cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dimensions and Clusters of Aesthetic Emotions: A Semantic Profile Analysis
Creators: name: Beermann, Ursula
name: Hosoya, Georg
name: Schindler, Ines
name: Scherer, Klaus R.
name: Eid, Michael
name: Wagner, Valentin
name: Menninghaus, Winfried
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: aesthetic emotions
subject: dimensional structure
subject: emotion word clusters
subject: affective meaning
subject: semantic profiles
subject: 100 Philosophie und Psychologie::150 Psychologie::150 Psychologie

description: Aesthetic emotions are elicited by different sensory impressions generated by music, visual arts, literature, theater, film, or nature scenes. Recently, the AESTHEMOS scale has been developed to facilitate the empirical assessment of such emotions. In this article we report a semantic profile analysis of aesthetic emotion terms that had been used for the development of this scale, using the GRID approach. This method consists of obtaining ratings of emotion terms on a set of meaning facets (features) which represent five components of the emotion process (appraisal, bodily reactions, action tendencies, expression, and feelings). The aims here were (a) to determine the dimensionality of the GRID features when applied to aesthetic emotions and compare it to published results for emotion terms in general, and (b) to examine the internal organization of the domain of aesthetic emotion terms in order to identify salient clusters of these items based on the similarity of their feature profiles on the GRID. Exploratory Principal Component Analyses suggest a four-dimensional structure of the semantic space consisting of valence, power, arousal, and novelty, converging with earlier GRID studies on large sets of standard emotion terms. Using cluster analyses, 15 clusters of aesthetic emotion terms with similar GRID feature profiles were identified, revealing the internal organization of the aesthetic emotion terms domain and meaningful subgroups of aesthetic emotions. While replication for further languages is required, these findings provide a solid basis for further research and methodological development in the realm of aesthetic emotions.
Kinematics and extent of the Piemont–Liguria Basin – implications for subduction processes in the Alps
Creators: name: Le Breton, Eline
name: Brune, Sascha
name: Ustaszewski, Kamil
name: Zahirovic, Sabin
name: Seton, Maria
name: Müller, R. Dietmar
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Piemont-Liguria Basin
subject: kinematics
subject: subduction processes
subject: 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften

description: Assessing the size of a former ocean of which only remnants are found in mountain belts is challenging but crucial to understanding subduction and exhumation processes. Here we present new constraints on the opening and width of the Piemont–Liguria (PL) Ocean, known as the Alpine Tethys together with the Valais Basin. We use a regional tectonic reconstruction of the Western Mediterranean–Alpine area, implemented into a global plate motion model with lithospheric deformation, and 2D thermo-mechanical modeling of the rifting phase to test our kinematic reconstructions for geodynamic consistency. Our model fits well with independent datasets (i.e., ages of syn-rift sediments, rift-related fault activity, and mafic rocks) and shows that, between Europe and northern Adria, the PL Basin opened in four stages: (1) rifting of the proximal continental margin in the Early Jurassic (200–180 Ma), (2) hyper-extension of the distal margin in the Early to Middle Jurassic (180–165 Ma), (3) ocean–continent transition (OCT) formation with mantle exhumation and MORB-type magmatism in the Middle–Late Jurassic (165–154 Ma), and (4) breakup and mature oceanic spreading mostly in the Late Jurassic (154–145 Ma). Spreading was slow to ultra-slow (max. 22 mm yr−1, full rate) and decreased to ∼5 mm yr−1 after 145 Ma while completely ceasing at about 130 Ma due to the motion of Iberia relative to Europe during the opening of the North Atlantic. The final width of the PL mature (“true”) oceanic crust reached a maximum of 250 km along a NW–SE transect between Europe and northwestern Adria. Plate convergence along that same transect has reached 680 km since 84 Ma (420 km between 84–35 Ma, 260 km between 35–0 Ma), which greatly exceeds the width of the ocean. We suggest that at least 63 % of the subducted and accreted material was highly thinned continental lithosphere and most of the Alpine Tethys units exhumed today derived from OCT zones. Our work highlights the significant proportion of distal rifted continental margins involved in subduction and exhumation processes and provides quantitative estimates for future geodynamic modeling and a better understanding of the Alpine Orogeny.
Stratigraphy and Structure of the Southern Myally Block, Mount Isa Inlier, Queensland.
Creators: name: Baston, Richard Arthur
Publisher: name: Monash University
Year: 2019
Subjects: subject: 49999 Earth Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences

