cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Development of beta-carotene-loaded poly(lactic acid)/hydroxyapatite core-shell nanoparticles for osteoblast differentiation
Creators: name: Lee, Sungho
name: Sugimoto, Yoshihiko
name: Kato, Katsuya
name: Miyajima, Tatsuya
name: Sakurai, Makoto
name: Nagata, Fukue
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: 20199 Astronomical and Space Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Developmental Biology
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Beta-carotene (BC) is a nutrient in vegetables and a precursor of vitamin A. BC has been reported to have anticarcinogenic, antiaging, and antioxidation properties and prevents heart diseases. Recently, BC has gained significant attention due to stimulating effect on osteoblast differentiation. Poly(lactic acid)/hydroxyapatite (PLA/HAp) core-shell nanoparticles have been reported earlier with a load capacity of 250% for water-insoluble substances, using a surfactant-free emulsification method. In this work, PLA/HAp core-shell nanoparticles loaded with BC were prepared, and osteoblast differentiation behavior was evaluated. BC was successfully loaded into PLA/HAp core-shell nanoparticles with diameters of approximately 30 nm. BC/loaded PLA/HAp core-shell nanoparticles stimulated osteoblast differentiation by upregulating collagen type I, osteopontin, and osteocalcin expression. In addition, the gene expression levels of these osteoblasts were significantly larger than those stimulated by PLA/HAp core-shell nanoparticles without BC and cultured in a differential medium (with ascorbic acid and β-glycerophosphate). PLA/HAp core-shell nanoparticles showed satisfactory cytocompatibility because they were attached to the osteoblasts. Consequently, BC was effectively delivered to osteoblasts by nanoparticles. These results suggested that BC-loaded PLA/HAp core-shell nanoparticles could enhance bone formation.
Critical phenomena on k-booklets
Creators: name: Grassberger, Peter
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We define a `k-booklet' to be a set of k semi-infinite planes with $-\infty < x < \infty$ and $y \geq 0$, glued together at the edges (the `spine') y=0. On such booklets we study three critical phenomena: Self-avoiding random walks, the Ising model, and percolation. For k=2 a booklet is equivalent to a single infinite lattice, for k=1 to a semi-infinite lattice. In both these cases the systems show standard critical phenomena. This is not so for k>2. Self avoiding walks starting at y=0 show a first order transition at a shifted critical point, with no power-behaved scaling laws. The Ising model and percolation show hybrid transitions, i.e. the scaling laws of the standard models coexist with discontinuities of the order parameter at $y\approx 0$, and the critical points are not shifted. In case of the Ising model ergodicity is already broken at $T=T_c$, and not only for $T
description: 5 pages, 8 figures
Internet para el empresario de las Pymes industriales en Cartagena de Indias
Creators: name: Cabarcas Padilla, Liliana Margarita
name: Mier Pernett, Antonio José
Publisher: name: Universidad de Cartagena
Year: 1997
Subjects: Innovaciones tecnológicas
Pequeña Industria

description: Tesis (Administrador de Empresas). Universidad de Cartagena, Facultad de Ciencias Económicas. Programa de Administración de Empresas, 1997
description: El presente estudio tiene por objeto determinar la forma de implementación del uso de Internet como herramienta en el proceso de toma de decisiones del empresario de las pymes industriales en Cartagena de Indias.
The employment dynamics of different population groups over the business cycle
Creators: name: Bredemeier, Christian
name: Winkler, Roland
Publisher: name: Technische Universität Dortmund
Year: 2014
Subjects: subject: employment
subject: demography
subject: heterogeneous labor-market outcomes
subject: business cycles
subject: 310
subject: 330
subject: 620

description: We use Bayesian VARs to analyze differences in employment dynamics across population groups in the US. The employment of males, young people, non-whites, the less educated, and workers in blue-collar occupations fluctuates more heavily. We further document across-group differences in the timing of employment reactions to business-cycle shocks. Groups with stronger fluctuations are affected early in the transmission process. Furthermore, we disentangle between the effects of different shocks. Supply shocks primarily drive differences between occupations, genders, age groups, and education groups. Demand shocks are important for the dynamics of employment ratios between races and ethnic origins.
description: Discussion Paper / SFB 823;21/2014
Assessment Of Monitoring And Evaluation Practice (The case study of Save the Children International) Addis Ababa, Ethiopia
Creators: name: Aklilu, Helen
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: Monitoring and Evaluation practices are very essential to deliver the project/program based on the interest of all stakeholders. It is also important for effective and efficient implementation of the program. Even if monitoring and evaluation is important, it is not known how and to what extent are practicing monitoring and evaluation in the context of Save the children international of meal program. This research, thus, is in the very rationale of assessing the practice and challenges associated with M&E practices of meal program in save the children with a purpose of filling this gap. Following a review of the literatures related to the problem understudy, a survey questioner was developed and distributed to 13 professionals working in meal department finally, 12 respondents filled in and returned the questioner properly This research employed judgmental sampling technique for acquisition of quantitative data all the six challenges were found related to M&E practice by the implementation of the meal program.
Understanding Human-Machine Networks: A Cross-Disciplinary Survey
Creators: name: Tsvetkova, Milena
name: Yasseri, Taha
name: Meyer, Eric T.
name: Pickering, J. Brian
name: Engen, Vegard
name: Walland, Paul
name: Lüders, Marika
name: Følstad, Asbjørn
name: Bravos, George
Publisher: name: arXiv
Year: 2015
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computers and Society (cs.CY)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences
subject: A.1; C.2.4; H.1.2; J.4; K.6.0

