bluuebunny/crossref_metadata_2025 huggingface dataset:
Weight optimization of steel lattice transmission towers based on Differential Evolution and machine learning classification technique
Authors: Nguyen Tran-Hieu , Vu Anh-Tuan
Published: December 2021

Transmission towers are tall structures used to support overhead power lines. They play an important role in the electrical grids. There are several types of transmission towers in which lattice towers are the most common type. Designing steel lattice transmission towers is a challenging task for structural engineers due to a large number of members. Therefore, discovering effective ways to design lattice towers has attracted the interest of researchers. This paper presents a method that integrates Differential Evolution (DE), a powerful optimization algorithm, and a machine learning classification model to minimize the weight of steel lattice towers. A classification model based on the Adaptive Boosting algorithm is developed in order to eliminate unpromising candidates during the optimization process. A feature handling technique is also introduced to improve the model quality. An illustrated example of a 160-bar tower is conducted to demonstrate the efficiency of the proposed method. The results show that the application of the Adaptive Boosting model saves about 38% of the structural analyses. As a result, the proposed method is 1.5 times faster than the original DE algorithm. In comparison with other algorithms, the proposed method obtains the same optimal weight with the least number of structural analyses.
The influences of the number of concrete dowels to shear resistance based on push out tests
Authors: Vu Anh-Tuan , Han Ngoc-Duc , Nguyen Kien , Nguyen Dinh-Hoa
Published: December 2021

To reduce the depth of floor-beam structures and to save the cost of headed-shear studs, many types of shallow composite beam have been developed during the last few years. Among them, the shallow-hollow steel beam consists of web openings, infilled with in-situ concrete (named concrete dowel) has been increasingly focused recently. In this new kind of structure, this concrete dowel plays an important role as the principal shear connector. This article presents an investigation on the shear transferring mechanism and failure behavior of the trapezoid shape concrete dowel. An experimental campaign of static push-out tests has been conducted with variability in the number of web openings (WOs). The results indicate that the mechanical behavior of concrete dowel could be divided into crushing, compression, and tension zones and exhibits brittle behavior. The longitudinal shear resistance and specimen's stiffness are strongly affected by the number of considered WOs
Optimization of a reinforced concrete structure subjected to dynamic wind action
Authors: Brito Jherbyson , Miguel Letícia
Published: December 2021

This work proposes a methodology to optimize a reinforced concrete structure. For this, the Whale Optimization Algorithm (WOA) algorithm was used, an algorithm from the group of metaheuristic algorithms, which presents an easy computational implementation. As a study object, a frame structure adapted from a real reinforced concrete building was used, subjected to the dynamic action of artificially generated synoptic wind. The objective function is to reduce the volume of concrete of the structure. For that, the dimensions of the cross-sections were used as design variables, and the maximum displacement at the top imposed by the ASCE / SEI 7-10 standard as a lateral constraint, as well as the maximum story drift between floors. In addition to this structural optimization, it was also proposed the use and optimization of Tuned Mass Dampers (TMD), in different quantities, positions and parameters, improving the dynamic response of the reinforced concrete building. The results show that for this situation it was possible to reduce the concrete volume of the structure by approximately 24%, respecting the maximum limit of displacement at the top required by the standard.
Experimental contribution to the study of the physic-mechanical behavior and durability of high-performance concretes based on ternary binder (cement, silica fume and granulated blast furnace slag)
Authors: Rahim Ouahab , Achoura Djamel , Benzerara Mohammed , Bascoulès-Perlot Céline
Published: December 2021

Le béton à hautes performances (BHP) est un béton innovant largement utilisé dans la construction moderne. De nouvelles techniques de formulation et de conception du HPC ont permis d'obtenir des performances mécaniques et une durabilité remarquables par rapport au béton conventionnel. Les principaux avantages du HPC sont liés à sa faible porosité, sa très haute résistance mécanique et son excellente durabilité. La facilité d'application du HPC est obtenue par l'utilisation combinée de superplastifiant et d'ajout de minéraux, ce qui se traduit par une augmentation significative de la résistance à la compression tout en améliorant la maniabilité et la durabilité. L'utilisation d'un liant ternaire (ciment, fumée de silice et laitier granulé de haut fourneau broyé) dans la fabrication du HPC est une nouvelle avancée dans la construction durable qui offre des avantages économiques, techniques et écologiques. L'objectif de ce travail de recherche était d'améliorer les propriétés physico-mécaniques du HPC à base de liant ternaire en étudiant l'influence du remplacement du ciment par du laitier granulé et des fumées de silice. Les résultats des tests mécaniques montrent que les performances du HPC réalisé avec ces liants ternaires sont similaires au HPC témoin sans laitier granulé. Enfin, il est conclu que l'utilisation de tels liants est très bénéfique pour diminuer les problèmes environnementaux et améliorer la durabilité du HPC.
Numerical study of TRIP transformation in 35NCD16 steel-effects of plate orientation and some criteria
Authors: Gaci Mounir , Kamel Fedaoui , Baroura Lazhar , Talhi Amar
Published: December 2021

