cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Detection of seven 2+2 doubly eclipsing quadruple systems
Creators: name: Zasche, P.
name: Henzl, Z.
name: Masek, M.
name: Uhlar, R.
name: Kara, J.
name: Merc, J.
name: Kucakova, H.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this work, we study a heterogeneous group of seven stellar systems for the first time. Despite their different distances or spectral types, all of them belong to a very rare group of quadruple systems of 2+2 architecture, where both of the inner pairs harbor eclipsing binaries. These systems are: ASASSN-V J102911.57-522413.6 (inner periods 0.57272, and 3.79027 days), V1037 Her (0.78758 and 5.80348 days), WISE J181904.2+241243 (0.36713 and 0.41942 days), V2894 Cyg (2.57434 and 1.30579 days), NSVS 5725040 (1.79368 and 0.76794 days), WISE J210230.8+610816 (1.84324 and 0.57159 days), and ZTF J220518.78+592642.1 (2.79572 and 3.34615 days). Their outer mutual periods are: 9.3, 25.4, 18.7, 27.5, 2.6, 2.2, and 14.0 yr, respectively. These outer periodicities were derived using longer time span of photometric observations of these systems and analysing their period changes of both inner pairs via ETVs (eclipse-timing variations). Most of these studied systems are detached, as evidenced by the proper modelling of their light curves. A few of them show significant eccentric orbits with apsidal motion (e.g. V2894 Cyg, and NSVS 5725040). Further spectroscopic follow-up observations would offer a better characterization of the component star's parameters (for e.g. NSVS 5725040), as well as a potential interferometric detection of the systems as real doubles on their mutual orbits (for e.g. V1037 Her). A rather interesting excess of systems close to a 3:2 mean motion resonance is seen only for early spectral-type stars with higher temperatures.
description: 10 pages, 16 figures, 3 tables, published in A&A as DOI: https://doi.org/10.1051/0004-6361/202346848
Extremal statistics of a one dimensional run and tumble particle with an absorbing wall
Creators: name: Singh, Prashant
name: Santra, Saikat
name: Kundu, Anupam
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the extreme value statistics of a run and tumble particle (RTP) in one dimension till its first passage to the origin starting from the position $x_0~(>0)$. This model has recently drawn a lot of interest due to its biological application in modelling the motion of certain species of bacteria. Herein, we analytically study the exact time-dependent propagators for a single RTP in a finite interval with absorbing conditions at its two ends. By exploiting a path decomposition technique, we use these propagators appropriately to compute the joint distribution $\mathscr{P}(M,t_m)$ of the maximum displacement $M$ till first-passage and the time $t_m$ at which this maximum is achieved exactly. The corresponding marginal distributions $\mathbb{P}_M(M)$ and $P_M(t_m)$ are studied separately and verified numerically. In particular, we find that the marginal distribution $P_M(t_m)$ has interesting asymptotic forms for large and small $t_m$. While for small $t_m$, the distribution $P_M(t_m)$ depends sensitively on the initial velocity direction $σ_i$ and is completely different from the Brownian motion, the large $t_m$ decay of $P_M(t_m)$ is same as that of the Brownian motion although the amplitude crucially depends on the initial conditions $x_0$ and $σ_i$. We verify all our analytical results to high precision by numerical simulations.
description: 25 pages, 6 figures
Defining Neuromarketing: Practices and Professional Challenges
Creators: name: Fisher, Carl Erik
name: Chin, Lisa J.
name: Klitzman, Robert L.
Publisher: name: Columbia University
Year: 2010
Subjects: Neuromarketing
Psychiatry
Bioethics

description: Neuromarketing has recently generated controversies concerning the involvement of medical professionals, and many key questions remain—ones that have potentially important implications for the field of psychiatry. Conflicting definitions ofneuromarketinghave been proposed, and little is known about the actual practices of companies, physicians, and scientists involved in its practice. This article reviews the history of neuromarketing and uses an exploratory survey of neuromarketing Web sites to illustrate ethical issues raised by this new field. Neuromarketing, as currently practiced, is heterogeneous, as companies are offering a variety of technologies. Many companies employ academicians and professionals, but few list their clients or fees. Media coverage of neuromarketing appears disproportionately high compared to the paucity of peer-reviewed reports in the field. Companies may be making premature claims about the power of neuroscience to predict consumer behavior. Overall, neuromarketing has important implications for academic-industrial partnerships, the responsible conduct of research, and the public understanding of the brain. We explore these themes to uncover issues relevant to professional ethics, research, and policy. Of particular relevance to psychiatry, neuromarketing may be seen as an extension of the search for quantification and certainty in previously indefinite aspects of human behavior.
Dimensional Reduction of Cobordism and K-theory
Creators: name: Blumenhagen, Ralph
name: Cribiori, Niccolò
name: Kneissl, Christian
name: Makridou, Andriana
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: It has been proposed that cobordism and K-theory groups, which can be mathematically related in certain cases, are physically associated to generalised higher-form symmetries. As a consequence, they should be broken or gauged in any consistent theory of quantum gravity, in accordance with swampland conjectures. We provide further support to this idea by showing that cobordism and K-theory groups of a general manifold $X$ reproduce the pattern of symmetries expected from the dimensional reduction of the theory on $X$, as well as their breaking and gauging. To this end, we employ the Atiyah-Hirzebruch spectral sequence to compute such groups for common choices of $X$ in string compactifications.
description: 55 pages + appendices, v2: major modifications in sec. 4.3, published version
Im Schatten der Armory Show 2010 “Collecting in the New Economy” und “Art Restitution in Austria” Bericht von einer spannenden Messewoche in New York
Creators: name: Schroeter, Philine L.
Publisher: name: Kunstrechtsspiegel
Year: 2017

