cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Rapport de campagne en mer - Expédition Vigieplastic 2021
Creators: name: Frère Laura
name: Expédition MED
Publisher: name: Zenodo
Year: 2021
Subjects: microplastiques
surface
Mer Méditerranée
concentration
Manta
caractérisation morphologique
sciences participatives

description: Expédition MED est une association rassemblant un collectif de scientifiques, d’environnementalistes et de citoyens européens qui, depuis 2009, réalise des programmes de recherches scientifiques et participatifs en Méditerranée tout en menant également des actions pour la mise en place de solutions durables pour lutter contre la pollution par les matières plastiques. Elle initie également des campagnes de sensibilisation avec la réalisation d’expositions pédagogiques et scientifiques itinérantes sur cette pollution.
 Face à l’urgence des enjeux et impacts de la pollution plastique sur les mers et océans, Expédition MED initie une expédition inédite sur l'ensemble du bassin Méditerranéen : Vigieplastic Méditerranée. L’identification et la mesure de la pollution plastique peut permettre de proposer des solutions communes et adaptées entre les pays du littoral méditerranéen tout en renforçant les coopérations pour la sauvegarde de cet écosystème fragile qui nous concerne tous.
 Le programme « Vigieplastic Méditerranée » vise à promouvoir une approche régionale commune sur la connaissance de la pollution plastique en Méditerranée. Il propose une approche inédite scientifique et participative, par la collecte des données sur l’ensemble du bassin méditerranéen. Ce programme propose également une approche éducative, en sensibilisant et mobilisant les populations des pays riverains de la Méditerranée sur les enjeux des déchets plastiques en mer, à partir de données validées par la communauté scientifique.
 L'objectif principal de ce programme est de diffuser à grande échelle les connaissances autour des enjeux de la pollution par les déchets plastiques auprès de l'ensemble des populations du bassin Méditerranéen.
 L'intérêt de mettre en place des actions communes entre les pays riverains autour
 de cette cause est d'essayer d'améliorer la qualité des eaux, en endiguant le rejet de plastiques dans l'environnement.
 La campagne 2021 s’appuiera sur le nouveau programme de recherche scientifique et participatif du laboratoire citoyen d’Expédition MED, « Vigieplastic Méditerranée ». La mission va contribuer à une meilleure connaissance de la pollution plastique en Méditerranée à l’aide de nouveaux protocoles scientifiques. Cette expédition s’est déroulée dans le bassin Nord Occidental Méditerranéen du 22 juillet au départ de Fiumicino (Rome) et à destination de Marseille le 3 septembre avec le nouveau bateau de l’association « Le Bonita».
 La mission a embarqué durant les sept semaines de la campagne une soixantaine de personnes composée de marins, de scientifiques, d’environnementalistes, d’éco-volontaires qui vont contribuer à une meilleure connaissance de la pollution plastique pour la sauvegarde des écosystèmes marins en Méditerranée.
Lifted Variable Elimination for Probabilistic Logic Programming
Creators: name: Bellodi, Elena
name: Lamma, Evelina
name: Riguzzi, Fabrizio
name: Costa, Vitor Santos
name: Zese, Riccardo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Lifted inference has been proposed for various probabilistic logical frameworks in order to compute the probability of queries in a time that depends on the size of the domains of the random variables rather than the number of instances. Even if various authors have underlined its importance for probabilistic logic programming (PLP), lifted inference has been applied up to now only to relational languages outside of logic programming. In this paper we adapt Generalized Counting First Order Variable Elimination (GC-FOVE) to the problem of computing the probability of queries to probabilistic logic programs under the distribution semantics. In particular, we extend the Prolog Factor Language (PFL) to include two new types of factors that are needed for representing ProbLog programs. These factors take into account the existing causal independence relationships among random variables and are managed by the extension to variable elimination proposed by Zhang and Poole for dealing with convergent variables and heterogeneous factors. Two new operators are added to GC-FOVE for treating heterogeneous factors. The resulting algorithm, called LP$^2$ for Lifted Probabilistic Logic Programming, has been implemented by modifying the PFL implementation of GC-FOVE and tested on three benchmarks for lifted inference. A comparison with PITA and ProbLog2 shows the potential of the approach.
