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Sample records for empleando logica difusa

  1. The Comptel project and Logica's involvement

    NASA Astrophysics Data System (ADS)

    McCormack, A.; Bains, N.; Jenkins, C.; Hall, R.; Jeanes, A.

    1991-01-01

    The scientific objectives of the application software development of the Compton Imaging Telescope (Comptel) project is described and Logica's specific involvement is detailed with respect to scientific, technical, and managerial aspects. Comptel is one of four instruments onboard the Gamma Ray Observatory (GRO), a NASA project, to be launched in March 1991. It will study gamma ray characteristics of point sources, diffuse emission from the galaxy, cosmic diffusion flux and broadened line emissions. It will also determine the direction of arrival as well as the energy of gamma ray photons from 1 to 30 MeV. Logica has played an active part in the writing of software requirements for the subsystems of GRO and subsequently the detailed design, code, test, and integration of these subsystems. Logica's roles include the development of a module calibration subsystem which includes the development of gamma ray burst software and pulsar analysis software both of which are discussed in detail.

  2. Logica's one-way VSAT system

    NASA Astrophysics Data System (ADS)

    Barrington-Cook, J. I.

    1991-01-01

    Logica has recently produced the main 'collection and forwarding' element for a comprehensive one-way VSAT system. The system is designed to utilize the extra bandwidth available from direct-to-home broadcasts using the MAC/packet television standard, in order to provide point-to-multipoint data transmission via satellite. The expectation of very large volumes of supply for standard decoders, together with the large amount of bandwidth available, suggest that extremely low cost data transmission may become available. The system is designed to provide the necessary infrastructure to allow this bulk data, low cost approach to be offered for small scale and ad-hoc data transmission.

  3. Model-Based Teaching and Learning with BioLogica[TM]: What Do They Learn? How Do They Learn? How Do We Know?

    ERIC Educational Resources Information Center

    Buckley, Barbara C.; Gobert, Janice D.; Kindfield, Ann C. H.; Horwitz, Paul; Tinker, Robert F.; Gerlits, Bobbi; Wilensky, Uri; Dede, Chris; Willett, John

    2004-01-01

    This paper describes part of a project called Modeling Across the Curriculum which is a large-scale research study in 15 schools across the United States. The specific data presented and discussed here in this paper is based on BioLogica, a hypermodel, interactive environment for learning genetics, which was implemented in multiple classes in…

  4. Estudio de la estructura logica utilizada en la ensenanza y el aprendizaje de los conceptos sobre el comportamiento de gases en el curso introductorio de quimica a nivel universitario

    NASA Astrophysics Data System (ADS)

    Costa Diaz, Agnes

    El estudio que se presenta es de caracter cualitativo, un estudio multicasos donde se estudia la estructura logica utilizada por cuatro (4) profesores universitarios que ensenan el curso introductorio de quimica, en la planificacion, presentacion y evaluacion del tema sobre el comportamiento de los gases. Se utilizaron varias fuentes de informacion como: cuestionarios de profesores y estudiantes, entrevistas, grabaciones videomagnetofonicas, materiales didacticos y una prueba conceptual, entre otros. La informacion recopilada fue analizada de acuerdo al orden logico del contenido presentado, el estilo de ensenanza del profesor, las tecnicas y estrategias utilizadas para el desarrollo de destrezas de pensamiento, el ambiente fisico en el salon de clase y los instrumentos de evaluacion y avaluo. El estudio demuestra que lo que los profesores piensan y planifican para hacer sus presentaciones no necesariamente es lo que ocurre en el salon de clases. El desarrollo de destrezas de pensamiento, que constituye una prioridad de los profesores, no se elaboran efectivamente. El uso de las estrategias de resolucion de problemas numericos predomino. La participacion del estudiante en el salon de clases fue limitada y no se logro demostrar el desarrollo de las destrezas de pensamiento deseadas. Aunque los profesores tienen su propio estilo de ensenanza, el orden logico del contenido presentado en clase fue el mismo o siguio muy de cerca el orden establecido por el libro de texto. Los profesores utilizaron preferentemente la tiza y la pizarra para sus presentaciones y la dinamica en el salon de clases fue esencialmente tradicional. Los profesores hicieron su presentacion y los estudiantes copiaron pasivamente la informacion. Las evaluaciones de los estudiantes fueron esencialmente, pruebas escritas de seleccion multiple de acuerdo con el estilo en que se les enseno. El avaluo fue casi inexistente. La prueba conceptual administrada revela un aprendizaje pobre en los conceptos mas

  5. VLSI implementations of threshold logic-a comprehensive survey.

    PubMed

    Beiu, V; Quintana, J M; Avedillo, M J

    2003-01-01

    This paper is an in-depth review on silicon implementations of threshold logic gates that covers several decades. In this paper, we will mention early MOS threshold logic solutions and detail numerous very-large-scale integration (VLSI) implementations including capacitive (switched capacitor and floating gate with their variations), conductance/current (pseudo-nMOS and output-wired-inverters, including a plethora of solutions evolved from them), as well as many differential solutions. At the end, we will briefly mention other implementations, e.g., based on negative resistance devices and on single electron technologies. PMID:18244573

  6. Genetics Reasoning with Multiple External Representations.

    ERIC Educational Resources Information Center

    Tsui, Chi-Yan; Treagust, David F.

    2003-01-01

    Explores a case study of a class of 10th grade students whose learning of genetics involved activities using BioLogica, a computer program that features multiple external representations (MERs). Findings indicate that the MERs in BioLogica contributed to students' development of genetics reasoning by engendering their motivation and interest but…

  7. VISIÓN GENERAL DE LA EVALUACIÓN DEL RIESGO EN SALUD INFANTIL EMPLEANDO UN ENFOQUE POR ETAPAS DE DESARROLLO (American translation is: Overview of a Life Stage Approach to Children's Health Risk Assessment)

    EPA Science Inventory

    Discussing the challenges associated with estimating and interpreting toxicant exposures and health risks from biomonitoring data. This extended abstract was translated in Spanish and published in Acta Toxicologica Argentina.

  8. Learning Genetics with Computer Dragons

    ERIC Educational Resources Information Center

    Tsui, Chi-Yan; Treagust, David

    2003-01-01

    Over the past decades, genetics has remained a difficult topic in school science. This paper presents an interactive multimedia program, "BioLogica", used to teach Grade 10 (14- and 15-year-olds) Australian students about genetics. Over six weeks, the teacher used different representations in the teaching and engaged students in computer…

  9. Information Computer Communications Policy, 2: The Usage of International Data Networks in Europe.

    ERIC Educational Resources Information Center

    Organisation for Economic Cooperation and Development, Paris (France).

    This study of the development of international data networks, a phenomena of the 1970's, and policy issues arising from their use is an in depth investigation of 24 private and six public European networks commissioned from Logica Limited and sponsored by the governments of France, Germany, the Netherlands, Norway, Spain, and Sweden. The report…

  10. Motivational Aspects of Learning Genetics with Interactive Multimedia

    ERIC Educational Resources Information Center

    Tsui, Chi-Yan; Treagust, David F.

    2004-01-01

    A BioLogica trial in six U.S. schools using interpretive approach is conducted by the Concord Consortium that examined the student motivation of learning genetics. Multiple data sources like online tests, computer data log files and classroom observation are used that found the result in terms of interviewees' perception, class-wide online…

  11. Cycles of Exploration, Reflection, and Consolidation in Model-Based Learning of Genetics

    ERIC Educational Resources Information Center

    Kim, Beaumie; Pathak, Suneeta A.; Jacobson, Michael J.; Zhang, Baohui; Gobert, Janice D.

