cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The steady Navier-Stokes problem for low Reynolds' number viscous jets
Creators: name: Chang, Huakang
Publisher: name: University of British Columbia
Year: 2011

description: The classical existence theorem for the steady Navier-Stokes equations, based on a bound for the solution's Dirichlet integral, provides little qualitative information about the solution. In particular, if a domain is unbounded, it is not evident that the solution will be unique even when the data are small. Inspired by the works of Odqvist for the interior problem and of Finn for the problem of flow past an obstacle, we give a potential theoretic construction of a solution of the steady Navier-Stokes equations in several domains with noncompact boundaries. We begin by studying a scalar quasilinear elliptic problem in a half space, which serves as a model problem for the development of some of the methods which are later applied to the Navier-Stokes equations. Then, we consider Navier-Stokes flow in a half space, modeling such phenomena as a jet emanating from a wall, with prescribed boundary values. The solution which is obtained decays like |x|⁻² at infinity and has a finite Dirichlet integral. Finally, we solve the problem of flow through an aperture in a wall between two half spaces, with a prescribed net flux through the aperture, or with a prescribed pressure drop between the two half spaces. A steady solution is constructed which decays like |x|⁻² at infinity. For small data, uniqueness is proven within the class of functions which decay like |x|⁻¹ at infinity and have finite Dirichlet integrals.
Ground state properties of a confined simple atom by C$_{60}$ fullerene
Creators: name: Neek-Amal, M.
name: Tayebirad, G.
name: Asgari, R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We numerically study the ground state properties of endohedrally confined hydrogen (H) or helium (He) atom by a molecule of C$_{60}$. Our study is based on Diffusion Monte Carlo method. We calculate the effects of centered and small off-centered H- or He-atom on the ground state properties of the systems and describe the variation of ground state energies due to the C$_{60}$ parameters and the confined atomic nuclei positions. Finally, we calculate the electron distributions in $x-z$ plane in a wide range of C$_{60}$ parameters.
description: 23 pages, 9 figures. To appear in J.Phys. B: Atom. Mol. Opt
Study of Correlations Between Radio Jet Velocity and Supermassive Black Hole Mass in Active Galaxies
Creators: name: Pennucci, Timothy
name: Liu, Charles
Publisher: name: Columbia Undergraduate Science Journal
Year: 2006

description: Previous research has shown that numerous characteristics of many host galaxies, such as stellar velocity dispersion and bulge luminosity, are governed by the central supermassive black hole (SMBH). This same SMBH is also thought to be the origin of radio jets propagating outward from the nucleus of these galaxies. It was then hypothesized that the mass of a SMBH influences and correlates with the initial radio jet velocity in active galaxies. Mass and velocity data were collected for 48 radio galaxies but as a result from projection effects due to the nature of active galaxies, apparent transverse velocity replaced intrinsic velocity in this study as the dependent variable. From these transverse velocities, the minimum intrinsic velocities of the radio jets were calculated for further investigation. Three apparent transverse velocity groups arise in the results that may be weakly correlated to SMBH mass. The calculated minimum intrinsic velocity data supports this correlation. These results are qualitative in nature and need to be tested on additional samples. While no direct conclusion can be made, the positive trends produced in this research between SMBH mass and radio jet velocity may later aid in further studies and galactic evolutionary research.
description: Columbia Undergraduate Science Journal, Vol 1 (2006): Spring 2006
Model Order Reduction based on Runge-Kutta Neural Network
Creators: name: Zhuang, Qinyu
name: Lorenzi, Juan Manuel
name: Bungartz, Hans-Joachim
name: Hartmann, Dirk
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Machine Learning (cs.LG)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Model Order Reduction (MOR) methods enable the generation of real-time-capable digital twins, which can enable various novel value streams in industry. While traditional projection-based methods are robust and accurate for linear problems, incorporating Machine Learning to deal with nonlinearity becomes a new choice for reducing complex problems. Such methods usually consist of two steps. The first step is dimension reduction by projection-based method, and the second is the model reconstruction by Neural Network. In this work, we apply some modifications for both steps respectively and investigate how they are impacted by testing with three simulation models. In all cases Proper Orthogonal Decomposition (POD) is used for dimension reduction. For this step, the effects of generating the input snapshot database with constant input parameters is compared with time-dependent input parameters. For the model reconstruction step, two types of neural network architectures are compared: Multilayer Perceptron (MLP) and Runge-Kutta Neural Network (RKNN). The MLP learns the system state directly while RKNN learns the derivative of system state and predicts the new state as a Runge-Kutta integrator.
Международные отношения и Регионоведение,Выпуск 4 (54) 2023
Creators: name: АО «КазУМОиМЯ им.Абылай хана»
Publisher: name: АО «КазУМОиМЯ им.Абылай хана»
Year: 2023