description: To appear in Theory and Practice of Logic Programming (TPLP). arXiv admin note: text overlap with arXiv:1402.0565 by other authors
O'ZBEKISTON RESPUBLIKASINING QO'SHNI DAVLATLAR BILAN CHEGARA MASALALARI
Creators: name: Abdullayev, Xaitboy
name: Abdurayimov, Qudrat
Publisher: name: Zenodo
Year: 2023

description: O'zbekiston Respublikasi mustaqillika erishganidan so'ng, qo'shni davlatlar va xamdo'st xalqlar bilan yaxshi munosabatda bo'lishga harakat qildi. Davlatlar o'rtasida vujudga kelgan bahs-munozarali holatlarda bir-birining manfaatlari hisobga olingan holda,kuchishlatmar siyosat yurtildi. Ko'pgina muamoli masalalar o'z yechimini topdi,lekin chegara masalalari hali hamon dolzarbligicha qolmoqda.Bu kabi muamolarni hal qilish uchun davlatimizning birinchi prezidenti bo'lmush Islom Abdug'aniyevich Karimov ko'plab ishlar qilgan edi. Joriy yurtboshimiz Shavkat Miromonivich Mirziyoyev  ham mazkur  muamolarga alternariv yechim bo'luvchi islohotlarni olib bormoqda.Ammo muamollar o'zining to'liq yechimiga erisha olmadi.Ushbu tezisda qo'shni davlatlar bilan kelishilgan va imzolangan chegara shartnomalarning mazun-mohiyati  va ahamiyati ochib beriladi.
Gravitational lensing in Tangherlini spacetime in the weak gravitational field and the strong gravitational field
Creators: name: Tsukamoto, Naoki
name: Kitamura, Takao
name: Nakajima, Koki
name: Asada, Hideki
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The gravitational lensing effects in the weak gravitational field by exotic lenses have been investigated intensively to find nonluminous exotic objects. Gravitational lensing based on 1/r^n fall-off metric, as a one-parameter model that can treat by hand both the Schwarzschild lens (n=1) and the Ellis wormhole (n=2) in the weak field, has been recently studied. Only for n=1 case, however, it has been explicitly shown that effects of relativistic lens images by the strong field on the light curve can be neglected. We discuss whether relativistic images by the strong field can be neglected for n>1 in the Tangherlini spacetime which is one of the simplest models for our purpose. We calculate the divergent part of the deflection angle for arbitrary n and the regular part for n=1, 2 and 4 in the strong field limit, the deflection angle for arbitrary n under the weak gravitational approximation. We also compare the radius of the Einstein ring with the radii of the relativistic Einstein rings for arbitrary n. We conclude that the images in the strong gravitational field have little effect on the total light curve and that the time-symmetric demagnification parts in the light curve will appear even after taking account of the images in the strong gravitational field for n>1.
description: 10 pages, 2 figures, minor correction, accepted for publication in Physical Review D
Tunable rotons in square lattice antiferromagnets under strong magnetic fields
Creators: name: Kubo, Yurika
name: Kurihara, Susumu
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Excitation spectra of square lattice Heisenberg antiferromagnets in magnetic fields are investigated by the spin-wave theory. It is pointed out that a rotonlike structure appears in a narrow range of magnetic fields, as a result of strong nonlinear effects. It is shown that the energy gap and the mass of the "roton" are quite sensitive to the magnetic field: the roton gap softens rapidly and eventually closes as a precursor of a quantum phase transition. The possibility of the experimental observation of the roton and a new ground state after its softening are discussed.
description: 9 pages, 6 figures
Chemical characterisation of combustion engine exhaust and assessment of helicopter deck operator occupational exposures on an offshore frigate class ship
Creators: name: Hammer, Stine Eriksen
name: Daae, Hanne Line
name: Kåsin, Karoline
name: Helmersmo, Kristin
name: Simensen, Vincent
name: Skaugset, Nils Petter
name: Hassel, Erlend
name: Zardin, Erika
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Pharmacology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified

description: Diesel engine exhaust (DE) consists of a complex mixture of gases and aerosols, originating from sources such as engines, turbines, and power generators. It is composed of a wide range of toxic compounds ranging from constituents that are irritating to those that are carcinogenic. The purposes of this work were to characterise DE originating from different engine types on a ship operating offshore, and to quantify the potential exposure of workers on the ship’s helicopter deck to select DE compounds. Sampling was conducted on a Norwegian Nansen-class frigate that included helicopter operations. Frigate engines and generators were fueled by marine diesel oil, while the helicopter engine was fueled by high flash point kerosene-type aviation fuel. Exhaust samples were collected directly from the stack of the diesel engine and one of the diesel generator exhaust stacks, inside a gas turbine exhaust stack, and at the exhaust outlet of the helicopter. To characterise the different exhausts sources, non-targeted screening of volatile and semi-volatile organic compounds was performed for multiple chemical classes. Some of the compounds detected at the sources are known irritants, such as: phthalic anhydride, 2,5-dyphenyl-p-benzoquinone, styrene, cinnoline, and phenyl maleic anhydride. The exhaust from the diesel engine and diesel generator were found to contain the highest amounts of particulate matter and gaseous compounds, while the gas turbine had the lowest emissions. Personal exposure samples were collected outdoors in the breathing zone of a helicopter deck operator over nine working shifts, simultaneously with stationary measurements on the helicopter deck. Elemental carbon, nitrogen dioxide, and several volatile organic compounds known to be present in DE, such as formaldehyde, acrolein and phenol were specifically targeted. Measured DE exposures of the crew on the helicopter deck were variable, but less than the current European occupational exposure limits for all compounds, except elemental carbon, in which concentration varied between 0.5 to 37 µg/m3 over nine work shifts. These findings are among the first published for this type of working environment.
