cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Baryon self energies in the chiral loop expansion
Creators: name: Semke, A.
name: Lutz, M. F. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We compute the self energies of the baryon octet and decuplet states at the one-loop level applying the manifestly covariant chiral Lagrangian. It is demonstrated that expressions consistent with the expectation of power counting rules arise if the self energies are decomposed according to the Passarino-Veltman scheme supplemented by a minimal subtraction. This defines a partial summation of the chiral expansion. A finite renormalization required to install chiral power counting rules leads to the presence of an infrared renormalization scale. Good convergence properties for the chiral loop expansion of the baryon octet and decuplet masses are obtained for natural values of the infrared scale. A prediction for the strange-quark matrix element of the nucleon is made.
description: 36 pages, 4 figures, 8 tables. The revised manuscript contains a proof that given any one-loop integral that arises when computing one-baryon processes it is sufficient to renormalize the scalar master-loop functions of the Passarino-Veltman reduction in a manner that the latter are compatible with the expectation of chiral counting rules
$Υ$ production and nuclear modification at forward rapidity in Pb-Pb collisions at $\mathbf{\sqrt{\textit{s}_{\textbf{NN}}}=5.02}$ TeV
Creators: name: ALICE Collaboration
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The production of $Υ$ mesons in Pb-Pb collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}}$ = 5 TeV is measured with the muon spectrometer of the ALICE detector at the LHC. The yields as well as the nuclear modification factors are determined in the forward rapidity region $2.5
description: 24 pages, 7 captioned figures, 2 tables, authors from page 19, published version, figures at http://alice-publications.web.cern.ch/node/6694
Research on Gentle Loosening of Solidified Bolted Joints for Complex Capital Goods
Creators: name: Blümel, Richard
name: Raatz, Annika
Publisher: name: Amsterdam [u.a.] : Elsevier
Year: 2022
Subjects: subject: Bolt Connections
subject: Disassembly
subject: Regeneration
subject: Solidification
subject: Vibration
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: The consideration of sustainability is increasingly becoming a focus in research and production. For example, the recycling process for products that are no longer usable should be optimally prepared by separating materials by type as far as possible. In addition, products should be made usable again by repair or replacement if only sub-components fail. In the case of complex capital goods, like aircraft engines, it is mandatory to preserve the product since damage to the joining partners can lead to immense costs. A decisive factor in this context are assembly connections, which have a major influence on the complexity of disassembly. Concerning this matter, detachable connections, like screwed joints, have many advantages for service, repair and recycling compared with permanent fixing solutions. They can reduce assembly time, simplify maintenance processes, and greatly reduce maintenance time and costs. However, during a product's life cycle, threaded connections can corrode, leading to damage or even failure of the bolted joints. Beyond that, they can solidify and often only be disassembled destructively. In this article, we present an approach to improve the loosening of operational solidified screwed connections. It is well known that vibrations during operation can reduce the preload force of the connections. We exploit this aspect by inducing vibrations through micro impacts to alleviate the loosening torque of the solidified bolted connection. Depending on the direction of the vibration (torsional or axial), that can ensure a gentle and component-friendly disassembly to a greater or lesser extent in contrast to destroying the screw by drilling or shearing and splitting with the risk of damaging the product being maintained. The designed experimental setup with a piezo actuator allows us to investigate the amplitude and frequency of the induced vibrations for the required disassembly force. The results show that our approach enables component-conserving disassembly, as the forces can be significantly reduced.
Coffee Lecture Digital: Forschungsethik. Research Ethics.
Creators: name: Strauch, Annette
Publisher: name: Zenodo
Year: 2020
Subjects: FDM
Forschungsdatenmanagement
Forschungsdatenmanagement Hildesheim
UB Hildesheim
Universitätsbibliothek Hildesheim

description: Forscherinnen und Forscher können sich, wenn sie bereit für ein Forschungsdatenmanagement sind, jederzeit in der Universitätsbibliothek Hildesheim zum Umgang mit Daten informieren. Wir kommen dabei auf der technischen Ebene gut, kontinuierlich weiter und gehen ganz verantwortungsvoll mit der Wissenschaftsfreiheit um. Noch vor Beginn der geplanten Forschungsprojekte denken wir das Thema Forschungsethik, Ethik in den Wissenschaften und sicherheitsrelevante Forschung mit, um Mißbrauch von Forschung zu vermeiden. In Beratungen zum FDM (‘First-Level’ - Support) ist die Forschungsethik immer ein Thema, beim qualitativen oder quantitativen Forschungsprozess. Die Art der Datenerhebung hat sich in den letzten Jahren stark verändert. Wir gehen mit Smartphones und Tablets, usw., ins "Feld". Was ist dabei zu beachten? Ethik als Disziplin sucht „die allgemeinen Prinzipien oder Beurteilungskriterien zur Beantwortung der Frage nach dem richtigen Handeln zu begründen“(vgl. Diener, Edward, Crandall, Rick (1978): Ethics in Social and Behavioral Research). Zentrale Elemente zur Forschungsethik, neben der Verantwortung, sind Überlegungen zur Wertebasis und ethische Entscheidungsfindungen: Wer trägt Verantwortung als Forscherin und Forscher? Wofür tragen die Forschenden eigentlich die Verantwortung, d.h. für welche Handlungen in ihrer Forschungstätigkeit und wem gegenüber? Bei diesen Überlegungen müssen immer die Anforderungen der Ethikstandards in den Fachgesellschaften erfüllt werden. Auch im Bereich des Maschinellen Lernens, Big Data, Künstliche Intelligenz und Algorithmen werden alle angeregt, sich um eine ethische Reflexion des Forschungsthema zu kümmern. In der der Biologie oder in den den Lebenswissenschaften, bei Projekten der Politikwissenschaften und in den Erziehungs-und Sprachwissenschaften werden forschungsethische Fragen gestellt, also an allen Fachbereichen der eigenen Universität.
