A5103136688- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Advanced Radiotherapy Techniques
- Adhesion, Friction, and Surface Interactions
- Mechanical and Optical Resonators
- Astronomical Observations and Instrumentation
- Superconducting and THz Device Technology
- Force Microscopy Techniques and Applications
- Radiomics and Machine Learning in Medical Imaging
- Astrophysics and Star Formation Studies
- Medical Imaging Techniques and Applications
- Adaptive optics and wavefront sensing
- Surface Roughness and Optical Measurements
- Ocular Diseases and Behçet’s Syndrome
- MRI in cancer diagnosis
- Nanowire Synthesis and Applications
- Optical Systems and Laser Technology
- Muscle Physiology and Disorders
- Metal and Thin Film Mechanics
- Effects of Radiation Exposure
- Advanced MEMS and NEMS Technologies
- Copper Interconnects and Reliability
Durham University
2024-2025
Leiden University
1989-2024
The University of Texas Southwestern Medical Center
2007-2014
Southwestern Medical Center
2014
Radiation Oncology Associates
2007-2010
University of Groningen
2005-2007
De Kinderkliniek
1997
Marquette University
1989
In this data release from the LOFAR Two-metre Sky Survey (LoTSS) we present 120-168MHz images covering 27% of northern sky. Our coverage is split into two regions centred at approximately 12h45m +44$^\circ$30' and 1h00m +28$^\circ$00' spanning 4178 1457 square degrees respectively. The were derived 3,451hrs (7.6PB) High Band Antenna which corrected for direction-independent instrumental properties as well direction-dependent ionospheric distortions during extensive, but fully automated,...
In this predominantly photometric study, we investigate various types of and physical instabilities in the yellow hypergiant (YHG) ρ Cas as well its evolution between 1885 2023. The second study is YHG HR 8752, which recently became stable. other two hypergiants are 5171A HD 179821. We constructed temperature calibration relations based on T eff simultaneously observed B V photometry, exclusively for enabled us to discuss dependencies selective continuum opacity variations . An important...
The International LOFAR Telescope (ILT) is a pan-European radio interferometer with baselines up to 2,000 km. This provides sub-arcsecond resolution at frequencies of <200 MHz. Since starting science operations in 2012, the ILT has carried out observations for state-of-the-art Two-metre Sky Survey, which 6 arcsec 144 Wide-area surveys low frequencies, while scientifically productive, have compromise on resolution. Sub-arcsecond imaging become more accessible over last decade, thanks efforts...
The purpose of this investigation was to determine how models weightlessness, hindlimb suspension (HS), and immobilization (HI) affect the metabolic enzyme profile in slow oxidative (SO), fast glycolytic (FOG), (FG) fibers rat hindlimb. After 1, 2, or 4 wk HS HI, single were isolated from freeze-dried soleus gastrocnemius muscles; a small section each fiber run on sodium dodecyl sulfate-polyacrylamide gel electrophoresis gels identify type, remaining piece assayed for either lactate...
Fatigue failure in micron-scale polycrystalline silicon structural films, a phenomenon that is not observed bulk silicon, can severely impact the durability and reliability of microelectromechanical system devices. Despite several studies on very high-cycle fatigue behavior these films (up to 1012cycles), there still an on-going debate precise mechanisms involved. We show here for devices fabricated multiuser process (MUMPs) foundry Sandia Ultra-planar, Multi-level MEMS Technology (SUMMiT...
Radio mini-haloes are poorly-understood, moderately-extended diffuse radio sources that trace the presence of magnetic fields and relativistic electrons on scales hundreds kiloparsecs, predominantly in relaxed clusters. With relatively few confirmed detections to-date, many questions remain unanswered. This paper presents new observations galaxy cluster MS1455.0$+$2232 performed with MeerKAT (covering frequency range 872$-$1712 MHz) LOFAR 120$-$168 MHz), first results from a homogeneously...
In this paper we report the first identification of jellyfish galaxies in Perseus cluster (Abell 426). We identified four (LEDA 2191078, MCG +07-07-070, UGC 2654, 2665) within central $2^\circ \times 2^\circ$ ($2.6\,\mathrm{Mpc} 2.6\,\mathrm{Mpc}$) based on presence one-sided radio continuum tails that were detected at $144\,\mathrm{MHz}$ by LOw Frequency ARray (LOFAR). The observed tails, as well orientation morphological features rest-frame optical, are consistent with these being impacted...
ABSTRACT Many relaxed cool-core clusters host diffuse radio emission on scales of hundreds kiloparsecs: mini-haloes. However, the mechanism responsible for generating them, as well their connection with central active galactic nuclei, is elusive and many questions related to physical properties origins remain unanswered. This paper presents new observations galaxy cluster Abell 1413 performed MeerKAT (L-band; 872 1712 MHz) LOFAR HBA (120 168 part a statistical homogeneous census unique among...
