cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A new look at the long-period eclipsing binary V383 Sco
Creators: name: Gałan, Cezary
name: Tomov, Toma
name: Kato, Taichi
name: Pojmański, Grzegorz
name: Szczygieł, Dorota M.
name: Pilecki, Bogumił
name: Graczyk, Dariusz
name: Gromadzki, Mariusz
name: Mikołajewski, Maciej
name: Gieren, Wolfgang
name: Strobel, Andrzej
name: Roukema, Boudewijn F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: V383Sco was discovered to be an eclipsing binary at the beginning of the XX century. This system has one of the longest orbital periods known (13.5yr) and was initially classified as a zet_Aur-type variable. It was then forgotten for decades. This study provides a detailed look at the V383Sco, using new data obtained around the last eclipse in 2007/8. There was a suspicion that this system could be similar to eclipsing systems with extensive dusty disks like EECep and eps_Aur. This and other, alternative hypotheses are considered. The ASAS-3 VI light curves have been used to examine photometric changes. Low-(LRS) and high-res.(HRS) spectra have been used for spectral classification, to analyse line profiles, as well as to determine the reddening, radial velocities (RVs) and distance. The SED was analysed. Using original numerical code, we performed a simplified model of the eclipse, taking into account the pulsations of one of the components. The LRS shows traces of molecular bands, characteristic of an M-type supergiant. The presence of this star in the system is confirmed by SED, by a strong dependence of the eclipse depth on the photometric bands, and by pulsational changes. The presence of a low excitation nebula around the system has been inferred from [OI] 6300A emission. Analysis of the RVs, reddening, and P-L relation for Mira-type stars imply a distance to the V383Sco of 8.4+-0.6 kpc. The distance to the nearby V381Sco is 6.4+-0.8 kpc. The very different and oppositely directed RVs of these systems (89.8 vs -178.8 km/s) seem to be in agreement with a bulge/bar kinematic model of the Galactic centre and inconsistent with purely circular motion. We have found evidence for the presence of a pulsating M-type supergiant in the V383Sco which periodically obscures the much more luminous F0I-type star, causing the deep (possibly total) eclipses which vary in duration and shape.
description: Accepted for publication in Section 7. Stellar structure and evolution of Astronomy and Astrophysics; The official date of acceptance is 04/12/2012; 19 pages, 18 figures, 12 tables
Photonic Integrated Circuits for Long-Range Solid-State LiDAR Applications
Creators: name: Kandil, Mennatallah
name: Peyskens, Frederic
name: Dahlem, Marcus
name: Bogaerts, Wim
Publisher: name: Zenodo
Year: 2022

description: LiDAR provides high resolution detection of objects over large distances using light. However, fulfilling the performance metrics of mass-reproducible solid-state LiDAR is an ongoing challenge. Particularly, automotive forward-looking LiDAR requires projecting and receiving light at distances over 200m. Large frame rates, high angular resolution and wide field-of-view are essential to construct an accurate 3D point cloud of the surrounding environment. To have a sufficient photon count on the LiDAR detector, a collimated beam of high power needs to be emitted from the transmitter. To utilize LiDAR for the automotive industry, the device needs to be low cost, with small form-factor and low power consumption. Therefore, implementing LiDAR on photonic chips is a promising approach due to the low-cost volume production of CMOS foundry processes, the low power consumption of photonic components and the small chip-based form-factor compared to other LiDAR implementations. The two main functionalities that photonics contribute to the LiDAR engine are ranging (determining the distance to an object) and beam steering (pointing the beam in a certain direction). In our work, we focus on the latter functionality, based on the concept of optical phased arrays (OPAs). An OPA is an array of optical antennas where the amplitudes and phases of the emitted optical signals are controlled to manipulate the total far-field radiation pattern. This pattern corresponds to the light signal that is projected onto the object to be detected. Designing OPA architectures with high fill-factor and antennas with long length and high efficiency should make it possible to attain the field-of-view and resolution requirements of automotive LiDAR. Low power circuits of small form-factor require optimizing the photonic components to have low loss, small footprint, along with improving dense circuit routing techniques. Such improvements pave the way to build large scale photonic circuits for a fully integrated LiDAR system.