Aerodynamic Feeding 4.0: A New Concept for Flexible Part Feeding
Creators: name: Kolditz, Torge
name: Raatz, Annika
Publisher: name: Amsterdam [u.a.] : Elsevier
Year: 2022
Subjects: subject: separated by semicolons
subject: Type your keywords here
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: In modern production environments, the need for flexible handling systems constantly increases due to increasing uncertainties, shorter product life cycles and higher cost pressure. Part feeding systems are vital to modern handling systems, but conventional solutions are often characterized by low flexibility, high retooling times, and complex design. Therefore, in previous research, multiple approaches towards aerodynamic feeding technology were developed. Using air instead of mechanical chicanes to manipulate workpieces, aerodynamic feeding systems can achieve high feeding rates while at the same time being very flexible and reliable. Still, the complexity of the workpieces that can be oriented relies on the number of aerodynamic actuators used in the system. Previously developed systems either used one nozzle with a constant air jet or one nozzle and an air cushion, allowing a maximum of two orientation changes. This work presents a new concept for an aerodynamic feeding system with higher flexibility (with regard to the workpiece geometry) and drastically reduced retooling times compared to conventional feeding systems. In contrast to previous implementations of aerodynamic feeding systems, using only one air nozzle or an air cushion, the new concept uses multiple, individually controllable air nozzles. Using a simulation-based approach, the orientation process is divided into several basic rotations - from a random initial orientation to the desired end orientation - each performed by a distinct nozzle. An optimization algorithm is then used to determine an optimal layout of the air nozzles, enabling the feeding system to feed any desired workpiece, regardless of the initial orientation. With the proposed concept, high flexibility, low retooling times and relatively low costs are expected, setting up aerodynamic feeding as an enabler for changeable production environments.
An emergent universe from a loop
Creators: name: Mulryne, David J.
name: Tavakol, Reza
name: Lidsey, James E.
name: Ellis, George F. R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Closed, singularity-free, inflationary cosmological models have recently been studied in the context of general relativity. Despite their appeal, these so called emergent models suffer from a number of limitations. These include the fact that they rely on an initial Einstein static state to describe the past eternal phase of the universe. Given the instability of such a state within the context of general relativity, this amounts to a very severe fine tuning. Also in order to be able to study the dynamics of the universe within the context of general relativity, they set the initial conditions for the universe in the classical phase. Here we study the existence and stability of such models in the context of Loop Quantum Cosmology and show that both these limitations can be partially remedied, once semi-classical effects are taken into account. An important consequence of these effects is to give rise to a static solution (not present in GR), which dynamically is a centre equilibrium point and located in the more natural semi-classical regime. This allows the construction of emergent models in which the universe oscillates indefinitely about such an initial static state. We construct an explicit emergent model of this type, in which a non-singular past eternal oscillating universe enters a phase where the symmetry of the oscillations is broken, leading to an emergent inflationary epoch, while satisfying all observational and semi-classical constraints. We also discuss emergent models in which the universe possesses both early- and late-time accelerating phases.
description: 11 pages, 8 figures
Para-Kähler-Einstein 4-manifolds and non-integrable twistor distributions
Creators: name: Bor, Gil
name: Makhmali, Omid
name: Nurowski, Paweł
Publisher: name: arXiv
Year: 2020
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: Primary: 53C10, Secondary: 53C15, 58A30, 58A15, 53C29

description: We study the local geometry of 4-manifolds equipped with a \emph{para-Kähler-Einstein} (pKE) metric, a special type of split-signature pseudo-Riemannian metric, and their associated \emph{twistor distribution}, a rank 2 distribution on the 5-dimensional total space of the circle bundle of self-dual null 2-planes. For pKE metrics with nonvanishing Einstein constant this twistor distribution has exactly two integral leaves and is `maximally non-integrable' on their complement, a so-called (2,3,5)-distribution. Our main result establishes a simple correspondence between the anti-self-dual Weyl tensor of a pKE metric with non-vanishing Einstein constant and the Cartan quartic of the associated twistor distribution. This will be followed by a discussion of this correspondence for general split-signature metrics which is shown to be much more involved. We use Cartan's method of equivalence to produce a large number of explicit examples of pKE metrics with nonvanishing Einstein constant whose anti-self-dual Weyl tensor have special real Petrov type. In the case of real Petrov type $D,$ we obtain a complete local classification. Combined with the main result, this produces twistor distributions whose Cartan quartic has the same algebraic type as the Petrov type of the constructed pKE metrics. In a similar manner, one can obtain twistor distributions with Cartan quartic of arbitrary algebraic type. As a byproduct of our pKE examples we naturally obtain para-Sasaki-Einstein metrics in five dimensions. Furthermore, we study various Cartan geometries naturally associated to certain classes of pKE 4-dimensional metrics. We observe that in some geometrically distinguished cases the corresponding \emph{Cartan connections} satisfy the Yang-Mills equations. We then provide explicit examples of such Yang-Mills Cartan connections.
description: 45 pages; Minor corrections; Final version
Coffee Lecture Digital: Planen und Strukturieren (SUH Hildesheim, UB Hildesheim).
