EXISTENCE AND POSITIVITY RESULTS FOR THE φ−θ AND A MODIFIED k−ε TWO-EQUATIONTURBULENCE MODELS

1993 ◽  
Vol 03 (02) ◽  
pp. 195-215 ◽  
Author(s):  
ROGER LEWANDOWSKI ◽  
BIJAN MOHAMMADI

In this work, we consider the k−ε two-equation turbulence model from the point of view of mathematical and numerical analysis. We introduce a new equivalent two-equation model based on a new set of variables. In the first part, we study this model with a constant eddy viscosity. In this model, the coupling between the equations is done only through the right-hand side. In the second part, we consider the complete model with a nonlinear viscosity. Finally, the impact of this new change of variables on the numerical computations with the k−ε model is shown and a robust algorithm which preserves the positivity of the variables is given.

2021 ◽  
Vol 13 (16) ◽  
pp. 9249
Author(s):  
Nosheena Yasir ◽  
Nasir Mahmood ◽  
Hafiz Shakir Mehmood ◽  
Osama Rashid ◽  
An Liren

Intentions have been described as a key driver of sustainable entrepreneurial opportunity recognition and eventually activity. As a result of this study, interest may increase in entrepreneurship intentions across numerous entrepreneurial levels and styles, specifically from the point of view of sustainability. However, research to date has not been able to completely determine how the intrinsic complications of instantaneously producing social, environmental, and economic means will have an impact on the intentions of university students. This study sought to inspect the impact of self-transcending and self-enhancing value on the advent of intentions. The theory of planned behavior is an adaptive theory that this study quantitatively analyzed using a structural equation model and survey data from 577 university students in Punjab, Pakistan. The empirical findings show that altruistic, biospheric, hedonic, and egoistic values all have an indirect effect on sustainability-driven entrepreneurial intentions, which is important to understand when assessing attitudes toward sustainable entrepreneurship and perceived behavior control. In essence, attitudes, perceived behavior, and social norms all affect aspirations to become a sustainable entrepreneur. In real-world terms, the findings indicate that by using value activation techniques to increase attitudes and educational interest, practitioners may promote sustainable entrepreneurial intentions. It is also suggested how government services could be improved as part of the strategy.


2012 ◽  
Vol 48 (3) ◽  
Author(s):  
Soheil Sibdari ◽  
Mansoureh Jeihani

This paper shows how tolling (or pricing) strategies can be used to control the congestion levels of both untolled and high occupancy toll (HOT) lanes. Using a user-equilibrium method, the paper calculates the number of travelers on each route during the peak period and provides a numerical analysis that determines the distribution of travelers for different tolling strategies. It shows that with the right tolling strategy some travelers who initially plan to use the untolled lane during the peak period will change both their routes (i.e., select the HOT lane) and departure times (i.e., depart earlier or later). Using this result, the paper compares static and dynamic pricing strategies and shows that with a dynamic strategy a larger profit can be earned and congestion reduced in the untolled lane.


Plants ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 703 ◽  
Author(s):  
Gerardo Carrera-Castaño ◽  
Julián Calleja-Cabrera ◽  
Mónica Pernas ◽  
Luis Gómez ◽  
Luis Oñate-Sánchez

The ability of a seed to germinate and establish a plant at the right time of year is of vital importance from an ecological and economical point of view. Due to the fragility of these early growth stages, their swiftness and robustness will impact later developmental stages and crop yield. These traits are modulated by a continuous interaction between the genetic makeup of the plant and the environment from seed production to germination stages. In this review, we have summarized the established knowledge on the control of seed germination from a molecular and a genetic perspective. This serves as a “backbone” to integrate the latest developments in the field. These include the link of germination to events occurring in the mother plant influenced by the environment, the impact of changes in the chromatin landscape, the discovery of new players and new insights related to well-known master regulators. Finally, results from recent studies on hormone transport, signaling, and biophysical and mechanical tissue properties are underscoring the relevance of tissue-specific regulation and the interplay of signals in this crucial developmental process.


2020 ◽  
Vol 6 (3) ◽  
pp. 109-114
Author(s):  
Ekaterina A. Koroleva

The article deals with the main provisions of Richard Posners book How judges think, which is, according to the authors own assessment, an attempt by an American scientist to understand the motives that guide judges in making judgments. The emphasis Posner puts on psychology leads to the fact that the book gives the right to talk about how judges think, not about judicial behavior: considering traits, temperament, race and gender, as well as personal and professional experience. From all the above Richard Posner concludes that judges are guided by the rationality of actions and decisions. Therefore, special attention in this article is paid to the concept of rationality from the point of view of Posner himself, as well as the assessment of this concept from the point of view of Russian scientists V.L. Tambovtsev and L.V. Smorgunov, since this concept of rational choice reveals the essence of economic analysis of law. Special attention should be paid to the argument that according to Richard Posner, rational choice does not have to be without error in the conditions of lack of information or the complexity of its collection and analysis. The arguments of Henry Beckett, as one of the founders of the economic analysis of law, on rationality in the Commission of an offense are given. Also, the article considers the facts that allow to state that at present the economic analysis of the law has gone far beyond the initial attention to Antimonopoly regulation, taxation, regulation of public utilities, corporate Finance and other usual areas of economic regulation, the range of issues that can be resolved through economic analysis of the law is much wider and more diverse. According to the results of races-judgements and the estimation of economic analysis of law and the category of rationality in the legal field.


