cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Geschlossen untergebrachte Jugendliche : Ausgangssituation, Ziele, Verläufe und Ergebnisse von Hilfeplanungen und deren Umsetzung
Creators: name: Sülzle-Temme, Kirsten
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Geschlossene Unterbringung
subject: Hilfeplanung
subject: Evaluation
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::360 | Soziale Probleme, Sozialdienste, Versicherungen

description: [no abstract]
title: Stochastic Galerkin Reduced Basis Methods for Parametrized Linear Convection−Diffusion−Reaction Equations
Creators: name: Ullmann, Sebastian
name: Müller, Christopher
name: Lang, Jens
Publisher: name: MDPI
Year: 2023

description: We consider the estimation of parameter-dependent statistics of functional outputs of steady-state convection–diffusion–reaction equations with parametrized random and deterministic inputs in the framework of linear elliptic partial differential equations. For a given value of the deterministic parameter, a stochastic Galerkin finite element (SGFE) method can estimate the statistical moments of interest of a linear output at the cost of solving a single, large, block-structured linear system of equations. We propose a stochastic Galerkin reduced basis (SGRB) method as a means to lower the computational burden when statistical outputs are required for a large number of deterministic parameter queries. Our working assumption is that we have access to the computational resources necessary to set up such a reduced-order model for a spatial-stochastic weak formulation of the parameter-dependent model equations. In this scenario, the complexity of evaluating the SGRB model for a new value of the deterministic parameter only depends on the reduced dimension. To derive an SGRB model, we project the spatial-stochastic weak solution of a parameter-dependent SGFE model onto a reduced basis generated by a proper orthogonal decomposition (POD) of snapshots of SGFE solutions at representative values of the parameter. We propose residual-corrected estimates of the parameter-dependent expectation and variance of linear functional outputs and provide respective computable error bounds. We test the SGRB method numerically for a convection–diffusion–reaction problem, choosing the convective velocity as a deterministic parameter and the parametrized reactivity or diffusivity field as a random input. Compared to a standard reduced basis model embedded in a Monte Carlo sampling procedure, the SGRB model requires a similar number of reduced basis functions to meet a given tolerance requirement. However, only a single run of the SGRB model suffices to estimate a statistical output for a new deterministic parameter value, while the standard reduced basis model must be solved for each Monte Carlo sample.
UV-Licht induzierte Proteine aus Nidula niveo-tomentosa
Creators: name: Taupp, Daniela
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Basidiomycet
subject: UV-Licht
subject: Proteine
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: [no abstract]
Performance of Vehicle-to-Vehicle Communication using IEEE 802.11p in Vehicular Ad-hoc Network Environment
Creators: name: Khairnar, Vaishali D.
name: Kotecha, Ketan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Traffic safety applications using vehicle-to-vehicle (V2V) communication is an emerging and promising area within the ITS environment. Many of these applications require real-time communication with high reliability. To meet a real-time deadline, timely and predictable access to the channel is paramount. The medium access method used in 802.11p, CSMA with collision avoidance, does not guarantee channel access before a finite deadline. The well-known property of CSMA is undesirable for critical communications scenarios. The simulation results reveal that a specific vehicle is forced to drop over 80% of its packets because no channel access was possible before the next message was generated. To overcome this problem, we propose to use STDMA for real-time data traffic between vehicles. The real- time properties of STDMA are investigated by means of the highway road simulation scenario, with promising results.
description: 28 pages, 18 figures, International Journal of Network Security & Its Applications, International Journal of Network Security & Its Applications (IJNSA), Vol.5, No.2, March 2013
Algoritmos genéticos para aprendizaje de perfiles de usuario
Creators: name: Stepanoski, Mauro
name: Macchi, José
Publisher: name: figshare
Year: 2020
Subjects: subject: 170203 Knowledge Representation and Machine Learning
subject: FOS: Psychology

