cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Generalization of Regular Black Holes in General Relativity to $f(R)$ Gravity
Creators: name: Rodrigues, Manuel E.
name: Fabris, Julio C.
name: Junior, Ednaldo L. B.
name: Marques, Glauber T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we determine regular black hole solutions using a very general $f(R)$ theory, coupled to a non-linear electromagnetic field given by a Lagrangian $\mathcal{L}_{NED}$. The functions $f(R)$ and $\mathcal{L}_{NED}$ are left in principle unspecified. Instead, the model is constructed through a choice of the mass function $M(r)$ presented in the metric coefficients. Solutions which have a regular behaviour of the geometric invariants are found. These solutions have two horizons, the event horizon and the Cauchy horizon. All energy conditions are satisfied in the whole space-time, except the strong energy condition (SEC) which is violated near the Cauchy horizon.
description: Latex file, 11 pages, 5 figures in eps format
A Note on Schwarzschild de Sitter Black Holes in Mimetic $F(R)$ Gravity
Creators: name: Oikonomou, V. K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this brief note we investigate the conditions under which a Schwarzschild de Sitter black hole spacetime is a solution of the mimetic $F(R)$ gravity with Lagrange multiplier and potential. As we demonstrate, the resulting mimetic $F(R)$ gravity is a slight modification of the ordinary $F(R)$ gravity case, however the resulting perturbation equations are not in all cases identical to the ordinary $F(R)$ gravity case. In the latter case, the perturbation equations are identical to the ones corresponding to the Reissner-Nordström anti-de Sitter black hole.
The exact form of the Bohm criterion for a collisional plasma
Creators: name: Tsankov, Tsanko Vaskov
name: Czarnetzki, Uwe
Publisher: name: arXiv
Year: 2016
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A long-standing debate in the literature about the kinetic form of the Bohm criterion is resolved for plasmas with single positive ion species when transport is dominated by charge exchange collisions. The solution of the Boltzmann equation for the ions gives the exact form free of any divergence and contains an additional term that is not included in the classical result. This term includes collisional and geometric effects and leads to a noticeable correction. Further, the question is addressed whether the space charge argument at the bottom of the Bohm criterion can actually lead to a meaningful definition of the transition point between bulk and sheath. The analysis is supported by a numerical model and experiments, showing excellent agreement throughout. As a novelty in diagnostics, the theoretical results allow from the ion velocity distribution function (IVDF), measured at the wall, a reconstruction of the IVDF and the electric field at any point in the plasma. This property is used to reconstruct non-intrusively also the ion density, flow velocity, mean energy and effective temperature and the electron density and temperature as functions of the spatial coordinate and potential. Finally, the fluid equation for ion momentum balance is verified.
description: First version
Mathematikbezogene Beliefs fachfremd unterrichtender Lehrerinnen und Lehrer zu Beginn einer Qualifizierungsmaßnahme
Creators: name: Lünne, Steffen
name: Biehler, Rolf
name: Schüler, Sven
name: Rösken-Winter, Bettina
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2015
Subjects: subject: 510

description: Fachfremd unterrichtende Lehrpersonen rücken verstärkt in den Blick mathematikdidaktischer Forschung: fachfremd erteilter Unterricht ist weniger kognitiv aktivierend (Baumert et al., 2010) und wirkt sich negativ auf Schülerleistungen aus (Richter, Kuhl, Haag & Pant, 2013). Neben Professionswissen haben Überzeugungen einen entscheidenden Einfluss auf die Planung und Gestaltung von Unterricht (vgl. Törner, Rolka, Roesken & Sriraman, 2010). Im Rahmen der Begleitforschung zu einer vom DZLM (www.dzlm.de) getragenen Qualifizierung für fachfremd unterrichtende Lehrpersonen (Lünne & Biehler, 2015) untersuchten wir zu Beginn der Maßnahme die Einstellungen und Überzeugungen Fachfremder zum Lehren und Lernen von Mathematik. Der Fokus dieses Beitrages liegt auf der Beschreibung der Erhebungsinstrumente und erster Ergebnisse.
Klasse trotz Masse am Studienanfang – das Blended Learning Konzept e:t:p:M@Math
Creators: name: Mundt, Fabian
name: Hartmann, Mutfried
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2015
Subjects: subject: 510

description: Im Wintersemester 2014/2015 verzeichnete das Statistische Bundesamt 2,7 Millionen Studierende – ein Novum in der Geschichte der Bundesrepublik Deutschland (vgl. SB 2015). Bedenkt man, dass es noch vor zehn Jahren weit weniger als zwei Millionen Studierende gab (vgl. Bildungsbericht 2014), wird das Ausmaß dieser Bildungsexpansion deutlich. Die Universität hat sich zur Massenuniversität mit einer sehr heterogenen Studierendenschaft und mit einer entsprechend ungünstigen Betreuungsrelation gewandelt (vgl. Himpsl 2014). Insbesondere für teilnehmerstarke Einführungsveranstaltungen ergeben sich daraus problematische Voraussetzungen. Die Qualität des Studiums leidet massiv; der Reformbedarf ist unumstritten (vgl. Asdonk u.a. 2013). Da sich an dieser Ausgangslage in absehbarer Zeit wenig ändern wird (vgl. Dräger, Friedrich & Müller-Eiselt 2014: 6), sind innovative Lehr-Lern- Konzepte gefragt. Vielversprechend sind vor allem solche Ansätze, die herkömmliche Präsenzveranstaltungen mit den Möglichkeiten digitaler (Internet-) Technologien verschränken (vgl. HRK 2014). Ein Konzept, das besonderen Wert auf die Integration präsenzbasierter und digitaler Angebote legt, ist e:t:p:M.
Campodea (Campodea) augens Silvestri 1936
Creators: name: Sendra, Alberto
name: Reboleira, Ana Sofia P. S.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplura
Campodeidae
Campodea
Campodea augens

