cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Καταγραφή πραγματικού χρόνου με κάμερα, ατόμων πληρώματος και αναγνώριση αυτών, στο μηχανοστάσιο ενός πλοίου, με χρήση αλγορίθμων μηχανικής όρασης
title: Integrated dead man alarm for vessels’ engine room, with real time crew’s presence supervision and monitoring, using mechanical vision algorithms
titleType: AlternativeTitle
Creators: name: Γεωργίου, Ηλίας
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2021
Subjects: Μηχανική όραση
Mechanical vision
Νευρωνικά δίκτυα
Python (Γλώσσα προγραμματισμού)
OpenCV
Ανίχνευση προσώπου
Αναγνώριση προσώπου
Πλοία
Αλγόριθμοι
Μηχανοστάσιο πλοίου

description: Στο πλαίσιο αυτής της Διπλωματικής Διατριβής, έγινε προσπάθεια να αναφερθούμε σε κάποια από τα χαρακτηριστικά των αλγορίθμων αναγνώρισης προσώπων, και να υλοποιηθεί ένας τέτοιος αλγόριθμος σε Python shell με τη χρήση της βιβλιοθήκης ανοικτού κώδικα OpenCV. Στόχος της εφαρμογής είναι η μέγιστη αποτελεσματικότητα με το ελάχιστο δυνατό κόστος. Όπως παρουσιάζεται παρακάτω, η αναγνώριση προσώπου με τη χρήση Μηχανικής Όρασης βασίζεται σε δυο διαφορετικές διαδικασίες. Η πρώτη εστιάζεται στο αν υπάρχει κάποιο πρόσωπο στο εξεταζόμενο αρχείο πραγματικού χρόνου (στην προκειμένη περίπτωση καταγραφή βίντεο από μικροκάμερα). Η δεύτερη εστιάζεται στην εκπαίδευση του μοντέλου με συγκεκριμένα δεδομένα αυτόματα, και η σύγκριση των δεδομένων ώστε να κριθεί εάν ταιριάζουν ή όχι με κάποια κριτήρια που ορίζουμε εμείς. Επιπρόσθετα, και για την υλοποίηση της εφαρμογής “Dead Man Alarm” που χρησιμοποιείται βάσει κανονισμού σε μηχανοστάσια εμπορικών πλοίων, ο αλγόριθμος εξετάζει και αποφασίζει εάν τίθεται λόγος ειδοποίησης των άλλων μελών του πληρώματος σε περίπτωση που κατά την επιθεώρηση μηχανημάτων του πλοίου, εκτός κανονικού ωραρίου, βρεθεί μέλος του πληρώματος ακίνητο. Έτσι, μετά την επιγραμματική επεξήγηση των επιμέρους τμημάτων του αλγορίθμου, γίνεται αναλυτική παρουσίαση αυτού, καθώς και του χρησιμοποιούμενου εξοπλισμού. Τα αποτελέσματα του αλγορίθμου δείχνουν ότι αποδίδει καλά κάτω από τις δύσκολες συνθήκες που επικρατούν στο μηχανοστάσιο του πλοίου (υψηλές θερμοκρασίες, κραδασμοί ασταθούς συχνότητας και διάρκειας, επικίνδυνα αέρια, κακός φωτισμός) αναγνωρίζοντας και ταυτοποιώντας κάποιο πρόσωπο, και στη συνέχεια εξετάζοντας εάν τίθεται λόγος ανησυχίας λόγω ξαφνικής ακινησίας κάποιου μέλους του πληρώματος.
Non-Abelian structures in compactifications of M-theory on seven-manifolds with SU(3) structure
Creators: name: Aharony, Ofer
name: Berkooz, Micha
name: Louis, Jan
name: Micu, Andrei
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study M-theory compactified on a specific class of seven-dimensional manifolds with SU(3) structure. The manifolds can be viewed as a fibration of an arbitrary Calabi-Yau threefold over a circle, with a U-duality twist around the circle. In some cases we find that in the four dimensional low energy effective theory a (broken) non-Abelian gauge group appears. Furthermore, such compactifications are shown to be dual to previously analyzed compactifications of the heterotic string on K3 x T^2, with background gauge field fluxes on the T^2.
description: 35 pages, minor changes; version to appear in JHEP
Effect of pressure on the structural phase transition and superconductivity in (B$_{1-x}K_x)Fe_2As_2 (x = 0 and 0.45) and SrFe_2As_2 single crystals
Creators: name: Torikachvili, M. S.
name: Bud'ko, S. L.
name: Ni, N.
name: Canfield, P. C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The effects of pressure up to $\sim 20$ kbar, on the structural phase transition of SrFe$_2$As$_2$ and lightly Sn-doped BaFe$_2$As$_2$, as well as on the superconducting transition temperature and upper critical field of (Ba$_{0.55}$K$_{0.45}$)Fe$_2$As$_2$ single crystals have been studied. All the transition temperatures decrease with pressure in an almost linear fashion. Under pressure, the upper critical field curve, $H_{c2}(T)$, for (Ba$_{0.55}$K$_{0.45}$)Fe$_2$As$_2$ shifts down in temperature to follow the zero field $T_c$ with very little change in slope. Composite $P - T$ phase diagrams for three parent compounds, AFe$_2$As$_2$ (A = Ba, Sr, Ca), are constructed and appear to be remarkably similar: (i) having a structural (antiferromagnetic) phase transition line with a negative slope and (ii) showing signs of the emerging superconducting state at intermediate pressures.
