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排序方式: 共有745条查询结果,搜索用时 109 毫秒
741.
Dr. Anže Zupanc Joseph Install Prof. Marjan Jereb Prof. Timo Repo 《Angewandte Chemie (International ed. in English)》2023,62(5):e202214453
Noble metals exhibit broad arrange of applications in industry and several aspects of human life which are becoming more and more prevalent in modern times. Due to their limited sources and constantly and consistently expanding demand, recycling of secondary and waste materials must accompany the traditional mineral extractions. This Minireview covers the most recent solvometallurgical developments in regeneration of Pd, Pt, Rh, Ru, Ir, Os, Ag and Au with emphasis on sustainability and selectivity. Processing—by selective oxidative dissolution, reductive precipitation, solvent extraction, co-precipitation, membrane transfer and trapping to solid media—of eligible multi-metal substrates for recycling from waste printed circuit boards to end-of-life automotive catalysts are discussed. Outlook for possible future direction for noble metal recycling is proposed with emphasis on sustainable approaches. 相似文献
742.
743.
In order to facilitate model reduction by balanced truncation, we introduce state space transformations that can be used to construct an ℓ2-balanced realization of a regular, linear input-ouput map with nuclear Hankel-operator directly from the system generators of an arbitrary, given realization. These balancing transformations are based on factors of the Gramians and, for infinite-dimensional systems, they are usually unbounded operators. Subsequently the ℓ2-balanced realization can be truncated in a non-trivial way to obtain an approximating, finite-dimensional model. (© 2013 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
744.
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option. 相似文献
745.
Timo V. Laine Kristian Lappalainen Jonas Liimatta Erkki Aitola Barbro Lfgren Markku Leskel 《Macromolecular rapid communications》1999,20(9):487-491
Three pyridylimine based complexes of NiII and CoII were reacted with methylaluminoxane (MAO) and tested as catalysts in ethylene polymerization. The two nickel catalysts produced mainly methyl branched polymers with good to moderate activity, while the cobalt compound showed only marginal activity. Reaction conditions strongly affect the polymer properties, such as molecular weight, melting temperature, degree of branching, and chain end unsaturation type. 相似文献