cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Symbolic Regression with Fast Function Extraction and Nonlinear Least Squares Optimization
Creators: name: Kammerer, Lukas
name: Kronberger, Gabriel
name: Kommenda, Michael
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Fast Function Extraction (FFX) is a deterministic algorithm for solving symbolic regression problems. We improve the accuracy of FFX by adding parameters to the arguments of nonlinear functions. Instead of only optimizing linear parameters, we optimize these additional nonlinear parameters with separable nonlinear least squared optimization using a variable projection algorithm. Both FFX and our new algorithm is applied on the PennML benchmark suite. We show that the proposed extensions of FFX leads to higher accuracy while providing models of similar length and with only a small increase in runtime on the given data. Our results are compared to a large set of regression methods that were already published for the given benchmark suite.
description: Submitted manuscript to be published in Computer Aided Systems Theory - EUROCAST 2022: 18th International Conference, Las Palmas de Gran Canaria, Feb. 2022
Stationary Charge Radiation in Anisotropic Photonic Time Crystals
Creators: name: Li, Huanan
name: Yin, Shixiong
name: He, Huan
name: Xu, Jingjun
name: Alù, Andrea
name: Shapiro, Boris
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Time metamaterials exhibit a great potential for wave manipulation, drawing increasing attention in recent years. Here, we explore the exotic wave dynamics in an anisotropic photonic time crystal (APTC), formed by an anisotropic medium whose optical properties are uniformly and periodically changed in time. Based on a temporal transfer matrix formalism, we show that a stationary charge embedded in an APTC can emit radiation, in contrast to the case of an isotropic photonic time crystal, and its distribution in momentum space is controlled by the APTC band structure. Our approach extends the functionalities of time metamaterials, offering new opportunities for simultaneous radiation generation and control, with implications for both classical and quantum applications.
description: The updated version with the supplement
Frequency domain reduced order models for gravitational waves from aligned-spin compact binaries
Creators: name: Pürrer, Michael
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Black-hole binary coalescences are one of the most promising sources for the first detection of gravitational waves. Fast and accurate theoretical models of the gravitational radiation emitted from these coalescences are highly important for the detection and extraction of physical parameters. Spinning effective-one-body (EOB) models for binaries with aligned spins have been shown to be highly faithful, but are slow to generate and thus have not yet been used for parameter estimation studies. I provide a frequency-domain singular value decomposition (SVD)-based surrogate reduced order model that is thousands of times faster for typical system masses and has a faithfulness mismatch of better than $\sim 0.1\%$ with the original SEOBNRv1 model for advanced LIGO detectors. This model enables parameter estimation studies up to signal-to-noise ratios (SNRs) of 20 and even up to SNR 50 for total masses below $50 M_\odot$. This article discusses various choices for approximations and interpolation over the parameter space that can be made for reduced order models of spinning compact binaries, provides a detailed discussion of errors arising in the construction and assesses the fidelity of such models.
description: 36 pages, 19 figures, version published in CQG
Construcción de un microscopio de barrido en la frecuencia de las microondas para estudios de campo cercano /
Creators: name: Rios Osuna, Luis Antonio
Publisher: name: Universidad Autónoma de Baja California.
Year: 2022
Subjects: subject: QC372.2.D4 R56 1999

description: Se presenta el diseño, la construcción y la calibración de un microscopio de barrido en la frecuencia de las microondas para estudios de la intensidad de campo cercano.
ความพึงพอใจในการปฏิบัติงานของบุคลากรภาครัฐต่อการเป็น มหาวิทยาลัยในกำกับของรัฐ
Creators: name: พิชญา หอมหวล
name: ธีระวัฒน์ จันทึก
Publisher: name: สถาบันวิจัยและพัฒนา มหาวิทยาลัยศิลปากร
Year: 2561
Subjects: บุคลากรภาครัฐ
มหาวิทยาลัยในกำกับของรัฐ
ความพึงพอใจในการปฏิบัติงาน

description: วารสารมหาวิทยาลัยศิลปากร, 38, 5, 80-98
Shape-constrained Symbolic Regression with NSGA-III
Creators: name: Haider, Christian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Shape-constrained symbolic regression (SCSR) allows to include prior knowledge into data-based modeling. This inclusion allows to ensure that certain expected behavior is better reflected by the resulting models. The expected behavior is defined via constraints, which refer to the function form e.g. monotonicity, concavity, convexity or the models image boundaries. In addition to the advantage of obtaining more robust and reliable models due to defining constraints over the functions shape, the use of SCSR allows to find models which are more robust to noise and have a better extrapolation behavior. This paper presents a mutlicriterial approach to minimize the approximation error as well as the constraint violations. Explicitly the two algorithms NSGA-II and NSGA-III are implemented and compared against each other in terms of model quality and runtime. Both algorithms are capable of dealing with multiple objectives, whereas NSGA-II is a well established multi-objective approach performing well on instances with up-to 3 objectives. NSGA-III is an extension of the NSGA-II algorithm and was developed to handle problems with "many" objectives (more than 3 objectives). Both algorithms are executed on a selected set of benchmark instances from physics textbooks. The results indicate that both algorithms are able to find largely feasible solutions and NSGA-III provides slight improvements in terms of model quality. Moreover, an improvement in runtime can be observed using the many-objective approach.
