cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The origin of blue-shifted absorption features in the X-ray spectrum of PG 1211+143: Outflow or disc?
Creators: name: Gallo, L. C.
name: Fabian, A. C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In some radio-quiet active galaxies (AGN), high-energy absorption features in the x-ray spectra have been interpreted as Ultrafast Outflows (UFOs) -- highly ionised material (e.g. Fe XXV and Fe XXVI) ejected at mildly relativistic velocities. In some cases, these outflows can carry energy in excess of the binding energy of the host galaxy. Needless to say, these features demand our attention as they are strong signatures of AGN feedback and will influence galaxy evolution. For the same reason, alternative models need to be discussed and refuted or confirmed. Gallo & Fabian proposed that some of these features could arise from resonance absorption of the reflected spectrum in a layer of ionised material located above and corotating with the accretion disc. Therefore, the absorbing medium would be subjected to similar blurring effects as seen in the disc. A priori, the existence of such plasma above the disc is as plausible as a fast wind. In this work, we highlight the ambiguity by demonstrating that the absorption model can describe the ~7.6 keV absorption feature (and possibly other features) in the quasar PG 1211+143, an AGN that is often described as a classic example of an UFO. In this model, the 2-10 keV spectrum would be largely reflection dominated (as opposed to power law dominated in the wind models) and the resonance absorption would be originating in a layer between about 6 and 60 gravitational radii. The studies of such features constitutes a cornerstone for future X-ray observatories like Astro-H and Athena+. Should our model prove correct, or at least important in some cases, then absorption will provide another diagnostic tool with which to probe the inner accretion flow with future missions.
description: 4 pages. Accepted for publication in MNRAS Letters
Episodic Explosions in Interstellar Ices
Creators: name: Rawlings, J. M. C.
name: Williams, D. A.
name: Viti, S.
name: Cecchi-Pestellini, C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a model for the formation of large organic molecules in dark clouds. The molecules are produced in the high density gas-phase that exists immediately after ice mantles are explosively sublimated. The explosions are initiated by the catastrophic recombination of trapped atomic hydrogen. We propose that, in molecular clouds, the processes of freeze-out onto ice mantles, accumulation of radicals, explosion and then rapid (three-body) gas-phase chemistry occurs in a cyclic fashion. This can lead to a cumulative molecular enrichment of the interstellar medium. A model of the time-dependent chemistries, based on this hypothesis, shows that significant abundances of large molecular species can be formed, although the complexity of the species is limited by the short expansion timescale in the gas, immediately following mantle explosion. We find that this mechanism may be an important source of smaller organic species, such as methanol and formaldehyde, as well as precursors to bio-molecule formation. Most significantly, we predict the gas-phase presence of these larger molecular species in quiescent molecular clouds and not just dynamically active regions, such as hot cores. As such the mechanism that we propose complements alternative methods of large molecule formation, such as those that invoke solid-state chemistry within activated ice mantles.
description: 11 pages, 2 figures
title: Produktivität vs. Termintreue: Logistikorientierte Auftragsreihenfolgebildung für mehrstufige Produktionsprozesse
title: Productivity versus schedule compliance – Logistics-oriented order sequencing for multi-stage production processes
titleType: AlternativeTitle
Creators: name: Seitz, Melissa
name: Mayer, Jonas
name: Mütze, Alexander
name: Nyhuis, Peter
Publisher: name: Düsseldorf : VDI fachmedien
Year: 2019
Subjects: subject: Produktionsplanung und -steuerung
subject: Reihenfolgebildung
subject: Fertigungsmanagement
subject: Fertigungssteuerung
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Die logistische Leistungsfähigkeit und Wirtschaftlichkeit einer Produktion werden durch die Auftragsreihenfolgebildung beeinflusst. Mathematische Modelle zur Beschreibung der Auswirkungen verschiedener Reihenfolgeregeln auf logistische Zielgrößen einzelner Arbeitssysteme können zur Ableitung von Reihenfolgestrategien für mehrstufige Produktionen genutzt werden. Die Festlegung der Strategie erfolgt dabei durch eine bewusste Positionierung im Spannungsfeld zwischen Produktivität und Termintreue.
description: The logistical performance and economic efficiency of a production are influenced by order sequencing. Mathematical models to describe the effects of different sequencing rules on logistic target variables of individual workstations may be used to derive sequencing-strategies for multi- stage productions. The strategy is defined by conscious positioning in the field of tension between productivity and schedule compliance.
Trajectory Optimization for the Handling of Elastically Coupled Objects via Reinforcement Learning and Flatness-Based Control
Creators: name: Kaczor, Daniel
name: Bensch, Martin
name: Schappler, Moritz
