Areas Of Science Research Articles

Impact of porous material and slip condition on the MHD flow of immiscible Couple stress-Newtonian fluids through an inclined channel: Head loss and pressure difference

Nowadays, non-Newtonian and Newtonian non-miscible fluid flow problems are much more effective in real-life physical problems. The understanding of flow behavior of magneto-hydrodynamic non-miscible fluids through a porous region playing an important role in the areas of biochemical sciences, crude oil extraction, transport issues and biomedicine. The aim of the present study is to know the impact of inclination angle of the channel, porous material used in the channel, slip boundary condition and applied magnetic field on the flow variables such as velocity profile, wall shear stress, pressure differences, head loss and volumetric flow rate of the two electrically conducting non-miscible couple stress and Newtonian fluids flowing through an inclined channel occupied with porous material of different porosity and permeability. An inclined channel is divided into two sub-regions of equal width through which the Newtonian and Couple stress fluids flow, respectively. Here, Brinkman’s model has been used to study the flow of immiscible fluid in their respective porous region. The equations that govern the flow of non-miscible fluids are solved using a well-defined analytical method and Mathematica 10.3 software. The present study concludes that the porous materials can be used to control the velocity of immiscible fluids in an inclined channel. It is also concluded from the present study that the use of slip condition promotes the values of velocity, volumetric flow rate, pressure differences and head loss. This work is validated with the previously published research work. Such models can be helpful in industries for filtering or refining immiscible oils.

Ядерно-физическая медицинская элементология как раздел медицинской радиологии

Purpose: Medical elementology and its subsection nuclear physics medical elementology, as the most important areas of biomedical science, are still insufficiently included in the arsenal of medical radiology as a fundamental basis for the development and use of new methods for diagnosing and treating various diseases, including oncological ones. For the successful establishment of nuclear physics medical elementology as a new scientific discipline, it is necessary to develop a clear methodology for its further development. Results: The definition of the subject of research and the main postulates of medical elementology is given. The close interrelation of knowledge about the content and metabolism of chemical elements, as well as their radioactive and stable isotopes, with the needs of medical radiology is shown. The following areas of research are considered: 1) The use of chemical elements, as well as their radioactive and stable isotopes in medicine; 2) Visualization of organs and tissues, as well as in vivo determination of the content of chemical elements in them; 3) Nuclear physical methods for determining chemical elements in samples of tissues and fluids of the human body in solving oncological problems; 4) The role of chemical elements in calculating absorbed doses during radiotherapy; 5) The use of nuclear physical methods in the formation of groups at increased risk of cancer. A range of modern nuclear physics analytical methods acceptable in clinical practice and as an adequate research tool is outlined. The need for the integrated use of nuclear physics analytical technologies to obtain reference values ​​for the content of chemical elements in various organs, tissues and fluids of the human body in normal and various pathological conditions, as well as to organize the strictest quality control of measurements and unify methodological approaches is demonstrated. The modern possibilities of using the achievements of nuclear physics medical elementology in solving the problems of medical radiology are determined and the priorities for the future are outlined. Conclusion: The steady development of nuclear physical methods of chemical elements analysis and their implementation in medicine is constantly expanding the scope of possibilities of medical elementology. The development of this area will certainly make a significant contribution to the future successes of medical radiology.

A Jump-Gain Integral Recurrent Neural Network for Solving Noise-Disturbed Time-Variant Nonlinear Inequality Problems.

Nonlinear inequalities are widely used in science and engineering areas, attracting the attention of many researchers. In this article, a novel jump-gain integral recurrent (JGIR) neural network is proposed to solve noise-disturbed time-variant nonlinear inequality problems. To do so, an integral error function is first designed. Then, a neural dynamic method is adopted and the corresponding dynamic differential equation is obtained. Third, a jump gain is exploited and applied to the dynamic differential equation. Fourth, the derivatives of errors are substituted into the jump-gain dynamic differential equation, and the corresponding JGIR neural network is set up. Global convergence and robustness theorems are proposed and proved theoretically. Computer simulations verify that the proposed JGIR neural network can solve noise-disturbed time-variant nonlinear inequality problems effectively. Compared with some advanced methods, such as modified zeroing neural network (ZNN), noise-tolerant ZNN, and varying-parameter convergent-differential neural network, the proposed JGIR method has smaller computational errors, faster convergence speed, and no overshoot when disturbance exists. In addition, physical experiments on manipulator control have verified the effectiveness and superiority of the proposed JGIR neural network.