description: Международные отношения и Регионоведение,Выпуск 4 (54) 2023
Studies of systematic uncertainties in the estimation of the monocular aperture of the HiRes experiment
Creators: name: HiRes Collaboration
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have studied several sources of systematic uncertainty in calculating the aperture of the High Resolution Fly's Eye experiment (HiRes) in monocular mode, primarily as they affect the HiRes-II site. The energy dependent aperture is determined with detailed Monte Carlo simulations of the air showers and the detector response. We have studied the effects of changes to the input energy spectrum and composition used in the simulation. A realistic shape of the input spectrum is used in our analysis in order to avoid biases in the aperture estimate due to the limited detector resolution. We have examined the effect of exchanging our input spectrum with a simple E^{-3} power law in the "ankle" region. Uncertainties in the input composition are shown to be significant for energies below about 10^{18} eV for data from the HiRes-II detector. Another source of uncertainties is the choice of the hadronic interaction model in the air shower generator. We compare the aperture estimate for two different models: QGSJet01 and SIBYLL 2.1. We also describe the implications of employing an atmospheric database with hourly measurements of the aerosol component, instead of using an average as has been used in our previously published measurements of the monocular spectra.
description: 27 pages, 15 figures, revision
Miniere e ferriere nel territorio dello Stilaro
Creators: name: Fiorenza, Elia
Publisher: name: Humanities
Year: 2018

description: Il presente studio tende ad esaminare le miniere e ferriere della vallata dello Stilaro e il processo siderurgico antico. Sino alla fine del XIX secolo, il territorio calabrese, in cui insistono i comuni di Bivongi, Pazzano, Stilo, Fabrizia, Mongiana, Guardavalle, costituiva uno dei più importanti centri siderurgici e minerari dell’Italia meridionale. In varie epoche furono attive: tre fabbriche d’armi, trenta ferriere e due fonderie. In questi opifici venina lavorata la limonite, estratta dai giacimenti, ubicati nei monti: Stella, Mammicomito, Petracca e Consolino. Ai nostri giorni, sulla scorta di nuove conoscenze scaturite dallo studio di alcuni documenti d’archivio e da nuovi ritrovamenti archeologici, si sta delineando, sempre più, la convinzione che le attività metallurgiche, nell’area, possano ricondursi a tempi ben più antichi.
description: Humanities, Vol 7, N° 1 (2018)
Complex Dirac-like Electronic Structure in Atomic Site Ordered Rh3In3.4Ge3.6
Creators: name: Savvidou, Aikaterini Flessa
name: Clark, Judith K.
name: Wang, Hua
name: Wei, Kaya
name: Choi, Eun Sang
name: Mozaffari, Shirin
name: Qian, Xiaofeng
name: Shatruk, Michael
name: Balicas, Luis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We report the synthesis via an indium flux method of a novel single-crystalline compound Rh3In3.4Ge3.6 that belongs to the cubic Ir3Ge7 structure type. In Rh3In3.4Ge3.6, the In and Ge atoms choose to preferentially occupy, respectively, the 12d and 16f sites of the Im-3m space group, thus creating a colored version of the Ir3Ge7 structure. Like the other compounds of the Ir3Ge7 family, Rh3In3.4Ge3.6 shows potential as a thermoelectric displaying a relatively large power factor, PF ~ 2 mW/cmK2, at a temperature T ~ 225 K albeit showing a modest figure of merit, ZT = 8 x 10-4, due to the lack of a finite band gap. These figures might improve through a use of chemical substitution strategies to achieve band gap opening. Remarkably, electronic band structure calculations reveal that this compound displays a complex Dirac-like electronic structure relatively close to the Fermi level. The electronic structure is composed of several Dirac type-I and type-II nodes, and even Dirac type-III nodes that result from the touching between a flat band and a linearly dispersing band. This rich Dirac-like electronic dispersion offers the possibility to observe Dirac type-III nodes and study their role in the physical properties of Rh3In3.4Ge3.6 and related Ir3Ge7-type materials.
description: 20 pages, including supplementary information file. 10 figures plus 3 supplementary figures
Anomalies and parities for quintessential and ultra-light axions
Creators: name: Kim, Jihn E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss the energy scales of the explicit breaking terms of the global symmetries \USW~ needed for the quinessential axion (QA) and the ultra-light axion (ULA). The appropriate scale of QA is about $10^{8}$ GeV.
Non fu che un inizio. Analisi e interpretazione di un movimento politico e culturale
Creators: name: Bolognari, Mario
Publisher: name: Humanities
Year: 2019

description: Il Sessantotto è stato un movimento politico, culturale e sociale, che oggi, a cinquanta anni di distanza, possiamo definire storico. In particolare, riteniamo che si possa finalmente passare dall’analisi sentimentale all’analisi critica di un complesso articolarsi di avvenimenti, idee, sentimenti, emozioni che hanno segnato una generazione e un’epoca. In questo saggio si propone una lettura su più piani del movimento, fuori dagli stereotipi che nel tempo si sono stratificati e oltre le retoriche celebrative o ipercritiche compiute negli anni. Il Sessantotto italiano viene inserito nel contesto internazionale e le ibridazioni ideologiche e antropologiche che ne derivarono sono analizzate con estrema adesione alla realtà del tempo.
description: Humanities, Vol 8, N° 1 (2019)
Terremoti e peste: una strana correlazione
Creators: name: La Fauci, Ilaria
Publisher: name: Humanities
Year: 2019

