cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Diversity-Multiplexing Tradeoff via Asymptotic Analysis of Large MIMO Systems
Creators: name: Loyka, Sergey
name: Levin, George
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Diversity-multiplexing tradeoff (DMT) presents a compact framework to compare various MIMO systems and channels in terms of the two main advantages they provide (i.e. high data rate and/or low error rate). This tradeoff was characterized asymptotically (SNR-> infinity) for i.i.d. Rayleigh fading channel by Zheng and Tse [1]. The asymptotic DMT overestimates the finite-SNR one [2]. In this paper, using the recent results on the asymptotic (in the number of antennas) outage capacity distribution, we derive and analyze the finite-SNR DMT for a broad class of channels (not necessarily Rayleigh fading). Based on this, we give the convergence conditions for the asymptotic DMT to be approached by the finite-SNR one. The multiplexing gain definition is shown to affect critically the convergence point: when the multiplexing gain is defined via the mean (ergodic) capacity, the convergence takes place at realistic SNR values. Furthermore, in this case the diversity gain can also be used to estimate the outage probability with reasonable accuracy. The multiplexing gain definition via the high-SNR asymptote of the mean capacity (as in [1]) results in very slow convergence for moderate to large systems (as 1/ln(SNR)^2) and, hence, the asymptotic DMT cannot be used at realistic SNR values. For this definition, the high-SNR threshold increases exponentially in the number of antennas and in the multiplexing gain. For correlated keyhole channel, the diversity gain is shown to decrease with correlation and power imbalance of the channel. While the SNR-asymptotic DMT of Zheng and Tse does not capture this effect, the size-asymptotic DMT does.
description: To appear in 2007 IEEE International Symposium on Information Theory (ISIT 2007), Nice, June 2007
Phase controlled superconducting proximity effect probed by tunneling spectroscopy
Creators: name: Sueur, H. Le
name: Joyez, P.
name: Pothier, H.
name: Urbina, C.
name: Esteve, D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Using a dual-mode STM-AFM microscope operating below 50mK we measured the Local Density of States (LDoS) along small normal wires connected at both ends to superconductors with different phases. We observe that a uniform minigap can develop in the whole normal wire and in the superconductors near the interfaces. The minigap depends periodically on the phase difference. The quasiclassical theory of superconductivity applied to a simplified 1D model geometry accounts well for the data.
description: Accepted for publication in Physical Review Letters
Structure and dynamics of the inner nebula around the symbiotic stellar system R Aqr
Creators: name: Bujarrabal, V.
name: Agundez, M.
name: Gomez-Garrido, M.
name: Kim, Hyosun
name: Santander-Garcia, M.
name: Alcolea, J.
name: Castro-Carrizo, A.
name: Mikolajewska, J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We investigate the structure, dynamics, and chemistry of the molecule-rich nebula around the stellar symbiotic system R Aqr, which is significantly affected by the presence of a white dwarf (WD) companion. We study the effects of the strong dynamical interaction between the AGB wind and the WD and of photodissociation by the WD UV radiation on the circumstellar shells. We obtained high-quality ALMA maps of the 12CO J=2-1, J=3-2, and J=6-5 lines and of 13CO J=3-2. The maps were analyzed by means of a heuristic 3D model that is able to reproduce the observations. In order to interpret this description of the molecule-rich nebula, we performed sophisticated calculations of hydrodynamical interaction and photoinduced chemistry. We find that the CO-emitting gas is distributed within a relatively small region
description: 17 pages. Accepted for Astronomy & Astrophysics
Efficiency of energy transfer in a light-harvesting system under quantum coherence
Creators: name: Olaya-Castro, Alexandra
name: Lee, Chiu Fan
name: Olsen, Francesca Fassioli
name: Johnson, Neil F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the role of quantum coherence in the efficiency of excitation transfer in a ring-hub arrangement of interacting two-level systems, mimicking a light-harvesting antenna connected to a reaction center as it is found in natural photosynthetic systems. By using a quantum jump approach, we demonstrate that in the presence of quantum coherent energy transfer and energetic disorder, the efficiency of excitation transfer from the antenna to the reaction center depends intimately on the quantum superposition properties of the initial state. In particular, we find that efficiency is sensitive to symmetric and asymmetric superposition of states in the basis of localized excitations, indicating that initial state properties can be used as a efficiency control parameter at low temperatures.
description: Extended version of original paper. 7 pages, 2 figures
Exploring Lifetime Effects in Femtoscopy
Creators: name: Brown, D. A.
name: Soltz, R.
name: Newby, J.
name: Kisiel, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the role of lifetime effects from resonances and emission duration tails in femtoscopy at RHIC in two Blast-Wave models. We find the non-Gaussian components compare well with published source imaged data, but the value of R_out obtained from Gaussian fits is not insensitive to the non-Gaussian contributions when realistic acceptance cuts are applied to models.
description: 5 pages, 2 figures
A survey of active learning algorithms for supervised remote sensing image classification
Creators: name: Tuia, Devis
name: Volpi, Michele
name: Copa, Loris
name: Kanevski, Mikhail
name: Munoz-Mari, Jordi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Defining an efficient training set is one of the most delicate phases for the success of remote sensing image classification routines. The complexity of the problem, the limited temporal and financial resources, as well as the high intraclass variance can make an algorithm fail if it is trained with a suboptimal dataset. Active learning aims at building efficient training sets by iteratively improving the model performance through sampling. A user-defined heuristic ranks the unlabeled pixels according to a function of the uncertainty of their class membership and then the user is asked to provide labels for the most uncertain pixels. This paper reviews and tests the main families of active learning algorithms: committee, large margin and posterior probability-based. For each of them, the most recent advances in the remote sensing community are discussed and some heuristics are detailed and tested. Several challenging remote sensing scenarios are considered, including very high spatial resolution and hyperspectral image classification. Finally, guidelines for choosing the good architecture are provided for new and/or unexperienced user.
Variation on a Zernike wavefront sensor theme: optimal use of photons
Creators: name: Chambouleyron, Vincent
name: Fauvarque, Olivier
name: Sauvage, Jean-François
name: Dohlen, Kjetil
name: Levraud, Nicolas
name: Vigan, Arthur
name: N'Diaye, Mamadou
name: Neichel, Benoît
name: Fusco, Thierry
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The Zernike wavefront sensor (ZWFS) is a concept belonging to the wide class Fourier-filtering wavefront sensor (FFWFS). The ZWFS is known for its extremely high sensitivity while having a low dynamic range, which makes it a unique sensor for second stage adaptive optics (AO) systems or quasi-static aberrations calibration sensor. This sensor is composed of a focal plane mask made of a phase shifting dot fully described by two parameters: its diameter and depth. In this letter, we aim to improve the performance of this sensor by changing the diameter of its phase shifting dot. We begin with a general theoretical framework providing an analytical description of the FFWFS properties, then we predict the expected ZWFS sensitivity for different configurations of dot diameters and depths. The analytical predictions are then validated with end-to-end simulations. From this, we propose a variation of the classical ZWFS shape which exhibits extremely appealing properties. We show that the ZWFS sensitivity can be optimized by modifying the dot diameter and even reach the optimal theoretical limit, with a trade-off for low spatial frequencies sensitivity. As an example, we show that a ZWFS with a 2λ/D dot diameter (where λ is the sensing wavelength and D the telescope diameter), hereafter called Z2WFS, exhibits a sensitivity twice higher than the classical 1.06λ/D ZWFS for all the phase spatial components except for tip-tilt modes. Furthermore, this gain in sensitivity does not impact the dynamic range of the sensor, and the Z2WFS exhibits a similar dynamical range as the classical 1.06λ/D ZWFS. This study opens the path to the conception of diameter-optimized ZWFS.
Phase synchronization on scale-free and random networks in the presence of noise
Creators: name: Khoshbakht, Hamid
name: Shahbazi, Farhad
name: Samani, Keivan Aghababaei
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: In this work we investigate the stability of synchronized states for the Kuramoto model on scale-free and random networks in the presence of white noise forcing. We show that for a fixed coupling constant, the robustness of the globally synchronized state against the noise is dependent on the noise intensity on both kinds of networks. At low noise intensities the random networks are more robust against losing the coherency but upon increasing the noise, at a specific noise strength the synchronization among the population vanishes suddenly. In contrast, on scale-free networks the global synchronization disappears continuously at a much larger critical noise intensity respect to the random networks.
Primary Velocity and Orbital Phase Effects on Planetary Detectability from Small Epoch Number Data Sets
Creators: name: Buzard, Cam
name: Pelletier, Stefan
name: Piskorz, Danielle
name: Benneke, Björn
name: Blake, Geoffrey
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Cross correlation analyses of high resolution spectroscopic data have recently shown great success in directly detecting planetary signals and enabling the characterization of their atmospheres. One such technique aims to observe a system at multiple epochs and combine the measured planetary radial velocities from each epoch into a measurement of the planetary Keplerian orbital velocity $K_p$, constituting a direct detection of the planetary signal. Recent work has shown that in few-epoch ($\sim$5) data sets, unintended structure can arise at a high level, obscuring the planetary detection. In this work, we look to simulations to examine whether there are ways to reduce this structured noise in few-epoch data sets by careful planning of observations. The choice of observation date allows observers to select the primary (stellar) velocity - through a set systemic velocity and chosen barycentric velocity - and the planetary orbital phase, and so we focus on the effects of these two parameters. We find that epochs taken when the primary velocity is near zero, and the stellar lines remain relatively fixed to the telluric rest-frame, greatly reduce the level of structured noise and allow for much stronger planetary detections, on average more than twice the significance of detections made with epochs using randomly selected primary velocities. Following these results, we recommend that observers looking to build up high-resolution multi-epoch data sets target nights when their system has a near-zero primary velocity.
description: 16 pages, 9 figures, accepted for publication in AJ
Spin-scattering asymmetry at half-metallic ferromagnet/ferromagnet interface
Creators: name: Fujita, Y.
name: Miura, Y.
name: Sasaki, T.
name: Nakatani, T.
name: Hono, K.
name: Sakuraba, Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study spin-scattering asymmetry at the interface of two ferromagnets (FMs) based on a half-metallic Co$_{2}$Fe$_{0.4}$Mn$_{0.6}$Si (CFMS)/CoFe interface. First-principles ballistic transport calculations based on Landauer formula for (001)-CoFe/CFMS/CoFe indicate strong spin-dependent conductance at the CFMS/CoFe interface, suggesting a large interface spin-scattering asymmetry coefficient ($γ$). Fully epitaxial current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) pseudo-spin-valve (PSV) devices involving CoFe/CFMS/Ag/CFMS/CoFe structures exhibit an enhancement in MR output owing to the formation of the CFMS/CoFe interface at room temperature (RT). This is well reproduced qualitatively by a simulation based on a generalized two-current series-resistor model with considering the presence of $γ$ at the CFMS/CoFe interface, half-metallicity of CFMS, and combinations of terminated atoms at the interfaces in the CPP-GMR PSV structure. We show direct evidence for a large $γ$ at a half-metallic FM/FM interface and its impact on CPP-GMR effect even at RT.
Platycerus Geoffroy 1762
Creators: name: Paulsen, M. J.
name: Caterino, Michael
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Lucanidae
Platycerus