description: Campodea (Campodea) augens Silvestri, 1936
Campodea (Campodea) augens Silvestri, 1936: 529, tables IX 1–10, X 11–17.
Diagnosis (Silvestri 1936; Condé 1953a; Rusek 1964)
Body length 4.0–5.0 mm; epicuticle with microdenticles; clothing setae short with small apical barbs; antennae with 25 antennomeres; sensillum of third antennomere in dorsal position; middle sized, robust notal macrosetae covered with short barbs; lp mesonotal longer than lp metanotal; short thin pine cone notal marginal; setae one trochanteral sensillum; 1+1 la, 1+1 lp macrosetae on VI–VII urotergites; 3+3 lp on VIII urotergite and 5+5 lp on IX abdominal segment; cerci longer than body with 10 articles covered in smooth thin macrosetae or with distal barb and sparse clothing setae.
Habitat and distribution
Soil-dwelling species that inhabits the upper layer of forest soil. It is distributed from the Alps to the Carpathian Mountains (Paclt 1951, 1954, 1956; Rusek 1964, 1965c; Condé 1984) and also in southern Serbia (Blesić 1984: D0358). The records for the Western Caucasus (Rusek 1965a) and the Pontic Mountains (Sendra et al. 2006) should be revised, along with a study of intraspecific variability across its distribution areas.
description: Published as part of Sendra, Alberto & Reboleira, Ana Sofia P. S., 2020, Euro-Mediterranean fauna of Campodeinae (Campodeidae, Diplura), pp. 1-130 in European Journal of Taxonomy 728 on page 29, DOI: 10.5852/ejt.2020.728.1181, http://zenodo.org/record/4316883
Educación y movilidad social en Cartagena entre 1950-1976
Creators: name: Arellano Cartagena, William
Publisher: name: Universidad de Cartagena
Year: 2012
Subjects: Educación - Investigaciones
Educación - Movilidad social - Caribe (Región, Colombia) 1950 - 1976
Educación - Movilidad social - Caribe (Región, Colombia) - Siglos XIX y XX
Educación - Historia social - Caribe (Región, Colombia) - Siglos XIX Y XX

description: Tesis (Doctor en Ciencias de la Educación) -- Universidad de Cartagena. Línea de Investigación: Historia Social de la Educación en el Caribe Siglo XIX – XX. Educación Superior: Currículo, Gestión y Evaluación. Doctorado en Ciencias de la Educación, 2012
description: En la tesis se explican los factores estructurales y subjetivos asociados a la relación entre educación y movilidad social en Cartagena entre 1950 y 1976.
Verständnis mathematischer Fachbegriffe in der Studieneingangsphase
Creators: name: Nagel, Kathrin
name: Reiss, Kristina
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2015
Subjects: subject: 510

description: Beim Übergang von der Schule an die Universität treten insbesondere in mathematisch-naturwissenschaftlich geprägten Studiengängen Schwierigkeiten auf. Als besonders herausfordernd wird dabei die Mathematik angesehen. Gründe hierfür sind v. a. die Unterschiede zwischen Schul- und Hochschulmathematik. Besonders das mathematische Argumentieren gewinnt in der wissenschaftlichen Mathematik an Bedeutung, während das Anwenden von Kalkülen eher in den Hintergrund tritt (Heinze & Reiss, 2004). Um die Schwierigkeiten beim mathematischen Argumentieren zu untersuchen, ist es notwendig, die dazu notwendigen Fähigkeiten zu analysieren. Neben Metawissen über Beweisprozesse und Logik sind Problemlösekompetenz und elaboriertes Fachwissen Voraussetzungen für mathematische Argumentation (Brunner, 2014). Mit der Elaboration von Fachwissen geht ferner ein Mindestmaß an Verständnis mathematischer Inhalte und Begriffe einher. Die Untersuchung des mathematischen Begriffsverständnisses von Studienanfängern soll daher im Fokus des vorliegenden Beitrags liegen.
MPEC 2023-S226 : DAILY ORBIT UPDATE (2023 September 26)
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Estudio evaluativo del distrito de riego de María La Baja durante el periodo de 1980 - 1985
Creators: name: Pajaro Avila, Hernan
name: Muñoz Mendoza, Julian
Publisher: name: Universidad de Cartagena
Year: 1987
Subjects: Agricultura - Aspectos económicos
María La Baja - Bolívar - Aspectos socioeconómicos

