cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Universality in three-dimensional Ising spin glasses: A Monte Carlo study
Creators: name: Katzgraber, Helmut G.
name: Koerner, Mathias
name: Young, A. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study universality in three-dimensional Ising spin glasses by large-scale Monte Carlo simulations of the Edwards-Anderson Ising spin glass for several choices of bond distributions, with particular emphasis on Gaussian and bimodal interactions. A finite-size scaling analysis suggests that three-dimensional spin glasses obey universality.
description: 11 pages, 12 figures, 5 tables
A class of QFTs with higher derivative field equations leading to standard dispersion relation for the particle excitations
Creators: name: Padmanabhan, T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Given any (Feynman) propagator which is Lorentz and translation invariant, it is possible to construct an action functional for a scalar field such that the quantum field theory, obtained by path integral quantization, leads to this propagator. In general, such a theory will involve derivatives of the field higher than two and can even involve derivatives of infinite order. The poles of the given propagator determine the dispersion relation for the excitations of this field. I show that it is possible to construct field theories in which the dispersion relation is the same as that of standard Klein-Gordan field, even though the Lagrangian contains derivatives of infinite order. I provide a concrete example of this situation starting from a propagator which incorporates the effects of the zero-point-length of the spacetime. I compare the path integral approach with an alternative, operator-based approach, and highlight the advantages of using the former.
Critical Binder cumulant for isotropic Ising models on square and triangular lattices
Creators: name: Selke, W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using Monte Carlo techniques, the critical Binder cumulant U* of isotropic nearest-neighbour Ising models on square and triangular lattices is studied. For rectangular shapes, employing periodic boundary conditions, U* is found to show the same dependence on the aspect ratio for both lattice types. Similarly, applying free boundary conditions for systems with square as well as circular shapes for both lattices, the simulational findings are also consistent with the suggestion that, for isotropic Ising models with short-range interactions, U* depends on the shape and the boundary condition, but not on the lattice structure.
description: 7 pages, 4 figures, submitted to J. Stat. Mech
Lens spaces, rational balls and the ribbon conjecture
Creators: name: Lisca, Paolo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25

description: We apply Donaldson's theorem on the intersection forms of definite 4--manifolds to characterize the lens spaces which smoothly bound rational homology 4--dimensional balls. Our result implies, in particular, that every smoothly slice 2--bridge knot is ribbon, proving the ribbon conjecture for 2--bridge knots.
description: 45 pages, 8 figures; accepted for publication in Geometry and Topology
Wormhole with varying cosmological constant
Creators: name: Rahaman, F.
name: Kalam, M.
name: Sarker, M.
name: Ghosh, A.
name: Raychaudhuri, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It has been suggested that the cosmological constant is a variable dynamical quantity. A class of solution has been presented for the spherically symmetric space time describing wormholes by assuming the erstwhile cosmological constant $Λ$ to be a space variable scalar, viz., $Λ$ = $Λ(r) $ . It is shown that the Averaged Null Energy Condition (ANEC) violating exotic matter can be made arbitrarily small.
description: 8 pages, 2 figures, Accepted in Gen. Rel. Grav
Multifractional, multistable, and other processes with prescribed local form
Creators: name: Falconer, K. J.
name: Vehel, J. Levy
Publisher: name: arXiv
Year: 2008
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G18

description: We present a general method for constructing stochastic processes with prescribed local form. Such processes include variable amplitude multifractional Brownian motion, multifractional $α$-stable processes, and multistable processes, that is processes that are locally $α(t)$-stable but where the stability index $α(t)$ varies with $t$. In particular we construct multifractional multistable processes where both the local self-similarity and stability indices vary.
description: 32 pages
Stellar Flares versus Luminosity: XUV-induced Atmospheric Escape and Planetary Habitability
Creators: name: Atri, Dimitra
name: Mogan, Shane R. Carberry
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Space weather plays an important role in the evolution of planetary atmospheres. Observations have shown that stellar flares emit energy in a wide energy range (10^30-10^38 ergs), a fraction of which lies in X-rays and extreme ultraviolet (XUV). These flares heat the upper atmosphere of a planet, leading to increased escape rates, and can result in atmospheric erosion over a period of time. Observations also suggest that primordial terrestrial planets can accrete voluminous H/He envelopes. Stellar radiation can erode these protoatmospheres over time, and the extent of this erosion has implications for the planet's habitability. We use the energy-limited equation to calculate hydrodynamic escape rates from these protoatmospheres irradiated by XUV stellar flares and luminosity. We use the Flare-Frequency Distribution of 492 FGKM stars observed with TESS to estimate atmospheric loss in Habitable Zone planets. We find that for most stars, luminosity-induced escape is the main loss mechanism, with a minor contribution from flares. However, flares dominate the loss mechanism of $\sim$20\% M4-M10 stars. M0-M4 stars are most likely to completely erode both their proto- and secondary atmospheres, and M4-M10 are least likely to erode secondary atmospheres. We discuss the implications of these results on planetary habitability.
description: Accepted in MNRAS Letters
The Three-Dimensional Quantum Hamilton-Jacobi Equation and Microstates
Creators: name: Bouda, A.
