1,779 research outputs found
Detectable MeV neutrinos from black hole neutrino-dominated accretion flows
Neutrino-dominated accretion flows (NDAFs) around rotating stellar-mass black
holes (BHs) have been theorized as the central engine of relativistic jets
launched in massive star core collapse events or compact star mergers. In this
work, we calculate the electron neutrino/anti-neutrino spectra of NDAFs by
fully taking into account the general relativistic effects, and investigate the
effects of viewing angle, BH spin, and mass accretion rate on the results. We
show that even though a typical NDAF has a neutrino luminosity lower than that
of a typical supernova (SN), it can reach
peaking at MeV, making them potentially detectable with the upcoming
sensitive MeV neutrino detectors if they are close enough to Earth. Based on
the observed GRB event rate in the local universe and requiring that at least 3
neutrinos are detected to claim a detection, we estimate a detection rate up to
(0.10-0.25) per century for GRB-related NDAFs by the Hyper-Kamiokande
(Hyper-K) detector if one neglects neutrino oscillation. If one assumes that
all Type Ib/c SNe have an engine-driven NDAF, the Hyper-K detection rate would
be (1-3) per century. By considering neutrino oscillations, the
detection rate may decrease by a factor of 2-3. Detecting one such event would
establish the observational evidence of NDAFs in the universe.Comment: 7 pages, 2 figures, 2 tables, accepted for publication in PR
EMP-SSL: Towards Self-Supervised Learning in One Training Epoch
Recently, self-supervised learning (SSL) has achieved tremendous success in
learning image representation. Despite the empirical success, most
self-supervised learning methods are rather "inefficient" learners, typically
taking hundreds of training epochs to fully converge. In this work, we show
that the key towards efficient self-supervised learning is to increase the
number of crops from each image instance. Leveraging one of the
state-of-the-art SSL method, we introduce a simplistic form of self-supervised
learning method called Extreme-Multi-Patch Self-Supervised-Learning (EMP-SSL)
that does not rely on many heuristic techniques for SSL such as weight sharing
between the branches, feature-wise normalization, output quantization, and stop
gradient, etc, and reduces the training epochs by two orders of magnitude. We
show that the proposed method is able to converge to 85.1% on CIFAR-10, 58.5%
on CIFAR-100, 38.1% on Tiny ImageNet and 58.5% on ImageNet-100 in just one
epoch. Furthermore, the proposed method achieves 91.5% on CIFAR-10, 70.1% on
CIFAR-100, 51.5% on Tiny ImageNet and 78.9% on ImageNet-100 with linear probing
in less than ten training epochs. In addition, we show that EMP-SSL shows
significantly better transferability to out-of-domain datasets compared to
baseline SSL methods. We will release the code in
https://github.com/tsb0601/EMP-SSL
Reverse Diffusion Monte Carlo
We propose a Monte Carlo sampler from the reverse diffusion process. Unlike
the practice of diffusion models, where the intermediary updates -- the score
functions -- are learned with a neural network, we transform the score matching
problem into a mean estimation one. By estimating the means of the regularized
posterior distributions, we derive a novel Monte Carlo sampling algorithm
called reverse diffusion Monte Carlo (rdMC), which is distinct from the Markov
chain Monte Carlo (MCMC) methods. We determine the sample size from the error
tolerance and the properties of the posterior distribution to yield an
algorithm that can approximately sample the target distribution with any
desired accuracy. Additionally, we demonstrate and prove under suitable
conditions that sampling with rdMC can be significantly faster than that with
MCMC. For multi-modal target distributions such as those in Gaussian mixture
models, rdMC greatly improves over the Langevin-style MCMC sampling methods
both theoretically and in practice. The proposed rdMC method offers a new
perspective and solution beyond classical MCMC algorithms for the challenging
complex distributions.Comment: 44 pages, 16 figures, ICLR 202
PhysBench: A Benchmark Framework for rPPG with a New Dataset and Baseline