Applications of surface‐grafted polymer brushes with various architectures

AbstractSurface‐grafted polymer brushes (PBs) are a versatile class of thin coatings that exhibit unique properties due to their densely grafted polymer chains. PBs are typically formed through surface‐initiated polymerizations, particularly reversible deactivation radical polymerizations, and macromolecules adopt extended conformations that differentiate them from classical polymer films. This review explores various applications of PBs, emphasizing their macromolecular ordering, dynamic conformational changes, anisotropic properties, and so forth. The growing interest in utilizing PBs for functional coatings is discussed in various fields, including electronic, biological, and environmental applications. In electronic applications, PBs find relevance in photovoltaics, energy storage devices, organic light‐emitting diodes, and organic electronics, showcasing their potential in advancing electronic technologies. In biological applications, they contribute to the formation of antifouling and antibacterial coatings, as well as superior lubrication and cellular adhesion, making them valuable in biomedical settings. Other applications include biosensors, bioimaging systems, and drug delivery systems, highlighting their significant contributions to medical advancements. Additionally, PBs play an important role in environmental applications such as water and wastewater treatment. A variety of recent examples of the applications of surface‐grafted PBs are presented, providing insights into their unique properties and architectures that contribute to their success in demanding areas of science and technology.

ПОДХОДЫ К РЕШЕНИЮ ПРОБЛЕМЫ ДОСТОВЕРНОСТИ ВОСПОМИНАНИЙ О ПЕРЕЖИТОМ В ДЕТСКОМ ВОЗРАСТЕ ЖЕСТОКОМ ОБРАЩЕНИИ

The article provides an overview of the theoretical foundations that allow a reasonable approach to assessing the reliability and accuracy of memories of traumatic events, in particular, abuse experienced in childhood. Solving the problem of accuracy and reliability of memories of abuse experienced in childhood requires simultaneous taking into account both the patterns of functioning of autobiographical memory and the peculiarities of the formation of individual traumatic memory. The most plastic components of autobiographical memory are the temporal localization of specific memories and the plot sequence of individual events within an entire episode. Autobiographical recollections of characters within a certain personally significant situation in the past are little subject to change. Victims of repeated violent acts may not remember the details of each specific episode, but they form a kind of ‘scheme’ or ‘script’ that includes characteristic elements of what happened to them. Such a ‘script’ has a high degree of accuracy and is subject to little change over time. The study of the basis for assessing the accuracy and reliability of memories of traumatic events is relevant for various areas of science and practice: from statistical estimates of the prevalence of violence against children and adolescents to law enforcement practice in situations of violent acts against children.

Numerical Solution of Two-Dimensional Nonlinear Unsteady Advection-Diffusion-Reaction Equations with Variable Coefficients

The advection-diffusion-reaction (ADR) equation is a fundamental mathematical model used to describe various processes in many different areas of science and engineering. Due to wide applicability of the ADR equation, finding accurate solution is very important to better understand a physical phenomenon represented by the equation. In this study, a numerical scheme for solving two-dimensional unsteady ADR equations with spatially varying velocity and diffusion coefficients is presented. The equations include nonlinear reaction terms. To discretize the ADR equations, the Crank–Nicolson finite difference method is employed with a uniform grid. The resulting nonlinear system of equations is solved using Newton’s method. At each iteration of Newton’s method, the Gauss–Seidel iterative method with sparse matrix computation is utilized to solve the block tridiagonal system and obtain the error correction vector. The consistency and stability of the numerical scheme are investigated. MATLAB codes are developed to implement this combined numerical approach. The validation of the scheme is verified by solving a two-dimensional advection-diffusion equation without reaction term. Numerical tests are provided to show the good performances of the proposed numerical scheme in simulation of ADR problems. The numerical scheme gives accurate results. The obtained numerical solutions are presented graphically. The result of this study may provide insights to apply numerical methods in solving comprehensive models of physical phenomena that capture the underlying situations.

