cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Simulation and adaptive control for valve friction problems in a paper mill
Creators: name: Bergstrom, Jan A.
Publisher: name: University of British Columbia
Year: 2009

description: This thesis attempts to address issues of poor performance in a paper mill. It looks at two specific issues; the need to perform offline performance evaluations using simulation tools, and the specific problems associated with friction in control valves. The first issue is addressed through the development of an object oriented component library for the dynamic simulation of complex systems in the mill. Modelling of a paper machine approach system is used as the basis for developing a structure that could later be expanded to include blocks for simulation of all parts of the paper mill. The simulation is used to identify potential problems, and to evaluate some possible solutions. It is also used to evaluate the effects on the final product of valve friction in a particular control loop. The second issue involves the oscillatory behaviour generated when a valve with fiction is placed under conventional automatic control. The nature of friction and its effects on a typical pneumatic valve are analysed. Various macroscopic friction characteristics are used to create an adaptive control algorithm that can be used on the valve without a requirement for high-bandwidth control. The strategy is tested on a simulation of a pneumatic valve with friction and compared to conventional PI control.
Metallicity and X-ray luminosity variations in NGC 922
Creators: name: Kouroumpatzakis, Konstantinos
name: Zezas, Andreas
name: Wolter, Anna
name: Fruscione, Antonella
name: Anastasopoulou, Konstantina
name: Prestwich, Andrea
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a systematic study of the metallicity variations within the collisional ring galaxy NGC 922 based on long-slit optical spectroscopic observations. We find a metallicity difference between star-forming regions in the bulge and the ring, with metallicities ranging from almost solar to significantly sub-solar ($\rm{[12+\log(O/H)]\sim 8.2}$). We detect $\rm He\,_I$ emission in the bulge and the ring star-forming regions indicating ionization from massive stars associated with recent ($<10$ Myr) star-formation, in agreement with the presence of very young star-clusters in all studied regions. We find an anti-correlation between the X-ray luminosity and metallicity of the sub-galactic regions of NGC 922. The different regions have similar stellar population ages leaving metallicity as the main driver of the anti-correlation. The dependence of the X-ray emission of the different regions in NGC 922 on metallicity is in agreement with similar studies of the integrated X-ray output of galaxies and predictions from X-ray binary population models.
description: 15 pages, 10 figures
Comments on the electromagnetic decay of $Λ(1520)$
Creators: name: Myhrer, F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The electromagnetic decay processes of excited hyperon states are a very sensitive probe of the structure of hyperons. We will argue that the recent measurements of electromagnetic decay rates indicate that the wave functions of the hyperon ground states should contain sizeable components of excited quark states (configuration mixing). Flavor-SU(3) is a broken symmetry and it appears that the hyperon wave functions should preferably be written in a $uds$-basis, where only the light $u$ and $d$ quarks are symmetrized, and not in the usual SU(6)-basis.
description: 8 pages
Small Data, Big Decisions: Model Selection in the Small-Data Regime
Creators: name: Bornschein, Jorg
name: Visin, Francesco
name: Osindero, Simon
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Highly overparametrized neural networks can display curiously strong generalization performance - a phenomenon that has recently garnered a wealth of theoretical and empirical research in order to better understand it. In contrast to most previous work, which typically considers the performance as a function of the model size, in this paper we empirically study the generalization performance as the size of the training set varies over multiple orders of magnitude. These systematic experiments lead to some interesting and potentially very useful observations; perhaps most notably that training on smaller subsets of the data can lead to more reliable model selection decisions whilst simultaneously enjoying smaller computational costs. Our experiments furthermore allow us to estimate Minimum Description Lengths for common datasets given modern neural network architectures, thereby paving the way for principled model selection taking into account Occams-razor.
QCD traveling waves beyond leading logarithms
Creators: name: Peschanski, R.
name: Sapeta, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We derive the asymptotic traveling-wave solutions of the nonlinear 1-dimensional Balitsky-Kovchegov QCD equation for rapidity evolution in momentum-space, with 1-loop running coupling constant and equipped with the Balitsky-Kovchegov-Kuraev-Lipatov kernel at next-to-leading logarithmic accuracy, conveniently regularized by different resummation schemes. Traveling waves allow to define "universality classes" of asymptotic solutions, i.e. independent of initial conditions and of the nonlinear damping. A dependence on the resummation scheme remains, which is analyzed in terms of geometric scaling properties.
description: 10 pages, 5 figures; typos corrected, references updated, final Phys.Rev. D version
Fractional flux quanta at intrinsic metallic interfaces of noncentrosymmetric superconductors
Creators: name: Iniotakis, C.
name: Fujimoto, S.
name: Sigrist, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We examine intrinsic interfaces separating crystalline twin domains of opposite spin-orbit coupling in a noncentrosymmetric superconductor such as CePt3Si. At these interfaces, low-energy Andreev bound states occur as a consequence of parity-mixed Cooper pairing, and a superconducting phase which violates time reversal symmetry can be realized. This provides an environment allowing flux lines with fractional flux quanta to be formed at the interface. Their presence could have strong implications on the flux creep behavior in such superconductors.
