Material Sphere Research Articles

Preparation and Compression Resistance of Lightweight Concrete Filled with Lightweight Calcium Carbonate Reinforced Expanded Polystyrene Foam.

Lightweight concrete is widely used in the construction industry due to its low density and high strength. In this paper, lightweight concrete was prepared by a simple two-step method. Firstly, the light calcium carbonate reinforced epoxy macrospheres (LCR-EMS) material was obtained by adhering calcium lighter carbonate powder to the expanded polystyrene foam spheres (EPS) material using the "balling method". In the second step, the LCR-EMS was mixed with water, cement, and the hollow glass microspheres (HGMS) material using the "molding method" to obtain lightweight concrete. The combination of macroscopic photographs and microscopic morphology shows that the LCR-EMS material itself is uniformly encapsulated and well bonded to the matrix. Test results show that the density of the lightweight concrete decreases with an increase in the volume fraction of stacked LCR-EMS, the diameter, and the proportion of HGMS in the matrix, but it decreases with a decrease in the number of layers of LCR-EMS. The compressive strength of lightweight concrete exhibits a completely opposite trend. When three layers of LCR-EMS were used as filler material, the density and compressive strength of the concrete were 1.246 g/cm3 and 8.19 MPa, respectively. The density and maximum compressive strength of lightweight concrete were 1.146 g/cm3 and 6.37 Mpa, respectively, when filled with 8-9 mm-2L-90 svol% of LCR-EMS and 40 wt% of HGMS in the matrix. Compared with lightweight concrete filled with 90% EPS, the density increased by 20% while the compressive strength increased by 300%.

STUDYING THE CHANGING COMPETENCIES OF GREATER PARIS (TO THE 100TH ANNIVERSARY OF A.E. SLUKA)

The article deals with the study of Greater Paris in the context of changing paradigm of the development of a large city under the transnationalization of world economy and the process of globalization. The contribution of A.E. Sluka, Professor of the Moscow University, Honorary Member of the Russian Geographical Society, who created a “dynamic” portrait of the French capital of the second half of the twentieth - early twenty-first centuries on the basis of the synthetic approaches and revealed the main features of its socio-economic geography, is evaluated. The article analyzes shifts in the functional structure of the metropolis during the transition to the “international city” model as a result of the implementation of the decentralization and dein-dustrialization policy. The scientist’s ideas on studying the competencies of the city as a corporate center and in the context of practices of the largest agglomerations of the world are being developed. GIS technologies are applied to describe the specific features of Greater Paris as a location of the country’s largest TNCs and the acceptor of branches of foreign companies. The multidisciplinary nature of large national business is revealed, which contributes to the development of interfirm cooperation and serves as an additional resource for the competitiveness of the city. The sectoral structure of foreign corporate segment of its economy is dominated by companies in the material sphere of production (mechanical engineering, chemical and food industries), while the geographical structure is dominated by the US TNCs. There is a consolidated placement of local and foreign companies mainly in three functionally different clusters (within the historical core, the Defense district and Paris-Saclay). Based on the materials of international statistics and ratings of cities, the modern place of Greater Paris among the “world capitals” is considered applying the comparative geographical method. Most ratings include it in the top-5 cities of the planet and characterize it as a multifunctional center of global importance, permanently expanding the scope of its competencies. Being inferior in absolute value of the main economic resources, innovative and environmental indicators, it is ahead of many largest agglomerations of the world in terms of the scope of economic and political influence, information exchange and cultural interaction, as well as the quality of life; it is well-known by specific creative industries. When analyzing the image of the French capital on the basis of sociological surveys, the stability of its “global attractiveness” is noted due to the resources of symbolic capital, which plays an increasingly important role in the information society.

The integration of the universal values of sport into physical education: Positive Youth Development (PYD) framework

The value given to sports to be taken and applied, especially in the physical education process, to support the development of students' adolescent character, this study aims to integrate the universal values of sports into the seven spheres of physical education learning materials to encourage positive adolescent development. The research method used is quantitative, with a quasi-experimental design. The sampling technique uses purposive sampling techniques, with certain considerations from researchers, including students who do not participate in extracurricular sports, with 60 students. The instrument used was a questionnaire of 73 items designed to measure a universal scale of sports scores with validity tests obtained less stable scores = 0.254. Data analysis techniques describe statistical data, normality tests using Shapiro Wilk, homogeneity tests using Leene tests, and hypothesis testing using paired sample t-tests. The result of this study is that the universal values of sport can be well integrated into every physical education lesson in schools. Students can develop social and emotional skills fundamental to success by utilizing these principles in life inside and outside school. Incorporating these values can also help young people cope with the demands of competitiveness and focus on personal growth, not just winning or losing.

