期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
青岛近海沉积物PCBs的水平与垂直分布及贝类污染 被引量:32
1
作者 杨永亮 潘静 +4 位作者 李悦 石磊 殷效彩 李凤业 kevin jones 《中国环境科学》 EI CAS CSSCI CSCD 北大核心 2003年第5期515-520,共6页
利用13C 同位素内标法及气相色谱-质谱方法对青岛胶州湾内外8个表层沉积物,1个沉积物柱状岩心和2个贝类样品中包括14种共平面PCBs在内的50种PCBs同系物含量进行了测定,在所有样品中均检测出了PCBs化合物.讨论了PCBs的分布特征.表层样品... 利用13C 同位素内标法及气相色谱-质谱方法对青岛胶州湾内外8个表层沉积物,1个沉积物柱状岩心和2个贝类样品中包括14种共平面PCBs在内的50种PCBs同系物含量进行了测定,在所有样品中均检测出了PCBs化合物.讨论了PCBs的分布特征.表层样品以胶州湾东岸的含量最高,从北岸、西岸、胶州湾口及胶州湾外PCBBs含量逐渐降低.表层沉积物中总PCBs含量在0.65~32.9ng/g dw.PCBs总含量落在国内外海洋近岸表层沉积物含量范围的中值区.表明污染来源有城市污水排放及大气来源2种,而不属于工业污染类型.多氯联苯主要以低氯取代PCBs为主,大部分高氯取代PCBs的含量低于检出限.柱状样中共平面PCBs的含量及毒性当量浓度总的垂直变化趋势是从1951年到现在逐渐减少.贝类样品的总PCBs含量为4.9~8.4ngg/g dw,属低污染水平. 展开更多
关键词 多氯联苯 共平面多氯联苯 沉积物 贝类 胶州湾
在线阅读 下载PDF
南四湖沉积物中二噁英类化合物的分布 被引量:10
2
作者 杨永亮 史双昕 +7 位作者 潘静 李红莉 李国刚 高虹 周成 李悦 石磊 kevin jones 《环境化学》 CAS CSCD 北大核心 2004年第5期549-555,共7页
用1 3C同位素内标法 ,高分辨率气相色谱 高分辨率质谱对南四湖表层沉积物中 1 7种含 2 3 7 8 氯代二苯并二英 /呋喃 (PCDD/Fs)及 1 2种共平面多氯联苯 (Co PCBs)的含量、同系物异构体的分布特征、沉积通量、毒性当量及来源进行了初... 用1 3C同位素内标法 ,高分辨率气相色谱 高分辨率质谱对南四湖表层沉积物中 1 7种含 2 3 7 8 氯代二苯并二英 /呋喃 (PCDD/Fs)及 1 2种共平面多氯联苯 (Co PCBs)的含量、同系物异构体的分布特征、沉积通量、毒性当量及来源进行了初步分析 ,并与山东近海 (日照、烟台、青岛 )的测定结果进行比较 .总Co PCBs含量分别为 5 4 4pg·g- 1 dw (南阳湖 )和 41 4pg·g- 1 dw (微山湖 ) .总PCDD/Fs含量分别为 1 0 6 7pg·g- 1 dw (南阳湖 )和1 47 0pg·g- 1 dw (微山湖 ) .两湖含 2 3 7 8 PCDD/Fs异构体对总毒性当量浓度的贡献基本相同 ,即以四—五氯代异构体为主 .PCDD/Fs含量次序为青岛 >日照 >南四湖 >烟台 .南四湖、日照、烟台近海沉积物中的PCDD/Fs对总TEQ (PCDD/F TEQ +PCB TEQ)的贡献为68 8%— 93 0 % .南四湖与山东近海沉积物中PCDDs/PCDFs比值和OCDD %∑百分比表明 ,山东省PCDD/Fs的来源较为一致 ,相对恒定 .除河口处外 ,大气沉降应是南四湖及山东近海PCDD/Fs的主要来源 . 展开更多
关键词 PCDD 含量 类化合物 烟台 比值 异构体 测定结果 二噁英 毒性当量 南四湖
在线阅读 下载PDF
中国与英国儿童对待欺负问题态度的比较研究 被引量:11
3
作者 纪林芹 张文新 +1 位作者 kevin jones Nannette Smith 《心理与行为研究》 2003年第2期122-127,共6页
采用修订的Olweus欺负问卷,对中国和英国近万名(中国8937名,英国1035名)中小学儿童对待欺负的态度进行调查。结果发现:(1)中国儿童对待欺负的态度比英国儿童积极。(2)儿童对待欺负问题的态度存在性别和年龄差异。女孩比男孩对待欺负的... 采用修订的Olweus欺负问卷,对中国和英国近万名(中国8937名,英国1035名)中小学儿童对待欺负的态度进行调查。结果发现:(1)中国儿童对待欺负的态度比英国儿童积极。(2)儿童对待欺负问题的态度存在性别和年龄差异。女孩比男孩对待欺负的态度较积极;小学儿童对待欺负的态度比初中儿童积极。(3)儿童在欺负/受欺负关系中的角色与其对待欺负问题的态度有联系。未参与者对欺负的态度最积极,其次是受欺负者、欺负/受欺负者,而欺负者对待欺负的态度最消极;(4)儿童对受欺负者的同情多,而去帮助受欺负者的行为倾向少。 展开更多
关键词 欺负 受欺负 态度
在线阅读 下载PDF
Case Study of a Cyber-Physical Attack Affecting Port and Ship Operational Safety
4
作者 Kimberly Tam Rory Hopcraft +6 位作者 Kemedi Moara-Nkwe Juan Palbar Misas Wesley Andrews Avanthika Vineetha Harish Pablo Giménez Tom Crichton kevin jones 《Journal of Transportation Technologies》 2022年第1期1-27,共27页
As the maritime sector embraces more technology to increase efficiency, lower carbon emissions, and adapt to meet modern challenges, cyber and cyber-physical safety become a more significant issue. However, unfortunat... As the maritime sector embraces more technology to increase efficiency, lower carbon emissions, and adapt to meet modern challenges, cyber and cyber-physical safety become a more significant issue. However, unfortunately, much of past research view cyber-security issues in transportation as primarily information technology problems. This paper designs and uses a case study to illustrate how cyber-security and physical safety should be viewed together, cyber and physical (</span><i><span style="font-family:Verdana;">i.e.