cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Irradiated stars with convective envelopes
Creators: name: Lucy, L. B.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The observed radii of M dwarfs in eclipsing binaries exceed predicted radii by ~ 5%. To investigate this anomaly, the structure of low-mass stars irradiated by a close companion is considered. Irradiation modifies the surface boundary conditions and thereby also the adiabatic constants of their outer convection zones. This changes the models' radii and luminosities. For short-period M dwarf binaries with components of similar mass, radius inflation due to their mutual irradiation is found to be < 0.4%. This is an order of magnitude too small to explain the observed anomaly. Although stronger irradiation results in a monotonically increasing radius, a saturation effect limits the inflation to
description: 9 pages, 5 figures. Revisions incorporate referee's comments. Asymptotic theory added. Accepted by Astronomy & Astrophysics
title: ALS linked mutant Sigma receptor-1(E102Q) leads to disrupted RNA processing and ER stress mediated defects in protein homeostasis
Creators: name: Dreser, A.
name: Vollrath, J. T.
name: Sechi, A.
name: Yamoah, A.
name: Roos, A.
name: Katona, I.
name: Bohlega, S.
name: Al-Saif, A.
name: Wiemuth, D.
name: Tian, Y.
name: Vervoorts, J.
name: Dohmen, M.
name: Aninik, J.
name: Troost, D.
name: Weis, J.
name: Goswami, A.
Publisher: name: German Medical Science GMS Publishing House
Year: 2015
Subjects: subject: 610 Medical sciences; Medicine

description: Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease characterized by selective degeneration of upper and lower motor neurons and their target muscles. Mutant misfolded proteins, which often form intracellular inclusion bodies, are pathological hallmarks of both sporadic and familial[for full text, please go to the a.m. URL]
description: 60th Annual Meeting of the German Society for Neuropathology and Neuroanatomy (DGNN)
A dispersive analysis of $η'\toπ^+π^-γ$ and $η'\to \ell^+\ell^-γ$
Creators: name: Holz, Simon
name: Hanhart, Christoph
name: Hoferichter, Martin
name: Kubis, Bastian
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present a dispersive representation of the $η'$ transition form factor that allows one to account, in a consistent way, for the effects of $ρ$-$ω$ mixing in both the isoscalar and the isovector contributions. Using this formalism, we analyze recent data on $η'\to π^+π^-γ$ to constrain the isovector part of the form factor, individually and in combination with data for the pion vector form factor. As a first application, we use our results, in combination with the most recent input for the isoscalar part of the form factor, to predict the corresponding spectrum of $η'\to\ell^+\ell^-γ$, in particular we find the slope parameter $b_{η'}=1.431(23)\, \text{GeV}^{-2}$. With forthcoming data on the latter process, our results establish the necessary framework to improve the evaluation of the $η'$-pole contribution to the anomalous magnetic moment of the muon using experimental input from both $η'$ decay channels.
description: 18 pages, 2 figures, tension in $\epsilon_{\rho\omega}$ resolved by including higher orders in $e^2$
title: Povos e Culturas, v. 4 (1989): Educação em África (1989-1990)
title: Educação em África (1989-1990)
titleType: AlternativeTitle
Creators: name: Povos E Culturas
Publisher: name: Povos e Culturas
Year: 1989

description: In memoriam Prof. Doutor José de Freitas Ferreira...9-14 Introdução...17-21 Palavras proferidas pelo Presidente do CEPCEP, Engº Roberto Carneiro, na cerimónia oficial de abertura do Seminário Educação em África...25-27 Desenvolvimento e educação em África...29-38 Comentário à conferência "Desenvolvimento e educação em África"...39-50 O desenvolvimento da educação em África e o Banco de Desenvolvimento Africano...51-80 Empréstimos do Banco Mundial para a educação: desenvolvimentos passados, resultados presentes e possíveis sendas futuras...81-92 Comentário à conferência Empréstimos do Banco Mundial para a educação: desenvolvimentos passados, resultados presentes e possíveis sendas futuras...93-102 O sistema de educação somali...103-110 Universidades e desenvolvimento...111-124 Processos comparativos de inovação do curriculum secundário no Quénia...125-156 Comentário às conferências "O sistema de educação somali", "Universidades e desenvolvimento"...157-162 A cooperação educacional nos países africanos de língua portuguesa...163-174 A cooperação educacional nos países africanos de língua portuguesa...175-182 Comentário às conferências sobre cooperação educacional nos países africanos de língua portuguesa...183-188 Comentário às conferências sobre cooperação educacional nos países africanos de língua portuguesa...189-192 Encerramento...193-194 Encarando o futuro...197-200 Educação e desenvolvimento em África...201-204 O contributo das escolas católicas no processo de desenvolvimento na África...205-214 Inovação educativa: O ensino e a promoção das línguas africanas nos programas escolares nas zonas libertadas da UNITA em Angola...215-220 Ensino do português em África...221-226 Educação para o desenvolvimento. O programa de emergência para Angola...227-238 A empresa em África ou o desenvolvimento económico do cidadão...239-242 Roberto Chichorro...245-246 Nocturno para viola suburbana...247-248 A investigação e o desenvolvimento humanizante. Uma luta conjunta pelo bem-estar...251-260 A obra etnográfica de Thomaz Pires...261-318
The Practice Of Time Management In Construction Projects: Case Study Of Bole-Lemi Phase Ii And Kilinto Industrial Park Construction Projects
Creators: name: Agegnehu, Yegetahun