Spectroscopic and theoretical study of dipole moments of alkali dimers
Creators: name: Gerdes, Andreas
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Laser spectroscopy
subject: quantum chemistry calculations
subject: Stark effect
subject: Laserspektroskopie
subject: Quantenchemie-Berechnungen
subject: Starkeffekt
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
A Distributed Approach to Interference Alignment in OFDM-based Two-tiered Networks
Creators: name: Maso, Marco
name: Debbah, Merouane
name: Vangelista, Lorenzo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this contribution, we consider a two-tiered network and focus on the coexistence between the two tiers at physical layer. We target our efforts on a long term evolution advanced (LTE-A) orthogonal frequency division multiple access (OFDMA) macro-cell sharing the spectrum with a randomly deployed second tier of small-cells. In such networks, high levels of co-channel interference between the macro and small base stations (MBS/SBS) may largely limit the potential spectral efficiency gains provided by the frequency reuse 1. To address this issue, we propose a novel cognitive interference alignment based scheme to protect the macro-cell from the cross-tier interference, while mitigating the co-tier interference in the second tier. Remarkably, only local channel state information (CSI) and autonomous operations are required in the second tier, resulting in a completely self-organizing approach for the SBSs. The optimal precoder that maximizes the spectral efficiency of the link between each SBS and its served user equipment is found by means of a distributed one-shot strategy. Numerical findings reveal non-negligible spectral efficiency enhancements with respect to traditional time division multiple access approaches at any signal to noise (SNR) regime. Additionally, the proposed technique exhibits significant robustness to channel estimation errors, achieving remarkable results for the imperfect CSI case and yielding consistent performance enhancements to the network.
description: 15 pages, 10 figures, accepted and to appear in IEEE Transactions on Vehicular Technology Special Section: Self-Organizing Radio Networks, 2013. Authors' final version. Copyright transferred to IEEE
The Intensity of Diffuse Galactic Emission Reflected by Meteor Trails
Creators: name: Zhao, Feiyu
name: Liang, Ruxi
name: Yang, Zepei
name: Shan, Huanyuan
name: Zheng, Qian
name: Zhang, Qiqian
name: Guo, Quan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We calculate the reflection of diffuse galactic emission by meteor trails and investigate its potential relationship to Meteor Radio Afterglow (MRA). The formula to calculate the reflection of diffuse galactic emission is derived from a simplified case, assuming that the signals are mirrored by the cylindrical over-dense ionization trail of meteors. The overall observed reflection is simulated through a ray tracing algorithm together with the diffuse galactic emission modelled by the GSM sky model. We demonstrate that the spectrum of the reflected signal is broadband and follows a power law with a negative spectral index of around -1.3. The intensity of the reflected signal varies with local sidereal time and the brightness of the meteor and can reach 2000 Jy. These results agree with some previous observations of MRAs. Therefore, we think that the reflection of galactic emission by meteor trails can be a possible mechanism causing MRAs, which is worthy of further research.
description: 15 pages, 10 figures, 2 tables, accepted for publication in MNRAS, 10.1093/mnras/stad3429
title: Project Report : NOAA Ship Oscar Elton Sette, Project SE-19-04
titleType: Other
Creators: name: United States. National Marine Fisheries Service Pacific Islands Fisheries Science Center (U.S.)
Publisher: name: United States. National Marine Fisheries Service Pacific Islands Fisheries Science Center (U.S.)
Year: 2019

description: PIFSC project report SE ; 17-05
The Corona Australis star formation complex is accelerating away from the Galactic plane
Creators: name: Posch, L.
name: Miret-Roig, N.
name: Alves, J.
name: Ratzenböck, S.
name: Großschedl, J.
name: Meingast, S.
name: Zucker, C.
name: Burkert, A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the kinematics of the recently discovered Corona Australis (CrA) chain of clusters by examining the 3D space motion of its young stars using Gaia DR3 and APOGEE-2 data. While we observe linear expansion between the clusters in the Cartesian XY directions, the expansion along Z exhibits a curved pattern. To our knowledge, this is the first time such a nonlinear velocity-position relation has been observed for stellar clusters. We propose a scenario to explain our findings, in which the observed gradient is caused by stellar feedback, accelerating the gas away from the Galactic plane. A traceback analysis confirms that the CrA star formation complex was located near the central clusters of the Scorpius Centaurus (Sco-Cen) OB association 10-15 Myr ago. It contains massive stars and thus offers a natural source of feedback. Based on the velocity of the youngest unbound CrA cluster, we estimate that a median number of about two supernovae would have been sufficient to inject the present-day kinetic energy of the CrA molecular cloud. This number agrees with that of recent studies. The head-tail morphology of the CrA molecular cloud further supports the proposed feedback scenario, in which a feedback force pushed the primordial cloud from the Galactic north, leading to the current separation of 100 pc from the center of Sco-Cen. The formation of spatially and temporally well-defined star formation patterns, such as the CrA chain of clusters, is likely a common process in massive star-forming regions.
description: Accepted for publication as a Letter in Astronomy and Astrophysics
Intermittency in spherical Couette dynamos
Creators: name: Raynaud, Raphaël
name: Dormy, Emmanuel
Publisher: name: arXiv
Year: 2013
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We investigate dynamo action in three-dimensional numerical simulations of turbulent spherical Couette flows. Close to the onset of dynamo action, the magnetic field exhibits an intermittent behavior, characterized by a series of short bursts of the magnetic energy separated by low-energy phases. We show that this behavior corresponds to the so-called on-off intermittency. This behavior is here reported for dynamo action with realistic boundary conditions. We investigate the role of magnetic boundary conditions in this phenomenon.
