cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Criminal Networks Analysis in Missing Data scenarios through Graph Distances
Creators: name: Ficara, Annamaria
name: Cavallaro, Lucia
name: Curreri, Francesco
name: Fiumara, Giacomo
name: De Meo, Pasquale
name: Bagdasar, Ovidiu
name: Song, Wei
name: Liotta, Antonio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Data collected in criminal investigations may suffer from: (i) incompleteness, due to the covert nature of criminal organisations; (ii) incorrectness, caused by either unintentional data collection errors and intentional deception by criminals; (iii) inconsistency, when the same information is collected into law enforcement databases multiple times, or in different formats. In this paper we analyse nine real criminal networks of different nature (i.e., Mafia networks, criminal street gangs and terrorist organizations) in order to quantify the impact of incomplete data and to determine which network type is most affected by it. The networks are firstly pruned following two specific methods: (i) random edges removal, simulating the scenario in which the Law Enforcement Agencies (LEAs) fail to intercept some calls, or to spot sporadic meetings among suspects; (ii) nodes removal, that catches the hypothesis in which some suspects cannot be intercepted or investigated. Finally we compute spectral (i.e., Adjacency, Laplacian and Normalised Laplacian Spectral Distances) and matrix (i.e., Root Euclidean Distance) distances between the complete and pruned networks, which we compare using statistical analysis. Our investigation identified two main features: first, the overall understanding of the criminal networks remains high even with incomplete data on criminal interactions (i.e., 10% removed edges); second, removing even a small fraction of suspects not investigated (i.e., 2% removed nodes) may lead to significant misinterpretation of the overall network.
description: 18 pages, 4 figures, submitted to PLoS ONE Journal
Electromagnetic Non Destructive Evaluation and Inverse Problems
Creators: name: Calvano, Flavio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: This thesis is focused on Eddy Current Testing (ECT), a technique for the
Non Destructive Testing of conductive materials. In particular we study
the quantitative imaging (inverse problem) of defects in conductive materials.
By quantitative imaging we means imaging methods based on numerical
models of the interaction between the probe and the defect(s). The
imaging methods attempt to provide an image of the defect at variance
of commercial instruments that, generally, detect the defect and may have
limited capabilities of extracting its major sizes by means of calibration
curves obtained in predened conditions. In addition, numerical models of
the probe-defect interaction (direct problem) play a relevant role for the
computer aided design of the probe, where commercial codes typically fail
to treat this kind of problems. In this thesis we present methods for the
solution of both the direct and the inverse problems in ECT. The methods
have been developed ad-hoc for ECT and have been optimized for accuracy
and speed in view of real-time applications.
Rechnergestütztes Qualitätsmanagement
Creators: name: Wormanns, Gerhard
Publisher: name: LANDTECHNIK
Year: 1998

description: Wird die Qualitätskontrolle, mit der bei Kartoffeln bisher nur die äußeren Mängel zerstörungsfrei erfasst werden können, durch Methoden der Qualitätssicherung abgelöst, verlagert sich der Schwerpunkt des Qualitätsmanagements von der Aussonderung auf die Vermeidung qualitätsgeminderter Kartoffeln. Grundlage für eine wesentliche Verbesserung der Kartoffelqualität soll die Verknüpfung von Daten aus der Eignungskontrolle der Maschinen, der Wareneingangskontrolle, der Kontrolle des Lagerklimas und der Warenausgangskontrolle mit einem speziellen PC-Programm sein. Das PC-Programm QLAB bietet in seiner Version 4.0 bereits einige Voraussetzungen für ein verbessertes Qualitätsmanagement in der Kartoffelwirtschaft.
description: LANDTECHNIK, Bd. 53 Nr. 1 (1998)
Topological dipole Floquet solitons
Creators: name: Ivanov, Sergey K.
name: Kartashov, Yaroslav V.
name: Heinrich, Matthias
name: Szameit, Alexander
name: Torner, Lluis
name: Konotop, Vladimir V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We theoretically introduce a new type of topological dipole solitons propagating in a Floquet topological insulator based on a kagome array of helical waveguides. Such solitons bifurcate from two edge states belonging to different topological gaps and have bright envelopes of different symmetries: fundamental for one component, and dipole for the other. The formation of dipole solitons is enabled by unique spectral features of the kagome array which allow the simultaneous coexistence of two topological edge states from different gaps at the same boundary. Notably, these states have equal and nearly vanishing group velocities as well as the same sign of the effective dispersion coefficients. We derive envelope equations describing components of dipole solitons and demonstrate in full continuous simulations that such states indeed can survive over hundreds of helix periods without any noticeable radiation into the bulk.
description: 13 pages, 6 figures, to appear in Physical Review A
On the use of event logs for the analysis of system failures
Creators: name: Pecchia, Antonio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: Computer systems are the basis for daily human activities, and, even more importantly, they play a key role in many critical domains. For this reason, understanding the failure behavior of computer systems is crucial to engineers. Event logs, i.e., the set of files where computing entities register events related to regular and anomalous activities occurred during the system operational phase, represent a valuable source of data to conduct a failure analysis. Study based on event logs span over the past three decades; however, computer systems have deeply changed over this timeframe.

