1,145 research outputs found
Measurement of sigma (pp -> bbX) at √s=7 TeV in the forward region
No full textDecays of b hadrons into final states containing a D-0 meson and a muon are used to measure the bb; production cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV at the LHC. In the pseudorapidity interval 2 < eta < 6 and integrated over all transverse momenta we find that the average cross-section to produce b-flavoured or b-flavoured hadrons is (75.3 +/- 5.4 +/- 13.0) mu b
First observation of Bs0 → D*s2+Xμ-ν decays
No full textUsing data collected with the LHCb detector in proton–proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays B0s→D+sXμ−ν and B0s→D0K+Xμ−ν are detected. Two structures are observed in the D0K+ mass spectrum at masses consistent with the known Ds1(2536)+ and D∗s22573)+ mesons. The measured branching fractions relative to the total B0s semileptonic rate are B(B0s→D∗+s2Xμ−ν)/B(B0s→Xμ−ν) = (3.3±1.0±0.4)%, and B(B0s→D+s1Xμ−ν)/B(B0s→Xμ−ν) = (5.4±1.2±0.5)%, where the first uncertainty is statistical and the second is systematic. This is the first observation of the D∗+s2 state in B0s decays; we also measure its mass and width
Illumination control of an LED lighting system based on localized occupancy
No full textLight emitting diode (LED) based systems are considered to be the future of lighting. We consider the problem of energy-efficient illumination control of such systems. Energy-efficient system design is based on two aspects: localized information of occupancy and optimization of dimming levels of the LEDs. Specifically, we are interested in minimizing the power consumption of an LED system, subject to providing uniform illumination at a pre-specified level around occupied zones, by determining the dimming levels of the LEDs. Localized occupancy information (i.e. occupied zones) is determined by an ultrasonic array sensor while providing a natural interface for illumination control. We present algorithms for localizing and tracking an occupant in an indoor environment. We show that the optimization problem for illumination can be solved by linear programming and use the simplex algorithm to determine the dimming levels. The efficacy of the system is evaluated with numerical simulations and experimental data.TelecommunicationsElectrical Engineering, Mathematics and Computer Scienc
First observation of the decay Bs0→K*0K*0
No full textThe first observation of the decay B0s→K∗0K∗0 is reported using 35 pb−1 of data collected by LHCb in proton–proton collisions at a centre-of-mass energy of 7 TeV. A total of 49.8±7.5 B0s→(K+π−)(K−π+) events are observed within ±50 MeV/c2 of the B0s mass and 746 MeV/c2 < mKπ < 1046 MeV/c2, mostly coming from a resonant B0s→K∗0K∗0 signal. The branching fraction and the CP-averaged K∗0 longitudinal polarization fraction are measured to be B(B0s→K∗0K∗0)=(2.81±0.46(stat.)±0.45(syst.)±0.34(fs/ fd))×10−5 and fL =0.31±0.12(stat.)±0.04(syst.)
The role of women in environmental conservation and the transmission of knowledge: a case study in the neighborhood of Egypt in the town of Candelaria, Bogotá D.C.
No full textEl presente proyecto se realiza con el fin de poder describir el rol de la mujer en la conservación ambiental y la transmisión de conocimientos, esto mediante un estudio de caso en el barrio Egipto con un grupo de mujeres de la tercera edad, bajo los supuestos de una investigación cualitativa con el uso de recursos como el grupo focal, la cartografía social y entrevistas semiestructuradas.
