cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A study of gene expression of Saccharomyces cerevisiae in oscillating continous cultures using DNA microarray technology
Creators: name: Khalil Ahmed, Ahmed Abd Allah
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2008
Subjects: subject: Yeast
subject: Saccharomyces cerevisiae
subject: oscillation
subject: continuous cultivation
subject: gene expression. RNA
subject: DNA
subject: microarray
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Scaling issues in multi-criteria evaluation of combinations of measures for integrated river basin management
Creators: name: Dietrich, Jörg
Publisher: name: Göttingen : Copernicus GmbH
Year: 2016
Subjects: subject: system
subject: river basin management
subject: Werra
subject: Germany
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: In integrated river basin management, measures for reaching the environmental objectives can be evaluated at different scales, and according to multiple criteria of different nature (e.g. ecological, economic, social). Decision makers, including responsible authorities and stakeholders, follow different interests regarding criteria and scales. With a bottom up approach, the multi criteria assessment could produce a different outcome than with a top down approach. The first assigns more power to the local community, which is a common principle of IWRM. On the other hand, the development of an overall catchment strategy could potentially make use of synergetic effects of the measures, which fulfils the cost efficiency requirement at the basin scale but compromises local interests. Within a joint research project for the 5500 km2 Werra river basin in central Germany, measures have been planned to reach environmental objectives of the European Water Framework directive (WFD) regarding ecological continuity and nutrient loads. The main criteria for the evaluation of the measures were costs of implementation, reduction of nutrients, ecological benefit and social acceptance. The multi-criteria evaluation of the catchment strategies showed compensation between positive and negative performance of criteria within the catchment, which in the end reduced the discriminative power of the different strategies. Furthermore, benefit criteria are partially computed for the whole basin only. Both ecological continuity and nutrient load show upstream-downstream effects in opposite direction. The principles of "polluter pays" and "overall cost efficiency" can be followed for the reduction of nutrient losses when financial compensations between upstream and downstream users are made, similar to concepts of emission trading.
Auswirkungen unterschiedlicher Bindemittelkombinationen auf die Alkali-Kieselsäure-Reaktion
Creators: name: Beyer, Dries
name: Haist, Michael
name: Lohaus, Ludger
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2019
Subjects: subject: Alkali-Kieselsäure-Reaktion
subject: OH--Ionen
subject: Zusatzstoff
subject: AKR-Schädigung
subject: w/z-Wert
subject: Alkali-silica reaction
subject: OH--ion
subject: additives
subject: AKR damage
subject: w/c value
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Die Alkali-Kieselsaure-Reaktion (AKR) führt nach wie vor zu einer Vielzahl von Schadensfallen in Deutschland. Somit zeigt sich, dass derzeitige Vermeidungsstrategien nicht ausreichend sind. Dies gilt insbesondere für den modernen Betonbau, der durch Mehrstoffsysteme mit stark unterschiedlichen Bindemittelzusammensetzungen und geringen w/z- bzw. w/b-Werten gekennzeichnet ist. Die Komplexität des AKR-Schädigungsprozesses sowie die große Bandbreite von Kompositzementen und Zusatzstoffen führen einerseits zu schadensverschärfenden Randbedingungen, z.B. infolge niedriger w/z-Werte. Andererseits können schadensvermeidende oder schadensreduzierende Einflüsse der Zusatzstoffe nicht adäquat ausgenutzt werden, weil sie in den aktuellen Regelwerken nicht berücksichtigt werden. Im vorliegenden Beitrag werden die Einflüsse unterschiedlicher Bindemittelkombinationen auf die resultierende OH--Ionenkonzentration in der Porenlösung und die damit einhergehende Längenänderung – als Indikator für eine AKR-Schädigung – systematisch und quantitativ ermittelt und bewertet. Dabei soll das bislang nicht genutzte Potenzial der Zusatzstoffe und Kompositzemente im Hinblick auf eine Erhöhung des AKR-Widerstands aufgezeigt werden.
description: The alkali-silica reaction (ASR) still leads to a large number of damage cases in Germany. This shows that current avoidance strategies are not sufficient. This applies in particular to modern concrete construction, which is characterised by multi-component systems with very different binder compositions and low w/c or w/c values. The complexity of the ASR damage process as well as the wide range of composite cements and additives lead on the one hand to damage aggravating boundary conditions, e.g. due to low w/c values. On the other hand, damage-preventing or damage-reducing influences of the additives cannot be adequately exploited because they are not taken into account in the current regulations. In this paper, the influences of different binder combinations on the resulting OH-ion concentration in the pore solution and the resulting change in length - as an indicator for an ASR damage - are systematically and quantitatively determined and evaluated. The potential of the additives and composite cements, which has so far not been used, with regard to an increase of the ASR resistance, is to be shown.
