cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Determination of Magnetic Reconnections in a Low and a High Activity Year
Creators: name: Ojerheghan, Godfrey
name: Adimula, Isaac
Publisher: name: figshare
Year: 2021
Subjects: Plasma Physics

description: When there is a temporary disturbance of earth's magnetosphere, then a geomagnetic storm (or solar storm) has occurred. It is caused by a solar wind shock wave and/or cloud of a magnetic field that interacts with the Earth's magnetic fields. The interaction of Interplanetary Magnetic Fields (IMF) of the sun [1] with the earth's magnetic fields in opposite directions is known as magnetic reconnection. Magnetic reconnection (often referred as "reconnection") is the breaking and reconnecting of oppositely directed magnetic field lines in plasma at a neutral point which leads to converting the magnetic field energy into plasma kinetic and thermal energy. It occurs either in the daytime (day reconnection) where the sunward convection near the polar cusps allows energised particles to be transmitted earthward or night-time (tail reconnection) where particles are injected into the magnetosphere, thus releasing stored energy in the form of auroral substorms. A geostorm can be determined by changes in the Disturbance-storm time (Dst) Sokolov [2]. However not all geomagnetic storms have an initial phase and not all sudden increases in Dst Original Research Article Ojerheghan and Adimula; IAARJ, 2(4): 30-47, 2020; Article no.IAARJ.62999 31 or SYM-H are followed by a geomagnetic storm. This paper attempts to determine when the magnetic reconnection occurs in the solar cycle 24 considering a low activity year 2009 and a high activity year 2012. We analysed 39 and 202 geomagnetic storms in 2009 and 2012 respectively considering the Dst indices and IMF Bz values of each month obtained from the OMNIWeb database. Our results showed that storms were frequent and intense at high levels of solar activity due to the frequent occurrence of CMEs and ICMEs in the year 2012 than in the year 2009 which occurred in 10% and 45% of days in the year 2009 and 2012 respectively. This study also revealed that negative Bz occurrences were 47.54% and 52.18% of Bz occurrences in 2009 and 2012 respectively. Thus, the more intense the geostorms, the more Bz would go south and the more magnetic reconnection and subsequently auroral substorms which can increase radiation doses for occupants of transpolar flights, disruption of shortwave radio communications, distortion of compass readings in polar regions, failure of electrical transmission lines, increased corrosion in long pipelines, anomalies in the operations of communications satellites, and potentially lethal doses of radiation for astronauts in interplanetary spacecraft.
In situ formation of hot Jupiters with companion super-Earths
Creators: name: Poon, Sanson T. S.
name: Nelson, Richard P.
name: Coleman, Gavin A. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Observations have confirmed the existence of multiple-planet systems containing a hot Jupiter and smaller planetary companions. Examples include WASP-47, Kepler-730, and TOI-1130. We examine the plausibility of forming such systems in situ using $N$-body simulations that include a realistic treatment of collisions, an evolving protoplanetary disc and eccentricity/inclination damping of planetary embryos. Initial conditions are constructed using two different models for the core of the giant planet: a 'seed-model' and an 'equal-mass-model'. The former has a more massive protoplanet placed among multiple small embryos in a compact configuration. The latter consists only of equal-mass embryos. Simulations of the seed-model lead to the formation of systems containing a hot Jupiter and super-Earths. The evolution consistently follows four distinct phases: early giant impacts; runaway gas accretion onto the seed protoplanet; disc damping-dominated evolution of the embryos orbiting exterior to the giant; a late chaotic phase after dispersal of the gas disc. Approximately 1% of the equal-mass simulations form a giant and follow the same four-phase evolution. Synthetic transit observations of the equal-mass simulations provide an occurrence rate of 0.26% for systems containing a hot Jupiter and an inner super-Earth, similar to the 0.2% occurrence rate from actual transit surveys, but simulated hot Jupiters are rarely detected as single transiting planets, in disagreement with observations. A subset of our simulations form two close-in giants, similar to the WASP-148 system. The scenario explored here provides a viable pathway for forming systems with unusual architectures, but does not apply to the majority of hot Jupiters.
description: 19 pages, 18 figures, accepted for publication in MNRAS
Pion-Muon Asymmetry Revisited
Creators: name: Perkins, W. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Long ago an unexpected and unexplainable phenomena was observed. The distribution of muons from positive pion decay at rest was anisotropic with an excess in the backward direction relative to the direction of the proton beam from which the pions were created. Although this effect was observed by several different groups with pions produced by different means, the result was not accepted by the physics community, because it is in direct conflict with a large set of other experiments indicating that the pion is a pseudoscalar particle. It is possible to satisfy both sets of experiments if helicity-zero vector particles exist and the pion is such a particle. Helicity-zero vector particles have direction but no net spin. For the neutral pion to be a vector particle requires an additional modification to conventional theory as discussed herein. An experiment is proposed which can prove that the asymmetry in the distribution of muons from pion decay is a genuine physical effect because the asymmetry can be modified in a controllable manner. A positive result will also prove that the pion is NOT a pseudoscalar particle.
description: 9 pages, 3 figures
Classical Theory of Optical Nonlinearity in Conducting Nanoparticles
Creators: name: Panasyuk, George Y.
name: Schotland, John C.
name: Markel, Vadim A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We develop a classical theory of electron confinement in conducting nanoparticles. The theory is used to compute the nonlinear optical response of the nanoparticle to a harmonic external field.
description: Page margins have been adjusted; otherwise, identical to the previous version
title: Μελέτη χωροθέτησης μονάδας ανακύκλωσης πλαστικών απορριμμάτων & δημιουργίας eco-blocks στην ευρύτερη περιοχή της πόλης του Βόλου
titleType: AlternativeTitle
Creators: name: Parathyra, Nikolina
Publisher: name: National Technological University of Athens
Year: 2025
Subjects: Πλαστικά
Ανακύκλωση
Χωροθέτηση
Οικολογικά-τούβλα
Ανάπτυξη
Plastics
Recycle
Spatial-planning
Eco-bricks
Development

