A5074866597- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Acoustic Wave Phenomena Research
- Ionosphere and magnetosphere dynamics
- Organometallic Complex Synthesis and Catalysis
- Inertial Sensor and Navigation
- Asymmetric Hydrogenation and Catalysis
- Vibration and Dynamic Analysis
- Vehicle Noise and Vibration Control
- Chemical Synthesis and Analysis
- Advanced Adaptive Filtering Techniques
- Galaxies: Formation, Evolution, Phenomena
- Music Technology and Sound Studies
- Advanced Frequency and Time Standards
- Space Satellite Systems and Control
- Coordination Chemistry and Organometallics
- Drilling and Well Engineering
- Aerodynamics and Acoustics in Jet Flows
- Dark Matter and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Air Traffic Management and Optimization
- Advanced Optical Sensing Technologies
- Ocular and Laser Science Research
International Centre for Radio Astronomy Research
2023
East Sussex County Council
2012-2018
Natural Environment Research Council
2017
Arup Group (United States)
2016
ARUP Laboratories (United States)
2007
University of Southampton
2005-2006
University of Amsterdam
2005
University of Bristol
2005
Abstract The (TOPography EXperiment) TOPEX/Poseidon (T/P) altimetry mission operated for 13 years before the satellite was decommissioned in January 2006, becoming a large space debris object at an altitude of 1,340 km. Since end mission, interaction T/P with environment has driven satellite's spin dynamics. Satellite laser ranging (SLR) measurements collected from June 2014 to October 2016 allow axis orientation be determined accuracy 1.7°. coincides platform yaw (formerly pointing nadir...
The four arsines, As{C6H3(o-CH3)(p-Z)}3{Z=H (2a) or OMe (2b)} and As{C6H3(o-CHMe2)(p-Z)}3{Z=H (2c) (2d)} react with [PdCl2(NCPh)2] [PtCl2(NCBu(t))2] to give trans-[MCl2L2] trans-[M2Cl2(mu-Cl)2L2]. crystal structures of trans-[PdCl2(2a)2] [PtCl2(2d)2] have been determined, the latter as its dichloromethane solvate. show that in these complexes, ligands adopt gga type conformations do all analogous tri-o-tolyl- tri-o-isopropylphenylphosphines square-planar octahedral complexes....
The coordination chemistry of the four phosphines, P{C6H3(o-CH3)(p-Z)}3 where Z = H (1a) or OMe (1b) and P{C6H3(o-CHMe2)(p-Z)}3 (1c) (1d) with platinum(II) palladium(II) is reported. Mononuclear complexes trans-[PdCl2L2](L 1a,b) trans-[PtCl2L2](L 1a-c) have been prepared crystal structures trans-[PdCl2(1b)2] trans-[PtCl2(1c)2] as their dichloromethane solvates determined. show that in these complexes, ligands adopt g+ a conformations. Examination Cambridge Structural Database confirms this...
We use two cosmological simulations to study the impact of spurious heating stellar motions within simulated galaxies by dark matter (DM) particles. The share same numerical and subgrid parameters, but one used a factor 7 more DM Many galaxy properties are unaffected heating, including their masses, star formation histories, spatial distribution gaseous baryons. kinematics particles, however, affected. Below resolution-dependent virial mass, $M_{200}^{\rm spur}$, have higher characteristic...
We are presenting novel active quenching circuit for Single Photon Avalanche Diodes (SPADs). It was designed and optimized satellite laser ranging applications, where the specific requirements put on gating performance. The goal of this work to be able detect photons in short time after gate with constant detection delay sensitivity minimize measurement errors one hand background photon flux induced false count other hand. detector especially must stabilized few nanoseconds activation. In...
This paper details the results of an experiment on a small scale no-flow rig to control spinning mode with similar characteristics modes generated by buzz-saw noise. The (m=−3, n=1) is synthesizer ring which has that low frequency mode. A system using seven microphones and actuators used minimize sum squared pressures at duct wall filtered reference least mean squares (FXLMS) algorithm. It shown certain frequencies sound power transmitted termination reduced 14.5dB. mechanisms different...
The results are presented of a feasibility study into the use active control to reduce low-engine-order components buzz-saw noise produced in an aeroengine. It is shown that effective performance can be achieved using single ring circumferentially spaced actuators and error sensors. Two approaches investigated: minimization sum squared pressures at sensors, weighted spinning mode amplitudes. A comparison made between obtained by these objectives. pressure amplitudes duct walls yields...
This paper discusses some theoretical and experimental issues related to the active control of buzz-saw tones radiated from an aircraft engine inlet at takeoff. Buzz-saw occur when rotor tip speed becomes supersonic. It arises due formation shocks blade tips, which then propagate non-linearly along duct. noise comprises a series harmonically shaft rotation frequency (Engine Orders). Moreover, it has been shown that each Engine Order just one single spinning mode. Whilst there considerable...
This paper presents the results of a feasibility study active control to reduce very low engine order components buzz-saw noise spectrum. It is shown that effective performance can be achieved using single ring actuators minimise sum squared pressures measures at circumferentially spaced error sensors. The shows level evanescent modes excited by factor fundamentally limits when there no or extraneous present variation sound power reduction versus tip speed investigated in detail. that,...
We use a suite of idealised N-body simulations to study the impact spurious heating star particles by dark matter on kinematics and morphology simulated galactic discs. find that collisional leads systematic increase azimuthal velocity dispersion ($σ_ϕ$) stellar corresponding decrease in their mean velocities ($\overline{v}_ϕ$). The rate is dictated primarily number halo (or equivalently, particle mass at fixed mass) radial gradients local density along disc; it largely insensitive mass....
Very little reliable data exist on noise levels and associated crowd atmosphere in stadia. Discussed frequently the media, several stadia are often portrayed as having “best” and/or “noisiest” atmosphere. However, there is no accurate basis or measurement for these claims. This poses challenges when designing new stadiums with intent to improve spectator experience. Architectural elements such overhangs vertical sound reflecting surfaces well known redirect acoustic energy overall level....