cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Adaptive Resolution Simulation of Liquid Water
Creators: name: Praprotnik, Matej
name: Site, Luigi Delle
name: Kremer, Kurt
name: Matysiak, Silvina
name: Clementi, Cecilia
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present a multiscale simulation of liquid water where a spatially adaptive molecular resolution procedure allows for changing on-the-fly from a coarse-grained to an all-atom representation. We show that this approach leads to the correct description of all essential thermodynamic and structural properties of liquid water.
description: 4 pages, 3 figures; changed figure 2
Merged white dwarfs and nucleosynthesis
Creators: name: Jeffery, Simon
name: Zhang, Xianfei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Orbital decay mechanisms argue that double white dwarf mergers are inevitable, but extremely rare. Whilst some mergers result in explosions, the survivors re-ignite helium and burn brightly for tens of thousands or millions of years. Candidate survivors include extreme helium stars, R CrB variables and various classes of helium-rich subluminous star. Nuclear waste on the survivors' surfaces provides evidence of the stars' nuclear history prior to and their nucleosynthesis during the merger. Extensive and deep spectroscopic surveys offer rich prospects for future discoveries.
description: Originally presented at the conference '150 Years of the Periodic Table' held in Bengaluru, India, in 2019, December, and to appear in Journal of Astrophysics and Astronomy. 11 pages, 5 figures
High precision half-life measurement of $^{95}$Ru, $^{95}$Tc and $^{95m}$Tc with $γ$-spectroscopy
Creators: name: Szegedi, T. N.
name: Tóth, Á.
name: Kiss, G. G.
name: gyürky, Gy.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The precise knowledge of the half-life of the reaction product is of crucial importance for a nuclear reaction cross section measurement carried out with the activation technique. The cross section of the $^{92}$Mo($α$,n)$^{95}$Ru reaction was measured recently using this experimental approach. The preliminary results indicated that the literature half-life of $^{95}$Ru, derived about half a century ago, is overestimated. Therefore, the half-lives of $^{95}$Ru and its daughter isotope $^{95}$Tc and $^{95m}$Tc have been measured with high precision using $γ$-spectroscopy. The results are t$_{1/2}$=1.6033 $\pm$ 0.0044 h for $^{95}$Ru, t$_{1/2}$ = 19.258 $\pm$ 0.026 h for $^{95}$Tc and t$_{1/2}$ = 61.96 $\pm$ 0.24 d for $^{95m}$Tc. The precision of the half-life values has been increased, consequently the recently measured $^{92}$Mo($α$,n)$^{95}$Ru activation cross section will become more precise.
Visual Photometry: Testing Hypotheses Concerning Bias and Precision
Creators: name: Whiting, Alan B.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Visual photometry, the estimation of stellar brightness by eye, continues to provide valuable data even in this highly-instrumented era. However, the eye-brain system functions differently from electronic sensors and its products can be expected to have different characteristics. Here I characterize some aspects of the visual data set by examining ten well-observed variable stars from the AAVSO database. The standard deviation around a best-fit curve ranges from 0.14 to 0.34 magnitude, smaller than most previous estimates. The difference in scatter between stars is significant, but does not correlate with such things as range or quickness of variation, or even with color. Naked-eye variables, which would be expected to be more difficult to observe accurately, in fact show the smallest scatter. The difference between observers (bias) is less important than each observer's internal precision. A given observer's precision is not set but varies from star to star for unknown reasons. I note some results relevant to other citizen science projects.
description: 20 pages, 107 figures. Copyright 2023 by the American Association of Variable Star Observers. All rights reserved
Simulation-Assisted Decorrelation for Resonant Anomaly Detection
Creators: name: Benkendorfer, Kees
name: Pottier, Luc Le
name: Nachman, Benjamin
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Machine Learning (stat.ML)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: A growing number of weak- and unsupervised machine learning approaches to anomaly detection are being proposed to significantly extend the search program at the Large Hadron Collider and elsewhere. One of the prototypical examples for these methods is the search for resonant new physics, where a bump hunt can be performed in an invariant mass spectrum. A significant challenge to methods that rely entirely on data is that they are susceptible to sculpting artificial bumps from the dependence of the machine learning classifier on the invariant mass. We explore two solutions to this challenge by minimally incorporating simulation into the learning. In particular, we study the robustness of Simulation Assisted Likelihood-free Anomaly Detection (SALAD) to correlations between the classifier and the invariant mass. Next, we propose a new approach that only uses the simulation for decorrelation but the Classification without Labels (CWoLa) approach for achieving signal sensitivity. Both methods are compared using a full background fit analysis on simulated data from the LHC Olympics and are robust to correlations in the data.
description: 17 pages, 7 figures
Laminated Wave Turbulence: Generic Algorithms III
Creators: name: Kartashova, Elena
name: Kartashov, Alexey
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Model of laminated wave turbulence allows to study statistical and discrete layers of turbulence in the frame of the same model. Statistical layer is described by Zakharov-Kolmogorov energy spectra in the case of irrational enough dispersion function. Discrete layer is covered by some system(s) of Diophantine equations while their form is determined by wave dispersion function. This presents a very special computational challenge - to solve Diophantine equations in many variables, usually 6 to 8, in high degrees, say 16, in integers of order $10^{16}$ and more. Generic algorithms for solving this problem in the case of {\it irrational} dispersion function have been presented in our previous papers. In this paper we present a new generic algorithm for the case of {\it rational} dispersion functions. Special importance of this case is due to the fact that in wave systems with rational dispersion the statistical layer does not exist and the general energy transport is governed by the discrete layer alone.