description: The oldest sedimentary unit exposed on the southern Myally Block is the 1050m thick Quilalar Formation, which overlies the Kalkadoon Granite and Leichhardt Volcanics. Deposition was in a marine environment. Sea-level variations were responsible for alternating periods of shelf and shoreface conditions during deposition or the lower portion. A decrease in siltstone and an increase in sandy and stromatolitic carbonate in the upper portion represents the establishment of shallower marine or lagoonal conditions. These conditions are laterally extensive, and the formation has therefore been interpreted as a sagphase sequence, deposited after a period of crustal extension. […]
Exploring the Aoki regime
Creators: name: Akemann, Gernot
name: Pucci, Fabrizio
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We compute next-to-leading order (NLO) corrections in the ε-regime of Wilson (WChPT) and Staggered Chiral Perturbation Theory (SChPT). A difference between the two is that in WChPT already at NLO, that is at O(ε^2), new low energy constants (LECs) contribute, whereas in SChPT they only enter at O(ε^4). We first determine the NLO corrections in WChPT for SU(2), and for U(N_f) at fixed index. This implies finite-volume corrections to the phase boundary between the Aoki phase and the Sharpe-Singleton scenario via corrections to the mean field potential. We also compute NLO corrections to the two-point function in the scalar and pseudo-scalar sector in WChPT. Turning to SChPT we determine the NLO corrections to the LECs and their effect on the taste splitting. Here the NLO partition function can be written as the leading order one with renormalized couplings, thus preserving the equivalence to staggered chiral random matrix theory at NLO for any number of flavors N_f. In WChPT this relation only appears to hold for SU(2).
description: 32 pages, 6 figures, 4 tables, v2: Published version
Seasonal prediction of Indian summer monsoon onset with echo state networks
Creators: name: Mitsui, Takahito
name: Boers, Niklas
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Indian Summer monsoon onset
subject: seasonal prediction
subject: artificial neural network
subject: echo state network
subject: 500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie::550 Geowissenschaften

description: Although the prediction of the Indian Summer Monsoon (ISM) onset is of crucial importance for water-resource management and agricultural planning on the Indian sub-continent, the long-term predictability—especially at seasonal time scales—is little explored and remains challenging. We propose a method based on artificial neural networks that provides skilful long-term forecasts (beyond 3 months) of the ISM onset, although only trained on short and noisy data. It is shown that the meridional tropospheric temperature gradient in the boreal winter season already contains the signals needed for predicting the ISM onset in the subsequent summer season. Our study demonstrates that machine-learning-based approaches can be simultaneously helpful for both data-driven prediction and enhancing the process understanding of climate phenomena.
Enhancing Access To Audio Video Collections Of Raman Research Institute Library Through Digitization
Creators: name: M N Nagaraj
name: Vrinda J Benegal
name: M K Bhandi
Publisher: name: Zenodo
Year: 2014

description: The digitization of library non-book materials has become essential as it enhances accessibility through internet. Library of Raman Research Institute (RRI) took digitization of audio and Video (AV) collection in the year 2000. The main objective is to enhance the access to inaccessible resources. As such retaining AV documents in their original format has problems of storage since they are vulnerable to usage and climatic changes. Due to frequent change in the physical format of AV materials, it becomes unreadable because of non-availability of reading devices. An effort has been made to show how different measures have been adopted to circumvent various problems. Initially metadata was created to provide access through library catalogue. Since, it was not enough to get full content of resources; library went for converting AV collection to CD format. CDs are very sensitive to scratches and multiuser access is restricted. To resolve these problems, library at RRI has adopted digitization of multimedia documents. This is to illustrate how digitized AV collections are showcased in RRI intranet and on the web for wider accessibility
Higher-Derivative Chiral Superfield Actions Coupled to N=1 Supergravity
Creators: name: Koehn, Michael
name: Lehners, Jean-Luc
name: Ovrut, Burt A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We construct N=1 supergravity extensions of scalar field theories with higher-derivative kinetic terms. Special attention is paid to the auxiliary fields, whose elimination leads not only to corrections to the kinetic terms, but to new expressions for the potential energy as well. For example, a potential energy can be generated even in the absence of a superpotential. Our formalism allows one to write a supergravity extension of any higher-derivative scalar field theory and, therefore, has applications to both particle physics and cosmological model building. As an illustration, we couple the higher-derivative DBI action describing a 3-brane in 6-dimensions to N=1 supergravity. This displays a number of new features-- including the fact that, in the regime where the higher-derivative kinetic terms become important, the potential tends to be everywhere negative.
description: 37 pages, v2: references added
The facies architecture and geochronology of the subaerial to subaqueous Palaeoproterozoic El Sherana Group, Northern Territory, and the submarine Early Devonian Crudine Group, New South Wales: implications for eruption and depositional processes.
Creators: name: Jagodzinski, Elizabeth Anne
Publisher: name: Monash University
Year: 2019
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: The El Sherana Group is a succession of fluvial and lacustrine sedimentary rocks and bimodal volcanics outcropping in a NW-trending faulted belt in the South Alligator Valley area of the Proterozoic Pine Creek Inlier, Northern Territory, Australia. The El Sherana Group comprises, in ascending stratigraphic order, the Scinto Breccia, Coronation Sandstone, Pu! Pu! Rhyolite and Big Sunday Formation. The Pu! Pu! Rhyolite represents a major period of silicic volcanism during deposition of the El Sherana Group. It contains an association of rhyolitic volcanic, volcaniclastic and intrusive facies, dominated by welded ignimbrites. The volcanic succession is thickest (over I km thick) around the southern margin of the Malone Creek Granite, thinning to under 200m to the northwest, where it outcrops discontinuously throughout the South Alligator Valley Mineral Field, and around the base of the Mt Callanan Basin. In the southeast, where the formation is thickest, the Pul Pul Rhyolite is disconformably overlain by the Big Sunday Formation, a succession of volcaniclastic turbidites interpreted to represent a local lacustrine environment in the predominantly subaerial palaeo-landscape.
The thick volcanic succession south of the Malone Creek Granite is interpreted to represent the preserved remnant of an ancient caldera structure that developed incrementally through partial collapse in the early stages of eruption, followed by downsagging in the later stages. The thinner succession to the northwest is interpreted to represent the associated outflow (i.e. extracaldera) deposits. The position of the caldera margin between the proximal and distal deposits is marked by a series of faults, including an early collapse scarp interpreted as a preserved remnant of the early caldera margin, which correspond spatially to a significant
change in the thickness of the ignimbrite succession. sparsely porphyritic quartz monzonite porphyries at this locality may correspond to a ring dyke associated with this fracture system. Because the Big Sunday Formation overlies the intracaldera facies, it is interpreted to have accumulated within the topographic depression remaining after caldera collapse. The spatial relationship between the Pu! Pu! Rhyolite and the central Malone Creek Granite pluton suggests that late-stage resurgence of the volcanic pile accompanied emplacement of the granite.[...]
On sets of numbers rationally represented in a rational base number system
Creators: name: Marsault, Victor
name: Sakarovitch, Jacques
Publisher: name: arXiv
Year: 2012
Subjects: subject: Formal Languages and Automata Theory (cs.FL)
subject: FOS: Computer and information sciences

