scholarly journals A fully general, non-perturbative treatment of impulsive heating

2021 ◽  
Vol 502 (1) ◽  
pp. 1441-1455
Author(s):  
Uddipan Banik ◽  
Frank C van den Bosch
Keyword(s):  
Impact Parameter ◽  
Equal Mass ◽  
Astrophysical Objects ◽  
The Subject ◽  
Impulsive Heating ◽  
The Moment ◽  
Quadrupole Term ◽  
The Impact ◽  
Analytical Expressions ◽  
Perturbative Treatment

ABSTRACT Impulsive encounters between astrophysical objects are usually treated using the distant tide approximation (DTA) for which the impact parameter, b, is assumed to be significantly larger than the characteristic radii of the subject, rS, and the perturber, rP. The perturber potential is then expanded as a multipole series and truncated at the quadrupole term. When the perturber is more extended than the subject, this standard approach can be extended to the case where rS ≪ b < rP. However, for encounters with b of order rS or smaller, the DTA typically overpredicts the impulse, Δv, and hence the internal energy change of the subject, ΔEint. This is unfortunate, as these close encounters are the most interesting, potentially leading to tidal capture, mass stripping, or tidal disruption. Another drawback of the DTA is that ΔEint is proportional to the moment of inertia, which diverges unless the subject is truncated or has a density profile that falls off faster than r−5. To overcome these shortcomings, this paper presents a fully general, non-perturbative treatment of impulsive encounters which is valid for any impact parameter, and not hampered by divergence issues, thereby negating the necessity to truncate the subject. We present analytical expressions for Δv for a variety of perturber profiles, apply our formalism to both straight-path encounters and eccentric orbits, and discuss the mass-loss due to tidal shocks in gravitational encounters between equal-mass galaxies.

Social capital in the theory and research of LIS professionals in the light of the literature on the subject. Review of current knowledge

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Maja Dorota Wojciechowska
Keyword(s):  
Social Capital ◽  
Current Knowledge ◽  
Future Research ◽  
Content Type ◽  
Individual Social Capital ◽  
Rural Libraries ◽  
The Subject ◽  
The Moment ◽  
The Impact

Purpose The purpose of the paper is to present the latest scholarly trends in the field of social capital in libraries, to review research concepts published by LIS professionals and to suggest further research possibilities in this area. Design/methodology/approach This paper presents a review and critical analysis of literature associated with research on social capital in libraries to highlight its importance for the development of LIS and its impact on the functioning of environments linked with various types of libraries. The goal of literature analysis was to determine the current condition of research on social capital in libraries. The main trends were identified and the need for further qualitative analyses, which are missing at the moment, was confirmed. Findings It was determined that, so far, LIS professionals have focussed mainly on the role of municipal libraries in developing social capital, the problem of building trust, especially in immigrant circles and the impact of libraries on promoting a civil society. Academic libraries, rural libraries, organisational capital in libraries and individual social capital of librarians were a much less frequent subject of research. The role of libraries in developing social capital in educational (primary and secondary education) and professional (non-university professionals) circles is practically non-existent in research, and it will require in-depth studies and analyses in the coming years. Originality/value This paper constitutes a synthetic review of the latest research concepts concerning social capital in libraries. It identifies the most important research trends and areas that so far have not been explored and suggests research methods to help LIS professionals design future research in this area more effectively.

scholarly journals Is There a Link between Oropharyngeal Microbiome and Schizophrenia? A Narrative Review

2022 ◽  
Vol 23 (2) ◽  
pp. 846
Author(s):  
Stanislas Martin ◽  
Audrey Foulon ◽  
Wissam El Hage ◽  
Diane Dufour-Rainfray ◽  
Frédéric Denis
Keyword(s):  
Periodontal Disease ◽  
Research Team ◽  
Oral Microbiome ◽  
Oral Microbiota ◽  
Future Studies ◽  
The Subject ◽  
The Moment ◽  
The Impact ◽  
The Brain

The study aimed to examine the impact of the oropharyngeal microbiome in the pathophysiology of schizophrenia and to clarify whether there might be a bidirectional link between the oral microbiota and the brain in a context of dysbiosis-related neuroinflammation. We selected nine articles including three systemic reviews with several articles from the same research team. Different themes emerged, which we grouped into 5 distinct parts concerning the oropharyngeal phageome, the oropharyngeal microbiome, the salivary microbiome and periodontal disease potentially associated with schizophrenia, and the impact of drugs on the microbiome and schizophrenia. We pointed out the presence of phageoma in patients suffering from schizophrenia and that periodontal disease reinforces the role of inflammation in the pathophysiology of schizophrenia. Moreover, saliva could be an interesting substrate to characterize the different stages of schizophrenia. However, the few studies we have on the subject are limited in scope, and some of them are the work of a single team. At this stage of knowledge, it is difficult to conclude on the existence of a bidirectional link between the brain and the oral microbiome. Future studies on the subject will clarify these questions that for the moment remain unresolved.

