Resonance Theory Research Articles

"Electron trap" modified type-I heterojunction CdS/CoSe/graphdiyne photocatalyst synergistically promotes photocatalytic hydrogen production

Modifying the carrier dynamics in heterojunction photocatalysts is a direct and effective strategy to enhance photocatalytic hydrogen production. Herein, graphdiyne (GDY) is loaded onto CdS/CoSe using a solvothermal method, and the CdS and GDY form a type-I heterojunction. In addition, the highly conductive metal-like material CoSe acts as an "electron trap" to transfer electrons from GDY to CoSe, which promoting the effective separation of photo-generated electrons and holes, further improving the performance of photocatalytic hydrogen production. The hydrogen evolution rate of CdS/CoSe/GDY (0.17mmol·h-1) is 4.25 and 1.88 times for CdS (0.04mmol·h-1) and CdS/CoSe (0.09mmol·h-1). In-situ X-ray photoelectron spectroscopy (XPS), Electron Paramagnetic Resonance (EPR) and Density functional theory (DFT) calculations and other characterizations demonstrate that the significantly improved photocatalytic performance is not only due to the fast electron transfer and separation by close contact, but also to the synergistic effect between the type-I heterojunction and the "electron trap". In conclusion, this work enriches the study of type-I heterojunction photocatalytic systems and provides new research ideas for the design of efficient photocatalysts.

Youth and Publicness

Aspects of increasing digitalization reinforce tendencies to normalize youth, which is reflected in underestimating and misinterpreting mistrust and stress. Creative means of interacting in public urban situations encourages physical and object-related interventions between people. According to the present hypothesis, experiences in the context of these interventions have the potential to help meet growing individualization requirements. However, these requirements are increasingly underestimated and require appropriate trial treatment spaces. We analyze the possibilities of changing social relations in the public–urban spatial structure with the help of the resonance concept. We understand public–urban spatial structures of temporary appropriation as a relevant phenomenon for the ongoing socio-spatial construction of urban reality. By analyzing the resonance levels of appropriation processes, both the proportional world relations and the respective subjective experience can be described: subjects enter into a resonant relationship with objects that represent the outside world by allowing themselves to be affected and emotionally touched and are open to a reciprocal transformation. This article will examine the extent to which the consideration of the premises derived from resonance theory can lead to changed preconditions and expanded points of reference in the field of urban and spatial planning. In relation to the theme of this Special Issue, we hope to open up a discussion about possible perspectives on inclusive urban spatial practice based on resonance and an expanded definition of sociality.

An Analysis of Indigenisation Dynamics of Kenya Army Band Martial Music

The weakening of British rule and the eventual emancipation of Kenya from colonial control brought the promise of a free nation able to validate its indigeneity through art, culture, and music. However, the Kenyan army band martial music has not fully realised this potential. Sixty years after independence, the Kenya army band plays British-style music and has slowly adapted to indigenous music. This paper is part of a continuing study at Langata Garrison in Nairobi, the home of the Kenya Army Band. The study employed a qualitative approach and a case study research design to analyse selected martial music scores. The guiding theory for this study is Hungry Listening: Resonant Theory, which aims to deconstruct colonisation elements through decolonial listening. The study reveals that while some progress has been made in incorporating Indigenous music, a more deliberate and broad-based approach is needed to cut the umbilical cord of the colonised from the coloniser.

Connecting resonance theory with social‐ecological thinking: Conceptualizing self‐world relationships in the context of sustainability transformations

Connecting resonance theory with social‐ecological thinking: Conceptualizing self‐world relationships in the context of sustainability transformations

Resonance and alienation in dying

ABSTRACT Hartmut Rosa’s theory of resonance and alienation is a sociological theory of modern people’s relationship to the material and social world; the article explores if and how this theory might illuminate contemporary dying. After introducing Rosa’s key concepts of alienation and resonance, the article applies them first to the individual’s dying (my personal death) and second to the possible dying of western modernity, or even humankind itself, due to global warming and ecological degradation (our collective death). Each section looks at how, as the end of individual or collective life approaches, people’s material, social and existential worlds change, and hence how their relationships to the world change. An accustomed world that to some extent may have been resonant becomes alien; yet resonance is sometimes found in the newly alien world of the dying. Finally, resonance is compared and contrasted with some Majority World concepts of living well: Buddhism, ubuntu, and buen vivir; and with psychological concepts commonly applied in the West to both individual mortality and global warming, namely denial, awareness, anxiety and grief.

