Results 41 to 50 of about 48,210 (191)
Transactions of the Institute of British Geographers, EarlyView.Abstract Based on recently opened multilingual archives, this paper addresses relationally three transnational cases of early networking for critical and radical geography that took place in different countries and languages between the 1970s and the 1980s.
Federico Ferretti
wiley +1 more source
Binary Interactions, High-Speed Outflows and Dusty Disks during the AGB-To-PN Transition
Galaxies, 2018 It is widely believed that the dramatic transformation of the spherical outflows of AGB stars into the extreme aspherical geometries seen during the planetary nebula (PN) phase is linked to binarity and driven by the associated production of fast jets ...
Raghvendra Sahai
doaj +1 more source
Protracted Timescales for Nebular Processing of First-formed Solids in the Solar System
The Astrophysical Journal, 2023 The calcium–aluminum-rich inclusions (CAIs) from chondritic meteorites are the first solids formed in the solar system. Rim formation around CAIs marks a time period in early solar system history when CAIs existed as free-floating objects and had not yet
Prajkta Mane +3 more
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Chemical Abundances and Dust in Planetary Nebulae in the Galactic Bulge [PDF]
ApJ (2008) 680, 1206, 2008 We present mid-infrared Spitzer spectra of eleven planetary nebulae in the Galactic Bulge. We derive argon, neon, sulfur, and oxygen abundances for them using mainly infrared line fluxes combined with some optical line fluxes from the literature. Due to the high extinction toward the Bulge, the infrared spectra allow us to determine abundances for ...
arxiv +1 more source
(Re)wilding London: Fabric, politics, and aesthetics
Transactions of the Institute of British Geographers, EarlyView.Short Abstract Rewilding has become established as a new mode of nature conservation. Until recently, cities and the urban were neglected by rewilding discourse; the idea of urban rewilding seen as oxymoronic. Of late, however, there has been a shift, with growing enthusiasm amongst metropolitan authorities, civil society, and citizens in major cities.
Jonathon Turnbull +2 more
wiley +1 more source
The Origin of the Consistent Planetary Nebula Luminosity Function Bright-end Cutoff
The Astrophysical Journal, 2023 The [O iii ] 5007 Å line is typically the brightest line in planetary nebula (PN) spectra. Observations show that the brightest [O iii ] 5007 Å PN in a galaxy—the planetary nebula luminosity function (PNLF) bright-end cutoff—is surprisingly independent ...
Philippe Z. Yao, Eliot Quataert
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The Evidence for a Binary origin of the Young Planetary Nebula HB 12 [PDF]
Astron.J.131:3040-3046,2006, 2006 The young planetary nebulae play an important role in stellar evolution when intermediate- to low-mass stars (0.8 $\sim$ 8 M$_\odot$) evolve from the proto-planetary nebulae phase to the planetary nebulae phase. Many young planetary nebulae display distinct bipolar structures as they evolve away from the proto-planetary nebulae phase.
arxiv +1 more source
Rapid Communications in Mass Spectrometry, Volume 39, Issue 13, 15 July 2025.ABSTRACT Rationale Matrix effects by secondary ion mass spectrometry (SIMS) are empirically corrected by calibration using matrix‐matched reference materials. However, conventional parametric regression cannot estimate the prediction uncertainty to account for the difference in compositions of new data and reference materials. Applying Gaussian process
Keita Itano +5 more
wiley +1 more source
British Educational Research Journal, Volume 51, Issue 2, Page 826-847, April 2025.Abstract This study addresses the complex challenges of childhood obesity, food poverty and environmental degradation by developing a planetary health framework for school food in education. Drawing on Dewey's experiential learning philosophy, it adopts an integrative approach where school meals and food education converge.
Fatma Sabet, Steffen Böhm
wiley +1 more source
Exploring the high abundance discrepancy in the planetary nebula IC 4663
Frontiers in Astronomy and Space Sciences, 2023 This article presents an in-depth analysis of integral field unit spectroscopy performed on the Galactic planetary nebula (PN) IC 4663, with a primary focus on investigating its physical characteristics, chemical composition, and morphological properties.
M. Mohery +4 more
doaj +1 more source