cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Towards a terramechanics for bio-inspired locomotion in granular environments
Creators: name: Li, Chen
name: Ding, Yang
name: Gravish, Nick
name: Maladen, Ryan D.
name: Masse, Andrew
name: Umbanhowar, Paul B.
name: Komsuoglu, Haldun
name: Koditschek, Daniel E.
name: Goldman, Daniel I.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Systems and Control (eess.SY)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Biological sciences

description: Granular media (GM) present locomotor challenges for terrestrial and extraterrestrial devices because they can flow and solidify in response to localized intrusion of wheels, limbs, and bodies. While the development of airplanes and submarines is aided by understanding of hydrodynamics, fundamental theory does not yet exist to describe the complex interactions of locomotors with GM. In this paper, we use experimental, computational, and theoretical approaches to develop a terramechanics for bio-inspired locomotion in granular environments. We use a fluidized bed to prepare GM with a desired global packing fraction, and use empirical force measurements and the Discrete Element Method (DEM) to elucidate interaction mechanics during locomotion-relevant intrusions in GM such as vertical penetration and horizontal drag. We develop a resistive force theory (RFT) to account for more complex intrusions. We use these force models to understand the locomotor performance of two bio-inspired robots moving on and within GM.
Optimization of the synthesis of het/aryl-amidoximes using an efficient green chemistry
Creators: name: Albayati, Mustafa R.
name: Mohamed, Mamdouh F. A.
name: Moustafa, Amr H.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: This work focuses on optimizing an efficient green synthesis of arylamidoximes from appropriate nitrile and hydroxylamine hydrochloride in water and triethylamine (1.6 mol equivalent) as a base at room temperature for 6 h. This new green synthetic methodology is compared with previously known methods. The main advantages of this new process reported are good yield, easier work-up and short reaction times. Moreover, some of the synthesized arylamidoximes converted to 1,2,4-oxadiazole derivatives 13a,b and 14 via the reaction with (4-acetylphenoxy)acetic acid 12.
Os problemas de formação no uso das novas técnicas em Portugal
Creators: name: Silva, Gabriela Lopes
Publisher: name: Cadernos BAD
Year: 2003

description: Apresenta-se de forma sintética o panorama da formação profissional no domínio da Informação em Portugal. Salientam-se algumas características do curriculum do novo curso de especialização para bibliotecários e documentalistas que revelam a preocupação de preparar estes profissionais para a aplicação das novas tecnologias neste campo.
description: Cadernos BAD, N.º 1 (1983)
Emulating moir\'e materials with quasiperiodic circuit quantum electrodynamics
Creators: name: Herrig, Tobias
name: Koliofoti, Christina
name: Pixley, Jedediah H.
name: König, Elio J.
name: Riwar, Roman-Pascal
Publisher: name: Forschungzentrum Jülich
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: arXiv (2023).
description: Topological bandstructures interfering with moir\'e superstructures give rise to a plethora of emergent phenomena, which are pivotal for correlated insulating and superconducting states of twisttronics materials. While quasiperiodicity was up to now a notion mostly reserved for solid-state materials and cold atoms, we here demonstrate the capacity of conventional superconducting circuits to emulate moir\'e physics in charge space. With two examples, we show that Hofstadter's butterfly and the magic-angle effect, are directly visible in spectroscopic transport measurements. Importantly, these features survive in the presence of harmonic trapping potentials due to parasitic linear capacitances. Our proposed platform benefits from unprecedented tuning capabilities, and opens the door to probe incommensurate physics in virtually any spatial dimension.
description: Published by arXiv
Thermal lifetime of breathers
Creators: name: Archilla, Juan F. R.
name: Bajārs, Jānis
name: Flach, Sergej
Publisher: name: arXiv
Year: 2024
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: In this article, we explore the lifetime of localized excitations in nonlinear lattices, called breathers, when a thermalized lattice is perturbed with localized energy delivered to a single site. We develop a method to measure the time it takes for the system to approach equilibrium based on a single scalar quantity, the participation number, and deduce the value corresponding to thermal equilibrium. We observe the time to achieve thermalization as a function of the energy of the excited site. We explore a variety of different physical system models. The result is that the lifetime of breathers increases exponentially with the breather energy for all the systems. This increase becomes observable when this energy is larger than approximately ten times the local average thermal energy. These results may provide a method to detect the existence of breathers in real systems.
description: 25 pages, 14 figures
The K band galaxy luminosity functions of three massive high redshift clusters of galaxies
Creators: name: Ellis, S. C.
