cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hayabusa-2 Mission Target Asteroid 162173 Ryugu (1999 JU3): Searching for the Object's Spin-Axis Orientation
Creators: name: Müller, T. G.
name: Ďurech, J.
name: Ishiguro, M.
name: Mueller, M.
name: Krühler, T.
name: Yang, H.
name: Kim, M. -J.
name: O'Rourke, L.
name: Usui, F.
name: Kiss, C.
name: Altieri, B.
name: Carry, B.
name: Choi, Y. -J.
name: Delbo, M.
name: Emery, J. P.
name: Greiner, J.
name: Hasegawa, S.
name: Hora, J. L.
name: Knust, F.
name: Kuroda, D.
name: Osip, D.
name: Rau, A.
name: Rivkin, A.
name: Schady, P.
name: Thomas-Osip, J.
name: Trilling, D.
name: Urakawa, S.
name: Vilenius, E.
name: Weissman, P.
name: Zeidler, P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The JAXA Hayabusa-2 mission was approved in 2010 and launched on December 3, 2014. The spacecraft will arrive at the near-Earth asteroid 162173 Ryugu in 2018 where it will perform a survey, land and obtain surface material, then depart in Dec 2019 and return to Earth in Dec 2020. We observed Ryugu with the Herschel Space Observatory in Apr 2012 at far-IR thermal wavelengths, supported by several ground-based observations to obtain optical lightcurves. We reanalysed previously published Subaru-COMICS and AKARI-IRC observations and merged them with a Spitzer-IRS data set. In addition, we used a large set of Spitzer-IRAC observations obtained in the period Jan to May, 2013. The data set includes two complete rotational lightcurves and a series of ten "point-and-shoot" observations. The almost spherical shape of the target together with the insufficient lightcurve quality forced us to combine radiometric and lightcurve inversion techniques in different ways to find the object's key physical and thermal parameters. We find that the solution which best matches our data sets leads to this C class asteroid having a retrograde rotation with a spin-axis orientation of (lambda = 310-340 deg; beta = -40+/-15 deg) in ecliptic coordinates, an effective diameter (of an equal-volume sphere) of 850 to 880 m, a geometric albedo of 0.044 to 0.050 and a thermal inertia in the range 150 to 300 Jm-2s-0.5K-1. Based on estimated thermal conductivities of the top-layer surface in the range 0.1 to 0.6 WK-1m-1, we calculated that the grain sizes are approximately equal to between 1 and 10 mm. The finely constrained values for this asteroid serve as a `design reference model', which is currently used for various planning, operational and modelling purposes by the Hayabusa2 team.
description: Accepted for publication in Astronomy & Astrophysics, 28 pages, 16 figures
A fully differentiable model for unsupervised singing voice separation
Creators: name: Richard, Gael
name: Chouteau, Pierre
name: Torres, Bernardo
Publisher: name: arXiv
Year: 2024
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A novel model was recently proposed by Schulze-Forster et al. in [1] for unsupervised music source separation. This model allows to tackle some of the major shortcomings of existing source separation frameworks. Specifically, it eliminates the need for isolated sources during training, performs efficiently with limited data, and can handle homogeneous sources (such as singing voice). But, this model relies on an external multipitch estimator and incorporates an Ad hoc voice assignment procedure. In this paper, we propose to extend this framework and to build a fully differentiable model by integrating a multipitch estimator and a novel differentiable assignment module within the core model. We show the merits of our approach through a set of experiments, and we highlight in particular its potential for processing diverse and unseen data.
A thorough analysis of the short- and mid-term activity-related variations in the solar acoustic frequencies
Creators: name: Santos, A. R. G.
name: Cunha, M. S.
name: Avelino, P. P.
name: Chaplin, W. J.
name: Campante, T. L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The frequencies of the solar acoustic oscillations vary over the activity cycle. The variations in other activity proxies are found to be well correlated with the variations in the acoustic frequencies. However, each proxy has a slightly different time behaviour. Our goal is to characterize the differences between the time behaviour of the frequency shifts and of two other activity proxies, namely, the area covered by sunspots and the 10.7cm flux. We define a new observable that is particularly sensitive to the short-term frequency variations. We then compare the observable when computed from model frequency shifts and from observed frequency shifts obtained with the Global Oscillation Network Group (GONG) for cycle 23. Our analysis shows that on the shortest time-scales the variations in the frequency shifts seen in the GONG observations are strongly correlated with the variations in the area covered by sunspots. However, a significant loss of correlation is still found. We verify that the times when the frequency shifts and the sunspot area do not vary in a similar way tend to coincide with the times of the maxima of the quasi-biennial variations seen in the solar seismic data. A similar analysis of the relation between the 10.7cm flux and the frequency shifts reveals that the short-time variations in the frequency shifts follow even more closely those of the 10.7cm flux than those of the sunspot area. However, a loss of correlation between frequency shifts and 10.7cm flux variations is still found around the same times.