description: submitted to IJMPC
Διαφορές στο ιδανικό ύψος πτώσης στα άλματα με πτώση μεταξύ απροπόνητων προέφηβων αγοριών και κοριτσιών και προέφηβων αθλητών/τριων κλασικού αθλητισμού:
Creators: name: Παναγιωτίδου, Αικατερίνη Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Αλμα από ημικάθισμα
Αλμα με προδιάταση
Αλμα μετά από πτώση από κάποιο ύψος
Squat jump
Countermovement jump
Drop jump

description: Ο σκοπός της παρούσας μελέτης ήταν να εξεταστεί η επίδραση του φύλου και της προπόνησης στο ιδανικό ύψος πτώσης στα άλματα μετά από πτώση μεταξύ προέφηβων αγοριών και κοριτσιών εννιά έως έντεκα ετών. Τριάντα απροπόνητα αγόρια και κορίτσια και τριάντα αγόρια και κορίτσια του κλασικού αθλητισμού, συμμετείχαν εθελοντικά στη διεξαγωγή της έρευνας. Οι εξεταζόμενοι εκτέλεσαν τρία άλματα από ημικάθισμα, τρία άλματα με προδιάταση και τρία άλματα μετά από πτώση από δέκα, είκοσι, τριάντα, σαράντα και πενήντα εκατοστά. Για την μέτρηση των αλμάτων χρησιμοποιήθηκε ο φορητός ηλεκτρονικός τάπητας. Όλα τα άλματα πραγματοποιήθηκαν με τυχαία σειρά. Από κάθε είδος άλματος επιλέχθηκε η καλύτερη προσπάθεια και χρησιμοποιήθηκε για στατιστική ανάλυση. Για τη στατιστική ανάλυση χρησιμοποιήθηκε ανάλυση διακύμανσης με επαναλαμβανόμενες μετρήσεις. Τα αποτελέσματα έδειξαν ότι ο τύπος άλματος είχε σημαντική επίδραση στο ύψος αναπήδησης. Το ύψος άλματος κατά το άλμα με προδιάταση ήταν υψηλότερο σε σύγκριση με τους άλλους τύπους άλματος. Τα προπονημένα παιδιά παρουσίασαν υψηλότερο άλμα από τα απροπόνητα. Σύμφωνα με τα παρόντα αποτελέσματα, η αύξηση του ύψους πτώσης δεν αύξησε το ύψος αναπήδησης κατά τα άλματα μετά από πτώση. Αυτό ενδεχομένως δείχνει μια ανικανότητα των προέφηβων παιδιών, αθλούμενων και μη, να χρησιμοποιούν την αποθηκευμένη ελαστική τους ενέργεια, έτσι ώστε να βελτιώσουν την αλτική τους απόδοση κατά τη διάρκεια του άλματος μετά από πτώση, ανεξάρτητα από το φύλο ή την προπονητική τους κατάρτιση.
description: The purpose of this study was to examine the effect of gender and training background on the optimal drop jump height of prepubertal subjects nine to eleven years of age. Thirty untrained and thirty track and field prepubescents, equally distributed in males and females (fifteen for each group), volunteered to participate. They performed in random order three squat jumps, three counter movement jumps and three drop jumps from ten, twenty, thirty, forty and fifty cm on Ergo Jump Bosco. The trial with the best performance in jump height of each test was used for further analysis. The jump type affected significantly the jump height. Jump height during counter movement jumps was the highest among all other jump types. Athletes jumped higher than non athletes. According to the current results, increasing the dropping height did not increase the jumping height during drop jump. However, motor tendon unit loading in counter movement jumps resulted in advanced performance for both trained and untrained prepubertal boys and girls. This possibly indicates an inability of prepubertal trained and untrained children to use their stored elastic energy to increase jumping height during drop jump, irrespective of their gender or training status.
Hydrogen phosphate-mediated acellular biomineralisation within a dual crosslinked hyaluronic acid hydrogel
Creators: name: Gao, Ziyu
name: Hassouneh, Layla
name: Yang, Xuebin
name: Pang, Juan
name: Thornton, Paul D.
name: Tronci, Giuseppe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: The creation of hyaluronic acid (HA)-based materials as biomineralisation scaffolds for cost-effective hard tissue regenerative therapies remains a key biomedical challenge. A non-toxic and simple acellular method to generate specific hydrogen phosphate interactions within the polymer network of cystamine-crosslinked HA hydrogels is reported. Reinforced dual crosslinked hydrogel networks were accomplished after 4-week incubation in disodium phosphate-supplemented solutions that notably enabled the mineralisation of hydroxyapatite (HAp) crystals across the entire hydrogel structure. Hydrogen phosphate-cystamine crosslinked HA hydrogen bond interactions were confirmed by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and density functional theory (DFT) calculations. Hydrogen phosphate-mediated physical crosslinks proved to serve as a first nucleation step for acellular hydrogel mineralisation in simulated body fluid allowing HAp crystals to be detected by X-ray powder diffraction (2θ = 27°, 33° and 35°) and visualised with density gradient across the entire hydrogel network. On a cellular level, the presence of aggregated structures proved key to inducing ATDC 5 cell migration whilst no toxic response was observed after 3-week culture. This mild and facile ion-mediated stabilisation of HA-based hydrogels has significant potential for accelerated hard tissue repair in vivo and provides a new perspective in the design of dual crosslinked mechanically competent hydrogels.