description: Submitted manuscript to be published in Computer Aided Systems Theory - EUROCAST 2022: 18th International Conference, Las Palmas de Gran Canaria, Feb. 2022
โครงสร้างผู้ถือหุ้น ผลการประเมินการกำกับดูแลกิจการ ผลการประเมินความยั่งยืน ที่มีอิทธิพลต่อผลการดำเนินงานของบริษัทที่จดทะเบียนในตลาดหลักทรัพย์แห่งประเทศไทย
Creators: name: ภัทรา เตชะธนเศรษฐ์
name: อรวรรณ เชื้อเมืองพาน
name: พรชัย เตชะธนเศรษฐ์
Publisher: name: สถาบันวิจัยและพัฒนา มหาวิทยาลัยศิลปากร
Year: 2561
Subjects: โครงสร้างผู้ถือหุ้น
ผลการประเมินการกำกับดูแลกิจการ
ผลการประเมินความยั่งยืน

description: วารสารมหาวิทยาลัยศิลปากร, 38, 5, 99-118
Loop Quantum Gravity effects on electromagnetic properties of charged leptons
Creators: name: Melo, João Paulo S.
name: Neves, Mario J.
name: Paixão, Jefferson M. A.
name: Helayël-Neto, José A.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The efforts in this contribution consist in reassessing a modified Dirac equation that incorporates a $γ^0 γ_5$-Lorentz-symmetry violating (LSV) term induced as a Loop Quantum Gravity (LQG) effect. Originally, this equation has been applied and considered as a good scenario for describing a number of investigations on the flight time of cosmic neutrinos, which suggests that the speed, in vacuum, in connection with the geometry that describes a granular space-time, takes the energy-dependent form, e.g., $v(E) =1 \pm E/E_{\textrm{LSV}}$, with $E_{\textrm{LSV}} \approx 6,5 \times 10^{17}$ GeV for neutrinos. Once LQG provides a viable way to understand this picture consistently, we pursue an analysis of this effective Dirac equation to inspect some of its properties. These include: the derivation of the modified fermionic propagator, attainment of the Gordon decomposition of the vector current with minimal electromagnetic coupling to obtain information on the form factors, examination of the non-relativistic limit of the equation, evaluation of the spin- and velocity-dependent corrections to the Coulomb potential due to LQG effects, and the modified Hamiltonian in the low-relativistic regime. The study of the form factors may open up paths to set up bounds on the LQG parameters from the precision measurements of electromagnetic attributes of the charged leptons, such as their respective electric and magnetic dipole moments.
description: 12 pages, 2 figures
Fermion production from real-time lattice gauge theory in the classical-statistical regime
Creators: name: Kasper, Valentin
name: Hebenstreit, Florian
name: Berges, Jürgen
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the real-time dynamics of U(1) and SU(N) gauge theories coupled to fermions on a lattice. While real-time lattice gauge theory is not amenable to standard importance sampling techniques, for a large class of time-dependent problems the quantum dynamics can be accurately mapped onto a classical-statistical ensemble. We illustrate the genuine quantum contributions included in this description by giving a diagrammatic representation in a series expansion. The non-perturbative simulation method is then applied to electron-positron production in quantum electrodynamics in three spatial dimensions. We compare to analytic results for constant background field and demonstrate the importance of back-reaction of the produced fermion pairs on the gauge fields.
description: 17 pages, 10 figures, Revised version: minor corrections, PRD Version
Phonons in stringlet-land and the boson peak
Creators: name: Jiang, Cunyuan
name: Baggioli, Matteo
Publisher: name: arXiv
Year: 2024
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Solid materials that deviate from the harmonic crystal paradigm exhibit characteristic anomalies in the specific heat and vibrational density of states (VDOS) with respect to Debye's theory predictions. The boson peak (BP), a low-frequency excess in the VDOS over Debye law $g(ω) \propto ω^2$, is certainly the most famous among them; nevertheless, its origin is still subject of fierce debate. Recent simulation works provided strong evidence that localized one-dimensional string-like excitations (stringlets) might be the microscopic origin of the BP. In this work, we study the dynamics of acoustic phonons interacting with a bath of vibrating 1D stringlets with exponentially distributed size, as observed in simulations. We show that stringlets strongly renormalize the phonon propagator and naturally induce a BP anomaly in the vibrational density of states, corresponding to the emergence of a dispersionless BP flat mode. Additionally, phonon-stringlet interactions produce a strong enhancement of sound attenuation and a dip in the speed of sound near the BP frequency, consistent with experimental and simulation data. The qualitative trends of the BP frequency and intensity are predicted within the model and shown to be in good agreement with previous observations. In summary, our results substantiate with a simple theoretical model the recent simulation results by Hu and Tanaka claiming the origin of the BP from stringlet dynamics.
