cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Optimal eigenvalue estimate for the Dirac-Witten operator on bounded domains with smooth boundary
Creators: name: Maerten, Daniel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: Eigenvalue estimate for the Dirac-Witten operator is given on bounded domains (with smooth boundary) of spacelike hypersurfaces satisfying the dominant energy condition, under four natural boundary conditions (MIT, APS, modified APS, and chiral conditions). This result is a generalisation of Friedrich's inequality for the usual Dirac operator. The limiting cases are also investigated.
description: 2007, 18 pages, submitted 02 June 2007
Evidence of nematic order and nodal superconducting gap along [110] direction in RbFe2As2
Creators: name: Liu, Xi
name: Tao, Ran
name: Ren, Mingqiang
name: Chen, Wei
name: Yao, Qi
name: Wolf, Thomas
name: Yan, Yajun
name: Zhang, Tong
name: Feng, Donglai
Publisher: name: arXiv
Year: 2018
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Unconventional superconductivity often intertwines with various forms of order, such as the "nematic" order which breaks the rotational symmetry of the lattice. Investigation of these ordered phases sheds crucial light on the superconductivity itself. Here we report a low-temperature scanning tunneling microscopy (STM) study on RbFe2As2, a heavily hole-doped Fe-based superconductor (FeSC). We observe significant symmetry breaking in its electronic structure and magnetic vortex which differentiates the (π, π) and (π, -π) directions of the unfolded Brillouin zone (BZ). It is thus a novel nematic state, distinct from the nematicity of undoped/lightly-doped FeSCs which breaks the (π, 0) / (0, π) equivalence. Moreover, we observe a clear "V"-shaped superconducting gap which can be well fitted with a nodal gap function. The gap is found to be suppressed on surface Rb vacancies and at step edges, and the suppression is particularly strong at the [110]-oriented edges. This is possibly due to a dx2-y2 like pairing component with nodes along the [110] directions. We further demonstrated that such (π, π) nematic state can be suppressed via surface electron doping to RbFe2As2, and the superconductivity is subsequently enhanced. Our results thus highlight the intimate connection between nematicity and superconducting pairing in iron-based superconductors.
description: 19 pages, 7 figures, supplementary materials included
von Winterfeld, Dethard: Die Abteikirche Maria Laach. Geschichte – Architektur – Kunst – Bedeutung. Unter Mitarbeit von Mönchen der Abtei Maria Laach
Creators: name: Bulitta, Johannes
Publisher: name: Theologische Revue
Year: 2021

description: Theologische Revue, Bd. 117 (2021): Juli
A MST algorithm for source detection in gamma-ray images
Creators: name: Campana, Riccardo
name: Massaro, Enrico
name: Gasparrini, Dario
name: Cutini, Sara
name: Tramacere, Andrea
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We developed a source detection algorithm based on the Minimal Spanning Tree (MST), that is a graph-theoretical method useful for finding clusters in a given set of points. This algorithm is applied to gamma-ray bidimensional images where the points correspond to the arrival direction of photons, and the possible sources are associated with the regions where they clusterize. Some filters to select these clusters and to reduce the spurious detections are introduced. An empirical study of the statistical properties of MST on random fields is carried in order to derive some criteria to estimate the best filter values. We introduce also two parameters useful to verify the goodness of candidate sources. To show how the MST algorithm works in the practice, we present an application to an EGRET observation of the Virgo field, at high galactic latitude and with a low and rather uniform background, in which several sources are detected.
description: 10 pages, 7 figures. Accepted for publication in MNRAS
Universality class of the pair contact process with diffusion
Creators: name: Smallenburg, F.
name: Barkema, G. T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The pair contact process with diffusion (PCPD) is studied with a standard Monte Carlo approach and with simulations at fixed densities. A standard analysis of the simulation results, based on the particle densities or on the pair densities, yields inconsistent estimates for the critical exponents. However, if a well-chosen linear combination of the particle and pair densities is used, leading corrections can be suppressed, and consistent estimates for the independent critical exponents delta=0.16(2), beta=0.28(2) and z=1.58 are obtained. Since these estimates are also consistent with their values in directed percolation (DP), we conclude that PCPD falls in the same universality class as DP.
description: 8 pages, 8 figures, accepted by Phys. Rev. E (not yet published)
Density Fluctuations in the Oscillatory Phase of Nonclassical Inflaton in FRW Universe
Creators: name: Venkataratnam, K. K.
name: Suresh, P. K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Using coherent and squeezed state formalisms of quantum optics for a minimally coupled non-classical inflaton in the FRW mertic is studied, in semiclassical theory of gravity. The leading order solution for the semiclassical Einstein equations in the coherent, squeezed and squeezed vacuum states are obtained perturbatively and are exhibit powerlaw expansion behaviour. The validity of the semiclassical theory is examined in the squeezed vacuum state in the oscillatory phase of the inflaton. The semiclassical theory in the oscillatory phase of the non-classical inflaton holds only if the associated squeezing parameter is much less compared to unity. Quantum fluctuations of the inflaton is also examined in coherent and squeezed state formalisms.
description: 14 pages, 2 figures, To appear in Int.J.Mod.Phys.D
title: Development of the Near-Term Forecast of Inflation for Uzbekistan: Application of FAVAR and BVAR models
Creators: name: Boymirzaev, Temurbek
Publisher: name: Graduate Institute of International and Development Studies
publisherIdentifier: https://ror.org/007ygn379
publisherIdentifierScheme: ROR
Year: 2025

