cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Chemical abundances of distant extremely metal-poor unevolved stars
Creators: name: Bonifacio, P.
name: Sbordone, L.
name: Caffau, E.
name: Ludwig, H. -G.
name: Spite, M.
name: Hernández, J. I. González
name: Behara, N. T.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Aims: The purpose of our study is to determine the chemical composition of a sample of 16 candidate Extremely Metal-Poor (EMP) dwarf stars, extracted from the Sloan Digital Sky Survey (SDSS). There are two main purposes: in the first place to verify the reliability of the metallicity estimates derived from the SDSS spectra; in the second place to see if the abundance trends found for the brighter nearer stars studied previously also hold for this sample of fainter, more distant stars. Methods: We used the UVES at the VLT to obtain high-resolution spectra of the programme stars. The abundances were determined by an automatic analysis with the MyGIsFOS code, with the exception of lithium, for which the abundances were determined from the measured equivalent widths of the Li I resonance doublet. Results: All candidates are confirmed to be EMP stars, with [Fe/H]<= -3.0. The chemical composition of the sample of stars is similar to that of brighter and nearer samples. We measured the lithium abundance for 12 stars and provide stringent upper limits for three other stars, for a fourth star the upper limit is not significant, owing to the low signal-to noise ratio of the spectrum. The "meltdown" of the Spite plateau is confirmed, but some of the lowest metallicity stars of the sample lie on the plateau. Conclusions: The concordance of the metallicities derived from high-resolution spectra and those estimated from the SDSS spectra suggests that the latter may be used to study the metallicity distribution of the halo. The abundance pattern suggests that the halo was well mixed for all probed metallicities and distances. The fact that at the lowest metallicities we find stars on the Spite plateau suggests that the meltdown depends on at least another parameter, besides metallicity. (abridged)
description: A&A in press
title: "Statua di Ercole in assalto", arte romana, inv. CCXCVIII (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Ciccarello, Giulia
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di

Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en
Dynamically crossing diabolic points while encircling exceptional curves: A programmable symmetric-asymmetric multimode switch
Creators: name: Arkhipov, Ievgen I.
name: Miranowicz, Adam
name: Minganti, Fabrizio
name: Özdemir, Şahin K.
name: Nori, Franco
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Nontrivial spectral properties of non-Hermitian systems can lead to intriguing effects with no counterparts in Hermitian systems. For instance, in a two-mode photonic system, by dynamically winding around an exceptional point (EP) a controlled asymmetric-symmetric mode switching can be realized. That is, the system can either end up in one of its eigenstates, regardless of the initial eigenmode, or it can switch between the two states on demand, by simply controlling the winding direction. However, for multimode systems with higher-order EPs or multiple low-order EPs, the situation can be more involved, and the ability to control asymmetric-symmetric mode switching can be impeded, due to the breakdown of adiabaticity. Here we demonstrate that this difficulty can be overcome by winding around exceptional curves by additionally crossing diabolic points. We consider a four-mode $\cal PT$-symmetric bosonic system as a platform for experimental realization of such a multimode switch. Our work provides alternative routes for light manipulations in non-Hermitian photonic setups.
description: 10+5 pages, 5+7 figures
Fitting Blazhko light curves
Creators: name: Szeidl, B.
name: Jurcsik, J.
name: Sódor, Á.
name: Hajdu, G.
name: Smitola, P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The correct amplitude and phase modulation formalism of the Blazhko modulation is given. The harmonic order dependent amplitude and phase modulation form is equivalent with the Fourier decomposition of multiplets. The amplitude and phase modulation formalism used in electronic transmission technique as introduced by Benkő, Szabó and Paparó (2011, MNRAS 417, 974) for Blazhko stars oversimplifies the amplitude and phase modulation functions thus it does not describe the light variation in full detail. The results of the different formalisms are compared and documented by fitting the light curve of a real Blazhko star, CM UMa.
description: 8 pages, 5 figures. Accepted for publication in MNRAS
Herschel/HerMES: The X-ray - Infrared correlation for star-forming galaxies at z~1
Creators: name: Symeonidis, M.
name: Georgakakis, A.
name: Seymour, N.
name: Auld, R.
name: Bock, J.
name: Brisbin, D.
name: Buat, V.
name: Burgarella, D.
name: Chanial, P.
name: Clements, D. L.
name: Cooray, A.
name: Eales, S.
name: Farrah, D.
name: Franceschini, A.
name: Glenn, J.
name: Griffin, M.
name: Hatziminaoglou, E.
name: Ibar, E.
name: Ivison, R. J.
name: Mortier, A. M. J.
name: Oliver, S. J.
name: Page, M. J.
name: Papageorgiou, A.
name: Pearson, C. P.
name: Pérez-Fournon, I.
name: Pohlen, M.
name: Rawlings, J. I.
name: Raymond, G.
name: Rodighiero, G.
