cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Studies of the temperature and frequency dependent impedance of an electroceramic functional oxide thermistor
Creators: name: Schmidt, Rainer
name: Brinkman, Andrew W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The charge transport mechanism and the macroscopic dielectric constant in polycrystalline device materials commonly exhibit several components such as electrode-sample interface, grain boundary and bulk contributions. In order to gain precise understanding of the functionality of polycrystalline electroceramic device materials it is essential to deconvolute these contributions. The paradigm of functional thermistor ceramics based on thick film spinel manganates has been studied by temperature dependent alternating current impedance spectroscopy. Three typical relaxation phenomena were detected, which all showed a separated temperature dependence of resistivity consistent with thermally activated charge transport. The dominating grain boundary and the interface contributions exhibited distinctively different capacitance allowing clear identification. The composite nature of the dielectric properties in polycrystalline functional ceramics was emphasized, and impedance spectroscopy was shown to be a powerful tool to account for and model such behaviour.
Generation of large scale magnetic fields by coupling to curvature and dilaton field
Creators: name: Zavareh, A. Akhtari
name: Hojjati, A.
name: Mirza, B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate the generation of large scale magnetic fields in the universe from quantum fluctuations produced in the inflationary stage. By coupling these quantum fluctuations to the dilaton field and Ricci scalar, we show that the magnetic fields with the strength observed today can be produced. We consider two situations: First, the evolution of dilaton ends at the onset of the reheating stage. Second, the dilaton continues its evolution after reheating and then decays. In both cases, we come back to the usual Maxwell equations after inflation and then calculate present magnetic fields.
description: 22 pages
Arithmetic-Intensity-Guided Fault Tolerance for Neural Network Inference on GPUs
Creators: name: Kosaian, Jack
name: Rashmi, K. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Neural networks (NNs) are increasingly employed in safety-critical domains and in environments prone to unreliability (e.g., soft errors), such as on spacecraft. Therefore, it is critical to impart fault tolerance to NN inference. Algorithm-based fault tolerance (ABFT) is emerging as an efficient approach for fault tolerance in NNs. We propose an adaptive approach to ABFT for NN inference that exploits untapped opportunities in emerging deployment scenarios. GPUs have high compute-to-memory-bandwidth ratios, while NN layers have a wide range of arithmetic intensities. This leaves some layers compute bound and others memory-bandwidth bound, but current approaches to ABFT do not consider these differences. We first investigate ABFT schemes best suited for each of these scenarios. We then propose intensity-guided ABFT, an adaptive, arithmetic-intensity-guided approach that selects the most efficient ABFT scheme for each NN layer. Intensity-guided ABFT reduces execution-time overhead by 1.09--5.3$\times$ across many NNs compared to traditional approaches to ABFT.
description: Appeared in The International Conference for High Performance Computing, Networking, Storage and Analysis (SC '21), November 14--19, 2021, St. Louis, MO, USA
Jet hadrochemistry as a characteristics of jet quenching
Creators: name: Sapeta, Sebastian
name: Wiedemann, Urs Achim
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Jets produced in nucleus-nucleus collisions at the LHC are expected to be strongly modified due to the interaction of the parton shower with the dense QCD matter. Here, we point out that jet quenching can leave signatures not only in the longitudinal and transverse jet energy and multiplicity distributions, but also in the hadrochemical composition of the jet fragments. In particular, we show that even in the absence of medium effects at or after hadronization, the medium-modification of the parton shower can result in significant changes in jet hadrochemistry. We discuss how jet hadrochemistry can be studied within the high-multiplicity environment of nucleus-nucleus collisions at the LHC.
description: 15 pages, 7 figures, LaTex
Phonons as a platform for non-Abelian braiding and its manifestation in layered silicates
Creators: name: Peng, Bo
name: Bouhon, Adrien
name: Monserrat, Bartomeu
name: Slager, Robert-Jan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Topological phases of matter have revolutionised the fundamental understanding of band theory and hold great promise for next-generation technologies such as low-power electronics or quantum computers. Single-gap topologies have been extensively explored, and a large number of materials have been theoretically proposed and experimentally observed. These ideas have recently been extended to multi-gap topologies with band nodes that carry non-Abelian charges, characterised by invariants that arise by the momentum space braiding of such nodes. However, the constraints placed by the Fermi-Dirac distribution to electronic systems have so far prevented the experimental observation of multi-gap topologies in real materials. Here, we show that multi-gap topologies and the accompanying phase transitions driven by braiding processes can be readily observed in the bosonic phonon spectra of known monolayer silicates. The associated braiding process can be controlled by means of an electric field and epitaxial strain, and involves, for the first time, more than three bands. Finally, we propose that the band inversion processes at the $Γ$ point can be tracked by following the evolution of the Raman spectrum, providing a clear signature for the experimental verification of the band inversion accompanied by the braiding process.
description: 26 pages, 8 figures
Simulation-Based Inference of Reionization Parameters From 3D Tomographic 21 cm Lightcone Images
Creators: name: Zhao, Xiaosheng
name: Mao, Yi
name: Cheng, Cheng
name: Wandelt, Benjamin D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Tomographic three-dimensional 21 cm images from the epoch of reionization contain a wealth of information about the reionization of the intergalactic medium by astrophysical sources. Conventional power spectrum analysis cannot exploit the full information in the 21 cm data because the 21 cm signal is highly non-Gaussian due to reionization patchiness. We perform a Bayesian inference of the reionization parameters where the likelihood is implicitly defined through forward simulations using density estimation likelihood-free inference (DELFI). We adopt a trained 3D Convolutional Neural Network (CNN) to compress the 3D image data into informative summaries (DELFI-3D CNN). We show that this method recovers accurate posterior distributions for the reionization parameters. Our approach outperforms earlier analysis based on two-dimensional 21 cm images. In contrast, an MCMC analysis of the 3D lightcone-based 21 cm power spectrum alone and using a standard explicit likelihood approximation results in less accurate credible parameter regions than inferred by the DELFI-3D CNN, both in terms of the location and shape of the contours. Our proof-of-concept study implies that the DELFI-3D CNN can effectively exploit more information in the 3D 21 cm images than a 2D CNN or power spectrum analysis. This technique can be readily extended to include realistic effects and is therefore a promising approach for the scientific interpretation of future 21 cm observation data.
description: 23 pages, 19 figures, 4 tables. Accepted for publication in ApJ. Comments welcome
Dynamics of symmetric holomorphic maps on projective spaces
Creators: name: Ueno, Kohei
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37F15 (Primary), 37C80 (Secondary)

