cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Wrapped Fivebranes Redux
Creators: name: Brennan, T. Daniel
name: Martinec, Emil J.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The near-horizon region of Neveu-Schwarz fivebranes provides interesting examples of gauge/gravity duality. We revisit the structure of wrapped and/or intersecting fivebranes using the tools of null-gauged WZW models in worldsheet string theory, revealing the effective geometry of the fivebrane throat in a variety of examples. Variant gaugings yield linear dilaton fivebrane throats with AdS3 caps, providing a wealth of information about the near-BPS structure of the corresponding spacetime CFT duals.
description: 50 pages, 1 figure
Electric field effect modulation of transition temperature, mobile carrier density and in-plane penetration depth in NdBa2Cu3O(7-delta) thin films
Creators: name: Matthey, D.
name: Reyren, N.
name: Schneider, T.
name: Triscone, J. -M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We explore the relationship between the critical temperature, T_c, the mobile areal carrier density, n_2D, and the zero temperature magnetic in-plane penetration depth, lambda_ab(0), in very thin underdoped NdBa2Cu3O{7-delta} films near the superconductor to insulator transition using the electric field effect technique. We observe that T_c depends linearly on both, n_2D and lambda_ab(0), the signature of a quantum superconductor to insulator (QSI) transition in two dimensions with znu-bar where z is the dynamic and nu-bar the critical exponent of the in-plane correlation length.
description: 4 pages, 4 figures
Επιστημονική Επανάσταση και Ορθόδοξη Ανατολή-Η περίπτωση του 18ου αιώνα
Creators: name: Λευκοπούλου, Σουλτάνα Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Ιστορία Επιστημών
Ορθόδοξη Ανατολή
18ος αιώνας
Επιστημονική Επανάσταση
History of Sciences
Eastern Orthodoxy
18th century
Scientific Revolution

description: Στόχος της παρούσας εργασίας είναι η παρουσίαση στοιχείων από μελέτες, οι οποίες αναφέρονται στη δράση των λογίων για την εισαγωγή, στην εκπαίδευση των ελληνοπαίδων, των νέων ιδεών στις Θετικές Επιστήμες που προέρχονταν από τη Δύση, στη δύσκολη για το Γένος περίοδο της Τουρκικής κυριαρχίας και συγχρόνως παρουσιάζουν τα δεδομένα κάτω από το φως της Ορθόδοξης παραδόσεως καθώς απεγκλωβίζονται από τη μονόπλευρη θεώρηση του ρόλου της Ορθόδοξης Εκκλησίας, η οποία χαρακτηρίστηκε από ομάδα μελετητών ως αντιδραστικός παράγοντας. Η εργασία, μετά από μία σύντομη γενική επισκόπηση της καταστάσεως στην εκπαίδευση των Θετικών Επιστημών στην διάρκεια των αιώνων της δουλείας, εστιάζεται στη μελέτη των δεδομένων για τον 18ο αιώνα. Κατ’ αρχήν εξετάζονται περιπτώσεις έντονων αντιπαραθέσεων και γίνεται προσπάθεια να οριοθετηθούν οι συνθήκες και το περιβάλλον στα οποία αυτές εκδηλώθηκαν. Στη συνέχεια παρουσιάζονται χαρακτηριστικές περιπτώσεις λογίων που δραστηριοποιούνται στο επιστημονικό πεδίο των Θετικών Επιστημών και των οποίων η δράση συνεισφέρει στο στόχο της παρούσας εργασίας.
description: The aim of this thesis is to present the contribution of scholars in the 18th century in Greece, during the Turkish occupation, in the field of sciences, under the perception of the Greek Orthodox tradition. After a brief general examination of the situation in education in Greece regarding the sciences, during the period of Turkish invasion, we study the facts in the 18th century. At first we examine cases of strong conflicts and we try to determine the circumstances under which they emerged. Then we present cases of scholars who contributed to the transmission of the new ideas in sciences and in the same time they are strongly related to the Orthodox Church..
Fault detection on pulp pressure screens
Creators: name: Estévez Reyes, Leoncio W
Publisher: name: University of British Columbia
Year: 2009

description: In this thesis the development of a strategy for the detection and isolation of faults particular to the pressure screens commonly used in mechanical pulp mills is presented. After exploring several non-model and model-based approaches for fault detection and isolation (FDI), a method is chosen. The method relies on the simultaneous identification of the states and process coefficients of a dynamic model for said screens. The criterion used in developing such a model is explained and the concept of "dynamical" friction coefficients as fault detection indicators is introduced. A technique called the Singular Pencil Matrix (SPM) for simultaneous identification of states and process coefficients is discussed and some simulation and industrial results using SPM are shown. As part of the validation of the dynamic model a reduced version of it is proposed and tested. The problem of modelling the process noise when applying SPM is discussed, some options are studied, and an alternative scheme based on cumulative functions for confirmation of screen faults is presented.
Οι σχέσεις Μεγάλης Βρετανίας και Σοβιετικής Ένωσης 1939-1945
Creators: name: Καραστέργιου, Μαρίνα Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Δεύτερος Παγκόσμιος Πόλεμος
Second World War

