cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Poly-Symmetry in Processor-Sharing Systems
Creators: name: Bonald, Thomas
name: Comte, Céline
name: Shah, Virag
name: de Veciana, Gustavo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Performance (cs.PF)
subject: FOS: Computer and information sciences
subject: 60K25 Queueing theory, 68M20 Performance evaluation, queueing, scheduling, 90B15 Network models, stochastic

description: We consider a system of processor-sharing queues with state-dependent service rates. These are allocated according to balanced fairness within a polymatroid capacity set. Balanced fairness is known to be both insensitive and Pareto-efficient in such systems, which ensures that the performance metrics, when computable, will provide robust insights into the real performance of the system considered. We first show that these performance metrics can be evaluated with a complexity that is polynomial in the system size if the system is partitioned into a finite number of parts, so that queues are exchangeable within each part and asymmetric across different parts. This in turn allows us to derive stochastic bounds for a larger class of systems which satisfy less restrictive symmetry assumptions. These results are applied to practical examples of tree data networks, such as backhaul networks of Internet service providers, and computer clusters.
Was wird zum Erklären gelernt? Konstitution eines Lerngegenstands in der Klasseninteraktion
Creators: name: Erath, Kirstin
name: Prediger, Susanne
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2014
Subjects: subject: 510

description: Erklären lernt man im Mathematikunterricht nicht durch Instruktion oder reine Konstruktion, sondern in den Interaktionen zwischen allen Beteiligten. Doch was genau wird in den jeweiligen Klassen dazu tatsächlich gelernt? Ist der Lerngegenstand überhaupt in allen Klassen gleich? Wenn nicht, inwiefern unterscheidet er sich? Die interdisziplinäre Videostudie INTERPASS untersucht Mathematik- und Deutschklassen des 5. Jahrgangs im Hinblick auf mikrokulturell etablierte sprachliche Praktiken (120 h Video). Die Konzeptualisierung von Erklärpraktiken als Navigieren durch epistemische Felder ermöglicht die Erfassung der fachkulturell-epistemischen Dimension einer solchen Praktik (Prediger & Erath 2014; Erath & Prediger 2014). Der Beitrag skizziert an zwei Fallbeispielen die Kontingenzen zwischen in verschiedenen Mikrokulturen etablierten Praktiken.
Forecasting Postoperative Delirium in Older Adult Patients with Fast-and-Frugal Decision Trees
Creators: name: Heinrich, Maria
name: Woike, Jan K.
name: Spies, Claudia D.
name: Wegwarth, Odette
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2022
Subjects: subject: fast-and-frugal decision trees
subject: postoperative outcomes
subject: postoperative delirium
subject: clinical data prediction
subject: medical decision making
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: Postoperative delirium (POD) is associated with increased complication and mortality rates, particularly among older adult patients. However, guideline recommendations for POD detection and management are poorly implemented. Fast-and-frugal trees (FFTrees), which are simple prediction algorithms, may be useful in this context. We compared the capacity of simple FFTrees with two more complex models-namely, unconstrained classification trees (UDTs) and logistic regression (LogReg)-for the prediction of POD among older surgical patients in the perioperative setting. Models were trained and tested on the European BioCog project clinical dataset. Based on the entire dataset, two different FFTrees were developed for the pre-operative and postoperative settings. Within the pre-operative setting, FFTrees outperformed the more complex UDT algorithm with respect to predictive balanced accuracy, nearing the prediction level of the logistic regression. Within the postoperative setting, FFTrees outperformed both complex models. Applying the best-performing algorithms to the full datasets, we proposed an FFTree using four cues (Charlson Comorbidity Index (CCI), site of surgery, physical status and frailty status) for the pre-operative setting and an FFTree containing only three cues (duration of anesthesia, age and CCI) for the postoperative setting. Given that both FFTrees contained considerably fewer criteria, which can be easily memorized and applied by health professionals in daily routine, FFTrees could help identify patients requiring intensified POD screening.
Bayesian inference of non-positive spectral functions in quantum field theory
Creators: name: Rothkopf, Alexander
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We present the generalization to non positive definite spectral functions of a recently proposed Bayesian deconvolution approach (BR method). The novel prior used here retains many of the beneficial analytic properties of the original method, in particular it allows us to integrate out the hyperparameter $α$ directly. To preserve the underlying axiom of scale invariance, we introduce a second default-model related function, whose role is discussed. Our reconstruction prescription is contrasted with existing direct methods, as well as with an approach where shift functions are introduced to compensate for negative spectral features. A mock spectrum analysis inspired by the study of gluon spectral functions in QCD illustrates the capabilities of this new approach.
description: 14 pages, 15 figures
Elaboration of Acylsulfonohydrazides into Selective Tools to Probe MYST HAT Function
Creators: name: SUN, YUXIN
Publisher: name: Monash University
Year: 2021
Subjects: Organic chemistry not elsewhere classified

