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The binding of 4 s-triazines herbicides and metabolites, ameline, hydroxyatrazine, atraton, and ametryn to 12 structurally different humic substances
was studied by affinity capillary electrophoresis. Binding data were confronted to the structural data of humic acids obtained
from spectrometric measurements (UV-Vis, FT/IR, NMR), elemental analysis and potentiometric titration. The results obtained
with principal component analysis and partial least square analysis clearly show the importance of carboxylic acidity and
aromaticity of the humic ligands in relation to the partial positive charge and relative hydrophobicity of the pesticides. 相似文献
33.
赵洪发 《防灾科技学院学报》2007,9(3):136-137
本文立足军训大学生思想作风素质的提升,为进一步巩固校园来之不易的军训成果,结合大一新生的军训实际,从思想意识、意志力水平、作风纪律性、生活自立精神等六个方面概括了大学生在军训中的思想和作风收获. 相似文献
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Do employee judgments of their organization's corporate social responsibility (CSR) programs relate to CSR‐specific performance and in‐role job performance? Can middle managers influence the formation of such judgments and what factors might moderate such cascading influences? To answer these yet unaddressed questions, we conduct three studies. Study 1 takes an organizational justice perspective and tests our baseline model. Results show that employees' CSR judgments trigger their affective commitment and performance on extra‐role CSR‐specific behaviors; however, extra‐role CSR‐specific performance is unrelated to in‐role job performance. Study 2 replicates Study 1's findings while, in addition, applies a social information processing approach and offers novel insights by demonstrating the cascading effects of managers' CSR judgments on employee CSR judgments. Investments made in CSR programs in order to improve employee judgments and behaviors may be unsuccessful if employees' CSR judgments are based on social information that remains unchanged. In addition to replicating the findings from studies 1 and 2, study 3 draws from middle management involvement and leadership theories to show that leadership styles and managers' involvement in implementing deliberate strategy can strengthen or weaken these cascading effects. This highlights the important role of middle managers as “linking pins” in the CSR strategy implementation process. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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建筑物火灾中人的疏散方式研究 总被引:4,自引:8,他引:4
基于高层建筑物火灾危害性和高层建筑物火灾疏散的特点,提出疏散方式的类型———疏散至建筑物外安全地和就地避难的疏散方式,并讨论疏散方式确定的方法;针对我国火灾研究的现状,确定模型模拟法为可行之法;讨论模型模拟法确定疏散方式的原理,在模型模拟法中,就危险状态发生时间、疏散开始时间和疏散时间的确定进行了讨论;把疏散方式确定的原理应用于一座20层的宾馆火灾,得出其疏散方式为应在第12层设置避难层。 相似文献
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谈心理健康教育对高职院校学风建设的作用 总被引:1,自引:0,他引:1
目前学风建设在高职院校中多采用以学生为主体、以教师为主导和制度辅助等形式.鉴于学生的从众趋向和群体意识、模仿等对学风建设产生的心理机制的影响,大学生自我发展因素又可能产生相反的问题性影响,心理健康教育可以通过促进学生优良品德的形成,提高学生智力活动和身心素质,对高职院校良好学风的建设有促进作用. 相似文献
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Hideto Tsuji Yoshihisa Echizen Yoshiro Nishimura 《Journal of Polymers and the Environment》2006,14(3):239-248
Amorphous and crystallized poly(l-lactic acid) (PLLA-A and PLLA-C, respectively) films were prepared, and the proteinase K-catalyzed enzymatic degradation of UV-irradiated and non-irradiated PLLA-A and PLLA-C films was investigated for periods up to 10 h (PLLA-A) and 60 h (PLLA-C). The molecular weights of both the PLLA-A and PLLA-C films can be manipulated by altering the UV irradiation time. The enzymatic weight loss values of the UV-irradiated PLLA films were higher than or similar to those of the non-irradiated PLLA film, when compared with the specimens of same crystallinities. UV irradiation is expected to cause the PLLA films to undergo chain cleavage (a decrease in molecular weight) and the formation of C=C double bonds. It seems that the acceleration effects from decreased molecular weight on enzymatic degradation were higher than or balanced with the disturbance effects caused by the formation of C=C double bonds. After enzymatic degradation, a fibrous structure appeared on the spherulites of the UV-irradiated PLLA-C film. This structure may have arisen from chains containing or neighboring on the C=C double bonds, which were enzymatically undegraded and assembled on the film surface during enzymatic degradation. The results of this study strongly suggest that UV irradiation will significantly affect the biodegradation behavior of PLLA materials in the environment. 相似文献
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