cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Prediction of Magnetoelectric behavior in Bi2MnTiO6
Creators: name: Patra, Lokanath
name: Ravindran, P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present results from ab initio calculations based on density functional theory for bismuth-based double perovskite Bi2MnTiO6. Using total energy calculation with stress and force minimization we have predicted the equilibrium crystal structure for Bi2MnTiO6 considering potential structures into the calculation. We have predicted that the ground state of Bi2MnTiO6 will be a noncentrosymmetric rhombohedral structure with space group R3c. Our spin polarized calculation for different possible collinear magnetic configurations we found that Bi2MnTiO6 will be an insulator with G-type antiferromagnetic ordering in its ground state. The coexistence of both stereochemically active Bi-6s lone pair and the Ti4+ with d0-ness which bring covalency results in the stabilization of noncentrosymmetric structure and thus ferroelectricity. Our orbital projected density of states plot shows that the Mn2+ in Bi2MnTiO6 will be at high spin state with a spin moment of 4.28 μB. Hence Bi2MnTiO6 is predicted to be a magnetoelectric material.
description: 3 pages, submitted to proceedings for the "61st DAE Solid State Physics Symposium" Bhubaneswar, Odisha, India
Laboratory Measurements of the K-shell transition energies in L-shell ions of Si and S
Creators: name: Hell, N.
name: Brown, G. V.
name: Wilms, J.
name: Grinberg, V.
name: Clementson, J.
name: Liedahl, D.
name: Porter, F. S.
name: Kelley, R. L.
name: Kilbourne, C. A.
name: Beiersdorfer, P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We have measured the energies of the strongest 1s-2ell (ell=s,p) transitions in He- through Ne-like silicon and sulfur ions to an accuracy of better than 1eV using Lawrence Livermore National Laboratory's electron beam ion traps, EBIT-I and SuperEBIT, and the NASA/GSFC EBIT Calorimeter Spectrometer (ECS). We identify and measure the energies of 18 and 21 X-ray features from silicon and sulfur, respectively. The results are compared to new Flexible Atomic Code calculations and to semi-relativistic Hartree Fock calculations by Palmeri et al. (2008). These results will be especially useful for wind diagnostics in high mass X-ray binaries, such as Vela X-1 and Cygnus X-1, where high-resolution spectral measurements using Chandra's high energy transmission grating has made it possible to measure Doppler shifts of 100km/s. The accuracy of our measurements is consistent with that needed to analyze Chandra observations, exceeding Chandra's 100km/s limit. Hence, the results presented here not only provide benchmarks for theory, but also accurate rest energies that can be used to determine the bulk motion of material in astrophysical sources. We show the usefulness of our results by applying them to redetermine Doppler shifts from Chandra observations of Vela X-1.
description: ApJ, in press
Should VAT be booked in the companies' income statements?
Creators: name: Romani, Christophe
Publisher: name: Zenodo
Year: 2022
Subjects: Financial Analysis
Accounting
Taxes
Income Statement

description: VAT is usually presented as an indirect tax on consumers, but it is just as fair to refer to it as a direct tax on companies’ margins, as already demonstrated in the economic literature. From this angle, VAT has an impact on the profitability of businesses: in the field of accounting, as a consequence, it becomes logical to recommend a VAT-included approach of the P&L.
Should VAT be booked in the companies' income statements?
Creators: name: Romani, Christophe
Publisher: name: Zenodo
Year: 2022
Subjects: Financial Analysis
Accounting
Taxes
Income Statement

description: VAT is usually being presented as an indirect tax on consumers, but it is just as fair to refer to it as a direct tax on companies’ margins, as already demonstrated in the economic literature. From this angle, VAT has an impact on the profitability of businesses: in the field of accounting, as a consequence, it becomes logical to recommend a VAT-included approach of the P&L.
title: Lower Piru Creek Road Crossing
titleType: AlternativeTitle
title: Endangered Species Act Section 7(a)(2) Biological Opinion for the Federal Energy Regulatory Commission's Approval of the Modified Land Resources Management Plan
Creators: name: United States. National Marine Fisheries Service. West Coast Region
Publisher: name: United States. National Marine Fisheries Service. West Coast Region
Year: 2017

description: WCRO-2016-00974
Plexus brachial et variantes anatomiques
Creators: name: Bengana, Bilal
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 320905
subject: Neurology and neuromuscular diseases
classificationCode: 320223
subject: Rheumatology and arthritis