description: Σκοπός της διατριβής ήταν η μελέτη των σχέσεων Μεγάλης Βρετανίας και Σοβιετικής Ένωσης από το 1939 έως το 1945. Με στόχο να αποδειχθεί ότι η αμοιβαία καχυποψία και η έλλειψη εμπιστοσύνης ανάμεσά τους είχαν διαχρονικά ερείσματα και δεν αποτέλεσαν απλώς συνέπειες των ακραίων συνθηκών, που δημιουργήθηκαν κατά τη διάρκεια των ταραγμένων ετών του Δεύτερου Παγκοσμίου Πολέμου, επιχειρήθηκε η μακροσκοπική θεώρηση των γεγονότων. Για τον λόγο αυτό, σημείο εκκίνησης της διατριβής αποτελεί ο Κριμαϊκός Πόλεμος του 1853 και τα όσα αυτός κληροδότησε στις σχέσεις των δύο χωρών. Σταθμός, όχι μόνο για την Βρετανία και την ΕΣΣΔ, αλλά για όλη την Ευρώπη, υπήρξε η άνοδος στην εξουσία της Γερμανίας και η δημιουργία του Τρίτου Ράιχ από τον Αδόλφο Χίτλερ. Η περίοδος που ακολούθησε και μέχρι την έκρηξη του Πολέμου το 1939 χαρακτηρίστηκε από την προσπάθεια και των Βρετανών και των Σοβιετικών να κατευνάσουν τον γερμανικό αναθεωρητισμό. Ο στόχος ήταν κοινός, αυτό που διέφερε ήταν ο τρόπος που οι δύο δυνάμεις θεωρούσαν ότι έπρεπε να επιτευχθεί. Οι δυσκολίες συνεργασίας μεταξύ τους ακόμα και την ύστατη στιγμή, απέδειξαν ότι η έλλειψη εμπιστοσύνης διαδραμάτιζε προεξάρχοντα ρόλο. Βρετανία και ΕΣΣΔ βρέθηκαν να πολεμάνε σε κοινό μέτωπο μόνο το 1941, μετά την επίθεση του Χίτλερ στην ΕΣΣΔ. Η ανάγκη και όχι η διπλωματία ώθησε τα γεγονότα. Ακόμα όμως και κατά τη διάρκεια του πολέμου, η συνεργασία τους δεν ήταν ανέφελη και η καχυποψία δεν είχε αρθεί. Πριν τη λήξη του πολέμου είχε διαφανεί η σοβιετική κυριαρχία και η βρετανική αδυναμία.
description: The aim of the present thesis was the study of the relations between Great Britain and Soviet Union from 1939 to 1945. In order to prove that mutual suspicion and distrust between them had temporal footholds and they were not just the consequences of the extreme conditions, that created during the turbulent years of the Second World War, attempted a microscopic view of events. Therefore, starting point of the thesis is the Crimean War of 1853 and what he bequeathed to the relations between the two countries. Key fact, not only for Britain and USSR, but for all of Europe, was the coming to power of Germany and the creation of the Third Reich of Adolf Hitler. The period that followed until the outbreak of war in 1939 was marked by the efforts of the British and the Soviets to appease the German revisionism. The aim was common, what was different was the way that the two forces thought that should be achieved. The difficulties of cooperation between them, even at the ultimate moment proved that the lack of confidence played a prominent role. Britain and the USSR were fighting in a common front only in 1941, after Hitler attacked the USSR. The necessity rather than diplomacy led events. But even during the war, their cooperation was not cloudless and the suspicion had not been lifted. Before the termination of the war, it had already emerged the Soviet rule and the British weakness.
Spaces of idempotent measures of compact metric spaces
Creators: name: Bazylevych, Lidia
name: Repovš, Dušan
name: Zarichnyi, Michael
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 54C65; 52A30; 28A33

description: We investigate certain geometric properties of the spaces of idempotent measures. In particular, we prove that the space of idempotent measures on an infinite compact metric space is homeomorphic to the Hilbert cube.
Σύνθεση κραμάτων χαλκού-ψευδαργύρου με ηλεκτροχημική εναπόθεση για περιβαλλοντικές εφαρμογές
Creators: name: Κάμου, Αικατερίνη Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Ηλεκτροχημική εναπόθεση
Μεταλλικοί αφροί
Δέσμευση Cr(VI)
Electrodeposition
Metal foams
Cr(VI) removal

