cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fatigue cracking of lumber bandsaw blades
Creators: name: Lu, Hongtao
Publisher: name: University of British Columbia
Year: 2008

description: The focus of this research is on the fatigue cracking problem in the tooth gullet region of wide handsaw blades used in the lumber industry. This thesis presents both the theory and the experiment aspects of this research in terms of the tasks defined as follows. The current literature was reviewed to critically examine the current state-of-the-art in smooth and cracked body analysis techniques and their application in the failure analysis of a bandsaw blade. The advantage of the fracture mechanics approach insolving the problem was recognized and useful information was identified. Experimental testing was conducted to obtain the mechanical properties of the blade material and to establish the cracking resistance curve which defines the stability threshold of cracks inthis material. Experimental testing was also conducted to determine crack propagation behaviour in handsaw blade material subjected to representative loading conditions. Based on the experiment data obtained, a failure analysis of a blade under assumed loading conditions was performed. Critical crack lengths which a blade can tolerate under the assumed loads were calculated. A fatigue crack propagation model has been proposed and used in the failure analysis of commonly used blades. The results offer explanations for cracking problem in the tooth gullet. The failure analysis also shows that careful handling of the blade resharpening process can substantially prolong the fatigue life of a saw blade.
archäologischer Beleg für einen kuschitischen Kopfschmuck
Creators: name: Lohwasser, Angelika
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 17 (2006): Der Antike Sudan
An investigation into tool-wear and phenomena influencing tool-life in milling
Creators: name: Oyawoye, Orisunmbola A.
Publisher: name: University of British Columbia
Year: 2008

description: The subjects of tool-life, tool-wear and machinability have attracted extensive research interest most of which have been directed toward turning operations. The added complexity of milling operations, resulting from both the discontinuous nature of the process and the varying chip thickness during cut, are the reason for reduced research interest in comparison to turning. Although several researchers have examined the milling process, considerable controversy still surrounds the basic factors influencing tool-life in milling. In the study of the basic factors involved in the milling of both high strength steel and titanium alloy work materials, the basic form of the equations which result tend to support a thermal fatigue process as the most likely source of difference between continuous and discontinuous cutting. To validate this hypothesis further, special tests have been conducted within an inert atmosphere to ascertain the influence of oxidation on wear rate. It is also found that the influence of exit conditions may be critical in some circumstances, and experiments have again been carried out to examine this phenomenon. Finally, from a consideration of the tracking of tool-wear in milling operations, a comprehensive scheme which allows both identification of cutting conditions and tracking of wear on end mills and face mills is presented.
Unsupervised Deep Image Stitching: Reconstructing Stitched Features to Images
Creators: name: Nie, Lang
name: Lin, Chunyu
name: Liao, Kang
name: Liu, Shuaicheng
name: Zhao, Yao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Traditional feature-based image stitching technologies rely heavily on feature detection quality, often failing to stitch images with few features or low resolution. The learning-based image stitching solutions are rarely studied due to the lack of labeled data, making the supervised methods unreliable. To address the above limitations, we propose an unsupervised deep image stitching framework consisting of two stages: unsupervised coarse image alignment and unsupervised image reconstruction. In the first stage, we design an ablation-based loss to constrain an unsupervised homography network, which is more suitable for large-baseline scenes. Moreover, a transformer layer is introduced to warp the input images in the stitching-domain space. In the second stage, motivated by the insight that the misalignments in pixel-level can be eliminated to a certain extent in feature-level, we design an unsupervised image reconstruction network to eliminate the artifacts from features to pixels. Specifically, the reconstruction network can be implemented by a low-resolution deformation branch and a high-resolution refined branch, learning the deformation rules of image stitching and enhancing the resolution simultaneously. To establish an evaluation benchmark and train the learning framework, a comprehensive real-world image dataset for unsupervised deep image stitching is presented and released. Extensive experiments well demonstrate the superiority of our method over other state-of-the-art solutions. Even compared with the supervised solutions, our image stitching quality is still preferred by users.
description: Accepted by IEEE Transactions on Image Processing
Radiocarbon Dates of Islang 2 and Nofalab 2
Creators: name: Kahbir, Abdelrahim M.
