bluuebunny/crossref_metadata_2025_split huggingface dataset:
Valve-Sparing Operation in Patients with Aortic Root Aneurysm
Authors: Tsvyk A. S. , Dovgan A. M. , Varbanets S. V. , Payuk V. V. , Pukas A. Y. 
Published: April 2020

Background. Aortic root aneurysm is rare but life-threatening disease which affects not only aortic wall, but aortic valve as well. Valve-sparing operation was developed by Tirone David and gave a chance to save native aortic valve in patients with aortic root aneurysm and to avoid aortic valve replacement.
The aim. To analyze postoperative results and complications after aortic valve-sparing operation in patients with aortic root aneurysm.
Materials and methods. Sixteen patients with aortic root aneurysm were operated at the Ukrainian Children’s Cardiac Center (UCCC) during the period from 2012 to 2018. The patients underwent aortic root reimplantation.
Results. Postoperative results were analyzed in 100% cases. Mean postoperative follow-up period was 25.6 ± 13.3 months. Total mortality was 0%. No patients required re-operation due to aortic aneurysm or that on aortic valve.
Conclusions. Collected data indicates that aortic root reimplantation is the procedure which can be chosen both for young and old patients. This is the procedure with lower risks and mortality comparing to aortic root replacement. It gives chance to preserve native aortic valve and its adequate functioning. Postoperative observation results indicate long-term freedom from reoperation due to aortic aneurysm and aortic valve insufficiency. This procedure is equally efficient in patients with either tricuspid or bicuspid aortic valve and can be efficiently implemented in patients with Marfan syndrome.
Long-Term Outcome of Left Main Percutaneous Coronary Intervention in Patients with Coronary Artery Disease
Authors: Marushko A. , Mankovsky G. , Marushko Ye. , Kuzmenko S. , Rudenko N. 
Published: April 2020

At the present time, left main (LM) stenting is an alternative to coronary artery bypass grafting in patients with coronary artery disease (CAD) and haemodynamically significant LM lesion. Despite of long history of LM interventions, long-term results are still poorly understood. Presented data are still conflicting and need further affirmation.
Aim. To investigate long-term outcomes of percutaneous coronary intervention (PCI) in patients with LM lesions.
Materials and methods. The study included 27 patients with CAD with haemodynamically significant LM lesion who underwent PCI. The risk was calculated using the SYNTAX Score and the SYNTAX Score II in all the patients. According to the results of the calculation, patients were divided into 3 groups: the low risk group (SYNTAX Score = 0-22) included 16 (59.3%) patients, the medium risk group (SYNTAX Score = 23-32) included 8 (29.6%) patients, and the high-risk group (SYNTAX Score > 32) included 3 (11.1%) patients.
Results. The incidence of major adverse cardiovascular events during the mean follow-up period of 30.9 months was 11.1%, while 89.9% of patients had good immediate and long-term results of the procedure. Fatal cases were reported only in groups of patients with intermediate and high risk according to evaluation by the SYNTAX score. No fatal cases were observed in low risk group of patients according to the SYNTAX score. Thus, patient affiliation with one of the risk groups based on the SYNTAX Score scale affected the long-term LM PCI outcomes.
Conclusions. In patients with LM lesion, PCI can be performed with good long-term results in 89.9% of cases. The main criterion for the selection of patients for LM PCI is the risk calculation data based on the SYNTAX Score scale, taking into account the decision of the Heart Team.
The mathematical description of process of heat exchange particles of oil shale and ash the coolant in the semi-coking conditions in a rotating drum reactor installation with solid heat carrier
Authors: Selivanov A. A. , Batrakov P. A. , Markin A. N. , Vdovenko I. A. , Afanaseva O. V. 
Published: April 2020

The article deals with the modeling of heat transfer process in a drum reactor of a semi-coking unit of oil shale with a solid coolant between ash and shale particles in the conditions of constant separation of vapor-gas products. The dominant role of the convective component of the process is revealed and the curves of heating of shale particles are obtained taking into account the endothermic effect.It is established that the smallest fraction of fuel warms up within 30-60 seconds and further serves as a source of heat for other fractions. In the interval of 400-600 seconds, the heating of the largest fraction is completed. The further stay of the shale mixture in the reactor is caused by the lagging rate of the thermal decomposition process from heat exchange, and the temperature decrease by 20-250C by the presence of the endothermic effect of the decomposition of organic matter.
Control of the Products’ Conformity to the Requirements of Technical Regulations of the Customs Union in Forensic Commodity Examination
Authors: Tukmakov S. V. 
Published: April 2020