description: Le plexus brachial est un réseau anastomotique, qui résulte de la réunion de branches ventrales des nerfs rachidiens (C5 – T1). Les racines nerveuses s’anastomosent pour former les trois troncs (supérieur, moyen et inférieur), ces derniers se divisent pour former les faisceaux (latéral, médial et postérieur). Le plexus brachial donne des branches sensitivomotrices assurant l’innervation des différents muscles et téguments de la ceinture scapulaire et du membre thoraco-appendiculaire. Ce réseau anastomotique sujet à de nombreuses variations anatomiques touchant les troncs, les faisceaux et les branches terminales et collatérales. Ces variétés anatomiques doivent être discutées devant un tableau d’incohérence anatomo-clinique et topographique lésionnelle.
Metastable Features of Economic Networks and Responses to Exogenous Shocks
Creators: name: Hosseiny, Ali
name: Bahrami, Mohammad
name: Palestrini, Antonio
name: Gallegati, Mauro
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: General Economics (econ.GN)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: It has been proved that network structure plays an important role in addressing a collective behaviour. In this paper we consider a network of firms and corporations and study its metastable features in an Ising based model. In our model, we observe that if in a recession the government imposes a demand shock to stimulate the network, metastable features shape its response. Actually we find that there is a minimum bound where demand shocks with a size below it are unable to trigger the market out from recession. We then investigate the impact of network characteristics on this minimum bound. We surprisingly observe that in a Watts-Strogatz network though the minimum bound depends on the average of the degrees, when translated into the economics language, such a bound is independent of the average degrees. This bound is about $0.44 Δ$GDP, where $Δ$GDP is the gap of GDP between recession and expansion. We examine our suggestions for the cases of the United States and the European Union in the recent recession, and compare them with the imposed stimulations. While stimulation in the US has been above our threshold, in the EU it has been far below our threshold. Beside providing a minimum bound for a successful stimulation, our study on the metastable features suggests that in the time of crisis there is a "golden time passage" in which the minimum bound for successful stimulation can be much lower. So, our study strongly suggests stimulations to be started within this time passage.
description: 13 pages, 10 figures, accepted for publication in PloS One
title: Revolution Wind (Ørsted; MA, RI)
titleType: AlternativeTitle
title: National Marine Fisheries Service Endangered Species Act Section 7 Consultation Biological Opinion Construction, Operation, Maintenance, and Decommissioning of the Revolution Wind Offshore Energy Project (Lease OCS-A 0486)
Creators: name: United States. National Marine Fisheries Service. Greater Atlantic Regional Fisheries Office
Publisher: name: United States. National Marine Fisheries Service. Greater Atlantic Regional Fisheries Office
Year: 2023

description: GARFO-2022-03532
Comments on "On q-non-extensive statistics with non-Tsallisian entropy"
Creators: name: Ilic, Velimir M.
name: Stankovic, Miomir S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Recently, in [P. Jizba and J. Korbel, Physica A 444, 2016, 808-827], four generalized Shannon-Khinchin [GSK] axioms have been proposed and a generalized entropy which uniquely satisfies the GSK axioms has been derived. In this comment, we show that the unique class of the entropies derived in the aforementioned paper is not correct, as it violates the fourth GSK axiom, and we derive the correct one. Nevertheless, the class of entropies proposed in the commented paper still can serve as a basis for generalized statistical mechanics. We propose a new axiomatic system which characterizes the class of entropies.
Should VAT be booked in the companies' income statements?
Creators: name: Romani, Christophe
Publisher: name: Zenodo
Year: 2023
Subjects: Financial Analysis
Accounting
Taxes
Income Statement - P&L report

description: VAT is usually being presented as an indirect tax on consumers, but it is just as fair to refer to it as a direct tax on companies’ margins, as already demonstrated in the economic literature. From this angle, VAT has an impact on the profitability of businesses: in the field of accounting, as a consequence, it becomes logical to recommend a VAT-included approach of the P&L.
A note on Catalan numbers associated with p-adic integral on Zp
Creators: name: Kim, Taekyun
Publisher: name: arXiv
Year: 2016
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11B68, 11S80

description: In this paper, we study Catalan numbers which can be represented by the p-adic integral on Zp and we investigate some properties and formulae related to Catalan numbers and special numbers.
description: 9
Overview of the Arctic SST/IST activities for the Copernicus Marine Service at DMI
Creators: name: Karagali, Ioanna
Publisher: name: Zenodo
Year: 2022