description: Acute myeloid leukemia (AML) is a type of bone marrow cancer, with a low survival rate, and leukemia stem cells (LSC) is a major factor in the development of AML. Histone acetyltransferase (HAT) enzymes are essential for a wide range of normal cellular processes, including cell proliferation and DNA replication. Specifically, two HAT enzymes, MOZ and HBO1, have been identified as critical regulators for the maintenance of LSC. My project is focused on the synthesis, and biological testing of small drug molecules to inhibit MOZ and HBO1 as epigenetic targets, as a potential treatment for AML and other chronic diseases.
Stratification and the comparison between homological and tensor triangular support
Creators: name: Barthel, Tobias
name: Heard, Drew
name: Sanders, Beren
Publisher: name: arXiv
Year: 2021
Subjects: subject: Algebraic Topology (math.AT)
subject: Algebraic Geometry (math.AG)
subject: Category Theory (math.CT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 18F99

description: We compare the homological support and tensor triangular support for `big' objects in a rigidly-compactly generated tensor triangulated category. We prove that the comparison map from the homological spectrum to the tensor triangular spectrum is a bijection and that the two notions of support coincide whenever the category is stratified, extending work of Balmer. Moreover, we clarify the relations between salient properties of support functions and exhibit counter-examples highlighting the differences between homological and tensor triangular support.
description: 18 pages, comments welcome. v2 - updated to include referee comments. Version to appear in The Quarterly Journal of Mathematics
title: Mexican Education Quality Standards in private schools: Perspectives from Students, Teachers and Administrators
Creators: name: Ramirez, Yazmin
Publisher: name: University of Liverpool Repository
Year: 2023

description: Abstract Even though the education sector has established several successful strategies for boosting the comprehension of Mexican students, little advancement has been achieved in quality assurance processes and international accreditation at a high-school level to contribute to higher education standards. Mexican educational institutions are looking for innovative and creative ways to improve quality standards while implementing different methods and frameworks to assure they are able to compete in the 21st century. This is in response to students graduating from high school without skills required to be contributors to society's advancement at the technological, economic, social and human levels. In an effort to achieve excellence, private high schools across the country are pursuing international accreditation which endorses excellence in education through robust quality assurance and accountability. The process of an international accreditation involves rigorous procedures, including self-evaluation by all stakeholders and members of the education community, including students, teachers, alumni, parents, and administration to evaluate their vision and mission. One could question if the use of international quality standards are appropriate in a developing country. The purpose was to critically examine and analyse the perspectives of students, teachers and administrators on quality standards and the accreditation process. This study was examined through an Appreciative Inquiry lensed using a mixed method approach. Semi-structured interviews and surveys were used as data collection tools with students, teachers and administrators from a prestigious group of 4 private Mexican high schools, across 4 states in Mexico. A total of 385 students, 74 teachers, and administrators answered a survey about their perceptions of quality and academic excellence in their institutions. For this purpose, 4 senior teachers/administrators and 15 students were interviewed. The study concludes with a conceptualization of academic quality from a local perspective of students, teachers and administrators infused with a bottom-up approach to give a voice and promote agency among stakeholders to complement a national and international accreditation process. The contribution to the field suggests having more contextualised quality standards to foster deeper understanding and avoid the one-fits-all paradigm of standardisation of academic quality. Keywords: international accreditation, quality standards, private high schools, academic excellence, creativity, and innovation.
Assessment of Project Implementation Challenges and Conceivable Means of Resolution in Replacing the New Core Banking System in Wegagen Bank S.C.
Creators: name: Gebeyehu, Azmeraw
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2019

description: The purpose of this research is assessment of implementation challenges and conceivable means of resolution in replacing the existing core banking system in Wegagen Bank S.C. Thus the researcher came up with a major research gap of which driving factors are pushed banks to replace the CBS, what factors having implications on project success and finally what are the strategies to avoid or reduce the challenges on the project progress. Raising research questions on the driving issues of CBS replacement project, different challenging factors on the process and overcoming strategies on the project progress were entertained to fulfill the objectives of the study. The data collection tools were questionnaires. The study was conducted on a census survey. Research questionnaires were distributed for all 32 members in the project office and individuals who participated in the data cleaning and migration process at branch level and 28 were returned back on time. The response rate was 87.5%. The findings of the study revealed that there is a drive factors that Wegagen Bank S.C. are replaced their core banking system (Omni Enterprise CBS) by the new Oracle Flex Cube Core banking system. New customer centric strategies requiring new technologies, to cope up with competition and organic growth in customer numbers and product range are driving factors for the bank. Whereas, the findings reveled also that data migration, understanding the function of the new core system environment and complexity of legacy system integration are a major challenges for the project. Generally, the outcome of the research confirmed that good cooperation and communication with the implementation partners, close interaction of business and IT, training the staff on skill gap and the bank culture has positive impact on the core banking system replacement project. Finally, recommendations are outlined at the end on what actions should be taken to improve this practice
El crédito agrícola como factor de desarrollo en el Departamento de Bolivar
Creators: name: Martinez M., Antonio C.
name: Ballestas C., Humberto
Publisher: name: Universidad de Cartagena
Year: 1972
Subjects: Crédito agrícola