description: In the current hyper-connected era, modern Information and Communication Technology systems form sophisticated networks where not only do people interact with other people, but also machines take an increasingly visible and participatory role. Such human-machine networks (HMNs) are embedded in the daily lives of people, both for personal and professional use. They can have a significant impact by producing synergy and innovations. The challenge in designing successful HMNs is that they cannot be developed and implemented in the same manner as networks of machines nodes alone, nor following a wholly human-centric view of the network. The problem requires an interdisciplinary approach. Here, we review current research of relevance to HMNs across many disciplines. Extending the previous theoretical concepts of socio-technical systems, actor-network theory, cyber-physical-social systems, and social machines, we concentrate on the interactions among humans and between humans and machines. We identify eight types of HMNs: public-resource computing, crowdsourcing, web search engines, crowdsensing, online markets, social media, multiplayer online games and virtual worlds, and mass collaboration. We systematically select literature on each of these types and review it with a focus on implications for designing HMNs. Moreover, we discuss risks associated with HMNs and identify emerging design and development trends.
description: Forthcoming in ACM Computing Surveys
Approximate symmetries of Hamiltonians
Creators: name: Chubb, Christopher T.
name: Flammia, Steven T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: Operator Algebras (math.OA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We explore the relationship between approximate symmetries of a gapped Hamiltonian and the structure of its ground space. We start by showing that approximate symmetry operators---unitary operators whose commutators with the Hamiltonian have norms that are sufficiently small---which possess certain mutual commutation relations can be restricted to the ground space with low distortion. We generalize the Stone-von Neumann theorem to matrices that approximately satisfy the canonical (Heisenberg-Weyl-type) commutation relations, and use this to show that approximate symmetry operators can certify the degeneracy of the ground space even though they only approximately form a group. Importantly, the notions of "approximate" and "small" are all independent of the dimension of the ambient Hilbert space, and depend only on the degeneracy in the ground space. Our analysis additionally holds for any gapped band of sufficiently small width in the excited spectrum of the Hamiltonian, and we discuss applications of these ideas to topological quantum phases of matter and topological quantum error correcting codes. Finally, in our analysis we also provide an exponential improvement upon bounds concerning the existence of shared approximate eigenvectors of approximately commuting operators which may be of independent interest.
description: 24 pages, 6 figures, comments welcome
Human-Machine Networks: Towards a Typology and Profiling Framework
Creators: name: Eide, Aslak Wegner
name: Pickering, J. Brian
name: Yasseri, Taha
name: Bravos, George
name: Følstad, Asbjørn
name: Engen, Vegard
name: Tsvetkova, Milena
name: Meyer, Eric T.
name: Walland, Paul
name: Lüders, Marika
Publisher: name: arXiv
Year: 2016
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Computers and Society (cs.CY)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: In this paper we outline an initial typology and framework for the purpose of profiling human-machine networks, that is, collective structures where humans and machines interact to produce synergistic effects. Profiling a human-machine network along the dimensions of the typology is intended to facilitate access to relevant design knowledge and experience. In this way the profiling of an envisioned or existing human-machine network will both facilitate relevant design discussions and, more importantly, serve to identify the network type. We present experiences and results from two case trials: a crisis management system and a peer-to-peer reselling network. Based on the lessons learnt from the case trials we suggest potential benefits and challenges, and point out needed future work.
description: Pre-print; To be presented at the 18th International Conference on Human-Computer Interaction International, Toronto, Canada, 17 - 22 July 2016
$\mathcal{H}_2$-Optimal Model Reduction Using Projected Nonlinear Least Squares
Creators: name: Hokanson, Jeffrey M.
name: Magruder, Caleb C.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 41A20, 46E22, 90C53, 93A15, 93C05, 93C15