name: Meziane, A. Mohamed
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a stationary case and for any potential, we solve the three-dimensional quantum Hamilton-Jacobi equation in terms of the solutions of the corresponding Schrodinger equation. Then, in the case of separated variables, by requiring that the conjugate momentum be invariant under any linear transformation of the solutions of the Schrodinger equation used in the reduced action, we clearly identify the integration constants successively in one, two and three dimensions. In each of these cases, we analytically establish that the quantum Hamilton-Jacobi equation describes microstates not detected by the Schrodinger equation in the real wave function case.
description: 16 pages, no figures
Consumer Perception and Willingness to Pay for Local Food
Creators: name: Bazzani, Claudia <1985>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: AGR/01 Economia ed estimo rurale

description: A growing number of empirical studies recently investigated consumers' valuation for local
food products. However, different aspects related to the local food consumption still remain
vague or unexplored. As such, the objective of the present research is to fulfill the existing
literature using a mixed methodological approach for the investigation of consumers'
preferences and Willingness to Pay (WTP) for local food products. First of all, local food is
still a blurred concept and this factor might be source of individuals' misperception for the
local origin meaning. Therefore, a qualitative research has been performed in order to
investigate the meaning and the perception of the local food in the Italian food market.
Results from this analysis have been used as inputs for the building of a non-hypothetical
Real Choice Experiment (RCE) to estimate consumers' WTP for locally and organically
produced apple sauce. The contribution of this study is three-fold: (1) consumers' valuation
for the local origin is interpreted in terms of regional borders, over the organic food claim in
case of an unusual food product in the area of interest, (2) the interaction between individuals'
personality traits and consumers’ preferences for local and organic foods is analyzed, (3) the
role of Commitment Cost creation in consumers' choice making in case of uncertainty due to
the use of a novel food product and of an unconventional food claim is investigated. Results
suggest that consumers are willing to pay a higher price premium for organic over locally
produced apple sauce, possibly because of the presence of a regulated certification. In
accordance with Commitment Cost theory, the organic label might thus decrease consumers'
uncertainty for the features of the product in question. Results also indicate that individuals'
personality can be source of heterogeneity in consumers' preferences.
Single-mode fiber coupling with a M-SPGD algorithm for long-range quantum communications
Creators: name: Yang, Kui-Xing
name: Abulizi, Maimaiti
name: Li, Yu-Huai
name: Zhang, Bo-Yang
name: Li, Shuang-Lin
name: Liu, Wei-Yue
name: Yin, Juan
name: Cao, Yuan
name: Ren, Ji-Gang
name: Peng, Cheng-Zhi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Satellite-based quantum communication is a promising approach for realizing global-scale quantum networks. For free-space quantum channel, single-mode fiber coupling is particularly important for improving signal-to-noise ratio of daylight quantum key distribution (QKD) and compatibility with standard fiber-based QKD. However, achieving a highly efficient and stable single-mode coupling efficiency under strong atmospheric turbulence remains experimentally challenging. Here, we develop a single-mode receiver with an adaptive optics (AO) system based on a modal version of the stochastic parallel gradient descent (M-SPGD) algorithm and test its performance over an 8 km urban terrestrial free-space channel. Under strong atmospheric turbulence, the M-SPGD AO system obtains an improvement of about 3.7 dB in the single-mode fiber coupling efficiency and a significant suppression of fluctuation, which can find its applications in free-space long-range quantum communications.
description: 11 pages, 5 figures
Hamiltonian reduction and supersymmetric mechanics with Dirac monopole
Creators: name: Bellucci, Stefano
name: Nersessian, Armen
name: Yeranyan, Armen
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We apply the technique of Hamiltonian reduction for the construction of three-dimensional ${\cal N}=4$ supersymmetric mechanics specified by the presence of a Dirac monopole. For this purpose we take the conventional ${\cal N}=4$ supersymmetric mechanics on the four-dimensional conformally-flat spaces and perform its Hamiltonian reduction to three-dimensional system. We formulate the final system in the canonical coordinates, and present, in these terms, the explicit expressions of the Hamiltonian and supercharges. We show that, besides a magnetic monopole field, the resulting system is specified by the presence of a spin-orbit coupling term. A comparison with previous work is also carried out.
description: 9 pages, LaTeX file, PACS numbers: 11.30.Pb, 03.65.-w, accepted for publication in PRD; minor changes in the Conclusion, the Bibliography and the Acknowledgement
Dark-state sideband cooling in an atomic ensemble
Creators: name: Huang, Chang
name: Chai, Shijie
name: Lan, Shau-Yu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We utilize the dark state in a Λ-type three-level system to cool an ensemble of 85Rb atoms in an optical lattice [Morigi et al., Phys. Rev. Lett. 85, 4458 (2000)]. The common suppression of the carrier transition of atoms with different vibrational frequencies allows them to reach a subrecoil temperature of 100 nK after being released from the optical lattice. A nearly zero vibrational quantum number is determined from the time-of-flight measurements and adiabatic expansion process. The features of sideband cooling are examined in various parameter spaces. Our results show that dark-state sideband cooling is a simple and compelling method for preparing a large ensemble of atoms into their vibrational ground state of a harmonic potential and can be generalized to different species of atoms and molecules for studying ultracold physics that demands recoil temperature and below.
