bluuebunny/crossref_metadata_2025 huggingface dataset:
Chinese Medicine in East Africa: An Intimacy with Strangers
Authors: Hsu Elisabeth
Published: July 2022

Based on fieldwork conducted between 2001-2008 in urban East Africa, this book explores who the patients, practitioners and paraprofessionals doing Chinese medicine were in this early period of renewed China-Africa relations. Rather than taking recourse to the ‘placebo effect’, the author explains through the spatialities and materialities of the medical procedures provided why - apart from purchasing the Chinese antimalarial called Artemisinin - locals would try out their ‘alternatively modern’ formulas for treating a wide range of post-colonial disorders and seek their sexual enhancement medicines.
Oswald Spengler and the Politics of Decline
Authors: Lewis Ben
Published: July 2022

Oswald Spengler was one of the most important thinkers of the Weimar Republic. In Oswald Spengler and the Politics of Decline, Ben Lewis completely transforms our understanding of Spengler by showing how well-connected this philosopher was and how, at every stage of his career, he attempted to intervene politically in the very real-life events unfolding around him. The volume explains Spengler’s politics as the outcome of a dynamic interplay between his meta-historical considerations on world history on the one hand, and the practical demands and considerations of Realpolitik on the other hand.
Delayed cerebral pseudoaneurysm following surgical and combined-modality therapy for glioblastoma multiforme: illustrative case
Authors: Krishnakumar Hari N. , Son Colin
Published: July 2022

BACKGROUND

Post–radiation therapy and chemotherapy cerebral pseudoaneurysms are rare entities. Within previous tumor treatment areas on nonvascular imaging, they are potentially confused as recurrent tumor.

OBSERVATIONS

A 61-year-old man was a long-term survivor of glioblastoma multiforme whose treatment consisted of open biopsy followed by radiotherapy to 60 Gy and systemic carmustine. On surveillance imaging, enlargement of a posttreatment cyst and new enhancing lateral “mural nodule” was first noticed approximately 16 years after initial treatment. Over 12 months, both continued to enlarge. Initially referred to as recurrence, subsequent angiography showed the mural nodule to be an unruptured distal middle cerebral artery pseudoaneurysm within the previous tumor bed. The patient underwent repeat craniotomy for clipping of the aneurysm and biopsy of the cyst wall, which was negative for malignancy.

LESSONS

Delayed pseudoaneurysms following radiation therapy and chemotherapy for malignant brain tumors are rare but have been previously reported. Their appearance on cross-sectional imaging can mimic recurrence, and they should be kept in the differential of new, circumscribed enhancement within such treatment areas.
Pilocytic astrocytoma of the optic nerve with intracystic hemorrhage in an adult: illustrative case
Authors: Kuramitsu Shunichiro , Suzaki Noriyuki , Takahashi Tatsuo , Murakami Yoshiko , Asai Takumi , Eguchi Kaoru , Ando Ryo , Tamari Yosuke , Ito Shohei , Kimata Masayuki , Terao Kazuichi , Kajita Yasukazu
Published: July 2022

BACKGROUND

Optic pathway gliomas are uncommon, accounting for 3–5% of childhood brain tumors, and are mostly classified as pilocytic astrocytomas (PAs). PAs of the optic nerve are particularly rare in adults.

OBSERVATIONS

The authors presented the case of PA of the left optic nerve in a 49-year-old woman along with detailed pathological and molecular analyses and sequential magnetic resonance imaging. The tumor had progressed during 5 years of follow-up along with cyst formation and intracystic hemorrhage; it had a thick capsule and contained xanthochromic fluid. The boundary between tumor and optic nerve was unclear. B-type Raf kinase (BRAF) V600E point mutations or translocations, IDH1-R132H mutations, loss of alpha-thalassemia/mental retardation X-linked, and 1p/19q codeletion were negative.

LESSONS

BRAF alterations in pediatric PAs of the optic nerve are less frequent than those observed in PAs in other lesions; the same molecular pattern was observed in the adult case, without changes in BRAF. Surgical management should be indicated only in cases with severely impaired vision or disfigurement because there is no clear border between the tumor and optic nerve. Further discussion is needed to optimize the treatment for adult optic pathway gliomas, including radiotherapy, chemotherapy, and molecular-targeted therapies, in addition to surgical intervention.
Modeling the Conceptual Foundations Functioning of the Luxury Hotel in Solomianskyi District of Kyiv
Authors: Tkachenko Tetiana , Antonenko Artem , Dzyundzya Oksana , Kryvoruchko Myroslav , Stukalska Natalia
Published: July 2022