description: We consider complex dynamics of a critically finite holomorphic map from P^k to P^k, which has symmetries associated with the symmetric group S_{k+2} acting on P^k, for each k \ge 1. The Fatou set of each map of this family consists of attractive basins of superattracting points. Each map of this family satisfies Axiom A.
description: 12 pages
Revisiting dynamics of interacting quintessence
Creators: name: Pérez, Patrocinio
name: Nucamendi, Ulises
name: De Arcia, Roberto
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We apply the tools of the dynamical system theory in order to revisit and uncover the structure of a nongravitational interaction between pressureless dark matter and dark energy described by a scalar field $ϕ$. For a coupling function $Q = -(αdρ_m/dt + βdρ_ϕ/dt )$, where t is the cosmic time, we have found that it can be rewritten in the form $Q = 3H (αρ_m + β(dϕ/dt)^2 )/(1-α+β)$, so that its dependence on the dark matter density and on the kinetic term of the scalar field is linear and proportional to the Hubble parameter. We analyze the scenarios $α=0$, $α= β$ and $α= -β$, separately and in order to describe the cosmological evolution we have calculated various observables. A notable result of this work is that, unlike for the noninteracting scalar field with exponential potential where five critical points appear, in the case studied here, with the exception of the matter dominated solution, the remaining singular points are transformed into scaling solutions enriching the phase space. It is shown that for $α\neq 0$, a separatrix arises modifying prominently the structure of the phase space. This represents a novel feature no mentioned before in the literature.
description: 16 pages, 9 figures, 7 tables
A note on conformal connections on lightlike hypersurfaces
Creators: name: Atindogbe, Cyriaque
name: Bergery, Lionel Bérard
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C50, 53C05, 53C29

description: Degenerate submanifolds of pseudo-Riemannian manifolds are quite difficult to study because there is no prefered connection when the submanifold is not totally geodesic. For the particular case of degenerate totally umbilical hypersurfaces, we show that there are "Weyl" connections adapted to the induced structure on the hypersurface. We begin the study of these with their holonomy.
Forward Neutrino Fluxes at the LHC
Creators: name: Kling, Felix
name: Nevay, Laurence J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: With the upcoming Run 3 of the LHC, the FASERv and SND@LHC detectors will start a new era of neutrino physics using the far-forward high-energy neutrino beam produced in collisions at ATLAS. This emerging LHC neutrino physics program requires reliable estimates of the LHC's forward neutrino fluxes and their uncertainties. In this paper we provide a new fast-neutrino flux simulation, implemented as a RIVET module, to address this issue. We present the expected energy distributions going through the FASERv and SND@LHC detectors based on various commonly used event generators, analyze the origin of those neutrinos, and present the expected neutrino event rates.
description: updated version as submitted in PRD
Overcoming the Distance Estimation Bottleneck in Estimating Animal Abundance with Camera Traps
Creators: name: Haucke, Timm
name: Kühl, Hjalmar S.
name: Hoyer, Jacqueline
name: Steinhage, Volker
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences
subject: I.4.9; I.5.4

