cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Neuroscienze, psicoanalisi e pedagogia: quale rapporto?
Creators: name: Fratini, Carlo
Publisher: name: Studi sulla Formazione
Year: 2011

description: The article highlights the complex relationships between education, psychoanalysis and neuroscience in order to social and cultural changes and rapid development of neuroscience in a few last years. Special attention was paid to internal working models of attachment, imitative learning processes related to mirror neurons and procedural processes related to implicit memory, which however do not explain the value and meaning of subjective experience of living. Finally it is emphasized the importance of human education in order to achieve human freedom and social emancipation.
description: Studi sulla Formazione, Anno XIV, I-2011
title: Least-Change Secant Updates of Non-Square Matrices
Creators: name: Bourji, Samih Kassem
Publisher: name: Utah State University
Year: 1987

description: In many problems involving the solution of a system of nonlinear equations, it is necessary to keep an approximation to the Jacobian matrix which is updated at each iteration. Computational experience indicates that the best updates are those that minimize some reasonable measure of the change to the current Jacobian approximation subject to the new approximation obeying a secant condition and perhaps some other approximation properties such as symmetry.
All of the updates obtained thus far deal with updating an approximation to an nxn Jacobian matrix. In this thesis we consider extending most of the popular updates to the non-square case. Two applications are immediate: between-step updating of the approximate Jacobian of f(X,t) in a non-autonomous ODE system, and solving nonlinear systems of equations which depend on a parameter, such as occur in continuation methods. Both of these cases require extending the present updates to include the nx(n+l) Jacobian matrix, which is the issue we address here. Our approach is to stay with the least change secant formulation. Computational results for these new updates are also presented to illustrate their convergence behavior.
Spontaneous Fermi surface symmetry breaking in bilayered systems
Creators: name: Yamase, Hiroyuki
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We perform a comprehensive numerical study of d-wave Fermi surface deformations (dFSD) on a square lattice, the so-called d-wave Pomeranchuk instability, including bilayer coupling. Since the order parameter corresponding to the dFSD has Ising symmetry, there are two stacking patterns between the layeres, (+,+) and (+,-). This additional degree of freedom gives rise to a rich variety of phase diagrams. The phase diagrams are classified by means of the energy scale Lambda_{z}, which is defined as the bilayer splitting at the saddle points of the in-plane band dispersion. As long as Lambda_{z} ne 0, a major stacking pattern is usually (+,-), and (+,+) stacking is stabilized as a dominant pattern only when the temperature scale of the dFSD instability becomes much smaller than Lambda_z. For Lambda_{z}=0, the phase diagram depends on the precise form of the bilayer dispersion. We also analyze the effect of a magnetic field on the bilayer model in connection with a possible dFSD instability in the bilyared ruthenate Sr_3Ru_2O_7.
description: 18 pages, 7 figures
Anderson localization for a supersymmetric sigma model
Creators: name: Disertori, Margherita
name: Spencer, Tom
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study a lattice sigma model which is expected to reflect the Anderson localization and delocalization transition for real symmetric band matrices in 3D. In this statistical mechanics model, the field takes values in a supermanifold based on the hyperbolic plane. The existence of a diffusive phase in 3 dimensions was proved for low temperatures. Here we prove localization at high temperatures for any dimension $d\geq 1$. Our analysis uses Ward identities coming from internal supersymmetry.
title: Linear Regression of the Poisson Mean
Creators: name: Brown, Duane Steven
Publisher: name: Utah State University
Year: 1982

description: The purpose of this thesis was to compare two estimation procedures, the method of least squares and the method of maximum likelihood, on sample data obtained from a Poisson distribution. Point estimates of the slope and intercept of the regression line and point estimates of the mean squared error for both the slope and intercept were obtained. It is shown that least squares, the preferred method due to its simplicity, does yield results as good as maximum likelihood.
Also, confidence intervals were computed by Monte Carlo techniques and then were tested for accuracy. For the method of least squares, confidence bands for the regression line were computed under two different assumptions concerning the variance. It is shown that the assumption of constant variance produces false confidence bands. However, the assumption of the variance equal to the mean yielded accurate results.
title: Explanation of the Fast Fourier Transform and Some Applications
Creators: name: Endo, Alan Kazuo
Publisher: name: Utah State University
Year: 1981

description: This report describes the Fast Fourier Transform and so~ of its applications. It describes the continuous Fourier transform and some of its properties. Finally, it describes the Fast Fourier Transform and its applications to hurricane risk analysis, ocean wave analysis, and hydrology.
title: Full Scale Experimental Testing of Partially Composite Precast Concrete Sandwich Panels
Creators: name: Cox, Brandon L.
Publisher: name: Utah State University
Year: 2018