name: Ortmaier, Tobias
Publisher: name: Berlin : Springer Vieweg
Year: 2020
Subjects: subject: flatness-based control
subject: reinforcement learning
subject: double deep Q-network
subject: trajectory optimization
subject: oscillation reduction
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Positioning objects in industrial handling applications is often compromised by elasticity-induced oscillations reducing the possible motion time and thereby the performance and profitability of the automation solution. Existing approaches for oscillation reduction mostly focus on the elasticity of the handling system itself, i.e. the robot structure. Depending on the task, elastic parts or elastic grippers like suction cups strongly influence the oscillation and prevent faster positioning. In this paper, the problem is investigated exemplarily with a typical handling robot and an additional end effector setup representing the elastic load. The handling object is modeled as a base-excited spring and mass, making the proposed approach independent from the robot structure. A model-based feed-forward control based on differential flatness and a machine-learning method are used to reduce oscillations solely with a modification of the end effector trajectory of the robot. Both methods achieve a reduction of oscillation amplitudes of 85% for the test setup, promising a significant increase in performance. Further investigations on the uncertainty of the parameterization prove the applicability of the not yet widely-used learning approach in the field of oscillation reduction.
Supporting Explainable AI on Semantic Constraint Validation
Creators: name: Gercke, Julian Alexander
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität
Year: 2022
Subjects: subject: Artificial Intelligence
subject: Explainable AI
subject: Semantic Constraint Validation
subject: Machine Learning
subject: Decision Trees
subject: SHACL
subject: Künstliche Intelligenz
subject: SPARQL
subject: Maschinelles Lernen
subject: Entscheidungsbäume
subject: Integritätsconstraints
subject: Validierung
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: There is a rising number of knowledge graphs available published through various sources. The enormous amount of linked data strives to give entities a semantic context. Using SHACL, the entities can be validated with respect to their context. On the other hand, an increasing usage of AI models in productive systems comes with a great responsibility in various areas. Predictive models like linear, logistic regression, and tree-based models, are still frequently used as they come with a simple structure, which allows for interpretability. However, explaining models includes verifying whether the model makes predictions based on human constraints or scientific facts. This work proposes to use the semantic context of the entities in knowledge graphs to validate predictive models with respect to user-defined constraints; therefore, providing a theoretical framework for a model-agnostic validation engine based on SHACL. In a second step, the model validation results are summarized in the case of a decision tree and visualized model-coherently. Finally, the performance of the framework is evaluated based on a Python implementation.
Engineering Dissipative Quasicrystals
Creators: name: Li, Tianyu
name: Zhang, Yong-Sheng
name: Yi, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss the systematic engineering of quasicrystals in open quantum systems where quasiperiodicity is introduced through purely dissipative processes. While the resulting short-time dynamics is governed by non-Hermitian variants of the Aubry-Andre-Harper model, we demonstrate how phases and phase transitions pertaining to the non-Hermitian quasicrystals fundamentally change the long-time, steady-state-approaching dynamics under the Lindblad master equation. Our schemes are based on an exact mapping between the eigenspectrum of the Liouvillian superoperator with that of the non-Hermitian Hamiltonian, under the condition of quadratic fermionic systems subject to linear dissipation. Our work suggests a systematic route toward engineering exotic quantum dynamics in open systems, based on insights of non-Hermitian physics.
description: 9 pages, 4 figures
Numerical Simulation of Heat Transfer and Fluid Flow in Additively Manufactured Plate-Fin Heat Exchangers with Wavy Fins
Creators: name: Al-Azzawi, Huda Jasim Mohammed
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2021
Subjects: subject: Plate-Fin Heat Exchanger
subject: Wavy fin
subject: Fin amplitude
subject: Plattenrippen-Wärmeübertragern (PFHE)