description: Tesis (Economista).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Economía, 1987.
description: El presente trabajo tiene por objeto estudiar si durante la primera mitad de la década de 1980 él ha producido algún avance en los ámbitos social y económico entre los habitantes de la región que comprende el distrito de riego de Maria La Baja.
Stabilizing the Hexagonal Close Packed Structure of Hard Spheres with Polymers : Phase diagram, Structure, and Dynamics
Creators: name: Edison, John R
name: Dasgupta, Tonnishtha
name: Dijkstra, Marjolein
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study the phase behaviour of a binary mixture of colloidal hard spheres and freely-jointed chains of beads using Monte Carlo simulations. Recently Panagiotopoulos and coworkers predicted [Nat. Commun. 5, 4472 (2014)] that the hexagonal close packed (HCP) structure of hard spheres can be stabilized in such a mixture due to the interplay between polymer and the void structure in the crystal phase. Their predictions were based on estimates of the free-energy penalty for adding a single hard polymer chain in the HCP and the competing face centered cubic (FCC) phase. Here we calculate the phase diagram using free-energy calculations of the full binary mixture and find a broad fluid-solid coexistence region and a metastable gas-liquid coexistence region. For the colloid-monomer size ratio considered in this work, we find that the HCP phase is only stable in a small window at relatively high polymer reservoir packing fractions, where the coexisting HCP phase is nearly close packed. Additionally we investigate the structure and dynamic behaviour of these mixtures.
description: 8 pages, 5 figures
Decision Trees: Modeling with fast intuition and slow, deliberate analysis
Creators: name: Darveau, Peter
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2023
Subjects: ethics
psychology
machine learning
AI
decision trees
AI in research

description: The Dual Nature of Decision Trees Decision trees demonstrate a fascinating duality between human intuition and mathematical optimization. Psychologists like Kahneman and Tversky revealed how people rely on mental shortcuts and biased, heuristic-based thinking. This mirrors how decision trees use simple, hierarchical branching based on key features - just like our minds categorize objects using decisive traits. Yet decision trees are also rigorously constructed by calculating metrics like information gain that maximize analytical power. This parallels the structured analysis of rational thinking, optimizing the tree mathematically. Supported by various works by D. Kahneman, Busemeyer et al., and researchers at the university of Ottawa, this duality gives decision trees their interpretability and versatility. The visual tree structure appeals to intuitive pattern recognition, while optimized construction exploits powerful analytical techniques. Understanding this fusion between intuitive shortcuts and calculated reasoning is key to advancing decision tree capabilities and addressing their ethical and regulated use in AI applications.
The discretised lognormal and hooked power law distributions for complete citation data: Best options for modelling and regression
Creators: name: Thelwall, Mike
Publisher: name: arXiv
Year: 2016
Subjects: subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: Identifying the statistical distribution that best fits citation data is important to allow robust and powerful quantitative analyses. Whilst previous studies have suggested that both the hooked power law and discretised lognormal distributions fit better than the power law and negative binomial distributions, no comparisons so far have covered all articles within a discipline, including those that are uncited. Based on an analysis of 26 different Scopus subject areas in seven different years, this article reports comparisons of the discretised lognormal and the hooked power law with citation data, adding 1 to citation counts in order to include zeros. The hooked power law fits better in two thirds of the subject/year combinations tested for journal articles that are at least three years old, including most medical, life and natural sciences, and for virtually all subject areas for younger articles. Conversely, the discretised lognormal tends to fit best for arts, humanities, social science and engineering fields. The difference between the fits of the distributions is mostly small, however, and so either could reasonably be used for modelling citation data. For regression analyses, however, the best option is to use ordinary least squares regression applied to the natural logarithm of citation counts plus one, especially for sets of younger articles, because of the increased precision of the parameters.
description: Thelwall, M. (in press). The discretised lognormal and hooked power law distributions for complete citation data: Best options for modelling and regression. Journal of Informetrics
IL-33 mediates multi-walled carbon nanotube (MWCNT)-induced airway hyper-reactivity via the mobilization of innate helper cells in the lung
Creators: name: Beamer, Celine A.
name: Girtsman, Teri A.
name: Seaver, Benjamin P.
name: Finsaas, Krissy J.
name: Migliaccio, Christopher T.
name: Perry, Victoria K.
name: Rottman, James B.
name: Smith, Dirk E.
name: Holian, Andrij
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Allergic asthma is a chronic inflammatory disorder of the airway associated with bronchial obstruction, airway hyper-reactivity (AHR), and mucus production. The epithelium may direct and propagate asthmatic-like responses. Central to this theory is the observation that viruses, air pollution, and allergens promote epithelial damage and trigger the generation of IL-25, IL-33, and TSLP via innate pathways such as TLRs and purinergic receptors. Similarly, engineered nanomaterials promote a Th2-associated pathophysiology. In this study, we tested the hypothesis that instillation of multi-walled carbon nanotubes (MWCNT) impair pulmonary function in C57Bl/6 mice due to the development of IL-33-dependent Th2-associated inflammation. MWCNT exposure resulted in elevated levels of IL-33 in the lavage fluid (likely originating from airway epithelial cells), enhanced AHR, eosinophil recruitment, and production of Th2-associated cytokines and chemokines. Moreover, these events were dependent on IL-13 signaling and the IL-33/ST2 axis, but independent of T and B cells. Finally, MWCNT exposure resulted in the recruitment of innate lymphoid cells. Collectively, our data suggest that MWCNT induce epithelial damage that results in release of IL-33, which in turn promotes innate lymphoid cell recruitment and the development of IL-13-dependent inflammatory response.
Computeralgebrasysteme und mathematische Grundfähigkeiten.
Creators: name: Neumann, Robert
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2015
Subjects: subject: 510

