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Harmonics - Science topic

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Book
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This proceedings volume presents a collection of articles from key practitioners from relevant areas with experience in critical infrastructure. The authors acknowledge that the responsibility for critical infrastructure protection is primarily a matter of international importance, hence a high degree of cross-border and cross-sectoral interdepende...
Article
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Some new classes of general harmonic biconvex directional variational inequalities are introduced and investigated. The study proposes and analyses various inertial iterative strategies for addressing harmonic directed variational inequalities through the auxiliary principle technique. The convergence criteria under specific weak conditions , empha...
Article
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In this paper, we introduce and investigate some new classes of trifunction harmonic variational inequalities. Several important new problems are obtained as special cases. Some new harmonic Bregman distance functions are derived for the Shannan entropy and Burg entropy harmonic convex functions. The auxiliary principle technique involving the harm...
Article
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We investigate the classical aspects of quantum theory and under which description quantum theory does appear classical. Although such descriptions or variables are known as “ontological” or “hidden,” they are not hidden at all but are dual classical states (in the sense of the general classical–quantum duality of nature). We analyze and interpret...
Article
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To enable a sustainable and socially accepted hydrogen and methanol economy, it is crucial to prioritize green and water-conscious production. In this review, we reveal that there is a significant research gap regarding comprehensive assessments of such production methods. We present an innovative process chain, consisting of adsorption-based direc...
Article
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This study compares classical direct torque control (DTC) methods with a proposed quantum direct torque control (QDTC) strategy for synchronous machines. A quantum comparator is developed by implementing a quantum subtractor between real numbers ranging from -100 % to +100 %, and a quantum sign function is developed using this digital quantum subtr...
Article
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The adoption of the Artificial Intelligence Act (AIA) by the European Union represents a critical turning point in the regulation of artificial intelligence (AI) technologies. This ambitious legislative framework positions Europe as a global leader, with the aim of harmonizing practices for the development and use of artificial intelligence to ensu...
Article
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Knowledge of the force time history of a structure is essential to assess its behaviour, ensure safety and maintain reliability. However, direct measurement of external forces is often challenging due to sensor limitations, unknown force characteristics, or inaccessible load points. This paper presents an efficient dynamic load reconstruction metho...
Article
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WorldCereal, a platform developed under the leadership of VITO Remote Sensing and the European Space Agency, provides high-resolution global cropland and crop type maps. This study evaluates the accuracy and reliability of these products using in situ data from FAOSTAT. We harmonized diverse datasets to enable fair assessments and employed robust s...
Preprint
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We study the Galois-module structure of polydifferentials for Mum-ford curves, defined over a field of positive charactersitic, using the theory of harmonic cocycles. For the case of Artin-Schreier-Mumford curves the structure of holomorphic polydifferentials is explicitly computed.
Article
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Introduction Polygenic Scores (PGSs) assess cumulative genetic risk variants that contribute to the association with complex diseases like Alzheimer’s Disease (AD). The PGS Catalog is a valuable repository of PGSs of various complex diseases, but it lacks standardized annotations and harmonization, making the information difficult to integrate for...
Article
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The rapid growth of digital assets, including cryptocurrencies and non-fungible tokens (NFTs), has created significant challenges for value-added tax (VAT) and goods and services tax (GST) frameworks worldwide. The European Court of Justice's landmark ruling in Case C-264/14 (Hedqvist) clarified the VAT treatment of Bitcoin transactions, but it als...
Article
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The rise of digital assets, particularly Bitcoin and non-fungible tokens (NFTs), has presented unprecedented challenges for value-added tax (VAT) systems across the European Union (EU). This study explores the complex legal landscape surrounding the application of VAT to these emerging assets, focusing on the implications of EU jurisprudence. By an...
Article
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Absztrakt-A földtani erőforrások joga és egységesebb szabályozásuk lehetőségei A földtani közeget egyre szélesebb körben hasznosítjuk, de szabályozása nem tart lépést az új technológiák megjelenésével, és egyre gyakoribbak a konfliktusok a hagyományos földtani erőforrások kinyerésével is. A szabályozás tárgyai javarészt a nemzeti vagyon körébe tart...