The Understanding of Scientific Inquiry by Teachers in Initial Training: A Comparative Study between Brazilian and Portuguese Undergraduates

Understanding the relevant aspects of the construction of knowledge in science, as well as the elements that are an essential part of a scientific inquiry, need to be discussed in teacher training courses in the area of natural sciences. This study aimed to identify and classify investigative elements present in the conceptions of undergraduates from a university in Brazil and another in Portugal who will be working in basic education. This is a qualitative study using content analysis to identify categories based on the students’ responses, and a quantitative approach using descriptive statistics to quantify the absolute frequency of each response. The data were obtained during a preparatory course on inquiry teaching given to 30 undergraduates from both countries in 2023 through the analysis of a problem situation involving forensic entomology. The results showed that the most frequent investigative elements present in the students’ answers are the problem, the formulation of hypotheses, the collection, analysis, and interpretation of data, and the conclusion.

Изучение технологии синтеза металлокерамического материала системы AlxFeySi

The current stage of development of the metal products market dictates the need to search for new materials with an improved set of performance characteristics using high technologies and publicly available raw materials. One of the promising materials with an attractive set of properties is ceramics of the MeSi type (silicides). Materials from this group have high hardness and wear resistance. The study of alloys of the Al-Si system containing elements such as iron, copper, manganese is one of the promising areas in metallurgy and materials science. To solve the problem of improving the quality of aluminum-based parts, it was decided to use AlxFeySi composite ceramic material. In this work, using the principles of additive technologies, an experimental batch of metal-ceramic materials is obtained, which has a typical cast microstructure with a set of phases inherent in the system under consideration. It was found that the hardness of the resulting material is 541.7 Vickers units, exceeding the hardness of the steel-substrate by 2 times

Identifying System Non-Linearities by Fusing Signal Bispectral Signatures

Higher-order statistics investigate the phase relationships between frequency components, an aspect which cannot be treated using conventional spectral measures such as the power spectrum. Among the widely used higher-order statistics, the bispectrum ranks prominently. By delving into higher-order correlations, the bispectrum offers a means of extracting additional merits and insights from frequency coupling, enhancing our understanding of complex signal interactions. This analytical approach overcomes the limitations of traditional methods, providing a more comprehensive view of the complex relationships within the frequency domain. In this paper, the extensive use of the bispectrum in various scientific and technical areas is firstly emphasized by presenting very recent applications. The main scope of this work is to investigate the consequences of various non-linearities in the creation of phase couplings. Specifically, the quadratic, the cubic and the logarithmic non-linearities are examined. In addition, simple recommendations are given on how the underlying nonlinearity could be detected. The total approach is novel, considering the capability to distinguish from the bispectral content if two non-linearities are simultaneously present.

Study of metrological characteristics of the state primary measurement standard of volume flow and mass consumption of liquid in preparation for participation in international comparisons

The paper discusses the results of a study of metrological characteristics of the state primary measurement standard of volume flow and mass consumption of liquid, as well as the volume and mass of liquid flowing through pipelines (DETU 03-04-04). The study was conducted at the National Scientific Centre “Institute of Metrology” in preparation for international comparisons. Metrological characteristics of the components of the state measurement standard were studied, including the stability of the flow by experimentally determining the standard measurement uncertainty of the mass consumption of liquid at the measurement section of the standard. Based on the obtained results, the measurement standard was modernized. In addition, the paper discusses possible directions for further research aimed at improving measurement methods and analysing the measurement uncertainty of Type A. Further work in this direction can contribute to increasing the competitiveness across the national and international metrological community. The paper also examines the procedure for processing measurement results during international comparisons and identifies basic requirements for complying with international standards for further research of the measurement standard to meet these requirements.
 Metrological comparisons are an important part of metrology, as they ensure the equivalence of measurement units, which is essential for ensuring uniformity of measurements in various industrial and scientific areas. Such measures do not only promote scientific progress, but also ensure high standards of quality and safety in modern society. The results of this research will help to prepare for international comparisons, which are important for comparing measurement units. This, in turn, will contribute to more efficient transfer of measurement units to secondary measurement standards and measuring instruments.

