All Outputs (22)

Common-red-signal analysis with 24-yr high-precision timing of the European Pulsar Timing Array: inferences in the stochastic gravitational-wave background search (2021)
Journal Article
Chen, S., Caballero, R. N., Guo, Y. J., Chalumeau, A., Liu, K., Shaifullah, G., Lee, K. J., Babak, S., Desvignes, G., Parthasarathy, A., Hu, H., Van Der Wateren, E., Antoniadis, J., Bak Nielsen, A. S., Bassa, C. G., Berthereau, A., Burgay, M., Champion, D. J., Cognard, I., Falxa, M., …Xu, H. (2021). Common-red-signal analysis with 24-yr high-precision timing of the European Pulsar Timing Array: inferences in the stochastic gravitational-wave background search. Monthly notices of the Royal Astronomical Society, 508(4), 4970-4993. https://doi.org/10.1093/mnras/stab2833

We present results from the search for a stochastic gravitational-wave background (GWB) as predicted by the theory of General Relativity using six radio millisecond pulsars from the Data Release 2 (DR2) of the European Pulsar Timing Array (EPTA) cove... Read More about Common-red-signal analysis with 24-yr high-precision timing of the European Pulsar Timing Array: inferences in the stochastic gravitational-wave background search.

Removal and replacement of interference in tied-array radio pulsar observations using the spectral kurtosis estimator (2021)
Journal Article
Purver, M., Bassa, C. G., Cognard, I., Janssen, G. H., Karuppusamy, R., Kramer, M., Lee, K. J., Liu, K., McKee, J. W., Perrodin, D., Sanidas, S., Smits, R., & Stappers, B. W. (2022). Removal and replacement of interference in tied-array radio pulsar observations using the spectral kurtosis estimator. Monthly notices of the Royal Astronomical Society, 510(2), 1597-1611. https://doi.org/10.1093/mnras/stab3434

We describe how to implement the spectral kurtosis method of interference removal (zapping) on a digitized signal of averaged power values. Spectral kurtosis is a hypothesis test, analogous to the t-test, with a null hypothesis that the amplitudes fr... Read More about Removal and replacement of interference in tied-array radio pulsar observations using the spectral kurtosis estimator.

Noise analysis in the European Pulsar Timing Array data release 2 and its implications on the gravitational-wave background search (2021)
Journal Article
Chalumeau, A., Babak, S., Petiteau, A., Chen, S., Samajdar, A., Caballero, R. N., Theureau, G., Guillemot, L., Desvignes, G., Parthasarathy, A., Liu, K., Shaifullah, G., Hu, H., Van Der Wateren, E., Antoniadis, J., Bak Nielsen, A. S., Bassa, C. G., Berthereau, A., Burgay, M., Champion, D. J., …Xu, H. (2022). Noise analysis in the European Pulsar Timing Array data release 2 and its implications on the gravitational-wave background search. Monthly notices of the Royal Astronomical Society, 509(4), 5538-5558. https://doi.org/10.1093/mnras/stab3283

The European Pulsar Timing Array (EPTA) collaboration has recently released an extended data set for six pulsars (DR2) and reported evidence for a common red noise signal. Here we present a noise analysis for each of the six pulsars. We consider seve... Read More about Noise analysis in the European Pulsar Timing Array data release 2 and its implications on the gravitational-wave background search.

Use Case of Building an Indoor Air Quality Monitoring System (2021)
Presentation / Conference Contribution
Kureshi, R. R., Thakker, D., Mishra, B. K., & Ahmed, B. (2021, June). Use Case of Building an Indoor Air Quality Monitoring System. Presented at 7th IEEE World Forum on Internet of Things, WF-IoT 2021, New Orleans, USA

On average, we spend around 90% of the time in indoor environments. Indoor Air Quality (IAQ) has been receiving increased attention from the environmental bodies, local authorities and citizens as it is becoming clearer that poor IAQ has public healt... Read More about Use Case of Building an Indoor Air Quality Monitoring System.