The Wages of Blackness

Jah Kingdom ◽  
2017 ◽  
Author(s):  
Monique A. Bedasse
Keyword(s):  
Political Campaigns ◽  
Pan African ◽  
Pan Africanism ◽  
History Of ◽  
Independent States ◽  
The Subject ◽  
The Moment ◽  
The Right ◽  
The Impact ◽  
Newly Independent States

When Rastafarians began to petition the Tanzanian government for the “right of entry” in 1976, they benefitted from a history of linkages between Jamaica and Tanzania, facilitated largely by the personal and political friendship between Julius Nyerere and Prime Minister of Jamaica, Michael Manley. This is the subject of the third chapter, which provides essential context for the repatriation. The chapter begins by unearthing the pan-African politics of Michael Manley, which he constructed after appropriating Rastafarian symbols and consciousness into his political campaigns. It also puts a spotlight on the extent to which African leaders of newly independent states helped to define the pan-Africanism of this period by detailing the impact of Julius Nyerere on Manley’s thinking. Finally, it juxtaposes Manley’s acceptance in pan-African circles across Africa with his personal struggle over his own perceived distance from blackness, as a member of Jamaica’s “brown’ elite. In the end, Rastafari was absolutely central to generating the brand of politics surrounding race, color and class in the moment of decolonization. The history of repatriation transgresses analytical boundaries between state and nonstate actors.

scholarly journals ESTIMATION OF RISK MANAGEMENT EFFICIENCY FROM THE PERSPECTIVE OF THE STAKEHOLDERS

2015 ◽  
Vol 10 (2) ◽  
Author(s):  
Vasilisa Makarova
Keyword(s):  
Risk Management ◽  
Stock Prices ◽  
Key Factors ◽  
Statistical Research ◽  
Management Efficiency ◽  
The Subject ◽  
The Moment ◽  
Object Of Study ◽  
The Impact ◽  
Comprehensive Study

Estimation of efficiency from the perspective of an external investor draws a high enough interest in assessing the efficiency of risk management. Since the methods risk management are nontransparent information, the carrying out of empirical research is enough complicated. However, in a number of papers the elements of the assessment of so-called "market efficiency" are traceable, among which the most common factors are: the behavior of stock prices at the moment of collapse of the market, lower average cost of capital. However, a comprehensive study on risk management efficiency of companies from the perspective of stakeholders has not yet provided. The aim of this study is to fill this gap. The purpose of this study is as follows: to identify how stakeholders assess the key factors of risk management efficiency, and to create a comprehensive approach to the implementation of this assessment with the using of statistical research techniques and methods. The object of study is the Russian real sector of economy, the subject of study is the risk management efficiency of companies. In this article author provides the results of the survey on the evaluation the risk management efficiency, processed by means of statistical analysis methods calculation of the actual ratings of Russian companies on the basis of the criteria obtained from the survey, as well as the results of the regression analysis of the impact of identified efficiency criteria of risk management on the investment attractiveness of Russian companies. In the article Russian companies are ranked based on their risk management efficiency.

scholarly journals The Polish Mother on the defensive? The transformation of the myth and its impact on the motherhood of Polish women

2020 ◽  
Vol 3 (1) ◽  
pp. 140-153
Author(s):  
AGNIESZKA IMBIEROWICZ
Keyword(s):  
Social Reality ◽  
Value Systems ◽  
National Consciousness ◽  
The Family ◽  
Real Socialism ◽  
Polish Society ◽  
The Subject ◽  
Cultural Content ◽  
The Moment ◽  
The Impact

The subject of this presentation is the attempt to defi ne and to present the origins, socio-cultural content and the evolution of The Polish Mother myth, present in the polish national consciousness. The author tries to show how this myth was born, what functions it fulfi lled and what forms it took in the changing historical and social reality, from the moment of loss of independence, through a period of real socialism, until the present day. The impact of this myth in the lives of real women and their motherhood is taken into consideration. Then, the author comparing the results of the latest polish sociological rese-arches on the family and its transformation, and transformation of value systems together with theories about the specifi cs of life in the period of postmodernity, wonders whether it’s time to deconstruct the myth of The Polish Mother, because it does not fi t the conditions of today’s world, which is characterized, above all, by the apotheosis of individuality, self--realization and freedom, or perhaps in polish society there is still strong traditionalism in thinking about motherhood, and the myth of The Polish Mother is still alive?