Topicality. Nowadays, the national service area forms the economy of the state, country, its regions. It becomes an important factor of the stable development of the hotel sphere in modern hospitality industry structure. As one of highly profitable economy sectors, the modern hospitality sphere is the leading direction of socio-economic development of Ukraine. A number of factors restrains the development of the hotel economy in Ukraine, such as: disadvantages of the financial and banking system, limited solvency of the population, political situation in the country, deficient tax system, COVID-19 pandemic. One of the important ways to optimize the technological process in the hotel business is the rational use of resources.
The aim of the study is to establish and disclose the factors of influence in means of elaborating conceptual foundations of the hotel projecting functioning.
Research methods. The research is carried out by studying legislative acts of Ukraine, scientific publications on hotel projecting, statistics data, and expert assessments.
Results. The main theoretical and practical results that determine the novelty and practical significance of the study highlight the picturing of the sequence of actions in the development of conceptual hotel projecting principles. It can be presented in the form of such chain series: mission → hotel practical philosophy → type → category → purpose → comfort level → choosing a residence and meal system.
Conclusions and discussion. The importance of using the hotel conceptual projecting of comprehensive information is established. This concerns some factors that affect the hotel establishment functioning, as well as coordination of this information with value and targeted business installations, namely the missions of foundation and operation of the hotel establishment functioning, which bases on the formation of the hotel concept-project, and, additionally, on the principles that can be oriented on the use in operational management of the put into operation hotel in the future.
Innovative Technology of Chocolate Covered Multi Layered Chips
Authors: Dudarev Igor , Panasyuk Svitlana , Taraymovich Iryna
Published: July 2022

Topicality. The assortment of chips in the world market and technologies of their production are analyzed in this article. The main tendency of chips market is the growing demand for products from local natural raw materials, which retain all the nutrients to the highest degree. Therefore, it is important to elaborate a technology for chips production, which is supposed to combine traditional methods of processing raw materials with some new technological solutions. As a result, an innovative product with various combinations of raw materials, as well as a high caloric content, can be obtained by this new technology.
Aim and methods. The aim of the study is to substantiate and develop the technology of chocolate covered multi layered chips. Organoleptic research methods, the method of expert evaluations and the calculation method for determining quality and quantity indicators of chips are used to achieve the set purpose.
Results. The organoleptic properties of chocolate covered multi layered chips are studied. It is obtained that chips have different shapes and sizes. The color of the chips surface depends on the composition of glaze and raw materials. Chips have a faint smell of chocolate and a sweet or sweet-sour taste. The inner layers of chips do not have a crispy and brittle consistency. In this research, some means of chips value quality indicators are calculated, their nutritional and energetical value is determined.
Conclusions and discussion. It is obvious that adding berry powder to chocolate glaze improves taste properties of chips, the color of their surface and look in total. Chocolate covering of chips makes it possible to high their caloric content. The compositions of chips containing apple and berry powder have the highest values of quality, and the compositions of chips containing carrot and zucchini have the lowest ones. The scientific novelty of obtained results lies in the production technology elaboration of chocolate covered multi layered chips. The practical significance of the study results can be used in the expansion of chips assortment.
Quality as a Determining Factor of Satisfying the Consumers’ Needs in Restaurant Business Products and Services
Authors: Rusavska Valentyna , Neilenko Serhii
Published: July 2022

Topicality. Nowadays, the functioning effectiveness of restaurant industry establishments entirely depends on the level of the services and products compliance to the consumers’ requirements. Additionally, it is necessary to mention the urgent determining the consumers’ needs and demands regarding the services and products quality of the restaurant business. Therefore, the question of understanding the essence of such a complex and multifaceted phenomenon as quality becomes relevant for the restaurant establishments. A deep understanding of the quality content and structure makes it possible to elaborate more effective measures in order to improve the quality of restaurant services and products, that meet or even exceed the consumers’ expectations. As a result, it can form the main strategic direction in the competitive environment of the changing restaurant industry.
Aim and methods. The aim of the study is to conduct theoretical and practical analysis, systematization and generalization of scientific approaches of blighty and foreign scholars on the interpretation of the quality concept, as well as state standards for services and products quality definition, reasoning the role of services and products quality in satisfying the needs of the restaurant establishments consumers in order to high their competitiveness. The methodological basis of this research form the following methods of scientific analysis: methods of logical generalization, the systemic, functional and systemic-structural analysis.
Results. The concept of quality is defined as a set of certain characteristics of services and products that meet the existing or anticipated needs of consumers according to their purposes. The interdependence of the necessity in restaurant establishments providing the high stable level of services and products quality, in accordance with the requirements and needs of modern consumers in the market of goods and services, is proved. It is necessary to elaborate and apply a quality management system for services and products, which is an effective tool for improving the competitiveness of food and drink venues.
Conclusions and discussion. The results of scientific research prove that quality is a determining factor in evaluating the success of service and production functioning results, namely manufactured products and given services. This is one of key aspects that characterizes consumers’ demands for services and products quality. In turn, the needs of consumers are a determinant in formation the need for permanent improvement of quality, and implementation in the restaurant industry the quality management system for products and services.
Operational (Online) Analytics: New Technologies and Opportunities
Authors: Varenko Volodymyr
Published: July 2022

