cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Scaling of disorder operator at deconfined quantum criticality
Creators: name: Wang, Yan-Cheng
name: Ma, Nvsen
name: Cheng, Meng
name: Meng, Zi Yang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study scaling behavior of the disorder parameter, defined as the expectation value of a symmetry transformation applied to a finite region, at the deconfined quantum critical point in (2+1)$d$ in the $J$-$Q_3$ model via large-scale quantum Monte Carlo simulations. We show that the disorder parameter for U(1) spin rotation symmetry exhibits perimeter scaling with a logarithmic correction associated with sharp corners of the region, as generally expected for a conformally-invariant critical point. However, for large rotation angle the universal coefficient of the logarithmic corner correction becomes negative, which is not allowed in any unitary conformal field theory. We also extract the current central charge from the small rotation angle scaling, whose value is much smaller than that of the free theory.
description: 20 pages, 11 figures; v2 improved measurement on disorder operator; v3 additional analysis on data fitting
title: Development of ecologically relevant quality indicators for sediment microbial communities
title: Entwicklung eines ökologisch relevanten Qualitätsindikators zur Beschreibung mikrobieller Gemeinschaften in Sedimenten
titleType: AlternativeTitle
Creators: name: Hsu, Pei-Chi
Publisher: name: TUHH Universitätsbibliothek
Year: 2009
Subjects: subject: ecotoxicology
subject: WFD
subject: microbial community
subject: fuzzy logic
subject: sediment
classificationCode: 43.13
subject: Umwelttoxikologie
subject: Aquatisches Sediment
subject: Biotest
subject: Mikrobiozönose
subject: Umwelttoxikologie
subject: Fuzzy-Logik

description: Um die ökologische Relevanz mikrobieller Gemeinschaften in Sedimenten zu beschreiben wurde ein integrierter Qualitätsindikator (IQI) entwickelt, basierend auf den Hauptfaktoren Ökotoxizität und Nährstoffkreisläufe. Die Integration der Hauptfaktoren folgt einem Weight-of-Evidence Ansatz und einem regelbasiertem Fuzzy Model. Unter anderem wird so das ”Aging” der Schadstoffe bewertet. Durch IQI können die bestehenden, auf chemischen Kriterien basierenden Sedimentgüteklassen ergänzt werden, um die Vorgaben der Europäischen Wasserrahmenrichtlinie bezüglich eines guten ökologischen Zustands aller Gewässer zu erfüllen.
description: An integrated quality indicator (IQI) was developed taking ecotoxicities and nutrient cycling as key parameters to address the ecological relevance of sediment microbial communities. The parameters were integrated using weight of evidence approach and a fuzzy rule-based model. As an example of application, the aging of contaminants was evaluated. The IQI provides a framework to supplement currently chemical dominant sediment quality guidelines in reaching the good ecological quality status requested by the European Water Framework Directive.
Network Selection Decision Based on Handover History in Heterogeneous Wireless Networks
Creators: name: Lahby, Mohamed
name: Cherkaoui, Leghris
name: Adib, Abdellah
Publisher: name: arXiv
Year: 2012
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: In recent years, the mobile devices are equipped with several wireless interfaces in heterogeneous environments which integrate a multitude of radio access technologies (RAT's). The evolution of these technologies will allow the users to benefit simultaneously from these RAT's. However, the most important issue is how to choose the most suitable access network for mobile's user which can be used as long as possible for communication. To achieve this issue, this paper proposes a new approach for network selection decision based on Saaty's Fuzzy Analytical Hierarchy Process (FAHP) and the Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS). The FAHP method is used to determine a weight for each criterion, and the TOPSIS method is applied to rank the alternatives. Simulation results are presented to illustrate the effectiveness of our new approach for network selection.
description: 5 pages, 10 figures; ISSN 2047-3338. arXiv admin note: substantial text overlap with arXiv:1204.1383
Global Regularity for Nernst-Planck-Navier-Stokes Systems with Mixed Boundary Conditions
Creators: name: Lee, Fizay-Noah
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q30, 35Q35, 35Q92

description: We consider electrodiffusion of ions in fluids, described by the Nernst-Planck-Navier-Stokes system, in three dimensional bounded domains, with mixed blocking (no-flux) and selective (Dirichlet) boundary conditions for the ionic concentrations and Robin boundary conditions for the electric potential, representing the presence of an electrical double layer. We prove global existence of strong solutions for large initial data in the case of two oppositely charged ionic species. The result hold unconditionally in the case where fluid flow is described by the Stokes equations. In the case of Navier-Stokes coupling, the result holds conditionally on Navier-Stokes regularity. We use a simplified argument to also establish global regularity for the case of purely blocking boundary conditions for the ionic concentrations for two oppositely charged ionic species and also for more than two species if the diffusivities are equal and the magnitudes of the valences are also equal.
