cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Critical scaling and heterogeneous superdiffusion across the jamming/rigidity transition of a granular glass
Creators: name: Lechenault, F.
name: Dauchot, O.
name: Biroli, G.
name: Bouchaud, J. -P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The dynamical properties of a dense horizontally vibrated bidisperse granular monolayer are experimentally investigated. The quench protocol produces states with a frozen structure of the assembly, but the remaining degrees of freedom associated with contact dynamics control the appearance of macroscopic rigidity. We provide decisive experimental evidence that this transition is a critical phenomenon, with increasingly collective and heterogeneous rearrangements occurring at length scales much smaller than the grains' diameter, presumably reflecting the contact force network fluctuations. Dynamical correlation time and length scales soar on both sides of the transition, as the volume fraction varies over a remarkably tiny range ($δϕ/ϕ\sim 10^{-3}$). We characterize the motion of individual grains, which becomes super-diffusive at the jamming transition $ϕ_J$, signaling long-ranged temporal correlations. Correspondingly, the system exhibits long-ranged four-point dynamical correlations in space that obey critical scaling at the transition density.
description: 4 pages, 8 figures
Débattre de sujets d’actualité, piolitiques et de société, en conseil de coopération
Creators: name: Dittgen, Michell W.
Publisher: name: Universität Trier
Year: 2019
Subjects: subject: Kultur
subject: Schule
subject: Schulentwicklung
subject: Schüler
subject: demokratische Erziehung
subject: politische Pädagogik
subject: culture
subject: school
subject: school development
subject: pupils
subject: democracy education
subject: education of politics

description: Faut-il interdire les emballages en plastique ? Quels arguments s’opposent au droit de vote à partir de 14 ans ? Quelles sont les conséquences du Brexit sur l’Europe ? – Ce type de questions a toute sa place en conseil de coopération, car leur discussion offre des possibilités d’apprentissage des processus démocratiques.
Supplementary material for detailed mathematical manipulation from Pair approximation model for the vaccination game: predicting the dynamic process of epidemic spread and individual actions against contagion
Creators: name: Kuga, Kazuki
name: Tanaka, Masaki
name: Tanimoto, Jun
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 10109 Ordinary Differential Equations, Difference Equations and Dynamical Systems
subject: FOS: Mathematics
subject: 10110 Partial Differential Equations
subject: 10302 Numerical Solution of Differential and Integral Equations
subject: 10399 Numerical and Computational Mathematics not elsewhere classified
subject: 19999 Mathematical Sciences not elsewhere classified

description: Calculations for the pair approximation SIR model, effectiveness of vaccination, efficiency of intermediate protective measures and transition probabilities for connections
Supplementary material for source codes generating results of numerical simulation from Pair approximation model for the vaccination game: predicting the dynamic process of epidemic spread and individual actions against contagion
Creators: name: Kuga, Kazuki
name: Tanaka, Masaki
name: Tanimoto, Jun
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: 10109 Ordinary Differential Equations, Difference Equations and Dynamical Systems
subject: FOS: Mathematics
subject: 10110 Partial Differential Equations
subject: 10302 Numerical Solution of Differential and Integral Equations
subject: 10399 Numerical and Computational Mathematics not elsewhere classified
subject: 19999 Mathematical Sciences not elsewhere classified

description: Source codes of numerical simulation
Avaliando para melhorar a Aprendizagem (SLIDES)
Creators: name: Valadares, Jorge
Publisher: name: Zenodo
Year: 2004
Subjects: Avaliação formadora
Aprendizagem Significativa

description: Este é um dos 54 Cursos de Formação de Professores por mim realizados entre 1982 e 2008, a maior parte deles de índole-teórico-prática.

Estes slides ilustram a componente teórica de um Curso de 25 horas intitulado « Avaliando para melhorar a Aprendizagem».  Foi organizado pelo Centro de Formação do Calhabé de Coimbra e integrado no programa FOCO, tendo decorrido no mês de Setembro antes do início dsa aulas.
Reproductive dynamics of the parasitoid, Spalangi endius (Walker) (Hymenoptera: Pteromalidae), with particular reference to host-searching and host-acceptance behavior
Creators: name: Jones, James William
Publisher: name: University of British Columbia
Year: 2010

