M. Krämer
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View article: Reproduction package for "Equation-of-state-informed pulse profile modeling"
Reproduction package for "Equation-of-state-informed pulse profile modeling" Open
Data files, python scripts, and notebooks to reproduce the output of the paper "Equation-of-state-informed pulse profile modeling" by Hoogkamer and Rutherford et al. (2025; arXiv:2510.27619 ). Please refer to the README for detailed inform…
View article: Localisation and host galaxy identification of new Fast Radio Bursts with MeerKAT
Localisation and host galaxy identification of new Fast Radio Bursts with MeerKAT Open
Accurately localising fast radio bursts (FRBs) is essential for understanding their birth environments and for their use as cosmological probes. Recent advances in radio interferometry, particularly with MeerKAT, have enabled the localisat…
View article: Toward a Comprehensive Exploration of Flavored Dark Matter Models
Toward a Comprehensive Exploration of Flavored Dark Matter Models Open
We present a comprehensive framework for the study of flavored dark matter models, combining relic density calculations with direct and indirect detection limits, collider constraints, and a global analysis of flavor observables based on S…
View article: A Multi-Scale Windowed Spatial and Channel Attention Network for High-Fidelity Remote Sensing Image Super-Resolution
A Multi-Scale Windowed Spatial and Channel Attention Network for High-Fidelity Remote Sensing Image Super-Resolution Open
Remote sensing image super-resolution (SR) plays a crucial role in enhancing the quality and resolution of satellite and aerial imagery, which is essential for various applications, including environmental monitoring and urban planning. Wh…
View article: The double neutron star PSR J1946+2052
The double neutron star PSR J1946+2052 Open
Aims. Double neutron star (DNS) systems are superb laboratories for testing theories of gravity and constraining the equation of state of ultra-dense matter. PSR J1946+2052 is a particularly intriguing DNS system due to its orbital period …
View article: Discovery of 30 Galactic radio transient pulsars with MeerTRAP
Discovery of 30 Galactic radio transient pulsars with MeerTRAP Open
We present the discovery of 30 new Galactic sources from the MeerTRAP project, a commensal fast radio transient search programme using the MeerKAT telescope. These sources were all identified via a single-pulse search. Most of them are lik…
View article: The double neutron star PSR J1946+2052 I. Masses and tests of general relativity
The double neutron star PSR J1946+2052 I. Masses and tests of general relativity Open
We conducted high-precision timing of PSR J1946+2052 to determine the masses of the two neutron stars in the system, test general relativity (GR) and assessed the system's potential for future measurement of the moment of inertia of the pu…
View article: Combining the second data release of the European Pulsar Timing Array with low-frequency pulsar data
Combining the second data release of the European Pulsar Timing Array with low-frequency pulsar data Open
Context. Low radio frequency data are highly valuable for enhancing the sensitivity of pulsar timing arrays (PTAs) to propagation effects, such as dispersion measure (DM) variations. These low-frequency observations are particularly sensit…
View article: Combining the second data release of the European Pulsar Timing Array with low-frequency pulsar data
Combining the second data release of the European Pulsar Timing Array with low-frequency pulsar data Open
Low-frequency radio data improve the sensitivity of pulsar timing arrays (PTAs) to propagation effects such as dispersion measure (DM) variations, enabling better noise characterization essential for detecting the stochastic gravitational …
View article: Multiwavelength observations of a new black-widow millisecond pulsar PSR J1544-2555
Multiwavelength observations of a new black-widow millisecond pulsar PSR J1544-2555 Open
We report the discovery of a new black-widow millisecond pulsar, PSR J1544-2555, associated with the Fermi-LAT source 4FGL J1544.2-2554. Optical, radio, and gamma-ray observations confirmed its nature as a compact spider binary system. Opt…