description: 7 pages, 6 figures, accepted for publication in MNRAS
Dual User Selection for Security Enhancement in Uplink Multiuser Systems
Creators: name: Deng, Hao
name: Wang, Hui-Ming
name: Wang, Wenjie
name: Lee, Moon Ho
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This letter proposes a novel dual user selection scheme for uplink transmission with multiple users, where a jamming user and a served user are jointly selected to improve the secrecy performance. Specifically, the jamming user transmits jamming signal with a certain rate, so that the base station (BS) can decode the jamming signal before detecting the secret information signal. By carefully selecting the jamming user and the served user, it makes the eavesdropper decode the jamming signal with a low probability meanwhile the BS can achieve a high receive signal-to-noise ratio (SNR). Therefore, the uplink transmission achieves the dual secrecy improvement by jamming and scheduling. It is shown that the proposed scheme can significantly improve the security of the uplink transmission.
description: journal paper, double column, 4 pages, 1 figure, accepted for publication on IEEE Communications Letters
Towards Adaptive Compliance
Creators: name: García-Galán, Jesús
name: Pasquale, Liliana
name: Grispos, George
name: Nuseibeh, Bashar
Publisher: name: arXiv
Year: 2016
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Mission critical software is often required to comply with multiple regulations, standards or policies. Recent paradigms, such as cloud computing, also require software to operate in heterogeneous, highly distributed, and changing environments. In these environments, compliance requirements can vary at runtime and traditional compliance management techniques, which are normally applied at design time, may no longer be sufficient. In this paper, we motivate the need for adaptive compliance by illustrating possible compliance concerns determined by runtime variability. We further motivate our work by means of a cloud computing scenario, and present two main contributions. First, we propose and justify a process to support adaptive compliance that ex- tends the traditional compliance management lifecycle with the activities of the Monitor-Analyse-Plan-Execute (MAPE) loop, and enacts adaptation through re-configuration. Second, we explore the literature on software compliance and classify existing work in terms of the activities and concerns of adaptive compliance. In this way, we determine how the literature can support our proposal and what are the open research challenges that need to be addressed in order to fully support adaptive compliance.
description: Position paper at SEAMS'16
Do moss sporophytes maintain water balance? New insights from sporophyte water relations and the wild maturation cycle in Funaria hygrometrica Hedw.
Creators: name: Duckett, Jeffrey G.
name: Pressel, Silvia
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Cell Biology
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
subject: Computational Biology

description: The water relations of Funaria hygrometrica Hedw. sporophytes have never been investigated, although unchanged morphology through periods of drought suggests that they may be homoiohydric. Knowledge of the sporophyte maturation cycle is also incomplete and based on glasshouse plants. We followed sporophyte development in wild populations of Funaria, recording fresh weights of every phenophase. Rates of water loss under laboratory conditions from sporophytes of different ages were recorded, and the ontogeny of the intercellular spaces and the maturational deposition of extra wall materials and waxes were investigated by cryo-SEM. The sporophyte maturation cycle in wild Funaria lasted from December until July (> 200 days), nearly three times that recorded in glasshouses. Fresh weights of green capsules increased until after sporogenesis. Mature brown capsules were highly dehydrated. Prevailing weather conditions or addition of water had no effect on weights. Low rates of water loss, comparable with those from vascular plant leaves, decreased throughout sporophyte maturation under laboratory conditions. These data indicate that Funaria sporophytes mirror homoiohydric vascular plants. Deposition of additional wall materials around the stomatal apertures prevents closure soon after their opening towards the end of post-meiosis capsule expansion. With phenophases similar to those of perennial species, Funaria may not be as much a fugitive species as previously assumed. The very brief window in nascent stomata ontogeny when reversible aperture changes might be possible indicates that the likely principal role of Funaria stomata is facilitation of capsule dehydration and not active regulation of gaseous exchange.
Galactic bars are linked to AGN activity
Creators: name: Margalef-Bentabol, Berta
Publisher: name: Zenodo
Year: 2023

description: Galactic bars are present in more than 50% of disk galaxies and are believed to play an important role in triggering star formation and AGN activity. However, the exact link between them is not well understood at different cosmic times. We study these links on the HSC survey, where it is possible to detect the presence of bars and AGN activity up to redshift 0.8 In order to select our bar sample, we use a deep learning approach, as deep learning methods have proved to have high success for galaxy classification. In particular, we train a CNN model to detect galaxy bars on the HSC survey. We construct a bar sample based on the visual classification from Galaxy Zoo made for SDSS, CANDELS, and DECALS, to cover a broad range in redshift. And use images from the HSC survey along with these classifications of bars to train our CNN model. The trained model is then applied to the whole HSC survey. We compare the bar fractions on AGN and non-AGN galaxies, to understand whether the presence of a bar is connected with AGN activity. Furthermore, we explore the AGN fractions on galaxies identified as bars vs non-bars, to understand if the presence of a bar is the dominant triggering mechanism for AGNs, in particular for low luminosity AGNs.