description: Oviposition and related behaviour in the host searching and host acceptance repertoire of Spalangia endius (Walker) were examined to determine how such behaviour might be controlled by the presence of mature eggs in this parasitic insect. In all experiments, Musca domestica L. pupae were the hosts. Host searching was observed in glass petri-dish arenas containing a sawdust substrate, half of which was contaminated with the odour of mature host larvae. The effects on searching behaviour of a series of ovipositions by one set of parasitoid females could not be distinguished from a control group that did not oviposit. A study of burrowing indicated that one-quarter of the population sampled could not exploit hosts buried in the sawdust substrate. The portion of search time that was spent in antennal investigation of the substrate and burrowing in the substrate was found to increase with fecundity. The probability that given hosts would produce parasite progeny was predictable for one- and two-day-old females that were given a series of hosts to attack in succession; the second and seventh hosts always produced progeny. Mated females were more fecund than virgins; the patterns of oviposition observed in mated and virgin females suggested that mating releases oviposition inhibition.
Calibration of the galaxy cluster M_500-Y_X relation with XMM-Newton
Creators: name: Arnaud, M.
name: Pointecouteau, E.
name: Pratt, G. W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The quantity Y_ X, the product of the X-ray temperature T_ X and gas mass M_ g, has recently been proposed as a robust low-scatter mass indicator for galaxy clusters. Using precise measurements from XMM-Newton data of a sample of 10 relaxed nearby clusters, spanning a Y_ X range of 10^13 -10^15 M_sun keV, we investigate the M_500-Y_ X relation. The M_500 - Y_ X data exhibit a power law relation with slope alpha=0.548 \pm 0.027, close to the self-similar value (3/5) and independent of the mass range considered. However, the normalisation is \sim 20% below the prediction from numerical simulations including cooling and galaxy feedback. We discuss two effects that could contribute to the normalisation offset: an underestimate of the true mass due to the HE assumption used in X-ray mass estimates, and an underestimate of the hot gas mass fraction in the simulations. A comparison of the functional form and scatter of the relations between various observables and the mass suggest that Y_ X may indeed be a better mass proxy than T_ X or M_g,500.
description: 4 pages, 2 figures, accepted for publication in A&A
Multi-messenger study of the Milky Way with LISA, Gaia and LSST
Creators: name: Korol Valeriya
Publisher: name: Zenodo
Year: 2019

description: Ultra-short period double white dwarf (DWD) binaries are unique multi-messenger tracers of the Milky Way. They can be detected in large numbers through electromagnetic radiation by Gaia and through gravitational waves by the upcoming LISA mission. I will show that the synergies between gravitational waves and optical observations of DWDs allow the study of the Milky Way baryonic structure. The success of this synergy is due to LISA's ability to localise binaries through virtually the whole Galactic plane; thus mapping its shape; while Gaia observations yield the motion of stars; tracing the underlying total enclosed mass.
Preferred-Frame and CP-Violation Tests with Polarized Electrons
Creators: name: Heckel, B. R.
name: Adelberger, E. G.
name: Cramer, C. E.
name: Cook, T. S.
name: Schlamminger, S.
name: Schmidt, U.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We used a torsion pendulum containing $\approx 10^{23}$ polarized electrons to search new interactions that couple to electron spin. We limit CP-violating interactions between the pendulum's electrons and unpolarized matter in the earth or the sun, test for rotation and boost-dependent preferred-frame effects using the earth's rotation and velocity with respect to the entire cosmos, and search for exotic velocity-dependent potentials between polarized electrons and unpolarized matter in the sun and moon. Finally, we find that the gravitational mass of an electron spinning toward the galactic center differs by less than about 1 part in $10^{21}$ from an electron spinning in the opposite direction. As a byproduct of this work, the density of polarized electrons in Sm$ $Co$_5$ was measured to be $(4.19\pm 0.19)\times 10^{22} {\rm cm}^{-3}$ at a field of 9.6 kG.
description: 54 pages, 18 figures, Submitted to PRD
Atmospheric, long baseline, and reactor neutrino data constraints on $θ_{13}$
Creators: name: Roa, J. E.
name: Latimer, D. C.
name: Ernst, D. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A new atmospheric neutrino oscillation tool which utilizes full three neutrino oscillation probabilities and a full three neutrino treatment of the MSW effect is combined with a standard analysis of the K2K, MINOS, and CHOOZ data to examine the bounds on $θ_{13}$ implied by existing data, including the recent, more finely binned, Super-K atmospheric data. In the region $L/E_ν\gtrsim 10^4$ km/GeV, we have previously found that the sub-dominant expansion does not converge and that terms linear in $θ_{13}$ can be significant. The current analysis confirms this and leads to the conclusion that $θ_{13}$ is bounded from above by the atmospheric data while CHOOZ provides the lower bound. We trace the origin of this result to fully contained data in the previously mentioned very long baseline region, to a combination of a quadratic in $θ_{13}$ term in ${\mathcal P}_{ee}$ and a linear term in ${\mathcal P}_{eμ}$ and their contribution to $R_e$, a broad MSW resonance for the solar mass-squared difference at 180 MeV, and an increase in $θ_{12}$ due to this resonant matter effect which alters the sign of the linear in $θ_{13}$ term. Assuming CP is conserved in the lepton sector, we find $θ_{13}=-0.07^{+0.18}_{-0.11}$, the asymmetry being a reflection of the importance of the linear in $θ_{13}$ terms.
description: 4 pages, 5 figures, typos corrected, manuscript shortened
Campodea (Dicampa) plagiaria Silvestri 1932
Creators: name: Sendra, Alberto
name: Reboleira, Ana Sofia P. S.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplura
Campodeidae
Campodea
Campodea plagiaria

