cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Exploring Synchronization in Complex Oscillator Networks
Creators: name: Dörfler, Florian
name: Bullo, Francesco
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optimization and Control (math.OC)
subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The emergence of synchronization in a network of coupled oscillators is a pervasive topic in various scientific disciplines ranging from biology, physics, and chemistry to social networks and engineering applications. A coupled oscillator network is characterized by a population of heterogeneous oscillators and a graph describing the interaction among the oscillators. These two ingredients give rise to a rich dynamic behavior that keeps on fascinating the scientific community. In this article, we present a tutorial introduction to coupled oscillator networks, we review the vast literature on theory and applications, and we present a collection of different synchronization notions, conditions, and analysis approaches. We focus on the canonical phase oscillator models occurring in countless real-world synchronization phenomena, and present their rich phenomenology. We review a set of applications relevant to control scientists. We explore different approaches to phase and frequency synchronization, and we present a collection of synchronization conditions and performance estimates. For all results we present self-contained proofs that illustrate a sample of different analysis methods in a tutorial style.
The non-thermal emission from the colliding-wind binary Apep
Creators: name: del Palacio, S.
name: Benaglia, P.
name: De Becker, M.
name: Bosch-Ramon, V.
name: Romero, G. E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The recently discovered massive binary system Apep is the most powerful synchrotron emitter among the known Galactic colliding-wind binaries. This makes this particular system of great interest to investigate stellar winds and the non-thermal processes associated with their shocks. This source was detected at various radio bands, and in addition the wind-collision region was resolved by means of very-long baseline interferometric observations. We use a non-thermal emission model for colliding-wind binaries to derive physical properties of this system. The observed morphology in the resolved maps allows us to estimate the system projection angle on the sky to be $ψ\approx 85^\circ$. The observed radio flux densities also allow us to characterise both the intrinsic synchrotron spectrum of the source and its modifications due to free--free absorption in the stellar winds at low frequencies; from this we derive mass-loss rates of the stars of $\dot{M}_\mathrm{WN} \approx 4\times10^{-5}$ $\mathrm{M}_\odot$ yr$^{-1}$ and $\dot{M}_\mathrm{WC} \approx 2.9\times10^{-5}$ $\mathrm{M}_\odot$ yr$^{-1}$. Finally, the broadband spectral energy distribution is calculated for different combinations of the remaining free parameters, namely the intensity of the magnetic field and the injected power in non-thermal particles. We show that the degeneracy of these two parameters can be solved with observations in the high-energy domain, most likely in the hard X-rays but also possibly in $γ$-rays under favourable conditions.
description: 10 pages, 5 figures, 2 tables. This version has been accepted for publication in PASA after improvements and updates in the discussion of the results
Broadband optical isolator in fibre optics
Creators: name: Berent, Michal
name: Rangelov, Andon A.
name: Vitanov, Nikolay V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We propose a broadband optical diode, which is composed of one achromatic reciprocal quarter-wave plate and one non-reciprocal quarter-wave plate, both placed between two crossed polarizers. The presented design of achromatic wave plates relies on an adiabatic evolution of the Stokes vector, thus, the scheme is robust and efficient. The possible simple implementation using fiber optics is suggested.
description: Version as published in Journal of Optics
Can structure formation distinguish ΛCDM from non-minimal f(R) Gravity?
Creators: name: Thakur, Shruti
name: Sen, Anjan A
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Non-minimally coupled f(R) gravity model is an interesting approach to explain the late time acceleration of the Universe without introducing any exotic matter component in the energy budget of the Universe. But distinguishing such model with the concordance ΛCDM model using present observational data is a serious challenge. In this paper, we address this issue using the observations related to the growth of matter over density g(z) as measured by different galaxy surveys. As background cosmology is not sufficient to distinguish different dark energy models, we first find out the functional form for f(R) (which is non-minimally coupled to the matter lagrangian) that produces the similar background cosmology as in ΛCDM. Subsequently we calculate the growth for the matter over density g(z) for such non minimally coupled f(R) models and compare them with the ΛCDM Universe. We also use the measurements of g(z)σ_{8}(z) by different galaxy surveys to reconstruct the behavior for g(z) and σ_{8}(z) for both the non-minimally coupled f(R) gravity models as well as for the ΛCDM. Our results show that there is a small but finite window where one can distinguish the non-minimally coupled f(R) models with the concordance ΛCDM.
description: 7 pages, Revtex4 style, 5 eps figures, Revised Version, Accepted For Publication In Physical Review D
Exploiting self-organized criticality in strongly stratified turbulence
Creators: name: Chini, Gregory P.
name: Michel, Guillaume
name: Julien, Keith
name: Rocha, Cesar B.
name: Caulfield, Colm-cille P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: A multiscale reduced description of turbulent free shear flows in the presence of strong stabilizing density stratification is derived via asymptotic analysis of the Boussinesq equations in the simultaneous limits of small Froude and large Reynolds numbers. The analysis explicitly recognizes the occurrence of dynamics on disparate spatiotemporal scales, yielding simplified partial differential equations governing the coupled evolution of slow large-scale hydrostatic flows and fast small-scale isotropic instabilities and internal waves. The dynamics captured by the coupled reduced equations is illustrated in the context of two-dimensional strongly stratified Kolmogorov flow. A noteworthy feature of the reduced model is that the fluctuations are constrained to satisfy quasilinear (QL) dynamics about the comparably slowly-varying large-scale fields. Crucially, this QL reduction is not invoked as an ad hoc closure approximation, but rather is derived in a physically relevant and mathematically consistent distinguished limit. Further analysis of the resulting slow-fast QL system shows how the amplitude of the fast stratified-shear instabilities is slaved to the slowly-evolving mean fields to ensure the marginal stability of the latter. Physically, this marginal stability condition appears to be compatible with recent evidence of self-organized criticality in both observations and simulations of stratified turbulence. lgorithmically, the slaving of the fluctuation fields enables numerical simulations to be time-evolved strictly on the slow time scale of the hydrostatic flow. The reduced equations thus provide a solid mathematical foundation for future studies of three-dimensional strongly stratified turbulence in extreme parameter regimes of geophysical relevance and suggest avenues for new sub-grid-scale parameterizations.
Co-evolution of networks and quantum dynamics: a generalization of preferential attachment
Creators: name: Nicosia, Vincenzo
name: Machida, Takuya
name: Wilson, Richard
name: Hancock, Edwin
name: Konno, Norio
name: Latora, Vito
name: Severini, Simone
Publisher: name: arXiv
Year: 2013
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a model of network growth in which the network is co-evolving together with the dynamics of a quantum mechanical system, namely a quantum walk taking place over the network. The model naturally generalizes the Barabási-Albert model of preferential attachment and has a rich set of tunable parameters, such as the initial conditions of the dynamics or the interaction of the system with its environment. We show that the model produces networks with two-modal power-law degree distributions, super-hubs, finite clustering coefficient, small-world behaviour and non-trivial degree-degree correlations.
description: 8 pages, 2 figures
Span of a Graph: Keeping the Safety Distance
Creators: name: Banič, Iztok
name: Taranenko, Andrej
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C60, 05C90