A review of the genus Glyphomitrium Brid. (Rhabdoweisiaceae, Bryophyta) in the Russian Far East
Creators: name: Fedosov, Vladimir E.
name: Shkurko, Anna V.
name: Ignatova, Elena A.
name: Fedorova, Alina V.
name: Ignatov, Michael S.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: 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
subject: Plant Biology

description: The diversity of the moss genus Glyphomitrium Brid. is concentrated in East Asia. Its range extends to the southern part of the Russian Far East, where its species are rather widespread in hemiboreal coniferous forests. However, the species to which Russian specimens should be assigned remains unclear. A morphological survey was conducted, along with a molecular phylogenetic study based on the plastid trnS–trnF and nuclear ITS regions. Of the three lineages identified, two were investigated using species distribution modelling. For two of three revealed lineages, the use of the names Glyphomitrium crispifolium Nog. (previously considered to be a rare Japanese endemiс) and G. humillimum (Mitt.) Card. are suggested, whereas the third one, which combines excurrent costae of stem leaves and subulate acumina of the perichaetial leaves, is described as a new species, G. ambiguum Fedosov. In Russia, G. crispifolium is mostly associated with the cooler and more humid climate of hemiboreal forests, whereas G. ambiguum occurs in drier conditions in broadleaved forests. Although the niches of G. crispifolium and G. ambiguum were assessed as being rather similar, their ranges overlap weakly. Our results suggest the presence of three species of Glyphomitrium at the northern limit of its distribution in Asia. Results of niche distribution modelling show that the two species’ distributions depend on different predictors, and thus this tool appeared helpful for integrative taxonomic purposes. By contrast, the results of the niche similarity/divergence test were inconclusive.
Gravitational Wave Polarization Modes in $f(R)$ Theories
Creators: name: Kausar, H. Rizwana
name: Philippoz, Lionel
name: Jetzer, Philippe
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Many studies have been carried out in the literature to evaluate the number of polarization modes of gravitational waves in modified theories, in particular in $f(R)$ theories. In the latter ones, besides the usual two transverse-traceless tensor modes present in general relativity, there are two additional scalar ones: a massive longitudinal mode and a massless transverse mode (the so-called breathing mode). This last mode has often been overlooked in the literature, due to the assumption that the application of the Lorenz gauge implies transverse-traceless wave solutions. We however show that this is in general not possible and, in particular, that the traceless condition cannot be imposed due to the fact that we no longer have a Minkowski background metric. Our findings are in agreement with the results found using the Newman-Penrose formalism, and thus clarify the inconsistencies found so far in the literature.
description: 7 pages; accepted for publication in Phys. Rev. D
Oscillation quenching in third order Phase Locked Loop coupled by mean field diffusive coupling
Creators: name: Chakraborty, S
name: Dandapathak, M
name: Sarkar, B C
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We explore analytically the oscillation quenching phenomena (amplitude death and oscillation death) in a coupled third order phase locked loop (PLL) both in periodic and chaotic mode. The phase locked loops are coupled through mean field diffusive coupling. The lower and upper limits of the quenched state are identified in the parameter space of the coupled PLL using Routh-Hurwitz technique. We further observe that the ability of convergence to the quenched state of coupled PLLs depends on the design parameters. For identical system both the system converges to homogeneous steady state whereas for non-identical parameter values they converge to inhomogeneous steady state. It is also observed that for identical systems the quenched state is wider than non-identical case. When the systems parameters are so chosen that each isolated loops are chaotic in nature, in that case we observe the quenched state is relatively narrow. All these phenomena are also demonstrated through numerical simulations.
description: 15 pages
A brief review of E theory
Creators: name: West, Peter
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I begin with some memories of Abdus Salam who was my PhD supervisor. After reviewing the theory of non-linear realisations and Kac-Moody algebras, I explain how to construct the non-linear realisation based on the Kac-Moody algebra E11 and its vector representation. I explain how this field theory leads to dynamical equations which contain an infinite number of fields defined on a space time with an infinite number of coordinates. I then show that these unique dynamical equations, when truncated to low level fields and the usual coordinates of space time, lead to precisely the equations of motion of eleven dimensional supergravity theory. By taking different group decompositions of E11 we find all the maximal supergravity theories, including the gauged maximal supergravities, and as a result the non-linear realisation should be thought of as a unified theory that is the low energy effective action for type II strings and branes. These results essentially confirm the E11 conjecture given many years ago.
