cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantum Hall Drag of Exciton Superfluid in Graphene
Creators: name: Liu, Xiaomeng
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Halperin, Bertrand I.
name: Kim, Philip
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Excitons are pairs of electrons and holes bound together by the Coulomb interaction. At low temperatures, excitons can form a Bose-Einstein condensate (BEC), enabling macroscopic phase coherence and superfluidity. An electronic double layer (EDL), in which two parallel conducting layers are separated by an insulator, is an ideal platform to realize a stable exciton BEC. In an EDL under strong magnetic fields, electron-like and hole-like quasi-particles from partially filled Landau levels (LLs) bind into excitons and condense. However, in semiconducting double quantum wells, this magnetic-field-induced exciton BEC has been observed only in sub-Kelvin temperatures due to the relatively strong dielectric screening and large separation of the EDL. Here we report exciton condensation in bilayer graphene EDL separated by a few atomic layers of hexagonal boron nitride (hBN). Driving current in one graphene layer generates a quantized Hall voltage in the other layer, signifying coherent superfluid exciton transport. Owing to the strong Coulomb coupling across the atomically thin dielectric, we find that quantum Hall drag in graphene appears at a temperature an order of magnitude higher than previously observed in GaAs EDL. The wide-range tunability of densities and displacement fields enables exploration of a rich phase diagram of BEC across Landau levels with different filling factors and internal quantum degrees of freedom. The observed robust exciton superfluidity opens up opportunities to investigate various quantum phases of the exciton BEC and design novel electronic devices based on dissipationless transport.
description: 12 pages, 3 figures and supplementary information
title: A Comparative Analysis of Prospective Nursing Patient Classification and Retrospective Nursing Patient Classification
Creators: name: Hlusko, Dana Larmore
Publisher: name: Old Dominion University Libraries
Year: 1994

description: Nursing patient classification systems have been in use in some form since Florence Nightingale first arranged her patients in wards (Giovanetti, 1978). Prospective classification systems which have been implemented in hospitals now generate billing information, staff budgets and long-range financial forecasts (Giovanetti, 1978; Alward, 1983; Edwardson and Giovanetti, 1987). Quantitative analysis using at-test indicated a significant difference in mean acuity scores in the prospective and retrospective data which pointed to a retrospective system as being more appropriate for billing, budgeting and finance decisions. Spearman's correlation analysis did not demonstrate a strong correlation between any indicators or with total acuity. Several variables exhibited significant differences in two of the three study units. Regression analysis was inconclusive in identifying a common group of indicators which were highly predictive in all study units.
Postkartenvorlage 3-2-1 Backup-Regel
Creators: name: Schreyer, Lioba
Publisher: name: Zenodo
Year: 2023
Subjects: FDM
Forschungsdatenmanagement
Forschungsdaten
Awarenessmaterialien
Backup-Regel

description: Drei Kopien der Datei erstellen, auf zwei Speichermedien ablegen, eine Kopie dezentral speichern - die 3-2-1 Backup-Regel ist in FDM-Kreisen bereits bekannt. Um sie auch darüber hinaus zu verbreiten, kann die Postkartenvorlage erstellt von der Landesinitiative fdm.nrw nachgenutzt werden. Die Vorlage wurde mit Powerpoint erstellt, sodass sie einfach und ohne Erfahrungen in der Mediengestaltung verändert und nachgenutzt werden kann. Nutzer*innen können ihr eigenes Logo, beispielsweise an der vorgeschlagenen Stelle, einfügen, die Farben weitgehen ändern oder Symbole austauschen. Dann kann die Vorlage zum Druck von Postkarten genutzt und mit einem USB-Stick (für Schritt 2 der Regel) an Forschende verteilt werden. So wird nicht nur für gutes FDM sensibilisiert, sondern anwendbares Wissen ansprechend, kurz und knapp verbreitet.
Statistical properties of gravity-driven granular discharge flow under the influence of an obstacle
Creators: name: Endo, K.
name: Katsuragi, H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Two-dimensional granular discharge flow driven by gravity under the influence of an obstacle is experimentally investigated. A horizontal exit of width $W$ is opened at the bottom of vertical Hele-Shaw cell filled with stainless-steel particles to start the discharge flow. In this experiment, a circular obstacle is placed in front of the exit. Thus, the distance between the exit and obstacle $L$ is also an important parameter. During the discharge, granular-flow state is acquired by a high-speed camera. The bulk discharge-flow rate is also measured by load cell sensors. The obtained high-speed-image data are analyzed to clarify the particle-level granular-flow dynamics. Using the measured data, we find that the obstacle above the exit affects the granular-flow field. Specifically, the existence of obstacle results in large horizontal granular temperature and small packing fraction. This tendency becomes significant when $L$ is smaller than approximately 6$D_g$ when $W \simeq 4 D_g$, where $D_g$ is diameter of particles.
description: 4 pages, 5 figures
Evolving hypersurfaces by their inverse null mean curvature
Creators: name: Moore, Kristen
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53

