Resonance Theory Research Articles

Revisiting Hungry Listening

This coauthored essay is an invited response to Dylan Robinson’s 2021 book Hungry Listening: Resonant Theory for Indigenous Sound Studies. The invitation built on his original act of holding space for settler engagement in the conclusion of the book, for which he had asked Waterman and Wong to contribute a dialogue. The authors reflect on prompts provided by Robinson and engage in an iterative, dialogical reflection on how Hungry Listening changed their approaches to decolonial practice, positionality, and being-in-relation through sound. Cvetkovich addresses the book’s impact on her approach to affect, sensory experience, Canadian vs. US vs. Indigenous approaches to affect, and the importance of listening in feminist and queer cultures. She also reflects on how Hungry Listening changed her understanding of the Vancouver and the Fraser River Valley areas. Waterman writes about how the book sharpened her commitment to listening and writing as method and cultural poesis, explored through her ongoing multisensory practice-based research with d/Deaf musicians. She considers her attempts at “attunement,” an embodied critical listening that un/decenters the settler self, and its implications for sound studies and listening studies. Wong reflects on Robinson’s challenge to liberal humanism and its implications for US-based ethnomusicology. She offers a granular example of DJing the crossfade during live radio broadcasts as a place to attempt reciprocal rather than hungry listening. All three authors reflect on the new models for listening demanded by the book and recommit to continued effort to listen differently. Each offers examples of their positioned listening practices and considers how those practices are more akin to visiting since reading Hungry Listening.

Two Different Clar's Sextets: Clar's Rule Does Not Necessarily Contradict the Global Pathway of Conjugated Macrocycles.

Two contradictory theories, Clar's sextet and resonance theory, explain the stability of conjugated macrocycles using localized and delocalized models, respectively. To reconcile these theories and gain better insights, PAH-containing porphyrinoids were chosen as a representative class of conjugated macrocycles. Two types of Clar's sextets were identified and proposed for the first time based on their interaction with global conjugated pathways: (i) shared sextets that integrate with and perturb the global resonance pathway, and (ii) independent sextets that are separate from the pathway and potentially stabilize or do not perturb it. To test our hypothesis, we synthesized precise regioisomers with and without an independent sextet to exclude variables such as steric hindrance, different PAH characteristics, and other elements. This task is challenging due to the extensive synthetic efforts needed for regioisomeric PAH-containing porphyrinoids. We focused on 2,3-vinylnaphthiporphyrin, which features shared sextets, because its o-regioisomers are readily accessible. Two distinct regioisomers (1,2-vinylnaphthiporphyrins) with an independent sextet were synthesized along with unexpected nonaromatic N-fused porphyrinoids. Our analysis shows that 1,2-vinylnaphthiporphyrins with an independent sextet are more aromatic than 2,3-vinylnaphthiporphyrin (nonaromatic). This sextet analysis was also applied to other reported and yet-to-be-synthesized PAH-containing porphyrinoids, and these results are consistent with our current study.

Investigation of ferromagnetic resonance heating of isotropic superparamagnetic on the example of biogenic ferrihydrite nanoparticles

Ferrihydrite nanoparticles have been synthesized and characterized. The dependences of the temperature increment of powders in the pumping mode by a high-frequency electromagnetic field in a constant magnetic field are studied. It is shown that the experimental dependence of the particle temperature on the dc magnetic field strength is in good agreement with the theory of ferromagnetic resonance for an isotropic superparamagnetic.

The turbulent cascade of inertia-gravity waves in rotating shallow water

In this work we study features of inertia-gravity wave turbulence in the rotating shallow water equations. On examining the dynamics of waves with varying rotation rates, we find that the turbulent cascade of waves is strongest at low rotation rates, forming a $k^{-2}$ energy spectrum, and a rich distribution of shocks in physical space. At high rotation rates, the forward cascade of waves weakens along with a steeper energy spectra and vanishing of shocks in physical space. The wave cascade is seen to be scale-local, resulting in a noticeable time interval for energy to get transferred from domain scale to dissipative scale. Furthermore, we find that the vortical flow has a non-negligible effect on the wave cascade, especially at high rotation rates. The vortical flow assists in the forward cascade of waves and shock formation at high rotation rates, while the waves by themselves in the absence of the vortical flow lack a forward cascade and shock formation at such high rotation rates. On investigating the physical space structures in the vortical flow and their connections to the wave cascade, we find that strain-dominant regions, that are located around the boundaries of coherent vortices, are the physical space regions that contribute majorly to the forward cascade of waves. Our results in general highlight intriguing features of dispersive inertia-gravity wave turbulence that are qualitatively similar to those seen in three-dimensional homogeneous isotropic turbulence and are beyond the predictions of asymptotic resonant wave interaction theory.