This study aims to analyze the effect of thermo mechanical coupling damage in the presence of a phase change (austenite/martensite) in 35NCD16 steel. The impact of increasing mechanical traction load, accompanied by a martensitic transformation on the scale of a single grain with boundary has been studied. The prediction transformation of induced plasticity (TRIP) was evaluated by taking into account the following parameters: twenty shear directions of the martensitic plates, two values of the shear deformation of the martensitic plates, energetic and thermodynamics criteria for getting in order the transformation of the martensitic plates, elastoplastic behavior of the two areas in the first case (martensitic plate and grain boundary) and elastic behavior for the grain boundary in the second case. The numerical calculation is carried out using the finite element method (FEM), implemented in the Zebulon calculation code. The developed approach is validated using the available experimental results reported in the literature. The numerical results showed that the estimation of TRIP given by the energetics criteria with the values of the shear deformation (γ0 = 0.16) are closer to the experiment results.
Self-healing mortar using different types, content, and concentrations of bacteria to repair cracks.
Authors: Ahmed Refat El-Mahdy Mohamed , ELShami Ahmed , Yousry Elshikh Mohamed , Saleh Elsayed Ahmad Seleem
Published: December 2021

The creation of cracks, which are the most common cause of structural failure, has a significant impact on the structure's strength and durability. As a result, effective repair and maintenance are vital and unavoidable for treating any of these issues. Self-healing mortar holds promising benefits for reducing the cost of repair as cracks are autonomously repaired without any human intervention. This study investigated the effect of bacteria type, bacteria content, bacteria concentration, and nutrient type on the properties of the self-healing mortar. Three types of bacteria, Bacillus sphaericus, Bacillus Megaterium, and Bacillus subtilis encapsulated in calcium alginate beads, were introduced into the mortar. Two concentrations of bacteria, 2× 108 and   2× 109 Colony Forming Units per milliliter, and different percentages of bacteria of cement weight were selected for the study. In addition, calcium lactate and calcium acetate were used at 0.5% of cement weight as nutrition for bacteria. Tests were performed for compressive strength, bending strength, SEM, EDX, and TGA/DTG. The results show a significant development in the mechanical behaviour of mortar, especially with Bacillus Megaterium using a 2.5% bacterial proportion with a concentration 2× 109 CFU/ml. This can be related to the filling of voids and cracks in microbial mortar by calcite, which was confirmed by SEM and EDX.
Influence of the interphase between laser-cladded metal layer and steel substrate on fatigue propagation of a short edge crack
Authors: Malikova Lucie , Doubek Pavel , Miarka Petr , Seitl Stanislav
Published: December 2021

Laser cladding is a relatively new technology how to combine properties of various materials. Thus, bi-material interfaces are presented in real structures and can affect the fatigue crack propagation. A cracked bar subjected to pure tensile loading is numerically simulated in this work in order to analyze the effect of the interphase layer between the cladded metal layer and the steel substrate on crack growth in the surface layer. Particularly, the influence of various Young’s modulus of the interphase on the stable/unstable edge crack propagation is assessed. Moreover, the number of cycles necessary for achievement of the defined critical crack length is calculated and it is summarized that knowledge of elastic properties of the thin interphase is crucial for fracture and fatigue analyses.
New requirements for technical acceptability of construction products as a component of the construction quality assurance system
Authors: Lytvynenko O.
Published: December 2021

The analysis and generalization of theoretical approaches to the formation of the construction quality system, the generalization of the legislative and regulatory framework for quality control in construction. Analysis of the theoretical prerequisites for the formation of quality control of construction revealed that the digital transformation of construction is an integral part of the development of modern society, a prerequisite for changing the system of construction, including control, quality assurance and evaluation of construction processes, works, materials, products and structures.

It was found that the quality in construction is directly affected by the following factors: quality and completeness of design documentation; the possibility and obligation to comply with legal requirements; quality of construction processes and works, strict compliance with the requirements of technology and construction organization; quality of construction products and structures; technical ability to provide a given level of quality with the help of machines, mechanisms, means of small mechanization, etc .; the level of qualification of management staff, workers and line ITP. The quality system itself can be presented in the format of a "black box", where the factor will be named at the entrance, and at the exit - buildings and structures that meet a given level of quality throughout the life cycle of the object.

It is proposed to consider the construction quality management system in the form of a multicomponent formation and at the same time a dynamic environment, which is constantly changing under the influence of external and internal factors and has a high degree of scholasticism and uncertainty. With the introduction of digital technologies in the organization of construction, including VIM modeling, use of artificial intelligence, cloud services for information storage, quality control tools that can be performed without human intervention, such as drones, robotic elements, surveillance cameras and others, the construction quality assurance system has to change, taking into account the realities of time. Therefore, the system of quality formation in the article is proposed to be considered throughout the life cycle of the object - from pre-project research to liquidation. This will, in contrast to existing approaches, not only combine into a single system all the components of assurance, evaluation and quality control, which are used at the level of all participants in the construction, but also to ensure integrated process management.
Problems and disadvantages of the existing evaluation system of thermomodernization projects of construction objects
Authors: Vahovich І.V. , Maximov A.S. , Ostapenko І.О. , Bogatyuk D.V. , Kalashnikov D.P.
Published: December 2021

The article considers the topical issue of thermal modernization of residential buildings and social facilities is an important area of research, but in the implementation of such projects there are many obstacles of organizational and administrative nature, which currently hinder the implementation of projects to improve energy efficiency of buildings and structures. and the systematization of which will allow to develop measures to eliminate existing barriers, and thus improve the attractiveness and accessibility of thermal modernization projects for the population and other stakeholders.

