cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dielectric permittivity, conductivity and breakdown field of hexagonal boron nitride
Creators: name: Pierret, A.
name: Mele, D.
name: Graef, H.
name: Palomo, J.
name: Taniguchi, T.
name: Watanabe, K.
name: Li, Y.
name: Toury, B.
name: Journet, C.
name: Steyer, P.
name: Garnier, V.
name: Loiseau, A.
name: Berroir, J-M.
name: Bocquillon, E.
name: Fève, G.
name: Voisin, C.
name: Baudin, E.
name: Rosticher, M.
name: Plaçais, B.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In view of the extensive use of hexagonal boron nitride (hBN) in 2D material electronics, it becomes important to refine its dielectric characterization in terms of low-field permittivity and high-field strength and conductivity up to the breakdown voltage. The present study aims at filling this gap using DC and RF transport in two Au-hBN-Au capacitor series of variable thickness in the 10--100 nm range, made of large high-pressure, high-temperature (HPHT) crystals and a polymer derivative ceramics (PDC) crystals. We deduce an out-of-plane low field dielectric constant $ε_\parallel=3.4\pm0.2$ consistent with the theoretical prediction of Ohba et al., that narrows down the generally accepted window $ε_\parallel=3$--$4$. The DC-current leakage at high-field is found to obey the Frenkel-Pool law for thermally-activated trap-assisted electron transport with a dynamic dielectric constant $ε_\parallel\simeq3.1$ and a trap energy $Φ_B\simeq1.3\;\mathrm{eV}$, that is comparable with standard technologically relevant dielectrics.
description: 10 pages, 2 figures, AM version in Materials Research Express
Assessing the Quality of QM/MM Approaches to Describe Vacuo-to-water Solvatochromic Shifts
Creators: name: Nicoli, Luca
name: Giovannini, Tommaso
name: Cappelli, Chiara
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The performance of different Quantum Mechanics/Molecular Mechanics embedding models to compute vacuo-to-water solvatochromic shifts are investigated. In particular, both non-polarizable and polarizable approaches are analyzed and computed results as compared to reference experimental data. We show that none of the approaches outperforms the others and that errors strongly depend on the nature of the molecular transition. Thus, we prove that the best choice of embedding model highly depends on the molecular system, and that the use a specific approach as a black-box can lead to significant errors and sometimes totally wrong predictions.
description: 12 pages, 6 figures
Bisectors in the Heisenberg group I
Creators: name: Gou, Gaoshun
name: Jiang, Yueping
name: Platis, Ioannis D.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: Primary 51M10, 53A10, 53C17, 57M50

description: We show that metric bisectors with respect to the Korányi metric in the Heisenberg group are spinal spheres and vice versa. We also calculate explicitly their horizontal mean curvature.
description: 9 pages, 2 figures
title: "Statua di Atena", arte romana, inv. CCLXXXVI (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
Prozessentwicklung zur Integration von enzymatisch-katalysierten Reaktionen in die Reaktivrektifikation
Creators: name: Heils, Rene
Publisher: name: Dr. Hut
Year: 2018
Subjects: subject: Reaktivrektifikation
subject: Immobilisiertes Enzym
subject: Sol-Gel Beschichtung
subject: Katalytische Packungen
subject: Katalysatorwechsel
classificationCode: 620
subject: Ingenieurwissenschaften

description: Die Integration von Reaktion und Trennung in der Reaktivrektifikation ist eine etablierte Methode zur Prozessintensivierung. Aufgrund der thermischen Belastung ist die Verwendung von enzymatischen Katalysatoren in der Reaktivrektifikation weitgehend unerforscht. In dieser Arbeit wurden Methoden zur Immobilisierung und zum Austausch des Katalysators weiterentwickelt, um schließlich in experimentellen und simulationsbasierten Untersuchungen erstmals die Umsetzung von enzymspezifischen Reaktionen in der Reaktivrektifikation aufzuzeigen.
description: In reactive distillation processes, the integration of reaction and separation into one unit operation not only reduces equipment and operational costs but also enables enhanced conversion and selectivity. Due to increased thermal stresses, the application of enzymes in this process is hardly explored. In this thesis, methods for integration and exchange of immobilized enzymes were developed to demonstrate the feasibility of enzymes for the production of single enantiomers in reactive distillation processes.
