cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Tissues and Milk Residues of Tansy Ragwort Alkloids
Creators: name: Dickinson, John O.
Publisher: name: American Association of Bovine Practitioners  Proceedings of the Annual Conference
Year: 1981

description: There are more than 1,200 species of senecio in the world. Several of these species contain a varying number of pyrrolizidine alkaloids. Certain molecular configurations of these alkaloids are hepatotoxic and are considered carcinogenic by some pathologists. Senecio jacobaea (tansy ragwort), a plant that contains pyrrolizidine alkaloids has been responsible for death losses of cattle and horses in California, Oregon and Washington. It has been suggested that pyrrolizidine alkaloids might be transferred into the milk of lactating dairy cattle and lactating dairy goats consuming contaminated pasture, hay, or silage. In addition, there was concern expressed of a possible public health threat to the human population, primarily from contaminated milk but also from tissue of meat consumed for food. Because of this concern, certain studies were undertaken at Washington State University College of Veterinary Medicine in order to determine the validity of these particular concerns.
description: American Association of Bovine Practitioners Proceedings of the Annual Conference, 1981
Angular distribution of leptons from the decay of massive vector bosons
Creators: name: Berger, Edmond L.
name: Qiu, Jian-Wei
name: Rodriguez-Pedraza, Ricardo A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We examine the transverse momentum $Q_\perp$ dependence of the helicity structure functions for massive vector bosons of mass $Q$ in hadron reactions. We demonstrate that large logarithmic terms of the form $\ln(Q/Q_\perp)$ in the helicity structure functions have the same origin as the logarithmic terms in the angular-integrated cross section and that they can be resummed to all orders in the strong coupling $α_s$, in the same way as the angular-integrated cross section. As a consequence of current conservation, the resummed part of the helicity structure functions preserves the Lam-Tung relation as a function of $Q_\perp$ to all orders in $α_s$.
description: 4 pages; a few changes in wording; one reference added. Version in press at Phys. Lett. B
Hypervelocity stars and the environment of Sgr A*
Creators: name: Sesana, A.
name: Haardt, F.
name: Madau, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Hypervelocity stars (HVSs) are a natural consequence of the presence of a massive nuclear black hole (Sgr A*) in the Galactic Center. Here we use the Brown et al. sample of unbound and bound HVSs together with numerical simulations of the propagation of HVSs in the Milky Way halo to constrain three plausible ejection mechanisms: 1) the scattering of stars bound to Sgr A* by an inspiraling intermediate-mass black hole (IMBH); 2) the disruption of stellar binaries in the tidal field of Sgr A*; and 3) the two-body scattering of stars off a cluster of stellar-mass black holes orbiting Sgr A*. We compare the predicted radial and velocity distributions of HVSs with the limited-statistics dataset currently available, and show that the IMBH model appears to produce a spectrum of ejection velocities that is too flat. Future astrometric and deep wide-field surveys of HVSs should shed unambiguous light on the stellar ejection mechanism and probe the Milky Way potential on scales as large as 200 kpc.
description: 5 pages, 5 figures, accepted for publication in MNRAS letters
New Physics Effects in Higgs Decay to Tau Leptons
Creators: name: Mantry, Sonny
name: Ramsey-Musolf, Michael J.
name: Trott, Michael
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the possible effects of TeV scale new physics (NP) on the rate for Higgs boson decays to charged leptons, focusing on the tau tau channel which can be readily studied at the Large Hadron collider. Using an SU(3)_C X SU(2)_L X U(1)_Y invariant effective theory valid below a NP scale Lambda, we determine all effective operators up to dimension six that could generate appreciable contributions to the decay rate and compute the dependence of the rate on the corresponding operator coefficients. We bound the size of these operator coefficients based on the scale of the tau mass, naturalness considerations, and experimental constraints on the tau anomalous magnetic moment. These considerations imply that contributions to the decay rate from a NP scale Lambda ~ TeV could be comparable to the prediction based on the SM Yukawa interaction. A reliable test of the Higgs mechanism for fermion mass generation via the h-> tau tau channel is possible only after such NP effects are understood and brought under theoretical control.