description: Tesis (Economista).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Economía, 1972
description: El presente trabajo tiene como objetivo, detectar mediante análisis científico y objetivo, que la Caja de Crédito Agrario Industrial y demás fuentes crediticias y financieras puedan desempeñar un papel fundamental en el desarrollo y aplicación del crédito Agrícola en el Departamento de Bolívar, ayudando de esta manera a la solvencia económica t financiera de los campesinos.
title: Scratch von Anfang an
title: Programmieren als begleitendes Werkzeug im mathematischen Unterricht der Sekundarstufe
titleType: AlternativeTitle
Creators: name: Förster, Klaus-Tycho
Publisher: name: Gesellschaft für Didaktik der Mathematik
Year: 2014
Subjects: subject: 510

description: Die Programmierung ist heutzutage weitgehend aus dem mathematischen Unterricht verschwunden (vergl. etwa Oldenburg 2011), eine nicht nur nach Kortenkamp 2005 bedauerliche Entwicklung, denn „Konzepte wie Schleifen, Prozeduren und insbesondere Variablen sind eigentlich unabdingbar“. Gerade für die fundamentale Idee der Algorithmen ist die Programmierung hilfreich, insbesondere für die Überprüfung auf Korrektheit und formale Präzisierung. Die Wichtigkeit von Algorithmen ist nicht auf die Mathematik und Informatik beschränkt: Algorithmen sind „fächerübergreifend und alltagsrelevant“ (Schmidt-Thieme 2005). Zudem unterstützt die Programmierung beim Problemlösen, denn sie bietet eine gemeinsame formale Sprache. Somit kann man über Programme leichter reden: Über ihre Struktur, ihre Entwicklung und ihre Beziehungen zu anderen Problemen und Programmen (siehe u.a. Feurzeig und Papert 1969). Analog zu einer Funktion führt ein Computerprogramm eine Transformation von einer Eingabe (Argument) zu einer Ausgabe (Wert) durch (vergl. etwa Puhlmann 1998). Somit kann die Aufgabe, im Unterricht ein Programm zu schreiben, mit einer Beweisaufgabe verglichen werden. Gegebenes und Gesuchtes sind bekannt, die Transformation aber nicht, siehe Strecker 2009. Der Entwurf eines korrekten Programms entspricht einem direkten (konstruktiven) Beweis. Da Beweisaufgaben im Mathematikunterricht leider unterrepräsentiert sind (z.T. nur 1%, Neubrand 2002), bietet sich die Programmierung unmittelbar für das alltägliche Unterrichtsrepertoire an.
Lattice-motivated holomorphic nearly perturbative QCD
Creators: name: Ayala, Cesar
name: Cvetic, Gorazd
name: Kogerler, Reinhart
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Newer lattice results indicate that, in the Landau gauge at low spacelike momenta, the gluon propagator and the ghost dressing function are finite nonzero. This leads to a definition of the QCD running coupling, in a specific scheme, that goes to zero at low spacelike momenta. We construct a running coupling which fulfills these conditions, and at the same time reproduces to a high precision the perturbative behavior at high momenta. The coupling is constructed in such a way that it reflects qualitatively correctly the holomorphic (analytic) behavior of spacelike observables in the complex plane of the squared momenta, as dictated by the general principles of Quantum Field Theories. Further, we require the coupling to reproduce correctly the nonstrange semihadronic decay rate of tau lepton which is the best measured low-momentum QCD observable with small higher-twist effects. Subsequent application of the Borel sum rules to the V+A spectral functions of tau lepton decays, as measured by OPAL Collaboration, determines the values of the gluon condensate and of the V+A 6-dimensional condensate, and reproduces the data to a significantly higher precision than the usual MSbar running coupling.
description: v4: 23 pages, 9 figures; improved discussion; new Sec.V and new references added; version to appear in J.Phys.G
Diagnóstico de las geoamenazas que afectan las cuencas hidrográficas de los ríos Gaira, Manzanares y Piedras y su incidencia en los planes de ordenamiento y manejo de cuencas(POMCA)
Creators: name: Babilonia Franco, Kellys Johana
name: García Álvarez, Leonardo Andrés
Publisher: name: Universidad de Cartagena
Year: 2012
Subjects: Ingeniería geológica
Amenaza geológica
Movimiento en masa