Measurements of the quantity radio-mode feedback injected by an active galactic nucleus into cluster environment have mostly relied on X-ray observations, which reveal cavities in intracluster medium excavated radio lobes. However, sensitivity required to accurately constrain dimensions these has proven be a major limiting factor and is main bottleneck high-redshift measurements. We describe hybrid method based combination aims enhance our ability study feedback. In this paper, we present...
We present the detection of 68 sources from most sensitive radio survey in circular polarisation conducted to date. use second data release 144 MHz LOFAR Two-metre Sky Survey produce circularly-polarised maps with median 140 $\mu$Jy beam$^{-1}$ noise and resolution 20$''$ for $\approx$27% northern sky (5634 deg$^{2}$). The leakage total intensity into is measured be $\approx$0.06%, our complete at flux densities $\geq1$ mJy. A considered reliable when fraction exceeds 1%. find population...
The prominent radio source Hercules A features complex structures in its lobes. Although it is one of the most comprehensively studied sources sky, origin ring lobes remains an open question. We present first sub-arcsecond angular resolution images at low frequencies (<300 MHz) A, made with International LOFAR Telescope. With addition data from Karl G. Jansky Very Large Array, we mapped structure 144 MHz to 7 GHz. explore rings within and test whether their properties are best described by a...
<title>Abstract</title> Jets launched by supermassive black holes transport relativistic leptons, magnetic fields, and atomic nuclei from the centres of galaxies to their outskirts beyond. These outflows embody most energetic pathway which respond Cosmic Web environment. Studying hole feedback is an astrophysical frontier, providing insights on star formation, galaxy cluster stability, origin cosmic rays, magnetism, heavy elements throughout Universe. This feedback’s cosmological importance...
The Perseus cluster is the brightest X-ray in sky and known as a cool-core galaxy cluster. Being very nearby cluster, it has been extensively studied. This provided comprehensive view of physical processes that operate intracluster medium (ICM), including feedback from active galactic nucleus (AGN) 3C\,84 measurements ICM turbulence. Additionally, contains central radio mini-halo. diffuse source traces cosmic-ray electrons (re-)accelerated situ ICM. Here, we report on LOFAR high-band antenna...
The Perseus cluster is the brightest X-ray in sky and known as a cool-core galaxy cluster. Being very nearby cluster, it has been extensively studied. This provided comprehensive view of physical processes that operate intracluster medium (ICM), including feedback from AGN 3C84 measurements ICM turbulence. Additionally, contains central radio mini-halo. diffuse source traces cosmic ray electrons (re-)accelerated in-situ ICM. Here we report on LOFAR high-band antenna 120-168 MHz observations...
It is generally known that luminous, ultra-steep spectrum radio sources are preferentially associated with massive galaxies at high redshifts. In this paper, we describe a pilot project directed such objects to demonstrate the feasibility and importance of using LOw-Frequency ARray (LOFAR) data study most distant undergoing formation protoclusters. We successfully imaged four high-redshift ( z > 2), high-luminosity sub-arcsecond resolution, 144 MHz, International LOFAR Telescope (ILT)....
This paper concentrates on microscopic observations of the propagation cracks along polymer-glass interfaces and crack mechanisms. The experimental set-up consists an asymmetric double cantilever beam in optical microscope. Image processing techniques used to isolate fronts are presented. propagate inhomogeneously space time, i.e., bursts that spread laterally front over a certain distance. It is interesting note two different cases detected; one which dominated by initiation instabilities...
Aim: To compare the efficacy of ranitidine bismuth citrate plus clarithromycin (RBC–C) vs. omeprazole amoxycillin (OME–AMO) in cure Helicobacter pylori infection. Methods: In this double‐blind, multicentre, parallel‐group study 122 H. ‐positive patients with active duodenal ulcer or gastritis, confirmed history ulcer, were randomized to treatment 400 mg b.d. 500 20 1000 for 14 days, followed by days once daily, respectively, facilitate healing. Endoscopy was carried out at start and 28 after...
Radio-mode feedback associated with the active galactic nuclei (AGN) at cores of galaxy clusters injects large amount energy into intracluster medium (ICM), offsetting radiative losses through X-ray emission. This mechanism prevents ICM from rapidly cooling down and fueling extreme starburst activity as it accretes onto central galaxies, is therefore a key ingredient in evolution clusters. However, influence mode high redshifts (z~1) remains largely unknown. Low-frequency sub-arcsecond...
Radio-mode feedback associated with the active galactic nuclei (AGNs) at cores of galaxy clusters injects a large amount energy into intracluster medium (ICM), offsetting radiative losses through X-ray emission. This mechanism prevents ICM from rapidly cooling down and fueling extreme starburst activity as it accretes onto central galaxies, is therefore key ingredient in evolution clusters. However, influence mode high redshifts ( z ∼ 1) remains largely unknown. Low-frequency...