cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Imagining igorots : performing ethnic and gender identities on the Philippine Cordillera Central
Creators: name: McKay, Deirdre Christian
Publisher: name: University of British Columbia
Year: 2009

description: Gender, ethnicity, landscape, nation — none exist as real places or categories but as the effect of various practices that bring bodies and spaces into being. This dissertation attempts to rethink concepts of gender and ethnicity away from traditional ideas of places and cultures. To do so, it embeds them within social practice as performatives emerging from the colonial encounter. The text reports on ethnographic field research among Igorot communities originating on the Philippine Cordillera Central. By applying Burawoy's extended case method to local narratives of identity, history and migration, the argument extends theorizations of locality and gendered subaltern agency. The analysis locates the imaginative work that produces local places, subject positions and subjectivities within a palimpsest of transnational discourses, outmigration and local innovations. Locality and subjectivity are shown to be embedded in and produced by both local experiences and global identifications of difference originating within colonial histories. In narrating and dis-placing colonial stories of places and people, the power of these discourses on gender and ethnicity to constitute subjects with coherent names is challenged. By tracing the-persistence of the colonial past in the apparently de-colonized present, this text suggests that the concepts of performance and naming can help to make greater theoretical and empirical sense of the (post)colonial world.
Emission characteristics of quantum dots in planar microcavities
Creators: name: Ramon, G.
name: Mizrahi, U.
name: Akopian, N.
name: Braitbart, S.
name: Gershoni, D.
name: Reinecke, T. L.
name: Gerardot, B.
name: Petroff, P. M.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The emission properties of single quantum dots in planar microcavities are studied experimentally and theoretically. Fivefold Enhanced spontaneous emission outside the microcavity is found for dots in resonance with the cavity mode, relative to detuned dots, while their radiative lifetime is only marginally decreased. Using high power excitation we obtain the in-plane cavity dispersion. Near field images of the emission show spatial distributions of several microns for resonant dots, which decrease in size with the detuning from resonance. These experimental findings are explained using a simple and intuitive model.
Random walks and the Hagedorn transition
Creators: name: Kruczenski, Martin
name: Lawrence, Albion
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study details of the approach to the Hagedorn temperature in string theory in various static spacetime backgrounds. We show that the partition function for a {\it single} string at finite temperature is the torus amplitude restricted to unit winding around Euclidean time. We use the worldsheet path integral to derive the statement that the the sum over random walks of the thermal scalar near the Hagedorn transition is precisely the image under a modular transformation of the sum over spatial configurations of a single highly excited string. We compute the radius of gyration of thermally excited strings in $AdS_D\times S^n$. We show that the winding mode indicates an instability despite the AdS curvature at large radius, and that the negative mass squared decreases with decreasing AdS radius, much like the type 0 tachyon. We add further arguments to statements by Barbon and Rabinovici, and by Adams {\it et. al.}, that the Euclidean AdS black hole can thought of as a condensate of the thermal scalar. We use this to provide circumstantial evidence that the condensation of the thermal scalar decouples closed string modes.
description: 34 pages (7 of references), 5 figures. v2: Reference added, grant acknowledgement added, typos corrected
Constitutional Obstacles to Organised Marketing in Australia
Creators: name: Coper, Michael
name: Coper, Michael
Publisher: name: Unknown
Year: 1978
Subjects: subject: Marketing
subject: FOS: Economics and business

description: The famous (or infamous) command in section 92 of the Australian Constitution that interstate trade and commerce shall be "absolutely free" is only one of the many constitutional restrictions which bedevil organised marketing in Australia. The author, a constitutional lawyer, explains the impact of the Constitution upon organised marketing, and in language accessible to non-lawyers, unravels some of the complexities of the judge-made law of the Constitution. In addition to setting out what the law is, the paper attempts to convey the rationale behind the various constitutional provisions and the reasons behind the diversity of opinion in their interpretation. The paper concludes by examining the prospects for constitutional change.
A new genus and species of Mesostylini Reitter, 1913 (Coleoptera: Curculionidae)
Creators: name: Colonnelli, Enzo
name: Paladini, Alessandro
Publisher: name: Fragmenta Entomologica
Year: 2019

description: Is described the new genus Viridistylus n. gen. and its type species Viridistylus robustus n. sp. from Tajikistan belonging to the entimine tribe Mesostylini. A key to the genera of Mesostylini thus far known, and illustration of the new species are included.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
Estimation of a General Class of Demand Functions for Meat in Australia
Creators: name: Johnson, Lester W.
name: Johnson, Lester W.
Publisher: name: Unknown
Year: 1978
Subjects: Demand and Price Analysis