description: Tesis(Ingeniero Civil).-Universidad de Cartagena .Facultad de Ciencia E Ingenierías.Programa de Ingeniería Civil, 2012
description: El objeto de este proyecto es la elaboración de un diagnóstico de las geoamenazas que afectan a las cuencas hidrográficas de los ríos Gaira, Manzanares y Piedras ubicadas en el municipio de Santa Marta, de conformidad con los lineamientos establecidos en los planes de ordenamiento y manejo de cuencas (POMCA) descritos en el Decreto 1729 de 2002 con la finalidad de preservar y velar por la adecuada explotación de los recursos en las cuencas hidrográficas. Se recopiló información técnica de estudios hechos en la zona de las cuencas hidrográficas de los ríos mencionados que comprenden un área total de 39878 Ha. Gran parte de la información fué suministrada por el convenio existente entre la Universidad de Cartagena y CORPAMAG. Luego se utilizó el sistema semicuantitativo de evaluación de estabilidad de zonas homogéneas de Ramírez y González ,2004; donde se evaluaron los parámetros tales como Material, Relieve, Drenaje, Vegetación, Clima, Sismicidad, Erosión y Efecto antrópico a través de la clasificación de estabilidad, con el fin último de obtener el mapa de geoamenazas para cada una de las cuencas hidrográficas permitiendo así conocer el grado de susceptibilidad y de amenaza presente Por otra parte, dentro de las problemáticas más frecuentes en las tres cuencas hidrográficas está la inestabilidad del terreno por erosión y movimientos en masas, contemplados en el Plan de Ordenamiento territorial de una forma muy general y poco profunda. Geológicamente las cuencas destacan la presencia de batolito de Santa Marta y Plutón de Buritaca, además, el relieve montañoso es el que predomina en la parte alta y media de las cuencas pero en la parte baja generalmente son planicies La susceptibilidad a los movimientos en masa es moderada en las cuencas de los ríos Gaira y Piedras arrojando porcentajes de 73% y 78% respectivamente y baja en la cuenca del rio Manzanares con un 60%.Ademas, el grado de amenaza media para la cuenca del río Manzanares y Piedras es de 59.8% y 63.8% respectivamente, y en la cuenca del río Gaira grado de amenaza medio de 58.9%. En conclusión el diagnóstico de las amenazas geológicas con ayudas tecnológicas como los sistemas de información geográfico y metodologías semicuantitativas son herramientas válidas y pertinentes en la prevención y alternativas de mitigación de estos fenómenos.
Deep Convolutional Correlation Iterative Particle Filter for Visual Tracking
Creators: name: Mozhdehi, Reza Jalil
name: Medeiros, Henry
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: This work proposes a novel framework for visual tracking based on the integration of an iterative particle filter, a deep convolutional neural network, and a correlation filter. The iterative particle filter enables the particles to correct themselves and converge to the correct target position. We employ a novel strategy to assess the likelihood of the particles after the iterations by applying K-means clustering. Our approach ensures a consistent support for the posterior distribution. Thus, we do not need to perform resampling at every video frame, improving the utilization of prior distribution information. Experimental results on two different benchmark datasets show that our tracker performs favorably against state-of-the-art methods.
description: 25 pages, 10 figures, 1 table
Herschel-ATLAS: Revealing dust build-up and decline across gas, dust and stellar mass selected samples: I. Scaling relations
Creators: name: De Vis, P.
name: Dunne, L.
name: Maddox, S.
name: Gomez, H. L.
name: Clark, C. J. R.
name: Bauer, A. E.
name: Viaene, S.
name: Schofield, S. P.
name: Baes, M.
name: Baker, A. J.
name: Bourne, N.
name: Driver, S. P.
name: Dye, S.
name: Eales, S. A.
name: Furlanetto, C.
name: Ivison, R. J.
name: Robotham, A. S. G.
name: Rowlands, K.
name: Smith, D. J. B.
name: Smith, M. W. L.
name: Valiante, E.
name: Wright, A. H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a study of the dust, stars and atomic gas (HI) in an HI-selected sample of local galaxies (z<0.035) in the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) fields. This HI-selected sample reveals a population of very high gas fraction (>80 per cent), low stellar mass sources that appear to be in the earliest stages of their evolution. We compare this sample with dust and stellar mass selected samples to study the dust and gas scaling relations over a wide range of gas fraction (proxy for evolutionary state of a galaxy). The most robust scaling relations for gas and dust are those linked to NUV-r (SSFR) and gas fraction, these do not depend on sample selection or environment. At the highest gas fractions, our additional sample shows the dust content is well below expectations from extrapolating scaling relations for more evolved sources, and dust is not a good tracer of the gas content. The specific dust mass for local galaxies peaks at a gas fraction of ~75 per cent. The atomic gas depletion time is also longer for high gas fraction galaxies, opposite to the trend found for molecular gas depletion timescale. We link this trend to the changing efficiency of conversion of HI to H2 as galaxies increase in stellar mass surface density as they evolve. Finally, we show that galaxies start out barely obscured and increase in obscuration as they evolve, yet there is no clear and simple link between obscuration and global galaxy properties.
description: 16 pages (+11 pages appendix), 12 figures, Published in 2017 in MNRAS, 464, 4680; This version 2 has corrected a small error in the table heading of Table 1, but is otherwise unchanged
Implantación de un programa de seguridad industrial Imec Ltda. (Industrias metalmecanica de la costa Ltda)
Creators: name: Arrieta Saa, Dolores Marina
name: Mouthon Contreras, Rocio Esther
Publisher: name: Universidad de Cartagena
Year: 1990
Subjects: Seguridad industrial
Imec Ltda - Implantación de programa de seguridad industrial