ENG This project is carried out in order to describe the role of women in environmental conservation and the transmission of knowledge, this through a case study in the neighborhood of Egypt with a group of elderly women, under the assumptions of a qualitative research with the use of resources such as the focus group, social cartography and semi-structured interviews.1. Título de la investigación
2. Problema de investigación
2.1 descripción del problema
2.2 formulación del problema
3. Objetivos de la investigación
3.1 objetivo general
3.2 objetivos específicos
4. Justificación y delimitación de la investigación
4.1. Justificación
4.2. Delimitación
5. Marco de referencia de la investigación
5.1. Marco teórico
5.2. Marco conceptual
5.3. Marco legal
5.4. Marco histórico
6. Tipo de investigación
7. Diseño metodológico
8. Fuentes para la obtención de información
8.1 fuentes primarias
8.2 fuentes secundarias
9. Recursos
10. Cronograma
11. Resultados y discusión
12. Conclusiones
13. Referencias.PregradoIngeniero en AmbientalIngeniería Ambienta
Measurement of the inclusive φ cross-section in pp collisions at √s=7 TeV
No full textThe cross-section for inclusive φ meson production in pp collisions at a centre-of-mass energy of √s = 7 TeV has been measured with the LHCb detector at the Large Hadron Collider. The differential cross-section is measured as a function of the φ transverse momentum pT and rapidity y in the region 0.6< pT <5.0 GeV/c and 2.44< y <4.06. The cross-section for inclusive φ production in this kinematic range is σ(pp→φX)=1758±19(stat) +43−14(syst)±182(scale) μb, where the first systematic uncertainty depends on the pT and y region and the second is related to the overall scale. Predictions based on the Pythia 6.4 generator underestimate the cross-section
Search for CP violation in D+->K-K+π+ decays
No full textA model-independent search for direct CP violation in the Cabibbo-suppressed decay D+→K-K+π+ in a sample of approximately 370 000 decays is carried out. The data were collected by the LHCb experiment in 2010 and correspond to an integrated luminosity of 35 pb-1. The normalized Dalitz plot distributions for D+ and D- are compared using four different binning schemes that are sensitive to different manifestations of CP violation. No evidence for CP asymmetry is found
Measurement of the effective B0s→K+K− lifetime
No full textA measurement of the effective lifetime is presented using approximately 37 pb−1 of data collected by LHCb during 2010. This quantity can be used to put constraints on contributions from processes beyond the Standard Model in the meson system and is determined by two complementary approaches as
τKK=1.440±0.096 (stat)±0.008 (syst)±0.003 (model) ps
Observation of J/ψ-pair production in pp collisions at √s=7 TeV
No full textThe production of J/ψ pairs in proton–proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of 37.5 pb−1 collected with the LHCb detector. The production cross-section for pairs with both J/ψ in the rapidity range 2 < yJ/ψ < 4.5 and transverse momentum pJ/ψ T <10 GeV/c is σJ/ψJ/ψ =5.1±1.0±1.1 nb, where the first uncertainty is statistical and the second systematic
The Game as a Playground Pedagogical Strategy for the Reading Comprehension of Third Grade Students
No full textDigitalEsta investigación se enmarca en las necesidades de formación en el nivel
educativo de básica primaria, respecto a las habilidades y competencias asociadas
a la lectura. La baja comprensión lectora observada en los estudiantes se ha
convertido en un grave problema para su proyección educativa.
El objetivo de la propuesta es analizar el proceso de comprensión lectora
implementando el juego, como herramienta motivadora, lúdico-pedagógica en los
estudiantes de grado tercero, incorporando estrategias didácticas y motivadoras
apoyadas en juegos digitales y no digitales, aplicadas en procesos pedagógicos,
como variables de interés.
Al desarrollar esta propuesta, se planteó una investigación de enfoque cualitativo y
diseño metodológico investigación-acción-participación, tomada de la metodología
de investigación y orientada a la práctica educativa.
La muestra corresponde a nueve estudiantes, quienes desarrollaron cuatro
actividades basadas en juegos no digitales y cuatro en juegos digitales, utilizando
la plataforma fundamerani.org, para aplicar el programa lectores competentes 2.0 y
la aplicación en línea wordwall, que permiten gamificar las actividades, mediante un
sistema de plantillas.
El resultado indica un mejoramiento en habilidades de comprensión lectora en un
100 % en el nivel literal, un 90 % en el nivel inferencial y para el nivel crítico los
resultados obtenidos no fueron representativos. Los estudiantes mejoraron la
habilidad de extraer información explícita e implícita, asumiendo una postura crítica
frente al texto y un alto grado de aceptación al desarrollar actividades de juegos
digitales, observándose una gran motivación (atención, relevancia, confianza y
satisfacción) al desarrollarlas; demostrando un aprendizaje significativo y gusto por
la lectura.This research is part of the training needs at the elementary school level, regarding the
skills and competencies associated with reading. The low reading comprehension
observed in students has become a serious problem for their educational projection.