name: Roseboom, I. G.
name: Rowan-Robinson, M.
name: Scott, Douglas
name: Smith, A. J.
name: Tugwell, K. E.
name: Vaccari, M.
name: Vieira, J. D.
name: Vigroux, L.
name: Wang, L.
name: Wright, G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: For the first time, we investigate the X-ray/infrared (IR) correlation for star-forming galaxies at z~1, using SPIRE submm data from the recently-launched Herschel Space Observatory and deep X-ray data from the 2Ms Chandra deep field north (CDFN) survey. We examine the X-ray/IR correlation in the soft X-ray (SX, 0.5-2 keV) and hard X-ray (HX, 2-10 keV) bands by comparing our z~1 SPIRE-detected star-forming galaxies (SFGs) to equivalently IR-luminous (L_IR >10^10 L_sun) samples in the local/low redshift Universe. Our results suggest that the X-ray/IR properties of the SPIRE SFGs are on average similar to those of their local counterparts, as we find no evidence for evolution in the L_SX/L_IR and L_HX/L_IR ratios with redshift. We note however, that at all redshifts, both L_SX/L_IR and L_HX/L_IR are strongly dependent on IR luminosity, with luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs,L_IR >10^11 L_sun) having up to an order of magnitude lower values than normal infrared galaxies (L_IR <10^11 L_sun). We derive a L_SX-L_IR relation and confirm the applicability of an existing L_HX-L_IR relation for both local and distant LIRGs and ULIRGs, consistent with a scenario where X-ray luminosity is correlated with the star-formation rate (SFR).
description: 16 pages, 6 figures, accepted for publication in MNRAS
Regelungsverfahren für dieselelektrische Schiffsantriebe für hohe dynamische Anforderungen
Creators: name: Banek, Robert Benjamin
Publisher: name: TUHH Universitätsbibliothek
Year: 2019
Subjects: subject: dieselelektrisch
subject: Schiffsantrieb
subject: power management
subject: Lastaufschaltvermögen
subject: Propellerdrehzahl
classificationCode: 600
subject: Technik

description: Bei Schiffen mit dieselelektrischen Antrieben muss die Leistung der Fahrmotoren begrenzt werden, um eine Überlastung der Dieselgeneratoren zu verhindern. Als Alternative zur heute üblichen Begrenzung durch Propellerdrehzahlrampen wird eine dynamische Begrenzung entwickelt, welche das momentane Lastaufschaltvermögen der Dieselgeneratoren berücksichtigt. Das momentane Lastaufschaltvermögen wird dabei durch wenig rechenintensive Hammerstein-Modelle ermittelt. Eine solche optimierte Begrenzung der Fahrmotoren kann die dynamische Leistungsfähigkeit des dieselelektrischen Antriebs deutlich verbessern.
description: On ships with diesel electric drive trains the power consumption of the prolusion motors has to be limited to prevent overloading of the diesel generators. As an alternative to the state-of-the-art limitation of the change rate of propulsion speed a dynamic limitation is developed that takes the current load acceptance capability into account. In this case the current load acceptance capability is computed using Hammerstein-Models that require only little computation work. Such dynamic limitation of the propulsion motors can improve the dynamic capability of the diesel electric drive train significantly.
Scalable Spectral Clustering with Group Fairness Constraints
Creators: name: Wang, Ji
name: Lu, Ding
name: Davidson, Ian
name: Bai, Zhaojun
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: There are synergies of research interests and industrial efforts in modeling fairness and correcting algorithmic bias in machine learning. In this paper, we present a scalable algorithm for spectral clustering (SC) with group fairness constraints. Group fairness is also known as statistical parity where in each cluster, each protected group is represented with the same proportion as in the entirety. While FairSC algorithm (Kleindessner et al., 2019) is able to find the fairer clustering, it is compromised by high costs due to the kernels of computing nullspaces and the square roots of dense matrices explicitly. We present a new formulation of underlying spectral computation by incorporating nullspace projection and Hotelling's deflation such that the resulting algorithm, called s-FairSC, only involves the sparse matrix-vector products and is able to fully exploit the sparsity of the fair SC model. The experimental results on the modified stochastic block model demonstrate that s-FairSC is comparable with FairSC in recovering fair clustering. Meanwhile, it is sped up by a factor of 12 for moderate model sizes. s-FairSC is further demonstrated to be scalable in the sense that the computational costs of s-FairSC only increase marginally compared to the SC without fairness constraints.