Anomalous nonequilibrium current fluctuations in the Heisenberg model
Creators: name: Znidaric, Marko
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study fluctuation properties of a one-dimensional anisotropic Heisenberg model out of equilibrium, focusing in particular on the gapped regime. Within the open-system setting we study large-deviation properties of the spin current. Numerically evaluating the first four current cumulants in a nonequilibrium stationary state at high energies, we find that the first two cumulants scale with the system size in a diffusive way, while the 3rd and the 4th cumulants do not. This means that the model is not an ordinary diffusive spin conductor.
description: 5 pages, 5 figs; v2.: some additional explanation and one new fig
Energetic competition in the complexation affinity of paracetamol with water and oxalic acid
Creators: name: Studinger, Amanda
name: Valenzano-Slough, Loredana
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified

description: The intermolecular interactions of active pharmaceutical ingredients (APIs) are the driving forces of API molecular activity and stability, in vivo receptor binding, environmental transport, and persistence. In manufacturing, API complexation with another molecule to create stable crystalline structures is pursued, but the formation of more energetically stable complexes can lead to undesired consequences. Density functional theory (DFT) was used to describe the role played by hydrogen bonding in the formation of paracetamol and oxalic acid (PCA-OXA) complexes. PCA-OXA hydrogen bonding sites were investigated to determine strength and overall contribution/competition during the initial stages of the nucleation process. Structural and energetic changes were evaluated for 1:1 PCA-OXA, PCA-Water, and OXA-Water complexes both in vacuum and in water environments via explicit and implicit solvation. Results show significant shortening of the hydrogen bonds within the PCA-OXA complex with large changes in energy in the PCA-OXA complexation mechanism. Two out of the four complexation sites play the largest roles in the initial steps of the nucleation process. In an aqueous environment, little to no energetic competition for PCA hydrogen bonds formation with other molecules is observed. Post Hartree–Fock methods (MP2 and CCSD) were used to calibrate and verify the DFT results.
Chiral spin liquid in a frustrated anisotropic kagome Heisenberg model
Creators: name: He, Yin-Chen
name: Sheng, D. N.
name: Chen, Yan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Kalmeyer-Laughlin (KL) chiral spin liquid (CSL) is a type of quantum spin liquid without time-reversal symmetry, and it is considered as the parent state of an exotic type of superconductivity--anyon superconductor. Such exotic state has been sought for more than twenty years, however it remains unclear whether it can exist in realistic system where time-reversal symmetry is breaking (T-breaking) spontaneously. By using the density matrix renormalization group, we show that KL CSL exists in a frustrated anisotropic kagome Heisenberg model (KHM), which has spontaneously T-breaking. We find that our model has two topological degenerate ground states, which exhibit non-vanishing scalar chirality order and are protected by finite excitation gap. Further, we identify this state as KL CSL by the characteristic edge conformal field theory from the entanglement spectrum and the quasiparticles braiding statistics extracted from the modular matrix. We also study how this CSL phase evolves as the system approaches the nearest neighbor KHM.
description: 5+2 pages
Binding potentials and interaction gates between microwave-dressed Rydberg atoms
Creators: name: Petrosyan, David
name: Mølmer, Klaus
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We demonstrate finite range binding potentials between pairs of Rydberg atoms interacting with each other via attractive and repulsive van der Waals potentials and driven by a microwave field. We show that, using destructive quantum interference to cancel single-atom Rydberg excitation, the Rydberg-dimer states can be selectively and coherently populated from the two-atom ground state. This can be used to realize a two-qubit interaction gate which is not susceptible to mechanical forces between the atoms and is therefore immune to motional decoherence.
description: Updated, close to published version
Designing and recasting LHC analyses with MadAnalysis 5
Creators: name: Conte, Eric
name: Dumont, Béranger
name: Fuks, Benjamin
name: Wymant, Chris
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present an extension of the expert mode of the MadAnalysis 5 program dedicated to the design or reinterpretation of high-energy physics collider analyses. We detail the predefined classes, functions and methods available to the user and emphasize the most recent developments. The latter include the possible definition of multiple sub-analyses and a novel user-friendly treatment for the selection criteria. We illustrate this approach by two concrete examples: a CMS search for supersymmetric partners of the top quark and a phenomenological analysis targeting hadronically decaying monotop systems.
description: 17 pages, 3 figures, 10 tables; version accepted by EPJC
title: Sarcopenia on preoperative chest computed tomography predicts cancer-specific and all-cause mortality following pneumonectomy for lung cancer: A multicenter analysis
Creators: name: Troschel, Fabian Martin
name: Jin, Qianna
name: Eichhorn, Florian
name: Muley, Thomas
name: Best, Till D.
name: Leppelmann, Konstantin S.
name: Yang, Chi-Fu Jeffrey
name: Troschel, Amelie Sarah
name: Winter, Hauke
name: Heußel, Claus Peter
name: Gaissert, Henning A.
name: Fintelmann, Florian J.