description: In many applications throughout science and engineering, model reduction plays an important role replacing expensive large-scale linear dynamical systems by inexpensive reduced order models that capture key features of the original, full order model. One approach to model reduction finds reduced order models that are locally optimal approximations in the $\mathcal{H}_2$ norm, an approach taken by the Iterative Rational Krylov Algorithm (IRKA) among others. Here we introduce a new approach for $\mathcal{H}_2$-optimal model reduction using the projected nonlinear least squares framework previously introduced in [J. M. Hokanson, SIAM J. Sci. Comput. 39 (2017), pp. A3107--A3128]. At each iteration, we project the $\mathcal{H}_2$ optimization problem onto a finite-dimensional subspace yielding a weighted least squares rational approximation problem. Subsequent iterations append this subspace such that the least squares rational approximant asymptotically satisfies the first order necessary conditions of the original, $\mathcal{H}_2$ optimization problem. This enables us to build reduced order models with similar error in the $\mathcal{H}_2$ norm but using far fewer evaluations of the expensive, full order model compared to competing methods. Moreover, our new algorithm only requires access to the transfer function of the full order model, unlike IRKA which requires a state-space representation or TF-IRKA which requires both the transfer function and its derivative. Applying the projected nonlinear least squares framework to the $\mathcal{H}_2$-optimal model reduction problem open new avenues for related model reduction problems.
The Thermal Proximity Effect: A New Probe of He II Reionization History and the Quasar Lifetime
Creators: name: Khrykin, Ilya S.
name: Hennawi, Joseph F.
name: McQuinn, Matthew
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Despite decades of effort, the timing and duration of He II reionization, as well as its morphology and the properties of the quasars believed to drive it, are still not well constrained. In this paper we present a new method to study both He II reionization and quasars via the thermal proximity effect -- the photoelectric heating of the intergalactic medium around quasars when their hard radiation doubly ionizes helium. We post-process a SPH simulation with 1D radiative calculations, and study how the thermal proximity effect depends on the amount of singly ionized helium, $x_{\rm HeII,0}$, which prevailed in the IGM before the quasar turned on, and the characteristic lifetime $t_{\rm Q}$ for which quasars shine. We find that the amplitude of the temperature boost in the quasar environment depends on $x_{\rm HeII,0}$, with a characteristic value of $ΔT \simeq 10^4\,{\rm K}$ for an initially singly ionized IGM ($x_{\rm HeII,0} = 1.0$), whereas the size of the thermal proximity zone is sensitive to quasar lifetime $t_{\rm Q}$, with typical sizes of ~100 cMpc for luminous quasars shining for $t_{\rm Q}=10^8$ yr. This temperature boost is manifest as a change in the thermal broadening of H I absorption lines near the quasar. We introduce a new method based on measuring the Ly$α$ forest power spectrum as a function of distance from the quasar, and conduct Bayesian MCMC analysis to demonstrate that the thermal proximity effect should be easily detectable. For a mock dataset of 50 quasars at z~4, we predict that one can measure $x_{\rm HeII,0}$ to a precision $\approx 0.04$, and $t_{\rm Q}$ to a precision of $\approx 0.1$ dex. By applying our formalism to existing high-resolution Ly$α$ forest spectra of quasars at $3.1 \lesssim z \lesssim 5.0$, one should be able to detect the thermal proximity effect, and reconstruct the full reionization history of He II.
description: 23 pages, 16 Figures, accepted to ApJ, two sections and one figure added
Manejo de la consulta de enfermería a pacientes hipertensos. Consulta externa.Hospital Universitario de Cartagena.
Creators: name: Gómez De Vajta, Janet
name: Muñoz De Morelos, Piedad
Publisher: name: Universidad de Cartagena
Year: 1989
Subjects: Pacientes Hipertensos - consulta
Evaluación Inicial del paciete hipertensos

description: Tesis ( Especialista en Enfermería Médico - Quirúrgica ), -- Universidad de Cartagena. Facultad de enfermería,1989
description: En este trabajo de grado la hipertensión arterial, hoy por hoy, ocupa uno de los primeros lugares en nuestra población como causa de mortalidad asociada a un proceso patológico, el cual motiva a los integrantes del sector salud a buscar estrategias seguras con calidad humana para educar esa población menos favorecida logrando estabilizar y recuperar su saud.
Messung diagnostischer Kompetenz in der Lehramtsausbildung Mathematik
Creators: name: Fey, Heiko
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2014
Subjects: subject: 510