description: Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Περιβάλλον και Ανάπτυξη"
BRST Invariant Theory Of A Generalized 1+1 Dimensional Nonlinear Sigma Model With Topological Term
Creators: name: Huang, Yong-Chang
name: Yang, Kai-Hua
name: Lee, Xi-Guo
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We give a generalized Lagrangian density of 1+1 Dimensional O(3) nonlinear sigma model with subsidiary constraints, different Lagrange multiplier fields and topological term, find a lost intrinsic constraint condition, convert the subsidiary constraints into inner constraints in the nonlinear sigma model, give the example of not introducing the lost constraint, by comparing the example with the case of introducing the lost constraint, we obtain that when not introducing the lost constraint, one has to obtain a lot of various non-intrinsic constraints. We further deduce the gauge generator, give general BRST transformation of the model under the general conditions. It is discovered that there exists a gauge parameter originating from the freedom degree of BRST transformation in a general O(3) nonlinear sigma model, and we gain the general commutation relations of ghost field.
description: 8 pages
Preliminaries to a Psychological Model of Musical Groove
Creators: name: Senn, Olivier
name: Rose, Dawn
name: Bechtold, Toni Amadeus
name: Kilchenmann, Lorenz
name: Hoesl, Florian
name: Jerjen, Rafael
name: Baldassarre, Antonio
name: Alessandri, Elena
Publisher: name: Zenodo
Year: 2019

description: no abstract available
description: + ID der Publikation: hslu_60789 + Art des Beitrages: Wissenschaftliche Medien + Jahrgang: 10 + Sprache: Englisch + Letzte Aktualisierung: 2019-06-18 14:08:05
Neutrino-induced pion production from nuclei at medium energies
Creators: name: Praet, C.
name: Lalakulich, O.
name: Jachowicz, N.
name: Ryckebusch, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present a fully relativistic formalism for describing neutrino-induced $Δ$-mediated single-pion production from nuclei. We assess the ambiguities stemming from the $Δ$ interactions. Variations in the cross sections of over 10% are observed, depending on whether or not magnetic-dipole dominance is assumed to extract the vector form factors. These uncertainties have a direct impact on the accuracy with which the axial-vector form factors can be extracted. Different predictions for $C_5^A(Q^2)$ induce up to 40-50% effects on the $Δ$-production cross sections. To describe the nucleus, we turn to a relativistic plane-wave impulse approximation (RPWIA) using realistic bound-state wave functions derived in the Hartree approximation to the $σ$-$ω$ Walecka model. For neutrino energies larger than 1 GeV, we show that a relativistic Fermi-gas model with appropriate binding-energy correction produces comparable results as the RPWIA which naturally includes Fermi motion, nuclear-binding effects and the Pauli exclusion principle. Including $Δ$ medium modifications yields a 20 to 25% reduction of the RPWIA cross section. The model presented in this work can be naturally extended to include the effect of final-state interactions in a relativistic and quantum-mechanical way. Guided by recent neutrino-oscillation experiments, such as MiniBooNE and K2K, and future efforts like MINER$ν$A, we present $Q^2$, $W$, and various semi-inclusive distributions, both for a free nucleon and carbon, oxygen and iron targets.
description: 25 pages, 14 figures
Coulomb blockade in a Si channel gated by an Al single-electron transistor
Creators: name: Sun, L.
name: Brown, K. R.
name: Kane, B. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We incorporate an Al-AlO_x-Al single-electron transistor as the gate of a narrow (~100 nm) metal-oxide-semiconductor field-effect transistor (MOSFET). Near the MOSFET channel conductance threshold, we observe oscillations in the conductance associated with Coulomb blockade in the channel, revealing the formation of a Si single-electron transistor. Abrupt steps present in sweeps of the Al transistor conductance versus gate voltage are correlated with single-electron charging events in the Si transistor, and vice versa. Analysis of these correlations using a simple electrostatic model demonstrates that the two single-electron transistor islands are closely aligned, with an inter-island capacitance approximately equal to 1/3 of the total capacitance of the Si transistor island, indicating that the Si transistor is strongly coupled to the Al transistor.
description: 3 pages, 4 figures, 1 table; typos corrected, minor clarifications added; published in APL
Series impedance and shunt admittance matrices of an underground cable system
Creators: name: Navaratnam, Srivallipuranandan
Publisher: name: University of British Columbia
Year: 2010