description: Computeralgebrasysteme (CAS) im Schulunterricht waren in der Vergangenheit bereits Gegenstand von verschiedenen Forschungsprojekten. Hier seien exemplarisch der Bayerische Modellversuch M3 (Weigand & Bichler 2010) und CAliMERO (Ingelmann 2008) genannt. Bei diesen Untersuchungen handelte es um eine „klassische“ Interventionsstudie (M3) bzw. um ein mehrjähriges Projekt, in dessen Rahmen der Mathematikunterricht mit Technologieeinsatz evaluiert wurde (CAliMERO).
Superresolution Microscopy of the Volume Phase Transition of pNIPAM Microgels
Creators: name: Conley, Gaurasundar Marc
name: Nojd, Söfi
name: Braibanti, Marco
name: Schurtenberger, Peter
name: Scheffold, Frank
Publisher: name: arXiv
Year: 2015
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Hierarchical polymer structures such as pNIPAM microgels have been extensively studied for their ability to undergo significant structural and physical transformations that can be controlled by external stimuli such as temperature, pH or solvent composition. However, direct three-dimensional visualization of individual particles in situ have so far been hindered by insufficient resolution, with optical microscopy, or contrast, with electron microscopy. In recent years superresolution microscopy techniques have emerged that in principle can provide nanoscopic optical resolution. Here we report on the in-situ superresolution microscopy of dye-labeled submicron sized pNIPAM microgels revealing the internal microstructure during swelling and collapse of individual particles. Using direct STochastic Optical Reconstruction Microscopy (dSTORM) we demonstrate a lateral optical resolution of 30nm and an axial resolution of 60nm.
description: 7 pages, 5 figures
Análisis de la cadena de suministro en la Distribuidora Tropical de Bolívar S.A. "Plan de acción para su mejoramiento"
Creators: name: Gil Giraldo, Sandra Liliana
name: Lefranc Tarra, Lissette
Publisher: name: Universidad de Cartagena
Year: 2005
Subjects: Servicio al cliente
Mercadeo de servicio

description: Tesis (Administrador Industrial) -- Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración Industrial, 2005
description: La cadena de suministro es el conjunto de elementos enlazados de una organización logística, basada especialmente en la planificación de la demanda, el aprovisionamiento, almacenamiento, stock y la distribución productos y/o servicio. La administración de la cadena de suministro, es fundamental en toda empresa que quiera mantener sincronizado e integrado todo el flujo de información, productos, y procesos desde sus proveedores hasta clientes finales, ya que esto les va a permitir trabajar de forma eficiente en todos y cada uno de los eslabones de la cadena y le permitirá asegurar que todo lo requerido para su normal funcionamiento se encuentre disponible en modo, tiempo y lugar. Lograr la eficiencia en la cadena de suministro es fundamental en toda empresa, pues de esta forma podrá obtener beneficios relacionados con la planificación de la demanda, la gestión del aprovisionamiento, gestión de stock, inventarios, distribución y servicio al cliente. Para esto se hace necesario analizar todos estos aspectos y la forma como se están desarrollando, dentro de la empresa, de tal forma que se puedan tomar acciones tendientes a ser más eficiente en todo el proceso del suministro. En la distribuidora Tropical de Bolívar, con el fin de superar algunas deficiencias presentadas en su cadena de suministro se hizo necesario la realización del análisis de la cadena de suministro, el cual se detalla en este documento.
Automotive radar using IEEE 802.11p signals
Creators: name: Mazher, Khurram Usman
name: 0000-0001-8760-391X
Publisher: name: The University of Texas at Austin
Year: 2019
Subjects: Automotive radar
DSRC
CRLB
Matching pursuit

description: Autonomous vehicles have led to a surge in research on automotive radar both in academia and industry during the last few years. In this report, we develop a framework for using the dedicated short range communication (DSRC) waveform for the purposes of automotive radar. Our approach operates on the frequency domain channel estimates generated by the OFDM physical layer used in DSRC. We consider a two path channel model, with the first cluster corresponding to direct signal interference and the second cluster corresponding to the signal reflected from the target. The target ranging, direction of arrival and velocity information is encoded in the parameters of the reflected path. We estimate the parameters of the direct and reflected path using a variant of least squares matching pursuit algorithm by exploiting their relative power difference. The performance of the algorithm is evaluated through numerical simulations assuming low power omnidirectional 5 dBi antennas, Swerling type 0 and type 3 target models, 10 MHz transmission bandwidth and different analog-to-digital quantization resolutions. Simulations results show sub-meter accuracy in location estimation for a significant range of target distances. The results are also compared with the Cramer-Rao lower bound which is a theoretical performance benchmark.
Solar neutrino interactions with liquid scintillators used for double beta decay experiments
Creators: name: Ejiri, Hiroyasu
name: Zuber, Kai
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Solar neutrinos interact with double beta decay detectors (DBD) and hence will contribute to backgrounds (BG) for DBD experiments. Background contributions due to solar neutrinos are evaluated for their interactions with atomic electrons and nuclei in liquid scintillation detectors used for DBD experiments. They are shown to be serious backgrounds for high sensitivity DBD experiments to search for the Majorana neutrino masses in the inverted and normal hierarchy regions.
Tatiana Bilbao. Vivienda social en la cultura mexicana
Creators: name: Martínez Domínguez, Cecilia
Publisher: name: Zenodo
Year: 2024
Subjects: Vivienda Social
México
Tatiana Bilbao
Social Housing