description: 4 pages, 3 figures
Introduction of Sr into Bi2Se3 thin films by molecular beam epitaxy
Creators: name: Riney, L.
name: Bunker, C.
name: Bac, S. -K.
name: Wang, J.
name: Battaglia, D.
name: Park, Yun Chang
name: Dobrowolska, M.
name: Furdyna, J. K.
name: Liu, X.
name: Assaf, B. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: SrxBi2Se3 is a candidate topological superconductor but its superconductivity requires the intercalation of Sr by into the van-der-Waals gaps of Bi2Se3. We report the synthesis of SrxBi2Se3 thin films by molecular beam epitaxy, and we characterize their structural, vibrational and electrical properties. X-ray diffraction and Raman spectroscopy show evidence of substitutional Sr alloying into the structure, while transport measurements allow us to correlate the increasing Sr content with an increased n-type doping, but do not reveal superconductivity down to 1.5K. Our results suggest that Sr predominantly occupies sites within a quintuple layer, simultaneously substituting for Bi and as an interstitial. Our results motivate future density functional studies to further investigate the energetics of Sr substitution into Bi2Se3.
Expression of Ets transcription factors Etv1, Etv4 in mouse testis
Creators: name: Zhang, Xue-Ming
name: Si, Lei
name: Liu, Yang
name: Tang, Bo
name: Li, Zi-Yi
Publisher: name: F1000Research
Year: 2015

description: Ets related molecule (ERM, Etv5) was reported as a key molecule for the maintenance of spermatogonial stem cell niches recently. Since Etv5, Etv4 and Etv1 belong to the same subfamily of Ets family and share highly conserved homologous domain, here we focused on whether Etv4 and Etv1 were expressed in mouse testis. The mRNA expression levels of Etv4, Etv1 and Etv5 at different developmental stages of mouse testis were examined. Postnatal 5-day, 7-week, 16-week and 10-month were selected as the representative developmental stages for puberty, sexual maturity, adulthood and old age, respectively. The results showed that the expression of Etv5 mRNA was lower at 5-day, extremely increased at 7-week (P<0.001), then significantly decreased at 16-week and 10-month (P<0.01). Etv1 mRNA was at the same level with that of Etv5 at 5-day, increased significantly at 7-week (P<0.05), decreased slightly at 16-week and then increased evidently at 10-month. Etv4 was very lower at all four time points compared with that of Etv5 and Etv1. However, it also increased significantly at 7-week and decreased afterwards. The present results indicate that expression of Etv5 and Etv1 in testis reaches peak along with the sexual maturity, and then decreases and maintains at a relatively high level during the spermatogenesis, which putatively suggests Etv1 may has functions in mouse spermatognesis. However, the exact roles of Etv1 on SSCs self-renewal and differentiation still need to be addressed in next step.
Asymmetric matter-wave solitons at nonlinear interfaces
Creators: name: Ye, Fangwei
name: Kartashov, Yaroslav V.
name: Torner, Lluis
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We predict the existence and study the basic properties of strongly asymmetric matter wave solitons that form at the interface produced by regions with different inter-atomic interaction strengths in pancake Bose-Einstein condensates. We address several types of surface solitons featuring topologically complex structures, including vortex and dipole-mode solitons. We found that the soliton become significantly asymmetric for high number of particles in the condensate. Yet, we reveal that under suitable conditions, that we elucidate, even such strongly asymmetric dipole and vortex solitons can be dynamically stable over wide regions of their existence domains.
description: 18 pages, 6 figures, to appear in Physical Review A
Raiser, Konrad: Ernstfall des Glaubens
Creators: name: Dahling-Sander, Christoph
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 49 Nr. 1 (2000): Ökumenische Rundschau, Band 49, Heft 1
Solar system tests of brane world models
Creators: name: Boehmer, Christian G.
name: Harko, Tiberiu
name: Lobo, Francisco S. N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The classical tests of general relativity (perihelion precession, deflection of light, and the radar echo delay) are considered for the Dadhich, Maartens, Papadopoulos and Rezania (DMPR) solution of the spherically symmetric static vacuum field equations in brane world models. For this solution the metric in the vacuum exterior to a brane world star is similar to the Reissner-Nordstrom form of classical general relativity, with the role of the charge played by the tidal effects arising from projections of the fifth dimension. The existing observational solar system data on the perihelion shift of Mercury, on the light bending around the Sun (obtained using long-baseline radio interferometry), and ranging to Mars using the Viking lander, constrain the numerical values of the bulk tidal parameter and of the brane tension.
description: 14 pages, to appear in Classical and Quantum Gravity. V2, minor corrections and references added
2.16_Fischer: On interactions of drive trains in wind farms providing power system inertia
Creators: name: Fischer, Boris
name: Duckwitz, Daniel
name: Shan, Martin
name: Sayed, Mohamed
name: Rezaeian, Alireza
Publisher: name: Zenodo
Year: 2019

description: With an increasing share of inverter-based generating units power system inertia and its stabilizing effect is reduced. In principle, wind turbines can contribute to system inertia by using their rotor as a short-term energy storage. Several control-based solutions are currently being discussed to provide emulated inertia with wind turbines. These solutions cause a dynamic coupling of the turbine’s structure with the electrical side. On one hand, this coupling is precisely intended for providing power system inertia. On the other hand, the coupling induces additional loads on the drive train, which must be kept to a minimum by carefully designing the inertia control schemes.
