River basin.  相似文献