description: Trabajo Fin de Grado. Universidade da Coruña. Escuela Técnica Superior de Arquitectura. Curso 2023-2024 
description: [Resumen] 

La vivienda social desempeña un papel fundamental en la construcción de sociedades justas y equitativas en México, donde la desigualdad habitacional representa un desafío significativo. Dentro del panorama contemporáneo en diseño de vivienda social, Tatiana Bilbao destaca por centrarse en las personas y en la sostenibilidad dentro de un contexto tan complejo. Esta investigación se centra en el análisis de su obra e impacto en la vivienda social en México. Se analizan los proyectos de vivienda social diseñados por la arquitecta, en los que, con presupuestos y medios muy limitados, logra crear viviendas adaptadas a sus habitantes de forma sostenible, al emplear recursos locales y diseños inteligentes. Además, tiene en cuenta los cambios que puede demandar una vivienda con el tiempo y crea proyectos ampliables y modificables. Para contextualizar su trabajo, se realiza una revisión bibliográfica exhaustiva, situándola en el marco histórico y teórico de la vivienda social en México. 
description: [Abstract] 

Social housing plays a fundamental role in building fair and equitable societies in Mexico, where housing inequality represents a significant challenge. Within the contemporary outlook of social housing design, Tatiana Bilbao stands out for focusing on people and sustainability in such a complex context. This research focuses on the analysis of her work and impact on social housing in Mexico. The social housing projects designed by the architect are analyzed, in which, she manages to create houses adapted to its inhabitants in a sustainable way, with very limited budgets and means, by using local resources and intelligent designs. In addition, she bears in mind the changes that a home may require over time and creates expandable and modifiable projects. An exhaustive bibliographic review is carried out to contextualize their work, placing her in the historical and theoretical framework of social housing in Mexico.
Oiconomy Pricing - Real price of ground cinnamon from Indonesia
Creators: name: Verschuren, Evert-Jan
name: Croes, Pim
name: Vermeulen, Walter J.V.
name: Walker, Anna
Publisher: name: Zenodo
Year: 2023
Subjects: Full Cost Accounting
Sustainability Assessment
Oiconomy Pricing
Sustainability
LCA
sLCA

description: Verstegen is a spices & herbs manufacturer from the Netherlands. Verstegen sources broken and cleaned cinnamon bark from Kerinci, Sumatera, Indonesia. The cassia cinnamon tree is grown in a remote forest setting by smallholders and sold to local collectors. It takes 15 to 25 years to grow cinnamon. To harvest the cinnamon, the whole three, will be cut down to strip the bark of the trunk. Verstegen initiated a crop diversification project with their local partner to overcome the first 5 to 10 years after the trees have been harvested. The case study focesses onnthe inpacts of this mode of production.
Estudio socioeconomico del municipio de Hatillo de Loba
Creators: name: Casseres Cuadro, Enrique Luis
name: Muentes Julio, Jacinta Colombia
Publisher: name: Universidad de Cartagena
Year: 1996
Subjects: Estudio socioeconómico - Municipio de Hatillo de Loba - Bolivar
Hatillo de Loba - Bolívar - Aspectos económicos
Hatillo de Loba - Bolívar - Aspectos sociales

description: Tesis (Economista) -- Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Economía. 1996.
description: El presente estudio tiene por objeto identificar las características sociales y económicas del Municipio de Hatillo de Loba-Bolivar con el fin de presentar un diagnostico del nivel general de vida de la población, el cual servirá como base a las autoridades municipales y nacionales para realizar los respectivos planes simplificados de desarrollo.
Neues zum Umkehrfehler in der elementaren Algebra
Creators: name: Oldenburg, Reinhard
name: Henz, Diana
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2015
Subjects: subject: 510

description: Der Umkehrfehler in der elementaren Algebra wird seit über 30 Jahren studiert. Studien zeigen, dass ein konstant hoher Anteil an Lernenden in allen Altersstufen diesem Fehler beim Aufstellen von Gleichungen begeht. Zur Erklärung wurden einige Theorien entwickeln. Wir vermuten aufgrund von Testauswertung vor allem eine Verwechslung von Attributen und Operationen als Ursache.
Epistemic Borderwork: Violent Pushbacks, Refugees, and the Politics of Knowledge at the EU Border
Creators: name: Davies, Thom
name: Isakjee, Arshad
name: Obradovic-Wochnik, Jelena
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: Cancer
subject: Science Policy

