cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Primordial Weibel instability
Creators: name: Mirón-Granese, Nahuel
name: Calzetta, Esteban
name: Kandus, Alejandra
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the onset of vector instabilities in the post-inflationary epoch of the Universe as a mechanism for primordial magnetic fields amplification. We assume the presence of a charged spectator scalar field arbitrarily coupled to gravity during Inflation in its vacuum de Sitter state. Gravitational particle creation takes place at the transition from Inflation to the subsequent Reheating stage and thus the vacuum field state becomes an excited many particles one. Consequently this state can be described as a real fluid, and we build out the hydrodynamic framework using second order theories for relativistic fluids with a relaxation time prescription for the collision integral. Given the high-temperature regime and the vanishing scalar curvature of the Universe during Reheating (radiation-dominated-type era), the fluid can be regarded as a conformal one. The large quantum fluctuations induced by the rapid transition from inflationary to effectively radiation dominated expansion become statistical fluctuations whereby both a charge excess and anisotropic pressures are produced in any finite domain. The precise magnitude of the effect for each scale is determined by the size of the averaging domain and the coupling to curvature. We look at domains which are larger than the horizon at the beginning of Reheating, but much smaller than our own horizon, and show that in a finite fraction of them the anisotropy and charge excess provide suitable conditions for a Weibel instability. If moreover the duration of reheating is shorter than the relaxation time of the fluid, then this instability can compensate or even overcome the conformal dilution of a primordial magnetic field. We show that the non-trivial topology of the magnetic field encoded in its magnetic helicity is also amplified if present.
description: 34 pages, 7 figures. Minor changes with respect to the original version. A calculation of the coherence length of helical fields included. Discussions on some approximations were enlarged. Typos and a conceptual mistake in the Introduction corrected
Robust Half-Metallic Character and Large Oxygen Magnetism in a Perovskite Cuprate
Creators: name: Wan, Xiangang
name: Kohno, Masanori
name: Hu, Xiao
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The new perovskite cuprate material Sr$_{8}$CaRe$_{3}$Cu$_{4}$O$_{24}$, which behaves ferrimagnetically and shows an unusually high Curie temperature ($T_c \sim$ 440 K), is found from density-functional theory calculation to display several surprising properties after hole doping or chemical substitution: (1) Half metal (HM) is realized by replacing Re with W or Mo while $T_c$ remains high; (2) hole-doped Sr$_{8}$CaRe$_{3}$Cu$_{4}$O$_{24}$ is also HM with high $T_c$. Moreover, we find that the O atoms will carry a large magnetic moment after hole doping, which is in sharp contrast with the generally accepted concept that magnetism in solid requires partially filled shells of $d$ or $f$ electrons in cations. The material Sr$_8$CaRe$_3$Cu$_4$O$_{24}$ is therefore expected to provide a very useful platform for material design and development.
description: 5 pages and 4 figures
Patent Races with Dynamic Complementarity
Creators: name: Blasco, Andrea
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-P/01 Economia politica

description: Recent models of multi-stage R&D have shown that a system of weak intellectual property rights may lead to faster innovation by inducing firms to share intermediate technological knowledge. In this article I introduce a distinction between plain and sophisticated technological knowledge, which has not been noticed so far but plays a crucial role in determining how different appropriability rules affect the incentives to innovate. I argue that the positive effect of weak intellectual property regimes on the sharing of intermediate technological knowledge vanishes when technological knowledge is sophisticated, as is likely to be the case in many high tech industries.
GRB 080710: A narrow, structured jet showing a late, achromatic peak in the optical and infrared afterglow?
Creators: name: Obayashi, Kaori
name: Toriyama, Ayumu
name: Murakoshi, Mayu
name: Sato, Yuri
name: Tanaka, Shuta J.
name: Sakamoto, Takanori
name: Yamazaki, Ryo
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a possible theoretical interpretation of the observed afterglow emission of long gamma-ray burst GRB 080710. While its prompt GRB emission properties are normal, the afterglow light curves in the optical and infrared bands are exceptional in two respects. One is that the observed light curves of different wavelengths have maximum at the same time, and that the achromatic peak time, $2.2\times10^3$ s after the burst trigger, is about an order of magnitude later than typical events. The other is that the observed flux before the peak increases more slowly than theoretically expected so far. Assuming that the angular distribution of the outflow energy is top-hat or Gaussian-shaped, we calculate the observed light curves of the synchrotron emission from the relativistic jets and explore the model parameters that explain the observed data. It is found that a narrowly collimated Gaussian-shaped jet with large isotropic-equivalent energy is the most plausible model for reproducing the observed afterglow behavior. Namely, an off-axis afterglow scenario to the achromatic peak is unlikely. The inferred values of the opening angle and the isotropic equivalent energy of the jet are possibly similar to those of GRB 221009A, but the jet of GRB 080710 has a much smaller efficiency of the prompt gamma-ray emission. Our results indicate a greater diversity of the GRB jet properties than previously thought.
description: 20 pages, 6 figures, 4 tables
The Relationship Between Financial Risk Premia and Macroeconomic Volatility: Issues and Perspectives on the Run-Up to the Turmoil
Creators: name: Marzo, Massimiliano
name: Liu, Zhoushi
name: Zagaglia, Paolo
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-P/01 Economia politica

description: This note sketches the issues that arise while interpreting the relation between macroeconomic volatility and financial risk premia from the perspective of the standard consumption-based asset pricing model. The relation arises from the fact that all assets are priced by the same ‘pricing kernel’, given by the inter-temporal marginal rate of substitution in consumption of the representative investor. 