Publisher: name: University of Muenster, Institutional Repository MIAMI
Year: 2023
Subjects: subject: 610 Medicine and health

description: Background: Mortality risk prediction in patients undergoing pneumonectomy for non-small cell lung cancer (NSCLC) remains imperfect. Here, we aimed to assess whether sarcopenia on routine chest computed tomography (CT) independently predicts worse cancer-specific (CSS) and overall survival (OS) following pneumonectomy for NSCLC. Methods: We included consecutive adults undergoing standard or carinal pneumonectomy for NSCLC at Massachusetts General Hospital and Heidelberg University from 2010 to 2018. We measured muscle cross-sectional area (CSA) on CT at thoracic vertebral levels T8, T10, and T12 within 90 days prior to surgery. Sarcopenia was defined as T10 muscle CSA less than two standard deviations below the mean in healthy controls. We adjusted time-to-event analyses for age, body mass index, Charlson Comorbidity Index, forced expiratory volume in 1 second in % predicted, induction therapy, sex, smoking status, tumor stage, side of pneumonectomy, and institution. Results: Three hundred and sixty-seven patients (67.4% male, median age 62 years, 16.9% early-stage) underwent predominantly standard pneumonectomy (89.6%) for stage IIIA NSCLC (45.5%) and squamous cell histology (58%). Sarcopenia was present in 104 of 367 patients (28.3%). Ninety-day all-cause mortality was 7.1% (26/367). After a median follow-up of 20.5 months (IQR, 9.2–46.9), 183 of 367 patients (49.9%) had died. One hundred and thirty-three (72.7%) of these deaths were due to lung cancer. Sarcopenia was associated with shorter CSS (HR 1.7, p = 0.008) and OS (HR 1.7, p = 0.003). Conclusions: This transatlantic multicenter study confirms that sarcopenia on preoperative chest CT is an independent risk factor for CSS and OS following pneumonectomy for NSCLC.
description: Finanziert über die DEAL-Vereinbarung mit Wiley 2019-2022.
Snapshot spectrum and critical phenomenon for two-dimensional classical spin systems
Creators: name: Imura, Yukinari
name: Okubo, Tsuyoshi
name: Morita, Satoshi
name: Okunishi, Kouichi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate the eigenvalue distribution of the snapshot density matrix (SDM) generated by Monte Carlo simulation for two-dimensional classical spin systems. We find that the distribution in the high-temperature limit is well explained by the random-matrix theory, while that in the low-temperature limit can be characterized by the zero-eigenvalue condensation. At the critical point, we obtain the power-law distribution with a nontrivial exponent $α\equiv(2-η)/(1-η)$ and the asymptotic form of the snapshot entropy, on the basis of the relationship of the SDM with the correlation function matrix. The aspect-ratio dependence of the SDM spectrum is also mentioned.
description: 8 pages, typos fixed, to appear in J. Phys. Soc. Jpn
On incorporating post-Newtonian effects in N-body dynamics
Creators: name: Will, Clifford M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The increasing role of general relativity in the dynamics of stellar systems with central massive black holes and in the evolution of hierarchical triple systems inspires a close examination of how post-Newtonian effects are incorporated into N-body dynamics. The majority of approaches incorporate relativity by adding to the Newtonian N-body equations the standard two-body post-Newtonian terms for a given star around the black hole or for the close binary in a triple system. We argue that, for calculating the evolution of such systems over timescales comparable to the relativistic pericenter advance timescale, it is essential to include "cross terms" in the equations of motion. These are post-Newtonian terms that represent a coupling between the potential of the central black hole and the potential due to other stars in the system. For hierarchical triple systems, these are couplings between the potential of the inner binary and that of the distant third body. Over pericenter precession timescales, the effects of such terms can actually be "boosted" to amplitudes of Newtonian order. We write down the post-Newtonian N-body equations of motion including a central black hole in a truncated form that includes all the relevant cross terms, in a format ready to use for numerical implementation. We do the same for hierarchical triple systems, and illustrate explicitly the effects of cross terms on the orbit-averaged equations of evolution for the orbit elements of the inner binary for the special case where the third body is on a circular orbit. We also describe the inspiration for this investigation: the motion of a test body about a central body with a Newtonian quadrupole moment, including the relativistic pericenter advance, whose correct solution for the conserved total Newtonian energy requires including PN cross terms between the mass monopole and quadrupole potentials.
description: 15 pages, added discussion and references, version accepted by Phys. Rev. D
AKADEMIK PROKRASTINATSIYA: YOSH RAHBARLARNING MUAMMOSI YOKI TURMUSH TARZI
Creators: name: Arifxodjayeva, Luiza
Publisher: name: Zenodo
Year: 2023

description: Mazkur maqolada yosh rahbarlarda akademik prokrastinatsiya holatiga tushush muammosi va ijtimoiy hayotda uchrashi haqida fikr-mulohazalar yuritilgan.
