bluuebunny/crossref_metadata_2025 huggingface dataset:
Impact shock events in multimodal container transshipment for packaging testing
Authors: Németh Zs. , Böröcz P.
Published: May 2023

In modern global supply chains, intermodal and multimodal distribution has become essential means of transportation. The combination of different modes of transport is the most commonly used method for distributing shipments between continents. This paper examines and measures physical events, such as shock and impact, that occur while transporting 40ft long ISO containers using multiple modes of transport. These events can directly affect the integrity of packaged products and cause damage. The study focuses on events such as transshipments and handling of containers in hubs and terminals. The impact shock levels were separately analyzed in all three-dimensional directions, namely vertical, longitudinal, and lateral. The results indicate the percentage of occurrence below a given impact level using statistical characteristics of the events that occurred. The magnitude and mean of acceleration levels, pulse duration, and velocity change are also reported.
Improvement of the pneumohydraulic amplifier for press machines: Design and parameter calculation
Authors: Polishchuk M. , Tkach M. , Kornaga Y.
Published: May 2023

Pneumohydraulic pressure amplifiers are widely used in mechanical engineering. Using a pneumohydraulic amplifier makes it possible to minimize the size of the presses while simultaneously multiplying their technological effort. A significant disadvantage of the classical method of force multiplication is the low speed of movement of the working bodies of technological equipment under a hydraulic drive. The article proposes a fundamentally new design of a pneumohydraulic amplifier, in which a high-speed pneumatic cylinder carries out the idling of the technological tool, and force multiplication is carried out only at the stage of the working stroke, which allows many times to increase the performance of the amplifier. This effect is achieved by using a movable hydraulic chamber. The engineering formulas and diagrams presented in the article for calculating the parameters of a new pneumohydraulic amplifier allow engineers to adapt the amplifier to various technological conditions. The economic effect when using the proposed amplifier design is achieved by multiplying the productivity of the press equipment.
Model Predictive collision-free path following control for nonholonomic mobile robots
Authors: Hiep Thai , Cong Vo , Phuong Le
Published: May 2023

In this research, a model predictive collision-free path following controller is developed and applied for an omnidirectional mobile robot (OMR). The mobile robot is controlled to track a reference path while avoiding collision with obstacles. The path-following problem is reformulated into the regulation problem of an extended plant by introducing a virtual degree of freedom, the path parameter of a geometric reference curve. Then a Model Predictive Controller (MPC) is then applied to steer the mobile robot. The optimization cost function is established from the difference between the state of the robot and the parameter path. The solution of MPC can be obtained by repeatedly solving an optimal control problem (OCP) to reduce the optimization cost function to a minimum value, making the robot state as close to the state of the path as possible. Obstacle avoidance is considered by adding terms as a function of the gap between the mobile robot and the objects in front of the robot. Constraints on the states and inputs of the system are also easily considered in the optimal control problem of MPC. This makes the control inputs not exceed the allowable limits of the robot. Simulations are carried out to reveal the controller's efficiency and show how to choose the right parameters to synchronize path tracking and obstacle avoidance tasks.
Simulation study of RCS/R-systems with several robots serving one picking station
Authors: Trost Philipp , Karting Georg , Eder Michael
Published: May 2023

Robot-based compact storage and retrieval systems (RCS/RS) are fully automatic storage systems operated by robots from above. Therein, goods are stored in plastic bins stacked on each other, resulting in a 'Last-In-First-Out' storage strategy within each stack. This ensures very high degrees of space utilization. If containers located further down the stack are required, the robots relocate those stored above the required one. RCS/R-systems can typically be found in e-commerce, the pharmaceutical industry, and food or spare parts trade. Besides the system parameters, many other factors, such as the number of robots or the grid size, influence the system's behavior. This paper focuses on the system's throughput and the optimum number of operating robots. A discrete event simulation (DES) in the SIMIO simulation program gained insights into design variants and operating modes.
Control design using PID with state feedback for Air-breathing Hypersonic Vehicle
Authors: Singh Ritesh , Prakash Om , Joshi Sudhir
Published: May 2023

The paper uses the state feedback technique to provide a control design method for a dynamic linear 6-degree-of-freedom (DOF) model of an Airbreathing Hypersonic Vehicle (AHV). A linear model of AHV with a state space model is developed for the open loop simulation for the level flight with Mach number 5 and a height of 65000 ft (19812 m). The dynamic stability of AHV is analyzed, and state feedback with the pole placement method is implemented for the controller design. The dynamic stability, response, and comparison for the PI and PID controller are presented for the aileron deflection da and rudder deflection dr for the AHV linear model.
Nonlinear dynamic analysis of meteorological variables for Ha'il region, Saudi Arabia, for the period 1990-2022
Authors: Majid Mohammed , Nooran Mohd , Razak Fatimah
Published: May 2023