In recent years, due to the widespread use of internet videos, physiological
remote sensing has gained more and more attention in the fields of affective
computing and telemedicine. Recovering physiological signals from facial videos
is a challenging task that involves a series of preprocessing, image
algorithms, and post-processing to finally restore waveforms. We propose a
complete and efficient end-to-end training and testing framework that provides
fair comparisons for different algorithms through unified preprocessing and
post-processing. In addition, we introduce a highly synchronized lossless
format dataset along with a lightweight algorithm. The dataset contains over 32
hours (3.53M frames) of video from 58 subjects; by training on our collected
dataset both our proposed algorithm as well as existing ones can achieve
improvements
Transient analysis of arm locking controller
Arm locking is one of the key technologies to suppress the laser phase noise
in spaced-based gravitational waves observatories. Since arm locking was
proposed, phase margin criterion was always used as the fundamental design
strategy for the controller development. In this paper, we find that this
empirical method from engineering actually cannot guarantee the arm locking
stability. Therefore, most of the advanced arm locking controllers reported so
far may have instable problems. After comprehensive analysis of the single arm
locking's transient responses, strict analytical stability criterions are
summarized for the first time. These criterions are then generalized to dual
arm locking, modified-dual arm locking and common arm locking, and special
considerations for the design of arm locking controllers in different
architectures are also discussed. It is found that PI controllers can easily
meet our stability criterions in most of the arm locking systems. Using a
simple high gain PI controller, it is possible to suppress the laser phase
noise by 5 orders of magnitude within the science band. Our stability
criterions can also be used in other feedback systems, where several modules
with different delays are connected in parallel.Comment: 24 pages, 24 figure
Alcohol Consumption and Ankle-to-Brachial Index: Results from the Cardiovascular Risk Survey
BACKGROUND AND METHODOLOGY: A low ankle-to-brachial index (ABI) is a strong correlate of cardiovascular disease and subsequent mortality. The relationship between ABI and alcohol consumption remains unclear. Data are from the Cardiovascular Risk Survey (CRS), a multiple-ethnic, community-based, cross-sectional study of 14,618 Chinese people (5757 Hans, 4767 Uygurs, and 4094 Kazakhs) aged 35 years and over at baseline from Oct. 2007 to March 2010. The relationship between alcohol intake and ABI was determined by use of analysis of covariance and multivariable regressions. PRINCIPAL FINDINGS: In men, alcohol consumption was significantly associated with ABI (P<0.001). After adjusted for the confounding factors, such as age, sex, ethnicity, body mass index, smoking, work stress, diabetes, and fasting blood glucose, the difference remained significant (P<0.001); either the unadjusted or multivariate-adjusted odds ratio (OR) for peripheral artery disease (PAD) was significantly higher in men who consumed >60.0 g/d [OR = 3.857, (95% CI: 2.555-5.824); OR = 2.797, (95% CI: 1.106-3.129); OR = 2.878, (95% CI: 1.215-4.018); respectively] and was significantly lower in men who consumed 20.1-40.0 g/d [OR= 0.330, (95% CI: 0.181-0.599); OR = 0.484, (95% CI: 0.065-0.894); OR = 0.478, (95% CI: 0.243-1.534); respectively] and 40.1-60.0 g/d [OR= 0.306, (95% CI: 0.096-0.969); OR = 0.267, (95% CI: 0.087-0.886); OR = 0.203, (95% CI: 0.113-0.754); respectively] compared with never drinking, respectively (all P<0.01). Neither in unadjusted nor in multivariate-adjusted model was the association between ABI and alcohol consumption significant (all P>0.05) in women. Similarly, PAD was not correlated with alcohol intake in women (all P>0.05). CONCLUSIONS/SIGNIFICANCE: Our results indicated that in Chinese men, alcohol consumption was associated with peripheral artery disease, and consumption of less than 60 g/d had an inverse association with peripheral atherosclerosis whereas consumption of 60 g/d or more had a positive association
- …