Upgrade and Modification of a Machine for Micro-Abrasion Wear Testing in Simulated Biological Environments with Oscillatory Motion

Aiming to evaluate the useful life of biomaterials used in joint prostheses, this study performed different wear tests in stainless steel 316L, a biomaterial used in hip joint replacements. The tests were carried out in a dry medium, with the help of an equipment that was improved regarding some of its characteristics and allows conducting wear tests via the contact of two bodies, one of them being the biomaterial under study and the other one a sphere of a harder material. For the evaluation, a device was developed to change the rotation of the sphere, varying the angle it traveled and the frequency with which it did it. Once the improvements were made to the aforementioned equipment, tests were conducted which involved obtaining wear tracks in order to observe the surface morphology through scanning electron microscopy (SEM) and to measure the length and the width of the tracks, with which the biomaterial wear coefficient was obtained for each case studied. In these tests, the wear coefficient showed variations with respect to the sphere’s angle of travel.

Collision efficiency of like-charged spheres settling in a quiescent environment

We study the gravity-induced collisions of charged spheres of dielectric materials dispersed in a gaseous medium. When the gap thickness between the surfaces of two spheres is shorter than the mean free path of the surrounding fluid medium, continuum assumptions for the hydrodynamics interactions are no longer valid, and the non-continuum lubrication interactions result in surface-to-surface contact in finite time. Two like-charged dielectric spheres attract each other at close separations for a wide range of size and charge ratio values. We use trajectory analysis to calculate the collision rate and, thus, explore the role of electrostatic interactions in the collision dynamics of a pair of like-charged dielectric spheres. We present the modifications of pair trajectories due to electrostatic forces and show how collision efficiencies vary with the non-dimensional parameter capturing the relative strength of the electrostatic force to gravity as well as the charge ratio and size ratio.

Granular Segregation in Gravity-Driven, Dense, Steady, Fluid–Particle Flows over Erodible Beds and Rigid, Bumpy Bases

Kinetic theory is used to propose and solve boundary value problems for fully developed, steady, dense gravity-driven flows of mixtures composed of identical inelastic spheres and water over both inclined erodible beds and rigid, bumpy bases confined by vertical sidewalls. We solve the boundary value problems assuming values of the mass density and of the size of the spheres typical of natural materials and show the numerical solutions for the profiles of the mean velocities of the particles and fluid, the intensity of the particle velocity fluctuations, and the granular concentration. In addition, we indicate how the features of the grain velocity fluctuations profile would influence segregation in three situations when the particle phase consists of two sizes of spheres: (1) the spheres are of the same material, and only gradients of temperature influence their segregation; (2) the mass densities of the material of the spheres are such that only gravity influences segregation; and (3) the mass densities are such that the coefficients of the temperature gradients and gravity segregation mechanisms are equal. For spheres of the same material, over a rigid bumpy base, the concentration of larger spheres increases from zero at the bed to the maximum value at the top of the flow; while over an erodible bed, this concentration has its maximum value at both the bed and the top of the flow.

Rich Poverty: 2 Corinthians 8.1–15 and the Social Meaning of Poverty and Wealth

AbstractThis article, originally presented as the Presidential Address at the 2022 SNTS Meeting in Leuven, explores the ways in which Paul configures giving and ‘wealth’, both in relation to the Macedonians and Corinthians (as contributors to the Jerusalem collection) and in relation to Christ. Drawing on the dream-interpretations of Artemidorus, it illustrates how ‘wealth’ could be understood in antiquity as performance rather than possession: one is wealthy in giving and not (or not only) in having. In this light, Paul offers a striking image of the Macedonians who in their poverty were ‘rich’ in their unreserved commitment to the collection, fulfilling the dream of the poor by acquiring the dignity of giving. The Christological statement of 2 Cor 8.9 can also be understood (and integrated) in a new way: it was in his wealth (of self-sharing) that Christ became poor (in the weakness of the cross), so that the Corinthians, participating in this momentum, might become ‘rich’ in the same self-giving of Christ. Although grace and money are not identical, neither are they unrelated ‘economies’: the grace of the Christ-event transforms its beneficiaries into givers, rich in multiple forms of generosity, including material gift. The text thus evidences principles of a non-competitive mode of social relations operative in the material sphere, with the capacity to stimulate a theological challenge to dehumanising forms of capitalism.

