cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Lateral-torsional buckling fire design of stainless steel I beams under combined end moments and transverse loads
Creators: name: Lopes, Nuno
name: Couto, Carlos
name: Real, Paulo Vila
name: Camotim, Dinar
name: Gonçalves, Rodrigo
Publisher: name: figshare
Year: 2023
Subjects: Fire safety engineering
Structural engineering

description: New design expressions for stainless steel laterally unrestrained beams under fire conditions have recently been proposed to be incorporated in the second-generation version of Eurocode 3 (EC3) – however, their merit assessment, in the context of beams acted by different bending moment diagrams, is still a relevant issue requiring investigation. Hence, this work presents a numerical study on the lateral-torsional buckling resistance of stainless steel I-beams with slender or non-slender cross-sections, when acted by different combinations of end moments and transverse concentrated or distributed loads at elevated temperatures. The safety and accuracy of the failure moment predictions provided by the EC3 design approaches (current and second-generation version) are assessed through the comparison with extensive numerical failure moment data, obtained with the ANSYS software. It is shown that these methodologies can be improved, as they may lead to overly conservative or unsafe failure moment estimates.
A surprising consistency between the far-infrared galaxy luminosity functions of the field and Coma
Creators: name: Hickinbottom, S.
name: Simpson, C. J.
name: James, P. A.
name: Ibar, E.
name: Carter, D.
name: Boselli, A.
name: Collins, C. A.
name: Davies, J. I.
name: Dunne, L.
name: Eales, S.
name: Fuller, C.
name: Mobasher, B.
name: Peletier, R. F.
name: Phillipps, S.
name: Smith, D. J. B.
name: Smith, R. J.
name: Valentijn, E. A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present new deep images of the Coma Cluster from the ESA Herschel Space Observatory at wavelengths of 70, 100 and 160 microns, covering an area of 1.75 x 1.0 square degrees encompassing the core and southwest infall region. Our data display an excess of sources at flux densities above 100 mJy compared to blank-field surveys, as expected. We use extensive optical spectroscopy of this region to identify cluster members and hence produce cluster luminosity functions in all three photometric bands. We compare our results to the local field galaxy luminosity function, and the luminosity functions from the Herschel Virgo Cluster Survey (HeViCS). We find consistency between the shapes of the Coma and field galaxy luminosity functions at all three wavelengths, however we do not find the same level of agreement with that of the Virgo Cluster.
description: 8 pages, 5 figures, accepted for publication in the Monthly Notices of the Royal Astronomical Society
Karl G. Jansky Very Large Array observations of cold dust and molecular gas in starbursting quasar host galaxies at z~4.5
Creators: name: Wagg, J.
name: Carilli, C. L.
name: Aravena, M.
name: Cox, P.
name: Lentati, L.
name: Maiolino, R.
name: McMahon, R. G.
name: Riechers, D.
name: Walter, F.
name: Andreani, P.
name: Hills, R.
name: Wolfe, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present Karl G. Jansky Very Large Array (VLA) observations of 44 GHz continuum and CO J=2-1 line emission in BR1202-0725 at z=4.7 (a starburst galaxy and quasar pair) and BRI1335-0417 at z=4.4 (also hosting a quasar). With the full 8 GHz bandwidth capabilities of the upgraded VLA, we study the (rest-frame) 250 GHz thermal dust continuum emission for the first time along with the cold molecular gas traced by the Low-J CO line emission. The measured CO J=2-1 line luminosities of BR1202-0725 are L'(CO) = (8.7+/-0.8)x10^10 K km/s pc^2 and L'(CO) = (6.0+/-0.5)x10^10 K km/s pc^2 for the submm galaxy (SMG) and quasar, which are equal to previous measurements of the CO J=5-4 line luminosities implying thermalized line emission and we estimate a combined cold molecular gas mass of ~9x10^10 Msun. In BRI1335-0417 we measure L'(CO) = (7.3+/-0.6)x10^10 K km/s pc^2. We detect continuum emission in the SMG BR1202-0725 North (S(44GHz) = 51+/-6 microJy), while the quasar is detected with S(44GHz) = 24+/-6 microJy and in BRI1335-0417 we measure S(44GHz) = 40+/-7 microJy. Combining our continuum observations with previous data at (rest-frame) far-infrared and cm-wavelengths, we fit three component models in order to estimate the star-formation rates. This spectral energy distribution fitting suggests that the dominant contribution to the observed 44~GHz continuum is thermal dust emission, while either thermal free-free or synchrotron emission contributes less than 30%.
description: 16 pages , 4 figures. Accepted for publication in ApJ
Theory of ferromagnetic superconductors with spin-triplet electron pairing
Creators: name: Uzunov, Dimo I.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A general quasi-phenomenological theory that describes phases and phase transitions of ferromagnetic superconductors with spin-triplet electron Cooper pairing is presented. The theory is based on extended Ginzburg-Landau expansion in powers of superconducting and ferromagnetic order parameters. A simple form for the dependence of theory parameters on the pressure ensures a correct theoretical outline of the temperature-pressure phase diagram where a stable phase of coexistence of p-wave superconductivity and itinerant ferromagnetism appears. This new theory is in an excellent agreement with the experimental data for intermetallic compounds, for example, UGe2, URhGe, UCoGe, and UIr that are experimentally proven to be itinerant ferromagnets exhibiting spin-triplet superconductivity. The mechanism of appearance of superconductivity due to itinerant ferromagnetism ($M$-trigger effect) is established and demonstrated. On the basis of the same theory, basic features of quantum phase transitions in this type of ferromagnetic superconductors are explained in agreement with the experimental data. The theory allows for a classification of the spin-triplet ferromagnetic superconductors in two different types: type I and type II. The classification is based on quantitative criteria, i.e., on simple relations between theory parameters. Both theory and experiment indicate that the two types of p-wave ferromagnetic superconductors are well distinguished by essential differences in their physical properties.
description: Report at Physics Congress, Sofia, Sept 2013; to appear, in: Bulg.J.Phys. (2014)
Study on the Sustainable Development of Rural Landscape in the UK : Take the Cotswolds as an Example
Creators: name: XIE, Rongxing
name: ZHOU, Haoming
name: XIE, Rongxing
name: ZHOU, Haoming
Publisher: name: Unknown
Year: 2022
Subjects: subject: Agribusiness
subject: Rural landscape, UK, Sustainable development, Cotswolds

