cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Διερεύνηση των αντιλήψεων των φοιτητών για την εκπαιδευτική διαδικασία σε περίοδο πανδημίας: Η περίπτωση μιας Σχολής Μηχανικών

title: Analysing students' perceptions of the educational process through a pandemic: The case of an Engineering School
Creators: name: Ρεκουδης Νικολαος
Publisher: name: Technical University of Crete
Year: 2022

description:     H πανδημία του covid-19 και τα μέτρα που ελήφθησαν για την αντιμετώπισή του, έχουν διαφοροποιήσει τον τρόπο λειτουργίας του εκπαιδευτικού συστήματος σε όλα τα επίπεδα, επηρεάζοντας τη μάθηση, την εκπαίδευση αλλά και την ψυχολογία διδασκόντων και διδασκόμενων. Στόχος της παρούσας διπλωματικής εργασίας είναι η διερεύνηση της αντίληψης των φοιτητών την περίοδο εκπαίδευσης μέσω πανδημίας σε μια Σχολή Μηχανικών. Επιδιώχθηκε η αποτύπωση της αντίληψης των φοιτητών σε όλες τις συνιστώσες της εκπαίδευσης, δηλαδή διδασκαλία και μάθηση, εξετάσεις και επιδόσεις, επικοινωνία και συνεργασία, εκπαιδευτικό υλικό, συστήματα υποστήριξης ασύγχρονης και σύγχρονης εκπαίδευσης, υποστηρικτικά τεχνολογικά εργαλεία, κλπ.
    Πραγματοποιήθηκε πρωτογενής έρευνα σε ικανό δείγμα φοιτητών με ειδικά σχεδιασμένο ερωτηματολόγιο, ενώ η ανάλυση βασίστηκε στην πολυκριτήρια μέθοδο MUSA και στο μοντέλο ποιότητας του KANO με στόχο αφενός την ανάδειξη των διαστάσεων που ικανοποιούν / δυσαρεστούν τους φοιτητές και αφετέρου την ταξινόμηση των διαστάσεων στα 3 επίπεδα ποιότητας του KANO (αναμενόμενης ποιότητας, επιθυμητής ποιότητας και ελκυστικής ποιότητας). Όπως είναι γνωστό εάν μία υπηρεσία ικανοποιεί τις απαιτήσεις αυτό δεν σημαίνει κατ’ ανάγκη ότι δημιουργεί ικανοποίηση. Η παρούσα εργασία εξέτασε την ικανοποίηση των φοιτητών όσον αφορά την αντιληπτή ποιότητα. Ουσιαστικά, επιχειρήθηκε να δοθεί απάντηση στο ερώτημα «Τι είναι αυτό που προσδοκούν οι φοιτητές μιας Σχολής Μηχανικών εν μέσω πανδημίας;»
    H προσέγγιση αυτή μπορεί να αναδείξει τις προτεραιότητες βελτίωσης της εκπαιδευτικής διαδικασίας εν μέσω της πανδημίας που ξεκίνησε το Φεβρουάριο-Μάρτιο του 2020 και συνεχίζεται, καθώς και να υποδείξει τα βασικά, μονοδιάστατα και ελκυστικά χαρακτηριστικά ποιότητας της προσπάθειας που καταβάλλεται.
Homosexualität im Spannungsfeld von "zeitgemäß" und "schriftgemäß"
Creators: name: Schürger, Wolfgang
Publisher: name: Werkstatt Schwule Theologie
Year: 1970

description: Werkstatt Schwule Theologie, Bd. 1 Nr. 2 (1994): Werkstatt Schwule Theologie, Band 1, Heft 2
PT-symmetry Management in Oligomer Systems
Creators: name: Horne, R. L.
name: Cuevas, J.
name: Kevrekidis, P. G.
name: Whitaker, N.
name: Abdullaev, F. Kh.
name: Frantzeskakis, D. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We study the effects of management of the PT-symmetric part of the potential within the setting of Schrödinger dimer and trimer oligomer systems. This is done by rapidly modulating in time the gain/loss profile. This gives rise to a number of interesting properties of the system, which are explored at the level of an averaged equation approach. Remarkably, this rapid modulation provides for a controllable expansion of the region of exact PT-symmetry, depending on the strength and frequency of the imposed modulation. The resulting averaged models are analyzed theoretically and their exact stationary solutions are translated into time-periodic solutions through the averaging reduction. These are, in turn, compared with the exact periodic solutions of the full non-autonomous PT-symmetry managed problem and very good agreement is found between the two.
กระบวนการปฏิสัมพันธ์อย่างมีจุดมุ่งหมาย : การประยุกต์ใช้เพื่อการฟื้นสภาพหลังผ่าตัดนิ่วในไต
Creators: name: ชนุกร แก้วมณี
Publisher: name: ศูนย์อนามัยที่ 9 นครราชสีมา
Year: 2563
Subjects: นิ่วในไต
การฟื้นฟูสภาพหลังผ่าตัด
กระบวนการปฏิสัมพันธ์อย่างมีจุดมุ่งหมาย

