20,967 research outputs found
On a Linear Chaotic Quantum Harmonic Oscillator
We show that a linear quantum harmonic oscillator is chaotic in the sense of
Li-Yorke. We also prove that the weighted backward shift map, used as an
infinite dimensional linear chaos model, in a separable Hilbert space is
chaotic in the sense of Li-Yorke, in addition to being chaotic in the sense of
Devaney.Comment: LaTex file. Applied Mathematics Letters, to appea
OOGAN: Disentangling GAN with One-Hot Sampling and Orthogonal Regularization
Exploring the potential of GANs for unsupervised disentanglement learning,
this paper proposes a novel GAN-based disentanglement framework with One-Hot
Sampling and Orthogonal Regularization (OOGAN). While previous works mostly
attempt to tackle disentanglement learning through VAE and seek to implicitly
minimize the Total Correlation (TC) objective with various sorts of
approximation methods, we show that GANs have a natural advantage in
disentangling with an alternating latent variable (noise) sampling method that
is straightforward and robust. Furthermore, we provide a brand-new perspective
on designing the structure of the generator and discriminator, demonstrating
that a minor structural change and an orthogonal regularization on model
weights entails an improved disentanglement. Instead of experimenting on simple
toy datasets, we conduct experiments on higher-resolution images and show that
OOGAN greatly pushes the boundary of unsupervised disentanglement.Comment: AAAI 202
Detach and Adapt: Learning Cross-Domain Disentangled Deep Representation
While representation learning aims to derive interpretable features for
describing visual data, representation disentanglement further results in such
features so that particular image attributes can be identified and manipulated.
However, one cannot easily address this task without observing ground truth
annotation for the training data. To address this problem, we propose a novel
deep learning model of Cross-Domain Representation Disentangler (CDRD). By
observing fully annotated source-domain data and unlabeled target-domain data
of interest, our model bridges the information across data domains and
transfers the attribute information accordingly. Thus, cross-domain joint
feature disentanglement and adaptation can be jointly performed. In the
experiments, we provide qualitative results to verify our disentanglement
capability. Moreover, we further confirm that our model can be applied for
solving classification tasks of unsupervised domain adaptation, and performs
favorably against state-of-the-art image disentanglement and translation
methods.Comment: CVPR 2018 Spotligh
Exploration of the phase diagram of 5D anisotropic SU(2) gauge theory
In this paper we attempt a non-perturbative study of the five dimensional,
anisotropic SU(2) gauge theory on the lattice using Monte-Carlo techniques. Our
goal is the exploration of the phase diagram, define the various phases and the
critical boundary lines. Three phases appear, two of them are continuations of
the Strong and the Weak coupling phases of pure 4d SU(2) to non-zero coupling
in the fifth transverse direction and they are separated by a
crossover transition, while the third phase is a 5D Coulombic phase. We provide
evidence that the phase transition between the 5D Coulomb phase and the Weak
coupling phase is a second order phase transition. Assuming that this result is
not altered when increasing the lattice volume we give a first estimate of the
associated critical exponents. This opens the possibility for a continuum
effective five dimensional field theory.Comment: 16 pages, 10 figures, essential improvement in the study of the phase
diagra
Scaling Exponent and Fluctuation Strength in High Energy Collisions
The information on dynamical fluctuations that can be extracted from the
anomalous scaling observed recently in hadron-hadron collision experiments is
discussed in some detail. A parameter ``effective fluctuation strength'' is
proposed to estimate the strength of dynamical fluctuations. The method for
extracting its value from the experimentally observed quantities is given. Some
examples for the application of this method to real experimental data are
presented.Comment: 9 pages 4 PS figures. Phys. Lett. B in pres
Unveiling multiple AGN activity in galaxy mergers
In this paper we present an overview of the MAGNA (Multiple AGN Activity)
project aiming at a comprehensive study of multiple supemassive black hole
systems. With the main goal to characterize the sources in merging systems at
different stages of evolution, we selected a sample of objects optically
classified as multiple systems on the basis of emission line diagnostics and
started a massive multiband observational campaign. Here we report on the
discovery of the exceptionally high AGN density compact group SDSS~J0959+1259.
A multiband study suggests that strong interactions are taking place among its
galaxies through tidal forces, therefore this system represents a case study
for physical mechanisms that trigger nuclear activity and star formation. We
also present a preliminary analysis of the multiple AGN system
SDSS~J1038+3921.}Comment: Proceedings paper for "XMM-Newton: The Next Decade" (held in 2016
May); accepted to be published in Astronomische Nachrichten / Astronomical
Notes (AN
Characterization of the Antheraea pernyi abnormal wing disc gene that may contribute to its temperature tolerance
It has been known that the abnormal wing disc (awd) gene encodes a nucleoside diphosphate kinase and is closely related to wing development in Drosophila melanogaster and Bombyx mori. In the present study, the awd gene was isolated and characterized from Antheraea pernyi, a well-known wild silkmoth. The isolated cDNA sequence is 666 bp in length with an open reading frame of 462 bp encoding a polypeptide of 153 amino acids, which contains a putative nucleoside diphosphate kinases active site motif and conserved multimer interface. The deduced A. pernyi awd protein sequence reveals 75, 82 and 96% identity with its homologue of Homo sapiens, D. melanogaster, and B. mori, respectively. Semi-quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) analysis showed that the awd gene was transcribed during all four developmental stages (egg, larva, pupa, and moth), and present in all tissues tested (blood, midgut, silk glands, Malpighian tublues, spermaries, ovaries, brain, muscle, fat body and body wall), with the highest abundance in Malpighian tubules. Interestingly, mRNA expression level in pupal fat body was significantly down-regulated after cold shock (4°C) compared with the control (26°C) and significantly up-regulated after heat shock (46°C). The results indicated that the A. pernyi awd gene is inducible, and that its expression effect is different after cold stress and heat stress. Consequently, we refer that the product of the awd gene may contribute to its temperature tolerance.Key words: Antheraea pernyi, abnormal wing disc gene, cloning, expression pattern, temperature stress
A Neutral Two Flavor Loff Color Superconductor
In this paper we construct analytically a LOFF color superconducting state
that is both color and charge neutral using the weak coupling approximation. We
demonstrate that this state is free from chromomagnetic instabilities. Its
relevance to the realistic quark matter at moderately high baryon density is
discussed.Comment: 9 pages, Latex, correction of algebraic mistake and typo
Victim sensitivity and altruistic behavior in school: mediating effects of teacher justice and teacher-student relationship
The current study aimed to explore how victim sensitivity influenced altruistic behaviors in school and to explore the mediating roles of teacher justice and teacher-student relationship. In 2018, we recruited 1,856 Chinese adolescents including 989 fourth graders (M = 10.35, SD = 0.56) and 867 eighth graders (M = 15.57, SD = 0.91), and the participation rate was 100%. Participations completed the self-report victim sensitivity scale, the teacher justice scale, the teacher-student relationship scale, and the altruistic behavior toward classmate scale. Structural equation modeling (SEM) indicated that victim sensitivity had a direct negative effect on altruistic behavior in school, but this relationship was mediated by teacher justice. There was also a mediated path between teacher justice and altruistic behavior by way of teacher-student relationship. These findings suggested possible mechanisms to explain the relationship between victim sensitivity and altruistic behavior and provided new directions for intervention
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