description: En la actualidad las exigencias de las personas ponen cada vez más de manifiesto la necesidad de eficiencia y aprovechamiento del tiempo en cada una de las tareas que realizan. Es así como comienzan a surgir en el ámbito computacional, asistentes que ayudan a optimizar tareas, desde la simple compra en un sitio de comercio electrónico hasta la búsqueda de información precisa o la construcción de una agenda, entre otras tantas. Estos asistentes son entidades autónomas, que realizan tareas a favor de un usuario o comunidad de usuarios, llamados comúnmente agentes inteligentes. Para asistir a un usuario, cada agente crea un perfil, el cual es utilizado como base de conocimiento en sus tareas de asistencia. Los agentes hacen uso de técnicas de Inteligencia Artificial para dar forma al proceso de construcción de los distintos perfiles de usuario. El presente trabajo se enfoca en el estudio de una técnica particular para su utilización en la generación de perfiles de usuarios en los dominios de recuperación de información en la Web, de comercio electrónico y de una agenda personal; esta técnica se conoce como algoritmos genéticos, la cual básicamente consiste en la aplicación de conceptos tales como evolución, selección natural, cruzamiento, mutación así como cualquier otro tipo de transformación propia del campo de la genética para la resolución de problemas en el ámbito computacional. La selección de esta técnica en particular se debe fundamentalmente a su conocido buen desempeño en otras áreas y a su potencial facilidad para adaptar los perfiles resultantes a los intereses cambiantes de los usuarios a través del tiempo. El objetivo fundamental de este trabajo es el de determinar, mediante un análisis comparativo de la aplicación de la técnica en los dominios mencionados, cuáles son las características más relevantes de su uso en diferentes áreas, verificar que la técnica es realmente útil para el desarrollo de perfiles de usuarios, encontrar variantes que sugieran nuevos enfoques en su estudio y constatar la posibilidad de su utilización en sistemas de aplicación real, en donde las exigencias en términos de recursos de procesamiento, espacio y usabilidad son esenciales para la aceptación por parte de los usuarios.
Messen des Stofftransports durch die Phasengrenze zweier nicht mischbarer Flüssigkeiten
Creators: name: Wothe, Daniel
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Stofftransport
subject: Phasengrenze
subject: konfokale Zwei-Photonen-Fluoreszenztechnik
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: [no abstract]
Performance Comparison of Optimal Fractional Order Hybrid Fuzzy PID Controllers for Handling Oscillatory Fractional Order Processes with Dead Time
Creators: name: Das, Saptarshi
name: Pan, Indranil
name: Das, Shantanu
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Fuzzy logic based PID controllers have been studied in this paper, considering several combinations of hybrid controllers by grouping the proportional, integral and derivative actions with fuzzy inferencing in different forms. Fractional order (FO) rate of error signal and FO integral of control signal have been used in the design of a family of decomposed hybrid FO fuzzy PID controllers. The input and output scaling factors (SF) along with the integro-differential operators are tuned with real coded genetic algorithm (GA) to produce optimum closed loop performance by simultaneous consideration of the control loop error index and the control signal. Three different classes of fractional order oscillatory processes with various levels of relative dominance between time constant and time delay have been used to test the comparative merits of the proposed family of hybrid fractional order fuzzy PID controllers. Performance comparison of the different FO fuzzy PID controller structures has been done in terms of optimal set-point tracking, load disturbance rejection and minimal variation of manipulated variable or smaller actuator requirement etc. In addition, multi-objective Non-dominated Sorting Genetic Algorithm (NSGA-II) has been used to study the Pareto optimal trade-offs between the set point tracking and control signal, and the set point tracking and load disturbance performance for each of the controller structure to handle the three different types of processes.
description: 31 pages, 20 figures
Transformation der Energiesysteme : Ein kompakter Überblick zur Energieforschung an der Leibniz Universität Hannover
Creators: name: Hanke-Rauschenbach, Richard
name: Schöber, Volker
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2022
Subjects: subject: Energieversorgung
subject: Transformation
subject: Erneuerbare Energien
subject: Energiewende
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft::333 | Boden- und Energiewirtschaft::333,7 | Natürliche Ressourcen, Energie und Umwelt

description: [no abstract available]
Single-Pass GPU-Raycasting for Structured Adaptive Mesh Refinement Data
Creators: name: Kaehler, Ralf
name: Abel, Tom
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Graphics (cs.GR)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Structured Adaptive Mesh Refinement (SAMR) is a popular numerical technique to study processes with high spatial and temporal dynamic range. It reduces computational requirements by adapting the lattice on which the underlying differential equations are solved to most efficiently represent the solution. Particularly in astrophysics and cosmology such simulations now can capture spatial scales ten orders of magnitude apart and more. The irregular locations and extensions of the refined regions in the SAMR scheme and the fact that different resolution levels partially overlap, poses a challenge for GPU-based direct volume rendering methods. kD-trees have proven to be advantageous to subdivide the data domain into non-overlapping blocks of equally sized cells, optimal for the texture units of current graphics hardware, but previous GPU-supported raycasting approaches for SAMR data using this data structure required a separate rendering pass for each node, preventing the application of many advanced lighting schemes that require simultaneous access to more than one block of cells. In this paper we present a single-pass GPU-raycasting algorithm for SAMR data that is based on a kD-tree. The tree is efficiently encoded by a set of 3D-textures, which allows to adaptively sample complete rays entirely on the GPU without any CPU interaction. We discuss two different data storage strategies to access the grid data on the GPU and apply them to several datasets to prove the benefits of the proposed method.
description: 12 pages, 7 figures. submitted to Visualization and Data Analysis 2013
Kriechverhalten von Salzgestein in der Umgebung von Kavernenfeldern
Creators: name: Zander-Schiebenhöfer, Dirk
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Kavernenfelder
subject: Salzgestein
subject: Kriechverhalten
subject: In-situ-Beobachtungen
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: [no abstract]
Formation of Dense Molecular Gas and Stars at the Circumnuclear Starburst Ring in the Barred Galaxy NGC 7552
Creators: name: Pan, Hsi-An
name: Lim, Jeremy
name: Matsushita, Satoki
name: Wong, Tony
name: Ryder, Stuart
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present millimeter molecular-line complemented by optical observations, along with a reanalysis of archival centimeter HI and continuum data, to infer the global dynamics and determine where dense molecular gas and massive stars preferentially form in the circumnuclear starburst ring of the barred-spiral galaxy NGC 7552. We find diffuse molecular gas in a pair of dust lanes each running along the large-scale galactic bar, as well as in the circumnuclear starburst ring. We do not detect dense molecular gas in the dust lanes, but find such gas concentrated in two knots where the dust lanes make contact with the circumnuclear starburst ring. When convolved to the same angular resolution as the images in dense gas, the radio continuum emission of the circumnuclear starburst ring also exhibits two knots, each lying downstream of an adjacent knot in dense gas. The results agree qualitatively with the idea that massive stars form from dense gas at the contact points, where diffuse gas is channeled into the ring along the dust lanes, and later explode as supernovae downstream of the contact points. Based on the inferred rotation curve, however, the propagation time between the respective pairs of dense gas and centimeter continuum knots is about an order of magnitude shorter than the lifetimes of OB stars. We discuss possible reasons of this discrepancy, and conclude that either the initial mass function is top-heavy or massive stars in the ring do not form exclusively at the contact points where dense molecular gas is concentrated.
description: 32 pages, 18 figures, Accepted for publication in the Astrophysical Journal
Design of Hybrid Regrouping PSO-GA based Sub-optimal Networked Control System with Random Packet Losses
Creators: name: Pan, Indranil
name: Das, Saptarshi
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, a new approach has been presented to design sub-optimal state feedback regulators over Networked Control Systems (NCS) with random packet losses. The optimal regulator gains, producing guaranteed stability are designed with the nominal discrete time model of a plant using Lyapunov technique which produces a few set of Bilinear Matrix Inequalities (BMIs). In order to reduce the computational complexity of the BMIs, a Genetic Algorithm (GA) based approach coupled with the standard interior point methods for LMIs has been adopted. A Regrouping Particle Swarm Optimization (RegPSO) based method is then employed to optimally choose the weighting matrices for the state feedback regulator design that gets passed through the GA based stability checking criteria i.e. the BMIs. This hybrid optimization methodology put forward in this paper not only reduces the computational difficulty of the feasibility checking condition for optimum stabilizing gain selection but also minimizes other time domain performance criteria like expected value of the set-point tracking error with optimum weight selection based LQR design for the nominal system.
description: 27 pages, 7 figures
Picturing The Invisible: Stories
Creators: name: Coldwell, Paul
name: Morgan, Ruth
Publisher: name: University of the Arts London
Year: 2023
Subjects: Design practice and methods
Art theory
Architecture not elsewhere classified
Digital curation and preservation
British and Irish literature
Forensic science and management
Textile and fashion design
Medical ethics
Psychiatry (incl. psychotherapy)
Philosophy of mind (excl. cognition)
High energy astrophysics and galactic cosmic rays