description: Στην παρούσα εργασία πραγματοποιήθηκε η σύνθεση μεταλλικών κραμάτων που προήλθαν από ηλεκτροχημικά αποτιθέμενες σκόνες Cu και Zn με σκοπό την χρήση τους ως μέσο για την αποτελεσματική απομάκρυνση του εξασθενούς χρωμίου από το πόσιμο νερό. Αρχικά μελετήθηκε η επίδραση του pH του διαλύματος στην ανάπτυξη κόνεων Cu και Zn. Στην συνέχεια, διερευνήθηκε η επίδραση της εφαρμοζόμενης τάσης κατά την ηλεκτροχημική εναπόθεση στην κοκκομετρία των προϊόντων χρησιμοποιώντας ηλεκτρόδια γραφίτη και σιδήρου. Επιλέχθηκαν οι βέλτιστες περιπτώσεις (μέγεθος κόκκων, χρόνος εναπόθεσης, καθαρότητα) και τα δείγματα αυτά ανοπτήθηκαν ή/και αναμίχθηκαν σε συγκεκριμένες αναλογίες ώστε να σχηματιστούν κράματα Cu-Zn, τα οποία χρησιμοποιήθηκαν για την παραγωγή πορωδών υλικών ανοιχτού κελιού (μεταλλικών αφρών). Οι παραγόμενοι αφροί δοκιμάστηκαν ως φίλτρα σε πειράματα δέσμευσης χρωμίου από το νερό. Τέλος, παρήχθησαν κράματα Cu-Zn από βιομηχανικές σκόνες με την μέθοδο χημικής εναπόθεσης ατμών στερεάς κλίνης (βελτιστοποιημένη διαδικασία) και αναπτύχθηκαν με ηλεκτροχημική εναπόθεση, ανάμιξη (όπου ήταν απαραίτητο) και ανόπτηση κράματα Fe-Zn και Fe-Cu για μελλοντική ερευνητική μελέτη.
description: This work investigates the composition of metal alloys derived from electrochemically deposited Cu and Zn powders for using them as a reducing medium for the efficient removal of hexavalent chromium from drinking water. Firstly, we examined the effect of pH on the growth of Cu and Zn powder. Then, we investigated the impact of the applied voltage during the electrodeposition on the crystalline size of the products using graphite and iron electrodes. Best cases were selected (as regards grain size, deposition time and purity) and these samples were annealed or/and mixed in specific proportions to form Cu-Zn alloys, which were used for the production of metal foams. Produced foams were tested as water filters in chromium adsorption experiments. Finally, we produced Cu-Zn alloys from industrial powders using pack cementation as optimized process and Fe-Zn and Fe-Cu alloys were produced applying electrodeposition, mixing (where necessary) and annealing for future research.
description: Σε συνεργασία με το Ινστιτούτο Τεχνολογίας Γκρενόμπλ (Γαλλία), το ΕΚΕΦΕ Δημόκριτος, και το CNRS (Centre National de la Researche Scientifique, Γαλλία)
Experimental and Computational Determination of Optimal Boron Content in Layered Superconductor Sc$_{20}$C$_{8-x}$B$_x$C$_{20}$
Creators: name: Ninomiya, Hiroki
name: Koshinuma, Terunari
name: Nishio, Taichiro
name: Fujihisa, Hiroshi
name: Kawashima, Kenji
name: Hase, Izumi
name: Ishida, Shigeyuki
name: Ogino, Hiraku
name: Iyo, Akira
name: Yoshida, Yoshiyuki
name: Gotoh, Yoshito
name: Eisaki, Hiroshi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: It is generally difficult to quantify the amounts of light elements in materials because of their low X-ray-scattering power, as this means that they cannot be easily estimated via X-ray analyses. Meanwhile, the recently reported layered superconductor, Sc$_{20}$C$_{8-x}$B$_x$C$_{20}$, requires a small amount of boron, which is a light element, for its structural stability. In this context, here, we quantitatively evaluate the optimal $x$ value using both the experimental and computational approaches. Using the high-pressure synthesis approach that can maintain the starting composition even after sintering, we obtain the Sc$_{20}$(C,B)$_{8}$C$_{20}$ phase by the reaction of the previously reported Sc$_{15}$C$_{19}$ and B (Sc$_{15}$B$_y$C$_{19}$). Our experiments demonstrate that an increase in $y$ values promotes the phase formation of the Sc$_{20}$(C,B)$_{8}$C$_{20}$ structure; however, there appears to be an upper limit to the nominal $y$ value to form this phase. The maximum $T_\mathrm{c}$ $(=7.6\text{ K})$ is found to correspond with the actual $x$ value of $x \sim 5$ under the assumption that the sample with the same $T_\mathrm{c}$ as the reported value $(=7.7\text{ K})$ possesses the optimal $x$ amount. Moreover, we construct the energy convex hull diagram by calculating the formation enthalpy based on first principles. Our computational results indicate that the composition of Sc$_{20}$C$_4$B$_4$C$_{20}$ $(x=4)$ is the most thermodynamically stable, which is reasonably consistent with the experimentally obtained value.
description: 10 pages, 1 table, 7 figures
Read my lips! Perception of speech in noise by preschool children with autism and the impact of watching the speaker’s face
Creators: name: Newman, Rochelle S.
name: Kirby, Laura A.
name: Von Holzen, Katie
name: Redcay, Elizabeth
Publisher: name: Springer Nature
Year: 2021
Subjects: autism
noise
speech perception
face