Chemical Constituents of the Deep-Sea-Derived Penicillium citrinum W22 and Their Ferroptosis Inhibitory Activity.

One new monomeric citrinin analog (1) and 42 known compounds (2-43) were isolated from Penicillium citrinum W22. The structure of 1 was determined by detailed analysis of the 1D and 2D nuclear magnetic resonance (NMR), HRESIMS, and time-dependent density functional theory (TD-DFT)-based electronic circular dichroism (ECD) calculation. Penicitrinol A (2) and methyl 2-(2-acetyl-3,5-dihydroxy-4,6-dimethylphenyl) acetate (11) significantly inhibited renin-angiotensin system-selective lethal 3 (RSL3)-induced ferroptosis with half maximal effective concentration (EC50) values of 1.6 and 34.0µM, respectively.

Synthesis of Anti-Inflammatory Drugs' Chalcone Derivatives and a Study of Their Conformational Properties Through a Combination of Nuclear Magnetic Resonance Spectroscopy and Molecular Modeling.

In this study, two chalcone analogs were synthesized through in silico and experimental methods, and their potential to inhibit the lipoxygenase enzyme, which plays a role in the inflammation pathway, was assessed. Specifically, this study is a continuation of previous research in which chalcone derivatives were synthesized and characterized. In the current work, we present the re-synthesis of two chalcones, with a focus on their docking studies, NMR analysis, and dynamic simulations. The structure of each chalcone was elucidated through a combination of Nuclear Magnetic Resonance (NMR) and Density Functional Theory (DFT). The substituent effect on the absorption spectrum of the two chalcone derivatives was studied. A "LOX-chalcone" complex, predicted by docking studies, was further examined using molecular dynamics (MD) simulations to evaluate the stability of the complex. After fully characterizing the "LOX-chalcone" complexes in silico, the atomic details of each chalcone's interaction with LOX-1 and 5-LOX were revealed through Saturation Transfer Difference (STD) NMR (Nuclear Magnetic Resonance). Finally, their selectivity profile was investigated against human 15-LOX-1 and general Lipoxidase activity. The in silico methods suggest that chalcones could be promising lead compounds for drug designs targeting the LOX enzyme.

Theory of stochastic resonance with state-dependent diffusion

Theory of stochastic resonance with state-dependent diffusion

AuIII Acyclic (Amino)(N-Pyridinium)carbenoids: Synthesis via Addition of 2-PySeCl to AuI-Bound Isonitriles, Structures, and Cytotoxicity.

In this study, we report the first example of acyclic (amino)(N-pyridinium)carbenoid gold(III) complexes synthesized via a coupling reaction between 2-pyridylselenyl chloride and Au(I)-bound isonitriles. The reaction involves an initial oxidative addition of the Se-Cl moiety to Au(I), followed by the nucleophilic addition of the pyridine fragment to the isonitrile's C≡N bond, furnishing a metallacycle. Importantly, this is the first example of the pyridine acting as a nucleophile towards metal-bound isonitriles. Arguably, such an addition is due to the chelate effect. The structures of the gold(III) carbenoid complexes were unambiguously established using X-ray diffraction and NMR spectroscopy. Theoretical calculations, including DFT, Natural Resonance Theory (NRT), and Meyer bond order (MBO) analyses, were used to analyze the different resonance forms. The reaction mechanism was further elucidated using DFT calculations, which identified the oxidative addition as the rate-determining step with a barrier of 29.7 kcal/mol. The nucleophilic addition proceeds with a minimal barrier, making the reaction highly favorable. The antiproliferative activity of new compounds 2a-2e was tested against two human cancer cell lines: A2780 ovarian adenocarcinoma and the A278Cis cisplatin-resistant variant.