description: Stories archived from the Picturing The Invisible webpage.
On the local convexity of intersection bodies of revolution
Creators: name: Alfonseca, M. Angeles
name: Kim, Jaegil
Publisher: name: arXiv
Year: 2013
Subjects: subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 52A20, 52A38, 44A12

description: One of the fundamental results in Convex Geometry is Busemann's theorem, which states that the intersection body of a symmetric convex body is convex. Thus, it is only natural to ask if there is a quantitative version of Busemann's theorem, i.e., if the intersection body operation actually improves convexity. In this paper we concentrate on the symmetric bodies of revolution to provide several results on the (strict) improvement of convexity under the intersection body operation. It is shown that the intersection body of a symmetric convex body of revolution has the same asymptotic behavior near the equator as the Euclidean ball. We apply this result to show that in sufficiently high dimension the double intersection body of a symmetric convex body of revolution is very close to an ellipsoid in the Banach-Mazur distance. We also prove results on the local convexity at the equator of intersection bodies in the class of star bodies of revolution.
description: 22 pages, 2 figures
Behandlung von Straßenabflüssen : Anlagen zur Behandlung und Filtration von Straßenabflüssen in Gebieten mit Trennsystemen ; Neuentwicklungen und Untersuchungen
Creators: name: Sommer, Harald
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Regenwasserbewirtschaftung
subject: Trennsystem
subject: Schadstoffreduzierung
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: [no abstract]
On the characterization of some classes of proximally smooth sets
Creators: name: Crasta, Graziano
name: Fragalà, Ilaria
Publisher: name: arXiv
Year: 2013
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: Primary 26B25, Secondary 26B05, 53A05

description: We provide a complete characterization of closed sets with empty interior and positive reach in $\mathbb{R}^2$. As a consequence, we characterize open bounded domains in $\mathbb{R}^2$ whose high ridge and cut locus agree, and hence $C^1$ planar domains whose normal distance to the cut locus is constant along the boundary. The latter results extends to convex domains in $\mathbb{R}^n$.
description: 19 pages, 3 figures
Delphinium ajacis
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: D. Ajacis L. (C. Ajacis Schur) Cat. L und 11. Zierpflanze.Gelegentlich verwildert und verschleppt, so neuerdings:Vouvry, Kornfeld (Villaret 1947).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Einflussgrößen der photokatalytischen und thermischen Totaloxidation von Kohlenwasserstoffen an Zinndioxid am Beispiel der Reaktion von Propen mit Sauerstoff
Creators: name: Finger, Mina Maria
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Zinndioxid
subject: Photokatalyse
subject: heterogene Katalyse
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
title: Conversion of Cellulose-based Papers into Functional Ceramic Papers
Creators: name: Ott, Alexander
Publisher: name: UNSPECIFIED
Year: 2022

description: Paper has been used for thousands of years, be it as a writing utensil like Papyrus or in different applications, for example as cellulose-based nanogenerators, as shape memory polymers, or as membranes for wound healing. Its microstructure shows randomly arranged fibers consisting of cellulose. Furthermore, it represents a good alternative as a template material due to its unique intrinsic properties and versatile modification potential as a functional material. The main characteristic of functional materials is their tunability towards the desired electronic, magnetic, or optical properties. This dissertation introduces the synthesis of functional ceramic papers and focuses on the understanding of occurring processes during functionalization. The ceramic papers were produced using a so-called “One-Pot” synthesis approach by dipping different types of cellulose-based papers (Sartorius, Linters and Eucalyptus) into a solution, consisting of different transition metals and polysilazanes. After vacuum drying the impregnated pre-ceramic papers, they were pyrolyzed at different atmospheres and temperatures. The phase composition of the produced ceramic papers and the belonging powders were studied using different characterization techniques. Fourier-transform infrared spectroscopy (FTIR) allowed to investigate the bonding situation of the functional groups, while X-Ray diffraction (XRD) identified the crystalline phases. The carbonization of the cellulose template during pyrolysis was studied using µ-Raman spectroscopy. Thermogravimetric Analysis (TGA) was used to determine the thermal stability of the impregnated papers and their volatile components based on the weight loss that occurs during pyrolysis. Lastly, electrocatalytic and electromagnetic measurements were performed with the ceramic papers and compared with state-of-the-art compositions.
ZwischenRäume : raumrelevante Implikationen der EU-Erweiterungen in peripherisierten Gebieten Nordwestrusslands
Creators: name: Sünnemann, Arne
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Zentrum-Peripherie
subject: regionale Entwicklung
subject: russländische Föderation
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie

description: [no abstract]
title: “I could hardly be called an ignorant fanatic”. Ekaterina Breshko-Breshkovskaia and the Construction of a Revolutionary Autobiography
Creators: name: Fischer von Weikersthal, Felicitas
Publisher: name: AvtobiografiЯ
Year: 2017

description: Ekaterina Breshko-Breshkovskaia is one of the better-known protagonists of the Russian Revolution, often referred to as the grandmother (babushka) of the revolution. Her auto/biographical writings have been composed in different periods and to different audiences. Therefore, the question of whether the presentation of babushka’s autobiography and of the revolutionary movement changed over the course of time and in view of the audience is of particular interest. How did Breshko-Breshkovskaia represent the revolutionary cause, the revolutionary biography, and the ideals of a revolutionist’s life? Which strategies did she use to attract the audience and how did she explain her pathway to radicalization? What does this tell us about the self-perception of the revolutionaries – and especially female revolutionaries – or at least of babushka’s concept of a revolutionary life?
Synthetic Topological Qubits in Conventional Bilayer Quantum Hall Systems
Creators: name: Barkeshli, Maissam
name: Qi, Xiao-Liang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The idea of topological quantum computation is to build powerful and robust quantum computers with certain macroscopic quantum states of matter called topologically ordered states. These systems have degenerate ground states that can be used as robust "topological qubits" to store and process quantum information. However, a topological qubit has not been realized since the proposed systems either require sophisticated topologically ordered states that are not available yet, or require complicated geometries that are too difficult to realize. In this paper, we propose a new experimental setup which can realize topological qubits in a simple bilayer fractional quantum Hall (FQH) system with proper electric gate configurations. Compared to previous works, our proposal is accessible with current experimental techniques and only involves well-established topological states. Our system can realize a large class of topological qubits, generalizing the Majorana zero modes studied in the recent literature to more computationally powerful possibilities. We propose three tunneling and interferometry experiments to detect the existence and non-local topological properties of the topological qubits.
description: 6 pages (text + refs) + 8 pages appendix
title: Living for a ‘Cause’ Radical Autobiographical Writing in Russia at the Beginning of the 20 th Century
Creators: name: Rindlisbacher, Stephan
Publisher: name: AvtobiografiЯ
Year: 2017

description: The ambiguous term delo (thing, matter, act or cause) was fundamental for the th Russian radical autobiographical writers at the beginning of the 20 century. The dedication to a cause was the ‘leading star’ to frame one’s own biography, as it proved one’s reputation within the radical milieu. Therefore, it was important not only to choose which parts of one’s radical past needed to be emphasised, but also which deeds were better to silence, omit or vindicate. While radical writers often framed the topics of their autobiographies in a similar way, polemics and debates generated among the senior radicals. This article proposes basic guidelines on how to read and analyse the numerous Russian radical autobiographical writings by identifying the most common authors’ choices of framing and emplotment.
Paul Coldwell: Picturing the Invisible Exhibition
Creators: name: Coldwell, Paul
Publisher: name: University of the Arts London
Year: 2023
Subjects: Design practice and methods
Art theory
Architecture not elsewhere classified
Digital curation and preservation
British and Irish literature
Forensic science and management
Textile and fashion design
Medical ethics
Psychiatry (incl. psychotherapy)
Philosophy of mind (excl. cognition)
High energy astrophysics and galactic cosmic rays

description: Artist Paul Coldwell exhibits a new body of work exploring the notion of absence in Sir John Soane’s Museum, derived from over a year’s research.
Simultanes Visualisieren der Konzentrationsfelder zweier Farbstoffe beim Strahlmischen
Creators: name: Volpe, Letizia
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Flüssigkeitsstrahlen
subject: Mikromischen
subject: tomographische Zweiwellenlängenphotometrie
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: [no abstract]
The 70 Month Swift-BAT All-Sky Hard X-Ray Survey
Creators: name: Baumgartner, W. H.
name: Tueller, J.
name: Markwardt, C. B.
name: Skinner, G. K.
name: Barthelmy, S.
name: Mushotzky, R. F.
name: Evans, P.
name: Gehrels, N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present the catalog of sources detected in 70 months of observations of the BAT hard X-ray detector on the Swift gamma-ray burst observatory. The Swift-BAT 70 month survey has detected 1171 hard X-ray sources (more than twice as many sources as the previous 22 month survey) in the 14-195 keV band down to a significance level of 4.8 sigma, associated with 1210 counterparts. The 70 month Swift-BAT survey is the most sensitive and uniform hard X-ray all-sky survey and reaches a flux level of 1.03e-11 ergs/sec/cm2 over 50% of the sky and 1.34e-11 ergs/sec/cm2 over 90% of the sky. The majority of new sources in the 70 month survey continue to be AGN, with over 700 in the 70 month survey catalog. As part of this new edition of the Swift-BAT catalog, we also make available 8-channel spectra and monthly-sampled lightcurves for each object detected in the survey at the Swift-BAT 70 month website.
description: Submitted to ApJS on 16 Nov 2012. 23 pages, 15 figures. The Swift-BAT 70-month Survey public website can be found at http://swift.gsfc.nasa.gov/docs/swift/results/bs70mon/
title: Декабристская автобиография: проблемы источниковедческой интерпретации
Creators: name: Edelman, Ol’ga
Publisher: name: AvtobiografiЯ
Year: 2017

