cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Chiral coupled channel dynamics of the Lambda(1520) and the K-P -> pi0 pi0 Lambda reaction
Creators: name: Sarkar, Sourav
name: Oset, E.
name: Vacas, M. J. Vicente
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the $Λ(1520)D_{03}$ in a chiral coupled channel approach. This resonance appears as dynamically generated from the interaction of the decuplet of baryons and the octet of mesons in s-wave, and its treatment is improved here with the phenomenological inclusion of the $\bar{K} N$ and $πΣ$ channels in d-wave. Since the most important building block in the $Λ(1520)$ is the $π\Sgs(1385)P_{13}$ channel, we study the $K^- p \to π\Sgs(1385) (π^0 Λ)$ reaction in the region of the $Λ(1520)$ and above, and compare the results with recent experimental data. With the coupling of the $Λ(1520)$ to the $π\Sgs$ channel predicted by the theory we find a cross section in good agreement with the data and there is as well agreement for the invariant mass distributions which show a neat peak for the $\Sgs(1385)$ in the $(π^0 Λ)$ spectrum. Predictions are made of a strong $Λ(1520)$ resonant peak of the cross section, as a function of the $K^-$ momentum, in the region below the measured data which, if confirmed experimentally, would give a stronger support to the idea of the $Λ(1520)$ as a dynamically generated resonance.
From Fischer projections to quantum mechanics of tetrahedral molecules: new perspectives in chirality
Creators: name: Capozziello, S.
name: Lattanzi, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The algebraic structure of central molecular chirality can be achieved starting from the geometrical representation of bonds of tetrahedral molecules, as complex numbers in polar form, and the empirical Fischer projections used in organic chemistry. A general orthogonal O(4) algebra is derived from which we obtain a chirality index related to the classification of a molecule as achiral, diastereoisomer or enantiomer. Consequently, the chiral features of tetrahedral chains can be predicted by means of a molecular Aufbau. Moreover, a consistent Schroedinger equation is developed, whose solutions are the bonds of tetrahedral molecules in complex number representation. Starting from this result, the O(4) algebra can be considered as a quantum chiral algebra. It is shown that the operators of such an algebra preserve the parity of the whole system.
description: 33 pages, to appear in Adv. Quantum Chem
Resonant two-photon excitation of 1s paraexcitons in Cuprous Oxide
Creators: name: Liu, Yingmei
name: Snoke, David
Publisher: name: arXiv
Year: 2004
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We have created paraexcitons in Cuprous Oxide via resonant two-photon generation, and examined their population dynamics by means of time-correlated single photon detection. Confining the excitons to a constant volume in a harmonic potential trap made with inhomogeneous applied stress along the [001] axis, we find that paraexcitons are created directly, and orthoexcitons appear primarily through the well-known excitonic Auger process. Hot excitons are also created via a three-photon process when the IR laser is non-resonant. Also we generate excitons with two colliding pulses, and the luminescence is weaker than that from one beam excitation with same total laser power. These results show that resonant one-beam two-photon generation of paraexcitons is a promising way to pursue Bose-Einstein condensation of paraexcitons.
description: 22 pages, 9 figures
Global properties of charged dilatonic Gauss-Bonnet black holes
Creators: name: Melis, M.
name: Mignemi, S.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the phase space of the spherically symmetric solutions of Einstein-Maxwell-Gauss-Bonnet system nonminimally coupled to a scalar field and prove the existence of solutions with unusual asymptotics in addition to asymptotically flat ones. We also find new dyonic solutions of dilatonic Einstein-Maxwell theory.
description: 10 pages, plain TeX
g-C3N4.5 nanosheets by a hard template nanocasting approach for sustainable visible-light hydrogen evolution with prominent quantum efficiency
Creators: name: Sasanka Deka
Publisher: name: figshare
Year: 2020
Subjects: subject: 30601 Catalysis and Mechanisms of Reactions
subject: FOS: Chemical sciences
subject: 30301 Chemical Characterisation of Materials
subject: Inorganic Chemistry
subject: 30302 Nanochemistry and Supramolecular Chemistry
subject: 30306 Synthesis of Materials