description: Short abstract  Accurate estimates of sea surface (SST) and sea-ice surface temperatures (IST) are crucial for understanding, monitoring and predicting climate change in the Arctic. The Danish Meteorological Institute releases a suite of Pan-Arctic L3 and L4 products in Near-Real-Time and as Multi-Year datasets, as a Production Unit (PU) for the Copernicus Marine Monitoring Service Sea Ice (SI) Thematic Assembly Center (TAC). Within this framework, the first gap-free (L4) combined SST and IST climate dataset of the Arctic (>58°N) for the period 1982-2021, has been released. Optimal interpolation was used to combine multiple infrared satellite observations to daily, gap-free fields with a spatial resolution of 0.05 degrees. The combination of SST and IST provides a consistent climate indicator which can be used to monitor day-to-day variations as well as climate trends in the Arctic Ocean; sea and sea-ice surface temperature increased about 4.5°C over the period 1982-2021, with the largest warming exceeding 10°C in the north-eastern Barents Sea. The aim of this presentation is to provide an overview of the existing suite of Copernicus Marine Service Pan-Arctic products for the SST and IST along with the improvements and new products planned for the new phase, including the new version of the L4 Multi-Year climate dataset and its associate Ocean Monitoring Indicators (OMI) which will be released by the end of 2022.
Probing Intergalactic Magnetic Fields with Simulations of Electromagnetic Cascades
Creators: name: Batista, Rafael Alves
name: Saveliev, Andrey
name: Sigl, Guenter
name: Vachaspati, Tanmay
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We determine the effect of intergalactic magnetic fields on the distribution of high energy gamma rays by performing three-dimensional Monte Carlo simulations of the development of gamma-ray-induced electromagnetic cascades in the magnetized intergalactic medium. We employ the so-called 'Large Sphere Observer' method to efficiently simulate blazar gamma ray halos. We study magnetic fields with a Batchelor spectrum and with maximal left- and right-handed helicities. We also consider the case of sources whose jets are tilted with respect to the line of sight. We verify the formation of extended gamma ray halos around the source direction, and observe spiral-like patterns if the magnetic field is helical. We apply the $Q$-statistics to the simulated halos to extract their spiral nature and also propose an alternative method, the $S$-statistics. Both methods provide a quantative way to infer the helicity of the intervening magnetic fields from the morphology of individual blazar halos for magnetic field strengths $B \gtrsim 10^{-15}\,{\rm G}$ and magnetic coherence lengths $L_{\rm c} \gtrsim 100\,{\rm Mpc}$. We show that the $S$-statistics has a better performance than the $Q$-statistics when assessing magnetic helicity from the simulated halos.
description: 14 pages, 7 figures
Certain Chromatic Sums of Some Cycle Related Graph Classes
Creators: name: Sudev, N. K.
name: Chithra, K. P.
name: Kok, Johan
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 05C15, 05C38

description: Let $\mathcal{C} = \{c_1,c_2, c_3, \ldots,c_k\}$ be a certain type of proper $k$-colouring of a given graph $G$ and $θ(c_i)$ denote the number of times a particular colour $c_i$ is assigned to the vertices of $G$. Then, the colouring sum of a given graph $G$ with respect to the colouring $\cC$, denoted by $ω_{\cC}(G)$, is defined to be $ω(\cC) = \sum\limits_{i=1}^{k}i\,θ(c_i)$. The colouring sums such as $χ$-chromatic sum, $χ^+$-chromatic sum, $b$-chromatic sum, $b^+$-chromatic sum etc. are some of these types of colouring sums that have been studied recently. Motivated by these studies on certain chromatic sums of graphs, in this paper, we study certain chromatic sums for some standard cycle related graphs.
description: 24 pages, 14 figures
Formal Definition of QoE Metrics
Creators: name: Hossfeld, Tobias
name: Heegaard, Poul E.
name: Varela, Martin
name: Möller, Sebastian
Publisher: name: arXiv
Year: 2016
Subjects: subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: This technical report formally defines the QoE metrics which are introduced and discussed in the article "QoE Beyond the MOS: An In-Depth Look at QoE via Better Metrics and their Relation to MOS" by Tobias Hoßfeld, Poul E. Heegaard, Martin Varela, Sebastian Möller, accepted for publication in the Springer journal "Quality and User Experience". Matlab scripts for computing the QoE metrics for given data sets are available in GitHub.
title: Spatial and temporal distributions of larval ‘ōpelu and akule off West Hawaiʻi
title: Spatial and temporal distributions of larval opelu and akule off West Hawaii
titleType: Other
Creators: name: Contreras, Emily A.
Publisher: name: Pacific Islands Fisheries Science Center (U.S.).
Year: 2023