description: 10 pages, 6 figures, V2: typos corrected
Μέθοδοι διαμοιρασμού πόρων και δρομολόγησης σε συστήματα ομότιμων:
Creators: name: Λούκος, Φώτιος Ζ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Συστήματα ομότιμων
Διαμοιρασμός πόρων
Δρομολόγηση
Συστήματα πραγματικού χρόνου
Peer-to-Peer systems
Resource sharing
Routing
Real-time systems

description: Η παρούσα διατριβή εστιάζει σε ένα αριθμό από προβλήματα τα οποία αντιμετωπίζονται στην κατασκευή και λειτουργία των συστημάτων ομότιμων εταίρων και παρέχει έναν αριθμό από λύσεις. Αρχικά, γίνεται μία μελέτη των συστημάτων ομότιμων φίλων, μίας μορφής συστημάτων ομότιμων εταίρων όπου αντιμετωπίζεται το πρόβλημα της μειωμένης ιδιωτικότητας αλλά εισάγονται νέα προβλήματα. Στα συστήματα αυτά εισάγεται η έννοια της φήμης η οποία επιτρέπει την επίλυση προβλημάτων αυτών. Στην συνέχεια αναλύεται το πρόβλημα της τραγωδίας των κοινών και παρουσιάζονται δύο τεχνικές για την αντιμετώπισή του. Η πρώτη κάνει χρήση της νοημοσύνης σμήνους ενώ η δεύτερη βασίζεται σε οικονομικές μεθόδους. Στο τελευταίο τμήμα της διατριβής παρουσιάζεται το πρόβλημα της διάδοσης δεδομένων πραγματικού χρόνου σε κινητά συστήματα ομότιμων εταίρων. Στα συστήματα αυτά αναπτύχθηκαν τέσσερις αλγόριθμοι δρομολόγησης οι οποίοι λαμβάνουν υπόψιν τους την χρονική προθεσμία αλλά και την προτεραιότητα στην διάδοση των δεδομένων. Συνοπτικά, η συνεισφορά της παρούσας διατριβής εντοπίζεται στην αντιμετώπιση προβλημάτων τα οποία εμφανίζονται σε συστήματα ομότιμων εταίρων.
description: This dissertation focuses on a number of problems that are encountered at the design and operation of Peer-to-Peer systems and presents a number of solutions. Initially, Friend-to-Friend systems are studied. These systems are a form of Peer-to-Peer systems designed to address the problem of reduced privacy while introducing new problems. At these systems, using the concept of peer reputation, a solution to these problems is presented. Afterwards, the problem of the tragedy of the commons is presented and two different methods for addressing it are illustrated. The first method uses swarm intelligence, part of the biologically inspired computing, while the second one is based on economic techniques. Finally, the problem of real-time data dissemination in mobile Peer-to-Peer systems is presented. Four different routing algorithms are presented which take into consideration the deadline and the priority in the dissemination of data streams. In summary, the contribution of this dissertation is the addressing of problems that arise at many types of Peer-to-Peer systems.
Subexponential rate versus distance with time-multiplexed quantum repeaters
Creators: name: Dhara, Prajit
name: Patil, Ashlesha
name: Krovi, Hari
name: Guha, Saikat
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum communications capacity using direct transmission over length-$L$ optical fiber scales as $R \sim e^{-αL}$, where $α$ is the fiber's loss coefficient. The rate achieved using a linear chain of quantum repeaters equipped with quantum memories, probabilistic Bell state measurements (BSMs) and switches used for spatial multiplexing, but no quantum error correction, was shown to surpass the direct-transmission capacity. However, this rate still decays exponentially with the end-to-end distance, viz., $R \sim e^{-s{αL}}$, with $s < 1$. We show that the introduction of temporal multiplexing - i.e., the ability to perform BSMs among qubits at a repeater node that were successfully entangled with qubits at distinct neighboring nodes at {\em different} time steps - leads to a sub-exponential rate-vs.-distance scaling, i.e., $R \sim e^{-t\sqrt{αL}}$, which is not attainable with just spatial or spectral multiplexing. We evaluate analytical upper and lower bounds to this rate, and obtain the exact rate by numerically optimizing the time-multiplexing block length and the number of repeater nodes. We further demonstrate that incorporating losses in the optical switches used to implement time multiplexing degrades the rate-vs.-distance performance, eventually falling back to exponential scaling for very lossy switches. We also examine models for quantum memory decoherence and describe optimal regimes of operation to preserve the desired boost from temporal multiplexing. Quantum memory decoherence is seen to be more detrimental to the repeater's performance over switching losses.
description: 13 pages, 11 figures
Optical BVI Imaging and HI Synthesis Observations of the Dwarf Irregular Galaxy ESO 364-G 029
Creators: name: Kouwenhoven, M. B. N.
name: Bureau, M.
name: Kim, S.
name: de Zeeuw, P. T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: As part of an effort to enlarge the number of well-studied Magellanic-type galaxies, we obtained broadband optical imaging and neutral hydrogen radio synthesis observations of the dwarf irregular galaxy ESO 364-G 029. The optical morphology characteristically shows a bar-like main body with a one-sided spiral arm, an approximately exponential light distribution, and offset photometric and kinematic centers. The HI distribution is mildly asymmetric and, although slightly offset from the photometric center, roughly follows the optical brightness distribution, extending to over 1.2 Holmberg radii (where mu_B = 26.5 mag/arcsec^2). In particular, the highest HI column densities closely follow the bar, one-arm spiral, and a third optical extension. The rotation is solid-body in the inner parts but flattens outside of the optical extent. The total HI flux F_HI = 23.1 pm 1.2 Jy km/s, yielding a total HI mass M_HI= (6.4 pm 1.7) x 10^8 Msun (for a distance D = 10.8 pm 1.4 Mpc) and a total HI mass-to-blue-luminosity ratio M_HI/L_B = (0.96 pm 0.14) Msun / Lsun,B (distance independent). The HI data suggest a very complex small-scale HI structure, with evidence of large shells and/or holes, but deeper observations are required for a detailed study. Follow-up observations are also desirable for a proper comparison with the Large Magellanic Cloud, where despite an optical morphology very similar to ESO 364-G 029 the HI bears little resemblance to the optical.