description: วารสารศูนย์อนามัยที่ 9, 14, 35, 450-463
A full view on the dynamics of an impurity coupled to two one-dimensional fermionic baths
Creators: name: Stefanini, Martino
name: Capone, Massimo
name: Silva, Alessandro
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We consider a model for the motion of an impurity interacting with two parallel, one-dimensional (bosonized) fermionic baths. The impurity is able to move along any of the baths, and to jump from one to the other. We provide a perturbative expression for the state evolution of the system when the impurity is injected in one of the baths, with a given wave packet. The nontrivial choice of the unperturbed dynamics makes the approximation formally infinite-order in the impurity-bath coupling, allowing us to reproduce the orthogonality catastrophe. We employ the result for the state evolution to observe the dynamics of the impurity and its effect on the baths, in particular in the case when the wave packet is Gaussian. We observe and characterize the propagation of the impurity along the baths and the hopping between them. We also analyze the dynamics of the bath density and momentum density (i.e. the particle current), and show that fits an intuitive semi-classical interpretation. We also quantify the correlation that is established between the baths by calculating the inter-bath, equal-time spatial correlation functions of both bath density and momentum, finding a complex pattern. We show that this pattern contains information on both the impurity motion and on the baths themselves, and that these can be unveiled by taking appropriate "slices" of the time evolution.
description: 26 pages, 14 figures
Sustainability of Water Resources for the Poor
Creators: name: Gallardo, Susan
name: Abulencia, James Patrick
name: Abraham, Nithin
name: Caraccio, Anne
name: Ruffini, Nicholas
name: McDonnell, Kevin
name: Tañala, Francis
Publisher: name: Columbia University
Year: 2010
Subjects: subject: Service learning
subject: Drinking water--Purification
subject: Poor--Health and hygiene
subject: Water resources development--Planning
subject: Water resources development--Management
subject: Public health
subject: Chemical engineering
subject: FOS: Chemical engineering

description: The quality of water resources for drinking water is a significant concern in many rural communities around the world. These contaminated resources directly affect natives by causing adverse health effects such as diarrhea and other gastrointestinal diseases. Potential solutions such as sand filtration, chlorination, and solar disinfection are effective technologies to purify drinking water. Another method includes reverse osmosis which is the main method for water filtration in the Philippines. However, these technologies are not feasible applications for poor communities mostly due to energy and cost concerns.

To address this need for sustainable water resources, in particular for a town named Nagcarlan in the Philippines, a service learning program is proposed to employ the knowledge of engineering students to use their technical skills to serve society and thus result in personal growth.  Students involved in this program have formulated a solution involving the development of a personal water filter to remove contaminants such as heavy metals using activated carbon derived from natural resources that are biodegradable and the product of recycling waste products. Sustainability of water resources is further achieved through a community outreach program with the poor communities. A successful outcome may further motivate a replication of the proposed solution to other impoverished towns within the Philippines, as well as other nations in order to service those without potable drinking water.
OWNERSHIP CONCENTRATION, BLOCKHOLDER IDENTITY, AND COMPANY RISK
Creators: name: MOHAMED FATHALLAH
name: HOUSSEM BOUZGARROU
Publisher: name: Zenodo
Year: 2023
Subjects: Ownership Structure, Ownership Concentration, Blockholder Identity, Family Ownership, Institutional Ownership Systematic Risk.

description: Abstract
Despite the growing research on the relationship between ownership structure and performance, research on ownership concentration and blockholder identity and their impact on company risk seems to be very limited. This paper examines the relationship between block ownership and blockholder identity and risk in Tunisian companies listed on the Tunis Stock Exchange. We showed a negative relationship between ownership concentration and company risk for all companies in our sample as well as a negative and significant effect between institutional ownership and risk for the listed financial companies in our sample. Moreover, we found that the presence of a family controlling shareholder is positively related to company risk, and this is for non-financial companies listed on the Tunisian stock market.
Automorphisms of products of toric varieties
Creators: name: Liendo, Alvaro
name: Arteche, Giancarlo Lucchini
Publisher: name: arXiv
Year: 2021
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14M25

description: We give an explicit description of the automorphism group of a product of complete toric varieties over an arbitrary field in terms of the respective automorphism groups of its components. More precisely, we prove that, up to permutation of isomorphic components, an automorphism of a product corresponds to a product of automorphisms of its components. We also reprove, in modern language, the classic result by Demazure describing the group-scheme of automorphisms of a complete toric variety over an arbitrary field.
description: v2: Final version, 7 pages. Modified the layout of the results and the introduction, but the math is the same
The Impacts of Using Business Information Systems on Operational Effectiveness in Hungary
Creators: name: Sasvari, Peter
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences
subject: H.1.1
subject: 94A15