Three-dimensional structure of a single colloidal crystal grain studied by coherent x-ray diffraction
Creators: name: Gulden, J.
name: Yefanov, O. M.
name: Mancuso, A. P.
name: Dronyak, R.
name: Singer, A.
name: Bernátová, V.
name: Burkhardt, A.
name: Polozhentsev, O.
name: Soldatov, A.
name: Sprung, M.
name: Vartanyants, I. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A coherent x-ray diffraction experiment was performed on an isolated colloidal crystal grain at the coherence beamline P10 at PETRA III. Using azimuthal rotation scans the three-dimensional (3D) scattered intensity in reciprocal space from the sample was measured. It includes several Bragg peaks as well as the coherent interference around these peaks. The analysis of the scattered intensity reveals the presence of a plane defect in a single grain of the colloidal sample. We confirm these findings by model simulations. In these simulations we also analyze the experimental conditions to phase 3D diffraction pattern from a single colloidal grain. This approach has the potential to produce a high resolution image of the sample revealing its inner structure, with possible structural defects.
description: 20 pages, 5 figures
Physical geometry of channel degradation
Creators: name: Huntsman, Steve
Publisher: name: arXiv
Year: 2022
Subjects: subject: Information Theory (cs.IT)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: E.4
subject: 94A15

description: We outline a geometrical correspondence between capacity and effective free energy minima of discrete memoryless channels. This correspondence informs the behavior of a timescale that is important in effective statistical physics.
Simulation of a particle domain in a continuum/fluctuating hydrodynamics reservoir
Creators: name: Gholami, Abbas
name: Klein, Rupert
name: Site, Luigi Delle
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In molecular simulation and fluid mechanics, the coupling of a particle domain with a continuum representation of its embedding environment is an ongoing challenge. In this work, we show a novel approach where the latest version of the adaptive resolution scheme (AdResS), with non-interacting tracers as particles reservoir, is combined with a fluctuating hydrodynamics (FHD) solver. The resulting algorithm, supported by a solid mathematical model, allows for a physically consistent exchange of matter and energy between the particle domain and its fluctuating continuum reservoir. Numerical tests are performed to show the validity of the algorithm. Differently from previous algorithms of the same kind, the current approach allows for simulations where, in addition to density fluctuations, also thermal fluctuations can be accounted for, thus large complex molecular systems, as for example hydrated biological membranes in a thermal field, can now be efficiently treated.
description: In press
Symmetry results for compactly supported steady solutions of the 2D Euler equations
Creators: name: Ruiz, David
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this paper we prove symmetry of compactly supported steady solutions of the 2D Euler equations. Assuming that $Ω= \{x \in \mathbb{R}^2:\ u(x) \neq 0\}$ is an annular domain, we prove that the streamlines of the flow are circular. We are also able to remove the topological condition on $Ω$ if we impose regularity and nondegeneracy assumptions on $u$ at $\partial Ω$. The proof uses that the corresponding stream function solves an elliptic semilinear problem $-Δϕ= f(ϕ)$ with $\nabla ϕ=0$ at the boundary. One of the main difficulties in our study is that $f$ is not Lipschitz continuous near the boundary values. However, $f(ϕ)$ vanishes at the boundary values and then we can apply a local symmetry result of F. Brock to conclude. In the case $\partial_ν u \neq 0$ at $\partial Ω$ this argument is not possible. In this case we are able to use the moving plane scheme to show symmetry, despite the possible lack of regularity of $f$. We think that such result is interesting in its own right and will be stated and proved also for higher dimensions. The proof requires the study of maximum principles, Hopf lemma and Serrin corner lemma for elliptic linear operators with singular coefficients.
description: 22 pages, 2 figures. Comments are welcome. In this new version some minor errors have been corrected. To appear in Archive for Rational Mechanics and Analysis
The Implicit Bias of Benign Overfitting
Creators: name: Shamir, Ohad
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: The phenomenon of benign overfitting, where a predictor perfectly fits noisy training data while attaining near-optimal expected loss, has received much attention in recent years, but still remains not fully understood beyond well-specified linear regression setups. In this paper, we provide several new results on when one can or cannot expect benign overfitting to occur, for both regression and classification tasks. We consider a prototypical and rather generic data model for benign overfitting of linear predictors, where an arbitrary input distribution of some fixed dimension $k$ is concatenated with a high-dimensional distribution. For linear regression which is not necessarily well-specified, we show that the minimum-norm interpolating predictor (that standard training methods converge to) is biased towards an inconsistent solution in general, hence benign overfitting will generally not occur. Moreover, we show how this can be extended beyond standard linear regression, by an argument proving how the existence of benign overfitting on some regression problems precludes its existence on other regression problems. We then turn to classification problems, and show that the situation there is much more favorable. Specifically, we prove that the max-margin predictor (to which standard training methods are known to converge in direction) is asymptotically biased towards minimizing a weighted \emph{squared hinge loss}. This allows us to reduce the question of benign overfitting in classification to the simpler question of whether this loss is a good surrogate for the misclassification error, and use it to show benign overfitting in some new settings.
description: Version published in the Journal of Machine Learning Research
Analysis of long-term acoustic datasets for baleen whales and beaked whales within the Mariana Islands Range Complex (MIRC) for 2010 to 2013.