Photoluminescence Tuning Through Irradiation Defects in CH$_3$NH$_3$PbI$_3$ Perovskites
Creators: name: Plantevin, Olivier
name: Valère, Stéphanie
name: Guerfa, Driffa
name: Lédée, Ferdinand
name: Trippé-Allard, Gaëlle
name: Garrot, Damien
name: Deleporte, Emmanuelle
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Defect engineering is applied to hybrid (CH$_3$NH$_3$)PbI$_3$ organic-inorganic perovskites. These materials have become one of the most promising low-cost alternatives to traditional semiconductors in the field of photovoltaics and light emitting devices. We use here Helium ion irradiation at low energy as a tool for the controlled introduction of point defects in both single crystals and polycrystalline thin films. The irradiation defects modify the opto-electronic properties as probed using photoluminescence spectroscopy from 10K to room-temperature. 2 Contrary to usual semiconductors, we observe a very good resilience of the PL properties with irradiation, even associated to an enhancement of the optical emission at low temperature. We discuss these results in relation with the tetragonal to orthorhombic low-temperature phase transition below T=160 K. A comparison between spectra from single crystals and polycrystalline films, both with and without irradiation defects, allow a better understanding of the light emission mechanisms in both kinds of samples. We thereby evidence radiation hardness of these materials and the specificity of defects and their impact over light emission properties.
Recent Results from VERITAS AGN Observations
Creators: name: Benbow, Wystan
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: VERITAS is one of the world's most sensitive detectors of astrophysical very high energy (VHE; E > 100 GeV) gamma rays. This observatory has operated for ~14 years, and nearly 7,000 hours of its observations have been targeted on active galactic nuclei (AGN). Approximately 300 AGN were observed with VERITAS, and 40 are detected. These studies are generally accompanied by contemporaneous, broadband observations, which enable detailed probes of the underlying jet-powered processes. Recent scientific results from VERITAS AGN observations are presented.
description: 9 pages; 5 figures; Contribution to the Proceedings of the 37th International Cosmic Ray Conference (ICRC 2021), Berlin, Germany
An alternative well-posedness property and static spacetimes with naked singularities
Creators: name: Saravi, Ricardo E. Gamboa
name: Sanmartino, Marcela
name: Tchamitchian, Philippe
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In the first part of this paper, we show that the Cauchy problem for wave propagation in some static spacetimes presenting a singular time-like boundary is well posed, if we only demand the waves to have finite energy, although no boundary condition is required. This feature does not come from essential self-adjointness, which is false in these cases, but from a different phenomenon that we call the alternative well-posedness property, whose origin is due to the degeneracy of the metric components near the boundary. Beyond these examples, in the second part, we characterize the type of degeneracy which leads to this phenomenon.
description: 34 pages, 3 figures. Accepted for publication in Class. Quantum Grav
Entanglement of distant atoms by projective measurement: The role of detection efficiency
Creators: name: Zippilli, Stefano
name: Olivares-Renteria, Georgina A.
name: Morigi, Giovanna
name: Schuck, Carsten
name: Rohde, Felix
name: Eschner, Juergen
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We assess proposals for entangling two distant atoms by measurement of emitted photons, analyzing how their performance depends on the photon detection efficiency. We consider schemes based on measurement of one or two photons and compare them in terms of the probability to obtain the detection event and of the conditional fidelity with which the desired entangled state is created. Based on an unravelling of the master equation, we quantify the parameter regimes in which one or the other scheme is more efficient, including the possible combination of the one-photon scheme with state purification. In general, protocols based on one-photon detection are more efficient in set-ups characterized by low photon detection efficiency, while at larger values two-photon protocols are preferable. We give numerical examples based on current experiments.
description: 12 pages, 6 figures
Visualizing elusive phase transitions with geometric entanglement
Creators: name: Orus, Roman
name: Wei, Tzu-Chieh
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We show that by examining the global geometric entanglement it is possible to identify "elusive" or hard to detect quantum phase transitions. We analyze several one-dimensional quantum spin chains and demonstrate the existence of non-analyticities in the geometric entanglement, in particular across a Kosterlitz-Thouless transition and across a transition for a gapped deformed Affleck-Kennedy-Lieb-Tasaki chain. The observed non-analyticities can be understood and classified in connection to the nature of the transitions, and are in sharp contrast to the analytic behavior of all the two-body reduced density operators and their derived entanglement measures.
description: 7 pages, 5 figures, revised version, accepted for publication in PRB
Knot homology groups from instantons
Creators: name: Kronheimer, P. B.
