cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Κοινωνικοί προβληματισμοί στο σύγχρονο εφηβικό και νεανικό μυθιστόρημα στην Ελλάδα και στη Γερμανία – Μια παράλληλη ανάγνωση:
Creators: name: Παπαδόπουλος, Γεώργιος Ευσταθίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Κοινωνικοί προβληματισμοί
Σύγχρονο εφηβικό και νεανικό μυθιστόρημα
Παράλληλη ανάγνωση
Social issues
Modern young novel
Parallel study

description: Σκοπός της διπλωματικής εργασίας ήταν η παράλληλη ανάγνωση της επεξεργασίας, παρουσίασης και προβολής κοινωνικών προβληματισμών στο σύγχρονο ελληνικό και γερμανικό νεανικό μυθιστόρημα. Αφού επιλέξαμε η παράλληλη αυτή ανάγνωση να περιοριστεί σε έναν μόνο από τους πέντε θεματικούς κύκλους της νεανικής λογοτεχνίας, δηλαδή τον κοινωνικό, ορίσαμε ως επιμέρους κοινωνικούς προβληματισμούς που θα απασχολήσουν το παρόν εκπόνημα το AIDS και τα ναρκωτικά. Με βάση τα κείμενα τεσσάρων σύγχρονων νεανικών μυθιστορημάτων, δύο ελληνικών και δύο γερμανικών, που εξετάστηκαν ανά ζευγάρι σε κάθε θεματική ενότητα, επιχειρήσαμε την συγκριτική προσέγγιση και ανάδειξη των συγκεκριμένων κοινωνικών προβληματισμών. Σ’ ένα πρώτο επίπεδο συγκριτικής προσέγγισης των έργων αναδείξαμε, παρουσιάσαμε και μελετήσαμε τα ιδιαίτερα χαρακτηριστικά της αφηγηματικής τεχνικής που ο κάθε συγγραφέας εφαρμόζει στο έργο του, ενώ σ’ ένα δεύτερο επίπεδο προβήκαμε σε μια συνοπτική ανάλυση του ύφους και της γλώσσας και της χρήσης της σε καθένα από τα τέσσερα λογοτεχνικά έργα ξεχωριστά. Ακόμη διεξήγαμε μια σύντομη ανάλυση της λογοτεχνικής επικοινωνίας, όπως αυτή λαμβάνει χώρα μεταξύ συγγραφέων και αναγνωστών, μελετώντας κυρίως τα παρακειμενικά ή εξωκειμενικά στοιχεία που συνοδεύουν τα μυθιστορήματα. Ασχοληθήκαμε, τέλος, με την επονομαζόμενη και ως διπλή κατεύθυνση της νεανικής λογοτεχνίας και διαπιστώσαμε πως αυτή απευθύνεται, εκτός από τους τελικούς αποδέκτες της, και σε ενήλικες συναναγνώστες.
description: The aim of this paper was the parallel reading of the elaboration, presentation and projection of social issues in Modern Greek and German young novel. After choosing limiting this parallel reading in one of the five thematic circles of young fiction, the social one, AIDS and drugs were defined as the social issues which will be the focus of the present paper. Based on the texts of four modern young novels, two Greek and two German, which were examined as a couple in every thematic unit, it was attempted a comparative approach and demonstration of these special social issues. On a first level of comparative approach of the novels, the special characteristics of the narrative technique that each writer uses in his work were shown, presented and studied, while on a second level, an concise analysis on style and language and its use in every four literary works separately was elaborated. In addition, a short analysis of literary communication was demonstrated, as this takes place between writers and readers, studying in particular the para- textual or outer- textual elements existing in novels. Finally, the so- called double direction of young fiction was concerned and it was found that it is addressed, apart from its final addressees, to adult co-readers as well.
Constraints on the IR behaviour of gluon and ghost propagator from Ward-Slavnov-Taylor identities
Creators: name: Boucaud, Ph.
name: Leroy, J. P.
name: Yaouanc, A. Le
name: Micheli, J.
name: Pène, O.
name: Lokhov, A. Y.
name: Rodríguez-Quintero, J.
name: Roiesnel, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the constraints of the Slavnov-Taylor identity of the IR behaviour of gluon and ghost propagators and their compatibility with solutions of the ghost Dyson-Schwinger equation and with the lattice picture.
description: 5 pages, 2 figures
Reproducibility of a noisy limit-cycle oscillator induced by a fluctuating input
Creators: name: Nakao, Hiroya
name: Nagai, Ken
name: Arai, Kensuke
Publisher: name: arXiv
Year: 2006
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: Reproducibility of a noisy limit-cycle oscillator driven by a random piecewise constant signal is analyzed. By reducing the model to random phase maps, it is shown that the reproducibility of the limit cycle generally improves when the phase maps are monotonically increasing.
description: 4 pages, 3 figures, Prog. Theoret. Phys. Suppl. 2006
Integration of Multi-Echelon Optimal Supply Chain Design with Stochastic Inventory Management
Creators: name: Πετρίδης, Κωνσταντίνος Ευστρατίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Σχεδίαση εφοδιαστικής αλυσίδας
Διαχείριση αποθεμάτων
Μεικτός ακέραιος προγραμματισμός
Μεικτός μη-ακέραιος προγραμματισμός
Supply chain design
Inventory management
Mixed Integer Programming

