cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
First Simulation Results for the Photon in a Non-Commutative Space
Creators: name: Bietenholz, W.
name: Hofheinz, F.
name: Nishimura, J.
name: Susaki, Y.
name: Volkholz, J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present preliminary simulation results for QED in a non-commutative 4d space-time, which is discretized to a fuzzy lattice. Its numerical treatment becomes feasible after its mapping onto a dimensionally reduced twisted Eguchi-Kawai matrix model. In this formulation we investigate the Wilson loops and in particular the Creutz ratios. This is an ongoing project which aims at non-perturbative predictions for the photon, which can be confronted with phenomenology in order to verify the possible existence of non-commutativity in nature.
description: 3 pages, 4 figures, talk presented by J. Volkholz at Lattice2004(theory)
Single-view 2D CNNs with Fully Automatic Non-nodule Categorization for False Positive Reduction in Pulmonary Nodule Detection
Creators: name: Eun, Hyunjun
name: Kim, Daeyeong
name: Jung, Chanho
name: Kim, Changick
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Background and Objective: In pulmonary nodule detection, the first stage, candidate detection, aims to detect suspicious pulmonary nodules. However, detected candidates include many false positives and thus in the following stage, false positive reduction, such false positives are reliably reduced. Note that this task is challenging due to 1) the imbalance between the numbers of nodules and non-nodules and 2) the intra-class diversity of non-nodules. Although techniques using 3D convolutional neural networks (CNNs) have shown promising performance, they suffer from high computational complexity which hinders constructing deep networks. To efficiently address these problems, we propose a novel framework using the ensemble of 2D CNNs using single views, which outperforms existing 3D CNN-based methods. Methods: Our ensemble of 2D CNNs utilizes single-view 2D patches to improve both computational and memory efficiency compared to previous techniques exploiting 3D CNNs. We first categorize non-nodules on the basis of features encoded by an autoencoder. Then, all 2D CNNs are trained by using the same nodule samples, but with different types of non-nodules. By extending the learning capability, this training scheme resolves difficulties of extracting representative features from non-nodules with large appearance variations. Note that, instead of manual categorization requiring the heavy workload of radiologists, we propose to automatically categorize non-nodules based on the autoencoder and k-means clustering.
description: 12 pages, 16 figures
title: Waste to value - ionic liquid strategies for the valorization of spent coffee grounds
Creators: name: Khlan, Diana
Publisher: name: TU Wien
Year: 2015
Subjects: subject: Ionische Flüssigkeiten
subject: Biomasse
subject: Nachhaltige Chemie
subject: Wirkstoffe
subject: Ionic Liquids
subject: Biomass
subject: Sustainable Chemistry
subject: Active Ingredients
subject: Food Waste

description: This thesis focuses on the development of alternative solvent systems for the improved extraction of pharmaceutically active components from waste coffee. Different types of ionic liquids including conventional ionic liquids based on imidazolium or pyridinium cations, distillable ionic liquids or switchable ionic liquids were successfully synthesized, characterized and applied for spent coffee grounds dissolution. These ionic liquids as well as mixtures of 1-ethyl-3-methylimidazolium acetate ([C2mim]OAc) with conventional solvents such as water or ethanol were used for the extraction of active ingredients including caffeine, chlorogenic acid, phenols and flavonoids. After evaluation of different extraction conditions, caffeine was extracted in the greatest yield with the mixture of [C2mim]OAc/H2O (50 wt%), total phenols and flavonoids could be extracted with the best yields with pure [C2mim]OAc whereas chlorogenic acid could only be extracted with pure water. The last part of this thesis focuses on the membrane separation of solvent mixtures used for the extraction of spent coffee grounds. Analytical strategies to determine the composition of [C2mim]OAc/H2O, [C2mim]OAc/EtOH and EtOH/H2O binary mixtures were developed. The separation of these binary mixtures was investigated using a stirred cell membrane set-up with four different membranes; however no separation could be observed.
Coulomb interactions and renormalization of semi-Dirac fermions near a topological Lifshitz transition
Creators: name: Kotov, Valeri N.
name: Uchoa, Bruno
name: Sushkov, Oleg P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We aim to understand how the spectrum of semi-Dirac fermions is renormalized due to long-range Coulomb electron-electron interactions at a topological Lifshitz transition, where two Dirac cones merge. At the transition, the electronic spectrum is characterized by massive quadratic dispersion in one direction, while it remains linear in the other. We have found that, to lowest order, the unconventional log squared (double logarithmic) correction to the quasiparticle mass in bare perturbation theory leads to resummation into strong mass renormalization in the exact full solution of the perturbative renormalization group equations. This behavior effectively wipes out the curvature of the dispersion and leads to Dirac cone restoration at low energy: the system flows towards Dirac dispersion which is anisotropic but linear in momentum, with interaction-depended logarithmic modulation. The Berry phase associated with the restored critical Dirac spectrum is zero - a property guaranteed by time-reversal symmetry and unchanged by renormalization. Our results are in contrast with the behavior that has been found within the large-$N$ approach.