</span></i><span style="font-family:Verdana;"> cyber-physical), when considering ship-to-ship</span></span><span style="font-family:Verdana;"> and ship-to-shore interactions. While there is some scenario designing, this case study is built with real port data and ship systems to demonstrate a real-world cyber-attack on a ship. It shows plausible physical effects that affect the safety of those involved. This case study is also made realistic with a novel hybrid cyber range and hardware testbed environment, designed to examine the different effects a ship-based cyber-attack could potentially have on a port. This informs several solutions, technical and social, that could enhance cyber-physical safety in marine transportation. 展开更多
关键词 Cyber-Physical Security Safety PORT Cyber Range CYBERSECURITY
在线阅读 下载PDF
为Java打造更好的XML API
5
作者 kevin jones 绯雨闲丸 《程序员》 2002年第6期83-85,75,共4页
JDOM API为Java提供了使用XML最好的工具。在这篇文章中,让我们来一起认识一下JDOM。
关键词 JAVA语言 面向对象 程序设计 XML API
在线阅读 下载PDF
Building the new international science of the agriculture-food-water-environment Nexus in China and the world
6
作者 Xinguang Zhu Martin Parry +17 位作者 Yonglong Lu Matthew Heard Guangguo Ying Simon Vaughan Jianbo Shen Alan Jenkins Yunpeng Wang Silvia Lacorte Tingping Ouyang Francisco Pedrero Salcedo Jun Niu John Quinton Chunling Luo Fusuo Zhang Gan Zhang William Davies kevin jones David Tyfield 《Ecosystem Health and Sustainability》 SCIE 2016年第11期2-8,共7页
The multiple,complex and systemic problems of the agriculture-food-water-environment nexus(“Nexus”)are among the most significant challenges of the 21st century.China is a key site for Nexus research amidst profound... The multiple,complex and systemic problems of the agriculture-food-water-environment nexus(“Nexus”)are among the most significant challenges of the 21st century.China is a key site for Nexus research amidst profound socio-environmental problems.The policy implications of these problems have been authoritatively summarized elsewhere.This study presents discussions at an international workshop in Guangzhou that asked instead“What science is needed to deliver the growing policy commitments regarding these challenges?And,What changes are needed to the science itself?”Understanding and effective intervention regarding the Nexus calls for a paradigm shift:to a new kind of science of(capacity for)international,interdisciplinary,and impactful research working with and within complex socio-natural systems.We here argue that science must become proactive in approach,striving only for“minimal harm”not“silver bullet”solutions,and adopting an explicitly long-term strategic perspective.Together,these arguments lead to calls for reorienting science and science policy in three ways:from short-term remediation to longer-term optimization;from a focus on environmental threats to one on the opportunities for international collaborative learning;and toward supporting new forms of scientific career.We bring these points together by recommending a new form of scientific institution:a global network of collaborative Nexus Centres,under the umbrella of a global Food Nexus Organization akin to those of the human genome and proteome. 展开更多
关键词 agriculture-food-water-environment Nexus China complex systems food security international col-laboration new science.
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部