Results 41 to 50 of about 63,794 (294)

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

Influence of an Argon/Silane Atmosphere on the Temperature of a Thermal Plasma

Advanced Engineering Materials, EarlyView.
The influence of a silane‐doped argon atmosphere on the chemical composition and temperature of a thermal nontransferring argon plasma is investigated using optical emission spectroscopy. As a result of the high amount of free electrons resulting from the stepwise ionization and dissociation of the silane molecule, even a silane addition of 0.01 vol ...
Lena Kreie, David Kramer, Thomas Scheithauer, Hans Jürgen Maier, Thomas Hassel   +4 more
wiley   +1 more source

Leveraging Multi-LEO Satellite Signals for Opportunistic Positioning

IEEE Access
The study of navigation solutions other than GNSS is becoming increasingly important due to growing concerns about the vulnerability of GNSS to interference. The use of existing LEO satellite signals is a promising option in this respect.
Nabil Jardak, Ronan Adam, Quentin Jault
doaj   +1 more source

Symposium on satellite Doppler positioning

Eos, Transactions American Geophysical Union, 1979
The Second International Geodetic Symposium on Satellite Doppler Positioning was held in Austin, Texas, from January 22 to January 26,1979. The symposium was sponsored by the Defense Mapping Agency and the National Ocean Survey, hosted by the Applied Research Laboratories of the University of Texas at Austin, and sanctioned by the International ...
openaire   +1 more source

Orbiter-orbiter and orbiter-lander tracking using same-beam interferometry [PDF]

, 1992
Two spacecraft orbiting Mars will subtend a small angle as viewed from Earth. This angle will usually be smaller than the beam width of a single radio antenna. Thus the two spacecraft may be tracked simultaneously by a single Earth-based antenna.
Border, J. S., Folkner, W. M.
core   +1 more source

Influence of Doppler Bin Width on GPS Acquisition Probabilities

, 2013
Acquisition is a search in two continuous dimensions, where the digital algorithms require a partitioning of the search space into cells. Depending on the partitioning of the Doppler frequency domain, more than one cell might contain significant signal ...
Geiger, Bernhard C., Vogel, Christian
core   +1 more source

Poly(lactic‐co‐glycolic acid) Nanoparticles for IL‐12 Self‐Amplifying RNA Delivery in Glioblastoma Models

Advanced Functional Materials, EarlyView.
xxxx. ABSTRACT Glioblastoma (GBM) remains one of the most lethal brain cancers, with median survival rarely exceeding 15 months after diagnosis. Interleukin‐12 (IL‐12) is a potent immunostimulatory cytokine capable of reshaping the tumor microenvironment (TME), yet its clinical translation is hindered by systemic toxicity and short half‐life. RNA‐based
Fatima Hameedat, Johan Sebastian Lopez‐Parra, Willem M. H. Hoogaars, Emma Dijkstra, Cynthia Huang, Irafasha C. Casmil, Anna K. Blakney, Peter Olinga, Barbara Rothen‐Rutishauser, Hélder A. Santos, Alke Petri‐Fink, Flávia Sousa   +11 more
wiley   +1 more source

Joint pseudo-range and Doppler positioning method with LEO Satellites‘ signals of opportunity

Satellite Navigation
Low Earth Orbit (LEO) satellites, with their wide coverage and large number, have gradually become a crucial platform and means for navigation and positioning services. Compared to other LEO constellations, Starlink has over 6000 satellites in orbit, and
Ying Xu, Yue Liu, Ming Lei, Ming Gao, Zhibo Fang, Cheng Jiang   +5 more
doaj   +1 more source

Safety and Efficacy of Intraoperative Doppler Sonography-Assisted Cervical Pedicle Screw Fixation—A Retrospective Comparison with Conventional Pedicle Screw Implantation

Global Spine Journal, 2023
Study Design A Retrospective Cohort Study. Objective To introduce a new Doppler sonography-assisted pedicle screw fixation technique that enables vertebral artery (VA) monitoring during surgery and compares the accuracies of Doppler sonography-assisted ...
Sang Hyo Lee MD, Jong-Hyeok Park MD, Jong Beom Lee MD, Ho Jin Lee MD PhD, Il Sup Kim MD PhD, Jeong Woo Hur MD, Jae Taek Hong MD PhD   +6 more
doaj   +1 more source

An automated multi-point primary vibration calibration system

Measurement: Sensors, 2021
In this study, we developed an automated, multi-point primary vibration calibration system using a two-axis positioning stage and a laser Doppler vibrometer. The proposed system offers low-cost, convenient, and automated multi-point vibration calibration,
Wataru Kokuyama, Tomofumi Shimoda, Hideaki Nozato   +2 more
doaj   +1 more source