Spin dynamics of equilibrium electrons in gallium arsenide
Creators: name: Müller, Georg Martin
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: GaAs
subject: spin dynamics
subject: spin noise
subject: Spindynamik
subject: Spinrauschen
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Stable iron isotope variations in higher plants : systematics and controls
Creators: name: Stelling, Monika
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Iron isotope fractionation
subject: higher plants
subject: MC-ICP-MS
subject: Eisenisotopenfraktionierung
subject: höhere Pflanzen
subject: Dewey Decimal Classification::500 | Naturwissenschaften::580 | Pflanzen (Botanik)

description: [no abstract]
Additional file 1 of Trajectories of cardiac troponin in the decades before cardiovascular death: a longitudinal cohort study
Creators: name: Kimenai, Dorien M.
name: Anand, Atul
name: de Bakker, Marie
name: Shipley, Martin
name: Fujisawa, Takeshi
name: Lyngbakken, Magnus N.
name: Hveem, Kristian
name: Omland, Torbjørn
name: Valencia-Hernández, Carlos A.
name: Lindbohm, Joni V.
name: Kivimaki, Mika
name: Singh-Manoux, Archana
name: Strachan, Fiona E.
name: Shah, Anoop S. V.
name: Kardys, Isabella
name: Boersma, Eric
name: Brunner, Eric J.
name: Mills, Nicholas L.
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Science Policy
subject: Computational Biology

description: Additional file 1: Supplementary Appendix. Principle of joint modelling. Table S1. Clinical characteristics of study population at first, second and third troponin measurement. Table S2. Association between clinical characteristics and longitudinal cardiac troponin I. Table S3. Baseline characteristics of those who experienced an event. Table S4. Association between the cardiac troponin I level at baseline and cardiovascular death. Table S5. Baseline characteristics of individuals without cardiac disease at baseline. Table S6. Association between the temporal evolution of cardiac troponin I and cardiovascular death in individuals without cardiac disease at baseline. Table S7. The longitudinal cardiac troponin’s accuracy. Table S8. Association between serial cardiac troponin measurements and cardiovascular death in HUNT. Fig S1. Study flow diagram. Fig S2. Cardiac troponin I levels at baseline, 10 years and 15 years, stratified by sex and age groups. Fig S3. Trajectories of cardiac troponin I with 95% confidence intervals before non-cardiovascular death occurred or at end of follow-up. Fig S4. Trajectories of cardiac troponin I with 95% confidence intervals before cardiovascular death or non-cardiovascular death occurred or at end of follow-up. Fig S5. Trajectories of cardiac troponin I with 95% confidence intervals before cardiac death occurred or at end of follow-up. Fig S6. Trajectories of cardiac troponin I with 95% confidence intervals before non-fatal myocardial infarction, fatal myocardial infarction and no myocardial infarction event. Fig S7. Trajectories of cardiac troponin I with 95% confidence intervals in individuals without baseline cardiac disease before cardiovascular death occurred or at end of follow-up. Fig S8. Trajectories of cardiac troponin I with 95% confidence intervals before cardiovascular death and death from any causein HUNT.
On the Current Measurement Practices in Agile Software Development
Creators: name: Javdani, Taghi
name: Zulzalil, Hazura
name: Ghani, Abdul Azim Abd
name: Sultan, Abu Bakar Md
name: Parizi, Reza Meimandi
Publisher: name: arXiv
Year: 2013
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Agile software development (ASD) methods were introduced as a reaction to traditional software development methods. Principles of these methods are different from traditional methods and so there are some different processes and activities in agile methods comparing to traditional methods. Thus ASD methods require different measurement practices comparing to traditional methods. Agile teams often do their projects in the simplest and most effective way so, measurement practices in agile methods are more important than traditional methods, because lack of appropriate and effective measurement practices, will increase risk of project. The aims of this paper are investigation on current measurement practices in ASD methods, collecting them together in one study and also reviewing agile version of Common Software Measurement International Consortium (COSMIC) publication.
description: 7 pages
title: Rezension zu: Sejdini, Zekirija / Kraml, Martina / Scharer, Matthias: Mensch werden. Grundlagen einer interreligiösen Religionspädagogik und -didaktik aus muslimisch-christlicher Sicht
Creators: name: Yagdi, Senol
Publisher: name: Universität Graz
Year: 2019

description: Österreichisches Religionspädagogisches Forum, 27(2), 200-204
Experimental signatures of quantum and topological states in frustrated magnetism
Creators: name: Khatua, J.
