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Sample records for motores electricos para

  1. Procedure for the energy evaluation of electric motors; Procedimiento para la evaluacion energetica de motores electricos

    Energy Technology Data Exchange (ETDEWEB)

    Feliz Quiroz, Marco Antonio [Universidad Autonoma Metropolitana (Mexico)

    2002-06-01

    The present article is not a complete treaty about motors, here it is simply tried to show a practical procedure to evaluate electric motors, in order to determine the economics of their possible replacement by others of high efficiency. With the former in mind, the included database is sustained in the information of a representative number of motors brands commercialized in Mexico, since to include all the brands sold in our country would not be practical and it would be outside the scope of this publication. [Spanish] El presente articulo no es todo un tratado acerca de motores, sencillamente aqui se pretende mostrar un procedimiento practico para evaluar los motores electricos, a fin de determinar la rentabilidad de su eventual reemplazo por otros de alta eficiencia. Por lo anterior, la base de datos incluida se sustente en la informacion de un numero representativo de marcas de motores comercializados en Mexico, ya que abarcar todas las marcas vendidas en nuestro pais no seria practico y quedaria fuera del alcance de esta publicacion.

  2. The optimization of electric motors repair techniques as a mean for electric energy saving; La optimizacion de las tecnicas de reparacion de motores electricos como un medio para ahorrar energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Zagal Leon, Juan Ruben [Fideicomiso para el Ahorro de Energia Electrica (FIDE), Mexico, D. F. (Mexico)

    1998-12-31

    This paper presents, in a very concise, which are the techniques to optimize the electric motors repair made by the Fideicomiso para el Ahorro de Energia Electrica (FIDE), the loss of efficiency that might exist after repairing an electric motor, as well as the procedures to perform an optimum reparation of the electric motors. Furthermore, some recommendations are given for the selection of an adequate rewinding shop to guarantee that the motor does not suffer efficiency losses after its repair. [Espanol] Este trabajo presenta, de manera muy concreta, cuales son las tecnicas para optimizar las tecnicas de reparacion de motores electricos realizado por el Fideicomiso para el Ahorro de Energia Electrica (FIDE), el nivel de perdida de eficiencia que puede existir despues de reparar un motor electrico, asi como los procedimientos para realizar una optima reparacion en motores electricos. Asimismo, se proporcionan algunas recomendaciones para seleccionar un taller de reembobinado adecuado para garantizar que el motor no sufra perdidas de eficiencia despues de su reparacion.

  3. The optimization of electric motors repair techniques as a mean for electric energy saving; La optimizacion de las tecnicas de reparacion de motores electricos como un medio para ahorrar energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Zagal Leon, Juan Ruben [Fideicomiso para el Ahorro de Energia Electrica (FIDE), Mexico, D. F. (Mexico)

    1999-12-31

    This paper presents, in a very concise, which are the techniques to optimize the electric motors repair made by the Fideicomiso para el Ahorro de Energia Electrica (FIDE), the loss of efficiency that might exist after repairing an electric motor, as well as the procedures to perform an optimum reparation of the electric motors. Furthermore, some recommendations are given for the selection of an adequate rewinding shop to guarantee that the motor does not suffer efficiency losses after its repair. [Espanol] Este trabajo presenta, de manera muy concreta, cuales son las tecnicas para optimizar las tecnicas de reparacion de motores electricos realizado por el Fideicomiso para el Ahorro de Energia Electrica (FIDE), el nivel de perdida de eficiencia que puede existir despues de reparar un motor electrico, asi como los procedimientos para realizar una optima reparacion en motores electricos. Asimismo, se proporcionan algunas recomendaciones para seleccionar un taller de reembobinado adecuado para garantizar que el motor no sufra perdidas de eficiencia despues de su reparacion.

  4. Selection of electric motors for industrial processes with the rational energy use criteria; Seleccion de motores electricos para procesos industriales con criterios de uso racional de la energia

    Energy Technology Data Exchange (ETDEWEB)

    Morales Collantes, Arturo [Universidad Nacional Autonoma de Mexico, Mexico, D. F. (Mexico)

    1993-12-31

    Under the energy and ecological crisis we are now going through, but fundamentally because as human beings we can not keep on acting in such a thoughtless way, I write these notes, with the intention that we take more into consideration that whatever we do to improve the ways of energy consumption, will ease the human life preservation. The electric motors selection, plays an important roll in this respect, since it represents the highest percentage of electric energy consumption at national level. Therefore I will point out some basic criteria for an adequate selection. [Espanol] Ante la crisis energetica y ecologica por la que actualmente pasamos, pero fundamentalmente porque como seres humanos no podemos seguir actuando en forma tan irreflexiva, escribo estas notas, con la intencion de que tomemos mas en cuenta, que lo que hagamos para mejorar las formas de consumo de energia, facilitara la preservacion de la vida humana. La seleccion de motores electricos, juega un importante papel al respecto, ya que representa el mayor porcentaje del consumo de energia electrica a nivel nacional, por lo tanto senalare algunos criterios basicos para una adecuada seleccion.

  5. Selection of electric motors for industrial processes with the rational energy use criteria; Seleccion de motores electricos para procesos industriales con criterios de uso racional de la energia

    Energy Technology Data Exchange (ETDEWEB)

    Morales Collantes, Arturo [Universidad Nacional Autonoma de Mexico, Mexico, D. F. (Mexico)

    1992-12-31

    Under the energy and ecological crisis we are now going through, but fundamentally because as human beings we can not keep on acting in such a thoughtless way, I write these notes, with the intention that we take more into consideration that whatever we do to improve the ways of energy consumption, will ease the human life preservation. The electric motors selection, plays an important roll in this respect, since it represents the highest percentage of electric energy consumption at national level. Therefore I will point out some basic criteria for an adequate selection. [Espanol] Ante la crisis energetica y ecologica por la que actualmente pasamos, pero fundamentalmente porque como seres humanos no podemos seguir actuando en forma tan irreflexiva, escribo estas notas, con la intencion de que tomemos mas en cuenta, que lo que hagamos para mejorar las formas de consumo de energia, facilitara la preservacion de la vida humana. La seleccion de motores electricos, juega un importante papel al respecto, ya que representa el mayor porcentaje del consumo de energia electrica a nivel nacional, por lo tanto senalare algunos criterios basicos para una adecuada seleccion.

  6. Qualification of electric motors class 1E for supply of motors and its repair; Calificacion de motores electricos clase 1E para el suministro de motores alternativos a los orginales y su reparacion

    Energy Technology Data Exchange (ETDEWEB)

    Perez, E.; Gonzalez, J. J.; Fernandez, A.; Garcia, D.

    2005-07-01

    Different original suppliers of nuclear grade equipment have either disappeared or discontinued the manufacture of this kind equipment. Under this situation nuclear plants are experiencing difficulties when dealing with the substitution or maintenance of these equipment. Tecnatom and Cantarey have developed a new line of Class 1E qualified electric low voltage motors which can be used as an alternative to originally installed safety-related motors or for its repair and maintenance. (Author)

  7. Behavior of high efficiency electric motors; Comportamiento de motores electricos de alta eficiencia

    Energy Technology Data Exchange (ETDEWEB)

    Bonett, Austin H. [IEEE, (United States)

    2001-09-01

    articulo es presentar las diferencias en los niveles de calidad, confiabilidad y parametros de operacion del motor electrico tipo jaula de ardilla de alta eficiencia con los de los motores de manufactura estandar.

  8. Control optimo de par para maquinas SynRM aplicadas a vehiculo electrico

    OpenAIRE

    Trancho, Elena; Ibarra, E.; Arias, A.; Kortabarria, I.

    2017-01-01

    Las maquinas de reluctancia sincrona asistidas por imanes estan atrayendo un considerable interes como alternativa a las maquinas sıncronas de imanes permanentes para su uso en sistemas de propulsion de vehıculos electricos. El control optimo de estas maquinas (incluyendo operacion en debilitamiento de campo) puede resultar complejo, ya que estas son, por lo general, muy sensibles al fenomeno de la saturacion magnetica. En este articulo se trata su control, desde los reguladores hasta el prec...

  9. Methodology for electrical studies in industrial networks including the study of electric arc; Metodologia para los estudios electricos en redes industriales incluyendo el estudio de arco electrico

    Energy Technology Data Exchange (ETDEWEB)

    Rasgado Casique, Jose Pepe; Silva Farias, Jose Luis [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: jrasgado@iie.org.mx; jlsilva@iie.org.mx

    2010-11-15

    This article presents a methodology for conducting electrical studies in industrial networks. The methodology included the study of arc flash as a very important area of current basic electrical studies, such as power flow, short circuit and coordination. The aim of this study is to determine the Personal Protective Equipment (PPE) and flash protection boundary for personnel working with or near energized equipment, based on the IEEE Std 1584-2004 and NFPA-70E- 2004. Also included are criteria and recommendations to reduce incident energy level (cal/cm{sup 2}). At work we used a distribution network for industrial type test. The studies were carried out using a commercial program for the analysis of electrical networks. [Spanish] En este articulo se presenta una metodologia para llevar a cabo los estudios electricos en redes industriales. En la metodologia se incluye al estudio de arco electrico como un area muy importante de los estudios electricos basicos actuales, como: flujos de potencia, cortocircuito y coordinacion de protecciones. El objetivo de dicho estudio es determinar el Equipo de Proteccion Personal (EPP) apropiado y los limites de proteccion para el personal que opera con o cerca de equipo energizado, con base en las normas IEEE Std. 1584-2004 y la NFPA-70E-2004. Ademas, se incluyen criterios y recomendaciones para disminuir el nivel de energia incidente (cal/cm{sup 2}). En el trabajo se utilizo una red de distribucion tipo industrial de prueba. Los estudios se llevaron a cabo utilizando un programa comercial para el analisis de redes electricas.

  10. Measurement and control techniques for electric equipment development; Tecnicas de medicion y control para el desarrollo de equipos electricos

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz Neblina, Joaquin [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1988-12-31

    In broad outlines the measuring and control techniques that are used in the electric equipment development in the short circuit laboratories, are described. In this article the utilization criteria of the traditional and modern (analogical and digital) instruments are described as well as the tendency towards the system`s integration for the automation of the measurement and control processes. Also, mention is made of the systems currently being developed at the Instituto de Investigaciones Electricas (IIE) to be applied at the Short Circuit Laboratories of Comision Federal de Electricidad (CFE) and of the IIE. [Espanol] Se describen a grandes rasgos las tecnicas de medicion y control que se emplean para el desarrollo de equipos electricos en los laboratorios de corto circuito. En este articulo se describen los criterios de utilizacion de los instrumentos tradicionales y modernos (analogicos y digitales), asi como la tendencia hacia la integracion de sistemas para la automatizacion de los procesos de medicion y control. Tambien se mencionan los sistemas que actualmente se desarrollan en el Instituto de Investigaciones Electricas (IIE) para aplicarlos en los Laboratorios de Corto Circuito de la Comision Federal de Electricidad (CFE) y del Instituto.

  11. Measurement and control techniques for electric equipment development; Tecnicas de medicion y control para el desarrollo de equipos electricos

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz Neblina, Joaquin [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1987-12-31

    In broad outlines the measuring and control techniques that are used in the electric equipment development in the short circuit laboratories, are described. In this article the utilization criteria of the traditional and modern (analogical and digital) instruments are described as well as the tendency towards the system`s integration for the automation of the measurement and control processes. Also, mention is made of the systems currently being developed at the Instituto de Investigaciones Electricas (IIE) to be applied at the Short Circuit Laboratories of Comision Federal de Electricidad (CFE) and of the IIE. [Espanol] Se describen a grandes rasgos las tecnicas de medicion y control que se emplean para el desarrollo de equipos electricos en los laboratorios de corto circuito. En este articulo se describen los criterios de utilizacion de los instrumentos tradicionales y modernos (analogicos y digitales), asi como la tendencia hacia la integracion de sistemas para la automatizacion de los procesos de medicion y control. Tambien se mencionan los sistemas que actualmente se desarrollan en el Instituto de Investigaciones Electricas (IIE) para aplicarlos en los Laboratorios de Corto Circuito de la Comision Federal de Electricidad (CFE) y del Instituto.

  12. Mobil laboratory for the evaluation on site of the power electric equipment, second generation; Laboratorio movil para la evaluacion en sitio del equipo electrico de potencia, segunda generacion

    Energy Technology Data Exchange (ETDEWEB)

    Carrillo C, Jaime; Escorsa M, Oscar; Estrada G, Javier A; Iturbe F, Marlene; Robles P, Edgar [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2005-07-01

    To the interior of the Generation of Electrical Equipment (GEE) of the Instituto de Investigaciones Electricas, one of the main activities is the diagnosis of the electrical equipment in service. It is well known that the power equipment represents a strong investment that requires the guarantee that it has been manufactured, installed and operated satisfactorily. The life expectancy of these devices is of thirty years, however, many of them already have surpassed that expectation. The rehabilitation or substitution of the equipment implies new investments that are needed for an evaluation of the real condition of the equipment to carry out such rehabilitation. One of the tools necessary to carry out the diagnosis, is a movable laboratory that facilitates all the necessary tools to perform a meticulous analysis that would allow, the client, to make high cost decisions. The application of the movable laboratory is advisable from the inauguration of the equipment. The electrical mechanisms are factory tested in accordance with standardized protocols; it guarantees the fulfillment of the necessary requirements for a correct operation. Nevertheless, when taking them to the assembly site, these are subjected to a series of processes and mechanical stresses that could alter the equipment conditions and its integrity. [Spanish] Al interior de la Generacion de Equipos Electricos (GEE) del Instituto de Investigaciones Electricas, una de las principales actividades es el diagnostico del equipo electrico en servicio. Es bien sabido que los equipos de potencia representan una fuerte inversion que requiere la garantia de que se ha fabricado, instalado y operado satisfactoriamente. La esperanza de vida de estos dispositivos es de treinta anos, no obstante, muchos de ellos ya han superado esa expectativa. La rehabilitacion o sustitucion de equipos, implica nuevas inversiones que precisan un conocimiento del estado real del equipo para llevarla a cabo. Una de las herramientas

  13. Methodology for the location of PMU for the monitoring of critical oscillations in power systems; Metodologia para la ubicacion de PMU para el monitoreo de oscilaciones criticas en sistemas electricos de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Calderon Guizar, Jorge Guillermo [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2009-07-01

    The deregulation and restructuring undergone by the electrical industry, as well as the tendency at world-wide level of reorganization in generation, transmission and distribution units has brought about, as a consequence, drastic changes in the operation of the electric power systems. The difficulties to construct new transmission power lines and the continuous increase in the electricity consumption are forcing more and more to operate the electric power systems every time nearer their safety limits. Nevertheless, to assure the system reliability without mattering what so plaintiff is the operating condition is a requirement that the electrical companies must satisfy. This panorama has motivated and impelled the use of new technologies for the critical indicators the monitoring that allow the electrical companies to guarantee the system safe operation. In this paper a methodology for the location of Fasorial Measurement Units, better known as FMU for the monitoring of the critical oscillation modes in the electric power systems is presented. [Spanish] La desregulacion y reestructuracion experimentada por la industria electrica, asi como la tendencia a nivel mundial de reorganizacion en unidades de generacion, transmision y distribucion ha traido como consecuencia cambios drasticos en la operacion de los sistemas electricos de potencia. Las dificultades para construir nuevas lineas de transmision y el incremento continuo en el consumo de electricidad estan forzando a operar el sistema electrico de potencia cada vez mas cerca de sus limites de seguridad. Sin embargo, asegurar la confiabilidad del sistema sin importar que tan demandante sea la condicion de operacion es un requisito que las companias electricas deben satisfacer. Este panorama ha motivado e impulsado el uso de nuevas tecnologias para el monitoreo de indicadores criticos que permitan a las companias electricas garantizar una operacion segura del sistema. En este trabajo se presenta una metodologia para

  14. Methodology for the location diagnosis of electrical faults in electric power systems; Metodologia para el diagnostico de ubicacion de fallas en sistema electricos de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Rosas Molina, Ricardo

    2008-08-15

    tareas mas afectada por esta situacion es la operacion de los sistemas electricos frente a la presencia de fallas, donde la primera labor a realizar por parte del personal de operacion de la red es la pronta ubicacion del lugar de falla dentro del sistema. En el presente trabajo se aborda el problema del diagnostico de ubicacion de fallas electricas en sistemas de potencia, desde la perspectiva de los operadores de los centros de control de energia de una empresa electrica. El objetivo de este trabajo de tesis es describir una metodologia de analisis de operacion de protecciones como base para el desarrollo de un sistema de diagnostico de ubicacion de fallas, que permita estimar los posibles lugares de falla dentro del sistema asi como una justificacion de la operacion de las protecciones ante un disturbio como apoyo a los operadores de los Centros de Control de Energia. La metodologia esta disenada para utilizar distintos tipos de informacion, discreta, continua y controles. Sin embargo, en el desarrollo de la presente etapa de la metodologia propuesta se hace uso exclusivamente de la informacion de tipo discreta de los estados de interruptores y operacion de relevadores, asi como de la conectividad de los elementos de la red. La metodologia de analisis consiste en determinar el grupo de elementos donde pudo haber ocurrido la falla, utilizando las zonas de cobertura de las protecciones asociadas a los interruptores operados. Posteriormente, estas alternativas de falla se ordenan en forma descendentes de posibilidad utilizando indices de clasificacion y analisis basados en logica difusa.

  15. Actions in the electrical sector to propitiate the environmental protection; Acciones en el sector electrico para propiciar la proteccion ambiental

    Energy Technology Data Exchange (ETDEWEB)

    Trevino Gaspari, Mateo [Fideicomiso de Ahorro de Energia (FIDE) (Mexico)

    1997-07-01

    The saving of electrical energy is one of the most efficient means to propitiate the environmental protection in the surroundings of the facilities used in the production of electrical energy. The emission of polluting agents associated with the electric power generation is analyzed, among them, CO{sub 2}, SO{sub 2} and NO{sub 2}, along with the particulate emission of ash or soot. In addition, an analysis is made of the contribution of the electrical energy saving to the environmental protection and the actions that the Comision Federal de Electricidad of Mexico will undertake on the electric energy saving for the 1995 to the 2000 period. [Spanish] El ahorro de energia electrica es uno de los medios mas eficientes para propiciar la proteccion ambiental en el entorno de las instalaciones usadas en la produccion de energia electrica. Se analiza la emision de contaminantes asociados con la generacion electrica, entre ellos, el CO{sub 2}, el SO{sub 2} y NO{sub 2}, junto con la emision de particulas de ceniza o de hollin. Ademas se analiza la contribucion del ahorro de energia electrica a la proteccion ambiental y las acciones que emprendera la Comision Federal de Electricidad de Mexico sobre ahorro de energia electrica para el periodo 1995 al 2000.

  16. Comparative analysis of energy economy among different types of electric motor driving; Analise comparativa de economia de energia entre diferentes tipos de acionamento de motores electricos

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Marcelo Santos da; Oliveira, Carlos Henrique, e-mails: mcelo_sant@ig.com.br; caique1979@yahoo.com.br; Albuquerque, Carlos Jesivan Marques; Fortes, Marcio Zamboti [Universidade Severino Sombra (USS), Vassouras, RJ (Brazil)], e-mails: cjesivan@uss.br; mzamboti@uss.br

    2008-07-01

    The application of controlled drives loads of small power can cause undesirable disturbances for electrical installations, but it brings some benefits when comparing the energy consumption that this application has on its regular period of operation. This study analyses using comparatives, the electrical economy using the different types of drives for three phase electric induction motors of low voltage. Running up tests on the test bench didactic, the inverter drives, soft starter and contactor switch were analyzed for different loads (motor without load, 50% and 100% load), rating in S1 and S4. (author)

  17. Fault detection in the electrical equipment of the artificial system, used for the oil production in marine platforms; Deteccion de fallas en los equipos electricos del sistema artificial, utilizado para la produccion de petroleo en plataformas marinas

    Energy Technology Data Exchange (ETDEWEB)

    Vargas H, Vicente; Rosales S, Inocente [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Pimentel M, Jorge [Petroleos Mexicanos (Mexico)

    2007-07-01

    At present, PEMEX is using new artificial pumping systems for the production of oil, specifically the Electro Centrifugal Pumping system (ECP). Nevertheless, during the operation of the (ECP) system problems by the failure of their electrical components have appeared, mainly of the equipment installed within the well. The faults have resulted in an increased cost for the diminution in the production and the maintenance cost of the remedial work. The maintenance personnel have procedures to perform verification tests of the conditions of the bottom electrical equipment. But, in the case of an electrical failure of the equipment, its location cannot be determined, since they are installed at 3,600 m from the production wellhead. In accordance with the former, the Instituto de Investigaciones Electricas proposed the application of the reflectometry technique in the time domain, to complement the maintenance procedures. This technique is a very useful diagnosis tool of the electrical equipment, which helps in the decision making of the maneuvers of preventive and corrective maintenance to be followed, with the consequent saving of resources. [Spanish] Actualmente, PEMEX esta utilizando nuevos sistemas artificiales de bombeo para la produccion de petroleo, en especifico el Sistema de Bombeo Electrocentrifugo (BEC). Sin embargo, durante la operacion del Sistema BEC se han presentado problemas por la falla de sus componentes electricos, sobre todo del equipo instalado dentro del pozo. Las fallas han resultado con un costo elevado por la disminucion en la produccion y por los trabajos de mantenimiento correctivo. El personal de mantenimiento cuenta con procedimientos para realizar pruebas de verificacion del estado de los equipos electricos de fondo. Pero, en el caso de una falla electrica de los equipos, no se puede determinar su ubicacion, dado que se instalan a 3,600 m del cabezal del pozo de produccion. De acuerdo con lo anterior, el Instituto de Investigaciones

  18. Industrial manufacturing of electric insulators; Fabricacion industrial de aisladores electricos

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez, Lucia [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1988-12-31

    Porcelain is the insulating material more extensively used for electric insulators manufacturing, due to its dielectric properties; nevertheless, it presents fragility problems of manufacture and of resistance to the thermal shock, among others. For this reason studies are being conducted for the substitution of porcelain in the electric insulators manufacturing. In this area, the Instituto de Investigaciones Electricas developed an improved insulating formulation - the polymeric concrete- and an industrial prototype machine for the manufacture of high voltage electric insulators for outdoors use. [Espanol] La porcelana es el material aislante electrico mas utilizado en la elaboracion de aisladores electricos, debido a sus propiedades dielectricas; sin embargo, presenta problemas de fragilidad, de fabricacion y de baja resistencia al choque termico, entre otros. Es por ello que se realizan estudios para sustituir la porcelana en la fabricacion de aisladores electricos. En este campo, el Instituto de Investigaciones Electricas desarrollo una formulacion aislante mejorada -el concreto polimerico- y una maquina prototipo industrial para fabricar aisladores electricos de alto voltaje para uso en exteriores.

  19. Industrial manufacturing of electric insulators; Fabricacion industrial de aisladores electricos

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez, Lucia [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1987-12-31

    Porcelain is the insulating material more extensively used for electric insulators manufacturing, due to its dielectric properties; nevertheless, it presents fragility problems of manufacture and of resistance to the thermal shock, among others. For this reason studies are being conducted for the substitution of porcelain in the electric insulators manufacturing. In this area, the Instituto de Investigaciones Electricas developed an improved insulating formulation - the polymeric concrete- and an industrial prototype machine for the manufacture of high voltage electric insulators for outdoors use. [Espanol] La porcelana es el material aislante electrico mas utilizado en la elaboracion de aisladores electricos, debido a sus propiedades dielectricas; sin embargo, presenta problemas de fragilidad, de fabricacion y de baja resistencia al choque termico, entre otros. Es por ello que se realizan estudios para sustituir la porcelana en la fabricacion de aisladores electricos. En este campo, el Instituto de Investigaciones Electricas desarrollo una formulacion aislante mejorada -el concreto polimerico- y una maquina prototipo industrial para fabricar aisladores electricos de alto voltaje para uso en exteriores.

  20. Comparison of standards to determine the efficiency of three-phase induction motors; Comparacion de normas para determinar la eficiencia de motores de induccion trifasicos

    Energy Technology Data Exchange (ETDEWEB)

    Renier, B and others [IEEE, (United States)

    2001-09-01

    The Mexican industry often acquires from different countries, complete systems of production or auxiliaries, most of them impelled by squirrel cage electric motors, whose efficiency stated by the manufacturer is calculated by applying regional or local standards. For this reason, for the accomplishment of an energy balance -one of the first steps to follow is to determine the saving potential of a plant- it is important to know how the mentioned motor saving potentials were evaluated. It is worthwhile to indicate that an incorrect estimation could get to modify the economics of the applied measures. [Spanish] La industria mexicana a menudo adquiere de distintos paises, sistemas completos de produccion o auxiliares, la mayor parte de los cuales estan impulsados por motores electricos tipo aula de ardilla cuya eficiencia declarada por el fabricante se calcula aplicando normas regionales o locales. Por tal motivo, para la realizacion de un balance de energia -uno de los primeros pasos a seguir para determinar los potenciales de ahorro de una planta- resulta importante conocer como fueron evaluadas los mencionados motores. Cabe senalar que una estimacion incorrecta pudiera llegar a modificar la rentabilidad de la medida aplicada.

  1. Systems for the calculation of electrical parameters and energy efficiency for high-capacity hydroelectric generators; Sistemas para el calculo de parametros electricos y eficiencia energetica para generadores hidroelectricos de gran capacidad

    Energy Technology Data Exchange (ETDEWEB)

    Reyes Martinez, Oscar Alfonso; Pascacio de los Santos, Alberth; Perez Abad, Carlos Alberto [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Leon Rivera, Nicolas [CFE-LAPEM, Irapuato, Guanajuato (Mexico)

    2012-07-01

    construccion es la Central Hidroelectrica La Yesca, el cual concluira a finales de 2012 y consiste en dos generadores electricos de 375 MW, 17 kV. Sera el segundo en potencia y el tercero en generacion electrica en el sistema. De acuerdo con las normas nacionales e internacionales, debe efectuarse un conjunto de pruebas estaticas y dinamicas en estos generadores antes de la puesta en servicio, para asegurar su operacion apropiada. La prueba de resistencia de alto voltaje del devanado del estator, la prueba de corto circuito subito trifasico y el calculo de eficiencia energetica son algunas de las pruebas mas importantes por realizar en un nuevo generador electrico. Estas pruebas son dificiles de efectuar en sitio debido a la capacidad del equipo requerido, por lo que muy pocas companias en el mundo pueden conducirlas.

  2. Solar and electric automobiles: An idea whose time has come; Automoviles solares y electricos: Una idea cuyo tiempo ha llegado

    Energy Technology Data Exchange (ETDEWEB)

    Padilla, Beatriz [Academia de la Investigacion Cientifica, A. C., Mexico, D. F. (Mexico)

    1993-12-31

    Given the dependence of our transport system in combustible hydrocarbons that, besides generating serious pollution levels, eventually will become scarce, severely affecting the world economy- it is compulsory to develop non polluting transportation, capable of operating with alternative energies. In the avant-guard of this technological achievement are the competition solar automobiles, that have made great contributions (particularly for the rigorous application of the design for efficiency principles) in the development of the applicable technology to the electric vehicles. Tonatiuh is the first competition solar car built in Mexico. In 1993 Tonatiuh will compete in the Rally Formula Sol in Mexico and in the World Solar of Australia. A superficial comparison of electric vehicles with vehicles equipped with internal combustion motors, demonstrates the great advantages of the first ones, most of all at the light of the current technological advances propitiated by laws that demand them for the sale of electric vehicles. This incipient industry presents a great opportunity for Mexico, since the markets are not saturated and exist large areas of research and development. For improvement of the air quality in Mexico city, the electric vehicle would have a very positive impact, mostly applied to public transportation. [Espanol] Dada la dependencia de nuestro sistema de transporte en hidrocarburos combustibles que, ademas de generar graves niveles de contaminacion eventualmente escacearan, afectando severamente la economia mundial - es imperativo desarrollar transportes no contaminantes capaces de operar con energias alternativas. En la vanguardia de esta avanzada tecnologia se encuentran los autos solares de carreras, los cuales han hecho grandes aportaciones (particularmente por la aplicacion rigurosa de los principios del diseno para eficiencia) el desarrollo de tecnologia aplicable a vehiculos electricos. Tonatiuh es el primer auto solar de carreras que se

  3. Solar and electric automobiles: An idea whose time has come; Automoviles solares y electricos: Una idea cuyo tiempo ha llegado

    Energy Technology Data Exchange (ETDEWEB)

    Padilla, Beatriz [Academia de la Investigacion Cientifica, A. C., Mexico, D. F. (Mexico)

    1992-12-31

    Given the dependence of our transport system in combustible hydrocarbons that, besides generating serious pollution levels, eventually will become scarce, severely affecting the world economy- it is compulsory to develop non polluting transportation, capable of operating with alternative energies. In the avant-guard of this technological achievement are the competition solar automobiles, that have made great contributions (particularly for the rigorous application of the design for efficiency principles) in the development of the applicable technology to the electric vehicles. Tonatiuh is the first competition solar car built in Mexico. In 1993 Tonatiuh will compete in the Rally Formula Sol in Mexico and in the World Solar of Australia. A superficial comparison of electric vehicles with vehicles equipped with internal combustion motors, demonstrates the great advantages of the first ones, most of all at the light of the current technological advances propitiated by laws that demand them for the sale of electric vehicles. This incipient industry presents a great opportunity for Mexico, since the markets are not saturated and exist large areas of research and development. For improvement of the air quality in Mexico city, the electric vehicle would have a very positive impact, mostly applied to public transportation. [Espanol] Dada la dependencia de nuestro sistema de transporte en hidrocarburos combustibles que, ademas de generar graves niveles de contaminacion eventualmente escacearan, afectando severamente la economia mundial - es imperativo desarrollar transportes no contaminantes capaces de operar con energias alternativas. En la vanguardia de esta avanzada tecnologia se encuentran los autos solares de carreras, los cuales han hecho grandes aportaciones (particularmente por la aplicacion rigurosa de los principios del diseno para eficiencia) el desarrollo de tecnologia aplicable a vehiculos electricos. Tonatiuh es el primer auto solar de carreras que se

  4. Study of a hybrid solar-electric oven to the curing composite materials used in aeronautics; Estudio de un horno hibrido solar-electrico para el curado de materiales compuestos utilizados en aeronautica

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez Roman, M. A.; Pineda Pinon, J.; Sanchez Sanchez, A. [CICATA - Unidad Queretaro, Santiago de Queretaro, Queretaro (Mexico)]. E-mail: mhernandezr0900@ipn.mx

    2010-11-15

    The study covers the curing of advanced composites in a hybrid solar electric oven. The furnace uses electricity from the grid power and solar energy provided by the heliostat concentrator system. The materials used in the experiments will be composite materials such as prepreg. The prepreg are fiberglass and carbon fiber. The resin used in the pre-impregnate will be epoxy resin. The work temperatures inside the furnace will be maximum 300 degrees Celsius. The obtained results will be useful to characterize the use of the solar energy and the characterize of the curing chamber. [Spanish] Se presenta el alcance para el estudio, el cual abarca el curado de materiales compuestos avanzados dentro de un horno hibrido solar electrico. El horno utilizara energia electrica suministrada por la red y energia solar suministrada por el sistema heliostato concentrador. Los materiales utilizados en los experimentos seran materiales compuestos tipo prepreg. Los prepreg seran de fibra de vidrio y de fibra de carbono. La resina utilizada en el preimpregando sera resina epoxica. Las temperaturas de trabajo dentro del horno seran como maximo de 300 grados centigrados. Los resultados obtenidos serviran para caracterizar el uso y aprovechamiento de la energia solar y la caracterizacion de la camara de curado.

  5. Distribution electric system simulator to support decision-making for CFE (Federal Electric Commission) Distribution Control Centers; Simulador del Sistema Electrico de Distribucion para apoyo en la toma de decisiones en Centros de Control de Distribucion de la CFE

    Energy Technology Data Exchange (ETDEWEB)

    Espinosa Reza, Alfredo; Quintero Reyes, Agustin; Garcia Mendoza, Raul; Calleros Torres, Tito Manuel [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Borjas Diaz, Jesus Fidel; Sierra Rodriguez, Benjamin; Torres Abrego, Rafael [Comision Federal de Electricidad (Mexico)

    2011-07-01

    This article presents the physical, logical and functional architecture designed to integrate the Electric Distribution System (EDS) simulator developed for the CFE and the electric energy Distribution Control Centers in Mexico. The objective of the EDS simulator is to integrate engineering distribution functions (power flow, short circuit, optimal reconfiguration and reliability, among others) and an expert system (Case-based Reasoning) to aid the process of information analysis, decision-making and the capacity-building of the CFE's Regional and Zonal Distribution Control Centers. The EDS simulator has been installed, updated and is operational in the Tampico Zone and the Gulf Division Distribution Center, as an established product that continually evolves along with the actual operating dynamics. [Spanish] Se presenta la arquitectura fisica, logica y funcional disenada para integrar el simulador del Sistema Electrico de Distribucion (SED) desarrollado para la Comision Federal de Electricidad (CFE) y los Centros de Control de Distribucion de energia electrica en Mexico. El objetivo del simulador del SED es integrar funciones de ingenieria de distribucion (flujo de potencia, corto circuito, reconfiguracion optima, confiabilidad, entre otras) y un sistema experto (Razonamiento Basado en Casos) para apoyar el proceso de analisis de informacion, la toma de decisiones y la capacitacion en los Centros de Control de Distribucion Zonales y Regionales de CFE. El Simulador del SED se encuentra instalado, actualizado y en operacion en la Zona Tampico y en la Division de Distribucion Golfo Centro como un producto consolidado y en constante evolucion a la par de la dinamica operativa real.

  6. Adjustment of electrical equipment in the Akal-J oil platform of PEP for the implementation of the dehydration and desalting system of crude; Adecuacion de equipo electrico en la plataforma Akal-J de PEP para la implementacion del sistema de deshidratacion y desalado de crudo

    Energy Technology Data Exchange (ETDEWEB)

    Huesca Amador, Victor Hugo; Rosales Sedano, Inocente [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Coutino Gonzalez, Marina [PEMEX, Region Marina Noreste (Mexico)

    2010-10-09

    The Integral Asset Cantarell (AIC), of PEMEX Exploration and Production (PEP), developed a project to carry out the dehydration and desalting process of Maya (DDCM) crude of 300 MBD (thousands of daily barrels) of the Process Center (PC) of Akal-J through two integral systems of DDCM, with a capacity of 150 MBD each. The Process Center of Akal-J is conformed by eight marine platforms and the selected ones, by space availability to install these systems, were Akal-J2 and Akal-J3. In this paper the electrical analyses realized to determine the feasibility of the provision of energy to the required electrical equipment is presented, to implement the dehydration and desalting process of 300 MBD of Mayan crude, as well as the recommendations for a reliable and safe operation of the electrical system of the PC Akal-J. [Spanish] El Activo Integral Cantarell (AIC), de PEMEX Exploracion y Produccion (PEP), desarrollo un proyecto para efectuar el proceso de deshidratacion y desalado de crudo Maya (DDCM) de 300 MBD (miles de barriles diarios) de el Centro de Proceso (CP) Akal-J a traves de dos sistemas integrales de DDCM, con una capacidad de 150 MBD cada uno. El Centro de Proceso Akal-J se encuentra conformado por ocho plataformas marinas y las seleccionadas, por disponibilidad de espacio para instalar dichos sistemas, fueron Akal-J2 y Akal-J3. En este trabajo se presentan los analisis electricos realizados para determinar la factibilidad del suministro de energia a los equipos electricos requeridos, para implementar el proceso de deshidratacion y desalado de 300 MBD de crudo Maya, asi como las recomendaciones para una operacion confiable y segura del sistema electrico del CP Akal-J.

  7. Planning model for the expansion of the electrical generation system with risk demarcation criteria; Modelo para la planificacion de la expansion del sistema electrico de generacion con criterios de acotamiento de riesgo

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez Galicia, Julio Alberto; Nieva Gomez, Rolando [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2009-07-01

    The general characteristics of a planning model for the electrical generation system expansion with risk demarcation criteria, as well as the main results of a representative study case of the Mexican Electrical System is presented. The model is based on a methodology of multiannual optimization for the generation expansion plans determination. In this context, every expansion plan defines the technology type to be installed, as well as the installation year, unit size and its location within a regional electric network. For this purpose, the model considers an interregional representation of the system identifying the necessary reinforcements to the capacity of the interregional connections. It also incorporates a Demarcation of Risk module that considers the uncertainty of the future scenarios of fuels prices to generate a set of expansion plans, among which includes the following: a) For every future of the fuel prices: the plan that diminishes the present value of the total cost (investment plus production). b) The plan that diminishes the economic risk derived from the uncertainty in the future of the fuel prices. c) A subgroup of expansion plans that are located in the efficient borders of decision, under the context of three criteria of interest: the economic risk, the investment cost of and the total cost in the future considered of greater relevance. [Spanish] Se presentan las caracteristicas generales de un modelo de planificacion de la expansion del sistema electrico de generacion con criterios de acotamiento de riesgo, asi como los principales resultados de un caso de estudio representativo del Sistema Electrico Mexicano. El modelo se basa en una metodologia de optimacion multi-anual para la determinacion de planes de expansion de la generacion. En este contexto, cada plan de expansion define el tipo de tecnologia que debera instalarse, asi como el ano de instalacion, el tamano de la unidad y su localizacion dentro de una red electrica regional. Para

  8. Basic semantic architecture of interoperability for the intelligent distribution in the CFE electrical system; Arquitectura base de interoperabilidad semantica para el sistema electrico de distribucion inteligente en la CFE

    Energy Technology Data Exchange (ETDEWEB)

    Espinosa Reza, Alfredo; Garcia Mendoza, Raul; Borja Diaz, Jesus Fidel; Sierra Rodriguez, Benjamin [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2010-07-01

    entre sistemas y aplicaciones, sustentado en el Modelo de Informacion Comun (CIM por sus siglas en ingles), establecido en las normas IEC61968 e IEC 61970. Se muestra la arquitectura basada en SSOA (Semantic Services Oriented Architecture), en EIB (Entrerprise Integration Bus) y en GID (Generic Interface Definition), asi como la secuencia para lograr la interoperabilidad de sistemas relacionados con la Gestion de la Distribucion de energia electrica en Mexico. De igual manera se describe el proceso para establecer un Modelo Semantico del Sistema electrico de Distribucion (SED) y la creacion de instancias CIM/XML, orientadas a la interoperabilidad de los sistemas de informacion en el ambito DMS, mediante el intercambio de mensajes conformados y validados segun la estructura obtenida y acorde a las reglas establecidas por el Modelo CIM. De esta forma, los mensajes y la informacion que se intercambien entre sistemas, aseguran la compatibilidad y correcta interpretacion de manera independiente al desarrollador, marca o fabricante del sistema fuente y destino. El objetivo principal es establecer la infraestructura base de interoperabilidad semantica, basada en estandares que sustente la definicion estrategica de un Sistema Electrico de Distribucion Inteligente (SEDI) en Mexico.

  9. Design of very high speed electric generators;Diseno de generadores electricos de muy alta velocidad de giro

    Energy Technology Data Exchange (ETDEWEB)

    Labollita, Santiago [Universidad Nacional de Cuyo, Instituto Balseiro, Centro Atomico Bariloche (Argentina)

    2008-07-01

    This work approaches the design process of an electric generator suitable for running efficiently at high speed, driven by a turbo shaft.The axial flux concept was used.For the mechanical design of the prototype, cooling capacity and mounting method were considered, looking for simplicity of the parts evolved. Neodymium-iron-boron permanent magnets were used as magnetic source.For the electrical design, a calculation tool was developed in order to predict the prototype electrical parameters and optimize its geometry.The goal was to obtain 1 kW of electric power at a speed of 100,000 rpm.The efficiency and electrical behaviour of the prototype were characterized at speeds between 2,000 rpm and 30,000 rpm and then the behaviour at the design condition was predicted by obtaining an equivalent electric circuit.The estimated load voltage was 237 V as well as an electrical efficiency of 95%.Eddy current effects were not recognized. Increase of the internal resistance and decree of inductance were observed while raising the electric frequency.Finally, an electronic system was developed in order to use the prototype as a c.c. motor. Global performance was measured according to different supply characteristic. An optimum supply voltage was found.A maximum efficiency of 63% was reached.;El presente trabajo aborda el proceso de diseno de un generador electrico apto para funcionar eficientemente a alta velocidad, impulsado por un turboeje portatil. Se utilizo el concepto de flujo axial.En el diseno mecanico del prototipo se considero la capacidad de refrigeracion y la forma de montaje particular del conjunto, buscando la simplicidad de sus partes.Se utilizaron imanes permanentes de Neodimio-Hierro-Boro como fuente magnetica. Para el diseno electrico se genero una herramienta de calculo que permitio estimar los parametros electricos del prototipo y optimizar su geometria. Se busco obtener 1kW de potencia electrica a una velocidad de 100.000rpm.Se caracterizo el rendimiento y el

  10. MODELAMIENTO TÉRMICO Y VIBRATORIO DE UNA CÁPSULA PARA SENSORES DE FIBRA ÓPTICA ADAPTABLES A MEDICIONES EN SISTEMAS ELECTRICOS DE POTENCIA

    Directory of Open Access Journals (Sweden)

    MAURICIO AGUIAR

    2009-01-01

    Full Text Available En este trabajo se presenta un modelamiento térmico y vibratorio que permite diseñar cápsulas con alta conductividad térmica y aislamiento mecánico para sensores de temperatura basados en redes de Bragg en fibra óptica, con miras a su aplicación en sistemas eléctricos de potencia (SEP. Una de las variables de mayor relevancia en la operación de los componentes de un SEP es la temperatura, ya que su monitoreo en tiempo real permite predecir el estado del sistema y generar acciones de mantenimiento predictivo que garanticen la calidad y continuidad en el servicio. El modelado de la capsula dieléctrica se dividió en dos partes fundamentales: i un análisis mecánico mediante el método de elementos finitos para establecer la respuesta de la capsula ante vibraciones del orden de las reportadas en la literatura para generadores y transformadores de potencia; ii un análsis térmico, a través de un modelo analítico que permite establecer la velocidad de respuesta del sensor ante variaciones de temperatura. Los resultados encontrados muestran un gran potencial en el material que se propone para la fabricación de la capsula, el cual no se ha reportado en este tipo de aplicaciones.

  11. The use of the electric vehicle in the metropolitan area of Mexico city; Uso de vehiculos electricos en el area metropolitana de la ciudad de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Robles, G. [Centro de Intrumentos, UNAM, Mexico, D. F. (Mexico); Sheinbaum, C. [Instituto de Ingenieria, UNAM, Mexico, D. F. (Mexico)

    1997-12-31

    A study is performed on the impact that the introduction of the electric vehicle (EV) would have in the environmental pollution of the metropolitan area of Mexico City (MAMC) for different penetration scenarios of this technology and the costs of the electric vehicle is analyzed and compared with its counterpart, the gasoline vehicle. The associated emissions of a fleet formed of EV and internal combustion engine vehicles (ICEV) were determined and the emissions reduction of the contaminants considered in the period 1995-2010 produced was analyzed. It was found that the introduction of EV could importantly reduce the carbon monoxide, methane and carbon dioxide and marginally the nitrogen oxides. It was determined that if the EV is massively produced its total cost for its entire useful life would be comparable to the cost of the ICEV. [Espanol] Se realiza un estudio sobre el impacto que tendria la introduccion de vehiculos electricos (VE) en la contaminacion ambiental del area metropolitana de la ciudad de Mexico (AMCM) para diferentes escenarios de penetracion de esta tecnologia y se analiza el costo de los vehiculos electricos en comparacion con su contraparte de gasolina. Se determinaron las emisiones asociadas a una flota compuesta de VE y vehiculos con motor de combustion interna (VMCI) y se analizo la reduccion que producia en las emisiones de los diferentes contaminantes considerados en el periodo 1995-2010. Se encontro que la introduccion de VE podria reducir de manera importante las emisiones de monoxido de carbono, metano y dioxido de carbono y marginalmente las de oxido de nitrogeno. Se determino que si los VE son producidos masivamente su costo total para toda su vida util seria comparable al correspondiente al de los VMCI.

