cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Effects of bulk and interfacial anharmonicity on thermal conductance at solid/solid interfaces
Creators: name: Le, Nam Q.
name: Polanco, Carlos A.
name: Rastgarkafshgarkolaei, Rouzbeh
name: Zhang, Jingjie
name: Ghosh, Avik W.
name: Norris, Pamela M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present the results of classical molecular dynamics simulations to assess the relative contributions to interfacial thermal conductance from inelastic phonon processes at the interface and in the adjacent bulk materials. The simulated system is the prototypical interface between argon and "heavy argon" crystals, which enables comparison with many past computational studies. We run simulations interchanging the Lennard-Jones potential with its harmonic approximation to test the effect of anharmonicity on conductance. The results confirm that the presence of anharmonicity is correlated with increasing thermal conductance with temperature, which supports conclusions from prior experimental and theoretical work. However, in the model Ar/heavy-Ar system, anharmonic effects at the interface itself contribute a surprisingly small part of the total thermal conductance. The larger fraction of the thermal conductance at high temperatures arises from anharmonic effects away from the interface. These observations are supported by comparisons of the spectral energy density, which suggest that bulk anharmonic processes increase interfacial conductance by thermalizing energy from modes with low transmission to modes with high transmission.
On the non-Kolmogorov nature of flare-productive solar active regions
Creators: name: Mandage, Revati S.
name: McAteer, R. T. James
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A magnetic power spectral analysis is performed on 53 solar active regions, observed from August 2011 to July 2012. Magnetic field data obtained from the Helioseismic and Magnetic Imager, inverted as Active Region Patches, are used to study the evolution of the magnetic power index as each region rotates across the solar disk. Active regions are classified based on the number, and sizes, of solar flares they produce, in order to study the relationship between flare productivity and the magnetic power index. The choice of window size and inertial range plays a key role in determining the correct magnetic power index. The overall distribution of magnetic power indices has a range of $1.0-2.5$. Flare-quiet regions peak at a value of 1.6, however flare-productive regions peak at a value of 2.2. Overall, the histogram of the distribution of power indices of flare-productive active regions is well separated from flare-quiet active regions. Only 12\% of flare-quiet regions exhibit an index greater than 2, whereas 90\% of flare-productive regions exhibit an index greater than 2. Flare-quiet regions exhibit a high temporal variance (i.e, the index fluctuates between high and low values), whereas flare-productive regions maintain an index greater than 2 for several days. This shows the importance of including the temporal evolution of active regions in flare prediction studies, and highlights the potential of a 2-3 day prediction window for space weather applications.
description: accepted for publication in ApJ
MPEC 2023-N14 : DAILY ORBIT UPDATE (2023 July 5)
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Interplay of Organizational Culture, Job Satisfaction, Organizational Citizenship Behavior and Organizational Performance in the Ethiopian Public Sector
Creators: name: Gebretsadik, Simret
Publisher: name: African Journal of Leadership and Development
Year: 2022

description: The purpose of this study was to analyze the interplay among organizational culture, employees’ job satisfaction, organizational citizenship behavior and organizational performance in selected public organizations ranked as high, medium and low level performers. An explanatory research design with mixed methods approach was used. Data were collected via questionnaire, interview and document review. Structural equation modeling was done using AMOS. MANOVA was also conducted using the SPSS software. Likewise, the qualitative data were analyzed thematically. Findings of the analysis revealed that organizational culture has a positive and significant direct effect on employees’ job satisfaction and organizational citizenship behaviour. The effect of organizational culture on organizational citizenship behavior mediated by employees’ job satisfaction is also positive and statistically significant. Therefore, the researcher concluded that the theoretical assumptions about the interaction among organizational culture, employees’ job satisfaction and organizational citizenship behaviour are confirmed. Even though there is statistically significant difference in the studied organizations’ nature of organizational culture and levels of employees’ job satisfaction, there is no practical difference in the organizations’ practical reality. This finding leads to the conclusion that the studied organizations’ difference in their level of organizational performance was not caused by their differences in organizational culture, levels of employees’ job satisfaction and organizational citizenship beaviour, but by flaws in the performance measurement mechanisms.
description: African Journal of Leadership and Development, Vol. 7 No. 2 (2022): Job Satisfaction, Organizational Performance and Project Success
Compact star forming galaxies as the progenitors of compact quiescent galaxies: clustering result
Creators: name: Lin, Xiaozhi
name: Fan, Lulu
name: Kong, Xu
name: Fang, Guanwen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a measurement of the spatial clustering of massive compact galaxies at $1.2\le z \le 3$ in CANDELS/3D-HST fields. We obtain the correlation length for compact quiescent galaxies (cQGs) at $z\sim1.6$ of $r_{0}=7.1_{-2.6}^{+2.3}\ h^{-1}Mpc$ and compact star forming galaxies (cSFGs) at $z\sim2.5$ of $r_{0}=7.7_{-2.9}^{+2.7}\ h^{-1}Mpc$ assuming a power-law slope $γ=1.8$. The characteristic dark matter halo masses $M_H$ of cQGs at $z\sim1.6$ and cSFGs at $z\sim2.5$ are $\sim7.1\times 10^{12}\ h^{-1} M_\odot$ and $\sim4.4\times10^{12}\ h^{-1} M_\odot$, respectively. Our clustering result suggests that cQGs at $z\sim1.6$ are possibly the progenitors of local luminous ETGs and the descendants of cSFGs and SMGs at $z>2$. Thus an evolutionary connection involving SMGs, cSFGs, QSOs, cQGs and local luminous ETGs has been indicated by our clustering result.