name: Sana, B.
name: Zorko, A.
name: Gomilšek, M.
name: Rao, K. Sethupathi M. S. Ramachandra
name: Baenitz, M.
name: Schmidt, B.
name: Khuntia, P.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Frustration in magnetic materials arising from competing exchange interactions can prevent the system from adopting long-range magnetic order and can instead lead to a diverse range of novel quantum and topological states with exotic quasiparticle excitations. Here, we review prominent examples of such emergent phenomena, including magnetically-disordered and extensively degenerate spin ices, which feature emergent magnetic monopole excitations, highly-entangled quantum spin liquids with fractional spinon excitations, topological order and emergent gauge fields, as well as complex particle-like topological spin textures known as skyrmions. We provide an overview of recent advances in the search for magnetically-disordered candidate materials on the three-dimensional pyrochlore lattice and two-dimensional triangular, kagome and honeycomb lattices, the latter with bond-dependent Kitaev interactions, and on lattices supporting topological magnetism. We highlight experimental signatures of these often elusive phenomena and single out the most suitable experimental techniques that can be used to detect them. Our review also aims at providing a comprehensive guide for designing and investigating novel frustrated magnetic materials, with the potential of addressing some important open questions in contemporary condensed matter physics.
title: Rezension zu: Khorchide, Mouhanad: Scharia – der missverstandene Gott. Der Weg zu einer modernen islamischen Ethik
Creators: name: Yagdi, Senol
Publisher: name: Universität Graz
Year: 2019

description: Österreichisches Religionspädagogisches Forum, 27(2), 210-213
Squeezed light at 1064 nm and 1550 nm with a nonclassical noise suppression beyond 10 dB
Creators: name: Mehmet, Moritz
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Squeezed light
subject: gravitational wave detector
subject: quantum information
subject: Gequetschtes Licht
subject: Gravitationswellendetektor
subject: Quanteninformation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
State preparation for quantum information science and metrology
Creators: name: Samblowski, Aiko
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Bipartite entaglement
subject: bound entanglement
subject: non-degenerate optical parametric oscillation
subject: quantum frequency conversion
subject: Gebundene Verschränkung
subject: nicht-entarteter optischer parametrischer Oszillator
subject: Quantenfrequenzkonversion
subject: Zweiparteien-Verschränkung
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Discovery of a 34 Hz Quasi-Periodic Oscillation in the X-ray emission of GRS 1915+105
Creators: name: Belloni, Tomaso M.
name: Altamirano, Diego
name: -
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report the discovery in the Rossi X-Ray Timing Explorer data of GRS 1915+105 of a second quasi-periodic oscillation at 34 Hz, simultaneous with that observed at 68 Hz in the same observation. The data corresponded to those observations from 2003 where the 68-Hz oscillation was very strong. The significance of the detection is 4.2 sigma. These observations correspond to a very specific position in the colour-colour diagram for GRS 1915+105, corresponding to a harder spectrum compared to those where a 41 Hz oscillation was discovered. We discuss the possible implications of the new pair of frequencies comparing them with the existing theoretical models.
description: 5 pages, 3 figures, Accepted for publication in MNRAS
A Global Multi-Unit Calibration as a Method for Large Scale IoT Particulate Matter Monitoring Systems Deployments
Creators: name: De Vito, Saverio
name: Elia, Gerardo D
name: Ferlito, Sergio
name: Di Francia, Girolamo
name: Davidovic, Milos
name: Kleut, Duska
name: Stojanovic, Danka
name: Stojanovic, Milena Jovasevic
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Scalable and effective calibration is a fundamental requirement for Low Cost Air Quality Monitoring Systems and will enable accurate and pervasive monitoring in cities. Suffering from environmental interferences and fabrication variance, these devices need to encompass sensors specific and complex calibration processes for reaching a sufficient accuracy to be deployed as indicative measurement devices in Air Quality (AQ) monitoring networks. Concept and sensor drift often force calibration process to be frequently repeated. These issues lead to unbearable calibration costs which denies their massive deployment when accuracy is a concern. In this work, We propose a zero transfer samples, global calibration methodology as a technological enabler for IoT AQ multisensory devices which relies on low cost Particulate Matter (PM) sensors. This methodology is based on field recorded responses from a limited number of IoT AQ multisensors units and machine learning concepts and can be universally applied to all units of the same type. A multi season test campaign shown that, when applied to different sensors, this methodology performances match those of state of the art methodology which requires to derive different calibration parameters for each different unit. If confirmed, these results show that, when properly derived, a global calibration law can be exploited for a large number of networked devices with dramatic cost reduction eventually allowing massive deployment of accurate IoT AQ monitoring devices. Furthermore, this calibration model could be easily embedded on board of the device or implemented on the edge allowing immediate access to accurate readings for personal exposure monitor applications as well as reducing long range data transfer needs.
