cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ancient Very Metal-Poor Stars Associated With the Galactic Disk in the H3 Survey
Creators: name: Carter, Courtney
name: Conroy, Charlie
name: Zaritsky, Dennis
name: Ting, Yuan-Sen
name: Bonaca, Ana
name: Naidu, Rohan
name: Johnson, Benjamin
name: Cargile, Phillip
name: Caldwell, Nelson
name: Speagle, Josh
name: Han, Jiwon Jesse
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Ancient, very metal-poor stars offer a window into the earliest epochs of galaxy formation and assembly. We combine data from the H3 Spectroscopic Survey and Gaia to measure metallicities, abundances of $α$ elements, stellar ages, and orbital properties of a sample of 482 very metal-poor (VMP; [Fe/H]$70% of VMP stars near the disk are on prograde orbits and this fraction increases toward lower metallicities. This result unexpected if metal-poor stars are predominantly accreted from many small systems with no preferred orientation, as such a scenario would imply a mostly isotropic distribution. Furthermore, we find there is some evidence for higher fractions of prograde orbits amongst stars with lower [$α$/Fe]. Isochrone-based ages for main sequence turn-off stars reveal that these VMP stars are uniformly old ($\approx12$ Gyr) irrespective of the $α$ abundance and metallicity, suggesting that the metal-poor population was not born from the same well-mixed gas disk. We speculate that the VMP population has a heterogeneous origin, including both in-situ formation in the ancient disk and accretion from a satellite with the same direction of rotation as the ancient disk at early times. Our precisely measured ages for these VMP stars on prograde orbits show that the Galaxy has had a relatively quiescent merging history over most of cosmic time, and implies the angular momentum alignment of the Galaxy has been in place for at least 12 Gyr.
description: 9 pages, 4 figures, accepted to ApJ
Three-quarter Sibling Regression for Denoising Observational Data
Creators: name: Shankar, Shiv
name: Sheldon, Daniel
name: Sun, Tao
name: Pickering, John
name: Dietterich, Thomas G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Many ecological studies and conservation policies are based on field observations of species, which can be affected by systematic variability introduced by the observation process. A recently introduced causal modeling technique called 'half-sibling regression' can detect and correct for systematic errors in measurements of multiple independent random variables. However, it will remove intrinsic variability if the variables are dependent, and therefore does not apply to many situations, including modeling of species counts that are controlled by common causes. We present a technique called 'three-quarter sibling regression' to partially overcome this limitation. It can filter the effect of systematic noise when the latent variables have observed common causes. We provide theoretical justification of this approach, demonstrate its effectiveness on synthetic data, and show that it reduces systematic detection variability due to moon brightness in moth surveys.
Increasing training impact through project-based learning
Creators: name: Emery, Laura
name: Morgan, Sarah
Publisher: name: F1000Research
Year: 2015

description: Bioinformatics training is critical to ensuring life scientists are able to analyse and add meaning to their data. Developing training courses that are relevant to an increasingly heterogeneous audience is, however, challenging. To address this we redesigned our 2014 Bioinformatics Summer School to include a group project-based learning component. Here we explore the impact of this approach.
Physical controls on the distribution of contaminants on Sturgeon Bank, Fraser River Delta, British Columbia
Creators: name: Feeney, Tracey Dawn
Publisher: name: University of British Columbia
Year: 2009

description: The physical controls on the distribution of contaminants on the environmentally sensitive Sturgeon Bank tidal flat of the Fraser River delta is being studied to define the locations of erosion and deposition, and migration pathways of sediment and associated contaminants. Sediment erodibility was measured at 10 sites using an insitu benthic annular flume called the Sea Carousel. At each site, InterOcean S4 current meters were also deployed for one month to determine current speed and direction, and suspended sediment concentrations were measured twice weekly for 2 months. Grain size analysis was performed on sediments collected from these 10 sites and an additional 56 sites. The 56 sites were also analyzed for major and minor element composition. Sea Carousel data reveal that sediments on the inner bank are not suspended by the current velocities measured at these stations due to surface cohesion in finegrained material. Unlike the inner bank, sediments on the outer bank are suspended by waveinduced currents and in some cases tidal currents, especially in the fine sand-dominated sediments on the outer southern area of the bank. Eroded sediments from this area appear to be transported shoreward. Current meter data reveal that currents are variable both spatially and temporally on the bank. In general, flow is bidirectional with flooding currents on the outer bank (seaward) having higher average velocities. Currents on the inner bank (shoreward) show no consistent orientation of peak velocities. Suspended sediment data show an increase in concentration shoreward and a marked increase as wave height increases. Geochemical results reveal that surface sediments on Sturgeon Bank show very little contamination in Pb, Cu, Zn, Ni, Cr and V. The distribution of these elements on Sturgeon Bank is controlled primarily by sediment texture and physical controls on sediment transport. The coarse-grained nature relatively low clay content of sediments on the bank result in a decreased accumulation of minor elements. Cobalt concentrations are unusually high in some surface sediments, a result not explainable in the scope of this study. Results indicate that contaminated sediments known to have been deposited in the past on Sturgeon Bank due to sewage discharge are not present at the surface. This probably reflects more recent deposition of less contaminated sediments transported from the Fraser River distributaries and/or deposition of sediments resuspended from the outer bank which have been transported shoreward.