description: Australian demand for meat and beef equations are estimated using a generalised functional form developed by Box and Cox. On the surface, results do not allow rejection of the usual double-log specification commonly used, but possible reasons for this are suggested. More encouraging is that estimated income elasticities for beef are seen generally to decline over the sample period, a result more in line with a priori expectations. Finally, possible extensions of our work are suggested.
Improvements on dipole shower colour
Creators: name: Holguin, Jack
name: Forshaw, Jeffrey R.
name: Plätzer, Simon
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The dipole formalism provides a powerful framework from which parton showers can be constructed. In a recent paper, we proposed a dipole shower with improved colour accuracy and in this paper we show how it can be further improved. After an explicit check at $\mathcal{O}(α_{\mathrm{s}}^{2})$ we confirm that our original shower performs as it was designed to, i.e. inheriting its handling of angular-ordered radiation from a coherent branching algorithm. We also show how other dipole shower algorithms fail to achieve this. Nevertheless, there is an $\mathcal{O}(α_{\mathrm{s}}^{2})$ topology where it differs at sub-leading $N_{\mathrm{c}}$ from a coherent branching algorithm. This erroneous topology can contribute a leading logarithm to some observables and corresponds to emissions that are ordered in $k_t$ but not angle. We propose a simple, computationally efficient way to correct this and assign colour factors in accordance with the coherence properties of QCD to all orders in $α_{\mathrm{s}}$.
description: 26 pages, 2 appendices, 9 figures. Version 2 contains small changes and is inline with the version published in EPJ C
Reactive Synthesis of Smart Contract Control Flows.
Creators: name: Finkbeiner, Bernd
name: Hofmann, Jana
name: Kohn, Florian
name: Passing, Noemi
Publisher: name: CISPA
Year: 2024

description: Smart contracts are small but highly error-prone programs that implement agreements between multiple parties. We present a reactive synthesis approach for the automatic construction of smart contract state machines. Towards this end, we extend temporal stream logic (TSL) with universally quantified parameters over infinite domains. Parameterized TSL is a convenient logic to specify the temporal control flow, i.e., the correct order of transactions, as well as the data flow of the contract's fields. We develop a two-step approach that 1) synthesizes a finite representation of the - in general - infinite-state system and 2) splits the system into a compact hierarchical architecture that enables the implementation of the state machine in Solidity. We implement the approach in our prototype tool SCSynt, which - within seconds - automatically constructs Solidity code that realizes the specified control flow.
Shot noise in the chaotic-to-regular crossover regime
Creators: name: Aigner, F.
name: Rotter, S.
name: Burgdorfer, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the shot noise for phase-coherent quantum transport in the chaotic-to-regular crossover regime. Employing the Modular Recursive Green's Function Method for both ballistic and disordered two-dimensional cavities we find the Fano factor and the transmission eigenvalue distribution for regular systems to be surprisingly similar to those for chaotic systems. We argue that in the case of regular dynamics in the cavity, diffraction at the lead openings is the dominant source of shot noise. We also explore the onset of the crossover from quantum to classical transport and develop a quasi-classical transport model for shot noise suppression which agrees with the numerical quantum data.
description: 4 pages, 3 figures, submitted to Phys.Rev.Lett
The jewel beetle Lamprodila (Palmar) festiva Linné, 1767, a new invasive urban pest of Cupressaceae in Cluj area (Romania) (Coleoptera: Buprestidae)
Creators: name: Bunescu, Horia
name: Florian, Teodora
Publisher: name: Fragmenta Entomologica
Year: 2019

description: The jewel beetle Lamprodila festiva (Linné, 1767), in natural habitats of S Europe originally associated with Juniperus spp. (Juniper; Cupressaceae), has been recorded as a recent invasive pest in several European areas, affecting different genera of these coniferous trees and spreading rapidly during the last few years in many countries of Europe. The research was carried out in 2017-2018 in Cluj-Napoca area (Romania), in field and laboratory conditions. The aim of our studies was to identify and study some populations of this new invasive pest occurring in urban areas of NW Romania.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
Welfare Effects of and Supply Responses to Recent Australian Agricultural Policy Changes
Creators: name: Fraser, Rob W.
name: Fraser, Rob W.
Publisher: name: Unknown
Year: 1993
Subjects: Agricultural and Food Policy

description: This paper examines the joint impact of wheat market deregulation and removal of the wool Reserve Price Scheme on Australian wheatbelt farmers using a simple model of land allocation between the two products and empirical details of the impact of the two policy changes on farmers' uncertain economic environment. It is shown that key parameters are wool micronage, wheat yield variability and the presence or not of a wool price ceiling due to stockpile disposal. Consequently, important regional differences in welfare impacts and supply responses may exist and these may be of significance to the mechanics of stockpile disposal.
AdS black hole thermodynamics and microstructures from $f(Q)$ gravitation
Creators: name: Sokoliuk, Oleksii
name: Pradhan, Sneha
name: Baransky, Alexander
name: Sahoo, P. K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The significant properties and phase transition of charged Anti-de Sitter (AdS) black holes have been extensively studied in a variety of modified theories of gravity in the presence of numerous matter fields. The goal of our current research is to investigate the AdS black hole's thermodynamics under the impact of $f(Q)$ gravity. Additionally, this paper explores the black hole's local stability and phase structure under the relevant gravity. Besides, we use Ruppeiner geometry to look into the AdS black hole's microscopic structure. We have numerically computed the Ricci curvature scalar $R$ to explain the interactions between the AdS black hole's microscopic particles under the influence of $f(Q)$ gravity.
description: Fortschr. Phys. published version
Using Auctions for Pollution Rights as Indirect Incentives for Investments in Green Technologies
Creators: name: Fadaee, Mehdi
name: Lambertini, Luca
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-P/01 Economia politica