Investigating the suitability of traditional assumptions and techniques underlying log-based failure analysis, in spite of the changes occurred in the computer systems industry, is of paramount importance. The focus of the thesis is to evaluate the accuracy of current logging mechanisms at reporting failures, and to develop novel techniques to make event logs effective to infer failure data. Techniques involve production, collection, and correlation of the failure data in the log to support accurate system dependability characterization. The benefits that can be achieved by adopting proposed techniques, are shown by means of experiments conducted in the context of real-world, complex distributed systems.
Tracergas-Technik
Creators: name: Hoffmann, Anke
name: Seipelt, Frank
Publisher: name: LANDTECHNIK
Year: 1998

description: Zur Quantifizierung von Luftwechselraten frei gelüfteter Stallgebäude gibt es verschiedene Ansätze, aber noch keine praxistaugliche Referenzmethode. Nachfolgend wird eine Weiterentwicklung der Tracergas-Technik vorgestellt.
description: LANDTECHNIK, Bd. 53 Nr. 1 (1998)
Riduzione delle emissioni azotate nell’allevamento della bufala da latte
Creators: name: Contò, Giacomo
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: Lo scopo del presente lavoro è stato quello di valutare gli effetti, della metionina rumino-protetta con un più basso apporto proteico nella razione, sulle produzioni e sulle escrezioni di azoto nelle bufale in lattazione. Nell’ottica di ridurre sempre più l’impatto ambientale degli allevamenti, migliorando l’efficienza dell’utilizzazione dell’azoto. Nella prova durata 120 d sono stati impiegati 16 bufale in lattazione divise in 2 gruppi, ciascuno di 8 animali. Entrambi i gruppi ricevevano uguali razioni per composizione e per concentrazione energetica (0.90 UFL/kg SS), mentre differivano per l’apporto di protidi grezzi. Un gruppo (controllo) riceveva 15.16% di PG/kg di DM, mentre l’altro (RPM) riceveva 14.24% di PG/kg di DM + 12 g di metionina rumino-protetta. Nessuna differenza significativa è stata rilevata sulle caratteristiche quanti/qualitative e quelle tecnologiche del latte per entrambi i gruppi, con una produzione media di latte di 7.63 e 7.69 kg/d rispettivamente per il gruppo RPM e di controllo. I valori di urea ematica (BU) sono stati più bassi nel gruppo RPM rispetto a quelli di controllo (5.88 vs 7.01 mmol/l, P<0.05), così come la quantità di azoto totale escreto con le urine pari a 179.17 e 207.52 g/d (P<0.05). La quantità totale di azoto escreto con le deiezioni è stata di 314.65 vs 358.57 g/d (P<0.05) rispettivamente del gruppo RPM e di controllo. Questi dati suggeriscono che è possibile ridurre ulteriormente l’apporto di azoto nella razione, impiegando contemporaneamente amminoacidi essenziali in forma rumino-protetta, al fine di mantenere invariate le produzioni, migliorando l’efficienza di utilizzo dell’azoto e riducendone le escrezioni nell’ambiente.
Wirtschaftliche Aspekte der hofeigenen Herstellung von Rapsöl als Treibstoff
Creators: name: Bokermann, Ralf
Publisher: name: LANDTECHNIK
Year: 1998

description: Ein wesentliches Ziel sowohl der nationalen als auch der EG-Agrarpolitik ist es, die Landwirtschaft mit ihren vielfältigen Funktionen über eine Sicherung der betrieblichen Einkommen zu stabilisieren. Ein Weg hierzu ist die Erschließung zusätzlicher Erwerbszweige, wie die der hofeigenen Verarbeitung landwirtschaftlicher Rohstoffe. Eine relativ sichere und zudem hohe regionale Wertschöpfung wäre möglich, wenn der landwirtschaftliche Bedarf an Treibstoffen in nennenswertem Umfang über die hofeigene Herstellung von Pflanzenöl gedeckt werden könnte. Voraussetzung ist, dass die Herstellung wirtschaftlich gestaltbar wäre. Auf diese wirtschaftlichen Aspekte wird unter gegenwärtigen Preis-Kosten-Bedingungen eingegangen.
description: LANDTECHNIK, Bd. 53 Nr. 1 (1998)
Energetische Einordnung von AME
Creators: name: Anggraini, Ananta A.
name: Krause, Rüdiger
name: Löhrlein, Hans- Peter
Publisher: name: LANDTECHNIK
Year: 1998

description: Altfettmethylester (AME) liegt in der Energiebilanz erheblich günstiger als Rapsöl und RME und ist konkurrenzfähig gegenüber Dieselkraftstoff. Auch die Ökobilanz ist positiv, sodass letztlich der aktuelle Marktpreis für technisches Fett für den Einsatz entscheidend sein wird. Im Rahmen der angestrebten Kreislaufwirtschaft bietet sich eine Lösung an, bei der das Sammel- und Entsorgungsunternehmen die Reinigung, Aufbereitung und Umesterung von Altfetten vor Ort vornimmt und der gewonnene Kraftstoff im direkten Umfelde eingesetzt wird.
