cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
GRB 080517: A local, low luminosity GRB in a dusty galaxy at z=0.09
Creators: name: Stanway, E. R.
name: Levan, A. J.
name: Tanvir, N. R.
name: Wiersema, K.
name: van der Horst, A.
name: Mundell, C. G.
name: Guidorzi, C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present an analysis of the photometry and spectroscopy of the host galaxy of Swift-detected GRB 080517. From our optical spectroscopy, we identify a redshift of z = 0.089 +/- 0.003, based on strong emission lines, making this a rare example of a very local, low luminosity, long gamma ray burst. The galaxy is detected in the radio with a flux density of S(4.8GHz) =0.22 +/- 0.04mJy - one of relatively few known GRB hosts with a securely measured radio flux. Both optical emission lines and a strong detection at 22 um suggest that the host galaxy is forming stars rapidly, with an inferred star formation rate ~16 Msun/yr and a high dust obscuration (E(B-V )>1, based on sight-lines to the nebular emission regions). The presence of a companion galaxy within a projected distance of 25 kpc, and almost identical in redshift, suggests that star formation may have been triggered by galaxy-galaxy interaction. However, fitting of the remarkably flat spectral energy distribution from the ultraviolet through to the infrared suggests that an older, 500Myr post-starburst stellar population is present along with the ongoing star formation. We suggest that that the host galaxy of GRB 080517 is a valuable addition to the still very small sample of well-studied local gamma-ray burst hosts.
description: 17 pages, minor edits to match accepted version
title: Χρήση τεχνικών μηχανικής μάθησης για την ανάλυση ιατρικών εικόνων με στόχο την υποβοήθηση στη διάγνωση της λοίμωξης COVID-19
title: Use of machine learning techniques to analyze medical images with the aim of assisting in the diagnosis of COVID-19 infection
titleType: AlternativeTitle
Creators: name: Ψαραύτης-Σουράνης, Συμεών
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Όραση Υπολογιστών
Μηχανική μάθηση
Βαθιά μάθηση
Μεταφορά μάθησης
Συνελικτικά νευρωνικά δίκτυα
Covid-19
Ταξινόμηση εικόνων
Σημασιολογική κατάτμηση εικόνων
Ιατρική απεικόνιση
Αξονική τομογραφία