description: Graduate Institute of International and Development Studies Working Paper ; no. 06/2025
Communication Channels Used by Academic Staff in Interacting with Their Students
Creators: name: Baghestan, Abbas Ghanbari
name: Mehrnoosh Akhtari Zavareh
name: Hassan, Musa Abu
Publisher: name: figshare
Year: 2018
Subjects: subject: 200199 Communication and Media Studies not elsewhere classified
subject: FOS: Media and communications
subject: 200101 Communication Studies

description: The aim of this paper is to report the findings on the impact of communication technology as a channel for interaction between academic staff and their students, conducted at a Malaysian higher learning institution.
The study focused on media choice and it attempted to determine the communication channels mostly used
by academic staff in interacting with their students and the reasons for selecting these channels. It also intended to find out whether there was a significant relationship between communication channels mostly used
by academic staff and their perception of media richness. The results revealed that although the existence
of new communication technologies such as the internet offers faster and cheaper facilities, face-to-face
communication is still the most used and preferred communication channel by academic staff in interacting
with their students. In addition, there was a significant relationship between the communication channel
mostly used by respondents and their perception of media richness and social presence. This explained why
the higher level of social presence, the higher the level of experience with a channel would be. The findings
of this study extended two of the most widely investigated media choice theories; Media Richness Theory
(MRT) and Social Presence Theory (SPT).
title: Deliverable 7.2: Plan to implement the technical Coordination of INSPIRE
Creators: name: Catarino, Ana
name: Everaert, Gert
Publisher: name: Flanders Marine Institute
Year: 2025

description: This report outlines the actions necessary for technical coordination of the project INSPIRE, with a particular focus on the structure of its Work Packages and the associated responsibilities of their leaders. It also highlights the steps involved in sharing and disseminating project results. The report emphases quality assurance measures and risk management. The Project Coordinator, supported by the Management Support Team, will assume the critical role of monitoring technical progress, coordinating communication between Work Packages, and implementing mitigation measures when required.
description: Title :
Volume :
Issue :
Pagination : 16
Factors Influencing Media Choice For Interact With Their Students among Lectures of Two Academic Institutions Case of Iran
Creators: name: Baghestan, Abbas Ghanbari
name: Rahmati, Muhammad
name: Hassan, Musa Abu
Publisher: name: figshare
Year: 2018
Subjects: subject: 200199 Communication and Media Studies not elsewhere classified
subject: FOS: Media and communications
subject: 200101 Communication Studies

description: The aim of this paper is to report the findings on the impact of communication technology as channels on interaction
between academic staff and their students, conducted at an Iranian higher learning institution. Study focused on media
choice and it attempted to determine the communication channels most used by academic staffs in interacting with their students and the reasons they chose these channels. It also intended to find out whether there was a significant
relationship between communication channels most used by academic staffs and their perception of media richness. The
results revealed that though there is the existence of new communication technologies such as the internet which offers
faster and cheaper facilities, Face-to-Face communication is the most used and preferred communication channel by
academic staffs in interacting with their students. In addition there was significant relationship between communication
channel most used by respondents and their perception of media richness and social presence. That’s why with the
higher level of social presence, their level of experience with a channel increases. The findings of this study extend two
of the most widely investigated media choice theories: Media Richness Theory (MRT) and Social Presence Theory
(SPT).
ALOPECIA AREATA'S IMPACT ON QOL: DEMOGRAPHIC & CLINICAL LINKS
Creators: name: SHUMAILA SHEIKH
name: SADAF IBRAHIM
name: MIRZA TASAWER BAIG
name: UZMA SHAHID
name: MARYAM AHMED
name: SYED ZIA UL HASNAIN
name: NOORULAIN PIRZADA
name: ABID KHAN
Publisher: name: Zenodo
Year: 2024
Subjects: Alopecia Areata, Quality of Life, Demography.