description: 20 pages, 5 figures
Empirical parametrizations of the resonance amplitudes based on the Siegert's theorem
Creators: name: Ramalho, G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present parametrizations of the $γ^\ast N \to N(1535)1/2^-$, $γ^\ast N \to N(1520)3/2^-$ and $γ^\ast N \to Δ(1232)3/2^+$ transition amplitudes that are compatible with the analytic constraints at the pseudothreshold (Siegert's theorem). The presented parametrizations also provide a fair description of the experimental data. For the case of the $γ^\ast N \to Δ(1232)3/2^+$ transition, we discuss how the pion cloud parametrizations of the electric and the Coulomb quadrupole form factors can be adjusted according to the Siegert's theorem.
description: Proceedings of the "The 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon". July 25-30, 2016, Kyoto, Japan. 5 pages, 4 figures
Architecture and Function of Mechanosensitive Membrane Protein Lattices
Creators: name: Kahraman, Osman
name: Koch, Peter D.
name: Klug, William S.
name: Haselwandter, Christoph A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Biomolecules (q-bio.BM)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Experiments have revealed that membrane proteins can form two-dimensional clusters with regular translational and orientational protein arrangements, which may allow cells to modulate protein function. However, the physical mechanisms yielding supramolecular organization and collective function of membrane proteins remain largely unknown. Here we show that bilayer-mediated elastic interactions between membrane proteins can yield regular and distinctive lattice architectures of protein clusters, and may provide a link between lattice architecture and lattice function. Using the mechanosensitive channel of large conductance (MscL) as a model system, we obtain relations between the shape of MscL and the supramolecular architecture of MscL lattices. We predict that the tetrameric and pentameric MscL symmetries observed in previous structural studies yield distinct lattice architectures of MscL clusters and that, in turn, these distinct MscL lattice architectures yield distinct lattice activation barriers. Our results suggest general physical mechanisms linking protein symmetry, the lattice architecture of membrane protein clusters, and the collective function of membrane protein lattices.
Finding binary active galactic nuclei candidates by the centroid shift in imaging surveys II. Testing the method with SDSS J233635.75-010733.7
Creators: name: Liu, Yuan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In Liu (2015), we propose selecting binary active galactic nuclei (AGNs) candidates using the centroid shift of the images, which is induced by the non-synchronous variations of the two nuclei. In this paper, a known binary AGN (SDSS J233635.75-010733.7) is employed to verify the ability of this method. Using 162 exposures in the $R$ band of \textit{Palomar Transient Factory} (PTF), an excess of dispersion in the positional distribution of the binary AGN is detected, though the two nuclei cannot be resolved in the images of PTF. We also propose a new method to compare the position of the binary AGN in PTF $g$ and $R$ band and find the difference is highly significant even only with 20 exposures. This new method is efficient for two nuclei with different spectral energy distributions, e.g., type I + type II AGN or off-set AGN. Large-scale surveys, e.g., the Panoramic Survey Telescope and Rapid Response System and the Large Synoptic Survey Telescope, are expected to discover a large sample of binary AGN candidates with these methods.
description: 5 pages, 5 figures, accepted by A&A
Market Analysis Brazil: BUS 28
Creators: name: Market Analysis
Publisher: name: Roper Center for Public Opinion Research
Year: 2023

description: Ownership of household appliances/luxuries (1); social class (1); main problem facing Brazil (1); globalization (1); protectionism (1); rich individuals deserve their wealth (1); involvement of NGOs (1); trust in leaders (2); factors that influence opinions on large corporations (1); respect for differing companies/institutions (2); priorities of differing industries (6); 2008 American Presidential election (3); Al-Qaeda (3); economic impacts on self or family (4); energy concerns (3); pollution (1); fossil fuels/climate change (4); energy consumption/habits (3); personal values/characteristics (1).
