ORCID Profile
0000-0002-0297-105X
Current Organisations
Badan Riset dan Inovasi Nasional Republik Indonesia
,
National Research and Innovation Agency
,
York University
,
Hartebeestheok Radio Astronomy Observatory
,
Centro de Estudos da Metrópole (CEM, Cepid, FAPESP), Universidade de São Paulo e Centro Brasileiro de Análise e Planejamento
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Publications
Rice grain quality evaluation in some promising lines of swamp and upland rice
Publisher: IOP Publishing
Date: 07-2021
DOI: 10.1088/1755-1315/807/3/032031
Abstract: The research aimed to determine the rice grain quality of some promising lines from the advanced breeding generation of sw rice and upland rice. The research material was 43 rice grain s les from the multilocation test sites of sw rice (16 rice lines, 3 check varieties) and upland rice (20 rice lines, 4 check varieties) harvested in 2018. All rough rice s les were analyzed for the rough rice physical quality, milled rice physical quality, milling quality, physicochemical quality, and organoleptic quality (scoring test and hedonic test). The results showed that in general, the promising lines of sw rice had higher values of unpolished rice yield, polished rice yield, head rice percentage, and protein content than those of upland rice. In addition, the promising lines of sw rice had lower empty rough rice and immature+chalky grain than those of upland rice lines. Among the promising lines of sw rice, B13926E-KA-43, B13931E-KA-33, and BP30400F-KA-5 had the highest head rice percentage, unpolished rice yield, and polished rice yield, whereas, among the promising lines of upland rice, B15392D-KR-12, B15511D-KR-20, and B15514D-KR-5 had the highest head rice percentage, unpolished rice yield, and polished rice yield.
Simultaneous Selection of Rice Genotypes Tolerant to Anaerobic Germination
Publisher: IOP Publishing
Date: 04-2022
DOI: 10.1088/1755-1315/1012/1/012029
Abstract: Farmers mainly cultivate direct seeding in rainfed and sw y areas, which flood stress occurs. This stress causes the ability of coleoptile seeds to grow are inhibited, and only the genotype that is tolerant to anaerobic stress conditions in the germination phase (anaerobic germination-AG) can grow well. The study aimed to select rice genotypes based on yield, AG tolerance, and resistance to pests and diseases. The material used was 25 rice genotypes of rainfed lowland. The research consisted of yield trials, screening of main pests and diseases, and screening anaerobic germination stress. All trials were conducted in 2017. The results showed ten genotypes with yields above 6.5 t ha -1 , not significantly different to the best check Inpari 39. Nine genotypes were resistant to brown planthoppers, 19 genotypes were resistant to bacterial leaf blight, and some genotypes were resistant to some races of blast. Screening of AG stress showed that four genotypes had growth percentage and shoot elongation not significantly different to AG tolerant check. Based on the simultaneous selection, it was selected 11 genotypes to continue to evaluate in the multilocation yield trial, which were BP20106C-SKI-3-1-0, IR83142-B-49-B-IND, IR 83381-B-B-6-1, IR 83376-B-B-130-3, IR 129336:11-19-Ski-0-Kn-3, IR 129336:11-8-Ski-0-Kn-8, IR 129336:11-8-Ski-0-Kn-11, B14316E-KA-15, and B14864E-SKI-7-6-2.
Radio afterglows of very high-energy gamma-ray bursts 190829A and 180720B
Publisher: Oxford University Press (OUP)
Date: 17-06-2020
Abstract: We present high-cadence multifrequency radio observations of the long gamma-ray burst (GRB) 190829A, which was detected at photon energies above 100 GeV by the High Energy Stereoscopic System (H.E.S.S.). Observations with the Meer Karoo Array Telescope (MeerKAT, 1.3 GHz) and Arcminute Microkelvin Imager – Large Array (AMI-LA, 15.5 GHz) began one day post-burst and lasted nearly 200 d. We used complementary data from Swift X-Ray Telescope (XRT), which ran to 100 d post-burst. We detected a likely forward shock component with both MeerKAT and XRT up to over 100 d post-burst. Conversely, the AMI-LA light curve appears to be dominated by reverse shock emission until around 70 d post-burst when the afterglow flux drops below the level of the host galaxy. We also present previously unpublished observations of the other H.E.S.S.-detected GRB, GRB 180720B from AMI-LA, which shows likely forward shock emission that fades in less than 10 d. We present a comparison between the radio emission from the three GRBs with detected very high energy (VHE) gamma-ray emission and a sensitivity-limited radio afterglow s le. GRB 190829A has the lowest isotropic radio luminosity of any GRB in our s le, but the distribution of luminosities is otherwise consistent, as expected, with the VHE GRBs being drawn from the same parent distribution as the other radio-detected long GRBs.