    2015-01-01

    Model-based reasoning has been introduced as an authentic way of learning science, and many researchers have developed technological tools for learning with models. This paper describes how a model-based tool, "BioLogica"™, was used to facilitate genetics learning in secondary 3-level biology in Singapore. The research team co-designed…

  12. A New Intelligent Tutoring System

    ERIC Educational Resources Information Center

    Ford, Lindsey

    2008-01-01

    Early in 1984, Logica started an ICAI research contract with MoD (Procurement Executive), which was to be undertaken in collaboration with the technical authority at the Royal Signals and Radar Establishment, Malvern. A prototype system, which has become known as TUTOR, was scheduled for delivery to the client later in 1985. Initially, and for…

  13. Study of Reed-Solomon correction for mass memory

    NASA Astrophysics Data System (ADS)

    Newman, B.; Hutton, S. J.

    1992-03-01

    Logica has performed a study of Reed-Solomon coding in the context of protecting a mass memory in the harsh space environment, e.g., against galactic cosmic rays and heavy ion rich solar flares. The study examined the relation between the final bit error rate, the rate at which the code is used to scrub errors from the memory, and the rate at which errors occur. The RS(255,252) code was considered.

  14. Cycles of Exploration, Reflection, and Consolidation in Model-Based Learning of Genetics

    NASA Astrophysics Data System (ADS)

    Kim, Beaumie; Pathak, Suneeta A.; Jacobson, Michael J.; Zhang, Baohui; Gobert, Janice D.

    2015-12-01

    Model-based reasoning has been introduced as an authentic way of learning science, and many researchers have developed technological tools for learning with models. This paper describes how a model-based tool, BioLogica™, was used to facilitate genetics learning in secondary 3-level biology in Singapore. The research team co-designed two different pedagogical approaches with teachers, both of which involved learner-centered "exploration and reflection" with BioLogica and teacher-led "telling" or "consolidation." One group went through the stand-alone BioLogica units for all topics prior to a series of teacher-led instructions, whereas the other group was engaged in teacher-led activities after using BioLogica for each topic. Based on the results of a series of tests on genetics, the groups performed differently from what the teacher had expected. We explore how the design of the two approaches and interactions among students might have contributed to the results.

  15. The Beagle 2 entry descent and landing system (EDLS) software - development and re-use of software for the Red Planet

    NASA Astrophysics Data System (ADS)

    Symonds, Martin

    2002-07-01

    This paper provides a brief introduction to the Beagle 2 Mars probe and the associated mission, followed by a description of Logica's software responsibility on this programme. The approach taken during software development and implementation of the missioncritical entry, descent and landing system software is then described. This has focussed on maximising re-use of expertise from similar programmes such as Huygens and Rosetta. At the same time effort was devoted to ensure that re-use was enabled within the programme as well as opening up the possibility for re-use on subsequent missions. Finally, the lessons learned are highlighted and a number of conclusions are drawn.

  16. Patterns in Safety-Related Projects

    NASA Astrophysics Data System (ADS)

    Parsons, Mike; Hunter, Charles

    Within Logica UK, safety-related projects are run in a variety of ways depending on the constraints imposed and how the risks and mitigations are owned and handled. A total of eight different types of project development patterns have been identified and this paper discusses each type. A simple decision tool has been developed based on the patterns which is used as an aid in deciding how to bid a safety project, allowing tradeoffs between risk ownership, development methods and cost to be assessed.

  17. Far-Ultraviolet Absolute Flux of α Virginis

    NASA Astrophysics Data System (ADS)

    Morales, Carmen; Trapero, Joaquín; Gómez, José F.; Giménez, Álvaro; Orozco, Verónica; Bowyer, Stuart; Edelstein, Jerry; Korpela, Eric; Lampton, Michael; Cobb, Jeff

    2000-02-01

    We present the far-ultraviolet spectrum of α Virginis taken with Espectrógrafo Ultravioleta extremo para la Radiación Difusa (EURD) spectrograph on board MINISAT-01. The spectral range covered is from ~900 to 1080 Å with 5 Å spectral resolution. We have fitted Kurucz models to IUE spectra of α Vir and compared the extension of the model to our wavelengths with EURD data. This comparison shows that EURD fluxes are consistent with the prediction of the model within ~20%-30%, depending on the reddening assumed. EURD fluxes are consistent with Voyager observations but are ~60% higher than most previous rocket observations of α Vir. Based on the development and utilization of the Espectrógrafo Ultravioleta de Radiación Difusa, a collaboration of the Spanish Instituto Nacional de Técnica Aeroespacial and the Center for EUV Astrophysics, University of California, Berkeley.

  18. Facial recognition trial: biometric identification of non-compliant subjects using CCTV

    NASA Astrophysics Data System (ADS)

    Best, Tim

    2007-10-01

    LogicaCMG were provided with an opportunity to deploy a facial recognition system in a realistic scenario. 12 cameras were installed at an international airport covering all entrances to the immigration hall. The evaluation took place over several months with numerous adjustments to both the hardware (i.e. cameras, servers and capture cards) and software. The learning curve has been very steep but a stage has now been reached where both LogicaCMG and the client are confident that, subject to the right environmental conditions (lighting and camera location) an effective system can be defined with a high probability of successful detection of the target individual, with minimal false alarms. To the best of our knowledge, results with a >90% detection rate, of non-compliant subjects 'at range' has not been achieved anywhere else. This puts this location at the forefront of capability in this area. The results achieved demonstrate that, given optimised conditions, it is possible to achieve a long range biometric identification of a non compliant subject, with a high rate of success.

  19. Evidence against the Sciama Model of Radiative Decay of Massive Neutrinos

    NASA Astrophysics Data System (ADS)

    Bowyer, Stuart; Korpela, Eric J.; Edelstein, Jerry; Lampton, Michael; Morales, Carmen; Pérez-Mercader, Juan; Gómez, José F.; Trapero, Joaquín

    1999-11-01

    We report on spectral observations of the night sky in the band around 900 Å where the emission line in the Sciama model of radiatively decaying massive neutrinos would be present. The data were obtained with a high-resolution, high-sensitivity spectrometer flown on the Spanish satellite MINISAT. The observed emission is far less intense than that expected in the Sciama model. Based on the development and utilization of the Espectrógrafo Ultravioleta de Radiación Difusa, a collaboration of the Spanish Instituto Nacional de Tecnica Aeroespacial and the Center for EUV Astrophysics, University of California, Berkeley.

  20. [Measure in Arabic and Middle Age medicine].

    PubMed

    Angeletti, L R

    1995-01-01

    During the XIVth century to the qualitative knowledge is superimposed the concept of the importance of a quantitative evaluation of natural phenomena. The Arabic works on science, first translated in Latin by Adelard of Bath, and the recovery of classical culture into Western Europe are discussed by Grosseteste, R. Bacon and Ockham with a separation of religious truth from the scientific findings; Jean Buridan (Paris) applied this meaning to physics and Simone di Castello (Bologna) considered the necessity of the measure of elements, qualities and humours to explain and correct health and disease. So, the logica nova was acquired also by medicine, as demonstrated by the works of Anthony Ricart and by the direct quantitation made by Santorio Santorio (early XVIIth c.), who constructed appropriate instruments for measurement of medical parameters. PMID:11640512

  1. European Telecommunications Conference. Strategic Planning for the 1990s

    NASA Astrophysics Data System (ADS)

    Blackburn, J. F.