  12. The use of the electric vehicle in the metropolitan area of Mexico city; Uso de vehiculos electricos en el area metropolitana de la ciudad de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Robles, G [Centro de Intrumentos, UNAM, Mexico, D. F. (Mexico); Sheinbaum, C [Instituto de Ingenieria, UNAM, Mexico, D. F. (Mexico)

    1998-12-31

    A study is performed on the impact that the introduction of the electric vehicle (EV) would have in the environmental pollution of the metropolitan area of Mexico City (MAMC) for different penetration scenarios of this technology and the costs of the electric vehicle is analyzed and compared with its counterpart, the gasoline vehicle. The associated emissions of a fleet formed of EV and internal combustion engine vehicles (ICEV) were determined and the emissions reduction of the contaminants considered in the period 1995-2010 produced was analyzed. It was found that the introduction of EV could importantly reduce the carbon monoxide, methane and carbon dioxide and marginally the nitrogen oxides. It was determined that if the EV is massively produced its total cost for its entire useful life would be comparable to the cost of the ICEV. [Espanol] Se realiza un estudio sobre el impacto que tendria la introduccion de vehiculos electricos (VE) en la contaminacion ambiental del area metropolitana de la ciudad de Mexico (AMCM) para diferentes escenarios de penetracion de esta tecnologia y se analiza el costo de los vehiculos electricos en comparacion con su contraparte de gasolina. Se determinaron las emisiones asociadas a una flota compuesta de VE y vehiculos con motor de combustion interna (VMCI) y se analizo la reduccion que producia en las emisiones de los diferentes contaminantes considerados en el periodo 1995-2010. Se encontro que la introduccion de VE podria reducir de manera importante las emisiones de monoxido de carbono, metano y dioxido de carbono y marginalmente las de oxido de nitrogeno. Se determino que si los VE son producidos masivamente su costo total para toda su vida util seria comparable al correspondiente al de los VMCI.

  13. Technical-economic study of energy efficiency in offshore industrial electrical systems; Estudio tecnico economico de eficiencia energetica en sistemas electricos industriales costa afuera

    Energy Technology Data Exchange (ETDEWEB)

    Fiscal Escalante, Raul [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2001-07-01

    In this work the methodology of analysis and the results obtained are presented in an technical-economic study for the application of power efficiency measures for a marine platform. The methodology is considered in the following steps: 1) Technical evaluation of the installation 2) Technical analyses of the optimization alternatives 3) Economic evaluation of the selected optimization alternatives graphs of the thermal regime of the variation with respect to the generation, variation of the efficiency with respect to the generation, efficiency curve of the motor and the designed curve of the pump are presented. A table of general reference parameters and another one of particular reference is given. Also a table of the economic evaluation when changing the electrical motor by one more efficient is presented. It is concluded that a potential of energy saving exists in their processes, generating an opportunity to perform a technical-economic feasibility study in these facilities. [Spanish] En este trabajo se presenta la metodologia de analisis y los resultados obtenidos en un estudio tecnico-economico para la aplicacion de medidas de eficiencia energetica para una plataforma marina. Se plantea la metodologia en los siguientes pasos: 1) Evaluacion tecnica de la instalacion 2) Analisis tecnico de las alternativas de optimizacion 3) Evaluacion economica de las alternativas de optimizacion seleccionadas. Se muestran graficas de la variacion del regimen termico respecto a la generacion, variacion de la eficiencia respecto a la generacion, curva de eficiencia del motor y curva de diseno de la bomba. Se da una tabla de parametros de referencia generales y otra de referencia particulares. Tambien se presenta una tabla de la evaluacion economica al cambiar el motor electrico por uno mas eficiente. Se concluye que existe un potencial de ahorro de energia en sus procesos, generando una oportunidad para realizar estudios de factibilidad tecnica economica en dichas instalaciones.

  14. Oportunidades do ambiente domiciliar para o desenvolvimento motor Oportunidades del ambiente domiciliar para el desarrollo motor Opportunities in the home environment for motor development

    Directory of Open Access Journals (Sweden)

    Érica Cesário Defilipo

    2012-08-01

    Full Text Available OBJETIVO: Avaliar as oportunidades presentes no ambiente domiciliar para o desenvolvimento motor de lactentes. MÉTODOS: Estudo epidemiológico de base populacional, transversal, realizado com 239 lactentes com idade entre três e 18 meses, residentes no município de Juiz de Fora, MG, em 2010. Os participantes foram selecionados por amostragem aleatória estratificada, conglomerada, em múltiplos estágios. Para avaliar a qualidade e quantidade de estímulo motor no ambiente domiciliar foi utilizado o instrumento Affordance in the Home Environment for Motor Development - Infant Scale. Procedeu-se a análise bivariada com aplicação do teste qui-quadrado, seguida de regressão logística multinomial para verificar a associação entre as oportunidades presentes no domicílio e fatores biológicos, comportamentais, demográficos e socioeconômicos. RESULTADOS: As oportunidades de estimulação ambiental foram relativamente baixas. Na análise bivariada, para a faixa etária de três a nove meses, foi encontrada associação com os fatores: ordem de nascimento (p = 0,06, classificação socioeconômica (p = 0,08, renda mensal (p = 0,06 e renda per capita (p = 0,03. No modelo de regressão, prevaleceu a classificação socioeconômica (RC = 7,46; p = 0,03. Para a faixa etária de dez a 18 meses, os fatores associados, na análise bivariada, foram: estado civil materno (p OBJETIVO: Evaluar las oportunidades presentes en el ambiente domiciliar para el desarrollo motor de lactantes. MÉTODOS: Estudio epidemiológico de base poblacional, transversal, realizado con 239 lactantes con edad entre tres y 18 meses, residentes en el municipio de Juiz de Fora, Sureste de Brasil, en 2010. Los participantes se seleccionaron por muestreo aleatorio estratificado, conglomerado, en múltiples fases. Para evaluar la calidad y cantidad de estimulo motor en el ambiente domiciliar se utilizó el instrumento Affordance in the Home Environment for Motor Development

  15. Computer electric design of synchronous generators; Diseno electrico de generadores sincronos por computadora

    Energy Technology Data Exchange (ETDEWEB)

    Patlan Frausto, Jose O; Acosta Aradillas, Juan [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1987-12-31

    In this article are presented, in a conceptual manner the main elements that participate in the electric design of synchronous generators. Also, other options are presented for computers utilization as a design support. Afterwards, a computer program developed by the Instituto de Investigaciones Electricas (IIE) for the electric design of projecting poles generators is presented, oriented towards obtaining their electro-magnetic dimensioning. Finally, with the purpose of validating this program, the results obtained in a specific case, are presented. [Espanol] En este articulo se presentan, de manera conceptual, los principales elementos que participan en el proceso de diseno electrico de generadores sincronos. Tambien se plantean otras opciones para utilizar las computadoras como apoyo de diseno. Posteriormente, se describe un programa de computo desarrollado en el Instituto de Investigaciones Electricas (IIE) para el diseno electrico de generadores de polos salientes, orientado a obtener su dimensionamiento electromagnetico. Por ultimo, con el proposito de validar este programa, se presentan los resultados obtenidos en un caso particular.

  16. Computer electric design of synchronous generators; Diseno electrico de generadores sincronos por computadora

    Energy Technology Data Exchange (ETDEWEB)

    Patlan Frausto, Jose O.; Acosta Aradillas, Juan [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1986-12-31

    In this article are presented, in a conceptual manner the main elements that participate in the electric design of synchronous generators. Also, other options are presented for computers utilization as a design support. Afterwards, a computer program developed by the Instituto de Investigaciones Electricas (IIE) for the electric design of projecting poles generators is presented, oriented towards obtaining their electro-magnetic dimensioning. Finally, with the purpose of validating this program, the results obtained in a specific case, are presented. [Espanol] En este articulo se presentan, de manera conceptual, los principales elementos que participan en el proceso de diseno electrico de generadores sincronos. Tambien se plantean otras opciones para utilizar las computadoras como apoyo de diseno. Posteriormente, se describe un programa de computo desarrollado en el Instituto de Investigaciones Electricas (IIE) para el diseno electrico de generadores de polos salientes, orientado a obtener su dimensionamiento electromagnetico. Por ultimo, con el proposito de validar este programa, se presentan los resultados obtenidos en un caso particular.

  17. Recommendations for the use of high efficiency motors; Recomendaciones para la utilizacion de motores de alta eficiencia

    Energy Technology Data Exchange (ETDEWEB)

    Buitron Sanchez, Horacio [Comision Federal de Electricidad, Mexico, D. F. (Mexico)

    1994-12-31

    In this paper the most important characteristics of the high efficiency motors are examined and the use of these motors as an alternative for the saving and efficient use of the electrical energy is proposed. The operating cost is analyzed in relation with similar standard motors and several suggestions that can help to justify its application are given. [Espanol] En este trabajo se examinan las caracteristicas relevantes de los motores de alta eficiencia y se plantea su utilizacion como alternativa para el ahorro y uso eficiente de la energia electrica. Se analiza su costo de operacion, en relacion con motores estandar similares y se dan varias sugerencias que pueden ayudar a justificar su aplicacion.

  18. Recommendations for the use of high efficiency motors; Recomendaciones para la utilizacion de motores de alta eficiencia

    Energy Technology Data Exchange (ETDEWEB)

    Buitron Sanchez, Horacio [Comision Federal de Electricidad, Mexico, D. F. (Mexico)

    1993-12-31

    In this paper the most important characteristics of the high efficiency motors are examined and the use of these motors as an alternative for the saving and efficient use of the electrical energy is proposed. The operating cost is analyzed in relation with similar standard motors and several suggestions that can help to justify its application are given. [Espanol] En este trabajo se examinan las caracteristicas relevantes de los motores de alta eficiencia y se plantea su utilizacion como alternativa para el ahorro y uso eficiente de la energia electrica. Se analiza su costo de operacion, en relacion con motores estandar similares y se dan varias sugerencias que pueden ayudar a justificar su aplicacion.

  19. Expansion plan of the electrical sector; Plan de expansion del sector electrico

    Energy Technology Data Exchange (ETDEWEB)

    Cristerna Ocampo, Rafael [Comision Federal de Electricidad (Mexico)

    1996-07-01

    An analysis of the Mexican electrical market in the year 1994 as far as sales of electrical energy and types of users who utilized that energy, is presented. In addition, an analysis is made of the options for the future supply, where the installed electrical capacity in Mexico in 1994 is described. Also the requirements of additional capacity of power generation, from year 1995 to year 2004 are analyzed. In the internal supply of primary energy in Mexico, the hydrocarbons represent 83%, the diversified sources (nuclear, geothermal, hydro and coal) represent 7% and the biomass as well as complementary coal, the 10% balance of the primary energy. Finally an expansion plan of the transmission network of the Mexican electrical system is described. [Spanish] Se presenta un analisis del mercado electrico mexicano en el ano de 1994 en cuanto a ventas de energia electrica y los tipos de usuarios que utilizaron esa energia. Se hace un analisis ademas, de las opciones para la oferta futura, donde se describe la capacidad electrica instalada de Mexico en 1994. Tambien se analizan los requerimientos de capacidad adicional de generacion de 1995 al 2004. En la oferta interna de energia primaria en Mexico, los hidrocarburos representan el 83%, las fuentes diversificadas (nuclear, geotermia, hidro y carboelectrica) representan el 7% y la biomasa asi como el carbon complementario, el 10% restante de la energia primaria. Finalmente se describe un plan de expansion de la red de transmision del sistema electrico mexicano.

  20. Revision of the standards in the application of high efficiency induction motors; Revision de la normatividad en la aplicacionon de motores, de induccion, de eficiencia alta

    Energy Technology Data Exchange (ETDEWEB)

    Acoltzi Acoltzi, Higinio [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2001-07-01

    In this work the elements contained in the national and international standards to obtain the benefits in the application of high efficiency electrical motors are presented. A table of associated normal and minimum efficiency is presented, and one with values of nominal efficiency at full load for totally enclosed motors of standard efficiency, for opened motors of standard efficiency and high efficiency. Graphs are given where the comparison of nominal efficiencies is shown for AC induction motors to closed and opened poles. [Spanish] En este trabajo se presentan los elementos contenidos en las normas nacionales e internacionales para conseguir los beneficios en la aplicacion de motores electricos de eficiencia alta. Se muestra una tabla de eficiencia normal y minima asociados, y una con valores de eficiencia nominal a plena carga para motores cerrados de eficiencia estandar, para motores abiertos de eficiencia estandar y de eficiencia alta. Se da graficas donde se muestra la comparacion de eficiencias nominales, para motores de CA de induccion, a polos cerrados y a polos abiertos.

  1. Cálculo de un sistema de inyección multifuel para motores Diesel

    OpenAIRE

    PAVÍA PARRA, MARC

    2015-01-01

    [ES] Los nuevos diseños de motores buscan como estrategia la combinación de propiedades de los combustibles Diesel y gasolina convencionales, por sus ventajas en cuanto a rendimiento y emisiones. El presente proyecto calculará el impacto que estos cambios pueden tener sobre la mezcla combustible-aire, y cómo se quema el combustible en el motor. Para ello se empleará un código de cálculo 1D de chorros, en el cual se definen las condiciones de contorno en el cilindro del motor y se puede predec...

  2. Steady state analysis and Eastern power system dynamic PDVSA EyP considering incorporating Furrial and PIGAP II generation plants; Analisis en regimen permanente y dinamico del sistema electrico de PDVSA EyP Oriente considerando la incorporacion de las plantas de generacion Furrial y PIGAP II

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez, S [Universidad Nacional Experimental Politecnica, Antonio Jose de Sucre, Guayana, Bolivar (Venezuela)]. E-mail: sergiodrg200@gmail.com; Vasquez, C [Petroleos de Venezuela S.A., Maturin, Monagas (Venezuela)]. E-mail: vasquezcp@pdvsa.com

    2013-03-15

    This paper is focused on steady state and dynamic analysis of Eastern Power System of Petroleum of Venezuela S.A. (PDVSA) Exploration and Production, considering new single cycle gas turbine power plants in Punta de Mata and El Furrial operational areas that will start up in 2015. Network operating conditions were determined, specifically the behavior of power flows and voltage profiles in normal condition of operation and under Contingencies N-1 in PDVSA Power System, as well as the short-circuit levels at all buses of the transmission network. Afterward, it was evaluated the impact on the network caused by the starting of the biggest motor in the system, considering island operation, verifying that it's necessary to maintain the interconnection with the National Electric System. For motor starting study, machine dynamic model was determined by mean of parameters estimation of its equivalent circuit, as well as the application of nonlinear regression methods in order to obtain load model using the information supplied by the manufacturer. [Spanish] El presente trabajo esta enfocado al analisis del comportamiento en regimen permanente y dinamico del sistema electrico de Petroleos de Venezuela S.A. (PDVSA) Exploracion y Produccion Oriente, considerando la incorporacion de nuevas Plantas de Generacion Termoelectricas de Ciclo Simple a Gas que entraran en operacion en las areas operacionales de Punta de Mata y El Furrial para el ano 2015. Se determinaron las condiciones de operacion de la red, especificamente el comportamiento de los flujos de potencia y perfiles de voltaje en Condicion Normal de operacion y bajo Contingencias N-1 dentro del Sistema de PDVSA, asi como el incremento en los niveles de cortocircuito en todas las barras de la red de transmision. Luego se evaluo el impacto en la red originado por el arranque del motor de mayor capacidad considerando la posible operacion en isla del sistema, determinandose que es necesario operar interconectado con el

  3. Optimización de Estatores para Motores Superconductores de Flujo Axial Optimización de Estatores para Motores Superconductores de Flujo Axial

    Directory of Open Access Journals (Sweden)

    Oscar Gerardo Ibarra-Manzano

    2012-02-01

    Full Text Available The development of superconducting electrical machines has been designed primarily to design and build engines with the superconducting magnetic field in radial configuration, as traditional engines, so the design and construction of rotating electrical machines in axial flow configuration has become an alternative for the design and construction of such engines. In this paper we present preliminary calculations for the optimization of the stator of a superconducting motor in axial flow confi guration, based on the equations of general power of the rotary axial flow configuration. It performs the construction, optimization and evaluation of models of stators in geometries of 4, 6 and 8 poles with high-temperature superconducting tapes of Bismuth. The results show the feasibility of the design implemented, which is verified by a significant decrease in the current of superconducting motor operation.El desarrollo de máquinas eléctricas superconductoras ha estado encaminado principalmentea diseñar y construir motores superconductores con el campo magnético en configuración radial, como los motores tradicionales, por lo que el diseño y construcción demáquinas eléctricas rotativas en configuración de flujo axial ha venido a ser una alternativa para el diseño y construcción de este tipo de motores. En el presente trabajo se presentan los cálculos preliminares para la optimización del estator de un motor superconductor en configuración de flujo axial, basados en las ecuaciones generales de potencia de las máquinas eléctricas rotativas en configuración flujo axial ha venido a ser una alternativa para el diseño y construcción, optimización y evaluación de modelos de estatores en geometrías de 4, 6 y 8 polos, con cintas superconductoras de alta temperatura de Bismuto. Los resultados obtenidos muestran la viabilidaddel diseño implementado, lo cual se comprueba por medio de una disminución significativa de la corriente de operaci

  4. Reasoning based in cases applied to diagnosis of electric generators; Razonamiento basado en casos aplicado al diagnostico de generadores electricos

    Energy Technology Data Exchange (ETDEWEB)

    De la Torre Vega, H. Octavio; Garcia Tevillo, Arturo; Campuzano Martinez, Roberto [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico); Lopez Azamar, Ernesto [Comision Federal de Electricidad (Mexico)

    2000-07-01

    The development of a system for the diagnosis of electrical generators that apply techniques of artificial intelligence, is presented, as it is the reasoning based on cases, to support the work of the diagnosis engineer. This system is part of a system called CADIS, dedicated to the diagnosis of electrical generators out of line and reason of previous articles. In this occasion the characteristics of the reasoning module based on experiences (SirBE) are emphasized, indicating how to make a diagnosis using similar cases and how to edit the system base of experience, using the interactive editor of cases. It is included, in addition, a summarized example which represents a case for SirBE and how the system helps to make a diagnosis. [Spanish] Se presenta el desarrollo de un sistema de diagnostico de generadores electricos que aplica tecnicas de inteligencia artificial, como es el razonamiento basado en casos, para apoyar la labor del ingeniero de diagnostico. Este sistema es parte de un sistema denominado CADIS, dedicado al diagnostico de generadores electricos fuera de linea y motivo de articulos anteriores. En esta ocasion se resaltan las caracteristicas del modulo de razonamiento basado en experiencias (SirBE), indicando como realizar un diagnostico utilizando casos similares y como editar la base de experiencia del sistema utilizando el editor interactivo de casos. Se incluye, ademas, un ejemplo resumido de lo que representa un caso para SiRBE y como el sistema ayuda a realizar un diagnostico.

  5. Development program of electrical vehicles of batteries in the UNAM; Programa de desarrollo de vehiculos electricos de baterias en la UNAM

    Energy Technology Data Exchange (ETDEWEB)

    Carmona Paredes, G.; Chicurel Uziel, R.; Chicurel Uziel, E.; Gutierrez Martinez, F. [Instituto de Ingenieria, UNAM, Mexico, D.F. (Mexico)

    2002-09-01

    Eight years ago, project to develop a small battery powered electric bus, known today as UNAM's Electric Vehicle, was started at the Engineering Institute. This project was followed by the design and construction, under an agreement with the Mexico City Government, of the Electrobus, a public transport vehicle that was recently put in operation and is being evaluated by the City's Electric Transportation Service. Two other projects, within the scope of UNAM's Electric Vehicle Development Program refer to light trucks: the Electrovira, characterized by exceptional maneuverability, and the Electric Delivery Vehicle. These projects are being carried out respectively by the Engineering Institute and the School of Engineering's Center for Design and Manufacture. Other parties that have collaborated in the program are: the School of Architecture's Center for Research in Industrial Design, the Instruments Center, and the School of Chemistry. Work is also being done on complementary aspects which include the development of an intelligent charger for large battery packs and of a dual electronic controller, a study of the dynamic performance of lead-acid batteries, the design of a battery monitoring system, and the search for new battery alternatives. [Spanish] Hace ocho anos, el Instituto de Ingenieria inicio el proyecto de desarrollo de un minibus electrico de baterias, conocido ahora como el Vehiculo Electrico UNAM. Este proyecto fue seguido de un convenio con el Gobierno del Distrito Federal para el diseno y construccion del Electrobus, un vehiculo para transporte publico que recientemente fue puesto en operacion para ser evaluado por el Servicio de Transporte Electrico del DF. Dos proyectos mas, enmarcados dentro del Programa de Desarrollo de Vehiculos Electricos, se refieren a vehiculos ligeros de carga como el Electrovira, caracterizado por su gran maniobrabilidad y el Vehiculo Electrico de Reparto. Estos proyectos se realizan respectivamente

  6. Algoritmo PSO para identificación de parámetros en un motor DC

    Directory of Open Access Journals (Sweden)

    César Duarte

    2010-01-01

    Full Text Available En este artículo se presenta la aplicación del algoritmo Particle Swarm Optimization (PSO como estrategia de búsqueda para determinar los parámetros de un sistema tipo caja gris. Este proceso de identificación se ilustra utilizando la respuesta a un escalón de un motor DC en lazo abierto. Para agilizar la identificación del sistema a través del uso de PSO, se limita el espacio de búsqueda usando la información que puede extraerse de la respuesta en el dominio del tiempo del sistema a identificar. Los resultados del proceso de identificación de los parámetros del motor se obtienen utilizando la herramienta PSOt disponible para entorno Matlab® desarrollada por Brian Birge.

  7. Recognition of faults patterns in electric generators using artificial neurons networks; Reconocimiento de patrones de fallas en generadores electricos empleando redes neuronales artificiales

    Energy Technology Data Exchange (ETDEWEB)

    Rocha Sanchez, Martha Alicia

    1999-03-01

    This work present the development of a reprocessing method to reduce the information of the original data and to maintain the essential information of the data that enter the reduction process. The obtaining of these data is performed with the aid of the ICM ++ (ICMsystems), from which vectors or n-uplos of elements are obtained. This investigation allowed to analyze an evaluation of the paradigms of artificial neural networks, with the intention of detecting which of these paradigms would evolve better with the problem of fault diagnosis in electric generators. From this a prototype system was developed called diagnosis of faults in electrical generators, which automatically will recognize faults in electrical generators by means of the interpretation of the recording of partial discharges. [Spanish] El presente trabajo presenta el desarrollo de un metodo de reprocesamiento para reducir informacion de los datos originales y mantener la informacion esencial de los datos que entran al proceso de reduccion. La obtencion de estos datos se realiza con la ayuda del ICM ++ (ICMsystems), de los cuales se obtienen vectores o n-uplos de elementos. Esta investigacion permitio analizar una evaluacion de los paradigmas de redes neuronales artificiales, con el objeto de detectar cual de estos paradigmas se desempenaria mejor con el problema de diagnostico de fallas en generadores electricos. A partir de esto se desarrollo un sistema prototipo llamado diagnostico de fallas en generadores electricos, el cual automaticamente reconocera fallas en los generadores electricos mediante la interpretacion de registro de descargas parciales.

  8. Electricity sector prospective 2009-2024; Prospectiva del sector electrico 2009-2024

    Energy Technology Data Exchange (ETDEWEB)

    Irastorza Trejo, Veronica; Doniz Gonzalez; Virginia; Cue Aguilar; Gumersindo [Secretaria de Energia, Mexico, D.F. (Mexico)

    2009-07-01

    , las fuentes de energia primaria y secundaria que se utilizan para generar electricidad en varios paises y regiones, las proyecciones del consumo de combustibles, asi como la dinamica en la construccion de nuevas centrales e infraestructura mediante tecnologia de punta que, tanto en las economias avanzadas como en las emergentes, representan tendencias estrategicas en el contexto del combate global al cambio climatico, entre las que destacan la tecnologia de los nuevos reactores nucleares avanzados y las tecnologias aplicables al aprovechamiento de las fuentes renovables como la eolica, solar, geotermica, mini hidraulica, y bioenergeticas, entre otras. En el segundo capitulo se presenta la estructura del marco legal y regulatorio del sector electrico, asi como los instrumentos de politica regulatoria aplicables en Mexico y el estado que guardan los permisos otorgados en las modalidades consideradas en la Ley del Servicio Publico de Energia Electrica. En el tercer capitulo se analiza la evolucion del mercado electrico nacional de los ultimos anos, considerando el comportamiento del consumo nacional de electricidad, las ventas para el servicio publico y sector, el comportamiento estacional de la demanda y la estructura tarifaria. En el cuarto capitulo se presenta la trayectoria de planeacion del consumo y la demanda de electricidad a nivel nacional, sectorial y regional con el proposito de identificar los requerimientos de capacidad y de energia necesaria para el periodo 2009-2024.

  9. Diseño preliminar de un rotor de onda para motores con microturbina

    Directory of Open Access Journals (Sweden)

    Gina P. Pérez B.

    2009-01-01

    Full Text Available Este trabajo presenta un analisis preliminar sobre los beneficios de ia implementacion de un rotor de onda en una micro-turbina convencional. Este estudio se enfoca en la consecución de un punto de disefio por medio de cálculos térmicos para así lograr una geometría adecuada, la cual podra ser evaluada por medio de Dinámica de Flujo Computacional CFD para determinar la viabilidad de la implementacion de este dispositive en un motor con micro-turbina a gas de 30 lb, de empuje.

  10. Asymptotic energies and sustainable electrical development; Energias asintoticas y desarrollo electrico sustentable

    Energy Technology Data Exchange (ETDEWEB)

    Velez O, Carlos [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2003-07-01

    A review is made of the energy resources in use existing at the moment for the electricity production (hydraulic, coal, oil, gas and uranium). The asymptotic energies (solar, geothermal and nuclear fission and fusion) are described and the state of development in which they are up to the moment. One concludes that in the case of Mexico it would be convenient to make flexible and to reinforce the electrical systems in forecast of a greater participation of the distributed generation and to orient the extensions of the electrical generation to make a greater use of the three asymptotic energies already used: the solar (in its forms hydraulic and wind power), geothermal and the nuclear fission. [Spanish] Se pasa revista a los recursos existentes en las energias actualmente en uso para la produccion de electricidad (hidraulica, carbon, petroleo, gas y uranio). Se describen las energias asintoticas (solar, geotermia y fision y fusion nucleares) y el estado de desarrollo en que se encuentran hasta el momento. Se concluye que en el caso de Mexico convendria flexibilizar y reforzar el sistema electrico en prevision de una mayor participacion de la generacion distribuida y orientar las ampliaciones de la generacion electrica para hacer un mayor uso de tres de las energias asintoticas ya utilizadas: la solar (en sus formas hidraulica y eolica), la geotermia y la fision nuclear.

  11. Estratégias para o desenvolvimento motor, intelectual e social para beneficiários de APAES

    Directory of Open Access Journals (Sweden)

    Byanca Eugênia Duarte Silva

    2016-09-01

    Full Text Available A APAE é uma entidade filantrópica que desenvolve atividades de sensibilização, conscientização, prevenção, habilitação, reabilitação e inserção no mercado de trabalho. Dentro dessa perspectiva as atividades lúdicas são recurso pedagógico bastante importante, uma vez que além desenvolver as regras de comportamento pode desenvolver sua coordenação motora, suas habilidades visuais e auditivas, e seu raciocínio criativo e cognitivo.  Logo, o estudo objetivou evidenciar a importância das atividades lúdicas pedagógicas para o desenvolvimento da pessoa com deficiência, apresentando sugestões que propiciam este desenvolvimento em diferentes esferas. O presente estudo trata-se de um relato de experiência a partir do estágio realizado na Associação de Pais e Amigos dos Excepcionais (APAE da cidade de Cajazeiras-PB, em detrimento de um trabalho psicoterapêutico realizado com cinco adolescentes beneficiários, no período de outubro à novembro de 2015. Para este trabalho psicoterapêutico utilizou-se da sugestão de 10 atividades lúdicas pedagógicas que trabalham aspectos motores, cognitivos e sociais dos beneficiários. Este leque de atividades mostra as várias formas de possibilidades para que a pessoa com deficiência aperfeiçoe e/ou desenvolva sua capacidade intelectual, motora e social. Como também aumente sua apropriação do real através do simbólico, que são os objetos. Portanto as atividades lúdicas pedagógicas é um valioso recurso para impulsionar o desenvolvimento das pessoas com deficiência.Strategies for motor development, intellectual and social for beneficiaries of APAESAbstract: APAE is a philanthropic organization that develops awareness activities, awareness, prevention, habilitation, rehabilitation and integration into the labor market. Within this perspective the play activities are very important educational resource, as well develop the rules of behavior can develop their motor skills

  12. El biodiesel de aceite de higuerilla como combustible alternativo para motores diesel

    Directory of Open Access Journals (Sweden)

    ALIRIO BENAVIDES

    2007-01-01

    Full Text Available En este artículo se presenta un estudio experimental sobre la producción y utilización del biodiesel de aceite de higuerilla. El máximo rendimiento de metilésteres en la reacción de transesterificación del aceite de higuerilla usado se obtiene bajo las siguientes condiciones: temperatura ambiente, una relación molar metanol/aceite de 9 y una concentración de catalizador de 0.8%. El biodiesel de aceite de higuerilla puede ser mezclado con el combustible diesel convencional derivado del petróleo en proporciones hasta del 15%, sin que la mezcla resultante se salga de las especificaciones de calidad estipuladas en los estándares nacionales e internacionales para combustibles diesel. La mayor dificultad para el uso del biodiesel de aceite de higuerilla en motores es su alta viscosidad. Sin embargo este biocombustible presenta excelentes propiedades de flujo a baja temperatura (valores bajos para los puntos de nube y fluidez. Las pruebas en motor con mezclas biodiesel de higuerilla/diesel convencional, en el rango de proporciones de biodiesel ensayadas, muestran que ha medida que se incrementa la proporción de biodiesel en la mezcla aumenta el consumo específico de combustible, disminuye el dosado relativo, la opacidad de humos se disminuye levemente, mientras que el rendimiento efectivo y las emisiones de CO y CO2 prácticamente permanecen constantes

  13. Measurement of harmonics in electrical power systems; Medicion de armonicas en sistemas electricos

    Energy Technology Data Exchange (ETDEWEB)

    Calderon Gonzalez, Gustavo Adolfo

    1998-07-01

    un sistema para la cuantificacion y estudio del contenido de armonicas en sistemas electricos. El estudio esta enfocado a senales de corriente de alimentacion de un horno de Arco Largo. El sistema desarrollado para la cuantificacion del contenido de armonicas esta formado por las siguientes partes: (a) Sistemas de adquisicion de datos: La aplicacion de un sistema de adquisicion de datos nos posibilita tomar muestras de una senal analoga de voltaje. Las muestras adquiridas que representan una senal analoga, pueden ser procesadas posteriormente en una computadora digital. El sistema de adquisicion de datos esta constituido por: Una microcomputadora IBM-PC, una tarjeta de digitalizacion de senales analogas y programacion para realizar el muestreo de las senales. (b) Procesamiento digital de senales adquiridas: Con el proposito de determinar el contenido armonico, se utilizo el metodo de la Transformada Rapida de fourier. El analisis mediante la Transformada Rapida de Fourier nos permite obtener el espectro de las senales en el dominio de la frecuencia. Mediante el analisis por medio de la transformada rapida de Fourier se tiene una disminucion sustancial en el tiempo de computo de los coeficientes correspondientes a las armonicas, esto comparado con el metodo de series discretas de Fourier. (c) Analisis de resultados obtenidos: Se realizaron varias mediciones de senales de corriente de linea y banco de capacitores del sistema de alimentacion de un horno de arco. Para cada medicion realizada se obtuvo la magnitud y la fase para cara armonica. Del conjunto de magnitudes y fases de los coeficientes, se calculo el valor promedio y su desviacion estandar. Se muestran graficas de la variacion de la magnitud y la fase de cada armonica con el tiempo. Asimismo, se tienen graficas de las formas de onda de la senal en analisis, diagramas de barras del contenido espectral promedio y un reporte de la desviacion estandar de la magnitud y la fase para cada armonica. Se incluyen

  14. Diagnosis on line and off line of induction motors of low, medium and high voltage; Diagnostico en linea y fuera de linea de motores de induccion de baja, mediana y alta tension

    Energy Technology Data Exchange (ETDEWEB)

    Carvajal, Francisco Antonio; Ramirez, Jose Manuel; Arcos, Luis Fernando [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    1999-07-01

    The induction motors of low, medium and high voltage are the electrical equipment of greatest application in industry. The importance which they have in the different productive processes does necessary to assure its operative continuity. The anticipated detection of a possible cause of fault allows to plan, with maintenance aims, the programmed removal of the motor. In this article are presented the results of the activities nowadays performed by Management of Electrical Equipment of the Instituto de Investigaciones Electricas (IIE) for the development and application of online diagnosis techniques for induction motors up to 13.8 kV. [Spanish] Los motores de induccion de baja, mediana y alta tension son los equipos eletricos de mayor aplicacion en la industria. La importancia que tienen en los diferentes procesos productivos hace necesario asegurar su continuidad operativa. La deteccion anticipada de una posible causa de falla permite planear, con fines de mantenimiento, la remocion programada del motor. En este articulo se presentan los resultados de las actividades que realiza actualmente la Gerencia de equipos Electricos del Instituto de investigaciones Electricas (IIE) para el desarrollo y la aplicacion de tecnicas de diagnostico en linea para motores de induccion de hasta 13.8 kV.

  15. Automated control of electronic equipment in intelligent buildings; Control automatizado de equipo electrico en edificios inteligentes

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez Vera, Jorge [Electrica Integral, S. A. de C. V., Mexico, D. F. (Mexico)

    1994-12-31

    esta reservada a la nacion a traves de Comision Federal de Electricidad (CFE). La cual es un organismo descentralizado del Gobierno Federal y por ende, sujeta entre muchas otras a la Ley de Presupuesto, Contabilidad y Gasto Publico. Quienes conocemos CFE sabemos de la gran dificultad, siempre creciente, de allegarse recursos para financiar sus obras de infraestructura, entre las que podemos citar: centrales electricas, subestaciones, lineas de transmision y redes de distribucion. Por lo anterior, los programas de ahorro y conservacion de la energia representan para el sector electrico nacional la posibilidad de diferir las inversiones requeridas para garantizar la oferta de energia. Por otra parte, a los usuarios del servicio publico de energia, el instituir dentro de sus politicas operativas programas de ahorro y conservacion de la energia, indudablemente les redundara en beneficios economicos y se mejorara el indice de kWh/Unidad de producto terminado. Finalmente, en un pais como el nuestro en donde el 66% de la energia generada por el sector electrico nacional proviene de centrales termoelectricas que usan para su operacion combustibles fosiles, la implementacion generalizada de programas de ahorro de energia disminuira la necesidad de generar kWh, y en consecuencia, la emision de contaminantes agresivos al medio ambiente tales como oxidos de nitrogeno y de azufre, bioxido de carbono y particulas suspendidas.

  16. Automated control of electronic equipment in intelligent buildings; Control automatizado de equipo electrico en edificios inteligentes

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez Vera, Jorge [Electrica Integral, S. A. de C. V., Mexico, D. F. (Mexico)

    1993-12-31

    esta reservada a la nacion a traves de Comision Federal de Electricidad (CFE). La cual es un organismo descentralizado del Gobierno Federal y por ende, sujeta entre muchas otras a la Ley de Presupuesto, Contabilidad y Gasto Publico. Quienes conocemos CFE sabemos de la gran dificultad, siempre creciente, de allegarse recursos para financiar sus obras de infraestructura, entre las que podemos citar: centrales electricas, subestaciones, lineas de transmision y redes de distribucion. Por lo anterior, los programas de ahorro y conservacion de la energia representan para el sector electrico nacional la posibilidad de diferir las inversiones requeridas para garantizar la oferta de energia. Por otra parte, a los usuarios del servicio publico de energia, el instituir dentro de sus politicas operativas programas de ahorro y conservacion de la energia, indudablemente les redundara en beneficios economicos y se mejorara el indice de kWh/Unidad de producto terminado. Finalmente, en un pais como el nuestro en donde el 66% de la energia generada por el sector electrico nacional proviene de centrales termoelectricas que usan para su operacion combustibles fosiles, la implementacion generalizada de programas de ahorro de energia disminuira la necesidad de generar kWh, y en consecuencia, la emision de contaminantes agresivos al medio ambiente tales como oxidos de nitrogeno y de azufre, bioxido de carbono y particulas suspendidas.

  17. Modal analysis of electromechanical oscillations in electrical power systems; Analisis modal de oscilaciones electromecanicas en sistemas electricos de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Calderon-Guizar, J.G [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: jgcg@iie.org.mx

    2008-10-15

    The presence of electromechanical oscillations in any electrical power system is a typical characteristic of this kind of systems. Provided the damping associated with these oscillations lies above of a minimum specified value, the occurrence of these oscillations is not considered as a threat to the system operation. This paper focuses the attention on the application of modal analysis for assessing the dynamical behavior of a power system subjected to small disturbances for different operating conditions and transmission system topologies, as well. The reported results indicate, that modal analysis enables a straight identification of the causes that contribute negatively to the damping of the electromechanical modes. [Spanish] La presencia de oscilaciones electromecanicas en cualquier Sistema Electrico de Potencia (SEP) es una caracteristica propia de estos sistemas. Mientras el amortiguamiento asociado con este tipo de oscilaciones se encuentre dentro de los limites considerados como aceptables para la operacion continua de este tipo de sistemas, el surgimiento de estas no se considera una amenaza para la operacion segura del SEP. El presente articulo, centra su atencion en la aplicacion del analisis modal para evaluar el comportamiento dinamico de un SEP ante la ocurrencia de disturbios de magnitud pequena para diferentes topologias y condiciones de operacion. Los resultados reportados indican, que la aplicacion del analisis modal permite la identificacion directa de las causas que contribuyen en forma negativa al amortiguamiento asociado con los modos electromecanicos, asi como la ubicacion mas adecuada de controles que contribuyan a mejorar el amortiguamiento de los mismos.

  18. Investigación en Progreso: Sistemas Inteligentes en Arquitecturas de Motores para Videojuegos

    Directory of Open Access Journals (Sweden)

    Hernan Merlino

    2013-02-01

    Full Text Available La industria de productos lúdicos informatizados (más conocidos como videojuegos es una de las actividades económicas de mayor crecimiento en los últimos años. Durante el 2006, en los Estados Unidos los ingresos por videojuegos excedieron por primera vez en la historia a los del cine. Sin embargo, a pesar del auge en este mercado, todavía existen más ofertas de empleo que personas preparadas para ocuparlos. Para lograr el desarrollo de un videojuego se requiere de diversos conocimientos, como ser, diseño multimedial, manejo de lenguajes de programación especifica, uso de plataformas de actividades lúdicas, entre otros; sumado a estas actividades es necesario dotar al videojuego con un grado de inteligencia que lo haga no determinista; logrando que los jugadores mantengan durante una mayor cantidad de tiempo el interés por el mismo, pues de no ser así, los jugadores solo lo utilizarían hasta llegar hasta comprender la lógica de funcionamiento y perderian el interés por el videojuego. Es por esto que es de interés para la industria del video juego el desarrollo de motores basados en sistemas inteligentes tomando la experiencia adquirida en otros dominios, como ser, robótica, minería de datos y control de procesos, haciendo las adaptaciones necesarias al dominio en cuestión..

  19. Condiciones de monitoreo para sistema de control de motores de combustión interna

    Directory of Open Access Journals (Sweden)

    Elio Rafael Hidalgo-Batista

    2016-01-01

    Full Text Available En el presente trabajo se presentan las insuficiencias existentes en el sistema de control de los motores de combustión interna pertenecientes a los grupos electrógenos, estas insuficiencias se determinaron luego de un análisis realizado al surgimiento de las fallas y a este sistema. Para la mejora del mismo se da a conocer un procedimiento que permite el seguimiento y procesamiento de las condiciones de monitoreo de estos equipos, el uso de este procedimiento ha permitido: definir los patrones de fallo de las tres variables (de ocho que se estudian que con mayor probabilidad se relacionan con el surgimiento de los fallos, mejorar el método comparativo y dos insuficiencias del sistema de control.

  20. Módulo para la medición de variables en motores de combustión interna

    Directory of Open Access Journals (Sweden)

    Flavio Humberto Fernández-Morales

    2013-01-01

    Full Text Available Los motores de combustión interna son ampliamente utilizados como fuentes de alimentación en lugares de difícil acceso. Usualmente estos motores, de baja y media potencia, no cuentan con la instrumentación adecuada para que el usuario pueda establecer su correcto funcionamiento en variables como: temperatura, presión de aceite y velocidad de giro. En este trabajo se describe el diseño y puesta a punto de un módulo para la medición de las anteriores variables, que puede ser empleado en motores de combustión interna de funcionamiento estacionario. Se fabricó una tarjeta de adquisición de datos basada en el PIC 16F873, al cual se adaptaron los sensores de estado sólido requeridos para la medición de las variables. Este módulo permite la visualización de las variables a medir y puede ser programado para establecer rangos de operación según el motor con el que se quiera trabajar.

  1. Diseño de una sala de pruebas para motores alternativos de combustión interna

    OpenAIRE

    García Pamplona, Jesús

    2007-01-01

    Los bancos de ensayos para motores son de vital importancia para el desarrollo de éstos (o el de alguno de sus componentes) ya que permiten tener un registro de su comportamiento tanto en las condiciones normales de funcionamiento como en situaciones extremas a las que puedan verse obligados a trabajar. Es importante definir la finalidad del banco de ensayos (para producción, investigación, rectificación,…); el tipo de pruebas a realizar (ensayo de potencia, emisión de conta...

  2. Desarrollo de un controlador para motores DC brushless basado en CompactRIO y LabVIEW de National Instruments para el estudio de nuevos algoritmos de control

    OpenAIRE

    García Haro, Juan Miguel

    2011-01-01

    Este proyecto que el CAR inició hace pocos años tiene como objetivo principal el estudio y desarrollo de nuevas tecnologías en el campo de actuación y control automático, que servirá de base para otras futuras investigaciones dentro del centro. La tecnología a la que se hace mención se refiere al control de actuadores basados en motores DC brushless (BLDC Motors) empleando el sistema de hardware embebido CompactRIO y programación LabVIEW de National Instruments. Tradicionalmente se emplea en ...

  3. The distributed generation in Mexico: Which are the new perspectives associated to the institutional reforms of the electrical sector?; La generacion distribuida en Mexico: Cuales son las nuevas perspectivas asociadas a las reformas institucionales del sector electrico?