The procedure of the conformity statement of the products to the requirements of the technical regulations of the Customs Union and the algorithm for the control of the conformity to the enabling documentation are analyzed. Templates for the conformity verification are described. The article addresses the contents of the enabling documentation (conformity certificate, declaration of conformity) with the description of each element. An algorithm for the definition of the products’ conformity/non-conformity to the particulars contained in the enabling documentation on the example of furniture products and its consistency with the conformity certificate/declaration of conformity to the requirements of the technical regulations of the Eurasian Economic Union.
Experiencia en capacitación y transferencia de herramientas didácticas sobre el uso racional de la energía y energías renovables
Authors: Cisterna M. Susana , Ledesma Sara Lia , Martínez Cecilia F. , Nota Viviana M. , Quiñones Graciela I. , Márquez Vega S. Gabriela , Llabra Cristina , Mostajo M. , Ramos M. , Atencia S , Villa C. 
Published: April 2020

<p>Se presentan las actividades desarrolladas en el marco del Proyecto de Extensión “Capacitación y transferencia sobre mejoramiento de condiciones ambientales, uso racional de energía y energías renovables”, llevado a cabo por docentes de la cátedra de Acondicionamiento Ambiental I de la Facultad de Arquitectura y Urbanismo de la Universidad Nacional de Tucumán, con el fin de impulsar la incorporación de la temática energético-ambiental a través de contenidos y actividades en escuelas públicas de Tucumán. Las actividades planteadas buscan promover el uso racional de la energía y la aplicación de energías renovables para ahorrar energía en la escuela y en la propia casa. Se trabajó en forma articulada con la Secretaria de Medio Ambiente de la Provincia, quien a través de su “Equipo Provincial de Educación Ambiental” brindó la vinculación y coordinación con las escuelas de la Provincia. En la presentación se muestran los resultados de una experiencia piloto desarrollada con participación de directivos, docentes y alumnos de 4º y 5º grado de la escuela primaria Capitán de los Andes de nuestra provincia. Las actividades incluyeron el diseño y prueba de herramientas didácticas y transferencia del material para la implementación de la experiencia por parte de los docentes de la escuela. La experiencia piloto abarcó el planteo de contenidos y actividades en relación a las necesidades detectadas en la curricula actual, dictado de clases con apoyo audiovisual y talleres demostrativos de sistemas con aplicación de energía solar. Los principales contenidos abordados en las clases incluyen los tipos y formas de aplicación de la energía, su relación con el cambio climático. Sistemas y aplicación de energías renovables, la energía en los edificios, uso racional, posible ahorro y mejoras en las condiciones de habitabilidad. Sistemas con aplicación de energía renovable, con utilización de diferentes materiales y accesorios. También se incluyen talleres con modelos demostrativos de dos sistemas con energía solar: Horno Solar y Colector de Agua, con preparación de alimentos y de agua caliente sanitaria, factibles de ser construidos y utilizados en la escuela y en la propia casa. Conclusiones: Las actividades desarrolladas permitieron conocer las necesidades, transferir conocimiento y desarrollar pensamiento crítico en el contexto de la educación escolar primaria de Tucumán, en pro de una conciencia ambiental más eficiente que considere y evalúe en profundidad, sobre bases científicas, la incorporación de energías renovables y formas de uso racional de la energía en los ámbitos donde desarrolla diariamente sus actividades.</p><p> </p>
Effect of a Novel Chemical Treatment on the Physico-Thermal Properties of Sugarcane Nanocellulose Fiber Reinforced Epoxy Nanocomposites
Authors: Mohit H. , Selvan V. Arul Mozhi 
Published: April 2020

Abstract
In the present investigation, a novel chemical treatment was introduced for the extraction of nanocellulose fibers from sugarcane bagasse and applied as reinforcement material to enhance the physical properties and thermal stability of epoxy nanocomposites. Epoxy nanocomposites with different weight fractions were fabricated using a wet layup process followed by furnace heating to remove the residual moisture content. The influence of surface modified sugarcane nanocellulose fiber loading on morphological (transmission electron microscope) properties of epoxy nanocomposites was investigated. The porosity and water absorption increase with the increment in fiber weight fraction for both treated and untreated nanocellulose fiber-epoxy composites. Among the various treatment processes, the alkali-treated fibers reinforced epoxy composites showed better thermal stability and water absorption resistance under 10 wt.% of nanocellulose fiber reinforcement.
Simulation of Low Density Polyethylene (LDPE) Pyrolysis and Optimisation of Pyro-Oil Yield
Authors: Adeniyi A. G. , Ighalo J. O. 
Published: April 2020