Simplification of the Flux Function for a Higher-order Gas-kinetic Evolution Model
Creators: name: Zhou, Guangzhao
name: Xu, Kun
name: Liu, Feng
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The higher-order gas-kinetic scheme for solving the Navier-Stokes equations has been studied in recent years. In addition to the use of higher-order reconstruction techniques, many terms are used in the Taylor expansion of the gas distribution functions. Therefore, a large number of coefficients need to be determined in the calculation of the time evolution of the gas distribution function at cell interfaces. As a consequence, the higher-order flux function takes much more computational time than that of a second-order gas-kinetic scheme. This paper aims to simplify the evolution model by two steps. Firstly, the coefficients related to the higher-order spatial and temporal derivatives of a distribution function are redefined to reduce the computational cost. Secondly, based on the physical analysis, some terms can be removed without loss of accuracy. Through the simplifications, the computational efficiency of the higher-order scheme is increased significantly. In addition, a self-adaptive numerical viscosity is designed to minimize the necessary numerical dissipation. Several numerical examples are tested to demonstrate the accuracy and robustness of the current scheme.
Recovering an electromagnetic obstacle by a few phaseless backscattering measurements
Creators: name: Li, Jingzhi
name: Liu, Hongyu
name: Wang, Yuliang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider the electromagnetic scattering from a convex polyhedral PEC or PMC obstacle due to a time-harmonic incident plane wave. It is shown that the modulus of the far-field pattern in the backscattering aperture possesses a certain local maximum behavior. Using the local maximum indicating phenomena, one can determine the exterior unit normal directions, as well as the face areas, of the front faces of the obstacle. Then we propose a recovery scheme of reconstructing the obstacle by phaseless backscattering measurements. This work significantly extends our recent study in [12] from two dimensions and acoustic scattering to the much more challenging three dimensions and electromagnetic scattering.
Photoproduction of $J/ψ$ and $Υ$ states in exclusive and proton-dissociative diffractive events
Creators: name: Schäfer, Wolfgang
name: Szczurek, Antoni
name: Cisek, Anna
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The amplitude for $γp \to V p$, where $V$ is a $J/ψ$ or $Υ$ ground state or excited vector meson, is calculated in a pQCD $k_{T}$-factorization approach. We use this amplitude to predict the cross section for exclusive photoproduction of $J/ψ, ψ', Υ$ mesons in proton-proton collisions. Calculations are performed for a variety of unintegrated gluon distributions, and we compare our results to LHCb data. Here we especially focus on the possibilty of constraining saturation effects. Compared to earlier calculations we include both Dirac and Pauli electromagnetic form factors. We discuss the role of the $Q\bar Q$ light-cone wave functions for differential distributions for ratios such as $σ(ψ')/σ(J/ψ)$. Absorption effects are always taken into account. We also discuss the related diffractive production in proton dissociative events. Here we concentrate on electromagnetic dissociation , which is calculable without additional free parameters. Besides being of interest in their own right, dissociative events constitute an important experimental background to exclusive production.
description: 6 pages, 5 figures, Talk given by WS at the XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects, 11-15 April, 2016, DESY Hamburg, Germany
Flaring Rates and the Evolution of Sunspot Group McIntosh Classifications
Creators: name: McCloskey, Aoife E.
name: Gallagher, Peter T.
name: Bloomfield, D. Shaun
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Sunspot groups are the main source of solar flares, with the energy to power them being supplied by magnetic-field evolution (e.g. flux emergence or twisting/shearing). To date, few studies have investigated the statistical relation between sunspot-group evolution and flaring, with none considering evolution in the McIntosh classification scheme. Here we present a statistical analysis of sunspot groups from Solar Cycle 22, focusing on 24-hour changes in the three McIntosh classification components. Evolution-dependent >C1.0, >M1.0, and >X1.0 flaring rates are calculated, leading to the following results: (i) flaring rates become increasingly higher for greater degrees of upward evolution through the McIntosh classes, with the opposite found for downward evolution; (ii) the highest flaring rates are found for upward evolution from larger, more complex, classes (e.g. Zurich D- and E-classes evolving upward to F-class produce >C1.0 rates of 2.66 +/- 0.28 and 2.31 +/- 0.09 flares per 24 hours, respectively); (iii) increasingly complex classes give higher rates for all flare magnitudes, even when sunspot groups do not evolve over 24 hours. These results support the hypothesis that injection of magnetic energy by flux emergence (i.e. increasing in Zurich or compactness classes) leads to a higher frequency and magnitude of flaring.
description: 31 pages, 11 figures
A Bayesian Analysis of the Ages of Four Open Clusters
Creators: name: Jeffery, Elizabeth J.
name: von Hippel, Ted
name: van Dyk, David A.
name: Stenning, David C.
name: Robinson, Elliot
name: Stein, Nathan
name: Jefferys, W. H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In this paper we apply a Bayesian technique to determine the best fit of stellar evolution models to find the main sequence turn off age and other cluster parameters of four intermediate-age open clusters: NGC 2360, NGC 2477, NGC 2660, and NGC 3960. Our algorithm utilizes a Markov chain Monte Carlo technique to fit these various parameters, objectively finding the best-fit isochrone for each cluster. The result is a high-precision isochrone fit. We compare these results with the those of traditional "by-eye" isochrone fitting methods. By applying this Bayesian technique to NGC 2360, NGC 2477, NGC 2660, and NGC 3960, we determine the ages of these clusters to be 1.35 +/- 0.05, 1.02 +/- 0.02, 1.64 +/- 0.04, and 0.860 +/- 0.04 Gyr, respectively. The results of this paper continue our effort to determine cluster ages to higher precision than that offered by these traditional methods of isochrone fitting.