description: -
description: Kunstrechtsspiegel, Nr. 2 (2010): Kunstrechtsspiegel
title: Ανάδειξη αρχαιολογικού χώρου μέσω της ενεργοποίησης του φυσικού τοπίου: Το παράδειγμα της Υστερομινωικής Νεκρόπολης Αρμένων
Creators: name: Φωτου Χριστιαννα
name: Παναγιωτοπουλου Χρυσαυγη
Publisher: name: Technical University of Crete
Year: 2013

description: Αντικείμενο της παρούσας εργασίας αποτελεί η ανάδειξη και προστασία αρχαιολογικού χώρου σε φυσικό τοπίο. Πιο συγκεκριμένα, μελετάται το παράδειγμα της Υστερομινωικής νεκρόπολης στους Αρμένους Ρεθύμνου.

Κάθε πολιτιστικό τοπίο είναι ένα δυναμικό σύστημα, όπου ο χώρος και ο χρόνος αποτελούν αναπόσπαστο σύνολο. Στα μνημεία ο χρόνος μετριέται σε φθορά, ενώ στη φύση σε κύκλους ζωής. Η διττή αυτή κατάσταση νοηματοδοτείται από την ανθρώπινη κίνηση και τη δραματοποίηση υπαρχόντων χωρικών ποιοτήτων, ώστε να αναδειχθεί η  ταυτότητα των στοιχείων του τοπίου και να ενισχυθούν οι μορφές του.
Creating and selling embryos for “donation”: ethical challenges
Creators: name: Klitzman, Robert L.
name: Sauer, Mark V.
Publisher: name: Columbia University
Year: 2015
Subjects: Human reproductive technology
Human reproductive technology--Moral and ethical aspects
Human embryo
Bioethics