The aim of the article is to systematise and generalise new knowledge on operational ana­lytics and consider specific automated information systems in terms of the present and prospects for its development.
The research methodology was based on the general scientific principles of unity of theory and practice, systematics, complexity, and comprehensiveness of knowledge. The use of general scientific (description, analysis, synthesis, comparison, generalisation) and special (bibliograph­ic, sample observation, grouping, content analysis) methods at the empirical and theoretical lev­els of research contributed to achieving this goal.
The scientific novelty of the study is to generalise and systematise new and available knowledge on operational analytics in terms of present and prospects for its development within one study.
Conclusions. The case of the International Business Machines Corporation American elec­tronic corporation (pronounced IBM, also known as IBM or «Blue Giant»), one of the world’s largest manufacturers of all types of computers and software, one of the largest providers of global information networks, the author described and analysed the species diversity and fea­tures of the use of automated information and analytical systems based on artificial intelligence, which are available today to many users, and tomorrow will become a daily reality for any com­pany. The information systems and products that IBM now offers to the Ukrainian consumer are briefly described: systems designed for analytics by areas of application; Big Data analysts; data visualisation; policy analytics; data integration systems; advanced analytics products; in­formation systems of advanced analytics based on the Internet of Things; automated systems for forecasting analytics. Attention is focused on the features and benefits of operational analytics and its capabilities in the practical plane of use. The expediency of applying certain automated information systems according to the sphere of activity and stages of information analysis is substantiated. The advantages and prospects of operational (online) analytics development in data analytics are considered.
Foreign Experience and Practice of Ensuring the Confidentiality of Information and Creating Secure Conditions for the Functioning of Documents
Authors: Tsilyna Maryna
Published: July 2022

The aim of the article is to find out the safest conditions for the functioning of documents, as well as to find the most effective ways to avoid potential risks and dangers in the domestic information space.
The research methodology consisted of a set of general scientific and special methods of studying the issue. The review and analytical method was used to work on the professional and specialised literature and to determine the theoretical basis of the research, the systematic method proved to be effective in studying certain foreign practices of ensuring the confidentiality of information. The application of the induction method made it possible to generalise and draw a conclusion about the possibility of using the experience of other countries within the Ukrainian information space. Special methods, namely the method of researching document flows and the method of determining the information content of the document, were useful in considering the process of moving documents in the information field, the possibility/impossibility of damage or loss of information, and ways to prevent such undesirable situations.
The scientific research was based on the principles of objectivity and integrity. The use of a set of scientific methods made it possible to study the special features of confidential document information that is processed abroad, and to identify the main threats to the violation of the integrity and accessibility of information.
Scientific novelty. The latest practices of England, the European Union, and the United States in the field of document confidentiality are studied. The main recommendations for the protection of confidential information, and confidential agreements implemented abroad are considered. Features of secure use of document information are established. The article proposes a number of systematic measures against threats that arise in the process of working with confidential documents.
Conclusions. The study allows us to conclude that the Ukrainian legislative and regulatory framework should be formed taking into account global legislative initiatives and implementations. Сompanies, organisations, institutions, as well as individuals, need to ensure the protection of confidentiality of information, and given the threats, appropriate steps should be taken to ensure safe operation. The rules of identification and authentication should not be neglected, and a strict password policy should be used. The issue of information protection could be solved only in a comprehensive way.
Activity of Libraries of Vocational Education Institutions in Information and Communicative Space
Authors: Parzhnytsky Victor , Savenko Oleksandr
Published: July 2022

The aim of the article is to systematise, summarise new knowledge on the activities of libraries of vocational education institutions in the information and communication space, to consider specific activities in terms of present and prospects for their development.
The research methodology was based on the general scientific principles of unity of theory and practice, systematics, complexity, and comprehensiveness of knowledge. The use of general scientific (description, analysis, synthesis, comparison, generalisation) and special (bibliographic, sample observation, grouping, content analysis) methods at the empirical and theoretical levels of research contributed to achieving this goal.
The scientific novelty of the research is to generalise and systematise new and known knowledge concerning the activities of libraries of vocational education institutions in the information and communication space in terms of nowadays and prospects for its development within one research.
Conclusions. Current conditions of transformation of the learning process focused on distance education and the rapid development of digital technology pose new challenges to the libraries of vocational education institutions. The quarantine constraints that libraries faced in 2020-2021 demonstrated the need to reformat rapidly various types of library services into an online format. The most promising channel for promoting any information or resources today is the Internet.
The use of Internet technology in libraries is now mandatory for every librarian. Librarians should not only focus on information and communication resources and technologies, including the Internet but also apply this knowledge in practice.
Thus, the introduction of Internet tools in the activities of libraries of vocational education institutions is an urgent necessity. Librarians can effectively use a great variety of Internet services in their daily work and bring vocational education institutions’ information and library services to a qualitatively new level.
Internet Marketing Specialist in Programme Subject Area "Information, Library and Archival Studies": Functions and Competences in Convergent Professional Practices
Authors: Novalska Tetiana , Bachynska Nadiia
Published: July 2022