    1990-06-01

    The European Telecommunications Conference Strategic Planning for the 1990s provided information to delegates and their companies on strategic planning for the European market, particularly after the advent of the European Single Market at the end of 1992. The conference objective was to examine the impact of the initiatives of the European Commission (EC) and the changing attitudes to service provision by public and private sector organizations on industry and marketing. Organized by Blenheim Online and Logica, 40 delegates attended this conference, mainly from Europe, but with a few from the U.S. The papers were designed to illuminate such questions as emerging market sectors, impact of U.S telecommunications organizations in Europe, mergers and acquisition, standards, and value-added services.

  2. Project GlobWave

    NASA Astrophysics Data System (ADS)

    Busswell, Geoff; Ash, Ellis; Piolle, Jean-Francois; Poulter, David J. S.; Snaith, Helen; Collard, Fabrice; Sheera, Harjit; Pinnock, Simon

    2010-12-01

    The ESA GlobWave project is a three year initiative, funded by ESA and CNES, to service the needs of satellite wave product users across the globe. Led by Logica UK, with support from CLS, IFREMER, SatOC and NOCS, the project will provide free access to satellite wave data and products in a common format, both historical and in near real time, from various European and American SAR and altimeter missions. Building on the successes of similar projects for Sea Surface Temperature and ocean colour, the project aims to stimulate increased use and analysis of satellite wave products. In addition to common-format satellite data the project will provide comparisons with in situ measurements, interactive data analysis tools and a pilot spatial wave forecast verification scheme for operational forecast production centres. The project will begin operations in January 2010, with direction from regular structured user consultation.

  3. Deductive Coordination of Multiple Geospatial Knowledge Sources

    NASA Astrophysics Data System (ADS)

    Waldinger, R.; Reddy, M.; Culy, C.; Hobbs, J.; Jarvis, P.; Dungan, J. L.

    2002-12-01

    Deductive inference is applied to choreograph the cooperation of multiple knowledge sources to respond to geospatial queries. When no one source can provide an answer, the response may be deduced from pieces of the answer provided by many sources. Examples of sources include (1) The Alexandria Digital Library Gazetteer, a repository that gives the locations for almost six million place names, (2) The Cia World Factbook, an online almanac with basic information about more than 200 countries. (3) The SRI TerraVision 3D Terrain Visualization System, which displays a flight-simulator-like interactive display of geographic data held in a database, (4) The NASA GDACC WebGIS client for searching satellite and other geographic data available through OpenGIS Consortium (OGC) Web Map Servers, and (5) The Northern Arizona University Latitude/Longitude Distance Calculator. Queries are phrased in English and are translated into logical theorems by the Gemini Natural Language Parser. The theorems are proved by SNARK, a first-order-logic theorem prover, in the context of an axiomatic geospatial theory. The theory embodies a representational scheme that takes into account the fact that the same place may have many names, and the same name may refer to many places. SNARK has built-in procedures (RCC8 and the Allen calculus, respectively) for reasoning about spatial and temporal concepts. External knowledge sources may be consulted by SNARK as the proof is in progress, so that most knowledge need not be stored axiomatically. The Open Agent Architecture (OAA) facilitates communication between sources that may be implemented on different machines in different computer languages. An answer to the query, in the form of text or an image, is extracted from the proof. Currently, three-dimensional images are displayed by TerraVision but other displays are possible. The combined system is called Geo-Logica. Some example queries that can be handled by Geo-Logica include: (1) show the

  4. Far-Ultraviolet Spectra of B Stars near the Ecliptic

    NASA Astrophysics Data System (ADS)

    Morales, Carmen; Orozco, Verónica; Gómez, José F.; Trapero, Joaquín; Talavera, Antonio; Bowyer, Stuart; Edelstein, Jerry; Korpela, Eric; Lampton, Michael; Drake, Jeremy J.

    2001-05-01

    Spectra of B stars in the wavelength range of 911-1100 Å have been obtained with the Espectrógrafo Ultravioleta de Radiación Difusa (EURD) spectrograph on board the Spanish satellite MINISAT-01 with ~5 Å spectral resolution. International Ultraviolet Explorer (IUE) spectra of the same stars have been used to normalize Kurucz models to the distance, reddening, and spectral type of the corresponding star. The comparison of eight main-sequence stars studied in detail (α Vir, ɛ Tau, λ Tau, τ Tau, α Leo, ζ Lib, θ Oph, and σ Sgr) shows agreement with Kurucz models, but observed fluxes are 10%-40% higher than the models in most cases. The difference in flux between observations and models is higher in the wavelength range between Lyα and Lyβ. We suggest that Kurucz models underestimate the far-ultraviolet (FUV) flux of main-sequence B stars between these two Lyman lines. Computation of flux distributions of line-blanketed model atmospheres including non-LTE effects suggests that this flux underestimate could be due to departures from LTE, although other causes cannot be ruled out. We found that the common assumption of solar metallicity for young disk stars should be made with care, since small deviations can have a significant impact on FUV model fluxes. Two peculiar stars (ρ Leo and ɛ Aqr) and two emission-line stars (ɛ Cap and π Aqr) were also studied. Of these, only ɛ Aqr has a flux in agreement with the models. The rest have strong variability in the IUE range and/or uncertain reddening, which makes the comparison with models difficult. Based on the development and utilization of the Espectrógrafo Ultravioleta de Radiación Difusa, a collaboration of the Spanish Instituto Nacional de Técnica Aeroespacial and the Center for EUV Astrophysics, University of California, Berkeley.

  5. System Safety in an IT Service Organization

    NASA Astrophysics Data System (ADS)

    Parsons, Mike; Scutt, Simon

    Within Logica UK, over 30 IT service projects are considered safetyrelated. These include operational IT services for airports, railway infrastructure asset management, nationwide radiation monitoring and hospital medical records services. A recent internal audit examined the processes and documents used to manage system safety on these services and made a series of recommendations for improvement. This paper looks at the changes and the challenges to introducing them, especially where the service is provided by multiple units supporting both safety and non-safety related services from multiple locations around the world. The recommendations include improvements to service agreements, improved process definitions, routine safety assessment of changes, enhanced call logging, improved staff competency and training, and increased safety awareness. Progress is reported as of today, together with a road map for implementation of the improvements to the service safety management system. A proposal for service assurance levels (SALs) is discussed as a way forward to cover the wide variety of services and associated safety risks.

  6. The BGAN extension programme

    NASA Astrophysics Data System (ADS)

    Rivera, Juan J.; Trachtman, Eyal; Richharia, Madhavendra

    2005-11-01

    Mobile satellite telecommunications systems have undergone an enormous evolution in the last decades, with the interest in having advanced telecommunications services available on demand, anywhere and at any time, leading to incredible advances. The demand for braodband data is therefore rapidly gathering pace, but current solutions are finding it increasingly difficult to combine large bandwidth with ubiquitous coverage, reliability and portability. The BGAN (Broadband Global Area Network) system, designed to operate with the Inmarsat-4 satellites, provides breakthrough services that meet all of these requirements. It will enable broadband connection on the move, delivering all the key tools of the modern office. Recognising the great impact that Inmarsat's BGAN system will have on the European satellite communications industry, and the benefits that it will bring to a wide range of European industries, in 2003 ESA initiated the "BGAN Extension" project. Its primary goals are to provide the full range of BGAN services to truly mobile platforms, operating in aeronautical, vehicular and maritime environments, and to introduce a multicast service capability. The project is supported by the ARTES Programme which establishes a collaboration agreement between ESA, Inmarsat and a group of key industrial and academic institutions which includes EMS, Logica, Nera and the University of Surrey (UK).