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 17 (2006): Der Antike Sudan
Phases of Swift X-ray Afterglows
Creators: name: Panaitescu, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The X-ray afterglows observed by Swift exhibit rich light-curves, with four phases of different decay rate. The temporal and spectral properties for a set of 47 bursts are used to identify the mechanisms which can explain these four phases. The early, fast-decaying phase can be attributed to the same mechanism which generated the burst emission (internal shocks in a relativistic outflow), while the following phases of slower decay can be identified with synchrotron emission from the forward shock sweeping the circumburst medium. Most likely, the phase of slowest decay is due to a continuous energy injection in the forward shock. That the optical power-law decay continues unabated after the end of energy injection requires an ambient medium with a wind-like density structure (n propto r^{-2}) and forward shock microphysical parameters that change with the shock's Lorentz factor. A later break of the X-ray light-curve can be attributed to a collimated outflow whose boundary becomes visible to the observer (a jet) but the optical and X-ray decays are not always consistent with the standard jet model expectations.
description: 17 pages. First half will appear in Il Nuovo Cimento ("Swift and GRBs: unveiling the relativistic Universe" meeting, Venice, Italy, 5-9 June 2006). Second half will appear in AIP Conf. Procs. ("Multicoloured landscape of compact objects" meeting, Cefalu, Italy, 11-24 June 2006)
Spin relaxation in a generic two-dimensional spin-orbit coupled system
Creators: name: Stanescu, Tudor D.
name: Galitski, Victor
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study the relaxation of a spin density injected into a two-dimensional electron system with generic spin-orbit interactions. Our model includes the Rashba as well as linear and cubic Dresselhaus terms. We explicitly derive a general spin-charge coupled diffusion equation. Spin diffusion is characterized by just two independent dimensionless parameters which control the interplay between different spin-orbit couplings. The real-time representation of the diffuson matrix (Green's function of the diffusion equation) is evaluated analytically. The diffuson describes space-time dynamics of the injected spin distribution. We explicitly study two regimes: The first regime corresponds to negligible spin-charge coupling and is characterized by standard charge diffusion decoupled from the spin dynamics. It is shown that there exist several qualitatively different dynamic behaviors of the spin density, which correspond to various domains in the spin-orbit coupling parameter space. We discuss in detail a few interesting phenomena such as an enhancement of the spin relaxation times, real space oscillatory dynamics, and anisotropic transport. In the second regime, we include the effects of spin-charge coupling. It is shown that the spin-charge coupling leads to an enhancement of the effective charge diffusion coefficient. We also find that in the case of strong spin-charge coupling, the relaxation rates formally become complex and the spin/charge dynamics is characterized by real time oscillations. These effects are qualitatively similar to those observed in spin-grating experiments [Weber et al., Nature 437, 1330 (2005)].
description: 18 pages, 7 figures
Rocking and rolling: a can that appears to rock might actually roll
Creators: name: Srinivasan, Manoj
name: Ruina, Andy
Publisher: name: arXiv
Year: 2007
Subjects: subject: Classical Physics (physics.class-ph)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: A beer bottle or soda can on a table, when slightly tipped and released, falls to an upright position and then rocks up to a somewhat opposite tilt. Superficially this rocking motion involves a collision when the flat circular base of the container slaps the table before rocking up to the opposite tilt. A keen eye notices that the after-slap rising tilt is not generally just diametrically opposite the initial tilt but is veered to one side or the other. Cushman and Duistermaat (2006) recently noticed such veering when a flat disk with rolling boundary conditions is dropped nearly flat. Here, we generalize these rolling disk results to arbitrary axi-symmetric bodies and to frictionless sliding. More specifically, we study motions that almost but do not quite involve a face-down collision of the round container's bottom with the table-top. These motions involve a sudden rapid motion of the contact point around the circular base. Surprisingly, like for the rolling disk, the net angle of motion of this contact point is nearly independent of initial conditions. This angle of turn depends simply on the geometry and mass distribution but not on the moment of inertia about the symmetry axis. We derive simple asymptotic formulas for this "angle of turn" of the contact point and check the result with numerics and with simple experiments. For tall containers (height much bigger than radius) the angle of turn is just over $π$ and the sudden rolling motion superficially appears as a nearly symmetric collision leading to leaning on an almost diametrically opposite point on the bottom rim.
description: 10 pages, 5 figures
Humboldt University Nubian Expedition 2006
Creators: name: Näser, Claudia
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 17 (2006): Der Antike Sudan
Strength of advanced ceramic breeder pebbles: influence of fabrication methods, composition and annealing
Creators: name: Kolb, Matthias
Publisher: name: KIT Scientific Publishing
Year: 2019
Subjects: Fusion
Brutkeramik
Orthosilikat
Metatitanat
Festigkeit
ceramic breeder
orthosilicate
metatitanate
strength

description: The strength of advanced ceramic breeder pebbles, consisting of Li4SiO4 and Li2TiO3 as well as lithium excessive Li2TiO3 was investigated with the focus on the influence of different relevant fabrication methods, compositions and after thermal annealing. Within this work, the failure mechanisms of the pebbles were determined as well as their causes. Regarding the long term stability of the pebbles it is clear that with the use of a suitable composition significant improvements can be achieved.