description: Ziel des vom BMBF geförderten Projektes ist die Entwicklung und Erprobung eines Instrumentes zur Messung diagnostischer Kompetenzen von zukünftigen Lehrerinnen und Lehrern für Mathematik an Gymnasien und an beruflichen Schulen. Das Instrument soll in der ersten und in der zweiten Phase der Lehrerausbildung eingesetzt werden, um das individuelle diagnostische Wissen und Können der Studierenden und Referendare zu beschreiben und Entwicklungsfortschritte sichtbar zu machen.
Successive Convexification of Non-Convex Optimal Control Problems and Its Convergence Properties
Creators: name: Mao, Yuanqi
name: Szmuk, Michael
name: Acikmese, Behcet
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: This paper presents an algorithm to solve non-convex optimal control problems, where non-convexity can arise from nonlinear dynamics, and non-convex state and control constraints. This paper assumes that the state and control constraints are already convex or convexified, the proposed algorithm convexifies the nonlinear dynamics, via a linearization, in a successive manner. Thus at each succession, a convex optimal control subproblem is solved. Since the dynamics are linearized and other constraints are convex, after a discretization, the subproblem can be expressed as a finite dimensional convex programming subproblem. Since convex optimization problems can be solved very efficiently, especially with custom solvers, this subproblem can be solved in time-critical applications, such as real-time path planning for autonomous vehicles. Several safe-guarding techniques are incorporated into the algorithm, namely virtual control and trust regions, which add another layer of algorithmic robustness. A convergence analysis is presented in continuous- time setting. By doing so, our convergence results will be independent from any numerical schemes used for discretization. Numerical simulations are performed for an illustrative trajectory optimization example.
description: Updates: corrected wordings for LICQ. This is the full version. A brief version of this paper is published in 2016 IEEE 55th Conference on Decision and Control (CDC). http://ieeexplore.ieee.org/document/7798816/
Electromagnetically and gravitationally stealth fields
Creators: name: Quinzacara, Cristian
name: Meza, Paola
name: Sampson, Almeira
name: Valenzuela, Mauricio
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct a generic class of models for complex scalar fields -- minimally coupled to gravity and electromagnetism -- with the property that their energy-momentum tensor and the electric current vanish for certain massive configurations. These are electromagnetically and gravitationally {\it stealth fields}. We shall see that the latter configurations can affect, in addition, the strength of the gravity-matter and electromagnetic-matter couplings of other (non-stealth) modes present in the system, which turn out to be equivalent to the re-scaling the electric charge and the Newton constant (with a stealth-mass depending factor).
description: 13 pages. References and new comments have been added to this new version. The title has been changed
Charged Membranes: Poisson-Boltzmann theory, DLVO paradigm and beyond
Creators: name: Markovich, Tomer
name: Andelman, David
name: Podgornik, Rudi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this chapter we review the electrostatic properties of charged membranes in aqueous solutions, with or without added salt, employing simple physical models. The equilibrium ionic profiles close to the membrane are governed by the well-known Poisson-Boltzmann (PB) equation. We analyze the effect of different boundary conditions, imposed by the membrane, on the ionic profiles and the corresponding osmotic pressure. The discussion is separated into the single membrane case and that of two interacting membranes. For one membrane setup, we show the different solutions of the PB equation and discuss the interplay between constant-charge and constant-potential boundary conditions. A modification of the PB theory is presented to treat the extremely high counter-ion concentration in the vicinity of a charge membrane. For two equally-charged membranes, we analyze the different pressure regimes for the constant-charge boundary condition, and discuss the difference in the osmotic pressure for various boundary conditions. The non-equal charged membranes is reviewed as well, and the crossover from repulsion to attraction is calculated analytically. We then examine the charge-regulation boundary condition and discuss its effects on the ionic profiles and the osmotic pressure for two equally-charged membranes. In the last section, we briefly review the van der Waals (vdW) interactions and their effect on the free energy between two planar membranes. We explain the simple Hamaker pair-wise summation procedure, and introduce the more rigorous Lifshitz theory. The latter is a key ingredient in the DLVO theory, which combines repulsive electrostatic with attractive vdW interactions, and offers a simple explanation for colloidal or membrane stability. Finally, the chapter ends by a short account of the limitations of the approximations inherent in the PB theory.
description: 57 pages, 19 figures, From the forthcoming Handbook of Lipid Membranes: Molecular, Functional, and Materials Aspects. Edited by Cyrus Safinya and Joachim Radler, Taylor & Francis/CRC Press, 2016
Arylesterase activity is associated with antioxidant intake and paraoxonase-1 (PON1) gene methylation in metabolic syndrome patients following an energy restricted diet
Creators: name: De La Iglesia, Rocio
name: Mansego, Maria L.
name: Sánchez-Muniz, Francisco J.
name: Zulet, M. Angeles
name: Martinez, J. Alfredo
Publisher: name: Technische Universität Dortmund
Year: 2014
Subjects: subject: DNA methylation
subject: ARE
subject: PON1 gene
subject: obesity
subject: metabolic syndrome
subject: energy restriction
subject: antioxidants
subject: 610