description: LANDTECHNIK, Bd. 53 Nr. 1 (1998)
Charge density waves in multiple-$Q$ spin states
Creators: name: Hayami, Satoru
name: Motome, Yukitoshi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Coupling between spin and charge degrees of freedom in electrons is a source of various electronic and magnetic properties of solids. We theoretically study charge density waves induced by the spin-charge coupling in the presence of magnetic orderings in itinerant magnets. By performing a perturbative calculation in the weak-coupling limit of the Kondo lattice model, we derive a useful formula for the relationship between charge and spin density waves, which can be applied to any magnetic orderings, including noncollinear and noncoplanar ones composed of multiple spin density waves called multiple-$Q$ magnetic orderings. We demonstrate the predictive power for single-$Q$ and double-$Q$ states including skyrmion and meron-antimeron crystals on a square lattice, in comparison with the numerical calculations. Moreover, we show that the charge density waves contain richer information than the spin density waves, and are indeed useful in distinguishing the spin textures with similar spin structure factors. We discuss the relation to bond modulation in terms of the kinetic bond energy and the vector spin chirality. We also perform numerical calculations beyond the perturbative regime and find that the charge density waves can be enhanced when the electron filling is commensurate. Furthermore, we investigate the effect of the spin-orbit coupling, which can lead to additional charge density waves owing to effective anisotropic magnetic interactions in momentum space. Our result will provide a way to identify complex magnetic orderings and their origins from the charge modulations.
description: 15 pages, 7 figures
MOA-2006-BLG-074: recognizing xallarap contaminants in planetary microlensing
Creators: name: Rota, P.
name: Hirao, Y.
name: Bozza, V.
name: Abe, F.
name: Barry, R.
name: Bennett, D. P.
name: Bhattacharya, A.
name: Bond, I. A.
name: Donachie, M.
name: Fukui, A.
name: Fujii, H.
name: Silva, S. Ishitani
name: Itow, Y.
name: Kirikawa, R.
name: Koshimoto, N.
name: Li, M. C. A.
name: Matsubara, Y.
name: Miyazaki, S.
name: Muraki, Y.
name: Olmschenk, G.
name: Ranc, C.
name: Satoh, Y.
name: Sumi, T.
name: Suzuki, D.
name: Tristram, P. J.
name: Yonehara, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: MOA-2006-BLG-074 was selected as one of the most promising planetary candidates in a retrospective analysis of the MOA collaboration: its asymmetric high-magnification peak can be perfectly explained by a source passing across a central caustic deformed by a small planet. However, after a detailed analysis of the residuals, we have realized that a single lens and a source orbiting with a faint companion provides a more satisfactory explanation for all the observed deviations from a Paczynski curve and the only physically acceptable interpretation. Indeed the orbital motion of the source is constrained enough to allow a very good characterization of the binary source from the microlensing light curve. The case of MOA-2006-BLG-074 suggests that the so-called xallarap effect must be taken seriously in any attempts to obtain accurate planetary demographics from microlensing surveys.
description: 14 pages, 8 figures, accepted by AAS
Geometry of the symplectic Stiefel manifold endowed with the Euclidean metric
Creators: name: Gao, Bin
name: Son, Nguyen Thanh
name: Absil, P. -A.
name: Stykel, Tatjana
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: The symplectic Stiefel manifold, denoted by $\mathrm{Sp}(2p,2n)$, is the set of linear symplectic maps between the standard symplectic spaces $\mathbb{R}^{2p}$ and $\mathbb{R}^{2n}$. When $p=n$, it reduces to the well-known set of $2n\times 2n$ symplectic matrices. We study the Riemannian geometry of this manifold viewed as a Riemannian submanifold of the Euclidean space $\mathbb{R}^{2n\times 2p}$. The corresponding normal space and projections onto the tangent and normal spaces are investigated. Moreover, we consider optimization problems on the symplectic Stiefel manifold. We obtain the expression of the Riemannian gradient with respect to the Euclidean metric, which then used in optimization algorithms. Numerical experiments on the nearest symplectic matrix problem and the symplectic eigenvalue problem illustrate the effectiveness of Euclidean-based algorithms.
LA RUINA JOVEN: UN RECORRIDO CRÍTICO POR ESCRITURAS PUNKS ARGENTINAS (1977-2001)
Creators: name: Garione, Flavia
name: Fernández, Rocío
Publisher: name: Zenodo
Year: 2023
Subjects: Punk
Ruina
Ruin
Juan Carlos Kreimer
Resistencia
Resistance
Homoxidal

description: Entre 1977 y 1978, el Jubileo de Plata de la Reina Isabel II se constituye en escenario de dos hechos artísticos: la puesta en escena de “God save the Queen” en el Támesis y el estreno de Jubilee de Derek Jarman, la primera película punk. Tanto la línea “There is no future in England's dreaming” de la canción, como el horror que invade a la Reina Isabel I en el film cuando viaja al futuro distópico de los setenta y ve la ruina en la que se ha convertido su imperio, evidencian que en Inglaterra el punk estuvo estrechamente ligado a un sentimiento de decadencia. Por su parte, en 1976, Juan Carlos Kreimer, un joven argentino que escapa de la violencia política, escribe una novela-diario, De ninguna parte, en la que reconstruye la marginalidad y los inicios del punk londinense. Dicha experiencia quedará plasmada, apenas dos años más tarde, en Punk. La muerte joven, especie de manual que intentaba difundir la historia y las estrategias del movimiento punk en nuestro país al mismo tiempo que traducía el deseo de ruina que movía a las juventudes hastiadas del mundo. Teniendo en cuenta el contexto de recepción del libro, este trabajo parte de la pregunta acerca del efecto que tuvo ese deseo de arruinamiento y no futuro del punk durante los ´80 y los ´90 para proponer, a partir de la lectura de los fanzines Resistencia (1984-2001) y Homoxidal (2001-2003), una concepción creadora y políticamente revolucionaria de la destrucción y la escritura.
