scholarly journals Long-term evolution of small icy bodies of the Solar System

2009 ◽  
Vol 5 (S263) ◽  
pp. 121-125 ◽  
Author(s):  
Dina Prialnik
Keyword(s):  
Kuiper Belt ◽  
Radioactive Decay ◽  
Main Belt ◽  
Kuiper Belt Object ◽  
Amorphous Ice ◽  
The Core ◽  
Porous Core ◽  
Term Evolution ◽  
Highly Porous

AbstractDetailed evolutionary calculations spanning 4.6 × 109 yr are presented for (a) a model representing main-belt comet 133P/Elst-Pizarro, considering different initial mixtures of ices and dust, and (b) a Kuiper Belt object heated by radioactive decay, growing in size from an initial radius of 10 km to a final 250 km.It is shown that for the main-belt comet only crystalline H2O ice may survive in the interior of the nucleus, and may be found at depths ranging from ~50 to 150 m. Other volatiles will be completely lost. For the large Kuiper Belt object, evaporation and flow of water and vapor gradually remove the water from the core and the final (present) structure is differentiated, with a rocky, highly porous core of 80 km radius. Outside the core, due to refreezing of water vapor, a compact, ice-rich layer forms, a few tens of km thick. The amorphous ice is preserved in an outer layer about 20 km thick.

The long-term evolution of the main asteroidal belt and the origin of large Mars- and Earth-crossers

1999 ◽  
Vol 173 ◽  
pp. 321-323
Author(s):  
D. Nesvorný ◽  
A. Morbidelli
Keyword(s):  
Numerical Simulations ◽  
Time Scales ◽  
Main Belt ◽  
Subsequent Evolution ◽  
Chaotic Process ◽  
The Earth ◽  
Term Evolution ◽  
Asteroidal Belt ◽  
Near Earth Asteroids

AbstractResults of numerical simulations show that the orbits of asteroids in the inner part of the main belt may gradually, subject to a chaotic process acting on 10-100 Myr time scales, become more elliptic and start intersecting the orbit of Mars. The subsequent evolution of an asteroid having close encounters with Mars frequently leads to the Earth-crossing orbit. This revolutionary scenario of the origin of near-Earth asteroids was quantified by Miglioriniet al.(1998) and here we discuss some of the aspects of this work.

Religion, Secularity, and Secularization in Europe

2021 ◽  
pp. 267-284
Author(s):  
Grace Davie
Keyword(s):  
Long Term Evolution ◽  
The Self ◽  
The Core ◽  
Term Evolution ◽  
Conceptual Understandings ◽  
Late Twentieth ◽  
Modern Europe ◽  
The Rich

The first section of this chapter covers the conceptual understandings of secular, secularization, secularity and secularism, together with the rich sources of data available in Europe. It argues that secularization is neither linear nor predictable; it is a complex and contingent process that takes place differently in different places both within Europe and beyond. The second section recalls the long-term evolution of the secular in Europe as a whole. The core of the chapter, however, focuses on the late twentieth and twenty-first centuries. This period is considered both chronologically and thematically with the following question in mind: is Europe secular because it is modern, or is Europe secular because it is European? Given the growing conviction that Europe is unusually secular in global terms, it seems that the latter is more likely. Secularization is central to the self-understanding of modern Europe; it should not be assumed, however, that secularization is a necessary—thus universal—concomitant of modernization.

Brief summary of Kleť photographic search programme for minor planets

1999 ◽  
Vol 173 ◽  
pp. 189-192
Author(s):  
J. Tichá ◽  
M. Tichý ◽  
Z. Moravec
Keyword(s):  
Ccd Camera ◽  
Minor Planet ◽  
Minor Planets ◽  
Main Belt

AbstractA long-term photographic search programme for minor planets was begun at the Kleť Observatory at the end of seventies using a 0.63-m Maksutov telescope, but with insufficient respect for long-arc follow-up astrometry. More than two thousand provisional designations were given to new Kleť discoveries. Since 1993 targeted follow-up astrometry of Kleť candidates has been performed with a 0.57-m reflector equipped with a CCD camera, and reliable orbits for many previous Kleť discoveries have been determined. The photographic programme results in more than 350 numbered minor planets credited to Kleť, one of the world's most prolific discovery sites. Nearly 50 per cent of them were numbered as a consequence of CCD follow-up observations since 1994.This brief summary describes the results of this Kleť photographic minor planet survey between 1977 and 1996. The majority of the Kleť photographic discoveries are main belt asteroids, but two Amor type asteroids and one Trojan have been found.

Russia’s Development Strategy: Guidelines and Restrictions

2008 ◽  
pp. 119-130 ◽  
Author(s):  
V. Senchagov
Keyword(s):  
Economic Development ◽  
Development Strategy ◽  
Conceptual Basis ◽  
The Core ◽  
Economic Development Strategy ◽  
Socio Economic Development ◽  
Rates Of Growth

The core of Russia’s long-term socio-economic development strategy is represented by its conceptual basis. Having considered debating points about the essence and priority of the strategy, the author analyzes the logic and stages of its development as well as possibilities, restrictions and risks of high GDP rates of growth.

Link-Level Simulator for Wireless local Area Network

2018 ◽  
Vol 6 (7) ◽  
pp. 314
Author(s):  
Chaithra. H. U ◽  
Vani H.R
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area Networks ◽  
Local Area ◽  
Long Term Evolution ◽  
Wireless Local Area Networks ◽  
Area Network ◽  
Network Simulator ◽  
Term Evolution

Now a days in Wireless Local Area Networks (WLANs) used in different fields because its well-suited simulator and higher flexibility. The concept of WLAN  with  advanced 5th Generation technologies, related to a Internet-of-Thing (IOT). In this project, representing the Network Simulator (NS-2) used linked-level simulators for Wireless Local Area Networks and still utilized IEEE 802.11g/n/ac with advanced IEEE 802.11ah/af technology. Realization of the whole Wireless Local Area Networking linked-level simulators inspired by the recognized Vienna Long Term Evolution- simulators. As a outcome, this is achieved to link together that simulator to detailed performances of Wireless Local Area Networking with Long Term Evolution, operated in the similar RF bands. From the advanced 5th Generation support cellular networking, such explore is main because different coexistences scenario can arise linking wireless communicating system to the ISM and UHF bands.

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