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: Time is one of the major constraints in projects. However, delivering construction projects within envisioned time is becoming ever challenging. This study tries to put light on how this important constraint is managed with respect to project time management functions and contractual requirements. The study also investigated as how delay and extension of time is assessed and analyzed. Taking two construction projects namely Bole-Lemi Phase II and Kilinto Industrial Park construction projects as cases, the research attempts to make an in-depth assessment of construction project time management practices. Construction time management process was developed consisting mainly of planning, scheduling and control of time and the associated tasks. The research methodology adopted a qualitative approach for data collection and analysis. All personnel from the contractors, consultant and employer taking part in the planning and monitoring of the project time have been interviewed. By interviewing the personnel, attending progress meetings and reviewing of the project documents and archives, the research explored the time management functions of the projects. It was found that the time management practice substantially lacked the necessary diligences required from the contractors and the consultant. The work programmes were not being updated in accordance with the requirements of the contract. Estimation of progress was found to be an ad-hoc. The assessment and analysis of extension of time be re short of standard methods. Most of the methods, techniques and tools used for time management were not standardized. It is recommended that time management taken seriously and become specialization as core function of project manage
Convex set of quantum states with positive partial transpose analysed by hit and run algorithm
Creators: name: Szymański, Konrad
name: Collins, Benoît
name: Szarek, Tomasz
name: Życzkowski, Karol
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 81Q99

description: The convex set of quantum states of a composite $K \times K$ system with positive partial transpose is analysed. A version of the hit and run algorithm is used to generate a sequence of random points covering this set uniformly and an estimation for the convergence speed of the algorithm is derived. For $K\ge 3$ this algorithm works faster than sampling over the entire set of states and verifying whether the partial transpose is positive. The level density of the PPT states is shown to differ from the Marchenko-Pastur distribution, supported in [0,4] and corresponding asymptotically to the entire set of quantum states. Based on the shifted semi--circle law, describing asymptotic level density of partially transposed states, and on the level density for the Gaussian unitary ensemble with constraints for the spectrum we find an explicit form of the probability distribution supported in [0,3], which describes well the level density obtained numerically for PPT states.
description: 11 pages, 4 figures
Estudio de la suficiencia de camas en la Unidad de Cuidados Intensivos del Hospital Universitario del Caribe de Cartagena de Indias
Creators: name: Otero Anaya, Armando
name: López Pabón, David
Publisher: name: Universidad de Cartagena
Year: 2016
Subjects: Unidad de cuidados intensivos - Camas
Unidad de cuidados intensivos - Estudio

description: Tesis (Especialista en Gerencia en Salud) -- Universidad de Cartagena. Facultad de Ciencias Económicas. Especialización en Gerencia en Salud, 2016
description: El presente estudio tiene por objeto determinar el número de camas requeridas para el óptimo funcionamiento del servicio de cuidados intensivos del hospital universitario del caribe, de acuerdo a la demanda que se presentó en el periodo de enero a junio de 2015.
Investigations of adenosine A2A receptor antagonists, dopamine D2 receptor agonists and dual acting ligands for the treatment of parkinson’s disease
Creators: name: Jorg, Manuela
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: In this project, the adenosine A2A receptor and the dopamine D2 receptor were studied as potential targets for the treatment of Parkinson’s disease. Investigated were both targets individually as well as the approach to target both receptors simultaneously with just one single molecule. Herein, present is the synthesis, characterization and pharmacological evaluation of the literature compound ZM 241385 and a series of structurally related adenosine A2A receptor antagonists. Further determined was a chemically and biologically suitable attachment position for linkers on the parent pharmacophores. From this research a triazolotriazine carboxylic acid congener with inhibitory potency equivalent to ZM 241385 has been established, allowing further functionalization towards the extracellular space of the adenosine A2A receptor. At the dopamine D2 receptor, a chemically and biologically suitable attachment position on the chemical structure of the dopamine D2 receptor agonist ropinirole was determined, allowing the development of an oxindole carboxylic acid and an oxindole amine congener. Based on these results a series of homobivalent ligands was synthesized, characterized and pharmacologically evaluated. The homobivalent ligands with a spacer length of 22 to 30 atoms exhibited up to an 80-fold increase in potency compared to the parent molecule ropinirole. Docking of the synthesized molecules in a dopamine D2 receptor dimer model indicated that the increase in potency of the homobivalent ligands was most likely due to an additional allosteric interaction and very unlikely due to interactions at two orthosteric sites across a homodimer. The research results from targeting each receptor individually formed the pillars for the synthesis, characterization and pharmacological evaluation of our dual acting ligands targeting the dopamine D2 and adenosine A2A receptors with just one molecule. A library of compounds ranging from classical heterobivalent ligands to more drug-like merged molecules was synthesized. The most encouraging higher integrated “drug-like” molecules exhibited promising initial blood-brain barrier permeability results and maintained similar EC50 values to the dopamine D2 receptor agonist ropinirole but showed a slight decrease in inhibitory potency compared to the adenosine A2A receptor antagonist ZM 241385. Conversely, the pharmacological evaluation of the dual acting ligands revealed that the most potent classical heterobivalent ligands showed comparable affinities to both original pharmacophores.