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: The heat transfer is considered to be one of the most important industrial processes as seen in all these opulent applications in energy conversion and in chemical industry. This thesis presents a CFD numerical simulation of heat transfer and fluid flow in plate-fin heat exchangers (PFHE) design to predict the fluid friction and heat transfer characteristics, and we investigate in detail the effect of longitudinal heat conduction effects using the open source CFD code OpenFOAM. Numerical tests for both the hot and cold fluid in the laminar flow regime ranging between 50 ≤ Re ≤ 2000 of the Reynolds number with different cases of geometrical parameters of the fin were performed (1, 1.1 and 1.2 mm in fin spacing; 0, 1.5, 2 and 2.5 mm in fin amplitude; 65, 100, 130 and 195 mm in fin length). The results for each case of the wavy fin with variation in fin amplitude are presented by means of a Colburn j factor and the Fanning friction factor f. The results reveal that the longitudinal heat conduction in the fins and the plates itself has a significant influence on the heat transfer performance in all cases. The CFD results are compared with available correlations in the literatures for Shah and London [1] and Chennu [2]. We also find that the available correlations for wavy fins are not suitable for the general case of the variable geometrical parameters to predict the heat transfer and pressure drop, particularly when the amplitude of the fins is small. Therefore, we have developed new correlations which extend the application range also for small fin amplitudes. Three models are presented for evaluation the heat transfer coefficient within a given range. A good agreement between the new correlations and analytical and numerical models are shown in this thesis. The CFD data of the single pair of wavy channels in the plate-fin heat exchanger were validated with the experimental data. The heat transfer performance data for both the experimental and CFD numerical results were obtained at the inlet gas temperature, ranging (1023-840 K) for hot gas, and for cold gas ranging between 523-476 K. The experimental and numerical results are validated by the available literatures from Chennau [11], Junqi et al. [13], and new correlations which illustrate a sufficiently good agreement with our results.
Near Constant Loss in Glassy and Crystalline LiAlSi2O6 from Conductivity Relaxation Measurements
Creators: name: Rizos, Apostolos K.
name: Alifragis, J.
name: Ngai, K.L.
name: Heitjans, Paul
Publisher: name: College Park, MA : American Institute of Physics (AIP)
Year: 2001
Subjects: subject: glassy ionic conductors
subject: near constant loss
subject: constant loss
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: Polycrystalline and glassy LiAlSi2O6 are studied by dielectric relaxation measurements for the purpose of characterizing the nearly frequency independent contribution to the dielectric loss (near constant loss), which is commonly found in glassy ionic conductors independent of the chemical and physical structures. The data show the near constant loss is present in both the polycrystalline and glassy states of LiAlSi2O6. Further, its magnitude and temperature dependence is comparable in both forms of the same substance. The implications of these findings on the mechanism that gives rise to the near constant loss are discussed.
Investigation of Rotational Splitting in the Pulsating White Dwarf GD 154
Creators: name: Bognar, Zsofia
name: Paparo, Margit
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We observed the ZZ Ceti star GD 154 over a whole season at the mountain station of Konkoly Observatory. Our long time base allowed to detect the sign of rotational triplets around the independent modes. To check whether these can be real detections we made a test on our data set. We searched for characteristic spacing values performing Fourier analysis of numerous peaks determined around five frequencies in the main pulsation region. The analysis revealed regular peak spacings with separations around 3.7 and 2.6 microHz. These values are in accordance with the ones determined by consecutive prewhitening of Whole Earth Telescope observations.
description: Proceedings of the "20th Stellar Pulsation Conference Series: Impact of new instrumentation & new insights in stellar pulsations", 5-9 September 2011, Granada, Spain
Loss of anisotropy in strained ultrathin epitaxial L10 Mn-Ga films
Creators: name: Köhler, Albrecht
name: Knez, Ivan
name: Ebke, Daniel
name: Felser, Claudia
name: Parkin, Stuart S. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this work we are investigating the effect of strain in ultrathin Mn-Ga thin films on the magnetic properties at room temperature. Two different Mn-Ga compositions of which one is furthermore doped with Co were grown on Cr buffered MgO (001) substrates. Films with a thickness below 12nm are highly strained and it was observed that the ratio c/a vs. thickness is depending on composition. Using c/a as an order parameter the PMA is shown to be drastically reduced with increasing strain. These findings should be considered when generalizing and downscaling results obtained from films >20nm. Furthermore it has been shown, that the strain can be reduced by introducing an additional Pt buffer and thus maintaining a high PMA for a thickness as low as 6nm.
Zum Begriff der wissenschaftlichen Arbeit im "Kapital"
Creators: name: Bensch, Hans-Georg
Publisher: name: Hamburg : Argument
Year: 2002
Subjects: subject: Wissenschaftliche Arbeit
subject: allgemeine Arbeit
subject: handwerksbasiert
subject: erkenntnisbasiert
subject: akkumulativ
subject: gebrauchswertbildend
subject: Produktion des relativen Mehrwerts
subject: fremde Wissenschaft
subject: Scientific labour
subject: general labour
subject: handicraft in contrast to scientific
subject: accumulative
subject: produces use-value
subject: Production of relative Surplus-Value
subject: Dewey Decimal Classification::100 | Philosophie
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie

description: Im "Kapital" taucht der Begriff der wissenschaftlichen Arbeit nur am Rande auf, obwohl die wissenschaftliche Arbeit für die Produktion des relativen Mehrwerts entscheidend ist. Welche Implikationen dieser Begriff hat und warum die wissenschaftliche Arbeit wesentlich gebrauchswertbildend aber nicht wertbildend ist, kann anhand der Marxschen Bestimmungen im "Kapital" deutlich gemacht werden.
Liebig's Extract of Meat Company's trade card on Lamas near prayer wheels
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2020
Subjects: Tibetans
Meat extract

description: Advertisement for Liebig's Extract of Meat Company featuring a picture of Lamas near a prayer mill with the following description: Lhasa, Heilige Stad Van Het Lamaïsme. 5. Gebedsmolens en typen van Lama's. Liebig Producten: bezuinigend gebruik.
Atoms in the p-localization of stable homotopy category
Creators: name: Drozd, Yuriy A.
name: Kolesnyk, Petro O.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 55P15, 55P42, 55P60

description: We study $p$-localizations, where $p$ is an odd prime, of the full subcategories $S^n$ of stable homotopy category consisting of CW-complexes having cells in $n$ successive dimensions. Using the technique of triangulated categories and matrix problems we classify atoms (indecomposable objects) in $S_p^n$ for $n\le 4(p-1)$ and show that for $n>4(p-1)$ such classification is wild in the sense of the representation theory.
description: 16 pages
The Higgs decay rate to two photons in a model with two fermiophobic-Higgs doublets
Creators: name: Cárdenas, H.
name: Machado, A. C. B.
name: Pleitez, V.
name: Rodriguez, J. -Alexis
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider a three Higgs doublet model with an $S_3$ symmetry in which beside the SM-like doublet there are two fermiophobic doublets. Due to the new charged scalars there is an enhancement in the two-photon decay while the other channels have the same decay widths that the SM neutral Higgs. The fermiophobic scalars are mass degenerated unless soft terms breaking the $S_3$ symmetry are added.
description: typos were corrected, the figures have been modified and the conclusions were increased. Still contains 15 pages, 2 figures
Standardisierbare Verfahren zur präuisen Charakterisierung des Absorptions-, Reflexions- und Tranmissionsgrads optischer Komponenten
Creators: name: Willamowski, Uwe
Publisher: name: Hannover : Universität
Year: 1999
Subjects: subject: Standardisations
subject: absorptance
subject: reflectance
subject: transmittance
subject: optical characterisation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Induktion einer TH1-Reaktion nach Stimulation von dendritischen Zellen mit MALP-2 und IFN-[gamma] in einem in vitro Allergiemodell
Creators: name: Weigt, Henning
Publisher: name: Hannover : Universität
Year: 2003
Subjects: subject: Dendritic cells
subject: allergy
subject: MALP-2
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Geometric structures on moment-angle manifolds
Creators: name: Panov, Taras
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Topology (math.AT)
subject: Complex Variables (math.CV)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: The moment-angle complex Z_K is cell complex with a torus action constructed from a finite simplicial complex K. When this construction is applied to a triangulated sphere K or, in particular, to the boundary of a simplicial polytope, the result is a manifold. Moment-angle manifolds and complexes are central objects in toric topology, and currently are gaining much interest in homotopy theory, complex and symplectic geometry. The geometric aspects of the theory of moment-angle complexes are the main theme of this survey. We review constructions of non-Kahler complex-analytic structures on moment-angle manifolds corresponding to polytopes and complete simplicial fans, and describe invariants of these structures, such as the Hodge numbers and Dolbeault cohomology rings. Symplectic and Lagrangian aspects of the theory are also of considerable interest. Moment-angle manifolds appear as level sets for quadratic Hamiltonians of torus actions, and can be used to construct new families of Hamiltonian-minimal Lagrangian submanifolds in a complex space, complex projective space or toric varieties.
description: 60 pages
Fast global null controllability for a viscous Burgers' equation despite the presence of a boundary layer
Creators: name: Marbach, Frédéric
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 93B05, 93C10 (Primary)

description: In this work, we are interested in the small time global null controllability for the viscous Burgers' equation y_t - y_xx + y y_x = u(t) on the line segment [0,1]. The second-hand side is a scalar control playing a role similar to that of a pressure. We set y(t,1) = 0 and restrict ourselves to using only two controls (namely the interior one u(t) and the boundary one y(t,0)). In this setting, we show that small time global null controllability still holds by taking advantage of both hyperbolic and parabolic behaviors of our system. We use the Cole-Hopf transform and Fourier series to derive precise estimates for the creation and the dissipation of a boundary layer.
Mechanismen der Persistenz von Chlamydia trachomatis und Chlamydophila pneumoniae in humanen monozytären und epithelialen Zellen
Creators: name: Krauße-Opatz, Birgit
Publisher: name: Hannover : Universität
Year: 2003
Subjects: subject: Chlamydia trachomatis
subject: Chlamydophila pneumoniae
subject: persistence
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Bedeutung der Rezeptor-vermittelten Apoptose und Aufklärung der intrazellulären Signalkaskade in Helicobacter pylori-induzierten, humanen Magenepithelzellen
Creators: name: Ledig, Susanne
Publisher: name: Hannover : Universität
Year: 2003
Subjects: subject: Helicobacter pylori
subject: apoptosis
subject: death-receptors
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Time dilation in relativistic two-particle interactions
Creators: name: Shields, B. T.
name: Morris, M. C.
name: Ware, M. R.
name: Su, Q.
name: Stefanovich, E. V.
name: Grobe, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We study the orbits of two interacting particles described by a fully relativistic classical mechanical Hamiltonian. We use two sets of initial conditions. In the first set (dynamics 1) the system's center of mass is at rest. In the second set (dynamics 2) the center of mass evolves with velocity V. If dynamics 1 is observed from a reference frame moving with velocity -V, the principle of relativity requires that all observables must be identical to those of dynamics 2 seen from the lab frame. Our numerical simulations demonstrate that kinematic Lorentz space-time transformations fail to transform particle observables between the two frames. This is explained as a result of the inevitable interaction-dependence of the boost generator in the instant form of relativistic dynamics. In spite of general inaccuracies of Lorentz formulas, the orbital periods are correctly predicted by the Einstein's time dilation factor for all interaction strengths.
description: 14 pages, 1 figure
Die Struktur der bodennahen Atmosphäre : ein Vergleich zwischen numerischer Modellierung und akustischer Tomographie
Creators: name: Weinbrecht, Sonja
Publisher: name: Hannover : Universität
Year: 2003
Subjects: subject: LES
subject: model evaluation
subject: acoustic tomography
subject: atmospheric surface layer
subject: coherent structures
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: [no abstract]
On simply connected K-contact non-Sasakian manifolds
Creators: name: Hajduk, Boguslaw
name: Tralle, Aleksy
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53D05