description: Tesis (Administrador de Empresas).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración de Empresas, 1990
description: El presente estudio tiene por objeto la elaboración de un programa de seguridad industrial para la empresa Imec Ltda. y aportar los medios necesarios para desarrollar las medidas básicas de seguridad e higiene.
The Role Of Procurement Contract Management In The Effectiveness Of Project Management For Ethiopian Electric Power: The Case Of Addis North Substation Rehabilitation And Upgrading Project
Creators: name: Mekonnen, Yehualawork
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: In today's competitive and hectic global economy effective contract management is paramount for effectiveness of project management to guarantees organization in realizing its business value by successful delivering projects on time and within budget. The aim of this study is to assess the role of procurement contract management in affecting the effectiveness of project management at Addis North Substation Rehabilitation and Upgrading Project. Research was executed by means of questionnaires and interviews where employees from Procurement, Logistics and Warehousing Department, Substation operation staffs, and Project office staffs were invited to share their experiences of the same. The Literature acknowledges the importance of contract management for effective Project management by citing important terms and conditions for good contracts. They also spell out the basis for supplier selection, remedies for breach of project contracts, service level agreements, contract as a project risks management tool as well as supplier relationship matrix. This research has discovered that there is a very high dependency of effective project management on suppliers' compliance with terms and conditions, suppliers' technical capability and close monitoring of suppliers during project implementation. Therefore, contract management is essential for effective project management. The researcher recommends Ethiopian Electric Power to recruit more experienced and qualified staff for its contract management function, to have e-contract management solution in order to have visibility of its active contracts at every stage of the project lifecycle, to have strong technical supplier evaluation and to secure and enforce penalty clauses for suppliers' breach of project contracts. This is because Ethiopian Electric Power improves its ability to manage its project contracts at practically every stage of project life-cycle, the more it can transform contracting into a project management competency.
Testing for change-points in long-range dependent time series by means of a selfnormalized Wilcoxon test
Creators: name: Betken, Annika
Publisher: name: Technische Universität Dortmund
Year: 2014
Subjects: subject: change-point problem
subject: non- parametric test
subject: Wilcoxon test
subject: long-range dependence
subject: self-normalization
subject: 310
subject: 330
subject: 620

description: We propose a testing procedure based on the Wilcoxon two-sample test statistic in order to test for change-points in the mean of long-range dependent data. We show that the corresponding self-normalized test statistic converges in distribution to a non-degenerate limit under the hypothesis that no change occurred and that it diverges to infinity under the alternative of a change-point with constant height. Furthermore, we derive the asymptotic distribution of the self-normalized Wilcoxon test statistic under local alternatives, that is under the assumption that the height of the level shift decreases as the sample size increases. Regarding the finite sample performance, simulation results confirm that the self-normalized Wilcoxon test yields a consistent discrimination between hypothesis and alternative and that its empirical size is already close to the significance level for moderate sample sizes.
description: Discussion Paper / SFB 823;30/2014
Moment-based density and risk estimation from grouped summary statistics
Creators: name: Lambert, Philippe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Data on a continuous variable are often summarized by means of histograms or displayed in tabular format: the range of data is partitioned into consecutive interval classes and the number of observations falling within each class is provided to the analyst. Computations can then be carried in a nonparametric way by assuming a uniform distribution of the variable within each partitioning class, by concentrating all the observed values in the center, or by spreading them to the extremities. Smoothing methods can also be applied to estimate the underlying density or a parametric model can be fitted to these grouped data. For insurance loss data, some additional information is often provided about the observed values contained in each class, typically class-specific sample moments such as the mean, the variance or even the skewness and the kurtosis. The question is then how to include this additional information in the estimation procedure. The present paper proposes a method for performing density and quantile estimation based on such augmented information with an illustration on car insurance data.
Shock Wave Interactions and the Riemann-flat Condition: The Geometry behind Metric Smoothing and the Existence of Locally Inertial Frames in General Relativity
Creators: name: Reintjes, Moritz
name: Temple, Blake
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 83C75 (Primary), 76L05 (Secondary)

description: We prove that the essential smoothness of the gravitational metric at shock waves in GR, a PDE regularity issue for weak solutions of the Einstein equations, is determined by a geometrical condition which we introduce and name the {\it Riemann-flat condition}. The Riemann-flat condition determines whether or not the essential smoothness of the gravitational metric is two full derivatives more regular than the Riemann curvature tensor. This provides a geometric framework for the open problem as to whether {\it regularity singularities} (points where the curvature is in $L^\infty$ but the essential smoothness of the gravitational metric is only Lipschitz continuous) can be created by shock wave interaction in GR, or whether metrics Lipschitz at shocks can always be smoothed one level to $C^{1,1}$ by coordinate transformation. As a corollary of the ideas we give a proof that locally inertial frames always exist in a natural sense for shock wave metrics in spherically symmetric spacetimes, independent of whether the metric itself can be smoothed to $C^{1,1}$ locally. This latter result yields an explicit procedure (analogous to Riemann Normal Coordinates in smooth spacetimes) for constructing locally inertial coordinates for Lipschitz metrics, and is a new regularity result for GR solutions constructed by the Glimm scheme.
description: V5: Improved presentation, in particular, to Section 6. Results unchanged. V4: We shortened the presentation, added Def 3.1 and removed last section of previous version. V3: We extended results from connections of bounded variation to connections bounded in $L^\infty$, otherwise main results remain identical. V2: Result of Theorem 1.5 was extended from 2-D to spherically symmetric space-times
Caracterización de la gestión del recurso humano en la pequeña y mediana empresa. 2000 - 2001, el caso de las que sobrevivieron
Creators: name: León Baños, Lewis Alexandra
Publisher: name: Universidad de Cartagena
Year: 2001
Subjects: Pequeña y mediana empresa
Microempresas