description: The biodiversity crisis is still accelerating, despite increasing efforts by the international community. Estimating animal abundance is of critical importance to assess, for example, the consequences of land-use change and invasive species on community composition, or the effectiveness of conservation interventions. Various approaches have been developed to estimate abundance of unmarked animal populations. Whereas these approaches differ in methodological details, they all require the estimation of the effective area surveyed in front of a camera trap. Until now camera-to-animal distance measurements are derived by laborious, manual and subjective estimation methods. To overcome this distance estimation bottleneck, this study proposes an automatized pipeline utilizing monocular depth estimation and depth image calibration methods. We are able to reduce the manual effort required by a factor greater than 21 and provide our system at https://timm.haucke.xyz/publications/distance-estimation-animal-abundance
Hamiltonian Formulation of Higher Rank Symmetric Gauge Theories
Creators: name: Banerjee, Rabin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Recent discussions of higher rank symmetric (fractonic) gauge theories have revealed the important role of Gauss constraints. This has prompted the present study where a detailed hamiltonian analysis of such theories is presented. Besides a general treatment, the traceless scalar charge theory is considered in details. A new form for the action is given which, in 2+1 dimensions, yields area preserving diffeomorphisms. Investigation of global symmetries reveals that this diffeomorphism invariance induces a noncommuting charge algebra that gets exactly mapped to the algebra of coordinates in the lowest Landau level problem. Connections of this charge algebra to noncommutative fluid dynamics and magnetohydrodynamics are shown.
description: 20 pages, no figures; V2 (21 pages) has some changes that highlight the novelty of the present work. Version to appear in EPJC
Memory retrieval dynamics and storage capacity of a modular network model of association cortex with featural decomposition
Creators: name: Mari, Carlo Fulvi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The primate heteromodal cortex presents an evident functional modularity at a mesoscopic level, with physiological and anatomical evidence pointing to it as likely substrate of long-term memory. In order to investigate some of its properties, a model of multimodular autoassociator is studied. Each of the many modules represents a neocortical functional ensemble of recurrently connected neurons and operates as a Hebbian autoassociator, storing a number of local features which it can recall upon cue. The global memory patterns are made of combinations of features sparsely distributed across the modules. Intermodular connections are modelled as a finite-connectivity random graph. Any pair of features in any respective pair of modules is allowed to be involved in several memory patterns; the coarse-grained modular network dynamics is defined in such a way as to overcome the consequent ambiguity of associations. Effects of long-range homeostatic synaptic scaling on network performance are also assessed. The dynamical process of cued retrieval almost saturates a natural upper bound while producing negligible spurious activation. The extent of finite-size effects on storage capacity is quantitatively evaluated. In the limit of infinite size, the functional relationship between storage capacity and number of features per module reduces to that which other authors found by methods from equilibrium statistical mechanics, which suggests that the origin of the functional form is of a combinatorial nature. In contrast with its apparent inevitability at intramodular level, long-range synaptic scaling results to be of minor relevance to both retrieval and storage capacity, casting doubt on its existence in the neocortex. A conjecture is also posited about how statistical fluctuation of connectivity across the network may underpin spontaneous emergence of semantic hierarchies through learning.
description: v2: 17 pages, 7+2 figures, pdflatex. Minor Revision: Further observations and references were included, the wording of some paragraphs was improved, and several typos were corrected
Generating mapping class groups of nonorientable surfaces with boundary
Creators: name: Stukow, Michal
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57N05, 20F38, 57M99

description: We obtain simple generating sets for various mapping class groups of a nonorientable surface with punctures and/or boundary. We also compute the abelianizations of these mapping class groups.
Musca minima Rondani 1868
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Anthomyiidae
Musca
Musca minima

description: Musca minima Rondani, 1868
ORIGINAL DESCRIPTION: 1868a: 52.
TYPE LOCALITY: “ in colle ditionis parmensis [Parmese hill (Italy)]”.
TYPE MATERIAL: not found in this study.
CURRENT STATUS: junior primary homonym of Musca minima Harris, 1780; junior synonym of Musca tempestiva Fallén, 1817 (Pont 1986b: 93, Thompson & Pont 1994: 97, Gorodkov et al. 1995: 11).
REMARKS: Rondani (1868a: 52) described Musca minima from just the female sex, without specifying either the number or the length of the specimens: “ Foem. … Semel lecta [Female … Once collected]”. We could not locate any type specimens of this nominal species during our study.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 152, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
The Epistemic Insight Explorer
Creators: name: Billingsley, Berry
name: Simpson, Sherralyn
Publisher: name: Zenodo
Year: 2022
Subjects: Epistemic Insight
Primary Education
Multidisciplinary
Practical science
Primary science
Cross-curricular learning