Heteroatom (N, P)-driven carbon nanomaterials for high-energy storage in supercapacitors

Nanoflower-like hollow carbon sphere (CS) materials with two different heteroatoms doping (N, P) were prepared by a simple synthetic method (NPCS). The specific surface area of NPCS can reach a high value of 396 m2/g. The NPCS has a high degree of hollowness and the self-assembled nanosheet of NPCS forms a fast electron transport channel, and also increases active area in contact with electrolyte. The doping of heteroatoms increases the defect level of the carbon-based nanomaterials and changes the local electron state of the material, thus forming storage sites on the surface of the material, which can be used as a station for ions collecting and distributing. The material was studied as an active material for supercapacitors, and the specific capacitance reached 274.9 F/g. After the 4000th cycle stability test, it still maintained 95.2% of the specific capacitance, indicating that the material has excellent properties of supercapacitor materials.

УКРАЇНА – РЕСПУБЛІКА КОРЕЯ: ВИКЛИКИ ТА ПЕРСПЕКТИВИ ЗОВНІШНЬОТОРГОВЕЛЬНИХ ВІДНОСИН

The paper focuses on the analysis of trade and economic relations between Ukraine and The Republic of Korea. The long-term trend of trade cooperation between the countries indicates the discrepancy between economic potentials and the modest indicators of trade in goods and services, as well as Ukraine's negative balance in bilateral foreign economic relations. The objective of the study is to highlight the current state, problems and prospects for the development of trade and economic relations between Ukraine and The Republic of Korea, which allows to prioritize the challenges that hinder the development of trade and economic relations between the two countries. Special attention is paid to overcoming institutional barriers and artificial obstacles by developing high moral and ethical values and eliminating the corruption component in Ukrainian society. It is justified that the current global economic crisis has demonstrated the deep gap between the material sphere and moral principles. It is emphasized that the crisis is global not only in the geographical aspect, but also in the substantive and systemic aspects since it is not only and not so much of economic nature as of axiological, thus in general can be defined as the economic-spiritual. It has been proven that overcoming the current crisis requires not only new economic mechanisms, but also new approaches that take into account spiritual, moral and other human values.

On the Variable Acceleration Motion of Falling Sphere in a Fluid Medium

Falling motion of a sphere in the stationary medium is an important basic research and has a wide range of engineering application prospects. This paper studies the free fall motion of spheres in a stationary medium considering air drag. This paper calculates the acceleration, velocity and displacement of the falling process of the sphere by Excel, and discusses the influence of the density, diameter and Re on the motion. Some analysis and fitting of displacement over time are performed. The results show that the varied-acceleration motion of the falling spheres is similar for different sphere materials, namely, the falling acceleration, the velocity and falling displacement all can be divided into three segmentations and fitted with polynomial functions. The relationship between displacement<i> h</i> and time <i>t </i>during falling with varied- acceleration is also greatly affected by the density of the sphere, the greater the density of the sphere, the closer the relationship between <i>h</i> and<i> t </i>during the fall process is closer to no drag free fall, the smaller the density of the sphere is, the closer the relationship between <i>h</i> and<i> t </i>is nearer to linear relationship. The displacement data of different solid material sphere is located between the fall of water and the free drop without drag, but does not meet power function or the multi-relationship function. Some results are compared with the literature experiments, and are consistent with the experiments.