Cauchy's almost forgotten Lagrangian formulation of the Euler equation for 3D incompressible flow
Creators: name: Frisch, Uriel
name: Villone, Barbara
Publisher: name: arXiv
Year: 2014
Subjects: subject: History and Overview (math.HO)
subject: Analysis of PDEs (math.AP)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Two prized papers, one by Augustin Cauchy in 1815, presented to the French Academy and the other by Hermann Hankel in 1861, presented to Göttingen University, contain major discoveries on vorticity dynamics whose impact is now quickly increasing. Cauchy found a Lagrangian formulation of 3D ideal incompressible flow in terms of three invariants that generalize to three dimensions the now well-known law of conservation of vorticity along fluid particle trajectories for two-dimensional flow. This has very recently been used to prove analyticity in time of fluid particle trajectories for 3D incompressible Euler flow and can be extended to compressible flow, in particular to cosmological dark matter. Hankel showed that Cauchy's formulation gives a very simple Lagrangian derivation of the Helmholtz vorticity-flux invariants and, in the middle of the proof, derived an intermediate result which is the conservation of the circulation of the velocity around a closed contour moving with the fluid. This circulation theorem was to be rediscovered independently by William Thomson (Kelvin) in 1869. Cauchy's invariants were only occasionally cited in the 19th century --- besides Hankel, foremost by George Stokes and Maurice Lévy --- and even less so in the 20th until they were rediscovered via Emmy Noether's theorem in the late 1960, but reattributed to Cauchy only at the end of the 20th century by Russian scientists.
description: 23 pages, 6 figures, EPJ H (history), in press
Classification of Boundary Gravitons in AdS$_3$ Gravity
Creators: name: Garbarz, Alan
name: Leston, Mauricio
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We revisit the description of the space of asymptotically AdS3 solutions of pure gravity in three dimensions with a negative cosmological constant as a collection of coadjoint orbits of the Virasoro group. Each orbit corresponds to a set of metrics related by diffeomorphisms which do not approach the identity fast enough at the boundary. Orbits contain more than a single element and this fact manifests the global degrees of freedom of AdS3 gravity, being each element of an orbit what we call boundary graviton. We show how this setup allows to learn features about the classical phase space that otherwise would be quite difficult. Most important are the proof of energy bounds and the characterization of boundary gravitons unrelated to BTZs and AdS3. In addition, it makes manifest the underlying mathematical structure of the space of solutions close to infinity. Notably, because of the existence of a symplectic form in each orbit, being this related with the usual Dirac bracket of the asymptotic charges, this approach is a natural starting point for the quantization of different sectors of AdS3 gravity. We finally discuss previous attempts to quantize coadjoint orbits of the Virasoro group and how this is relevant for the formulation of AdS3 quantum gravity.
description: 29 pages. Minor corrections. References added. Published version in JHEP
Reference Receiver Based Digital Self-Interference Cancellation in MIMO Full-Duplex Transceivers
Creators: name: Korpi, Dani
name: Anttila, Lauri
name: Valkama, Mikko
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper we propose and analyze a novel self-interference cancellation structure for in-band MIMO full-duplex transceivers. The proposed structure utilizes reference receiver chains to obtain reference signals for digital self-interference cancellation, which means that all the transmitter-induced nonidealities will be included in the digital cancellation signal. To the best of our knowledge, this type of a structure has not been discussed before in the context of full-duplex transceivers. First, we will analyze the overall achievable performance of the proposed cancellation scheme, while also providing some insight into the possible bottlenecks. We also provide a detailed formulation of the actual cancellation procedure, and perform an analysis into the effect of the received signal of interest on self-interference coupling channel estimation. The achieved performance of the proposed reference receiver based digital cancellation procedure is then assessed and verified with full waveform simulations. The analysis and waveform simulation results show that under practical transmitter RF/analog impairment levels, the proposed reference receiver based cancellation architecture can provide substantially better self-interference suppression than any existing solution, despite deploying only low-complexity linear digital processing.
