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土壤放射性污染的来源、积累和迁移 被引量:31
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作者 董武娟 吴仁海 《云南地理环境研究》 2003年第2期83-87,共5页
土壤放射性污染的人为来源包括核试验、核武器制造、核能生产和核事故、放射性同位素的生产和应用、矿物的开采、冶炼和应用。分析影响土壤放射性污染物质在动植物中积累和迁移的因素 ,包括气候与地形、放射性核素的形态和性质、土壤性... 土壤放射性污染的人为来源包括核试验、核武器制造、核能生产和核事故、放射性同位素的生产和应用、矿物的开采、冶炼和应用。分析影响土壤放射性污染物质在动植物中积累和迁移的因素 ,包括气候与地形、放射性核素的形态和性质、土壤性质、植物种类、肥料、化学添加剂和人类的耕种。对国内外土壤放射性污染的研究动态进行初步综述 ,国内外对1 3 7Cs和90 Sr研究比较透彻 ,但缺乏土壤微生物、阳离子交换量、温度等对土壤放射性污染物质在动植物中的积累和迁移影响方面的研究。 展开更多
关键词 放射性污染 人工来源 土壤 放射性核素
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Sustainable Development and the Basic Value of Natural Environment 被引量:1
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作者 Jia Zhong Li Jianhua 《Chinese Journal of Population,Resources and Environment》 2009年第1期89-93,共5页
Contrast with artificial environment, the multi-level self-organizational system of nature has great gain. Sustain-able material environment should respect nature: non-rubbish and super-cycle quality of natural ecosys... Contrast with artificial environment, the multi-level self-organizational system of nature has great gain. Sustain-able material environment should respect nature: non-rubbish and super-cycle quality of natural ecosystem offers the material source of human development, fractal structure of nature offers new field of space and information source to this high-density and information-based society, dissipative structure of nature links the new system of energy with whole ecosystem organi-cally, and life-chain regulation is the base of sustainable life environment. Nature guarantees the physical healthy environ-ment by its all-dimension healthy factor, constructs the mental healthy environment by its quality of co-ordinate and chaos, so that guarantees the whole emergence of sustainable develop-ment on the 'super-science' level. In the view of sustainable development, construction, green economy and human health are basic fields. With the concept of ecosystem regulation, we can relate these fields organically and fulfill the task of human health, welfare and sustainable development. Ecosystem regulation is the base of sustainable development's new para-digm. 展开更多
关键词 sustainable development natural environment ECOSYSTEM HEALTH SELF-ORGANIZATION
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Factor Affecting Technical Change of Credit Union Co-operative in Upper Northern of Thailand
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作者 Aussawin Phaoumnuaywit Thanes Sriwichailamphan Nisit Panthamit 《Journalism and Mass Communication》 2016年第6期350-358,共9页
Credit union co-operatives are organized for supporting poor people who are difficult to find funding sources for improvement their economic security. Majority of the credit unions co-operatives are made up of members... Credit union co-operatives are organized for supporting poor people who are difficult to find funding sources for improvement their economic security. Majority of the credit unions co-operatives are made up of members who are currently working in the agricultural sectors. However some of credit union co-operatives have members who are working in non-agriculture sectors, they use credit union co-operatives to improve quality as farmer. The main objective in this paper is comparison of technical operation efficiency of the credit unions agriculture and non-agriculture sector with sample size of 170 groups from eight provinces in the upper northern region of Thailand, using the Malmquist Productivity Index Approach. 展开更多
关键词 efficiency MALMQUIST credit union agriculture sector non-agriculture sector
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揭开反式脂肪酸的真面目
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作者 刘丹丹 《中国生殖健康》 2018年第5期59-59,共1页
在您饱尝美味的加工食品时,冠心病、糖尿病等疾病也会悄悄地临近,这是为什么呢?原来,一种叫作反式脂肪酸的物质,正在成为健康的杀手。下面我们就来认识一下反式脂肪酸这个食品中的'定时炸弹'吧。反式脂肪酸的来源1.天然食物,如... 在您饱尝美味的加工食品时,冠心病、糖尿病等疾病也会悄悄地临近,这是为什么呢?原来,一种叫作反式脂肪酸的物质,正在成为健康的杀手。下面我们就来认识一下反式脂肪酸这个食品中的'定时炸弹'吧。反式脂肪酸的来源1.天然食物,如牛、羊肉和奶类、乳制品,这种天然的反式脂肪酸在食物中含量极少,不但对人体没有害处。 展开更多
关键词 反式脂肪酸 植物油 天然食物 人工来源
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