description: The Epistemic Insight Explorer tells the story of a LASAR researcher who has worked in partnership with Primary schools during the pandemic. It highlights Epistemic Insight pedagogy, noting the collaborative action-research with teachers, who have engaged with practical science enquiry workshop activities in their classroom. For example 'Why did the Titanic sink?' is explored through two disciplinary lenses that of science and history.
Sensitivity Analysis of Discrepancy Terms introduced in Turbulence Models using Field Inversion
Creators: name: Jäckel, Florian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: RANS simulations with the Spalart-Allmaras turbulence model are improved for cases with flow separation using the Field Inversion and Machine Learning approach. A compensatory discrepancy term is introduced into the turbulence model and optimized using high-fidelity reference data from experiments. Influences on the optimization results with respect to regularization, grid resolution and areas in which the optimization is active are investigated. Finally, a neural network is trained and used to augment simulations on a test case.
Improving the catalytic performance of Ni(Ru)/MgO in the conversion of ethanol to butanol by dispersion on gamma-Al2O3 pellets
Creators: name: Apuzzo
name: Cimino
name: , Lisi
Publisher: name: Zenodo
Year: 2018
Subjects: ethanol
butanol
catalyst
pellet

description: Nickel or ruthenium have been dispersed on commercial -Al2O3 pellets promoted with magnesium oxide for use as catalysts in the upgrade of bio-ethanol into butanol as possible higher alcohol additive into gasoline. Interactions between MgO and Al2O3 as well as between the active metal and the composite Mg/Al substrate have been investigated by XRD, SEM/EDX, N2 physisorption, H2-TPR, CO2-TPD. The conversion of ethanol into butanol has been investigated at 350-400°C under diluted ethanol feed conditions in order to define properties promoting high butanol yields
Two-stage Kondo effect in side-coupled quantum dots: Renormalized perturbative scaling theory and Numerical Renormalization Group analysis
Creators: name: Chung, Chung-Hou
name: Zarand, Gergely
name: Wölfle, Peter
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study numerically and analytically the dynamical (AC) conductance through a two-dot system, where only one of the dots is coupled to the leads but it is also side-coupled to the other dot through an antiferromagnetic exchange (RKKY) interaction. In this case the RKKY interaction gives rise to a ``two-stage Kondo effect'' where the two spins are screened by two consecutive Kondo effects. We formulate a renormalized scaling theory that captures remarkably well the cross-over from the strongly conductive correlated regime to the low temperature low conductance state. Our analytical formulas agree well with our numerical renormalization group results. The frequency dependent current noise spectrum is also discussed.
description: 6 pages, 7 figures
Musca scapularis Rondani 1875
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Anthomyiidae
Musca
Musca scapularis

description: Musca scapularis Rondani, 1875
ORIGINAL DESCRIPTION: 1875c: 428.
TYPE LOCALITY: “ Insula Bonae Fortunae (Borneo), Provincia Sarawak [Bona Fortuna Island, Sarawak Province, Borneo]” (Rondani 1875c: 421).
TYPE MATERIAL: 1 ♂, holotype (MSNG): Sarawak / Typus / scapularis Rond. / Musca scapularis n° 18.
CURRENT STATUS: junior synonym of Musca conducens Walker, 1859 (Pont 1977: 456, Thompson & Pont 1994: 118).
REMARKS: Rondani (1875c: 428) described Musca scapularis from just the male sex, without specifying the exact number of specimens and not giving a range of lengths, from material collected by G. Doria and O. Beccari. Guiglia (1957: 195) and Raineri & Rey (1996: 43) reported the holotype (♂) in the MSNG.
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 152, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Decay channels and charmonium mass-shifts
Creators: name: Pennington, M. R.
name: Wilson, D. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The discovery in the last few years of the $X, Y$ and $Z$ states of the extended charmonium family has highlighted the importance of the closeness of decay channels to an understanding of these mesons. We aid this debate by illustrating a simple calculational procedure for including the effect of open and nearby closed channels.
description: 4 pages, 2 figures Revised version: (1) corrected 2 typos in Table II, (2) additional text in penultimate paragraph to clarify the calculation of mass-shifts for $\eta_c'$ and $\eta_c"$. We thank colleagues for pointing out confusing wording of previous text
Design and analysis of a CNC system for machining and monitoring
Creators: name: Peng, Jie
Publisher: name: University of British Columbia
Year: 2010

description: The development of unmanned machining systems has been a recent focus of manufacturing research. Computer Numerical Control (CNC) units, which monitor and control many tightly coupled machining tasks, are inseparable parts of the unmanned manufacturing system. This thesis addresses the detailed design and analysis of a modular CNC system for a milling machine. The feed drive control system of the machine tool is thoroughly studied. The mathematical model for the feed drive control system, which consists of a motion controller, power amplifiers and DC-servo motors, is developed and experimentally verified. A method of estimating cutting forces from current drawn by feed drive motors is developed. The viability of the current sensor as a feeding-force sensing component is illustrated and experimentally tested on the milling machine. Successful application of the current sensor to tool breakage detection in milling operation is presented. The performance of the multi-axis contouring system in precision machining is discussed. The contouring errors induced by feed drive positioning systems in CNC machine tools is investigated using the state space model of the CNC system. The influence of the cutting force on the accuracy of machining is shown to be negligible for feed drives driven by ball leadscrews. Various control strategies for the improvement of machining accuracy are tested in the simulation studies.
Laboratory Tests Frequently Used In Bovine Practice at Carnation Research Farm
Creators: name: Studer, Erich
Publisher: name: American Association of Bovine Practitioners  Proceedings of the Annual Conference
Year: 1981

