cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
78 Pairs of Possible PSR-SNR Associations
Creators: name: Su, Hongquan
name: Li, Qing-Kang
name: Zhu, Hui
name: Tian, Wen-Wu
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We discuss the criteria to associate PSRs with SNRs, and summary 78 pairs of possible PSR-SNR associations which is the most complete sample so far. We refine them into three categories according to degree of reliability. Statistic study on PSR-SNR associations helps us understand massive star evolution and constrain pulsar's theory models.
description: Accepted for publication in NARIT Conference Series (NCS), 2 pages, 1 table
Reporting negative results to stimulate experimental hydrology : Discussion of the Opinion paper "The role of experimental work in hydrological sciences - insights from a community survey" by Blume et al.
Creators: name: Van Emmerik, Tim
name: Popp, Andrea
name: Solcerova, Anna
name: Müller, Hannes
name: Hut, Rolf
Publisher: name: London : EarthArXiv
Year: 2018
Subjects: subject: Experimental
subject: Fieldwork
subject: Hydrology
subject: Negative Results
subject: Publishing
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften
subject: Dewey Decimal Classification::500 | Naturwissenschaften::551 | Geologie, Hydrologie, Meteorologie

description: Experimental work in hydrology is in decline. Based on a community survey, Blume et al. showed that the hydrological community associates experimental work with greater risks. One of the main issues with experimental work is the higher chance on negative results (defined here as when the expected or wanted result was not observed despite careful experimental design, planning and execution), resulting in a longer and more difficult publishing process. Reporting on negative results would avoid putting time and resources in repeating experiments that lead to negative results, and give experimental hydrologists the scientific recognition they deserve. With this commentary, we propose four potential solutions to encourage reporting on negative results, which might contribute to a stimulation of experimental hydrology.
Laser ion acceleration by using the dynamic motion of a target
Creators: name: Morita, Toshimasa
Publisher: name: arXiv
Year: 2013
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Proton acceleration by using a 620-TW, 18-J laser pulse of peak intensity of $5\times 10^{21}$ W/cm$^{2}$ irradiating a disk target is examined using three-dimensional particle-in-cell simulations. It is shown that protons are accelerated efficiently to high energy for a "light" material in the first layer of a double-layer target, because a strongly inhomogeneous expansion of the first layer occurs by a Coulomb explosion within such a material. Moreover, a large movement of the first layer for the accelerated protons is produced by radiation-pressure-dominant acceleration. A time-varying electric potential produced by this expanding and moving ion cloud accelerates protons effectively. In addition, using the best material for the target, one can generate a proton beam with an energy of 200 MeV and an energy spread of 2$%$.
description: 15 pages, 18 figures
Separating Algorithmic Thinking and Programming
Creators: name: Chandoo, Maurice
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: machine-computer game
subject: trace-based programming
subject: model of computation
subject: notional machine
subject: programming education
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: We show how the first steps of algorithmic thinking and programming can be trained separately. The learner is not assumed to have any prior experience. A general framework and a sequence of training tasks is described and tested in practice with two 10th graders. Both were able to write relatively complex programs using only pen & paper within two days. To train algorithmic thinking, computational problems are presented as games to the learner. Roughly speaking, a winning strategy corresponds to an algorithm which solves the problem. Thus, if the learner consistently wins the game for various instances then this indicates that they have found an algorithm. We describe a general mechanism to translate a computational problem into such a game. For the programming part, the learner is shown how a program can be constructed from traces. Programs are specified in a language which depends on the underlying model of computation (think of Turing machines, pushdown automata or instruction set architectures); such a model can be seen as a notional machine. The language itself is very simple yet broadly applicable due to the generality of our definition of model of computation.
