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农用稀土微肥在我国已大面积推广使用,但农用稀土在土壤微生物、土壤动物—蚯蚓和高等植物中富集并对其产生负面效应,因此其环境风险已成为当前稀土农用研究中亟待解决的关键问题之一。探讨了农业应用稀土对土壤生态环境可能产生的影响,为农用稀土的环境生态评价提供客观可靠的参考信息。 相似文献
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稀土元素在农业上的应用(简称稀土农用)是一项涉及多个专业部门、多种研究领域的新兴学科,稀土农用经过我国科技工作者的多年努力,取得了具有中国特色的国际领先水平的科研成果。本文简要介绍了我国稀土农用研究的历史、现状、最新科研成果以及大面积示范推广应用所取得的显著经济效益。。 相似文献
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本文通过试验资料分析 ,认为把稀土掺到复合肥中或用其它方式直接施入土壤不是稀土农用技术开发研究的方向。这不但造成稀土资源的浪费而且带来重金属污染环境的危险。传统的集中施用稀土的方法是合理的 相似文献
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稀土元素的环境行为及其生态效应研究。围绕我国特有的稀土农用潜在环境生态安全问题,王晓蓉教授持续15年开展稀土污染化学的系统研究。首次获得了稀土沿水生食物链迁移规律,发现土壤酸度和土壤腐殖酸对稀土传输及生物有效性的重要调控作用及机制,揭示了稀土在水、土壤中的形态分布与转化规律,提供了一套研究稀土环境过程的理化常数和参数,系统阐明了外源稀土在水、土壤环境中分布特征及生物地球化学过程, 相似文献
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章骏斌 《闽西职业技术学院学报》2006,8(2):125-127
我国自20世纪80年代中期开展了稀土农用的研究,但在林业上的实际推广应用还十分有限。多年的研究表明,稀土林用是一项低成本、高效益的林业增产技术。概述了稀土微肥的发展概况及其在林业生产中的应用和效果,并对其增产机理、毒理作用、施用技术和注意事项作了分析介绍;最后结合福建省的实际,对稀土微肥开发应用的前景进行探讨。 相似文献
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通径分析的着眼点就是在相关系数的分解上,以揭示自变量对因变量的直接影响和间接影响,通过通径分析赣南脐橙品质与稀土元素的相关性,从而揭示稀土元素与有机营养物质的相关程度,为稀土农用提供相关的科学依据,以此为果农科学使用稀土微肥提供一些理论上的指导。 相似文献
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通径分析的着眼点就是在相关系数的分解上,以揭示自变量对因变量的直接影响和间接影响,通过通径分析赣南脐橙品质与稀土元素的相关性,从而揭示稀土元素与有机营养物质的相关程度,为稀土农用提供相关的科学依据,以此为果农科学使用稀土微肥提供一些理论上的指导。 相似文献
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在测定橡胶树乳管细胞黄色体产生超氧阴离子（O2^-)速率的过程中，当加入0．188mmol/L的La(NO3)3时黄色体产生O2^-的速率被明显抑制；当La(NO3)3的浓度达到18．8mmol/L时黄色体产生O2^-的反应几乎被完全抑制；当加入0．3％的农用稀土时黄色体产生O2^-的速率被抑制了53．9％；而加入1％的农用稀土时黄色体产生O2^-的反应已被完全抑制。 相似文献
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Anders Sjöborg 《British Journal of Religious Education》2013,35(1):36-54
Recent studies show that religious education (RE) may play an important role for teaching intercultural understanding in many Western societies facing increased cultural and religious pluralism. Quantitative and qualitative research have however failed to examine what role the religiosity of the students plays in their attitudes towards RE. A nationally representative Swedish sample of 1850 students answered a classroom questionnaire. The main result was that, when controlling for background variables such as gender, foreign background, parents’ education level and study programme, the students’ religiosity had a significant effect on their attitudes towards (a) existential issues, (b) preferences on what to study in RE as well as (c) incentives for studying RE. Regression analyses demonstrated that by entering individuals’ religiosity into the model the effect of foreign background was suspended in 11 out of 14 cases. In order to understand the attitude towards RE, it is useful to include the students’ religiosity. As a consequence, this article argues that in order to reach the citizenship goals of educating for intercultural understanding in RE, the subject should be developed to reach male students, students with parents with lower levels of education, students in vocational study programmes and students who are not religious. 相似文献
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Norman Richardson Ulrike Niens Alison Mawhinney Yuko Chiba 《British Journal of Religious Education》2013,35(3):236-250