Zustandsentwicklung und -prognose von Eisenbahnbrücken
Creators: name: Naraniecki, Hubert
name: Marx, Steffen
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2019
Subjects: subject: Eisenbahnbrücken
subject: Brückenzustand
subject: Zustandsentwicklung
subject: Zustandsprognose
subject: prädiktives Instandhaltungsmanagement
subject: railway bridges
subject: bridge condition
subject: condition development
subject: condition prediction
subject: predictive maintenance management
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Der vorliegende Beitrag befasst sich im Rahmen des Forschungsprojekts DiMaRB (Digital Maintenance of Railway Bridges) mit der Auswertung einer Datenbank der DB AG, die zu den Eisenbahnbrücken vorliegt. Ziel ist es, Prognosen zu Zustandsentwicklungen unterschiedlicher Bauwerksarten von Eisenbahnbrücken zu erstellen und dafür die maßgebenden Einflussparameter (Merkmale) zu charakterisieren. Die hier dargestellten Untersuchungen beschränken sich größtenteils auf Daten von Stahlbeton-, Spannbeton- und Rahmenbrücken. Aus den Ergebnissen geht erwartungsgemäß hervor, dass das Bauwerksalter den ausschlaggebenden Einfluss auf den Zustand einer Brücke hat, die Entwicklung allerdings von weiteren Merkmalen wie dem statischen System und der Bauwerksart beeinflusst wird. Ein Zusammenhang zwischen dem Bauwerkszustand und Größendimensionen wie beispielsweise der Stützweite oder Brückenfläche wurde nicht festgestellt.
description: The present article deals as a part of the research project DiMaRB (Digital Maintenance of Railway Bridges) with the evaluation of data concerning railway bridges of the DB AG. The aim is to create predictions of condition development for different structure types of railway bridges and therefore to characterize the relevant influencing parameters (features). In this article a closer look is only taken on data of reinforced concrete bridges, prestressed concrete bridges and concrete frame bridges. Results of the investigation are presented in chapter 4 and show that the age of bridges has a decisive influence on the bridge condition, but the condition development is influenced by other features such as the static system and the structure type. On the other hand, the maximum span of the bridge and the bridge surface seem to rather not affect the condition development.
Understanding the Movement of Cracked Solar Cell Parts in PV-modules during Mechanical Loading
Creators: name: Haase, Felix
name: Käsewieter, Jörg
name: Köntges, Marc
Publisher: name: London : Elsevier Ltd.
Year: 2016
Subjects: subject: Crack widths
subject: Crystalline solar cells
subject: Photovoltaic modules
subject: Crystalline materials
subject: Nematic liquid crystals
subject: Photovoltaic cells
subject: Solar cells
subject: Solar power generation
subject: Centers-of-mass
subject: Crack position
subject: Crack width
subject: Mechanical loading
subject: Parallel crack
subject: Three dimensional movement
subject: Cracks
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: We measure the three dimensional movement of cracked solar cell parts in standard sized PV-modules during a four line bending test. We develop a model which explains this movement assuming that the centers of mass of the solar cells or cell parts are fixed to the module glass. The widening of all cell gap widths is proportional to the bending roll displacement until a cell cracks in parallel to the bending rolls due to the tensile stress in the cells. At this point, the crack opens abruptly while the two parallel cell gaps next to the cracked cell close simultaneously by the same distance in sum. From here on, the cell gaps and the cell crack increases proportionally to the bending roll displacement. Since the distance between the centers of mass of both cracked cell parts is independent of the crack position, the crack width is also independent of the crack position for single cracks. Multiple parallel cracks in solar cells have smaller crack widths according to this model. Laminates without a backsheet show about 30% larger crack widths.
title: A Multidimensional Approach to Interorganizational Communication via Emergency Management Organizations and Their Twitter Accounts
Creators: name: Johnson, Lauren
Publisher: name: University of Kentucky Libraries
Year: 2019

description: Using an adaptation of O’Connor and Shumate’s (2018) theoretical propositions, this research examines interorganizational communication through the lens of multidimensional networks. Twitter data was crawled from a selection of emergency management organization accounts to measure affinity, representational, flow, and semantic networks. These data included the organizations’ followed accounts, retweets, replies, and mentions. A thematic analysis of the organizations’ mission statements was also conducted in order to inform the examination of the semantic networks. The results show a significant relationship between the number of accounts an organization follows and the likelihood of having its message shared. This research provides a further theoretical application of a network analysis method of studying interorganizational communication as well as a practical application for organizations seeking to increase their engagement on Twitter.