description: Diagnosis is what makes the practice of veterinary medicine a challenging and rewarding experience. It has to include history as well as a clinical workup utilizing laboratory procedures, radiology, biopsy, exploratory surgery and necropsy. At Carnation Research Farm we use whatever tests and laboratory facilities needed to help us arrive at a definitive diagnosis. Outside reputable commercial and state labs as well as University facilities are employed. There are a number of procedures however routinely carried out in our own facilities. They are quick manual tests which can be performed in a few minutes to help us in diagnosis during a clinical workup or treatment.
description: American Association of Bovine Practitioners Proceedings of the Annual Conference, 1981
A comparison theorem for simplicial resolutions
Creators: name: Goedecke, Julia
name: Van der Linden, Tim
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Topology (math.AT)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 18G

description: It is well known that Barr and Beck's definition of comonadic homology makes sense also with a functor of coefficients taking values in a semi-abelian category instead of an abelian one. The question arises whether such a homology theory has the same convenient properties as in the abelian case. Here we focus on independence of the chosen comonad: conditions for homology to depend on the induced class of projectives only.
description: 16 pages
Recensione Libro - Josefino António Sawandji João - Globalizzazione e conflitti Un itinerario geopolitico sull'Africa subsahariana
Creators: name: Barbara, Caliandro
Publisher: name: Zenodo
Year: 2020

description: Recensione Libro - Josefino António Sawandji João - Globalizzazione e conflitti Un itinerario geopolitico sull'Africa subsahariana
Ru-BASED CATALYSTS FOR CONVERSION OF ETHANOL TO BUTANOL: EFFECT OF ACID-BASE AND REDOX PROPERTIES
Creators: name: Cimino
name: , Lisi
name: Romanucci
Publisher: name: Zenodo
Year: 2017
Subjects: ethanol
butanol
catalyst
surface acidity

description: Ethanol is currently the biggest liquid biofuel contributor worldwide, although problems associated with its use as fuel in internal combustion engines still remain related to water solubility and corrosivity. Ethanol can be valorised to higher alcohols, e.g., 1-butanol via catalytic route. Indeed, 1-butanol can be burned in the existing gasoline engines without practically any engine or car modifications, it has higher energy content and air-to-fuel ratio than ethanol and can be distributed via the existing pipelines for gasoline.

Synthesis of higher alcohol from lower alcohol is generally known as the Guerbet reaction [1-3]. The mechanism of n-butanol synthesis from ethanol is considered to be an indirect process in which ethanol is converted to n-butanol via acetaldehyde [4]. A suitable combination of both acid and basic sites is considered a key-feature for an effective catalyst. Furthermore, addition of an active metal capable to provide hydrogenation/dehydrogenation properties might promote the initial dehydrogenation of the alcohol to form the carbonyl intermediate of the Guerbet coupling.

In this work we set out to investigate the effect of acid-base properties of several supports such as hydroxyapatite, MgO, -Al2O3 and La-promoted gamma-Al2O3 on butanol production from ethanol. The effect of dispersion of small (≤1%) amounts of ruthenium from nitrosyl nitrate precursor was also studied and acid-base properties of the supports and redox properties of the noble metal were correlated to the catalytic performance.

Catalytic tests were carried out in the temperature range 200-500°C by feeding an ethanol/N2 mixture to a lab-scale fixed bed reactor of powdered catalyst. Reactants and products were analysed by an online GC equipped with FI detector. Both supports and Ru-based catalysts were deeply characterized by XRD, N2 physisorption, H2 chemisorption, TGA, CO2 and NH3 TPD, H2 TPR.

Highest butanol yields were associated to low ratio between acid and basic centres and to the easy reducibility of well dispersed ruthenium on high surface area supports.