MPEC 2025-C112 : 2025 CE2
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 CE2

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Simultaneous inference for the comparison of overdispersed multinomial data
Creators: name: Vogel, Charlotte
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2018
Subjects: subject: polytomous
subject: count data
subject: overdispersion
subject: multiple comparisons
subject: simultaneous inference
subject: multiple contrast test
subject: simultaneous confidence intervals
subject: Zähldaten
subject: Multinomial
subject: Überdispersion
subject: Mehrfachvergleiche
subject: simultane Inferenz
subject: multiple Hypothesentests
subject: simultane Konfidenzintervalle
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: Multinomial data is present when the outcome of an experiment is a discrete choice of more than two mutually exclusive alternatives and a multinomial distribution is assumed as the underlying distribution. Usually, a multinomial regression model is considered for the analysis of multinomial count data. Frequently, such data exhibits overdispersion especially if the data is acquired in clusters. The collection of data in cell cultures, litters, members of a family or classroom will lead to observations that are more similar within clusters than observations from di erent clusters. Therefore, it has to be expected that some sources of variation may di er between clusters and overdispersion is present. In addition, several treatments are often of interest for such data, causing a multiple testing problem. While for normally distributed data multiple comparison procedures proposed by Tukey and Dunnett are standard since decades, multiple treatment comparisons between several overdispersed multinomial samples have been rarely investigated. The primary objective of this thesis is to develop a method to obtain multiple hypothesis tests and simultaneous confidence intervals for the comparison of multiple polytomous vectors that lack independence among experimental units due to a collection of data in clusters. Building on previous work, overdispersion is considered and an asymptotic procedure is proposed for simultaneous inference of odds ratios between multiple multinomial samples by including an estimated dispersion parameter. To assess validity, a simulation approach utilizing the Dirichlet-multinomial distribution is applied to determine the simultaneous coverage probability of confidence intervals for different magnitudes of overdispersion. As part of this thesis, the proposed test procedure is implemented in the statistical software environment R in a user-friendly way. The application of the novel method and corresponding R-functions is described comprehensively on two real data sets from toxicological research and one data set from a social study. Especially the first example is examined in detail and an alternative approach using multiple marginal models is presented. Possible problems are discussed and suggestions for future work are outlined.
Investigating the fluxes and physics potential of LHC neutrino experiments
Creators: name: Kling, Felix
name: Mäkelä, Toni
name: Trojanowski, Sebastian
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The initiation of a novel neutrino physics program at the Large Hadron Collider (LHC) and the purpose-built Forward Physics Facility (FPF) proposal have motivated studies exploring the discovery potential of these searches. This requires resolving degeneracies between new predictions and uncertainties in modeling neutrino production in the forward kinematic region. The present work investigates a broad selection of existing predictions for the parent hadron spectra at FASER$ν$ and the FPF to parameterize expected correlations in the neutrino spectra produced in their decays and to determine the highest achievable precision for their observation based on Fisher information. This allows for setting constraints on various physics processes within and beyond the Standard Model, including neutrino non-standard interactions. We also illustrate how combining multiple neutrino observables could lead to experimental confirmation of the enhanced-strangeness scenario proposed to resolve the cosmic-ray muon puzzle already during the ongoing LHC Run 3.
description: 21 pages, 5 figures
Dispersive optical nonlinearities in an EIT-Rydberg medium
Creators: name: Stanojevic, Jovica
name: Parigi, Valentina
name: Bimbard, Erwan
name: Ourjoumtsev, Alexei
name: Grangier, Philippe
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We investigate dispersive optical nonlinearities that arise from Rydberg excitation blockade in cold Rydberg gases. We consider a two-photon transition scheme and study the non-linear response to a weak optical probe in presence of a strong control beam. For very low probe fields, the dominant nonlinearities are of the third order and they can be exactly evaluated in a steady state regime. In a more general case, the change in average atomic populations and coherences due to Rydberg interactions can be characterized by properly defined scaling parameters, which are generally complex numbers but in certain situations take the usual meaning of the number of atoms in a blockade sphere. They can be used in a simple "universal scaling" formula to determine the dispersive optical nonlinearity of the medium. We also develop a novel technique to account for the Rydberg interaction effects, by simplifying the treatment of nonlocal interaction terms, the so-called collisional integrals. We find algebraic relations that only involve two-body correlations, which can be solved numerically. All average populations and coherences are then obtained straightforwardly.
description: 9 pages, 4 figures
Simultaneous small sample inference based on profile likelihood
Creators: name: Gerhard, Daniel
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Profile likelihood
subject: simultaneous confidence intervals
subject: multiple comparisons
subject: Likelihood Profile
subject: simultane Konfidenzintervalle
subject: multiple Vergleiche
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
Proceedings 10th International Workshop on Formal Engineering Approaches to Software Components and Architectures
Creators: name: Buhnova, Barbora
name: Happe, Lucia
name: Kofroň, Jan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: These are the proceedings of the 10th International Workshop on Formal Engineering approaches to Software Components and Architectures (FESCA). The workshop was held on March 23, 2013 in Rome (Italy) as a satellite event to the European Joint Conference on Theory and Practice of Software (ETAPS'13). The aim of the FESCA workshop is to bring together both young and senior researchers from formal methods, software engineering, and industry interested in the development and application of formal modelling approaches as well as associated analysis and reasoning techniques with practical benefits for component-based software engineering. FESCA aims to address the open question of how formal methods can be applied effectively to these new contexts and challenges. FESCA is interested in both the development and application of formal methods in component-based development and tries to cross-fertilize their research and application.