description: Abstract

Alopecia areata, a non-scarring form of hair loss, can considerably impact quality of life. This study explores how demographic and clinical factors influence the quality of life for individuals living with this condition. Method: We conducted a cross-sectional study at Ziauddin Hospital, Karachi, Pakistan, to investigate the influence of demographic and clinical features on quality of life (QoL) in alopecia areata patients (n=150). We collected demographic and clinical data, assessed disease severity using the Severity of Alopecia Tool (SALT) score, and evaluated QoL with the Dermatology Life Quality Index (DLQI) for adults and the Child (CDLQI) for children. Multivariate logistic regression then analyzed the relationships between patient characteristics and QoL. Result: Among the 150 participants, the average SALT score indicated moderate alopecia areata severity (5.78 ± 0.95). The mean DLQI scores for mild and moderate cases of AA were 7.9 and 10.1 respectively and the difference was insignificant. AA had mostly moderate and small effects on the QoL of adult and pediatric patients 46.6% and 35.6% respectively Interestingly, gender emerged as a significant factor, with females reporting higher QoL impairment (higher DLQI scores) compared to males (p < 0.05). Furthermore, patients with no family history of AA experienced significantly lower QoL than those with a positive family history (p = 0.033). Conclusion: Our findings suggest that, beyond disease severity, the psychological burden of alopecia areata manifests differently based on gender and family history. This underscores the importance of considering these factors when designing treatment approaches and support systems to optimize quality of life for individuals with this condition.
title: Mail à Michel Saag, copie à Dominique Mathez, transféré à Bernard Hirschel
Creators: name: Leibowitch, Jacques
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020

description: Source: http://www.calames.abes.fr/pub/ms/Calames-2019311113393095
Polariton condensation in $S$- and $P$-flatbands in a two-dimensional Lieb lattice
Creators: name: Klembt, Sebastian
name: Harder, Tristan H.
name: Egorov, Oleg A.
name: Winkler, Karol
name: Suchomel, Holger
name: Beierlein, Johannes
name: Emmerling, Monika
name: Schneider, Christian
name: Höfling, Sven
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the condensation of exciton-polaritons in a two-dimensional Lieb lattice of micropillars. We show selective polariton condensation into the flatbands formed by S and P$_{x;y}$ orbital modes of the micropillars under non-resonant laser excitation. The real space mode patterns of these condensates are accurately reproduced by the calculation of related Bloch modes of S- and P-flatbands. Our work emphasizes the potential of exciton-polariton lattices to emulate Hamiltonians of advanced potential landscapes. Furthermore, the obtained results provide a deeper inside into the physics of flatbands known mostly within the tight-binding limit.
Measurement of the parity-violating triton emission asymmetry in the reaction 6Li(n,alfa)3H with polarised cold neutrons
Creators: name: Vesna, V. A.
name: Gledenov, Yu. M.
name: Nesvizhevsky, V. V.
name: Petoukhov, A. K.
name: Sedyshev, P. V.
name: Soldner, T.
name: Zimmer, O.
name: Shulgina, E. V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We describe measurements of the parity-violating (P-odd) triton emission asymmetry coefficient in the 6Li(n,alfa)3H reaction with polarised cold neutrons. Experiments were carried out at the Petersburg Nuclear Physics Institute (Gatchina, Russia) and at the Institut Laue-Langevin (Grenoble, France). We employed an ionisation chamber in a configuration allowing us to suppress the left-right asymmetry well below 10^(-8). A test for a false asymmetry due to eventual target impurities ("zero test") resulted in the value (0.0+-0.5)x10^(-8). As final result we obtained P-odd effect (-8.6+-2.0)x10^(-8).
Variation among vocalizations of Taraba major (Aves: Thamnophilidae) subspecies
Creators: name: Sementili-Cardoso, Guilherme
name: Rodrigues, Fernanda Gonçalves
name: Martins, Rafael Martos
name: Gerotti, Raphael Whitacker
name: Vianna, Renata Marques
name: Donatelli, Reginaldo José
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Biophysics
subject: Medicine
subject: Neuroscience
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Geographical variation of bird vocalizations may be related to factors influencing sound production and sound propagation. If birds, e.g. the Great Antshrike (Taraba major), produce vocalizations that develop normally in the absence of learning, these variations may reflect evolutionary divergence within species. In this case, vocal variation could be influenced by habitat structure, since abiotic features and vegetal cover affect sound propagation through environment. Selective pressures may be acting on populations in different ways, which could culminate in a process of speciation. Thus, we searched for structural variation of Great Antshrike vocalizations between subspecies and sought for relationships between these vocal variation and environmental structure. We found variations in frequency and time features of vocalizations among subspecies, which are correlated to latitude, elevation and climate. We also observed an increase in vocal differences along with an increase in distances between individuals, which could reflect isolation of subspecies and the vocal adaptation to different environments.
Steady and Stable: Numerical Investigations of Nonlinear Partial Differential Equations
Creators: name: Harwood, R. Corban
Publisher: name: arXiv
Year: 2018
Subjects: subject: History and Overview (math.HO)
subject: FOS: Mathematics