description: The commercial creation and sale of embryos has begun, which poses a series of ethical questions that have received little scholarly attention. Some of the concerns that arise are similar to those posed by the sale of gametes, while other issues differ markedly. Questions emerge, first, regarding the rights of the unborn children and their ability to know their biological parents. Companies that create human embryos de novo may wish to keep gamete providers anonymous. Many of these offspring thus will never learn that their parents are not their biologic parents. Yet, such disclosures, regarding not only one but both of these biologic parents, may be important for these individuals; and a lack of this knowledge may impede their physical and psychological health. Second, questions surface regarding the fees that providers should charge for embryos and whether these amounts should vary based on the traits of 1 or both of the gamete donors. Some prospective parents may seek specific traits in a baby (eg, height or eye/hair coloring), which prompts the creation of embryos from 2 gamete donors who possess these characteristics. Third, ownership of embryos created without an advanced directive by patients poses dilemmas (eg, disposition of any remaining embryos). Fourth, guidelines do not yet exist to limit the number of embryos sold from each pair of gamete donors. Hence, unbeknownst to each other, full siblings could potentially meet, get married, and procreate. This discussion has several critical implications for future practice and professional education and policy. Patients with diseases associated with genetic tests may well ask obstetricians, gynecologists, and other physicians about these techniques and practices. Clinicians can refer such patients to assisted reproductive technology specialists; however, familiarity with the basic aspects of the issues and complexities involved could aid these providers and their patients Several of these issues can be addressed relatively easily through guidelines from professional associations (eg, limiting the number of embryos sold from each pair of gamete donors). Because creation and sales of embryos will likely spread, consideration of appropriate responses is critical to establish standards of care to help the future offspring, and ensure ongoing public trust.
A First Look at Cepheids in a SN Ia Host with JWST
Creators: name: Yuan, Wenlong
name: Riess, Adam G.
name: Casertano, Stefano
name: Macri, Lucas M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the first look at extragalactic Cepheid variables with the James Webb Space Telescope, obtained from a serendipitous (to this purpose) observation of NGC 1365, host of an SN Ia (SN 2012fr), a calibration path used to measure the Hubble constant. As expected, the high-resolution observations with NIRCam through F200W show better source separation from line-of-sight companions than HST images at similar near-infrared wavelengths, the spectral region that has been used to mitigate the impact of host dust on distance measurements. Using the standard star P330E as a zeropoint and PSF reference, we photometered 31 previously-known Cepheids in the JWST field, spanning 1.15 < log P < 1.75 including 24 Cepheids in the longer period interval of 1.35 < log P < 1.75. We compared the resultant Period-Luminosity relations to that of 49 Cepheids in the full period range including 38 in the longer period range observed with WFC3/IR on HST and transformed to the JWST photometric system (F200W, Vega). The P-L relations measured with the two space telescopes are in good agreement, with intercepts (at log P=1) of 25.74+/-0.04 and 25.72+\-0.05 for HST and JWST, respectively. Our baseline result comes from the longer period range where the Cepheids have higher signal-to-noise ratios where we find 25.75+\-0.05 and 25.75+\-0.06 mag for HST and JWST, respectively. We find good consistency between this first JWST measurement and HST, and no evidence that HST Cepheid photometry is "biased bright" at the ~0.2 mag level that would be needed to mitigate the Hubble Tension, though comparisons from more SN hosts are warranted and anticipated. We expect future JWST observations to surpass these in quality as they will be optimized for measuring Cepheids.
description: 11 pages, 4 figures
Convex and Scalable Weakly Labeled SVMs
Creators: name: Li, Yu-Feng
name: Tsang, Ivor W.
name: Kwok, James T.
name: Zhou, Zhi-Hua
Publisher: name: arXiv
Year: 2013
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this paper, we study the problem of learning from weakly labeled data, where labels of the training examples are incomplete. This includes, for example, (i) semi-supervised learning where labels are partially known; (ii) multi-instance learning where labels are implicitly known; and (iii) clustering where labels are completely unknown. Unlike supervised learning, learning with weak labels involves a difficult Mixed-Integer Programming (MIP) problem. Therefore, it can suffer from poor scalability and may also get stuck in local minimum. In this paper, we focus on SVMs and propose the WellSVM via a novel label generation strategy. This leads to a convex relaxation of the original MIP, which is at least as tight as existing convex Semi-Definite Programming (SDP) relaxations. Moreover, the WellSVM can be solved via a sequence of SVM subproblems that are much more scalable than previous convex SDP relaxations. Experiments on three weakly labeled learning tasks, namely, (i) semi-supervised learning; (ii) multi-instance learning for locating regions of interest in content-based information retrieval; and (iii) clustering, clearly demonstrate improved performance, and WellSVM is also readily applicable on large data sets.
Radiation reaction from QED: lightfront perturbation theory in a plane wave background
Creators: name: Ilderton, Anton
name: Torgrimsson, Greger
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We derive dynamical, real time radiation reaction effects from lightfront QED. Combining the Hamiltonian formalism with a plane wave background field, the calculation is performed in the Furry picture for which the background is treated exactly while interactions between quantum fields are treated in perturbation theory as normal. We work to a fixed order in perturbation theory, but no other approximation is made. The literature contains many proposals for the correct classical equation describing a radiating particle; we take the classical limit of our results and identify which equations are consistent with QED.
description: 33 pages, 5 pdf figures. Version 3: corrected typographical mistakes and presentation issues in equations 4.10--4.14 and accompanying discussion. Results and conclusions unaffected and unchanged
Photonics-assisted analog wideband self-interference cancellation for in-band full-duplex MIMO systems with adaptive digital amplitude and delay pre-matching
Creators: name: Shi, Taixia
name: Chen, Yang
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A photonics-assisted analog wideband RF self-interference (SI) cancellation and frequency downconversion approach for in-band full-duplex (IBFD) multiple-input multiple-output (MIMO) systems with adaptive digital amplitude and delay pre-matching is proposed based on a dual-parallel Mach-Zehnder modulator (DP-MZM). In each MIMO receiving antenna, the received signal, including different SI signals from different transmitting antennas and the signal of interest, is applied to one arm of the upper dual-drive Mach-ehnder modulator (DD-MZM) of the DP-MZM, the reference signal is applied to the other arm of the upper DD-MZM, and the local oscillator signal is applied to the lower DD-MZM. The SI signals are canceled in the optical domain in the upper DD-MZM and the frequency downconversion is achieved after photodetection. To cancel the SI signals, the reference signal is constructed in the digital domain, while the amplitude and delay of the constructed reference are adjusted digitally by upsampling with high accuracy. Experiments are performed when two different SI signals are employed. The genetic algorithm and least-squares algorithm are combined with segmented searching respectively for the SI signal reconstruction and amplitude and delay pre-matching. A cancellation depth of around 20 dB is achieved for the 1-Gbaud 16 quadrature-amplitude modulation orthogonal frequency-division multiplexing signal.
description: 25 pages, 17 figures
Thermal Ringdown of a Kerr Black Hole: Overtone Excitation, Fermi-Dirac Statistics and Greybody Factor
Creators: name: Oshita, Naritaka
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We find a significant destructive interference among Kerr overtones in the early ringdown induced by an extreme mass-ratio merger of a massive black hole and a compact object, and that the ringdown spectrum apparently follows the Fermi-Dirac distribution. We numerically compute the spectral amplitude of gravitational waves induced by a particle plunging into a Kerr black hole and study the excitation of multiple quasi-normal (QN) modes. We find that the start time of ringdown is before the strain peak of the signal and corresponds to the time when the particle passes the photon sphere. When the black hole has the near-extremal rotation, the Kerr QN frequencies are close to the fermionic Matsubara frequencies with the Hawking temperature and the chemical potential of the superradiant frequency. We indeed find that the absolute square of the spectral amplitude apparently follows the Fermi-Dirac distribution with the chemical potential of around the real QN frequency of the fundamental mode. Fitting the Boltzmann distribution to the data in higher frequencies, the best-fit temperature is found out to be close to the Hawking temperature, especially for rapid rotations. In the near-extremal limit, the gravitational-wave spectrum exhibits a would-be Fermi degeneracy with the Fermi surface at the superradiant frequency $ω= μ_{\rm H}$. We show that the greybody factor, i.e., the absorption cross section of a black hole, leads to the Fermi-Dirac distribution. As the greybody factor is another no-hair quantity of black holes, this opens a new possibility that we can test general relativity by observationally searching for the Boltzmann distribution in $ω\gtrsim μ_{\rm H}$ without extracting QN modes from ringdown. We could measure the mass and angular momentum of ringing black holes and could probe the Kerr/CFT by measuring the greybody factor imprinted on the ringdown spectrum.
description: 19 pages, 13 figures
Consenting for Molecular Diagnostics
Creators: name: Klitzman, Robert L.
Publisher: name: Columbia University
Year: 2015
Subjects: Molecular diagnosis
Informed consent (Medical law)
Medical ethics
Bioethics