"We don’t have an education; that’s why we’re here": education and status in trades culture
Creators: name: Dawson, Jane Margaret
Publisher: name: University of British Columbia
Year: 2009

description: This study examines the symbolic meaning of education in trades culture. It explores how trades culture in this context is infused with status, and how education is an element of how tradespeople experience status in everyday working life. Education is connected with status in two ways. First, education is associated with prominent status markers, specifically wealth, mental work, and textual authority. Second, in light of these associations, tradespeople see education as having nothing to do with their own lives and work. Trades education does not count as education the same way university does. In its status associations, and perceived irrelevance to trades life, education is a symbol of an elite, prestigious, "insiders" world, of which the trades play little part. This study is located within the interpretive tradition of social inquiry most influentially first articulated by the anthropologist Clifford Geertz. The perspective on status which frames the interpretation owes much to Michael Walzer's philosophical explorations of equality and distributive justice. The empirical basis of the interpretation is drawn from an ethnographic study of a single trades setting in the non-union sector of the building industry. The main participants in the study were a crew of carpenters and other tradespeople building an expensive custom-designed family home. Fieldwork took place between October 1992 and October 1993. Site visits took place several times per week for three to four hours per visit, and involved watching, talking, listening, taking notes and photographs, and helping with routine work tasks. Field observations were augmented by interviews with crew members and other tradespeople. During the interpretive stage of the research process, "backstage tales" and "textual authority" came to be seen as key cultural vehicles for the expression of status in everyday practice. The findings of this study suggest that the exclusive status associations of education in the trades are important to recognize for at least two reasons. First, they are counter to the prevailing discourse about education which emphasizes a direct, positive link between education, economic growth, and employment. Second, the status associations of education connect it not necessarily with knowledge and learning, but with a blockage in the flow of ideas. Because their status is lesser, tradespeople's work is not esteemed, and their conceptual input is seldom recognized, sought or credited. From the vantage point of trades culture, education does not look like the tool for economic success it is often portrayed as being. This perspective is important to take into account, if educational objectives are to be egalitarian, realistic, and able to achieve their desired ends.
Τεχνικές υπόδειξης πολυμέσων που βασίζονται σε υπεργραφήματα
Creators: name: Θεοδωρίδης, Αντώνιος Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Υπόδειξη πολυμέσων
Υπεργράφημα
Βελτιστοποίηση με φειδώ ομάδων
Multimedia recommendation
Hypergraphs
Group sparse optimization

description: Λόγω της ραγδαίας άνθησης της διαδικτυακής πολυμεσικής βιομηχανίας και της ανάπτυξης νέων ψηφιακών πολυμεσικών συστημάτων, η υπόδειξη πολυμέσων αποτελεί πλέον ένα ιδιαίτερα ενεργό ερευνητικό πεδίο. Δημοφιλείς πλατφόρμες όπς το Youtube, το Last.fm ή το Pandora παρέχουν δεδομένα σχετικά με τις σχέσεις κοινωνικής δικτύωσης, τις σχέσεις φιλίας, τις ακουστικές σχέσεις ή τις σχέσεις επισήμανσης, οι οποίες είναι πολύτιμες στη διαδικασία τις υπόδειξης πολυμέσων. Έτσι, αποτελεί πρόκληση η μοντελοποίηση των ποικίλων αυτών σχέσεων μεταξύ διαφορετικών αντικειμένων σε ένα ενοποιημένο πλαίσια. Στη μεταπτυχιακή αυτή διατριβή, το πρόβλημα της μουσικής υπόδειξης εκφράζεται ως πρόβλημα ταξινόμησης υπεργραφήματος, προτείνοντας ένα ρυθμιστικό πλαίσιο με έμφαση στη δομή των δεδομένων σε διακριτές ομάδες, ελέγχοντας έτσι πως αυτές επιδρούν στη διαδικασία της υπόδειξης. Η προτεινόμενη μέθοδος υλοποιήθηκε σε πειραματικά δεδομένα που συλλέχθηκαν απο το Last.fm και η αποτελεσματικότητα της συγκρίθηκε με αντίστοιχες μεθόδους υπόδειξης. Τα αποτελέσματα δείχνουν πως η αξιοποίηση των ομάδων στα δεδομένα μπορεί να βελτιώσει την ακρίβεια της υπόδειξης.
description: The growth of the online music industry and the development of new online music platforms, turned music recommendation into an active research area. Popular music platforms such as Last.fm, Grooveshark or Pandora provide information about social relations, friend relations, listening relations or tagging relations, which could be valuable for music recommendation. Therefore it is a challenge to model these relations between different types of objects efficiently in a unified framework. In this thesis, the recommendation problem is expressed as a hypergraph ranking problem, introducing a regularization framework emphasizing the group structure of the graph, by controlling how different types of groups affect the recommendation process. We evaluated our method's efficiency with experiments on data collected from Last.fm online music platform. The evaluation results showed that by exploiting the group structure of the data, the recommendation accuracy can be significantly increased.