The study applies diverse methods of chaos detection to meteorological variable data (air temperature, relative humidity, surface pressure, precipitation, and wind speed for Ha'il, Saudi Arabia) to understand the nonlinear dynamics and to classify their nature. Additionally, Random Forest Algorithm model is used to predict the precipitation and wind speed. The results obtained by classical and modern approaches are compared. All the variables are found to be chaotic based on correlation dimension, approximate entropy, and 0-1 test. The chaos decision tree algorithm diagnoses air temperature, relative humidity, and wind speed as chaotic, while precipitation and surface pressure are identified as stochastic. This shows that the classical methods are well-validated with the modern methods. Nevertheless, some of them contradict modern methods. The analysis for 32 years of data showed no precipitation for 92% of the time during the entire period based on the Random Forest algorithm.
Design of Fractional-Order PID controller for trajectory tracking control of continuum robots
Authors: Belkhiri Ayman , Amouri Ammar , Cherfia Abdelhakim
Published: May 2023

Continuum robots are the behavioral extension of hyper-redundant robots usually inspired by living biological organs. These robots outperform their rigid counterparts regarding high flexibility, dexterity, and most importantly safe interaction. On the flip side, they are kinematically redundant, highly nonlinear, and multi-input, and consequently, their controlling remains a complex and challenging task. To this end, this paper proposes a Fractional-Order Proportional-Integral-Derivative (FOPID) controller to control the continuum robot's end-tip. The proposed controller is designed to control the inputs of a class of continuum robots, namely the Cable-Driven Continuum Robot (CDCR). To design the controller satisfactorily, the Particle Swarm Optimization (PSO) algorithm extracts the optimal values of the controller's parameters. The proposed FOPID controller's efficiency and control performance are demonstrated through two simulation examples: set-point tracking and point-to-point trajectory tracking. In addition, the obtained simulation results are compared to those provided by classical and Optimized PID controllers and to some available schemes. Given the obtained results, it is clear that the performances of the proposed FOPID controller are superior in tracking accuracy and smoothness in control signals.
An analysis of causal relationships among challenges impeding adoption of Industry 4.0 through DEMATEL technique
Authors: Bisht Vaibhav , Sridhar V.G. , Janardhanan Mukund
Published: May 2023

Industries must be more innovative than ever before to face rising global competition and stay in the market today. These now aim to enhance operational efficiency by using different advanced technology tools and techniques of Industry 4.0, satisfying the varying customer needs with products of the highest quality offered at minimal costs. With different bottlenecks faced in industrial operations, the large-scale adoption of such systems faces multiple impediments relevant to the country's socioeconomic make-up, and therefore, nine pertinent barriers deterring India's transition to Industry 4.0 with varying interdependencies and importance are identified. Data collected from multiple industry experts is subsequently analyzed using the DEMATEL (Decision Making Trial and Evaluation Laboratory) technique to identify the key barriers having the biggest influence over India's industrial landscape based on their cause effect value and importance scores. The study conclusively ends with discussing the analysis findings for use in solving complex industry problems and identifying new roles, work environments, and skills required in different domains for the adoption of systems of Industry 4.0 in India.
The breakup of the former socialist Republic of Bosnia and Herzegovina: The Drina battlefield
Authors: Lunić Tomislav
Published: May 2023

We provide the analysis of the war in the former Socialist Republic of Bosnia and Herzegovina by analyzing the Yugoslav crisis, namely, the disintegration of the Socialist Federal Republic of Yugoslavia (SFRY). Bosnia and Herzegovina was located in the heart of the former SFRY. It was a bridge between Croatia and Slovenia in the West and northwest, with Serbia and Macedonia in the East and southeast, and with Montenegro in the south. After Slovenia and Croatia declared their independence, Bosnia and Herzegovina stopped being that "synapse", the solid foundation of unity and coexistence of Serbs, Croats, and Muslims. In 1992, the civil "spilled over" into the Socialist Republic of Bosnia and Herzegovina. The Dayton Agreement ended the war in 1995. To begin with, we describe the events that led to the breakup of the former SFRY. The introduction of the multi-party system and democratic elections in 1990 did not ease the growing tensions. The three constituent nations of Bosnia and Herzegovina could not agree on the constitutional framework of the country they were creating. The Muslims insisted on unitary Bosnia; the Croats supported the union of the three entities, while the Serbs wanted to preserve the Socialist Republic of Bosnia and Herzegovina as a part of the Socialist Federal Republic of Yugoslavia. The plan was to potentially make the country a federation or a confederation. The War was inevitable. In the second part of the paper, we focus on the creation of the Republic Srpska and the Army of the Republic Srpska, with the emphasis on the war events that took place in the Drina area. The Drina River, as a natural border between Serbia and Bosnia and Herzegovina, represents the "lifeblood" of the survival, existence and well-being of the Serbian people in Bosnia and Herzegovina. Hence, the conflicting side tried to occupy that area to sever the ties of the Republic Srpska with the mother country, Serbia. Finally, based on the relevant data and research findings, we give our opinion on the outcome of the war, as well as the consequences for the current and generations to come.
Anka and Milan: Letters of Dr Milan Dimitrijević in the Archives of the Serbian Academy of Sciences and Arts
Authors: Spasović Ivana
Published: May 2023