description: To appear in the Proceedings of Abdus Salam's 90th Birthday meeting, 25-28 January 2016, NTU, Singapore, Editors L. Brink, M. Duff and K. Phua, World Scientific Publishing
Architecture for Community-scale Critical Infrastructure Coordination for Security and Resilience
Creators: name: Foreman, James Christopher
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cryptography and Security (cs.CR)
subject: Computers and Society (cs.CY)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Our Critical Infrastructure (CI) systems are, by definition, critical to the safe and proper functioning of society. Nearly all of these systems utilize industrial Process Control Systems (PCS) to provide clean water, reliable electricity, critical manufacturing, and many other services within our communities - yet most of these PCS incorporate very little cyber-security countermeasures. Cyber-attacks on CI are becoming an attractive target. While many vendor solutions are starting to be deployed at CI sites, these solutions are largely based on network monitoring for intrusion detection. As such, they are not process-aware, nor do they account for inter dependencies among other CI sites in their community. What is proposed is an architecture for coordinating all CI within a community, which defines characteristics to enhance its integration, its resilience to failure and attack, and its ultimate acceptance by CI operators.
On the connected components of affine Deligne-Lusztig varieties
Creators: name: He, Xuhua
name: Zhou, Rong
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 14G35, 20G25

description: We study the set of connected components of certain unions of affine Deligne-Lusztig varieties arising from the study of Shimura varieties. We determine the set of connected components for basic $\s$-conjugacy classes. As an application, we verify the Axioms in \cite{HR} for certain PEL type Shimura varieties. We also show that for any nonbasic $\s$-conjugacy class in a residually split group, the set of connected components is "controlled" by the set of straight elements associated to the $\s$-conjugacy class, together with the obstruction from the corresponding Levi subgroup. Combined with \cite{Zhou}, this allows one to verify in the residually split case, the description of the mod-$p$ isogeny classes on Shimura varieties conjectured by Langland and Rapoport. Along the way, we determine the Picard group of the Witt vector affine Grassmannian of \cite{BS} and \cite{Zhu} which is of independent interest.
description: 32 pages
title: A unified finite volume framework for phase‐field simulations of an arbitrary number of fluid phases
Creators: name: Bagheri, Milad
name: Stumpf, Bastian
name: Roisman, Ilia V.
name: Dadvand, Abdolrahman
name: Wörner, Martin
name: Marschall, Holger
Publisher: name: John Wiley & Sons
Year: 2022

description: While the phase‐field methodology is widely adopted for simulating two‐phase flows, the simulation of an arbitrary number (N ≥ 2) of fluid phases at physical fidelity is non‐trivial and requires special attention concerning mathematical modelling, numerical discretization, and solution algorithm. We present our most recent work with a focus on validation for multiple immiscible, incompressible, and isothermal phases, enhancing further our library for diffuse interface phase‐field interface capturing methods in OpenFOAM (FOAM‐extend 4.0/4.1). The phase‐field method is an energetic variational formulation based on the work of Cahn and Hilliard where the interface is composed of a physical diffuse layer resembling realistic interfaces. The evolution of the phases is then governed by the minimization of the free energy of the system. The accuracy of the method is demonstrated for a number of test problems, including a floating liquid lens, bubble rise in two stratified layers, and drop impact onto thin liquid film.
Open road - Issue 11, Summer 1980
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Dissenters
valueUri: http://id.worldcat.org/fast/895401
subject: Authority
valueUri: http://id.worldcat.org/fast/821653
subject: Anarchism--Periodicals
valueUri: http://id.worldcat.org/fast/808394
subject: Civil disobedience
valueUri: http://id.worldcat.org/fast/862481
subject: Feminists
valueUri: http://id.worldcat.org/fast/922831
subject: Women and anarchism
valueUri: http://id.worldcat.org/fast/1741687
subject: Anarchism
valueUri: http://id.worldcat.org/fast/808387
subject: Women anarchists
valueUri: http://id.worldcat.org/fast/1177077
subject: Feminism
valueUri: http://id.worldcat.org/fast/922671
subject: Capitalism
valueUri: http://id.worldcat.org/fast/846425
subject: Social movements
valueUri: http://id.worldcat.org/fast/1122657
subject: Anarchists
valueUri: http://id.worldcat.org/fast/808401
subject: World politics
valueUri: http://id.worldcat.org/fast/1181381

description: An anarchist publication produced in Vancouver, British Columbia focused on the international spectrum of anarchist and anti-authoritarian activities around popular struggles and social problems.
description: In this issue: The Blast. "On the road"; "School for big brothers"; "Paper clip gang job"; "Live and let die"; "Anarchist frame-up falls down"; "Patients worry legal pushers"; "Italian cops trample flowers". "Kraakers explode over housing" by Jan Bervoets; "Hidden persuasion & the Parti Quebecois"; "CNT splits"; "Takes two to 'terrorist'?"; "Rhinos waddle for one percent"; "Paper cups work best". Lessons of the 70s/Strategies for the 80s. "Anarcha-feminism: why the hyphen?" by Kytha Kurin; "Bikesheviks: cycling for freedom" by Bob Silverman; "New gulag hists body and soul" by Fred Mobile; "Breaking into prison"; "German war machine targets anti-nukers"; "An open letteer to the ecology movement" by Murray Bookchin; "The promise of the 90's" by John Zerzan; "1980: why am I here?" by Catherine Sand; "Anarchy: an Italian model"; Anarchist literature from the 70's [bibliography]; "Melting down the symbols" [interview with Jan Kinney]. News from nowhere. Books received. Roadside Notes.