description: Copyright © Lauren Paige Johnson 2019
Schallemissionsmessungen zur Spanndrahtbrucherkennung
Creators: name: Wedel, Frederik
name: Käding, Max
name: Marx, Steffen
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2019
Subjects: subject: Spannbeton
subject: Schallemission
subject: Monitoring
subject: Merkmale
subject: Maschinelles Lernen
subject: Klassifikation
subject: prestressed concrete
subject: acoustic emission
subject: monitoring
subject: features
subject: machine learning
subject: classification
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Die Schallemissionsanalyse zur Spanndrahtbrucherkennung etabliert sich in Deutschland als Verfahren zur Überwachung vorgespannter Konstruktionen. Das Interesse liegt dabei auf der zuverlässigen Erkennung von Spanndrahtbrüchen, also der Beschreibung des Quellmechanismus. Zwei Forschungsschwerpunkte gehen damit einher, die hier thematisiert und erste Ergebnisse vorgestellt werden: Einerseits gilt es die Kette von der Signalentstehung, Signalübertragung bis hin zur aufgezeichneten Welle allgemeingültig zu formulieren, um Rückschlüsse auf den Quellmechanismus zu ziehen. Andererseits werden maschinelle Lernverfahren angewendet, um das Potential solcher Methoden auf diese Art von Daten aufzuzeigen. Nach Berechnung von Merkmalen aus dem Frequenzraum konnte bei einer Klassifikation von Hammerschlag-Signalen eine Genauigkeit von 98% erreicht werden.
description: Acoustic emission analysis for tendon wire break detection is establishing itself in Germany as a method for monitoring of prestressed structures. The focus lies in the reliable detection of tendon wire breaks, i.e. the description of the source mechanism. Two main areas of research are associated with this, whichare discussed in this paper: On the one hand, the measurement chain for describing the signal transmission from signal generation to the recorded wave must be formulated in a generally valid way in order to draw conclusions about the source mechanism. On the other hand, machine learning methods are used to show the potential of such methods for this kind of data. After calculating features from the frequency space, an accuracy of 98 % could be achieved with a classification.
A CURE in traits and species distributions: Reproductive modes, range sizes, and natural history collections
Creators: name: Allen, Jessica
name: Sharrett, Stephen
name: Denzer, Eli
name: Lendemer, James
Publisher: name: QUBES Educational Resources
Year: 2023

description: This course-based undergraduate research experience (CURE) focuses on developing hypotheses about how traits influence the range sizes of species. Topics with substantive content include symbioses, the Appalachian Mountains, lichen morphology, and natural history collections. Scientific skills development modules focus on hypothesis development and testing, geographic information systems, statistics, and preparing presentations and manuscripts. The CURE leverages a large-scale digitized set of freely available images of lichen herbarium specimens. It can be implemented in in-person, online, or hybrid classrooms and only requires students have access to a computer and the internet.
A posteriori Fehlerschätzer für elektromagnetische Kopplungsprobleme in drei Dimensionen
Creators: name: Teltscher, Matthias T.
Publisher: name: Hannover : Universität
Year: 2003
Subjects: subject: Maxwell's equations
subject: symmetric coupling
subject: a posteriori error estimators
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
A schema-based peer-to-peer infrastructure for digital library networks
Creators: name: Siberski, Wolf
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2006
Subjects: subject: Peer-to-peer networks
subject: distributed databases
subject: digital libraries
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: [no abstract]
Magnetotransport and induced superconductivity in Bi based three-dimensional topological insulators
Creators: name: Veldhorst, M.
name: Snelder, M.
name: Hoek, M.
name: Molenaar, C. G.
name: Leusink, D. P.
name: Golubov, A. A.
name: Hilgenkamp, H.
name: Brinkman, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The surface of a 3D topological insulator is conducting and the topologically nontrivial nature of the surface states is observed in experiments. It is the aim of this paper to review and analyze experimental observations with respect to the magnetotransport in Bi-based 3D topological insulators, as well as the superconducting transport properties of hybrid structures consisting of superconductors and these topological insulators. The helical spin-momentum coupling of the surface state electrons becomes visible in quantum corrections to the conductivity and magnetoresistance oscillations. An analysis will be provided of the reported magnetoresistance, also in the presence of bulk conductivity shunts. Special attention is given to the large and linear magnetoresistance. Superconductivity can be induced in topological superconductors by means of the proximity effect. The induced supercurrents, Josephson effects and current-phase relations will be reviewed. These materials hold great potential in the field of spintronics and the route towards Majorana devices.
description: Accepted review paper for focus issue on Topological Insulators - From materials design to reality (physica status solidi - RRL)
Building blocks for future detectors: Silicon test masses and 1550 nm laser light
Creators: name: Schnabel, Roman
name: Britzger, M.
name: Brückner, F.
name: Burmeister, O.
name: Danzmann, Karsten
name: Dück, J.
name: Eberle, Tobias
name: Friedrich, Daniel
name: Lück, Harald
name: Mehmet, Moritz
name: Nawrodt, Ronny
name: Steinlechner, S.
name: Willke, Benno
Publisher: name: Bristol : IOP Publishing Ltd.
