Dynamic Phenomena Research Articles

Increasing obsidian diversity during the Chalcolithic Period at Yeghegis-1 Rockshelter (Armenia) reveals shifts in land use and social networks

The newly excavated rockshelter of Yeghegis-1 in Armenia reflects an occupation of five centuries, as attested by radiocarbon dates from ∼ 4100 to 4000 cal BCE in the lowest layer to ∼ 3600–3500 cal BCE at the top. It is a partially collapsed cave in which pastoralists, we hypothesize, wintered with their herds. The stone tool assemblage is predominantly obsidian (92.1%), despite the shelter being > 60 km on foot from the nearest sources. We use obsidian sourcing to investigate two purported trends in the Southern Caucasus during the Chalcolithic Period: (1) occupation of more varied high-altitude environments and (2) more expansive social networks. Our data show both trends were dynamic phenomena. There was a greater balance in use of the nearest pasturelands over time, perhaps linked to risk management and/or resource sustainability. During later occupations, artifacts from distant sources reveal more extensive connections. This increase in connectivity likely played a central role in the shifts in societal complexity that gave rise to widely shared material culture throughout the Armenian Highlands around the start of the Early Bronze Age. In such a model, greater social connectivity becomes a key mechanism for, rather than a product of, the spread of cultural and/or technological innovations.

Computational Protocol for the Spectral Assignment of NMR Resonances in Covalent Organic Frameworks.

Solid-state nuclear magnetic resonance spectroscopy is routinely used in the field of covalent organic frameworks to elucidate or confirm the structure of the synthesized samples and to understand dynamic phenomena. Typically this involves the interpretation and simulation of the spectra through the assumption of symmetry elements of the building units, hinging on the correct assignment of each line shape. To avoid misinterpretation resulting from library-based assignment without a theoretical basis incorporating the impact of the framework, this work proposes a first-principles computational protocol for the assignment of experimental spectra, which exploits the symmetry of the underlying building blocks for computational feasibility. In this way, this protocol accommodates the validation of previous experimental assignments and can serve to complement new NMR measurements.

Research on impact vibration response of hinged fluid-conveying pipe with bilateral gap constraints

Factors such as loose supports or barriers over the fluid-conveying pipe may cause bilateral gap constraints. Flow-induced vibration will occur during pumping, which leads to collision between the pipe and the constraints. A piecewise linear spring model with large stiffness is employed to simulate the collision process between the pipe and the constraints, and numerical simulation is carried out for the collision of hinged fluid-conveying pipe with the bilateral gap constraints. The dynamic characteristics of hinged fluid-conveying pipe with pulsating internal flow excitation and bilateral gap constraints during impact vibration are studied. Influences of various parameters including frequency, average flow rate of the pulsed internal flow excitation, position of the bilateral constraints, and gap dimensions on the system are investigated. Three paths are found for the pipe system entering chaotic window from stable periodic motion: entering chaotic window after the occurrence of period-double bifurcation, transitioning into chaotic window after developing almost periodic motion, and jumping into chaotic window directly. If the distance between two constraints is closer, the pipe between the constraints will be subject to stronger constraints during the collision process, which can cause the system to enter chaos easily. Many dynamic phenomena have been observed, such as a sliding bifurcation when periodic incomplete chattering-impact developing periodic complete chattering-impact, strong centrosymmetric properties in the bifurcation diagram and the Poincaré map at the mid-point of the pipe, jumping between stable periods, period-double vibration response, inverse period-double vibration response, grazing motion, and viscous motion.