Statistical signal analysis and estimation algorithms for mud pulse telemetry systems
Creators: name: Moghaddamnia, Sanam
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Mud pulse telemetry
subject: semi-blind and training sequence based signal processing
subject: interference and channel characterization
subject: transform domain interference suppression
subject: multi-channel diversity schemes
subject: hybrid receivers. - Mud-Pulse Telemetrie
subject: semi-blinde und trainingsbasierende Signalverarbeitung
subject: Charakterisierung von Pumpeninterferenz und Kanal
subject: Transform-Domain Interferenzunterdrückung
subject: Mehrkanal Diversitätsverfahren
subject: hybride Empfänger
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: [no abstract]
Estimating Photometric Redshifts of Quasars via K-nearest Neighbor Approach Based on Large Survey Databases
Creators: name: Yanxia, Zhang
name: He, Ma
name: Nanbo, Peng
name: Yongheng, Zhao
name: Xue-bing, Wu
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We apply one of lazy learning methods named k-nearest neighbor algorithm (kNN) to estimate the photometric redshifts of quasars, based on various datasets from the Sloan Digital Sky Survey (SDSS), UKIRT Infrared Deep Sky Survey (UKIDSS) and Wide-field Infrared Survey Explorer (WISE) (the SDSS sample, the SDSS-UKIDSS sample, the SDSS-WISE sample and the SDSS-UKIDSS-WISE sample). The influence of the k value and different input patterns on the performance of kNN is discussed. kNN arrives at the best performance when k is different with a special input pattern for a special dataset. The best result belongs to the SDSS-UKIDSS-WISE sample. The experimental results show that generally the more information from more bands, the better performance of photometric redshift estimation with kNN. The results also demonstrate that kNN using multiband data can effectively solve the catastrophic failure of photometric redshift estimation, which is met by many machine learning methods. By comparing the performance of various methods for photometric redshift estimation of quasars, kNN based on KD-Tree shows its superiority with the best accuracy for our case.
description: 28 pages, 4 figures, 3 tables, accepted for publication in AJ
Spacetime Singularities: Recent Developments
Creators: name: Uggla, Claes
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Recent developments concerning oscillatory spacelike singularities in general relativity are taking place on two fronts. The first treats generic singularities in spatially homogeneous cosmology, most notably Bianchi types VIII and IX. The second deals with generic oscillatory singularities in inhomogeneous cosmologies, especially those with two commuting spacelike Killing vectors. This paper describes recent progress in these two areas: in the spatially homogeneous case focus is on mathematically rigorous results, while analytical and numerical results concerning generic behavior and so-called recurring spike formation are the main topic in the inhomogeneous case. Unifying themes are connections between asymptotic behavior, hierarchical structures, and solution generating techniques, which provide hints for a link between the nature of generic singularities and a hierarchy of hidden asymptotic symmetries.
description: 21 pages, 7 figures (16 PDF figure files), plenary contribution to the Proceedings of the Thirteenth Marcel Grossmann Meeting
Status concerns, present-bias and the public provision of private goods
Creators: name: Lausen, Tobias
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2016
Subjects: subject: Public provision of private goods
subject: status concerns
subject: present-bias
subject: Staatliche Bereitstellung privater Güter
subject: Statuspräferenzen
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft

description: [no abstract]
Spin-orbital models in optical lattices
Creators: name: Sun, Gaoyong
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Spin-orbit coupling
subject: dipolar
subject: fidelity susceptibility
subject: Spin-Orbit Wechselwirkung
subject: Dipolare
subject: Fidelity-Suszeptibilität
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Joint Sensing and Power Allocation in Nonconvex Cognitive Radio Games: Quasi-Nash Equilibria
Creators: name: Pang, Jong-Shi
name: Scutari, Gesualdo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we propose a novel class of Nash problems for Cognitive Radio (CR) networks composed of multiple primary users (PUs) and secondary users (SUs) wherein each SU (player) competes against the others to maximize his own opportunistic throughput by choosing jointly the sensing duration, the detection thresholds, and the vector power allocation over a multichannel link. In addition to power budget constraints, several (deterministic or probabilistic) interference constraints can be accommodated in the proposed general formulation, such as constraints on the maximum individual/aggregate (probabilistic) interference tolerable from the PUs. To keep the optimization as decentralized as possible, global interference constraints, when present, are imposed via pricing; the prices are thus additional variables to be optimized. The resulting players' optimization problems are nonconvex and there are price clearance conditions associated with the nonconvex global interference constraints to be satisfied by the equilibria of the game, which make the analysis of the proposed game a challenging task; none of classical results in the game theory literature can be successfully applied. To deal with the nonconvexity of the game, we introduce a relaxed equilibrium concept, the Quasi-Nash Equilibrium (QNE), and study its main properties, performance, and connection with local Nash equilibria. Quite interestingly, the proposed game theoretical formulations yield a considerable performance improvement with respect to current centralized and decentralized designs of CR systems, which validates the concept of QNE.