description: Σκοπός της διατριβής ήταν η μελέτη της στοχαστικότητας της ζήτησης, η οποία δημιουργεί την ανάγκη τήρησης αποθεμάτων ελαχιστοποιώντας το κόστος διατήρησης αποθεμάτων και πως οι αποφάσεις αυτές επηρεάζουν την δομή και τον σχεδιασμό της εφοδιαστικής αλυσίδας. Θεωρώντας πως η ζήτηση στη ζώνη των πελατών γενικευμένων αλυσίδων ακολουθεί στοχαστικές κατανομές προκύπτουν προβλήματα μεικτού ακέραιου προγραμματισμού και μη-γραμμικού προγραμματισμού τα οποία επίσης λαμβάνουν υπόψιν και ολοκληρώνουν θέματα βέλτιστου σχεδιασμού της αλυσίδας, όπως τοποθέτηση αποθηκών, κέντρων διανομής, ροές δικτύου και παραγωγή. Επίσης έγινε επίλυση και εφαρμογή σε μεγάλα προβλήματα εφοδιαστικών αλυσίδων καθώς και ανάπτυξη κώδικα σε λογισμικό βελτιστοποίησης.
description: The aim of the present thesis was the study of stochasticity of demand minimizing the inventory cost and how these decisions affect the design of the network of the supply chain. Considering that the demand in the customer’s zone follows stochastic distributions Mixed Integer Problems (MIP) and Mixed Integer Non-Linear Problems arise and decision in an integration of multi-echelon optimal supply chain design must be taken considering the installation of warehouses, distribution centers, the flows of products that must be produced and must be transported. Also the problem was solved and there was an application of the problem in large scale supply chains while development of code in optimization software was also carried out.
Microscopic annealing process and its impact on superconductivity in T'-structure electron-doped copper oxides
Creators: name: Kang, Hye Jung
name: Dai, Pengcheng
name: Campbell, Branton J.
name: Chupas, Peter J.
name: Rosenkranz, Stephan
name: Lee, Peter L.
name: Huang, Qingzhen
name: Li, Shiliang
name: Komiya, Seiki
name: Ando, Yoichi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: High-transition-temperature superconductivity arises in copper oxides when holes or electrons are doped into the CuO2 planes of their insulating parent compounds. While hole-doping quickly induces metallic behavior and superconductivity in many cuprates, electron-doping alone is insufficient in materials such as R2CuO4 (R is Nd, Pr, La, Ce, etc.), where it is necessary to anneal an as-grown sample in a low-oxygen environment to remove a tiny amount of oxygen in order to induce superconductivity. Here we show that the microscopic process of oxygen reduction repairs Cu deficiencies in the as-grown materials and creates oxygen vacancies in the stoichiometric CuO2 planes, effectively reducing disorder and providing itinerant carriers for superconductivity. The resolution of this long-standing materials issue suggests that the fundamental mechanism for superconductivity is the same for electron- and hole-doped copper oxides.
description: 23 pages, 3 figures, accepted for publication in Nature Materials
Pseudo-Hermitian extensions of the harmonic and isotonic oscillators
Creators: name: Ghosh, Aritra
name: Sinha, Akash
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this work, we describe certain pseudo-Hermitian extensions of the harmonic and isotonic oscillators, both of which are exactly-solvable models in quantum mechanics. By coupling the dynamics of a particle moving in a one-dimensional potential to an imaginary-valued gauge field, it is possible to obtain certain pseudo-Hermitian extensions of the original (Hermitian) problem. In particular, it is pointed out that the Swanson oscillator arises as such an extension of the quantum harmonic oscillator. For the pseudo-Hermitian extensions of the harmonic and isotonic oscillators, we explicitly solve for the wavefunctions in the position representation and also explore their intertwining relations.
description: Based on talk delivered at the Xth International Workshop on New Challenges in Quantum Mechanics: Graphene, Supersymmetry, and Mathematical Physics (2024); v2: Some errors corrected; v3: Final version
Statistical Properties of Superflares on Solar-type Stars: Results Using All of the Kepler Primary Mission Data
Creators: name: Okamoto, Soshi
name: Notsu, Yuta
name: Maehara, Hiroyuki
name: Namekata, Kosuke
name: Honda, Satoshi
name: Ikuta, Kai
name: Nogami, Daisaku
name: Shibata, Kazunari
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We report the latest statistical analyses of superflares on solar-type (G-type main-sequence; effective temperature is 5100 - 6000 K) stars using all of the $Kepler$ primary mission data, and $Gaia$-DR2 (Data Release 2) catalog. We updated the flare detection method from our previous studies by using high-pass filter to remove rotational variations caused by starspots. We also examined the sample biases on the frequency of superflares, taking into account gyrochronology and flare detection completeness. The sample size of solar-type stars and Sun-like stars (effective temperature is 5600 - 6000 K and rotation period is over 20 days in solar-type stars) are $\sim$4 and $\sim$12 times, respectively, compared with Notsu et al. (2019, ApJ, 876, 58). As a result, we found 2341 superflares on 265 solar-type stars, and 26 superflares on 15 Sun-like stars: the former increased from 527 to 2341 and the latter from 3 to 26 events compared with our previous study. This enabled us to have a more well-established view on the statistical properties of superflares. The observed upper limit of the flare energy decreases as the rotation period increases in solar-type stars. The frequency of superflares decreases as the stellar rotation period increases. The maximum energy we found on Sun-like stars is $4 \times 10^{34}$ erg. Our analysis of Sun-like stars suggest that the Sun can cause superflares with energies of $\sim 7 \times 10^{33}$ erg ($\sim$X700-class flares) and $\sim 1 \times 10^{34}$ erg ($\sim$X1000-class flares) once every $\sim$3,000 years and $\sim$6,000 years, respectively.
description: 49 pages, 22 figures, 6 tables, supplementary table, Accepted for publication in The Astrophysical Journal (03-Nov-2020)
The effects of dot/line and bar/line combination graphs on proficiency of search, evaluation, and choice of graphical format in a policy decision context
Creators: name: Forrester, Darlene Aura
Publisher: name: University of British Columbia
Year: 2009