The main stages of thermal modernization are systematized in accordance with the provisions of the current legislative and regulatory framework, the place of thermal modernization measures in the sequence of implementation of investment and construction projects is determined.

It is determined that the main types of construction in which thermal modernization is carried out are capital repairs, reconstruction and technical re-equipment, but thermal modernization measures can be carried out during the current repair. Current repairs are not a type of construction, and therefore it is not subject to laws and regulations in the field of construction, and therefore the organization and implementation of such works from the standpoint of the requirements of legislation and regulations is the simplest.

The following obstacles and barriers were identified during the development of the thermal modernization project, namely: the order of performance of the technical condition survey and energy audit is not legally established (in practice these are two unrelated actions, the result of which are not related technical reports analyzed by the designer. design), the stages of thermal modernization are not linked to a single methodology, given in separate documents, and therefore require special professional knowledge, not sufficiently reflected stages of preparation of thermal modernization at the stage of pre-design work, while at this stage decisions must be made , providing the required level of energy efficiency for the customer, technical and economic indicators of the project.
Effects of Rhythmic and Simple Auditory Stimulations on Learning the Timing of Sequential Motor Task in Children With DCD
Authors:   Department of Motor Behavior, Faculty of Sport Sciences, Ferdowsi University of Mashhad, Mashhad, Iran., Dehnavi Ahmad , Saberi Kakhaki Alireza ,   Department of Motor Behavior, Faculty of Sport Sciences, Ferdowsi University of Mashhad, Mashhad, Iran., Taheri Torbati Hamidreza ,   Department of Motor Behavior, Faculty of Sport Sciences, Ferdowsi University of Mashhad, Mashhad, Iran., Shahabi Kaeb Mohammadreza ,   Faculty of Physical Education and Sport Sciences, Hakim Sabzevari University, Sabzevar, Iran.
Published: December 2021

Introduction: Children and adolescents with Developmental Coordination Disorder (DCD) usually fail to understand spatial awareness and motor timing. The present study assessed Rhythmic Auditory Stimulations (RAS) and Simple Auditory Stimulations (SAS) to facilitate the learning of timing in sequential motor task and recorded the results of their relative and absolute timing errors. Materials and Methods: 56 male students aged 9-12 years with DCD in Neyshabur city were selected by diagnosing with the following tools: Teacher Motor Inventory, Parental Developmental Coordination Disorder Questionnaire, Movement Assessment Battery for Children-Second (MABC-2 movement test), spatial-visual memory assessment, intelligence assessment, RT test, and biopsychological health status evaluation. Then, they were divided into RAS, SAS, control group 1 (visual), and control group 2. Moreover, a pretest score was performed. Next, the training protocol was presented in 10 blocks of 5 attempts and the acquisition test was performed. Finally, the retention and transfer tests were performed after 48 hours and 10 minutes, respectively. Results: Based on the obtained results, a significant difference was observed between the visual stimulation group and the RAS and SAS groups in relative and absolute timing components (P≤0.05). However, no significant difference was reported between the rhythmic, SAS, and visual-auditory stimulation groups in relative and absolute timing variables (P˃0.05). Conclusion: Finally, no significant difference was observed between the RAS and simple stimulations although the graphs displayed the effect of the first stimulation more than that of the second one.
The Effect of Eccentric Retraining on Sensation of Muscle Pain and Delay Onset Muscle Soreness Markers on Sedentary Young Men
Authors:   Department of Exercise Physiology, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran., Forutan Ghojebiglo Ali , Siahkohian Marefat ,   Department of Exercise Physiology, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran., Fasihi Leila ,   Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, Allameh Tabatabaii University, Tehran, Iran.
Published: December 2021

Background and Aims Due to the concerns among trainers about relieving muscle pain as soon as possible, this study aimed to investigate the effect of eccentric retraining on muscle pain and Delay Onset Muscle Soreness (DOMS) markers in sedentary young men. Methods In this study, sixteen inactive healthy young men voluntarily and after written informed consent. Subjects were randomly divided into control (n=8) and experimental (n=8) groups. Both groups performed seventy eccentric contractions in the flexor elbow muscles with 80% of maximal repetition. Muscular pain perception, serum levels of Creatine Kinase (CK), and Lactate Dehydrogenase (LDH) indices were measured before, one, 26, 48 and 72 hours after eccentric training. Independent t-test and Repeated measure analysis variance in the significant level of P≤0.05 used for data analysis. Results The sensation of muscle pain and creatine kinase in both groups increased significantly after exercise (P≤0.05), lactate dehydrogenase level was increased in both groups. Still, this increase was not significant (P>0.05). Also, no significant difference in the CK and LDH and pain perception in the measurement stage between the two groups was observed (P>0.05). Conclusion This study results showed that retraining isn’t an essential influential variable on muscle pain and DOMS markers. However, more research needs to be done in this area.
On Dependency between Wishes and Perception
Authors: Ponomarev A. I. , Frolov K. G.
Published: December 2021

Introduction. Empirical studies of recent years convincingly show that the character of sensory perception can be influenced by non-cognitive mental states of the agent, such as her desires. The aim of the paper is to analyze how this causal connection between agent's wishes and her sensations can affect the epistemological status of dependent sensations.