X-ray tomography investigation of cyclically sheared granular materials
Creators: name: Xing, Yi
name: Zheng, Jie
name: Li, Jindong
name: Cao, Yixin
name: Pan, Wei
name: Zhang, Jie
name: Wang, Yujie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We perform combined X-ray tomography and shear force measurements on a cyclically sheared granular system with highly transient behaviors, and obtain the evolution of microscopic structures and the macroscopic shear force during the shear cycle. We explain the macroscopic behaviors of the system based on microscopic processes, including the particle level structural rearrangement and frictional contact variation. Specifically, we show how contact friction can induce large structural fluctuations and cause significant shear dilatancy effect for granular materials, and we also construct an empirical constitutive relationship for the macroscopic shear force.
description: 26 pages, 4 figures
Programmable unknown quantum-state discriminators with multiple copies of program and data: A Jordan basis approach
Creators: name: He, Bing
name: Bergou, János A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The discrimination of any pair of unknown quantum states is performed by devices processing three parts of inputs: copies of the pair of unknown states we want to discriminate are respectively stored in two program systems and copies of data, which is guaranteed to be one of the unknown states, in a third system. We study the efficiency of such programmable devices with the inputs prepared with $n$ and $m$ copies of unknown qubits used as programs and data, respectively. By finding a symmetry in the average inputs, we apply the Jordan basis method to derive their optimal unambiguous discrimination and the minimum-error discrimination schemes. The dependence of the optimal solutions on the a prior probabilities of the mean input states is also demonstrated.
description: 12 pages in revtex4
Partial Automorphisms and Injective Partial Endomorphisms of a Finite Undirected Path
Creators: name: Dimitrova, Ilinka
name: Fernandes, Vítor H.
name: Koppitz, Jörg
name: Quinteiro, Teresa M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 05C38, 20M10, 20M20, 05C25

description: In this paper, we study partial automorphisms and, more generally, injective partial endomorphisms of a finite undirected path from Semigroup Theory perspective. Our main objective is to give formulas for the ranks of the monoids $IEnd(P_n)$ and $PAut(P_n)$ of all injective partial endomorphisms and of all partial automorphisms of the undirected path $P_n$ with $n$ vertices. We also describe Green's relations of $PAut(P_n)$ and $IEnd(P_n)$ and calculate their cardinals.
Quasibound states of charged dilatonic black holes
Creators: name: Huang, Yang
name: Zhang, Hongsheng
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Investigation of quasibound states of black holes is significant for expected ultra light particles, as well as black holes through gravitational waves. We first investigate quasibound states of a massive scalar field for dilatonic charged black holes via numerical analysis. We study the complex eigen frequencies of the massive scalar field in a wide range of gravitational fine structure constant $μM$ in detail, and show the effects of charge. Further, we study the eigen frequencies of the massive field through analytical approach by matching the near horizon solution and far field solution, and find its spectra for excited states by iteration method. We demonstrate the numerical solution and analytical solution perfectly agree with each other in the region where charge of the black hole is large, both for real and imaginary parts of the eigen frequencies.
description: 9 pages, 17 figures
Fragility and elastic behavior of a supercooled liquid
Creators: name: Priya, Madhu
name: Das, Shankar P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A model for the supercooled liquid is considered by taking into account its solid like properties. We focus on how the long time dynamics is affected due to the coupling between the slowly decaying density fluctuations and the local displacement variables in the frozen liquid. Results from our model agree with the recent observation of Novikov and Sokolov [Nature (London) {\bf 431}, 961 (2004)] that the fragility index $m$ of a glass forming material is linearly related to the corresponding ratio $K/G$ of the bulk and the shear moduli.
description: 20 pages, 9 figures (.eps)
Dressed matter waves
Creators: name: Eckardt, Andre
name: Holthaus, Martin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We suggest to view ultracold atoms in a time-periodically shifted optical lattice as a "dressed matter wave", analogous to a dressed atom in an electromagnetic field. A possible effect lending support to this concept is a transition of ultracold bosonic atoms from a superfluid to a Mott-insulating state in response to appropriate "dressing" achieved through time-periodic lattice modulation. In order to observe this effect in a laboratory experiment, one has to identify conditions allowing for effectively adiabatic motion of a many-body Floquet state.
