排序方式: 共有29条查询结果,搜索用时 156 毫秒
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我国化工产业的不断发展,带动了我国经济的飞速发展,给人们的生活带来了许多便利条件,但是与此同时也对我国的环境造成了严重的破坏,化工生产用到许多化学材料,在生产过程中会产生大量的化学废弃物,对环境的污染造成很严重的影响。我国对化工生产给环境保护造成的影响高度重视,随着绿色化工环保技术的出现,有效解决了化工产业造成的环境污染问题,对我国的环境问题进行了有效的改善,对我国工业的发展具有重要意义。本文针对绿色化工环保技术进行分析,探讨绿色化工环保技术在环境治理中的有效应用。 相似文献
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Yujie Pan Yalan Li Hongxia Peng Yiping Yang Min Zeng Yang Xie Yao Lu Hong Yuan 《Frontiers of Environmental Science & Engineering》2023,17(5):56
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酚类雌激素酶催化降解性的QSAR分析 总被引:1,自引:0,他引:1
以分子电性距离矢量(MEDV-13)和原子类型电拓扑状态指数(ETSI)2种分子结构描述符,分别有效表征了15个酚类雌性激素的分子结构,应用基于预测的变量选择与模型化(VSMP)方法分别建立了该类化合物经辣根过氧化物酶(HRP)催化氧化的速率常数(InkCAT)与分子结构的定量相关模型.以MEDV-13为分子描述符建立的模型显示:影响去除效果的主要结构因素是由5个MEDV描述子表达的5个子结构碎片,即-CH3、-CH2、-O-、-OH和-cCc,以ETSI为分子描述符所建模型表明:影响该反应速率的主要结构因素是由5个ETSI描述子对应的5个子结构碎片,即-CH3、-CH2、-O-、-OH和>C<.所建模型的估计相关系数分别为0.92和0.93,LOO检验相关系数分别为0.84和0.85,表明2种模型均具有良好的估计能力与稳健性,以上结果说明.虽然酚类雌激素的种类、结构多样,但决定其HRP酶催化去除效果的关键结构因素是酚环上所有取代基整体给电子能力的强弱. 相似文献
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根据黄河水资源保护规划的要求,对黄河三门峡库区段水污染物允许排污总量进行计算,在此基础上采用黑箱模型,建立了区域排污与控制河段目标总量之间的输入响应关系,并根据允许入黄量确定对各污染源的排污控制要求,为实施区域环境总量控制奠定基础。 相似文献
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Ting Zhang Heze Liu Yiyuan Zhang Wenjun Sun Xiuwei Ao 《Frontiers of Environmental Science & Engineering》2020,14(3):39
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Roman M. Wittig Catherine Crockford Robert M. Seyfarth Dorothy L. Cheney 《Behavioral ecology and sociobiology》2007,61(6):899-909
Theory predicts that females in species with matrilineal dominance hierarchies should use nepotistic support systems to maintain
their family’s rank. Female Old World monkeys, however, form alliances against other females at surprisingly low rates. Nonetheless,
in many species, females utter threat vocalizations when observing others’ disputes, suggesting that these vocalizations may
function as ‘vocal alliances’. We describe a playback experiment testing the efficacy of vocal alliances in free-ranging female
baboons. Subjects were played the same female’s threat-grunts under three separate conditions: after being threatened by the
signaller’s close relative to mimic kin support, after being threatened by a female maternally unrelated to the signaller
to mimic non-kin support, and after a friendly interaction with the signaller’s close relative as a control. Subjects responded
more strongly to the playback and avoided the signaller and her matrilineal relatives for a longer period of time in kin support
trials than in either non-kin support or no aggression trials. In contrast, there was no difference in subjects’ behaviour
between non-kin support and no aggression trials. These results corroborate observational data showing that vocal support
occurs at a higher rate than physical support in female baboons, and that kin are more likely to provide vocal support than
non-kin. We conclude that vocal support plays a similar role as physical support in the alliances of female baboons. 相似文献
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刘大龙 《环境监测管理与技术》1996,8(5):1-3
论述了环境监测和环境管理的基本属性,认为环境监测从属于环境管理,同时环境管理与环境监测又相互依存。 相似文献
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硝基多环芳烃是一类重要的具有直接致突变性的环境污染物。本文就硝基多环芳烃的致突变性、结构与致突变活性之间的关系方面的研究进展加以综合评述。 相似文献