name: Mrowka, T. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57R58; 57M25

description: For each partial flag manifold of SU(N), we define a Floer homology theory for knots in 3-manifolds, using instantons with codimension-2 singularities.
description: 118 pages, 1 figure. v2: Further acknowledgements
Microwave-Driven Atoms: From Anderson Localization to Einstein's Photoeffect
Creators: name: Schelle, Alexej
name: Delande, Dominique
name: Buchleitner, Andreas
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We study the counterpart of Anderson localization in driven one-electron Rydberg atoms. By changing the initial Rydberg state at fixed microwave frequency and interaction time, we numerically monitor the crossover from Anderson localization to the photo effect in the atomic ionization signal.
description: 4 pages, 3 figures
Feynman rules for the rational part of the Electroweak 1-loop amplitudes
Creators: name: Garzelli, M. V.
name: Malamos, I.
name: Pittau, R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present the complete set of Feynman rules producing the rational terms of kind R_2 needed to perform any 1-loop calculation in the Electroweak Standard Model. Our results are given both in the 't Hooft-Veltman and in the Four Dimensional Helicity regularization schemes. We also verified, by using both the 't Hooft-Feynman gauge and the Background Field Method, a huge set of Ward identities -up to 4-points- for the complete rational part of the Electroweak amplitudes. This provides a stringent check of our results and, as a by-product, an explicit test of the gauge invariance of the Four Dimensional Helicity regularization scheme in the complete Standard Model at 1-loop. The formulae presented in this paper provide the last missing piece for completely automatizing, in the framework of the OPP method, the 1-loop calculations in the SU(3) X SU(2) X U(1) Standard Model.
description: Many thanks to Huasheng Shao for having recomputed, independently of us, all of the ${\rm R_2}$ effective vertices. Thanks to his help and by comparing with an independent computation we performed in a general $R_\xi$ gauge, we could fix, in the present version, the following formulae: the vertex $A l \bar l$ in Eq. (3.6), the vertex $Z \phi^+ \phi^-$ in Eq. (3.8), Eqs (3.16), (3.17) and (3.18)
The ground state energy of the Edwards-Anderson spin glass model with a parallel tempering Monte Carlo algorithm
Creators: name: Roma, F.
name: Risau-Gusman, S.
name: Ramirez-Pastor, A. J.
name: Nieto, F.
name: Vogel, E. E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We study the efficiency of parallel tempering Monte Carlo technique for calculating true ground states of the Edwards-Anderson spin glass model. Bimodal and Gaussian bond distributions were considered in two and three-dimensional lattices. By a systematic analysis we find a simple formula to estimate the values of the parameters needed in the algorithm to find the GS with a fixed average probability. We also study the performance of the algorithm for single samples, quantifying the difference between samples where the GS is hard, or easy, to find. The GS energies we obtain are in good agreement with the values found in the literature. Our results show that the performance of the parallel tempering technique is comparable to more powerful heuristics developed to find the ground state of Ising spin glass systems.
description: 30 pages, 17 figures. A new section added. Accepted for publication in Physica A
Classification of quantum states based on the null energy condition
Creators: name: Mandal, Susobhan
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Violation of the null energy condition plays an important role both in the general theory of relativity and quantum field theory in curved spacetimes. Over the years, it has been shown that the violation of the null energy condition leads to instability and violation of causality. In quantum field theory, violation of the energy condition also depends on the quantum states apart from the geometry of curved spacetime. Hence, the quantum effects play an important role in the violation of the null energy condition. We show that the set of all the coherent states does not violate the null energy condition. Further, we also show that under certain conditions, the null energy condition is violated either by a pure state or a mixed state. Furthermore, the dynamical violation of the null energy condition by the quantum states is also discussed here.
description: 14 pages
title: Μελέτη, προγραμματισμός και εγκατάσταση πίνακα αυτοματισμού γεμιστικής μηχανής
title: Design, programming and installation of automation panel in a filling machine
titleType: AlternativeTitle
Creators: name: Ψάλλης, Πέτρος
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2021
Subjects: Γεμιστικές μηχανές
Μικροβιολογικό θρεπτικό υλικό
Ηλεκτροπνευματικά συστήματα
PLC
Προγραμματιζόμενοι λογικοί ελεγκτές
Αυτοματισμός
Βηματικοί κινητήρες
S7-1200
HMI KTP400
Filling machines
Πνευματικά συστήματα

description: Η διπλωματική μου εργασία αναφέρεται σε μια γεμιστική μηχανή μικροβιολογικού θρεπτικού υλικού. Πιο συγκεκριμένα γίνεται περιγραφή στον ηλεκτροπνευματικό αυτοματισμό της και την εγκατάσταση του πίνακα αυτοματισμού. Επίσης γίνεται αναφορά στο προγραμματισμό του PLC και της ΗΜΙ της μηχανής.