description: 10 pages, 5 figures
Exploring Lattice Methods for Cold Fermionic Atoms
Creators: name: Wingate, Matthew
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: There has been a surge of experimental effort recently in cooling trapped fermionic atoms to quantum degeneracy. By varying an external magnetic field, interactions between atoms can be made arbitrarily strong. When the S wave scattering length becomes comparable to and larger than the interparticle spacing, standard mean field analysis breaks down. In this case the system exhibits a type of universality, and J-W. Chen and D. B. Kaplan recently showed how this system can be studied from first principles using lattice field theory. This poster presents the first results of exploratory simulations. The existence of a continuum limit is checked and the pairing condensate is studied as a function of the external source strength over a range of temperatures. Preliminary results show simulations can locate the critical temperature.
description: Poster presented at Lattice2004(non-zero), Fermilab, 21-26 June 2004. 3 pages
Campaign learning and the economy
Creators: name: Matthews, John Scott
Publisher: name: University of British Columbia
Year: 2010

description: The conventional wisdom is that election campaigns facilitate political learning. According to this so-called 'enlightenment thesis,' the contestation and noise of the campaign supplies voters with both the psychological motivation and informational resources to make better vote choices. In this way, election campaigns can be seen as helping overcome one of the central problems of modern democratic politics: chronically low levels of political knowledge across electorates and profound inequalities of political knowledge within them. This dissertation investigates the enlightenment thesis through analysis of the impact of election campaigns on learning in the domain of the economy. In particular, the dissertation examines campaign period change in, first, the quality of national economic perceptions, and second, the quality of the link between national economic perceptions and vote choice. The analysis proceeds through statistical analysis of survey data collected during ten national election campaigns across four countries (Canada, New Zealand, the United Kingdom, and the United States). The dissertation concludes that there is little evidence of campaign period learning in the domain of the economy. There is no general tendency for the campaign to improve the quality of national economic perceptions or to improve the quality of the link between these perceptions and the vote. Indeed, the campaign is as likely to frustrate as facilitate political learning in the economic domain. Furthermore, there is no general tendency for the campaign to offset pre-existing inequalities either in the quality of national economic perceptions or in the quality of the link between these perceptions and vote choice.
8580: Samuel Robert Bloomfield
Creators: name: Project Team, Lest We Forget
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430304
subject: British history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430316
subject: International history

description: A commemorative telegram from 1916 marking the death of Bloomfield.

Aggie Bloomfield (wife of Sam) is the sister of Arthur Thomas' wife.
Analyticity in theta and infinite volume limit of the topological susceptibility in SU(3) gauge theory
Creators: name: Alles, B.
name: D'Elia, M.
name: Di Giacomo, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: The large volume behaviour of the topological susceptibility in SU(3) gauge theory is investigated on the lattice to establish an upper limit on the parity violating terms.
description: 2 pages, 1 figure, poster presented at Lattice 2004(topology)
Construction of univalent harmonic mappings convex in one direction
Creators: name: Wang, Zhi-Gang
name: Shi, Lei
name: Jiang, Yue-Ping
Publisher: name: arXiv
Year: 2020
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: Primary 30C55, Secondary 58E20

description: In the present paper, we derive several conditions of linear combinations and convolutions of harmonic mappings to be univalent and convex in one direction, one of them gives a partial answer to an open problem proposed by Dorff. The results presented here provide extensions and improvements of those given in some earlier works. Several examples of univalent harmonic mappings convex in one direction are also constructed to demonstrate the main results.
description: 15 pages, 9 figures
Index Theorem and Random Matrix Theory for Improved Staggered Quarks
Creators: name: Follana, E.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We study various improved staggered quark Dirac operators on quenched gluon backgrounds in lattice QCD generated using a Symanzik-improved gluon action. We find a clear separation of the spectrum of eigenvalues into would-be zero modes and others. The number of would-be zero modes depends on the topological charge as expected from the Index Theorem, and their chirality expectation value is large. The remaining modes have low chirality and show clear signs of clustering into quartets and approaching the random matrix theory predictions for all topological charge sectors. We conclude that improvement of the fermionic and gauge actions moves the staggered quarks closer to the continuum limit where they respond correctly to QCD topology.
description: Lattice2004(plenary)
Dimensional oxidization on coset space
Creators: name: Harada, Koichi
name: Ho, Pei-Ming
name: Matsuo, Yutaka
name: Watanabe, Akimi
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the matrix model approaches of string/M theories, one starts from a generic symmetry $gl(\infty)$ to reproduce the space-time manifold. In this paper, we consider the generalization in which the space-time manifold emerges from a gauge symmetry algebra which is not necessarily $gl(\infty)$. We focus on the second nontrivial example after the toroidal compactification, the coset space $G/H$, and propose a specific infinite-dimensional symmetry which realizes the geometry. It consists of the gauge-algebra valued functions on the coset and Lorentzian generator pairs associated with the isometry. We show that the $0$-dimensional gauge theory with the mass and Chern-Simons terms gives the gauge theory on the coset with scalar fields associated with $H$.
description: 29 pages
8584: Samuel Robert Bloomfield
Creators: name: Project Team, Lest We Forget
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430304
subject: British history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430316
subject: International history

description: Christmas cards from the Royal family 1914 and 1915.