Since the pricing kernel is a function of aggregate consumption, financial risk premia are positively related to consumption growth volatility. Therefore, from the perspective of this workhorse often employed in the academic debate, the persistent reduction in macroeconomic volatility can be considered a cause for the low average risk premia prevailing during the so-called Great Moderation, namely the period preceding the recent turmoil in financial markets. We challenge this view by shedding light on the issues that generate an inconsistent interpretation of the model outcomes. In particular, since the consumption-based model is geared towards asset prices consistent with macroeconomic fundamentals, we argue that it is not suited for interpreting current developments where underestimation of risk may have subsidized asset prices. In particular, according to the evidence for the Great Moderation, the model view suffers from observational equivalence.
[Elicitation of verb paradigms and sentences, story of confirmation]
Creators: name: Cortés Vásquez, Rafael
name: García Cortés, María Agustina
name: McFarland, Teresa
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2020
Subjects: subject: tlp

description: 3 WAV files. Corresponds to pp. 59-69 of related field notes. Story is file 003, with transcription and translation on pp. 68-69.
First record of the migrant dragonfly Pantala flavescens for mainland Italy (Insecta: Odonata)
Creators: name: Piretta, Lorenza
name: Assandri, Giacomo
Publisher: name: Fragmenta Entomologica
Year: 2019

description: In this contribution we report the observation of an individual of the migrant dragonfly Pantala flavescens (Fabricius, 1798) found at Montanaro (Piemonte, Italy) on 14 Aug 2019. This represents the first record of the species for mainland Italy and one of the very few available for Western and Central Europe before 2019. We discuss two hypotheses on the origin of this individual integrating available literature with very recent records retrieved from citizen science faunistic platforms.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
Two-step phase changes in cubic relaxor ferroelectrics
Creators: name: Colla, Eugene V.
name: Weissman, M. B.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The field-driven conversion between the zero-field-cooled frozen relaxor state and a ferroelectric state of several cubic relaxors is found to occur in at least two distinct steps, after a period of creep, as a function of time. The relaxation of this state back to a relaxor state under warming in zero field also occurs via two or more sharp steps, in contrast to a one-step relaxation of the ferroelectric state formed by field-cooling. An intermediate state can be trapped by interrupting the polarization. Giant pyroelectric noise appears in some of the non-equilibrium regimes. It is suggested that two coupled types of order, one ferroelectric and the other glassy, may be required to account for these data.
description: 27 pages with 8 figures to appear in Phys. Rev. B
The likely alien species Pseudacrobasis tergestella (Ragonot, 1901) in central Italy (Lepidoptera: Pyralidae)
Creators: name: Pinzari, Manuela
name: Pinzari, Mario
name: Bencivenga, Gianluca
name: Zerunian, Zerun
Publisher: name: Fragmenta Entomologica
Year: 2019

