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Mostrando documentos 199-218 de 69531
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A calibration function from change points using linear mixed models
The change point problem is an interesting topic in both cross-sectional and longitudinal settings. In the cross-sectional scenario, the change point problem has been studied extensively. In longitudinal settings, authors ...Universidad Nacional de Colombia Sede Medellín Facultad de Ciencias Escuela de Estadística Estadística. -
A caminho de uma memorizaçao dos sinais dos impactos cruzados entre variaveis estrategicas
Á expressao "tudo o mais constante" [do latim "ceteris paribus"), apreciada pelos economistas, os segidores de prospectiva opoem a expressao "tudo o mais esta mudando”. Razao pela qual tem sido desenvolvidas ferramentas, ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Innovar Journal Revista de Ciencias Administrativas y Sociales. -
A case study of the learning styles in low-level learners in a private school in bogotá
This paper aims to report on a study carried out with eighth graders at a private school in Bogotá. The main focus of the research was to determine the learning styles characterizing lowachievement students when learning ...Universidad Nacional de Colombia Revistas electrónicas UN PROFILE Issues in Teachers' Professional Development. -
A CFD based approach for determination of ammonia concentration profile and flux from poultry houses with natural ventilation
The understanding of concentration and emissions distribution of gases such as ammonia (NH3) in agricultural installations is of growing importance due to its effect on health and productivity of animals and workers. The ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Facultad Nacional de Agronomía Medellín. -
A characterization of height-based extensions of principal filtral opportunity rankings
A parameterized characterization of height-based total extensions of principal filtral opportunity rankings is provided and shown to include, as a special case, a version of the well-known Pattanaik-Xu characterization of ...Universidad Nacional de Colombia Revistas electrónicas UN Cuadernos de Economía. -
A characterization of primal noetherian rings
Noetherian ring with identity is shown to be a primal ring if and only if the prime ideals are totally ordered by inclusion.Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Matemáticas. -
A characterization of structural nikol'skiî- besov spaces using fractional derivatives
The Nikol'skiî-Besov spaces Bapq(Rn), 1 0, are defined in terms of modulus of continuity and they are characterized using the partial derivatives of the Poisson integrals. In this work we show a characterizationof the ...Universidad Nacional de Colombia Revistas electrónicas UN Boletín de Matemáticas. -
A check - list of colombian and presumed colombian cactaceae
This check-list has strictly practical purposes. It was written to present in a convenient form a selection of published species, which all students of Colombian Cactaceae cannot afford to disregard while identifying old ...Universidad Nacional de Colombia Revistas electrónicas UN Caldasia. -
A checklist of the ants (hymenoptera: formicidae) of the department of antioquia, colombia and new records for the country
Antioquia is a state (department) of Colombia, located in thenorthwestern Andes of South America. Geologically, the northwesternregion of the Western Range in Antioquia and Chocóincludes the fault resulting from the ...Universidad Nacional de Colombia Revistas electrónicas UN Agronomía Colombiana. -
A checklist to define the psychological processes/una lista de control para definir los procesos psicológicos
This essay explores a conceptual definition of psychological processes. Previous researchers from the fields of psychology and neuroscience have noted that improving the definition of psychological processes may be extremely ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Psicología. -
A cien años de la muerte de león walras i: sobre su obra original
Este artículo es un viaje personal a través de la obra original de León Walras en el centenario de su muerte (1910). Se enfatiza en su modelo de equilibrio general bajo competencia perfecta, pero enmarcado por los criterios ...Universidad Nacional de Colombia Revistas electrónicas UN Cuadernos de Economía. -
A cien años de la muerte de león walras ii: huellas de la tradición paretiana
En el aniversario de su muerte, este segundo artículo describe algunas de las huellas de la tradición paretiana a partir del trabajo original de Léon Walras, desde los lineamientos fundamentales de Vilfredo Pareto, hasta ...Universidad Nacional de Colombia Revistas electrónicas UN Ensayos de Economía. -
A CMOS Micro-power, Class-AB “Flipped” Voltage Follower using the quasi floating-gate technique
This paper presents the design and characterization of a new analog voltage follower for low-voltage applications. The main idea is based on the “Flipped” Voltage Follower and the use of the quasi-floating gate technique ...Universidad Nacional de Colombia Revistas electrónicas UN Ingeniería e Investigación. -
A co-occurrence region based Bayesian network stepwise remote sensing image retrieval algorithm
Although scholars have conducted numerous researches on content-based image retrieval and obtained great achievements, they make little progress in studying remote sensing image retrieval. Both theoretical and application ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
A coating of chitosan and propolis extract for the postharvest treatment of papaya (Carica papaya L. cv. Hawaiiana)
Propolis is a natural antimicrobial that can be used asa bioadditive in coatings to control fruit quality losses. The effectof two coatings was evaluated, a control (chitosan, 1%) and atreatment (chitosan, 1%; containing ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Facultad Nacional de Agronomía Medellín. -
A college degree recommendation model
Selecting a profession suitable to students` expectations implies taking into account multiple factors. Despite its usefulness and high impact, there are shortcomings in current university major recommendation models. Among ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
A comment about estimable functions in linear models with non estimable constraints
In the Searle's (1987) book, Linear Models for Unbalanced Data, a characterization of the estimable functions in linear models with non estimable constraints is presented. In this informal paper, I indicate another ...Universidad Nacional de Colombia Revistas electrónicas UN Revista Colombiana de Estadística. -
A comparative analysis on the seismic behavior of buildings using inerter-based devices: Tuned Mass Damper Inerter (TMDI) and Tuned Inerter Damper (TID)
To accomplish an appropriate performance of tuned mass dampers (TMDs) in building structures subjected to earthquake excitations, considerable amounts of mass must be added at upper floors, which in occasions may result ... -
A comparative case study of the pre and post operative stress distribution in a dysplastic hip joint
This investigation aims to obtain and compare the stress distribution on a dysplastic residual hip joint on two scenarios: standing on two legs and single leg standing, before and after surgery, using finite elements ...Universidad Nacional de Colombia Sede Bogotá Facultad de Ingeniería Departamento de Ingeniería Mecánica y Mecatrónica Ingeniería Mecatrónica. -
A comparative study for the design of rectangular and circular isolated footings using new models
This paper presents a comparative study for design of reinforced concrete isolated footings of rectangular and circular form subjected to axial load and bending moments in two directions using new modelsto obtain the most ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna.