Methodology and sources. The author examines S. Siegel's argument on this issue. S. Siegel argues that the empirically proven dependence of sensations on desires (wishful seeing) should lead to a decrease of the epistemological status of sensations to the same extent as the dependence of beliefs on desires (wishful thinking) leads to a decrease of the epistemological status of these beliefs. Thus Siegel's argument concludes that the phenomenon of wishful seeing deprives us of any reason to accept sensations as credible evidence of the states of the world. So, this is an argument in favor of skepticism.

Results and discussion. The article discusses two main strategies for rejecting Siegel's argument. According to the first strategy proposed by R. Long, sensations are not so similar to beliefs that one can conclude that their epistemological status should be decreased on the basis of their dependence on desires. According to another strategy for refuting Siegel's argument, proposed by A. Raftopoulos, the influence of desires on perception does not extend to early vision. Early vision is free from the influence of higher order conscious mental states. The dependence of the results of sensory perception on other mental states is reduced to the influence of these states on the agent's attention. At the same time, attention can be volitionally controlled and can be trained. Therefore dependent perception under certain conditions can be rationally accepted.

Conclusion. Thus, the article shows that, even though perception is dependent on other non-cognitive mental states, such as desires, this dependence does not necessarily lead to a decrease in the epistemological status of sensations, so sensations can be rationally accepted under certain conditions. This means that Siegel's argument for skepticism is not compelling.
CHOICE OF LOCOMOTIVE PARK MAINTENANCE STRATEGY WHEN INTRODUCING THE SERVICE
Authors: Puzyr V. , Krasheninin O. , Datsun Y. , Obozny O. , Shapatina O. , Zadesenets V.
Published: December 2021

In operation, sometimes there are situations of uncertainty in assessing the technical condition of locomotive equipment and at the same time choosing the optimal strategy for its maintenance, including the possibility of using the service. Application of the concept of service gives the chance to stimulate work of all divisions of locomotive economy, to save all kinds of resources for operation of locomotives. According to this, the article substantiates the choice of strategy for maintaining the locomotive fleet using the provisions of the theory of statistical solutions. Game theory approaches were used to theoretically substantiate the transition to a service for decision-making in conflict situations and to determine the optimal strategy of behavior of each of the participants in this situation. Approaches to the choice of strategy for the maintenance of the locomotive fleet during the introduction of the service on the basis of the provisions of the theory of strategic games on the criterion of maximum efficiency were considered. It is shown on examples of the decision of some problems of a choice of maintenance strategy of locomotives for various industrial situations. It is concluded that a mixed strategy describes different situations best and allows to made rational decisions. It is also noted that the most effective approach to concretize the algorithm of actions is the complex application of the theory of strategic decisions, the theory of fuzzy sets, the theory of pattern recognition.
SCIENTIFIC APPROACH TO THE METHODS OF INCREASING THE LIFE CYCLE OF WHEELS OF RAILWAY VEHICLES
Authors: Sapronova S. , Tkachenko V. , Braikovska N. , Zub Y.
Published: December 2021

The value of the life cycle of rolling stock wheels is determined by the frequency of maintenance, in the process of which the turning is carried out to restore the profiles of the rolling surfaces, or the replacement of completely worn wheels. Traffic safety depends on the technical condition of the wheels of locomotives and wagons. Maintenance and repair of wheelsets accounts for about 30% of all costs of Ukrzaliznytsia's rolling stock repair units. Wheel repair technologies are based on the complete restoration of wheel profiles by turning, using which, their life cycle is reduced, and costs increase by 20% or more. The railways of Ukraine use an outdated, unreasonable, inefficient system of control over the formation of rolling surfaces in operation. Therefore, there is a need to create a scientifically sound approach to methods of extending the life cycle of the wheels of locomotives and wagons while ensuring the safety of railway rolling stock. According to the proposed scientific approach, the wheel profile is restored to optimal parameters, which provides an extended life cycle of wheelsets. As a result of the developed scientific approach the life cycle of wheel pairs will increase by 15… 25% and the expenses of the railway for their repair will considerably decrease.
COMBINATORY APPROACH TO FAILURE FINDING IN PASSENGER CAR ELECTRICAL EQUIPMENT SYSTEM
Authors: Lovska A. , Fomin O. , Skurikhin D. , Bondarenko V.
Published: December 2021