name: Jones, L. R.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: K band observations of the galaxy populations of three high redshift (z=0.8-1.0), X-ray selected, massive clusters are presented. The observations reach a depth of K=21.5, corresponding to K*+3.5 mag. The evolution of the galaxy properties are discussed in terms of their K band luminosity functions and the K band Hubble diagram of brightest cluster galaxies. The bulk of the galaxy luminosities, as characterised by the parameter K* from the Schechter (1976) function, are found to be consistent with passive evolution with a redshift of formation of z_f~1.5-2. This is consistent with observations of other high redshift clusters, but may be in disagreement with galaxies in the field at similar redshifts. A good match to the shape of the Coma cluster luminosity function is found by simply dimming the high redshift luminosity function by an amount consistent with passive evolution. The evolution of the cumulative fraction of K band light as a function of luminosity shows no evidence of merger activity in the brighter galaxies. The evolution of the brightest cluster galaxies (BCGs) is tested by their K band Hubble diagram and by the fraction of K band cluster light in the BCGs. The evolution observed is consistent with recent previous observations although the scatter in the Hubble diagram allows for a range of evolutionary histories. The fraction of cluster light contained in the BCGs is not smaller than that in Coma, suggesting that they are already very massive with no need to hypothesise significant mergers in their futures.
description: 12 pages, 12 figures. Accepted for publication in MNRAS
Electromagnetically induced left-handedness in a dense gas of three level atoms
Creators: name: Oktel, M. O.
name: Müstecaplıoğlu, Ö. E.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We discuss how a three level system can be used to change the frequency dependent magnetic permeability of an atomic gas to be significantly different from one. We derive the conditions for such a scheme to be successful and briefly discuss the resulting macroscopic electrodynamics. We find that it may be possible to obtain left handed electrodynamics for an atomic gas using three atomic levels.
description: 7 pages,3 figures
Association between antecedent blood pressure, hypertension-mediated organ damage and cardiovascular outcome
Creators: name: Olesen, Thomas B.
name: Manan Pareek
name: Stidsen, Jacob V.
name: Blicher, Marie K.
name: Rasmussen, Susanne
name: Vishram-Nielsen, Julie K. K.
name: Maagaard, Louise
name: Olsen, Michael H.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: Biotechnology
subject: 69999 Biological Sciences not elsewhere classified
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Purpose: The objective of this study was to test if combining antecedent systolic blood pressure (SBP) with traditional risk factors and hypertension-mediated organ damage (HMOD) improves risk stratification for subsequent cardiovascular disease. Materials and methods: 1910 subjects participated in this study. Antecedent SBP was defined as the average of measurements obtained in 1982 and in 1987. Current SBP was obtained in 1993. HMOD were examined in 1993. HMOD was defined as either atherosclerotic plaque(s), increased pulse wave velocity, increased urine albumin creatinine ratio (above the 90th percentile) or left ventricular hypertrophy. Major adverse cardiovascular events (MACE) including myocardial infarction, cerebrovascular disease, heart failure and arrhythmia were obtained from national registries. Results: Subjects were divided into two age categories: a middle-aged group (aged 41 or 51) and an older group (aged 61 or 71). From 1993 to 2010, 425 events were observed. In multivariable analysis with both current and antecedent SBP adjusted for traditional risk factors, current SBP was associated with each measure of HMOD whilst antecedent SBP was not significantly associated with urine albumin creatinine ratio in the older group, LVMI in the middle-aged group, or the presence of plaque in any of the age groups (all p > 0.15). When current and antecedent SBP were evaluated together, current SBP was not associated with MACE in the middle-aged subgroup [HR = 1.09 (0.96–1.22), p = 0.18] but remained associated with MACE in the older subgroup [HR = 1.21 (1.10–1.34), p p = 0.02]. Adding antecedent SBP to traditional risk factors did not improve the predictive accuracy of the survival model. Conclusion: In healthy non-medicated middle-aged subjects, antecedent SBP is associated with cardiovascular outcome independently of current BP, traditional risk factors and HMOD. However, improvement in risk stratification seems to be limited.
Integrating Low-Power Wide-Area Networks for Enhanced Scalability and Extended Coverage
Creators: name: Rahman, Mahbubur
name: Saifullah, Abusayeed
Publisher: name: arXiv
Year: 2020
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Low-Power Wide-Area Networks (LPWANs) are evolving as an enabling technology for Internet-of-Things (IoT) due to their capability of communicating over long distances at very low transmission power. Existing LPWAN technologies, however, face limitations in meeting scalability and covering very wide areas which make their adoption challenging for future IoT applications, especially in infrastructure-limited rural areas. To address this limitation, in this paper, we consider achieving scal-ability and extended coverage by integrating multiple LPWANs. SNOW (Sensor Network Over White Spaces), a recently proposed LPWAN architecture over the TV white spaces, has demonstrated its advantages over existing LPWANs in performance and energy-efficiency. In this paper, we propose to scale up LPWANs through a seamless integration of multiple SNOWs which enables concurrent inter-SNOW and intra-SNOW communications. We then formulate the tradeoff between scalability and inter-SNOW interference as a constrained optimization problem whose objective is to maximize scalability by managing white space spectrum sharing across multiple SNOWs. We also prove the NP-hardness of this problem. To this extent, We propose an intuitive polynomial-time heuristic algorithm for solving the scalability optimization problem which is highly efficient in practice. For the sake of theoretical bound, we also propose a simple polynomial-time 1/2-approximation algorithm for the scalability optimization problem. Hardware experiments through deployment in an area of (25x15)sq. km as well as large scale simulations demonstrate the effectiveness of our algorithms and feasibility of achieving scalability through seamless integration of SNOWs with high reliability, low latency, and energy efficiency.