description: It is desirable yet challenging to synthesize a highly ordered holey carbon nitride material with excess nitrogen atoms for a sustainable solar H2 evolution. Herein, we report the development of directed highly ordered nitrogen-rich honeycomb-like mesoporous carbon nitride nanosheets by using a novel synthetic approach for this purpose. The unique formation route, surface structure and charge carrier dynamics of the two dimensional holey nanosheets are comprehensively monitored and confirmed by SAXS, HRTEM, AFM, BET, XPS and TRPL analyses. Non-stoichiometric high nitrogen content mesoporous nanosheets with the final stoichiometry of g-C3N4.5 acquiring a high specific surface area (382 m2 g−1), remarkable pore size (7.2 nm) and sheet thickness ∼5–6 nm are realized in this first report. This elegant material possesses unique low band-gap energy (2.42 eV). Remarkably, the as-synthesized g-C3N4.5 NSs exhibit a record high photocatalytic H2 evolution rate of 8180 μmol g−1 h−1 under the present light irradiation (420 ≤ λ ≤ 510 nm) condition. The apparent quantum efficiency is found to be as high as 27.14% at 420 nm and retains its photocatalytic activity for longer consecutive catalytic cycles.
Pivot calibration concept for sensor attached mobile c-arms
Creators: name: Lee, Sing Chun
name: Seibold, Matthias
name: Fürnstahl, Philipp
name: Farshad, Mazda
name: Navab, Nassir
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Medical augmented reality has been actively studied for decades and many methods have been proposed torevolutionize clinical procedures. One example is the camera augmented mobile C-arm (CAMC), which providesa real-time video augmentation onto medical images by rigidly mounting and calibrating a camera to the imagingdevice. Since then, several CAMC variations have been suggested by calibrating 2D/3D cameras, trackers, andmore recently a Microsoft HoloLens to the C-arm. Different calibration methods have been applied to establishthe correspondence between the rigidly attached sensor and the imaging device. A crucial step for these methodsis the acquisition of X-Ray images or 3D reconstruction volumes; therefore, requiring the emission of ionizingradiation. In this work, we analyze the mechanical motion of the device and propose an alternatative methodto calibrate sensors to the C-arm without emitting any radiation. Given a sensor is rigidly attached to thedevice, we introduce an extended pivot calibration concept to compute the fixed translation from the sensor tothe C-arm rotation center. The fixed relationship between the sensor and rotation center can be formulated as apivot calibration problem with the pivot point moving on a locus. Our method exploits the rigid C-arm motiondescribing a Torus surface to solve this calibration problem. We explain the geometry of the C-arm motion andits relation to the attached sensor, propose a calibration algorithm and show its robustness against noise, as wellas trajectory and observed pose density by computer simulations. We discuss this geometric-based formulationand its potential extensions to different C-arm applications.
description: Accepted for Image-Guided Procedures, Robotic Interventions, and Modeling 2020, Houston, TX, USA
From Sensor to Processing Networks: Optimal Estimation with Computation and Communication Latency
Creators: name: Ballotta, Luca
name: Schenato, Luca
name: Carlone, Luca
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optimization and Control (math.OC)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Multiagent Systems (cs.MA)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 93C99 (Primary), 93E99 (Secondary)

description: This paper investigates the use of a networked system ($e.g.$, swarm of robots, smart grid, sensor network) to monitor a time-varying phenomenon of interest in the presence of communication and computation latency. Recent advances in edge computing have enabled processing to be spread across the network, hence we investigate the fundamental computation-communication trade-off, arising when a sensor has to decide whether to transmit raw data (incurring communication delay) or preprocess them (incurring computational delay) in order to compute an accurate estimate of the state of the phenomenon of interest. We propose two key contributions. First, we formalize the notion of $processing$ $network$. Contrarily to $sensor$ $and$ $communication$ $networks$, where the designer is concerned with the design of a suitable communication policy, in a processing network one can also control when and where the computation occurs in the network. The second contribution is to provide analytical results on the optimal preprocessing delay ($i.e.$, the optimal time spent on computations at each sensor) for the case with a single sensor and multiple homogeneous sensors. Numerical results substantiate our claims that accounting for computation latencies (both at sensor and estimator side) and communication delays can largely impact the estimation accuracy.
description: 8 pages, 8 figures To be published in Proceedings of IFAC 2020 World Congress. arXiv admin note: substantial text overlap with arXiv:1911.05859
Controllable plasma energy bands in a 1D crystal of fractional Josephson vortices
Creators: name: Susanto, H.
name: Goldobin, E.
name: Koelle, D.
name: Kleiner, R.
name: van Gils, S. A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We consider a 1D chain of fractional vortices in a long Josephson junction with alternating $\pmκ$ phase discontinuities. Since each vortex has its own eigenfrequency, the inter-vortex coupling results in eigenmode splitting and in the formation of an oscillatory energy band for plasma waves. The band structure can be controlled at the design time by choosing the distance between vortices or \emph{during experiment} by varying the topological charge of vortices or the bias current. Thus one can construct an artificial vortex crystal with controllable energy bands for plasmons.
description: 4 pages, 2 Figs
The smooth classification of 4-dimensional complete intersections
Creators: name: Crowley, Diarmuid
name: Nagy, Csaba
Publisher: name: arXiv
Year: 2020
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57R65, 57R55, 14M10