description: This thesis describes numerical methods for the evaluation of the series impedance matrix and shunt admittance matrix of underground cable systems. In the series impedance matrix, the terms most difficult to compute are the internal impedances of tubular conductors and the earth return impedance. The various formulae for the internal impedance of tubular conductors and for the earth return impedance are, therefore, investigated in detail. Also, a more accurate way of evaluating the elements of the admittance matrix with frequency dependence of the complex permittivity is proposed. Various formulae have been developed for the earth return impedance of buried cables. Using the Pollaczek's formulae as the standard for comparison, the formula of Ametani and approximations proposed by other authors are studied. Mutual impedance between an underground cable and an overhead conductor is studied as well. The internal impedance of a laminated tubular conductor is different from that of a homogeneous tubular conductor. Equations have been derived to evaluate the internal impedances of such laminated tubular conductors.
Postural and muscular effects of different upper-limb movements on voicing: Pre-registration of confirmatory analyses
Creators: name: Pouw, Wim
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Social and Behavioral Sciences
subject: Life Sciences

description: This project page contains a timestamped pre-registration document "Postural and muscular effects of different upper-limb movements on voicing: Pre-registration of confirmatory analyses". The data supporting this pre-registration and power analyses are linked on the github (integrated as a module on this page).
The GALAH Survey: No chemical evidence of an extragalactic origin for the Nyx stream
Creators: name: Zucker, Daniel B.
name: Simpson, Jeffrey D.
name: Martell, Sarah L.
name: Lewis, Geraint F.
name: Casey, Andrew R.
name: Ting, Yuan-Sen
name: Horner, Jonathan
name: Nordlander, Thomas
name: Wyse, Rosemary F. G.
name: Zwitter, Tomaz
name: Bland-Hawthorn, Joss
name: Buder, Sven
name: Asplund, Martin
name: De Silva, Gayandhi M.
name: D'Orazi, Valentina
name: Freeman, Ken C.
name: Hayden, Michael R.
name: Kos, Janez
name: Lin, Jane
name: Lind, Karin
name: Schlesinger, Katharine J.
name: Sharma, Sanjib
name: Stello, Dennis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The results from the ESA Gaia astrometric mission and deep photometric surveys have revolutionized our knowledge of the Milky Way. There are many ongoing efforts to search these data for stellar substructure to find evidence of individual accretion events that built up the Milky Way and its halo. One of these newly identified features, called Nyx, was announced as an accreted stellar stream traveling in the plane of the disk. Using a combination of elemental abundances and stellar parameters from the GALAH and APOGEE surveys, we find that the abundances of the highest likelihood Nyx members are entirely consistent with membership of the thick disk, and inconsistent with a dwarf galaxy origin. We conclude that the postulated Nyx stream is most probably a high-velocity component of the Milky Way's thick disk. With the growing availability of large data sets including kinematics, stellar parameters, and detailed abundances, the probability of detecting chance associations increases, and hence new searches for substructure require confirmation across as many data dimensions as possible.
description: Accepted for publication by ApJ Letters
title: Επιφανειακή τροποποίηση πολυουρεθάνης για βελτιστοποίηση της βιοκαταλυτικής της αποικοδόμησης.
titleType: AlternativeTitle
Creators: name: Bousmpoura, Panagiota
Publisher: name: National Technological University of Athens
Year: 2025
Subjects: Πολυουρεθάνη

description: Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Επιστήμη και Τεχνολογία Υλικών”
Accuracy in Spreadsheet Modelling Systems
Creators: name: Grossman, Thomas A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Accuracy in spreadsheet modelling systems can be reduced due to difficulties with the inputs, the model itself, or the spreadsheet implementation of the model. When the "true" outputs from the system are unknowable, accuracy is evaluated subjectively. Less than perfect accuracy can be acceptable depending on the purpose of the model, problems with inputs, or resource constraints. Users build modelling systems iteratively, and choose to allocate limited resources to the inputs, the model, the spreadsheet implementation, and to employing the system for business analysis. When making these choices, users can suffer from expectation bias and diagnosis bias. Existing research results tend to focus on errors in the spreadsheet implementation. Because industry has tolerance for system inaccuracy, errors in spreadsheet implementations may not be a serious concern. Spreadsheet productivity may be of more interest.
description: 12 pages, 5 figures
Capital market equilibrium and differential information : an analytical and empirical investigation
Creators: name: Clarkson, Peter Mackay
Publisher: name: University of British Columbia
Year: 2010