description: v2: matching the published version in Journal of Physics: Condensed Matter
Identifying Differential Equations to predict Blood Glucose using Sparse Identification of Nonlinear Systems
Creators: name: Jödicke, David
name: Parra, Daniel
name: Kronberger, Gabriel
name: Winkler, Stephan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Describing dynamic medical systems using machine learning is a challenging topic with a wide range of applications. In this work, the possibility of modeling the blood glucose level of diabetic patients purely on the basis of measured data is described. A combination of the influencing variables insulin and calories are used to find an interpretable model. The absorption speed of external substances in the human body depends strongly on external influences, which is why time-shifts are added for the influencing variables. The focus is put on identifying the best timeshifts that provide robust models with good prediction accuracy that are independent of other unknown external influences. The modeling is based purely on the measured data using Sparse Identification of Nonlinear Dynamics. A differential equation is determined which, starting from an initial value, simulates blood glucose dynamics. By applying the best model to test data, we can show that it is possible to simulate the long-term blood glucose dynamics using differential equations and few, influencing variables.
description: Submitted manuscript to be published in Computer Aided Systems Theory - EUROCAST 2022: 18th International Conference, Las Palmas de Gran Canaria, Feb. 2022
Quantum speed limits and optimal Hamiltonians for driven systems in mixed states
Creators: name: Andersson, Ole
name: Heydari, Hoshang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Inequalities of Mandelstam-Tamm and Margolus-Levitin type provide lower bounds on the time it takes for a quantum system to evolve from one state into another. Knowledge of such bounds, called quantum speed limits, is of utmost importance in virtually all areas of physics, where determination of the minimum time required for a quantum process is of interest. Most Mandelstam-Tamm and Margolus-Levitin inequalities found in the literature have been derived from growth estimates for the Bures length, which is a statistical distance measure. In this paper we derive such inequalities by differential geometric methods, and we compare the obtained quantum speed limits with those involving the Bures length. We also characterize the Hamiltonians which optimize the evolution time for generic finite-level quantum systems.
description: 15 pages, 4 figures, accepted for publication in J. Phys. A: Math. Theor
Η βιώσιμη οικονομία του 21ου αιώνα : η εξέλιξη του μοντέλου Doughnut και η εφαρμογή του σε σύγχρονες ευρωπαϊκές πόλεις
Creators: name: Γιακουμέλου, Θεοδώρα
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2023
Subjects: subject: Βιωσιμότητα
subject: Κυκλική οικονομία
subject: Στόχοι Βιώσιμης Ανάπτυξης
subject: Μοντέλο Doughnut
subject: Πλανητικά όρια
subject: Κοινωνική ανάπτυξη

description: Η κλιματική μετάβαση αποτελεί μία πρόκληση για τις σύγχρονες κοινωνίες ιδιαίτερα στον τομέα της οικονομικής ανάπτυξης και της άσκησης πολιτικής. Στόχος της συγκεκριμένης εργασίας είναι η κατανόηση της εξέλιξης της βιωσιμότητας και οι τρόποι με τους οποίους οδήγησε στην δημιουργία του του μοντέλου Doughnut και των αρχών που πρεσβεύει. Αναλύονται εκτενώς τα επιμέρους στοιχεία που διαμορφώνουν το μοντέλο τα οποία αφορούν τα πλανητικά όρια, τον κοινωνικό ιστό και τον χώρο ανάπτυξης της ανθρωπότητας που βρίσκεται ανάμεσα σε αυτά τα δύο σημεία. Στο τελευταίο μέρος της εργασίας αναλύεται η αξία της εφαρμογής τους συγκεκριμένου μοντέλου για την επίτευξη της βιώσιμης ανάπτυξης και της κυκλικής οικονομίας μέσω συγκεκριμένων παραδειγμάτων που αφορούν την εφαρμογή του από οργανισμούς τοπικής αυτοδιοίκησης σε μεγάλες ευρωπαϊκές πόλεις.
Optical supernova remnants in nearby galaxies and their influence on star formation rates derived from H$α$ emission
Creators: name: Vucetic, M. M.
name: Arbutina, B.
name: Urosevic, D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In this paper we present the most up-to-date list of nearby galaxies with optically detected supernova remnants (SNRs). We discuss the contribution of the Hα flux from the SNRs to the total Hα flux and its influence on derived star formation rate (SFR) for 18 galaxies in our sample. We found that the contribution of SNRs' flux to the total Hα flux is 5 $\pm$ 5 per cent. Due to the observational selection effects, the SNRs contamination of SFRs derived herein represents only a lower limit.
description: 18 pages, 4 figures, 3 tables + appendix; accepted by MNRAS
Spontaneous symmetry breaking and ghost states supported by the fractional nonlinear Schrödinger equation with focusing saturable nonlinearity and PT-symmetric potential
Creators: name: Zhong, Ming
name: Wang, Li
name: Li, Pengfei
name: Yan, Zhenya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report a novel spontaneous symmetry breaking phenomenon and ghost states existed in the framework of the fractional nonlinear Schrödinger (FNLS) equation with focusing saturable nonlinearity and PT-symmetric potential. The continuous asymmetric soliton branch bifurcates from the fundamental symmetric one as the power exceeds some critical value. Intriguingly, the symmetry of fundamental solitons is broken into two branches of asymmetry solitons (alias ghost states) with complex conjugate propagation constants, which is solely in fractional media. Besides, the dipole (antisymmetry) and tripole solitons are also studied numerically. Moreover, we analyze the influences of fractional Lévy index and saturable nonlinear parameters on the symmetry breaking of solitons in detail. And the stability of fundamental soliton, asymmetric, dipole and tripole solitons are explored via the linear stability analysis and direct propagations. Moreover, we explore the elastic/semi-elastic collision phenomena between symmetric and asymmetric solitons. Meanwhile, we find the stable excitations from the fractional diffraction with saturation nonlinearity to integer-order diffraction with Kerr nonlinearity via the adiabatic excitations of parameters. These results will provide some theoretical basis for the study of spontaneous symmetry breaking phenomena and related physical experiments in the fractional media with PT-symmetric potentials.