description: Precast concrete sandwich panels are a structural system consisting of concrete layers with insulation layers in between. The concrete layers are connected through the insulation with specially designed connectors. For engineers to properly design and analyze the strength characteristics of sandwich panels and their connectors, the engineers need to obtain recommendations from the individual connector manufacturers, which can be a very rigorous process. This project tested eight full scale precast concrete sandwich panels with two concrete layers on either side of an insulation layer with connectors concentrated at either end of each panel. The objectives of this project were to evaluate the interaction between the two concrete layers and how well the connectors transferred forces between the layers (percent of composite action) and to validate simplified methods of predicting properties of the panels by comparing the predicted panel properties to the results of the testing series. Additionally, this study evaluated the panel’s different thicknesses and lengths and compared their results.
Integrability of Lie systems and some of its applications in physics
Creators: name: Cariñena, José F.
name: de Lucas, Javier
name: Rañada, Manuel F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 70H05; 22E60

description: The geometric theory of Lie systems will be used to establish integrability conditions for several systems of differential equations, in particular Riccati equations and Ermakov systems. Many different integrability criteria in the literature will be analyzed from this new perspective and some applications in physics will be given.
description: 16 pages
Effects of forcing mechanisms on the multiscale properties of magnetohydrodynamics
Creators: name: Yang, Yan
name: Linkmann, Moritz
name: Biferale, Luca
name: Wan, Minping
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: We performed numerical simulations to study the response of magnetohydrodynamics (MHD) to large-scale stochastic forcing mechanisms parametrized by one parameter, $0 \le a \le1$, going from direct injection on the velocity field ($a = 1$) to stirring acts on the magnetic field only ($a = 0$). We study the multi-scale properties of the energy transfer, by splitting the total flux in channels mediated by (i) the kinetic non-linear advection, (ii) the Lorentz force, (iii) the magnetic advection and (iv) magnetic stretching term. We further decompose the fluxes in two sub-channels given by heterochiral and homochiral components in order to distinguish forward, inverse and flux-loop cascades. We show that there exists a quasi-singular role of the magnetic forcing mechanism for $a \sim 1$: a small injection on the magnetic field $a < 1$ can strongly deplete the mean flux of kinetic energy transfer throughout the kinetic non-linear advection channel. We also show that this negligible mean flux is the result of a flux-loop balance between heterochiral (direct) and homochiral (inverse) transfers. Conversely, both homochiral and heterochiral channels transfer energy forward for the other three channels. Cross exchange between velocity and the magnetic field is reversed around $a = 0.4$ and except when $a \sim 1$ we always observe that heterochiral mixed velocity-magnetic energy triads tend to move energy from magnetic to velocity fields. Our study is an attempt to further characterize the multi-scale nature of MHD dynamics, by disentangling different properties of the total energy transfer mechanisms, which can be useful for improving sub-grid-modelling.
title: A Qualitative Analysis Exploring the Development of Problematic Sexual Behaviors in Adolescent Males with Developmental Disabilities
Creators: name: Watters, Maria J.
Publisher: name: Utah State University
Year: 2018

description: Adolescents with developmental disabilities (DD) experience regular physical and sexual development. Some adolescents with developmental disabilities engage in problematic sexual behaviors (PSB). In order to be able to address the needs of this population in terms of prevention of PSB, and provision of effective treatment after PSB has begun, their experience must be understood and contributing factors identified. It is with this in mind that this study was designed, with the purpose being the exploration of the experiences of adolescents with DD who have engaged in sexually problematic behaviors, including compulsive or addictive patterns of behavior, and to identify the contributing factors for engaging in these behaviors. A grounded theory approach with a directed analysis component was used. Eleven participants were interviewed including five persons with developmental disabilities (PWDD) and six parents regarding the experiences of seven different individuals with DD who have engaged in PSB. Results of this study indicate that the presence of a DD increases the complexity of this experience. A model was created to explain the overall process of engaging in PSB as requiring exposure, motivation, opportunity, and deficits in sexual education. In addition, nine different factors were identified that may be contributing factors that increase the risk of an individual with DD engaging in PSB. These results may be of value for parents of children with DD, service providers, and educators.
Additional file 9 of Identification of priority pathogens for aetiological diagnosis in adults with community-acquired pneumonia in China: a multicentre prospective study
Creators: name: Zhang, Lulu
name: Xiao, Yan
name: Zhang, Guoliang
name: Li, Hongru
name: Zhao, Jianping
name: Chen, Mingwei
name: Chen, Fuhui
name: Liu, Ling
name: Li, Yalun
name: Peng, Liping
name: Zhao, Feng
name: Yang, Donghong
name: Wen, Zhongmei
name: Wu, Lei
name: Wu, Shuo
name: Sun, Yajiao
name: Wang, Ying
name: Chen, Lan
name: Wang, Xinming
name: Wang, Lihui
name: Li, Weimin
name: Qiu, Haibo
name: Chen, Yusheng
name: Gao, Zhancheng
name: Ren, Lili
name: Wang, Jianwei
Publisher: name: figshare
Year: 2023
Subjects: subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Virology
subject: Computational Biology