description: We introduce a new geometric evolution equation for hypersurfaces in asymptotically flat spacetime initial data sets, that unites the theory of marginally outer trapped surfaces (MOTS) with the study of inverse mean curvature flow in asymptotically flat Riemannian manifolds. A theory of weak solutions is developed using level-set methods and an appropriate variational principle. This new flow has a natural application as a variational-type approach to constructing MOTS, and this work also gives new insights into the theory of weak solutions of inverse mean curvature flow.
Differences in ballistic findings between autopsy and post-mortem computed tomography in the head and neck region of gunshot victims: a comprehensive synthesis for forensic decision-making
Creators: name: Vicentin-Junior, Carlos Antonio
name: Vieira, Raíssa Bastos
name: Damascena, Nicole Prata
name: Silva, Melina Calmon
name: Santiago, Bianca Marques
name: Cunha, Eugénia
name: Issa, João Paulo Mardegan
name: Martins-Filho, Paulo Ricardo
name: Machado, Carlos Eduardo Palhares
Publisher: name: IfADo - Leibniz Research Centre for Working Environment and Human Factors, Dortmund
Year: 2023
Subjects: autopsy
computed tomography
forensic ballistics
firearms
head

description: EXCLI Journal; 22:Doc600; ISSN 1611-2156
Coordinated Optimization at a Hydro Generating Plant by Software Agents
Creators: name: Foreman, James Christopher
name: Ragade, Rammohan K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The architecture is developed for incorporating a software agent into the existing control system of a river-based hydro generating plant. The software agent will utilize a rule-based system for ease of integration. Optimization for increased power production is presented, initially for a single generating unit. An enhancement to facilitate the constraints of river level and flow by an external user as well as the goals of corporate dispatching is then developed through the existing SCADA system. Finally, expansion to coordinate multiple hydro units at a single location is presented.
Rotational diffusion of particles in turbulence
Creators: name: Meyer, Colin R.
name: Variano, Evan A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Through laboratory measurements, we compare the rotation of spherical and ellipsoidal particles in homogeneous, isotropic turbulence. We find that the particles' angular velocity statistics are well described by an Ornstein-Uhlenbeck (OU) process. This theoretical model predicts that the Lagrangian autocovariance of particles' angular velocity will decay exponentially. We measure the autocovariance using stereoscopic particle image velocimetry (SPIV) applied to particles whose size is within the inertial subrange of the ambient turbulence. The SPIV resolves the motion of points interior to the particles, from which we calculate the solid body rotation of the particles. This provides us with the angular velocity time series for individual particles. Through ensemble statistics, we determine the autocovariance of angular velocity and confirm that it matches the form predicted by an OU process. We can further use the autocovariance curve to quantify the turbulent rotational diffusivity.
Non-negatively constrained least squares and parameter choice by the residual periodogram for the inversion of electrochemical impedance spectroscopy
Creators: name: Hansen, Jakob
name: Hogue, Jarom
name: Sander, Grant
name: Renaut, Rosemary
name: Popat, Sudeep
Publisher: name: arXiv
Year: 2013
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65F10, 45B05, 65R32