The aim of the article is to identify the Internet marketing specialist’s job functions and competencies in convergent professional practices, which are generalised and standardised in the Professional Standards of Related Activities.
Such methods define the research methodology as information analysis of current Professional Standards, relevant to the activities of Internet marketing specialist; semantic analysis of the programme subject area, and semantic, logical and linguistic analysis of documents (e.g. educational and professional standards, training curriculum, professional scientific publications, Internet content); the pedagogical design is to integrate disciplines to the Internet marketing specialist educational and professional training curriculum.
The scientific novelty of the study is in identifying functions and competencies of Internet marketing specialist in the programme subject area “Information, Library and Archival Studies”, in related professional activities, presented in the Professional Standards of Information Resources Specialist, Commodity Market Research Analyst and Advertiser; in implementing professionally-oriented disciplines, which form an educational model of training an Internet marketing specialist in the interaction and relationship of all its components together with other fields of professional and practical training.
Conclusions. The uniqueness of the content of the “Management of Social and Communication Networks. Internet Marketing» curriculum within Information, Library and Archival Studies is determined by its subject orientation on digital means of work, convergence with curriculum in marketing and belonging to the subject field of information management, information-analytical and social-communicative activities following the theoretical content of the subject according to the standard of programme subject area 029 «Information, Library and Archival Studies».
A comprehensive review of the functions of Internet marketing specialist in marketing and information-analytical professional practices and the use of social and communicative technology to position social actors in society (public relations, advertising, image-making, etc.) allows a systematic delineation of the competence of the specialist.
The analysis of the Professional Standards of the Information Resource Specialist, Commodity Market Research Analyst, and Advertiser, as related to the activities of an Internet marketing specialist, made it possible to outline the competencies that should be included in the future specialist’s model to ensure its validity.
The identified competencies allow to specify the educational and professional training curriculum and include generalised disciplines in the campus, which together with other professionally oriented disciplines, form an educational model of Internet marketing specialist training in the interaction and interconnection of all its components.
Creation of progressive hole processing processes based on the study of contact phenomena during deforming broaching and finishing antifriction non-abrasive treatment in various technological environments
Authors: Nemyrovskyi Ya.B. , Shepelenko I.V. , Posviatenko E.K. , Chernovol M.I. , Zlatopolskiy F.Y.
Published: July 2022

This work is devoted to the creation of progressive technological processes for processing holes. The relevance of studying this issue is substantiated, technological environments (TE) used in these operations are listed. The purpose of the work performed is to study the influence of TE on contact phenomena and quality parameters of the treated surface during deformation broaching (DB) and finishing antifriction non-abrasive processing (FANT) and the creation on this basis of new technological processes to obtain parts with improved performance. New methods have been developed for studying contact interaction in the case of DB using solid lubricants, as well as for modeling the FANT process. The conditions for the use of liquid lubricants in the DB are described. It has been established that, when them applied, the altitudinal roughness parameters decrease and the surface layer hardens to a considerable depth. It is shown that the use of solid lubricants in DB is mandatory when processing products from hard-to-work materials and alloys. When them applied, significant plastic deformations of the hole can be made. In this case, the surface layer of the workpiece is little different from the original. The change in the altitude parameters of the rough layer, as well as contact pressures using solid lubricants, was studied. Peculiarities of contact phenomena in the case of DB using solid lubricants are revealed. For this case, a functional relationship has been established between the altitude parameters of roughness and the relative contact pressure. An analytical dependence is proposed for their calculation. The boundary conditions for its application are determined. Formation FANT also occurs when using the TE. It was established that solid lubricants during FANT perform a dual function, namely, technological, like solid lubricant during processing, and operational - improve the quality parameters of the processed parts. The combination of DB and FANT operations allows us to develop a new technological process for processing holes of parts such as bushings and sleeves. This process consists in the use of DB as a roughing and finishing operations, and FANT as a finishing operation, which allows to improve the quality indicators of the machined part
Structure research of nanoscaled silicon carbide detonation coatings of tribotechnical application
Authors: Dovhal A.H. , Pryimak L.B.
Published: July 2022