description: 12 pages, 8 figures
Diseño y construcción de un perfilometro para láseres de CO2 de 1-200 W /
Creators: name: Lopez Villegas, Ruben
Publisher: name: Universidad Autónoma de Baja California.
Year: 2022
Subjects: subject: TA1677 L66 1999

description: El tema principal del presente trabajo está relacionado con la visualización y caracterización del haz de un láser de bióxido de carbono CO2.
Crowdinvesting als Finanzierungsalternative für kleine und mittlere Unternehmen
Creators: name: Dorfleitner, Gregor
name: Kapitz, Jonas
name: Wimmer, Maximilian
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: Finanzierung kleiner und mittlerer Unternehmen, Social Networks, Mezzanine
subject: 330 Wirtschaft

description: Crowdinvesting, also das Finden von vielen Eigenkapital-orientierten Kapitalgebern über eine Internet-basierte Plattform, ist eine relativ neue Möglichkeit für kleine Unternehmen, an Kapi-tal zu gelangen. Dieser Beitrag untersucht auf Basis erster Daten für den deutschen Markt die Konditionen, zu denen solche Finanzierungen für Unternehmen abgewickelt werden, und dis-kutiert die Eignung von Crowdinvesting zur Finanzierung von kleinen und mittleren Unter-nehmen. Es stellt sich heraus, dass derzeit nur sehr kleine Unternehmen per Crowdinvesting Kapital einsammeln, wobei die durchschnittliche Fundingsumme bei knapp 143.000 Euro und die durchschnittliche Anzahl an Investoren bei 238 liegt.
General quantum-classical dynamics as measurement based feedback
Creators: name: Tilloy, Antoine
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This note derives the stochastic differential equations and partial differential equation of general hybrid quantum--classical dynamics from the theory of continuous measurement and general (non-Markovian) feedback. The advantage of this approach is an explicit parameterization, without additional positivity constraints. The construction also neatly separates the different effects: how the quantum influences the classical and how the classical influences the quantum. This modular presentation gives a better intuition of what to expect from hybrid dynamics, especially when used to construct possibly fundamental theories.
description: 14 + 6 pages
Radiation Reaction in Quantum Vacuum
Creators: name: Seto, Keita
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: From the development of the electron theory by H. A. Lorentz in 1906, many authors have tried to reformulate this model named "radiation reaction". P. A. M. Dirac derived the relativistic-classical electron model in 1938, which is now called the Lorentz-Abraham-Dirac model. But this model has the big difficulty of the run-away solution. Recently, this equation has become important for ultra-intense laser-electron (plasma) interactions. Therefore, it is desirable to stabilize this model of the radiation reaction for estimations. Via my recent research, I found a stabilized model of radiation reaction in quantum vacuum. This leads us to an updated Fletcher-Millikan's charge to mass ratio including radiation, de/dm, derived as the 4th order tensor measure. In this paper, I will discuss the latest update of the model and the ability of the equation of motion with radiation reaction in quantum vacuum via photon-photon scatterings.
description: 17 pages, 2 figure. The update model of Prog. Theor. Exp. Phys. 2014, 043A101 (2014). [arXiv:1310.6646v3] Major Version UP
Dynamics of mixed quantum-classical spin systems
Creators: name: Gay-Balmaz, François
name: Tronci, Cesare
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Mathematical Physics (math-ph)
subject: Symplectic Geometry (math.SG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Mixed quantum-classical spin systems have been proposed in spin chain theory and, more recently, in magnon spintronics. However, current models of quantum-classical dynamics beyond mean-field approximations typically suffer from long-standing consistency issues, and, in some cases, invalidate Heisenberg's uncertainty principle. Here, we present a fully Hamiltonian theory of quantum-classical spin dynamics that appears to be the first to ensure an entire series of consistency properties, including positivity of both the classical and the quantum density, so that Heisenberg's principle is satisfied at all times. We show how this theory may connect to recent energy-balance considerations in measurement theory and we present its Poisson bracket structure explicitly. After focusing on the simpler case of a classical Bloch vector interacting with a quantum spin observable, we illustrate the extension of the model to systems with several spins, and restore the presence of orbital degrees of freedom.