description: This dissertation examines implications of models of differential information that formalize the following intuition: securities for which there is relatively little information are perceived as relatively more risky because of the higher uncertainty surrounding the exact parameters of their return distributions. The testable implications of the theoretical model depend on the nature of the assumed economy. In a small market setting we find that the presence of differential information will lead investors to make an upward adjustment to the measure of systematic risk that they employ for the pricing of low information securities relative to its measurement without regard for differential information. Further, the model predicts that the adjustment will decrease at a decreasing rate as information increases. Lastly, in the face of such an adjustment, the typical estimate of beta employed by researchers is found to be upwardly biased. On the other hand, the model predicts that the size of the adjustment to beta at each information level falls with the degree of positive cross-correlation between the low and high information securities, and the lack of cross-correlation in the information patterns for the low information securities. Thus, in unrestricted economies, where these sources of diversification are available, the presence of differential information should have little or no impact on market equilibrium. The implication that systematic risk (ft) for low information firms should decline as information increases is confirmed with three independent samples. First, a sample of 142 newly-listed firms is used to examine the relationship between systematic risk and time following the listing date. Next, a sample of 348 NYSE firms is employed to further explore this relationship. Finally, a sample of 140 newly-listed firms is used to examine the change in systematic risk at the time of the first annual earnings announcement. We also consider the suggestion that an association between information availability and both firm size and period of listing might provide a partial explanation for the firm size and period of listing anomalies. Our evidence suggests that this is unlikely where historical returns are used to estimate beta. Prior historical return associations tend to overstate beta at a point in time rather than understate it.
Inducing energy gaps in graphene monolayer and bilayer
Creators: name: Ribeiro, R. M.
name: Peres, N. M. R.
name: Coutinho, J.
name: Briddon, P. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this paper we propose a mechanism for the induction of energy gaps in the spectrum of graphene and its bilayer, when both these materials are covered with water and ammonia molecules. The energy gaps obtained are within the range 20-30 meV, values compatible to those found in experimental studies of graphene bilayer. We further show that the binding energies are large enough for the adsorption of the molecules to be maintained even at room temperature.
Mueller's Exchange-Correlation Energy in Density-Matrix-Functional Theory
Creators: name: Frank, Rupert L.
name: Lieb, Elliott H.
name: Seiringer, Robert
name: Siedentop, Heinz
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The increasing interest in the Mueller density-matrix-functional theory has led us to a systematic mathematical investigation of its properties. This functional is similar to the Hartree-Fock functional, but with a modified exchange term in which the square of the density matrix γ(X, X') is replaced by the square of γ^{1/2}(X, X'). After an extensive introductory discussion of density-matrix-functional theory we show, among other things, that this functional is convex (unlike the HF functional) and that energy minimizing γ's have unique densities ρ(x), which is a physically desirable property often absent in HF theory. We show that minimizers exist if N \leq Z, and derive various properties of the minimal energy and the corresponding minimizers. We also give a precise statement about the equation for the orbitals of γ, which is more complex than for HF theory. We state some open mathematical questions about the theory together with conjectured solutions.
description: Latex, 42 pages, 1 figure. Minor error in the proof of Prop. 2 corrected
Spectroscopy of horizontal branch stars in NGC6752 - Anomalous results on atmospheric parameters and masses
Creators: name: Bidin, C. Moni
name: Moehler, S.
name: Piotto, G.
name: Momany, Y.
name: Recio-Blanco, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We used the ESO VLT-FORS2 facility to collect low-resolution spectra of 51 targets distributed along the Horizontal Branch. We determined atmospheric parameters by comparison with theoretical models through standard fitting routines, and masses by basic equations. Results are in general in good agreement with previous works, although not always with theoretical expectations for cooler stars (Teff<15000 K). The calculated color excess is systematically lower than literature values, pointing towards a possible underestimation of effective temperatures. Moreover, we find two groups of stars at Teff=14000 K and at Teff=27000$ K that present anomalies with respect to the general trend and expectations. We suppose that the three peculiar bright stars at Teff=14000 K are probably affected by an enhanced stellar wind. For the eight Extreme Horizontal Branch stars at Teff=27000 K which show unusually high masses we find no plausible explanation. While most of our results agree well with the predictions of standard horizontal branch evolution, we still have problems with the low masses we derive in certain temperature ranges. We believe that Kurucz ATLAS9 LTE model atmospheres with solar-scaled abundances are probably inadequate for these temperature ranges. Concerning the group of anomalous stars at Teff=27000 K, a Kolmogorov-Smirnov test indicates that there is only an 8.4% probability that these stars are randomly drawn from the general distribution in the color-magnitude diagram. This is not conclusive but points out that these stars could be both (and independently) spectroscopically and photometrically peculiar with respect to the general Extreme Horizontal Branch population.
description: 12 pages, 10 figures, accepted for pubblication in A&A. Replaced for typos and better LaTeX output
แนวทางการพัฒนาศักยภาพการท่องเที่ยวและการมีส่วนร่วมของชุมชน เพื่อความสำเร็จของการจัดการท่องเที่ยวเชิงนิเวศวัฒนธรรม หมู่บ้านควายห้วยลำพอก ตำบลกุดหวาย อำเภอศีขรภูมิ จังหวัดสุรินทร์
Creators: name: ศิวาพร พยัคฆนันท์
Publisher: name: Program in Political Science, Faculty of Humanities and Social Sciences, Surindra Rajabhat University
Year: 2023
Subjects: การท่องเที่ยวเชิงนิเวศวัฒนธรรม
การมีส่วนร่วมของชุมชน
ศักยภาพการท่องเที่ยว