description: A nonlinear partial differential equation is a nonlinear relationship between an unknown function and how it changes due to two or more input variables. A numerical method reduces such an equation to arithmetic for quick visualization, but this can be misleading if the method is not developed and operated carefully due to numerical oscillations, instabilities, and other artifacts of the programmed solution. This chapter provides a friendly introduction to error analysis of numerical methods for nonlinear partial differential equations along with modern approaches to visually demonstrate analytical results with confidence. These techniques are illustrated through several detailed examples with a relevant governing equation, and lead to open questions suggested for undergraduate-accessible research.
description: 37 pages, 11 figures, 2 tables. One of eleven chapters in "Foundations for Undergraduate Research in Mathematics: A Primer for Undergraduate Research", In: Wootton A. et al (eds) A Primer for Undergraduate Research. Birkh\"auser, Cham (2017)
title: ADCO, Septième cartulaire de Saint-Étienne de Dijon (1661-1665), Cart. 29 (G 134), 996 folios, f. 0202
Creators: name: de la Côte d'Or, Archives départementales
name: Petot, Frédéric
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2012
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: cartulaire
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge

description: Septième cartulaire de Saint-Étienne de Dijon (1661-1665), Archives départementales de la Côte-d'Or, Cart. 29 (G 134), 996 folios, f. 0202, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Septième cartulaire de Saint-Étienne de Dijon (1661-1665), Archives départementales de la Côte-d'Or, Cart. 29 (G 134), 996 folios, f. 0202, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https://manuscrits.cbma-project.eu/
description: Provenance: abbaye Saint-Étienne de Dijon
description: Provenance: http://www.wikidata.org/entity/Q15945019
On the electromagnetic properties of active media
Creators: name: Nistad, Bertil
name: Skaar, Johannes
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Several results concerning active media or metamaterials are proved and discussed. In particular, we consider the permittivity, permeability, wave vector, and refractive index, and discuss stability, refraction, gain, and fundamental limitations resulting from causality.
Verger, Jacques / Sohn, Andreas: Ludwig von Pastor (1854–1928). Universitätsprofessor, Historiker der Päpste, Direktor des Österreichischen Historischen Instituts in Rom und Diplomat / Professeur, historien des papes, directeur de l’Institut historique au
Creators: name: Ernesti, Jörg
Publisher: name: Theologische Revue
Year: 2021

description: Theologische Revue, Bd. 117 (2021): Juli
Magnetic Field Distribution Due to Domain Walls in Unconventional Superconductors
Creators: name: Logoboy, N. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Steady-state properties of Bloch domain wall (DW) in superconducting ferromagnet (SCFM) are studied. The distribution of magnetic field above and below the surface of the SCFM due to the permanent magnetization supercurrent flowing in the DW plane is calculated by solving Maxwell equations supplemented by London equation. It is shown that part of the magnetic flux of the two neighboring domains closures in the nearest vicinity of the surface of the sample giving rise to declination of the line of the force from being parallel to the DW plane. As a result, the value of the normal component of magnetic field at the surface of the sample reaches only half of the value of the bulk magnetic flux. At the distances of the order of value of London penetration depth the magnetic field decreases as inverse power law due to the long-range character of dipole-dipole interaction. The last two circumstances are important for comparison the calculated magnetic field with the data obtained by the methods on measurement of normal component of magnetic field, e. g. Hall probe technique, aimed to confirm the existence of magnetic order parameter in unconventional superconductor.
description: 5 pages, 4 figures
title: ADCO, Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Cart. 32 (G 136), 745 folios, f. 0988
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2012
name: Petot, Frédéric
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: cartulaire
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Archives départementales de la Côte-d'Or, Cart. 32 (G 136), 745 folios, f. 0988, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Archives départementales de la Côte-d'Or, Cart. 32 (G 136), 745 folios, f. 0988, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye Saint-Étienne de Dijon
description: Provenance: http://www.wikidata.org/entity/Q15945019
title: Deliverable 7.3: Data management plan INSPIRE
Creators: name: Dhondt, Charlotte
name: Catarino, Ana
name: Van Emmerik, Tim, T.H.M.
name: Petelin, Marko, M.
name: González-Fernández, Daniel
name: De Keukelaere, Liesbeth
name: Everaert, Gert
Publisher: name: Flanders Marine Institute
Year: 2023

description: Title :
Volume :
Issue :
Pagination : 26
Master Equation Emulation and Coherence Preservation with Classical Control of a Superconducting Qubit
Creators: name: Vlachos, Evangelos
name: Zhang, Haimeng
name: Maurya, Vivek
name: Marshall, Jeffrey
name: Albash, Tameem
name: Levenson-Falk, Eli M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Open quantum systems are a topic of intense theoretical research. The use of master equations to model a system's evolution subject to an interaction with an external environment is one of the most successful theoretical paradigms. General experimental tools to study different open system realizations have been limited, and so it is highly desirable to develop experimental tools which emulate diverse master equation dynamics and give a way to test open systems theories. In this paper we demonstrate a systematic method for engineering specific system-environment interactions and emulating master equations of a particular form using classical stochastic noise. We also demonstrate that non-Markovian noise can be used as a resource to extend the coherence of a quantum system and counteract the adversarial effects of Markovian environments.
description: 14 pages, 11 figures
Weighted estimates for the Calderón commutator
Creators: name: Chen, Jiecheng
name: Hu, Guoen
Publisher: name: arXiv
Year: 2018
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics

description: In this paper, the authors establish some weighted estimates for the Calderón commutator defined by \begin{eqnarray*} &&\mathcal{C}_{m+1,\,A}(a_1,\dots,a_{m};f)(x) &&\quad={\rm p.\,v.}\,\int_{\mathbb{R}}\frac{P_2(A;\,x,\,y)\prod_{j=1}^m(A_j(x)-A_j(y))}{(x-y)^{m+2}}f(y){\rm d}y, \end{eqnarray*} with $P_2(A;\,x,\,y)=A(x)-A(y)-A'(y)(x-y)$. Dominating this operator by multi(sub)linear sparse operators, the authors establish the weighted bounds from $L^{p_1}(\mathbb{R},w_1)$ $\times\dots\times L^{p_m}(\mathbb{R},w_m)$ to $L^{p}(\mathbb{R},ν_{\vec{w}})$, with $p_1,\dots,p_m \in (1,\,\infty)$, $1/p=1/p_1+\dots+1/p_m$, and $\vec{w}=(w_1,\,\dots,\,w_m)\in A_{\vec{P}}(\mathbb{R}^{m+1})$. The authors also obtain the weighted weak type endpoint estimates for this operator
description: 21 pages
title: The Diurnal Variation in Stratospheric Ozone from MACC Reanalysis, ERA-Interim, WACCM, and Earth Observation Data: Characteristics and Intercomparison
Creators: name: Schanz, Ansgar
name: Hocke, Klemens
name: Kämpfer, Niklaus
name: Chabrillat, Simon
name: Inness, Antje
name: Palm, Mathias
name: Notholt, Justus
name: Boyd, Ian
name: Parrish, Alan
name: Kasai, Yasuko
Publisher: name: University of Massachusetts Amherst
Year: 2021
Subjects: subject: stratospheric ozone
subject: diurnal ozone cycle
subject: photochemistry
subject: dynamics
subject: reanalysis
subject: MACC
subject: ERA-Interim
subject: WACCM
subject: SMILES
subject: microwave radiometry
subject: Astrophysics and Astronomy

description: In this study, we compare the diurnal variation in stratospheric ozone of the MACC (Monitoring Atmospheric Composition and Climate) reanalysis, ECMWF Reanalysis Interim (ERA-Interim), and the free-running WACCM (Whole Atmosphere Community Climate Model). The diurnal variation of stratospheric ozone results from photochemical and dynamical processes depending on altitude, latitude, and season. MACC reanalysis and WACCM use similar chemistry modules and calculate a similar diurnal cycle in ozone when it is caused by a photochemical variation. The results of the two model systems are confirmed by observations of the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) experiment and three selected sites of the Network for Detection of Atmospheric Composition Change (NDACC) at Mauna Loa, Hawaii (tropics), Bern, Switzerland (midlatitudes), and Ny-Ålesund, Svalbard (high latitudes). On the other hand, the ozone product of ERA-Interim shows considerably less diurnal variation due to photochemical variations. The global maxima of diurnal variation occur at high latitudes in summer, e.g., near the Arctic NDACC site at Ny-Ålesund, Svalbard. The local OZORAM radiometer observes this effect in good agreement with MACC reanalysis and WACCM. The sensed diurnal variation at Ny-Ålesund is up to 8% (0.4 ppmv) due to photochemical variations in summer and negligible during the dynamically dominated winter. However, when dynamics play a major role for the diurnal ozone variation as in the lower stratosphere (100–20 hPa), the reanalysis models ERA-Interim and MACC which assimilate data from radiosondes and satellites outperform the free-running WACCM. Such a domain is the Antarctic polar winter where a surprising novel feature of diurnal variation is indicated by MACC reanalysis and ERA-Interim at the edge of the polar vortex. This effect accounts for up to 8% (0.4 ppmv) in both model systems. In summary, MACC reanalysis provides a global description of the diurnal variation of stratospheric ozone caused by dynamics and photochemical variations. This is of high interest for ozone trend analysis and other research which is based on merged satellite data or measurements at different local time
Molecular gas in NUclei of GAlaxies (NUGA): VIII The Seyfert 2 NGC6574
Creators: name: Lindt-Krieg, E.
name: Eckart, A.
name: Neri, R.
name: Krips, M.
name: Pott, J. -U.
name: Garcia-Burillo, S.
name: Combes, F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Within the frame of the NUclei of GAlaxies (NUGA) project, we have determined the distribution and kinematics of the molecular gas within the central kpc with high spatial resolution (100-150pc), for a sample of active galaxies. The goal is to study the gas-fueling mechanisms in AGN. We present interferometric observations of 12CO(1-0) and 12CO(2-1) line emission from the Seyfert2 galaxy NGC6574, obtained with the IRAM Plateau de Bure Interferometer (PdBI). These data have been combined with 30m mapping data in these lines to correct for the flux resolved by the interferometer. At an angular resolution of 0.7'' (about 110pc), the 12CO(2-1) emission is resolved into an inner disk with a radius of 300pc.
description: 13 pages, 15 figures. accepted by A&A
Decaying warm dark matter and structure formation
Creators: name: Kuo, Jui-Lin
name: Lattanzi, Massimiliano
name: Cheung, Kingman
name: Valle, José W. F.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We examine the cosmology of warm dark matter (WDM), both stable and decaying, from the point of view of structure formation. We compare the matter power spectrum associated to WDM masses of 1.5 keV and 0.158 keV, with that expected for the stable cold dark matter $Λ$CDM$\equiv$SCDM paradigm, taken as our reference model. We scrutinize the effects associated to the warm nature of dark matter, as well as the fact that it decays. The decaying warm dark matter (DWDM) scenario is well-motivated, emerging in a broad class of particle physics theories where neutrino masses arise from the spontaneous breaking of a continuous global lepton number symmetry. The majoron arises as a Nambu-Goldstone boson, and picks up a mass from gravitational effects, that explicitly violate global symmetries. The majoron necessarily decays to neutrinos, with an amplitude proportional to their tiny mass, which typically gives it cosmologically long lifetimes. Using N-body simulations we show that our DWDM picture leads to a viable alternative to the $Λ$CDM scenario, with predictions that can differ substantially on small scales.
description: V2: 28 pages, 11 figures. Replaced to match published version
A uses and gratification perspective on social media usage and online marketing
Creators: name: Baghestan, Abbas Ghanbari
name: Froget, J. R. L.
name: Asfaranjan, Y. S.
Publisher: name: figshare
Year: 2018
Subjects: subject: 200101 Communication Studies
subject: FOS: Media and communications
subject: 200199 Communication and Media Studies not elsewhere classified