description: Inspired by Lelek's idea from [Disjoint mappings and the span of spaces, Fund. Math. 55 (1964), 199 -- 214], we introduce the novel notion of the span of graphs. Using this, we solve the problem of determining the \emph{maximal safety distance} two players can keep at all times while traversing a graph. Moreover, their moves must be made with respect to certain move rules. For this purpose, we introduce different variants of a span of a given connected graph. All the variants model the maximum safety distance kept by two players in a graph traversal, where the players may only move with accordance to a specific set of rules, and their goal: visit either all vertices, or all edges. For each variant, we show that the solution can be obtained by considering only connected subgraphs of a graph product and the projections to the factors. We characterise graphs in which it is impossible to keep a positive safety distance at all moments in time. Finally, we present a polynomial time algorithm that determines the chosen span variant of a given graph.
description: Discrete Mathematics and Theoretical Computer Science vol. 25:1 #8 (2023)
Die Kunst- und Geschichts-Denkmäler des Kreises Warendorf. Im Aufträge der Commission zur Erforschung der provinzialen Kunst- und Geschichtsdenkmäler bearbeitet von Dr. J. B. Nordhoff
Creators: name: Lehfeldt, Paul
Publisher: name: Bonner Jahrbücher
Year: 2018

description: Rezension zu: Die Kunst- und Geschichts-Denkmäler des Kreises Warendorf. Im Aufträge der Commission zur Erforschung der provinzialen Kunst- und Geschichtsdenkmäler bearbeitet von Dr. J. B. Nordhoff, Professor an der königl. Akademie zu Münster. Münster i. W. Commissionsverlag der Coppenrath’schen Buch- und Kunsthandlung 1886.
description: Bonner Jahrbücher, Bd. 82 (1886): Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Measuring the Kerr spin parameter of a non-Kerr compact object with the continuum-fitting and the iron line methods
Creators: name: Bambi, Cosimo
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Under the assumption that astrophysical black hole candidates are the Kerr black holes of general relativity, the continuum-fitting method and the analysis of the K$α$ iron line are today the only available techniques capable of providing a relatively reliable estimate of the spin parameter of these objects. If we relax the Kerr black hole hypothesis and we try to test the nature of black hole candidates, we find that there is a strong correlation between the measurement of the spin and possible deviations from the Kerr solution. The properties of the radiation emitted in a Kerr spacetime with spin parameter $a_*$ are indeed very similar, and practically indistinguishable, from the ones of the radiation emitted around a non-Kerr object with different spin. In this paper, I address the question whether measuring the Kerr spin with both the continuum-fitting method and the K$α$ iron line analysis of the same object can be used to claim the Kerr nature of the black hole candidate in the case of consistent results. In this work, I consider two non-Kerr metrics and it seems that the answer does depend on the specific background. The two techniques may either provide a very similar result (the case of the Bardeen metric) or show a discrepancy (Johannsen-Psaltis background).
description: 1+14 pages, 5 figures. v2: refereed version
Building a weak shockwave from linear modes
Creators: name: Bret, Antoine
name: Narayan, Ramesh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Classical Physics (physics.class-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: In shockwave theory, the density, velocity and pressure jumps are derived from the conservation equations. Here, we address the physics of a weak shock the other way around. We first show that the density profile of a weak shockwave in a fluid can be expressed as a sum of linear acoustic modes. The shock so built propagates at the speed of sound and matter is exactly conserved at the front crossing. Yet, momentum and energy are only conserved up to order 0 in powers of the shock amplitude. The density, velocity and pressure jumps are similar to those of a fluid shock, and an equivalent Mach number can be defined. A similar process is possible in magnetohydrodynamic. Yet, such a decomposition is found impossible for collisionless shocks due to the dispersive nature of ion acoustic waves. Weakly nonlinear corrections to their frequency do not solve the problem. Weak collisionless shocks could be inherently nonlinear, non-amenable to any linear superposition. Or they could be nonexistent, as hinted by recent works.