Year: 2010
Subjects: subject: 1064 nm
subject: 1550 nm
subject: Building blockes
subject: Crystalline silicons
subject: Gravitational wave detectors
subject: Gravitational-wave detection
subject: Laser lights
subject: Low temperatures
subject: Quasi-monochromatic
subject: Room temperature
subject: Sensitivity increase
subject: Third generation
subject: Gravitational effects
subject: Gravity waves
subject: Laser radiation
subject: Radiation detectors
subject: Silica
subject: Silicon detectors
subject: Testing
subject: Fused silica
subject: Gravitationswelle
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Current interferometric gravitational wave detectors use the combination of quasi-monochromatic, continuous-wave laser light at 1064 nm and fused silica test masses at room temperature. Detectors of the third generation, such as the Einstein-Telescope, will involve a considerable sensitivity increase. The combination of 1550 nm laser radiation and crystalline silicon test masses at low temperatures might be important ingredients in order to achieve the sensitivity goal. Here we compare some properties of the fused silica and silicon test mass materials relevant for decreasing the thermal noise in future detectors as well as the recent technology achievements in the preparation of laser radiation at 1064 nm and 1550 nm relevant for decreasing the quantum noise. We conclude that silicon test masses and 1550 nm laser light have the potential to form the future building blocks of gravitational wave detection.
Active shape models with focus on overlapping problems applied to plant detection and soil pore analysis
Creators: name: Pastrana Pérez, Julio César
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Active shape models
subject: image processing
subject: pattern recognition
subject: landmarking
subject: ellipse fitting
subject: plant identification
subject: overlapping
subject: 3D shape recognition
subject: soil pores
subject: ellipsoid fitting
subject: Bildverarbeitung
subject: Mustererkennung
subject: Pflanzendetektion
subject: Überlappung
subject: 3D Formerkennung
subject: Bodenporen
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: [no abstract]
Unterwasser-Verformungsmessungen von Grouted Joints
Creators: name: Rzeczkowski, Patrick
name: Lohaus, Ludger
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2019
Subjects: subject: Offshore-Windenergie
subject: Grouted Joint
subject: Structural Health Monitoring
subject: mobile Messeinheit
subject: Messungen unter Wasser
subject: Offshore wind energy
subject: grouted joint
subject: structural health monitoring
subject: mobile measuring unit
subject: underwater measurement
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Die Verbindung zwischen dem in den Boden gerammten Pfahl und der Tragstruktur von Offshore-Windenergieanlagen wurde in Deutschland inzwischen bei über 1000 Anlagen als Grouted Joint ausgeführt. Nachdem es im Ausland bei zahlreichen Monopiles zu einem Durchrutschen von Groutverbindungen gekommen war, entstand zunehmend der Wunsch, Relativverschiebungen zwischen Pile und Sleeve von Offshore-Windenergieanlagen überwachen zu können, um eine langfristige Beurteilung des Tragverhaltens der Groutverbindung zu ermöglichen. Dies kann bei Grouted Joints im Bereich über Wasser verhältnismäßig einfach durchgeführt werden. Eine große Herausforderung ist hingegen die Messung von Verschiebungen unter Wasser. Nach dem Test eines ersten Prototyps hat das Institut für Baustoffe inzwischen eine verbesserte mobile Messeinheit entwickelt, um diese Messaufgabe realisieren zu können.
description: The connection between the driven pile and the supporting structure of offshore wind turbines has so far been implemented as a grouted joint in over 1000 wind turbines in Germany. After the slipping of grouted connections in numerous monopiles abroad, there was an increasing interest in monitoring relative displacements between pile and sleeve of offshore wind turbines in order to allow a long-term evaluation of the load-bearing behaviour of grouted connections. This can be performed with manageable effort for supporting structures with grouted joints located above water. A major challenge, however, is the measurement of displacements under water. After the test of a first prototype, the Institute of Building Materials Science has now developed an improved mobile measuring unit in order to be able to carry out this measuring task.