description: Acquired wisdom has it that the allocation of pollution rights to firms hinders their willingness to undertake uncertain R&D projects for environmental-friendly technologies. We revisit this issue in a model where firms strategically choose whether to participate in an auction to attain pollution permits, or instead invest in green R&D, to show that, somewhat counterintuitively, a side effect of the auction is in fact that of fostering environmental R&D in an admissible range of the model parameters.
Optimization of Radar Parameters for Maximum Detection Probability Under Generalized Discrete Clutter Conditions Using Stochastic Geometry
Creators: name: Ram, Shobha Sundar
name: Singh, Gaurav
name: Ghatak, Gourab
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We propose an analytical framework based on stochastic geometry (SG) formulations to estimate a radar's detection performance under generalized discrete clutter conditions. We model the spatial distribution of discrete clutter scatterers as a homogeneous Poisson point process and the radar cross-section of each extended scatterer as a random variable of the Weibull distribution. Using this framework, we derive a metric called the radar detection coverage probability as a function of radar parameters such as transmitted power, system noise temperature and radar bandwidth; and clutter parameters such as clutter density and mean clutter cross-section. We derive the optimum radar bandwidth for maximizing this metric under noisy and cluttered conditions. We also derive the peak transmitted power beyond which there will be no discernible improvement in radar detection performance due to clutter limited conditions. When both transmitted power and bandwidth are fixed, we show how the detection threshold can be optimized for best performance. We experimentally validate the SG results with a hybrid of Monte Carlo and full wave electromagnetic solver based simulations using finite difference time domain (FDTD) techniques.
Structural Change in the Demand for Differentiated Meat Products in Sydney
Creators: name: Gorny, Rachel A.
name: Ahmadi-Esfahani, Fredoun Z.
name: Gorny, Rachel A.
name: Ahmadi-Esfahani, Fredoun Z.
Publisher: name: Unknown
Year: 1993
Subjects: Demand and Price Analysis

description: Concerns about the recent trends away from the consumption of red meat have led to tests for structural change in demand. These tests have typically treated the individual meats as homogeneous commodities. This article uses disaggregated data to test for structural change in the demand for differentiated meat products in Sydney over the seasons from winter 1987 to autumn 1991 using a revealed preference approach. The results fail to provide any evidence of structural change.
Description of the female of Xiphodontus endroedyi Bartolozzi, 2005 (Coleoptera: Lucanidae)
Creators: name: Bartolozzi, Luca
name: Perissinotto, Renzo
name: Clennell, Lynette
Publisher: name: Fragmenta Entomologica
Year: 2019

description: The female of Xiphodontus endroedyi Bartolozzi, 2005 is described for the first time. The new locality record for this species shows that it actually has a wide distribution range across the Cape Floral Region, in the Fynbos Biome. Both larvae and adults were found boring into dead wood at the base of senescent trunks of a variety of Proteaceae species, including the alien invasive Hakea sericea.
description: Fragmenta Entomologica, Vol. 51 No. 2 (2019)
The Profitability of Small Horizontal Mergers with Nonlinear Demand Functions
Creators: name: Esfahani, Hamideh
name: Lambertini, Luca
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-P/01 Economia politica

description: We want to take a differential game approach with price dynamics to conduct an investigation into the consequences of horizontal merger of firms where the demand function is nonlinear. We take into consideration the open-loop equilibrium. We show that in relation to the fact that the demand is nonlinear and prices follow some stickiness an incentive for small merger exists, while it does not appear under the standard approach using a linear demand function.
Frustration-induced Dodecamer Ordering in the Double-Exchange Spin Ice Model on the Kagomé Lattice
Creators: name: Shimomura, Yoshihiro
name: Miyahara, Shin
name: Furukawa, Nobuo
Publisher: name: arXiv
Year: 2005
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate a detail of a dodecamer cluster ordering in a double-exchange spin ice model on a kagomé lattice. In frustrated systems, ordinary spin orderings are suppressed and macroscopic degeneracy remains down to low temperatures. In some frustrated systems, the degeneracy is lifted due to residual interactions and cluster orderings are stabilized. In the present model, the spin ice state is first formed at intermediate temperatures, and further entropies are released at lower temperatures as the dodecamer phase emerges. Since the spin symmetry is not broken in the dodecamer phase, there still exists macroscopic degeneracy. At further low temperatures, a possible spin ordering due to inter-dodecamer interactions is proposed. We discuss that such a multiple-site clustering larger than a bond-pair might be generic to frustrated systems where macroscopic degeneracy is lifted by residual interactions.
description: 18 pages, 11 figures
Fauna ibérica. Vol. 44, Coleoptera: Hydraenidae
Creators: name: Sabatelli, Simone
name: Trizzino, Marco
name: De Biase, Alessio
name: Audisio, Paolo
Publisher: name: Fragmenta Entomologica
Year: 2019