description: With the acceleration of globalization and urbanization, rural areas in China, particularly traditional villages have been faced with various problems and the development bottleneck. On the contrary, rural areas in the UK are well-known for picturesque scenery and outstanding characteristics, and able to maintain the sustainable vitality and charm in economy and culture, rural areas in the UK make successful examples for the global rural construction and development. This paper took Cotswolds in the UK for example, analyzed the maintenance and continuation of traditional rural landscapes in the UK from the perspectives of natural scenery, overall layout, folk dwellings, yard plants and so on. On the other hand, the paper explored the all-around sustainable development of rural landscapes in the UK from the perspectives of internal drives such as intangible cultural confidence, production mode, economic foundation and environmental protection. The study tried to provide references for the sustainable development of rural landscapes in China.
Long-term Variability in the Length of the Solar Cycle
Creators: name: Richards, Mercedes T.
name: Rogers, Michael L.
name: Richards, Donald St. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The recent paucity of sunspots and the delay in the expected start of Solar Cycle 24 have drawn attention to the challenges involved in predicting solar activity. Traditional models of the solar cycle usually require information about the starting time and rise time as well as the shape and amplitude of the cycle. With this tutorial, we investigate the variations in the length of the sunspot number cycle and examine whether the variability can be explained in terms of a secular pattern. We identified long-term cycles in archival data from 1610 - 2000 using median trace analyses of the cycle length and power spectrum analyses of the (O-C) residuals of the dates of sunspot minima and maxima. Median trace analyses of data spanning 385 years indicate a cycle length with a period of 183 - 243 years, and a power spectrum analysis identifies a period of 188 $\pm$ 38 years. We also find a correspondence between the times of historic minima and the length of the sunspot cycle, such that the cycle length increases during the time when the number of spots is at a minimum. In particular, the cycle length was growing during the Maunder Minimum when almost no sunspots were visible on the Sun. Our study suggests that the length of the sunspot number cycle should increase gradually, on average, over the next $\sim$75 years, accompanied by a gradual decrease in the number of sunspots. This information should be considered in cycle prediction models to provide better estimates of the starting time of each cycle.
description: 10 pages, 6 tables, 8 figures; published in PASP, 121, 797 - 809 (2009)
Infogram de relação de autores e palavras-chaves sobre indexação arquivistica
Creators: name: Lima, Vinícius
Publisher: name: Zenodo
Year: 2022
Subjects: Arquivologia no Brasil
indexação
Infographic

description: Se trata de um infografico de relação de autores e palavras-chaves sobre indexação, foram reunidos 25 artigos e documentos de diferentes bases de dados para compor o trabalho de tecnologia da informação 1 da UFPB, em seu infogram temos o uso das ferramentas zotera e Vosviwer para produzir a ilustração da pesquisa, e então reunidas junto de graficos no resultado final.
Subdomain-based exponential integrators for quantum Liouville-type equations
Creators: name: Schulz, Lukas
name: Inci, B.
name: Pech, M.
name: Schulz, Dirk
Publisher: name: TU Dortmund
Year: 2021
Subjects: subject: Computational nanotechnology
subject: Transient quantum transport
subject: Wigner transport equation
subject: Numerical methods
subject: Time integration techniques
subject: Exponential integrators
subject: 620
subject: Computational nanotechnology
subject: Wigner-Gleichung
subject: Numerisches Verfahren
subject: Von-Neumann-Gleichung
subject: Liouville-Gleichung
subject: Krylov-Verfahren