description: 7 pages, 4 figures. To be presented in the 2014 IEEE Broadband Wireless Access Workshop
Integrating Paleodistribution Models and Phylogeography in the Grass-Cutting Ant Acromyrmex striatus (Hymenoptera: Formicidae) in Southern Lowlands of South America
Creators: name: Cristiano, Maykon Passos
name: Cardoso, Danon Clemens
name: Fernandes-Salomão, Tânia Maria
name: Heinze, Jürgen
Publisher: name: Universität Regensburg
Year: 2016
Subjects: subject: BRAZILIAN ATLANTIC FOREST; SPECIES GEOGRAPHIC DISTRIBUTIONS; GENETIC-STRUCTURE; PHYLOGENETIC ANALYSIS; DNA POLYMORPHISM; LATE QUATERNARY; RAIN-FOREST; DIVERSITY; EVOLUTION; PATTERNS;
subject: 590 Tiere (Zoologie)

description: Past climate changes often have influenced the present distribution and intraspecific genetic diversity of organisms. The objective of this study was to investigate the phylogeography and historical demography of populations of Acromyrmex striatus (Roger, 1863), a leaf-cutting ant species restricted to the open plains of South America. Additionally, we modeled the distribution of this species to predict its contemporary and historic habitat. From the partial sequences of the mitochondrial gene cytochrome oxidase I of 128 A. striatus workers from 38 locations we estimated genetic diversity and inferred historical demography, divergence time, and population structure. The potential distribution areas of A. striatus for current and quaternary weather conditions were modeled using the maximum entropy algorithm. We identified a total of 58 haplotypes, divided into five main haplogroups. The analysis of molecular variance (AMOVA) revealed that the largest proportion of genetic variation is found among the groups of populations. Paleodistribution models suggest that the potential habitat of A. striatus may have decreased during the Last Interglacial Period (LIG) and expanded during the Last Maximum Glacial (LGM). Overall, the past potential distribution recovered by the model comprises the current potential distribution of the species. The general structuring pattern observed was consistent with isolation by distance, suggesting a balance between gene flow and drift. Analysis of historical demography showed that populations of A. striatus had remained constant throughout its evolutionary history. Although fluctuations in the area of their potential historic habitat occurred during quaternary climate changes, populations of A. striatus are strongly structured geographically. However, explicit barriers to gene flow have not been identified. These findings closely match those in Mycetophylax simplex, another ant species that in some areas occurs in sympatry with A. striatus. Ecophysiological traits of this species and isolation by distance may together have shaped the phylogeographic pattern.
Rossby Wave Instability in Astrophysical Discs
Creators: name: Lovelace, R. V. E.
name: Romanova, M. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A brief review is given of the Rossby wave instability (RWI) in astrophysical discs. In non-self-gravitating discs, around for example a newly forming stars, the instability can be triggered by an axisymmetric bump at some radius $r_0$ in the disc surface mass-density. It gives rise to exponentially growing non-axisymmetric perturbation [$\propto \exp({\rm i}mϕ)$, $m=1,2..$] in the vicinity of $r_0$ consisting of {\it anticyclonic} vortices. These vortices are regions of high pressure and consequently act to trap dust particles which in turn can facilitate planetesimal growth in proto-planetary discs. The Rossby vortices in the discs around stars and black holes may cause the observed quasi-periodic modulations of the disc's thermal emission.
description: 11 pages, 4 figures
Curvature vs Distances: testing the FLRW cosmology
Creators: name: Sapone, Domenico
name: Majerotto, Elisabetta
name: Nesseris, Savvas
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We test the FLRW cosmology by reconstructing in a model-independent way both the Hubble parameter $H(z)$ and the comoving distance $D(z)$ via the most recent Hubble and Supernovae Ia data. In particular we use: data binning with direct error propagation, the principal component analysis, the genetic algorithms and the Padé approximation. Using our reconstructions we evaluate the Clarkson {\it et al} test known as $Ω_K(z)$, whose value is constant in redshift for the standard cosmological model, but deviates elsewise. We find good agreement with the expected values of the standard cosmological model within the experimental errors. Finally, we provide forecasts, exploiting the Baryon Acoustic Oscillations measurements from the Euclid survey.
description: 22 pages, 17 figures; changes match published version
Killing the Straw Man: Does BICEP Prove Inflation at the GUT Scale?