Adapting information retrieval to user needs in an evolving web environment
Creators: name: Firan, Claudiu Sergiu
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Information retrieval
subject: personalization
subject: Web 2.0
subject: semantic enrichment
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: [no abstract]
Abnormal brain development in mice with region- and cell-type-specific inactivation of ST8SIA2
Creators: name: Schuster, Ute Elisabeth
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Polysialyltransferase
subject: conditional knockout
subject: interneurons
subject: Konditionaler Knockout
subject: Interneurone
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
The Effects of Powertrain Mechanical Response on the Dynamics and String Stability of a Platoon of Adaptive Cruise Control Vehicles
Creators: name: Davis, L. C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Systems and Control (eess.SY)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The dynamics of a platoon of adaptive cruise control vehicles is analyzed for a general mechanical response of the vehicle's power-train. Effects of acceleration-feedback control that were not previously studied are found. For small acceleration-feedback gain, which produces marginally string-stable behavior, the reduction of a disturbance (with increasing car number n) is found to be faster than for the maximum allowable gain. The asymptotic magnitude of a disturbance is shown to fall off as erf(ct./sq. rt. n) when n goes to infinity. For gain approaching the lower limit of stability, oscillations in acceleration associated with a secondary maximum in the transfer function (as a function of frequency) can occur. A frequency-dependent gain that reduces the secondary maximum, but does not affect the transfer function near zero frequency, is proposed. Performance is thereby improved by elimination of the undesirable oscillations while the rapid disturbance reduction is retained.
description: 16 pages, 10 figures
Comment on "The influence of planetary attractions on the solar tachocline" by Callebaut, de Jager and Duhau
Creators: name: Scafetta, Nicola
name: Humlum, O.
name: Solheim, J. -E.
name: Stordahl, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Geophysics (physics.geo-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Callebaut et al. (2012)'s claim that Scafetta (2010)'s results about a correlation between 20-year and 60-year temperature cycles and the orbital motion of Jupiter and Saturn were not confirmed by Humlum et al. (2011) is erroneous and severely misleading. Also Callebaut et al. (2012)'s absolute claim that a planetary influences on the Sun should be ruled out as a possible cause of solar variability is not conclusive because: (1) their calculations are based on simplistic classical Newtonian analytical mechanics that does not fully characterize solar physics; (2) the planetary theory of solar variation is supported by empirical findings. We show that both claims are already questioned in the scientific literature.
description: 8 pages, 1 figure
Multi-axis inertial sensing with long-time point source atom interferometry
Creators: name: Dickerson, Susannah M.
name: Hogan, Jason M.
name: Sugarbaker, Alex
name: Johnson, David M. S.
name: Kasevich, Mark A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show that light-pulse atom interferometry with atomic point sources and spatially resolved detection enables multi-axis (two rotation, one acceleration) precision inertial sensing at long interrogation times. Using this method, we demonstrate a light-pulse atom interferometer for Rb-87 with 1.4 cm peak wavepacket separation and a duration of 2T = 2.3 seconds. The inferred acceleration sensitivity of each shot is 6.7 * 10^(-12) g, which improves on previous limits by more than two orders of magnitude. We also measure the Earth's rotation rate with a precision of 200 nrad/s.
description: 5 pages, 5 figures
Abundance of pests and diseases in Arabica coffee production systems in Uganda : ecological mechanisms and spatial analysis in the face of climate change
Creators: name: Liebig, Theresa Ines
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Coffee agroforestry system
subject: interdisciplinary research
subject: microclimate
subject: climate change
subject: Hemileia vastatrix
subject: Monochamus leuconotus
subject: Kaffee-Agroforstsysteme
subject: interdisziplinäre Forschung
subject: Mikroklima
subject: Klimawandel
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
The Orthogonal 2D Planes Split of Quaternions and Steerable Quaternion Fourier Transformations
Creators: name: Hitzer, Eckhard
name: Sangwine, Stephen J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Rings and Algebras (math.RA)
subject: Graphics (cs.GR)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: The two-sided quaternionic Fourier transformation (QFT) was introduced in \cite{Ell:1993} for the analysis of 2D linear time-invariant partial-differential systems. In further theoretical investigations \cite{10.1007/s00006-007-0037-8, EH:DirUP_QFT} a special split of quaternions was introduced, then called $\pm$split. In the current \change{chapter} we analyze this split further, interpret it geometrically as \change{an} \emph{orthogonal 2D planes split} (OPS), and generalize it to a freely steerable split of $\H$ into two orthogonal 2D analysis planes. The new general form of the OPS split allows us to find new geometric interpretations for the action of the QFT on the signal. The second major result of this work is a variety of \emph{new steerable forms} of the QFT, their geometric interpretation, and for each form\change{,} OPS split theorems, which allow fast and efficient numerical implementation with standard FFT software.