description: to appear on IEEE Trans. on Signal Processing, 2013
Storage conditions and degassing processes of low-K and high-Al tholeiitic island-arc magmas : experimental constraints and natural observations for Mutnovsky volcano, Kamchatka
Creators: name: Shishkina, Tatiana
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Island arc tholeiites
subject: crystallization
subject: volatile solubility
subject: Inselbogen-Tholeiite
subject: Kristallisation
subject: Löslichkeit von Volatilen
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: [no abstract]
New mass limit for white dwarfs: super-Chandrasekhar type Ia supernova as a new standard candle
Creators: name: Das, Upasana
name: Mukhopadhyay, Banibrata
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Type Ia supernovae, sparked off by exploding white dwarfs of mass close to Chandrasekhar limit, play the key role to understand the expansion rate of universe. However, recent observations of several peculiar type Ia supernovae argue for its progenitor mass to be significantly super-Chandrasekhar. We show that strongly magnetized white dwarfs not only can violate the Chandrasekhar mass limit significantly, but exhibit a different mass limit. We establish from foundational level that the generic mass limit of white dwarfs is 2.58 solar mass. This explains the origin of over-luminous peculiar type Ia supernovae. Our finding further argues for a possible second standard candle, which has many far reaching implications, including a possible reconsideration of the expansion history of the universe.
description: 7 pages including 2 figures and supplementary information; accepted for publication in Physical Review Letters
Additional file 1 of BluePrint molecular subtypes predict response to neoadjuvant pertuzumab in HER2-positive breast cancer
Creators: name: Liefaard, M. C.
name: van der Voort, A.
name: van Ramshorst, M. S.
name: Sanders, J.
name: Vonk, S.
name: Horlings, H. M.
name: Siesling, S.
name: de Munck, L.
name: van Leeuwen, A. E.
name: Kleijn, M.
name: Mittempergher, L.
name: Kuilman, M. M.
name: Glas, A. M.
name: Wesseling, J.
name: Lips, E. H.
name: Sonke, G. S.
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Biotechnology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Plant Biology

description: Additional file 1. Supplementary Figures.
Stability of tautological bundles on Hilbert schemes of points on a surface
Creators: name: Wandel, Malte
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2013
Subjects: subject: Moduli spaces
subject: hyperkähler manifolds
subject: vector bundles
subject: Modulräume
subject: Hyperkählermannigfaltigkeiten
subject: Vektorbündel
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Cognitive Orthogonal Precoder for Two-tiered Networks Deployment
Creators: name: Maso, Marco
name: Cardoso, Leonardo S.
name: Debbah, Merouane
name: Vangelista, Lorenzo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this work, the problem of cross-tier interference in a two-tiered (macro-cell and cognitive small-cells) network, under the complete spectrum sharing paradigm, is studied. A new orthogonal precoder transmit scheme for the small base stations, called multi-user Vandermonde-subspace frequency division multiplexing (MU-VFDM), is proposed. MU-VFDM allows several cognitive small base stations to coexist with legacy macro-cell receivers, by nulling the small- to macro-cell cross-tier interference, without any cooperation between the two tiers. This cleverly designed cascaded precoder structure, not only cancels the cross-tier interference, but avoids the co-tier interference for the small-cell network. The achievable sum-rate of the small-cell network, satisfying the interference cancelation requirements, is evaluated for perfect and imperfect channel state information at the transmitter. Simulation results for the cascaded MU-VFDM precoder show a comparable performance to that of state-of-the-art dirty paper coding technique, for the case of a dense cellular layout. Finally, a comparison between MU-VFDM and a standard complete spectrum separation strategy is proposed. Promising gains in terms of achievable sum-rate are shown for the two-tiered network w.r.t. the traditional bandwidth management approach.
description: 11 pages, 9 figures, accepted and to appear in IEEE Journal on Selected Areas in Communications: Cognitive Radio Series, 2013. Copyright transferred to IEEE
High confidence AGN candidates among unidentified Fermi-LAT sources via statistical classification
Creators: name: Doert, M.
name: Errando, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The second Fermi-LAT source catalog (2FGL) is the deepest survey of the gamma-ray sky ever compiled, containing 1873 sources that constitute a very complete sample down to an energy flux of about 10^(-11) erg cm^(-2) s^(-1). While counterparts at lower frequencies have been found for a large fraction of 2FGL sources, active galactic nuclei (AGN) being the most numerous class, 576 gamma-ray sources remain unassociated. In these proceedings, we describe a statistical algorithm that finds candidate AGNs in the sample of unassociated 2FGL sources by identifying targets whose gamma-ray properties resemble those of known AGNs. Using two complementary learning algorithms and intersecting the high-probability classifications from both methods, we increase the confidence of the method and reduce the false-association rate to 11%. Our study finds a high-confidence sample of 231 AGN candidates among the population of 2FGL unassociated sources. Selecting sources out of this sample for follow-up observations or studies of archival data will substantially increase the probability to identify possible counterparts at other wavelengths.