description: Graphs reveal complex data by displaying answers to questions concerning details, relationships, and trends (Wainer, 1992). This study evaluated combination bar/line versus dot/line graphical formats in terms of presenting information at these three search levels. The formats were explored for proficiency, time to complete, and preference when presenting information. Forty volunteer trustees of health care organizations were randomly assigned to two groups. The Graphicacy Test (Wainer, 1980) was examined as a pretest for graphic research. Neither graphicacy, education, service on a board, or financial management experience showed a significant influence. Each group read financial reports in two presentations: one in combination bar/line and the other in combination dot/line graphical format. The findings were discussed in terms of their practical application. The bar/line graph was found to be significantly better than the dot/line format for the proficient search for details, relationships, and trends when in the second presentation. The subjects evaluated the formats in terms of ease of understanding and use. After experiencing both formats, they rated the bar/line significantly higher than the dot/line for clarity, readability, accuracy and overall satisfaction. The trustees chose the combination bar/line format for presenting information in the experiment and in their own organizations.
Non-extensive processes associated with heating of the Galactic disc
Creators: name: Viana, C. A. P.
name: de Freitas, D. B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyse the mechanisms ruling galactic disc heating through the dynamics of space velocities $U$, $V$ and $W$, extracted from the Geneva-Copenhagen catalogue. To do this, we use a model based on non-extensive statistical mechanics, where we derive the probability distribution functions that quantify the non-Gaussian effects. Furthermore, we find that the deviation $q-1$ at a given stellar age follows non-random behaviour. As a result, the $q$-index behaviour indicates that the vertical component $W$, perpendicular to the Galactic plane, does not ``heat up'' at random, which is in disagreement with previous works that attributed the evolution of $W$ to randomness. Finally, our results bring a new perspective to this matter and open the way for studying Galactic kinematic components through the eyes of more robust statistical models that consider non-Gaussian effects.
description: 7 pages, 3 figures, 2 tables. Accepted to EPL
Posterior mean and variance approximation for regression and time series problems
Creators: name: Triantafyllopoulos, K.
name: Harrison, P. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Methodology (stat.ME)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: This paper develops a methodology for approximating the posterior first two moments of the posterior distribution in Bayesian inference. Partially specified probability models, which are defined only by specifying means and variances, are constructed based upon second-order conditional independence, in order to facilitate posterior updating and prediction of required distributional quantities. Such models are formulated particularly for multivariate regression and time series analysis with unknown observational variance-covariance components. The similarities and differences of these models with the Bayes linear approach are established. Several subclasses of important models, including regression and time series models with errors following multivariate $t$, inverted multivariate $t$ and Wishart distributions, are discussed in detail. Two numerical examples consisting of simulated data and of US investment and change in inventory data illustrate the proposed methodology.
description: 25 pages, 2 figures, 2 tables
การพัฒนาทักษะการอ่านเพื่อความเข้าใจด้วยการ์ตูนชาดกตามแนวทางการสอนแบบบูรณาการของเมอร์ด็อค (MIA) สำหรับนิสิตชั้นปีที่ 1 วิทยาลัยสงฆ์พุทธชินราช มหาวิทยาลัยมหาจุฬาลงกรณราชวิทยาลัย
Creators: name: พระอมร ธนาชัยกำจร
Publisher: name: มหาวิทยาลัยมหาจุฬาลงกรณราชวิทยาลัย วิทยาเขตนครสวรรค์
Year: 2024
Subjects: การ์ตูน
การอ่านภาษาอังกฤษเพื่อความเข้าใจ
ชาดก
วิธีสอนอ่านแบบบูรณาการของเมอร์ด็อค