Problematic Aspects of the Classification of Forensic Economic Examination

The theoretical-methodological foundations of the development of forensic economic examination regarding the determination of classification features of its species composition have not only theoretical-methodological, but also direct practical significance in the activities of expert economists, as well as judicial investigative bodies in the event that the latter appoint this type of examinations. This research paper’s purpose is to study the criteria for the classification of forensic economic examinations, established by soviet scientific thought, aimed at improving the systematization of their species composition. Using the techniques of analysis, synthesis, induction, deduction and generalization, it was determined that the emergence of new types and sorts of forensic economic examinations depends on factors that can be combined into two groups: 1) socio-economic relations — a change of their format; 2) judicial and investigative practice —emergence of new objects of research and tasks; 3) economic offenses — new ways, techniques of committing economic crimes. It has been established that the structural differentiation of this type of forensic examinations is due to the procedural needs of the judicial and investigative practice. It has been found that the criterion for systematization of the species composition of forensic examinations belongs to the economic plane, namely to the distribution of social production into the spheres of material and immaterial production. The next stage of the distribution of economic examinations is to the relevant industries according to certain types of activity with the definition of the main criterion of classification — according to the type of production activity. Thanks to this, compliance with the set of requirements for the scientifically based selection of classification criteria with the distinction of sorts and types of economic examinations is ensured.

Development of CORE Model-Based Mathematics Learning Videos For Grade VI Students at SDN 1 Kaba-Kaba

Media is helpful in providing meaningful learning activities through the application of the CORE (Connecting, Organizing, Reflecting, and Extending) model as a learning video scenario. This study aimed to determine the build design of the CORE model-based mathematics learning video and to determine the feasibility of the CORE model-based mathematics learning video for sphere material for sixth-grade students at SDN 1 Kaba Kaba. Media design used the ADDIE model (ADDIE (analyze, design, development, implementation, evaluation) as a step in the product development process. The study did not use a population or sample but used test subjects learning content experts, learning design experts, learning media experts, and grade VI students at SDN 1 Kaba Kaba. Data collection method used was a questionnaire method, observation, and interviews. The research data results were analyzed using a quantitative descriptive method by looking for the eligibility percentage in the learning process through the trial results. Thus, it generated learning video products, including as follows. There were design descriptions of the CORE model-based mathematics learning video development with stages of analysis, design, development, and evaluation. CORE model-based learning videos based on product trial results, including as follows. The assessment results of learning content experts with the acquisition of very good qualification percentage score (95.20%); the assessment results of the learning design expert with the acquisition of very good qualification percentage score (90.55%); the assessment results of the learning media experts with the acquisition of very good qualification percentage score (95.54%); and the student assessment results through individual trials obtained very good qualification percentage score (90.35%). Based on the trial results, it can be concluded that CORE model-based learning videos were feasible to use in the learning process.

Significance of Global Value Chain for the Fourth Industrial Revolution - A Meta Analysis and Systematic Literature Review

The fourth industrial revolution is characterized by numerous disruptive technologies. Technology is reshaping business practices, leading to an improved market opportunity that increases the demand for skills in innovation. Both technological and material spheres, as well as scientific study, are undergoing a fourth industrial revolution. There is a gradual integration of digital strategies into a growing number of businesses. AI is currently used to fill a growing number of professional positions, and thus, the gig economy is booming. The objective of the study is to examine the Global Value Chains and their significance for the Fourth Industrial Revolution for industrial development. It is concluded that developing countries will be empowered with vibrant human capital in a radically new world of work. Systematic Literature Review and Meta-Analysis, investigation is outlined research questions and addressed the gaps in the literature.

Heat transfer and storage characteristics of a hexagonal close structured packed-bed thermal storage system with molten salt phase change materials

The phase change material (PCM) spheres using 316SS as the ball shell and solar salt (NaNO3-KNO3, 60–40 wt%) as the PCM were arranged in an orderly pebble-bed arrangement. The charging performance, energy and exergy of PCM spheres in the packed ball thermal energy storage system (PBTES) were investigated using CFD simulation in order to solve the problem of heat storage at 300 °C–500 °C. The results show that the total melting time of PCM spheres slightly decreases from 1455 s to 1319 s with the inlet velocity increasing. The average heat storage efficiency of PCM spheres and PBTES are improved with the inlet temperature increasing. When the inlet flow rate increases from 0.01 m/s to 0.10 m/s, the energy efficiency of PBTES increases approximately 5.06 times, and the exergy efficiency increases from 17.91 % to 99.55 %. However the heat energy storage and exergy efficiency of PCM spheres are not affected by the inlet velocity changing. The energy efficiency of PBTES increases about 2.09 times, and the exergy efficiency increases from 30.29 % to 70.93 % with the inlet temperature grows from 300 °C to 500 °C. It provides an idea for the design of the medium-high temperature and high-efficiency molten salt PCM heat storage system.