The Trifluorooxygenate Anion [OF3]-: Spectroscopic Evidence for a Binary, Hypervalent Oxygen Species.

Experimental evidence for hypervalent compounds of second-row elements is still scarce in literature. Here, we present the first report of the long-sought binary, hypervalent trifluorooxygenate anion [OF3]-. It was isolated in solid Ne matrices under cryogenic conditions after reacting oxygen difluoride with free fluoride ions from laser ablation of alkali metal fluorides MF (M=Li-Cs). VSEPR theory and calculations at the CCSD(T) level predict a C2v-symmetric T-shape structure with one short and two long O-F bond lengths in [OF3]-. This is confirmed experimentally by FTIR spectroscopy in combination with isotopic labeling. Analysis of the natural local molecular orbitals shows the presence of one 2c-2e and one 3c-4e bond each. Natural resonance theory indicates the importance of the stability of [OF2]⋅- for the stability of [OF3]-. Although free [OF2]⋅- was not detected, the species MOF2 (M=Na-Cs) could be observed in the same experiments, which are best described as contact ion pairs of M+[OF2]⋅-.

Das Trifluoroxygenat‐Anion [OF3]−: Spektroskopischer Nachweis einer Binären, Hypervalenten Sauerstoffspezies

AbstractExperimentelle Belege für hypervalente Verbindungen von Elementen der zweiten Periode sind in der Literatur selten. In dieser Arbeit berichten wir erstmals über das lange gesuchte binäre, hypervalente Trifluoroxygenat‐Anion [OF3]−. Es wurde gebildet durch die Reaktion von Sauerstoffdifluorid mit freien Fluorid‐Ionen, welche durch Laserablation von Alkalimetallfluoriden MF (M=Li−Cs) erzeugt wurden, und konnte unter kryogenen Bedingungen in Neonmatrizen isoliert werden. Das VSEPR‐Modell und Berechnungen auf CCSD(T)‐Niveau sagen eine C2v‐symmetrische T‐förmige Struktur mit einer kurzen und zwei langen O−F‐Bindungen für [OF3]− voraus. Dies wird durch FTIR‐Spektroskopie in Kombination mit Isotopenmarkierungs‐Experimente bestätigt. Eine Analyse der natürlichen lokalisierten Molekülorbitale zeigt das Vorliegen einer 2Z–2E‐Bindung und einer 3Z–4E‐Bindung an. Natural Resonance Theory weist auf die Bedeutung der Stabilität von [OF2]⋅− für die Stabilität von [OF3]− hin. Obwohl freies [OF2]⋅− nicht nachgewiesen wurde, konnten in denselben Experimenten die Spezies MOF2 (M=Na−Cs) beobachtet werden, die sich am besten als Kontaktionenpaar M+[OF2]⋅− beschreiben lassen.

Theory of Magnetoacoustic Resonance to Probe Multipole Effects Due to a Crystal Field Quartet

Theory of Magnetoacoustic Resonance to Probe Multipole Effects Due to a Crystal Field Quartet

Nuclear Magnetic Resonance (NMR) and Density Functional Theory (DFT) Study of Water Clusters of Hydrogen-Rich Water (HRW)