description: The growing use of molecular diagnostics poses a wide range of issues and questions concerning informed consent that researchers, health care providers, and others will increasingly need to address. Molecular diagnostics are advancing more rapidly than our ability to decide how best to respond to their complex medical, ethical, legal, psychological, and social implications. Although some of these issues resemble those posed by prior tests, the newness and ever-faster spread of these tests, the advent of large-scale electronic databases, and the many inherent uncertainties involved present new challenges and dilemmas that require careful attention to determine how best to proceed. Obtaining appropriate informed consent will require considerable resources, which many researchers and providers may not fully appreciate. For example, for whole genome sequencing (WGS)2 and whole exome sequencing (WES), most researchers have indicated that they were willing to spend 30 minutes or less on obtaining informed consent (1). Yet the complexity of the information involved will probably often require significantly longer interactions.
Hyper-runaway and hypervelocity white dwarf candidates in \textit{Gaia} Data Release 3: possible remnants from Ia/Iax supernova explosions or dynamical encounters
Creators: name: Igoshev, Andrei P.
name: Perets, Hagai
name: Hallakoun, Na'ama
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Type Ia and other peculiar supernovae (SNe) are thought to originate from the thermonuclear explosions of white dwarfs (WDs). Some of the proposed channels involve the ejection of a partly exploded WD (e.g. Iax SN remnant) or the companion of an exploding WD at extremely high velocities ($>400$ km\,s$^{-1}$). Characterisation of such hyper-runaway/hypervelocity (HVS) WDs might therefore shed light on the physics and origins of SNe. Here we analyse the \textit{Gaia} DR3 data to search for HVS WDs candidates, and peculiar sub-main-sequence (sub-MS) objects. We retrieve the previously identified HVSs, and find 46 new HVS candidates. Among these we identify two new unbound WDs and two new unbound sub-MS candidates. The remaining stars are hyper-runaway WDs and hyper-runaway sub-MS stars. The numbers and properties of the HVS WD and sub-MS candidates suggest that extreme velocity ejections ($>1000$ km\,s$^{-1}$) can accompany at most a small fraction of type Ia SNe, disfavouring a significant contribution of the D6-scenario to the origin of Ia SNe. The rate of HVS ejections following the hybrid WD reverse-detonation channel could be consistent with the identified HVSs. The numbers of lower-velocity HVS WDs could be consistent with type Iax SNe origin and/or contribution from dynamical encounters. We also searched for HVS WDs related to known SN remnants, but identified only one such candidate.
description: Submitted to the MNRAS
title: Architourism: O ρόλος και η συμβολή της αρχιτεκτονικής στην τουριστική προβολή της Ελλάδας διεθνώς
Creators: name: Λαμπρου Σταματινα
Publisher: name: Technical University of Crete
Year: 2013

description: H χρήση της αρχιτεκτονικής ως εργαλείο για τη διαμόρφωση της εικόνα ενός τόπου (place branding), με απώτερο στόχο να τον καταστήσει τουριστικό πόλο έλξης αποτελεί το θέμα της παρούσας ερευνητικής εργασίας. Ειδικότερα, η εργασία επιχειρεί να διερευνήσει τον τρόπο με τον οποίο η αρχιτεκτονική έχει συμβάλει ως εργαλείο των επίσημων φορέων με στόχο την προώθηση του τουρισμού στην Ελλάδα. Η χρονική περίοδος που μελετάται ορίζεται από το 1929, έτος ίδρυσης του ΕΟΤ οπόταν ουσιαστικά αρχίζει το επίσημο κρατικό ενδιαφέρον για να καταστεί η Ελλάδα δημοφιλής προορισμός για τουρισμό, μέχρι και την περίοδο της Μεταπολίτευσης. Εξετάζεται η παρουσία της αρχιτεκτονικής στα μέσα προβολής που χρησιμοποιήθηκαν, όπως αφίσες , διαφημιστικά φυλλάδια και ελληνικά περίπτερα σε διεθνείς εκθέσεις στο εξωτερικό. Παράλληλα διερευνώνται οι τουριστικές υποδομές, για τις οποίες είχε μεριμνήσει ο ΕΟΤ με χαρακτηριστικότερο το πρόγραμμα ΞΕΝΙΑ, που συνέβαλαν και αυτές στην διαμόρφωση της εικόνας. Τα παραπάνω μέσα θα ερμηνευτούν με βάση το ευρύτερο φαινόμενο Architourism, όπως αυτό παρουσιάστηκε στο βιβλίο Αrchitourism: Architecture as a destination for Tourism , που αναφέρεται στο ομώνυμο συνέδριο το οποίο πραγματοποιήθηκε το 2002 στο πανεπιστήμιο Columbia στη Νέα Υόρκη. Το φαινόμενο Architourism αναφέρεται στη σχέση μεταξύ της Αρχιτεκτονικής και του Τουρισμού. Συγκεκριμένα όταν αυτή χρησιμοποιείται ως «προϊόν» για τουριστική κατανάλωση.
Attitudes and Practices Among Internists Concerning Genetic Testing
Creators: name: Klitzman, Robert L.
name: Chung, Wendy K.
name: Marder, Karen
name: Shanmugham, Anita
name: Chin, Lisa J.
name: Stark, Meredith
name: Leu, Cheng Shiun
name: Appelbaum, Paul S.
Publisher: name: Columbia University
Year: 2013
Subjects: Human chromosome abnormalities--Diagnosis
Physicians--Attitudes
Internists