Finite-size scaling in complex networks
Creators: name: Hong, Hyunsuk
name: Ha, Meesoon
name: Park, Hyunggyu
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A finite-size-scaling (FSS) theory is proposed for various models in complex networks. In particular, we focus on the FSS exponent, which plays a crucial role in analyzing numerical data for finite-size systems. Based on the droplet-excitation (hyperscaling) argument, we conjecture the values of the FSS exponents for the Ising model, the susceptible-infected-susceptible model, and the contact process, all of which are confirmed reasonably well in numerical simulations.
"All this talk!" : stories of women learning
Creators: name: Chapman, Valerie-Lee
Publisher: name: University of British Columbia
Year: 2009

description: My own experience as a mature woman student led me to question how women learn. A review of literature on adult learning theory, feminist scholarship, postmodern thought and educational program planning was undertaken and a research question synthesised. I asked five mature women program planners who had returned to formal graduate education, either as part time or full time students: How has your experience of learning as a woman affected your program planning practice? The organizing methodology for the study was narrative or storying, infused with the principles of feminist research practice. There were three individual interviews, and then a group meeting. An initial life story analysis was given to the five women and we discussed interpretations. The study was then written up to include my own learning experiences, and the whole text analyzed to see what our personal narratives revealed about the larger educational discourse. The women's stories of learning fell into three categories of experience: In the first, the metaphor is talk, in the second, the metaphor is opposition—from the "old, male model", in the third, the metaphor is power. Some conclusions: The women's stories validated much of the feminist literature on women's ways of learning; women struggle to learn under the "old, male model"; learning at school was more challenging than learning at work; good teaching is as important as how learning is designed; power-knowledge structures in higher education are well hidden, but still regulate and discipline women learning; that these women resisted regulation; that while men and women are often alienated, seeing their opposite sex as the Other, there is "another way", and, finally, that the (male) use of planning as a metaphor for negotiating power and responsibility is not sufficient to describe how the women plan. Rather, their metaphor might be that planning is creative modelling, an embodying of good learning experiences in planning practice. Their suggested model for planning focuses on intention, modelling, courage and creativity. Implications for practice include making gender visible, making power visible and honouring feminist work.
Temperature Dependence Analysis of the NIR Spectra of Liquid Water confirms the existence of two phases, one of which is in a coherent state
Creators: name: Renati, Paolo
name: Kovacs, Zoltan
name: De Ninno, Antonella
name: Tsenkova, Roumiana
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Isosbestic (equal absorption) points in the IR and NIR spectra of liquid water are a well known feature and they witness the existence of two populations of oscillators in the probed system. Despite it is a well known experimental fact, in the mainstream molecular dynamics approach the proposed theoretical explanations for it are not able to elucidate which is the physical reason why such a cut off frequency (at the isosbestic point) does exist. We investigate pure Milli-Q water on increasing the temperature in the vis-NIR range (400-2500 nm). We specifically payed attention to the first overtone region (1300-1600 nm) of the OH-bond stretching-mode where an isosbestic point has been observed. A second derivative analysis clearly shows two modes, which can be assigned to water molecules involved in different hydrogen bonding configurations whose relative abundance is controlled by the temperature. We have also observed that the ratio of these modes follows a van't Hoff behavior supporting that their energy difference (energy gap) is independent on the temperature. Furthermore, a log-log plot shows a scale invariance of the population ratio with respect to the perturbation (temperature), confirming the existence of a long range correlated dynamics in the liquid. We show that the two phases differences between energy and entropy estimated from the experimental data can be compared with the predictions of Quantum Electro Dynamics (QED) showing a remarkable agreement.
description: 14 pages, 10 figures, 1 table
Polaronic transport through molecular quantum dots: charging-induced NDR and rectifying behavior
Creators: name: Walczak, Kamil
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Here we study the polaronic transport through molecules weakly connected to metallic electrodes in the nonlinear response regime. Molecule itself is treated as a quantum dot with discrete energy levels, its connection to the electrodes is described within the wide-band approximation, while the charging is incorporated by means of the self-consistent potential. Nonperturbative computational scheme, used in this work, is based on the Green's function theory within the framework of mapping technique (GFT-MT). This method transforms the many-body electron-phonon interaction problem into a one-body multi-channel single-electron scattering problem with occupation of polaron levels calculated in the self-consistent way. In particular, three different phenomena as a result of charging in polaronic transport via discrete quantum states are discussed in detail: the suppression of the current at higher voltages, negative differential resistance (NDR effect), and rectification.
description: 9 pages, 3 figures
Intrinsic Donor-Bound Excitons in Ultraclean Monolayer Semiconductors
Creators: name: Rivera, Pasqual
name: He, Minhao
name: Kim, Bumho
name: Liu, Song
name: Rubio-Verdú, Carmen
name: Moon, Hyowon
name: Mennel, Lukas
name: Rhodes, Daniel A.
name: Yu, Hongyi
name: Taniguchi, Takashi
name: Watanabe, Kenji
name: Yan, Jiaqiang
name: Mandrus, David G.