description: วารสารการบริหารการปกครองและนวัตกรรมท้องถิ่น, 7, 3, 191-212
Research Strategy and Scoping Survey on Spreadsheet Practices
Creators: name: Grossman, Thomas A.
name: Ozluk, Ozgur
Publisher: name: arXiv
Year: 2008
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: We propose a research strategy for creating and deploying prescriptive recommendations for spreadsheet practice. Empirical data on usage can be used to create a taxonomy of spreadsheet classes. Within each class, existing practices and ideal practices can he combined into proposed best practices for deployment. As a first step we propose a scoping survey to gather non-anecdotal data on spreadsheet usage. The scoping survey will interview people who develop spreadsheets. We will investigate the determinants of spreadsheet importance, identify current industry practices, and document existing standards for creation and use of spreadsheets. The survey will provide insight into user attributes, spreadsheet importance, and current practices. Results will be valuable in themselves, and will guide future empirical research.
description: 10 pages, 2 figures
การศึกษาผลสัมฤทธิ์ทางการเรียน เรื่องเรียนรู้เครื่องมือในโปรแกรมไมโครซอฟท์พาวเวอร์พอยต์ ของนักเรียนชั้นมัธยมศึกษาชั้นปีที่ 2 โรงเรียนขนาดมอญพิทยาคม โดยใช้สื่อเทคโนโลยีความจริงเสริม ร่วมกับวิธีการสอนแบบร่วมมือ
Creators: name: ณัฐธิดา เชิดโฉม
Publisher: name: Program in Political Science, Faculty of Humanities and Social Sciences, Surindra Rajabhat University
Year: 2023
Subjects: สื่อเทคโนโลยีความจริงเสริม
การสอนแบบร่วมมือ
โปรแกรมไมโครซอฟท์เพาเวอร์พอยต์

description: วารสารการบริหารการปกครองและนวัตกรรมท้องถิ่น, 7, 3, 213-226
title: Upgrade of a photovoltaic station to hybrid: Optimal sizing and operation of an electrical energy storage unit
title: Αναβάθμιση Φωτοβολταϊκού Σταθμού σε Υβριδικό: Βέλτιστη Διαστασιολόγηση και Λειτουργία Μονάδας Αποθήκευσης Ηλεκτρικής Ενέργειας
titleType: AlternativeTitle
Creators: name: Moschovitis, Andreas
Publisher: name: National Technological University of Athens
Year: 2025
Subjects: Συστήματα Αποθήκευσης Ηλεκτρικής Ενέργειας
Βέλτιστη Διαστασιολόγηση
Φωτοβολταϊκά Συστήματα
Υβριδικοί Σταθμοί
Ανανεώσιμες Πηγές Ενέργειας
Battery Energy Storage Systems
Optimal Sizing
Renewables
Hybrid Stations
Photovoltaic Plants

description: Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Παραγωγή και Διαχείριση Ενέργειας”
บทบาทของของชุมชนในกระบวนการส่งเสริมจัดการจัดทำแผนด้านสุขภาพในองค์การบริหารส่วนตำบลมะบ้า อำเภอทุ่งเขาหลวง จังหวัดร้อยเอ็ด
Creators: name: สุปัน สมสาร์
Publisher: name: Program in Political Science, Faculty of Humanities and Social Sciences, Surindra Rajabhat University
Year: 2023
Subjects: บทบาทของชุมชน
การจัดทำแผนด้านสุขภาพ
องค์การบริหารส่วนตำบล