Galaxy and mass assembly (GAMA): The merging potential of brightest group galaxies (2021)
Journal Article
Banks, K., Brough, S., Holwerda, B. W., Hopkins, A. M., López-Sánchez, R., Phillipps, S., Pimbblet, K. A., & Robotham, A. S. (2021). Galaxy and mass assembly (GAMA): The merging potential of brightest group galaxies. The Astrophysical journal, 921(1), 9. https://doi.org/10.3847/1538-4357/ac1c0a

Using a volume-limited sample of 550 groups from the Galaxy And Mass Assembly Galaxy Group Catalogue spanning the halo mass range 12.8 < log[Mh M?] < 14.2, we investigate the merging potential of central Brightest Group Galaxies (BGGs). We use spectr... Read More about Galaxy and mass assembly (GAMA): The merging potential of brightest group galaxies.

PSR J2222-0137: I. Improved physical parameters for the system (2021)
Journal Article
Guo, Y. J., Freire, P. C., Guillemot, L., Kramer, M., Zhu, W. W., Wex, N., Mckee, J. W., Deller, A., Ding, H., Kaplan, D. L., Stappers, B., Cognard, I., Miao, X., Haase, L., Keith, M., Ransom, S. M., & Theureau, G. (2021). PSR J2222-0137: I. Improved physical parameters for the system. Astronomy and Astrophysics, 654, Article A16. https://doi.org/10.1051/0004-6361/202141450

Context. The PSR J2222-0137 binary system has a set of features that make it a unique laboratory for tests of gravity theories. Aims. To fully exploit the system's potential for these tests, we aim to improve the measurements of its physical paramete... Read More about PSR J2222-0137: I. Improved physical parameters for the system.

Strong-field gravity tests with the double pulsar (2021)
Journal Article
Kramer, M., Stairs, I. H., Manchester, R. N., Wex, N., Deller, A. T., Coles, W. A., Ali, M., Burgay, M., Camilo, F., Cognard, I., Damour, T., Desvignes, G., Ferdman, R. D., Freire, P. C., Grondin, S., Guillemot, L., Hobbs, G. B., Janssen, G., Karuppusamy, R., Lorimer, D. R., …Theureau, G. (2021). Strong-field gravity tests with the double pulsar. Physical Review X, 11(4), Article 041050. https://doi.org/10.1103/PhysRevX.11.041050

Continued timing observations of the double pulsar PSR J0737-3039A/B, which consists of two active radio pulsars (A and B) that orbit each other with a period of 2.45 h in a mildly eccentric (e=0.088) binary system, have led to large improvements in... Read More about Strong-field gravity tests with the double pulsar.

Sand mining far outpaces natural supply in a large alluvial river (2021)
Journal Article
Hackney, C. R., Vasilopoulos, G., Heng, S., Darbari, V., Walker, S., & Parsons, D. R. (2021). Sand mining far outpaces natural supply in a large alluvial river. Earth surface dynamics European Geosciences Union, 9(5), 1323-1334. https://doi.org/10.5194/esurf-9-1323-2021

The world's large rivers are facing reduced sediment loads due to anthropogenic activities such as hydropower development and sediment extraction. Globally, estimates of sand extraction from large river systems are lacking, in part due to the pervasi... Read More about Sand mining far outpaces natural supply in a large alluvial river.

Fusion of multi-temporal paz and sentinel-1 data for crop classification (2021)
Journal Article
Busquier, M., Valcarce-Diñeiro, R., Lopez-Sanchez, J. M., Plaza, J., Sánchez, N., & Arias-Pérez, B. (2021). Fusion of multi-temporal paz and sentinel-1 data for crop classification. Remote Sensing, 13(19), Article 3195. https://doi.org/10.3390/rs13193915

The accurate identification of crops is essential to help environmental sustainability and support agricultural policies. This study presents the use of a Spanish radar mission, PAZ, to classify agricultural areas with a very high spatial resolution.... Read More about Fusion of multi-temporal paz and sentinel-1 data for crop classification.

Galaxy and mass assembly (GAMA): The environmental impact on SFR and metallicity in galaxy groups (2021)
Journal Article
Sotillo-Ramos, D., Lara-López, M. A., Pérez-García, A. M., Pérez-Martínez, R., Hopkins, A. M., Holwerda, B. W., Liske, J., López-Sánchez, A. R., Owers, M. S., & Pimbblet, K. A. (2021). Galaxy and mass assembly (GAMA): The environmental impact on SFR and metallicity in galaxy groups. Monthly notices of the Royal Astronomical Society, 508(2), 1817-1830. https://doi.org/10.1093/mnras/stab2641

We present a study of the relationships and environmental dependencies between stellar mass, star formation rate, and gas metallicity for more than 700 galaxies in groups up to redshift 0.35 from the Galaxy And Mass Assembly (GAMA) survey. To identif... Read More about Galaxy and mass assembly (GAMA): The environmental impact on SFR and metallicity in galaxy groups.