Creators: name: Oleson, Erin M. (Erin Marie), 1977-
name: Baumann-Pickering, Simone
name: Širović, Ana
name: Merkens, Karlina P.
name: Munger, Lisa M.
name: Trickey, Jennifer S.
name: Fisher-Pool, Pollyanna
Publisher: name: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Pacific Islands Fisheries Science Center
Year: 2015
Subjects: subject: Cetacea--Seasonal distribution--Mariana Islands.

description: Cetacean distribution and abundance in the Mariana Archipelago was relatively unstudied until recently. Although there has been increasing effort to understand the occurrence of various cetacean species in both near shore and offshore waters, there is still relatively little known about their occurrence seasonally, or their prevalence relative to other regions. To better understand the seasonal distribution of cetaceans in the Marianas, the NOAA Pacific Islands Fisheries Science Center (PIFSC) deployed a long-term acoustic recorder in the region in 2010, expanded that effort to two sites in 2011, and has been monitoring both sites since that time.
A Unified Analysis of Variational Inequality Methods: Variance Reduction, Sampling, Quantization and Coordinate Descent
Creators: name: Beznosikov, Aleksandr
name: Gasnikov, Alexander
name: Zainulina, Karina
name: Maslovskiy, Alexander
name: Pasechnyuk, Dmitry
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: In this paper, we present a unified analysis of methods for such a wide class of problems as variational inequalities, which includes minimization problems and saddle point problems. We develop our analysis on the modified Extra-Gradient method (the classic algorithm for variational inequalities) and consider the strongly monotone and monotone cases, which corresponds to strongly-convex-strongly-concave and convex-concave saddle point problems. The theoretical analysis is based on parametric assumptions about Extra-Gradient iterations. Therefore, it can serve as a strong basis for combining the already existing type methods and also for creating new algorithms. In particular, to show this we develop new robust methods, which include methods with quantization, coordinate methods, distributed randomized local methods, and others. Most of these approaches have never been considered in the generality of variational inequalities and have previously been used only for minimization problems. The robustness of the new methods is also confirmed by numerical experiments with GANs.
description: in Russian, 57 pages, 3 figures, 1 table
Proof of the Riemann Hypothesis
Creators: name: Rajaram, Neshant
Publisher: name: Zenodo
Year: 2025
Subjects: Riemann Hypothesis, zeta function, number theory, analytic number theory

description: This paper  presents proof of the Riemann Hypothesis, which states that all nontrivial zeros of the Riemann zeta function have real parts equal to. The proof applies analytic number theory methods, combining the Argument Principle, strengthened zero-density estimates, and the explicit formula to confirm that all nontrivial zeros lie on the critical line.
Simulation of continuous dynamic recrystallization using a level-set method
Creators: name: Grand, Victor
name: Flipon, Baptiste
name: Gaillac, Alexis
name: Bernacki, Marc
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Dynamic recrystallization is one of the main phenomena responsible for microstructure evolutions during hot forming. Consequently, getting a better understanding of DRX mechanisms and being able to predict them is crucial. This paper proposes a full-field numerical framework to predict the evolution of subgrain structures upon grain growth, continuous dynamic and post-dynamic recrystallization. The microstructure representation into the numerical environment is presented. The developments made to improve substructure description are detailed extensively. Using these simulation tools, simulation of grain growth of a fully substructured microstructure are run. The influence of microstructure topology, of subgrain parameters and of some remaining stored energy due to plastic deformation is discussed. An analysis of the criterion for discrimination of recrystallized grains is proposed. Finally, the ability of the framework to model continuous dynamic and post-dynamic recrystallization is assessed upon a case study. The influence of grain boundary properties and of nucleation rules are studied. The representativity of the results in regards of experimental data will be discussed in an upcoming article.
Investigating exclusive $ρ^0$ photoproduction within the Regge phenomenology approach
Creators: name: Jenkovszky, László
name: Rocha, Érison dos Santos
name: Machado, Magno V. T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The elastic differential and integrated total cross section for the exclusive $ρ^0$ photoproduction in electron-proton ($ep$) collisions are evaluated taking into account nonperturbative Pomeron exchange approach. By using three different models based on Regge phenomenology the results are compared to recent measurements by H1 Collaboration in $ep$ collisions and by the CMS collaboration from ultraperipheral proton-lead collisions. The analysis is expanded by calculating the coherent nuclear cross section, $σ(γA\rightarrow ρ^0 A)$, which is applied to $ρ^0$ production in ultraperipheral lead-lead and xenon-xenon collisions. The predictions are compared to the measurements performed by ALICE Collaboration. Aspects of the theoretical uncertainties and limitations of the formalism are scrutinized.