Presented studies are related to the spheres of wearproof coating development. World wear resistance improvement technology experience has accumulated a huge amount of statistical material on the failure due to increased level of parts wear. That is why the issue of research and improvement of anti-wear properties of machine elements is one the components when considering the priority directions of ensuring the reliability of operation motor vehicles and friction units. The SiC coating has been deposited on the medium carbon steel using detonation deposition. It has been established that it is very sensible for modes of coating deposition and different physical and chemical phenomenon have been detected. The structure of the obtained coating has been thoroughly researched on the electronic microscope. The obtained coating has been developed for testing on the friction bench modeling the friction process that is taking place in the couple of main and rod journals of internal combustion engines. The coating has also the corrosion protection. The new magnet modified method of detonation coating deposition has been tested for deposition of nanoscaled coating on mild carbon steel. The optimal modes of the magnet modified coating deposition for silicon carbide powders batch mixture from the viewpoint of structure formation have been detected.
Experimental verification between the functioning of tribosystems in the conditions of boundary lubrication
Authors: Voitov A.V.
Published: July 2022

The paper presents an experimental test of modeling the limits of stable operation of different structures of tribosystems (robustness criteria) in the conditions of extreme lubrication. The results of the experimental test confirmed the previously concluded conclusion that not all structures of tribosystems lose stability in terms of the coefficient of friction, i.e. the appearance of burrs on the surfaces of the friction. At low values of the coefficient of shape and low values of the quality factor of the tribosystem, the loss of stability occurs due to accelerated wear of materials.Expressions for calculation of criteria of robustness of tribosystems taking into account speed of change of loading on tribosystem are received. The rate of change of load is taken into account by the coefficients of dynamism, which are obtained taking into account the right-hand side of the differential equation of the dynamics of the functioning of tribosystems. Analysis of the obtained theoretical results on the assessment of the robustness of tribosystems and their comparison with the results of the experiment, suggest that the obtained conditions for stable operation of tribosystems (criteria of robustness) allow theoretically, with error 10,3 - 13,3 %, determine the boundaries of sustainable work. Criteria for the robustness of the tribosystem by wear rate and friction coefficient should be used in the design of tribosystems.
The influence of the alloying of the auger by the chromium on its wear during dehydration process of municipal solid waste in the garbage truck
Authors: Bereziuk O.V. , Savulyak V.I. , Kharzhevskyi V.O.
Published: July 2022

The article is dedicated to the study of the influence of the alloying of the auger by the chromium on its wear during dehydration of solid waste in the garbage truck. Using the method of regression analysis, the hyperbolical dependencies of auger wear depending on the chromium content in its hardened steel for different values of the friction path are determined. Graphical dependences of augur wear depending on the chromium content in its hardened material as a function ​​of the friction path are made up, and it confirms sufficient convergence of the obtained dependencies. Carried out additional regression analysis allowed to determine that that during two weeks of operation of the auger during dehydration of solid waste in the garbage truck increasing of the chromium content in its hardened material from 0.25% to 12% reducing the speed of the wearing and energy consumption of solid waste dehydration from 12.2% to 3.1%, and, consequently, to reduce the cost of the process of their dehydration in the garbage truck. It is shown the graphical dependence of the reduction of energy consumption of dehydration of solid household waste by the hardened auger due to its alloying by the chromium. It was established the expediency of further research to determine the rational content and structural state of the material of the auger and the ways to increase its wear resistance.
Determination of the dynamic hardness of greases as a characteristic of deformation properties in a tribocontact
Authors: Dykha O. , Staryi A. , Dytyniuk V. , Dykha M.
Published: July 2022

The efficiency of plastic oil is determined by the duration of its retention on the surface. Evaluation of the effectiveness of plastic lubricants depends on their mechanical properties. It is proposed to use the dependence of hardness on time when pressing a spherical indenter as one of the basic characteristics of the mechanical properties of plastic oils. The method of determining the function of oil hardness is based on the mechanics of contact interaction of a solid ball and a plane presented in this work, which has the property of creep according to the flow theory. One of the main methods of testing the deformation properties of plastic lubricants is to determine the number of penetrations. The number of oil penetrations is determined by the depth of indentation of the indenter; more informative for such a process is the ultimate pressure (hardness), which actually reflects the phenomenon of resistance to indenter indentation in the material. For uniform distribution of pressure under a spherical indenter the technique of construction of function of dynamic hardness of plastic materials is defined and on the basis of tests results of construction of dynamic hardness are received. Tests on contact creep of plastic lubricants are carried out, functions of dynamic hardness are received and the analysis of influence of character of change of dynamic hardness on wear processes in the presence of lubricants is carried out. To analyze the influence of deformation properties on the tribological properties of lubricants, comparative tests of the two above-mentioned types of lubricants on a four-ball friction device were performed. It was found that Litol-24 oil has the best wear resistance. The nonlinear period of running-in for this oil is practically absent that, obviously, under the given conditions of tests is connected with more stable in time deformation properties.
Increasing warning resistance of engine valves by gas nitrogenization method
Authors: Marchenko D.D. , Matvyeyeva K.S.
Published: July 2022