De novo assembly pipeline for transcriptomic analysis
Creators: name: Meng, Arnaud
name: Bittner, Lucie
name: Annamale, Anita
name: Not, Fabrice
name: Corre, Erwan
name: Crom, Stéphane Le
Publisher: name: F1000Research
Year: 2015

description: High-throughput sequencing technologies generate unprecedented amounts of genomic data. These recent methodological breakthrough are particularly interesting to study the biology of non-culturable organisms for which there is no reference genome. This is the case for many of the marine planktonic organisms, in which symbiotic interactions between microalgae and a predator host (photosymbiosis) are frequently observed but remains poorly known. Our works propose the establishment of an original de novo assembly method for RNA-Seq data and the exploration of transcriptome. More specifically we will apply our methods to the study of the photosymbiosis processes in the marine plankton. The RNA-Seq de novo assembly allow to reconstruct most of the transcripts of an organism from its sequenced transcriptome. Our pipeline is based on this technique and process the analysis to carry out the exploration of the transcriptome and the annotation of the studied species. The originality of our program lies in its ability to merge the transcriptomes reconstituted by two different assembly programs (Trinity and Velvet / Oases), in order to take the best of both assemblers for a given dataset of raw sequences. We have tested our pipeline on an existing transcriptome from yeast to validate its performance. The success of the validation step led us to its application on RNA-Seq data in the context of the investigation on photosymbiosis in the marine plankton. Using our program we reconstructed the transcriptomes of four symbiotic microalgaes. The exploration of transcriptomes from the holobiont (mix host + symbiont) is still in progress. We developed a new methods to explored the transcriptomes of the symbiotic microalgae. This methods, based on sequence similarity networks applied to RNA-Seq data aims at classify sequences and having a support for partitioning our downstream analyzes on restreint groups of sequences. Ultimately, our analysis will promote the understanding of processes involved in marine photosymbiosis.
Edge Localized Schrödinger Cat States in Finite Lattices via Periodic Driving
Creators: name: Bhuiyan, Asadullah
name: Marsiglio, Frank
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Floquet states have been used to describe the impact of periodic driving on lattice systems, either using a tight-binding model, or by using a continuum model where a Kronig-Penney-like description has been used to model spatially periodic systems in one dimension. A number of these studies have focused on finite systems, and results from these studies are distinct from those of infinite lattice systems as a consequence of boundary effects. In the case of a finite system, there remains a discrepancy in the results between tight-binding descriptions and continuous lattice models. Periodic driving by a time-dependent field in tight-binding models results in a collapse of all quasienergies within a band at special driving amplitudes. In the continuum model, on the other hand, a pair of nearly-degenerate edge bands emerge and remain gapped from the bulk bands as the field amplitude increases. We resolve these discrepancies and explain how these edge bands represent Schrödinger cat-like states with effective tunneling across the entire lattice. Moreover, we show that these extended cat-like states become perfectly localized at the edge sites when the external driving amplitude induces a collapse of the bulk bands.
description: 16 pages, 13 figures, 3 appendices
Effects of non-denumerable fixed points in finite dynamical systems
Creators: name: Chakraborty, Sagar
name: Bhattacharjee, J. K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The motion of a spinning football brings forth the possible existence of a whole class of finite dynamical systems where there may be non-denumerably infinite number of fixed points. They defy the very traditional meaning of the fixed point that a point on the fixed point in the phase space should remain there forever, for, a fixed point can evolve as well! Under such considerations one can argue that a free-kicked football should be non-chaotic.
description: This paper is a replaced version to modify the not-so-true claim, made unknowingly in the earlier version, of being first to propose the peculiar dynamical systems as described in the paper. With respect to the original workers, we present here our original findings
Οι θεωρίες μακρών κυμάτων και η σύνδεση τους με τις οικονομικές κρίσεις:
Creators: name: Παπαγιάννης, Ιωάννης Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Μακρά κύματα
Οικονομικοί κύκλοι
Οικονομικές κρίσεις
Long waves
Economic cycles
Economic crises

description: Σκοπός της διατριβής ήταν η μελέτη των μακρών κυμάτων και η σχέση τους με τις οικονομικές κρίσεις. Αρχικά αναλύσαμε τις βασικές θεωρίες των μακρών κυμάτων και την σχέση τους με τις οικονομικές κρίσεις. Στη συνέχεια μέσω διαγραμμάτων εξετάσαμε αν η οικονομική πραγματικότητα επιβεβαιώνει τις θεωρίες αυτές. Τα δεδομένα μας αφορούν την οικονομία των ΗΠΑ από το 1790-2012. Μελετήσαμε τους οικονομικούς κύκλους σε σχέση με τις καινοτομίες, το ποσοστό του κέρδους και την ανισοκατανομή του εισοδήματος στην κοινωνία.
description: Τhe purpose of this dissertation was to study the relationship between the long waves and economic crises. First we discussed the basic theories of long waves and their relationship with economic crisis. Then with the use of diagrams we examined if the economic reality confirms these theories. Our data are about USA from 1790-2012. We studied the economic cycles in relation with innovations, profit rate and inequality of income in the society.