Abstract
Plastic pyrolysis has been studied over the years and has been proven to be a viable method of converting waste materials into useful products. Low-density polyethylene (LDPE) is of particular interest as it makes up a significant part of solid waste stream. Aspen HYSYS was used to model the steady-state pyrolysis of waste low-density polyethylene (LDPE) based on a combination of kinetic and thermodynamic approaches. The results of the numerical optimisation (at a basis of 10 kg/h feed) showed that 100% conversion and a maximum of 91.6% oil yield can be achieved at a temperature of 449 °C and a purge gas flowrate of 1.21 kg/h. Reaction temperature was found to be a more important process factor than purge gas flowrate. Correlations were also developed for the prediction of oil yield and reaction conversion based on the process temperature and purge gas flowrate. The analysis of variance (ANOVA) showed that the correlations for both reaction conversion and oil yield were statistically significant.
Improving the quality and efficiency of using the labour and resource potential of the tourism enterprises on the basis of motivation and stimulation of their employees
Authors: Romaniuk Iryna 
Published: April 2020

The subject of the research is theoretical aspects and practical recommendations for improving the labor resources of tourism enterprises by motivating and stimulating employees. The purpose of the work is to determine the peculiarities of labor resources of tourism enterprises and to improve the management of their development on the basis of the development of incentives and motivation of employees. Methodological basis of the article became both general scientific and special methods of scientific cognition. During the research methods were used: abstraction and scientific generalization, dialectical, monographic, system-structural analysis and synthesis, groupings. Results of work. The article identifies the socio-economic features of the labor resources of tourism enterprises, motivation and stimulation of their employees. The essential peculiarities of labor resources of tourism enterprises, requirements and expectations about it are determined. Validated evaluation criteria and standards of use. The need to develop a system of motivation and incentives for employees at the level of enterprises in the tourism industry is revealed. Their main components are proposed. The field of application of results. The findings and recommendations can be used in the training of management, economics and tourism professionals; in the management of tourism enterprises, in rural green tourism. Conclusions. In the process, it was found that labor potential is of particular importance in the development and enhancement of competitiveness of tourism enterprises. Its exceptional role is explained by the leading role in the provision of tourist services and the identification of their quality and level of provision directly with employees. Therefore, employees must have special skills, know the psychology of communication, be not only managers, but also psychologists, marketers and advertisers. Tourism enterprises, for their part, must develop systems of material and moral incentives and motivation for work.
Role of tolerance in the transnational companies’ management system
Authors: Yatskevych Inna , Krasnostanova Nataliia 
Published: April 2020

The relevance of the research topic is explained by the rapid development of integration processes, the formation of a global economic space, which led to the intensive development of multinational companies. In these conditions, the issue of the role of tolerance in the management system of multinational companies is becoming relevant. Formulation of the problem. New opportunities associated with the formation of the main aspects of tolerance in the management system of multinational companies and draw certain conclusions. Analysis of recent research and publications. The study of certain aspects regarding the functioning and development of multinational companies was covered in the works of such authors as Krivov'yazyuk I., Mekshun P., Melnichuk V., Mikaelyan S., Penska I., Skavronsky I., Terekhov E., Chumak N. and others. A great contribution to the study of issues on tolerance was made by such scientists as Y. Arabchuk, O. Orlovskaya, M. Pirenn and others. Highlighting unexplored parts of a common problem. In favorable conditions for the formation and development of multinational companies, the issue of tolerance in the management system of companies, which is most conducive to resolving a number of conflicts, remains unaddressed. Problem statement, research objectives. The aim of the study is to study the main aspects of tolerance in the management system of multinational companies and draw certain conclusions. The method or methodology of the study. In the work, general scientific methods were used: dialectic, system-structural analysis and synthesis, statistical and economic methods, generalization. Statement of the main material (results of work). The article indicates the role of transnational companies in modern conditions and determines that in the formation and development of these companies, tolerance acquires special meaning in the management system. The main directions of the problems of interethnic relations are systematized and their solutions are recommended by regulating the professional activities of employees of transnational companies. The significance of the “tolerance corridor” in the management system of multinational companies is determined. Scope of the results. The conclusions and results of the article can be used in the educational process of the economic faculties of higher educational institutions. At the same time, the results of the work can be used in the formation of the management system in multinational companies and in the process of professional training of company employees. Conclusions are consistent with the article. Based on the study of the role of tolerance in the management system of multinational companies in the modern conditions of development of Ukraine, the result is that tolerance should be based on professional training of company employees, which is formed on the basis of the tolerance corridor.
Conceptual principles of staffing publishing cooperatives in the study of economic history
Authors: Kostyk Yevhenii 
Published: April 2020