p38α mitogen-activated protein kinase inhibitors as anti-inflammatory agents
Creators: name: Vinh, Natalie Bao Anh
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: p38α MAPK is an intracellular serine/threonine protein kinase that regulates many physiological processes including the biosynthesis of inflammatory cytokines. Elevated levels of inflammatory cytokines have been implicated in the pathogenesis of several chronic diseases including rheumatoid arthritis, inflammatory bowel disease, psoriasis and cardiovascular disease. Recently, the use of biologics to modulate cytokines has shown efficacy in treating some of these diseases. Therefore, it is expected that orally active inhibitors of p38α MAPK will demonstrate similar therapeutic effects and present an attractive alternative for the treatment of chronic inflammatory diseases. This research uses a computer-assisted structure-based design approach for the development of p38α MAPK inhibitors. A series of ligands were designed and docked into a crystal structure model. Compounds were synthesised and evaluated in enzyme and cellular assays. A number of these compounds were found to inhibit p38α MAPK and exhibit potent anti-inflammatory activity.
Linking structure and activity in nonlinear spiking networks
Creators: name: Ocker, Gabriel Koch
name: Josić, Krešimir
name: Shea-Brown, Eric
name: Buice, Michael A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: Recent experimental advances are producing an avalanche of data on both neural connectivity and neural activity. To take full advantage of these two emerging datasets we need a framework that links them, revealing how collective neural activity arises from the structure of neural connectivity and intrinsic neural dynamics. This problem of {\it structure-driven activity} has drawn major interest in computational neuroscience. Existing methods for relating activity and architecture in spiking networks rely on linearizing activity around a central operating point and thus fail to capture the nonlinear responses of individual neurons that are the hallmark of neural information processing. Here, we overcome this limitation and present a new relationship between connectivity and activity in networks of nonlinear spiking neurons by developing a diagrammatic fluctuation expansion based on statistical field theory. We explicitly show how recurrent network structure produces pairwise and higher-order correlated activity, and how nonlinearities impact the networks' spiking activity. Our findings open new avenues to investigating how single-neuron nonlinearities---including those of different cell types---combine with connectivity to shape population activity and function.
description: We were recently made aware of an error in this article: in Figure 13, we neglected several one-loop contributions to the two-point correlation. For the networks we studied here, these contributions are small (third order in the coupling strength). For further discussion, please see the correction note appended to the end of the article
Turbulent thermal diffusion in strongly stratified turbulence: theory and experiments
Creators: name: Amir, G.
name: Bar, N.
name: Eidelman, A.
name: Elperin, T.
name: Kleeorin, N.
name: Rogachevskii, I.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Turbulent thermal diffusion is a combined effect of the temperature stratified turbulence and inertia of small particles. It causes the appearance of a non-diffusive turbulent flux of particles in the direction of the turbulent heat flux. This non-diffusive turbulent flux of particles is proportional to the product of the mean particle number density and the effective velocity of inertial particles. The theory of this effect has been previously developed only for small temperature gradients and small Stokes numbers (Phys. Rev. Lett. {\bf 76}, 224, 1996). In this study a generalized theory of turbulent thermal diffusion for arbitrary temperature gradients and Stokes numbers has been developed. The laboratory experiments in the oscillating grid turbulence and in the multi-fan produced turbulence have been performed to validate the theory of turbulent thermal diffusion in strongly stratified turbulent flows. It has been shown that the ratio of the effective velocity of inertial particles to the characteristic vertical turbulent velocity for large Reynolds numbers is less than 1. The effective velocity of inertial particles as well as the effective coefficient of turbulent thermal diffusion increase with Stokes numbers reaching the maximum at small Stokes numbers and decreases for larger Stokes numbers. The effective coefficient of turbulent thermal diffusion also decreases with the mean temperature gradient. It has been demonstrated that the developed theory is in a good agreement with the results of the laboratory experiments.