Low-Energy Inelastic Neutrino Reactions on 4He
Creators: name: Gazit, Doron
name: Barnea, Nir
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The inelastic scattering of neutrino off 4He is calculated microscopically at energies typical for core collapse supernova environment. The calculation is carried out with the Argonne V18 nucleon--nucleon potential and the Urbana IX three nucleon force. Full final state interaction is included via the Lorentz integral transform (LIT) method. The contribution of axial meson exchange currents to the cross sections is taken into account from effective field theory of nucleons and pions to order O(Q^3).
description: 5 pages, 1 figure, corrected typos and added reference, submitted to Phys. Rev. Lett
Power spectrum and form factor in random diagonal matrices and integrable billiards
Creators: name: Riser, Roman
name: Kanzieper, Eugene
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Triggered by a controversy surrounding a universal behaviour of the power spectrum in quantum systems exhibiting regular classical dynamics, we focus on a model of random diagonal matrices (RDM), often associated with the Poisson spectral universality class, and examine how the power spectrum and the form factor get affected by two-sided truncations of RDM spectra. Having developed a nonperturbative description of both statistics, we perform their detailed asymptotic analysis to demonstrate explicitly how a traditional assumption (lying at the heart of the controversy) -- that the power spectrum is merely determined by the spectral form factor -- breaks down for truncated spectra. This observation has important consequences as we further argue that bounded quantum systems with integrable classical dynamics are described by heavily truncated rather than complete RDM spectra. High-precision numerical simulations of semicircular and irrational rectangular billiards lend independent support to these conclusions.
description: 40 pages, 8 figures
Large Coadjoint representation of Virasoro-type Lie algebras and differential operators on tensor-densities
Creators: name: Ovsienko, Valentin
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We discuss the geometrical nature of the coadjoint representation of the Virasoro algebra and some of its generalizations. The isomorphism of the coadjoint representation of the Virasoro group to the $Diff(S^1)$-action on the space of Sturm-Liouville operators was discovered by A.A. Kirillov and G. Segal. This deep and fruitful result relates this topic to the classical problems of projective differential geometry (linear differential operators, projective structures on $S^1$ etc.) The purpose of this talk is to give a detailed explanation of the A.A. Kirillov method [14] for the geometric realization of the coadjoint representation in terms of linear differential operators. Kirillovś method is based on Lie superalgebras generalizing the Virasoro algebra. One obtains the Sturm-Liouville operators directly from the coadjoint representation of these Lie superalgebras. We will show that this method is universal. We will consider a few examples of infinite-dimensional Lie algebras and show that the Kirillov method can be applied to them. This talk is purely expository: all the results are known.
Management και ολοκληρωμένη διαχείριση σε χοιροτροφικές μονάδες της Βόρειας Ελλάδας:
Creators: name: Τερζίδης, Γεώργιος Παύλου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Ολοκληρωμένη διαχείριση
Χοιροτροφία
Πιστοποίηση
Integrated management
Agro-3

description: Οι πρόσφατες εξελίξεις στην αγορά των τροφίμων επέβαλλαν την εφαρμογή των συστημάτων ποιότητας στη γεωργία και στην κτηνοτροφία. Στην εποχή μας, τα προϊόντα που έχουν καλή προοπτική να παραμείνουν στην αγορά, είναι αυτά που εγγυώνται για την ασφάλεια και την ποιότητά τους, μέσω ενός σήματος πιστοποίησης. Μια τέτοια προοπτική, για την ελληνική χοιροτροφία, απορρέει από το πρότυπο Agro 3 («Σύστημα Διαχείρισης για τη Διασφάλιση της Ποιότητας του Χοιρινού Κρέατος», του AGROCERT – ΟΠΕΓΕΠ), στο οποίο προσδιορίζονται οι απαιτήσεις που καλύπτουν την κείμενη νομοθεσία, με ορισμένες επιπρόσθετες, οι οποίες δημιουργούν τις προϋποθέσεις παραγωγής ενός προϊόντος (χοιρινό κρέας) που δεν είναι γενικά και αόριστα «ελληνικό χοιρινό κρέας» αλλά «ελληνικό χοιρινό κρέας, ολοκληρωμένης διαχείρισης και πιστοποιημένης ποιότητας». Στην έρευνα αυτή, διερευνάται η εφαρμογή του management σε μονάδες που αποφάσισαν να εφαρμόσουν την ολοκληρωμένη διαχείριση βάσει του προτύπου Agro 3.
description: The recent development in the food market imposed the application of quality systems in agriculture and in animal production. Nowadays, the products that have good prospects to remain in the market are those that ensure the safety and quality through a certification mark. Agro 3 standard provides that perspective of development for the Greek pork production («Management System for Pig Meat Quality Systems» of AGROCERT - OPEGEP) since it defines the prerequisites of the national law which determine requirements and rules ensuring hygiene and safety from animal feed production to pork meat packaging. The aforementioned prerequisite also identifies the requirements that create the conditions for producing a product (pork), that is not in general and vague "Greek pork" but "Greek pork, of integrated management and certified quality".In this research, the investigation is about the application of management in pork farms that decided to implement an integrated management based on the Agro 3 standard.