Certain legal and technical defects of criminal, criminal procedure and criminal Executive legislation affecting the activities of institutions and bodies executing criminal penalties

2019 ◽  
pp. 42-49
Author(s):  
Юлия Павловна Колесникова
Keyword(s):  
Criminal Procedure ◽  
Theoretical Development ◽  
Legal Norms ◽  
Legal Studies ◽  
Legal Method ◽  
General Scientific ◽  
The Subject ◽  
Criminal Penalties ◽  
The Moment ◽  
The Impact

Предметом исследования выступило взаимодействие уголовного, уголовно-процессуального и уголовно-исполнительного законодательства и его влияние на деятельность учреждений и органов, исполняющих уголовные наказания. Цель работы заключается в обобщении отдельных направлений материализации дефектов указанных отраслей законодательства и оценке влияния данных дефектов на деятельность уголовно-исполнительной системы. В основе исследования лежит общенаучный анализ и специально-научный формально-юридический метод. Исследование основано на оценке технико-юридической составляющей отдельных правовых норм, имеющих значение для деятельности учреждений и органов, исполняющих уголовные наказания. Результатом работы является формирование открытого перечня разновидностей дефектов части системы права, изучаемой в рамках установленного предмета исследования. Материалы могут быть использованы для совершенствования юридико-технической составляющей уголовного, уголовно-процессуального и уголовно-исполнительного законодательства. Выводы. Объем и актуальность предмета исследования позволяют сделать вывод, что в настоящий момент рано говорить о его исчерпании. Определенное в статье направление нуждается в дальнейшей разработке. Теоретическая разработка возможна и необходима и в рамках отраслевых юридических исследований с целью выявления конкретных недостатков юридической техники, и в рамках теоретико-правовых исследований с целью обобщения дефектов и поиска универсальных путей их устранения. The subject of the study was the interaction of criminal, criminal procedure and penal enforcement legislation and its impact on the activities of institutions and bodies executing criminal penalties. The purpose of the work is to generalize certain areas of materialization of defects in these branches of legislation and to assess the impact of these defects on the activities of the penal system. The research is based on General scientific analysis and specially scientific formal legal method. The study is based on the assessment of the technical and legal component of certain legal norms that are important for the activities of institutions and bodies executing criminal penalties. The result of the work was the formation of an open list of varieties of defects of the part of the system of law studied within the established subject of research. The materials can be used to improve the legal and technical component of criminal, criminal procedure and penal enforcement legislation. Summary. The volume and relevance of the subject of research, allow us to conclude that at the moment it is too early to talk about its exhaustion. The direction defined in the article needs further development. Theoretical development is possible and necessary both in the framework of branch legal studies in order to identify specific disadvantages of legal equipment, and in the framework of legal theoretical studies, in order to generalize the defects and find universal ways to eliminate them.

Trajectory of light ray slightly above the equatorial plane in Kerr geometry and its deflection

2017 ◽  
Vol 95 (12) ◽  
pp. 1307-1312 ◽  
Author(s):  
Sarani Chakraborty ◽  
A.K. Sen
Keyword(s):  
Impact Parameter ◽  
Equatorial Plane ◽  
Deflection Angle ◽  
Kerr Geometry ◽  
The Past ◽  
The Impact ◽  
Analytical Expressions ◽  
Made In

Deflection angle for a light ray travelling in the equatorial plane of a rotating Kerr mass has been calculated in the past by various investigators. Considering the light ray to be travelling only slightly above the equatorial plane, calculations have been made in the present paper for such a ray’s deflection angle. We calculate deflection angles for the light ray at various heights above the equatorial plane, which are small compared to the impact parameter and derive corresponding analytical expressions for deflection angle.

scholarly journals The influence of selected mining and natural factors on the sinkhole creation hazard based on the case study

2021 ◽  
Vol 80 (3) ◽  
Author(s):  
Piotr Strzałkowski
Keyword(s):  
Rock Mass ◽  
Public Safety ◽  
Current Issue ◽  
Underground Mining ◽  
The Public ◽  
Natural Factors ◽  
The Subject ◽  
The Moment ◽  
The Impact