description: Not available
description: Fragmenta Entomologica, Vol. 51 No. 1 (2019)
Universal Class of Type-IIB Flux Vacua with Analytic Mass Spectrum
Creators: name: Blanco-Pillado, Jose J.
name: Sousa, Kepa
name: Urkiola, Mikel A.
name: Wachter, Jeremy M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We report on a new class of flux vacua generically present in Calabi-Yau compactifications of type-IIB string theory. At these vacua, the mass spectrum of the complete axio-dilaton/complex structure sector is given, to leading order in $α'$ and $g_s$, by a simple analytic formula independent of the choice of Calabi-Yau. We provide a method to find these vacua, and construct an ensemble of $17,054$ solutions for the Calabi-Yau hypersurface $\mathbb{WP}_{[1,1,1,6,9]}^4$, where the masses of the axio-dilaton and the $272$ complex structure fields can be explicitly computed.
description: 10 pages, 5 figures; v2: fixed typos, added references; v3: fixed typos, added appendix on estimate of the number of vacua
Psammoecus trimaculatus Motschulsky, 1858, new to the Italian fauna (Cucujoidea: Silvanidae)
Creators: name: Mola, Livio
name: Yoshida, Takahiro
Publisher: name: Fragmenta Entomologica
Year: 2019

description: This paper reports for the first time Psammoecus trimaculatus Motschulsky, 1858 (Silvanidae) for the Italian fauna. The species, previously known for Europe from the Caucasian region only, was collected in Brescia province (Lombardy, N Italy).
description: Fragmenta Entomologica, Vol. 51 No. 1 (2019)
Co-Production and Managed Competition in Mixed Quasi-markets
Creators: name: Delbono, Flavio
name: Lanzi, Diego
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-P/01 Economia politica

description: In this paper, we provide a very simple model to shed light on the
issue of managed competition in mixed quasi-markets (i.e. regulated markets
in which social and for-proÖt Örms coexist).  In doing this, we consider the
literature on mixed oligopolies as a reasonable reference point and try to enrich it
with the idea of quasi-market. Firstly, our results show that social Örms serve the
relatively richer portion of the population. Only relatively poor consumers buy
units of service from the proÖt-oriented Örm. Secondly, the socially-preferable
form of managed competition is to introduce coproduction practices and, hence,
to raise proÖt-oriented Örmís production costs. The diffusion of coproduction paradigms ensures maximal service quality and eliminates mark-up from the market.
Discovering Production and Supply Relationships: Present Status and Future Opportunities
Creators: name: Just, Richard E.
name: Just, Richard E.
Publisher: name: Unknown
Year: 1993
Subjects: Demand and Price Analysis

description: In this paper the current state of supply modelling in agriculture is reviewed. It is argued that (I) the stock of knowledge of elasticities is depreciating, (2) historical estimates are misleading because many phenomena are confounded in few parameters, (3) available data are not being efficiently exploited, and (4) a proliferation of hypotheses is leading to an inability to discriminate in an appropriately comprehensive context. The latter problem is leading to an inability to do forward-looking analyses. Several suggestions are made for dealing with these problems that involve some relaxation of the standard of objectivity which in reality is unattainable in many kinds of practical applied work.
Psylliodes shirensis, a new replacement name for Psylliodes shira Biondi and D'Alessandro (Coleoptera: Chrysomelidae)
Creators: name: Biondi, Maurizio
name: D'Alessandro, Paola
Publisher: name: Fragmenta Entomologica
Year: 2019

description: Not available
description: Fragmenta Entomologica, Vol. 51 No. 1 (2019)
Meeting at School. Assortative Matching in Partnerships and Over-Education
Creators: name: Tampieri, Alessandro
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-P/01 Economia politica