On the short term stability and tilting motion of a well-observed low-latitude solar coronal hole
Creators: name: Heinemann, Stephan G.
name: Hofmeister, Stefan J.
name: Turtle, James A.
name: Pomoell, Jens
name: Asvestari, Eleanna
name: Sterling, Alphonse C.
name: Diercke, Andrea
name: Downs, Cooper
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The understanding of the solar magnetic coronal structure is tightly linked to the shape of open field regions, specifically coronal holes. A dynamically evolving coronal hole coincides with the local restructuring of open to closed magnetic field, which leads to changes in the interplanetary solar wind structure. By investigating the dynamic evolution of a fast-tilting coronal hole, we strive to uncover clues about what processes may drive its morphological changes, which are clearly visible in EUV filtergrams. Using combined 193A and 195A EUV observations by AIA/SDO and EUVI/STEREO_A, in conjunction with line-of-sight magnetograms taken by HMI/SDO, we track and analyze a coronal hole over 12 days to derive changes in morphology, area and magnetic field. We complement this analysis by potential field source surface modeling to compute the open field structure of the coronal hole. We find that the coronal hole exhibits an apparent tilting motion over time that cannot solely be explained by solar differential rotation. It tilts at a mean rate of ~3.2°/day that accelerates up to ~5.4°/day. At the beginning of May, the area of the coronal hole decreases by more than a factor of three over four days (from ~13 * 10^9 km^2 to ~4 * 10^9 km^2), but its open flux remains constant (~2 * 10^20 Mx). Further, the observed evolution is not reproduced by modeling that assumes the coronal magnetic field to be potential. In this study, we present a solar coronal hole that tilts at a rate that has yet to be reported in literature. The rate exceeds the effect of the coronal hole being advected by either photospheric or coronal differential rotation. Based on the analysis we find it likely that this is due to morphological changes in the coronal hole boundary caused by ongoing interchange reconnection and the interaction with a newly emerging ephemeral region in its vicinity.
description: Accepted in A&A September 15, 2023; 10 pages, 8 figures
Anomalous orbital expansion of low-mass X-ray binary 2A 1822-371: the existence of a circumbinary disk?
Creators: name: Wei, Na
name: Jiang, Long
name: Chen, Wen-Cong
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The source 2A 1822-371 is an eclipsing low-mass X-ray binary (LMXB) consisting of a neutron star (NS) and a $\sim0.5~M_{\odot}$ donor star in an orbit of 5.57 hr. Based on timing of the eclipse arrival times, this source was found to be experiencing a rapid orbital expansion with an orbital-period derivative as $\dot{P}_{\rm orb}=(1.51\pm0.05)\times10^{-10}~\rm s\, s^{-1}$, implying that the mass-transfer rate should be higher than at least three times the Eddington accretion rate. The standard magnetic braking (MB) model cannot produce such a high mass-transfer rate. The modified MB model derived by Van \& Ivanova (2019) can produce a high mass-transfer rate, resulting in a high $\dot{P}_{\rm orb}$. This work proposes an alternative model to account for the anomalously high mass-transfer rate and $\dot{P}_{\rm orb}$ of 2A 1822-371. During the mass transfer, a tiny fraction of the transferred material is thought to form a circumbinary (CB) disk around the LMXB, which can efficiently extract orbital angular momentum from the system by the interaction between the CB disk and the binary. We use the MESA code to model the formation and evolution of 2A 1822-371 for different CB-disk masses. When the CB-disk mass is $2.3\times10^{-8}~ M_{\odot}$, the simulation can reproduce the observed donor-star mass, orbital period, and orbital-period derivative. Such a CB disk can accelerate the evolution of the binary and produce a high mass transfer rate of $1.9\times10^{-7}~ M_\odot\,\rm yr^{-1}$, driving the binary to evolve toward a wide-orbit system. Therefore, we propose that CB disks may be responsible for the rapid orbital changes observed in some LMXBs.
description: 8 pages, 8 figures, Astronomy and Astrophysics in press
Solute Transport in Heterogeneous Soil with Time-Dependent Boundary Conditions
Creators: name: Cremer, Clemens J.M.