description: The arylesterase (ARE) activity linked to the paraoxonase-1 (PON1) gene is known to protect lipoproteins from oxidation and provide defense against metabolic syndrome (MetS) and cardiovascular diseases. The epigenetic regulation of enzymatic activities is gaining importance nowadays. This research aimed to assess the potential relationships between the ARE activity with the methylation levels of the PON1 gene transcriptional regulatory region, anthropometrics, biochemical markers and antioxidant dietary components. Forty-seven subjects (47 ± 10 y.o; BMI 36.2 ± 3.8 kg/m² 46.8 % female) with MetS features, who followed a six-month energy-restricted dietary weight-loss intervention, were included in this study (www.clinicaltrials.gov; NCT01087086). Anthropometric, biochemical, enzymatic and dietary data were assessed using validated procedures. PON1 transcriptional regulatory region methylation was analyzed by a microarray technical approach. Volunteers reduced ARE activity in parallel with body weight (p = 0.005), BMI (p = 0.006), total fat mass (p = 0.020), diastolic blood pressure (p = 0.018), mean blood pressure (p = 0.022) and triglycerides (p = 0.014). Methylation levels of some CpG sites of the PON1 gene correlated negatively with ARE activity (p < 0.05). Interestingly, dietary vitamin C (p = 0.001), tocopherols (p = 0.009) and lycopene (p = 0.038) were positively associated with ARE activity and showed an inverse correlation (p = 0.004, p = 0.029 and p = 0.021, respectively) with the methylation of some selected CpG sites of the PON1 gene. In conclusion, ARE activity decreased in parallel with MetS-related markers associated to the energy restriction, while dietary antioxidants might enhance the ARE activity by lowering the PON1 gene methylation in patients with MetS features.
description: EXCLI Journal ; Vol. 13, 2014
Universality and Asymptotic Scaling in Drilling Percolation
Creators: name: Grassberger, Peter
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We present simulations of a 3-d percolation model studied recently by K.J. Schrenk et al. [Phys. Rev. Lett. 116, 055701 (2016)], obtained with a new and more efficient algorithm. They confirm most of their results in spite of larger systems and higher statistics used in the present paper, but we also find indications that the results do not yet represent the true asymptotic behavior. The model is obtained by replacing the isotropic holes in ordinary Bernoulli percolation by randomly placed and oriented cylinders, with the constraint that the cylinders are parallel to one of the three coordinate axes. We also speculate on possible generalizations.
description: 4 pages, 4 figures
A Biased Review of Biases in Twitter Studies on Political Collective Action
Creators: name: Cihon, Peter
name: Yasseri, Taha
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Computers and Society (cs.CY)
subject: Social and Information Networks (cs.SI)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: In recent years researchers have gravitated to social media platforms, especially Twitter, as fertile ground for empirical analysis of social phenomena. Social media provides researchers access to trace data of interactions and discourse that once went unrecorded in the offline world. Researchers have sought to use these data to explain social phenomena both particular to social media and applicable to the broader social world. This paper offers a minireview of Twitter-based research on political crowd behavior. This literature offers insight into particular social phenomena on Twitter, but often fails to use standardized methods that permit interpretation beyond individual studies. Moreover, the literature fails to ground methodologies and results in social or political theory, divorcing empirical research from the theory needed to interpret it. Rather, papers focus primarily on methodological innovations for social media analyses, but these too often fail to sufficiently demonstrate the validity of such methodologies. This minireview considers a small number of selected papers; we analyze their (often lack of) theoretical approaches, review their methodological innovations, and offer suggestions as to the relevance of their results for political scientists and sociologists.
description: Mini-review paper, 10 pages. Draft under review
Stufung mathematischer Kompetenzen am Ende der Sekundarstufe II – eine Konkretisierung
Creators: name: Siller, Hans-Stefan
name: Bruder, Regina
name: Linnemann, Torsten
name: Hascher, Tina
name: Sattlberger, Eva
name: Steinfeld, Jan
name: Schodl, Martin
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2014
Subjects: subject: 510

description: Um die Einordnung und Vergleichbarkeit von Prüfungsaufgaben am Ende der Sekundarstufe II im Rahmen der kompetenzorientierten standardisierten schriftlichen Reifeprüfung in Österreich (sR(D)P) zu ermöglichen, wurde eine Projektgruppe mit der Entwicklung eines Kompetenzstufenrasters beauftragt. In diesem werden die Dimensionen Operieren, Argumentieren und Modellieren auf jeweils vier Komplexitätsstufen begründet unterschieden. Im vorliegenden Beitrag werden aus dem anfänglichen Umgang mit dem Kompetenzstufenraster (Siller et al., 2013) Konsequenzen sowohl für die Kompetenzmodellierung als auch für die Entwicklung von Prüfungsaufgaben abgeleitet.
Untersuchung individueller und systemischer Wirkfaktoren auf die Rechenfertigkeit von Erstklässlern
Creators: name: Eilerts, Katja
name: Rinkens, Hans-Dieter
name: Seifert, Andreas
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2014
Subjects: subject: 510

description: Die Entwicklung der Rechenfertigkeit im Verlauf des ersten Schuljahres ist der Gegenstand einer Feldstudie mit über 2500 Schülerinnen und Schülern in 128 Klassen zu Beginn des letzten Schuljahrsquartals im Schuljahr 2010/11. Getestet werden die Additions- und Subtraktionsaufgaben im Zahlenraum bis 20 (Testdesign siehe Rinken s, 2011). Außerdem werden Merkmale der Lernumgebung wie Klassengröße, Anteil der Kinder in der Klasse mit Deutsch als Muttersprache sowie Berufserfahrung und Ausbildung der Mathematiklehrerin erhoben. Der Vortrag geht der Forschungsfrage nach, durch welche Variablen sich in dieser Feldstudie die Rechenfertigkeit bei Erstklässlern vorhersagen lässt. Da die Varianz beim Subtraktionstest deutlich größer ist als beim Additionstest, wird dieser für die Analyse herangezogen. Die Untersuchung möglicher Wirkungsfaktoren der Lernumgebung führt zu dem bemerkenswerten Ergebnis, dass diese nur einen ganz geringen Teil der Varianz bei der Lösungshäufigkeit aufklären.
A Lipschitz Matrix for Parameter Reduction in Computational Science
Creators: name: Hokanson, Jeffrey M.
name: Constantine, Paul G.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 26B35, 62K05, 68Q25

