cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Newmans Essay "Über die Befragung der Gläubigen in Dingen der christlichen Lehre"
Creators: name: Walgrave, Jan Hendrik
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 21 Nr. 4 (1985): Concilium: Internationale Zeitschrift für Theologie, Band 21, Heft 4
Compilación de los informes de alcaldes de los distritos del departamento de Bolívar 1887-1900
Creators: name: García Baeza, Gracy Helena
Publisher: name: Universidad de Cartagena
Year: 2008
Subjects: Cartagena,1887 - 1900 - Historia
Alcaldes,1987 - 1900 - Historia

description: Tesis (Historiador) - - Universidad de Cartagena. Facultad de Ciencias Humanas. Programa de Historia, 2008
description: Informe de los alcaldes de la provincia del departamento de Bolívar entre 1887-1900, que tienen un gran valor histórico, mostrando aspectos importantes de carácter político, económico y social en su momento de transición en cuanto a la organización territorial de las distintas provincias de los departamentos que hacen parte del territorio colombiano.
Nonparametric Conditional Density Estimation in a High-Dimensional Regression Setting
Creators: name: Izbicki, Rafael
name: Lee, Ann B.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: In some applications (e.g., in cosmology and economics), the regression E[Z|x] is not adequate to represent the association between a predictor x and a response Z because of multi-modality and asymmetry of f(z|x); using the full density instead of a single-point estimate can then lead to less bias in subsequent analysis. As of now, there are no effective ways of estimating f(z|x) when x represents high-dimensional, complex data. In this paper, we propose a new nonparametric estimator of f(z|x) that adapts to sparse (low-dimensional) structure in x. By directly expanding f(z|x) in the eigenfunctions of a kernel-based operator, we avoid tensor products in high dimensions as well as ratios of estimated densities. Our basis functions are orthogonal with respect to the underlying data distribution, allowing fast implementation and tuning of parameters. We derive rates of convergence and show that the method adapts to the intrinsic dimension of the data. We also demonstrate the effectiveness of the series method on images, spectra, and an application to photometric redshift estimation of galaxies.
Efficient coding of 360° videos exploiting inactive regions in projection formats
Creators: name: Herglotz, Christian
name: Jamali, Mohammadreza
name: Coulombe, Stéphane
name: Vazquez, Carlos
name: Vakili, Ahmad
Publisher: name: arXiv
Year: 2023
Subjects: subject: Image and Video Processing (eess.IV)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents an efficient method for encoding common projection formats in 360$^\circ$ video coding, in which we exploit inactive regions. These regions are ignored in the reconstruction of the equirectangular format or the viewport in virtual reality applications. As the content of these pixels is irrelevant, we neglect the corresponding pixel values in ratedistortion optimization, residual transformation, as well as inloop filtering and achieve bitrate savings of up to 10%.
description: 5 pages, 4 figures
Calamus geniculatus Griff., Calcutta J. Nat. Hist.
Creators: name: Baker, William J.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Arecales
Arecaceae
Calamus
Calamus geniculatus