description: In this work, it is proved that a set of numbers closed under addition and whose representations in a rational base numeration system is a rational language is not a finitely generated additive monoid. A key to the proof is the definition of a strong combinatorial property on languages : the bounded left iteration property. It is both an unnatural property in usual formal language theory (as it contradicts any kind of pumping lemma) and an ideal fit to the languages defined through rational base number systems.
Structure and Thermal Evolution of Exoplanetary Cores
Creators: name: Bonati, Irene
name: Lasbleis, Marine
name: Noack, Lena
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: exoplanets
subject: planetary cores
subject: planetary evolution
subject: planetary interiors
subject: magnetic field
subject: 500 Naturwissenschaften und Mathematik::520 Astronomie::520 Astronomie und zugeordnete Wissenschaften

description: Most of the large rocky bodies in the solar system display evidence of past and/or current magnetic activity, driven by thermochemical convection in an electrically conducting fluid layer. The discovery of a large number of extrasolar planets motivates the search for magnetic fields beyond the solar system. While current observations are limited to providing planetary radii and minimum masses, studying the evolution of exoplanets' magnetic fields and their interaction with the atmosphere can open new avenues for constraining interior properties from future atmospheric observations. Here, we investigate the evolution of massive rocky planets (0.8 − 2 MEarth) with different bulk and mantle iron contents. Starting from their temperature profiles after accretion, we determine the structure of the core and model its subsequent thermal and magnetic evolution over 5 Gyr. We find that the planetary iron inventory and distribution strongly affect core structure, evolution, and the lifetime of a magnetic field. Planets with large bulk and mantle iron contents tend to feature large solid inner cores, which can grow up to the liquid outer core radius, shutting down any pre-existing magnetic activity. Consequently, the longest dynamo lifetimes (∼ 4.25 Gyr) are obtained for massive planets with intermediate iron inventories. The smaller inner core radii and the chemical buoyancy fluxes introduced by the presence of light impurities can extend the magnetic field lifetimes to more than 5 Gyr. While the calculated magnetic fields are too weak to be detected by ground facilities, indirect observations may provide valuable insights into exoplanetary dynamos.
E-XQR-30: The cosmic evolution of MgII, CII and OI
Creators: name: Sebastian, Alma Maria
Publisher: name: Zenodo
Year: 2023