description: This study explores the use of Facebook in Mauritius under the lens of the famous Uses and Gratifications theory. The objectives of the study are: to identify the strongest motivators of Facebook use in Mauritius and to evaluate Facebook intensity based on socio-demographic background of respondents. The study presents 8 motives to create a model to predict Facebook use: use to meet people, use for entertainment, use to maintain relationships, use for social events, use to share media product, use for product inquiry, use for discussion, and the use for information. These variables are measured through an online survey questionnaire distributed among a sample of 392 Mauritian Facebook users. The variables are tested for
correlation with Facebook use which is measured through the Facebook intensity scale. All of the eight factors
were found to have positive correlations with Facebook use. The factors are also regressed against Facebook
use to determine which factors are predictors of Facebook use and which one is the strongest. It is found that
‘use for entertainment’ is the strongest followed by ‘use for discussion’, ‘use to meet people’ and ‘use to
maintain relationships. The study also looks into the socio-demographic characteristics of Facebook users in
Mauritius and how the differences might effect on its usage. It is discovered that there is a difference in
Facebook use between groups of different monthly income level. This study therefore explores a new and hot
topic of study in the field of communication and mass media. It contributes to the body of knowledge by
identifying scientifically four predictors of Facebook use. It also points out that level of income of different
groups of people will affect Facebook use.
Optical Spectroscopy of Active Galactic Nuclei in SA57
Creators: name: Trevese, D.
name: Zitelli, V.
name: Vagnetti, F.
name: Boutsia, K.
name: Stirpe, G. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The cosmological evolution of X-ray-selected and optically selected Active Galactic Nuclei (AGNs) show different behaviours interpreted in terms of two different populations. The difference is evident mainly for low luminosity AGNs (LLAGNs), many of which are lost by optical photometric surveys. We are conducting a spectroscopical study of a composite sample of AGN candidates selected in SA57 following different searching techniques, to identify low luminosity AGNs and break down the sample into different classes of objects. AGN candidates were obtained through optical variability and/or X-ray emission. Of special interest are the extended variable objects, which are expected to be galaxies hosting LLAGNs. Among the 26 classified objects a fair number (9) show typical AGN spectra. 10 objects show Narrow Emission Line Galaxy spectra, and in most of them (8/10) optical variability suggests the presence of LLAGNs.
description: 7 pages, 8 figures, to appear in A&A
Online Primal-Dual Methods with Measurement Feedback for Time-Varying Convex Optimization
Creators: name: Bernstein, Andrey
name: Dall'Anese, Emiliano
name: Simonetto, Andrea
Publisher: name: arXiv
Year: 2018
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: This paper addresses the design and analysis of feedback-based online algorithms to control systems or networked systems based on performance objectives and engineering constraints that may evolve over time. The emerging time-varying convex optimization formalism is leveraged to model optimal operational trajectories of the systems, as well as explicit local and network-level operational constraints. Departing from existing batch and feed-forward optimization approaches, the design of the algorithms capitalizes on an online implementation of primal-dual projected-gradient methods; the gradient steps are, however, suitably modified to accommodate feedback from the system in the form of measurements - hence, the term "online optimization with feedback." By virtue of this approach, the resultant algorithms can cope with model mismatches in the algebraic representation of the system states and outputs, they avoid pervasive measurements of exogenous inputs, and they naturally lend themselves to a distributed implementation. Under suitable assumptions, analytical convergence claims are established in terms of dynamic regret. Furthermore, when the synthesis of the feedback-based online algorithms is based on a regularized Lagrangian function, Q-linear convergence to solutions of the time-varying optimization problem is shown.
description: Alphabetical order, authors contributed equally. Old title: Online Optimization with Feedback
title: Zuwanderungsmonitor Januar 2025
Creators: name: Brücker, Herbert
name: Hauptmann, Andreas
name: Keita, Keita
Publisher: name: Institut für Arbeitsmarkt- und Berufsforschung
Year: 2025
Subjects: Beschäftigungsquote
Arbeitslosenquote
Beschäftigungszuwachs