description: Calamus geniculatus Griff., Calcutta J. Nat. Hist. 5: 67 (1845).
 Daemonorops geniculata (Griff.) Mart., Hist. Nat. Palm. 3: 329 (1853), Palmijuncus geniculatus (Griff.) Kuntze, Revis. Gen. Pl. 2: 733 (1891).
description: Published as part of Baker, William J., 2015, A revised delimitation of the rattan genus Calamus (Arecaceae), pp. 139-152 in Phytotaxa 197 (2) on page 143, DOI: 10.11646/phytotaxa.197.2.7, http://zenodo.org/record/13640784
NIHAO V: Too big doesn't fail -- reconciling the conflict between LCDM predictions and the circular velocities of nearby field galaxies
Creators: name: Dutton, Aaron A.
name: Macciò, Andrea V.
name: Frings, Jonas
name: Wang, Liang
name: Stinson, Gregory S.
name: Penzo, Camilla
name: Kang, Xi
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We compare the half-light circular velocities, V_{1/2}, of dwarf galaxies in the Local Group to the predicted circular velocity curves of galaxies in the NIHAO suite of LCDM simulations. We use a subset of 34 simulations in which the central galaxy has a stellar luminosity in the range 0.5 x 10^5 < L_V < 2 x 10^8 L_{sun}. The NIHAO galaxy simulations reproduce the relation between stellar mass and halo mass from abundance matching, as well as the observed half-light size vs luminosity relation. The corresponding dissipationless simulations over-predict the V_{1/2}, recovering the problem known as too big to fail (TBTF). By contrast, the NIHAO simulations have expanded dark matter haloes, and provide an excellent match to the distribution of V_{1/2} for galaxies with L_V > 2 x 10^6 L_{sun}. For lower luminosities our simulations predict very little halo response, and tend to over predict the observed circular velocities. In the context of LCDM, this could signal the increased stochasticity of star formation in haloes below M_{halo} \sim 10^{10} M_{sun}, or the role of environmental effects. Thus, haloes that are "too big to fail", do not fail LCDM, but haloes that are "too small to pass" (the galaxy formation threshold) provide a future test of LCDM.
description: 6 pages, 3 figures, accepted to MNRAS letters
Orbital optical lattices with bosons
Creators: name: Kock, T.
name: Hippler, C.
name: Ewerbeck, A.
name: Hemmerich, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: This article provides a synopsis of our recent experimental work exploring Bose-Einstein condensation in metastable higher Bloch bands of optical lattices. Bipartite lattice geometries have allowed us to implement appropriate band structures, which meet three basic requirements: the existence of metastable excited states sufficiently protected from collisional band relaxation, a mechanism to excite the atoms initially prepared in the lowest band with moderate entropy increase, and the possibility of cross-dimensional tunneling dynamics, necessary to establish coherence along all lattice axes. A variety of bands can be selectively populated and a subsequent thermalisation process leads to the formation of a condensate in the lowest energy state of the chosen band. As examples the 2nd, 4th and 7th bands in a bipartite square lattice are discussed. In the 2nd and 7th band, the band geometry can be tuned such that two inequivalent energetically degenerate energy minima arise at the $X_{\pm}$-points at the edge of the 1st Brillouin zone. In this case even a small interaction energy is sufficient to lock the phase between the two condensation points such that a complex-valued chiral superfluid order parameter can emerge, which breaks time reversal symmetry. In the 4th band a condensate can be formed in the $Γ$-point in the center of the 1st Brillouin zone, which can be used to explore topologically protected band touching points. The new techniques to access orbital degrees of freedom in higher bands greatly extend the class of many-body scenarios that can be explored with bosons in optical lattices.
description: 26 pages 24 figures
Rogue events in spatio-temporal numerical simulations of unidirectional waves in basins of different depth
Creators: name: Slunyaev, Alexey
name: Sergeeva, Anna
name: Didenkulova, Ira
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: The evolution of unidirectional nonlinear sea surface waves is calculated numerically by means of solutions of the Euler equations. The wave dynamics corresponds to quasi-equilibrium states characterized by JONSWAP spectra. The spatio-temporal data are collected and processed providing information about the wave height probability and typical appearance of abnormally high waves (rogue waves). The waves are considered at different water depths ranging from deep to relatively shallow cases ($k_p h > 0.8$, where $k_p$ is the peak wavenumber, and $h$ is the local depth). The asymmetry between front and rear rogue wave slopes is identified; it becomes apparent for sufficiently high waves in rough sea states at all considered depths. The lifetimes of rogue events may reach up to 30-60 wave periods depending on the water depth. The maximum observed wave has height of about 3 significant wave heights. A few randomly chosen in-situ time series from the Baltic Sea are in agreement with the general picture of the numerical simulations.
description: Submitted to Natural Hazards
An integral-factorized implementation of the driven similarity renormalization group second-order multireference perturbation theory
Creators: name: Hannon, Kevin P.
name: Li, Chenyang
name: Evangelista, Francesco A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We report an efficient implementation of a second-order multireference perturbation theory based on the driven similarity renormalization group (DSRG-MRPT2) [C. Li and F. A. Evangelista, J. Chem. Theory Comput. 11, 2097 (2015)]. Our implementation employs factorized two-electron integrals to avoid storage of large four-index intermediates. It also exploits the block structure of the reference density matrices to reduce the computational cost to that of second-order Møller$-$Plesset perturbation theory. Our new DSRG-MRPT2 implementation is benchmarked on ten naphthyne isomers using basis sets up to quintuple-$ζ$ quality. We find that the singlet-triplet splittings ($Δ_\text{ST}$) of the naphthyne isomers strongly depend on the equilibrium structures. For a consistent set of geometries, the $Δ_\text{ST}$ values predicted by the DSRG-MRPT2 are in good agreements with those computed by the reduced multireference coupled cluster theory with singles, doubles, and perturbative triples.
Análisis del sistema de capacitación y / o desarrollo profesional en los hoteles cinco estrellas en la ciudad de Cartagena De Indias D.T. y C.
Creators: name: Camacho Zaparan, Roberto C
name: Cardona Arbelaez, Diego Alfonso
Publisher: name: Universidad de Cartagena
Year: 1999
Subjects: Administración de personal
Recursos humanos
Capacitación de empleados