Diagnóstico de la calidad del agua de consumo en las comunidades del sector rural noreste del municipio de León, Nicaragua
Creators: name: Gonzalez, Oscar
name: Aguirre, Javier
name: Saugar, Gema
name: Orozco, Lyli
name: Alvarez, Guadalupe
name: Palacios, Karen
name: Guevara, Octavio
name: Gonzalez, Oscar
name: Aguirre, Javier
name: Saugar, Gema
name: Orozco, Lyli
name: Alvarez, Guadalupe
name: Palacios, Karen
name: Guevara, Octavio
Publisher: name: Unknown
Year: 2007
Subjects: subject: Environmental Economics and Policy
subject: coliformes
subject: pesticidas
subject: nitratos
subject: pozos

description: Es ampliamente conocido que una de las principales fuentes de agua de consumo humano, es el agua subterránea que actualmente está siendo receptora de la contaminación provocada por el ser humano. El objetivo de este estudio fue caracterizar la calidad del agua de consumo humano del sector rural noreste de León. Se realizaron análisis microbiológicos (N=69), análisis físico-químicos (N=67) y análisis de plaguicidas (N=48). Además, se realizó una encuesta sobre las características de las fuentes de agu (pozos), el uso y tratamientos de sus aguas. Los análisis microbiológicos mostraron que un 95.7% de los resultados, no cumplen con los requisitos establecidos en las normas CAPRE. Según los estándares del laboratorio de microbiología de la UNAN-León, el 97.1% de las muestras están contaminadas. El 18.8% de los pozos presenta contaminación físico-química y el 31.3% de los pozos presentan contaminación con pesticidas. El principal pesticida encontrado fue el Clorpirifos, seguido por DDT. Las pruebas estadísticas asociaron significativamente ( = 0.580, p<0.05) la contaminación microbiana con el tipo de pozo. Existe un grado de asociación significativa entre la contaminación microbiana y la presencia de animales cerca del pozo. Los resultados sugieren que la contaminación se da fundamentalmente por introducción directa de mecates contaminados a los pozos.
description: Universitas (Leon),Volumen 1, Número 1, Año 2007, pag 7-13.
Instability of compact stars with a nonminimal scalar-derivative coupling
Creators: name: Kase, Ryotaro
name: Tsujikawa, Shinji
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: For a theory in which a scalar field $ϕ$ has a nonminimal derivative coupling to the Einstein tensor $G_{μν}$ of the form $ϕ\,G_{μν}\nabla^μ\nabla^ν ϕ$, it is known that there exists a branch of static and spherically-symmetric relativistic stars endowed with a scalar hair in their interiors. We study the stability of such hairy solutions with a radial field dependence $ϕ(r)$ against odd- and even-parity perturbations. We show that, for the star compactness ${\cal C}$ smaller than $1/3$, they are prone to Laplacian instabilities of the even-parity perturbation associated with the scalar-field propagation along an angular direction. Even for ${\cal C}>1/3$, the hairy star solutions are subject to ghost instabilities. We also find that even the other branch with a vanishing background field derivative is unstable for a positive perfect-fluid pressure, due to nonstandard propagation of the field perturbation $δϕ$ inside the star. Thus, there are no stable star configurations in derivative coupling theory without a standard kinetic term, including both relativistic and nonrelativistic compact objects.
description: 17 pages, 8 figures, published version
Metrología Química I: Calibración de un pHmetro y Control de Calidad
Creators: name: Delgado, Marco
name: Vanegas, Manuel
name: Delgado, Gustavo
name: Delgado, Marco
name: Vanegas, Manuel
name: Delgado, Gustavo
Publisher: name: Unknown
Year: 2007
Subjects: subject: Environmental Economics and Policy
subject: Metrología química
subject: calibración de pH-metro
subject: cartas de control en medición de pH
subject: control de calidad en medición de pH.

description: El objetivo principal del presente trabajo es establecer una metodología confiable para la calibración de un pHmetro utilizando un calibrador de pH y soluciones de referencia de pH certificadas. En primer lugar se verificaron las especificaciones de la calibración del pHmetro declaradas por el fabricante, utilizando un calibrador de pH. Se verificó la linealidad de la respuesta de potencial del electrodo para diferentes pH y se evaluó la eficiencia del electrodo, encontrándose un valor de 98.39 %. Se determinó el modelo de calibración entre la respuesta de pH del instrumento y los valores de pH establecidos en soluciones de referencia certificadas de pH 4.00, 7.00 y 10.00, encontrándose un valor de pendiente igual a 1 y un intercepto de 0, lo que indica el buen funcionamiento del instrumento. Por último, se hizo un estudio de la repetibilidad durante 5 días consecutivos utilizando la prueba de Bartlett para la comparación de las precisiones de cada serie de resultados y ANOVA de un factor para la comparación entre las medias de cada día. Por último, se elaboraron las cartas de control para el pH de las soluciones de referencia certificadas, con el fin de llevar un control de calidad en las mediciones de rutina.