The present study investigated the 1H Nuclear Magnetic Resonance (NMR) spectra of hydrogen-rich water (HRW) produced using the EVObooster device. The analyzed HRW has pH = 7.1 ± 0.11, oxidation–reduction potential (ORP) of (−450 ± 11) mV, and a dissolved hydrogen concentration of 1.2 ppm. The control sample was tap water filtered by patented technology. A 600 NMR spectrometer was used to measure NMR spectra. Isotropic 1H nuclear magnetic shielding constants of the most stable clusters (H2O)n with n from 3 to 28 have been calculated by employing the gauge-including-atomic-orbital (GIAO) method at the MPW1PW91/6-311+G(2d,p) density function level of theory (DFT). The HRW chemical shift is downfield (higher chemical shifts) due to increased hydrogen bonding. More extensive formations were formed in HRW than in control filtered tap water. The exchange of protons between water molecules is rapid in HRW, and the 1H NMR spectra are in fast exchange mode. Therefore, we averaged the calculated chemical shifts of the investigated water clusters. As the size of the clusters increases, the number of hydrogen bonds increases, which leads to an increase in the chemical shift. The dependence is an exponential saturation that occurs at about N = 10. The modeled clusters in HRW are structurally stabilized, suggesting well-ordered hydrogen bonds. In the article, different processes are described for the transport of water molecules and clusters. These processes are with aquaporins, fusion pores, gap-junction channels, and WAT FOUR model. The exponential trend of saturation shows the dynamics of water molecules in clusters. In our research, the chemical shift of 4.257 ppm indicates stable water clusters of 4–5 water molecules. The pentagonal rings in dodecahedron cage H3O+(H2O)20 allow for an optimal arrangement of hydrogen bonds that minimizes the potential energy.

QTc interval prolongation impact on in-hospital mortality in acute coronary syndromes patients using artificial intelligence and machine learning

BackgroundPrediction of mortality in hospitalized patients is a crucial and important problem. Several severity scoring systems over the past few decades and machine learning models for mortality prediction have been developed to predict in-hospital mortality. Our aim in this study was to apply machine learning (ML) algorithms using QTc interval to predict in-hospital mortality in ACS patients and compare them to the validated conventional risk scores.ResultsThis study was retrospective, using supervised learning, and data mining. Out of a cohort of 500 patients admitted to a tertiary care hospital from September 2018 to August 2020, who presented with ACS. Prediction models for in-hospital mortality in ACS patients were developed using 3 ML algorithms. We employed the ensemble learning random forest (RF) model, the Naive Bayes (NB) model and the rule-based projective adaptive resonance theory (PART) model. These models were compared to one another and to two conventional validated risk scores; the Global Registry of Acute Coronary Events (GRACE) risk score and Thrombolysis in Myocardial Infarction (TIMI) risk score. Out of the 500 patients included in our study, 164 (32.8%) patients presented with unstable angina, 148 (29.6%) patients with non-ST-elevation myocardial infarction (NSTEMI) and 188 (37.6%) patients were having ST-elevation myocardial infarction (STEMI). 64 (12.8%) patients died in-hospital and the rest survived. Performance of prediction models was measured in an area under the receiver operating characteristic curve (AUC) ranged from 0.83 to 0.93 using all available variables compared to the GRACE score (0.9 SD 0.05) and the TIMI score (0.75 SD 0.02). Using QTc as a stand-alone variable yielded (0.67 SD 0.02) with a cutoff value 450 using Bazett’s formula, whereas using QTc in addition to other variables of personal and clinical data and other ECG variables, the result was 0.8 SD 0.04. Results of RF and NB models were almost the same, but PART model yielded the least results. There was no significant difference of AUC values after replacing the missing values and applying class balancer.ConclusionsThe proposed method can effectively predict patients at high risk of in-hospital mortality early in the setting of ACS using only clinical and ECG data. Prolonged QTc interval can be used as a risk predictor of in-hospital mortality in ACS patients.

Introducing career resonance

In this article I describe Rosa's theory of resonance. I argue that resonance has a relevance in a capitalist society. Following this, I explore both losing and having career resonance and how this impacts well-being and has association with psychological burn-out. Next, I introduce career resonance and suggest how career professionals may help clients to foster resonance through their work. Finally, I emphasise that career resonance has a part to play in addressing psychological burnout and that career professionals may be called to deepen understanding and form collaborations with well-being professionals. In conclusion, I emphasise that human beings are born resonant and that career resonance has a relevance to everyone.