description: This paper argues that assortative matching may explain over-education. Education determines individuals' income and, due to the presence of assortative matching, the quality of the partner, who can be a colleague or a spouse. Thus an individual acquires some education to improve the expected partner's quality. But since everybody does that, the partner's quality does not increase and over-education emerges. Tax progression to correct over-education has ambiguous effects on the educational incentives according to the individuals' ability. We test the model using the British Household Panel Survey. The empirical results support our theoretical findings.
Ground state energy of spin-1/2 fermions in the unitary limit
Creators: name: Lee, Dean
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present lattice results for the ground state energy of a spin-1/2 fermion system in the unitary limit, where the effective range of the interaction is zero and the scattering length is infinite. We compute the ground state energy for a system of 6, 10, 14, 18, and 22 particles, with equal numbers of up and down spins in a periodic cube. We estimate that in the limit of large number of particles, the ground state energy is 0.25(3) times the ground state energy of the free Fermi system.
description: 17 pages, 9 figures, expanded manuscript includes more data and cross-checks
The effects of environmental taxes and quotas on the optimal timing of emission reductions under Choquet-Brownian uncertainty
Creators: name: Agliardi, Elettra
name: Sereno, Luigi
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-P/01 Economia politica

description: The effects of two environmental policy options for the reduction of pollution emissions, i.e. taxes and non-tradable quotas, are analyzed. In contrast to the prior literature this work endogenously takes into account the level of emissions before and after the adoption of the new environmental policy. The level of emissions is determined by solving the firm's profit maximization problem under taxes and fixed quotas. We find that the optimal adoption threshold under taxes is always larger than the adoption threshold under fixed quota, even in a setting characterized by ecological uncertainty and ambiguity - in the form of Choquet-Brownian motions - on future costs and benefits over adopting environmental policies.
Certification Aspects of Runtime Assurance for Urban Air Mobility
Creators: name: Torens, Christoph
name: Nagarajan, Pranav
name: Schirmer, Sebastian
name: Dauer, Johann
name: Baumeister, Jan
name: Kohn, Florian
name: Finkbeiner, Bernd
name: Manfredi, Guido
name: Löhr, Florian
Publisher: name: CISPA
Year: 2024

description: The transition towards autonomous operations for Urban Air Mobility introduces significant safety challenges, necessitating novel safety assurance strategies. One such strategy is runtime assurance, which ensures the safe behavior of a system during its actual operation. This can be implemented by using a safety monitor that detects unsafe behaviors and then activates a switch to a recovery function to return the system to a safe state. This paper investigates the certification aspects of runtime monitoring, a core component of runtime assurance. We analyze the regulatory framework of urban air mobility, and discuss implications of aviation software standards such as DO-178C and it supplements on runtime assurance. As a concrete example to discuss, Detect-and-Avoid is introduced and motivated from the requirements of the Minimum Operational Performance Standards. The use case is analyzed from a system and a software perspective. From a system perspective, the architecture is compared to the runtime assurance standard practice published by ASTM International. From a software perspective, we assess the stream-based specification language RTLola against the development assurance objectives in the de-facto software development standard DO-178C. As an example, we highlight the role of traceability between the different levels of software requirements. The goal of this research is to illustrate the use of runtime monitoring in the context of certification for Urban Air Mobility applications to improve operational safety and enable increasing levels of automation.
Impact of a mean field dynamo on neutron star mergers leading to magnetar remnants
Creators: name: Most, Elias R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We investigate the impact of a mean field model for the $αΩ$-dynamo potentially active in the post-merger phase of a binary neutron star coalescence. We do so by deriving equations for ideal general relativistic magnetohydrodynamics (GRMHD) with an additional $α-$term, which closely resemble their Newtonian counterpart, but remain compatible with standard numerical relativity simulations. We propose a heuristic dynamo closure relation for the magnetorotational instability-driven turbulent dynamo in the outer layers of a differentially rotating magnetar remnant and its accretion disk. As a first demonstration, we apply this framework to the early stages of post-merger evolution ($\lesssim 50\, \rm ms$). We demonstrate that depending on the efficacy of the dynamo action, magnetically driven outflows can be present with their amount of baryon loading correlating with the magnetic field amplification. These outflows can also contain precursor flaring episodes before settling into a quasi-steady state. For the dynamo parameters explored in this work, we observe electromagnetic energy fluxes of up to $10^{50}\, \rm erg/s$, although larger amplification parameters will likely lead to stronger fluxes. Our results are consistent with the expectation that substantial dynamo amplification (either during or after the merger) may be necessary for neutron-star remnants to power short gamma-ray bursts or precursors thereof.
description: 14 pages, 12 figures
Self-consistent response of a galactic disc to vertical perturbations
Creators: name: Saha, Kanak
name: Jog, Chanda J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the self-consistent, linear response of a galactic disc to vertical perturbations as induced say by a tidal interaction. We calculate the self-gravitational potential corresponding to a non-axisymmetric, self-consistent density response of the disc using the Green's function method. The response potential is shown to oppose the perturbation potential because the self-gravity of the disc resists the imposed potential, and this resistence is stronger in the inner parts of a galactic disc. For the m=1 azimuthal wavenumber, the disc response opposes the imposed perturbation upto a radius that spans a range of 4-6 disc scale-lengths, so that the disc shows a net warp only beyond this region. This physically explains the well-known but so far unexplained observation (Briggs 1990) that warps typically set in beyond this range of radii. We show that the inclusion of a dark matter halo in the calculation only marginally changes (by ~ 10 %) the radius for the onset of warps. For perturbations with higher azimuthal wavenumbers, the net signature of the vertical perturbations can only be seen at larger radii - for example beyond 7 exponential disc scale-lengths for m=10. Also, for high m cases, the magnitude of the negative disc response due to the disc self-gravity is much smaller. This is shown to result in corrugations of the mid-plane density, which explains the puzzling scalloping with m=10 detected in HI in the outermost regions ~ 30 kpc in the Galaxy by Kulkarni et al. (1982).
description: 10 pages, 5 figures, accepted for publication in MNRAS
Comparative Advantage Under Monopoly: A Note On the Role of Market Power
Creators: name: Bacchiega, Emanuele
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-P/01 Economia politica