The paper presents the letters of Dr Milan Dimitrijević and his family, kept in the Archives of the Serbian Academy of Sciences and Arts, in the legacy of Patriarch German Anđelić (1822-1888). Milan Dimitrijević (1844-1901) was a teacher in the Grammar School in Sremski Karlovci and a reliable associate of Patriarch German. This correspondence reveals the biographies of Dimitrijević and his wife, and also offers a new insight into the political scene in Hungary of the 1880s and 1890s.
The Communist Manifesto and the fatherland: On the development of the national question in young Marx
Authors: Matković Aleksandar
Published: May 2023

The 175th anniversary of the publication of the Communist Manifesto passed unnoticed recently. In order to contribute to the anniversary in the spirit of a scholarly discussion, this article begins a forgotten topic - Marx's consideration of nationalism and national struggles. Through the analysis of the Manifesto and Marx's and Engels' political articles, the author presents new elements of Marx's theory of the nation, which rested on the difference between progressive and regressive struggles: those that led to greater democratization of society through the inclusion of the proletariat and those that opposed it. The criticism of young Marx is presented at the end, along with the contribution he can make today.
The ukrainian war and Russophobia of the "other Serbia"
Authors: Antonić Slobodan
Published: May 2023

In the first part of the article, the theoretical framework of the analysis is given and the basic terms are explained. The second part presents examples of Russophobia in the texts of some members of the media and cultural elite in Serbia even before the outbreak of the war in Ukraine. The third part describes the escalation of Russophobia among that part of the elite after the Russian intervention in Ukraine (2022). The fourth part provides an overview of seven surveys of public opinion in Serbia (2022-2023). All these surveys show a high proportion of Serbian citizens (about 80%) who do not agree with the introduction of sanctions against Russia. An overview of attempts to ignore these findings by a part of the Russophobic elite in Serbia is also given. In the fifth part, the further escalation of Russophobia among the elite is described, and in the sixth part, an explanation of this phenomenon is presented from the perspective of the world system theory
Istraživanje depresije kod starih osoba u institucionalnim i vaninstitucionalnim uslovima na teritoriji Beograda
Authors: Milosavljević Gordana , Vidanović Vojin
Published: May 2023

Introduction: Depressive disorders (depression) represent one of the most common mental disorders today, which is manifested by moodiness, loss of interest and pleasure, feelings of guilt and inferiority, sleep and appetite disorders, loss of energy and poor concentration. Depression is one of the most common disorders encountered by doctors in the practice of primary health care and represents a serious medical and social problem. In elderly age, it most often occurs with other health conditions and diseases and lasts longer than in younger people. Given that 10-15% of the elderly suffer from depression, depression is recognized as the most common mental health disorder of the elderly. It is very import-ant to recognize the symptoms of depression because they can often be unrecognizable due to somatic symptoms. The aim of the work is to examine depression in old people in the area of the city of Belgrade. Method: An anonymous questionnaire was used as a research instrument. The time of the conducted research is July-August 2022. The total number of respondents is 80 old people, and they answered 24 questions. Results: Persons over 85 years old (83.3%) have depressive symptoms. Depressive symptoms are more frequent in women than in men (M:F 88.8%:48.5%). Subjects with a vocational qualification most often have depressive symptoms (75%). Respondents who are single (73.7%), divorced (60%) in institutions (75%), live on the floor (55.6%) alone (62.5%) and receive social assistance (73.5%)) more often have depressive symptoms compared to respondents who are married (79.5%), live in a house/apartment (71.7%) with their spouse (77.5%) and receive a pension (80.9%). We can conclude that the largest number of depressed people is over 85 years old, where every third female person has depression in our sample. Conclusion: The study showed that most often, depressive symptoms appear in subjects with incomplete elementary school, single/unmarried, in institutions, living alone and receiving social assistance.
Stavovi zdravstvenih profesionalaca prema radu u inostranstvu
Authors: Vuković Vesna , Maksimović Vesna , Trbović Verica , Dimoski Zvonko , Krsmanović Slavica , Jovanović Vesna
Published: May 2023

Insight: The subject of this paper is a better understanding of the most important aspects of the emigration of professional nurses, professional nurse-midwives, health workers for work. In the first decade of this century, "brain drain" became one of the key elements of world globalization. The aim of the work: The aim of this research was to investigate the attitudes towards working abroad of the students of the State School for Applied Health Studies by profiles. Method of work: The research was carried out on a sample of 85% of nurses-technicians, 633 students of the College of Health Professional Studies in Belgrade, as a cross-sectional study examining the attitudes of professional nurses, professional nurses-midwives, and health workers towards working abroad. Results: Based on the results of the work, it was established that the most common reasons for students to go to work abroad are: lack of jobs for the appropriate nursing profession in the country, more opportunities for better professional placement, and achieving a higher quality of life. Conclusion: Looking at the attitudes towards working abroad of the students of the State Medical College, it can be concluded that 70% want to work abroad, mostly after graduation and permanently, and 14% of the respondents have a ready plan to leave for employment abroad.
Influence of physical activity on maintaining the balance of autonomic nervous system
Authors: Marinović D. , Pecarski D. , Dimitrijev I. , Mitrašinović D.
Published: May 2023