description: Many questions remain concerning whether, when, and how physicians order genetic tests, and what factors are involved in their decisions. We surveyed 220 internists from two academic medical centers about their utilization of genetic testing. Rates of genetic utilizations varied widely by disease. Respondents were most likely to have ordered tests for Factor V Leiden (16.8 %), followed by Breast/Ovarian Cancer (15.0 %). In the past 6 months, 65 % had counseled patients on genetic issues, 44 % had ordered genetic tests, 38.5 % had referred patients to a genetic counselor or geneticist, and 27.5 % had received ads from commercial labs for genetic testing. Only 4.5 % had tried to hide or disguise genetic information, and <2 % have had patients report genetic discrimination. Only 53.4 % knew of a geneticist/genetic counselor to whom to refer patients. Most rated their knowledge as very/somewhat poor concerning genetics (73.7 %) and guidelines for genetic testing (87.1 %). Most felt needs for more training on when to order tests (79 %), and how to counsel patients (82 %), interpret results (77.3 %), and maintain privacy (80.6 %). Physicians were more likely to have ordered a genetic test if patients inquired about genetic testing (p
title: Η σύγχρονη κατοίκηση στη Γαύδο από την αρχαιότητα μέχρι την έλευση των αδερφών Ξηρού
Creators: name: Αναστασακης Εμμανουηλ
Publisher: name: Technical University of Crete
Year: 2014

description: Σκοπός της ερευνητικής αυτής εργασίας είναι ο εντοπισμός των χαρακτηριστικών και η ανάλυση της μορφολογικής εξέλιξης του παραδοσιακού λαϊκότροπου σπιτιού στο νοτιότερο νησί της Ελλάδος, τη Γαύδο. Η ανάλυση αυτή γίνεται με βάση την ιστορική εξέλιξή της κατοίκησης από τις πρώτες ενδείξεις ζωής στο νησί έως και σήμερα. Οι περίοδοι χρονολογικά θα αναφερθούν σύμφωνα με τις βιβλιογραφικές αναφορές και τις μελέτες που αφορούν το νησί, αλλά και τα δεδομένα που συλλέχθηκαν επί τόπου.
Bulk viscosity of resonantly interacting fermions in the quantum virial expansion
Creators: name: Fujii, Keisuke
name: Enss, Tilman
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We consider two-component fermions with a zero-range interaction both in two and three dimensions and calculate the bulk viscosity for an arbitrary scattering length in the high-temperature regime. We evaluate the Kubo formula for the bulk viscosity using an expansion with respect to the fugacity, which acts as a small parameter at high temperatures. In the zero-frequency limit of the Kubo formula, pinch singularities emerge that reduce the order of the fugacity by one. These singularities can turn higher-order vertex corrections at nonzero frequencies into the leading order at zero frequency, so that all such contributions have to be resummed. We present an exact microscopic computation for the bulk viscosity in the high-temperature regime by taking into account these pinch singularities. For negative scattering lengths, we derive the complete bulk viscosity at second order in fugacity and show that a self-consistent equation to resum the vertex corrections is identical to a linearized kinetic equation. For positive scattering lengths, a new type of pinch singularity arises for bound pairs. We show that the pinch singularity for bound pairs leads to a first-order contribution to the bulk viscosity, which is one order lower than that for negative scattering lengths, and that the vertex corrections also provide first-order contributions. We propose a new kinetic equation for bound pairs that derives from a self-consistent equation to resum the vertex corrections.
description: 27 pages, 11 figures
title: Cash and COVID-19: The Effects of Lifting Containment Measures on Cash Demand and Use
Creators: name: Chen, Heng
name: Engert, Walter
name: Huynh, Kim
name: Nicholls, Gradon
name: Zhu, Julia
Publisher: name: Bank of Canada
Year: 2021

description: Using Bank Note Distribution System data on the demand for cash up to September 2020, we find that demand was strong. This is true even though cash use for payments declined early in the pandemic. When mobility restrictions and lockdown measures were eased, cash use for payments increased sharply but remained less popular than electronic methods of payment.