OGHReS: Star formation in the Outer Galaxy ($\ell = 250^\circ$-$280^\circ$)
Creators: name: Urquhart, J. S.
name: König, C.
name: Colombo, D.
name: Karska, A.
name: Wyrowski, F.
name: Menten, K. M.
name: Moore, T. J. T.
name: Brand, J.
name: Elia, D.
name: Giannetti, A.
name: Leurini, S.
name: Figueira, M.
name: Lee, M. -Y.
name: Dumke, M.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have used data from the Outer Galaxy High-Resolution Survey (OGHReS) to refine the velocities, distances, and physical properties of a large sample of 3584 clumps detected in far infrared/submillimetre emission in the HiGAL survey located in the $\ell = 250^\circ-280^\circ$ region of the Galactic plane. Using $^{12}$CO and $^{13}$CO spectra, we have determined reliable velocities to 3412 clumps (95% of the sample). In comparison to the velocities from the HiGAL catalogue, we find good agreement for 80% of the sample (within 5 km/s). Using the higher resolution and sensitivity of OGHReS has allowed us to correct the velocity for 632 clumps and provide velocities for 687 clumps for which no velocity had been previously allocated. The velocities are used with a rotation curve to refine the distances to the clumps and to calculate the clumps' properties using a distance-dependent gas-to-dust ratio. We have determined reliable physical parameters for 3200 outer Galaxy dense clumps (~90% of the HiGAL sources in the region). We find a trend of decreasing luminosity-to-mass ratio with increasing Galactocentric distance, suggesting the star formation efficiency is lower in the outer Galaxy or that it is resulting in more lower mass stars than in the inner Galaxy. We also find a similar surface density for protostellar clumps located in the inner and outer Galaxy, revealing that the surface density requirements for star formation are the same across the Galactic disc.
description: 15 pages, 13 figures. Accepted for publication by MNRAS
Weak antilocalization beyond the fully diffusive regime in Pb1-xSnxSe topological quantum wells
Creators: name: Wang, Jiashu
name: Liu, X.
name: Bunker, C.
name: Riney, L.
name: Qing, B.
name: Bac, S. K.
name: Zhukovskyi, M.
name: Orlova, T.
name: Rouvimov, S.
name: Dobrowolska, M.
name: Furdyna, J. K.
name: Assaf, B. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report the measurements and analysis of weak antilocalization (WAL) in Pb1-xSnxSe topological quantum wells in a new regime where the elastic scattering length is larger than the magnetic length. We achieve this regime through the development of high-quality epitaxy and doping of topological crystalline insulator (TCI) quantum wells. We obtain elastic scattering lengths that exceeds 100nm and become comparable to the magnetic length. In this transport regime, the Hikami-Larkin-Nagaoka model is no longer valid. We employ the model of Wittmann and Schmid to extract the coherence time from the magnetoresistance. We find that despite our improved transport characteristics, the coherence time may be limited by scattering channels that are not strongly carrier dependent, such as electron-phonon or defect scattering.
description: Accepted PRB
The uniform Korn - Poincaré inequality in thin domains
Creators: name: Lewicka, Marta
name: Müller, Stefan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 74B05

description: We study the Korn-Poincaré inequality: \|u\|_{W^{1,2}(S^h)} < C_h \|D(u)\|_{L^2(S^h)}, in domains S^h that are shells of small thickness of order h, around an arbitrary smooth and closed hypersurface S in R^n. By D(u) we denote the symmetric part of the gradient \nabla u, and we assume the tangential boundary conditions: u\vec n^h = 0 on \partial S^h. We prove that C_h remains uniformly bounded as h tends to 0, for vector fields u in any family of cones (with angle
description: 30 pages, 1 figure
An existence result for the fractional Kelvin-Voigt's model on time-dependent cracked domains
Creators: name: Caponi, Maicol
name: Sapio, Francesco
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35L53, 35R11, 35A01, 35Q74, 74H20, 74R10

description: We prove an existence result for the fractional Kelvin-Voigt's model involving Caputo's derivative on time-dependent cracked domains. We first show the existence of a solution to a regularized version of this problem. Then, we use a compactness argument to derive that the fractional Kelvin-Voigt's model admits a solution which satisfies an energy-dissipation inequality. Finally, we prove that when the crack is not moving, the solution is unique.
Coupling dynamical and collisional evolution of small bodies II : Forming the Kuiper Belt, the Scattered Disk and the Oort Cloud
Creators: name: Morbidelli, S. Charnoz A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The Oort Cloud, the Kuiper Belt and the Scattered Disk are dynamically distinct populations of small bodies evolving in the outer regions of the Solar System. Whereas their collisional activity is now quiet, gravitational interactions with giant planets may have shaped these populations both dynamically and collisionally during their formation. Using a hybrid approach (Charnoz & Morbidelli 2003), the present paper tries to couple the primordial collisional and dynamical evolution of these three populations in a self-consistent way. A critical parameter is the primordial size-distribution. We show that the initial planetesimal size distribution that allows an effective mass depletion of the Kuiper belt by collisional grinding, would decimate also the population of comet-size bodies that end in the Oort Cloud and, in particular, in the Scattered Disk. As a consequence, the Scattered Disk and the Oort Cloud would be too anemic, by a factor 20 to 100, relative to the estimates achieved from the observation of the fluxes of long period and Jupiter family comets, respectively. For these two reservoirs to have a sufficient number of comets, the initial size distribution in the planetesimal disk had to be such that the mass depletion by collisional erosion of in the Kuiper belt was negligible. Consequently, the current mass deficit of the Kuiper belt, needs to be explained by dynamical mechanisms.