description: Borders are sites of epistemic struggle. Focusing on the illegal tactic of the “pushback,” which is routinely deployed by state authorities to forcefully expel asylum seekers from European Union territory without due process, this article explores the uneven politics of knowledge that helps to support or unsettle this clandestine border violence. Drawing on long-term qualitative research on the Croatia–Bosnia border, including interviews with pushback survivors and activists, as well as a database of border violence reports, we explore the competing truth claims and epistemologies that help to conceal, or counter, the pushback regime. Informed by postcolonial perspectives and contributing to political geographies of violence, we argue that “epistemic violence” (Spivak 1988) is a central feature of contemporary borders. We propose that epistemic borderwork is regularly used by state authorities to silence unwanted voices, undermine insurgent perspectives, and stifle the capacity of refugees to draw attention to their own mistreatment. In opposition to this injustice, activists are documenting, mapping, and archiving pushback survivor testimony to construct a counternarrative of refusal, which subverts the harmful knowledge claims of state authorities. In doing so, refugees and activists create epistemic friction, which helps to resist the ontological violence of borders, and “pushes back” against the pushback regime.
Pan-Chromatic observations of the Recurrent Nova LMC 2009a (LMC 1971b)
Creators: name: Bode, M. F.
name: Darnley, M. J.
name: Beardmore, A. P.
name: Osborne, J. P.
name: Page, K. L.
name: Walter, F. M.
name: Krautter, J.
name: Melandri, A.
name: Ness, J. -U.
name: O'Brien, T. J.
name: Orio, M.
name: Schwarz, G. J.
name: Shara, M. M.
name: Starrfield, S.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Nova LMC 2009a is confirmed as a Recurrent Nova (RN) from positional coincidence with nova LMC 1971b. The observational data set is one of the most comprehensive for any Galactic or extragalactic RN: optical and near-IR photometry from outburst until over 6 years later; optical spectra for the first 6 months, and Swift satellite Ultraviolet and X-ray observations from 9 days to almost 1 year post-outburst. We find $M_V = -8.4\pm0.8_{\mathrm{r}}\pm0.7_{\mathrm{s}}$ and expansion velocities between 1000 and 4000 km s$^{-1}$. Coronal line emission before day 9 indicates shocks in the ejecta. Strengthening of He II $λ$4686 preceded the emergence of the Super-Soft Source (SSS) in X-rays at $\sim63-70$ days, which was initially very variable. Periodic modulations, $P=1.2$ days, most probably orbital in nature, were evident in the UV and optical from day 43. Subsequently, the SSS shows an oscillation with the same period but with a delay of 0.28P. The progenitor system has been identified; the secondary is most likely a sub-giant feeding a luminous accretion disk. Properties of the SSS infer a white dwarf (WD) mass $1.1 \mathrm{M}_\odot \lesssim M_{\rm WD} \lesssim 1.3 \mathrm{M}_\odot$. If the accretion occurs at constant rate, $\dot{\it{M}}_{\rm acc} \simeq 3.6^{+4.7}_{-2.5} \times 10^{-7} \mathrm{M}_\odot$ yr$^{-1}$ is needed, consistent with nova models for an inter-eruption interval of 38 years, low outburst amplitude, progenitor position in the color-magnitude diagram, and spectral energy distribution at quiescence. We note striking similarities between LMC 2009a and the Galactic nova KT Eri, suggesting that KT Eri is a candidate RN.
description: 20 pages, 23 figures, accepted for publication in the Astrophysical Journal
The Lick-Carnegie Exoplanet Survey: HD32963 -- A New Jupiter Analog Orbiting a Sun-like Star
Creators: name: Rowan, Dominick
name: Meschiari, Stefano
name: Laughlin, Gregory
name: Vogt, Steven S.
name: Butler, R. Paul
name: Burt, Jennifer
name: Wang, Songhu
name: Holden, Brad
name: Hanson, Russell
name: Arriagada, Pamela
name: Keiser, Sandy
name: Teske, Johanna
name: Diaz, Matias
Publisher: name: arXiv
Year: 2015
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We present a set of 109 new, high-precision Keck/HIRES radial velocity (RV) observations for the solar-type star HD 32963. Our dataset reveals a candidate planetary signal with a period of 6.49 $\pm$ 0.07 years and a corresponding minimum mass of 0.7 $\pm$ 0.03 Jupiter masses. Given Jupiter's crucial role in shaping the evolution of the early Solar System, we emphasize the importance of long-term radial velocity surveys. Finally, using our complete set of Keck radial velocities and correcting for the relative detectability of synthetic planetary candidates orbiting each of the 1,122 stars in our sample, we estimate the frequency of Jupiter analogs across our survey at approximately 3%.
description: 10 pages, 13 figures. Accepted for publication on the Astrophysical Journal. Full set of radial velocities included
An exponential-type upper bound for Folkman numbers
Creators: name: Rödl, Vojtěch
name: Ruciński, Andrzej
name: Schacht, Mathias
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05D10 (primary), 05C80 (secondary)