Profile changes associated with dispersion measure events in PSR J1713+0747 (2021)
Journal Article
Lin, F. X., Lin, H. H., Luo, J., Main, R., McKee, J., Pen, U. L., Simard, D., & van Kerkwijk, M. H. (2021). Profile changes associated with dispersion measure events in PSR J1713+0747. Monthly notices of the Royal Astronomical Society, 508(1), 1115-1127. https://doi.org/10.1093/mnras/stab2529

Propagation effects in the interstellar medium and intrinsic profile changes can cause variability in the timing of pulsars, which limits the accuracy of fundamental science done via pulsar timing. One of the best timing pulsars, PSR J1713+0747, has... Read More about Profile changes associated with dispersion measure events in PSR J1713+0747.

Quantitative morphology of galaxy clusters at X-ray wavelengths (2021)
Thesis
Hunt, L. Quantitative morphology of galaxy clusters at X-ray wavelengths. (Thesis). University of Hull. https://hull-repository.worktribe.com/output/4224267

We apply quantitative morphology techniques to X-ray imaging of clusters of galaxies to determine correlation between calculated parameters (CAS, Gini and M20) and features such as bow shocks, cold fronts, gas sloshing, Kelvin-Helmholtz instabilities... Read More about Quantitative morphology of galaxy clusters at X-ray wavelengths.

Dynamics of salt intrusion in the Mekong Delta: Results of field observations and integrated coastal-inland modelling (2021)
Journal Article
Eslami, S., Hoekstra, P., Kernkamp, H. W. J., Nguyen Trung, N., Do Duc, D., Nguyen Nghia, H., Tran Quang, T., Van Dam, A., Darby, S. E., Parsons, D. R., Vasilopoulos, G., Braat, L., & Van Der Vegt, M. (2021). Dynamics of salt intrusion in the Mekong Delta: Results of field observations and integrated coastal-inland modelling. Earth surface dynamics European Geosciences Union, 9(4), 953-976. https://doi.org/10.5194/esurf-9-953-2021

On the list of challenges facing the world largest deltas, increased saline water intrusion (SWI) in the surface water system and its role in jeopardizing freshwater supply are often ranked very high. Yet, detailed process-based studies of SWI at the... Read More about Dynamics of salt intrusion in the Mekong Delta: Results of field observations and integrated coastal-inland modelling.

A multi-approach and multi-scale platform to model CD4+ T cells responding to infections (2021)
Journal Article
Wertheim, K. Y., Puniya, B. L., La Fleur, A., Shah, A. R., Barberis, M., & Helikar, T. (2021). A multi-approach and multi-scale platform to model CD4+ T cells responding to infections. PLoS Computational Biology, 17(8), Article e1009209. https://doi.org/10.1371/journal.pcbi.1009209

Immune responses rely on a complex adaptive system in which the body and infections interact at multiple scales and in different compartments. We developed a modular model of CD4+ T cells, which uses four modeling approaches to integrate processes at... Read More about A multi-approach and multi-scale platform to model CD4+ T cells responding to infections.

Pulsars with NenuFAR: Backend and pipelines (2021)
Journal Article
Bondonneau, L., Grießmeier, J. M., Theureau, G., Cognard, I., Brionne, M., Kondratiev, V., Bilous, A., McKee, J. W., Zarka, P., Viou, C., Guillemot, L., Chen, S., Main, R., Pilia, M., Possenti, A., Serylak, M., Shaifullah, G., Tiburzi, C., Verbiest, J. P., Wu, Z., …Tasse, C. (2021). Pulsars with NenuFAR: Backend and pipelines. Astronomy and Astrophysics, 652, https://doi.org/10.1051/0004-6361/202039339

Context. NenuFAR (New extension in Nançay upgrading LOFAR) is a new radio telescope developed and built on the site of the Nançay Radio Observatory. It is designed to observe the largely unexplored frequency window from 10 to 85 MHz, offering a high... Read More about Pulsars with NenuFAR: Backend and pipelines.