description: 27 pages. Revisions according to referees' comments. Results of Section 5 improved: removed smallness condition on initial concentration. Proof of propagation of strict positivity of concentrations added to appendix
Coherence-protected Quantum Gate by Continuous Dynamical Decoupling in Diamond
Creators: name: Xu, Xiangkun
name: Wang, Zixiang
name: Duan, Changkui
name: Huang, Pu
name: Wang, Pengfei
name: Wang, Ya
name: Xu, Nanyang
name: Kong, Xi
name: Shi, Fazhan
name: Rong, Xing
name: Du, Jiangfeng
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: To implement reliable quantum information processing, quantum gates have to be protected together with the qubits from decoherence. Here we demonstrate experimentally on nitrogen-vacancy system that by using continuous wave dynamical decoupling method, not only the coherence time is prolonged by about 20 times, but also the quantum gates is protected for the duration of controlling time. This protocol shares the merits of retaining the superiority of prolonging the coherence time and at the same time easily combining with quantum logic tasks. It is expected to be useful in task where duration of quantum controlling exceeds far beyond the dephasing time.
description: 5 pages, 4 figures
Hunting isolated neutron stars with proper motions from wide-area optical surveys
Creators: name: Toyouchi, Daisuke
name: Hotokezaka, Kenta
name: Takada, Masahiro
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: High-velocity neutron stars (HVNSs) that were kicked out from their birth location can be potentially identified with their large proper motions, and possibly with large parallax, when they come across the solar neighborhood. In this paper, we study the feasibility of hunting isolated HVNSs in wide-area optical surveys by modeling the evolution of NS luminosity taking into account spin-down and thermal radiation. Assuming the upcoming 10-year VRO LSST observation, our model calculations predict that about 10 HVNSs mainly consisting of pulsars with ages of $10^4$--$10^5$ yr and thermally emitting NSs with $10^5$--$10^6$ yr are detectable. We find that a few NSs with effective temperature $< 5 \times 10^5$ K, which are likely missed in the current and future X-ray surveys, are also detectable. In addition to the standard neutron star cooling models, we consider a dark matter heating model. If such a strong heating exists we find that the detectable HVNSs would be significantly cooler, i.e., $\lesssim 5\times 10^5$ K. Thus, the future optical observation will give an unique NS sample, which can provide essential constraints on the NS cooling and heating mechanisms. Moreover, we suggest that providing HVNS samples with optical surveys is helpful for understanding the intrinsic kick-velocity distribution of NSs.
description: 8 pages, 6 figures, submitted to MNRAS
QED Effective Action in Magnetic Field Backgrounds and Electromagnetic Duality
Creators: name: Kim, Sang Pyo
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In the in-out formalism we advance a method of the inverse scattering matrix for calculating effective actions in pure magnetic field backgrounds. The one-loop effective actions are found in a localized magnetic field of Sauter type and approximately in a general magnetic field by applying the uniform semiclassical approximation. The effective actions exhibit the electromagnetic duality between a constant electric field and a constant magnetic field and between $E(x) = E sech^2 (x/L)$ and $B(x) = B sech^2 (x/L)$.
description: RevTex 8 pages; no figure; the abridged version of arXiv:1105.4382 (Secs. I and IV-VII and Appendix B3) published in Phys. Rev. D
Eine Methode zur Berechnung der Druckverteilung an Schiffspropellern mit Hilfe der instationären Tragflächentheorie und zur Kavitationsvorhersage nach einer quasistationären Theorie
Creators: name: Nikolakis, Dimitrios
name: Streckwall, Heinrich
Publisher: name: TUHH Universitätsbibliothek
Year: 1987
Subjects: subject: Druckverteilung
subject: Schiffspropeller
subject: instationäre Tragflächentheorie
subject: quasistationären Theorie
subject: Kavitationsvorhersage
classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines
subject: Schiffspropeller
subject: Tragflügel

description: Eine Methode zur Berechnung der Druckverteilung an Schiffspropellern mit Hilfe der instationären Tragflächentheorie und zur Kavitationsvorhersage nach einer quasistationären Theorie Kavitation tritt am Propeller auf, wenn die Flügelbelastung in einigen Bereichen des Blattes so groß wird, daß der Druck dort den Dampfdruck erreicht oder unterschreitet. Eine ihrer Erscheinungsformen ist die Schichtkavitation. Es bildet sich dabei ein Gasvolumen aus, das einen Teil des Flügels schichtförmig bedeckt. Andere Arten sind Spitzenwirbelkavitation, Blasenkavitation und Wolkenkavitation. In dieser Arbeit soll nur die Schichtkavitation behandelt werden. Ein Schiffspropeller arbeitet in der Praxis stets in einer räumlich inhomogenen Zuströmung. Deshalb sind Lage, Ausdehnung und Gesamtvolumen einer Kavitationsschicht von der WinkelsteIlung des betrachteten Flügels abhängig. Die Veränderlichkeit der Schicht verursacht Vibrationen am Hinterschiff. Die Außenhaut wird so zusätzlich belastet. Sollten die Vibrationen im hörbaren Bereich liegen, kann es zu erheblichen Lärmbelastungen innerhalb des Schiffes kommen. Zur Vermeidung dieser Effekte wäre es wünschenswert, die variable Geometrie und damit das variable Gesamtvolumen der Kavitationsschicht auch theoretisch zu erfassen. Ausgangspunkt für die Propellerkavitationsrechnung ist die Berechnung des Druckfeldes im kavitationsfreien Zustand. Hierzu existieren eine Reihe praktikabler Verfahren.