Creators: name: Strauch, Annette
Publisher: name: Zenodo
Year: 2020
Subjects: Forschungsdaten
Forschungsdatenmanagement
Research Data
Research Datamanagement
Digitale Bibliotheken
Universitätsbibliotheken

description: Das FDM soll uns allen die Arbeit erleichtern. Wir versuchen unser Bestes, um es so einfach wie möglich zu handhaben. Um Fehler zu spät und langes Suchen zu vermeiden, ist es sinnvoll, gleich zu Beginn des Projektes Zeit in eine systematische Organisation der Dateien und Ordner zu investieren. Dies ist besonders wichtig, wenn mit anderen Forschenden und Forschungsgruppen kooperativ geforscht wird. Gerade hier sollten sich alle Projektmitarbeiter und Projektmitarbeiterinnen mit einem Schema einverstanden erklären und dieses einhalten. Auch wir empfehlen, das Organisations- und Benennungssystem schriftlich festzuhalten. Bei der Datenpublikation kann das Dokument abgegeben werden. Repositorien sind Speicherorte für digitale Objekte, die diese für einen öffentlichen oder beschränkten Nutzer/innenkreis zur Verfügung stellen. Auch das ist Thema dieser Coffee Lecture sowie die Qualität von Forschungsdaten.
Per l'occhio e per l'orecchio. Meditazioni sulla lettura ad alta voce in Frankenstein.
Creators: name: Francesca, Saggini
Publisher: name: Zenodo
Year: 2020
Subjects: Frankenstein
Mary Shelley
Pegagody
Options for teaching
history of reading

description: Lettore, leggi mai ad alta voce? Sei passato mai, per caso o intenzionalmente, dalla lettura
 silenziosa, quella per l’occhio—che scorre rapidamente lungo la pagina, veloce, muovendosi
 di carattere in carattere, di parola in parola—alla lettura per l’orecchio, una lettura
 che soppesa, gusta, si sofferma su ciascun suono e ciascuna sillaba, che si gonfiano nel
 passaggio attraverso gli organi vocali e ne prendono la colorazione prima di entrare nel
 mondo sonoro ed ermeneutico dell’ascoltatore?
Contour Tracking Control for Mobile Robots applicable to Large-scale Assembly and Additive Manufacturing in Construction
Creators: name: Lachmayer, Lukas
name: Recker, Tobias
name: Raatz, Annika
Publisher: name: Amsterdam [u.a.] : Elsevier
Year: 2022
Subjects: subject: separated by semicolons
subject: Type your keywords here
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: In the construction industry, as well as during the assembly of large-scale components, the required workspaces usually cannot be served by a stationary robot. Instead, mobile robots are used to increase the accessible space. Here, the problem arises that the accuracy of such systems is not sufficient to meet the tolerance requirements of the components to be produced. Furthermore, there is an additional difficulty in the trajectory planning process since the exact dimensions of the pre-manufactured parts are unknown. Hence, existing static planning methods cannot be exerted on every application. Recent approaches present dynamic planning algorithms based on specific component characteristics. For example, the latest methods follow the contour by a force-controlled motion or detect features with a camera. However, in several applications such as welding or additive manufacturing in construction, no contact force is generated that could be controlled. Vision-based approaches are generally restricted by varying materials and lighting conditions, often found in large-scale construction. For these reasons, we propose a more robust approach without measuring contact forces, which, for example, applies to large-scale additive manufacturing. We based our algorithm on a high-precision 2D line laser, capable of detecting different feature contours regardless of material or lightning. The laser is mounted to the robot's end-effector and provides a depth profile of the component's surface. From this depth data, we determine the target contour and control the manipulator to follow it. Simultaneously we vary the robot's speed to adjust the feed rate depending on the contour's shape, maintaining a constant material application rate. As a proof of concept, we apply the algorithm to the additive manufacturing of two-layer linear structures made from spray PU foam. When making these structures, each layer must be positioned precisely on the previous layer to obtain a straight wall and prevent elastic buckling or plastic collapse. Initial experiments show improved layer alignment within 10 % of the layer width, as well as better layer height consistency and process reliability.