Brane Vector Dynamics from Embedding Geometry
Creators: name: Clark, T. E.
name: Love, S. T.
name: Nitta, Muneto
name: ter Veldhuis, T.
name: Xiong, Chi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A Kaluza-Klein decomposition of higher dimensional gravity is performed in the flexible brane world scenario and the properties of the extra vectors resulting from this decomposition are explored. These vectors become massive due to a gravitational Higgs mechanism in which the brane oscillation Nambu-Goldstone bosons become the longitudinal component of the vector fields. The vector mass is found to be proportional to the exponential of the vacuum expectation value of the radion (dilaton) field and as such its magnitude is model dependent. Using the structure of the embedding geometry, the couplings of these vectors to the Standard Model, including those resulting from the extrinsic curvature, are deduced. As an example, we show that for 5D space-time the geometry of the bulk-brane world, either intrinsic or extrinsic, only depends on the extra vector and the 4D graviton. The connection between the embedding geometry and coset construction by non-linear realization is also presented.
description: 20 pages, no figures
Edge-Path Bundling: A Less Ambiguous Edge Bundling Approach
Creators: name: Wallinger, Markus
name: Archambault, Daniel
name: Auber, David
name: Nöllenburg, Martin
name: Peltonen, Jaakko
Publisher: name: arXiv
Year: 2021
Subjects: subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences

description: Edge bundling techniques cluster edges with similar attributes (i.e. similarity in direction and proximity) together to reduce the visual clutter. All edge bundling techniques to date implicitly or explicitly cluster groups of individual edges, or parts of them, together based on these attributes. These clusters can result in ambiguous connections that do not exist in the data. Confluent drawings of networks do not have these ambiguities, but require the layout to be computed as part of the bundling process. We devise a new bundling method, Edge-Path bundling, to simplify edge clutter while greatly reducing ambiguities compared to previous bundling techniques. Edge-Path bundling takes a layout as input and clusters each edge along a weighted, shortest path to limit its deviation from a straight line. Edge-Path bundling does not incur independent edge ambiguities typically seen in all edge bundling methods, and the level of bundling can be tuned through shortest path distances, Euclidean distances, and combinations of the two. Also, directed edge bundling naturally emerges from the model. Through metric evaluations, we demonstrate the advantages of Edge-Path bundling over other techniques.
description: VIS 2021
N-qubit states as points on the Bloch sphere
Creators: name: Mäkelä, H.
name: Messina, A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show how the Majorana representation can be used to express the pure states of an N-qubit system as points on the Bloch sphere. We compare this geometrical representation of N-qubit states with an alternative one, proposed recently by the present authors.
description: 9 pages, 2 figures, contribution to CEWQO 2009 proceedings. v2: Minor changes, published version
Cognitive strategies and social modeling determinants of pain
Creators: name: Greenstein, Howard Barry
Publisher: name: University of British Columbia
Year: 2010

description: Research and clinical observation implicate cognitive and social influences as critical determinants of pain. The present experiment examined the impact of cognitive coping strategies and social modeling influences upon traditional measures of pain threshold and pain tolerance and Sensory Decision theory indices of sensory discriminability and response bias. Following pain pre-testing via cutaneous electrical stimulation, 60 female undergraduates were trained in one of three classes of cognitive strategies via verbal instruction or instruction by videotaped peer models. During post-assessment, half of each group was exposed to a pain-tolerant peer model. Ten subjects served as no-treatment controls. Analyses of pain threshold and pain tolerance data suggested that cognitive strategies may be potent variables in pain reduction. Directional focus of attention did not appear to be the critical determinant of their efficacy. Training in the use of spontaneously-generated strategies appeared to be as effective as instruction in attention-diversion or sensation-transformation strategies. Videotaped instructional modules appeared to be as viable as training by a therapist. The social modeling procedure enhanced the effects of cognitive strategies. Sensory Decision theory analyses revealed that tolerant modeling reduced discriminability at sensory detection levels, while discriminability effects were not evident at supra-pain-threshold levels. Response bias was not affected by the social influence procedure. No remarkable differences in discriminability or response bias were observed between cognitive strategy groups and no-treatment controls, suggesting that effects of cognitive strategies may be primarily mediated through the motivational-affective dimension of pain. At sensory detection levels, cognitive strategy groups displayed differential discriminability under the two instructional modality conditions, suggesting that cognitive determinants may also affect sensory-discriminative aspects of pain. Cognitive and social influences were shown to have potent impact on pain response. Implications of these findings for theory and clinical practice were discussed.