description: Tesis (Administrador de Empresas).--Universidad de Cartagena. facultad de Ciencias Económicas. Programa de Administración de Empresas, 1999
description: El presente estudio tiene por objeto analizar los programas de capacitación y / o desarrollo profesional que ofrecen los hoteles cinco estrellas en la ciudad de Cartagena de Indias, para determinar el impacto de los programas en la calidad de los servicios que prestan.
Random Access Design for Wireless Control Systems
Creators: name: Gatsis, Konstantinos
name: Ribeiro, Alejandro
name: Pappas, George J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: Interferences arising between wireless sensor-actuator systems communicating over shared wireless channels adversely affect closed loop control performance. To mitigate this problem we design appropriate channel access policies for wireless control systems subject to channel fading. The design is posed as an optimization problem where the total transmit power of the sensors is minimized while desired control performance is guaranteed for each involved control loop. Control performance is abstracted as a desired expected decrease rate of a given Lyapunov function for each loop. We prove that the optimal channel access policies are decoupled and, intuitively, each sensor balances the gains from transmitting to its actuator with the negative interference effect on all other control loops. Moreover the optimal policies are of a threshold nature, that is, a sensor transmits only under favorable local fading conditions. Finally, we show that the optimal policies can be computed by a distributed iterative procedure which does not require coordination between the sensors.
Probing dark matter crests with white dwarfs and IMBHs
Creators: name: Amaro-Seoane, Pau
name: Casanellas, Jordi
name: Schödel, Rainer
name: Davidson, Emily
name: Cuadra, Jorge
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: White dwarfs (WDs) are the most promising captors of dark matter (DM) particles in the crests that are expected to build up in the cores of dense stellar clusters. The DM particles could reach sufficient densities in WD cores to liberate energy through self-annihilation. The extinction associated with our Galactic Centre, the most promising region where to look for such effects, makes it impossible to detect the potential associated luminosity of the DM-burning WDs. However, in smaller stellar systems which are close enough to us and not heavily extincted, such as $ω-$Cen, we may be able to detect DM-burning WDs. We investigate the prospects of detection of DM-burning WDs in a stellar cluster harbouring an IMBH, which leads to higher densities of DM at the centre as compared with clusters without one. We calculate the capture rate of WIMPs by a WD around an IMBH and estimate the luminosity that a WD would emit depending on its distance to the center of the cluster. Direct-summation $N-$body simulations of $ω-$Cen yield a non-negligible number of WDs in the range of radii of interest. We apply our assumption to published HST/ACS observations of stars in the center of $ω-$Cen to search for DM burning WDs and, although we are not able to identify any evident candidate because of crowding and incompleteness, we proof that their bunching up at high luminosities would be unique. We predict that DM burning will lead to a truncation of the cooling sequence at the faint end. The detection of DM burning in future observations of dense stellar clusters, such as globular clusters or ultra-compact dwarf galaxies could allow us to probe different models of DM distributions and characteristics such as the DM particle scattering cross section on nucleons. On the other hand, if DM-burning WDs really exist, their number and properties could give hints to the existence of IMBHs.
description: Submitted. Comments welcome. Abstract has been abridged
Campodea (Campodea) coniphora Wygodzinsky 1941
Creators: name: Sendra, Alberto
name: Reboleira, Ana Sofia P. S.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplura
Campodeidae
Campodea
Campodea coniphora

description: Campodea (Campodea) coniphora Wygodzinsky, 1941
Campodea (Campodea) coniphora Wygodzinsky, 1941b: 64, fig. 1a–m.
Diagnosis (Wygodzinsky 1941b; Bareth 2006)
Body length 5.5 mm; epicuticle without microdenticles; short, slightly thick, smooth clothing setae; antennae with 26–27 antennomeres; long, thin barbed notal macrosetae; thin pine cone marginal setae; 1+1 la macrosetae on V urotergite; 1+1 la, 1+1 lp on VI–VII urotergites, 3+3 lp on VIII urotergite and 5+5 lp on IX abdominal segment; cerci covered in generally long, smooth macrosetae, sometimes with one thin distal barb, and sparse clothing setae.
Taxonomic notes
Specimens collected in Geneva (Supplementary file 2) have two noticeable differences from those originaly described: the thick notal and urotergal macrosetae having long barbs over all its length, and swollen latero-interior cercal macrosetae.
Habitat and distribution
Soil-dwelling species collected in a few localities in the Cévennes Mountains located in southern central France (Wygodzinsky 1941b; Condé 1948a), and a distinct population from Geneva (Switzerland).
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 31, DOI: 10.5852/ejt.2020.728.1181, http://zenodo.org/record/4316883
La Biennale de Dakar comme projet de coopération et de développement
Creators: name: Pensa, Iolanda
Publisher: name: Zenodo
Year: 2011
Subjects: Biennale de Dakar
Contemporary African art
Art system
International grants for culture

description: En partant de l'étude de Dak’Art, la biennale d’art contemporain africain du Sénégal, la recherche se propose d’explorer le système de l'art contemporain et, en particulier, la relation entre les arts visuels, les dynamiques spatiales, les politiques culturelles et le
 marché de l’art. Créée en 1990, la Biennale de Dakar est l'exposition d'art contemporain africain la plus importante du monde et celle qui peut vanter la plus ancienne tradition. Cette thèse entend montrer que la Biennale de Dakar est aussi et surtout un projet de coopération et de développement. Observer la manifestation de ce point de vue permet d'expliquer le système de l'art selon une démarche différente, en mesure de faire ressortir certaines caractéristiques parfois négligées. C’est précisément parce qu’il s'agit d'un projet de
 coopération et de développement que la biennale est d’un intérêt indiscutable, non seulement culturel, mais anthropologique, géographique et politique. Coopération, développement, territoire et représentation sont des notions qui forment la toile de fond de la recherche. Etant donné son importance non seulement artistique, la Biennale de Dakar permet d'observer de près le système de l'art contemporain ainsi que, plus en général, les visions imaginaires et les paysages liés à l'Afrique, l'ambiguïté des dualismes qui séparent le "nous" des "autres", la géopolitique internationale aussi bien que les lieux et les savoirs qui sont de plus en plus superposés et imbriqués. L'étude de la
 Biennale de Dakar contribue à évoquer la complexité des branchements et des représentations contemporaines.
description: Available also on Wikimedia Commons under CC BY-SA 3.0 https://commons.wikimedia.org/wiki/File:La_Biennale_de_Dakar_comme_projet_de_coop%C3%A9ration_et_de_d%C3%A9veloppement.pdf
Compact stable surfaces with constant mean curvature in Killing submersions
Creators: name: Lerma, Ana M.
name: Manzano, José M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: Primary 53C42, Secondary 53C15, 53C30