description: La presenza dei fenomeni sismici va esaminata, non per ricostruire una storia geologica, quanto invece per comprendere le reazioni degli uomini, la loro concezione del fenomeno e le loro spiegazioni, un ulteriore modo per capire la complessità della società che li subisce. La storiografia ad oggi presente risulta esigua su tale argomento, trattandolo, in larga misura, marginalmente a studi incentrati sul territorio e, solo in rari casi, come argomento principale delle dissertazioni. La lettura delle opere storiografiche redatte fornisce un quadro sommario, poco addentrato nella tematica, anche qualora questa ne sia il fulcro: le fonti primarie che ne parlano specificatamente sono scarse, il che implica l’unica possibilità di fare affidamento a cronache ed annali, nei quali il fenomeno sismico viene raramente descritto nei minimi dettagli, e in cui per lo più ricorrono di sfuggita annotazioni brevi sull’evento
description: Humanities, Vol 8, N° 1 (2019)
Decelerating and accelerating back-reaction of vacuum to the Universe expansion
Creators: name: Cherkas, S. L.
name: Kalashnikov, V. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Back-reaction of the massless scalar field vacuum to the Universe expansion is considered. Automatic renormalization procedure based on the equations of motion instead of the Friedman equation is used to avoid the cosmological constant problem. It is found, that the vacuum tends to decelerate an expansion of Universe if the conformal acceleration of Universe is equal to zero. In contract, the vacuum acts as the true cosmological constant in Universe expanding with the present day acceleration. Estimation for third derivative of the Universe scale factor with respect to conformal time is presented.
description: 10 pages
Maracaibo y el 19 de abril de 1810: Aun sin estrella en la bandera nacional
Creators: name: Boscán, Ángel Lombardi
Publisher: name: Zenodo
Year: 2021

description: La desintegración del régimen colonial en la América Hispana no fue un proceso uniforme, menos aún en el caso de las provincias que conformaron la Capitanía General de Venezuela. Se analizan las circunstancias históricas que condujeron a la dirigencia política y económica de la provincia de Maracaibo a asumir una posición moderada o pro-realista hasta 1820. Maracaibo, al igual que Coro y Guayana, no sigue el ejemplo de los caraqueños luego del 19 de abril de 1810, porque sus intereses geográficos, comerciales, administrativos, jurisdiccionales y políticos no forman parte de la misma cuadratura. Maracaibo es una región al occidente del país, con una dinámica de funcionamiento autónomo cuyo Lago y zonas adyacentes le confiere identidad propia.
A Message for Peace or a Tool for Oppression? Israeli Jewish-Arab duo Achinoam Nini and Mira Awad’s Representation of Israel at Eurovision 2009
Creators: name: Belkind, Nili
Publisher: name: Current Musicology
Year: 2010

description: Israel’s contenders for the 2009 Eurovision Song Contest (known as the ESC or, as here, Eurovision) were the Israeli Jewish-Arab duo Achinoam Nini and Mira Awad. The chosen song was “There Must Be Another Way,” a tri -lingual appeal for peace and reconciliation sung in Hebrew, Arabic, and English. The decision to nominate Nini and Awad as Israel’s representatives to Eurovision was announced in early January, in the midst of a full-scale war Israel launched on Gaza and its inhabitants, which came in response to several years of rockets fired into Israel from the Hamas-led territory. Given the timing and the high profile of the ESC, an annual competition held among active member countries of the European Broadcasting Union (EBU), the duo’s collaboration generated much public debate in Israel and beyond. The debate highlighted the symbolic charge of the song and its performers, and it continued throughout the year, animated by the political situation, the duo’s activities, and the media that closely followed the process leading to the May 2009 contest and its aftermath. This article will analyze the meanings given to the artistic collaboration of the two performers that were circulating in the public sphere to show how, in this war-torn region, cultural and political domains are intertwined such that wars are fought not only with guns and rockets but also within cultural spheres, and that both domains are constitutive of highly contested social constructions of ethnic and national affiliations.
description: Current Musicology, No 89 (2010): Current Musicology
Formation of relativistic jets by collapsing stars to black holes
Creators: name: Kryvdyk, V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Formation of relativistic jets in the magnetosphere of collapsing stars is considered. These jets will be formed in the polar caps of magnetosphere of collapsing star, where the stellar magnetic field increases during the collapse and the charged particles are accelerated. The jets will generate non-thermal radiation. The analysis of dynamics and emission of particles in the stellar magnetosphere under collapse shows that collapsing stars can by powerful sources of relativistic jets.
description: 8 pages, 3 figures, Accepted for publication in Adv. Space Res
Uniqueness theory for compressible flows
Creators: name: Ravindran, S. S.
Publisher: name: University of British Columbia
Year: 2010