name: Neuweiler, Insa
name: Bechtold, Michel
name: Vanderborght, Jan
Publisher: name: McLean, VA : GeoScienceWorld
Year: 2016
Subjects: subject: ADE
subject: advection–dispersion equation
subject: RWPT
subject: random walk particle tracking
subject: Dewey Decimal Classification::600 | Technik

description: We investigate the effect of dynamic boundary conditions on solute transport in unsaturated, heterogeneous, bimodal porous media. Solute transport is studied with two-dimensional numerical flow and transport models for scenarios where either (i) solely infiltration or (ii) more realistic dynamic (infiltration–evaporation) boundary conditions are imposed at the soil surface. Travel times of solute are affected by duration and intensity of infiltration and evaporation events even when cycle-averaged inflow rates of the scenarios are identical. Three main transport mechanisms could be identified based on a criterion for the infiltration rate that is related to the hydraulic conductivity curves of the media. If, based on this criterion, infiltration rates are low, the transport paths for upward and downward transport do not differ significantly, and the breakthrough curves of solute are similar to the one obtained under stationary infiltration. If infiltration rates are moderate, travel paths deviate between upward and downward flow, leading to a trapping of solute and strong tailing of the breakthrough curves. If infiltration and evaporation rates are very high, lateral advective–diffusive transport can lead to very efficient and fast downward transport. Thus, solute breakthrough depends strongly on lateral flow paths enforced by the boundary conditions at the soil surface. If heterogeneity of the materials is not strong and the structure is tortuous, dynamic boundary conditions mainly lead to increased macrodispersion. We test simplified upscaled transport models based on stationary flow rates to estimate breakthrough curves and demonstrate how the transport mechanisms are captured in the model parameters.
Additional file 1 of Interplay of gene expression and regulators under salinity stress in gill of Labeo rohita
Creators: name: Harshini, Vemula
name: Shukla, Nitin
name: Raval, Ishan
name: Kumar, Sujit
name: Shrivastava, Vivek
name: Chaudhari, Aparna
name: Patel, Amrutlal K.
name: Joshi, Chaitanya G.
Publisher: name: figshare
Year: 2023
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: Evolutionary Biology
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Computational Biology

description: Supplementary Material 1
Sub-millimetre accurate human hand kinematics: from surface to skeleton
Creators: name: Ma’touq, Jumana
name: Hu, Tingli
name: Haddadin, Sami
Publisher: name: London : Taylor and Francis
Year: 2018
Subjects: subject: Hand kinematics
subject: joint centre of rotation
subject: hand motion analysis
subject: hand biomechanics
subject: thumb biomechanic
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: A highly accurate human hand kinematics model and identification are proposed. The model includes the five digits and the palm arc based on mapping function between surface landmarks and estimated joint centres of rotation. Model identification was experimentally performed using a motion tracking system. The evaluation of the marker position estimation error, which is on sub-millimetre level across all digits, underlines model quality and accuracy. Noticeably, with the development of this model, we were able to improve various modelling assumptions from literature and found a basic linear relationship between surface and skeleton rotational angles.
On the 12C/13C isotopic ratio at the dawn of chemical evolution
Creators: name: Molaro, P.
name: Aguado, D. S.
name: Caffau, E.
name: Prieto, C. Allende
name: Bonifacio, P.
name: Hernandez, J. I. Gonzalez
name: Rebolo, R.
name: Osorio, M. R. Zapatero
name: Cristiani, S.
name: Pepe, F.
name: Santos, N. C.
name: Alibert, Y.
name: Cupani, G.
name: Di Marcantonio, P.
name: D'Odorico, V.
name: Lovis, C.
name: Martins, C. J. A. P.
name: Milakovic, D.
name: Murphy, M.
name: Nunes, N. J.
name: Schmidt, T. M.
name: Sousa, S.
name: Sozzetti, a.
name: Mascareno, A. Suarez
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The known Mega and Hyper Metal-Poor (MMP-HMP) stars with [Fe/H]<-6.0 and <-5.0, respectively, likely belong to the CEMP-no class, i.e. carbon-enhanced stars with low or absent second peak neutron capture elements. They are likely second generation stars and the few elements measurable in their atmospheres are used to infer the properties of single or very few progenitors. The high carbon abundance in the CEMP-no stars offers a unique opportunity to measure the carbon isotopic ratio, which directly monitors the presence of mixing between the He and H-burning layers either within the star or in the progenitor(s). By means of high-resolution spectra acquired with the ESPRESSO spectrograph at the VLT we aim to derive values for the 12C/13C ratio at the lowest metallicities. A spectral synthesis technique based on the SYNTHE code and on ATLAS models is used within a Markov-chain Monte Carlo methodology to derive 12C/13C in the stellar atmospheres of five of the most metal poor stars. These are the Mega Metal-Poor giant SMS J0313-6708 ([Fe/H]<-7.1), the Hyper Metal-Poor dwarf HE1327-2326 ([Fe/H]=-5.8),the Hyper Metal-Poor giant SDSS J1313-0019 ([Fe/H] = -5.0) and the Ultra Metal-Poor subgiant HE0233-0343 ([Fe/H]=-4.7). We also revise a previous value for the Mega Metal-Poor giant SMSS J1605-1443 with ([Fe/H] = -6.2). In four stars we derive an isotopic value while for HE1327-2326 we provide a lower limit. All Measurements are in the range 39<12C/13C<100 showing that the He- and H-burning layers underwent partial mixing either in the stars or, more likely, in their progenitors. This provides evidence of a primary production of 13C at the dawn of chemical evolution. [abridged]
description: 10 pages, 6 figure, accepted A&A
Smoothing cones over K3 surfaces
Creators: name: Coughlan, Stephen
name: Sano, Taro
Publisher: name: France : Association Epiga
Year: 2018
Subjects: subject: Affine Cones
subject: K3 surfaces
subject: Fano 3-folds
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: We prove that the affine cone over a general primitively polarised K3 surface of genus g is smoothable if and only if g ≤ 10 or g = 12. We also give several examples of singularities with special behaviour, such as surfaces whose affine cone is smoothable even though the projective cone is not.