Computer Аssessment of the Risk of Нerniated Protrusions of the lntervertebral Discs of the Neck Based on MRl Data

The purpose of the research is assessment of the risk of herniated protrusions of intervertebral discs C4-C5, C5-C6 and C6-C7 of the cervical spine according to MR/ examination.Methods. Тhe biomechanics of the physiological processes of this department has been studied on the basis of MR/ data. A computer program «A method for assessing the risk of herniated protrusions of intervertebral discs of the cervical spine based on the results of an MRI examination» has been developed and tested. The measurements required for the above assessment were obtained during the evaluation of the MR/ examination of a particular patient, after which the data was entered into the program. Тhe calculation results were compared with the database previously obtained by the authors in the course of experimental and clinical studies.Results. Тhe model we use correctly describes the mechanical features of the vertebral junction, since it takes into account the most significant features of their structure, which affect the change in the length of the arms of the levers and the force of pressure on the center of the intervertebral disc. Based on magnetic resonance imaging data, the height of the intervertebral disc at the level of the anterior edges of the vertebral bodies and the АV value were determined, and tg was calculated. For a particular patient, the risk of intervertebral disc protrusion was obtained at the C4-C5, C5-C6 and C6-C7 levels.Conclusion. Тhe test results of the program for assessing the risk of developing an intervertebral disc protrusion in the cervical spine make it possible to describe dynamic phenomena in the cervical spine and predict an unfavorable outcome of pathology at the preclinical stage, even in the absence of clinical manifestations.

The influence of culture on the entrepreneurial behavior of women: A Review Paper

The rise of female entrepreneurs is a significant development, as they play a crucial role in driving economic growth. This is especially important in developing countries like Nepal, where it can also help to reduce unemployment. However, many women entrepreneurs need help with their cultural environment when starting or managing their businesses. This paper explores the multifaceted impact of culture on the entrepreneurial behavior of women. Entrepreneurship is a dynamic and complex phenomenon influenced by various factors, and cultural context plays a crucial role in shaping an individual’s attitudes, motivations, and decisions. The study focuses specifically on how cultural dimensions such as societal norms, gender roles, and cultural values interact to shape women’s entrepreneurial behavior. The research methodology involves a comprehensive review of the existing 50 articles on women's entrepreneurship and their sociocultural intervention on the behavior of women entrepreneurs. The findings reveal that cultural factors significantly influence women’s entrepreneurial intentions, risk perceptions, and business strategies. Societal expectations and gender norms can either facilitate or hinder women’s entry into entrepreneurship, affecting their confidence, risk-taking propensity, and access to resources. Moreover, cultural values such as collectivism or individualism impact networking patterns, collaboration tendencies, and leadership styles among women entrepreneurs.

Major Role of Multiscale Entropy Evolution in Complex Systems and Data Science.

Complex systems are prevalent in various disciplines encompassing the natural and social sciences, such as physics, biology, economics, and sociology. Leveraging data science techniques, particularly those rooted in artificial intelligence and machine learning, offers a promising avenue for comprehending the intricacies of complex systems without necessitating detailed knowledge of underlying dynamics. In this paper, we demonstrate that multiscale entropy (MSE) is pivotal in describing the steady state of complex systems. Introducing the multiscale entropy dynamics (MED) methodology, we provide a framework for dissecting system dynamics and uncovering the driving forces behind their evolution. Our investigation reveals that the MED methodology facilitates the expression of complex system dynamics through a Generalized Nonlinear Schrödinger Equation (GNSE) that thus demonstrates its potential applicability across diverse complex systems. By elucidating the entropic underpinnings of complexity, our study paves the way for a deeper understanding of dynamic phenomena. It offers insights into the behavior of complex systems across various domains.

SENTENCE AS AN OBJECT OF COMPARATIVE LINGUISTICS

The article shows that the sentence is recognized as a fundamental unit of language in comparative linguistics. This structural-syntactic phenomenon exists in a static state in the language system. It is pointed out that an utterance, being a dynamic phenomenon realized in speech, is not a subject of study in comparative linguistics. The sentence, and with it the language's syntax, is recognized as the indispensable linguistic structure with which the comparative study of two or more unrelated languages should begin. The position that the sentence, modality, and proposition constitute the main element of natural language is taken into account. It is concluded that the sentence unit is regarded as the most significant object for comparative linguistics since it is a necessary component of a language system.

