A5081170709- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Gamma-ray bursts and supernovae
- Quantum chaos and dynamical systems
- Theoretical and Computational Physics
- Earthquake Detection and Analysis
- Quantum, superfluid, helium dynamics
- Astro and Planetary Science
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Relativity and Gravitational Theory
- Cold Atom Physics and Bose-Einstein Condensates
- Complex Systems and Time Series Analysis
- Geomagnetism and Paleomagnetism Studies
- Graphene research and applications
- Advanced Thermodynamics and Statistical Mechanics
- Quantum Mechanics and Applications
- Astrophysics and Cosmic Phenomena
- Geophysics and Sensor Technology
- Mathematical Dynamics and Fractals
- MXene and MAX Phase Materials
- Chaos control and synchronization
- Scientific Research and Discoveries
- Conducting polymers and applications
- Statistical Mechanics and Entropy
Trinity College Dublin
2012-2023
Trinity College
2023
European Synchrotron Radiation Facility
2005
Jožef Stefan International Postgraduate School
2005
Jožef Stefan Institute
2005
University of Catania
2005
University of Oslo
2000
University of Houston
1977-1997
Institute for Energy Technology
1989-1993
Mineral Resources
1983
Monitoring of human bodily motion requires wearable sensors that can detect position, velocity and acceleration. They should be cheap, lightweight, mechanically compliant display reasonable sensitivity at high strains strain rates. No reported material has simultaneously demonstrated all the above requirements. Here we describe a simple method to infuse liquid-exfoliated graphene into natural rubber create conducting composites. These materials are excellent displaying 104-fold increases in...
In order to fulfill their potential for applications, it will be necessary develop large-scale production methods two-dimensional (2D) inorganic nanosheets. Here we demonstrate the shear-exfoliation of molybdenum disulfide nanosheets in aqueous surfactant solution using a kitchen blender. Using standard procedures, measure how MoS2 concentration and rate scale with processing parameters. However, also use recently developed based on optical spectroscopy simultaneously both nanosheet lateral...
To facilitate progression from the lab to commercial applications, it will be necessary develop simple, scalable methods produce high quality graphene. Here we demonstrate production of large quantities defect-free graphene using a kitchen blender and household detergent. We have characterised scaling both concentration rate with mixing parameters: time, initial graphite concentration, rotor speed liquid volume. find invariant time increase strongly volume, results which are important for...
Due to their ease of fabrication and monodisperse, metallic nature, molybdenum-sulfur-iodine nanowires are an interesting alternative carbon nanotubes for some applications. However very little is known about the solubility these materials. In this work we have investigated Mo(6)S(4.5)I(4.5) nanowire soot in a range common solvents by performing sedimentation studies microscopic spectroscopic characterization. A equation was derived showing that concentration any insoluble dispersed phase...
Abstract Geomagnetically induced currents (GICs) are a well‐known terrestrial space weather hazard. They occur in power transmission networks and known to have adverse effects both high‐latitude midlatitude countries. Here we study GICs the Irish network (geomagnetic latitude 54.7–58.5°N) during five geomagnetic storms (6–7 March 2016, 20–21 December 2015, 17–18 29–31 October 2003, 13–14 1989). We simulate electric fields using plane wave method together with two ground resistivity models,...
Abstract Electrospinning has been used to produce porous, low density, polymer–nanotube composite membranes. The membrane mechanical properties can be enhanced by tuning the nanotube content, aligning fibers during spinning, and post production drawing. are maximized for membranes with a content of 0.43 vol %. Aligned composites at this volume fraction have prepared spinning onto rotating drum collector electrode. This method results in significant increases modulus, strength, toughness....
The Sun regularly produces large-scale eruptive events, such as coronal mass ejections (CMEs) that can drive shock waves through the solar corona. Such shocks result in electron acceleration and subsequent radio emission form of a type II burst. However, early-phase evolution properties its relationship to burst is still subject investigation. Here we study CME-driven by comparing three commonly used methods calculating Alfv\'en Mach number ($M_A$), namely: geometry, comparison CME speed...
For pt.I, see ibid., vol.8, p.203 (1975). The theory of capture and release an electron bubble from a quantized vortex line in rotating He II has been presented part I, along with derivation the kinetic coefficients for to lowest order external field strength. This information is used analyse available experimental data on release, show that dependence both cross section lifetime accurately predicted by Brownian motion ion presence static potential, as well temperature T>or approximately=1.4K.
