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排序方式: 共有302条查询结果,搜索用时 46 毫秒
1.
A. Craig W. H. Jacobson A. Meyer N. Welwart A. Seuthe H. N. Marr B. S. Evans G. E. F. Lundell J. A. Scherrer E. Stelling F. J. Mück A. Kling A. Lassieur L. Bertiaux C. C. Bissett P. de Pauw J. Heslinga A. Bartsch R. E. Lee W. H. Fegeley F. H. Reichel und E. Saz 《Fresenius' Journal of Analytical Chemistry》1927,71(1-2):83-90
Ohne Zusammenfassung 相似文献
2.
L-Curve and Curvature Bounds for Tikhonov Regularization 总被引:1,自引:0,他引:1
The L-curve is a popular aid for determining a suitable value of the regularization parameter when solving linear discrete ill-posed problems by Tikhonov regularization. However, the computational effort required to determine the L-curve and its curvature can be prohibitive for large-scale problems. Recently, inexpensively computable approximations of the L-curve and its curvature, referred to as the L-ribbon and the curvature-ribbon, respectively, were proposed for the case when the regularization operator is the identity matrix. This note discusses the computation and performance of the L- and curvature-ribbons when the regularization operator is an invertible matrix. 相似文献
3.
E. Reichel 《Analytical and bioanalytical chemistry》1940,120(5-6):200-200
4.
F. Schweiger H. Mitsch E. Szirucsek P. Gerl H. -Chr. Reichel H. Urbantke R. Mück J. Cigler L. Schmetterer G. Pilz N. Hofreiter K. Kreiter K. Draxler R. Sexl 《Monatshefte für Mathematik》1969,73(2):170-192
Ohne Zusammenfassung 相似文献
5.
A special kind of partiality of heterogeneous algebraic structures is introduced. Every operator of a heterogeneous operator domain is associated with a set of term equations as necessary and sufficient domain condition.It is shown that some kind of hierarchy condition for the system of domain equations is equivalent to the condition that every injective weak homomorphism is a strong homomorphism which is equivalent to the statement that every bijective weak homomorphism is an isomorphism.On the base of this result the notions of a quasi-variety and of a variety of equationally partial heterogeneous algebras are suggested. The class of all small categories becomes a standard example of a variety of equational partial heterogeneous algebras.Presented by V. Trnková. 相似文献
6.
7.
Marco Reichel Mara Egenhöfer Burkhard Krumm Konstantin Karaghiosoff 《无机化学与普通化学杂志》2020,646(6):328-331
Fluoromethylating agents are a highly studied and controversely discussed class of compounds. New fluoromethyl pseudohalides FCH2N3, FCH2SCN, and FCH2SeCN were prepared for the first time and their physical and spectroscopic properties investigated. Their synthesis is performed conveniently by fluoromethylation of the respective silver or potassium pseudohalogenides with fluoroiodomethane. 相似文献
8.
Marco Reichel Konstantin Karaghiosoff 《Angewandte Chemie (International ed. in English)》2020,59(30):12268-12281
The introduction of a monofluoromethyl moiety has undoubtedly become a very important area of research in recent years. Owing to the beneficial properties of organofluorine compounds, such as their metabolic stability, the incorporation of the CH2F group as a bioisosteric substitute for various functional groups is an attractive strategy for the discovery of new pharmaceuticals. Furthermore, the monofluoromethyl unit is also widely used in agrochemistry, in pharmaceutical chemistry, and in fine chemicals. The problems associated with climate change and the growing need for environmentally friendly industrial processes mean that alternatives to the frequently used CFC and HFBC fluoromethylating agents (CH2FCl and CH2FBr) are urgently needed and also required by the Montreal Protocol. This has recently prompted many researchers to develop alternative fluoromethylation agents. This Minireview summarizes both the classical and new generation of fluoromethylating agents. Reagents that act via electrophilic, nucleophilic, and radical pathways are discussed, in addition to their precursors. 相似文献
9.
H. Urbantke F. Schweiger K. Seeger P. Aichelburg W. Bauer P. Flor P. Schmitt R. Sexl J. Lawrenoe A. Wehrl J. Cigler G. Ecker F. Jelinek N. Hofreiter G. Kowol H. Lausch P. Gerl Ch. Binder H. Muthsam H. C. Reichel 《Monatshefte für Mathematik》1971,75(5):453-480
Ohne Zusammenfassung 相似文献
10.