An Immersion Ultrasonic Testing‐Based Research Platform for Studying Electroplating Kinetics

AbstractElectroplating is widely exploited in numerous application areas. Understanding the kinetics of electroplating, which is essentially a dynamic phenomenon, is crucial to making use of it appropriately in the real world. Currently, there exist a variety of research tools for studying electroplating kinetics, each with its own pros and cons. In this paper, we introduce a novel, immersion ultrasonic testing‐based technique that carries out in situ, direct monitoring of the thickness increase of an electroplated layer. Through careful design and optimization of the measurement setup and the signal processing protocol, the measurement resolution of the technique was able to reach a sub‐micron level. Via a number of demonstrative zinc plating experiments that were performed under different conditions, the measurement accuracy of the technique was thoroughly validated by a number of independent methods. All in all, the technique can become a promising alternative tool for studying the kinetics of different electroplating processes, supplementing the existing toolbox with the capability of providing a new class of information.

Role of squeezing phenomenon in the reactive dynamics of Jeffrey fluid

AbstractThis study sheds light on the complex dynamics of squeezing flow in Jeffrey fluids and highlights the significance of considering Cattaneo‐Christov heat flux and reactive Species. To simplify the mathematical formulation and facilitate numerical analysis, a similarity transformation is utilized to transform the governing partial differential equations into a collection of interconnected ordinary differential equations (ODEs). The transformed ODEs are subsequently resolved utilizing bvp4c technique. The application of the bvp4c technique enables accurate numerical analysis, offering valuable insights into the behavior of viscoelastic fluids under squeezing conditions with thermal effects and chemical reactions. Through numerical simulations, the temperature distribution, flow characteristics, and reaction kinetics within the Jeffrey fluid under squeezing conditions are examined.

Collision dynamics between soliton molecules and a single soliton: exploding soliton pair and periodic soliton explosions.

Inherent periodic collisions in dual-wavelength mode-locked fiber lasers (MLFLs) stimulate various intra-cavity collision dynamic phenomena. Analogous to the collision of matter particles, collisions between optical soliton molecules (SMs) and single solitons (SSs) have been observed by the real-time spectral measurements. It is demonstrated that the energy accumulation after the collision caused by internal motion within bound pulses leads to soliton pair (SP) explosions, while the periodic soliton explosions with another cavity parameter setting are almost unaffected by the collision. Additionally, the collision between a SP and a SS is reproduced through numerical simulations, and the collision-induced double Hopf-type bifurcation of SP is predicted. These findings provide novel insights, to the best of our knowledge, for further understanding the complex collision dynamics in dual-wavelength MLFLs and will help in the design of high-performance dual-comb sources.

Coherent diffractive imaging with twisted X-rays: Principles, applications, and outlook

Recent technological breakthroughs in synchrotron and x-ray free electron laser facilities have revolutionized nanoscale structural and dynamic analyses in condensed matter systems. This review provides a comprehensive overview of the advancements in coherent scattering and diffractive imaging techniques, which are now at the forefront of exploring materials science complexities. These techniques, notably Bragg coherent diffractive imaging and x-ray photon correlation spectroscopy, x-ray magnetic dichroism, and x-ray correlation analysis leverage beam coherence to achieve volumetric three-dimensional imaging at unprecedented sub-nanometer resolutions and explore dynamic phenomena within sub-millisecond timeframes. Such capabilities are critical in understanding and developing advanced materials and technologies. Simultaneously, the emergence of chiral crystals—characterized by their unique absence of standard inversion, mirror, or other roto-inversion symmetries—presents both challenges and opportunities. These materials exhibit distinctive interactions with light, leading to phenomena such as molecular optical activity, chiral photonic waveguides, and valley-specific light emissions, which are pivotal in the burgeoning fields of photonic and spintronic devices. This review elucidates how novel x-ray probes can be leveraged to unravel these properties and their implications for future technological applications. A significant focus of this review is the exploration of new avenues in research, particularly the shift from conventional methods to more innovative approaches in studying these chiral materials. Inspired by structured optical beams, the potential of coherent scattering techniques utilizing twisted x-ray beams is examined. This promising direction not only offers higher spatial resolution but also opens the door to previously unattainable insights in materials science. By contextualizing these advancements within the broader scientific landscape and highlighting their practical applications, this review aims to chart a course for future research in this rapidly evolving field.

