205 research outputs found
Technical Report for Argoverse Challenges on Unified Sensor-based Detection, Tracking, and Forecasting
This report presents our Le3DE2E solution for unified sensor-based detection,
tracking, and forecasting in Argoverse Challenges at CVPR 2023 Workshop on
Autonomous Driving (WAD). We propose a unified network that incorporates three
tasks, including detection, tracking, and forecasting. This solution adopts a
strong Bird's Eye View (BEV) encoder with spatial and temporal fusion and
generates unified representations for multi-tasks. The solution was tested in
the Argoverse 2 sensor dataset to evaluate the detection, tracking, and
forecasting of 26 object categories. We achieved 1st place in Detection,
Tracking, and Forecasting on the E2E Forecasting track in Argoverse Challenges
at CVPR 2023 WAD
There is a Will, There is a Way: A New Mechanism for Traffic Control Based on
Abstract-Traffic light is regarded as one of the most effective ways to alleviate traffic congestion and carbon emission problems. However, traditional traffic light cannot meet the challenges in traffic regulation posed by the fast growing number of vehicles and increasing complexity of road conditions. In this paper, we propose a dynamic traffic regulation method based on virtual traffic light (VTL) for Vehicle Ad Hoc Network (VANET). In our framework, each vehicle can express its "will"-the desire of moving forwardand share among one another its "will"-value and related traffic information at a traffic light controlled intersection. Based on the traffic information collected in real time, the virtual traffic light in our scheme can be adaptive to the changing environment. We conducted a number of simulation experiments with different scenarios using network simulator NS3 combined with traffic simulator SUMO. The results demonstrate the viability of our solution in reducing waiting time and improving the traffic efficiency
Climate control on terrestrial biospheric carbon turnover
© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Eglinton, T. I., Galy, V. V., Hemingway, J. D., Feng, X., Bao, H., Blattmann, T. M., Dickens, A. F., Gies, H., Giosan, L., Haghipour, N., Hou, P., Lupker, M., McIntyre, C. P., Montluçon, D. B., Peucker-Ehrenbrink, B., Ponton, C., Schefuß, E., Schwab, M. S., Voss, B. M., Wacker, L., Wu, Y., & Zhao, M. Climate control on terrestrial biospheric carbon turnover. Proceedings of the National Academy of Sciences of the United States of America, 118(8), (2021): e2011585118, htps://doi.org/ 10.1073/pnas.2011585118.Terrestrial vegetation and soils hold three times more carbon than the atmosphere. Much debate concerns how anthropogenic activity will perturb these surface reservoirs, potentially exacerbating ongoing changes to the climate system. Uncertainties specifically persist in extrapolating point-source observations to ecosystem-scale budgets and fluxes, which require consideration of vertical and lateral processes on multiple temporal and spatial scales. To explore controls on organic carbon (OC) turnover at the river basin scale, we present radiocarbon (14C) ages on two groups of molecular tracers of plant-derived carbon—leaf-wax lipids and lignin phenols—from a globally distributed suite of rivers. We find significant negative relationships between the 14C age of these biomarkers and mean annual temperature and precipitation. Moreover, riverine biospheric-carbon ages scale proportionally with basin-wide soil carbon turnover times and soil 14C ages, implicating OC cycling within soils as a primary control on exported biomarker ages and revealing a broad distribution of soil OC reactivities. The ubiquitous occurrence of a long-lived soil OC pool suggests soil OC is globally vulnerable to perturbations by future temperature and precipitation increase. Scaling of riverine biospheric-carbon ages with soil OC turnover shows the former can constrain the sensitivity of carbon dynamics to environmental controls on broad spatial scales. Extracting this information from fluvially dominated sedimentary sequences may inform past variations in soil OC turnover in response to anthropogenic and/or climate perturbations. In turn, monitoring riverine OC composition may help detect future climate-change–induced perturbations of soil OC turnover and stocks.This work was supported by grants from the US NSF (OCE-0928582 to T.I.E. and V.V.G.; OCE-0851015 to B.P.-E., T.I.E., and V.V.G.; and EAR-1226818 to B.P.-E.), Swiss National Science Foundation (200021_140850, 200020_163162, and 200020_184865 to T.I.E.), and National Natural Science Foundation of China (41520104009 to M.Z.)
Observation of many-body Fock space dynamics in two dimensions
Quantum many-body simulation provides a straightforward way to understand
fundamental physics and connect with quantum information applications. However,
suffering from exponentially growing Hilbert space size, characterization in
terms of few-body probes in real space is often insufficient to tackle
challenging problems such as quantum critical behavior and many-body
localization (MBL) in higher dimensions. Here, we experimentally employ a new
paradigm on a superconducting quantum processor, exploring such elusive
questions from a Fock space view: mapping the many-body system onto an
unconventional Anderson model on a complex Fock space network of many-body
states. By observing the wave packet propagating in Fock space and the
emergence of a statistical ergodic ensemble, we reveal a fresh picture for
characterizing representative many-body dynamics: thermalization, localization,
and scarring. In addition, we observe a quantum critical regime of anomalously
enhanced wave packet width and deduce a critical point from the maximum wave
packet fluctuations, which lend support for the two-dimensional MBL transition
in finite-sized systems. Our work unveils a new perspective of exploring
many-body physics in Fock space, demonstrating its practical applications on
contentious MBL aspects such as criticality and dimensionality. Moreover, the
entire protocol is universal and scalable, paving the way to finally solve a
broader range of controversial many-body problems on future larger quantum
devices.Comment: 8 pages, 4 figures + supplementary informatio
Challenges in QCD matter physics - The Compressed Baryonic Matter experiment at FAIR
Substantial experimental and theoretical efforts worldwide are devoted to
explore the phase diagram of strongly interacting matter. At LHC and top RHIC
energies, QCD matter is studied at very high temperatures and nearly vanishing
net-baryon densities. There is evidence that a Quark-Gluon-Plasma (QGP) was
created at experiments at RHIC and LHC. The transition from the QGP back to the
hadron gas is found to be a smooth cross over. For larger net-baryon densities
and lower temperatures, it is expected that the QCD phase diagram exhibits a
rich structure, such as a first-order phase transition between hadronic and
partonic matter which terminates in a critical point, or exotic phases like
quarkyonic matter. The discovery of these landmarks would be a breakthrough in
our understanding of the strong interaction and is therefore in the focus of
various high-energy heavy-ion research programs. The Compressed Baryonic Matter
(CBM) experiment at FAIR will play a unique role in the exploration of the QCD
phase diagram in the region of high net-baryon densities, because it is
designed to run at unprecedented interaction rates. High-rate operation is the
key prerequisite for high-precision measurements of multi-differential
observables and of rare diagnostic probes which are sensitive to the dense
phase of the nuclear fireball. The goal of the CBM experiment at SIS100
(sqrt(s_NN) = 2.7 - 4.9 GeV) is to discover fundamental properties of QCD
matter: the phase structure at large baryon-chemical potentials (mu_B > 500
MeV), effects of chiral symmetry, and the equation-of-state at high density as
it is expected to occur in the core of neutron stars. In this article, we
review the motivation for and the physics programme of CBM, including
activities before the start of data taking in 2022, in the context of the
worldwide efforts to explore high-density QCD matter.Comment: 15 pages, 11 figures. Published in European Physical Journal
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