description: Supplementary Material 9
Unambiguous probe of parity-mixing of Cooper pairs in noncentrosymmetric superconductors
Creators: name: Fujimoto, Satoshi
Publisher: name: arXiv
Year: 2009
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose an experimental scheme to detect unambiguously parity-mxing of Cooper pairs in noncentrosymmetric superconductors, which utilizes crossed Andreev reflection processes between two oppositely spin-polarized normal metal leads and a noncentrosymmetric superconductor. It is demonstrated that a non-local conductance exhibits a clear signature of parity breaking of Cooper pairs, and thus, can be a direct probe for the parity-mixing.
description: 4 pages, 2figures
title: Evaluation of a Side-By-Side Full-Scale Biofiltration Conversion in a Nutrient-Limited Environment
Creators: name: Bassett, Stetson S.
Publisher: name: Utah State University
Year: 2018

description: In order to meet increasing water demands and more stringent regulations drinking water treatment plant managers must continually look to new treatment strategies and optimization techniques. One such strategy is to eliminate chlorine residual before filtration, allowing indigenous bacteria already present in the source water to grow on the filter media. These microorganisms help improve effluent water quality by increasing organic and inorganic contaminant removal. The process is known as biological filtration, or biofiltration. The implications of converting a conventional filtration plant (not specifically designed for biofiltration) to a biofiltration plant are still not well understood. Therefore, the purpose of this study was to evaluate water quality and operational trends of a side-by-side full-scale biofiltration conversion at the Quail Creek Water Treatment Plant (QCWTP), located in Hurricane, Utah, and to determine the impact of pre-chlorination elimination on filter performance.
Four of twelve filters at the QCWTP were used to test the plant’s ability to operate in biological mode. One acted as a control and ran similar to the other eight filters in the treatment plant. The other three were converted to biofilters by quenching the influent chlorine residual with thiosulfate. The experiment lasted one year, so filter performance could be evaluated in each season. The results from the study indicated that the influent water was low in organic carbon (i.e. food for microorganisms), which resulted in small differences in biological activity between filters. Disinfection by-products (DBPs) (i.e. cancer causing agents created from the combination of chlorine and organic matter) were lower in the biofilters relative to the control. Biological conversion resulted in slightly higher and more variable final effluent turbidity values (though still within EPA drinking water standards and operational goals) compared to the non-biological filters; however, filter run times were unaffected.
The evolving distribution of hard partons traversing a hot strongly interacting plasma
Creators: name: Schenke, Bjoern
name: Gale, Charles
name: Qin, Guang-You
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present results for the evolution of the momentum distribution of a hard parton traversing a brick of quark-gluon plasma, considering both bremsstrahlung and collisional energy loss. The complete leading order transition rates are included. We find a significant modification of the evolving momentum distribution compared to results obtained by employing an approximate implementation of the collisional energy loss that uses the mean energy loss, together with momentum diffusion.
description: 7 pages, 9 figures, references updated and added
Los proyectos de trabajo como estrategia de investigación-acción en la formación docente
Creators: name: Mérida, Rosario
name: González Alfaya, Serrano Elena
name: García, Ángeles Olivares
Publisher: name: Studi sulla Formazione
Year: 2012

description: In the following paper we will present a teaching innovation experience called RIECU (Spanish acronym for Network of Childhood Education: school - continuing education - university). This experience aims to build bridges between the initial and the lifelong learning, the theory and the practice, and the school and the University, through collaborative work and using the Work Projects as conductive thread. We will also show what the university students’ perception was of the increase in their acquisition of professional skills after participating in this experience.
description: Studi sulla Formazione, Anno XV, I-2012
Electron and Muon $g-2$ Contributions from the $T'$ Higgs Sector
Creators: name: Ho, Chiu Man
name: Kephart, Thomas W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the experimental constraints from electron and muon $g-2$ factors on the Higgs masses and Yukawa couplings in the $T'$ model, and thereby show that the discrepancy between the standard model prediction and experimental value of muon anomalous $g-2$ factor can be easily accommodated.
description: 7 pages, slightly modified and new references added
title: Vector Optimization Decision Convergence Algorithm (VODCA)
Creators: name: Morgan, Thomas Ward
Publisher: name: Utah State University
Year: 1980

