共查询到20条相似文献,搜索用时 109 毫秒
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以油品泄漏为风险类型,从油品泄漏的途径、扩散范围和环境敏感性出发,在优化风险分级评价指标的基础上,重点考虑事故的环境危害后果,建立了包括事故概率、环境敏感性、事故源强及环境危害后果的指数综合评价法。通过现场评价及验证结果表明:该方法可解决现有环境风险评价方法中对事故的环境危害后果评价不足的问题;其事故概率评价指标体系为可选矩阵,可识别不同环境敏感区的主要因素,对我国长输管道事故管理具有较强的针对性。此外,该评价方法所需参数与野外现场结合紧密,具有操作简便、直观和通用性强等特点,可为油品长输管道的环境风险管理提供科学依据。 相似文献
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关于建设项目环境影响回顾评价的几点看法 总被引:2,自引:0,他引:2
本文论述了建设项目环境影响,回顾评价的作用及选择评价内容的原则,并提出环境管理,污染治理措施、环保对策、公众反应等应是回顾评价的重点。 相似文献
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累积环境影响评价中若干问题的探讨 总被引:3,自引:0,他引:3
本文回顾了国内外累积影响评价研究的现状和进展,分析了累积环境影响评价的各种方法,对当前累积环境影响评价研究中存在的问题进行了总结,并对今后的发展方向进行了展望。 相似文献
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对清洁生产示范工程实行回顾性评价和追踪评价制度是一种实施清洁生产的有效办法,通过对绍兴三空印染企业清洁生产示范工程进行回顾评价和追踪评价,表明这种方法有助于全面了解清洁生产示范工程的情况,尤其是了解示范工程的长期效益。 相似文献
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本文回顾了环境影响评价制度的产生和发展过程,指出对环境评价结果进行验证性环境监测是对环境评价制度的重要补充与完善,提出对制定环境评价验证性环境监测的建议。 相似文献
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系统回顾了中国关于湿地景观生态健康2000—2020年的研究进展,指出现有研究在时间尺度和空间尺度上存在的差异;归纳了湿地景观生态健康的主要研究内容;并对湿地景观生态健康的评价方法进行了阐述及对比.最后,根据研究现状提出了展望,认为今后应着重于湿地景观生态健康评价方法和指标体系、研究尺度优化、多学科多领域融合方面的研究... 相似文献
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本文回顾了环境影响评价制度的生产和发展过程,指出对环境评价结果进行验证性环境监测是对环境评价制度的重要补充与完善,提出对制定环境评价验证性环境监测的建议。 相似文献
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本文通过对江西省吉水县坡地资源现状、特点的分析,从未利用坡地、利用不充分坡地、利用不合理坡地3方面对吉水县坡地资源进行了潜力分析,并提出了开发利用坡地资源的途径 相似文献
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将国内旅游流空间模式研究划分为旅游流圈层结构研究、旅游流时空演化规律研究和旅游流空间场效应分析三个阶段的内容,并重点探讨国内旅游流空间场效应研究的现状.通过文献分析,从基本理论、研究方法和存在的问题三个方面对旅游流空间场效应研究的相关成果进行归纳、总结,力求构建一个国内旅游流空间场效应研究的基本框架,以进一步深化对旅游流空间场效应的认识,扩宽国内旅游流空间模式研究的视野. 相似文献
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Hassan Fathabadi 《International Journal of Green Energy》2020,17(7):440-446
ABSTRACTIn this study, the impact of DC electric and magnetic fields on the output power, open-circuit voltage, and photocurrent density of a silicon photovoltaic (PV) cell/module is assessed. In this regard, the influence of DC electric and magnetic fields is first evaluated in theory by formulating and discussing related basis and concepts. Then, experimental measurements and data obtained from two different sets of experiments are given that verify theoretical results. In theory and practice, it is shown that depending on the direction of a DC electric field applied to a silicon PV cell/module, it causes an increase or reduction in the output power and open-circuit voltage of the PV cell/module. In detail, when the DC electric field points in the direction of the junction electric field of the PV cell(s), the output power and open-circuit voltage of the silicon PV cell/module increase, otherwise the output power and open-circuit voltage decrease. Regarding the magnetic field, it is proved that depending on the direction of a DC magnetic field applied to a silicon PV cell/module, different effects are observed. In detail, when the DC magnetic field points along the junction electric field of the PV cell(s), it has no effect on the output power and open-circuit voltage of the silicon PV cell/module. But, the output power and open-circuit voltage of the silicon PV cell/module decrease when the DC magnetic field points in the other directions. Moreover, the reduction in the output power and open-circuit voltage reaches its peak when the DC magnetic field is applied in the direction perpendicular to the junction electric field. 相似文献
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Faezeh Ghanati Parviz Abdolmaleki Majid Vaezzadeh Elham Rajabbeigi Mohammad Yazdani 《The Environmentalist》2007,27(4):429-434
In the present research, the effects of static magnetic field, with or without iron on the growth, the activity of certain
enzymes (like polyphenol oxidase and phenyle alanine ammonialyase), the content of phenolic compounds and the essential oil
composition of sweet basil (Ocimum basilicum) were studied. Treatment of plants with static magnetic field with or without iron led to decrease of the growth of plants
as well as decrease in the activity of phenyle alanine ammonialyase and of phenolic compounds content. In addition in those
plants exposed to magnetic field the amount of essential oils, notably of methyl chavicol, was increased. Exposure of plants
to the magnetic field decreased the activity of polyphenol oxidase, whereas treatment of plants with iron when exposed to
magnetic field increased polyphenol oxidase activity. In this group the content of essential oil was reduced. 相似文献