The work has been done in the framework of the research project Waste2Fuels ‘Sustainable production of next generation biofuels from waste streams’ (N. 654623) funded under the European Union’s research and innovation program Horizon 2020
Constrained simulations of the local universe: I. Mass and motion in the Local Volume
Creators: name: Martinez-Vaquero, Luis A.
name: Yepes, Gustavo
name: Hoffman, Yehuda
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It has been recently claimed that there is no correlation between the distribution of galaxies and their peculiar velocities within the Local Volume (LV), namely a sphere of R=7/h Mpc around the Local Group (LG). It has been then stated that this implies that either locally dark matter is not distributed in the same way as luminous matter, or peculiar velocities are not due to fluctuations in mass. To test that statement a set of constrained N-body cosmological simulations, designed to reproduce the main observed large scale structure, have been analyzed. The simulations were performed within the flat-Lambda, open and flat matter only CDM cosmogonies. Two unconstrained simulations of the flat-Lambda and open CDM models were performed for comparison. LG-like objects have been selected so as to mimic the real LG environment. The local gravitational field due to all halos found within each LV is compared with the exact gravitational field induced by all matter in the simulation. We conclude that there is no correlation between the exact and the local gravitational field obtained by pairwise newtonian forces between halos. Moreover, the local gravitational field is uncorrelated with the peculiar velocities of halos. The exact gravitational field has a linear correlation with peculiar velocities but the proportionality constant relating the velocity with gravitational field falls below the prediction of the linear theory. Upon considering all matter inside the LVs, the exact and local gravitational accelerations show a much better correlation, but with a considerable scatter independent on the cosmological models. The main conclusion is that the lack of correlation between the local gravitation and the peculiar velocity fields around LG-like objects is naturally expected in the CDM cosmologies.
description: 10 pages, 19 figures. Accepted for publication in MNRAS
Coulomb tunneling for fusion reactions in dense matter: Path integral Monte Carlo versus mean field
Creators: name: Chugunov, A. I.
name: DeWitt, H. E.
name: Yakovlev, D. G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We compare Path Integral Monte Carlo calculations by Militzer and Pollock (Phys. Rev. B 71, 134303, 2005) of Coulomb tunneling in nuclear reactions in dense matter to semiclassical calculations assuming WKB Coulomb barrier penetration through the radial mean-field potential. We find a very good agreement of two approaches at temperatures higher than ~1/5 of the ion plasma temperature. We obtain a simple parameterization of the mean field potential and of the respective reaction rates. We analyze Gamow-peak energies of reacting ions in various reaction regimes and discuss theoretical uncertainties of nuclear reaction rates taking carbon burning in dense stellar matter as an example.
description: 13 pages, 7 figures, to appear in Phys. Rev. D
Doping and energy evolution of spin dynamics in the electron-doped cuprate superconductor Pr$_{0.88}$LaCe$_{0.12}$CuO$_{4-δ}$
Creators: name: Cheng, Li
name: Feng, Shiping
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The doping and energy evolution of the magnetic excitations of the electron-doped cuprate superconductor Pr$_{0.88}$LaCe$_{0.12}$CuO$_{4-δ}$ in the superconducting state is studied based on the kinetic energy driven superconducting mechanism. It is shown that there is a broad commensurate scattering peak at low energy, then the resonance energy is located among this low energy commensurate scattering range. This low energy commensurate scattering disperses outward into a continuous ring-like incommensurate scattering at high energy. The theory also predicts a dome shaped doping dependent resonance energy.
description: 8 pages, 4 figures, added discussions, replotted figures, and updated references, accepted for publication in Phys. Rev. B
MOESM1 of Application of delayed luminescence measurements for the identification of herbal materials: a step toward rapid quality control
Creators: name: Sun, Mengmeng
name: Wang, Shengpeng
name: Jing, Yong
name: Li, Li
name: He, Min
name: Jia, Yusheng
name: Wijk, Eduard
name: Wang, Yitao
name: Wang, Zhihong
name: Wang, Mei
Publisher: name: figshare
Year: 2019
Subjects: subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Developmental Biology
subject: Marine Biology
subject: Cancer

description: Additional file 1: Table S1. The DL properties and altitudes of rhubarb samples.
L^2-Betti numbers of plane algebraic curves
Creators: name: Friedl, Stefan
name: Leidy, Constance
name: Maxim, Laurentiu
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geometric Topology (math.GT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 32S20, 32S55

description: In [DJL07] it was shown that if A is an affine hyperplane arrangement in C^n, then at most one of the L^2-Betti numbers of its complement is non--zero. We will prove an analogous statement for complements of any algebraic curve in C^2. Furthermore we also recast and extend results of [LM06] in terms of L^2-Betti numbers.
description: Final version. To be published by the Michigan Mathematical Journal. 12 pages
Hebotomus minutus Rondani 1843
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Psychodidae
Hebotomus
Hebotomus minutus