Secure Communication in Uplink Transmissions: User Selection and Multiuser Secrecy Gain
Creators: name: Deng, Hao
name: Wang, Hui-Ming
name: Yuan, Jinhong
name: Wang, Wenjie
name: Yin, Qinye
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we investigate secure communications in uplink transmissions, where there are a base station (BS) with M receive antennas, K mobile users each with a single antenna, and an eavesdropper with N receive antennas. The closed-form expressions of the achievable ergodic secrecy sumrates (ESSR) for a random k users selection scheme in the high and low SNR regimes are presented. It is shown that the scaling behavior of ESSR with respect to the number of served users k can be quite different under different system configurations, determined by the numbers of the BS antennas and that of the eavesdropper antennas. In order to achieve a multiuser gain, two low-complexity user selection schemes are proposed under different assumptions on the eavesdropper's channel state information (CSI). The closed-form expressions of the achievable ESSRs and the multiuser secrecy gains of the two schemes are also presented in both low and high SNR regimes. We observe that, as k increases, the multiuser secrecy gain increases, while the ESSR may decrease. Therefore, when N is much larger than M, serving one user with the strongest channel (TDMA-like) is a favourable secrecy scheme, where the ESSR scales with root square of 2 log K.
description: journal paper, double column, 15 pages, 9 figures, accepted for publication on IEEE Transactions on Communications
Ultrafast shift and rectification photocurrents in GaAs quantum wells: Excitation intensity dependence and the importance of bandmixing
Creators: name: Duc, H. T.
name: Podzimski, R.
name: Priyadarshi, S.
name: Bieler, M.
name: Meier, T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: A microscopic approach that is based on the multisubband semiconductor Bloch equations formulated in the basis of a 14-band ${\mathbf k} \cdot {\mathbf p}$ model is employed to compute the temporal dynamics of photocurrents in GaAs quantum wells following the excitation with femtosecond laser pulses. This approach provides a transparent description of the interband, intersubband, and intraband excitations, fully includes all resonant as well as off-resonant excitations, and treats the light-matter interaction non-perturbatively. For linearly polarized excitations the photocurrents contain contributions from shift and rectification currents. We numerically compute and analyze these currents generated by the excitation with femtosecond laser pulses for [110]- and [111]-oriented GaAs quantum wells. It is shown that the often employed perturbative $χ^{(2)}$-approach breaks down for peak fields larger than about 10~kV/cm and that non-perturbative effects lead to a reduction of the peak values of the shift and rectification currents and to temporal oscillations which originate from Rabi flopping. In particular, we find a complex oscillatory photon energy dependence of the magnitudes of the shift and rectification currents. Our simulations demonstrate that this dependence is the result of mixing between the heavy- and light-hole valence bands. This is a surprising finding since the bandmixing has an even larger influence on the strength of the photocurrents than the absorption coefficient. For [110]-oriented GaAs quantum wells the calculated photon energy dependence is compared to experimental results and a good agreement is obtained which validates our theoretical approach.
Stein fillings and SU(2) representations
Creators: name: Baldwin, John A.
name: Sivek, Steven
Publisher: name: arXiv
Year: 2016
Subjects: subject: Symplectic Geometry (math.SG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: We recently defined invariants of contact 3-manifolds using a version of instanton Floer homology for sutured manifolds. In this paper, we prove that if several contact structures on a 3-manifold are induced by Stein structures on a single 4-manifold with distinct Chern classes modulo torsion then their contact invariants in sutured instanton homology are linearly independent. As a corollary, we show that if a 3-manifold bounds a Stein domain that is not an integer homology ball then its fundamental group admits a nontrivial homomorphism to SU(2). We give several new applications of these results, proving the existence of nontrivial and irreducible SU(2) representations for a variety of 3-manifold groups.
description: 53 pages, 8 figures
On Buffer-Aided Multiple-Access Relay Channel
Creators: name: Liu, Rongkuan
name: Popovski, Petar
name: Wang, Gang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The paper treats uplink scenario where M user equipments (UEs) send to a Base Station (BS), possibly via a common Relay Station (RS) that is equipped with a buffer. This is a multiple-access relay channel (MARC) aided by a buffer. We devise a protocol in which the transmission mode is selected adaptively, using the buffer at the RS in order to maximize the average system throughput. We consider the general case in which the RS and the BS can have limits on the maximal number of transmitters that can be received over the multiple access channel. In each slot there are three type possible actions: (A1) multiple UEs transmit at rates that enable BS to decode them (A2) multiple UEs transmit, the BS can only decode the messages partially, while the RS completely; (A3) RS forwards the side information to BS about the partially decoded messages, which are going to be combined and decoded entirely at the BS, while simultaneously a number of UEs sends new messages to the BS. The results show that the adaptive selection of direct and buffer-aided relay transmissions leads to significant average throughput gains.