description: Campodea (Dicampa) plagiaria Silvestri, 1932
Table 2
Campodea (Dicampa) plagiaria Silvestri, 1932b: 83, figs VI–VII.
Diagnosis (Silvestri 1932b)
Body length 4–5 mm; epicuticle with microsenticles; short clothing setae; antennae with 26–28 antennomeres; sensillum in ventral position; short notal macrosetae with a few distal barbs except the long lp macrosetae with barbs along distal two-thirds; short thin pine cone notal marginal; 1+1 la macrosetae on V urotergite; 1+1 la, 1+1 lp on VI–VII urotergites, 3+3 lp on VIII and 5+5 lp on IX abdominal segment; cerci with 12 articles covered with long macrosetae with barbs and a few clothing setae.
Taxonomic notes
A cave-adapted population of C (D) aff. plagiaria found in a cave in the northeast of Morocco (Supplementary file 2) has a body length of 4.3–6.4 mm; epicuticle with microdenticles; clothing setae with a tiny distal barb; up to 49 antennomeres with up to 12 complex olfactory chemoreceptors in its cupuliform organ; sensillum of third antennomere in ventral position; short (ma, la) and long (lp) barbed notal macrosetae; long thin pine cone notal marginal setae; more than 27 articles in an incomplete cercus; elongated appendages (see Table 2). A non-cave-adapted population of C. (D.) plagiaria was found at the entrance of a cave in the extreme south of the Iberian Peninsula that allows to complete the original description with some unknown taxonomic features.
Habitat and distribution
Soil-dwelling species found at a single locality in the Rif Mountains, Morocco (Silvestri 1932a). A caveadapted form and a non-cave-adapted population have been found at the entrance of a cave in the Sierra de Grazalema Natural Park, southern Iberian Peninsula (250 km from the type locality in North Africa).
description: Published as part of Sendra, Alberto & Reboleira, Ana Sofia P. S., 2020, Euro-Mediterranean fauna of Campodeinae (Campodeidae, Diplura), pp. 1-130 in European Journal of Taxonomy 728 on pages 76-77, DOI: 10.5852/ejt.2020.728.1181, http://zenodo.org/record/4316883
Report on initiatives, strategies and roadmaps that contribute to foresight in ocean observation
Creators: name: Muñiz Piniella, Ángel
name: Heymans, JJ Sheila
Publisher: name: Zenodo
Year: 2020
Subjects: ocean observation
forecasting
Europe
foresight

description: EU Horizon 2020 EuroSea project deliverable on identifying existing initiatives in foresight in ocean observation, emerging strategies and roadmaps. Led by European Marine Board. This report captures the major foresight initiatives and documents relevant for European ocean observation and forecasting. After introducing the definition of foresight and the scope of this report (chapter 1), more than 120 initiatives, strategies and roadmaps contributing to foresight in ocean observation are listed and briefly analysed (chapter 2). These include international frameworks and coordination efforts (chapter 2.1), European Union’s frameworks and community coordination efforts (chapter 2.2), and ocean and sea basin relevant actors and efforts (chapter 2.3). Final remarks and opportunities are then provided (chapter 4).
The initial conditions of star formation in the Ophiuchus main cloud: Kinematics of the protocluster condensations
Creators: name: André, Ph.
name: Belloche, A.
name: Motte, F.
name: Peretto, N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The earliest phases of clustered star formation and the origin of the stellar initial mass function (IMF) are currently much debated. In order to constrain the origin of the IMF, we investigated the internal and relative motions of starless condensations and protostars previously detected by us in the dust continuum at 1.2mm in the L1688 protocluster of the Ophiuchus molecular cloud complex. The starless condensations have a mass spectrum resembling the IMF and are therefore likely representative of the initial stages of star formation in the protocluster. We carried out detailed molecular line observations, including some N2H+(1-0) mapping, of the Ophiuchus protocluster condensations using the IRAM 30m telescope. We measured subsonic or at most transonic levels of internal turbulence within the condensations, implying virial masses which generally agree within a factor of ~ 2 with the masses derived from the 1.2mm dust continuum. This supports the notion that most of the L1688 starless condensations are gravitationally bound and prestellar in nature. We measured a global one-dimensional velocity dispersion of less than 0.4 km/s between condensations. This small relative velocity dispersion implies that, in general, the condensations do not have time to interact with one another before evolving into pre-main sequence objects. Our observations support the view that the IMF is partly determined by cloud fragmentation at the prestellar stage. Competitive accretion is unlikely to be the dominant mechanism at the protostellar stage in the Ophiuchus protocluster, but it may possibly govern the growth of starless, self-gravitating condensations initially produced by gravoturbulent fragmentation toward an IMF, Salpeter-like mass spectrum.
description: 17 pages, 8 figures. A&A, in press (v2: notes added to Table 3)
On measuring the Hubble constant with X-ray reverberation mapping of active galactic nuclei
Creators: name: Ingram, Adam
name: Mastroserio, Guglielmo
name: van der Klis, Michiel
name: Nathan, Edward
name: Connors, Riley
name: Dauser, Thomas
name: García, Javier A.
name: Kara, Erin
name: König, Ole
name: Lucchini, Matteo
name: Wang, Jingyi
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We show that X-ray reverberation mapping can be used to measure the distance to type 1 active galactic nuclei (AGNs). This is because X-ray photons originally emitted from the `corona' close to the black hole irradiate the accretion disc and are re-emitted with a characteristic `reflection' spectrum that includes a prominent $\sim 6.4$ keV iron emission line. The shape of the reflection spectrum depends on the irradiating flux, and the light-crossing delay between continuum photons observed directly from the corona and the reflected photons constrains the size of the disc. Simultaneously modelling the X-ray spectrum and the time delays between photons of different energies therefore constrains the intrinsic reflected luminosity, and the distance follows from the observed reflected flux. Alternatively, the distance can be measured from the X-ray spectrum alone if the black hole mass is known. We develop a new model of our RELTRANS X-ray reverberation mapping package, called RTDIST, that has distance as a model parameter. We simulate a synthetic observation that we fit with our new model, and find that this technique applied to a sample of $\sim 25$ AGNs can be used to measure the Hubble constant with a $3 σ$ statistical uncertainty of $\sim 6~{\rm km}~{\rm s}^{-1}{\rm Mpc}^{-1}$. Since the technique is completely independent of the traditional distance ladder and the cosmic microwave background radiation, it has the potential to address the current tension between them. We discuss sources of modelling uncertainty, and how they can be addressed in the near future.
description: Accepted for publication in MNRAS
Transport of interacting electrons through a potential barrier: nonperturbative RG approach
Creators: name: Aristov, D. N.
name: Woelfle, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We calculate the linear response conductance of electrons in a Luttinger liquid with arbitrary interaction g_2, and subject to a potential barrier of arbitrary strength, as a function of temperature. We first map the Hamiltonian in the basis of scattering states into an effective low energy Hamiltonian in current algebra form. Analyzing the perturbation theory in the fermionic representation the diagrams contributing to the renormalization group (RG) β-function are identified. A universal part of the β-function is given by a ladder series and summed to all orders in g_2. First non-universal corrections beyond the ladder series are discussed. The RG-equation for the temperature dependent conductance is solved analytically. Our result agrees with known limiting cases.
description: 6 pages, 5 figures
Campodea (Monocampa) emeryi subsp. emeryi emeryi Silvestri 1912
Creators: name: Sendra, Alberto
name: Reboleira, Ana Sofia P. S.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplura
Campodeidae
Campodea
Campodea emeryi
Campodea (monocampa) emeryi emeryi silvestri, 1912