description: Η ραγδαία εξέλιξη της τεχνολογίας έχει ως αποτέλεσμα το επιστημονικό πεδίο που ονομάζεται επιστήμη των υπολογιστών να βρίσκει εφαρμογές σε ολοένα και περισσότερους τομείς. Ένας από αυτούς τους τομείς αποτελεί και η επιστήμη της ιατρικής. Η πρόοδος που έχει σημειωθεί στην επιστήμη των υπολογιστών, ιδιαίτερα στο υποπεδίο που ονομάζεται μηχανική μάθηση, καθιστά δυνατή την υποστήριξη μιας πληθώρας ιατρικών καθηκόντων μέσω τεχνικών της. Παραδείγματος χάρη, οι τεχνικές μηχανικής μάθησης μπορούν να αξιοποιηθούν για την ανίχνευση πιθανής παρουσίας κάποιας ασθένειας ή όγκου σε ιατρικές εικόνες, όπως ακτινογραφίες (X-rays), αξονικές τομογραφίες (CT scans) και μαγνητικές τομογραφίες (MRI scans). Λαμβάνοντας υπόψη τη δύσκολη περίοδο την οποία διανύουμε εξαιτίας της πανδημίας COVID-19, καθώς και τη σημασία της ακρίβειας στην ανίχνευση της νόσου, μπορούμε ξεκάθαρα να διαπιστώσουμε ότι η βοήθεια που μπορεί να προσφέρει η μηχανική μάθηση στην ιατρική επιστήμη, είναι πιο πολύτιμη από ποτέ. Στην παρούσα διπλωματική εργασία, πραγματευόμαστε την ανάλυση ιατρικών εικόνων για την υποβοήθηση στη διάγνωση COVID-19 κάνοντας χρήση τεχνικών μηχανικής μάθησης. Πιο συγκεκριμένα, εξετάζουμε την αποτελεσματικότητα τεχνικών βαθιάς μάθησης, και ειδικότερα συνελικτικών νευρωνικών δικτύων, στην ανίχνευση της νόσου COVID-19, βασιζόμενοι σε πραγματικά δεδομένα ιατρικών εικόνων που έχουν συλλεχθεί παγκοσμίως.
Hysteretic transitions in the Kuramoto model with inertia
Creators: name: Olmi, Simona
name: Navas, Adrian
name: Boccaletti, Stefano
name: Torcini, Alessandro
Publisher: name: arXiv
Year: 2014
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We report finite size numerical investigations and mean field analysis of a Kuramoto model with inertia for fully coupled and diluted systems. In particular, we examine for a Gaussian distribution of the frequencies the transition from incoherence to coherence for increasingly large system size and inertia. For sufficiently large inertia the transition is hysteretic and within the hysteretic region clusters of locked oscillators of various sizes and different levels of synchronization coexist. A modification of the mean field theory developed by Tanaka, Lichtenberg, and Oishi [Physica D, 100 (1997) 279] allows to derive the synchronization profile associated to each of these clusters. We have also investigated numerically the limits of existence of the coherent and of the incoherent solutions. The minimal coupling required to observe the coherent state is largely independent of the system size and it saturates to a constant value already for moderately large inertia values. The incoherent state is observable up to a critical coupling whose value saturates for large inertia and for finite system sizes, while in the thermodinamic limit this critical value diverges proportionally to the mass. By increasing the inertia the transition becomes more complex, and the synchronization occurs via the emergence of clusters of whirling oscillators. The presence of these groups of coherently drifting oscillators induces oscillations in the order parameter. We have shown that the transition remains hysteretic even for randomly diluted networks up to a level of connectivity corresponding to few links per oscillator. Finally, an application to the Italian high-voltage power grid is reported, which reveals the emergence of quasi-periodic oscillations in the order parameter due to the simultaneous presence of many competing whirling clusters.
description: 34 pages, 18 figures, submitted to Physical Review E
Classical and quantum effective theories
Creators: name: Polonyi, Janos
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A generalization of the action principle of classical mechanics, motivated by the Closed Time Path (CTP) scheme of quantum field theory, is presented to deal with initial condition problems and dissipative forces. The similarities of the classical and the quantum cases are underlined. In particular, effective interactions which describe classical dissipative forces represent the system-environment entanglement. The relation between the traditional effective theories and their CTP extension is briefly discussed and few qualitative examples are mentioned.
description: 38 pages, 3 figures, last paragraph added, typos fixed, to appear in Phys. Rev. D
Stellar parameters and chemical abundances of 223 evolved stars with and without planets
Creators: name: Jofré, E.
name: Petrucci, R.
name: Saffe, C.
name: Saker, L.
name: de la Villarmois, E. Artur
name: Chavero, C.
name: Gómez, M.
name: Mauas, P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present fundamental stellar parameters and chemical abundances for a sample of 86 evolved stars with planets and for a control sample of 137 stars without planets. The analysis was based on both high S/N and resolution echelle spectra. The goals of this work are i) to investigate chemical differences between stars with and without planets; ii) to explore potential differences between the properties of the planets around giants and subgiants; and iii) to search for possible correlations between these properties and the chemical abundances of their host stars. In agreement with previous studies, we find that subgiants with planets are, on average, more metal-rich than subgiants without planets by ~ 0.16 dex. The [Fe/H] distribution of giants with planets is centered at slightly subsolar metallicities and there is no metallicity enhancement relative to the [Fe/H] distribution of giants without planets. Furthermore, contrary to recent results, we do not find any clear difference between the metallicity distributions of stars with and without planets for giants with M > 1.5 Msun. With regard to the other chemical elements, the analysis of the [X/Fe] distributions shows differences between giants with and without planets for some elements, particularly V, Co, and Ba. Analyzing the planet properties, some interesting trends might be emerging: i) multi-planet systems around evolved stars show a slight metallicity enhancement compared with single-planet systems; ii) planets with a $\lesssim$ 0.5 AU orbit subgiants with [Fe/H] > 0 and giants hosting planets with a $\lesssim$ 1 AU have [Fe/H] < 0; iii) higher-mass planets tend to orbit more metal-poor giants with M < 1.5 Msun, whereas planets around subgiants seem to follow the planet-mass metallicity trend observed on dwarf hosts; iv) planets orbiting giants show lower orbital eccentricities than those orbiting subgiants and dwarfs.
description: 49 pages, 31 figures, Accepted for publication in A&A, abstract shortened - corrected references, typos, acknowledgements included
Orbital momentum of chiral superfluids and spectral asymmetry of edge states
Creators: name: Volovik, G. E.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This is comment to preprint arXiv:1409.7459 by Y. Tada, Wenxing Nie and M. Oshikawa "Orbital angular momentum and spectral flow in two dimensional chiral superfluids", where the effect of spectral flow along the edge states on the magnitude of the orbital angular momentum is discussed. The general conclusion of the preprint on the essential reduction of the angular momentum for the higher values of chirality, $|ν|>1$, is confirmed. However, we show that if parity is violated, the reduction of the angular momentum takes place also for the $p$-wave superfluids with $|ν|=1$.
description: 4 pages, 2 figures, version accepted in JETP Letters
Vaccination in Poultry
Creators: name: Paras Saini*1, Rakshita Sharma2, Arushi Kanwar3
Publisher: name: The Science World a monthly e magazine
Year: 2024

description: Livestock and poultry farming face significant threats from diseases impacting economic development, food security, and trade. Protecting these animals and birds, particularly in countries like India, is crucial for combating hunger, malnutrition, and poverty. Focusing on chickens, vaccination emerges as a pivotal factor in maintaining productive health. Vaccines, categorized as live, killed, or recombinant, play a vital role in preventing a range of diseases, contributing to individual and herd immunity.
title: Μελέτη και τεχνολογίες ανάπτυξης συστήματος έξυπνων φαναριών
title: Smart traffic light system development study and technologies
titleType: AlternativeTitle
Creators: name: Νιάφας, Άγγελος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Υπολογιστική νέφους
Διαδίκτυο των αντικειμένων
Εικονικοποίηση
Containers
Microservices
Docker swarm
Kybernetes
Os-level virtualization