Probing Reionization with the 21 cm-Galaxy Cross Power Spectrum
Creators: name: Lidz, Adam
name: Zahn, Oliver
name: Furlanetto, Steven
name: McQuinn, Matthew
name: Hernquist, Lars
name: Zaldarriaga, Matias
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The cross-correlation between high redshift galaxies and 21 cm emission from the high redshift intergalactic medium (IGM) promises to be an excellent probe of the Epoch of Reionization (EoR). On large scales, the 21 cm and galaxy fields are anti-correlated during most of the reionization epoch. However, on scales smaller than the size of the H II regions around detectable galaxies, the two fields become roughly uncorrelated. Consequently, the 21 cm-galaxy cross power spectrum provides a tracer of bubble growth during reionization, with the signal turning over on progressively larger scales as reionization proceeds. The precise turnover scale depends on the minimum host mass of the detectable galaxies, and the galaxy selection technique. Measuring the turnover scale as a function of galaxy luminosity constrains the characteristic bubble size around galaxies of different luminosities. The cross spectrum becomes positive on small scales if ionizing photons fail to escape from low mass galaxies, and these galaxies are detectable longward of the hydrogen ionization edge, because in this case some identifiable galaxies lie outside of ionized regions. LOFAR can potentially measure the 21 cm-galaxy cross spectrum in conjunction with mild extensions to the existing Subaru survey for $z=6.6$ Lyman-alpha emitters, while the MWA is slightly less sensitive for detecting the cross spectrum. A futuristic galaxy survey covering a sizable fraction of the MWA field of view ($\sim 800$ deg$^2$) can probe the scale dependence of the cross spectrum, constraining the filling factor of H II regions at different redshifts during reionization, and providing other valuable constraints on reionization models.
description: 17 pages, 12 figures, submitted to ApJ
Dzyaloshinskii interaction and exchange-relativistic effects in orthoferrites
Creators: name: Moskvin, A. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present an overview of the microscopic theory of the Dzyaloshinskii-Moriya (DM) coupling and related exchange-relativistic effects such as exchange anisotropy, electron-nuclear antisymmetric supertransferred hyperfine interactions, antisymmetric magnetogyrotropic effects, and antisymmetric magnetoelectric coupling in strongly correlated 3$d$ compounds focusing on orthoferrites RFeO$_3$ (R is a rare-earth ion or yttrium Y). % Particular emphasis will be placed on the role of crystal field effects, the sense and direction of the Dzyaloshinskii vector, its dependence on the superexchange bonding geometry, and other subtle features of exchange-relativistic effects. Most attention in the paper centers around the derivation of the Dzyaloshinskii vector, its value, orientation, and sense (sign) under different types of the (super)exchange interaction and crystal field. Microscopically derived expression for the dependence of the Dzyaloshinskii vector on the superexchange geometry allows one to find all the overt and hidden canting angles in orthoferrites RFeO$_3$ as well as corresponding contribution to magnetic anisotropy. Being based on the theoretical predictions regarding the sign of the Dzyaloshinskii vector we have predicted and study in detail a novel magnetic phenomenon, {\it weak ferrimagnetism} in mixed weak ferromagnets with competing signs of the Dzyaloshinskii vectors. The ligand NMR measurements in weak ferromagnets are shown to be an effective tool to inspect the effects of DM coupling in an external magnetic field. Along with orthoferrites RFeO$_3$ and weak ferrimagnets RFe$_{1-x}$Cr$_x$O$_3$, although to a lesser extent, we address such typical weak ferromagnets as $α$-Fe$_2$O$_3$, FeBO$_3$, and FeF$_3$.
description: 41 pages, 12 figures
The Electrosphere of Macroscopic "Quark Nuclei": A Source for Diffuse MeV Emissions from Dark Matter
Creators: name: Forbes, Michael McNeil
name: Lawson, Kyle
name: Zhitnitsky, Ariel R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using a Thomas-Fermi model, we calculate the structure of the electrosphere of the quark antimatter nuggets postulated to comprise much of the dark matter. This provides a single self-consistent density profile from ultrarelativistic densities to the nonrelativistic Boltzmann regime that use to present microscopically justified calculations of several properties of the nuggets, including their net charge, and the ratio of MeV to 511 keV emissions from electron annihilation. We find that the calculated parameters agree with previous phenomenological estimates based on the observational supposition that the nuggets are a source of several unexplained diffuse emissions from the Galaxy. As no phenomenological parameters are required to describe these observations, the calculation provides another nontrivial verification of the dark-matter proposal. The structure of the electrosphere is quite general and will also be valid at the surface of strange-quark stars, should they exist.
description: 20 Pages, REVTeX4.1
The Sloan Lens ACS Survey. VIII. The relation between environment and internal structure of early-type galaxies
Creators: name: Treu, T.
name: Gavazzi, R.
name: Gorecki, A.
name: Marshall, P. J.
name: Koopmans, L. V. E.
name: Bolton, A. S.
name: Moustakas, L. A.
name: Burles, S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the relation between the internal structure of early-type galaxies and their environment using 70 strong gravitational lenses from the Sloan ACS Lens Survey. The Sloan database is used to determine two measures of overdensity of galaxies around each lens: the projected number density of galaxies inside the tenth nearest neighbor (Σ_{10}) and within a cone of radius one h^{-1} Mpc (D_1). Our main results are: 1) The average overdensity is somewhat larger than unity, consistent with lenses preferring overdense environments as expected for massive early-type galaxies (12/70 lenses are in known groups/clusters). 2) The distribution of overdensities is indistinguishable from that of "twin" non-lens galaxies selected from SDSS to have the same redshift and stellar velocity dispersion σ_*. Thus, within our errors, lens galaxies are an unbiased population, and the SLACS results can be generalized to the overall population of early-type galaxies. 3) Typical contributions from external mass distribution are no more than a few per cent, reaching 10-20% (~0.05-0.10 external convergence) only in the most extreme overdensities. 4) No significant correlation between overdensity and slope of the mass density profile of the lens is found. 5) Satellite galaxies (those with a more luminous companion) have marginally steeper mass density profiles than central galaxies (those without). This result suggests that tidal stripping may affect the mass structure of early-type galaxies down to kpc scales probed by strong lensing, when they fall into larger structures [ABRIDGED].
