951 research outputs found
Jing Wang. High culture fever : politics, aesthetics, and ideology in Deng\u27s China; Jing Wang, ed. China\u27s avant-garde fiction : an anthology
This article reviews the books High Culture Fever: Politics, Aesthetics, and Ideology in Deng\u27s China written by Jing Wang and China\u27s Avant-Garde Fiction: An Anthology edited by Jing Wang
Quantum Metrology with Indefinite Causal Order
We address the study of quantum metrology enhanced by indefinite causal
order, demonstrating a quadratic advantage in the estimation of the product of
two average displacements in a continuous variable system. We prove that no
setup where the displacements are probed in a fixed order can have
root-mean-square error vanishing faster than the Heisenberg limit 1/N, where N
is the number of displacements contributing to the average. In stark contrast,
we show that a setup that probes the displacements in a superposition of two
alternative orders yields a root-mean-square error vanishing with
super-Heisenberg scaling 1/N^2. This result opens up the study of new
measurement setups where quantum processes are probed in an indefinite order,
and suggests enhanced tests of the canonical commutation relations, with
potential applications to quantum gravity.Comment: 11 pages, 3 figure
Three-Leaf Dart-Shaped Single-Crystal BN Formation Promoted by Surface Oxygen
Two-dimensional hexagonal boron nitride (h-BN) single crystals with various
shapes have been synthesized by chemical vapor deposition over the past several
years. Here we report the formation of three-leaf dart (3LD)-shaped single
crystals of h-BN on Cu foil by atmospheric-pressure chemical vapor deposition.
The leaves of the 3LD-shaped h-BN are as long as 18 {\mu}m and their edges are
smooth armchair on one side and stepped armchair on the other. Careful analysis
revealed that surface oxygen plays an important role in the formation of the
3LD shape. Oxygen suppressed h-BN nucleation by passivating Cu surface active
sites and lowered the edge attachment energy, which caused the growth kinetics
to change to a diffusion-controlled mode.Comment: 7 pages,6 figure
Scalarizing Functions in Decomposition-Based Multiobjective Evolutionary Algorithms
Decomposition-based multiobjective evolutionary algorithms (MOEAs) have received increasing research interests due to their high performance for solving multiobjective optimization problems. However, scalarizing functions (SFs), which play a crucial role in balancing diversity and convergence in these kinds of algorithms, have not been fully investigated. This paper is mainly devoted to presenting two new SFs and analyzing their effect in decomposition-based MOEAs. Additionally, we come up with an efficient framework for decomposition-based MOEAs based on the proposed SFs and some new strategies. Extensive experimental studies have demonstrated the effectiveness of the proposed SFs and algorithm
The Important Functions of GSH-Dependent Enzyme Glutaredoxin 2 (Grx2)
Reactive oxygen species (ROS) are generated at a very high rate throughout our lives as part of normal aerobic life. Glutathione (GSH), normally an antioxidant molecule that scavenges free radicals, oxidizes to form glutathione mixed disulfide (GSSG). As the GSSG/GSH ratio increases, GSSG naturally adds to other proteins, causing protein glutathionylation. Protein glutathionylation, defined as the reversible formation of a mixed disulfide (PSSG) between protein thiols (P-SH) and glutathione (GSH), appears to be the most important mode of thiol oxidation. In my chapter, we will discuss the important roles of GSH and GSH-dependent enzymes in health and disease, with the emphasis on glutaredoxin and thioredoxin systems. Their structures, catalytic reaction mechanisms, major physiological functions, and associations with diseases will be summarized in my chapter. We will also mention how GSH-dependent enzymes play a role in each major organ systems including the nervous, cardiovascular, immune, and visual system
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