description: Key to the Platycerus species of California 1 Elytra entirely, irregularly punctate (discal rows of punctures indistinct), surface between punctures raised (Fig. 3)..................  P. cribripennis Van Dyke – Elytra serially punctate, discal rows of punctures distinct, surface between punctures not raised.................................................................................... 2 2 Elytra generally with blue or green reflections, males with basal antennomere of club much shorter than distal antennomeres (Fig. 5).............................................................................................................  P. oregonensis Westwood – Elytra dark piceous in color without blue/green reflections, males with basal antennomere of club nearly as long as distal antennomeres (Fig. 4)....................................................................................................  P. marginalis Casey
description: Published as part of Paulsen, M. J. & Caterino, Michael, 2009, The Platycerus (Coleoptera, Lucanidae) of California, with the recognition of Platycerus cribripennis Van Dyke as a valid species, pp. 89-94 in ZooKeys 8 (8) on page 91, DOI: 10.3897/zookeys.8.118, http://zenodo.org/record/576445
V723 Cas (Nova Cassiopeiae 1995): MERLIN observations from 1996 to 2001
Creators: name: Heywood, I.
name: O'Brien, T. J.
name: Eyres, S. P. S.
name: Bode, M. F.
name: Davis, R. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: MERLIN observations of the unusually slow nova V723 Cas are presented. Nine epochs of 6-cm data between 1996 and 2001 are mapped, showing the initial expansion and brightening of the radio remnant, the development of structure and the final decline. A radio light curve is presented and fitted by the standard Hubble flow model for radio emission from novae in order to determine the values of various physical parameters for the shell. The model is consistent with the overall development of the radio emission. Assuming a distance of 2.39 (+/-0.38) kpc and a shell temperature of 17000 K, the model yields values for expansion velocity of 414 +/- 0.1 km s^-1 and shell mass of 1.13 +/- 0.04 * 10^-4 Msolar. These values are consistent with those derived from other observations although the ejected masses are rather higher than theoretical predictions. The structure of the shell is resolved by MERLIN and shows that the assumption of spherical symmetry in the standard model is unlikely to be correct.
description: 6 pages, 6 figures
Matter-antimatter asymmetry induced by non-linear electrodynamics
Creators: name: Benaoum, H. B.
name: Ovgun, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work, we propose an economical model to address some open cosmological problems such as the absence of the initial cosmological singularity, an early acceleration of the Universe and the generation of matter-antimatter asymmetry. The model is based on a scenario in which the early Universe consists of a non-linear electrodynamics fields. It is found that the non-linear electrodynamics model has an equation of state $p=\frac{1}{3} ρ- \frac{4}{3} βρ^{1+α}$ which shows that the Universe undergoes an early epoch acceleration to a radiation era given by $p =\frac{1}{3} ρ$. We show that the singularities in the energy density, pressure and curvature are absent at early stages. In our scenario, the baryon asymmetry is generated by the non-linearity parameter $β$. Additionally, we calculate the resulting baryon asymmetry and discuss how a successful gravitational baryogenesis is obtained for different values of the model's parameter space.
description: To appear in Classical and Quantum Gravity; 12 pages; dedicated to Andrei Sakharov on the occasion of his 100th birthday
title:  Reshoring e catene globali del valore durante e dopo la pandemia
Creators: name: Marvasi  ,  Enrico
Publisher: name: RomaTrE-Press
Year: 2023