description: This thesis investigates questions of uniqueness in the theory of Compressible flow. First, various uniqueness theorems for compressible flow are reviewed in an expository manner. Roughly, these theorems state that fluid motion in a bounded region Ω = Ω(t) is uniquely determined by its initial data together along with certain boundary conditions. Next, this analysis is extended to magnetohydrodynamic flows and uniqueness theorems are given for a variety of possible cases. The basic question in all these theorems is the determination of appropriate boundary conditions. The proofs are by energy estimates.
[Mini-Review] Of Mice and Madness
Creators: name: Kahn, Lora
name: Marshall, John Joseph
Publisher: name: Columbia Undergraduate Science Journal
Year: 2006

description: Though schizophrenia is a difficult disease to model in an animal because of its complexity, by choosing only one of the disease’s several components to model in a mouse, researchers have been successful in linking certain cognitive disorders associated with schizophrenia to overexpression of the dopamine type 2 receptor. Moreover, they have demonstrated that these cognitive deficits stem from development. Temporarily switching off D2 overexpression has no significant effect on observed deficits, which explains why several drugs targeting the receptor improve behavioral symptoms but have no effect on improving cognitive function.
description: Columbia Undergraduate Science Journal, Vol 1 (2006): Spring 2006
La costruzione dell’influenza nel cyberspazio: la seconda vita della Lega (Nord)
Creators: name: Centorrino, Marco
name: Rizzo, Piero
Publisher: name: Humanities
Year: 2019

description: L’era elettrica ha stravolto il mondo nel breve volgere di qualche decennio. L’apice di questo processo di trasformazione può essere ben sintetizzato dai nuovi standard percettivi e cognitivi riferibili al concetto di cybercezione coniato da Ascott (1994)1, che esprime la portata e gli effetti della transizione dell’essere umano dalla realtà empirica a quella virtuale, grazie all’utilizzo di tecnologie che rivestono la funzione di protesi della mente. In questo scenario, reinventato dall’information processing, sono mutati i linguaggi, le modalità percettive e relazionali; è cambiato il processo di acquisizione delle informazioni, ma anche la dotazione “tecnologica” propedeutica alla costruzione dei significati nell’interazione con l’ambiente empirico. E, quindi, anche le modalità di formazione del pensiero e dell’opinione. Il concetto stesso di mediazione ha subito un decisivo mutamento, dando vita a una dinamica dalle molteplici sfaccettature ed in continua evoluzione: fino a qualche anno fa, appariva dominante il tema della ri-mediazione, per indicare la capacità dei media di agire secondo una doppia logica, in cui, per un verso, riuscivano ad assumere una dimensione di “trasparenza” e, per l’altro, erano capaci di manifestarsi in tutta la loro capacità tecnica (Bolter e Grusin, 1999). Oggi quella dicotomia trova una controparte strutturale nella premediazione (Grusin, 2004): una logica delle mediazioni mirate a disegnare una serie di scenari possibili, prefigurando (premeditando, appunto) i futuri possibili.
description: Humanities, Vol 8, N° 1 (2019)
Avoiding the uncertainty from correlation between |Delta m_{31}^2| and CP phase delta in nu_mu --> nu_mu long baseline experiments
Creators: name: Kimura, Keiichi
name: Takamura, Akira
name: Yoshikawa, Tadashi
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We introduce a new index I_{Delta m_{31}^2} to find where is the better setup of the baseline length and energy to avoid as well as possible the uncertainty from the correlation between Delta m_{31}^2 and cos(delta) in nu_mu --> nu_mu long baseline experiments.
description: 6 pages, 9 figures
Real-time exciton dynamics with time-dependent density-functional theory
Creators: name: Sun, Jiuyu
name: Lee, Cheng-Wei
name: Kononov, Alina
name: Schleife, André
name: Ullrich, Carsten A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Linear-response time-dependent density-functional theory (TDDFT) can describe excitonic features in the optical spectra of insulators and semiconductors, using exchange-correlation (xc) kernels behaving as $-1/k^{2}$ to leading order. We show how excitons can be modeled in real-time TDDFT, using an xc vector potential constructed from approximate, long-range corrected xc kernels. We demonstrate for various materials that this real-time approach is consistent with frequency-dependent linear response, gives access to femtosecond exciton dynamics following short-pulse excitations, and can be extended with some caution into the nonlinear regime.
description: 7 pages, 4 figures
The cosmic jerk parameter in f(R) gravity
Creators: name: Poplawski, Nikodem J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive the expression for the jerk parameter in $f(R)$ gravity. We use the Palatini variational principle and the field equations in the Einstein conformal gauge. For the particular case $f(R)=R-\frac{α^2}{3R}$, the predicted value of the jerk parameter agrees with the SNLS SNIa and X-ray galaxy cluster distance data but does not with the SNIa gold sample data.
description: 8 pages; published version
Amalia Skilton's reports year 3
Creators: name: Skilton, Amalia Horan
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2016
Subjects: subject: ore
subject: Máíhĩ̵̀kì language