description: D’après notre analyse, les données du Système de distribution des billets de banque sur la demande d’espèces compilées jusqu’en septembre 2020 montrent que cette demande a été vigoureuse, même si les paiements en argent comptant ont diminué au tout début de la pandémie. Quand les restrictions applicables aux déplacements et les mesures de confinement ont été assouplies, les paiements en argent comptant ont augmenté en flèche, mais sont restés moins populaires que les paiements électroniques.
Event horizons are tunable factories of quantum entanglement
Creators: name: Agullo, Ivan
name: Brady, Anthony J.
name: Kranas, Dimitrios
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: That event horizons generate quantum correlations via the Hawking effect is well known. We argue, however, that the creation of entanglement can be modulated as desired, by appropriately illuminating the horizon. We adapt techniques from quantum information theory to quantify the entanglement produced during the Hawking process and show that, while ambient thermal noise (e.g., CMB radiation) degrades it, the use of squeezed inputs can boost the non-separability between the interior and exterior regions in a controlled manner. We further apply our ideas to analog event horizons concocted in the laboratory and insist that the ability to tune the generation of entanglement offers a promising route towards detecting quantum signatures of the elusive Hawking effect.
description: Honorable mention for Gravity Research Foundation 2022 Awards for Essays on Gravitation. Comments welcome. (14 pages + 3 figures)
Current-driven writing process in antiferromagnetic Mn2Au for memory applications
Creators: name: Reimers, Sonka
name: Lytvynenko, Yaryna
name: Niu, Yuran
name: Golias, Evangelos
name: Sarpi, Brice
name: Ishibe-Veiga, Larissa
name: Denneulin, Thibauld
name: Kovacs, Andras
name: Dunin-Borkowski, Rafal
name: Bläßer, Jonathan
name: Kläui, Mathias
name: Jourdan, Martin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Current pulse driven Neel vector rotation in metallic antiferromagnets is one of the most promising concepts in antiferromagnetic spintronics. We show microscopically that the Neel vector of epitaxial thin films of the prototypical compound Mn2Au can be reoriented reversibly in the complete area of cross shaped device structures using single current pulses. The resulting domain pattern with aligned staggered magnetization is long term stable enabling memory applications. We achieve this switching with low heating of 20 K, which is promising regarding fast and efficient devices without the need for thermal activation. Current polarity dependent reversible domain wall motion demonstrates a Neel spin-orbit torque acting on the domain walls.
description: 9 pages, 9 figures
Influence of Reheating on the Trispectrum and its Scale Dependence
Creators: name: Leung, Godfrey
name: Tarrant, Ewan R. M.
name: Byrnes, Christian T.
name: Copeland, Edmund J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the evolution of the non-linear curvature perturbation during perturbative reheating, and hence how observables evolve to their final values which we may compare against observations. Our study includes the evolution of the two trispectrum parameters, $\gnl$ and $\taunl$, as well as the scale dependence of both $\fnl$ and $\taunl$. In general the evolution is significant and must be taken into account, which means that models of multifield inflation cannot be compared to observations without specifying how the subsequent reheating takes place. If the trispectrum is large at the end of inflation, it normally remains large at the end of reheating. In the classes of models we study, it is very hard to generate $\taunl\gg\fnl^2$, regardless of the decay rates of the fields. Similarly, for the classes of models in which $\gnl\simeq\taunl$ during slow--roll inflation, we find the relation typically remains valid during reheating. Therefore it is possible to observationally test such classes of models without specifying the parameters of reheating, even though the individual observables are sensitive to the details of reheating. It is hard to generate an observably large $\gnl$ however. The runnings, $\nfnl$ and $\ntaunl$, tend to satisfy a consistency relation $\ntaunl=(3/2)\nfnl$, but are in general too small to be observed for the class of models considered regardless of reheating timescale.
description: 17 pages, 8 figures. v2: minor changes to match the published JCAP version
title: Ταυτοποίηση οικογενειών πετρελαίου στη λεκάνη Williston του Καναδά με οργανική γεωχημική ανάλυση
Creators: name: Γλαρου Αικατερινη
Publisher: name: Technical University of Crete
Year: 2015

description: Η λεκάνη Williston της Βόρειας Αμερικής αποτελεί μία περιοχή μεγάλου ενδιαφέροντος στην εξερεύνηση και παραγωγή πετρελαίου. Αποτελείται από ορίζοντες παραγωγής πετρελαίου σε πολλούς σχηματισμούς του Φανεροζωικού, όπου τα πετρέλαια εμφανίζονται σε υπόγειες παγίδες ανάμεσα στις εναλλαγές των στρωμάτων. Στη λεκάνη έχουν αναγνωριστεί 6 κύριες οικογένειες πετρελαίων (A, B, C, D, E, F) καθώς και αρκετές υποομάδες τους, σαν αποτέλεσμα των πολυάριθμων γεωλογικών και γεωχημικών ερευνών.
Σκοπός  της παρούσας εργασίας είναι η αναζήτηση των στοιχείων σύστασης των πετρελαίων τα οποία μπορούν να επιβεβαιώσουν την ταξινόμηση τους στις προαναφερθείσες οικογένειες. Συνολικά αναλύθηκαν 20 δείγματα από 5 οικογένειες (A, B, C, D, E). Η γεωχημική ανάλυση περιλαμβάνει τη χρωματογραφία ανοικτής στήλης, την αέρια χρωματογραφία-φασματοσκοπία μάζας (GC-MS) και την υπέρυθρη φασματοσκοπία (FT-IR).  Υπολογίστηκαν οι περιεκτικότητες σε κορεσμένους και αρωματικούς υδρογονάνθρακες, οι συγκεντρώσεις βιοδεικτών και επιλεγμένοι γεωχημικοί δείκτες. Αρκετοί δείκτες αποδείχθηκαν ικανοί να επιβεβαιώσουν την ταξινόμηση των δειγμάτων στις αντίστοιχες οικογένειες. Ενδεικτικά αναφέρουμε ότι η οικογένεια Α ξεχωρίζει με τους λόγους Ph/nC18 και nC24+/nC24-, η οικογένεια Β με το λόγο nC24+/nC24-, η οικογένεια C με το λόγο Pr/nC17 ενώ η οικογένεια Ε εμφανίζει τη μικρότερη περιεκτικότητα σε ελαφρούς και κορεσμένους υδρογονάνθρακες.
Τέλος χρησιμοποιήθηκε η τεχνική της ιεραρχικής ταξινόμησης των δειγμάτων πετρελαίου με χρήση Matlab, με βάση διαφορετικά στοιχεία σύστασης για την οπτικοποίηση των αναλυτικών αποτελεσμάτων, η οποία έδωσε δενδρογράμματα με ικανοποιητικό διαχωρισμό ανάμεσα στα δείγματα του πετρελαίου των διαφορετικών οικογενειών.
Quadratic Enhancement in the Reliability of Collective Quantum Engines
Creators: name: Jaseem, Noufal
name: Vinjanampathy, Sai
name: Mukherjee, Victor
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study fluctuations in many-body quantum heat engines operating in the presence of collective system-bath interactions. We show that collective effects in open quantum systems can be harnessed to develop highly consistent many-body quantum engines. We consider quantum Otto engines, modeled by $n$ spins collectively coupled to thermal baths. Our results show that collective effects can significantly reduce the fluctuations in the output work, quantified by high reliability ($r$) and low thermodynamic uncertainty. In contrast to independent engines, we demonstrate a quadratic enhancement of the reliability $r$ for their collective counterparts. We extend our analysis to the case of interacting spin models commonly studied in many-body physics, such as the Lipkin-Meshkov-Glick (LMG) model, thereby broadening the regime of applicability of collective effects in quantum thermal machines significantly. This paves the way forward for realistic collective quantum thermal machines in many body systems.
description: 4.5 pages, 1 figure
Structure and evolution of ultra-massive white dwarfs in general relativity
Creators: name: Althaus, L. G.
name: Camisassa, M. E.
name: Torres, S.
name: Battich, T.
name: Corsico, A. H.
name: Rebassa-Mansergas, A.
name: Raddi, R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present the first set of constant rest-mass ultra-massive oxygen/neon white dwarf cooling tracks with masses larger than 1.29 Msun which fully take into account the effects of general relativity on their structural and evolutionary properties. We have computed the full evolution sequences of 1.29, 1.31, 1.33, 1.35, and 1.369 Msun white dwarfs with the La Plata stellar evolution code, LPCODE. For this work, the standard equations of stellar structure and evolution have been modified to include the full effects of general relativity. For comparison purposes, the same sequences have been computed but for the Newtonian case. According to our calculations, the evolutionary properties of the most massive white dwarfs are strongly modified by general relativity effects. In particular, the resulting stellar radius is markedly smaller in the general relativistic case, being up to 25% smaller than predicted by the Newtonian treatment for the more massive ones. We find that oxygen/neon white dwarfs more massive than 1.369 Msun become gravitationally unstable with respect to general relativity effects. When core chemical distribution due to phase separation on crystallization is considered, such instability occurs at somewhat lower stellar masses, greater than 1.36 Msun. In addition, cooling times for the most massive white dwarf sequences result in about a factor of two smaller than in the Newtonian case at advanced stages of evolution. Finally, a sample of white dwarfs has been identified as ideal candidates to test these general relativistic effects. We conclude that the general relativity effects should be taken into account for an accurate assessment of the structural and evolutionary properties of the most massive white dwarfs.
description: 12 pages, accepted for publication in Astronomy and Astrophysics
title: Σύγκριση ακρίβειας πρόβλεψης και αξιολόγηση μεθόδων υπολογισμού πυκνότητας πετρελαίων σε συνθήκες ταμιευτήρων.
Creators: name: Karimi Masood
Publisher: name: Technical University of Crete
Year: 2015