description: วารสารการบริหารการปกครองและนวัตกรรมท้องถิ่น, 7, 3, 227-240
Boosting Algorithms: Regularization, Prediction and Model Fitting
Creators: name: Bühlmann, Peter
name: Hothorn, Torsten
Publisher: name: arXiv
Year: 2008
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: We present a statistical perspective on boosting. Special emphasis is given to estimating potentially complex parametric or nonparametric models, including generalized linear and additive models as well as regression models for survival analysis. Concepts of degrees of freedom and corresponding Akaike or Bayesian information criteria, particularly useful for regularization and variable selection in high-dimensional covariate spaces, are discussed as well. The practical aspects of boosting procedures for fitting statistical models are illustrated by means of the dedicated open-source software package mboost. This package implements functions which can be used for model fitting, prediction and variable selection. It is flexible, allowing for the implementation of new boosting algorithms optimizing user-specified loss functions.
description: This paper commented in: [arXiv:0804.2757], [arXiv:0804.2770]. Rejoinder in [arXiv:0804.2777]. Published in at http://dx.doi.org/10.1214/07-STS242 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Adaptive critical balance and firehose instability in an expanding, turbulent, collisionless plasma
Creators: name: Bott, A. F. A.
name: Arzamasskiy, L.
name: Kunz, M. W.
name: Quataert, E.
name: Squire, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Using hybrid-kinetic particle-in-cell simulation, we study the evolution of an expanding, collisionless, magnetized plasma in which strong Alfvénic turbulence is persistently driven. Temperature anisotropy generated adiabatically by the plasma expansion (and consequent decrease in the mean magnetic-field strength) gradually reduces the effective elasticity of the field lines, causing reductions in the linear frequency and residual energy of the Alfvénic fluctuations. In response, these fluctuations modify their interactions and spatial anisotropy to maintain a scale-by-scale "critical balance" between their characteristic linear and nonlinear frequencies. Eventually the plasma becomes unstable to kinetic firehose instabilities, which excite rapidly growing magnetic fluctuations at ion-Larmor scales. The consequent pitch-angle scattering of particles maintains the temperature anisotropy near marginal stability, even as the turbulent plasma continues to expand. The resulting evolution of parallel and perpendicular temperatures does not satisfy double-adiabatic conservation laws, but is described accurately by a simple model that includes anomalous scattering. Our results have implications for understanding the complex interplay between macro- and micro-scale physics in various hot, dilute, astrophysical plasmas, and offer predictions concerning power spectra, residual energy, ion-Larmor-scale spectral breaks, and non-Maxwellian features in ion distribution functions that may be tested by measurements taken in high-beta regions of the solar wind.
description: ApJL, in press. 9 pages, 5 figures
Electron Thermal Microscopy
Creators: name: Brintlinger, Todd
name: Qi, Yi
name: Baloch, Kamal H.
name: Goldhaber-Gordon, David
name: Cumings, John
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The progress of semiconductor electronics toward ever-smaller length scales and associated higher power densities brings a need for new high-resolution thermal microscopy techniques. Traditional thermal microscopy is performed by detecting infrared radiation with far-field optics, where the resolution is limited by the wavelength of the light. By adopting a serial, local-probe approach, near-field and scanned-probe microscopies can surpass this limit but sacrifice imaging speed. In the same way that electron microscopy was invented to overcome the resolution limits of light microscopy, we here demonstrate a thermal imaging technique that uses an electron microscope to overcome the limits of infrared thermal microscopy, without compromising imaging speed. With this new technique, which we call electron thermal microscopy, temperature is resolved by detecting the liquid-solid transition of arrays of nanoscale islands, producing thermal maps in real-time (30 thermal images per second over a 16um^2 field-of-view). The experimental demonstration is supported by combined electrical and thermal modeling.
description: 1 PDF file, incl. 17 pages manuscript plus 6 pages Supplementary Discussion v2: Add corresponding author asterisk and acknowledgement
QCD coupling below 1 GeV from quarkonium spectrum
Creators: name: Baldicchi, M.
name: Nesterenko, A. V.
name: Prosperi, G. M.
name: Simolo, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we extend the work synthetically presented in Ref.[1] and give theoretical details and complete tables of numerical results. We exploit calculations within a Bethe-Salpeter (BS) formalism adjusted for QCD, in order to extract an ``experimental'' strong coupling α_s^{exp}(Q^2) below 1 GeV by comparison with the meson spectrum. The BS potential follows from a proper ansatz on the Wilson loop to encode confinement and is the sum of a one-gluon-exchange and a confinement terms. Besides, the common perturbative strong coupling is replaced by the ghost-free expression α_E(Q^2) according to the prescription of Analytic Perturbation Theory (APT). The agreement of α_s^{exp}(Q^2) with the APT coupling α_E(Q^2) turns out to be reasonable from 1 GeV down to the 200 MeV scale, thus confirming quantitatively the validity of the APT prescription. Below this scale, the experimental points could give a hint on the vanishing of α_s(Q^2) as Q approaches zero. This infrared behaviour would be consistent with some lattice results and a ``massive'' generalization of the APT approach. As a main result, we claim that the combined BS-APT theoretical scheme provides us with a rather satisfactory correlated understanding of very high and rather low energy phenomena from few hundreds MeV to few hundreds GeV.
description: Preliminary revision. Typos corrected, comments and references added
A New Estimate of the Best Value for the Solar Galactocentric Distance
Creators: name: Bobylev, V. V.
name: Bajkova, A. T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using data from the literature, we made a list of individual estimates of the solar Galactocentric distance, which were performed after 2017 by different methods. These values have not yet been used to calculate the best value of mean $R_0$. For the sample containing 21 estimates, based on the standard approach, we found the weighted mean ${\overline R_0}=8.14$ kpc with the dispersion $σ=0.16$ kpc, and using the median statistics, we obtained the estimate $R_0=8.15\pm0.11$ kpc. For practical use, the value $R_0=8.1\pm0.1$ kpc can be recommended.
description: 12 pages, 3 figures, 4 tables
New Guidelines For Spreadsheets
Creators: name: Raffensperger, John F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: Current prescriptions for spreadsheet style specify modular separation of data, calcu1ation and output, based on the notion that writing a spreadsheet is like writing a computer program. Instead of a computer programming style, this article examines rules of style for text, graphics, and mathematics. Much 'common wisdom' in spreadsheets contradicts rules for these well-developed arts. A case is made here for a new style for spreadsheets that emphasises readability. The new style is described in detail with an example, and contrasted with the programming style.
description: 16 pages, 5 figures, 1 table
Topological degeneracy and vortex manipulation in Kitaev's honeycomb model
Creators: name: Kells, G.
name: Bolukbasi, A. T.
name: Lahtinen, V.
name: Slingerland, J. K.
name: Pachos, J. K.
name: Vala, J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The classification of loop symmetries in Kitaev's honeycomb lattice model provides a natural framework to study the abelian topological degeneracy. We derive a perturbative low-energy effective Hamiltonian, that is valid to all orders of the expansion and for all possible toroidal configurations. Using this form we demonstrate at what order the system's topological degeneracy is lifted by finite size effects and note that in the thermodynamic limit it is robust to all orders. Further, we demonstrate that the loop symmetries themselves correspond to the creation, propagation and annihilation of fermions. Importantly, we note that these fermions, made from pairs of vortices, can be moved with no additional energy cost.
description: 4 pages, 3 figures, Revised version, accepted to PRL
The New Role of Javanese Traditional Performing Arts: A Case Study of Educational and Socially Transformative Gamelan Music Programs in Prisons
Creators: name: Okado, Kaori
Publisher: name: Faculty of Fine and Applied Arts, Chulalongkorn University
Year: 2012
Subjects: Gamelan, Prison, Social Transformation, Music Education, New Value of Traditional Performing Arts