Singular behaviour of rotationally symmetric surfaces of codimension two evolving under mean curvature flow
Creators: name: Stroot, Maren
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Mean curvature flow
subject: rotationally symmetric surfaces
subject: curve shortening flow
subject: higher codimension
subject: Mittlerer Krümmungsfluss
subject: Rotationssymmetrie
subject: höhere Kodimension
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: [no abstract]
Spinorial R-matrix
Creators: name: Chicherin, D.
name: Derkachov, S.
name: Isaev, A. P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: R-matrix acting in the tensor product of two spinor representation spaces of Lie algebra so(d) is considered thoroughly. Corresponding Yang-Baxter equation is proved. The relation to the local Yang-Baxter relation is established.
description: 18 pages, 6 figures
Singular limits and maximally continued solutions of moving boundary problems
Creators: name: Lippoth, Friedrich-Matthias
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Moving boundary problem
subject: blow-up
subject: quasistationary approximation
subject: Freies Randwertproblem
subject: quasistationäre Approximation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: [no abstract]
Singularities of unitary modular varieties
Creators: name: Behrens, Niko Alexander
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Ball quotient
subject: canonical singularities
subject: toroidal compactification
subject: Ballquotient
subject: kanonische Singularitäten
subject: teroidale Kompaktifizierung
subject: Dewey Decimal Classification::500 | Naturwissenschaften::510 | Mathematik

description: [no abstract]
Simulation of elastic-plastic material behaviour with uncertain material parameters : a spectral stochastic finite element method approach
Creators: name: Fink, Sebastian
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Finite element method
subject: stochastic theory
subject: characterization of uncertainties
subject: random fields/processes
subject: polynomial chaos
subject: linear stochastic finite elements
subject: polynomial chaos algebra
subject: non-linear stochastic finite elements
subject: Finite Elemente Methode
subject: Stochastik
subject: Charakterisierung von Unsicherheiten
subject: Zufallsfelder/-prozesse
subject: Polynom-Chaos
subject: lineare stochastische Finite Elemente Methode
subject: Polynom-Chaos Algebra
subject: nicht-lineare stochastische Finite Elemente
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: [no abstract]
Rich Magnetic Phase Diagram of Putative Helimagnet Sr$_3$Fe$_2$O$_7$
Creators: name: Andriushin, Nikita D.
name: Grumbach, Justus
name: Kim, Jung-Hwa
name: Reehuis, Manfred
name: Tymoshenko, Yuliia V.
name: Onykiienko, Yevhen A.
name: Jain, Anil
name: MacFarlane, W. Andrew
name: Maljuk, Andrey
name: Granovsky, Sergey
name: Hoser, Andreas
name: Pomjakushin, Vladimir
name: Ollivier, Jacques
name: Doerr, Mathias
name: Keimer, Bernhard
name: Inosov, Dmytro S.
name: Peets, Darren C.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The cubic perovskite SrFeO$_3$ was recently reported to host hedgehog- and skyrmion-lattice phases in a highly symmetric crystal structure which does not support the Dzyaloshinskii-Moriya interactions commonly invoked to explain such magnetic order. Hints of a complex magnetic phase diagram have also recently been found in powder samples of the single-layer Ruddlesden-Popper analog Sr$_2$FeO$_4$, so a reinvestigation of the bilayer material Sr$_3$Fe$_2$O$_7$, believed to be a simple helimagnet, is called for. Our magnetization and dilatometry studies reveal a rich magnetic phase diagram with at least 6 distinct magnetically ordered phases and strong similarities to that of SrFeO$_3$. In particular, at least one phase is apparently multiple-$\mathbf{q}$, and the $\mathbf{q}$s are not observed to vary among the phases. Since Sr$_3$Fe$_2$O$_7$ has only two possible orientations for its propagation vector, some of the phases are likely exotic multiple-$\mathbf{q}$ order, and it is possible to fully detwin all phases and more readily access their exotic physics.
description: 14 pages, 13 figures
Microresonator-Based Comb Generation without an External Laser Source
Creators: name: Johnson, Adrea R.
