共查询到20条相似文献,搜索用时 109 毫秒
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本研究以核心分布区黑龙江凉水国家级自然保护区的典型红松林为研究对象,划分为红松天然林、红松纯林和红松针阔叶混交林3种类型,按照立地条件相近或相似的原则,详细调查了不同面积的长期观测固定标准地18块,研究了不同类型红松林下土壤的基础养分在垂直方向的分布异质性.研究结果表明从不同类型的红松林垂直方向分布看,红松天然林土层全氮的含量、红松纯林土层全氮的含量都遵循随着海拔高度的增加而增加的规律.其它各类型红松林不同养分含量只是在小范围呈现此规律,存在异质性.速效钾的含量在任何类型红松林都不曾在规律性,说明不同类型红树林速效钾的含量在垂直分布上的异质性最明显. 相似文献
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本文通过对4个品牌的火锅底料进行砷含量的测定,并且通过实验了解市售火锅料中的砷含量情况。利用原子荧光检测测定制定样品中的砷,1个样品测4次,一共做了16次实验。得到的砷含量线性回归方程为:Y=303.35x-25.9。并且还分别测定出了4种火锅料中的砷含量,分别为A砷含量为0.86 mg/kg,B砷含量为0.52 mg/kg,c砷含量为0.13 mg/kg,D砷含量为0.33 mg/kg。不同品牌火锅料中的砷含量不同,尽量选择正规渠道购买火锅料。 相似文献
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亚硝酸盐与人们的生产生活及个体健康息息相关。本文测定了市售的5种品牌的饮用水中开启不同时间的亚硝酸盐含量并研究了煮沸后放置不同时间、煮沸次数对自来水中亚硝酸盐含量的影响。结果表明,5种品牌的饮用水在刚开启时和开启当天均未检出亚硝酸盐,隔夜和1周后亚硝酸盐含量增高;自来水煮沸后放置时间越长,亚硝酸盐含量越高,煮沸次数越多,亚硝酸盐喊来那个越高。 相似文献
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AbstractAluminium du Cameroun (Alucam) was set up in 1957 as a subsidiary of the French aluminium group Pechiney. Since its creation, the Alucam plant has systematically applied policies that simultaneously integrate economic, social and environmental aspects. The originality of our contribution is that we describe a case where the three elements that make up corporate social responsibility (economic, social and environmental) are intertwined. Although this combination of elements had not formally materialised at the time, the case examined shows early awareness – comparatively ahead of its time and relatively well combined between the 1950s and the 1980s – of the three dimensions of corporate social responsibility. 相似文献
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The deep recession of 1980–1982 caused many companies to face the prospect of large-scale work force reductions. Such cutbacks are costly for both the company and for the individuals affected. This article focuses on the outplacement efforts of the Ravenswood (West Virginia) Works of the Kaiser Aluminium & Chemical Corporation, using them as a model for organizing and managing similar programs. 相似文献
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本文针对某车型设计了一款防撞梁,基于汽车轻量化理念,防撞梁材料采用铝合金。以GB17354-1998为标准,在Hypermesh中建立了防撞梁的有限元模型,调用LS-DYNA进行碰撞仿真,并对仿真结果进行了分析。通过仿真得出防撞梁低速碰撞的变形及位移情况,并对其结构进行了优化,为整个保险杠系统的设计提供依据。 相似文献
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本文从人们日常生活中铝的摄入途径入手,对通过进食、饮水、呼吸等摄入的铝进行了定量评估,指出食源性铝的摄入是人体内铝的主要来源,而且以面食为主的人群摄入的铝接近或超过预警水平。在综合各种研究成果的基础上,简要探讨了铝的安全性及其控制,为进一步研究提供了丰富的、富有参考价值的资料。 相似文献
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探讨如何应用当前的检测标准为食品中含铝添加剂的管理提供更好的技术支持。运用电感耦合等离子体光谱和质谱技术,检测其铝含量,同时比较在不同酸消解体系中对铝含量的测定值产生的影响。结果表明,单一的硝酸体系无法彻底分解样品,必须添加一定量的氢氟酸才能对面制食品中的铝含量作出准确的测算。 相似文献
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《Business History》2012,54(1):183-200
This article examines the evolution of the regulation of takeovers in Britain in the 1950s. Takeovers began in the early 1950s arousing hostility from the authorities which regarded them as undermining economic policy. A series of bids culminating in the struggle for control of the Savoy Hotel in 1953 led to official directives which covertly curtailed the phenomenon by restricting funds for bidders. There was a second wave of bids in the late 1950s following the relaxation of restrictions on bank lending in 1958. The battles for British Aluminium and Watney Mann aroused public interest and put the restriction of takeovers on the political agenda in the run-up to the General Election of 1959. The response was the publication of a set of self-regulatory guidelines by City practitioners, which was ignored. It is argued that this was what the authorities intended since they had come to regard the threat of takeover as a useful discipline on management. 相似文献
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党的十六届六中全会从中国特色的社会主义事业总体布局出发,提出了构建社会主义和谐社会的宏伟目标。社会和谐在很大程度上取决于社会生产力的发展水平,取决于各行业发展的协调性。从铝工业来讲,要实现发展的和谐性,就要在铝工业的各个环节构建和谐的产业链,进行统筹协调发展。 相似文献
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Responses to three different intensity levels of warmth (none, moderate and high) and three different levels of humour were investigated as well as the moderating role of top of mind awareness and degree of product use. Affective responses, attitude towards the advertisement (Aad) and the brand (Ab) and the favourableness of advertisement-related cognitions were enhanced by the use of warmth although the intensity level (moderate versus high intensity) did not seem to matter. As far as humour was concerned, a high-intensity humorous appeal induced most favourable affective responses, Aad and advertisement-related cognitions, while a moderate level of humour was most conducive for a favourable Ab and brand-related cognitions. Significant interaction effects suggested that the most positive advertisement effects can be obtained by combining high levels of warmth with high levels of humour, while the most positive brand effects can be obtained by combining high levels of warmth and moderate levels of humour. Emotional executions of high intensity led to the most positive affective and cognitive reactions in the case of brands that are not top of mind and to the most positive cognitive reactions in the case where the respondent was a heavy user of the product category. In particular the intensity level of humour led to significant communication effects. 相似文献