description: NOAA technical memorandum NMFS PIFSC ; 144
Theory of Exceptional Points of Degeneracy in Uniform Coupled-Waveguides and Balance of Gain and Loss
Creators: name: Othman, Mohamed A. K.
name: Capolino, Filippo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a transmission line theory of exceptional points of degeneracy (EPD) in coupled-mode guiding structures, i.e., a theory that illustrates the characteristics of coupled electromagnetic modes under a special dispersion degeneracy condition, yet unexplored in the contest of gain and loss. We demonstrate the concept of Parity-Time ($\cal{PT}$)-symmetry in coupled uniform waveguides with balanced and symmetric gain and loss and how this condition is associated with a second order EPD. We show that by introducing gain into naturally lossy structures provides for the conditions whereby exceptional points of non-Hermitian degeneracies can be manifested, such as in $\cal{PT}$- symmetric structures. Furthermore, we also demonstrate that $\cal{PT}$- symmetry, despite being the method often suggested for obtaining non-Hermitian degeneracies at optical frequencies, is not a necessary condition and indeed we show that EPD can be obtained with broken topological symmetry in uniform TLs. Operating near such special degeneracy conditions leads to potential performance enhancement in a variety of microwave and optical resonators, and devices such as distributed oscillators, including lasers, amplifiers, radiating arrays, pulse compressors, and Qswitching sensors.
description: 13 pages, 10 figures
Cosmology in Weyl Transverse Gravity
Creators: name: Oda, Ichiro
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmology in the Weyl-transverse (WTDiff) gravity in a general space-time dimension. The WTDiff gravity is invariant under both the local Weyl (conformal) transformation and the volume preserving diffeormorphisms (transverse diffeomorphisms) and is believed to be equivalent to general relativity at least at the classical level (perhaps, even in the quantum regime). It is explicitly shown by solving the equations of motion that the FLRW metric is a classical solution in the WTDiff gravity only when the spatial metric is flat, that is, the Euclidean space, and the lapse function is a nontrivial function of the scale factor.
description: 14 pages
Investigation of cosmic ray penetration with wavelet cross-correlation analysis
Creators: name: Yang, Rui-zhi
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Aims. We use Fermi and Planck data to calculate the cross correlation between gamma ray signal and gas distribution in different scales in giant molecular clouds (GMC). Then we investigate the cosmic rays (CRs) penetration in GMCs with these informations. Methods.We use the wavelet technique to decompose both the gamma ray and dust opacity maps in different scales, then we calculate the wavelet cross correlation functions in these scales. We also define wavelet response as an analog to the impulsive response in Fourier transform and calculate that in different scales down to Fermi angular resolution. Results. The gamma ray maps above 2 GeV show strong correlation with the dust opacity maps, the correlation coefficient is larger than 0.9 above a scale of 0.4 degree.The derived wavelet response is uniform in different scales. Conclusions. We argue that the CR above 10 GeV can penetrate the giant molecular cloud freely and the CRs distributions in the same energy range are uniform down to parsec scale.
description: 6 pages, 5 figurs, accepted for publication in A&A
Shannon entropy of brain functional complex networks under the influence of the psychedelic Ayahuasca
Creators: name: Viol, A.
name: Palhano-Fontes, Fernanda
name: Onias, Heloisa
name: de Araujo, Draulio B.
name: Viswanathan, G. M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: The entropic brain hypothesis holds that the key facts concerning psychedelics are partially explained in terms of increased entropy of the brain's functional connectivity. Ayahuasca is a psychedelic beverage of Amazonian indigenous origin with legal status in Brazil in religious and scientific settings. In this context, we use tools and concepts from the theory of complex networks to analyze resting state fMRI data of the brains of human subjects under two distinct conditions: (i) under ordinary waking state and (ii) in an altered state of consciousness induced by ingestion of Ayahuasca. We report an increase in the Shannon entropy of the degree distribution of the networks subsequent to Ayahuasca ingestion. We also find increased local and decreased global network integration. Our results are broadly consistent with the entropic brain hypothesis. Finally, we discuss our findings in the context of descriptions of "mind-expansion" frequently seen in self-reports of users of psychedelic drugs.
description: 27 pages, 6 figures
Vrije Universiteit Amsterdam - CoARA action plan
Creators: name: Vrije Universiteit Amsterdam
name: de Waard, Richard
Publisher: name: Zenodo
Year: 2024
Subjects: CoARA
action plan
open science
research culture
research evaluation
research assessment
Recognition & Rewards
responsible metrics