The subject of research is the socio-professional staff of the founders, members and co-workers of publishing cooperatives operating in the USSR to study the issues of Economic History. The goalof research is to study with regard to Economic History the socio-professional staff of the founders, members and co-workers of publishing cooperatives operating in the USSR to study the issues of Economic History. Methods of research. All components of the study are based on fundamental principles – scientific, historicism, objectivity, system, development, priority of concrete verity, pluralism; and also the methods of knowledge of social and economic processes of social development – analysis, synthesis, problem-chronological, comparative analytical, archaeological, retrospective, statistical, a systematic and integrated approach. Research methodology. In the process of the study, the fundamental principles were based on Economic History and History of Economic Thought, the Ukrainian and foreign scientists’ works and experts in this area. Results of work. In the article, the socio-professional staff of the founders, members and co-workers of publishing cooperatives operating in the USSR to study the issues of Economic History has studied. The field of application of results. The results of this research can be applied to study the issues of Economic History and History of Economic Thought, History of the Publishing Industry. Conclusions. Thus, the staff training system for the book-trading network, including the publishing cooperative, had some specific features. Compared to the program to train workers of printing production, where the state took part actively, the financing for the training of booksellers and cooperative publishers was totally devoid of state support. This was the fundamental position of the Soviet state, which, despite the New Economic Policy, continued “to look" at the sphere of trade and the associated need to study the book market, as a relic of capitalism. It is undeniable that giving the cooperative the opportunity to organize a training system for the book-trading network to some extent intensified the market relations in the republic, facilitated the study of the specificity of readers' demand as well as stimulated the development of publishing activity in Ukraine. However, the peaceful coexistence of the socialist-organized production of printed matter and the market system of its proliferation lengthy until the end of the 1920s, when, together with the cooperative publishing houses, a training staff system for the book trade was state-controlled.
Fiscal policy and economic development
Authors: Pasichnyi Mykola 
Published: April 2020

The research subject includes the theoretical basis and mechanisms of fiscal policy formation and realization as an instrument of economic development regulation. The aim of the study is to improve the theoretical and methodological basis of fiscal policy formation and determine the peculiarities of its impact on economic development. Methods. In order to achieve the appropriate tasks, we used a set of methods and approaches, that helped to ensure the conceptual unity of our investigation. The dialectical, systemic and structural approaches, methods of analysis and synthesis, comparison, generalization,economic and mathematical modeling, scientific abstraction are applied. Results. In this paper, we explored the main instruments of fiscal policy, which affect economic development. The experience of advanced counties in fiscal consolidation and stimulus measures during the Great Recession was systemized. Also, the author investigated the budget deficit impact on real GDP growth in OECD countries over the 1981-2017 period. Practical implications. Fiscal policy and instruments of its implementation. Conclusions. The regulation of the tax burden on labor and capital influences the conjuncture of these factors in the market. Fiscal regulation is one of the determining reasons for the migration of labor and financial capital between different regions and countries. Given the multiplicity of combinations of tax bases and rates, the government has significant potential to impact on investment and consumer demand, and real GDP growth. The impact of budget expenditures on aggregate demand should be examined considering the level (ratio to GDP) and different composition structures. It is vital to raise the weight ratio of productive expenditures in the overall structure, which leads to foster economic growth. Particularly important are the special productive expenditures that are directed towards the development of human capital; which include expenditures on education, health care, physical development, R&D. It is crucial to establish a consistent relationship between public spending and the obtained results to form an effective fiscal policy. The budget should be balanced, which requires the implementation of systematic fiscal consolidation measures, and it has been found that the growth of the budget deficit slows down economic growth. The priority of fiscal policy is to reduce the debt burden.