description: ApJ, in press; minor changes with respect to v1
Nonabelian D-branes, Open Strings, and Gauge Theory
Creators: name: Thorn, Charles B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: There is a subtle difference between the open string dynamics determined by the original dual resonance models and that determined by D-brane constructions within critical closed string theory. For instance, in contrast to the former, the latter have massless scalars in addition to the massless gluon shared by both. We introduce and explain the concept of nonabelian D-branes which illuminates this distinction. We employ this concept to offer new possibilities for string duals for large N QCD (pure Yang-Mills gauge theory).
description: 13 pages, 1 figure
Partial CMB maps: bias removal and optimal binning of the angular power spectrum
Creators: name: Ansari, R.
name: Magneville, C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a semi-analytical method to investigate the systematic effects and statistical uncertainties of the calculated angular power spectrum when incomplete spherical maps are used. The computed power spectrum suffers in particular a loss of angular frequency resolution, which can be written as δ_l ~ π/γ_max, where γ_max is the effective maximum extent of the partial spherical maps. We propose a correction algorithm to reduce systematic effects on the estimated C_l, as obtained from the partial map projection on the spherical harmonic Ylm(l,m) basis. We have derived near optimal bands and weighting functions in l-space for power spectrum calculation using small maps, and a correction algorithm for partially masked spherical maps that contain information on the angular correlations on all scales.
description: 11 pages
Confident, moderate, reluctant: Young women’s trajectories in their willingness to refuse unwanted sex
Creators: name: Weitzman, Abigail
name: Mallory, Allen B.
Publisher: name: University of Texas at Austin Population Research Center
Year: 2019
Subjects: unwanted sex
young women
sexual and reproductive health

description: Unwanted sex is widely experienced by young women in the United States, and previous research has identified the factors associated with young women agreeing to have unwanted sex. However, much less is known about young women’s willingness to refuse sex. This brief, from PRC faculty research associate Abigail Weitzman and PRC graduate student trainee Allen Mallory, reports on a study that is the first of its kind to examine this willingness to refuse sex and explore how it evolves during the transition to adulthood. They find that young women follow three trajectories in their willingness to refuse unwanted sex: confident, moderate, and reluctant.
Reversible Photo-Induced Phase Segregation and Origin of Long Carrier Lifetime in Mixed-Halide Perovskite Films
Creators: name: Gautam, Subodh
name: Kim, Minjin
name: Miquita, Douglas
name: Bouree, Jean-Eric
name: Geffroy, Bernard
name: Plantevin, Olivier
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Mixed-halide based hybrid perovskite semiconductors have attracted tremendous attention as a promising candidate for high efficient photovoltaic and light-emitting devices. However, these advanced perovskite materials may undergo phase segregation under light illumination due to halide ion migration, affecting their optoelectronic properties. Here, we report photo-excitation induced phase segregation in triple-cation mixed-halide perovskite films that yields to red-shift in photoluminescence response. We demonstrate that photo-excitation induced halide ion migration leads to the formation of smaller-bandgap iodide-rich and larger-bandgap bromide-rich domains in the perovskite film, where the phase segregation rate is found to follow the excitation power-density as a power law. Results confirm that charge carrier lifetime increases with redshift in photoluminescence due to the trapping of photo-excited carriers in the segregated smaller-bandgap iodide-rich domains. Interestingly, we found that these photo-induced changes are fully reversible and thermally activated when the excitation power is turned off. A significant difference in activation energies for halide ion migration is observed during phase segregation and recovery process under darkness. Additionally, we have investigated the emission linewidth broadening as a function of temperature which is governed by the exciton-optical phonon coupling. The mechanism of photo-induced phase segregation is interpreted based on excitonphonon coupling strength in both mixed and demixed (segregated) states of perovskite film.