description: The CoARA action plan for Vrije Universiteit Amsterdam, approved by the rector magnificus on behalf of the executive board. This action plan serves to contribute to, and promote the international reform agenda on research assessment. It describes existing practice and further actions that should ensure that the various forms of outputs, practices and activities maximise the quality and impact of our research. This is a living document and can be updated regularly.
Exceptional points of degeneracy and $\cal{PT}$-symmetry in photonic coupled chains of scatterers
Creators: name: Othman, Mohamed A. K.
name: Galdi, Vincenzo
name: Capolino, Filippo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate the existence of exceptional points of degeneracy (EPD) of periodic eigenstates in non-Hermitian coupled chains of dipolar scatterers. Guided modes supported by these structures can exhibit an EPD in their dispersion diagram at which two or more Bloch eigenstates coalesce, in both their eigenvectors and eigenvalues. We show a second-order modal EPD associated with the parity-time ($\cal{PT}$) symmetry condition, at which each particle pair in the double chain exhibits balanced gain and loss. Furthermore, we also demonstrate a fourth-order EPD occurring at the band edge. Such degeneracy condition was previously referred to as a degenerate band edge in lossless anisotropic photonic crystals. Here, we rigorously show it under the occurrence of gain and loss balance for a discrete guiding system. We identify a more general regime of gain and loss balance showing that $\cal{PT}$-symmetry is not necessary to realize EPDs. Furthermore, we investigate the degree of detuning of the EPD when the geometrical symmetry or balanced condition is broken. These findings open unprecedented avenues toward superior light localization and transport with application to high-Q resonators utilized in sensors, filters, low-threshold switching and lasing.
description: 12 pages, 13 figures
Inclusive breakup of Borromean nuclei
Creators: name: Hussein, Mahir S.
name: Carlson, Brett V.
name: Frederico, Tobias
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We derive the inclusive breakup cross section of a three-fragment projectile nuclei, $a = b +x_1 + x_2$, in the spectator model. The resulting four-body cross section for observing $b$, is composed of the elastic breakup cross section which contains information about the correlation between the two participant fragments, and the inclusive non-elastic breakup cross section. This latter cross section is found to be a non-trivial four-body generalization of the Austern formula \cite{Austern1987}, which is proportional to a matrix element of the form, $\langle\hatρ_{{x_1},{x_2}}\left|\left[W_{x_1} + W_{x_2} + W_{3B}\right]\right|\hatρ_{{x_1}, {x_2}}\rangle$. The new feature here is the three-body absorption, represented by the imaginary potential, $W_{3B}$. We analyze this type of absorption and supply ideas of how to calculate its contribution.
description: 4 pages, one page, Contribution to the Proceedings of Cluster16, May 23-27, 2016, Napoli-Italy, to appear in Journal of Physics Conference Series
A compact and robust diode laser system for atom interferometry on a sounding rocket
Creators: name: Schkolnik, V.
name: Hellmig, O.
name: Wenzlawski, A.
name: Grosse, J.
name: Kohfeldt, A.
name: Döringshoff, K.
name: Wicht, A.
name: Windpassinger, P.
name: Sengstock, K.
name: Braxmaier, C.
name: Krutzik, M.
name: Peters, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present a diode laser system optimized for laser cooling and atom interferometry with ultra-cold rubidium atoms aboard sounding rockets as an important milestone towards space-borne quantum sensors. Design, assembly and qualification of the system, combing micro-integrated distributed feedback (DFB) diode laser modules and free space optical bench technology is presented in the context of the MAIUS (Matter-wave Interferometry in Microgravity) mission. This laser system, with a volume of 21 liters and total mass of 27 kg, passed all qualification tests for operation on sounding rockets and is currently used in the integrated MAIUS flight system producing Bose-Einstein condensates and performing atom interferometry based on Bragg diffraction. The MAIUS payload is being prepared for launch in fall 2016. We further report on a reference laser system, comprising a rubidium stabilized DFB laser, which was operated successfully on the TEXUS 51 mission in April 2015. The system demonstrated a high level of technological maturity by remaining frequency stabilized throughout the mission including the rocket's boost phase.
Organizational Ripple Effects: A Scoping Review Protocol of Managerially Driven Spillovers
Creators: name: Tsatsoulis, Apostolos
Publisher: name: Zenodo
Year: 2024
Subjects: subject: Business and management
subject: Entrepreneurship

description: Spillover effects reflect the unintended impact of actions, decisions, and behaviour. Although these phenomena have received broad scholarly attention due to their frequency and wide-ranging consequences on individuals, teams, and organizations, spillover effects remain an ill-defined concept and the literature is fragmented across various management disciplines. This scoping review aims to demystify the landscape of managerially driven spillover effects on the emotions, behaviours, knowledge, cognition, or performance of intraorganizational stakeholders.
Cultural Attachment Theory - How children form relationships in three cultural contexts in Costa Rica
Creators: name: Schmidt, Wiebke Johanna
Publisher: name: Universität Osnabrück
Year: 2023
Subjects: subject: Frühkindliche Bindung
subject: Ethnographie
subject: Costa Rica
subject: Kulturpsychologie
subject: 150 - Psychologie
subject: 77.53 - Entwicklungspsychologie: Allgemeines