description: Tesis (Trabajadora Social) -- Universidad de Cartagena. Facultad de Ciencias Sociales y Educación. Programa de Trabajo Social, 2001
description: Tipos de gestión de recursos humanos presentes en la PYME cartagenera, de acuerdo a los diferentes sectores que la comprenden, determinando resultados y efectos de los diferentes tipos de gestión desarrolladas.
Approaches towards drug detection using porous silicon-based mass spectrometry
Creators: name: MINHAS, RAJPREET SINGH
Publisher: name: Monash University
Year: 2021
Subjects: Pharmaceutical sciences
Toxicology (incl. clinical toxicology)

description: With the changing landscape of drug use, there is a continued major interest in the ability to accurately and sensitively detect such compounds directly from biological fluids in different contexts. This thesis aims to meet the challenges of drug detection using porous silicon-based laser desorption/ionisation mass spectrometry, an alternative analytical technique. The research performed in this thesis has transformed and progressed the analytical approach towards real world applications in the areas of drug detection and monitoring.
An improved effective-one-body model of spinning, nonprecessing binary black holes for the era of gravitational-wave astrophysics with advanced detectors
Creators: name: Bohé, Alejandro
name: Shao, Lijing
name: Taracchini, Andrea
name: Buonanno, Alessandra
name: Babak, Stanislav
name: Harry, Ian W.
name: Hinder, Ian
name: Ossokine, Serguei
name: Pürrer, Michael
name: Raymond, Vivien
name: Chu, Tony
name: Fong, Heather
name: Kumar, Prayush
name: Pfeiffer, Harald P.
name: Boyle, Michael
name: Hemberger, Daniel A.
name: Kidder, Lawrence E.
name: Lovelace, Geoffrey
name: Scheel, Mark A.
name: Szilágyi, Béla
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We improve the accuracy of the effective-one-body (EOB) waveforms that were employed during the first observing run of Advanced LIGO for binaries of spinning, nonprecessing black holes by calibrating them to a set of 141 numerical-relativity (NR) waveforms. The NR simulations expand the domain of calibration towards larger mass ratios and spins, as compared to the previous EOBNR model. Merger-ringdown waveforms computed in black-hole perturbation theory for Kerr spins close to extremal provide additional inputs to the calibration. For the inspiral-plunge phase, we use a Markov-chain Monte Carlo algorithm to efficiently explore the calibration space. For the merger-ringdown phase, we fit the NR signals with phenomenological formulae. After extrapolation of the calibrated model to arbitrary mass ratios and spins, the (dominant-mode) EOBNR waveforms have faithfulness --- at design Advanced-LIGO sensitivity --- above $99\%$ against all the NR waveforms, including 16 additional waveforms used for validation, when maximizing only on initial phase and time. This implies a negligible loss in event rate due to modeling for these binary configurations. We find that future NR simulations at mass ratios $\gtrsim 4$ and double spin $\gtrsim 0.8$ will be crucial to resolve discrepancies between different ways of extrapolating waveform models. We also find that some of the NR simulations that already exist in such region of parameter space are too short to constrain the low-frequency portion of the models. Finally, we build a reduced-order version of the EOBNR model to speed up waveform generation by orders of magnitude, thus enabling intensive data-analysis applications during the upcoming observation runs of Advanced LIGO.
description: 27 pages, 15 figures
Wave Packet Dynamics in a Quasi-One-Dimensional Metal-Halogen Complex Studied by Ultrafast Time-Resolved Spectroscopy
Creators: name: Kano, H.
name: Kobayashi, T.
name: Saito, T.
name: Sugita, A.
name: Yamashita, M.
Publisher: name: The American Physical Society
Year: 2001
Subjects: subject: 530