H.U.N.E. 2006: Alltagsleben der Frauen im Dorf Kirbekān
Creators: name: Weschenfelder, Petra
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 17 (2006): Der Antike Sudan
Generative Chemical Transformer: Neural Machine Learning of Molecular Geometric Structures from Chemical Language via Attention
Creators: name: Kim, Hyunseung
name: Na, Jonggeol
name: Lee, Won Bo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Discovering new materials better suited to specific purposes is an important issue in improving the quality of human life. Here, a neural network that creates molecules that meet some desired conditions based on a deep understanding of chemical language is proposed (Generative Chemical Transformer, GCT). The attention mechanism in GCT allows a deeper understanding of molecular structures beyond the limitations of chemical language itself which cause semantic discontinuity by paying attention to characters sparsely. It is investigated that the significance of language models for inverse molecular design problems by quantitatively evaluating the quality of the generated molecules. GCT generates highly realistic chemical strings that satisfy both chemical and linguistic grammar rules. Molecules parsed from generated strings simultaneously satisfy the multiple target properties and vary for a single condition set. These advances will contribute to improving the quality of human life by accelerating the process of desired material discovery.
The efficacy of online computer games in the consolidation of L2 vocabulary
Creators: name: Τόττα, Άννα Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Ηλεκτρονικά Γλωσσικά Παιχνίδια
Εμπέδωση
Γ2 Λεξιλόγιο
Online Computer Games
Consolidation
L2 Vocabulary

description: The purpose of the present qualitative small-scale study was to investigate the effectiveness of online vocabulary computer games in the consolidation of L2 vocabulary. More particularly, this research study examines the validity of the hypothesis that online computer games benefit L2 vocabulary and lead to the better and deeper consolidation of it in comparison to the traditional written practice of it through handouts. With respect to the participants of the study, it involved ten Greek learners of English, who studied English privately, either at a private language center or in private English lessons, at home, aged between 10 and 12 years old. The five students of the private language center made up the control group, who took a written quiz with the target vocabulary. The rest of the participants comprised the experimental group, who took the online vocabulary games, which contained the same type and number of items as the written quiz. All in all, the results of this particular survey shed light on the extent of the effectiveness of the online vocabulary games, as regards the consolidation of the target vocabulary, compared to conventional methods of vocabulary teaching.
description: Η παρούσα διπλωματική εργασία είχε ως σκοπό να διερευνήσει την αποτελεσματικότητα των ηλεκτρονικών γλωσσικών παιχνιδιών στην εμπέδωση του Γ2 λεξιλογίου. Πιο συγκεκριμένα, εξετάζει την εγκυρότητα της υπόθεσης ότι τα ηλεκτρονικά γλωσσικά παιχνίδια έχουν θετική επίδραση στο Γ2 λεξιλόγιο και οδηγούν στην καλύτερη και πιο ουσιαστική εμπέδωση του σε σύγκριση με την παραδοσιακή γραπτή εξάσκηση του μέσω φυλλαδίων. Όσον αφορά τους συμμετέχοντες της έρευνας, συμπεριέλαβε δέκα Έλληνες μαθητές της αγγλικής γλώσσας, οι οποίοι κάνουν μαθήματα αγγλικών ιδιωτικά, είτε σε κέντρα ξένων γλωσσών, είτε στο σπίτι τους, ηλικίας μεταξύ 10 και 12 ετών. Οι πέντε μαθητές του ιδιωτικού κέντρου ξένων γλωσσών ανήκαν στην ομάδα ελέγχου, που έλυσε μια φωτοτυπία γραπτώς με το στοχευμένο λεξιλόγιο. Οι υπόλοιποι συμμετέχοντες αποτέλεσαν την πειραματική ομάδα που έπαιξαν τα ηλεκτρονικά παιχνίδια λεξιλογίου, τα οποία περιείχαν την ίδια μορφή και αριθμό στοιχείων και ασκήσεων με τη φωτοτυπία. Τελικώς, τα αποτελέσματα της παρούσας έρευνας τονίζουν το βαθμό της αποτελεσματικότητας των ηλεκτρονικών γλωσσικών παιχνιδιών, όσον αφορά την εμπέδωση του στοχευμένου Γ2 λεξιλογίου, συγκριτικά με συμβατικές μεθόδους διδασαλίας λεξιλογίου.
