22,828 research outputs found
Time-reversal of rank-one quantum strategy functions
The quantum strategy (or quantum combs) framework is a useful tool for
reasoning about interactions among entities that process and exchange quantum
information over the course of multiple turns. We prove a time-reversal
property for a class of linear functions, defined on quantum strategy
representations within this framework, that corresponds to the set of rank-one
positive semidefinite operators on a certain space. This time-reversal property
states that the maximum value obtained by such a function over all valid
quantum strategies is also obtained when the direction of time for the function
is reversed, despite the fact that the strategies themselves are generally not
time reversible. An application of this fact is an alternative proof of a known
relationship between the conditional min- and max-entropy of bipartite quantum
states, along with generalizations of this relationship.Comment: 17 page
The Hawking-Page phase transitions in the extended phase space in the Gauss-Bonnet gravity
In this paper, the Hawking-Page phase transitions between the black holes and
thermal anti-de Sitter (AdS) space are studied with the Gauss-Bonnet term in
the extended phase space, in which the varying cosmological constant plays the
role of an effective thermodynamic pressure. The Gauss-Bonnet term exhibits its
effects via introducing the corrections to the black hole entropy and Gibbs
free energy. The global phase structures, especially the phase transition
temperature and the Gibbs free energy , are systematically
investigated, first for the Schwarzschild-AdS black holes and then for the
charged and rotating AdS black holes in the grand canonical ensembles, with
both analytical and numerical methods. It is found that there are terminal
points in the coexistence lines, and decreases at large electric
potentials and angular velocities and also decreases with the Gauss-Bonnet
coupling constant .Comment: 13 pages, 13 figure
Feel Safe to Take More Risks? Insecure Attachment Increases Consumer Risk-Taking Behavior
open access articl
Threshold-free Evaluation of Medical Tests for Classification and Prediction: Average Precision versus Area Under the ROC Curve
When evaluating medical tests or biomarkers for disease classification, the
area under the receiver-operating characteristic (ROC) curve is a widely used
performance metric that does not require us to commit to a specific decision
threshold. For the same type of evaluations, a different metric known as the
average precision (AP) is used much more widely in the information retrieval
literature. We study both metrics in some depths in order to elucidate their
difference and relationship. More specifically, we explain mathematically why
the AP may be more appropriate if the earlier part of the ROC curve is of
interest. We also address practical matters, deriving an expression for the
asymptotic variance of the AP, as well as providing real-world examples
concerning the evaluation of protein biomarkers for prostate cancer and the
assessment of digital versus film mammography for breast cancer screening.Comment: The first two authors contributed equally to this paper, and should
be regarded as co-first author
Preparation and properties of novel dental adhesives based upon pentaerythritol
Urethane methacrylates were synthesized from Pentaerythritol, TDI, HEMA and four phenolic blocking agents or from hydroxypropyl methacrylatel TDI and two phenolic blocking agents. All the products were characterized by melting pointy infrared spectroscopy, NMR spectra, and elemental analysis. The bonding of these materials to dentin slices was also investigated. Such materials are supposed to not only react with the organic constituent of dentin but also polymerized with restorative resin. It was found that bond strength was enhanced by the use of the urethane methacrylates, resulting in best mean bonding strengths of 2400 psi
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