description: We solve the problem posed by Boyer and Galicki about the existence of K-contact simply connected manifolds with no Sasakian structure. Although the result lies in the framework of metric contact geometry, our methods come from contact and symplectic geometry and are based on the method of fat bundles developed by Sternberg, Weinstein and Lerman.
Controlling Enzymatic Activity by Modulating the Oligomerization State via Chemical Rescue and Optical Control
Creators: name: Kropp, Cosimo
name: Bruckmann, Astrid
name: Babinger, Patrick
Publisher: name: Universität Regensburg
Year: 2021
Subjects: subject: biocatalysis, chemical rescue, oligomerization, optochemical tools, protein-protein interactions
subject: 570 Biowissenschaften, Biologie

description: Selective switching of enzymatic activity has been a longstanding goal in synthetic biology. Drastic changes in activity upon mutational manipulation of the oligomerization state of enzymes have frequently been reported in the literature, but scarcely exploited for switching. Using geranylgeranylglyceryl phosphate synthase as a model, we demonstrate that catalytic activity can be efficiently controlled by exogenous modulation of the association state. We introduced a lysine-to-cysteine mutation, leading to the breakdown of the active hexamer into dimers with impaired catalytic efficiency. Addition of bromoethylamine chemically rescued the enzyme by restoring hexamerization and activity. As an alternative method, we incorporated the photosensitive unnatural amino acid o-nitrobenzyl-O-tyrosine (ONBY) into the hexamerization interface. This again led to inactive dimers, but the hexameric state and activity could be recovered by UV-light induced cleavage of ONBY. For both approaches, we obtained switching factors greater than 350-fold, which compares favorably with previously reported activity changes that were caused by site-directed mutagenesis.
Untersuchung zur Regulation von Signaltransduktion und Genexpression während der Entzündung auf der Ebene der Proteinkinase TAK1
Creators: name: Thiefes, Axel
Publisher: name: Hannover : Universität
Year: 2003
Subjects: subject: TGF-beta activated kinase (TAK1)
subject: signal transduction
subject: inflammation
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Beitrag zum Präzisionsschmieden von Zahnrädern für Pkw-Getriebe
Creators: name: Silbernagel, Claus
Publisher: name: Hannover : Universität
Year: 2003
Subjects: subject: Precision forging
subject: gear-wheel
subject: coupling gear tooth
subject: car transmission
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: [no abstract]
Coherent Propagation of Spin Helices in a Quantum-Well Confined Electron Gas
Creators: name: Yang, Luyi
name: Koralek, J. D.
name: Orenstein, J.
name: Tibbetts, D. R.
name: Reno, J. L.
name: Lilly, M. P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We use phase-resolved transient grating spectroscopy to measure the propagation of spin helices in a high mobility $n$-GaAs/AlGaAs quantum well with an applied in-plane electric field. At relatively low fields helical modes crossover from overdamped excitations where the spin-precession period exceeds the spin lifetime, to a regime of coherent propagation where several spin-precession periods can be observed. We demonstrate that the envelope of a spin polarization packet reaches a current-driven velocity of 10$^7$ cm s$^{-1}$ in an applied field of 70 V cm$^{-1}$.
Entanglement generation in relativistic cavity motion
Creators: name: Bruschi, David Edward
name: Louko, Jorma
name: Faccio, D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We analyse particle creation and mode mixing for a quantum field in an accelerated cavity, assuming small accelerations but allowing arbitrary velocities, travel times and travel distances, and in particular including the regime of relativistic velocities. As an application, we identify a desktop experimental scenario where the mode mixing resonance frequency in linear sinusoidal motion or in uniform circular motion is significantly below the particle creation resonance frequencies of the Dynamical Casimir Effect, and arguably at the threshold of current technology. The mode mixing acts as a beamsplitter quantum gate, experimentally detectable not only via fluxes or particle numbers but also via entanglement generation.
description: 8 pages, LaTeX with jpconf. Submitted to DICE2012 proceedings
Entwicklung eines Einweg-Photobioreaktorsystems zur Hochdurchsatzuntersuchung (Screening) von Mikroalgen
Creators: name: Menke, Sebastian
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2013
Subjects: subject: Microalgae
subject: high throughput screeningsystem
subject: disposable photobioreactor
subject: Mikroalgen
subject: Hochdurchsatz-Screening-System
subject: Einweg-Photobioreaktor
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
What Neuroscience in the Anthropocene era?
Creators: name: Lefevre, Julien
name: Schön, Daniele
name: Mercier, Manuel
name: Zaaraoui, Wafaa
name: Castets, Francis
name: Lenck Santini, Pascal
name: Greetham, Louise
name: Besson, Mireille
name: Gaunet, Florence
Publisher: name: Zenodo
Year: 2023