Spectral singularities and threshold gain of a slab laser under illumination of a focused Gaussian beam
Creators: name: Bavaghar, Mehrdad
name: Aalipour, Rasoul
name: Jamshidi-Ghaleh, Kazem
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We study spectral singularities of an infinite planar slab of homogeneous optically active material in focus of a thin lens under illumination of a Gaussian beam. We describe the field distribution of the Gaussian beam under this configuration as a plane wave propagated near the optical axis which its phase and amplitude vary with distance from center of the beam. Based on this approximation, we carry out the transfer matrix for the slab. We explore the consequences of this configuration on determining the threshold gain of the active medium and tuning the resonance frequencies related to spectral singularities. We show that the spectral singularities and the threshold gain besides that vary with distance from center of the Gaussian beam, also they change with relative aperture of the focusing lens. As a result, using a thin lens with higher relative aperture, the spectral singularities corresponding resonances shift to the higher frequencies (lower wavelengths). Numerical results confirm the theoretical findings
description: 11 pages, 6 figures
Influence of Annealing on the Optical and Scintillation Properties of CaWO$_4$ Single Crystals
Creators: name: Sivers, M. v.
name: Ciemniak, C.
name: Erb, A.
name: Feilitzsch, F. v.
name: Gütlein, A.
name: Lanfranchi, J. -C.
name: Lepelmeier, J.
name: Münster, A.
name: Potzel, W.
name: Roth, S.
name: Strauss, R.
name: Thalhammer, U.
name: Wawoczny, S.
name: Willers, M.
name: Zöller, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We investigate the influence of oxygen annealing on the room temperature optical and scintillation properties of CaWO$_4$ single crystals that are being produced for direct Dark Matter search experiments. The applied annealing procedure reduces the absorption coefficient at the peak position of the scintillation spectrum ($\sim430$ nm) by a factor of $\sim6$ and leads to an even larger reduction of the scattering coefficient. Furthermore, the annealing has no significant influence on the \emph{intrinsic} light yield. An additional absorption occurring at $\sim400$ nm suggests the formation of O$^-$ hole centers. Light-yield measurements at room temperature where one crystal surface was mechanically roughened showed an increase of the \emph{measured} light yield by $\sim40 %$ and an improvement of the energy resolution at 59.5 keV by $\sim12 %$ for the annealed crystal. We ascribe this result to the reduction of the absorption coefficient while the surface roughening is needed to compensate for the also observed reduction of the scattering coefficient after annealing.
CONCERTO at APEX: installation and technical commissioning
Creators: name: Monfardini, A.
name: Beelen, A.
name: Benoit, A.
name: Bounmy, J.
name: Calvo, M.
name: Catalano, A.
name: Goupy, J.
name: Lagache, G.
name: Ade, P.
name: Barria, E.
name: Bethermin, M.
name: Bourrion, O.
name: Bres, G.
name: De Breuck, C.
name: Desert, F. -X.
name: Duvauchelle, G.
name: Fasano, A.
name: Fenouillet, T.
name: Garcia, J.
name: Garde, G.
name: Hoarau, C.
name: Hu, W.
name: Lambert, J. -C.
name: Levy-Bertrand, F.
name: Lundgren, A.
name: Macias-Perez, J.
name: Marpaud, J.
name: Pisano, G.
name: Ponthieu, N.
name: Prieur, L.
name: Roni, S.
name: Roudier, S.
name: Tourres, D.
name: Tucker, C.
name: Cantzler, M.
name: Caro, P.
name: Diaz, M.
name: Duran, C.
name: Montenegro, F.
name: Navarro, M.
name: Olguin, R.
name: Palma, F.
name: Parra, R.
name: Santana, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Applied Physics (physics.app-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We describe the deployment and first tests on Sky of CONCERTO, a large field-of-view (18.6arc-min) spectral-imaging instrument. The instrument operates in the range 130-310GHz from the APEX 12-meters telescope located at 5100m a.s.l. on the Chajnantor plateau. Spectra with R=1-300 are obtained using a fast (2.5Hz mechanical frequency) Fourier Transform Spectrometer (FTS), coupled to a continuous dilution cryostat with a base temperature of 60mK. Two 2152-pixels arrays of Lumped Element Kinetic Inductance Detectors (LEKID) are installed in the cryostat that also contains the cold optics and the front-end electronics. CONCERTO, installed in April 2021, generates more than 20k spectra per second during observations. We describe the final development phases, the installation and the first results obtained on Sky.