description: 13 pages, 3 figures, accepted to IEEE Communications letters
Optical observation of spin-density-wave fluctuations in Ba122 iron-based superconductors
Creators: name: Xu, B.
name: Dai, Y. M.
name: Xiao, H.
name: Shen, B.
name: Ye, Z. R.
name: Forget, A.
name: Colson, D.
name: Feng, D. L.
name: Wen, H. H.
name: Qiu, X. G.
name: Lobo, R. P. S. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In iron-based superconductors, a spin-density-wave (SDW) magnetic order is suppressed with doping and unconventional superconductivity appears in close proximity to the SDW instability. The optical response of the SDW order shows clear gap features: substantial suppression in the low-frequency optical conductivity, alongside a spectral weight transfer from low to high frequencies. Here, we study the detailed temperature dependence of the optical response in three different series of the Ba122 system [Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$, Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$ and BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$]. Intriguingly, we found that the suppression of the low-frequency optical conductivity and spectral weight transfer appear at a temperature $T^{\ast}$ much higher than the SDW transition temperature $T_{SDW}$. Since this behavior has the same optical feature and energy scale as the SDW order, we attribute it to SDW fluctuations. Furthermore, $T^{\ast}$ is suppressed with doping, closely following the doping dependence of the nematic fluctuations detected by other techniques. These results suggest that the magnetic and nematic orders have an intimate relationship, in favor of the magnetic-fluctuation-driven nematicity scenario in iron-based superconductors.
description: 6 pages 5 figures
Enhancing light transmission through a random medium with inhomogeneous scattering and loss
Creators: name: Sarma, Raktim
name: Yamilov, Alexey
name: Cao, Hui
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We enhanced the total transmission of light through a disordered waveguide with spatially inhomogeneous scattering and loss by shaping the incident wavefront of a laser beam. Using an on-chip tapered lead, we were able to access all input modes in the waveguide with a spatial light modulator. The adaptive wavefront shaping resulted in selective coupling of input light to high transmission channels, which bypassed the regions of higher scattering and loss in the waveguide. The spatial inhomogeneity of scattering and loss led to redirecting of energy flux to optical paths with less scattering and loss to maximize total energy transported through the system. This work demonstrated the power of wavefront shaping in coherent control of light transport in inhomogeneous scattering media, which are common in real applications.
Modelling the non-steady peeling of viscoelastic tapes
Creators: name: Ceglie, M.
name: Menga, N.
name: Carbone, G.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present a model to study the non-steady V-shaped peeling of a viscoelastic thin tape adhering to a rigid flat substrate. Geometry evolution and viscoelastic creep in the tape are the main features involved in the process, which allows to derive specific governing equations in the framework of energy balance. Finally, these are numerically integrated following an iterative scheme to calculate the process evolution assuming different controlling conditions (peeling front velocity, peeling force, tape tip velocity). Results show that the peeling behavior is strongly affected by viscoelasticity. Specifically, for a given applied force, the peeling can either be prevented, start and stop after some while, or endlessly propagate, depending on the original undeformed tape geometry. Viscoelasticity also entails that the interface toughness strongly increases when the tape tip is fast pulled, which agrees to recent experimental observations on tougher adhesion of natural systems under impact loads, such as see waves and wind gusts.
A Parallelized Vlasov-Fokker-Planck-Solver for Desktop PCs
Creators: name: Schönfeldt, Patrik
name: Brosi, Miriam
name: Schwarz, Markus
name: Steinmann, Johannes L.
name: Müller, Anke-Susanne
Publisher: name: arXiv
Year: 2016
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: The numerical solution of the Vlasov-Fokker-Planck equation is a well established method to simulate the dynamics, including the self-interaction with its own wake field, of an electron bunch in a storage ring. In this paper we present Inovesa, a modularly extensible program that uses OpenCL to massively parallelize the computation. It allows a standard desktop PC to work with appropriate accuracy and yield reliable results within minutes. We provide numerical stability-studies over a wide parameter range and compare our numerical findings to known results. Simulation results for the case of coherent synchrotron radiation will be compared to measurements that probe the effects of the micro-bunching instability occurring in the short bunch operation at ANKA. It will be shown that the impedance model based on the shielding effect of two parallel plates can not only describe the instability threshold, but also the presence of multiple regimes that show differences in the emission of coherent synchrotron radiation.
description: 9 pages, 9 figures, to be submitted to Physical Review Accelerators and Beams
Explicit high-order noncanonical symplectic algorithms for ideal two-fluid systems
Creators: name: Xiao, Jianyuan
name: Qin, Hong
name: Morrison, Philip J.