description: In order to describe quantum mechanical effects, the use of the von-Neumann equation is apparent. In this work, we present a unified numerical framework so that the von-Neumann equation in center-of-mass coordinates leads to a Quantum Liouville-type equation when choosing a suitable basis. In particular, the proposed approach can be related to the conventional Wigner equation when a plane wave basis is used. The drawback of the numerical methods is the high computational cost. Our presented approach is extended to allow reducing the dimension of the basis, which leads to a computationally efficient and accurate subdomain approach. Not only the steady-state behavior is of interest, but also the dynamic behavior. In order to solve the time-dependent case, suitable approximation methods for the time-dependent exponential integrator are necessary. For this purpose, we also investigate approximations of the exponential integrator based on Faber polynomials and Krylov methods. In order to evaluate and justify our approach, various test cases, including a resonant tunnel diode as well as a double-gate field-effect transistor, are investigated and validated for the stationary and the dynamic device behavior.
description: Journal of computational electronics;Vol. 20. 2022, Issue 6, pp 2070-2090
Complete-return spectrum for a generalized Rosen-Zener two-state term-crossing model
Creators: name: Shahverdyan, T. A.
name: Mogilevtsev, D. S.
name: Red'kov, V. M.
name: Ishkhanyan, A. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The general semiclassical time-dependent two-state problem is considered for a specific field configuration referred to as the generalized Rosen-Zener model. This is a rich family of pulse amplitude- and phase-modulation functions describing both non-crossing and term-crossing models with one or two crossing points. The model includes the original constant-detuning non-crossing Rosen-Zener model as a particular case. We show that the governing system of equations is reduced to a confluent Heun equation. When inspecting the conditions for returning the system to the initial state at the end of the interaction with the field, we reformulate the problem as an eigenvalue problem for the peak Rabi frequency and apply the Rayleigh-Schrödinger perturbation theory. Further, we develop a generalized approach for finding the higher-order approximations, which is applicable for the whole variation region of the involved input parameters of the system. We examine the general surface in the 3D space of input parameters, which defines the position of the n-th order return-resonance, and show that the section of the general surface is accurately approximated by an ellipse. We find a highly accurate analytic description through the zeros of a Kummer confluent hypergeometric function. From the point of view of the generality, the analytical description of mentioned curve for the whole variation range of all involved parameters is the main result of the present paper.
Position-dependent mechanical characterization of the PBF-EB-manufactured Ti6Al4V alloy
Creators: name: Kotzem, Daniel
name: Höffgen, Alexandra
name: Raveendran, Rajevan
Publisher: name: TU Dortmund
Year: 2021
Subjects: subject: Additive manufacturing
subject: Electron beam powder bed fusion (PBF-EB)
subject: Ti6Al4V
subject: Fatigue properties
subject: 660
subject: Rapid Prototyping
subject: Selektives Laserschmelzen
subject: Elektronenstrahlschmelzen
subject: TiAl6V4
subject: Materialermüdung

description: By means of additive manufacturing, the production of components with nearly unlimited geometrical design complexity is feasible. Especially, powder bed fusion techniques such as electron beam powder bed fusion (PBF-EB) are currently focused. However, equal material properties are mandatory to be able to transfer this technique to a wide scope of industrial applications. Within the scope of this work, the mechanical properties of the PBF-EB-manufactured Ti6Al4V alloy are investigated as a function of the position on the building platform. It can be stated that as-built surface roughness changes within building platform whereby highest surface roughness detected by computed tomography (Ra = 46.0 ± 5.3 µm) was found for specimens located in the front of the building platform. In contrast, no significant differences in relative density could be determined and specimens can be assumed as nearly fully dense (> 99.9%). Furthermore, all specimens are affected by an undersized effective diameter compared to the CAD data. Fatigue tests revealed that specimens in the front of the building platform show slightly lower performance at higher stress amplitudes as compared to specimens in the back of the building platform. However, process-induced notch-like defects based on the surface roughness were found to be the preferred location for early crack initiation.
description: Progress in additive manufacturing;Vol. 7. 2021, Issue 2, pp 249-260
Excitation temperature of the warm neutral medium as a new probe of the Lyman-α radiation field
Creators: name: Murray, Claire E.
name: Lindner, Robert R.
name: Stanimirovic, Snezana
name: Goss, W. M.
name: Heiles, Carl
name: Dickey, John
name: Pingel, Nickolas M.
name: Lawrence, Allen
name: Jencson, Jacob
name: Babler, Brian L.
name: Hennebelle, Patrick
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use the Karl G. Jansky Very Large Array (VLA) to conduct a high-sensitivity survey of neutral hydrogen (HI) absorption in the Milky Way. In combination with corresponding HI emission spectra obtained mostly with the Arecibo Observatory, we detect a widespread warm neutral medium (WNM) component with excitation temperature = 7200 (+1800,-1200) K (68% confidence). This temperature lies above theoretical predictions based on collisional excitation alone, implying that Ly-α scattering, the most probable additional source of excitation, is more important in the interstellar medium (ISM) than previously assumed. Our results demonstrate that HI absorption can be used to constrain the Ly-α radiation field, a critical quantity for studying the energy balance in the ISM and intergalactic medium yet notoriously difficult to model because of its complicated radiative transfer, in and around galaxies nearby and at high redshift.
description: 7 pages, 3 figures, 1 table. Accepted for publication in ApJ Letters
Comparing analytical and machine-learning-based design methods for slender section steel members in fire
Creators: name: Couto, Carlos
name: Tong, Qi
name: Gernay, Thomas
Publisher: name: figshare
Year: 2023
Subjects: Fire safety engineering
Structural engineering