description: 13 pages, 8 figures, published in ApJ
Observing Custom Software Modifications: A Quantitative Approach of Tracking the Evolution of Patch Stacks
Creators: name: Ramsauer, Ralf
name: Lohmann, Daniel
name: Mauerer, Wolfgang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Modifications to open-source software (OSS) are often provided in the form of "patch stacks" - sets of changes (patches) that modify a given body of source code. Maintaining patch stacks over extended periods of time is problematic when the underlying base project changes frequently. This necessitates a continuous and engineering-intensive adaptation of the stack. Nonetheless, long-term maintenance is an important problem for changes that are not integrated into projects, for instance when they are controversial or only of value to a limited group of users. We present and implement a methodology to systematically examine the temporal evolution of patch stacks, track non-functional properties like integrability and maintainability, and estimate the eventual economic and engineering effort required to successfully develop and maintain patch stacks. Our results provide a basis for quantitative research on patch stacks, including statistical analyses and other methods that lead to actionable advice on the construction and long-term maintenance of custom extensions to OSS.
The Australian Square Kilometre Array Pathfinder: Performance of the Boolardy Engineering Test Array
Creators: name: McConnell, D.
name: Allison, J. R.
name: Bannister, K.
name: Bell, M. E.
name: Bignall, H. E.
name: Chippendale, A. P.
name: Edwards, P. G.
name: Harvey-Smith, L.
name: Hegarty, S.
name: Heywood, I.
name: Hotan, A. W.
name: Indermuehle, B. T.
name: Lenc, E.
name: Marvil, J.
name: Popping, A.
name: Raja, W.
name: Reynolds, J. E.
name: Sault, R. J.
name: Serra, P.
name: Voronkov, M. A.
name: Whiting, M.
name: Amy, S. W.
name: Axtens, P.
name: Ball, L.
name: Bateman, T. J.
name: Bock, D. C. -J.
name: Bolton, R.
name: Brodrick, D.
name: Brothers, M.
name: Brown, A. J.
name: Bunton, J. D.
name: Cheng, W.
name: Cornwell, T.
name: DeBoer, D.
name: Feain, I.
name: Gough, R.
name: Gupta, N.
name: Guzman, J. C.
name: Hampson, G. A.
name: Hay, S.
name: Hayman, D. B.
name: Hoyle, S.
name: Humphreys, B.
name: Jacka, C.
name: Jackson, C. A.
name: Jackson, S.
name: Jeganathan, K.
name: Joseph, J.
name: Koribalski, B. S.
name: Leach, M.
name: Lensson, E. S.
name: MacLeod, A.
name: Mackay, S.
name: Marquarding, M.
name: McClure-Griffiths, N. M.
name: Mirtschin, P.
name: Mitchell, D.
name: Neuhold, S.
name: Ng, A.
name: Norris, R.
name: Pearce, S.
name: Qiao, R. Y.
name: Schinckel, A. E. T.
name: Shields, M.
name: Shimwell, T. W.
name: Storey, M.
name: Troup, E.
name: Turner, B.
name: Tuthill, J.
name: Tzioumis, A.
name: Wark, R. M.
name: Westmeier, T.
name: Wilson, C.
name: Wilson, T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We describe the performance of the Boolardy Engineering Test Array (BETA), the prototype for the Australian Square Kilometre Array Pathfinder telescope ASKAP. BETA is the first aperture synthesis radio telescope to use phased array feed technology, giving it the ability to electronically form up to nine dual-polarization beams. We report the methods developed for forming and measuring the beams, and the adaptations that have been made to the traditional calibration and imaging procedures in order to allow BETA to function as a multi-beam aperture synthesis telescope. We describe the commissioning of the instrument and present details of BETA's performance: sensitivity, beam characteristics, polarimetric properties and image quality. We summarise the astronomical science that it has produced and draw lessons from operating BETA that will be relevant to the commissioning and operation of the final ASKAP telescope.
description: Accepted for publication in PASA
The effect of monitoring and evaluation practices on the success of development projects of non-governmental organizations
Creators: name: Workneh, AEndris Yesuf
name: Aga, Deribe Assefa
Publisher: name: African Journal of Leadership and Development
Year: 2022

description: Though project management literature documents that monitoring and evaluation (M&E) is of paramount importance in explaining the project success, there are few empirical studies that address the unique contribution of M&E in project success. The purpose of this study is, therefore, to investigate the effect of M&E practices on project success. The study mainly employs survey research design comprising explanatory research types. Using 92 development projects of the Non-Governmental Organization (NGO) sector in Ethiopia, the findings from multiple linear regression indicate that project M&E practices in terms of planning, staff technical skill, budgeting and stakeholders’ engagement have positive and significant effects on project success. Thus, the findings of this study imply that project-oriented organizations including NGOs need to establish robust project M&E system in order to enhance the project success.