description: 8 pages, 2 figures, to appear in Journal of Plasma Physics
Die Winckelmanns-Feier in Bonn am 9. Dezember 1886
Creators: name: Redaktion, Die
Publisher: name: Bonner Jahrbücher
Year: 2018

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 82 (1886): Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Edge Computing and Communication for Energy-Efficient Earth Surveillance with LEO Satellites
Creators: name: Martinez-Gost, Marc
name: Leyva-Mayorga, Israel
name: Pérez-Neira, Ana
name: Vázquez, Miguel Ángel
name: Soret, Beatriz
name: Moretti, Marco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Modern satellites deployed in low Earth orbit (LEO) accommodate processing payloads that can be exploited for edge computing. Furthermore, by implementing inter-satellite links, the LEO satellites in a constellation can route the data end-to-end (E2E). These capabilities can be exploited to greatly improve the current store-and-forward approaches in Earth surveillance systems. However, they give rise to an NP-hard problem of joint communication and edge computing resource management (RM). In this paper, we propose an algorithm that allows the satellites to select between computing the tasks at the edge or at a cloud server and to allocate an adequate power for communication. The overall objective is to minimize the energy consumption at the satellites while fulfilling specific service E2E latency constraints for the computing tasks. Experimental results show that our algorithm achieves energy savings of up to 18% when compared to the selected benchmarks with either 1) fixed edge computing decisions or 2) maximum power allocation.
description: Accepted in ICC Workshops 2022
Jonische Bauten Kleinasiens und der Aufbau des Mausoleums von Halikarnass. Vortrag gehalten am 21. Januar 1923 im Verein von Altertumsfreunden im Rheinlande
Creators: name: Krischen, Fritz
Publisher: name: Bonner Jahrbücher
Year: 2018

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 128 (1923): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Lattice QCD study on $K^\ast(892)$ meson decay width
Creators: name: Fu, Ziwen
name: Fu, Kan
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We deliver an exploratory lattice QCD examination of the $K^\ast(892)$ meson decay width with the help of the p-wave scattering phase $δ_1$ of pion-kaon ($πK$) system in the isospin $I=1/2$ channel, which are extracted by the modified Rummukainen-Gottlieb formula for two-particle system with arbitrary mass, and it clearly reveals the entity of a resonance at a mass around $K^\ast(892)$ meson mass. The effective range formula is applied to describe the energy dependence of the scattering phase and we obtain the effective $K^\ast \to πK$ coupling constant as $g_{K^\ast πK} = 6.38(78)$, and subsequently achieve the decay width to be $64.9 \pm 8.0$ MeV, which is in reasonable accordance with the current experiment. Our lattice investigations are conducted on a $20^3\times48$ MILC full QCD gauge configuration at $(m_π+ m_K) / m_{K^\ast} \approx 0.739$ and the lattice spacing $a \approx 0.15$ fm.
description: Correct some typos and replace some figures with high quality ones
title: PDS4 Planetary Science Data Provider's Handbook (DPH) - Version 1.16.0
Creators: name: NASA PDS4 Data Design Working Group
Publisher: name: NASA Planetary Data System
Year: 2021
Subjects: 1.16.0
2021
PDS
PDS4
data
dph
handbook
pds4
provider's
version

description: PDS4 Data Provider's Handbook (DPH) version 1.16.0; 2021
Christoph J. Raub 1932–2014
Creators: name: Blumer, Rolf-Dieter
name: Zielonka, A.
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2018