The article presents the results of tribological research on the most promising way to restore and increase the wear resistance of engine valves by developing a method of gas nitriding. It is established that with increasing operating time the guide bushings of the outlet connections wear out with the displacement of the axis of the forming surfaces of the hole. Characteristic significant displacement of the axes of the inlet connections is not detected, ie. their wear on the diameter of the hole is 1.5 ... 3 times less than the wear of the exhaust bushings, the values of the displacement of the axes are within the error of the measuring instrument. The average value of ovality is greater in the exhaust seats - the maximum beating values of the intake seats are 0.34 mm, exhaust - 0.22 mm. It is proved that the non-uniformity of the wear of the sleeve hole is determined by the balance of acting forces, which, in turn, are determined by deviations from the optimal ratios μ and e. the side of the rocker arm axis. Distortions of the valve in the longitudinal axis of the engine contribute to an earlier reduction in the tightness of the valve pairs. Redistribution of the valve end material with the formation of a wavy concentric surface, the shape of the contact spot on the rocker arm and the corresponding direction of wear of the saddle chamfer was observed in 43% of the studied connections. Technological means and methods for improving the quality of repair, measuring instruments for accurate study of the parameters of parts and connections of the valve group are given. The results of laboratory and operational tests are presented. A method of gas nitriding with an installation for its implementation has been developed, which provides an environmentally friendly method of low-temperature and high-temperature hardening, obtaining deeper and well-developed layers of the diffusion near-surface zone and reduces training, technological time in the process of strengthening and reducing energy consumption
Nanostructural glass composite coatings
Authors: Kharchenko S.D. , Kharchenko O.V.
Published: July 2022

The results of the study of glass-composite nanostructured self-lubricating coatings are presented. The developed glass composite is an antifriction material with an ultrafine structure. The structural components of these coatings significantly affect the graphitization process and provide an antifriction surface layer of α-graphite. The formation of this layer makes it possible to significantly minimize the contact parameters in the friction region.

The developed antifriction nanostructured glass-ceramic self-lubricating coatings containing magnesium carbide and structural components that promote surface graphitization do not contain expensive and scarce components, meet environmental safety requirements, and have high performance characteristics. A significant effect of aluminoborosilicate in the form of a glass phase on the tribological properties of coatings is noted. An increase in adhesive strength is achieved by forming a surface layer of glassy sodium silicate. Using X-ray phase analysis, it was found that the intercalating elements in the subsurface zone-graphite system at the initial stage of the process were Mg2+, Al3+, Cu2+ ions, which randomly penetrated into the interlayer space of the graphite matrix. At sliding speeds of more than 3.0 m/s, intercalates of binary molecular compounds of these elements with oxygen were found in the layered system of graphite. Their intercalation is accompanied by a sequence of repetitive stages, which are reversible with a change in tribological parameters and are characterized by a specific transformation of the structure and, above all, by an increase in the distance between layers due to the influence of various types of interlayer defects and the introduction of intercalants.

The presence of near-surface particles in the graphite layer does not affect the tribotechnical characteristics of the coatings. The developed glass-composite nanostructured self-lubricating coatings have high antifriction characteristics throughout the entire load-speed range
Estimation of tribotechnical parameters of composite polymer with metal filler
Authors: Skvortsov О.О. , Mikosianchyk О.О.
Published: July 2022

Р

The use of composition material based on the polyamide (caprolon) Ertalon 4.6 as an anti-friction material in the sliding units in the aviation industry is considered. Low carbon electrotechnical sheet steel 21864 of different concentrations was used as filler of composite material. The article presents the thermal calculation of plain bearings with polymer insert in different operating modes. It is determined that the addition of a metal filler to polyamide causes a temperature decrease in the friction zone due to the effective heat exchange from the shaft to the bearing housing. The article conducts a study of tribo-technical properties of the proposed composite material on installation PT-4C under sliding conditions according to the scheme “cylinder-plane”, as well as modeling of the support unit in the software complex DS SolidWorks. It has been experimentally determined that the addition of finely dispersed steel filler enhances the antifriction properties of the Ertalon 4.6 polymer and extends the temperature range of the composite insert performance. Increasing the filler concentration to 20% results in a reduction of the friction coefficient by an average of 3.6 times and an increase in the temperature range of composite material use to 100 °C. The load-bearing capacity of the composite material bushing is increased to 25 MPa at a 20% filler concentration respectively.