    Energy Technology Data Exchange (ETDEWEB)

    Islas Samperio, Jorge [Centro de Investigacion en Energia, Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico); Menanteau, Philippe [Departamento de Economia y Politica de la Energia, Universidad Pierre Mendes France (France)

    2004-06-15

    Historically, the electrical systems were constituted from local networks of small scale that were added together progressively to benefit from the effects of a more abundant demand and of the economies of scale in generation, that authorize the large interconnected systems. This logic at the moment seems to show certain limits, the factors that influence these technologies can vary greatly from one country to another, but nevertheless it is found in different degrees certain constants such as the search for a greater reliability in the electrical supply, the putting into work prevention policies of climatic change or the reforms of the electrical sector. In this work the influence of these factors was examined insisting particularly on the consequences of the opening of the electrical sector, departing from an analysis of the international experience in a first time and later examining the case of Mexico in the context of the present energy situation and the debate of the energy reform. The distributed generation: a new vector of technological opportunities in the electrical sector, the barriers for the diffusion of the distributed generation: the lessons of the international experience, the institutional problematic of the distributed generation within the effective legal framework of Mexico. [Spanish] Historicamente, los sistemas electricos se constituyeron a partir de redes locales de pequena escala que se fueron agregando progresivamente para beneficiarse de los efectos de una demanda mas abundante y de las economias de escala en generacion que autorizan los grandes sistemas interconectados. Esta logica parece actualmente mostrar ciertos limites, los factores que influyen sobre estas tecnologias pueden variar grandemente de un pais al otro, pero se encuentra, sin embargo, a grados diferentes ciertas constantes tales como la busqueda de una confiabilidad mas grande en el aprovisionamiento electrico, la puesta en obra de politicas de prevencion de cambio

  4. Comparison the programs of energy efficiency for industrial electric motors; Comparacao de programas de eficiencia energetica para motores eletricos industriais

    Energy Technology Data Exchange (ETDEWEB)

    Mariotoni, Carlos Alberto; Naturesa, Jim Silva; Santos Junior, Joubert Rodrigues dos; Demanboro, Antonio Carlos [Universidade Estadual de Campinas (UNICAMP), Campinas, SP (Brazil). Faculdade de Engenharia Civil, Arquitetura e Urbanismo. Nucleo Interdisciplinar de Planejamento Energetico (NIPE)]. E-mail: cam@fec.unicamp.br; jimnaturesa@yahoo.com; joubert@fec.unicamp.br; anto1810@fec.unicamp.br

    2006-07-01

    This paper aims to present a comparison among the existing programs of energy efficiency for industrial electric motors in Brazil, in the United States of America and in the European Community. The analysis is restricted to the action of each program, considering that the mentioned countries present distinct economical, political and social characteristics. Therefore, it is intended to discuss the main barriers existing in the Brazilian industrial context which cause difficulties to develop a program of electric motors efficiency and to indicate some ways to overcome those barriers. (author)

  5. Diseño y construcción de un banco didáctico para pruebas de motores monofásicos.

    OpenAIRE

    Cornejo Ponce, Erick Alexander; Tinajero Guerra, Jorge Oswaldo

    2015-01-01

    El presente proyecto de grado sirve como guía didáctica del laboratorio donde se muestran los distintos tipos de motores monofásicos más comunes para aplicaciones residenciales, comerciales e industriales. El banco se conforma de una infraestructura metálica donde se instalan bloques de controles, protecciones y equipos de medición para analizar el funcionamiento en vacío de los motores; motor monofásico de fase partida o arranque por devanado auxiliar, motor monofásico de arranque por capac...

  6. Freno de corrientes parásitas para ensayo de motores eléctricos

    Directory of Open Access Journals (Sweden)

    Omar D. Gallo

    2017-01-01

    Full Text Available Este trabajo trata distintos aspectos referidos al diseño, construcción y puesta en marcha de un freno dinamométrico de corrientes parásitas, destinado al ensayo de motores eléctricos. La introducción aborda los antecedentes y las experiencias previas con máquinas similares, además de precisiones constructivas sobre el freno y su fuente de alimentación. La sección de ensayos describe los valores de temperaturas de bobinas y discos y las pruebas bajo estados de carga. Los parámetros tales como fuerzas magnetomotrices, corrientes en discos, momentos y pérdidas, se calculan en la sección referida a valores de funcionamiento. Finalmente, en las conclusiones, se abordan las ventajas y desventajas de este tipo constructivo, y las mejoras que deberían realizarse para mejorar el desempeño de la máquina.

  7. Oportunidades do ambiente domiciliar e fatores associados para o desenvolvimento motor entre três e 18 meses de idade

    OpenAIRE

    Defilipo, Érica Cesário

    2011-01-01

    O ambiente domiciliar tem sido apontado na literatura como um dos fatores extrínsecos que mais influencia o desenvolvimento, pois proporciona à criança oportunidades para a exploração que permitem que o comportamento motor seja estimulado de forma natural. A interação com os pais, a variabilidade de estimulação e a disponibilidade de brinquedos são indicadores críticos para a qualidade do ambiente familiar. Os objetivos do presente estudo foram avaliar as oportunidades prese...

  8. Estimation of the electric potential at Los Humeros, Puebla, Mexico; Estimacion del potencial electrico del yacimiento de los Humeros, Puebla, Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Morales Solano, Nora Blanca [Comision Federal de Electricidad, Perote, Veracruz (Mexico)

    2000-12-01

    The evaluation of the electric potential of geothermal reservoir allows us to estimate the stored energy and the maximum power that could be installed at determined time. The method that was employed for the evaluation is that gradual pressure depletion of the reservoir. It consists of decompressing the system until an abandonment pressure or predetermined time of exploitation is reached. Results indicate that it is possible to generate more than 250 MW during 20 years. [Spanish] La evaluacion del potencial electrico del yacimiento geotermico permite estimar la energia recuperable y la potencia maxima que se puede instalar en un tiempo determinado. El metodo que se empleo para la evaluacion es el de descompresion gradual del yacimiento, que consiste en despresurizar el sistema hasta llegar a una presion de abandono de explotacion predeterminado, y calcular cual es la maxima potencia electrica del yacimiento bajo tales condiciones. El resultado indica que en Los Humeros es posible generar mas de 250 MW durante 20 anos.

  9. The Effectiveness of four Motor Games for the Abdominal Conditioning Eficacia de cuatro juegos motores para el acondicionamiento de los músculos del abdomen

    Directory of Open Access Journals (Sweden)

    B. Flores

    2010-09-01

    Full Text Available

    The purpose of this study was to determine the effectiveness of four traditional motor games (“the tunnel”, “the chicken battle”, “the drunk” and “the wheelbarrow race” for strengthening the abdominal muscles. Electromyography (EMG was collected from rectus abdominis (RA, external oblique (EO, and internal oblique (IO from twelve healthy volunteers during the performance of the games and the trunk curl-up exercise. The EMG amplitude was averaged and normalized using maximal voluntary isometric contractions. A two-way ANOVA (muscle / task was used to compare the level of contraction activity and the way the abdominal muscles co-activated during the different tasks. For EO and IO, the EMG amplitudes during the games were equal or greater than the EMG amplitudes of the curl up. The wheelbarrow race produced the highest intensity of contraction for all muscles. The curl up principally activated RA and IO. On the other hand, the games activated the oblique muscles with higher intensity than RA. On the basis of these results, the motor games are effective for abdominal conditioning.
    KEY WORDS: motor games, exercises, training, abdominal muscles, electromyography.

     

    El objetivo de este estudio fue determinar la eficacia de cuatro juegos motores (“el túnel”, “la pelea de gallinas”, “el tentetieso” y “la carretilla” para el fortalecimiento de los músculos del abdomen. Para ello, se registró la electromiografía de los músculos rectus (RA, obliquus externus (OE y obliquus internus abdominis (OI de 12 voluntarios sanos durante la ejecución de los juegos y del ejercicio de encorvamiento del tronco. La amplitud electromiográfica fue promediada y normalizada respecto a la contracción voluntaria isométrica máxima. Posteriormente, se realizó un ANOVA de dos factores (músculo / tarea para comparar la intensidad de la activación muscular y

  10. Software efical para la gestión eficiente de motores en la industria; Software Efical for Efficient Management of Motors in the Industry

    Directory of Open Access Journals (Sweden)

    Elías V de la Rosa Masdueño

    2011-02-01

    Full Text Available En este trabajo se explica el diseño, e implementación de una herramienta capaz de controlar y gestionareficientemente los motores eléctricos de una industria. Para ello se elaboró un software de fácil manejoque resolviera el problema y que además brindara otras opciones a los usuarios que hicieran uso delmismo. EFICAL®, controla el inventario de los motores y sus equipos accionados, sus parámetrosnominales, mantenimientos y ensayos, permite calcular la eficiencia por distintos métodos y brinda ademásdatos de catálogos de diversos fabricantes.  This work explains the developing and application of a software tool for efficient management of electricmotors in the industry. For this it was develop friendly software that solve the problem and more over givesanother option to users. EFICAL®, controls the motor inventory and the equipment that they drive, theirnominal parameters, maintenance, and testing; also allow the efficiency calculations by various methodsand gives the catalog data of some manufacturers.

  11. Influencia del porcentaje de mezcla del aceite de higuerilla en la obtención de combustible alternativo para motores diesel

    OpenAIRE

    Arnoldo Emilio Delgado; Willian Aperador Chaparro; Jorge Réne Silva Gonzalez

    2011-01-01

    En el presente artículo se describe el uso del aceite de higuerilla como combustible alternativo en motores diesel. Para este fi n, se obtiene biodiesel a partir de aceite de higuerilla mediante el proceso de transesterifi cación. Se prueban tres mezclas de biodiesel (B5%, B10% y B20%) en un motor diesel, para el cual se midieron los siguientes parámetros: la potencia, el consumo de combustible, la temperatura del motor, y los gases de combustión;las mezclas fueron caracterizadas mediante la ...

  12. Diagnóstico de motores eléctricos para la localización de fallas incipientes

    OpenAIRE

    Delgado Arredondo, Paulo Antonio

    2017-01-01

    En este trabajo se presenta la exploración de metodologías de diagnóstico basadas en el análisis de vibraciones y sonido, debido a que cada señal amplifica mejor la presencia de un tipo de avería, y que, frente a un motor con un funcionamiento sospechoso, resulta conveniente combinar la información de cada una de ellas. Una de las contribuciones de este trabajo es una nueva metodología de análisis para la detección de fallas en motores de inducción en estado estacionario. El diagnóstico de la...

  13. Aplicación de la medida de NOx para el control de motores diesel sobrealimentados

    OpenAIRE

    Cabrera López, Pedro

    2013-01-01

    Los motores de combusti'on interna est'an inmersos en una constante evoluci'on tecnol'ogica con el ¿n de mejorar sus prestaciones y satisfacer adem'as las cada vez m'as restrictivas normas anticontaminantes. En el caso de los motores diesel esto concierne especialmente a las emisiones de NOx y part'¿culas. Los sistemas destinados a reducir estas emisiones (inyecci'on directa common-rail, sobrealimentaci'on con geometr'¿a variable, recirculaci'on de gases de escape, trampas de part'¿c...

  14. Standardization for electric energy saving; Normalizacion para el ahorro de energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Reyes Diaz, Arturo [Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE), Mexico, D. F. (Mexico)

    1994-12-31

    This work describes shortly the current legislation on the standardization; as well as the participation of the entities Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE) and Programa de Ahorro de Energia (PAESE) in the consulting committees, for the elaboration of the Mexican official standards focussed to electric power saving. [Espanol] El presente trabajo, describe brevemente la legislacion actual sobre la normalizacion; asi como la participacion de las entidades Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE) y Programa de ahorro de Energia (PAESE) en los comites consultivos, para la elaboracion de normas oficiales mexicanas enfocadas al ahorro de energia electrica.

  15. Standardization for electric energy saving; Normalizacion para el ahorro de energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Reyes Diaz, Arturo [Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE), Mexico, D. F. (Mexico)

    1993-12-31

    This work describes shortly the current legislation on the standardization; as well as the participation of the entities Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE) and Programa de Ahorro de Energia (PAESE) in the consulting committees, for the elaboration of the Mexican official standards focussed to electric power saving. [Espanol] El presente trabajo, describe brevemente la legislacion actual sobre la normalizacion; asi como la participacion de las entidades Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE) y Programa de ahorro de Energia (PAESE) en los comites consultivos, para la elaboracion de normas oficiales mexicanas enfocadas al ahorro de energia electrica.

  16. Robust control decentralized by sliding ways of electrical of power multi-machines systems; Control robusto descentralizado por modos deslizantes de sistemas electricos de potencia multimaquinas

    Energy Technology Data Exchange (ETDEWEB)

    Huerta Avila, Hector

    2008-09-15

    This work deals with the problem of robust decentralized control of multimachine electric power systems. These systems are subject to different perturbations, such as short circuits, connection and/or disconnection of loads, lines generators, mechanical torque variations, etc. Then, it is necessary controllers which guarantee robustness under those perturbations to provide electrical energy to the loads with admissible stability margins. Moreover, the controller must be robust under parametric variations due to model uncertainties, and other physical reasons. The electrical power systems are modeled as complex great scale nonlinear systems. Then, the controller design is a challenging problem. Thus, the decentralized control schemes enable to avoid these problems. This work proposes three novel robust nonlinear techniques. The first one is based on the block control and integral sliding modes. The second obtains a sliding manifold from the Hamiltonian model of a nonlinear system to use this manifold in the integral sliding modes. The third technique enables to apply the sliding mode technique to a nonlinear block controllable system, by using Lyapunov function in each block. Then, four control schemes for electric power systems are designed. The four control schemes are robust under the perturbations of electric power systems mentioned above. The controllers proposed can be implemented in any electric power system with n generators, m lines and k loads. [Spanish] Este trabajo esta dedicado al diseno de esquemas de control robustos descentralizados que sean capaces de responder satisfactoriamente en sistemas electricos de potencia multimaquinas. Estos sistemas estan sujetos a perturbaciones de diferentes tipos, como cortos circuitos, entrada y salida de lineas de cargas o de generadores. Es evidente la necesidad de controladores que puedan rechazar estas perturbaciones para proveer energia de calidad y sin interrupciones a todos los usuarios conectados a la red

  17. Elementos teórico-prácticos útiles para comprender el uso de los motores de búsqueda en Internet

    OpenAIRE

    Oller Gómez, Jorge

    2003-01-01

    Con el objetivo de presentar un conjunto de elementos teóricos y prácticos, útiles para conocer el funcionamiento de los llamados motores de búsqueda en Internet, se revisó la literatura existente en la red sobre el tema mediante los conocidos buscadores Google, Infoseek, WebCrawler, entre otros. Se presentan las características generales de los motores de búsqueda y sus componentes, con un énfasis especial en el empleo de los operadores booleanos y su utilización en cada uno de los motores e...

  18. Diseño y construcción del múltiple de escape para el motor Yamaha FZR600 de la formula SAE

    OpenAIRE

    Calle Solís, Eloy Tarquino; Rivas Macero, Dorian Alberto

    2014-01-01

    El documento consiste en la búsqueda de un diseño óptimo de múltiple de escape para implementarlo en el motor Yamaha FZR600 del prototipo Formula SAE. Este elemento debe brindar un buen funcionamiento del motor, cumplir con las normas del reglamento en cuanto a: ubicación dentro del chasis del monoplaza, niveles de ruido del motor, costo y medidas de seguridad que impone la competencia Formula Student. The document consists in the way to search an optimal design of the exhaust system in th...

  19. Influencia del porcentaje de mezcla del aceite de higuerilla en la obtención de combustible alternativo para motores diesel

    Directory of Open Access Journals (Sweden)

    Arnoldo Emilio Delgado

    2011-01-01

    Full Text Available En el presente artículo se describe el uso del aceite de higuerilla como combustible alternativo en motores diesel. Para este fi n, se obtiene biodiesel a partir de aceite de higuerilla mediante el proceso de transesterifi cación. Se prueban tres mezclas de biodiesel (B5%, B10% y B20% en un motor diesel, para el cual se midieron los siguientes parámetros: la potencia, el consumo de combustible, la temperatura del motor, y los gases de combustión;las mezclas fueron caracterizadas mediante la densidad, viscosidad, índice de refracción y calor de combustión. Se determinó que el uso del aceite de higuerilla en la mezcla genera un aumento en la viscosidad y el consumo de combustible, además también infl uye en la reducción del poder calorífico, potencia del motor, los gases de combustión como el CO y CO2, los óxidos de azufre, los hidrocarburos, la opacidad en los humos del escape del motor y ocasiona un equilibrio en el rendimiento observado en el motor diesel, manifi esto en las temperaturas del motor.

  20. Automatización de una línea de montaje de motores para parabrisas

    OpenAIRE

    Castillero Carmona, Marc

    2009-01-01

    Este proyecto está enfocado a la automatización de una línea de producción de parabrisas. Donde también se tendrá que realizar la instalación eléctrica para la alimentación de componentes eléctricos. La línea de producción pertenece a la empresa Robert Bosch fábrica de Castellet, donde se fabrican parabrisas traseros y delanteros, y pequeños componentes para automoción. La línea cuenta con varias máquinas automáticas y puestos manuales, de los cuales no se utilizarán todos para la fa...

  1. Electrical energy saving in motors and frequency variators; Ahorro de energia electrica en motores y variadores de frecuencia

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Neri, Roger [Comision Federal de Electricidad (CFE) (Mexico)

    2005-07-01

    The necessity of saving energy is urgent and undeniable. We must already begin with the rational use of energy. Which is obtaining the maximum benefit of the consumed energy and of the necessary facilities for its generation, transmission and use. Guaranteeing at the same time an operation free of interferences or interruptions for the users. The electricity in alternating current does not allow its storage, reason why it is necessary to generate and distribute it at the precise moment when it is required. This forces to determine the proportions of the generation facilities, to be able to feed the periods of maximum demand called {sup p}eaks{sup .} It is this very point where the problem of the inappropriate use of the electrical energy starts. The energy waste is self-evident during the periods of low demand because of the low efficiency of the sub-utilized facilities. Electrical motors of the induction type use approximately more than 60% of the energy in the industry. If we use high efficiency motors instead of standard motors, a better advantage of the energy demanded from Comision Federal de Electricidad (CFE) is obtained. [Spanish] Es impostergable e innegable la necesidad de ahorrar energia. Tenemos que empezar ya con el uso racional de la energia: Obtener el maximo beneficio de la energia consumida y de las instalaciones necesarias para su generacion, transmision y utilizacion. Garantizando a los usuarios un funcionamiento sin interferencias o interrupciones. La electricidad en corriente alterna no permite su almacenamiento, por lo que es necesario generarla y distribuirla en el momento preciso en que es requerida. Esto obliga a dimensionar las instalaciones de generacion, para poder alimentar los periodos de maxima demanda llamados pico. Desde esta parte inicia el problema de la mala utilizacion de la energia electrica. Ya que en los periodos de baja demanda, las instalaciones se encuentran subutilizadas y si su eficiencia es muy baja, el desperdicio de

  2. Amplitude-measuring devices for electric pulses in the nanosecond region; Dispositifs de mesure d'amplitude d'impulsions electriques dans le domaine de la nanoseconde; Pribory dlya izmereniya amplitudy ehlektricheskikh impul'sov v sfere nanosekundy; Dispositivos para medir la amplitud de los impulsos electricos en la region del nanosegundo

    Energy Technology Data Exchange (ETDEWEB)

    Samueli, J J; Sarazin, A [Institut d' Etudes Nucleaires d' Alger (France)

    1962-04-15

    amplitud maxima de impulsos rapidos. En general, estos circuitos deben poder dar una indicacion independiente, de ser posible, de la duracion y de la forma de la senal estudiada. El primer circuito es un alargador de impulsos, es decir un aparato que transforma las senales rapidas en impulsos de duracion constante y de amplitud proporcional a la amplitud inicial, y que, por tanto, permite estudiar las senales rapidas con un selector de amplitudes convencional. El circuito admite senales de duracion superior a 2 ns y de amplitud comprendida entre 1 y 15 V. Emite dos senales de duracion constante de 100 ns y de 1 {mu}s. El segundo circuito es un discriminador de amplitudes rapido, de umbral graduable entre 1 y 30 V y cuya desviacion de lectura para impulsos de 100 y de 2 ns de duracion es del orden de 18%. La senal de salida tiene una amplitud de 1,5 V y una duracion standard de 0,2 {mu}s. (author) [Russian] Daetsya opisanie dvukh ehlektronnykh priborov, dayushchikh vozmozhnost' proizvodit' izmerenie maksimal'noj amplitudy bystrykh impul'sov. V obshchem ot ehtikh priborov trebuyut predostavleniya, po vozmozhnosti, nezavisimoj indikatsii dlitel'nosti i formy izuchaemogo signala. Pervyj pribor predstavlyaet soboj rasshiritel' impul'sov, t.e ustanovku, kotoraya preobrazuet bystrye signaly v impul'sy postoyannoj shiriny i proportsional'noj amplitudy po sravneniyu s nuzhnoj amplitudoj i kotoraya poehtomu pozvolit izuchit' bystrye signaly pri pomoshchi obychnogo amplitudnogo selektora. Pribor prinimaet signaly shirinoj svyshe dvukh nanosekund, a amplituda kolebletsya mezhdu odnoj i 15 vol'tami. On daet dva signala postoyannoj shiriny v 100 nanosekund i v 1 {mu}s. Vtoroj pribor predstavlyaet iz sebya bystryj amplitudnyj diskriminator s reguliruyushchim porogom ot 1 do 30 vol't, i otschetnoe otklonenie kotorogo dlya impul'sov shirinoj v 100 i dve nanosekundy sostavlyaet 18%. Vykhodnoj signal imeet amplitudu v poltora vol'ta i standartnuyu shirinu v 0,2 {mu}s. (author)

  3. Simulation of the electric systems of the Laguna Verde nuclear power station; Simulacion de los sistemas electricos de la Central Laguna Verde

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Lozano, Saul; Ruiz Ponce, Gerardo E [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1992-03-01

    In this article, the electric system models of the Laguna Verde Nuclear Power Station (CNLV) simulator, are presented. These models permit the functioning simulation, in the different operation modes of the main generator (Ruiz and Rodriguez 1991a), of the auxiliaries system and of the substation (Ruiz and Rodriguez 1991b), and of the emergency diesel generators system (Ruiz and Rodriguez 1991c). The general characteristics of such systems, considered as the basis to obtain the representative models, which were developed as modules in an independent way to be integrated in the simulator, are also described. [Espanol] En este articulo, se presenta los modelos de los sistemas electricos del simulador de la Central Laguna Verde (CLV). Estos modelos permiten simular el funcionamiento, en los diferentes modos de operacion del generador principal (Ruiz y Rodriguez, 1991a), del sistema de auxiliares y de la subestacion (Ruiz y Rodriguez, 1991b) y del sistema de generadores diesel de emergencia (Ruiz y Rodriguez, 1991c). Asimismo, se describen las caracteristicas generales de tales sistemas, consideradas como la base para obtener los modelos representativos, los cuales fueron desarrollados como modulos en forma independiente para integrarse al simulador.

  4. Energy saving or privatization? The case of the electric residential sector of Mexico; Ahorro de energia o privatizacion? El caso del sector electrico residencial de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Friedmann, Rafael [University of California, Berkeley, CA (United States)

    1994-12-31

    The validity of the premise that proposes the privatization of the electric sector as a solution to the problem of obtaining enough investment capital for the continuous expansion of the electric sector is examined. It is shown that the growth of the demand foreseen for the residential sector for year 2000, can be totally reduced by introducing technologies economically feasible to increase the efficiency and end uses of the residential electricity. With the efficient use of the electricity, the economical development is allowed for the residential sector, without large increments of the residential electricity demand. [Espanol] Se examina la validez de la premisa que propone la privatizacion del sector electrico como una solucion al problema de conseguir suficientes capitales de inversion para la continua expansion del sector. Se muestra que se puede reducir casi totalmente el crecimiento en la demanda prevista del sector residencial al ano 2000, introduciendo tecnologias economicamente factibles para aumentar la eficiencia en los usos finales de electricidad residencial. Con el uso eficiente de la electricidad, se permite el desarrollo economico del sector residencial sin grandes incrementos en la demanda residencial de electricidad.

  5. Energy saving or privatization? The case of the electric residential sector of Mexico; Ahorro de energia o privatizacion? El caso del sector electrico residencial de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Friedmann, Rafael [University of California, Berkeley, CA (United States)

    1993-12-31

    The validity of the premise that proposes the privatization of the electric sector as a solution to the problem of obtaining enough investment capital for the continuous expansion of the electric sector is examined. It is shown that the growth of the demand foreseen for the residential sector for year 2000, can be totally reduced by introducing technologies economically feasible to increase the efficiency and end uses of the residential electricity. With the efficient use of the electricity, the economical development is allowed for the residential sector, without large increments of the residential electricity demand. [Espanol] Se examina la validez de la premisa que propone la privatizacion del sector electrico como una solucion al problema de conseguir suficientes capitales de inversion para la continua expansion del sector. Se muestra que se puede reducir casi totalmente el crecimiento en la demanda prevista del sector residencial al ano 2000, introduciendo tecnologias economicamente factibles para aumentar la eficiencia en los usos finales de electricidad residencial. Con el uso eficiente de la electricidad, se permite el desarrollo economico del sector residencial sin grandes incrementos en la demanda residencial de electricidad.

  6. Algoritmo para la determinación de los parámetros del motor de inducción por datos nominales; Algorithm for the determination of the parameters of the induction motor for nominal data

    Directory of Open Access Journals (Sweden)

    Ignacio Romero Rueda

    2011-02-01

    Full Text Available El trabajo presenta un nuevo enfoque para el cálculo de los parámetros del circuito equivalente para régimennominal, utilizando el teorema de Thevenin y las expresiones deducidas del mismo. Se comparan losresultados obtenidos por esta metodología con varias vías, existentes en la literatura y a través de losensayos típicos (vacío, rotor bloqueado y CD para el motor de inducción de rotor en jaula. La metodologíase aplica a dos motores y muestra efectividad en este campo.  Presently article is carried out an analysis from the experimental point of view of the variables of diagnosisstate (Opacity of the gases, temperatura of the gases of the escape, consumption of fuel for the determinationof the technical state or condition the injection apparatus of a diesel motive installation.

  7. Cancellation of the energy efficiency program in Peru because of the electrical sector privatization; Cancelacion del programa de eficiencia energetica en Peru por la privatizacion del sector electrico

    Energy Technology Data Exchange (ETDEWEB)

    Tomecich Cordova, Anibal [Centro de Conservacion de Energia y del Ambiente (CENERGIA) (Peru)

    2005-04-15

    The evolution of the activities related to the electric efficiency before and after the reforms of the electrical sector in Peru derived from the liberation of the economy is explained. In the first part it is explained as an antecedent the development of one of the most successful campaigns regarding demand management, considering it as a variable and not as a datum of the problem for statistic effects. The results of such campaign demonstrated that a proper management of the variable electricity demand, capital investments can be deferred in the electric infrastructure within the frame of sustainable social development. Afterwards it is explained the new regulatory frame and the principles that prevail for the fixation of the tariffs when the electrical sector evolves from a vertical structure to a horizontal structure. Finally it is mentioned the activities that have been carried out in a latter period to the implantation of the reforms in the sector and some important examples such as the obligation for the electric utilities to reduce their technical and commercial losses. [Spanish] Se explica la evolucion de las actividades relacionadas a la eficiencia energetica antes y despues de las reformas del sector electrico en Peru, derivada de la liberacion de la economia. En la primera parte se explica como antecedente el desarrollo de una de las campanas mas exitosas en el manejo de la demanda, considerandola como una variable y no como un dato del problema para efectos estadisticos. Los resultados de tal campana demostraron que manejando adecuadamente la variable demanda de electricidad, se puede diferir inversiones de capital en la infraestructura electrica dentro del marco de un desarrollo social sostenible. A continuacion se explica el nuevo marco regulatorio y los principios que rigen para la fijacion de las tarifas cuando el sector electrico se transforma de una estructura vertical a una estructura horizontal. Finalmente, se menciona las actividades que se

  8. Uso de óleos vegetais puros como combustíveis para motores diesel

    Directory of Open Access Journals (Sweden)

    Deny Cesar Moreira

    2016-05-01

    Full Text Available This article aims to review the productive situation of the domestic industry of vegetable oils, point out what the main sources of raw materials and evaluate the use of these oils as a fuel source diesel engines for motor vehicles and generating electricity. Show the importance of these oils as a fuel source, generation of employment and income and especially social development when their use for provision of electricity to isolated communities. It reaffirms the importance of the use of vegetable oils as another renewable fuel source and its relevance with environmental issues.

  9. Realidad virtual para el mantenimiento de motores de avión

    Directory of Open Access Journals (Sweden)

    Aiert Amundarain

    2003-07-01

    Full Text Available Exponemos un sistema de realidad virtual para la simulación de procesos de mantenimiento en aeronáutica que se ha desarrollado en el marco del Proyecto REVIMA. Hemos desarrollado un hardware nuevo (háptico y resuelto diversos problemas al elaborar el software que integra el sistema. El nuevo háptico se emplea para realizar el seguimiento del movimiento de las manos, y al mismo tiempo devuelve una fuerza que provoca la sensación de estar trabajando con una maqueta física. Los principales módulos de software son: el módulo de generación de imágenes, el módulo de colisión y el módulo de control. La integración del sistema está basada en dos ordenadores conectados mediante una LAN que comparten diferentes tareas y datos. El módulo de visualización ha sido implementado empleando sistemas gráficos de bajo coste y mediante un estudio exhaustivo se ha logrado una frecuencia válida para las operaciones de simulación. Los modelos consisten en más de dos mil elementos diferentes y emplean alrededor de dos millones de polígonos para describir su geometría. Este trabajo presenta una breve descripción del conjunto y desarrolla de modo específico las técnicas de visualización que se han desarrollado.

  10. Recursos materiales para el desarrollo motor grueso en escolares de 6-9 años

    Directory of Open Access Journals (Sweden)

    José Manuel Cenizo Benjumea

    2017-11-01

    Full Text Available El objetivo de la investigación ha sido conocer los recursos materiales de educación física más eficaces para mejorar el desarrollo motor grueso del alumnado de 6 a 9 años, en función de su sexo y edad. La muestra de 982 escolares estuvo dividida en tres grupos experimentales según el tipo de material fungible y un grupo de control. Se empleó el test TGM-2, mediante un pretest y un postest tras una intervención de 14 sesiones. La diferencia de puntuaciones directas en los dos ámbitos (locomotor y control de objetos fue mayor en los grupos experimentales (p-valor<0,05. Dicha diferencia resulta más elevada con el uso de materiales alternativos, seguido de “solo balones” y “no balones” en ambos ciclos educativos y en los dos sexos, excepto para las niñas de segundo ciclo, donde los mejores resultados se producen en el grupo experimental de materiales “solo balones”.

  11. Generador oxihidrógeno para motor de combustión interna

    OpenAIRE

    Cebrián López, Héctor

    2014-01-01

    La pujada de preus dels carburants per la crisi econòmica actual motiva a investigar fonts d'energia alternatives. Les fonts d'energia convencionals com els combustibles fòssils són contaminants i costoses, i l'hidrogen generat a través de l'electròlisi de l'aigua és una solució ecològica i econòmica. En aquest projecte es dissenya un generador d'oxihidrógeno i s'estudien els efectes de l'addició d'aquest gas en 2 motors de combustió interna de 2 temps i 50 cc. Els resultats indiquen que, ...

  12. Factores de un modelo electromagnético a escala para desarrollar motores lineales de laboratorio

    OpenAIRE

    Becerra Escudero, Carlos; Bermudez, Gustavo

    1982-01-01

    El presente trabajo emplea un "modelo electromagnético" basado en factores dimensionales de longitud, corriente y número de vueltas, los cuales fueron seleccionados como materia básica para desarrollar teórica y experimentalmente un sistema prototipo de levitación-propulsión magnética de vehículos a pequeña escala de laboratorio. El trabajo proporciona las especificaciones técnicas generales del diseño del modelo a escala, concebido primordialmente en base a una máquina real de 4000 Kg de...

  13. Calculation of sensitivities in electrical systems with SIFLETCA devices; Calculo de sensibilidades en sistemas electricos con dispositivos SIFLETCA

    Energy Technology Data Exchange (ETDEWEB)

    Rubio Marroquin, Gabriel Omar

    2004-03-15

    de potencia (CUFP). Ademas, se desarrolla en esta tesis las ecuaciones utilizadas en el Jacobiano del metodo Newton-Raphson, para resolver flujos de potencia incluyendo los dispositivos SIFLETCA. Se muestra diferentes aplicaciones que se tienen al instalar un dispositivo, tales como prevencion de flujos en anillo, barrera electronica, incremento en la capacidad de transmision y especificacion del flujo de potencia en lineas de transmision. Por otra parte, se desarrolla en la tesis un analisis de sensibilidades de un sistema de potencia en estado estacionario. Tambien se proponen en la tesis los parametros de control para los cuales se calcula las sensibilidades. Asimismo, se utiliza un indice de desempeno para medir el grado de congestion de un sistema electrico. Al calcular las sensibilidades se utiliza los resultados obtenidos de los flujos de potencia. Se usa 4 redes electricas para encontrar donde se debe situar cada dispositivo SIFLETCA para reducir la congestion en el sistema. Tambien, se compara el metodo desarrollado en la tesis con un metodo de sensibilidades que emplea flujos de CD para validacion y mostrar las ventajas de usar el metodo Newton en flujos de potencia.

  14. Prototipo de motor de realidad aumentada tridimensional para dispositivos móviles

    OpenAIRE

    Suárez Canosa, Xoan Iago

    2016-01-01

    La Realidad Aumentada es la tecnología que nos permite superponer elementos gráficos sobre el mundo real. Para que ésta pueda funcionar adecuadamente es necesario conocer con precisión cuál es la posición de la cámara desde la que vemos el mundo y cómo se conforman las imágenes que nos muestra. En este trabajo mostramos cómo calcular la posición de la cámara a partir de diferentes marcas tanto naturales como artificiales, vemos cual es la mejor forma de proyectar sobre estas ma...

  15. Faults and energy losses in electric contacts; Fallas y perdidas de energia en contactos electricos

    Energy Technology Data Exchange (ETDEWEB)

    Bratu Serban, Neagu; Campero Littlewood, Eduardo [Universidad Autonoma Metropolitana, Mexico, D. F. (Mexico)

    1994-12-31

    In this paper a brief description is made of the behavior of the electric contacts and the elements that affect in the heat release during its operation. The mathematical expressions describing this phenomenon are presented. The losses that can be produced at the contacts are evaluated and the graphs, where the behavior of these different operating conditions can be seen, are included. [Espanol] En este articulo se hace una breve descripcion del comportamiento de los contactos electricos y de los elementos que influyen en la generacion de calor durante su operacion. Se presentan las expresiones con las que se describe matematicamente este fenomeno. Se evaluan las perdidas que pueden llegar a tenerse en los contactos y se incluyen graficas donde puede verse el comportamiento de estos en diferentes condiciones de operacion.

  16. Faults and energy losses in electric contacts; Fallas y perdidas de energia en contactos electricos

    Energy Technology Data Exchange (ETDEWEB)

    Bratu Serban, Neagu; Campero Littlewood, Eduardo [Universidad Autonoma Metropolitana, Mexico, D. F. (Mexico)

    1993-12-31

    In this paper a brief description is made of the behavior of the electric contacts and the elements that affect in the heat release during its operation. The mathematical expressions describing this phenomenon are presented. The losses that can be produced at the contacts are evaluated and the graphs, where the behavior of these different operating conditions can be seen, are included. [Espanol] En este articulo se hace una breve descripcion del comportamiento de los contactos electricos y de los elementos que influyen en la generacion de calor durante su operacion. Se presentan las expresiones con las que se describe matematicamente este fenomeno. Se evaluan las perdidas que pueden llegar a tenerse en los contactos y se incluyen graficas donde puede verse el comportamiento de estos en diferentes condiciones de operacion.

  17. Evolution of short circuit levels in the National Electric System, years 2007 to 2011; Evolucion de los niveles de cortocircuito del Sistema Electrico Nacional, anos 2007 al 2011

    Energy Technology Data Exchange (ETDEWEB)

    Quintana Castaneda, J; Reyes Escobedo, G [Instituto de Investigaciones Electricas (Mexico)]. E-mails: jqc@iie.org.mx; gustavo.reyes@iie.org.mx; Ibarra Romo, F.G. [Comision Federal de Electricidad (Mexico)]. E-mail: federico.ibarra@cfe.gob.mx

    2013-03-15

    The present document shows an analysis of 2011 short-circuit levels on the different nodes (substations) that integrate the National Electric System. This analysis presents the figures of short-circuit levels on past years, stating on 2007, with the purpose of detecting the variation on each one of these nodes and identify the cases that because it's high levels are considered as critical nodes of the transmission system. At the end of the analysis some recommendations to minimize the potential risks are given on those substations classified as critical nodes. [Spanish] En este documento se expone un analisis de los niveles de cortocircuito que se presentaron en el 2011 en los distintos nodos (subestaciones) que conforman la red del Sistema Electrico Nacional (SEN). Este analisis muestra las cifras de los niveles de cortocircuito que se han presentado desde el ano 2007, a fin de estudiar el comportamiento y evolucion que han tenido los nodos de la red electrica, identificando aquellos puntos que por sus altos niveles de cortocircuito se consideran como nodos criticos. En la parte final del analisis se dan algunas recomendaciones para disminuir los riesgos que se pudieran presentar en aquellas subestaciones clasificadas como nodos criticos.

  18. Eletroerosão por fio em metal duro para ferramentas de estampagem de lâminas de motores elétricos

    OpenAIRE

    Hespanhol, Heber de Carvalho

    2009-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Mecânica. O processo de eletroerosão por fio é utilizado atualmente na fabricação da maioria das matrizes e punções de metal duro (carbeto de tungstênio), usados em ferramentas de estampagem de aços para motores elétricos. As indústrias de eletrodomésticos, motores elétricos industriais, transformadores e compressores herméticos, utilizam ferramentas progressivas de...

  19. Diseño e implmentación de maletas didácticas con los Mini PLCS LOGO y ZELIO para aplicaciones en secuencia de motores.

    OpenAIRE

    Mestanza Ortiz, Joan Jorge; Cruz Lindao, Bolivar Geovanny

    2015-01-01

    El presente trabajo de tesis contempla el diseño e implementación de módulos didácticos utilizando los mini PLCS LOGO y ZELIO, para aplicaciones en secuencia de motores de manera manual o automática, el cual tendrá como tarea única y primordial, las aplicaciones de arranque de motores existentes en la industria, de forma manual o automática los cuales serán implementados por los estudiantes de la carrera Ingeniería Electrónica e Ingeniería Eléctrica de la Universidad Politécnica Salesiana se...

  20. "Desarrollo software de un módulo de cinética química en fase gaseosa para simulación 3D de motores de Combustión interna"

    OpenAIRE

    Forigua Rodriguez, Carlos Felipe

    2015-01-01

    Un reactor a volumen constante para (RVC) fue implementado utilizando Cantera dentro de KIVA-4 en un acople multifísico con el fin de simular varios motores. Se simuló un motor de encendido por compresión de carga homogénea (HCCI), un motor Diesel de inyección directa y un motor encendido por chispa. Sólo densidades parciales se intercambian entre KIVA y Cantera. Una densidad parcial inicial se calcula en KIVA para Cantera. Nuevas densidades son generadas por Cantera usando el ...

  1. Core y sistema de control neuro-motor: mecanismos básicos para la estabilidad del raquis lumbar

    Directory of Open Access Journals (Sweden)

    Víctor SEGARRA

    2014-09-01

    Full Text Available El "CORE" es un concepto funcional que engloba la integración de tres sistemas cuyo óptimo funcionamiento garantiza la realización de tareas con una mayor eficacia y seguridad a nivel raquídeo, permitiendo adecuados niveles de estabilidad y control del movimiento. En este sentido, a fin de afrontar con éxito retos que demanden un control dinámico de la columna y la pelvis, el SNC debe aplicar estrategias diferentes, sopesando as fuerzas internas y externas con el fin de proporcionar una respuesta muscular que permita un movimiento óptimo y resista cualquier posible perturbación. En el presente manuscrito se revisa de forma aplicada, las bases, atendiendo a la información disponible actualmente, de los mecanismos básicos de control motor y las posibles alteraciones en los mismos a ser considerados por los especialistas en ejercicio respecto a su intervención mediante programas de ejercicio para la mejora de la capacidad de estabilización raquídea.

  2. Diseño y construcción de un prototipo digital para diagnósticar fallas en motores de inducción

    Directory of Open Access Journals (Sweden)

    FERNANDO VILLADA DUQUE

    2007-01-01

    Full Text Available En este trabajo se presenta el desarrollo de un prototipo digital utilizando un procesador de señales digitales DSP, al cual se le han incorporado dos algoritmos para diagnosticar fallas en el estator de motores de inducción. El primer algoritmo utiliza las redes neuronales artificiales para estimar la corriente de secuencia negativa, la cual es utilizada como indicador de falla. El segundo algoritmo utiliza la impedancia de secuencia inversa como indicador de falla. Se presenta la estructura general del prototipo y su implementación. Se incluyen los resultados obtenidos experimentalmente en un motor de 3 HP utilizando medida en línea a través del prototipo digital

  3. Allocation of thermoelectric units in short term in large scale electric power systems; Asignacion de unidades termoelectricas a corto plazo en sistemas electricos de potencia de gran escala

    Energy Technology Data Exchange (ETDEWEB)

    Guillen Moya, Isaias

    1987-08-01

    mathematics with dynamic programming to accelerate the search of a solution and (2) the development of an alternating method to solve the economic dispatch problem without restrictions. This method does not have to form the curve of incremental equivalent cost, with which a great deal of memory storage and execution time are saved. [Spanish] Se presenta un metodo para resolver el problema de asignacion de unidades termoelectricas en sistemas electricos de potencia de gran escala. El problema consiste en determinar cuales unidades generadoras deberan ser programadas para entrar o salir de operacion durante los intervalos de horizonte de planeacion, de tal forma que se satisfagan a minimo costo, y en forma confiable la demanda pronosticada de potencia electrica y las restricciones fisicas y operativas de los componentes del sistema de potencia. El metodo esta compuesto por dos etapas: la primera etapa encuentra una solucion inicial factible de unidades termo por medio de metodos heuristicos. La segunda etapa produce una solucion a partir de un estado de asignacion inicial factible. El costo de operacion se reduce aplicando programacion dinamica en aproximaciones sucesivas, de tal forma que el producto de cada interaccion constituye el estado de asignacion de menor costo encontrado hasta esa etapa. El rango de busqueda para la solucion optima es reducido aplicando tecnicas de relajacion lagrangeana para seleccionar unicamente las unidades que tienen el mayor potencial de reducir el costo de operacion. El algoritmo es validado utilizando un sistema representativo del sistema interconectado nacional que consta de 108 unidades termoelectricas agrupadas en 7 grupos de generacion, para un horizonte de planeacion de una semana dividido en intervalos horarios, conteniendo 18,144 variables discretas, 18,144 variables continuas y 39,024 restricciones. En una computadora VAX 11/780 el problema es resuelto en 55 minutos de CPU con una estimacion del 1.02% de suboptimalidad que indica que

  4. Pre-diseño de un motor eléctrico para el accionamiento de un automotor

    OpenAIRE

    Pernia Nieto, Carlos

    2017-01-01

    El presente proyecto versa sobre el pre-diseño de un motor síncrono de imanes permanentes. La motivación que ha llevado al planteamiento y realización de este trabajo es la necesidad actual de mejorar los motores eléctricos utilizados en tracción ferroviaria. Estos motores son en su mayor parte motores trifásicos de tipo asíncrono, seguidos en número por motores trifásicos síncronos y, en muy pocos casos, de corriente continua, siendo la mayoría de estos últimos usados en ferrocarriles antig...

  5. Desarrollo de un drive para motores paso a paso y aplicación del filtro de Kalman para el sistema de colimación del LHC = Development of a stepper motor drive and Kalman Filter application for the LHC collimation system

    OpenAIRE

    Picatoste Ruilope, Ricardo

    2010-01-01

    Este proyecto describe el trabajo realizado durante 14 meses en una estancia en prácticas para estudiantes del CERN. El trabajo consiste en el desarrollo, implementación y testeo de un drive para motores paso a paso que se utilizará en el sistema de colimación del LHC. Se propone así mismo la utilización del filtro de Kalman para obtener una estimación del ángulo, desarrollandose una implementación del mismo aplicable en tiempo real.