description: Accepted in ICARUS with minr modifications. 47 pages, 11 figures
Dynamics of Freely Suspended Drops Translating through Miscible Environments
Creators: name: Mossige, Endre Joachim
name: Suja, Vinny Chandran
name: Walls, Daniel J.
name: Fuller, Gerald G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Our work focuses on an experimental investigation of droplets freely rising through a miscible, more viscous liquid. We report observations of water droplets rising through glycerol and corn syrup, which are common household ingredients. Immediately after the drops are formed, they take on prolate shapes and rise with constant velocity without expanding in size. However, after a critical time predicted by our theory, the drops continually grow into oblate spheroids, and as they mix with the ambient liquid, their volume increases and their velocity decreases, eventually following power laws. We present scaling relations that explain the main observed phenomena. However, the power laws governing the rate of the volumetric increase and the velocity decrease, namely $t^{1/2}$ and $t^{-1/2}$, respectively, remain points of further investigation.
description: Submitted to Physics of Fluids
Spectroscopic monitoring of the BL Lac object AO 0235+164
Creators: name: Raiteri, C. M.
name: Villata, M.
name: Capetti, A.
name: Heidt, J.
name: Arnaboldi, M.
name: Magazzu`, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We performed optical spectroscopic monitoring of the BL Lac object AO 0235+164 (z=0.94) with the VLT and TNG telescopes from Aug. 2003 to Dec. 2004, during an extended WEBT campaign. The flux of this source is both contaminated and absorbed by a foreground galactic system at z=0.524, the stars of which can act as gravitational micro-lenses. In this period the object was in an optically faint, though variable state, and a broad Mg II emission line was visible at all epochs. The spectroscopic analysis reveals an overall variation in the Mg II line flux of a factor 1.9, while the corresponding continuum flux density changed by a factor 4.3. Most likely, the photoionising radiation can be identified with the emission component that was earlier recognised to be present as a UV-soft-X-ray bump in the source SED and that is visible in the optical domain only in very faint optical states. We estimate an upper limit to the BLR size of a few light months from the historical minimum brightness level; from this we infer the maximum amplification of the Mg II line predicted by the microlensing scenario. Unless we have strongly overestimated the size of the BLR, only very massive stars could significantly magnify the broad Mg II emission line, but the time scale of variations due to these (rare) events would be of several years. In contrast, the continuum flux, coming from much smaller emission regions in the jet, could be affected by microlensing from the more plausible MACHO deflectors, with variability time scales of some months.
description: 10 pages, 6 figures (1 jpg, 5 eps included), in press for A&A
Western Greenhouse Growers’ Co-operative Association : a cost-benefit analysis of marketing regulation and co-operatve structure
Creators: name: Woo, Wendy
Publisher: name: University of British Columbia
Year: 2009

description: Then, we build a model to estimate the welfare economic impacts of marketing regulations, under the Natural Products Marketing (B.C.) Act, and co-operative structure. We hypothesized that WGGCA operates under a monopolistic environment at present. If the members of WGGCA decide to incorporate the organization into a private firm, we hypothesized that some members of the organization will diverge and sell the products on their own. In this case, B.C. greenhouse tomato growers will operate under perfect competition. Therefore, we used the monopolistic situation as our base scenario and the perfect competitive situation as our alternative scenario. From our study, we found that B.C. greenhouse tomato producers gain, the consumers lose, and the society gains under the monopolistic scenario as opposed to the competitive scenario. Hence, WGGCA should remain as a co-operative because the members gain. WGGCA should remain as a co-operative and increase quota allocations in order to be competitive.
Evidence for and Analysis of Multiple Hidden Coronal Strands in Cross-Sectional Emission Profiles: Further Results from NASA's High-resolution Solar Coronal Imager
Creators: name: Williams, Thomas
name: Walsh, Robert W.
name: Peter, Hardi
name: Winebarger, Amy R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Previous work utilising NASA's High-resolution Coronal Imager (Hi-C 2.1) 17.2 nm observations revealed that, even at the increased spatial scales available in the data-set, there may be evidence for coronal structures that are still not fully resolved. In this follow-up study, cross-section slices of coronal strands are taken across the Hi-C 2.1 field-of-view. Following previous loop width studies, the background emission is removed to isolate the coronal strands. The resulting intensity variations are reproduced by simultaneously fitting multiple Gaussian profiles using a non-linear least-squares curve fitting method. In total, 183 Gaussian profiles are examined for possible structures that are hinted at in the data. The full width at half maximum (FWHM) is determined for each Gaussian, which are then collated and analysed. The most frequent structural widths are $\approx$450-575 km with 47% of the strand widths beneath NASA's Solar Dynamics Observatory Atmospheric Imaging Assembly (AIA) resolving scale (600-1000 km). Only 17% reside beneath an AIA pixel width (435 km) with just 6% of the strands at the Hi-C 2.1 resolving scale ($\approx$220-340 km). These results suggest that non-Gaussian shaped cross-sectional emission profiles observed by Hi-C 2.1 are the result of multiple strands along the integrated line-of-sight that can be resolved, rather than being the result of even finer sub-resolution elements.