description: We introduce the Lipschitz matrix: a generalization of the scalar Lipschitz constant for functions with many inputs. Among the Lipschitz matrices compatible a particular function, we choose the smallest such matrix in the Frobenius norm to encode the structure of this function. The Lipschitz matrix then provides a function-dependent metric on the input space. Altering this metric to reflect a particular function improves the performance of many tasks in computational science. Compared to the Lipschitz constant, the Lipschitz matrix reduces the worst-case cost of approximation, integration, and optimization; if the Lipschitz matrix is low-rank, this cost no longer depends on the dimension of the input, but instead on the rank of the Lipschitz matrix defeating the curse of dimensionality. Both the Lipschitz constant and matrix define uncertainty away from point queries of the function and by using the Lipschitz matrix we can reduce uncertainty. If we build a minimax space-filling design of experiments in the Lipschitz matrix metric, we can further reduce this uncertainty. When the Lipschitz matrix is approximately low-rank, we can perform parameter reduction by constructing a ridge approximation whose active subspace is the span of the dominant eigenvectors of the Lipschitz matrix. In summary, the Lipschitz matrix provides a new tool for analyzing and performing parameter reduction in complex models arising in computational science.
Coercivity condition for higher order moments for nonlinear SPDEs and existence of solution under local monotonicity
Creators: name: Neelima
name: Šiška, David
Publisher: name: arXiv
Year: 2016
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60H15, 65M60, 47J35

description: Higher order moment estimates for solutions to nonlinear SPDEs governed by locally-monotone operators are obtained under appropriate coercivity condition. These are then used to extend known existence and uniqueness results for nonlinear SPDEs under local monotonicity conditions to allow derivatives in the operator acting on the solution under the stochastic integral.
description: 32 pages
De la adopción
Creators: name: Flórez De Hernández, Carmen
Publisher: name: Universidad de Cartagena
Year: 1983
Subjects: Adopción - Colombia
Derecho de familia - Colombia
Legislación en adopción - Colombia

description: Tesis (Abogado) -- Universidad de Cartagena. Facultad de Derecho y Ciencias Políticas. Programa de Derecho, 1983
description: Tema importante en el derecho de familia, ya que constituye en el estandarte de la niñez desamparada, analizando normas vigentes e interpretaciones dadas sobre las mismas, en su convenzo humano, contribuyendo en el campo formativo, de conjunto humano-jurídico.
Two Roads Diverged: A Semantic Network Analysis of Guanxi on Twitter
Creators: name: Yan, Pu
name: Yasseri, Taha
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Computers and Society (cs.CY)
subject: Social and Information Networks (cs.SI)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Guanxi, roughly translated as "social connection", is a term commonly used in the Chinese language. In this research, we employed a linguistic approach to explore popular discourses on Guanxi. Although sharing the same Confucian roots, Chinese communities inside and outside Mainland China have undergone different historical trajectories. Hence, we took a comparative approach to examine guanxi in Mainland China and in Taiwan, Hong Kong, and Macau (TW-HK-M). Comparing guanxi discourses in two Chinese societies aims at revealing the divergence of guanxi culture. The data for this research were collected on Twitter over a three-week period by searching tweets containing guanxi written in Simplified Chinese characters and in Traditional Chinese characters. After building, visualising, and conducting community detection on both semantic networks, two guanxi discourses were then compared in terms of their major concept sub-communities. This research aims at addressing two questions: Has the meaning of guanxi transformed in contemporary Chinese societies? And how do different socio-economic configurations affect the practice of guanxi? Results suggest that guanxi in interpersonal relationships has adapted to a new family structure in both Chinese societies. In addition, the practice of guanxi in business varies in Mainland China and in TW-HK-M. Furthermore, an extended domain was identified where guanxi is used in a macro-level discussion of state relations. Network representations of the guanxi discourses enabled reification of the concept and shed lights on the understanding of social connections and social orders in contemporary China.
description: under review. 29 pages + supplementary information
Medición y evaluación del desempeño del recurso humano en la dirección ejecutiva de administración judicial seccional Cartagena
Creators: name: González, Luz Helena
name: Vega, Nazly
Publisher: name: Universidad de Cartagena
Year: 2002
Subjects: Recursos humanos
Planificación de los recursos humanos
Administración de personal

description: Tesis (Administrador de Empresas) -- Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración de Empresas, 2002
description: El presente estudio tiene por objeto contribuir al establecimiento de un modelo de medición y evaluación del desempeño del recurso humano que permita lograr una mayor eficiencia del personal en su trabajo en función de la organización, e conjunto con su desarrollo y crecimiento personal.
Análisis de la teoría de las expectativas de Victor Vroom en el centro de emprendimiento y desarrollo Pedro Romero "Cemprende"
Creators: name: Marrugo Marrugo, Mara Milena
name: Pérez Melendez, Belkys Paola
Publisher: name: Universidad de Cartagena
Year: 2012
Subjects: Administración de personal
Recursos humanos
Talento humano

