Formation and evolution of the core

2022 ◽  
pp. 247-280
Author(s):  
Vernon F. Cormier ◽  
Michael I. Bergman ◽  
Peter L. Olson
Keyword(s):  
The Core ◽  
Formation And Evolution

scholarly journals Large-Scale Internal Magnetic Field of the Sun

1990 ◽  
Vol 138 ◽  
pp. 391-394
Author(s):  
A.E. Dudorov ◽  
V.N. Krivodubskij ◽  
A.A. Ruzmaikin ◽  
T.V. Ruzmaikina
Keyword(s):  
Magnetic Field ◽  
Differential Rotation ◽  
Large Scale ◽  
The Sun ◽  
Poloidal Magnetic Field ◽  
The Core ◽  
Torsional Waves ◽  
Formation And Evolution ◽  
Field Lines ◽  
The Magnetic Field

The behaviour of the magnetic field during the formation and evolution of the Sun is investigated. It is shown that an internal poloidal magnetic field of the order of 104 − 105 G near the core of the Sun may be compatible with differential rotation and with torsional waves, travelling along the magnetic field lines (Dudorov et al., 1989).

The role of diffusion behavior on the formation and evolution of the core‐shell structure in BaTiO 3 ‐based ceramics

2019 ◽  
Vol 103 (1) ◽  
pp. 304-314 ◽  
Author(s):  
Cheng Chen ◽  
Hua Hao ◽  
Jingjing Cui ◽  
Cong Yu ◽  
Yingfei Tang ◽  
...  
Keyword(s):  
Shell Structure ◽  
Core Shell ◽  
Diffusion Behavior ◽  
The Core ◽  
Formation And Evolution ◽  
Core Shell Structure

scholarly journals Astrometry Missions: Probing the Galaxy and Beyond

2001 ◽  
Vol 205 ◽  
pp. 469-474
Author(s):  
F. Mignard
Keyword(s):  
Star Formation ◽  
Age Determination ◽  
Deep Impact ◽  
The Core ◽  
The Galaxy ◽  
Formation And Evolution ◽  
Space Astrometry ◽  
Summary Data

In the wake of the HIPPARCOS success four highly accurate space astrometry missions are now approved for launch within the next ten years. Stellar physics and galactic physics constitute the core science of these missions with deep impact on star formation and evolution, cosmic distance scales and age determination of the oldest stars. Summary data are provided in this paper to compare the goals and capabilities of these missions.

Prebisch and Myrdal: development economics in the core and on the periphery

2011 ◽  
Vol 6 (1) ◽  
pp. 29-52 ◽  
Author(s):  
Andrés Rivarola Puntigliano ◽  
Örjan Appelqvist
Keyword(s):  
Latin America ◽  
Development Economics ◽  
International Institutions ◽  
The Core ◽  
Gunnar Myrdal ◽  
Economic Commission ◽  
Formation And Evolution ◽  
Different Origins

AbstractThe ideas on development issues of two ‘pioneers in development’, Raúl Prebisch and Gunnar Myrdal, are tracked in their formation and evolution. The central role of these two ‘defiant bureaucrats’ in the Economic Commission for Europe (ECE) and the Economic Commission for Latin America (CEPAL) are used to reflect on the interaction between intellectuals and international institutions in different historical contexts. Both men represented a liberal–universal strand in development thinking. Their divergent conclusions and assessments of the role of international institutions are compared, and are related to their different origins in core and periphery. It is argued that such roots influenced two different approaches to development problems within the UN system.

scholarly journals Is entrepreneurship an emerging area of research? A computational response

2021 ◽  
Author(s):  
Roney Fraga Souza ◽  
Rosangela Ballini ◽  
José Maria Ferreira Jardim Silveira ◽  
Aurora Amélia Castro Teixeira
Keyword(s):  
Field Research ◽  
Computational Procedure ◽  
Original Version ◽  
Citation Networks ◽  
The Core ◽  
Research Areas ◽  
Formation Method ◽  
Formation And Evolution ◽  
Direct Citation ◽  
Number Of Publications

Objective: We aim to answer four questions. First, with the increasing number of publications, is there a concentration in specific subjects, or on the contrary, a dispersion, amplifying the span of themes related to entrepreneurship? Second, is there a hierarchy of subjects, in the sense that some of them constitute the “core” of entrepreneurship? Third, are they connected with other established research areas? Finally, it is possible to identify papers that are influential, acting as hubs in the cluster’s formation? Method: We developed an original version of the computational procedure proposed by Shibata et al (2008), which allows us to understand the diversity of the different sub-areas of the topic investigated, reducing the need for specialist supervision. Originality / Relevance: We developed and applied a method to capture the formation and evolution of research areas in entrepreneurship literature, via direct citation networks, allowing us to understand the iteration between the different research sub-areas. Results: The dispersion is a feature of entrepreneurship as field research, with a hierarchy between research areas, indicating an emergent organization in the expansion processes. We concluded that research on entrepreneurship consists of specialization, that is, by application in niches.

scholarly journals In Search of a Settlement Pattern for Bengal Delta Through Theoretical Re-Interpretations

2020 ◽  
Vol 8 (1) ◽  
pp. 21-34
Author(s):  
Masud Ur Rashid
Keyword(s):  
Theoretical Analysis ◽  
Rice Cultivation ◽  
Secondary Source ◽  
Culture Studies ◽  
Bengal Delta ◽  
The Core ◽  
Core Components ◽  
Formation And Evolution ◽  
Core Issues ◽  
Source Materials