Coarse graining and criticality in the human connectome.

In the face of the stupefying complexity of the human brain, network analysis is a most useful tool that allows one to greatly simplify the problem, typically by approximating the billions of neurons making up the brain by means of a coarse-grained picture with a practicable number of nodes. But even such relatively small and coarse networks, such as the human connectome with its 100-1000 nodes, may present challenges for some computationally demanding analyses that are incapable of handling networks with more than a handful of nodes. With such applications in mind, we set out to study the extent to which dynamical behavior and critical phenomena in the brain may be preserved following a severe coarse-graining procedure. Thus we proceeded to further coarse grain the human connectome by taking a modularity-based approach, the goal being to produce a network of a relatively small number of modules. After finding that the qualitative dynamical behavior of the coarse-grained networks reflected that of the original networks, albeit to a less pronounced extent, we then formulated a hypothesis based on the coarse-grained networks in the context of criticality in the Wilson-Cowan and Ising models, and we verified the hypothesis, which connected a transition value of the former with the critical temperature of the latter, using the original networks. This preservation of dynamical and critical behavior following a severe coarse-graining procedure, in principle, allows for the drawing of similar qualitative conclusions by analyzing much smaller networks, which opens the door for studying the human connectome in contexts typically regarded as computationally intractable, such as Integrated Information Theory and quantum models of the human brain.

Characterizing the "HIV Care Adherence Journey" for Persons With HIV in the Philippines: Conceptual Foundation for Person-Centered Intervention.

Promoting adherence to HIV care among persons with HIV (PWH) is a key component to addressing the rising HIV epidemic in the Philippines. HIV care adherence is a complex process that may change throughout an individual's life course or "journey" living with HIV. This qualitative study aimed to explore the HIV care adherence journey of PWH. Maximum variation sampling was used to select 12 PWH and 3 health care providers for in-depth online interviews, which were analyzed using thematic analysis. The four themes that emerged to describe the HIV care adherence journey are integration, relation, navigation, and manifestation. Each theme corresponds to a unique set of activities and goals related to PWH's lived experiences as they initiate, practice, and maintain care adherence. This study provides a preliminary framework to characterize the HIV care adherence journey as a dynamic, complex, and multifaceted phenomenon, which can help to inform holistic interventions to support PWH.

Solitons, nonlinear wave transitions and characteristics of quasi-periodic waves for a (3+1)-dimensional generalized Calogero–Bogoyavlenskii–Schiff equation in fluid mechanics and plasma physics

A (3+1)-dimensional generalized Calogero–Bogoyavlenskii–Schiff equation describing many nonlinear phenomena in fluid dynamics and plasma physics is considered. The N-solitons and breathers are obtained by basing on its Hirota’s bilinear form and taking the complex conjugate condition on parameters of N-solitons. What is more, breathers can be transformed into a series of nonlinear localized waves by the mechanism of breather transformation. Then through the multi-dimensional Riemann-theta function and the bilinear method, the high-dimensional complex three-periodic wave solutions are constructed systematically, which are the generalization of one-periodic wave and two-periodic wave solutions. By a limiting procedure, the asymptotic relations between the quasi-periodic waves and solitons are strictly established. Additionally, a novel analytical method of characteristic line is introduced to analyze statistically the dynamical characteristics of the quasi-periodic waves. The analytical method employed in this paper can be further extended to investigate the other complex high-dimensional nonlinear integrable equations.

Error-Resilience Phase Transitions in Encoding-Decoding Quantum Circuits.

Understanding how errors deteriorate the information encoded in a many-body quantum system is a fundamental problem with practical implications for quantum technologies. Here, we investigate a class of encoding-decoding random circuits subject to local coherent and incoherent errors. We analytically demonstrate the existence of a phase transition from an error-protecting phase to an error-vulnerable phase occurring when the error strength is increased. This transition is accompanied by Rényi entropy transitions and by onset of multifractal features in the system. Our results provide a new perspective on storing and processing quantum information, while the introduced framework enables an analytic understanding of a dynamical critical phenomenon in a many-body system.

