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1,960
New Twists on Auctions
, 2007
"... With the advent of the Internet, traditional auction forms have evolved to fit into a plethora business niches, either integrating into traditional approaches or simply creating new opportunities. This chapter examines two novel uses for auctions in a business context, namely sponsored search auctio ..."
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With the advent of the Internet, traditional auction forms have evolved to fit into a plethora business niches, either integrating into traditional approaches or simply creating new opportunities. This chapter examines two novel uses for auctions in a business context, namely sponsored search
A New Twist for Magnets
"... The manipulation of magnets with electrical currents is an integral part of everyday technology. It is the operating principle behind electric motors and determines how information is written onto magneticmemory devices such as computer hard drives. The underlying physical mechanism has been under ..."
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, and for very small devices, this mechanism can be much more powerful than currentinduced magnetic fields. The new mechanism, known as spin transfer, is based on the interaction of a magnet with the intrinsic spin of an electron, rather than with the electron's moving charge. On page 1015 of this issue
A New Twist on Cooperative
, 2013
"... he stereochemical configuration of an organic compound is often linked directly to its physical and biological properties. Larger molecules can contain multiple stereochemical elements, and chiral catalysts are often used to control each of these defi ned spatial arrangements in the efficient syn ..."
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he stereochemical configuration of an organic compound is often linked directly to its physical and biological properties. Larger molecules can contain multiple stereochemical elements, and chiral catalysts are often used to control each of these defi ned spatial arrangements in the efficient synthesis of a complex target ( 1). Many powerful enantioselective catalysts, which control the handedness or absolute confi guration of a product, have been developed ( 2), but full control of the relative confi guration in compounds can be a greater challenge if multiple stereocenters are generated; high diastereoselectivity, where one relative confi guration is established, may be achieved, but access to the complementary diastereomeric product usually requires major redesign of the catalyst, substrate, and/or reaction conditions, and in some cases is not possible at all (see the fi gure, panel A) ( 3). On page 1065 of this issue, Krautwald et al. ( 4) demonstrate an elegant solution to this challenge based on the cooperative action of multiple chiral catalysts in a single reaction. The idea of activating two different reacting partners independently with two distinct catalysts has been termed “dual catalysis ” or “synergistic catalysis ” ( 5). This strategy has been applied in asymmetric catalysis with some success by using a chiral catalyst and the cooperative effect of a second, achiral catalyst ( 6). In a much smaller number of cases, researchers have successfully engaged two different chiral catalysts in a synergistic man
Tracking People with Twists and Exponential Maps
, 1998
"... This paper demonstrates a new visual motion estimation technique that is able to recover high degreeoffreedom articulated human body configurations in complex video sequences. We introduce the use of a novel mathematical technique, the product of exponential maps and twist motions, and its integra ..."
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Cited by 450 (5 self)
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This paper demonstrates a new visual motion estimation technique that is able to recover high degreeoffreedom articulated human body configurations in complex video sequences. We introduce the use of a novel mathematical technique, the product of exponential maps and twist motions, and its
A new twist on Lorenz links
, 2009
"... Twisted torus links are given by twisting a subset of strands on a closed braid representative of a torus link. T–links are a natural generalization, given by repeated positive twisting. We establish a onetoone correspondence between positive braid representatives of Lorenz links and T–links, so L ..."
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Cited by 14 (4 self)
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Twisted torus links are given by twisting a subset of strands on a closed braid representative of a torus link. T–links are a natural generalization, given by repeated positive twisting. We establish a onetoone correspondence between positive braid representatives of Lorenz links and T–links, so
NEW TWISTED QUANTUM CURRENT ALGEBRAS
, 1999
"... Abstract. We introduce a twisted quantum affine algebra associated to each simply laced finite dimensional simple Lie algebra. This new algebra is a Hopf algebra with a Drinfeldtype comultiplication. We obtain this algebra by considering its vertex representation. The vertex representation quantize ..."
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Cited by 3 (3 self)
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Abstract. We introduce a twisted quantum affine algebra associated to each simply laced finite dimensional simple Lie algebra. This new algebra is a Hopf algebra with a Drinfeldtype comultiplication. We obtain this algebra by considering its vertex representation. The vertex representation
New twist field couplings from the
, 709
"... partition function for multiply wrapped Dbranes. ..."
Unitary Equivalence: A New Twist On Signal Processing
, 1995
"... Unitary similarity transformations furnish a powerful vehicle for generating infinite generic classes of signal analysis and processing tools based on concepts different from time, frequency, and scale. Implementation of these new tools involves simply preprocessing the signal by a unitary transfo ..."
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Cited by 72 (15 self)
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Unitary similarity transformations furnish a powerful vehicle for generating infinite generic classes of signal analysis and processing tools based on concepts different from time, frequency, and scale. Implementation of these new tools involves simply preprocessing the signal by a unitary
A New TwIST: TwoStep Iterative Shrinkage/Thresholding Algorithms for Image Restoration
 IEEE TRANSACTIONS ON IMAGE PROCESSING
, 2007
"... Iterative shrinkage/thresholding (IST) algorithms have been recently proposed to handle a class of convex unconstrained optimization problems arising in image restoration and other linear inverse problems. This class of problems results from combining a linear observation model with a nonquadratic ..."
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Cited by 183 (26 self)
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. For noninvertible observation operators, we introduce a monotonic version of TwIST (MTwIST); although the convergence proof does not apply to this scenario, we give experimental evidence that MTwIST exhibits similar speed gains over IST. The effectiveness of the new methods are experimentally confirmed on problems
Torsional restraint: a new twist on frameshifting pseudoknots
 Nucleic Acids Res
, 2005
"... mRNA pseudoknots have a stimulatory function in programmed 1 ribosomal frameshifting ( 1 PRF). Though we previously presented a model for how mRNA pseudoknots might activate the mechanism for 1 PRF, it did not address the question of the role that they may play in positioning the mRNA relative to th ..."
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Cited by 21 (3 self)
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mRNA pseudoknots have a stimulatory function in programmed 1 ribosomal frameshifting ( 1 PRF). Though we previously presented a model for how mRNA pseudoknots might activate the mechanism for 1 PRF, it did not address the question of the role that they may play in positioning the mRNA relative to the ribosome in this process [E. P. Plant,
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