description: IEEE/ACM Transactions on Networking
Temperature and density profiles in the corona of main-sequence stars induced by stochastic heating in the chromosphere
Creators: name: Barbieri, Luca
name: Casetti, Lapo
name: Verdini, Andrea
name: Landi, Simone
Publisher: name: arXiv
Year: 2024
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: All but the most massive main-sequence stars are expected to have a rarefied and hot (million-Kelvin) corona like the Sun. How such a hot corona is formed and supported has not been completely understood yet, even in the case of the Sun. Recently, Barbieri et al. (A&A 2024, J. Plasma Phys. 2024) introduced a new model of a confined plasma atmosphere and applied it to the solar case, showing that rapid, intense, intermittent and short-lived heating events in the high chromosphere can drive the coronal plasma into a stationary state with temperature and density profiles similar to those observed in the solar atmosphere. In this paper we apply the model to main-sequence stars, showing that it predicts the presence of a solar-like hot and rarefied corona for all such stars, regardless of their mass. However, the model is not applicable as such to the most massive main-sequence stars, because the latter lack the convective layer generating the magnetic field loop structures supporting a stationary corona, whose existence is assumed by the model. We also discuss the role of stellar mass in determining the shape of the temperature and density profiles.
description: 11 pages, 16 figures. Submitted to Astronomy and Astrophysics. Comments welcome
O desenvolvimento das bibliotecas universitárias em Portugal
Creators: name: Jones, Norah
Publisher: name: Cadernos BAD
Year: 2003

description: Apresentam-se alguns contrastes entre as bibliotecas universitárias portuguesas e anglo-americanas e propõem-se acções concretas para melhorar as condições de acesso e utilização das bibliotecas universitárias em Portugal.
description: Cadernos BAD, N.º 1 (1983)
The Precision of Mass Measurements Required for Robust Atmospheric Characterization of Transiting Exoplanets
Creators: name: Batalha, Natasha E.
name: Lewis, Taylor
name: Fortney, Jonathan J.
name: Batalha, Natalie M.
name: Kempton, Eliza
name: Lewis, Nikole K.
name: Line, Michael R.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Two of TESS's major science goals are to measure masses for 50 planets smaller than 4 Earth radii and to discover high-quality targets for atmospheric characterization efforts. It is important that these two goals are linked by quantifying what precision of mass constraint is required to yield robust atmospheric properties of planets. Here, we address this by conducting retrievals on simulated JWST transmission spectra under various assumptions for the degree of uncertainty in the planet's mass for a representative population of seven planets ranging from terrestrials to warm Neptunes to hot Jupiters. Only for the cloud-free, low metallicity gas giants are we able to infer exoplanet mass from transmission spectroscopy alone, to ~10% accuracy. For low metallicity cases (<4xSolar) we are able to accurately constrain atmospheric properties without prior knowledge of the planet's mass. For all other cases (including terrestrial-like planets), atmospheric properties can only be inferred with a mass precision of better than ~50%. At this level, though, the widths of the posterior distributions of the atmospheric properties are dominated by the uncertainties in mass. With a precision of ~20%, the widths of the posterior distributions are dominated by the spectroscopic data quality. Therefore, as a rule-of-thumb, we recommend: a ~50% mass precision for initial atmospheric characterization and a ~20% mass precision for more detailed atmospheric analyses.
description: Accepted ApJL, 9 pages, 4 figures, 1 table
title: Apports et limites des diagnostics sur des chenaux en confrontation avec les fouilles : l’exemple de Brissay-Choigny et Vendeuil (Aisne)
Creators: name: Flucher, Guy
name: Maréchal, Denis
Publisher: name: Inrap
Year: 2021

description: À Brissay-Choigny, de 2009 à 2015, 42,7 ha ont été diagnostiqués essentiellement sur un espace de chenaux fossilisés, dans le cadre d’une surveillance de carrière de granulats. Trois fouilles Inrap ont été réalisées sur ces zones humides. Le croisement critique de ces données permet de mettre en avant les acquis mais aussi les limites des diagnostics dans ces contextes particuliers.
description: In Brissay-Choigny, from 2009 to 2015, 42.7 ha were diagnosed mainly on a fossilized channel area as part of aggregate quarry monitoring. Three Inrap excavations were carried out on these wetlands. Critical cross-referencing of these data makes it possible to highlight not only the achievements but also the limitations of the diagnostics in these particular context
Three-dimensional relativistic simulations of rotating neutron-star collapse to a Kerr black hole
Creators: name: Baiotti, L.
name: Hawke, I.
name: Montero, P. J.
name: Loeffler, F.
name: Rezzolla, L.
name: Stergioulas, N.
name: Font, J. A.
name: Seidel, E.