Effect of mechanical finishing on residual stresses and application behavior of wire arc additive manufactured aluminum components
Creators: name: Denkena, Berend
name: Wichmann, Marcel
name: Pillkahn, Philipp
Publisher: name: Amsterdam [u.a.] : Elsevier
Year: 2022
Subjects: subject: additive manufacturing
subject: application behavior
subject: residual stresses
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: Wire arc additive manufacturing (WAAM) offers great potential for the production of automobile components due to its high material deposition rates, low costs and design freedom. In order to meet the requirements regarding surface integrity and lifetime, the parts must be mechanically finished after WAAM. However, the subsurface properties (e.g. residual stresses) and consequently the application behavior are significantly influenced by the mechanical finishing process. Thus, the effects of deep rolling and heat treatment on the residual stresses and lifetime of AlSi12 and AlSi10Mg parts produced by WAAM are investigated and the results are presented in this paper. Deep rolling was found to induce compressive residual stresses into additive manufactured AlSi12 and AlSi10Mg workpieces. Furthermore, deep rolling increased the lifetime of the WAAM components significantly. With a combination of a heat treatment and subsequent deep rolling AlSi10Mg workpieces were manufactured securely fail-safe.
Spin Hot Spots in vertically-coupled Few-electron Quantum Dots
Creators: name: Bagga, Anjana
name: Pietilainen, Pekka
name: Chakraborty, Tapash
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The effects of spin-orbit (SO) coupling arising from the confinement potential in single and two vertically-coupled quantum dots have been investigated. Our work indicates that a dot containing a single electron shows the lifting of the degeneracy of dipole-allowed transitions at B=0 due to the SO coupling which disappears for a dot containing two electrons. For coupled dots with one electron in each dot, the optical spectra is not affected by the coupling and is the same as the dot containing one electron. However, for the case of two coupled dots where one partner dot has two interacting electrons while the other dot has only one electron, a remarkable effect is observed where the oscillator strength of two out of four dipole-allowed transition lines disappears as the distance between the dots is decreased.
$\rm Λ_{c}^{+}$ production and baryon-to-meson ratios in pp and p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV at the LHC
Creators: name: ALICE Collaboration
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The prompt production of the charm baryon $\rm Λ_{c}^{+}$ and the $\rm Λ_{c}^{+}/\mathrm {D^0}$ production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$TeV. These new measurements show a clear decrease of the $\rm Λ_{c}^{+}/\mathrm {D^0}$ ratio with increasing transverse momentum ($p_{\rm T}$) in both collision systems in the range $2
description: 20 pages, 2 captioned figures, authors from page 14, published version, figures at http://alice-publications.web.cern.ch/node/6702
Ballistic Phonon Thermal Transport in Multi-Walled Carbon Nanotubes
Creators: name: Chiu, H. -Y.
name: Deshpande, V. V.
name: Postma, H. W. Ch.
name: Lau, C. N.
name: Mikó, C.
name: Forró, L.
name: Bockrath, M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report electrical transport experiments using the phenomenon of electrical breakdown to perform thermometry that probe the thermal properties of individual multi-walled nanotubes. Our results show that nanotubes can readily conduct heat by ballistic phonon propagation, reaching a quantum-mechanical limit to thermal conductance. We determine the thermal conductance quantum, the ultimate limit to thermal conductance for a single phonon channel, and find good agreement with theoretical calculations. Moreover, our results suggest a breakdown mechanism of thermally activated C-C bond breaking coupled with the electrical stress of carrying ~10^12 A/m^2. We also demonstrate a current-driven self-heating technique to improve the conductance of nanotube devices dramatically.
[Brev til DKNVS]
Creators: name: Schwach, Conrad Nicolai
name: Det Kongelige Norske Videnskabers Selskab (DKNVS)
Publisher: name: Unknown
Year: 1834

description: Vedr. VS' lokaler
description: Brevet er undertegnet også av Johan Christian Tellefsen. . Polydoc nr. 1: 2075. Polydoc nr. 2: 1496.
Sustainability Assessment of Products manufactured by the Laser Powder Bed Fusion (LPBF) Process
Creators: name: Wurst, Johanna
name: Mozgova, Iryna
name: Lachmayer, Roland
Publisher: name: Amsterdam [u.a.] : Elsevier
Year: 2022
Subjects: subject: Additive Manufacturing
subject: Laser Powder Bed Fusion
subject: Sustainability Assessment
subject: Systematic Literature Review
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: Assessing the sustainability of a product is dependent on considering individual product life cycle data. Based on the information on material, energy and information flows, evaluation tools such as the life cycle assessment (LCA) or the calculation of the cumulative energy consumption can be used. Especially the methodology of LCA according to ISO 14040/44 allows a selection of alternative analysis and measurement cycles as well as a combination of impact assessment indicators that have a direct and significant influence on sustainability. The comparison of various manufacturing processes allows the identification of relations between the applied evaluation tools and the product- as well as process-specific parameters during the production phase, and throughout the entire product life cycle. Within the various case studies considered, a distinction can be made both between the definition and the indicators of sustainability and between the ecological, economic or social dimensions within the motivation formulated. This paper describes the results of the literature review on the sustainability assessment of additive manufacturing processes in general as well as the Laser Powder Bed Fusion process as an example. A research map shows which phases of the product life cycle of an additive manufactured component are considered and which methods can be used to assess their sustainability. The result is a summary of the state of the art regarding the methods of sustainability assessment of additive manufacturing processes. In addition, an outlook can be determined on how the different phases of the product life cycle can be evaluated with tools that currently receive less attention.
