Results 21 to 30 of about 11,575,804 (317)

Coronavirus at the end of the world: Antarctica matters

open access: yesSocial Sciences and Humanities Open, 2020
The potential impact of coronavirus in Antarctica through tourism and scientific research as well as the Antarctic Treaty System is reviewed over three time periods.
Bob Frame, Alan D. Hemmings
doaj   +1 more source

Rate-Distortion Optimization Based on Two-Pass Encoding for HEVC

open access: yesIEEE Access, 2021
Rate-distortion optimization (RDO) is a crucial technique in block-based hybrid video encoders, which determines the coding option for a certain coding unit to achieve optimal rate-distortion (R-D) performance.
Hongwei Guo   +4 more
doaj   +1 more source

Robust gait recognition from extremely low frame-rate videos [PDF]

open access: yes, 2013
In this paper, we propose a gait recognition method for extremely low frame-rate videos. Different from the popular temporal reconstruction-based methods, the proposed method uses the average gait over the whole sequence as input feature template ...
Choudhury, Sruti Das   +2 more
core   +1 more source

Non-singular pre-big bang scenarios from all-order α′ corrections

open access: yesJournal of High Energy Physics, 2023
We reformulate in Hamiltonian language the recent proposal by Hohm and Zwiebach of an action yielding the most general O(d, d)-symmetric string cosmology equations, at tree-level in the string-loop expansion, but to all orders in the α′ expansion.
M. Gasperini, G. Veneziano
doaj   +1 more source

Requirements and Hardware Limitations of High-Frame-Rate 3-D Ultrasound Imaging Systems

open access: yesApplied Sciences, 2022
The spread of high frame rate and 3-D imaging techniques has raised pressing requirements for ultrasound systems. In particular, the processing power and data transfer rate requirements may be so demanding to hinder the real-time (RT) implementation of ...
Claudio Giangrossi   +6 more
doaj   +1 more source

Free constructions and coproducts of d-frames

open access: yesCoRR, 2017
A general theory of presentations for d-frames does not yet exist. We review the difficulties and give sufficient conditions for when they can be overcome. As an application we prove that the category of d-frames is closed under coproducts.
Jakl, Tomás, Jung, Achim
openaire   +4 more sources

Approximating Dynamic Elastic Modulus of Concrete for an Old Aqueduct Using Dynamic Tests and BP Neural Network

open access: yesApplied Sciences, 2023
Monitoring the degradation of the dynamic elastic modulus (Ed) of concrete is of great importance to track the durability deterioration for hydraulic concrete structures.
Xiaobin Lu, Xiulin Li, Jun Xiao, Meng Li
doaj   +1 more source

Stellar Half-mass Radii of 0.5 z < 2.3 Galaxies: Comparison with JWST/NIRCam Half-light Radii

open access: yesThe Astrophysical Journal, 2023
We  use CEERS JWST/NIRCam imaging to measure rest-frame near-IR light profiles of 435 M _⋆ > 10 ^10 M _⊙ galaxies in the redshift range of 0.5 < z < 2.3.
Arjen van der Wel   +15 more
doaj   +1 more source

Hysteretic Characteristics of Wood-Frame Structures Under Seismic Motions [PDF]

open access: yes, 2009
In order to develop seismic codes that can effectively mitigate damage to wood-frame construction under seismic activity, the dynamic characteristics of wood-frame buildings must be well understood.
Sutoyo, Daniel
core   +1 more source

A Hybrid 3D Descriptor With Global Structural Frames and Local Signatures of Histograms

open access: yesIEEE Access, 2018
An effective feature descriptor is important for the 3-D object recognition and reconstruction. This paper presents a novel 3-D Frame-signature of histograms of orientation (SHOT) descriptor which combines the global structural frame with local surface ...
Zhiqiang Shen, Xin Ma, Yibin Li
doaj   +1 more source

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