description: We prove the "Sullivan Conjecture" on the classification of 4-dimensional complete intersections up to diffeomorphism. Here an $n$-dimensional complete intersection is a smooth complex variety formed by the transverse intersection of $k$ hypersurfaces in $CP^{n+k}$.
 Previously Kreck and Traving proved the 4-dimensional Sullivan Conjecture when 64 divides the total degree (the product of the degrees of the defining hypersurfaces) and Fang and Klaus proved that the conjecture holds up to the action of the group of homotopy 8-spheres $Θ_8 = Z/2$.
 Our proof involves several new ideas, including the use of the Hambleton-Madsen theory of degree-$d$ normal maps, which provide a fresh perspective on the Sullivan Conjecture in all dimensions. This leads to an unexpected connection between the Segal Conjecture for $S^1$ and the Sullivan Conjecture.
description: Significant changes made in response to successive referee's reports: these include the addition of Section 2.1, a new proof of Lemma 4.1, the addition of Lemma 5.13 and the adoption of an oriented version of the Hambleton-Madsen theory of degree-d normal maps. 29 pages
Dinera ferina
Creators: name: Schlüsslmayr, Gerhard
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tachinidae
Dinera
Dinera ferina

description: Dinera ferina (FALLÉN, 1817)
Bgld, St. Georgen b. Eisenstadt, Hetscherlberg, 22.5.17.
Neu für Burgenland.
description: Published as part of Schlüsslmayr, Gerhard, 2018, Erstnachweise von Fliegen (Diptera) für Österreich und einige Bundesländer, pp. 765-800 in Linzer biologische Beiträge 50 (1) on page 794, DOI: 10.5281/zenodo.4004374
The Maslov index and nondegenerate singularities of integrable systems
Creators: name: Foxman, JA
name: Robbins, JM
Publisher: name: arXiv
Year: 2004
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 37J35; 81S10; 81S30

description: We consider integrable Hamiltonian systems in R^{2n} with integrals of motion F = (F_1,...,F_n) in involution. Nondegenerate singularities are critical points of F where rank dF = n-1 and which have definite linear stability. The set of nondegenerate singularities is a codimension-two symplectic submanifold invariant under the flow. We show that the Maslov index of a closed curve is a sum of contributions +/- 2 from the nondegenerate singularities it is encloses, the sign depending on the local orientation and stability at the singularities. For one-freedom systems this corresponds to the well-known formula for the Poincaré index of a closed curve as the oriented difference between the number of elliptic and hyperbolic fixed points enclosed. We also obtain a formula for the Liapunov exponent of invariant (n-1)-dimensional tori in the nondegenerate singular set. Examples include rotationally symmetric n-freedom Hamiltonians, while an application to the periodic Toda chain is described in a companion paper.
description: 27 pages, 1 figure; published version
The Impact of Biofuels Policy on Agribusiness Stock Prices
Creators: name: Tepe, Fatma Sine
name: Du, Xiaodong
name: Hennessy, David A.
name: Tepe, Fatma Sine
name: Du, Xiaodong
name: Hennessy, David A.
Publisher: name: Unknown
Year: 2009
Subjects: subject: Agribusiness
subject: Demand and Price Analysis
subject: Resource /Energy Economics and Policy
subject: biofuels policy
subject: excess stock returns
subject: GARCH effect
subject: linear factor model

description: Corn markets are important for many industries, including the seed, fertilizer, meat production/processing and agricultural machinery sectors, all of which are highly concentrated. Oligopoly theory suggests that corn input and field equipment suppliers likely benefit from policies that support corn markets, such as U.S. biofuels policy, while meat companies are likely adversely affected. Employing a linear two-factor (S&P 500 and corn prices) equilibrium asset pricing model, this study investigates the impact of biofuels policy on U.S. agribusiness and food processing firm stock prices. Conditional heteroskedasticity in stock returns is accounted for using a GARCH(1,1) model. Corn price increases are found to have positive effects on excess stock returns for seed, fertilizer and machinery companies, while the impact on meat companies is negative. The results may be interpreted as evidence that crop input suppliers gain from U.S. biofuels policy while meat processors lose.
It has to be cool: on supergiant progenitors of binary black hole mergers from common-envelope evolution
Creators: name: Klencki, J.
name: Nelemans, G.
name: Istrate, A. G.
name: Chruslinska, M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Common-envelope (CE) evolution in massive binary systems is thought to be one of the most promising channels for the formation of compact binary mergers. In the case of merging binary black holes (BBHs), the essential CE phase takes place at a stage when the first BH is already formed and the companion star expands as a supergiant. We study which BH binaries with supergiant companions will evolve through and potentially survive a CE phase. To this end, we compute envelope binding energies from detailed massive stellar models at different evolutionary stages and metallicities. We make multiple physically extreme choices of assumptions that favor easier CE ejection as well as account for recent advancements in mass transfer stability criteria. We find that even with the most optimistic assumptions, a successful CE ejection in BH (and also NS) binaries is only possible if the donor is a massive convective-envelope giant, a red supergiant (RSG). In other words, pre-CE progenitors of BBH mergers are BH binaries with RSG companions. We find that due to its influence on the radial expansion of massive giants, metallicity has an indirect but a very strong effect on the envelope structure and binding energies of RSGs. Our results suggest that merger rates from population synthesis models could be severely overestimated, especially at low metallicity. Additionally, the lack of observed RSGs with luminosities above log($L/L_{\odot}$) = 5.6-5.8, corresponding to stars with $M > 40 M_{\odot}$, puts into question the viability of the CE channel for the formation of the most massive BBH mergers. Either such RSGs elude detection due to very short lifetimes, or they do not exist and the CE channel can only produce BBH systems with total mass $< 50 M_{\odot}$. We discuss an alternative CE scenario, in which a partial envelope ejection is followed by a phase of possibly long and stable mass transfer.
description: 20 pages + App., accepted for publication in A&A. For $\lambda_{\rm CE}$ fits, see: https://ftp.science.ru.nl/astro/jklencki/
Quatre nacions suprimidas d'Asia e Oceania
Creators: name: BLANC, Joan Francés
Publisher: name: figshare
Year: 2020
Subjects: subject: 210302 Asian History
subject: FOS: History and archaeology
subject: 210313 Pacific History (excl. New Zealand and Maori)