name: Dery, Hanan
name: Pasupathy, Abhay
name: Englund, Dirk
name: Hone, James
name: Yao, Wang
name: Xu, Xiaodong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The monolayer transition metal dichalcogenides are an emergent semiconductor platform exhibiting rich excitonic physics with coupled spin-valley degree of freedom and optical addressability. Here, we report a new series of low energy excitonic emission lines in the photoluminescence spectrum of ultraclean monolayer WSe2. These excitonic satellites are composed of three major peaks with energy separations matching known phonons, and appear only with electron doping. They possess homogenous spatial and spectral distribution, strong power saturation, and anomalously long population (> 6 $μ$s) and polarization lifetimes (> 100 ns). Resonant excitation of the free inter- and intra-valley bright trions leads to opposite optical orientation of the satellites, while excitation of the free dark trion resonance suppresses the satellites photoluminescence. Defect-controlled crystal synthesis and scanning tunneling microscopy measurements provide corroboration that these features are dark excitons bound to dilute donors, along with associated phonon replicas. Our work opens opportunities to engineer homogenous single emitters and explore collective quantum optical phenomena using intrinsic donor-bound excitons in ultraclean 2D semiconductors.
description: to be appear in Nature Communications
About the relation between the quasiparticle Green's function in cuprates obtained from ARPES data and the magnetic susceptibility
Creators: name: Inosov, D. S.
name: Borisenko, S. V.
name: Eremin, I.
name: Kordyuk, A. A.
name: Zabolotnyy, V. B.
name: Geck, J.
name: Koitzsch, A.
name: Fink, J.
name: Knupfer, M.
name: Büchner, B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Angle resolved photoemission spectroscopy (ARPES) provides a detailed view of the renormalized band structure in cuprates and, consequently, is a key to the self-energy and the quasiparticle Green's function. Such information gives a clue to the comparison of ARPES with scanning tunneling microscopy, inelastic neutron scattering (INS), and Raman scattering data. Here we touch on a potential possibility of such a comparison with the dynamical magnetic susceptibility measured in INS experiments. Calculations based on the experimentally measured quasiparticle self-energies in cuprates lead to the estimated magnetic susceptibility response with many-body effects taken into account.
description: Will be presented at the M2S-HTSC-VIII conference in Dresden
title: Εκχύλιση φαινολικών ουσιών από παραπροϊόντα κρόκου με χρήση πειραματικού σχεδιασμού και υγρής χρωματογραφίας – φασματομετρίας μάζας
title: Evaluation of total phenolic content, antioxidant and antiradical activity of ultra-sound assisted extracts of saffron by-products and identification of their phytochemical profile using untargeted LC-MS/MS analysis
titleType: AlternativeTitle
Creators: name: Λυκούδη, Ελένη
name: Χατζηκωνσταντίνου, Μαρία
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Παραπροϊόντα Crocus sativus
Eκχύλιση με υπερήχους
Φαινολικό περιεχόμενο
Αντιοξειδωτική ικανότητα
Αντιριζική ικανότητα
LC-MS/MS

description: Το θέμα της παρούσας πτυχιακής αφορά την εκτίμηση του ολικού φαινολικού περιεχομένου, της αντιριζικής και αντιοξειδωτικής δράσης εκχυλισμάτων παραπροϊόντων κρόκου Κοζάνης με στόχο την αξιοποίηση των φαινολικών ενώσεων στην βιομηχανία τροφίμων ως ενισχυτικοί παράγοντες. Αναφέρθηκαν σημαντικές πληροφορίες για το φυτό Crocus sativus L. που αφορούν την καλλιέργεια και την συγκομιδή του καθώς και την χρηστικότητα του στην διατροφή αλλά και στην λαϊκή ιατρική, η οποία ώθησε τους επιστήμονες στην έρευνα των φαρμακευτικών του ιδιοτήτων. Στην συνέχεια αναπτύχθηκαν εν συντομία οι μέθοδοι εκχυλίσεων φαινολικών ενώσεων αιτιολογώντας την επιλογή της πράσινης τεχνικής της εκχύλισης με σύστημα υπερήχων (Ultrasound assisted extractiom, UAE) στο συγκεκριμένο πείραμα. Αναφορικά με το πειραματικό κομμάτι πραγματοποιήθηκε βελτιστοποίηση της διαδικασίας και για τους ακόλουθους παράγοντες: (α) περιεκτικότητα σε αιθανόλη (%) σε μείγμα διαλύτη νερού/αιθανόλης, β) χρόνος εκχύλισης (λεπτά), γ) ισχύς υπερήχων (%) και δ) αναλογία διαλύτη/υλικού (ml/g), με τη βοήθεια του πειραματικού σχεδιασμού Box-Behnken. Η μεταβλητή απόκρισης ήταν η περιεκτικότητα σε ολικές φαινολικές ενώσεις (TPC), όπως προσδιορίστηκε με τη μέθοδο Folin-Ciocalteu. Οι βελτιστοποιημένες συνθήκες, σύμφωνα με τον πειραματικό σχεδιασμό, έδωσαν αποτελέσματα TPC 90,2-799,2 mg GAE/100g ξηρού δείγματος. Επιπλέον εφαρμόστηκε η δοκιμασία της αναγωγικής - αντιοξειδωτικής ισχύος σιδήρου (FRAP) για την εκτίμηση της αντιοξειδωτικής δράσης των δειγμάτων, όπου και δόθηκε εύρος τιμών 14,6-119,5 mg Fe+2/g ξηρού δείγματος στις βέλτιστες συνθήκες, καθώς και η δοκιμασία ενεργότητας απορρόφησης σε 2,2'-Azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS•+) για την εκτίμηση της αντιριζικής δράσης η οποία προσδιορίστηκε σε εύρος τιμών 3,5-18,0 mg TE/g ξηρού δείγματος στις βέλτιστες συνθήκες. Τέλος, πραγματοποιήθηκε τεχνική υγρής χρωματογραφίας-φασματομετρίας μάζας (LC-MS/MS) για την ταυτοποίηση χαρακτηριστικών φαινολικών ενώσεων στα εκχυλίσματα των παραπροϊόντων.