2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Ketan Atulkumar Ganatra ◽  
Dushyant Singh

The numerical analysis for the round jet impingement over a circular cylinder has been carried out. The v2f turbulence model is used for the numerical analysis and compared with the two equation turbulence models from the fluid flow and the heat transfer point of view. Further, the numerical results for the heat transfer with original and modified v2f turbulence model are compared with the experimental results. The nozzle is placed orthogonally to the target surface (heated cylindrical surface). The flow is assumed as the steady, incompressible, three-dimensional and turbulent. The spacing between the nozzle exit and the target surface ranges from 4 to 15 times the nozzle diameter. The Reynolds number based on the nozzle diameter ranges from 23,000 to 38,800. From the heat transfer results, the modified v2f turbulence model is better as compared to the other turbulence models. The modified v2f turbulence model has the least error for the numerical Nusselt number at the stagnation point and wall jet region.


10.12737/2241 ◽  
2014 ◽  
Vol 2 (2) ◽  
pp. 68-79
Author(s):  
Олег Шерстобоев ◽  
Oleg Sherstoboev

Proper judicial protection is an aggregate of legal norms, principles, doctrines that allow maximum guarantee for fair treatment of an administrative dispute, in particular, relating to expulsion of foreign nationals. Among basic means that guarantee a proper settlement of a dispute, one can name the right to appeal the act of public administration, the right to independence of a body, considering the case, the right to qualified legal assistance, competition, completeness of supervision. The author of the article reviews standings of the European Court of Human Rights, as well as the legislation and practice of the USA, Great Britain, Germany and Russia on the issue of judicial protection of foreign nationals, deported from their territory. As a result of the analysis, the author outlines three models of the provided judicial protection: limited, selective and complete. Each model has its pluses and minuses, but from a theoretical point of view the best variant is a complete model of judicial protection.


2020 ◽  
Vol 14 ◽  
Author(s):  
Oprescu Georgiana

The approaches considered by the authorities, generally enforced, during the “Covid 19” pandemic regarding the state of national and international tourism have been characterised as excessive and controversial not only from an economical point of view but as well as from a cultural and functional one, and they must be analysed from a sociological perspective. The shortage of medical, organisational and human resources, the lack of mental preparation of medical workers but as well as that of the population in terms of preventing massive losses led to the rapid destruction of what we used to call tourism. From a sociological perspective the world-wide blockage was mainly caused by the superficiality of the prevention methods adopted and by their radicality that blocked the entire economy. By this article I try to approach from a from a sociological point of view the “pandemic” effects that that have influenced and are still influencing tourism. In extenso, the plethora of factors like public transportation, hospitals, workplace and so on have provoked the rapid spread of COVID-19 virus and the impact was ravaging for the hospitality industry due to the fact that the client in his role of tourist received only negative signal, signals of fear and uncertainty. The controversies regarding different fields of national and international tourism are various in number, but the present interest lies in COVID-19 virus and a consequence of this plague is the foreclosure as opposed to the fact that by imposing the right measurements and by protecting this field in a composed way without letting panic to reach the population it would have been possible to at least mentain a constant level of activity in tourism and as a consequence a steady national and international economy. Furthermore, I want to issue the assumption that if there would have been a propper crisis-management on a national level, even on international one, a partnership between the government and the private sector, meaningfull aid coming from government towards the people, employees, antreprenours, elders, lower-class families, private inverstors, not only that from an economical point of view tourism could be saved but also a “positive aura” could have been built in the psyche of the individuals and that would have helped them to have a diffrent type of confinment. For excample, a 10 days stay in a highly reviewed an alternative method - provocative, peacefull and safe- but to acomplish this the hoteliere should revise the concept on which a touritic package is built (by offering services as therapy, medical check-up and so on). The motto of the new concept could be the old saying “A healthy mind in a healthy body“ -”Mens sana in corpore sano” in this way the panic, fear and seclusion could be replaced with cultural work and the right to mental wellness with the help ground-braking touristic offers. From a sociological perspective, in order to have a healthy mind in a healthy body or in order to strengthen our immune system, we, the ones that form the contemporary society should exploit outdoor activities, relaxation time, travelling, living, all this leading to the reinforcement of tourism