description: Αντικείμενο της διπλωματικής εργασίας θα αποτελέσει η μελέτη, σχεδιασμός και ανάπτυξη συστήματος έξυπνων φαναριών (smart traffic lights system) με χρήση τεχνικών εικονικοποίησης βασισμένης σε περιέκτες (container-based virtualization) και αρχιτεκτονικής μικροϋπηρεσιών (microservices architecture).
Nanomechanical and topographical imaging of living cells by Atomic Force Microscopy with colloidal probes
Creators: name: Puricelli, Luca
name: Galluzzi, Massimiliano
name: Schulte, Carsten
name: Podestà, Alessandro
name: Milani, Paolo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Cell Behavior (q-bio.CB)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Atomic Force Microscopy (AFM) has a great potential as a tool to characterize mechanical and morphological properties of living cells; these properties have been shown to correlate with cells' fate and patho-physiological state in view of the development of novel early-diagnostic strategies. Although several reports have described experimental and technical approaches for the characterization of cell elasticity by means of AFM, a robust and commonly accepted methodology is still lacking. Here we show that micrometric spherical probes (also known as colloidal probes) are well suited for performing a combined topographic and mechanical analysis of living cells, with spatial resolution suitable for a complete and accurate mapping of cell morphological and elastic properties, and superior reliability and accuracy in the mechanical measurements with respect to conventional and widely used sharp AFM tips. We address a number of issues concerning the nanomechanical analysis, including the applicability of contact mechanical models and the impact of a constrained contact geometry on the measured elastic modulus (the finite-thickness effect). We have tested our protocol by imaging living PC12 and MDA-MB-231 cells, in order to demonstrate the importance of the correction of the finite-thickness effect and the change in cell elasticity induced by the action of a cytoskeleton-targeting drug.
description: 51 pages, 12 figures, 3 tables
Inhomogeneous distribution of droplets in cloud turbulence
Creators: name: Fouxon, Itzhak
name: Park, Yongnam
name: Harduf, Roei
name: Lee, Changhoon
Publisher: name: arXiv
Year: 2014
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We solve the problem of spatial distribution of inertial particles that sediment in turbulent flow with small ratio of acceleration of fluid particles to acceleration of gravity $g$. The particles are driven by linear drag and have arbitrary inertia. The pair-correlation function of concentration obeys a power-law in distance with negative exponent. Divergence at zero signifies singular distribution of particles in space. Independently of particle size the exponent is ratio of integral of energy spectrum of turbulence times the wavenumber to $g$ times numerical factor. We find Lyapunov exponents and confirm predictions by direct numerical simulations of Navier-Stokes turbulence. The predictions include typical case of water droplets in clouds. This significant progress in the study of turbulent transport is possible because strong gravity makes the particle's velocity at a given point unique.
description: 6 pages, 2 figures. arXiv admin note: substantial text overlap with arXiv:1409.5856, text revisions
Impact of shading on evapotranspiration and water stress of urban trees
Creators: name: Tams, Laura
name: Paton, Eva Nora
name: Kluge, Björn
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::551 Geologie, Hydrologie, Meteorologie
subject: diffuse radiation
subject: direct radiation
subject: evapotranspiration
subject: global radiation
subject: shading
subject: urban environment
subject: urban trees
subject: water stress
subject: ET

description: Evapotranspiration of urban street trees is essential in mitigating urban heat islands due to its cooling effect. However, current shifts in rainfall and temperature regimes towards drier and hotter periods in Central Europe have caused substantial water stress for street trees. Quantifying and subsequently managing these changing dynamics as well as estimating evapotranspiration and water availability is necessary but at the same time extremely challenging in urban environments. Both dynamics are influenced by soil sealing and complex shading patterns of the surrounding street canyon, which vary on a small spatial scale as a function of the canyon layout and orientation. In the present study, the diurnal patterns of six typical urban shading types for street trees were derived by considering a large set of street orientations, widths and tree positions within the street canyon. A shading model was integrated into a hydrological urban tree model to assess the impact of those shading types on diurnal patterns of radiation and evapotranspiration rates calculated using the Penman–Monteith approach and the resulting soil moisture conditions for several vegetation seasons and water-supply scenarios. The modelling results showed that the six shading patterns significantly influenced the simulated hourly, daily and seasonal potential and actual evapotranspiration rates and water availability. Shaded trees have a substantially reduced, simulated water stress period, regardless of initial water supply, and are able to provide a longer-lasting cooling function during dry periods due to higher evapotranspiration rates later in the summer season.
Washington Post-University of Maryland Coronavirus Poll: Week 4
Creators: name: Democracy, Center For
name: Washington Post
Publisher: name: Roper Center for Public Opinion Research
Year: 2020

description: Rating response to coronavirus (COVID-19) outbreak (2); worry about becoming infected with coronavirus (1); restrictions on business operations during outbreak (1); necessary for people in local community to follow various recommended guidelines during outbreak (4); people in local community taking social distancing too seriously/not seriously enough (1); when coronavirus will be under control enough for safe gatherings of 10 or more people (1).
Fatigue strength of the joint of steel cantilevers in composite bridges
Creators: name: Erlemann, Raphael
name: Kraus, Josef Karl
name: Geissler, Karsten
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 600 Technik, Medizin, angewandte Wissenschaften::620 Ingenieurwissenschaften::620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
subject: fatigue strength
subject: composite steel bridges
subject: cantilever
subject: fatigue tests
subject: detail category
subject: welded joints