description: Attachment theory originates in a unique historical and cultural context, yet its assumptions are considered universal. A Euro-American middle-class pattern of caregiving and early relationship formation has quickly been regarded the single pathway for optimal development and the only conceptual lens to study relationships worldwide, increasingly being applied in non-Western contexts and to cultural minorities in Western immigration states. The purpose of this study is to revise and expand the monocultural assumptions of attachment theory by examining early attachment development in three cultural contexts in Costa Rica: Urban middle-class San José, rural Guanacaste, and rural indigenous Bribri Talamanca. Using an ethnographic and culture-conscious approach, semi-structured caregiver interviews, ethnographic observations, and recording of videos and photographs were conducted with 30 families per sample with a child between 6 and 28 months of age. Results revealed profound differences in the size of caregiver and attachment networks, the roles and conceptions of caregivers and attachment figures, type and context of caregiver-infant interactions, and the ways and modes through which children form attachments. While the San José sample resembled Western middle-class families in their caregiving networks and beliefs, children in Guanacaste and Bribri Talamanca showed larger networks, however differently composed. In both rural samples, the mother did not necessarily function as the primary caregiver, and children learned to form close relationships with multiple caregivers and the extended family from an early age. Further, there is evidence that not only sensitive caregiving is the main entry to attachment, but primary care, such as feeding, can also serve as an important attachment mechanism. These findings suggest that there is more variety in attachment patterns than attachment theory implies and promotes. It is argued that attachment has not only the function of providing security, but also serves as a platform for cultural learning and is therefore culturally specific in nature. The study highlights the need for culturally conscious attachment research and a shift in practice toward more inclusive and less normative approaches to cultural differences in attachment development and caregiving.
Rotationally-Driven Fragmentation for the Formation of the Binary Protostellar System L1551 IRS 5
Creators: name: Lim, Jeremy
name: Yeung, Paul K. H.
name: Hanawa, Tomoyuki
name: Takakuwa, Shigehisa
name: Matsumoto, Tomoaki
name: Saigo, Kazuya
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Either bulk rotation or local turbulence is widely invoked to drive fragmentation in collapsing cores so as to produce multiple star systems. Even when the two mechanisms predict different manners in which the stellar spins and orbits are aligned, subsequent internal or external interactions can drive multiple systems towards or away from alignment thus masking their formation process. Here, we demonstrate that the geometrical and dynamical relationship between the binary system and its surrounding bulk envelope provide the crucial distinction between fragmentation models. We find that the circumstellar disks of the binary protostellar system L1551 IRS 5 are closely parallel not just with each other but also with their surrounding flattened envelope. Measurements of the relative proper motion of the binary components spanning nearly 30 yr indicate an orbital motion in the same sense as the envelope rotation. Eliminating orbital solutions whereby the circumstellar disks would be tidally truncated to sizes smaller than are observed, the remaining solutions favor a circular or low-eccentricity orbit tilted by up to $\sim$25$^\circ$ from the circumstellar disks. Turbulence-driven fragmentation can generate local angular momentum to produce a coplanar binary system, but which bears no particular relationship with its surrounding envelope. Instead, the observed properties conform with predictions for rotationally-driven fragmentation. If the fragments were produced at different heights or on opposite sides of the midplane in the flattened central region of a rotating core, the resulting protostars would then exhibit circumstellar disks parallel with the surrounding envelope but tilted from the orbital plane as is observed.
description: Accepted for publication in ApJ
Radio transients from accretion-induced collapse of white dwarfs
Creators: name: Moriya, Takashi J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate observational properties of accretion-induced collapse (AIC) of white dwarfs in radio frequencies. If AIC is triggered by accretion from a companion star, a dense circumstellar medium can be formed around the progenitor system. Then, the ejecta from AIC collide to the dense circumstellar medium, making a strong shock. The strong shock can produce synchrotron emission which can be observed in radio frequencies. Even if AIC occurs as a result of white dwarf mergers, we argue that AIC may cause fast radio bursts if a certain condition is satisfied. If AIC forms neutron stars which are so massive that rotation is required to support themselves (i.e., supramassive neutron stars), the supramassive neutron stars may immediately lose their rotational energy by the r-mode instability and collapse to black holes. If the collapsing supramassive neutron stars are strongly magnetized, they may emit fast radio bursts as previously suggested. The AIC radio transients from the single-degenerate systems may be detected in the future radio transient surveys like Very Large Array Sky Survey or the Square Kilometer Array transient survey. Because AIC is suggested to be a gravitational wave source, gravitational waves from AIC may be accompanied by radio-bright transients which can be used to confirm the AIC origin of observed gravitational waves.
description: 6 pages, 1 figure, 1 table, accepted by The Astrophysical Journal Letters
Imagining Afrodescendance and the African Diaspora in Spain: Re-/De-Centering Belonging in Literature, Photography, and Film
Creators: name: Borst, Julia
Publisher: name: Indiana University Press
Year: 2021
Subjects: subject: Afrodescendance
subject: Africa
subject: Spain
subject: Diaspora
subject: Art
subject: 300