description: Revista Universitas (Leon), Vol 1, Num 1, 2007. Pag 14-20
On a subclass of starlike functions associated with a vertical strip domain
Creators: name: Sun, Yong
name: Wang, Zhi-Gang
name: Rasila, Antti
name: Sokol, Janusz
Publisher: name: arXiv
Year: 2020
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: Primary 30C45, Secondary 30C55

description: In this paper, we consider a subclass of starlike functions associated with a vertical strip domain. Several results concerned with integral representations, convolutions, and coefficient inequalities for functions belonging to this class are obtained. Furthermore, we consider radius problems and inclusion relations involving certain classes of strongly starlike functions, parabolic starlike functions and other types of starlike functions. The results are essential improvements of the corresponding results obtained by Kargar et al., and the derivations are similar to those used earlier by Sun et al. and Kwon et al..
description: 13 pages, 1 table
Search and analysis of giant radio galaxies with associated nuclei (SAGAN) -- I : New sample and multi-wavelength studies
Creators: name: Dabhade, Pratik
name: Mahato, Mousumi
name: Bagchi, Joydeep
name: Saikia, D. J.
name: Combes, Francoise
name: Sankhyayan, Shishir
name: Röttgering, H. J. A.
name: Ho, L. C.
name: Gaikwad, Madhuri
name: Raychaudhury, Somak
name: Vaidya, Bhargav
name: Guiderdoni, Bruno
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the first results of a project called SAGAN, which is dedicated solely to the studies of relatively rare megaparsec-scale radio galaxies in the Universe, called giant radio galaxies (GRGs). We have identified 162 new GRGs primarily from the NVSS with sizes ranging from ~0.71 Mpc to 2.82 Mpc in the redshift range of ~0.03 - 0.95, of which 23 are hosted by quasars (giant radio quasars, GRQs). As part of the project SAGAN, we have created a database of all known GRGs, the GRG catalogue, from the literature (including our new sample); it includes 820 sources. For the first time, we present the multi-wavelength properties of the largest sample of GRGs. Our results establish that the distributions of the radio spectral index and the black hole mass of GRGs do not differ from the corresponding distributions of normal-sized radio galaxies (RGs). However, GRGs have a lower Eddington ratio (ER) than RGs. Using the mid-infrared data, we classified GRGs in terms of their accretion mode: either a high-power radiatively efficient high-excitation state, or a radiatively inefficient low-excitation state. We find that GRGs in high-excitation state statistically have larger sizes, stronger radio power, jet kinetic power, and higher ER than those in low-excitation state. Our analysis reveals a strong correlation between the ER and the scaled jet kinetic power, which suggests a disc-jet coupling. Our environmental study reveals that ~10% of all GRGs may reside at the centres of galaxy clusters, in a denser galactic environment, while the majority appears to reside in a sparse environment. We find that the probability of BCG as a GRG is quite low. We present new results for GRGs that range from black hole mass to large-scale environment properties. We discuss their formation and growth scenarios, highlighting the key physical factors that cause them to reach their gigantic size. Abridged.
description: Accepted for publication in Astronomy & Astrophysics. 14 figures, 7 tables and 7 montages. Comments are welcome. "SAGAN Project website https://sites.google.com/site/anantasakyatta/sagan"
Gridless DOA Estimation and Root-MUSIC for Non-Uniform Arrays
Creators: name: Wagner, Mark
name: Park, Yongsung
name: Gerstoft, Peter
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The problem of gridless direction of arrival (DOA) estimation is addressed in the non-uniform array (NUA) case. Traditionally, gridless DOA estimation and root-MUSIC are only applicable for measurements from a uniform linear array (ULA). This is because the sample covariance matrix of ULA measurements has Toeplitz structure, and both algorithms are based on the Vandermonde decomposition of a Toeplitz matrix. The Vandermonde decomposition breaks a Toeplitz matrix into its harmonic components, from which the DOAs are estimated. First, we present the `irregular' Toeplitz matrix and irregular Vandermonde decomposition (IVD), which generalizes the Vandermonde decomposition to apply to a more general set of matrices. It is shown that the IVD is related to the MUSIC and root-MUSIC algorithms. Next, gridless DOA is generalized to the NUA case using IVD. The resulting non-convex optimization problem is solved using alternating projections (AP). A numerical analysis is performed on the AP based solution which shows that the generalization to NUAs has similar performance to traditional gridless DOA.