FedART: A neural model integrating federated learning and adaptive resonance theory

Federated Learning (FL) has emerged as a promising paradigm for collaborative model training across distributed clients while preserving data privacy. However, prevailing FL approaches aggregate the clients’ local models into a global model through multi-round iterative parameter averaging. This leads to the undesirable bias of the aggregated model towards certain clients in the presence of heterogeneous data distributions among the clients. Moreover, such approaches are restricted to supervised classification tasks and do not support unsupervised clustering. To address these limitations, we propose a novel one-shot FL approach called Federated Adaptive Resonance Theory (FedART) which leverages self-organizing Adaptive Resonance Theory (ART) models to learn category codes, where each code represents a cluster of similar data samples. In FedART, the clients learn to associate their private data with various local category codes. Under heterogeneity, the local codes across different clients represent heterogeneous data. In turn, a global model takes these local codes as inputs and aggregates them into global category codes, wherein heterogeneous client data is indirectly represented by distinctly encoded global codes, in contrast to the averaging out of parameters in the existing approaches. This enables the learned global model to handle heterogeneous data. In addition, FedART employs a universal learning mechanism to support both federated classification and clustering tasks. Our experiments conducted on various federated classification and clustering tasks show that FedART consistently outperforms state-of-the-art FL methods on data with heterogeneous distribution across clients.

Syntheses, Geometric and Electronic Structures of Inorganic Cumulenes.

Molecular chains of two-coordinate carbon atoms (cumulenes) have long been targeted, due to interest in the electronic structure and applications of extended π-systems, and their relationship to the carbon allotrope, carbyne. While formal (isoelectronic) B═N for C═C substitution has been employed in two-dimensional (2-D) materials, unsaturated one-dimensional all-inorganic "molecular wires" are unknown. Here, we report high-yielding synthetic approaches to heterocumulenes containing a five-atom BNBNB chain, the geometric structure of which can be modified by choice of end group. The diamido-capped system is bent at the 2-/4-positions, and natural resonance theory calculations reveal significant contributions from B═N(:)-B≡N-B resonance forms featuring a lone pair at N (consistent with observed N-centered nucleophilicity). Molecular modification to generate a linear system best described by a B═N═B═N═B resonance structure involves chemical transformation of the capping groups (using B(C5F5)3) to enhance their π-acidity and conjugate the N-lone pairs.

Bandgap characteristics of four component periodic pile barriers in passive vibration isolation

Based on the local resonance theory, the vibration isolation performance of four-component periodic pile barriers consisting of a matrix, an outer pipe, an inner pipe, and a pile core was investigated using the finite element method (FEM). This configuration is contrasted with traditional three-component periodic pile barriers, which are composed of a matrix, a pipe, and a pile core. The four-component systems demonstrate significantly broader bandgaps compared to three-component systems. To validate the efficiency of the FEM, model test on pile barriers were conducted, facilitating a comparison between the FEM and experimental observations of bandgap characteristics. Additionally, the effects of the outer pipe’s density, elastic modulus, and thickness on the complete bandgap characteristics were comprehensively studied within the four-component structure. It is found that the broadest vibration isolation band gaps occur under hexagonal arrangement pattern. In square and hexagonal lattice configurations, the density, elastic modulus, and thickness of the outer pipe pile’s pile have predominantly influenced the upper bound frequency (UBF). There has been a positive correlation between the elastic modulus and the UBF, while the density and thickness have shown inverse relationships. Moreover, there exists a elastic modulus threshold, marking a transition in the displacement mode of the UBF, from the outer irreducible Brillouin zone (M or X) to the inner zone (Γ). Once the threshold is exceeded, both the vibration displacement mode and the width of bandgap remain substantially unchanged. The results obtained in the present paper are very useful for the design and application of periodic pile barriers in ambient vibration reduction.

Experimental study on the location detection method of deionized water freezing front based on microwave resonance theory

Ice accumulation is a natural phenomenon in cold climates, but it causes serious issues to various industries. To accurately detect the thickness of ice on a horizontal cold plate, a capacitance-coupled split-ring resonator is employed. The impact of the average height of static and dynamic freezing front on the resonator at −20 °C was investigated experimentally. The sensor is capable of detecting freezing fronts up to a maximum height of approximately 20 mm. The height of the static freezing front can be sensitively detected within the range of 0–5.4 mm, with an average error of the sensor less than 0.53 mm. Furthermore, the height of the dynamic static can be detected with a higher degree of accuracy within 0–8.4 mm, the average detection error is 0.37 mm. This technology can serve as a point of reference for the field of anti-icing.