The autonomic nervous system (ANS) is responsible for control of many functions that are independent of our control. It is a basic component of our emotional reactions that controls our ˝flight or fight ˝mode at stressful moments. When the ANS is overloaded, it can cause symptoms including insomnia, anxiety, cardiovascular and digestive disoders. The importance the need for better under-standing of the ANS justifies our efforts to discover mechanisms to improve it's function. During the COVID -19 pandemic there was emphasis on better understanding of the ANS functions that can influence the degree of complications of corona virus disease for individual patients. Our modern way of living can avoid the basic biological need for movement reducing the positive effects of physical activity on the ANS and maintaing homeostasis. Physical activity provided protect from infectious disease such as COVID 19 or chronic non ineffective disease.
Bezglutenska ishrana i sportska aktivnost
Authors: Đordjević Ivana , Đurović Olivera
Published: May 2023

"Gluten-free" is now becoming a catchphrase that has spread rapidly over the past few years and is often used in food advertising to entice individual consumers to join the diet of prominent sports figures. Certainly, a gluten-free diet for some people is a necessity in case of illness, but very often it is a product of striving for a healthier and different way of life carried out through nutrition. This way of eating is often represented by professional athletes, who have to compensate for their increased need for carbohydrates in a different way, when the regime of training and activities is completely adapted to a gluten-free diet. In this way, eliminating gluten quickly becomes a way of life after a short period of time. It is essential to note that a gluten-free diet is not necessary for a "healthy" diet -there is a much more efficient way to achieve such a style of eating, but still, you should know that some people must avoid gluten if they have celiac disease or an intolerance ie. gluten sensitivity. How and in what way a gluten-free diet affects sports activities, as well as what training method is recommended with such a diet, through a research review of the literature and previous research, the work follows the general indicators of what gluten is and how its exclusion from the diet manifests itself in sports activities.
Synthesis, structural and mechanical properties of gelatin-based nanocomposites with zinc oxide for use in dentistry
Authors: Jovanović Marija , Petrović Miloš , Zlatanović Nikola , Ali Elmadani , Radojević Vesna
Published: May 2023

In this paper, the composites with the matrix of gelatin (GA) and poly(vinylpyrrolidone) (PVP) blend with nanoparticles of zinc oxide (ZnO) were prepared. In order to improve the mechanical properties, the samples were cross-linked with glutaraldehyde (GTA). The processing was carried out by the solution casting method, and the influence of cross-linking and nanoparticles on the mechanical properties of the obtained composites was investigated. FTIR analysis confirmed the cross-linking of the polymer matrix and that no chemical bond was formed during processing between the polymer matrix and zinc oxide nanoparticles. Examination of the mechanical properties showed that the cross-linking and addition of 1 wt% zinc oxide increased tensile strength, modulus of elasticity, hardness and reduced modulus of elasticity.
Methodology of crane rail geometry control by geodetic measurements
Authors: Vranić Petko , Popović Jovan , Pejović Milutin , Milovanović Branko , Martinenko Anastasija
Published: May 2023

In the new hall of the Institute for Materials and Structures, there was a need to control the geometry of the existing crane rails. In this paper, the methodology for determining the geometry of such a complex structure is presented, and the results of the applied method are also presented. The final product, i.e. the examined geometry of crane rails included numerical and graphical analysis of straightness, analysis of parallelism and analysis of horizontality of crane rails.
Programming and program verification for robots that perform machining tasks
Authors: Živanović Saša , Slavković Nikola , Tabaković Slobodan , Dimić Zoran
Published: May 2023

The paper presents the programming and program verification of industrial robots that perform machining tasks. The paper considers the different methods for robot programming and the possibilities for configuring virtual robots for machining simulation and program verification for such tasks.
On stochastic processes in the dynamics of planetary transmissions
Authors: Knežević Rade , Đedović Branko , Paić Marko
Published: May 2023

In addition to the theoretical analysis of the nonlinear dynamics of dissipative mechanical systems with the possibility of stochastic and chaotic processes, the paper also includes a numerical experimental example of a planetary transmission. The most common non-linear effects of operation and their influence on the behavior of the planetary gear as a system were analyzed. A simplified model of planetary gears as dissipative dynamic systems whose operation is a complex dynamic process with different effects was considered. These operating effects can appear in many different ways and can be the cause of stochasticity in the operation of the planetary gear. A numerical analysis of planetary gear lubrication was made, as one of the effects of stochasticity, where turbulent damping occurs. The turbulent damping force, due to oil splashing, is taken to be proportional to the second power of the angular velocity of the sun gear. Based on the experiment, it is concluded that the phase space in this system is not preserved and the system is dissipative because the trajectories spiral down into a certain singularity.
Influence of management styles on the commitment of local government employees
Authors: Đurović Mihajlo , Petrović Dejan , Perić Goran
Published: May 2023