Measuring e-Commerce Metric Changes in Online Experiments
Creators: name: Liu, C. H. Bryan
name: McCoy, Emma J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Applications (stat.AP)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Digital technology organizations routinely use online experiments (e.g. A/B tests) to guide their product and business decisions. In e-commerce, we often measure changes to transaction- or item-based business metrics such as Average Basket Value (ABV), Average Basket Size (ABS), and Average Selling Price (ASP); yet it remains a common pitfall to ignore the dependency between the value/size of transactions/items during experiment design and analysis. We present empirical evidence on such dependency, its impact on measurement uncertainty, and practical implications on A/B test outcomes if left unmitigated. By making the evidence available, we hope to drive awareness of the pitfall among experimenters in e-commerce and hence encourage the adoption of established mitigation approaches. We also share lessons learned when incorporating selected mitigation approaches into our experimentation analysis platform currently in production.
description: To appear in WWW '23 Companion. 5 pages, 4 figures, 2 tables. The experiment code and results on the two publicly available datasets are available on GitHub/Zenodo: https://doi.org/10.5281/zenodo.7659092. This version supersedes a previous working paper with a different title
On Two-generated Non-commutative Algebras Subject to the Affine Relation
Creators: name: Koutschan, Christoph
name: Levandovskyy, Viktor
name: Motsak, Oleksandr
Publisher: name: arXiv
Year: 2011
Subjects: subject: Symbolic Computation (cs.SC)
subject: Rings and Algebras (math.RA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We consider algebras over a field K, generated by two variables x and y subject to the single relation yx = qxy + ax + by + c for q in K^* and a, b, c in K. We prove, that among such algebras there are precisely five isomorphism classes. The representatives of these classes, which are ubiquitous operator algebras, are called model algebras. We derive explicit multiplication formulas for y^m*x^n in terms of standard monomials x^i*y^j for many algebras of the considered type. Such formulas are used in establishing formulas of binomial type and in implementing non-commutative multiplication in a computer algebra system. By using the formulas we also study centers and ring-theoretic properties of the non-commutative model algebras.
description: 13 pages, 5 tables
Focal and Connectomic Mapping of Transiently Disrupted Brain Function
Creators: name: Elmalem, Michael S.
name: Moody, Hanna
name: Ruffle, James K.
name: de Schotten, Michel Thiebaut
name: Haggard, Patrick
name: Diehl, Beate
name: Nachev, Parashkev
name: Jha, Ashwani
Publisher: name: arXiv
Year: 2022
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: The distributed nature of the neural substrate, and the difficulty of establishing necessity from correlative data, combine to render the mapping of brain function a far harder task than it seems. Methods capable of combining connective anatomical information with focal disruption of function are needed to disambiguate local from global neural dependence, and critical from merely coincidental activity. Here we present a comprehensive framework for focal and connective spatial inference based on sparse disruptive data, and demonstrate its application in the context of transient direct electrical stimulation of the human medial frontal wall during the pre-surgical evaluation of patients with focal epilepsy. Our framework formalizes voxel-wise mass-univariate inference on sparsely sampled data within the statistical parametric mapping framework, encompassing the analysis of distributed maps defined by any criterion of connectivity. Applied to the medial frontal wall, this transient dysconnectome approach reveals marked discrepancies between local and distributed associations of major categories of motor and sensory behaviour, revealing differentiation by remote connectivity to which purely local analysis is blind. Our framework enables disruptive mapping of the human brain based on sparsely sampled data with minimal spatial assumptions, good statistical efficiency, flexible model formulation, and explicit comparison of local and distributed effects.
title: "Testa femminile restaurata come Cerere, su busto moderno", arte romana, inv. CCXII (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Clementi, Jessica
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di

Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en
General Relativity and Weyl Geometry
Creators: name: Romero, C.
name: Fonseca-Neto, J. B.
name: Pucheu, M. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that the general theory of relativity can be formulated in the language of Weyl geometry. We develop the concept of Weyl frames and point out that the new mathematical formalism may lead to different pictures of the same gravitational phenomena. We show that in an arbitrary Weyl frame general relativity, which takes the form of a scalar-tensor gravitational theory, is invariant with respect to Weyl tranformations. A kew point in the development of the formalism is to build an action that is manifestly invariant with respect to Weyl transformations. When this action is expressed in terms of Riemannian geometry we find that the theory has some similarities with Brans-Dicke gravitational theory. In this scenario, the gravitational field is not described by the metric tensor only, but by a combination of both the metric and a geometrical scalar field. We illustrate this point by, firstly, discussing the Newtonian limit in an arbitrary frame, and, secondly, by examining how distinct geometrical and physical pictures of the same phenomena may arise in different frames. To give an example, we discuss the gravitational spectral shift as viewed in a general Weyl frame. We further explore the analogy of general relativity with scalar-tensor theories and show how a known Brans-Dicke vacuum solution may appear as a solution of general relativity theory when reinterpreted in a particular Weyl frame. Finally, we show that the so-called WIST gravity theories are mathematically equivalent to Brans-Dicke theory when viewed in a particular frame.
description: LATEX, 22 pages
n/p-Harmonic maps: regularity for the sphere case
Creators: name: Da Lio, Francesca
name: Schikorra, Armin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We introduce n/p-harmonic maps as critical points of E(v) the Lp-Norm of the alpha-laplacian of v, where pointwise v maps Rn into a sphere, and alpha = n/p. This energy combines the non-local behaviour of the fractional harmonic maps introduced by Riviere and the first author with the degenerate arguments of the n-laplacian. In this setting, we will prove Holder continuity.
