Article
Astronomy & Astrophysics
Fabiola Fortuna, Alejandro Ibarra, Xabier Marcano, Marcela Marin, Pablo Roig
Summary: We performed an effective field theory analysis to establish a connection between the charged lepton flavor violating processes e, -> ej gamma gamma and e, -> ej gamma. By using the current upper bounds on the rate for e, -> ej gamma, we obtained model-independent upper limits on the rates for e, -> ej gamma gamma. Our indirect limits are three orders of magnitude stronger than the direct bounds from current searches for mu -> e gamma gamma, and four orders of magnitude better than the current bounds for tau -> e gamma gamma. We also emphasized the significance of Belle II or a Super Tau Charm Facility in discovering the rare decay tau -> e gamma gamma.
Article
Optics
Timon Schapeler, Tim J. Bartley
Summary: In this study, we compare different multiplexing architectures of quantum detectors and gain insights into their photon-number-resolving ability based on the purity of measurement outcomes. We also calculate the information that each measurement outcome can extract from a given dimensional Hilbert space. Our findings confirm that increasing the number of multiplexing outcomes can improve photon-number-resolving ability, but the optimization of the splitting between those outcomes is also crucial.
Article
Microscopy
Mitsutaka Haruta, Jun Kikkawa, Koji Kimoto, Hiroki Kurata
Summary: The noise performance and detection limits of a direct-counting CMOS K2 camera and a CCD camera were evaluated in EELS experiments. The K2 camera has a lower detection limit in counting mode, but its spectral noise increases with longer dwell times. The CCD camera remains effective for long acquisition times. Therefore, choosing the appropriate camera according to experimental needs is crucial.
Article
Astronomy & Astrophysics
Jishnu Suresh, Deepali Agarwal, Sanjit Mitra
Summary: With the increasing sensitivity of gravitational wave detectors, the chances of detecting a stochastic gravitational wave background are rising. Different astrophysical and cosmological processes may generate backgrounds with distinct spectral features and sky distributions. Efficient analysis methods can accurately separate and estimate different anisotropic backgrounds, but at the cost of increased variance.
Article
Engineering, Marine
Xiaowei Li, Limin He, Xiaoming Luo, Haixiao Liu, Songtao He, Qingping Li
Summary: This paper proposed a transient steady-state analytical model and a stoppage model to evaluate uneven pig motion and estimate stoppage time. The study found that variation in friction exacerbated slippage and stimulated stoppage occurrences.
Article
Physics, Particles & Fields
H. Bonet, A. Bonhomme, C. Buck, K. Fuelber, J. Hakenmueller, J. Hempfling, G. Heusser, T. Hugle, M. Lindner, W. Maneschg, T. Rink, H. Strecker, R. Wink
Summary: We present the first constraints on the electromagnetic properties of neutrinos using data collected from the CONUS germanium detectors. The analysis provides upper limits on the effective neutrino magnetic moment and millicharge. Results show that no neutrino signal in these channels has been observed at the Brokdorf Nuclear Power Plant in Germany.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
I. Pastor-Marazuela, S. M. Straal, J. van Leeuwen, V. I. Kondratiev
Summary: Neutron stars that emit X-ray and γ-ray pulsed emissions must produce electron-positron pairs in the magnetosphere. However, some of these sources appear to be radio quiet, which raises the question of why. In this study, we conducted a deep radio search using the LOFAR radio telescope at 150 MHz for four neutron stars that are X-ray or γ-ray pulsars but have not shown any radio pulsations so far. While we did not detect pulsed emissions from these sources, we were able to establish strict upper limits on the radio flux density at 150 MHz, which provides valuable constraints for future studies.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Computer Science, Artificial Intelligence
Johannes K. Fichte, Markus Hecher, Michael Morak, Patrick Thier, Stefan Woltran
Summary: This paper presents a novel algorithm to solve projected model counting (PMC) problem, which utilizes small treewidth of the input instance and provides improvements for practical applications. The algorithm achieves promising results in solving instances with larger treewidth.
ARTIFICIAL INTELLIGENCE
(2023)
Article
Computer Science, Artificial Intelligence
Qi Zhu, Tianyu Zhou, Jing Du
Summary: Snake robots have great potential for operations in confined workplaces, but teleoperation remains challenging. This study presents an innovative haptic assistant system to enhance snake robot teleoperation in in-pipe inspections, showing improved task performance and reduced motion sickness.
ADVANCED ENGINEERING INFORMATICS
(2022)
Article
Engineering, Mechanical
Zhao Li, Pedro Lee, Mathias Fink, Ross Murch, Mark Davidson
Summary: This study proposes a passive detection method that utilizes ambient noise in water pipeline networks to extract key parameters and detect faults. Field experiments and data processing results validate the effectiveness of this method, showing similar accuracy and performance to conventional active detection methods.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Environmental
Yuqing Ni, Yong Pan, Juncheng Jiang, Yinglei Liu, Chi-Min Shu
Summary: This study developed theoretical models to predict the lower and upper flammability limits for fuel mixtures based on molecular structures with the same descriptors. The established models showed robustness, validity, and satisfactory predictability, and can be used to predict flammability limits for other fuel mixtures for which experimental values are unknown.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Agriculture, Multidisciplinary
W. Houtman, A. Siagkris-Lekkos, D. J. M. Bos, B. J. P. van den Heuvel, M. den Boer, J. Elfring, M. J. G. van de Molengraft
Summary: This paper introduces an automated flower counting method based on Multiple Hypothesis Tracking (MHT) with a connected-flower plant model. By considering multiple viewpoints of plants and correlation of flower movements, the method reduces uncertainty and validates its superiority.
COMPUTERS AND ELECTRONICS IN AGRICULTURE
(2021)
Article
Multidisciplinary Sciences
Matthew O. Clarkson, Timothy M. Lenton, Morten B. Andersen, Marie-Laure Bagard, Alexander J. Dickson, Derek Vance
Summary: The Paleocene Eocene Thermal Maximum (PETM) was a major carbon cycle and climate disruption that was associated with ocean de-oxygenation, with a limited expansion of seafloor anoxia on a global scale as indicated by carbonate associated uranium isotope data and biogeochemical modeling. The new U isotope data suggest a maximum 10-fold expansion of anoxia, covering less than 2% of seafloor area, consistent with plausible carbon emission scenarios and observations of carbon cycle recovery.
NATURE COMMUNICATIONS
(2021)
Article
Mathematics
Olha Chernukha, Yurii Bilushchak, Natalya Shakhovska, Rastislav Kulhanek
Summary: We propose and justify a numerical method for computing a double integral with variable upper limits. The method involves using simple variables as functions for the upper limits to form triangles of the integration region. By overlaying a variable grid on the integration region, we consider three cases of changes in the grid for dividing the region into elementary volumes. We derived formulas for computing the double integrals based on cubatures and triangulation division. The method's error is determined using Barrow's theorem by expanding the integral into a Taylor series. Tests on simple functions show that the method performs best when increasing the number of division elements while keeping the grid size fixed.
Article
Environmental Sciences
Edgar Mendoza, Maria G. Neves, Cristina Afonso, Rodolfo Silva, Andre Ramos, Miguel Losada
Summary: This experimental study investigates the interactions between seabed and pipelines in relation to soil liquefaction. The findings suggest that the sinking depths of pipelines can be used to verify the theoretically computed soil failure areas. It is also observed that the loss of soil loading capacity is more frequently evidenced through the fluid-like behavior of the soil. Additionally, wave action and the specific weight of the pipes seem to play crucial roles in the expected behavior of the wave-soil-pipe interaction.