The objective of the proposal is to analyze the reading comprehension process by
implementing the game, as a motivating, playful-pedagogical tool in third grade students,
incorporating didactic and motivational strategies supported by digital and non-digital
games, applied in pedagogical processes, as variable of interest.
When developing this proposal, an investigation with a qualitative approach and
research-action-participation methodological design was proposed, taken from the
research methodology and oriented to educational practice.
The sample corresponds to nine students, who developed four activities based on nondigital games and four on digital games, using the fundamerani.org platform, to apply
the 2.0 competent readers program and the wordwall online application, which allow
gamification of activities, through a template system.
The result indicates an improvement in reading comprehension skills by 100% at the
literal level, 90% at the inferential level and for the critical level the results obtained were
not representative. The students improved the ability to extract explicit and implicit
information, assuming a critical stance in front of the text and a high degree of
acceptance when developing digital game activities, observing a great motivation
(attention, relevance, trust and satisfaction) when developing them; demonstrating
significant learning and a taste for reading.INTRODUCCIÓN ……………………………………………………………………… 18
1. PRESENTACIÓN DEL TRABAJO DE GRADO ………………………………. 20
1.1 PLANTEAMIENTO DEL PROBLEMA ............................................................20
1.2 ALCANCE ........................................................................................................27
1.3 JUSTIFICACIÓN..............................................................................................27
1.4 OBJETIVOS .....................................................................................................30
1.4.1 Objetivo general ……………………………………………………………….. 30
1.4.2 Objetivos específicos ………………………………………………………….. 30
2. BASES TEÓRICAS ……………………………………………………………….. 31
2.1. ESTADO DEL ARTE ………………………………………………………..….. 31
2.2. MARCO REFERENCIAL ………………………………………………………. 35
2.2.1. Marco Teórico ………………………………………………………………. 35
2.2.2. Marco Conceptual …………………………………………………………… 50
2.2.3. Marco Legal …………………………………………………………………. 54
3. DISEÑO METODOLÓGICO ……………………………………………………. 58
3.1. TIPO DE INVESTIGACIÓN …………………………………………………… 59
3.2. HIPÓTESIS ……………………………………………………………………… 60
3.3. CATEGORÍAS ………………………………………………………………….. 60
3.4. DESCRIPCIÓN DE LAS CATEGORÍAS …………………………………. 60
3.5. POBLACIÓN Y MUESTRA …………………………………………………… 62
3.5.1. Muestra ……………………………………………………………………… 63
3.6. PROCEDIMIENTO …………………………………………………………….. 63
3.7. INSTRUMENTOS DE RECOLECCIÓN DE INFORMACIÓN ……………… 65
3.8. TÉCNICAS DE ANÁLISIS DE DATOS ………………………………………. 67
4. CONSIDERACIONES ÉTICAS ………………………………………………… 68
5. DIAGNÓSTICO INICIAL ………………………………………………………… 69
5.1. ANÁLISIS DE LA FLUIDEZ DE LECTURA – PRUEBA DIAGNÓSTICA .....70
5.2. ANÁLISIS PRUEBA DE COMPRENSIÓN LECTORA ..................................75
6. ESTRUCTURA DE LA PROPUESTA DE INVESTIGACIÓN ………………… 80
6.1. PROPUESTA PEDAGÓGICA.........................................................................80
6.2. COMPONENTE TECNOLÓGICO ..................................................................99
6.3. IMPLEMENTACIÓN ......................................................................................105
7. ANÁLISIS E INTERPRETACIÓN DE DATOS ………………………………. 119
8. CONCLUSIONES ………………………………………………………………. 133
9. LIMITACIONES ………………………………………………………………… 136
10. IMPACTO, RECOMENDACIONES Y TRABAJOS FUTUROS ……………. 137
BIBLIOGRAFÍA ………………………………………………………………………. 140MaestríaMagíster en Tecnologías Digitales Aplicadas a la Educació
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