The isoperimetric problem for Holderian curves
Creators: name: Almeida, Ricardo
name: Torres, Delfim F. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optimization and Control (math.OC)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 49K05; 26B05; 39A12

description: We prove a necessary stationary condition for non-differentiable isoperimetric variational problems with scale derivatives, defined on the class of Hölder continuous functions.
description: 11 pages
Wealth disparities and economic flow: Assessment using an asset exchange model with the surplus stock of the wealthy
Creators: name: Kato, Takeshi
name: Hiroi, Yoshinori
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Economics (econ.GN)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Economics and business
subject: FOS: Physical sciences
subject: 91B43, 62P20

description: How can we limit wealth disparities while stimulating economic flows in sustainable societies? To examine the link between these concepts, we propose an econophysics asset exchange model with the surplus stock of the wealthy. The wealthy are one of the two exchange agents and have more assets than the poor. Our simulation model converts the surplus contribution rate of the wealthy to a new variable parameter alongside the saving rate and introduces the total exchange (flow) and rank correlation coefficient (metabolism) as new evaluation indexes, adding to the Gini index (disparities), thereby assessing both wealth distribution and the relationships among the disparities, flow, and metabolism. We show that these result in a gamma-like wealth distribution, and our model reveals a trade-off between limiting disparities and vitalizing the market. To limit disparities and increase flow and metabolism, we also find the need to restrain savings and use the wealthy surplus stock. This relationship is explicitly expressed in the new equation introduced herein. The insights gained by uncovering the root of disparities may present a persuasive case for investments in social security measures or social businesses involving stock redistribution or sharing.
description: 16 pages, 7 figures. Published online at https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0259323
Aspects of pitch and pitch-class organization in Nikolai Roslavets's Trois compositions pour piano
Creators: name: McIsaac, David William
Publisher: name: University of British Columbia
Year: 2010

description: Nikolai Andreevich Roslavets (1881-1944) is a unique figure in Russian avant-garde musical developments of this century. His system of tonal organization, .similar to Scriabin's reliance on a central chordal complex . . . was based on chords of six to eight or more tones, used . . . as substitutes for the functional relationships of classical tonality, which he did not reject but rather tried to expand. These "synthetic chords" of specific and invariable interval lie structure could be transposed not only to the seven pitches of the classical diatonic scale, but also to all twelve degrees of the chromatic scale. Through systematic application of such transpositions, Roslavets's compositions revealed elements similar to dodecaphonic serial thinking as early as 1914-15. . . . (Detlef Gojowy, "Half Time for Nikolai Roslavets," in Russian and Soviet Musics Essays for Boris Sctowarz , 212. ) Trois Compositions pour piano (1914) exhibit such characteristics. Gojowy ‘s Neue sov/jetische Musi A der 20er Jahret and George Perle's Serial Composition and Atonality both include limited references to Trois Compositions as well as general commentary about Roslavets's compositional techniques. However, detailed studies of pitch and pitch-class (PC) organization in music by this little-known composer are lacking. Proceeding from the analyses of Gojowy and Perle, the present thesis examines certain aspects of Roslavets's "synthetic chord" system (designated in the thesis as the interval-class complex or ICC system) in Trois Compositions, including: (1) PC contents of harmonies in the pieces--contents based on transposition-levels (T-levels) of ICCs associated with the pieces—and variances thereof, some of which are related to the forms of the pieces; (2) harmonic successions and associated T-levelss (3) rhythmic aspects of these T-levels and their successions, which indicate a basis of hierarchy of T-levelss (4) characteristics of T-level successions as to PC content, and PC invariance and pitch continuity involving adjacent T-levels, particularly T-levels related by interval-class (IC) 3s and (5) patterns of linear and vertical ordering of PCs as to their inclusion in particular T-levels. These are discussed in Chapter Two, following an introduction to Roslavets and his music in Chapter One. In consideration of Roslavets's position as a post-Romantic composer, other compositional techniques and tendencies evident in Trois Compositions are investigated in the thesis. Chapter Three involves an examination of tonality in the three pieces, while Chapter Four involves a study of octatonicism and serial-ism, some characteristics of which are to be found in Trois Compositions.