description: Business expectations regarding the introduction of business information systems were investigated according to company size categories. The results clearly showed that according to the majority of the respondents the information supply for decision-makers improved. In contrast, business information systems as a means of improving competitiveness were only regarded by corporations, this aspect was only around the average in the other company size categories. The respondents evaluated to what extent the usage of business information system provided assistance for their economic analyses. The obtained results show that business information systems can be utilized well in controlling and reporting. There are differences in their judgement by size categories. Particularly corporations can take advantage of the support of business information systems mainly in the field of planning, plan-actual analysis and the exploration of cost reducing possibilities.
description: 5 pages
Black Holes In Young Stellar Clusters
Creators: name: Goswami, S.
name: Kiel, P.
name: Rasio, F. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present theoretical models for stellar black hole (BH) properties in young, massive star clusters. Using a Monte Carlo code for stellar dynamics, we model realistic star clusters with $N\simeq 5\times10^5$ stars and significant binary fractions (up to 50%) with self-consistent treatments of stellar dynamics and stellar evolution. We compute the formation rates and characteristic properties of single and binary BHs for various representative ages, cluster parameters, and metallicities. Because of dynamical interactions and supernova (SN) kicks, more single BHs end up retained in clusters compared to BHs in binaries. We also find that the ejection of BHs from a cluster is a strong function of initial density. In low-density clusters (where dynamical effects are negligible), it is mainly SN kicks that eject BHs from the cluster, whereas in high-density clusters (initial central density $ρ_c(0) \sim 10^5 \, M_\odot\, {\rm pc}^{-3} $ in our models) the BH ejection rate is enhanced significantly by dynamics. Dynamical interactions of binary systems in dense clusters also modify the orbital period and eccentricity distributions while also increasing the probability of a BH having a more massive companion.
Torus actions on manifolds with positive intermediate Ricci curvature
Creators: name: Mouillé, Lawrence
Publisher: name: arXiv
Year: 2021
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C20 (Primary), 57S25, 57N65, 58E10 (Secondary)

description: We study closed, simply connected manifolds with positive $2^\mathrm{nd}$-intermediate Ricci curvature and large symmetry rank. In odd dimensions, we show that they are spheres. In even dimensions other than $6$, we show that they must have positive Euler characteristic. Under stronger assumptions on the symmetry rank, we show that such even dimensional manifolds must have trivial odd degree integral cohomology, and if the second Betti number is no more than $1$, they are either spheres or complex projective spaces. In the process, we establish new tools for studying isometric actions on closed manifolds with positive $k^\mathrm{th}$-intermediate Ricci for values of $k \geq 2$. These tools include generalizations of the isotropy rank lemma, symmetry rank bound, and connectedness principle from the setting of positive sectional curvature.
description: typo corrected. Published in J. Lond. Math. Soc
Inflationary buildup of a vector field condensate and its cosmological consequences
Creators: name: Sanchez, Juan C. Bueno
name: Dimopoulos, Konstantinos
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Light vector fields during inflation obtain a superhorizon perturbation spectrum when their conformal invariance is appropriately broken. Such perturbations, by means of some suitable mechanism (e.g. the vector curvaton mechanism), can contribute to the curvature perturbation in the Universe and produce characteristic signals, such as statistical anisotropy, on the microwave sky, most recently surveyed by the Planck satellite mission. The magnitude of such characteristic features crucially depends on the magnitude of the vector condensate generated during inflation. However, the expectation value of this condensate has so-far been taken as a free parameter, lacking a definite prediction or a physically motivated estimate. In this paper, we study the stochastic evolution of the vector condensate and obtain an estimate for its magnitude. Our study is mainly focused in the supergravity inspired case when the kinetic function and mass of the vector boson is time-varying during inflation, but other cases are also explored such as a parity violating axial theory or a non-minimal coupling between the vector field and gravity. As an example, we apply our findings in the context of the vector curvaton mechanism and contrast our results with current observations.
description: 31 pages, no figures
ความสัมพันธ์ระหว่างความรู้ ทัศนคติ และพฤติกรรมการบริโภคอาหาร และการออกกำลังกาย ของผู้ใหญ่วัยกลางคนที่มีภาวะน้ำหนักเกินในชนบท
Creators: name: ฉวีวรรณ ศรีดาวเรือง
Publisher: name: ศูนย์อนามัยที่ 9 นครราชสีมา
Year: 2563
Subjects: ความรู้ ทัศนคติ และพฤติกรรม
การบริโภคอาหาร
การออกกำลังกาย

description: วารสารศูนย์อนามัยที่ 9, 14, 35, 464-482
Ion Trap Long-Range XY Model for Quantum State Transfer and Optimal Spatial Search
Creators: name: Lewis, Dylan
name: Banchi, Leonardo
name: Teoh, Yi Hong
name: Islam, Rajibul
name: Bose, Sougato
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Linear ion trap chains are a promising platform for quantum computation and simulation. The XY model with long-range interactions can be implemented with a single side-band Molmer-Sorensen scheme, giving interactions that decay as $1/r^α$, where $α$ parameterises the interaction range. Lower $α$ leads to longer range interactions, allowing faster long-range gate operations for quantum computing. However, decreasing $α$ causes an increased generation of coherent phonons and appears to dephase the effective XY interaction model. We characterise and show how to correct for this effect completely, allowing lower $α$ interactions to be coherently implemented. Ion trap chains are thus shown to be a viable platform for spatial quantum search in optimal $O(\sqrt{N})$ time, for $N$ ions. Finally, we introduce a $O(\sqrt{N})$ quantum state transfer protocol, with a qubit encoding that maintains a high fidelity.
description: 17 pages, 10 figures
Redesign of the logo and design of a new ergonomic hand tool enabled by systemic analysis of the Serra da Estrela PDO cheese uni
Creators: name: CARROLA, Tiago E. P.
name: VIEIRA, Fátima L.
name: COUVINHAS, Ana F.
name: COELHO, Denis A.
Publisher: name: CPH Conference : 11th International Symposium on Human Factors in Organisational Design and Management
Year: 2014