  6. New petroleum lifting concept - tubular asynchronous motor application for onshore petroleum exploitation - (MATAEOS); Nova concepcao para bombeamento de petroleo - motor assincrono tubular para aplicacao na extracao de oleo (petroleo) subterraneo - MATAEOS

    Energy Technology Data Exchange (ETDEWEB)

    Rossini, Wagner Marques; Cruz, Jose Jaime da; Sales, Roberto Moura [Universidade de Sao Paulo (USP), SP (Brazil). Escola Politecnica. Lab. de Automacao e Controle (LAC)], e-mail: freddie@lac.usp.br, e-mail: jaime@lac.usp.br, e-mail: roberto@lac.usp.br; Alvarenga, Bernardo Pinheiro de; Chabu, Ivan Eduardo; Cardoso, Jose Roberto [Universidade de Sao Paulo (USP), SP (Brazil). Escola Politecnica. Lab.de Eletromagnetismo Aplicado (LMAG)], e-mail: bernardo@eee.ufg.br, e-mail: ichabu@pea.usp.br, e-mail: cardoso@pea.usp.br

    2008-06-15

    This study presents the development of a prototype Tubular Asynchronous Motor Application for Onshore Petroleum Exploitation - (MATAEOS). The principal function of the motor is to directly drive a suction pump installed in the down hole of an onshore well. Considering the installation and operational difficulties and costs of a traditional production system, known as a ''the walking beam and rod string system'', the developed prototype is intended to be a technical and economically viable alternative. The results obtained show that the motor develops a constant lift force throughout the movement (or pumping) cycle, according to the dynamometric charts. The motor also presented an electro-mechanical performance higher than the traditional systems. Furthermore, the motor completely eliminates the need for the actual system's set of hoists. Generally, the results indicate that the motor can advantageously substitute surface mechanical systems. (author)

  7. Application of an active current filter in the harmonics reduction in industrial electric systems; Aplicacion de un filtro activo de corriente en la reduccion de armonicos en sistemas electricos industriales

    Energy Technology Data Exchange (ETDEWEB)

    Reyes Trujillo, Eleazar

    2005-08-15

    In this work it is presented the pattern of an active filter of current and their implementation in the program Simulink of MatLab to reduce the content of harmonics generated for different non lineal load. For the active filter of current they were developed each one of the stages that integrate it, from the obtaining of references, the control block and the stage of power. For the obtaining of references, the reactivates instantaneous power theory was used. For the control of the shots of the IGBT's a control knot was used based on a hysteresis band and for the stage of power, an inversor complete bridge was used with a capacitor like source of direct voltage. To analyze the behavior of the active filter, a real industrial electric system was modeled with a lineal load RL and two non lineal load, a using a converter to diodes of 6 pulses and other a working of a machine of dc with a converter to tiristores of 6 pulses. These configurations were used because their content of harmonicas is high. To this system was integrated the active filter modeled in the exit of the non lineal load to avoid that the harmonic components generated by the loads non lineal distortions the current signals. The current signals, voltage signals, power flow, power factor and the harmonic components that circulate in the industrial electric system were analyzed. [Spanish] Actualmente, la presencia de equipos basados en electronica de potencia cuya operacion es no lineal, instalados en los sistemas electricos industriales, ha incrementado la presencia de distorsion en la senal de corriente y/o tension electrica por armonicos, originando problemas en la calidad de la energia electrica. Como una solucion a este problema, en este trabajo, se presenta el modelo de un filtro activo de corriente y su implementacion en el programa Simulink de MatLab para reducir el contenido de armonicos generados por diferentes cargas no lineales. Para el filtro activo de corriente se desarrollaron cada

  8. Microcomputer based sliding regime discrete control for synchronous AC motors Control discreto por microordenador basado en regímenes deslizantes para motores de corriente alterna síncronos

    Directory of Open Access Journals (Sweden)

    Eduardo Palomar–Lever

    2007-12-01

    Full Text Available The basic ideas to design discrete algorithms used to calculate unmeasured mechanical or electrical variables, in order to control electrical motors in mechanical systems are presented. The main point of the paper is to simplify the algorithms by using a linear discrete time model without any variable limitations and to reduce the computing capacity requirements of the controller. Limited references, based on the discrete sliding mode for the exception of the influences of variable limitations, are proposed and designed. The main advantage of the controller presented in this paper is that a large control error does not bestow any problems. In such a case, the system always works in an area without the limitations. Original observation algorithms of both position and rotational velocity for exterior permanent magnet synchronous motors are designed. A computer simulation was performed and the results are presented, showing high dynamic accuracy.Se presentan las ideas básicas para diseñar algoritmos discretos para calcular las variables mecánicas o eléctricas, no medidas sino estimadas, para controlar motores eléctricos en sistemas mecánicos. El objetivo principal de este artículo es simplificar los algoritmos usando un modelo de tiempo discreto lineal sin ninguna limitación en las variables y reducir los requisitos de capacidad informática del controlador. Las referencias limitadas, basadas en el modo deslizante discreto para la excepción de las influencias de limitaciones de las variables, se proponen y diseñan. La ventaja principal del controlador presentada en este artículo es que un error de control grande no causa ningún problema. En dicho caso, el sistema trabaja siempre en un área sin limitaciones. Se diseñan los algoritmos de la observación originales de la posición y de la velocidad rotatoria para el imán permanente exterior de motores síncronos. Se llevó a cabo una simulación en computadora y se presentan los

  9. Motores sincrónicos de reluctancia controlados con variadores de frecuencia: una aplicación para ahorrar energía ;Synchronous reluctance motors controlled by variable frequency converters: an application to save energy

    Directory of Open Access Journals (Sweden)

    Percy Rafael Viego Felipe

    2015-04-01

    Full Text Available Se presenta un estudio sobre aplicaciones de los motores sincrónicos de reluctancia (MSR controlados por accionamientos de frecuencia variable (AFV, que posibilitan el ahorro de energía. Se realizó una comparación entre las características constructivas de los MSR y los motores asincrónicos de jaula (MA, evaluando las ventajas y limitaciones que aquellos presentan. Una ventaja notable del MSR es que las pérdidas en el rotor se eliminan prácticamente. Una comparación experimental evidenció que para igual momento, el MSR presenta una mayor eficiencia; y que para igual incremento de temperatura, con las mismas dimensiones IEC, se logra más potencia. Por comparaciones entre datos de un fabricante, se demostró las ventajas de utilizar, con el mismo AFV y para cargas centrífugas, un MSR de mayor clase de eficiencia que la de un MA. Un análisis económico con técnicas de descuento, evidenció una atractiva recuperación de la inversión cuando se opera todo el año. A study on applications of synchronous reluctance motor (SynRM controlled by variable frequency drives (VFD for energy saving is presented. A comparison between the basic construction elements of the SynRM and the squirrel cage induction motor (IM is carried out, evaluating advantages and disadvantages. A nearly complete elimination of rotor losses is a significant asset of the SynRM. An experimental comparison showed that at the same torque, the SynRM presents a higher efficiency than the IM; and that at the same temperature rise, more power is obtained with the same IEC frame for both motor types. Comparing data from a manufacturer, the advantages of using, with the same VFD and for centrifugal loads, a higher efficiency class SynRM than that of a lower efficiency IM was demonstrated. An economical study using discount techniques, made evident an attractive pay back when operating all year around.

  10. Methodology for quantifying the technological level of energy in electric motors; Metodologia para quantificacao do nivel tecnologico energetico de motores eletricos

    Energy Technology Data Exchange (ETDEWEB)

    Konopatzki, Evandro Andre; Bianchessi, Joel Marcos [Faculdade Assis Gurgacz (FAG), Cascavel, PR (Brazil); Oliveira, Celso Eduardo Lins de [Universidade de Sao Paulo (FZEA-USP), Pirassununga, SP (Brazil). Fac. de Zootecnia e Engenharia de Alimentos; Konopatzki, Angelica da Silva Lima [Faculdade de Ciencias Aplicadas de Cascavel (FACIAP), PR (Brazil). Curso de Ciencia da Computacao; Marim, Cesar [Universidade Estadual do Oeste do Parana (UNIOESTE), Cascavel, PR (Brazil)

    2006-07-01

    The market competition created in agricultural industry because of its insertion in the domestic and foreign markets, verified by the increase in GDP share of agribusiness in the Brazilian GDP, led us to have better control of costs and inputs. Thus the final value of products sold by these agribusinesses can download increasing the space in the consumer market. Electricity is one of the inputs now being studied and this paper presents a model for determining the coefficients that allow the comparison of different existing technologies for electric motors inserting an indicator of technological innovation called Technological Level Energy (NTE). The NTE was developed and tested in Storage Units of Grain (UAG) in the region of Cascavel - Parana where data were collected in six UAG, analyzed in medium weighted, had levels of different energy technology development. The main elements used to create the NTE are the number of engines installed in UAG, the lifetime of the engine considered from its manufacture and motor plate data such as income and the power factor. As a comparative process, each region can create your NTE and analyze your situation in a national context. The UAG will use the NTE to technological innovation and planning projects such as depreciation, financing and cross-examination of financial resources for the exchange of electric motors. Thus the NTE will aid in comparative indication of the timing for replacement of electric motors. Moment from which the energy demand, according to the obsolescence of equipment, are considered excessive compared to other more modern UAG. (author)

  11. Una estrategia basada en modelos para el diagnóstico de fallas en el estator del motor de inducción

    Directory of Open Access Journals (Sweden)

    Cristian H. De Angelo

    2007-07-01

    Full Text Available Resumen: Se presenta una estrategia para el diagnóstico de fallas en el estator de los motores de inducción mediante la información contenida en las tensiones y corrientes de alimentación. La estrategia propuesta está basada en la generación de un vector de residuos específicos por medio de un observador de estados, el cual permite detectar la fase dañada y cuantificar el ńumero de espiras en cortocircuito. La estrategia de diagnóstico es muy poco sensible a los cambios de carga o perturbaciones de la red de alimentación tales como armónicos o desbalances. Palabras clave: Diagnóstico de fallas, fallas en el estator, motor de inducción

  12. La neuroplasticidad: una vía para elevar el desarrollo somestésico motor en las esgrimistas escolares villaclareñas

    Directory of Open Access Journals (Sweden)

    Erlys Álvarez Leal

    2007-03-01

    Full Text Available Formar una esgrimista con un alto desarrollo somestésico motor, implicaría que esta atleta logre una rapidez de reacción, de movimiento, un grado de coordinación y una efectividad en sus toques que se expresen en la mayor calidad del trabajo motor de ambos hemicuerpos. En este informe de investigación, el cual se encuentra en su tercer macrociclo de experimentación. Para esta investigación se utilizan un conjunto de tests específicos de la esgrima que se le aplican a las atletas con ambos hemicuerpos, al inicio, intermedio y final del macrociclo de entrenamiento estudiado 2004 – 2005, con el fin de caracterizar, comparar y valorar sus comportamientos y las principales influencias neurofisiológicas que tuvo este complejo de ejercicios sobre la actividad sensomotora de estas atletas en su desempeño deportivo.

  13. Diseño de un método para controlar la combustión en un motor 2T de gasolina basado en la medida del régimen instantáneo

    OpenAIRE

    PÉREZ PÉREZ, JUAN CARLOS

    2016-01-01

    [ES] En determinadas condiciones de operación los motores de 2T de gasolina operan con autoencendido de la mezcla, lo cual hace perder el control tradicional a través de la bujía. En esos casos es preciso conocer cuándo está teniendo lugar ese autoencendido, para así determinar si es necesario llevar a cabo alguna acción correctora para controlar que éste tenga lugar en el momento adecuado. El alumno explorará la posibilidad de utilizar la medida del régimen instantáneo del motor para consegu...

  14. Diseño y construcción de un motor virtual, para el diagnóstico de la ECU de un vehículo Chevrolet Spark

    OpenAIRE

    Mora Campoverde, José Enrique; Niola Barbecho, Fausto Lizandro

    2013-01-01

    Con la propuesta de este Motor Virtual se busca bajar los tiempos en el diagnóstico y eliminar la contaminación ambiental al comprobar el buen funcionamiento de la ECU del Vehículo Chevrolet Spark debido a que con este Motor Virtual se elimina encender el vehículo ya que el mismo consta de todos los sensores del motor y sus respectivos actuadores para saber si estos están funcionando en correctas condiciones o existe algún daño en los mismos. With Virtual Motor proposal this time is lookin...

  15. Benefits in the electrical systems through an energy efficiency program; Beneficios en los sistemas electricos a traves de un programa de eficiencia energetica

    Energy Technology Data Exchange (ETDEWEB)

    Kushler, M. (and others)

    2006-01-15

    The results of the search for electric efficiency programs providing savings during the hot summer days in the United States are presented. This search was named The Electric Energy Efficiency Programs Focused on Reliability and was executed in 50 states of the United States of America with the purpose of describing examples of successful programs that would help to guarantee the uninterrupted power supply, i.e. reliable by means of the consumer side demand management. Here the methodology of the project is described, the results of a discriminatory scrutiny of different programs in 50 states are presented, followed by a description of 22 programs of energy efficiency that were located as study cases along with the executive and legislative order measures taken to guarantee the reliability of the electric energy. [Spanish] Se presentan los resultados de la busqueda de programas de eficiencia energetica que proporcionen ahorros durante los dias calurosos del verano en Estados Unidos. Esta busqueda se titulo Los Programas de Eficiencia Energetica Enfocados a la Confiabilidad y fue realizada en 50 estados de la union americana con el objetivo de describir ejemplos de programas exitosos que ayudaran a garantizar un suministro electrico ininterrumpido, i. e. confiable por medio de una administracion de la demanda del lado del consumidor. Aqui se describe la metodologia del proyecto, se presentan los resultados de un escrutinio discriminatorio de diferentes programas en los 50 estados, seguidos de una descripcion de 22 programas de eficiencia energetica que se ubicaron como casos de estudio junto con las medidas de orden ejecutivo y legislativo tomadas para garantizar la confiabilidad de la energia electrica.

  16. Some future tendencies in the electric power systems; Algunas tendencias futuras en los sistemas electricos de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Sarmiento Uruchurtu, Hector Gerardo [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1996-12-31

    This document describes the most important tendencies on energy generation transmission and utilization of the electric power systems. The underlining of these tendencies has the purpose of maintaining a constant alert on the possible technological advances that must be covered at medium and long term in the Coordination Analysis of Transmission Systems [Espanol] En el presente documento se describen las tendencias mas importantes sobre generacion, transmision y utilizacion de la energia, en cuanto a los sistemas electricos de potencia. El destacar estas tendencias tiene por objeto una alerta constante sobre los posibles desarrollos tecnologicos que se deben abordar a mediano y largo plazo dentro de la Coordinacion de Analisis de Sistemas de Transmision

  17. Some future tendencies in the electric power systems; Algunas tendencias futuras en los sistemas electricos de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Sarmiento Uruchurtu, Hector Gerardo [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1995-12-31

    This document describes the most important tendencies on energy generation transmission and utilization of the electric power systems. The underlining of these tendencies has the purpose of maintaining a constant alert on the possible technological advances that must be covered at medium and long term in the Coordination Analysis of Transmission Systems [Espanol] En el presente documento se describen las tendencias mas importantes sobre generacion, transmision y utilizacion de la energia, en cuanto a los sistemas electricos de potencia. El destacar estas tendencias tiene por objeto una alerta constante sobre los posibles desarrollos tecnologicos que se deben abordar a mediano y largo plazo dentro de la Coordinacion de Analisis de Sistemas de Transmision

  18. Uso de un nuevo modelo CFD para la simulación de inyectores y chorros en condiciones de motor. Mejora y puesta en marcha

    OpenAIRE

    SOÑES BORI, JAVIER

    2016-01-01

    [ES] El estudio del proceso de inyección de combustible en los MCIA es fundamental para mejorar la eficiencia de la combustión, sobre todo en los motores de inyección directa. Debido a las duras condiciones de operación, realizar experimentos en condiciones reales es difícil y costoso, por eso se utilizan a menudo modelos computacionales. En este trabajo se propone usar un nuevo modelo capaz de simular el flujo en el interior de las toberas y en la cámara de combustión a la vez, un nuevo mode...

  19. Implantación del TPM en líneas semiautomáticas de motores eléctricos para la industria automovilística

    OpenAIRE

    Viñolo Serrano, Jorge

    2004-01-01

    El Proyecto final de carrera que desarrollo en el grupo Bosch, por medio del programa “Educació en Alternança” está encaminado a implantar el sistema o filosofía TPM (Mantenimiento Productivo Total) en unas líneas de producción de motores eléctricos para la industria automovilística, partiendo de un sistema de producción y mantenimiento “tradicional”, queriendo obtener finalmente un sistema tanto de producción como de mantenimiento “moderno”. El fin de implantar dicho sistema es, en primer lu...

  20. Study of overvoltages by phenomenon of ferroresonance in the substation Filadelfia of the Sistema Electrico Nacional

    International Nuclear Information System (INIS)

    Montealegre Lobo, Leonardo

    2012-01-01

    The mathematical analysis of the phenomenon of ferroresonance is far from easy especially when is looked an exact solution and is wanted to take into account all relevant considerations, that the characteristic of non-linearity has presented in this phenomenon. However, a series of appropriate simplifications are conducted and is possible simulate successfully variables of interest, in this case, voltages and currents. Personnel of the Area Proteccion y Medicion, Region Chorotega of the UEN Transporte Electrico (UEN TE) has approached the Centro de Investigacion en Sistemas de Potencia to be provided by a technical support in understanding (cause and possible mitigation) of a transient event that has caused the arrester output of the Subestacion Filadelfia after conducting an energization operation in said substation. The main supply by the personnel of the UEN TE has been the current measurement of fault recorder of differential protection of power transformer, the wave forms current are recorded 100 ms before, during and 200 ms after the occurrence of the event that has blown the lightning rods low side of the substation power transformer. Research has allowed to generate the simplifications needed to reconstruct the event occurred in substation in the absence of the voltage measurements of recorded event, the magnetization curve of the transformers, the electrical characteristics of underground cables and lightning rod present in the substation. Ranges are detailed on the determination of the reasons that have caused the explosion of lightning rods in the rod 13.8 kV of substation Filadelfia when maneuvering connection of electrical equipment for energization Ingenio El Viejo. Recommendations are offered for minimizing the effects caused by these maneuvers. (author) [es

  1. Network effects in the operation of electrical equipment; Efectos de la red en la operacion del equipo electrico

    Energy Technology Data Exchange (ETDEWEB)

    Garcia T, Arturo; Rosales S, Inocente; Garcia P, Job; Ruiz F, L. Ivan; Robles P, Edgar [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2005-07-01

    In the nineties, the Instituto de Investigaciones Electricas (IIE) Electrical Equipment Management (GEE) was restricted to make the diagnosis of generators, transformers, switch boards and cables, without considering the global operating conditions. With the experience acquired in different services it was verified that, inclusively when this equipment is correctly designed, it can be subjected to unfavorable operative conditions, which causes an accelerated deterioration to the degree of producing a fault. In agreement with this, the GEE settled down new line of development named Analysis of the network effect on the electrical equipment, that analyzes the behavior of the equipment originated by work abnormal causes, including the network configuration effect. [Spanish] En la decada de los noventa, la Gerencia de Equipos Electricos (GEE) del IIE se limitaba a realizar el diagnostico de generadores, transformadores, tableros de distribucion y cables, sin considerar las condiciones globales de operacion. Con la experiencia adquirida en diferentes servicios se comprobo que, inclusive cuando estos equipos esten correctamente disenados, pueden verse sometidos a condiciones de operacion desfavorables, lo que ocasiona un deterioro acelerado al grado de producir una falla. De acuerdo con esto, la GEE establecio una nueva linea de desarrollo de nominada Analisis del efecto de la red en los equipos electricos, que analiza el comportamiento de los equipos originado por causas anormales de trabajo, incluido el efecto de la configuracion de la red.

  2. Prospecção de talentos motores para rugby : proposta de modelo a de indicadores somatomotores

    OpenAIRE

    Eraldo dos Santos Pinheiro

    2014-01-01

    O objetivo da presente tese foi o de propor um modelo de identificação de características somatomotoras em escolares para a prospecção de possíveis talentos esportivos para o Rugby XV. Para tanto fizeram parte da amostra 195 escolares do sexo masculino com idades entre 16 e 17 anos e 32 atletas do sexo masculino da seleção brasileira de Rugby menores de 18 anos, subdividos em dois grupos Forwards (n=17) e Backs (n=15). Este estudo foi realizado a partir de uma base de dados de medidas e teste...

  3. Estimated losses of energy in a power system using a semi-statistical methodology; Estimacion de perdidas de energia en un sistema electrico de potencia mediante una metodologia semi-estadistica

    Energy Technology Data Exchange (ETDEWEB)

    Martinez Martinez, D [Centro Universitario UAEM, Valle de Teotihuacan (Mexico)]. E-mail: david_2mtz@hotmail.com; Martinez Lendech, J.F [Instituto Tecnologico de Estudios Superiores del Oriente del Estado de Hidalgo (Mexico)]. E-mail: mrtzlendech@hotmail.com; Garcia Herrera, C; Olvera Ricano, J.G. [Centro Universitario UAEM, Valle de Teotihuacan (Mexico)]. E-mails: cozobi_garcia@yahoo.com.mx; jgolverar@uaemex.mx

    2013-03-15

    Determination of electrical losses is one of the most important tasks for any enterprise dedicated to generation, transmission, transformation and/or distribution of electric energy. Any enterprise dedicated to these activities does continuously energy balances in order to estimate whole electrical losses of specific processes. However, it is necessary to classify the whole electrical losses into technical and non-technical losses. This paper presents a proposal for estimating technical and non-technical losses in an electrical power system. [Spanish] La determinacion de las perdidas de energia electrica es una de las labores mas importantes en cualquier empresa dedicada a la generacion, transmision, transformacion y/o distribucion de energia electrica. Es indudable que toda empresa dedicada a cualquiera de las actividades mencionadas anteriormente realiza periodicamente balances de energia que permiten estimar el valor de las perdidas totales de energia del proceso considerado. No obstante, para poder realizar un mejor analisis de la problematica de las perdidas de energia, es necesario separar el valor total de perdidas obtenido mediante un balance de energia, en perdidas tecnicas y perdidas no tecnicas. El presente trabajo presenta una propuesta para la estimacion de perdidas tecnicas y no tecnicas en un sistema electrico de potencia.

  4. Utilización de la zeolita para disminuir los gases tóxicos de los motores de combustión interna. // The utilization of Cuban zeolites in the decrease of toxic gases emissions of internal combustion engines.

    Directory of Open Access Journals (Sweden)

    J. L. Reyes González

    2003-01-01

    Full Text Available En el trabajo se presentan los resultados obtenidos al utilizar la zeolita natural cubana para la disminución de los gasestóxicos que los motores de combustión interna MCI. envían a la atmósfera. Los experimentos fueron realizados en bancosde pruebas de MCI. tanto para motores de carburación como para motores diesel. Obteniéndose eficiencias de disminucióndel CO del 80 %, del CnHm del 50% y el humo negro en un 90%. Se demuestra la importancia de la granulometría de lazeolita para esta eliminación y para mantener la potencia del motor dentro de rangos aceptables.Palabras claves: Toxicidad, zeolita, medio ambiente, filtros, gases de escape._______________________________________________________________________________Abstract.In this paper are presented the results of the utilization of Cuban zeolites in the decrease of toxic gas emissions toatmosphere of internal combustion engines, (MCI. The experiments were carried out in test bank for gasoline and dieselengines. The efficiency in the decrement of CO was of 80%, CnHm in 50%, and 90 % in soot. The size of the zeolitesparticle importance in the efficiency is demonstrated.Key words: Toxicity, zeolite, enviroment, filters, gas emissions.

  5. Sistema Recomendador para áreas de: Ventas/Mercadotecnia de Yamaha Motor de México

    OpenAIRE

    Cueva-Morales, Gabriela

    2017-01-01

    This work is the documentation of the experiment: Recommender System for Sales or Marketing departments of Yamaha Motor de México, which recommends products to offer to the company´s dealers, in this work is the detailed procedure to solve the company's problem using Artificial Intelligence, and it shows the theoretical framework in which this development is encompassed, describes briefly the Neighborhood-Based Collaborative Filtering and analyze the steps to the construction of a Recommender...

  6. Procedimiento para el cálculo de los parámetros de un modelo térmico simplificado del motor asincrónico Parameter estimation procedure for an asynchronous motor simplified thermal model

    Directory of Open Access Journals (Sweden)

    Julio R Gómez Sarduy

    2011-06-01

    Full Text Available En este trabajo se presenta un método para estimar las conductancias y capacitancias de un modelo térmico simplificado del motor asincrónico, utilizando una técnica de baja invasividad. El procedimiento permite predecir el incremento de temperatura del estator del motor asincrónico, tanto para régimen dinámico como en condiciones de estabilidad térmica. Se basa en la estimación paramétrica mediante un modelo de referencia, utilizando como optimizador un algoritmo genético (AG. Se logra en definitiva obtener los parámetros del modelo térmico con un ensayo más sencillo que lo requerido por otros métodos experimentales complejos o cálculos analíticos basados en datos de diseño. El procedimiento propuesto se puede llevar a cabo en condiciones propias de la industria y resulta atractivo su empleo en el análisis de calentamiento de estas máquinas. El método se valida a partir de un estudio de caso reportado en la literatura y se aplica a un caso real en la industria, lográndose una buena precisión.In this paper, an asynchronous motor simplified thermal model method for conductances and capacitances estimation is presented. A low invasive technique is used. The developed procedure allows the stator temperature rise prediction, not only for dynamic regimes, but also in case of thermal stability. A parametric estimation is done through a reference model, using a genetic algorithm (GA as optimizing method. The thermal model parameters are finally obtained with an easer experimental work, than the required by other complex experimental methods or by analytical calculations based on design data. The proposed procedure can be carry out in the particular conditions of industrial environment. Its application is specially useful for asynchronous machine thermal analysis. Using the data of a study case reported in literature, the method validation is done, and is applied in an industrial real case, with good precision resulted from it.

  7. Estimation of charges for services of transmission of electrical energy between regions of the national electrical system; Estimacion de cargos por servicios de transmision de energia electrica entre regiones del sistema electrico nacional

    Energy Technology Data Exchange (ETDEWEB)

    Inda Ruiz, Adrian; Flores Alba, Dora Elia [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Escobar Lopez, Akihito [Comision Federal de Electricidad (Mexico)

    2002-07-01

    In order to facilitate the answer of the Comision Federal de Electricidad (CFE) to the requests of services of transmission of authorized or potential licensees, this organism devised the construction of matrices of charges that allow in a fast and direct way for specific transactions, to know the charges in which different types of transmission services incur classified by transport levels and by tension levels in which the service is asked for. These tables could be published in the media that might be judged advisable, in order that the applicant licensees have access to a preliminary estimation of the charges for the required services, without the need of going, for one first estimation, directly to the CFE for their calculation. This article presents the results of the development of a calculation tool that allows estimating, in a fast and efficient way, charges for transmission services between regions of the national electrical system. [Spanish] Para facilitar la respuesta de la Comision Federal de Electricidad (CFE) a las solicitudes de servicios de transmision de permisionarios autorizados o potenciales, esta ideo la construccion de matrices de cargos que permitan de manera rapida y directa para transacciones especificas, conocer los cargos en que incurren diferentes tipos de servicios de transmision clasificados por niveles de transporte y por niveles de tension en los que se solicita el servicio. Dichas tablas podran ser publicadas en los medios que se juzguen convenientes, con el fin de que los permisionarios solicitantes tengan acceso a una estimacion preliminar de los cargos por los servicios requeridos, sin necesidad de acudir, para una primera estimacion, directamente a la CFE para su calculo. Este articulo presenta los resultados del desarrollo de una herramienta de calculo que permite estimar, de manera rapida y eficiente, matrices de cargos por servicios de transmision entre regiones del sistema electrico nacional.

  8. Generating units in operation. National electrical system (Public service) 2002; Unidades generadoras en operacion. Sistema electrico nacional (Servicio publico) 2002

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2003-03-15

    The information regarding the generation effective capacity updated to December 31, 2002 is presented. A detailed description of the effective capacity by generation region, control area, generation type and federal entity is presented. Also graphs are shown with the energy balance of the National Electrical System of Comision Federal de Electricidad and Luz y Fuerza del Centro. [Spanish] Se presenta la informacion relativa a la capacidad efectiva de generacion actualizada al 31 de diciembre de 2002. Se hace una descripcion detallada de la capacidad efectiva por region de generacion, por area de control, por tipo de generacion y por entidad federativa. Tambien se presentan unas graficas con el balance de energia del Sistema Electrico Nacional de la Comision Federal de Electricidad y de Luz y Fuerza del Centro.

  9. Potencial para el uso directo de los aceites vegetales en los motores de combustión

    OpenAIRE

    Ortiz Laurel, Hipólito; Rössel Kipping, Dietmar; Schümann, Ulrike

    2012-01-01

    Los combustibles fósiles son aquellos que provienen de restos orgánicos vegetales y animales y se extraen de la naturaleza. Estos combustibles son contaminantes del medio ambiente a través de los gases que salen de los motores de combustión. El biodiesel es un combustible de origen vegetal obtenido a partir de los aceites vegetales de semillas, plantas y algas oleaginosas. El biodiesel es menos contaminante que los combustibles fósiles. Este trabajo presenta una revisión de las propiedades en...

  10. Jidosha's Motors

    OpenAIRE

    Shirakawa Okuma, Rosely; Calderón Orejuela, Javier

    2016-01-01

    La tesis narra la situación de una empresa concesionaria de vehículos nuevos, Jidosha's Motors, perteneciente a una corporación japonesa que cuenta con una cultura muy arraigada de ética y de cumplimiento. Se plantean respuestas, se identifican problemas y sus alternativas de solución para una toma adecuada de decisiones por parte de los directivos, siguiendo una estructura de análisis de situaciones de negocios (ASN). Tesis

  11. High efficiency motors; Motores de alta eficiencia

    Energy Technology Data Exchange (ETDEWEB)

    Uranga Favela, Ivan Jaime [Energia Controlada de Mexico, S. A. de C. V., Mexico, D. F. (Mexico)

    1993-12-31

    This paper is a technical-financial study of the high efficiency and super-premium motors. As it is widely known, more than 60% of the electrical energy generated in the country is used for the operation of motors, in industry as well as in commerce. Therefore the importance that the motors have in the efficient energy use. [Espanol] El presente trabajo es un estudio tecnico-financiero de los motores de alta eficiencia y los motores super premium. Como es ampliamente conocido, mas del 60% de la energia electrica generada en el pais, es utilizada para accionar motores, dentro de la industria y el comercio. De alli la importancia que los motores tienen en el uso eficiente de la energia.

  12. High efficiency motors; Motores de alta eficiencia

    Energy Technology Data Exchange (ETDEWEB)

    Uranga Favela, Ivan Jaime [Energia Controlada de Mexico, S. A. de C. V., Mexico, D. F. (Mexico)

    1992-12-31

    This paper is a technical-financial study of the high efficiency and super-premium motors. As it is widely known, more than 60% of the electrical energy generated in the country is used for the operation of motors, in industry as well as in commerce. Therefore the importance that the motors have in the efficient energy use. [Espanol] El presente trabajo es un estudio tecnico-financiero de los motores de alta eficiencia y los motores super premium. Como es ampliamente conocido, mas del 60% de la energia electrica generada en el pais, es utilizada para accionar motores, dentro de la industria y el comercio. De alli la importancia que los motores tienen en el uso eficiente de la energia.

  13. Diseño y optimización del sistema de renovación de la carga de un motor dual fuel para transporte pesado mediante sobrealimentación en doble etapa

    OpenAIRE

    SIRVENT SANJOSÉ, ROBERTO ANDRÉS

    2016-01-01

    El trabajo consiste en el diseño del sistema de admisión y escape de un motor dual-fuel para transporte pesado. Se deberá seleccionar la arquitectura adecuada para poder conseguir las condiciones de deseadas en el interior del cilindro (sistema de sobrealimentación, producción de EGR). Se deberá también seleccionar la estrategia adecuada para el control de cada uno de los elementos utilizados. Sirvent Sanjosé, RA. (2016). Diseño y optimización del sistema de renovación de la carga de un mo...

  14. Bases de datos, motores de búsqueda e índices temáticos: herramientas fundamentales para el ejercicio médico

    Directory of Open Access Journals (Sweden)

    Jaime A. Castrillón-Estrada

    2008-01-01

    Full Text Available Con la diseminación del Internet han cambiado las formas tradicionales de transmisión y adquisición del conocimiento en todas sus ramas; y la medicina, como una disciplina de constantes cambios, no ha sido ajena a esta tecnología. Tras el advenimiento de la informática, las ciencias biológicas y médicas han encontrado un medio eficiente para la globalización del conocimiento, lo cual ha mejorado el entrenamiento y la actualización de los estudiantes y profesionales de la medicina, y ha creado la necesidad de aumentar la eficiencia de estos medios de comunicación. Con el objetivo de facilitar el acceso a la información científica a través de medios informáticos han sido desarrolladas plataformas encargadas de recopilar la información en forma de bases de datos, las cuales pueden ser consultadas a través de otra tecnología emergente como los son los motores de búsqueda. Debido a que cada sitio Web tiene características específicas que le confieren ciertas fortalezas y debilidades, tanto el estudiante como el profesional médico deben reconocerlas, para así obtener el mayor provecho de su utilización.

  15. Software para la determinación del comportamiento de un motor asincrónico trifásico

    Directory of Open Access Journals (Sweden)

    Héctor Brito Socarrás

    2011-02-01

    Full Text Available El motor asincrónico trifásico es uno de los convertidores más empleados en la industria, por lo cual es de unagran necesidad conocer el comportamiento de estas máquinas. Esto se puede valorar a través de las característicasde operación. Este tipo de máquina en ocasiones sufre averías, por lo cual tienen que ser reparadas y enmuchas situaciones posteriormente determinar nuevamente sus características de operación. En el presentetrabajo  se  elabora  un  paquete  de  programas  de  computación  que  permite  obtener  las  características  de:comportamiento contra potencia de salida y comportamiento en un punto de trabajo.  The asynchronous tree-phases motor is one of the converters more employee in the industry, reason why is of agreat necessity to know the behavior of these machines. This you can value through the operation characteris-tics. This machine type in occasions suffers mishaps, reason why they have to be repaired and in many situa-tions after the same ones is necessary to determine its operation characteristics again.  Presently work iselaborated a package of calculation programs that allows to obtain the characteristics of: of behavior against exitpower and their behavior in a work point.

  16. Transient stability studies on industrial power systems interconnected to the transmission grid; Estudios de estabilidad transitoria en sistemas electricos industriales con generacion propia interconectaos con el sistema de transmision

    Energy Technology Data Exchange (ETDEWEB)

    Calderon Guizar, J.G. [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: jgc@iie.org.mx

    2010-10-15

    Aiming to ensure continuity in the electrical supply to critical processes, the electrical systems of large industrial plants, i.e. gas, and petrochemical industries usually posses local generation. Should the local generation be enough to satisfy the demand of the plant, then the interconnection with the public grid is commonly used as an important support for emergency conditions. This paper is concerned with the dynamical performance of two interconnected industrial power systems tied to the transmission system. Simulation results indicate that the frequency performance of one of the industrial plants, after the transients caused by the loss of the tie with the transmission system have died out, is greatly improved if both industrial plants remain connected after the disturbance. [Spanish] La continuidad en el suministro de energia electrica a procesos criticos de grandes complejos industriales, tales como plantas petroquimicas, procesadoras de gas, etc., es un aspecto de fundamental importancia para garantizar una operacion adecuada de este tipo de complejos. Con el proposito de mejorar la confiabilidad en el suministro de energia a los procesos criticos, los sistemas electricos de estos complejos industriales, generalmente cuentan con generacion propia. Si la capacidad de generacion instalada en los sistemas industriales es suficiente para satisfacer el total de la carga del complejo, la interconexion con el sistema de transmision es utilizada principalmente como respaldo durante condiciones de emergencia. En este articulo se analiza el comportamiento dinamico de dos sistemas industriales con generacion propia, disenados para operar en forma aislada, interconectados entre si, a traves de un enlace de 115 kV y con el sistema de transmision. Los resultados obtenidos indican que el comportamiento de la frecuencia en estado estable en uno de los complejos, posterior a la perdida del enlace con el sistema de transmision, mejora de manera considerable cuando estos

  17. Elaboración de un motor de animación 3D para three.js

    OpenAIRE

    Chico García, David Pedro

    2017-01-01

    La industria de los videojuegos, a la par que el mundo de la informática, ha experimentado una creciente evolución en los últimos años, llegando a convertirse en una de las más grandes del mundo del entretenimiento. Los videojuegos han demostrado ser una potente herramienta de entretenimiento, a la vez que una forma de expresión personal para artistas y creativos totalmente nueva. Desde mi perspectiva una de las cosas más bonitas que ofrece la informática a la humanidad es una capacidad creat...

  18. Advantages and disadvantages in the use of a variable system velocity-motor; Ventajas y desventajas en el uso de un sistema variador de velocidad-motor

    Energy Technology Data Exchange (ETDEWEB)

    Nunez Perez, J. [Baldor de Mexico (Mexico)

    1997-12-31

    At present every time is more costly to generate the electric power utilized in all of the aspects of our society. The energy savings by means of a variable velocity device is focussed to the industrial sector, where the electric motor consumes a significant part of the total electricity utilized. The electric power suffers losses right from its generation stage, then through the transmission stage by means of the distribution networks and its conversion into mechanical energy. From these losses the more important ones are the first and the last stage, therefore the end users have a great savings potential by optimizing their electric power consumption. Evidently, the use of variable velocity devices in A.C. (also known as inverters o frequency variators) as well as in D.C. or rectifiers, have disadvantages, such as the generation of harmonics and noise on the power transmission lines inside the factory as well as in the city power lines. This paper discusses the savings that can be obtained by he use of these devices and how to counteract their disadvantages. [Espanol] En la actualidad es cada vez mas costoso producir la energia electrica que se utiliza en todos los aspectos de nuestra sociedad. El enfoque de ahorro de energia usando un variador de velocidad para motores, sera el sector industrial, donde los motores electricos constituyen una parte importante del consumo de electricidad. La energia electrica sufre perdidas desde su etapa de generacion, en su etapa de transmision por medio de redes de distribucion y en su transformacion a energia mecanica. De estas perdidas, las mas cuantiosas son la primera y la ultima etapa, por lo que los usuarios finales tienen un gran potencial de ahorro si optimizan su consumo de energia electrica. Por supuesto que el uso de variadores de velocidad tanto de C.A. (tambien conocidos como inversores o variadores de frecuencia), como de C.D. o rectificadores, tiene algunas desventajas, tal es el caso de la generacion de armonicas

  19. Advantages and disadvantages in the use of a variable system velocity-motor; Ventajas y desventajas en el uso de un sistema variador de velocidad-motor

    Energy Technology Data Exchange (ETDEWEB)

    Nunez Perez, J [Baldor de Mexico (Mexico)

    1998-12-31

    At present every time is more costly to generate the electric power utilized in all of the aspects of our society. The energy savings by means of a variable velocity device is focussed to the industrial sector, where the electric motor consumes a significant part of the total electricity utilized. The electric power suffers losses right from its generation stage, then through the transmission stage by means of the distribution networks and its conversion into mechanical energy. From these losses the more important ones are the first and the last stage, therefore the end users have a great savings potential by optimizing their electric power consumption. Evidently, the use of variable velocity devices in A.C. (also known as inverters o frequency variators) as well as in D.C. or rectifiers, have disadvantages, such as the generation of harmonics and noise on the power transmission lines inside the factory as well as in the city power lines. This paper discusses the savings that can be obtained by he use of these devices and how to counteract their disadvantages. [Espanol] En la actualidad es cada vez mas costoso producir la energia electrica que se utiliza en todos los aspectos de nuestra sociedad. El enfoque de ahorro de energia usando un variador de velocidad para motores, sera el sector industrial, donde los motores electricos constituyen una parte importante del consumo de electricidad. La energia electrica sufre perdidas desde su etapa de generacion, en su etapa de transmision por medio de redes de distribucion y en su transformacion a energia mecanica. De estas perdidas, las mas cuantiosas son la primera y la ultima etapa, por lo que los usuarios finales tienen un gran potencial de ahorro si optimizan su consumo de energia electrica. Por supuesto que el uso de variadores de velocidad tanto de C.A. (tambien conocidos como inversores o variadores de frecuencia), como de C.D. o rectificadores, tiene algunas desventajas, tal es el caso de la generacion de armonicas

  20. Nuclear energy and opportunity to strengthen the sustainable electricity sector; Energia nuclear una oportunidad para fortalecer el sector electrico sustentable

    Energy Technology Data Exchange (ETDEWEB)

    Robles N, A. G. [Comision Federal de Electricidad, Direccion de Proyectos de Inversion Financiada, Gerencia de Proteccion Ambiental, Paseo de la Reforma No. 164, Col. Juarez, 06600 Ciudad de Mexico (Mexico)

    2016-09-15

    The beginning of electricity in Mexico was through the use and exploitation of natural resources; as the demand grew, more generation power plants were required with great capacity and at the same time the fuels used varied, although, oil continued to be the main fuel. At present, due to the effects of climate change, the Conference of the Parties has proposed to reduce the consumption of fossil fuels to give way to clean energy (wind, solar, geothermal, nuclear, etc.), which entails gradually modifying the energy matrix of the electricity sector. The National Development Plan and the National Electricity Sector Development Program, this coordinated by the Energy Secretariat in Mexico, establish policies to promote sustainable development, increasing electricity generation through clean energy sources, including nuclear energy. However, such plans are not accurate in the strategy to be followed to ensure compliance with the increased participation of nuclear energy. This article proposes a nuclear program for the Mexican electricity sector, under the terms of a State policy, aimed at crystallizing a sustainable electricity development 2015-2036; considering that the application to the electricity sector constitutes a representative and justified example of the incorporation of environmental aspects in decision processes for the preservation of the environment. In order to determine the quantity and type of reactors, as well as the number of nuclear power plants and increase of the installed capacity, the general planning scheme of the electric sector was used, taking as reference the modeling criteria of the WASP planning system. Finally, is concluded that the electricity generated by fission of radioactive elements is an opportunity to fulfill the commitments made by Mexico at COP 21 and to meet in an environmentally friendly way the energy requirement that our country needs. (Author)

  1. The argentine electric sector reform and its correlation with energy efficiency; La reforma del sector electrico argentino y su relacion con la eficiencia energetica

    Energy Technology Data Exchange (ETDEWEB)

    Carpio, Claudio [MGM International (Argentina)

    2005-04-15

    The reforms in the Argentine electrical sector and the effect these have originated in the energy efficiency policies for public sector are presented. The characteristics exposed of the Argentina Electric sector previous to the 1992 transformation are the departing base that gave rise to the reform fundaments, generating privatizations and a vertical economic scheme. The transformation of the electric sector departing from its environmental regulations yielded in a quality service, good electricity distribution, better prices and proper energy efficiency. [Spanish] Se presentan las reformas en el sector electrico argentino y el efecto que han tenido sobre las politicas de eficiencia energetica elaboradas en el sector publico. Las caracteristicas expuestas del sector electrico argentino previas a la transformacion de 1992 son la base de partida que dio lugar a los fundamentos de la reforma generando privatizaciones y un esquema economico vertical. La transformacion del sector electrico a partir de sus regulaciones energeticas y ambientales redituaron en calidad de servicio, de distribucion de electricidad, precios y en la propia eficiencia energetica.

  2. Los cuentos motores como herramienta pedagógica para la educación infantil y primaria

    Directory of Open Access Journals (Sweden)

    Julia Iglesia

    2012-04-01

    Full Text Available Hoy día, la sociedad plural y cambiante hace que hayan evolucionado valores que antes eran fundamentales. Como comenta Esteve (1995: 280 “frente a la mentalidad contemporánea del filiteísmo, que sólo valora vivir a lo grande, los profesores necesitamos recuperar el sentido de la grandeza oculto en la sabiduría”. Priorizamos objetivos y valores que ahora son “más importantes” por otros que lo son menos. Modificamos muchos aspectos en la enseñanza pero la forma, el modo de conseguirlo puede ser la de siempre, la tradicional que ha dado resultados positivos. A través de juegos y cuentos motores alcanzamos dichos fines. Juegos de siempre o que nuestras generaciones han practicado. Juegos que huyen de máquinas externas, de juegos digitales, de videojuegos... y que a través de simulaciones y dramatizaciones consiguen los efectos deseados.