description: Submitted to JLTP, Proceedings if the Low Temperature Detectors 19 conference, NIST, 2021
SO(10) Yukawa Unification with mu < 0
Creators: name: Gogoladze, Ilia
name: Shafi, Qaisar
name: Un, Cem Salih
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the low energy implications including particle spectroscopy of SO(10) inspired t-b-tau Yukawa coupling unification with mu < 0, where mu is the coefficient of the bilinear Higgs mixing term of the minimal supersymmetric standard model (MSSM). We imploy non-universal MSSM gaugino masses induced by SO(10) invariant dimension five operators, such that the total number of fundamental parameters is precisely the same as in Yukawa unified supersymmetric SO(10) models with universal gaugino masses and mu > 0. We find that t-b-tau Yukawa unification with mu < 0 is compatible with the current experimental bounds, including the WMAP bound on neutralino dark matter and the measured value of the muon anomalous magnetic moment. We present a variety of benchmark points which include relatively light squarks (~ TeV) of the first two families and an example in which the bottom and top squarks are lighter than the gluino. This is quite distinct from Yukawa unification with mu > 0 and universal gaugino masses in which the gluino is the lightest colored sparticle and the sqaurks of the first two families have masses in the multi-TeV range.
description: 13 pages, 2 figures, 1 table
Simulation of Reflected Brownian motion on two dimensional wedges
Creators: name: Bras, Pierre
name: Kohatsu-Higa, Arturo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H35, 65C05, 65C30

description: We study a correlated Brownian motion in two dimensions, which is reflected, stopped or killed in a wedge represented as the intersection of two half spaces. First, we provide explicit density formulas, hinted by the method of images. These explicit expressions rely on infinite oscillating sums of Bessel functions and may demand computationally costly procedures. We propose suitable recursive algorithms for the simulation of the laws of reflected and stopped Brownian motion which are based on generalizations of the reflection principle in two dimensions. We study and give bounds for the complexity of the proposed algorithms.
description: 35 pages (Supplementary material included)
Power-law distributions and fluctuation-dissipation relation in the stochastic dynamics of two-variable Langevin equations
Creators: name: Du, Jiulin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chemical Physics (physics.chem-ph)
subject: Classical Physics (physics.class-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: We show that the general two-variable Langevin equations with inhomogeneous noise and friction can generate many different forms of power-law distributions. By solving the corresponding stationary Fokker-Planck equation, we can obtain a condition under which these power-law distributions are accurately created in a system away from equilibrium. This condition is an energy-dependent relation between the diffusion coefficient and the friction coefficient and thus it provides a fluctuation-dissipation relation for nonequilibrium systems with power-law distributions. Further, we study the specific forms of the Fokker-Planck equation that correctly leads to such power-law distributions, and then present a possible generalization of Klein-Kramers equation and Smoluchowski equation to a complex system, whose stationary-state solutions are exactly a Tsallis distribution.
description: 18 pages,63 references
Active Stokesian Dynamics
Creators: name: Elfring, Gwynn J.
name: Brady, John F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Since its development, Stokesian Dynamics has been a leading approach for the dynamic simulation of suspensions of particles at arbitrary concentrations with full hydrodynamic interactions. Although originally developed for the simulation of passive particle suspensions, the Stokesian Dynamics framework is equally well suited to the analysis and dynamic simulation of suspensions of active particles, as we elucidate here. We show how the reciprocal theorem can be used to formulate the exact dynamics for a suspension of arbitrary active particles and then show how the Stokesian Dynamics method provides a rigorous way to approximate and compute the dynamics of dense active suspensions where many-body hydrodynamic interactions are important.
description: 16 pages, 3 figures
“Fuzzy front end” practices in innovating Japanese companies
Creators: name: Herstatt, Cornelius
name: Verworn, Birgit
name: Stockstrom, Christoph
name: Nagahira, Akio
name: Takahashi, Osamu
Publisher: name: TUHH Universitätsbibliothek
Year: 2004
Subjects: subject: New product development
subject: Japanese firms
subject: planning
subject: success innovation
classificationCode: 85.15
subject: Forschung und Entwicklung
subject: Produktinnovation
subject: Produktentwicklung
subject: Operations Research
subject: Firma
subject: Japan

description: In this paper, we report on the results of a large-scale study about typical front-end-related innovation practices in 553 Japanese mechanical and electrical engineering companies. We explore typical activities concerning the generation and assessment of new product ideas, the reduction of technological as well as market uncertainty and front end planning. Finally, we report on differences between successful and unsuccessful companies. Our study confirms earlier findings about the frequent use of creativity techniques in Japan during the process of idea generation. We also find companies to intensively involve upper management and customers into NPD projects. While integrating upper management is of vital importance for assessing new product ideas, integrating customers and users is primarily used to developing product ideas and concepts. We further find evidence that successful companies integrate their customers more frequently in the process of developing and assessing new product ideas than non successful companies. In addition, the former integrate customer requirements into their product definitions more often and also translate these requirements into technical specifications more frequently than non-successful companies. Finally, successful companies more often systematically plan a project prior to its start than unsuccessful ones.