description: In this paper, we refer to the finding of Pseudacrobasis tergestella in central Italy. This species was found in Europe and described for the first time from NE Italy; subsequently it was found in Eastern Asia and described again as P. nankingella. In Italy, only two specimens from the North and four specimens from the South were known. Now the species was also recorded in central Italy providing evidence of the continuity of its distribution in our country.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
Classification of Periodic Variable Stars with Novel Cyclic-Permutation Invariant Neural Networks
Creators: name: Zhang, Keming
name: Bloom, Joshua S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Machine Learning (cs.LG)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Neural networks (NNs) have been shown to be competitive against state-of-the-art feature engineering and random forest (RF) classification of periodic variable stars. Although previous work utilising NNs has made use of periodicity by period folding multiple-cycle time-series into a single cycle -- from time-space to phase-space -- no approach to date has taken advantage of the fact that network predictions should be invariant to the initial phase of the period-folded sequence. Initial phase is exogenous to the physical origin of the variability and should thus be factored out. Here, we present cyclic-permutation invariant networks, a novel class of NNs for which invariance to phase shifts is guaranteed through polar coordinate convolutions, which we implement by means of "Symmetry Padding." Across three different datasets of variable star light curves, we show that two implementations of the cyclic-permutation invariant network: the iTCN and the iResNet, consistently outperform non-invariant baselines and reduce overall error rates by between 4% to 22%. Over a 10-class OGLE-III sample, the iTCN/iResNet achieves an average per-class accuracy of 93.4%/93.3%, compared to RNN/RF accuracies of 70.5%/89.5% in a recent study using the same data. Finding improvement on a non-astronomy benchmark, we suggest that the methodology introduced here should also be applicable to a wide range of science domains where periodic data abounds due to physical symmetries.
description: Accepted to MNRAS. Extended abstract accepted to NeurIPS 2020: Machine Learning for the Physical Sciences. Initially appeared in ICLR 2020: Fundamental Science in the Era of AI. Open source implementation at https://github.com/kmzzhang/periodicnetwork. 8 pages, 4 figures
Anisotropic Molecular Photoemission Dynamics Part. I Wigner meets the RABBIT
Creators: name: M., Berkane
name: A., Desrier
name: C., Lévêque
name: R., Taïeb
name: J, Caillat
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We investigate signatures of anisotropy on the dynamics of time-resolved near-threshold molecular photoemission, through simulations on a one-dimension asymmetric model molecule. More precisely, we study the relationship between the fundamental Wigner delays that fully characterizes the dynamics of one-photon ionization, and the delays inferred from two-color interferometric rabbit measurements. Our results highlights two different properties pertaining to each of these delays. The first one is related to the inherent necessity to fix an arbitrary electron position origin to define and compute de Wigner-delay. The second one is the dependency of the rabbit delay on the frequency of the probe laser. Our results show that the angular variations of both delays converge for a specific choice of the position origin and in the limit of a vanishing probe frequency.
description: 13 pages, 9 figures
The Role of Productivity Growth and Farmers' Income Protection Policies in the Decline of Relative Farm Prices in the United States
Creators: name: Miljkovic, Dragan
name: Jin, Hyun Joung
name: Paul, Rodney
name: Miljkovic, Dragan
name: Jin, Hyun Joung
name: Paul, Rodney
Publisher: name: Unknown
Year: 2007
Subjects: subject: Agricultural and Food Policy
subject: Agricultural Finance
subject: Productivity Analysis
subject: Government transfers
subject: Productivity growth
subject: Relative farm prices

description: The paper emphasizes three interrelated questions about the decline in relative farm to non-farm prices in the United States since 1973; 1) Is it unusual, 2) What caused it, and 3) Is it likely to continue? We find that based on historical and international evidence this phenomenon may be considered unusual. Separating farm price and income support in 1973 and growing relative productivity in agriculture has been the major contributor to changing the trend of the relative farm goods inflation. This trend is likely to continue based on predicted steady growth of relative agricultural productivity and continuation of direct payments and other forms of farm income support policies.
Majorization: Here, There and Everywhere
Creators: name: Arnold, Barry C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: The appearance of Marshall and Olkin's 1979 book on inequalities with special emphasis on majorization generated a surge of interest in potential applications of majorization and Schur convexity in a broad spectrum of fields. After 25 years this continues to be the case. The present article presents a sampling of the diverse areas in which majorization has been found to be useful in the past 25 years.
description: Published in at http://dx.doi.org/10.1214/0883423060000000097 the Statistical Science (http://www.imstat.org/sts/) by the Institute of Mathematical Statistics (http://www.imstat.org)
CIMMYT 1997/98 WORLD MAIZE FACTS AND TRENDS; MAIZE PRODUCTION IN DROUGHT-STRESSED ENVIRONMENTS: TECHNICAL OPTIONS AND RESEARCH RESOURCE ALLOCATION
Creators: name: Heisey, Paul W.
name: Edmeades, Gregory O.
name: Heisey, Paul W.
name: Edmeades, Gregory O.
Publisher: name: Unknown
Year: 1999
Subjects: Crop Production/Industries

description: This publication, through its focus on maize production in drought stressed areas of developing countries, explores economic, research, and policy issues related to maize agriculture in marginal areas of the developing world generally. Key questions in the debate over agriculture in marginal vs. favorable production areas are reviewed with a focus on maize. Questions include whether maize production is expanding into marginal areas, if production from such areas is necessary to meet future demand, and what is the relationship between marginal production environments and poverty. Different research resource allocations (leading to technological change) are modeled to compare gains and losses to producers and consumers in marginal, favorable, and urban areas of a country. A thorough overview of technical constraints and responses for maize production in drought-stressed environments is also presented. The authors conclude that agricultural research for marginal and, particularly, for drought-stressed areas will continue to be justified on the basis of meeting future demand requirements. Evidence that the marginality of agricultural land is related to poverty is decidedly mixed because of a range of factors outside the realm of agroclimatic conditions. To better determine efficient research allocations, considerably more study in this neglected area will be required. Such research should incorporate data from case studies, and more accurate definition of marginal areas provided by data from geographic information systems, crop modeling, and refined economic measures. The publication concludes with a brief overview of the world maize situation in 1997/98, followed by selected statistics on production, consumption, and trade for all regions of the world.
SOCIAL FOOD; More than meets the eye.pdf
Creators: name: Kyomugisha, Pamella
Publisher: name: figshare
Year: 2021
Subjects: subject: Uncategorized
subject: 140201 Agricultural Economics
subject: FOS: Economics and business

