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外来物种入侵的生态危害 总被引:2,自引:0,他引:2
韩国君 《白城师范学院学报》2006,(4)
外来物种是指某种生物从原来的分布区域扩展到了一个新的地区,在新的区域里进行繁殖扩散并维持下去。这些外来物种会对入侵地的生态环境及生物多样性造成极其严重的威胁和破坏。 相似文献
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杨贵昌 《南京邮电大学学报(社会科学版)》2002,4(3):79-81
“官本位”意识的产生与封建等级制度密切相关 ,其思想基础就是封建等级观念。“官本位”意识是官僚主义、形式主义的思想根源。要刹住官僚主义、形式主义这两股歪风 ,必须采取有力措施消除“官本位”意识 相似文献
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郭宁 《上海理工大学学报(社会科学版)》2018,40(1):77-80
有效数字是大学化学实验课程的主要教学内容之一,是培养学生在课程中理解并在日常学习与工作中规范使用有效数字,提升其对有效数字与测定误差之间关系的认识水平,树立良好规范的数字记录习惯,具有十分重要的现实意义。论述介绍了目前大学化学实验教学中关于有效数字方面存在的主要问题,并采用相应的举措建立和完善了教学方案以利于更好地解决存在的问题。通过几个学期的教学实践发现新教学方案取得了初步的成效,同时严格按照有效数字的要求记录与计算数据也是培养学生具有严谨科学素养的一条重要途径。 相似文献
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In analyzing data from unreplicated factorial designs, the half-normal probability plot is commonly used to screen for the ‘vital few’ effects. Recently, many formal methods have been proposed to overcome the subjectivity of this plot. Lawson (1998) (hereafter denoted as LGB) suggested a hybrid method based on the half-normal probability plot, which is a blend of Lenth (1989) and Loh (1992) method. The method consists of fitting a simple least squares line to the inliers, which are determined by the Lenth method. The effects exceeding the prediction limits based on the fitted line are candidates for the vital few effects. To improve the accuracy of partitioning the effects into inliers and outliers, we propose a modified LGB method (hereafter denoted as the Mod_LGB method), in which more outliers can be classified by using both the Carling’s modification of the box plot (Carling, 2000) and Lenth method. If no outlier exists or there is a wide range in the inliers as determined by the Lenth method, more outliers can be found by the Carling method. A simulation study is conducted in unreplicated designs with the number of active effects ranging from 1 to 6 to compare the efficiency of the Lenth method, original LGB methods, and the proposed modified version of the LGB method. 相似文献
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盛劲松 《长江大学学报(社会科学版)》2006,29(1):51-54
精神损害赔偿的主要功能在于填补受害人因此而受到的损害,使其得到抚慰,以便能开始新生活。因此,精神损害赔偿应本着“全面赔偿损害”的原则,不能脱离实际人为地限定数额。 相似文献
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Harm-minimization strategies reduce the experience of gambling-related harms for individuals and those close to them. Most policies and particularly discussions of tool design and implementation fail to involve end users and consider their concerns and needs. This study aimed to investigate the best way to introduce a harm-minimization tool for electronic gaming machines (EGMs) that will maximize the perceived value and subsequent uptake by the intended audience of gamblers. Focus groups were conducted with 31 Australian regular EGM gamblers experiencing a range of gambling problems. Participants were asked their perspectives of a pre-commitment system (features including accessing activity statements, setting limits, viewing dynamic messages, taking breaks), including concerns, and how to enhance perceived value and usefulness. Positive attitudes about the system were expressed; however, many gamblers saw the tool as relevant only for problem gamblers. Participants indicated that value could be enhanced by making the system flexible and customizable, but still easy to use. Design and implementation strategies such as incorporating flexibility in features, ease of use, appropriate terminology, and educational efforts may address gamblers’ concerns, particularly regarding privacy and potential stigma. This would enhance user perception of harm-minimization tools as relevant and may subsequently enhance effectiveness. 相似文献
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Tonimarie Benaton Tamsin Bowers‐Brown Thomas Dodsley Alix Manning‐Jones Jade Murden Alexander Nunn 《Children & Society》2020,34(5):337-353
The proportion of young people taken into the care of the state has increased recently and there is evidence that this social group suffer negative long‐term outcomes that might be conceptualised by the emergent criminological category of ‘social harm’. Debates in social work around an ethics of care and justice offer different ways of thinking about responding to social harm. This paper reports findings from an innovative arts‐based intervention with Looked After Children and young people and concludes that holding these competing value sets in creative tension is central to the success of the programme in helping young people to cope with and contest social harm. 相似文献