description: In recent years, an increasing number of African and Afrodescendant artists in Spain have been speaking from an in-between space defined by the experience of being perceived as the “racialized Other.” Their work is characterized by a political commitment and an aim to provide visibility to their communities and (re)value their African heritage. From a cultural studies and discourse analysis perspective, I explore three diverse examples, poems by Yeison García López, a photobook by Rubén H. Bermúdez, and a documentary by Sergio Aparicio, that all imagine Afrodescendance as a shared narrative and empowering moment relating Africa and her diaspora. In their works, García López, Bermúdez, and Aparicio conceptualize Afrodescendance as a powerful source of belonging. Relating to the multitude of African/Afrodiasporic realities, they offer a decentered space of identification that enables the subject to embrace (new) networks of solidarity and, through active self-positioning, transcend an experience of marginalization characteristic of her/his diasporic condition.
Model-independent estimations for the curvature from standard candles and clocks
Creators: name: Li, Zhengxiang
name: Wang, Guo-Jian
name: Liao, Kai
name: Zhu, Zong-Hong
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Model-independent estimations for the spatial curvature not only provide a test for the fundamental Copernican principle assumption, but also can effectively break the degeneracy between curvature and dark energy properties. In this paper, we propose to achieve model-independent constraints on the spatial curvature from observations of standard candles and standard clocks, without assuming any fiducial cosmology and other priors. We find that, for the popular Union2.1 type Ia supernovae (SNe Ia ) observations, the spatial curvature is constrained to be $Ω_K=-0.045_{-0.172}^{+0.176}$. For the latest joint light-curve analysis (JLA) of SNe Ia observations, we obtain $Ω_K=-0.140_{-0.158}^{+0.161}$. It is suggested that these results are in excellent agreement with the spatially flat Universe. Moreover, compared to other approaches aiming for model-independent estimations of spatial curvature, this method also achieves constraints with competitive precision.
description: 6 pages, 3 figures and 1 table, to be published in ApJ
MPEC 2024-B155 : 2015 DV249
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
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.
Proactive Location-Based Scheduling of Delay-Constrained Traffic Over Fading Channels
Creators: name: Girgis, Antonious M.
name: El-Keyi, Amr
name: Nafie, Mohammed
name: Gohary, Ramy
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, proactive resource allocation based on user location for point-to-point communication over fading channels is introduced, whereby the source must transmit a packet when the user requests it within a deadline of a single time slot. We introduce a prediction model in which the source predicts the request arrival $T_p$ slots ahead, where $T_p$ denotes the prediction window (PW) size. The source allocates energy to transmit some bits proactively for each time slot of the PW with the objective of reducing the transmission energy over the non-predictive case. The requests are predicted based on the user location utilizing the prior statistics about the user requests at each location. We also assume that the prediction is not perfect. We propose proactive scheduling policies to minimize the expected energy consumption required to transmit the requested packets under two different assumptions on the channel state information at the source. In the first scenario, offline scheduling, we assume the channel states are known a-priori at the source at the beginning of the PW. In the second scenario, online scheduling, it is assumed that the source has causal knowledge of the channel state. Numerical results are presented showing the gains achieved by using proactive scheduling policies compared with classical (reactive) networks. Simulation results also show that increasing the PW size leads to a significant reduction in the consumed transmission energy even with imperfect prediction.
description: Conference: VTC2016-Fall, At Montreal-Canada
L’esthétique du débordement et le débordement de l’esthétique: la violence dans l’oeuvre de Lyonel Trouillot
Creators: name: Borst, Julia
Publisher: name: Johns Hopkins University Press
Year: 2012
Subjects: subject: Violence
subject: Migration
subject: Diaspora
subject: 300

description: Dans ses romans, Lyonel Trouillot expose une réalité dominée par une violence démesurée, virulente et débordante. En se servant des particularités inhérentes au phénomène de la violence, l’auteur inscrit une “esthétique du débordement” au niveau de la représentation dans la structure du roman même, ce qui transforme le texte en violence et mène à un “débordement de l’esthétique”. Cette fictionnalisation de la violence permet à Trouillot de ne pas minimiser la violence, mais de la laisser éclater de toute sa force et d’ouvrir des espaces littéraires pour l’énoncer et la dénoncer en même temps.
Migratory Movements in Life Stories and Literary Writing: A Conversation with Joaquín Mbomío Bacheng on Equatoguinean Literature and Afro-Diasporic Communities in Europe
Creators: name: Borst, Julia
Publisher: name: Indiana University Press
Year: 2017
Subjects: subject: Equatorial Guinea
subject: Spain
subject: Migration
subject: Diaspora
subject: Interview
subject: Europe
subject: Culture
subject: Africa
subject: Writing
subject: 300

description: In this interview, Equatoguinean writer Joaquín Mbomío Bacheng talks about his own experience of migrating to and living in Europe, an experience likewise echoed in his literary writing. in this context, the author not only tackles topics such as the discrimination and stereotyping of African immigrants, but also broaches the issue of enriching cultural encounters experienced by the Afro-diasporic subject. Pointing out the essential role Afro-diasporic communities could assume as mediators between European societies and African cultures, Mbomío Bacheng pleads for an open and continuing dialogue of cultures that promotes mutual respect and transcultural dynamics from which everyone might benefit. Moreover, by illustrating the particular colonial and postcolonial relation of Equatorial Guinea to Spain, he explains the originality of Equatoguinean literature, which still tends to be rather invisible in both Spain and Equatorial Guinea.
A comparative experimental study on the deviation of the ideal selectivity in HDTMS-functionalized and untreated ceramic structures with pores in the upper mesoporous range
Creators: name: Besser, Benjamin
name: Veltzke, Thomas
name: Dreyer, Jochen A. H.
name: Bartels, Julia
name: Baune, Michael
name: Kroll, Stephen
name: Thöming, Jorg
name: Rezwan, Kurosch
Publisher: name: Elsevier
Year: 2015
Subjects: subject: Knudsen diffusion
subject: Mesoporous ceramic membrane
subject: Surface functionalization
subject: Gas permeation
subject: Carbon dioxide adsorption
subject: Mimenima
subject: 620