description: Hebotomus minutus Rondani, 1843
ORIGINAL DESCRIPTION: 1843f: 265.
TYPE LOCALITY: “ in planitia parmensi prope Padana [Parmese plains near the Padana (Italy)]”.
TYPE MATERIAL: 4 ♂♂, syntypes (each glued to a cardboard) (MZUF: Box 57): Phlebotomus Rndn. / minutus Rndn., ♂, Parma / 3036 / Phlebotomus minutus Rndn., ♂, rev. e det. G. Saccà; 1 ♂, syntype (glued to a cardboard) (MZUF: Box 57): Phlebotomus Rndn. / minutus Rndn., ♂, Parma / 3036 / Phlebotomus Rndn. papatasi Scop., ♂, rev. e det. G. Saccà; 1 ♂, syntype (very damaged, only part of thorax and wings remain) (MZUF: Box 57): Phlebotomus Rndn. / minutus Rndn., ♂, Parma / 3036 / Phlebotomus Rndn. papatasi Scop., ♂, G. Saccà det.; 1 ♀, syntype (glued to a cardboard), (MZUF: Box 57): Phlebotomus Rndn. / minutus Rndn., ♀, Parma / 3036 / Phlebotomus minutus Rndn., ♀, rev. e det. G. Saccà; 2 specimens, syntypes (sex not determinable, one missing its abdomen, the other its head, abdomen and legs) (MZUF: Box 57): Phlebotomus Rndn. / minutus Rndn., Parma / 3036; 2 specimens, syntypes (sex not determinable, glued to a cardboard stage, both missing head and abdomen) (MZUF: Box 57): Phlebotomus Rndn. / minutus Rndn., Parma / 3036 / Phlebotomus sp. gruppo major, rev. e det. Saccà; 1 specimen, syntype (sex not determinable, double-mounted: fastened by a micro pin to a polyethylene foam block on a standard insect pin) (OUMNH Verrall-Collin Palaearctic Residues: Box 148.9): syntype / Type / Phlebotomus minutus Rondani Type, Parma / P. minutus Ex. Coll. Bigot; 4 specimens, syntypes (sex not determinable, double-mounted: fastened by a micro pin to a polyethylene foam block on a standard insect pin) (OUMNH Verrall-Collin Palaearctic Residues: Box 148.9): syntype / Type / P. minutus Ex. Coll. Bigot.
CURRENT STATUS: valid species, as Sergentomyia minuta (Wagner 1990: 22, Dahl et al. 1995: 32).
REMARKS: Rondani (1843f: 265) described Hebotomus minutus without specifying either the number or the sex of the specimens, but giving a single measurement of length. He certainly had the male sex because he included a drawing of the male terminalia (Rondani 1843f: pl. 10). In the MZUF the labels with the species names have been removed from their specimens, pinned together and arranged near the specimens in the Box. We found 16 syntypes in this study. Saccà (1947: 54), in studying the type material, listed ten rather than the 11 specimens present in the MZUF, did not mention the five OUMNH specimens, and did not designate a lectotype. Rondani described the genus as “ Hebotomus ”, which is an “incorrect subsequent spelling of Phlebotomus Rondani & Berté, 1840 ” (O’Hara et al. 2011: 94).
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on page 181, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Simple Coherent Polarization Manipulation Scheme for Generating High Power Radially Polarized Beam
Creators: name: Phua, P. B.
name: Lai, W. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a simple novel scheme that converts a Gaussian beam into an approximated radially polarized beam using coherent polarization manipulation together with Poynting walk-off in birefringent crystals. Our scheme alleviates the interferometric stability required by previous schemes that implemented this coherent mode summation using Mach-Zehnder-like interferometers. A symmetrical arrangement of two walk-off crystals with a half-wave plate, allows coherence control even when the laser has short temporal coherence length. We generated 14 watts of radially polarized beam from an Ytterbium fiber laser, only limited by the available fiber laser power.
description: Submitting for publication
Sarcophaga puerula Rondani 1861
Creators: name: Sforzi, Alessandra
name: Sommaggio, Daniele
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Sarcophagidae
Sarcophaga
Sarcophaga puerula