A radio-emitting outflow produced by the tidal disruption event AT2020vwl
Publisher: Oxford University Press (OUP)
Date: 27-04-2023
Abstract: A tidal disruption event (TDE) occurs when a star is destroyed by a supermassive black hole. Broad-band radio spectral observations of TDEs trace the emission from any outflows or jets that are ejected from the vicinity of the supermassive black hole. However, radio detections of TDEs are rare, with & published to date, and only 11 with multi-epoch broad-band coverage. Here we present the radio detection of the TDE AT2020vwl and our subsequent radio monitoring c aign of the outflow that was produced, spanning 1.5 yr post-optical flare. We tracked the outflow evolution as it expanded between 1016 and 1017 cm from the supermassive black hole, deducing it was non-relativistic and launched quasi-simultaneously with the initial optical detection through modelling the evolving synchrotron spectra of the event. We deduce that the outflow is likely to have been launched by material ejected from stream-stream collisions (more likely), the unbound debris stream, or an accretion-induced wind or jet from the supermassive black hole (less likely). AT2020vwl joins a growing number of TDEs with well-characterized prompt radio emission, with future timely radio observations of TDEs required to fully understand the mechanism that produces this type of radio emission in TDEs.
Late-time Evolution and Modeling of the Off-axis Gamma-Ray Burst Candidate FIRST J141918.9+394036
Publisher: American Astronomical Society
Date: 2022
Abstract: We present new radio and optical data, including very-long-baseline interferometry, as well as archival data analysis, for the luminous, decades-long radio transient FIRST J141918.9+394036. The radio data reveal a synchrotron self-absorption peak around 0.3 GHz and a radius of around 1.3 mas (0.5 pc) 26 yr post-discovery, indicating a blastwave energy ∼5 × 10 50 erg. The optical spectrum shows a broad [O iii ] λ 4959,5007 emission line that may indicate collisional excitation in the host galaxy, but its association with the transient cannot be ruled out. The properties of the host galaxy are suggestive of a massive stellar progenitor that formed at low metallicity. Based on the radio light curve, blastwave velocity, energetics, nature of the host galaxy and transient rates, we find that the properties of J1419+3940 are most consistent with long gamma-ray burst (LGRB) afterglows. Other classes of (optically discovered) stellar explosions as well as neutron star mergers are disfavored, and invoking any exotic scenario may not be necessary. It is therefore likely that J1419+3940 is an off-axis LGRB afterglow (as suggested by Law et al. and Marcote et al.), and under this premise the inverse beaming fraction is found to be f b − 1 ≃ 280 − 200 + 700 , corresponding to an average jet half-opening angle θ j ≃ 5 − 2 + 4 degrees (68% confidence), consistent with previous estimates. From the volumetric rate we predict that surveys with the Very Large Array, Australian Square Kilometre Array Pathfinder, and MeerKAT will find a handful of J1419+3940-like events over the coming years.
The Radio Luminosity-risetime Function of Core-collapse Supernovae
Publisher: American Astronomical Society
Date: 02-2021
Abstract: We assemble a large set of 2–10 GHz radio flux density measurements and upper limits of 294 different supernovae (SNe), from the literature and our own and archival data. Only 31% of SNe were detected. We characterize the SN radio lightcurves near the peak using a two-parameter model, with t pk being the time to rise to a peak and L pk the spectral luminosity at that peak. Over all SNe in our s le at D 100 Mpc, we find that t pk = 10 1.7±0.9 days and that L pk = 10 25.5±1.6 erg s −1 Hz −1 , and therefore that generally 50% of SNe will have L pk 10 25.5 erg s −1 Hz −1 . These L pk values are ∼30 times lower than those for only detected SNe. Types Ib/c and II (excluding IIn’s) have similar mean values of L pk but the former have a wider range, whereas Type IIn SNe have ∼10 times higher values with L pk = 10 26.5±1.1 erg s −1 Hz −1 . As for t pk , Type Ib/c have t pk of only 10 1.1±0.5 days while Type II have t pk = 10 1.6±1.0 and Type IIn the longest timescales with t pk = 10 3.1±0.7 days. We also estimate the distribution of progenitor mass-loss rates, , and find that the mean and standard deviation of are −5.4 ± 1.2 (assuming v wind = 1000 km s −1 ) for Type Ib/c SNe, and −6.9 ± 1.4 (assuming v wind = 10 km s −1 ) for Type II SNe excluding Type IIn.
Development of tolerant rice varieties for stress-prone ecosystems in the coastal deltas of Indonesia
Publisher: Elsevier BV
Date: 06-2018
Children's active transport and independent mobility in the urban environment
Publisher: Routledge
Date: 06-07-2017
Related Organisations
Badan Riset Dan Inovasi Nasional Republik Indonesia
Location: Indonesia
Consejo Nacional De Investigaciones Científicas Y Técnicas
Location: Argentina
Centro De Estudos Da Metrópole (CEM, Cepid, FAPESP), Universidade De São Paulo E Centro Brasileiro De Análise E Planejamento
Location: Brazil
Universidad De Buenos Aires Facultad De Filosofia Y Letras
Location: Argentina
Related Funding Activities
No related grants have been discovered for Eugenia Brage.