  3. Modeling and simulation of the generation automatic control of electric power systems; Modelado y simulacion del control automatico de generacion de sistemas electricos de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Caballero Ortiz, Ezequiel

    2002-12-01

    . [Spanish] Este trabajo es dedicado al analisis del Control Automatico de Generacion de Sistemas Electricos de Potencia, a partir de la informacion que generan el lazo de Control Carga Frecuencia y el lazo del Regulador Automatico de Voltaje. Para realizar el analisis, se aplican los conceptos teoricos y fisicos del control automatico de generacion; dividiendolo en los lazos de control carga frecuencia y regulador automatico de voltaje. Se establecen los modelos matematicos de los dos lazos de control. Posteriormente se interconectan los modelos de los elementos para integrar el lazo de control carga frecuencia y se lleva a cabo la simulacion digital del sistema. Se analizan en primera instancia la funcion del control primario en sistemas de potencia de un area - una maquina, un area - multimaquina y multiarea - multimaquina. Posteriormente se estudia el control automatico de generacion de los sistemas de potencia de un area y multiarea. Se establece el concepto de despacho economico y con este esquema se simula el sistema de potencia multiarea, posteriormente se estudia el intercambio de energia entre areas en estado estacionario. Se interconectan los modelos matematicos de los elementos componentes del lazo de control del regulador automatico de voltaje, se generan datos de acuerdo a la naturaleza de cada componente y se simula su comportamiento para analizar la respuesta del sistema. Se interconectan los dos lazos de control y se realiza una simulacion con los datos generados anteriormente, examinando el desempeno del control automatico de generacion y la interaccion entre los dos lazos de control. Finalmente se aplican las tecnicas de Posicionamiento de Polos y el Control Optimo, de la teoria moderna de control, al control automatico de generacion de un area.

  4. Estudio e implementación de un sistema Dual para optimizar la combustión de un motor Otto mediante el uso de gas de Brown (HHO)

    OpenAIRE

    Cujilema Cujilema, José Sebastián; Ramírez Gonzaga, Carlos Manuel

    2011-01-01

    La implementación de un sistema Dual para optimizar la combustión de un motor Otto surge debido a que existen millones de vehículos a gasolina circulando por el mundo y cada uno de ellos es una fuente de contaminación y consumo. En ciudades grandes la contaminación de estos vehículos presentan altos índices de gases nocivos para la salud y el medio ambiente. Los altos índices de emisiones contaminantes están determinados por algunos factores como la mala calidad del combustible, la falta d...

  5. Diseño e implementación de maletas didácticas con los mini PLCS logo y Zelio para aplicaciones de arranque e inversión de giro de motores.

    OpenAIRE

    Hermenegildo Cedeño, Byron Jose; Orellana Apolinario, Andrés Octavio

    2015-01-01

    La presente tesis: “Diseño e implementación de maletas didácticas con mini plc logo para aplicaciones de arranque e inversión de giro de motores” representa el desarrollo de tres módulos didácticos de pruebas para que los estudiantes fortalezcan sus conocimientos teóricos en la parte práctica implemantando y reconociendo el comportamiento de diferentes tipos de actuadores existentes en el mercado como lo son: contactares, guarda motores, temporizadores, LOGOs programables. Este trabajo b...

  6. Consumo de combustível e emissões de poluentes em um motor Diesel convertido a etanol para geração térmica de energia elétrica

    Directory of Open Access Journals (Sweden)

    Vinícius Rückert Roso

    2016-03-01

    Full Text Available Nos esforços globais para a minimização nas emissões de gases do efeito estufa e redução da pegada de carbono, combustíveis renováveis têm sido extensivamente utilizados em substituição aos combustíveis fósseis nos motores de combustão interna. Particularmente para geração de energia elétrica local, motores diesel são os mais utilizados devido à elevada eficiência térmica e a robustez, se comparado a motores de ignição por centelha. Entretanto, estes sistemas apresentam elevados níveis de emissões de óxido de nitrogênio (NOx e material particulado, trazendo sérias consequências para o meio ambiente. Assim, esta pesquisa combina simulação computacional e resultados experimentais da conversão de um motor diesel para a operação com etanol, sendo sua utilização na geração de energia elétrica. Como este combustível renovável é largamente produzido no Brasil utilizando a cana-de-açúcar, acaba por possuir seu custo reduzido em especial próximo à produtores e refinarias. Dados experimentais foram utilizados na validação do modelo computacional unidimensional desenvolvido para a conversão, onde resultados foram analisados para a comparação de ambos combustíveis. Análises econômicas para diferentes condições de carga forneceram informações de custos operacionais em locais próximos às fontes de produção de etanol. Os resultados apontam as vantagens no uso do combustível renovável para a geração de energia elétrica, como o custo reduzido e a menor emissão de NOx ao longo de toda a gama de operação.

  7. Deteriorating mechanisms of electric generators; Mecanismos de deterioro de generadores electricos

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Tevillo, Arturo; Reyes Martinez, Oscar Alfonso; Robles Pimentel, Edgar Guillermo; Esparza Saucedo, Marcos; Lopez Azamar, Jose Ernesto; Medina Flores, Alfredo; Uribe Martinez, Manuel O [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1999-12-31

    It is of the greatest importance to know the deteriorating mechanisms that an electric generator undergoes, in order to take corrective measures to stop the process in order to avoid catastrophic damages that imply non scheduled interruptions for maintenance, or inclusively, to carry on the overhaul. In this paper are discussed the deteriorating mechanisms that have been found in the stator (winding and core) and the rotor of thermoelectric and hydroelectric power stations by the natural aging process and abnormal operation. [Espanol] Es de suma importancia conocer los mecanismos de deterioro que sufre un generador, para tomar medidas correctivas que detengan el proceso, con el fin de evitar danos catastroficos que impliquen salidas no programadas para dar mantenimiento, o incluso, para efectuar la rehabilitacion. En este articulo se discuten los mecanismos de deterioro que se han encontrado en el estator (devanado y nucleo) y el rotor de generadores termicos e hidroelectricos por el proceso natural de envejecimiento y por operacion anormal.

  8. Deteriorating mechanisms of electric generators; Mecanismos de deterioro de generadores electricos

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Tevillo, Arturo; Reyes Martinez, Oscar Alfonso; Robles Pimentel, Edgar Guillermo; Esparza Saucedo, Marcos; Lopez Azamar, Jose Ernesto; Medina Flores, Alfredo; Uribe Martinez, Manuel O. [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1998-12-31

    It is of the greatest importance to know the deteriorating mechanisms that an electric generator undergoes, in order to take corrective measures to stop the process in order to avoid catastrophic damages that imply non scheduled interruptions for maintenance, or inclusively, to carry on the overhaul. In this paper are discussed the deteriorating mechanisms that have been found in the stator (winding and core) and the rotor of thermoelectric and hydroelectric power stations by the natural aging process and abnormal operation. [Espanol] Es de suma importancia conocer los mecanismos de deterioro que sufre un generador, para tomar medidas correctivas que detengan el proceso, con el fin de evitar danos catastroficos que impliquen salidas no programadas para dar mantenimiento, o incluso, para efectuar la rehabilitacion. En este articulo se discuten los mecanismos de deterioro que se han encontrado en el estator (devanado y nucleo) y el rotor de generadores termicos e hidroelectricos por el proceso natural de envejecimiento y por operacion anormal.

  9. World tendencies in the disintegration of the electric systems; Las tendencias mundiales a la desintegracion de los sistemas electricos

    Energy Technology Data Exchange (ETDEWEB)

    Viqueira Landa, Jacinto [Facultad de Ingenieria, Universidad Nacional Autonoma de Mexico (UNAM), Mexico, D. F. (Mexico)

    1997-12-31

    This paper describes the organizational changes of the electric industry, accomplished or in the process of being implemented in various countries encompassing from the modality of the independent power producers with which the competitiveness at production level is pretended to be introduced, until the total disintegration of the electric systems by means of the separation of the generation, transmission and distribution functions and the intent of implementing the access of third parties to the transmission network. Finally, the risks that these reforms imply from the stand point of service quality and the environmental protection are pointed out [Espanol] En esta ponencia se describen los cambios de organizacion de la industria electrica, realizados o en vias de implantarse en varios paises, abarcando desde la modalidad de las empresas generadoras independientes con la que se pretende introducir la competencia al nivel de la produccion, hasta la desintegracion total de los sistemas electricos mediante la separacion de las funciones de generacion, transmision y distribucion, y la pretension de implantar el acceso de terceros a la red de transmision. Finalmente se senalan los riesgos que implican estas reformas desde el punto de vista de la calidad del servicio y de la preservacion del medio ambiente

  10. Reliability optimization in compound electric power systems with the aid of evolutionary algorithms; Optimizacion de la confiabilidad en sistemas electricos de potencia compuestos utilizando algoritmos evolucionarios

    Energy Technology Data Exchange (ETDEWEB)

    Gomez Hernandez, Jose Alberto

    2001-11-15

    and branches, that contributes the most to the voltage collapse or singular point. The obtained results show the feasibility of the proposed algorithm for optimization of reliability considering conditions of security. The tested systems used are: Reliability test system of 24 nodes of the IEEE, Roy Billinton test system of 6 nodes and eastern area equivalent of the Mexican grid of 31 nodes of the Comision Federal de Electricidad. [Spanish] El proposito de evaluar la confiabilidad de Sistemas Electricos de Potencia (SEP) es para estimar la habilidad del sistema para desempenar su funcion de llevar la energia de las estaciones generadoras a los puntos de carga. Esto involucra la confiabilidad de fuentes de generacion y medios de transmision que afecta en la transferencia de potencia a traves del sistema de transmision que conlleva a perdida de carga y caidas de voltaje entre la generacion y los centros de consumo. En esta tesis se desarrolla una metodologia hibrida que optimiza la confiabilidad en sistemas compuestos (generacion-transmision) utilizando algoritmos evolucionarios. Esta tecnica de optimizacion determina el numero optimo de componentes (redundancia paralela en lineas de transmision) y asignacion de compensacion en derivacion en nodos de carga de la red necesarios para maximizar la confiabilidad sujeta a restricciones de costo, considerando condiciones de seguridad en estado estacionario usando la tecnica del minimo valor singular (MVS) como indicador a la inestabilidad de voltaje. La funcion objetivo se define como una funcion estocastica, donde la medida de interes es el MVS de la matriz Jacobiana de flujos de potencia del evento mas severo de acuerdo a la evaluacion de confiabilidad del sistema compuesto, esta formulacion es una combinacion de programacion no lineal entera y continua, donde los algoritmos convencionales de programacion matematica presentan dificultades en robustez y en la busqueda del optimo global. Los eventos de falla de las unidades

  11. Characterization of the voltage control systems and speed of a synchronous machine of high power for short circuit testing; Caracterizacion de los sistemas de control de voltaje y velocidad de una maquina sincrona de alta potencia para pruebas de corto circuito

    Energy Technology Data Exchange (ETDEWEB)

    Segura Ozuna, Victor Octavio; Hernandez Rodriguez, Isaura Victoria; Alcaide Godinez, Indira Xochiquetzal; Garduno Ramirez, Raul; Montero Cervantes, Julio Cesar [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Ruiz Rodriguez, Genaro; Martinez Torres; Ricardo [CFE-LAPEM, Irapuato, Guanajuato (Mexico)

    2012-07-01

    electricos, segun lo requiere la Comision Federal de Electricidad (CFE) en Mexico. La GCC opera alternativamente como motor y generador; al operar como motor, el control de velocidad durante el arranque, la aceleracion, la reaceleracion y el frenado se llevan a cabo mediante un convertidor de frecuencia estatico (CFES). De modo complementario, el controlador de voltaje maneja la potencia de excitacion para controlar el voltaje de terminal cuando la GCC opera como generador y regula la corriente de excitacion cuando la GCC opera como motor. En comparacion con los sistemas de regulacion de voltaje.

  12. Criterios para la determinación de la frecuencia de rotación mínima del motor en movimiento estable.

    Directory of Open Access Journals (Sweden)

    R. Pérez Gálvez

    2007-05-01

    Full Text Available En este trabajo, se define teóricamente la frecuencia de rotación mínima del motor de combustión interna de un vehículo en movimiento estable. El método emplea la ecuación adimensional del movimiento para encontrar el valor de velocidad que satisface la igualdad del factor dinámico con el coeficiente de resistencia del camino. La validación se realiza mediante la comparación con una base de datos obtenida experimentalmente. También se presenta la influencia de la frecuencia de rotación mínima en movimiento estable con respecto a las cualidades de explotación, en la elaboración de los ciclos teóricos de movimiento, y en la actualización de indicadores de la relación fuente energética – sistema de transmisión. Además, se muestra el comportamiento del Coeficiente de Efectividad del Trabajo del Automóvil (CETA respecto a la velocidad mínima estable.In this paper, the frequency of minimum rotation in stable movement is defined theoretically. This method uses the reduced movement equation to find the value of speed that satisfies the equality of the dynamic factor with the coefficient of road resistance. The validation was made by means of comparison with an experimental database. The influence of minimum rotation frequency in stable movement is presented, with respect to the operation qualities, in the elaboration of theoretical drive cycles, and the updating of indicators for engines and transmission systems. Furthermore, are represented the behavior of the Automobile Work Effectiveness Coefficient with respect to the minimal speed.

  13. Curvas de referência da Escala Motora Infantil de Alberta: percentis para descrição clínica e acompanhamento do desempenho motor ao longo do tempo

    Directory of Open Access Journals (Sweden)

    Raquel Saccani

    2012-02-01

    Full Text Available OBJETIVOS: Comparar os dados de infantes brasileiros com a normativa canadense e estabelecer as curvas de referência e percentis do desenvolvimento motor da Escala Motora Infantil de Alberta segundo sexo. MÉTODOS: Participaram da pesquisa, 795 crianças com idade entre 0 e 18 meses provenientes de diferentes cidades de uma região do Brasil. Os participantes foram avaliados com a Escala Motora Infantil de Alberta, em uma sala silenciosa, por um experiente pesquisador. Foi realizada análise dos percentis (P5, P10, P25, P50, P75, P90 por faixa etária da escala e sexo. RESULTADOS: Não foram encontradas diferenças significativas (p > 0,05 entre meninos e meninas na maioria das diferentes faixas etárias. Apenas aos 14 meses, foi encontrada superioridade das meninas no escore total de desempenho motor (p = 0,015 e no percentil de desenvolvimento (0,021. Verificou-se, para ambos os sexos e para crianças típicas e atípicas, uma tendência de desenvolvimento motor alinear nas curvas desenvolvimentistas. Observou-se variação reduzida das aquisições motoras nos limites etários, nos dois primeiros meses de vida e a partir dos 15 meses. CONCLUSÕES: A Escala Motora Infantil de Alberta, embora seja um instrumento amplamente utilizado em clínica e pesquisa, possui restrições considerando a diferenciação comportamental até os 2 meses e depois dos 15 meses. Essa reduzida sensibilidade da escala nas extremidades etárias pode estar relacionada com o número e dificuldade dos itens motores avaliados nessas idades. Sugere-se a utilização de outros instrumentos de triagem para crianças acima dos 15 meses de idade.

  14. Hydroelectric microcentrals for small consumption centers; Microcentrales hidroelectricas para pequenos centros de consumo

    Energy Technology Data Exchange (ETDEWEB)

    Angeles A, V. H.; Espino C, F. P. [Universidad Autonoma Metropolitana, Mexico, D. F. (Mexico); Buitron Sanchez, H. C. [Programa de Ahorro de Energia para el Sector Electrico, Mexico, D. F. (Mexico)

    1995-12-31

    The utilization of alternate energy sources (wind power, solar and hydro to small scale) represents an option for the rural electrification. This paper analyzes the case of hydro microgeneration, for this purpose the mechanical and electrical fitting are mainly discussed. For the mechanical re-equipment the turbine types that can be used are fundamentally presented and how they can be selected. As to the electrical re-equipment the different types of electric generators are discussed, as well as the form of selecting them, the operation, the control and the protection in the hydroelectric microcentrals. [Espanol] La utilizacion de fuentes alternas de energia (eolica, solar e hidraulica a pequena escala) representan una alternativa para la electrificacion rural. Este trabajo trata del caso de la microgeneracion hidraulica para la cual se discuten principalmente, alternativas para el equipamiento mecanico y electrico. Para el equipamiento mecanico se presentan fundamentalmente los tipos de turbinas que pueden ser utilizadas y como se pueden seleccionar. En cuanto al equipo electrico se manejan los diferentes tipos de generadores, la forma de seleccionarlos, la operacion, el control y la proteccion en las microcentrales hidroelectricas.

  15. Hydroelectric microcentrals for small consumption centers; Microcentrales hidroelectricas para pequenos centros de consumo

    Energy Technology Data Exchange (ETDEWEB)

    Angeles A, V H; Espino C, F P [Universidad Autonoma Metropolitana, Mexico, D. F. (Mexico); Buitron Sanchez, H C [Programa de Ahorro de Energia para el Sector Electrico, Mexico, D. F. (Mexico)

    1996-12-31

    The utilization of alternate energy sources (wind power, solar and hydro to small scale) represents an option for the rural electrification. This paper analyzes the case of hydro microgeneration, for this purpose the mechanical and electrical fitting are mainly discussed. For the mechanical re-equipment the turbine types that can be used are fundamentally presented and how they can be selected. As to the electrical re-equipment the different types of electric generators are discussed, as well as the form of selecting them, the operation, the control and the protection in the hydroelectric microcentrals. [Espanol] La utilizacion de fuentes alternas de energia (eolica, solar e hidraulica a pequena escala) representan una alternativa para la electrificacion rural. Este trabajo trata del caso de la microgeneracion hidraulica para la cual se discuten principalmente, alternativas para el equipamiento mecanico y electrico. Para el equipamiento mecanico se presentan fundamentalmente los tipos de turbinas que pueden ser utilizadas y como se pueden seleccionar. En cuanto al equipo electrico se manejan los diferentes tipos de generadores, la forma de seleccionarlos, la operacion, el control y la proteccion en las microcentrales hidroelectricas.

  16. Adaptación de un motor de combustión interna alternativo de gasolina para su funcionamiento con hidrógeno como combustible. Aplicaciones energética y de automoción

    OpenAIRE

    Sáinz Casas, David

    2016-01-01

    En esta tesis doctoral se presentan los trabajos de investigación realizados recientemente en la Universidad Pública de Navarra sobre la conversión de motores de gasolina para su funcionamiento con hidrógeno, así como el desarrollo de aplicaciones demostrativas prácticas empleando estos motores. Esta línea de investigación es continuación de la producción electrolítica de hidrógeno con energía eólica [15-17]. El objetivo principal de esta tesis es la demostración práctica de la viabilidad de ...

  17. Nuevo procedimiento para la evaluación de los motores monofásicos de inducción; New approach to single–phase induction motors performance evaluation

    Directory of Open Access Journals (Sweden)

    Marcos A.- de Armas Teyra y otros

    2013-01-01

    Full Text Available En el presente trabajo se desarrolló un algoritmo basado en el método del torque en elentrehierro que evalúa el comportamiento de los motores monofásicos de inducción y determinala potencia desarrollada, la eficiencia y otros parámetros operacionales a partir de las medicionesobtenidas de un analizador de redes instalado en los terminales del motor. Los resultados poseenadecuada precisión independientemente de si existen variaciones de tensión y de frecuencia, o silas tensiones están desfasadas o no e incluso donde la disposición espacial de los devanadospueda ser arbitraria con distinto número de vueltas en las bobinas así como diferentes calibres en los conductores. La solución se alcanza sin necesidad de conocer los parámetros del circuitoequivalente. Como casos de estudio se muestra su aplicación a motores de fase dividida, capacitor permanente y asimétrico comparando los resultados con el método tradicional basado en la teoría de los campos rotatorios.In this paper was developed an algorithm based in air gap torque method to evaluate theperformance of single phase induction motors. The developed shaft power, efficiency and otherparameters are determined using a power analyzer installed in motor terminals in field conditions.Results are adequate independently if there exist voltage or frequency deviation, voltageunbalance or different voltage phase between main and auxiliary winding and different spatial disposition of windings, wire size or winding distribution. The solution is obtained withoutknowledge of motor equivalent circuit’s parameters. As cases its application to split phase, permanent capacitor and asymmetric motors are exposed comparing the results with the classic rotating field theory.

  18. Diseño y construcción de un sistema computarizado de alineamiento de neumáticos, revoluciones y puesta a punto del motor para vehículos livianos a gasolina de hasta 8 cilindros

    OpenAIRE

    Carrasco Timbe, Diego Fernando; Venegas Riera, Klever Fernando

    2009-01-01

    El correcto desempeño de un vehículo se ve afectado por diversos factores, estos pueden ser fallas en el motor, en la suspensión o el desgaste incorrecto de los neumáticos, la alineación de llantas es esencial para una buena capacidad de manejo del vehículo y juega un rol muy importante en la vida de las llantas. Una alineación incorrecta y una presión de aire inadecuada en las llantas son consideradas las dos principales causas de desgaste prematuro en las llantas. El sistema de alineación c...

  19. Propuesta de mejora para el mantenimiento del equipo pesado de la constructora COANDES S.A. basado en un análisis del aceite lubricante usado en los motores de combustión interna diésel

    OpenAIRE

    Arévalo Avalos, David Alejandro

    2015-01-01

    Se realiza una propuesta de mejora proactiva-predictiva para el mantenimiento efectuado por COANDES. Primero se efectúa una evaluación de criticidad de los equipos y un estudio del aceite usado en los motores de combustión interna diésel. Finalmente se propone un modelo de análisis de fallas basado en los resultados que incluye un software de interpretación de resultados de análisis de aceite. The investigation performs a proposal for proactive-predictive improvement for the maintenance by...

  20. Diseño de un sistema de análisis temporal y espectral para detectar fallas por vibración en motores eléctricos

    Directory of Open Access Journals (Sweden)

    Francisco Ernesto Moreno-García

    2014-12-01

    Full Text Available El documento se basa en el desarrollo experimental de un sistema de medición y análisis de vibraciones para brindar un estudio de las más relevantes variables utilizadas en el análisis espectral de motores eléctricos, con el fin de detectar posibles fallas. Dicho sistema de análisis fue implementado en un banco de pruebas elaborado por el Grupo de Investigación en Automatización y Control (GIAC, de la Universidad Francisco de Paula Santander.

  1. O ensino do esporte para crianças e jovens: considerações sobre uma fase do processo de desenvolvimento motor esquecida La enseñanza del deporte para niños y jóvenes: consideraciones sobre una etapa olvidada del desarrollo motor The teaching of sport to chidren and youth: considerations about a forgotten phase of motor development

    Directory of Open Access Journals (Sweden)

    Go Tani

    2012-06-01

    Full Text Available O processo ensino-aprendizagem pode ser visto como um sistema constituído pela interação de três componentes - professor, aluno e matéria - que tem por meta promover mudanças efetivas nos comportamentos, capacidades e competências do aluno. Como numa visão sistêmica do processo ensino-aprendizagem, a função de um determinado componente implica sempre o estabelecimento de relação entre os dois componentes que restam, o papel principal do professor é estabelecer relação entre o aluno e a matéria. Neste contexto, a questão central é saber em que se basear para estabelecer essa relação. O presente ensaio parte da assunção de que o conhecimento sobre o desenvolvimento motor constitui um elemento fundamental quando a matéria de ensino é o esporte, discute uma fase desse processo que tem sido sistematicamente esquecida procurando identificar as suas possíveis causas e consequências e apresenta algumas sugestões para trabalhar com essa fase.The teaching-learning process can be viewed as a system constituted by the interaction of three components - teacher, learner and subject matter - whose goal is to promote the effective changes in the learner´s behaviors, capacities and competences. In a systemic view of the teaching-learning process the role played by a given component always implies the establishment of relations between the two remaining components. Thus, the role of the teacher is to establish relations between learner and subject matter. The main question to the teacher is on what to rely upon to establish these relations. The present essay departs from the assumption that knowledge about motor development constitutes a fundamental element when sport is the subject matter. It discusses a phase of that process that has been systematically forgotten in the teaching of sports trying to identify possible causes and consequences, and presents some suggestions of procedures to work with that phase.

  2. Operation planning of electrical power systems; Planeacion de operacion de sistemas electricos de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Rivas, Elena [ed.; Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    1999-07-01

    The development of a software that has facilitated and improved considerably the planning tasks, besides diminishing the production costs is presented. The software denominated Hydrothermal Coordination (HTC)(Coordinacion Hidrotermica (CHT)), was developed in the Instituto de Investigaciones Electricas (IIE), with this software the plan of short term operation of the generating units is determined. The software analyzes mathematically a great number of options regarding to the allocation of generation units and selects very close solutions, in cost, to the optimal one. It constitutes in addition an information system that stores the relevant data of each unit, useful for decision making. [Spanish] Se presenta el desarrollo de un software que ha facilitado y mejorado considerablemente las tareas de planeacion, ademas de disminuir los costos de produccion. El paquete denominado Coordinacion Hidrotermica (CHT), fue desarrollado en el Instituto de Investigaciones Electricas (IIE); con el se determina el plan de operacion a corto plazo de las unidades generadoras. El paquete analiza matematicamente un gran numero de opciones en lo que se refiere a la asignacion de unidades de generacion y selecciona soluciones muy cercanas, en costo, a la optima. Constituye ademas un sistema de informacion que almacena los datos relevantes de cada unidad, utiles para la toma de decisiones.

  3. Programa de intervenção motora para escolares com indicativo de transtorno do desenvolvimento da coordenação - TDC Motor intervention program for school children with signs of developmental coordination disorder - DCD

    Directory of Open Access Journals (Sweden)

    Eva Vilma Alves da Silva

    2011-04-01

    Full Text Available Este estudo objetivou verificar os efeitos de um programa de intervenção motora para escolares com indicativo de Transtorno do Desenvolvimento da Coordenação. Participaram do estudo seis escolares na faixa etária de 10 anos, do gênero feminino e masculino, matriculados em uma escola municipal no interior do Estado de Santa Catarina. A avaliação motora foi mensurada por meio do Movement Assessement Battery for Children (MABC-2. O teste abrange as faixas etárias de três a 16 anos dentro de cada faixa etária são agrupadas oito tarefas em três categorias de habilidades: destreza manual, lançar e receber, equilíbrio. As intervenções foram baseadas na abordagem da Educação Física Desenvolvimentista em ambiente escolar. As sessões foram realizadas individualmente com 20 sessões de intervenção motora para cada escolar, num total de 120 sessões, com frequência de duas aulas semanais e com duração de 45 minutos. Para interpretação dos dados foi utilizado o teste Wilcoxon no pacote estatístico SPSS 13.0 for Windows. Os resultados evidenciaram diferenças estatisticamente significativas após a intervenção motora (pThis study aimed to verify the effects of a motor intervention program for students with signs of DCD. Six 10 year-old students, both male and female, who were registered at a municipal school in the interior of the state of Santa Catarina participated in the study. Motor capacity was measured using the Movement Assessment Battery for Children (MABC-2, one of the most commonly used instruments for assessing children's movement difficulties. The test encompasses the age groups of 3 to 16 years; for each age group, eight tasks are grouped into three skill categories: manual skill, throw and catch, balance. The interventions were based on the Developmental Physical Education approach in school environments. The sessions were done individually with 20 motor intervention sessions for each student, in a total of 120

  4. Certification and normalization in the electrical sector; Certificacion y normalizacion en el sector electrico

    Energy Technology Data Exchange (ETDEWEB)

    Flores Ruiz, Martin [ANCE, Mexico, D.F. (Mexico)

    2001-07-01

    la aparicion de la Ley General de Normas, Pesas y Medidas, en 1988 con la emision de la Ley Federal sobre Metrologia y Normalizacion, en la cual todavia las normas eran consideradas Normas Oficiales Mexicanas, SINDO hasta el 1 de julio de 1992 en que aparece una nueva Ley Federal Sobre Metrologia y Normalizacion en la que las normas se podrian clasificar en Normas Oficiales Mexicanas y Normas Mexicanas, las primeras de obligado cumplimiento y las segundas de caracter voluntario. Asimismo, en esta Ley aparecen nuevos terminos y actores en el ambito de la normalizacion y certificacion, por asi decirlo, dichos actores son los Laboratorios de Calibracion y de Pruebas, los Organismos de Normalizacion, los Organismos de Certificacion y las Unidades de Verificacion. En 1998 aparecen las Reformas a la Ley y donde aparece una nueva figura que es la de la entidad de acreditacion y cuyo objeto y principal trabajo es el de reconocer la competencia tecnica y confiabilidad de los Organismos de Certificacion, de los Laboratorios de Prueba, de los Laboratorios de Calibracion y de las Unidades de Verificacion para la evaluacion de la conformidad, y el 2001 el 15 de marzo aparece en el diario Oficial de la Federacion el eglamento a la Ley Federal sobre Metrologia y Normalizacion a efecto de tener un documento de apoyo para su correcta interpretacion.

  5. Motor Neurons

    DEFF Research Database (Denmark)

    Hounsgaard, Jorn

    2017-01-01

    Motor neurons translate synaptic input from widely distributed premotor networks into patterns of action potentials that orchestrate motor unit force and motor behavior. Intercalated between the CNS and muscles, motor neurons add to and adjust the final motor command. The identity and functional...... in in vitro preparations is far from complete. Nevertheless, a foundation has been provided for pursuing functional significance of intrinsic response properties in motoneurons in vivo during motor behavior at levels from molecules to systems....

  6. The opening of the Mexican electric sector to foreign investment. Volume 1; La apertura externa en el sector electrico Mexicano. Volumen 1

    Energy Technology Data Exchange (ETDEWEB)

    Quintanilla Martinez, Juan [eds.] [Universidad Nacional Autonoma de Mexico, Mexico, D. F. (Mexico)

    1997-12-31

    This document is the first one of three volumes of the 1. Seminar on the Current Conditions and Perspectives of the Electric Sector in Mexico, organized by the Programa Universitario de Energia and the Instituto de Investigaciones Economicas (University Program of Energy and the Institute of Economic Research, both of them agencies of the Universidad Nacional Autonoma de Mexico (UNAM)). The titles of the three volumes are the following: Volume 1.- The opening of the Mexican Electric Sector to foreign investment. Volume 2.- Concrete innovation and technological learning experiences at the Luz y Fuerza del Centro enterprise. Volume 3.- The Electric Energy and the Environment in Mexico. This first volume deals on the World tendencies towards the privatization; the new financing techniques and the reorganization of the Mexican electric industry; the electric rates in the residential sector; the distribution of the income and the electricity expense in Mexican homes, the privatization of the energy in Mexico and the production costs in generation projects planning. These documents were formulated by specialists of the Electric Sector, from the Electric Sector itself as well as from academic entities, public and private [Espanol] Este documento constituye el primero de tres volumenes del Primer Seminario sobre Situacion y Perspectivas del Sector Electrico en Mexico, organizado por el Programa Universitario de Energia y el Instituto de Investigaciones Economicas, ambas dependencias de la Universidad Nacional Autonoma de Mexico (UNAM). Los titulos de los tres volumenes son los siguientes: volumen 1: La apertura externa del sector electrico mexicano, volumen 2: Experiencias concretas de innovacion y aprendizaje tecnologico en la empresa Luz y Fuerza del Centro, volumen 3: Energia electrica y medio ambiente en Mexico. Este primer volumen trata sobre las tendencias mundiales hacia la privatizacion; las nuevas tecnicas de financiamiento y reorganizacion de la industria

  7. Estudio de nuevas estrategias para el control de la combustion en modos parcialmente premezclados en motores de encendido por compresión

    OpenAIRE

    Doménech Llopis, Vicente

    2013-01-01

    En los últimos años, dentro del marco de los motores de encendido por compresión, el número de investigaciones centradas en el desarrollo y estudio de nuevos modos de combustión de baja temperatura premezclados ha sido ingente. Dichos modos presentan indudables ventajas respecto a los modos convencionales de combustión Diesel por difusión, sobre todo en cuanto a la reducción de emisiones contaminantes, especialmente de NOx y hollín características de estos motores. No ...

  8. Automatização de um dinamômetro hidráulico para ensaios de motores de combustão interna

    OpenAIRE

    Albuquerque, Luiz Eduardo Nunes de

    2016-01-01

    Esta dissertação apresenta a automatização de um dinamômetro hidráulico instalado na cabine de testes de motores de combustão interna do laboratório de máquinas térmicas da Universidade de Brasília. O dinamômetro é operado por meio de um controlador analógico que comanda o freio do equipamento pela variação da pressão interna gerada pelo vórtice da água no circuito hidráulico. A pressão interna, por sua vez, é controlada por uma válvula borboleta acoplada a um servo motor de corrente contínua...

  9. Modelado e implementación de un manejador eléctrico para un motor de inducción trifásico

    Directory of Open Access Journals (Sweden)

    Arturo Fajardo Jaimes

    2014-01-01

    Full Text Available This paper gives a detailed description of a non-conventional speed-variation linear model intended for a conventional three-phase induction motor. The proposed architecture consists in a single-phase unit-power-factor tap (PFC followed by three-phase inverter, which feeds the motor by using the scalar-control technique. The whole system is digitally-controlled by a Digital Signal Processor (DSP. In order to obtain the model, non-conventional use of the average operator is suggested, which involves a calculation time span that depends on the target dynamics. This type of analysis simplifies the development of lossless models in terms of model precision. The project was divided into three methodological stages. Stage one established target dynamics for each of the electric-driver parts as well as providing linear models by means of a well-defined stage-specific mobile average operator. Stage two served to validate the models through simulation-based experiments. Finally, controllers were designed and the driver was implemented so as to validate the design process experimentally. The system that was implementing through this modeling process corresponds to a speed-variation unit for a 0,5-HP reduced-voltage (22V induction motor. The implemented system was characterized in terms of the total power-factor correction, a speed regulation level lower than 5 %, and power-processing-unit efficiency (PFC-Inverter of 82 %.

  10. Uma versão compacta do motor elétrico de Faraday para demonstração em sala de aula

    Directory of Open Access Journals (Sweden)

    Osmar Henrique Moura Silva

    2013-06-01

    Full Text Available http://dx.doi.org/10.5007/2175-7941.2013v30n2p385 O “motor” elétrico de Michael Faraday (1791-1867 é versado como o precursor dos motores elétricos atuais e um equipamento interessante no estudo introdutório do assunto. Um trabalho anterior divulgou uma montagem deste motor mais bem adaptada aos ambientes educativos não formais, abrangendo suas duas variantes: uma, com haste móvel e ímã fixo; outra, com haste fixa e ímã móvel. Apresenta-se aqui uma elaboração desse motor na primeira destas variantes que se diferencia nas dimensões e peso, sendo de fácil transporte e uso em sala de aula por apropriação da energia elétrica padrão de 127V.

  11. Escala Motora Infantil de Alberta: validação para uma população gaúcha Escala motora infantil de Alberta: validación para una población de Rio Grande do Sul (Brasil Infant Motor Scale of Alberta: validation for a population of Southern Brazil

    Directory of Open Access Journals (Sweden)

    Nadia Cristina Valentini

    2011-06-01

    Full Text Available OBJETIVO: Traduzir, adaptar e verificar a validade de critérios motor e de constructo (consistência interna, validade dis-criminante, correlação com outros testes e validade preditiva da versão em Português da Alberta Motor Infant Scale. MÉTODOS: Estudo de validação transcultural. Participaram 21 profissionais e 561 crianças do Rio Grande do Sul, com idades de zero a 18 meses (291 meninos. Foram utilizados os instrumentos: Alberta Infant Motor Scale, Escala do Desen-volvimento do Comportamento da Criança e um questionário para controle de variáveis. O estudo compreendeu as fases de tradução e adaptação da escala; análise da validade de conteúdo; treinamento de profissionais; coleta de dados no ambiente familiar e em creches; análise da objetividade e fidedignidade, e validade de critério e construto. RESULTADOS: A versão portuguesa da Alberta Infant Motor Scale continha critérios motores claros e pertinentes; apresentou ótima confiabilidade (escore total, p=0,88; prono, p=0,86; supino, p=0,89; sentado, p=0,80 e em pé, p=0,85 e poder discriminativo (desenvolvimento típico versus atípico; escore, pOBJETIVO: Traducir, adaptar y verificar la validez y clareza de criterios motor y constructo (consistencia interna, vali-dez discriminante, correlación con otras pruebas y validez predictiva de la versión en Portugués de la Alberta Motor Infant Scale. MÉTODOS: Estudio de validación transcultural, descriptivo y transversal. Participaron 21 profesionales y 561 niños de Rio Grande do Sul, con edades entre 0 y 18 meses (291 niños y 270 niñas. Se utilizaron los instrumentos: Alberta Infant Motor Scale (AIMS, Escala del Desarrollo del Comportamiento del Niño (EDCC y un cuestionario para control de variables. El estudio comprendió las etapas de traducción y adaptación de la escala; análisis de la validez de contenido; entrenamiento de profesionales; recolección de datos en el ambiente familiar y en guarderías; an

  12. Efeito da intervenção em esteira motorizada na aquisição da marcha independente e desenvolvimento motor em bebês de risco para atraso desenvolvimental Efecto de la intervención en caminadora automática en la adquisición de la marcha independiente y desarrollo motor en bebés de riesgo para retraso de desarrollo Treadmill training effects on walking acquisition and motor development in infants at risk of developmental delay

    Directory of Open Access Journals (Sweden)

    Diana Xavier C. Schlittler

    2011-03-01

    Full Text Available OBJETIVO: Examinar o efeito de intervenção em esteira motorizada na idade de aquisição da marcha independente em bebês de risco para atraso de desenvolvimento. MÉTODOS: Estudo experimental com 15 lactentes a partir do 5º mês de idade, sendo cinco deles com risco de atraso de desenvolvimento submetidos a sessões de fisioterapia e intervenção em esteira motorizada (Grupo Experimental; cinco com risco de atraso de desenvolvimento submetidos apenas a sessões de fisioterapia (Grupo Controle de Risco; e cinco bebês sem risco de atraso (Grupo Controle Típico. As sessões de fisioterapia ocorreram duas vezes por semana, seguidas de intervenção em esteira motorizada para o grupo experimental. Todos os bebês foram avaliados mensalmente pela Alberta Infant Motor Scale e os participantes do grupo experimental foram filmados durante a realização das passadas na esteira. Comparações entre os grupos ao longo do tempo foram realizadas por análise de variância (ANOVA e de multivariância (MANOVA. RESULTADOS: Os bebês do Grupo Experimental adquiriram a marcha independente aos 12,8 meses e os do Grupo Controle de Risco aos 13,8 meses de idade corrigida, sendo que a aquisição do Grupo Controle de Risco ocorreu mais tarde em relação ao Grupo Controle Típico (1,1 meses; pOBJETIVO: Examinar el efecto de intervención en caminadora automática en la edad de adquisición de la marcha independiente en bebés de riesgo para retraso de desarrollo. MÉTODOS: Estudio experimental de 15 lactantes a partir del 5º mes de edad, siendo 5 con riesgo de retraso de desarrollo sometidos a sesiones de fisioterapia e intervención en caminadora automática (grupo experimental; 5 de riesgo de retraso de desarrollo sometidos solamente a sesiones de fisioterapia (grupo control de riesgo; y 5 bebés sin riesgo de retraso (grupo control típico. Las sesiones de fisioterapia ocurrieron 2 veces en la semana, seguidas de intervención en caminadora autom

  13. Evaluación del etanol obtenido a partir de residuos forestales como aditivo en gasolina para motores de combustión interna

    OpenAIRE

    Flores Quintero, Jesús Enrique; Marín Lopez, Angie M.

    2016-01-01

    La presente investigación consistió en la obtención de etanol a partir de residuos forestales para ser evaluado como aditivo en gasolina. Se obtuvo un mosto (a partir de residuos forestales) rico en azúcares a través de una hidrólisis ácida con ácido sulfúrico al 6% por 3 horas a 80 ºC. Se definieron experimentalmente las condiciones del proceso de fermentación del mosto obtenido con levadura Saccharomices cerevisiae al 50% durante 6 días y destilación simple para la purificación del etanol h...

  14. SRM, motor para el desarrollo de la cadena de valor Supplier Relationship Management – SRM gestión de las relaciones con los proveedores

    Directory of Open Access Journals (Sweden)

    Luis Leonardo Mendoza S.

    2010-01-01

    Ejemplo de ello es el SRM, Supplier Relationship Management, en donde por medio de la constitución de acuerdos basados en intereses comunes, se establecen relaciones estrechas, funcionales y eficientes entre las partes, permitiendo por esta vía la garantía del suministro, y de esta forma, darle un importante impulso para el desarrollo de la cadena de valor.

  15. Análisis estocástico de señales vibratorias de motores de inducción para la detección de fallas usando descomposición de modo empírico

    Directory of Open Access Journals (Sweden)

    Alejandro Rivera Roldán

    2015-04-01

    Full Text Available En este artículo se presenta un análisis de vibraciones en motores de inducción por medio de Modelos Ocultos de Markov (Hidden Markov Model - HMM aplicado a características obtenidas de la Descomposición de Modo Empírico (Empirical Mode Decomposition - EMD y transformada de Hilbert-Huang de señales de vibración obtenidas en las coordenadas x y y, con el fin de detectar fallas de funcionamiento en rodamientos y barras.  Además se presenta un análisis comparativo de la capacidad de las señales de vibración en dirección x y en dirección y, para aportar información en la detección de fallas. Así, un HMM ergódico inicializado y entrenado por medio del algoritmo de máxima esperanza, con convergencia en 10e-7 y un máximo de iteraciones de 100, se aplicó sobre el espacio de características y su desempeño fue determinado mediante validación cruzada 80-20 con 30 fold, obteniendo un alto desempeño para la detección de fallas en términos de exactitud.

  16. Early motor outpatient service intervention for postural control in preterm neonates Intervenção motora precoce ambulatorial para neonatos prematuros no controle postural

    Directory of Open Access Journals (Sweden)

    Clarissa Balbão Almeida

    2008-12-01

    Full Text Available Objective: To insure the motor acquisitions related to the Axial Spontaneous Not Communicative Development, which means postural control and displacement. This was done through an early motor intervention physiotherapy program in preterm neonates born at HSL-PUCRS. Materials and Methods: the interventional program included tasks of visual harassment, toys manipulation and postural control, based on Bobath concept. All five preterms who have participated in the program were evaluated by the physiotherapy service, using The Brazilian Scale of Child behavior Development in the First Year of Life, in the beginning of the study and repeated every two months. Results: The study shows no statistical significant results in relation to postural tasks, dynamic balance and displacement. However, a progression in the preterm’s classification evaluations was demonstrated. In the first month of evaluation the median was 3 (regular classification and in the third and fifth month of evaluation the median maintained in 4 (good classification. Conclusion: The early motor intervention provided a progression in the evaluation`s classification of motor acquisitions of the preterms development, however, no statistical significant results related to postural tasks, dinamic balance and displacemen was shown.Objetivo: Verificar as aquisições motoras relacionadas ao desenvolvimento axial espontâneo não comunicativo, ou seja, controle postural e deslocamento. Isto foi feito através de um programa de intervenção motora fisioterapêutica precoce em neonatos prematuros nascidos no Hospital São Lucas - PUCRS. Materiais e Métodos: Tarefas de perseguição visual, manipulação de brinquedos e de controle postural, baseados no conceito Bobath, foram implementadas no programa interventivo. Todos os 5 prematuros que participaram deste estudo foram avaliados pelo serviço de fisioterapia por meio da Escala de Desenvolvimento do Comportamento da Criança no Primeiro Ano

  17. Analysis of Magnetic Nozzles For Space Plasma Thrusters = Análisis de Toberas Magnéticas para Motores Espaciales de Plasma

    OpenAIRE

    Merino Martínez, Mario

    2013-01-01

    Esta tesis presenta un análisis teórico del funcionamiento de toberas magnéticas para la propulsión espacial por plasmas. El estudio está basado en un modelo tridimensional y bi-fluido de la expansión supersónica de un plasma caliente en un campo magnético divergente. El modelo básico es ampliado progresivamente con la inclusión de términos convectivos dominantes de electrones, el campo magnético inducido por el plasma, poblaciones electrónicas múltiples a distintas temperaturas, y la capacid...