Twisting lemma for $Λ$-adic modules
Creators: name: Ghosh, Sohan
name: Jha, Somnath
name: Shekhar, Sudhanshu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: A classical twisting lemma says that given a finitely generated torsion module $M$ over the Iwasawa algebra $\mathbb{Z}_p[[Γ]]$ with $Γ\cong \mathbb{Z}_p, \ \exists$ a continuous character $θ: Γ\rightarrow \mathbb{Z}_p^\times$ such that, the $ Γ^{n}$-Euler characteristic of the twist $M(θ)$ is finite for every $n$. This twisting lemma has been generalized for the Iwasawa algebra of a general compact $p$-adic Lie group $G$. In this article, we consider a further generalization of the twisting lemma to $\mathcal{T}[[G]]$ modules, where $G$ is a compact $p$-adic Lie group and $\mathcal{T}$ is a finite extension of $\mathbb{Z}_p[[X]]$. Such modules naturally occur in Hida theory. We also indicate arithmetic application by considering the twisted Euler Characteristic of the big Selmer (respectively fine Selmer) group of a $Λ$-adic form over a $p$-adic Lie extension.
description: 14 pages
Extreme close encounters between proto-Mercury and proto-Venus in terrestrial planet formation
Creators: name: Fang, Tong
name: Deng, Hongping
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Modern models of terrestrial planet formation require solids depletion interior to 0.5-0.7 au in the planetesimal disk to explain the small mass of Mercury. Earth and Venus analogues emerge after ~100 Myr collisional growth while Mercury form in the diffusive tails of the planetesimal disk. We carried out 250 N-body simulations of planetesimal disks with mass confined to 0.7-1.0 au to study the statistics of close encounters which were recently proposed as an explanation for the high iron mass fraction in Mercury by Deng (2020). We formed 39 Mercury analogues in total and all proto-Mercury analogues were scattered inward by proto-Venus. Proto-Mercury typically experiences 6 extreme close encounters (closest approach smaller than 6 Venus radii) with Proto-Venus after Proto-Venus acquires 0.7 Venus Mass. At such close separation, the tidal interaction can already affect the orbital motion significantly such that the N-body treatment itself is invalid. More and closer encounters are expected should tidal dissipation of orbital angular momentum accounted. Hybrid N-body hydrodynamic simulations, treating orbital and encounter dynamics self-consistently, are desirable to evaluate the degree of tidal mantle stripping of proto-Mercury.
description: MNRAS published
Metrología Química II: Estimación de la Incertidumbre en la Medición de pH en Aguas
Creators: name: Delgado, Marco
name: Vanegas, Manuel
name: Delgado, Gustavo
name: Delgado, Marco
name: Vanegas, Manuel
name: Delgado, Gustavo
Publisher: name: Unknown
Year: 2008
Subjects: subject: Environmental Economics and Policy
subject: Metrología química
subject: Incertidumbre en la medición de pH en aguas
subject: Incertidumbre expandida relativa en la medición de pH
subject: Potencial de asimetría

description: E l objetivo principal del presente trabajo es estimar la incertidumbre en la determinación del pH en una muestra de agua tomando en cuenta todos los parámetros experimentales que intervienen en el proceso de medición. Para evaluar la incertidumbre se siguió el procedimiento general establecido en la guía GUM ISO 1995. Se derivó el modelo matemático, donde interviene el efecto del potencial de asimetría del electrodo de vidrio utilizado. Se identificaron todas las fuentes de incertidumbres a través del diagrama causa-efecto. Se calcularon todos los componentes de las incertidumbres y se combinaron a través de la ley de propagación de la incertidumbre para obtener el valor de la incertidumbre estándar en la medición del pH en la muestra de agua (upHx). Se elaboró un diagrama de Pareto, donde se demuestra que de 7 fuentes principales de incertidumbre, solamente la repetibilidad en la lectura del potencial (Ex) de la muestra y la incertidumbre en el cálculo del pH donde el potencial es nulo (pH0) son los que influyen en la estimación de upHx, cuyo valor fue 0.05. El intervalo de confianza encontrado fue de 7.6 ± 0.11. La incertidumbre expandida fue calculada tomando como factor de cobertura el valor de t al 95% de nivel de confianza y 18 grados de libertad efectivos.
Un Experimento sencillo para evaluar la Incertidumbre siguiendo la guia GUM ISO 1995 y utilizando el cálculo simbólico MAPLE 11.0
Creators: name: Delgado, Gustavo
name: Nagel, Betram
name: Delgado, Gustavo
name: Nagel, Betram
Publisher: name: Unknown
Year: 2008
Subjects: Environmental Economics and Policy

description: E l objetivo del presente estudio, es estimar la incertidumbre en la medición del área total de un triángulo aplicando la guía de estimación de la incertidumbre GUM ISO 1995 y utilizando el programa de cálculo simbólico MAPLE 11. La medición la realizó un grupo de 10 estudiantes de la maestría en Química y Gestión de la Calidad, utilizando el mismo objeto de medición y el mismo instrumento de medición. Se derivó el modelo matemático, se identificaron los componentes de las incertidumbres a través del diagrama de causa-efecto, se calcularon los coeficientes de sensibilidad utilizando el programa de cálculo simbólico Maple 11, se elaboró un balance de las incertidumbres y un diagrama de Pareto donde se reflejan las variables que más influyen en la incertidumbre del mensurando. Se calcularon las incertidumbres combinada y expandida con un factor de cobertura igual a t al 95% de nivel de confianza y 22 grados de libertad efectivos. Finalmente, se evaluó el intervalo de confianza, encontrándose un valor de (50.72 ± 0.39) cm2. La incertidumbre expandida relativa fue menor del 1%, indicando buena precisión en el proceso de medición.
title: Outcasts On The Inside? A Case Study Of The Career Aspirations And Experiences Of Widening Participation Students From A Merseyside College Of Higher Education
Creators: name: Redmond, Paul M.