description: 10 pages, 11 figures, accepted by A&A
Consequences of the H-Theorem from Nonlinear Fokker-Planck Equations
Creators: name: Schwammle, Veit
name: Nobre, Fernando D.
name: Curado, Evaldo M. F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A general type of nonlinear Fokker-Planck equation is derived directly from a master equation, by introducing generalized transition rates. The H-theorem is demonstrated for systems that follow those classes of nonlinear Fokker-Planck equations, in the presence of an external potential. For that, a relation involving terms of Fokker-Planck equations and general entropic forms is proposed. It is shown that, at equilibrium, this relation is equivalent to the maximum-entropy principle. Families of Fokker-Planck equations may be related to a single type of entropy, and so, the correspondence between well-known entropic forms and their associated Fokker-Planck equations is explored. It is shown that the Boltzmann-Gibbs entropy, apart from its connection with the standard -- linear Fokker-Planck equation -- may be also related to a family of nonlinear Fokker-Planck equations.
description: 19 pages, no figures
Additional file 1 of Impact of a short-term pharmacy study abroad Program: student outcomes and program evaluation
Creators: name: Elmokadem, Eman Mohamed
name: Mahmoud, Azza A.
name: Bennett-Lenane, Harriet
name: Murphy, Kevin D.
name: Khalil, Noha
Publisher: name: figshare
Year: 2024
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: Science Policy

description: Supplementary Material 1
Are "EIT Waves" Fast-Mode MHD Waves?
Creators: name: Wills-Davey, M. J.
name: DeForest, C. E.
name: Stenflo, J. O.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We examine the nature of large-scale, coronal, propagating wave fronts (``EIT waves'') and find they are incongruous with solutions using fast-mode MHD plane-wave theory. Specifically, we consider the following properties: non-dispersive single pulse manifestions, observed velocities below the local Alfven speed, and different pulses which travel at any number of constant velocities, rather than at the ``predicted'' fast-mode speed. We discuss the possibility of a soliton-like explanation for these phenomena, and show how it is consistent with the above-mentioned aspects.
description: to be published in the Astrophysical Journal
Pesticide Use and Practices, 1982
Creators: name: Duffy, Michael
name: Duffy, Michael
Publisher: name: Unknown
Year: 1983
Subjects: subject: Crop Production/Industries
subject: Farm Management
subject: Livestock Production/Industries
subject: Pesticide use
subject: pest scouting
subject: beneficial insects and diseases
subject: tillage practices
subject: livestock pesticide use
subject: pesticide safety equipment

description: Pesticide use varies considerably by crop, according to the Economic Research Service's 1982 Crop and Livestock Pesticide Usage Survey. Eleven percent of farmers who responded used professional scouting for pest problems, 59 percent self scouted their fields, and 12 percent were aware of beneficial insects and diseases. The extent of no- or reduced-till systems varied by crop. Almost 70 percent of the farmers with livestock used insecticides for livestock insect control. A majority of the respondents used common pesticide application safety equipment and 15 percent used specialized safety equipment.
A fast vectorized sorting implementation based on the ARM scalable vector extension (SVE)
Creators: name: Bramas, Bérenger
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: The way developers implement their algorithms and how these implementations behave on modern CPUs are governed by the design and organization of these. The vectorization units (SIMD) are among the few CPUs' parts that can and must be explicitly controlled. In the HPC community, the x86 CPUs and their vectorization instruction sets were de-facto the standard for decades. Each new release of an instruction set was usually a doubling of the vector length coupled with new operations. Each generation was pushing for adapting and improving previous implementations. The release of the ARM scalable vector extension (SVE) changed things radically for several reasons. First, we expect ARM processors to equip many supercomputers in the next years. Second, SVE's interface is different in several aspects from the x86 extensions as it provides different instructions, uses a predicate to control most operations, and has a vector size that is only known at execution time. Therefore, using SVE opens new challenges on how to adapt algorithms including the ones that are already well-optimized on x86. In this paper, we port a hybrid sort based on the well-known Quicksort and Bitonic-sort algorithms. We use a Bitonic sort to process small partitions/arrays and a vectorized partitioning implementation to divide the partitions. We explain how we use the predicates and how we manage the non-static vector size. We explain how we efficiently implement the sorting kernels. Our approach only needs an array of O(log N) for the recursive calls in the partitioning phase, both in the sequential and in the parallel case. We test the performance of our approach on a modern ARMv8.2 and assess the different layers of our implementation by sorting/partitioning integers, double floating-point numbers, and key/value pairs of integers. Our approach is faster than the GNU C++ sort algorithm by a speedup factor of 4 on average.
description: https://gitlab.inria.fr/bramas/arm-sve-sort https://peerj.com/articles/cs-769/
Hysteresis of spectral evolution in the soft state of black-hole binary LMC X-3
Creators: name: Smith, David M.
name: Dawson, David M.