description: 9 pages, 4 figures, to be published in: J. Phys.: Conference Series
Monitoring polarization in comet 46P/Wirtanen
Creators: name: Zheltobryukhov, M.
name: Zubko, E.
name: Chornaya, E.
name: Luk'yanyk, I.
name: Ivanova, O.
name: Kochergin, A.
name: Kornienko, G.
name: Mkrtichian, D.
name: Poshyachinda, S.
name: Molotov, I. E.
name: Kim, S. S.
name: Videen, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We measure the degree of linear polarization of comet 46P/Wirtanen during two months, embracing the perihelion passage in 2018 December with phase angles ranging from α=18.1 to 46.4 deg. The polarimetric response PQ obtained resembles what was previously found in comet C/1975 V1 (West). This suggests 46P/Wirtanen belongs to a group of comets with high maximum positive polarization. We conducted BVRI photometry of 46P and found either neutral or blue colour of its dust which is in good accordance with measurements of C/1975 V1 (West). While aperture-average polarimetry of 46P/Wirtanen reveals a nearly zero polarization PQ at the lowest phase angle α = 18.1 deg, simultaneous imaging polarimetry suggests that the negative polarization (PQ<0) arises in a region of within 5000 km of the nucleus, where the negative polarization could be as strong as PQ=-(1.44 +/- 0.15) percent. This observation suggests the existence of the circumnucleus halo and that the coma is populated by at least two types of dust particles. One of those reveals a low positive polarization at side scattering and high negative polarization near backscattering. Both polarimetric features are simultaneously produced by weakly absorbing Mg-rich silicate particles. Another type of dust produces solely positive polarization that could be attributed to carbonaceous particles. This composition of 46P/Wirtanen coma appears to be similar with what was previously found in comet C/1975 V1 (West).
description: 12 pages, 5 figures
Knowledge sharing through WhatsApp: does it promote EFL teachers’ reflective practice?
Creators: name: Farahian, Majid
name: Parhamnia, Farshad
Publisher: name: figshare
Year: 2021
Subjects: subject: 200303 English as a Second Language
subject: FOS: Languages and literature

description: Reflective practice can greatly improve teachers ’ professional development, and various studies have demonstrated that teachers ’ knowledge sharing has a positive impact on their reflection. Accordingly, the present study was conducted to examine the effect of knowledge sharing in a popular online forum –WhatsApp – on English as foreign language (EFL) teachers ’ reflective practice. It was also aimed to probethe challenges the teachers faced to share information in their daily practice.
title: Μελέτη τεχνικών ταρίχευσης, παθολογίας και συντήρησης ταριχευμένου ψαριού Piranha από το Ζωολογικό Μουσείο του ΕΚΠΑ.
title: Study of the taxidermy techniques, pathology and conservation of a taxidermied Piranha fish from the Zoological Museum of the National and Kapodistrian University of Athens.
titleType: AlternativeTitle
Creators: name: Μεντζίνη, Ιωάννα
name: Τσαμποδήμου, Δήμητρα
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2023
Subjects: Ταρίχευση
Μουμιοποίηση
Μουσεία Ζωολογίας
Piranha
Διατήρηση σε υγρά μέσα
Ακτινογραφία
Φασματοσκοπία υπερύθρου μετασχηματισμού Fourier
FTIR
Ηλεκτρονικό μικροσκόπιο σάρωσης
SEM
Προληπτική και επεμβατική συντήρηση
Κώδικας δεοντολογίας
Δεοντολογία συντήρησης
Taxidermy
Mummification
Zoology museums
Wet preservation
X-ray radiography
Fourier Transform Infared Spectroscopy
Scanning Electron Microscopy
Preventative and interventional conservation
Conservation ethics

description: Η παρούσα πτυχιακή εργασία επικεντρώνεται στην μελέτη τεχνικών ταρίχευσης, παθολογίας και συντήρησης ενός μουμιοποιημένου ψαριού Piranha που ανήκει στο Ζωολογικό Μουσείο του ΕΚΠΑ. Στο πρώτο μέρος της εργασίας παρουσιάζεται βιβλιογραφική έρευνα σχετικά με τα μουσεία φυσικής ιστορίας καθώς και ειδικότερα για το Μουσείο Ζωολογίας του Πανεπιστημίου Αθηνών. Ακολουθεί παρουσίαση και ανάλυση των τριών μεθόδων κατεργασίας: ταρίχευση, μουμιοποίηση και διατήρηση σε υγρά μέσα. Έπειτα καταγράφονται οι κίνδυνοι και οι φθορές των ταριχευμένων σπονδυλόζωων, καθώς και οι κίνδυνοι που μπορεί να επιφέρουν στον άνθρωπο ως συνέπεια της χρήσης τοξικών υλικών. Τέλος, θίγονται ζητήματα προληπτικής και επεμβατικής συντήρησης καθώς και θέματα ηθικής σχετικά με τα αντικείμενα φυσικής ιστορίας. Στο δεύτερο μέρος της εργασίας τίθεται το ερώτημα των μεθόδων διατήρησης που χρησιμοποιήθηκαν. Ώστε να απαντηθεί το κύριο ερώτημα, πραγματοποιήθηκε μια σειρά αναλύσεων. Αρχικά πραγματοποιήθηκε ακτινογραφία ακτίνων Χ όπου διαπιστώθηκε η ύπαρξη της σκελετικής δομής και των μυών, κάτι που οδήγησε στην αμφισβήτηση της ταρίχευσης ως της παρούσας μεθόδου διατήρησης. Οι αναλύσεις συνεχίστηκαν με φασματοσκοπία υπερύθρων μετασχηματισμού Fourier, με ηλεκτρονικό μικροσκόπιο σάρωσης και με δοκιμές καθαρισμού. Τα αποτελέσματα των παραπάνω αναλύσεων οδήγησαν στο συμπέρασμα ότι η μέθοδος διατήρησης που υπέστη το αντικείμενο, δεν είναι η ταρίχευση αλλά πρόκειται για μέθοδο μουμιοποίησης. Τέλος, γίνεται πρόταση τρόπου έκθεσης του αντικειμένου σε μουσειακό χώρο.