description: 10 pages, 6 figures, REVTEX4-1
An $\mathfrak{sl}_2$-type tensor category for the Virasoro algebra at central charge $25$ and applications
Creators: name: McRae, Robert
name: Yang, Jinwei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: Category Theory (math.CT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 17B68, 17B69, 18M15, 81R10

description: Let $\mathcal{O}_{25}$ be the vertex algebraic braided tensor category of finite-length modules for the Virasoro Lie algebra at central charge $25$ whose composition factors are the irreducible quotients of reducible Verma modules. We show that $\mathcal{O}_{25}$ is rigid and that its simple objects generate a semisimple tensor subcategory that is braided tensor equivalent to an abelian $3$-cocycle twist of the category of finite-dimensional $\mathfrak{sl}_2$-modules. We also show that this $\mathfrak{sl}_2$-type subcategory is braid-reversed tensor equivalent to a similar category for the Virasoro algebra at central charge $1$. As an application, we construct a simple conformal vertex algebra which contains the Virasoro vertex operator algebra of central charge $25$ as a $PSL_2(\mathbb{C})$-orbifold. We also use our results to study Arakawa's chiral universal centralizer algebra of $SL_2$ at level $-1$, showing that it has a symmetric tensor category of representations equivalent to $\mathrm{Rep}\,PSL_2(\mathbb{C})$. This algebra is an extension of the tensor product of Virasoro vertex operator algebras of central charges $1$ and $25$, analogous to the modified regular representations of the Virasoro algebra constructed earlier for generic central charges by I. Frenkel-Styrkas and I. Frenkel-M. Zhu.
description: 39 pages, in this version, reference added for Arakawa's earlier construction of chiral universal centralizer algebra, also further results added on uniqueness and representation theory of vertex algebra extensions of the c = 25 Virasoro algebra
Advanced Analysis of Quantum Contextuality in a Psychophysical Double-Detection Experiment
Creators: name: Cervantes, Víctor H.
name: Dzhafarov, Ehtibar N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Probability (math.PR)
subject: Quantum Physics (quant-ph)
subject: FOS: Biological sciences
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 81P13, 81Q99, 60A99

description: The results of behavioral experiments typically exhibit inconsistent connectedness, i.e., they violate the condition known as "no-signaling," "no-disturbance," or "marginal selectivity." This prevents one from evaluating these experiments in terms of quantum contextuality if the latter understood traditionally (as, e.g., in the Kochen-Specker theorem or Bell-type inequalities). The Contextuality-by-Default (CbD) theory separates contextuality from inconsistent connectedness. When applied to quantum physical experiments that exhibit inconsistent connectedness (due to context-dependent errors and/or signaling), the CbD computations reveal quantum contextuality in spite of this. When applied to a large body of published behavioral experiments, the CbD computations reveal no quantum contextuality: all context-dependence in these experiments is described by inconsistent connectedness alone. Until recently, however, experimental analysis of contextuality was confined to so-called cyclic systems of binary random variables. Here, we present the results of a psychophysical double-detection experiment that do not form a cyclic system: their analysis requires that we use a recent modification of CbD, one that makes the class of noncontextual systems more restricted. Nevertheless our results once again indicate that when inconsistent connectedness is taken into account, the system exhibits no contextuality. KEYWORDS: contextuality, cyclic systems, double-detection, inconsistent connectedness, psychophysics.
description: 10 pp, contains experimental data. To be published in Journal of Mathematical Psychology
Lepra e invisibilidad social en Cartagena, 1888-1909. El problema de la medicalización
Creators: name: Martínez Hincapie, Wilmar Alexander
Publisher: name: Universidad de Cartagena
Year: 2007
Subjects: Leprosos - Aspectos sociales
Leproso -1888-1909 - Medicamentos
Enfermedades transmisibles - Aspectos sociales
Cartagena - Historia social

description: Tesis (Historiador) -- Universidad de Cartagena. Facultad de Ciencias Humanas. Programa de Historia, 2007
description: En este trabajo intentamos analizar las diferentes dinámicas sociales, económicas, políticas y por qué no, morales, que se desarrollaron en la ciudad alrededor del problema de la lepra entre 1888 y 1909. La periodicidad sugerida para este trabajo, parte de una lógica coyuntural enmarcada dentro de un proceso de medicalización de la ciudad, que tiene como primer impulso, la fundación de la sociedad de medicina y ciencias sociales de Bolívar
Attaining a strong-field QED signal at laser-electron colliders with optimized focusing
Creators: name: Olofsson, Christoffer
name: Gonoskov, Arkady
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Colliding bunches of high-energy electrons with intense laser pulses provides a basis for studying strong-field QED processes enabled by high values of quantum non-linearity parameter $χ$. Nevertheless, the signal deconvolution is intricate due to probabilistic nature of the processes and shot-to-shot variation of the impact parameter, which disfavors the use of tight focusing. We propose a concept for distinguishing the signal of high-$χ$ emissions that enables the use of optimal focusing to attain the highest $χ\approx 5.25 \left(\varepsilon / (\text{1 GeV})\right)\left(P/(\text{1 PW})\right)^{1/2}\left((\text{1 }μ\text{m})/λ\right)$ for a given electron energy $\varepsilon$, laser power $P$ and wavelength $λ$. Reaching such $χ$ with f/2 focusing requires more than 10 times higher power.
title: Child migration and educational progression in the Savannah regions of Ghana
title: Implications for planning and spatial development
titleType: AlternativeTitle
Creators: name: Tamanja, Emmanuel M. J.