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We present the GOME-type Ozone Profile Essential Climate Variable (GOP-ECV) data record covering the 26-year period from July 1995 until October 2021. It is derived from a series of five nadir-viewing ultraviolet-visible(-near-infrared) satellite instruments of the GOME-type, including GOME/ERS-2, SCIAMACHY/ENVISAT, OMI/Aura, GOME-2/MetOp-A, and GO...
Article
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Personality tests are used regularly as a requirement within many sectors in Brazil, including education, human resources, and transportation. The Personality Factor Inventory, based on Murray’s system of needs theory, is one of the widely used tools within Brazil. Despite its importance, its results are only partially related to the Big Five theor...
Article
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The rapid growth of digital assets, such as Bitcoin and non-fungible tokens (NFTs), has posed significant challenges to VAT/GST frameworks across the European Union. The landmark ruling in Case C-264/14 (Skatteverket v. David Hedqvist) established that Bitcoin transactions are exempt from VAT as they constitute a means of payment. However, the appl...
Article
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Photodetectors equipped with multi-parameter control hold the potential to deliver exceptional performance in a wide range of scenarios, paving the way for developing novel spin-opto-electronic devices. Nevertheless, the integration of such capabilities within a single device is challenging due to the necessity of harmonizing multiple materials wit...
Article
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The rapid evolution of digital economies, characterized by decentralized technologies like blockchain, cryptocurrencies, and Web3 innovations, has exposed significant limitations in existing value-added tax (VAT) frameworks. The Hedqvist case, which exempted Bitcoin transactions from VAT within the European Union, highlighted the challenges of appl...
Article
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This paper presents an improved intelligent optimizing algorithm based on parameter identification and drift compensation for the rate-integrating resonator gyroscope (RIRG). Besides damping and frequency imperfections, the RIRG measurement accuracy still suffers from limitations due to nonlinear error. Therefore, the dynamic nonlinear error model...
Article
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We investigated the impact on the spin–orbit torque (SOT) efficiency by varying the thickness of the Cr and Tb layers in the Pt/Co/Tb/Cr system. The harmonic Hall voltage measurement shows that the Tb insert layer effectively enhances the damping-like (DL) torque efficiency, which is ascribed to the conversion of the orbital current to spin current...
Book
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The Cape Town Convention and its equipment-specific protocols are of great importance with respect to harmonization discussions. Its aircraft protocol is in force, and the international registry is in use with over a million registrations. Its ratification and effective implementation enable state parties to be included in the Cape Town Discount Li...
Article
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In Brazil, biodiversity offsetting operates in an ad hoc manner while biodiversity equivalence has mainly been overlooked by public policies. Despite being mandatory since 1965s Forest Code (Law 4.771), we fail to have a robust offsetting framework. The revision of the forest code in 2012 (i.e., Native Vegetation Protection Law—NVPL—Law n° 12,651/2...
Article
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The article examines the legal liability (administrative and civil) regimes introduced to establish an accountability model for credit rating agencies (CRA). In particular, the article focuses on the limits that hinder the achievement of a comprehensive accountability model for CRA, in which the two functions of deterrence-performed by the ESMA's s...
Article
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We explore the dynamics of active elements performing persistent random motion with fluctuating active speed and in the presence of translational noise in a d -dimensional harmonic trap, modeling active speed generation through an Ornstein-Uhlenbeck process. Our approach employs an exact analytic method based on the Fokker-Planck equation to comput...
Article
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We prove a Li-Yau gradient estimate for positive solutions to the heat equation defined on a metric star graph \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mathcal...
Article
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This study aims to analyze the policies of two ministries, namely the Ministry of Religious Affairs (Kemenag) and the Ministry of Education, Culture, Research and Technology (Kemendikbudristek) at the elementary and junior high school levels, in implementing the education curriculum in Indonesia. This study is qualitative with a Systematic Literatu...
Article
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The ASEAN Digital Economy Framework Agreement (DEFA) represents a pivotal initiative in advancing regional digital integration and economic development. This paper explores DEFA's potential impacts on digital trade and regional economic cohesion within ASEAN. By reviewing ASEAN’s official publications and relevant literature, the study evaluates ho...