description: The inverse problem associated with electrochemical impedance spectroscopy requiring the solution of a Fredholm integral equation of the first kind is considered. If the underlying physical model is not clearly determined, the inverse problem needs to be solved using a regularized linear least squares problem that is obtained from the discretization of the integral equation. For this system, it is shown that the model error can be made negligible by a change of variables and by extending the effective range of quadrature. This change of variables serves as a right preconditioner that significantly improves the condition of the system. Still, to obtain feasible solutions the additional constraint of non-negativity is required. Simulations with artificial, but realistic, data demonstrate that the use of non-negatively constrained least squares with a smoothing norm provides higher quality solutions than those obtained without the non-negative constraint. Using higher-order smoothing norms also reduces the error in the solutions. The L-curve and residual periodogram parameter choice criteria, which are used for parameter choice with regularized linear least squares, are successfully adapted to be used for the non-negatively constrained Tikhonov least squares problem. Although these results have been verified within the context of the analysis of electrochemical impedance spectroscopy, there is no reason to suppose that they would not be relevant within the broader framework of solving Fredholm integral equations for other applications.
description: Supplementary materials contain extra figures and results
Low-damping sub-10-nm thin films of lutetium iron garnet grown by molecular-beam epitaxy
Creators: name: Jermain, C. L.
name: Paik, H.
name: Aradhya, S. V.
name: Buhrman, R. A.
name: Schlom, D. G.
name: Ralph, D. C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We analyze the structural and magnetic characteristics of (111)-oriented lutetium iron garnet (Lu$_3$Fe$_5$O$_{12}$) films grown by molecular-beam epitaxy, for films as thin as 2.8 nm. Thickness-dependent measurements of the in- and out-of-plane ferromagnetic resonance allow us to quantify the effects of two-magnon scattering, along with the surface anisotropy and the saturation magnetization. We achieve effective damping coefficients of $11.1(9) \times 10^{-4}$ for 5.3 nm films and $32(3) \times 10^{-4}$ for 2.8 nm films, among the lowest values reported to date for any insulating ferrimagnetic sample of comparable thickness.
description: 14 pages, 4 figures
Signature of enhanced spin-orbit interaction in the magnetoresistance of LaTiO$_3$/SrTiO$_3$ interfaces on $δ$-doping
Creators: name: Das, Shubhankar
name: Hossain, Z.
name: Budhani, R. C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present a study of modulation of spin-orbit interaction (SOI) at the interface of LaTiO$_3$/SrTiO$_3$ by $δ$-doping with an iso-structural ferromagnetic perovskite LaCoO$_3$. The sheet carrier density at the interface decreases exponentially with $δ$-doping thickness. We have explored that the spin-orbit scattering time ($τ_{so}$) can be decreased by nearly 3 orders of magnitude, whereas the inelastic scattering time ($τ_{i}$) remains almost constant with $δ$-doping thickness. We have also observed that the $τ_{i}$ varies almost inversely proportional to temperature and $τ_{so}$ remains insensitive to temperature, which suggest that the spin relaxation in these interfaces follows D'yakonov-Perel mechanism. The observed in-plane anisotropic magnetoresistance is attributed to the mixing of the spin up and spin down states of d-band at Fermi level due to SOI.
description: 8 pages, 7 figures
Automatic estimation of the regularization parameter in 2-D focusing gravity inversion: an application to the Safo manganese mine in northwest of Iran
Creators: name: Vatankhah, Saeed
name: Ardestani, Vahid E
name: Renaut, Rosemary A
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: We investigate the use of Tikhonov regularization with the minimum support stabilizer for underdetermined 2-D inversion of gravity data. This stabilizer produces models with non-smooth properties which is useful for identifying geologic structures with sharp boundaries. A very important aspect of using Tikhonov regularization is the choice of the regularization parameter that controls the trade off between the data fidelity and the stabilizing functional. The L-curve and generalized cross validation techniques, which only require the relative sizes of the uncertainties in the observations are considered. Both criteria are applied in an iterative process for which at each iteration a value for regularization parameter is estimated. Suitable values for the regularization parameter are successfully determined in both cases for synthetic but practically relevant examples. Whenever the geologic situation permits, it is easier and more efficient to model the subsurface with a 2-D algorithm, rather than to apply a full 3-D approach. Then, because the problem is not large it is appropriate to use the generalized singular value decomposition for solving the problem efficiently. The method is applied on a profile of gravity data acquired over the Safo mining camp in Maku-Iran, which is well known for manganese ores. The presented results demonstrate success in reconstructing the geometry and density distribution of the subsurface source.
Dynamo Sensitivity in Solar Analogs with 50 Years of Ca II H & K Activity
Creators: name: Egeland, Ricky
name: Soon, Willie
name: Baliunas, Sallie
name: Hall, Jeffrey C.
name: Pevtsov, Alexei A.
name: Henry, Gregory W.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The Sun has a steady 11-year cycle in magnetic activity most well-known by the rising and falling in the occurrence of dark sunspots on the solar disk in visible bandpasses. The 11-year cycle is also manifest in the variations of emission in the Ca II H & K line cores, due to non-thermal (i.e. magnetic) heating in the lower chromosphere. The large variation in Ca II H & K emission allows for study of the patterns of long-term variability in other stars thanks to synoptic monitoring with the Mount Wilson Observatory HK photometers (1966-2003) and Lowell Observatory Solar-Stellar Spectrograph (1994-present). Overlapping measurements for a set of 27 nearby solar-analog (spectral types G0-G5) stars were used to calibrate the two instruments and construct time series of magnetic activity up to 50 years in length. Precise properties of fundamental importance to the dynamo are available from Hipparcos, the Geneva-Copenhagen Survey, and CHARA interferometry. Using these long time series and measurements of fundamental properties, we do a comparative study of stellar "twins" to explore the sensitivity of the stellar dynamo to small changes to structure, rotation, and composition. We also compare this sample to the Sun and find hints that the regular periodic variability of the solar cycle may be rare among its nearest neighbors in parameter space.
description: 5 pages, 2 figures. To appear in the proceedings of "The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun" (ed. G. A. Feiden), Uppsala, Sweden, 06-10 June 2016
Applying the $χ^2$ Regularization Parameter Estimator by Downsampling Through Relations with The Singular Value Expansion
Creators: name: Renaut, Rosemary A.
name: Horst, Michael
name: Wang, Yang
name: Cochran, Douglas
name: Hansen, Jakob
Publisher: name: arXiv
Year: 2013
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65F10 45A05 65R32 65F22 45B05