description: Article on the flags of four suppressed nations.
The Environmental Impact of Supermassive Black Holes
Creators: name: Loeb, Abraham
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The supermassive black holes observed at the centers of almost all present-day galaxies, had a profound impact on their environment. I highlight the principle of self-regulation, by which supermassive black holes grow until they release sufficient energy to unbind the gas that feeds them from their host galaxy. This principle explains several observed facts, including the correlation between the mass of a central black hole and the depth of the gravitational potential well of its host galaxy, and the abundance and clustering properties of bright quasars in the redshift interval of z~2-6. At lower redshifts, quasars might have limited the maximum mass of galaxies through the suppression of cooling flows in X-ray clusters. The seeds of supermassive black holes were likely planted in dwarf galaxies at redshifts z>10, through the collapse of massive or supermassive stars. The minimum seed mass can be identified observationally through the detection of gravitational waves from black hole binaries by Advanced LIGO or LISA. Aside from shaping their host galaxies, quasar outflows filled the intergalactic medium with magnetic fields and heavy elements. Beyond the reach of these outflows, the brightest quasars at z>6 have ionized exceedingly large volumes of gas (tens of comoving Mpc) prior to global reionization, and must have suppressed the faint end of the galaxy luminosity function in these volumes before the same occurred through the rest of the universe.
description: Invited contribution to Proceedings of the Conference on "Growing Black Holes" held in Garching, Germany, on June 21-25, 2004, edited by A. Merloni, S. Nayakshin and R. Sunyaev, Springer-Verlag series of "ESO Astrophysics Symposia"
Dufouria chalybeata
Creators: name: Schlüsslmayr, Gerhard
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tachinidae
Dufouria
Dufouria chalybeata

description: Dufouria chalybeata (MEIGEN, 1824)
Bgld, Weiden, Zitzmannsdorfer Wiesen, 30.5.17, 8 Ex; Jois, Schieferberg, 28.5.17.
Neu für Burgenland.
description: Published as part of Schlüsslmayr, Gerhard, 2018, Erstnachweise von Fliegen (Diptera) für Österreich und einige Bundesländer, pp. 765-800 in Linzer biologische Beiträge 50 (1) on page 794, DOI: 10.5281/zenodo.4004374
Feynman checkers: towards algorithmic quantum theory
Creators: name: Skopenkov, M.
name: Ustinov, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mathematical Physics (math-ph)
subject: Combinatorics (math.CO)
subject: Number Theory (math.NT)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 82B20, 11L03, 68Q12, 81P68, 81T25, 81T40, 05A17, 11P82, 33C45

description: We survey and develop the most elementary model of electron motion introduced by R$.$Feynman. In this game, a checker moves on a checkerboard by simple rules, and we count the turns. Feynman checkers are also known as a one-dimensional quantum walk or an Ising model at imaginary temperature. We solve mathematically a problem by R$.$Feynman from 1965, which was to prove that the discrete model (for large time, small average velocity, and small lattice step) is consistent with the continuum one. We study asymptotic properties of the model (for small lattice step and large time) improving the results by J$.$Narlikar from 1972 and by T$.$Sunada-T$.$Tate from 2012. For the first time we observe and prove concentration of measure in the small-lattice-step limit. We perform the second quantization of the model.
description: in English and in Russian; 54 pages, 17 figures. Changelog: An important reference to Sunada-Tate, 2012, has been added. This has not affected the main results. But some secondary ones have been replaced by the stronger ones from this reference. Minor correction of Example 4 has been performed, and a proof has been added in Section 12.5
Demand for On-Farm Permanent Hired Labor in Family Holdings: A Comment
Creators: name: Kimhi, Ayal
name: Kimhi, Ayal
Publisher: name: Unknown
Year: 2009
Subjects: Community/Rural/Urban Development