description: Many professions occasionally involve the selection of an alternative from among many problem solutions which have impacts in multiple-interest areas; however, due to the very nature of his work, the practicing engineer, regardless of specialty, is unavoidably engaged in this selection process. The emergence of national concern for environmental and social consequences of technical enterprises, as reflected through legislative action, has accentuated the need for multicriteria design methodologies in some areas of engineering (i.e., automotive). Consequently, interest in the development of pragmatic and theoretically sound approaches to multi-impact design situations has been keen. Any approach to multicriteria design/decision problems involves two fundamental aspects: (1) generating information regarding the range of possible designs and their associated impacts; and (2) generating relative value information which is used to compare the relative imp-cats leading to the selection of a "preferred" or "best compromise" alternative. The methodology developed herein is the integration of a formal mathematical programming technique for generating the full range of feasible alternatives with a pragmatic and well-accepted group-interaction technique for extracting value information regarding alternatives. The integration results in an iterative group-interaction process which leads to successive reductions in the preferred range of alternatives until the most preferred alternative is identified.
The methodology developed in this research represents an improvement over other methodologies reported in the literature in two areas: 1) The noninferior set is explicitly identified insuring selection of a group decision point which is noninferior, 2) a least squared error mathematical filtering technique is developed for smoothing relative value data obtained from the decision making body. In addition, a convergence proof is developed which not only indicates the theoretically sound and robust nature of the algorithm developed in this work but in addition provides a basis for an improved class of algorithms for solving classical nonlinear constrained problems. The technique was developed for and implemented in an interactive software package. The multiobjective decision problem is solved in a single encounter with a cooperative decision making group.
Interculturalità, quando? Brevi note per una metodologia interculturale
Creators: name: Giustino Vitolo, Angela
Publisher: name: Studi sulla Formazione
Year: 2013

description: Interculture is a task and a challenge of our time. A task of hybridization of cultures. A challenge to autonomy of culture, to build a more plural and more open community. This task and this challenge require, in the educative relationship, a more explicitly “Socratic” process.
description: Studi sulla Formazione, Anno XV, II-2012
Finite-Temperature Mott Transition in Two-Dimensional Frustrated Hubbard Models
Creators: name: Ohashi, Takuma
name: Momoi, Tsutomu
name: Tsunetsugu, Hirokazu
name: Kawakami, Norio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the Hubbard model on two typical frustrated lattices in two dimensions, the kagome lattice and the anisotropic triangular lattice, by means of the cellular dynamical mean field theory. We show that the metallic phase is stabilized up to fairly large Hubbard interactions under strong geometrical frustration in both cases, which results in heavy fermion behavior and several anomalous properties around the Mott transition point. In particular, for the anisotropic triangular lattice, we find novel reentrant behavior in the Mott transition in the moderately frustrated parameter regime, which is caused by the competition between Fermi-liquid formation and magnetic correlations. It is demonstrated that the reentrant behavior is a generic feature inherent in the Mott transition with intermediate geometrical frustration, and indeed in accordance with recent experimental findings for organic materials.
description: 20 pages, 19 figures, to be published in the proceedings of YKIS2007 conference as a special issue of Prog. Theor. Phys. Suppl
Dileptons from the strongly-interacting Quark-Gluon Plasma within the Parton-Hadron-String-Dynamics (PHSD) approach
Creators: name: Linnyk, O.
name: Bratkovskaya, E. L.
name: Cassing, W.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Dilepton production in In+In collisions at 158 AGeV is studied within the microscopic Parton-Hadron-Strings Dynamics (PHSD) transport approach, which is based on a dynamical quasiparticle model (DQPM) matched to reproduce lattice QCD results in thermodynamic equilibrium. A comparison to the data of the NA60 Collaboration shows that the low mass dilepton spectra are well described by including a collisional broadening of vector mesons, while the spectra in the intermediate mass range are dominated by off-shell quark-antiquark annihilation in the nonperturbative QGP. In particular, the observed softening of the mT spectra at intermediate masses is reproduced.
description: talk given at the 21st International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter 2009), to be published in Nucl.Phys.A, 4 pages, 3 figures, elsarticle style
title: Linear Operators Strongly Preserving Polynomial Equations Over Antinegative Semirings
Creators: name: Lee, Sang-Gu
Publisher: name: Utah State University
Year: 1991

description: We characterized the group of linear operators that strongly preserve r-potent matrices over the binary Boolean semiring, nonbinary Boolean semirings, and zero-divisor free antinegative semirings. We extended these results to show that linear operators that strongly preserve r-potent matrices are equivalent to those linear operators that strongly preserve the matrix polynomial equation p(X) = X. where p(X) = Xr1 + Xr2 + ... + Xrt and r1>r2>...>rt≥2.
In addition, we characterized the group of linear operators that strongly preserve r-cyclic matrices over the same semirings. We also extended these results to linear operators that strongly preserve the matrix polynomial equation p(X) = I where p(X) is as above.
Chapters I and II of this thesis contain background material and summaries of the work done by other researchers on the linear preserver problem. Characterizations of linear operators in chapters III, IV, V, and VI of this thesis are new.
A q-spin Potts model of markets: Gain-loss asymmetry in stock indices as an emergent phenomenon
Creators: name: Bornholdt, Stefan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Theoretical Economics (econ.TH)
subject: Statistical Finance (q-fin.ST)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: Spin models of markets inspired by physics models of magnetism, as the Ising model, allow for the study of the collective dynamics of interacting agents in a market. The number of possible states has been mostly limited to two (buy or sell) or three options. However, herding effects of competing stocks and the collective dynamics of a whole market may escape our reach in the simplest models. Here I study a q-spin Potts model version of a simple Ising market model to represent the dynamics of a stock market index in a spin model. As a result, a self-organized gain-loss asymmetry in the time series of an index variable composed of stocks in this market is observed.
description: 14 pages, 3 figures
Dibattere a scuola: scegliere il proprio percorso educativo
Creators: name: De Conti, Manuele
Publisher: name: Studi sulla Formazione
Year: 2013