description: Among the four most basic fundamental human needs is food. Crucial for survival as it is, the despairing reality is that approximately 65 million Africans are acutely food insecure. (" World Vision", 2020) Africa has 60% of the world’s uncultivated arable land. As its population has doubled overall and tripled in urban areas in the past 30 years, agricultural production and food security have struggled to keep pace. Africa is the only continent where the absolute number of undernourished people has increased over the past 30 years. (Plaizier, 2016) Food insecurity is no surprise given that sub-Saharan Africa accounts for roughly 60% of the global population living in poverty but let’s leave the numbers for now. “A hungry mind is an angry mind” so goes the English saying. What an angry mind can do is a flight of reality I will not delve into. We all have been angry at a certain point in time. Poverty and other instabilities in attaining basic needs are usually looked at from the physical perspective and how it affects the body. The novel challenges that the media has spread out regarding food insecurity are hunger, malnourishment, and poverty but what if I said there is more to that than meets the eye?
Araneae.it: the online Catalog of Italian spiders, with addenda on other Arachnid Orders occurring in Italy (Arachnida: Araneae, Opiliones, Palpigradi, Pseudoscorpionida, Scorpiones, Solifugae)
Creators: name: Pantini, Paolo
name: Isaia, Marco
Publisher: name: Fragmenta Entomologica
Year: 2019

description: In this contribution we present the Catalog of Italian spiders, produced on the base of the available scientific information regarding spider species distribution in Italy. We analysed an amount of 1124 references, resulting in a list of 1670 species and subspecies, grouped in 434 genera and 53 families. Information on spider biodiversity in Italy has increased rapidly in the last years, going from 404 species at the end of XIX century, to 1400 in the 1990s, to the current 1670. However, the knowledge on the distribution of the Italian species is far from being complete and it seems likely that there are still new species to be found or described. The Italian spider fauna is characterized by the presence of a relevant number of endemic species (342). Concerning families, Linyphiidae show the highest number of species (477) and the highest number of endemics (114). Gnaphosidae (166) and Salticidae (144) follows in terms of species richness, while Dysderidae (72) and Agelenidae (38) follows as total number of endemics. Information regarding the regional distribution revealed great unbalance between Northern and Southern Italy, with very scarce records for some regions in the South. This work is accompanied by an online version freely available online at www.araneae.it, where all information is thoroughly detailed and regularly updated by the authors. Besides spiders, we also provide, the species lists of other Arachnid orders occurring in Italy (Opiliones, Palpigradi, Pseudoscorpionida, Scorpiones, Solifugae). The lists and the associated details are available in a dedicated section of the online version of the Catalog.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
Minimum Quality Standards in Hedonic Markets with Environmental Externalities
Creators: name: Ecchia, Giulio
name: Lambertini, Luca
name: Tampieri, Alessandro
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-P/01 Economia politica

description: We investigate the introduction of a minimum quality standard (MQS) in a vertically differentiated duopoly with an environmental externality. We establish that the MQS bites only if the hedonic component of consumer preferences is sufficiently strong. Then, we illustrate an underlying tradeoff between the beneficial effects of quality enhancement on prices and the associated undesirable increase in the environmental externality.
Anthrenus (Anthrenops) coloratus Reitter, 1881: a new pest in Italian entomological collections (Coleoptera: Dermestidae)
Creators: name: Nardi, Gianluca
name: Háva, Jiří
Publisher: name: Fragmenta Entomologica
Year: 2019

description: The first infestation of a museum entomological collection in Italy by Anthrenus (Anthrenops) coloratus Reitter, 1881 is recorded; it was detected in Rome (Lazio Region) in 2014. General distribution and biological data on this pest are summarized.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
Vertical Differentiation in a Cournot Industry: The Porter Hypothesis and Beyond
Creators: name: Lambertini, Luca
name: Tampieri, Alessandro
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-P/01 Economia politica

description: We modify the vertically differentiated duopoly model by André et al. (2009) replacing Bertrand with Cournot behaviour to show that firms may spontaneously adopt a green technology even in the complete absence of any form of regulation.
Economic Aspects of Agricultural and Food Biosecurity in the United States
Creators: name: Hennessy, David A.
name: Hennessy, David A.
Publisher: name: Unknown
Year: 2007
Subjects: subject: Food Consumption/Nutrition/Food Safety
subject: agro-terrorism
subject: animal disease
subject: biosecurity
subject: epidemic
subject: food system policy