Διερεύνηση των απόψεων των μαθητών για τα χαρακτηριστικά της προσωπικότητας των καθηγητών στο λύκειο που επηρεάζουν την εκπαιδευτική διαδικασία
Creators: name: Γιαννακόπουλος, Χαράλαμπος Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: εκπαιδευτικός
μαθητές
προσωπικότητα
teacher
students
personality

description: Στη συγκεκριμένη διπλωματική εργασία θα γίνει λεπτομερής αναφορά στις απόψεις που έχουν οι μαθητές του Λυκείου για τη προσωπικότητα των εκπαιδευτικών τους που επηρεάζει την εκπαιδευτική διαδικασία, όπως ορίζει και το θέμα («Η διερεύνηση των απόψεων των μαθητών για τα χαρακτηριστικά της προσωπικότητας των καθηγητών στο Λύκειο που επηρεάζουν την εκπαιδευτική διαδικασία»). Αρχικά, στο πρώτο, το θεωρητικό μέρος, παρατίθενται αποτελέσματα παλαιοτέρων ερευνών ως ιστορική ανασκόπηση του προβληματισμού που από τη δεκαετία του 1960 φαίνεται να υπήρχε και να αποτέλεσε αφορμή έναρξης ερευνών, ώστε να μελετηθεί ο παράγοντας σχολείο και κυρίως του αποτελεσματικού σχολείου στην απόδοση των μαθητών. Με τον τρόπο αυτό γίνεται κατανοητό το θεωρητικό κομμάτι της εργασίας, ώστε επισημαίνοντας τις έννοιες που διέπουν το νόημα του τίτλου της εργασίας, να παρουσιαστεί η μεθοδολογική έρευνα. Στο δεύτερο μέρος της μεθοδολογίας επικεντρώνομαι στην άποψη των μαθητών του Λυκείου και των δύο φύλων, αγόρια, κορίτσια. Διεξήχθη ποσοτική έρευνα με διανομή ερωτηματολογίου σε καθέναν από τους 105 μαθητές της Α’ τάξης του 4ου Γενικού Λυκείου της Κοζάνης.Το ερωτηματολόγιο παρουσιάζεται με τη μορφή που διανεμήθηκε στο «ΠΑΡΑΡΤΗΜΑ» της τελευταίας σελίδας της συγκεκριμένης εργασίας. Τα συμπεράσματα έπειτα από τη σχετική μελέτη των απαντήσεων των μαθητών σχετικά με τη προσωπικότητα του εκπαιδευτικού που επηρεάζει και καθορίζει τη δράση και την αποδοτικότητά του αναλύονται στο τελευταίο κεφάλαιο της εργασίας.
description: Συγκεκριμένα, στο πρώτο κεφάλαιο γίνεται μία εισαγωγική αναφορά, ώστε από το δεύτερο κεφάλαιο να ξεκινήσει η αποσαφήνιση των βασικών εκπαιδευτικών όρων της εκπαίδευσης, της παιδαγωγικής, της αγωγής και της διδασκαλίας. Στο τρίτο, αναλύονται οι τάσεις και συμπεριφορές των εκπαιδευτικών εντός της σχολικής τάξης και στο τέταρτο κεφάλαιο οι παράγοντες που καθορίζουν την εκπαιδευτική αποτελεσματικότητα. Η βιβλιογραφική ανασκόπηση κορυφώνεται στο πέμπτο κεφάλαιο με αναφορά στα χαρακτηριστικά της προσωπικότητας του αποτελεσματικού εκπαιδευτικού από τη σκοπιά των μαθητών του Λυκείου, σύμφωνα με παλαιότερες έρευνες. Στο έκτο κεφάλαιο της μεθοδολογίας κατατίθενται ο σκοπός, το δείγμα της προσωπικής μου έρευνας και τα ερευνητικά εργαλεία. Στο έβδομο κεφάλαιο γίνεται μία κριτική ανάλυση των αποτελεσμάτων της έρευνάς μου σε σύγκριση με τις απόψεις που κατατέθηκαν στα κεφάλαια της εργασίας που προηγήθηκαν. Στο όγδοο και τελευταίο κεφάλαιο των συμπερασμάτων αποσαφηνίζονται τα στατιστικά αποτελέσματα και ερμηνεύονται τα αποτελέσματα της προσωπικής εργασίας.
description: Σε συνεργασία με το Παιδαγωγικό Τμήμα Νηπιαγωγών (Πανεπιστήμιο Δυτικής Μακεδονίας)
Discovery of magnetic topological crystals
Creators: name: Belopolski, Ilya
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Topological phases of matter have established a new paradigm in physics, bringing quantum phenomena to the macroscopic scale and hosting exotic emergent quasiparticles. In this thesis, I theoretically and experimentally demonstrate with my collaborators the first Weyl semimetal, TaAs, using angle-resolved photoemission spectroscopy (ARPES), directly observing its emergent Weyl fermions and topological Fermi arc surface states [Science 349, 6248 (2015); Nat. Commun. 6, 7373 (2015); PRL 116, 066802 (2016)]. Next, I discover high-degeneracy topological chiral fermions in the chiral crystals RhSi and CoSi, with wide topological energy window, maximal separation in momentum space and giant Fermi arcs [Nature 567, 500 (2019); Nat. Mat. 17, 978 (2018)]. I establish a natural relationship between the structural and topological chirality, associated with a robust topological state which we predict supports a four-unit quantized photogalvanic effect [PRL 119, 206401 (2017)]. I also discuss the first quantum topological superlattice, in multilayer heterostructures consisting of alternating topological and trivial insulators [Sci. Adv. 3, e1501692 (2017)]. The Dirac cones at each interface tunnel across layers, forming an emergent atomic chain where the Dirac cones serve as atomic orbitals. I achieve unprecedented control of hopping amplitudes within the superlattice, realizing a topological phase transition. Lastly, I discover a room-temperature topological magnet in Co$_2$MnGa [Science 365, 1278 (2019); PRL 119, 156401 (2017)]. I observe topological Weyl lines and drumhead surface states by ARPES, demonstrating a topological invariant supported by the material's intrinsic magnetic order. I also find that the large anomalous Hall effect in Co$_2$MnGa arises from the Weyl lines. I hope that my discovery of Co$_2$MnGa establishes topological magnetism as a new frontier in condensed matter physics.