Connected allocation to Poisson points in R^2
Creators: name: Krikun, Maxim
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: This note answers one question in [math.PR/0505668], concerning the connected allocation for the Poisson process in R^2. The proposed solution makes use of the Riemann map from the plane minus the minimal spanning forest of the Poisson point process to the halfplane. A picture of a numerically simulated example is included.
description: 6 pages, 3 figures; figures optimized
Διαταραχές γεύσης
Creators: name: Ιορδανίδου, Ελένη Φωτίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Γεύση
Διαταραχή γεύσης
Αιτίες διαταραχής γεύσης
Taste
Taste disorders
Causes of taste disorders

description: Η λειτουργία της γεύσης καθώς και της όσφρησης αποτελούν σημαντικές αισθήσεις που επιτρέπουν την επιβίωση του ατόμου και όταν λειτουργούν σωστά συμβάλλουν στην ποιότητα ζωής. Οι διαταραχές της γεύσης και της όσφρησης παρουσιάζουν συχνότητα της τάξης του 1% σε άτομα κάτω των 65 ετών ενώ σε μεγαλύτερες ηλικίες το ποσοστό αυξάνεται στο 50%. Η οπισθορινική όσφρηση συνδέεται με τη λειτουργία της γεύσης και θα πρέπει να ελέγχεται όταν διερευνώνται διαταραχές της γεύσης. Οι αιτιολογικοί παράγοντες που ενοχοποιούνται για την εμφάνιση διαταραχών της γεύσης είναι η ηλικία, τα φάρμακα, τοπικοί παράγοντες της στοματικής κοιλότητας (καντιντίαση, κάπνισμα κ.α), η έκθεση σε τοξικά προϊόντα, χειρουργικές επεμβάσεις (μέσου ωτός, αμυγλαδεκτομή κ.α), όγκοι του εγκεφάλου και κάποιες συστηματικές νόσοι. Η ολοκληρωμένη διάγνωση και αντιμετώπιση των διαταραχών αυτών προϋποθέτει τη λήψη ενός ολοκληρωμένου ιατρικού και οδοντιατρικού ιστορικού με στοχευμένες ερωτήσεις, την λεπτομερή κλινική εξέταση όχι μόνο της στοματικής, αλλά και της ρινικής κοιλότητας, τον πλήρη αιματολογικό έλεγχο, πιθανή ακτινογραφική απεικόνιση των δομών που μας ενδιαφέρουν και την αντικειμενική μέτρηση της γεύσης με τις διαθέσιμες μεθόδους (γευστικές ταινίες, γευσιομετρία). Η συνδυαστική αξιολόγηση των στοιχείων θα οδηγήσει σε διάγνωση και θεραπεία των διαταραχών γεύσης που αποκαλύπτουν συνήθως την ύπαρξη κάποιας νόσου ή κατάστασης που χρήζει αντιμετώπισης. Η ιδιοπαθής μορφή των διαταραχών γεύσης αντιμετωπίζεται με σκεύασμα ψευδαργύρου με θετικά αποτελέσματα.
description: The sense of smell and taste in mammals, including humans is considered an important tool for the nutrition playing an important role in quality of life. Taste and smell disorders are present in 1% of persons under 65 years old and reach 50% in older people. Retronasal olfaction participates in the sense of taste and its normal function should be tested when taste disorder is present. The responsible causative factors include age, some medication, topical conditions of the oral cavity (candidiasis, smoke etc), toxic products, surgeries of middle ear, tonsillectomy, brain tumors, systematic diaseases etc. The therapeutic approach of taste disorders includes a detailed medical and dental history, clinical examination of the oral and nasal cavity, full blood tests with additional radiographic examination of adjacent structures and the objective measurement of taste with the available methods (taste strips, electrogustometry). The combination of the above can lead to safe diagnosis and therapeutic approach of taste disorders where usually an underlying disease or condition that needs to be handled is found. An algorithm for the therapeutic approach of taste disorders is suggested taking the available treatment methods into account. Idiopathic dysgeusia is treated with zinc complement with promising results.