description: The Covid-19 pandemic and, more recently, geopolitical tensions related to the war in Ukraine have brought to light some important fragilities of international trade and global value chains (GVCs). In the new, uncertain, scenario, the challenges for businesses and governments are manifold. This paper discusses the consequences of recent shocks on GVCs and firms’ choices in the international context, with particular attention to Italy. The analysis shows that, even before the pandemic, international trade had slowed down, and firms had been operating in an increasingly uncertain global environment for a decade now. Following the shocks, the recovery in trade has been particularly rapid, despite protectionist pressures beginning to emerge from many countries, not always justified from an economic point of view, but certainly motivated by legitimate concerns about the degree of external exposure. The data show, however, that firms have been able to adapt, and few have chosen to bring back previously offshored production activities (reshoring). Meanwhile, GVCs continue to play a major role in international trade. Nonetheless, expensive and difficult adaptations and reconfigurations are underway: the challenge for the future is to understand where the new trends are heading. The article is aimed at an audience that also includes non-experts in economics and international trade. The discussion is non-technical, although based on the scientific literature and the results of some of my recent articles on the subject.
description: Giornate della Ricerca del Dipartimento di Economia di Roma Tre
Heralded generation of multiphoton entanglement
Creators: name: Walther, Philip
name: Aspelmeyer, Markus
name: Zeilinger, Anton
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a scheme, based only on linear optics and standard photon detection, that allows to generate heralded multiphoton entangled states of arbitrary photon number from spontaneous parametric downconversion (PDC) in the weak interaction regime. The scheme also works in the strong interaction regime, i.e., for the production of large photon numbers, when photon-number resolving detectors with nearly perfect quantum efficiency are used. In addition, the same setup can be used for quantum metrology as multiphoton interferometer with sensitivity at the Heisenberg limit.
description: 5 pages, 2 figures
Inflation and Supersymmetry Breaking in Higgs-$R^2$ Supergravity
Creators: name: Aoki, Shuntaro
name: Lee, Hyun Min
name: Menkara, Adriana G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a new construction of the supergravity inflation as an UV completion of the Higgs-$R^2$ inflation. In the dual description of $R^2$-supergravity, we show that there appear dual chiral superfields containing the scalaron or sigma field in the Starobinsky inflation, which unitarizes the supersymmetric Higgs inflation with a large non-minimal coupling up to the Planck scale. We find that a successful slow-roll inflation is achievable in the Higgs-sigma field space, but under the condition that higher curvature terms are introduced to cure the tachyonic mass problems for spectator singlet scalar fields. We also discuss supersymmetry breaking and its transmission to the visible sector as a result of the couplings of the dual chiral superfields and the non-minimal gravity coupling of the Higgs fields.
description: 32 pages, 5 figures. v2 : Minor corrections, references added
title:  Cyber catastrophe bond come strumento per il trasferimento del rischio informatico
Creators: name: Mastroeni  , Loretta
name: Mazzoccoli, Alessandro
Publisher: name: RomaTrE-Press
Year: 2023