description: A Killing submersion is a Riemannian submersion from a 3-manifold to a surface, both connected and orientable, whose fibres are the integral curves of a Killing vector field, not necessarily unitary. The first part of this paper deals with the classification of all Killing submersions in terms of two geometric functions, namely the bundle curvature and the length of the Killing vector field, which can be prescribed arbitrarily. In a second part, we show that if the base is compact and the submersion admits a global section, then it also admits a global minimal section. These turn out to be the only global sections with constant mean curvature, which solves the Bernstein problem in Killing submersions over compact base surfaces, as well as the Plateau problem with empty boundary. Finally, we prove that any compact orientable stable surface with constant mean curvature immersed in the total space of a Killing submersion must be either an entire minimal section or everywhere tangent to the Killing direction.
description: 20 pages
Model Comparison for Water Quality Predictions: Manual vs IoT-Based Approaches
Creators: name: Omkar Singh, Rishidev Mishra, Prathamesh Vaidya
Publisher: name: Zenodo
Year: 2025

description: This project develops a water quality prediction system using machine learning and IoT devices toassess and classify water quality accurately, efficiently, and effectively. IoT sensors are deployed tocollect real-time data on various key water quality parameters, including pH, temperature, andconductivity, etc. Data is futher comprehensively analyzed. Missing values are preprocessed, and waterquality indices such as the National Sanitation Foundation Water Quality Index (NSFWQI) are applied.Various machine learning models, including linear regression, decision tree regressor, support vectorregressor, random forest regressor and gradient boosting regressor, are utilized to predict water quality.These models are evaluated using performance metrics such as Mean Absolute Error (MAE), MeanSquared Error (MSE), Root Mean Squared Error (RMSE), and R² score. The project highlights how AIand IoT can enhance water quality assessment for household, industrial, and environmental applicationsby enabling real-time monitoring and predictive analysis.
Degradación por fotocatálisis homogénea (foto-fenton) de efluentes líquidos contaminados con residuos de fenol
Creators: name: Cerro Bastidas, Onix José
name: Orozco Benitez, Angel
name: Aznate Teherán, Luís Alfredo
Publisher: name: Universidad de Cartagena
Year: 2013
Subjects: Catálisis
Fotocatalisis

description: Tesis (Ingeniero Químico).--Universidad de Cartagena. Facultad de Ciencias E Ingenierías. Programa de Ingeniería Química, 2013
description: La industria petroquímica es considerada una de las más contaminantes, debido al gran volumen de efluentes que son desechados de manera indiscriminada y sin un previo tratamiento. Teniendo en cuenta, que la mayoría de estos desechos son compuestos orgánicos, es necesario contemplar un tratamiento para su degradación por su carácter contaminante y poco biodegradable. En este proyecto se estudió la fotocatálisis solar homogénea (Foto-Fenton), como un método para degradar una solución de fenol de 200 ppm, utilizando un reactor solar de placa plana, donde se evaluaron los efectos del reactivo Fenton (peróxido de hidrógeno y sulfato ferroso) bajo las variables de radiación acumulada 8000 𝐽𝑚2 , pH 2,8 – 3,2 y temperatura ambiente, obteniéndose el óptimo con una degradación global de 74,2 %. A partir de este resultado, se analizó el carbono orgánico total presente y la relación DBO/DQO para determinar la biodegradabilidad potencial del efluente despuésdel tratamiento fotocatalítico solar. Este valor aumentó de 0,48 a 0,54. El ensayo de Zahn-Wellens confirmó la biodegrabilidad del efluente tratado con Foto-Fenton (89% en 28 días). Se comprobó que el proceso foto-Fento es una alternativa eficaz para el tratamiento de fenol y que puede ser usado como pretratramiento en un potencial acople fotoquímico-biológico.
First hard X-ray observations of the blazar S5 0716+714 with NuSTAR during a multiwavelength campaign
Creators: name: Wierzcholska, Alicja
name: Siejkowski, Hubert
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report the results of a multifrequency campaign targeting S5 0716+714 in the flaring state of the source observed in 2015 January and February. The observations have been performed using the following instruments: Fermi/Large Area Telescope (LAT), Nuclear Spectroscopic Telescope Array, X-ray Telescope and Ultraciolet/Optical Telescope. The elevated flux level was visible in all frequencies and the outburst consists of five sub-flares. In this paper we focus on the analysis of the X-ray observations both in the soft and hard regimes for data collected with NuStar and Swift/XRT. This is the first time, when hard X-ray observations of the source collected with NuStar are reported. The studies reveal both low- and high-energy components clearly visible in the energy band, with the break energy of 8 keV, which is the highest break energy ever reported for S5 0716+714. The second part of this work is concentrated on multifrequency observations collected during the flaring activity period. The variability patterns recorded during the period are characterized using a fractional variability amplitude and description of the flare profiles. The correlation studies reveal strong and significant relation between the optical, ultraviolet and gamma-ray observations, and no time lag is found for any of the studied relations.
Calamus gracilipes Miq., Verh. Kon. Akad. Wetensch., Afd. Natuurk.
Creators: name: Baker, William J.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Arecales
Arecaceae
Calamus
Calamus gracilipes