description: The chemical build-up in the Universe is one of the major factors behind the evolution of galaxy populations across cosmic time. The metals ejected into the surrounding media through galactic feedback processes and the nature of ionising radiation shaped the galaxies as we see them in the present epoch. Studying evolution of metal absorbers across redshift, thus, provides valuable hints to the way the galaxy populations transformed across different epochs. Previous works on metal absorbers have used their number density statistics to infer various properties of the absorber galaxies such as galaxy halo size, metallicity, star formation rate, feedback processes and the nature of ionising radiation. The ESO VLT Large Program, the "Ultimate XSHOOTER legacy survey of quasars at z ranging from 5.8 − 6.6″ (XQR-30) has quadrupled the number of z~6 quasars with deep high-resolution spectra providing a unique opportunity to extend studies of metal absorbers across cosmic time. I will present the number density evolution of CII, OI and MgII including the first robust measurements of the evolution of weak MgII absorbers at redshifts ranging from 2 to 6. I will examine the origin of these absorbers and discuss what their evolution reveals about the chemical enrichment and the nature of ionising radiation in early Universe that shaped the galaxy evolution.
Local measurement of Λ using pulsar timing arrays
Creators: name: Espriu, Domènec
name: Puigdomènech, Daniel
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We have considered the propagation of gravitational waves (GW) in de Sitter space time and how a non-zero value of the cosmological constant might affect their detection in pulsar timing arrays (PTA). If Λ is different from zero waves are non-linear in Friedmann-Robertson-Walker coordinates and although the amount of non-linearity is very small it gives noticeable effects for GW originating in extragalactic sources such as spiraling black hole binaries. The results indicate that the timing residuals induced by gravitational waves from such sources in PTA would show a peculiar angular dependence with a marked enhancement around a particular value of the angle subtended by the source and the pulsars, depending mainly on the actual value of the cosmological constant and the distance to the source. The position of the peak could represent a gauge of the value of Λ. The enhancement that the new effect brings about could facilitate the first direct detection of gravitational waves while representing a local measurement of Λ.
Swift Publication Statistics And The Comparison With Other Major Observatories
Creators: name: Savaglio, Sandra
name: Grothkopf, Uta
Publisher: name: Zenodo
Year: 2014
Subjects: Publication statistics
Bibliometrics
Telescope bibliographies

description: Swift is a satellite aiming at detecting gamma-ray bursts (GRB), the most energetic stellar explosions. Launched at the end of 2004 and funded until 2016, it is equipped with γ-ray, X-ray, and optical-UV instrumentation and discovers, localizes and collects data for more than hundred GRBs per year.  We studied the bibliometrics produced with Swift data and found that it is one of the most successful medium-size missions ever.  The production in 2005 was 24 papers, and has steadily increased to 328 in the year 2013, surpassing Keck. If this trend continues, Swift may soon be approaching the publication numbers of XMM-Newton and Chandra.  Also the number of citations shows a great success for Swift. The Swift users community publishes mostly in ApJ/S (almost 50% of the papers) as well as A&A and MNRAS (approx. a quarter each). In the years 2005–2013, 47 papers (2.7%) were published in the high-impact journals Nature and Science.
Neuroimaging of valence decisions in children and adults
Creators: name: Sylvester, Teresa
name: Liebig, Johanna
name: Jacobs, Arthur M.
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Affective word processing
subject: Children
subject: Adults
subject: fMRI
subject: Valence decision task
subject: Distributional semantic network
subject: 100 Philosophie und Psychologie::150 Psychologie::150 Psychologie

description: To date, the neural underpinnings of affective components in language processing in children remain largely unknown. To fill this gap, the present study examined behavioural and neural correlates of children and adults performing the same auditory valence decision task with an event-related fMRI paradigm. Based on previous findings in adults, activations in anterior and posterior cingulate cortex, orbitofrontal cortex and left inferior frontal gyrus were expected for both positive and negative valence categories. Recent behavioural findings on valence decisions showed similar ratings and reaction time patterns in children and adults. This finding was successfully replicated in the present study. On a neural level, our analysis of affective language processing showed activations in regions associated with both semantic (superior and middle temporal and frontal) and affective (anterior and posterior cingulate, orbitofrontal and inferior frontal, insula and amygdala) processing. Neural activations in children and adults were systematically different in explicit affective word processing. In particular, adults showed a more distributed semantic network activation while children recruited additional subcortical structures.
Discovery of Semi- and Fully-Synthetic Carbohydrate Vaccines Against Bacterial Infections Using a Medicinal Chemistry Approach
Creators: name: Seeberger, Peter H.
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Immunology
subject: FOS: Clinical medicine
subject: Carbohydrates
subject: Antigens
subject: Vaccination
subject: Chemical biology
subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften

description: The glycocalyx, a thick layer of carbohydrates, surrounds the cell wall of most bacterial and parasitic pathogens. Recognition of these unique glycans by the human immune system results in destruction of the invaders. To elicit a protective immune response, polysaccharides either isolated from the bacterial cell surface or conjugated with a carrier protein, for T-cell help, are administered. Conjugate vaccines based on isolated carbohydrates currently protect millions of people against Streptococcus pneumoniae, Haemophilus influenzae type b, and Neisseria meningitides infections. Active pharmaceutical ingredients (APIs) are increasingly discovered by medicinal chemistry and synthetic in origin, rather than isolated from natural sources. Converting vaccines from biologicals to pharmaceuticals requires a fundamental understanding of how the human immune system recognizes carbohydrates and could now be realized. To illustrate the chemistry-based approach to vaccine discovery, I summarize efforts focusing on synthetic glycan-based medicinal chemistry to understand the mammalian antiglycan immune response and define glycan epitopes for novel synthetic glycoconjugate vaccines against Streptococcus pneumoniae, Clostridium difficile, Klebsiella pneumoniae, and other bacteria. The chemical tools described here help us gain fundamental insights into how the human system recognizes carbohydrates and drive the discovery of carbohydrate vaccines.
Are small-scale poultry farmers aware of aflatoxin contaminants in feed in Oyo State, Nigeria?
Creators: name: Adepoju, Abimbola
name: Obi, Uchenna
name: Jerumeh, Elijah
name: Adepoju, Abimbola
name: Obi, Uchenna
name: Jerumeh, Elijah
Publisher: name: Unknown
Year: 2022
Subjects: subject: Farm Management
subject: Livestock Production/Industries
subject: aflatoxins
subject: poultry feed
subject: agricultural information
subject: awareness
subject: Nigeria

description: Aflatoxins, feed contaminants formed by certain moulds occur naturally as feed and food impurities and have toxic consequences on both animals and humans. Earlier studies on aflatoxins in Nigeria did not consider small-scale poultry farmers’ awareness of feed contamination. Thus, this study examined the level of awareness of aflatoxins in poultry feed and its determinants. Descriptive Statistics and the Logistic Regression Model were the analytical tools employed to analyse data collected from field survey in 2019. One-third of the farmers were aware of aflatoxins in feed which depicts that the level of awareness of aflatoxin in feed by the poultry farmers in the study area is low. Years of education, primary occupation, farm-scale, years of farming experience, access to information from research institutions, and membership in cooperative societies were among the key determinants of the awareness of aflatoxin in feed by the farmers. Efforts should be geared towards increasing the level of awareness of the farmers on the highly toxic contaminant even when fed to poultry at non-fatal levels. Agricultural information highlighting the detrimental consequences of aflatoxin on the health and productivity of poultry and how to minimize aflatoxin contamination in feed should be made more accessible to all farmers.
Distance Majorization and Its Applications
Creators: name: Chi, Eric C.
name: Zhou, Hua
name: Lange, Kenneth
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optimization and Control (math.OC)
subject: Computation (stat.CO)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 65K05, 90C25, 90C30, 62J02

description: The problem of minimizing a continuously differentiable convex function over an intersection of closed convex sets is ubiquitous in applied mathematics. It is particularly interesting when it is easy to project onto each separate set, but nontrivial to project onto their intersection. Algorithms based on Newton's method such as the interior point method are viable for small to medium-scale problems. However, modern applications in statistics, engineering, and machine learning are posing problems with potentially tens of thousands of parameters or more. We revisit this convex programming problem and propose an algorithm that scales well with dimensionality. Our proposal is an instance of a sequential unconstrained minimization technique and revolves around three ideas: the majorization-minimization (MM) principle, the classical penalty method for constrained optimization, and quasi-Newton acceleration of fixed-point algorithms. The performance of our distance majorization algorithms is illustrated in several applications.
description: 29 pages, 6 figures
Testing identification via heteroskedasticity in structural vector autoregressive models
Creators: name: Lütkepohl, Helmut
name: Meitz, Mika
name: Netsunajev, Aleksei
name: Saikkonen, Pentti
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Heteroskedasticity
subject: structural identification
subject: vector autoregressive process
subject: 300 Sozialwissenschaften::330 Wirtschaft::330 Wirtschaft