description: Στην Μηχανική Ταμιευτήρων η τιμή της πυκνότητας σε συνθήκες ταμιευτήρα, είναι κρίσιμη ιδιότητα διότι προσδιορίζει τη θέση των ρευστών στο πορώδες μέσο, την απόδοση των μεθόδων ανάκτησης, τις πιέσεις που επικρατούν στα διάφορα σημεία του ταμιευτήρα, την αναγκαιότητα ή μη εφαρμογής μεθόδων τεχνητής άντλησης, όπως επίσης και διάφορων άλλων παραμέτρων που χρειάζονται για τους υπολογισμούς της Μηχανικής Ταμιευτήρων και Παραγωγής Πετρελαίου όπως η προσομοίωση του ταμιευτήρα, η μοντελοποίηση της ροής στο πορώδες μέσο, ο υπολογισμός αποθεμάτων, κλπ. Ακόμα η πυκνότητα των ρευστών δεν είναι σταθερή κατά την διάρκεια της εκμετάλλευσης. Έχει άμεση σχέση με την πίεση, την θερμοκρασία και τη σύσταση τους. Για τους παραπάνω λόγους μια ακριβής εκτίμηση της πυκνότητας αποτελεί μείζονος σημασίας για την Μηχανική Ταμιευτήρων και Παραγωγής Πετρελαίου.
Το αντικείμενο της παρούσας εργασίας είναι η σύγκριση ακρίβειας πρόβλεψης διαφόρων μεθόδων εκτίμησης/υπολογισμού της πυκνότητας πετρελαίων σε συνθήκες ταμιευτήρων με έμφαση στη χρήση όσο το δυνατόν λιγότερων διαθέσιμων δεδομένων όπως συμβαίνει κατά τα πρώτα στάδια της έρευνας. Οι διάφορες αυτές μέθοδοι μπορούν να διακριθούν σε δύο μεγάλες κατηγορίες: τα εμπειρικά μοντέλα και τα μοντέλα με θεωρητικό υπόβαθρο. Στην πρώτη κατηγορία ανήκουν οι σχέσεις/εξισώσεις οι οποίες βασίζονται σε δεδομένα παραγωγής. Στην δεύτερη κατηγορία ανήκουν οι καταστατικές εξισώσεις που απορρέουν από την θεωρία των ιδανικών αερίων και χρησιμοποιούν πειραματικά δεδομένα σύστασης και χαρακτηρισμού των ρευστών για την ανάπτυξη τους. Για το λόγο αυτό, στην παρούσα διπλωματική εργασία εκτός από την σύγκριση ακρίβειας πρόβλεψης των διαφόρων μεθόδων υπολογισμού της πυκνότητας γίνεται και εκτεταμένη ανάλυση ως προς την επιρροή που έχουν οι τυχόν αποκλίσεις των πειραματικών μετρήσεων και των δεδομένων παραγωγής. Η επιρροή αυτή εξετάζεται με την χρήση της παραγώγου της πυκνότητας ως προς τα δεδομένα αυτά.
ECADOC Lausanne 2016: Final Evaluation Report
Creators: name: Reid, Hazel
Publisher: name: Network for Innovation in Guidance and Counselling in Europe (NICE)
Year: 2017