Local government as a part of the independent management of local communities represents the basic organization of government. Management is a process of guiding employees toward activities that are relevant to achieving local government goals. Many authors analyzed this subject in their work, while this subject, as well as management styles and the influence of management styles on the commitment of employees in local government, remains unexplored, especially in the context of the Republic of Serbia. The main goal of this research is to look into the influence of management styles on local government employee dedication. This research was conducted during July and August of 2022 and includes a sample of 70 examined local government employees in Serbia. The influence of management styles (transactional, transformational, and passive) on employees was tested with the use of linear regression. The results of this research conclude that transactional leadership has a medium level of influence on local government employee dedication, while the level of transformational management influence on local government employee dedication is high. In the conclusion of this research results are discussed and limitations are set as well as the practical implications of this work.
Strategic management and business model
Authors: Lisse Stanislav
Published: May 2023

With the help of numerous quotes from books and textbooks by contemporary authors of indispensable works on strategy and strategic management, I tried to provide the reader with a series of definitions of key terms and point out the importance of the correct sequence of activities in the strategy development phase. Strategic management, although young, is a very large scholarly field (most textbooks focus mainly on strategy development, the first of the three phases of strategic management, and most are more than 900 pages long). The second and third phases, the implementation and evaluation of the strategy, are mostly omitted with the explanation that they depend on the economic branch in which the organization operates. Here is article four, excerpted from my unpublished monograph on business strategy. In the previous three articles, I tried to present, through quotes from renowned authors, the modern understanding of strategy and its role in the organization's efforts to achieve a favorable position on the market and successfully resist the attacks of agile competitors. Many academics believe that a business model is a picture (a picture is worth a thousand words) of a realized strategy and that it is the finale of strategic management, which consists of a series of activities that natural evolution has kept as crucial in the fight for the survival of not only living beings but also of every organization.
Characterization of zirconium oxidecoating stabilized with cerium and yttrium oxide deposited on the bonding coating nickel chromium aluminum cobalt yttrium oxide
Authors: Mrdak Mihailo , Lačnjevac Časlav , Bajić Darko
Published: May 2023

Zirconium dioxide ZrO2 is used as a basic material for thermal barriers and as a biomaterial for manufacturing parts for hip implants in orthopedic surgery and in dentistry for making crowns. Use of ZrO2 ceramics as an insulating material and biomaterial is due to its good chemical and dimensional stability, mechanical strength, toughness and elastic modulus. The aim of this study was to analyze the characteristics of zirconium oxide coating of stabilized cerium and yttrium oxide deposited by atmospheric plasma spraying (APS) process on the bond coating of nickel chromium cobalt yttrium oxide. Coatings were deposited on cold substrates and on substrates preheated to 180°C. Composite powder nickel chromium/aluminum/cobalt/yttrium oxide was used for the production of bond layers and for the ceramic layers zirconium oxide stabilized with cerium and yttrium oxide powder. Testing the quality of coatings was done by measuring microhardness of layers using the HV method and for bond tensile strength of the coating system tensile testing was applied. Metallographic evaluation of the share of pores in the bond and ceramic layers was performed with image analysis - processing of images from a light microscope. Powder particle morphology and EDS analysis were performed on the SEM. The obtained results confirm that the preheating temperature of the substrate has a significant impact on structural mechanical properties of the tested coatings system.
Synthesis of nanoparticles in dual biodiesel and enchancement in performances and emission characteristics
Authors: Antony Casmir , Ghana Dhas , Kumar Alagarsamy
Published: May 2023

Biodiesel is being advertised as a realistic alternative fuel. Since it has a lower environmental effect than standard fuel properties, biodiesel has risen in popularity recently, and there has been a lot of study done on it all around the world. Biodiesel is prone to oxidation due to the presence of unsaturated fatty acids in the ester, which has been one of the biggest downsides. When biodiesel comes into contact with oxygen during storage or even with metal impurities, it oxidises. Antioxidants are really helpful in resolving problems with oxidation stability. In this paper, mainly discussed about dual biodiesel (40:60), mixed with TiO2 Nanoparticles at various 25 ppm levels for the blend DBNP20, DBNP40 and DBNP60 respectively. The results implies good performances and emission characteristics with lower SFC and reasonable values are tabulated in the with neat diesel values.
The inhibitive effect of magnetic fields on mild steel corrosion in acidic media
Authors: Tamadu Obi , Maurice Mejeha , Bierechi Okeoma
Published: May 2023