SYNTHESIS AND CHARACTERIZATION OF SUBSTITUTED GROUP CONTROLLED PYRENE DERIVATIVES WITH RADICAL CATIONS

Two novel alkyl thiophene-modified pyrene derivatives (1)-(2) were created and synthesized using palladium-catalyzed Stille coupling processes and Friedel-Crafts reaction of pyrene. The polycyclic aromatic groups of the thiophene-modified pyrene were oxidized with Ag[Al(OC(CF3)3)4] to provide the insensitive radical cations 1•+-2•+ based on the alkyl thiophene-modified pyrene derivatives. Nuclear magnetic resonance (NMR), electron paramagnetic resonance (EPR), UV-Vis spectroscopy, and density functional theory (DFT) calculations, were used to investigate their structures and properties. The pyrene moieties were the primary location of the electron spin distribution, with a little overflow onto the outer thiophene moieties. Due to the different substituent groups, free radicals 1•+-2•+ exhibit some different properties. Compound 1•+ is the most extensive thiophene-modified pyrene radical cation that has been reported. These species are anticipated to have wide-ranging potential in the areas of optoelectronic materials and semiconductors.

Compound ultrasonic vibration systems with a complex disk tool: Local resonance characteristics, FEM-based modal analysis, and design method

Good machining performance and high surface quality can be achieved in engineering compound materials when subjected to ultrasonic vibration machining systems. This study established an ultrasonic vibration system with a complex disk tool. The finite element simulation model of the complex disk tool was created using ANSYS software. Modal analysis was utilized to obtain the disk’s resonance frequency and other parameters. Based on the local resonance characteristics of the system and the simulation results, the horn, transducers, and other components were designed. The node position of the compound ultrasound system can be accurately determined, leading to the acquisition of a cutting disc with a disc-shaped cutting edge that exhibits equal center distance and amplitude longitudinal vibration in the ultrasonic vibration system. This vibration system conforms to the local resonance theory of slender rods. A theoretical method for calculating the nodes of the ultrasonic vibration system with a discoid non-resonant frequency was developed. A slight deviation between the measured resonance frequency of the system and the theoretical results was observed. Thus, a reliable design method for ultrasonic vibration cutting systems with complex disk tools has been provided.

Critical theory and human nature: Hartmut Rosa’s resonance theory from an evolutionary-anthropological perspective

In one of the major contributions to current Critical Theory in the 21st century, Hartmut Rosa employs the notion of resonant subject-world-relationships to critically analyse structural features of modern societies that systematically undermine stable conditions for such relationships to unfold. The specific critical potential of resonance theory is based on its status as an account of the good life, which has to build on an account of human nature. Arguably, the best available account of human nature is given by evolutionary anthropology and psychology – pro- ceeding from a wide notion of evolution as natural and cultural. I propose to complement resonance theory with evolutionary approaches to the question of the good life. Resonance theory can offer crucial refinements of the concept of the good life as pre- supposed by authors working within an evolutionary perspective, while in turn being able to profit from the empirical insights of evolutionary anthropology and psychology.

Innovative Progress of LSPR-Based Dark-Field Scattering Spectral Imaging in the Biomedical Assay at the Single-Particle Level.

