Results 21 to 30 of about 1,355,674 (190)

过硼酸钠制备的稳定性二氧化氯存在形态的研究

open access: yesGongye shui chuli, 2004
以过硼酸钠为稳定剂制备稳定性二氧化氯溶液(稳定液)。通过对稳定液性质的测定、溶液稳定性试验、纸色谱分析和红外光谱分析,以及在与以过碳酸钠为稳定剂的稳定液作对比分析的基础上,结合配位化学理论,提出在以过硼酸钠为稳定剂的稳定性二氧化氯溶液中ClO2是以活性配位化合物的形式存在,并推测了其可能的分子结构。
贺启环, 潘慧云, 谢慧芳
doaj   +2 more sources

企业排污权交易行为及交易制度稳定性影响

open access: yes财经与管理, 2020
在过去,中国在环境污染物防治方面采取的方式较为单一,主要以政府主导和治理为主,致使企业被动按照指令执行污染物防治。企业排污权的设置坚持以良好的生态环境为导向,排污权交易制度的设置始终以排污企业为主体,既要满足污染物的排放又可以做到合理管控,不造成环境的二次污染。论文通过了解企业排污权交易的概况、发展历程以及应用,分析企业排污权交易制度的构成因素和完善内容。
鸿飞 安
semanticscholar   +1 more source

循环水中锌离子稳定性的研究

open access: yesGongye shui chuli, 2004
研究了循环水中锌离子的稳定性,讨论了磺酸盐共聚物和水质因素对锌离子稳定性的影响。结果表明,随着磺酸盐共聚物ZF322浓度的增大,循环水中锌离子的稳定性增强;三价铁离子、钙离子浓度和碱度的增加都会降低锌离子的稳定性;正磷在低浓度时可增强其稳定性;pH值对锌离子稳定性影响很大,但加入药剂后影响比较小。
秦会敏   +5 more
doaj   +2 more sources

黄芪复方制剂制备工艺筛选及有效成分稳定性研究

open access: yes中医药研究前沿
黄芪复方制剂是以黄芪为主药配伍多种中药材制成的复方制剂,具有益气固表、扶正祛邪功效,临床应用广泛。本文系统阐述黄芪复方制剂的药理作用与临床价值,分析制备工艺优化对制剂质量的重要影响,探讨有效成分稳定性研究的必要性。在此基础上,从提取工艺参数的单因素考察、正交试验法优化提取工艺条件、成型工艺的筛选与验证方面研究制备工艺筛选策略,并从有效成分含量测定方法的建立、影响因素试验与加速稳定性考察、长期稳定性试验及结果分析方面深入探讨有效成分稳定性研究方法,以期为黄芪复方制剂的开发与质量控制提供参考。
Zi-Ye Zhang, Ji-Ping Wang
semanticscholar   +1 more source

Criteria for the existence of nonuniform exponential instability of skew-evolution semiflows in Banach spaces(巴拿赫空间上斜演化半流的非一致指数不稳定性的存在条件)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2016
基于一致指数不稳定的定义,引入了 Banach空间中斜演化半流非一致指数不稳定的概念,并用实例阐释了二者的关系.借助于指数稳定性的研究方法,讨论了斜演化半流非一致指数不稳定的特征,建立了其非一致指数不稳定的2个充要条件.所得结论推广了指数稳定性及一致指数不稳定性中的一些已有结果.
YUETian(岳田), SONGXiaoqiu(宋晓秋)
doaj   +1 more source

Study on the stability and species distribution of inorganic polymer flocculant-polyferric chloride by basification(碱化法制备聚合氯化铁絮凝剂的稳定性和形态分布研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2003
采用碱化法制备高浓度聚合氯化铁工艺得到了不同碱化剂和稳定剂的不同加入时间对形态分布的影响,以及碱化剂加入速度和碱化度对稳定性的影响.研究结果表明:作为碱化剂,NaHCO3优于NaOH;先加入稳定剂的制备方法对提高PFC的稳定性及混凝特性有利;在碱化度B=0.4时制备的PFC稳定性最差.
WANGHong-yu(王红宇)   +3 more
doaj   +1 more source

Conflict Social Networks of Critically Endangered Alpine Musk Deer in Captivity and Relationships With Fecal Steroid Hormones 圈养极危物种马麝的冲突社交网络及其与粪便类固醇激素的关联

open access: yesWildlife Letters, EarlyView.
We conducted a grouping study on 52 adult musk deer to investigate whether group sex composition modulates aggressive behavior and stress response in captive musk deer. We found that the conflict interactions of all‐male groups were significantly more than those of mixed groups, and compared with the mixed groups, the conflict interactions of all‐male ...
Xiaolong Wang   +5 more
wiley   +1 more source

Context‐Dependent Effects of Beavers (Castor spp.) on Freshwater Pearl Mussels (Margaritifera margaritifera) in European Rivers 河狸对欧洲河流中的淡水珍珠贝 (Margaritifera margaritifera) 存在情境依赖性影响

open access: yesWildlife Letters, EarlyView.
The study explores how beavers (Castor spp.) affect endangered freshwater pearl mussels (Margaritifera margaritifera) in European rivers. Beaver dams can harm small, fragmented mussel populations by reducing flow, increasing sediment, and potentially limiting host fish movement, while larger populations may benefit from improved bed stability and ...
Louise Lavictoire   +2 more
wiley   +1 more source

Insights for conservation from the Ecological Knowledge Games project

open access: yesConservation Biology, EarlyView.
Abstract Environmental conservation research requires robust methods for collecting large‐scale behavioral data and engaging diverse stakeholders in decision‐making processes. We (Y.P., A.B.D., and N.B.) created EcoKnowGames (Ecological Knowledge Games), a transdisciplinary project that develops knowledge games for conservation science and data ...
Yuan Pan   +4 more
wiley   +1 more source

稳定性二氧化氯的热稳定性及活化效果研究

open access: yesGongye shui chuli, 2004
对稳定性二氧化氯(ClO2)的热稳定性及酸度对活化效果的影响进行了研究,并与亚氯酸盐(NaClO2)水溶液进行了对比;对稳定性ClO2活化后对细菌和乙肝表面抗原HBsAg的灭活效果进行了研究。结果表明:稳定性ClO2水溶液不同于NaClO2水溶液,其热稳定性好于NaClO2,盐酸的活化效果好于柠檬酸。
王丽
doaj   +2 more sources

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