description: The Journal of Research and Academics, 7, 1, 67-84
The inertia of heat and its role in the dynamics of dissipative collapse
Creators: name: Herrera, L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: The decreasing of the inertial mass density, established in the past for dissipative fluids, is found to be produced by the ``inertial'' term of the transport equation. Once the transport equation is coupled to the dynamical equation one finds that the contribution of the inertial term diminishes the effective inertial mass and the ``gravitational'' force term, by the same factor. An intuitive picture, and prospective applications of this result to astrophysical scenarios are discussed.
description: Latex file. To appear in Int.J.Mod.Phys.D. Year of reference [1] corrected
Additive Tree-Structured Conditional Parameter Spaces in Bayesian Optimization: A Novel Covariance Function and a Fast Implementation
Creators: name: Ma, Xingchen
name: Blaschko, Matthew B.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Bayesian optimization (BO) is a sample-efficient global optimization algorithm for black-box functions which are expensive to evaluate. Existing literature on model based optimization in conditional parameter spaces are usually built on trees. In this work, we generalize the additive assumption to tree-structured functions and propose an additive tree-structured covariance function, showing improved sample-efficiency, wider applicability and greater flexibility. Furthermore, by incorporating the structure information of parameter spaces and the additive assumption in the BO loop, we develop a parallel algorithm to optimize the acquisition function and this optimization can be performed in a low dimensional space. We demonstrate our method on an optimization benchmark function, on a neural network compression problem, on pruning pre-trained VGG16 and ResNet50 models as well as on searching activation functions of ResNet20. Experimental results show our approach significantly outperforms the current state of the art for conditional parameter optimization including SMAC, TPE and Jenatton et al. (2017).
description: Code available at https://github.com/maxc01/addtree. arXiv admin note: substantial text overlap with arXiv:2006.11771
Conformal radii for conformal loop ensembles
Creators: name: Schramm, Oded
name: Sheffield, Scott
name: Wilson, David B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The conformal loop ensembles CLE(k), defined for k in [8/3, 8], are random collections of loops in a planar domain which are conjectured scaling limits of the O(n) loop models. We calculate the distribution of the conformal radii of the nested loops surrounding a deterministic point. Our results agree with predictions made by Cardy and Ziff and by Kenyon and Wilson for the O(n) model. We also compute the expectation dimension of the CLE(k) gasket, which consists of points not surrounded by any loop, to be 2-(8-k)(3k-8)/32k, which agrees with the fractal dimension given by Duplantier for the O(n) model gasket.
description: 12 pages, v4 updates references
USTOZ KOMPOZITOR ULUG'BEK MUSAYEV IJODIGA BIR NAZAR
Creators: name: Atadjanov, Muxammad
Publisher: name: Zenodo
Year: 2024

description: Ush bu maqolada o’zbek musiqa madaniyati va kompozitorlik ijodida muhim ijodkor shaxslardan biri bo’lmish Ulug‘bek Musayevning hayot yo’li va ijodiga doir fikr-mulohazalar yoritiladi.
การพัฒนากิจกรรมศิลปะบนฐานทางเลือกเพื่อส่งเสริมการสร้างสรรค์ศิลปะสำหรับเด็กอายุ 9-12 ปี
Creators: name: สุภาพรรณ วงศ์ศักดิ์ศิริกุล
Publisher: name: มหาวิทยาลัยมหาจุฬาลงกรณราชวิทยาลัย วิทยาเขตนครสวรรค์
Year: 2024
Subjects: กิจกรรมศิลปะบนฐานทางเลือก
การสร้างสรรค์ศิลปะ
เด็กอายุ 9-12 ปี

description: The Journal of Research and Academics, 7, 1, 85-100
การพัฒนาเว็บไซต์การฝึกอบรมออนไลน์เพื่อเสริมสร้างศักยภาพด้านการประกันคุณภาพการศึกษาของครูและบุคลากรทางการศึกษาสังกัดสำนักงานเขตพื้นที่การศึกษาประถมศึกษากำแพงเพชร เขต 2
Creators: name: ปวีณวัชร์ ขุนเทียนเขมชาติ
Publisher: name: มหาวิทยาลัยมหาจุฬาลงกรณราชวิทยาลัย วิทยาเขตนครสวรรค์
Year: 2024
Subjects: การพัฒนาเว็บไซต์การฝึกอบรมออนไลน์
การเสริมสร้างศักยภาพด้านการประกัน
คุณภาพการศึกษา