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a new three-dimensional fully general-relativistic hydrodynamics code using high-resolution shock-capturing techniques and a conformal traceless formulation of the Einstein equations. Besides presenting a thorough set of tests which the code passes with very high accuracy, we discuss its application to the study of the gravitational collapse of uniformly rotating neutron stars to Kerr black holes. The initial stellar models are modelled as relativistic polytropes which are either secularly or dynamically unstable and with angular velocities which range from slow rotation to the mass-shedding limit. We investigate the gravitational collapse by carefully studying not only the dynamics of the matter, but also that of the trapped surfaces, i.e. of both the apparent and event horizons formed during the collapse. The use of these surfaces, together with the dynamical horizon framework, allows for a precise measurement of the black-hole mass and spin. The ability to successfully perform these simulations for sufficiently long times relies on excising a region of the computational domain which includes the singularity and is within the apparent horizon. The dynamics of the collapsing matter is strongly influenced by the initial amount of angular momentum in the progenitor star and, for initial models with sufficiently high angular velocities, the collapse can lead to the formation of an unstable disc in differential rotation. All the simulations performed with uniformly rotating initial data and a polytropic or ideal-fluid equation of state show no evidence of shocks or of the presence of matter on stable orbits outside the black hole.
description: 28 pages. Animations can be found at http://www.sissa.it/~rezzolla/Whisky/WhiskyI/
Parametrically driven nonlinear Dirac equation with arbitrary nonlinearity
Creators: name: Cooper, Fred
name: Khare, Avinash
name: Quintero, Niurka R.
name: Sánchez-Rey, Bernardo
name: Mertens, Franz G.
name: Saxena, Avadh
Publisher: name: arXiv
Year: 2019
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: The damped and parametrically driven nonlinear Dirac equation with arbitrary nonlinearity parameter $κ$ is analyzed, when the external force is periodic in space and given by $f(x) =r\cos(K x)$, both numerically and in a variational approximation using five collective coordinates (time dependent shape parameters of the wave function). Our variational approximation satisfies exactly the low-order moment equations. Because of competition between the spatial period of the external force $λ=2 π/K$, and the soliton width $l_s$, which is a function of the nonlinearity $κ$ as well as the initial frequency $ω_0$ of the solitary wave, there is a transition (at fixed $ω_0$) from trapped to unbound behavior of the soliton, which depends on the parameters $r$ and $K$ of the external force and the nonlinearity parameter $κ$. We previously studied this phenomena when $κ=1$ (2019 J. Phys. A: Math. Theor. {\bf 52} 285201) where we showed that for $λ\gg l_s$ the soliton oscillates in an effective potential, while for $λ\ll l_s$ it moves uniformly as a free particle. In this paper we focus on the $κ$ dependence of the transition from oscillatory to particle behavior and explicitly compare the curves of the transition regime found in the collective coordinate approximation as a function of $r$ and $K$ when $κ=1/2,1,2$ at fixed value of the frequency $ω_0$. Since the solitary wave gets narrower for fixed $ω_0$ as a function of $κ$, we expect and indeed find that the regime where the solitary wave is trapped is extended as we increase $κ$.
description: 13 pages, 4 figures
The complete experiment for $e^{\mp}N$ elastic scattering in presence of two-photon exchange
Creators: name: Rekalo, M. P.
name: Tomasi-Gustafsson, E.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We propose possible methods to measure the nucleon electromagnetic form factors in presence of two-photon exchange. Using a general parametrization of the spin structure of the matrix element for elastic $eN$-scattering, in terms of three independent complex amplitudes, we show that the measurements of the differential cross section for electron and positron nucleon elastic scattering, in the same kinematical conditions, allows to extract the nucleon electromagnetic form factors. The same is correct for the polarization method, with the measurement of the $P_{x,z}$ components of the final nucleon polarization (for the scattering of longitudinally polarized electrons and positrons). An alternative way, in absence of positron beam, is to measure a definite set of T-odd polarization observables, which includes three different experiments or only T-even observables, with five independent experiments. In both cases, the ratio $G_E(Q^2)/G_M(Q^2)$ is related to quantities of the order of $α$, which requires different polarization experiments of very high accuracy.
description: 11 pages v2: additional formulas, small corrections
Probing the Cosmological Principle with weak lensing shear
Creators: name: Adam, James
name: Maartens, Roy
name: Larena, Julien
name: Clarkson, Chris
Publisher: name: arXiv
Year: 2024
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Cosmological Principle is a cornerstone of the standard model of cosmology and shapes how we view the Universe and our place within it. It is imperative, then, to devise multiple observational tests which can identify and quantify possible violations of this foundational principle. One possible method of probing large-scale anisotropies involves the use of weak gravitational lensing. We revisit this approach in order to analyse the imprint of late-time anisotropic expansion on cosmic shear. We show that the cross-correlation of shear $E$- and $B$-modes on large scales can be used to constrain the magnitude (and possibly direction) of anisotropic expansion. We estimate the signal to noise for multipoles $10\lesssim \ell\lesssim 100$ that is achievable by a Euclid-like survey. Our findings suggest that such a survey could detect the $E$-$B$ signal for reasonable values of the late-time anisotropy parameter.