Stress-free BCS pairing in color superconductors is impossible
Creators: name: Rajagopal, Krishna
name: Schmitt, Andreas
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Cold, asymptotically dense three-flavor quark matter is in the color-flavor locked (CFL) phase, in which all quarks pair in a particularly symmetric fashion. At smaller densities, taking into account a nonzero strange quark mass and electric and color neutrality, the CFL phase requires pairing of quarks with mismatched Fermi momenta. We present a classification of all other possible, less symmetric, pairing patterns and prove that none of them can avoid this mismatch. This result suggests unconventional, e.g., spatially inhomogeneous, superconducting phases for moderate densities.
description: 3 pages, to appear in the proceedings of "Quark Confinement and the Hadron Spectrum VII", Ponta Delgada, Azores (Portugal), Sept 2 - 7, 2006
Microscopic calculation and LDA of the spatial dependence of the pairing field with bare and induced interactions
Creators: name: Pastore, A.
name: Barranco, F.
name: Broglia, R. A.
name: Vigezzi, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The bare nucleon-nucleon interaction is essential for the production of pair correlations in nuclei, but an important contribution also arises from the induced interaction resulting from the exchange of collective vibrations between nucleons moving in time reversal states close to the Fermi energy. The pairing field resulting from the summed interaction is strongly peaked at the nuclear surface. It is possible to reproduce the detailed spatial dependence of this field using a Local Density Approximation (LDA) and a contact interaction, with parameters which are quite different from those commonly used in more phenomenological approaches.
Pure spin current and negative differential electric resistance in hybrid systems
Creators: name: Gholami, Zainab
name: Khoeini, Farhad
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: This paper aims to investigate the spin dependent transport properties in hybrid nanoribbons, using the non equilibrium Greens function method. The effects of temperature gradient between the left and right leads, the ferromagnetic exchange field, and the local external electric fields are also included. The results show that the spin up and spin down currents are produced and flow in opposite directions with almost equal magnitudes. This evidently shows that the carrier transport is dominated by the thermal spin current. Whereas the thermal electron current is almost disappeared.
description: 26 pages
Kinetic proofreading of gene activation by chromatin remodeling
Creators: name: Blossey, Ralf
name: Schiessel, Helmut
Publisher: name: arXiv
Year: 2008
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences

description: Gene activation in eukaryotes involves the concerted action of histone tail modifiers, chromatin remodellers and transcription factors, whose precise coordination is currently unknown. We demonstrate that the experimentally observed interactions of the molecules are in accord with a kinetic proofreading scheme. Our finding could provide a basis for the development of quantitative models for gene regulation in eukaryotes based on the combinatorical interactions of chromatin modifiers.
description: 8 pages, 2 Figures; application added
A citizens' jury on euthanasia/assisted dying: Does informed deliberation change people's views?
Creators: name: Walker, S
name: Egan, R
name: Young, Jessica
name: Jaye, C
name: Jackson, C
Publisher: name: Open Access Victoria University of Wellington | Te Herenga Waka
Year: 2021
Subjects: subject: 111799 Public Health and Health Services not elsewhere classified
subject: FOS: Health sciences
subject: 111099 Nursing not elsewhere classified
subject: 170199 Psychology not elsewhere classified
subject: FOS: Psychology

description: Euthanasia or assisted dying (EAD) remains a highly contentious issue internationally. Although polls report that a majority New Zealanders support EAD, there are concerns about the framing of the polling questions, and that those responding to the questions do not know enough about the situations described, the options available and the potential implications of EAD policy. One way to address these concerns is through a citizens' jury, which is a method of learning how a group of people view an issue following informed deliberation. This citizens' jury was conducted to learn whether a group of 15 New Zealanders thought the law should be changed to allow some form of EAD and the reasons for their view, having been informed about the issue, heard arguments for and against, and having deliberated together. The jury met for two and a half days. They did not reach a consensus, but become polarized in their positions, with several changing their positions to either strong opposition or strong support. The reasons why people support or oppose EAD were not reducible to particular principles or arguments, but reflected an integrated assessment of a range of considerations, informed by personal priorities and experiences. These results suggest that views on EAD may change in response to informed deliberation that the EAD debate involves a range of value judgments and is not likely to be resolved through deliberation alone. These results may inform international debate on EAD policy.