description: The work reported on this paper was aimed at improving the efficiency of a
semi-artisanal cheese production process. A systemic design analysis, presented in another paper (Carrola, Couvinhas & Coelho, 2014) triggered the development of design work. A discursive analysis aimed at creating alternative logos for the Serra da Estrela PDO (Protected Designation of Origin) cheese was developed. Observations following an ethnographic approach identified ergonomic risks in cheese making during the process of cutting excess chips, fostering the emergence of musculoskeletal disorders at the wrist. A tool that fits best to the task at hand was developed. A prototype of the new tool enabled collecting feedback from use in the work context, in order to feedback product development.
Barricade der academischen Legion am erzbischöflichen Palais am 26. Mai 1848; [1848]
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Vorlageform des Erscheinungsvermerks: Ausschliessend Vervielfältigung vorbehalten, J. Höfelich, Stadt. Bazar No. 427
Must Biodiversity Hot-Spots Be Social Not-Spots? Win-Win Ecology as Sustainable Social Policy
Creators: name: Geisler, Charles
Publisher: name: Columbia University
Year: 2010
Subjects: subject: National parks and reserves--Environmental aspects
subject: Quaternary Geologic Period
subject: Biodiversity conservation
subject: Nature conservation
subject: Sustainability
subject: Ecology
subject: FOS: Biological sciences
subject: Conservation biology

description: Reconciliation ecology, a family of socially inclusive conservation strategies that depart from traditional protected area management, is on trial. Skeptics find it problematic for a range of reasons, faulting it for lack of evidence and calling it a "bio-diversion" from the agenda of strict protected area expansion. The present paper has a dual agenda. Building on the work of Michael Rosenzweig and fortifying it with new information from different world regions, I write in support of re-embedding conservation in human-dominated landscapes.  Simultaneously, I suggest that current protected areas yield conservation refugees, environmental backlash, and set-backs to sustainability efforts.
การส่งเสริมโภชนาการของผู้ปกครองเด็กปฐมวัยในศูนย์พัฒนาเด็กเล็ก ตำบลนาฝาย อำเภอเมือง จังหวัดชัยภูมิ
Creators: name: ณัฐปภัสญ์ นวลสีทอง
Publisher: name: ศูนย์อนามัยที่ 9 นครราชสีมา
Year: 2563
Subjects: การส่งเสริมโภชนาการ
เด็กปฐมวัย
ผู้ปกครอง
ศูนย์พัฒนาเด็กเล็ก