description: This comment critically discusses the theoretical and empirical treatment of corner solutions in the analysis of labor decisions on farm households. As more and more labor decisions are analyzed jointly, the more ambitious becomes the theoretical justification of empirical applications. "Cutting corners" in theoretical models puts the validity of empirical conclusions in doubt. In such cases relying on intuitive theoretical justification of empirical modeling is preferred.
Persistent dynamic correlations in self-organized critical systems away from their critical point
Creators: name: Woodard, Ryan
name: Newman, David E.
name: Sánchez, Raúl
name: Carreras, Benjamin A.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We show that correlated dynamics and long time memory persist in self-organized criticality (SOC) systems even when forced away from the defined critical point that exists at vanishing drive strength. These temporal correlations are found for all levels of external forcing as long as the system is not overdriven. They arise from the same physical mechanism that produces the temporal correlations found at the vanishing drive limit, namely the memory of past events stored in the system profile. The existence of these correlations contradicts the notion that a SOC time series is simply a random superposition of events with sizes distributed as a power law, as has been suggested by previous studies.
description: Accepted by Physica A, revised 22 March 2006, available online 26 May 2006 (16 pages, 21 figures)
Africa's Food Crisis: Conditioning Trends and Global Development Policy
Creators: name: Adesina, Akinwumi A.
name: Adesina, Akinwumi A.
Publisher: name: Unknown
Year: 2009
Subjects: Food Security and Poverty

description: African countries continue to face deepening food crises which have been accentuated by the global food, energy and financial crises. This situation is part of a long term structural problem: decades of under-investments in agricultural sector and poor policies of support for smallholder farmers who form the bulk of the farming population. The inability of these farmers to achieve a supply response when commodity prices were high and market access was less of a problem suggests that there are multiple sets of binding constraints that continue to limit the potential of agricultural growth to reduce food security and poverty on the continent. What the continent needs is a smallholder-based green revolution that can help raise agricultural productivity and lift millions out of poverty. Many challenges face the achievement of the green revolution in Africa. This paper reviews some of the historical trends that have hampered the performance of the agriculture sector. In addition, it reviews the impacts of more recent trends including the global financial crisis, public sector investments, inequities in global agricultural development policies, rush for agricultural lands by foreign investors, domestic commercial financing markets, climate change and emerging carbon markets. The paper argues that while opportunities for accelerated growth exists for African agriculture, new sets of policy instruments will be needed to support smallholder farmers to access new agricultural technologies, finance, reduce impacts of climate change and adopt sustainable land use practices that can allow them to benefit from emerging global carbon markets.
Search Result Clustering in Collaborative Sound Collections
Creators: name: Favory, Xavier
name: Font, Frederic
name: Serra, Xavier
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: Human-Computer Interaction (cs.HC)
subject: Machine Learning (cs.LG)
subject: Sound (cs.SD)
subject: FOS: Computer and information sciences
subject: H.3.3

description: The large size of nowadays' online multimedia databases makes retrieving their content a difficult and time-consuming task. Users of online sound collections typically submit search queries that express a broad intent, often making the system return large and unmanageable result sets. Search Result Clustering is a technique that organises search-result content into coherent groups, which allows users to identify useful subsets in their results. Obtaining coherent and distinctive clusters that can be explored with a suitable interface is crucial for making this technique a useful complement of traditional search engines. In our work, we propose a graph-based approach using audio features for clustering diverse sound collections obtained when querying large online databases. We propose an approach to assess the performance of different features at scale, by taking advantage of the metadata associated with each sound. This analysis is complemented with an evaluation using ground-truth labels from manually annotated datasets. We show that using a confidence measure for discarding inconsistent clusters improves the quality of the partitions. After identifying the most appropriate features for clustering, we conduct an experiment with users performing a sound design task, in order to evaluate our approach and its user interface. A qualitative analysis is carried out including usability questionnaires and semi-structured interviews. This provides us with valuable new insights regarding the features that promote efficient interaction with the clusters.
description: 8 pages, 4 figures, Proceedings of the 2020 International Conference on Multimedia Retrieval (ICMR 20), June 8-11, 2020, Dublin, Ireland. ACM, NewYork, NY, USA, 8 pages
Effects of respiratory muscle fatigue on exercise performance in healthy females
Creators: name: Shoemaker, Andrea Paula
Publisher: name: University of British Columbia
Year: 2009