description: Physical Review Letters
Posterior sampling for inverse imaging problems on the sphere in seismology and cosmology
Creators: name: Marignier, Augustin
name: McEwen, Jason D.
name: Ferreira, Ana M. G.
name: Kitching, Thomas D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Inverse problems defined on the sphere arise in many fields, including seismology and cosmology where problems are defined on the globe and the cosmic sphere. These are generally high-dimensional and computationally very complex and, as a result, sampling the posterior of spherical inverse problems is a challenging task. In this work, we describe a framework that leverages a proximal Markov chain Monte Carlo (MCMC) algorithm to efficiently sample the high-dimensional space of spherical inverse problems with a sparsity-promoting wavelet prior. We detail the modifications needed for the algorithm to be applied to spherical problems, and give special consideration to the crucial forward modelling step which contains spherical harmonic transforms that are computationally expensive. By sampling the posterior, our framework allows for full and flexible uncertainty quantification, something which is not possible with other methods based on, for example, convex optimisation. We demonstrate our framework in practice on full-sky cosmological mass-mapping and on a common problem in global seismic tomography. We find that our approach is potentially useful at moderate resolutions, such as those of interest in seismology. Our framework is generally limited by resolution requirements, such as those required for astrophysical applications, due to the poor scaling of the complexity of spherical harmonic transforms with resolution. A new Python package, pxmcmc, containing the proximal MCMC sampler, measurement operators, wavelet transforms and sparse priors is made publicly available.
Proyecto formación de gestores sociales garantes de los derechos de los niños y las niñas en doce comunidades del distrito de Cartagena 2006 - 2009. Informe de gestión zona 3: Membrillal, Nelson Mandela, Comuna 15 y Libertadores
Creators: name: Peña Bastidas, Ericka Patricia
Publisher: name: Universidad de Cartagena
Year: 2008
Subjects: subject: Trabajo social con niños
subject: Asistencia social a los niños

description: Este trabajo pretender dar cuenta de los resultados del proceso en las comunidades de Libertador, Membrillal, comuna 15 y Nelson Mandela. De esta forma, las instituciones que lideran el proyecto podrán tener una mirada integral del proceso y hacer los ajustes necesarios al mismo, teniendo en cuenta que el objetivo principal del informe de gestión es dar cuenta de los elementos más significativos del proceso adelantado durante la práctica. En el marco del convenio entre la Universidad de Cartagena con el Plan Internacional han desarrollado una propuesta denominada formación de gestores sociales garantes de los derechos de los niños y niñas en doce comunidades de Cartagena, con el fin de a partir de un proceso de formación de un grupo de líderes mejorar las condiciones de los niños y niñas en las familias y las comunidades.
Singularity categories of deformations of Kleinian singularities
Creators: name: Crawford, Simon
Publisher: name: arXiv
Year: 2016
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 14J17, 16G20 (Primary), 16G50, 18E30 (Secondary)

description: Let $G$ be a finite subgroup of $\text{SL}(2,\Bbbk)$ and let $R = \Bbbk[x,y]^G$ be the coordinate ring of the corresponding Kleinian singularity. In 1998, Crawley-Boevey and Holland defined deformations $\mathcal{O}^λ$ of $R$ parametrised by weights $λ$. In this paper, we determine the singularity categories $\mathcal{D}_{\text{sg}}(\mathcal{O}^λ)$ of these deformations, and show that they correspond to subgraphs of the Dynkin graph associated to $R$. This generalises known results on the structure of $\mathcal{D}_{\text{sg}}(R)$. We also provide a generalisation of the intersection theory appearing in the geometric McKay correspondence to a noncommutative setting.
description: Substantial revision to the previous version, which uses a shorter argument to prove the main theorem. To appear in Algebra & Number Theory
Local Well-posedness of the Free-Boundary Problem in Compressible Resistive Magnetohydrodynamics
Creators: name: Zhang, Junyan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We prove the local well-posedness in Sobolev spaces of the free-boundary problem for compressible inviscid resistive isentropic MHD system under the Rayleigh-Taylor physical sign condition, which describes the motion of a free-boundary compressible plasma in an electro-magnetic field with magnetic diffusion. We use Lagrangian coordinates and apply the tangential smoothing method introduced by Coutand-Shkoller to construct the approximation solutions. One of the key observations is that the Christodoulou-Lindblad type elliptic estimate together with magnetic diffusion not only gives the common control of magnetic field and fluid pressure directly, but also controls the Lorentz force which is a higher order term in the energy functional.
description: 51 pages. Typos corrected. Final version, accepted by CVPDE
The Effect Of Reward On Employee Performance: The Case Of Commercial Bank Of Ethiopia (CBE)
Creators: name: Seleshi, Dereje
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2017

description: Reward system is one of the most essential tools in a company's development and success. In order to maximize the overall performance of the company, it is vital for an employer to understand how employees perceived the reward system, and motivated by the rewards given by the company.The main objective this study was to investigate the effects of reward on employee performance at commercial bank of Ethiopia. Data were collected through questionnaire prepared based on previous scholars work.Content of the reward and employee performance of questionnaire was adopted for use developed by (La Belle, 2005).). A stratified random sampling technique was used to select a sample of 363 respondents from a target population of 6296employees with a response rate of 81%. The study adopted descriptive and explanatory research design. Data analysis was carried out using quantitative techniques with the aid of SPSS version 20.The data was analyzed mainly by using descriptive statistics, correlation and regression analysis.The results revealed that there is positive and significant relationship between Reward and employee performances. However, based on the finding Intrinsic Reward factors have more influence toward employees' performance than Extrinsic Reward factors.This study has provided implications that extrinsic rewards are to some extent need improvement and employees are nowadays searching for rewards beyond solely monetary rewards. Therefore, in order to be effective in achieving its targeted goals and objectives, CBE is required to reevaluate its reward practices
Incidencia de la política fiscal sobre el indice de desarrollo humano en Colombia
Creators: name: Lengua Calvo, Karina Yojana
name: López Espitia, Diva Luz
Publisher: name: Universidad de Cartagena
Year: 2017
Subjects: Gastos públicos
Política fiscal
Desarrollo humano