description: Campodea (Monocampa) emeryi emeryi Silvestri, 1912
Table 3
Campodea (Monocampa) emeryi emeryi Silvestri, 1912: 137, figs XXIII–XXIV.
Diagnosis (Silvestri 1912; Condé 1978a; Bareth 1980)
Body length 1.3–4.1 mm; epicuticle with microdenticles; short, smooth clothing setae; antennae with 19–24 antennomeres; sensillum of third antennomere in dorsal position; long, barbed notal macrosetae; slightly thin pine cone marginal setae with long barbs and slightly longer than clothing setae; smooth subapical setae of tarsus; 1+1 lp macrosetae on VI–VII urotergites, 3+3 lp on VIII urotergite and 5+5 lp IX abdominal segment; cerci shorter than body with 10 articles covered in long macrosetae with barbs and a few clothing setae (latero-interior macrosetae slightly swollen in Corsican specimens); small spermatozoid fascicles, 33–36 μm in diameter and 10 μm wide, spiral filament with 1.5–2 spirals, 93–150 μm long and 1 μm diameter.
Taxonomic notes
Condé (1947e, 1978a) used the ratio between la mesonotal length macrosetae and the separation of their basis (ε) to propose subspecies. The study of 20 specimens from Sardinia Island (Supplementary file 2) shows that the la /ε length ratio is variable during the growth, consequently it has no solid taxonomic value (Table 3).
description: Published as part of Sendra, Alberto & Reboleira, Ana Sofia P. S., 2020, Euro-Mediterranean fauna of Campodeinae (Campodeidae, Diplura), pp. 1-130 in European Journal of Taxonomy 728 on page 81, DOI: 10.5852/ejt.2020.728.1181, http://zenodo.org/record/4316883
Fast and simple characterization of a photon pair source
Creators: name: Bussieres, Felix
name: Slater, Joshua A.
name: Godbout, Nicolas
name: Tittel, Wolfgang
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present an exact model of the detection statistics of a probabilistic source of photon pairs from which a fast, simple and precise method to measure the source's brightness and photon channel transmissions is demonstrated. We measure such properties for a source based on spontaneous parametric downconversion in a periodically poled LiNbO$_3$ crystal producing pairs at 810 and 1550 nm wavelengths. We further validate the model by comparing the predicted and measured values for the $g^{(2)}(0)$ of a heralded single photon source over a wide range of the brightness. Our model is of particular use for monitoring and tuning the brightness on demand as required for various quantum communication applications. We comment on its applicability to sources involving spectral and/or spatial filtering.
description: 10 pages, 5 figures. Published version
LES3: Learning-based Exact Set Similarity Search
Creators: name: Li, Yifan
name: Yu, Xiaohui
name: Koudas, Nick
Publisher: name: arXiv
Year: 2021
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: Set similarity search is a problem of central interest to a wide variety of applications such as data cleaning and web search. Past approaches on set similarity search utilize either heavy indexing structures, incurring large search costs or indexes that produce large candidate sets. In this paper, we design a learning-based exact set similarity search approach, LES3. Our approach first partitions sets into groups, and then utilizes a light-weight bitmap-like indexing structure, called token-group matrix (TGM), to organize groups and prune out candidates given a query set. In order to optimize pruning using the TGM, we analytically investigate the optimal partitioning strategy under certain distributional assumptions. Using these results, we then design a learning-based partitioning approach called L2P and an associated data representation encoding, PTR, to identify the partitions. We conduct extensive experiments on real and synthetic datasets to fully study LES3, establishing the effectiveness and superiority over other applicable approaches.
description: Accepted by VLDB2021
Covid-19: A Zoonosis Related to Deforestation and Foodborne Disease
Creators: name: Fawzi, Nurul Ihsan
name: Qurani, Ika Zahara
name: Annisa Noyara Rahmasary
name: Sihombing, Maic
Publisher: name: figshare
Year: 2021
Subjects: subject: 50211 Wildlife and Habitat Management
subject: FOS: Earth and related environmental sciences
subject: 40604 Natural Hazards
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Engineering
subject: 110804 Medical Virology
subject: FOS: Health sciences