name: Swank, Jean H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of hysteresis between the x-ray spectrum and luminosity of black-hole binary LMC X-3. Our observations, with the Proportional Counter Array on the Rossi X-ray Timing Explorer, took place entirely within the soft spectral state, dominated by a spectral component that was fitted well with a multicolor disk blackbody. A power-law component was seen only during times when the luminosity of the disk blackbody was declining. The x-ray luminosity at these times was comparable to that seen in transient systems (x-ray novae) when they return to the hard state at the end of an outburst. Our observations may represent partial transitions to the hard state; complete transitions have been seen in this system by Wilms et al. (2001). If they are related to the soft-to-hard transition in transients, then they demonstrate that hysteresis effects can appear without a full state transition. We discuss these observations in the context of earlier observations of hysteresis within the hard state of binaries 1E 1740.7-2942 and GRS 1758-258 and in relation to published explanations of hysteresis in transients.
description: 14 pages, 6 figures, accepted by The Astrophysical Journal
Feasibility Study of Logic Circuits with Spin Wave Bus
Creators: name: Khitun, Alexander
name: Nikonov, Dmitri E.
name: Bao, Mingqiang
name: Galatsis, Kosmas
name: Wang, Kang L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We present a feasibility study of logic circuits utilizing spin waves for information transmission and processing. As an alternative approach to the transistor-based architecture, logic circuits with spin wave bus do not use charge as an information carrier. In this work we describe the general concept of logic circuits with spin wave bus and illustrate its performance by numerical simulations based on available experimental data. Theoretical estimates and results of numerical simulations on signal attenuation, signal phase velocity, and the minimum spin wave energy required per bit in the spin bus are obtained. The transport parameters are compared with ones for conventional electronic transmission lines. Spin Wave Bus is not intended to substitute traditional metal interconnects since it has higher signal attenuation and lower signal propagation speed. The potential value of spin wave bus is, however, an interface between electronic circuits and integrated spintronics circuits. The logic circuits with spin wave bus allow us to provide wireless read-in and read-out.
Utilization of Sewage Sludge Compost as a Soil Conditioner and Fertilizer for Plant Growth
Creators: name: Hornick, S. B.
name: Et Al. [+9]
name: Hornick, S. B.
name: Et Al. [+9]
Publisher: name: Unknown
Year: 1984
Subjects: subject: Crop Production/Industries
subject: Land Economics/Use
subject: Research and Development/Tech Change/Emerging Technologies
subject: Resource /Energy Economics and Policy
subject: Compost
subject: compost application rates
subject: field crops
subject: greenhouse crops
subject: land reclamation
subject: nursery crops and ornamentals
subject: pathogen content
subject: plant growth
subject: root disease control
subject: sewage sludge
subject: sod production
subject: soil conditioner
subject: turfgrass
subject: vegetable crops

description: This bulletin presents information on how sewage sludge compost can be used most effectively. It includes discussions on the properties of sewage sludge compost as a soil conditioner and fertilizer for plant growth and its use on vegetable crops, nursery crops and ornamentals, turfgrasses, field crops, forage grasses, and the reclamation of marginal lands. Recommendations based on laboratory, greenhouse, and field experiments provide methods, limitations, and rates of compost application for different management practices.
Causal Networks and Freedom of Choice in Bell's Theorem
Creators: name: Chaves, Rafael
name: Moreno, George
name: Polino, Emanuele
name: Poderini, Davide
name: Agresti, Iris
name: Suprano, Alessia
name: Barros, Mariana R.
name: Carvacho, Gonzalo
name: Wolfe, Elie
name: Canabarro, Askery
name: Spekkens, Robert W.
name: Sciarrino, Fabio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Machine Learning (stat.ML)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Bell's theorem is typically understood as the proof that quantum theory is incompatible with local-hidden-variable models. More generally, we can see the violation of a Bell inequality as witnessing the impossibility of explaining quantum correlations with classical causal models. The violation of a Bell inequality, however, does not exclude classical models where some level of measurement dependence is allowed, that is, the choice made by observers can be correlated with the source generating the systems to be measured. Here, we show that the level of measurement dependence can be quantitatively upper bounded if we arrange the Bell test within a network. Furthermore, we also prove that these results can be adapted in order to derive nonlinear Bell inequalities for a large class of causal networks and to identify quantumly realizable correlations that violate them.
description: 18 pages, 10 figures. Updated to match published version
Additional file 1 of Combined influence of physical activity and C-reactive protein to albumin ratio on mortality among older cancer survivors in the United States: a prospective cohort study
Creators: name: An, Xiaoqin
name: Li, Jingyi
name: Li, Yuan
name: Liu, Huanxian
name: Bai, Junjun
name: Guo, Qinxiang
name: Jiao, Baoping
Publisher: name: figshare
Year: 2024
Subjects: subject: Medicine
subject: Biotechnology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: Infectious Diseases
subject: FOS: Health sciences

description: Supplementary Material 1
Gluelump spectrum from Coulomb gauge QCD
Creators: name: Guo, Peng
name: Szczepaniak, Adam P.