description: Added short explanation of Figure 3.1. Matches version accepted by JCAP
Complete higher dimensional global embedding structures of various black holes
Creators: name: Hong, Soon-Tae
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study global flat embeddings inside and outside of event horizons of black holes such as Schwarzschild and Reissner-Nordström black holes, and of de Sitter space. On these overall patches of the curved manifolds we investigate four accelerations and Hawking temperatures by introducing relevant Killing vectors.
description: 8 pages, revised with references added
Shock Structures and Velocity Fluctuations in the Noisy Burgers and KdV-Burgers Equations
Creators: name: Sakaguchi, H.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Statistical properties of the noisy Burgers and KdV-Burgers equations are numerically studied. It is found that shock-like structures appear in the time-averaged patterns for the case of stepwise fixed boundary conditions. Our results show that the shock structure for the noisy KdV-Burgers equation has an oscillating tail, even for the time averaged pattern. Also, we find that the width of the shock and the intensity of the velocity fluctuations in the shock region increase with system size.
description: 9 pages, 5 figures
An efficient one-pot synthesis of coumarin-amino acid derivatives as potential anti-inflammatory and antioxidant agents
Creators: name: Mamata Devendra Naik
name: Yadav D. Bodke
name: M, Vijay Kumar
name: Revanasiddappa BC
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Biophysics
subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified

description: A series of seven coumarinyl-amino acid ester conjugates have been synthesized and characterized by NMR (1H and 13C) and mass spectra. Further, the compounds were investigated for their therapeutic applications such as anti-inflammatory and antioxidant activities. Among the synthesized compounds most of the analogs showed good efficiency compared with the standard.
Basaltic quasi-mini-moon: Characterizing 2024 PT5 with the 10.4 m Gran Telescopio Canarias and the Two-meter Twin Telescope
Creators: name: Marcos, R. de la Fuente
name: de Leon, J.
name: Serra-Ricart, M.
name: Marcos, C. de la Fuente
name: Alarcon, M. R.
name: Licandro, J.
name: Geier, S.
name: Tejero, A.
name: Romero, A. Perez
name: Perez-Toledo, F.
name: Cabrera-Lavers, A.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Context. Small bodies in Earth-like orbits, the Arjunas, are good targets for scientific exploration, and space mining or in situ resource utilization (ISRU) trials as they enable low-cost missions. The subset of these objects that experience recurrent temporarily captured flyby or orbiter episodes are among the best ranked in terms of accessibility. Only a handful of objects are known to have engaged in such a dynamical behavior. Finding and characterizing more of them may help to expand scientific and commercial research activities in space over the next few decades. Asteroid 2024 PT5 is a recent finding that shows dynamical traits in common with this group.
 Aims. Here we investigate the orbital context of 2024 PT5 and its spectral and rotational properties.
 Methods. We studied the short-term orbital evolution of 2024 PT5 using direct N-body simulations. We identified its spectral class from the visible reflectance spectrum and used photometric observations to derive its rotational properties. Observational data were obtained with the OSIRIS camera spectrograph at the 10.4 m Gran Telescopio Canarias and the Two-meter Twin Telescope.
 Results. Asteroid 2024 PT5 experiences recurrent co-orbital engagements and episodes in which it has negative geocentric orbital energy while inside a geocentric distance under three Hill radii, which we call quasi-mini-moon events. Its visible spectrum is consistent with that of lunar-like silicates. Photometric data suggest a rotation period under 1 h.
 Conclusions. The discovery of 2024 PT5 confirms that events resembling temporary captures are relatively frequent and involve objects larger than a few meters, suitable as accessible targets for scientific research activities and demonstrating ISRU technologies.
description: 10 pages, 12 figures, 3 tables, 5 appendices, submitted to A&A Letters on 23 October 2024, accepted on 20 January 2025
PREVALENCE OF METABOLIC SYNDROME AMONG THE POPULATION IN SOME POLYCLINICS OF THE SAMARKAND REGION
Creators: name: Pulatova, K.S.
name: Ablyatifov, A.B.
Publisher: name: Zenodo
Year: 2024

description: Arterial hypertension and associated obesity of various degrees is one of the most pressing problems of modern medicine, associated with leading an unhealthy lifestyle. The concept of "healthy lifestyle" includes a rational diet, maintaining a normal body weight, regular and age-appropriate physical activity, giving up alcohol and tobacco. In 1981, scientists suggested that cases of a combination of different metabolic disorders should be designated by the term "metabolic syndrome”.