description: Concerns about biosecurity in the food system raise a variety of issues about how the system is presently organized, why it might be vulnerable, what one could reasonably do to better secure it, and the costs of doing so. After presenting some facts about US agriculture and food, this paper considers three economic aspects of the general problem. One is the global problem, or the way biosecurity measures can affect how countries relate to each other and the global consequences that result. Another is how to best manage the immediate aftermath of a realized threat in order to minimize damage. The third is how to seek to prevent realization of the threat. Some policy alternatives are also presented.
The sacralization of politics and the politization of the sacred during the Spanish Civil War and the first francoism (1936-1943)
La sacralizzazione politica e la politicizzazione del sacro durante la guerra civile spagnola e il primo franchismo (1936-1943)
Creators: name: Baisotti, Pablo Alberto <1977>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: M-STO/04 Storia contemporanea

description: Tra il 1936 e il 1943 la Spagna visse un periodo di guerra civile e scontri fra la Falange e la Chiesa. Tutto ciò non fece altro che innalzare la figura di Franco, un generale, che viene sacralizzato e che governò per quasi 40 anni
description: The sacralization of politics and politization of the sacred occurred between 1936 to 1943 thanks to the war and the religious persecution. Franco gained power and became a god-like dictator.
Watching Corn Grow: A Hedonic Study of the Iowa Landscape
Creators: name: Secchi, Silvia
name: Secchi, Silvia
Publisher: name: Unknown
Year: 2007
Subjects: subject: Crop Production/Industries
subject: Environmental Economics and Policy
subject: environmental management
subject: hedonic analysis
subject: land use
subject: spatial externalities

description: Landscape amenities can be scarce in places with large areas of open space. Intensely farmed areas with high levels of monocropping and livestock production are akin to developed open space areas and do not provide many services in terms of landscape amenities. Open space in the form of farmland is plentiful, but parks and their services are in short supply. This issue is of particular importance for public policy because it is closely linked to the impact of externalities caused by agricultural activities and to the indirect effects of land use dynamics. This study looks at the impact of landscape amenities on rural residential property values in five counties in North Central Iowa using a hedonic pricing model based on geographic information systems. The effect of cropland, pasture, forest, and developed land as land uses surrounding the property is considered, as well as the impact of proximity to recreational areas. The study also includes the effect of other disamenities, such as livestock facilities and quarries, which can be considered part of the developed open space and are a common feature of the Iowa landscape.
A Mole Cricket Neoscapteriscus didactylus from Guadeloupe with advice to wear and tear of dactyls (Orthoptera: Gryllotalpidae)
Creators: name: Jentzsch, Matthias
Publisher: name: Fragmenta Entomologica
Year: 2019

description: A mole cricket Neoscapteriscus didactylus (Latreille, 1804) was found in 2019 in Saint Rose, Guadeloupe (West Indies). This is the first secured record for this French overseas department. Wear of some dactyls of the insect’s foretibiae is presented.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
Nuclear isomers: structures and applications
Creators: name: Sun, Yang
name: Wiescher, Michael
name: Aprahamian, Ani
name: Fisker, Jacob L.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Isomeric states in the nuclei along the rapid proton capture process path are studied by the projected shell model. Emphasis is given to two waiting point nuclei Se-68 and Kr-72 that are characterized by shape coexistence. Energy surface calculations indicate that the ground state of these nuclei corresponds to an oblate-deformed minimum, while the lowest state at the prolate-deformed minimum can be considered as a shape isomer. Due to occupation of the orbitals with large K-components, states built upon two-quasiparticle excitations at the oblate-deformed minimum may form high $K$-isomers. The impact of the isomer states on isotopic abundance in X-ray bursts is studied in a multi-mass-zone X-ray burst model by assuming an upper-lower limit approach.
description: 5 pages, 4 figures, from the CGS-12 Conference on Capture Gamma-Ray Spectroscopy and Related Topics, submitted to AIP proceedings
Topological and geometrical aspects of band theory
Creators: name: Cayssol, J.
name: Fuchs, J. -N.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: This paper provides a pedagogical introduction to recent developments in geometrical and topological band theory following the discovery of graphene and topological insulators. Amusingly, many of these developments have a connection to contributions in high-energy physics by Dirac. The review starts by a presentation of the Dirac magnetic monopole, goes on with the Berry phase in a two-level system and the geometrical/topological band theory for Bloch electrons in crystals. Next, specific examples of tight-binding models giving rise to lattice versions of the Dirac equation in various space dimension are presented: in 1D (Su-Schrieffer-Heeger and Rice-Mele models), 2D (graphene, boron nitride, Haldane model) and 3D (Weyl semi-metals). The focus is on topological insulators and topological semi-metals. The latter have a Fermi surface that is characterized as a topological defect. For topological insulators, the two alternative view points of twisted fiber bundles and of topological textures are developed. The minimal mathematical background in topology (essentially on homotopy groups and fiber bundles) is provided when needed. Topics rarely reviewed include: periodic versus canonical Bloch Hamiltonian (basis I/II issue), Zak versus Berry phase, the vanishing electric polarization of the Su-Schrieffer-Heeger model and Dirac insulators.
description: review, 69 pages, 23 figures, 2 tables, final version
'Awareness' in metamorphosing pupae (Lepidoptera: Pieridae)
Creators: name: Hawes, Timothy C.
Publisher: name: Fragmenta Entomologica
Year: 2019

