cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Polyolefins based hybrid nanocomposites
Creators: name: Pezzuto, Marilena
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: This thesis aimed at completing the study of the properties of iPP modified with an hydrogenated oligomer resin (Escorez-ESC) and at improving these properties by making nanocomposites with the addition of two clays (modified one 67G and unmodified one HPS) for possible use in the food packaging sector.
The study of the structure, morphology and thermal, rheological, mechanical and barrier properties of the binary and ternary systems have been reported as function of composition, kind of constituents and preparation conditions. Moreover for all the systems the study on crystallization in situ under shear and during cooling is reported.
 From the results obtained the main highlights can be draw: i) the iPP is not intercalated between clay layers. The clay 67G is well dispersed in the matrix (iPP and iPP/ESC blends), whereas HPS forms large agglomerates. ii) The iPP/ESC5%/67G presents similar mechanical properties to iPP and improved barrier properties respect to iPP, it could be a good starting point for investigations in order to use the ternary systems in the food packaging. For these systems the improvement of dispersion of the clay nanoparticles must be achieved by optimizing the preparation conditions and the mixing procedures. iii) The rheological results show that there is a good swelling of the clay HPS and the ESC. HPS should have a better affinity for the oligomer respect to iPP and should be dispersed more in this phase respect to iPP. At this point the modality of blending seems become very important. A masterbach made of Escorez and HPS could present structure intercalated/exfoliated. iv) the in-situ SAXS experiments have revealed that the temperature at which crystal growth rate is at a maxima is strongly dependent on the temperature at which the shear flow was applied. In the melt after shear flow, the polymer chains which were extended will be relaxing towards isotropic state. If crystallisation takes place before the chains are full relaxed, the extended chains acts as row nuclei which has 2 consequences. The first is a high level of common orientation of the crystals and second that crystallisation occurs at a higher temperatures, essential the chains are nucleating agents. As the polymer will crystallise in any event, the questions is really how much is directed by row nuclei and how much by randomly arrange nuclei. This changes the crystallisation temperature and the level of anisotropy. The clay platelet orientation is affected by flow but it does not template the crystallisation, although clearly the crystallisation behaviour depends on the details of the clay and other components.
PRISMA flow chart; Funnel plots of our three effects sizes: lnRR, d and d from Hard-working helpers contribute to long breeder lifespans in cooperative birds
Creators: name: Downing, Philip A.
name: Griffin, Ashleigh S.
name: Cornwallis, Charlie K.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences

description: In many species that raise young in cooperative groups, breeders live an exceptionally long time despite high investment in offspring production. How is this possible given the expected trade-off between survival and reproduction? One possibility is that breeders extend their lifespans by outsourcing parental care to non-reproductive group members. Having help lightens breeder workloads and the energy that is saved can be allocated to survival instead. We tested this hypothesis using phylogenetic meta-analysis across 23 cooperatively breeding bird species. We found that breeders with helpers had higher rates of annual survival than those without helpers (8% on average). Increased breeder survival was correlated with reduced investment in feeding offspring, which in turn depended on the proportion of feeding provided by helpers. Female and male breeders showed similar patterns. Our results indicate that one of the secrets to a long life is reduced investment in parental care. This appears to be a unique feature of cooperative societies with hard-working helpers.This article is part of the theme issue ‘Ageing and sociality: why, when and how does sociality change ageing patterns?’.
MPEC 2025-H114 : 2020 GD
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
The Chiral Model of Sakai-Sugimoto at Finite Baryon Density
Creators: name: Kim, Keun-Young
name: Sin, Sang-Jin
name: Zahed, Ismail
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the context of holographic QCD we analyze Sakai-Sugimoto's chiral model at finite baryon density and zero temperature. The baryon number density is introduced through compact D4 wrapping S^4 at the tip of D8-\bar{D8}. Each baryon acts as a chiral point-like source distributed uniformly over R^3, and leads a non-vanishing U(1)_V potential on the brane. For fixed baryon charge density n_B we analyze the bulk energy density and pressure using the canonical formalism. The baryonic matter with point like sources is always in the spontaneously broken phase of chiral symmetry, whatever the density. The point-like nature of the sources and large N_c cause the matter to be repulsive as all baryon interactions are omega mediated. Through the induced DBI action on D8-\bar{D8}, we study the effects of the fixed baryon charge density n_B on the pion and vector meson masses and couplings. Issues related to vector dominance in matter in the context of holographic QCD are also discussed.
description: V3: 39 pages, 16 figures, minor corrections, version to appear in JHEP. V2: references added, typos corrected
Floquet Graphene Antidot Lattices
Creators: name: Cupo, Andrew
name: Cobanera, Emilio
name: Whitfield, James D.