Battery-constrained Federated Edge Learning in UAV-enabled IoT for B5G/6G Networks
Creators: name: Tang, Shunpu
name: Zhou, Wenqi
name: Chen, Lunyuan
name: Lai, Lijia
name: Xia, Junjuan
name: Fan, Liseng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: In this paper, we study how to optimize the federated edge learning (FEEL) in UAV-enabled Internet of things (IoT) for B5G/6G networks, from a deep reinforcement learning (DRL) approach. The federated learning is an effective framework to train a shared model between decentralized edge devices or servers without exchanging raw data, which can help protect data privacy. In UAV-enabled IoT networks, latency and energy consumption are two important metrics limiting the performance of FEEL. Although most of existing works have studied how to reduce the latency and improve the energy efficiency, few works have investigated the impact of limited batteries at the devices on the FEEL. Motivated by this, we study the battery-constrained FEEL, where the UAVs can adjust their operating CPU-frequency to prolong the battery life and avoid withdrawing from federated learning training untimely. We optimize the system by jointly allocating the computational resource and wireless bandwidth in time-varying environments. To solve this optimization problem, we employ a deep deterministic policy gradient (DDPG) based strategy, where a linear combination of latency and energy consumption is used to evaluate the system cost. Simulation results are finally demonstrated to show that the proposed strategy outperforms the conventional ones. In particular, it enables all the devices to complete all rounds of FEEL with limited batteries and meanwhile reduce the system cost effectively.
Measurements of psi(2S) decays to octet baryon-antibaryon pairs
Creators: name: The BES Collaboration
name: Ablikim, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: With a sample of 14 million psi(2S) events collected by the BESII detector at the Beijing Electron Positron Collider (BEPC), the decay channels psi(2S)->p p-bar, Lambda Lambda-bar, Sigma0 Sigma0-bar, Xi Xi-bar are measured, and their branching ratios are determined to be (3.36+-0.09+-0.24)*10E-4, (3.39+-0.20+-0.32)*10E-4, (2.35+-0.36+-0.32)*10E-4, (3.03+-0.40+-0.32)*10E-4, respectively. In the decay psi(2S)->p p-bar, the angular distribution parameter alpha is determined to be 0.82+-0.17+-0.04.
description: 8 pages, 8 figures
Social distancing in pedestrian dynamics and its effect on disease spreading
Creators: name: Sajjadi, Sina
name: Hashemi, Alireza
name: Ghanbarnejad, Fakhteh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Non-pharmaceutical measures such as social distancing, can play an important role to control an epidemic in the absence of vaccinations. In this paper, we study the impact of social distancing on epidemics for which it is executable. We use a mathematical model combining human mobility and disease spreading. For the mobility dynamics, we design an agent based model consisting of pedestrian dynamics with a novel type of force to resemble social distancing in crowded sites. For the spreading dynamics, we consider the compartmental SIE dynamics plus an indirect transmission with the footprints of the infectious pedestrians being the contagion factor. We show that the increase in the intensity of social distancing has a significant effect on the exposure risk. By classifying the population into social distancing abiders and non-abiders, we conclude that the practice of social distancing, even by a minority of potentially infectious agents, results in a drastic change on the population exposure risk, but reduces the effectiveness of the protocols when practiced by the rest of the population. Furthermore, we observe that for contagions which the indirect transmission is more significant, the effectiveness of social distancing would be reduced. This study can provide a quantitative guideline for policy-making on exposure risk reduction.
Stability of the homogeneous Bose-Einstein condensate at large gas parameter
Creators: name: Rakhimov, Abdulla
name: Kim, Chul Koo
name: Kim, Sang-Hoon
name: Yee, Jae Hyung
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Nuclear Theory (nucl-th)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The properties of the uniform Bose gas is studied within the optimized variational perturbation theory (Gaussian approximation) in a self-consistent way. It is shown that the atomic BEC with a repulsive interaction becomes unstable when the gas parameter gamma=rho a^3 exceeds a critical value gamma_{crit} ~ 0.01. The quantum corrections beyond the Bogoliubov-Popov approximation to the energy density, chemical potential and pressure in powers of gamma expansions are presented.
description: 9 pages, 3 figures, Revtex
Risis Core Facility - Building an infrastructure integrating data and services for the humanities
Creators: name: Breucker, Philippe
Publisher: name: Zenodo
Year: 2022
Subjects: RISIS Core Facility
RISIS
e-infrastructure
datastore
data analysis
EERAData

description: Risis Core Facility - Building an infrastructure integrating data and services for the humanities Presentation of the Risis Core Facility in the EERAData project workshop n°4, Vienna, Austria, on March 17th 2022. The presentation describe the RISIS project, and its platform the Risis Core Facility, its goals and architecture as well as different notions that it's build uppon (scenario language RSML, datastore, user workspace).
