Results 51 to 60 of about 1,691 (159)

Adaptive Centroidal Voronoi Tessellation With Agent Dropout and Reinsertion for Multi-Agent Non-Convex Area Coverage

IEEE Access
Voronoi diagrams are widely used for area partitioning and coverage control. Nevertheless, their utilization in non-convex domains often necessitates additional computational procedures, such as diffeomorphism application, geodesic distance calculations,
Kangneoung Lee, Kiju Lee
doaj   +1 more source

Neutrino oscillations in the background of a black hole embedded in an expanding Universe

Nuclear Physics B
In this paper, we will study the phenomenon of neutrino oscillations when traveling through the gravitational field of a black hole embedded in a spatially homogeneous and isotropic flat universe.
Daniele Gregoris
doaj   +1 more source

Lifting Klein-Gordon/Einstein solutions to general nonlinear sigma-models: the wormhole example

Journal of High Energy Physics
We describe a simple technique for generating solutions to the classical field equations for an arbitrary nonlinear sigma-model minimally coupled to gravity.
Philippe Brax, C. P. Burgess, F. Quevedo
doaj   +1 more source

Implications in adjusting a gravity network with observations medium or independent: analysis of precision and reliability [PDF]

Revista Brasileira de Cartografia, 2005
Adjustment strategies associated to the methodology applied used to the implantation of a gravity network of high precision in Paraná are presented. A network was implanted with stations in 21 places in the State of Paraná and one in the state of São ...
Pedro L. Faggion, Camil Gemael, Sílvio R. C. de Freitas, Guataçara dos S. Junior   +3 more
doaj  

Method of fundamental solutions based on geodesic distance for in homogeneous inverse heat conduction problems in anisotropic medium(基于测地距离的基本解方法求解非齐次各向异性IHCP问题)

Zhejiang Daxue xuebao. Lixue ban, 2009
提出了一种求解非齐次各向异性热传导方程一类反问题IHCP(inverse heat conduction problem）的无网格方法,该方法通过借助基于测地距离的Multiquadric(MQ）作为基函数得到整个时间空间区域上的一个近似特解,然后用基于测地距离的基本解方法直接在整个时间空间区域上对相应的齐次问题进行求解.用截断奇异值分解(TSVD)法求解所得病态线性方程组,用L-曲线准则确定正则化参数.用数值例子验证了该方法的有效性,并分析了数值解的精度与参数T、c的关系.
WANGJin-yu(王金玉), SUNFang-yu(孙方裕)   +1 more
doaj   +1 more source

Computed Tomography–Based Quantitative Morphometry Reveals Distinct Airway Remodelling in COVID-19 versus Community-Acquired Pneumonia

Journal of Basic and Applied Research in Biomedicine
Purpose: To quantitatively characterize airway structural changes in COVID-19 and compare them to those observed in community-acquired pneumonia (CAP), using computed tomography (CT)-based Morphometry. The study aims to evaluate whether COVID-19 and CAP
Gihad Ibrahim
doaj   +1 more source

GEODESIC VECTORS ON $5$-DIMENSIONAL HOMOGENEOUS NILMANIFOLDS

Matematički Vesnik
Summary: In this paper, firstly we study geodesic vectors for the \(m\)-th root homogeneous Finsler space admitting \((\alpha,\beta)\)-type. Then we obtain the necessary and sufficient condition for an arbitrary non-zero vector to be a geodesic vector for the \(m\)-th root homogeneous Finsler metric under mild conditions. Finally, we consider a quartic
Shanker, Gauree, Kaur, Jaspreet, Jangir, Seema   +2 more
openaire   +2 more sources

Differing Manifestations of Spatial Curvature in Cosmological FRW Models

Universe
We found statistical evidence for a mismatch between the (global) spatial curvature parameter K in the geodesic equation for incoming photons and the corresponding parameter in the Friedmann equation that determines the time evolution of the background ...
Meir Shimon, Yoel Rephaeli
doaj   +1 more source

The Motion of Point Particles in Curved Spacetime

Living Reviews in Relativity, 2004
This review is concerned with the motion of a point scalar charge, a point electric charge, and a point mass in a specified background spacetime. In each of the three cases the particle produces a field that behaves as outgoing radiation in the wave zone,
Poisson Eric
doaj  

The Motion of Point Particles in Curved Spacetime

Living Reviews in Relativity, 2011
This review is concerned with the motion of a point scalar charge, a point electric charge, and a point mass in a specified background spacetime. In each of the three cases the particle produces a field that behaves as outgoing radiation in the wave zone,
Eric Poisson, Adam Pound, Ian Vega
doaj