description: The solution, $x$, of the linear system of equations $A x\approx b$ arising from the discretization of an ill-posed integral equation with a square integrable kernel $H(s,t)$ is considered. The Tikhonov regularized solution $ x(λ)$ is found as the minimizer of $J( x)=\{ \|A x - b\|_2^2 + λ^2 \|L x\|_2^2\}$. $ x(λ)$ depends on regularization parameter $λ$ that trades off the data fidelity, and on the smoothing norm determined by $L$. Here we consider the case where $L$ is diagonal and invertible, and employ the Galerkin method to provide the relationship between the singular value expansion and the singular value decomposition for square integrable kernels. The resulting approximation of the integral equation permits examination of the properties of the regularized solution $ x(λ)$ independent of the sample size of the data. We prove that estimation of the regularization parameter can be obtained by consistently down sampling the data and the system matrix, leading to solutions of coarse to fine grained resolution. Hence, the estimate of $λ$ for a large problem may be found by downsampling to a smaller problem, or to a set of smaller problems, effectively moving the costly estimate of the regularization parameter to the coarse representation of the problem. Moreover, the full singular value decomposition for the fine scale system is replaced by a number of dominant terms which is determined from the coarse resolution system, again reducing the computational cost. Numerical results illustrate the theory and demonstrate the practicality of the approach for regularization parameter estimation using generalized cross validation, unbiased predictive risk estimation and the discrepancy principle applied for both the system of equations, and the augmented system of equations.
Subsídio para a bibliografia de Timor Loro-sa’e: uma listagem cronológica de livros, revistas, ensaios, documentos e artigos desde 1515 a 2000
Creators: name: Belo, Carlos Filipe Ximenes
Publisher: name: Povos e Culturas
Year: 2001

description: Povos e Culturas, No 7 (2001): Timor hoje
Regularization Parameter Estimation for Underdetermined problems by the $χ^2$ principle with application to $2D$ focusing gravity inversion
Creators: name: Vatankhah, Saeed
name: Renaut, Rosemary A
name: Ardestani, Vahid E
Publisher: name: arXiv
Year: 2014
Subjects: subject: Numerical Analysis (math.NA)
subject: Methodology (stat.ME)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 65F22, 65F10, 65R32

description: The $χ^2$-principle generalizes the Morozov discrepancy principle (MDP) to the augmented residual of the Tikhonov regularized least squares problem. Weighting of the data fidelity by a known Gaussian noise distribution on the measured data, when the regularization term is weighted by unknown inverse covariance information on the model parameters, the minimum of the Tikhonov functional is a random variable following a $χ^2$-distribution with $m+p-n$ degrees of freedom, model matrix $G:$ $m \times n$ and regularizer $L:$ $p\times n$. It is proved that the result holds also for $m
Catálogo da série Timor do Conselho Ultramarino
Creators: name: Abrantes, Maria Luisa
name: Martinheira, José Sintra
name: Infante, Miguel Rui
name: Caria, Maria Antónia Alves
name: Infante, Miguel Rui
Publisher: name: Povos e Culturas
Year: 2001

description: Povos e Culturas, No 7 (2001): Timor hoje
Iterative properties of birational rowmotion
Creators: name: Grinberg, Darij
name: Roby, Tom
Publisher: name: arXiv
Year: 2014
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 06A07, 05E99

description: We study a birational map associated to any finite poset P. This map is a far-reaching generalization (found by Einstein and Propp) of classical rowmotion, which is a certain permutation of the set of order ideals of P. Classical rowmotion has been studied by various authors (Fon-der-Flaass, Cameron, Brouwer, Schrijver, Striker, Williams and many more) under different guises (Striker-Williams promotion and Panyushev complementation are two examples of maps equivalent to it). In contrast, birational rowmotion is new and has yet to reveal several of its mysteries. In this paper, we prove that birational rowmotion has order p+q on the (p, q)-rectangle poset (i.e., on the product of a p-element chain with a q-element chain); we furthermore compute its orders on some triangle-shaped posets and on a class of posets which we call "skeletal" (this class includes all graded forests). In all cases mentioned, birational rowmotion turns out to have a finite (and explicitly computable) order, a property it does not exhibit for general finite posets (unlike classical rowmotion, which is a permutation of a finite set). Our proof in the case of the rectangle poset uses an idea introduced by Volkov (arXiv:hep-th/0606094) to prove the AA case of the Zamolodchikov periodicity conjecture; in fact, the finite order of birational rowmotion on many posets can be considered an analogue to Zamolodchikov periodicity. We comment on suspected, but so far enigmatic, connections to the theory of root posets. We also make a digression to study classical rowmotion on skeletal posets, since this case has seemingly been overlooked so far.
description: 139 pages. v7 corrects and proves Proposition 10.34 and corrects the proof of Proposition 10.31. Even more details in an ancillary file. The published version is shorter, differently organized and spread over two EJC (Electronic Journal of Combinatorics) papers. Comments are still welcome!
title: Human Need Fulfillment Alteration in the Client with Uterine Cancer: The Registered Nurses' Perception Versus the Clients' Perception
Creators: name: Lilley, Linda Lane
Publisher: name: Old Dominion University Libraries
Year: 1984