Coarse-to-Fine Object Tracking Using Deep Features and Correlation Filters
Creators: name: Zgaren, Ahmed
name: Bouachir, Wassim
name: Ksantini, Riadh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: During the last years, deep learning trackers achieved stimulating results while bringing interesting ideas to solve the tracking problem. This progress is mainly due to the use of learned deep features obtained by training deep convolutional neural networks (CNNs) on large image databases. But since CNNs were originally developed for image classification, appearance modeling provided by their deep layers might be not enough discriminative for the tracking task. In fact,such features represent high-level information, that is more related to object category than to a specific instance of the object. Motivated by this observation, and by the fact that discriminative correlation filters(DCFs) may provide a complimentary low-level information, we presenta novel tracking algorithm taking advantage of both approaches. We formulate the tracking task as a two-stage procedure. First, we exploit the generalization ability of deep features to coarsely estimate target translation, while ensuring invariance to appearance change. Then, we capitalize on the discriminative power of correlation filters to precisely localize the tracked object. Furthermore, we designed an update control mechanism to learn appearance change while avoiding model drift. We evaluated the proposed tracker on object tracking benchmarks. Experimental results show the robustness of our algorithm, which performs favorably against CNN and DCF-based trackers. Code is available at: https://github.com/AhmedZgaren/Coarse-to-fine-Tracker
Root, Michael, Saarinen, Risto: Baptism and the unity of church
Creators: name: Gassmann, Günther
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 49 Nr. 1 (2000): Ökumenische Rundschau, Band 49, Heft 1
Time dependent density functional theory calculation of van der Waals coefficient C$_{6}$ of alkali-metal atoms Li, Na, K, alkali dimers Li$_{2}$, Na$_{2}$, K$_{2}$ and sodium clusters Na$_{n}$
Creators: name: Banerjee, Arup
name: Autschbach, Jochen
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: In this paper we employ all-electron time dependent density functional theory (TDDFT) to calculate the long range dipole-dipole dispersion coefficient (van der Waals coefficient) $C_{6}$ of alkali-metal atoms Li, Na, K, alkali-metal atom dimers Li$_{2}$, Na$_{2}$, K$_{2}$ and sodium clusters containing even number of atoms ranging from 2 to 20 atoms. The dispersion coefficients are obtained via Casimir-Polder expression which relates it to the frequency dependent linear polarizabilty at imaginary frequencies. The frequency dependent polarizabilities are calculated by employing TDDFT--based complete sum-over-states expressions for the atoms, and direct TDDFT linear response theory for the closed shell dimers and clusters.
description: 14 pages of text and 4 figures
The analysis of wet snow effects on earth-space transmission systems
Creators: name: Hulays, Rafeh Ahmad
Publisher: name: University of British Columbia
Year: 2009

description: In this thesis, the effect of precipitation, including the melting layer, on wireless communication systems is examined. A melting layer model is developed which is based upon the most reliable data, available from radar and direct observations. The dominant factor in determining the level of reflectivity and attenuation in the melting layer is found to be the initial-snow density; its average and bounding limits are derived in this work. Several meteorological models (Awaka, Capsoni and ITIJ-R models) are used to develop interference models. These models are modified to include the effect of the melting layer. The results show that while the melting layer can on occasion affect interference, its role overall is small and offers little improvement in interference prediction. A notable exception is at the lower frequencies (f = 4 GHz) where melting layer enhancement of interference is quite noticeable. It is also concluded that it is unlikely the melting layer will be included into standard interference prediction techniques because of the high computation cost it entitles. While the effect of the melting layer on interference prediction is found to be minimal, the opposite is true for the ice/snow region situated above the melting layer, especially at high frequencies. Variations in modelling this region yielded substantial variations, in the predicted interference levels. Interference effect is also examined on low-gain fixed and mobile terminals. This effect is found to be debilitating for reliable communication. This makes frequency sharing between services a risky proposition. The Awaka meteorological model is also used as a basis to develop an attenuation model for satellite links that include the effect of the melting layer. Several links, which are part of the Advanced Communications Technology Satellite (ACTS) program, are used to study the effect of the melting layer on total attenuation. It is shown that, while the melting layer's effect is small at low latitudes, the opposite is true at high latitudes. Simplified models for specific, total and excess attenuation in the melting layer are developed and simple procedures to use these models in conjunction with traditional rain-only attenuation models are presented. These were shown to agree well with predictions, using the rigorous approach. This study is relevant for the new generation of satellite networks geared toward the delivery of low-cost bandwidth to small businesses and homes.