  18. Metodologia simplificada para a análise termoeconómica de sistemas de cogeração com motor Stirling

    OpenAIRE

    Costa, João Miguel Santos

    2013-01-01

    Dissertação de mestrado integrado em Engenharia Mecânica O aumento do consumo de energia a nível mundial tem levado a uma diminuição das reservas de energias fósseis, nomeadamente do petróleo, uma das principais fontes. Surgiu assim a necessidade de diversificação no consumo de energia, o que tem levado ao desenvolvimento de novas tecnologias mais limpas para a geração e conversão de energia, como os sistemas de cogeração, as energias eólica, solar, ondas, a biomassa, bem como ...

  19. PROYECCIÓN DE COSTOS DE UN BUS ARTICULADO CON MOTOR DEDICADO A GAS NATURAL PARA SER UTILIZADO EN LOS SISTEMAS DE TRANSPORTE MASIVO DE COLOMBIA

    OpenAIRE

    JUAN MANTILLA; HELMER ACEVEDO; CARLOS DUQUE; CARLOS GALEANO; SERGIO CARRION

    2009-01-01

    El objetivo del presente trabajo es mostrar los resultados del estudio comparativo de costos entre dos buses articulados que operan con diferentes combustibles, gas natural comprimido y diesel. Los resultados se utilizarán para establecer la viabilidad económica de la implementación de flotas de este tipo de buses en los sistemas de transporte masivo de las grandes ciudades colombianas. La proyección se realizó siguiendo las recomendaciones de operación y mantenimiento dadas por los fabricant...

  20. Software for dimensioning conductors, electroducts and protections for electrical installations of lightning and motors in rural areas; Software para dimensionar condutores, eletrodutos e protecoes para instalacoes eletricas de luz e de forca motriz no meio rural

    Energy Technology Data Exchange (ETDEWEB)

    Bianchi, Inacio; Souza, Teofilo Miguel de [Universidade Estadual Paulista (UNESP), Guaratingueta, SP (Brazil). Dept. de Engenharia Eletrica. Centro de Energias Renovaveis], e-mail: teofilo@feg.unesp.br, e-mail: ibianchi@feg.unesp.br

    2004-07-01

    This paper presents the software MOTORLUZ developed for efficient and economical design of lighting and motors wiring circuits in agricultural zones. The software input data are: voltage, single or three-phase system, circuit or feeder, power factor, voltage drops, temperature, number of circuits, component number and length of each circuit, number of conductors in the conduit and power of each circuit component. Results are presented on screen and archived for future attachment in the design calculus memorial. Archives contains input data, circuit names, currents, conductor diameters, breakers, fuses, conductor total length, conduit diameters and length, partial and total voltage drops for each circuit. Executable version program is easy, compact, and it can runs even in a 3 1/2'' floppy disk drive of any PC microcomputer. A simplified application example data of the software is showed too at this paper. (author)

  1. Diseño e implementación de maletas didácticas para el control de motores utilizando variadores de velocidad para el control de llenado.

    OpenAIRE

    Cevallos Tixi, Miguel Angel; Huiracocha Salavarría, Carlos Andrés

    2015-01-01

    En la actualidad en el sector industrial ecuatoriano se pueden encontrar diversos sistemas de control y mando, así como también diferentes fabricantes de equipos utilizados para los procesos automatizados y con ello aumentar la productividad y realizar la reducción de los costos y mejoras de tiempos de producción. La UNIVERSIDAD POLITÉCNICA SALESIANA está determinada a ofrecer a sus estudiantes una excelente educación, además de impartir el conocimiento de los sistemas modernos y actualiza...

  2. New technologies for the reduction of the use of fossil fuels in automobiles; Nuevas tecnologias para la reduccion del uso de combustibles fosiles en automoviles

    Energy Technology Data Exchange (ETDEWEB)

    Maya Violante, A.; Dorantes Rodriguez, R. [Universidad Autonoma Metropolitana, Unidad Azcapotzalco, Departamento de Energia, Mexico D. F. (Mexico)

    1995-12-31

    el consumo de los energeticos. En la busqueda de estas tecnologias para el ahorro de estos, se suma el problema ambiental que, aunque no sea el de tecnologias en este campo ha seguido tres tendencias basicas. Primero, el aumento en la eficiencia de los motores de combustion interna, el cual consiste en el control y monitoreo constante del funcionamiento de estos motores con el fin de poder determinar el consumo estrictamente necesario del motor, de acuerdo a sus condiciones de carga. Segundo, el desarrollo de sistemas que usen combustibles alternos, como es el caso de los vehiculos hibridos, que emplean turbinas que puedan funcionar con estos combustibles. Tercero, el desarrollo de sistemas electricos de propulsion y regeneracion de energia evitando usar combustibles fosiles. Se podria hablar de una cuarta tendencia, la cual consiste en determinar la mejor manera de controlar y usar el transporte de modo altamente eficiente, tratando de disminuir el consumo de energeticos y aumentar el ahorro de tiempo en transporte, con todos sus beneficios implicitos. El presente trabajo tiene como proposito responder a estas cuestiones a partir de una revision detallada de las principales innovaciones tecnologicas desarrolladas por las principales armadoras a nivel mundial, como BMW, Mercedes Benz, Ford, etc., preocupadas por sacar al mercado mejores vehiculos que consuman menos o nada de combustibles fosiles y que, al mismo tiempo, cumplan mejor con las cada dia mas estrictas normas en materia de contaminacion ambiental. A partir de estas innovaciones se plantean las ventajas y desventajas de cada una de ellas, haciendo un especial enfasis en las tecnologias que, a nuestro juicio, seran las mas convenientes por impulsar en los proximos anos, de acuerdo con nuestra realidad nacional.

  3. New technologies for the reduction of the use of fossil fuels in automobiles; Nuevas tecnologias para la reduccion del uso de combustibles fosiles en automoviles

    Energy Technology Data Exchange (ETDEWEB)

    Maya Violante, A; Dorantes Rodriguez, R [Universidad Autonoma Metropolitana, Unidad Azcapotzalco, Departamento de Energia, Mexico D. F. (Mexico)

    1996-12-31

    el consumo de los energeticos. En la busqueda de estas tecnologias para el ahorro de estos, se suma el problema ambiental que, aunque no sea el de tecnologias en este campo ha seguido tres tendencias basicas. Primero, el aumento en la eficiencia de los motores de combustion interna, el cual consiste en el control y monitoreo constante del funcionamiento de estos motores con el fin de poder determinar el consumo estrictamente necesario del motor, de acuerdo a sus condiciones de carga. Segundo, el desarrollo de sistemas que usen combustibles alternos, como es el caso de los vehiculos hibridos, que emplean turbinas que puedan funcionar con estos combustibles. Tercero, el desarrollo de sistemas electricos de propulsion y regeneracion de energia evitando usar combustibles fosiles. Se podria hablar de una cuarta tendencia, la cual consiste en determinar la mejor manera de controlar y usar el transporte de modo altamente eficiente, tratando de disminuir el consumo de energeticos y aumentar el ahorro de tiempo en transporte, con todos sus beneficios implicitos. El presente trabajo tiene como proposito responder a estas cuestiones a partir de una revision detallada de las principales innovaciones tecnologicas desarrolladas por las principales armadoras a nivel mundial, como BMW, Mercedes Benz, Ford, etc., preocupadas por sacar al mercado mejores vehiculos que consuman menos o nada de combustibles fosiles y que, al mismo tiempo, cumplan mejor con las cada dia mas estrictas normas en materia de contaminacion ambiental. A partir de estas innovaciones se plantean las ventajas y desventajas de cada una de ellas, haciendo un especial enfasis en las tecnologias que, a nuestro juicio, seran las mas convenientes por impulsar en los proximos anos, de acuerdo con nuestra realidad nacional.

  4. Wind Energy and Transport Synergy: Electric Vehicle or Hydrogen Vehicle?; Sinergia Energia Eolica Transporte: vehiculo electrico o vehiculo de hidrogeno?

    Energy Technology Data Exchange (ETDEWEB)

    Cruz, I.

    2009-07-01

    This article briefly analyzes the potential uses of hydrogen as a form of energy from wind power. It also briefly describes the different experiences gained in wind energy-based hydrogen production by water hydrolysis, and finally it concludes with a brief analysis of the competition between hydrogen and the new ion-lithium batteries used in motor vehicles as potential solutions to support wind energy management. (Author)

  5. Solución analítica de un filtro de Kalman estacionario para la observación de deriva en modelos de emisiones de NOx en motores diesel de automoción

    Directory of Open Access Journals (Sweden)

    C. Guardiola

    2015-04-01

    Full Text Available Resumen: En los algoritmos de control y diagnóstico de los motores diesel la precisión en la estimación de las variables resulta crítica. En el caso de las emisiones de óxidos de nitrógeno (NOx recientemente se han desarrollado sensores con una buena precisión de medida estacionaria pero que, debido a su lentitud y a la existencia de un retraso significativo, presentan unas características dinámicas insuficientes para el control. Por otro lado, existen diferentes tipos de modelos capaces de reproducir con mayor o menor precisión la respuesta dinámica de los NOx; sin embargo, ninguno de ellos está exento de deriva asociada al envejecimiento del motor y de los diferentes sensores que suministran las entradas al modelo. La combinación de un modelo de emisiones con un sensor de NOx permite proporcionar una estimación que combina las características dinámicas del modelo con la precisión del sensor. En este trabajo se combina la información a través de un modelo en espacio de estados que permite la observación y corrección de la deriva del modelo de NOx. El vector de estado que describe la salida objetivo se aumenta con un estado extra que define la deriva o error estacionario entre el modelo derivado y la referencia de medida del sensor. El vector de estado es observado mediante un filtro de Kalman. Dicho modelo es lineal invariante en el tiempo y las covarianzas de los ruidos que afectan a los estados son consideradas como constantes. Bajo estas hipótesis, el filtro es estacionario, es decir, la ecuación de Riccati que estima la ganancia del filtro converge tras un número determinado de iteraciones. El presente artículo resuelve la ecuación iterativa de Riccati para dichas condiciones y deriva la solución analítica del filtro. Asimismo, dicho algoritmo es usado para la estimación de NOx en un motor diesel y en el nuevo ciclo Europeo de conducción (NEDC. Abstract: An augmented state-space model for drift correction is

  6. Limitations of the Neurological Evolutional Exam (ENE as a motor assessment for first graders Limitações do Exame Neurológico Evolutivo (ENE como um instrumento de avaliação motora para crianças da primeira série

    Directory of Open Access Journals (Sweden)

    Priscila M. Caçola

    2010-10-01

    Full Text Available BACKGROUND: Many clinicians and researchers in Brazil consider the Neurological Developmental Exam (NDE, a valid and reliable assessment for Brazilian school-aged children. However, since its inception, several tests have emerged that, according to some researchers, provide more in-depth evaluation of motor ability and go beyond the detection of general motor status (soft neurological signs. OBJECTIVES: To highlight the limitations of the NDE as a motor skill assessment for first graders. METHODS: Thirty-five children were compared on seven selected items of the NDE, seven of the Bruininks-Oseretsky Test (BOT, and seven of the Visual-Motor Integration test (VMI. Participants received a "pass" or "fail" score for each item, as prescribed by the respective test manual. RESULTS: Chi-square and ANOVA results indicated that the vast majority of children (74% passed the NDE items, whereas values for the other tests were 29% (BOT and 20% (VMI. Analysis of specific categories (e.g. visual, fine, and gross motor coordination revealed a similar outcome. CONCLUSIONS: Our data suggest that while the NDE may be a valid and reliable test for the detection of general motor status, its use as a diagnostic/remedial tool for identifying motor ability is questionable. One of our recommendations is the consideration of a revised NDE in light of the current needs of clinicians and researchers.CONTEXTUALIZAÇÃO: Muitos clínicos e pesquisadores brasileiros consideram o Exame Neurológico Evolutivo (ENE, um instrumento válido e confiável para crianças brasileiras em idade escolar. Entretanto, desde a sua criação, surgiram outros testes para uma avaliação mais profunda de habilidade motora, os quais vão além de detectar status motor geral em forma de sinais neurológicos leves. OBJETIVOS: Demonstrar os pontos fracos do ENE como teste de avaliação de habilidade motora para crianças de primeira série. MÉTODOS: Trinta e cinco crianças realizaram 7 itens

  7. Reduction of CO{sub 2} emissions in the electrical sector; Reduccion de emisiones de CO{sub 2} en el sector electrico

    Energy Technology Data Exchange (ETDEWEB)

    Palafox Palafox, Sergio [Comision Federal de Electricidad (Mexico)

    2008-07-15

    The climatic change is directly tied to the increase in the concentration of greenhouse effect gases in the atmosphere, product of human activities, mainly by the burning of fossil fuels and the deforestation. In this presentation it is spoken on the climatic change; the actions of Mexico with respect to the climatic change are mentioned; the importance of the renewable energies, such as the wind power the hydraulic energy, the geothermal and the sun power, and finally the present situation of the Mexican electrical sector is presented. [Spanish] El cambio climatico esta directamente vinculado con el aumento en la concentracion de gases de efecto invernadero en la atmosfera, producto de actividades humanas, principalmente por la quema de combustibles fosiles y la deforestacion. En esta presentacion se habla sobre cambio climatico; se mencionan las acciones de Mexico con respecto al cambio climatico; la importancia de las energias renovables, como la eolica, la hidraulica, la geotermica y la solar, y por ultimo se presenta la situacion actual del sector electrico mexicano.

  8. Electric vehicles for the urban solid wastes collection in Seville (Spain); Vehiculos electricos para la recogida de residuos en el caso historico de Sevilla

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Garcia, A.

    1998-07-01

    New technologies and systems are incorporated the design of public cleansing and collection of Municipal Solid Waste vehicles. Now types of vehicles propelled by electric power exist in the market: the electric pure traction vehicles and the electric combined traction vehicles, that we to their time could classify hybrid series in vehicles hybrid ``bimodal`` and hybrid parallel or tri modal. For their configuration and their characteristics, the system bimodal is the most adequate for their current application to public cleansing vehicles. (Author)

  9. The electric motor handbook

    Energy Technology Data Exchange (ETDEWEB)

    Hurst, R.W.; Feltham, P. (eds.)

    2004-05-01

    This handbook outlines the important role that electric motors play in modern society. It covers the field of motor applications from various motor types to their use and repair. It also presents practical applications of electric motors and methods on motor efficiency. More than half of all electricity generated, and 75 per cent of all industrial electricity consumption is consumed by electric motors. Electrical personnel must be aware of all factors involved in electric motors in order to choose and apply the appropriate size of electric motor. These factors include efficiency, sizing and proper application. The efficient use and maximum life expectancy of electric motors depends on proper motor protection, control and maintenance. This handbook includes articles from leading experts on electric motors in modern electrical systems. The content includes: design considerations; proper electric motor sizing techniques; optimal electric motor application; electric motor protection technology; electric motor control principles; electric motor maintenance and troubleshooting; induction electric motors; electric motor bearing currents; electric motor bearing lubrication; electromagnetism; electric motor enclosures; electric motor testing; electric motor repair; DC electric motor; electric motor starters; electric motor brushes; industrial electric motors; electric motor diagrams; AC electric motors; electric motor wiring; electric motor service; electric motor rewinding; electric motor winding; diagram of electric motor wiring; electric motor kit; and, troubleshooting electric motors. A directory of motor manufacturers and suppliers was also included. refs., tabs., figs.

  10. Simulación de procesos termodinámicos cuasi ideales orientados a la generación de trabajo mecánico. Evaluación de combinaciones posibles para su aplicación en motores alternativos de combustión o de aportación de calor

    OpenAIRE

    Llop Garcia, Xavier

    2009-01-01

    El objetivo del presente proyecto es la obtención de una herramienta informática que, gracias a un modelo matemático, simule los procesos termodinámicos de la fase cerrada de un motor alternativo de combustión interna. El motor que se pretende simular puede seguir un ciclo Otto o un ciclo Diesel y ser alimentado por distintos tipos de combustible. Para la obtención del modelo matemático se aceptaran ciertas hipótesis de simplificación debido a la complejidad de los procesos que tienen luga...

  11. Caracterización, obtención y validación del modelo dinámico de un motor de inducción con rótor devanado para su utilización como DFIG

    OpenAIRE

    Bañón Martín, José Miguel

    2016-01-01

    En este proyecto se pretende realizar la caracterización de un motor trifásico de inducción de rotor devanado. Siguiendo los pasos y especificaciones que nos indique la norma UNE. Las máquinas eléctricas juegan un papel muy importante en la actualidad, tanto como generador como motor. Nuestro trabajo irá enfocado a una máquina de inducción ampliamente utilizada en la industria. Para entrar en contacto con el mundo de las máquinas eléctricas utilizaremos una serie de libros básicos sobre es...

  12. El turismo como motor potencial para el desarrollo económico de zonas fronterizas en vías de desarrollo. Un estudio de caso

    Directory of Open Access Journals (Sweden)

    Francisco Orgaz Agüera

    2016-01-01

    Full Text Available El turismo se configura como uno de los principales sectores económicos a nivel internacional, adquiriendo importancia en los países en vías de desarrollo. El objetivo de la investigación es analizar las potencialidades turísticas de un destino en vías de desarrollo localizado en una zona fronteriza (turismo fronterizo, en concreto, la provincia de Dajabón (República Dominicana. Otro de los objetivos es conocer la percepción de los residentes ante el turismo y elementos que pueden afectar a este sector. La finalidad es elaborar propuestas para mejorar el turismo en este destino, con la misión de que este sector fomente el desarrollo sostenible en esta área geográfica. La metodología ha consistido en una combinación de entrevistas, grupos de discusión y encuestas. Los resultados muestran que la provincia de Dajabón tiene un gran potencial turístico, si bien, la percepción de los residentes hacia esta actividad es muy baja.

  13. Validação da escala motora funcional EK para a língua portuguesa Validation of the EK functional motor scale in the Portuguese language

    Directory of Open Access Journals (Sweden)

    José Antônio Baddini Martinez

    2006-10-01

    Full Text Available OBJETIVO: Validar uma versão traduzida para o português da escala funcional EK (Egen Klassifikation, desenvolvida na Dinamarca, visando aplicação em pacientes com distrofia muscular de Duchenne e atrofia muscular espinhal. MÉTODOS: Uma versão em inglês da escala EK foi traduzida para o português falado no Brasil. Tal escala foi aplicada a 26 pacientes do sexo masculino (idade média = 12,7 ± 4,0 anos, com diagnóstico de distrofia muscular de Duchenne. Os pacientes também responderam questões referentes a uma versão em língua portuguesa do índice de Barthel e tiveram medidas a força de preensão palmar direita e esquerda, com emprego de um dinamômetro de mão. Os escores da escala EK foram correlacionados com a idade, escores do índice de Barthel e as forças palmares. RESULTADOS: O escore total médio da escala EK foi de 8,1 ± 7,3 e do índice de Barthel de 54,0 ± 26,2. A força de preensão palmar direita foi de 12,7 ± 17,2% e a esquerda de 14,6 ± 19,8% do previsto. Os escores da escala EK correlacionaram-se de maneira altamente significante com a idade (r= 0,596, p= 0,0013, força de preensão palmar direita (r= -0,556, p= 0,0032 e esquerda (r= -0,623, p=0,0007, e com o índice de Barthel (r= -0,928, p OBJECTIVE: To validate a Portuguese version of the EK scale (Egen Klassifikation, that was developed in Denmark for patients with Duchenne muscular dystrophy, and spinal muscular atrophy. METHODS: An English version of the EK scale was translated into the Portuguese language as spoken in Brazil. This scale was applied to 26 male patients (mean age = 12.7 ± 4.0 years with Duchenne muscular dystrophy. Patients also answered questions of a Portuguese version of the Barthel index questionnaire, and had their right and left hand grip forces measured with a dynamometer. RESULTS: The mean total EK scale score was 8.1 ± 7.3 and the Barthel index 54.0 ± 26.2. The mean hand grip force was 12.7 ± 17.2 % predicted for the right

  14. Desarrollo de sistemas expertos en tiempo real para la detección y diagnóstico de faltas en motores trifásicos de inducción

    Directory of Open Access Journals (Sweden)

    Luis Diego Murillo Soto

    2011-10-01

    Full Text Available El presente trabajo muestra las etapas y arquitectura para el  desarrollo de sistemas expertos (SE, orientados a detectar y diagnosticar las condiciones anormales de diseño en que opera el motor, estas condiciones fuera de rango son conocidas como faltas. Las faltas pueden evidenciarse al comparar el valor de diseño de alguna variable y la medición real en el punto de operación.Comercialmente existen sistemas en línea que permiten monitorear un conjunto de variables, pero requiere de una persona experta en el tema, que establezca las variables a medir y la frecuencia de medición. Posteriormente se requiere el análisis de los datos y las recomendaciones generales de los posibles causantes del problema, así como las respectivas acciones correctivas por parte del experto.El anterior sistema de monitoreo y diagnóstico está limitado principalmente por: existencia del equipo de monitoreo, contar con un experto que realice el diagnóstico, y sus respectivos costos.El diseño e implementación de un sistema experto que automatice la captura e interpretación de los datos, permitirá lograr una solución económica a las limitantes planteadas.

  15. Motor homopolar

    OpenAIRE

    Martín Muñoz, Agustín

    2007-01-01

    Mostramos la construcción de un modelo de motor homopolar, uno de los más antiguos tipos de motores eléctricos. Se caracterizan porque el campo magnético del imán mantiene siempre la misma polaridad (de ahí su nombre, del griego homos, igual), de modo que, cuando una corriente eléctrica atraviesa el campo magnético, aparece una fuerza que hace girar los elementos no fijados mecánicamente. En el sencillísimo motor homopolar colgado (Schlichting y Ucke 2004), el imán puede girar ...

  16. Desarrollo de un modelo para la estimación de la presión en la cámara de combustión en un motor Robin EY15 en condiciones de vacío y a velocidad constante, a partir de la señal de vibración

    OpenAIRE

    Grajales Herrera, Jairo Andrés

    2016-01-01

    Con el propósito de monitorear el funcionamiento de los motores de combustión internar, en este trabajo se presenta un método para la estimación de la presión en la cámara de combustión a partir del procesamiento de la señal de vibración. Se presentan también dos métodos para el diagnóstico de falla de motores de combustión a partir del análisis de las señales de vibración. A partir del uso de estrategias de mantenimiento preventivo y predictivo en las empresas se han logrado reducciones en l...

  17. Application of stepping motor

    International Nuclear Information System (INIS)

    1980-10-01

    This book is divided into three parts, which is about practical using of stepping motor. The first part has six chapters. The contents of the first part are about stepping motor, classification of stepping motor, basic theory og stepping motor, characteristic and basic words, types and characteristic of stepping motor in hybrid type and basic control of stepping motor. The second part deals with application of stepping motor with hardware of stepping motor control, stepping motor control by microcomputer and software of stepping motor control. The last part mentions choice of stepping motor system, examples of stepping motor, measurement of stepping motor and practical cases of application of stepping motor.

  18. Using fuzzy logic to control the power of a biomass gasifier ventilation system motor to ensure suitable oxidation temperature for tar cracking; Uso da logica fuzzy para controle da potencia do motor do sistema de ventilacao de um gaseificador de biomassa que assegure temperatura de oxidacao adequada para craqueamento do alcatrao

    Energy Technology Data Exchange (ETDEWEB)

    Rezende, Oscar L.T.; Kulitz, Hans H. [Instituto Federal de Educacao, Ciencia e Tecnologia do Espirito Santo (IFES), Vitoria, ES (Brazil)], email: oscar@ifes.edu.br; Silva, Jadir N.; Galvarro, Svetlana F.S. [Universidade Federal de Vicosa (UFV), MG (Brazil). Dept. de Engenharia Agricola; Martin, Samuel [Universidade de Brasilia (FAV/UNB), DF (Brazil). Fac. de Agronomia e Medicina Veterinaria

    2011-07-01

    There are several models of biomass gasifier. The one used in this study was the concurrent model, in which fuel is fed through the top and air feed occurs in descending flow through combustion and reduction zones, producing low-tar gas. Nevertheless, total tar burning must be ensured in order to produce a gas, suitable for several applications. This study aimed at developing a fuzzy-based algorithm to control the active power applied to a gasifier ventilation system motor, which can ensure adequate oxidation temperature for cracking tar that may be present in the gas produced. The input variables of the fuzzy controller were oxidation zone temperature and the variation rate of this temperature. The output variable was active power. The rule base was created using experimental data. The tests performed with this algorithm allowed observing that the oxidation temperature can be set to a value desired, which does not occur in gasification processes without ventilation system control. (author)

  19. Recém-nascido pequeno para a idade gestacional: repercussão nas habilidades motoras finas Pequeño para la edad gestacional: repercusión en las habilidades motoras finas Small-for-gestational-age newborn infant: repercussion on fine motor skills

    Directory of Open Access Journals (Sweden)

    Amabile Vessoni Arias

    2011-03-01

    aro suspendido" hubo diferencia significativa (p=0,02; prueba Exacta de Fisher, demostrando mayor frecuencia de ejecución para el grupo PEG en el 3er mes de vida. CONCLUSIONES: Se supone que la diferencia encontrada en el ítem "alcanza el aro suspendido" pueda ser atribuida a la gran ocurrencia de movimientos de los brazos observada en el grupo PEG y no a una condición mejor de desarrollo en este grupo.OBJECTIVE: To compare the fine motor skills of full-term small-for-gestational-age (SGA and appropriate-for-gestational-age (AGA infants in the third month of life. METHODS: This observational cross-sectional study enrolled 67 infants (21 SGA and 46 AGA in the third month of life. Infants presenting genetic syndromes, congenital malformations, congenital infections and those who needed neonatal intensive care were excluded. The Bayley Scales of Infant Development-II were used, with emphasis on items that evaluate the fine motor skills. RESULTS: No differences were observed between groups for motor (p=0.21 and mental (p=0.45 scales in the third month. There was a significant difference between the groups on the item "Reaches for Suspended Ring" (Fisher's exact test; p-value=0.02: a higher percentage of SGA infants accomplished this item in the third month of life. CONCLUSIONS: We hypothesize that the difference found in the item "Reaches for Suspended Ring" could be attributed to an increased frequency of arm movements observed in SGA infants and not to a better neurodevelopment of this group.

  20. Recubrimiento de Stellite 6 sobre acero inoxidable realizado con láser de CO2 para válvulas de escape de motores diesel

    Directory of Open Access Journals (Sweden)

    Cadenas, M.

    2002-12-01

    Full Text Available To reduce the recovery or the replacement costs of diesel engine exhaust valves, they are manufactured with an economic base material, and a coating which is deposited on the seat valve in order to reach high hardness and good impact, corrosion and high temperature wear resistance (>550 °C and without lubrication. In this work, appropriate laser cladding parameters have been determined to obtain Stellite 6 coatings over AISI 304 steel (as plane test specimens and SAE EV8 steel (as valves substrates. One and two superimposed tracks were deposited on the seat valves, and modifying the laser power as a function of the rotated angle at the beginning and the end of the circular tracks, pores and cracks have been minimized and the thickness of the track were made uniform. Hardness, dilution and final microstructure of the different coatings have been analysed. A 10 % dilution and 550 HV in the tracks over plane test specimens was observed, while valves with one track showed 25 % and 430 HV respectively. With two superimposed tracks the hardness was up to 470 HV in the upper track.

    Para abaratar el coste de recuperación o sustitución de válvulas de escape en motores diesel, estas se fabrican con un material base económico, recubriéndose el asiento de la válvula con otro material al que se exigirá elevada dureza y buena resistencia al impacto, a la corrosión y al desgaste erosivo en caliente (>550 °C y sin lubricación. Partiendo de esta idea, en el presente trabajo se han determinado los parámetros adecuados para realizar, mediante la técnica de plaqueado láser, un recubrimiento con Stellite 6, sobre sustratos de acero AISI 304 (probetas planas y SAE EV8 (válvulas reales. Sobre las válvulas, se depositaron uno y dos cordones superpuestos, se minimizó la presencia de poros y grietas, modificando el grado de solape inicial y final de los cordones circulares y la potencia en función del ángulo girado. Así, se

  1. Application of the optimum reactive power dispatch to the cost establishment for the support voltage in a power electrical system for generalized dispatch; Aplicacion del despacho optimo de potencia reactiva al establecimiento del costo por el soporte de voltaje en un sistema electrico de potencia con despacho centralizado

    Energy Technology Data Exchange (ETDEWEB)

    Barragan Gomez, Sergio Baruch

    2004-05-15

    for voltage support of each generator is formed by a fixed and a variable cost. The fixed cost is calculated from the annual recovery factor of the capital invested in the generator. The variable cost depends on the operation conditions and on the cost for loss of opportunity of the generator. To determine the total cost for the voltage support of generators, it is considered that the market of active power has already been solved previously through an economic dispatch of active power. The systems used for the evaluation of the developed program are: a 5 nodes system and the IEEE 30 nodes system. [Spanish] Los cambios en las estructuras de los sistemas electricos de esquemas verticales a esquemas horizontales ha provocado que los sistemas esten formados por cuatro segmentos: generacion, transmision, distribucion y comercializacion. Bajo este esquema el operador del sistema es el encargado de administrar y operar de manera economica y segura al sistema. Una de las tareas principales de esta organizacion junto con la red de transmision es la de realizar el movimiento de potencia desde los centros de generacion hasta los puntos de consumo, no obstante para poder llevar a cabo esta actividad se necesita un conjunto de servicios auxiliares. En un esquema horizontal, el soporte de voltaje por parte de los generadores es considerado como un servicio auxiliar, el cual es necesario para la operacion del sistema. Si bien la compensacion de potencia reactiva en un sistema electrico se debe realizar de manera local a traves de compensacion en derivacion, compensadores estaticos, condensadores sincronos y transformadores con cambiador en derivacion bajo carga, debido a que el transmitir flujos de potencia reactiva desde los generadores provoca un incremento en las perdidas del sistema de transmision; sin embargo aunque la funcion principal de los generadores sincronos es la produccion de potencia activa, de manera implicita estos generan potencia reactiva bajo ciertas condiciones

  2. Analysis and evaluation of the main factors that influence the growing of the electrical power consumption in the national electrical sector, period 2000-2005; Analisis y evaluacion de los principales factores que influyen en el crecimiento del consumo de energia electrica en el sector electrico nacional, periodo 2000-2005

    Energy Technology Data Exchange (ETDEWEB)

    Aguilar Luna, Luis Miguel

    2008-06-15

    de potencia (CUFP). Ademas, se desarrolla en esta tesis las ecuaciones utilizadas en el Jacobiano del metodo Newton-Raphson, para resolver flujos de potencia incluyendo los dispositivos SIFLETCA. Se muestra diferentes aplicaciones que se tienen al instalar un dispositivo, tales como prevencion de flujos en anillo, barrera electronica, incremento en la capacidad de transmision y especificacion del flujo de potencia en lineas de transmision. Por otra parte, se desarrolla en la tesis un analisis de sensibilidades de un sistema de potencia en estado estacionario. Tambien se proponen en la tesis los parametros de control para los cuales se calcula las sensibilidades. Asimismo, se utiliza un indice de desempeno para medir el grado de congestion de un sistema electrico. Al calcular las sensibilidades se utiliza los resultados obtenidos de los flujos de potencia. Se usa 4 redes electricas para encontrar donde se debe situar cada dispositivo SIFLETCA para reducir la congestion en el sistema. Tambien, se compara el metodo desarrollado en la tesis con un metodo de sensibilidades que emplea flujos de CD para validacion y mostrar las ventajas de usar el metodo Newton en flujos de potencia.

  3. Adaptação da AMPS-escolar para crianças brasileiras de 4 a 8 anos Adaptación de la AMPS-escolar para niños brasileños de 4 a 8 años Adaptation of the school-AMPS (Assessment of Motor and Process Skills to Brazilian children from 4 to 8 years old

    Directory of Open Access Journals (Sweden)

    Maria das Graças Abreu de Faria

    2006-12-01

    ajuste, pero el instrumento puede ser útil para evaluar la competencia funcional en niños brasileños con necesidades especiales.The objective of this study was to translate, adapt and analyze the item validity of the School-Version of the Assessment of Motor and Process Skills (School-AMPS. The methodology included the translation, simplification of scoring criteria and selection of motor tasks, which are relevant for classroom performance. Thirty typically developing children, ages 4, 6, and 8 years old, were observed individually, when performing the selected tasks. Rasch analysis indicated that the items proposed were easy for the sample, two items in the motor scale and three items in the process scale presented erratic score patterns, which compromised the test construct validity. The children presented valid patterns of response and there was a significant relationship (Pearson r between the measures of motor skills (0,59 and process (0,53 skills and the child’s age. It was concluded that some items needed adjustments, but the instrument could be useful to evaluate the functional competence of Brazilian children with special needs.

  4. Análisis de modos de falla, efectos y criticidad (AMFEC) del sistema de inyección de un motor de encendido provocado Corsa Evolution 1.4L empleando herramientas de aprendizaje y clasificación para la programación del mantenimiento

    OpenAIRE

    Aguilar Romero, Angel Yasmany; Tandazo Flores, Luis Fernando

    2017-01-01

    En este proyecto se desarrolla la técnica de análisis de modos de falla, efectos y criticidad (AMFEC) en el sistema de inyección del motor de un vehículo a raíz de la información obtenida sobre su comportamiento en diferentes estados de funcionamiento, los datos adquiridos son analizados mediante herramientas de aprendizaje y clasificación para la programación del mantenimiento. This project develops the technique of analysis of modes of failure, effects and criticality (AMFEC) in the syst...

  5. Capacidades motoras envolvidas na habilidade psicomotora da técnica de ressuscitação cardiopulmonar: subsídios para o processo ensino-aprendizagem Capacidades motoras involucradas en la habilidad psicomotora de la técnica de resucitación cardiopulmonar: subsídios para el proceso ensenanza-aprendizaje Motor capacities involved in the psychomotor skills of the cardiopulmonary resuscitation: subsidies of the teaching-learning process

    Directory of Open Access Journals (Sweden)

    Ana Maria Kazue Miyadahira

    2001-12-01

    Full Text Available Trata-se de uma estudo bibliográfico sobre a identificação das capacidades motoras envolvidas na habilidade psicomotora da técnica de ressuscitação cardiopulmonar (RCP cuja finalidade é obter subsídios para o planejamento do processo ensino-aprendizagem desta habilidade. Verificou-se que as capacidades motoras envolvidas na habilidade psicomotora da técnica de RCP são predominantemente cognitivas e motoras, envolvendo 9 capacidades perceptivo-motoras e 8 capacidades de proficiência física. A técnica de RCP é uma habilidade psicomotora classificada como aberta, seriada e categorizada como uma habilidade fina e global e o processo de ensino-aprendizagem da técnica de RCP tem alto grau de complexidade.Se trata de un estudio bibliográfico sobre la identificación de las capacidades motoras involucradas en la habilidad psicomotora de la técnica de resucitación cardiopulmonar (RCP cuya finalidad fue obtener subsidios para la planificación del proceso ensenanza-aprendizaje de esta habilidad. Se verifico que las capacidades motoras involucradas en la habilidad psicomotora de la técnica de RCP son predominantemente cognitivas y motoras, involucrando 9 capacidades perceptivo-motoras y 8 capacidades de proficiencia física. La técnica de RCP es una habilidad psicomotora clasificada como abierta, seriada y categorizada como una habilidad fina y global y el proceso de ensenanza-aprendizaje de la técnica de RCP tiene alto grado de complejidad.It is a bibliographic study about the identification of the motor capacities involved in the psychomotor skills of the cardiopulmonary resuscitation (CPR which aims to obtain subsidies to the planning of the teaching-learning process of this skill. It was found that: the motor capacities involved in the psychomotor skill of the CPR technique are predominantly cognitive and motor, involving 9 perceptive-motor capacities and 8 physical proficiency capacities. The CPR technique is a psychomotor skill

  6. Uses and updating of the Benders method in the integer-mixed programming in the planning of the electric power systems expansion; Usos y actualizacion del metodo de Benders en la programacion entera-mixta y en la planeacion de la expansion de los sistemas electricos de potencia

    Energy Technology Data Exchange (ETDEWEB)

    De la Torre Vega, Eli

    1997-04-01

    of some potential improvements that the proposed method has. [Espanol] En el primer capitulo se presenta la deduccion de los cortes de Benders partiendo de las propiedades de la dualidad. Tambien se presentan las propiedades de los cortes de Benders asi como el algoritmo inicial de Benders para resolver cualquier problema de programacion lineal entera-mixta. En el segundo capitulo, se presenta el problema de la planeacion de la expansion de los medios de generacion y transmision en un sistema electrico de potencia, las distintas estructuras de la programacion matematica a que da lugar y como se puede adaptar el metodo de Benders a estas. En el tercer capitulo se presentan las aportaciones teoricas de este trabajo: a) Como inicializar el problema maestro para aprovechar la experiencia adquirida despues de haber resuelto un problema similar, de modo que se pueda resolver mas eficientemente, la sucesion de problemas de programacion lineal entero-mixtos que surgen al resolver el problema de la planeacion de la expansion de los medios de generacion y transmision en un sistema electrico de potencia. b) Como generar un problema maestro cuya solucion optima continua corresponda al optimo continuo del problema entero-mixto, de modo que la busqueda de soluciones enteras se realice en la vecindad del optimo continuo. c) Como generar una solucion entera, cercana al optimo continuo del problema entero-mixto, que tenga mucha probabilidad de ser factible, y que quizas sea la solucion optima entera, en un tiempo menor al que se requiere para resolverlo en forma exacta. Ademas, se presentan otras ideas que se le pueden incorporar al metodo de Benders. A fin de mostrar la efectividad de las ideas propuestas, en el capitulo 4 se presentan los resultados obtenidos al resolver varios problemas usando: 1. El metodo de Benders in actualizacion, 2. El metodo de Ramificacion y Acotamiento, 3. La actualizacion de Benders al agregar restricciones y 4. La actualizacion de Benders al considerar

  7. Fine motor control

    Science.gov (United States)

    ... gross (large, general) motor control. An example of gross motor control is waving an arm in greeting. Problems ... out the child's developmental age. Children develop fine motor skills over time, by practicing and being taught. To ...

  8. A microwave technique for electrical conductivity measurements in semiconductors; Un procedimiento en frecuencia de microondas para la medicion de la conductividad electrica en semiconductores

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez, A; Zehe, A [Benemerita Universidad Autonoma de Puebla, Puebla (Mexico); Starostenko, O [Universidad de las Americas, Puebla, (Mexico); Perez, L [Benemerita Universidad Autonoma de Puebla, Puebla (Mexico)

    2003-01-15

    In the present paper a theoretical approach is given together with the description of the experimental technique for electrical conductivity measurements of semiconductors in frequency range of 10 GHz, corresponding to a wavelength of {lambda}= 3 cm. It is shown, that the sample conductivity, measured without the need of electrical contacts, Is practically identical with results obtained by direct current methods. The potential use of the method for dielectric measurements in samples of general shape is included in the discussion. Given that the local electrical field is known only in bodies of ellipsoidal shape, one has to apply approximation methods for sample shapes of practical relevance (cylinders, cubes, disks). Finally, the measuring range and corresponding errors are explained on the base of measurements realized with silicon samples. [Spanish] En el presente trabajo se desarrolla la teoria junto con la descripcion del arreglo experimental para la medicion de la conductividad electrica en muestras semiconductoras, utilizando un campo de microondas de {lambda}= 3 cm, correspondiente a una frecuencia n de 10 GHz. Se demuestra que la conductividad electrica medida sin la necesidad de contactos electricos es practicamente identica con resultados obtenidos por el metodo comun utilizando corriente directa (d.c.). Se incorpora en la discusion ademas el potencial del metodo para el estudio de propiedades dielectricas en muestras de geometria general. Dado que solamente en cuerpos con geometria elipsoidal se conoce bien el campo electrico local, y con esto el momento bipolar inducido, para muestras de geometrias mas practicas (cilindros, cubos, discos) se acude a metodos de aproximacion. Finalmente, se discute el rango de mediciones y errores, y se presentan mediciones concretas, utilizando muestras de silicio.

  9. Detection of the high vibration origin in the body of an electrical generator driven by steam turbine applying diagnostic techniques; Deteccion del origen de alta vibracion en el cuerpo de un generador electrico accionado por turbinas de vapor aplicando tecnicas de diagnostico

    Energy Technology Data Exchange (ETDEWEB)

    Martinez Bravo, Fernando (Mexico)

    2007-11-15

    One of the problems that electric generators present is the high vibration due to causes that can go from simple mechanical unbalance, misalignment, mechanical relaxation, resonance or some other interaction that can influence in the system. In this document is presented the vibration analysis of an electric generator with a capacity of 350 MW, driven by a steam turbine composed of three stages (high pressure, intermediate pressure and low pressure) connected to the electric generator through a rigid connection. [Spanish] Uno de los problemas que se presentan en los generadores electricos es la alta vibracion debida a causas que pueden ir desde un simple desbalance mecanico, desalineamiento, aflojamiento mecanico, resonancia o alguna otra interaccion que pueda influir en el sistema. Se presenta en este documento el analisis de vibracion de un generador electrico con una capacidad de 350 MW, impulsado por una turbina de vapor compuesta de tres etapas (alta presion, presion intermedia y baja presion) acopladas al generador electrico a traves de un acoplamiento rigido.

  10. Desarrollo de un sistema integral de medios de diagnóstico y de métodos especiales para el control del estado técnico de los motores de aviacion de la F.A.P.

    OpenAIRE

    Nalvarte Simoni, Ronald Sandro; Nalvarte Simoni, Ronald Sandro

    2000-01-01

    La Fuerza Aérea del Perú clienta con una diversidad de motores tanto por su tipo, año de fabricación, país de procedencia y sistema de mantenimiento. Debido a la exigencia actual de una lata confiabilidad se hace necesario desarrollar nuevos métodos y medio de detención que permitan obtener una información real, amplia y profunda sobre la condición técnica del motor y sus diversos sistemas. Los MTG de aviación al no tener partes redundantes cualquier defecto critico produce la inopera...

  11. Technical application of current analysis to detect broken bars in three-phase induction motors at ArcelorMittal Tubarao; A aplicacao da tecnica de analise de corrente para deteccao de barras quebradas nos motores e inducao trifasicos na ArcelorMittal Tubarao

    Energy Technology Data Exchange (ETDEWEB)

    Antunes, Harison Araujo; Rocha, Rogerio Hubner; Oliveira Filho, Jessui de; Spinasse, Amarildo; Calente, Aderaldo [ArcelorMittal Tubarao, ES (Brazil). Dept. de Producao de Gusa e Energia

    2009-11-01

    Most modern machinery operates from three-phase induction motors that, in time, can develop faults. These faults can cause the machine to stop working or decrease its efficiency level in the productive process. When a motor suffers a fault it generates indication of defects in several ways: changing in vibrating signals, temperature variations, noises, and electromagnetic field alteration. Known as motor current signature analysis, this technique allows fault detection with mechanical and electrical origin in squirrel-cage three-phase induction motors. This technique is used within ArcelorMittal Tubarao to analyze and follow the motor's rotor broken bar tendency. At ArcelorMittal Tubarao, 450 motors are monitored, at 13200, 3300 and 440V and with power rating exceeding 55 KW. This paper will show the results of applying this technique during the last 2 years, as well as the several types of broken bars detected, fault characteristics, the type of load it operates in each fault encountered, and the fault range caused in the productive process. (author)

  12. Motor control for a brushless DC motor

    Science.gov (United States)

    Peterson, William J. (Inventor); Faulkner, Dennis T. (Inventor)

    1985-01-01

    This invention relates to a motor control system for a brushless DC motor having an inverter responsively coupled to the motor control system and in power transmitting relationship to the motor. The motor control system includes a motor rotor speed detecting unit that provides a pulsed waveform signal proportional to rotor speed. This pulsed waveform signal is delivered to the inverter to thereby cause an inverter fundamental current waveform output to the motor to be switched at a rate proportional to said rotor speed. In addition, the fundamental current waveform is also pulse width modulated at a rate proportional to the rotor speed. A fundamental current waveform phase advance circuit is controllingly coupled to the inverter. The phase advance circuit is coupled to receive the pulsed waveform signal from the motor rotor speed detecting unit and phase advance the pulsed waveform signal as a predetermined function of motor speed to thereby cause the fundamental current waveform to be advanced and thereby compensate for fundamental current waveform lag due to motor winding reactance which allows the motor to operate at higher speeds than the motor is rated while providing optimal torque and therefore increased efficiency.