name: Ramanathan, Chandrasekhar
name: Viola, Lorenza
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We establish the theoretical foundation of the Floquet graphene antidot lattice, whereby massless Dirac fermions are driven periodically by a circularly polarized electromagnetic field, while having their motion excluded from an array of nanoholes. The properties of interest are encoded in the quasienergy spectra, which are computed non-perturbatively within the Floquet formalism. We find that a rich Floquet phase diagram emerges as the amplitude of the drive field is varied. Notably, the Dirac dispersion can be restored in real time relative to the gapped equilibrium state, which may enable the creation of an optoelectronic switch or a dynamically tunable electronic waveguide. As the amplitude is increased, the ability to shift the quasienergy gap between high-symmetry points can change which crystal momenta dominate in the scattering processes relevant to electronic transport and optical emission. Furthermore, the bands can be flattened near the $Γ$ point, which is indicative of selective dynamical localization. Lastly, quadratic and linear dispersions emerge in orthogonal directions at the $M$ point, signaling a Floquet semi-Dirac material. Importantly, all our predictions are valid for experimentally accessible near-IR radiation, which corresponds to the above bandwidth limit for the graphene antidot lattice. Cycling between engineered Floquet electronic phases may play a key role in the development of next-generation on-chip devices for optoelectronic applications.
Thermal Equilibrium as an Initial State for Quantum Computation by NMR
Creators: name: Fahmy, Amr F.
name: Marx, Raimund
name: Bermel, Wolfgang
name: Glaser, Steffen J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a method of using a nuclear magnetic resonance computer to solve the Deutsch-Jozsa problem in which: (1) the number of molecules in the NMR sample is irrelevant to the number of qubits available to an NMR quantum computer, and (2) the initial state is chosen to be the state of thermal equilibrium, thereby avoiding the preparation of pseudopure states and the resulting exponential loss of signal as the number of qubits increases. The algorithm is described along with its experimental implementation using four active qubits. As expected, measured spectra demonstrate a clear distinction between constant and balanced functions.
description: including 4 figures
Origin of "hot-spots" in the pseudogap regime of Nd(1.85)Ce(0.15)CuO(4): LDA+DMFT+Sigma_k study
Creators: name: Kokorina, E. E.
name: Kuchinskii, E. Z.
name: Nekrasov, I. A.
name: Pchelkina, Z. V.
name: Sadovskii, M. V.
name: Sekiyama, A.
name: Suga, S.
name: Tsunekawa, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Material specific electronic band structure of the electron-doped high-Tc cuprate Nd(1.85)Ce(0.15)CuO(4) (NCCO) is calculated within the pseudo gap regime, using the recently developed generalized LDA+DMFT+Sigma_k scheme. LDA/DFT (density functional theory within local density approximation) provides model parameters (hopping integral values, local Coulomb interaction strength) for the one-band Hubbard model, which is solved by DMFT (dynamical mean-field theory). To take into account pseudogap fluctuations LDA+DMFT is supplied with "external" k-dependent self-energy Sigma_k, which describes interaction of correlated conducting electrons with non-local Heisenberg-like antiferromagnetic (AFM) spin fluctuations responsible for pseudo gap formation. Within this LDA+DMFT+Sigma_k approach we demonstrate the formation of pronounced "hot-spots" on the Fermi surface (FS) map in NCCO, opposite to our recent calculations for Bi(2)Sr(2)CaCu(2)O(8-d) (Bi2212), which have produced rather extended region of FS "destruction". There are several physical reasons for this fact: (i) the "hot-spots" in NCCO are located closer to Brillouin zone center; (ii) correlation length of AFM fluctuations ξis larger for NCCO; (iii) pseudogap potential Δis stronger, than in Bi2212. Comparison of our theoretical data with recent bulk sensitive high-energy angle-resolved photoemission (ARPES) data for NCCO provides good semiquantitative agreement. Based on that comparison alternative explanation of the van-Hove singularity at -0.3 eV is proposed. Optical conductivity both for Bi2212 and NCCO is also calculated within LDA+DMFT+Sigma_k and compared with experimental results, demonstrating satisfactory agreement.
description: 8 pages, 10 figures, 1 table
Use of Stable Isotope Ratio Analysis (SIRA) for the identification of invasive species native in alien environments
Creators: name: Heinrich, Katharina
Publisher: name: Zenodo
Year: 2019
Subjects: Euphresco, plant health, Stable Isotope Ratios Analysis, surveillance, Anoplophora glabripennis, Monochamus

description: Slide of the Euphresco project 2017-A-250 'Use of Stable Isotope Ratio Analysis (SIRA) for the identification of invasive species native in alien environments'
description: Project funded through the Euphresco network
PEDAGOGICAL FOUNDATIONS OF THE QUALITY OF EDUCATION IN PRIMARY CLASSES AND ITS MANAGEMENT
Creators: name: Scientific supervisor: Begmatov Rakhimjon Rakhmankulovich Tashkent University of Applied Sciences Senior teacher of the "History" department
name: TAFU Faculty of Primary Education 1st grade student Murodjonova Shahzoda Elyor kizi
Publisher: name: Zenodo
Year: 2023

description: The article examines the importance of improving the methodical training and professional development of primary school teachers as a scientific-pedagogical problem and pedagogical foundations. It summarizes the opinions of foreign and local researchers. Based on the principles of professional development of primary school teachers, the quality of education in primary schools and the theoretical and pedagogical aspects of its management are scientifically based.

