999 resultados para 1477


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报道了顺-二氯二联吡啶钌(Ⅱ)和顺-二氯二邻二氮菲钉(Ⅱ)的核磁共振氢谱。利用1H-1H COSY谱详细分析并归属了这两种络合物的氢谱峰,并给出了各质子的偶合数,同时验证了其顺式的立体构型。

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Gas phase ion-molecular reactions of endohedral metallofullerenes with the self-chemical ionization ion system of vinyl acetate, benzene and acetone in the ion source of the mass spectrometer have been studied. Several derivatized endohedral metallofullerene cations [M@C-82-C2H3O](+), [M-2@C-80-C2H3O](+), [M@C-82-C6H6](+) and [M@C-82-CO-CH3](+) are observed as the major products. The experimental results indicate that endohedral metallofullerenes have active gas phase reactivities and can be efficiently derivatized by some small organic cations.

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本发明涉及扁蕾植物的引种栽培技术,该技术包括种子处理和引种栽培工艺。本发明通过对扁蕾植物种子进行物理和化学处理,使扁蕾种子萌发率达70%以上;通过地膜覆盖技术,即在种子播种前采用地膜覆盖7-28天,可有效地控制杂草数量和生长,为规模化种植奠定可靠的基础;通过在海拔 1500-4500米的原产水浇大田或适宜旱耕地的引种栽培途径,可快速恢复扁蕾的资源量,并有效地保证扁蕾的药材品质和药效成分。

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本文在[1]扩展关系模型中引入属性级的不完全信息空值。为适应此环境下更新操作的需要,本文对[1]中的扩展关系模型进行了进一步的扩展,并以此模型为基础讨论了空值环境下含不确定及可能信息关系数据库的更新操作的策略,给出了相应的处理算法。

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在过去很长一段时间里重金属含量的高低一直都被看作是土壤污染程度的一个重要指标.当化学相的概念被引入到环境科学领域后,人们才逐渐地认识到重金属在环境中的行为和作用,如活动性、生物可利用性、毒性等,用这些金属在环境中的总量来预测和解释是不确切的。为此,许多化学和生物的方法被用来描述土壤与沉积物中重金属的活性。文章对近年来在该领域内的主要研究工作进行了总结,并对其未来可能的发展方向提出了自己的见解。

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Purpose – The purpose of this paper is to outline unique learning experience that virtual/e-internships can offer small and medium-sized enterprises and start-up organizations. Design/methodology/approach – We interviewed 18 experts on e-internships (interns and managers of internships) across several countries to learn more about the learning experiences for both organizations and interns. The information from these interviews was also used to formulate a number of recommendations. Findings – The interviews provided insights into how e-internships can provide development opportunities for interns, managers and staff within these organizations. One important benefit pertains to the skill development of both interns and managers. The interns get unique working experiences that also benefit the organizations in terms of their creativity, input and feedback. In return, managers get a unique learning experience that helps them expand their project management skills, interpersonal skills and mentoring. Practical implications – We outline a number of recommendations that consider skill development, the benefit of diversity in numerous forms as well as mutual benefits for enterprises and start-ups. Originality/value – The discussion of the various benefits and conditions under which virtual internships will succeed in organizations provide practitioners an insight into the organizational opportunities available to them given the right investment into e-interns and internship schemes.

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Ashmore, P. Brayshay, B.A Edwards, K.J Gilbertson, D. Grattan, J. Kent, M. Pratt, K. Weaver, R. 'Allochthonous and autochthonous mire deposits, slope instability and palaeoenvironmental investigations in the Borve Valley, Barra, Outer Hebrides, Scotland' The Holocene 2000 10, 1 pp.97-108

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Hunt, C. Elrishi, H. Gilbertson, D. Grattan, J. McLaren, S. Pyatt, B. Rushworth, G. Barker, G. Early-Holocene environments in the Wadi Faynan, Jordan. The Holocene. 2004. 14,6 pp 921-930

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Jackson, Richard, (2007) 'Constructing Enemies: 'Islamic Terrorism' in Political and Academic Discourse', Government and Opposition, 42(3) pp.394-426 RAE2008

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Mottram, S. (2005). Reading the rhetoric of nationhood in two Reformation pamphlets by Richard Morison and Nicholas Bodrugan. Renaissance Studies. 19(4), pp.523-540. RAE2008

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Douglas, Robert; Cullen, M.J.P., (2002) 'Large-Amplitude nonlinear stability results for atmospheric circulations', The Quarterly Journal of the Royal Meteorological Society 129 pp.1969-1988 RAE2008

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EI Mikhailova, SP Sosnikhina, GA Kirillova, OA Tikholiz, VG Smirnov, RN Jones and G Jenkins (2001). Nuclear dispositions of subtelomeric and pericentromeric chromosomal domains during meiosis in asynaptic mutants of rye (Secale cereale L.). Journal of Cell Science, 114 (10), 1875-1882. Sponsorship: Russian Foundation for Basic Research (grants 00-04-48522/ 99-04-48182) RAE2008

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http://ijl.oxfordjournals.org/cgi/reprint/ecp022?ijkey=FWAwWPvILuZDT1S&keytype=ref