Publisher: name: Technische Universität Dortmund
Year: 2014
Subjects: subject: Migration
subject: Planning and development
subject: 710

description: Child migration in Ghana has moved beyond the concerns of individual child migrants and their families, to one of national development concerns. Streets, pavements and other public spaces in the cities and towns - especially Accra - are flooded with children engaged in various activities. These children are not only a nuisance to road users and city authorities, but exert pressure on social amenities as well as threat to security. However, little is known about the education of children when they migrate. This requires research attention, to shed light on the phenomenon. In this study, I explore the motivations for migration of children from Bongo district to Accra in Ghana and examine how migration influences their pursuit of basic education. The study employed a mixed methods design involving observation, interviews with 35 child migrants, community discussions, interviews with experts and schedule officers of government and non-governmental organisations working on issues of child migration. Furthermore, questionnares were administred to 490 (250 migrant and 240 non-migrant) children in 10 schools in the district and their academic performance data obtained and analysed, using Mann-Whitney U Test, to find differences in their performance. Poverty, peer influence and pursuit of education emerged as major motivational factors, while non-migrant school children performed relatively better than their migrant counterparts. Nevertheless, the overall effects of migration on education was found to be mixed. Whereas it was negative or positive for some, others pursued apprenticeship as an alternative. I conclude that children in deprived regions migrate to escape unfavourable living conditions and to accumulate wealth in urban areas. However, involvement in migration has negative effects on performance in class with the likelihood of stalling progress in education. Furthermore, I recommend affirmative action by national and local government actors, in order to reduce poverty in rural areas while confronting the daunting challenges in rural schools to improve access and quality.
AMRA*: Anytime Multi-Resolution Multi-Heuristic A*
Creators: name: Saxena, Dhruv Mauria
name: Kusnur, Tushar
name: Likhachev, Maxim
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Heuristic search-based motion planning algorithms typically discretise the search space in order to solve the shortest path problem. Their performance is closely related to this discretisation. A fine discretisation allows for better approximations of the continuous search space, but makes the search for a solution more computationally costly. A coarser resolution might allow the algorithms to find solutions quickly at the expense of quality. For large state spaces, it can be beneficial to search for solutions across multiple resolutions even though defining the discretisations is challenging. The recently proposed algorithm Multi-Resolution A* (MRA*) searches over multiple resolutions. It traverses large areas of obstacle-free space and escapes local minima at a coarse resolution. It can also navigate so-called narrow passageways at a finer resolution. In this work, we develop AMRA*, an anytime version of MRA*. AMRA* tries to find a solution quickly using the coarse resolution as much as possible. It then refines the solution by relying on the fine resolution to discover better paths that may not have been available at the coarse resolution. In addition to being anytime, AMRA* can also leverage information sharing between multiple heuristics. We prove that AMRA* is complete and optimal (in-the-limit of time) with respect to the finest resolution. We show its performance on 2D grid navigation and 4D kinodynamic planning problems.
description: Published at IEEE International Conference on Robotics and Automation (ICRA), 2022. Code available at https://github.com/dhruvms/amra
T-Duality from super Lie n-algebra cocycles for super p-branes
Creators: name: Fiorenza, Domenico
name: Sati, Hisham
name: Schreiber, Urs
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Algebraic Topology (math.AT)
subject: K-Theory and Homology (math.KT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We compute the $L_\infty$-theoretic dimensional reduction of the F1/D$p$-brane super $L_\infty$-cocycles with coefficients in rationalized twisted K-theory from the 10d type IIA and type IIB super Lie algebras down to 9d. We show that the two resulting coefficient $L_\infty$-algebras are naturally related by an $L_\infty$-isomorphism which we find to act on the super $p$-brane cocycles by the infinitesimal version of the rules of topological T-duality and inducing an isomorphism between $K^0$ and $K^1$, rationally. In particular this is a derivation of the Buscher rules for RR-fields (Hori's formula) from first principles. Moreover, we show that these $L_\infty$-algebras are the homotopy quotients of the RR-charge coefficients by the "T-duality Lie 2-algebra". We find that the induced $L_\infty$-extension is a gerby extension of a 9+(1+1) dimensional (i.e. "doubled") T-duality correspondence super-spacetime, which serves as a local model for T-folds. We observe that this still extends, via the D0-brane cocycle of its type IIA factor, to a 10+(1+1)-dimensional super Lie algebra. Finally we observe that this satisfies expected properties of a local model space for F-theory elliptic fibrations.