Valence, spin, and orbital state of the Co ions in the one-dimensional Ca3Co2O6: an x-ray absorption and magnetic circular dichroism study
Creators: name: Burnus, T.
name: Hu, Z.
name: Haverkort, M. W.
name: Cezar, J. C.
name: Flahaut, D.
name: Hardy, V.
name: Maignan, A.
name: Brookes, N. B.
name: Tanaka, A.
name: Hsieh, H. -H.
name: Lin, H. -J.
name: Chen, C. -T.
name: Tjeng, L. H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have investigated the valence, spin, and orbital state of the Co ions in the one-dimensional cobaltate Ca3Co2O6 using x-ray absorption and x-ray magnetic circular dichroism at the Co-L2,3 edges. The Co ions at both the octahedral Co_oct and trigonal Co_trig sites are found to be in a 3+ state. From the analysis of the dichroism we established a low-spin state for the Co_oct and a high-spin state with an anomalously large orbital moment of 1.7 muB at the Co3+ trig ions. This large orbital moment along the c-axis chain and the unusually large magnetocrystalline anisotropy can be traced back to the double occupancy of the d2 orbital in trigonal crystal field.
description: 5 pages, 4 figures
title: Βέλτιστος σχεδιασμός κτηρίων από οπλισμένο σκυρόδεμα
titleType: AlternativeTitle
title: Optimum design of reinforced concrete buildings
Creators: name: Bakas, Nikolaos P.
Publisher: name: National Technological University of Athens
Year: 2012
Subjects: Υπολογιστική αντισεισμική μηχανική
Στρέψη κτηρίων
Κέντρο Ελαστικής Στροφής
Κέντρο αντοχών
Βέλτιστιος σχεδιασμός
Ανελαστική δυναμική ανάλυση
Computational earthquake engineering
Torsion in buildings
Crnter of rigidity
Center of strength
Optimum design of structures
Non linear time history analysis

description: 281 σ.
description: Στην παρούσα διατριβή, αξιολογήθηκε η επιρροή των μεγάλων εκκεντροτήτων των κέντρων ακαμψίας και αντοχής σε σχέση με το κέντρο μάζας όσον αφορά τη σεισμική απόκριση των κτηρίων. Οι διάφορες διατυπώσεις βέλτιστου σχεδιασμού αξιολογούνται ως προς την ελάχιστη στρεπτική απόκριση σε τρία επίπεδα επικινδυνότητας και ως προς το συνολικό κόστος κύκλου της ζωής. Έχει εφαρμοστεί ένας εξελικτικός αλγόριθμος βελτιστοποίησης για τη λύση των προβλημάτων βελτιστοποίησης. Η συμβολή καθώς και τα κύρια συμπεράσματα είναι: α) Ανάπτυξη μεθοδολογίας βέλτιστου σχεδιασμού γενικών τριδιάστατων κτηρίων με μεταβλητές τοπολογίας και μεγέθους. β) Ανάπτυξη λογισμικού εφαρμογής της μεθοδολογίας βέλτιστου σχεδιασμού συμπεριλαμβανομένων των κανονισμών και μη γραμμικής δυναμικής ανάλυσης με αντικειμενικές συναρτήσεις τα επιμέρους κριτήρια στρεπτικής συμπεριφοράς. και γ) Οι σχεδιασμοί με βάση το ROT (που προτείνεται μέσα από την παρούσα διατριβή), δίνουν καλύτερα αποτελέσματα σε γενικούς κτηριακούς φορείς τόσο στην ελαστική όσο και στην ανελαστική περιοχή με αξιολόγηση παραμορφώσεων και στρεπτικών ροπών βάσης κατά Chopra.
description: In the present study, the influence of large eccentricity of the centers of stiffness and strength relative to the center of mass for the seismic response of buildings are investigated. The optimal design of various formulations evaluated for minimum torsional response at three hazard levels and to the total life cycle costs. It was verified for multi-storey buildings with irregularity in plan that the rigidity center eccentricity is important mainly when the structural system behaves linearly, while for nonlinear behavior the strength’s center eccentricity becomes more important. An evolutionary optimization algorithm to solve optimization problems has been used. The contribution and the main conclusions are: a) Developing an optimal design methodology for general three-dimensional buildings with topology and size variables. b) Software development of the optimal design methodology including regulations and nonlinear dynamic analysis with objective functions of the individual criteria torsional behavior. and c) designs based on ROT (proposed in the present study) gives better results in general building both in the elastic and inelastic stage in the assessment of deformations and torsional moments at base.
Biodegradation of PCP-containing wastewater by free and immobilized cells
Creators: name: Zhu, Chun-Mei
Publisher: name: University of British Columbia
Year: 2009

description: Free and immobilized flavobacterium sp. were tested and confirmed for their degradability of synthetic PCP-containing wastewater. Laboratory scale batch and continuous reactors were developed for the research. Free flavobacterium sp. in batch reactors could completely degrade PCP into non-toxic chemicals at PCP concentrations of 30, and 50 ppm. Only partial degradation was found at PCP concentrations higher than 65 ppm. Activated sludge showed its incapability of PCP degradation, but activated sludge mixed with free flavobacterium sp. in the batch reactors showed the same degradation capability as the ones with only free flavobacterium sp. Free flavobacterium sp. had limitations for PCP degradation. Flavobacterium sp. immobilized in alginate were tested in the continuous reactors and indicated their ability to degrade 65 ppm PCP efficiently. The levels of PCP degradation by immobilized flavobacterium sp. cells decreased as the influent PCP loading rate increased, or as the hydraulic retention time (HRT) decreased. Immobilized flavobacterium sp. can tolerate higher concentrations of PCP than free ones. The research results indicate the possibility of scale-up and design of reactors for treating PCP-containing wastewater by using immobilized flavobacterium sp. cells.