AbstractThe formation of sinkholes, especially in developed areas, constitutes a considerable hazard to the public safety. Due to the above, the subject of the paper is a significant and current issue. The paper includes a case study of sinkholes forming over shallow mine galleries. Calculations of the workings’ stability and the impact of the underground mining exploitation have been conducted. The probability of sinkhole formation has been determined as well. The time of sinkholes formation did not correspond with the time in which the mining exploitation affected the gallery workings and the moment in time for which the rock mass deformations caused by the exploitation were at the highest level. The performed exploitation caused occurrence of cracks in the rock mass over the working. This allowed the transportation of the loose overburden by rainwater to workings and as a result sinkholes were created—suffosion occurred. The Quaternary overburden built of sands and sandy loams was probably washed out by rainwater, which led to the formation of sinkholes. In all locations, where shallow voids exist at a depth up to 100 m and the overburden consists of loose rocks, one should consider the probability of sinkholes formation.

scholarly journals Criminal liability for illegal transplantation: past, present, future

2021 ◽  
Author(s):  
S. V. Grynchak
Keyword(s):  
Criminal Liability ◽  
Criminal Code ◽  
Causal Link ◽  
Systematic Change ◽  
Human Organs ◽  
Significant Harm ◽  
The Subject ◽  
The Moment ◽  
The Impact ◽  
Subjective Side

Transplantation of human anatomical materials is an important method of treatment aimed at restoring human health, so improving the criminal law regulation of combating illegal transplantation is certainly important. This article provides a comprehensive scientific and practical analysis of the formation, development and reform of legislation that provides transplantation of anatomical materials to humans. To do this, the author systematically studied the regulatory legislation in the field of transplantation and the changes that have taken place in it, identified all the changes made to Art. 143 of the Criminal Code of Ukraine during its validity, the impact of these changes on the practice of application of Art. 143 of the Criminal Code of Ukraine. The study of the legal support of transplantation was conducted through three main stages of transformation of legislation during the independence of Ukraine. This allowed us to draw the following conclusions: 1) the subject of the crimes under Art. 143 today is human anatomical materials. This means that, in addition to human organs or tissues, it covers anatomical formations, human cells and human fetal materials; 2) the systematic change of regulatory legislation in the field of transplantation complicates the establishment of the current procedure and conditions of transplantation of human anatomical materials, and, as a consequence, complicates the detection of signs of illegal transplantation; 3) the current corpus delicti provided in Part 1 of Art. 143 of the Criminal Code, is material, which requires the establishment, in addition to the act, socially dangerous consequences (significant harm to the victim) and the causal link between the act and the consequence; 4) the subjective side of the crime provided by part 1 of Art. 143 of the Criminal Code, from the moment of adoption of the Criminal Code of Ukraine until December 28, 2019, both intentional and negligent violation of the statutory procedure for transplantation of human anatomical materials was criminally punished, and from December 29, 2019, the act can only be intentional and the attitude to consequences only negligent; 5) since the adoption of the Criminal Code of Ukraine and until now, the legislator has twice increased the penalties for crimes under Art. 143 of the Criminal Code. In the final case, the penalty was increased for all sanctions under Art. 143 of the Criminal Code without exception.

Managing Service Quality, Food Quality, Price Fairness and Customer Retention: A Holistic Perspective

2020 ◽  
Vol 2 (1) ◽  
pp. 1-5
Author(s):  
Ammar Ahmed ◽  
Rafat Naseer ◽  
Muhammad Asadullah ◽  
Hadia Khan
Keyword(s):  
Service Quality ◽  
Food Quality ◽  
Service Sector ◽  
Customer Retention ◽  
Price Fairness ◽  
Policy Makers ◽  
Restaurant Management ◽  
The Subject ◽  
Research Propositions ◽  
The Impact

In this competitive environment, organizations strive to satisfy their customer by providing best quality service at affordable and fair prices with a view to enhance their revenues. To achieve the objective of revenue maximization, organizations strive to identify the factors that help them in retaining their customers. Drawing from the signalling theory of marketing, the current study proposes a novel conceptual model representing the impact of service quality with food quality and price fairness on customer retention in restaurant sector of Pakistan. The paper underlines an important arena of knowledge for academicians as well as organizational scientists on the subject. On the basis of literature available on the variables understudy, the present study forwards eight research propositions worthy of urgent scholarly attention. The conceptualized model of the present article can also be viewed significant in unleashing further avenues for the restaurant management entities, policy makers and future researchers in the domain of managing in the service sector businesses.

Sign in / Sign up

Export Citation Format

Share Document