description: The use of the cloud, and in particular cloud services for storing personal or business data and for running programmes, is becoming increasingly popular, as it is an efficient and cost-effective practice. However, cloud services may not always be available, potentially causing significant losses for both customers and service providers. Typically, in such cases, the provider is obliged to compensate its customers in case of interruptions. However, in order to protect itself against such losses, the supplier may take out an insurance contract, transferring the risk to the insurer and paying an insurance premium. It should be noted that in situations where the cloud service is rarely available, the amount that the insurer would have to reimburse the cloud service provider could become so high as to jeopardise the insurer’s own financial stability. In this study, we propose the adoption of catastrophe bonds as a reinsurance instrument. Specifically, we develop a closed-form formula to determine cat bond prices in the presence of stochastic interest rates. Furthermore, we demonstrate the practical applicability of our pricing formula in a real-world context.
description: Giornate della Ricerca del Dipartimento di Economia di Roma Tre
Scuola Odori 2021
Creators: name: cipriano, domenico
name: cefalì, amedeo manuel
name: Andretta, Massimo
name: bonasoni, paolo
name: Mauro, Francesca Romana
name: Capelli, Laura
name: Bax, Carmen
name: Polvara, Elisa
name: Tagliaferri, Francesca
Publisher: name: figshare
Year: 2021
Subjects: subject: 50206 Environmental Monitoring
subject: FOS: Earth and related environmental sciences