Theories of reference
Creators: name: Hahn, Martin
Publisher: name: University of British Columbia
Year: 2010

description: The aim of this thesis is to put in both historical and logical perspective certain features of current theories of reference. The theory of reference came to life as a separate subject around the turn of the century in the writings of Gottlob Frege and Rertrand Russell. Although their theories are quite different in detail, they have some important features in common. One of these is the methodological commitment to study language on its own, as a set of sentences more or less. This is reflected in the theory of reference by their determination to describe how expressions refer without regard for the linguistic or non-linguistic context they occur in. Another important common feature of the two "classical" theories, as I will call them, is that expressions accomplish reference by specifying a set of conditions such that the referent and only the referent satisfy them. In recent years these two assumptions have been questioned by philosophers such as Saul Kripke, Keith Donnellan, David Kaplan, and others who have been developing what can fairly be called the "new" theory of reference. In following the development from the classical to the new theories, I concentrate on the set of problems generated by the phenomenon of referentially opaque contexts. After setting out, in Chapter I, the main features of Russell's and Frege's theories, I devote a chapter to W. V. O. Quine's considerable contribution to our understanding of these contexts. I discuss, among other things, the relationship between a certain understanding of modal contexts and the metaphysical theory of essentialism and try to determine to what extent Quine was right in condemning quantified modal logic on the grounds that it is committed to essentialism. The third and final chapter is devoted to the new theories of reference. Throughout the thesis I am concerned to relate a whole range of important distinctions whose interconnections have not been sufficiently well understood. Apart from the distinction between reference accomplished by means of a set of conditions and reference linking term and object directly, there is Quine's distinction between opaque and transparent contexts, Frege's between oblique and direct ones, Russell's between primary and secondary scopes of definite descriptions, Saul Kripke's between rigid and non-rigid designators, K. Donnellan's between referential and attributive uses of definite descriptions, and the various interpretations of the medieval De Re - De Dicto distinction. I think that there is a general agreement that all these and some other distinctions are related in various ways. In this thesis I describe just some of these relations. My aim is not to come to any definite conclusions about reference, but merely to understand how the different conclusions which philosophers have already reached relate to one another.
Study of chargino-neutralino production at hadron colliders in a long-lived slepton scenario
Creators: name: Kitano, Ryuichiro
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The differential cross section of the chargino-neutralino production, q qbar --> chi+- chi0, followed by their decays into scalar tau leptons, chi+- chi0 --> (stau+- nu)(stau-+ tau+-) --> (stau+- nu)(stau-+ l+- nu nubar), is calculated including the effect of spin correlations. In the case where stau is long-lived, this final state can be fully reconstructed in a hadron-collider experiment up to a discrete two-fold ambiguity. Distributions of various kinematic variables can thus be observable and tell us about masses and spins of superparticles and also parity/CP violation in interactions by comparing with the cross-section formula. Observing non-trivial distributions derived in this paper will be a good test of supersymmetry.
description: 35 pages, 14 figures, 1 table, version to appear in JHEP
MODC: Resilience for disaggregated memory architectures using task-based programming
Creators: name: Keeton, Kimberly
name: Singhal, Sharad
name: Volos, Haris
name: Zhang, Yupu
name: Chaurasiya, Ramesh Chandra
name: Crasta, Clarete Riana
name: George, Sherin T
name: N, Nagaraju K
name: K, Mashood Abdulla
name: Natarajan, Kavitha
name: Shome, Porno
name: Suresh, Sanish
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences
subject: D.4.1; D.4.5; D.4.7; C.1.4; E.1

description: Disaggregated memory architectures provide benefits to applications beyond traditional scale out environments, such as independent scaling of compute and memory resources. They also provide an independent failure model, where computations or the compute nodes they run on may fail independently of the disaggregated memory; thus, data that's resident in the disaggregated memory is unaffected by the compute failure. Blind application of traditional techniques for resilience (e.g., checkpoints or data replication) does not take advantage of these architectures. To demonstrate the potential benefit of these architectures for resilience, we develop Memory-Oriented Distributed Computing (MODC), a framework for programming disaggregated architectures that borrows and adapts ideas from task-based programming models, concurrent programming techniques, and lock-free data structures. This framework includes a task-based application programming model and a runtime system that provides scheduling, coordination, and fault tolerance mechanisms. We present highlights of our MODC prototype and experimental results demonstrating that MODC-style resilience outperforms a checkpoint-based approach in the face of failures.
description: 9 pages, 4 figures
Additional file 2 of Endothelial damage in septic shock patients as evidenced by circulating syndecan-1, sphingosine-1-phosphate and soluble VE-cadherin: a substudy of ALBIOS
Creators: name: Piotti, Arianna
name: Novelli, Deborah
name: Meessen, Jennifer Marie Theresia Anna
name: Ferlicca, Daniela
name: Coppolecchia, Sara
name: Marino, Antonella
name: Salati, Giovanni
name: Savioli, Monica
name: Grasselli, Giacomo
name: Bellani, Giacomo
name: Pesenti, Antonio
name: Masson, Serge
name: Caironi, Pietro
name: Gattinoni, Luciano
name: Gobbi, Marco
name: Fracasso, Claudia
name: Latini, Roberto
Publisher: name: figshare
Year: 2021
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 2: Syndecan1, Sphingosine-1-phosphate, VE-cadherin and circulating biomarkers. Table 1. Circulating biomarkers, albumin and lactate levels by tertiles of Syndecan-1 on day 1; Table 2. Circulating biomarkers, albumin and lactate levels by tertiles of S1P on day 1; Table 3. Circulating biomarkers, albumin and lactate levels by tertiles of VE-Cadherin on day 1. Figure 1. Spearman rank correlation coefficient for SYN-1, S1P and VE-cadherin on days 1, 2 and 7.
