A5021876108- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Silicon and Solar Cell Technologies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- SAS software applications and methods
- Astronomical Observations and Instrumentation
- Spectroscopy and Chemometric Analyses
- Thin-Film Transistor Technologies
- Astrophysical Phenomena and Observations
- Urban Heat Island Mitigation
- Remote-Sensing Image Classification
- Remote Sensing in Agriculture
- Silicon Nanostructures and Photoluminescence
- Adaptive optics and wavefront sensing
- Photovoltaic System Optimization Techniques
- Impact of Light on Environment and Health
- Remote Sensing and LiDAR Applications
- Wood Treatment and Properties
- solar cell performance optimization
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Spectroscopy Techniques in Biomedical and Chemical Research
- Leaf Properties and Growth Measurement
- Land Use and Ecosystem Services
Norwegian University of Life Sciences
2015-2024
Norwegian Meteorological Institute
2006-2011
Space Telescope Science Institute
2001-2006
Michigan Science Center
2002-2003
University of Liège
1998-2002
Academia Sinica
2000
Institut d'Astrophysique Spatiale
2000
University of Oslo
1998
Traditional plant breeding based on selection for grain yield is time-consuming and costly; therefore, new innovative methods are in high demand to reduce costs accelerate genetic gains. Remote sensing-based platforms such as unmanned aerial vehicles (UAV) show promise predict different traits including yield. Attention currently being devoted machine learning order extract the most meaningful information from massive amounts of data generated by UAV images. These have shown a promising...
We present photometry and spectroscopy of the afterglow GRB 030323. VLT spectra show damped Lyα (DLA) absorption low- high-ionization lines at a redshift . The inferred neutral hydrogen column density, , is larger than any (GRB- or QSO-) DLA density directly from in absorption. From photometry, we derive conservative upper limit to host-galaxy extinction: mag. iron abundance while metallicity gas as measured sulphur an on H2 molecular fraction In trough, emission line detected, which...
Quantitative trait prediction using multispectral UAV imagery is gaining popularity in field trials. However, the reliability of models influenced by type camera and its consistency under different light conditions. In this study, we investigate comparability two popular cameras, Phantom 4 Multispectral (P4M) Micasense RedEdge-M (RedEdge-M), for wheat yield biomass varying sun angles phenological changes. Our results indicate that P4M produces more stable values wavelength bands derived...
We present Ulysses and NEAR data from the detection of short or intermediate duration (2 s) gamma-ray burst GRB 000301C (2000 March 1.41 UT). The (GRB) was localised by Inter Planetary Network (IPN) RXTE to an area ~50 arcmin2. A fading optical counterpart subsequently discovered with Nordic Optical Telescope (NOT) about 42 h after burst. lies at border between long-soft short-hard classes GRBs. If belongs latter class, this would be first afterglow a UBRI photometry time discovery until 11...
We present optical and near-infrared observations of the dim afterglow GRB 020124, obtained between 2 68 hours after gamma-ray burst. The burst occurred in a very faint (R > 29.5) Damped Ly-alpha Absorber (DLA) at redshift z = 3.198 +- 0.004. derived column density neutral hydrogen is log(N_H) 21.7 0.2 rest-frame reddening constrained to be E(B-V) < 0.065, i.e., A_V 0.20 for standard extinction laws with R_V ~ 3. resulting dust-to-gas ratio less than 11 % that found Milky Way, but...
Application of unmanned aerial systems was limited to the military until last decade when we see dramatic growth interest by civilian users. Among many fields application vehicles (UAVs), forestry has diverse uses ranging from forest cover assessment species classification and real-time fire monitoring.Inspired potential technology, this study is a review literature on types UAVs, challenges opportunities, current experiences future prospects using UAVs for resources monitoring in...
Recent advances in robot and sensor technology makes it possible to survey a large number of plants non destructive cost efficient way. The present research approach includes measurements with VIS/NIR multispectral camera mounted on UAV traditional manual ground measurements. analysis presented here, aims (1) evaluate the use imaging from drone as phenotyping tools, (2) compare images see how they can complement each other for an optimized (3) study reflectance response various plant species...