description: This is the text of a interdisciplinary project proposal, as submitted in February 2022 to the call Interdisciplinarité Amidex: 
https://www.univ-amu.fr/fr/public/lancement-de-lappel-projets-interdisciplinarite-2021
description: Recently, we have seen a dramatic increase of initiatives from the scientific community aimed to warn of the environmental disasters. Neuroscience can actively contribute to a better understanding of both the processes that led our society to become the way it is, and the psychological and neurophysiological processes allowing a change in habits. Moreover, neuroscientists need to carefully consider whether and how to adapt to the climate crisis, in terms of research topics, research practices and educational curricula.
The project aims at:

redefining neuroscientific questions that may be relevant for understanding the actual crisis as well as suggesting new directions
structuring a series of interdisciplinary meetings bringing their perspective on neuroscience at the era of Anthropocene
adopting a collective vision and engaging in a discussion about the future of the community with respect to the climate crisis
improving scientific practices in respect of environmental issues
9 Laboratories out of 9 of the NeuroMarseille community are represented in the current project, with a great diversity of disciplines and professional profiles. This project will 1) foster a structuring effort on an innovative and relevant topic 2) ignite a transformation of scientific practices and education, respectful of both environmental and socio-economic challenges 3) increase the dynamics of the NeuroMarseille Institute in terms of innovative and transdisciplinary research lines.
Untersuchungen zum Auftreten und der Interaktion von Zuckerrüben-Blattkrankheiten am Beispiel von Cercospora-Blattflecken (Cercospora beticola), Rübenmehltau (Erysiphe betae) und Rübenrost (Uromyces betae) unter dem Einfluss des Klimawandels
Creators: name: Richerzhagen, Dominique
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2013
Subjects: subject: Sugar beet leaf diseases
subject: interaction
subject: Lotka-Volterra model
subject: climate change
subject: Zuckerrüben-Blattkrankheiten
subject: Interaktion
subject: Lotka-Volterra-Modell
subject: Klimawandel
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
Multi-target tracking algorithms in 3D
Creators: name: Telgarsky, Rastislav
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences
subject: G.4; I.2.10; I.4.7; I.4.8; I.4.9; I.5.3
subject: 65D18, 68W05

description: Ladars provide a unique capability for identification of objects and motions in scenes with fixed 3D field of view (FOV). This paper describes algorithms for multi-target tracking in 3D scenes including the preprocessing (mathematical morphology and Parzen windows), labeling of connected components, sorting of targets by selectable attributes (size, length of track, velocity), and handling of target states (acquired, coasting, re-acquired and tracked) in order to assemble the target trajectories. This paper is derived from working algorithms coded in Matlab, which were tested and reviewed by others, and does not speculate about usage of general formulas or frameworks.
description: 7 pages, 2 figures, conference proceedings
Haut und Licht. Freund oder Feind?
Creators: name: Enk, Alexander
name: Hänßle, Holger
Publisher: name: Ruperto Carola
Year: 2015