description: The similarity of the memoirs of the Decembrists originates not only from the common social, cultural and ideological background of the authors, but also from the fact that they all discussed their prison term in Siberia. This way, their individual memory melted into a collective one. However, the memoirs allow us to see some specific features of the protagonists of the Decembrist generation.
High power Kerr-lens mode-locked thin-disk oscillators
Creators: name: Cardoso De Andrade, José Ricardo
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: ultrafast optics
subject: high-power thin-disk lasers
subject: pulse compression
subject: fceo locking
subject: Ultrakurzpulslaser
subject: Hochleistung Scheibenlaser
subject: Pulskompression
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Titanium doped sapphire (Ti:sapphire) systems are the backbone of current ultrafast technology and they are invaluable research tools in contemporary science. However, little progress was observed in their average power scaling due to lack of suitable pumping systems, therefore, no Ti:sapphire laser in the kilowatt-class exists. In contrast, ytterbium (Yb) doped gain media is cementing itself as the new-wave of ultrafast technology. Enabled by the diminished costs of high-grade crystal production for industrial applications, maturity of optics and the developments of high power laser diodes able to pump these gain media, Yb-doped solid-state laser are more cost effective, compact and of lower complexity when compared to titanium doped sapphire systems. Not only does this makes them attractive for industrial applications, but their lowered complexity and cost mean that their further dissemination through the scientific world becomes easier, opening the doors to cutting-edge research in every scientific subject. Within this frame, the development aspects of compact high power ultrafast thin-disk laser oscillators based on Yb gain media will be given. Not only about their design and implementation, but also on how to further improve a system by its post-compression and implementing carrier-envelope offset (ϕ CEO ) locking. At the core of this work is the understanding and effective implementation of hard-aperture Kerr-lens mode-locking which enables a successful exploitation of the gain bandwidth offered by these gain media. The work being reported in this thesis aims to deliver several of the important aspects and hurdles which may be encountered while implementing a state-of-the-art high-power system and also provide a groundwork to future developments by the demonstration of two things: first, how to improve existing numerical methods to help with the design of high-power oscillators and second, give a detailed guide towards the ϕ CEO locking of such systems.
Interplay of 4f-3d Magnetism and Ferroelectricity in DyFeO3
Creators: name: Rajeswaran, B.
name: Sanyal, D.
name: Chakrabarti, Mahuya
name: Sundarayya, Y.
name: Sundaresan, A.
name: Rao, C. N. R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: DyFeO3 exhibits a weak ferromagnetism (TNFe ~ 645 K) that disappears below a spin-reorientation (Morin) transition at TSRFe ~ 50 K. It is also known that applied magnetic field induces ferroelectricity at the magnetic ordering temperature of Dy-ions (TNDy ~ 4.5 K). Here, we show that the ferroelectricity exists in the weak ferromagnetic state (TSRFe < T < TN,C) without applying magnetic field, indicating the crucial role of weak ferromagnetism in inducing ferroelectricity. 57Fe Mössbauer studies show that hyperfine field (Bhf) deviates from mean field-like behaviour that is observed in the weak ferromagnetic state and decreases below the onset of spin-reorientation transition (80 K), implying that the Bhf above TSR had additional contribution from Dy-ions due to induced magnetization by the weak ferromagnetic moment of Fe-sublattice and below TSR, this contribution decreases due to collinear ordering of Fe-sublattice. These results clearly demonstrate the presence of magnetic interactions between Dy(4f) and Fe(3d) and their correlation with ferroelectricity in the weak ferromagnetic state of DyFeO3.
description: 5 pages, 6 figures, published in EPL
Zur Totalsynthese von Hexacyclinsäure
Creators: name: Stelmakh, Andriy
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Totalsynthese
subject: Naturstoffchemie
subject: Hexacyclinsäure
subject: FR182877
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
Hamilton-Jacobi theory in k-cosymplectic field theories
Creators: name: de León, M.
name: Vilariño, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this paper we extend the geometric formalism of the Hamilton-Jacobi theory for time dependent Mechanics to the case of classical field theories in the k-cosymplectic framework.
Mechanismus und Regulation eines prozessiven Klasse V Myosins
Creators: name: Taft, Manuel Henry
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Myosin
subject: Kinetik
subject: Prozessivität
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Continuous Order Identification of PHWR Models Under Step-back for the Design of Hyper-damped Power Tracking Controller with Enhanced Reactor Safety
Creators: name: Das, Saptarshi
name: Mukherjee, Sumit
name: Das, Shantanu
name: Pan, Indranil
name: Gupta, Amitava
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, discrete time higher integer order linear transfer function models have been identified first for a 500 MWe Pressurized Heavy Water Reactor (PHWR) which has highly nonlinear dynamical nature. Linear discrete time models of the nonlinear nuclear reactor have been identified around eight different operating points (power reduction or step-back conditions) with least square estimator (LSE) and its four variants. From the synthetic frequency domain data of these identified discrete time models, fractional order (FO) models with sampled continuous order distribution are identified for the nuclear reactor. This enables design of continuous order Proportional-Integral-Derivative (PID) like compensators in the complex w-plane for global power tracking at a wide range of operating conditions. Modeling of the PHWR is attempted with various levels of discrete commensurate-orders and the achievable accuracies are also elucidated along with the hidden issues, regarding modeling and controller design. Credible simulation studies are presented to show the effectiveness of the proposed reactor modeling and power level controller design. The controller pushes the reactor poles in higher Riemann sheets and thus makes the closed loop system hyper-damped which ensures safer reactor operation at varying dc-gain while making the power tracking temporal response slightly sluggish; but ensuring greater safety margin.
description: 37 pages, 18 figures
The Dictionary of Invisible Meanings
Creators: name: Coldwell, Paul
Publisher: name: University of the Arts London
Year: 2023
Subjects: Design practice and methods
Art theory
Architecture not elsewhere classified
Digital curation and preservation
British and Irish literature
Forensic science and management
Textile and fashion design
Medical ethics
Psychiatry (incl. psychotherapy)
Philosophy of mind (excl. cognition)
High energy astrophysics and galactic cosmic rays

