排序方式: 共有99条查询结果,搜索用时 0 毫秒
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以专利存续期为专利质量的代理变量,利用Cox PH 生存分析模型对2011—2021年中国、美国、欧洲、韩国和日本5个氢能技术发展重点地区的绿色制氢专利质量进行对比分析;同时,对绿色制氢专利质量的影响因素,包括IPC专利号数量、引用数量、专利权人国籍、技术领域等进行分析。研究结果显示:源自中国的绿色制氢专利中,在中国本土申请的专利质量明显低于在海外申请的专利质量;来源于中国的绿色制氢专利虽然数量最多,但专利质量最差,且与来源于其他国家和地区的专利质量差距十分显著;中国光学领域的绿色制氢专利质量最高,是中国政府发展绿色制氢技术应重点关注的领域。 相似文献
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In this study the moderating role of trust and negative affective associations on the inverse relationship between risk and benefit judgements is investigated. A survey (N = 406) was held in the Netherlands on the public perception of new hydrogen systems, during the time that a demonstration project with hydrogen buses was being undertaken. The data of the survey show that for the group of respondents with a negative evaluation of trust in actors involved, an inverse relationship between risk and benefit judgements can be observed. Furthermore, for the group of respondents that had elicited negative affective spontaneous associations with hydrogen in general, the inverse relationship was also found. The inverse relationship between risk and benefit judgements was not observed in the group not making these spontaneous associations. The strongest negative correlation between risk and benefit judgements was found for those who had a negative evaluation of trust and had elicited negative affective spontaneous associations. In all cases the general affective evaluation of hydrogen systems was the mediating factor in this inverse relationship between risk and benefit judgements. These findings provide evidence for the moderating role of trust and negative affective associations on the observed inverse relationship between perceived benefit and perceived risk. 相似文献
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基于在水介质中Cu2+对H2O2氧化甲基橙有催化作用,文章提出一种测定痕量铜的新方法。在此法中Cu2+的浓度在0.02~1.25(μg/25ml)范围内与ΔA呈线性关系,测得反应表观活化能Ea=36.92kJ/mol。此法可用于自来水和试剂中铜的测定。 相似文献
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把pH值在线监测与药品自动投加系统与已开发的混合呼吸测量仪集成,组成自动呼吸-滴定测量仪,同时测得废水生物处理过程溶解氧(DO)、pH、氧气利用速率(OUR)和质子变化速率(HVR)。分别监测了只投加NH4+-N底物的活性污泥硝化过程和实验室脱氮除碳SBR曝气阶段的DO/pH响应,结果显示,两信号呈一定规律变化,在反应结束时均会出现明显转折点。对比监测只投加NH4+-N及同时投加COD和NH4+-N的间歇实验中OUR/HVR响应的结果表明,COD的存在及碳氮比的改变会导致OUR和HVR曲线形状明显不同,对同一间歇实验,OUR和HVR变化趋势基本一致,均可用于表征过程动力学。研究成果为硝化过程动态响应监测、过程控制和模型模拟提供基础资料。 相似文献
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从生物DNA的角度,提出了供应链DNA的模型,基于模型对供应链重组过程中的企业内部和供应链节点间的流程重组加以论述,通过供应链磷酸二酯键以及供应链氢键的描述,从定性和定量的角度提出了业务流程重组的方法,突出关系重组的重要性,为解决供应链业务流程重组问题提供了新思路。 相似文献
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