description: Box girders with steel cantilevers underneath the deck are frequently used in the design of composite steel bridges. Hereby, the welded joints between the main girder and the transverse system have to endure fatigue loads. Current design specifications for this joint, e.g., a tapering in thickness of the top flanges at the same position of a transition radius, are complex to manufacture and provide a higher fatigue resistance than necessary. This article addresses the optimization of this structural detail, which is realized hundreds of times per structure. Several laboratory tests and numerical simulations were carried out regarding the load‐bearing behavior and the fatigue safety of the cantilevers as double‐T‐sections and as box girders. Additionally, 60 fatigue tests were conducted on small‐scale specimen to classify the resulting simplified design variants in detail categories of the nominal stress concept. As a result, two design recommendations are proposed for the joint at the intersecting top flanges. Moreover, the effect of an unplanned axial misalignment on the fatigue strength of the joint at the bottom flange is quantified.
Experiment‐based statistical distribution of buckling loads of cylindrical shells
Creators: name: Li, Zheng
name: Pasternak, Hartmut
name: Geißler, Karsten
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 600 Technik, Medizin, angewandte Wissenschaften::620 Ingenieurwissenschaften::620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
subject: cylindrical shell
subject: buckling
subject: axial compression test
subject: geometric imperfection
subject: statistical distribution

description: A silo structure is usually constructed in the form of a cylindrical steel shell. It has the advantages of being lightweight, having a short construction period, and possessing a large storage space. It has been widely used in many fields of industry. Thin-walled cylindrical shells often exhibit buckling failure and the experimental buckling load is usually lower than calculation results from classical theory and simulation without geometrical imperfection. Besides, test results with carefully conducted similar specimens still have substantial scatter due to imperfection sensitivity. The nonlinear analysis with FEM can obtain a high-precision result comparing the experiment if the geometric parameters of the shell are fully known. However, this is almost impossible in practical engineering. The initial geometric imperfections and shell thickness of cylindrical shells are complex and random properties. Theoretically, these geometric imperfections can be described using a random field. This paper presents the experimental investigation of buckling analysis of cylindrical shells under axial compression considering the randomness of geometric imperfections and thickness. A total of 12 cylindrical shell specimens were fabricated and tested. Based on the test results, the optimal statistical distribution is obtained by the maximum entropy fitting method and the obtained results were compared with geometric imperfections based on laser scan measurements.
ARAP Revisited Discretizing the Elastic Energy using Intrinsic Voronoi Cells
Creators: name: Finnendahl, Ugo
name: Schwartz, Matthias
name: Alexa, Marc
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 000 Informatik, Informationswissenschaft, allgemeine Werke::000 Informatik, Wissen, Systeme::004 Datenverarbeitung; Informatik
subject: modelling
subject: deformations
subject: polygonal modelling

description: As-rigid-as-possible (ARAP) surface modelling is widely used for interactive deformation of triangle meshes. We show that ARAP can be interpreted as minimizing a discretization of an elastic energy based on non-conforming elements defined over dual orthogonal cells of the mesh. Using the intrinsic Voronoi cells rather than an orthogonal dual of the extrinsic mesh guarantees that the energy is non-negative over each cell. We represent the intrinsic Delaunay edges extrinsically as polylines over the mesh, encoded in barycentric coordinates relative to the mesh vertices. This modification of the original ARAP energy, which we term iARAP, remedies problems stemming from non-Delaunay edges in the original approach. Unlike the spokes-and-rims version of the ARAP approach it is less susceptible to the triangulation of the surface. We provide examples of deformations generated with iARAP and contrast them with other versions of ARAP. We also discuss the properties of the Laplace-Beltrami operator implicitly introduced with the new discretization.
Non-linear spin transport in a rectifying ferromagnet/semiconductor Schottky contact
Creators: name: Jansen, R.
name: Spiesser, A.
name: Saito, H.
name: Yuasa, S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The electrical creation and detection of spin accumulation in ferromagnet/semiconductor Schottky contacts that exhibit highly non-linear and rectifying electrical transport is evaluated. If the spin accumulation in the semiconductor is small, the expression for the spin voltage is identical to that of linear transport. However, if the spin accumulation is comparable to the characteristic energy scale that governs the degree of non-linearity, the spin detection sensitivity and the spin voltage are notably reduced. Moreover, the non-linearity enhances the back-flow of spins into the ferromagnet and its detrimental effect on the injected spin current, and the contact resistance required to avoid back-flow is larger than for linear transport. It is also shown that by virtue of the non-linearity, a non-magnetic metal contact can be used to electrically detect spin accumulation in a semiconductor.
description: Added appendix with general considerations about changes of the spin-detection sensitivity due to non-linearity; updated reference 51 to the related experimental manuscript by Spiesser et al. Phys. Rev. B 90, 205213 (2014) [and ArXiv:1410.4277]
Creative cognition: A multidisciplinary and integrative framework of creative thinking
Creators: name: Pinkow, Felix
Publisher: name: Technische Universität Berlin
Year: 2022
Subjects: subject: 600 Technik, Medizin, angewandte Wissenschaften::650 Management, Öffentlichkeitsarbeit::650 Management und unterstützende Tätigkeiten
subject: cognitive processes
subject: conceptual framework
subject: creative cognition
subject: creativity
subject: divergent and convergent thinking
subject: idea generation
subject: literature review

