Results 71 to 80 of about 46,946 (311)

Collisions of Free-floating Planets with Evolved Stars in Globular Clusters [PDF]

The Astrophysical Journal, 2002
We estimate the rate of collisions between stars and free-floating planets (FFPs) in globular clusters, in particular the collision of FFPs with red giant branch (RGB) stars. Recent dynamical simulations imply that the density of such objects could exceed million per cubic parsec near the cores of rich globular clusters.
Soker, Noam, Rappaport, Saul, Fregeau, John   +2 more
openaire   +2 more sources

Experimental Analysis and Physics‐Based Analytical Model on Twisted and Coiled Artificial Muscles

Advanced Engineering Materials, EarlyView.
Twisted and coiled artificial muscles made from silver‐coated nylon fibers are investigated through experiments and analytical modeling. The actuators achieve contractions up to 19.3% and specific work of 8 kJ kg−1, though efficiency remains limited (≈0.15%) by thermal losses.
Salvatore Garofalo, Chiara Morano, Leonardo Pagnotta, Luigi Bruno   +3 more
wiley   +1 more source

Microlensing Constraints on the Stellar and Planetary Mass Functions

The Astronomical Journal
The mass function (MF) of isolated objects measured by microlensing consists of both a stellar and a planetary component. We compare the microlensing MFs of A. Gould et al. and T. Sumi et al. to other measurements of the MF. The abundance of brown dwarfs
Jennifer C. Yee, Scott J. Kenyon
doaj   +1 more source

Free-Floating Planets: Not So Surprising

, 2001
We find that free-floating planets can remain bound to a star cluster for much longer than was previously assumed: of the order of the cluster half-mass relaxation timescale as opposed to the crossing-time. This result is based on N-body simulations performed with the new GRAPE-6 special purpose hardware and is important in the context of the ...
Hurley, Jarrod R., Shara, Michael M.
openaire   +2 more sources

Nano‐Patterned CuO Nanowire Nanogap Hydrogen Gas Sensor with Voids

Advanced Functional Materials, Volume 35, Issue 12, March 18, 2025.
Sub‐5‐ppb hydrogen (H2) detection and sub‐10‐s response and recovery times are achieved based on nano‐patterned polycrystalline CuO nanowires nanogap gas sensors with voids using electron‐beam lithography and unique annealing processes. Pre‐H2 annealing, void‐generating oxidation, and downscaled nanogap electrodes are key to improving the sensing ...
Muqing Zhao, Ryosuke Nitta, Seiichiro Izawa, Jun‐ichi Yamaura, Yutaka Majima   +4 more
wiley   +1 more source

In Situ Formation of a Melt‐Solid Interface Toward Stable Oxygen Reduction in Protonic Ceramic Fuel Cells

Advanced Functional Materials, Volume 35, Issue 12, March 18, 2025.
Protonic ceramic fuel cells offer a promising route to generate power efficiently but face critical challenges in achieving industrially viable activity and stability at their cathodes in CO2‐containing air. This report proposes a new cathode material design strategy to enable the cathode to be both catalytically active and CO2 tolerant through the ...
Desheng Feng, Mengran Li, Vanessa K. Peterson, Rijia Lin, Anita D'Angelo, Olexandra Marenych, Anya Yago, Dominique Appadoo, Tianjiu Zhu, Muhammad Yazid Bin Zulkifli, Shuai Gao, Yuming Wu, Xiaohe Tian, Xiaoyang Du, Zhonghua Zhu   +14 more
wiley   +1 more source

Estimating Finite Source Effects in Microlensing Events due to Free-Floating Planets with the Euclid Survey

Advances in Astronomy, 2015
In recent years free-floating planets (FFPs) have drawn a great interest among astrophysicists. Gravitational microlensing is a unique and exclusive method for their investigation which may allow obtaining precious information about their mass and ...
Lindita Hamolli, Mimoza Hafizi, Francesco De Paolis, Achille A. Nucita   +3 more
doaj   +1 more source

Predictions for the Detection and Characterization of a Population of Free-floating Planets with K2 Campaign 9 [PDF]

, 2016
K2 Campaign 9 (K2C9) offers the first chance to measure parallaxes and masses of members of the large population of free-floating planets (FFPs) that has previously been inferred from measurements of the rate of short-timescale microlensing events. Using
M. Penny, N. Rattenbury, B. Gaudi, E. Kerins   +3 more
semanticscholar   +1 more source

Ideal Molecular Sieving with a Dense MOF for Helium Upgrading with Highly Diffusion Selective Mixed Matrix Membranes

Advanced Functional Materials, EarlyView.
The separation of Helium gas from natural gas is challenging but highly important. MIL‐116(Ga), a “non‐porous” metal–organic framework is used as a molecular sieve to separate He from CH4. Druse‐like MIL‐116(Ga) particles are integrated into polysulfone mixed matrix membranes.
Ayisha Komal, Laura Calderón‐Rodríguez, Oksana Smirnova, Eren Grossmann, Aparna Binu Varghese, Karen Marlenne Garcia Alvarez, Andreas Schneemann, Thomas Hoyer, Ralf Wyrwa, Felix Helmut Schacher, Alexander Knebel   +10 more
wiley   +1 more source

A Neptune-mass Free-floating Planet Candidate Discovered by Microlensing Surveys

, 2018
Current microlensing surveys are sensitive to free-floating planets down to Earth-mass objects. All published microlensing events attributed to unbound planets were identified based on their short timescale (below two days), but lacked an angular ...
Albrow, M. D., Cha, S. -M., Chung, S. -J., Gould, A., Han, C., Hwang, K. -H., Jung, Y. K., Kim, D. -J., Kim, H. -W., Kim, S. -L., Kozlowski, S., Lee, C. -U., Lee, D. -J., Lee, Y., Mroz, Przemek, Park, B. -G., Pawlak, M., Pietrukowicz, P., Pogge, R. W., Poleski, R., Ryu, Y. -H., Shin, I. -G., Skowron, J., Soszynski, I., Szymanski, M. K., Udalski, A., Ulaczyk, K., Yee, J. C., Zhu, W.   +28 more
core   +1 more source