description: This file bundle contains all reports written by linguist Amalia Skilton during year 3 of the Máíhĩ̵̀kì Project.
Dynamical Supersymmetry Breaking from Simple Quivers
Creators: name: Antebi, Yaron E.
name: Volansky, Tomer
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct a simple local model of dynamical supersymmetry breaking. The model is a one generation SU(5) that arises from a IIB Z_N orientifold. It does not admit a runaway direction and is argued to stabilize the blowup mode related to the corresponding U(1) factor. The theory demonstrates the existence of a new class of "blowup" fractional branes. We further discuss a compact realization of the quiver on a Calabi-Yau 3-fold which enables one to add fluxes and stabilize the complex structure moduli.
description: 4 pages, revtex4; An error was corrected following [arXiv:0707.0298]
Low-dimensional Singularities with Free Divisors as Discriminants
Creators: name: Buchweitz, Ragnar-Olaf
name: Ebeling, Wolfgang
name: Bothmer, Hans-Christian Graf v.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 32S30

description: We present versal complex analytic families, over a smooth base and of fibre dimension zero, one, or two, where the discriminant constitutes a free divisor. These families include finite flat maps, versal deformations of reduced curve singularities, and versal deformations of Gorenstein surface singularities in C^5. It is shown that such free divisors often admit a "fast normalization", obtained by a single application of the Grauert-Remmert normalization algorithm. For a particular Gorenstein surface singularity in C^5, namely the simple elliptic singularity of type \tilde A_4, we exhibit an explicit discriminant matrix and show that the slice of the discriminant for a fixed j-invariant is the cone over the dual variety of an elliptic curve.
description: 29 pages, misprints and references corrected
An Optical and Structural Study of Pentacene Thin-film Polymorphs
Creators: name: Wong, Franklin
name: He, Rui
name: Pinczuk, Aaron
Publisher: name: Columbia Undergraduate Science Journal
Year: 2006

description: Because of its high conductivity, pentacene is an attractive organic material for electronic applications, but the understanding of its thin-film polymporphism is still lacking. In this work, two pentacene films, 70nm and 2.5um thick, were evaporated onto silicon dioxide substrates. X-ray Diffraction identified two different phases in the 70nm film and four in the 2.5um film. Oxygen and fluorine impurities were detected by X-ray Photoelectron Spectroscopy, suggesting that some of the phases in the films may be impurity-based mixed crystals of pentacene. With improved sensitivity from the resonance Raman effect, low-energy intermolecular phonons were studied and assigned as signature modes to the different polymorphs identified in the films. The 39cm-1 mode is characteristic of the 14.3 Angstrom pure pentacene polymorph, and the 45 and 50cm-1 modes are signatures of the 15.3 Angstrom pure polymorph. This is the first time that the intermolecular modes of pentacene thin films has been studied, and a more thorough analysis can further elucidate the structures of the different thin-film polymorphs.
description: Columbia Undergraduate Science Journal, Vol 1 (2006): Spring 2006
A Survey of O VI, C III, and H I in Highly Ionized High-Velocity Clouds
Creators: name: Fox, Andrew J.
name: Savage, Blair D.
name: Wakker, Bart P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (ABRIDGED) We present a Far-Ultraviolet Spectroscopic Explorer survey of highly ionized high-velocity clouds (HVCs) in 66 extragalactic sight lines. We find a total of 63 high-velocity O VI absorbers, 16 with 21 cm-emitting H I counterparts and 47 ``highly ionized'' absorbers without 21 cm emission. 11 of these high-velocity O VI absorbers are positive-velocity wings (broad O VI features extending asymmetrically to velocities of up to 300 km/s). The highly ionized HVC population is characterized by =38+/-10 km/s and =13.83+/-0.36. We find that 81% (30/37) of high-velocity O VI absorbers have clear accompanying C III absorption, and 76% (29/38) have accompanying H I absorption in the Lyman series. The lower average width of the high-velocity H I absorbers implies the H I lines arise in a separate, lower temperature phase than the O VI. We find that the shape of the wing profiles is well reproduced by a radiatively cooling, vertical outflow. However, the outflow has to be patchy and out of ionization equilibrium. An alternative model, consistent with the observations, is one where the highly ionized HVCs represent the low N(H I) tail of the HVC population, with the O VI formed at the interfaces around the embedded H I cores. Though we cannot rule out a Local Group explanation, we favor a Galactic origin. This is based on the recent evidence that both H I HVCs and the million-degree gas detected in X-ray absorption are Galactic phenomena. Since the highly ionized HVCs appear to trace the interface between these two Galactic phases, it follows that highly ionized HVCs are Galactic themselves. However, the non-detection of high-velocity O VI in halo star spectra implies that any Galactic high-velocity O VI exists at z-distances beyond a few kpc.
description: 36 pages, 14 figures (3 in color), accepted to ApJS. Some figures downgraded to limit file size
On Generating a Lagrangian for Higher Dimensional Gravity
Creators: name: Verwimp, Theo
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Lovelock Lagrangian is for even dimension D obtained from Weil polynomials on the Lie algebra of the Lorentz group SO(1,D-1). The procedure for generating it is related to the Weil homomorphism that converts Lie algebra invariants into cohomology classes.
description: 6 pages
Morin e la “latinità” come radice dell’Europa e base per una nuova società
Creators: name: Giordano, Giuseppe
Publisher: name: Humanities
Year: 2019