Nonunitary geometric phases: a qubit coupled to an environment with random noise
Creators: name: Lombardo, Fernando C.
name: Villar, Paula I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We describe the decoherence process induced on a two-level quantum system in direct interaction with a non-equilibrium environment. The non-equilibrium feature is represented by a non-stationary random function corresponding to the fluctuating transition frequency between two quantum states coupled to the surroundings. In this framework, we compute the decoherence factors which have a characteristic "dip" related to the initial phases of the bath modes. We therefore study different types of environments, namely ohmic and supra-ohmic. These environments present different decoherence time-scales than the thermal environment we used to study. As a consequence, we compute analytically and numerically the non-unitary geometric phase for the qubit in a quasi-cyclic evolution under the presence of these particular non-equilibrium environments. We show in which cases decoherence effects could, in principle, be controlled in order to perform a measurement of the geometric phase using standard procedures.
description: 8 pages, 8 figures. To appear in Phys. Rev. A
Additional file 2 of BluePrint molecular subtypes predict response to neoadjuvant pertuzumab in HER2-positive breast cancer
Creators: name: Liefaard, M. C.
name: van der Voort, A.
name: van Ramshorst, M. S.
name: Sanders, J.
name: Vonk, S.
name: Horlings, H. M.
name: Siesling, S.
name: de Munck, L.
name: van Leeuwen, A. E.
name: Kleijn, M.
name: Mittempergher, L.
name: Kuilman, M. M.
name: Glas, A. M.
name: Wesseling, J.
name: Lips, E. H.
name: Sonke, G. S.
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Biotechnology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Plant Biology

description: Additional file 2. Supplementary Tables.
Stigmatic and astigmatic Gaussian beams in fundamental mode : impact of beam model choice on interferometric pathlength signal estimates
Creators: name: Kochkina, Evgenia
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2013
Subjects: subject: Interferometry
subject: Gaussian beams
subject: general astigmatism
subject: Interferometrie
subject: Gauß-Strahlen
subject: allgemeiner Astigmatismus
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Extremely strong CIV 1550 nebular emission in the extremely low-metallicity star-forming galaxy J2229+2725
Creators: name: Izotov, Y. I.
name: Schaerer, D.
name: Guseva, N. G.
name: Thuan, T. X.
name: Worseck, G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using Hubble Space Telescope (HST)/Cosmic Origins Spectrograph (COS) observations of one of the most metal-poor dwarf star-forming galaxies (SFG) in the local Universe, J2229+2725, we have discovered an extremely strong nebular CIV 1549, 1551 emission-line doublet, with an equivalent width of 43A, several times higher than the value observed so far in low-redshift SFGs. Together with other extreme characteristics obtained from optical spectroscopy (oxygen abundance 12+log(O/H)=7.085+/-0.031, ratio O32 = I([OIII]5007)/I([OII]3727) ~ 53, and equivalent width of the Hbeta emission line EW(Hbeta) = 577A), this galaxy greatly increases the range of physical properties for dwarf SFGs at low redshift and is a likely analogue of the high-redshift dwarf SFGs responsible for the reionization of the Universe. We find the ionizing radiation in J2229+2725 to be stellar in origin and the high EW(CIV 1549,1551) to be due to both extreme ionization conditions and a high carbon abundance, with a corresponding log C/O = -0.38, that is ~ 0.4 dex higher than the average value for nearby low-metallicity SFGs.
description: 6 pages, 4 figures, accepted for publikation in Monthly Notices of the Royal Astronomical Society Letters
Studies towards a total synthesis of akuammiline alkaloids
Creators: name: Eckermann, Ruben
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: total synthesis
subject: akuammiline alkaloids
subject: conformational analysis
subject: Totalsynthese
subject: Akuammilin Alkaloide
subject: Konformationsanalyse
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Effect of Andreev Processes on the Goos-Hänchen (GH) shift in the Graphene-Superconductor-Graphene (GSG) junctions
Creators: name: Salim, Shahrukh
name: Marathe, Rahul
name: Ghosh, Sankalpa
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In this article, we study the transport properties of Graphene-Superconductor-Graphene (GSG) heterojunction where the superconducting region is created in the middle of a graphene sheet, as contrasted to widely studied transport properties through a Superconductor-Graphene-Superconductor (SGS) type of Josephson junction. We particularly analyse in detail the Goos-Hänchen shift of the electron and the hole at the GS interface in such a junction, due to normal as well as Andreev reflection, using a transfer matrix-based approach. Additionally, we evaluate the normalised differential conductance as a function of bias voltage that characterises the transport through such junction and point out how they are influenced by Andreev and normal reflection. In the subsequent parts of the article we demonstrate how the GH shift for both electron and hole changes with the width of the superconducting region. The behavior of the differential conductance in such junctions as a function of the bias voltage in the region, dominated by Andreev and normal reflection, is also presented and analysed.