description: Calamus gracilipes Miq., Verh. Kon. Akad. Wetensch., Afd. Natuurk. 11(5): 28 (1868).
 Palmijuncus gracilipes (Miq.) Kuntze, Revis. Gen. Pl. 2: 733 (1891). Daemonorops gracilipes (Miq.) Becc., Rec. Bot. Surv. India 2: 225 (1902).
 Daemonorops accedens var. brevispatha Blume, Rumphia 3: 13 (1838).
 Daemonorops longipes Miq., Fl. Ned. Ind., Eerste Bijv.: 592 (1861), nom. illeg.
description: Published as part of Baker, William J., 2015, A revised delimitation of the rattan genus Calamus (Arecaceae), pp. 139-152 in Phytotaxa 197 (2) on page 143, DOI: 10.11646/phytotaxa.197.2.7, http://zenodo.org/record/13640784
Ordnungskonflikte auf der Bühne des Spätmittelalters und der Frühen Neuzeit
Creators: name: Lüpke, Beatrice Von
name: Nöcker, Rebekka
name: Ridder, Klaus
Publisher: name: Universität Tübingen
Year: 2015
Subjects: subject: Literaturwissenschaft
subject: 830

description: Zweitveröffentlichung
X-ray/UV variability and the origin of soft X-ray excess emission from II Zw 177
Creators: name: Pal, Main
name: Dewangan, Gulab C.
name: Misra, Ranjeev
name: Pawar, Pramod K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study X-ray and UV emission from the narrow-line Seyfert 1 galaxy II~Zw~177 using a $137\ks$ long and another $13\ks$ short \xmm{} observation performed in 2012 and 2001, respectively. Both observations show soft X-ray excess emission contributing $76.9\pm4.9\%$ in 2012 and $58.8\pm10.2\%$ in 2001 in the $0.3-2\kev$ band. We find that both blurred reflection from an ionized disc and Comptonized disc emission describe the observed soft excess well. Time-resolved spectroscopy on scales of $\sim20\ks$ reveals strong correlation between the soft excess and the powerlaw components. The fractional variability amplitude $F_{var}$ derived from EPIC-pn lightcurves at different energy bands is nearly constant ($F_{var} \sim20\%$). This is in contrast to other AGNs where the lack of short term variation in soft X-ray excess emission has been attributed to intense light bending in the framework of the "lamppost" model. Thus, the variations in powerlaw emission are most likely intrinsic to corona rather than just due to the changes of height of compact corona. The variable UV emission ($F_{var} \sim 1\%$) is uncorrelated to any of the X-ray components on short timescales suggesting that the UV emission is not dominated by the reprocessed emission. The gradual observed decline in the UV emission in 2012 may be related to the secular decline due to the changes in the accretion rate. In this case, the short term X-ray variability is not due to the changes in the seed photons but intrinsic to the hot corona.
description: 25 pages, 10 figures, accepted in MNRAS journal
Análisis del impacto del microcrédito otorgado por Bancamía en el sector microempresarial del mercado de Bazurto de la ciudad de Cartagena durante el periodo 2009-2011
Creators: name: Eljach Salcedo, Fari Manuel
name: Giraldo Hincapié, Johnny Alberto
Publisher: name: Universidad de Cartagena
Year: 2013
Subjects: Microfinanzas
Microcrédito
Servicios financieros