View article: Revealing the Unseen: The Discovery of Long-Awaited Radiation from the Intermittent Pulsar PSR B1931+24
Revealing the Unseen: The Discovery of Long-Awaited Radiation from the Intermittent Pulsar PSR B1931+24 Open
Pulsars are typically characterized by their stable, highly magnetized, and fast-rotating nature, which underpins their persistent radio emissions. However, the discovery of prolonged radio-quiet ("off") states in intermittent pulsars, suc…
View article: Drivers and implications of declining fossil fuel CO <sub>2</sub> in Chinese cities revealed by radiocarbon measurements
Drivers and implications of declining fossil fuel CO <sub>2</sub> in Chinese cities revealed by radiocarbon measurements Open
China’s clean air policies have successfully mitigated fossil fuel CO2 (CO2ff) emissions in bottom-up inventories since 2013. Yet, evidence from top-down measurements and their underlying drivers remains lacking. Here, we quantify CO2ff co…
View article: Enhancing Geomagnetic Navigation with PPO-LSTM: Robust Navigation Utilizing Observed Geomagnetic Field Data
Enhancing Geomagnetic Navigation with PPO-LSTM: Robust Navigation Utilizing Observed Geomagnetic Field Data Open
Geospatial navigation in GPS-denied environments presents significant challenges, particularly for autonomous vehicles operating in complex, unmapped regions. We explore the Earth’s geomagnetic field, a globally distributed and naturally o…
View article: Geostress in the Ordovician system of the northern segment of the Shunbei No. 4 fault zone based on finite element simulation
Geostress in the Ordovician system of the northern segment of the Shunbei No. 4 fault zone based on finite element simulation Open
The principal focus of geostress studies in the Shunbei area has been on stress measurements, one-dimensional stress profiles, and the stress distribution across planes. However, research on the three-dimensional (3-D) geostress field of t…
View article: Slow and steady: long-term evolution of the 76-s pulsar J0901−4046
Slow and steady: long-term evolution of the 76-s pulsar J0901−4046 Open
PSR J0901−4046, a likely radio-loud neutron star with a period of 75.88 s, challenges conventional models of neutron star radio emission. Here, we showcase results from 46 h of follow-up observations of PSR J0901−4046 using the MeerKAT, Mu…
View article: estado ideal en la obra de Séneca
estado ideal en la obra de Séneca Open
View article: Population dynamics and soil nutrient characteristics of the endangered Annamocarya sinensis in Yunnan, China
Population dynamics and soil nutrient characteristics of the endangered Annamocarya sinensis in Yunnan, China Open
Annamocarya sinensis is an endangered plant species with an extremely small population. This study focuses on the only two known wild populations of A. sinensis in Yunnan Province, China. Conventional population ecology survey methods were…
View article: First Search for Axion Dark Matter with a MADMAX Prototype
First Search for Axion Dark Matter with a MADMAX Prototype Open
This Letter presents the first search for dark matter axions with mass in the ranges 76.56 to 76.82 μeV and 79.31 to 79.53 μeV using a prototype setup for the MAgnetized Disk and Mirror Axion eXperiment (MADMAX). The experimental setup e…
View article: VProChart: Answering Chart Question Through Visual Perception Alignment Agent and Programmatic Solution Reasoning
VProChart: Answering Chart Question Through Visual Perception Alignment Agent and Programmatic Solution Reasoning Open
Charts are widely used for data visualization across various fields, including education, research, and business. Chart Question Answering (CQA) is an emerging task focused on the automatic interpretation and reasoning of data presented in…
View article: Populations of evolved massive binary stars in the Small Magellanic Cloud I: Predictions from detailed evolution models
Populations of evolved massive binary stars in the Small Magellanic Cloud I: Predictions from detailed evolution models Open
Context. The majority of massive stars are born with a close binary companion. How this affects their evolution and fate is still largely uncertain, especially at low metallicity. Aims. We derive synthetic populations of massive post-inter…
