4,393 research outputs found
Thermodynamics in the universe described by the emergence of the space and the energy balance relation
It has previously been shown that it is more general to describe the
evolution of the universe based on the emergence of the space and the energy
balance relation. Here we investigate the thermodynamic properties of the
universe described by such a model. We show that the first law of
thermodynamics and the generalized second law of thermodynamics (GSLT) are both
satisfied and the weak energy condition are also fulfilled for two typical
examples. Finally we examine the physical consistency for the present model.Comment: 9 pages, 2 figure
Real-time Streaming Video Denoising with Bidirectional Buffers
Video streams are delivered continuously to save the cost of storage and
device memory. Real-time denoising algorithms are typically adopted on the user
device to remove the noise involved during the shooting and transmission of
video streams. However, sliding-window-based methods feed multiple input frames
for a single output and lack computation efficiency. Recent multi-output
inference works propagate the bidirectional temporal feature with a parallel or
recurrent framework, which either suffers from performance drops on the
temporal edges of clips or can not achieve online inference. In this paper, we
propose a Bidirectional Streaming Video Denoising (BSVD) framework, to achieve
high-fidelity real-time denoising for streaming videos with both past and
future temporal receptive fields. The bidirectional temporal fusion for online
inference is considered not applicable in the MoViNet. However, we introduce a
novel Bidirectional Buffer Block as the core module of our BSVD, which makes it
possible during our pipeline-style inference. In addition, our method is
concise and flexible to be utilized in both non-blind and blind video
denoising. We compare our model with various state-of-the-art video denoising
models qualitatively and quantitatively on synthetic and real noise. Our method
outperforms previous methods in terms of restoration fidelity and runtime. Our
source code is publicly available at https://github.com/ChenyangQiQi/BSVDComment: Accepted to ACM MM 2022; Github link:
https://github.com/ChenyangQiQi/BSVD
Poly[[bisÂ[μ2-8-ethyl-5-oxo-2-(piperazin-1-yl)-5,8-dihydroÂpyrido[2,3-d]pyrimidine-6-carboxylÂato]cobalt(II)] dihydrate]
The title compound, {[Co(C14H16N5O3)2]·2H2O}n or [Co(ppa)2]·2H2O}n, where ppa denotes the 8-ethyl-5-oxo-2-(piperazin-1-yl)-5,8-dihydroÂpyrido[2,3-d]pyrimidine-6-carbÂoxÂylÂate anion, was synthesized under hydroÂthermal conditions. The CoII atom (site symmetry ) exhibits a distorted trans-CoN2O4 octaÂhedral geometry defined by two monodentate N-bonded and two bidentate O,O′-bonded ppa anions. The extended two-dimensional structure is a square grid, which is consolidated by N—H⋯O hydrogen bonds. The disordered uncoordinated water molÂecules occupy cavities within the grid
Chaos-assisted two-octave-spanning microcombs
Since its invention, optical frequency comb has revolutionized a broad range of subjects from metrology to spectroscopy. The recent development of microresonator-based frequency combs (microcombs) provides a unique pathway to create frequency comb systems on a chip. Indeed, microcomb-based spectroscopy, ranging, optical synthesizer, telecommunications and astronomical calibrations have been reported recently. Critical to many of the integrated comb systems is the broad coverage of comb spectra. Here, microcombs of more than two-octave span (450 nm to 2,008 nm) is demonstrated through χ^((2)) and χ^((3)) nonlinearities in a deformed silica microcavity. The deformation lifts the circular symmetry and creates chaotic tunneling channels that enable broadband collection of intracavity emission with a single waveguide. Our demonstration introduces a new degree of freedom, cavity deformation, to the microcomb studies, and our microcomb spectral range is useful for applications in optical clock, astronomical calibration and biological imaging
EmotionGesture: Audio-Driven Diverse Emotional Co-Speech 3D Gesture Generation
Generating vivid and diverse 3D co-speech gestures is crucial for various
applications in animating virtual avatars. While most existing methods can
generate gestures from audio directly, they usually overlook that emotion is
one of the key factors of authentic co-speech gesture generation. In this work,
we propose EmotionGesture, a novel framework for synthesizing vivid and diverse
emotional co-speech 3D gestures from audio. Considering emotion is often
entangled with the rhythmic beat in speech audio, we first develop an
Emotion-Beat Mining module (EBM) to extract the emotion and audio beat features
as well as model their correlation via a transcript-based visual-rhythm
alignment. Then, we propose an initial pose based Spatial-Temporal Prompter
(STP) to generate future gestures from the given initial poses. STP effectively
models the spatial-temporal correlations between the initial poses and the
future gestures, thus producing the spatial-temporal coherent pose prompt. Once
we obtain pose prompts, emotion, and audio beat features, we will generate 3D
co-speech gestures through a transformer architecture. However, considering the
poses of existing datasets often contain jittering effects, this would lead to
generating unstable gestures. To address this issue, we propose an effective
objective function, dubbed Motion-Smooth Loss. Specifically, we model motion
offset to compensate for jittering ground-truth by forcing gestures to be
smooth. Last, we present an emotion-conditioned VAE to sample emotion features,
enabling us to generate diverse emotional results. Extensive experiments
demonstrate that our framework outperforms the state-of-the-art, achieving
vivid and diverse emotional co-speech 3D gestures.Comment: Under revie
Mixing of quasiparticle excitations and gamma-vibrations in transitional nuclei
Evidence of strong coupling of quasiparticle excitations with gamma-vibration
is shown to occur in transitional nuclei. High-spin band structures in
[166,168,170,172]Er are studied by employing the recently developed
multi-quasiparticle triaxial projected shell model approach. It is demonstrated
that a low-lying K=3 band observed in these nuclei, the nature of which has
remained unresolved, originates from the angular-momentum projection of
triaxially deformed two-quasiparticle (qp) configurations. Further, it is
predicted that the structure of this band depends critically on the shell
filling: in [166]Er the lowest K=3 2-qp band is formed from proton
configuration, in [168]Er the K=3 neutron and proton 2-qp bands are almost
degenerate, and for [170]Er and [172]Er the neutron K=3 2-qp band becomes
favored and can cross the gamma-vibrational band at high rotational
frequencies. We consider that these are few examples in even-even nuclei, where
the three basic modes of rotational, vibrational, and quasi-particle
excitations co-exist close to the yrast line.Comment: 7 pages, 6 figure
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