Precise determination of the sigma pole location from a dispersive analysis
Creators: name: Garcia-Martin, R.
name: Kaminski, R.
name: Pelaez, J. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We review how the use of recent precise data on kaon decays together with forward dispersion relations (FDR) and Roy's equations allow us to determine the sigma resonance pole position very precisely, by using only experimental input. In addition, we present preliminary results for a modified set of Roy-like equations with only one subtraction, that show a remarkable improvement in the precision around the sigma resonance region. For practical applications, these results are shown to be very well approximated by a very simple conformal expansion.
description: 5 pages, 2 figures. To appear in the proceedings of the Workshop on Scalar Mesons and Related Topics, Lisbon, Portugal, 11-16 Feb 2008
Il patrimonio culturale subacqueo universale e le esigenze di tutela internazionale
Creators: name: Migliorati, Claudia
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: Con riferimento al sistema di protezione internazionale del patrimonio culturale subacqueo sono stati esaminati i diversi ambiti in cui tale regime di tutela si è rivelato. a partire dalla protezione universale realizzata sul piano convenzionale con la Convenzione di Parigi del 2001, realizzata sotto l'egida dell'Unesco, sino a prendere in considerazione gli strumenti realizzati sul piano U.E. infine, sono state prese in esame nuove forme di cooperazione regionale e bilaterale a tutela di specifici siti culturali subacquei.
Cepheid Parallaxes and the Hubble Constant
Creators: name: van Leeuwen, Floor
name: Feast, Michael W.
name: Whitelock, Patricia A.
name: Laney, Clifton D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Revised Hipparcos parallaxes for classical Cepheids are analysed together with 10 HST-based parallaxes (Benedict et al.). In a reddening-free V,I relation we find that the coefficient of logP is the same within the uncertainties in our Galaxy as in the LMC, contrary to some previous suggestions. Cepheids in the inner region of NGC4258 with near solar metallicities (Macri et al.) confirm this result. We obtain a zero-point for the reddening-free relation and apply it to Cepheids in galaxies used by Sandage et al. to calibrate the absolute magnitudes of SNIa and to derive the Hubble constant. We revise their result from 62 to 70+/-5 km/s/Mpc. The Freedman et al. 2001 value is revised from 72 to 76+/-8 km/s/Mpc. These results are insensitive to Cepheid metallicity corrections. The Cepheids in the inner region of NGC4258 yield a modulus of 29.22+/-0.03(int) compared with a maser-based modulus of 29.29+/-0.15. Distance moduli for the LMC, uncorrected for any metallicity effects, are; 18.52+/-0.03 from a reddening-free relation in V,I; 18.47+/-0.03 from a period-luminosity relation at K; 18.45+/-0.04 from a period-luminosity-colour relation in J,K. Adopting a metallicity correction in V,I from Marci et al. leads to a true LMC modulus of 18.39+/-0.05.
description: 9 pages, 1 figure, on-line material from mwf@artemisia.ast.uct.ac.za. Accepted for MNRAS
Inertial frame rotation induced by rotating gravitational waves
Creators: name: Lynden-Bell, Donald
name: Bicak, Jiri
name: Katz, Joseph
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We calculate the rotation of the inertial frames within an almost flat cylindrical region surrounded by a pulse of non-axially-symmetric gravitational waves that rotate about the axis of our cylindrical polar coordinates. Our spacetime has only one Killing vector. It is along the z-axis and hypersurface orthogonal. We solve the Einstein equations to first order in the wave amplitude and superpose such linearized solutions to form a wave pulse. We then solve the relevant Einstein equation to second order in the amplitude to find the rotation of inertial frames produced by the pulse. The rotation is without time delay. The influence of gravitational wave angular momentum on the inertial frame demonstrates that Mach's principle can not be expressed in terms of the influence of the stress-energy-momentum tensor alone but must involve also influences of gravitational wave energy and angular momentum.
description: Scheduled to appear in Class. and Quantum Grav. July 2008, "inertial" added in title
Electrical transport and optical studies of ferromagnetic Cobalt doped ZnO nanoparticles exhibiting a metal-insulator transition
Creators: name: Naeem, M.
name: Hasanain, S. K.
name: Mumtaz, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The observed correlation of oxygen vacancies and room temperature ferromagnetic ordering in Co doped ZnO1-o nanoparticles reported earlier (Naeem et al Nanotechnology 17, 2675-2680) has been further explored by transport and optical measurements. In these particles room temperature ferromagnetic ordering had been observed to occur only after annealing in forming gas. In the current work the optical properties have been studied by diffuse reflection spectroscopy in the UV-Vis region and the band gap of the Co doped compositions has been found to decrease with Co addition. Reflections minima are observed at the energies characteristic of Co+2 d-d (tethrahedral symmetry) crystal field transitions, further establishing the presence of Co in substitutional sites. Electrical transport measurements on palletized samples of the nanoparticles show that the effect of a forming gas is to strongly decrease the resistivity with increasing Co concentration. For the air annealed and non-ferromagnetic samples the variation in the resistivity as a function of Co content are opposite to those observed in the particles prepared in forming gas. The ferromagnetic samples exhibit an apparent change from insulator to metal with increasing temperatures for T>380K and this change becomes more pronounced with increasing Co content. The magnetic and resistive behaviors are correlated by considering the model by Calderon et al [M. J. Calderon and S. D. Sarma, Annals of Physics 2007 (Accepted doi: 10.1016/j.aop.2007.01.010] where the ferromagnetism changes from being mediated by polarons in the low temperature insulating region to being mediated by the carriers released from the weakly bound states in the higher temperature metallic region.