description: Mesoporous ceramic capillary membranes with mean pore sizes of about 20 nm are prepared as model structures to investigate the influence of an altered surface chemistry on the flow behavior of gases. To modify the membrane surface, a wet chemical silanization process with hexadecyltrimethoxysilane (HDTMS) is used to gain an alkyl-functionalized surface. Structural and surface characterizations show that the surface chemistry is altered without affecting the mean pore diameter. For the non-functionalized membrane, single gas permeation measurements at 20 °C reveal ideal permselectivities which are in good agreement with the Knudsen theory. In contrast, the HDTMS-functionalized membrane shows permselectivities regarding carbon dioxide (CO2) which deviate about 20% from Knudsen theory. The gas permeation measurements further indicate a relative flow enhancement for CO2 in comparison to nitrogen (N2), argon (Ar) and methane (CH4). Adsorption and desorption isotherms of CO2 and N2 at 20 °C show a decreased specific adsorption capacity for both gases, while the adsorption selectivity for CO2/N2 is increased. This indicates a weaker interaction of gas molecules and membrane surface due to HDTMS functionalization. This weaker gas–solid interaction along with the increased adsorption selectivity is proposed as reason for the experimentally observed deviation of the permselectivities from Knudsen theory.
EmpiriciSN: Re-sampling Observed Supernova/Host Galaxy Populations using an XD Gaussian Mixture Model
Creators: name: Holoien, Thomas W. -S.
name: Marshall, Philip J.
name: Wechsler, Risa H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We describe two new open source tools written in Python for performing extreme deconvolution Gaussian mixture modeling (XDGMM) and using a conditioned model to re-sample observed supernova and host galaxy populations. XDGMM is new program for using Gaussian mixtures to do density estimation of noisy data using extreme deconvolution (XD) algorithms that has functionality not available in other XD tools. It allows the user to select between the AstroML (Vanderplas et al. 2012; Ivezic et al. 2015) and Bovy et al. (2011) fitting methods and is compatible with scikit-learn machine learning algorithms (Pedregosa et al. 2011). Most crucially, it allows the user to condition a model based on the known values of a subset of parameters. This gives the user the ability to produce a tool that can predict unknown parameters based on a model conditioned on known values of other parameters. EmpiriciSN is an example application of this functionality that can be used for fitting an XDGMM model to observed supernova/host datasets and predicting likely supernova parameters using on a model conditioned on observed host properties. It is primarily intended for simulating realistic supernovae for LSST data simulations based on empirical galaxy properties.
description: 10 pages, 6 figures. Manuscript will be submitted to The Astronomical Journal. XDGMM and empiriciSN are open source and available for download via github. or a brief video explaining this paper, see https://youtu.be/5bX34GHk1Rg
Magnetic Field Induced Vortex Lattice Transition in HgBa$_{2}$CuO$_{4+δ}$
Creators: name: Lee, Jeongseop A.
name: Xin, Yizhou
name: Stolt, I.
name: Halperin, W. P.
name: Kuhns, A. P. Reyes P. L.
name: Chan, M. K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Measurements of the $^{17}$O nuclear magnetic resonance (NMR) quadrupolar spectrum of apical oxygen in HgBa$_{2}$CuO$_{4+δ}$ were performed over a range of magnetic fields from 6.4 to 30\,T in the superconducting state. Oxygen isotope exchanged single crystals were investigated with doping corresponding to superconducting transition temperatures from 74\,K underdoped, to 78\,K overdoped. The apical oxygen site was chosen since its NMR spectrum has narrow quadrupolar satellites that are well separated from any other resonance. Non-vortex contributions to the spectra can be deconvolved in the time domain to determine the local magnetic field distribution from the vortices. Numerical analysis using Brandt's Ginzburg-Landau theory was used to find structural parameters of the vortex lattice, penetration depth, and coherence length as a function of magnetic field in the vortex solid phase. From this analysis we report a vortex structural transition near 15\,T from an oblique lattice with an opening angle of $73^{\circ}$ at low magnetic fields to a triangular lattice with $60^{\circ}$ stabilized at high field. The temperature for onset of vortex dynamics has been identified with vortex lattice melting. This is independent of the magnetic field at sufficiently high magnetic field similar to that reported for YBa$_2$Cu$_3$O$_7$ and Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+δ}$ and is correlated with mass anisotropy of the material. This behavior is accounted for theoretically only in the limit of very high anisotropy.
UV-IR color profiles of the outer regions of 2K nearby S$^{4}$G galaxies
Creators: name: Bouquin, Alexandre Y. K.
name: de Paz, Armando Gil
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present our new, spatially-resolved, photometry in FUV and NUV from images obtained by GALEX, and IRAC1 (3.6 $μ$m) photometry obtained by the Spitzer Space Telescope. We analyzed the surface brightness profiles $μ_{\rm{FUV}}$, $μ_{\rm{NUV}}$, $μ_{[3.6]}$, as well as the radial evolution of the (FUV-NUV), (FUV - [3.6]), and (NUV - [3.6]) colors in the Spitzer Survey of Stellar Structures in Galaxies (S$^{4}$G) galaxies (d$$50%) of intermediary GALEX Green Valley (GGV) galaxies' outer disks are becoming redder. An outside-in quenching mechanism such as environmentally-related mechanisms such as starvation or ram-pressure-stripping could explain our results.
description: 3 pages 1 figure, to be published in the Proceedings of IAU Symposium 321, "Formation and evolution of galaxy outskirts", Eds. A. Gil de Paz, J. C. Lee & J. H. Knapen, Cambridge University Press, Cambridge