description: La “Latinità”, nella prospettiva di Edgar Morin, può essere vista come uno dei fondamenti spirituali dell’Europa. Riconoscere ed essere consapevoli di queste radici, può permettere, al giorno d’oggi, la comprensione della necessità di un’identità sovranazionale, che al tempo stesso non cancelli le identità particolari. La “Latinità” appare così un elemento identitario e di appartenenza utile per acquisire coscienza del destino comune dell’Europa e del mondo, che non può che configurarsi nel senso di un riconoscimento del valore del particolare nell’universale e viceversa. Viviamo un’epoca nella quale spinte nazionalistiche fanno mettere in discussione l’idea stessa di Europa. Eppure, in prospettiva eminentemente storica, sin dal Medioevo tale idea ha guidato il nostro continente in una direzione peculiare, al di là dei contrasti nazionali. Da un punto di vista ideale, teoretico, si può dire, addirittura, che l’Europa “spirituale” – espressione di grande efficacia e bellezza utilizzata da Edmund Husserl – nasca addirittura con i filosofi Greci e il loro desiderio di capire la realtà per via di ragione, producendo idee: metodo, questo, assolutamente specifico, appunto, dell’ “Europa spirituale”
description: Humanities, Vol 8, N° 1 (2019)
Composition of Haar Paraproducts: The Random Case
Creators: name: Bilyk, Dmitriy
name: Lacey, Michael
name: Li, Xiaochun
name: Wick, Brett
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics

description: When is the composition of paraproducts bounded? This is an important, and difficult question, related to to a question of Sarason on composition of Hankel matrices, and the two-weight problem for the Hilbert transform. We consider randomized variants of this question, finding non-classical characterizations, for dyadic paraproducts.
description: 13 pages. Submitted. v2: \showkeys commented out, with other minor changes
High Mass Star Formation. III. The Functional Form of the Submillimeter Clump Mass Function
Creators: name: Reid, Michael A.
name: Wilson, Christine D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the mass function of cold, dusty clumps in 11 low- and high-mass star-forming regions. Using a homogeneous fitting technique, we analyze the shape of each region's clump mass function and examine the commonalities among them. We find that the submillimeter continuum clump mass function in low-mass star-forming regions is typically best fit by a lognormal distribution, while that in high-mass star-forming regions is better fit by a double power law. A single power law clump mass distribution is ruled out in all cases. Fitting all of the regions with a double power law, we find the mean power law exponent at the high-mass end of each mass function is alpha_high = -2.4+/-0.1, consistent with the Salpeter result of alpha = -2.35. We find no region-to-region trend in alpha_high with the mass scale of the clumps in a given region, as characterized by their median mass. Similarly, non non-parametric tests show that the shape of the clump mass function does not change much from region to region, despite the obvious changes in the intrinsic mass scale. This result is consistent with the hypothesis that the clump mass distribution is determined by a highly stochastic process, such as turbulent fragmentation. It may also suggest that the data reduction and analysis techniques strongly affect the shape of the derived mass function.
description: 34 pages, 10 figures, accepted for publication in the October 10, 2006 issue of the Astrophysical Journal
Genoese maritime trade with the Levant and Russia in the 19th century
Creators: name: La Macchia, Angela
Publisher: name: Humanities
Year: 2019

description: The trade in foreign grain from the areas of the Black Sea, an important branch of Genoese maritime commerce, experienced a recovery due to the Treaty with Turkey in 1823. Up until the early 1820s the transport of grains bound for the port of Genova was guaranteed by the Austrian fleet. Later the Sardinian mercantile fleet, also benefitting from the flag discrimination, was able to gain a predominant enposition in the ports of Turkey and the Black Sea. But more importantly, an important trade in cereals with Ligurian sailing ships was organized by the Genoese shipowners and merchants who had transferred their business to that area. Shipments that often reached the English ports directly, as well as being directed to the Genoese port, where cereals were marketed in the western Mediterranean. A maritime traffic that turns out to be a source of huge profits for the Genoese.
description: Humanities, Vol 8, N° 1 (2019)
Loop corrections for approximate inference
Creators: name: Mooij, Joris
name: Kappen, Bert
Publisher: name: arXiv
Year: 2006
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Information Theory (cs.IT)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We propose a method for improving approximate inference methods that corrects for the influence of loops in the graphical model. The method is applicable to arbitrary factor graphs, provided that the size of the Markov blankets is not too large. It is an alternative implementation of an idea introduced recently by Montanari and Rizzo (2005). In its simplest form, which amounts to the assumption that no loops are present, the method reduces to the minimal Cluster Variation Method approximation (which uses maximal factors as outer clusters). On the other hand, using estimates of the effect of loops (obtained by some approximate inference algorithm) and applying the Loop Correcting (LC) method usually gives significantly better results than applying the approximate inference algorithm directly without loop corrections. Indeed, we often observe that the loop corrected error is approximately the square of the error of the approximate inference method used to estimate the effect of loops. We compare different variants of the Loop Correcting method with other approximate inference methods on a variety of graphical models, including "real world" networks, and conclude that the LC approach generally obtains the most accurate results.
description: Technical report, 38 pages, 14 figures
Diffusione insediativa e relazione urbano-rurale: riflessioni e proposte relative alle norme che regolano l’(ab)uso edificatorio dei terreni agricoli in Sicilia
Creators: name: Longo, Antonino
Publisher: name: Humanities
Year: 2019