Maintaining a high level of maintenance of electrical equipment in passenger cars requires research in the field of improving methods and means of technical diagnostics. Electronic devices for automatic control and protection, which are located in the switchboard of the car, are one of the most critical elements in the electrical equipment system, ensuring its reliable, efficient and safe operation. If the automatic adjustment and protection devices are out of regulation during operation, the voltage and current in the electrical equipment network may exceed the permissible level, which leads to the failure of electricity consumers, a battery and a generator. In addition, the semiconductor devices themselves are very sensitive to short-term overloads, in which, even with minor overloads, a breakdown or breakage of the conductive layer occurs. Modern trends in the development of passenger car fleet indicate a sharp increase in the complexity of the element base of cars. This mainly concerns the electrical systems of cars, where all the functions of control, monitoring and diagnostics are performed by electronics. Maintaining a high level of service for such systems requires research in the field of improving methods and means of technical diagnostics. For these purposes, the authors have developed a method for constructing optimal control and diagnostic tests, which is based on a combinatorial approach. The method is easily implemented on a computer.
PRODUCTION OF THE SORPTION SHEET FROM COMPOSITE MATERIALS AS A LIQUIDATION AGENT FOR SPILL RESPONSE OF HAZARDOUS MATERIALS ON TRANSPORT
Authors: Zelenko J. , Kalimbet M.
Published: December 2021

The article raises the issues of rail transport in many countries, including the European Union and Ukraine, transportation of various classes of dangerous goods, ensuring safety during their transportation, strengthening technical standards and environmental requirements for safety of dangerous goods transportation by all modes of transport and the problem of localization and liquidation of accidents during transportation of various classes of dangerous goods by rail is raised. Methods and methods of localization and elimination of spills of dangerous goods are discussed, the sorption method is described as the chosen method to solve the problem, a brief description of sorbents is given, various variants and modifications of materials for carbon sorbents are presented, materials will be used for universal sorption web, method of obtaining a universal sorption web, demonstrated a special installation for carbonization (Carbonizer), which was slightly modernized and made by the authors according to the design of the Engels University. The method of conducting experiments is described. The characteristics of the universal sorption web, its sorption properties are given, and also the technique of using the universal sorption web as a means for localization and / or liquidation of liquid hazardous substances of 3, 5, 8 hazard classes is proposed.
JUSTIFICATION OF FILLERS USING IN THE BEARING STRUCTURES COMPONENTS OF FREIGHT CARS
Authors: Panchenko S. , Fomin O. , Vatulia G. , Lovska A. , Deryzemlia S. , Rybin A.
Published: December 2021

To reduce the load on the freight cars frames under operational conditions, it has been suggested that to use fillers in their components. Fillers using is advisable in the most loaded elements of the bearing structure, namely, the spine beam. Therefore, a necessary condition for filler using in the spine beam is the creation of its closed structure. The dynamic load of railcars was carried out, taking into account the proposed provisions. Calculations have shown with filler using, the maximum accelerations acting on the bearing structures of wagons are 4% lower than those accelerations obtained for bearing structures without fillers. The results of determining the main strength indicators of bearing structures of freight cars are presented, taking into account the fillers using in their components. It has been established that the strength of the frames of the considered types of wagons under the main operating conditions is ensured. At the same time, the maximum equivalent stresses in the bearing structures of wagons are 4-9% lower than those in typical frame structures. The conducted research will contribute to the creation of innovative structures of rolling stock and reduce the cost of its maintenance work in operation.
STUDY OF PERFORMANCE INDICATORS OF TRANSPORT MACHINE-BUILDING AND RAILWAY INDUSTRY ENTERPRISES IN A PANDEMIC CONDITION COVID-19
Authors: Sulym A. , Safronov O. , Gladkykh I. , Lupitko N.
Published: December 2021

The article analyzes the impact of the consequences of the quarantine measures introduction to counter the pandemic COVID-19 on the economy of Ukraine in general and the domestic transport machine-building sector in particular. It has been established that one of the most affected sectors of the economy is transport and mechanical engineering, in particular the railway transport sector. It is determined that at present a very relevant issue for the further development of domestic enterprises of transport machine-building and railway industry is the assessment of the impact of the COVID-19 pandemic on the activities and financial and economic performance of these enterprises. The financial and economic indicators of such domestic enterprises of transport machine-building and railway industry, such as JSC "Ukrzaliznytsia", PJSC "KVBZ", SE "UkrNDIV", LLC "LEMTRANS" and LLC "KERNEL-TRADE", TDV "Popasnyansky Car Repair Plant" are analyzed. It was determined that the most affected of the studied domestic enterprises under the conditions of quarantine measures were JSC "Ukrzaliznytsia", PJSC "KVBZ", TDV "Popasnyansky Car Repair Plant". The main reasons for the decrease in technical and economic indicators at domestic enterprises of transport machine-building and the railway industry are studied by the method of expert evaluation. According to the analysis of expert evaluation data, the most important reason for the deterioration of technical and economic indicators of enterprises is the lack of state support and incentives for the development of transport machine-building and the railway industry in the country (19.6%). Experts estimate the impact of the consequences of the introduction of quarantine measures to counter the COVID-19 pandemic at 8.1%. Measures are proposed to improve the technical and economic performance of the most affected domestic enterprises of the transport machine-building and railway industries in the context of the COVID-19 pandemic.
MANAGEMENT STRATEGIES FOR ENERGY PROCESSES IN ELECTRIC ROLLING STOCK WITH ON-BOARD ENERGY STORAGE DEVICES
Authors: Sulym A. , Khozia P.
Published: December 2021

