Results 51 to 60 of about 28,044 (289)

Rethinking plastic waste: innovations in enzymatic breakdown of oil‐based polyesters and bioplastics

FEBS Open Bio, EarlyView.
Plastic pollution remains a critical environmental challenge, and current mechanical and chemical recycling methods are insufficient to achieve a fully circular economy. This review highlights recent breakthroughs in the enzymatic depolymerization of both oil‐derived polyesters and bioplastics, including high‐throughput protein engineering, de novo ...
Elena Rosini, Nicolò Antonelli, Gianluca Molla   +2 more
wiley   +1 more source

Forecasting the Population of Globular Cluster Streams in Milky Way–type Galaxies

The Astrophysical Journal
Thin stellar streams originating from globular clusters (GCs) are among the most sensitive tracers of low-mass dark matter subhalos. Joint analysis of the entire population of stellar streams will place the most robust constraints on the dark matter ...
Sarah Pearson, Ana Bonaca, Yingtian Chen, Oleg Y. Gnedin   +3 more
doaj   +1 more source

Stellar Escape from Globular Clusters. I. Escape Mechanisms and Properties at Ejection

The Astrophysical Journal, 2023
The theory of stellar escape from globular clusters (GCs) dates back nearly a century, especially the gradual evaporation of GCs via two-body relaxation coupled with external tides. More violent ejection can also occur via strong gravitational scattering,
Newlin C. Weatherford, Fulya Kıroğlu, Giacomo Fragione, Sourav Chatterjee, Kyle Kremer, Frederic A. Rasio   +5 more
doaj   +1 more source

Finite, Intense Accretion Bursts from Tidal Disruption of Stars on Bound Orbits

, 2012
We study accretion processes for tidally disrupted stars approaching supermassive black holes on bound orbits, by performing three dimensional Smoothed Particle Hydrodynamics simulations with a pseudo-Newtonian potential. We find that there is a critical
Hayasaki, Kimitake, Loeb, Abraham, Stone, Nicholas   +2 more
core   +1 more source

Building up the Stellar Halo of the Galaxy [PDF]

, 1999
We study numerical simulations of satellite galaxy disruption in a potential resembling that of the Milky Way. Our goal is to assess whether a merger origin for the stellar halo would leave observable fossil structure in the phase-space distribution of ...
A. Helmi, Arnold R., Batsleer P., Beers T. C., Binney J., Binney J., Carney B. W., Carpintero D. D., Chiba M., Cole S., de Zeeuw P. T., Dejonghe H., Doinidis S. P., Eggen O. J., Freeman K. C., Fuchs B., Gilmore G. F., Goldstein H., Guzman R., Helmi A., Ibata R., Ibata R., Jenkins A., Johnston K. V., Johnston K. V., Johnston K. V., Katz N., Kauffmann G., Kauffmann G., Klessen R., Majewski S. R., Majewski S. R., Majewski S. R., Merritt D., Miyamoto M., Mo H. J., Navarro J. F., Oh K. S., Peebles P. J. P., Peebles P. J. P., Peebles P. J. P., Plummer H. C., Preston G., Quinn P. J., Ratnatunga K., Rodgers A. W., Rodgers A. W., S. D. M. White, Searle L., Sellwood J. A., Somerville R., Sommer-Larsen J., Steinmetz M., Steinmetz M., Tormen G., Tremaine S., Velazquez H., Velazquez H., White S. D. M., White S. D. M., Zaritsky D., Zhao H. S.   +61 more
core   +4 more sources

The Galactic Anticenter Stellar Stream

, 2003
12 pages, 4 figures; submitted to the Astrophysical Journal ...
Rocha-Pinto, Helio J., Majewski, Steven R., Skrutskie, M. F., Crane, Jeffrey D.   +3 more
openaire   +2 more sources

Stellar Stream Track Reconstruction, with Errors

, 2023
See https://ui.adsabs.harvard.edu/abs/2023MNRAS.522.5022S/abstract Stellar streams are sensitive probes of the Galactic potential. The likelihood of a model given stream data can only be assessed using simulations. However, comparison to simulation is challenging in a noisy 6D phase space in which even the stream paths are hard to quantify.
Starkman, Nathaniel, Calvetti, Daniela, Somersalo, Erkki, Webb, Jeremy, Bovy, Jo   +4 more
openaire   +1 more source

Hopfield Neural Networks for Online Constrained Parameter Estimation With Time‐Varying Dynamics and Disturbances

International Journal of Adaptive Control and Signal Processing, EarlyView.
This paper proposes two projector‐based Hopfield neural network (HNN) estimators for online, constrained parameter estimation under time‐varying data, additive disturbances, and slowly drifting physical parameters. The first is a constraint‐aware HNN that enforces linear equalities and inequalities (via slack neurons) and continuously tracks the ...
Miguel Pedro Silva
wiley   +1 more source

Stream Members Only: Data-driven Characterization of Stellar Streams with Mixture Density Networks

The Astrophysical Journal
Stellar streams are sensitive probes of the Milky Way’s gravitational potential. The mean track of a stream constrains global properties of the potential, while its fine-grained surface density constrains galactic substructure. A precise characterization
Nathaniel Starkman, Jacob Nibauer, Jo Bovy, Jeremy J. Webb, Kiyan Tavangar, Adrian Price-Whelan, Ana Bonaca   +6 more
doaj   +1 more source

Stellar Streams as Probes of Dark Halo Mass and Morphology: A Bayesian Reconstruction

, 2011
Tidal streams provide a powerful tool by means of which the matter distribution of the dark matter halos of their host galaxies can be studied. However, the analysis is not straightforward because streams do not delineate orbits, and for most streams ...
A. Varghese, Allgood, Bailin, Belokurov, Bett, Binney, Bullock, Carlberg, Combes, Conn, Conn, Conn, Debattista, Dehnen, Dehnen, Dehnen, Dubinski, Dubinski, Dubinski, Eyre, Eyre, Frenk, G. F. Lewis, Gregory, Grillmair, Grillmair, Helmi, Hoekstra, Ibata, Ibata, Ibata, Iodice, Jing, Kazantzidis, Koposov, Kuijken, Law, Law, Mackey, Majewski, Mandelbaum, Martínez-Delgado, Martínez-Delgado, Martínez-Delgado, Mayer, McConnachie, Merrifield, Mouhcine, Navarro, Newberg, Odenkirchen, Odenkirchen, Olling, O’Brien, O’Brien, O’Brien, O’Brien, Pfenniger, R. Ibata, Read, Sackett, Sackett, Springel, Teuben, White   +64 more
core   +1 more source