Results 51 to 60 of about 10,510,627 (209)
Early long-period comets: their discovery and flux [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 By analysing recent comet catalogues, it is found that the flux of long-period comets to the inner solar system has been reasonably constant throughout the last two millennia. There is no evidence of periods of enhanced activity, or comet showers. The acuity of northern hemisphere naked-eye observers throughout the era of pre-telescopic astronomy was ...
openaire +1 more source
The long-term dynamical behavior of short-period comets [PDF]
, 1993 The orbits of the known short-period comets under the influence of the Sun and all the planets except Mercury and Pluto are numerically integrated. The calculation was undertaken in order to determine the dynamical lifetimes for these objects as well as ...
Levison, Harold F., Duncan, Martin J.
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Cytogenotoxic Effects of Fluopyram in Allium cepa Root Cells Involving Microtubule Disruption
Environmental Toxicology, EarlyView.ABSTRACT Fluopyram is a next‐generation fungicide widely used in agriculture; however, its persistence in soils and mobility toward aquatic systems have raised concerns regarding potential ecotoxicological risks. This study evaluated the cytogenotoxic effects of a commercial fluopyram‐based pesticide formulation on Allium cepa root meristem cells ...
Carlos Filipe Camilo‐Cotrim +10 more
wiley +1 more source
Cytogenotoxic and Molecular Assessment of Pyrethrins on Non‐Target Allium cepa Roots
Environmental Toxicology, EarlyView.ABSTRACT The pyrethrins, which form a part of naturally occurring insecticidal chemicals derived from chrysanthemum flowers, not only provide rapid knockdown of a broad spectrum of insect pests but are also widely used in integrated pest management due to a generally favorable safety profile, largely attributed to low mammalian toxicity.
Yudum Yeltekin Uğur +2 more
wiley +1 more source
Studying Short-Period Comets and Long-Period Comets Detected by WISE/NEOWISE [PDF]
, 2014 The Wide-field Infrared Survey Explorer (WISE) mission surveyed the sky in four infrared wavelength bands (3.4, 4.6, 12 and 22 μm) between January 2010 and February 2011.
Kramer, Emily
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Weather, EarlyView.The English language is a gargantuan, gluttonous beast. It has become extraordinary in its powers of assimilation – such that we rarely consider the origins of the words we use. In this paper, we will shed light on these origins, including the Pontic–Caspian steppe, the British Empire and, of course, a TV show.
Kieran M. R. Hunt
wiley +1 more source
Approach to exploring interstellar objects and long-period comets [PDF]
, 2019 This paper aims to identify the best approaches for exploring planetary bodies with very long orbital periods, i.e., bodies that approach Earth only once in a lifetime.
Castillo-Rogez, Julie C. +3 more
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Gender &History, EarlyView.ABSTRACT In 1955, two female factory workers and trade union leaders, Tan Lee Eng and Kwek Tai Eng, established the Singapore Women's Federation (SWF) to unite women regardless of race, religion or class for the anti‐colonial nationalist struggle. Singapore Chinese left‐wing feminism emerged at the confluence of the nationalist interest in mobilising ...
Yee‐Ting Leong
wiley +1 more source
On the Rate of Ejection of Dust by Long-Period Comets [PDF]
Symposium - International Astronomical Union, 1972 A model of the interplanetary dust medium that includes two subsystems, a spherical component and a flat one, has been proposed by the author as a result of analysis of radar meteor orbits. The disintegration of short-period comets is the main source of the flat dust cloud, while the disintegration of long-period comets is the main source of the ...
openaire +1 more source
Long-term orbital evolution of short-period comets found in Project Cosmo-DICE [PDF]
, 1992 Orbital evolutions of about 160 short-period (SP) comets are numerically integrated for 4400 years in the framework of a realistic dynamical model. By the round-trip error in closure test, a reliable time space of the integrated orbits is estimated for ...
Nakamura, Tsuko, Yoshikawa, Makoto
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