description: [nicht vorhanden / not available]
description: Fundberichte aus Baden-Württemberg, Bd. 34, Nr. 2 (2014): Fundberichte aus Baden-Württemberg
Second-order conditions for non-uniformly convex integrands: quadratic growth in $L^1$
Creators: name: Wachsmuth, Daniel
name: Wachsmuth, Gerd
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 49J53, 49J52, 49K30

description: We study no-gap second-order optimality conditions for a non-uniformly convex and non-smooth integral functional. The integral functional is extended to the space of measures. The obtained second-order derivatives contain integrals on lower-dimensional manifolds. The proofs utilize the convex pre-conjugate, which is an integral functional on the space of continuous functions. Applications to non-smooth optimal control problems are given.
Pivotal role of median eminence tanycytes for hypothalamic function and neurogenesis
Creators: name: Rizzoti, Karine
name: Lovell-Badge, Robin
Publisher: name: The Francis Crick Institute
Year: 2021
Subjects: subject: Neurosciences
subject: FOS: Clinical medicine
subject: Model organisms
subject: Tumour Biology
subject: Genetics & Genomics
subject: Developmental Biology
subject: Stem Cells

description: Along with the sub-ventricular zone of the forebrain lateral ventricles and the sub-granular zone of the dentate gyrus in the hippocampus, the hypothalamus has recently emerged as a third gliogenic and neurogenic niche in the central nervous system. The hypothalamus is the main regulator of body homeostasis because it centralizes peripheral information to regulate crucial physiological functions through the pituitary gland and the autonomic nervous system. Its ability to sense signals originating outside the brain relies on its exposure to blood-born molecules through the median eminence, which is localized outside the blood brain barrier. Within the hypothalamus, a population of specialized radial glial cells, the tanycytes, control exposure to blood-born signals by acting both as sensors and regulators of the hypothalamic input and output. In addition, lineage-tracing experiments have recently revealed that tanycytes represent a population of hypothalamic stem cells, defining them as a pivotal cell type within the hypothalamus. Hypothalamic neurogenesis has moreover been shown to have an important role in feeding control and energy metabolism, which challenges previous knowledge and offers new therapeutic options.
title: Embedding Life Cycle Costing in 5D BIM
Creators: name: Kehily, Dermot
name: Underwood, Jason
Publisher: name: Technological University Dublin
Year: 2017

description: Life Cycle Costing (LCC) is the consideration of all ‘relevant’ costs and revenues associated with the acquisition and ownership of an asset. LCC has a number of relevant applications, these include project appraisal; facilities management; procurement and tendering and as a means to evaluate sustainable construction. Although these advantages are well recognised, the process is underutilised due to a number of documented barriers to adoption. Notably these include lack of accurate historical databases; the perceived complexity and time consuming nature of the calculations; lack of a standard LCC methodology, and that clients are not requesting LCC. The research presented is framed in recognition of these barriers, investigating a process that could affect change by increasing efficiency in this area. A Building Information Modelling (BIM) approach to construction procurement is being increasingly utilised as a collaborative set of procedures and associated technologies that assist design and construction professions in conceiving, designing, constructing and operating the built environment. Although 5D BIM (Cost Modelling) is currently being used in Quantity Surveying (QS) practice, BIM is not extensively used in the application of LCC and there has been limited research in this area to date. The research demonstrates the development of a 5D BIM based LCC solution, where LCC is integrated into the 5D BIM process by embedding an LCC calculation model structure within an existing 5D BIM technology. This process represents a change to the 5D BIM workflow, adding on a facility for LCC through post-processing BIM data. The research is carried out under a design science research methodology, to develop and then evaluate the solution proposed. An evaluation method known as ‘Thinking Aloud cooperative evaluation’ is used to gain feedback from a sample of QSs utilising the 5D BIM based LCC solution. The purpose of the evaluation is to gauge whether LCC can be effectively embedded in a 5D BIM platform. The contribution to knowledge is the articulation of a process which extends 5D BIM for LCC, by leveraging an existing 5D BIM technology. The findings outline that the primary benefits of the proposed process/system is that it allows for a link between the QSs cost plans/BOQ’s and their LCC calculations in an integrated environment.
The 3.3 micron PAH Emission as a Star Formation Rate Indicator
Creators: name: Kim, Ji Hoon
name: Im, Myungshin
name: Lee, Hyung Mok
name: Lee, Myung Gyoon
name: Jun, Hyunsung David
name: Nakagawa, Takao
name: Matsuhara, Hideo
name: Wada, Takehiko
name: Oyabu, Shinki
name: Takagi, Toshinobu
name: Inami, Hanae
name: Ohyama, Youichi
name: Yamada, Rika
name: Helou, George
name: Armus, Lee
name: Shi, Yong
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Polycyclic Aromatic Hydrocarbon (PAH) emission features dominate the mid-infrared spectra of star-forming galaxies and can be useful to calibrate star formation rates and diagnose ionized states of grains. However, the PAH 3.3 micron feature has not been studied as much as other PAH features since it is weaker than others and resides outside of Spitzer capability. In order to detect and calibrate the 3.3 micron PAH emission and investigate its potential as a star formation rate indicator, we carried out an AKARI mission program, AKARI mJy Unbiased Survey of Extragalactic Survey (AMUSES) and compare its sample with various literature samples. We obtained 2 ~5 micron low resolution spectra of 20 flux-limited galaxies with mixed SED classes, which yields the detection of the 3.3 micron PAH emission from three out of 20 galaxies. For the combined sample of AMUSES and literature samples, the 3.3 micron PAH luminosities correlate with the infrared luminosities of star-forming galaxies, albeit with a large scatter (1.5 dex). The correlation appears to break down at the domain of ultra-luminous infrared galaxies (ULIRGs), and the power of the 3.3 micron PAH luminosity as a proxy for the infrared luminosity is hampered at log[L(PAH3.3)/(erg/sec)] > -42.0. Possible origins for this deviation in the correlation are discussed, including contribution from AGN and strongly obscured YSOs, and the destruction of PAH molecules in ULIRGs.
description: 16 pages; 2 tables; 6 figures; emulateapj.cls; Accepted for publication in the Astrophysical Journal
title: PDS4 Planetary Science Data Provider's Handbook (DPH) - Version 1.17.0
Creators: name: NASA PDS4 Data Design Working Group
Publisher: name: NASA Planetary Data System
Year: 2021
Subjects: 1.17.0
2021
PDS
PDS4
data
dph
handbook
pds4
provider's
version