description: The Journal of Research and Academics, 7, 1, 101-114
Antikaon angular distributions in the reaction $γd \to K^-Θ^+p \to K^-K^+np$ near the threshold and the parity of the $Θ^+$ pentaquark
Creators: name: Paryev, E. Ya.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Within spectator model we study the reaction $γd \to K^-Θ^+p \to K^-K^+np$ in the threshold energy region. We present the predictions for the exclusive and inclusive antikaon angular distributions in the laboratory system for this reaction calculated for two possible parity states of the $Θ^+$ resonance at 1.5 and 1.75 GeV beam energies with and without imposing the relevant kinematical cuts on those parts of the sampled phase space where contribution from the main background sources associated with the $ϕ(1020)$, $Λ(1520)$ production as well as with the $K^-p$--rescattering in the final state, is expected to be dominant. We show that under chosen kinematics these distributions are sensitive to the $Θ^+$ parity and, therefore, can be used as a filter for the determination of its parity.
description: 18 pages, 8 figures; will be published in Phys.Atom.Nucl_4_2006
Multivariate stochastic volatility with Bayesian dynamic linear models
Creators: name: Triantafyllopoulos, K.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Finance (q-fin.ST)
subject: Applications (stat.AP)
subject: Methodology (stat.ME)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: This paper develops a Bayesian procedure for estimation and forecasting of the volatility of multivariate time series. The foundation of this work is the matrix-variate dynamic linear model, for the volatility of which we adopt a multiplicative stochastic evolution, using Wishart and singular multivariate beta distributions. A diagonal matrix of discount factors is employed in order to discount the variances element by element and therefore allowing a flexible and pragmatic variance modelling approach. Diagnostic tests and sequential model monitoring are discussed in some detail. The proposed estimation theory is applied to a four-dimensional time series, comprising spot prices of aluminium, copper, lead and zinc of the London metal exchange. The empirical findings suggest that the proposed Bayesian procedure can be effectively applied to financial data, overcoming many of the disadvantages of existing volatility models.
description: 24 pages, 3 figures, 2 tables
Expansion of a Bose-Einstein Condensate in the Presence of Disorder
Creators: name: Shapiro, B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Expansion of a Bose-Einstein condensate (BEC) is studied, in the presence of a random potential. The expansion is controlled by a single parameter, $(μτ_{eff} /\hbar)$, where $μ$ is the chemical potential, prior to the release of the BEC from the trap, and $τ_{eff}$ is a transport relaxation time which characterizes the strength of the disorder. Repulsive interactions (nonlinearity) facilitate transport and can lead to diffusive spreading of the condensate which, in the absence of interactions, would have remained localized in the vicinity of its initial location.
Electron-phonon interaction in Graphite Intercalation Compounds
Creators: name: Boeri, Lilia
name: Bachelet, Giovanni B.
name: Giantomassi, Matteo
name: Andersen, Ole K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Motivated by the recent discovery of superconductivity in Ca- and Yb-intercalated graphite (CaC$_{6}$ and YbC$_{6}$) and from the ongoing debate on the nature and role of the interlayer state in this class of compounds, in this work we critically study the electron-phonon properties of a simple model based on primitive graphite. We show that this model captures an essential feature of the electron-phonon properties of the Graphite Intercalation Compounds (GICs), namely, the existence of a strong dormant electron-phonon interaction between interlayer and $π^{\ast}$ electrons, for which we provide a simple geometrical explanation in terms of NMTO Wannier-like functions. Our findings correct the oversimplified view that nearly-free-electron states cannot interact with the surrounding lattice, and explain the empirical correlation between the filling of the interlayer band and the occurrence of superconductivity in Graphite-Intercalation Compounds.
description: 13 pages, 12 figures, submitted to Phys. Rev. B
Quantum Lifshitz point in the infinite dimensional Hubbard model
Creators: name: Günther, F.
name: Seibold, G.
name: Lorenzana, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that the Gutzwiller variational wave function is surprisingly accurate for the computation of magnetic phase boundaries in the infinite dimensional Hubbard model. This allows us to substantially extend known phase diagrams. For both the half-hypercubic and the hypercubic lattice a large part of the phase diagram is occupied by an incommensurate phase, intermediate between the ferromagnetic and the paramagnetic phase. In case of the hypercubic lattice the three phases join at a new quantum Lifshitz point at which the order parameter is critical and the stiffness vanishes.
description: 4 pages, 3 figures
Critical points in the $RP^{N-1}$ model
Creators: name: Diouane, Youness
name: Lamsen, Noel
name: Delfino, Gesualdo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The space of solutions of the exact renormalization group fixed point equations of the two-dimensional $RP^{N-1}$ model, which we recently obtained within the scale invariant scattering framework, is explored for continuous values of $N\geq 0$. Quasi-long-range order occurs only for $N=2$, and allows for several lines of fixed points meeting at the BKT transition point. A rich pattern of fixed points is present below $N^*=2.24421..$, while only zero temperature criticality in the $O(N(N+1)/2-1)$ universality class can occur above this value. The interpretation of an extra solution at $N=3$ requires the identitication of a path to criticality specific to this value of $N$.
A History and Informal Assessment of the Slacker Astronomy Podcast
Creators: name: Price, A.
name: Gay, P.
name: Searle, T.
name: Brissenden, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Slacker Astronomy is a weekly podcast that covers a recent astronomical news event or discovery. The show has a unique style consisting of irreverent, over-the-top humor combined with a healthy dose of hard science. According to our demographic analysis, the combination of this style and the unique podcasting distribution mechanism allows the show to reach audiences younger and busier than those reached via traditional channels. We report on the successes and challenges of the first year of the show, and provide an informal assessment of its role as a source for astronomical news and concepts for its approximately 15,500 weekly listeners.
description: 14 pages
The use of information engineering as a framework for analyzing records in electronic form
Creators: name: Bellyk, Jayne
Publisher: name: University of British Columbia
Year: 2009