description: Neurobiological studies of model insect species have established that the nervous system retains some larval innervations, remodels others, and develops other new adult innervations during metamorphosis. Using a simple behavioral response – the ability to ‘kick’ by pupae of the pierid, Catopsilia pomona (Fabricius, 1775) - it was possible to assay for the retention of environmental awareness during ontogenetic reorganization. All pupae kicked 24h after ecdysis, 48% of pupae kicked at the pharate adult stage, and 28% of pupae kicked every day of their development (6.52 d ± 0.10). Both the mode and temporal expression of the response indicate that this retained awareness has larval origins. Variability in the response supports the inference that this response is mediated, to some extent, by prior experience rather than purely ‘reflex’. This is consistent with a Darwinian explanation of the behavior (and retained environmental awareness itself) as serving a protective function in pupae.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
Conductance of Finite-Scale Systems with Multiple Percolation Channels
Creators: name: Meilikhov, E. Z.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate properties of two-dimensional finite-scale percolation systems whose size along the current flow is smaller than the perpendicular size. Successive thresholds of appearing multiple percolation channels in such systems have been determined and dependencies of the conductance on their size and percolation parameter $p$ have been calculated. Various experimental examples show that the finite-scale percolation system is the natural mathematical model suitable for the qualitative and quantitative description of different physical systems.
description: 11 pages, 7 figures
Grußwort zum 65. Geburtstag von D. Dr. Hanfried Krüger
Creators: name: Held, Heinz Joachim
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 28 Nr. 2 (1979): Ökumenische Rundschau, Band 28, Heft 2
Sinistra extraparlamentare e Partito comunista in italia 1968-1976
Radical Left-Wing Groups and Italian Communist Party in Italy 1968-1976
Creators: name: Casini, Valentina <1981>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: M-STO/04 Storia contemporanea

description: La ricerca affronta il rapporto tra il Partito comunista italiano e le organizzazioni della sinistra extraparlamentare nate nel biennio 1968-1969. Sulla base di documentazione d’archivio e fonti a stampa, vengono ricostruite ed analizzate le relazioni tra questi due soggetti nel periodo compreso tra la fine degli anni Sessanta e la metà del decennio successivo, quando i principali gruppi politici della sinistra extraparlamentare si dotarono di una struttura organizzativa più stabile che segnava una discontinuità con l’esperienza precedente. Nel corso della prima metà degli anni Settanta, i rapporti tra il PCI e queste organizzazioni furono complessi e talvolta contraddittori. Il conflitto si consumò prevalentemente sulla reciproca pretesa di possedere l’esclusiva rappresentanza politica del fermento sociale che attraversava il paese in quegli anni: il PCI rappresentando se stesso come l’unica forza politica capace di mediare tra movimenti sociali e istituzioni; i gruppi della sinistra parlamentare come «avanguardie» di un irrealizzabile progetto «rivoluzionario».
description: The aim of the research is to reconstruct and interpret the relationship between the Italian Communist Party and the Radical Left-Wing Groups in Italy from 1969 to 1976. Based on researches in the archives of the Italian Communist Party, Ministry of Interior and small archives that conserve unpublished documents of the groups, the paper will focus on the constant attention and monitoring that the Italian Communist Party addressed to the extreme left groups and on how those political organizations have been changed their approach and strategy toward the PCI during this period. During the first half of the Seventies, the relationship between the PCI and these organizations were complex and sometimes contradictory. The conflict was consumed mainly on the mutual claim to possess the exclusive political representation of the social unrest that crossed the country in those years: the PCI representing himself as the only political force capable of mediating between social movements and institutions; the Radical Left-Wing Groups as «avant-garde» of a unfeasible «revolutionary» project.
An exotic Deligne-Langlands correspondence for symplectic groups
Creators: name: Kato, Syu
Publisher: name: arXiv
Year: 2006
Subjects: subject: Representation Theory (math.RT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics

description: Let G be a complex symplectic group. We introduce a G x (C ^x) ^{l + 1}-variety N_{l}, which we call the l-exotic nilpotent cone. Then, we realize the Hecke algebra H of type C_n ^(1) with three parameters via equivariant algebraic K-theory in terms of the geometry of N_2. This enables us to establish a Deligne-Langlands type classification of "non-critical" simple H-modules. As applications, we present a character formula and multiplicity formulas of H-modules.
description: v7, 52pages. Corrected typos and errors in the proofs of Lemma 4.1 and Theorem 6.2 modulo Proposition 6.7, final version, accepted for publication in Duke Math
First records of Attagenus smirnovi Zhantiev, 1973 from Italy in South Tyrol (Coleoptera: Dermestidae)
Creators: name: Guariento, Elia
name: Colla, Filippo
name: Steinwandter, Michael
name: Háva, Jiří
name: Seeber, Julia
Publisher: name: Fragmenta Entomologica
Year: 2019