Article
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Periodic oscillations of shock waves in transonic flow fields create very unstable aerodynamic loads that have a big effect on how safe an aircraft is and how well it handles. To elucidate the mechanism of transonic shock buffeting, a jet disturbance method is introduced and used to analyze the evolution of the flow field characteristics. First, th...
Article
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The fiber-optic sensor array based on path-matched differential interferometry (PMDI)-time division multiplexing (TDM) offers the advantages of minimal channel crosstalk and high sensitivity. The 3 × 3 optical fiber coupler demodulation is the commonly employed scheme for PMDI-TDM. However, due to the non-ideal characteristics of the 3 × 3 optical...
Article
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The rapid evolution of digital assets, from Bitcoin and other cryptocurrencies to non-fungible tokens (NFTs), has posed significant challenges for value-added tax (VAT) and goods and services tax (GST) frameworks across the European Union (EU). The decentralized and borderless nature of these technologies clashes with the fragmented and jurisdictio...
Article
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The use of circularly polarized high-peak-power ultrashort pulses has various applications in extreme field science. Commonly used quarter-wave plates are unsuitable here, while multi-mirror schemes are technically complicated. We have demonstrated that simple PET film, $20.5\,\,\unicode{x00B5}{\rm m}$ thick, can be used to manipulate the polarizat...
Article
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Our ability to accurately predict the delivery date of term pregnancies is limited by shortcomings of modern-day clinical tools and due date estimation methods. The pregnancy clock is a series of coordinated and harmonized signals between mother, fetus, and placenta that regulate the length of gestation. Clock proteins are thought to be important m...
Preprint
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Unidirectional amplification in a nonreciprocally coupled chain of harmonic oscillators serves as a classical analog of the non-Hermitian skin effect (NHSE). We extend this concept to the nonlinear regime using double-well Duffing oscillators arranged in a ring-structured unit. Adding a unit induces bifurcations of attractors, transitioning from li...
Article
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Chirality of exciton-polaritons can be tuned by the chirality of photons, excitons, and their coupling strength. In this work, we propose a general analytical model based on coupled harmonic oscillators to describe the chirality of exciton-polaritons. Our model predicts the degree of circular polarization (DCP) of exciton-polaritons, which is deter...
Article
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Observing multiphoton electron–positron pair production (the nonlinear Breit–Wheeler process) requires high-energy γ rays to interact with strong electromagnetic fields. In order for these observations to be as precise as possible, the γ rays would ideally be both mono-energetic and highly polarized. Here we perform Monte Carlo simulations of an ex...
Article
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Recent advancements in 3D scene representation have underscored the potential of Neural Radiance Fields (NeRFs) for producing high-fidelity renderings of complex scenes. However, NeRFs are hindered by the significant computational burden of volumetric rendering. To address this, 3D Gaussian Splatting (3DGS) has emerged as an efficient alternative,...
Article
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Laboratory and pot trials were conducted to study germination performance of rapeseed (Brassica napus L., genotype Excalibur) under NaCl salinity after seed priming with 20 mM NaCl for 24 h. In the laboratory trial, salinity levels of 80, 160, and 240 mM NaCl reduced the germination percentage by 14, 56, and 80 percentage points, respectively compa...
Preprint
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In this paper, we investigate the concept of a black string in the context of a quantum harmonic oscillator. Black strings, as solutions in higher-dimensional gravity, provide a novel avenue for studying gravity's behaviour in quantum systems. We explore the interactions between the quantum harmonic oscillator and the black string, focusing on the...
Article
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This paper proposes a hybrid multi-vector model predictive control (MPC) to reduce the harmonic content in the output current of a two-level virtual synchronous generator (VSG). Compared to traditional two-vector MPC, the proposed hybrid multi-vector MPC has twelve sets of voltage vectors, meaning that the number of iterative calculations required...
Article
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Harmonized satellite-maritime networks hold the promise of seamlessly filling the maritime coverage-holes, hence they have attracted substantial research interests. In this broad context, we study the scenario of remote geographic locations, where the satellite supports multiple users on the sea. However, given the limited handset-power, the direct...