description: The complex interaction between deforestation, land-use changes, and the social economy has increased the human contact with a pathogen that leads to zoonoses. Fragmentation of forest landscape and disturbance of forest structure will increase the number of hosts or vectors that move into the human population. Most importantly, it allows the pathogen to persist indefinitely and the disease to become endemic or even pandemic. Reducing animal-human contact is a big challenge as it requires dramatic behavioral change and support from the government, wildlife experts, epidemiologist, and social scientists.
Canonical forms, higher rank numerical range, convexity, totally isotropic subspace, matrix equations
Creators: name: Li, Chi-Kwong
name: Sze, Nung-Sing
Publisher: name: arXiv
Year: 2007
Subjects: subject: Functional Analysis (math.FA)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 15A21, 15A24, 15A60, 15A90, 81P68

description: Results on matrix canonical forms are used to give a complete description of the higher rank numerical range of matrices arising from the study of quantum error correction. It is shown that the set can be obtained as the intersection of closed half planes (of complex numbers). As a result, it is always a convex set in $\mathcal C$. Moreover, the higher rank numerical range of a normal matrix is a convex polygon determined by the eigenvalues. These two consequences confirm the conjectures of Choi et al. on the subject. In addition, the results are used to derive a formula for the optimal upper bound for the dimension of a totally isotropic subspace of a square matrix, and verify the solvability of certain matrix equations.
description: 10 pages. To appear in Proceedings of the American Mathematical Society
Low-temperature magnetic ordering in SrEr$_2$O$_4$
Creators: name: Petrenko, O. A.
name: Balakrishnan, G.
name: Wilson, N. R.
name: de Brion, S.
name: Suard, E.
name: Chapon, L. C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: SrEr$_2$O$_4$ has been characterised by low-temperature powder neutron diffraction, as well as single crystal specific heat and magnetisation measurements. Magnetisation measurements show that the magnetic system is highly anisotropic at temperature above ordering. A magnetic field of 280 kOe applied at $T=1.6$ K does not overcome the anisotropic magnetisation and fails to fully saturate the system. Long range antiferromagnetic ordering develops below $T_N=0.75$ K, identified by magnetic Bragg reflections with propagation vector ${\bf k}=0$ and a lambda anomaly in the specific heat. The magnetic structure consists of ferromagnetic chains running along the \textit{c} axis, two adjacent chains being stacked antiferromagnetically. The moments point along the \textit{c} direction, but only one of the two crystallographically in-equivalent Er sites has a sizeable ordered magnetic moment, 4.5 $\rm μ_B$ at 0.55 K. The magnetic properties of SrEr$_2$O$_4$ are discussed in terms of the interplay between the low-dimensionality, competing exchange interactions, dipolar interactions and low lying crystal field levels.
description: 6 pages, 7 figures
TJF-Brief-May-2020 Covid-19: A Zoonosis Related to Deforestation and Foodborne Disease
Creators: name: Fawzi, Nurul Ihsan
name: Qurani, Ika Zahara
name: Annisa Noyara Rahmasary
name: Sihombing, Maic
Publisher: name: figshare
Year: 2020
Subjects: subject: 50211 Wildlife and Habitat Management
subject: FOS: Earth and related environmental sciences
subject: 40604 Natural Hazards
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Engineering
subject: 110804 Medical Virology
subject: FOS: Health sciences