description: African Journal of Leadership and Development, Vol. 7 No. 2 (2022): Job Satisfaction, Organizational Performance and Project Success
Suppl. material to JIFF-2023.0008 - Standardising black soldier fly larvae feeding experiments: an initial protocol and variability estimates
Creators: name: Deruytter, D.
name: Gasco, L.
name: Yakti, W.
name: Katz, H.
name: Coudron, C.L.
name: Gligorescu, A.
name: Frooninckx, L.
name: Noyens, I.
name: Meneguz, M.
name: Grosso, F.
name: Bellezza Oddon, S.
name: Biasato, I.
name: Mielenz, M.
name: Veldkamp,, T.
name: Van Loon, J.J.A.
name: Spranghers, T.
name: Vandenberg, G.W.
name: Oonincx, D.G.A.B.
name: Bosch, G.
Publisher: name: Brill Online
Year: 2023
Subjects: classificationCode: 300699
subject: Food sciences not elsewhere classified

description: There is a growing interest in the ability of black soldier fly (Hermetia illucens) larvae (BSFL) to convert low-value organic residues into high-value products. This leads to more publications with conversion data for various organic resources. However, these results are rarely comparable between laboratories due to differences in study protocols. This hinders comparisons among studies, the use of results in practice, and overall advancement in BSFL conversion research. Therefore, a standardised research protocol was developed for nursing, rearing and harvesting of BSFL for feed assessment. The utility of this protocol, was assessed via an international ring test with 9 partners. One batch of Gainesville diet (wheat bran (50%), alfa-alfa (30%) and maize (20%)) was produced and distributed among the partners to avoid dietary variations. Five-day-old BSFL larvae were used for the growth trial with six replicates per partner. Average larval weight was assessed after 3 days, 7 days, and harvest (> 10% prepupae). Total yield and frass were recorded, and samples were chemically analysed to allow the quantification of the conversion efficiency. The results were used to calculate the within and between partner variability of the protocol. The results indicate that for the biological parameters (average weight, yield and density) the within partner variability was 24% and the between partner variability was 60%. For the assessed chemical parameters (N, fat, ash, P, K, pH), both the within and between variability was lower (respectively 9 and 28%). The results of this study give a first indication of the variability that can be expected within and between BSFL feeding experiments for different parameters and can therefore serve as guideline when developing a new experimental designs, assess standard operating procedures and other applications. The protocol can be used as first basis for future feed experiments, improving the comparability of results.
Segmentation of Coronal Holes Using Active Contours Without Edges
Creators: name: Boucheron, L. E.
name: Valluri, M.
name: McAteer, R. T. J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: An application of active contours without edges is presented as an efficient and effective means of extracting and characterizing coronal holes. Coronal holes are regions of low-density plasma on the Sun with open magnetic field lines. As the source of the fast solar wind, the detection and characterization of these regions is important for both testing theories of their formation and evolution and from a space weather perspective. Coronal holes are detected in full disk extreme ultraviolet (EUV) images of the corona obtained with the Solar Dynamics Observatory Atmospheric Imaging Assembly (SDO/AIA). The proposed method detects coronal boundaries without determining any fixed intensity value in the data. Instead, the active contour segmentation employs an energy-minimization in which coronal holes are assumed to have more homogeneous intensities than surrounding active regions and quiet Sun. The segmented coronal holes tend to correspond to unipolar magnetic regions, are consistent with concurrent solar wind observations, and qualitatively match the coronal holes segmented by other methods. The means to identify a coronal hole without specification of a final intensity threshold may allow this algorithm to be more robust across multiple datasets, regardless of data type, resolution, and quality.
Monoids over which products of indecomposable acts are indecomposable
Creators: name: Sedaghatjoo, Mojtaba
name: Khaksari, Ahmad
Publisher: name: arXiv
Year: 2016
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 20M30-20M50

description: In this paper we prove that for a monoid $S$, products of indecomposable right $S$-acts are indecomposable if and only if $S$ contains a right zero. Besides, we prove that subacts of indecomposable right $S$-acts are indecomposable if and only if $S$ is left reversible. Ultimately, we prove that the one element right $S$-act $Θ_S$ is product flat if and only if $S$ contains a left zero.
description: 10 pages
Bilayer-thickness-mediated interactions between integral membrane proteins
Creators: name: Kahraman, Osman
name: Koch, Peter D.
name: Klug, William S.