Coherently averaged dual-comb spectroscopy with a low-noise and high-power free-running gigahertz dual-comb laser
Creators: name: Phillips, C. R.
name: Willenberg, B.
name: Nussbaum-Lapping, A.
name: Callegari, F.
name: Camenzind, S. L.
name: Pupeikis, J.
name: Keller, U.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a new type of dual optical frequency comb source capable of scaling applications to high measurement speeds while combining high average power, ultra-low noise operation, and a compact setup. Our approach is based on a diode-pumped solid-state laser cavity which includes an intracavity biprism operated at Brewster angle to generate two spatially-separated modes with highly correlated properties. The 15-cm-long cavity uses an Yb:CALGO crystal and a SESAM as an end mirror to generate more than 3 W average power per comb, below 80 fs pulse duration, a repetition rate of 1.03 GHz, and a continuously tunable repetition rate difference up to 27 kHz. We carefully investigate the coherence properties of the dual-comb by a series of heterodyne measurements, revealing several important features: (1) ultra-low jitter on the uncorrelated part of the timing noise; (2) the radio frequency comb lines of the interferograms are fully resolved in free-running operation; (3) we validate that through a simple measurement of the interferograms we can determine the fluctuations of the phase of all the radio frequency comb lines; (4) this phase information is used in a post-processing routine to perform coherently averaged dual-comb spectroscopy of acetylene (C2H2) over long timescales. Our results represent a powerful and general approach to dual-comb applications by combining low noise and high power operation directly from a highly compact laser oscillator.
description: Corrected equation 8
International Year of the Salmon 2022 Pan-Pacific High Seas Expedition Data Policy
Creators: name: International Year Of The Salmon Secretariat
Publisher: name: Zenodo
Year: 2022
Subjects: International Year of the Salmon
Salmon
Data Sharing
Policy

description: This policy was developed by Brett Johnson, Tim van der Stap, Caroline Graham, and the Country Lead Scientists from the International Year of the Salmon.
Phase transitions of quasistationary states in the Hamiltonian Mean Field model
Creators: name: de Buyl, Pierre
name: Fanelli, Duccio
name: Ruffo, Stefano
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The out-of-equilibrium dynamics of the Hamiltonian Mean Field (HMF) model is studied in presence of an externally imposed magnetic field h. Lynden-Bell's theory of violent relaxation is revisited and shown to adequately capture the system dynamics, as revealed by direct Vlasov based numerical simulations in the limit of vanishing field. This includes the existence of an out-of-equilibrium phase transition separating magnetized and non magnetized phases. We also monitor the fluctuations in time of the magnetization, which allows us to elaborate on the choice of the correct order parameter when challenging the performance of Lynden-Bell's theory. The presence of the field h removes the phase transition, as it happens at equilibrium. Moreover, regions with negative susceptibility are numerically found to occur, in agreement with the predictions of the theory.
description: 6 pages, 7 figures
Distributed Predictive Cooperative Control of Smart Power Converters in Microgrids
Creators: Oluleke Babayomi
Publisher: name: IEEE
Year: 2025

PELS Webinar Slides

Abstract:Microgrids are key enablers of a sustainable, reliable and resilient electrical power grid. They facilitate the integration of distributed renewable energy sources to the grid, and ensure reliable power supply during grid uncertainties. The potential of microgrids can be fully realized by the deployment of smart power electronic converters with self-awareness, adaptability, autonomy, cooperativeness, and plug and play features. Nonetheless, the multivariable and multi-timescale requirements of microgrids make the conventional linear control of power converters both cumbersome and slower in dynamic response. Hence, the application of nonlinear optimal control techniques like model predictive control (MPC) has become necessary. This talk presents recent advances to the robust predictive control and distributed cooperative control of power converters in microgrids. First, it provides an overview of MPC and the motivation for its application to microgrids. Next, it introduces model-free predictive control using multifrequency extended state observers (ESO), i.e., cascade ESO, hybrid cascade-parallel ESO, and hybrid parallel-cascade ESO, for improved disturbance rejection and measurement noise suppression. In addition, the applications of these robust solutions to grid-connected dc/ac power converters, dc/dc converters for energy storage systems, and renewable energy conversion are presented. Finally, the distributed cooperative secondary control of voltage and frequency for inertia-enhanced grid-forming power converters is discussed. Theoretical analyses and experimental results for the proposed solutions are provided.