name: Galata, Giuseppe
name: Vassallo, Andrea
name: Santopinto, Elena
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compute the energy spectrum of gluelumps defined as gluonic excitations bound to a localized, static octet source. We are able to reproduce the nontrivial ordering of the spin-parity levels and show how this is related to the non-abelian part of the Coulomb interaction between color charges.
description: 8 pages, 5 figures
Bayesian learning of thermodynamic integration and numerical convergence for accurate phase diagrams
Creators: name: Ladygin, V.
name: Beniya, I.
name: Makarov, E.
name: Shapeev, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences
subject: J.2; G.3; I.6.5
subject: 37C20 (Primary), 60G15, 62-04 (Secondary)

description: Accurate phase diagram calculation from molecular dynamics requires systematic treatment and convergence of statistical averages. In this work we propose a Gaussian process regression based framework for reconstructing the free energy functions using data of various origin. Our framework allows for propagating statistical uncertainty from finite molecular dynamics trajectories to the phase diagram and automatically performing convergence with respect to simulation parameters. Furthermore, our approach provides a way for automatic optimal sampling in the simulation parameter space based on Bayesian optimization approach. We validate our methodology by constructing phase diagrams of two model systems, the Lennard-Jones and soft-core potential, and compare the results with existing works studies and our coexistence simulations. Finally, we construct the phase diagram of lithium at temperatures above 300 K and pressures below 30 GPa from a machine-learning potential trained on ab initio data. Our approach performs well when compared to coexistence simulations and experimental results.
Motion of an artificial satellite around an asymmetric, rotating celestial body: applications to the solar system
Creators: name: Τζίρτη, Στέλλα Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Βαρυτικό δυναμικό
Τεχνητός δορυφόρος
Σελήνη
Ασύμμετρο ουράνιο σώμα
Gravitational potential
Artificial satellite
Moon
Asymmetric celestial body

description: Η παρούσα διατριβή αφορά στη μελέτη της κίνησης τεχνητού δορυφόρου γύρω από μη συμμετρικό, περιστρεφόμενο ουράνιο σώμα, με έμφαση στη Σελήνη, το δορυφόρο του Δία, Ευρώπη και τον αστεροειδή Εστία. Σκοπός μας είναι η ανάλυση των διαταραχών της τροχιάς ενός τεχνητού δορυφόρου, που προκαλούνται από την ασυμμετρία του βαρυτικού πεδίου του κεντρικού σώματος σε συνδυασμό με την περιστροφή του και πιθανώς την επίδραση τρίτου σώματος (π.χ. της Γης, για δορυφόρους της Σελήνης). Με τη χρήση αναλυτικών και αριθμητικών μεθόδων, «χαρτογραφούμε» το χώρο των φάσεων, υπολογίζοντας τις μεταβολές κάθε τύπου τροχιάς, για χρονικά διαστήματα αντίστοιχα με την τυπική διάρκεια μιας αποστολής επισκόπησης (μερικά έτη). Τα αποτελέσματά μας μπορούν να χρησιμοποιηθούν (α) για τον αποδοτικό σχεδιασμό δορυφορικών τροχιών επισκόπησης και (β) για τον ακριβέστερο υπολογισμό των φυσικών χαρακτηριστικών της Σελήνης και άλλων σωμάτων.
description: In this dissertation we study the motion of artificial satellites around asymmetric and inhomogeneous bodies of our solar system, focusing on satellite orbits around the Moon, the asteroid Vesta and the Jupiter's moon Europa. Our purpose is to analyze the perturbations on a satellite orbit originated in the asymmetries of the gravitational field of the central body. We examine the role of rotation of the main body and also the third body effect (for instance the effect of the Earth for lunar orbiters) on satellite motion. We construct gravity models of different complexity, starting with the relatively simple ones and we gradually develop high degree and order models. Based on them, we are able to predict the time evolution of the satellite orbits and to locate the initial conditions of orbits that keep constant or almost constant some of their characteristics, such as their eccentricity or argument of pericenter. That kind of orbits could be of practical interest as they require minimum passive control. For the global analysis of the phase space and the location of the periodic orbits of the system we propose the use of an efficient Frequency Analysis method that provides fast and accurate results even for high complexity gravitational models.
BigDataGrapes D3.2 - Data Ingestion & Integration Components
Creators: name: Mihalis Papakonstantinou
name: Timotheos Lanitis
name: Stoitshs, Giannis
Publisher: name: Zenodo
Year: 2020

description: This accompanying document for deliverable D3.2 Data Ingestion & Integration Components describes the mechanisms and tools that will be used in the BigDataGrapes platform to ingest data of different nature from multiple sources. Also, the document describes the tools that will be used for data integration across the different BigDataGrapes platform layers, as well as for long-term storage and preservation of data. The document first introduces the big picture of the architecture of the BDG platform and where the ingestion components are positioned. Afterwards, the document describes the different nature of data, and which technologies can be used to facilitate the ingestion process. Then, the data fusion aspect is described, focusing on how the data will be made available across the BigDataGrapes platform, and how the different BigDataGrapes components will communicate with each other, in an effective and fault-tolerant way. Moreover, the document provides documentation links for all the described technologies along with links to tools that facilitate their setup & maintenance. Finally, the document includes links that point to the dockerized versions of the respective tools, as provided by the BigDataEurope (BDE, https://www.big-data-europe.eu/) Project, which is starting point regarding the technical solutions that BigDataGrapes will built upon (as it has ben described in details in the BigDataGrapes DoA).