name: Haselwandter, Christoph A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Biomolecules (q-bio.BM)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Hydrophobic thickness mismatch between integral membrane proteins and the surrounding lipid bilayer can produce lipid bilayer thickness deformations. Experiment and theory have shown that protein-induced lipid bilayer thickness deformations can yield energetically favorable bilayer-mediated interactions between integral membrane proteins, and large-scale organization of integral membrane proteins into protein clusters in cell membranes. Within the continuum elasticity theory of membranes, the energy cost of protein-induced bilayer thickness deformations can be captured by considering compression and expansion of the bilayer hydrophobic core, membrane tension, and bilayer bending, resulting in biharmonic equilibrium equations describing the shape of lipid bilayers for a given set of bilayer-protein boundary conditions. Here we develop a combined analytic and numerical methodology for the solution of the equilibrium elastic equations associated with protein-induced lipid bilayer deformations. Our methodology allows accurate prediction of thickness-mediated protein interactions for arbitrary protein symmetries at arbitrary protein separations and relative orientations. We provide exact analytic solutions for cylindrical integral membrane proteins with constant and varying hydrophobic thickness, and develop perturbative analytic solutions for non-cylindrical protein shapes. We complement these analytic solutions, and assess their accuracy, by developing both finite element and finite difference numerical solution schemes. Taken together, the work presented here puts into place an analytic and numerical framework which allows calculation of bilayer-mediated elastic interactions between integral membrane proteins for the complicated protein shapes suggested by structural biology and at the small protein separations most relevant for the crowded membrane environments provided by living cells.
Effective Capacity of Receive Antenna Selection MIMO-OSTBC Systems in Co-Channel Interference
Creators: name: Lari, Mohammad
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, delay constrained performance of a multiple-input multiple-output (MIMO) communication system in a dense environment with co-channel interference is investigated. We apply orthogonal space-time block coding (OSTBC) at the transmitter, and for alleviating the high complexity and cost of the MIMO system, receive antenna selection (RAS) scheme is employed in the downlink. Here, for simple and cheap mobile handsets, one antenna is chosen at the receiver in each utilization of the channel. Under these assumptions, a maximum constant arrival rate with the delay quality-of-service (QoS) guarantee in a wireless channel is extracted. We obtain a closed-form solution for the effective capacity of the MIMO-OSTBC channel with the RAS scheme in a quasi-static Rayleigh fading conditions and co-channel interference. After all, the numerical simulations are provided and verified the theoretical results.
Spin excitations in optimally P-doped BaFe2(As0.7P0.3)2superconductor
Creators: name: Hu, Ding
name: Yin, Zhiping
name: Zhang, Wenliang
name: Ewings, R. A.
name: Ikeuchi, Kazuhiko
name: Nakamura, Mitsutaka
name: Roessli, Bertrand
name: Wei, Yuan
name: Zhao, Lingxiao
name: Chen, Genfu
name: Li, Shiliang
name: Luo, Huiqian
name: Haule, Kristjan
name: Kotliar, Gabriel
name: Dai, Pengcheng
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: We use inelastic neutron scattering to study temperature and energy dependence of spin excitations in optimally P-doped BaFe2(As0.7P0.3)2 superconductor (Tc = 30 K) throughout the Brillouin zone. In the undoped state, spin waves and paramagnetic spin excitations of BaFe2As2 stem from antiferromagnetic (AF) ordering wave vector QAF= (1/-1,0) and peaks near zone boundary at (1/-1,1/-1) around 180 meV. Replacing 30% As by smaller P to induce superconductivity, low-energy spin excitations of BaFe2(As0.7P0.3)2form a resonance in the superconducting state and high-energy spin excitations now peaks around 220 meV near (1/-1,1/-1). These results are consistent with calculations from a combined density functional theory and dynamical mean field theory, and suggest that the decreased average pnictogen height in BaFe2(As0.7P0.3)2 reduces the strength of electron correlations and increases the effective bandwidth of magnetic excitations.
description: 7 pages, 5 figures, with supplementary
Thin layered drawing media probed by THz time-domain spectroscopy
Creators: name: Tasseva, J.
name: Taschin, A.
name: Bartolini, P.
name: Striova, J.
name: Fontana, R.
name: Torre, R.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Dry and wet drawing materials were investigated by THz time-domain spectroscopy in transmission mode. Carbon-based and iron-gall inks have been studied, some prepared following ancient recipes and others using current synthetic materials; a commercial ink was studied as well. We measured the THz signals on thin film of liquid inks deposited on polyethylene pellicles, comparing the results with the thick pellets of dried inks blended with polyethylene powder. This study required the implementation of a new experimental method and data analysis procedure able to provide a reliable extraction of the material transmission parameters from a structured sample composed of thin layers, down to thickness of few tens of micrometers. THz measurements on thin ink layers enabled the determination of both the absorption and the refractive index in an absolute scale in the 0.1 - 3 THz range, as well as the layer thickness. THz spectroscopic features of a paper sheet dyed by one of the iron-gall inks were also investigated. Our results showed that THz time-domain spectroscopy enables to discriminate the various inks on different supports, including the application on paper, together with a proper determination of the absorption coefficients and indices of refraction.
