scholarly journals Effects of Dispersal for a Logistic Growth Population in Random Environments

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Xiaoling Zou ◽  
Dejun Fan ◽  
Ke Wang
Keyword(s):  
Stationary Distribution ◽  
Logistic Model ◽  
Numerical Experiments ◽  
Random Environments ◽  
Logistic Growth ◽  
Small Diffusion ◽  
Stochastic Logistic Model ◽  
Diffusion Rates ◽  
Definition Of ◽  
Do So

We study a stochastic logistic model with diffusion between two patches in this paper. Using the definition of stationary distribution, we discuss the effect of dispersal in detail. If the species are able to have nontrivial stationary distributions when the patches are isolated, then they continue to do so for small diffusion rates. In addition, we use some examples and numerical experiments to reflect that diffusions are capable of both stabilizing and destabilizing a given ecosystem.

scholarly journals A product form for the general stochastic matching model

2021 ◽  
Vol 58 (2) ◽  
pp. 449-468
Author(s):  
Pascal Moyal ◽  
Ana Bušić ◽  
Jean Mairesse
Keyword(s):  
Stationary Distribution ◽  
Product Form ◽  
Necessary Condition ◽  
Matching Model ◽  
Bipartite Matching ◽  
Compatibility Graph ◽  
Stochastic Matching ◽  
Dynamic Reversibility ◽  
Original Dynamic ◽  
Do So

AbstractWe consider a stochastic matching model with a general compatibility graph, as introduced by Mairesse and Moyal (2016). We show that the natural necessary condition of stability of the system is also sufficient for the natural ‘first-come, first-matched’ matching policy. To do so, we derive the stationary distribution under a remarkable product form, by using an original dynamic reversibility property related to that of Adan, Bušić, Mairesse, and Weiss (2018) for the bipartite matching model.

scholarly journals Accountability as a Virtue

2021 ◽  
pp. 095394682110097
Author(s):  
Andrew Torrance
Keyword(s):  
Definition Of ◽  
Do So

This opening article will offer a brief introduction to what it means to understand accountability as a virtue. To do so, I first propose a definition of the condition of accountability, which I go on to distinguish from responsibility. Based on this definition, I then present an account of the corresponding virtue of accountability.

scholarly journals Indistinguishability and Negative Probabilities

Entropy ◽  
2020 ◽  
Vol 22 (8) ◽  
pp. 829
Author(s):  
J. Acacio de Barros ◽  
Federico Holik
Keyword(s):  
Quantum Systems ◽  
Quantum Contextuality ◽  
No Signaling ◽  
Definition Of ◽  
Do So

In this paper, we examined the connection between quantum systems’ indistinguishability and signed (or negative) probabilities. We do so by first introducing a measure-theoretic definition of signed probabilities inspired by research in quantum contextuality. We then argue that ontological indistinguishability leads to the no-signaling condition and negative probabilities.

New code for the protection of civilian population and property during armed conflict

1980 ◽  
Vol 20 (219) ◽  
pp. 287-315 ◽  
Author(s):  
Ionel Gloşcă
Keyword(s):  
International Law ◽  
Armed Conflict ◽  
Armed Conflicts ◽  
International Treaties ◽  
Civilian Population ◽  
State Activity ◽  
The Holocaust ◽  
Definition Of ◽  
Do So

One of the principles underlying international law applicable in armed conflicts is that no act of war is permitted against the civilian population, consisting, by definition, of persons who take no part in the hostilities.Until the holocaust of 1939–45, international law gave practically no real protection to the civilian population in the event of war, and was not even intended to do so since up to that time war was considered to be a State activity from which civilians remained aloof. There were, nonetheless, general principles and rules in various international treaties which, in one way or another, related also to the civilian population.