  13. Survey of energy efficiency programs for motor systems in the industry and the main results of PROCEL Info; Levantamento dos programas de eficiencia energetica para sistemas motrizes na industria e os principais resultados do PROCEL Info

    Energy Technology Data Exchange (ETDEWEB)

    Naturesa, Jim Silva; Mariotoni, Carlos Alberto [Universidade Estadual de Campinas (GPESE/UNICAMP), SP (Brazil). Dept. de Recursos Hidricos, Energeticos e Ambientais. Grupo de Planejamento Energetico e Sistemas Eletricos; Menezes, Taciana de V.; Perrone, Fernando Pinto Dias; Lepetitgaland, Karla Kwiatkowski [Centrais Eletricas Brasileiras S.A. (ELETROBRAS), Brasilia, DF (Brazil)

    2008-07-01

    This article has as objective to compare the actual energy efficiency programs for the motor driven systems of Brazil, United States and European Community. This comparison will be restricted to the action of each program, considering that the countries present distinct economical, political and social aspects. The main results of PROCEL Info will be presented. (author)

  14. Estudio del empleo de un convertidor catalítico para las emisiones gaseosas en un motor de ignición por chispa usando etanol como combustible. // Study of the employment of a catalytic convertor for the gassy emissions in an spark ignition engine using et

    Directory of Open Access Journals (Sweden)

    K. C. R. Martins

    2005-01-01

    Full Text Available Con este trabajo de investigación se estudia el índice de emisiones gaseosas en un motor de ignición por chispa movido conetanol y se analiza el control de estas emisiones con aplicación de un convertidor catalítico platino/paladio (Pt/Pd en elsistema de descarga del motor. Fueron realizados ensayos dinamométricos de un motor de combustión interna MCI paraanalizar las emisiones y el control de estas, en condiciones operacionales, en función de la rotación y ángulo de avance deignición. El convertidor catalítico alcanzó un 75% de eficiencia cuando el ángulo de avance de ignición del motor aumentópara 16o. Se observó que en rotaciones de 2000 r.p.m el convertidor catalítico presentó mayor reducción de las emisionesde hidrocarburos no quemados HC, monóxido de carbono CO y óxidos de nitrógeno NOx. Con la aplicación de unconvertidor catalítico en un vehículo se debe estandarizar nuevas regulaciones en cuanto al ángulo de avance de igniciónpara optimizar el funcionamiento del motor.Palabras claves: Convertidor catalítico; emisiones de escape; eficiencia catalítica; etanol.____________________________________________________________________________Summary.With this investigation work the index of gassy emissions is studied in an spark ignition engine using ethanol, the control ofthese emissions is analyzed with application of a platinum/palladium (Pt/Pd catalytic convector in the engine dischargesystem. Rehearsals carried out in engines in order to analyze the emissions and the control of these, under operationalconditions, in function of the rotation and angle of ignition advance were carried out. The catalytic convector reaches 75%of efficiency when the ignition advance angle of the engine increased to 16o. It was observed that in rotations of 2000r.p.m the catalytic convector presented bigger reduction of the emissions of non-burnt hydrocarbons HC, monoxide ofcarbon CO and nitrogen oxides NOx. With the application of a

  15. Modelo integral de motores alternativos con aplicaciones docentes: motores diesel de inyección directa

    OpenAIRE

    Torres García, Miguel; Chacartegui, R.; Ruiz Marín, Juan José

    2002-01-01

    Con fines docentes se ha desarrollado un programa en MATLAB que simula el comportamiento de un MDID utilizando un modelo de combustión de una zona incluyendo renovación de la carga, de fugas y perdidas mecánicas. Para la validación del modelo se han comparado los resultados con los reales de varios motores a pesar de la falta de información detallada del motor. Las mayores diferencias aparecen para régimen de giro alto donde los efectos dinámicos, que este modelo no considera, son...

  16. System for the reliability analysis of the electric energy supply; Sistema para el analisis de confiabilidad del suministro de energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Perales, Favio; Martinez, Javier; Huesca, Francisco; Garcia, Norma; Nieva, Rolando [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1997-12-31

    A computer tool, developed for the reliability evaluation of the electric energy supply, considering the faults in the generation and transmission systems, is presented. The application of the tool in planning the expansion and operation of the electric systems, the methodology of the solution employed and the various functions it accounts for, are described. At the end some illustrative examples of its applications by means of the studies with a model of representative characteristics of the interconnected national system. [Espanol] Se presenta una herramienta computacional desarrollada para evaluar la confiabilidad del suministro de energia electrica, considerando las fallas en los sistemas de generacion y transmision. Se describen las aplicaciones de la herramienta en la planeacion de la expansion y de la operacion de sistemas electricos, la metodologia de solucion empleada y las diversas funciones con que cuenta. Al final se presentan algunos ejemplos ilustrativos de sus aplicaciones mediante estudios con un modelo de caracteristicas representativas del sistema interconectado nacional.

  17. System for the reliability analysis of the electric energy supply; Sistema para el analisis de confiabilidad del suministro de energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Perales, Favio; Martinez, Javier; Huesca, Francisco; Garcia, Norma; Nieva, Rolando [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1998-12-31

    A computer tool, developed for the reliability evaluation of the electric energy supply, considering the faults in the generation and transmission systems, is presented. The application of the tool in planning the expansion and operation of the electric systems, the methodology of the solution employed and the various functions it accounts for, are described. At the end some illustrative examples of its applications by means of the studies with a model of representative characteristics of the interconnected national system. [Espanol] Se presenta una herramienta computacional desarrollada para evaluar la confiabilidad del suministro de energia electrica, considerando las fallas en los sistemas de generacion y transmision. Se describen las aplicaciones de la herramienta en la planeacion de la expansion y de la operacion de sistemas electricos, la metodologia de solucion empleada y las diversas funciones con que cuenta. Al final se presentan algunos ejemplos ilustrativos de sus aplicaciones mediante estudios con un modelo de caracteristicas representativas del sistema interconectado nacional.

  18. Optimal restoration strategies based on heuristic techniques for electrical distribution networks; Estrategias de restablecimiento optimas basadas en tecnicas heuristicas para redes de distribucion electrica

    Energy Technology Data Exchange (ETDEWEB)

    Cruz Castrejon, J. A; Islas Perez, E; Espinosa Reza, A; Garcia Mendoza, R [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mails: adrian.cruz@iie.org.mx; eislas@iie.org.mx; aer@iie.org.mx; rgarcia@iie.org.mx

    2013-03-15

    In this paper we present a proposed solution to the problem of finding alternatives to reset faults in radial distribution networks power systems. This solution uses a deterministic method based on the definition of heuristics and whose main objectives are to improve execution time and solution quality. This search is based on the alternate repetition of two stages: a stage that attempts to reset the unconnected areas and other areas trying ballasting overloaded. [Spanish] En este articulo se presenta una propuesta de solucion al problema de busqueda de alternativas de restablecimiento para fallas en redes de distribucion radiales en sistemas electricos de potencia. Esta solucion utiliza un metodo deterministico basado en la definicion de heuristicas y cuyos objetivos principales son: mejorar el tiempo de ejecucion y calidad de la solucion. Esta busqueda se basa en la repeticion alternada de dos etapas: una etapa que intenta restablecer las areas desconectadas y otra que intenta deslastrar las areas sobrecargadas.

  19. RANCANG BANGUN SIMULASI PEWARNAAN SEPEDA MOTOR BERBASIS KOMPUTER

    Directory of Open Access Journals (Sweden)

    Hotmian Sitohang

    2016-10-01

    Full Text Available Belakang ini bisnis pewarnaan atau air brush motor sangat disukai. Setiap toko pengecatan atau pemasangan stiker selalu dipadati motor-motor yang baru maupun yang lama untuk  diwarnai atau di beri sticker agar warna asli tidak rusak dan pudar. Pewarnaan yang dilakukan pada sepeda motor meliputi pewarnaan body, tebeng depan, tebeng belakang, kaca lampu, spion, pelang dan bagian lainnya. Rata-rata para penggemar  pewarnaan kendaraan bermotor melakukan proses pewarnaan untuk tujuan  tertentu, misalnya motornya agar lebih menarik atau hanya ingin sekedar tampil beda.  Dari hasil observasi di Kota Palangka Raya terlihat setiap toko pewarnaan sepeda motor sangat diminati bahkan hampir setiap hari toko-toko pewarnaan penuh, sehingga membuat customer ngantri. Terkadang juga customer mau mewarnai tapi bingung menentukan warna apa yang sesuai dengan motornya. Sering kali juga terjadi sudah diwarnai ternyata tidak sesuai dengan cat awal motor atau warna nyorak. Penulis tertarik membuat simulasi pewarnaan motor berbasis komputer yang dimana nantinya akan dimasukkan gambar motor dan tinggal menyesuaikan seperti apa yang mau diwarnai. Bahkan disiapkan macam-macam pewarnaan motor yang populer saat ini. Aplikasi ini juga menyiapkan pewarnaan sebagian motor. Dimana kadang kala customer hanya mau mewarnai spion atau pelang, maka aplikasi ini akan memilih sesuai dengan yang mau diwarnai saja. Tujuan dari penelitian ini supaya mempermudah customer dalam menentukan pewarnaan motor, sedangkan manfaatnya untuk customer adalah lebih singkat waktu dan penyesuaian  warna motor.

  20. Electric motor handbook

    CERN Document Server

    Chalmers, B J

    2013-01-01

    Electric Motor Handbook aims to give practical knowledge in a wide range of capacities such as plant design, equipment specification, commissioning, operation and maintenance. The book covers topics such as the modeling of steady-state motor performance; polyphase induction, synchronous, and a.c. commutator motors; ambient conditions, enclosures, cooling and loss dissipation; and electrical supply systems and motor drives. Also covered are topics such as variable-speed drives and motor control; materials and motor components; insulation types, systems, and techniques; and the installation, sit

  1. Diseño y construcción de un banco de pruebas con autodiagnóstico mediante análisis digital de imagen para inyectores de motores a gasolina

    OpenAIRE

    García García, Cristian Leonardo; Rivera Campoverde, Néstor Diego

    2007-01-01

    Las ventajas que supone la inyección de combustible en relación con las exigencias de potencia, consumo, comportamiento de marcha, así como de limitación de elementos contaminantes en los gases de escape. Las razones de estas ventajas residen en el hecho de que la inyección permite una dosificación muy precisa del combustible en función de los estados de marcha y de carga del motor; teniendo en cuenta así mismo el medio ambiente, controlando la dosificación de tal forma que el contenido de el...

  2. Experimental Tailer like Thermal Lag Engine to obtain pressure and volume diagrams//Motor de Lag Térmico experimental tipo Tailer para obtener diagramas de presión y volumen

    Directory of Open Access Journals (Sweden)

    Carlos Fernández-Aballí-Altamirano

    2012-12-01

    Full Text Available AbstractThe Thermal Lag Engine (TLE patented by Peter Tailer’s is briefly introduced. The discussion about the thermodynamic working principle of this external combustion machine is presented. For this work the claims in literature have been studied by the authors to design and develop an experimental installation with the objective of measuring for the first time the pressure-volume (pV relationship of a TLE asdescribed by Tailer and West. The pV diagrams are presented here and support previous theoretical claims about the TLE. Their triangular form shows the effects described by West in the expansion and compression processes caused by the variation of the cold heat transfer area. Also the relationshipbetween the heat transfer capacity of the engine and its working frequency becomes apparent from the measurements, indicating that larger heater areas and limited cold heat transfer characteristics allow more work production per cycle at higher operating frequencies.Key words: thermal lag engine, pressure-volume diagrams, external combustion engines._______________________________________________________________________________ResumenSe introduce brevemente el Motor de Lag Térmico (MLT patentado por Peter Tailer y se esboza el debate científico sobre la termodinámica de esta máquina de combustión externa. A partir del estudio de los distintos puntos de vista los autores de este trabajo desarrollaron una instalación experimental con elobjetivo de medir por primera vez la relación presión-volumen (pV de un MLT como el descrito por Tailer y West. Los diagramas pV son presentados y apoyan los planteamientos teóricos previos sobre los MLT.Su forma triangular muestra los efectos descritos por West sobre los procesos de compresión y expansión debido a la exposición variable del área fría de intercambio de calor. Las mediciones pV muestran la relación que existe entre la capacidad de intercambio de calor del motor y su frecuencia de

  3. Handbook on linear motor application

    International Nuclear Information System (INIS)

    1988-10-01

    This book guides the application for Linear motor. It lists classification and speciality of Linear Motor, terms of linear-induction motor, principle of the Motor, types on one-side linear-induction motor, bilateral linear-induction motor, linear-DC Motor on basic of the motor, linear-DC Motor for moving-coil type, linear-DC motor for permanent-magnet moving type, linear-DC motor for electricity non-utility type, linear-pulse motor for variable motor, linear-pulse motor for permanent magneto type, linear-vibration actuator, linear-vibration actuator for moving-coil type, linear synchronous motor, linear electromagnetic motor, linear electromagnetic solenoid, technical organization and magnetic levitation and linear motor and sensor.

  4. Interacting adiabatic quantum motor

    Science.gov (United States)

    Bruch, Anton; Kusminskiy, Silvia Viola; Refael, Gil; von Oppen, Felix

    2018-05-01

    We present a field-theoretic treatment of an adiabatic quantum motor. We explicitly discuss a motor called the Thouless motor which is based on a Thouless pump operating in reverse. When a sliding periodic potential is considered to be the motor degree of freedom, a bias voltage applied to the electron channel sets the motor in motion. We investigate a Thouless motor whose electron channel is modeled as a Luttinger liquid. Interactions increase the gap opened by the periodic potential. For an infinite Luttinger liquid the coupling-induced friction is enhanced by electron-electron interactions. When the Luttinger liquid is ultimately coupled to Fermi liquid reservoirs, the dissipation reduces to its value for a noninteracting electron system for a constant motor velocity. Our results can also be applied to a motor based on a nanomagnet coupled to a quantum spin Hall edge.

  5. Chronic motor tic disorder

    Science.gov (United States)

    Chronic vocal tic disorder; Tic - chronic motor tic disorder ... Chronic motor tic disorder is more common than Tourette syndrome . Chronic tics may be forms of Tourette syndrome. Tics usually start ...

  6. Piezoelectric Motors, an Overview

    OpenAIRE

    Karl Spanner; Burhanettin Koc

    2016-01-01

    Piezoelectric motors are used in many industrial and commercial applications. Various piezoelectric motors are available in the market. All of the piezoelectric motors use the inverse piezoelectric effect, where microscopically small oscillatory motions are converted into continuous or stepping rotary or linear motions. Methods of obtaining long moving distance have various drive and functional principles that make these motors categorized into three groups: resonance-drive (piezoelectric ult...

  7. Electric Motor Thermal Management

    Energy Technology Data Exchange (ETDEWEB)

    Bennion, Kevin S [National Renewable Energy Laboratory (NREL), Golden, CO (United States)

    2017-09-01

    Thermal management enables more efficient and cost-effective motors. This Annual Merit Review presentation describes the technical accomplishments and progress in electric motor thermal management R&D over the last year. This project supports a broad industry demand for data, analysis methods, and experimental techniques to improve and better understand motor thermal management.

  8. Programmable dc motor controller

    Science.gov (United States)

    Hopwood, J. E.

    1982-11-01

    A portable programmable dc motor controller, with features not available on commercial instruments was developed for controlling fixtures during welding processes. The controller can be used to drive any dc motor having tachometer feedback and motor requirements not exceeding 30 volts, 3 amperes. Among the controller's features are delayed start time, upslope time, speed, and downslope time.

  9. Teste de estimulação repetitiva no músculo ancôneo para diagnóstico da miastenia grave: mapeamento da sua área de placa motora Repetitive stimulation test on the anconeus muscle for the diagnosis of myasthenia gravis: the mapping of its motor end-plate area

    Directory of Open Access Journals (Sweden)

    Maria das Graças Wanderley S. Coriolano

    2007-06-01

    Full Text Available OBJETIVO: Mapear a área de placa motora do músculo ancôneo para definir a melhor localização dos eletrodos de registro em testes de estimulação repetitiva (TER no diagnóstico dos distúrbios da transmissão neuromuscular. MÉTODO: Registramos o potencial de ação composto do músculo ancôneo sobre a pele que o recobre, após estimulação do ramo que o inerva. Analisando as formas de onda registradas em cada ponto da pele foi possível definir a área de placa. RESULTADOS: A área de placa motora do ancôneo é uma linha paralela à borda da ulna. O melhor local de colocação do eletrodo "ativo" de registro situa-se cerca de 2 cm distal ao olécrano e 1 cm lateral à borda da ulna. CONCLUSÃO: A realização de TER no músculo ancôneo é simples e bem tolerada. Com a estimulação do ancôneo o antebraço praticamente não se move, sendo o procedimento livre de artefatos de movimento.PURPOSE: To map the motor end-plate area of the anconeus muscle and define the best place for positioning the recording electrodes in repetitive stimulation tests (RST for the diagnosis of neuromuscular transmission disorders. METHOD: The compound muscle action potential of the anconeus was recorded after stimulating the motor branch of the radial nerve that innervates it. By analyzing the waveforms registered at each point of the skin we were able to define the motor end-plate area. RESULTS: The motor end-plate area of the anconeus is a line parallel to the ulna border. The best place for placing the "active" recording electrode is about 2cm distal to the olecranon and 1 cm lateral to the border of the ulna. CONCLUSION: Performing RST in the anconeus muscle is simple and well tolerated. Stimulation of the anconeus almost doesn't move the forearm and the procedure is virtually free of movement artifacts.

  10. Desempenho de misturas pré-aquecidas de óleo de soja cru e diesel como combustível para motores agrícolas Performance of preheated crude soybean oil-diesel blends as fuel in agricultural engines

    Directory of Open Access Journals (Sweden)

    José Fernando Schlosser

    2007-10-01

    Full Text Available O óleo de soja é um dos óleos vegetais que têm potencial de uso como combustível para motores diesel, pois é renovável, seguro e de fácil utilização. Em temperatura ambiente, o óleo cru apresenta uma viscosidade cerca de dez vezes maior que a do óleo diesel. Para reduzir a viscosidade do óleo de soja a níveis aceitáveis, é necessária uma temperatura de aquecimento em torno de aproximadamente 60°C ou misturá-lo com óleo diesel. O objetivo deste estudo foi avaliar o desempenho do óleo de soja cru e suas misturas com óleo diesel, pré-aquecidas antes da bomba injetora entre 57°C e 68°C, como combustível para motores diesel. O desempenho das misturas combustíveis foi avaliado num motor monocilíndrico de injeção indireta e comparado com o obtido pelo óleo diesel. Os ensaios de curta duração foram conduzidos entre 1.800 e 2.800rpm, sob condição de plena carga em dinamômetro hidráulico. Ensaios realizados a 68°C apresentaram sempre os melhores valores para torque, potência e consumo específico de combustível do que a 57°C. Uma mistura composta por 70% de óleo de soja e 30% de óleo diesel, aquecida a 68°C, apresentou os melhores resultados.Crude soybean oil is one of the vegetable oils that have potential for use as fuel for diesel engines. Soybean oil is renewable, and is safe and easy to handle. At room temperature crude oil has a viscosity about ten times higher than that of diesel oil. To lower soybean oil's viscosity to the acceptable levels a heating temperature at least 60°C is needed or blending with diesel fuel. The objective of this study was evaluating the soybean oil and blends performance as a fuel for diesel engines. On both crude soybean oil and soybean oil blends were used pre-heating temperature levels on the range between 57°C and 68°C, before fuel pump. The performance of the fuel blends were evaluated in a single cylinder indirect injection diesel engine and compared with the performance

  11. Diagnóstico de fallos en la combustión para motores de combustión interna alternativos diésel por análisis de vibraciones

    OpenAIRE

    Criollo Jadán, Olger Rodrigo; Matute Bravo, Héctor Marcelo

    2014-01-01

    Los motores diésel y sus constantes innovaciones en la gestión electrónica y de control en el proceso de combustión, a través de sistemas sofisticados de inyección directa exigen un adecuado mantenimiento; el análisis de vibraciones a través del estudio de la imagen espectral producto de la aplicación del algoritmo computacional de la transformada rápida de Fourier de la señal en el tiempo se ha convertido en una técnica a ser aplicada. The diesel engines and their constant innovation in t...

  12. Motor/generator

    Science.gov (United States)

    Hickam, Christopher Dale [Glasford, IL

    2008-05-13

    A motor/generator is provided for connecting between a transmission input shaft and an output shaft of a prime mover. The motor/generator may include a motor/generator housing, a stator mounted to the motor/generator housing, a rotor mounted at least partially within the motor/generator housing and rotatable about a rotor rotation axis, and a transmission-shaft coupler drivingly coupled to the rotor. The transmission-shaft coupler may include a clamp, which may include a base attached to the rotor and a plurality of adjustable jaws.

  13. Implementación de un sistema de inyección multipunto a un motor Daewoo G15SF y construcción de un banco didáctico funcional para el laboratorio de motores de combustión interna de la Carrera de Ingeniería Mecánica Automotriz

    OpenAIRE

    Barbecho Quichimbo, Fernando Anibal; Matute Flores, Mauricio Enrique; Pachacama Gualotuña, David Paúl

    2010-01-01

    Es sabido, que una mejor distribución de carburante, y un mejor llenado de los cilindros, derivan en ahorro de combustible, emisiones menos contaminantes, y en general, mejor funcionamiento del motor, por lo que desde los inicios de esta investigación, surgió la necesidad de buscar un sistema óptimo que se adapte a los requerimientos planteados. El procedimiento por el cual optamos, es el de profundizar la investigación desde la perspectiva de la ingeniería, la metodología aplicada se basó...

  14. Piezoelectric Motors, an Overview

    Directory of Open Access Journals (Sweden)

    Karl Spanner

    2016-02-01

    Full Text Available Piezoelectric motors are used in many industrial and commercial applications. Various piezoelectric motors are available in the market. All of the piezoelectric motors use the inverse piezoelectric effect, where microscopically small oscillatory motions are converted into continuous or stepping rotary or linear motions. Methods of obtaining long moving distance have various drive and functional principles that make these motors categorized into three groups: resonance-drive (piezoelectric ultrasonic motors, inertia-drive, and piezo-walk-drive. In this review, a comprehensive summary of piezoelectric motors, with their classification from initial idea to recent progress, is presented. This review also includes some of the industrial and commercial applications of piezoelectric motors that are presently available in the market as actuators.

  15. Motor degradation prediction methods

    Energy Technology Data Exchange (ETDEWEB)

    Arnold, J.R.; Kelly, J.F.; Delzingaro, M.J.

    1996-12-01

    Motor Operated Valve (MOV) squirrel cage AC motor rotors are susceptible to degradation under certain conditions. Premature failure can result due to high humidity/temperature environments, high running load conditions, extended periods at locked rotor conditions (i.e. > 15 seconds) or exceeding the motor`s duty cycle by frequent starts or multiple valve stroking. Exposure to high heat and moisture due to packing leaks, pressure seal ring leakage or other causes can significantly accelerate the degradation. ComEd and Liberty Technologies have worked together to provide and validate a non-intrusive method using motor power diagnostics to evaluate MOV rotor condition and predict failure. These techniques have provided a quick, low radiation dose method to evaluate inaccessible motors, identify degradation and allow scheduled replacement of motors prior to catastrophic failures.

  16. Neuroplasticity & Motor Learning

    DEFF Research Database (Denmark)

    Jensen, Jesper Lundbye

    Practice of a new motor task is usually associated with an improvement in performance. Indeed, if we stop practicing and return the next day to the same task, we find that our performance has been maintained and may even be better than it was at the start of the first day. This improvement...... is a measure of our ability to form and store a motor memory of the task. However, the initial memory of the task is labile and may be subject to interference. During and following motor learning plastic changes occur within the central nervous system. On one hand these changes are driven by motor practice......, on the other hand the changes underlie the formation of motor memory and the retention of improved motor performance. During motor learning changes may occur at many different levels within the central nervous system dependent on the type of task and training. Here, we demonstrate different studies from our...

  17. System Aprend-e for the management of learning objects of support to the CFE operation; Sistema Aprend-e para la gestion de objetos de aprendizaje de apoyo a la operacion de la CFE

    Energy Technology Data Exchange (ETDEWEB)

    Argotte Ramos, Liliana Paz; Rodriguez Ortiz; Guillermo [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico); Paredes Rivera, Jaime Israel [Comision Federal de Electricidad (CFE) (Mexico)

    2009-07-01

    In this article the system Aprend-e is described as an application of the technology of Learning Objects (LO) integrated to the qualification of the Comision Federal de Electricidad (CFE) personnel, company of the electrical sector in Mexico, as well as to promote the self-training based on LO. An introduction to standard SCORM and the proposed additions by the CFE to the goal-data is included. [Spanish] En este articulo se describe el sistema Aprend-e, como una aplicacion de la tecnologia de Objetos de Aprendizaje (OA) integrada a la capacitacion del personal de la Comision Federal de Electricidad (CFE), empresa del sector electrico en Mexico, asi como para promover el autoaprendizaje basado en OA. Se incluye una introduccion al estandar SCORM y las adiciones propuestas por la CFE a los metadatos.

  18. Diseño y cálculo de un reductor de velocidad para un polipasto de uso industrial de engranajes cilíndricos de dientes helicoidales, con hipótesis de cálculo para los dos sentidos de giro de motor

    OpenAIRE

    SORO SALA, SANTIAGO

    2016-01-01

    [ES] El objetivo de este trabajo final de grado es el de diseñar y calcular un reductor de velocidades, de uso industrial, para un polipasto de cadena. El reductor de velocidades será de dos etapas, de engranajes cilíndricos de dientes helicoidales. Se realizan los cálculos para las hipótesis de giro horario y antihorario, Esto se debe a que este tipo de engranajes, transmiten esfuerzos axiales, de dirección variable según su sentido de giro. En el proceso de cálculo del red...

  19. Bronchopulmonary dysplasia as a predictor factor for motor alteration at 6 months corrected age in premature infants Displasia broncopulmonar como fator predisponente para alterações motoras aos 6 meses em prematuros

    Directory of Open Access Journals (Sweden)

    Priscila Silveira Martins

    2010-10-01

    Full Text Available OBJECTIVE: The study aimed to assess bronchopulmonary dysplasia (BPD as a predisposing factor for alteration in the psychomotor development index (PDI in premature infants and verify the incidence of neuromotor alterations at 6 months corrected age. METHOD: This was a prospective cohort study that followed the neuromotor development of 152 very low birth weight premature infants, with psychomotor development index as the outcome. The study used the Bayley Scale of Infant Development at 6 months corrected age, and neurological examination. RESULTS: Incidence of BPD was 13.2% (n=20. Logistic regression analysis showed an association between BPD and altered psychomotor development index (OR 3.98; 95%CI: 1.04-15.1 after adjusting for confounding variables. Neurological examination was altered in 67.1% of the 152 infants. CONCLUSION: Bronchopulmonary dysplasia acted as an independent predisposing factor for alteration in the psychomotor development index in premature infants at 6 months corrected age.OBJETIVO: Avaliar a displasia broncopulmonar (DBP como fator predisponente para alteração no índice de desenvolvimento psicomotor em prematuros e verificar a incidência das alterações neuromotoras aos 6 meses de idade corrigida. MéTODO: Estudo de coorte prospectivo que acompanhou o desenvolvimento neuromotor de 152 prematuros de muito baixo peso, cujo desfecho foi o desenvolvimento psicomotor. Utilizou-se a Bayley Scale of Infant Development aos 6 meses de idade corrigida e exame neurológico. RESULTADOS: A incidência de DBP foi de 13,2% (n=20. A análise de regressão logística mostrou associação entre a DBP e alteração no índice de desenvolvimento psicomotor (RC 3,98 IC 95%:1,04-15,1 após ajuste para as variáveis de confundimento. O exame neurológico apresentou-se alterado em 67,1% das 152 crianças. CONCLUSão: A displasia broncopulmonar atuou como fator predisponente independente para alteração no índice de desenvolvimento

  20. Development of an electro-thermal model for ZnO surge arrester under contamination; Desarrollo de un modelo electro-termico para apartarrayos de ZnO bajo contaminacion

    Energy Technology Data Exchange (ETDEWEB)

    Guardado Zavala, J.L.; Moreno Barraza, M.; Zazueta Pena, H.; Venegas Rebollar, V.; Melgoza Vazquez, E. [Instituto Tecnologico de Morelia, Morelia, Michoacan (Mexico)]. E-mail: lguarda@prodigy.net.mx; hzazuetapea@yahoo.com; vvenegas@yahoo.com; emelgoza@iimorelia.edu.mx

    2010-01-15

    An electro-thermal model for a Zinc Oxide (ZnO) surge arrester under contamination test is presented. The model is based in three sub-models: electrical, thermal and contamination, which interact in order to obtain the surge arrester performance under contamination tests. The electrical model is obtained from measurements and is based on a capacitance and a non-linear resistor. The thermal model takes into account the heat generated and dissipated by the column of varistors and its surroundings. The contamination is represented by dynamic impedance obtained from measurements in the arrester column during contamination tests. The full model is validated by calculating the temperature increase during contamination tests carried out in a two units ZnO surge arrester, class 190 kV. Finally, the results of the effect of several design and construction parameters in the voltage and temperature distribution in the arrester column during contamination tests are presented. [Spanish] Se presenta el modelo electro-termico para un apartarrayos de Oxido de Zinc (ZnO) durante pruebas de contaminacion. El modelo esta compuesto de tres sub-modelos: electrico, termico y de contaminacion, los cuales interactuan armonicamente para obtener el comportamiento del apartarrayos durante pruebas de contaminacion. El modelo electrico se obtiene de mediciones y esta compuesto de una capacitancia y una resistencia no-lineal. El modelo termico considera el calor generado y disipado en la columna de varistores y su entorno. La contaminacion se representa como una impedancia dinamica, cuyos valores se obtienen de mediciones en la columna del apartarrayos durante pruebas de contaminacion. El modelo se valida determinando el incremento de temperatura durante pruebas de contaminacion en un apartarrayos de ZnO de dos unidades clase 1990 kV. Finalmente, se presentan los resultados del impacto de diversos parametros de diseno y construccion en la distribucion de voltaje y temperatura en el apartarrayos

  1. Intervención psicológica para la detección y manejo de estilos atribucionales en dos deportes de motor: rally de automóviles y karting competitivo

    Directory of Open Access Journals (Sweden)

    Benito Urra Tobar

    2008-01-01

    Full Text Available Tradicionalmente, la psicología del deporte ha promovido la idea que los deportistas atribuyan su desempeño a factores internos para favorecer su implicancia en la actividad deportiva. El presente estudio entrega una visión exploratoria sobre los estilos atribucionales predominantes en una muestra de 22 deportistas que practican dos disciplinas motorizadas. Los resultados indican la prevalencia de un estilo atribucional externo tanto en las situaciones de logro como de no logro deportivo. Se entrega, además, una descripción de las principales causas de rendimiento identificadas a la vez que se entregan sugerencias de intervención a partir de la influencia real que tienen los factores externos en el desempeño del deportista dadas las particularidades de este tipo de disciplinas.

  2. Assessment of the greenhouse gases in Mexico: Importance of the electric sector; Inventario de gases de invernadero en Mexico: Importancia del sector electrico

    Energy Technology Data Exchange (ETDEWEB)

    Sheinbaum Pardo, Claudia [Instituto de Ingenieria, UNAM, Mexico, D. F. (Mexico)

    1996-12-31

    In this paper are presented the principal results of the various studies on energy end uses developed by the Grupo de Energia y Ambiente del Instituto de Ingenieria de la Universidad Nacional Autonoma de Mexico (UNAM Group of Energy and Environment) for years 1987 and 1993, emphasizing on the emissions originated by the generation of electricity and for the following greenhouse effect gases: carbon dioxide (CO{sub 2}), carbon monoxide (CO), nitrogen oxides (NOx) and methane (CH{sub 4}). Also, a comparison is presented among Mexico and other Latin America countries based on statistics of OLADE (Latin American Organization of Energy) [Espanol] En este trabajo se presentan los principales resultados de estudios diversos sobre usos finales de energia desarrollados por el Grupo de Energia y Ambiente del Instituto de Ingenieria de la Universidad Nacional Autonoma de Mexico (UNAM) para los anos 1987 y 1993, poniendo enfasis en las emisiones debidas a la generacion de electricidad y para los siguientes gases de efecto invernadero: bioxido de carbono (CO{sub 2}), monoxido de carbono (CO), oxidos de nitrogeno (NOx) y metano (HC{sub 4}). Asi mismo se presenta una comparacion entre Mexico y otros paises de Latinoamerica basado en estadisticas de la Organizacion Latinoamericana de Energia

  3. Assessment of the greenhouse gases in Mexico: Importance of the electric sector; Inventario de gases de invernadero en Mexico: Importancia del sector electrico

    Energy Technology Data Exchange (ETDEWEB)

    Sheinbaum Pardo, Claudia [Instituto de Ingenieria, UNAM, Mexico, D. F. (Mexico)

    1997-12-31

    In this paper are presented the principal results of the various studies on energy end uses developed by the Grupo de Energia y Ambiente del Instituto de Ingenieria de la Universidad Nacional Autonoma de Mexico (UNAM Group of Energy and Environment) for years 1987 and 1993, emphasizing on the emissions originated by the generation of electricity and for the following greenhouse effect gases: carbon dioxide (CO{sub 2}), carbon monoxide (CO), nitrogen oxides (NOx) and methane (CH{sub 4}). Also, a comparison is presented among Mexico and other Latin America countries based on statistics of OLADE (Latin American Organization of Energy) [Espanol] En este trabajo se presentan los principales resultados de estudios diversos sobre usos finales de energia desarrollados por el Grupo de Energia y Ambiente del Instituto de Ingenieria de la Universidad Nacional Autonoma de Mexico (UNAM) para los anos 1987 y 1993, poniendo enfasis en las emisiones debidas a la generacion de electricidad y para los siguientes gases de efecto invernadero: bioxido de carbono (CO{sub 2}), monoxido de carbono (CO), oxidos de nitrogeno (NOx) y metano (HC{sub 4}). Asi mismo se presenta una comparacion entre Mexico y otros paises de Latinoamerica basado en estadisticas de la Organizacion Latinoamericana de Energia

  4. Motor degradation prediction methods

    International Nuclear Information System (INIS)

    Arnold, J.R.; Kelly, J.F.; Delzingaro, M.J.

    1996-01-01

    Motor Operated Valve (MOV) squirrel cage AC motor rotors are susceptible to degradation under certain conditions. Premature failure can result due to high humidity/temperature environments, high running load conditions, extended periods at locked rotor conditions (i.e. > 15 seconds) or exceeding the motor's duty cycle by frequent starts or multiple valve stroking. Exposure to high heat and moisture due to packing leaks, pressure seal ring leakage or other causes can significantly accelerate the degradation. ComEd and Liberty Technologies have worked together to provide and validate a non-intrusive method using motor power diagnostics to evaluate MOV rotor condition and predict failure. These techniques have provided a quick, low radiation dose method to evaluate inaccessible motors, identify degradation and allow scheduled replacement of motors prior to catastrophic failures

  5. DISEÑO Y CONSTRUCCIÓN DE UN PROTOTIPO DE INTERFAZ CEREBRO-COMPUTADOR PARA FACILITAR LA COMUNICACIÓN DE PERSONAS CON DISCAPACIDAD MOTORA DESENHO E CONSTRUÇÃO DE UM PROTÓTIPO DE INTERFACE CÉREBRO-COMPUTADOR PARA FACILITAR A COMUNICAÇÃO DE PESSOAS COM INCAPACIDADE MOTORA DESIGN AND CONSTRUCTION OF A BRAIN-COMPUTER INTERFACE PROTOTYPE TO FACILITATE THE COMMUNICATION OF PEOPLE WITH MOTOR DISABILITY.

    Directory of Open Access Journals (Sweden)

    CAROLINA ARBOLEDA

    2009-07-01

    ário escreva palavras ou elabore mensagens com os ícones. Para processar os sinais (filtragem, dizimado, entre outros se utilizaram os programas BCI2000 e MATLAB 7.0. Este último se empregou para programar três algoritmos lineais de translação (análise linear do discriminante, solução por mínimos quadrados e análise linear do discriminante passo a passo que permitissem traduzir os potenciais evocados em sinais de comunicação.A brain-computer interface (BCI is a communication system that translates a brain signal (e.g. sensorimotor rhythms, evoked potentials into a control signal and, therefore, constitutes an innovative communication alternative for people with severe motor disability (such as patients with amyotrophic lateral sclerosis. This project proposes the development of a BCI prototype based on the recording of P300 cognitive potentials using electroencephalography. The prototype uses a six-channel electroencephalograph to acquire the signals, and through a visual stimulation matrix containing the letters of the alphabet and icons associated to each one gives the user the possibility of writing words or elaborating messages with the icons. To process the signals (filtering and decimation, among other methods, the software BCI2000 and MATLAB 7.0 were used. The latter was used to program three different linear translation algorithms (linear discriminant analysis, least squares analysis and stepwise linear discriminant analysis, in order to translate the recorded evoked potentials into communication signals.

  6. Análise da validade de critério da Avaliação da Coordenação e Destreza Motora: ACOORDEM para crianças de 7 e 8 anos de idade Criterion validity of the Motor Coordination and Dexterity Assessment: MCDA for 7- and 8-years old children

    Directory of Open Access Journals (Sweden)

    Ana A. Cardoso

    2012-02-01

    Full Text Available CONTEXTUALIZAÇÃO: O Transtorno do Desenvolvimento da Coordenação (TDC se caracteriza por prejuízo no desenvolvimento da coordenação motora, com impacto nas atividades de vida diária e desempenho acadêmico. A Avaliação da Coordenação e Destreza Motora (ACOORDEM vem sendo criada para oferecer aos profissionais de reabilitação brasileiros instrumentação confiável e válida para detecção do TDC. OBJETIVO: Examinar a validade de critério da ACOORDEM. MÉTODOS: Cento e oitenta e uma crianças de 7 e 8 anos da região metropolitana de Belo Horizonte, MG, Brasil, pré-selecionadas pelo Developmental Coordination Disorder Questionnaire (DCDQ-Brasil, foram avaliadas com a ACOORDEM e com o Movement Assessment Battery for Children (MABC-II. A validade concorrente foi avaliada pelo índice de Correlação de Spearman e a validade preditiva, pelos valores de sensibilidade (S, especificidade (E, valor de predição positivo (VPP e valor de predição negativo (VPN. Curvas ROC foram realizadas para determinar o ponto de corte ótimo da ACOORDEM. RESULTADOS: A Correlação de Spearman entre os escores totais da ACOORDEM e do MABC-II foi de 0,596 (p=0,000 aos 7 e 0,730 (p=0,000 aos 8 anos. O ponto de corte da ACOORDEM definido pelas curvas ROC se aproximou do percentil 40, o que corresponde a S de 0,91 e 0,74 e E de 0,74 e 0,90 aos 7 e 8 anos, respectivamente. CONCLUSÃO: Resultados apontam valores moderados de validade concorrente e preditiva da ACOORDEM. Estudos futuros devem reexaminar os pontos de corte da ACOORDEM em amostra aleatória, representativa de crianças brasileiras de 4 a 8 anos de idade. A validade preditiva para TDC do instrumento completo deve ser reexaminada em amostras clínicas bem definidas.BACKGROUND: Developmental Coordination Disorder (DCD is characterized by impaired development of motor coordination, with impact on daily life activities and academic performance. The Motor Coordination and Dexterity Assessment (MCDA

  7. Cryogenic Electric Motor Tested

    Science.gov (United States)

    Brown, Gerald V.

    2004-01-01

    Technology for pollution-free "electric flight" is being evaluated in a number of NASA Glenn Research Center programs. One approach is to drive propulsive fans or propellers with electric motors powered by fuel cells running on hydrogen. For large transport aircraft, conventional electric motors are far too heavy to be feasible. However, since hydrogen fuel would almost surely be carried as liquid, a propulsive electric motor could be cooled to near liquid hydrogen temperature (-423 F) by using the fuel for cooling before it goes to the fuel cells. Motor windings could be either superconducting or high purity normal copper or aluminum. The electrical resistance of pure metals can drop to 1/100th or less of their room-temperature resistance at liquid hydrogen temperature. In either case, super or normal, much higher current density is possible in motor windings. This leads to more compact motors that are projected to produce 20 hp/lb or more in large sizes, in comparison to on the order of 2 hp/lb for large conventional motors. High power density is the major goal. To support cryogenic motor development, we have designed and built in-house a small motor (7-in. outside diameter) for operation in liquid nitrogen.

  8. Hybrid vehicle motor alignment

    Science.gov (United States)

    Levin, Michael Benjamin

    2001-07-03

    A rotor of an electric motor for a motor vehicle is aligned to an axis of rotation for a crankshaft of an internal combustion engine having an internal combustion engine and an electric motor. A locator is provided on the crankshaft, a piloting tool is located radially by the first locator to the crankshaft. A stator of the electric motor is aligned to a second locator provided on the piloting tool. The stator is secured to the engine block. The rotor is aligned to the crankshaft and secured thereto.

  9. Diseño y construcción de un banco de pruebas para las boquillas de inyección de combustibles de los motores PW 100 y PT6

    Directory of Open Access Journals (Sweden)

    Arnold Escobar

    2007-01-01

    Full Text Available Debido a los altos costos en las infraestructuras requeridas en la industria aeronáutica, se ha procurado reducir los costos y aumentar su productividad, desarrollando así programas de mejoramiento continuo, tales como investigación, con el fin de lograr soluciones mas eficientes a dichas problemáticas. El proyecto en este artículo describe el diseño y construcción de un banco de pruebas para inyectores, que pretende mejorar la rentabilidad al realizar el mantenimiento de las boquillas de inyección de combustible al interior de las propias organizaciones de mantenimiento, o por lo menos dentro del país, en lugar de enviarlas a talleres de mantenimiento en el exterior, los cuales prestan sus servicios a elevados costos y demorada entrega. Si los resultados son favorables, se podría iniciar una nueva época de la Industria Aeronáutica de un mayor desarrollo tecnológico y, como consecuencia, una mejor rentabilidad económica en el proceso de mantenimiento.

  10. New model for the regulation of activity and distribution in the Spanish electrical sector; Un nuevo modelo para la regulacion de la actividad de distribucion del sector electrico en Espana

    Energy Technology Data Exchange (ETDEWEB)

    Reinoso y Reino, V.