description: Lo studio dei fenomeni di diffusione insediativa ha affrontato, in modo sempre più approfondito, il rapporto tra la dimensione rurale e quella urbana e, più in generale, l’ecologia del paesaggio inteso come sistema complesso, interrelato e dinamico, in cui interagiscono uomo e natura. L’apparato normativo e gli strumenti di controllo appaiono spesso forme ambigue di interpretazione dello sviluppo territoriale e in forte ritardo nel cogliere le trasformazioni del sistema insediativo; di quì la necessità di una riflessione sui fenomeni di trasformazione dei suoli a destinazione agricola, con particolare riferimento agli (ab)usi posti in essere in termini residenziali nel peculiare contesto regionale siciliano
description: Humanities, Vol 8, N° 1 (2019)
The path group construction of Lie group extensions
Creators: name: Vizman, Cornelia
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 22E65, 81R10, 58D05

description: We present an explicit realization of abelian extensions of infinite dimensional Lie groups using abelian extensions of path groups, by generalizing Mickelsson's approach to loop groups and the approach of Losev-Moore-Nekrasov-Shatashvili to current groups. We apply our method to coupled cocycles on current Lie algebras and to Lichnerowicz cocycles on the Lie algebra of divergence free vector fields.
description: 16 pages
Sicilian Jews and slavery: the case of Jewish community in Messina
Creators: name: Campagna, Giuseppe
Publisher: name: Humanities
Year: 2019

description: Il contributo affronta, tramite l’utilizzo di fonti archivistiche, il ruolo svolto dagli ebrei di Messina nel commercio degli schiavi in Sicilia tra tardomedioevo e prima età moderna. L’obiettivo è una prima ricostruzione dell’inserimento di alcuni componenti della comunità giudaica peloritana nel lucroso traffico di questa preziosa “merce umana” e dell’atteggiamento dell’aljama nei confronti di importanti itproblematiche come la redenzione degli ebrei ridotti in schiavitù.
description: Humanities, Vol 8, N° 1 (2019)
Natural Inflation After Planck 2018
Creators: name: Stein, Nina K.
name: Kinney, William H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate high-precision constraints on Natural Inflation relative to current observational constraints from Planck 2018 + BICEP/Keck(BK15) Polarization + BAO on $r$ and $n_S$, including post-inflationary history of the universe. We find that, for conventional post-inflationary dynamics, Natural Inflation with a cosine potential is disfavored at greater than 95\% confidence out by current data. If we assume protracted reheating characterized by $\overline{w}>1/3,$ Natural Inflation can be brought into agreement with current observational constraints. However, bringing unmodified Natural Inflation into the 68\% confidence region requires values of $T_{\mathrm{re}}$ below the scale of electroweak symmetry breaking. The addition of a SHOES prior on the Hubble Constant $H_0$ only worsens the fit.
description: 13 pages, 4 figures (v2: References added)
A novel wood identification method for Pterocarpus santalinus L.f. species based on fluorescence features
Creators: name: Du, Haihui
name: Wang, Jinzhuan
name: Liu, Bin
name: Liang, Zhi
name: Liu, Zhipeng
name: Zhang, Mingzhe
name: Zhao, Yue
name: Luo, Jiayan
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Plant Biology

description: The precise identification of wood plays a vital role in protecting rare timber species. Among the various wood identification techniques, the fluorescence characteristics of Pterocarpus santalinus L.f. species have rarely been investigated. In this study, the types, number of fluorescent compounds, maximum excitation and emission wavelengths, and effects of solvent and pH were characterized by fluorescence photographs, fluorescence emission spectra and fluorescence contour spectra, respectively. The results indicate that the fluorescence of P. santalinus species is relatively strong, and the fluorescent substances extracted in different solvents exhibit different color photographs under irradiation. The spectrum is also affected by the polarity of the solvent and the pH of the solution. In addition, the method for extracting the fluorescent compounds in P. santalinus samples was optimized. Based on the reported results, a good correlation between the fluorescence characteristics and the wood species was obtained as a potentially new identification method for precious rosewoods at the species level.
Miniere e ferriere nel territorio dello Stilaro
Creators: name: Fiorenza, Elia
Publisher: name: Humanities
Year: 2019