The practical significance of the work lies in the analysis of the antifriction properties of the polymer with metallic filler in comparison with the polymer without filler, which will prove the effectiveness of the use of such polymers in friction units instead of non-ferrous metals (bronze, babbitt).
Creation of new technological methods for surface engineering based on broaching
Authors: Shepelenko I.V. , Posviatenko E.K. , Nemyrovskyi Ya.B. , Cherkun V.V. , Rybak I.P.
Published: July 2022

The article is devoted to the creation of new processing technologies through the use of drawing. It is determined that the most effective processes of surface engineering of machine parts are hybrid technologies. The advantages of such technologies due to obtaining a new effect from the impact on the part by two or more dissimilar processes belonging to one or different groups of surface engineering methods are noted. It is proved that the use of hybrid technologies on the basis of stretching allows to combine the advantages of different methods, first of all cold plastic deformation methods, in combination with others. The use of deforming drawing provides in the surface layer favorable for the part of the compressive residual stresses, increase the wear resistance of the surface, as well as the strength of the part. The results of the research allowed to classify the deforming drawing as a class of surface engineering methods. On the example of processing of cylinder liners of internal combustion engines the combined technology containing operations of deforming drawing and finishing antifrictional non-abrasive processing is developed. It is shown that the use of deforming drawing has significantly improved the quality of antifriction coating. The use of deforming drawing to the component of the hybrid method with the subsequent pulsed nitriding is considered.It is established that when nitriding cutting tool products, hybrid process modes should be set in order to create the most effective nitride zone. In the case of processing of road vehicle parts, special attention should be paid to obtaining a diffusion layer. The efficiency of the offered technologies on the basis of stretching is established. Determining the prospects for further use of deforming drawing as an integral part of hybrid technologies
Seguimento de pacientes com câncer da mama após tratamento curativo: uma questão ainda indefinida de custo-benefício
Authors: Faria Sérgio Luiz
Published: July 2022

A forma de seguimento de pacientes com câncer da mama é assunto controverso. Há enorme variação entre profissionais sobre quais exames solicitar e a periodicidade das consultas. Do ponto de vista de controle loco - regional, deve-se orientar a paciente para o auto-exame das mamas e consultas a cada 4 a 6 meses com mamografia anual, formando um conjunto de orientações consensual e eficiente. O aspecto menos definido refere-se à pesquisa de metástases hematogênicas de rotina em pacientes tratadas, curadas e assintomáticas. Este assunto tem sido recentemente discutido com opiniões bem antagônicas. Aparentemente, a solicitação de vários exames de laboratório e radiológicos de rotina consegue fazer diagnósticos de falha um pouco mais precocemente, mas não há mudança na sobrevida. A solicitação destes exames de rotina tem um custo alto, quando se leva em conta o enorme número dessas pacientes ansiosas e as próprias pacientes em um estudo randomizado dizem preferir um seguimento mais distante ou quando sintomáticas. Pelo menos dois estudos com pacientes assintomáticas seguidas com exames usuais de rotina, versus seguimento mais orientado por queixas, mostram que a sobrevida foi igual. Para pacientes que não participam de estudos prospectivos, a maioria dos casos, o seguimento com exame clínico e solicitação de exames basicamente quando os sintomas exigirem é uma boa alternativa quando se considera custo/benefício.
Negação e estigma em pacientes com câncer de mama
Authors: Quintana Alberto Manuel , Santos Luis Humberto R. , Russowsky Irene L. T. , Wolff Leila Regina
Published: July 2022

Este trabalho parte da afirmação da existência concomitante de um corpo biológico e um corpo psicológico. A partir dessa concepção, busca-se analisar as dinâmicas geradas pelo diagnóstico de câncer de mama e pela mastectomia na busca da compreensão de como essa doença e o referido tratamento afetam a imagem corporal das doentes, considerando-se o lugar especial que o seio ocupa no universo de representações femininas. No trabalho são visualizados também os mecanismos que as pacientes utilizam como tentativas de lidar com as angústias, bem como as modificações que os mesmos desencadeiam em suas vidas e as repercussões no tratamento. Na sequência são analisados os diferentes tipos de reação frente à confirmação do diagnóstico de câncer de mama, tanto por parte da paciente como do seu círculo familiar, o qual é também afetado e tem portanto, um papel relevante na construção das diferentes representações da doença.
Pengaruh Healty Lifestyle, Perceived Quality dan Perceived Value Terhadap Keputusan Pembelian Sepeda Jenis Roadbike Merk Polygon
Authors: Lutfi Farid Zain , Baehaqi Muhammad
Published: July 2022