description: PDS4 Data Provider's Handbook (DPH) version 1.17.0; 2021
A Circuit-based Model for the Interpretation of Perfect Metamaterial Absorbers
Creators: name: Costa, Filippo
name: Genovesi, Simone
name: Monorchio, Agostino
name: Manara, Giuliano
Publisher: name: arXiv
Year: 2012
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: A popular absorbing structure, often referred to as Perfect Metamaterial Absorber, comprising metallic periodic pattern over a thin low-loss grounded substrate is studied by resorting to an efficient transmission line model. This approach allows the derivation of simple and reliable closed formulas describing the absorption mechanism of the subwavelength structure. The analytic form of the real part of the input impedance is explicitly derived in order to explain why moderate losses of the substrate is sufficient to achieve matching with free space, that is, perfect absorption. The effect of the constituent parameters for tuning the working frequency and tailoring the absorption bandwidth is addressed. It is also shown that the choice of highly capacitive coupled elements allows obtaining the largest possible bandwidth whereas a highly frequency selective design is achieved with low capacitive elements like a cross array. Finally, the angular stability of the absorbing structure is investigated.
description: Accepted for publication on IEEE Transactions on Antennas and Propagation
Eine vorgeschichtliche und frühmittelalterliche Siedlung von Heddesheim, Rhein-Neckar-Kreis
Creators: name: König, Peter
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2018

description: [nicht vorhanden / not available]
description: Fundberichte aus Baden-Württemberg, Bd. 35 (2015): Fundberichte aus Baden-Württemberg
title: Design Science: Choosing an appropriate methodology for research in BIM
Creators: name: Kehily, Dermot
name: Underwood, Jason
Publisher: name: Technological University Dublin
Year: 2015

description: This paper discusses Building Information Modelling (BIM) in relation to proposing design science as a methodology for BIM research. The paper firstly outlines how BIM is changing construction work practices to a more collaborative and integrated set of procedures, facilitated through the application of modelling technologies. The use of traditional research methods for BIM research in the context of developing and subsequently evaluating a BIM process or technology is then questioned. The premise of this rationale is that BIM revolves around new practices and emerging technologies that propose to provide efficiency in delivering constructed assets in the built environment. Traditional academic research methods tend to focus on existing reality, which seeks to explain the existence of phenomenon in the built environment. However, BIM focuses on a new reality through a change in current work practices, thus, a methodology which facilitates an evaluation of this new reality is necessary. A practical approach to research is discussed whereby there is more participation in the research process by the researcher. Design science is a research methodology, which emanates from a practical research philosophy and outlines a formulated process for developing and evaluating a BIM technology or practice. This paper presents a four staged process to design sciences that could be implemented when developing and evaluating a BIM artifact.
Solving Infinite Games in the Baire Space
Creators: name: Brütsch, Benedikt
name: Thomas, Wolfgang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Infinite games (in the form of Gale-Stewart games) are studied where a play is a sequence of natural numbers chosen by two players in alternation, the winning condition being a subset of the Baire space $ω^ω$. We consider such games defined by a natural kind of parity automata over the alphabet $\mathbb{N}$, called $\mathbb{N}$-MSO-automata, where transitions are specified by monadic second-order formulas over the successor structure of the natural numbers. We show that the classical Büchi-Landweber Theorem (for finite-state games in the Cantor space $2^ω$) holds again for the present games: A game defined by a deterministic parity $\mathbb{N}$-MSO-automaton is determined, the winner can be computed, and an $\mathbb{N}$-MSO-transducer realizing a winning strategy for the winner can be constructed.
description: Updated header on title page. 26 pages, 1 figure
title: PDS4 Planetary Science Data Provider's Handbook (DPH) - Version 1.18.0
Creators: name: NASA PDS4 Data Design Working Group
Publisher: name: NASA Planetary Data System
Year: 2022
Subjects: 1.18.0
2022
PDS
PDS4
data
dph
handbook
pds4
provider's
version