2021 ◽  
Vol 7 (2) ◽  
pp. 48-56
Author(s):  
T. V. Klenova

The article is devoted to the institution of criminal liability for attacks on the honor and dignity of the individual. The article, using the historical method, examines the stages of development of this institution and the features of protecting the honor and dignity of the individual from the point of view of the values of a modern democratic state. The author analyses the impact of explicit and implicit criminal policy objectives on the ways to protect the honor and dignity of the individual. Particular attention is paid to the criminalization and decriminalization of libel and slander. The research is aimed at identifying the problems of targeting in changes in the institution of criminal liability for attacks on honor and dignity, when the relevant criminal law norms are replaced by administrative law norms. The author seeks to depoliticize the protection of the personal right to honor and dignity on the basis of the principle of equality of citizens before the law. The current Russian criminal legislation is mainly aimed at protecting the honor and dignity of persons in connection with their social accessories. Within the protective concept of criminal law, the author of the article justifies the conclusion that the right of anyone who has suffered from slander or insult to achieve the truth and state censure of the perpetrator is guaranteed. Such a view will also be interesting to researchers of the criminal process.


2019 ◽  
Vol 11 (11) ◽  
pp. 31-43
Author(s):  
Fredy Andrés Cruz - Vega ◽  
Luz Eliana Figueroa - Granados

The research makes it possible to recognize the judgments of the users who are enrolled in the zero to always family modality and, in turn, establish the relationship they give to the program in the training of their children. The use of qualitative research for this proposal contributes or it establishes the relationship of describing and giving points of view to problems of the social educational and experiential context, the primary objective was to determine the degree of use by users of the program from zero to always family modality, in the municipality of Pamplona. It can be said that the application of this research contributes in part to diagnosing from a personal point of view the impact generated by the program in the training of minors, evidencing in it the theoretical, political and real positions in order to make them aware of the importance of training of children. The instruments used for families in certain rural areas who are the objects of study were semi-structured interviews; validated by experts from the area, they managed to produce key information for the analysis and triangulation. Thanks to the analysis units and the categories established in the interview, it was possible to focus and provide solutions to the objectives set, demonstrating the perception that the beneficiaries of the program of zero They always have in relation to the operation in rural areas of Pamplona. With the information obtained it is clear to establish the conformity of the operation of the program in terms of the role of care for families, the training of minors and the integration of society is thus how the show is getting on the right tide.


2018 ◽  
Vol 26 (5) ◽  
pp. 1473-1483 ◽  
Author(s):  
Kayoko Ohnishi ◽  
Kazuyo Kitaoka ◽  
Jun Nakahara ◽  
Maritta Välimäki ◽  
Raija Kontio ◽  
...  

Background: Moral distress occurs when one knows the right thing to do, but institutional constraints make it nearly impossible to pursue the right course of action. Moral distress was found to cause negative feelings, burnout, and/or resignation. Not only external factors such as lack of staff but also internal ones affect moral distress. Moral sensitivity, which is thought of as an advantage of nurses, could effect moral distress, as nurses being unaware of existing ethical problems must feel little distress. Objectives: To examine the impact of moral sensitivity on moral distress among psychiatric nurses, and affirm the hypothesis that nurses with higher moral sensitivity will suffer moral distress more than nurses with less moral sensitivity in two different samples. Ethical consideration: The study obtained ethical approval from the Research Ethics Committee of the Faculty of Medicine at Mie University (# 1111, 20.4.2010), and by the Turku University Ethics Board (29.5.2012). Permissions to undertake the study was obtained from the in two hospital districts and in one city (§ 48/4.10.2012, § 63/4.9.2012, 51/2012 27.8.2012). Informed consent was not formally obtained, because the questionnaire was anonymously reported by the participants who volunteered to answer. The participants responded voluntarily and anonymously. Methods: An anonymous questionnaire containing the Revised Moral Sensitivity Questionnaire and the Moral Distress Scale for Psychiatric nurses was conducted to 997 nurses in 12 hospitals in Japan, and 974 nurses in 10 hospitals in Finland after obtaining of approval by research ethics committees. Data were analyzed using a multi-group structural equation model analysis. Findings: A set of analyses imply that the association of moral sensitivity with moral distress is significant and similar between Japan and Finland, whereas the factor structures of moral sensitivity and moral distress may be partially different. Discussion: The result of this study may indicate that nurses with high moral sensitivity can sense and identify moral problems, but not resolve them. Therefore, supporting nurses to solve ethical problems, not benumbing them, can be important for better nursing care and prevention of nurses’ resignation. Conclusion: Moral sensitivity and moral distress were positively correlated among psychiatric nurses in both Japan and Finland, although the participating nurses from the two countries were different in qualification, age, and cultural background. Nurses with high moral sensitivity suffer from moral distress.


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