description: Adults and adolescents with autism spectrum disorders show greater difficulties comprehending speech in the presence of noise. Moreover, while neurotypical adults use visual cues on the mouth to help them understand speech in background noise, differences in attention to human faces in autism may affect use of these visual cues. No work has yet examined these skills in toddlers with ASD, despite the fact that they are frequently faced with noisy, multitalker environments.
Tricritical behavior in a neural model with excitatory and inhibitory units
Creators: name: Almeira, Joaquin
name: Grigera, Tomas S.
name: Chialvo, Dante R.
name: Cannas, Sergio A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: While the support for the relevance of critical dynamics to brain function is increasing, there is much less agreement on the exact nature of the advocated critical point. Thus, a considerable number of theoretical efforts are currently concentrated on which mechanisms and what type/s of transition can be exhibited by neuronal networks models. In that direction, the present work describes the effect of incorporating a fraction of inhibitory neurons on the collective dynamics. As we show, this results in the appearence of a tricritical point for highly connected networks and non-zero fraction of inhibitory neurons. We discuss the relation of the present results with relevant experimental evidence.
description: 7 pages, 7 figures
K*-couplings for the antidecuplet excitation
Creators: name: Azimov, Ya.
name: Kuznetsov, V.
name: Polyakov, M. V.
name: Strakovsky, I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We estimate the coupling of the K* vector meson to the N-->Theta+ transition employing unitary symmetry, vector meson dominance, and results from the GRAAL Collaboration for eta photoproduction off the neutron. Our small numerical value for the coupling constant is consistent with the non-observation of the Theta+ in recent CLAS searches for its photoproduction. We also estimate the K*-coupling for the N-->Sigma* excitation, with Sigma* being the Sigma-like antidecuplet partner of the Theta+-baryon.
description: 9 pages, 1 figure. Minor changes in text and abstract, references added; version to appear in Phys. Rev. D
Regular directed path and Moore flow
Creators: name: Gaucher, Philippe
Publisher: name: arXiv
Year: 2022
Subjects: subject: Category Theory (math.CT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: Using the notion of tame regular $d$-path of the topological $n$-cube, we introduce the tame regular realization of a precubical set as a multipointed $d$-space. Its execution paths correspond to the nonconstant tame regular $d$-paths in the geometric realization of the precubical set. The associated Moore flow gives rise to a functor from precubical sets to Moore flows which is weakly equivalent in the h-model structure to a colimit-preserving functor. The two functors coincide when the precubical set is spatial, and in particular proper. As a consequence, it is given a model category interpretation of the known fact that the space of tame regular $d$-paths of a precubical set is homotopy equivalent to a CW-complex. We conclude by introducing the regular realization of a precubical set as a multipointed $d$-space and with some observations about the homotopical properties of tameness.
description: 37 pages; Follows arXiv:2207.01378, key definitions repeated for the ease of the reader; v4: new section added and various improvements
Επικοινωνιακή λογικότητα και γλώσσα: μετατόπιση από τη μορφή στη σημασία: προοπτικές στην εκπαίδευση
Creators: name: Λαμνίας, Κώστας
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1996

description: This article discusses Habermas's notion of communicative rationality in order to clarify the communicative dimension of language, and draw some of its implications for educational policy and practice. Habermas's concept of communicative rationality, which grounds the communicative dimension of language brings forth the «double surface structure» of language; thereby making visible its two interrelated dimensions, namely propositional content and interpersonal relations. These dimensions, in turn, define language as both linguistic competence and linguistic performance. It is argued here that the Habermasian frame of communicative rationality, can be used to ground claims which seemingly are contradictory, That is to say, that language is a system, and must be treated as such when teaching it; and (hat language is its use, and therefore children should lean: to use it in specific contexts. In order to illustrate the habermasian frame, we have used elements from the current Greek Language Curriculum for Primary' Education (children's textbooks and teachers' guides). Our conclusions are that there is incongruence between explicit intentions to promote communication as a main dimension of language, and a clear epistemological basis (perspective) to support it.
description: Παιδαγωγική Επιθεώρηση, Vol. 24 (1996)
On The Mutations Loops of Valued Quivers
Creators: name: Saleh, Ibrahim
Publisher: name: arXiv
Year: 2022
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: A mutation loop of a valued quiver $Q$, is a combination of quiver automorphisms (permutations of vertices and valuations) and mutations that sends $Q$ to itself. In this article we study what we called \emph{global mutations loops} which are sequences formed of mutations only that send each quiver $Q'$ in the mutation class $[Q]$ to $σ(Q')$ for some permutation $σ$. Based on the weight of $[Q]$ and the shape of $Q$, we identify which quivers have mutations global loops and we provide them for each case.
MPEC 2024-T159 : 2024 TT3
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TT3