Cloud Tomography from Space using MISR and MODIS: Locating the "Veiled Core" in Opaque Convective Clouds
Creators: name: Forster, Linda
name: Davis, Anthony B.
name: Diner, David J.
name: Mayer, Bernhard
Publisher: name: arXiv
Year: 2019
Subjects: subject: Geophysics (physics.geo-ph)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: For passive satellite imagers, current retrievals of cloud optical thickness and effective particle size fail for convective clouds with 3D morphology. Indeed, being based on 1D radiative transfer (RT) theory, they work well only for horizontally homogeneous clouds. A promising approach for treating clouds as fully 3D objects is cloud tomography, and this has been demonstrated for airborne observations. For cloud tomography from space, however, more efficient forward 3D RT solvers are required. Here, we present a path forward, acknowledging that optically thick clouds have "veiled cores." Photons scattered into and out of this deep region do not contribute significant information to the observed imagery about the inner structure of the cloud. We investigate the location of the veiled core for the MISR and MODIS imagers. While MISR provides multi-angle imagery in the visible and near-IR, MODIS includes channels in the short-wave IR, albeit at a single view angle. This combination will enable future 3D retrievals to disentangle the cloud's effective particle size and optical thickness. We find that, in practice, the veiled core is located at an optical distance of $\approx$5 starting from the cloud boundary along the line-of-sight. For MODIS' absorbing wavelengths the veiled core covers a larger volume, starting at smaller optical distances. This result makes it possible to reduce the number of unknowns for the cloud tomographic reconstruction, and opens up new ways to increase the efficiency of the 3D RT solver at the heart of the reconstruction algorithm.
description: article submitted to Journal of Atmospheric Sciences
Editorial to the special issue in memory of Jean-Pierre Huiban
Creators: name: Gaigné, Carl
name: Schmitt, Bertrand
name: Sevestre, Patrick
name: Simioni, Michel
name: Gaigné, Carl
name: Schmitt, Bertrand
name: Sevestre, Patrick
name: Simioni, Michel
Publisher: name: Unknown
Year: 1909
Subjects: Financial Economics

description: This special issue of the Review of Agricultural, Food and Environmental Studies (RAFE) is dedicated to the memory of Jean-Pierre Huiban who passed away prematurely on 16 June 2013 at the age of 58 (he was born on 9 September 1954 in Ivry-sur-Seine, France). This follows the conference organised by INRA in his honour and memory on 27 January 2015. Jean-Pierre Huiban was a well-known and much-appreciated senior research fellow (Directeur de Recherche) at INRA, the French National Institute for Agricultural Research, where he had worked since 1985.
Algumas observações sobre o desenvolvimento das bibliotecas públicas em Portugal
Creators: name: Jones, Ken
Publisher: name: Cadernos BAD
Year: 2003

description: Regista algumas impressões sobre as bibliotecas públicas portuguesas, em contraste com as suas congéneres em países anglo-americanos e escandinavos e aponta algumas vias para o desenvolvimento de um tipo de biblioteca pública ou «popular» em Portugal mais centrada no utilizador.
description: Cadernos BAD, N.º 1 (1983)
The overlapping of nonlinear resonances and problem of quantum chaos
Creators: name: Ugulava, A.
name: Chotorlishvili, L.
name: Nickoladze, K.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The motion of a nonlinearly oscilating partical under the influence of a periodic sequence of short impulses is investigated. We analyze the Schrodinger equation for the universal Hamiltonian. The idea about the emerging of quantum chaos due to the adiabatic motion along the curves of Mathieu characteristics at multiple passages through the points of branching is advanced
description: 11 figures
Uma biblioteca para Ribeira de Pena
Creators: name: Botelho, Francisco
Publisher: name: Cadernos BAD
Year: 2003

description: Propõe a criação de uma biblioteca pública a partir da doação de um fundo erudito ao Concelho e chama a atenção para a necessidade de aquisição de obras actuais e de carácter popular.
description: Cadernos BAD, N.º 1 (1983)
Connections: How Can Farmers and Specialty Food Manufacturers Connect?
Creators: name: Lev, Larry
name: Feenstra, Gail
name: Hardesty, Shermain
name: Houston, Laurie
name: Joannides, Jan
name: King, Robert P.
name: Lev, Larry
name: Feenstra, Gail
name: Hardesty, Shermain
name: Houston, Laurie
name: Joannides, Jan
name: King, Robert P.
Publisher: name: Unknown
Year: 2018
Subjects: subject: Farm Management
subject: Food Consumption/Nutrition/Food Safety
subject: specialty food

description: Many specialty food manufacturers are sourcing ingredients from small and mid-sized farms. But how do manufacturers and farms find each other and how are the matches made? What can manufacturers and farmers do to make and maintain a good relationship? This fact sheet provides you with insights and recommendations.
description: Beyond Fresh and Direct project, USDA National Institute of Food and Agriculture
Effective interactions between star polymers
Creators: name: Hsu, Hsiao-Ping
name: Grassberger, Peter
Publisher: name: arXiv
Year: 2003
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study numerically the effective pair potential between star polymers with equal arm lengths and equal number $f$ of arms. The simulations were done for the soft core Domb-Joyce model on the simple cubic lattice, to minimize corrections to scaling and to allow for an unlimited number of arms. For the sampling, we used the pruned-enriched Rosenbluth method (PERM). We find that the potential is much less soft than claimed in previous papers, in particular for $f\gg 1$. While we verify the logarithmic divergence of $V(r)$, with $r$ being the distance between the two cores, predicted by Witten and Pincus, we find for $f>20$ that the Mayer function is hardly distinguishable from that for a Gaussian potential.