description: PDS4 Data Provider's Handbook (DPH) version 1.18.0; 2022
Deconfined Global Types for Asynchronous Sessions
Creators: name: Dagnino, Francesco
name: Giannini, Paola
name: Dezani-Ciancaglini, Mariangiola
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Multiparty sessions with asynchronous communications and global types play an important role for the modelling of interaction protocols in distributed systems. In designing such calculi the aim is to enforce, by typing, good properties for all participants, maximising, at the same time, the accepted behaviours. Our type system improves the state-of-the-art by typing all asynchronous sessions and preserving the key properties of Subject Reduction, Session Fidelity and Progress when some well-formedness conditions are satisfied. The type system comes together with a sound and complete type inference algorithm. The well-formedness conditions are undecidable, but an algorithm checking an expressive restriction of them recovers the effectiveness of typing.
title: Social work values for the XXI century : human rights and the ethic of the gift
Creators: name: Trenkwalder-Egger, Andrea
Publisher: name: Universidade Lusíada Editora
Year: 2011

description: Intervenção social. - ISSN 0874-1611. - N. 38 (2.º semestre 2011). - p. 25-34.
Dynamical correction to linear Kohn-Sham conductances from static density functional theory
Creators: name: Kurth, S.
name: Stefanucci, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: For molecules weakly coupled to leads the exact linear Kohn-Sham (KS) conductance can be orders of magnitude larger than the true linear conductance due to the lack of dynamical exchange-correlation (xc) corrections. In this work we show how to incorporate dynamical effects in KS transport calculations. The only quantity needed is the static xc potential in the molecular junction. Our scheme provides a comprehensive description of Coulomb blockade without breaking the spin symmetry. This is explicitly demonstrated in single-wall nanotubes where the corrected conductance is in good agreement with experimental data whereas the KS conductance fails dramatically.
description: 5 pages (4 figures) + 3 pages (2 figures) Supplemental Material
Low-Cost Bluetooth Mobile Positioning for Location-based Application
Creators: name: Barahim, Zaafir
name: Doomun, M. Razvi
name: Joomun, Nazrana
Publisher: name: arXiv
Year: 2012
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Bluetooth is a promising short-range radio network technology. We present a low cost and easily deployed, scalable infrastructure for indoor location-based computing of mobile devices based on Bluetooth technology. The system consists of 2 main components, namely the Bluetooth (BT) Sensor System and the Central Navigation System which have been developed using the JDK 6.0. The Bluetooth Sensor System allows mobile devices whose Bluetooth mode is set to discoverable, to be scanned and detected, and they receive customizable text message of their positioning information, e.g. room identity. The positioning information is also sent to the Central Navigation System which in turn displays and updates the navigation map. The system is also used to track the movement of different BT mobile devices within the implemented environment.
description: 4 pages 3rd IEEE/IFIP International Conference in Central Asia on Internet 2007, ICI 2007
title: PDS4 Planetary Science Data Provider's Handbook (DPH) - Version 1.19.0
Creators: name: NASA PDS4 Data Design Working Group
Publisher: name: NASA Planetary Data System
Year: 2022
Subjects: 1.19.0
2022
PDS
PDS4
data
dph
handbook
pds4
provider's
version