description: This thesis examines an approach and a methodology used by information technology professionals to develop information systems. Information engineering is a methodology for developing information systems following a specific process. It does not set out to create or manage records, yet it does have significance to archivists as a framework for analyzing information and records in electronic form. The framework that information engineering extends to archivists is one that links administrative goals and business functions to individual activities and acts. The analysis of system documentation from an actual development project reveals how these relationships are created and maintained. It also describes and presents the lexicon and graphic representations of information management as it follows a particular action through the phases of development. Finally, it reveals the fundamental difference between traditional paper records and data in electronic form. The separation of content from structure is a result of the demands of database technology for storage and retrieval, and is a significant issue to be faced in developing methods for the management and preservation of electronic records. The analysis also brings to light the importance of possessing this knowledge before establishing appraisal or description approaches or electronic record management program strategies. The study concludes that information engineering provides a useful framework for archivists in the analysis of information and records in electronic form, and that this understanding is essential to the evolution of archival knowledge and the responsibility of archivists to ensure the reliability, authenticity, availability and integrity of records in an electronic environment.
Systematic errors in the determination of Hubble constant due to the asphericity and non-isothermality of clusters of galaxies
Creators: name: Wang, Y. -G.
name: Fan, Z. -H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Joint analyses on X-ray and Sunyaev-Zel'dovich (SZ) effect of a cluster of galaxies can give rise to an estimate on the angular diameter distance to the cluster. With the redshift information of the cluster, the Hubble constant $H_0$ can then be derived. Furthermore, such measurements on a sample of clusters with a range of redshift can potentially be used to discriminate different cosmological models. In this paper, we present statistical studies on the systematic errors in the determination of $H_0$ due to the triaxiality and non-isothermality of clusters of galaxies. Different from many other studies that assume artificially a specific distribution for the intracluster gas, we start from the triaxial model of dark matter halos obtained from numerical simulations. The distribution of the intracluster gas is then derived under the assumption of the hydrodynamic equilibrium. For the equation of state of the intracluster gas, both the isothermal and the polytropic cases are investigated. We run Monte Carlo simulations to generate samples of clusters according to the distributions of their masses, axial ratios, concentration parameters, as well as line-of-sight directions. To mimic observations, the estimation of the Hubble constant is done by fitting X-ray and SZ profiles of a triaxial cluster with the isothermal and spherical $β$-model. We find that for a sample of clusters with $M=10^{14}h^{-1}\hbox{M}_{\odot}$ and $z=0.1$, the value of the estimated $H_0$ is positively biased with $H_0^{peak}(estimated)\approx 1.05H_0(true)$ and $H_0^{ave}(estimated)\approx 1.05H_0(true)$ for the isothermal case. For the polytropic case with $γ=1.15$, the bias is rather large with $H_0^{peak}(estimated)\approx 1.35H_0(true)$ and $H_0^{ave}(estimated)\approx 3H_0(true)$. (abridged)
description: 33 pages, 14 figures. Accepted for publication in ApJ
Ausdifferenzierung und Konsolidierung
Creators: name: Klewin, Gabriele
name: Heinrich, Martin
Publisher: name: WE_OS Jahrbuch – Jahresbericht Forschungs- und Entwicklungsplan der Wissenschaftlichen Einrichtung Oberstufen-Kolleg der Universität Bielefeld
Year: 2023

description: Der Beitrag skizziert die Weiterentwicklung des Forschungs- und Entwicklungsmodells für das Oberstufen-Kolleg und konzentriert sich dabei auf die neu eingerichteten Entwicklungsprojekte. Im Anschluss werden die aktuellen und geplanten Projekte des Forschungs- und Entwicklungsplans vorgestellt und Entwicklungsfelder für die weitere Arbeit beschrieben. Der abschließende Ausblick fokussiert insbesondere die für das Jubiläum der beiden Versuchsschulen Oberstufen-Kolleg und Laborschule im Jahr 2024 geplanten Veranstaltungen der Wissenschaftlichen Einrichtung Oberstufen-Kolleg.

The article outlines the further development of the research and development model for the Oberstufen-Kolleg, focussing on the newly established development projects. The current and planned projects of the research and development plan are then presented and areas of development for further work are described. The final outlook focuses in particular on the events planned for the anniversary of the two experimental schools, the Oberstufen-Kolleg and the Laborschule [laboratory school], in 2024.
description: WE_OS Jahrbuch – Jahresbericht Forschungs- und Entwicklungsplan der Wissenschaftlichen Einrichtung Oberstufen-Kolleg der Universität Bielefeld, Bd. 6 (2023): Professionalisierung durch Praxisforschung?
Aspects of Hadron Physics
Creators: name: Roberts, C. D.
name: Bhagwat, M. S.
name: Wright, S. V.
name: Holl, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Detailed investigations of the structure of hadrons are essential for understanding how matter is constructed from the quarks and gluons of Quantum chromodynamics (QCD), and amongst the questions posed to modern hadron physics, three stand out. What is the rigorous, quantitative mechanism responsible for confinement? What is the connection between confinement and dynamical chiral symmetry breaking? And are these phenomena together sufficient to explain the origin of more than 98% of the mass of the observable universe? Such questions may only be answered using the full machinery of nonperturbative relativistic quantum field theory. This contribution provides a perspective on progress toward answering these key questions. In so doing it will provide an overview of the contemporary application of Dyson-Schwinger equations in Hadron Physics. The presentation assumes that the reader is familiar with the concepts and notation of relativistic quantum mechanics, with the functional integral formulation of quantum field theory and with regularisation and renormalisation in its perturbative formulation.
description: 64 pages and numerous figures. Published in "Hadron Structure and Nonperturbative QCD", the proceedings of the 44th Winter School on Theoretical Physics (IUTP 44) Schladming, Austria: 11-18 March, 2006
Professionalisierung durch Praxisforschung?
Creators: name: Heinrich, Martin
name: Klewin, Gabriele
Publisher: name: WE_OS Jahrbuch – Jahresbericht Forschungs- und Entwicklungsplan der Wissenschaftlichen Einrichtung Oberstufen-Kolleg der Universität Bielefeld
Year: 2023