description: 44 pages; v2: added more discussion of double dimensional reduction via cyclic L-infinity cohomology; v3: added derivation of Buscher rules for RR-fields, expanded on role of curved L-infinity algebras in double dimensional reduction
Use of algebraic dual representations in domain decomposition methods for Darcy flow in 3D domain
Creators: name: Jain, V.
name: Palha, A.
name: Gerritsma, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: In this work we use algebraic dual representations in conjunction with domain decomposition methods for Darcy equations. We define the broken Sobolev spaces and their finite dimensional counterparts. In addition, a global trace space is defined that connects the solution between the broken spaces. Use of dual representations results in a sparse metric free representation of the constraint on divergence of velocity, the pressure gradient term and on the continuity constraint across the sub domains. To demonstrate this, we solve two test cases: i) manufactured solution case, and ii) industrial benchmark reservoir modelling problem SPE10. The results demonstrate that the domain decomposition scheme, although with more unknowns, requires less memory and simulation time as compared to the continuous Galerkin formulation.
Lanthanide tags for paramagnetic NMR spectroscopy
Creators: name: Lee, Michael David
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: The site-specific incorporation of paramagnetic lanthanide ions into proteins produces a number of unique effects that manifest in the proteins’ NMR spectra, including paramagnetic relaxation enhancement, residual dipolar coupling and pseudo-contact shifts. Measurement of these effects yields powerful long-range distance and angular restraints that can aid structural investigations. In order to utilize these restraints in a wide range of proteins, synthetic lanthanide-binding tags(LBTs) capable of site-specific conjugation to proteins have been developed. This thesis describes the synthesis and assessment of nine new macrocyclic LBTs (including two pairs of enantiomeric tags) for paramagnetic NMR spectroscopy of biomolecules. Each cyclen-based LBT forms highly stable, polydenate lanthanide chelates, eliminating the need for the addition of free paramagnetic metal ions to protein samples. Factors such as the size, rigidity, hydrophobicity and method of conjugation were taken into consideration with each LBT design, resulting in the generation of a panel of high-performance tags suitable for a range of biological applications. All of the tags are designed for conjugation to cysteine residues via disulfide bond formation, except for one incorporating an α-bromoacetamide group, which generates a more stable thioether linkage. Two stand-out LBTs – the enantiomers C7 and C8 – feature very short linkers that restrict their mobility relative to the bound protein, resulting in large paramagnetic effects. Both tags were utilized in paramagnetic NMR-based structural studies of the folate biosynthesis enzyme, 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase, helping to establish important details about the conformation of the loops surrounding the active site. Due to their enantiomeric nature, the tags yielded two independent sets of restraints from a single tagging site.

Awards: Vice-Chancellor's Commendation for Doctoral Thesis in Excellence in 2016.
Dressed photon-orbital states in a quantum dot: Inter-valley spin resonance
Creators: name: Scarlino, P.
name: Kawakami, E.
name: Jullien, T.
name: Ward, D. R.
name: Savage, D. E.
name: Lagally, M. G.
name: Friesen, Mark
name: Coppersmith, S. N.
name: Eriksson, M. A.
name: Vandersypen, L. M. K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The valley degree of freedom is intrinsic to spin qubits in Si/SiGe quantum dots. It has been viewed alternately as a hazard, especially when the lowest valley-orbit splitting is small compared to the thermal energy, or as an asset, most prominently in proposals to use the valley degree of freedom itself as a qubit. Here we present experiments in which microwave electric field driving induces transitions between both valley-orbit and spin states. We show that this system is highly nonlinear and can be understood through the use of dressed photon-orbital states, enabling a unified understanding of the six microwave resonance lines we observe. Some of these resonances are inter-valley spin transitions that arise from a non-adiabatic process in which both the valley and the spin degree of freedom are excited simultaneously. For these transitions, involving a change in valley-orbit state, we find a tenfold increase in sensitivity to electric fields and electrical noise compared to pure spin transitions, strongly reducing the phase coherence when changes in valley-orbit index are incurred. In contrast to this non-adiabatic transition, the pure spin transitions, whether arising from harmonic or subharmonic generation, are shown to be adiabatic in the orbital sector. The non-linearity of the system is most strikingly manifest in the observation of a dynamical anti-crossing between a spin-flip, inter-valley transition and a three-photon transition enabled by the strong nonlinearity we find in this seemly simple system.
description: 23 pages, 11 figures, supplementary material included
Assessment The Implementation Pracrices Of Project Management Process Group In The Case Of Nekemte-Bure Road Construction Project
Creators: name: Amsal, Ataguad
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2019

description: Project management process and practices are recognized as an important factor in order to achieve better performance of projects. The purpose of the study was to examine the implementing practices of project management process groups (scoping, planning, launching, monitoring and controlling) and project management performance at Nekemte-Bure road construction projects. The target population for this study were client representatives, consultants and contractor teams, the total population was 128.The sampling techniques that the researcher was used censes method. Data was collected from 107 study participants through quantitatively by distributing the questioner paper and qualitatively through interviews. The questionnaire was validated and its internal consistencies were reliable and stable to measure the research results by testing its reliability. The data was processed using statistical package for social science (SPSS, version 20).The quantitative data were analyzed by using descriptive statistical analysis. In descriptive analysis, the data was presented in tabular form and described the situation of the project environments. From the study results, there is a poor implementing practice of project management process, the project is run under the risk of costs overrun and time delay due to poor project management process and practices. Therefore, project manager and team leaders should be taken in to account to ensure that project management process groups are adequately considered and implemented from starting to finish the project work.