description: PDS4 Data Provider's Handbook (DPH) version 1.19.0; 2022
Confined self-propulsion of an isotropic active colloid
Creators: name: Picella, Francesco
name: Michelin, Sebastien
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: To spontaneously break their intrinsic symmetry and self-propel at the micron scale, isotropic active colloidal particles and droplets exploit the non-linear convective transport of chemical solutes emitted/consumed at their surface by the surface-driven fluid flows generated by these solutes. Significant progress was recently made to understand the onset of self-propulsion and non-linear dynamics. Yet, most models ignore a fundamental experimental feature, namely the spatial confinement of the colloid, and its effect on propulsion. In this work, the self-propulsion of an isotropic colloid inside a capillary tube is investigated numerically. A flexible computational framework is proposed based on a finite-volume approach on adaptative octree-grids and embedded boundary methods. This method is able to account for complex geometric confinement, the nonlinear coupling of chemical transport and flow fields, and the precise resolution of the surface boundary conditions, that drive the system's dynamics. Somewhat counter-intuitively, spatial confinement promotes the colloid's spontaneous motion by reducing the minimum advection-to-diffusion ratio or Pćlet number, Pe, required to self-propel; furthermore, self-propulsion velocities are significantly modified as the colloid-to-capillary size ratio $κ$ is increased, reaching a maximum at fixed Pe for an optimal confinement $0<κ<1$. These properties stem from a fundamental change in the dominant chemical transport mechanism with respect to the unbounded problem : with diffusion now restricted in most directions by the confining walls, the excess solute is predominantly convected away downstream from the colloid, enhancing front-back concentration contrasts. These results are confirmed quantitatively using conservation arguments and lubrication analysis of the tightly-confined limit, $κ\rightarrow 1$.
description: 23 pages, 13 figures, to appear in Journal of Fluid Mechanics
Clustering Geometrically-Modeled Points in the Aggregated Uncertainty Model
Creators: name: Keikha, Vahideh
name: Aghamolaei, Sepideh
name: Mohades, Ali
name: Ghodsi, Mohammad
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Geometry (cs.CG)
subject: FOS: Computer and information sciences

description: The $k$-center problem is to choose a subset of size $k$ from a set of $n$ points such that the maximum distance from each point to its nearest center is minimized. Let $Q=\{Q_1,\ldots,Q_n\}$ be a set of polygons or segments in the region-based uncertainty model, in which each $Q_i$ is an uncertain point, where the exact locations of the points in $Q_i$ are unknown. The geometric objects segments and polygons can be models of a point set. We define the uncertain version of the $k$-center problem as a generalization in which the objective is to find $k$ points from $Q$ to cover the remaining regions of $Q$ with minimum or maximum radius of the cluster to cover at least one or all exact instances of each $Q_i$, respectively. We modify the region-based model to allow multiple points to be chosen from a region and call the resulting model the aggregated uncertainty model. All these problems contain the point version as a special case, so they are all NP-hard with a lower bound 1.822. We give approximation algorithms for uncertain $k$-center of a set of segments and polygons. We also have implemented some of our algorithms on a data-set to show our theoretical performance guarantees can be achieved in practice.
description: Accepted in Fundamenta Informaticae
Lasing and antibunching of optical phonons in semiconductor double quantum dots
Creators: name: Okuyama, Rin
name: Eto, Mikio
name: Brandes, Tobias
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically propose optical phonon lasing in a double quantum dot (DQD) fabricated on a semiconductor substrate. No additional cavity or resonator is required. An electron in the DQD is found to be coupled to only two longitudinal optical phonon modes that act as a natural cavity. When the energy level spacing in the DQD is tuned to the phonon energy, the electron transfer is accompanied by the emission of the phonon modes. The resulting non-equilibrium motion of electrons and phonons is analyzed by the rate equation approach based on the Born-Markov-Secular approximation. We show that the lasing occurs for pumping the DQD via electron tunneling at rate much larger than the phonon decay rate, whereas a phonon antibunching is observed in the opposite regime of slow tunneling. Both effects disappear by an effective thermalization induced by the Franck-Condon effect in a DQD fabricated in a suspended carbon nanotube with strong electron-phonon coupling.
description: 27 pages, 8 figures
Robustly Self-Ordered Graphs: Constructions and Applications to Property Testing
Creators: name: Goldreich, Oded
name: Wigderson, Avi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences

description: A graph $G$ is called self-ordered (a.k.a asymmetric) if the identity permutation is its only automorphism. Equivalently, there is a unique isomorphism from $G$ to any graph that is isomorphic to $G$. We say that $G=(V,E)$ is robustly self-ordered if the size of the symmetric difference between $E$ and the edge-set of the graph obtained by permuting $V$ using any permutation $π:V\to V$ is proportional to the number of non-fixed-points of $π$. In this work, we initiate the study of the structure, construction and utility of robustly self-ordered graphs. We show that robustly self-ordered bounded-degree graphs exist (in abundance), and that they can be constructed efficiently, in a strong sense. Specifically, given the index of a vertex in such a graph, it is possible to find all its neighbors in polynomial-time (i.e., in time that is poly-logarithmic in the size of the graph). We also consider graphs of unbounded degree, seeking correspondingly unbounded robustness parameters. We again demonstrate that such graphs (of linear degree) exist (in abundance), and that they can be constructed efficiently, in a strong sense. This turns out to require very different tools. Specifically, we show that the construction of such graphs reduces to the construction of non-malleable two-source extractors (with very weak parameters but with some additional natural features). We demonstrate that robustly self-ordered bounded-degree graphs are useful towards obtaining lower bounds on the query complexity of testing graph properties both in the bounded-degree and the dense graph models. One of the results that we obtain, via such a reduction, is a subexponential separation between the query complexities of testing and tolerant testing of graph properties in the bounded-degree graph model.
description: Slightly modified and revised version of a CCC 2021 paper that also appeared on ECCC 27: 149 (2020). TheoretiCS 1 (2022), Article 1, 92 pages
Death Anxiety among Hospitalized Patients: A Gender Based Comparison
Creators: name: Mr. Shahid, Ali
name: Dr. Saima, Ambreen
name: Dr. Sara Mehmood, Durrani
Publisher: name: Zenodo
Year: 2023
Subjects: Death Anxiety. Hospitalized Patients, Anxiety, Gender Based,Quetta and Makuran