description: Ph.D. Thesis. Based on arXiv:1502.03807, arXiv:1501.00755, arXiv:1703.04537, arXiv:1601.04327, arXiv:1509.07465, arXiv:1604.07079, arXiv:1512.09099, arXiv:1612.05990, arXiv:1610.02013, arXiv:1812.04466, arXiv:1712.09992 and arXiv:2004.00004. Available at http://arks.princeton.edu/ark:/88435/dsp01zs25xc34m
Nonvolatile memory with molecule-engineered tunneling barriers
Creators: name: Hou, Tuo-Hung
name: Raza, Hassan
name: Afshari, Kamran
name: Ruebusch, Daniel J.
name: Kan, Edwin C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report a novel field-sensitive tunneling barrier by embedding C60 in SiO2 for nonvolatile memory applications. C60 is a better choice than ultra-small nanocrystals due to its monodispersion. Moreover, C60 provides accessible energy levels to prompt resonant tunneling through SiO2 at high fields. However, this process is quenched at low fields due to HOMO-LUMO gap and large charging energy of C60. Furthermore, we demonstrate an improvement of more than an order of magnitude in retention to program/erase time ratio for a metal nanocrystal memory. This shows promise of engineering tunnel dielectrics by integrating molecules in the future hybrid molecular-silicon electronics.
description: to appear in Applied Physics Letters
Παλιό ταπητουργείο Κοτζαϊβάζογλου. Μελέτη αποκατάστασης – επανάχρησης.
Creators: name: Σφέτκου, Σοφία Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: ταπητουργείο
Έδεσσα
αποκατάσταση
carpet factory
Edessa
restoration

description: Το θέμα της παρούσας διπλωματικής εργασίας είναι η μελέτη αποκατάστασης και επανάχρησης του ταπητουργείου Κοτζαϊβάζογλου, ενός κτιρίου που συνδέεται στενά με την εγκατάσταση των προσφυγικών πληθυσμών στην πόλη της Έδεσσας. Αποτέλεσε ένα από τα πρώτα βιομηχανικά κτίρια που κατασκευάστηκε στους νέους οικισμούς που αναπτύχθηκαν στον απόηχο της Μικρασιατικής Καταστροφής και για χρόνια λειτούργησε ως ορόσημο, σηματοδοτώντας την είσοδο του Β’ Προσφυγικού Συνοικισμού. Ταυτόχρονα, τουλάχιστον μέχρι τη δεκαετία του 1950, η ιστορία του κτιρίου ακολούθησε τις γενικότερες εξελίξεις του κλάδου της βιομηχανίας, αλλά και ειδικότερα της πορεία της ταπητουργίας και της κλωστοϋφαντουργίας στην πόλη. Έτσι, στα τέλη της δεκαετίας του 1930, μετά από μια γενικότερη προσπάθεια διάσωσης της ταπητουργίας που επιχειρήθηκε, οι Κοτζαϊβάζογλου μετέτρεψαν την επιχείρησή τους σε κλωστήριο, πραγματοποιώντας ταυτόχρονα εκτεταμένες επεμβάσεις, ενώ το 1954 το εργοστάσιο στην Έδεσσα, λόγω χρεών της επιχείρησης, κατασχέθηκε από την Αγροτική Τράπεζα, στην οποία και ανήκει ακόμα. Το πρώτο μέρος της εργασίας αποτελεί η ανάλυση της σημερινής μορφής και της κατάστασης διατήρησης του κτιρίου, ενώ το δεύτερο εστιάζει το ενδιαφέρον στις εργασίες που απαιτούνται για την αποκατάσταση των δομικών και μορφολογικών του στοιχείων, καθώς και για την εγκατάσταση στο σωζόμενο κέλυφος ενός δημοτικού σχολείου.
description: The subject of this thesis is the study of the restoration and reuse of the Kotzaivazoglou carpet factory, a building that is closely linked to the establishment of refugee populations in the city of Edessa. It was one of the first industrial buildings constructed in Edessa in the wake of the Asia Minor Catastrophe and for years it served as a milestone, marking the entrance of the second refugee settlement. At the same time, at least until the 1950s, the history of the building follows the general developments in the industrial sector, and in particular the evolution of the carpet and textile industries in the city of Edessa. In the late 1930s, after a general effort to restore the carpet industry to its old glory, the Kotzaivazoglou transformed their business into a spinning mill, transformation which involved extensive modifications, while in 1954 the factory in Edessa, due to the debts of the company, was seized by the Agricultural Bank, which owns it still. The first part of the thesis is the analysis of the current state and the assessment of the conservation status of the building, while the second focuses on the interventions required to restoring its structural and morphological features, and for the surviving shell to be adapted for its use as a primary school.