From chiral d-wave to nodal line superconductivity in the harmonic honeycomb lattices
Creators: name: Schmidt, Johann
name: Bouhon, Adrien
name: Black-Schaffer, Annica
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: Motivated by the recent realization of the three-dimensional hyperhoneycomb and stripyhoneycomb lattices in lithium iridate (Li$_2$IrO$_3$), we study the possible spin-singlet superconducting states on the whole series of harmonic honeycomb lattices. Beginning with an isolated out-of-plane twist making the honeycomb lattice three-dimensional, we find that the chiral d$\pm$id state, well-known from the honeycomb lattice, is realized in the largest members of the series at low to intermediate doping. Along the twist, four chiral edge states form a two-dimensional dispersive band. Reducing the distance between the twists to form the smaller members of the harmonic honeycomb lattices, the degeneracy between the d-wave states is lifted, which finally destroys the chiral state. By analyzing the hyper- and stripyhoneycomb lattices and generalizing using the $D_{2h}$ point group of all the harmonic honeycomb lattices, we show that the superconducting state often belongs to the trivial irreducible representation. This state has nodal lines at low to intermediate doping, which is possible because the full lattice symmetry allows sign changes between different sets of bonds. We also find time-reversal symmetry broken states, which are either fully gapped or feature nodal points, in certain parts of the phase diagram. Finally, we draw a comparison between the states classified in terms of the $D_{2h}$ symmetries and those observed on the $D_{6h}$ honeycomb lattice.
Strategic Priorities Cascading and Contextualizing Practices at Different Tiers of Oromia Regional State: Context and Consistency Analysis
Creators: name: Olani, Dereje
Publisher: name: African Journal of Leadership and Development
Year: 2022

description: Nowadays, organizations face a fast changing and threatening environment that comes from demand for new policies, national and global economic forces, demographic, socio-cultural, and technological changes. These giant forces inevitably require organizations to be serious in thinking about their orientation, decisions, and actions. The objective of the current study was to examine the practice of strategic priority cascading focusing on context and consistency analysis. Specifically, context sensitivity, consistency of cascading practice, participation of stakeholders, capacity of planners, and factors affecting the practice of strategic priority cascading in the different tiers. Descriptive research design and mixed research approach were used. The population of the study was the selected public sectors ranging from Oromia Regional State to the Wereda level including Kebele. Both probabilistic and purposive sampling techniques were used based on the nature of the data and relevancy of the information. Questionnaires, interviews, focus group discussion and document analysis were used to collect data. The finding of the study shows that there was moderate level of context sensitivity of the strategic priority cascading and poor level of consistency. In addition, the result of the study shows that the relevant stakeholders’ participation was inadequate demanding improvement such as stablishing strong framework that maintains active participation. Furthermore, capacity building practice pertaining to the strategic priority cascading was low demanding any concerning body. The finding also indicates that a range of factors and challenges could affect the strategic priority cascading in the different tiers of the government. It was concluded that the strategic priority cascading practice in the different tiers was not adequately context sensitive and less consistent with the specific and unique characteristics of the study area. Recommendations were given based on the critical issues perceived in the result.
description: African Journal of Leadership and Development, Vol. 7 No. 2 (2022): Job Satisfaction, Organizational Performance and Project Success
Simulated annealing for three-dimensional low-beta reduced MHD equilibria in cylindrical geometry
Creators: name: Furukawa, M.
name: Morrison, P. J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Simulated annealing (SA) is applied for three-dimensional (3D) equilibrium calculation of ideal, low-beta reduced MHD in cylindrical geometry. The SA is based on the theory of Hamiltonian mechanics. The dynamical equation of the original system, low-beta reduced MHD in this study, is modified so that the energy changes monotonically while preserving the Casimir invariants in the artificial dynamics. An equilibrium of the system is given by an extremum of the energy, therefore SA can be used as a method for calculating ideal MHD equilibrium. Previous studies demonstrated that the SA succeeds to lead to various MHD equilibria in two dimensional rectangular domain. In this paper, the theory is applied to 3D equilibrium of ideal, low-beta reduced MHD. An example of equilibrium with magnetic islands, obtained as a lower energy state, is shown. Several versions of the artificial dynamics are developed that can effect smoothing.
description: Submitted to Plasma Physics and Controlled Fusion
Collaborative Design of Pathways to Sustainability. Guidebook for designing and running in-person workshops
Creators: name: Campo, Paolo
name: Willaarts, Barbara
name: Magnuszewski, Piotr
name: Giger, Timothy
name: Ksiazczak, Anna Maria
name: Brychczynski, Hubert
name: Kułakowska, Michalina
Publisher: name: Zenodo
Year: 2023
Subjects: stakeholder, co-creation, scenario building, SDGs, participatory methods

description: The guidebook is meant as a practical introduction and step-by-step instruction on how to design and apply the Collaborative Systems Mapping of Sustainable Pathways (CoSMoS) method. The process has been developed to bridge the gap between science, policy, and society. Scientific knowledge about sustainability challenges was used to develop multiple global scenarios.