description: We argue that it is the number of agents holding market power, rather than the presence of market power itself, that may force Ricardian economies into autarchy. We apply the concepts of monopoly equilibrium by Baldwin (1948) to the model of Cordella and Gabszewicz (1997) to show that, differently from the oligopoly case, trade always arises at a monopoly equilibrium whereas autarchy is never an outcome. As a consequence, monopoly Pareto-dominates oligopoly.
Corporate Social Responsibility in a Mixed Oligopoly
Creators: name: Lambertini, Luca
name: Tampieri, Alessandro
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-P/01 Economia politica

description: This paper investigates how CSR firms influence a Cournot oligopoly with pollution. We define as CSR a firm that takes into account not only its profits but also internalises its own share of the externality and is sensitive to consumer surplus. The CSR firm obtains higher profits compared to profit-seeking firms. Also, the presence of at least one CSR firm improves social welfare and makes the first best Pigouvian taxation more lenient for Cournot firms. Finally, the CSR firm may induce the other firms to invest in green technology.
New aspects of Argyres--Douglas theories and their dimensional reduction
Creators: name: Giacomelli, Simone
name: Mekareeya, Noppadol
name: Sacchi, Matteo
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Argyres-Douglas (AD) theories constitute an infinite class of superconformal field theories in four dimensions with a number of interesting properties. We study several new aspects of AD theories engineered in $A$-type class $\mathcal{S}$ with one irregular puncture of Type I or Type II and also a regular puncture. These include conformal manifolds, structures of the Higgs branch, as well as the three dimensional gauge theories coming from the reduction on a circle. The latter admit a description in terms of a linear quiver with unitary and special unitary gauge groups, along with a number of twisted hypermultiplets. The origin of these twisted hypermultiplets is explained from the four dimensional perspective. We also propose the three dimensional mirror theories for such linear quivers. These provide explicit descriptions of the magnetic quivers of all AD theories in question in terms of quiver diagrams with unitary gauge groups, together with a collection of free hypermultiplets. A number of quiver gauge theories presented in this paper are new and have not been studied elsewhere in the literature.
description: 66 pages. minor revisions and references added, JHEP version
Government Spending Under Non-Separability: a Theoretical Analysis
Creators: name: Marattin, Luigi
name: Palestini, Arsen
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2010
Subjects: SECS-P/01 Economia politica

description: In this paper we derive analytic implicit form conditions for the qualitative analysis of government spending multipliers and the optimal level of government spending in presence of non-separability between private and public components of aggregate demand. Using the simplest neo-classical flexible price model with no capital accumulation, we show that Edgeworth dependence is not a suitable condition to utomatically assess the signs of the consumption and income multipliers, for which a more complex analysis must be carried out. We propose a detailed investigation of the form and the characteristics of the involved utility functions, which are crucial to such evaluation. We also show that if Edgeworth complementarity is strong enough, a public spending stimulus can raise at the same time private consumption and real activity. In order to reconcile our general framework with existing literature, we discuss recent examples of non-separable functional forms from the standpoint of our results, and argue that their consistency relies on specific assumptions about steady- state points.
A critical review of the odonate fauna of Trentino: annotated check-list and new relevant data for Italy (Insecta: Odonata)
Creators: name: Assandri, Giacomo
Publisher: name: Fragmenta Entomologica
Year: 2019