Transfer Learning for Aided Target Recognition: Comparing Deep Learning to other Machine Learning Approaches
Creators: name: Rivera, Samuel
name: Mendoza-Schrock, Olga
name: Diehl, Ashley
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Aided target recognition (AiTR), the problem of classifying objects from sensor data, is an important problem with applications across industry and defense. While classification algorithms continue to improve, they often require more training data than is available or they do not transfer well to settings not represented in the training set. These problems are mitigated by transfer learning (TL), where knowledge gained in a well-understood source domain is transferred to a target domain of interest. In this context, the target domain could represents a poorly-labeled dataset, a different sensor, or an altogether new set of classes to identify. While TL for classification has been an active area of machine learning (ML) research for decades, transfer learning within a deep learning framework remains a relatively new area of research. Although deep learning (DL) provides exceptional modeling flexibility and accuracy on recent real world problems, open questions remain regarding how much transfer benefit is gained by using DL versus other ML architectures. Our goal is to address this shortcoming by comparing transfer learning within a DL framework to other ML approaches across transfer tasks and datasets. Our main contributions are: 1) an empirical analysis of DL and ML algorithms on several transfer tasks and domains including gene expressions and satellite imagery, and 2) a discussion of the limitations and assumptions of TL for aided target recognition -- both for DL and ML in general. We close with a discussion of future directions for DL transfer.
Combinatorics of transformations from standard to non-standard bases in Brauer algebras
Creators: name: Chilla, Vincenzo
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 20C35;05E99

description: Transformation coefficients between standard bases for irreducible representations of the Brauer centralizer algebra $\mathfrak{B}_f(x)$ and split bases adapted to the $\mathfrak{B}_{f_1} (x) \times \mathfrak{B}_{f_2} (x) \subset \mathfrak{B}_f (x)$ subalgebra ($f_1 +f_2 = f$) are considered. After providing the suitable combinatorial background, based on the definition of $i$-coupling relation on nodes of the subduction grid, we introduce a generalized version of the subduction graph which extends the one given in J. Phys. A: Math. Gen. $\mathbf{39}$ 7657-7668 for symmetric groups. Thus, we can describe the structure of the subduction system arising from the linear method and give an outline of the form of the solution space. An ordering relation on the grid is also given and then, as in the case of symmetric groups, the choices of the phases and of the free factors governing the multiplicity separations are discussed.
description: IOP class; 19 pages, 2 figures
Dual exponential polynomials and a problem of Ozawa
Creators: name: Heittokangas, Janne
name: Ishizaki, Katsuya
name: Tohge, Kazuya
name: Wen, Zhi-Tao
Publisher: name: arXiv
Year: 2021
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 30D15, 30D35

description: Complex linear differential equations with entire coefficients are studied in the situation where one of the coefficients is an exponential polynomial and dominates the growth of all the other coefficients. If such an equation has an exponential polynomial solution $f$, then the order of $f$ and of the dominant coefficient are equal, and the two functions possess a certain duality property. The results presented in this paper improve earlier results by some of the present authors, and the paper adjoins with two open problems.
description: 17 pages
ProDOMA: improve PROtein DOMAin classification for third-generation sequencing reads using deep learning
Creators: name: Nan, Du
name: Shang, Jiayu
name: Sun, Yanni
Publisher: name: arXiv
Year: 2020
Subjects: subject: Genomics (q-bio.GN)
subject: Machine Learning (cs.LG)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Motivation: With the development of third-generation sequencing technologies, people are able to obtain DNA sequences with lengths from 10s to 100s of kb. These long reads allow protein domain annotation without assembly, thus can produce important insights into the biological functions of the underlying data. However, the high error rate in third-generation sequencing data raises a new challenge to established domain analysis pipelines. The state-of-the-art methods are not optimized for noisy reads and have shown unsatisfactory accuracy of domain classification in third-generation sequencing data. New computational methods are still needed to improve the performance of domain prediction in long noisy reads. Results: In this work, we introduce ProDOMA, a deep learning model that conducts domain classification for third-generation sequencing reads. It uses deep neural networks with 3-frame translation encoding to learn conserved features from partially correct translations. In addition, we formulate our problem as an open-set problem and thus our model can reject unrelated DNA reads such as those from noncoding regions. In the experiments on simulated reads of protein coding sequences and real reads from the human genome, our model outperforms HMMER and DeepFam on protein domain classification. In summary, ProDOMA is a useful end-to-end protein domain analysis tool for long noisy reads without relying on error correction. Availability: The source code and the trained model are freely available at https://github.com/strideradu/ProDOMA. Contact: yannisun@cityu.edu.hk
description: 13 pages, 8 figures (three of them are gourped in Figre. 6)