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旱涝、高温日灼、凤、肥力匮乏、病虫害、草害等各种自然灾害因子,不同程度地影响着果园生产。本文阐述了这些因子的发生特点及对果树的危害,分析了其危害规律,为提高果园管理水平,生产出高产优质果品,应采取的相应的技术措施,提供了理论指导。.3 相似文献
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在传统的防火设计中,设计人员只需要按照规范条文的要求按部就班地进行设计,对于设计所要达到的最终安全水平或目标并不关心。安全目标对设计人员是隐含的,在性能化防火设计中,安全目标是设计人员必须关心的内容之一。安全目标是防火设计应该达到的最终目标或安全水平,除非规范中有明确的规定,一般应该同消防主管部门、建筑业主、建筑使用方共同协商确定。安全目标确定后,设计人员应根据建筑物的各种不同空间条件、功能要求及其他相关条件,自由选择达到防火安全目标应采取的防火措施并将其有机地结合起来,构成建筑物的总体防火设计方案。 相似文献
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基于聚类分析的三江并流区泥石流危险性评价 总被引:2,自引:0,他引:2
三江并流区是一个多民族聚居区,也是我国著名的旅游景区,同时又是典型的生态脆弱区和滑坡泥石流灾害多发区。本文采用聚类分析方法评价了三江并流区泥石流的危险性,这种非监督分类的方法适用于没有足够训练数据的情况,可以快速对一个区域的泥石流危险性进行评估。泥石流危险性评价指标选择了能够反映三江并流区泥石流灾害主控因素的8个影响因子:地形坡度、坡向、植被、地层岩性、断裂带密度、河流切割密度、降雨量和道路网密度。聚类分析算法采用k-means聚类方法,将整个研究区域划分为四个子类,分别对应极低、低、中等和高危险区,其评价结果与研究区泥石流灾害分布的点密度值相吻合。从危险性评价图可以发现,即使在极低危险区域附近,可以看到有高危险区域的存在,因此,这一分区图可以用来寻找危险区中的防灾避灾安置点(即小块的低危险区);从危险性分区图中还可以发现一点,在高危险区域和中等危险区,以及高危险区与极低危险区分界线附近,泥石流灾害点分布比较密集。 相似文献
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蒋毅 《四川职业技术学院学报》2012,22(1):47-49
国家和学校实行新的研究生奖学金制度初衷是为了更好地激励和促进研究生努力学习。然而,事实却与初衷相违背。在研究生奖学金制度运行中出现了功利化倾向、个体间割裂倾向及柠檬市场倾向等道德风险。相应的可以采取奖学金设置差异化、评定多元化及来源渠道广泛化,组织团体活动和交流会,营造一个良好的合作氛围,加强学术成果进入制度建设等措施加以应对。 相似文献
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经理人的道德风险:家族企业如何规避 总被引:3,自引:0,他引:3
刘佑军 《福建师大福清分校学报》2003,(4):19-21,26
家族企业管理层的人力资源是有限的,因此,引进职业经理人便成了大多数家族企业可持续发展的必然要求。但是,由于经理人的道德风险的存在,家族企业便面临着如何规避经理人的道德风险的问题。本文结合我国国情,分析了经理人的道德风险产生的原因。从而提出了家族企业如何规避经理人的道德风险的对策。 相似文献
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Kenneth A. Lachlan - Ken Lachlan is an Assistant Professor in the Communication Department at Boston College Patric R. Spence - Patric R. Spence is an Assistant Professor in the 《Journal of Applied Communication Research》2007,35(1):109-123
This article details the development of a psychometric instrument measuring the constructs of hazard and outrage in the aftermath of Hurricane Katrina. The study focused on the interplay of perceived hazard and outrage in relation to evacuation from the New Orleans area, with specific attention to demographic differences. Perceptions of hazard and outrage during Katrina served to illustrate the utility of the scale in examining these responses across different demographic groups. Possible ways that this information can be used to design messages that alert audiences to hazards, yet successfully address the need for outrage, emerged from the study. 相似文献
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Economic policies are innovations that have important effects on countries and their social welfare. Far from being simply technical in nature, such policies are often ideological innovations. This paper examines three economic policy innovations (privatization, central bank independence, and pension reform) and shows how the diffusion of these policies depended not only upon the mobility of American-trained Ph.D. economists to adopting countries, but also the state of agreement among economists on the value of these policy innovations. By estimating hazard models for adoption times, the effects of mobility and policy agreement are shown to explain the adoption patterns. The implications of this analysis are to treat the creation and diffusion of economic policies as innovations that are subject to trial and error revision as well as to the changing consensus within an academic community. 相似文献
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This article details the development of a psychometric instrument measuring the constructs of hazard and outrage in the aftermath of Hurricane Katrina. The study focused on the interplay of perceived hazard and outrage in relation to evacuation from the New Orleans area, with specific attention to demographic differences. Perceptions of hazard and outrage during Katrina served to illustrate the utility of the scale in examining these responses across different demographic groups. Possible ways that this information can be used to design messages that alert audiences to hazards, yet successfully address the need for outrage, emerged from the study. 相似文献