description: This study was a comparison of the similarities and differences between the registered nurses' perception and clients' perception of human need fulfillment alterations in the client with uterine cancer. The effect of level of educational preparation and number of years work experience on the nurses' perception was also analyzed. The participants were 15 registered nurses and 15 clients who had uterine cancer and were admitted to two acute care hospitals in Tidewater. Registered nurses were asked to complete the tool entitled Human Needs Assessment Scale and rate the 35 human needs in relation to the perceived importance for the client. The client, for whom the nurse was providing care, rated the 35 human needs in relation to their perceived importance for them. There were no significant differences in the nurses' and clients' perception or was correlation found between the nurses' perception and level of educational preparation and years work experience.
Application of the $χ^2$ principle and unbiased predictive risk estimator for determining the regularization parameter in 3D focusing gravity inversion
Creators: name: Vatankhah, Saeed
name: Ardestani, Vahid E.
name: Renaut, Rosemary A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65R32, 65F22

description: The $χ^2$ principle and the unbiased predictive risk estimator are used to determine optimal regularization parameters in the context of 3D focusing gravity inversion with the minimum support stabilizer. At each iteration of the focusing inversion the minimum support stabilizer is determined and then the fidelity term is updated using the standard form transformation. Solution of the resulting Tikhonov functional is found efficiently using the singular value decomposition of the transformed model matrix, which also provides for efficient determination of the updated regularization parameter each step. Experimental 3D simulations using synthetic data of a dipping dike and a cube anomaly demonstrate that both parameter estimation techniques outperform the Morozov discrepancy principle for determining the regularization parameter. Smaller relative errors of the reconstructed models are obtained with fewer iterations. Data acquired over the Gotvand dam site in the south-west of Iran are used to validate use of the methods for inversion of practical data and provide good estimates of anomalous structures within the subsurface.
New Software Metrics for Evaluation and Comparison of Advanced Power Management Systems
Creators: name: Foreman, James Christopher
name: Ragade, Rammohan K.
name: Graham, James H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: A set of software metrics for the evaluation of power management systems (PMSs) is presented. Such systems for managing power need to be autonomous, scalable, low in complexity, and comprised of portable algorithms in order to be well applied across the varying implementations that utilize power systems. Although similar metrics exist for software in general, their definitions do not readily lend themselves to the unique characteristics of power management systems or systems of similar architecture.
On rectangular HOMFLY for twist knots
Creators: name: Kononov, Ya.
name: Morozov, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Geometric Topology (math.GT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: As a new step in the study of rectangularly-colored knot polynomials, we reformulate the prescription of arXiv:1606.06015 for twist knots in the double-column representations $R=[rr]$ in terms of skew Schur polynomials. These, however, are mysteriously shifted from the standard topological locus, what makes further generalization to arbitrary $R=[r^s]$ not quite straightforward.
description: 6 pages
On $(χ,b)$-factors of Cuspidal Automorphic Representations of Unitary Groups I
Creators: name: Jiang, Dihua
name: Wu, Chenyan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11F27, 11F67, 11F70

description: Following the idea of [GJS09] for orthogonal groups, we introduce a new family of period integrals for cuspidal automorphic representations $σ$ of unitary groups and investigate their relation with the occurrence of a simple global Arthur parameter $(χ,b)$ in the global Arthur parameter $ψ_σ$ associated to $σ$, by the endoscopic classification of Arthur ([Art13], [Mok13], [KMSW14]). The argument uses the theory of theta correspondence. This can be viewed as a part of the $(χ,b)$-theory outlined in [Jia14] and can be regarded as a refinement of the theory of theta correspondences and poles of certain $L$-functions, which was outlined in [Ral91].
Einstein's Approach to Statistical Mechanics: The 1902-04 Papers
Creators: name: Peliti, Luca
name: Rechtman, Raúl
Publisher: name: arXiv
Year: 2016
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Physical sciences

description: We summarize the papers published by Einstein in the Annalen der Physik in the years 1902-04 on the derivation of the properties of thermal equilibrium on the basis of the mechanical equations of motion and of the calculus of probabilities. We point out the line of thought that led Einstein to an especially economical foundation of the discipline, and to focus on fluctuations of the energy as a possible tool for establishing the validity of this foundation. We also sketch a comparison of Einstein's approach with that of Gibbs, suggesting that although they obtained similar results, they had different motivations and interpreted them in very different ways.
description: 22 pages, submitted to JSP
Null mean curvature flow and outermost MOTS
Creators: name: Bourni, Theodora
name: Moore, Kristen
Publisher: name: arXiv
Year: 2015
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53

