Results 71 to 80 of about 1,218,885 (321)
Electronics Letters, 2023 With the advancement of manoeuvrability and the increasement of coherent processing interval (CPI), the observed target might be of multiple motion stages.
Zijing Li +3 more
doaj +1 more source
Advanced Engineering Materials, EarlyView.This study explores the mechanical performance of three auxetic structures, identifying a re‐entrant‐star hybrid as the most effective for impact absorption. Finite element simulations and experiments demonstrate significant gains in energy absorption and flexural strength after geometric optimization. This study investigates the mechanical performance
Malik Hassan +4 more
wiley +1 more source
Absolute proper motions for the calibration of the Hipparcos proper motion system [PDF]
Astronomy and Astrophysics Supplement Series, 1997 Absolute proper motions of 48 Hipparcos stars in nine elds distributed over the northern hemisphere are presented. The proper motions have been recently used as part of the Bonn program for the extragalactic link of the Hipparcos proper motion system. We describe methods which have led to the absolute proper motions of the major part of the Bonn elds ...
M. Geffert +3 more
openaire +1 more source
HST Proper Motion of Andromeda III. Another Satellite Coorbiting the M31 Satellite Plane
The Astrophysical JournalWe measure the absolute proper motion of Andromeda III (And III) using Advanced Camera for Surveys/Wide Field Channel and WFPC2 exposures spanning an unprecedented 22 yr time baseline.
Dana I. Casetti-Dinescu +7 more
doaj +1 more source
Multiple-task motion planning of non-holonomic systems with dynamics [PDF]
Mechanical Sciences, 2013 This paper addresses the motion planning problem in non-holonomic robotic systems. The system's kinematics and dynamics are represented as a control affine system with outputs.
A. Ratajczak, K. Tchoń
doaj +1 more source
Advanced Engineering Materials, EarlyView.This study investigates laser shock peening for enhancing fatigue performance of riveted aerospace aluminum joints. A comparative approach with cold expansion combines fatigue testing and synchrotron X‐ray methods. Integrating mechanical testing with residual stress and strain characterization provides insights into how different treatments affect the ...
Ogün Baris Tapar +6 more
wiley +1 more source
Advanced Engineering Materials, EarlyView.Al‐Cu intermetallic compounds (IMCs) have a significant influence on the properties of Al‐Cu bimetallic interfaces formed in compound casting. This article provides a deeper understanding of microstructure, crystallography, thermal properties, hardness, and corrosion response of Al‐Cu IMCs with the goal of facilitating the optimization of the ...
Alireza Nazarahari +7 more
wiley +1 more source
Parsec‐Scale Blazar Monitoring: Proper Motions [PDF]
The Astrophysical Journal, 2001 27 pages, 37 figures, uses emulateapj5.sty (included), ApJ in Press; very minor revisions to original ...
Homan, D. C. +6 more
openaire +2 more sources
The HST–Gaia Near-infrared Astrometric Reference Frame Near the Milky Way Galactic Center
The Astrophysical JournalWe present the first high-precision proper-motion catalog, tied to the International Celestial Reference System (ICRS), of infrared astrometric reference stars within R ≤ 25″ (1 pc) of the central supermassive black hole at the Galactic center (GC). This
Matthew W. Hosek Jr. +7 more
doaj +1 more source
A Measurement of Proper Motions of SiO Maser Sources in the Galactic Center with the VLBA
, 2007 We report on the high-precision astrometric observations of maser sources around the Galactic Center in the SiO J=1--0 v=1 and 2 lines with the VLBA during 2001 -- 2004. With phase-referencing interferometry referred to the radio continuum source Sgr A*,
Deguchi, S. +4 more
core +1 more source