description: JQSS is the research Journal of HRA (AL-HIDAYA RESEARCH ACADEMY (Rg)Balochistan Quetta, it is a bi-annual journal and offers double-blind peer review, started at 2021.
Spatiotemporal regulation of enhancers during cardiogenesis
Creators: name: Dupays, Laurent
name: Mohun, Timothy
Publisher: name: The Francis Crick Institute
Year: 2021
Subjects: Developmental Biology
Imaging
Model organisms

description: With the advance in chromatin immunoprecipitation followed by high-throughput sequencing, there has been a dramatic increase in our understanding of distal enhancer function. In the developing heart, the identification and characterisation of such enhancers have deepened our knowledge of the mechanisms of transcriptional regulation that drives cardiac differentiation. With next-generation sequencing techniques becoming widely accessible, the quantity of data describing the genome-wide distribution of cardiac-specific transcription factor and chromatin modifiers has rapidly increased and it is now becoming clear that the usage of enhancers is highly dynamic and complex, both during the development and in the adult. The identification of those enhancers has revealed new insights into the transcriptional mechanisms of how tissue-specific gene expression patterns are established, maintained, and change dynamically during development and upon physiological stress.
Superconducting Transition Temperatures for Spin-Fluctuation Promoted Superconductivity in Heavy Fermion Compounds
Creators: name: Nishiyama, Shinya
name: Miyake, K.
name: Varma, C. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The quantum critical Antiferromagnetic (AFM) fluctuation spectra measured by inelastic neutron scattering recently in two heavy fermion superconductors are used together with their other measured properties to calculate their D-wave superconducting transition temperatures $T_{\rm c}$. To this end, the linearized Eliashberg equations for D-wave superconductivity induced by AFM fluctuations are solved in models of fermions with various levels of nesting. The results for the ratio of $T_{\rm c}$ to the characteristic spin-fluctuation energy are well parametrized by a dimensionless coupling constant and the AFM correlation length. Comparing the results with experiments suggests that one may reasonably conclude that superconductivity in these compounds is indeed caused by AFM fluctuations. This conclusion is strengthened by a calculation with the same parameters of the measured coefficient of the normal state quantum-critical resistivity $\propto T^{3/2}$ characteristic of {\it gaussian} AFM quantum-critical fluctuations. The calculations give details of the superconducting coupling as a function of the correlation length and the integrated fluctuation spectra useful in other compounds.
Non-exponential spontaneous emission dynamics for emitters in a time-dependent optical cavity
Creators: name: Thyrrestrup, Henri
name: Hartsuiker, Alex
name: Gérard, Jean-Michel
name: Vos, Willem L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We have theoretically studied the effect of deterministic temporal control of spontaneous emission in a dynamic optical microcavity. We propose a new paradigm in light emission: we envision an ensemble of two-level emitters in an environment where the local density of optical states is modified on a time scale shorter than the decay time. A rate equation model is developed for the excited state population of two-level emitters in a time-dependent environment in the weak coupling regime in quantum electrodynamics. As a realistic experimental system, we consider emitters in a semiconductor microcavity that is switched by free-carrier excitation. We demonstrate that a short temporal increase of the radiative decay rate depletes the excited state and drastically increases the emission intensity during the switch time. The resulting time-dependent spontaneous emission shows a distribution of photon arrival times that strongly deviates from the usual exponential decay: A deterministic burst of photons is spontaneously emitted during the switch event.
description: 12 pages, 4 figures
title: Serviço social e envelhecimento ativo : teorias, práticas e dilemas profissionais
Creators: name: Carvalho, Maria Irene
Publisher: name: Universidade Lusíada Editora
Year: 2011

description: Intervenção social. - ISSN 0874-1611. - N. 38 (2.º semestre 2011). - p. 45-60.
Nonlinear realizations and the orbit method
Creators: name: Gonera, Joanna
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Given a symmetry group one can construct the invariant dynamics using the technique of nonlinear realizations or the orbit method. The relationship between these methods is discussed. Few examples are presented.
description: 20 pages, no figures; references added