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Stable Regions (stable + regions)

Distribution by Scientific Domains

Physics and Astronomy	50%

Selected Abstracts

Hydrology and water resources in monsoon Asia: a consideration of the necessity of establishing a standing research community of hydrology and water resources in the Asia Pacific region

HYDROLOGICAL PROCESSES, Issue 14 2003
Katumi Musiake
Abstract Hydrological and water resources issues appear very differently in different regions, and are strongly affected by geographical conditions. Hydrological knowledge and methodologies obtained in a specific region cannot necessarily be adapted to other regions. The purpose of this paper is to clarify one way to address adequately the regional characteristics of hydrology and water resources in monsoon Asia, especially the ,too much water' problems in the region. For this purpose, geomorphological factors, climatic factors and human intervention in the natural environment are taken into consideration as the three major factors governing the regional characteristics of the hydrology,water resources system. To identify geomorphological features macroscopically between the Asia Pacific region and other continental regions, the concepts ,tectonic zone' and ,stable region', which are two major subdivisions of continental masses in the world, are introduced. Also, a new climatic subdivision termed ,warm-humid' is proposed to express the abundant precipitation due to the Asian monsoon. Then, hydrological characteristics common or similar in ,warm-humid tectonic zones' in the Asia Pacific region, contrasted with those in stable regions, are enumerated together with the human intervention corresponding to these characteristics, and research targets peculiar to warm-humid tectonic zones are discussed. Finally, the establishment of a standing research community called ,Asia Pacific Association of Hydrology and Water Resources' is proposed to promote the exchange of operational knowledge and experience in water resources management, cooperative research activities, and professional education in the Asia Pacific region. Copyright © 2003 John Wiley & Sons, Ltd. [source]

Globalization and the National Security State: A Framework for Analysis,

INTERNATIONAL STUDIES REVIEW, Issue 2 2005
Norrin M. Ripsman
A growing body of scholarly literature argues that globalization has weakened the national security state. In this essay, we examine the globalization school's main propositions by analyzing the national security strategies of four categories of states: (1) major powers, (2) states in stable regions, (3) states in regions of enduring rivalries, and (4) weak and failed states. We conclude that the globalizations school's claims are overstated given that states of all types pursue more traditional security policies than they would expect. To the extent that globalization has affected the pursuit of national security, it has done so unevenly. States in stable regions appear to have embraced the changes rendered by globalization the most, states in regions of enduring rivalries the least. Although the weak and failed states also show signs of having been affected by globalization, many of the "symptoms" they manifest have more to do with internal difficulties than external challenges. [source]

Stable satellites around extrasolar giant planets

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Issue 3 2006
R. C. Domingos
ABSTRACT In this work, we study the stability of hypothetical satellites of extrasolar planets. Through numerical simulations of the restricted elliptic three-body problem we found the borders of the stable regions around the secondary body. From the empirical results, we derived analytical expressions of the critical semimajor axis beyond which the satellites would not remain stable. The expressions are given as a function of the eccentricities of the planet, eP, and of the satellite, esat. In the case of prograde satellites, the critical semimajor axis, in the units of Hill's radius, is given by aE, 0.4895 (1.0000 , 1.0305eP, 0.2738esat). In the case of retrograde satellites, it is given by aE, 0.9309 (1.0000 , 1.0764eP, 0.9812esat). We also computed the satellite stability region (aE) for a set of extrasolar planets. The results indicate that extrasolar planets in the habitable zone could harbour the Earth-like satellites. [source]

Dynamics of the TrES-2 system

ASTRONOMISCHE NACHRICHTEN, Issue 5 2009
F. Freistetter
Abstract The TrES-2 system harbors one planet which was discovered with the transit technique. In this work we investigate the dynamical behavior of possible additional, lower-mass planets. We identify the regions where such planets can move on stable orbits and show how they depend on the initial eccentricity and inclination. We find, that there are stable regions inside and outside the orbit of TrES-2b where additional, smaller planets can move. We also show that those planets can have a large orbital inclination which makes a detection with the transit technique very difficult (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]