The article deals with the main existing strategies for management strategy of energy exchange processes in the electric rolling stock with onboard capacitive energy storage devices. When considering strategies, it is assumed that the onboard capacitive storage has low power and capacitance. Therefore, this capacitor storage is not able to accept the full amount of regenerative braking energy of the electric rolling stock. The purpose of the paper is to consider and analyze management strategies for energy exchange processes in the electric rolling stock with onboard capacitive energy storages; to define the advantages and disadvantages of each of the existing strategies and propose a concept for the effective management of energy exchange processes in the electric rolling stock. The block diagram of electric rolling stock with the onboard capacitive energy storage which is used for the analysis of management strategies for energy exchange processes is presented. The modes of operation of electric rolling stock with onboard capacitive energy storages are described. Five main strategies for management of energy exchange processes on the electric rolling stock with onboard capacitive energy storages are determined. The advantages and disadvantages of each strategy are set out taking into account the given conditions (characteristics of the electric rolling stock, conditions of the rolling stock motion, oscillograph charts, etc.). The general advantages and shortcomings of each strategy are defined, which allowed to propose the concept of creating an adaptive strategy for managing energy exchange processes in electric rolling stock with onboard capacitive energy storages. The main concept of this management strategy is to implement efficient energy exchange between the traction equipment, the onboard capacitive energy storage, the overhead contact system, both in normal and emergency modes of traction power supply, taking into account the dynamics of energy exchange processes in the overhead contact system, which will generally allow safety and energy efficiency of the transportation process. The obtained research results will contribute to the development and implementation of effective strategies for managing energy exchange processes in the electric rolling stock.
SIMULATION OF TROLLEBUS STEERING SYSTEM WITH ELECTRIC POWER STEERING BASED ON ROLLING ROTOR SWITCHED RELUCTANCE MOTOR
Authors: Aharkov I.
Published: December 2021

The analysis of power steering which used on modern rolling stock is carried out. Their main shortcomings are identified. Given the requirements for the steering of trolleybuses, a solution to increase its efficiency is proposed. Based on the developed mathematical model and functional diagrams of the trolleybus steering system with a electric power steering based on rolling rotor switched reluctance motor, a simulation model of trolleybus steering was created using the Matlab Simulink package. The peculiarity of the simulation model is taking into account the mass and size characteristics of the rolling stock, the parameters of the suspension of the steered axle, the impact of the road surface and the speed of the trolleybus, changes in the parameters of the electric motor magnetic system during operation. The rolling rotor switched reluctance motor which is offered for use as the electric power steering of the LAZ E183D1 trolleybus is calculated. The calculation of the magnetic system of the engine by the finite element method with the subsequent approximation of the obtained results is carried out. With the help of the developed simulation model the simulation of the trolleybus steering system with electric power steering based on rolling rotor switched reluctance motor was performed. Time diagrams of transients in the trolleybus steering system are obtained and their processing and analysis are carried out.
Proposta de implementação de treinamento para desenvolvimento de competências no setor logístico: estudo de caso na Empresa Gemar Supermercado
Authors: Moura Saulo Roberto da Silva , Roberto José Carlos Alves , Oliveira Daniel Barroso
Published: December 2021

O presente artigo teve como propósito realizar um estudo de caso na empresa Gemar Supermercado, que atua na área de serviços de comercialização varejista e de mercadorias em geral, com dominância de produtos alimentícios. Com base na pesquisa realizada através do diagnóstico organizacional, identificou-se a área da logística como a mais crítica, principalmente, no que se refere à capacitação dos colaboradores. Diante disso, levantou-se o seguinte questionamento: como as políticas de capacitações operativas podem proporcionar melhorias contínuas no processo logístico? O objetivo geral do artigo é propor a implementação de um programa de gestão por competências com práticas e técnicas a fim de aperfeiçoar o desempenho dos colaboradores nos processos logísticos do Gemar Supermercado. A metodologia utilizada na pesquisa foi aplicada e qualitativa, de caráter exploratório, realizando levantamento de dados com colaboradores e gestores. Como resultados, foi proposto um conjunto de ações interventivas que permitem a estruturação de processos de reciclagem constante, visando a melhora da capacidade operativa dos colaboradores que atuam no departamento de logística. As ações foram gerenciadas, em sua introdução, pela ferramenta da qualidade 5W2H. Por fim, concluímos que através das políticas de capacitação e treinamento constante dos colaboradores utilizando estratégias da gestão por competência, é possível que haja melhorias no desenvolvimento logístico do supermercado.
Proposta de implementação de ações para melhorar o clima organizacional a fim de aperfeiçoar a qualidade dos serviços na Clínica: Estudo de caso na Clínica de Olhos Harley Street
Authors: Pires Iverton Daniel Morais , Coelho Victória Rebecca Farias , Oliveira Filho Fábio Augusto de , Almeida Victor da Silva , Roberto José Carlos Alves
Published: December 2021