name: Okawachi, Yoshitomo
name: Lamont, Michael R. E.
name: Levy, Jacob S.
name: Lipson, Michal
name: Gaeta, Alexander L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Recent developments demonstrate that parametric four-wave mixing (FWM) in high-Q microresonators is a highly promising and effective approach for optical frequency comb generation, with applications including spectroscopy, optical clocks, arbitrary waveform generation, frequency metrology, and astronomical spectrograph calibration. Each of these microresonator platforms utilizes a scheme in which the system is pumped by a single-frequency laser at a cavity resonance. This scheme requires tuning of the pump wavelength into resonance and the generated comb is susceptible to fluctuations in pump power or frequency which can disrupt the soft thermal lock and comb generation. We demonstrate a novel fiber-microresonator dual-cavity architecture that preferentially oscillates at modes of the microresonator due to its high density of states and generates robust and broadband combs (> 900 nm) without an external pump laser. Such a scheme could greatly simplify the comb generation process and allow for a fully-integrated chip-scale source with an on-chip amplifier.
description: 14 pages, 5 figures
Electroweak Baryogenesis And The Fermi Gamma-Ray Line
Creators: name: Kozaczuk, Jonathan
name: Profumo, Stefano
name: Wainwright, Carroll L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Many particle physics models attempt to explain the 130 GeV gamma-ray feature that the Fermi-LAT observes in the Galactic Center. Neutralino dark matter in non-minimal supersymmetric models, such as the NMSSM, is an especially well-motivated theoretical setup which can explain the line. We explore the possibility that regions of the NMSSM consistent with the 130 GeV line can also produce the observed baryon asymmetry of the universe via electroweak baryogenesis. We find that such regions can in fact accommodate a strongly first-order electroweak phase transition (due to the singlet contribution to the effective potential), while also avoiding a light stop and producing a Standard Model-like Higgs in the observed mass range. Simultaneously, CP-violation from a complex phase in the wino-higgsino sector can account for the observed baryon asymmetry through resonant sources at the electroweak phase transition, while satisfying current constraints from dark matter, collider, and electric dipole moment (EDM) experiments. This result is possible by virtue of a relatively light pseudoscalar Higgs sector with a small degree of mixing, which yields efficient s-channel resonant neutralino annihilation consistent with indirect detection constraints, and of the moderate values of $μ$ required to obtain a bino-like LSP consistent with the line. The wino mass is essentially a free parameter which one can tune to satisfy electroweak baryogenesis. Thus, the NMSSM framework can potentially explain the origins of both baryonic and dark matter components in the Universe. The tightness of the constraints we impose on this scenario makes it extraordinarily predictive, and conclusively testable in the near future by modest improvements in EDM and dark matter search experiments.
description: 33 pages, 5 figures, 1 table. Submitted to PRD
Unification of Gravity and Internal Interactions
Creators: name: Konitopoulos, Spyros
name: Roumelioti, Danai
name: Zoupanos, George
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the gauge theoretic approach of gravity, General Relativity is described by gauging the symmetry of the tangent manifold in four dimensions. Usually the dimension of the tangent space is considered to be equal to the dimension of the curved manifold. However, the tangent group of a manifold of dimension $d$ is not necessarily $SO_d$. It has been suggested earlier that by gauging an enlarged symmetry of the tangent space in four dimensions one could unify gravity with internal interactions. Here we consider such a unified model by gauging the $SO_{(1,17)}$ as the extended Lorentz group overcoming in this way some difficulties of the previous attempts of similar unification and eventually we obtain the $SO_{10}$ GUT, supplemented by an $SU_2 \times SU_2$ global symmetry.
Solidarity in the EU: wishful thinking or status quo? : analysing the paradox of EU solidarity and national sovereignty in civil protection in the context of Art. 222 TFEU (Solidarity Clause)
Creators: name: Berchtold, Claudia
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: civil protection
subject: solidarity
subject: EU legislation
subject: Katastrophenschutz
subject: Solidarität
subject: Europäische Union
subject: Solidaritätsklausel
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::340 | Recht

description: The Lisbon Treaty added a new article to the EU primary legislation (Art. 222 TFEU also referred to as the Solidarity Clause) which requires solidarity between the EU and its Member States in crisis situations brought about by natural or man-made hazards and terrorist attacks. At the same time, solidarity remains a vague legal concept and the EU is struggling to develop joint solidary policies, e.g. in response to the economic and financial crisis and most recently with respect to asylum and immigration in the context of the refugee crisis. This gives the impression that solidarity is less a political reality than mere wishful thinking. Consequently, the character and intention of primary legislation referring to solidarity remains rather confusing. Have respective norms been created to build a basis for joint efforts and concrete measures in the respective policy fields, or are they insubstantial statements narratively adding to what the Union should be? This question is at the core of this work. The thesis analyses how solidarity is conceptualised at different levels (national and EU) and in different contexts (normal conditions vs. crisis) and relates it to Art. 222 TFEU to finally put these aspects into context of civil protection as an important policy field for the conceptualisation of political entities.
title: International Association of Hospitality Financial Management Educations (iAHFME) Academic Member 2018 Total Annual Earnings
Creators: name: Schmidgall, Raymond S.
