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Detection of an internal density change in an anthropomorphic head phantom via tracking of charged nuclear fragments in carbon-ion radiotherapy.
Med Phys
December 2024
Heidelberg Institute for Radiation Oncology (HIRO) and National Center for Radiation Research in oncology (NCRO), Heidelberg, Germany.
Background: Carbon-ion radiotherapy provides steep dose gradients that allow the simultaneous application of high tumor doses as well as the sparing of healthy tissue and radio-sensitive organs. However, even small anatomical changes may have a severe impact on the dose distribution because of the finite range of ion beams.
Purpose: An in-vivo monitoring method based on secondary-ion emission could potentially provide feedback about the patient anatomy and thus the treatment quality.
Measuring the Spin of the Galactic Center Supermassive Black Hole with Two Pulsars.
Phys Rev Lett
December 2024
Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China.
As a key science project of the Square Kilometre Array (SKA), the discovery and timing observations of radio pulsars in the Galactic Center would provide high-precision measurements of the spacetime around the supermassive black hole, Sagittarius A* (Sgr A*), and initiate novel tests of general relativity. The spin of Sgr A* could be measured with a relative error of ≲1% by timing one pulsar with timing precision that is achievable for the SKA. However, the real measurements depend on the discovery of a pulsar in a very compact orbit, P_{b}≲0.
View Article and Find Full Text PDFExtensive Secondary Cratering From the InSight Sol 1034a Impact Event.
J Geophys Res Planets
December 2024
Institut für Geophysik, ETH Zurich Zurich Switzerland.
Impact cratering is one of the fundamental processes throughout the history of the Solar System. The formation of new impact craters on planetary bodies has been observed with repeat images from orbiting satellites. However, the time gap between images is often large enough to preclude detailed analysis of smaller-scale features such as secondary impact craters, which are often removed or buried over a short time period.
View Article and Find Full Text PDFNighttime ionospheric irregularity during intense geomagnetic storm events over the Europe-African longitudinal sector.
Heliyon
October 2024
College of Science, Department of Physics, Washera Geospace and Radar Science Research Laboratory (WaGRL), Bahir Dar University, Ethiopia.
Radio communication and navigation systems can be severely impacted by irregularities in the ionosphere. There is still much to learn about how geomagnetic storms affect the occurrence of these irregularities. Ionosphere studies in different regions, particularly the equatorial and low-latitudes, are necessary to enhance the forecasting of this phenomenon.
View Article and Find Full Text PDFSensitivity of Band-Pass Filtered In Situ Low-Earth Orbit and Ground-Based Ionosphere Observations to Lithosphere-Atmosphere-Ionosphere Coupling Over the Aegean Sea: Spectral Analysis of Two-Year Ionospheric Data Series.
Sensors (Basel)
December 2024
Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Ul. Oczapowskiego 2, 10-719 Olsztyn, Poland.
This study demonstrates a rich complexity of the time-frequency ionospheric signal spectrum, dependent on the measurement type and platform. Different phenomena contributing to satellite-derived and ground-derived geophysical data that only selected signal bands can be potentially sensitive to seismicity over time, and they are applicable in lithosphere-atmosphere-ionosphere coupling (LAIC) studies. In this study, satellite-derived and ground-derived ionospheric observations are filtered by a Fourier-based band-pass filter, and an experimental selection of potentially sensitive frequency bands has been carried out.
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