Article
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Corruption is a major problem that hinders Indonesia's progress, undermines government systems, and deteriorates public services. The Corruption Eradication Commission (KPK) plays an important role in preventing and combating corruption. However, the KPK's success is still hindered by a number of problems, including political resistance, lack of re...
Preprint
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We numerically investigate the behavior of a Josephson traveling wave parametric amplifier assuming a current-phase relation with a second--harmonic contribution. We find that varying the weight of harmonic terms in the Josephson current affects the gain profile. The analysis of gain characteristics, phase-space portraits, Poincar\'e sections, and...
Article
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Harmonic mode-locking, realized actively or passively, is an effective technique for increasing the repetition rate of ultrafast lasers. It is critically important to understand how a harmonically mode-locked pulse train responds to external perturbations and noise, so as to make sure that it is stable and resistant to noise. Here, in a series of c...
Article
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Among six-phase motors, those featuring symmetrical winding arrangements with a single neutral point (S6N1) offer enhanced fault tolerance. However, a single neutral point lowers the dc-link utilization in the linear pulsewidth modulation (PWM) range. Most previous multiphase overmodulation (OVM) methods address this limitation by injecting just no...
Article
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We investigate Gravity Waves (GWs) in the lower atmosphere of Mars based on pressure timeseries acquired by the InSight lander. We compile a climatology showing that most GW activity detected at the InSight landing site takes place after the sunrise and sunset; they are almost absent during the aphelion season, and more prominent around the equinox...
Article
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Digital nomads are knowledge workers who leverage information technology (IT) to perpetually travel while working independently of any organizational membership. Corporate nomads are individuals who adopt a nomadic lifestyle but remain permanent employees, which places them in a field of tension between corporate work and digital nomadism-two conce...
Article
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In order to avoid overheating of a BLDC permanent magnet (PM) motor at high speeds, this paper focuses on the loss reduction of a 90 W 47,000 r/min BLDC hollow-cup motor. It is proposed to provide an optimizing method for the series reactors and the parameterization of reactors in the motor system. The finite element method (FEM) is used to calcula...
Article
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تسعى هذه الدراسة إلى دراسة الاستراتيجيات الإقناعية في خطب أبي عبيدة المتحدث الرسمي لكتائب القسام، للوقوف على مدى تجلي آليات الإستراتيجية التوجيهية في التواصل بين المتلقين مع مختلف ثقافاتهم، وتنوع جغرافيتهم السكانية، ومدى القدرة الخطابية لأبي عبيدة في إقناع متلقيه والتأثير فيه، وقدرة على مواءمة هذه الإستراتيجية مع السياق الذي ترد فيه، اعتمادًا على ا...
Article
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Background: Regional regulations (Perda) in Indonesia often face issues of overlap and inefficiency. Specific Background: The Omnibus Law method, known for simplifying and harmonizing regulations, has been applied nationally but remains underexplored locally. Knowledge Gap: Its practical application at the regional level, including challenges and o...
Article
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Since power systems are designed to work at the fundamental frequency, the presence of other frequencies from various sources may induce series and parallel resonances, leading to damage. The behavior of the power system in the presence of harmonics becomes evident with knowledge of harmonic impedance. Measurement offers the most accurate means of...
Article
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As a promising technology, grid-forming (GFM) converters can provide voltage and frequency support in grid-connected mode, and power local loads in islanded mode. Multiple GFM converters connected to the same point of common coupling (PCC) should not only ensure harmonic current sharing, but also reduce the PCC voltage harmonics. Most of the existi...
Article
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The purpose of this paper is the study of a binomial sum with a parameterized analogue of the k-th harmonic number of order s. Thé Basic čase od these binomial sums were investigated by Mneimneh, who gave a probabilistic interpretation related to hiring problems. We present a generalization of Mneimneh's summation formula and establish several new...
Preprint
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A coupled boundary spectral element method (BSEM) and spectral element method (SEM) formulation for the propagation of small-amplitude water waves over variable bathymetries is presented in this work. The wave model is based on the mild-slope equation (MSE), which provides a good approximation of the propagation of water waves over irregular bottom...
Article
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Vietnam's electrical infrastructure has undergone notable advancements in recent times. Nevertheless, concerns pertaining to under-voltage, over-voltage, and voltage fluctuations persist in rural, mountainous, and industrial regions. This results in the inefficient operation of electrical equipment, disruptions in industrial production processes, d...