Qualitative difference between the angular anisotropy parameters in fast electron scattering and photoionization
Creators: name: Amusia, M. Ya.
name: Chernysheva, L. V.
name: Liverts, E. Z.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It is demonstrated for the first time that in spite of well known big similarities between atomic ionization by photons and fast electrons, a qualitative difference exists in angular anisotropy parameters of electrons knocked out in these processes. The difference is disclosed here and attributed to distinction between normal (transverse) and virtual (longitudinal) photons. Formulas are derived for dipole and non-dipole angular anisotropy parameters in fast electronatom scattering. The ratio of quadrupole-to-dipole matrix elements is determined by the parameter ωR/v << 1 where ωis the transferred in collision energy, R is the ionized shell radius and v is the speed of projectile. This factor can be much bigger than in the case of photoionization, where one has the speed of light c that is much bigger than v . We illustrate general formulas by concrete results for outer s-subshells of noble gas atoms Ar and Xe. Even for very small transferred momentum q, in the so-called optical limit, the deviation from photoionization case is prominent and instructive.
description: 8 pages, 3 figures. arXiv admin note: substantial text overlap with arXiv:1012.5465
Gluon saturation effects on the color singlet J/Psi production in high energy dA and AA collisions
Creators: name: Dominguez, F.
name: Kharzeev, D. E.
name: Levin, E. M.
name: Mueller, A. H.
name: Tuchin, K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We derive the formulae for the cross section of J/Psi production in high energy pA and AA collisions taking into account the gluon saturation/color glass condensate effects. We then perform the numerical calculations of the corresponding nuclear modification factors and find a good agreement between our calculations and the experimental data on J/Psi production in dA collisions. We also observe that cold nuclear modification effects alone cannot describe the data on J/Psi production in AA collisions. Additional final state suppression (at RHIC) and enhancement (at LHC) mechanisms are required to explain the experimental observations.
description: 11 pages, 6 figures
Planckian Dissipation in Metals
Creators: name: Hartnoll, Sean A.
name: Mackenzie, Andrew P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We review the appearance of the Planckian time $τ_\text{Pl} = \hbar/(k_B T)$ in both conventional and unconventional metals. We give a pedagogical discussion of the various different timescales (quasiparticle, transport, many-body) that characterize metals, emphasizing conditions under which these times are the same or different. Throughout, we have attempted to clear up aspects of the problem that had been confusing us, in the hope that this helps the reader as well. We discuss the possibility of a Planckian bound on dissipation from both a quasiparticle and a many-body perspective. Planckian quasiparticles can arise naturally from a combination of inelastic scattering and mass renormalization. Many-body dynamics, on the other hand, is constrained by the basic time- and length- scales of local thermalization.
description: 43 pages + references and appendices. v2: references added and minor improvements to presentation made. v3: further minor improvements to presentation throughout
Too many $X's$, $Y's$ and $Z's$?
Creators: name: Caramés, T. F.
name: Valcarce, A.
name: Vijande, J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A large number of new states have been reported during the last few years in charmonium spectroscopy above the charmed meson production threshold. They have been called $X's$, $Y's$, and $Z's$. We reflect on the influence of thresholds on heavy meson spectroscopy comparing different flavor sectors and quantum numbers. The validity of a quark-model picture above open-flavor thresholds would severely restrict the number of channels that may lodge meson-meson molecules.
description: 8 pages, 5 figures
Sauter-Schwinger effect for colliding laser pulses
Creators: name: Kohlfürst, Christian
name: Ahmadiniaz, Naser
name: Oertel, Johannes
name: Schützhold, Ralf
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Via a combination of analytical and numerical methods, we study electron-positron pair creation by the electromagnetic field ${\bf A}(t,{\bf r})=[f(ct-x)+f(ct+x)]{\bf e}_y$ of two colliding laser pulses. Employing a generalized WKB approach, we find that the pair creation rate along the symmetry plane $x=0$ (where one would expect the maximum contribution) displays the same exponential dependence as for a purely time-dependent electric field ${\bf A}(t)=2f(ct){\bf e}_y$. The pre-factor in front of this exponential does also contain corrections due to focusing or de-focusing effects induced by the spatially inhomogeneous magnetic field. We compare our analytical results to numerical simulations using the Dirac-Heisenberg-Wigner method and find good agreement.
description: Article: 7 pages, 1 figure; Appendix: 9 pages, 5 figures; v3: added discussions on numerics and convergences as well as curvature contributions in the appendix, added new references
Assessment of commercial insect-based pet food products: nutrients’ concentration, labelling adequacy and determination of animal deoxyribonucleic acid (DNA)
Creators: name: Baptista da Silva, C.
name: Santos Neto, E.L.
name: Vermeir, P.
name: De Leersnyder, I.
name: Eeckhout, M.
name: Hesta, M.