description: Die ausländische Bevölkerung in Deutschland ist nach Angaben des Ausländerzentralregisters im
Dezember 2024 um rund 8.000 Personen gegenüber November 2024 gestiegen. Im Vergleich zum
Vorjahresmonat ist die ausländische Bevölkerung um 1,2 Prozent gewachsen. Die Zahl von
Personen aus den EU-27 Staaten ist im Vorjahresvergleich um 1,2 Prozent gesunken. Die Zahl von
Personen aus den Asylherkunftsländern ist um 1,5 Prozent gestiegen, und die Zahl von
ukrainischen Staatsangehörigen ist um 7,6 Prozent gestiegen.
description: Zuwanderungsmonitor: Januar 2025, 2025-01
Weighted Sobolev estimates of the truncated Beurling operator
Creators: name: Pan, Yifei
name: Zhang, Yuan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: Primary 30E20, Secondary 42B37, 46E35

description: Given a bounded planar domain $D$ with $W^{k+1, \infty}$ boundary, $ k\in \mathbb Z^+$, and a weight $μ\in A_p, 1
description: 7 pages
Neutral and charged (pseduo)scalar mesons and diquarks under magnetic fields
Creators: name: Liu, Hao
name: Wang, Xinyang
name: Yu, Lang
name: Huang, Mei
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate both (pseudo)scalar mesons and diquarks in the presence of external magnetic field in the framework of the two-flavored Nambu--Jona-Lasinio (NJL) model, where mesons and diquarks are constructed by infinite sum of quark-loop chains by using random phase approximation. The polarization function of the quark-loop is calculated to the leading order of $1/N_c$ expansion by taking the quark propagator in the Landau level representation. We systematically investigate the masses behaviors of scalar $σ$ meson, neutral and charged pions as well as the scalar diquarks, with respect to the magnetic field strength at finite temperature and chemical potential. It is shown that the numerical results of both neutral and charged pions are consistent with the lattice QCD simulations. The mass of the charge neutral pion keeps almost a constant under the magnetic field, which is preserved by the remnant symmetry of QCD$\times$QED in the vacuum. The mass of the charge neutral scalar $σ$ is around two times quark mass and increases with the magnetic field due to the magnetic catalysis effect, which is an typical example showing that the polarized internal quark structure cannot be neglected when we consider the meson properties under magnetic field. For the charged particles, the one quark-antiquark loop contribution to the charged $π^{\pm}$ increases essentially with the increase of magnetic fields due to the magnetic catalysis of the polarized quarks. However, the one quark-quark loop contribution to the scalar diquark mass is negative comparing with the point-particle result and the loop effect is small.
description: 12 pages, 6 figures
On the Enhancement of Heat Transfer and Reduction of Entropy Generation by Asymmetric Slip in Pressure-Driven Non-Newtonian Microflows
Creators: name: Anand, Vishal
name: Christov, Ivan C.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We study hydrodynamics, heat transfer and entropy generation in pressure-driven microchannel flow of a power-law fluid. Specifically, we address the effect of asymmetry in the slip boundary condition at the channel walls. Constant, uniform but unequal heat fluxes are imposed at the walls in this thermally developed flow. The effect of asymmetric slip on the velocity profile, on the wall shear stress, on the temperature distribution, on the Bejan number profiles, and on the average entropy generation and the Nusselt number are established through the numerical evaluation of exact analytical expressions derived. Specifically, due to asymmetric slip, the fluid momentum flux and thermal energy flux are enhanced along the wall with larger slip, which in turn shifts the location of the velocity's maximum to an off-center location closer to the said wall. Asymmetric slip is also shown to redistribute the peaks and plateaus of the Bejan number profile across the microchannel, showing a sharp transition between entropy generation due to heat transfer and due to fluid flow at an off-center-line location. In the presence of asymmetric slip, the difference in the imposed heat fluxes leads to starkly different Bejan number profiles depending on which wall is hotter, and whether the fluid is shear-thinning or shear-thickening. Overall, slip is shown to promote uniformity in both the velocity field and the temperature field, thereby reducing irreversibility in this flow.
description: 15 pages, 11 figures; v2 accepted for publication in the ASME Journal of Heat Transfer; v3 corrects some typos
Building and analysing synthetic biological and GenoChemetic systems for accessing natural products and their analogues
Creators: name: Lawther, Hannah
Publisher: name: The University of St Andrews
Year: 2024
Subjects: GenoChemetics
Mass spectrometry
Natural products
Genome mining
Analytical chemistry
Liquid chromatography
Antibiotics
Cytochrome P450 epoxidase
Polyenes
Epoxidation