description: Wo Licht ist, da ist auch Schatten – das gilt insbesondere für den Einfluss des Lichts auf die menschliche Haut. Sonnenlicht ist wichtig für unser Wohlbefinden, es sorgt dafür, dass die Haut lebenswichtiges Vitamin D produzieren kann und stimuliert unser Immunsystem. Licht kann die Haut aber auch schwer schädigen und Erkrankungen bis hin zum gefürchteten schwarzen Hautkrebs entstehen lassen. Aktuelle Forschungsarbeiten der Heidelberger Universitäts-Hautklinik gehen den bislang noch weitgehend unbekannten Effekten des Lichts auf das Immunsystem nach und prüfen neue Methoden zur besseren Diagnose und Therapie von Hauterkrankungen.
description: Ruperto Carola, Nr. 7 (2015): Schatten & Licht
Time-delay interferometry simulations for the laser interferometer space antenna
Creators: name: Otto, Markus
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Gravitational waves
subject: time-delay interferometry
subject: LISA simulation
subject: Gravitationswellen
subject: LISA-Simulation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Optimization by Record Dynamics
Creators: name: Barettin, Daniele
name: Sibani, Paolo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Large dynamical changes in thermalizing glassy systems are triggered by trajectories crossing record sized barriers, a behavior revealing the presence of a hierarchical structure in configuration space. The observation is here turned into a novel local search optimization algorithm dubbed Record Dynamics Optimization, or RDO. RDO uses the Metropolis rule to accept or reject candidate solutions depending on the value of a parameter akin to the temperature, and minimizes the cost function of the problem at hand through cycles where its `temperature' is raised and subsequently decreased in order to expediently generate record high (and low) values of the cost function. Below, RDO is introduced and then tested by searching the ground state of the Edwards-Anderson spin-glass model, in two and three spatial dimensions. A popular and highly efficient optimization algorithm, Parallel Tempering (PT) is applied to the same problem as a benchmark. RDO and PT turn out to produce solution of similar quality for similar numerical effort, but RDO is simpler to program and additionally yields geometrical information on the system's configuration space which is of interest in many applications. In particular, the effectiveness of RDO strongly indicates the presence of the above mentioned hierarchically organized configuration space, with metastable regions indexed by the cost (or energy) of the transition states connecting them.
description: 14 pages, 12 figures
Non-classical states of matter in spinor Bose-Einstein condensates
Creators: name: Peise, Jan Christopher
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Bose-Einstein condensate
subject: spin dynamics
subject: entanglement
subject: Einstein-Podolsky-Rosen correlation
subject: quantum Zeno effect
subject: interaction-free measurements
subject: Bose-Einstein-Kondensat
subject: Spindynamik
subject: Verschränkung
subject: Einstein-Podolsky-Rosen-Korrelationen
subject: Quanten-Zeno-Effekt
subject: wechselwirkungsfreie Quantenmessungen
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Determination of the Entropy via Measurement of the Magnetization: Application to the Spin ice Dy2Ti2O7
Creators: name: Bovo, L.
name: Bramwell, S. T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The residual entropy of spin ice and other frustrated magnets is a property of considerable interest, yet the usual way of determining it, by integrating the heat capacity, is generally ambiguous. Here we note that a straightforward alternative method based on Maxwell's thermodynamic relations can yield the residual entropy on an absolute scale. The method utilises magnetization measurements only and hence is a useful alternative to calorimetry. We confirm that it works for spin ice, Dy2Ti2O7, which recommends its application to other systems. The analysis described here also gives an insight into the dependence of entropy on magnetic moment, which plays an important role in the theory of magnetic monopoles in spin ice. Finally, we present evidence of a field-induced crossover from correlated spin ice behaviour to ordinary paramagnetic behaviour with increasing applied field, as signalled by a change in the effective Curie constant.
description: 10 pages, 5 figures. Manuscript submitted. second version, few minor errors amended
Aktuelle Herausforderungen der privaten Krankenversicherung in Deutschland
Creators: name: Schwarzbach, Christoph
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Private health insurance
subject: dementia
subject: care
subject: cost-effectiveness analysis
subject: insurance intermediation
subject: Private Krankenversicherung
subject: Demenz
subject: Pflege
subject: Kosten-Effektivitätsanalysen
subject: Versicherungsvermittlung
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::360 | Soziale Probleme, Sozialdienste, Versicherungen
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft

description: [no abstract]
title: Query AutoAwesome
Creators: name: Suryavanshi, Chetna
Publisher: name: Utah State University
Year: 2019

description: This research investigates how to improve legacy queries. Legacy queries are queries that programmers have coded and are used in applications. A database application typically has tens to hundreds of such queries. One way to improve legacy queries is to add new, interesting queries that are similar to or based on the set of queries. We propose Query AutoAwesome, a tool to generate new queries from legacy queries. The Query AutoAwesome philosophy is taken from Google’s AutoAwesomizer tool for photos, which automatically improves a photo uploaded to Google by animating the photo or adding special effects. In a similar vein, Query AutoAwesome automatically enhances a query by ingesting a database and the query. Query AutoAwesome produces a set of enhanced queries that a user can then choose to use or discard. A key problem that we solve is that the space of potential enhancements is large, so we introduce objective functions to narrow the search space to a tractable space. We describe our plans for implementing Query AutoAwesome and discuss our ideas for future work.
Uniqueness Theorem of W-Constraints for Simple Singularities
Creators: name: Liu, Si-Qi
name: Yang, Di
name: Zhang, Youjin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In a recent paper [3], Bakalov and Milanov proved that the total descendant potential of a simple singularity satisfies the W-constraints, which come from the W-algebra of the lattice vertex algebra associated to the root lattice of this singularity and a twisted module of this vertex algebra. In the present paper, we prove that the solution of these W-constraints is unique up to a constant factor, as conjectured by Bakalov and Milanov in their paper.
description: 18 pages
Datasets and code for: Lipid hydrogen isotope compositions primarily reflect growth water in the model archaeon Sulfolobus acidocaldarius
Creators: name: Carolynn Harris
Publisher: name: Zenodo
Year: 2025
Subjects: hydrogen isotopes
archaeal lipids
biomarkers

description: Dataset and code for: Lipid hydrogen isotope compositions primarily reflect growth water in the model archaeon Sulfolobus acidocaldarius (Harris et al., 2025, AEM). 