Cybernetic governance: implications of technology convergence on governance convergence

Governance theory in political science and international relations has to adapt to the onset of an increasingly digital society. However, until now, technological advancements and the increasing convergence of technologies outpace regulatory efforts and frustrate any efforts to apply ethical and legal frameworks to these domains. This is due to the convergence of multiple, sometimes incompatible governance frameworks that accompany the integration of technologies on different platforms. This theoretical claim will be illustrated by examples such as the integration of technologies on the “human platform” as it is referred to in the case of enhanced soldiers. Hence, successful governance might require new approaches borrowed from a distant relative, namely cybernetics. Insights gained from cybernetics for governance theories might be able to give guidance for a more efficient and adaptive governance approach that is able to deal with increasing complexity caused by technology and governance convergence. While cybernetics itself might be considered a governance approach, it has had surprisingly little reception in the wider field of governance within the area of social and political sciences. This article will develop cybernetic governance as a set of expandable governance principles that are applicable to an increasingly complex digital and smart society. It thereby tries to further galvanise what could be termed cybernetic governance theory as a subject of worthwhile insights from the combination of otherwise largely the disjoined fields of cybernetics and governance.

About Polish forensic medicine based on archival material described in scientific literature.

The need for medical assessment of murder victims and the establishment of rules for this assessment became the driving force behind the creation of forensic medicine, while the non-medical area of crime assessment, including crime scene examination, became the driving force behind the creation and development of criminalistics. Polish forensic medicine has been developing for over 200 years, and the Kraków Chair of Forensic Medicine is the oldest unit of this type. It is therefore not surprising that the archive which collects protocols of expert and scientific research is quite extensive. This material is a valuable foundation for scientific work including not only numerous publications in national and international journals, but also books. The author of the work selected several books on medical and forensic topics that appeared in recent decades on the Polish publishing market, indicating the value and importance of archival material in the literature of this area of science.

OCCUPATIONAL HEALTH AND SAFETY AS AN AREA SAFETY ENGINEERING

The publication deals with the issue of safety engineering and occupational health and safety interms of the areas of knowledge, education and science. Safety engineering is an area of knowledge,an area of education (field of higher studies), an area of science (a new discipline in the fieldof engineering and technical sciences). On the other hand, occupational health and safety is anarea of knowledge (e.g.: occupational health and safety service, legal information, standardizationinformation, industry information), an area of education (e.g.: training in the field of occupationalhealth and safety, occupation of an occupational health and safety technician, field of higherstudies, postgraduate studies), yet it is not an autonomous area of science as an independentscientific discipline (it has a chance of becoming a research area or scientific specialty in thediscipline of safety engineering). The scope of the publication comprises selected aspects of safetyengineering, selected aspects of occupational health and safety and a review of requirements in thefield of occupational risk assessment. The research and analyses included publicly available datain the field of higher education and science system (including: POL-on system, RAD-on system,Polish Science database, website of the Council of Scientific Excellence): universities offering fieldsof study in safety engineering and occupational health and safety, entities and persons conductingresearch activities in safety engineering, entities authorized to award doctoral degrees andhabilitated doctor degrees in safety engineering, persons declaring scientific specialties in safetyengineering and occupational health and safety. In the higher education and science system, thefollowing were identified: two entities authorized to award doctoral degrees and habilitated doctordegrees in safety engineering (the Fire University, the WSB University), nine entities conductingscientific activities in the discipline of safety engineering and 113 people conducting scientificactivities in the discipline of safety engineering (people with at least a doctoral degree, including13 people with the academic title of professor and 32 people with the academic degree of associateprofessor).

The beginnings of American forensic medicine and criminalistics in the journalistic interpretation of Bruce Goldfarb - review of the book „18 Tiny Deaths: The Untold Story of Frances Glessner Lee and the Invention of Modern Forensics”

American forensic medicine is about 100 years younger than the European one. It was in Europe that at the beginning of the 20th century, American doctors were trained and gradually expanded the field of science and expertise in forensic medicine and criminalistics. This area, for several centuries under the English law, which was in force there, had been successively „mummified” by coroners who worked for years to earn their bad reputation. The outstanding American journalist Bruce Goldfarb writes about the emergence of forensic medicine and criminalistics in the reality of the United States of America and the pioneering role of the „forensic architect” Frances Glessner Lee in his book entitled „18 Tiny Deaths: The Untold Story of Frances Glessner Lee and the Invention of Modern Forensics”. This is an extremely interesting book worth recommending to anyone interested in expanding their knowledge in this area of science.

