Results 261 to 270 of about 698,577 (309)
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2013
The direct addition of amine N-H bonds across an unsaturated carbon-carbon linkage gives fast and highly atom-economical access to amines. This review provides an overview of the most effective stereoselective methods using various catalyst systems based on alkali, alkaline earth, and transition metals, as well as enzymatic and organocatalytic ...
Reznichenko, Alexander L. +2 more
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The direct addition of amine N-H bonds across an unsaturated carbon-carbon linkage gives fast and highly atom-economical access to amines. This review provides an overview of the most effective stereoselective methods using various catalyst systems based on alkali, alkaline earth, and transition metals, as well as enzymatic and organocatalytic ...
Reznichenko, Alexander L. +2 more
openaire +3 more sources
SSRN Electronic Journal, 2011 We use a laboratory experiment to investigate the behavioral effects of obligations that are not backed by binding deterrent incentives. To implement such expressive law' we introduce different levels of very weakly incentivized, symmetric and asymmetric minimum contribution levels (obligations) in a repeated public goods experiment.
Riedel, Nadine +1 more
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Angewandte Chemie, 2000
While nonracemic catalysts can generate nonracemic products with or without the nonlinear relationship in enantiomeric excesses between catalysts and products, racemic catalysts inherently give only a racemic mixture of chiral products. Asymmetric catalysts, either in nonracemic or racemic form, can be further evolved into highly activated catalysts ...
K. Mikami +5 more
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While nonracemic catalysts can generate nonracemic products with or without the nonlinear relationship in enantiomeric excesses between catalysts and products, racemic catalysts inherently give only a racemic mixture of chiral products. Asymmetric catalysts, either in nonracemic or racemic form, can be further evolved into highly activated catalysts ...
K. Mikami +5 more
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2013
Rhodium is currently the metal of choice to achieve high enantioselectivities in the hydroformylation of a relatively wide variety of alkene substrates. The elucidation of the different steps of the catalytic cycle and the characterization of the resting state, together with the discovery of several types of ligands that are able to provide high ...
Bernabé F, Perandones +2 more
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Rhodium is currently the metal of choice to achieve high enantioselectivities in the hydroformylation of a relatively wide variety of alkene substrates. The elucidation of the different steps of the catalytic cycle and the characterization of the resting state, together with the discovery of several types of ligands that are able to provide high ...
Bernabé F, Perandones +2 more
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Asymmetric Research on Asymmetric Wars
International Studies Review, 2015Great Powers, Small Wars: Asymmetric Conflict Since 1945. By Deriglazova Larisa. Baltimore, MD: Johns Hopkins University Press, 2014. 408 pp., $60 hardcover (ISBN 978-1-421-41412-6). The share of international relations (IR) studies that focus on asymmetric relations does not match the share of international interactions that are asymmetric.
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Review of Economic Studies, 2000
The paper deals with asymmetric auctions. ``Asymmetries are often important in contract bidding. Each potential contractor has essentially the same information about the nature of the project but a different opportunity cost of completing it. Whenever some aspect of these differences is common knowledge, beliefs are asymmetric. In major art auctions as
Maskin, Eric, Riley, John
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The paper deals with asymmetric auctions. ``Asymmetries are often important in contract bidding. Each potential contractor has essentially the same information about the nature of the project but a different opportunity cost of completing it. Whenever some aspect of these differences is common knowledge, beliefs are asymmetric. In major art auctions as
Maskin, Eric, Riley, John
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American Journal of Physical Anthropology, 2002
AbstractThe objective of this study was to examine examples of spondylolysis in which the pattern of separation was clearly asymmetrical, in order to learn more about the process of bone separation that produces this condition. Although the primary focus was on unilateral complete separation, examples of asymmetry represented by incomplete separation ...
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AbstractThe objective of this study was to examine examples of spondylolysis in which the pattern of separation was clearly asymmetrical, in order to learn more about the process of bone separation that produces this condition. Although the primary focus was on unilateral complete separation, examples of asymmetry represented by incomplete separation ...
openaire +2 more sources
Proceedings of the 24th international conference on Machine learning, 2007
A cost-sensitive extension of boosting, denoted as asymmetric boosting, is presented. Unlike previous proposals, the new algorithm is derived from sound decision-theoretic principles, which exploit the statistical interpretation of boosting to determine a principled extension of the boosting loss.
Hamed Masnadi-Shirazi, Nuno Vasconcelos
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A cost-sensitive extension of boosting, denoted as asymmetric boosting, is presented. Unlike previous proposals, the new algorithm is derived from sound decision-theoretic principles, which exploit the statistical interpretation of boosting to determine a principled extension of the boosting loss.
Hamed Masnadi-Shirazi, Nuno Vasconcelos
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Physical Review E, 2005
The asymmetric diffusion through conical nanopores is described by the diffusional model. Diffusion is several times faster; when the concentration gradient points from the wide towards the narrow opening of the cone than in the opposite direction. The asymmetric diffusion appears either when the diffusion coefficient depends on the concentration or ...
I D, Kosińska, A, Fuliński
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The asymmetric diffusion through conical nanopores is described by the diffusional model. Diffusion is several times faster; when the concentration gradient points from the wide towards the narrow opening of the cone than in the opposite direction. The asymmetric diffusion appears either when the diffusion coefficient depends on the concentration or ...
I D, Kosińska, A, Fuliński
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Asymmetric extractions for an asymmetric malocclusion
Indian Journal of Oral Health and Research, 2016Some patients with Class II subdivision malocclusions have Class I characteristics on one side and Class II characteristics on the other. The resulting asymmetric occlusal relationship complicates orthodontic treatment. Traditionally, four premolars are extracted in such cases to achieve a bilateral Class I molar relation which needs patient compliance
Kirti Saxena +1 more
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