Modeling transmission windows in Titan's lower troposphere: Implications for infrared spectrometers aboard future aerial and surface missions
Creators: name: Corlies, Paul
name: McDonald, George D.
name: Hayes, Alexander G.
name: Wray, James J.
name: Adamkovics, Mate
name: Malaska, Michael J.
name: Cable, Morgan L.
name: Hofgartner, Jason D.
name: Horst, Sarah M.
name: Liuzzo, Lucas R.
name: Buffo, Jacob J.
name: Lorenz, Ralph D.
name: Turtle, Elizabeth P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: From orbit, the visibility of Titan's surface is limited to a handful of narrow spectral windows in the near-infrared (near-IR), primarily from the absorption of methane gas. This has limited the ability to identify specific compounds on the surface -- to date Titan's bulk surface composition remains unknown. Further, understanding of the surface composition would provide insight into geologic processes, photochemical production and evolution, and the biological potential of Titan's surface. One approach to obtain wider spectral coverage with which to study Titan's surface is by decreasing the integrated column of absorbers (primarily methane) and scatterers between the observer and the surface. This is only possible if future missions operate at lower altitudes in Titan's atmosphere. Herein, we use a radiative transfer model to measure in detail the absorption through Titan's atmosphere from different mission altitudes, and consider the impacts this would have for interpreting reflectance measurements of Titan's surface. Over our modeled spectral range of 0.4 - 10 micron, we find that increases in the width of the transmission windows as large as 317% can be obtained for missions performing remote observations at the surface. However, any appreciable widening of the windows requires onboard illumination. Further, we make note of possible surface compounds that are not currently observable from orbit, but could be identified using the wider windows at low altitudes. These range from simple nitriles such as cyanoacetylene, to building blocks of amino acids such as urea. Finally, we discuss the implications that the identifications of these compounds would have for Titan science.
description: 52 pages, 6 figures, Icarus 2020
Superdiffusion of quantized vortices uncovering scaling behavior of quantum turbulence
Creators: name: Tang, Yuan
name: Bao, Shiran
name: Guo, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Other Condensed Matter (cond-mat.other)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Generic scaling laws, such as the Kolmogorov's 5/3-law, are milestone achievements of turbulence research in classical fluids. For quantum fluids such as atomic Bose-Einstein condensates, superfluid helium, and superfluid neutron stars, turbulence can also exist in the presence of a chaotic tangle of evolving quantized vortex lines. However, due to the lack of suitable experimental tools to directly probe the vortex-tangle motion, so far little is known about possible scaling laws that characterize the velocity correlations and trajectory statistics of the vortices in quantum-fluid turbulence (QT). Acquiring such knowledge could greatly benefit the development of advanced statistical models of QT. Here we report an experiment where a tangle of vortices in superfluid $^4$He are decorated with solidified deuterium tracer particles. Under experimental conditions where these tracers follow the motion of the vortices, we observed an apparent superdiffusion of the vortices. Our analysis shows that this superdiffusion is not due to Lévy flights, i.e., long-distance hops that are known to be responsible for superdiffusion of random walkers. Instead, a previously unknown power-law scaling of the vortex-velocity temporal correlation is uncovered as the cause. This finding may motivate future research on hidden scaling laws in QT.
description: 7 pages, 8 figures
Μελέτη της διαχείρισης εμπιστοσύνης σε ηλεκτρονικές συναλλαγές:
Creators: name: Κιόκα, Χρυσούλα Θεόδωρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Διαχείριση εμπιστοσύνης
Ηλεκτρονικές συναλλαγές
Οντολογίες
Trust management
E-commerce
Protege

description: Η παρούσα διπλωματική εργασία αποτελεί μια μελέτη πάνω στις οντολογίες, στη Διαχείριση της Εμπιστοσύνης και τη σημασία που έχει αυτή στο ηλεκτρονικό εμπόριο και κατά επέκταση στις ηλεκτρονικές συναλλαγές. Οι οντολογίες χρησιμοποιούνται για την αναπαράσταση της γνώσης στον Σημασιολογικό Ιστό. Η εμπιστοσύνη είναι απαραίτητο χαρακτηριστικό για τους συμμετέχοντες μιας συναλλαγής έτσι ώστε να υπάρχει αξιοπιστία μεταξύ τους και ολοκληρωθεί επιτυχώς η συνεργασία τους. Η Διαχείριση Εμπιστοσύνης υπηρετεί ακριβώς αυτόν τον σκοπό, επιτρέπει δηλαδή την αξιόπιστη ολοκλήρωση μιας διαδικασίας συναλλαγής ανάμεσα στα μέλη της. Για την καλύτερη κατανόηση των εννοιών της Διαχείρισης Εμπιστοσύνης αναπτύχθηκε μια πρότυπη μορφή οντολογίας στο εργαλείο υλοποίησης Protégé, η οποία αναπαριστά τις διαδικασίες της συναλλαγής και τις αλληλεπιδράσεις μεταξύ των πρακτόρων των χρηστών.
description: The present paper work constitutes a study on ontologies, on Trust Management and the significance of it on e-commerce, specifically on electronic transactions. Ontologies are mainly used to represent knowledge in Semantic Web. Trust is assumed as necessary property of the participants of a transaction so as to complete successfully their cooperation with trustworthiness. This purpose is succeeded with the application of theory of Trust Management, which enables the trustworthy interaction among the participants of a transaction. Finally, for the better apprehension of the terms and rules of Trust Management we have developed an ontology of trust model for electronic transactions using Protégé, an ontology development tool. This ontology represents the processes of a transaction and the interactions among the personal agents of the system.