The inhibitive effect of applied magnetic fields on the corrosion of mild steel in 1.0M HCl and 0.5M H2SO4 acid solutions has been investigated at room temperature by using the gravimetric technique. A locally made electromagnet with variable outputs and powered by a direct current source voltage provided the magnetic fields. In a typical experiment, the applied magnetic field was applied perpendicularly onto the surface of a mild steel coupon immersed completely in a chosen acid solution for an exposure time of two hours. It was observed that the corrosion rates of mild steel determined for each case of 1.0M HCl and 0.5M H2SO4 test solutions decrease as the applied magnetic field increases. This indicates that the presence of the applied magnetic field inhibits the corrosion of the mild steel in the test solutions. Results also show that the protection efficiency of the magnetic field increases as the applied magnetic field increases. More specifically, as the magnetic field was increased from 118.2 - 764.3mG [or 0.01182 - 0.07643 mT], the protection efficiency increased from 36.34 - 62.67% for mild steel in 1.0M HCl acid solution, while for mild steel in 0.5M H2SO4 acid solution, the protection efficiency increased from 12.68 - 46.88%. It was demonstrated that the observed inhibitive effect of the magnetic fields can be attributed partly to the phenomenon of transverse magnetoresistance and partly to the effect of the magnetic fields on the mass transport properties of the constituent ions in the electrochemical system
Removal of bemacid red dye by adsorption on sawdust and carbonized sawdust
Authors: Drljača Dijana , Dragić Dajana , Borković Aleksandra , Botić Tatjana , Jandrić Radmila
Published: May 2023

Today, huge amounts of coloured wastewater, released into ecosystems are a big problem, because they have harmful effects on humans, the environment, as well as the aquatic environment. One of the common treatments for removing dyes from wastewater is the adsorption process, with an emphasis on the use of cheap adsorbents. Therefore, the subject of this paper is the possibility of removing the anionic dye bemacid red (BR) on wood biomass sawdust and carbonized sawdust. The experiments examined the equilibrium contact time, the effect of initial pH, the effect of adsorbent dose, as well as the effect of the initial adsorbate concentration on the process of adsorption. By applying linear kinetic models, it was found that the adsorption process follows a pseudo-second-order kinetic model. It was found that pH does not have a significant effect on adsorption onto carbonized sawdust. By examining the effect of the initial adsorbent dose, it was found that optimal adsorption requires twice the mass of sawdust compared to carbonized sawdust. The use of linear adsorption isotherms shows better agreement with the Freundlich model for both adsorbents. The maximum adsorption capacity for sawdust is 30.18 mg/kg, while for carbonized sawdust it is 74.60 mg/kg. Use of sawdust and carbonized sawdust can be an effective adsorbent for removing the dye bemacid red from wastewater, which is confirmed by the experiment on a real sample of wastewater. The obtained efficiency of dye removal from real wastewater for sawdust is 42.9 %, and for carbonized sawdust 95.1 %.
Inhibition of corrosion of L 80 alloy in sodium hydroxide solution (pH=12) by succinic acid
Authors: Kumar Rini , Kumar Raja , Ramalingam Swathi , Swetha Selvara , Mariya Selastina , Punitha Pricilla , Ramesh Simirna , Sathya Priya , Hema Dharshini , Yuva Sri , Nilavan Anitha , Rajendran Susai
Published: May 2023

Inhibition of corrosion of L80 alloy in sodium hydroxide solution (pH=12) by succinic acid has been evaluated by electrochemical studies such as polarization and AC impedance spectra. The study reveals that succinic acid is able to control corrosion of L80 alloy in NaOH solution (pH = 12). When L 80 alloy is immersed in NaOH solution , the linear polarisation resistance (LPR) increases and the corrosion current (Icorr) decreases as revealed by potentiodynamic polarization study. Succinic acid at pH=12 functions as anodic type of inhibitor. When L80 alloy is immersed in NaOH solution , the charge transfer resistance (Rt) increases, impedance increases, phase angle increases and double layer capacitance (Cdl) value decreases . These results suggest that a protective film is formed on the metal surface and probably the protective film consists of Fe 2+ - inhibitor complex (Iron succinate).
Investigation of stress-corrosion cracking of welded joint of H70 steel under cathodic polarization in near neutral environment
Authors: Nyrkova Lyudmila , Lisovyi Pavlo , Gonchasrenko Larysa , Osadchuk Svetlana , Kharchenko Yulia , Klymenko Anatoly , Kostin Valery
Published: May 2023

Study of stress-corrosion cracking of welded joints made of X70 steel at cathodic polarization in near neutral solution NS4 was carried out. It was established that the tendency of base metal of X70 steel to stress-corrosion cracking, estimated by KS coefficient, increases from 1.07 to 1.13 whereas polarization potential changing from the corrosion potential to maximum protective potential -1.05 V. Such regularity correlates with increasing of hydrogen penetration through X70 steel, which at maximum protective potential -1.05 V is equal to 0.000518 mol/m3 . Susceptibility of welded joint is lower than the base metal, KS coefficient change not much near the value 1.0. With increasing of polarization potential from -0,75V to -1.05V fracture surface of X70 steel characterized by decreasing in the size of holes and the appearance of flat areas, through that the rupture occurred. A similar nature of the rupture was observed for the welded joint, but visually larger proportion of flat areas can be noted. It was established that the rupture of the welded joint occurs on the base metal, which allows to propose stress-corrosion cracking susceptibility factor KS to be legitimately used for estimation to stress-corrosion cracking of welded joint, provided the weld is performed in a high-quality manner. Stress-corrosion cracking results of welded joint of X70 steel correlate satisfactorily with the experience of stress-corrosion cracking on main gas pipelines, where stress-corrosion cracks form and develop along the base metal of gas pipelines.
The Risk of Developing Central Line-Associated Bloodstream Infections in Integrated Health Care System of Pakistan-A Meta-Analysis
Authors: Nasir Alia , Khawaja Fahmeda , N Khan Gloria
Published: May 2023