description: Tesis (Economista).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Economía, 2017
description: El presente estudio tiene por objeto examinar el comportamiento del índice de desarrollo humano en Colombia durante el período 1990-2014 y estudiar la relación entre el gasto público como herramienta de Política Fiscal y el Desarrollo humano durante este período.
Anomalous Transport in the Superfluid Fluctuation Regime
Creators: name: Uchino, Shun
name: Ueda, Masahito
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Motivated by a recent experiment in ultracold atoms [ S. Krinner et al., Proc. Natl. Acad. Sci. U.S.A 113, 8144 (2016)], we analyze transport of attractively interacting fermions through a one-dimensional wire near the superfluid transition. We show that in a ballistic regime where the conductance is quantized in the absence of interaction, the conductance is renormalized by superfluid fluctuations in reservoirs. In particular, the particle conductance is strongly enhanced and the plateau is blurred by emergent bosonic pair transport. For spin transport, in addition to the contact resistance the wire itself is resistive, leading to a suppression of the measured spin conductance. Our results are qualitatively consistent with the experimental observations.
description: 5 pages, 3 figures
Engineering interfacial quantum states and electronic landscapes by molecular nanoarchitectures
Creators: name: Piquero-Zulaica, Ignacio
name: Lobo-Checa, Jorge
name: El-Fattah, Zakaria M. Abd
name: Ortega, J. Enrique
name: Klappenberger, Florian
name: Auwärter, Willi
name: Barth, Johannes V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Surfaces are at the frontier of every known solid. They provide versatile supports for functional nanostructures and mediate essential physicochemical processes. Being intimately related with 2D materials, interfaces and atomically thin films often feature distinct electronic states with respect to the bulk, which are key for many relevant properties, such as catalytic activity, interfacial charge-transfer, or crystal growth mechanisms. Of particular interest is reducing the surface electrons' dimensionality and spread with atomic precision, to induce novel quantum properties via lateral scattering and confinement. Both atomic manipulation and supramolecular principles provide access to custom-designed molecular superlattices, which tailor the surface electronic landscape and influence fundamental chemical and physical properties at the nanoscale. Herein, we review the confinement of surface state electrons focusing on their interaction with molecule-based scaffolds created by molecular manipulation and self-assembly protocols under ultrahigh vacuum conditions. Starting from the quasi-free 2D electron gas present at the (111)-terminated surface planes of noble metals, we illustrate the enhanced molecule-based structural complexity and versatility compared to simple atoms. We survey low-dimensional confining structures in the form of artificial lattices, molecular nanogratings or quantum dot arrays, which are constructed upon appropriate choice of their building constituents. Whenever the realized (metal-)organic networks exhibit long-range order, modified surface band structures with characteristic features emerge, revealing intriguing physical properties, such as discretization, quantum coupling or energy and effective mass renormalization. Such collective electronic states can be additionally modified by positioning guest species at the voids of open nanoarchitectures [...].
description: Review with 31 pages and 28 Figures
Propuesta de un modelo de dirección estratégica en la empresa O.I.F.C. S.A.S De Cartagena
Creators: name: Dunoyer Olave, María José
name: Rincón Orozco, Lucelis Adriana
Publisher: name: Universidad de Cartagena
Year: 2014
Subjects: Planeación estratégica
Dirección estratégica

description: Tesis (Administrador de Empresas).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración de Empresas, 2014
description: El objetivo de este trabajo de grado es diseñar un modelo de dirección estratégica en la empresa O.I.F.C. S.A.S. de Cartagena por medio de la aplicación de conocimiento, teorías y estrategias, para llevar a cabo la propuesta de un programa de mejoramiento de la productividad y competitividad de la empresa.
The development of 53BP1 inhibitors using REFiL– an efficient workflow for early stage hit to lead optimisation in FBDD
Creators: name: CHIEW, BEATRICE
Publisher: name: Monash University
Year: 2021
Subjects: Organic chemical synthesis
Biochemistry and cell biology not elsewhere classified
Organic chemistry not elsewhere classified
Human biophysics
Medicinal and biomolecular chemistry not elsewhere classified

description: Breast cancer is a commonly diagnosed form of cancer. A person is 6-times more likely to develop breast cancer if they have inherited mutations to the BRCA-1 gene. One potential means of preventing this is by inhibiting a protein called 53BP1. This work details the synthesis and testing of over 1000 potential drug-like compounds against 53BP1. It also demonstrates one of the first applications of a novel workflow hoped to expedite drug discovery called REFiL – the Rapid Elaboration of Fragments into Leads. In under 3 years, 7 promising leads were identified against this potential new anti-cancer target.