description: Tests for identification through heteroskedasticity in structural vector autoregressive analysis are developed for models with two volatility states where the time point of volatility change is known. The tests are Wald-type tests for which only the unrestricted model, including the covariance matrices of the two volatility states, has to be estimated. The residuals of the model are assumed to be from the class of elliptical distributions, which includes Gaussian models. The asymptotic null distributions of the test statistics are derived, and simulations are used to explore their small-sample properties. Two empirical examples illustrate the usefulness of the tests in applied work.
Flavor structure of generalized parton distributions from neutrino experiments
Creators: name: Kopeliovich, B. Z.
name: Schmidt, Ivan
name: Siddikov, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The analysis of deeply virtual meson production is extended to neutrino-production of the pseudo-Goldstone mesons (pions, kaons, eta-mesons) on nucleons, with the flavor content of the recoil baryon either remaining intact, or changing to a hyperon from the SU(3) octet. We rely on the SU(3) relations and express all the cross-sections in terms of the proton generalized parton distributions (GPDs). The corresponding amplitudes are calculated at the leading twist level and in the leading order in α_{s}, using a phenomenological parametrization of GPDs. We provide a computational code, which can be used for evaluation of the cross-sections employing various GPD parametrizations. We conclude that these processes can be studied in the experiment Minerva at FERMILAB, which could supplement the measurements at JLAB and help to extract the GPD flavor structure from data.
description: 14 pages, 8 figures. We provide a code which can be used for evaluations with various GPD parametrizations (see "Ancillary files" attached to this arXiv preprint). Version 3: minor changes, matches published version
Cosmic Ink : Fragments From The Past On Journal Pages
Creators: name: Mandrino, Agnese
name: Gargano, Mauro
name: Gasperini, Antonella
Publisher: name: Zenodo
Year: 2014
Subjects: Historical Archives

description: This contribution describes an editorial project created in 2012 o enhance the cultural heritage of the Italian observatories: a regular column “Cieli di inchiostro” (Cosmic ink) devoted to valorize the astronomical historical archives and published in the “Giornale di astronomia”, the journal of Società Astronomica Italiana (Italian astronomical Society).

In every issue of the journal a significant bygone fragment is presented and described. A letter, a diary page, a photograph, a map, a drawing etc... is pulled out from the archival folders to talk about its history. Not only science, instruments, discoveries and observations  but also people, travels, public and private relationships, etc.. all the important scientific and human aspects an historical archives is able to offer.

Furthermore the aim of this project is to raise awareness of activities of reordering, inventoring and valorization of the historical archives belonging to the National Institute for Astrophysics and the Department of Physics and Astronomy of the Bologna University. One more reason for this column is to invite historians, amateurs, students to search and use the documents kept in the archives of the observatories.
Exploiting Social Capital for Improving Personalized Recommendations in Online Social Networks
Creators: name: de Souza, Paulo Roberto
Publisher: name: Zenodo
Year: 2023

description: There are many methods available by social media platforms in order to comprehend user activities for suggesting relevant content. The vast amount of data produced by social media is beyond the capacity of users to process, leading to a widespread problem known as Information Overload. In this case, it becomes essential to filter the information to assist users in dealing with this challenge. It is important to note that social media platforms offer a variety of features such as connections and interactions, which can be leveraged to study user responses to news in their feed. The relevance or influence of news can be defined as Social Capital, a concept employed in this study to characterize user preferences and recommend relevant news. Hence, this paper aims to explore, conceptualize, and incorporate both interactions and existing features on social media platforms by utilizing the concept of Social Capital to create a recommendation system. The offline evaluation of the model demonstrates its effectiveness in recommending personalized and relevant recommendations by accounting for the multifaceted nature of user interactions and preferences. The findings indicate that incorporating social capital into recommender systems can improve the quality of recommendations, contributing to a more engaging and informative user experience on social media platforms.
(Non-)commutative closed string on T-dual toroidal backgrounds
Creators: name: Andriot, David
name: Larfors, Magdalena
name: Lust, Dieter
name: Patalong, Peter
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In this paper we investigate the connection between (non-)geometry and (non-)commutativity of the closed string. To this end, we solve the classical string on three T-dual toroidal backgrounds: a torus with H-flux, a twisted torus and a non-geometric background with Q-flux. In all three situations we work under the assumption of a dilute flux and consider quantities to linear order in the flux density. Furthermore, we perform the first steps of a canonical quantization for the twisted torus, to derive commutators of the string expansion modes. We use them as well as T-duality to determine, in the non-geometric background, a commutator of two string coordinates, which turns out to be non-vanishing. We relate this non-commutativity to the closed string boundary conditions, and the non-geometric Q-flux.
description: 47 pages; published version
Vacuum structure and stability of a singlet fermion dark matter model with a singlet scalar messenger
Creators: name: Baek, Seungwon
name: Ko, P.
name: Park, Wan-Il
name: Senaha, Eibun
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider the issue of vacuum stability and triviality bound of the singlet extension of the Standard Model (SM) with a singlet fermion dark matter (DM). In this model, the singlet scalar plays the role of a messenger between the SM sector and the dark matter sector. This model has two Higgs-like scalar bosons, and is consistent with all the data on electroweak precision tests, thermal relic density of DM and its direct detection constraints. We show that this model is stable without hitting Landau pole up to Planck scale for 125 GeV Higgs boson. We also perform a comprehensive study of vacuum structure, and point out that a region where electroweak vacuum is the global minimum is highly limited. In this model, both Higgs-like scalar bosons have reduced couplings to the SM weak gauge bosons and the SM fermions, because of the mixing between the SM Higgs boson and the singlet scalar. There is also a possibility of their invisible decay(s) into a pair of DM's. Therefore this model would be disfavored if the future data on the $(σ\cdot B)_{VV}$ or $(σ\cdot B)_{f\bar{f}}$ with $V=γ,W,Z$ and $f=b, τ$ turn out larger than the SM predictions.
description: 41 pages, 31 figures; v2: references added; v3: new figure added, version to appear in JHEP
Ground state in a half-doped manganite distinguished by neutron spectroscopy
Creators: name: Johnstone, G. E.
name: Perring, T. G.
name: Sikora, O.
name: Prabhakaran, D.
name: Boothroyd, A. T.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We have measured the spin-wave spectrum of the half-doped bilayer manganite Pr(Ca,Sr)2Mn2O7 in its spin, charge, and orbital ordered phase. The measurements, which extend throughout the Brillouin zone and cover the entire one-magnon spectrum, are compared critically with spin-wave calculations for different models of the electronic ground state. The data are described very well by the Goodenough model, which has weakly interacting ferromagnetic zig-zag chains in the CE-type arrangement. A model that allows ferromagnetic dimers to form within the zigzags is inconsistent with the data. The analysis conclusively rules out the strongly bound dimer (Zener polaron) model.
description: Published in Physical Review Letters. Supplementary material is available from the corresponding authors
FragMAXapp: crystallographic fragment-screening data-analysis and project-management system
Creators: name: Lima, Gustavo M. A.
name: Jagudin, Elmir
name: Talibov, Vladimir O.
name: Benz, Laila S.
name: Marullo, Costantino
name: Barthel, Tatjana
name: Wollenhaupt, Jan
name: Weiss, Manfred S.
name: Mueller, Uwe
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: fragment screening
subject: high-throughput data analysis
subject: protein crystallography
subject: drug discovery
subject: fragment-based lead discovery
subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften

description: Crystallographic fragment screening (CFS) has become one of the major techniques for screening compounds in the early stages of drug-discovery projects. Following the advances in automation and throughput at modern macromolecular crystallography beamlines, the bottleneck for CFS has shifted from collecting data to organizing and handling the analysis of such projects. The complexity that emerges from the use of multiple methods for processing and refinement and to search for ligands requires an equally sophisticated solution to summarize the output, allowing researchers to focus on the scientific questions instead of on software technicalities. FragMAXapp is the fragment-screening project-management tool designed to handle CFS projects at MAX IV Laboratory. It benefits from the powerful computing infrastructure of large-scale facilities and, as a web application, it is accessible from everywhere.
Tidal evolution of close-in giant planets : Evidence of Type II migration?
Creators: name: Rice, W. K. M.
name: Veljanoski, J.
name: Cameron, A. Collier
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: It is well accepted that 'hot Jupiters' did not form in situ, as the temperature in the protoplanetary disc at the radius at which they now orbit would have been too high for planet formation to have occurred. These planets, instead, form at larger radii and then move into the region in which they now orbit. The exact process that leads to the formation of these close-in planets is, however, unclear and it seems that there may be more than one mechanism that can produce these short-period systems. Dynamical interactions in multiple-planet systems can scatter planets into highly eccentric orbits which, if the pericentre is sufficiently close to the parent star, can be tidally circularised by tidal interactions between the planet and star. Furthermore, systems with distant planetary or stellar companions can undergo Kozai cycles which can result in a planet orbiting very close to its parent star. However, the most developed model for the origin of short period planets is one in which the planet exchanges angular momentum with the surrounding protoplanetary disc and spirals in towards the central star. In the case of 'hot Jupiters', the planet is expected to open a gap in the disc and migrate through Type II .migration. If this is the dominant mechanism for producing `hot Jupiters' then we would expect the currect properties of observed close-in giant planets to be consistent with an initial population resulting from Type II migration followed by evolution due to tidal interactions with the central star. We consider initial distributions that are consistent with Type II migration and find that after tidal evolution, the final distributions can be consistent with that observed. Our results suggest that a modest initial pile-up at a ~ 0.05 au is required and that the initial eccentricity distribution must peak at e \sim 0.
description: 10 pages, 15 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society
Alternative Animal Models of Aging Research
Creators: name: Holtze, Susanne
name: Gorshkova, Ekaterina
name: Braude, Stan
name: Cellerino, Alessandro
name: Dammann, Philip
name: Hildebrandt, Thomas B.
name: Hoeflich, Andreas
name: Hoffmann, Steve
name: Koch, Philipp
name: Terzibasi Tozzini, Eva
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Senescence
subject: Heterocephalus glaber
subject: Myotis
subject: Nothobranchius furzeri
subject: Proteus anguinus
subject: Hydra oligactis
subject: Greenland shark
subject: resistance to cancer
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: Most research on mechanisms of aging is being conducted in a very limited number of classical model species, i.e., laboratory mouse (Mus musculus), rat (Rattus norvegicus domestica), the common fruit fly (Drosophila melanogaster) and roundworm (Caenorhabditis elegans). The obvious advantages of using these models are access to resources such as strains with known genetic properties, high-quality genomic and transcriptomic sequencing data, versatile experimental manipulation capabilities including well-established genome editing tools, as well as extensive experience in husbandry. However, this approach may introduce interpretation biases due to the specific characteristics of the investigated species, which may lead to inappropriate, or even false, generalization. For example, it is still unclear to what extent knowledge of aging mechanisms gained in short-lived model organisms is transferable to long-lived species such as humans. In addition, other specific adaptations favoring a long and healthy life from the immense evolutionary toolbox may be entirely missed. In this review, we summarize the specific characteristics of emerging animal models that have attracted the attention of gerontologists, we provide an overview of the available data and resources related to these models, and we summarize important insights gained from them in recent years. The models presented include short-lived ones such as killifish (Nothobranchius furzeri), long-lived ones such as primates (Callithrix jacchus, Cebus imitator, Macaca mulatta), bathyergid mole-rats (Heterocephalus glaber, Fukomys spp.), bats (Myotis spp.), birds, olms (Proteus anguinus), turtles, greenland sharks, bivalves (Arctica islandica), and potentially non-aging ones such as Hydra and Planaria.
Preference for a Vanishingly Small Cosmological Constant in Supersymmetric Vacua in a Type IIB String Theory Model
Creators: name: Sumitomo, Yoske
name: Tye, S. -H. Henry
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the probability distribution P(Λ) of the cosmological constant Λin a specific set of KKLT type models of supersymmetric IIB vacua. We show that, as we sweep through the quantized flux values in this flux compactification, P(Λ) behaves divergent at Λ=0^- and the median magnitude of Λdrops exponentially as the number of complex structure moduli h^{2,1} increases. Also, owing to the hierarchical and approximate no-scale structure, the probability of having a positive Hessian (mass squared matrix) approaches unity as h^{2,1} increases.
description: 6 pages, 2 figures; v2: version to appear in PLB
Majority Colorings of Sparse Digraphs
Creators: name: Anastos, Michael
name: Lamaison, Ander
name: Steiner, Raphael
name: Szabó, Tibor
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: majority coloring
subject: directed graph
subject: vertex-coloring
subject: 500 Naturwissenschaften und Mathematik::510 Mathematik::510 Mathematik