description: We study the evolution of hypersurfaces in spacetime initial data sets by their null mean curvature. A theory of weak solutions is developed using the level-set approach. Starting from an arbitrary mean convex, outer untapped hypersurface $\partialΩ_0$, we show that there exists a weak solution to the null mean curvature flow, given as a limit of approximate solutions that are defined using the $\varepsilon$-regularization method. We show that the approximate solutions blow up on the outermost MOTS and the weak solution converges (as boundaries of finite perimeter sets) to a generalized MOTS.
description: A mistake in the use of the L^1 norm of the mean curvature instead of the L^2 norm in proofs of Theorems 37 and 39 was corrected. The use of the L^2 norm is needed in the application of the varifold convergence
The 'New Normal' in Migration Management in Serbia in Times of the COVID-19 Crisis
Creators: name: Šantić, Danica
name: Todorović, Milica
name: Perišić, Natalija
Publisher: name: Zenodo
Year: 2021

description: The COVID-19 pandemic has had severe consequences for the large-scale movement of populations within and across borders. Moreover, the crisis has had serious impacts on origin, transit and destination countries, as well as on migrant workers and their families. This paper aims to enhance the understanding of migration contexts in times of crises, as well as migrant-specific vulnerabilities, including the characteristics of stranded migrants in Serbia. Two phenomena have interacted to influence the shape and intensity of mobility in the country during the pandemic: that of citizens returning from abroad in the wake of the economic downturn and changing labour markets, and that of irregular migrants and asylum seekers stranded in transit along the Western Balkan Migration Route. An emphasis is placed on the challenges faced by migrants, as well as those faced by the country itself in terms of migration governance and management in times of crisis, questioning the existence of barriers to access to support. Despite the fact that these different groups of migrants will experience crises differently, it is important to explore the capacity of the country to assist them, both while in their country of origin and while in transit.
description: This is an original manuscript of an article published by Taylor & Francis in Journal of Balkan and Near Eastern Studies on December 20th, 2021 available at: https://doi.org/10.1080/19448953.2021.2015659
Microgrid Reference Methodology for Understanding Utility and Customer Interactions in Microgrid Projects
Creators: name: Pacheco, Franklin E.
name: Foreman, James Christopher
Publisher: name: arXiv
Year: 2016
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The purpose of this paper is to introduce a holistic and systematic approach, based in key concepts of systems thinking, systems of systems and management science; to completely represent, model and analyze microgrid systems. In this paper we propose a Microgrid Reference Methodology (MRM) that guides the cooperation and mutual benefits between electric utilities and industrial customers for microgrid projects. We sketch a four-level socio-technical system in which the δ (business) level is added to the other three levels that are traditionally analyzed in microgrid design and planning. This MRM clearly specifies the steps and processes necessary for determining actors in the system, their interrelations, interests, goals and undesired effects. Finally, the MRM makes possible the evaluation of the impact of different alternatives on the objectives of both parties through the determination of criteria and factors. These factors can be influenced by the electric utility and customer; or they can be external, but still influenced by other actors such as regulators and government, to incentivize the implementation of microgrid projects.
Virtual Abelian varieties of $\mathrm{GL}_2$-type
Creators: name: Wu, Chenyan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 11G10, 14G35

description: This paper studies a class of Abelian varieties that are of $\GL_2$-type and with isogenous classes defined over a number field $k$. We treat the cases when their endomorphism algebras are either (1) a totally real field $K$ or (2) a totally indefinite quaternion algebra over a totally real field $K$. Among the isogenous class of such an Abelian variety, we identify one whose Galois conjugates can be described in terms of actions of Atkin-Lehner operators and the class group of $K$. Thus we deduce that such Abelian varieties are parametrised by finite quotients of certain PEL Shimura varieties. These new families of moduli spaces are further analysed when they are of dimension $2$. We provide explicit numerical bounds for when they are surfaces of general type. In addition, for two particular examples, we show that they are both rational surfaces by computing the coordinates of inequivalent elliptic points and studying the intersections of Hirzebruch cycles with exceptional divisors.
Oiconomy Pricing - Real price of a stone kitchen countertop (pilot 2)
Creators: name: van den Beucken, Niels
name: Liao, Wei-Ying
name: Croes, Pim R.
name: Vermeulen, Walter J.V.
name: Walker, Anna
Publisher: name: Zenodo
Year: 2023
Subjects: Full Cost Accounting
Sustainability Assessment
Oiconomy Pricing
Sustainability
LCA
sLCA