Publisher: name: Brill Online
Year: 2025
Subjects: classificationCode: 309999
subject: Other agricultural, veterinary and food sciences not elsewhere classified

description: Over recent years, the availability of insect-based pet food products has increased. However, concerns have arisen regarding potential nutritional challenges associated with using edible insects in pet food, and no studies have yet evaluated the adequacy of these products. This study assessed the nutrient composition and labelling accuracy of twenty-nine commercially available insect-based pet foods. Of these, twenty-four were dog products (four for growth, seventeen for adults, three for all life stages) and five were cat products (two for adults, three for all life stages), all labelled as complete and balanced. The products were analysed for proximate composition, essential amino acids, and mineral content (calcium, phosphorus, potassium, magnesium, copper, iron, zinc, selenium, mercury, and molybdenum) according to AOAC guidelines. The results were compared with label declarations, considering nutritional and legal tolerances, as well as recommendations from FEDIAF and NRC for the intended species and life stages (g/1000 kcal ME). Heavy metals were compared to maximum tolerable limits from the FDA. The twenty products labelled as ‘hypoallergenic’ were assessed for animal DNA using next-generation sequencing. The analysis revealed that 22 products (76%) did not comply with declared nutritional values and tolerances for at least one nutrient, with nine products (31%) showing discrepancies in two or more; key issues were in crude fibre and metabolizable energy. Three products (10%) met FEDIAF’s recommendations, and seventeen (59%) met NRC’s recommendations. Only one (3%) adhered to both label and FEDIAF’s recommendations. Most nutritional inadequacies were seen in selenium, calcium, phosphorus, Ca/P ratios, and taurine, potentially posing health risks to pets. Furthermore, fifteen out of twenty (75%) hypoallergenic-labelled products complied with the labelled species. Despite the potential benefits of insect-based pet foods, this study underscores the need for further research and stricter quality control to ensure safety and efficacy, ultimately improving pet nutrition and consumers’ trust.
Gabriele Körlin / Gerd Weisgerber, (Hrsg.), Stone Age - Mining Age
Creators: name: Cziesla, Erwin
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2020

description: Rezension zu: Gabriele Körlin / Gerd Weisgerber, (Hrsg.), Stone Age - Mining Age. Montanhistorische Zeitschrift DER ANSCHNITT Beiheft 19 = Veröffentlichungen aus dem Deutschen Bergbau-Museum Bochum Band 148. Deutsches Bergbau-Museum, Bochum 2006. ISBN 978-3-937203-27-0. 608 Seiten mit zahlreichen Abbildungen
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 88 2010(2013)
Photonic chip-based continuous-travelling-wave parametric amplifier
Creators: name: Riemensberger, Johann
name: Liu, Junqiu
name: Kuznetsov, Nikolai
name: He, Jijun
name: Wang, Rui Ning
name: Kippenberg, Tobias J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The ability to amplify optical signals is of pivotal importance across science and technology. The development of optical amplifiers has revolutionized optical communications, which are today pervasively used in virtually all sensing and communication applications of coherent laser sources. In the telecommunication bands, optical amplifiers typically utilize gain media based on III-V semiconductors or rare-earth-doped fibers. Another way to amplify optical signals is to utilize the Kerr nonlinearity of optical fibers or waveguides via parametric processes. Such parametric amplifiers of travelling continuous wave have been originally developed in the microwave domain, and enable quantum-limited signal amplification with high peak gain, broadband gain spectrum tailored via dispersion control, and ability to enable phase sensitive amplification. Despite these advantages, optical amplifiers based on parametric gain have proven impractical in silica fibers due to the low Kerr nonlinearity. Recent advances in photonic integrated circuits have revived interest in parametric amplifiers due to the significantly increased nonlinearity in various integrated platforms. Yet, despite major progress, continuous-wave-pumped parametric amplifiers built on photonic chips have to date remained out of reach. Here we demonstrate a chip-based travelling-wave optical parametric amplifier with net signal gain in the continuous-wave regime. Using ultralow-loss, dispersion-engineered, meter-long, silicon nitride photonic integrated circuits that are tightly coiled on a photonic chip, we achieve a continuous parametric gain of 12 dB that exceeds both the on-chip optical propagation loss and fiber-chip-fiber coupling losses in the optical C-band.