description: วารสารศูนย์อนามัยที่ 9, 14, 35, 483-494
WISE Y Dwarfs As Probes of the Brown Dwarf-Exoplanet Connection
Creators: name: Beichman, C.
name: Gelino, Christopher R.
name: Kirkpatrick, J. Davy
name: Cushing, Michael C.
name: Dodson-Robinson, Sally
name: Marley, Mark S.
name: Morley, Caroline V.
name: Wright, E. L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have determined astrometric positions for 15 WISE-discovered late-type brown dwarfs (6 T8-9 and 9 Y dwarfs) using the Keck II telescope, the Spitzer Space Telescope, and the Hubble Space Telescope. Combining data from 8 to 20 epochs we derive parallactic and proper motions for these objects which put the majority within 15 parsecs. For ages greater than a few Gyr, as suggested from kinematic considerations, we find masses of 10-30 M$_{Jup}$ based on standard models for the evolution of low mass objects with a range of mass estimates for individual objects depending on the model in question. Three of the coolest objects have effective temperatures $\sim$ 350 K and inferred masses of 10-15 M$_{Jup}$. Our parallactic distances confirm earlier photometric estimates (Kirkpatrick et al. 2012) and direct measurements (Marsh et al. 2013, Beichman et al. 2013, Dupuy and Krauss 2013) and suggest that the number of objects with masses below about 15 M$_{Jup}$ must be flat or declining relative to higher mass objects. The masses of the coldest Y dwarfs may be similar to those inferred for recently imaged planet-mass companions to nearby young stars. Objects in this mass range, which appear to be rare in both the interstellar and proto-planetary environments, may both have formed via gravitational fragmentation: the brown dwarfs in interstellar clouds and companion objects in a protoplanetary disk. In both cases, however, the fact that objects in this mass range are relatively infrequent, suggests that this mechanism must be inefficient in both environments.
description: Accepted for publication in the Astrophysical Journal
Integrating theory and experiments to link local mechanisms and ecosystem-level consequences of vegetation patterns in drylands
Creators: name: Martinez-Garcia, Ricardo
name: Cabal, Ciro
name: Calabrese, Justin M.
name: Hernández-García, Emilio
name: Tarnita, Corina E.
name: López, Cristóbal
name: Bonachela, Juan A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Self-organized spatial patterns of vegetation are frequent in drylands and, because pattern shape correlates with water availability, they have been suggested as important indicators of ecosystem health. However, the mechanisms underlying pattern emergence remain unclear. Some theories hypothesize that patterns could result from a water-mediated scale-dependent feedback (SDF) whereby interactions favoring plant growth dominate at short distances and growth-inhibitory interactions dominate in the long range. However, we know little about how the presence of a focal plant affects the fitness of its neighbors as a function of the inter-individual distance, which is expected to be highly ecosystem-dependent. This lack of empirical knowledge and system dependency challenge the relevance of SDF as a unifying theory for vegetation pattern formation. Assuming that plant interactions are always inhibitory and only their intensity is scale-dependent, alternative theories also recover the typical vegetation patterns observed in nature. Importantly, although these alternative hypotheses lead to visually indistinguishable patterns, they predict contrasting desertification dynamics, which questions the potential use of vegetation patterns as ecosystem-state indicators. To help resolve this issue, we first review existing theories for vegetation self-organization and their conflicting predictions about desertification dynamics. Second, we discuss potential empirical tests via manipulative experiments to identify pattern-forming mechanisms and link them to specific desertification dynamics. A comprehensive view of models, the mechanisms they intend to capture, and experiments to test them in the field will help to better understand both how patterns emerge and improve predictions on the fate of the ecosystems where they form.
description: 20 pages, 6 figures
Boundary Effects in Quantum Physics
Creators: name: Asorey, M.
name: Munoz-Castaneda, J. M
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze the role of boundaries in the infrared behavior of quantum field theories. By means of a novel method we calculate the vacuum energy for a massless scalar field confined between two homogeneous parallel plates with the most general type of boundary properties. This allows the discrimination between boundary conditions which generate attractive or repulsive Casimir forces between the plates. In the interface between both regimes we find a very interesting family of boundary conditions which do not induce any type of Casimir force. We analyze the effect of the renormalization group flow on these boundary conditions. Even if the Casimirless conformal invariant conditions are physically unstable under renormalization group flow they emerge as a new set of conformally invariant boundary conditions which are anomaly free.
description: 7 pages, 5 figures, Proceedings of the Workshop on Folding and Unfolding: Interactions from Geometry, Ischia, Italy (2011)
ปัจจัยที่มีความสัมพันธ์กับทักษะการเรียนรู้ศตวรรษที่ 21 ของผู้เข้าอบรมหลักสูตรการพยาบาลเฉพาะทาง สาขาการพยาบาลเวชปฏิบัติครอบครัว
Creators: name: ทัตภณ พละไชย
Publisher: name: ศูนย์อนามัยที่ 9 นครราชสีมา
Year: 2563
Subjects: ทักษะการเรียนรู้ศตวรรษที่ 21
ผู้เข้าอบรม
หลักสูตรการพยาบาลเวชปฏิบัติครอบครัว

description: วารสารศูนย์อนามัยที่ 9, 14, 35, 495-507
Model-Based Policy Search Using Monte Carlo Gradient Estimation with Real Systems Application
Creators: name: Amadio, Fabio
name: Libera, Alberto Dalla
name: Antonello, Riccardo
name: Nikovski, Daniel
name: Carli, Ruggero
name: Romeres, Diego
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: In this paper, we present a Model-Based Reinforcement Learning (MBRL) algorithm named \emph{Monte Carlo Probabilistic Inference for Learning COntrol} (MC-PILCO). The algorithm relies on Gaussian Processes (GPs) to model the system dynamics and on a Monte Carlo approach to estimate the policy gradient. This defines a framework in which we ablate the choice of the following components: (i) the selection of the cost function, (ii) the optimization of policies using dropout, (iii) an improved data efficiency through the use of structured kernels in the GP models. The combination of the aforementioned aspects affects dramatically the performance of MC-PILCO. Numerical comparisons in a simulated cart-pole environment show that MC-PILCO exhibits better data efficiency and control performance w.r.t. state-of-the-art GP-based MBRL algorithms. Finally, we apply MC-PILCO to real systems, considering in particular systems with partially measurable states. We discuss the importance of modeling both the measurement system and the state estimators during policy optimization. The effectiveness of the proposed solutions has been tested in simulation and on two real systems, a Furuta pendulum and a ball-and-plate rig.
description: Accepted in IEEE Transactions on Robotics. MC-PILCO code is publicly available at https://www.merl.com/research/license/MC-PILCO
Ein paar Gedanken über die Befreiung von Lesben und Schwulen
Creators: name: Wagner, Thomas
Publisher: name: Werkstatt Schwule Theologie
Year: 1970