description: The Dermestidae species Attagenus smirnovi Zhantiev, 1973 was discovered in two household in South Tyrol, making it the first official records for this species in Italy. The larvae feeds upon dried organic materials, making this species a common pest in museum collections and households in Central and Northern Europe. The spread of A. smirnovi in Italy was expected but has not yet been recorded. Further, developments of its distribution need to be monitored to prevent damaging infestations, especially to museum collections.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
Critical behavior of weakly disordered Ising model: Six-loop $\sqrt \varepsilon$ expansion study
Creators: name: Kompaniets, M. V.
name: Kudlis, A.
name: Sokolov, A. I.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The critical behavior of three-dimensional weakly diluted quenched Ising model is examined on the base of six-loop renormalization group expansions obtained within the minimal subtraction scheme in $4-ε$ space dimensions. For this purpose the $ϕ^4$ field theory with cubic symmetry was analyzed in the replica limit $n\rightarrow 0$. Along with renormalization group expansions in terms of renormalized couplings the $\sqrt{\varepsilon}$ expansions of critical exponents are presented. Corresponding numerical estimates for the physical, three-dimensional system are obtained by means of different resummation procedures applied both to the $\sqrt{\varepsilon}$ series and to initial renormalization group expansions. The results given by the latter approach are in a good agreement with their counterparts obtained experimentally and within the Monte Carlo simulations, while resumming of $\sqrt{\varepsilon}$ series themselves turned out to be disappointing.
Insights into the late-Sixties taxocenosis of Oniscidea from the Pontine islands (West Mediterranean) (Peracarida: Isopoda)
Creators: name: Gentile, Gabriele
name: Argano, Roberto
name: Taiti, Stefano
Publisher: name: Fragmenta Entomologica
Year: 2019

description: We report and discuss faunistic data of Oniscidea inhabiting the Pontine islands, a group of five small volcanic islands and several islets in the Tyrrhenian Sea, located about 60 km from the Italian mainland. Data here presented were primarily obtained from the examination of the material collected during a three-year (1965-1968) research program supported by the Italian National Council of Research and aimed at investigating Mediterranean small island faunas, including Oniscidea. Despite the sampling was not specifically directed at Oniscidea, these data may provide insights into the structure of the Oniscidean taxocenosis of the islands as it existed fifty years ago. Thirty-five species belonging to 11 families, 8 ecological and 7 biogeographical classes were found on these islands. Such number of species of Oniscidea is very high, if we consider the low number of islands and their small sizes. Changes in climate and environmental conditions occurred in the last fifty years would call for a new investigation.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
Kepler problem in Dirac theory for a particle with position-dependent mass
Creators: name: Vakarchuk, I. O.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Exact solution of Dirac equation for a particle whose potential energy and mass are inversely proportional to the distance from the force centre has been found. The bound states exist provided the length scale $a$ which appears in the expression for the mass is smaller than the classical electron radius $e^2/mc^2$. Furthermore, bound states also exist for negative values of $a$ even in the absence of the Coulomb interaction. Quasirelativistic expansion of the energy has been carried out, and a modified expression for the fine structure of energy levels has been obtained. The problem of kinetic energy operator in the Schrödinger equation is discussed for the case of position-dependent mass. In particular, we have found that for highly excited states the mutual ordering of the inverse mass and momentum operator in the non-relativistic theory is not important.
description: 9 pages
Cosmological constraints of Palatini $f(\mathcal{R})$ gravity
Creators: name: Gomes, Débora Aguiar
name: Briffa, Rebecca
name: Kozak, Aleksander
name: Said, Jackson Levi
name: Saal, Margus
name: Wojnar, Aneta
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this study, we investigate a Palatini $f(R)$ gravity model featuring a quadratic term correction, aligning it with the most recent expansion rate data, with a particular focus on the latest SNIa and BAO data. Our analysis employs CC data as the fundamental dataset, complemented by contributions from the SN sample and a combination of non-overlapping transversal BAO datasets. We conduct a comprehensive MCMC analysis for each data set combination, yielding constraints on all cosmological parameters within the model. Additionally, we incorporate the latest Hubble constant value from the SH0ES Team. Finally, we present a statistical comparison between the Palatini quadratic model and $Λ$CDM using the AIC and BIC metrics, ultimately obtaining the constraint $|α| \leq 10^{49}\,\text{m}^2$. We also stress the significance of studying stellar and substellar objects for obtaining more precise constraints on modified gravity compared to those derived from cosmological observations.
description: 19 pages, 3 figures
Dust evolution in zoom-in cosmological simulations of galaxy formation
Creators: name: Granato, Gian Luigi
name: Ragone-Figueroa, Cinthia
name: Taverna, Antonela
name: Silva, Laura
name: Valentini, Milena
name: Borgani, Stefano
name: Monaco, Pierluigi
name: Murante, Giuseppe
name: Tornatore, Luca
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present cosmological zoom-in hydro-dynamical simulations for the formation of disc galaxies, implementing dust evolution and dust promoted cooling of hot gas. We couple an improved version of our previous treatment of dust evolution, which adopts the two-size approximation to estimate the grain size distribution, with the MUPPI star formation and feedback sub-resolution model. Our dust evolution model follows carbon and silicate dust separately. To distinguish differences induced by the chaotic behaviour of simulations from those genuinely due to different simulation set-up, we run each model six times, after introducing tiny perturbations in the initial conditions. With this method, we discuss the role of various dust-related physical processes and the effect of a few possible approximations adopted in the literature. Metal depletion and dust cooling affect the evolution of the system, causing substantial variations in its stellar, gas and dust content. We discuss possible effects on the Spectral Energy Distribution of the significant variations of the size distribution and chemical composition of grains, as predicted by our simulations during the evolution of the galaxy. We compare dust surface density, dust-to-gas ratio and small-to-big grain mass ratio as a function of galaxy radius and gas metallicity predicted by our fiducial run with recent observational estimates for three disc galaxies of different masses. The general agreement is good, in particular taking into account that we have not adjusted our model for this purpose.
description: 21 pages, 15 figures, MNRAS, accepted
Contribution to the knowledge of the genus Clanoptilus Motschulsky, 1854 in Italy (Coleoptera: Cleroidea, Malachiidae)
Creators: name: Franzini, Gabriele
Publisher: name: Fragmenta Entomologica
Year: 2019