Development of a form-flexible handling technology with active cooling for hybrid components in forging processes
Creators: name: Ince, Caner-Veli
name: Geggier, Jan
name: Bruns, Christopher
name: Raatz, Annika
Publisher: name: Amsterdam [u.a.] : Elsevier
Year: 2021
Subjects: subject: Automation
subject: Form variable gripper
subject: Handling
subject: High temperature
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: Tailored Forming is a novel manufacturing process for the production of forged hybrid components. In contrast to components made of mono-materials, hybrid components can be adapted to the respective loads by combining different materials with contradictory properties. Short processing times and high component quality, however, lead to the demand for automated handling and local active cooling within the forming process, since the appropriate processing temperature is particularly important. Due to the fact that the hybrid components are differently hot and change their shape during the forming process, a special gripper system must be provided, which can withstand high temperatures, and ensures both shape variability and local cooling. Nowadays, however, there is a gap between shape variable grippers and rigid grippers for temperature-sensitive processes without any integrated cooling functionalities. Therefore, this paper presents an approach for the development of shape variable high temperature grippers with the use-case of handling hot steel-aluminium hybrid components.
Self-supervised Graph Learning for Recommendation
Creators: name: Wu, Jiancan
name: Wang, Xiang
name: Feng, Fuli
name: He, Xiangnan
name: Chen, Liang
name: Lian, Jianxun
name: Xie, Xing
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Representation learning on user-item graph for recommendation has evolved from using single ID or interaction history to exploiting higher-order neighbors. This leads to the success of graph convolution networks (GCNs) for recommendation such as PinSage and LightGCN. Despite effectiveness, we argue that they suffer from two limitations: (1) high-degree nodes exert larger impact on the representation learning, deteriorating the recommendations of low-degree (long-tail) items; and (2) representations are vulnerable to noisy interactions, as the neighborhood aggregation scheme further enlarges the impact of observed edges. In this work, we explore self-supervised learning on user-item graph, so as to improve the accuracy and robustness of GCNs for recommendation. The idea is to supplement the classical supervised task of recommendation with an auxiliary self-supervised task, which reinforces node representation learning via self-discrimination. Specifically, we generate multiple views of a node, maximizing the agreement between different views of the same node compared to that of other nodes. We devise three operators to generate the views -- node dropout, edge dropout, and random walk -- that change the graph structure in different manners. We term this new learning paradigm as \textit{Self-supervised Graph Learning} (SGL), implementing it on the state-of-the-art model LightGCN. Through theoretical analyses, we find that SGL has the ability of automatically mining hard negatives. Empirical studies on three benchmark datasets demonstrate the effectiveness of SGL, which improves the recommendation accuracy, especially on long-tail items, and the robustness against interaction noises. Our implementations are available at \url{https://github.com/wujcan/SGL}.
description: 11 pages, 7 figures, 5 tables. Accepted by SIGIR 2021
The Recent International and Regulatory Decisions about Geographical Indications
Creators: name: Marette, Stephan
name: Clemens, Roxanne
name: Babcock, Bruce A.
name: Marette, Stephan
name: Clemens, Roxanne
name: Babcock, Bruce A.
Publisher: name: Unknown
Year: 2007
Subjects: subject: International Relations/Trade
subject: geographical indications
subject: product labels
subject: trade barriers

description: As worldwide consumer demand for high-quality products and for information about these products increases, labels and geographical indications (GIs) can serve to signal quality traits to consumers. However, GI systems among countries are not homogeneous and can be used as trade barriers against competition. Philosophical differences between the European Union and the United States about how GIs should be registered and protected led to the formation of a WTO dispute settlement panel. In this paper we discuss the issues behind the dispute, the World Trade Organization (WTO) panel decision, and the EU response to the panel decision leading to the new Regulation 510/2006. Given the potential for GI labels to supply consumer information, context is provided for the discussion using recent literature on product labeling. Implications are drawn regarding the importance of the panel decision and the EU response relative to GI issues yet to be negotiated under the Doha Round.
1 Brief an [August Adolf Ludwig Follen], H[ans] G[eorg] Nägeli
Brief an Follen ...
Creators: name: Hirzel, Konrad Melchior
Publisher: name: [s.n.]
Year: 1832

description: von [Konrad] M[elchior] Hirzel
description: Brief von Hirzel an Follen von diesem mit Begleitschreiben weitergeleitet an H.G. Nägeli
The Gothic in Nineteenth-Century Italy
Creators: name: Francesca, Saggini
Publisher: name: Zenodo
Year: 2020
Subjects: Gothic
nineteenth century
literature

description: Is there an Italian Gothic of the nineteenth century? At first glance, the question may appear redundant, particularly for Anglophone readers accustomed to associating Italy not just with the Grand Tourists and nostalgic antiquarianism of the eighteenth century, but also with the imaginative geography of the Gothic canon, the cultural and topological setting of masterpieces such as Horace Walpole’s The Castle of Otranto (1764) and the novels of Ann Radcliffe, from A Sicilian Romance (1790) to The Italian; or, The Confessional of the Black Penitents (1796–7), to mention just two authors linked
 by a pervasive interdiscursive and intertextual Italophile network. Given its deeper implications, my opening question should therefore be broadened and qualified: was there an indigenous or autochthonous Gothic in nineteenth-century Italy, a local reworking of English (and perhaps also Continental) forms and models – a Gothic ‘under the sun’, so to speak, capable of exercising its aesthetic and thematic influence at a supranational level?