description: This thesis discusses a variety of synthetic biological approaches to advance the tools for the sustainable production and biosynthetic modification of natural products. Firstly, it outlines a pipeline for the discovery of cytochrome P450 epoxidases from genomic information. By building on work carried out by previous Goss group members, a series of known and putative cytochrome P540 epoxidases were assessed for activity against clinically relevant polyenes. These target enzymes were heterologously expressed and the bioreactions with the chosen substrates explored. These samples were assessed for substrate conversion and target product generation in a selection of heterologous hosts. Based on this, the most promising enzyme-host system for each substrate could be selected. It was also necessary to assess the potential for product generation at levels beyond an analytical scale and so scale-up conditions were considered. During this phase, protocols for purification of the epoxy-product were developed and product was purified. In addition to individual gene identification encoding cytochrome P450 epoxidases, the identification of two biosynthetic gene clusters was achieved through in silico experiments and in vitro exploration. Firstly, the BGC for marinomycin was heterologously expressed in a Streptomyces sp. host strain. The BGC for marinomycin is a large highly repetitive PKS cluster and so presented unique challenges, as recombination was highly likely when pursuing traditional cloning methods. The high levels of genetic repetition was investigated via bioinformatic analysis. By heterologous expression of a member of a BAC library, the production was enabled and the product was detected in negative mode via LC-MS analysis. Additionally, the BGC for another antibiotic, vD844, was identified and steps were taken towards the generation of a heterologous expression system. vD844 Was an interesting candidate for heterologous expression due to a chemically orthogonal handle, specifically an N-formyl group, being biosynthetically produced. Plasmids containing the whole BGC were generated from a cosmid library. Subsequent to the completion of work within this thesis, the heterologous production has been confirmed.
An explicit description of $SL(2,\mathbb{C})$ in terms of $SO^+(3,1)$ and vice versa
Creators: name: Klinker, Frank
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this note we present explicit and elementary formulas for the correspondence between the group of special Lorentz transformation $SO^+(3,1)$, on the one hand, and its spin group $SL(2,\mathbb{C})$, on the other hand. Although we will not mention Clifford algebra terminology explicitly, it is hidden in our calculations by using complex $2\times2$-matrices. Nevertheless, our calculations are strongly motivated by the Clifford algebra $\mathfrak{gl}(4,\mathbb{C})$ of four-dimensional space-time.
description: 13 pages
Thermoelectric performance of silicon with oxide nanoinclusions
Creators: name: D. Coleman
name: T. Lopez
name: S. Exarhos
name: M. Mecklenburg
name: S. Bux
name: L. Mangolini
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Biophysics
subject: Space Science
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine

description: Silicon nanoparticles produced via a plasma-based technique have been sintered into bulk nanostructured samples. These samples have micron-sized crystalline domains and contain well-dispersed oxide nanoinclusions. We have compared the thermoelectric performance of such structure to that of a control sample produced by sintering ball-milled silicon powders. The control sample has lower precipitate density and is composed of nanograins. Despite the stark difference in nanostructure, both samples have comparable thermal conductivity, and the sample with nanoinclusions has higher power factor and ZT. This result confirms that grain size engineering is not the only promising route to achieving improved thermoelectric performance. By controlling the feedstock powder processing technique, it is possible to obtain well-dispersed nanoinclusions in sintered bulk samples. These are as effective at reducing thermal transport properties as grain boundaries.
Strong Correlations and Fickian Water Diffusion in Narrow Carbon Nanotubes
Creators: name: Mukherjee, Biswaroop
name: Maiti, Prabal K.
name: Dasgupta, Chandan
name: Sood, A. K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We have used atomistic molecular dynamics (MD) simulations to study the structure and dynamics of water molecules inside an open ended carbon nanotube placed in a bath of water molecules. The size of the nanotube allows only a single file of water molecules inside the nanotube. The water molecules inside the nanotube show solid-like ordering at room temperature, which we quantify by calculating the pair correlation function. It is shown that even for the longest observation times, the mode of diffusion of the water molecules inside the nanotube is Fickian and not sub-diffusive. We also propose a one-dimensional random walk model for the diffusion of the water molecules inside the nanotube. We find good agreement between the mean-square displacements calculated from the random walk model and from MD simulations, thereby confirming that the water molecules undergo normal-mode diffusion inside the nanotube. We attribute this behavior to strong positional correlations that cause all the water molecules inside the nanotube to move collectively as a single object. The average residence time of the water molecules inside the nanotube is shown to scale quadratically with the nanotube length.
description: 23 pages, 5 figures