Raman spectroscopy of graphene and bilayer under biaxial strain: bubbles and balloons
Creators: name: Zabel, Jakob
name: Nair, Rahul R.
name: Ott, Anna
name: Georgiou, Thanasis
name: Geim, Andre K.
name: Novoselov, Kostya S.
name: Casiraghi, Cinzia
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this letter we use graphene bubbles to study the Raman spectrum of graphene under biaxial (e.g. isotropic) strain. Our Gruneisen parameters are in excellent agreement with the theoretical values. Discrepancy in the previously reported values is attributed to the interaction of graphene with the substrate. Bilayer balloons (intentionally pressurized membranes) have been used to avoid the effect of the substrate and to study the dependence of strain on the inter-layer interactions.
description: 14 pages, 4 figures
Distributed super dense coding over noisy channels
Creators: name: Shadman, Zahra
name: Kampermann, Hermann
name: Macchiavello, Chiara
name: Bruss, Dagmar
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study multipartite super dense coding in the presence of a covariant noisy channel. We investigate the case of many senders and one receiver, considering both unitary and non-unitary encoding. We study the scenarios where the senders apply local encoding or global encoding. We show that, up to some pre-processing on the original state, the senders cannot do better encoding than local, unitary encoding. We then introduce general Pauli channels as a significant example of covariant maps. Considering Pauli channels, we provide examples for which the super dense coding capacity is explicitly determined.
RigbySpace: A Fully Recursive, Rational Foundation for Physics, Time, and Cosmology
Creators: name: Veneziano, D
Publisher: name: Zenodo
Year: 2025

description: RigbySpace (RS) proposes a radical departure from the continuum-based paradigms that underlie classical physics, general relativity, and quantum field theory. Rejecting irrational constants, infinite quantities, and unmeasurable abstractions, RS replaces the smooth spacetime manifold with a fully recursive, discrete lattice defined entirely by rational quantities and finite steps. Every law of motion, field interaction, curvature, or quantum behavior is modeled not through calculus but through recursive imbalance propagation governed by exact relations. This document offers an expanded synthesis of RS as a physical ontology: a cosmology, quantum mechanics, and cognitive architecture in one. We present its laws, derive its field equations, explore its implications for black hole thermodynamics, time, and the structure of consciousness, and demonstrate its falsifiable predictions for future observation. If true, RS is not a reformulation. It is a replacement. Not a model of the universe—but the mechanism itself.
Effects of local curvature on epithelia tissue -- coordinated rotational movement and other spatiotemporal arrangements
Creators: name: Happel, Lea
name: Wenzel, Dennis
name: Voigt, Axel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Coordinated movements of epithelia tissue are linked with active matter processes. We here consider the influence of curvature on the spatiotemporal arrangements and the shapes of the cells. The cells are represented by a multiphase field model which is defined on the surface of a sphere. Besides the classical solid and liquid phases, which depend on the curvature of the sphere, on mechanical properties of the cells and the strength of activity, we identify a phase of global rotation. This rotation provides a coordinated cellular movement which can be linked to tissue morphogenesis. This investigation on a sphere is a first step to investigate the delicate interplay between topological constraints, geometric properties and collective motion. Besides the rotational state we also analyse positional defects, identify global nematic order and study the associated orientational defects.
description: 7 pages, 8 figures
Modelling Spatial Interactions in the Arbuscular Mycorrhizal Symbiosis using the Calculus of Wrapped Compartments
Creators: name: Calcagno, Cristina
name: Coppo, Mario
name: Damiani, Ferruccio
name: Drocco, Maurizio
name: Sciacca, Eva
name: Spinella, Salvatore
name: Troina, Angelo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences
subject: F.4.2; I.6; J.3

description: Arbuscular mycorrhiza (AM) is the most wide-spread plant-fungus symbiosis on earth. Investigating this kind of symbiosis is considered one of the most promising ways to develop methods to nurture plants in more natural manners, avoiding the complex chemical productions used nowadays to produce artificial fertilizers. In previous work we used the Calculus of Wrapped Compartments (CWC) to investigate different phases of the AM symbiosis. In this paper, we continue this line of research by modelling the colonisation of the plant root cells by the fungal hyphae spreading in the soil. This study requires the description of some spatial interaction. Although CWC has no explicit feature modelling a spatial geometry, the compartment labelling feature can be effectively exploited to define a discrete surface topology outlining the relevant sectors which determine the spatial properties of the system under consideration. Different situations and interesting spatial properties can be modelled and analysed in such a lightweight framework (which has not an explicit notion of geometry with coordinates and spatial metrics), thus exploiting the existing CWC simulation tool.
description: In Proceedings CompMod 2011, arXiv:1109.1044
Measurement of the transverse asymmetry of $γ$-rays in the $^{117}$Sn(n,$γ$)$^{118}$Sn reaction
Creators: name: Endo, S.