Studies regarding the prevalence of CLABSIs in Pakistan are limited. However, it is known that healthcare-associated infections are a concern in many low- and middle-income countries, including Pakistan. The present study is aimed to identify the relative risk of developing CLABSIs in the hospital care setups of Pakistan. The risk of biases in included studies was assessed using Cochrane tool parameters. Analysis of results revealed a relative risk of getting CLABSIs is 1.78 (p<0.001) among patients admitted in the hospitals for greater than 72 hours. This shows that the chances of getting infected at the central line site were more than 50% among patients admitted to ICUs in Pakistan. It has been concluded that the relative risk of CLABSIs in the integrated healthcare system of Pakistan is high.
The Knowledge, Attitude, and Practice about Fertility Preservation among Oncologist-A Cross-Sectional Study
Authors: Hassan Batool , Asim Nosheen , Azhar Farzana , Saleem Zulekha
Published: May 2023

Background

Fertility Preservation is the process of saving or protecting a person’s ability to have children in the future. It is often considered for individuals who are about to undergo medical treatments that may impact their fertility, such as chemotherapy. Hence, the current study is aimed to assess clinical practitioners’ knowledge, practice, and attitude toward fertility preservation among oncologists.

Methods

A cross-sectional survey was carried out to identify the current knowledge, attitudes, and practices regarding fertility preservation among oncologists—a total of seventy-nine oncologists in Karachi working in different public and private sectors. The study was conducted between January to August 2022. The data was gathered using a self-designed questionnaire that was distributed via email.

Result

One hundred and eighty oncologists were provided with the survey form via email. The response rate was 47.22% (n=85). Out of which, six questionnaires were excluded due to incomplete information. The total questionnaire analyzed was n=79, which included 58 (73.41%) males and 21 (16.59%) females.

Conclusion

The results revealed that oncologists had a compromised knowledge regarding fertility preservation for cancer patients. Despite weak knowledge, most oncologists believe that more elaborative measures should be taken to overcome this issue.

Keywords

Attitude, Fertility Preservation, Knowledge, Oncologist
Unleashing the Potential in Virtual World: Opportunities and Challenges for Non-profit and Education
Authors: Vrba Jan
Published: May 2023

The rise of virtual organizations has brought a significant transformation in the way businesses and non-profit organizations operate. This paper provides an overview of a virtual organizations management, effective virtual team management strategies, and the impact of virtualization on non-profit organizations. The study finds that virtual organizations offer several benefits, including flexibility, adaptability, and costeffectiveness, along with easy access to a pool of freelancers who can perform various types of work. However, effective communication, coordination, and a culture of trust, accountability, and collaboration are essential for their success. The research also examines online interventions in non-profit organizations, specifically the virtual day center, which provides a safe and relaxed space for young people to meet and talk. The study suggests that online interventions can be implemented in harm reduction programs and can increase substance abuse prevention efforts.
Transformações do estado: aproximações entre o Brasil e os PALOP
Authors: Cassinela Osvaldo Israel Salumbongo , Ckagnazaroff Ivan Beck
Published: May 2023

No presente ensaio propomos uma aproximação da produção teórica sobre as transformações que se deram na gestão pública entre os Países Africanos de Língua Oficial Portuguesa (PALOP) e o Brasil, centrado nas suas raízes histórico-culturais, discutindo estruturas explicativas, alternativas e propondo caminhos para pesquisas futuras. Para atingir os objetivos preconizados efetuou-se uma revisão bibliográfica, buscando convergências e divergências das transformações na gestão pública entre os países em tela. Partimos do pressuposto de que embora estes países tenham certas peculiaridades na gestão pública, em suas formações socioeconômicas e construção administrativa, todos eles têm raízes histórico-culturais herdadas de Portugal, têm o português como língua oficial e comungam dos mesmos pretextos para tornar sua gestão pública eficiente e menos burocrática. Entretanto, apresenta-se como limitações, a inexistência de evidências empíricas dada a amplitude do fenômeno investigado (cinco países), convergindo para uma agenda de pesquisas comparativas mais ampla, são propostas. Este estudo preenche uma lacuna na literatura ao fornecer uma análise sistemática e comparativa de modelos de gestão em países africanos pouco investigados na tradição administrativa. Concluímos, portanto, que, apesar das inúmeras transformações experimentadas, o modo de gestão pública pouco se alterou. Estudiosos defendem que no Brasil isso se deve a incorporação de reformas importadas a realidade totalmente distinta, já nos PALOP, se deve aos conflitos armados que a maioria destes enfrentaram, bem como a imposição de reformas pelos organismos internacionais, sem moldarem suas estruturas básicas de funcionamento.
Aplicação de redes neurais artificias na análise financeira das empresas do setor de petróleo
Authors: Carneiro Júnior João Bosco Arbués , Silva Mariana Carolina Ribeiro dos Santos , Nagayama Regina Rodrigues , Vona Thamiris da Silva Porto
Published: May 2023

