Results 81 to 90 of about 25,279 (299)
Thermal Evolution of the Nucleus of the Comet 67P for 120 Years: Numerical Simulations
Open Astronomy, 2018 The purpose of this paper is to estimate to what temperatures and to what depth the outer layers of the cometary nuclei are heated for several dozen revolutions around the Sun, and what changes in the composition of the volatiles occur in this case. This
Rusol Andrey V., Dorofeeva Vera A.
doaj +1 more source
Ground-based photometry of comets in the spectral interval 3000 to 3500 angstrom [PDF]
, 1981 Abundances and production rates of CN, C3, and C2 for fifteen comets were determined and the variation of these parameters with helicentric distance for two comets were monitored.
Ahearn, M. F., Willis, R. L.
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Advanced Electronic Materials, EarlyView.This review summarizes the developments in field‐effect transistor (FET)‐based dual‐mode sensor platforms and what can be learned from them. It identifies charge as a crucial factor in biomolecular interactions at interfaces, outlines the challenges of hybrid systems, and highlights their benefits.
Roger Hasler +4 more
wiley +1 more source
Photoluminescence and Cathodoluminescence of the Solid Cometary Substance
Open Astronomy, 2019 We have proposed that solar ultraviolet and corpuscular radiations may excite photoluminescence and cathodoluminescence of the solid cometary substance including mineral halos of comets.
Simonia Irakli, Gucsik Arnold
doaj +1 more source
Did comets kick-start life on Earth? Chemists find missing piece of puzzle [PDF]
, 2016 First paragraph: The origin of life on Earth has been a matter of intense debate throughout human history. Even today, scientists don’t know whether the molecular building blocks of life were created on Earth or whether they were brought here by comets ...
Schroeder, Christian
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Alternative Policy Designs to Help Farmers Select Profitable Conservation Practices
Agribusiness, EarlyView.ABSTRACT Voluntary private carbon initiatives (VPCIs) promote the implementation of agricultural conservation practices that mitigate emissions of greenhouse gases (GHGs) via financial incentives to participating farmers. Simultaneously, an array of public policies supports the adoption of conservation practices through technical and financial ...
Oranuch Wongpiyabovorn +1 more
wiley +1 more source
Angewandte Chemie, EarlyView.Klassische Knorr‐Chemie trifft auf moderne Biokatalyse. Die Threonindehydrogenase erzeugt aus l‐Threonin Aminoaceton, welches direkt in einer chemoenzymatischen Knorr‐Pyrrolsynthese abgefangen wird. Ein bifunktionales β‐Dicarbonylsubstrat dient sowohl als Pyrrolbaustein als auch als Hydridakzeptor für integrierte NAD+‐Recyclierung und ermöglicht die ...
Valentina Jurkaš +8 more
wiley +1 more source
Brightness Behavior of Distant Oort Cloud Comets
The Planetary Science JournalDynamically new comets provide important insights into the conditions of the presolar nebula and its evolution, as they are believed to have experienced minimal solar heating before their discovery.
Carrie E. Holt +17 more
doaj +1 more source
Determination of orbits of comets: P/Kearns-Kwee, P/Gunn, including nongravitational effects in the comets' motion [PDF]
, 1992 To improve the orbits, all the positional observations of the comets were collected. The observations were selected and weighted according to objective mathematical criteria and the mean residuals a priori were calculated for both comets.
Todorovic-Juchniewicz, Bozenna +1 more
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