name: Okudaira, T.
name: Abe, R.
name: Fujioka, H.
name: Hirota, K.
name: Kimura, A.
name: Kitaguchi, M.
name: Oku, T.
name: Sakai, K.
name: Shima, T.
name: Shimizu, H. M.
name: Takada, S.
name: Takahashi, S.
name: Yamamoto, T.
name: Yoshikawa, H.
name: Yoshioka, T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Largely enhanced parity-violating effects observed in compound resonances induced by epithermal neutrons are currently attributed to the mixing of parity-unfavored partial amplitudes in the entrance channel of the compound states. Furthermore, it is proposed that the same mechanism that enhances the parity-violation also enhances the breaking of time-reversal-invariance in the compound nucleus. The entrance-channel mixing induces energy-dependent spin-angular correlations of individual $γ$-rays emitted from the compound nuclear state. For a detailed study of the mixing model, a $γ$-ray yield in the reaction of $^{117}$Sn(n,$γ$)$^{118}$Sn was measured using the pulsed beam of polarized epithermal neutrons and Ge detectors. An angular dependence of asymmetric $γ$-ray yields for the orientation of the neutron polarization was observed.
description: 7 pages, 10 figures
A degenerating convection-diffusion system modelling froth flotation with drainage
Creators: name: Bürger, Raimund
name: Diehl, Stefan
name: Martí, M. Carmen
name: Vásquez, Yolanda
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35L65, 35P05, 35R05

description: Froth flotation is a common unit operation used in mineral processing. It serves to separate valuable mineral particles from worthless gangue particles in finely ground ores. The valuable mineral particles are hydrophobic and attach to bubbles of air injected into the pulp. This creates bubble-particle aggregates that rise to the top of the flotation column where they accumulate to a froth or foam layer that is removed through a launder for further processing. At the same time, the hydrophilic gangue particles settle and are removed continuously. The drainage of liquid due to capillarity is essential for the formation of a stable froth layer. This effect is included into a previously formulated hyperbolic system of partial differential equations that models the volume fractions of floating aggregates and settling hydrophilic solids [R. Bürger, S. Diehl and M.C. Martí, {\it IMA J. Appl. Math.} {\bf 84} (2019) 930--973]. The construction of desired steady-state solutions with a froth layer is detailed and feasibility conditions on the feed volume fractions and the volumetric flows of feed, underflow and wash water are visualized in so-called operating charts. A monotone numerical scheme is derived and employed to simulate the dynamic behaviour of a flotation column. It is also proven that, under a suitable Courant-Friedrichs-Lewy (CFL) condition, the approximate volume fractions are bounded between zero and one when the initial data are.
Discrimination between Arabic and Latin from bilingual documents
Creators: name: Haboubi, Sofiene
name: Maddouri, Samia
name: Amiri, Hamid
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Computation and Language (cs.CL)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: 2011 International Conference on Communications, Computing and Control Applications (CCCA)
description: 5 pages
Operation, control and assessment of a full-scale membrane distillation unit for treating desalination brine in the context of greenhouse production
Creators: name: Andrés-Mañas, Juan Antonio
name: Gil Vergel, Juan Diego
name: Sanchez-Molina, Jorge Antonio
name: Berenguel, Manuel
name: Zaragoza, Guillermo
Publisher: name: Journal of Cleaner Production
Year: 2025
Subjects: Vacuum air-gap membrane distillation
Pilot-scale membrane distillation
Thermal desalination
Brine concentration
process control

description: Membrane distillation (MD) is a thermal desalination technology with a niche application in the concentration of brines. This paper aims to assess the operation, control, and performance of the largest full-scale vacuum-assisted air-gap membrane distillation (V-AGMD) system reported to date in the literature, using biomass heat as thermal source and real brine from a reverse osmosis unit with salinity 63.7 g/L^-1 as feed. The levelized cost of water of a large-scale V-AGMD plant has been estimated using experimental results. The MD unit comprises up to ten multi-envelope air-gap modules, and is installed in the facilities of the AgroConnect project at IFAPA, an agricultural research centre close to the University of Almería (Spain). Results show that cooling limitations in the V-AGMD operation cancel out the beneficial effect of vacuum assistance on vapor diffusion, especially when the feed temperature and the feed flow rate are increased, hindering the condensation, and hence reducing the permeate productivity even down to 40% in comparison with conventional AGMD operation. This work demonstrates that full-scale V-AGMD can take part in a future optimized sustainable water network to supply water for intensive agricultural activity in the south-east of Spain, although a sufficient cooling supply is mandatory to avoid operational issues.
Quo vadis universitas?