description: Extant research provides vast information on antecedents to creativity. However, creative thinking is oftentimes treated as a black box, requiring input and producing creative output. Cognitive processes occurring during creative thinking tend to be neglected, although they can provide a bridge between the inputs to creativity and the resulting outputs. Literature offers different perspectives on creative thinking processes, such as the separation of divergent and convergent thinking, different stages of creativity or the concept of creative cognition. This variety of concepts underlying creativity has led to confusion and misinterpretations of some concepts. Moreover, the overemphasis on creative outcomes and divergent thinking has resulted in a neglect of a more comprehensive view on cognitive dimensions of creativity. Through reviewing and synthesizing multidisciplinary literature on creativity, an integrative framework is developed positioning cognitive elements of creativity within a system including organizational antecedents to creativity and creative outcomes. The framework seeks to offer pathways to increasingly incorporate the concept of creative cognition into future research. Suggesting different forms of creative cognition that individuals engage in during creative thought, this theoretical work further offers a theoretical development of creativity concepts that intends to inspire future research designs and facilitates cross-disciplinary knowledge transfer.
Ανάκτηση Πληροφοριών στο Διαδίκτυο: Ευρετηρίαση για Ανάκτηση Πληροφοριών με το Terrier
Creators: name: Vasileiadis, Pavlos D.
Publisher: name: Zenodo
Year: 2020
Subjects: Pavlos Vasileiadis
Παύλος Βασιλειάδης
Information retrieval on the Internet
Ανάκτηση πληροφοριών στο Διαδίκτυο

description: English title: Information Retrieval on the Internet: Indexing for Information Retrieval using Terrier
Speeding up additive manufacturing by means of forming for sheet components with core structures
Creators: name: Rosenthal, Stephan
name: Hahn, Marlon
name: Tekkaya, A. Erman
name: Platt, Sebastian
name: Kleszczynski, Stefan
name: Witt, Gerd
Publisher: name: TU Dortmund
Year: 2021
Subjects: subject: Additive manufacturing
subject: Sheet forming
subject: Efficient manufacturing
subject: Hybrid process
subject: Laser-powderbed fusion
subject: 620
subject: 670
subject: Rapid Prototyping
subject: Blechumformen
subject: Gesenkbiegen
subject: Edelstahl
subject: Selektives Laserschmelzen

description: A new process combination route consisting of additive manufacturing (AM) with a subsequent forming operation is proposed. The process route has the opportunity to increase the efficiency of the AM process route up to 360%. Stainless steel 316L sheets with different core structures (similar to sandwich sheets) are produced by AM, characterized, and formed in a die bending operation. The bending characteristics of this novel semi-finished product can be accurately predicted in a numerical simulation. The new process route is discussed in detail and compared to conventional AM parts in terms of the production efficiency.
description: International journal of precision engineering and manufacturing;Vol. 9, 2022, Issue 4, pp 1021-1034
Advanced Characterization and Optimization of NiOx:Cu‐SAM Hole‐Transporting Bi‐Layer for 23.4% Efficient Monolithic Cu(In,Ga)Se2‐Perovskite Tandem Solar Cells
Creators: name: Kafedjiska, Ivona
name: Levine, Igal
name: Musiienko, Artem
name: Maticiuc, Natalia
name: Bertram, Tobias
name: Al‐Ashouri, Amran
name: Kaufmann, Christian A.
name: Albrecht, Steve
name: Schlatmann, Rutger
name: Lauermann, Iver
Publisher: name: Technische Universität Berlin
Year: 2023
Subjects: subject: 600 Technik, Medizin, angewandte Wissenschaften::620 Ingenieurwissenschaften::621 Angewandte Physik
subject: hole‐transporting layers
subject: monolithic CIGSe‐perovskite tandem solar cells
subject: NiO x
subject: photoemission spectroscopy
subject: photoluminesence
subject: self‐assembled monolayers
subject: surface photovoltage

description: The performance of five hole‐transporting layers (HTLs) is investigated in both single‐junction perovskite and Cu(In, Ga)Se2 (CIGSe)‐perovskite tandem solar cells: nickel oxide (NiOx,), copper‐doped nickel oxide (NiOx:Cu), NiOx+SAM, NiOx:Cu+SAM, and SAM, where SAM is the [2‐(3,‐6Dimethoxy‐9H‐carbazol‐9yl)ethyl]phosphonic acid (MeO‐2PACz) self‐assembled monolayer. The performance of the devices is correlated to the charge‐carrier dynamics at the HTL/perovskite interface and the limiting factors of these HTLs are analyzed by performing time‐resolved and absolute photoluminescence ((Tr)PL), transient surface photovoltage (tr‐SPV), and X‐ray/UV photoemission spectroscopy (XPS/UPS) measurements on indium tin oxide (ITO)/HTL/perovskite and CIGSe/HTL/perovskite stacks. A high quasi‐Fermi level splitting to open‐circuit (QFLS‐Voc) deficit is detected for the NiOx‐based devices, attributed to electron trapping and poor hole extraction at the NiOx‐perovskite interface and a low carrier effective lifetime in the bulk of the perovskite. Simultaneously, doping the NiOx with 2% Cu and passivating its surface with MeO‐2PACz suppresses the electron trapping, enhances the holes extraction, reduces the non‐radiative interfacial recombination, and improves the band alignment. Due to this superior interfacial charge‐carrier dynamics, NiOx:Cu+SAM is found to be the most suitable HTL for the monolithic CIGSe‐perovskite tandem devices, enabling a power‐conversion efficiency (PCE) of 23.4%, Voc of 1.72V, and a fill factor (FF) of 71%, while the remaining four HTLs suffer from prominent Voc and FF losses.
Production and subsequent forming of chip-based aluminium sheets without remelting
Creators: name: Schulze, André
name: Hering, Oliver
name: Tekkaya, A. Erman
Publisher: name: TU Dortmund
Year: 2021
Subjects: subject: Recycling
subject: Chip extrusion
subject: Solid state recycling
subject: Metal forming
subject: Sustainability
subject: Aluminium scrap recycling
subject: 620
subject: 670
subject: Aluminiumblech
subject: Blechumformen
subject: Aluminiumrückgewinnung
subject: Sekundäraluminium
subject: Strangpressen
subject: Metallspan
subject: Recycling