Intrinsic Energy Dissipation in CVD-Grown Graphene Nanoresonators
Creators: name: Qi, Zenan
name: Park, Harold S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We utilize classical molecular dynamics to study the the quality (Q)-factors of monolayer CVD-grown graphene nanoresonators. In particular, we focus on the effects of intrinsic grain boundaries of different orientations, which result from the CVD growth process, on the Q-factors. For a range of misorientations orientation angles that are consistent with those seen experimentally in CVD-grown graphene, i.e. 0$^{\circ}$ to $\sim20^{\circ}$, we find that the Q-factors for graphene with intrinsic grain boundaries are 1-2 orders of magnitude smaller than that of pristine monolayer graphene. We find that the Q-factor degradation is strongly influenced by both the symmetry and structure of the 5-7 defect pairs that occur at the grain boundary. Because of this, we also demonstrate that find the Q-factors CVD-grown graphene can be significantly elevated, and approach that of pristine graphene, through application of modest (1%) tensile strain.
description: 6 pages, 10 figures
Systematische Untersuchungen von Slamming-Drücken mit Hilfe von Dreh-Fall-Versuchen in Wellen
Creators: name: Schenzle, Peter
name: Broelmann, Jobst
name: Blume, Peter
Publisher: name: TUHH Universitätsbibliothek
Year: 1971
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Systematische Untersuchungen von Slamming-Drücken mit Hilfe von Dreh-Fall-Versuchen in Wellen
Tailoring Instantaneous Time Mirrors for Time Reversal Focusing in Absorbing Media
Creators: name: Wu, Crystal T.
name: Nobre, Nuno M.
name: Fort, Emmanuel
name: Riley, Graham D.
name: Costen, Fumie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Physics (physics.class-ph)
subject: Medical Physics (physics.med-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The time reversal symmetry of the wave equation allows wave refocusing back at the source. However, this symmetry does not hold in lossy media. We present a new strategy to compensate wave amplitude losses due to attenuation. The strategy leverages the instantaneous time mirror (ITM) which generates reversed waves by a sudden disruption of the medium properties. We create a heterogeneous ITM whose disruption is unequal throughout the space to create waves of different amplitude. The time-reversed waves can then cope with different attenuation paths as typically seen in heterogeneous and lossy environments. We consider an environment with biological tissues and apply the strategy to a two-dimensional digital human phantom from the abdomen. A stronger disruption is introduced where the forward waves suffer a history of higher attenuation, with a weaker disruption elsewhere. Computer simulations show heterogeneous ITM is a promising technique to improve time reversal refocusing in heterogeneous, lossy, and dispersive spaces.
description: 11 pages, 11 figures
Theoretical light curves of dipole oscillations in roAp stars
Creators: name: Bigot, L.
name: Kurtz, D. W.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. The dipole modes are the most common geometry of oscillations in roAp stars inferred from photometric measurements and are therefore of special interest for asteroseismic purposes. Aims. We present a theoretical and analytical study of the light curves associated with dipole (l = 1) pulsations of roAp stars in the framework of the revisited oblique pulsator model. Methods. We describe the light curves in terms of the inclination and polarization of the elliptical displacement vector of the dipole modes. We study the influence of the magnetic field and rotation on the shape of these light curves for both amplitudes and phases. Results. Despite the inclination of dipole mode with respect to the magnetic axis, we find that the dipole mode can have maxima that are in phase with the magnetic maxima. We apply our formalism to the well-known roAp star HR 3831 (HD 83368) to derive its mode properties. Our results are similar to those obtained by time-series spectroscopy. We also consider the cases of three other roAp stars, HD 6532, HD 99563, and HD 128898 (α Cir). Conclusions. We demonstrate that the formalism of the revisited oblique pulsator model is adequate to explain the properties of the photometric light curves associated with dipole modes in roAp stars. In addition, we show that the coincidence of pulsation and magnetic extrema can also occur for inclined modes with respect to the magnetic axis. With the stars considered in this paper, we conclude that the polarization of the modes present in roAp stars are quasi linearly polarized.
description: In press for Astronomy and Astrophysics, 13 pages, 5 figures
On the number of eigenvalues of a rational eigenproblem
Creators: name: Mazurenko, Lada
name: Voß, Heinrich
Publisher: name: TUHH Universitätsbibliothek
Year: 2003
Subjects: subject: rational eigenvalue problem
subject: fluid-solid vibrations
subject: vibrations of a plate with attached masses
classificationCode: 510
subject: Mathematik
subject: Eigenwertproblem
classificationCode: 35P30
subject: Nonlinear eigenvalue problems, nonlinear spectral theory for PDO

description: In this paper we determine the number of eigenvalues of a rational eigenvalue problem governing free vibrations of a plate with elastically attached masses or the mechanical vibrations of a fluid-solid structure.