Thermal Conductivity and Theory of Inelastic Scattering of Phonons by Collective Fluctuations
Creators: name: Mangeolle, Léo
name: Balents, Leon
name: Savary, Lucile
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the intrinsic scattering of phonons by a general quantum degree of freedom, i.e. a fluctuating "field" $Q$, which may have completely general correlations, restricted only by unitarity and translational invariance. From the induced scattering rates, we obtain the consequences on the thermal conductivity tensor of the phonons. We find that the lowest-order diagonal scattering rate, which determines the longitudinal conductivity, is controlled by two-point correlation functions of the $Q$ field, while the off-diagonal scattering rates involve a minimum of three to four point correlation functions. We obtain general and explicit forms for these correlations which isolate the contributions to the Hall conductivity, and provide a general discussion of the implications of symmetry and equilibrium. We evaluate these two- and four-point correlation functions and hence the thermal transport for the illustrative example of an ordered two dimensional antiferromagnet. In this case the $Q$ field is a composite of magnon operators arising from spin-lattice coupling. A numerical evaluation of the required integrals demonstrates that the results satisfy all the necessary symmetry restrictions but otherwise lead to non-vanishing scattering and Hall effects, and in particular that this mechanism leads to comparable thermal Hall conductivity for thermal currents within and normal to the plane of the antiferromagnetism.
description: 51 pages, including 19 pages of appendices, 10 figures, 6 tables. Companion paper: arXiv:2206.06183
Estudio de factibilidad y comercialización del pan en Cartagena
Creators: name: Espinosa Buelvas, Enith
name: Ortega Puello, Carmen Alicia
Publisher: name: Universidad de Cartagena
Year: 1994
Subjects: Estudio de mercado
Estudios de factibilidad
Estudio financiero

description: Tesis (Administrador de Empresas).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración de Empresas,1994
description: El presente estudio tiene por objeto demostrar la factibilidad del montaje de una panadería en la ciudad de Cartagena, así como conocer los aspectos de comercialización de la industria panificadora de Cartagena.
Absolutely maximally entangled states of seven qubits do not exist
Creators: name: Huber, Felix
name: Gühne, Otfried
name: Siewert, Jens
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Pure multiparticle quantum states are called absolutely maximally entangled if all reduced states obtained by tracing out at least half of the particles are maximally mixed. We provide a method to characterize these states for a general multiparticle system. With that, we prove that a seven-qubit state whose three-body marginals are all maximally mixed, or equivalently, a pure $((7,1,4))_2$ quantum error correcting code, does not exist. Furthermore, we obtain an upper limit on the possible number of maximally mixed three-body marginals and identify the state saturating the bound. This solves the seven-particle problem as the last open case concerning maximally entangled states of qubits.
description: 6 pages, 2 figures, v3: final version
Semiclassical Boltzmann magnetotransport theory in anisotropic systems with a nonvanishing Berry curvature
Creators: name: Suh, Jeonghyeon
name: Park, Sanghyun
name: Min, Hongki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Understanding the transport behavior of an electronic system under the influence of a magnetic field remains a key subject in condensed matter physics. Particularly in topological materials, their nonvanishing Berry curvature can lead to many interesting phenomena in magnetotransport owing to the coupling between the magnetic field and Berry curvature. By fully incorporating both the field-driven anisotropy and inherent anisotropy in the band dispersion, we study the semiclassical Boltzmann magnetotransport theory in topological materials with a nonvanishing Berry curvature. We show that as a solution to the Boltzmann transport equation the effective mean-free-path vector is given by the integral equation, including the effective velocity arising from the coupling between the magnetic field, Berry curvature and mobility. We also calculate the conductivity of Weyl semimetals with an isotropic energy dispersion, and find that the coupling between the magnetic field and Berry curvature induces anisotropy in the relaxation time, showing a substantial deviation from the result obtained assuming a constant relaxation time.
description: 19 pages, 3 figures
Redshift of a photon emitted along the black hole horizon
Creators: name: Toporensky, A.