Scaling Properties of Hyperon Production in Au+Au Collisions at sqrt(s_NN) = 200 GeV
Creators: name: STAR Collaboration
name: Adams, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present the scaling properties of Lambda, Xi, Omega and their anti-particles produced at mid-rapidity in Au+Au collisions at RHIC at sqrt(s_NN) = 200 GeV. The yield of multi-strange baryons per participant nucleon increases from peripheral to central collisions more rapidly than the Lambda yield, which appears to correspond to an increasing strange quark density of matter produced. The value of the strange phase space occupancy factor gamma_s, obtained from a thermal model fit to the data, approaches unity for the most central collisions. We also show that the nuclear modification factors, R_CP, of Lambda and Xi are consistent with each other and with that of protons in the transverse momentum range 2.0 < p_T < 5.0 GeV/c. This scaling behaviour is consistent with a scenario of hadron formation from constituent quark degrees of freedom through quark recombination or coalescence.
description: 6 pages, 3 figures, submitted to PRL
Freezing transition of the directed polymer in a $1+d$ random medium : location of the critical temperature and unusual critical properties
Creators: name: Monthus, Cecile
name: Garel, Thomas
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In dimension $d \geq 3$, the directed polymer in a random medium undergoes a phase transition between a free phase and a disorder dominated phase. For the latter, Fisher and Huse have proposed a droplet theory based on the scaling of the free energy fluctuations $ΔF(l) \sim l^θ$. On the other hand, in related growth models belonging to the KPZ universality class, Forrest and Tang have found that the height-height correlation function is logarithmic at the transition. For the directed polymer model at criticality, this translates into logarithmic free energy fluctuations $ΔF_{T_c}(l) \sim (\ln l)^σ$ with $σ=1/2$. In this paper, we propose a droplet scaling analysis exactly at criticality based on this logarithmic scaling. Our main conclusion is that the typical correlation length $ξ(T)$ of the low temperature phase, diverges as $ \ln ξ(T) \sim (- \ln (T_c-T))^{1/σ} \sim (- \ln (T_c-T))^{2} $. Furthermore, the logarithmic dependence of $ΔF_{T_c}(l)$ leads to the conclusion that the critical temperature $T_c$ actually coincides with the explicit upper bound $T_2$ derived by Derrida and coworkers, where $T_2$ corresponds to the temperature below which the ratio $\bar{Z_L^2}/(\bar{Z_L})^2$ diverges exponentially in $L$. Finally, since the Fisher-Huse droplet theory was initially introduced for the spin-glass phase, we briefly mention the similarities and differences with the directed polymer model. If one speculates that the free energy of droplet excitations for spin-glasses is also logarithmic at $T_c$, one obtains a logarithmic decay for the mean square correlation function at criticality $\bar{C^2(r)} \sim 1/(\ln r )^σ$.
description: final version, 16 pages, Appendix added
Beyond Ohm's law -- Bernoulli effect and streaming in electron hydrodynamics
Creators: name: Hui, Aaron
name: Oganesyan, Vadim
name: Kim, Eun-Ah
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Recent observations of non-local transport in ultraclean 2D materials raised the tantalizing possibility of accessing hydrodynamic correlated transport of many-electron state. However, it has been pointed out that non-local transport can also arise from impurity scattering rather than interaction. At the crux of the ambiguity is the focus on linear effects, i.e. Ohm's law, which cannot easily differentiate among different modes of transport. Here we propose experiments that can reveal rich hydrodynamic features in the system by tapping into the non-linearity of the Navier-Stokes equation. Three experiments we propose will each manifest unique phenomenon well-known in classical fluids: the Bernoulli effect, Eckart streaming, and Rayleigh streaming. Analysis of known parameters confirms that the proposed experiments are feasible and the hydrodynamic signatures are within reach of graphene-based devices. Experimental realization of any one of the three phenomena will provide a stepping stone to formulating and exploring the notions of nonlinear electron fluid dynamics with an eye to celebrated examples from classical non-laminar flows, e.g. pattern formation and turbulence.
description: 8 pages, 5 figures + 6 pages of appendices
Realization of a Room-Temperature Spin Dynamo: The Spin Rectification Effect
Creators: name: Gui, Y. S.
name: Mecking, N.
name: Zhou, X.
name: Williams, G.
name: Hu, C. -M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We demonstrate a room temperature spin dynamo where the precession of electron spins in ferromagnets driven by microwaves manifests itself in a collective way by generating d.c. currents. The current/power ratio is at least three orders of magnitude larger than that found previously for spin-driven currents in semiconductors. The observed bipolar nature and intriguing symmetry are fully explained by the spin rectification effect via which the nonlinear combination of spin and charge dynamics creates d.c. currents.
description: 5 pages, 4 figures
A Review of Charm Semileptonic Decays
Creators: name: Kim, Doris Yangsoo
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Several high energy experiments have been actively pursuing the analyses of semileptonic decays of charm mesons, resulting in numerous new results and publications. In this report, we summarize the recent efforts on the topics of pseudoscalar and vector charm semileptonic decays, especially in the area of branching fractions and form factor measurements.
description: 4 pages, a proceeding for the 7th International Conference on Hyperons, Charm And Beauty Hadrons (BEACH 2006), July 2nd-8th, 2006, University of Lancaster, England; typos corrected and some minor changes
title: The American Samoa Longline Limited-entry Fishery Semi-annual Report 1 July–31 December 2023
Creators: name: Pacific Islands Fisheries Science Center (U.S.). Fisheries Research and Monitoring Division
Publisher: name: NOAA National Marine Fisheries Service Pacific Islands Fisheries Science Center
publisherIdentifier: https://ror.org/02apffz65
publisherIdentifierScheme: ROR
Year: 2024

description: PIFSC data report ; DR-24-21
description: Effort and catch statistics for the American Samoa longline limited-entry fishery reported by fishers on electronic and paper logs are summarized for the second half of 2023 (1 July–31 December; PIFSC, 2024).