The Baade-Wesselink projection factor of RR Lyrae stars

Context. The application of the parallax-of-pulsation (PoP) technique to determine the distances of pulsating stars implies the use of a scaling parameter, namely the projection factor (p-factor), which is required to transform disc-integrated radial velocities (RVs) into photospheric expansion velocities. The value of this parameter is poorly known and is still debated. Most present applications of the PoP technique assume a constant p-factor. However, it may actually depend on the physical parameters of each star, as past studies designed to calibrate the p-factor (predominantly for Cepheids) led to a broad range of individual values. Aims. We aim to calibrate the p-factors of a sample of RR Lyrae stars (RRLs) in order to compare them with classical Cepheids (CCs). Due to their higher surface gravity, RRLs have more compact atmospheres, and therefore provide a valuable comparison with their supergiant siblings. Methods. We determined the p-factor of 17 RRLs by modelling their pulsation using the SPIPS code. The models are constrained using Gaia DR3 parallaxes, photometry, and new RVs that we collected with the OHP/SOPHIE spectrograph. We carefully examine the different steps of the PoP technique, in particular the method used to determine the RV from spectra using the classical approach based on the cross-correlation function (CCF). Results. The method employed to extract the RV from the CCF has a strong impact on the p-factor, that is, of up to 10%. However, this choice of method results in a global scaling of the p-factor, and only marginally affects the scatter of p within the sample for a given method. Over our RRL sample, we find a mean value of p = 1.248 ± 0.022 for RVs derived using a Gaussian fit of the CCF. There is no evidence for a different value of the p-factor of RRLs, although its distribution for RRLs appears significantly less scattered (σ ≈ 7%) than that for CCs (σ ≈ 12%). Conclusions. The p-factor does not appear to depend in a simple way on fundamental stellar parameters (pulsation period, radius, metallicity, amplitude of the RV curve). We argue that large-amplitude dynamical phenomena occurring in the atmospheres of RRLs (and CCs) during their pulsation affect the relative velocity of the spectral line-forming regions compared to the velocity of the photosphere.

4D Imaging of Two‐Phase Flow in Porous Media Using Laboratory‐Based Micro‐Computed Tomography

AbstractDynamic three‐dimensional computed tomography (CT) imaging of liquid transport in porous media has primarily been conducted at high brilliance synchrotrons thus allowing fast, sometimes sub‐second, temporal resolution to be obtained. University laboratory CT instruments lack the photon flux available at synchrotrons, limiting the obtainable spatiotemporal resolution. Here, we discuss our experiences with instrumentation and software methods to conduct time‐resolved micro‐computed tomography (4D‐CT) experiments of flow in porous media, based on a conventional CT instrument operated with a highly undersampled number of projections. An experimental stage outfitted with syringe pumps placed on a slip ring allowed two‐phase flow experiments to be carried out with continuous unidirectional rotation and without obstruction of the liquid supply lines. An iterative reconstruction algorithm based on a priori information was used to provide high image quality and ∼30 s time resolution despite the few and low‐exposed projections compared to standard protocols. The experimental technique was demonstrated with imbibition and drainage in glass bead‐pack and Bentheimer sandstone samples with sub‐minute temporal resolution, allowing the liquid configurations just before and after fast dynamic phenomena such as cooperative pore‐filling events and Haines jumps to be captured. Power law scaling exponents for burst volumes associated with imbibition and drainage were estimated and compared with the literature. That 4D‐CT experiments can be carried out using conventional CT instruments to challenge contemporary permeability models is of high importance for many geo‐, bio‐ and environmental physics challenges.