description: 15 pages, 11 figures, Accepted in Physica E (2023)
Sub-10-fs-Laserpulse für die Zwei-Photonen-Polymerisation
Creators: name: Emons, Moritz
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2013
Subjects: subject: Non-collinear optical-parametric amplification
subject: ultra-short laser pulses
subject: nanostructuring
subject: two-photon polymerization
subject: two-photon absorption
subject: diffraction-limit
subject: Nichtkollineare optisch-parametrische Verstärkung
subject: NOPA
subject: ultrakurze Laserpulse
subject: sub-10 fs
subject: Nanostrukturierung
subject: Zwei-Photonen-Polymerisation
subject: Zwei-Photonen-Absorption
subject: Beugungslimit
subject: sub-50-nm
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Singular probability distribution of shot-noise driven systems
Creators: name: Ichiki, Akihisa
name: Tadokoro, Yukihiro
name: Dykman, M. I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the stationary probability distribution of a system driven by shot noise. We find that, both in the overdamped and underdamped regime, the coordinate distribution displays power-law singularities in its central part. For sufficiently low rate of noise pulses they correspond to distribution peaks. We find the positions of the peaks and the corresponding exponents. In the underdamped regime the peak positions are given by a geometric progression. The energy distribution in this case also displays multiple peaks with positions given by a geometric progression. Such structure is a signature of the shot-noise induced fluctuations. The analytical results are in excellent agreement with numerical simulations.
Neural-based Compression Scheme for Solar Image Data
Creators: name: Zafari, Ali
name: Khoshkhahtinat, Atefeh
name: Grajeda, Jeremy A.
name: Mehta, Piyush M.
name: Nasrabadi, Nasser M.
name: Boucheron, Laura E.
name: Thompson, Barbara J.
name: Kirk, Michael S. F.
name: da Silva, Daniel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Information Theory (cs.IT)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Studying the solar system and especially the Sun relies on the data gathered daily from space missions. These missions are data-intensive and compressing this data to make them efficiently transferable to the ground station is a twofold decision to make. Stronger compression methods, by distorting the data, can increase data throughput at the cost of accuracy which could affect scientific analysis of the data. On the other hand, preserving subtle details in the compressed data requires a high amount of data to be transferred, reducing the desired gains from compression. In this work, we propose a neural network-based lossy compression method to be used in NASA's data-intensive imagery missions. We chose NASA's SDO mission which transmits 1.4 terabytes of data each day as a proof of concept for the proposed algorithm. In this work, we propose an adversarially trained neural network, equipped with local and non-local attention modules to capture both the local and global structure of the image resulting in a better trade-off in rate-distortion (RD) compared to conventional hand-engineered codecs. The RD variational autoencoder used in this work is jointly trained with a channel-dependent entropy model as a shared prior between the analysis and synthesis transforms to make the entropy coding of the latent code more effective. Our neural image compression algorithm outperforms currently-in-use and state-of-the-art codecs such as JPEG and JPEG-2000 in terms of the RD performance when compressing extreme-ultraviolet (EUV) data. As a proof of concept for use of this algorithm in SDO data analysis, we have performed coronal hole (CH) detection using our compressed images, and generated consistent segmentations, even at a compression rate of $\sim0.1$ bits per pixel (compared to 8 bits per pixel on the original data) using EUV data from SDO.
description: Accepted for publication in IEEE Transactions on Aerospace and Electronic Systems (TAES). arXiv admin note: text overlap with arXiv:2210.06478
Sulfur and sulfur isotope distribution between fluids and silicate melts : an experimental investigation
Creators: name: Fiege, Adrian
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2013
Subjects: subject: Sulfur
subject: basalt
subject: andesite
subject: decompression experiments
subject: kinetics of volcanic degassing
subject: sulfur fluid-melt partitioning
subject: sulfur isotope fractionation
subject: Schwefel
subject: Andesit
subject: Druckentlastungsexperimente
subject: Kinetik vulkanischer Entgasung
subject: Fluid-Schmelz Verteilung von Schwefel
subject: Schwefel-Isotopen-Fraktionierung
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: [no abstract]