The Raman Fingerprint of Graphene
Creators: name: Ferrari, A. C.
name: Meyer, J. C.
name: Scardaci, V.
name: Casiraghi, C.
name: Lazzeri, Michele
name: Mauri, Francesco
name: Piscanec, S.
name: Jiang, Da
name: Novoselov, K. S.
name: Roth, S.
name: Geim, A. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Graphene is the two-dimensional (2d) building block for carbon allotropes of every other dimensionality. It can be stacked into 3d graphite, rolled into 1d nanotubes, or wrapped into 0d fullerenes. Its recent discovery in free state has finally provided the possibility to study experimentally its electronic and phonon properties. Here we show that graphene's electronic structure is uniquely captured in its Raman spectrum that clearly evolves with increasing number of layers. Raman fingerprints for single-, bi- and few-layer graphene reflect changes in the electronic structure and electron-phonon interactions and allow unambiguous, high-throughput, non-destructive identification of graphene layers, which is critically lacking in this emerging research area.
Ο Δημήτριος Οικονόμου Καλαποθάκης και η Ελληνική Πολιτική Σκηνή:
Creators: name: Ραϊτσίνης, Χαρίλαος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2010
Subjects: Τύπος
Μακεδονικός αγώνας
Πολιτική
Press
Macedonian struggle
Politics

description: Σκοπός της διατριβής ήταν η μελέτη της πολιτικής στάσης του Δημήτριου Οικονόμου Καλαποθάκη απέναντι στην ελληνική πολιτική σκηνή. Εξετάσαμε την έκδοση των εφημερίδων που εξέδωσε ο Καλαποθάκης και το πώς επηρέασε τα πολιτικά δρώμενα. Στη συνέχεια παρουσιάσαμε τις σχέσεις του με τους Έλληνες πολιτικούς και τις πολιτικές του φιλίες. Ακόμη αναφερθήκαμε στη συμμετοχή του στο Μακεδονικό Αγώνα και το πολιτικό παρασκήνιο της εποχής. Ένα άλλο θέμα που θίξαμε ήταν η στάση του στους Βαλκανικούς Πολέμους και τον Α΄ Παγκόσμιο Πόλεμο και οι σχέσεις του με τον Βενιζέλο και τον Βασιλιά Κωνσταντίνο. Ασχοληθήκαμε επιπλέον με τις απόψεις του σχετικά με την εκστρατεία στην Ουκρανία και την Μικρασιατική Εκστρατεία και με τις σχέσεις του με τις Μεγάλες Δυνάμεις και ξένες εταιρείες.
description: The aim of the present thesis was the study of the political opinions of Dimitrios Oikonomou Kalapothakis for the Greek political scene. We examined the creation of the newspapers that Kalapothakis published and how he influenced the political situations. Furthermore, we analyzed his relationships with Greek politicians and his political friendships. We also examined his participation at the Greek Struggle for Macedonia and the political background of the era. Another aim of this study was to show Kalapothaki’s opinions about the Balkan Wars, World War 1 and his relationships with Venizelos and King Constantine. Finally we examined his thoughts about the Ukraine and Asia Minor Campaigns and his relationships with Great Powers and foreign firms.
Linguistica Forense (Carnet de Recherche)
Creators: name: Caterino, Antonello Fabio
Publisher: name: Zenodo
Year: 2021
Subjects: forensic linguistics

description: www.silf.hypotheses.org La Società Italiana di Linguistica Forense (d’ora in poi SILF) vuole pubblicare un carnet de recherche (scientific blog) per iniziare a raccogliere le riflessioni accademiche sulla linguistica forense, disciplina che in Italia è ancora in stadio embrionale. Si vorrebbero seguire i lavori della SILF, coinvolgendo esperti nazionali e internazionali di tale disciplina, in modo da aprire un tavolo di discussione permanente. Le ricerche che sottendono tali lavori sono sviluppate all’interno del Polo di Linguistica Applicata e del Polo Molisano di Informatica Umanistica del Centro di Ricerca “Lo Stilo di Fileta” , istituto riconosciuto da MIUR/CINECA e partner dell’Università degli Studi eCampus. Il presente carnet de recherche è edito su piattaforma Hypotheses da OpenEdition e promosso da Al Segno di Fileta Editore, dopo aver ottenuto una valutazione scientifica positiva dallo staff della stessa Hypotheses. La pubblicazione su Linguistica Forense, sia da parte dei soci della SILF che da parte di esterni, sono legate all’accettazione del responsabile di redazione. Periodicità: aggiornamento continuo.
X-ray magnetic circular dichroism study of Re 5d magnetism in Sr2CrReO6
Creators: name: Majewski, P.
name: Gepraegs, S.
name: Sanganas, O.
name: Opel, M.
name: Gross, R.
name: Wilhelm, F.
name: Rogalev, A.
name: Alff, L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We have measured Re 5d spin and orbital magnetic moments in the ferrimagnetic double perovskite Sr2CrReO6 by X-ray magnetic circular dichroism at the L_{2,3} edges. In fair agreement with recent band-structure calculations [Vaitheeswaran et. al., Ref 1], at the Re site a large 5d spin magnetic moment of -0.68 mu_B and a considerable orbital moment of +0.25 mu_B have been detected. We found that the Curie temperature of the double perovskites A2BB'O6 scales with the spin magnetic moment of the 'non-magnetic' B' ion.
description: 3 pages, 3 figures