Accurate Determination of the Charge Transfer Efficiency of Photoanodes for Solar Water Splitting
Creators: name: Klotz, Dino
name: Grave, Daniel A.
name: Rothschild, Avner
Publisher: name: arXiv
Year: 2020
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The oxygen evolution reaction (OER) at the surface of semiconductor photoanodes involves photo-generated holes that oxidize water. A certain fraction of the holes that reach the surface recombine with electrons from the conduction band, giving rise to the surface recombination loss. The charge transfer efficiency, xt, defined as the ratio between the flux of holes that contribute to the water oxidation reaction and the total flux of holes that reach the surface, is an important parameter that helps to distinguish between bulk and surface recombination losses. However, accurate determination of xt by conventional voltammetry measurements is complicated because only the total current is measured and it is difficult to discern between different contributions to the current. Chopped light measurement and hole scavenger measurement techniques are widely employed to determine xt, but they often lead to errors. Intensity modulated photocurrent spectroscopy (IMPS) is better suited for accurate determination of xt because it provides direct information on both the total photocurrent and the surface recombination current. Careful analysis of IMPS measurements at different light intensities is required to account for nonlinear effects. We compare the xt values obtained by these methods using heteroepitaxial hematite photoanodes. A wide spread of xt values is obtained by different analysis methods and different light sources and light intensities. Statistical analysis of the results show good correlation between different methods for measurements carried out with the same light source, light intensity and potential. However, there is a considerable spread in the results obtained by different methods. For accurate determination of xt, we recommend IMPS measurements with a bias light intensity such that the irradiance is as close as possible to the standard solar spectrum.
Non-volatile reconfigurable spin logic device: parallel operations
Creators: name: Patra, Moumita
name: Shukla, Alok
name: Maiti, Santanu K
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A new proposal is given for designing a non-volatile, completely spin logic device, that can be reprogrammed for different functional classical logical operations. We use the concept of bias driven spin dependent circular current and current induced magnetic field in a quantum ring under asymmetric ring-to-electrode interface configuration to implement all the Boolean operations. We extend our idea to build two kinds of parallel computing architectures for getting parallelized operations, all at a particular time. For one case, different kinds of parallel operations are performed in a single device, whereas in the other type all the possible inputs of a logic gate are processed in parallel and all the outputs are read simultaneously. The performance and reliability are investigated in terms of power, delay and power-delay-product and finally the system temperature. We find that both the individual and simultaneous logic operations studied here are much superior compared to the operations performed in different conventional logic families like complementary metal oxide semiconductor logic, transistor-transistor logic, etc. The key advantage is that we can perform several logic operations, as many as we wish, repeating the same or different logic gates using a single setup, which indeed reduces wiring in the circuits and hence consumes much less power. Our analysis can be utilized to design optimized logic circuits at nano-scale level.
description: 11 pages, 6 figures
Could we identify hot Ocean-Planets with CoRoT, Kepler and Doppler velocimetry?
Creators: name: Selsis, F.
name: Chazelas, B.
name: Borde, P.
name: Ollivier, M.
name: Brachet, F.
name: Decaudin, M.
name: Bouchy, F.
name: Ehrenreich, D.
name: Griessmeier, J. -M.
name: Lammer, H.
name: Sotin, C.
name: Grasset, O.
name: Moutou, C.
name: Barge, P.
name: Deleuil, M.
name: Mawet, D.
name: Despois, D.
name: Kasting, J. F.
name: Leger, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Planets less massive than about 10 MEarth are expected to have no massive H-He atmosphere and a cometary composition (50% rocks, 50% water, by mass) provided they formed beyond the snowline of protoplanetary disks. Due to inward migration, such planets could be found at any distance between their formation site and the star. If migration stops within the habitable zone, this will produce a new kind of planets, called Ocean-Planets. Ocean-planets typically consist in a silicate core, surrounded by a thick ice mantle, itself covered by a 100 km deep ocean. The existence of ocean-planets raises important astrobiological questions: Can life originate on such body, in the absence of continent and ocean-silicate interfaces? What would be the nature of the atmosphere and the geochemical cycles ? In this work, we address the fate of Hot Ocean-Planets produced when migration ends at a closer distance. In this case the liquid/gas interface can disappear, and the hot H2O envelope is made of a supercritical fluid. Although we do not expect these bodies to harbor life, their detection and identification as water-rich planets would give us insight as to the abundance of hot and, by extrapolation, cool Ocean-Planets.
description: 47 pages, 6 Fugures, regular paper. Submitted to Icarus
The 1838-1839 courts-martial of patriotes in Lower Canada : were they "constitutional"?