  7. Enhanced UK teletext: Experimental equipment for high-quality picture coding and other enhancements

    NASA Astrophysics Data System (ADS)

    Riley, J. L.

    1983-07-01

    The construction of a pair of microcomputer-based units which will serve as a research tool in engineering teletext enhancements, one unit a transmitter and the other a receiver in a closed-circuit teletext transmission is described. The microcomputer system and frame store design is basically similar to that currently used by Logica in the Flair electronic graphics equipment. Considerable effort was devoted to the development of software handling. The units are equipped with a CP/M operating system, which is already widely known. This greatly simplifies the management of files and includes compiling routines and a software debugging tool. Software is being prepared in PASCAL. Routines were developed to receive, generate, edit and transmit teletext in its present form. Early attention was given to demonstrating that picture teletext is feasible through a crudely-coded slow-scan television system. An acceptable sampling structure for these pictures and optimizing the coding of data to fit in with a hierarchy of coding embracing other aspects of enhanced teletext, for example, geometric drawing, electronic painting and telesoftware are addressed. A high quality character font was incorporated to improve the display of text.

  8. The Envisat-1 ground segment

    NASA Astrophysics Data System (ADS)

    Harris, Ray; Ashton, Martin

    1995-03-01

    The European Space Agency (ESA) Earth Remote Sensing Satellite (ERS-1 and ERS-2) missions will be followed by the Polar Orbit Earth Mission (POEM) program. The first of the POEM missions will be Envisat-1. ESA has completed the design phase of the ground segment. This paper presents the main elements of that design. The main part of this paper is an overview of the Payload Data Segment (PDS) which is the core of the Envisat-1 ground segment, followed by two further sections which describe in more detail the facilities to be offered by the PDS for archiving and for user servcies. A further section describes some future issues for ground segment development. Logica was the prime contractor of a team of 18 companies which undertook the ESA financed architectural design study of the Envisat-1 ground segment. The outputs of the study included detailed specifications of the components that will acquire, process, archive and disseminate the payload data, together with the functional designs of the flight operations and user data segments.

  9. Understanding genetics: Analysis of secondary students' conceptual status

    NASA Astrophysics Data System (ADS)

    Tsui, Chi-Yan; Treagust, David F.

    2007-02-01

    This article explores the conceptual change of students in Grades 10 and 12 in three Australian senior high schools when the teachers included computer multimedia to a greater or lesser extent in their teaching of a genetics course. The study, underpinned by a multidimensional conceptual-change framework, used an interpretive approach and a case-based design with multiple data collection methods. Over 4-8 weeks, the students learned genetics in classroom lessons that included BioLogica activities, which feature multiple representations. Results of the online tests and interview tasks revealed that most students improved their understanding of genetics as evidenced in the development of genetics reasoning. However, using Thorley's (1990) status analysis categories, a cross-case analysis of the gene conceptions of 9 of the 26 students interviewed indicated that only 4 students' postinstructional conceptions were intelligible-plausible-fruitful. Students' conceptual change was consistent with classroom teaching and learning. Findings suggested that multiple representations supported conceptual understanding of genetics but not in all students. It was also shown that status can be a viable hallmark enabling researchers to identify students' conceptual change that would otherwise be less accessible. Thorley's method for analyzing conceptual status is discussed.

  10. Eye region-based fusion technique of thermal and dark visual images for human face recognition

    NASA Astrophysics Data System (ADS)

    Bhowmik, Mrinal Kanti; Bhattacharjee, Debotosh; Basu, Dipak Kumar; Nasipuri, Mita

    2012-07-01

    We present an approach for human face recognition using eye region extraction/replacement method under low illumination and varying expression conditions. For conducting experiments, two different sets of face images, namely visual and corresponding thermal, are used from Imaging, Robotics, and Intelligent Systems (IRIS) thermal/visual face data. A decomposition and reconstruction technique of Daubechies wavelet co-efficient (db4) is used to generate the fused image by replacing the eye region in the visual image with the same region from the corresponding thermal image. After that, independent component analysis over the natural logarithm domain (Log-ICA) is used for feature extraction/dimensionality reduction, and finally, a classifier is used to classify the fused face images. Two different image sets, i.e., training and test image sets, are mainly prepared using the IRIS thermal/visual face database for finding the accuracy of the proposed system. Experimental results show the proposed method is more efficient than other image fusion techniques which have used region extraction techniques for dark faces.

  11. Regiones de formación de la línea de He II λ 1640 en una atmósfera en expansión

    NASA Astrophysics Data System (ADS)

    Venero, R.; Cidale, L.; Ringuelet, A.

    Se calculan perfiles de la línea del He II λ1640 empleando un modelo de atmósfera en expansión con una estructura cromosférica para determinar la región de formación de la línea. El problema se trata en geometría esférica, fuera de equilibrio termodinámico. La ecuación de transporte radiativo se resuelve rigurosamente en el marco de referencia del fluído para distintas leyes de velocidad, monótonamente crecientes, y diferentes leyes de temperatura. Se buscan relaciones globales entre las características del perfil y los parámetros físicos atribuídos a la atmósfera estelar, con la finalidad de definir una herramienta de diagnóstico de las propiedades del medio.

  12. Captura de galaxias enanas en cúmulos de galaxias

    NASA Astrophysics Data System (ADS)

    Bassino, L. P.; Muzzio, J. C.; Pérez, J.

    Se investiga el proceso de captura de galaxias enanas por parte de galaxias gigantes, en presencia de un campo externo causado por materia distribuída y otras galaxias pertenecientes al cúmulo en que se produce el fenómeno. Se trabaja mediante simulaciones numéricas, generando condiciones iniciales típicas de cúmulos de galaxias y representando, con un espectro de masas, a las galaxias más masivas y, como partículas de prueba, a las enanas. Se sigue la evolución del sistema empleando un código de integración de N-cuerpos y se analizan los resultados para determinar las capturas de galaxias enanas.

  13. Superconducting Complementary Output Switching Logic Operating at 10 - 18 GHz

    NASA Astrophysics Data System (ADS)

    Jeffery, Mark; van Duzer, T.; Perold, Willem

    1998-03-01

    We have developed a new type of superconducting voltage-state logic called Complementary Output Switching Logic> (COSL)(M. Jeffery, W. Perold, and T. Van Duzer, Appl. Phys. Lett., 69) (18), 2746 (1996). The basic COSL gates have been demonstrated at 10 GHz and complex 2-bit encoder circuits have operated at 5 - 8 GHz. The COSL gates have extremely low power dissipation, of order 10 μW/gate, and we have measured bit error rates less than 10-12 at 2 GHz. For these results we used the HYPRES 1 kA/cm^2 critical current density Nb Josephson fabrication process. In the present work we describe our recent test results using the new HYPRES 2.5 kA/cm^2 process. The increased critical current density process significantly improves the switching speed of the COSL devices. We will describe the Monte Carlo method used to optimize the COSL gates for 20 - 30 GHz operation, and the optimal circuit layouts including moats, or ground plane holes, to shield the circuits from trapped magnetic flux. Experimental test results will be presented for the basic COSL devices operating at 10 - 18 GHz. These are the fastest superconducting voltage-state logic devices ever reported, and may have many applications in low power ultra-high-speed digital systems of the future.