description: Werkstatt Schwule Theologie, Bd. 1 Nr. 1 (1994): Werkstatt Schwule Theologie, Band 1, Heft 1
title: Barrikade an der Wedelgasse den 18. Septembr.; [1848]
title: Sie berathen und wir handhaben die Grundrechte
titleType: Subtitle
Creators: name: Elliot, Ludwig von
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Vorlageform der Veröffentlichungsangabe: Gedruckt bei C. Knatz in Frankfurt a/m.
Thermal DBI action for the D3-brane at weak and strong coupling
Creators: name: Grignani, Gianluca
name: Harmark, Troels
name: Marini, Andrea
name: Orselli, Marta
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the effective action for finite-temperature D3-branes with an electromagnetic field at weak and strong coupling. We call this action the thermal DBI action. Comparing at low temperature the leading $T^4$ correction for the thermal DBI action at weak and strong coupling we find that the $3/4$ factor well-known from the AdS/CFT correspondence extends to the case of arbitrary electric and magnetic fields on the D3-brane. We investigate the reason for this by taking the decoupling limit in both the open and the closed string descriptions thus showing that the AdS/CFT correspondence extends to the case of arbitrary constant electric and magnetic fields on the D3-brane.
description: 30 pages, no figures
Dynamics of Associative Polymers with High Density of Reversible Bonds
Creators: name: Nian, Shifeng
name: Patil, Shalin
name: Zhang, Siteng
name: Kim, Myoeum
name: Chen, Quan
name: Zhernenkov, Mikhail
name: Ge, Ting
name: Cheng, Shiwang
name: Cai, Li-Heng
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: Chemical Physics (physics.chem-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We design and synthesize unentangled associative polymers carrying unprecedented high fractions of stickers, up to eight per Kuhn segment, that can form strong pairwise hydrogen bonding of $\sim20k_BT$ without microphase separation. The reversible bonds significantly slow down the polymer dynamics but nearly do not change the shape of linear viscoelastic spectra. Moreover, the structural relaxation time of associative polymers increases exponentially with the fraction of stickers and exhibits a universal yet non-Arrhenius dependence on the distance from polymer glass transition temperature. These results cannot be understood within the framework of the classic sticky-Rouse model but are rationalized by a renormalized Rouse model, which highlights an unexpected influence of reversible bonds on the structural relaxation rather than the shape of viscoelastic spectra for associative polymers with high concentrations of stickers.
description: 4 figures
Connection between response parameter and anomaly coefficient in two dimensional anomalous fluid
Creators: name: Majhi, Bibhas Ranjan
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In (1+1) dimensional hydrodynamics in presence of the gravitational anomalies, the constitutive relations for the stress tensor contain the response parameters $\bar{C}_1$, $\bar{C}_2$ and the gravitation anomaly coefficients $c_g$, $c_w$. Here it is shown that they are related by the two relations $\bar{C}_1 = 4π^2 c_w$ and $\bar{C}_2 = 8π^2 c_g$. This agrees with the earlier findings. I argue that the Israel-Hartle-Hawking vacuum is the natural boundary condition which leads to such relation. Finally, the possible physical implications are discussed.
description: Revised version, to appear in JHEP
An updated analysis of radion-higgs mixing in the light of LHC data
Creators: name: Desai, Nishita
name: Maitra, Ushoshi
name: Mukhopadhyaya, Biswarup
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We explore the constraints on the parameter space of a Randall-Sundrum warped geometry scenario, where a radion field arises out of the attempt to stabilise the radius of the extra compact spacelike dimension, using the most recent data from higgs searches at the Large Hadron Collider (LHC) and the Tevatron. We calculate contributions from both the scalar mass eigenstates arising from radion-higgs kinetic mixing in all important search channels. The most important channel to be affected is the decay via WW*, where no invariant mass peak can discern the two distinct physical states. Improving upon the previous studies, we perform a full analysis in the WW* channel, taking into account the effect of various cuts and interference when the two scalar are closely spaced. We examine both cases where the experimentally discovered scalar is either 'higgs-like' or 'radion-like'. The implications of a relatively massive scalar decaying into a pair of 125 GeV scalars is also included. Based on a global analysis of the current data, including not only a single 125 GeV scalar but also another one with mass over the range 110 to 600 GeV, we obtain the up-to-date exclusion contours in the parameter space. Side by side, regions agreeing with the data within 68% and 95% confidence level based on a χ^2-minimisation procedure, are also presented.
“Fishing fouling and hunting bee free:” How English Hunting was changed in New England
Creators: name: Clewley, Samuel R.
Publisher: name: University of Chicago
Year: 2023