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Far-field radiation pattern in Coherent Anti-stokes Raman Scattering (CARS) Microscopy
Creators: name: Gachet, D.
name: Sandeau, N.
name: Rigneault, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Far field radiation pattern under tight focusing condition is investigated in Coherent Anti-stokes Raman Scattering (CARS) microscopy both in the forward (F-CARS) and backward (E-CARS) directions. While we assume no refraction index mismatch between the sample and the environing medium, our rigorous numerical electromagnetic computation takes into account the exact polarizations of the excitation laser beams and of the induced nonlinear dipoles. F-CARS and E-CARS radiation patterns, as well as their divergence, are studied as a function of the size of the sample object and compared to the excitation beams.
Bring's curve: Old and New
Creators: name: Braden, H. W.
name: Disney-Hogg, Linden
Publisher: name: arXiv
Year: 2022
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14E07, 14H55, 14Q05, 14K02, 14K25

description: Bring's curve, the unique Riemann surface of genus-4 with automorphism group $S_5$, has many exceptional properties. We review, give new proofs of, and extend a number of these including giving the complete realisation of the automorphism group for a plane curve model, identifying a new elliptic quotient of the curve and the modular curve $X_0(50)$, providing a complete description of the orbit decomposition of the theta characteristics, and identifying the unique invariant characteristic with the divisor of the Szëgo kernel. In achieving this we have used modern computational tools in Sagemath, Macaulay2, and Maple, for which notebooks demonstrating calculations are provided.
description: 38 pages, 5 figures, accompanying Jupyter notebooks available at https://github.com/DisneyHogg/Brings_Curve
MPEC 2024-T160 : 2024 TU3
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TU3

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
An extended variational formula for the Bismut-Cheeger eta form and its applications
Creators: name: Ho, Man-Ho
Publisher: name: arXiv
Year: 2022
Subjects: subject: K-Theory and Homology (math.KT)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 19K56, 19L50, 19L10

description: The purpose of this paper is to extend our previous work on the variational formula for the Bismut-Cheeger eta form without the kernel bundle assumption by allowing the spin$^c$ Dirac operators to be twisted by isomorphic vector bundles, and to establish the $\mathbb{Z}_2$-graded additivity of the Bismut-Cheeger eta form. Using these results, we give alternative proofs of the fact that the analytic index in differential $K$-theory is a well defined group homomorphism, and the Riemann-Roch-Grothendieck theorem in $\mathbb{R}/\mathbb{Z}$ $K$-theory.
description: 36 pages. Comments are welcome. Final version (with further typos corrected)
Η εκπαίδευση των εκπαιδευτικών: τάσεις στην Ευρώπη
Creators: name: Brinkmann, Günter
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1996

description: Παιδαγωγική Επιθεώρηση, Vol. 24 (1996)
Liquid Water Oceans in Ice Giants
Creators: name: Wiktorowicz, Sloane J.
name: Ingersoll, Andrew P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aptly named, ice giants such as Uranus and Neptune contain significant amounts of water. While this water cannot be present near the cloud tops, it must be abundant in the deep interior. We investigate the likelihood of a liquid water ocean existing in the hydrogen-rich region between the cloud tops and deep interior. Starting from an assumed temperature at a given upper tropospheric pressure (the photosphere), we follow a moist adiabat downward. The mixing ratio of water to hydrogen in the gas phase is small in the photosphere and increases with depth. The mixing ratio in the condensed phase is near unity in the photosphere and decreases with depth; this gives two possible outcomes. If at some pressure level the mixing ratio of water in the gas phase is equal to that in the deep interior, then that level is the cloud base. Alternately, if the mixing ratio of water in the condensed phase reaches that in the deep interior, then the surface of a liquid ocean will occur. We find that Neptune is both too warm (photospheric temperature too high) and too dry (mixing ratio of water in the deep interior too low) for liquid oceans to exist at present. To have a liquid ocean, Neptune's deep interior water to gas ratio would have to be higher than current models allow, and the density at 19 kbar would have to be ~ 0.8 g/cm^3. Such a high density is inconsistent with gravitational data obtained during the Voyager flyby. As Neptune cools, the probability of a liquid ocean increases. Extrasolar "hot Neptunes," which presumably migrate inward toward their parent stars, cannot harbor liquid water oceans unless they have lost almost all of the hydrogen and helium from their deep interiors.
description: 31 pages, 11 figures, accepted for publication in Icarus
MPEC 2024-T161 : 2024 TV3
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TV3