description: Bent components and deep drawn cups are produced by direct usage of aluminium chips without melting following a new process chain: hot extrusion of aluminium chips to a cylindrical open profile, flattening, subsequent rolling and bending or deep drawing. The properties of the hot extruded chip-based AA6060 sheets are examined by tensile tests and microstructural investigations and the results are compared with those obtained from material extruded from conventional cast billets. The chip-based sheets were used to form components by bending or deep drawing. No significant differences between the bent components or deep-drawn cups made of chips and those from cast material are observed regarding their capability for further plastic forming operations. This makes the new process route a resource-efficient alternative for the production of aluminium sheet products.
description: International journal of precision engineering and manufacturing-green technology;Vol. 9. 2022, pp 1035-1048
Home Sweet Office: The Great Debate Between Couches and Cubicles
Creators: name: Bodemer, Oliver
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 380199
subject: Applied economics not elsewhere classified

description: In the wake of unprecedented global shifts, the traditional office landscape has undergone a dramatic transformation. This study delves into the heart of the ongoing debate: Work from Home (WFH) versus Return to Office (RTO). Through a comprehensive analysis of employee productivity, job satisfaction, and work-life balance, we aim to unravel the complexities and implications of these contrasting work environments.Our research employs a mixed-method approach, incorporating quantitative surveys and qualitative interviews from a diverse pool of participants across various industries. We explore the nuanced benefits and challenges of WFH, such as increased flexibility and potential isolation, alongside the dynamics of RTO, including collaboration opportunities and potential commute stress.The findings reveal a multifaceted picture, highlighting that the ideal work setting is not one-size-fits-all but rather depends on individual preferences, job nature, and organizational culture. This study offers valuable insights for companies navigating the post-pandemic era, emphasizing the need for adaptable and empathetic work policies. Ultimately, "Home Sweet Office" sheds light on the evolving nature of work and the importance of fostering environments that resonate with the diverse needs of the modern workforce.
Quantification of gas-accessible microporosity in metal-organic framework glasses
Creators: name: Frentzel-Beyme, Louis
name: Henke, Sebastian
name: Kolodzeiski, Pascal
name: Weiß, Jan-Benedikt
name: Schneemann, Andreas
Publisher: name: TU Dortmund
Year: 2022
Subjects: subject: Metal–organic frameworks
subject: Porous materials
subject: Solid-state chemistry
subject: 540

description: Metal-organic framework (MOF) glasses are a new class of glass materials with immense potential for applications ranging from gas separation to optics and solid electrolytes. Due to the inherent difficulty to determine the atomistic structure of amorphous glasses, the intrinsic structural porosity of MOF glasses is only poorly understood. Here, we investigate the porosity features (pore size and pore limiting diameter) of a series of prototypical MOF glass formers from the family of zeolitic imidazolate frameworks (ZIFs) and their corresponding glasses. CO2 sorption at 195 K allows quantifying the microporosity of these materials in their crystalline and glassy states, also providing excess to the micropore volume and the apparent density of the ZIF glasses. Additional hydrocarbon sorption data together with X-ray total scattering experiments prove that the porosity features of the ZIF glasses depend on the types of organic linkers. This allows formulating design principles for a targeted tuning of the intrinsic microporosity of MOF glasses. These principles are counterintuitive and contrary to those established for crystalline MOFs but show similarities to strategies previously developed for porous polymers.
description: Nature communications;Vol. 13. 2022, Art. ID 7750
title: Brief
Creators: name: Holler, Manfred J.
Year: 2017

description: Mit einer Beilage von 4 Blättern (Forschungsprojekt "Arbeitsmarkt" - Projektbeschreibung, 2. Fassung). - Beilage ist ein Typoskript mit handschriftlichen Korrekturen.
description: Typoskript mit Unterschrift, 5 Blätter
title: Ανάπτυξη συστήματος ενεργειακής διαχείρισης με βάση το πρότυπο ISO 50001 σε βιομηχανία παραγωγής προϊόντων διογκωμένου πολυστυρενίου (EPS)
title: Development of an energy management system based on ISO 50001 standard in an expanded polystyrene production industry (EPS)
Creators: name: Καταλαγαριανακης Ευαγγελος
Publisher: name: Technical University of Crete
Year: 2020