Coffee Lecture: Aufbereiten und Veröffentlichen. Daten teilen. Sommersemester 2020, UB Hildesheim (Stiftung Universität Hildesheim).
Creators: name: Strauch, Annette
Publisher: name: Zenodo
Year: 2020
Subjects: Forschungsdaten
Forschungsdatenmanagement
FDM
Bibliotheken
Universitätsbibliotheken
UB Hildesheim
Universitätsbibliothek Hildesheim
Niedersachsen
Digitalstrategie Niedersachsen
FDM Niedersachsen
Forschungsdatenmanagement Niedersachsen
Forschung
eScience
Lower Saxony
Libraries

description: Veröffentlichte Daten bringen sehr großen Nutzen. Nur so kann, z.B. die globale, interdisziplinäre Forschung über Pandemien ermöglicht und daraus neue Erkenntnisse gewonnen werden. Das FDM soll uns die Arbeit erleichtern. Wir versuchen unser Bestes, um es so einfach wie möglich zu machen. Dafür geben wir Ihnen den Zugang zu Tools und Informationen, damit Sie Ihre Forschungsdaten besser organisieren. Häufig ist es so, dass Daten nur von einem Forscher, einer Forscherin oder einer Arbeitsgruppe bearbeitet und analysiert werden und danach auf einem USB-Stick gespeichert in einer Schublade verschwinden. Unter anderem beschäftigen wir uns mit FDM wegen einer neuartigen Datennutzung, Nachnutzung / Publikation. Ein häufiger Ansatz generischer Infrastruktureinrichtungen ist immer noch, dass Bibliotheken und RZ auf klassische Publikationsparadigma fokussieren und dabei oft den Forschungsprozess ignorieren. Wichtige Fragen sind für mich / uns wie wir Forschungsdaten übernehmen können? Und gerade: wie können wir Forschungsdaten mit den vorhandenen Recherchetools bereitstellen? Das Teilen von Daten ermöglicht eine weltweite Arbeitsaufteilung. Forscherinnen und Forscher können je nach Zeit, Ressourcen und Aufgabengebieten ihren eigenen Blick auf die Daten werfen und sie entsprechend ihrer individuellen Bedürfnisse analysieren.
Batch time optimization for an aerodynamic feeding system under changing ambient conditions
Creators: name: Kolditz, Torge
name: Rochow, Niklas
name: Nyhuis, Peter
name: Raatz, Annika
Publisher: name: Amsterdam [u.a.] : Elsevier
Year: 2021
Subjects: subject: Aerodynamic feeding system
subject: Batch time optimization
subject: Simulation
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: In order to meet the demands for flexible feeding technology, a self-learning aerodynamic part feeding system has been developed. The actuated system uses a genetic algorithm to find the optimal parameter set for a high rate of correctly oriented parts. This orientation rate can change due to changes in the ambient conditions (e.g. ambient pressure, coefficient of friction). When the orientation rate in pre-defined interval of parts drops below a determined value, a correction algorithm is triggered. The objective of this work is to develop a mathematical model to define the optimal control interval and limit of the orientation rate for triggering the corrective algorithm depending on the total amount of parts still to be fed at any point in time. To evaluate the mathematical approach, a macroscopic simulation model of the aerodynamic feeding system was developed. It was shown, that the feeding time of a batch of 10,000 parts can be reduced by up to 7% and the number of activations of the corrective algorithm can be reduced by up to 50%. Finally, the mathematical model was implemented in the system control.
Modelling the effect of ribosome mobility on the rate of protein synthesis
Creators: name: Dauloudet, Olivier
name: Neri, Izaak
name: Walter, Jean-Charles
name: Dorignac, Jérôme
name: Geniet, Frédéric
name: Parmeggiani, Andrea
Publisher: name: arXiv
Year: 2020
Subjects: subject: Subcellular Processes (q-bio.SC)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Translation is one of the main steps in the synthesis of proteins. It consists of ribosomes that translate sequences of nucleotides encoded on mRNA into polypeptide sequences of amino acids. Ribosomes bound to mRNA move unidirectionally, while unbound ribosomes diffuse in the cytoplasm. It has been hypothesized that finite diffusion of ribosomes plays an important role in ribosome recycling and that mRNA circularization enhances the efficiency of translation. In order to estimate the effect of cytoplasmic diffusion on the rate of translation, we consider a Totally Asymmetric Simple Exclusion Process (TASEP) coupled to a finite diffusive reservoir, which we call the Ribosome Transport model with Diffusion (RTD). In this model, we derive an analytical expression for the rate of protein synthesis as a function of the diffusion constant of ribosomes, which is corroborated with results from continuous-time Monte Carlo simulations. Using a wide range of biological relevant parameters, we conclude that diffusion in biological cells is fast enough so that it does not play a role in controlling the rate of translation initiation.