description: Tesis(Administrador de Empresas).-Universidad de Cartagena,Facultad de Ciencias Económicas. Programa de Administración de Empresas,2013
description: La promoción del Microcrédito como herramienta eficaz en la lucha contra la pobreza a nivel mundial, se fundamenta en los múltiples beneficios socioeconómicos que -en un país subdesarrollado como Colombia- representa brindarle apoyo financiero a los microempresarios y pequeños emprendedores. Sin embargo es necesario ir más allá de los planteamientos que asumen la inherencia de impactos benéficos al suministro de este tipo de créditos, intentando determinar específicamente como impactan los microcréditos la actividad productiva de los emprendedores y como por extensión esto puede llegar a beneficiar a nivel social al microempresario y su familia. En tal sentido a través del presente trabajo elaborado bajo el modelo de estudio de corte o transversal, se pretendió determinar cuál fue el impacto generado por el microcrédito suministrado por Bancamía entre los años 2009 y 2011 al sector microempresarial del Mercado de Bazurto, para tal propósito durante trabajo de campo se aplicaron encuestas con preguntas de tipo retrospectivo, las cuales permitieron determinar que estos préstamos influyeron en la experimentación de aumentos en las ventas, los cuales a su vez representaron mayor disponibilidad de recursos para los hogares, situación que llevo a los microempresarios a calificar los créditos como herramientas útiles, algo que se ratifica con sus altos niveles de satisfacción con el servicio en general. De esta forma se concluyó que el microcrédito constituye una fuente de financiación que ayuda al fortalecimiento del autoempleo desarrollado por los microempresarios, sin embargo este debería ser implementado como parte de una política integral, que a la par de promover su masificación y uso, proveyera formación técnica y académica a los microempresarios, con miras a elevar los niveles de productividad, como paso previo para aspirar al desarrollo empresarial
Calamus ingens W. J. Baker 2015, comb. nov.
Creators: name: Baker, William J.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Arecales
Arecaceae
Calamus
Calamus ingens

description: Calamus ingens (J.Dransf.) W.J.Baker, comb. nov.
 Daemonorops ingens J.Dransf., Bot. J. Linn. Soc. 81: 20 (1980).
description: Published as part of Baker, William J., 2015, A revised delimitation of the rattan genus Calamus (Arecaceae), pp. 139-152 in Phytotaxa 197 (2) on page 144, DOI: 10.11646/phytotaxa.197.2.7, http://zenodo.org/record/13640784
Remarks on scale separation in flux vacua
Creators: name: Gautason, F. F.
name: Schillo, M.
name: Van Riet, T.
name: Williams, M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We argue that the Maldacena-Nunez no-go theorem excluding Minkowski and de Sitter vacua in flux compactifications can be extended to exclude anti-de Sitter (AdS) vacua for which the Kaluza-Klein scale is parametrically smaller than the AdS length scale. As a practical application of this observation we demonstrate that the mechanism to resolve O6 singularities in massive type IIA at the classical level is likely not to occur in AdS compactifications with scale separation. We furthermore remark that a compactification to four observable dimensions implies a large cosmological hierarchy.
description: 12 pages, 1 figure
Quasar clustering in a galaxy and quasar formation model based on ultra high-resolution N-body simulations
Creators: name: Oogi, Taira
name: Enoki, Motohiro
name: Ishiyama, Tomoaki
name: Kobayashi, Masakazu A. R.
name: Makiya, Ryu
name: Nagashima, Masahiro
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate clustering properties of quasars using a new version of our semi-analytic model of galaxy and quasar formation with state-of-the-art cosmological N-body simulations. In this study, we assume that a major merger of galaxies triggers cold gas accretion on to a supermassive black hole and quasar activity. Our model can reproduce the downsizing trend of the evolution of quasars. We find that the median mass of quasar host dark matter haloes increases with cosmic time by an order of magnitude from z=4 (a few 1e+11 Msun) to z=1 (a few 1e+12 Msun), and depends only weakly on the quasar luminosity. Deriving the quasar bias through the quasar--galaxy cross-correlation function in the model, we find that the quasar bias does not depend on the quasar luminosity, similar to observed trends. This result reflects the fact that quasars with a fixed luminosity have various Eddington ratios and thus have various host halo masses that primarily determine the quasar bias. We also show that the quasar bias increases with redshift, which is in qualitative agreement with observations. Our bias value is lower than the observed values at high redshifts, implying that we need some mechanisms that make quasars inactive in low-mass haloes and/or that make them more active in high-mass haloes.
description: 6 pages, 3 figures, to appear in MNRAS Letters
A grid of Non-LTE line-blanketed atmosphere structures and synthetic spectra for subdwarfs
Creators: name: Pacheco, Thayse A.
name: Levenhagen, Ronaldo S.
name: Diaz, Marcos P.
name: Coelho, Paula R. T.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present an update of the grid of detailed atmosphere models and homogeneous synthetic spectra for hot, high-gravity subdwarf stars. High-resolution spectra and synthetic photometry were calculated in the wavelength range 1,000 Å - 10,000 Å using Non-LTE extensively line-blanketed atmosphere structures.
description: Proceedings of the 10th meeting on hot subdwarfs and related objects. http://svo2.cab.inta-csic.es/theory/newov2/index.php?models=pacheco https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJS/256/41 http://specmodels.iag.usp.br/public_files/pacheco21/
Diseño del plan maestro para repuestas a emergencias tecnológicas de la empresa fertilizantes compuestos S. A.
Creators: name: Ramírez Caballero, Adelaida
name: Ruiz Vargas, Jaime
Publisher: name: Universidad de Cartagena
Year: 2003
Subjects: Contaminates químicos
Riesgos Químicos