Penelitian ini bertujuan untuk mengetahui pengaruh healthy lifestyle, perceived quality, dan perceived value terhadap keputusan pembelian sepeda jenis roadbike di Kabupaten Kebumen. Data sampel yang diambil dalam penelitian ini yaitu pengguna sepeda jenis roadbike di Kabupaten Kebumen yang berjumlah 100 orang sebagai responden. Instrumen atau alat pengumpulan data dalam penelitian ini menggunakan angket/kuisioner. Alat analisis dalam penelitian ini yaitu menggunakan analisis regresi linier berganda. Teknik analisis data yang digunakan dalam penelitian ini antara lain analisis kualitatif dan analisis kuantitatif yang terdiri dari uji validitas, uji reliabilitas, uji t, uji f, uji regresi linier berganda (skala likert). Data dianalisis menggunakan SPSS 25 for windows. Dari hasil membuktikan hipotesis pertama bahwa healthy lifestyle secara parsial memiliki pengaruh signifikan terhadap keputusan pembelian. Dari hasil hipotesis kedua membuktikan bahwa perceived quality berpengaruh signifikan terhadap keputusan pembelian. Dari hasil hipotesis kedua membuktikan bahwa perceived value berpengaruh signifikan terhadap keputusan pembelian. Dari hasil hipotesis keempat membuktikan bahwa healthy lifestyle, perceived quality, dan perceived value secara simultan atau bersama-sama berpengaruh signifikan terhadap keputusan pembelian.
Prone spine surgery in a morbidly obese patient: Anesthesia challenges and management
Authors: Latkar Prajakta , Kaushik Prajwala , Prabhudesai Aaditya , Mehta Hemant
Published: July 2022

India is seeing a rapid epidemiological transition from underweight to overweight, with an overall prevalence of obesity reported to be 40.3%. Anesthesiology concerns in an obese patient are well known. We elaborate on the anesthesia management in a 68-year-old male patient with a body mass index of 66.3 kg/m2 who underwent spine surgery in prone position. Challenges faced ranged from the size of the table to the difficult airway, difficulty in positioning, maintenance of airway and ventilation, maintaining a free abdomen, and anesthesia management with meticulous use of anesthetic drugs for an uneventful recovery.
Jugular foramen schwannoma: A rare tumor treated by stereotactic radiosurgery
Authors: Bansal Manishi , Jindal Ankush , Jindal Anupam , Das P Mohan
Published: July 2022

Jugular foramen schwannomas (JFS) are rare benign tumors located in the jugular foramen. They can present with various symptoms depending on the extent of involvement of the tumor such as hearing loss, tinnitus, headache, and ataxia. Surgical resection has been considered as the primary treatment option for JFS. Stereotactic radiosurgery (SRS) offers an equally good treatment in patients with small and residual tumors after surgery with the advantage of being non-invasive with minimal complication rates. Herein, we present a rare case of JFS treated by SRS in our institution.
Laparoscopic management of pelvi-ureteric junction obstruction caused by aberrant renal vessels in an adult
Authors: Sangoi Chintan , Shetty Prakashchandra , Joshi Abhijit
Published: July 2022

Pelvi-ureteric junction obstruction is not a rare clinical entity. It is indeed one of the common urological conditions presenting most commonly as hydronephrosis and pain. The most common etiology for patients suffering from acquired pelvi-ureteric junction obstruction is the presence of calculus/calculi. An aberrant renal vessel (now termed as Vascular bar) is one of the causes in adults which is often missed on pre-operative investigations and is detected intra-operatively. We present herein, a case report of a 28 years old female who came with complaints of loin pain since 2 to 3 months. The workup investigations revealed only hydronephrosis without any calculi. Thus a diagnosis of primary pelvi-ureteric junction obstruction was made. The patient was successfully managed by a laparoscopic pyeloplasty.

                Keywords : PUJ obstruction, Vascular bar, aberrant renal vessel, laparoscopic pyeloplasty
Planification fiscale personnelle : Les enjeux pour les bénéficiaires américains de successions canadiennes
Authors:   KPMG LLP, Toronto, Ayub Tanzeela , Pereira Michael ,   KPMG LLP, Toronto
Published: July 2022

Cet article donne un aperçu des questions fiscales américaines auxquelles sont susceptibles d'être exposées les successions étrangères dont les bénéficiaires sont des particuliers américains. Même si les familles peuvent mettre en œuvre des stratégies de planification pour gérer efficacement le transfert de patrimoine du point de vue national, les lois fiscales américaines peuvent créer des problèmes complexes et entraîner des conséquences négatives pour les imprudents. Cet article vise à présenter les considérations générales sur la fiscalité américaine pour une succession étrangère, y compris l'application possible des règles anti-report d'impôt régissant les sociétés de placement étrangères passives (SPEP) et les sociétés étrangères contrôlées (SEC). L'article comporte une étude de cas qui illustre comment ces règles peuvent s'appliquer aux bénéficiaires américains d'une succession canadienne si celle-ci détient des actions d'une SPEP ou d'une SEC. Il propose également quelques lignes directrices et stratégies pour réduire les conséquences américaines potentiellement néfastes et atténuer certains risques fiscaux.