Features of understanding social relations in modern law: theoretical, administrative, civil legal regulation

The purpose of the research was to redefine the concept of social relations from the point of view of its theoretical, administrative and civil aspects of legal regulation, considering, for this purpose, various scientific contributions. The main content is based on the meaning of the concepts of “public relations” and “social relations” as political and legal entities with different paradigmatic essence. The methodological basis of the research was constituted by the comparative-legal and systemic analysis, the formal-legal method, the method of interpretation, hermeneutics and the methods of analysis and synthesis. By way of conclusion the authors have established that the term “public relations” characterizes relations between people, which provide for the unconditional priority of the economy over other spheres of society (political, ideological, cultural), material and symbolic spaces where there is no place for a person with his values, rights and freedoms. At least, the latter do not acquire due regulatory support.

The role and place of the advocacy institute in the mechanism of protection of human and citizen rights and freedoms

It is indicated that a person in a democratic, legal state is the highest social value, which plays a decisive role in all spheres of material, political, social, spiritual and cultural life. At the same time, each person is individual, original, unique, unique. Its participation in the activities of the legal state depends on the material and spiritual capabilities in the use of its subjectiverights and the voluntary performance of its legal obligations. The legal status of a person consists in his rights, freedoms, and obligations established by legislation, which represent opportunities that turn into reality through their practical implementation.&#x0D; The authors highlight certain features of the constitutional and legal status of the Institute of Advocacy. The specificity of the legal nature of the institution of advocacy in the mechanism of protection of human and citizen rights and freedoms is determined. The place and role of the legal profession among other state authorities has been established.The authors come to the conclusion that the institution of advocacy in the mechanism of protection of the rights and freedoms of a person and citizen is one of the means for self-limitation of state power through the creation and active functioning of an independent human rights institution, which is an active actor in the process of implementing the main constitutional functionof the state - the implementation and protection of rights and freedoms person and citizen. The constitutional and legal status of the bar allows it to actively ensure the rights of not only every person, but also of the entire civil society, to effectively implement the human rights function of the state by ensuring proper interaction in the activities of state authorities and civil society.&#x0D; The main features of advocacy that reveal its essence in the mechanism of providing legal aid are: 1) advocacy acts as a separate human rights institution; 2) the bar actively interacts with state authorities and institutions of civil society as anequal partner in the mechanism of protection of human and citizen rights and freedoms; 3)as part of their professional duty to protect the rights and interests of their clients, lawyers play a significant role in the fair administration of justice. Being an active participant in the mechanism of law enforcement, occupying an independent place in the mechanism of justice, the bar performs (should perform) an important function of public control in this area.

Countercurrent moving bed carbonator for CO2 capture in decoupled calcium looping systems

Calcium Looping can be a suitable technology to address the CO2 capture from disperse flue gas sources, including shipping, by decoupling carbonation and calcination steps and by using the CaCO3 as CO2 transport media. In this work we present the design of a moving bed carbonator especially suited for these applications. The Ca-sorbent material (porous CaO or Ca(OH)2 in the form of pebbles or pellets) is fed to the top of the reactor at ambient conditions and is preheated by the gases leaving the reactor. Then the carbonated solids leave the reactor at the bottom at a temperature close to that of the inlet gases. A basic countercurrent reactor model has been developed to identify operational windows and other suitable conditions to achieve optimum carbonation temperatures of 600–700 °C in the central carbonation zone of the reactor. Gas velocities of 1–3 m/s and solid residence times in the carbonation zone of between 2 and 13 h are needed to carbonate spheres of Ca-based materials of 1 to 2 cm up to its maximum conversion of 0.6 for CaO and 0.8 for Ca(OH)2. The thermal and mechanical similarities of the proposed reactor with those of shaft kilns should accelerate the scaling up of this new reactor concept.