Creators: name: Dent, James B.
name: Krauss, Lawrence M.
name: Mathur, Harsh
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The surprisingly large value of $r$, the ratio of power in tensor to scalar density perturbations in the CMB reported by the BICEP2 Collaboration, if confirmed, provides strong evidence for Inflation at the GUT scale. While the Inflationary signal remains the best motivated source, a large value of $r$ alone would still allow for the possibility that a comparable gravitational wave background might result from a self ordering scalar field (SOSF) transition that takes place later at somewhat lower energy. We find that even without detailed considerations of the predicted BICEP signature of such a transition, simple existing limits on the isocurvature contribution to CMB anisotropies would definitively rule out a contribution of more than $5\%$ to $r \approx 0.2$,. We also present a general relation for the allowed fractional SOSF contribution to $r$ as a function of the ultimate measured value of $r$. These results point strongly not only to an inflationary origin of the BICEP2 signal, if confirmed, but also to the fact that if the GUT scale is of order $10^{16} GeV$ then either the GUT transition happens before Inflation or the Inflationary transition and the GUT transition must be one and the same.
description: 3 pages 2 figures, accepted for publication in Physics Letters B . Accepted version revised slightly in response to referee's comments
Self-organization in foliated phase space: Construction of a scale hierarchy by adiabatic invariants of magnetized particles
Creators: name: Yoshida, Z.
name: Mahajan, S. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Adiabatic invariants foliate phase space, and impart a macro-scale hierarchy by separating microscopic variables. On a macroscopic leaf, long-scale ordered structures are created while maximizing entropy. A plasma confined in a magnetosphere is invoked for unveiling the organizing principle ---in the vicinity of a magnetic dipole, the plasma self-organizes to a state with a steep density gradient. The resulting nontrivial structure has maximum entropy in an appropriate, constrained phase space. One could view such a phase space as a leaf foliated in terms of Casimir invariants ---adiabatic invariants measuring the number of quasi-particles (macroscopic representation of periodic motions) are identified as the relevant Casimir invariants. The density clump is created in response to the inhomogeneity of the energy level (frequency) of quasi-particles.
Asymmetrical bloch branes and the hierarchy problem
Creators: name: Dutra, A. de Souza
name: de Brito, G. P.
name: da Silva, J. M. Hoff
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate a two scalar fields split braneworld model which leads to a possible approach to the hierarchy problem within the thick brane scenario. The model exhibits a resulting asymmetric warp factor suitable for this purpose. The solution is obtained by means of the orbit equation approach for a specific value of one of the parameters. Besides, we analyze the model qualitative behaviour for arbitrary parameters by inspecting the underlying dynamical system defined by the equations which give rise to the braneworld model. We finalize commenting on the metric fluctuation and stability issues.
description: 8 pages, 7 figures
Influence of quantum matter fluctuations on geodesic deviation
Creators: name: Drago, Nicolò
name: Pinamonti, Nicola
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study the passive influence of quantum matter fluctuations on the expansion parameter of a congruence of timelike geodesics in a semiclassical regime. In particular, we show that, the perturbations of this parameter can be considered to be elements of the algebra of matter fields at all perturbative order. Hence, once a quantum state for matter is chosen, it is possible to explicitly evaluate the behavior of geometric fluctuations. After introducing the formalism necessary to treat similar problems, in the last part of the paper, we estimate the approximated probability of having a geodesic collapse in a flat spacetime due to those fluctuations.
description: 21 pages, published version, J. Phys. A: Math. Theor. 47 (2014) 375202
Free Speech, Speech Act Theory and “Speech Brigaded with Action”: When Does Protected Speech Become Regulable Action?
Creators: name: Weston, Daniel A.
Publisher: name: University of Leicester
Year: 2020
Subjects: Uncategorized

description: Central to any principle of free speech is some form of distinction between “speech” on the one hand and “action/conduct” on the other. I enquire into one way this distinction has been explored: via the application of speech act theory. I criticise legal applications of speech act theory which argue that some speech ought to better be understood as regulable action. Contrary to these arguments, I demonstrate that – according to the same speech act theory invoked by my interlocutors – all speech is the performance of “action” in the relevant sense. A categorical pursuit, through speech act theory, as to what speech “acts” or “does” things cannot be supported, and such a classification is a faulty foundation for legal regulation. I critique speech act-oriented, descriptive enquiries, into which speech really is “speech” and which is the performance of “actions”. Instead, I suggest that their approach does not provide a viable alternative to conducting normative, value-oriented assessments regarding what speech should be considered “speech” for legal protection. Though this debate has relevance for any principle of free speech, by virtue of a shared commitment to some form of distinction between speech and action, I focus part of my analysis on the First Amendment because it explicitly regulates speech on the basis that it is “speech brigaded with action” or a “verbal act”. This presents a worrying direct legal hook onto which these speech act arguments might hang, but, as I argue, this should be resisted. In addition to my theoretical contestation, I show that the judicial understanding of when speech becomes “brigaded with action” is irreconcilable with these speech act applications
X-ray view of emission lines in optical spectra: Spectral analysis of the two low-mass X-ray binary systems Swift J1357.2-0933 and MAXI J1305-704
Creators: name: Anitra, A.
name: Miceli, C.
name: Di Salvo, T.
name: Iaria, R.
name: Degenaar, N.
name: Miller, M. Jon
name: Barra, F.
name: Leone, W.