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Structure and Internal Kinematics of Nine Inner Milky Way Globular Clusters
Creators: name: Cohen, Roger E.
name: Bellini, Andrea
name: Libralato, Mattia
name: Correnti, Matteo
name: Brown, Thomas M.
name: Kalirai, Jason S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: This study constitutes part of a larger effort aimed at better characterizing the Galactic globular clusters (GGCs) located towards the inner Milky Way bulge and disk. Here, we focus on internal kinematics of nine GGCs, obtained from space-based imaging over time baselines of $>$9 years. We exploit multiple avenues to assess the dynamical state of the target GGCs, constructing radial profiles of projected stellar density, proper motion dispersion, and anisotropy. We posit that two-thirds (6/9) of our target GGCs are in an advanced dynamical state, and are close to (or have recently undergone) core collapse, supported by at least two lines of evidence: First, we find relatively steep proper motion dispersion profiles, in accord with literature values for core-collapsed GGCs. Second, we find that our sample is, in the mean, isotropic even out to their half-light radii, although one of our target clusters (NGC 6380) is tangentially anisotropic at $>$1$σ$ beyond its half-light radius, in accord with theoretical predictions for clusters evolving in strong tidal fields. Our proper motion dispersion and anisotropy profiles are made publicly available.
description: AJ in press
Hurwitz numbers for reflection groups II: Parabolic quasi-Coxeter elements
Creators: name: Douvropoulos, Theo
name: Lewis, Joel Brewster
name: Morales, Alejandro H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Combinatorics (math.CO)
subject: Differential Geometry (math.DG)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 05Axx, 20F55, 53D45

description: We define parabolic quasi-Coxeter elements in well generated complex reflection groups. We characterize them in multiple natural ways, and we study two combinatorial objects associated with them: the collections $\operatorname{Red}_W(g)$ of reduced reflection factorizations of $g$ and $\operatorname{RGS}(W,g)$ of the relative generating sets of $g$. We compute the cardinalities of these sets for large families of parabolic quasi-Coxeter elements and, in particular, we relate the size $\#\operatorname{Red}_W(g)$ with geometric invariants of Frobenius manifolds. This paper is second in a series of three; we will rely on many of its results in part III to prove uniform formulas that enumerate full reflection factorizations of parabolic quasi-Coxeter elements, generalizing the genus-$0$ Hurwitz numbers.
description: v2: 50 pages, minor edits, comments very much welcome!
Incorporating Machine Learning to Evaluate Solutions to the University Course Timetabling Problem
Creators: name: Kenekayoro, Patrick
Publisher: name: arXiv
Year: 2020
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Evaluating solutions to optimization problems is arguably the most important step for heuristic algorithms, as it is used to guide the algorithms towards the optimal solution in the solution search space. Research has shown evaluation functions to some optimization problems to be impractical to compute and have thus found surrogate less expensive evaluation functions to those problems. This study investigates the extent to which supervised learning algorithms can be used to find approximations to evaluation functions for the university course timetabling problem. Up to 97 percent of the time, the traditional evaluation function agreed with the supervised learning regression model on the result of comparison of the quality of pair of solutions to the university course timetabling problem, suggesting that supervised learning regression models can be suitable alternatives for optimization problems' evaluation functions.
Thermodynamic consistency between the energy and virial routes in the mean spherical approximation for soft potentials
Creators: name: Santos, Andres
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: It is proven that, for any soft potential characterized by a finite Fourier transform $\widetildeϕ(k)$, the virial and energy thermodynamic routes are equivalent for approximations such that the Fourier transform of the total correlation function divided by the density $ρ$ is an arbitrary function of $ρβ\widetildeϕ(k)$, where $β$ is the inverse temperature. This class includes the mean spherical approximation as a particular case.
description: 3 pages; v2: Comment on compressibility route added; to be published in JCP
On the magnetoionic environments of fast radio bursts
Creators: name: Wang, Wei-Yang
name: Zhang, Bing
name: Chen, Xuelei
name: Xu, Renxin
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Observations of the Faraday rotation measure, combined with the dispersion measure, can be used to infer the magnetoionic environment of a radio source. We investigate the magnetoionic environments of FRBs by deriving their estimated average magnetic field strengths along the line of sight $\langle B_{\parallel}\rangle$ in their host galaxies and comparing them with those of Galactic pulsars and magnetars. We find that for those FRBs with RM measurements, the mean $\langle B_{\parallel}\rangle$ is $1.77^{+9.01}_{-1.48}\,\rmμG$ and $1.74^{+14.82}_{-1.55}\,\rmμG$ using two different methods, which is slightly larger but not inconsistent with the distribution of Galactic pulsars, $1.00^{+1.51}_{-0.60}\,\rmμG$. Only six Galactic magnetars have estimated $\langle B_{\parallel}\rangle$. Excluding PSR J1745--2900 that has an anomalously high value due to its proximity with the Galactic Centre, the other three sources have a mean value of $1.70\,\rmμG$, which is statistically consistent with the $\langle B_{\parallel}\rangle$ distributions of both Galactic pulsars and FRBs. There is no apparent trend of evolution of magnetar $\langle B_{\parallel}\rangle$ as a function of age or surface magnetic field strength. Galactic pulsars and magnetars close to the Galactic Centre have relatively larger $\langle B_{\parallel}\rangle$ values than other pulsars/magnetars. We discuss the implications of these results for the magnetoionic environments of FRB 121102 within the context of magnetar model and the model invoking a supermassive black hole, and for the origin of FRBs in general.
description: 8 pages, 3 figures, MNRAS accepted
On Genus Two Riemann Surfaces Formed from Sewn Tori
Creators: name: Mason, Geoffrey
name: Tuite, Michael P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We describe the period matrix and other data on a higher genus Riemann surface in terms of data coming from lower genus surfaces via an explicit sewing procedure. We consider in detail the construction of a genus two Riemann surface by either sewing two punctured tori together or by sewing a twice-punctured torus to itself. In each case the genus two period matrix is explicitly described as a holomorphic map from a suitable domain (parameterized by genus one moduli and sewing parameters) to the Siegel upper half plane $\mathbb{H}_{2}$. Equivariance of these maps under certain subgroups of $Sp(4,\mathbb{Z)}$ is shown. The invertibility of both maps in a particular domain of $\mathbb{H}_{2}$ is also shown.
description: 61 pages, 1 Figure
UNWRITTEN VS WRITTEN CONSTITUTIONS: STRUCTURAL CONTRASTS BETWEEN BRITAIN AND INDIA
Creators: name: Dr. Goutam Banerjee
Publisher: name: Zenodo
Year: 2025