Time-dependent quantum many-body theory of identical bosons in a double well: Early time ballistic interferences of fragmented and number entangled states
Creators: name: Masiello, David J.
name: Reinhardt, William P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: A time-dependent multiconfigurational self-consistent field theory is presented to describe the many-body dynamics of a gas of identical bosonic atoms confined to an external trapping potential at zero temperature from first principles. A set of generalized evolution equations are developed, through the time-dependent variational principle, which account for the complete and self-consistent coupling between the expansion coefficients of each configuration and the underlying one-body wave functions within a restricted two state Fock space basis that includes the full effects of the condensate's mean field as well as atomic correlation. The resulting dynamical equations are a classical Hamiltonian system and, by construction, form a well-defined initial value problem. They are implemented in an efficient numerical algorithm. An example is presented, highlighting the generality of the theory, in which the ballistic expansion of a fragmented condensate ground state is compared to that of a macroscopic quantum superposition state, taken here to be a highly entangled number state, upon releasing the external trapping potential. Strikingly different many-body matter-wave dynamics emerge in each case, accentuating the role of both atomic correlation and mean-field effects in the two condensate states.
description: 16 pages, 5 figures
A Hidden Challenge of Link Prediction: Which Pairs to Check?
Creators: name: Belth, Caleb
name: Büyükçakır, Alican
name: Koutra, Danai
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The traditional setup of link prediction in networks assumes that a test set of node pairs, which is usually balanced, is available over which to predict the presence of links. However, in practice, there is no test set: the ground-truth is not known, so the number of possible pairs to predict over is quadratic in the number of nodes in the graph. Moreover, because graphs are sparse, most of these possible pairs will not be links. Thus, link prediction methods, which often rely on proximity-preserving embeddings or heuristic notions of node similarity, face a vast search space, with many pairs that are in close proximity, but that should not be linked. To mitigate this issue, we introduce LinkWaldo, a framework for choosing from this quadratic, massively-skewed search space of node pairs, a concise set of candidate pairs that, in addition to being in close proximity, also structurally resemble the observed edges. This allows it to ignore some high-proximity but low-resemblance pairs, and also identify high-resemblance, lower-proximity pairs. Our framework is built on a model that theoretically combines Stochastic Block Models (SBMs) with node proximity models. The block structure of the SBM maps out where in the search space new links are expected to fall, and the proximity identifies the most plausible links within these blocks, using locality sensitive hashing to avoid expensive exhaustive search. LinkWaldo can use any node representation learning or heuristic definition of proximity, and can generate candidate pairs for any link prediction method, allowing the representation power of current and future methods to be realized for link prediction in practice. We evaluate LinkWaldo on 13 networks across multiple domains, and show that on average it returns candidate sets containing 7-33% more missing and future links than both embedding-based and heuristic baselines' sets.
Kirbekan – Ein Dorf der Manasir am 4. Nilkatarakt Teil II
Creators: name: Eigner, Dieter
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 17 (2006): Der Antike Sudan
Prähistorische Fundplätze
Creators: name: Jeuthe, Clara
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 17 (2006): Der Antike Sudan
H.U.N.E. 2006: Survey und Grabungen am linken Flussufer
Creators: name: Budka, Julia
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 17 (2006): Der Antike Sudan
Nebular Emission from Lanthanide-rich Ejecta of Neutron Star Merger
Creators: name: Hotokezaka, Kenta
name: Tanaka, Masaomi
name: Kato, Daiji
name: Gaigalas, Gediminas
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The nebular phase of lanthanide-rich ejecta of a neutron star merger (NSM) is studied by using a one-zone model, in which the atomic properties are represented by a single species, neodymium (Nd). Under the assumption that beta-decay of r-process nuclei is the heat and ionization source, we solve the ionization and thermal balance of the ejecta under non-local thermodynamic equilibrium. The atomic data including energy levels, radiative transition rates, collision strengths, and recombination rate coefficients, are obtained by using atomic structure codes, GRASP2K and HULLAC. We find that both permitted and forbidden lines roughly equally contribute to the cooling rate of Nd II and Nd III at the nebular temperatures. We show that the kinetic temperature and ionization degree increase with time in the early stage of the nebular phase while these quantities become approximately independent of time after the thermalization break of the heating rate because the processes relevant to the ionization and thermalization balance are attributed to two-body collision between electrons and ions at later times. As a result, in spite of the rapid decline of the luminosity, the shape of the emergent spectrum does not change significantly with time after the break. We show that the emission-line nebular spectrum of the pure Nd ejecta consists of a broad structure from $0.5\,μm$ to $20\,μm$ with two distinct peaks around $1\,μm$ and $10\,μm$.
description: 20 pages, 18 figures, submitted to MNRAS
Non-Equilibrium Ionization Model for Stellar Cluster Winds and its Application
Creators: name: Ji, Li
name: Wang, Q. Daniel
name: Kwan, John
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have developed a self-consistent physical model for super stellar cluster winds based on combining a 1-D steady-state adiabatic wind solution and a non-equilibrium ionization calculation. Comparing with the case of collisional ionization equilibrium, we find that the non-equilibrium ionization effect is significant in the regime of a high ratio of energy to mass input rate and manifests in a stronger soft X-ray flux in the inner region of the star cluster. Implementing the model in X-ray data analysis softwares (e.g., XSPEC) directly facilitates comparisons with X-ray observations. Physical quantities such as the mass and energy input rates of stellar winds can be estimated by fitting observed X-ray spectra. The fitted parameters may then be compared with independent measurements from other wavelengths. Applying our model to the star cluster NGC 3603, we find that the wind accounts for no more than 50% of the total "diffuse" emission, and the derived mass input rate and terminal velocity are comparable to other empirical estimates. The remaining emission most likely originate from numerous low-mass pre-main-sequence stellar objects.