 

Key words: quality of education, pedagogical skills, lesson efficiency, methodical training.
WASP-1: A lithium- and metal-rich star with an oversized planet
Creators: name: Stempels, H. C.
name: Cameron, A. Collier
name: Hebb, L.
name: Smalley, B.
name: Frandsen, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper we present our results of a comprehensive spectroscopicanalysis of WASP-1, the host star to the exoplanet WASP-1b. We derive T_eff = 6110 +/- 45 K, log g = 4.28 +/- 0.15, and [M/H] = 0.23 +/- 0.08, and also a high abundance of lithium, log n(Li) = 2.91 +/- 0.05. These parameters suggests an age for the system of 1-3 Gyr and a stellar mass of 1.25-1.35 M_sun. This means that WASP-1 has properties very similar to those of HD 149026, the host star for the highest density planet yet detected. Moreover, their planets orbit at comparable distances and receive comparable irradiating fluxes from their host stars. However, despite the similarity of WASP-1 with HD 149026, their planets have strongly different densities. This suggests that gas-giant planet density is not a simple function of host-star metallicity or of radiation environment at ages of ~2 Gyr.
description: Accepted for publication in MNRAS. 6 pages, 4 figures
DESIGN AND SYNTHESIS OF NEW SELECTIVE CHEMOTHERAPEUTIC AGENTS
Creators: name: Paolella, Concetta
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: Synthesis of selective chemotherapeutic agents for antitumor and antiviral therapy purposes has been herein accomplished. Particularly, some novel molecular systems have been developed:
Folic acid based chlorambucil conjugates for selective antitumor treatments.
Folic acid based 5-aminolevulinic acid derivatives for photodynamic therapy of tumor cells.
4'-Substituted nucleosides and 2'3'-dihydro-1,4-dithiinyl nucleosides analogues for antiviral therapies.
Six-membered sugar based modified oligonucleotides: ribo-CNA, (ribo-Cyclohexanyl Nucleic Acids)for gene expression control.
Sensitivity to longitudinal vector boson scattering in semileptonic final states at the HL-LHC
Creators: name: Roloff, Jennifer
name: Cavaliere, Viviana
name: Pleier, Marc-André
name: Xu, Lailin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Longitudinal vector boson scattering provides an important probe of electroweak symmetry breaking, bringing sensitivity to physics beyond the Standard Model as well as constraining properties of the Higgs boson. It is a difficult process to study due to the small production cross section and challenging separation of the different polarization states. We study the sensitivity to longitudinal $WV$ vector boson scattering at the high-luminosity Large Hadron Collider in semileptonic final states. While these are characterized by larger background contributions compared to fully leptonic final states, they benefit from a higher signal cross section due to the enhanced branching fraction. We determine the polarization through full reconstruction of the event kinematics using the $W$ boson mass constraint and through the use of jet substructure. We show that with these techniques sensitivities around three standard deviations at the HL-LHC are achievable, which makes this channel competitive with its fully leptonic counterparts.
description: 21 pages, 7 figures, 3 tables
Supplementary Tables and Figures from How social behaviour and life-history traits change with age and in the year prior to death in female yellow-bellied marmots
Creators: name: Kroeger, Svenja B.
name: Blumstein, Daniel T.
name: Martin, Julien G. A.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 60801 Animal Behaviour
subject: FOS: Biological sciences

description: Studies in natural populations are essential to understand the evolutionary ecology of senescence and terminal allocation. While there are an increasing number of studies investigating late-life variation in different life-history traits of wild populations, little is known about these patterns in social behaviour. We used long-term individual based data on yellow-bellied marmots (Marmota flaviventer) to quantify how affiliative social behaviours and different life-history traits vary with age and in the last year of life, and how patterns compare between the two. We found that some social behaviours and all life-history traits varied with age, whereas terminal last year of life effects were only observed in life-history traits. Our results imply that affiliative social behaviours do not act as a mechanism to adjust allocation among traits when close to death, and highlight the importance of adopting an integrative approach, studying late-life variation and senescence across multiple different traits, to allow the identification of potential trade-offs.This article is part of the theme issue ‘Ageing and sociality: why, when and how does sociality change ageing patterns?’.