description: In thin-walled steel members, the complexity of the interaction between the buckling of the plates and the buckling of the member, combined with the reduction of steel properties with increasing temperature, hinders the development of simple accurate analytical models. As a result, analytical design methods tend to be overly conservative for simple situations, and inexistent for more complex situations such as temperature gradients and systems-level response, leading to unreliable fire design methods and affecting the attractiveness of these structures that are designed with optimization in mind. Meanwhile, data-based approaches using Machine Learning (ML) techniques have allowed overcoming complex nonlinear problems in various engineering disciplines. ML may provide fast models surpassing existing analytical methods and achieving accuracy similar to Finite Element-based solutions at much lower computational cost. While the development of ML models requires sophisticated modelling and large datasets, which may not always be available, once a ML model is developed its application to practical design situations within the limits of its validity is straightforward. This paper investigates opportunities from application of ML methods to the problem of thin-walled steel members in fire, including critical comparison of benefits and capabilities between ML methods and existing analytical approaches. With a dataset of 2304 data points for columns and 24516 for beams, the paper shows that ML models can outperform current state-of-the-art analytical models in terms of agreement with high-fidelity shell FE results.
Four essays on firm size, Human Resource practices, and societal income inequality
Creators: name: Weißphal, Markus
Publisher: name: Universität Paderborn
Year: 2023

description: Diese kumulative Dissertation ergründet die Erklärungskraft von Personalpraktiken als neuen Grund für die gesellschaftliche Einkommensungleichheit. Dazu werden die theoretischen wie auch empirischen Zusammenhänge zwischen dem Einsatz bestimmter Personalpraktiken, den Belegschaftsgrößen von Unternehmen und der Entwicklung der gesellschaftlichen Einkommensungleichheit innerhalb von Ländern beleuchtet. Der erste Beitrag bildet einen neuen und umfassenden Literaturüberblick über die bisherigen theoretischen Ansichten und die diversen empirischen Befunde. Der zweite und dritte Beitrag untersuchen makroökonomische Länderdaten mittels einer moderierten Mediationsanalyse sowie einer Qualitative Comparative Analysis. Basierend auf Mikrodaten für deutsche Betriebe untersucht der vierte Beitrag die innerbetrieblichen Auswirkungen von Digitalisierung und Outsourcing auf die Arbeitsaufgaben und speziell das Ausmaß von Multitasking von Angestellten. Besonders durch die Überwindung verschiedener Schwierigkeiten im Zusammenspiel zwischen Theorieentwicklung und einer präzisen empirischen Operationalisierung zeigt die Dissertation deutliche Parallelen zwischen der Wahl der Personalpraktiken und dem Verlauf der gesellschaftlichen Einkommensungleichheit auf. Damit kann sie vor allem als konzeptionelle Grundlage dienen und künftige Forschung dabei unterstützen, robuste Effekte zu identifizieren, welche eine Formulierung gezielter praktischer Maßnahmen erlauben.
description: This dissertation explores the explanatory power of Human Resource practices as a new reason for societal income inequality. To this end, it highlights the theoretical as well as empirical relationships between the use of certain Human Resource practices, staff sizes of companies and the development of societal income inequality within countries. The first paper provides a new and encompassing literature overview of the previous theoretical views and the diverse empirical findings. The second and third paper analyse macroeconomic country data using moderated mediation analysis and Qualitative Comparative Analysis, respectively. Based on microdata for German establishments, the fourth paper examines the in-house effects of digitalisation and outsourcing on work tasks and specifically the extent of multitasking by employees. In particular, by overcoming several difficulties in the interplay between theory development and a precise empirical operationalisation, this dissertation reveals clear parallels between the choice of Human Resource practices and the trajectory of societal income inequality. Thereby, it can primarily serve as a conceptual foundation and help future research in identifying robust effects that allow the formulation of targeted practical measures.
Supplementary document for Efficiency Enhancement of Ultrathin CIGS Solar Cells by Optimal Bandgap Grading. Part II: New Algorithm and Double-layer Antireflection Coatings - 6100885.pdf
Creators: name: Ahmad, Faiz
name: Civiletti, Benjamin
name: Monk, Peter
name: Lakhtakia, Akhlesh
Publisher: name: Optica Publishing Group
Year: 2022
Subjects: Uncategorized

description: Supplementary Information
Intellectual Property Protection and High-quality Development of Cotton Industry in Xinjiang
Creators: name: XU, Miaomiao
name: HE, Yueqiu
name: XIONG, Wanzhen
name: SONG, Chengshun
name: SUN, Zhiguo
name: XU, Miaomiao
name: HE, Yueqiu
name: XIONG, Wanzhen
name: SONG, Chengshun
name: SUN, Zhiguo
Publisher: name: Unknown
Year: 2022
Subjects: subject: Agribusiness
subject: Xinjiang cotton incident, Protected zone for production of major high quality agricultural product cotton, Sense of community for the Chinese nation, Strategy of strengthening the country with intellectual property, High-quality development