description: Social and political structures organizing hunting in England were altered significantly as English settlers made their way to New England in the seventeenth century. Prior research either focuses on English hunting in England or on the specific ways English modes of settlement disrupted the wildlife, Ingenious population, and environment. As a result, current research does not fully account for how hunting conditions in England influenced how settlers hunted in New England, nor the subsequent changes to New England’s environment. I utilize sources from both England and New England to provide an Atlantic account of English hunting in New England. I find that while English settlers often turned to the kind of hunting they knew, they also understood New England as a place to reject old ways of hunting. Because hunting was a closed, elite activity in England, and out of necessity, English settlers made hunting more possible in New England. In doing so, the settlers also changed the course of New England’s environment, wildlife, and the Indigenous population.
Learning curves of generic features maps for realistic datasets with a teacher-student model
Creators: name: Loureiro, Bruno
name: Gerbelot, Cédric
name: Cui, Hugo
name: Goldt, Sebastian
name: Krzakala, Florent
name: Mézard, Marc
name: Zdeborová, Lenka
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Machine Learning (cs.LG)
subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Teacher-student models provide a framework in which the typical-case performance of high-dimensional supervised learning can be described in closed form. The assumptions of Gaussian i.i.d. input data underlying the canonical teacher-student model may, however, be perceived as too restrictive to capture the behaviour of realistic data sets. In this paper, we introduce a Gaussian covariate generalisation of the model where the teacher and student can act on different spaces, generated with fixed, but generic feature maps. While still solvable in a closed form, this generalization is able to capture the learning curves for a broad range of realistic data sets, thus redeeming the potential of the teacher-student framework. Our contribution is then two-fold: First, we prove a rigorous formula for the asymptotic training loss and generalisation error. Second, we present a number of situations where the learning curve of the model captures the one of a realistic data set learned with kernel regression and classification, with out-of-the-box feature maps such as random projections or scattering transforms, or with pre-learned ones - such as the features learned by training multi-layer neural networks. We discuss both the power and the limitations of the framework.
description: v3: NeurIPS camera-ready
LIMFAST. I. A Semi-Numerical Tool for Line Intensity Mapping
Creators: name: Mas-Ribas, Lluís
name: Sun, Guochao
name: Chang, Tzu-Ching
name: Gonzalez, Michael O.
name: Mebane, Richard H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present LIMFAST, a semi-numerical code for simulating high-redshift galaxy formation and cosmic reionization as revealed by multi-tracer line intensity mapping (LIM) signals. LIMFAST builds upon and extends the 21cmFAST code widely used for 21 cm cosmology by implementing state-of-the-art models of galaxy formation and evolution. The metagalactic radiation background, including the production of various star-formation lines, together with the 21 cm line signal tracing the neutral intergalactic medium (IGM), are self-consistently described by photoionization modeling and stellar population synthesis coupled to the galaxy formation model. We introduce basic structure and functionalities of the code, and demonstrate its validity and capabilities by showing broad agreements between the predicted and observed evolution of cosmic star formation, IGM neutral fraction, and metal enrichment. We also present the LIM signals of 21 cm, Ly$α$, H$α$, H$β$, [OII], and [OIII] lines simulated by LIMFAST, and compare them with results from the literature. We elaborate on how several major aspects of our modeling framework, including models of star formation, chemical enrichment, and photoionization, may impact different LIM observables and thus become testable once applied to observational data. LIMFAST aims at being an efficient and resourceful tool for intensity mapping studies in general, exploring a wide range of scenarios of galaxy evolution and reionization and frequencies over which useful cosmological signals can be measured.
description: 24 pages, 12 figures; to appear in ApJ after being significantly updated from v1
Design Guidance for Robust Design using Load-strength and Design of Experiments
Creators: name: Loll, Valter
Publisher: name: Technical University of Denmark, DTU : International Symposium on Robust Design
Year: 2014