description: Σκοπός της παρούσας διπλωματικής εργασίας είναι η περιγραφή και ανάλυση των διαδικασιών του σχεδιασμού και της ανάπτυξης ενός Συστήματος Ενεργειακής Διαχείρισης (ΣΕΔ), με βάση το πρότυπο ISO 50001, σε μια βιομηχανία παραγωγής προϊόντων διογκωμένου πολυστυρενίου. Για να γίνει αυτό, θα πρέπει οι γενικές απαιτήσεις και διαδικασίες του προτύπου να προσαρμοστούν στη λειτουργία, τις ενεργειακές πλευρές και τους στόχους της βιομηχανίας, προκειμένου να δημιουργηθεί για εκείνη ένα αποτελεσματικό εγχειρίδιο ενεργειακής διαχείρισης. Τελικός στόχος για τη βιομηχανία, είναι η επιτυχημένη εφαρμογή του Συστήματος Ενεργειακής Διαχείρισης, όπου θα επιτρέψει τη συστηματική παρακολούθηση, μέτρηση, αξιολόγηση και εν τέλει βελτίωση της ενεργειακής της απόδοσης.
Τέλος, πέρα από την ανάλυση των απαιτήσεων του προτύπου ISO 50001, πραγματοποιήθηκε η εφαρμογή ενός μοντέλου πολυκριτήριας ανάλυσης, με σκοπό την εκτίμηση και τη σύγκριση της Ενεργειακής Απόδοσης της βιομηχανίας, με βάση τα κριτήρια και τους στόχους που η ίδια έχει ορίσει. Το μοντέλο αυτό στηρίζεται στη σύγκριση των τιμών των Δεικτών Ενεργειακής Απόδοσης (ΔΕΑ) που αναπτύχθηκαν στα πλαίσια του ΣΕΔ και για την εφαρμογή του απαιτεί:
• τον υπολογισμό των ΔΕΑ με βάση πραγματικά ενεργειακά δεδομένα της βιομηχανίας
• την θέσπιση των επιθυμητών τιμών - στόχων για τους ΔΕΑ
• τον υπολογισμό της σχετικής απόκλισης από του στόχους
την επιλογή συνάρτησης προτίμησης για κάθε δείκτη, μέσω της οποίας αποτυπώνεται η αυστηρότητα για τον τρόπο που θα υπολογιστεί η αξία της σχετικής απόκλισης
• τον καθορισμό βαρών (βάρη ROC) για τους δείκτες ανάλογα με τη σημασία και τη βαρύτητα τους για τη βιομηχανία
Τα παραπάνω δεδομένα συνδυάζονται με τη χρήση μιας συνάρτησης αξιών/ χρησιμότητας, προκειμένου να υπολογιστούν οι αποδόσεις των δεικτών συγκριτικά με την επιθυμητή τιμή τους.
Essential oils of Marrubium L. taxa from aegian province of Turkey
Creators: name: T. Demiroz Akbulut
name: B. Demirci
name: S. Baykan
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: A comparative study on the essential oil (EO) compositions of seven Marrubium taxa from nine locations in Aegean province of Turkey was performed by this study. The essential oils analysed by gas chromatography (GC) and gas chromatography-mass spectroscopy (GC-MS). The major compounds of all species were detected as sesquiterpenes; (Z)-β-farnesene, germacrene D, β-caryophyllene, caryophyllene oxide and bicyclogermacrene in variable rates for different taxa. Moreover, this is the first study on EO composition of endemic M. rotundifolium Boiss. and chemical variabilities of the EOs of other Marrubium taxa collected from Turkey.
A caryophyllene oxide and other potential anticholinesterase and anticancer agent in Salvia verticillata subsp. amasiaca (Freyn & Bornm.) Bornm. (Lamiaceae)
Creators: name: Songul Karakaya
name: Yilmaz, Serdar Volkan
name: Özdemir, Özlem
name: Koca, Mehmet
name: Pınar, Nur Münevver
name: Demirci, Betül
name: Yıldırım, Kadir
name: Sytar, Oksana
name: Turkez, Hasan
name: K. Hüsnü Can Baser
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Neuroscience
subject: Physiology
subject: Evolutionary Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Hematology

description: In vitro cholinesterase inhibition, antioxidant and anticancer potentials of the essential oils and extracts of flowers and aerial parts of Salvia verticillata subsp. amasiaca have been studied. The GC-MS and GC-FID analyses found that major components of the essential oils were caryophyllene oxide, caryophylladienol II, spathulenol, hexahydrofarnesyl acetone and phytol. Oxygenated sesquiterpenes and sesquiterpene hydrocarbons were identified in the essential oils as the dominating groups of compounds. Caryophyllene oxide indicated strong cholinesterase inhibitory activities and antioxidant effect. The essential oil from aerial parts exhibited high anticancer activity on U-87 MG and PC-3 cells with 0% and 45.56% cell viability, respectively. Microscopic analysis of different parts of the experimental plant revealed that glandular trichomes of flowers contain more oxygenated sesquiterpene hydrocarbons, while glandular trichomes of the aerial parts contain monoterpene hydrocarbons. It was confirmed that S. verticillata subsp. amasiaca had similar kinds of capitate and peltate trichomes like other Salvia members.
How many knowledge Claims are there in a Scientific Text? A Study of three Neuroscientific Articles’ content as reflected in the Citing Publications
Creators: name: Shkurko, Alexander V.
Publisher: name: Социология науки и технологий
Year: 2018
Subjects: scientometrics
citation analysis; publication; citation context
citation content
knowledge claim