  14. Spectral CT using multiple balanced K-edge filters.

    PubMed

    Rakvongthai, Yothin; Worstell, William; El Fakhri, Georges; Bian, Junguo; Lorsakul, Auranuch; Ouyang, Jinsong

    2015-03-01

    Our goal is to validate a spectral computed tomography (CT) system design that uses a conventional X-ray source with multiple balanced K-edge filters. By performing a simultaneously synthetic reconstruction in multiple energy bins, we obtained a good agreement between measurements and model expectations for a reasonably complex phantom. We performed simulation and data acquisition on a phantom containing multiple rods of different materials using a NeuroLogica CT scanner. Five balanced K-edge filters including Molybdenum, Cerium, Dysprosium, Erbium, and Tungsten were used separately proximal to the X-ray tube. For each sinogram bin, measured filtered vector can be defined as a product of a transmission matrix, which is determined by the filters and is independent of the imaging object, and energy-binned intensity vector. The energy-binned sinograms were then obtained by inverting the transmission matrix followed by a multiplication of the filter measurement vector. For each energy bin defined by two consecutive K-edges, a synthesized energy-binned attenuation image was obtained using filtered back-projection reconstruction. The reconstructed attenuation coefficients for each rod obtained from the experiment was in good agreement with the corresponding simulated results. Furthermore, the reconstructed attenuation coefficients for a given energy bin, agreed with National Institute of Standards and Technology reference values when beam hardening within the energy bin is small. The proposed cost-effective system design using multiple balanced K-edge filters can be used to perform spectral CT imaging at clinically relevant flux rates using conventional detectors and integrating electronics. PMID:25252276

  15. [By way of a synthesis of its conceptual evolution towards scientific medicine].

    PubMed

    de Micheli-Serra, A

    1999-01-01

    A historic outline of the evolution of medical thought toward scientific medicine is presented. Galen from Pergamon, one of science's first philosophers, wrote an Institutio logica, which can be considered as an introduction to the scientific method. Later, the Nominalists of the XIV century, precursors of modern science, thought that science's object was not the general, vague and indeterminate, but the particular, which is real and can be known directly. About the middle of the XVII Century the bases of the modern science became established thanks to a revolution formented essentially by Galileo, Bacon and Descartes. During the XVIII Century, parallel to the development of the great current of English Empiricism, a movement of scientific renewal also arose in continental Europe following the discipline of the Dutch Physicians and of Boerhaave. In the last century, Claude Bernard dominated scientific medicine, but his rigorous determinism impeded him from taking into account the immense and unforeseeable field of the random. Nowadays, we approach natural science and medicine from particular groups of facts, that is, from the responses of Nature to specific questions, but not from general laws. Furthermore, in recent epistemology, the concept that experimental data are not pure facts, but rather, facts interpreted within a hermeneutical context has been established. Finally, a general tendency to retrieve philosophical questions concerning the understanding of essence and existence can frequently be seen in scientific inquiry. In the light of the evolution of medical thought, it is possible to establish the position of scientific medicine within the movement of ideas dominating in our time. PMID:10204312

  16. New technologies for supporting real-time on-board software development

    NASA Astrophysics Data System (ADS)

    Kerridge, D.

    1995-03-01

    The next generation of on-board data management systems will be significantly more complex than current designs, and will be required to perform more complex and demanding tasks in software. Improved hardware technology, in the form of the MA31750 radiation hard processor, is one key component in addressing the needs of future embedded systems. However, to complement these hardware advances, improved support for the design and implementation of real-time data management software is now needed. This will help to control the cost and risk assoicated with developing data management software development as it becomes an increasingly significant element within embedded systems. One particular problem with developing embedded software is managing the non-functional requirements in a systematic way. This paper identifies how Logica has exploited recent developments in hard real-time theory to address this problem through the use of new hard real-time analysis and design methods which can be supported by specialized tools. The first stage in transferring this technology from the research domain to industrial application has already been completed. The MA37150 Hard Real-Time Embedded Software Support Environment (HESSE) is a loosely integrated set of hardware and software tools which directly support the process of hard real-time analysis for software targeting the MA31750 processor. With further development, this HESSE promises to provide embedded system developers with software tools which can reduce the risks associated with developing complex hard real-time software. Supported in this way by more sophisticated software methods and tools, it is foreseen that MA31750 based embedded systems can meet the processing needs for the next generation of on-board data management systems.

  17. Spectral CT Using Multiple Balanced K-Edge Filters

    PubMed Central

    Rakvongthai, Yothin; Worstell, William; Fakhri, Georges El; Bian, Junguo; Lorsakul, Auranuch; Ouyang, Jinsong

    2015-01-01

    Our goal is to validate a spectral CT system design that uses a conventional X-ray source with multiple balanced K-edge filters. By performing a simultaneously synthetic reconstruction in multiple energy bins, we obtained a good agreement between measurements and model expectations for a reasonably complex phantom. We performed simulation and data acquisition on a phantom containing multiple rods of different materials using a NeuroLogica CT scanner. Five balanced K-edge filters including Molybdenum, Cerium, Dysprosium, Erbium, and Tungsten were used separately proximal to the X-ray tube. For each sinogram bin, measured filtered vector can be defined as a product of a transmission matrix, which is determined by the filters and is independent of the imaging object, and energy-binned intensity vector. The energy-binned sinograms were then obtained by inverting the transmission matrix followed by a multiplication of the filter measurement vector. For each energy bin defined by two consecutive K-edges, a synthesized energy-binned attenuation image was obtained using filtered back-projection reconstruction. The reconstructed attenuation coefficients for each rod obtained from the experiment was in good agreement with the corresponding simulated results. Furthermore, the reconstructed attenuation coefficients for a given energy bin, agreed with National Institute of Standards and Technology reference values when beam hardening within the energy bin is small. The proposed cost-effective system design using multiple balanced K-edge filters can be used to perform spectral CT imaging at clinically relevant flux rates using conventional detectors and integrating electronics. PMID:25252276

  18. OV-Wav: um novo pacote para análise multiescalar em astronomia

    NASA Astrophysics Data System (ADS)

    Pereira, D. N. E.; Rabaça, C. R.

    2003-08-01

    Wavelets e outras formas de análise multiescalar têm sido amplamente empregadas em diversas áreas do conhecimento, sendo reconhecidamente superiores a técnicas mais tradicionais, como as análises de Fourier e de Gabor, em certas aplicações. Embora a teoria dos wavelets tenha começado a ser elaborada há quase trinta anos, seu impacto no estudo de imagens astronômicas tem sido pequeno até bem recentemente. Apresentamos um conjunto de programas desenvolvidos ao longo dos últimos três anos no Observatório do Valongo/UFRJ que possibilitam aplicar essa poderosa ferramenta a problemas comuns em astronomia, como a remoção de ruído, a detecção hierárquica de fontes e a modelagem de objetos com perfis de brilho arbitrários em condições não ideais. Este pacote, desenvolvido para execução em plataforma IDL, teve sua primeira versão concluída recentemente e está sendo disponibilizado à comunidade científica de forma aberta. Mostramos também resultados de testes controlados ao quais submetemos os programas, com a sua aplicação a imagens artificiais, com resultados satisfatórios. Algumas aplicações astrofísicas foram estudadas com o uso do pacote, em caráter experimental, incluindo a análise da componente de luz difusa em grupos compactos de galáxias de Hickson e o estudo de subestruturas de nebulosas planetárias no espaço multiescalar.