description: This paper firstly introduces the general situation of cotton planting areas in China and cotton industry in Xinjiang, and the current situation of intellectual property protection of Xinjiang’s cotton industry. Then, it analyzes the main problems in its intellectual property protection and high-quality development. On this basis, it comes up with the recommendations for high-quality development of cotton industry in Xinjiang under the strategy of strengthening the country with intellectual property. The recommendations include improving the level of creation of creative intellectual property rights, building an intellectual property rule system in the entire cotton industry chain in Xinjiang, building protected zones for production of major high quality agricultural product cotton, establishing a demonstration zone to undertake the transfer of the domestic cotton textile and garment industry, undertaking education on the sense of community for the Chinese nation in response to the Xinjiang cotton incident, and developing the "Belt and Road" blue market for Xinjiang cotton and its products.
Cooperative Radar and Communications Signaling: The Estimation and Information Theory Odd Couple
Creators: name: Bliss, Daniel W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We investigate cooperative radar and communications signaling. While each system typically considers the other system a source of interference, by considering the radar and communications operations to be a single joint system, the performance of both systems can, under certain conditions, be improved by the existence of the other. As an initial demonstration, we focus on the radar as relay scenario and present an approach denoted multiuser detection radar (MUDR). A novel joint estimation and information theoretic bound formulation is constructed for a receiver that observes communications and radar return in the same frequency allocation. The joint performance bound is presented in terms of the communication rate and the estimation rate of the system.
description: 6 pages, 2 figures, to be presented at 2014 IEEE Radar Conference
Concluding talk: fundamental lessons and challenges from neutrinos
Creators: name: Altarelli, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a concise review of the experimental developments on neutrino mixing and their theoretical implications as presented and discussed at this Conference. The recent data disfavour many models but the surviving ones still span a wide range going from Anarchy (no structure, no symmetry in the neutrino sector) to a maximum of symmetry, as for the models based on discrete non-abelian flavour groups which can be improved following the indications from the recent data.
description: 20 pages, no figures. Talk given at the Pontecorvo 100 Symposium in honour of Bruno Pontecorvo for the centennial of the birth, Pisa, 18-20 September 2013. arXiv admin note: text overlap with arXiv:1304.5047, arXiv:1111.6421, arXiv:1210.3467
Direct observation of the leakage current in epitaxial diamond Schottky barrier devices by conductive-probe atomic force microscopy and Raman imaging
Creators: name: Alvarez, Jose
name: Boutchich, M.
name: Kleider, J. P.
name: Teraji, T.
name: Koide, Y.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The origin of the high leakage current measured in several vertical-type diamond Schottky devices is conjointly investigated by conducting probe atomic force microscopy (CP-AFM) and confocal micro-Raman/Photoluminescence (PL) imaging analysis. Local areas characterized by a strong decrease of the local resistance (5-6 orders of magnitude drop) with respect to their close surrounding have been identified in several different regions of the sample surface. The same local areas, also referenced as electrical hot-spots, reveal a slightly constrained diamond lattice and three dominant Raman bands in the low-wavenumber region (590, 914 and 1040 cm-1). These latter bands are usually assigned to the vibrational modes involving boron impurities and its possible complexes that can electrically act as traps for charge carriers. Local current-voltage measurements performed at the hot-spots point out a trap-filled-limited (TFL) current as the main conduction mechanism favoring the leakage current in the Schottky devices.
New Red Jewels in Coma Berenices
Creators: name: Terrien, Ryan C.
name: Mahadevan, Suvrath
name: Deshpande, Rohit
name: Bender, Chad F.
name: Cargile, Phillip A.
name: Hearty, Frederick R.
name: Cottaar, Michiel
name: Prieto, Carlos Allende
name: Fleming, Scott W.
name: Frinchaboy, Peter M.
name: Jackson, Kelly M.
name: Johnson, Jennifer A.
name: Majewski, Steven R.
name: Nidever, David L.
name: Pepper, Joshua
name: Rodriguez, Joseph E.
name: Schneider, Donald P.
name: Siverd, Robert J.
name: Stassun, Keivan G.
name: Weaver, Benjamin A.
name: Wilson, John C.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have used Sloan Digital Sky Survey-III (SDSS-III) Apache Point Observatory Galactic Evolution Experiment (APOGEE) radial velocity observations in the near-infrared $H$-band to explore the membership of the nearby ($86.7 \pm 0.9$ pc) open cluster Coma Berenices (Melotte 111), concentrating on the poorly-populated low-mass end of the main sequence. Using SDSS-III APOGEE radial velocity measurements, we confirm the membership of eight K/M dwarf members, providing the first confirmed low-mass members of the Coma Berenices cluster. Using $R\sim2000$ spectra from IRTF-SpeX, we confirm the independently luminosity classes of these targets, and find their metallicities to be consistent with the known solar mean metallicity of Coma Berenices and of M dwarfs in the Solar neighborhood. In addition, the APOGEE spectra have enabled measurement of $v\sin i$ for each target and detection for the first time of the low-mass secondary components of the known binary systems Melotte 111 102 and Melotte 111 120, as well as identification of the previously unknown binary system 2MASS J12214070+2707510. Finally, we use Kilodegree Extremely Little Telescope (KELT) photometry to measure photometric variability and rotation periods for a subset of the Coma Berenices members.
description: 13 pages, 10 figures, accepted to ApJ
Mit Grundschulen ins FabLab
Creators: name: Coers, Linya
name: Dittbrenner, Elisa
Publisher: name: Universität Bremen
Year: 2023
Subjects: subject: FabLabs
subject: Making
subject: Grundschule
subject: Bildung
subject: Kooperation
subject: 370