Towards a statistical physics of dating apps
Creators: name: Olmeda, Fabrizio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Over the last ten years, a sharp rise in the number of dating apps has broadened the spectrum of how one can get in contact with new acquaintances. A common feature of such apps is a swipe enabling a user to decide whether to like or dislike another user. As is the case in real life, a user may be more or less popular, which implies the distribution of likes among different users is not trivial. In this paper we show how likes are distributed across users, based on different decision-making strategies and on different app settings. We apply theoretical methods originally developed in stochastic and coagulation processes to the investigation into the dynamics of dating app networks. More specifically, we show that whenever a dating app differentially displays different users with respect to their popularity in different models, users are split into two categories: a first category including users who have received most likes and a second category, referred to as a condensate, which in the long-term will be reduced to a small fraction of likes or to no likes at all. Finally, we explore different models based on a rating system of the users, known as Elo. These models will turn out to exhibit behaviour typical of gelating systems and non-trivial distribution of Elo rating.
Tafeln
Creators: name: Redaktion, Die
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2020

description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Bd. 23 Nr. 11 (1970): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Increasing flammability resistance for aircrafts tires by using magnesium hydroxide
Creators: name: I.Al-Mosawi, Ali
Publisher: name: figshare
Year: 2021
Subjects: subject: 91209 Polymers and Plastics
subject: FOS: Materials engineering

description: Aircraft tire must withstand and a wide range of operational conditions .When on the ground ,it must support the weight of the aircraft . During taxi ,it must provide a stable cushioned ride while resisting heat generation ,abrasion and wear. When aircraft down ,the tire may be fired because high friction with ground .So to protect aircrafts tires from fires Magnesium hydroxide was used in various quantities (10%,20%,30%) as a flame retardant to enhancement flame retardancy for tires material . Magnesium hydroxide was added with master batch of tire and then exposed the resulting material to a direct flame generated from gas flame (2000ºC) with flame exposure distance (10 mm), and study the range of tire resistance to the flame and the range protected of hydroxide addition . Method of measuring the surface temperature opposite to the flame was used to determined the heat transferred through tire material . The results was obtained from thermal erosion test shows improved flammability resistance for tire by added magnesium hydroxide and this resistance increased by increasing hydroxide percentage .
Constraining the dark energy models using Baryon Acoustic Oscillations: An approach independent of $H_0 \cdot r_d$
Creators: name: Staicova, Denitsa
name: Benisty, David
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The $H_0$ tension and the accompanying $r_d$ tension are a hot topic in current cosmology. In order to remove the degeneracy between the Hubble parameter $H_0$ and the sound horizon scale $r_d$ from the Baryon Acoustic Oscillations (BAO) datasets, we redefine the likelihood by marginalizing over the $H_0 \cdot r_d$ parameter and then we perform full Bayesian analysis for different models of dark energy (DE). We find that our uncalibrated by early or late physics {datasets cannot} constrain the DE models properly without further assumptions. By adding the type IA supernova dataset, the models are constrained better with smaller errors on the DE parameters. The two BAO datasets we use -- one with angular measurements and one with angular and radial ones with their covariances, show statistical preferences for different models, with $Λ$CDM being the best model for one of them. Adding the Pantheon SnIA dataset with its covariance matrix boosts the statistical preference for $Λ$CDM.
description: accepted for publishing in Astronomy and Astrophysics
Kenterversuche mit einem Modell in natürlichem Seegang
Creators: name: Kastner, Sigismund
Publisher: name: TUHH Universitätsbibliothek
Year: 1962
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Kenterversuche mit einem Modell in natürlichem Seegang
Eine Hügelgräberuntersuchung bei Oldendorf, Kr. Harburg
Creators: name: Körner, Gerhard
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2020

description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 10 (1936): Nachrichten aus Niedersachsens Urgeschichte
Digital Holography at Shot Noise Level
Creators: name: Verpillat, Frédéric
name: Joud, Fadwa
name: Atlan, Michael
name: Gross, Michel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: By a proper arrangement of a digital holography setup, that combines off-axis geometry with phase-shifting recording conditions, it is possible to reach the theoretical shot noise limit, in real-time experiments.We studied this limit, and we show that it corresponds to 1 photo-electron per pixel within the whole frame sequence that is used to reconstruct the holographic image. We also show that Monte Carlo noise synthesis onto holograms measured at high illumination levels enables accurate representation of the experimental holograms measured at very weak illumination levels. An experimental validation of these results is done.
Bittel, Kurt. Die Kelten in Württemberg
Creators: name: Jacob-Friesen, Karl Hermann
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2020

description: Rezension zu: Bittel, Kurt. Die Kelten in Württemberg. Band VIII der römisch-germanischen Forschungen. 4°, 128 Seiten mit 35 Tafeln. Berlin und Leipzig 1934, Walter de Gruyter & Co.
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 10 (1936): Nachrichten aus Niedersachsens Urgeschichte