description: Using debate as an effective educational tool means choosing a suitable debate format for accomplishing the pedagogical aims we have in mind. Thus, the aim of this paper is to understand how each debate format relates to the competen- cies it promotes. It is only through knowing how competencies are stimulated by specific rules of debate formats that we are able to make a reasoned and ef- fective choice.
description: Studi sulla Formazione, Anno XVI, I-2013
Il Rousseau di Antoni
Creators: name: Mattei, Francesco
Publisher: name: Studi sulla Formazione
Year: 2013

description: Carlo Antoni belongs to the crowded and well-known rank of Croce’s followers. While continuing to be grateful to Croce, he starts distancing himself from him in his Commentary to Croce (1955). He thus engages himself in the neo-Natural Law path and forges his own liberal-democratic conception of the society and of the State. Making the curtain between ethics and politics permeable, he tries to draw together, in a dialectical way, these two moments. In this light he reads Rousseau and his concept of “General Will”. The Geneva philosopher seems to him a strong link in the theoretical chain of “Ethical state”, starting from Hobbes and, through Fichte and Hegel, progressing to Gentile. Antoni’s position was not deemed noteworthy by the majority of post-gentilian disciples, but also by the large crowd of the intellectuals once faithful to Actualism and, later on, enthousiast Marxist converts.
description: Studi sulla Formazione, Anno XVI, I-2013
title: Maximal Rank-One Spaces of Matrices Over Chain Semirings
Creators: name: Scully, Daniel Joseph
Publisher: name: Utah State University
Year: 1988

description: Vectors and matrices over the Boolean (0,1) semiring have been studied extensively along with their applications to graph theory. The Boolean (0,1) semiring has been generalized to a class of semirings called chain semirings. This class includes the fuzzy interval. Vectors and matrices over chain semirings are examined. Rank-1 sets of vectors are defined and characterized. These rank-1 sets of vectors are then used to construct spaces of matrices (rank-1 spaces) with the property that all nonzero matrices in the space have semiring rank equal to 1. Finally, three classes of maximal (relative to containment) rank-1 spaces are identified.
Accurate estimation of third-order moments from turbulence measurements
Creators: name: Podesta, J. J.
name: Forman, M. A.
name: Smith, C. W.
name: Elton, D. C.
name: Malecot, Y.
name: Gagne, Y.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Politano and Pouquet's law, a generalization of Kolmogorov's four-fifths law to incompressible MHD, makes it possible to measure the energy cascade rate in incompressible MHD turbulence by means of third-order moments. In hydrodynamics, accurate measurement of third-order moments requires large amounts of data because the probability distributions of velocity-differences are nearly symmetric and the third-order moments are relatively small. Measurements of the energy cascade rate in solar wind turbulence have recently been performed for the first time, but without careful consideration of the accuracy or statistical uncertainty of the required third-order moments. This paper investigates the statistical convergence of third-order moments as a function of the sample size N. It is shown that the accuracy of the third-moment depends on the number of correlation lengths spanned by the data set and a method of estimating the statistical uncertainty of the third-moment is developed. The technique is illustrated using both wind tunnel data and solar wind data.
description: Submitted to: Nonlinear Processes in Geophysics
Multibeam SETI Observations toward Nearby M dwarfs with FAST
Creators: name: Luan, Xiao-Hang
name: Huang, Bo-Lun
name: Tao, Zhen-Zhao
name: Cui, Yan
name: Zhang, Tong-Jie
name: Wang, Pei
Publisher: name: arXiv
Year: 2025
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The search for extraterrestrial intelligence (SETI) targeted searches aim to observe specific areas and objects to find possible technosignatures. Many SETI researches have focused on nearby stars and their planets in recent years. In this paper, we report a targeted SETI observations using the most sensitive L-band Five-hundred-meter Aperture Spherical radio Telescope (FAST) toward three nearby M dwarfs, all of which have been discovered exoplanet candidates. The minimum equivalent isotropic radiant power of the lower limit from the three sources we can detect is $6.19 \times 10^{8}$ W, which is well within the reach of current human technology. Applying the multibeam coincidence matching (MBCM) blind search mode, we search for narrowband drifting signals across 1.05-1.45 GHz in each of the two orthogonal linear polarization directions. An unusual signal at 1312.50 MHz detected from the observation toward AD Leo originally piqued our interest. However, we finally eliminate the possibility of an extraterrestrial origin based on much evidence, such as the polarization, frequency, and beam coverage characteristics.
description: 13 pages, 2 tables, 8 figures, accepted for publication in AJ
Some aspects of three and four-body dynamics
Creators: name: Barkham, Peter George Douglas
Publisher: name: University of British Columbia
Year: 2010