External Inverse-Compton and Proton Synchrotron Emission from the Reverse Shock as the Origin of VHE Gamma-Rays from the Hyper-Bright GRB 221009A
Creators: name: Zhang, B. Theodore
name: Murase, Kohta
name: Ioka, Kunihito
name: Song, Deheng
name: Yuan, Chengchao
name: Mészáros, Péter
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The detection of the hyper-bright gamma-ray burst (GRB) 221009A enables us to explore the nature of GRB emission and the origin of very-high-energy (VHE) gamma-rays. We analyze the ${\it Fermi}$-LAT data and investigate GeV-TeV emission in the framework of the external reverse shock model. We show that early $\sim1-10$ GeV emission can be explained by the external inverse-Compton mechanism via upscattering MeV gamma-rays by electrons accelerated at the reverse shock, in addition to the synchrotron self-Compton component. The predicted early optical flux could have been brighter than the naked-eye GRB 080319B. We also show that proton synchrotron emission from accelerated ultra-high-energy cosmic rays (UHECRs) is detectable, and could potentially explain $\gtrsim \rm TeV$ photons detected by LHAASO or UHECR acceleration can be constrained. Our model suggests that the detection of $\mathcal{O}(10\rm~TeV)$ photons with energy up to $\sim18$ TeV is possible for reasonable models of the extragalactic background light without invoking new physics, and predicts anti-correlations between MeV photons and TeV photons, which can be tested with the LHAASO data.
description: 9 pages, 4 figures, accepted for publication in ApJL. Results and figures are updated, and the main conclusions remain unchanged
title: "Gruppo di amazzone con due greci", arte romana, inv. CCXLV (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Ciccarello, Giulia
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di

Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en
The Constraints and Spectra of a Deformed Quantum Mechanics
Creators: name: Ching, Chee-Leong
name: Parwani, Rajesh R.
name: Singh, Kuldip
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We examine a deformed quantum mechanics in which the commutator between coordinates and momenta is a function of momenta. The Jacobi identity constraint on a two-parameter class of such modified commutation relations (MCR's) shows that they encode an intrinsic maximum momentum; a sub-class of which also imply a minimum position uncertainty. Maximum momentum causes the bound state spectrum of the one-dimensional harmonic oscillator to terminate at finite energy, whereby classical characteristics are observed for the studied cases. We then use a semi-classical analysis to discuss general concave potentials in one dimension and isotropic power-law potentials in higher dimensions. Among other conclusions, we find that in a subset of the studied MCR's, the leading order energy shifts of bound states are of opposite sign compared to those obtained using string-theory motivated MCR's, and thus these two cases are more easily distinguishable in potential experiments.
description: 30 pages inclusive of 7 figures
Exploiting In-Constraint Energy in Constrained Variational Quantum Optimization
Creators: name: Hao, Tianyi
name: Shaydulin, Ruslan
name: Pistoia, Marco
name: Larson, Jeffrey
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Emerging Technologies (cs.ET)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: A central challenge of applying near-term quantum optimization algorithms to industrially relevant problems is the need to incorporate complex constraints. In general, such constraints cannot be easily encoded in the circuit, and the quantum circuit measurement outcomes are not guaranteed to respect the constraints. Therefore, the optimization must trade off the in-constraint probability and the quality of the in-constraint solution by adding a penalty for constraint violation into the objective. We propose a new approach for solving constrained optimization problems with unconstrained, easy-to-implement quantum ansatze. Our method leverages the in-constraint energy as the objective and adds a lower-bound constraint on the in-constraint probability to the optimizer. We demonstrate significant gains in solution quality over directly optimizing the penalized energy. We implement our method in QVoice, a Python package that interfaces with Qiskit for quick prototyping in simulators and on quantum hardware.
Effect of Ni, Fe Intercalation on the Superconducting Properties of ZrTe3
Creators: name: Yadav, C. S.
name: Paulose, P. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report the superconductivity at enhanced temperature of 5.2 K in the polycrystalline sample of ZrTe3 and Ni intercalated ZrTe3. ZrTe3 is a Charge Density Wave (T = 63K) compound, which is known to superconduct only below 2K in single crystalline form. We discuss that the intergrain strains in the polycrystalline samples induces an intrinsic pressure and thus enhances the transition temperature. Fe intercalation of ZrTe3 kills both the charge density wave and superconducting states, gives rise to the magnetic ordering in the compound.
description: 2 pages. 3 figures: DAE-Solid State Physics Symposium, 2011
Effects of a micro-intervention aimed at reducing the level of unpleasant dreams
Creators: name: Malouff, John
name: Johnson, Caitlin
Publisher: name: International Journal of Dream Research
Year: 2020

description: One-hundred and twenty-six adults participated in an experiment to test whether an online micro-intervention would reduce the level of unpleasant dreams. The intervention involved asking participants to recall vividly positive events of the day just before going to sleep. The results showed that the intervention led to a significantly lower level of unpleasant dreams in the experimental group the night after the intervention than in a waiting list control. The results indicate that the low-cost, easily disseminated intervention is worthy of further evaluation to determine whether the effects endure over time and whether the effects extend to children and to individuals who have PTSD.
