4,402 research outputs found
Primordial black holes from an inflationary potential valley
Primordial black holes (PBHs) could be formed if large perturbations are
generated on small scales in inflation. We study a toy inflation model with a
local minimum. The curvature perturbations are enhanced when the inflaton
passes through the local minimum, with more efficient amplification rate than
that of quasi-inflection point inflation, leading to the production of PBHs on
small scales. The PBHs could comprise the total dark matter in the mass window
--g.Comment: 7 pages,4 figure
Using inductive Energy Participation Ratio for Superconducting Quantum Chip Characterization
We have developed an inductive energy participation ratio (iEPR) method and a
concise procedure for superconducting quantum chip layout simulation and
verification that is increasingly indispensable in large-scale, fault-tolerant
quantum computing. It can be utilized to extract the characteristic parameters
and the bare Hamiltonian of the layout in an efficient way. In theory, iEPR
sheds light on the deep-seated relationship between energy distribution and
representation transformation. As a stirring application, we apply it to a
typical quantum chip layout, obtaining all the crucial characteristic
parameters in one step that would be extremely challenging through the existing
methods. Our work is expected to significantly improve the simulation and
verification techniques and takes an essential step toward quantum electronic
design automation
DeNoising-MOT: Towards Multiple Object Tracking with Severe Occlusions
Multiple object tracking (MOT) tends to become more challenging when severe
occlusions occur. In this paper, we analyze the limitations of traditional
Convolutional Neural Network-based methods and Transformer-based methods in
handling occlusions and propose DNMOT, an end-to-end trainable DeNoising
Transformer for MOT. To address the challenge of occlusions, we explicitly
simulate the scenarios when occlusions occur. Specifically, we augment the
trajectory with noises during training and make our model learn the denoising
process in an encoder-decoder architecture, so that our model can exhibit
strong robustness and perform well under crowded scenes. Additionally, we
propose a Cascaded Mask strategy to better coordinate the interaction between
different types of queries in the decoder to prevent the mutual suppression
between neighboring trajectories under crowded scenes. Notably, the proposed
method requires no additional modules like matching strategy and motion state
estimation in inference. We conduct extensive experiments on the MOT17, MOT20,
and DanceTrack datasets, and the experimental results show that our method
outperforms previous state-of-the-art methods by a clear margin.Comment: ACM Multimedia 202
Bimanual Microincision Cataract Surgery versus Coaxial Microincision Cataract Surgery: A Meta-Analysis of Randomized Controlled Trials and Cohort Studies
Purpose. This meta-analysis was conducted to compare the intraoperative and postoperative outcomes of bimanual microincision cataract surgery (B-MICS) and coaxial microincision cataract surgery (C-MICS). Methods. Three databases were searched for papers that compared B-MICS and C-MICS from inception to June 2016. The following intraoperative and postoperative outcomes were included in the final meta-analysis: ultrasound time (UST), effective phacoemulsification time (EPT), balanced salt solution use (BSS use), mean surgery time, best-corrected visual acuity (BCVA), central corneal thickness (CCT), and increased CCT. Results. There were no statistically significant differences in mean surgery time, UST, BSS use, BCVA, CCT, or increased CCT (one subgroup at postoperative day 7-8 and another subgroup at postoperative day 30). However, there was less EPT needed during surgery (p<0.01) and lower levels of increased CCT at postoperative day 1 (p=0.02) in the B-MICS group compared with the C-MICS group. Conclusions. The EPT was shorter and increased CCT was less at postoperative day 1 in the B-MICS group. There were no statistically significant differences in other intraoperative and postoperative outcomes between the B-MICS group and the C-MICS group. B-MICS is an efficient and safe cataract surgery procedure
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