description: article, 16 pages, 5 figures
Die Wiederaufnahme des Gesprächs mit den "Horizontalisten"
Creators: name: Berkhof, Hendrikus
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 19 Nr. 2 (1970): Ökumenische Rundschau, Band 19, Heft 2
Intuitive robot programming using augmented reality
Creators: name: Blankemeyer, Sebastian
name: Wiemann, Rolf
name: Posniak, Lukas
name: Pregizer, Christoph
name: Raatz, Annika
Publisher: name: Amsterdam [u.a.] : Elsevier
Year: 2018
Subjects: subject: Augmented reality
subject: Human-machine-interaction
subject: Intuitive robot programming
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: The demands on companies caused by the markets are becoming more and more fast-moving and complex. Reasons are the increasing number of variants of products as well as reduced product life cycle times. This is particularly relevant for assembly tasks, since a very high flexibility and adaptability to varying ambient condition must be ensured in this area. Therefore, a lot of steps are currently being carried out manually. However, if an automation is attempted in the field of assembly, companies are often facing a trade-off between a high degree of automation and flexibility of the production system. A concept to increase the automation rate in assembly tasks can be seen in the use of collaborative robots, so that the benefits of both, humans and robots, can be combined to accomplish the task. In doing so, one key issue is to simplify and thus to accelerate the programming process so that the necessary programming skills of employees can be reduced. Although some of today’s collaborative robots already offer good programming approaches like kinesthetic teaching, this article introduces a new and more intuitive programming method which is based on Augmented Reality. For this purpose, components of an assembly group are virtually linked with CAD models by using optical markers. The operator can then virtually assemble the components according to the assembly sequence. Results of first tests indicate, that once the assembly process is recorded, the robot can accomplish the assembly in reality. Finally, possibilities for future developments are presented.
"Give me back the real me": the politics of identity and The Ecstasy of Rita Joe, 1967-1992
Creators: name: Krueger, Colleen
Publisher: name: University of British Columbia
Year: 2009

description: Practically since its celebrated premiere in 1967, George Ryga's drama about urban Native Canadians, The Ecstasy of Rita Joe, has enjoyed canonical status in Canada. Yet the same three decades that have seen over 200 productions of Rita Joe have also witnessed radical transformations in the ways First Nations' peoples are represented, heard and perceived in Canada. How has a play written about Natives by a non-Native man in 1967 managed such a long production history on such contentious and unstable ground? How do identity politics influence this piece of theatre, and how does the theatre shape identity politics? As popular notions about Native identities have changed and as Native people continue to represent themselves in and put of court, and on and off the stage, this play about Native people in Canada has been performed and re-performed. But the directors, the venues, the actors, the costumes and sets, the language itself and (most significantly) the resulting characterizations have changed over the years — in subtle and rather dramatic ways. While the words and the fundamental plot of Rita Joe have remained the same, its messages about Native identity has evolved since 1967, in relation to social, political, economic, and cultural changes. Indeed, historical developments impact the particular ways an "Indian" is represented in a particular time; what makes a "real Indian" tends to shift with the political and social needs of the moment. This paper examines the way Native identity is represented in eight productions of Rita Joe mounted between 1967 and 1992, creating a production history that focuses on the relationship between representations of identity and particular moments in time and space and, ultimately, discerns a complex and symbiotic relationship between the aesthetic, creative world and the historio-political world. Perhaps most remarkably, the play stretches to accommodate diverse cultural narratives, gathering meaning from the identity politics of its particular performance place and time.
Reversible and irreversible trapping at room temperature in poly(thiophene) thin-film transistors
Creators: name: Salleo, A.
name: Endicott, F.
name: Street, R. A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We measured the bias stress characteristics of poly(thiophene) semi-crystalline thin-film transistors (TFTs) as a function stress times, gate voltages and duty-cycles. At room temperature, the bias stress has two components: a fast reversible component and a slow irreversible component. We hypothesize that the irreversible component is due to charge trapping in the disordered areas of the semiconductor film. At low duty-cycle (<2%), the fast bias stress component is reversed during the off-part of the cycle therefore the observed VT shift in only caused by irreversible trapping. Irreversible trapping follows power-law kinetics with a time exponent approximately equal to 0.37. We use these findings to estimate the lifetime of TFTs used as switches in display backplanes.