description: 5 pages, 5 figures
The host galaxies of radio-loud quasars at z>5 with ALMA
Creators: name: Mazzucchelli, C.
name: Decarli, R.
name: Belladitta, S.
name: Bañados, E.
name: Meyer, R. A.
name: Connor, T.
name: Momjian, E.
name: Rojas-Ruiz, S.
name: Eilers, A. -C.
name: Khusanova, Y.
name: Farina, E. P.
name: Drake, A. B.
name: Walter, F.
name: Wang, F.
name: Onoue, M.
name: Venemans, B. P.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The interaction between radio-jets and quasar host galaxies plays a paramount role in quasar/galaxy co-evolution. However, very little has been known so far about this interaction at very high-z. Here, we present new Atacama Large Millimeter/submillimeter Array (ALMA) observations in Band 7 and Band 3 of six radio-loud quasars' host galaxies at $z > 5$. We recover [CII] 158 $μ$m line and underlying dust continuum emission at $>2σ$ for five sources, while we obtain upper limits for the CO(6-5) emission line and continuum for the remaining source. At the spatial resolution of our observations ($\sim$1.0"-1.4"), we do not recover perturbed/extended morphologies or kinematics, signatures of potential mergers. These galaxies already host large quantities of gas, with [CII]-based star formation rates of $30-400 M_{\odot} $yr$^{-1}$. Building their radio/sub-mm spectral energy distributions (SEDs), we find that in at least four cases the 1mm continuum intensity arises from a combination of synchrotron and dust emission, with an initial estimation of synchrotron contribution at 300 GHz of $\gtrsim$10%. We compare the properties of the sources inspected here with a large collection of radio-quiet sources from the literature, as well as a sample of radio-loud quasars from previous studies, at comparable redshift. We recover a potential mild decrease in $L_{\rm [CII]}$ for the radio-loud sources, which might be due to a suppression of the cool gas emission due to the radio-jets. We do not find any [CII]-emitting companion galaxy candidate around the five radio-loud quasars observed in Band 7: given the depth of our dataset, this result is still consistent with that observed around radio-quiet quasars. Further higher-spatial resolution observations, over a larger frequency range, of high-z radio-loud quasars hosts will allow for a better understanding of the physics of such sources.
description: 20 pages; 11 figures; accepted for publication in A&A
The algebraic and geometric classification of nilpotent anticommutative algebras
Creators: name: Kaygorodov, Ivan
name: Khrypchenko, Mykola
name: Lopes, Samuel A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: We give algebraic and geometric classifications of $6$-dimensional complex nilpotent anticommutative algebras. Specifically, we find that, up to isomorphism, there are $14$ one-parameter families of $6$-dimensional nilpotent anticommutative algebras, complemented by $130$ additional isomorphism classes. The corresponding geometric variety is irreducible and determined by the Zariski closure of a one-parameter family of algebras. In particular, there are no rigid $6$-dimensional complex nilpotent anticommutative algebras.
description: arXiv admin note: text overlap with arXiv:1905.05361; text overlap with arXiv:1912.02691 by other authors
Distances, Metallicities, and Ages of Dwarf Elliptical Galaxies in the Virgo Cluster from Surface Brightness Fluctuations
Creators: name: Jerjen, H.
name: Binggeli, Bruno
name: Barazza, Fabio D.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have employed FORS1/2+VLT to acquire deep B and R CCD images of 16 dwarf elliptical galaxies in the direction of the Virgo cluster. For each dwarf we measure the R-band surface brightness fluctuation (SBF) magnitude \bar{m}_R and the (B-R) colour in a number of fields at different galactocentric distances. From the field-to-field variation of the two quantities we determine the SBF distance by means of the (B-R)-\bar{M}_R relation. The derived distances of the dwarfs are ranging from 14.9-21.3Mpc, with a mean 1sigma uncertainty of 1.4Mpc, confirming that there is considerable depth in the distance distribution of early-type cluster members. For IC3388 our SBF distance of 17.0+-1.5Mpc is in good agreement with the Harris et al. result based on HST observations and the tip magnitude of the red giant branch. Combining our results with existing distances for giant Virgo ellipticals we identify two major galaxy concentrations: a broad primary clump around 15.8Mpc and a narrow secondary clump around 18.5Mpc. An adaptive kernel analysis finds the two concentrations to be significant at the 99% and 89% levels. While the near-side clump of Virgo early-type galaxies can be associated to the subcluster centered on M87, the second clump is believed to be mainly due to the backside infalling group of galaxies around M86. The ages and metallicities of the dE stellar populations are estimated by combining the observed (B-R) colours with Worthey's stellar population synthesis models. It appears that the Virgo dEs cover a wider range in metallicity than Fornax cluster dEs. The derived metallicities place the Virgo dEs on the extension of the [Fe/H]-M_V relation defined by the Local Group dEs. The data further suggest an age range from genuinly old stellar systems like IC3019 to intermediate-age dwarfs like NGC4431.