description: Tesis (Administrador de Empresas).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración de Empresas, 2012
description: La calidad de vida laboral en las organizaciones, así como el recurso humano de las mismas, representan factores de gran importancia para la organización. Debido a que son éstos, los que marcan el paso de la productividad de la empresa como tal en consecuencia son las expectativas del recurso humano para con la organización y para consigo mismo, quienes determinarán el grado de compromiso de dichos entes para con la organización. Por lo anterior es necesario inquietarse y esmerarse por mantener el buen ambiente laboral, a medida que se satisfacen las necesidades personales del los colaboradores de la empresa. A partir de la observación directa, sobre el comportamiento del recurso humano en la empresa CEMPRENDE, quienes en su mayoría, laboran en función de objetivos organizacionales, pudimos determinar, que sus objetivos y metas personales, influyen en gran medida el desenvolvimiento de los mismos dentro de la organización. El presente trabajo tiene por objeto analizar la aplicación de la teoría de las expectativas de Víctor Vroom para determinar su grado de contribución al logro de los objetivos organizacionales y personales en el centro de emprendimiento Pedro Romero CEMPRENDE
Information-theoretic measures for non-linear causality detection: application to social media sentiment and cryptocurrency prices
Creators: name: Keskin, Z.
name: Aste, T.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: General Finance (q-fin.GN)
subject: FOS: Physical sciences
subject: FOS: Economics and business

description: Information transfer between time series is calculated by using the asymmetric information-theoretic measure known as transfer entropy. Geweke's autoregressive formulation of Granger causality is used to find linear transfer entropy, and Schreiber's general, non-parametric, information-theoretic formulation is used to detect non-linear transfer entropy. We first validate these measures against synthetic data. Then we apply these measures to detect causality between social sentiment and cryptocurrency prices. We perform significance tests by comparing the information transfer against a null hypothesis, determined via shuffled time series, and calculate the Z-score. We also investigate different approaches for partitioning in nonparametric density estimation which can improve the significance of results. Using these techniques on sentiment and price data over a 48-month period to August 2018, for four major cryptocurrencies, namely bitcoin (BTC), ripple (XRP), litecoin (LTC) and ethereum (ETH), we detect significant information transfer, on hourly timescales, in directions of both sentiment to price and of price to sentiment. We report the scale of non-linear causality to be an order of magnitude greater than linear causality.
description: 12 pages, 7 figures, 1 table
Reestructuración administrativa del club de profesionales Universitarios de Cartagena
Creators: name: Barrios T, Rosa
name: De La Ossa, Yadira
Publisher: name: Universidad de Cartagena
Year: 1988
Subjects: Manual de funciones - Club de Profesionales Universitarios de Cartagena, (Bolívar)
Reestructuración administrativa - Club de Profesionales Universitarios de Cartagena, (Bolívar)

description: Tesis (Administrador de Empresas).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración de Empresas, 1988
description: El presente estudio tiene por objeto realizar una reestructuración administrativa al Club de Profesionales de Cartagena, mediante la elaboración de ciertos instrumentos administrativos que se rain de gran utilidad para los directivos y por consiguiente para la organización.
Dynamics and Biases of Online Attention: The Case of Aircraft Crashes
Creators: name: García-Gavilanes, Ruth
name: Tsvetkova, Milena
name: Yasseri, Taha
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Computers and Society (cs.CY)
subject: Social and Information Networks (cs.SI)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The Internet not only has changed the dynamics of our collective attention, but also through the transactional log of online activities, provides us with the opportunity to study attention dynamics at scale. In this paper, we particularly study attention to aircraft incidents and accidents using Wikipedia transactional data in two different language editions, English and Spanish. We study both the editorial activities on and the viewership of the articles about airline crashes. We analyse how the level of attention is influenced by different parameters such as number of deaths, airline region, and event locale and date. We find evidence that the attention given by Wikipedia editors to pre-Wikipedia aircraft incidents and accidents depends on the region of the airline for both English and Spanish editions. North American airline companies receive more prompt coverage in English Wikipedia. We also observe that the attention given by Wikipedia visitors is influenced by the airline region but only for events with high number of deaths. Finally we show that the rate and time span of the decay of attention is independent of the number of deaths and a fast decay within about a week seems to be universal. We discuss the implications of these findings in the context of attention bias.
description: Accepted for publication in Royal Society Open Science
Evaluación de la amenaza geológica potencial del volcanismo de lodo en la vereda de Membrillal - Distrito Turístico y Cultural de Cartagena De Indias
Creators: name: Bautista Manga, Leidy Ana
name: Rada López, Deibys
Publisher: name: Universidad de Cartagena
Year: 2015
Subjects: Ingeniería geológica
Amenaza geológica