Nanoencapsulation of natural products and their role in the preservation and control of contaminations in the food industry

Microbial resistance is a problem of high notoriety and importance, being investigated in several scientific areas. Directly correlated to the abuse of macrolides in the pandemic context, the difficulty in eliminating resistant microorganisms and the control of bacterial contamination in an industrial food environment have been increasingly worrying nowadays. The present study demonstrates hypotheses of microbial control using the encapsulation of essential oils and products of natural origin through the technology used in nanocomposites. The aid in the prevention and control of microorganisms with high antimicrobial resistance factors in food industry environments can be seen. Furthermore, new approaches and themes applied in the denaturation of pathogenic biofilms and nanoencapsulation and the use of common metals and transition metals are highlighted.

Advancing health equity in cancer survivorship research: National institutes of health 2017-2022 portfolio review.

Communities and researchers have called for a paradigm shift from describing health disparities to a health equity research agenda that addresses structural drivers. Therefore, we examined whether the cancer survivorship research portfolio has made this shift. We identified grants focused on populations experiencing health disparities from the National Institutes of Health (NIH) Cancer Survivorship Research Portfolio (N = 724), Fiscal Years 2017-2022. Grant characteristics were abstracted, drivers of health disparities were mapped onto the levels and domains of influence, and opportunities for future research were identified. A total of 147 survivorship grants focused on health disparities were identified, of which 73.5% of grants focused on survivors from racial and ethnic minoritized groups, 25.9% living in rural areas, 24.5% socioeconomically disadvantaged, and 2.7% sexual and gender minority groups. Study designs were 51.0% observational. 82.3% of grants measured or intervened on at least one individual-level of influence, compared to higher levels of influence (32.7% interpersonal, 41.5% institutional/community, and 12.2% societal). Behavioral and healthcare system domains of influence were commonly represented, especially at the individual level (47.6% and 36.1%, respectively). Less frequently represented was the physical/built environment (12.2%). NIH-funded cancer survivorship research on health disparities is still focused on individual-level of influence. However, the proportion of grants examining structural and social drivers as well as the mechanisms that drive disparities in healthcare and health outcomes among cancer survivors have increased over time. Gaps in funded research on specific populations, cancer types, and focus areas of survivorship science were identified and warrant priority.

Antioxidant Activity and DFT Calculations of Metal Complexes Derived from a Schiff Base Ligand: Synthesis, Characterization, and Biological Evaluation

AbstractMetal complexes derived from Schiff bases are known to have a wide range of applications, spanning the areas of material and medicinal sciences. Herein, a Schiff base ligand, (Z)‐2‐(((4‐chlorophenyl)imino)methyl)naphthalen‐1‐ol HL, was synthesized via a condensation reaction between 2‐hydroxy‐1‐naphthaldehyde and 4‐chloroaniline using methanol as a solvent in the presence of a catalytic amount of formic acid. The obtained ligand was further reacted with Mn(II), Ni(II), and Cu(II) using their acetate salts in a 1 : 2 stoichiometric ratio of metal to ligand to afford complexes C1–C3, respectively. Physicochemical and analytical techniques consisting of FTIR, UV‐Vis, elemental (CHN and metal content), TGA, HRMS, 1H, and 13 C NMR spectroscopy were deployed to establish the formation of the compounds. Results show that the ligand coordinated with the metal ions through the oxygen and nitrogen atoms of the phenolate and azomethine moieties, respectively, forming ON‐type complexes. Furthermore, the free ligand and its complexes were evaluated for their antioxidant activity compared to the standard (ascorbic acid) using an in vitro DPPH radical scavenging assay. From this investigation, C1 demonstrated higher radical scavenging activity than the free ligand, the complexes, and the standard (ascorbic acid). But the ligand has better scavenging activity than C2 and C3 at higher concentrations. DFT was also used to examine the electronic properties of the compounds, and the data obtained corroborated well with the experimental study.