description: Submitted as a contribution to the Special Collection "Koopman methods in classical and quantum-classical mechanics" in the Journal of Physics A. Revised version
title: Η ψυχρή εφοδιαστική αλυσίδα στις θαλάσσιες μεταφορές
title: The cold supply chain in sea transportation
titleType: AlternativeTitle
Creators: name: Κεραμυδάς, Χρήστος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Ψυχρή εφοδιαστική αλυσίδα
Θαλάσσιες μεταφορές
Ευπαθή προϊόντα
Εφοδιαστική αλυσίδα
Blockchain
Internet of things
Τεχνολογίες παρακολούθησης

description: Η παρούσα εργασία σκοπεύει να αναδείξει τις θαλάσσιες μεταφορές στην Ψυχρή Εφοδιαστική Αλυσίδα. Η εργασία αποτελεί μια προσπάθεια καταγραφής της ήδη υπάρχουσας γνώσης στο υπό εξέταση αντικείμενο. Βιβλιογραφικές και αρθρογραφικές πηγές προσέδωσαν το υλικό για την απόδοση της σημαντικότητας των θαλάσσιων μεταφορών στην Ψυχρή Εφοδιαστική Αλυσίδα. Η εργασία διακρίθηκε σε πέντε κεφάλαια. Μέσα από την ενασχόληση με την Εφοδιαστική Αλυσίδα, την εμπλοκή λιμένων στην Εφοδιαστική Αλυσίδα, την Ψυχρή Εφοδιαστική Αλυσίδα, τη θαλάσσια μεταφορά προϊόντων μέσα από τη Ψυχρή Εφοδιαστική Αλυσίδα, τις τεχνολογίες παρακολούθησης συνθήκων μεταφοράς (IoT, Blockchain) στην Ψυχρή Εφοδιαστική Αλυσίδα και οι τάσεις / προοπτικές / προκλήσεις. Οι θαλάσσιες μεταφορές αποτελούν ένα μέσο για την μελλοντική μεγέθυνση του κυκλώματος της παγκόσμιας διακίνησης προϊόντων μέσω της Ψυχρή Εφοδιαστικής Αλυσίδας. Το παγκόσμιο εμπόριο έχει μόνο να κερδίσει από την εμπλοκή των διακινήσεων προϊόντων δια θαλάσσης και να εκμεταλλευτεί την Ψυχρή Εφοδιαστική Αλυσίδα ως μια νέα πρόκληση στο διεθνές εμπόρια, στην οικονομική και την επιχειρηματικότητα.
สิริมงคลจีนกับความเชื่อตามศาสตร์ฮวงจุ้ยของชาวไทยเชื้อสายจีนในชุมชนเยาวราช
Creators: name: สุภัทรา โยธินศิริกุล
Publisher: name: สถาบันวิจัยและพัฒนา มหาวิทยาลัยศิลปากร
Year: 2561
Subjects: สิริมงคลจีน
ความเชื่อตามศาสตร์ฮวงจุ้ย
ชาวไทยเชื้อสายจีน
ชุมชนเยาวราช

description: วารสารมหาวิทยาลัยศิลปากร, 38, 5, 119-143
The honeycomb lattice with multi-orbital structure: topological and quantum anomalous Hall insulators with large gaps
Creators: name: Zhang, Gu-Feng
name: Li, Yi
name: Wu, Congjun
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We construct a minimal four-band model for the two-dimensional (2D) topological insulators and quantum anomalous Hall insulators based on the $p_x$- and $p_y$-orbital bands in the honeycomb lattice. The multiorbital structure allows the atomic spin-orbit coupling which lifts the degeneracy between two sets of on-site Kramers doublets $j_z=\pm\frac{3}{2}$ and $j_z=\pm\frac{1}{2}$. Because of the orbital angular momentum structure of Bloch-wave states at $Γ$ and $K(K^\prime)$ points, topological gaps are equal to the atomic spin-orbit coupling strengths, which are much larger than those based on the mechanism of the $s$-$p$ band inversion. In the weak and intermediate regime of spin-orbit coupling strength, topological gaps are the global gap. The energy spectra and eigen wave functions are solved analytically based on Clifford algebra. The competition among spin-orbit coupling $λ$, sublattice asymmetry $m$ and the Néel exchange field $n$ results in band crossings at $Γ$ and $K (K^\prime)$ points, which leads to various topological band structure transitions. The quantum anomalous Hall state is reached under the condition that three gap parameters $λ$, $m$, and $n$ satisfy the triangle inequality. Flat bands also naturally arise which allow a local construction of eigenstates. The above mechanism is related to several classes of solid state semiconducting materials.
description: 14 pages, 6 figures
Three-dimensional N=2 supergravity theories: From superspace to components
Creators: name: Kuzenko, Sergei M.
name: Lindstrom, Ulf
name: Rocek, Martin
name: Sachs, Ivo
name: Tartaglino-Mazzucchelli, Gabriele
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: For general off-shell N=2 supergravity-matter systems in three spacetime dimensions, a formalism is developed to reduce the corresponding actions from superspace to components. The component actions are explicitly computed in the cases of Type I and Type II minimal supergravity formulations. We describe the models for topologically massive supergravity which correspond to all the known off-shell formulations for three-dimensional N=2 supergravity. We also present a universal setting to construct supersymmetric backgrounds associated with these off-shell supergravities.