description: This comparative study investigates the democratic functionality of written and unwritten constitutions by analyzing India’s codified constitutional framework and the United Kingdom’s uncodified model between 2020 and 2024. The study is crucial given the global debate on constitutional adaptability amidst crises such as Brexit, the COVID-19 pandemic, and digital governance challenges. Utilizing a qualitative comparative approach with secondary data, the research draws from over 40 scholarly and institutional sources. Employing statistical tools-Pearson correlation, regression, and t-tests-the study found a strong negative correlation (r = -0.981) between constitutional codification and public trust, while legal clarity showed a robust positive relationship (r = 0.996) with judicial independence. A significant difference (t = 10.73, p < 0.001) was found in policy responsiveness, favoring the UK's flexible structure. The composite regression model yielded R² = 0.976, confirming that 97.6% of the variance in democratic performance is explained by codification, legal literacy, policy lag, and adaptability. The results imply that while codified systems offer clarity, they hinder responsiveness, whereas flexible models enhance agility but may lack transparency. The study recommends hybrid governance models, legal simplification, and improved civic education to enhance democratic resilience globally.
MPEC 2024-T162 : 2024 TW3
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TW3

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
A systematic search for very massive galaxies at z > 4
Creators: name: Dunlop, J. S.
name: Cirasuolo, M.
name: McLure, R. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Motivated by the claimed discovery of a very massive galaxy (HUDF-JD2; M~5x10^11 Msun) at extreme redshift (z = 6.5) within the Hubble Ultra Deep Field (HUDF) (Mobasher et al. 2005), we have completed a systematic search for comparably massive galaxies with z > 4 among the 2688 galaxies in our K < 23.5 (AB) catalogue within the CDFS/GOODS-South field. This search was conducted using redshift estimates based on the recently-completed, uniquely-deep 11-band imaging in this 125 square arcmin field, ~25 times larger than the NICMOS HUDF. Initial spectral fitting, based on published catalogue SExtractor photometry, led us to conclude that at least 2669 of the galaxies in our sample lie at z < 4. We carried out a detailed investigation of the 19 remaining z > 4 candidates, performing aperture photometry on all images, and including marginal detections and formal non-detections in the fitting process. This led to the rejection of a further 13 galaxies to lower redshift. Moreover, subjecting HUDF-JD2 to the same analysis, we find that it lies at z ~ 2.2, rather than the extreme redshift favoured by Mobasher et al. (2005). The 6 remaining candidates appear to be credible examples of galaxies in the redshift range z = 4 - 6, with plausible stellar ages. However, refitting with allowance for extreme values of extinction we find that, even for these objects, statistically acceptable solutions can be found at z < 3. Moreover, the recently-released Spitzer MIPS imaging in GOODS-South has revealed that 5 of our 6 final z > 4 candidates are detected at 24 microns. We conclude that there is no convincing evidence for any galaxy with M > 3 x 10^11 Msun, and z > 4 within the GOODS-South field (abridged).
description: 12 pages, 6 figures, submitted to MNRAS
Continuous close-range 3D object pose estimation
Creators: name: Grossmann, Bjarne
name: Rovida, Francesco
name: Krueger, Volker
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In the context of future manufacturing lines, removing fixtures will be a fundamental step to increase the flexibility of autonomous systems in assembly and logistic operations. Vision-based 3D pose estimation is a necessity to accurately handle objects that might not be placed at fixed positions during the robot task execution. Industrial tasks bring multiple challenges for the robust pose estimation of objects such as difficult object properties, tight cycle times and constraints on camera views. In particular, when interacting with objects, we have to work with close-range partial views of objects that pose a new challenge for typical view-based pose estimation methods. In this paper, we present a 3D pose estimation method based on a gradient-ascend particle filter that integrates new observations on-the-fly to improve the pose estimate. Thereby, we can apply this method online during task execution to save valuable cycle time. In contrast to other view-based pose estimation methods, we model potential views in full 6- dimensional space that allows us to cope with close-range partial objects views. We demonstrate the approach on a real assembly task, in which the algorithm usually converges to the correct pose within 10-15 iterations with an average accuracy of less than 8mm.
High-speed linear optics quantum computing using active feed-forward
Creators: name: Prevedel, Robert
name: Walther, Philip
name: Tiefenbacher, Felix
name: Böhi, Pascal
name: Kaltenbaek, Rainer
name: Jennewein, Thomas
name: Zeilinger, Anton