description: International Journal of Dream Research, Vol 13, No 1 (April 2020)
Weak solutions to the barotropic Navier-Stokes system with slip boundary conditions in time dependent domains
Creators: name: Feireisl, Eduard
name: Kreml, Ondřej
name: Nečasová, Šárka
name: Neustupa, Jiří
name: Stebel, Jan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We consider the compressible (barotropic) Navier-Stokes system on time-dependent domains, supplemented with slip boundary conditions. Our approach is based on penalization of the boundary behaviour, viscosity, and the pressure in the weak formulation. Global-in-time weak solutions are obtained.
“Baby, you can drive my car” – Means of transportation in a long dream series
Creators: name: Schredl, Michael
Publisher: name: International Journal of Dream Research
Year: 2020

description: Using transportation means like cars, public transportation is an important part of modern life style. Thus, it is not unexpected that transportation also plays a significant role in dreams. In a long series (N = 11,463 dreams) of one dreamer (single-case study) about 16% of the dreams included some form of transportation. The dreamer who is driving cars very rarely, dreamed more often about being a co-driver than a driver – in contrast to persons who drive a car regularly, supporting the continuity hypothesis of dreaming. On the other hand, several dreams were “creative”, i.e., don’t reflect any actual waking-life experiences of the dreamer, for example, traveling in a spaceship or submarine. Car trouble dreams were frequent (40% of the car driving dreams) even though the dreamer never experienced car trouble in waking life, e.g., malfunctioning brakes. This supports the idea of Patricia Garfield that this dream type is metaphorically linked to feelings of not being in control in waking life. Very interesting topics for future research would be studying the relationship of “creative” dreams, i.e., dreams that did not reflect directly the actual waking-life experience of the dreamer, and his or her waking life and the possible metaphoric link between car trouble dreams and waking-life stress.
description: International Journal of Dream Research, Vol 13, No 1 (April 2020)
Holographic open quantum systems: Toy models and analytic properties of thermal correlators
Creators: name: Loganayagam, R.
name: Rangamani, Mukund
name: Virrueta, Julio
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a unified picture of open quantum systems, the theory of a system probing a noisy thermal environment, distilling lessons learnt from previous holographic analyses. Our treatment is applicable both when the system is coupled to short-lived (Markovian), and long-lived (non-Markovian) environmental degrees of freedom. The thermal environment is modeled using an asymptotically AdS black hole, and the systems of interest are simple probe field theories. The effective stochastic dynamics of the system is governed by real-time thermal correlators, which we compute using the gravitational Schwinger-Keldysh (grSK) geometry. We describe the structure of arbitrary tree-level contact and exchange Witten diagrams in the grSK geometry. In particular, we argue, that all such diagrams reduce to integrals supported on a single copy of the exterior of the black hole. The integrand is obtained as a multiple discontinuity of a function comprising ingoing boundary-bulk propagators, monodromy functions which appear as radial Boltzmann weights, and vertex factors. These results allow us to deduce the analytic structure of real-time thermal n-point functions in holographic CFTs. We illustrate the general statements by a two-dimensional toy model, dual to fields in the BTZ background, which we argue captures many of the essential features of generic open holographic QFTs.
description: 47 pages. v2: minor improvements, published version
Supporting Information for New early Neoproterozoic paleomagnetic constraints of the northwestern China blocks on the periphery of Rodinia
Creators: name: Xu, Yan
Publisher: name: figshare
Year: 2022
Subjects: Geophysics not elsewhere classified

description: This supporting information contains 4 Figures showing uncorrelated relation between whole rock major and trace elements and loss on ignition (Figure S1), detailed demagnetization behaviors of dikes (Figure S2), and mean directions of the soft component isolated from dikes (Figure S3) and host rocks (Figures S4), and 4 tables including baddeleyite SHRIMP U-Pb data (Table S1), alternating field demagnetization results from mafic dikes (Table S2), major and trace elements compositions (Table S3) and the Euler rotation parameters for our paleogeographic reconstructions (Table S4).