description: Two fundamental problems of celestial mechanics are considered: the stellar or planetary three-body problem and a related form of the restricted four-body problem. Although a number of constraints are imposed, no assumptions are made which could invalidate the final solution. A consistent and rational approach to the analysis of four-body systems has not previously been developed, and an attempt is made here to describe problem evolution in a systematic manner. In the particular three-body problem under consideration two masses, forming a close binary system, orbit a comparatively distant mass. A new literal, periodic solution of this problem is found in terms of a small parameter e, which is related to the distance separating the binary system and the remaining mass, using the two variable expansion procedure. The solution is accurate within a constant error O(e¹¹) and uniformly valid as e tends to zero for time intervals 0(e¹⁴). Two specific examples are chosen to verify the literal solution, one of which relates to the sun-earth-moon configuration of the solar system. The second example applies to a problem of stellar motion where the three masses are in the ratio 20 : 1 : 1. In both cases a comparison of the analytical solution with an equivalent numerically-generated orbit shows .close agreement, with an error below 5 percent for the sun-earth-moon configuration and less than 3 percent for the stellar system. The four-body problem is derived from the three-body case by introducing a particle of negligible mass into the close binary system. Unique uniformly valid solutions are found for motion near both equilateral triangle points of the binary system in terms of the small parameter e, where the primaries move in accordance with the uniformly-valid three-body solution. Accuracy, in this case, is Q maintained within a constant error 0(e⁸), and the solutions are uniformly valid as e tends to zero for time intervals 0(e¹¹). Orbital position errors near L₄ and L₅ of the earth-moon system are found to be less than 5 percent when numerically-generated periodic solutions are used as a standard of comparison. The approach described here should, in general, be useful in the analysis of non-integrable dynamic systems, particularly when it is feasible to decompose the problem into a number of subsidiary cases.
JWST + ALMA ubiquitously discover companion systems within $\lesssim18\,$kpc around four $z$$\approx$3.5 luminous radio-loud AGN
Creators: name: Wang, Wuji
name: De Breuck, Carlos
name: Wylezalek, Dominika
name: Vernet, Joël
name: Lehnert, Matthew D.
name: Stern, Daniel
name: Rupke, David S. N.
name: Nesvadba, Nicole P. H.
name: Vayner, Andrey
name: Zakamska, Nadia L.
name: Lin, Lingrui
name: Kukreti, Pranav
name: de Oliveira, Bruno Dall'Agnol
name: Groth, Julian T.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Mergers play important roles in galaxy evolution at and beyond Cosmic Noon ($z\sim3$). They are found to be a trigger of active galactic nuclei (AGN) activity and a process for growing stellar mass and black hole mass. High-$z$ radio galaxies (HzRGs=type-2 radio-loud AGN) are among the most massive galaxies known, and reside in dense environments on scales of tens of kiloparsecs to Megaparsecs. We present the first search for kpc-scale companions in a sample of four $z\sim3.5$ HzRGs, with many supporting datasets, using matched 0.2" resolution ALMA and JWST/NIRSpec integral field unit data. We discover a total of $\sim12$ companion systems within $\lesssim18\,$kpc across all four HzRG fields using two independent detection methods: peculiar [OIII]$4959,5007$ kinematics offset from the main (systemic) ionized gas component and [CII]$158\rm μm$ emitters. We examine the velocity fields of these companions and find evidence of disk rotation along with more complex motions. We estimate the dynamical masses of these nearby systems to be $M_{\rm dyn}\sim10^{9-11}\,M_{\odot}$, which may indicate a minor merger scenario. Our results indicate that these companions may be the trigger of the powerful radio-loud AGN. We discuss the roles of the discovered companion systems in galaxy evolution for these powerful jetted AGN and indicate that they may impede jet launch and deflect the jet.
description: Accepted for publication in Astronomy & Astrophysics, 16 pages, 12 figures, and 2 tables in main text; also cool figures in appendix
Principali criticità della pedagogia e della didattica dell’emergenza
Creators: name: Isidori, Maria Vittoria
Publisher: name: Studi sulla Formazione
Year: 2011

