Results 81 to 90 of about 10,634 (253)
Boreas, EarlyView.The relationship between the climate and societal transformation in Maya lowlands has long been debated, particularly the role of drought in shaping the civilization trajectory during the Classic Period. A high‐resolution, multi‐proxy, geochemical record from Lake Kaná, located in the underexplored Uaymil region of the Yucatán Peninsula in Mexico ...
Haydar B. Martinez‐Dyrzo +5 more
wiley +1 more source
Modeling the Meteoroid Environment Far from the Ecliptic Plane
The Planetary Science JournalWe describe a new version (numbered 3.1) of NASA’s Meteoroid Engineering Model, in which we extend the model to handle locations that lie more than a few degrees in latitude off the ecliptic plane.
Althea V. Moorhead +3 more
doaj +1 more source
Earth and Planetary PhysicsOptical monitoring of fireballs can provide reconstructions of luminous trajectories and the derivation of heliocentric orbits, whereas spectral observations are able to supply information from an entirely different perspective, with composition and ...
ZhiJian Xu +3 more
doaj +1 more source
The mesospheric metal layer topside: a possible connection to meteoroids [PDF]
Atmospheric Chemistry and Physics, 2004 In the past, many studies have been carried out to demonstrate the influence of meteoroids on the atmospheric metal layer, observed roughly in the altitude range 80–105 km.
J. Höffner, J. S. Friedman
doaj
Choice Feminism and the Opt‐Out Phenomenon: Is It Possible to Speak of Free Will?
Gender, Work &Organization, EarlyView.ABSTRACT The aim of this research was to question choice feminism in the light of the opt‐out phenomenon, through a thematic narrative analysis of the professional trajectories of five Brazilian women with university degrees. As a result of the research—and the main contribution to the advancement of knowledge in the field—it was found that although ...
Paula Furtado Hartmann de Queiroz Monteiro +3 more
wiley +1 more source
Evaporation of high speed sporadic meteors [PDF]
Atmospheric Chemistry and Physics, 2004 Recent measurements conducted at the Arecibo Observatory report high-speed sporadic meteors having velocities near 50 km/s. The results seem to indicate a bimodal velocity distribution in the sporadic meteors (maxima at ~20 km/s and ~50 km/s).
E. Murad, C. Roth
doaj
Journal of Fish Biology, EarlyView.Abstract Deep‐sea elasmobranchs are less resilient to the increasing scale of anthropogenic impacts such as fisheries, owing to their life‐history traits. The necessity for proper management measures is hampered by the scant knowledge on these taxa and their biology. Here we provide the first comprehensive insight into the parasite infracommunities and
Wolf Isbert +5 more
wiley +1 more source
Electron microscopy‐based three‐dimensional subcellular imaging of plant male gametophyte
Journal of Integrative Plant Biology, EarlyView.The Aquilos2 Cryo‐FIB workflows provide practical routes for cryo‐electron tomography and volume imaging in plant structural biology. ABSTRACT Understanding cellular events in three dimensions (3D) is of great importance for the annotation and illustration of biological processes in a contextual way. Imaging techniques based on electron microscopy (EM),
Zhiqi Liu +9 more
wiley +1 more source
Earth and Space ScienceThe longest known Aletai meteorite belt presents a unique phenomenon in meteoroid dynamics. To investigate its formation mechanism, this study introduces a bilobate‐shaped meteoroid model, emphasizing aerodynamic interactions and structure evolution. The
Haoyu Li +3 more
doaj +1 more source
Autonomous spectrographic system to analyse the main elements of fireballs and meteors
Earth, Planets and Space, 2018 We present a meteor observation system based on imaging CCD cameras, wide-field optics and a diffraction grating. This system is composed of two independent spectrographs with different configurations, which allows us to capture images of fireballs and ...
Francisco Ángel Espartero +4 more
doaj +1 more source