Creators: name: Guski, Hans
Publisher: name: Diagnostic Pathology
Year: 2015
Subjects: University formation, driving forces, structural defaults, the guild concept, university reformation, successful and failed reforms, the Bologna process, bachelor and master degree courses, excellence cluster, elite universities, university ranking, caus

description: The article considers the advantages and disadvantages of the European universities that can be explained only by the analysis of their history. In contrast to the conventional theories, the economic enforcement was the driving cause for university formation in the Middle Ages. The guild concept created by Siegfried Bär 15 years ago explains the historical imperative, but also the construction faults of the universities resulting from their specific features essentially the principles of self-autonomy and cooptation. The faults of university organization are the main reasons why nearly all university reforms failed. There does not exist any convincing proof that the introduction of new organization models such as bachelor and master degree courses or excellence clusters are of more efficiency in teaching and research. The international university ranking did not change in recent years; the top ten universities are still located in the USA and Great Britain. The majority of German universities range between the middle and the end of the ranking list. It is demonstrated that the main causes of this discrepancy are the delay of academic qualification, the lack of competition, the dependency of the public policy, and the insufficient financial support. Progress in university research and teaching can be obtained only if these problems can be solved.
description: Diagnostic Pathology, 2015
An analytical model of Faraday rotation in hot alkali metal vapours
Creators: name: Kemp, Stefan L
name: Hughes, Ifan G
name: Cornish, Simon L
Publisher: name: arXiv
Year: 2011
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We report a thorough investigation into the absorptive and dispersive properties of hot caesium vapour, culminating in the development of a simple analytical model for off-resonant Faraday rotation. The model, applicable to all hot alkali metal vapours, is seen to predict the rotation observed in caesium, at temperatures as high as 115 $^{\circ}$C, to within 1% accuracy for probe light detuned by greater than 2 GHz from the $D_{2}$ lines. We also demonstrate the existence of a weak probe intensity limit, below which the effect of hyperfine pumping is negligible. Following the identification of this regime we validate a more comprehensive model for the absorption and dispersion in the vicinity of the $D_{2}$ lines, implemented in the form of a computer code. We demonstrate the ability of this model to predict Doppler-broadened spectra to within 0.5% rms deviation for temperatures up to 50 $^{\circ}$C.
description: 7 pages, 6 figures
Operation, control and assessment of a full-scale membrane distillation unit for treating desalination brine in the context of greenhouse production
Creators: name: Andrés-Mañas, Juan Antonio
name: Gil Vergel, Juan Diego
name: Sanchez-Molina, Jorge Antonio
name: Berenguel, Manuel
name: Zaragoza, Guillermo
Publisher: name: Journal of Cleaner Production
Year: 2025
Subjects: Vacuum air-gap membrane distillation
Pilot-scale membrane distillation
Thermal desalination
Brine concentration
process control

description: Membrane distillation (MD) is a thermal desalination technology with a niche application in the concentration of brines. This paper aims to assess the operation, control, and performance of the largest full-scale vacuum-assisted air-gap membrane distillation (V-AGMD) system reported to date in the literature, using biomass heat as thermal source and real brine from a reverse osmosis unit with salinity 63.7 g\L-1 as feed. The levelized cost of water of a large-scale V-AGMD plant has been estimated using experimental results. The MD unit comprises up to ten multi-envelope air-gap modules, and is installed in the facilities of the AgroConnect project at IFAPA, an agricultural research centre close to the University of Almería (Spain). Results show that cooling limitations in the V-AGMD operation cancel out the beneficial effect of vacuum assistance on vapor diffusion, especially when the feed temperature and the feed flow rate are increased, hindering the condensation, and hence reducing the permeate productivity even down to 40 % in comparison with conventional AGMD operation. This work demonstrates that full-scale V-AGMD can take part in a future optimized sustainable water network to supply water for intensive agricultural activity in the south-east of Spain, although a sufficient cooling supply is mandatory to avoid operational issues.
Ticketing System: A Descriptive Research on the Use of Ticketing System for Project Management and Issue Tracking in IT Companies
Creators: name: Aglibar, Kent Darryl
name: Alegre, Garret Christopher
name: Del Mundo, Gerald
name: Duro, Kenny Francis
name: Rodelas, Nelson
Publisher: name: arXiv
Year: 2022
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: IT companies are popular in the present time as technology arises in the entire world. Incidents and Requests for either clients or company internal are hard to manually track as it is a day-to-day transaction. To keep all the logs, IT Companies are using a ticketing system to track all the records they are gathering. One of the most popular ticketing systems is the JIRA. Either the support team or company internal is benefitting from the use of JIRA as it easily documents all the different transactions and keeps track of different incidents and requests. One of the cons of JIRA is its limited features. The researchers conducted research where it aims to determine the effectiveness of JIRA as a ticketing system despite its limited features. The researchers used a descriptive method to analyze the pros and cons of this ticketing system. It is concluded that this JIRA Ticketing system is helpful for both support groups and internal members of the company as they track all the incidents and request tickets for their clients despite the limited features of JIRA. The researchers strongly recommend to venture out and try other analytic models and start with the ones mentioned in this study for a good foundation and idea. This is can provide the research a new set of results that can be useful to both established and startup companies.