Publisher: name: The Open University
Year: 2005

description: Firstly, the study is of adult widening participation students in Merseyside, England. Nationally, the economic contribution made by higher education to the economy and the provision of a skilled, adaptable workforce, is a major topic of concern, and even more so in regions such as Merseyside in the North West of England, which have experienced long-term structural economic problems and recession (LSC, 2003). Consequently, it is likely that appeals to the vocational benefits of higher education are less likely to be accepted by widening participation students in Merseyside, especially if their 'horizons of action' are local rather than cosmopolitan. Social, structural and economic factors, therefore, are considered to be an important context to this thesis. Secondly, the research is unique in that it included a number of tracer interviews with widening participation students six months after their graduation. By doing this, the research sought to utilise their subsequent vantage point to gain an understanding of their perspectives upon work, higher education and the role and potential of university-based careers education. This was particularly central to me as the researcher as I currently am in charge of careers education and guidance at Liverpool Hope University College, the Merseyside Institution of Higher Education where the research was carried out. Thirdly, the research sought to critically examine the model of higher education student relationships to the economy proposed by Brown and Scase (1994). 1 wanted to find out if their six category model of economy-student relationships, which was developed in the early 1990s with 18-21 year old students in traditional higher education replicated, and resonated with, the points of view of mature students in a post 1992 University College sector in a depressed part of the economy. Whilst it was likely that there would be similarities, it was also considered possible that differences, were likely as a result of the regional context, the type of student and the positioning of the Institution within the hierarchy of higher education (Ball et al., 2002). It was considered highly likely that the findings will have major implications for careers education in higher education. We have a duty to ensure that the careers service is relevant to the needs of all Liverpool Hope University College students, regardless of social, cultural or academic backgrounds.
Efecto de factores físicos y bioquímicos sobre la formación de estructuras infectivas de Magnaporthe grisea agente causal de pyriculiarosis en arroz (Oryza sativa)
Creators: name: Salazar Anton, Wilber
name: Salazar Anton, Wilber
Publisher: name: Unknown
Year: 2008
Subjects: subject: Environmental Economics and Policy
subject: cAMP
subject: Colagenasa
subject: Apresorio
subject: Hidrofóbica
subject: Hidrofílica.

description: E ste estudio se realizó en el laboratorio de Fitopatología de la Universidad de Kobe, Japón, evaluándose el efecto de dos factores físicos (superficies hidrofóbicas e hidrofílicas) y dos factores químicos (Adenosin Monofosfato cíclico (cAMP) y colagenasa) sobre la capacidad de adhesión y producción de apresorios de Magnaporthe grisea sobre superficies hidrofóbicas e hidrofílicas. En este estudio la concentración de conidias fue ajustada a 1x104 conidias/mililitro y se utilizó plástico Gelbond™ Film. Los resultados indican que sobre superficies hidrofóbicas el 78% de conidias produjeron apresorios, reduciéndose este porcentaje a cero cuando fueron colocadas sobre una superficie hidrofílica. Sin embargo, la adición de cAMP a las conidias creciendo sobre superficies hidrofílicas les restituyó la capacidad de producir apresorios hasta 69%. Cuando se aplicó colagenasa a la solución de conidias después de 6 horas de incubación su capacidad de adhesión se redujo hasta 61% en comparación con el tratamiento testigo sin colagenasa. Esta reducción fue más evidente cuando la solución de conidias se incubó por 6 horas junto con la colagenasa, reduciéndose el número de conidias adheridas a 97% en comparación con el testigo. La colagenasa también redujo la severidad de los síntomas de M. grisea en plántulas de arroz. La formación de estructuras infectivas de M. grisea se ve favorecida por superficies hidrofóbicas y la presencia de cAMP, en cambio, las superficies hidrofílicas y la colagenasa las inhiben.
Extremely energetic cosmic neutrinos and their impact on particle physics and cosmology
Creators: name: Ringwald, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Existing and planned neutrino detectors, sensitive in the energy regime from 10^{17} eV to 10^{23} eV, offer opportunities for particle physics and cosmology. In this contribution, we discuss particularly the possibilities to infer information about physics beyond the Standard Model at center-of-mass energies beyond the reach of the Large Hadron Collider, as well as to detect big bang relic neutrinos via absorption dips in the observed neutrino spectra.
description: 8 pages, 10 embedded figures, espcrc2.sty; talk presented at Cosmic Ray International Seminar 2004, Catania, Italy
Antilocalization and spin-orbit coupling in hole strained GaAs/InGaAs/GaAs quantum well heterostructures
Creators: name: Minkov, G. M.
name: Sherstobitov, A. A.
name: Germanenko, A. V.
name: Rut, O. E.
name: Larionova, V. A.
name: Zvonkov, B. N.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Low-field magnetoresistance in p-type strained quantum wells is studied. It is shown that the Rashba mechanism leads to the cubic in quasimomentum spin-orbit splitting of the hole energy spectrum and the antilocalization behavior of low-field magnetoresistance is well described by the Hikami-Larkin-Nagaoka expression.