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: As information carriers in quantum computing, photonic qubits have the advantage of undergoing negligible decoherence. However, the absence of any significant photon-photon interaction is problematic for the realization of non-trivial two-qubit gates. One solution is to introduce an effective nonlinearity by measurements resulting in probabilistic gate operations. In one-way quantum computation, the random quantum measurement error can be overcome by applying a feed-forward technique, such that the future measurement basis depends on earlier measurement results. This technique is crucial for achieving deterministic quantum computation once a cluster state (the highly entangled multiparticle state on which one-way quantum computation is based) is prepared. Here we realize a concatenated scheme of measurement and active feed-forward in a one-way quantum computing experiment. We demonstrate that, for a perfect cluster state and no photon loss, our quantum computation scheme would operate with good fidelity and that our feed-forward components function with very high speed and low error for detected photons. With present technology, the individual computational step (in our case the individual feed-forward cycle) can be operated in less than 150 ns using electro-optical modulators. This is an important result for the future development of one-way quantum computers, whose large-scale implementation will depend on advances in the production and detection of the required highly entangled cluster states.
description: 19 pages, 4 figures
Lost in Zero Space -- An Empirical Comparison of 0.y.z Releases in Software Package Distributions
Creators: name: Decan, Alexandre
name: Mens, Tom
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Distributions of open source software packages dedicated to specific programming languages facilitate software development by allowing software projects to depend on the functionality provided by such reusable packages. The health of a software project can be affected by the maturity of the packages on which it depends. The version numbers of the used package releases provide an indication of their maturity. Packages with a 0.y.z version number are commonly assumed to be under initial development, suggesting that they are likely to be less stable, and depending on them may be considered as less healthy. In this paper, we empirically study, for four open source package distributions (Cargo, npm, Packagist and RubyGems) to which extent 0.y.z package releases and >=1.0.0 package releases behave differently. We quantify the prevalence of 0.y.z releases, we explore how long packages remain in the initial development stage, we compare the update frequency of 0.y.z and >=1.0.0 package releases, we study how often 0.y.z releases are required by other packages, we assess whether semantic versioning is respected for dependencies towards them, and we compare some characteristics of 0.y.z and >=1.0.0 package repositories hosted on GitHub. Among others, we observe that package distributions are more permissive than what semantic versioning dictates for 0.y.z releases, and that many of the 0.y.z releases can actually be regarded as mature packages. As a consequence, the version number does not provide a good indication of the maturity of a package release.
description: preprint
Stability of the spectral gap and ground state indistinguishability for a decorated AKLT model
Creators: name: Lucia, Angelo
name: Moon, Alvin
name: Young, Amanda
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We use cluster expansions to establish local indistiguishability of the finite-volume ground states for the AKLT model on decorated hexagonal lattices with decoration parameter at least 5. Our estimates imply that the model satisfies local topological quantum order (LTQO), and so the spectral gap above the ground state is stable against local perturbations.
description: 38 pages, 5 figures. v2: Updated acknowledgments section
Η λειτουργική ασυμμετρία δεξιάς-αριστεράς στον άνθρωπο ή περί δεξιόχειρης και αριστερόχειρης συμπεριφοράς
Creators: name: Αλμυράντης, Γ.
Publisher: name: Παιδαγωγική Επιθεώρηση
Year: 1996

description: Some aspects of left-right asymmetry are reviewed, especially the «operational» asymmetry (left-handedness) in humans. The special character of the left-right polarity of the human body is compared to the rest of the space couples of directions (up-down, front-back). The symbolic meaning of the concepts of «right» and «left» in different civilizations is also briefly discussed. Then, evidence is given on the origin, herebity and population distribution of left-handedness. The relation of left-handedness with cerebral asymmetry is vonsidered. Finally, the several attitudes adopted is different times and societies towards left-handed people and the tendency to reeducate left-handed children, applied until very recently, are discussed. Of special interest are the questions arising in the course of children education. The conclusion is that the main objective should be to shape from every left- or right-handed child a «good» left- or right-handed adult.
description: Παιδαγωγική Επιθεώρηση, Vol. 24 (1996)