description: In this paper, the species of the genus Clanoptilus Motschulsky, 1854 mentioned for the Italian territory are reviewed. Two separate keys are provided for identification of males and females. For each species a discussion of taxonomic status and distribution in Italy, and the list of localities of studied specimens are also presented. Clanoptilus affinis subconcolor (Pic, 1911) and Clanoptilus spinipennis brevispina (Kiesenwetter, 1871) are tentatively proposed as valid subspecies or separate semi-species. The new synonymy Clanoptilus bellieri (Peyron, 1877) = Clanoptilus transadriaticus (Evers, 1970) is also proposed.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
Spin-waves in antiferromagnetic single crystal LiFePO$_4$
Creators: name: Li, Jiying
name: Garlea, Vasile O.
name: Zarestky, Jerel L.
name: Vaknin, David
Publisher: name: arXiv
Year: 2005
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Spin-wave dispersions in the antiferromagnetic state of single crystal LiFePO$_4$ were determined by inelastic neutron scattering measurements. The dispersion curves measured from the (010) reflection along both {\it a}$^\ast$ and {\it b}$^\ast$ reciprocal-space directions reflect the anisotropic coupling of the layered Fe$^{2+}$ (S = 2) spin-system. The spin-wave dispersion curves were theoretically modeled using linear spin-wave theory by including in the spin-Hamiltonian in-plane nearest- and next-nearest-neighbor interactions ({\it J}$_1$ and {\it J}$_2$), inter-plane nearest-neighbor interactions ({\it J}$_\bot$) and a single-ion anisotropy ({\it D}). A weak (010) magnetic peak was observed in elastic neutron scattering studies of the same crystal indicating that the ground state of the staggered iron moments is not along (010) direction, as previously reported from polycrystalline samples studies, but slightly rotated away from this axis.
Perturbation theory for optical excitations in the one-dimensional extended Peierls--Hubbard model
Creators: name: Grage, Anja
name: Gebhard, Florian
name: Rissler, Joerg
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: For the one-dimensional, extended Peierls--Hubbard model we calculate analytically the ground-state energy and the single-particle gap to second order in the Coulomb interaction for a given lattice dimerization. The comparison with numerically exact data from the Density-Matrix Renormalization Group shows that the ground-state energy is quantitatively reliable for Coulomb parameters as large as the band width. The single-particle gap can almost triple from its bare Peierls value before substantial deviations appear. For the calculation of the dominant optical excitations, we follow two approaches. In Wannier theory, we perturb the Wannier exciton states to second order. In two-step perturbation theory, similar in spirit to the GW-BSE approach, we form excitons from dressed electron-hole excitations. We find the Wannier approach to be superior to the two-step perturbation theory. For singlet excitons, Wannier theory is applicable up to Coulomb parameters as large as half band width. For triplet excitons, second-order perturbation theory quickly fails completely.
description: 32 pages, 12 figures, submtted to JSTAT