O exposto artigo teve como objetivo realizar um estudo de caso na Clínica de Olhos Harley Street, atuando no ramo da saúde ocular na cidade de Manaus, a clínica é de médio porte e dispõe de dois pontos de atendimento aos clientes. O objetivo geral da proposta foi descrever como melhorar o desempenho dos serviços prestados pelos colaboradores na clínica por meio da introdução de estratégias para melhoria do clima organizacional. A partir dos resultados e das análises dos estudos realizados nas áreas funcionais da clínica, foi identificado que a área mais crítica da organização é a de recursos humanos, assim, chegou-se a problemática dos impactos do clima organizacional sobre os colaboradores, seguindo a pergunta problema: Como a introdução de estratégias voltadas aos recursos humanos pode minimizar o clima organizacional desarmônico existente na organização? A metodologia empregada se baseou em uma pesquisa descritiva, exploratória realizada através do uso de questionários. As ações interventivas foram aplicadas via ferramenta 5W2H, nas quais objetivaram a implementação da pesquisa de clima organizacional, o estabelecimento da cultura do feedback, a prática da avaliação 360°, planos de treinamento e motivação e a adoção do endomarketing. Espera-se que com essas ações os colaboradores possam desenvolver a relação da gestão com os colaboradores, tornando-os participativos das fases do processo de gestão, a fim de desenvolver suas capacidades e promover o engajamento das equipes, assim, tornando o clima organizacional como diferencial competitivo.
Cortexo de honra a Curros Enríquez
Authors:   Real Academia Galega
Published: December 2021

No mes de abril de 1908 un acto multitudinario percorre as rúas da cidade, as masas corais, con estandartes e pendóns despregados, inzan os seus versos nas ás da música; presidido polas autoridades políticas e académicas, polo mundo societario dunha e outra ribeira, o pobo enseñórase de camiños e rúas para acubillar o poeta que lle deu voz e vida.
Homenaxe aos Mártires de Carral
Authors:   Real Academia Galega
Published: December 2021

O 26 de abril de 1846, logo dun sumarísimo e irregular xuízo, foron fusilados en Carral o Comandante D. Miguel Solís e once oficiais. Concluía así o levantamento iniciado o 2 de abril na cidade de Lugo. Cando xa foron varridos, como po da historia, os nomes dos executores, nós seguimos a honrar a memoria daqueles que constituíron a primeira xeración galeguista e a vivir da semente da galeguidade que nos deixaron.
Na frente unha estrela: Guía da exposición
Authors:   Real Academia Galega
Published: December 2021

Manuel Curros Enríquez tivo presenza esencial na fundación da Academia Galega; o proxecto, amplamente sentido como necesario durante o século XIX, madurouse nas frutíferas conversas que o poeta de Celanova mantivo con Manuel Murguía en 1904. A Real Academia Galega, en xusta reciprocidade, sempre estivo presente en todos os actos celebratorios do poeta de Celanova e da súa memoria. Nesta ocasión, para celebrar a fecunda vitalidade da palabra e da obra do poeta no centenario da súa morte. Guía da exposición conmemorativa do centenario do pasamento de Manuel Curros Enríquez, celebrada en maio, xuño e xullo de 2008 na Casa dos Poetas, en Celanova.
La pianificazione del territorio agricolo periurbano. Le sfide per un recupero co-evolutivo urbano/rurale e per un governo integrato
Authors: Fanfani David , Belletti Giovanni , Mancino Marco
Published: December 2021

La domanda di resilienza ed equita per gli insediamenti pone il tema del recupero della co-evoluzione "metabolica" e socio-economica fra dominio urbano e sistemi agro-ambientali. L'articolo, tramite una rilettura disciplinare e rilevando il valore di commons dei servizi eco-sistemici generabili dall'agricoltura, propone un quadro metodologico/operativo per una innovazione possibile nell'ambito della Pianificazione spaziale e dell'urbanistica e per una governance integrata di questi due domini.
Il noleggio "a cabina" nel codice della nautica da diporto
Authors: Benelli Gianfranco
Published: December 2021

Il "correttivo" del codice della nautica da diporto ha introdotto alcune rilevanti modifiche anche nella disciplina dell'utilizzo commerciale delle unità da diporto. Una delle più interessanti è stata l'introduzione della figura del noleggio "a cabina", con cui si consente all'armatore la possibilità di noleggiare separatamente a clienti diversi le singole cabine di cui è dotata l'imbarcazione. La nuova fattispecie mette in crisi il tradizionale modello di noleggio, contaminandolo con il contratto di trasporto e con quello di crociera turistica. Emerge sempre più distintamente la necessità di intraprendere un'opera di revisione della sistematica dei contratti di utilizzazione nel diporto da adeguare alle sempre nuove esigenze di un mercato in continua evoluzione.
Assessment of environmental and economic benefits of packaging waste system in Italy
Authors: Colelli Francesco , Croci Edoardo
Published: December 2021