The construction and analysis of dream metaphors from the standpoint of Co-Creative Dream Theory
Creators: name: Sparrow, Gregory Scott
Publisher: name: International Journal of Dream Research
Year: 2020

description: Co-creative dream theory posits that the dream is co-determined through the reciprocal interplay between the witnessing dream ego and the emergent content. Consequently, the resulting dream can be seen as one of many contingent outcomes based on the dreamer’s range of response through the course of the dream, as well as the broad constraints of underlying domains that account for the nature and thrust of the emergent content. From this relational view of the dream, the visual imagery is not the content itself, but rather the “mutable interface” (Sparrow, 2013) between the dream ego and the emergent content. The purpose of this paper is to consider how the Co-creative Paradigm (CCP) builds on contributions by Jung (2014), Ullman (1969), Lakoff (1993), Lakoff & Johnson (1980), and Rossi (1972), in particular, to construct a view of metaphor formation in dreams. By viewing dream content as representing broad domains of human experience rendered as specific metaphoric imagery during the dream encounter itself, this approach can discern where the dream ego stands in relationship to the developmental tasks associated with these emergent domains. Finally, I will introduce a generic approach to co-creative dreamwork that includes several operations that may facilitate effective dreamwork practice. The hypothesis presented in this paper is that this novel view of metaphoric imagery construction, based on the Co-Creative Paradigm, opens up new questions, and fosters insights heretofore unavailable from the standpoint of traditional content-oriented dream analysis.
description: International Journal of Dream Research, Vol 13, No 1 (April 2020)
Comment on "Design of acoustic devices with isotropic material via conformal transformation" [Appl. Phys. Lett. 97, 044101 (2010)]
Creators: name: Norris, Andrew N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The paper presents incorrect formulas for the density and bulk modulus under a conformal transformation of coordinates. The fault lies with an improper assumption of constant acoustic impedance.
description: 1 page
Enhanced eigenvector sensitivity and algebraic classification of sublattice-symmetric exceptional points
Creators: name: Yang, Kang
name: Mandal, Ipsita
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Exceptional points (EPs) are degeneracy of non-Hermitian Hamiltonians, at which the eigenvalues, along with their eigenvectors, coalesce. Their orders are given by the Jordan decomposition. Here, we focus on higher-order EPs arising in fermionic systems with a sublattice symmetry, which restricts the eigenvalues of the Hamitlonian to appear in pairs of $\lbrace E, -E\rbrace $. Thus, a naive prediction might lead to only even-order EPs at zero energy. However, we show that odd-order EPs can exist and exhibit enhanced sensitivity in the behaviour of eigenvector-coalescence in their neighbourhood, depending on how we approach the degenerate point. The odd-order EPs can be understood as a mixture of higher- and lower-valued even-order EPs. Such an anomalous behaviour is related to the irregular topology of the EPs as the subspace of the Hamiltonians in question, which is a unique feature of the Jordan blocks. The enhanced eigenvector sensitivity can be described by observing how the quantum distance to the target eigenvector converges to zero. In order to capture the eigenvector-coalescence, we provide an algebraic method to describe the conditions for the existence of these EPs. This complements previous studies based on resultants and discriminants, and unveils heretofore unexplored structures of higher-order exceptional degeneracy.
description: published version
Die nächste Pandemie kommt bestimmt
Creators: name: Schuldt, Karsten
Publisher: name: Informationspraxis
Year: 2020

description: Zusammenfassung Offenbar waren Öffentliche Bibliotheken im DACH-Raum nicht auf eine Katastrophen wie die COVID-19 Pandemie vorbereitet. Zu vermuten ist, dass dies auch für andere mögliche Katastrophen gelten wird. Dabei sollte eine Vorbereitung auf solche Ereignisse zum professionellen bibliothekarischen Handeln gehören. Zumeist auf der Erfahrung anderer Katastrophen basierend existiert eine ganze Breite von Literatur zu Möglichkeiten solcher Planung, die auch für Öffentliche Bibliotheken relevant ist. Dieser Artikel gibt eine Übersicht zu dieser Literatur der letzten 20 Jahre. Schlüsselwörter Katastrophen, Krisen, Katastrophenplan, Öffentliche Bibliothek, Literaturbericht Abstract Apparently public libraries in the German speaking countries were not prepared for a catastrophe like the COVID-19 pandemic. It can be assumed that this will also apply to other possible disasters. Preparation for such events should be part of professional work of libraries. Mostly based on the experience of other catastrophes, there is a wide range of literature on the possibilities of such planning, which could also be utilised by public libraries. This article provides an overview of this literature over the last 20 years. Keywords Disaster, Crisis, Disaster Planning, Public Library, Literature Review
description: Informationspraxis, Bd. 6 Nr. 1 (2020)
Optimizing One Fair Document Exchange Protocol
Creators: name: Alaraj, Abdullah M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: This paper presents an efficient fair document exchange protocol. The exchange of the documents will be between two parties. The protocol is based on the verifiable and recoverable encryption of a document's key. This verifiable and recoverable encryption of the document's key will allow one party to verify the encrypted key. It will also ensure this party that the Semi Trusted Third Party will be able to recover the key if the other party misbehaves. The protocol also incorporates the concept of enforcing the honesty of one party. The proposed protocol consists of only three messages and is more efficient than related protocols.
description: 12 pages, 2 figures, Journal article
Fiber-coupled Diamond Magnetometry with an Unshielded 30 pT/$\sqrt{\textrm{Hz}}$ Sensitivity
Creators: name: Graham, S. M.