name: Zaslavskii, O.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work we derive some general features of the redshift measured by radially moving observers in the black hole background. Let observer 1 cross the black hole horizon emitting of a photon while observer 2 crossing the same horizon later receives it. We show that if (i) the horizon is the outer one (event horizon) and (ii) it is nonextremal, received frequency is redshifted. This generalizes previous recent results in literature. For the inner horizon (like in the Reissner-Nordström metric) the frequency is blueshifted. If the horizon is extremal, the frequency does not change. We derive explicit formulas describing the frequency shift in generalized Kruskal- and Lemaitre-like coordinates.
description: 17 pages, no figures. Minor corrections, matches published version
Age Optimal Sampling Under Unknown Delay Statistics
Creators: name: Tang, Haoyue
name: Chen, Yuchao
name: Wang, Jintao
name: Yang, Pengkun
name: Tassiulas, Leandros
Publisher: name: arXiv
Year: 2022
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This paper revisits the problem of sampling and transmitting status updates through a channel with random delay under a sampling frequency constraint \cite{sun_17_tit}. We use the Age of Information (AoI) to characterize the status information freshness at the receiver. The goal is to design a sampling policy that can minimize the average AoI when the statistics of delay is unknown. We reformulate the problem as the optimization of a renewal-reward process, and propose an online sampling strategy based on the Robbins-Monro algorithm. We prove that the proposed algorithm satisfies the sampling frequency constraint. Moreover, when the transmission delay is bounded and its distribution is absolutely continuous, the average AoI obtained by the proposed algorithm converges to the minimum AoI when the number of samples $K$ goes to infinity with probability 1. We show that the optimality gap decays with rate $\mathcal{O}\left(\ln K/K\right)$, and the proposed algorithm is minimax rate optimal. Simulation results validate the performance of our proposed algorithm.
description: Accepted and to appear, IEEE Transactions on Information Theory
Inovação educativa: O ensino e a promoção das línguas africanas nos programas escolares nas zonas libertadas da UNITA em Angola
Creators: name: Jamba, Almerindo Jaka
Publisher: name: Povos e Culturas
Year: 1989

description: Povos e Culturas, v. 4 (1989): Educação em África (1989-1990)
title: Nicht-spezifische, funktionelle und somatoforme Körperbeschwerden in der Allgemeinmedizin. Bio-psycho-soziales Wahrnehmen – Erfassen – Verstehen und Behandeln
Creators: name: Vockner, B.
Publisher: name: German Medical Science GMS Publishing House
Year: 2015
Subjects: subject: Gestaltung des Settings nach bio-psycho-sozialen Gesichtspunkten
subject: Komorbidität- Depression und Angst
subject: nicht-spezifische funktionelle und somatoforme Körperbeschwerden
subject: 610 Medical sciences; Medicine

description: Hintergrund: Nicht-spezifische, somatoforme Körperbeschwerden sind häufig in der primärärztlichen Versorgung anzutreffen. Internationale Studien geben divergierende Daten von 5-38%, je nach Ein und Ausschlusskriterien an. Die Prävalenz der Komorbiditäten Depression[zum vollständigen Text gelangen Sie über die oben angegebene URL]
description: 49. Kongress für Allgemeinmedizin und Familienmedizin
Toward a Holographic Theory for General Spacetimes
Creators: name: Nomura, Yasunori
name: Salzetta, Nico
name: Sanches, Fabio
name: Weinberg, Sean J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study a holographic theory of general spacetimes that does not rely on the existence of asymptotic regions. This theory is to be formulated in a holographic space. When a semiclassical description is applicable, the holographic space is assumed to be a holographic screen: a codimension-1 surface that is capable of encoding states of the gravitational spacetime. Our analysis is guided by conjectured relationships between gravitational spacetime and quantum entanglement in the holographic description. To understand basic features of this picture, we catalog predictions for the holographic entanglement structure of cosmological spacetimes. We find that qualitative features of holographic entanglement entropies for such spacetimes differ from those in AdS/CFT but that the former reduce to the latter in the appropriate limit. The Hilbert space of the theory is analyzed, and two plausible structures are found: a direct sum and "spacetime equals entanglement" structure. The former preserves a naive relationship between linear operators and observable quantities, while the latter respects a more direct connection between holographic entanglement and spacetime. We also discuss the issue of selecting a state in quantum gravity, in particular how the state of the multiverse may be selected in the landscape.
description: 54 pages, 14 figures; version to appear in Phys. Rev. D
Construcción del corpus literario peruano del siglo XXI, a partir de los problemas de difusión editorial
Creators: name: Delgado Del Aguila, Jesús Miguel
Publisher: name: figshare
Year: 2022
Subjects: subject: 220319 Social Philosophy
subject: FOS: Philosophy, ethics and religion
subject: 160806 Social Theory
subject: FOS: Sociology

description: Delgado Del Aguila, Jesús Miguel (2022). «Construcción del corpus literario peruano del siglo XXI, a partir de los problemas de difusión editorial», en: Helios. Trujillo, Perú: Universidad Privada Antenor Orrego. Vol. 6, n.° 1, enero-junio, pp. 29-38. Disponible en https://doi.org/10.5281/zenodo.7015934