Results 21 to 30 of about 665 (145)

Thin‐film lithium niobate photonics: Frontiers in millimeter‐wave and terahertz generation and integrated applications

InfoScience, EarlyView.
With the advancement of 6G communications, high‐precision radar, and advanced imaging technologies, there is a growing demand for compact, high‐performance light sources capable of generating high‐frequency radio waves (millimeter‐wave and terahertz waves). This article systematically introduces how to efficiently generate these high‐frequency waves on
Jianfeng Xiong, Zhenyu Wang, Xu Li, Guo Tang, Sizhe Wang, Jiyuan Huang, Guochao Wang, Shuhua Yan, Wenzhao Sun   +8 more
wiley   +1 more source

Diffusive Instabilities in Dusty Disks: Linear Growth and Nonlinear Breakdown

The Astrophysical Journal
We revisit the diffusive instability in dusty disks that arises when the dust mass diffusivity and/or viscosity decrease sufficiently steeply with increasing dust density. Our updated model includes an incompressible viscous gas that responds azimuthally
Konstantin Gerbig, Min-Kai Lin
doaj   +1 more source

Ray-tracing Simulations and Spectral Models of X-Ray Radiation in Dusty Media

The Astrophysical Journal, 2023
Dust can play an important role in shaping the X-ray spectra and images of astrophysical sources. In this work we report on the implementation of dust in the ray-tracing platform RefleX .
Claudio Ricci, Stéphane Paltani
doaj   +1 more source

The Great Cosmic Silence: What Does the Fermi Paradox Tell About the Future of Humanity?

Global Policy, EarlyView.
ABSTRACT This article examines how institutional time horizons shape the long‐term survival prospects of human technological civilisation. While research on global catastrophic and existential risks has expanded, the temporal structures of political‐economic institutions remain underexamined.
Heikki Patomäki
wiley   +1 more source

General Implicit Runge–Kutta Integrators for Multifluid Gas–Dust Aerodynamic Drag

The Astrophysical Journal
The integration of aerodynamic drag is a fundamental step in simulating dust dynamics in hydrodynamical simulations. We propose a novel integration scheme, designed to be compatible with Strang splitting techniques, which allows for the straightforward ...
Giovanni Tedeschi-Prades, Til Birnstiel, Klaus Dolag, Barbara Ercolano, Mark Hutchison   +4 more
doaj   +1 more source

A Catalog of 71 Coronal Line Galaxies in MaNGA: [Ne v] Is an Effective AGN Tracer

The Astrophysical Journal, 2023
Despite the importance of active galactic nuclei (AGNs) in galaxy evolution, accurate AGN identification is often challenging, as common AGN diagnostics can be confused by contributions from star formation and other effects (e.g., Baldwin–Phillips ...
James Negus, Julia M. Comerford, Francisco Müller Sánchez, Mitchell Revalski, Rogemar A. Riffel, Kevin Bundy, Rebecca Nevin, Sandro B. Rembold   +7 more
doaj   +1 more source

Visible, near‐, and thermal infrared spectra of asteroid Bennu samples: Relationship to and implications for remote sensing of carbonaceous asteroids

Meteoritics &Planetary Science, EarlyView.
Abstract Remote spectroscopy is used to characterize the mineralogy and infer the history of planetary bodies. Carbonaceous asteroids, such as B‐type (101955) Bennu, represent the earliest stages of planet formation. B types have a blue (negative) spectral slope and comprise <5% of asteroids.
V. E. Hamilton, E. A. Cloutis, R. E. Milliken, P. Haenecour, D. R. Golish, K. J. Domanik, T. J. McCoy, L. P. Keller, A. A. Simon, H. H. Kaplan, C. A. Goodrich, S. A. Sandford, D. Applin, T. Hiroi, D. H. Hill, N. G. Lunning, F. M. McCubbin, S. A. Eckley, C. J. Snead, E. H. Blumenfeld, J. E. Aebersold, C. Schultz, N. Bowles, K. A. Shirley, S. S. Russell, J. J. Barnes, T. J. Zega, D. N. DellaGiustina, A. J. Ryan, D. P. Glavin, J. P. Dworkin, H. C. Connolly Jr., D. S. Lauretta   +32 more
wiley   +1 more source

Toward a General Theory of Grain Alignment and Disruption by Radiative Torques and Magnetic Relaxation

The Astrophysical Journal
We generalize the magnetically enhanced radiative torque (MRAT) theory for astrophysical environments described by a dimensionless parameter U /( n _1 T _2 ) with U the radiation strength, n _1  =  n _H /(10 cm ^−3 ) the normalized hydrogen density, and ...
Thiem Hoang
doaj   +1 more source

Dust dynamic pressure and magnetopause displacement: reasons for non-detection [PDF]

Annales Geophysicae, 2013
In a recent paper, Treumann and Baumjohann (2011) propose that the contribution of dust particles to the solar wind dynamic pressure can cause large compressions of the Earth's magnetopause and suggest that this occurs when Earth encounters ...
I. Mann, M. Hamrin
doaj   +1 more source

LifeMet: Report on the 2024–2025 meteorite recovery expedition in Dronning Maud Land, Antarctica for the study of microbe–meteorite interactions

Meteoritics &Planetary Science, EarlyView.
Abstract Since the discovery of nine meteorites near the Yamato mountains in 1969, Antarctica has been recognized as a superb location for meteorite recovery. While Antarctic recovery expeditions prioritize meteorite preservation for mineralogical and planetary studies, meteorites are not typically collected for biological applications.
Rachael Lappan, Rachel S. Kirby, Andrew G. Tomkins   +2 more
wiley   +1 more source