  19. Enfermedad diarreica aguda por Escherichia coli patógenas en Colombia

    PubMed Central

    Gómez-Duarte, Oscar G.

    2014-01-01

    Resumen Las cepas de E. coli patógenas intestinales son causas importantes de la enfermedad diarreica aguda (EDA) en niños menores de 5 años en América Latina, África y Asia y están asociadas a alta mortalidad en niños en las comunidades más pobres de África y el Sudeste Asiático. Estudios sobre el papel de las E. coli patógenas intestinales en la EDA infantil en Colombia y otros países de América Latina son limitados debido a la carencia de ensayos para detección de estos patógenos en los laboratorios clínicos de centros de salud. Estudios recientes han reportado la detección de E. coli patógenas intestinales en Colombia, siendo la E. coli enterotoxigénica la cepa más frecuentemente asociada a diarrea en niños menores de 5 años. Otros patógenos detectados en estos pacientes incluyen las E. coli enteroagregativa, enteropatógena, productora de toxina Shiga, y de adherencia difusa. Con base en estudios que reportan la presencia de E. coli productora de toxina Shiga y E. coli enteroagregativa en carnes y vegetales en supermercados, se cree que productos alimentarios contaminados contribuyen a la transmisión de estos patógenos y a la infección del huésped susceptible. Más estudios son necesarios para evaluar los mecanismos de transmisión, el impacto en la epidemiologia de la EDA, y las pautas de manejo y prevención de estos patógenos que afectan la población pediátrica en Colombia. PMID:25491457

  20. Data-model comparison search analysis of coincident PBO Balmer α, EURD Lyman β geocoronal measurements from March 2000

    NASA Astrophysics Data System (ADS)

    Bishop, J.; Mierkiewicz, E. J.; Roesler, F. L.; Gómez, J. F.; Morales, C.

    2004-05-01

    Recent Lyman series and Balmer series airglow measurements provide a fresh opportunity to investigate the density distribution and variability of atomic hydrogen in the upper atmosphere. Dedicated nightside Balmer α Fabry-Perot spectrometer measurements at the Pine Bluff Observatory (PBO), University of Wisconsin-Madison, have been acquired since late 1999 taking advantage of several technological advances. Extreme ultraviolet spectral radiance measurements by the Espectrógrafo Ultravioleta extremo para la Radiación Difusa (EURD) instrument on the Spanish MINISAT-1 satellite from October 1997 to December 2001 provide extensive sets of geocoronal Lyman β, Lyman γ and He 584 Å emission intensities. In this paper, coincident EURD Lyman β and PBO Balmer α radiance measurements from the early March 2000 new moon period are presented. In addition to serving as examples of the data sets now available, the data volume poses an analysis challenge not faced in prior geocoronal studies. A data-model comparison search procedure employing resonance radiation transport results for extensive sets of parametric density distribution models is being developed for use in analyses of multiple large data sets; this is described, and example results for the PBO and EURD March 2000 data sets are presented. The tightness of the constraints obtained for the solar line-center Lyman β irradiance and the atomic hydrogen column abundance is somewhat surprising, given the crudeness of the parameter binning in the search procedure and the fact that a small number of recognized corrections remain to be made to each data set.

  1. Earth Observation in aid of surge monitoring and forecasting: ESA's eSurge Project

    NASA Astrophysics Data System (ADS)

    Harwood, Phillip; Cipollini, Paolo; Snaith, Helen; Høyer, Jacob; Dwyer, Ned; Dunne, Declan; Stoffelen, Ad; Donlon, Craig

    2013-04-01

    The understanding and realistic modelling of surges supports both preparation and mitigation activities and should eventually bring enormous societal benefits, especially to some of the world's poorest countries. Earth Observation data from satellites have an important role to play in storm surge monitoring and forecasting, but the full uptake of these data by the users (such as environmental agencies and tidal prediction centres) must be first encouraged by showcasing their usefulness, and then supported by providing easy access. The European Space Agency has recognized the above needs and, through its Data User Element (DUE) programme, has initiated in 2011 the eSurge project, whose aims are: a) to contribute through Earth Observation to an integrated approach to storm surge, wave, sea-level and flood forecasting as part of a wider optimal strategy for building an improved forecast and warning capability for coastal inundation; and b) to increase the use of the advanced capabilities of ESA and other satellite data for storm surge applications. The project is led by Logica UK, with NOC (UK), DMI (Denmark), CMRC (Ireland) and KNMI (Netherlands) as scientific partners. eSurge aims to provide easy access to a wide range of relevant data for a range of historical surge events, as well as performing a series of experiments to demonstrate the value of this data, and running workshops and training courses to help users make use of the available data. The eSurge database of Earth Observation and in situ measurements for past surge events is now publicly available. In 2013 the project moves into its service demonstration phase, adding more data and events, including a demonstration near real time service. The project works closely with its users in order to meet their needs and to maximise the return of this data. A novel dataset provided by eSurge is coastal altimetry. Coastal altimetry has a prominent role to play as it measures directly the total water level envelope

  2. The use of coastal altimetry to support storm surge studies in project eSurge

    NASA Astrophysics Data System (ADS)

    Cipollini, P.; Harwood, P.; Snaith, H.; Vignudelli, S.; West, L.; Zecchetto, S.; Donlon, C.

    2012-04-01

    One of the most promising applications of the new field of coastal altimetry, i.e. the discipline aiming to recover meaningful estimates of geophysical parameters (sea level, significant wave height and wind speed) from satellite altimeter data in the coastal zone, is the study of storm surges. The understanding and realistic modelling of surges supports both preparation and mitigation activities and should eventually bring enormous societal benefits, especially to some of the world's poorest countries (like Bangladesh). Earth Observation data have an important role to play in storm surge monitoring and forecasting, but the full uptake of these data by users (such as environmental agencies and tidal prediction centres) must first be encouraged by showcasing their usefulness, and then supported by providing easy access. Having recognized the above needs, The European Space Agency has recently launched a Data User Element (DUE) project called eSurge. The main purposes of eSurge are a) to contribute to an integrated approach to storm surge, wave, sea-level and flood forecasting through Earth Observation, as part of a wider optimal strategy for building an improved forecast and early warning capability for coastal inundation; and b) to increase the use of the advanced capabilities of ESA and other satellite data for storm surge applications. The project is led by Logica UK, with NOC (UK), DMI (Denmark), CMRC (Ireland) and KNMI (Netherlands) as scientific partners. A very important component of eSurge is the development, validation and provision of dedicated coastal altimetry products, which is the focus of the present contribution. Coastal altimetry has a prominent role to play as it measures the total water level envelope directly, and this is one of the key quantities required by storm surge applications and services. But it can also provide important information on the wave field in the coastal strip, which helps the development of more realistic wave models that in

  3. Reacciones de intercambio de carga

    NASA Astrophysics Data System (ADS)

    Errea, L. F.