Creators: name: Thorburn, Mark Allen
Publisher: name: University of British Columbia
Year: 2009

description: The thesis primarily examines the legality of the courtsmartial that followed the 1838-1839 rebellion in Lower Canada against the contemporary principles of British jurisprudence and concludes that Sir John Colborne, the acting governor of the colony, and others within the governing political elite of Lower Canada exceeded their authority and violated the British Constitution in order to obtain convictions and executions of Patriotes for the purpose of satisfying their perception of justice and to deter another rebellion. The paper also concludes that what happened in Lower Canada is an example of the "law" being created by one or more of society's segments in favour of the interest of the dominant class or groups over the rest of society. Furthermore, fundamental legal rights are tossed aside when they are deemed an impediment by the dominant class or groups and the rule of law will only prevail when those in authority feel secure from serious threats. The work looks at the nature of law, its social contexts, and its relationship to power. It also discusses the history of the prohibition in Great Britain against the court-martial of civilians, the entitlement of British colonists and the inhabitants of "conquered colonies" to the legal rights of British subjects, and the use of courts-martial in the early nineteenth century in Upper Canada, South Africa, and the British Caribbean. All of the materials used herein were found in the University of British Columbia's Main Library, Law Library, and Sedgewick Library.
Search for Continuous Gravitational Waves from Scorpius X-1 in LIGO O2 Data
Creators: name: Zhang, Yuanhao
name: Papa, Maria Alessandra
name: Krishnan, Badri
name: Watts, Anna L.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present the results of a search in LIGO O2 public data for continuous gravitational waves from the neutron star in the low-mass X-ray binary Scorpius X-1. We search for signals with $\approx$ constant frequency in the range 40-180 Hz. Thanks to the efficiency of our search pipeline we can use a long coherence time and achieve unprecedented sensitivity, significantly improving on existing results. This is the first search that has been able to probe gravitational wave amplitudes that could balance the accretion torque at the neutron star radius. Our search excludes emission at this level between 67.5 Hz and 131.5 Hz, for an inclination angle $44^\circ \pm 6^\circ$ derived from radio observations (Fomalont et al. 2001), and assuming that the spin axis is perpendicular to the orbital plane. If the torque arm is $\approx $ 26 km -- a conservative estimate of the \alfven\ radius -- our results are more constraining than the indirect limit across the band. This allows us to exclude certain mass-radius combinations and to place upper limits on the strength of the star's magnetic field. We also correct a mistake that appears in the literature in the equation that gives the gravitational wave amplitude at the torque balance (Abbott et al. 2017b, 2019a) and we re-interpret the associated latest LIGO/Virgo results in light of this.
description: 12 pages, 4 figures
Masses of Fermions in Supersymmetric Models
Creators: name: Maekawa, C. M.
name: Rodriguez, M. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the mass generation for the usual quarks and leptons in some supersymmetric models. The masses of the top, the bottom, the charm, the tau and the muon are given at the tree level. All the other quarks and the electron get their masses at the one loop level in the Minimal Supersymmetric Standard Model (MSSM) and in two Supersymmetric Left-Right Models, one model uses triplets (SUSYLRT) to break $SU(2)_{R}$-symmetry and the other use doublets(SUSYLRD).
description: 24 pages, 2 figures and 3 tables
Ring-Frustrated Non-Hermitian $XY$ Model
Creators: name: Bi, Shihao
name: He, Yan
name: Li, Peng
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a non-Hermitian version of XY closed chain with odd number of lattice sites. We consider both anti-ferromagnetic coupling and also a symmetric non-collinear spin coupling. It is found that the energy spectrum is real in certain region of the parameter space. In contrast to previous non-Hermitian models, the ground state is a state with one mode occupied inside this real energy spectrum region, instead of the artificially identified vacuum state. At the same time, there appears a gapless excitation, which is made by kink like spin configurations. It is also found that this kink phase has non-trivial topological invariant.
description: 5 pages, 5 figures
Entanglement Entropy beyond the Free Case
Creators: name: Barthel, T.
name: Dusuel, S.
name: Vidal, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a perturbative method to compute the ground state entanglement entropy for interacting systems. We apply it to a collective model of mutually interacting spins in a magnetic field. At the quantum critical point, the entanglement entropy scales logarithmically with the subsystem size, the system size, and the anisotropy parameter. We determine the corresponding scaling prefactors and evaluate the leading finite-size correction to the entropy. Our analytical predictions are in perfect agreement with numerical results.
description: 4 pages, 3 figures, published version
Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe$_3$
Creators: name: Gati, Elena
name: Wilde, John M.
name: Khasanov, Rustem
name: Xiang, Li
name: Dissanayake, Sachith
name: Gupta, Ritu
name: Matsuda, Masaaki
name: Ye, Feng
name: Haberl, Bianca
name: Kaluarachchi, Udhara
name: McQueeney, Robert J.
name: Kreyssig, Andreas
name: Bud'ko, Sergey L.
name: Canfield, Paul C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: LaCrGe$_3$ has attracted attention as a paradigm example of the avoidance of ferromagnetic (FM) quantum criticality in an itinerant magnet. By combining thermodynamic, transport, x-ray and neutron scattering as well as $μ$SR measurements, we refined the temperature-pressure phase diagram of LaCrGe$_3$. We provide thermodynamic evidence (i) for the first-order character of the FM transition when it is suppressed to low temperatures and (ii) for the formation of new phases at high pressures. From our microscopic data, we infer that short-range FM ordered clusters exist in these high-pressure phases. These results suggest that LaCrGe$_3$ is a rare example, which fills the gap between the two extreme limits of avoided FM quantum criticality in clean and strongly disordered metals.
description: 7 pages, 4 figures plus Supplemental Information