In the Celtic Tiger years, Ireland underwent an explosive growth in housing and increase light pollution, nationally. We outline work undertaken towards first ever ground-based survey of pollution island illustrate this with some representative data taken between 2009 present. The aim our is to establish a database serve as reference monitor future changes, compare in-orbit measurements, study potential impact on environment permit calculation effects changes lighting usage patterns. also...
Abstract Solar flare emission at X‐ray and extreme ultraviolet (EUV) energies can cause substantial enhancements in the electron density Earth's lower ionosphere. It has now become clear that flares exhibit quasi‐periodic pulsations with timescales of minutes energies, but to date, it not been known if ionosphere is sensitive this variability. Here using a combination very low frequency (24 kHz) measurement together space‐based EUV observations, we report ionospheric D region, which are...
Abstract. In this paper we analysed sudden phase anomalies (SPAs) of VLF–LF signals recorded at Graz (Austria), Birr (Ireland) and Moscow (Russia) stations during two strong solar flares in September 2017. The first X-class 9.3 flare occurred on 6 12:02 UT, the second 8.2 was observed 10 2017 16:06 UT. Data from seven transmitters a frequency range between 20 45 kHz are used for analysis. SPAs were all middle-latitude paths (differently orientated) with path lengths 350 to 7000 km. Solar...
Abstract An experimental study of the phase and amplitude observations sub‐ionospheric very low frequency (VLF/LF) signals is performed to analyze response lower ionosphere during 21 August 2017 total solar eclipse in United States America. Three different wave paths are investigated. The length varies from 2,200 6,400 km, signal frequencies 21.4, 25.2, 40.75 kHz. two cross region eclipse, third path 40–60% obscuration. None reveal any noticeable changes while negative anomalies (from −33°...
ABSTRACT Rotating radio transients (RRATs) are neutron stars that emit detectable bursts sporadically. They statistically distinct in the star population, many observable properties, but by their nature practically difficult to study depth. In this paper, we present results from 1408 h of observations RRAT candidates using Irish station Low Frequency Array (LOFAR) at 150 MHz. As October 2022, census involved observing 113 sources, leading 29 detections which were then followed up...
The discovery of the ubiquity habitable extrasolar planets, combined with revolutionary advances in instrumentation and observational capabilities, have ushered a renaissance millenia-old quest to answer our most profound question about Universe place within it - Are we alone? Breakthrough Listen Initiative, announced July 2015 as 10-year 100M USD program, is comprehensive effort history quantify distribution advanced, technologically capable life universe. In this white paper, outline...
In this review, we apply the method of backward iteration to chaotic maps interval illustrate how both f(α) spectrum and its underlying statistical mechanics follow directly from dynamics in equilibrium. The sizes intervals coarse-grained phase space are expressed terms finite-time average Liapunov exponents, representing reverse information flow that is cause deterministic chaos. transfer matrix formulation follows when addresses generated symbolic assigned tree-branches. inverse...
The Search for Extraterrestrial Intelligence aims to find evidence of technosignatures, which can point toward the possible existence technologically advanced extraterrestrial life. Radio signals similar those engineered on Earth may be transmitted by other civilizations, motivating technosignature searches across entire radio spectrum. In this endeavor, low-frequency band has remained largely unexplored; with prior primarily above 1 GHz. survey at 110-190 MHz, observations 1,631,198 targets...
Modern radio interferometers such as the LOw Frequency ARray (LOFAR) are capable of producing data at hundreds gigabits to terabits per second. This high rate makes analysis cumbersome and computationally expensive. While performance computing facilities exist for large national international facilities, that may not be case instruments operated by a single institution or small consortium. Data rates next generation telescopes set eclipse those currently in operation, hence local processing...
ABSTRACT The Low Frequency Array (LOFAR) is an international radio telescope array, consisting of 38 stations in the Netherlands and 14 spread over Europe. Here, we present observation method to study Jovian decametric emissions from several LOFAR (here Birr Castle Ireland, Nançay France, Postdam Germany), at high temporal spectral resolution. This based on prediction tools, such as emission simulations probability maps, data processing. We report Io-induced 2021 June, a first case...