description: 25 pages, 5 figures
Ermüdungsversuche an großformatigen vorgespannten Betonbalken
Creators: name: Birkner, Dennis
name: Marx, Steffen
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2019
Subjects: subject: Betonermüdung
subject: Lebensdauer
subject: Resonanz
subject: Schädigung
subject: Spannungsumlagerungen
subject: Concrete fatigue
subject: Lifetime
subject: Resonance
subject: Damage
subject: Stress redistributions
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Zur besseren Einschätzung des Ermüdungsverhaltens realer Bauteile sind großformatige Ermüdungsversuche gegenüber Zylinderdruckversuchen geeigneter, da in ihnen Prozesse wie lokale Steifigkeitsänderungen und Spannungsumlagerungen realitätsnäher berücksichtigt werden. In diesem Beitrag wird ein Versuchskonzept für großformatige Betonbalken unter Ermüdungsbeanspruchung vorgestellt. Die geplanten Ermüdungsversuche werden zudem in einem numerischen Modell simuliert. Als Ergebnis der Berechnungen lässt sich ein sukzessiver Schädigungsfortschritt erkennen, der von den Randzonen des Querschnitts in Balkenmitte mit zunehmender Beanspruchungsdauer in das Querschnittsinnere fortschreitet. Infolge der ermüdungsbedingten lokalen Steifigkeitsänderungen kommt es zu Spannungsumlagerungen, sodass die ursprünglich stark beanspruchten Randzonen entlastet werden und sich die Lebensdauer des Bauteils verlängert.
description: For a better assessment of the fatigue behaviour of real structures, large-scale fatigue tests are more suitable than cylinder compression tests, since effects such as local stiffness changes and stress redistributions can be reproduced more realistically. This article presents an experimental setup for large-scale concrete beams subjected to fatigue loading. Additionally, the planned fatigue tests are simulated with a numerical model. The results of the numerical investigations show a successively increasing damage propagating with increasing load cycles from the edges in the middle of the beam into the centre of the cross-section. Stress redistributions occur as a result of local stiffness changes. The initially high stressed edges are relieved and the stresses in the centre of the beam increase, which extends the lifetime of the component.
EFFECTS OF TOURISM ON THE BEHAVIOR AND HEALTH OF RED HOWLER MONKEYS (ALOUATTA SENICULUS) IN SURINAME
Creators: name: Westin, Jessica Lynn
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Mammalia
Chiroptera
Chordata
Animalia
bats
bat

description: (Uploaded by Plazi for the Bat Literature Project) No abstract provided.
Dynamic criticality assessment as a supporting tool for knowledge retention to increase the efficiency and effectiveness of maintenance
Creators: name: Passath, Theresa
name: Huber, Cornelia
name: Biedermann, Hubert
Publisher: name: Hannover : publish-Ing.
Year: 2020
Subjects: subject: Criticality assessment
subject: Knowledge Management
subject: Lean Smart Maintenance
subject: Digitalisation
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Digitalisation offers industrial companies a multitude of opportunities and new technologies (e.g. Big Data Analytics, Cloud Computing, Internet of Things), but it still poses a great challenge for them. Especially the choice of the maintenance strategy, the increasing complexity and level of automation of assets and asset components have a decisive influence. Due to technological progress and the new possibilities offered by industry 4.0, the interaction of different systems and assets is essential to increase the efficiency of the maintenance processes within the value-added chain and to guarantee flexibility permanently. These factors lead to an increased importance of a process methodology for a dynamic evaluation of the asset’s condition over the entire life cycle and under changing framework and production conditions. Therefore, legal and environmentally relevant requirements are considered, based on the procedure of HAZOP (IEC 61882), and ensure the traceability of the results and systematically record the asset’s knowledge gained this way so that it is not tied to individual employees, as it is currently the case. The criticality assessment as a basic component of Lean Smart Maintenance, the dynamic learning, and knowledge-oriented maintenance, offers such a holistic, value-added oriented approach. A targeted optimization of the maintenance strategy is possible through automated evaluation of the assets and identification of the most critical ones based on company-specific criteria derived from the success factors of the company and considering all three management levels normative, strategic and operational. By considering the resource knowledge in the maintenance-strategy optimization process and using suitable methodologies of knowledge management based on the prevailing data quality for it, the efficiency and effectiveness are permanently guaranteed in the sense of continuous improvement.
Interplay between lattice and spin states degree of freedom in the FeSe superconductor: dynamic spin state instabilities
Creators: name: Gnezdilov, Vladimir
name: Pashkevich, Yurii G.
name: Lemmens, Peter
name: Wulferding, Dirk
name: Shevtsova, Tatiana
name: Gusev, Alexander
name: Chareev, Dmitry
name: Vasiliev, Alexander
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Polarized Raman-scattering spectra of superconducting, single-crystalline FeSe evidence pronounced phonon anomalies with temperature reduction. A large 6.5% hardening of the B_1g(Fe) phonon mode is attributed to the suppression of local fluctuations of the iron spin state with the gradual decrease of the iron paramagnetic moment. The ab-initio lattice dynamic calculations support this conclusion. The enhancement of the low-frequency spectral weight above the structural phase transition temperature T_s and its change below T_s is discussed in relation with the opening of an energy gap between low (S=0) and higher spin states which prevents magnetic order in FeSe. The very narrow phonon line widths compared to observations in FeTe suggests the absence of intermediate spin states in the fluctuating spin state manifold in FeSe.
description: 9 pages, 5 figures
Self-adjusting process monitoring system in series production
Creators: name: Denkena, Berend
name: Dahlmann, Dominik
name: Damm, J.
