共查询到20条相似文献,搜索用时 31 毫秒
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Two different conditioning procedures, one appetitive and the other aversive, were used in separate attempts to demonstrate response to magnetic fields in the goldfish, Carassius auratus. Our results lead us to question those of an orientation experiment by Becker, although we recognize the possibility that goldfish may be sensitive primarily to magnetic field direction rather than intensity and that their directional sensitivity may be evidenced most readily by orientation in the field. 相似文献
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研发了1种可应用于环境监测的微尺度光电检测系统。该系统基于物质吸光理论,以发光二极管(LED)为光发射器件,以光电池为光接收器件.配以适当的检测电路,实现了对溶液锌离子浓度的检测。整个系统具有携带方便、光学元件少、测量精度较高、结构简单紧凑、体积小、成本低廉等优点。通过结构与参量优化设计的初步实验结果表明,微型光电检测系统可以实现溶液浓度的较精确测量,也可用于气体环境因素的检测。 相似文献
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本文探讨了落地原油与大庆草原植被关系,阐明了土壤中石油在2000-4900ng/kg时对羊草植物体中营养物质的合成无影响,且植物体对石油有机污染物有吸收和贮存作用. 相似文献
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水利工程环境影响研究若干问题探讨 总被引:6,自引:0,他引:6
本文简述当代水资源利用和水利工程环境影响研究的发展趋势,总结我国在水利工程环境影响研究上的进步,成绩和不足。着重提出加强水利工程环境影响研究和评价的六点建议:①强调价值观在环境影响评价中的指导作用;②深化和拓宽移民环境容量研究;③加强环境影响的经济评价研究;④开展水利工程环境影响的风险分析;⑤充实环境对策体系研究;⑥积极建立长期定位观测台站。 相似文献
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煤、石油和天然气已成为人们熟悉的"常规能源",大中型水电站利用的水能也早已被列入常规能源的队列.小型水电站则例外,它与核能、风能、生物质能、太阳能、地热能和海洋能一起,被称为"新能源".显然,这是人为的划分.实际上,无论大中型水电站或小型水电站以及其他水能利用方式,都是水能的利用,可以一起讨论. 相似文献
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Carla Ximena Salinas Jon Mendieta 《Mitigation and Adaptation Strategies for Global Change》2013,18(5):551-566
Desertification is considered a global environmental problem with political and socioeconomic implications. Desertification, exacerbated by climate change, is the largest environmental problem in Chile affecting almost two third of the national territory. This study takes place in a latitudinal gradient of the north-central Chilean drylands, where desertification is a threat to agriculture, livestock and forestry (ALF). In the context of the United Nations Convention to Combat Desertification (UNCCD) and the implementation of the Chilean National Action Programme (NAP), the country is conducting policies and investing in mitigation strategies to combat land degradation and desertification. The main objective of this paper is the development of an integrative methodological approach using real data of the territorial and socioeconomic indicators. With the proposed methodology we assess the impact of the mitigation and land degradation strategies supported by the ALF promotion agencies in the fight against desertification, projecting different scenarios of change. The data were collected in 2008 in Santiago, Chile. The results of the Principal Component Analysis (PCA) suggest that technical irrigation and the improvement of grasslands and pastures play an important role in the fight against desertification. The results of the model projections are consistent, suggesting that the efforts of the ALF promotion agencies have a positive impact in fighting desertification. Inaction of ALF mitigation strategies would increase desertification. This methodological approach, performed with real data, is a contribution for the development of integrative assessments, for replication and for forthcoming discussions. 相似文献
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针对我国在用车排放比较严重的现状,我们认为:短期内易于实现,花费不高,不用对现有车辆作重大技术变动的有效措施是完善在用车I/M计划和进行在用国的加速淘汰工作。而且,对于用率和高污染车辆,完善的I/M计划也是更有效控制机动车排放污染所必需的。 相似文献
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中山古称香山,因境内五桂山多奇花异卉,四季飘香得名。今日中山作为珠三角经济快速发展的地区之一,如何破解经济高速发展所带来的环境问题,已成为当地政策和当地环保部门的一项重要工作。 相似文献
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城镇生活污水排入水体,严重影响水资源的使用价值。沙漠地区因缺水,造成许多地方造林失败。本文提出了城镇生活污水就近引灌沙漠造林的构想,从经济和环境影响两个方面将其与传统方案进行了比较,结果表明,新方案优势明显。 相似文献
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应急监测是突发性环境污染事故处置中的首要环节,是对污染事故及时、正确地进行应急处理、减轻事故危害和制定恢复措施的根本依据。文章从制定应急监测预案、加强应急监测能力建设、摸清污染源状况、加强应急培训和应急演练等方面对做好突发环境事件应急监测的快速响应作了简要的阐述,供大家探讨。 相似文献
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Addition of anaerobic tanks to an oxidation ditch system to enhance removal of phosphorus from wastewater 总被引:1,自引:0,他引:1
IntroductionEutrophicationofwaterbodieshasbeenattendedmanyyearsbyscientistsandthepublic .Phosphorusinthewaterbodiesoriginatesfromtheatmosphere,agricultureanddomesticandindustrialwastewater;domesticandindustrialwastewaterbeingthelargestsource .Therefore ,… 相似文献