name: Rahman, A. T. M. A.
name: Munn, L.
name: Patel, R. L.
name: Newman, A. J.
name: Stephen, C. J.
name: Colston, G.
name: Nikitin, A.
name: Edmonds, A. M.
name: Twitchen, D. J.
name: Markham, M. L.
name: Morley, G. W.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Instrumentation and Detectors (physics.ins-det)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Ensembles of nitrogen vacancy centres (NVCs) in diamond can be employed for sensitive magnetometry. In this work we present a fiber-coupled NVC magnetometer with an unshielded sensitivity of (30 $\pm$ 10) pT/$\sqrt{\textrm{Hz}}$ in a (10 - 500)-Hz frequency range. This sensitivity is enabled by a relatively high green-to-red photon conversion efficiency, the use of a [100] bias field alignment, microwave and lock-in amplifier (LIA) parameter optimisation, as well as a balanced hyperfine excitation scheme. Furthermore, a silicon carbide (SiC) heat spreader is used for microwave delivery, alongside low-strain $^{12}\textrm{C}$ diamonds, one of which is placed in a second magnetically insensitive fluorescence collecting sensor head for common-mode noise cancellation. The magnetometer is capable of detecting signals from sources such as a vacuum pump up to 2 m away, with some orientation dependence but no complete dead zones, demonstrating its potential for use in remote sensing applications.
description: 21 pages, 19 figures, correction to data analysis
Shear thickening of cornstarch suspensions
Creators: name: Fall, Abdoulaye
name: Bertrand, François
name: Ovarlez, Guillaume
name: Bonn, Daniel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study the rheology of cornstarch suspensions, a non-Brownian particle system that exhibits discontinuous shear thickening. Using magnetic resonance imaging (MRI), the local properties of the flow are obtained by the determination of local velocity profiles and concentrations in a Couette cell. For low rotational rates, we observe shear localization characteristic of yield stress fluids. When the overall shear rate is increased, the width of the sheared region increases. The discontinuous shear thickening is found to set in at the end of this shear localization regime when all of the fluid is sheared: the existence of a nonflowing region, thus, seems to prevent or delay shear thickening. Macroscopic observations using different measurement geometries show that the smaller the gap of the shear cell, the lower the shear rate at which shear thickening sets in. We, thus, propose that the discontinuous shear thickening of cornstarch suspensions is a consequence of dilatancy: the system under flow attempts to dilate but instead undergoes a jamming transition, because it is confined. This proposition is confirmed by an independent measurement of the dilation of the suspension as a function of the shear rate. It is also explains the MRI observations: when flow is localized, the nonflowing region plays the role of a "dilatancy reservoir" which allows the material to be sheared without jamming.
description: arXiv admin note: text overlap with arXiv:0709.3171, and with arXiv:1101.2309, arXiv:cond-mat/0406422 by other authors
Saturation of the magnetorotational instability and the origin of magnetically elevated accretion discs
Creators: name: Begelman, Mitchell C.
name: Armitage, Philip J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We propose that the strength of angular momentum transport in accretion discs threaded by net vertical magnetic field is determined by a self-regulation mechanism: the magnetorotational instability (MRI) grows until its own turbulent resistivity damps the fastest growing mode on the scale of the disc thickness. Given weak assumptions as to the structure of MRI-derived turbulence, supported by prior simulation evidence, the proposed mechanism reproduces the known scaling of the viscous $α$-parameter, $α\propto β_z^{-1/2}$. Here, $β_z = 8πp_g/B_{z0}^2$ is the initial plasma $β$-parameter on the disc midplane, $B_{z0}$ is the net field, and $p_g $ is the midplane gas pressure. We generalize the argument to discs with strong suprathermal toroidal magnetic fields, where the MRI growth rate is modified from the weak-field limit. Additional sources of turbulence are required if such discs are to become magnetically elevated, with the increased scale heights near the midplane that are seen in simulations. We speculate that tearing modes, associated with current sheets broadened by the effective resistivity, are a possible source of enhanced turbulence in elevated discs.
description: 9 pages, 2 figures, to be published in Monthly Notices of the Royal Astronomical Society. Replaces arXiv:2211.09261, eliminating section 2.2 and with moderate revisions and clarifications in sections 3.1, 3.3, 4.2 and 4.3
Inhalt
Creators: name: Redaktion, Die
Publisher: name: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
Year: 2020

description: Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege, Bd. 25 Nr. 6 (1972): Kunstchronik. Monatsschrift für Kunstwissenschaft, Museumswesen und Denkmalpflege
The Shi arrangement of the type $D_\ell$
Creators: name: Gao, Ruimei
name: Pei, Donghe
name: Terao, Hiroaki
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 32S22, 05E15

description: In this paper, we give a basis for the derivation module of the cone over the Shi arrangement of the type $D_\ell$ explicitly.