description: The complex interaction between deforestation, land-use changes, and the social economy has increased the human contact with a pathogen that leads to zoonoses. Fragmentation of forest landscape and disturbance of forest structure will increase the number of hosts or vectors that move into the human population. Most importantly, it allows the pathogen to persist indefinitely and the disease to become endemic or even pandemic. Reducing animal-human contact is a big challenge as it requires dramatic behavioral change and support from the government, wildlife experts, epidemiologist, and social scientists.
Torque-free manipulation of nanoparticle rotations via embedded spins
Creators: name: Ma, Yue
name: Kim, M. S.
name: Stickler, Benjamin A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Spin angular momentum and mechanical rotation both contribute to the total angular momentum of rigid bodies, leading to spin-rotational coupling via the Einstein-de Haas and Barnett effects. Here we show that the revolutions of symmetric nanorotors can be strongly affected by a small number of intrinsic spins. The resulting dynamics are observable with freely rotating nanodiamonds with embedded nitrogen-vacancy centers and persist for realistically-shaped near-symmetric particles, opening the door to torque-free schemes to control their rotations at the quantum level.
description: 7 pages, 3 figures
Resource allocation in a regional structure for the B.C. Ministry of Health
Creators: name: Kaminsky, Barbara Anne
Publisher: name: University of British Columbia
Year: 2010

description: One of the many aspects involved in planning for regionalization in the B.C. Health Ministry is the development of a method of resource allocation to the regions. This study describes a number of alternative approaches to resource allocation and organizes them according to their type and degree of planning rationality. Four major types of rationality are identified: extension of the status quo, epidemiological, management and economic. Two recommendations — a short-range and a long-range approach — are made to the Health Ministry. In the next several years, it is suggested that the principle of per capita allocations to the regions be adopted. Coincident with this strategy should also be the development of a longer-range approach. An "epidemiological plus" method, using the equivalent of the economist's GNP, is recommended. These recommendations, while based in part upon rational decision-making principles, are inextricably connected to one's values. Therefore, recommendations made in this study need not be acceptable to the various parties involved in the B.C. health care system. A major aspect to the implementation of any resource allocation method is the manner in which it is developed; A consultative approach involving the B.C. Health Ministry and service providers is advocated. For the sake of providing a specific application of implementation strategies, the per capita method is discussed with particular reference to anticipation of problems, dealing with these problems, and the timing and phasing of change. The implications of epidemiologically based resource allocation methods are discussed, both as regards the health care system as well as other government services.
Delocalization of non-Hermitian Quantum Walk on Random Media in One Dimension
Creators: name: Hatano, Naomichi
name: Obuse, Hideaki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Delocalization transition is numerically found in a non-Hermitian extension of a discrete-time quantum walk on a one-dimensional random medium. At the transition, an eigenvector gets delocalized and at the same time the corresponding energy eigenvalue (the imaginary unit times the phase of the eigenvalue of the time-evolution operator) becomes complex. This is in accordance with a non-Hermitian extension of the random Anderson model in one dimension, called, the Hatano-Nelson model. We thereby numerically find that all eigenstates of the Hermitian quantum walk share a common localization length.
description: 23 pages, 7 figures, submitted to the Localisation 2020 proceedings section of Annals of Physics
A geometric recipe for twisted superpotentials
Creators: name: Hollands, Lotte
name: Rüter, Philipp
name: Szabo, Richard J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We give a pedagogical introduction to spectral networks and abelianization, as well as their relevance to $\mathcal{N}=2$ supersymmetric field theories in four dimensions. Motivated by a conjecture of Nekrasov-Rosly-Shatashvili, we detail a geometric recipe for computing the effective twisted superpotential for $\mathcal{N}=2$ field theories of class $\mathcal{S}$ as a generating function of the brane of opers, with respect to the spectral coordinates found from abelianization. We present two new examples, the simplest Argyres-Douglas theory and the pure $SU(2)$ gauge theory, while we conjecture the $ε$-expansion of the effective twisted superpotential for the $E_6$ Minahan-Nemeschansky theory.
description: 102 pages, 42 figures; v2: references added
Nonlocal Special Relativity
Creators: name: Mashhoon, Bahram
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the special theory of relativity, Lorentz invariance is extended in Minkowski spacetime from ideal inertial observers to actual observers by means of the hypothesis of locality, which postulates that accelerated observers are always pointwise inertial. A critical examination of the locality assumption reveals its domain of validity: it is true for pointwise coincidences, but is in conflict with wave-particle duality. To remedy this situation, a nonlocal theory of accelerated systems is presented that reduces to the standard theory in the limit of small accelerations. Some of the main consequences of nonlocal special relativity are briefly outlined.
description: 35 pages, invited paper to appear in the Minkowski issue of Annalen der Physik
Efficient and Robust Secure Aggregation for Sensor Networks
Creators: name: Haghani, P.
name: Papadimitratos, P.
name: Poturalski, M.
name: Aberer, K.
name: Hubaux, J. -P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Cryptography and Security (cs.CR)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Wireless Sensor Networks (WSNs) rely on in-network aggregation for efficiency, however, this comes at a price: A single adversary can severely influence the outcome by contributing an arbitrary partial aggregate value. Secure in-network aggregation can detect such manipulation. But as long as such faults persist, no aggregation result can be obtained. In contrast, the collection of individual sensor node values is robust and solves the problem of availability, yet in an inefficient way. Our work seeks to bridge this gap in secure data collection: We propose a system that enhances availability with an efficiency close to that of in-network aggregation. To achieve this, our scheme relies on costly operations to localize and exclude nodes that manipulate the aggregation, but \emph{only} when a failure is detected. The detection of aggregation disruptions and the removal of faulty nodes provides robustness. At the same time, after removing faulty nodes, the WSN can enjoy low cost (secure) aggregation. Thus, the high exclusion cost is amortized, and efficiency increases.
Development of a FPGA based PCI-express to optical link interface card, KINPEX
Creators: name: Minami, S.
name: Hoffmann, J.
name: Kurz, N.
name: Ott, W.
name: Voltz, S.
Publisher: name: GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
Year: 2014
Subjects: Physics