description: Tesis (Ingeniero Civil).--Universidad de Cartagena. Facultad de Ciencias E Ingenierías. Programa de Ingeniería Civil, 2015
description: Los escenarios de amenaza geológica potencial, se debe concientizar a la comunidad y al gobierno, de la amenaza potencial a la que está expuesta la población de Membrillal. Esta área de estudio tiene sectores marginados y vulnerables, es geográficamente una zona de alto riesgo, ha tenido desplazamiento de terreno, derrumbes y emanaciones de lodo y gases. Su principal objetivo, evaluar la amenaza geológica potencial del volcanismo de lodo en la vereda de Membrillal-distrito de Cartagena, mediante el análisis de la información recolectada, para determinar los factibles escenarios de riesgo potencial con base a comparación del comportamiento geológico de los diferentes volcanes de lodo del caribe colombiano, para elaborar planes de prevención y control de desastres.
Assessment of Monitoring and Evaluation Systems of Promoting Basic Services-III and Enhancing Shared Prosperity through Equitable Services Programs in Ethiopia
Creators: name: Gebrehiwot, Fikre
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: This project work focuses on the assessment of monitoring and evaluation systems of an ongoing development programs namely Protecting (Promoting) Basic Services-PBS and Enhancing Shared Prosperity through Equitable Services-ESPES. These programs are primarily owned and implemented by the GoE and significantly funded by DPs (bilateral and multilateral) in a coordinated manner. Both of the programs focus on the delivery of basic services such as education, health, agricultural productivity, water and rural roads. The DPs provide one-fourth or one-third of the recurrent budget for the provision of the services. Apart from the basic services, social accountability, financial transparency and civic engagement are also the focus of the programs. The fund from the donors is transferred using intergovernmental fiscal transfer from MoFEC all the way through WoFECs or KoFECs as part the decentralized system of service delivery. The theme of this work is to look at the M&E systems put in place to monitor and evaluate the implementation of the jointly funded program. The paper has five chapters, and the first one includes the background, problem statement, objectives, justifications and the methodology used. The second chapter is all about the concepts of monitoring, and evaluation, program, development programs, models of and approaches to evaluation, program evaluation, processes of program evaluation and models of program evaluation. The third chapter is about aid, development aid or assistance from global to the national context as discussed briefly. The fourth chapter is focused on discussing about the programs in general and the M&E systems in particular, based on the data collected from key informants and the relevant documents . It is more of a qualitative explanation of the existing M&E systems, tools and mechanisms as witnessed from the DPs, GoE and their joint efforts. The final chapter has the conclusion and recommendation parts.
title: Integrated Analysis of the Epigenome in Alzheimer’s Disease Brains and during Ageing
Creators: name: Kraus, Theo Franz Josef
name: Gasparoni, Gilles
name: Bultmann, Sebastian
name: Vlcek, Julia
name: Leonhardt, Heinrich
name: Walter, Jörn
name: Kretzschmar, Hans
Publisher: name: German Medical Science GMS Publishing House
Year: 2015
Subjects: subject: 610 Medical sciences; Medicine

description: Background: The epigenome exerts essential influence on regulation of cellular proliferation and differentiation. One of the most important fields in epigenome research is the investigation of DNA methylation. It is known that a 5-methylation of cytosine by DNA-methyltransferases within the promoter[for full text, please go to the a.m. URL]
description: 60th Annual Meeting of the German Society for Neuropathology and Neuroanatomy (DGNN)
Invariants of 4-manifolds from Khovanov-Rozansky link homology
Creators: name: Morrison, Scott
name: Walker, Kevin
name: Wedrich, Paul
Publisher: name: arXiv
Year: 2019
Subjects: subject: Quantum Algebra (math.QA)
subject: Category Theory (math.CT)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57K18 (Primary), 57K16, 57K41 (Secondary)

description: We use Khovanov-Rozansky gl(N) link homology to define invariants of oriented smooth 4-manifolds, as skein modules constructed from certain 4-categories with well-behaved duals. The technical heart of this construction is a proof of the sweep-around property, which makes these link homologies well defined in the 3-sphere.
description: 34 pages, many figures, v5: published in Geometry & Topology, page numbers differ
Understanding Communication Patterns in MOOCs: Combining Data Mining and qualitative methods
Creators: name: Eynon, Rebecca
name: Hjorth, Isis
name: Yasseri, Taha
name: Gillani, Nabeel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computers and Society (cs.CY)
subject: Social and Information Networks (cs.SI)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Massive Open Online Courses (MOOCs) offer unprecedented opportunities to learn at scale. Within a few years, the phenomenon of crowd-based learning has gained enormous popularity with millions of learners across the globe participating in courses ranging from Popular Music to Astrophysics. They have captured the imaginations of many, attracting significant media attention - with The New York Times naming 2012 "The Year of the MOOC." For those engaged in learning analytics and educational data mining, MOOCs have provided an exciting opportunity to develop innovative methodologies that harness big data in education.
description: Preprint of a chapter to appear in "Data Mining and Learning Analytics: Applications in Educational Research"