description: The Dictionary of Invisible Meanings takes shape from the observation that one of the most important barriers to cross-disciplinary collaboration is the different use of language between disciplines. The same terms take on very different meanings across different disciplines, often in contrast with their more commonplace, colloquial usage. This thread of the work of the Network aims to bring to the fore some of the multi-layered meanings that words often hide: words that are transparent signifiers to those who are educated in a specific discipline become (wittingly or unwittingly) opaque barriers to understanding by and communication with those outside the field.
The Physical Structure of Protoplanetary Disks: the Serpens Cluster Compared with Other Regions
Creators: name: Oliveira, Isa
name: Merin, Bruno
name: Pontoppidan, Klaus M.
name: van Dishoeck, Ewine F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Spectral energy distributions are presented for 94 young stars surrounded by disks in the Serpens Molecular Cloud, based on photometry and Spitzer IRS spectra. Taking a distance to the cloud of 415 pc rather than 259 pc, the distribution of ages is shifted to lower values, in the 1-3 Myr range, with a tail up to 10 Myr. The mass distribution spans 0.2-1.2 Msun, with median mass of 0.7 Msun. The distribution of fractional disk luminosities in Serpens resembles that of the young Taurus Molecular Cloud, with most disks consistent with optically thick, passively irradiated disks in a variety of disk geometries (Ldisk/Lstar ~ 0.1). In contrast, the distributions for the older Upper Scorpius and Eta Chamaeleontis clusters are dominated by optically thin lower luminosity disks (Ldisk/Lstar ~ 0.02). This evolution in fractional disk luminosities is concurrent with that of disk fractions. The actively accreting and non-accreting stars (based on Ha data) in Serpens show very similar distributions in fractional disk luminosities, differing only in the brighter tail dominated by strongly accreting stars. In contrast with a sample of Herbig Ae/Be stars, the T Tauri stars in Serpens do not have a clear separation in fractional disk luminosities for different disk geometries: both flared and flat disks present wider, overlapping distributions. This result is consistent with previous suggestions of a faster evolution for disks around Herbig Ae/Be stars. Furthermore, the results for the mineralogy of the dust in the disk surface do not show any correlation to either stellar and disk characteristics or mean cluster age in the 1-10 Myr range probed here. A possible explanation for the lack of correlation is that the processes affecting the dust within disks have short timescales, happening repeatedly, making it difficult to distinguish long lasting evolutionary effects. [abridged]
description: ApJ in press
Mykologische und epidemiologische Untersuchungen des Pathosystems Mycosphaerella anethi - Arzneifenchel (Foeniculum vulgare Mill.)
Creators: name: Taubenrauch, Kerstin
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Blatt- und Stängelanthraknose
subject: Sortenresistenz
subject: Befallskurve
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
Entwicklung immunchemischer Schnelltestverfahren
Creators: name: Stückmann, Henning
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Staphylococcus Enterotoxin B
subject: Microcystin-LR
subject: Schnelltest
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Geometric convexity of the generalized sine and the generalized hyperbolic sine
Creators: name: Jiang, Wei-Dong
name: Qi, Feng
Publisher: name: arXiv
Year: 2013
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 33B10 (Primary) 26A51, 26D05, 33C20 (Secondary)

description: In the paper, the authors prove that the generalized sine function $\sin_{p,q}(x)$ and the generalized hyperbolic sine function $\sinh_{p,q}(x)$ are geometrically concave and geometrically convex, respectively. Consequently, the authors verify a conjecture posed in the paper "B. A. Bhayo and M. Vuorinen, On generalized trigonometric functions with two parameters, J. Approx. Theory 164 (2012), no.~10, 1415\nobreakdash--1426; Available online at \url{http://dx.doi.org/10.1016/j.jat.2012.06.003}".
description: 5 pages
title: ÐÐ±ÑÐ°Ð±Ð¾ÑÐºÐ° ÑÐ¸Ð³Ð½Ð°Ð»Ð¾Ð² Ð² Ð¸Ð½ÑÐµÑÐ²Ð°Ð»ÑÐ½Ð¾Ð¹ ÑÑÐ°ÑÐ¸ÑÑÐ¸ÐºÐµ
title: ÑÑÐµÐ±Ð½Ð¾Ðµ Ð¿Ð¾ÑÐ¾Ð±Ð¸Ðµ
titleType: Subtitle
Creators: name: ÐÐ°Ð¶ÐµÐ½Ð¾Ð², ÐÐ»ÐµÐºÑÐ°Ð½Ð´Ñ
name: ÐÐ°Ð±Ð°ÑÐ¸Ð½Ð°, Ð¡Ð¾ÑÑÑ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2025
Subjects: ÐÐ½ÑÐµÑÐ²Ð°Ð»ÑÐ½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð· (Ð¼Ð°Ñ.)
ÐÑÑÐ¸ÑÐ»Ð¸ÑÐµÐ»ÑÐ½Ð°Ñ Ð¼Ð°ÑÐµÐ¼Ð°ÑÐ¸ÐºÐ°
Ð­Ð»ÐµÐºÑÑÐ¸ÑÐµÑÐºÐ¸Ðµ ÑÐ¸Ð³Ð½Ð°Ð»Ñ
Ð¸Ð½ÑÐµÑÐ²Ð°Ð»ÑÐ½Ð°Ñ ÑÑÐ°ÑÐ¸ÑÑÐ¸ÐºÐ°
Ð¸Ð½ÑÐµÑÐ²Ð°Ð»ÑÐ½ÑÐµ ÑÐ²Ð¸Ð½Ñ
ÑÐ²Ð¸Ð½Ð½Ð°Ñ ÑÐµÐ³ÑÐµÑÑÐ¸Ñ
Ð±Ð¾ÐºÑ-Ð¿Ð»Ð¾ÑÑ
ÑÑÐµÐ±Ð½Ð¸ÐºÐ¸ Ð¸ Ð¿Ð¾ÑÐ¾Ð±Ð¸Ñ Ð´Ð»Ñ Ð²ÑÐ·Ð¾Ð²