description: Atti dei webinar relativi alla Scuola Odori 2021
Symmetry of standing waves generated by a point defect in epitaxial graphene
Creators: name: Simon, L.
name: Bena, C.
name: Vonau, F.
name: Aubel, D.
name: Nasrallah, H.
name: Habar, M.
name: Perruchetti, J. C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Using scanning tunneling microscopy (STM) and Fourier Transform STM (FT-STM), we have studied a point defect in an epitaxial graphene sample grown on silicon carbide substrate. This analysis allows us to extract the quasiparticle energy dispersion, and to give a first experimental proof of the validity of Fermi liquid theory in graphene for a wide range of energies from -800 meV to +800 meV. We also find evidence of a strong threefold anisotropy in the standing waves generated by the defect. We discuss possible relations between this anisotropy, the chirality of the electrons, and the asymmetry between graphene's two sublattices. All experimental measurements are compared and related to theoretical T-matrix calculations.
description: 4 pages, 4 figures
Smoothing locally regular processes by Bayesian nonparametric methods, with applications to acid rain data analysis
Creators: name: Ma, Hon Wai
Publisher: name: University of British Columbia
Year: 2010

description: We consider the problem of recovering an unknown smooth function from the data using the Bayesian nonparametric approach proposed by Weerahandi and Zidek (1985). Selected nonparametric smoothing methods are reviewed and compared with this new method. At each value of the independent variable, the smooth function is assumed to be expandable in a Taylor series to the pth order. Two methods, cross-validation and "backfitting" are used to estimate the a priori unspecified hyperparameters. Moreover, a data-based procedure is introduced to select the appropriate order p. Finally, an analysis of an acid-rain, wet-deposition time series is included to indicate the efficacy of the proposed methods.
Lorentz-CPT violation, radiative corrections and finite temperature
Creators: name: Brito, F. A.
name: Nascimento, J. R.
name: Passos, E.
name: Petrov, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work we investigate the radiatively induced Chern-Simons-like terms in four-dimensions at zero and finite temperature. We use the approach of rationalizing the fermion propagator up to the leading order in the CPT-violating coupling $b_μ$. In this approach, we have shown that although the coefficient of Chern-Simons term can be found unambiguously in different regularization schemes at zero or finite temperature, it remains undetermined. We observe a correspondence among results obtained at finite and zero temperature.
description: To appear in JHEP, 10 pages, 1 eps figure, minor changes and references added
Effects of Some Medicinal Plant Extracts for Controlling Root-knot Nematode Meloidogyne incognita (Kofoid and White, 1919) Chitwood, 1949
Creators: name: Pimwipa Lippanont
name: Pornsuk Chaisuk
Publisher: name: Faculty of Agriculture
Year: 2019
Subjects: Nematode Meloidogyne incognita, garlic extract, neem extract, marigold extract, biological control

description: Khon Kaen Agriculture Journal, 47, 3, 609-616
Supporting data and information for research journal contribution comparing the performance of CuTiO2 photocatalyst in two photoreduction reactions that is nitrogen reduction reaction and nitrate reduction reactions for small scale ammonia production.
Creators: name: Mokamba, Josephat
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 401807
subject: Nanomaterials
classificationCode: 400408
subject: Reaction engineering (excl. nuclear reactions)

description: Description of the nitrogen fixation and nitrate reduction reaction mechanisms and ammonium standard calibration curves prepared for ammonia quantification as the primary byproduct of the two reaction mechanisms.
A Constraint on Z_\odot from Fits of Isochrones to the Color-Magnitude Diagram of M67
Creators: name: VandenBerg, Don A.
name: Gustafsson, Bengt
name: Edvardsson, Bengt
name: Eriksson, Kjell
name: Ferguson, Jason
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The mass at which a transition is made between stars that have radiative or convective cores throughout the core H-burning phase is a fairly sensitive function of Z (particularly the CNO abundances). As a consequence, the ~4 Gyr, open cluster M67 provides a constraint on Z_\odot (and the solar heavy-element mixture) because (i) high-resolution spectroscopy indicates that this system has virtually the same metal abundances as the Sun, and (ii) its turnoff stars have masses just above the lower limit for sustained core convection on the main sequence. In this study, evolutionary tracks and isochrones using the latest MARCS model atmospheres as boundary conditions have been computed for 0.6-1.4 solar masses on the assumption of a metals mix (implying Z_\odot = 0.0125) based on the solar abundances derived by M. Asplund and collaborators using 3-D model atmospheres. These calculations do not predict a turnoff gap where one is observed in M67. No such difficulty is found if the analysis uses isochrones for Z_\odot = 0.0165, assuming the Grevesse & Sauval (1998) mix of heavy elements. Our findings, like the inferences from helioseismology, indicate a problem with the Asplund et al. abundances. However, it is possible that low-Z models with diffusive processes taken into account will be less problematic.
description: 13 pages, including 2 figures and 1 table; accepted (July 2007) for publication in the Astrophysical Journal Letters
Programme - For the Fallen
Creators: name: Newall, Helen
name: Baker, Matt
Publisher: name: Edge Hill University
Year: 2021
Subjects: subject: 190402 Creative Writing (incl. Playwriting)
subject: FOS: Arts (arts, history of arts, performing arts, music)
subject: 190404 Drama, Theatre and Performance Studies