Crystal Model for the Closed Topological Vertex Geometry
Creators: name: Sulkowski, Piotr
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Geometry (math.AG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The topological string partition function for the neighbourhood of three spheres meeting at one point in a Calabi-Yau threefold, the so-called 'closed topological vertex', is shown to be reproduced by a simple Calabi-Yau crystal model which counts plane partitions inside a cube of finite size. The model is derived from the topological vertex formalism. This derivation can be understood as 'moving off the strip' in the terminology of hep-th/0410174, and offers a possibility to simplify topological vertex techniques to a broader class of Calabi-Yau geometries. To support this claim a flop transition of the closed topological vertex is considered and the partition function of the resulting geometry is computed in agreement with general expectations.
description: 26 pages, 7 figures; references added, classical part of flop analysis corrected and expanded
Direct solution of the inverse optimization problem of load sharing between muscles
Creators: name: Siemienski, Adam
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optimization and Control (math.OC)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Mathematics
subject: FOS: Biological sciences
subject: 49N45, 39B12, 39B22

description: In the context the statically indeterminate muscular load sharing problem considered in biomechanics of the musculoskeletal system, a method is suggested of constructing an additively separable and homogenous cost function based on a solution to a linearly constrained optimization problem involving this cost function. The construction makes use of the Koenigs solution of Schroeder's functional equation.
description: 1 page, no figures, slightly longer version of contribution to 5th World Congress of Biomechanics, Munich, Germany, 2006
The circulation and energetics of the Sechelt Inlet system, British Columbia
Creators: name: Tinis, Scott Wayne
Publisher: name: University of British Columbia
Year: 2009

description: The sill at the entrance to Sechelt Inlet, 50 km northwest of Vancouver, is tuned almost perfectly to extract the maximum power from the barotropic tide. However, despite the enormous up-inlet energy flux from the barotropic tide (~42 MW), the diffusive processes in the deep-water of the inlet basin are weak, and the energy flux of the internal tide generated at the sill is relatively small (< 200 kW). The large tidal energy flux is almost completely dissipated at the sill, and most of the energy that manages to escape the sill region does so in the form of a turbulent jet that dissipates at mid-depth near the sill; very little energy is left over for mixing the deep-water. Using estimates of the change in potential energy of the water column by vertical diffusion, the mixing efficiency (flux Richardson Number) of the breaking internal tide is determined to be between 3 and 8%. Because the transfer of energy to diffusive processes is so inefficient, the vertical diffusion of salt decreases the deep-water density by only ~0.0l kg m⁻³ per month. The decrease of the deep-water density conditions the inlet for eventual deep-water replace ment; however, hydrographic surveys in Sechelt Inlet suggest that while the mid-depth basin water is replaced once a year, the deep-water (below ~150 m) is replaced only about every five years. The wind has relatively little influence on the circulation. Much of the wind energy is contained in the diurnal seabreeze, and its effect on the overall baroclinic energy flux is estimated to be no more than 5%. The coherence of the wind to the currents in the lower frequency bands (f < 0.929 cpd) is small over most of the water column, with the frequency band between 0.2 ≤ f ≤ 0.66 cpd having the highest coherence. Empirical orthogonal function (EOF) analysis also indicates that the wind is not primarily responsible for the low frequency variability: the EOF analysis could not consistently identify the wind-driven mode as one that accounted for a significant percentage of the low frequency variance. The four-layer flow that was identified as the dominant mode of low frequency variability is also a persistent feature of the monthly mean currents, and is probably formed by density gradients created by the tidal mixing near the sill. The mean circulation is similar to that proposed in an earlier study of Sechelt Inlet by Lazier (1963).
Cutkosky Rules and Unitarity (Violation) in D-instanton Amplitudes
Creators: name: Sen, Ashoke
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In perturbative amplitudes in quantum field theory and string field theory, Cutkosky rule expresses the anti-hermitian part of a Feynman diagram in terms of sum over all its cut diagrams, and this in turn is used to prove unitarity of the theory. For D-instanton contribution to a string theory amplitude, the cutting rule needed for the proof of unitarity is somewhat different; we need to sum over only those cut diagrams for which all the world-sheet boundaries ending on some particular D-instanton lie on the same side of the cut. By working with the closed string effective action, obtained after integrating out the open string modes, we prove that the D-instanton amplitudes actually satisfy these cutting rules, provided the effective action is real. The violation of unitarity in the closed string sector of two dimensional string theory can be traced to the failure of this reality condition. In the critical superstring theory, multi-instanton and multi anti-instanton amplitudes satisfy the reality condition. Contribution to the amplitudes from the instanton anti-instanton sector satisfies the reality condition if we make a specific choice of integration cycle over the configuration space of string fields, whereas contribution due to the non-BPS D-instantons will need to either vanish or have an overall real normalization in order for it to give real contribution. We use Picard-Lefschetz theory to argue that these conditions are indeed satisfied in superstring theories.
description: LaTeX file; 94 pages
ELIXIR’s Training eSupport System – TeSS
Creators: name: Beard, Niall
name: Nenadic, Aleksandra
name: Attwood, Teresa
name: Goble, Carole
name: Thurston, Milo
name: Susanna-Assunta Sansone
Publisher: name: F1000Research
Year: 2015

description: A goal of ELIXIR – the pan-European research infrastructure for biological information – is to train scientists to use available computational resources to aide their research. For this, they need access to disparate training materials, scattered across Europe’s life-science sectors. ELIXIR's TeSS (Training eSupport System) was designed as a portal for discovering, packaging and disseminating training resources, automatically aggregating training information primarily from from ELIXIR Nodes. It provides at-a-glance views of ELIXIR nodes, allowing them to promote their latest news, events, activity highlights, etc. and contribute to the catalogue of training resources (tutorials, guides, etc.). The portal also aggregates information from 3rd-party content providers (e.g., GOBLET, Software Carpentry, the European Bioinformatics Institute), making attributed links to their resources. Using TeSS, training resources may be combined into bespoke collections of complementary materials – ‘packages’ – allowing users to gather resources of relevance to a topic of interest (sequence analysis, NGS, 3D-modelling, etc.) and to create custom lessons, modules or courses. To facilitate navigation through the plethora of resources available, TeSS also offers data- or activity-oriented views via ‘workflows’: i.e., interactive, visual representations of routine data-analysis tasks (database searching, sequence alignment, structure prediction, etc.) with links to relevant training resources and events. Tighter coupling between ELIXIR’s core databases/tools and their cognate training resources will be facilitated via links between TeSS and ELIXIR’s tools/services registry, and BioCatalogue and BioSharing initiatives.