description: 79 pages; V3: minor corrections, version published in PRD
Truncated atomic plane wave method for the subband structure calculations of Moiré systems
Creators: name: Miao, Wangqian
name: Li, Chu
name: Han, Xu
name: Pan, Ding
name: Dai, Xi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We propose a highly efficient and accurate numerical scheme named Truncated Atomic Plane Wave (TAPW) method to determine the subband structure of Twisted Bilayer Graphene (TBG) inspired by BM model. Our method utilizes real space information of carbon atoms in the moiré unit cell and projects the full tight binding Hamiltonian into a much smaller subspace using atomic plane waves. We present accurate electronic band structures of TBG in a wide range of twist angles together with detailed moiré potential and screened Coulomb interaction at the first magic angle using our new method. Furthermore, we generalize our formalism to solve the problem of low frequency moiré phonons in TBG.
Detecting clinical practice guideline-recommended wheelchair propulsion patterns with wearable devices following a wheelchair propulsion intervention
Creators: name: Chen, Pin-Wei
name: Klaesner, Joe
name: Zwir, Igor
name: Morgan, Kerri A.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Space Science
subject: Medicine
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: Wheelchair propulsion interventions typically teach manual wheelchair users to perform wheelchair propulsion biomechanics as recommended by the Clinical Practice Guidelines (CPG). Outcome measures for these interventions are primarily laboratory based. Discrepancies remain between manual wheelchair propulsion (MWP) in laboratory-based examinations and propulsion in the real-world. Current developments in machine learning (ML) allow for monitoring of MWP in the real world. In this study, we collected data from participants enrolled in two wheelchair propulsion interventions, then built an ML algorithm to distinguish CPG recommended MWP patterns from non-CPG-recommended patterns. Eight primary manual wheelchair users did not initially follow CPG recommendations but learned and performed CPG propulsion after the interventions. Participants each wore two inertial measurement units as they propelled their wheelchairs on a roller system, indoors overground, and outdoors. ML models were trained to classify propulsion patterns as following the CPG or not following the CPG. Video recordings were used for reference. For indoor detection, we found that a subject-independent model was able to achieve 85% accuracy. For outdoor detection, we found that the subject-independent model achieved 75.4% accuracy. These results provide further evidence that CPG and non-CPG-recommended MWP patterns can be predicted with wearable sensors using an ML algorithm.
Supplementary Appendix from What are patterns of rise and decline?
Creators: name: Raulo, Aura
name: Rojas, Alexis
name: Kröger, Björn
name: Laaksonen, Antti
name: Orta, Carlos Lamuela
name: Nurmio, Silva
name: Peltoniemi, Mirva
name: Lahti, Leo
name: Žliobaitė, Indrė
Publisher: name: The Royal Society
Year: 2023
Subjects: classificationCode: 310114
subject: Systems biology
classificationCode: 310199
subject: Biochemistry and cell biology not elsewhere classified
classificationCode: 319999
subject: Other biological sciences not elsewhere classified

description: The notions of evolution and other forms of change across research fields
Superconducting resonators with voltage-controlled frequency and nonlinearity
Creators: name: Strickland, William M.
name: Elfeky, Bassel Heiba
name: Yuan, Joseph O'Connell
name: Schiela, William F.
name: Yu, Peng
name: Langone, Dylan
name: Vavilov, Maxim G.
name: Manucharyan, Vladimir E.
name: Shabani, Javad
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Voltage-tunable superconductor-semiconductor devices offer a unique platform to realize dynamic tunability in superconducting quantum circuits. By galvanically connecting a gated InAs-Al Josephson junction to a coplanar waveguide resonator, we demonstrate the use of a wide-range gate-tunable superconducting element. We show that the resonant frequency is controlled via a gate-tunable Josephson inductance and that the non-linearity of the voltage-controlled InAs-Al junction is non-dissipative as is the case with conventional Al-AlO$_{x}$ junctions. As the gate voltage is decreased, the inductive participation of the junction increases up to $44\%$, resulting in the resonant frequency being tuned by over 2 GHz. Utilizing the wide tunability of the device, we demonstrate that two resonant modes can be adjusted such that they strongly hybridize, exhibiting an avoided level crossing with a coupling strength of 51 MHz. Implementing such voltage-tunable resonators is the first step toward realizing wafer-scale continuous voltage control in superconducting circuits for qubit-qubit coupling, quantum-limited amplifiers, and quantum memory platforms.
Improved Moving-Puncture Techniques for Compact Binary Simulations
Creators: name: Etienne, Zachariah B.