description: presented in National Research Conference in Computer Engineering and Technology
On Discrete R-Symmetries in MSSM and its Extensions
Creators: name: Paraskevas, M.
name: Tamvakis, K.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study possible anomaly-free discrete R-symmetries that avoid the μ-problem and the dangerous D\leq 5 operators considering charge assignments that do not commute with the traditional grand unifying simple groups, such as SU(5) or SO(10), but commute instead with the so-called flipped-SU(5), with or without the operation of the GS mechanism. We find Z_N symmetries with N = 3, 6 in the anomaly-free case or N = 3, 4, 6, 8, 12, 24 in the case of anomaly cancellation through the Green-Schwartz mechanism. Non-unified cases (Z_5) have also been discussed. We also confront the construction of a 4D grand unified flipped-SU(5) model endowed with Z_N and find phenomenologically acceptable solutions with N = 2k+7 and N = 2k+10.
description: 14 pages
Thulium and ytterbium-doped titania thin films deposited by MOCVD
Creators: name: Forissier, Sébastien
name: Roussel, Hervé
name: Jimenez, Carmen
name: Chaix, Odette
name: Pereira, Antonio
name: Bensalah-Ledoux, Amina
name: Deschanvres, Jean-Luc
name: Moine, Bernard
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this study we synthesized thin films of titanium oxide doped with thulium and/or ytterbium to modify the incident spectrum on the solar cells. This could be achieved either by photoluminescence up-converting devices, or down-converting devices. As down-converter thin films our work deals with thulium and ytterbium-doped titanium dioxide. Thulium and ytterbium will act as sensitizer and emitter, respectively. The rare-earth doped thin films are deposited by aerosol-assisted MOCVD using organo-metallic precursors such as titanium dioxide acetylacetonate, thulium and ytterbium tetramethylheptanedionate solved in different solvents. These films have been deposited on silicon substrates under different deposition conditions (temperature and dopant concentrations for example). Adherent films have been obtained for deposition temperatures ranging from 300°C to 600°C. The deposition rate varies from 0.1 to 1 μm/h. The anatase phase is obtained at substrate temperature above 400°C. Further annealing is required to exhibit luminescence and eliminate organic remnants of the precursors. The physicochemical and luminescent properties of the deposited films were analyzed versus the different deposition parameters and annealing conditions. We showed that absorbed light in the near-UV blue range is re-emitted by the ytterbium at 980 nm and by a thulium band around 800 nm.
description: 4 pages, 6 figures, proceeding
Über Grundlagen für den mathematischen Linienriß eines Frachtschiffes
Creators: name: Thieme, Hans
Publisher: name: TUHH Universitätsbibliothek
Year: 1956
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Über Grundlagen für den mathematischen Linienriß eines Frachtschiffes
The Perception of Filipinos on the Advent of Cryptocurrency and Non-Fungible Token (NFT) Games
Creators: name: Francisco, Ryan
name: Rodelas, Nelson
name: Ubaldo, John Edison
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: This study aims to shed light on the rise of play-to-earn games in the Philippines alongside cryptocurrency. The lack of research and public understanding of its benefits and drawbacks prompted the researchers to investigate its market. As such, the study tried to look into the risks and benefits of crypto gaming if it would be regulated by the government, and how market volatility influences the churn rate of crypto games. The research used a descriptive study to determine the perception of people who are engaged in playing a crypto-game named as Axie Infinity. The results showed that most players spend their time playing Axie Infinity for about 1 to 4 hours a day. Predominantly, the return of investments for playing the game will take about 1 to 3 months. It also showed that these players agreed that there is a possible financial instability in a volatile market. With this, they have a high trust issue in terms of price manipulation, privacy and security, and its design and usability. Understanding the cryptocurrency market requires comprehending the perspective of the people who are engaged in a play-to-earn game, and their concerns are critical for any government actions aimed at regulating self-employed income earners playing (Non-fungible Tokens) NFT games in the Philippines.
description: presented in National Research Conference in Computer Engineering and Technology
The resolved scaling relations in DustPedia: Zooming in on the local Universe
Creators: name: Casasola, Viviana
name: Bianchi, Simone
name: Magrini, Laura
name: Mosenkov, Aleksandr V.
name: Salvestrini, Francesco
name: Baes, Maarten
name: Calura, Francesco
name: Cassara', Letizia P.
name: Clark, Christopher J. R.