The alpha version of TeSS, released in March 2015, is available at https://tess.oerc.ox.ac.uk.
Statefinder Diagnostic for Quintessence with or without Thermal Interaction
Creators: name: Liu, Wei-Zhong
name: Liu, Dao-Jun
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The cosmological dynamics of minimally coupled scalar field that couples to the background matter with thermal interactions is investigated by using statefinder diagnostics. The time evolution of the statefinder pairs $\{r,s\}$ and $\{r,q\}$ are obtained under the circumstance that different values of model parameters are chosen. We show that the thermal coupling term does not affect the location of the late-time attractor, but exert an influence on the evolution of the statefinder parameters. The most notable feature of the $r-s$ plane for the thermal coupling model which is distinguished from the other dark energy models is that some part of the curve with thermal coupling can form a closed loop in the second quadrant ($r>1,s<0$).
description: 10 pages, 6 figures, accepted for publication in IJMPD
Blind component separation for polarized observations of the CMB
Creators: name: Aumont, J.
name: Macias-Perez, J. F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present in this paper the PolEMICA (Polarized Expectation-Maximization Independent Component Analysis) algorithm which is an extension to polarization of the SMICA (Spectral Matching Independent Component Analysis) temperature multi-detectors multi-components (MD-MC) component separation method (Delabrouille et al. 2003). This algorithm allows us to estimate blindly in harmonic space multiple physical components from multi-detectors polarized sky maps. Assuming a linear noisy mixture of components we are able to reconstruct jointly the anisotropies electromagnetic spectra of the components for each mode T, E and B, as well as the temperature and polarization spatial power spectra, TT, EE, BB, TE, TB and EB for each of the physical components and for the noise on each of the detectors. PolEMICA is specially developed to estimate the CMB temperature and polarization power spectra from sky observations including both CMB and foreground emissions. This has been tested intensively using as a first approach full sky simulations of the Planck satellite polarized channels for a 14-months nominal mission assuming a simplified linear sky model including CMB, and optionally Galactic synchrotron emission and a Gaussian dust emission. Finally, we have applied our algorithm to more realistic Planck full sky simulations, including synchrotron, realistic dust and free-free emissions.
description: 20 pages, 21 figures, 1 table, TeX file, accepted for publication in MNRAS
The enigmatic globular cluster UKS~1 obscured by the bulge: \textit{H}-band discovery of nitrogen-enhanced stars
Creators: name: Fernández-Trincado, José G.
name: Minniti, Dante
name: Beers, Timothy C.
name: Villanova, Sandro
name: Geisler, Doug
name: Souza, Stefano O.
name: Smith, Leigh C.
name: Placco, Vinicius M.
name: Vieira, Katherine
name: Pérez-Villegas, Angeles
name: Barbuy, Beatriz
name: Alves-Brito, Alan
name: Bidin, Christian Moni
name: Alonso-García, Javier
name: Tang, Baitian
name: Palma, Tali
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The presence of nitrogen-enriched stars in globular clusters provides key evidence for multiple stellar populations (MPs), as has been demonstrated with globular cluster spectroscopic data towards the bulge, disk, and halo. In this work, we employ the VVV Infrared Astrometric Catalogue (VIRAC) and the DR16 SDSS-IV release of the APOGEE survey to provide the first detailed spectroscopic study of the bulge globular cluster UKS~1. Based on these data, a sample of six selected cluster members was studied. We find the mean metallicity of UKS~1 to be [Fe/H]$=-0.98\pm0.11$, considerably more metal-poor than previously reported, and a negligible metallicity scatter, typical of that observed by APOGEE in other Galactic globular clusters. In addition, we find a mean radial velocity of $66.1\pm12.9$ km s$^{-1}$, which is in good agreement with literature values, within 1$σ$. By selecting stars in the VIRAC catalogue towards UKS~1, we also measure a mean proper motion of ($μ_α\cos(δ)$, $μ_δ$) $=$ ($-2.77\pm0.23$,$-2.43\pm0.16$) mas yr$^{-1}$. We find strong evidence for the presence of MPs in UKS~1, since four out of the six giants analysed in this work have strong enrichment in nitrogen ([N/Fe]$\gtrsim+0.95$) accompanied by lower carbon abundances ([C/Fe]$\lesssim-0.2$). Overall, the light- (C, N), $α$- (O, Mg, Si, Ca, Ti), Fe-peak (Fe, Ni), Odd-Z (Al, K), and the \textit{s}-process (Ce, Nd, Yb) elemental abundances of our member candidates are consistent with those observed in globular clusters at similar metallicity. Furthermore, the overall star-to-star abundance scatter of elements exhibiting the multiple-population phenomenon in UKS~1 is typical of that found in other global clusters (GCs), and larger than the typical errors of some [X/Fe] abundances. Results from statistical isochrone fits in the VVV colour-magnitude diagrams indicate an age ...