description: GSI Scientific Report 2013 - GSI Report 2014-1
Gamified BPMN Experiment - Replication Package
Creators: name: Garaccione, Giacomo
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 461202
subject: Empirical software engineering
classificationCode: 461205
subject: Requirements engineering
classificationCode: 461299
subject: Software engineering not elsewhere classified

description: The following resource contains the replication package for the analysis of the results of the experiment described in the paper Gamification of Business Process Modeling Education: An Experimental Analysis submitted to the journal Software and Systems Modeling. The resource contains the following files:
Gamified BPMN Experiment.xlsx An Excel file that contains the results of the analysis of the diagrams produced by the participants of the experiment, the answers to the questionnaire, the distribution of the topics in the answers to the open questions, and the analysis of face and content validity.Gamified BPMN Experiment.rmd An RMarkdown file used to execute the statistical analysis and the analysis of the answers to the questionnaire. Gamified BPMN Experiment.zip A compressed folder that contains all the diagrams produced by the participants that have been analyzed.
Scalable Molecular GW Calculations: Valence and Core Spectra
Creators: name: Mejia-Rodriguez, Daniel
name: Kunitsa, Alexander
name: Aprà, Edoardo
name: Govind, Niranjan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We present a scalable implementation of the $GW$ approximation using Gaussian atomic orbitals to study the valence and core ionization spectroscopies of molecules. The implementation of the standard spectral decomposition approach to the screened Coulomb interaction, as well as a contour deformation method are described. We have implemented both of these approaches using the robust variational fitting approximation to the four-center electron repulsion integrals. We have utilized the MINRES solver with the contour deformation approach to reduce the computational scaling by one order of magnitude. A complex heuristic in the quasiparticle equation solver further allows a speed-up of the computation of core and semi-core ionization energies. Benchmark tests using the GW100 and CORE65 datasets and the carbon 1{\it s} binding energy of the well-studied ethyl trifluoroacetate, or ESCA molecule, were performed to validate the accuracy of our implementation. We also demonstrate and discuss the parallel performance and computational scaling of our implementation using a range of water clusters of increasing size.
description: 39 pages, 9 figures
Modeling Heavy Ion Collisions in AdS/CFT
Creators: name: Albacete, Javier L.
name: Kovchegov, Yuri V.
name: Taliotis, Anastasios
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We construct a model of high energy heavy ion collisions as two ultrarelativistic shock waves colliding in AdS_5. We point out that shock waves corresponding to physical energy-momentum tensors of the nuclei completely stop almost immediately after the collision in AdS_5, which, on the field theory side, corresponds to complete nuclear stopping due to strong coupling effects, likely leading to Landau hydrodynamics. Since in real-life heavy ion collisions the large Bjorken x part of nuclear wave functions continues to move along the light cone trajectories of the incoming nuclei leaving the small-x partons behind, we conclude that a pure large coupling approach is not likely to adequately model nuclear collisions. We show that to account for small-coupling effects one can model the colliding nuclei by two (unphysical) ultrarelativistic shock waves with zero net energy each (but with non-zero energy density). We use this model to study the energy density of the strongly-coupled matter created immediately after the collision. We argue that expansion of the energy density in the powers of proper time squared corresponds on the gravity side to a perturbative expansion of the metric in graviton exchanges. Using such expansion we reproduce our earlier result that the energy density of produced matter at mid-rapidity starts out as a constant (of time) in heavy ion collisions at large coupling.
description: 34 pages, 3 figures. One sentence modified and Appendix B revised
Probing phase transitions in non-Hermitian systems with Multiple Quantum Coherences
Creators: name: Pires, Diego Paiva
name: Macrì, Tommaso
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Understanding the interplay between quantum coherence and non-Hermitian features would enable the devising of quantum technologies based on dissipative systems. In turn, quantum coherence can be characterized in terms of the language of multiple quantum coherences (MQCs) originally developed in solid-state nuclear magnetic resonance (NMR), nowadays applied to the detection of quantum chaos, and to the study of criticality in many-body quantum systems. Here we show the usefulness of MQCs for probing equilibrium phase transitions in non-Hermitian systems. To do so, we investigate the connection of quantum coherences and critical points for several paradigmatic non-Hermitian Hamiltonians. For a non-Hermitian two-level system, MQCs witness the parity-symmetry breaking phase transition from the unbroken to the broken phase. Furthermore, for the non-Hermitian transverse field Ising model, MQCs capture the Yang-Lee phase transition in which the ground state energy acquires a nonzero imaginary component. For the disordered Hatano-Nelson (HN) model with periodic boundary conditions, MQCs testify the emergence of mobility edges in the spectrum of this model. In addition, MQCs signal the topological phase transition exhibited by the complex energy spectra of the disorder-free HN model. Finally, we comment on experimentally probing phase transitions in NMR systems realizing non-Hermitian Hamiltonians. Our results have applications to non-Hermitian quantum sensing, quantum thermodynamics, and in the study of the non-Hermitian skin effect.
description: 13 pages, 8 figures. Close to published version
Cooper pair turbulence in atomic Fermi gases
Creators: name: Dzero, M.
name: Yuzbashyan, E. A.
name: Altshuler, B. L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We investigate the stability of spatially uniform solutions for the collisionless dynamics of a fermionic superfluid. We demonstrate that, if the system size is larger than the superfluid coherence length, the solution characterized by a periodic in time order parameter is unstable with respect to spatial fluctuations. The instability is due to the parametric excitations of pairing modes with opposite momenta. The growth of spatial modulations is suppressed by nonlinear effects resulting in a state characterized by a random superposition of wave packets of the superfluid order parameter. We suggest that this state can be probed by spectroscopic noise measurements.
description: 4 pages, 2 figures
Condition for the higher rank numerical range to be non-empty
Creators: name: Li, Chi-Kwong
name: Poon, Yiu-Tung
name: Sze, Nung-Sing
Publisher: name: arXiv
Year: 2007
Subjects: subject: Functional Analysis (math.FA)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 15A21, 15A24, 15A60, 15A90, 81P68