Classical to quantum transition of a driven nonlinear nanomechanical resonator
Creators: name: Katz, Itamar
name: Lifshitz, Ron
name: Retzker, Alex
name: Straub, Raphael
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Much experimental effort is invested these days in fabricating nanoelectromechanical systems (NEMS) that are sufficiently small, cold, and clean, so as to approach quantum mechanical behavior as their typical quantum energy scale $\hbarΩ$ becomes comparable to that of the ambient thermal energy $k_{B}T$. Such systems will hopefully enable one to observe the quantum behavior of human-made objects, and test some of the basic principles of quantum mechanics. Here we expand and elaborate on our recent suggestion [PRL 99 (2007) 040404] to exploit the nonlinear nature of a nanoresonator in order to observe its transition into the quantum regime. We study this transition for an isolated resonator, as well as one that is coupled to a heat bath at either zero or finite temperature. We argue that by exploiting nonlinearities, quantum dynamics can be probed using technology that is almost within reach. Numerical solutions of the equations of motion display the first quantum corrections to classical dynamics that appear as the classical-to-quantum transition occurs. This provides practical signatures to look for in future experiments with NEMS resonators.
Electromagnetic Models for the Retrieval of Surface Parameters through SAR Images
Creators: name: Natale, Antonio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: Nowadays, several private or public institutions require the knowledge of many ground physical parameters, i.e. permittivity, ground roughness, soil moisture content, vegetation biomass-index, and so on. In particular, the soil moisture content is a key parameter in the hydrological cycle and, moreover, it represents a fundamental information in several applications as in predicting rivers floods, rainfalls and landslides. In this thesis, a Polarimetric Two-Scale Model (PTSM), able to describe the scattering from a bare soil surface and to account for de-polarization and cross-polarization effects observed in real radar data, is presented. In particular, the model assumes the surface to be composed by rough randomly-tilted facets, which give rise to a random drift of the local incidence angle and a random rotation of the local incidence plane. Unlike other existing approaches, the PTSM accounts for both these effects - which come straight from the surface model – and allows us to compute the Normalized Radar Cross Sections (NRCS) for the whole surface by averaging over the facets slopes the power density scattered from a single facet. The prediction on the diffuse field provided by the NRCS is then employed in a co-polar cross-polar ratio based retrieval algorithm, from which it is possible to get maps of parameters from measured polarimetric Synthetic Aperture Radar (SAR) data. Accordingly, the retrieval procedure is performed on real data acquired at the same time of “in situ measurements”, both to test its performances and to provide the PTSM validation.
Moreover, an innovative interpretation of the Kirchhoff scattering integral is also provided: it regards the physical meaning of the Kirchhoff solution for the electromagnetic scattering from both classical and fractal surfaces.
Theoretical study of a localized quantum spin reversal by the sequential injection of spins in a spin quantum dot
Creators: name: Kokado, Satoshi
name: Ueda, Kazumasa
name: Harigaya, Kikuo
name: Sakuma, Akimasa
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This is a theoretical study of the reversal of a localized quantum spin induced by sequential injection of spins for a spin quantum dot that has a quantum spin. The system consists of ``electrode/quantum well(QW)/dot/QW/electrode" junctions, in which the left QW has an energy level of conduction electrons with only up-spin. We consider a situation in which up-spin electrons are sequentially injected from the left electrode into the dot through the QW and an exchange interaction acts between the electrons and the localized spin. To describe the sequentially injected electrons, we propose a simple method based on approximate solutions from the time-dependent Schr$\ddot{\rm o}$dinger equation. Using this method, it is shown that the spin reversal occurs when the right QW has energy levels of conduction electrons with only down-spin. In particular, the expression of the reversal time of a localized spin is derived and the upper and lower limits of the time are clearly expressed. This expression is expected to be useful for a rough estimation of the minimum relaxation time of the localized spin to achieve the reversal. We also obtain analytic expressions for the expectation value of the localized spin and the electrical current as a function of time. In addition, we found that a system with the non-magnetic right QW exhibits spin reversal or non-reversal depending on the exchange interaction.
description: 12 pages, 12 figures, to be published in Phys. Rev. B, typos corrected
Rischi, Governo delle trasformazioni urbane e Sostenibilità.
Una proposta d’integrazione tra Valutazione Ambientale Strategica e Analisi di Rischio
Creators: name: Profice, Andrea Salvatore
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: Il lavoro di Ricerca messo a punto nei tre anni del Dottorato svolti presso il Dipartimento di Pianificazione e
Scienza del Territorio, si inquadra in un filone teorico sviluppatosi in letteratura a partire dagli anni Ottanta
(Foster, 1980; Burby, 1998; Mileti, 1999), volto a ricondurre le “strategie di prevenzione e mitigazione dei
rischi naturali e tecnologici” all’interno dei “processi di pianificazione del territorio”, integrando entrambi
nella griglia teorica più ampia della “sostenibilità”. In relazione a tale filone – che ha posto le basi per una
teoria dell’integrazione tra “pianificazione”, “prevenzione e mitigazione dei rischi” e “sostenibilità” (cfr.