description: 7 pages, 7 figures
Direct observation of electronic domains in manganites by spatially resolved spectroscopy
Creators: name: Sarma, D. D.
name: Topwal, Dinesh
name: Manju, U.
name: Krishnakumar, S. R.
name: Bertolo, M.
name: La Rosa, S.
name: Cautero, G.
name: Koo, T. Y.
name: Sharma, P. A.
name: Cheong, S-W.
name: Fujimori, A.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We use a spatially resolved, direct spectroscopic probe for electronic structure with an additional sensitivity to chemical compositions to investigate high-quality single crystal samples of La_{1/4}Pr_{3/8}Ca_{3/8}MnO_{3}, establishing the formation of distinct insulating domains embedded in the metallic host at low temperatures. These domains are found to be at least an order of magnitude larger in size compared to previous estimates and exhibit memory effects on temperature cycling in the absence of any perceptible chemical inhomogeneity, suggesting long-range strains as the probable origin.
description: 8 pages of text and figures. "To appear as Elettra - Highlights 2004; a slightly different version has appeared in Phys. Rev. Lett. Vol 93, 097202, (2004)"
Bounds on CDM and neutrino isocurvature perturbations from CMB and LSS data
Creators: name: Beltran, Maria
name: Garcia-Bellido, Juan
name: Lesgourgues, Julien
name: Riazuelo, Alain
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Generic models for the origin of structure predict a spectrum of initial fluctuations with a mixture of adiabatic and isocurvature perturbations. Using the observed anisotropies of the cosmic microwave backgound, the matter power spectra from large scale structure surveys and the luminosity distance vs redshift relation from supernovae of type Ia, we obtain strong bounds on the possible cold dark matter/baryon as well as neutrino isocurvature contributions to the primordial fluctations in the Universe. Neglecting the possible effects of spatial curvature and tensor perturbations, we perform a Bayesian likelihood analysis with thirteen free parameters, including independent spectral indexes for each of the modes and for their cross-correlation angle. We find that around a pivot wavenumber of k=0.05 h/Mpc the amplitude of the correlated isocurvature component cannot be larger than about 60% for the cold dark matter mode, 40% for the neutrino density mode, and 30% for the neutrino velocity mode, at 2 sigma. In the first case, our bound is larger than the WMAP first-year result, presumably because we prefer not to include any data from Lyman-alpha forests, but then obtain large blue spectral indexes for the non-adiabatic contributions. We also translate our bounds in terms of constraints on double inflation models with two uncoupled massive fields.
description: 12 pages, 5 figures
Thermal fluctuations and longitudinal relaxation of single-domain magnetic particles at elevated temperatures
Creators: name: Garanin, D. A.
name: Chubykalo-Fesenko, O.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present numerical and analytical results for the swiching times of magnetic nanoparticles with uniaxial anisotropy at elevated temperatures, including the vicinity of T_c. The consideration is based in the Landau-Lifshitz-Bloch equation that includes the relaxation of the magnetization magnitude M. The resulting switching times are shorter than those following from the naive Landau-Lifshitz equation due to (i) additional barrier lowering because of the reduction of M at the barrier and (ii) critical divergence of the damping parameters.
description: 4 PR pages, 1 figure
Pre-processing, group accretion and the orbital trajectories of associated subhaloes
Creators: name: Bakels, Lucie
name: Ludlow, Aaron D.
name: Power, Chris
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We use a high-resolution cosmological dark matter-only simulation to study the orbital trajectories of haloes and subhaloes in the environs of isolated hosts. We carefully tally all apsis points and use them to distinguish haloes that are infalling for the first time from those that occupy more evolved orbits. We find that roughly 21 per cent of subhaloes within a host's virial radius are currently on first infall, and have not yet reached their first orbital pericentre; roughly 44 per cent are still approaching their first apocentre after infall. For the range of host masses studied, roughly half of all accreted systems were pre-processed prior to infall, and about 20 per cent were accreted in groups. We confirm that the entire population of accreted subhaloes -- often referred to as "associated" subhaloes -- extend far beyond the virial radii of their hosts, with roughly half currently residing at distances that exceed $\approx 1.2\times r_{200}$. Many of these backsplash haloes have gained orbital energy since infall, and occupy extreme orbits that carry them well past their initial turnaround radii. Such extreme orbits are created during the initial accretion and dissolution of loosely bound groups, but also through penetrating encounters between subhaloes on subsequent orbits. The same processes may also give rise to unexpectedly abrupt losses of orbital energy. These effects combine, giving rise to a large variation in the ratio of sequent apocentres for accreted systems. We find that, within 2 virial radii from host centres, the concentrations of first-infall halos are remarkably similar those of isolated field halos, whereas backsplash haloes, as well as systems that were pre-processed, are considerably more concentrated.
description: 17 pages, 12 figures, submitted to MNRAS
The 0.03-10Mo mass function of young open clusters
Creators: name: Bouvier, J.
name: Moraux, E.