Refined mass and geometric measurements of the high-mass PSR J0740+6620 (2021)
Journal Article
Fonseca, E., Cromartie, H. T., Pennucci, T. T., Ray, P. S., Kirichenko, A. Y., Ransom, S. M., Demorest, P. B., Stairs, I. H., Arzoumanian, Z., Guillemot, L., Parthasarathy, A., Kerr, M., Cognard, I., Baker, P. T., Blumer, H., Brook, P. R., Decesar, M., Dolch, T., Dong, F. A., Ferrara, E. C., …Zhu, W. W. (2021). Refined mass and geometric measurements of the high-mass PSR J0740+6620. Astrophysical journal. Letters, 915(1), Article L12. https://doi.org/10.3847/2041-8213/ac03b8

We report results from continued timing observations of PSR J0740+6620, a high-mass, 2.8 ms radio pulsar in orbit with a likely ultracool white dwarf companion. Our data set consists of combined pulse arrival-time measurements made with the 100 m Gre... Read More about Refined mass and geometric measurements of the high-mass PSR J0740+6620.

The CHIME Pulsar Project: System Overview (2021)
Journal Article
Amiri, M., Bandura, K. M., Boyle, P. J., Brar, C., Cliche, J. F., Crowter, K., Cubranic, D., Demorest, P. B., Denman, N. T., Dobbs, M., Dong, F. Q., Fandino, M., Fonseca, E., Good, D. C., Halpern, M., Hill, A. S., Höfer, C., Kaspi, V. M., Landecker, T. L., Leung, C., …Wang, X. (2021). The CHIME Pulsar Project: System Overview. Astrophysical Journal Supplement, 255(1), Article 5. https://doi.org/10.3847/1538-4365/abfdcb

We present the design, implementation, and performance of the digital pulsar observing system constructed for the Canadian Hydrogen Intensity Mapping Experiment (CHIME). Using accelerated computing, this system processes independent, digitally steere... Read More about The CHIME Pulsar Project: System Overview.

Establishing sustainable sediment budgets is critical for climate-resilient mega-deltas (2021)
Journal Article
Vasilopoulos, G., Quan, Q. L., Parsons, D. R., Darby, S. E., Tri, V. P. D., Hung, N. N., Haigh, I. D., Voepel, H. E., Nicholas, A. P., & Aalto, R. (2021). Establishing sustainable sediment budgets is critical for climate-resilient mega-deltas. Environmental Research Letters, 16(6), Article 064089. https://doi.org/10.1088/1748-9326/ac06fc

Many of the world's major river deltas face a sustainability crisis, as they come under threat of increases in salinity and the extent of tidal zones forced by combinations of sea-level rise, changes in river discharge and channel geometry. The relat... Read More about Establishing sustainable sediment budgets is critical for climate-resilient mega-deltas.

Urban Crime and Security (2021)
Book Chapter
Cheng, T., & Chen, T. (2021). Urban Crime and Security. In W. Shi, M. F. Goodchild, M. Batty, M.-P. Kwan, & A. Zhang (Eds.), Urban Informatics (213-228). Springer. https://doi.org/10.1007/978-981-15-8983-6_14

Scientists have an enduring interest in understanding urban crime and developing security strategies for mitigating this problem. This chapter reviews the progress made in this topic from historic criminology to data-driven policing. It first reviews... Read More about Urban Crime and Security.

Prediction of crop biophysical variables with panel data techniques and radar remote sensing imagery (2021)
Journal Article
de Blas, C. S., Valcarce-Diñeiro, R., Sipols, A. E., Sánchez Martín, N., Arias-Pérez, B., & Santos-Martín, M. T. (2021). Prediction of crop biophysical variables with panel data techniques and radar remote sensing imagery. Biosystems Engineering, 205, 76-92. https://doi.org/10.1016/j.biosystemseng.2021.02.014

Since the late 1970s, remote sensing techniques have been proven to be suitable for characterizing and monitoring plants and crops. In particular, synthetic aperture radar (SAR) missions contribute considerably to this prediction effort. However, the... Read More about Prediction of crop biophysical variables with panel data techniques and radar remote sensing imagery.