    Se discute la validez de diversas metodologías y su aplicación al estudio de procesos de intercambio de carga electrónico entre iones y blancos atómicos y moleculares. Para energías de impacto entre 0.05 y 5 eV / amu se emplea el método cuántico de la Coordenada de Reacción Común (CRC). A mayores energías, se utiliza el método semiclásico iconal con un desarrollo de la función de onda dinámica en estados moleculares adiabáticos, modificados con un factor de traslación común (FTC). Estos estados pueden obtenerse con cálculos ab initio o empleando potenciales modelo. Cuando la ionización compite con la transferencia de carga, la inclusión de pseudoestados en estos desarrollos permite calcular simultáneamente las secciones eficaces de ambos procesos. Otra técnica utilizada es el método estadístico CTMC. En el tratamiento de colisiones ión-molécula (diatómica) contrastamos la aplicabilidad de distintos métodos, desde la llamada aproximación Franck-Condon hasta un desarrollo en estados vibrónicos, pasando por la aproximación súbita vibro-rotacional, obteniéndose secciones eficaces de captura electrónica total y a estados individuales, así como secciones de excitación vibracional a estados ligados y del continuo (disociación). En todos los casos es necesario calcular superficies de energía y los correspondientes acoplamientos dinámicos entre los estados. La aplicación de estos métodos permite determinar el grado de contaminación de los haces por estados metaestables en un experimento dado, el cambio en los resultados con diferentes isótopos, la importancia de procesos de doble captura, seguida de explosión culombiana, todo ello con precisión comparable a la de medidas experimentales, para sistemas de interés en distintos tipos de plasmas.

  4. Use of IPA to demonstrate loss of forest interior birds from isolated woodlots

    USGS Publications Warehouse

    Robbins, C.S.; Boone, D.D.

    1983-01-01

    'Empleo de indices puntuales de abundancia (IPA) para demostrar la perdida de aves forestales en bosques aislados'. En Maryland, E.U., se seleccionaron bloques boscosos de diferente superficie, divididos en seis clase de tamano (2,8-6 ha, 7-14, 20-30, 34-80, 105-1300, mayores de 4000 ha). En estas ?islas' forestales fue programado un conjunto de muestreos puntuales con estas caracteristicas: 1) Cada punto se visito tres veces. 2) En cada visita se hicieron cuatro censos consecutivos de 5 minutos de duracion, empleando diferentes simbolos para machos cantores, adultos no cantores, aves en vuelo y aves inmaduras. 3) Los conteos se hicieron en tres epocas: final de Mayo, mitad de Junio y final de Junio. 4) Se dividio el tiempo de censo en tres priodos horarios: 5,15-6,30 ; 6,30-8; 8-9,30 hrs. 5) Los puntos se agruparon en co juntos de 4 a 9, considerando que un conjunto es el nlimero que un observador puede cubrir por manana. 6) La vegetacion fue descrita exhaustivamente en cuanto composicion y fisionomla. El principal objetivo que se busca consiste en conocer los requisitos areales de ciertas especies de bosque muy sensibles a la fragmentacion del habitat. Puede observarse (Figura 1) que una serie de migrantes de largo alcance se asientan en relacion con el aumento de la superficie del rodal arbo1ado, sabre todo en macizos de 4.000 o mas hectareas. Sin embargo, las especies sedentarias (Fig. 2) tienen pauta de presencia irregular en funcion del area, forestal, con tendencia a presentarse menos en los bosques mas extensos, Dryocopus pileatus, por excepcion, reacciona negativamente al pequeno tamano de la parcela arbolado, prefiriendo bosques grandes. Parecida respuesta da tambien Sitta carolinensis. Aunque se sabe poco de las exigencias areales de las aves forestales americanas, el metodo de los IPA resulta muy adecuado para esta clase de investigacion de tanto interes en gestion ambiental, posibilitando colectar gran cantidad de datos comparables en un periodo de

  5. [Not Available].

    PubMed

    Chivu, Elena Cristina; Artero-Fullana, Ana; Alfonso García, Antonio; Sánchez Juan, Carlos

    2016-01-01

    Introducción: conociendo la elevada prevalencia de la desnutrición hospitalaria, se hace necesaria su detección precoz. Cuando, por diversos motivos, no es posible realizar una valoración completa del estado nutricional, se recomienda el empleo de herramientas validadas de cribado nutricional. Estas ayudarían a detectar de forma rápida a aquellos pacientes que necesiten de un tratamiento nutricional.Objetivos: determinar la prevalencia del riesgo de desnutrición, en el Hospital General Universitario de Valencia, empleando para ello la herramienta de cribado nutricional HEMAN y comprobar si la implementación de esta herramienta en la práctica clínica, sería lo más adecuado.Métodos: estudio transversal, realizado sobre una muestra de 1.099 pacientes ingresados en un hospital terciario. A todos ellos se les realizó el cribado nutricional HEMAN a las 24-48 horas del ingreso. Las variables cualitativas se compararon mediante Chi-cuadrado, y las cuantitativas mediante el test t de Student.Resultados: la prevalencia del riesgo de desnutrición fue del 33,5%. Los pacientes que resultaron positivos en el cribado (HEMAN ≥ 3), tenían mayor edad que los pacientes normonutridos, referían pérdidas de peso entre el 5-10%, el 55,2% disminuyó su ingesta a menos del 50% de la habitual. Además, ingresaron con patologías consideradas de leves a moderadas. La utilización del método HEMAN como herramienta de cribado, resultó ser práctica y efectiva, y ayudó a disminuir el tiempo empleado con cada paciente encuestado evaluado.Conclusiones: se detectó una elevada prevalencia de riesgo de desnutrición entre los pacientes evaluados, por lo tanto se hace imprescindible la utilización de métodos de cribado nutricional en la rutina diaria del hospital, para ello recomendamos especialmente la utilización del método HEMAN. PMID:27571664

  6. Impact of Intensive Physiotherapy on Cognitive Function after Coronary Artery Bypass Graft Surgery.

    PubMed

    Cavalcante, Elder Dos Santos; Magario, Rosmeiri; Conforti, César Augusto; Cipriano Júnior, Gerson; Arena, Ross; Carvalho, Antonio Carlos C; Buffolo, Enio; Luna Filho, Bráulio

    2014-11-01

    Background: Coronary artery bypass graft (CABG) is a standard surgical option for patients with diffuse and significant arterial plaque. This procedure, however, is not free of postoperative complications, especially pulmonary and cognitive disorders. Objective: This study aimed at comparing the impact of two different physiotherapy treatment approaches on pulmonary and cognitive function of patients undergoing CABG. Methods: Neuropsychological and pulmonary function tests were applied, prior to and following CABG, to 39 patients randomized into two groups as follows: Group 1 (control) - 20 patients underwent one physiotherapy session daily; and Group 2 (intensive physiotherapy) - 19 patients underwent three physiotherapy sessions daily during the recovery phase at the hospital. Non-paired and paired Student t tests were used to compare continuous variables. Variables without normal distribution were compared between groups by using Mann-Whitney test, and, within the same group at different times, by using Wilcoxon test. The chi-square test assessed differences of categorical variables. Statistical tests with a p value ≤ 0.05 were considered significant. Results: Changes in pulmonary function were not significantly different between the groups. However, while Group 2 patients showed no decline in their neurocognitive function, Group 1 patients showed a decline in their cognitive functions (P ≤ 0.01). Conclusion: Those results highlight the importance of physiotherapy after CABG and support the implementation of multiple sessions per day, providing patients with better psychosocial conditions and less morbidity.Fundamento: A cirurgia de revascularização miocárdica (CRM) é a opção cirúrgica padrão para pacientes com placas arteriais difusas e significativas. Tal procedimento, no entanto, não é desprovido de complicações pós-operatórias, especialmente distúrbios pulmonares e cognitivos. Objetivo: Comparar o impacto de duas abordagens fisioterap

  7. [In Process Citation].