description: Programme given free to audience members attending For the Fallen, St Mary's Creative Space, Chester.
Written by Helen NewallOriginal music by Matt BakerTheatre in the Quarter.
Dimensional regularization of the gravitational interaction of point masses in the ADM formalism
Creators: name: Damour, Thibault
name: Jaranowski, Piotr
name: Schäfer, Gerhard
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The ADM formalism for two-point-mass systems in $d$ space dimensions is sketched. It is pointed out that the regularization ambiguities of the 3rd post-Newtonian ADM Hamiltonian considered directly in $d=3$ space dimensions can be cured by dimensional continuation (to complex $d$'s), which leads to a finite and unique Hamiltonian as $d\to3$. Some so far unpublished details of the dimensional-continuation computation of the 3rd post-Newtonian two-point-mass ADM Hamiltonian are presented.
description: To appear in "Proceedings of the 11th Marcel Grossmann Meeting on General Relativity", edited by H.Kleinert, R.T.Jantzen and R.Ruffini, World Scientific, Singapore, 2008
Learning User's confidence for active learning
Creators: name: Tuia, Devis
name: Munoz-Mari, Jordi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we study the applicability of active learning in operative scenarios: more particularly, we consider the well-known contradiction between the active learning heuristics, which rank the pixels according to their uncertainty, and the user's confidence in labeling, which is related to both the homogeneity of the pixel context and user's knowledge of the scene. We propose a filtering scheme based on a classifier that learns the confidence of the user in labeling, thus minimizing the queries where the user would not be able to provide a class for the pixel. The capacity of a model to learn the user's confidence is studied in detail, also showing the effect of resolution is such a learning task. Experiments on two QuickBird images of different resolutions (with and without pansharpening) and considering committees of users prove the efficiency of the filtering scheme proposed, which maximizes the number of useful queries with respect to traditional active learning.
The luminous X-ray hotspot in 4C 74.26: synchrotron or inverse-Compton emission?
Creators: name: Erlund, M. C.
name: Fabian, A. C.
name: Blundell, Katherine M.
name: Moss, C.
name: Ballantyne, D. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of an X-ray counterpart to the southern radio hotspot of the largest-known radio quasar 4C 74.26 (whose redshift is z=0.104). Both XMM-Newton and Chandra images reveal the same significant (10arcsec, i.e. 19kpc) offset between the X-ray hotspot and the radio hotspot imaged with MERLIN. The peak of the X-ray emission may be due to synchrotron or inverse-Compton emission. If synchrotron emission, the hotspot represents the site of particle acceleration and the offset arises from either the jet exhibiting Scheuer's `dentist's drill' effect or a fast spine having less momentum than the sheath surrounding it, which creates the radio hotspot. If the emission arises from the inverse-Compton process, it must be inverse-Compton scattering of the CMB in a decelerating relativistic flow, implying that the jet is relativistic (Gamma >= 2) out to a distance of at least 800kpc. Our analysis, including optical data from the Liverpool Telescope, rules out a background AGN for the X-ray emission and confirms its nature as a hotspot, making it the most X-ray luminous hotspot yet detected.
description: 9 pages, 9 figures, definitive version published by MNRAS
Permutation classes of every growth rate above 2.48188
Creators: name: Vatter, Vincent
Publisher: name: arXiv
Year: 2008
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: We prove that there are permutation classes (hereditary properties of permutations) of every growth rate (Stanley-Wilf limit) at least λ\approx 2.48187, the unique real root of x^5-2x^4-2x^2-2x-1, thereby establishing a conjecture of Albert and Linton.
description: Several minor changes, as well as a change in title. To appear in Mathematika
On Optimum Power Allocation for the V-BLAST
Creators: name: Kostina, Victoria
name: Loyka, Sergey
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: A unified analytical framework for optimum power allocation in the unordered V-BLAST algorithm and its comparative performance analysis are presented. Compact closed-form approximations for the optimum power allocation are derived, based on average total and block error rates. The choice of the criterion has little impact on the power allocation and, overall, the optimum strategy is to allocate more power to lower step transmitters and less to higher ones. High-SNR approximations for optimized average block and total error rates are given. The SNR gain of optimization is rigorously defined and studied using analytical tools, including lower and upper bounds, high and low SNR approximations. The gain is upper bounded by the number of transmitters, for any modulation format and type of fading channel. While the average optimization is less complex than the instantaneous one, its performance is almost as good at high SNR. A measure of robustness of the optimized algorithm is introduced and evaluated. The optimized algorithm is shown to be robust to perturbations in individual and total transmit powers. Based on the algorithm robustness, a pre-set power allocation is suggested as a low-complexity alternative to the other optimization strategies, which exhibits only a minor loss in performance over the practical SNR range.
description: Accepted by IEEE Transactions on Communications, Apr. 2007
The CMB Quadrupole depression produced by early fast-roll inflation: MCMC analysis of WMAP and SDSS data
Creators: name: Destri, C.
name: de Vega, H. J.
name: Sanchez, N. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Generically,the classical evolution of the inflaton has a brief fast roll stage that precedes the slow roll regime. The fast roll stage leads to a purely attractive potential for the curvature and tensor perturbations (this potential is purely repulsive in slowroll). This attractive potential depresses the CMB quadrupole moment for the curvature and B-mode spectra. A single new cosmological parameter emerges: the comoving wavenumber k_1 characteristic scale of this attractive potential.k_1 happens to exit the horizon precisely at the transition from fast to slowroll.The fastroll stage dynamically modifies the initial power spectrum by a transfer function D(k). We compute D(k) by solving the inflaton evolution equations. D(k) suppresses the primordial power for k < k_1 and enjoys the scaling property D(k) = Psi(k/k_1) where Psi(x) is an universal function. We perform a MCMC analysis of the WMAP/SDSS data including the fast-roll stage and find k_1 = 0.266/Gpc. The quadrupole mode k_Q = 0.242/Gpc exits the horizon 1/10 of an efold before k_1. We compare the fastroll fit with a fit with a sharp lower cutoff on the primordial power. Fastroll provides a slightly better fit than a sharp cutoff for the TT,TE and EE modes.Moreover, our fits provide non-zero lower bounds for r, while for the other cosmological parameters we essentially get those of the LCDM model. The fact that k_Q exits the horizon before the slowroll stage implies an upper bound in the total number of efolds N_{tot} during inflation.Combining this with estimates during the radiation dominated era we obtain N_{tot} ~ 66, with the bounds 62 < N_{tot} < 82.We repeated the analysis with the WMAP-5/ACBAR-2007/SDSS data confirming the overall picture.
description: 23 pages, 11 figures. Expanded and improved version to appear in Phys Rev D
DNA extraction protocols from Assessment of DNA extraction methods for human gut mycobiome analysis
Creators: name: Rintarhat, Piyapat
name: Cho, Yong-Joon
name: Koh, Hong
name: Park, Sowon
name: Lee, Eun Joo
name: Lim, Hyeji
name: Noh, Jihye
name: Lee, Dong-Woo
name: Jung, Won Hee
Publisher: name: The Royal Society
Year: 2023
Subjects: classificationCode: 310401
subject: Animal systematics and taxonomy
classificationCode: 310411
subject: Plant and fungus systematics and taxonomy
classificationCode: 310509
subject: Genomics
classificationCode: 310799
subject: Microbiology not elsewhere classified