Godshalk, Kaiser e Berke, 1998) – e a fronte della maturata consapevolezza della necessità di una più stretta
interrelazione tra i suddetti elementi, diversi autori sottolineano l’importanza di individuare modalità,
tecniche e strumenti per integrare, da un punto di vista operativo, i valori di fondo del concetto di
sostenibilità nella pratica della pianificazione urbanistica e territoriale e nelle strategie di mitigazione dei
rischi. Dal ’98 ad oggi, diversi passi avanti sono stati fatti in questa direzione, soprattutto per quanto attiene
la relazione tra prevenzione e mitigazione dei rischi e pianificazione. A fronte di tale parziale evoluzione,
però, questo approccio integrativo non ha ancora prodotto soddisfacenti esiti operativi.
In relazione a quanto detto, l’apporto innovativo del lavoro proposto consiste nello sviluppo, in chiave
metodologico-operativa, della griglia teorica volta all’integrazione tra “governo del territorio”–“prevenzione
e mitigazione dei rischi”–“sostenibilità”, .
Fact and figure : the rhetoricity of the document
Creators: name: Plecash, Jan S.
Publisher: name: University of British Columbia
Year: 2010

description: The least remarked of sociological practices is the one without which its investigations would come to a standstill: the writing up of research results, both theoretical and substantive. This inattention is dependent upon a widely held view of writing as a technical apparatus which is more or less competently employed by researchers to represent those features of the social world with which they are concerned. The question addressed is whether and to what extent this commonplace commits sociology to a very old version of representation and a companion account of the true, which when expressed in other idioms are readily identified as problematic. With the aid of a type of analysis known as deconstruction, it is shown that a technical construal of writing is inseparable from and indispensable to the construction of fact, and thus to the very idea of documentation as a sheerly mimetic or descriptive relation of writing to a referent. The idea of a document is accordingly treated as the most powerful expression of a largely unacknowledged system of sense-making organizing sociological discourse.
Spettrometro e la segnatura muonica dell'esperimento OPERA
Creators: name: Di Troia, Claudio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: OPERA è un esperimento in fase di installazione presso i Laboratori Nazionali del Gran Sasso che investiga sulla apparizione di neutrino tauonico generato per oscillazione di sapore da un fascio di neutrini muonici inviati dal CERN verso il Gran Sasso: il fascio di long baseline CNGS.  OPERA è dotato di 2 spettrometri per l'identificazione dei muoni, la determinazione del momento e l'assegnazione della carica. Sono riportati i risultati dello studio delle proprietà e delle performance degli spettrometri. Per il magnete dipolare sono mostrate le  proprietà chimiche, meccaniche e magnetiche; le mappe di campo magnetico atteso sono state simulate e viene descritto come il campo magnetico possa venir monitorato durante la presa dati. Sono descritti i test (i controlli di qualità) eseguiti sui Resistive Plate Chambers, i rivelatori traccianti all'interno del magnete. I test hanno selezionato gli RPC con adeguate proprieta' meccaniche (tramite test pneumatici) ed elettriche (tramite test di condizionamento).  Dalla misura dell'efficienza e delle mappe di rumore (ottenute da un test che li sottoponeva ai raggi cosmici) solo i migliori RPC sono stati impiegati per lo Spettrometro di cui si documenta l'installazione ai LNGS. Sfruttando l'efficienza dello Spettrometro si è  svolta una simulazione dell'esperimento per dedurre come OPERA sia in grado di  monitorare il fascio di neutrini. La ricostruzione e l'intensità dello spettro CNGS è ottenuta arricchendo la statistica dei i vertici di interazione di corrente carica neutrino-materia  generati nella roccia del complesso del Gran Sasso che circonda OPERA.
alpha-particle production in the scattering of 6He by 208Pb at energies around the Coulomb barrier
Creators: name: Escrig, D.
name: Sanchez-Benitez, A. M.
name: Moro, A. M.
name: Alvarez, M. A. G.
name: Andres, M. V.
name: Angulo, C.
name: Borge, M. J. G.
name: Cabrera, J.
name: Cherubini, S.
name: Demaret, P.
name: Espino, J. M.
name: Figuera, P.
name: Freer, M.
name: Garcia-Ramos, J. E.
name: Gomez-Camacho, J.
name: Gulino, M.
name: Kakuee, O. R.
name: Martel, I.
name: Metelko, C.
name: Perez-Bernal, F.
name: Rahighi, J.
name: Rusek, K.
name: Smirnov, D.
name: Tengblad, O.
name: Ziman, V.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: New experimental data from the scattering of 6He+208Pb at energies around and below the Coulomb barrier are presented. The yield of breakup products coming from projectile fragmentation is dominated by a strong group of $α$ particles. The energy and angular distributions of this group have been analyzed and compared with theoretical calculations. This analysis indicates that the $α$ particles emitted at backward angles in this reaction are mainly due to two-neutron transfer to weakly bound states of the final nucleus.