description: Ausgehend von forschungsbasierten Erfahrungen der Kooperation zwischen Grundschule und FabLab wurden für verschiedene Zielgruppen Handreichungen entwickelt, die den Einstieg in gemeinsame Projekte erleichtern sollen. Diese Handreichung richtet sich an Grundschullehrer*innen, die mit ihrer Klasse ein FabLab besuchen möchten.
Grundschüler*innen in deinem FabLab
Creators: name: Coers, Linya
name: Dittbrenner, Eisa
Publisher: name: Universität Bremen
Year: 2023
Subjects: subject: FabLabs
subject: Making
subject: Grundschule
subject: Bildung
subject: Kooperation
subject: 370

description: Ausgehend von forschungsbasierten Erfahrungen der Kooperation zwischen Grundschule und FabLab wurden für verschiedene Zielgruppen Handreichungen entwickelt, die den Einstieg in gemeinsame Projekte erleichtern sollen. Diese Handreichung richtet sich an FabLabs, die eine Kooperation mit Grundschulen aufbauen wollen.
Synchronized Switching in a Josephson Junction Crystal
Creators: name: Leib, Martin
name: Hartmann, Michael J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider a superconducting coplanar waveguide resonator where the central conductor is interrupted by a series of uniformly spaced Josephson junctions. The device forms an extended medium that is optically nonlinear on the single photon level with normal modes that inherit the full nonlinearity of the junctions but are nonetheless accessible via the resonator ports. For specific plasma frequencies of the junctions a set of normal modes clusters in a narrow band and eventually become entirely degenerate. Upon increasing the intensity of a red detuned drive on these modes, we observe a sharp and synchronized switching from low occupation quantum states to high occupation classical fields, accompanied by a pronounced jump from low to high output intensity.
description: 13 pages, 5 figures
title: The implementation of pharmacogenetics: evidence and preferences
Creators: name: Johnson, Danielle
Publisher: name: University of Liverpool Repository
Year: 2022

description: Pharmacogenetics has huge potential to transform the field of medicine and deliver personalised treatments to patients. However, its wider use is limited by many factors, particularly a lack of suitable evidence of efficacy or safety for regulatory approval and clinical use. The evidence required can be difficult to ascertain, presenting three main problems. The first issue is that regulatory guidance for the evidence required is complex and varies greatly between different authorities and contexts. Guidance from the UK Medicines and Healthcare products Regulatory Authority (MHRA) and the US Food and Drug Administration (FDA) was reviewed along with criteria formulated by other industry and academic groups. It was found that there is a clear need for a unified set of standards for evidence gathering in pharmacogenetics. This was strengthened by an analysis of the evidence used by five different randomised controlled trials to justify the inclusion of their pharmacogenetic biomarker. Large variation in the quality and type of this evidence was found. These findings were used to make recommendations for future evidence gathering for trials, regulators, and journals. Additionally, the evidence required for clinical implementation has traditionally been the prospective randomised controlled trial. Gathering information from two novel systematic reviews and meta-analyses of carbamazepine-induced Stevens-Johnson syndrome, it was shown how these sources of observational evidence can produce effect estimates and measures of clinical validity of greater precision than that of a prospective trial. Finally, the level of evidence for a pharmacogenetic test that would be acceptable to the general public is not known. A discrete choice experiment (DCE) was designed to quantify these views. The first step was a systematic review of existing DCEs in this area, to extract useful information from these to inform the work. An extensive programme of qualitative work with healthcare professionals, patients, and the general public then further informed the design of this novel DCE. Participants were randomised to complete one of eight DCEs in different disease areas, with either a ‘high’ evidence scenario or a ‘low’ evidence scenario described. Launched in May 2021, over 2,000 responses were collected and the results were analysed in preference-weighted utility models. Although there was no difference in utility between ‘high’ and ‘low’ evidence tests, several important insights were generated (particularly in regard to data sharing and privacy) that will potentially have large impacts on policy in this area.
Rummaging inside the Eskimo's parka: Variable asymmetric PN fast wind and a binary nucleus?
Creators: name: Prinja, Raman
name: Urbaneja, Miguel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report on high-resolution optical time-series spectroscopy of the central star of the `Eskimo' planetary nebula NGC~2392. Datasets were secured with the ESO 2.3m in 2006 March and CFHT 3.6m in 2010 March to diagnose the fast wind and photospheric properties of the central star. The HeI and HeII recombination lines reveal evidence for clumping and temporal structures in the fast wind that are erratically variable on timescales down to ~ 30 min. (i.e. comparable to the characteristic wind flow time). We highlight changes in the overall morphology of the wind lines that cannot plausibly be explained by line-synthesis model predictions with a spherically homogeneous wind. Additionally we present evidence that the UV line profile morphologies support the notion of a high-speed, high-ionization polar wind in NGC~2392. Analyses of deep-seated, near-photospheric absorption lines reveals evidence for low-amplitude radial velocity shifts. Fourier analysis points tentatively to a ~ 0.12-d modulation in the radial velocities, independently evident in the ESO and CFHT data. We conclude that the overall spectroscopic properties support the notion of a (high inclination) binary nucleus in NGC~2392 and an asymmetric fast wind.
description: MNRAS in press; 9 pages; 9 figures
Unterstützungsangebote im bremischen Berufsausbildungssystem
Creators: name: Anslinger, Eva
name: Kroeger, TImm
name: Meng, Frank
name: Müntinga, Ruth
name: Stephan, Jakob
Publisher: name: Arbeitnehmerkammer Bremen
Year: 2023
Subjects: subject: Bedarfsanalyse
subject: Unterstützung
subject: Berufsausbildung
subject: 370