description: The short product development cycle and the increased demand of robust, safe and reliable design has made the Test Analysis And Fix (TAAF) method obsolete. Closing the feedback loop on a design from field return (FRACAS) takes years. Closing the feedback loop from testing take months. Therefore a modern design has to build in robustness, safety and reliability during the design process. The paper describes how the Load-Strength theory and other methods can be used to develop design guidance for a robust design. The influence of safety margin and loading roughness is described together with repeated loads. Real examples of design guidance for robustness are shown.
LIMFAST. II. Line Intensity Mapping as a Probe of High-Redshift Galaxy Formation
Creators: name: Sun, Guochao
name: Mas-Ribas, Lluís
name: Chang, Tzu-Ching
name: Furlanetto, Steven R.
name: Mebane, Richard H.
name: Gonzalez, Michael O.
name: Parsons, Jasmine
name: Trapp, A. C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The epoch of reionization (EoR) offers a unique window into the dawn of galaxy formation, through which high-redshift galaxies can be studied by observations of both themselves and their impact on the intergalactic medium. Line intensity mapping (LIM) promises to explore cosmic reionization and its driving sources by measuring intensity fluctuations of emission lines tracing the cosmic gas in varying phases. Using LIMFAST, a novel semi-numerical tool designed to self-consistently simulate LIM signals of multiple EoR probes, we investigate how building blocks of galaxy formation and evolution theory, such as feedback-regulated star formation and chemical enrichment, might be studied with multi-tracer LIM during the EoR. On galaxy scales, we show that the star formation law and the feedback associated with star formation can be indicated by both the shape and redshift evolution of LIM power spectra. For a baseline model of metal production that traces star formation, we find that lines highly sensitive to metallicity are generally better probes of galaxy formation models. On larger scales, we demonstrate that inferring ionized bubble sizes from cross-correlations between tracers of ionized and neutral gas requires a detailed understanding of the astrophysics that shape the line luminosity--halo mass relation. Despite various modeling and observational challenges, wide-area, multi-tracer LIM surveys will provide important high-redshift tests for the fundamentals of galaxy formation theory, especially the interplay between star formation and feedback by accessing statistically the entire low-mass population of galaxies as ideal laboratories, complementary to upcoming surveys of individual sources by new-generation telescopes.
description: 24 pages, 15 figures; to appear in ApJ
Trialities of orthosymplectic $\mathcal{W}$-algebras
Creators: name: Creutzig, Thomas
name: Linshaw, Andrew R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Representation Theory (math.RT)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Trialities of $\mathcal{W}$-algebras are isomorphisms between the affine cosets of three different $\mathcal{W}$-(super)algebras, and were first conjectured in the physics literature by Gaiotto and Rapčák. In this paper we prove trialities among eight families of $\mathcal{W}$-(super)algebras of types $B$, $C$, and $D$. The key idea is to identify the affine cosets of these algebras with one-parameter quotients of the universal two-parameter even spin $\mathcal{W}_{\infty}$-algebra which was recently constructed by Kanade and the second author. Our result is a vast generalization of both Feigin-Frenkel duality in types $B$, $C$, and $D$, and the coset realization of principal $\mathcal{W}$-algebras of type $D$ due to Arakawa and us. It also provides a new coset realization of principal $\mathcal{W}$-algebras of types $B$ and $C$. As an application, we prove the rationality of the affine vertex superalgebra $L_k(\mathfrak{osp}_{1|2n})$, the minimal $\mathcal{W}$-algebra $\mathcal{W}_{k-1/2}(\mathfrak{sp}_{2n+2}, f_{\text{min}})$, and the coset $\text{Com}(L_k(\mathfrak{sp}_{2m}), L_k(\mathfrak{sp}_{2n}))$, for all integers $k,n,m \geq 1$ with $m
description: Some corrections and expository improvements, references added, final version to appear in Advances in Mathematics
In India’s Sea of Darkness: An Unsustainable Island of Decentralized Energy Production
Creators: name: Singh, Kartikeya
Publisher: name: Columbia University
Year: 2009
Subjects: Electric power distribution
Rural development
Renewable energy sources
Rural poor
Distributed generation of electric power
Solar energy
Sustainability
Power resources

description: Approximately 500 million people in India’s countryside are still without access to electricity. The government has launched an ambitious project to electrify the entire nation by 2012. Unfortunately, the term “village electrification” defines electricity distribution for only 10% of households. An equally ambitious plan by the Ministry of New and Renewable Energy aims to to electrify about 25,000 of the remotest villages in India. In these villages, it is inefficient to extend an energy grid rather than develop decentralized, renewable energy systems. The economic development of a large portion of India’s population depends on the success of decentralized energy distribution. This development will help provide the means to eradicate poverty. Ensuring the success of these systems requires a closer look at the rural energy ladder. One must go beyond just lighting in order to establish a paradigm for integrated sustainable energy independence for India’s rural villages. Whether India decides to power its villages through grid-fed coal power or through decentralized renewable energy systems, this decision has major implications for global climate change. This study assesses the benefits and drawbacks of one such distributive power system: solar home lighting.
Deep high spectral resolution spectroscopy and chemical composition of ionized nebulae
Creators: name: Esteban, C.
name: Garcia-Rojas, J.
name: Mesa-Delgado, A.
name: Cipriano, L. Toribio San
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: High spectral resolution spectroscopy has proved to be very useful for the advancement of chemical abundances studies in photoionized nebulae, such as H II regions and planetary nebulae (PNe). Classical analyses make use of the intensity of bright collisionally excited lines (CELs), which have a strong dependence on the electron temperature and density. By using high resolution spectrophotometric data, our group has led the determination of chemical abundances of some heavy element ions, mainly O++, O+ and C++ from faint recombination lines (RLs), allowing us to deblend them from other nearby emission lines or sky features. The importance of these lines is that their emissivity depends weakly on the temperature and density structure of the gas. The unresolved issue in this field is that recombination lines of heavy element ions give abundances that are about 2-3 times higher than those derived from CELs -in H II regions- for the same ion, and can even be a factor of 70 times higher in some PNe. This uncertainty puts into doubt the validity of face values of metallicity that we use as representative not only for ionized nebulae in the Local Universe, but also for star-forming dwarf and spiral galaxies at different redshifts. Additionally, high-resolution data can allow us to detect and deblend faint lines of neutron capture element ions in PNe. This information would introduce further restrictions to evolution models of AGBs and would help to quantify the chemical enrichment in s-elements produced by low and intermediate mass stars. The availability of an echelle spectrograph at the E-ELT will be of paramount interest to: (a) extend the studies of heavy element recombination lines to low metallicity objects, (b) to extend abundance determinations of s-elements to planetary nebulae in the extragalactic domain and to bright Galactic and extragalactic H II regions.
description: 6 pages, 6 figures, Accepted for publication in Astronomische Nachrichten