name: Liu, Jian
name: Yu, Zhi
name: Zhang, Ruili
name: He, Yang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: An explicit high-order noncanonical symplectic algorithm for ideal two-fluid systems is developed. The fluid is discretized as particles in the Lagrangian description, while the electromagnetic fields and internal energy are treated as discrete differential form fields on a fixed mesh. With the assistance of Whitney interpolating forms, this scheme preserves the gauge symmetry of the electromagnetic field, and the pressure field is naturally derived from the discrete internal energy. The whole system is solved using the Hamiltonian splitting method discovered by He et al., which was been successfully adopted in constructing symplectic particle-in-cell schemes. Because of its structure preserving and explicit nature, this algorithm is especially suitable for large-scale simulations for physics problems that are multi-scale and require long-term fidelity and accuracy. The algorithm is verified via two tests: studies of the dispersion relation of waves in a two-fluid plasma system and the oscillating two-stream instability.
Transmission of Spatio-Temporal Correlated Sources Over Fading Multiple Access Channels With DQLC Mappings
Creators: name: Fresnedo, O.
name: Suárez-Casal, P.
name: Castedo, L.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The design of zero-delay Joint Source-Channel Coding (JSCC) schemes for the transmission of correlated information over fading Multiple Access Channels (MACs) is an interesting problem for many communication scenarios like Wireless Sensor Networks (WSNs). Among the different JSCC schemes so far proposed for this scenario, Distributed Quantizer Linear Coding (DQLC) represents an appealing solution since it is able to outperform uncoded transmissions for any correlation level at high Signal-to-Noise Ratios (SNRs) with a low computational cost. In this paper, we extend the design of DQLC-based schemes for fading MACs considering sphere decoding to make the optimal Minimum Mean Squared Error (MMSE) estimation computationally affordable for an arbitrary number of transmit users. The use of sphere decoding also allows to formulate a practical algorithm for the optimization of DQLC-based systems. Finally, non-linear Kalman Filtering for the DQLC is considered to jointly exploit the temporal and spatial correlation of the source symbols. The results of computer experiments show that the proposed DQLC scheme with the Kalman Filter decoding approach clearly outperforms uncoded transmissions for medium and high SNRs.
title: Impact of mixed speed networks on the performance of Ethernet real time communication protocols like PROFINET
Creators: name: Krapp, Lukas
Publisher: name: Hochschule Hannover
Year: 2023
Subjects: subject: 004 Informatik

description: The trend towards the use of Ethernet in automation networks is ongoing. Due to its high flexibility, speed, and bandwidth, Ethernet nowadays is not only widely used in homes and offices worldwide but finding its way into industrial applications. Especially in automation processes, where many field devices send data in relative short time spans, the requirements for a safe and fast data transfer are high. This makes the use of industrial Ethernet essential. A new hardware-layer, specifically tailored for industrial applications, has been introduced in the form of Ethernet-APL (‘Advanced Physical Layer’). Ethernet-APL is based on the Ethernet standard and implements a two-wire Ethernet-based communication for field devices and provides data and power over a two-wire cable. The operation in areas with potentially explosive atmosphere is also possible. This enables a modular, fast, and transparent Ethernet network structure throughout the entire plant. However, by integrating Ethernet-APL into the field, industrial networks in the future will face the challenge of operating at varying datarates at different locations in the network, resulting in a ‘mixed link speed’ network. This can lead to limitations in packet-throughput and consequently to potential packet loss of system relevant data, which must be avoided. Therefore, the purpose of this thesis is to investigate the potential of packet loss in ‘mixed link speed’ networks.
Digitale Archivierung ohne eigenes Archiv?
Creators: name: Trognitz, Martina
Publisher: name: Zenodo
Year: 2019
Subjects: digital archifing
archaeology

description: So wie Funde aufbewahrt und analoges Dokumentationsmaterial aufgehoben und mit Projektende archiviert werden, sollten auch die digitalen Daten, die im Rahmen von archäologischen Ausgrabungen und anderen Projekten entstehen, für die Nachnutzung erhalten werden. In einigen Ländern gibt es bereits bestehende digitale Archive, die sich auf archäologische Daten spezialisiert haben, wie der Archaeology Data Service in York (GB), DANS in Den Haag (NL), the Digital Archaeological Record oder Open Context (US). Auch in Deutschland war eine solche Einrichtung geplant.
 Doch benötigt man für die digitale Archivierung von archäologischen Forschungsdaten eine eigene Einrichtung? Und muss sie fachspezifisch sein? Diesen Fragen soll im Vortrag nachgegangen werden. Dabei soll ein Überblick der bestehenden digitalen Archivierungslandschaft gegeben, Beispiele aus der guten Praxis gezeigt, üblich verwendete Metadatenschemata präsentiert und rechtliche Details erläutert werden. Schlussendlich sollen alternative Wege aufgezeigt werden, die eine nachhaltige und langfristige Speicherung von digitalen Daten auch ohne eigenes Archiv ermöglichen.