description: Das Zusammenspiel von Forschung und Praxis wird mit Blick auf die Professionalisierung von Lehrkräften immer wieder thematisiert. Deshalb soll dies zunächst – in seinen zum Teil gegenläufigen Tendenzen – allgemein beleuchtet werden (Kap. 1). Anschließend (Kap. 2) wird anhand einer Einführung in die Beiträge des Jahrbuchs dargelegt, wie sich dieses Verhältnis von Forschung und Praxis spezifisch mit Blick auf die Professionalisierungsansprüche und die jeweilige Thematik der Beiträge ausdifferenzieren lässt.

The interplay between research and practice is a recurring theme with regard to the professionalisation of teachers. For this reason, this interplay will first be examined in general terms – in its sometimes contradictory tendencies (chapter 1). Subsequently (chapter 2), an introduction to the contributions to the yearbook will show how this relationship between research and practice can be differentiated specifically with regard to the professionalisation claims and the respective topics of the contributions.
description: WE_OS Jahrbuch – Jahresbericht Forschungs- und Entwicklungsplan der Wissenschaftlichen Einrichtung Oberstufen-Kolleg der Universität Bielefeld, Bd. 6 (2023): Professionalisierung durch Praxisforschung?
Space-scale Exploration of the Poor Reliability of Deep Learning Models: the Case of the Remote Sensing of Rooftop Photovoltaic Systems
Creators: name: Kasmi, Gabriel
name: Dubus, Laurent
name: Drenan, Yves-Marie Saint
name: Blanc, Philippe
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Photovoltaic (PV) energy grows rapidly and is crucial for the decarbonization of electric systems. However, centralized registries recording the technical characteristifs of rooftop PV systems are often missing, making it difficult to accurately monitor this growth. The lack of monitoring could threaten the integration of PV energy into the grid. To avoid this situation, the remote sensing of rooftop PV systems using deep learning emerged as a promising solution. However, existing techniques are not reliable enough to be used by public authorities or transmission system operators (TSOs) to construct up-to-date statistics on the rooftop PV fleet. The lack of reliability comes from the fact that deep learning models are sensitive to distribution shifts. This work proposes a comprehensive evaluation of the effects of distribution shifts on the classification accuracy of deep learning models trained to detect rooftop PV panels on overhead imagery. We construct a benchmark to isolate the sources of distribution shift and introduce a novel methodology that leverages explainable artificial intelligence (XAI) and decomposition of the input image and model's decision in terms of scales to understand how distribution shifts affect deep learning models. Finally, based on our analysis, we introduce a data augmentation technique meant to improve the robustness of deep learning classifiers to varying acquisition conditions. We show that our proposed approach outperforms competing methods. We discuss some practical recommendations for mapping PV systems using overhead imagery and deep learning models.
description: 24 pages, 13 figures, 5 tables, manuscript submitted to Environmental Data Science
A Calculation of the Sigma Meson Mass in Nuclear Matter
Creators: name: Morones-Ibarra, J. R.
name: Santos-Guevara, Ayax
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate the mass and width of the sigma meson in nuclear medium by considering that it couples to two virtual pions and to a pair of nucleon-antinucleon states and to particle-hole states. The mass is calculated by using the spectral function in the Walecka model, finding that it is about 380MeV. In addition, we obtain the value of 340MeV for the width of its spectral function. We find that there is a reduction in the mass value compared with that in vacuum. This result is consistent with those reported by other authors who have used different models predicting a decreasing of the mass as a function of the density.
description: 11 pages, 3 figures
Ist das noch Praxisforschung?
Creators: name: Klewin, Gabriele
name: Heinrich, Martin
Publisher: name: WE_OS Jahrbuch – Jahresbericht Forschungs- und Entwicklungsplan der Wissenschaftlichen Einrichtung Oberstufen-Kolleg der Universität Bielefeld
Year: 2023

description: Das Forschungs- und Entwicklungsmodell des Oberstufen-Kollegs hat sich in den letzten Jahren erneut weiterentwickelt und sich dabei in seinen Formaten ausdifferenziert. In diesem Beitrag werden die unterschiedlichen Formate beschrieben und auf den Ansatz der Praxisforschung bezogen, da dieser grundlegend für das Forschungs- und Entwicklungsmodell ist. Der Abgleich der Formate mit Kriterien für Praxisforschung macht deutlich, dass nicht alle den Maximen der Praxisforschung entsprechen, gleichwohl aber der Logik von Forschung und Entwicklung folgen. Deutlich wird daran auch, dass die Entwicklung der verschiedenen Formate selbst der Logik eines Forschungs- und Entwicklungsprozesses folgt.


