scholarly journals The Role of Binaries in Cluster Dynamics

1974 ◽  
Vol 62 ◽  
pp. 225-229 ◽  
Author(s):  
D. C. Heggie
Keyword(s):  
Mass Spectrum ◽  
Empirical Evidence ◽  
Computer Simulations ◽  
Binary Stars ◽  
Star Clusters ◽  
Numerical Techniques

There is considerable empirical evidence on the behaviour of binary stars in computer simulations of isolated star clusters. Even when there are no binaries initially they form quickly if the mass spectrum of the stars is reasonably realistic. These phenomena are discussed by a combination of analytical and numerical techniques.

Research Programs at the Carter Observatory: An Overview

1996 ◽  
Vol 13 (2) ◽  
pp. 162-164
Author(s):  
R. J. Dodd ◽  
W. Orchiston
Keyword(s):  
Binary Stars ◽  
Star Clusters ◽  
Variable Stars ◽  
Photometric System ◽  
Clusters Of Galaxies ◽  
Standard Star ◽  
Main Research ◽  
Research Programs ◽  
History Of

AbstractAn outline is given of the main research programs currently in progress at the Carter Observatory. These include: the establishment of a set of standard star magnitudes and colours in the Vilnius seven-colour photometric system; the study of galactic and extragalactic star clusters using Vilnius and broadband photometries; binary stars and the development of APTs; and the history of Australasian astronomy. The role of Carter Observatory Honorary Research Associates is described and mention is made of the joint New Zealand/Japan program to observe gravitational microlensing effects, discover variable stars and patrol selected clusters of galaxies for supernovae.

scholarly journals The Gravitational Million-Body Problem

2003 ◽  
Vol 208 ◽  
pp. 81-92
Author(s):  
Douglas C. Heggie
Keyword(s):  
Binary Stars ◽  
Globular Clusters ◽  
Body Problem ◽  
Star Clusters ◽  
Stellar Dynamics ◽  
Star Cluster ◽  
Approximate Methods ◽  
Tidal Tails

We review what has been learned recently using N-body simulations about the evolution of globular clusters. While simulations of star clusters have become more realistic, and now include the evolution of single and binary stars, the prospect of reaching large enough N is still a distant one. Nevertheless more restricted kinds of simulations have recently brought valuable progress for certain problems of current observational interest, including the origin and structure of tidal tails of globular clusters. In addition, such simulations have forced us to rethink some basic aspects of stellar dynamics, including, in particular, the process of escape. Finally we turn to faster, approximate methods for studying star cluster dynamics, where the role of N-body simulations is one of calibration.

Membangun Fondasi Keilmuan Ekonomi Islam: Telaah Metodologi Muhammad Akram Khan

2017 ◽  
Vol 1 (2) ◽  
pp. 152-170
Author(s):  
Ahmad Ubaidillah
Keyword(s):  
General Theory ◽  
Empirical Evidence ◽  
Inductive Method ◽  
Ethical Values ◽  
Institutional Conditions ◽  
Faith Based ◽  
Behavioral Parameters ◽  
Science Methodology ◽  
Islamic Society

Throughout my experience in tracking down and reading books on faith-based economics, in this case Islam, there are no books that specifically list the title of "Islamic economics". If there is, it is only initiated or introduced. Most books coming down to us still use the titles starting with the word, for example, system, concept, principle, or the doctrine of Islamic economics. Why do the authors of the book Islamic economics seem not dared to give his book title with label "science"? I presume that Islamic economics has not been considered as a science. In building a science, methodology is required. Islamic Economics also requires a well-established methodology to build the foundation of science. The study answers questions; how is methodology which is offered by Muhammad Akram Khan to build Islamic economics. The method used in this research is the study of literature with qualitative approach.The result of study concludes that Khan offers methodology of Islamic economics, if summarized, written as follows: First, Islamic economics uses a framework derived from the texts of divinity (revelation). Second, Islamic economics uses the inductive method, which gives witness to the truth or falsity assumptions and predictions about the two criteria of rationality and empirical evidence. Third, Islamic economy is built on ethical values ​​such as justice, virtue, moderation, sacrifice, caring for others, in the analysis, as behavioral parameters. Fourth, Islamic economics is a normative discipline. Islamic Economics investigates ways and means to change the existing economy with Islamic economy. Fifth, Islamic economics ask different questions with conventional economics. Its attention is on welfare (falah) human and creating social and institutional conditions that maximize falah in society. Clearly, Islamic economics strongly supports research programs that help maximize falah. Furthermore, Khan elaborates several issues related to the methodology that often appears in the forum of Islamic economists. There are some problems that Khan proposes, they are the interaction with modern economics, the role of revelation, assuming ideal Islamic society, and the general theory of Islamic economics.

Hostility to Hospitality: Authors’ Response

2020 ◽  
Vol 9 (2) ◽  
pp. 149-152
Author(s):  
Michael J. Balboni
Keyword(s):  
Pastoral Care ◽  
Empirical Evidence ◽  
Spiritual Care ◽  
Religious Communities ◽  
Holistic Care ◽  
Social Forces ◽  
Medical Institutions ◽  
Body And Soul ◽  
Constructive Criticism

AbstractThis article offers a brief response to constructive criticism of the book featured in this edition of Spiritual Care. Hostility to Hospitality argues that the role of spirituality within the care of sick patients, despite clear empirical evidence demonstrating its importance, remains deeply contested because of bias against religious communities. Deeply flawed conceptualizations of the nature of religion and the secular camouflage how a society's commitment to immanence functions like a spirituality. A secular framework weakens how spiritual communities can positively influence medical institutions or socialize professional guilds in caring for the whole patient. The diminishment of communities that champion compassion as a chief end, pave a way for hostile economic, technological, and bureaucratic forces to suppress our ability to fully care for patients in body and soul. Rather than being neutral as purported, the secular structures of medicine manipulate and use pastoral care for its own immanent ends. Hostility to Hospitality argues that unless pluralism is embraced, allowing for a diversity of religious communities to influence the structures of medicine, compassionate and holistic care will increasingly become unlikely as impersonal social forces increase.

scholarly journals The Merger Rate of Black Holes in a Primordial Black Hole Cluster

Physics ◽  
2021 ◽  
Vol 3 (2) ◽  
pp. 372-378
Author(s):  
Viktor D. Stasenko ◽  
Alexander A. Kirillov
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Mass Spectrum ◽  
Star Clusters ◽  
Primordial Black Hole ◽  
Primordial Black Holes ◽  
Central Black Hole ◽  
Solar Mass ◽  
Merger Rate

In this paper, the merger rate of black holes in a cluster of primordial black holes (PBHs) is investigated. The clusters have characteristics close to those of typical globular star clusters. A cluster that has a wide mass spectrum ranging from 10−2 to 10M⊙ (Solar mass) and contains a massive central black hole of the mass M•=103M⊙ is considered. It is shown that in the process of the evolution of cluster, the merger rate changed significantly, and by now, the PBH clusters have passed the stage of active merging of the black holes inside them.

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