description: DNA extraction protocols
Development of a New Electro-thermal Simulation Tool for RF Circuits
Creators: name: Nowakowski, Jerzy
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2008

description: Thermal interactions set a tremendous challenge for electronic designers, and a device/system can not be considered anymore as purely electrical one, since exists a strong interaction between operating temperature and electrical operating point. As a consequence, the electronic industry has a huge necessity of electro-thermal simulation tools, which will be able to take both thermal and electrical interactions into account during a design process. The Ph. D. research activity was pursued towards the development of electro-thermal simulation tool based on commercially available software by Agilent, called Advanced Design System (ADS). The ADS is currently the electronic industry standard tool for Radio-Frequency simulation. The task has been completed successfully, and the working electro-thermal code has been created.
La retribuzione dalla corrispettività alla effettività
Creators: name: Nusco, Luisa Emilia
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2008

description: L'elaborato contiene l'analisi del percorso che ha condotto la retribuzione ad affrancarsi progressivamente dal nesso sinallagmatico di tipo civilistico. Nell'attuale contesto economico, la retribuzione pare ricorre alla effettività della retribuzione svolta dal lavoratore come prioritario parametro per la sua determinazione.
La propagazione delle piene negli alvei a fondo mobile
Creators: name: Palumbo, Anna
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2008

description: Un modello numerico monodimensionale ai volumi finiti è sviluppato al fine di poter interpretare i fenomeni evolutivi a cui sono soggetti gli alvei naturali, per effetto del trasporto solido. Il modello, di tipo accoppiato, è in grado di portare in conto condizioni di non-equilibrio del trasporto solido. Inoltre la scrittura delle equazioni alla base del modello e la distribuzione del materiale eroso/depositato è effettuata con riferimento a canali non prismatici di sezione generica. Il modello numerico è poi validato mediante una serie di test eseguiti con riferimento a casi di cui è noto, a priori, il comportamento fisico del fenomeno e/o la soluzione, e ad esperienze condotte in laboratorio.
Relating the thermodynamic arrow of time to the causal arrow
Creators: name: Allahverdyan, Armen E.
name: Janzing, Dominik
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Consider a Hamiltonian system that consists of a slow subsystem S and a fast subsystem F. The autonomous dynamics of S is driven by an effective Hamiltonian, but its thermodynamics is unexpected. We show that a well-defined thermodynamic arrow of time (second law) emerges for S whenever there is a well-defined causal arrow from S to F and the back-action is negligible. This is because the back-action of F on S is described by a non-globally Hamiltonian Born-Oppenheimer term that violates the Liouville theorem, and makes the second law inapplicable to S. If S and F are mixing, under the causal arrow condition they are described by microcanonic distributions P(S) and P(S|F). Their structure supports a causal inference principle proposed recently in machine learning.
description: 10 pages
Экологическое образование на Географическом факультете МГПУ
Creators: name: Дмитриева В.Т.
name: Воробьёв А.Н.
name: А.Н., Ямсков
Publisher: name: Zenodo
Year: 1999
Subjects: географическое образование
экологическое образование
педагогический университет