Locomotion through soft materials of paired solid spheres as a miniature robot

Locomotion of a small device through soft media such as living tissue remotely actuated by magnetic field is analyzed. The device consists of two differently sized magnetized or magnetizable spheres of millimeter or sub-millimeter diameter interacting with each other magnetically, but otherwise disconnected from each other. The magnetic field transfers energy to the pair by changing direction and magnitude, while the pair executes a reversible motion gait by increasing and decreasing the distance between the sphere centers. The locomotion model is based on previously developed model of solid sphere motion through soft medium.

PERSON IN A DIGITAL SOCIETY: TRIUMPH AND TRAGEDY

Human civilization is moving into the digital age. Many believe that total digitalization is bringing humanity closer to the dream age of general wellbeing and happiness. However, although there is a real revolution in the knowledge and mastering of the world, the tension and conflicts within human society do not stop, and people do not feel happier. This determines the aim and the tasks of the research, which are based on the analysis of deep contradictions and conflicts existing in modern society, including military conflicts, to find out the factor of consciousness in their emergence and development, as well as the role and significance of information and communication technologies in formation of positive or negative trends. The research methodology has a complex nature and is based on a philosophical and cultural analysis of the problems of the influence of digitalization on the formation of the consciousness of our contemporary, which leads to constructive or destructive directions of the development of society. To solve the specific tasks of the research, the principles of historicism, systematicity, objectivity, the connection of the historical and the logical were also used.Research results: The reasons for deep contradictions tearing modern societylie, first of all, in the material sphere. However, the possibilities of the extensive path are practically exhausted today, it is necessary to go in the direction of improving the mental sphere, to look for new ideas that could help to find new opportunities for the further development of human civilization. However, this is where one of the main conflicts of our time arises, namely: the human consciousness, which is intended for the production of constructive ideas and solutions, is often directed in the exact opposite direction, towards destruction and violence. The search for reasons and discussions on this matter have not stopped for many decades and are becoming increasingly acute.Discussion. The most contradictory human consciousness manifests itselfin the conditions of war. One of the main causes of wars and military conflicts is the deformation of people’s consciousness, the mental sphere at the local and global levels. Modern information and communication technologies create great opportunities to shape human consciousness with given properties, to direct it in one direction or another. Modern highly developed societies, where democracy reigns and the Global Network plays a huge role, seem to be the territory of freedom and pluralism. However, precisely thanks to digital technologies, the satisfaction of spiritual needs has turned into a kind of mass production, when tastes are lowered below the lowest level, and worthy things are replaced by informational surrogates.Conclusions. In order to be able to distinguish a high-quality informationproduct from a fake, veiled or outright lie, a fairly high level of intellectualdevelopment of the individual is required. It is necessary to form an own information environment, where priorities will be clearly defined, as well as curtains and mental filters will be installed, which do not allow the penetration and accumulation of unnecessary and harmful information. The triumph of man in the modern information and digital age lies in the fact that we have reached the level of a society of mass information consumption. But the tragedy is that people were not ready for such a rapid turn in the development of our civilization. There is a real risk of losing one’s humanity, turning not into spiritual beings, but into something similar to machines, homo technologicus, for whom not only higher spiritual needs disappear, but also the value of life in general. In order to avoid a negative scenario, it is necessary to seriously revise the attitude to information, to make information hygiene at all levels the norm of our life.

Old Time String Band: Sound, vision, and memory in the work of Stanley Greaves

ABSTRACT Guyanese artist Stanley Greaves (1934–present) stands among the Caribbean’s leading creative figures, with a diverse production stretching across seven decades and incorporating painting, sculpture, and illustration, alongside poetry and music. His career encompasses associations with many of Guyana’s major cultural personalities and movements, including artist ER Burrowes and the Working People’s Art Class, novelists Wilson Harris and Edgar Mittelholzer, and poet Martin Carter. Despite its significance, his work attracts little analysis outside the Caribbean. This essay provides an extended investigation into one of Greaves’s most important and personal paintings, Old Time String Band (1977), through the overlapping thematics of sound, vision and memory. Based on extensive correspondence with Greaves, it explores the working class foundations of his creative practices across sonic, visual and material spheres, using memory as a primary tool to illuminate essential cross-overs and transnational resonances within Guyana’s artistic and musical cultures from pre-Independence to postcolonial eras.