Publisher: name: arXiv
Year: 2024
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: To fully unlock the scientific potential of upcoming gravitational wave (GW) interferometers, numerical relativity (NR) simulation accuracy will need to be greatly enhanced. We present three infrastructure-agnostic improvements to the moving-puncture approach for binary black hole (BBH) simulations, aimed at greatly reducing constraint violation and improving GW predictions. Although these improvements were developed within the highly efficient NR code BlackHoles@Home, we demonstrate their effectiveness in the widely-adopted Einstein Toolkit/Carpet AMR framework. Our improvements include a modified Kreiss-Oliger dissipation prescription, a Hamiltonian-constraint-damping adjustment to the BSSN equations, and an extra term to the 1+log lapse evolution equation that slows the development of the sharp lapse feature, which dominates numerical errors in BBH simulations. With minimal increase in computational cost, these improvements greatly reduce GW noise, enabling the extraction of high-order GW modes previously obscured by numerical noise. They also improve convergence properties near and inside the convergent regime, reduce Hamiltonian (momentum) constraint violations in the strong-field region by roughly two (three) orders of magnitude, and in the GW-extraction zone by five (two) orders of magnitude. To promote community adoption, we have open-sourced the improved Einstein Toolkit thorn BaikalVacuum used in this work. Although our focus is on BBH evolutions and the BSSN formulation, these improvements may also benefit compact binary simulations involving matter and other formulations, a focus for future investigations.
description: 17 pages, 15 figures; matches published version
สัญญาของนามรูป ในวิถีชีวิตชนบทอีสาน
Creators: name: เรืองศักดิ์ ปัดถาวะโร
Publisher: name: สถาบันวิจัยและพัฒนา มหาวิทยาลัยศิลปากร
Year: 2561
Subjects: สัญญา
นามรูป
วิถีชีวิต
ฮีต

description: วารสารมหาวิทยาลัยศิลปากร, 38, 5, 144-161
Effect of 3D printed insoles for people with flatfeet: A systematic review
Creators: name: Daryabor, Aliyeh
name: Kobayashi, Toshiki
name: Saeedi, Hassan
name: Lyons, Samuel M.
name: Maeda, Noriaki
name: Naimi, Sedigheh Sadat
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Science Policy
subject: 111714 Mental Health
subject: FOS: Health sciences

description: This systematic review aimed to evaluate custom-made 3D printed insoles for people with flatfeet. PubMed, Embase, ISI web of knowledge, ProQuest, Scopus, and Cochrane databases, were searched from inception until January 2022. The quality assessment of included studies was performed through the Downs and Black checklist. A narrative analysis was performed since a meta-analysis could not be conducted. Ten studies including 225 subjects with flexible flatfeet were chosen for final evaluation. Although the evidence from selected literature was generally weak, using insoles with 3D printing technology may positively affect pain (comfort score) and foot function, with no significant change in vertical loading rate during walking or running. There were discrepancies among studies for plantar pressures, center of pressure trajectories, 3D ankle joint kinematics and kinetics of gait while wearing these insoles. Dose-response effects of medial posting on 3D printed insoles suggested beneficial effects on lower limb gait biomechanics in people with flatfeet. There was insufficient evidence to conclude the comparison between 3D printed insoles and other types of insoles. In conclusion, using a 3D printed insole may improve comfort score and foot function in people with flatfeet.
A conservative effect of the second-order gravitational self-force on quasicircular orbits in Schwarzschild spacetime
Creators: name: Pound, Adam
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: A compact object moving on a quasicircular orbit about a Schwarzschild black hole gradually spirals inward due to the dissipative action of its gravitational self-force. But in addition to driving the inspiral, the self-force has a conservative piece. Within a second-order self-force formalism, I derive a second-order generalization of Detweiler's redshift variable, which provides a gauge-invariant measure of conservative effects on quasicircular orbits. I sketch a frequency-domain numerical scheme for calculating this quantity. Once this scheme has been implemented, its results may be used to determine high-order terms in post-Newtonian theory and parameters in effective-one-body theory.
description: 20 pages, 1 figure, version to appear in PRD, additional references, minor typos corrected
Deep learning phase recovery: data-driven, physics-driven, or combining both?
Creators: name: Wang, Kaiqiang
name: Lam, Edmund Y.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Image and Video Processing (eess.IV)
subject: Machine Learning (cs.LG)
subject: Optics (physics.optics)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Phase recovery, calculating the phase of a light wave from its intensity measurements, is essential for various applications, such as coherent diffraction imaging, adaptive optics, and biomedical imaging. It enables the reconstruction of an object's refractive index distribution or topography as well as the correction of imaging system aberrations. In recent years, deep learning has been proven to be highly effective in addressing phase recovery problems. Two most direct deep learning phase recovery strategies are data-driven (DD) with supervised learning mode and physics-driven (PD) with self-supervised learning mode. DD and PD achieve the same goal in different ways and lack the necessary study to reveal similarities and differences. Therefore, in this paper, we comprehensively compare these two deep learning phase recovery strategies in terms of time consumption, accuracy, generalization ability, ill-posedness adaptability, and prior capacity. What's more, we propose a co-driven (CD) strategy of combining datasets and physics for the balance of high- and low-frequency information. The codes for DD, PD, and CD are publicly available at https://github.com/kqwang/DLPR.
description: 24 pages, 13 figures
Discrete scale invariance of the quasi-bound states at atomic vacancies in a topological material
Creators: name: Shao, Zhibin
name: Li, Shaojian
name: Liu, Yanzhao
name: Li, Zi
name: Wang, Huichao
name: Bian, Qi
name: Yan, Jiaqiang
name: Mandrus, David
name: Liu, Haiwen
name: Zhang, Ping
name: Xie, X. C.