description: Ð£ÑÐµÐ±Ð½Ð¾Ðµ Ð¿Ð¾ÑÐ¾Ð±Ð¸Ðµ Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð¾ Ð¾Ð±ÑÐ°Ð±Ð¾ÑÐºÐµ ÑÐ¸Ð³Ð½Ð°Ð»Ð¾Ð² Ð² Ð¸Ð½ÑÐµÑÐ²Ð°Ð»ÑÐ½Ð¾Ð¼ Ð°Ð½Ð°Ð»Ð¸Ð·Ðµ. ÐÐ²Ð¾Ð´ÑÑÑÑ Ð±Ð°Ð·Ð¾Ð²ÑÐµ ÑÐ²ÐµÐ´ÐµÐ½Ð¸Ñ Ð¸Ð· Ð¸Ð½ÑÐµÑÐ²Ð°Ð»ÑÐ½Ð¾Ð³Ð¾ Ð°Ð½Ð°Ð»Ð¸Ð·Ð° Ð¸ Ð¸Ð½ÑÐµÑÐ²Ð°Ð»ÑÐ½Ð¾Ð¹ ÑÑÐ°ÑÐ¸ÑÑÐ¸ÐºÐ¸. ÐÑÐ¾Ð±Ð¾Ðµ Ð²Ð½Ð¸Ð¼Ð°Ð½Ð¸Ðµ ÑÐ´ÐµÐ»ÐµÐ½Ð¾ Ð¿Ð¾Ð»ÑÑÐµÐ½Ð¸Ñ Ð¾Ð´Ð½Ð¾Ð²ÑÐµÐ¼ÐµÐ½Ð½Ð¾ Ð²Ð½ÑÑÑÐµÐ½Ð½Ð¸Ñ Ð¸ Ð²Ð½ÐµÑÐ½Ð¸Ñ Ð¾ÑÐµÐ½Ð¾Ðº Ð´Ð°Ð½Ð½ÑÑ Ð¸ ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÐ¾Ð² Ð¸Ñ Ð¾Ð±ÑÐ°Ð±Ð¾ÑÐºÐ¸. ÐÑÐ¸ÑÐ¼Ñ Ð¾Ð±ÑÐ°Ð±Ð¾ÑÐºÐ¸ ÑÐ¸Ð³Ð½Ð°Ð»Ð¾Ð² Ð¿ÑÐ¾Ð¸Ð»Ð»ÑÑÑÑÐ¸ÑÐ¾Ð²Ð°Ð½Ñ Ð½Ð° Ð¿ÑÐ¸Ð¼ÐµÑÐµ Ð´Ð°Ð½Ð½ÑÑ Ð¼Ð½Ð¾Ð³Ð¾ÐºÐ°Ð½Ð°Ð»ÑÐ½Ð¾Ð³Ð¾ Ð¸Ð·Ð¼ÐµÑÐ¸ÑÐµÐ»Ñ Ñ Ð°Ð½Ð°Ð»Ð¾Ð³Ð¾Ð²Ð¾Ð¹ Ð¿Ð°Ð¼ÑÑÑÑ. ÐÑÐ¸Ð²Ð¾Ð´Ð¸ÑÑÑ Ð½ÐµÐ¾Ð±ÑÐ¾Ð´Ð¸Ð¼Ð°Ñ Ð¸Ð½ÑÐ¾ÑÐ¼Ð°ÑÐ¸Ñ Ð¾Ð± Ð¾ÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ð¸ ÑÐ²ÐµÑÑÐ±ÑÑÑÑÐ¾Ð¹ Ð°Ð½Ð°Ð»Ð¾Ð³Ð¾Ð²Ð¾Ð¹ Ð¿Ð°Ð¼ÑÑÐ¸. ÐÐ°ÑÐµÑÐ¸Ð°Ð» Ð°Ð¿ÑÐ¾Ð±Ð¸ÑÐ¾Ð²Ð°Ð½ Ð² ÑÑÐµÐ±Ð½Ð¾Ð¼ ÐºÑÑÑÐµ âÐ§Ð¸ÑÐ»ÐµÐ½Ð½ÑÐµ Ð¼ÐµÑÐ¾Ð´Ñ Ð² ÑÐ¸Ð·Ð¸ÐºÐµâ Ð´Ð»Ñ Ð°ÑÐ¿Ð¸ÑÐ°Ð½ÑÐ¾Ð² Ð¤Ð¢Ð Ð¸Ð¼. Ð. Ð¤. ÐÐ¾ÑÑÐµ Ð ÐÐ Ð¸ Ð² ÑÑÐµÐ±Ð½ÑÑ ÐºÑÑÑÐ°Ñ âÐÐ½ÑÐµÑÐ²Ð°Ð»ÑÐ½ÑÐ¹ Ð°Ð½Ð°Ð»Ð¸Ð·â Ð¸ âÐÐ½Ð°Ð»Ð¸Ð· Ð´Ð°Ð½Ð½ÑÑ Ñ Ð¸Ð½ÑÐµÑÐ²Ð°Ð»ÑÐ½Ð¾Ð¹ Ð½ÐµÐ¾Ð¿ÑÐµÐ´ÐµÐ»ÑÐ½Ð½Ð¾ÑÑÑÑâ Ð² Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¾Ð¼ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¾Ð¼ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑÐµ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾ Ð² 2018-2024 Ð³Ð³. ÐÐ¾ÑÐ¾Ð±Ð¸Ðµ Ð¿ÑÐµÐ´Ð½Ð°Ð·Ð½Ð°ÑÐ°ÐµÑÑÑ Ð´Ð»Ñ ÑÑÑÐ´ÐµÐ½ÑÐ¾Ð² Ð¸ Ð°ÑÐ¿Ð¸ÑÐ°Ð½ÑÐ¾Ð² ÐµÑÑÐµÑÑÐ²ÐµÐ½Ð½Ð¾Ð½Ð°ÑÑÐ½ÑÑ ÑÐ¿ÐµÑÐ¸Ð°Ð»ÑÐ½Ð¾ÑÑÐµÐ¹, Ð° ÑÐ°ÐºÐ¶Ðµ Ð´Ð»Ñ ÑÑÑÐ½ÑÑ Ð¸ Ð¸Ð½Ð¶ÐµÐ½ÐµÑÐ¾Ð², Ð¸Ð½ÑÐµÑÐµÑÑÑÑÐ¸ÑÑÑ Ð²Ð¾Ð¿ÑÐ¾ÑÐ°Ð¼Ð¸ Ð¼Ð°ÑÐµÐ¼Ð°ÑÐ¸ÑÐµÑÐºÐ¾Ð¹ Ð¾Ð±ÑÐ°Ð±Ð¾ÑÐºÐ¸ ÑÐºÑÐ¿ÐµÑÐ¸Ð¼ÐµÐ½ÑÐ¾Ð².
title: Proportional Integral Differential (PID) Controller
Creators: name: Abdullahi Tekanyi, Angulu Rakiya & Kabir Abu-Bilal
Publisher: name: Covenant University
Year: 2019