Perturbation Theory in Supersymmetric QED: Infrared Divergences and Gauge Invariance
Creators: name: Dine, Michael
name: Draper, Patrick
name: Haber, Howard E.
name: Haskins, Laurel Stephenson
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study some aspects of perturbation theory in $N=1$ supersymmetric abelian gauge theories with massive charged matter. In general gauges, infrared (IR) divergences and nonlocal behavior arise in 1PI diagrams, associated with a $1/k^4$ term in the propagator for the vector superfield. We examine this structure in supersymmetric QED. The IR divergences are gauge-dependent and must cancel in physical quantities like the electron pole mass. We demonstrate that cancellation takes place in a nontrivial way, amounting to a reorganization of the perturbative series from powers of $e^2$ to powers of $e$. We also show how these complications are avoided in cases where a Wilsonian effective action can be defined.
description: 28 pages, 4 figures
Many-particle entanglement criterion for superradiant-like states
Creators: name: Tasgin, Mehmet Emre
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We derive a many-particle inseparability criterion for mixed states using the relation between single-mode and many-particle nonclassicalities. It works very well not only in the vicinity of the Dicke states, but also for the superposition of them: superradiant ground state of finite/infinite number of particles and time evolution of single-photon superradiance. We also obtain a criterion for ensemble-field entanglement which works fine for such kind of states. Even though the collective excitations of the many-particle system is sub-Poissonian --which results in entanglement-- the wave function displays bunching.
description: 7 pages, 6 figures
A non-invasive method for nanoscale electrostatic gating of pristine materials
Creators: name: Beukman, Arjan J. A.
name: Qu, Fanming
name: West, Ken W.
name: Pfeiffer, Loren N.
name: Kouwenhoven, Leo P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Electrostatic gating is essential for defining and control of semiconducting devices. However, nano-fabrication processes required for depositing gates inevitably degrade the pristine quality of the material of interest. Examples of materials that suffer from such degradation include ultra-high mobility GaAs/AlGaAs two-dimensional electron gases (2DEGs), graphene, topological insulators, and nanowires. To preserve the pristine material properties, we have developed a flip-chip setup where gates are separated from the material by a vacuum, which allows nanoscale electrostatic gating of the material without exposing it to invasive nano-processing. An additional benefit is the vacuum between gates and material, which, unlike gate dielectrics, is free from charge traps. We demonstrate the operation and feasibility of the flip-chip setup by achieving quantum interference at integer quantum Hall states in a Fabry-Pérot interferometer based on a GaAs/AlGaAs 2DEG. Our results pave the way for the study of exotic phenomena including fragile fractional quantum Hall states by preserving the high quality of the material.
description: 25 pages including Supporting Information
Report on simplified models for the estimation of seismic functional and systemic losses
Creators: name: D'Ayala, Dina
name: Sun, Li
name: Fayjaloun, Rosemary
name: Gehl, Pierre
name: Dragos Toma-Danila
name: Morga, Mariantonietta
name: Borzi, Barbara
name: Bozzoni, Francesca
name: Di Meo, Antonella
name: Faravelli, Marta
name: Ozcebe, Ali G.
name: Halldórsson, Benedikt
name: Atefe Darzi
name: Þorvaldsdóttir, Sólveig
name: Ozer, Ekin
name: Tubaldi, Enrico
name: Melad Haweyou
name: Schwarz, Jochen
name: Abrahamczyk, Lars
name: Martinelli, Mario
name: Korff, Mandy
Publisher: name: Zenodo
Year: 2021

description: TURNkey
 Deliverable D 4.3 Report on simplified models for the estimation of seismic functional and systemic losses The WP4 objective is to develop a procedure for the rapid prediction of losses immediately following an earthquake, while accounting for field observations and structural monitoring to update the loss models to be included in the TURNkey FWCR platform. This framework is articulated in two main components, of which the first is the development of predictive models for the vulnerability and loss estimation of exposed assets. This component includes the physical vulnerability of single elements, as well as the systemic vulnerability and functionality loss of interconnected infrastructure, due to the importance of the latter when conducting rapid response operations. The models are selected on the basis of their applicability/usability with reference to the Test Beds (TBs). The objective is to improve existing models with a focus on simplicity and applicability for various types of exposure data and to harmonise the input-output data for use on the TURNkey FWCR platform. The present deliverable, companion to deliverable D4.2, collects specifically literature and documentation relevant to the definition of functionality losses for the systems present in the TBs of the TURNkey project. It also shows how such models are used within the TBs.
 In section 2 information is arranged by structural typology, infrastructure typology, and use of the infrastructure while a separate subsection reviews the specific work applicable at the infrastructure system level. Section 3 exemplify the application to the specific TB. It should be noted that given the nature of the TBs and the planned work in relation to them, structural and infrastructural typologies are only specific to one or two TBs, and not all TBs have focused their work on studying the specific functionality losses of the infrastructure pertaining to their site.