description: Arte is a kitchen countertop manufacturer from the Netherlands. They provide high-quality products made from natural stone, composite, ceramics and Dekton to local customers and over 200 stores. Their production facility in Helmond processes materials according to tailor-made designs. Arte has been devoted to projects that create positive impacts across the supply chain. In this case study, complete specifications within the chosen product line are examined to select a representative functional unit, compared to the first pilot study published in 2022
The insight into the dark side. I. The pitfalls of the dark halo parameters estimation
Creators: name: Saburova, Anna
name: Kasparova, Anastasia
name: Katkov, Ivan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We examined the reliability of estimates of pseudoisothermal, Burkert and NFW dark halo parameters for the methods based on the mass-modelling of the rotation curves.To do it we constructed the $χ^2$ maps for the grid of the dark matter halo parameters for a sample of 14 disc galaxies with high quality rotation curves from THINGS. We considered two variants of models in which: a) the mass-to-light ratios of disc and bulge were taken as free parameters, b) the mass-to-light ratios were fixed in a narrow range according to the models of stellar populations. To reproduce the possible observational features of the real galaxies we made tests showing that the parameters of the three halo types change critically in the cases of a lack of kinematic data in the central or peripheral areas and for different spatial resolutions. We showed that due to the degeneracy between the central densities and the radial scales of the dark haloes there are considerable uncertainties of their concentrations estimates. Due to this reason it is also impossible to draw any firm conclusion about universality of the dark halo column density based on mass-modelling of even a high quality rotation curve. The problem is not solved by fixing the density of baryonic matter. In contrast, the estimates of dark halo mass within optical radius are much more reliable. We demonstrated that one can evaluate successfully the halo mass using the pure best-fitting method without any restrictions on the mass-to-light ratios.
description: 20 pages, 8 figures, accepted for publication in MNRAS
Periods and $(χ,b)$-factors of Cuspidal Automorphic Forms of Symplectic Groups
Creators: name: Jiang, Dihua
name: Wu, Chenyan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11F27, 11F67, 11F70

description: In this paper, we introduce a new family of period integrals attached to irreducible cuspidal automorphic representations $σ$ of symplectic groups $\mathrm{Sp}_{2n}(\mathbb{A})$, which detects the right-most pole of the $L$-function $L(s,σ\timesχ)$ for some character $χ$ of $F^\times\backslash\mathbb{A}^\times$ of order at most $2$, and hence the occurrence of a simple global Arthur parameter $(χ,b)$ in the global Arthur parameter $ψ$ attached to $σ$. We also give a characterisation of first occurrences of theta correspondence by (regularised) period integrals of residues of certain Eisenstein series.
description: Making the corrected/accepted version available
Hybrid and iteratively reweighted regularization by unbiased predictive risk and weighted GCV for projected systems
Creators: name: Renaut, Rosemary A.
name: Vatankhah, Saeed
name: Ardestani, Vahid E.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65F10, 65F22, 65R32

description: Tikhonov regularization for projected solutions of large-scale ill-posed problems is considered. The Golub-Kahan iterative bidiagonalization is used to project the problem onto a subspace and regularization then applied to find a subspace approximation to the full problem. Determination of the regularization parameter for the projected problem by unbiased predictive risk estimation, generalized cross validation and discrepancy principle techniques is investigated. It is shown that the regularized parameter obtained by the unbiased predictive risk estimator can provide a good estimate for that to be used for a full problem which is moderately to severely ill-posed. A similar analysis provides the weight parameter for the weighted generalized cross validation such that the approach is also useful in these cases, and also explains why the generalized cross validation without weighting is not always useful. All results are independent of whether systems are over or underdetermined. Numerical simulations for standard one dimensional test problems and two dimensional data, for both image restoration and tomographic image reconstruction, support the analysis and validate the techniques. The size of the projected problem is found using an extension of a noise revealing function for the projected problem Hn\u etynková, Ple\u singer, and Strako\u s, [\textit{BIT Numerical Mathematics} {\bf 49} (2009), 4 pp. 669-696.]. Furthermore, an iteratively reweighted regularization approach for edge preserving regularization is extended for projected systems, providing stabilization of the solutions of the projected systems and reducing dependence on the determination of the size of the projected subspace.
Probabilistic Cellular Automata for low temperature Ising model
Creators: name: Procacci, Aldo
name: Scoppola, Benedetto
name: Scoppola, Elisabetta
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 82C20, 82B20, 60J10

description: We construct a parallel stochastic dynamics with invariant measure converging to the Gibbs measure of the low temperature Ising model. The proof of such convergence requires a polymer expansion based on suitably defined Peierls-type contours.
Qualitative Daten nachnutzen - Status Quo, Herausforderungen und Perspektiven
Creators: name: Mozygemba, Kati
name: Gebel, Tobias
name: Ikiz-Akinci, Dilek
Publisher: name: Zenodo
Year: 2023
Subjects: QualidataNet
qualitative Daten
Archivierung
Data Sharing
Daten teilen
Sekundärnutzung qualitativer Daten
Verbund
Forschungsdatenzentrum
Archiv
Netzwerk