    PubMed

    Martínez González, Olaia; Vélez de Mendizábal, Itsaso Zabaleta; Galarza Iriarte, Uxue; Vicente Martín, María Soledad; De Vega Castaño, María Del Carmen; Salmerón Egea, Jesús

    2016-01-01

    Introducción: la disfagia o dificultad de deglución afecta a 1 de cada 2 mayores hospitalizados y genera problemas de desnutrición o deshidratación, y aparición de neumonía por aspiración. En situaciones de disfagia orofaríngea, cuando la alimentación oral aún es posible, se deben espesar las texturas líquidas de cara a evitar dichas complicaciones. A los alimentos, tanto fríos como calientes, habitualmente se les añaden espesantes comerciales consistentes en almidones modificados siguiendo especificaciones muy generales que hacen difícil conseguir la textura adaptada a las necesidades personales. Objetivo: el objetivo de este trabajo fue estudiar el efecto de la temperatura del alimento (10 oC y 50 oC), la dosificación (néctar, miel y pudin) y el tiempo transcurrido desde la preparación (0, 3, 5, 10, 20 min) sobre los parámetros de textura de agua espesada a base de uno de los espesantes más ampliamente comercializados. Método: las muestras se analizaron por triplicado en un texturómetro TA.XT2i (Stable Micro Systems, UK) mediante ensayo de compresión-extrusión, empleando una sonda de 2,5 cm de diámetro a una velocidad de 3 mm/s y con una célula de carga de 5 kg. A partir de las curvas fuerza vs. tiempo obtenidas se cuantificaron parámetros indicadores de la firmeza, la adhesividad y el trabajo de las muestras. Resultados y conclusión: en general, los parámetros relacionados con la consistencia fueron significativamente (α < 0,05) superiores en las muestras a mayor temperatura, lo que se puede relacionar con fenómenos incipientes de gelatinización. A su vez, se observó un incremento en los valores de todos los parámetros de textura al aumentar la concentración del espesante y a medida que transcurría el tiempo desde la mezcla de este en el agua. Estos resultados apuntan a la necesidad de realizar un trabajo exhaustivo de caracterización, ampliado también a otros productos y matrices alimentarias, de cara a modelizar la

  8. Moléculas orgánicas no-rígidas

    NASA Astrophysics Data System (ADS)

    Senent Díez, M. L.

    . Las frecuencias fundamentales se han calculado en 208.0 cm-1 (torsión C-C) y 349.9 cm-1 (torsión OH). Se discute el método de cálculo que se ha empleado para la clasificación de los niveles. Los niveles rotacionales se han determinado empleando el método desarrollado para el estudio del ácido acético [2]. Se emplean la base de funciones rotacionales de [3]. A partir de los niveles se han determinado las constantes rotacionales y las constantes de distorsión centrífuga que se comparan con las experimentales de Herbst et al [3].

  9. Groundwater evolution beneath Hat Yai, a rapidly developing city in Thailand

    NASA Astrophysics Data System (ADS)

    Lawrence, A. R.; Gooddy, D. C.; Kanatharana, P.; Meesilp, W.; Ramnarong, V.

    2000-09-01

    de l'aquifère plus profond, ce qui aura, à long terme, des implications sur la qualité de l'eau. Les résultats fournis par des forages carottés et des piézomètres peu profonds sont présentés. La combinaison entre une concentration élevée en matières organiques, provenant de la recharge par les eaux usées domestiques, et la faible profondeur de la nappe a produit des conditions fortement réductrices dans le niveau supérieur et une mobilisation de l'arsenic. Un modèle analytique simple montre que les échelles de temps pour la drainance vers le bas, à partir de la surface au travers de l'imperméable supérieur vers l'aquifère semi-captif, sont de l'ordre de quelques dizaines d'années. Resumen. Muchas ciudades en el sur y sudeste de Asia carecen de sistemas de saneamiento, por lo que las aguas residuales urbanas son a menudo vertidas bien directamente al suelo o bien a canales de aguas superficiales. Esta práctica puede provocar la contaminación difusa de las aguas subterráneas someras. En Hat Yai, al sur de Tailandia, la percolación de aguas residuales urbanas ha producido un deterioro substancial de la calidad del acuífero somero sobre el que se sitúa la ciudad. Por ello, la mayor parte del suministro de agua potable se obtiene a partir de aguas subterráneas de acuíferos semiconfinados más profundos, localizados entre 30 y 50 m bajo la superficie. No obstante, el goteo desde el acuífero freático constituye una fracción importante de la recarga al acuífero profundo, hecho que tiene implicaciones en lo que respecta a la calidad del agua a largo plazo. Se presentan en este artículo los resultados de testigos de sondeos y de multi-piezómetros someros. El alto contenido en materia orgánica de las aguas urbanas, unido a la cercanía del nivel freático, ha producido la movilización de arsénico al crearse condiciones altamente reductoras. Un modelo matemático sencillo indica que el tiempo de tránsito desde la superficie hasta el acu

  10. Dual-porosity modeling of groundwater recharge: testing a quick calibration using in situ moisture measurements, Areuse River Delta, Switzerland

    NASA Astrophysics Data System (ADS)

    Alaoui, Abdallah; Eugster, Werner

    sensitivité ont montré que l'investigation de la couverture du sol est suffisante pour l'estimation locale de la RN du fait que l'eau traversant le plan du flux nul se trouverait sous la zone des racines et échapperait à l'évapotranspiration. La RN simulée sur les 0.70 m du sol sous les conditions d'équilibre était de 364 mm, ce qui est comparable aux mesures. Se propone un método sencillo para calibrar el modelo de doble porosidad "MACRO" mediante medidas in-situ obtenidas por TDR durante un breve ensayo de infiltración (2,8 horas), con el objetivo de estimar la recarga local al acuífero. Ésta ha sido modelada de dos formas: considerando los 3 m de suelo no saturado y empleando sólo desde la capa superior hasta el plano de flujo nulo (de 0 a 0,70 m). Se compara la recarga modelada con la recarga local medida en campo, la cual fue de 313 mm durante un ciclo anual (del 15 de octubre de 1990 al 15 de octubre de 1991). Las mejores simulaciones corresponden a la hipótesis de columna entera no saturada en condiciones de equilibrio, excluyendo el efecto de macroporos (valor de 330 mm), mientras que el resultado obtenido para condiciones de no equilibrio en la recarga local está sobreestimado (378 mm). Los análisis de sensibilidad muestran que la investigación del horizonte superior del suelo es suficiente para estimar la recarga local en este caso, ya que el agua almacenada por debajo de esta profundidad parece estar fuera del alcance típico de las raíces de la vegetación y no puede ser evapotranspirada. La recarga modelada en condiciones de equilibrio para la capa superior de 0,70 m de espesor es de 364 mm, valor aceptable respecto a las medidas.