description: 29 pages, 17 figures. accepted by MNRAS
An Empirical Investigation of Pull Requests in Partially Distributed BizDevOps Teams
Creators: name: Stray, V.
name: Moe, N. B.
name: Mikalsen, M.
name: Hagen, E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: In globally distributed projects, virtual teams are often partially dispersed. One common setup occurs when several members from one company work with a large outsourcing vendor based in another country. Further, the introduction of the popular BizDevOps concept has increased the necessity to cooperate across departments and reduce the age-old disconnection between the business strategy and technical development. Establishing a good collaboration in partially distributed BizDevOps teams requires extensive collaboration and communication techniques. Nowadays, a common approach is to rely on collaboration through pull requests and frequent communication on Slack. To investigate barriers for pull requests in distributed teams, we examined an organization located in Scandinavia where cross-functional BizDevOps teams collaborated with off-site team members in India. Data were collected by conducting 14 interviews, observing 23 entire days with the team, and observing 37 meetings. We found that the pull-request approach worked very well locally but not across sites. We found barriers such as domain complexity, different agile processes (timeboxed vs. flow-based development), and employee turnover. Using an intellectual capital lens on our findings, we discuss barriers and positive and negative effects on the success of the pull-request approach.
Purpuricenus globulicollis Dejean 1839
Creators: name: Chittaro, Yannick
name: Sanchez, Andreas
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Cerambycidae
Purpuricenus
Purpuricenus globulicollis

description: L’individu de P. globulicollis
a été capturé dans un piège posé sur un Pinus sylvestris, le long de la Morge, près de Conthey (Suisse: VS, 650 m, 13.VI-3.VII.2011, leg. Chittaro, coll. Chittaro, 1 ♀) (Fig. 1A). Le site, prospecté depuis plusieurs années par le premier auteur, présente une grande diversité de milieux: zones de pinède et chênaie thermophile mais également secteurs plus frais colonisés par des Salix spp., Betula spp., Populus tremula et Picea abies. De nombreuses espèces de coléoptères rares y avaient été précédemment trouvées, à l’instar de Chrysobothris solieri Laporte & Gory, 1839 (Buprestidae) et Pogonocherus caroli Mulsant, 1862 (Cerambycidae), espèces surtout liées aux zones thermophiles, ainsi que Ceruchus chrysomelinus (Hochenwart, 1785) (Lucanidae) et Ampedus melanurus Mulsant & Guillebeau, 1855 (Elateridae), liés à des zones plus fraîches.
La révision des spécimens de P. kaehleri des différentes collections examinées n’a pas permis de mettre en évidence d’autres individus de P. globulicollis.
DISCUSSION
Diagnose
La différentiation des deux espèces suisses de Purpuricenus est assez délicate, du fait de leur grande ressemblance morphologique. Plusieurs critères sont donnés par Villiers (1978), Bense (1995), Grousset (2004), Recalde Iruzun & San Martin Moreno (2007) et sont résumés dans le Tableau 1.
Si la plupart des individus peuvent être déterminés sans trop de problèmes, quelquesuns sont cependant plus difficiles (Fig. 1C) et l’examen de tous les critères est nécessaire.
description: Published as part of Chittaro, Yannick & Sanchez, Andreas, 2012, Purpuricenus globulicollis Dejean, 1839, nouveau pour la Suisse (Coleoptera: Cerambycidae), pp. 47-53 in Entomo Helvetica 5 on pages 49-50, DOI: 10.5169/seals-986120, http://zenodo.org/record/8039467
Kuschitische Königsstatuen im Vergleich
Creators: name: Wenig, Steffen
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 17 (2006): Der Antike Sudan
Spin-neutral currents for spintronics
Creators: name: Shao, Ding-Fu
name: Zhang, Shu-Hui
name: Li, Ming
name: Eom, Chang-Beom
name: Tsymbal, Evgeny Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Electric currents carrying a net spin polarization are widely used in spintronics, whereas globally spin-neutral currents are expected to play no role in spin-dependent phenomena. Here we show that, in contrast to this common expectation, spin-independent conductance in compensated antiferromagnets and normal metals can be efficiently exploited in spintronics, provided their magnetic space group symmetry supports a non-spin-degenerate Fermi surface. Due to their momentum-dependent spin polarization, such antiferromagnets can be used as active elements in antiferromagnetic tunnel junctions (AFMTJs) and produce a giant tunneling magnetoresistance (TMR) effect. Using RuO$_{2}$ as a representative compensated antiferromagnet exhibiting spin-independent conductance along the [001] direction but a non-spin-degenerate Fermi surface, we design a RuO$_{2}$/TiO$_{2}$/RuO$_{2}$ (001) AFMTJ, where a globally spin-neutral charge current is controlled by the relative orientation of the Néel vectors of the two RuO$_{2}$ electrodes, resulting in the TMR effect as large as ~500%. These results are expanded to normal metals which can be used as a counter electrode in AFMTJs with a single antiferromagnetic layer or other elements in spintronic devices. Our work uncovers an unexplored potential of the materials with no global spin polarization for utilizing them in spintronics.