description: Accepted for publication in AJ, 27 pages, 10 figures, 8 tables
A Comprehensive and Modularized Statistical Framework for Gradient Norm Equality in Deep Neural Networks
Creators: name: Chen, Zhaodong
name: Deng, Lei
name: Wang, Bangyan
name: Li, Guoqi
name: Xie, Yuan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: In recent years, plenty of metrics have been proposed to identify networks that are free of gradient explosion and vanishing. However, due to the diversity of network components and complex serial-parallel hybrid connections in modern DNNs, the evaluation of existing metrics usually requires strong assumptions, complex statistical analysis, or has limited application fields, which constraints their spread in the community. In this paper, inspired by the Gradient Norm Equality and dynamical isometry, we first propose a novel metric called Block Dynamical Isometry, which measures the change of gradient norm in individual block. Because our Block Dynamical Isometry is norm-based, its evaluation needs weaker assumptions compared with the original dynamical isometry. To mitigate the challenging derivation, we propose a highly modularized statistical framework based on free probability. Our framework includes several key theorems to handle complex serial-parallel hybrid connections and a library to cover the diversity of network components. Besides, several sufficient prerequisites are provided. Powered by our metric and framework, we analyze extensive initialization, normalization, and network structures. We find that Gradient Norm Equality is a universal philosophy behind them. Then, we improve some existing methods based on our analysis, including an activation function selection strategy for initialization techniques, a new configuration for weight normalization, and a depth-aware way to derive coefficients in SeLU. Moreover, we propose a novel normalization technique named second moment normalization, which is theoretically 30% faster than batch normalization without accuracy loss. Last but not least, our conclusions and methods are evidenced by extensive experiments on multiple models over CIFAR10 and ImageNet.
description: Under review as a regular paper in TPAMI
A leitura pública em Portugal - Manifesto
Creators: name: Branco, Alberto
name: Cabral, Luís
name: Cruz, Helena Braga
name: Fernandes, João Teixeira
name: Flores, Alexandre Magno
name: Guerreiro, Augusto D.
name: Mesquita, Mariana
name: Nunes, Henrique Barreto
name: Palma, Amélia Mana
name: Patrício, Maria Carmo
name: Portilheiro, Joaquim
name: Revez, Idálio
name: Silva, Matos
name: Sottomayor, José
name: Sousa, José Motta
name: Trindade, Francisca
name: Portugal, Rui
name: Lobo, Mata
Publisher: name: Cadernos BAD
Year: 2003

description: Cadernos BAD, N.º 1 (1983)
The Cellular Burning Regime in Type Ia Supernova Explosions - II. Flame Propagation into Vortical Fuel
Creators: name: Roepke, F. K.
name: Hillebrandt, W.
name: Niemeyer, J. C.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the interaction of thermonuclear flames in Type Ia supernova explosions with vortical flows by means of numerical simulations. In our study, we focus on small scales, where the flame propagation is no longer dominated by the turbulent cascade originating from large-scale effects. Here, the flame propagation proceeds in the cellular burning regime, resulting from a balance between the Landau-Darrieus instability and its nonlinear stabilization. The interaction of a cellularly stabilized flame front with a vortical fuel flow is explored applying a variety of fuel densities and strengths of the velocity fluctuations. We find that the vortical flow can break up the cellular flame structure if it is sufficiently strong. In this case the flame structure adapts to the imprinted flow field. The transition from the cellularly stabilized front to the flame structure dominated by vortices of the flow proceeds in a smooth way. The implications of the results of our simulations for Type Ia Supernova explosion models are discussed.
description: 13 pages, 2 tables, 10 figures, resolution of Figs. 4 and 5 degraded due to archive file size restrictions, submitted to A&A
Subsídios para a história de Cadernos de biblioteconomia, arquivística e documentação
Creators: name: Faria, Maria Graça
name: Paiva, Margarida
name: Godinho, Matos
name: Faria, Isabel
Publisher: name: Cadernos BAD
Year: 2003

description: Cadernos BAD, N.º 1 (1983)
Optimum Phosphorus Fertilization
Creators: name: Forster, D. Lynn
name: Forster, D. Lynn
Publisher: name: Unknown
Year: 1985
Subjects: Demand and Price Analysis
Environmental Economics and Policy

description: A model is developed relating economic phosphorus fertilizer application rates to soil phosphorus content and crop and phosphate prices. Optimum rates are relatively low for soils with moderate to high phosphorus content. For most Corn Belt soils, phosphate fertilizer demand is price elastic.
A formação profissional dos bibliotecários alemães (alemanhã ocidental)
Creators: name: Lopes, Rosalina Pereira
Publisher: name: Cadernos BAD
Year: 2003

description: Refere-se a traços largos o sistema de preparação profissional dos bibliotecários da República Federal Alemã, enquadrados em dois niveis de actividade na hierarquia dos serviços das bibliotecas, niveis que correspondem a dois graus distintos de formação, ou seja ao curso bibliotecário superior e ao curso bibliotecário médio.
description: Cadernos BAD, N.º 1 (1966)