Results 1 to 10 of about 7,219 (25)

Motion-Aware Robotic 3D Ultrasound [PDF]

2021 IEEE International Conference on Robotics and Automation (ICRA), 2021
Robotic three-dimensional (3D) ultrasound (US) imaging has been employed to overcome the drawbacks of traditional US examinations, such as high inter-operator variability and lack of repeatability. However, object movement remains a challenge as unexpected motion decreases the quality of the 3D compounding. Furthermore, attempted adjustment of objects,
arxiv   +1 more source

Precise Repositioning of Robotic Ultrasound: Improving Registration-based Motion Compensation using Ultrasound Confidence Optimization [PDF]

, 2022
Robotic ultrasound (US) imaging has been seen as a promising solution to overcome the limitations of free-hand US examinations, i.e., inter-operator variability. However, the fact that robotic US systems cannot react to subject movements during scans limits their clinical acceptance.
arxiv   +1 more source

Phantom maps and rational homotopy [PDF]

arXiv, 2021
We generalize theorems of McGibbon-Roitberg, Iriye, and Meier on the relations between phantom maps and rational homotopy, and apply them to provide new calculational examples of the homotopy sets Ph(X, Y ) of phantom maps and the subsets SPh(X, Y ) of special phantom maps.
arxiv  

HST observations of the limb polarization of Titan [PDF]

A&A 572, A6 (2014), 2014
Titan is an excellent test case for detailed studies of the scattering polarization from thick hazy atmospheres. We present the first limb polarization measurements of Titan, which are compared as a test to our limb polarization models. Previously unpublished imaging polarimetry from the HST archive is presented which resolves the disk of Titan.
arxiv   +1 more source

Phantom-Like Behavior in Modified Teleparallel Gravity [PDF]

Advances in High Energy Physics, 4026856, 2019, 2019
The recent data from Planck2018 shows that the equation of state parameter of effective cosmic fluid today is w0 =-1.03. This indicates that it is possible for the universe to be in a phantom dominated era today. While a phantom field is essentially capable to explain this observation, it suffers from some serious problems such as instabilities and ...
arxiv   +1 more source

A Method for Self-Service Rehabilitation Training of Human Lower Limbs [PDF]

arXiv, 2022
In recent years, the research of rehabilitation robot technology has become a hotspot in the field of rehabilitation medicine engineering and robotics. To assist active rehabilitation in patients with unilateral lower extremity injury, we propose a new self-service rehabilitation training method to control the injured lower extremity through its ...
arxiv  

Comparison of limb-darkening laws from plane-parallel and spherically-symmetric model stellar atmospheres [PDF]

, 2011
Limb-darkening is a fundamental constraint for modeling eclipsing binary and planetary transit light curves. As observations, for example from Kepler, CoRot, and Most, become more precise then a greater understanding of limb-darkening is necessary. However, limb-darkening is typically modeled as simple parameterizations fit to plane-parallel model ...
arxiv   +1 more source

Limb polarization of Uranus and Neptune. II Spectropolarimetric observations [PDF]

Astron.Astrophys. 24 (2006) 11, 2006
We have detected a strong limb polarization for Uranus and Neptune. With spectropolarimetric observations we characterize the spectral dependence of this limb polarization and explore the diagnostic potential for investigating the distribution and properties of the scattering particles.
arxiv   +1 more source

Crossing the phantom divide without phantom matter [PDF]

JCAP 0609 (2006) 004, 2006
A class of braneworld models can lead to phantom-like acceleration of the late universe, but without the need for any phantom matter. In the simplest models, the universe contains only cold dark matter and a cosmological constant. We generalize these models by introducing a quintessence field. The new feature in our models is that quintessence leads to
arxiv   +1 more source

Wormholes supported by a phantom energy [PDF]

Phys.Rev. D71 (2005) 043520, 2005
We extend the notion of phantom energy--which is generally accepted for homogeneously distributed matter with $w<-1$ in the universe--on inhomogeneous spherically symmetric spacetime configurations. A spherically symmetric distribution of phantom energy is shown to be able to support the existence of static wormholes.
arxiv   +1 more source