description: 20 pages, 5 figures. Nuclear Physics A792 (2007) 2-17
Supplementary Table1: ANOVA II results from Queen loss increases worker survival in leaf-cutting ants under paraquat-induced oxidative stress
Creators: name: Majoe, Megha
name: Libbrecht, Romain
name: Foitzik, Susanne
name: Nehring, Volker
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology
subject: 60801 Animal Behaviour

description: Longevity is traded off with fecundity in most solitary species, but the two traits are positively linked in social insects. The most fecund individuals (queens and kings) live longer than the non-reproductive individuals, the workers. In many species, workers may become fertile following queen loss, and recent evidence suggests that worker fecundity extends worker lifespan. We postulated that this effect is in part due to improved resilience to oxidative stress, and tested this hypothesis in three Myrmicine ants: Temnothorax rugatulus, and the leaf-cutting ants Atta colombica and Acromyrmex echinatior. We removed the queen from colonies to induce worker reproduction and subjected workers to oxidative stress. Oxidative stress drastically reduced survival, but this effect was less pronounced in leaf-cutting ant workers from queenless nests. We also found that, irrespective of oxidative stress, outside workers died earlier than inside workers did, likely because they were older. Since At. colombica workers cannot produce fertile offspring, our results indicate that direct reproduction is not necessary to extend the lives of queenless workers. Our findings suggest that workers are less resilient to oxidative stress in the presence of the queen, and raise questions on the proximate and ultimate mechanisms underlying socially mediated variation in worker lifespan.This article is part of the theme issue ‘Ageing and sociality: why, when and how does sociality change ageing patterns?’.
Un approccio metodologico per i Piani Operativi di Acquisto: un case-study in un’azienda elettronica italiana
Creators: name: Ritucci, Maria Antonietta
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: Le diverse tappe che hanno caratterizzato l’evoluzione delle metodologie di gestione degli approvvigionamenti, hanno visto una forte variabilità nel numero di relazioni cliente/fornitore gestite da un’azienda. In generale, si è assistito ad un processo via via crescente di riduzione del parco fornitori e alla trasformazione delle relazioni cliente/fornitore in “rapporti evoluti”; ciò ha comportato che la riduzione della base di fornitura delle aziende non è stata affiancata da un’uguale riduzione del numero di risorse interessate nel processo di gestione, ma piuttosto un loro aumento in numero e in competenze richieste. Nasce, così, da parte dell’azienda, la necessità di identificare, per ciascun fornitore, la modalità di gestione della relazione più appropriata; più tipicamente si assiste ad un “portafoglio” di approcci che l’azienda attua.
Questa ricerca ha lo scopo individuare i fattori che influiscono sulla scelta delle politiche di acquisto più adeguate, e di definire uno strumento operativo per la gestione del portafoglio delle relazioni cliente/fornitore, che possa essere quindi di supporto pratico alle decisioni del management aziendale.
I modelli di riferimento individuati nella review letteraria sono quelli di gestione del portafoglio delle relazioni cliente/fornitore elaborati da Kraljic [1987] e da Olsen ed Ellram [1993], il cui scopo comune è di definire delle politiche differenziate di gestione, focalizzandosi su driver diversi, tipici della fornitura per il primo, della relazione cliente/fornitore per il secondo. L’analisi critica dei modelli ha evidenziato come le diverse politiche di acquisto adottate da un’azienda non possono dipendere solo dalle caratteristiche della fornitura o solo da quelle della relazione, ma da una combinazione delle stesse.
Il modello elaborato, pertanto, pur mantenendo l’approccio e gli assunti di base dei modelli di riferimento, utilizza, come driver di analisi, la fornitura e la relazione; la sua formulazione è stata effettuata in due step: l’individuazione delle dimensioni rilevanti per la classificazione dei driver; la definizione di una politica di gestione della stessa. Il modello si configura come una mappa [Piani Operativi di Acquisto] nella quale è possibile identificare la politica di gestione ottimale a partire dalla valorizzazione delle dimensioni di analisi.
Il modello è stato testato attraverso un case-study sviluppato presso un’azienda elettronica italiana. La fase di test ha permesso di validare le ipotesi effettuate in fase di ricerca e le assunzioni alla base del modello stesso, che erano state tratte da studi condotti in un settore (quello automobilistico) con caratteristiche diverse da quello utilizzato nel case-study; l’applicazione, inoltre, ha permesso la valutazione dell’efficacia del modello stesso e la sua valenza dal punto di vista operativo, e non solo teorico.
