Results 61 to 70 of about 13,400 (188)

The space–time references of BeiDou Navigation Satellite System

Satellite Navigation, 2021
The BeiDou Navigation Satellite System (BDS) is essentially a precise time measurement and time synchronization system for a large-scale space near the Earth.
Chunhao Han, Li Liu, Zhiwu Cai, Yuting Lin   +3 more
doaj   +1 more source

Citrus quality grading based on statistical complexity measurement and multifractal spectrum method

浙江大学学报. 农业与生命科学版, 2015
Citrus quality grading can raise the observability degree and grade degree of citrus, improving the product level and increasing market competitiveness.
Cao Leping, Wen Zhiyuan
doaj   +1 more source

Second-order finite element discretization of Stokes equations on convex polygonal meshes

Results in Applied Mathematics
In this paper, we construct two finite element discretizations on convex polygonal meshes for the Stokes equations, using the generalized barycentric coordinates (GBCs).
Yanyan Song, Yanqiu Wang, Qiao Xin
doaj   +1 more source

DILAND: An Algorithm for Distributed Sensor Localization with Noisy Distance Measurements

, 2009
In this correspondence, we present an algorithm for distributed sensor localization with noisy distance measurements (DILAND) that extends and makes the DLRE more robust.
Kar, Soummya, Khan, Usman A., Moura, Jose M. F.   +2 more
core   +1 more source

A general relativistic model for the light propagation in the gravitational field of the Solar System: the dynamical case

, 2006
Modern astrometry is based on angular measurements at the micro-arcsecond level. At this accuracy a fully general relativistic treatment of the data reduction is required. This paper concludes a series of articles dedicated to the problem of relativistic
A. Vecchiato, B. Bucciarelli, de Felice F., F. de Felice, IAU., M. G. Lattanzi, M. T. Crosta   +6 more
core   +1 more source

Relativistic Time Transformations between the Solar System Barycenter, Earth, and Moon

The Astrophysical Journal
Relativistic corrections are essential for time transformations between geocentric, solar system barycentric, and lunicentric reference systems to account for differences in gravitational potential and relative motion.
Slava G. Turyshev, James G. Williams, Dale H. Boggs, Ryan S. Park   +3 more
doaj   +1 more source

Modified virtual internal bond model based on deformable Voronoi particles

Theoretical and Applied Mechanics Letters, 2020
: In last time, the series of virtual internal bond model was proposed for solving rock mechanics problems. In these models, the rock continuum is considered as a structure of discrete particles connected by normal and shear springs (bonds).
Oleg Konovalov, Shunying Ji, Michael Zhuravkov   +2 more
doaj   +1 more source

PyDEC: Software and Algorithms for Discretization of Exterior Calculus [PDF]

, 2011
This paper describes the algorithms, features and implementation of PyDEC, a Python library for computations related to the discretization of exterior calculus.
Bell, Nathan, Hirani, Anil N.
core   +1 more source

Advanced relativistic VLBI model for geodesy

, 2016
Our present relativistic part of the geodetic VLBI model for Earthbound antennas is a consensus model which is considered as a standard for processing high-precision VLBI observations. It was created as a compromise between a variety of relativistic VLBI
Han, Wen-Biao, Kopeikin, Sergei, Soffel, Michael   +2 more
core   +1 more source

Classification for Human Balance Capacity Based on Visual Stimulation under a Virtual Reality Environment

Sensors, 2019
The normal and disordered people balance ability classification is a key premise for rehabilitation training. This paper proposes a multi-barycentric area model (MBAM), which can be applied for accurate video analysis based classification. First, we have
Haiyan Jin, Le Xie, Zhaolin Xiao, Ting Zhou   +3 more
doaj   +1 more source