Measurement of energy eigenstates by a slow detector
Creators: name: Martin, I.
name: Zurek, W. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a method for a weak continuous measurement of the energy eigenstates of a fast quantum system by means of a "slow" detector. Such a detector is only sensitive to slowly-changing variables, e. g. energy, while its back-action can be limited solely to decoherence of the eigenstate superpositions. We apply this scheme to the problem of detection of quantum jumps between energy eigenstates in a harmonic oscillator.
description: 4 pages
Neutralino Dark Matter in Mirage Mediation
Creators: name: Choi, K.
name: Kim, Y. G.
name: Lee, K. Y.
name: Okumura, K.
name: Shimizu, Y.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the phenomenology of neutralino dark matter (DM) in mirage mediation scenario of supersymmetry breaking which results from the moduli stabilization in some string/brane models. Depending upon the model parameters, especially the anomaly to modulus mediation ratio determined by the moduli stabilization mechanism, the nature of the lightest supersymmetric particle (LSP) changes from Bino-like neutralino to Higgsino-like one via Bino-Higgsino mixing region. For the Bino-like LSP, the standard thermal production mechanism can give a right amount of relic DM density through the stop/stau-neutralino coannihilation or the pseudo-scalar Higgs resonance process. We also examine the prospect of direct and indirect DM detection in various parameter regions of mirage mediation. Neutralino DM in galactic halo might be detected by near future direct detection experiments in the case of Bino-Higgsino mixed LSP. The gamma ray flux from Galactic Center might be detectable also if the DM density profile takes a cuspy shape.
description: One reference added
Correlation of coming limit price with order book in stock markets
Creators: name: Maskawa, Jun-ichi
Publisher: name: arXiv
Year: 2007
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: Statistical Finance (q-fin.ST)
subject: Trading and Market Microstructure (q-fin.TR)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: We examine the correlation of the limit price with the order book, when a limit order comes. We analyzed the Rebuild Order Book of Stock Exchange Electronic Trading Service, which is the centralized order book market of London Stock Exchange. As a result, the limit price is broadly distributed around the best price according to a power-law, and it isn't randomly drawn from the distribution, but has a strong correlation with the size of cumulative unexecuted limit orders on the price. It was also found that the limit price, on the coarse-grained price scale, tends to gather around the price which has a large size of cumulative unexecuted limit orders.
description: 8 pages, 7 figures
Modeling and stability analysis of structurally-varying dynamic systems with application to mechanical processing
Creators: name: Peng, Jie
Publisher: name: University of British Columbia
Year: 2008

description: With the ever-increasing sophistication of engineering practices, more time-variant and structurally-varying dynamic systems are required to accomplish various demanding tasks. The research on various aspects of the dynamics of these complex systems is therefore becoming increasingly active. The current project, which is the modeling and stability analysis of structurally-varying dynamic system, is initiated in such a context. A structurally-varying system is defined as a dynamic system that consists of a number of structural subsystems and are interconnected together through a finite set of constraints, which are time varying. The dynamics of the overall system depends on not only the dynamics of the subsystems but also the interconnections between them. The focus of this research is the stability analysis of linear, structurally-varying dynamic systems. Since the system has a time-varying structure, the stability condition of the system is generally changing with time (or more accurately with the constraints between subsystems). For different situations, test criteria for evaluating the stability of structurally-varying systems are developed. The relationship between the system stability and time-varying constraints is investigated. The relationship of the subsystem dynamics and the overall system dynamics is also studied. The main purposes of this study can be summarized as follows: first is to evaluate the stability of the system under certain constraints, and second is to deliberately change these constraints according to a set of desired criteria (such as change the constraints of the system in order to stabilize it) to maintain the system within a desired operating region, which may serve design and development purposes.