Pseudomagnetic fields and ballistic transport in a suspended graphene sheet
Creators: name: Fogler, M. M.
name: Guinea, F.
name: Katsnelson, M. I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study a suspended graphene sheet subject to the electric field of a gate underneath. We compute the elastic deformation of the sheet and the corresponding effective gauge field, which modifies the electronic transport. In a clean system the two-terminal conductance of the sample is reduced below the ballistic limit and is almost totally suppressed at low carrier concentrations in samples under tension. Residual disorder restores a small finite conductivity.
description: 4 pages
Adaptive Beam Design for V2I Communications using Vehicle Tracking with Extended Kalman Filter
Creators: name: Hyun, Seong-Hwan
name: Song, Jiho
name: Kim, Keunwoo
name: Lee, Jong-Ho
name: Kim, Seong-Cheol
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Vehicle-to-everything communication system is a strong candidate for improving the driving experience and automotive safety by linking vehicles to wireless networks. To take advantage of the full benefits of vehicle connectivity, it is essential to ensure a stable network connection between roadside unit (RSU) and fast-moving vehicles. Based on the extended Kalman filter (EKF), we develop a vehicle tracking algorithm to enable reliable radio connections. For the vehicle tracking algorithm, we focus on estimating the rapid changes in the beam direction of a high-mobility vehicle while reducing the feedback overhead. Furthermore, we design a beamforming codebook that considers the road layout and RSU. By leveraging the proposed beamforming codebook, vehicles on the road can expect a service quality similar to that of conventional cellular services. Finally, a beamformer selection algorithm is developed to secure sufficient gain for the system's link budget. Numerical results verify that the EKF-based vehicle tracking algorithm and the proposed beamforming structure are more suitable for vehicle-to-infrastructure networks compared to existing schemes.
description: 14 pages, 11 figures, accepted to IEEE Transactions on Vehicular Technology
Technical efficiency and farm size: an analysis based on the Brazilian agriculture and livestock census
Creators: name: De Freitas, Carlos Otavio
name: Teixeira, Erly Cardoso
name: Braga, Marcelo Jose
name: Schuntzemberger, Amanda Massaneira De Souza
Publisher: name: Italian Review of Agricultural Economics
Year: 2019

description: This paper analyzes the relationship between technical efficiency and farm size, considering different classes of area and efficiency levels in Brazil. Stochastic Frontier Production was used to obtain the technical efficiency and the Quantile Regression was used to identify their determinants. Microdata from the 2006 Brazilian Agriculture Census were used. It was found a positive and non-linear relationship between farm size and efficiency in all area classes. However, the more efficient the producers, the weaker the relationship, which indicates that such producers were less dependent on the land factor. In addition, irrigation, technical assistance and cooperatives membership were the factors which contributed most to increasing efficiency, especially for the less efficient producers.
description: Italian Review of Agricultural Economics, Vol 74 No 1 (2019)
The housing consumption of empty nest households
Creators: name: Weikum, Gary Lester
Publisher: name: University of British Columbia
Year: 2010

description: The purposes of this study are to develop a demographic profile of empty nesters and describe their housing consumption; to determine the number of empty nesters who are occupying family housing; and provide a summary of the housing needs of empty nesters which cause them to occupy the type of housing which they do. This study is not intended to develop public policy to encourage empty nesters to move, rather, it attempts to answer some fundamental questions about the impact of empty nesters on the family housing supply in urban areas. A detailed examination of empty nester housing consumption in the Vancouver, C.M.A. Canada was conducted through analysis of 1981 Census Canada Public Use Sample Tapes. The findings indicate that empty nesters have a high propensity to live independently in owner-occupied family type single detached dwellings. Contrary to popular perception, condominiums have not attracted large numbers of empty nest couples. Empty nesters appear to retain their independent living arrangements and family type housing for as long as possible. Income, more than any other variable tested, influences the size of dwelling occupied by this group., and relatively low monthly housing costs caused by high equity situations may counteract any desire to economize space after the children have left the family home. This study was conducted as a result of the apparent lack of empirical data regarding empty nesters and the various assumptions that they were contributing to family housing shortage problems. It is important that researchers not pre-judge what is adequate housing for empty nesters. Rather, researchers should focus on the resources and needs of this group and attempt to supply appropriate housing from this direction rather than implement policies to get them out of their current housing units.