description: 16 pages, 9 figures, 3 tables, A&A (in press)
Η ονοματική κλίση:
Creators: name: Αλεξανδρίδου, Δήμητρα Σταύρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: ουσιαστικά
επίθετα
θεματικός χώρος
nouns
adjectives
thematic space

description: Το θέμα της εργασίας είναι η ονοματική κλίση στα νέα ελληνικά. Αρχικά εξετάζουμε τα δεδομένα έτσι όπως έχουν καταγραφεί στη βιβλιογραφία. Στη συνέχεια εξετάζουμε τα κριτήρια που έχουν προταθεί για την ταξινόμησή τους. Τέλος παρουσιάζουμε την πρότασή μας στο πλαίσιο της Μορφολογίας των Παραδειγματικών Συναρτήσεων (Stump, 2001).
description: The subject of this study is nominal inflection in Modern Greek. Initially, we examine the data as they have been recorded in the bibliography. Subsequently, we examine the criteria that have been proposed for their classification. Finally, we present our proposal in the frame of Paradigm Function Morphology (Stump, 2001).
Tension dynamics in semiflexible polymers. Part II: Scaling solutions and applications
Creators: name: Hallatschek, Oskar
name: Frey, Erwin
name: Kroy, Klaus
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: In Part I of this contribution, a systematic coarse-grained description of the dynamics of a weakly-bending semiflexible polymer was developed. Here, we discuss analytical solutions of the established deterministic partial integro-differential equation for the spatio-temporal relaxation of the backbone tension. For prototypal experimental situations, such as the sudden application or release of a strong external pulling force, it is demonstrated that the tensile dynamics reflects the self-affine conformational fluctuation spectrum in a variety of intermediate asymptotic power laws. Detailed and explicit analytical predictions for the tension propagation and relaxation and corresponding results for common observables, such as the end-to-end distance, are obtained.
description: 22 pages, 7 figures
On the Spin of the B=7 Skyrmion
Creators: name: Manko, Olga V.
name: Manton, Nicholas S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the collective coordinate quantization of the icosahedrally symmetric B=7 Skyrmion, which is known to have a ground state with spin 7/2 and isospin 1/2. We find a particular quantum state maximally preserving the symmetries of the classical solution, and also present a novel relationship between the quantum state and the rational map approximation to the classical solution. We also investigate the allowed spin states if the icosahedral symmetry is partially broken. Skyrme field configurations with $D_5$ residual symmetry can be quantized with spin 3/2, giving a realistic model for the ground states of the $^7{\rm Li}/^7{\rm Be}$ isospin doublet
description: 20 pages, 3 figures
Κυλιόμενες δειγματοληπτικές έρευνες:
Creators: name: Ντιραϊκοπούλου, Ασημίνα Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Κυλιόμενες
Δειγματοληπτικές
Έρευνες
Rolling
Sample
Surveys

description: Η μελέτη αυτή ασχολείται με τις κυλιόμενες δειγματοληπτικές δημοσκοπήσεις ως εργαλείο κατανόησης του παρελθόντος και πρόβλεψης του μέλλοντος. Στο πρώτο κεφάλαιο γίνεται μια εισαγωγή στις βασικές κατηγορίες δειγματοληψίας και στην ιδέα για το σχεδιασμό κυλιόμενου δείγματος. Στο δεύτερο κεφάλαιο παρουσιάζονται κάποια σημαντικά θεωρήματα- πορίσματα- λήμμα, με τις αποδείξεις τους, τα οποία σχετίζονται με τον κινητό μέσο κι ο οποίος συνδέεται άμεσα με τις κυλιόμενες δειγματοληπτικές έρευνες. Στα δυο επόμενα κεφάλαια παρουσιάζεται ένα παράδειγμα κυλιόμενης δειγματοληπτικής δημοσκόπησης με αναφορά στη σχέση της με τον κινητό μέσο. Παρουσιάζεται δηλαδή η διαδικασία των κυλιόμενων δειγματοληπτικών ερευνών ως μια περίπτωση κινητού μέσου. Ακολουθούν διάφορα παραδείγματα υπολογισμού κινητού μέσου στα οποία αναλύεται η συμπεριφορά διαφόρων στατιστικών μεγεθών-παραμέτρων. Στο πέμπτο κεφάλαιο υπολογίζεται ο γενικός τύπος μέσης τιμής του κινητού μέσου για οποιαδήποτε τιμή βήματος. Τέλος, στο έκτο κεφάλαιο παρατίθενται τα συμπεράσματα από όλη την παρούσα εργασία και που αναφέρονται σε όλα τα αντικείμενα που εξετάστηκαν στα προηγούμενα πέντε κεφάλαια.
description: This study deals with the rolling sample surveys as a tool for understanding the past and predicting the future. In the first chapter an introduction to the basic categories of sampling and the idea for the rolling sample design is made. In the second chapter some important theorems- corollaries- lemma, which are associated with the moving average and who is directly connected with the rolling sample surveys, are presented with their proofs. In the next two chapters an example of rolling sample survey in relation with the moving average is presented. We show that we can see the rolling sample surveys as a moving average issue. Some other examples of calculating the moving average follow in which the behavior of different statistical parameters is analyzed. In the fifth chapter the general formula of mean of the moving average is calculated for any price of its step. Finally, in the sixth chapter the conclusions from all this work, which are referred to all items examined in the previous five chapters, are cited.