description: -, 5, Journal of Urban Culture Research
แนวทางการพัฒนาประสิทธิภาพการให้บริการประชาชนขององค์การบริหารส่วนตำบลห้วยขมิ้น อำเภอด่านช้าง จังหวัดสุพรรณบุรี
Creators: name: พัชราภรณ์ โล่ห์นารายณ์
Publisher: name: Program in Political Science, Faculty of Humanities and Social Sciences, Surindra Rajabhat University
Year: 2023
Subjects: การพัฒนาประสิทธิภาพ
การให้บริการ
องค์การบริหารส่วนตำบล

description: วารสารการบริหารการปกครองและนวัตกรรมท้องถิ่น, 7, 3, 241-256
title: A New Simulation Tool for the Predictive Assessment of Fluidized and Circulatory Granular Flow Behaviour
Creators: name: Lopez Marrero, A
Publisher: name: Liverpool John Moores University
Year: 2020

description: The Mass Finishing (MF) technologies are an area within the manufacturing processes that have been poorly investigated. The flow behaviour of the media within the work chamber is complex to establish. Deriving predictive process models or developing strategies for optimisation remains challenging. This is mainly because of the difficulty of measuring the phenomenon without altering it. Thus, there are many unanswered questions concerning the efficiency and capability of the MF technologies and uncertainty concerning the actions by which to optimise these processes. The work presented in this thesis employs a numerical approach, the Discrete Element Method (DEM) to shed light on these matters. This method has successfully revealed the mechanisms of the media flow within the rotary disc finisher and the importance of the friction between the container and the media. Furthermore, an in depth analysis of the interaction between particles and a fixed specimen within the bulk was achieved. This analysis predicts the behaviour of the stresses beyond the surfaces of the specimen and what features of the specimen are more likely to be affected by the media impact. Moreover, a full defined set of experiment is discussed as a means to obtain all the mechanical properties involve in the DEM model. A complete study of the movement governing the vibratory trough is also presented on this thesis.
Rejection of Smooth GPS Time Synchronization Attacks via Sparse Techniques
Creators: name: Schmidt, Erick
name: Lee, Junhwan
name: Gatsis, Nikolaos
name: Akopian, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents a novel time synchronization attack (TSA) model for the Global Positioning System (GPS) based on clock data behavior changes in a higher-order derivative domain. Further, the time synchronization attack rejection and mitigation based on sparse domain (TSARM-S) is presented. TSAs affect stationary GPS receivers in applications where precise timing is required, such as cellular communications, financial transactions, and monitoring of the electric power grid. In the present work, the clock bias and clock drift are monitored at higher-order clock data derivatives where the TSA is seen as a sparse spike-like event. The smoothness of the attack relates to the derivative order where the sparsity is observed. The proposed method jointly estimates a dynamic solution for GPS timing and rejects behavior changes based on such sparse events. An evaluation procedure is presented for two testbeds, namely a commercial receiver and a software-defined radio. Further, the proposed method is evaluated against distinct real-dataset Texas Spoofing Test Battery (TEXBAT) scenarios. Combined synthetic and real-data results show an average RMS clock bias error of 12.08 m for the SDR platform, and 45.74 m for the commercial device. Further, the technique is evaluated against state-of-the-art mitigation techniques and in a spoofing-plus-multipath scenario for robustness. Finally, TSARM-S can be potentially optimized and implemented in commercial devices via a firmware upgrade.
description: IEEE Sensors Journal ( Volume: 21, Issue: 1, Jan.1, 1 2021)
Chemical Complexity in Galaxies
Creators: name: Turner, Jean L.
name: Meier, David S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: ALMA will be able to detect a broad spectrum of molecular lines in galaxies. Current aperture synthesis observations indicate that the molecular line emission from galaxies is remarkably variable, even on kpc scales. Imaging spectroscopy at resolutions of an arcsecond or better will reduce the chemical complexity by allowing regions of physical conditions to be defined and classified.
description: to appear in Astrophysics and Space Science, proceedings of the international conference Science with ALMA: a new era for Astrophysics 2006
When, why and how to test spreadsheets
Creators: name: Pryor, Louise
Publisher: name: arXiv
Year: 2008