Extracting the hierarchical organization of complex systems
Creators: name: Sales-Pardo, M.
name: Guimera, R.
name: Moreira, A.
name: Amaral, L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Extracting understanding from the growing ``sea'' of biological and socio-economic data is one of the most pressing scientific challenges facing us. Here, we introduce and validate an unsupervised method that is able to accurately extract the hierarchical organization of complex biological, social, and technological networks. We define an ensemble of hierarchically nested random graphs, which we use to validate the method. We then apply our method to real-world networks, including the air-transportation network, an electronic circuit, an email exchange network, and metabolic networks. We find that our method enables us to obtain an accurate multi-scale descriptions of a complex system.
description: Figures in screen resolution. Version with full resolution figures available at http://amaral.chem-eng.northwestern.edu/Publications/Papers/sales-pardo-2007.pdf
Design and Performance of a Practical Variable-Temperature Scanning Tunneling Potentiometry System
Creators: name: Rozler, M.
name: Beasley, M. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We have constructed a scanning tunneling potentiometry system capable of simultaneously mapping the transport-related electrochemical potential of a biased sample along with its surface topography. Combining a novel sample biasing technique with a continuous current-nulling feedback scheme pushes the noise performance of the measurement to its fundamental limit - the Johnson noise of the STM tunnel junction. The resulting 130 nV voltage sensitivity allows us to spatially resolve local potentials at scales down to 2 nm, while maintaining angstrom scale STM imaging, all at scan sizes of up to 15 um. A mm-range two-dimensional coarse positioning stage and the ability to operate from liquid helium to room temperature with a fast turn-around time greatly expand the versatility of the instrument. By performing studies of several model systems, we discuss the implications of various types of surface morphology for potentiometric measurements.
description: 16 pages, 17 figures, accepted to Review of Scientific Instruments v2 - minor changes: cleaned up figures/figure captions
Significance of the strain-dominated region around a vortex on induced aerodynamic loads
Creators: name: Menon, Karthik
name: Mittal, Rajat
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The ability of vortices to induce aerodynamic loads on proximal surfaces plays a significant role in a wide variety of flows. However, most studies of vortex-induced effects primarily focus on analyzing the influence of the rotation-dominated cores of vortices. In this work, we show that not only are vortices in viscous flows surrounded by strain-dominated regions, but that these regions are dynamically important and can sometimes even dictate the induced aerodynamic loads. We demonstrate this for a pitching airfoil, which exhibits dynamic stall and generates several force-inducing vortices. Using a data-driven force partitioning method, we quantify the influence of vortices as well as vortex-associated strain to show that our current understanding of vortex-dominated phenomena, such as dynamic stall, is incomplete without considering the substantial effect of strain-dominated regions that are associated with vortices.
Supplementary information for 'Characterizing stochastic resonance in a triple cavity'
Creators: name: Ruoxing Mei
name: Xu, Yong
name: Yongge Li
name: Kurths, Jürgen
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 10299 Applied Mathematics not elsewhere classified
subject: FOS: Mathematics
subject: 20304 Thermodynamics and Statistical Physics
subject: FOS: Mechanical engineering

description: Many biological systems possess confined structures, which produce novel influences on the dynamics. Here, stochastic resonance (SR) in a triple cavity that consists of three units and is subjected to noise, periodic force and vertical constance force is studied, by calculating the spectral amplification ηηηηηThis article is part of the theme issue ‘Vibrational and stochastic resonance in driven nonlinear systems (part 2)’.
Doping evolution of itinerant magnetic excitations in Fe-based oxypnictides
Creators: name: Korshunov, M. M.
name: Eremin, I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Employing the four-band tight-binding model we study theoretically the doping dependence of the spin response in the normal state of novel Fe-based pnictide superconductors. We show that the commensurate spin density wave (SDW) transition that arises due to interband scattering between the hole $α$-pockets and the electron $β$-pockets disappears already at the doping concentration $x \approx 0.04$ reflecting the evolution of the Fermi surfaces. Correspondingly, with further increase of the doping the antiferromagnetic fluctuations are suppressed for $x > 0.1$ and the Im$χ({\bf Q_{AFM}},ω)$ becomes nearly temperature independent. At the same time, we observe that the uniform susceptibility deviates from the Pauli-like behavior and is increasing with increasing temperature reflecting the activation processes for the $α$-Fermi surfaces up to temperatures of about T=800K. With increase of the doping the absolute value of the uniform susceptibility lowers and its temperature dependence changes. In particular, it is a constant at low temperatures and then decreases with increasing temperature. We discuss our results in a context of recent experimental data.
description: 5 pages, accepted in EPL
Investment returns from hybrid poplar plantations in northern Italy between 2001 and 2016: are we losing a bio-based segment of the primary economy?
Creators: name: Pra, Alex
name: Pettenella, Davide
Publisher: name: Italian Review of Agricultural Economics
Year: 2019

description: This work estimated financial returns at aggregate level from hybrid poplar plantations in northern Italy between 2001 and 2016. The results suggest that poplar can represent one of the most profitable investments among forest plantations in Europe, although the range of potential returns is rather large, including negative returns. The decrease of expected returns over the last 15 years has negatively undermined the attractiveness for new investments, increasing the market risk component. We also assessed the effects of external variables such as public subsidies, land cost, opportunity cost, and insurance cost. Land use and opportunity costs appear to be crucial variables, as well as public subsidies, which have undergone substantial changes over the period.
description: Italian Review of Agricultural Economics, Vol 74 No 1 (2019)