The growing demand for detection and sensing in the biomedical field is placing higher demands on technology. In clinical testing, it is expected to be able to realize both rapid large-field imaging and analysis of single particles (or single molecules or single cells), and it is expected to be able to grasp both the unique individuality of single particles in time and space during the complex reaction process, as well as the regular correlation between single particles in the same population distribution. Supported and promoted by the theory of localized surface plasmon resonance (LSPR), dark-field microscopy, as a single-particle optical imaging technique with a very high signal-to-noise ratio, provides a powerful new means to address the above clinical detection needs. This review will focus on the innovative applications of dark-field microscopy in biomedical-related assays in the past five years, introducing the basic principles and listing the impressing works. We also summarize how dark-field microscopy has been combined with other techniques, including surface-enhanced Raman scattering, fluorescence, colorimetry, electrochemistry, etc., to witness the joint progress and promotion of detection methods in the future. It also provides an outlook on the current challenges and future trends in this field.

Optimization of image compression using artificial neural networks

The object of research is artificial neural networks of adaptive resonance theory (ART). ART neural networks are classified by matching input data to one of the existing classes, provided that the data is sufficiently similar to the Class prototypes. Continuous and discrete adaptive resonance theory networks ART-1 and ART-2 work effectively in recognition systems, especially in conditions of high uncertainty, when it is necessary to identify a large number of different images. The main problem that was solved in this study was to optimize the process of image compression using artificial neural networks, because image compression is widely used in many scientific and technical fields and becomes especially relevant when transmitting over narrow-band communication channels. A way to overcome these difficulties may be to select basic data for reconstruction from an open data set (Modified National Institute of Standards and Technology) – Fashion-MNIST. There are still unresolved issues related to the fact that lossy compression algorithms with increasing compression ratio usually generate artifacts that are clearly visible to the human eye. A compression algorithm based on neural networks is described, which establishes a correspondence between the input and output spaces consisting of elements of the codebook and neurons. The proposed method uses a different approach (First Order), rather than a simple difference coding scheme (zero order), where the new code is calculated by subtracting the previous encoded block. The peak signal-to-noise ratio of PSNR and the root-mean-square error (MSE) of these algorithms is 24.7 DB with a compression ratio of 25.22. The main area of practical use of the results obtained is improved image compression for processing large – volume video and photo materials without significant loss of quality

Resonance and reflexivity as pathways to eudaimonia in the Anthropocene?

The Anthropocene challenges our ways of relating to the world and our ideas of how to lead a good and ethical life under the threat of climate catastrophe. In this article, two theoretical propositions around how we relate to the world are explored in search for synergies to help outline pathways to a good life: Hartmut Rosa's resonance theory and Margaret S. Archer's reflexivity theory. Both focus on our encounters with the world and suggest ways in which we may formulate private and political concerns and strategies to guide the search for a good life and a good society. Resonance and reflexivity both demand a fundamental openness to the world and suggest how to formulate life strategies that does not ignore the knowledge of climate change but foster and use capacities to engage in collective action towards social change. By integrating resonance and meta-reflexivity, we can form a theoretical basis for an integrated approach to promote such collective action on macro, meso and micro levels.

Wave Resonance Induced Intensification of Mixed Rossby‐Gravity Waves by Extratropical Forcing

AbstractExtratropical disturbances are known to impact the genesis and intensification of Mixed Rossby‐Gravity waves (MRGW) in the Western Hemisphere (WH). The study provides observational evidence supporting the wave resonance (WR) theory which attempts to explain the intensification of MRGW by extratropical forcing. Wavenumber‐frequency cospectral analysis and a bulk measure of growth of MRGW estimated using reanalysis data reveal that the extratropical forcing manifested in the form of eddy momentum flux convergence can create eddy kinetic energy (EKE) and aid the intensification of MRGW via WR mechanism during boreal winter season. However, the WR mechanism does not hold during boreal summer season as the extratropical forcing tends to dampen the MRGW. The analysis also reveals that the Doppler‐shifted eastward propagating MRGW in the WH during boreal winter season are not maintained by extratropical forcing, marking another highlight of this study.

Photoelectron Imaging Spectroscopic and Geometric Configuration and Chemical Bond Analysis of Rh(CN)n-1/0 (n = 1-3) Clusters.