description: Mit der Studie wird eine Bedarfsanalyse vorgelegt, mit deren Hilfe ein breites und gut erreichbares Bertatungs- und Unterstützungsangebot an den spezifischen Bedarfen junger Menschen in der Berufsausbildung ausgerichtet werden kann.
title: What is ‘Lad Culture’ and How Are Universities Responding to it?: A Case Study of Two UK Higher Education Institutions
Creators: name: Kendrick, Alexandra
Publisher: name: University of Liverpool Repository
Year: 2022

description: Drawing on qualitative data collected between 2018 – 2020 with students and staff at two case study Higher Education Institutions (HEIs) in the North West of England, this thesis is concerned with what lad culture means to students at the two case study HEIs, and how this manifests across online and offline spaces. This research highlights how these cultures are not only present within student nightlife spaces or sports clubs, but also within classrooms, on field trips, and on social media. Focusing on the ways in which gender intersects with class, race and sexuality in the context of student lad cultures, this thesis explores how lad cultures within UK HEIs manifest through small, everyday peer-to-peer interactions. In doing so, this thesis complicates previous understandings of student lad culture, bringing nuance to recent debates in presenting lad cultures and laddism as a form of student identity that is nuanced and not monolithic. This thesis also pays attention to the responses of the two case study HEIs to lad culture, harassment and sexual misconduct, through both staff interviews and students’ accounts of the institutional complaints system(s). Within this, a number of key areas are identified for the two case study institutions, in order to improve their responses to these issues.
Closed String Amplitudes as Single-Valued Open String Amplitudes
Creators: name: Stieberger, Stephan
name: Taylor, Tomasz R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Number Theory (math.NT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We show that the single trace heterotic N-point tree-level gauge amplitude A_HET can be obtained from the corresponding type I amplitude A_I by the single-valued (sv) projection: A_HET=sv(A_I). This projection maps multiple zeta values to single-valued multiple zeta values. The latter represent a subclass of multiple zeta values originating from single-valued multiple polylogarithms at unity. Similar relations between open and closed string amplitudes or amplitudes of different string vacua can be established. As a consequence the alpha'-expansion of a closed string amplitude is dictated by that of the corresponding open string amplitude. The combination of single-valued projections, Kawai-Lewellen-Tye relations and Mellin correspondence reveal a unity of all tree-level open and closed superstring amplitudes together with the maximally supersymmetric Yang-Mills and supergravity theories.
description: 25 pages, harvmac
A Survey on Spatial Co-location Patterns Discovery from Spatial Datasets
Creators: name: Zala, Mr. Rushirajsinh L.
name: Mehta, Mr. Brijesh B.
name: Zala, Mr. Mahipalsinh R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Spatial data mining or Knowledge discovery in spatial database is the extraction of implicit knowledge, spatial relations and spatial patterns that are not explicitly stored in databases. Co-location patterns discovery is the process of finding the subsets of features that are frequently located together in the same geographic area. In this paper, we discuss the different approaches like Rule based approach, Join-less approach, Partial Join approach and Constraint neighborhood based approach for finding co-location patterns.
description: 6 pages,8 figures
Gesundheitswirtschaft in Bremen - Befunde und Perspektiven
Creators: name: Becka, Denise
name: Evans, Michaela
name: Hilbert, Josef
name: Merkel, Sebastian
name: Schmidt, Christopher
Publisher: name: Arbeitnehmerkammer Bremen
Year: 2018
Subjects: subject: 330

description: Die Gesundheitswirtschaft gilt als dynamischer Wachstumsbereich mit hoher volkswirtschaftlicher und beschäftigungspolitischer Bedeutung. Bundesweit arbeiten hier nahezu sieben Millionen Menschen, etwa in der Pflege, in Krankenhäusern, in Haus- und Facharztpraxen, in der Medizintechnik, oder pharmazeutischen Industrie. Ihr Anteil am Bruttosozialprodukt liegt bei rund zwölf Prozent. Auch im Land Bremen ist die Gesundheitswirtschaft mit mehr als 60.000 Beschäftigten ein relevanter wirtschaftlicher und arbeitsmarktpolitischer Faktor. Viele Angebote der Gesundheitswirtschaft sind gesellschaftlich notwendige Dienstleistungen, die nicht nur die medizinische Versorgung gewährleisten, sondern auch gesellschaftliche Teilhabe ermöglichen. Darüber hinaus gelten Medizintechnik, Biotechnologie und Life-Sciences als innovations- und investitionsrelevante Geschäftsfelder. Mit der vorliegenden Studie wollen wir eine Diskussion um die regionalwirtschaftliche Bedeutung der Gesundheitswirtschaft und mögliche Weiterentwicklungen im Land Bremen initiieren.
title: Beiträge zur Entwicklung numerischer Verfahren zur Simulation der Exposition von Menschen gegenüber elektromagnetischen Feldern
Creators: name: Zang, Martin
Publisher: name: Bergische Universität Wuppertal
Year: 2020