Full author list: Carolynn M. Harris, Sebastian Kopf, Jeemin H. Rhim, Alec Cobban, Felix J. Elling, Xiahong Feng, Jamie McFarlin, Yuki Weber, Yujiao Zhang, Alice Zhou, Harpreet Batther, Ann Pearson, William D. Leavitt

The stable hydrogen isotope composition (δ2H) of lipid biomarkers can track environmental processes and remain stable over geologically relevant time scales, enabling studies of past climate, hydrology, and ecology. Most research has focused on lipids from the domain Eukarya (e.g., plant waxes, long-chain alkanes), and the potential of prokaryotic lipid biomarkers from the domain Archaea to offer unique insights into environments not captured by eukaryotic lipids remains unclear. Here, we investigate the H-isotope composition of biphytanes in Sulfolobus acidocaldarius, a model thermoacidophile and obligate heterotroph. We conducted a series of experiments that varied temperature, pH, shaking rate, electron acceptor availability, or electron donor flux. From these experiments, we quantified the lipid/water H-isotope fractionation (2εL/W) values for core biphytane chains derived from tetraether lipids. The 2εL/W values are consistently negative (-230 to -180 ‰) and are relatively invariant across all experiments despite a 20-fold change in doubling times and 2-fold change in lipid cyclization. The magnitude and relative invariance of 2εL/W values are consistent with studies on other heterotrophic archaea and suggests archaeal lipids may be faithful recorders of the δ2H composition of growth water. Our study highlights the potential of archaeal lipid δ2H as a hydrological proxy, offering new insights into environments where traditional proxies, such as plant-derived lipids, are not available, including extreme environments and extraterrestrial settings.
Der Beitrag von Kollisionsopfersuchen zur Abschätzung des Kollisionsrisikos von Fledermäusen an Windenergieanlagen
Creators: name: Niermann, Ivo
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Wind turbines
subject: bats
subject: fatality searches
subject: Windenergieanlagen
subject: Fledermäuse
subject: Kollisionsopfersuchen
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft::333 | Boden- und Energiewirtschaft::333,7 | Natürliche Ressourcen, Energie und Umwelt

description: [no abstract]
Nebelkammerreaktoren zur Kultivierung biotechnologisch relevanter Systeme
Creators: name: Tscheschke, Bernd Michael
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Mist-chamber bioreactor
subject: ultrasonic vaporization
subject: shear stress
subject: Nebelkammerreaktor
subject: Ultraschallzerstäubung
subject: Scherstress
subject: Aerosol
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: [no abstract]
Intersatellite laser interferometry : test environments for GRACE follow-on
Creators: name: Schütze, Daniel
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: GRACE follow-on
subject: intersatellite interferometry
subject: space instrumentation
subject: Intersatelliten-Interferometrie
subject: Raumfahrttechnologie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
title: Predicting Critical Warps in Near-Threshold GPGPU Applications Using a Dynamic Choke Point Analysis
Creators: name: Sanyal, Sourav
Publisher: name: Utah State University
Year: 2019

description: General purpose graphics processing units (GP-GPU), owing to their enormous thread-level parallelism, can significantly improve the power consumption at the near-threshold (NTC) operating region, while offering close to a super-threshold performance. However, process variation (PV) can drastically reduce the GPU performance at NTC. In this work, choke points—a unique device-level characteristic of PV at NTC—that can exacerbate the warp criticality problem in GPUs have been explored. It is shown that the modern warp schedulers cannot tackle the choke point induced critical warps in an NTC GPU. Additionally, Choke Point Aware Warp Speculator, a circuit-architectural solution is proposed to dynamically predict the critical warps in GPUs, and accelerate them in their respective execution units. The best scheme achieves an average improvement of ∼39% in performance, and ∼31% in energy-efficiency, over one state-of-the-art warp scheduler, across 15 GPGPU applications, while incurring marginal hardware overheads.
Strukturaufklärung und Totalsynthese von Kulkenon sowie Studien zur Totalsynthese von Sulfangolid C und Studien zur syn-selektiven vinylogen Kobayashi-Aldolreaktion
Creators: name: Symkenberg, Gerrit
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: natural products
subject: vinylogous Mukaiyama aldol reaction
subject: vinylogous Kobayashi aldol reaction
subject: total synthesis
subject: structure elucidation
subject: Murata's method
subject: Naturstoffe
subject: Kulkenon
subject: Sulfangolid C
subject: vinyloge Mukaiyama-Aldolreaktion
subject: vinyloge Kobayashi-Aldolreaktion
subject: Totalsynthese
subject: Strukturaufklärung
subject: Murata-Methode
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]