ИЗУЧЕНИЕ ВОПРОСОВ, СВЯЗАННЫХ С ФИТОРАЗНООБРАЗИЕМ И ЛЕКАР-СТВЕННЫМ РАСТЕНИЕВОДСТВОДСТВОМ НА ТЕРРИТОРИИ РЕСПУБЛИКИ ТАТАРСТАН.. 90

Any plant phylogenesis is a long-term historical complex of plant species, including elements of different ages, different origins and differing from other floristic complexes in its systematic composition. This complex is a dynamic and unstable phenomenon that changes over time. Its individual elements disperse, or, conversely, remain within the boundaries of their range, de-pending on changes in external ecological and geographical factors. Therefore, when study-ing any floristic composition, it is necessary, first of all, to systematize the plant world. The distribution of species between systematic categories of the highest rank characteristic of each flora. Issues related to the characteristics of the growth, procurement and protection of plant medicinal raw materials are one of the leading links in ongoing activities for the ration-al use of natural resources throughout the world. Medicinal pharmacopoeia plants growing in various regions of Russia are a valuable source of biologically active substances used in med-icine and pharmaceuticals. The study of medicinal plants is important for optimizing the drug production process, as well as for the conservation of biodiversity and sustainable use of natural resources. Methods for studying medicinal pharmacopeial plants include a botanical description of plants, analysis of the chemical composition and pharmacological properties of raw materials, the study of factors affecting the quality and quantity of biologically active substances, as well as the development of methods for growing and collecting plants. Much attention is also paid to the issues of sustainable use of medicinal plants and their conservation in natural ecosystems. The study of medicinal pharmacopoeia plants growing in various regions of Russia, including the Republic of Tatarstan, allows us to determine the optimal conditions for their cultivation, evaluate the quality and effectiveness of the raw materials used, and also develop new drugs based on natural components. The more work there is related to the study of the growth of medicinal plants, the more it will contribute to improving medical practice, enriching the range of medicines and providing access to effective and safe medicines.

Investigating the new perspectives of Caudrey–Dodd–Gibbon equation arising in quantum field theory

The main purpose of the paper is obtaining the analytical results for beta fractional Caudrey–Dodd–Gibbon equation which is used to resolve complex problems in fluid dynamics, chemical kinetics, plasma physics, quantum field theory, crystal dislocations, and nonlinear optics by using auxiliary method. Beta derivative is a useful fractional operator due to satisfying basic properties of integer order derivative and also, allows us using chain rule and wave transform to turn nonlinear fractional partial differential equations into integer order ordinary differential equations. By the way many analytical methods can be applied to these equations. In order to understand the physical features of the solutions, 3D and 2D graphical illustrations are given. Finally, authors expect that the obtained solutions may give a deep insight for the explanation of physical phenomena in the fluid dynamics, chemical kinetics, plasma physics, quantum field theory, crystal dislocations, and nonlinear optics.

Inquiry-Based Chemistry Education Activities in a Non-formal Educational Setting for Gifted Students

Student giftedness is a complex, developmentally dynamic and contextual phenomenon that teachers confront every day. In the classroom, teachers often meet students who have exceptional potential or achieve very high learning goals. The aim of this study is to illustrate the evaluation of inquiry-based learning activities in a specific context (Diversity in Science towards Social Inclusion learning modules) implemented in a non-formal educational setting for gifted students in relation to their level of individual interest and their autonomous and controlled motivation, comparing different groups of students. We investigate how these activities affect the students’ attitudes towards inquiry-based learning, their situational interest and their interest in science careers. A total of 264 Slovenian lower secondary school students participated in the study. The students participated in non-adapted and adapted activities based on the inquiry-based learning approach. The data were collected using pre- and post-activity questionnaires. Participation in the study, which took place in the period between the 2021/22 and the 2022/23 school years, was voluntary. The data was collected anonymously and used for research purposes only. The results show several statistically significant differences in how students’ level of individual interest, autonomous motivation and controlled motivation for learning chemistry affects their attitudes towards inquiry-based learning, their situational interest in Diversity in Science towards Social Inclusion activities and their interest in science careers. For the gifted and non-gifted students who participated in “Forensics Science” lab activities before and after the adaptations to the modules, the results related to their attitudes towards inquiry-based learning and situational interest are also reported. Thus, the results of the study provide useful insights for researchers in the field of chemistry education as well as for chemistry teachers in lower and upper secondary schools. The presented study is a good example of best practices that chemistry teachers can apply in teaching chemistry, thus enabling all students, not only the gifted ones, to learn chemistry using the inquiry-based learning approach.