description: For given integers $k$ and $r$, the Folkman number $f(k;r)$ is the smallest number of vertices in a graph $G$ which contains no clique on $k+1$ vertices, yet for every partition of its edges into $r$ parts, some part contains a clique of order $k$. The existence (finiteness) of Folkman numbers was established by Folkman (1970) for $r=2$ and by Nešetřil and Rödl (1976) for arbitrary $r$, but these proofs led to very weak upper bounds on $f(k;r)$. Recently, Conlon and Gowers and independently the authors obtained a doubly exponential bound on $f(k;2)$. Here, we establish a further improvement by showing an upper bound on $f(k;r)$ which is exponential in a polynomial function of $k$ and $r$. This is comparable to the known lower bound $2^{Ω(rk)}$. Our proof relies on a recent result of Saxton and Thomason (2015) (or, alternatively, on a recent result of Balogh, Morris, and Samotij (2015)) from which we deduce a quantitative version of Ramsey's theorem in random graphs.
description: 17 pages, to appear in Combinatorica
Stochastic Galerkin Framework with Locally Reduced Bases for Nonlinear Two-Phase Transport in Heterogeneous Formations
Creators: name: Pettersson, Per
name: Tchelepi, Hamdi A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: The generalized polynomial chaos method is applied to the Buckley-Leverett equation. We consider a spatially homogeneous domain modeled as a random field. The problem is projected onto stochastic basis functions which yields an extended system of partial differential equations. Analysis and numerical methods leading to reduced computational cost are presented for the extended system of equations. The accurate representation of the evolution of a discontinuous stochastic solution over time requires a large number of stochastic basis functions. Adaptivity of the stochastic basis to reduce computational cost is challenging in the stochastic Galerkin setting since the change of basis affects the system matrix itself. To achieve adaptivity without adding overhead by rewriting the entire system of equations for every grid cell, we devise a basis reduction method that distinguishes between locally significant and insignificant modes without changing the actual system matrices. Results are presented for problems in one and two spatial dimensions, with varying number of stochastic dimensions. We show how to obtain stochastic velocity fields from realistic permeability fields and demonstrate the performance of the stochastic Galerkin method with local basis reduction. The system of conservation laws is discretized with a finite volume method and we demonstrate numerical convergence to the reference solution obtained through Monte Carlo sampling.
County-Level Spatiotemporal Patterns of New HIV Diagnoses and Pre-exposure Prophylaxis (PrEP) Use in Mississippi, 2014–2018: A Bayesian Analysis of Publicly Accessible Censored Data
Creators: name: Luan, Hui
name: Ransome, Yusuf
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: In the South region of the United States, HIV is disproportionately high and levels of pre-exposure prophylaxis (PrEP) use, which is highly effective in reducing the risk of acquiring HIV, are among the lowest across the country. Simultaneously examining the geographical distributions of both new HIV diagnoses and PrEP use as well as how they evolve over time at the county level is valuable for developing locally tailored intervention programs to target areas most in need of help. There is scant research on this topic using publicly accessible data sets, however, partly because of statistical challenges in modeling censored spatiotemporal data. This study fills this gap by applying a Bayesian spatiotemporal model to analyze interval-censored new HIV diagnoses and left-censored PrEP user data sets in Mississippi at the county level between 2014 and 2018. Suppressed values were modeled with Poisson distributions restricted to ranges where the possible values lie within. A simulation study indicates that the proposed model performs well in estimating censored values and regression coefficients as well as detecting hot spots. At the state level, new HIV diagnoses had a stable trend and PrEP use sharply increased during the study period. DeSoto and Hinds counties warrant special attention because their trends in new HIV diagnoses departed from the state-level trend. We demonstrate that publicly accessible, censored new HIV diagnosis and PrEP user data could be analyzed in ways that yield robust results, which can help health departments and other stakeholders more confidently identify areas that should be prioritized for aggressive HIV prevention.
Predicting crop growth
Creators: name: Research, Nature
Publisher: name: Manara - Qatar Research Repository
Year: 2023
Subjects: classificationCode: 30
subject: Agricultural, veterinary and food sciences
classificationCode: 3001
subject: Agricultural biotechnology
subject: FOS: Agricultural biotechnology
classificationCode: 37
subject: Earth sciences
classificationCode: 3702
subject: Climate change science