description: 7 pages, 6 figures
Measurement of the top-quark mass using missing $E_T$+jets events with secondary vertex $b$-tagging at CDF II
Creators: name: CDF-Collaboration
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present a measurement of the top-quark mass in $p\bar p$ collisions at \hbox{$\sqrt{s}=1.96$} TeV which uses events with an inclusive signature of missing transverse energy and jets. % The event selection is sensitive to $t\bar t\to W^+bW^-\bar b\to lνb q q^\prime \bar b$ independent of the lepton flavor, and results in a large acceptance for $W\toτν$ decays. % All-hadronic $t\bar t$ decays and events with identified electrons or muons are vetoed to provide a statistically independent sample with respect to all previous measurements. % The top-quark mass is inferred from the distribution of the scalar sum of all jet transverse energies and the missing transverse energy. Using 311 pb$^{-1}$ of integrated luminosity recorded by the Collider Detector at Fermilab, we measure a top-quark mass $m_t = 172.3 ^{+10.8}_{-9.6}$(stat.)$\pm 10.8$(syst.) GeV/$c^2$. While the uncertainty on $m_t$ is larger than that of other measurements, the result is statistically uncorrelated with those of other methods, and thus can help to reduce the overall $m_t$ uncertainty when combined with other existing measurements.
description: 8 pages, 4 figures
Maximum Likelihood algorithm for parametric component separation in CMB experiments
Creators: name: Stompor, R.
name: Leach, S.
name: Stivoli, F.
name: Baccigalupi, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss an approach to the component separation of microwave, multi-frequency sky maps as those typically produced from Cosmic Microwave Background (CMB) Anisotropy data sets. The algorithm is based on the two step, parametric, likelihood-based technique recently elaborated on by Eriksen et al., (2006), where the foreground spectral parameters are estimated prior to the actual separation of the components. In contrast with the previous approaches, we accomplish the former task with help of an analytically-derived likelihood function for the spectral parameters, which, we show, yields estimates equal to the maximum likelihood values of the full multi-dimensional data problem. We then use these estimates to perform the second step via the standard, generalized-least-square-like procedure. We demonstrate that the proposed approach is equivalent to a direct maximization of the full data likelihood, which is recast in a computationally tractable form. We use the corresponding curvature matrices to characterize statistical properties of the recovered parameters. We incorporate in the formalism some of the essential features of the CMB data sets, such as inhomogeneous pixel domain noise, unknown map offsets as well as calibration errors and study their consequences for the separation. We find that the calibration is likely to have a dominant effect on the precision of the spectral parameter determination for a realistic CMB experiment. We apply the algorithm to simulated data and discuss the results. Our focus is on partial-sky, total-intensity and polarization, CMB experiments such as planned balloon-borne and ground-based efforts, however, the techniques presented here should be also applicable to the full-sky data as for instance, those produced by WMAP and anticipated from Planck.
description: 18 pages, 8 figures, minor changes to match the published version
Superpotentials from variational derivatives rather than Lagrangians in relativistic theories of gravity
Creators: name: Katz, Joseph
name: Livshits, Gideon I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The prescription of Silva to derive superpotential equations from variational derivatives rather than from Lagrangian densities is applied to theories of gravity derived from Lovelock Lagrangians in the Palatini representation. Spacetimes are without torsion and isolated sources of gravity are minimally coupled. On a closed boundary of spacetime, the metric is given and the connection coefficients are those of Christoffel. We derive equations for the superpotentials in these conditions. The equations are easily integrated and we give the general expression for all superpotentials associated with Lovelock Lagrangians. We find, in particular, that in Einstein's theory, in any number of dimensions, the superpotential, valid at spatial and at null infinity, is that of Katz, Bicak and Lynden-Bell, the KBL superpotential. We also give explicitly the superpotential for Gauss-Bonnet theories of gravity. Finally, we find a simple expression for the superpotential of Einstein-Gauss-Bonnet theories with an anti-de Sitter background: it is minus the KBL superpotential, confirming, as it should, the calculation of the total mass-energy of spacetime at spatial infinity by Deser and Tekin.
description: Scheduled to appear in Class. Quantum Grav. August 2008
Infrared Emission from the Nearby Cool Core Cluster Abell 2597
Creators: name: Donahue, Megan
name: Jordan, Andres
name: Baum, Stefi A.
name: Cote, Patrick
name: Ferrarese, Laura
name: Goudfrooij, Paul
name: Macchetto, Duccio
name: O'Dea, Christopher P.
name: Pringle, James E.
name: Rhoads, James E.
name: Sparks, William B.
name: Voit, G. Mark
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We observed the brightest central galaxy (BCG) in the nearby (z=0.0821) cool core galaxy cluster Abell 2597 with the IRAC and MIPS instruments on board the Spitzer Space Telescope. The BCG was clearly detected in all Spitzer bandpasses, including the 70 and 160 micron wavebands. We report aperture photometry of the BCG. The spectral energy distribution exhibits a clear excess in the FIR over a Rayleigh-Jeans stellar tail, indicating a star formation rate of ~4-5 solar masses per year, consistent with the estimates from the UV and its H-alpha luminosity. This large FIR luminosity is consistent with that of a starburst or a Luminous Infrared Galaxy (LIRG), but together with a very massive and old population of stars that dominate the energy output of the galaxy. If the dust is at one temperature, the ratio of 70 to 160 micron fluxes indicate that the dust emitting mid-IR in this source is somewhat hotter than the dust emitting mid-IR in two BCGs at higher-redshift (z~0.2-0.3) and higher FIR luminosities observed earlier by Spitzer, in clusters Abell 1835 and Zwicky 3146.