 However, stakeholder engagement in scenario planning is often misunderstood as a way to give expert input to scientists and provide feedback on research results. If scenario efforts are to be useful for policy development, they need to clearly indicate the sphere of control where stakeholders representing specific decision unit(s) can develop robust strategies. The CoSMoS process allows them to develop strategic insights by building on selected representations of real-world structures and processes. The guidebook provides a necessary basis to understand the process so that readers can use it, adapt it to specific circumstances, and successfully execute it. The guide is an updated version of the ISWEL guidebook on Policy Simulations and is designed as a manual for organisations interested in using Collaborative Systems Mapping of Sustainable Pathways for face-to-face workshops. This includes organisations directly or indirectly involved in the process of policy development, especially in the context of various crises, such as climate emergency, biodiversity loss, rise in populism, and many others. The methodology strongly emphasises the positive, active, and inclusive approaches to co-creating sustainability pathways to desired futures. The guidebook will:
 1. explain the assumptions underlying the co-creation of scenarios and pathways,
 2. compare and contrast them with other, similar tools, and
 3. instruct how to adapt, design, and run new CoSMoS workshop sessions.
GPU Based Detection of Topological Changes in Voronoi Diagrams
Creators: name: Bernaschi, Massimo
name: Lulli, Matteo
name: Sbragaglia, Mauro
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The Voronoi diagrams are an important tool having theoretical and practical applications in a large number of fields. We present a new procedure, implemented as a set of CUDA kernels, which detects, in a general and efficient way, topological changes in case of dynamic Voronoi diagrams whose generating points move in time. The solution that we provide has been originally developed to identify plastic events during simulations of soft-glassy materials based on a Lattice Boltzmann model with frustrated-short range attractive and mid/long-range repulsive-interactions. Along with the description of our approach, we present also some preliminary physics results.
description: 25 pages, 11 figures
Triplet pair amplitude in a trapped $s$-wave superfluid Fermi gas with broken spin rotation symmetry. II. Three dimensional continuum case
Creators: name: Inotani, Daisuke
name: Hanai, Ryo
name: Ohashi, Yoji
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We extend our recent work [Y. Endo et. al., Phys. Rev. 92, 023610 (2015)] for a parity-mixing effect in a model two-dimensional lattice fermions to a realistic three-dimensional ultracold Fermi gas. Including effects of broken local spatial inversion symmetry by a trap potential within the framework of the real-space Bogoliubov-de Gennes theory at $T=0$, we point out that an odd-parity $p$-wave Cooper-pair amplitude is expected to have already been realized in previous experiments on an (even-parity) $s$-wave superfluid Fermi gas with spin imbalance. This indicates that, when one suddenly changes the $s$-wave pairing interaction to an appropriate $p$-wave one by using a Feshbach technique in this case, a non-vanishing $p$-wave superfluid order parameter is immediately obtained, which is given by the product of the $p$-wave interaction and the $p$-wave pair amplitude that has already been induced in the spin-imbalanced $s$-wave superfluid Fermi gas. Thus, by definition, the system is in the $p$-wave superfluid state, at least just after this manipulation. Since the achievement of a $p$-wave superfluid state is one of the most exciting challenges in cold Fermi gas physics, our results may provide an alternative approach to this unconventional pairing state. In addition, since the parity-mixing effect cannot be explained as far as one deals with a trap potential in the local density approximation (LDA), it is considered as a crucial example which requires us to go beyond LDA.
description: 20 pages, 7 figures
Formation and properties of astrophysical carbonaceous dust
Creators: name: Mauney, Christopher
name: Lazzati, Davide
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The classical theory of grain nucleation suffers from both theoretical and predictive deficiencies. We strive to alleviate these deficiencies in our understanding of dust formation and growth by utilizing an atomistic model of nucleation. Carbon cluster geometries are determined with a set of global minimization algorithms. Using density functional theory, the binding energies of carbon clusters from $n=2$ to $n=99$ are then calculated. These energies are used to calculate the critical size and nucleation rate of carbon clusters. We find that the critical cluster size is largely determined by the changes in geometry of the clusters. Clusters with size $n=27$ and $n=8$, roughly corresponding to the transition from ring-to-fullerene geometry and chain-to-ring geometry respectively, are the critical sizes across the range of temperature and saturation where nucleation is significant. In contrast to the classical theory, nucleation is enhanced at low-temperatures, and suppressed at high temperatures. These results will be applied to a modified chemical evolution code using results from supernova simulations.
description: 13 pages, 7 figures. Proceedings of Cosmic Dust VIII conference in Tokyo, 2015