description: Bei der Exposition von Personen durch elektromagnetische Felder verschiedener technischer Quellen können Wechselwirkungen der Felder mit dem biologischen Gewebe erfolgen, die zu gesundheitlichen Schädigungen führen können. Im Rahmen der Forschungsarbeiten innerhalb dieser Dissertation wurden vier numerische, computergestützte Rechenverfahren entwickelt, mit denen die Exposition von Menschen gegenüber niederfrequenten (NF) Magnetfeldern, hochfrequenten (HF) elektromagnetischen Antennenfeldern sowie Feldern mit Frequenzen im THz-Frequenzbereich bestimmt werden kann. Die Entwicklung dieser Verfahren war durch verschiedene realistische Expositionsszenarien motiviert: Körperexpositionen durch NF-Felder induktiver Ladesysteme von (hybrid-)elektrischen Fahrzeugen, Expositionen durch HF-Felder fahrzeuggebundener Antennen sowie durch Strahlungsfelder im THz-Frequenzbereich in Sicherheitsscannern. Die Bestimmung der Exposition mit den entwickelten Verfahren zielt auf die Expositionsbewertung hinsichtlich von der International Commission on Non-Ionizing Radiation Protection (ICNIRP) empfohlener Grenzwerte hin, deren Einhaltung wissenschaftlich anerkannte schädliche Wirkungen verhindern soll.
 In der Dissertationsschrift werden die zuvor erwähnten Simulationsverfahren für die elektromagnetische Körperexposition beschrieben. Für die Expositionssimulationen benötigte numerische Modelle der Gewebeverteilungen im menschlichen Körper (Ganzkörpermodelle für Simulationen im NF- und HF-Frequenzbereich, ein Teilkörper-Modell der Haut für Simulationen im THz-Frequenzbereich) werden präsentiert. Für Simulationen mancher Expositionsszenarien ist die Verfügbarkeit von Ganzkörpermodellen mit unterschiedlichen Körperhaltungen erforderlich. Es wird zusätzlich ein Verfahren vorgestellt, mit dem aus einem Referenz-Körpermodell einer stehenden Person Ganzkörpermodelle mit verschiedenen Körperhaltungen generiert werden können. Für jeden der betrachteten Frequenzbereiche werden unter Verwendung der gezeigten numerischen Verfahren berechnete Expositionen in realistischen Szenarien präsentiert und hinsichtlich der ICNIRP-Grenzwerte bewertet.
Reflections on the High-quality Development of Rural Areas in Guangshan County, Xinyang City
Creators: name: XIA, Tingting
name: GU, Minghua
name: LIANG, Jie
name: LIU, Yongxian
name: NONG, Mengling
name: XIONG, Zhiyue
name: ZHOU, Wei
name: LI, Xinsheng
name: LI, Yimiao
name: HE, Lishan
name: XIA, Tingting
name: GU, Minghua
name: LIANG, Jie
name: LIU, Yongxian
name: NONG, Mengling
name: XIONG, Zhiyue
name: ZHOU, Wei
name: LI, Xinsheng
name: LI, Yimiao
name: HE, Lishan
Publisher: name: Unknown
Year: 2022
Subjects: subject: Agribusiness
subject: Guangshan County, Agricultural talents, Rural industrial structure, High-quality development of rural areas

description: The problems faced by the development of Guangshan County were analyzed from the aspects of rural management talents, industrial structure, e-commerce development, and farmers' ideology, and corresponding solutions were proposed to improve the development speed of rural areas in the county and promote the high-quality development of the county as a whole.
Projecto "A minha praia": cidadania ambiental para sensibilização, monitorização e limpeza do lixo marinho na região do Algarve
Creators: name: Ramos, Ana A
name: Lourenço, Carla
name: Afonso, João
name: Freitas, Ricardo
name: Veiga-Pires, Cristina
name: Reis, Emanuel
name: Rodrigues, Miguel
name: Gomes, Tiago
name: Rodrigues, Luís
name: Mira, Sara
name: Leote, Catarina
name: Ferreira, Hélder
name: Pinto, Andreia
name: Vaz, Paula
name: Drago, Teresa
name: Borges, Rita
Publisher: name: Zenodo
Year: 2018
Subjects: OPP 2017, A minha praia, lixo marinho, poluição por plásticos

description: O projecto “A minha praia”, um dos vencedores do Orçamento Participativo OPP – Ciência 2017 pretende contribuir para a conservação do meio marinho e desenvolvimento sustentável com a criação de uma rede alargada de monitorização de lixo marinho ao longo da costa Algarvia. Através da cooperação de diferentes intervenientes (Centros Ciência Viva, comunidade escolar, Investigadores, municípios e entidades regionais) serão promovidas acções de ciência cidadã de: 1) limpeza e monitorização do lixo marinho de seis praias referenciadas da região; 2) actividades educativas de reutilização e reciclagem de materiais de plástico recolhidos em estações de reciclagem implementadas nos Centros Ciência Viva. Para além da obtenção de informação relevante para avaliação do lixo marinho encontrado nas praias (e.g. origem, quantidade, variação anual) este projecto irá contribuir para a sensibilização da sociedade e em particular da comunidade escolar para a problemática e impacto da poluição do meio marinho, nomeadamente por plásticos, nos ecossistemas e nos serviços por eles fornecidos e para a necessidade de um consumo sustentável e preservação dos Oceanos. Adicionalmente, contribuirá para a aproximação entre os cidadãos e a comunidade científica.
description: SFRH/BGCT/127909/2016; SFRH/BGCT/135195/2017