description: Researchers in Argentina have developed an agricultural-climatic model to determine which areas in the country have the most favourable conditions for growing a promising and sustainable energy crop. Camelina sativa, commonly known as gold of pleasure or false flax, is a flowering plant of the mustard family, which is native to the Mediterranean and central Asia. It is used to make biofuel for the aviation industry, which reduces emissions of greenhouse gases by more than 80% compared to petroleum kerosene. It is also rich in omega-3 oils so could be a suitable food source. In order to look for potential growing areas for the crop in Argentina, Silvia Falasca of the Water and Climate Institute in Buenos Aires and her colleagues analysed climate data from meteorological stations throughout the country between 1981 and 2010, focusing especially on variables such as average annual rainfall and temperature. Argentina occupies a vast area of South America and has a variety of climates, largely determined by the Andean mountain range, which forms a natural border to the west, and the Atlantic ocean, to the east. The model demonstrates that large areas are suitable for cultivating Camelina sativa, mostly in the northeast of the country (see map), while the southern parts of Argentina are less suitable or not suitable at all. Several areas, located in the eastern region of the Chaco and Formosa provinces, the western region of Corrientes, the northern and central regions of Entre Ríos, and the central and eastern regions of Buenos Aires, have optimal conditions — they receive at least 350 mm of rainfall, and have average temperatures greater than 10 °C between mid-August and mid-December, the time of year during which Camelina sativa growth occurs. The model also enabled the researchers to determine which of these areas are best suited for cultivating the crop for use as a food source, and where it would best be grown to harvest biofuel. To determine this, the researchers made sure that the production of biofuel in these areas would not be competing with the production of food crops. The team contend that the same modelling approach can be used in other regions of the world as well to determine areas where Camelina sativa, which could offer new income models in rural areas.
Other InformationPublished in: QScience.com Highlights, Published by Nature Research for Hamad bin Khalifa University Press (HBKU Press)
License: http://creativecommons.org/licenses/by/4.0
Planeación estratégica para el mejoramiento del Programa de Administración de Empresas de la Universidad de Cartagena
Creators: name: Badel Rodríguez, Nubia
name: Del Río Cortina, Abel
Publisher: name: Universidad de Cartagena
Year: 2001
Subjects: Administración estratégica
Planeación estratégica
Competitividad empresarial

description: Tesis (Administrador de Empresas). Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración de Empresas, 2001
description: El presente estudio tiene por objeto diseñar un modelo de gestión educativa integral basado en el desarrollo de habilidades y competencias en los educandos que permita el mejoramiento continuo al interior del programa de Administración de Empresas de la Universidad de Cartagena fortaleciendo la imagen corporativa y desarrollando ventajas competitivas.
A submillimeter search for pre- and proto-brown dwarfs in Chamaeleon II
Creators: name: de Gregorio-Monsalvo, I.
name: Barrado, D.
name: Bouy, H.
name: Bayo, A.
name: Palau, Aina
name: Morales-Calderon, M.
name: Huelamo, N.
name: Morata, O.
name: Merin, B.
name: Eiroa, C.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. Chamaeleon II molecular cloud is an active star forming region that offers an excellent opportunity for studying the formation of brown dwarfs in the southern hemisphere. Aims. Our aims are to identify a population of pre- and proto- brown dwarfs (5 sigma mass limit threshold of ~0.015 Msun) and provide information on the formation mechanisms of substellar objects. Methods. We performed high sensitivity observations at 870 microns using the LABOCA bolometer at the APEX telescope towards an active star forming region in Chamaeleon II. The data are complemented with an extensive multiwavelength catalogue of sources from the optical to the far-infrared to study the nature of the LABOCA detections. Results. We detect fifteen cores at 870 microns, and eleven of them show masses in the substellar regime. The most intense objects in the surveyed field correspond to the submillimeter counterparts of the well known young stellar objects DK Cha and IRAS 12500-7658. We identify a possible proto-brown dwarf candidate (ChaII-APEX-L) with IRAC emission at 3.6 and 4.5 microns. Conclusions. Our analysis indicates that most of the spatially resolved cores are transient, and that the point-like starless cores in the sub-stellar regime (with masses between 0.016 Msun and 0.066 Msun) could be pre-brown dwarfs cores gravitationally unstable if they have radii smaller than 220 AU to 907 AU (1.2" to 5" at 178 pc) respectively for different masses. ALMA observations will be the key to reveal the energetic state of these pre-brown dwarfs candidates.
description: 11 pages, 6 figures
Performance of the finite volume method in solving regularised Bingham flows: inertia effects in the lid-driven cavity flow
Creators: name: Syrakos, Alexandros
name: Georgiou, Georgios C.
name: Alexandrou, Andreas N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We extend our recent work on the creeping flow of a Bingham fluid in a lid-driven cavity, to the study of inertial effects, using a finite volume method and the Papanastasiou regularisation of the Bingham constitutive model [J. Rheology 31 (1987) 385-404]. The finite volume method used belongs to a very popular class of methods for solving Newtonian flow problems, which use the SIMPLE algorithm to solve the discretised set of equations, and have matured over the years. By regularising the Bingham constitutive equation it is easy to extend such a solver to Bingham flows since all that this requires is to modify the viscosity function. This is a tempting approach, since it requires minimum programming effort and makes available all the existing features of the mature finite volume solver. On the other hand, regularisation introduces a parameter which controls the error in addition to the grid spacing, and makes it difficult to locate the yield surfaces. Furthermore, the equations become stiffer and more difficult to solve, while the discontinuity at the yield surfaces causes large truncation errors. The present work attempts to investigate the strengths and weaknesses of such a method by applying it to the lid-driven cavity problem for a range of Bingham and Reynolds numbers (up to 100 and 5000 respectively). By employing techniques such as multigrid, local grid refinement, and an extrapolation procedure to reduce the effect of the regularisation parameter on the calculation of the yield surfaces (Liu et al. J. Non-Newtonian Fluid Mech. 102 (2002) 179-191), satisfactory results are obtained, although the weaknesses of the method become more noticeable as the Bingham number is increased.