name: Wang, Jian
name: Pan, Minghu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Recently, log-periodic quantum oscillations have been detected in topological materials zirconium pentatelluride (ZrTe5) and hafnium pentatelluride (HfTe5), displaying intriguing discrete scale invariance (DSI) characteristic. In condensed materials, the DSI is considered to be related to the quasi-bound states formed by massless Dirac fermions with strong Coulomb attraction, offering a feasible platform to study the long-pursued atomic-collapse phenomenon. Here, we demonstrate that a variety of atomic vacancies in the topological material HfTe5 can host the geometric quasi-bound states with DSI feature, resembling the artificial supercritical atom collapse. The density of states of these quasi-bound states are enhanced and the quasi-bound states are spatially distributed in the "orbitals" surrounding the vacancy sites, which are detected and visualized by low-temperature scanning tunneling microscope/spectroscopy (STM/S). By applying the perpendicular magnetic fields, the quasi-bound states at lower energies become wider and eventually invisible, meanwhile the energies of quasi-bound states move gradually towards the Fermi energy (EF). These features are consistent with the theoretical prediction of a magnetic-field-induced transition from supercritical to subcritical states. The direct observation of geometric quasi-bound states sheds light on the deep understanding of the DSI in quantum materials.
Residual nilpotence and ordering in one-relator groups and knot groups
Creators: name: Chiswell, I. M.
name: Glass, A. M. W.
name: Wilson, John S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: Let $G=< x,t\mid w>$ be a one-relator group, where $w$ is a word in $x,t$. If $w$ is a product of conjugates of $x$ then, associated with $w$, there is a polynomial $A_w(X)$ over the integers, which in the case when $G$ is a knot group, is the Alexander polynomial of the knot. We prove, subject to certain restrictions on $w$, that if all roots of $A_w(X)$ are real and positive then $G$ is bi-orderable, and that if $G$ is bi-orderable then at least one root is real and positive. This sheds light on the bi-orderability of certain knot groups and on a question of Clay and Rolfsen. One of the results relies on an extension of work of G. Baumslag on adjunction of roots to groups, and this may have independent interest.
description: Minor changes, references added
(Pseudo)goldstinos, SUSY fluids, Dirac gravitino and gauginos
Creators: name: Benakli, Karim
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We review the emergence and fate of goldstinos in different frameworks. First, we consider a super-Higgs mechanism when supersymmetry breaking is induced by neither an F-term nor a D-term but related to a more general stress energy-momentum tensor. This allows us to build a novel Lagrangian that describes the propagation of a spin-3/2 state in a fluid. Then we briefly review the ubiquitous pseudo-goldstinos when breaking supersymmetry in an extra dimension. We remind that the fermion (gravitino or gaugino) soft masses can be tuned to be of Dirac-type. Finally, we briefly connect the latter to the study of models with Dirac-type gaugino masses and stress the advantage of having both an F and a D-term sizable contributions for the hierarchies of soft-terms as well as for minimizing R-symmetry breaking.
description: 21 pages
Operator growth and spread complexity in open quantum systems
Creators: name: Carolan, Eoin
name: Kiely, Anthony
name: Campbell, Steve
name: Deffner, Sebastian
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Commonly, the notion of "quantum chaos'' refers to the fast scrambling of information throughout complex quantum systems undergoing unitary evolution. Motivated by the Krylov complexity and the operator growth hypothesis, we demonstrate that the entropy of the population distribution for an operator in time is a useful way to capture the complexity of the internal information dynamics of a system when subject to an environment and is, in principle, agnostic to the specific choice of operator basis. We demonstrate its effectiveness for the Sachdev-Ye-Kitaev (SYK) model, examining the dynamics of the system in both its Krylov basis and the basis of operator strings. We prove that the former basis minimises spread complexity while the latter is an eigenbasis for high dissipation. In both cases, we probe the long-time dynamics of the model and the phenomenological effects of decoherence on the complexity of the dynamics.
description: 7 pages, 2 figures. Close to published version
Towards DMC accuracy across chemical space with scalable $Δ$-QML
Creators: name: Huang, Bing
name: von Lilienfeld, O. Anatole
name: Krogel, Jaron T.
name: Benali, Anouar
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: In the past decade, quantum diffusion Monte Carlo (DMC) has been demonstrated to successfully predict the energetics and properties of a wide range of molecules and solids by numerically solving the electronic many-body Schrödinger equation. We show that when coupled with quantum machine learning (QML) based surrogate methods the computational burden can be alleviated such that QMC shows clear potential to undergird the formation of high quality descriptions across chemical space. We discuss three crucial approximations necessary to accomplish this: The fixed node approximation, universal and accurate references for chemical bond dissociation energies, and scalable minimal amons set based QML (AQML) models. Numerical evidence presented includes converged DMC results for over one thousand small organic molecules with up to 5 heavy atoms used as amons, and 50 medium sized organic molecules with 9 heavy atoms to validate the AQML predictions. Numerical evidence collected for $Δ$-AQML models suggests that already modestly sized QMC training data sets of amons suffice to predict total energies with near chemical accuracy throughout chemical space.