MS 2053.7-0449: Confirmation of a bimodal mass distribution from strong gravitational lensing
Creators: name: Verdugo, T.
name: de Diego, J. A.
name: Limousin, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the first strong lensing study of the mass distribution in the cluster MS 2053-04 based on HST archive data. This massive, X-ray luminous cluster has a redshift z=0.583, and it is composed of two structures that are gravitationally bound to each other. The cluster has one multiply imaged system constituted by a double gravitational arc. We have performed a parametric strong lensing mass reconstruction using NFW density profiles to model the cluster potential. We also included perturbations from 23 galaxies, modeled like elliptical singular isothermal sphere, that are approximately within 1'x1' around the cluster center. These galaxies were constrained in both the geometric and dynamical parameters with observational data. Our analysis predicts a third image which is slightly demagnified. We found a candidate for this counter-image near the expected position and with the same F702W-F814W colors as the gravitational arcs in the cluster. The results from the strong lensing model shows the complex structure in this cluster, the asymmetry and the elongation in the mass distribution, and are consistent with previous spectrophotometric results that indicate that the cluster has a bimodal mass distribution. Finally, the derived mass profile was used to estimate the mass within the arcs and for comparison with X-ray estimates.
description: To be published in ApJ (accepted)
Accurate retrieval of structural information from laser-induced photoelectron and high-harmonic spectra by few-cycle laser pulses
Creators: name: Morishita, Toru
name: Le, Anh-Thu
name: Chen, Zhangjin
name: Lin, C. D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: By analyzing ``exact'' theoretical results from solving the time-dependent Schrödinger equation of atoms in few-cycle laser pulses, we established the general conclusion that differential elastic scattering and photo-recombination cross sections of the target ion with {\em free} electrons can be extracted accurately from laser-generated high-energy electron momentum spectra and high-order harmonic spectra, respectively. Since both electron scattering and photoionization (the inverse of photo-recombination) are the conventional means for interrogating the structure of atoms and molecules, this result shows that existing few-cycle infrared lasers can be implemented for ultrafast imaging of transient molecules with temporal resolution of a few femtoseconds.
description: 4 pages, 4 figures
Quasiparticle mirages in the tunneling spectra of d-wave superconductors
Creators: name: Paul, I.
name: Klironomos, A. D.
name: Norman, M. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We illustrate the importance of many-body effects in the Fourier transformed local density of states (FT-LDOS) of d-wave superconductors from a model of electrons coupled to an Einstein mode with energy Omega_0. For bias energies significantly larger than Omega_0 the quasiparticles have short lifetimes due to this coupling, and the FT-LDOS is featureless if the electron-impurity scattering is treated within the Born approximation. In this regime it is important to include boson exchange for the electron-impurity scattering which provides a `step down' in energy for the electrons and allows for long lifetimes. This many-body effect produces qualitatively different results, namely the presence of peaks in the FT-LDOS which are mirrors of the quasiparticle interference peaks which occur at bias energies smaller than ~ Omega_0. The experimental observation of these quasiparticle mirages would be an important step forward in elucidating the role of many-body effects in FT-LDOS measurements.
description: revised text with new figures, to be published, Phys Rev B
Phase-Space Function Recovery for Moving Target Imaging in SAR by Convex Optimization
Creators: name: Thammakhoune, Sean
name: Yonel, Bariscan
name: Mason, Eric
name: Yazici, Birsen
name: Eldar, Yonina C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we present an approach for ground moving target imaging (GMTI) and velocity recovery using synthetic aperture radar. We formulate the GMTI problem as the recovery of a phase-space reflectivity (PSR) function which represents the strengths and velocities of the scatterers in a scene of interest. We show that the discretized PSR matrix can be decomposed into a rank-one, and a highly sparse component corresponding to the stationary and moving scatterers, respectively. We then recover the two distinct components by solving a constrained optimization problem that admits computationally efficient convex solvers within the proximal gradient descent and alternating direction method of multipliers frameworks. Using the structural properties of the PSR matrix, we alleviate the computationally expensive steps associated with rank-constraints, such as singular value thresholding. Our optimization-based approach has several advantages over state-of-the-art GMTI methods, including computational efficiency, applicability to dense target environments, and arbitrary imaging configurations. We present extensive simulations to assess the robustness of our approach to both additive noise and clutter, with increasing number of moving targets. We show that both solvers perform well in dense moving target environments, and low-signal-to-clutter ratios without the need for additional clutter suppression techniques.