The purpose of this study based on secondary source materials is to reinterpret and classify settlementtypology that has relevance to the Bengal Delta. The theoretical analysis were used to figure out the Delta Settlement typologies and to study commonalities or core issues related to settlement formation. This desktop study together with available literature shows that many studies were carried out on the evolution of settlements and also on patterns of settlements. Globally settlements were seen to be fundamentally classified into two broad groups on the basis of their historic origin, that is, hunters and gatherers settlements and settled agricultural settlements. Among the settled agricultural pattern, there is a sub-group of wet-rice cultivation culture. Studies show that Bengal Delta typology is situated in a special thread of ‘rain-fed rice cultivation culture’ in the ‘warm-humid’ Bengal Delta region. With this textual footing, several conceptual ideas were evaluated and finally, the five principles of Doxiadis regarding the universal settlement formulation specifying the core components have been found relevant and also Mowla’s hypothesis for settlement formation in the warm humid Bengal Delta has been found to be of relevance to explain the formation and evolution of the settlements model of the Bengal Delta found through the historic interpretation of old documents and subsequent studies.

scholarly journals Disc formation in magnetized dense cores with turbulence and ambipolar diffusion

2019 ◽  
Vol 489 (4) ◽  
pp. 5326-5347 ◽  
Author(s):  
Ka Ho Lam ◽  
Zhi-Yun Li ◽  
Che-Yu Chen ◽  
Kengo Tomida ◽  
Bo Zhao
Keyword(s):  
Ambipolar Diffusion ◽  
Accretion Flow ◽  
The Core ◽  
Dense Cores ◽  
Formation And Evolution ◽  
Field Lines ◽  
Cloud Cores ◽  
Magnetohydrodynamic Simulations ◽  
Initial Turbulence ◽  
Disc Formation

ABSTRACT Discs are essential to the formation of both stars and planets, but how they form in magnetized molecular cloud cores remains debated. This work focuses on how the disc formation is affected by turbulence and ambipolar diffusion (AD), both separately and in combination, with an emphasis on the protostellar mass accretion phase of star formation. We find that a relatively strong, sonic turbulence on the core scale strongly warps but does not completely disrupt the well-known magnetically induced flattened pseudo-disc that dominates the inner protostellar accretion flow in the laminar case, in agreement with previous work. The turbulence enables the formation of a relatively large disc at early times with or without AD, but such a disc remains strongly magnetized and does not persist to the end of our simulation unless a relatively strong AD is also present. The AD-enabled discs in laminar simulations tend to fragment gravitationally. The disc fragmentation is suppressed by initial turbulence. The AD facilitates the disc formation and survival by reducing the field strength in the circumstellar region through magnetic flux redistribution and by making the field lines there less pinched azimuthally, especially at late times. We conclude that turbulence and AD complement each other in promoting disc formation. The discs formed in our simulations inherit a rather strong magnetic field from its parental core, with a typical plasma-β of order a few tens or smaller, which is 2–3 orders of magnitude lower than the values commonly adopted in magnetohydrodynamic simulations of protoplanetary discs. To resolve this potential tension, longer term simulations of disc formation and evolution with increasingly more realistic physics are needed.

scholarly journals Formation and evolution of black hole and accretion disk in collapse of massive stellar cores

2011 ◽  
Vol 7 (S279) ◽  
pp. 305-308
Author(s):  
Yuichiro Sekiguchi
Keyword(s):  
Shock Wave ◽  
General Relativity ◽  
Black Hole ◽  
Neutron Star ◽  
Kinetic Energy ◽  
Initial Condition ◽  
The Core ◽  
Torus Surface ◽  
Formation And Evolution ◽  
Temperature Equation

AbstractWe describe the results of our numerical simulations of the collapse of a massive stellar core to a BH, performed in the framework of full general relativity incorporating finite-temperature equation of state and neutrino cooling. We adopt a 100 M⊙ presupernova model calculated by Umeda & Nomoto (2008), which has a massive core with a high value of entropy per baryon. Changing the degree of rotation for the initial condition, we clarify the dependence of the outcome on this. When the rotation is rapid enough, the shock wave formed at the core bounce is deformed to be a torus-like shape. Then, the infalling matter is accumulated in the central region due to the oblique shock at the torus surface, hitting the hypermassive neutron star (HMNS) and dissipating the kinetic energy there. As a result, outflows can be launched. The HMNS eventually collapses to a BH and an accretion torus is formed around it. We also found that the evolution of the BH and torus depends strongly on the rotation initially given.

What face familiarity feelings say about the lateralization of specific entities within the core system

2019 ◽  
Vol 42 ◽  
Author(s):  
Guido Gainotti
Keyword(s):  
Temporal Lobe ◽  
Memory System ◽  
Core System ◽  
The Core ◽  
Memory Traces ◽  
Specific Memory ◽  
Target Article ◽  
Temporal Structures ◽  
The Right

Abstract The target article carefully describes the memory system, centered on the temporal lobe that builds specific memory traces. It does not, however, mention the laterality effects that exist within this system. This commentary briefly surveys evidence showing that clear asymmetries exist within the temporal lobe structures subserving the core system and that the right temporal structures mainly underpin face familiarity feelings.

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