Publisher: name: University of Massachusetts Amherst
Year: 2019

description: This study uses survey research to determine the 2018 annual earnings of hospitality financial man- agement educators. Forty-two percent of iAHFME members affiliated with educational institutions responded. Survey results show that for 2018, annual base salaries of iAHFME members ranged from $71,250 to $285,000. The lowest-paid member was an assistant professor and the highest-paid mem- ber, a full professor. Many respondents supplemented their base salaries by teaching during summer school or consulting or both. The total annual earnings of iAHFME members ranged from $80,000 to $285,000. Survey results also show that hospitality financial management educators appear to be more highly compensated than the average college professor and their counterparts in the lodging industry.
Snakes for adapting GIS road and river objects to airborne laser scanning data
Creators: name: Göpfert, Jens
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Network snakes
subject: roads
subject: rivers
subject: ALS
subject: GIS vector data
subject: Straßen
subject: Flüsse
subject: GIS Vektordaten
subject: Dewey Decimal Classification::500 | Naturwissenschaften::520 | Astronomie, Kartographie

description: [no abstract]
The Mirage of the Fermi Scale
Creators: name: Antipin, Oleg
name: Sannino, Francesco
name: Tuominen, Kimmo
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The discovery of a light Higgs boson at LHC may be suggesting that we need to revise our model building paradigms to understand the origin of the weak scale. We explore the possibility that the Fermi scale is not fundamental but rather a derived one, i.e. a low energy mirage. We show that this scenario emerges in a very natural way in models previously used to break the electroweak symmetry dynamically and suggest a simple dynamical framework for this idea. In our model the electroweak scale results from the interplay between two very high energy scales, one typically of the order of $\Luv\sim 10^{10}$ GeV and the other around $M_{\rm U} \sim 10^{16}$ GeV, although other values are also possible.
description: 5 pages, 1 figure
Hyperspherical explicitly correlated Gaussian approach for few-body systems with finite angular momentum
Creators: name: Rakshit, D.
name: Blume, D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Within the hyperspherical framework, the solution of the time-independent Schroedinger equation for a n-particle system is divided into two steps, the solution of a Schroedinger like equation in the hyperangular degrees of freedom and the solution of a set of coupled Schroedinger like hyperradial equations. The solutions to the former provide effective potentials and coupling matrix elements that enter into the latter set of equations. This paper develops a theoretical framework to determine the effective potentials, as well as the associated coupling matrix elements, for few-body systems with finite angular momentum L=1 and negative and positive parity. The hyperangular channel functions are expanded in terms of explicitly correlated Gaussian basis functions and relatively compact expressions for the matrix elements are derived. The developed formalism is applicable to any n; however, for n greater or equal to 6, the computational demands are likely beyond present-day computational capabilities. A number of calculations relevant to cold atom physics are presented, demonstrating that the developed approach provides a computationally efficient means to solving four-body bound and scattering problems with finite angular momentum on powerful desktop computers. Details regarding the implementation are discussed.
Spatial interpolation of climate data for hydrological and environmental applications
Creators: name: Berndt, Christian
Publisher: name: Hannover : Institut für Wasserwirtschaft, Hydrologie und Landwirtschaftlichen Wasserbau
Year: 2016
Subjects: subject: Interpolation
subject: Messwert
subject: Meteorologische Station
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften
subject: Dewey Decimal Classification::500 | Naturwissenschaften::551 | Geologie, Hydrologie, Meteorologie

description: [no abstract]
Incorporating external information in analyses of clinical trials with binary outcomes
Creators: name: Xie, Minge
name: Liu, Regina Y.
name: Damaraju, C. V.
name: Olson, William H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: External information, such as prior information or expert opinions, can play an important role in the design, analysis and interpretation of clinical trials. However, little attention has been devoted thus far to incorporating external information in clinical trials with binary outcomes, perhaps due to the perception that binary outcomes can be treated as normally-distributed outcomes by using normal approximations. In this paper we show that these two types of clinical trials could behave differently, and that special care is needed for the analysis of clinical trials with binary outcomes. In particular, we first examine a simple but commonly used univariate Bayesian approach and observe a technical flaw. We then study the full Bayesian approach using different beta priors and a new frequentist approach based on the notion of confidence distribution (CD). These approaches are illustrated and compared using data from clinical studies and simulations. The full Bayesian approach is theoretically sound, but surprisingly, under skewed prior distributions, the estimate derived from the marginal posterior distribution may not fall between those from the marginal prior and the likelihood of clinical trial data. This counterintuitive phenomenon, which we call the "discrepant posterior phenomenon," does not occur in the CD approach. The CD approach is also computationally simpler and can be applied directly to any prior distribution, symmetric or skewed.