description: Accepted at ApJ
Bauer-Furuta invariants under Z_2-actions
Creators: name: Nakamura, Nobuhiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57R57, 57S17 (Primary), 57M60 (Secondary)

description: S.Bauer and M.Furuta defined a stable cohomotopy refinement of the Seiberg-Witten invariants. In this paper, we prove a vanishing theorem of Bauer-Furuta invariants for 4-manifolds with smooth Z/2-actions. As an application, we give a constraint on smooth Z/2-actions on homotopy K3#K3, and construct a nonsmoothable locally linear Z/2-action on K3#K3. We also construct a nonsmoothable locally linear Z/2-action on $K3$.
description: 21 pages, typos corrected, several descriptions changed
Sharp Bounds for Optimal Decoding of Low Density Parity Check Codes
Creators: name: Kudekar, Shrinivas
name: Macris, Nicolas
Publisher: name: arXiv
Year: 2008
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Consider communication over a binary-input memoryless output-symmetric channel with low density parity check (LDPC) codes and maximum a posteriori (MAP) decoding. The replica method of spin glass theory allows to conjecture an analytic formula for the average input-output conditional entropy per bit in the infinite block length limit. Montanari proved a lower bound for this entropy, in the case of LDPC ensembles with convex check degree polynomial, which matches the replica formula. Here we extend this lower bound to any irregular LDPC ensemble. The new feature of our work is an analysis of the second derivative of the conditional input-output entropy with respect to noise. A close relation arises between this second derivative and correlation or mutual information of codebits. This allows us to extend the realm of the interpolation method, in particular we show how channel symmetry allows to control the fluctuations of the overlap parameters.
description: 40 Pages, Submitted to IEEE Transactions on Information Theory
Qualitative properties of coupled parabolic systems of evolution equations
Creators: name: Cardanobile, Stefano
name: Mugnolo, Delio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Functional Analysis (math.FA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 47D06, 35K45, 47D09

description: We apply functional analytical and variational methods in order to study well-posedness and qualitative properties of evolution equations on product Hilbert spaces. To this aim we introduce an algebraic formalism for matrices of sesquilinear mappings. We apply our results to parabolic problems of different nature: a coupled diffusive system arising in neurobiology, a strongly damped wave equation, a heat equation with dynamic boundary conditions, and a general semilinear Hodgkin--Huxley sytem.
Gluon shadowing in the Glauber-Gribov model at HERA
Creators: name: Arsene, I.
name: Bravina, L.
name: Kaidalov, A.
name: Tywoniuk, K.
name: Zabrodin, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We calculate shadowing using new data on the gluon density of the Pomeron recently measured with high precision at HERA. The calculations are made in a Glauber-Gribov framework and Pomeron tree-diagrams are summed up within a unitarity-conserving procedure. The total cross section of $\vphot A$ interaction is then found in a parameter-free description, employing gluon diffractive and inclusive distribution functions as input. A strong shadowing effect is obtained, in good agreement with several other models. Impact parameter dependence of gluon shadowing is also presented.
description: 18 pages, 6 figures; references added, discussion of model enlarged, calculation of low-x contribution corrected; to appear in Phys. Lett
A New Car-Following Model Inspired by Galton Board
Creators: name: Wang, Fa
name: Li, Li
name: Jin, Xuexiang
name: Hu, Jianming
name: Zhang, Yi
name: Ji, Yan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Different from previous models based on scatter theory and random matrix theory, a new interpretation of the observed log-normal type time-headway distribution of vehicles is presented in this paper. Inspired by the well known Galton Board, this model views driver's velocity adjusting process similar to the dynamics of a particle falling down a board and being deviated at decision points. A new car-following model based on this idea is proposed to reproduce the observed traffic flow phenomena. The agreement between the empirical observations and the simulation results suggests the soundness of this new approach.
Data analysis methods for the cosmic microwave background
Creators: name: Tristram, Matthieu
name: Ganga, Ken
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this review, we give an overview of some of the major aspects of data reduction and analysis for the cosmic microwave background (CMB). Since its prediction and discovery in the last century, the CMB radiation has proven itself to be one of our most valuable tools for precision cosmology. Recently, and especially when combined with complementary cosmological data, measurements of the CMB anisotropies have provided us with a wealth of quantitive information about the birth, evolution and structure of our Universe. We begin with a simple, general introduction to the physics of the CMB, including a basic overview of the experiments which record CMB data. The focus, however, will be the data analysis treatment of CMB data sets.
description: 41 pages, 21 figures
«De flores despojando el verde llano». Claudiano nella poesia barocca, da Faría a Góngora
Creators: name: Castaldo, Daria
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: Il lavoro di tesi indaga la presenza di Claudiano, ultimo epigono della classicità, nella poesia barocca spagnola. Muovendo dall’ampia circolazione della sua opera in età medievale e moderna, svolge uno studio della traduzione in ottave del "De raptu Proserpinae" ad opera di Francisco de Faría, letterato granadino, pubblicata nel 1608.  A seguire, attraverso l’analisi di numerosi loci similes, restituiti, in gran parte, dallo spoglio dei commenti secenteschi alla poesia di Gόngora, definisce, in termini d’intertestualità, il rapporto tra questi e Claudiano, sua sicura e frequente auctoritas di riferimento.