description: By the first half of the Twentieth Century, the Odonate fauna of Trentino (Oriental Alps, Italy) was quite well known; subsequently, few surveys on dragonflies were carried out, resulting in a limited update of the knowledge on this taxon. The aim of this study is to provide a critical and annotated check-list of the Odonata of this province for the period from 1851 to 2018. This synthesis is based on a total of 3814 records obtained from the literature (955 records), revision of collections (1048 records), and unpublished recent data (1811 records). An updated and comprehensive Odonatological bibliography of the region is also provided. Overall, sixty-one species were confirmed to occur (or have occurred) in Trentino. These represent the 64% of the species recorded in Italy and the 43% of the species recorded in Europe. Presence of five additional species (Ceriagrion tenellum, Coenagrion lunulatum, C. ornatum, Ophiogomphus cecilia, and Epitheca bimaculata) should be considered doubtful for Trentino. Further two species (Platycnemis latipes and Onychogomphus uncatus) have to be excluded from the fauna of the study area. Fifty-four species were recorded also after 2000, whereas seven species were not confirmed after this year (Lestes dryas, L. virens, L. barbarus, Sympecma paedisca, Coenagrion scitulum, Brachytron pratense, and Sympetrum flaveolum). Several new records resulting from this study (referred to: Erythromma najas, Aeshna subarctica, Aeshna caerulea, Aeshna grandis, Leucorrhinia pectoralis) have a conservation or biogeographical relevance which transcends the borders of the study area, being noteworthy from an Italian or Alpine perspective and are thus commented in detail. Taxonomic notes on subspecies are also given when relevant.
description: Fragmenta Entomologica, Vol. 51 No. 1 (2019)
Fairness Hacking: The Malicious Practice of Shrouding Unfairness in Algorithms
Creators: name: Meding, Kristof
name: Hagendorff, Thilo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Fairness in machine learning (ML) is an ever-growing field of research due to the manifold potential for harm from algorithmic discrimination. To prevent such harm, a large body of literature develops new approaches to quantify fairness. Here, we investigate how one can divert the quantification of fairness by describing a practice we call "fairness hacking" for the purpose of shrouding unfairness in algorithms. This impacts end-users who rely on learning algorithms, as well as the broader community interested in fair AI practices. We introduce two different categories of fairness hacking in reference to the established concept of p-hacking. The first category, intra-metric fairness hacking, describes the misuse of a particular metric by adding or removing sensitive attributes from the analysis. In this context, countermeasures that have been developed to prevent or reduce p-hacking can be applied to similarly prevent or reduce fairness hacking. The second category of fairness hacking is inter-metric fairness hacking. Inter-metric fairness hacking is the search for a specific fair metric with given attributes. We argue that countermeasures to prevent or reduce inter-metric fairness hacking are still in their infancy. Finally, we demonstrate both types of fairness hacking using real datasets. Our paper intends to serve as a guidance for discussions within the fair ML community to prevent or reduce the misuse of fairness metrics, and thus reduce overall harm from ML applications.
Generalization of Jeffreys' divergence based priors for Bayesian hypothesis testing
Creators: name: Bayarri, M. J.
name: García-Donato, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: In this paper we introduce objective proper prior distributions for hypothesis testing and model selection based on measures of divergence between the competing models; we call them divergence based (DB) priors. DB priors have simple forms and desirable properties, like information (finite sample) consistency; often, they are similar to other existing proposals like the intrinsic priors; moreover, in normal linear models scenarios, they exactly reproduce Jeffreys-Zellner-Siow priors. Most importantly, in challenging scenarios such as irregular models and mixture models, the DB priors are well defined and very reasonable, while alternative proposals are not. We derive approximations to the DB priors as well as MCMC and asymptotic expressions for the associated Bayes factors.
Hamming distance as a measure of spatial chaos in evolutionary games
Creators: name: Alfaro, Gaspar
name: Sanjuán, Miguel A. F.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: From a context of evolutionary dynamics, social games can be studied as complex systems that may converge to a Nash equilibrium. Nonetheless, they can behave in an unpredictable manner when looking at the spatial patterns formed by the agents' strategies. This is known in the literature as spatial chaos. In this paper we analyze the problem for a deterministic prisoner's dilemma and a public goods game and calculate the Hamming distance that separates two solutions that start at very similar initial conditions for both cases. The rapid growth of this distance indicates the high sensitivity to initial conditions, which is a well-known indicator of chaotic dynamics.
description: 23 pages, 16 figures (13 uploaded images)
Boson-fermion mixtures inside an elongated cigar-shaped trap
Creators: name: Akdeniz, Z.
name: Vignolo, P.
name: Tosi, M. P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We present mean-field calculations of the equilibrium state in a gaseous mixture of bosonic and spin-polarized fermionic atoms with repulsive or attractive interspecies interactions, confined inside a cigar-shaped trap under conditions such that the radial thickness of the two atomic clouds is approaching the magnitude of the s-wave scattering lengths. In this regime the kinetic pressure of the fermionic component is dominant. Full demixing under repulsive boson-fermion interactions can occur only when the number of fermions in the trap is below a threshold, and collapse under attractive interactions is suppressed within the range of validity of the mean-field model. Specific numerical illustrations are given for values of system parameters obtaining in 7Li-6Li clouds.
description: 12 pages, 6 figures
On-farm Economics of Laser Landforming for Rice Farmers
Creators: name: Marshall, Graham R.
name: Jones, Randall E.
name: Marshall, Graham R.
name: Jones, Randall E.
Publisher: name: Unknown
Year: 1993
Subjects: Farm Management