Article
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The Gravity Recovery and Climate Experiment (GRACE) mission provides original observations to different institutions for the production of various monthly time-variable gravity field models (TVGFMs). Aiming to optimize the signal-to-noise ratio of TVGFMs, we determine to combine them in the spatial domain. This combination comprises two approaches:...
Article
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It is known that the harmonic mean estimator is a consistent estimator of the marginal likelihood and is easy to implement, but it has severe biases and does not change as much as the prior distribution changes. In this study, we investigate the use of the harmonic mean estimator to select the hypothetical income distribution from grouped data thro...
Article
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This work reports on the theoretical generation of isolated soft-X ray 106 attosecond pulse within the water window spectral region, through interacting a chirped two-color femtosecond laser pulse with a hydrogen atom. To construct this pulse, a chirped 3.5 optical cycle (9.33 fs) laser pulse with a wavelength of 800 nm and an intensity of \documen...
Preprint
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This paper presents a boundary element formulation for the solution of the Mild-Slope equation in wave propagation problems with variable water depth in one direction. Based on the Green's function approximation proposed by Belibassakis \cite{Belibassakis2000}, a complete fundamental-solution kernel is developed and combined with a boundary element...
Article
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An enhanced control scheme of a double-powered asynchronous generator (DPAG) integrated into a variable-speed contra-rotating wind turbine (VSCRWT) generation system is displayed in this paper. The original idea treated here is to develop a robust direct power control (DPC) using a new kind of proportional-integral (PI) regulator based on feedback...
Article
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This paper is investigating the moderation effect of institutional ownership on the relationship between audit committee characteristics and corporate sustainability disclosure. The study was formed on agency and stakeholder theories, using secondary data from 708 firm-year observations spanning 2012–2022. The findings indicated that audit committe...
Article
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The application of electric fields induces changes in the symmetry of crystals, which can be observed spectroscopically as variations in the even harmonic generation. In this study, we report the ultrafast modulation of GaAs crystal symmetry using strong terahertz field. The modulation is recorded by the vibration of even harmonic intensity which d...
Article
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A two-stage power factor correction (PFC) topology achieves a higher power factor quality and lower harmonic distortion than a single-stage converter. This paper introduces a two-stage PFC topology using a parallel boost and flyback converter which is employed as a voltage regulator The main boost converter is used for PFC and the other is the acti...
Thesis
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Density functional theory (DFT) is commonly used for evaluating the thermal propertiesand equation of state of solids, usually within the quasi-harmonic approximation (QHA). In transition metals, thermodynamic quantities such as the thermal pressure and Gruneisen parameter are poorly reproduced compared with experimental values or with direct compu...
Preprint
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We present Branch-Train-Stitch (BTS), an efficient and flexible training algorithm for combining independently trained large language model (LLM) experts into a single, capable generalist model. Following Li et al., we start with a single seed language model which is branched into domain-specific (e.g., coding or math) experts with continual pretra...
Article
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The present research paper presents a novel control strategy developed to maximize the utilization of grid-connected photovoltaic (PV) systems incorporated with battery backup. It is intended to provide enhanced power quality across a range of operating modes. The designed controller coordinates uninterrupted power transfer from PV modules to the g...
Article
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In recent decades, control of the spatial structure of electromagnetic waves has boosted the research of new modulation formats for telecommunications and quantum applications. In particular, the exploitation of orthogonal spatial modes as distinct information carriers in the so-called spatial-division multiplexing has been dominated so far by beam...
Preprint
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Suppose a quantum harmonic oscillator has a counterpart with oscillation in time; what properties will this oscillator possess? In this paper, we study a field that can excite its underlying spacetime and have the properties of a bosonic field. A particle in this field is a harmonic oscillator in time, also known as a proper time oscillator, which...
Article
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The performance of Alexander Scriabin's Preludes Op. 11 poses distinct problems and opportunities for contemporary pianists. These preludes, written in all 24 major and minor keys, embody the emotional profundity and developing harmonic language of late Romantism, leading to Scriabin’s more avant-garde compositions. Contemporary performance practic...