Effect of substrate-induced strain on transport and magnetic properties of epitaxial La_0.66Sr_0.33MnO_3 thin films
Creators: name: Dey, Puja
name: Nath, T. K.
name: Taraphder, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have studied electrical transport and magnetic properties of epitaxial La_0.66 Sr_0.33 Mn O_3 thin films grown on different substrates having different lattice strains induced by different film-substrate lattice-mismatch. Both electrical transport and magnetic properties exhibit strong correlation with Jahn-Teller strain. Our study shows a sufficiently large Jahn-Teller strain giving rise to distinct semi-conducting/insulating state in LSMO thin films even below the respective para-ferromagnetic Curie temperatutes Tc, which is in contradiction with the established phase diagram of Sr-doped manganites. We have presented a microscopic model for the analysis of our data instead of the usual expansion around the undistorted state generally in use in the literature. The model incorporates the two relevant e_g orbitals (and their ordering thereof) and the effect of both Jahn-Teller and bulk strain on the transition temperature via double exchange.
description: 14 pages with 03 figures
Kulturerhalt in Musawarat es Sufra
Creators: name: Scheibner, Thomas
name: Mucha, Rebekka
Publisher: name: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V.
Year: 2021

description: Der Antike Sudan. Mitteilungen der Sudanarchäologischen Gesellschaft zu Berlin e. V., Nr. 17 (2006): Der Antike Sudan
Choice of Parallelism: Multi-GPU Driven Pipeline for Huge Academic Backbone Network
Creators: name: Ando, Ruo
name: Kadobayashi, Youki
name: Takakura, Hiroki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Science Information Network (SINET) is a Japanese academic backbone network for more than 800 research institutions and universities. In this paper, we present a multi-GPU-driven pipeline for handling huge session data of SINET. Our pipeline consists of ELK stack, multi-GPU server, and Splunk. A multi-GPU server is responsible for two procedures: discrimination and histogramming. Discrimination is dividing session data into ingoing/outgoing with subnet mask calculation and network address matching. Histogramming is grouping ingoing/outgoing session data into bins with map-reduce. In our architecture, we use GPU for the acceleration of ingress/egress discrimination of session data. Also, we use a tiling design pattern for building a two-stage map-reduce of CPU and GPU. Our multi-GPU-driven pipeline has succeeded in processing huge workloads of about 1.2 to 1.6 billion session streams (500GB-650GB) within 24 hours.
description: This is an Accepted Manuscript of an article published by Taylor & Francis Group in the International Journal of Parallel, Emergent & Distributed Systems on 24/06/2021 av lable online: http://www.tandfonline.com/ DOI: 10.1080/17445760.2021.1941009
The Diverse Molecular Gas Content of Massive Galaxies Undergoing Quenching at z~1
Creators: name: Belli, Sirio
name: Contursi, Alessandra
name: Genzel, Reinhard
name: Tacconi, Linda J.
name: Förster-Schreiber, Natascha M.
name: Lutz, Dieter
name: Combes, Françoise
name: Neri, Roberto
name: García-Burillo, Santiago
name: Schuster, Karl F.
name: Herrera-Camus, Rodrigo
name: Tadaki, Ken-ichi
name: Davies, Rebecca L.
name: Davies, Richard I.
name: Johnson, Benjamin D.
name: Lee, Minju M.
name: Leja, Joel
name: Nelson, Erica J.
name: Price, Sedona H.
name: Shangguan, Jinyi
name: Shimizu, T. Taro
name: Tacchella, Sandro
name: Übler, Hannah
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a detailed study of the molecular gas content and stellar population properties of three massive galaxies at 1 < z < 1.3 that are in different stages of quenching. The galaxies were selected to have a quiescent optical/near-infrared spectral energy distribution and a relatively bright emission at 24 micron, and show remarkably diverse properties. CO emission from each of the three galaxies is detected in deep NOEMA observations, allowing us to derive molecular gas fractions Mgas/Mstar of 13-23%. We also reconstruct the star formation histories by fitting models to the observed photometry and optical spectroscopy, finding evidence for recent rejuvenation in one object, slow quenching in another, and rapid quenching in the third system. To better constrain the quenching mechanism we explore the depletion times for our sample and other similar samples at z~0.7 from the literature. We find that the depletion times are highly dependent on the method adopted to measure the star formation rate: using the UV+IR luminosity we obtain depletion times about 6 times shorter than those derived using dust-corrected [OII] emission. When adopting the star formation rates from spectral fitting, which are arguably more robust, we find that recently quenched galaxies and star-forming galaxies have similar depletion times, while older quiescent systems have longer depletion times. These results offer new, important constraints for physical models of galaxy quenching.
description: 9 pages, 4 figures. Accepted for publication in ApJ Letters
The effective Coulomb potential in SU(3) lattice Yang-Mills theory
Creators: name: Voigt, A.
name: Ilgenfritz, E. -M.
name: Müller-Preussker, M.