Convergence of non-linear diagonal frame filtering for regularizing inverse problems

Inverse problems are key issues in several scientific areas, including signal processing and medical imaging. Since inverse problems typically suffer from instability with respect to data perturbations, a variety of regularization techniques have been proposed. In particular, the use of filtered diagonal frame decompositions (DFDs) has proven to be effective and computationally efficient. However, existing convergence analysis applies only to linear filters and a few non-linear filters such as soft thresholding. In this paper, we analyze filtered DFDs with general non-linear filters. In particular, our results generalize singular value decomposition-based spectral filtering from linear to non-linear filters as a special case. As a first approach, we establish a connection between non-linear diagonal frame filtering and variational regularization, allowing us to use results from variational regularization to derive the convergence of non-linear spectral filtering. In the second approach, as our main theoretical results, we relax the assumptions involved in the variational case while still deriving convergence. Furthermore, we discuss connections between non-linear filtering and plug-and-play regularization and explore potential benefits of this relationship.

Анализ инновационного развития отраслей российской экономики

The coming decade in Russia has been declared the decade of science and technology, the goal of which is to achieve leading positions in a number of breakthrough industries. It is known that before the collapse of the Soviet Union, Russia was a leader in space, nuclear energy, electronics, and certain types of high-tech industries. With the collapse of the USSR, Russian science, despite the adoption of the Federal Law “On Science and State Scientific and Technical Policy” [12], entered a ten-year period of destruction, which resulted in the loss of leading global positions in the field of science and an almost fourfold reduction in the areas of scientific research: so, if before 1992 the Russian Federation had a backlog of 95% of the world’s scientific areas, then by 2005 our country had a backlog of 23-25% of the world’s scientific areas. Since the mid-2000s. with the adoption of a number of laws and the beginning of the implementation of a package of new initiatives [11; 10; 13] managed to ensure positive dynamics in a number of innovation-oriented sectors of the economy and science. Active government policy and significant investments in the science and research sector allow Russia to maintain the fifth largest number of scientific personnel in the world. In turn, the developed human potential of science will contribute to achieving the goals of the Concept of Technological Development for the period until 2030 [7]. The article shows the features of the current stage of innovative development in the context of types of activities, identifies negative trends in reducing the level of competitiveness of innovative activities in the science and development sector, and substantiates the conclusion about the need to restore the planned parameters of scientific and technological development for the purpose of technological modernization of sectors of the Russian economy.

ATTITUDES TOWARDS THE MARRIAGE OF MARY TUDOR AND PHILIP OF HABSBURG IN ENGLISH AND EUROPEAN SOCIETIES

A comprehensive study of the rulers matrimonial policy in the early Modern period is one of the most relevant and important areas in historical science. Some questions related to clarifying the significance and influence of the marriage between Mary Tudor and Philip of Habsburg on the foreign and domestic policy of England are still debatable. The purpose of the study is to clarify the importance of a dynastic marriage as an integral part to the political system of the leading countries of medieval Europe, to study the prerequisites, causes and consequences of the marriage between Mary Tudor and Philip of Habsburg. Materials and methods. The article is based on the study of written sources of the era under study and modern scientific literature. The work uses both general scientific and particular methods of historical research: the method of analysis, ideographic and synchronization method. Study results. The article focuses on considering the attitude to the marriage between Mary Tudor and Philip of Habsburg, the future king of Spain (1556–1598). The emphasis is placed on the conditions of marriage, the content of the prenuptial agreement, which caused unrest in the English society. Conclusions. The marriage of Mary Tudor and Philip of Habsburg was traditionally negatively assessed by historians. It was believed that it was the reason for deterioration of relations with France, tougher domestic religious policy. This union caused discontent among both Catholics and Protestants. However, there are positive aspects: the marriage of Queen Mary with Philip was successful for England, since an alliance with the strongest and the richest country in Europe at that time was the only way out for England, which was in a difficult economic situation, and the war with France allowed to distract attention from religious disagreements in the country.