description: Citations are treated as a mark of scientific contribution indicating its value for the scientific community. The in-depth studies of citing behavior show different motivation to cite and various types of citations challenging the view that all citations should be treated as equal. One aspect of citations, however, remains underestimated. Not only researchers can interpret the cited article in different ways and attribute different significance to it, but they can focus on different pieces of knowledge embedded in the text. In this study, citations are used to identify how many different knowledge objects can be extracted from one scientific publication by the scientific community. Three academic articles in neuroscience are chosen as target articles. Samples of the publications citing target articles are analyzed to reveal the cognitive content associated with them by other researchers. The study showed that the diversity of knowledge associated with one scientific text is high: a number of different knowledge objects identified by other researchers varies from 12 to 56. Knowledge objects are distributed unevenly in the sample. A small number of knowledge objects are most popular whereas others are appearing seldom. However, the diversity of citations’ content shows that a scientific publication can be valued for different reasons and there are numerous ways how it can contribute to scientific growth.
Measurement details and additional analyses of leaf hydraulic relationships from Leaf hydraulic safety margin and safety–efficiency trade-off across angiosperm woody species
Creators: name: Chao-Long Yan
name: Ni, Ming-Yuan
name: Kun-Fang Cao
name: Zhu, Shi-Dan
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: Plant Biology

description: Measurements of hydraulic traits; relationship between Kleaf and P50leaf between arid and humid habitats and using phylogenetic analysis; relationships between leaf hydraulic traits and climatic variables.
UntitledEmotion regulation flexibility: strategy monitoring and switching
Creators: name: Adamczyk, Agnieszka
Publisher: name: OSF Registries
Year: 2022
Subjects: subject: Social and Behavioral Sciences
subject: EEG
subject: ERP
subject: Late Positive Potential
subject: anterior prefrontal cortex
subject: cognitive reappraisal
subject: decision-making
subject: distraction
subject: electromyography
subject: emotion regulation
subject: emotion regulation flexibility
subject: lateral frontal pole
subject: source localization
subject: spectral analysis
subject: strategy monitoring
subject: strategy switching

description: Emotion regulation (ER) flexibility is the ability to adaptively switch between different ER strategies to adjust them to changing situational demands. Although greater flexibility is associated with better mental health, the neurocognitive mechanisms involved in this adaptive process have scarcely been explored. In the present study, we use an ER strategy switching task and measure electrocortical activity from healthy young adults (N = 64, age = 18-35 years, females) to investigate the neural mechanisms involved in performance-based monitoring processes and decision-making in the context of ER. Specifically, using state-of-the-art advanced source reconstruction and connectivity analyses, we plan to investigate the involvement of the medial and lateral frontopolar cortex (FPC) in monitoring the (current and alternative) ER strategy effectiveness, and the neural coupling between FPC and parietal cortex during implementation of a strategy switch. Moreover, we plan to replicate and extend findings by (Birk & Bonanno, 2016; Dorman Ilan et al., 2019; Shafir et al., 2016) using event-related potentials (ERPs, Late Positive Potential) and electromyographic (EMG, corrugator) activity with an improved task design to test whether reduced ER strategy effectiveness predicts switching to the alternative ER strategy (and whether this consequently results in improved regulatory effects).
title: The role of sea urchins and kelp loss in changing the assemblage structure and trait diversity of shallow marine communities
Creators: name: Schuster, Jasmin M.
Publisher: name: Memorial University of Newfoundland
Year: 2023

description: Coastal habitats, such as kelp forests, are declining in many areas of the ocean. Change is driven by various factors, including increases in sea urchins, which are kelp consumers (grazers) that can rapidly remove kelp forests and create barrens devoid of macroalgae. At the same time, warming and cooling trends and extreme heat events due to anthropogenic climate change are restructuring reef communities around the globe. Biological assemblages found on shallow reefs are thus responding to the loss of complex habitat and ocean temperature changes simultaneously. The aims of this thesis were to: I) examine responses of shallow marine populations and communities to kelp loss, with a focus on urchin-driven kelp loss; and II) assess whether kelp loss alters assemblage vulnerability to anthropogenic temperature change. In my thesis I utilized measures of an organisms’ fundamental physiological response, and global biodiversity data from kelp ecosystems, to assess assemblage change at multiple levels of biological organization and from local to global spatiotemporal scales. I found that neighbouring kelp and sea urchin barren habitats have populations and communities with different physiological characteristics that relate to energetics. For example, green sea urchin (Strongylocentrotus droebachiensis) populations from kelp forests had higher routine metabolic rates across the range of temperatures tested than those from adjacent barrens. Sea urchins from kelp forests were also less sensitive to temperature increases than their barrens counterparts. Findings from subsequent experiments suggest that metabolic differences among sea urchin populations relate to the availability of kelp as a food source. At the community level, I report that kelp and barren habitats also host fish communities with distinct realized thermal affinities and geographic range sizes, with more warm-affinity species in regions close to the tropics present at barrens than in kelp habitats. Sea urchins, thus, facilitate tropicalization processes on rocky reefs in temperate regions. Similar tropicalization signals also emerged in a kelp forest ecosystem during two severe heat events in the Pacific Northwest, with stronger signals of tropicalization in urchin barrens than at kelp forested sites. Overall, loss of kelp (as habitat and food source) leads to a reorganization of reef assemblages, moving assemblages towards greater sensitivity to warming. My findings highlight the importance of protecting and restoring complex habitats to maintain the functioning and diversity of marine biological assemblages.