description: The whole farm financial effects of laser land forming were analysed using a two stage modelling procedure. In the first stage, linear programming models of representative Murrumbidgee Irrigation Area (MIA) rice farms were used to predict the profit-maximising activity mixes with and without successive increments of land forming. In the second stage, the profit-maximising activity mixes with and without an increment became inputs into a spreadsheet model designed to undertake discounted cash flow analysis of investment in the increment. The transition over time of yields to the achievable levels for land formed layouts was accounted for in the spreadsheet model, as were the effects of taxation (including taxation concessions for land forming) and access to concessional credit from the Special Conservation Scheme of the New South Wales Rural Assistance Authority. The analysis suggests that land forming the full area of a typical MIA rice farm is warranted, but that priority in allocating a limited capital budget should be given to areas requiring relatively low volumes of earth to be moved. A financial analysis of 'topsoiling' (replacing topsoil on areas from which it has been 'heavy cut' during land forming) showed it to generate considerably lower rates of return than land forming. Thus it appears land forming should be given priority overtopsoiling in allocating a limited capital budget.
Persistence of Politicians and Firms’Innovation
Creators: name: Bellettini, Giorgio
name: Berti Ceroni, Carlotta
name: Prarolo, Giovanni
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2010
Subjects: SECS-P/01 Economia politica

description: We empirically investigate whether the persistence of politicians in political institutions affects the innovation activity of firms. We use 12,000 firm-level observations
from three waves of the Italian Observatory over Small and Medium Enterprises, and introduce a measure of political persistence defined as the average length of individual political careers in political institutions of Italian municipalities. Standard OLS
shows no raw correlation between political persistence and firms' innovation activity. However, once the causal effect is isolated by means of instrumental variables, using death of politicians as an exogenous source of variation of political persistence, we find a robust negative relation between political persistence and the probability of process
innovation. This finding is consistent with the view that political stability may hinder firms' incentive to innovate to maintain their competitiveness, as long as they can extract rents from long-term connections with politicians.
Automatic cable harness layout routing in a customizable 3D environment
Creators: name: Karlsson, T.
name: Åblad, E.
name: Hermansson, T.
name: Carlson, J. S.
name: Tenfält, G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences
subject: G.2.1; J.6
subject: 90C27

description: Designing cable harnesses can be time-consuming and complex due to many design and manufacturing aspects and rules. Automating the design process can help to fulfil these rules, speed up the process, and optimize the design. To accommodate this, we formulate a harness routing optimization problem to minimize cable lengths, maximize bundling by rewarding shared paths, and optimize the cables' spatial location with respect to case-specific information of the routing environment, e.g., zones to avoid. A deterministic and computationally effective cable harness routing algorithm has been developed to solve the routing problem and is used to generate a set of cable harness topology candidates and approximate the Pareto front. Our approach was tested against a stochastic and an exact solver and our routing algorithm generated objective function values better than the stochastic approach and close to the exact solver. Our algorithm was able to find solutions, some of them being proven to be near-optimal, for three industrial-sized 3D cases within reasonable time (in magnitude of seconds to minutes) and the computation times were comparable to those of the stochastic approach.
description: 14 pages, submitted for publication
Brachyta (Fasciobrachyta) petriccionei, a new Longhorn beetle species from Central Italy (Coleoptera: Cerambycidae)
Creators: name: Rapuzzi, Pierpaolo
name: Bologna, Marco A.
name: Poloni, Riccardo
Publisher: name: Fragmenta Entomologica
Year: 2019

description: In this paper we describe a new species of Cerambycidae of the Genus Brachyta, Subgenus Fasciobrachyta, close to Brachyta balcanica (Hampe, 1870). The new species, very likely associated as larvae with roots of Paeonia officinalis, was collected in the Majella National Park (Abruzzo, Italy) and its phylogenetic position clearly reveals a Transadriatic origin.
description: Fragmenta Entomologica, Vol. 51 No. 1 (2019)
What can we learn from hydrodynamic analysis at RHIC?
Creators: name: Hirano, Tetsufumi
Publisher: name: arXiv
Year: 2005
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We can establish a new picture, the perfect fluid sQGP core and the dissipative hadronic corona, of the space-time evolution of produced matter in relativistic heavy ion collisions at RHIC. It is also shown that the picture works well also in the forward rapidity region through an analysis based on a new class of the hydro-kinetic model and that this is a manifestation of rapid increase of entropy density in the vicinity of QCD critical temperature, namely deconfinement.
description: 8 pages, 4 figures, talk given at Workshop on Quark-Gluon-Plasma Thermalization, Vienna, Austria, 10-12 Aug 2005