description: Piezoelectric ceramics are used in many areas of applications. One of such areas of applications is in controlling electronic devices for accuracy and improved precision. Piezoelectric ceramics however have the problem of inherent high resonance frequency resulting in the piezoelectric ceramic suffering from hysteresis and delay in response to input parameters. PID controllers have been used in providing improved control and response to the piezoelectric ceramic so as to overcome the problem of hysteresis as well as the inherent high resonance frequency and slow response of the piezoelectric ceramic. However, PID controllers have the problem of overshoot as a result of sub-optimal selection of PID tuning parameters. PID controllers also take a long time in adjusting to changes due to error. This paper presents a firefly algorithm based PID controller (F-PID) for minimizing the effect of hysteresis in piezoelectric ceramics and also improving the response of the PID controller.
p53-unabhängige Kontrollpunkte in Antwort auf Telomerdysfunktion in Leberzellen
Creators: name: Lechel, André
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Hepatokarzinogenese
subject: p53-Deletion
subject: Telomeredysfunktion
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Zur Realisierung von Mega-Windturbinen auf See : Sonderforschungsbereich entwickelt digitalen Zwilling
Creators: name: Rolfes, Raimund
name: Hübler, Clemens
name: Ehrmann, Andreas
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2022
Subjects: subject: Energieversorgung
subject: Transformation
subject: Erneuerbare Energien
subject: Energiewende
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft::333 | Boden- und Energiewirtschaft::333,7 | Natürliche Ressourcen, Energie und Umwelt

description: [no abstract available]
The temperatures of Red Supergiants
Creators: name: Davies, Ben
name: Kudritzki, Rolf-Peter
name: Plez, Bertrand
name: Trager, Scott
name: Lancon, Ariane
name: Gazak, Zach
name: Bergemann, Maria
name: Evans, Chris
name: Chiavassa, Andrea
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a re-appraisal of the temperatures of Red Supergiants (RSGs) using their optical and near-infrared spectral energy distributions (SEDs). We have obtained data of a sample of RSGs in the Magellanic Clouds using VLT+XSHOOTER, and we fit MARCS model atmospheres to different regions of the spectra, deriving effective temperatures for each star from (a) the TiO bands, (b) line-free continuum regions of the spectral energy distributions (SEDs), and (c) the integrated fluxes. We show that the temperatures derived from fits to the TiO bands are systematically {\it lower} than the other two methods by several hundred Kelvin. The TiO fits also dramatically over-predict the flux in the near-IR, and imply extinctions which are anomalously low compared to neighbouring stars. In contrast, the SED temperatures provide good fits to the fluxes at all wavelengths other than the TiO bands, are in agreement with the temperatures from the flux integration method, and imply extinctions consistent with nearby stars. After considering a number of ways to reconcile this discrepancy, we conclude that 3-D effects (i.e.\ granulation) are the most likely cause, as they affect the temperature structure in the upper layers where the TiO lines form. The continuum, however, which forms at much deeper layers, is apparently more robust to such effects. We therefore conclude that RSG temperatures are much warmer than previously thought. We discuss the implications of this result for stellar evolution and supernova progenitors, and provide relations to determine the bolometric luminosities of RSGs from single-band photometry.
description: 21 pages, 26 figures. Accepted for publication in ApJ
Studien zur Totalsynthese von Ripostatin A & B
Creators: name: Kujat, Christof
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Antibiotika
subject: RNA Polymeraseinhibitoren
subject: Naturstoffsynthese
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]