name: Stauffer, J. R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the present day mass functions (PDMFs) of 3 young open clusters over a mass range from 30 Jupiter masses to 10~\msunn. The PDMFs of the 3 clusters are remarkably similar, suggesting little impact of specific conditions (stellar density, metallicity, early dynamical evolution) on the mass distribution. Functional forms are provided to allow quantitative comparison with MFs derived in other environments.
description: 6 pages, to appear in "IMF@50", Corbelli, Palla, Zinnecker eds
Growth and magnetic properties of MnO2−delta nanowire microspheres
Creators: name: Yang, J. B.
name: Zhou, X. D.
name: James, W. J.
name: Malik, S. K.
name: Wang, C. S.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report the synthesis of MnO2−delta microspheres using hydrothermal and conventional chemical reaction methods. The microspheres of MnO2−delta consist of nanowires having a diameter of 20-50 nm and a length of 2-8 micro m. The value of the oxygen vacancy delta estimated from the x-ray photoelectron spectrum (XPS) is 0.3. The magnetization versus temperature curve indicates a magnetic transition at about 13 K. It is found that a parasitic ferromagnetic component is imposed on the antiferromagnetic structure of MnO2−delta, which might result from distortion of the lattice structure due to oxygen vacancies. The magnetic transition temperature TN is about 10 K lower than that of the bulk MnO2 single crystal.
Covariant derivative expansion of the heat kernel
Creators: name: Salcedo, L. L.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using the technique of labeled operators, compact explicit expressions are given for all traced heat kernel coefficients containing zero, two, four and six covariant derivatives, and for diagonal coefficients with zero, two and four derivatives. The results apply to boundaryless flat space-times and arbitrary non Abelian scalar and gauge background fields.
description: 16 pages, REVTEX. To appear in Eur.Phys.J.C. References added
SleepPoseNet: Multi-View Learning for Sleep Postural Transition Recognition Using UWB
Creators: name: Piriyajitakonkij, Maytus
name: Warin, Patchanon
name: Lakhan, Payongkit
name: Leelaarporn, Pitsharponrn
name: Pianpanit, Theerasarn
name: Kumchaiseemak, Nakorn
name: Suwajanakorn, Supasorn
name: Niparnan, Nattee
name: Mukhopadhyay, Subhas Chandra
name: Wilaiprasitporn, Theerawit
Publisher: name: arXiv
Year: 2020
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Recognizing movements during sleep is crucial for the monitoring of patients with sleep disorders, and the utilization of ultra-wideband (UWB) radar for the classification of human sleep postures has not been explored widely. This study investigates the performance of an off-the-shelf single antenna UWB in a novel application of sleep postural transition (SPT) recognition. The proposed Multi-View Learning, entitled SleepPoseNet or SPN, with time series data augmentation aims to classify four standard SPTs. SPN exhibits an ability to capture both time and frequency features, including the movement and direction of sleeping positions. The data recorded from 38 volunteers displayed that SPN with a mean accuracy of $73.7 \pm 0.8 \%$ significantly outperformed the mean accuracy of $59.9 \pm 0.7 \%$ obtained from deep convolution neural network (DCNN) in recent state-of-the-art work on human activity recognition using UWB. Apart from UWB system, SPN with the data augmentation can ultimately be adopted to learn and classify time series data in various applications.
Problem‐sourcing: a re‐framing of open innovation for R&D organisations
Creators: name: Cummings, Stephen
name: Daellenbach, Urs
name: Davenport, Sally
name: Campbell, Charles
name: Sammut-Bonnici, Tanya
name: Paroutis, Sotirios
Publisher: name: figshare
Year: 2020
Subjects: subject: 150399 Business and Management not elsewhere classified
subject: FOS: Economics and business

description: Abstract
PurposeWhile the benefits of open innovation (OI) and crowdsourcing (CS) for solutions to R&D problems have been widely promoted in the last ten years, their appropriateness for organisations specialising in providing R&D services has not been explicitly considered. This paper aims to examine an R&D organisation's response to increased adoption of OI and CS, highlight their drawbacks in this context, and analyse how and why the alternative of problem‐sourcing (PS) proved more effective.
Design/methodology/approachThe paper provides an in‐depth documentation and analysis of an initiative called: The “What's Your Problem New Zealand?” (WYPNZ) challenge. The use of a single case and qualitative approach allows the development of an illustrative, rich description and is suited to studying unique and novel events.
FindingsIn the context of professional R&D organisations, a range of benefits of CS for R&D problems rather than solutions were identified, including generating a potential pipeline of projects and clients as well as avoiding the challenge to the professional status of the organisation's research capability. An unexpected side‐effect was that the reputation of the research organisation as open, accessible and helpful was greatly enhanced. The success of the PS approach to CS for R&D provides insight into how some of the pitfalls of OI/CS can be better understood and potentially managed.
Originality/valueThe PS model provided by the “WYPNZ” initiative represents a new strategic possibility for R&D organisations that complements their traditional competencies by drawing on the openness that OI and CS seek to leverage. As such, it can provide insights for other organisations wishing to make use of the connectivity afforded by OI/CS in an alternative mode to that typically in use and reported in the literature.