Toxæmia in the Etiology of Mental Disease. a Discussion opened

1902 ◽  
Vol 48 (202) ◽  
pp. 434-450 ◽  
Author(s):  
T. S. Clouston
Keyword(s):  
Nerve Cell ◽  
General Trend ◽  
Mental Disease ◽  
The Other ◽  
British Association ◽  
Younger Men ◽  
Full Knowledge ◽  
The Subject ◽  
Definition Of ◽  
Do So

Dr. Clouston said that when he suggested toxæmia to the secretary as a suitable subject for a discussion at this meeting he had not intended to be the first speaker, because his object was to bring out more fully the views of the younger members who had recently committed themselves so strongly to the toxæmic and bacterial etiology of insanity, and so to get light thrown on some of the difficulties which he and others had felt in applying this theory to many of their cases in practice. It was not that he did not believe in the toxic theory as explaining the onset of many cases, or that he under-rated its importance, but that he could not see how it applied so universally or generally as some of the modern pathological school were now inclined to insist on. He knew that it was difficult for those of the older psychological and clinical school to approach the subject with that full knowledge of recent bacteriological and pathological doctrine which the younger men possessed, or to breathe that all-pervading pathological atmosphere which they seemed to inhale. He desired to conduct this discussion in an absolutely non-controversial and purely scientific spirit. To do so he thought it best to put his facts, objections, and difficulties in a series of propositions which could be answered and explained by the other side. He thought it important to define toxæmia, but should be willing to accept Dr. Ford Robertson's definition of toxines, viz., “Substances which are taken up by the (cortical nerve) cell and then disorder its metabolism.” He took the following extracts from his address at the Cheltenham meeting of the British Association (1) as representing Dr. Ford Robertson's views and the general trend of much investigation and hypothesis on the Continent.

scholarly journals O novo paradigma da decisão a partir do art. 20 da LINDB: análise do dispositivo segundo as teorias de Richard Posner e Neil MacCormick

2019 ◽  
Vol 278 (3) ◽  
pp. 113
Author(s):  
Francisco Sérgio Maia Alves
Keyword(s):  
Legal Practice ◽  
New Paradigm ◽  
The Law ◽  
Definition Of ◽  
Do So

<p>The new paradigm of decision based on art. 20 of the LINDB: analysis of the text according to the theories of Richard Posner and Neil MacCormick</p><p> </p><p>O presente trabalho visa analisar o art. 20 da Lei de Introdução às Normas do Direito Brasileiro (LINDB), introduzido pela Lei nº 13.655/2018. Para tanto, será mostrado como os valores jurídicos foram excluídos e novamente reintroduzidos na prática jurídica e como essa reintrodução gerou preocupações quanto ao aumento da discricionariedade da aplicação do direito. O artigo apresentará as teorias pragmática e consequencialista, segundo a doutrina de dois de seus principais expoentes, Richard Posner e Neil MacCormick. No afã de cumprir o objetivo central do artigo, serão delimitados os conceitos de valores jurídicos abstratos e consequências práticas da decisão, no contexto do art. 20 da LINDB, e, por fim, definido o espaço de aplicação do dispositivo.</p><p> </p><p>This work aims to analyze art. 20 of the Law of Introduction to the Rules of Brazilian Law (LINDB), or Law No. 13.655/2018. To do so, it will be shown how legal values were excluded and reintroduced in legal practice and how this reintroduction raised concerns regarding the increase of discretion in the application of the law. The article will present pragmatic and consequentialist theories, in line with the doctrine of two of its main exponents, Richard Posner and Neil MacCormick. In order to meet the key objective of the article, the concepts of abstract legal values and practical consequences of the decision will be described in the context of art. 20 of the LINDB, concluding with a definition of the area in which the law is applied.</p>

scholarly journals Forecasting COVID-19 cases in Algeria using logistic growth and polynomial regression models

2021 ◽  
Author(s):  
Mohamed LOUNIS ◽  
Babu Malavika
Keyword(s):  
Regression Model ◽  
Logistic Model ◽  
Polynomial Regression ◽  
Logistic Growth ◽  
The Novel ◽  
Logistic Growth Model ◽  
Polynomial Regression Models ◽  
Using Data ◽  
Novel Coronavirus ◽  
Polynomial Regression Model

Abstract The novel Coronavirus respiratory disease 2019 (COVID-19) is still expanding through the world since it started in Wuhan (China) on December 2019 reporting a number of more than 84.4 millions cases and 1.8 millions deaths on January 3rd 2021.In this work and to forecast the COVID-19 cases in Algeria, we used two models: the logistic growth model and the polynomial regression model using data of COVID-19 cases reported by the Algerian ministry of health from February 25th to December 2nd, 2020. Results showed that the polynomial regression model fitted better the data of COVID-19 in Algeria the Logistic model. The first model estimated the number of cases on January, 19th 2021 at 387673 cases. This model could help the Algerian authorities in the fighting against this disease.

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