name: Corbelli, Edvige
name: Fritz, Jacopo
name: Galliano, Frederic
name: Liuzzo, Elisabetta
name: Madden, Suzanne
name: Nersesian, Angelos
name: Pozzi, Francesca
name: Roychowdhury, Sambit
name: Baronchelli, Ivano
name: Bonato, Matteo
name: Gruppioni, Carlotta
name: Pantoni, Lara
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We perform a homogeneous analysis of an unprecedented set of spatially resolved scaling relations (SRs) between ISM components and other properties in the range of scales 0.3-3.4 kpc. We also study some ratios: dust-to-stellar, dust-to-gas, and dust-to-metal. We use a sample of 18 large, spiral, face-on DustPedia galaxies. All the SRs are moderate/strong correlations except the dust-HI SR that does not exist or is weak for most galaxies. The SRs do not have a universal form but each galaxy is characterized by distinct correlations, affected by local processes and galaxy peculiarities. The SRs hold starting from 0.3 kpc, and if a breaking down scale exists it is < 0.3 kpc. By evaluating all galaxies at 3.4 kpc, differences due to peculiarities of individual galaxies are cancelled out and the corresponding SRs are consistent with those of whole galaxies. By comparing subgalactic and global scales, the most striking result emerges from the SRs involving ISM components: the dust-total gas SR is a good correlation at all scales, while the dust-H2 and dust-HI SRs are good correlations at subkpc/kpc and total scales, respectively. For the other explored SRs, there is a good agreement between small and global scales and this may support the picture where the main physical processes regulating the properties and evolution of galaxies occur locally. Our results are consistent with the hypothesis of self-regulation of the SF process. The analysis of subgalactic ratios shows that they are consistent with those derived for whole galaxies, from low to high z, supporting the idea that also these ratios could be set by local processes. Our results highlight the heterogeneity of galaxy properties and the importance of resolved studies on local galaxies in the context of galaxy evolution. They also provide observational constraints to theoretical models and updated references for high-z studies.
description: 42 pages, 11 figures and 5 tables in the main text, 2 figures and 1 table in Appendix. Accepted for publication in A&A
Measuring the orbit shrinkage rate of hot Jupiters due to tides
Creators: name: Rosário, N. M.
name: Barros, S. C. C.
name: Demangeon, O. D. S.
name: Santos, N. C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: A tidal interaction between a star and a close-in exoplanet leads to shrinkage of the planetary orbit and eventual tidal disruption of the planet. Measuring the shrinkage of the orbits will allow for the tidal quality parameter of the star ($Q'_\star$) to be measured, which is an important parameter to obtain information about stellar interiors. We analyse data from TESS for two targets known to host close-in hot Jupiters, WASP-18 and WASP-19, to measure the current limits on orbital period variation and provide new constrains on $Q'_\star$. We modelled the transit shape using all the available TESS observations and fitted the individual transit times of each transit. We used previously published transit times together with our results to fit two models, a constant period model, and a quadratic orbital decay model, MCMC algorithms. We find period change rates of $(-0.11\pm0.21)\times10^{-10}$ for WASP-18b and $(-0.35\pm0.22)\times10^{-10}$ for WASP-19b and we do not find significant evidence of orbital decay in these targets. We obtain new lower limits for $Q'_\star$ of $(1.42\pm0.34)\times10^7$ in WASP-18 and $(1.26\pm0.10)\times10^6$ in WASP-19, corresponding to upper limits of the orbital decay rate of $-0.45\times10^{-10}$ and $-0.71\times10^{-10}$, respectively, with a 95% confidence level. We compare our results with other relevant targets for tidal decay studies. We find that the orbital decay rate in both WASP-18b and WASP-19b appears to be smaller than the measured orbital decay of WASP-12b. We show that the minimum value of $Q'_\star$ in WASP-18 is two orders of magnitude higher than that of WASP-12, while WASP-19 has a minimum value one order of magnitude higher, which is consistent with other similar targets. Further observations are required to constrain the orbital decay of WASP-18 and WASP-19.
description: 10 pages plus 5-page appendix. To be published in Astronomy and Astrophysics
Programmable models of growth and mutation of cancer-cell populations
Creators: name: Bortolussi, Luca
name: Policriti, Alberto
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Cell Behavior (q-bio.CB)
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences
subject: J.3; I.6.5; I.6.2

description: In this paper we propose a systematic approach to construct mathematical models describing populations of cancer-cells at different stages of disease development. The methodology we propose is based on stochastic Concurrent Constraint Programming, a flexible stochastic modelling language. The methodology is tested on (and partially motivated by) the study of prostate cancer. In particular, we prove how our method is suitable to systematically reconstruct different mathematical models of prostate cancer growth - together with interactions with different kinds of hormone therapy - at different levels of refinement.
description: In Proceedings CompMod 2011, arXiv:1109.1044