A5089786624- Stellar, planetary, and galactic studies
- Heat transfer and supercritical fluids
- Nuclear reactor physics and engineering
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Heat Transfer and Optimization
- Astro and Planetary Science
- Iron and Steelmaking Processes
- Radiative Heat Transfer Studies
- Advanced Power Generation Technologies
- Gamma-ray bursts and supernovae
- Granular flow and fluidized beds
- Rocket and propulsion systems research
- Metallurgical Processes and Thermodynamics
- Adaptive optics and wavefront sensing
- Geothermal Energy Systems and Applications
- Heat Transfer and Boiling Studies
- Heat Transfer Mechanisms
- Heat and Mass Transfer in Porous Media
- Solar Thermal and Photovoltaic Systems
- Robotic Path Planning Algorithms
- Dynamics and Control of Mechanical Systems
- Coal Combustion and Slurry Processing
- CCD and CMOS Imaging Sensors
- Induction Heating and Inverter Technology
University of St Andrews
2020-2024
Forest Research
2024
Central Electricity Generating Board
1963-2019
University College London
2019
Building Research Establishment
1967
This paper reports a technique for the study of pneumatically-conveyed solids. Two equations have been established experimentally which give pressure gradient and solid velocity along pipe when non-adhesive spherical particles (up to 7 mm in diameter) are being conveyed with little or no acceleration by an airstream through pipe. Straight, smooth horizontal pipes cm considered. Included is section examining practical application equations, successful check made some values variables outside...
This paper describes the development of a meter, employing radial disk principle, for measurements local heat flux to water-steam tube surfaces boiler furnaces. The design and material requirements are stated meter operate successfully in arduous conditions combustion chamber.
The existence of kilometer size objects in the Oort cloud has been conjectured but not observed as these are too small and far away to be detected by reflected sunlight with current telescopes. However, could serendipitous occultations stars. We outline a pilot study for planned occultation survey that will mount high frame-rate sCMOS cameras otherwise unused areas focal planes large, ground-based Because gigabytes imaging data produced every second, making storage impractical long-term...
We present the results of 14 nights \textit{I}-band photometric monitoring nearby brown dwarf binary, $\epsilon$ Indi Ba,Bb. Observations were acquired over 2 months, and total close to 42 hours coverage at a typically high cadence 1.4 minutes. At separation just $0.7''$, we do not resolve individual components, so effectively treat binary as if it single object. However, Ba (spectral type T1) is brightest known T-type dwarf, expected dominate signal. find no strong variability associated...
Mass transfer analogue techniques can provide a quick and inexpensive method of determining convective heat coefficients. One involves coating the surfaces under investigation with thin layer naphthalene observing rate sublimation into an airstream passing over surfaces. The success this is dependent upon being suitable quality uniform thickness. A spraying technique for applying has been developed achieved consistently reliable results both external internal
Context. Brown dwarfs are poorly understood transition objects between stars and planets, with several competing mechanisms having been proposed for their formation. Mass measurements generally difficult isolated but also brown orbiting low-mass stars, which often too faint spectroscopic follow-up. Aims. Microlensing provides an alternative tool the discovery investigation of such systems. Here we present analysis microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035, is due to a binary...
ABSTRACT HATS-18 b is a transiting planet with large mass and short orbital period, one of the best candidates for detection decay induced by tidal effects. We present extensive photometry from which we measure 27 times mid-transit. Two further transit were measured data Transiting Exoplanet Survey Satellite (TESS) three more taken literature. The timings fitted linear quadratic ephemerides an upper limit on was determined. This corresponds to lower modified stellar quality factor $Q_\star...
Abstract We present an analysis of microlensing event OGLE-2019-BLG-0825. This was identified as a planetary candidate by preliminary modeling. find that significant residuals from the best-fit static binary-lens model exist and xallarap effect can fit very well significantly improves χ 2 values. On other hand, including in our models, we parameters such mass ratio, q , separation, s cannot be constrained well. However, also for source system orbital period semimajor axis are consistent...
ABSTRACT We present a GPU-accelerated numerical approach for fast kernel and differential background solutions. The model image proposed in the Bramich Difference Image Analysis (DIA) algorithm is analogous to very simple convolutional neural network (CNN), with single filter (i.e. kernel) an added scalar bias background). Here, we do not solve discrete pixel array classical, analytical linear least-squares sense. Instead, by making use of PyTorch tensors (GPU compatible multidimensional...
In traditional lucky imaging (TLI), many consecutive images of the same scene are taken with a high frame-rate camera, and all but sharpest discarded before constructing final shift-and-add image. Here we present an alternative image analysis pipeline -- The Thresher for these kinds data, based on online multi-frame blind deconvolution. It makes use available data to obtain best estimate astronomical in context reasonable computational limits; it does not require prior estimates point-spread...
The paper describes a study of the effect variations in physical properties gas caused by large gas-to-wall temperature differences on convective heat transfer to plain tubes cross-flow. experiments were carried out air at bulk air-to-wall ranging from 109 K 397 with two levels tube-wall temperature, 40°C or 120°C. Reynolds number ranged 10 4 2.65 times . It was found that variation could be accommodated evaluating all these dimensionless groups conventional type correlation temperature.
We present an analysis of the results long-term, multi-band photometric monitoring enigmatic star, KIC 8462852. Observations in B, g', V, r', and IC passbands have been acquired at University College London Observatory between 2017 May 2018 September. interrogate wavelength dependence ∼month-long dimming brightening exhibited by target star over 85 day interval, immediately following a days-long ∼5% drop brightness on Julian Date (JD) 2,458,203. Between JD 2,458,215–300 we measure variations...
Some modifications have been carried out to the NPL designed standard thermometer calibration baths improve ease of their operation. Predetermined temperatures can be reached readily by incorporating a proportional temperature controller. To obtain required rapid response characteristics, heaters are now immersed directly in working fluid and thermal capacity system has considerably reduced. Adequate stability uniformity achieved.
The area of path planning has received a great deal attention recently. Algorithms are required that can deliver optimal paths for robots to take over homogeneous or non-homogeneous terrain. Optimal may be those involve the shortest distance travelled, least number turns ascents and descents. often highly complex nature terrains necessity realtime solutions have lead requirement development parallel algorithms. Such problems been notoriously difficult parallelise efficiently; indeed it said...
We present an analysis of microlensing event OGLE-2019-BLG-0825. This was identified as a planetary candidate by preliminary modeling. find that significant residuals from the best-fit static binary-lens model exist and xallarap effect can fit very well significantly improves $\chi^2$ values. On other hand, including in our models, we parameters like mass-ratio, $q$, separation, $s$, cannot be constrained well. However, also for source system orbital period semi major axis are consistent...
This paper describes the development of a device for measurement local heat-transfer coefficient. Such was required to measure coefficients between heated air and solid surface complex geometric shape, under steady-state conditions. The meter described is based on method suggested by Gardon (1)† where heat flux into thin constantan disc, arranged flush with fluid-solid interface, produces radial temperature gradient in disc. Provision suitable copper connections at centre periphery disc...
Distributed parameter transfer functions, derived from heat-balance partial-differential equations for a simple tubular element, are applied to cases of real superheaters having complicated geometry and simultaneous variation more than one input perturbation. The results such computations compared with observations recently made on large C.E.G.B. installations. A digital computer programme has been prepared which the dynamic characteristics any new superheater design may be rapidly...
This paper describes the development of a meter, employing radial disc principle, for measurements local heat flux to water/steam tube surfaces boiler furnaces. The design and material requirements are stated meter operate successfully in arduous conditions combustion chamber. is followed from initial prototype proving final design.