description: A majority coloring of a directed graph is a vertex-coloring in which every vertex has the same color as at most half of its out-neighbors. Kreutzer, Oum, Seymour, van der Zypen and Wood proved that every digraph has a majority 4-coloring and conjectured that every digraph admits a majority 3-coloring. They observed that the Local Lemma implies the conjecture for digraphs of large enough minimum out-degree if, crucially, the maximum in-degree is bounded by a(n exponential) function of the minimum out-degree. Our goal in this paper is to develop alternative methods that allow the verification of the conjecture for natural, broad digraph classes, without any restriction on the in-degrees. Among others, we prove the conjecture 1) for digraphs with chromatic number at most 6 or dichromatic number at most 3, and thus for all planar digraphs; and 2) for digraphs with maximum out-degree at most 4. The benchmark case of r-regular digraphs remains open for r∈[5,143] Our inductive proofs depend on loaded inductive statements about precoloring extensions of list-colorings. This approach also gives rise to stronger conclusions, involving the choosability version of majority coloring. We also give further evidence towards the existence of majority-3-colorings by showing that every digraph has a fractional majority 3.9602-coloring. Moreover we show that every digraph with large enough minimum out-degree has a fractional majority (2+ε)-coloring.
Origin of pressure induced second superconducting dome in AyFe2-xSe2 [A=K, (Tl,Rb)]
Creators: name: Das, Tanmoy
name: Balatsky, A. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recent observation of pressure induced second superconducting phase in AyFe2-xSe2 [A=K, (Tl,Rb)] calls for the models of superconductivity that are rich enough to allow for multiple superconducting phases. We propose the model where pressure induced changes in Fermi surface topology lead to appearance of the hole pocket at $Γ$ point at high pressure. We develop low-energy effective model, derived from first-principles band-structure calculation, to suggest the phase assignment where low pressure superconducting state with no hole pocket at $Γ$ point is a nodeless d-wave state. It evolves into a s+- state at higher pressure when the Fermi surface topology changes and hole pocket appears. We analyze the pairing interactions using five band tight binding fitted band structure and find strong pairing strength dependents on pressure. We also evaluate the energy and momentum dependence of neutron spin resonances in each of the phases as verifiable predictions of our proposal.
description: 13 pages (single column), 5 figures, (v2): DFT calculation included. (v3): published version