description: The respiratory system has not been traditionally considered a limiting factor in exercise performance however, several studies have demonstrated that respiratory muscle fatigue (RMF) occurs following high-intensity exercise as well as prolonged submaximal exercise. In order to investigate RMF as a limiting factor in exercise performance fatigue was induced in ten healthy female participants (Age = 26.8 ± 2.0 yrs; height = 165.7 ± 4.5 cm; weight = 57.3 ± 7.6 kg; VO2 max 43.3 ± 4.7 mL-kg-1 min-1, range 35.8 to 49.5 mL-kg-1-min-1). Subjects were required to visit the lab on six separate occasions. Three test days served as control conditions where RMF was not induced and baseline measures of spirometry and exercise performance were measured. On the remaining three test days, RMF was induced and the subsequent effects on exercise performance were measured. Maximal test of aerobic capacity was performed on two of the six test days and on the remaining 4 test days participants performed tests of endurance performance. Subjects were instructed to breathe at 70% of their maximal voluntary ventilation (MVV) for 15-minutes to induce RMF. Following induction of RMF exercise performance was measured on an electronically braked cycle ergometer. Ventilation during the hyperpnea task equaled 72 to 75% MVV on the three days that RMF was induced. The induction of RMF did not significantly alter maximal aerobic power (p = 0.111), although, exercise was ceased at a significantly lower peak heart rate (p = 0.002) and peak minute ventilation (p = 0.013). Ratings of perceived exertion for the respiratory muscles muscles were significantly increased following the induction of RMF (p = 0.003). Endurance performance (time to exhaustion) was reduced from 408.0 ± 84.9 seconds to 320.3 ± 71.5 seconds following the induction of RMF (p = 0.002) without any associated changes in VO2, heart rate, or minute ventilation. The reduction seen in endurance performance time supports the hypothesis that a decreased time to exhaustion is seen with the induction of RMF. Maximal oxygen consumption did not decrease and therefore cannot support the hypothesis that VO2max will be reduced following RMF induction. Respiratory muscle fatigue appears to be a limiting factor in exercise performance in healthy females.
ORGANIZATION OF THE PROCESS OF PRODUCTION AND SALES OF AGRICULTURAL PRODUCTS IN AGRICULTURAL CLUSTERS
Creators: name: Janibekov, F.
name: Khudoyberdiyeva, M.U.
name: Isroilov, Lazizbek
Publisher: name: Zenodo
Year: 2025

description: A generalized and expanded definition of a cluster has been developed based on a study of the economic essence of the cluster, the need for its organization and development principles, conditions, and theoretical views.
A Model of Electroweak Symmetry Breaking from a Fifth Dimension
Creators: name: Panico, Giuliano
name: Serone, Marco
name: Wulzer, Andrea
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We reconsider the idea of identifying the Higgs field as the internal component of a gauge field in the flat space R^4XS^1/Z_2, by relaxing the constraint of having unbroken SO(4,1) Lorentz symmetry in the bulk. In this way, we show that the main common problems of previous models of this sort, namely the prediction of a too light Higgs and top mass, as well as of a too low compactification scale, are all solved. We mainly focus our attention on a previously constructed model. We show how, with few minor modifications and by relaxing the requirement of SO(4,1) symmetry, a potentially realistic model can be obtained with a moderate tuning in the parameter space of the theory. In this model, the Higgs potential is stabilized and the hierarchy of fermion masses explained.
description: 28 pages, 15 figures; v2: minor corrections and one reference added; v3: treatment of the anomalous gauge field A_X corrected, one figure added, essential results unchanged
Friction of a slider on a granular layer: Non-monotonic thickness dependence and effect of boundary conditions
Creators: name: Siavoshi, Saloome
name: Orpe, Ashish V.
name: Kudrolli, Arshad
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We investigate the effective friction encountered by a mass sliding on a granular layer as a function of bed thickness and boundary roughness conditions. The observed friction has minima for a small number of layers before it increases and saturates to a value which depends on the roughness of the sliding surface. We use an index-matched interstitial liquid to probe the internal motion of the grains with fluorescence imaging in a regime where the liquid has no significant effect on the measured friction. The shear profiles obtained as a function of depth show decrease in slip near the sliding surface as the layer thickness is increased. We propose that the friction depends on the degree of grain confinement relative to the sliding surfaces.
description: 4 pages, 6 figures
Ectophasia oblonga
Creators: name: Schlüsslmayr, Gerhard
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tachinidae
Ectophasia
Ectophasia oblonga