description: Nachdem in der qualitativen Forschung lange über die Frage diskutiert wurde, ob sich qualitative Daten und Forschungsmaterialien überhaupt nachnutzen lassen (paradigmatisch: Hirschauer 2014), stellen wir – vor allem bei jüngeren Forscherinnen und Forschern – ein deutlich gestiegenes Interesse an Fragen der Archivierung und Nachnutzung qualitativer Daten und Forschungsmaterialien fest. Dies findet seinen Niederschlag neben Beispielen für Sekundäranalysen auch in einer mittlerweile stark ausdifferenzierten Infrastruktur zur Archivierung und Bereitstellung qualitativer Daten. Dazu gehören etwa die vom Rat für Sozial- und Wirtschaftsdaten akkreditierten Forschungsdatenzentren (FDZ), die qualitative Forschungsdaten halten – darunter das FDZ des Deutschen Zentrums für Hochschul- und Wissenschaftsforschung (DZHW), das FDZ für Betriebs- und Organisationsdaten, das FDZ Qualiservice, das FDZ Bildung und das Archiv für Gesprochenes Deutsch, das FDZ aviDa sowie das FDZ eLabour. Diese FDZ entwickelten in Zusammenarbeit mit den wissenschaftlichen Communitys Prozesse, die eine Archivierung und Bereitstellung von Forschungsmaterialien im Einklang mit forschungsethischen, rechtlichen und fachlichen Standards und Praktiken ermöglichen. Zugleich bietet jedes FDZ Services, die sich in ihrer fachlichen, thematischen oder Datentyp-Spezifik unterscheiden. Mit dem Ziel Forschenden einen besseren Zugang zu Forschungsdaten und Unterstützung rund um das Teilen von qualitativen Daten zu ermöglichen, wird im Rahmen der Nationalen Forschungsdateninfrastruktur (NFDI) vom Konsortium für die Sozial-, Bildungs-, Verhaltens- und Wirtschaftswissenschaften (KonsortSWD) der Verbund QualidataNet aufgebaut. In QualidataNet arbeiten verschiedene FDZ, die qualitative Forschungsdaten halten, zusammen. Die Website mit dem Suchportal wird Mitte 2023 online gehen und einen „single point of entry“ zu Daten, zu Instrumenten für das Forschungsdatenmanagement qualitativer Daten und zu best practices der Datenaufbereitung für das Data Sharing bieten. Ziel ist es, Forschenden den Zugang zu und die Nachnutzung von qualitativen Forschungsdaten zu erleichtern. Dabei ist für die Zukunft besonders wichtig, wie wir sicherstellen, dass die Bedarfe qualitativ Forschender die Grundlage für weitere Entwicklungen bilden, was aus Forschendensicht wichtig und notwendig ist, wie Forschende in Prozesse einbezogen werden können und werden wollen und wo die Infrastrukturen auch auf den Diskurs in den wissenschaftlichen Communitys angewiesen sind. Wir möchten zum Austausch darüber einladen und und damit auch dazu, die Weiterentwicklung von KonsortSWD im Rahmen der NFDI mitzugestalten.
Global Continuous Optimization with Error Bound and Fast Convergence
Creators: name: Kawaguchi, Kenji
name: Maruyama, Yu
name: Zheng, Xiaoyu
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optimization and Control (math.OC)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: This paper considers global optimization with a black-box unknown objective function that can be non-convex and non-differentiable. Such a difficult optimization problem arises in many real-world applications, such as parameter tuning in machine learning, engineering design problem, and planning with a complex physics simulator. This paper proposes a new global optimization algorithm, called Locally Oriented Global Optimization (LOGO), to aim for both fast convergence in practice and finite-time error bound in theory. The advantage and usage of the new algorithm are illustrated via theoretical analysis and an experiment conducted with 11 benchmark test functions. Further, we modify the LOGO algorithm to specifically solve a planning problem via policy search with continuous state/action space and long time horizon while maintaining its finite-time error bound. We apply the proposed planning method to accident management of a nuclear power plant. The result of the application study demonstrates the practical utility of our method.
3-D Projected $ L_{1}$ inversion of gravity data
Creators: name: Vatankhah, Saeed
name: Renaut, Rosemary A.
name: Ardestani, Vahid. E.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences
subject: 65F10

description: Sparse inversion of gravity data based on $L_1$-norm regularization is discussed. An iteratively reweighted least squares algorithm is used to solve the problem. At each iteration the solution of a linear system of equations and the determination of a suitable regularization parameter are considered. The LSQR iteration is used to project the system of equations onto a smaller subspace that inherits the ill-conditioning of the full space problem. We show that the gravity kernel is only mildly to moderately ill-conditioned. Thus, while the dominant spectrum of the projected problem accurately approximates the dominant spectrum of the full space problem, the entire spectrum of the projected problem inherits the ill-conditioning of the full problem. Consequently, determining the regularization parameter based on the entire spectrum of the projected problem necessarily over compensates for the non-dominant portion of the spectrum and leads to inaccurate approximations for the full-space solution. In contrast, finding the regularization parameter using a truncated singular space of the projected operator is efficient and effective. Simulations for synthetic examples with noise demonstrate the approach using the method of unbiased predictive risk estimation for the truncated projected spectrum. The method is used on gravity data from the Mobrun ore body, northeast of Noranda, Quebec, Canada. The $3$-D reconstructed model is in agreement with known drill-hole information.
In vivo data on lactation transfer in one or more animal species (D3.5)
Creators: name: Ventrella, Domenico
Publisher: name: Zenodo
Year: 2022

description: The aim of task 3.3 of the ConcePTION project is to develop and characterise a relevant in vivo model for drug passage from maternal blood to human breast milk. In this report the research on a non-clinical trial with the porcine species are reported.