View article: Further diagrams of the publication Schürmann, Xu, et al. (Astronomy & Astrophysics)
Further diagrams of the publication Schürmann, Xu, et al. (Astronomy & Astrophysics) Open
Same as Fig. 3, but for initial donor masses of 8, 9, 10, 12, 15, 20, 25, 30, 40, 50, 70 and 99 Msol (see file name). Evolutionary outcome of our binary models at the time when the first SR has formed, or when the system merges, as a funct…
View article: Searches for signatures of ultralight axion dark matter in polarimetry data of the European Pulsar Timing Array
Searches for signatures of ultralight axion dark matter in polarimetry data of the European Pulsar Timing Array Open
Ultralight axionlike particles (ALPs) can be a viable solution to the dark matter problem. The scalar field associated with ALPs, coupled to the electromagnetic field acts as an active birefringent medium, altering the polarization propert…
View article: PENERAPAN TEKNIK THINK PAIR SHARE DALAM PEMBELAJARAN BAHASA INDONESIA UNTUK MENIGKATKAN PARTISIPASI SISWA DAN KEMAMPUAN BERBICARA PADA SISWA KELAS VI DI MIS NURUL HIKMAH PAMEKASAN MADURA
PENERAPAN TEKNIK THINK PAIR SHARE DALAM PEMBELAJARAN BAHASA INDONESIA UNTUK MENIGKATKAN PARTISIPASI SISWA DAN KEMAMPUAN BERBICARA PADA SISWA KELAS VI DI MIS NURUL HIKMAH PAMEKASAN MADURA Open
Indonesian language learning at the elementary/MI level plays a critical role in forming the basis of students' language skills and active participation. This research was conducted to find out the planning process, implementation and impl…
View article: Timing and noise analysis of five millisecond pulsars observed with MeerKAT
Timing and noise analysis of five millisecond pulsars observed with MeerKAT Open
Millisecond pulsars (MSPs) in binary systems are precise laboratories for tests of gravity and the physics of dense matter. Their orbits can show relativistic effects that provide a measurement of the neutron star mass and the pulsars are …
View article: From Kernels to Features: A Multi-Scale Adaptive Theory of Feature Learning
From Kernels to Features: A Multi-Scale Adaptive Theory of Feature Learning Open
Feature learning in neural networks is crucial for their expressive power and inductive biases, motivating various theoretical approaches. Some approaches describe network behavior after training through a change in kernel scale from initi…
View article: Tackling artefacts in the timing of relativistic pulsar binaries: Towards the SKA
Tackling artefacts in the timing of relativistic pulsar binaries: Towards the SKA Open
Common signal-processing approximations produce artefacts when timing pulsars in relativistic binary systems, especially edge-on systems with tight orbits, such as the Double Pulsar. In this paper, we use extensive simulations to explore v…
View article: Tackling artefacts in the timing of relativistic pulsar binaries: towards the SKA
Tackling artefacts in the timing of relativistic pulsar binaries: towards the SKA Open
Common signal-processing approximations produce artefacts when timing pulsars in relativistic binary systems, especially edge-on systems with tight orbits, such as the Double Pulsar. In this paper, we use extensive simulations to explore v…
View article: Discovery of 26 new Galactic radio transients by MeerTRAP
Discovery of 26 new Galactic radio transients by MeerTRAP Open
Radio searches for single pulses provide the opportunity to discover one-off events, fast transients and some pulsars that might otherwise be missed by conventional periodicity searches. The MeerTRAP real-time search pipeline operates comm…
View article: Accelerating Renewable Energy Integration with Machine Learning
Accelerating Renewable Energy Integration with Machine Learning Open
View article: Quantitative analysis and identification of magnesium alloys using fs-LA-SIBS combined with machine learning methods
Quantitative analysis and identification of magnesium alloys using fs-LA-SIBS combined with machine learning methods Open
This work employs the femtosecond laser-ablation spark-induced breakdown spectroscopy (fs-LA-SIBS) technique for the quantitative analysis of magnesium alloy samples.