Publisher: name: Amsterdam : Elsevier
Year: 2015
Subjects: subject: Intelligent
subject: Monitoring
subject: Process
subject: Errors
subject: Expert systems
subject: Industrial research
subject: Machine tools
subject: Manufacture
subject: Parameterization
subject: Process control
subject: Process monitoring
subject: Processing
subject: Quality control
subject: Signal processing
subject: Tuning
subject: Correlation analysis
subject: Monitoring system
subject: Multi-purpose machines
subject: Process monitoring system
subject: Reference signals
subject: Sensitive features
subject: Series production
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: Modern monitoring systems in machine tools are able to detect process errors promptly. Still, the application of monitoring systems is restricted by the complexity of parameterization for save monitoring. In most cases, only specially trained personnel can handle this job especially for multi-purpose machines. The aim of the research project "Proceed" is to figure out in which extent a self-parameterization and autonomous optimization of monitoring systems in industrial series production can be realized. Therefore, a self-adjusting and self-tuning process monitoring system for series production has been developed. This system is based on multi-criteria sensor signal evaluation and is able to assess its monitoring quality quantitatively. For this purpose, the complete process chain of parameterization has been automated. For series production it is assumed, that the first process is not defective. So, process sensitive features are identified by a correlation analysis with a reference signal. The reference signal is selected through an analysis of the process state by an expert system. To assess the monitoring quality resulting from automatic parameterization, normed specific values were used. These values describe the monitoring quality with the help of the distance between a feature and its threshold normed to signal amplitude and noise. A second indicator is the reaction of the monitoring system to a synthetic error added to signal a sequence. Thus it is possible to estimate monitoring quality corresponding to automatic parameterization. The validation is carried out by a comparison between the result of the assessment and the reaction ability of the monitoring system to real process errors from milling, drilling and turning processes.
Sequential quantum-enhanced measurement with an atomic ensemble
Creators: name: Lebedev, A. V.
name: Treutlein, P.
name: Blatter, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We propose a quantum-enhanced iterative (with $K$ steps) measurement scheme based on an ensemble of $N$ two-level probes which asymptotically approaches the Heisenberg limit $δ_K \propto R^{-K/(K+1)}$, $R$ the number of quantum resources. The protocol is inspired by Kitaev's phase estimation algorithm and involves only collective manipulation and measurement of the ensemble. The iterative procedure takes the shot-noise limited primary measurement with precision $δ_1\propto N^{-1/2}$ to increasingly precise results $δ_K\propto N^{-K/2}$. A straightforward implementation of the algorithm makes use of a two-component atomic cloud of Bosons in the precision measurement of a magnetic field.
description: 5 pages, 1 figure
Creating a Worker-Individual Physical Ability Profile Using a Low-Cost Depth Camera
Creators: name: Brosche, Justus
name: Wackerle, Hannes
name: Lödding, Hermann
Publisher: name: Hannover : publish-Ing.
Year: 2020
Subjects: subject: Ergonomics
subject: Motion Analysis
subject: Intel® RealSense™
subject: 3D Depth Camera
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Assembly workers suffer from long-term damage performing physically intensive tasks due to workstations that are not ergonomically designed for the individual’s needs. Current approaches towards ergonomic improvements of workstations only assess the workstations themselves without taking the individual worker and abilities into account. Therefore, physical limitations, such as age-related loss of range of motion, are not addressed. Work-induced long-term damages result in employee absences, especially of workers close to their pension. Regarding the demographic change, this issue will be even more prevalent in the future. The current approaches, like the functional capacity evaluation, allow movement analysis of individuals, but are too time-consuming to be performed on all workers of a production site. This paper presents a method to assess the individual ability of a worker using a low-cost depth camera with full body tracking to determine the angles between body segments. A set of ergonomic exercises is used to demonstrate relevant abilities for assembly and commissioning tasks. By capturing the motion sequence of these exercises, a physical ability profile can be created with little effort.