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Testing is a vital part of software development, and spreadsheets are like any other software in this respect. This paper discusses the testing of spreadsheets in the light of one practitioner's experience. It considers the concept of software testing and how it differs from reviewing, and describes when it might take place. Different types of testing are described, and some techniques for performing them presented. Some of the commonly encountered problems are discussed.
description: 7 pages, 5 colour figures
Equilibrium organization, conformation, and dynamics of two polymers under box-like confinement
Creators: name: Polson, James M.
name: Rehel, Desiree A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Motivated by recent nanofluidics experiments, we use Brownian dynamics and Monte Carlo simulations to study the conformation, organization and dynamics of two polymer chains confined to a single box-like cavity. The polymers are modeled as flexible hard-sphere chains, and the box has a square cross-section of side length $L$ and a height that is small enough to compress the polymers in that dimension. For sufficiently large $L$, the system behaviour approaches that of an isolated polymer in a slit. However, the combined effects of crowding and confinement on the polymer organization, conformation and equilibrium dynamics become significant when $L/R_{{\rm g},xy}^*\lesssim 5$, where $R_{{\rm g},xy}^*$ is the transverse radius of gyration for a slit geometry. In this regime, the centre-of-mass probability distribution in the transverse plane exhibits a depletion zone near the centre of the cavity (except at very small $L$) and a 4-fold symmetry with quasi-discrete positions. Reduction in polymer size with decreasing $L$ arises principally from confinement rather than inter-polymer crowding. By contrast, polymer diffusion and internal motion are strongly affected by inter-polymer crowding. The two polymers tend to occupy opposite positions relative to the box centre, about which they diffuse relatively freely. Qualitatively, this static and dynamical behaviour differs significantly from that previously observed for confinement of two polymers to a narrow channel. The simulation results for a suitably chosen box width are qualitatively consistent with results from a recent experimental study of two $λ$-DNA chains confined to a nanofluidic cavity.
description: 14 pages, 9 figures
Re-emergence of North Atlantic subsurface ocean temperature anomalies in a seasonal forecast system
Creators: name: Grist, J. P.
name: Sinha, B
name: Hewitt, H. T.
name: Duchez, A.
name: MacLachlan, C.
name: Hyder, P.
name: Josey, S. A.
name: Hirschi, J. J.-M.
name: Blaker, A. T.
name: New, A. L.
name: Scaife, A. A.
name: Roberts, C. D.
Publisher: name: Zenodo
Year: 2019

description: Abstract of presentation given at the Workshop on Climate Prediction in the Atlantic-Arctic sector, Bergen, 5-7 June 2019.
Global counterfactual exlanations: Efficient coputation and bias auditing
Creators: name: Tsopelas, Konstantinos
Publisher: name: National Technological University of Athens
Year: 2025
Subjects: Μηχανική μάθηση
Επεξηγησιμότητα
Δικαιοσύνη
Δικαιοπραξία
Explainability
Fairness
Recourse
Machine learning
Global counterfactual explanations
Καθολικές αντιθετικές εξηγήσεις

description: Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) "Επιστήμη Δεδομένων και Μηχανική Μάθηση"
title: Οι επιπτώσεις του πληθωρισμού και του δείκτη ανεργίας στη Χρηματοαγορά της Γερμανίας
titleType: AlternativeTitle
Creators: name: Malevitis, Nikolaos
Publisher: name: National Technological University of Athens
Year: 2025
Subjects: Χρηματιστήριο
Γραμμική Παλινδρόμηση
Μακροοικονομικές Μεταβλητές
Ανεργίας
Stock Market
Πληθωρισμός
Variables
Macroeconomic
Unemployment
Inflation

description: Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Μαθηματική Προτυποποίηση σε Σύγχρονες Τεχνολογίες και στα Χρηματοοικονομικά”
On gravitational defects, particles and strings
Creators: name: Fairbairn, Winston J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the inclusion of point and string matter in the deSitter gauge theory, or MacDowell-Mansouri formulation of four dimensional gravity. We proceed by locally breaking the gauge symmetries of general relativity along worldlines and worldsheets embedded in the spacetime manifold. Restoring full gauge invariance introduces new dynamical fields which describe the dynamics of spinning matter coupled to gravity. We discuss the physical interpretation of the obtained formalism by studying the flat limit and the spinless case on arbitrary backgrounds. It turns out that the worldline action describes a massive spinning particle, while the worldsheet action contains the Nambu-Goto string augmented with spinning contributions. Finally, we study the gravity/matter variational problem and conclude by discussing potential applications of the formalism to the inclusion of the Nambu-Goto string in spinfoam models of four dimensional quantum gravity.
description: 30 pages, no figures