description: Il presente studio tende ad esaminare le miniere e ferriere della vallata dello Stilaro e il processo siderurgico antico. Sino alla fine del XIX secolo, il territorio calabrese, in cui insistono i comuni di Bivongi, Pazzano, Stilo, Fabrizia, Mongiana, Guardavalle, costituiva uno dei più importanti centri siderurgici e minerari dell’Italia meridionale. In varie epoche furono attive: tre fabbriche d’armi, trenta ferriere e due fonderie. In questi opifici venina lavorata la limonite, estratta dai giacimenti, ubicati nei monti: Stella, Mammicomito, Petracca e Consolino. Ai nostri giorni, sulla scorta di nuove conoscenze scaturite dallo studio di alcuni documenti d’archivio e da nuovi ritrovamenti archeologici, si sta delineando, sempre più, la convinzione che le attività metallurgiche, nell’area, possano ricondursi a tempi ben più antichi.
description: Humanities, Vol 8, N° 1 (2019)
Thermodynamics of Pseudo-Hermitian Systems in Equilibrium
Creators: name: Jakubsky, Vit
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In study of pseudo(quasi)-hermitian operators, the key role is played by the positive-definite metric operator. It enables physical interpretation of the considered systems. In the article, we study the pseudo-hermitian systems with constant number of particles in equilibrium. We show that the explicit knowledge of the metric operator is not essential for study of thermodynamic properties of the system. We introduce a simple example where the physically relevant quantities are derived without explicit calculation of either metric operator or spectrum of the Hamiltonian.
description: 9 pages, 2 figures, to appear in Mod.Phys.Lett. A; historical part of sec. 2.1 reformulated, references corrected; typos corrected
On the relation between the degree of internationalization of cited and citing publications: A field level analysis, including and excluding self-citations
Creators: name: Abramo, Giovanni
name: D'Angelo, Ciriaco Andrea
name: Di Costa, Flavia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: The growing complexity of scientific challenges demands increasingly intense research collaboration, both domestic and international. The resulting trend affects not only the modes of producing new knowledge, but also the way it is disseminated within scientific communities. This paper analyses the relationship between the "degree of internationalization" of a country's scientific production and that of the relevant citing publications. The empirical analysis is based on 2010-2012 Italian publications. Findings show: i) the probability of being cited increases with the degree of internationalization of the research team; ii) totally domestic research teams tend to cite to a greater extent totally domestic publications; iii) vice versa, publications resulting from international collaborations tend to be more cited by totally foreign publications rather than by publications including domestic authors. These results emerge both at overall and at discipline level. Findings might inform research policies geared towards internationalization.
The domestic localization of knowledge flows as evidenced by publication citation: The case of Italy
Creators: name: Abramo, Giovanni
name: D'Angelo, Ciriaco Andrea
Publisher: name: arXiv
Year: 2021
Subjects: subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: This work applies a new approach to measure knowledge flows. Assuming that citation linkages between articles imply a flow of knowledge from the cited to the citing authors, we investigate the geographic flows of scientific knowledge produced in Italy across its regions, at both overall and field level. Furthermore, we measure the the specialization indexes for outflows and inflows of knowledge by a given region. Findings show that larger regions in terms of research output are more likely net exporters of new knowledge. At the same time, we register a positive correlation between the share of intraregional flows and the size of overall scientific output of a region.
description: arXiv admin note: text overlap with arXiv:1909.08911
“VI Beethoven-Studienkolleg” Einführung in die textkritische Arbeit mit Edirom: Digitale Darstellung von Schreibschichten in Beethoven-Handschriften. Bonn, 26-28 agosto 2013
Creators: name: Marsico, Federica
Publisher: name: Pavia University Press - Edizioni dell'Università degli Studi di Pavia
Year: 2014

description: Philomusica on-line, Vol 13, N° 1 (2014)
Just for Dancing? Studi italiani sulle musiche elettroniche popular all’alba del terzo millennio
Creators: name: Bizzaro, Nicola
name: Bratus, Alessandro
Publisher: name: Pavia University Press - Edizioni dell'Università degli Studi di Pavia
Year: 2014

description: Philomusica on-line, Vol 13, N° 2 (2014): Just for Dancing? Studi italiani sulle musiche elettroniche popular all’alba del terzo millennio
Three-Dimensional Imaging as a Novel Approach to Breast Cancer Reconstruction
Creators: name: Rudolph, Lauren S
name: Karp, Nolan
name: Tepper, Oren
name: Small, Kevin
name: Unger, Jacob
name: Davidson, Edward
name: Choi, Mihye
Publisher: name: Columbia Undergraduate Science Journal
Year: 2007

description: Today surgical planning in reconstruction of female breast cancer patients is limited by the inability of plastic surgeons to define the necessary volume, shape and contour of the breast. A novel approach to breast cancer reconstruction is three-dimensional imaging, which has gained popularity in an array of industries. Three-dimensional (3D) images of a patient’s breasts enable a surgeon to not only visually assess the size, shape, contour, and symmetry of the breasts, but also to obtain quantitative breast measurements and make volumetric calculations. The following study is a preliminary analysis of female patient volunteers undergoing unilateral tissue-expander/implant reconstruction by one of two senior authors. 3D images were obtained during routine preoperative and postoperative office visits and served as a guide by the surgeon for surgical planning. Twelve patients have completed 3D assisted unilateral breast reconstruction to date. Overall breast symmetry improved at the completion of reconstruction in the majority of patients. Average postoperative symmetry was 95% as compared to 88% preoperatively. With 3D images plastic surgeons are able to objectively assess their patient, which is an improvement to the current surgical planning that utilizes subjective two-dimensional images and visual estimates.
description: Columbia Undergraduate Science Journal, Vol 2 (2007): Spring 2007