A recent research study has examined the role and effectiveness of conscience clauses as a means of protecting the freedom of religion and belief of members of minority faith communities in relation to the teaching of religious education (RE) in schools. While the specific context for this study related to young people from such communities in Northern Ireland, its implications have wider application to other national contexts. In this article, the principal focus is on the significance of the study for the content of, and approach to, RE in schools. 相似文献
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为探究稀土水杨酸8-羟基喹啉三元配合物RE(sal)2hq(RE=Pr、Gd)对大肠杆菌的抑菌效果.实验采用杯碟法和二倍稀释法,通过测量抑菌圈直径探讨了两种配合物及其配体的抑菌能力.结果表明:配体8-羟基喹啉、配合物RE(sal)2hq(RE=Pr、Gd)都具有很好的抑菌效果,而配体水杨酸及稀土(RE=Pr、Gd)离子抑菌效果都不明显.配合物Pr(sal)2hq、Gd(sal)2hq和配体8-羟基喹啉的最小抑菌浓度MIC值分别为:0.5 mmo/lL、1 mmo/lL和1 mmo/lL.最小杀菌浓度MBC值分别为:4mmo/lL、5mmo/lL和14mmo/lL.初步推测稀土水杨酸8-羟基喹啉三元配合物可以作为药物运用于有害大肠杆菌的防治中. 相似文献
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简要叙述稀土材料在传统及高新技术领域的应用状况，提出应进一步发掘其内在潜力，开发更多用途的稀土产品。 相似文献
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The electrodeposition and electrochemical behaviors of rare earths in different ionic liquids are summarized. It is demonstrated that most of the rare earths can be electrodeposited in ionic liquids except cerium. Anion of ionic liquids appears to play a significant role in determining the electrochemical windows, and then deciding whether the corresponding ionic liquids can be used for rare earths electrodeposition. The electrochemical behaviors of the reduction process in ionic liquids are similar to those in high-temperature molten salts. The reduction of RE（III） to RE（II） has different reversibility, but the reaction of rare earths to their zerovalent state is irreversible. 相似文献
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为了研究稀土元素对中碳钢冲击韧性的影响,利用真空感应炉熔炼稀土合金化的S50C钢进行冲击韧性测试。应用JB-30B冲击试验机测定钢试样的冲击功,并通过SEM和EDS检测手段分析稀土元素对S50C钢微观结构的影响。结果表明,与未含稀土元素的钢试样相比,含有微量稀土元素（0.003 5%）的钢试样冲击功增加了0.45倍;晶粒明显细化,珠光体数量减少,软相的铁素体组织增多,且连成柔性的网状,同时钢中夹杂物由多面形改变为尺寸更小的球面形。 相似文献
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在纯铜熔体中以 Al-RE 中间合金形式加入富 Ce 混合稀土,探讨了 RE 加入量对电工用铜母线铸态组织、力学性能和导电性的影响规律.结果表明:纯铜基体的纯净度随RE加入量的增加而明显提高,当w(RE)=0.02%时,结晶组织最为细小,力学性能得到改善;添加RE可显著改善纯铜的导电性,其影响作用取决于稀土化合物的分布状态及基体的纯净度,当w(RE)》0.02%后,导电率略为降低.当w(RE)=0.05%,可使纯铜获得较理想的综合性能,基本满足高强高韧高导铜母线的生产要求. 相似文献
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Mark Chater 《British Journal of Religious Education》2014,36(3):256-264
The Religious Education Council’s (REC) 2013 Review of Religious Education in England consists of a National Curriculum Framework for RE (NCFRE) designed to unite the RE community around a shared programme of study for pupils aged 4–14, and a set of six policy recommendations for the consideration of the RE community and government in England. The new NCFRE includes a statement of the purpose of study, shared educational aims and agreed range of content in terms of religions and world views, in parallel with national curriculum documents for other subjects. The policy recommendations, which spring from the same evidence base as the programme of study, address some pressing issues for RE in England, including assessment and qualifications, professional support and development of RE teachers, the structures of the RE professional community and the legal settlement around RE in England. 相似文献