description: Tesis (Especialista en Salud Ocupacional) -- Universidad de Cartagena. Facultad de enfermería. Departamento de postgrado y educación continua, 2003
description: Debido a la naturaleza de sus procesos de produccion de fertilizantes compuestos S.A., a las operaciones de recibo y almacenamiento de fertilizantes y materias primas, pueden presentarse situaciones potenciales de peligro, tales como explosiones , incendios, derrames de productos y escapes de gases, que pueden producir efectos negativos al ambiente, lesiones a las personas y daño a equipos y estructuras.
Valoración de la calidad por los clientes de la empresa Seguridad, Protección y Soldadura S.A.S. y su relación con la satisfacción e intención de recompra, mediante el modelo servperf
Creators: name: Borrero Requena, Lina Marcela
name: Hernández Arnedo, Paula Alejandra
Publisher: name: Universidad de Cartagena
Year: 2015
Subjects: Atención al cliente
Satisfacción del consumidor
Calidad del servicio

description: Tesis (Administrador Industrial).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración Industrial, 2015
description: El presente trabajo tiene como objetivo, valorar la calidad del servicio percibida por los clientes de la empresa Seguridad, Protección y Soldadura S.A.S. y su relación con la satisfacción e intención de recompra, mediante el modelo SERVPERF.
Isogeometric analysis for functionally graded microplates based on modified couple stress theory
Creators: name: Nguyen, Hoang X.
name: Nguyen, Tuan N.
name: Abdel-Wahab, M.
name: Bordas, S. P. A.
name: Nguyen-Xuan, H.
name: Vo, Thuc P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: Analysis of static bending, free vibration and buckling behaviours of functionally graded microplates is investigated in this study. The main idea is to use the isogeometric analysis in associated with novel four-variable refined plate theory and quasi-3D theory. More importantly, the modified couple stress theory with only one material length scale parameter is employed to effectively capture the size-dependent effects within the microplates. Meanwhile, the quasi-3D theory which is constructed from a novel seventh-order shear deformation refined plate theory with four unknowns is able to consider both shear deformations and thickness stretching effect without requiring shear correction factors. The NURBS-based isogeometric analysis is integrated to exactly describe the geometry and approximately calculate the unknown fields with higher-order derivative and continuity requirements. The convergence and verification show the validity and efficiency of this proposed computational approach in comparison with those existing in the literature. It is further applied to study the static bending, free vibration and buckling responses of rectangular and circular functionally graded microplates with various types of boundary conditions. A number of investigations are also conducted to illustrate the effects of the material length scale, material index, and length-to-thickness ratios on the responses of the microplates.
description: 57 pages, 14 figures, 18 tables
Leo P: How Many Metals can a Very Low-Mass, Isolated Galaxy Retain?
Creators: name: McQuinn, Kristen B. W.
name: Skillman, Evan D.
name: Dolphin, Andrew
name: Cannon, John M.
name: Salzer, John J.
name: Rhode, Katherine L.
name: Adams, Elizabeth A. K.
name: Berg, Danielle
name: Giovanelli, Riccardo
name: Haynes, Martha P.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Leo P is a gas-rich dwarf galaxy with an extremely low gas-phase oxygen abundance (3% solar). The isolated nature of Leo P enables a quantitative measurement of metals lost solely due to star formation feedback. We present an inventory of the oxygen atoms in Leo P based on the gas-phase oxygen abundance measurement, the star formation history, and the chemical enrichment evolution derived from resolved stellar populations. The star formation history also provides the total amount of oxygen produced. Overall, Leo P has retained 5 % of its oxygen; 25% of the retained oxygen is in the stars while 75% is in the gas phase. This is considerably lower than the 20-25% calculated for massive galaxies, supporting the trend for less efficient metal retention for lower mass galaxies. The retention fraction is higher than that calculated for other alpha elements (Mg, Si, Ca) in dSph Milky Way satellites of similar stellar mass and metallicity. Accounting only for the oxygen retained in stars, our results are consistent with those derived for the alpha elements in dSph galaxies. Thus, under the assumption that the dSph galaxies lost the bulk of their gas mass through an environmental process such as tidal stripping, the estimates of retained metal fractions represent underestimates by roughly a factor of four. Because of its isolation, Leo P provides an important datum for the fraction of metals lost as a function of galaxy mass due to star formation.
description: 6 pages, 2 figures, 2 tables
A workshop for high school students on naive set theory
Creators: name: Wegner, Sven-Ake
Publisher: name: arXiv
Year: 2016
Subjects: subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: Primary 97D80, Secondary 97C90, 97D40