description: Submitted to IEEE Transactions on Computational Imaging
Random Walks in Random Environments
Creators: name: Bogachev, L. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60K37, 82D30

description: Random walks provide a simple conventional model to describe various transport processes, for example propagation of heat or diffusion of matter through a medium. However, in many practical cases the medium is highly irregular due to defects, impurities, fluctuations etc., and it is natural to model this as random environment. In the random walks context, such models are referred to as Random Walks in Random Environments (RWRE). This is a relatively new chapter in applied probability and physics of disordered systems, initiated in the 1970s. Early interest was motivated by some problems in biology, crystallography and metal physics, but later applications have spread through numerous areas. After 30 years of extensive work, RWRE remain a very active area of research, which has already led to many surprising discoveries. The goal of this article is to give a brief introduction to the beautiful area of RWRE. The principal model to be discussed is a random walk with nearest-neighbor jumps in independent identically distributed (i.i.d.) random environment in one dimension, although we shall also comment on some extensions and generalizations. The focus is on rigorous results; however, heuristics is used freely to motivate the ideas and explain the approaches and proofs. In a few cases, sketches of the proofs have been included, which should help the reader to appreciate the flavor of results and methods.
description: A review article in the Encyclopedia of Mathematical Physics (Elsevier, 2006). http://www.elsevier.com/wps/find/bookdescription.cws_home/705128/description
Additional file 1 of CALB2 drives pancreatic cancer metastasis through inflammatory reprogramming of the tumor microenvironment
Creators: name: Tao, Jinxin
name: Gu, Yani
name: Zhang, Zeyu
name: Weng, Guihu
name: Liu, Yueze
name: Ren, Jie
name: Shi, Yanan
name: Qiu, Jiangdong
name: Wang, Yuanyang
name: Su, Dan
name: Wang, Ruobing
name: Fu, Yifan
name: Liu, Tao
name: Ye, Liyuan
name: Luo, Wenhao
name: Chen, Hao
name: Yang, Gang
name: Cao, Zhe
name: Huang, Hua
name: Xiao, Jianchun
name: Ren, Bo
name: You, Lei
name: Zhang, Taiping
name: Zhao, Yupei
Publisher: name: figshare
Year: 2024
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer

description: Supplementary Material 1.
The remarkable X-ray spectrum of the Broad-Line Radio Galaxy 3C 445
Creators: name: Sambruna, R. M.
name: Reeves, J. N.
name: Braito, V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of the analysis of an archival 15 ks XMM-Newton observation of the nearby (z=0.057) radio-loud source 3C445, optically classified as a Broad-Line Radio Galaxy. While the RGS data are of insufficient quality to allow a meaningful analysis, the EPIC data show a remarkable X-ray spectrum. The 2-10 keV continuum is described by a heavily absorbed (Nh~ 1e22 - 1e23 cm-2) power law with photon index Gamma ~1.4, and strong (R~2) cold reflection. A narrow, unresolved Fe Kalpha emission line is detected, confirming previous findings, with EW 120eV. A soft excess is present below 2 keV over the extrapolation of the hard X-ray power law, which we model with a power law with the same photon index as the hard power law, absorbed by a column density Nh=6e20 cm-2 in excess to Galactic. A host of emission lines are present below 2 keV, confirming previous indications from ASCA, due to H- and He-like O, Mg, and Si. We attribute the origin of the lines to a photoionized gas, with properties very similar to radio-quiet obscured AGN. Two different ionized media, or a single stratified medium, are required to fit the soft X-ray data satisfactorily. The similarity of the X-ray spectrum of 3C445 to Seyferts underscores that the central engines of radio-loud and radio-quiet AGN similarly host both cold and warm gas.
description: 32 pages, 3 figures, 2 tables, accepted for publication in ApJ
BigDataGrapes D3.3 - Distributed Indexing Components
Creators: name: Venturini, Rossano
name: Pibiri, Giulio Ermanno
name: Perego, Raffaele
Publisher: name: Zenodo
Year: 2020

description: The BigDataGrapes (BDG) platform aspires to provide components that go beyond the state-of-the-art on various stages of the management, processing, and usage of grapevine-related big data assets thus making easier for grapevine-powered industries to take important business decisions. The platform employs the necessary components for carrying out rigorous analytics processes on complex and heterogeneous data helping companies and organizations in the sector to evolve methods, standards and processes based on insights extracted from their data. The goal of the BDG Distributed Indexing activity is to develop novel methodologies and components for realizing efficient indexing over distributed, heterogeneous big data batch and cross-streaming sources. The activities carried out in this activity focus on the design of time and space efficient indexing data structures for structured and unstructured data such as RDF graphs, time series and text documents, including compression techniques for Big data management that support a broad range of analytical queries over arbitrary data dimensions. Specifically, we investigate the efficiency and effectiveness dimensions of indexes for texts, RDF triples, and time-series. This investigation led us to develop two novel techniques based on inverted indexes and succinct tries. These solutions substantially outperform competitive approaches at the state-of-the-art. Both these scientific results have been already published in Transactions on Knowledge and Data Engineering (TKDE)(Pibiri & Venturini 2019b; Perego, Pibiri & Venturini 2020) — a top-tier journal in Computer Science. We believe that the above project results will have a high impact for both the project partners and the scientific community working in the field. A third contribution on indexing time-series has been added to the last update of the deliverable due at M30. The software solution discussed is still under development but the encouraging results achieved so far lead us to believe that the solution designed will be very useful and impactful for the project and the community. Moreover, a top-tier publication is planned even for this project result. This deliverable describes the software components developed and discusses the promising results obtained. An appendix shows how to access the software, install it and reproduce the tests conducted.