description: Вводная статья к сборнику программ экологических дисциплин, читавшихся на Географическом факультете Московского городского педагогического университета в рамках подготовки по совмещенной специальности «Учитель географии и экологии». Представлен разработанный профессором В.Т. Дмитриевой новаторский подход к интеграции географического и экологического образования в педагогическом университете, в т.ч. таблицы с распределением экологических курсов по годам и семестрам обучения и учебной нагрузкой по каждому из них.
Mary Edmonia Lewis's Hagar and the Promise of Salvation
Creators: name: Kruse, Amy
Publisher: name: American University
Year: 2023
Subjects: classificationCode: 3601
subject: Art history, theory and criticism
classificationCode: 500401
subject: Christian studies
classificationCode: 500405
subject: Religion, society and culture

description: My thesis focuses on Mary Edmonia Lewis’s (1844-1907) marble statue, Hagar (1868), which she created while living in Rome and likely once she had converted to Catholicism. The fully clothed, standing, white marble woman clasps her hands together as she gazes upwards to God; her brow furrows and reveals her ultimately deemed Caucasian features. Hagar was the handmaid and slave of Abraham’s wife, Sarah, from the Old Testament. The biblical figure was seen by God in all her hurt and bitterness, and all the unfairness of her life and rewarded for her survival. Artists have long represented Hagar as an enslaved person, a sexual abuse survivor, and a foreigner. As a Black and Indigenous female sculptor, Lewis took a different approach. Her sculpture, which was created in Rome underscores Hagar’s connection with God rather than her relationships with men. Whereas other scholars have read the work as a metaphor for abolitionist sentiments, I reveal the ways in which Lewis sought to prioritize spiritual salvation versus terrestrial deliverance. Chapter One of my thesis locates Lewis’s Hagar in the broader art historical canon to reveal that Lewis’s depiction is more pious and isolated than prior depictions. Lewis isolates Hagar to draw attention to Hagar’s direct connection to God and her biblical importance. The chapter also investigates praying iconography and its association with the anti-slavery movement. In doing so, Lewis is emphasizing a connection between God and salvation, specifically through supplication. The second chapter argues that Lewis depicted Hagar as White in white marble to represent Godliness. Lewis’s Hagar sculpture is often perceived as Caucasian while Hagar was biblically and historically recognized as Black; reading the work in relation to other neoclassical sculptures, especially Hiram Powers (1805-1873) The Greek Slave (1844), the chapter explains how the subject’s race and the artist’s choice of material furthered the sculpture’s spiritual message.This thesis argues against analyzing Lewis’s sculptures with exclusively a racial or biographical lens and rather offers a more nuanced interpretation of Lewis’s use of religious themes in her all of her work. By forefronting Lewis’s Christianity, which is so obviously prevalent in Hagar’s iconography, the thesis sets an example of how fellow scholars can understand and interpret African American Christianity in other artists from the period’s work.
Platycerus Geoffroy 1762
Creators: name: Paulsen, M. J.
name: Caterino, Michael
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Lucanidae
Platycerus

description: Platycerus Geoffroy, 1762: 62. Holarctic.  Platycerus cribripennis Van Dyke, 1928: 107. Figs 1-3. USA: CA: Kern, Monterey, San Luis Obispo, Santa Barbara.
description: Published as part of Paulsen, M. J. & Caterino, Michael, 2009, The Platycerus (Coleoptera, Lucanidae) of California, with the recognition of Platycerus cribripennis Van Dyke as a valid species, pp. 89-94 in ZooKeys 8 (8) on page 93, DOI: 10.3897/zookeys.8.118, http://zenodo.org/record/576445
description: {"references": ["Van Dyke EC (1928) Notes and descriptions of new species of Lucanidae and Cerambycidae (Coleoptera) from western North America. Pan-Pacific Entomologist 4: 105 - 113."]}
Experiments on Multidimensional Solitons
Creators: name: Brand, Joachim
name: Carr, L. D.
name: Anderson, B. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: This article presents an overview of experimental efforts in recent years related to multidimensional solitons in Bose-Einstein condensates. We discuss the techniques used to generate and observe multidimensional nonlinear waves in Bose-Einstein condensates with repulsive interactions. We further summarize observations of planar soliton fronts undergoing the snake instability, the formation of vortex rings, and the emergence of hybrid structures.
description: review paper, to appear as Chapter 5b in "Emergent Nonlinear Phenomena in Bose-Einstein Condensates: Theory and Experiment," edited by P. G. Kevrekidis, D. J. Frantzeskakis, and R. Carretero-Gonzalez (Springer-Verlag)