description: In this article we present the prototype of a workshop on naive set theory designed for high school students in or around the seventh year of primary education. Our concept is based on two events which the author organized in 2006 and 2010 for students of elementary school and high school, respectively. The article also includes a practice report on the two workshops.
description: 8 pages
A particle filter to reconstruct a free-surface flow from a depth camera
Creators: name: Combès, Benoit
name: Heitz, Dominique
name: Guibert, Anthony
name: Mémin, Etienne
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We investigate the combined use of a Kinect depth sensor and of a stochastic data assimilation method to recover free-surface flows. More specifically, we use a Weighted ensemble Kalman filter method to reconstruct the complete state of free-surface flows from a sequence of depth images only. This particle filter accounts for model and observations errors. This data assimilation scheme is enhanced with the use of two observations instead of one classically. We evaluate the developed approach on two numerical test cases: a collapse of a water column as a toy-example and a flow in an suddenly expanding flume as a more realistic flow. The robustness of the method to depth data errors and also to initial and inflow conditions is considered. We illustrate the interest of using two observations instead of one observation into the correction step, especially for unknown inflow boundary conditions. Then, the performance of the Kinect sensor to capture temporal sequences of depth observations is investigated. Finally, the efficiency of the algorithm is qualified for a wave in a real rectangular flat bottom tank. It is shown that for basic initial conditions, the particle filter rapidly and remarkably reconstructs velocity and height of the free surface flow based on noisy measurements of the elevation alone.
Down-the-barrel and transverse observations of the Large Magellanic Cloud: evidence for a symmetrical galactic wind on the near and far sides of the galaxy
Creators: name: Barger, Kat
name: Lehner, Nicolas
name: Howk, J. Chris
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We compare the properties of gas flows on both the near and far side of the Large Magellanic Cloud (LMC) disk using Hubble Space Telescope UV absorption-line observations toward an AGN behind (transverse) and a star within (down-the-barrel) the LMC disk at an impact parameter of 3.2 kpc. We find that even in this relatively quiescent region gas flows away from the disk at speeds up to $\sim$100 km/s in broad and symmetrical absorption in the low and high ions. The symmetric absorption profiles combined with previous surveys showing little evidence that the ejected gas returns to the LMC and provide compelling evidence that the LMC drives a global, large-scale outflow across its disk, which is the likely result of a recent burst of star formation in the LMC. We find that the outflowing gas is multiphase, ionized by both photoionization (SiII and SiIII) and collisional ionization (SiIV and CIV). We estimate a total mass and outflow rate to be $>10^7$ Msun and $>0.4$ Msun/yr. Since the velocity of this large-scale outflow does not reach the LMC escape velocity, the gas removal is likely aided by either ram-pressure stripping with the Milky Way halo or tidal interactions with the surrounding galaxies, implying that the environment of LMC-like or dwarf galaxies plays an important role in their ultimate gas starvation. Finally we reassess the mass and plausible origins of the high-velocity complex toward the LMC given its newly-determined distance that places it in the lower Milky Way halo and sky-coverage that shows it extends well beyond the LMC disk.
description: Accepted to ApJ
On the benefits of sleep
Creators: name: Research, Nature
Publisher: name: Manara - Qatar Research Repository
Year: 2023
Subjects: classificationCode: 32
subject: Biomedical and clinical sciences
classificationCode: 3201
subject: Cardiovascular medicine and haematology

description: The American author Edgar Allen Poe famously loathed it, referring to it as “little slices of death”, but we now know that sleep plays an important role in physical and mental health. It is well known that sleep deprivation can significantly affect cognitive functions such as attention and memory. More recently, sleep disturbances have been linked to a wide variety of conditions, from psychiatric disorders such as depression to neurodegenerative diseases such as Alzheimer’s and Parkinson’s. Disruptions in the circadian rhythm, or the “biological clock” of the body, are also associated with increased risk of cancer, heart disease, and metabolic disorders. The incidence of these conditions is increasing around the world, and a growing body of evidence links this to urbanisation, unbalanced diets and the emergence of the so-called “24-hour society”, in which many do shift work. A recent review by Dietrich Büsselberg of the Weill-Cornell Medical School in Qatar and his team summarises this evidence, in order to help understand exactly how they are linked, and develop ways and policies to reverse the trend. People who work nights are exposed to artificial light, and this significantly affects the expression of “clock genes” that synchronize body functions to the day–night cycle. Research shows that clock genes play important roles in controlling cell division and suppressing tumour growth, as well as in regulating cardiovascular and metabolic function. While researchers are still unsure how disrupted circadian rhythms might contribute to the development of these diseases, it seems clear that long-term shift work poses major health risks. Büsselberg and his colleagues make a number of recommendations for reducing these risks. They suggest, for example, that employers consider reducing the number of shift rotations, and increasing the time between shift changes. They also suggest that night shift workers do everything they can to ensure they get good quality sleep— such as avoiding coffee and physical exertion before sleep, wearing eye masks and ear plugs—and that they have regular health checks. “More long-term studies on humans—including groups experiencing regular night shifts—are needed to firmly link different diseases to conditions which disturb the circadian rhythm,” says Büsselberg. “We are planning to have a closer look at how melatonin, the hormone which is released during the night, modulates intracellular calcium concentration, and how this could possibly relate to the induction of cancer.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
De la prueba por confesión en nuestra legislación colombiana
Creators: name: Calvo Ramos, Aura Mabel
Publisher: name: Universidad de Cartagena
Year: 1987
Subjects: Prueba (Derecho) - Colombia
Legislación - Colombia

description: Tesis (Abogado) -- Universidad de Cartagena. Facultad de Derecho y Ciencias Políticas. Programa de Derecho, 1987
description: Conocimiento amplio de las pruebas por confesión concepto, importancia, sistemas fundamentales en la actividad probatoria para su valoración, sentando las bases para comprensión del tema.