description: The author, at the beginning of the essay, presents the specific area of research which is dealing with: a didactics dedicated to educational emergencies. Here are some keywords: humanitarian assistance, disaster, marginalization, spatial and temporal exclusion, extraordinary daily life, etc. We must build a kind of emotional and cognitive habitus to organize our lives in relation to otherness and difference and pedagogy may be a useful tool for the elaboration of experience and of error and to build educational relationships focused on the plurality.
description: Studi sulla Formazione, Anno XIII, I-2010
Temperature dependence of circular DNA topological states
Creators: name: Chen, Hu
name: Liu, Yanhui
name: Zhou, Zhen
name: Hu, Lin
name: Ou-Yang, Zhong-Can
name: Yan, Jie
Publisher: name: arXiv
Year: 2009
Subjects: subject: Biomolecules (q-bio.BM)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: Circular double stranded DNA has different topological states which are defined by their linking numbers. Equilibrium distribution of linking numbers can be obtained by closing a linear DNA into a circle by ligase. Using Monte Carlo simulation, we predict the temperature dependence of the linking number distribution of small circular DNAs. Our predictions are based on flexible defect excitations resulted from local melting or unstacking of DNA base pairs. We found that the reduced bending rigidity alone can lead to measurable changes of the variance of linking number distribution of short circular DNAs. If the defect is accompanied by local unwinding, the effect becomes much more prominent. The predictions can be easily investigated in experiments, providing a new method to study the micromechanics of sharply bent DNAs and the thermal stability of specific DNA sequences. Furthermore, the predictions are directly applicable to the studies of binding of DNA distorting proteins that can locally reduce DNA rigidity, form DNA kinks, or introduce local unwinding.
description: 15 pages in preprint format, 4 figures
title: Comparison of Bootstrap with Other Tests for Several Distributions
Creators: name: Wong, Yu-Yu
Publisher: name: Utah State University
Year: 1988

description: This paper discusses results of a computer simulation to investigate several different tests when sampling several distributions. The hypothesis H0: μ=0 was tested against H0: μ≠0, using the usual t-test, trimmed t-test, the Jackkinfe, the Boostrap and signed-rank test. The p-values and empirical power show that the Bootstrap is as good as the t-test. The Jackknife procedure is too liberal, always obtaining small p-values. The signed-rank is a fairly good test if the data follows the Cauchy Distribution.
CMB polarization map derived from the WMAP 5 year data through Harmonic Internal Linear Combination
Creators: name: Kim, Jaiseung
name: Naselsky, Pavel
name: Christensen, Per Rex
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have derived whole-sky CMB polarization maps from the WMAP 5 year polarization data, using the Harmonic Internal Linear Combination (HILC) method. Our HILC method incorporates spatial variability of linear weights in a natural way and yields continuous linear weights over the entire sky. To estimate the power spectrum of HILC maps, we have derived a unbiased quadratic estimator, which is similar to the WMAP team's cross power estimator, but in a more convenient form for HILC maps. From our CMB polarization map, we have obtained TE correlation and E mode power spectra without applying any mask. They are similar to the WMAP team's estimation and consistent with the WMAP best-fit $Λ$CDM model. Foreground reduction by HILC method is more effective for high resolution and low noise data. Hence, our HILC method will enable effective foreground reduction in polarization data from the Planck surveyor.
description: The whole sky CMB polarization map derived from the WMAP 5 year data is available in the HEALPix FITS format at http://www.nbi.dk/~jkim/hilc v3: matched with the accepted version, to appear in PRD. v4: fixed some pdf file problem
Changing-look event in NGC 3516: continuum or obscuration variability?
Creators: name: Mehdipour, Missagh
name: Kriss, Gerard A.
name: Brenneman, Laura W.
name: Costantini, Elisa
name: Kaastra, Jelle S.
name: Branduardi-Raymont, Graziella
name: Di Gesu, Laura
name: Ebrero, Jacobo
name: Mao, Junjie
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Seyfert-1 galaxy NGC 3516 has undergone major spectral changes in recent years. In 2017 we obtained Chandra, NuSTAR, and Swift observations during its new low-flux state. Using these observations we model the spectral energy distribution (SED) and the intrinsic X-ray absorption, and compare the results with those from historical observations taken in 2006. We thereby investigate the effects of the changing-look phenomenon on the accretion-powered radiation and the ionized outflows. Compared to its normal high-flux state in 2006, the intrinsic bolometric luminosity of NGC 3516 was lower by a factor of 4 to 8 during 2017. Our SED modeling shows a significant decline in the luminosity of all the continuum components from the accretion disk and the X-ray source. As a consequence, the reprocessed X-ray emission lines have also become fainter. The Swift monitoring of NGC 3516 shows remarkable X-ray spectral variability on short (weeks) and long (years) timescales. We investigate whether this variability is driven by obscuration or the intrinsic continuum. We find that the new low-flux spectrum of NGC 3516, and its variability, do not require any new or variable obscuration, and instead can be explained by changes in the ionizing SED that result in lowering of the ionization of the warm-absorber outflows. This in turn induces enhanced X-ray absorption by the warm-absorber outflows, mimicking the presence of new obscuring gas. Using the response of the ionized regions to the SED changes, we place constraints on their density and location.
description: Accepted for publication in The Astrophysical Journal (ApJ), 15 pages, 5 figures
Cross effect of Coulomb correlation and hybridization in the occurrence of ferromagnetism in two shifted band transition metals
Creators: name: Chaves, C. M.
name: Troper, A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this work we discuss the occurrence of ferromagnetism in transition-like metals. The metal is represented by two hybridized($V$) and shifted $(ε_s$) bands one of which includes Hubbard correlation whereas the other is uncorrelated. The starting point is to transform the original Hamiltonian into an effective one. Only one site retains the full correlation (U) while in the others the correlations are represented by an effective field, the self-energy(single-site approximation). This field is self-consistently determined by imposing the translational invariance of the problem. Thereby one gets an exchange split quasi-particle density of states and then an electron-spin polarization for some values of the parameters $(U,V, α, ε_s)$, $α$ being the ratio of the effective masses of the two bands and of the occupation number $n$.
description: 4 pages, 10 figures
Additional file 7 of Identification of priority pathogens for aetiological diagnosis in adults with community-acquired pneumonia in China: a multicentre prospective study
Creators: name: Zhang, Lulu
name: Xiao, Yan
name: Zhang, Guoliang
name: Li, Hongru
name: Zhao, Jianping
name: Chen, Mingwei
name: Chen, Fuhui
name: Liu, Ling
name: Li, Yalun
name: Peng, Liping
name: Zhao, Feng
name: Yang, Donghong
name: Wen, Zhongmei
name: Wu, Lei
name: Wu, Shuo
name: Sun, Yajiao
name: Wang, Ying
name: Chen, Lan
name: Wang, Xinming
name: Wang, Lihui
name: Li, Weimin
name: Qiu, Haibo
name: Chen, Yusheng
name: Gao, Zhancheng
name: Ren, Lili
name: Wang, Jianwei
Publisher: name: figshare
Year: 2023
Subjects: subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Virology
subject: Computational Biology