description: External Evaluation Report on the third ECADOC Summer School, which took place at the University of Lausanne from September 5-10, 2016
description: NICE Newsletter, No 1 (2017)
Fertile metastability
Creators: name: Pieranski, P.
name: Godinho, M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We deal here with three metastable systems: 1{\textdegree}- the dowser texture, 2{\textdegree}- supertwistedcholesterics and 3{\textdegree}- hypotwisted cholesterics. We outline remarkable properties of tropisms of the dowser texture stemming from its low symmetry and we show that, using setups called Dowsons Colliders, nematic monopoles can be nucleated, set into motion and brought into collisions in the dowser texture. Subsequently we point out that nucleation of dislocation loops occurs in cholesteric layers compressed or dilated between cylindrical mica sheets. Under compression, three modes of nucleation of dislocation loops have been identified: individual, serial and continuous. The serial mode generates dislocation nets made of L circular loops connected by C radial crossing into superloops. Similar superloops can also be generated under dilation. We analyse the topology of superloops in terms of the theory of knots and point out they can be reduced into the unknot by Reidemeister moves. In other words, superloops are multiply folded loops that can be continuously unfolded.
Non-invertible Time-reversal Symmetry
Creators: name: Choi, Yichul
name: Lam, Ho Tat
name: Shao, Shu-Heng
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In gauge theory, it is commonly stated that time-reversal symmetry only exists at $θ=0$ or $π$ for a $2π$-periodic $θ$-angle. In this paper, we point out that in both the free Maxwell theory and massive QED, there is a non-invertible time-reversal symmetry at every rational $θ$-angle, i.e., $θ= πp/N$. The non-invertible time-reversal symmetry is implemented by a conserved, anti-linear operator without an inverse. It is a composition of the naive time-reversal transformation and a fractional quantum Hall state. We also find similar non-invertible time-reversal symmetries in non-Abelian gauge theories, including the $\mathcal{N}=4$ $SU(2)$ super Yang-Mills theory along the locus $|τ|=1$ on the conformal manifold.
description: 30 pages
title: Πιθανοκρατική ανάλυση ευστάθειας εδαφικών πρανών
title: Probabilistic slope stability analysis
Creators: name: Χαραλαμποπουλος Νικολαος
Publisher: name: Technical University of Crete
Year: 2015

description: Ο συντελεστής ασφαλείας εδαφικών πρανών συνήθως υπολογίζεται στην πράξη με τη μέθοδο οριακής ισορροπίας ή άλλη όπως λ.χ. υπολογιστικής μεθόδου πεπερασμένων στοιχείων κ.λπ., θεωρώντας τις μέσες τιμές των παραμέτρων συνοχής και μοναδιαίου βάρους του εδάφους αλλά και των φορτίων που τείνουν να προκαλέσουν την αστοχία (εξωτερικά επιβαλλόμενα φορτία, υπόγειο ύδωρ, σεισμικά φορτία κ.λπ.). Όμως όλες οι παράμετροι αυτές στην πραγματικότητα επιδεικνύουν κάποια διακύμανση και ακολουθούν κάποια στατιστική κατανομή γύρω από την μέση τιμή, που μπορεί να έχει μεγάλη επίδραση στον υπολογισμό του συντελεστού ασφαλείας. Επίσης μπορεί να επιδεικνύουν και συσχέτιση στο χώρο. Στην παρούσα εργασία εξετάζουμε την επίδραση της ακτίνας χωρικής συσχέτισης εκθετικού μοντέλου συσχέτισης της συνοχής και γωνίας εσωτερικής τριβής στον συντελεστή ασφαλείας συγκεκριμένου εδαφικού πρανούς με την υπολογιστική μέθοδο των τυχαίων πεπερασμένων στοιχείων. Καταδεικνύεται ότι η ακτίνα συσχέτισης στο χώρο έχει μεγάλη επίδραση στην στατιστική κατανομή των συντελεστών ασφαλείας. H επίδραση αυτή μπορεί να εκφρασθεί με την βοήθεια της έννοιας του δείκτη αξιοπιστίας.
description: Τhe Factor of Safety of slopes is usually computed using Limit Equilibrium method or computational Finite Element method considering only the “average” or mean properties. In fact, all of these properties exhibit a distribution about the mean, or spatial correlation even under the most ideal conditions, and these distributions can have a significant impact upon the design calculations. Ηere we examine the influence of the scale of fluctuation or range of correlation of an exponential correlation model of the cohesion and friction angle of a soil on the factor of safety by using the method of random finite elements. It is shown that the correlation range has a significant impact on the form of the statistical distribution of the factor of safety. This effect may be quantitatively expressed with the aid of the concept of the reliability index.
On the Choquet-Bruhat-York-Friedrich formulation of the Einstein-Euler equations
Creators: name: Disconzi, Marcelo M.
name: Pingali, Vamsi P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Short-time existence for the Einstein-Euler and the vacuum Einstein equations is proven using a Friedrich inspired formulation due to Choquet-Bruhat and York, where the system is cast into a symmetric hyperbolic form and the Riemann tensor is treated as one of the fundamental unknowns of the problem. The reduced system of Choquet-Bruhat and York, along with the preservation of the gauge, is shown to imply the full Einstein equations.
A Gibbons-Penrose inequality for surfaces in Schwarzschild spacetime
Creators: name: Brendle, Simon
name: Wang, Mu-Tao
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We propose a geometric inequality for two-dimensional spacelike surfaces in the Schwarzschild spacetime. This inequality implies the Penrose inequality for collapsing dust shells in general relativity, as proposed by Penrose and Gibbons. We prove that the inequality holds in several important cases.
description: 11 pages. Final version. To appear in Communications in Mathematical Physics