Red supergiants and stellar evolution
Creators: name: Ekström, Sylvia
name: Georgy, Cyril
name: Meynet, Georges
name: Groh, Jose
name: Granada, Anahí
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We review the significant role played by red supergiants (RSGs) in stellar populations, and some challenges and questions they raise for theoretical stellar evolution. We present how metallicity and rotation modify the way stars go to the red part of the Hertzsprung- Russell diagram or come back from it, and how RSGs might keep a trace of their main-sequence evolution. We compare theoretical popu- lation ratios with observed ones.
description: 11 pages, 5 figures, Betelgeuse workshop, November 2012, Paris. To be published in the European Astronomical Society Publications Series, editors: Pierre Kervella, Thibaut Le Bertre & Guy Perrin
Academic entrepreneurs : attitudes, careers and growth intentions
Creators: name: Hesse, Nora
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2014
Subjects: subject: Academic entrepreneur
subject: university spin-off growth
subject: career attitude
subject: career path
subject: growth intention
subject: Akademische Gründer
subject: Wachstum universitärer Ausgründungen
subject: Karriereeinstellung
subject: Karrierepfad
subject: Wachstumseinstellung
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft

description: [no abstract]
Method to Automatically Create an Initial Layout for a Production System
Creators: name: Bartelt, Matthias
name: Katzwinkel, Fabian
name: Kuhlenkötter, Bernd
Publisher: name: Hannover : publish-Ing.
Year: 2020
Subjects: subject: Facility layout problem
subject: Design pattern
subject: 3D layout
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: A well-proven means to automate processes are industrial robots. Nevertheless, there are still many processes that are not automated, especially in small and medium sized companies. A main reason is a missing automatism to create suitable solutions. To meet this challenge, the ROBOTOP research project tries to find a list of appropriate components and arrange them in a suitable layout. This paper addresses the second step and an algorithm is described that generates a suitable layout. Thereby, a main aim is to generate a layout that is plausible to the user. The problem relates to the facility layout problem and the proposed algorithm is also applicable to non-robotic related tasks. However, current methods do not yield to an appropriate, because due to the simplifications of the used models a manual effort is required when transforming the model to a 3D scene. The algorithms accepts a description of the process and identifies different kind of patterns. For each kind of pattern, layout rules are defined. With this, the model can be transformed to a plausible 3D setup.
title: Das Ausstellungsprojekt für 1985. 10. Mai bis 25. August 1985. Leben und Arbeiten im Industriezeitalter. Eine Ausstellung zur Wirtschafts- und Sozialgeschichte Bayerns seit 1850. Technik und Kommunikation: Wirklichkeiten aus zweiter Hand.
Creators: name: Gortner, Ernst
Publisher: name: University Library Heidelberg
Year: 2015

description: [nicht vorhanden / not available]
A methodology for simulation production systems considering the degree of autonomy
Creators: name: Voit, Patrick
name: Beller, Marie
name: Reinhart, Gunther
Publisher: name: Hannover : publish-Ing.
Year: 2020
Subjects: subject: Simulation Modelling Methodology
subject: Autonomous Production Systems
subject: Agent-based Simulation
subject: Factory Planning
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: The increasing number of product varieties and declining product life cycles combined with individualised customer behaviour demand flexible and efficient production systems. A proper solution approach can be the use of intelligent technologies, capable of autonomous processing in order to react rapidly to changing requirements. However, production planners need a profound planning approach for the implementation of such technologies in production systems due to their cost intense investments. Therefore, simulation studies are suitable means for the analysis of a proper degree of autonomy in production systems. An appropriate methodology for the simulation of such systems is presented in this paper. The methodology is aligned with common guidelines on simulation studies and focuses on system analysis, formalisation and simulation. It is based on consistent methods – fact sheets and Value Stream Design for system analysis, Unified Modelling Language (UML) diagrams for formalisation and agent-based simulation. A central contribution to current research is the modular modelling of intelligence skills in production resources and parts in a simulation environment. Consequently, the developed methodology provides a basis for the implementation of simulation experiments in order to facilitate the evaluation of the economically efficient use of intelligent objects in production systems.
Comment on "Witnessed entanglement and the geometric measure of quantum discord"
Creators: name: Rana, Swapan
name: Parashar, Preeti
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In a recent article [Phys. Rev. A 86, 024302 (2012)], the authors have derived some hierarchy relations between geometric discord and entanglement (measured by negativity and its square). We point out that these results are incorrect and give analytic counterexamples. We also discuss briefly the reason for such violations.
description: 1+ page, Accepted in PRA
Acoustic variability and its biological significance in nocturnal lemurs
Creators: name: Braune, Pia
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Microcebus
subject: Lepilemur
subject: acoustic communication
subject: Dewey Decimal Classification::500 | Naturwissenschaften::590 | Tiere (Zoologie)

description: [no abstract]
Lycopodium alpinum L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: L. alpinum L. Cat. 411 und 433. l: La Creuse (J.); Barberine (Exk. Soc. Murith.). - 3: Bei Sembrancher (Melly); Fionnay (J.); zwischen Vingt-Huit und Lancey (J.); Pointe de Zirouc (Zimmermann). - 3a: Ob Gondo (Joller). - 4: «Seewji» ob Termen, 2200m (Terretaz); Maienbiel im Binntal (B. Fischer).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556