We obtained the photoelectron spectra of Rh(CN)- using the negative ion photoelectron velocity-map imaging (NI-PEVMI) technique and revealed the photodesorption process of Rh(CN)-. The vertical detachment energy (VDE) and adiabatic detachment energy (ADE) of Rh(CN)- have both been experimentally reported to be 2.04 (3) eV. The Franck-Condon (FC) simulation of the ground state of Rh(CN)- was conducted to facilitate a more accurate identification of the experimental photoelectron spectra. The existence of isomer Rh(NC)- was confirmed by the FC simulation result. The vibration frequencies of Rh(CN) and Rh(NC) measured by photoelectron spectroscopy are 462 (50) cm-1 and 471 (50) cm-1, respectively. Based on density functional theory, the stable geometries of Rh(CN)n-1/0 (n = 1-3) clusters were obtained, the values of VDEs and ADEs were calculated, and the photoelectron spectroscopy (PES) was simulated. These can provide theoretical guidance for the experimental study of rhodium cyanide complexes in the future. Finally, we also conduct molecular orbital analysis, natural population analysis, natural resonance theory, and electron localization function analysis to further reveal the nature of the interaction between transition metal Rh and (CN)n ligand. Through the study of Rh(CN)n-1/0 (n = 1-3) complexes, it is found that the transition metal rhodium (Rh) is more inclined to cyanide arrangement.

Unveiling Active Al3+ Sites for Ethanol Dehydration on γ-Al2O3 with Solid-State Nuclear Magnetic Resonance Spectroscopy.

γ-Al2O3 is a crucial catalyst widely used in industrial alcohol dehydration processes. However, the specific nature of its active sites has remained unclear. In this study, we utilize two-dimensional heteronuclear correlation solid-state nuclear magnetic resonance and density functional theory calculations to uncover the active Al sites on the surface of γ-Al2O3 that facilitate ethanol dehydration. We show the formation of stable pentacoordinated AlV-ethanol complexes upon the adsorption of ethanol on the tetracoordinated AlIV sites. This interaction significantly enhances synergy with adjacent AlV-OH sites, resulting in a marked reduction of the activation energy barrier for ethene production. Furthermore, we reveal an interchange between AlIV and AlV-OH species, allowing hexacoordinated AlVI-OH sites to participate in the dehydration pathway through the migration of ethanol between these coordination sites.

Cosmological recession of the Galilean moons from Jupiter

It is suggested that local cosmological expansion occurs in the Jupiter satellite system. First, the relative mean motion accelerations of Io, Europa, and Ganymede are close to the current value of the Hubble‐Lemaître parameter. Second, the rate of orbital expansion of these moons, as determined by tidal resonance theory, is similar to the expansion rate of the Universe. These findings are in conflict with the widely held view that cosmological expansion does not operate at the local level.

Agency.

Agency is action aimed at goals selected by an agent. A deterministic world view leaves scant room for agency. To reconcile the arguments, we represent action as nested control systems, ranging from clearly deterministic to clearly volitional. Negative feedback minimizes deviations from setpoints (goals). Goals are determined by higher modules in a hierarchy of systems, ranging from gamma-efferent spindles through reflexes to operant responses; these last, and the larger system that contains them, called the Self, comprise volitional agents. When operants become habitual they descend to closed teleonomic systems-automaticity. Change in emotional states, and unpredicted changes in the context-raise them back to full volitional systems. At the highest level is the Self-the brain's model of the agent. When aroused out of open teleonomic functioning, it must reconsider means and ends. It does so by simulating action plans, using the same neural systems it uses to effect them. The simulated stimuli and responses are conscious, approximating their perceptions as experienced in real time; this verisimilitude gives them their hedonic value. Positive feedback plays a key role in these complex adaptive systems, as it focuses and holds attention on the most salient percepts and goals, permitting the self-organization of action plans. The Self is not a separate entity, but a colloquy of command modules wearing the avatar of the agent. This system is put into correspondence with Grossberg's Adaptive Resonance Theory. Free will and determinism emerge not as binary opposites, but the modulating inputs to a spectrum of systems.