Polar Neptunes Are Stable to Tides

There is an intriguing and growing population of Neptune-sized planets with stellar obliquities near ∼90°. One previously proposed formation pathway is a disk-driven resonance, which can take place at the end stages of planet formation in a system containing an inner Neptune, outer cold Jupiter, and protoplanetary disk. This mechanism occurs within the first ∼10 Myr, but most of the polar Neptunes we see today are ∼Gyr old. Up until now, there has not been an extensive analysis of whether the polar orbits are stable over ∼Gyr timescales. Tidal realignment mechanisms are known to operate in other systems, and if they are active here, this would cause theoretical tension with a primordial misalignment story. In this paper, we explore the effects of tidal evolution on the disk-driven resonance theory. We use both N-body and secular simulations to study tidal effects on both the initial resonant encounter and long-term evolution. We find that the polar orbits are remarkably stable on ∼Gyr timescales. Inclination damping does not occur for the polar cases, although we do identify subpolar cases where it is important. We consider two case study polar Neptunes, WASP-107 b and HAT-P-11 b, and study them in the context of this theory, finding consistency with present-day properties if their tidal quality factors are Q ≳ 104 and Q ≳ 105, respectively.

Evaluation of power system instability probability considering output randomness of grid-connected converter

Abstract In recent years, there has been a notable increase in the installed capacity of new energy sources. Nevertheless, the random nature of the output power of G-CCs may potentially result in power system instability. This paper presents a closed-loop interconnection model comprising a G-CC as a feedback subsystem and a VSC-HVDC system as a feedforward subsystem. The instability condition of the closed-loop system is derived from the open-loop mode resonance theory. Subsequently, a mathematical model is developed to represent the random output of the G-CC. This approach allows the probability of open-loop mode resonant instability of the power system to be evaluated, as well as the risk of sub-synchronous resonant instability caused by the output randomness of the G-CC. Finally, validation is performed by building a simulation example system and a time-domain simulation system in MATLAB.

The Practical Implications Manifested in Dasan and Jeungsan’s Theory of Mutual Resonance

The Practical Implications Manifested in Dasan and Jeungsan’s Theory of Mutual Resonance

Research of Turkish Earthquake Reports Based on Resonance Theory

The purpose of this study is to examine the public's perception of the distant suffering of the alienation phenomenon and its treatment in the era of social media. The study uses resonance theory to investigate that the media affects the public perception of distant suffering and elicits moral reflection and emotional resonance in the context of globalization and technological acceleration. This research explains the fundamental ideas of resonance theory, including how to build the axes of resonance and how to look for harmonious resonance in an accelerating society between people and the community. Through the balancing techniques of social media in catastrophe coverage, the paper investigates the case of the Turkish earthquake to demonstrate the reasons for public perception fatigue and the methods by which individuals can get involved in humanitarian efforts.

Housewife Blogger and The Paradoxical Influence in Gender Roles and Self-Perception

The rise of digital media platforms, notably TikTok, has seen the emergence of housewife bloggers sharing their daily chores. Initially driven by interest, these bloggers have transitioned into a profession marked by standardized content and commercialization. While offering career opportunities, their portrayal of household chores reinforces traditional gender roles. This article discusses the reason why housewife bloggers are popular from the aspects of emotional resonance and social comparison theory, summarizes the common features of these bloggers as “protagonist rather than dominant”, “limited space and repetitive labor” and “performing ‘reality’ ”, and thus explores the paradoxical impact of housewives integrating into society to create value and further imprisoning themselves in this identity or feeling anxious about not being able to create direct value, shedding light on its implications for gender roles and self-perception in the digital age, providing new thinking for the impact of digital media on social life from the perspective of gender division of labor.

Enhanced four-band absorption in a tunable graphene subwavelength grating structure for photodetection

This paper investigates a sub-wavelength multilayer dielectric grating structure based on a simple metasurface, achieving dynamically switchable four-band absorption enhancement. This enhancement spans the visible to near-infrared (NIR) range, with absorption exceeding 90%, representing nearly a 40-fold increase over the intrinsic absorption of a single graphene layer. The contributions of guided-mode resonance (GMR), optical Tamm state (OTS), and photonic crystal defect cavity resonance to the absorption spectra are analyzed separately, offering a method for independent multi-channel signal extraction. Additionally, we explore the impact of structural parameters on the absorption response and examine the broad-spectrum multiband detection mechanism. This mechanism, explained through the integration of resonant cavity perturbation theory and the dynamic tuning of absorption efficiency via graphene's Fermi energy levels, results in an independently tunable optical system for four key operating bands. These properties make the structure suitable for applications such as multiband biomedical photodetectors or components in optoelectronic devices with multiple operating bands.