Com o crescimento da tecnologia da informação e inteligência artificial, uma série de novas tecnologias surgiram para facilitar a gestão empresarial dos setores econômicos, como é o caso da indústria petrolífera, que possui uma grande influência no crescimento econômico brasileiro. A matéria-prima possui um alto custo de extração e também é classificado como um insumo rara para ser encontrada na natureza. As redes neurais são importantes para aumentar a quantidade de petróleo extraída com maior segurança, não apenas para os colaboradores envolvidos no processo, mas também para o meio ambiente. Isso acontece porque a tecnologia, apesar de funcionar de maneira simples, quando acompanhada de uma análise estatística, é capaz de processar diversos dados, fomentando informações importantes para melhoras a exploração de petróleo. Ademais, diversos problemas ambientais são corroborados pela emissão do petróleo na atmosfera, inclusive, contribuindo para fenômenos como a acidificação dos oceanos e aquecimento global. Nesse contexto, essa pesquisa aborda sobre a aplicação das redes neurais artificiais na análise financeira das empresas do setor de petróleo no ano de 2018. O método de pesquisa utilizado foi descritivo e quantitativo para proporcionar validação científica a essa pesquisa. Apresenta-se as conclusões com os principais resultados obtidos nesse artigo, assim como algumas limitações do método aplicado e perspectivas de pesquisas futuras.
Geração de valor público em uma organização de inclusão socioprofissional
Authors: Nascimento Maiza Flores do , Medeiros Haroldo de Sá , Morais Fábio Rogério de
Published: May 2023

O objetivo geral do artigo foi avaliar a geração de Valor Público de uma organização do terceiro setor que atua na inclusão socioprofissional de jovens ao mercado de trabalho, utilizando o Public Value Scorecard (PVSC). Foram adotados procedimentos metodológicos qualitativos na coleta de dados e análise por meio de um estudo de caso em uma organização não governamental. O PVSC permitiu mensurar os indicadores de legitimidade, capacidade operacional e valor, proposta pelo Triângulo Estratégico. Conclui-se que a organização não governamental contribui de maneira significativa na geração de valor público ao prestar serviços úteis e indispensáveis à sociedade, através do desenvolvimento de suas atividades, desempenhando seu papel com foco nos objetivos almejados, visando a entrega de serviços que atendam os envolvidos nesta relação. Para a satisfação de resultados sólidos e uma constante geração de valor, que pode ser obtido por meio do aprendizado contínuo, desenvolvimento humano e tecnológico. Propõe-se para futuras pesquisas, a utilização dos indicadores desta, para a criação de novos planos de ação, visando um desempenho de valor público mais aprimorado e sintonizado tanto para com a sociedade já assistida como para outras necessidades existentes, ampliando assim seu leque de geração de valor público.
Indeferimentos de pedidos de registro de marcas no estado do Pará, segundo a lei da propriedade industrial
Authors: Portela Júnior Wilson Sampaio , Ribeiro Suezilde da Conceição Amaral
Published: May 2023

Nos últimos anos, um número considerado de pedidos de registro de marca protocolados por titulares paraenses vem sendo indeferidos pelo INPI, somente a título de exemplificação, em 2018 houve 1.126 pedidos protocolados, no mesmo período, houve 702 indeferimentos, o que representa cerca de 62%, um índice muito alto e que pode resultar em prejuízos não só para os interessados na obtenção do registro, mais também ao próprio publico consumidor. Nesse sentido, realizou-se um levantamento, especificamente junto aos processos protocolados por titulares sediados no Pará, nos último 5 anos (2016 a 2020) e que, foram indeferidos pela autarquia federal, com o objetivo de identificar os principais motivos que geraram esses indeferimentos e, por conseguinte, após as devidas análises pertinentes ao caso, propor ações que possam ajudar a modificar esse cenário. Ao mesmo tempo, também se verificou quais desses pedidos foram requeridos pelo próprio titular e os foram realizados através de procuradores. Ao final, constatou-se que falha nos procedimentos quanto a pesquisa de anterioridade (inciso XIX, artigo 124) e a falta de conhecimento da legislação (Incisos VI E VII, Artigo 124), foram os principais motivos responsáveis pela grande maioria dos indeferimentos dos pedidos de registro requeridos por titulares paraenses e que, a grande maioria desses processos indeferidos, foram realizados por procuradores os quais, em teoria, deveriam possuir amplo conhecimento sobre a legislação que trata sobre o tema.