name: Sternbeck, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the infrared behavior of the effective Coulomb potential in lattice SU(3) Yang-Mills theory in the Coulomb gauge. We use lattices up to a size of 48^4 and three values of the inverse coupling, beta=5.8, 6.0 and 6.2. While finite-volume effects are hardly visible in the effective Coulomb potential, scaling violations and a strong dependence on the choice of Gribov copy are observed. We obtain bounds for the Coulomb string tension that are in agreement with Zwanziger's inequality relating the Coulomb string tension to the Wilson string tension.
description: 11 pages, 6 figures; more thorough discussion of the remaining Gribov ambiguity of the infrared behavior of the Coulomb potential added, bounds for the Coulomb string tension given, Figures completed, version to appear in Phys. Rev. D
Constraining red supergiant mass-loss prescriptions through supernova radio properties
Creators: name: Moriya, Takashi J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Supernova properties in radio strongly depend on their circumstellar environment and they are an important probe to investigate the mass loss of supernova progenitors. Recently, core-collapse supernova observations in radio have been assembled and the rise time and peak luminosity distribution of core-collapse supernovae at 8.4 GHz has been estimated. In this paper, we constrain the mass-loss prescriptions for red supergiants by using the rise time and peak luminosity distribution of Type II supernovae in radio. We take the de Jager and van Loon mass-loss rates for red supergiants, calculate the rise time and peak luminosity distribution based on them, and compare the results with the observed distribution. We found that the de Jager mass-loss rate explains the widely spread radio rise time and peak luminosity distribution of Type II supernovae well, while the van Loon mass-loss rate predicts a relatively narrow range for the rise time and peak luminosity. We conclude that the mass-loss prescriptions of red supergiants should have strong dependence on the luminosity as in the de Jager mass-loss rate to reproduce the widely spread distribution of the rise time and peak luminosity in radio observed in Type II supernovae.
description: 5 pages, 6 figures, accepted by Monthly Notices of the Royal Astronomical Society Letters
Clustering of i-dropout galaxies at z=6 in GOODS and the UDF
Creators: name: Overzier, Roderik A.
name: Bouwens, Rychard J.
name: Illingworth, Garth D.
name: Franx, Marijn
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We measured the angular clustering at z~6 from a large sample of i-dropout galaxies (293 with z<27.5 from GOODS and 95 with z<29.0 from the UDF). Our largest and most complete subsample (having L>0.5L*) shows the presence of clustering at 94% significance. For this sample we derive a (co-moving) correlation length of r_0=4.5^{+2.1}_{-3.2} h_{72}^{-1} Mpc and bias b=4.1^{+1.5}_{-2.6}, using an accurate model for the redshift distribution. No clustering could be detected in the much deeper but significantly smaller UDF, yielding b<4.4 (1 sigma). We compare our findings to Lyman break galaxies at z=3-5 at a fixed luminosity. Our best estimate of the bias parameter implies that i-dropouts are hosted by dark matter halos having masses of ~10^11 M_sun, similar to that of V-dropouts at z~5. We evaluate a recent claim that at z>5 star formation might have occurred more efficiently compared to that at z=3-4. This may provide an explanation for the very mild evolution observed in the UV luminosity density between z=6 and z=3. Although our results are consistent with such a scenario, the errors are too large to find conclusive evidence for this.
description: minor changes to match published version
Thermo-mechanical modelling of hot flat-rolling of components with curved profiles
Creators: name: Xiao, Ming
Publisher: name: University of British Columbia
Year: 2008

description: A complete mathematical model for implementing the VGR process (a flat rolling process for producing components with variable thickness) under hot working conditions has been established. The work is based on an idea that a combination of separate submodels, such as, deformation, flow stress, roll force, temperature, etc., should be used, so that new development in each of these areas can be easily incorporated. A deformation submodel, based on the upper bound theorem, is given for the analysis of three-dimensional deformation of the work piece. A simple velocity field is proposed. To preserve the theoretical consistency, an equivalent coefficient of friction is adopted for the roll force calculation. Furthermore, the basic assumption, i.e., the rigid perfectly-plastic material assumption, is modified by introducing a concept of an isotropic rate-dependent material. Satisfactory results were obtained in spread, torque and force prediction. To obtain the mean temperature of the work piece, a temperature submodel is formulated based on one-dimensional transient flow in the roll-bite and two-dimensional flow outside the roll-bite. The model is capable of predicting the through-thickness temperature distribution in the roll-bite, estimating the mean temperature of the deforming body, and roughly calculating the mean temperature distribution along the work piece. To characterize the high temperature behaviour of steels, the well-known unified creep relationship is chosen as the flow stress submodel. Reasonably accurate prediction of the flow stress is achieved by using some experimental data reported in the literature.