Uncertainty principle for Wigner-Yanase-Dyson information in semifinite von Neumann algebras
Creators: name: Gibilisco, Paolo
name: Isola, Tommaso
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mathematical Physics (math-ph)
subject: Operator Algebras (math.OA)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 62B10, 94A17 (Primary); 46L30, 46L60 (Secondary)

description: Recently Kosaki proved an uncertainty principle for matrices, related to Wigner-Yanase-Dyson information, and asked if a similar inequality could be proved in the von Neumann algebra setting. In this paper we prove such an uncertainty principle in the semifinite case.
Biogasanlagen in Baden-Württemberg
Creators: name: Oechsner, Hans
name: Weckenmann, Dieter
name: Buchenau, Carsten
Publisher: name: LANDTECHNIK
Year: 1998

description: ln Deutschland existieren mittlerweile und 375 landwirtschafliche Biogasanlagen[1]. Baden-Württemberg ist neben Bayern das Bundesland mit der höchsten Anlagendichte. Die meisten dieser Anlagen wurden durch öffentliche Mittel gefördert. Zur Ermittlung von verfahrenstechnischen Daten wurde die Landesanstalt vom Ministerium Ländlicher Raum Baden-Württemberg damit beauftragt, an allen bekannten Biogasanlagen im Land verfahrenstechnische Daten zu erheben. Die Evaluierung soll dazu beitragen, die Datenbasis im Bereich der landwirtschaftlichen Biogasanlagen für Baden-Württemberg zu vervollständigen. Durch eine Erfassung und Auswertung von Erfahrungswerten der Anlagenbetreiber wird für die Zukunft eine gezieltere Beratung und Planung möglich.
description: LANDTECHNIK, Bd. 53 Nr. 1 (1998)
Disciplina e profili di specialità del rapporto di lavoro dello straniero
Creators: name: Ambrosino, Antonio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: La ricerca ha ad oggetto la disciplina del rapporto di lavoro dello straniero. In essa, vengono analizzate, preliminarmente, le fonti internazionali delle migrazioni per motivi di lavoro, soppesandone la portata giuridica e, in particolare, il grado di vincolatività e coazione nei confronti dei soggetti destinatari, in quanto il contenuto di questi atti normativi - ovvero più specificamente paranormativi - non sempre raggiunge il crisma della giuridicità, ma si colloca nell’alveo del soft law. Un’analoga indagine viene condotta sulle politiche comunitarie in tema di immigrazione, da cui emerge la palese resistenza degli Stai membri a “comunitarizzare” il fenomeno attraverso la sua formale inclusione nelle materie di competenza del legislatore comunitario. Il lavoro dottorale, poi, appunta il suo interesse sull’ordinamento italiano, sviscerando principi e disciplina del lavoro dell’immigrato tra fonti di diverso livello: la Costituzione, la normativa nazionale, quella regionale ed alcune esperienze negoziali di natura collettiva. Specifica attenzione è rivolta alle problematiche endoprocedimentali relative al rilascio del nulla osta al lavoro, alle peculiarità formali e contenutistiche del contratto di soggiorno, nonché alla tipicità degli interessi pubblici coinvolti, i quali conferiscono al rapporto di lavoro dell’immigrato extracomunitario il carattere della specialità. L’elaborato, infine, si occupa di alcune problematiche applicative relative ai diritti del lavoratore immigrato in caso di recesso datoriale, anche alla luce delle recenti innovazioni, da parte della legge n. 92/2012, che hanno interessato la disciplina del licenziamento e l’ultrattività del permesso di soggiorno. Inoltre, parte della trattazione è dedicata alla tutela della salute e della sicurezza del lavoratore straniero nei luoghi di lavoro nonché agli strumenti di tutela in caso di discriminazione e, in particolare, alla speciale azione civile contro la discriminazione di cui all’art. 44 del T.U. sull’immigrazione, da ultimo modificato dalla d.lgs. n. 150/2011.
Combustion of extracted Rape Seeds
Creators: name: Kolomaznikova, Helena
name: Ondracek, Jaroslav
name: Skala, Zdenek
Publisher: name: LANDTECHNIK
Year: 1998

description: Larger utilization of rape oil for technical purposes increases the necessity to use the by-products from the oil pressing process. This by-product is extracte drape seed meal , which has a residual oil content of 2–3 %. Besides the utilization as foodstuff, it is necessary to find other ways of using of which one is for energy utilization. We solved the combustion of extracted rape seed meal. Essential fuel characteristics were found out and practical burning tests for emission determination releasing in their combustion were carried out. Gross calorific value of a standard sample (water content of 10 %, oil content of 2,6 %) is18,6 MJ/kg and calculated net calorificvalue is 17,1 MJ/kg. The combustion of extracted rape seeds in a boiler ARK 1000 with a fluid pre-combustor showed that it was possible to burn extracted seeds without any problems. All emission Iimits formulated by law were fulfilled, except the CO-contents in flue-gas caused by the bad technical state of the boiler.
description: LANDTECHNIK, Bd. 53 Nr. 1 (1998)