description: Ectophasia oblonga (ROBINEAU- DESVOIDY, 1830)
NÖ, Hainburg, Spitzerberg, 17.6.01.
Neu für Niederösterreich.
description: Published as part of Schlüsslmayr, Gerhard, 2018, Erstnachweise von Fliegen (Diptera) für Österreich und einige Bundesländer, pp. 765-800 in Linzer biologische Beiträge 50 (1) on page 794, DOI: 10.5281/zenodo.4004374
A Gaussian Thermionic Emission Model for Analysis of Au/MoS2 Schottky Barrier Devices
Creators: name: Wong, Calvin Pei Yu
name: Troadec, Cedric
name: Wee, Andrew T. S.
name: Goh, Kuan Eng Johnson
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Schottky barrier inhomogeneities are expected at the metal/TMDC interface and this can impact device performance. However, it is difficult to account for the distribution of interface inhomogeneity as most techniques average over the spot-area of the analytical tool, or the entire device measured for electrical I-V measurements. Commonly used models to extract Schottky barrier heights (SBH) neglect or fail to account for such inhomogeneities, which can lead to the extraction of incorrect SBH and Richardson constants. Here, we show that a gaussian modified thermionic emission model gives the best fit to experimental I-V-T data of van der Waals Au/p-MoS2 interfaces and allow the deconvolution of the SBH of the defective regions from the pristine region. By the inclusion of a gaussian distributed SBH in the macroscopic I-V-T analysis, we demonstrate that interface inhomogeneities due to defects are deconvoluted and well correlated to the impact on the device behavior across a wide temperature range from room temperature of 300 K down to 120 K. We verified the gaussian thermionic model across two different types of p-MoS2 (geological and synthetic), and finally compared the macroscopic SBH with the results of a nanoscopic technique, ballistic hole emission microscopy (BHEM). The results obtained using BHEM were consistent with the pristine Au/p-MoS2 SBH extracted from the gaussian modified thermionic emission model over hundreds of nanometers. Our findings show that the inclusion of Schottky barrier inhomogeneities in the analysis of I-V-T data is important to elucidate the impact of defects (e.g. grain boundaries, metallic impurities, etc.) and hence their influence on device behavior. We also find that the Richardson constant, a material specific constant typically treated as merely a fitting constant, is an important parameter to check for the validity of the transport model.
description: 36 pages, 10 figures
ADOPTION OF VETERINARY SURGEON SERVICES BY SHEEP AND GOAT FARMERS IN QWAQWA
Creators: name: Nell, Wilhelm T.
name: Van Schalkwyk, Herman D.
name: Sanders, John H.
name: Schwalbach, L.
name: Beste, C.J.
name: Nell, Wilhelm T.
name: Van Schalkwyk, Herman D.
name: Sanders, John H.
name: Schwalbach, L.
name: Beste, C.J.
Publisher: name: Unknown
Year: 1998
Subjects: Livestock Production/Industries

description: A number of technology transfer (diffusion) programmes involving amongst others veterinary surgeon services subsidised by the government, were launched in the former homelands of South Africa between 1980 and 1993. Many of these programmes were discontinued after the general election of 1994. In order to evaluate the adoption of technology in Qwaqwa, a former Sotho speaking homeland, two Logit models were fit using the conventional definition of an adopter and an adapted definition, which included potential adopters with the adopters. Where the conventional definition of adoption was estimated, livestock income per LSU, ram technology, roads and suppliers of livestock inputs are significant variables contributing to adoption. The results of the adapted model reveal that farming efficiency (weaning percentage), type of farmer (sheep as percentage of the total small ruminant herd) and ram technology, prove to be significant variables predicting adoption. It was also found that the characteristics of potential adopters gravitate more to adopters than to non-adopters. These results indicated that the adapted definition presented a more accurate prediction than the conventional definition. The results of this study indicate the policy necessary to further accelerate the diffusion of veterinary surgeon services by means of the development of a better infrastructure, the reintroduction of subsidised veterinary surgeon services at the sheering sheds as well as a better flow of information to farmers in Qwaqwa.
Precessional angular velocity and field strength in the complex octonion space
Creators: name: Weng, Zi-Hua
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences
subject: 83E15, 81R60, 17A35

description: The paper aims to apply the octonions to explore the precessional angular velocities of several particles in the electromagnetic and gravitational fields. Some scholars utilize the octonions to research the electromagnetic and gravitational fields. One formula can be derived from the octonion torque, calculating the precessional angular velocity generated by the gyroscopic torque. When the octonion force is equal to zero, it is able to deduce the force equilibrium equation and precession equilibrium equation and so forth. From the force equilibrium equation, one can infer the angular velocity of revolution for the particles. Meanwhile, from the precession equilibrium equation, it is capable of ascertaining the precessional angular velocity induced by the torque derivative, including the angular velocity of Larmor precession. Especially, some ingredients of torque derivative are in direct proportion to the field strengths. The study reveals that the precessional angular velocity induced by the torque derivative is independent of that generated by the torque. The precessional angular velocity, induced by the torque derivative, is relevant to the torque derivative and the spatial dimension of precessional velocity. It will be of great benefit to understanding further the precessional angular velocity of the spin angular momentum.
Engineering mixed states in a degenerate four-state system
Creators: name: Karpati, Attila
name: Kis, Zsolt
name: Adam, Peter
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A method is proposed for preparing any pure and a wide class of mixed quantum states in the decoherence-free ground-state subspace of a degenerate multilevel lambda system. The scheme is a combination of optical pumping and a series of coherent excitation processes, and for a given pulse sequence the same final state is obtained regardless of the initial state of the system. The method is robust with respect to the fluctuation of the pulse areas, like in adiabatic methods, however, the field amplitude can be adjusted in a larger range.
description: 5 pages, 2 figures
On the Northcott property for special values of L-functions
Creators: name: Pazuki, Fabien
name: Pengo, Riccardo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 11G40, 11G50, 14K05, 11F67