The paper quantifies social costs and social benefits of packaging waste management system in Italy from 2015 to 2030. Future social costs and benefits are estimated based on the growth of waste generated and on the stringency of recycling and landfilling targets. Packaging waste generation is projected based on macroeconomic factors, consumer practices and technological eco-innovations. Social benefits are derived by the reduction of externalities' correspondent to the achievement of packaging waste management targets. We quantify two environmental ben-efits: avoided emissions and raw materials saved. We find that social costs may rise substan-tially in the future, as total system's operations costs in 2030 may increase by 48% with re-spect to 2015, due to the growth in the quantities of packaging waste generated. Meeting recy-cling and landfilling targets set by the new Circular Economy Package would imply a further 5% increase in total social costs in 2015. This latter increase is more than compensated by so-cial benefits related to the reduction in externalities due to more stringent targets.
Oil price, exchange rate and stock price in Nigeria: Fresh insights based on quantile ARDL model
Authors: Uche Emmanuel , Effiom Lionel
Published: December 2021

The pass-through of oil price to various macroeconomic aggregates, including the exchange rates and stock prices have been vigorously studied in the past albeit varying submissions. More so, these studies considered the relationship only within the conditional mean. To pro-vide fresh insights about the heterogeneous impacts, this study re-examines the dynamic pass-through of international oil prices to exchange rates and stock prices in Nigeria using the Quantile ARDL model. The quantile ARDL accounts for locational asymmetries among varia-bles. Findings indicate that the spillover effects of oil price shocks on both the exchange rate and stock prices in Nigeria are heterogeneous and differ significantly across the quantile dis-tributions of the foreign exchange and stock markets. The impact increases over time with greater impacts recorded at quantiles below the median. On this background, specific policies targeting the peculiar effects at each quantile of exchange rate and stock prices will ensure op-timal performance leading to higher returns to investors and market practitioners.
The prioritization of renewable energy technologies in Pakistan: An urgent need
Authors: Saleem Leezna , Ahmad Siddiqui Imran , Ulfat Intikhab
Published: December 2021

Pakistan is the world's sixth most populous country, currently facing the worst energy crisis. Although rich in renewable resources, Pakistan's energy system relies mainly on fossil fuels and imported energy for its energy needs. This study aims to use an analytical hierarchy pro-cess to prioritize six renewable technologies for Pakistan, with four criteria and thirteen subcriteria. The results indicate that solar power is particularly well suited for Pakistan, as it gained 42% priority weightage in the final aggregation. Wind energy is ranked second with a priority weight of 24%, followed by hydro 13%, biomass 9%, ocean 8% and geothermal en-ergy 3%. Solar and wind energies accounted for nearly 66% of the total weightage. This result highlighted the significance of economic criteria for the selection of renewable technologies in Pakistan, with around 43% priority weightage. Environmental criteria gained 19% whereas socio-political criteria registered 14% and technical criteria 23% priority weightage. During the potential assessment of the research, it was concluded that although renewable resource development has not been allocated sufficient attention in Pakistan in the past, if the correct decisions are taken regarding the exploitation of these resources, this can remedy the country's hazardous dependence on fossil fuel and imported energy.
Percorso di alfabetizzazione emotiva in un intervento didattico inclusivo con l'utilizzo delle tecnologie
Authors: Filippo Dettori G. , Letteri Barbara
Published: December 2021

Il contributo descrive un'attività didattica, realizzata in una classe seconda di una scuola secondaria di primo grado, nella quale era inserita un'alunna con disabilità e con problemi di disregolazione emotiva. La proposta illustra un percorso di alfabetizzazione emotiva realizzato dal team docente e dall'educatore, con l'utilizzo delle tecnologie innovative finalizzate a promuovere un miglioramento della consapevolezza e della manifestazione emotiva da parte di tutti gli studenti.
Gli eredi del Lago Cowichan: una storia sulla nascita della ricerca in psicoterapia della Gestalt in Canada. Estratti dell'intervista a Les Greenberg
Authors: Lotta Francesco , Tropianskaia Jay , Deutsch Salamon Sabrina
Published: December 2021

C'è poca documentazione sull'origine della psicoterapia della Gestalt in Canada e sulla nascita della ricerca in questo approccio. Questo articolo fornisce informazioni sulla fondazione dell'Istituto di Gestalt di Toronto (GIT), che ha preso origine dalla comunità gestaltica del Lago Cowichan. Si riportano estratti di una intervista al prof. Leslie Greenberg, un membro della prima classe di specializzati al GIT, considerato il padre della ricerca dagli psicoterapeuti della Gestalt. Questi brani dell'intervista fanno luce sulla nascita della ricerca gestaltica, attraverso un viaggio nelle prime esperienze di formazione di Greenberg, e nelle sue prime ricerche in ambito gestaltico, fino alla risoluzione, nel corso degli anni, del suo rapporto con la psicoterapia della Gestalt.