The Subaru/XMM-Newton Deep Survey (SXDS). IV. Evolution of Lya Emitters from z=3.1 to 5.7 in the 1 deg^2 Field: Luminosity Functions and AGN
Creators: name: Ouchi, Masami
name: Shimasaku, Kazuhiro
name: Akiyama, Masayuki
name: Simpson, Chris
name: Saito, Tomoki
name: Ueda, Yoshihiro
name: Furusawa, Hisanori
name: Sekiguchi, Kazuhiro
name: Yamada, Toru
name: Kodama, Tadayuki
name: Kashikawa, Nobunari
name: Okamura, Sadanori
name: Iye, Masanori
name: Takata, Tadafumi
name: Yoshida, Michitoshi
name: Yoshida, Makiko
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present luminosity functions (LFs) and various properties of Lya emitters (LAEs) at z=3.1, 3.7, and 5.7, in a 1 deg^2 sky of the Subaru/XMM-Newton Deep Survey (SXDS) Field. We obtain a photometric sample of 858 LAE candidates based on deep Subaru/Suprime-Cam imaging data, and a spectroscopic sample of 84 confirmed LAEs from Subaru/FOCAS and VLT/VIMOS spectroscopy in a survey volume of ~10^6 Mpc^3 with a limiting Lya luminosity of ~3x10^42 erg/s. We derive the LFs of Lya and UV-continuum (~1500 Å) for each redshift, taking into account the statistical error and the field-to-field variation. We find that the apparent Lya LF shows no significant evolution between z=3.1 and 5.7 within factors of 1.8 and 2.7 in L* and phi*, respectively. On the other hand, the UV LF of LAEs increases from z=3.1 to 5.7, indicating that galaxies with Lya emission are more common at earlier epochs. We identify six LAEs with AGN activities from our spectra combined with VLA, Spitzer, and XMM-Newton data. Among the photometrically selected LAEs at z=3.1 and 3.7, only ~1 % show AGN activities, while the brightest LAEs with logL(Lya) >~ 43.4-43.6 erg/s appear to always host AGNs. Our LAEs are bluer in UV-continuum color than dropout galaxies, suggesting lower extinction and/or younger stellar populations. Our stacking analyses provide upper limits to the radio luminosity and the f(HeII)/f(Lya) line fraction, and constrain the hidden star formation (+low-luminosity AGN) and the primordial population in LAEs.
description: 75 pages, 27 figures; ApJS in press. High resolution version at http://www.ociw.edu/~ouchi/work/astroph/sxds_LAEs/ouchi_SXDSLAE_ApJS.pdf
Additional file 2 of CALB2 drives pancreatic cancer metastasis through inflammatory reprogramming of the tumor microenvironment
Creators: name: Tao, Jinxin
name: Gu, Yani
name: Zhang, Zeyu
name: Weng, Guihu
name: Liu, Yueze
name: Ren, Jie
name: Shi, Yanan
name: Qiu, Jiangdong
name: Wang, Yuanyang
name: Su, Dan
name: Wang, Ruobing
name: Fu, Yifan
name: Liu, Tao
name: Ye, Liyuan
name: Luo, Wenhao
name: Chen, Hao
name: Yang, Gang
name: Cao, Zhe
name: Huang, Hua
name: Xiao, Jianchun
name: Ren, Bo
name: You, Lei
name: Zhang, Taiping
name: Zhao, Yupei
Publisher: name: figshare
Year: 2024
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer

description: Supplementary Material 2.
A GPU-based Kalman Filter for Track Fitting
Creators: name: Ai, Xiaocong
name: Mania, Georgiana
name: Gray, Heather M.
name: Kuhn, Michael
name: Styles, Nicholas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Computing centres, including those used to process High-Energy Physics data and simulations, are increasingly providing significant fractions of their computing resources through hardware architectures other than x86 CPUs, with GPUs being a common alternative. GPUs can provide excellent computational performance at a good price point for tasks that can be suitably parallelized. Charged particle (track) reconstruction is a computationally expensive component of HEP data reconstruction, and thus needs to use available resources in an efficient way. In this paper, an implementation of Kalman filter-based track fitting using CUDA and running on GPUs is presented. This utilizes the ACTS (A Common Tracking Software) toolkit; an open source and experiment-independent toolkit for track reconstruction. The implementation details and parallelization approach are described, along with the specific challenges for such an implementation. Detailed performance benchmarking results are discussed, which show encouraging performance gains over a CPU-based implementation for representative configurations. Finally, a perspective on the challenges and future directions for these studies is outlined. These include more complex and realistic scenarios which can be studied, and anticipated developments to software frameworks and standards which may open up possibilities for greater flexibility and improved performance.
description: 15 pages, 17 figures