Technological innovations and advanced multidisciplinary research increase the demand for multisensor data fusion in Earth observations. Such has great potential, especially remote sensing field. One sensor is often insufficient analyzing urban environments to obtain comprehensive results. Inspired by capabilities of hyperspectral Light Detection Ranging (LiDAR) at feature level, we present a novel approach multitemporal analysis land cover case study Høvik, Norway. Our generic workflow...
We present optical V and i-band light curves of the gravitationally lensed BAL quasar HE 2149-2745. The data, obtained with 1.5 m Danish Telescope (ESO-La Silla) between October 1998 December 2000, are first from a long-term project aimed at monitoring selected quasars in Southern Hemisphere. A time delay days is determined curves. In addition, VLT/FORS1 spectra 2149-2745 deconvolved order to obtain spectrum faint lensing galaxy, free any contamination by bright nearby two images. By...
Broad-band (ultraviolet to near-infrared) observations of the intense gamma ray burst GRB 990123 started ∼8.5 hours after event and continued until 18 February 1999. When combined with other data, in particular from Robotic Telescope Transient Source Experiment (ROTSE) Hubble Space (HST), evidence emerges for a smoothly declining light curve, suggesting some color dependence that could be related cooling break passing ultraviolet-optical band at about 1 day high-energy event. The steeper...
We present optical R-band light curves of the gravitationally lensed quasar SBS 1520+530 derived from data obtained at Nordic Optical Telescope. A time delay days (1σ) is determined curves. In addition, spectra Keck Observatory are spatially deconvolved in order to extract spectrum faint lensing galaxy, free any contamination by bright images. This indicates a lens redshift , agreement with one absorption systems found spectra. The best mass model system includes second nearby galaxy and...
We present optical I-band light curves of the gravitationally lensed double QSO B1600+434 from observations obtained at Nordic Optical Telescope (NOT) between 1998 April and 1999 November. The photometry has been performed by simultaneous deconvolution all data frames, involving a numerical lens galaxy model. Four methods have applied to determine time delay two components, giving mean estimate Δt = 51 ± 4 days (95% confidence level). This is fourth ever measured. Adopting Ω 0.3, Λ 0...
We present the first results of an observational programme at ESO Very Large Telescope aimed detecting a large sample high-redshift galaxies fainter than current spectroscopic limit R=25.5 for Lyman-Break galaxies. In this paper, we describe deep narrow and broad-band imaging subsequent follow-up multi-object spectroscopy faint in fields BRI1346-0322 Q2138-4427. These QSOs have intervening absorbers, redshifts z=2.85 z=3.15 respectively, which redshifted Ly-alpha emission falls within less...
We present the discovery and monitoring of optical transient (OT) associated with GRB 020410. The fading OT was found by Hubble Space Telescope (HST) observations taken 28 65 days after burst at a position consistent X-ray afterglow. Subsequent re-examination early ground based revealed that faint 6 hours burst, confirming source association A deep non-detection one week requires re-brightened between day 7 28, further late time HST data approximately 100 imply it is very red.We compare both...
We present the discovery of Optical Transient (OT) long-duration gamma-ray burst GRB 000926. The optical transient was detected independently with Nordic Telescope and at Calar Alto 22.2 hours after burst. At this time magnitude . faded a decay slope about 1.7 during first two days which increased abruptly (within few hours) to 2.4. light-curve started flatten off week indicating presence an underlying extended object. This object in deep image obtained one month consists several compact...
We report on photometric, spectroscopic and polarimetric monitoring of the optical near-infrared (NIR) afterglow GRB020405. Ground-based observations, performed with 8 different telescopes, started about 1 day after high-energy prompt event spanned a period ~10 days; addition archival HST data extended coverage up to ~150 days GRB. first detection in NIR bands. The Balmer oxygen emission lines spectrum host galaxy indicates that GRB is located at redshift . Fe ii Mg absorption systems are...
We present optical R-band light curves of the double gravitationally lensed quasar FBQ 0951+2635 from observations obtained at Nordic Optical Telescope between March 1999 and June 2001. A time delay ± 2 days (1σ) is determined curves. New constraints on lensing geometry are provided by position ellipticity galaxy. For a cosmology, yields Hubble parameter (random, ) (systematic) km s-1 Mpc-1 for singular isothermal ellipsoid model constant mass-to-light ratio model. In both models, errors...