description: It is shown that the rank-$k$ numerical range of every $n$-by-$n$ complex matrix is non-empty if $n \ge 3k - 2$. The proof is based on a recent characterization of the rank-$k$ numerical range by Li and Sze, the Helly's theorem on compact convex sets, and some eigenvalue inequalities. In particular, the result implies that $Λ_2(A)$ is non-empty if $n \ge 4$. This confirms a conjecture of Choi et al. If $3k-2>n>0$, an $n$-by-$n$ complex matrix is given for which the rank-$k$ numerical range is empty. Extension of the result to bounded linear operators acting on an infinite dimensional Hilbert space is also discussed.
description: 4 pages; to appear in LAMA
The negative impact of cadmium on nitrogen transformation processes in a paddy soil is greater under non-flooding than flooding conditions
Creators: name: Afzal, Muhammad
name: Mengjie Yu
name: Caixian Tang
name: Lujun Zhang
name: Niaz Muhammad
name: Haochun Zhao
name: Jiayin Feng
name: Yu, Lu
name: Jianming Xu
Publisher: name: La Trobe
Year: 2021
Subjects: Uncategorized

description: © 2019 The Authors Nitrification and denitrification are two important processes in the nitrogen (N) cycle. Under heavy-metal pollution with water management of paddy soils, these two processes are not well understood. This study aimed to examine the effect of cadmium (Cd) on N transformation under flooding and non-flooding conditions. A paddy soil was incubated under two water regimes (flooding and non-flooding) and four Cd levels (0, 2, 5 and 10 mg kg−1). The availability of Cd was higher in the non-flooding than flooding conditions. Cadmium contamination significantly (p ≤ 0.05) decreased the copy number of archaeal and bacterial amoA genes, bacterial nirS, nirK and nosZ genes under both conditions with the decrease being greater under non-flooding. High level of Cd (10 mg kg−1) was more toxic in non-flooding than flooding conditions to the nitrifiers and denitrifiers, which in turn decreased N transformation through microbially-mediated processes. Its contamination decreased N2O emission initially under both water regimes but the effect was greater under the non-flooding condition. However, the non-significant stimulatory effect of Cd on N2O emission was observed during the late phase. The microbial community structure was changed with time and water regimes. Irrespective of water regime, the dominated fungal phyla were Ascomycota and Basidiomycota while the dominated bacteria phyla were Actinobacteria, Proteobacteria, Firmicutes and Acidobacteria. In summary, water regimes and Cd bioavailability changed soil N transformations via microbial mediated processes.
Asymptotic Symmetry of Four Dimensional Einstein-Yang-Mills and Einstein-Maxwell Theory
Creators: name: Banerjee, Nabamita
name: Rahnuma, Tabasum
name: Singh, Ranveer Kumar
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Asymptotic symmetry plays an important role in determining physical observables of a theory. Recently, in the context of four dimensional asymptotically flat pure gravity and $\mathcal{N}=1$ supergravity, it has been proposed that OPEs of appropriate celestial amplitudes can be used to find their asymptotic symmetries. In this paper we find the asymptotic symmetry algebras of four dimensional Einstein-Yang-Mills and Einstein-Maxwell theories using this alternative approach, namely using the OPEs of their respective celestial amplitudes. The algebra obtained here are in agreement with the known results in the literature.
description: 28 pages + appendices + references