title: Ποιότητα ζωής και λειτουργική ικανότητα αθλητών κλασικού αθλητισμού με ακρωτηριασμό κάτω άκρων
title: Quality of life and functional capacity of track and field athletes with lower limb amputation
titleType: AlternativeTitle
Creators: name: Ανδρακάκου, Αγγελική
Publisher: name: Πανεπιστήμιο Πελοποννήσου
Year: 2022
Subjects: subject: Αθλητισμός για άτομα με ειδικές ανάγκες
subject: Ποιότητα ζωής - Άτομα με ειδικές ανάγκες
subject: Ακρωτηριασμός - Ψυχολογικές απόψεις
subject: Πόδι - Ακρωτηριασμός
subject: Sports for people with disabilities
subject: Quality of life - People with disabilities
subject: Amputation - Psychological aspects
subject: Foot - Amputation
subject: Ακρωτηριασμός κάτω άκρου
subject: Αθλητισμός
subject: Ποιότητα ζωής
subject: Lower limb amputation
subject: Sports
subject: Quality of life

description: Ένας ακρωτηριασμός έχει περιγραφεί σαν τη μετάβαση από την αναπηρία στην τεχνητή αρτιμέλεια με τις προθέσεις να θεωρούνται ως οικεία προέκταση του σώματος. Ένας ενεργητικός τρόπος ζωής σε άτομα με ακρωτηριασμό κάτω άκρων συνοδεύεται από αξιοσημείωτα σωματικά, ψυχολογικά, συναισθηματικά και κοινωνικά οφέλη προάγοντας έτσι την Ποιότητα Ζωής. Παρά την αυτονόητη σπουδαιότητα του αθλητισμού, υπάρχει μεγάλος αριθμός ατόμων με ακρωτηριασμό που εξακολουθεί να υιοθετεί έναν αδρανή τρόπο ζωής μολονότι οι ευκαιρίες για άθληση είναι περισσότερες από τις προηγούμενες δεκαετίες. Σκοπός της μελέτης είναι να συγκεκριμενοποιήσει τους παράγοντες που καθορίζουν την καθημερινότητα αυτών των ατόμων και να ρίξει φως στο αν η επίδραση του αθλητισμού έχει θετικό ή αρνητικό πρόσημο στην Ποιότητα Ζωής τους, λόγω της ιδιαιτερότητας της αναπηρίας. Τα ερωτηματολόγια TAPES-R (Gallagher, Dasmond & MacLachlan, 2010) και SF-36v2 (Anagnostopoulos, Niakas & Pappa, 2005) χορηγήθηκαν σε 52 άτομα με ακρωτηριασμό (n=21 αθλητές Κλασικού Αθλητισμού, n=31 άτομα χωρίς αθλητική δραστηριότητα). Η ηλικία τους κυμάνθηκε από 21 έως 70 έτη (M=35,2, SD=11.67). Τα αποτελέσματα έδειξαν πως η αιτία ακρωτηριασμού στην Ελλάδα οφείλεται πρωτίστως σε τροχαία ατυχήματα. Οι αθλητές με ακρωτηριασμό δήλωσαν καλύτερη φυσική κατάσταση συγκριτικά με τους μη αθλητές αλλά δεν διαπιστώθηκε καμία διαφορά στις οχτώ κλίμακες της Ποιότητας Ζωής. Οι αθλητές με ακρωτηριασμό συγκριτικά με τους αρτιμελείς αθλητές παρουσίασαν πτωτικές τάσεις στις κλίμακες Φυσικής Λειτουργικότητας και Πόνου. Aθλητές και μη αθλητές με ακρωτηριασμό εμφάνισαν πτωτική τάση στις κλίμακες της Φυσικής Λειτουργικότητας, Περιορισμού ρόλου λόγω σωματικής υγείας, Γενικής Υγείας και Πόνου, συγκριτικά με τους αρτιμελείς. Συμπερασματικά: Ο Αθλητισμός έχει θετικά οφέλη και δεν προκαλεί περαιτέρω σωματική επιβάρυνση στα άτομα με ακρωτηριασμό. Ο παράγοντας Πόνος αποκαλύπτεται πολύ καθοριστικός για την Ποιότητα Ζωής τους. Η πρακτική εφαρμογή αυτής της μελέτης είναι να χαραχθούν στρατηγικές ενσωμάτωσης μεγαλύτερου αριθμού ατόμων με ακρωτηριασμό σε προγράμματα άθλησης με στόχο την προαγωγή της υγείας τους και τη βελτίωση της Ποιότητας Ζωής τους, η οποία δικαιωματικά τους ανήκει.
Jet fragmentation transverse momentum distributions in pp and p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV
Creators: name: ALICE Collaboration
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Jet fragmentation transverse momentum ($j_{\rm T}$) distributions are measured in proton-proton (pp) and proton-lead (p-Pb) collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV with the ALICE experiment at the LHC. Jets are reconstructed with the ALICE tracking detectors and electromagnetic calorimeter using the anti-$k_{\rm T}$ algorithm with resolution parameter $R=0.4$ in the pseudorapidity range $|η|<0.25$. The $j_{\rm T}$ values are calculated for charged particles inside a fixed cone with a radius $R = 0.4$ around the reconstructed jet axis. The measured $j_{\rm T}$ distributions are compared with a variety of parton-shower models. Herwig and PYTHIA 8 based models describe the data well for the higher $j_{\rm T}$ region, while they underestimate the lower $j_{\rm T}$ region. The $j_{\rm T}$ distributions are further characterised by fitting them with a function composed of an inverse gamma function for higher $j_{\rm T}$ values (called the "wide component"), related to the perturbative component of the fragmentation process, and with a Gaussian for lower $j_{\rm T}$ values (called the "narrow component"), predominantly connected to the hadronisation process. The width of the Gaussian has only a weak dependence on jet transverse momentum, while that of the inverse gamma function increases with increasing jet transverse momentum. For the narrow component, the measured trends are successfully described by all models except for Herwig. For the wide component, Herwig and PYTHIA 8 based models slightly underestimate the data for the higher jet transverse momentum region. These measurements set constraints on models of jet fragmentation and hadronisation.
description: 29 pages, 8 captioned figures + 3 captioned figures in appendix, 1 table, authors from page 21, published version, figures at http://alice-publications.web.cern.ch/node/6695