description: We propose an investigation on the Northcott, Bogomolov and Lehmer properties for special values of L-functions. We first introduce an axiomatic approach to these three properties. We then focus on the Northcott property for special values of L-functions. In the case of L-functions of pure motives, we prove a Northcott property for special values located at the left of the critical strip, assuming that the L-functions in question satisfy some expected properties. Inside the critical strip, focusing on the Dedekind zeta function of number fields, we prove that such a property does not hold for the special value at one, but holds for the special value at zero, and we give a related quantitative estimate in this case.
description: 44 pages. Accepted for publication in the Revista Matem\'atica Iberoamericana
Reversible Trapping of Colloids in Microgrooved Channels via Diffusiophoresis under Steady-State Solute Gradients
Creators: name: Singh, Naval
name: Vladisavljević, Goran T.
name: Nadal, François
name: Cottin-Bizonne, Cécile
name: Pirat, Christophe
name: Bolognesi, Guido
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The controlled transport of colloids in dead-end structures is a key capability that can enable a wide range of applications, such as bio-chemical analysis, drug delivery and underground oil recovery. This letter presents a new trapping mechanism that allows the fast (i.e., within a few minutes) and reversible accumulation of sub-micron particles within dead-end micro-grooves by means of parallel streams with different salinity level. For the first time, particle focusing in dead-end structures is achieved under steady-state gradients. Confocal microscopy analysis and numerical investigations show that the particles are trapped at a flow recirculation region within the grooves due to a combination of diffusiophoresis transport and hydrodynamic effects. Counterintuitively, the particle velocity at the focusing point is not vanishing and, hence, the particles are continuously transported in and out of the focusing point. The accumulation process is also reversible and one can cyclically trap and release the colloids by controlling the salt concentration of the streams via a flow switching valve.
description: Manuscript under review. 6 pages, 5 figures + Supplementary Information
Joint effect of lattice interaction and potential fluctuation in colossal magnetoresistive manganites
Creators: name: Gu, R. Y.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Taking into account both the Jahn-Teller lattice distortion and the on-site electronic potential fluctuations in the orbital-degenerated double-exchange model, in which both the core-spin and the lattice distortion are treated classically, we investigate theoretically the metal-insulator transition (MIT) in manganites by considering the electronic localization effect. An inverse matrix method is developed for calculation in which we use the inverse of the transfer matrix to obtain the localization length. We find that within reasonable range of parameters, both the lattice effect and the potential fluctuation are responsible to the occurrence of the MIT. The role of the orbital configuration is also discussed.
description: 4 figures
The media construction of Simon Whitfield : producing a Canadian Olympic champion
Creators: name: Darnell, Simon C.
Publisher: name: University of British Columbia
Year: 2009

description: This thesis analyzes the media coverage and marketing of the Canadian Olympic athlete Simon Whitfield. Whitfield, a 25 year-old from Kingston Ontario, won the first ever gold medal in the Olympic men's triathlon at the 2000 Sydney Games. The victory propelled him to the status of Canadian celebrity and afforded him increased commercial opportunities including corporate sponsorships and product endorsements. This research combined two methodologies: 1) a textual analysis of Canadian media coverage of Whitfield and a keyword search of the coverage, and 2) interviews with five Canadian sports journalists that covered Whitfield and four marketing representatives from companies that sponsored Whitfield or employed him as a product endorser. Whitfield was also interviewed to provide an athlete's perspective on the media production and marketing processes. The results revealed thematic consistencies in the Canadian media coverage of Whitfield, particularly with respect to Canadian national identity, the value of an Olympic gold medal and Whitfield's status as a Canadian hero. These results support previous research that found recurring themes of athletic heroism and myths of Canadian nationalism in the production of Canadian sports media (MacNeill, 1996, Gruneau, 1989). Interviews with journalists confirmed the observed elements of the Whitfield story - his Canadian identity, gold medal victory, heroic performance, as well as other features (genuine personality, athletic good looks) - that made him newsworthy. Covering these attributes of Whitfield helped newsmakers to produce news that was attractive to audiences, and maintained circulation, viewership, and ad ratings, strengthening the media "audience commodity" (Sparks, 1992). Interviews with marketers revealed that Whitfield was commercially attractive because the meanings associated with his media image could be attached to brands through the endorsement and sponsorship process in order to improve brand equity, the value that consumers attribute to a brand of product or service (Keller, 1993). The results support a model of celebrity product endorsement based on the transfer of meanings from the endorser to the product and subsequently, to the consumer (McCracken, 1989). Overall, the results suggest intertextual linkages between media production and marketing as they relate to celebrity athletes in Canada. Whitfield's positive media image was understood to impact his marketability and contributed to a "vortex of publicity" (Wernick, 1991) by linking stages along the promotional chain.