description: Published in at http://dx.doi.org/10.1214/12-AOAS585 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Software-defined middlebox networking
Creators: name: Abujoda, Ahmed Mohamed Ahmed
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2016
Subjects: subject: Network function virtualization
subject: software defined networking
subject: middlebox
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: [no abstract]
Soil moisture, crop yield and soil salinity relocation under partial rootzone drying irrigation
Creators: name: Samak, Abdel-Lateif Abdel-Wahab
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2012
Subjects: subject: Soil moisture
subject: soil salinity
subject: partial rootzone drying irrigation
subject: water-saving
subject: Bodenfeuchte
subject: Salinität des Bodens
subject: Wassersparen
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
Somatic hybridisation in different Cyclamen species
Creators: name: Prange, Anika Nadja Sabine
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Cyclamen
subject: somatic embryogenesis
subject: protoplast fusion
subject: molecular marker
subject: Somatische Embryogenese
subject: Protoplastenfusion
subject: molekularer Marker
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
A new discovery space opened by eROSITA: Ionised AGN outflows from X-ray selected samples
Creators: name: Musiimenta, Blessing
name: Brusa, Marcella
name: Liu, Teng
name: Salvato, Mara
name: Buchner, Johannes
name: Igo, Zsofi
name: Waddell, Sophia G. H.
name: Toba, Yoshiki
name: Arcodia, Riccardo
name: Comparat, Johan
name: Alexander, David M.
name: Shankar, Francesco
name: Lapi, Andrea
name: Almeida, Cristina Ramos
name: Georgakakis, Antonis
name: Merloni, Andrea
name: Urrutia, Tanya
name: Li, Junyao
name: Terashima, Yuichi
name: Shen, Yue
name: Wu, Qiaoya
name: Dwelly, Tom
name: Nandra, Kirpal
name: Wolf, Julien
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In the context of an evolutionary model, the outflow phase of an Active Galactic Nuclei (AGN) occurs at the peak of its activity, once the central SMBH is massive enough to generate sufficient power to counterbalance the potential well of the host galaxy. This phase plays a vital role in galaxy evolution. We aim to apply various selection methods to isolate powerful AGNs in the feedback phase, trace and characterise their outflows, and explore the link between AGN luminosity and outflow properties. We applied a combination of methods to the eROSITA Final Equatorial Depth survey (eFEDS) catalogue and isolated ~1400 candidates at z>0.5 out of ~11750 AGNs (~12\%). We tested the robustness of our selection on the small subsample of 50 sources with available good quality SDSS spectra at 0.51\%. We find that the majority of the outflows have momentum flux ratios lower than 20 which rules out an energy-conserving nature. Our present work points to the unequivocal existence of a rather short AGN outflow phase, paving the way towards a new avenue to dissect AGN outflows in large samples within eROSITA and beyond.
description: Accepted for publication in Astronomy and Astrophysics(A&A), 24 pages, 18 figures, 5 tables
AdaptNet: Policy Adaptation for Physics-Based Character Control
Creators: name: Xu, Pei
name: Xie, Kaixiang
name: Andrews, Sheldon
name: Kry, Paul G.
name: Neff, Michael
name: McGuire, Morgan
name: Karamouzas, Ioannis
name: Zordan, Victor
Publisher: name: arXiv
Year: 2023
Subjects: subject: Graphics (cs.GR)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Motivated by humans' ability to adapt skills in the learning of new ones, this paper presents AdaptNet, an approach for modifying the latent space of existing policies to allow new behaviors to be quickly learned from like tasks in comparison to learning from scratch. Building on top of a given reinforcement learning controller, AdaptNet uses a two-tier hierarchy that augments the original state embedding to support modest changes in a behavior and further modifies the policy network layers to make more substantive changes. The technique is shown to be effective for adapting existing physics-based controllers to a wide range of new styles for locomotion, new task targets, changes in character morphology and extensive changes in environment. Furthermore, it exhibits significant increase in learning efficiency, as indicated by greatly reduced training times when compared to training from scratch or using other approaches that modify existing policies. Code is available at https://motion-lab.github.io/AdaptNet.
description: SIGGRAPH Asia 2023. Video: https://youtu.be/WxmJSCNFb28. Website: https://motion-lab.github.io/AdaptNet, https://pei-xu.github.io/AdaptNet