On the Lie-algebraic origin of metric 3-algebras
Creators: name: de Medeiros, Paul
name: Figueroa-O'Farrill, José
name: Méndez-Escobar, Elena
name: Ritter, Patricia
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Since the pioneering work of Bagger-Lambert and Gustavsson, there has been a proliferation of three-dimensional superconformal Chern-Simons theories whose main ingredient is a metric 3-algebra. On the other hand, many of these theories have been shown to allow for a reformulation in terms of standard gauge theory coupled to matter, where the 3-algebra does not appear explicitly. In this paper we reconcile these two sets of results by pointing out the Lie-algebraic origin of some metric 3-algebras, including those which have already appeared in three-dimensional superconformal Chern-Simons theories. More precisely, we show that the real 3-algebras of Cherkis-Saemann, which include the metric Lie 3-algebras as a special case, and the hermitian 3-algebras of Bagger-Lambert can be constructed from pairs consisting of a metric real Lie algebra and a faithful (real or complex, respectively) unitary representation. This construction generalises and we will see how to construct many kinds of metric 3-algebras from pairs consisting of a real metric Lie algebra and a faithful (real, complex or quaternionic) unitary representation. In the real case, these 3-algebras are precisely the Cherkis-Saemann algebras, which are then completely characterised in terms of this data. In the complex and quaternionic cases, they constitute generalisations of the Bagger-Lambert hermitian 3-algebras and anti-Lie triple systems, respectively, which underlie N=6 and N=5 superconformal Chern-Simons theories, respectively. In the process we rederive the relation between certain types of complex 3-algebras and metric Lie superalgebras.
description: 29 pages (v4: really final version to appear in CMP. Example 7 has been improved.)
Supertwistor space for 6D maximal super Yang-Mills
Creators: name: Dennen, Tristan
name: Huang, Yu-tin
name: Siegel, Warren
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: 6D maximal super Yang-Mills on-shell amplitudes are formulated in superspace using 6 dimensional twistors. The 3,4,5-point tree amplitudes are obtained by supersymmetrizing their bosonic counterparts and confirmed through the BCFW construction. In contrast to 4D this superspace is non-chiral, reflecting the fact that one cannot differentiate MHV from $\bar{\rm MHV}$ in 6D. Combined with unitarity methods, this superspace should be useful for the study of multi-loop D dimensional maximal super Yang-Mills and gravity amplitudes. Furthermore, the non-chiral nature gives a natural framework for an off-shell construction. We show this by matching our result with off-shell D=4 N=4 super Yang-Mills amplitudes, expressed in projective superspace.
description: 6 figures 28 pages. with better signs
The history and development of the science of surgery
Creators: name: Gorman, Mary G.
Publisher: name: University of Oregon
Year: 1932
Subjects: Surgical Procedures, Operative

description: In approaching this subject it should be realized to what extent one could be led in investigating the matter. To really cover the field properly, it would take a much greater length of time than we have to give. Surgery itself as a science had not always been known separately. It is very closely connected with Medicine. Different branches of study are important in order to fully comprehend the extensiveness of the topic. Anatomy is vital, because without it one could not expect to do successful work in surgery. Physiology is necessary to understand the mechanism of the various systems of the body and the importance an organ plays in this function. Pathology is essential in order to be able to recognize disease tissue of the viscera. Bacteriology is important so that one knows the effect of bacteria on organic tissue.
Spectrophotometry with Hectospec, the MMT's Fiber-Fed Spectrograph
Creators: name: Fabricant, Daniel G.
name: Kurtz, Michael J.
name: Geller, Margaret J.
name: Caldwell, Nelson
name: Woods, Deborah
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We describe techniques for photometric calibration of optical spectra obtained with the MMT's fiber-fed spectrograph, Hectospec. The atmospheric dispersion compensation prisms built into the MMT's f/5 wide field corrector effectively eliminate errors due to differential refraction, and simplify the calibration procedure. The procedures that we describe here are applicable to all 220,000+ spectra obtained to date with Hectospec because the instrument response is stable. We estimate the internal error in the Hectospec measurements by comparing duplicate measurements of $\sim$1500 galaxies. For a sample of 400 galaxies in the Smithsonian Hectospec Lensing Survey (SHELS) with a median z=0.10, we compare line and continuum fluxes measured by Hectospec through a 1.5 arcsec diameter optical fiber with those measured by the Sloan Digital Sky Survey (SDSS) through a 3 arcsec diameter optical fiber. Agreement of the [OII] and H alpha SHELS and SDSS line fluxes, after scaling by the R band flux in the different apertures, suggests that the spatial variation in star formation rates over a 1.5 to 3 kpc radial scale is small. The median ratio of the Hectospec and SDSS spectra, smoothed over 100 Angstrom scales, is remarkably constant to ~5% over the range of 3850 to 8000 Angstroms. Offsets in the ratio of the median [OII] and H alpha fluxes, the equivalent width of H delta and the continuum index d4000 are a few percent, small compared with other sources of scatter.