description: Supplementary Material 7
Additional file 2 of Identification of priority pathogens for aetiological diagnosis in adults with community-acquired pneumonia in China: a multicentre prospective study
Creators: name: Zhang, Lulu
name: Xiao, Yan
name: Zhang, Guoliang
name: Li, Hongru
name: Zhao, Jianping
name: Chen, Mingwei
name: Chen, Fuhui
name: Liu, Ling
name: Li, Yalun
name: Peng, Liping
name: Zhao, Feng
name: Yang, Donghong
name: Wen, Zhongmei
name: Wu, Lei
name: Wu, Shuo
name: Sun, Yajiao
name: Wang, Ying
name: Chen, Lan
name: Wang, Xinming
name: Wang, Lihui
name: Li, Weimin
name: Qiu, Haibo
name: Chen, Yusheng
name: Gao, Zhancheng
name: Ren, Lili
name: Wang, Jianwei
Publisher: name: figshare
Year: 2023
Subjects: subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Virology
subject: Computational Biology

description: Supplementary Material 2
Can the energy dependence of elliptic flow reveal the QGP phase transition?
Creators: name: Heinz, Ulrich W
Publisher: name: arXiv
Year: 2009
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Ideal hydrodynamic simulations are performed to compute the evolution with collision energy of hadron spectra and elliptic flow between AGS and LHC energies. We argue that viscous effects should decrease with increasing energy, improving the applicability of ideal fluid dynamics at higher energies. We show that the increasing radial flow at higher energies pushes the elliptic flow to larger transverse momenta, leading to a peaking and subsequent decrease of the elliptic flow at fixed p_T with increasing collision energy, independent of whether or not there is a phase transition in the equation of state.
description: Final version, to appear in the proceedings of Quark Matter 2009: 21th International Conference on Ultra-Relativistic Nucleus Nucleus Collisions (QM 2009), Knoxville, TN, Mar.30 - Apr.4, 2009. This version 2 uses larger fonts in Fig. 1c; no other changes
Additional file 8 of Identification of priority pathogens for aetiological diagnosis in adults with community-acquired pneumonia in China: a multicentre prospective study
Creators: name: Zhang, Lulu
name: Xiao, Yan
name: Zhang, Guoliang
name: Li, Hongru
name: Zhao, Jianping
name: Chen, Mingwei
name: Chen, Fuhui
name: Liu, Ling
name: Li, Yalun
name: Peng, Liping
name: Zhao, Feng
name: Yang, Donghong
name: Wen, Zhongmei
name: Wu, Lei
name: Wu, Shuo
name: Sun, Yajiao
name: Wang, Ying
name: Chen, Lan
name: Wang, Xinming
name: Wang, Lihui
name: Li, Weimin
name: Qiu, Haibo
name: Chen, Yusheng
name: Gao, Zhancheng
name: Ren, Lili
name: Wang, Jianwei
Publisher: name: figshare
Year: 2023
Subjects: subject: Space Science
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Virology
subject: Computational Biology

description: Supplementary Material 8