description: Sarcophaga puerula Rondani, 1861
ORIGINAL DESCRIPTION: 1861g: 382 (key), 389 (description).
TYPE LOCALITY: “ In Italia media et boreali [central and boreal (= northern) Italy]”.
TYPE MATERIAL: 1 ♂, lectotype (missing left mid-leg) (MZUF: Box 19): Sarcophaga Mgn / puerula Rnd. ♂ / 1028 / = setinervis ♂ Rond. det. Böttcher / lectotype ♂, Sarcophaga puerula Rnd., T. Pape det., 1986 / Heteronychia setinervis (Rnd.), T. Pape det., 1986.
PARALECTOTYPES EXAMINED: 1 ♂ (terminalia in a microvial, head glued to a cardboard stage, both items pinned below specimen) (MZUF: Box 19): Sarcophaga Mgn / puerula Rnd. ♂ / 1028 / Sarcophaga sp.? ♂ det. Böttcher / paralectotype; 1 ♂, 1 ♀ (couple pinned together) (MZUF: Box 19): Sarcophaga Mgn / puerula Rnd. ♂ / 1028 / = anxilla ♂ ♀ Pand. det. Böttcher / paralectotype; 1 ♂ (terminalia and abdomen glued to a cardboard stage pinned below specimen) (MZUF: Box 19): Sarcophaga Mgn / puerula Rnd. ♂ / 1028 / = setinervis ♂ Rond. det. Böttcher / paralectotype; 4 ♀♀ (MZUF: Box 19): Sarcophaga Mgn / puerula Rnd. ♀ / 1028 / paralectotype.
PARALECTOTYPES NOT EXAMINED: 1 ♂, 1 ♀ (MZUF: Box F): Sarcophaga puerula Rd., 373, ♂ ♀, Parma / 393 373; 1 ♂ (missing left hind-leg) (MSNC: Box DIPTERA Ex collezione Rondani - I): Sarcophaga puerula Rnd. 398 ♂ ♀ Parma / Coll. Rondani, scatola n° 5, posiz. C-7 / Museo di Storia Naturale Università di Pisa, Calci (PI) ex collezione Rondani; 1 ♀ (missing head, both mid- and right hind-legs) (MSNC: Box DIPTERA Ex collezione Rondani - I): Sarcophaga puerula Rnd. ♀ Parm. / Coll. Rondani, scatola n° 5, posiz. C-8 / Museo di Storia Naturale Università di Pisa, Calci (PI) ex collezione Rondani; 1 ♂, 1 ♀ (MSNPV: Box 95): Sarcophaga puerula Rnd., 495, ♂ ♀, Parma.
CURRENT STATUS: junior synonym of Sarcophaga (Heteronychia) setinervis Rondani, 1860 (Verves 1986: 148, Pape 1988: 14, 1996: 333).
REMARKS: Rondani (1861g: 389) described both sexes of Sarcophaga puerula without specifying the exact number of specimens and giving a range of lengths, but from more than one specimen because he indicated “ frequens [common]” and listed two type localities. He named the species “ puerula ” (p. 382) in his key but “ parvula ” in his description (p. 389). Acting as First Reviser (according to I.C.Z.N. 1999: Article 24.2.4), Rondani (1862d: 119) determined “ puerula ” as the correct original spelling. In his redescription, Rondani (1862d: 119) specified the type locality: “ in collibus agri parmensis [Parmese hills]”. Pape (1988: 14) designated a lectotype (♂) and paralectotypes (3 ♂♂, 5 ♀♀) but did not mention an additional six specimens: two in the MZUF, two in the MSNC, and two in the MSNPV (all are paralectotypes).
description: Published as part of Sforzi, Alessandra & Sommaggio, Daniele, 2021, Catalog of the Diptera types described by Camillo Rondani, pp. 1-438 in Zootaxa 4989 (1) on pages 205-206, DOI: 10.11646/zootaxa.4989.1.1, http://zenodo.org/record/4980621
Gravitational Wave Signals from Two-Dimensional Core-Collapse Supernova Models with Rotation and Magnetic Fields
Creators: name: Jardine, Rylan
name: Powell, Jade
name: Müller, Bernhard
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the impact of rotation and magnetic fields on the dynamics and gravitational wave emission in 2D core-collapse supernova simulations with neutrino transport. We simulate 17 different models of $15\,M_\odot$ and $39\,M_\odot$ progenitor stars with various initial rotation profiles and initial magnetic fields strengths up to $10^{12}\, \mathrm{G}$, assuming a dipolar field geometry in the progenitor. Strong magnetic fields generally prove conducive to shock revival, though this trend is not without exceptions. The impact of rotation on the post-bounce dynamics is more variegated, in line with previous studies. A significant impact on the time-frequency structure of the gravitational wave signal is found only for rapid rotation or strong initial fields. For rapid rotation, the angular momentum gradient at the proto-neutron star surface can appreciably affect the frequency of the dominant mode, so that known analytic relations for the high-frequency emission band no longer hold. In case of two magnetorotational explosion models, the deviation from these analytic relations is even more pronounced. One of the magnetorotational explosions has been evolved to more than half a second after the onset of the explosion and shows a subsidence of high-frequency emission at late times. Its most conspicuous gravitational wave signature is a high-amplitude tail signal. We also estimate the maximum detection distances for our waveforms. The magnetorotational models do not stick out for higher detectability during the post-bounce and explosion phase.
description: 19 pages, 12 figures, substantially revised version. Model m15afb12 has been recalculated to remove numerical contamination of high-frequency tail of GW spectrum. One new model m15nrb11 and additional analysis added. Accepted for publiation in MNRAS
Tightening the Biological Constraints on Gradient-Based Predictive Coding
Creators: name: Alonso, Nick
name: Neftci, Emre
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Predictive coding (PC) is a general theory of cortical function. The local, gradient-based learning rules found in one kind of PC model have recently been shown to closely approximate backpropagation. This finding suggests that this gradient-based PC model may be useful for understanding how the brain solves the credit assignment problem. The model may also be useful for developing local learning algorithms that are compatible with neuromorphic hardware. In this paper, we modify this PC model so that it better fits biological constraints, including the constraints that neurons can only have positive firing rates and the constraint that synapses only flow in one direction. We also compute the gradient-based weight and activity updates given the modified activity values. We show that, under certain conditions, these modified PC networks perform as well or nearly as well on MNIST data as the unmodified PC model and networks trained with backpropagation.
description: This is a preprint of a published article. For final, published version see https://doi.org/10.1145/3477145.3477148