name: Burderi, L.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We propose a novel approach for determining the orbital inclination of low-mass X-ray binary systems by modelling the H$α$ and H$β$ line profiles emitted by the accretion disc, with a Newtonian version of diskline. We applied the model to two sample sources, Swift J1357.2-0933 and MAXI J1305-704, which are both transient black hole systems, and analyse two observations that were collected during a quiescent state and one observation of an outburst. The line profile is well described by the diskline model, although we had to add a Gaussian line to describe the deep inner core of the double-peaked profile, which the diskline model was unable to reproduce. The H$β$ emission lines in the spectrum of Swift J1357.2-0933 and the H$α$ emission lines in that of MAXI J1305-704 during the quiescent state are consistent with a scenario in which these lines originate from a disc ring between $(9.6-57) \times 10^{3}, \rm{R_{g}}$ and $(1.94-20) \times 10^{4}, \rm{R_{g}}$, respectively. We estimate an inclination angle of $81 \pm 5$ degrees for Swift J1357.2-0933 and an angle of $73 \pm 4$ degrees for MAXI J1305-704. This is entirely consistent with the values reported in the literature. In agreement with the recent literature, our analysis of the outburst spectrum of MAXI J1305-704 revealed that the radius of the emission region deviates from expected values. This outcome implies several potential scenarios, including alternative disc configuration or even a circumbinary disc. We caution that these results were derived from a simplistic model that may not fully describe the complicated physics of accretion discs. Despite these limitations, our results for the inclination angles are remarkably consistent with recent complementary studies, and the proposed description of the emitting region remains entirely plausible.
description: 11 pages, 7 figures
title: Когнитивно-визуальные технологии как способ формирования информационной компетентности студентов педагогического направления
title: Cognitive and Visual Technologies as a Way of Development Cognitive and Visual Technologies as a Way of Development
Creators: name: Камалеева, Алсу Рауфовна
name: Муллер, Ольга Юрьевна
Publisher: name: Издательский центр СурГУ
Year: 2022

description: Цель исследования – опытно-экспериментальная работа по проверке эффективности формирования информационной компетентности будущих педагогов средствами когнитивной
визуализации. Методы, используемые при проведении исследования: литературный обзор, опытно-
экспериментальная работа, сравнение, анализ, обобщение. Основу проведенного исследования составляют ментальные карты как вид когнитивно-визуальных технологий. Представлены эмпирические данные, влияющие на эффективность формирования информационной компетентности будущих
педагогов средствами когнитивной визуализации. Анализ экспериментальных данных позволяет
установить приоритеты в разработке методик и технологий проведения занятий с будущими педагогами с использованием когнитивно-визуальных технологий. Эксперимент охватывал четыре пробных
теста, в результате которых были установлены средние баллы, отражающие уровень подготовки студентов контрольной и экспериментальной групп к промежуточной аттестации. Результаты проведенного исследования подтверждают гипотезу о том, что ментальные карты в обучении студентов педагогического направления являются эффективным способом, повышающим уровень подготовки
к промежуточной аттестации, и, соответственно, уровень информационной компетентности у студентов, изучающих дисциплину «Педагогика».
description: The purpose of the study was to test the effectiveness of informational competence development
in future teachers by the means of cognitive visualization. The following methods were used in the study: literature review, experiment, comparison, analysis and synthesis. Mental maps being a type of cognitive
and visual technology formed the basis of the study. Empirical data affecting the development of informational
competence in future teachers by the means of cognitive visualization were presented. The experimental
data analysis allowed us to set the priorities in the development of methods and techniques of lessons
with future teachers using cognitive and visual technologies. The experiment consisted of four practice tests,
as a result of which the average score reflecting the level of students’ preparation to interim assessment of
both the control and the experimental groups was determined. Thus, mental maps proved to be an effective
way to raise the level of students’ preparation to interim assessment, and, accordingly, the level of informational
competence of students studying Pedagogy.
Strain in crystalline core-shell nanowires
Creators: name: Ferrand, David
name: Cibert, Joel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The strain configuration induced by the lattice mismatch in a core-shell nanowire is calculated analytically, taking into account the crystal anisotropy and the difference in stiffness constants of the two materials. The method is applied to nanowires with the wurtzite structure or the zinc-blende structure with the hexagonal / trigonal axis along the nanowire, and the results are compared to available numerical calculations and experimental data. It is also applied to multishell nanowires, and to core-shell nanowires grown along the $<001>$ axis of cubic semiconductors.
Buchbesprechung: Alexandra Borrmann, Der Schutz der Berufsfreiheit im deutschen Verfassungsrecht und im europäischen Gemeinschaftsrecht - Eine rechtsvergleichende Studie
Creators: name: Manssen, Gerrit
Publisher: name: Universität Regensburg
Year: 2003
Subjects: subject: 340 Recht

description: Berufsfreiheit, Verfassungsrecht, Gemeinschaftsrecht, Manssen, Buchbesprechung