The research and development model of the Oberstufen-Kolleg in Bielefeld, Germany, has continued to evolve in recent years and has become more differentiated in terms of its formats. This article describes the different formats and relates them to practitioner research, as this concept is fundamental to the research and development model. In comparing the formats with the criteria for practitioner research it becomes evident that not all of them correspond to the maxims of practitioner research, but nevertheless follow the logic of research and development. It also becomes clear that the development of the different formats itself follows the logic of a research and development process.
description: WE_OS Jahrbuch – Jahresbericht Forschungs- und Entwicklungsplan der Wissenschaftlichen Einrichtung Oberstufen-Kolleg der Universität Bielefeld, Bd. 6 (2023): Professionalisierung durch Praxisforschung?
The HERMES-Technologic and Scientific Pathfinder
Creators: name: Fiore, F.
name: Burderi, L.
name: Lavagna, M.
name: Bertacin, R.
name: Evangelista, Y.
name: Campana, R.
name: Fuschino, F.
name: Lunghi, P.
name: Monge, A.
name: Negri, B.
name: Pirrotta, S.
name: Puccetti, S.
name: Sanna, A.
name: HERMES-TP, the
name: Collaborations, HERMES-SP
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: HERMES-TP/SP (High Energy Rapid Modular Ensemble of Satellites Technologic and Scientific Pathfinder) is a constellation of six 3U nano-satellites hosting simple but innovative X-ray detectors, characterized by a large energy band and excellent temporal resolution, and thus optimized for the monitoring of Cosmic High Energy transients such as Gamma Ray Bursts and the electromagnetic counterparts of Gravitational Wave Events, and for the determination of their positions. The projects are funded by the Italian Ministry of University and Research and by the Italian Space Agency, and by the European Union Horizon 2020 Research and Innovation Program under Grant Agreement No. 821896. HERMES-TP/SP is an in-orbit demonstration, that should be tested starting from 2022. It is intrinsically a modular experiment that can be naturally expanded to provide a global, sensitive all sky monitor for high-energy transients.
description: 15 pages, 3 figures, Proceedings of SPIE Astronomical Telescopes and Instrumentation 2020
Migration jumps of planets in transition disks
Creators: name: Rometsch, Thomas
name: Rodenkirch, Peter J.
name: Kley, Wilhelm
name: Dullemond, Cornelis P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Transition disks form a special class of protoplanetary disks that are characterized by a deficiency of disk material close to the star. In a subgroup, inner holes in these disks can stretch out to a few tens of au while there is still mass accretion onto the central star observed. We analyse the proposition that this type of wide transition disks is generated by the interaction of the disk with a system of embedded planets. We performed 2D hydrodynamics simulations of a flat disk using either a locally isothermal equation of state or considering also radiative effects. Two 3 to 9 Jupiter mass planets were embedded in the disk and their dynamical evolution due to disk-planet interaction was followed for over 100 000 years. The simulations account for mass accretion onto the star and planets. We included models with parameters geared to the system PDS 70. To assess the observability of features in our models we performed synthetic ALMA observations. For systems with a more massive inner planet there are phases where both planets migrate outward engaged in a 2:1 mean motion resonance via the Masset-Snellgrove mechanism. In sufficiently massive disks the formation of a vortex in the outer disk can trigger rapid outward migration of the outer planet where its distance increases by tens of au within a few thousand years. Later, the outer planet migrates back inwards settling again into resonance with the inner planet. We call this emerging composite phenomenon a 'migration jump'. Outward migration and the migration jumps are accompanied by a high mass accretion rate onto the star. The synthetic images reveal numerous substructures depending on the type of dynamical behaviour. Our results suggest that the outward migration of two embedded planets is a prime candidate for the explanation of the observed high stellar mass accretion rate in wide transition disks.
description: 21 pages, 16 figures, accepted for publication in A&A
Efficient Degradation and Expression Prioritization with Small RNAs
Creators: name: Mitarai, Namiko
name: Andersson, Anna M. C.
name: Krishna, Sandeep
name: Semsey, Szabolcs
name: Sneppen, Kim
Publisher: name: arXiv
Year: 2006
Subjects: subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences

description: We build a simple model for feedback systems involving small RNA (sRNA) molecules based on the iron metabolism system in the bacterium E. coli, and compare it with the corresponding system in H. pylori which uses purely transcriptional regulation. This reveals several unique features of sRNA based regulation that could be exploited by cells. Firstly, we show that sRNA regulation can maintain a smaller turnover of target mRNAs than transcriptional regulation, without sacrificing the speed of response to external shocks. Secondly, we propose that a single sRNA can prioritize the usage of different target mRNAs. This suggests that sRNA regulation would be more common in more complex systems which need to co-regulate many mRNAs efficiently.
description: 7 figures. More discussion added