    1998-12-01

    In the context of the segregation of the product (kWh) and the service of electricity transport and distribution, the establishment of a retributive model for distribution becomes especially relevant, even fundamental within a free market for generators and consumers. The liberalization of distribution is established by means of the greed access of third parties to the network. Electricity distribution in Spain has traditionally be badly remunerated and incomes have not been sufficient to support the segregation of activities. These inequalities should be resolved by means of a retribution model for distribution that reflects the real cost of this activity and which contemplates the specific characteristics of the different zones of the market. (Author)

  11. Use of the Regenerative Braking of Suburban Trains for Fast DC Charging of Electric Cars; Utilizacion del frenado regenerativo de trenes suburbanos para la recarga rapida de automoviles electricos en corriente continua

    Energy Technology Data Exchange (ETDEWEB)

    Lafoz, M.; Concha, P.; Navarro, G.; Blanco, M.; Rodriguez, C.

    2014-04-01

    This article discusses the problem of the electric vehicles fast charge from the perspective of the need for a high voltage power supply in areas where it is hard to access power transmission infrastructures, and how this problem can be solved with a system based on the supply of power from suburban train lines, together with energy storage systems and where everything is governed by optimized control strategies to maximize the energy use as much as possible. (Author)

  12. Pressupostos de uma avaliação de contexto existencial da violência escolar para o planejamento de condutas motoras educacionais voltadas para pré-adolescentes de classes de progressão Presupuesto de una evaluación del contexto existencial de la violencia en la escuela para la planificación de conductas motoras educativas dirigidas hacia preadolescentes de la clase de progresión Estimate of an existential context evaluation of the school violence for the planning of educational motor behaviors to pré-adolescentes of progression classrooms

    Directory of Open Access Journals (Sweden)

    Indinalva Nepomuceno Fajardo

    2006-03-01

    ños, preadolescentes y adolescentes, en situación de riesgo social, se han constituido en un fenómeno de la naturaleza moral que viene propagándose en los pasados años en Brasil. Tal hecho ha alcanzado a diversos casos de la sociedad brasileña, entre éstos el, de muchas escuelas, consistiendo en un gran desafío y preocupación por la sociedad y, más específicamente, por los responsables para estas instituciones. Por esta razón viene siendo objeto de la política pública que, de una cierta manera, buscan para presentar alternativas estratégicas para la solución de un problema de tal magnitud. Siendo así, este trabajo tenía para que el objetivo presente una reflexión referente al tema exactamente, presentando una evaluación del contexto existencial de la violencia el cual podría contribuir con alguno estimado para la planificación de los comportamientos educativos del motor si dirigidas hacia preadolescentes con retraso en el desarrollo del cognitivo y el cual, para esto, fueron registrados en Clase s de Progresión. Tal evaluación fue desarrollada de una comprensión existencial fenomenológica de los preadolescentes de 9 a los 12 años de edad, registrados en la clase de progresión de la escuela Municipal Dr. Mário Augusto T. de Freitas, situada en Río de Janeiro, en el cual el comportamiento violento de alumnos es una manifestación actual. En esta comprensión una correlación lógica entre las causas y las consecuencias fue establecida relacionado él al problema, usándose como ayuda teórica el pensamiento de José Ortega Y Gasset del cual manifieste la necesidad si conocer el Ser a partir de su circunstancia existencial, evidenciándose que los entes en cuestión viven en un contexto socio-histórico de circunstancias adversas, que pueden ser conducidas en la consideración como siendo, de cierta forma, las causas de la violencia en la escuela y otros ambientes inherentes a sus vidas.The violent behaviors of children, pay-adolescents and adolescents, in

  13. Estimador de la carga (aire-GNC) aspirada por el motor de combustión interna duranrte condiciones transitorias de operación.

    OpenAIRE

    Barbieri, Andrés; Samat, David; Molina, Héctor

    2005-01-01

    Durante las operaciones transitorias de un motor, se requiere de una exacta relación aire combustible, a los efectos de optimizar la eficiencia y reducir las emisiones. Motores que de fabrica no están acondicionados para funcionar con gas y son transformados para funcionar con combustibles gaseosos (GNC) en los que se utiliza para su dosado mezcladores tipo Venturi, no brindan una respuesta satisfactoria para las condiciones antes expuestas. El presente trabajo describe y desarrol...

  14. Modeling Induction Motor Imbalances

    DEFF Research Database (Denmark)

    Armah, Kabenla; Jouffroy, Jerome; Duggen, Lars

    2016-01-01

    This paper gives a study into the development of a generalized model for a three-phase induction motor that offers flexibility of simulating balanced and unbalanced parameter scenarios. By analyzing the interaction of forces within the motor, we achieve our main objective of deriving the system d...

  15. Artificial molecular motors

    NARCIS (Netherlands)

    Kassem, Salma; van Leeuwen, Thomas; Lubbe, Anouk S.; Wilson, Miriam R.; Feringa, Ben L.; Leigh, David A.

    2017-01-01

    Motor proteins are nature's solution for directing movement at the molecular level. The field of artificial molecular motors takes inspiration from these tiny but powerful machines. Although directional motion on the nanoscale performed by synthetic molecular machines is a relatively new

  16. To What Extent Can Motor Imagery Replace Motor Execution While Learning a Fine Motor Skill?

    NARCIS (Netherlands)

    Sobierajewicz, Jagna; Szarkiewicz, Sylwia; Prekoracka-Krawczyk, Anna; Jaskowski, Wojciech; van der Lubbe, Robert Henricus Johannes

    2016-01-01

    Motor imagery is generally thought to share common mechanisms with motor execution. In the present study, we examined to what extent learning a fine motor skill by motor imagery may substitute physical practice. Learning effects were assessed by manipulating the proportion of motor execution and

  17. Higher Efficiency HVAC Motors

    Energy Technology Data Exchange (ETDEWEB)

    Flynn, Charles Joseph [QM Power, Inc., Kansas City, MO (United States)

    2018-02-13

    The objective of this project was to design and build a cost competitive, more efficient heating, ventilation, and air conditioning (HVAC) motor than what is currently available on the market. Though different potential motor architectures among QMP’s primary technology platforms were investigated and evaluated, including through the building of numerous prototypes, the project ultimately focused on scaling up QM Power, Inc.’s (QMP) Q-Sync permanent magnet synchronous motors from available sub-fractional horsepower (HP) sizes for commercial refrigeration fan applications to larger fractional horsepower sizes appropriate for HVAC applications, and to add multi-speed functionality. The more specific goal became the research, design, development, and testing of a prototype 1/2 HP Q-Sync motor that has at least two operating speeds and 87% peak efficiency compared to incumbent electronically commutated motors (EC or ECM, also known as brushless direct current (DC) motors), the heretofore highest efficiency HVACR fan motor solution, at approximately 82% peak efficiency. The resulting motor prototype built achieved these goals, hitting 90% efficiency and .95 power factor at full load and speed, and 80% efficiency and .7 power factor at half speed. Q-Sync, developed in part through a DOE SBIR grant (Award # DE-SC0006311), is a novel, patented motor technology that improves on electronically commutated permanent magnet motors through an advanced electronic circuit technology. It allows a motor to “sync” with the alternating current (AC) power flow. It does so by eliminating the constant, wasteful power conversions from AC to DC and back to AC through the synthetic creation of a new AC wave on the primary circuit board (PCB) by a process called pulse width modulation (PWM; aka electronic commutation) that is incessantly required to sustain motor operation in an EC permanent magnet motor. The Q-Sync circuit improves the power factor of the motor by removing all

  18. Linear motor coil assembly and linear motor

    NARCIS (Netherlands)

    2009-01-01

    An ironless linear motor (5) comprising a magnet track (53) and a coil assembly (50) operating in cooperation with said magnet track (53) and having a plurality of concentrated multi-turn coils (31 a-f, 41 a-d, 51 a-k), wherein the end windings (31E) of the coils (31 a-f, 41 a-e) are substantially

  19. Spinal cord: motor neuron diseases.

    Science.gov (United States)

    Rezania, Kourosh; Roos, Raymond P

    2013-02-01

    Spinal cord motor neuron diseases affect lower motor neurons in the ventral horn. This article focuses on the most common spinal cord motor neuron disease, amyotrophic lateral sclerosis, which also affects upper motor neurons. Also discussed are other motor neuron diseases that only affect the lower motor neurons. Despite the identification of several genes associated with familial amyotrophic lateral sclerosis, the pathogenesis of this complex disease remains elusive. Copyright © 2013 Elsevier Inc. All rights reserved.

  20. The anemodata 1-IIE. Automatic system for wind data acquisition; El anemodata 1-IIE. Sistema automatico para la adquisicion de datos de viento

    Energy Technology Data Exchange (ETDEWEB)

    Borja, Marco Antonio; Parkman Cuellar, Pablo A [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1987-12-31

    Wind is an inexhaustible energy source. To study its behavior in order to develop research projects and apply new technologies connected to its maximum development is one of the activities carried on at the Instituto de Investigaciones Electricas (IIE). As a part of such activities, the equipment Anemodata-1-IIE was designed and built for the wind velocity and direction data acquisition. The Anemodata-1-IIE is the result of the work that the Departamento de Fuentes no Convencionales (Non-Conventional Energy Sources of the Energy Sources Department) carries on regarding the development of electric equipment for the anemometry. [Espanol] Una fuente inagotable de energia es el viento. Estudiar su comportamiento para desarrollar proyectos de investigacion y aplicar nuevas tecnologias vinculadas con su maximo aprovechamiento es una de las actividades que se realizan en el Instituto de Investigaciones Electricas (IIE). Como parte de dichas actividades, se diseno y construyo el equipo Anemodata-1-IIE para la adquisicion de datos de velocidad y direccion del viento. El anemodata-1-IIE es un resultado de los trabajos que el Departamento de Fuentes no Convencionales, de la division de Fuentes de Energia, lleva a cabo en torno al desarrollo de equipo electrico para anemometria.

  1. The anemodata 1-IIE. Automatic system for wind data acquisition; El anemodata 1-IIE. Sistema automatico para la adquisicion de datos de viento

    Energy Technology Data Exchange (ETDEWEB)

    Borja, Marco Antonio; Parkman Cuellar, Pablo A. [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1986-12-31

    Wind is an inexhaustible energy source. To study its behavior in order to develop research projects and apply new technologies connected to its maximum development is one of the activities carried on at the Instituto de Investigaciones Electricas (IIE). As a part of such activities, the equipment Anemodata-1-IIE was designed and built for the wind velocity and direction data acquisition. The Anemodata-1-IIE is the result of the work that the Departamento de Fuentes no Convencionales (Non-Conventional Energy Sources of the Energy Sources Department) carries on regarding the development of electric equipment for the anemometry. [Espanol] Una fuente inagotable de energia es el viento. Estudiar su comportamiento para desarrollar proyectos de investigacion y aplicar nuevas tecnologias vinculadas con su maximo aprovechamiento es una de las actividades que se realizan en el Instituto de Investigaciones Electricas (IIE). Como parte de dichas actividades, se diseno y construyo el equipo Anemodata-1-IIE para la adquisicion de datos de velocidad y direccion del viento. El anemodata-1-IIE es un resultado de los trabajos que el Departamento de Fuentes no Convencionales, de la division de Fuentes de Energia, lleva a cabo en torno al desarrollo de equipo electrico para anemometria.

  2. A new aeolian generator for Mexico; Un nuevo generador eolico para Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Voronin, Boris; Gomez Reyna, Jose Antonio; Zerquera Izquierdo, Mariano David; Cardenas Grajales, Juan Jose; Zamora Quintana, Laura Angelica [Universidad de Guadalajara (Mexico)

    2009-07-01

    The use of wind kinetic energy to produce electrical energy is one of the most powerful alternatives for the human being, to avoid the risk of being in the threshold of the age of stone. In the present work, different types from aero generators are analyzed and a new generator developed by one of the authors of this article is presented. Its high efficiency is presented in comparison with the helical generators that at the moment are dominant in the construction of Aeolian mills. Perspectives of exploitation of the kinetic energy of the wind in Mexico are analyzed. A resolution model of the problem of obtaining constant parameters of electrical output, to conditions of variable mechanical parameters of entrance is shown. An example is shown of the construction of Aeolian parks that can cover all the needs of electrical energy in Mexico. [Spanish] El uso de la energia cinetica del viento para la obtencion de la energia electrica, es una de las alternativas mas poderosas para el ser humano, para evitar el riesgo de estar al umbral de la edad de piedra. En el trabajo presente, se analizan diferentes tipos de aerogeneradores y se presenta un nuevo generador desarrollado por uno de los autores de este articulo. Se muestra su alta eficiencia en comparacion con los generadores helicoidales que actualmente son dominantes en la construccion de molinos eolicos. Se analizan perspectivas de aprovechamiento de la energia cinetica del viento en Mexico. Se muestra un modelo de resolucion del problema de la obtencion de parametros de salida electricos constantes, a condiciones de los parametros mecanicos de entrada variables. Se muestra un ejemplo de la construccion de parques eolicos que pueden cubrir todas las necesidades de energia electrica en Mexico.

  3. [Children and motor competence].

    Science.gov (United States)

    Sigmundsson, H; Haga, M

    2000-10-20

    Recently, the topic of motor competence has figured prominently in the media. The claims made are many, but the research that support the statements is seldom cited. The aim of this review article is to address that deficiency by documenting what is really known about the motor competence of children. Motor competence not only allows children to carry out everyday practical tasks, but it is also an important determinant of their level of self-esteem and of their popularity and status in their peer group. While many studies have shown a significant correlation between motor problems and other problems in the social sphere, it has been difficult to establish causal relationships with any degree of confidence, as there appear to be several interactions which need to be taken into account. Research has shown that 6-10% of Norwegian children in the 7 to 10 year age group have a motor competence well below the norm. It is unusual for motor problems to simply disappear over time. In the absence of intervention the syndrome is likely to continue to manifest itself. More recent research points to some of the circularity in this causal network, children with motor problems having been shown to be less physically active than their peers. In a larger health perspective this in itself can have very serious consequences for the child.

  4. Application of Geographic Information Systems for Rural Electrification with Renewable Energy: IntiGIS Model. Case of Study: Zapara Island, Zulia State. Venezuela; Aplicaciones de Sistemas de Informacion Geografica para la Electrificacion Rural con Energias Renovables: Modelo IntiGIS. Caso de Estudio: Isla Zapara, Estado Zulia. Venezuela

    Energy Technology Data Exchange (ETDEWEB)

    Rincon, L; Dominguez, J; Amador, J; Arribas, L; Pinedo, I

    2011-07-01

    This project started as an educational exercise for the Renewable Energy and Environment Master, taught by the Polytechnic University of Madrid, with the purpose of analyze in a real context GIS application in rural electrification with renewable energies. It was developed in collaboration with CIEMAT, ENELVEN (C.A. Energia Electrica de Venezuela), FUNDELEC (Fundacion para el Desarrollo del Servicio Electrico), CORPOLEC (Corporacion Electrica Nacional de Venezuela) and the UPM. The final aim is to define the technology that suits best to Zapara Islands electrification needs. This improvement will make possible the sustainable development of the population. In order to compare electrification technologies to decide which is the most suitable to Zapara Island, using IntiGIS model, will be required a geographic resources analysis, a population distribution and an electricity demand study. Also, it will be necessary to establish the technical parameters of the facility and economic factors that could affect the study. (Author) 14 refs.

  5. Motor Vehicle Safety

    Science.gov (United States)

    ... these crashes is one part of motor vehicle safety. Here are some things you can do to ... speed or drive aggressively Don't drive impaired Safety also involves being aware of others. Share the ...

  6. Motor Carrier Crash Data -

    Data.gov (United States)

    Department of Transportation — Contains data on large trucks and buses involved in Federally reportable crashes as per Title 49 U.S.C. Part 390.5 (crashes involving a commercial motor vehicle, and...

  7. High Power Density Motors

    Science.gov (United States)

    Kascak, Daniel J.

    2004-01-01

    With the growing concerns of global warming, the need for pollution-free vehicles is ever increasing. Pollution-free flight is one of NASA's goals for the 21" Century. , One method of approaching that goal is hydrogen-fueled aircraft that use fuel cells or turbo- generators to develop electric power that can drive electric motors that turn the aircraft's propulsive fans or propellers. Hydrogen fuel would likely be carried as a liquid, stored in tanks at its boiling point of 20.5 K (-422.5 F). Conventional electric motors, however, are far too heavy (for a given horsepower) to use on aircraft. Fortunately the liquid hydrogen fuel can provide essentially free refrigeration that can be used to cool the windings of motors before the hydrogen is used for fuel. Either High Temperature Superconductors (HTS) or high purity metals such as copper or aluminum may be used in the motor windings. Superconductors have essentially zero electrical resistance to steady current. The electrical resistance of high purity aluminum or copper near liquid hydrogen temperature can be l/lOO* or less of the room temperature resistance. These conductors could provide higher motor efficiency than normal room-temperature motors achieve. But much more importantly, these conductors can carry ten to a hundred times more current than copper conductors do in normal motors operating at room temperature. This is a consequence of the low electrical resistance and of good heat transfer coefficients in boiling LH2. Thus the conductors can produce higher magnetic field strengths and consequently higher motor torque and power. Designs, analysis and actual cryogenic motor tests show that such cryogenic motors could produce three or more times as much power per unit weight as turbine engines can, whereas conventional motors produce only 1/5 as much power per weight as turbine engines. This summer work has been done with Litz wire to maximize the current density. The current is limited by the amount of heat it

  8. Split-phase motor running as capacitor starts motor and as capacitor run motor

    Directory of Open Access Journals (Sweden)

    Yahaya Asizehi ENESI

    2016-07-01

    Full Text Available In this paper, the input parameters of a single phase split-phase induction motor is taken to investigate and to study the output performance characteristics of capacitor start and capacitor run induction motor. The value of these input parameters are used in the design characteristics of capacitor run and capacitor start motor with each motor connected to rated or standard capacitor in series with auxiliary winding or starting winding respectively for the normal operational condition. The magnitude of capacitor that will develop maximum torque in capacitor start motor and capacitor run motor are investigated and determined by simulation. Each of these capacitors is connected to the auxiliary winding of split-phase motor thereby transforming it into capacitor start or capacitor run motor. The starting current and starting torque of the split-phase motor (SPM, capacitor run motor (CRM and capacitor star motor (CSM are compared for their suitability in their operational performance and applications.

  9. Design of a seismic energy dissipator for an interruptor type 3AS2-45; Diseno de un disipador de energia sismica para un interruptor tipo 3AS2-45

    Energy Technology Data Exchange (ETDEWEB)

    Castro Felix, Jaime

    2004-02-15

    With the aid of the theory behind seismically isolated structures and the bi-linear behavior of an isolated system of Multiple Degrees of Freedom (MDOF), the information obtained on the spectral analysis is complemented with the purpose of simulating one itself for the design of a dissipator of seismic energy. The seismicity in the world is briefly explained, (in Mexico in special for the Geothermal Field of Cerro Prieto), the types of earthquakes, etc., to give way to a documentation of the state-of-the-art in advanced seismic resistant systems and to a procedure to establish the level of seismic qualification of electrical equipment from the level of seismic performance for the Mexican Republic. [Spanish] Con la ayuda de la teoria detras de estructuras aisladas sismicamente y el comportamiento bilineal de un sistema de aislamiento de Multiples Grados de Libertad (MDOF), se complementa la informacion recabada sobre el analisis espectral con el fin de simular uno propio para el diseno de un disipador de energia sismica. Se explica brevemente la sismicidad en el mundo, en Mexico, en especial el Campo Geotermico de Cerro Prieto, los tipos de sismos, etc., para dar paso a una documentacion del estado del arte en sistemas sismorresistentes avanzados y a un procedimiento para establecer el nivel de calificacion sismica de equipos electricos a partir del Nivel de desempeno sismico para la Republica Mexicana.

  10. Electrodynamic linear motor

    Energy Technology Data Exchange (ETDEWEB)

    Munehiro, H

    1980-05-29

    When driving the carriage of a printer through a rotating motor, there are problems regarding the limited accuracy of the carriage position due to rotation or contraction and ageing of the cable. In order to solve the problem, a direct drive system was proposed, in which the printer carriage is driven by a linear motor. If one wants to keep the motor circuit of such a motor compact, then the magnetic flux density in the air gap must be reduced or the motor travel must be reduced. It is the purpose of this invention to create an electrodynamic linear motor, which on the one hand is compact and light and on the other hand has a relatively high constant force over a large travel. The invention is characterised by the fact that magnetic fields of alternating polarity are generated at equal intervals in the magnetic field, and that the coil arrangement has 2 adjacent coils, whose size corresponds to half the length of each magnetic pole. A logic circuit is provided to select one of the two coils and to determine the direction of the current depending on the signals of a magnetic field sensor on the coil arrangement.

  11. Robot Saltador y Procedimiento para su Control

    OpenAIRE

    Akinfiev, Teodor; Armada, Manuel; Fernández, Roemi; Montes, Héctor

    2005-01-01

    Robot saltador para el movimiento en terrenos con obstáculos, que contiene al menos un resorte (4) con uno de sus extremos unido al cuerpo (1) del robot, y una cadena cinemática entre el motor (5) y el resorte (4) que comprende un cilindro (7) conectado con el eje del motor (5) y una cuerda (8), con uno de sus extremos conectado al cilindro (7) y con el segundo extremo conectado al pie (3). El procedimiento de control se caracteriza porque en el momento en el que el pie (3) pierde el contacto...

  12. Tratamiento catalítico de las emisiones de NOx en motores diesel

    OpenAIRE

    Córdoba, Luis Fernando; Montes de Correa, Consuelo

    2002-01-01

    Se presenta una revisión sobre algunos aspectos del funcionamiento de los motores diesel, las emisiones contaminantes producidas, así como las tecnologías catalíticas disponibles para el tratamiento de dichas emisiones. Se introduce además, el desempeño de un catalizador desarrollado en el grupo Catálisis Ambiental para la reducción de NOx en mezclas sintéticas que simulan las emisiones de motores diesel. Palabras clave: motor diesel, emisiones, tratamiento, catalizadores.

  13. Contribución al modelado unidimensional en motores de dos tiempos de altas prestaciones

    OpenAIRE

    JIMENEZ MACEDO, VICTOR DANIEL

    2013-01-01

    Un modelo de simulación presenta muchas ventajas en el campo del desarrollo de motores de combustión interna alternativos. Su utilidad es doble. Por un lado, para entender la naturaleza de los fenómenos físicos que suceden en el interior del motor, y por otro, con el fin de optimizar el diseño de los sistemas que integran el mismo. El principal objetivo de esta tesis es desarrollar un modelo de un motor de dos tiempos de 125 cc de altas prestaciones para caracterizar la fluidodinámica interna...

  14. Markov process of muscle motors

    International Nuclear Information System (INIS)

    Kondratiev, Yu; Pechersky, E; Pirogov, S

    2008-01-01

    We study a Markov random process describing muscle molecular motor behaviour. Every motor is either bound up with a thin filament or unbound. In the bound state the motor creates a force proportional to its displacement from the neutral position. In both states the motor spends an exponential time depending on the state. The thin filament moves at a velocity proportional to the average of all displacements of all motors. We assume that the time which a motor stays in the bound state does not depend on its displacement. Then one can find an exact solution of a nonlinear equation appearing in the limit of an infinite number of motors

  15. Electric vehicle motors and controllers

    Science.gov (United States)

    Secunde, R. R.

    1981-01-01

    Improved and advanced components being developed include electronically commutated permanent magnet motors of both drum and disk configuration, an unconventional brush commutated motor, and ac induction motors and various controllers. Test results on developmental motors, controllers, and combinations thereof indicate that efficiencies of 90% and higher for individual components, and 80% to 90% for motor/controller combinations can be obtained at rated power. The simplicity of the developmental motors and the potential for ultimately low cost electronics indicate that one or more of these approaches to electric vehicle propulsion may eventually displace presently used controllers and brush commutated dc motors.

  16. Motor development of kindergarten in 13 months interval

    Directory of Open Access Journals (Sweden)

    Lilian Teresa Bucken Gobbi

    2005-12-01

    da Escala de Desenvolvimento Motor, que compreende uma bateria de testes envolvendo tarefas específicas por idade nos itens motricidade fina, motricidade global, equilíbrio, esquema corporal/rapidez e organização espacial. Foram realizadas comparações do desempenho motor intra e entre os grupos, para cada item da bateria. Os resultados mostraram que o desempenho motor nas tarefas de equilíbrio melhorou após 13 meses para todos os grupos etários; para motricidade fina, motricidade global e esquema corporal as crianças de 3, 4 e 5 anos melhoraram seu desempenho entre as avaliações; para organização espacial somente as crianças de 3 e 5 anos melhoraram seu desempenho quando re-avaliadas. Estes resultados sugerem que o desenvolvimento nesta faixa etária ocorre de forma não homogênea, ou seja, apresenta ritmos diferentes para os itens da motricidade. Fatores do ambiente, do indivíduo e da tarefa podem explicar as mudanças desenvolvimentistas ocorridas em um período de 13 meses. Conclui-se que o processo de desenvolvimento de cada componente da motricidade é dinâmico e apresenta aspectos de não linearidade.

  17. A versatile stepping motor controller for systems with many motors

    International Nuclear Information System (INIS)

    Feng, S.K.; Siddons, D.P.

    1989-01-01

    A versatile system for controlling beamlines or complex experimental setups is described. The system as currently configured can control up to 32 motors, with all motors capable of full speed operation concurrently. There are 2 limit switch inputs for each motor, and a further input to accept a reference position marker. The motors can be controlled via a front panel keyboard with display, or by a host computer over an IEEE-488 interface. Both methods can be used together if required. There is an ''emergency stop'' key on the front panel keyboard to stop the motion of all motors without losing track of the motors' position. 3 refs., 4 figs., 1 tab

  18. Technological evolution of the fluorescent lamps for the domestic sector; Evolucion tecnologica de lamparas fluorescentes para el sector domestico

    Energy Technology Data Exchange (ETDEWEB)

    Valera Negrete, A. [Programa de Ahorro de Energia para el Sector Electrico, Mexico, D. F. (Mexico)

    1995-12-31

    This paper shows the efficiency, the harmonic distortion and the power factor of compact and circular fluorescent lamps that replace the incandescent bulbs of 60, 75 and 100 Watts in the domestic sector offered by manufacturers to increase the efficient use of the electric energy in networks of the national electric system. Also are presented, the quality parameters such as color temperature, performance index, useful life and maintenance of the lighting source; the aesthetics as length and weight and additionally the safety measures (thermal protector) that make competitive and functional the use of fluorescent lamps in relation to the installation of incandescent bulbs. [Espanol] En este trabajo se muestran las eficacias, distorsion de armonica y factor de potencia de lamparas fluorescentes compactas y circulares, que sustituyen a focos incandescentes de 60, 75 y 100 W en el sector domestico, ofrecidas por los fabricantes para aumentar el uso eficiente de la energia electrica en las redes del sistema electrico nacional. Ademas, se presentan los parametros de calidad, como temperatura de color, indice de rendimiento de color, vida y mantenimiento de la fuente luminosa; de estetica como longitud y peso; y adicionalmente la medida de seguridad (protector termico); que hace competitivo y funcional el uso de lamparas fluorescentes respecto a la instalacion de focos incandescentes.

  19. Technological evolution of the fluorescent lamps for the domestic sector; Evolucion tecnologica de lamparas fluorescentes para el sector domestico

    Energy Technology Data Exchange (ETDEWEB)

    Valera Negrete, A [Programa de Ahorro de Energia para el Sector Electrico, Mexico, D. F. (Mexico)

    1996-12-31

    This paper shows the efficiency, the harmonic distortion and the power factor of compact and circular fluorescent lamps that replace the incandescent bulbs of 60, 75 and 100 Watts in the domestic sector offered by manufacturers to increase the efficient use of the electric energy in networks of the national electric system. Also are presented, the quality parameters such as color temperature, performance index, useful life and maintenance of the lighting source; the aesthetics as length and weight and additionally the safety measures (thermal protector) that make competitive and functional the use of fluorescent lamps in relation to the installation of incandescent bulbs. [Espanol] En este trabajo se muestran las eficacias, distorsion de armonica y factor de potencia de lamparas fluorescentes compactas y circulares, que sustituyen a focos incandescentes de 60, 75 y 100 W en el sector domestico, ofrecidas por los fabricantes para aumentar el uso eficiente de la energia electrica en las redes del sistema electrico nacional. Ademas, se presentan los parametros de calidad, como temperatura de color, indice de rendimiento de color, vida y mantenimiento de la fuente luminosa; de estetica como longitud y peso; y adicionalmente la medida de seguridad (protector termico); que hace competitivo y funcional el uso de lamparas fluorescentes respecto a la instalacion de focos incandescentes.

  20. Flood-proof motors

    Energy Technology Data Exchange (ETDEWEB)

    Schmitt, Marcus [AREVA NP GmbH, Erlangen (Germany)

    2013-07-01

    Even before the Fukushima event occurred some German nuclear power plants (NPP) have considered flooding scenarios. As a result of one of these studies, AREVA performed an upgrade project in NPP Isar 1 with flood-proof motors as a replacement of existing air-cooled low-voltage and high-voltage motors of the emergency cooling chain. After the Fukushima event, in which the cooling chains failed, the topic flood-proof equipment gets more and more into focus. This compact will introduce different kinds of flood-proof electrical motors which are currently installed or planned for installation into NPPs over the world. Moreover the process of qualification, as it was performed during the project in NPP Isar 1, will be shown. (orig.)

  1. Advanced AC Motor Control

    Energy Technology Data Exchange (ETDEWEB)

    Kazmierkowski, M.P. [Institute of Control and Industrial Electronics, Warsaw University of Technology, Warszawa (Poland)

    1997-12-31

    In this paper a review of control methods for high performance PWM inverter-fed induction motor drives is presented. Starting from the description of an induction motor by the help of the space vectors, three basic control strategic are discussed. As first, the most popular Field Oriented Control (FOC) is described. Secondly, the Direct Torque and Flux vector Control (DTFC) method, which - in contrast to FOC - depart from idea of coordinate transformation and analogy with DC motor, is briefly characterized. The last group is based on Feedback Linearization Control (FLC) and can be easy combined with sliding mode control. The simulation and experimental oscillograms that illustrate the performance of the discussed control strategies are shown. (orig.) 35 refs.

  2. Flood-proof motors

    International Nuclear Information System (INIS)

    Schmitt, Marcus

    2013-01-01

    Even before the Fukushima event occurred some German nuclear power plants (NPP) have considered flooding scenarios. As a result of one of these studies, AREVA performed an upgrade project in NPP Isar 1 with flood-proof motors as a replacement of existing air-cooled low-voltage and high-voltage motors of the emergency cooling chain. After the Fukushima event, in which the cooling chains failed, the topic flood-proof equipment gets more and more into focus. This compact will introduce different kinds of flood-proof electrical motors which are currently installed or planned for installation into NPPs over the world. Moreover the process of qualification, as it was performed during the project in NPP Isar 1, will be shown. (orig.)

  3. Technical and economical assessment of the options for energy saving in the library of the Universidad Autonoma Metropolitana-Azcapotzalco; Evaluacion tecnico economica de opciones para el ahorro de energia en la biblioteca de la Universidad Autonoma Metropolitana-Azcapotzalco

    Energy Technology Data Exchange (ETDEWEB)

    Bratu, N; Campero, E; Dorantes, R; Fuentes, V; Figueroa, A; Garcia, R; Zekkour, A [Universidad Autonoma Metropolitana-Azcapotzalco, Mexico, D. F. (Mexico)

    1994-12-31

    This paper presents a diagnosis of the electrical energy consumption in the library of the Azcapotzalco Unit of the Universidad Autonoma Metropolitana, to determine the actions that can be implemented for energy conservation. This without disturbing the lighting and thermal comfort. The analysis showed that, by changing the reflecting surfaces of the lighting lamps, the number of units can be reduced, without lowering the illumination level below the recommended values. The saving was estimated for replacement of the fluorescent lamps for others of metallic halogenides in the areas where the ceiling is high; for the installation of switches to improve the selectivity in turning on and turning off the lamps, achieving this way a better usage of the natural light; for the reduction of the electric load of the air conditioning units which will be obtained in incorporating induced draft shafts; and for an improvement in the electric and ballast installation. For the actions that turned out to be redeemable in three years the assistance of the Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE) of the Comision Federal de Electricidad (CFE) has been available. It is expected that the execution of the modifications will be carried out in the November and December months of 1993, and the results will be evaluated in 1994. [Espanol] En este trabajo se presenta un diagnostico del consumo de energia electrica en la biblioteca de la Unidad Azcapotzalco de la Universidad Autonoma Metropolitana para determinar las acciones que se pueden llevar a cabo para ahorrar energia electrica. Esto sin deteriorar el confort luminico y termico. El analisis mostro que, cambiando las superficies reflectoras de las luminarias, se puede reducir el numero de lamparas, sin que el nivel de iluminacion quede debajo de los valores recomendados. Se estimaron ahorros: por la sustitucion de las lamparas fluorescentes por otras de halogenuros metalicos en las partes donde el

  4. Technical and economical assessment of the options for energy saving in the library of the Universidad Autonoma Metropolitana-Azcapotzalco; Evaluacion tecnico economica de opciones para el ahorro de energia en la biblioteca de la Universidad Autonoma Metropolitana-Azcapotzalco

    Energy Technology Data Exchange (ETDEWEB)

    Bratu, N.; Campero, E.; Dorantes, R.; Fuentes, V.; Figueroa, A.; Garcia, R.; Zekkour, A. [Universidad Autonoma Metropolitana-Azcapotzalco, Mexico, D. F. (Mexico)

    1993-12-31

    This paper presents a diagnosis of the electrical energy consumption in the library of the Azcapotzalco Unit of the Universidad Autonoma Metropolitana, to determine the actions that can be implemented for energy conservation. This without disturbing the lighting and thermal comfort. The analysis showed that, by changing the reflecting surfaces of the lighting lamps, the number of units can be reduced, without lowering the illumination level below the recommended values. The saving was estimated for replacement of the fluorescent lamps for others of metallic halogenides in the areas where the ceiling is high; for the installation of switches to improve the selectivity in turning on and turning off the lamps, achieving this way a better usage of the natural light; for the reduction of the electric load of the air conditioning units which will be obtained in incorporating induced draft shafts; and for an improvement in the electric and ballast installation. For the actions that turned out to be redeemable in three years the assistance of the Fideicomiso de Apoyo al Programa de Ahorro de Energia del Sector Electrico (FIDE) of the Comision Federal de Electricidad (CFE) has been available. It is expected that the execution of the modifications will be carried out in the November and December months of 1993, and the results will be evaluated in 1994. [Espanol] En este trabajo se presenta un diagnostico del consumo de energia electrica en la biblioteca de la Unidad Azcapotzalco de la Universidad Autonoma Metropolitana para determinar las acciones que se pueden llevar a cabo para ahorrar energia electrica. Esto sin deteriorar el confort luminico y termico. El analisis mostro que, cambiando las superficies reflectoras de las luminarias, se puede reducir el numero de lamparas, sin que el nivel de iluminacion quede debajo de los valores recomendados. Se estimaron ahorros: por la sustitucion de las lamparas fluorescentes por otras de halogenuros metalicos en las partes donde el

  5. Mechanical design of electric motors

    CERN Document Server

    Tong, Wei

    2014-01-01

    Rapid increases in energy consumption and emphasis on environmental protection have posed challenges for the motor industry, as has the design and manufacture of highly efficient, reliable, cost-effective, energy-saving, quiet, precisely controlled, and long-lasting electric motors.Suitable for motor designers, engineers, and manufacturers, as well as maintenance personnel, undergraduate and graduate students, and academic researchers, Mechanical Design of Electric Motors provides in-depth knowledge of state-of-the-art design methods and developments of electric motors. From motor classificati

  6. Transformers and motors

    CERN Document Server

    Shultz, George

    1991-01-01

    Transformers and Motors is an in-depth technical reference which was originally written for the National Joint Apprenticeship Training Committee to train apprentice and journeymen electricians. This book provides detailed information for equipment installation and covers equipment maintenance and repair. The book also includes troubleshooting and replacement guidelines, and it contains a minimum of theory and math.In this easy-to-understand, practical sourcebook, you'll discover:* Explanations of the fundamental concepts of transformers and motors* Transformer connections and d

  7. Linear induction motor

    International Nuclear Information System (INIS)

    Barkman, W.E.; Adams, W.Q.; Berrier, B.R.

    1978-01-01

    A linear induction motor has been operated on a test bed with a feedback pulse resolution of 5 nm (0.2 μin). Slewing tests with this slide drive have shown positioning errors less than or equal to 33 nm (1.3 μin) at feedrates between 0 and 25.4 mm/min (0-1 ipm). A 0.86-m (34-in)-stroke linear motor is being investigated, using the SPACO machine as a test bed. Initial results were encouraging, and work is continuing to optimize the servosystem compensation

  8. Human spinal motor control

    DEFF Research Database (Denmark)

    Nielsen, Jens Bo

    2016-01-01

    Human studies in the past three decades have provided us with an emerging understanding of how cortical and spinal networks collaborate to ensure the vast repertoire of human behaviors. We differ from other animals in having direct cortical connections to spinal motoneurons, which bypass spinal...... the central motor command by opening or closing sensory feedback pathways. In the future, human studies of spinal motor control, in close collaboration with animal studies on the molecular biology of the spinal cord, will continue to document the neural basis for human behavior. Expected final online...

  9. Electrodynamic ratchet motor.

    Science.gov (United States)

    Lim, Jiufu; Sader, John E; Mulvaney, Paul

    2009-03-01

    Brownian ratchets produce directed motion through rectification of thermal fluctuations and have been used for separation processes and colloidal transport. We propose a flashing ratchet motor that enables the transduction of electrical energy into rotary micromechanical work. This is achieved through torque generation provided by boundary shaping of equipotential surfaces. The present device contrasts to previous implementations that focus on translational motion. Stochastic simulations elucidate the performance characteristics of this device as a function of its geometry. Miniaturization to nanoscale dimensions yields rotational speeds in excess of 1 kHz, which is comparable to biomolecular motors of similar size.

  10. The effect of induction motor shaft diameter on motor performance

    Directory of Open Access Journals (Sweden)

    Asım Gökhan Yetgin

    2017-10-01

    Full Text Available Induction motors are used in many areas from the past to the present and in different fields with the development of technology has continued to be used. It is obvious that induction motors as an improvement to the efficiency in terms of energy saving would cause great benefit. In that context, induction motor manufacturers and designers are constantly trying out new methods to improve motor performance and efficiency. In this study, what would be the optimum diameter of the shaft in order to increase the efficiency of the induction motor were investigated. In the study, 5.5 kW, 7.5 kW and 11 kW motors analyzes were also performed. Obtained shaft diameter values were compared with the manufacturer values. In addition, critical points such as the magnetic flux values, weight values and performances of the motors were examined and optimal shaft diameter values for each motor have been determined.

  11. Interfaz cerebro computador basada en P300 para la comunicación alternativa: estudio de caso en dos adolescentes en situación de discapacidad motora [P300 based Brain Computer Interface for alternative communication: a case study with two teenagers with motor disabilities

    NARCIS (Netherlands)

    Garcia Cossio, E.; Fernandez, C.; Gaviria, M.E.; Palacio, C.; Alvaran, L.; Torres Villa, R.A.

    2011-01-01

    Brain computer interface systems use brain signals to enable the control of external devices, such as: wheelchairs, communicators, neuro-prosthesis, among others; in people with severe motor disabilities. In this study two young men with motor disabilities were trained to learn how to control a

  12. para palmito

    Directory of Open Access Journals (Sweden)

    Francisco Paulo Chaimsohn

    2007-01-01

    Full Text Available Densidades de siembra, arreglos espaciales y fertilización en pejibaye (Bactris gasipaes cv Diamantes-10 para palmito. La investigación se llevó a cabo en la Estación Experimental Los Diamantes (Guápiles, Costa Rica, el 3 de octubre del 2003, cuyo objetivo fue la evaluación del efecto de diferentes densidades de siembra (3.333, 5.000 y 6.666 plantas/ha, arreglos espaciales, y diversos métodos de fertilización (química, orgánica, sobre el crecimiento de las plantas de pejibaye para producción de palmito. Se consideraron las variables diámetro y altura del tallo primario y el número de hojas y rebrotes como indicadores de producción. El período de evolución abarcó sólo los primeros 25 meses de crecimiento en el campo. El número de hojas, la altura y el diámetro del tallo no mostraron diferencias de respuesta relevantes. Sólo el número de rebrotes disminuyó al aumentar la densidad de la población, cuando se midió a los 15 meses de edad. El efecto de la fertilización se hizo evidente después de la primera cosecha, realizada a los 20 meses, debido al aumento de la competencia entre plantas, ahora más desarrolladas. Fue entonces cuando la fertilización química indujo la producción de un mayor número y vigor de los rebrotes. Sin embargo, las prácticas evaluadas 25 meses después de la siembra, no habían infl uido hasta ese momento en el número de palmitos cosechados, ni tampoco había afectado las características físicas de los sectores foliar y caulinar del palmito.

  13. HTSL massive motor. Project: Motor field calculation. Final report

    International Nuclear Information System (INIS)

    Gutt, H.J.; Gruener, A.

    2003-01-01

    HTS motors up to 300 kW were to be developed and optimized. For this, specific calculation methods were enhanced to include superconducting rotor types (hysteresis, reluctance and permanent magnet HTS rotors). The experiments were carried out in a SHM70-45 hysteresis motor. It was shown how static and dynamic trapped field magnetisation of the rotor with YBCO rings will increase flux in the air gap motor, increasing the motor capacity to twice its original level. (orig.) [de

  14. Technological tendencies for the improvement of the performance of combined cycle power stations; Tendencias tecnologicas para el mejoramiento del desempeno de centrales de cilco combinado

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez P, Marino; Garduno R, Raul; Chavez T, Rafael [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2001-07-01

    In this article are dealt some the aspects that have turned the combined cycle generating power stations (CCGPS) into the dominant way for the electrical generation in the world. In the first part it is presented the plan of expansion of the national electrical generation and similar information that the U.S.A. has for the CCGPS, which will give an idea of the importance and the impact that has this technology at the moment. The basic characteristics that are necessary to specify in order to satisfy the environmental and operation requirements, and the available technologies to increase the global efficiency of the CCGPS are also exposed. Finally it describes the evolution of the technology of control for CCGPS developed in the Gerencia de Control e Instrumentacion (GCI), as well as the capacities available to support the electrical sector in this technological discipline. [Spanish] En este articulo se tratan algunos de los aspectos que han convertido a las centrales de generacion de ciclo combinado (CGCC) en el modo dominante para la generacion electrica en el mundo. En la primera parte se presenta el plan de expansion de la generacion electrica nacional e informacion similar que los EE.UU. tienen para las CGCC, lo que dara una idea de la importancia y del impacto que tiene actualmente esta tecnologia. Se exponen tambien las caracteristicas principales que es necesario especificar a fin de satisfacer los requerimientos ambientales y de operacion, y las tecnologias disponibles para incrementar la eficiencia global de las CGCC. Finalmente se describe la evolucion de la tecnologia de control para CGCC desarrollada en la Gerencia de Control e Instrumentacion (GCI), asi como las capacidades disponibles para apoyar al sector electrico en esta disciplina tecnologica.

  15. Stepping Motor - Hydraulic Motor Servo Drives for an NC Milling ...

    African Journals Online (AJOL)

    In this paper the retrofit design of the control system of an NC milling machine with a stepping motor and stepping motor - actuated hydraulic motor servo mechanism on the machines X-axis is described. The servo designed in the course of this study was tested practically and shown to be linear - the velocity following errors ...

  16. Thiokol Solid Rocket Motors

    Science.gov (United States)

    Graves, S. R.

    2000-01-01

    This paper presents viewgraphs on thiokol solid rocket motors. The topics include: 1) Communications; 2) Military and government intelligence; 3) Positioning satellites; 4) Remote sensing; 5) Space burial; 6) Science; 7) Space manufacturing; 8) Advertising; 9) Space rescue space debris management; 10) Space tourism; 11) Space settlements; 12) Hazardous waste disposal; 13) Extraterrestrial resources; 14) Fast package delivery; and 15) Space utilities.

  17. Reciprocating Linear Electric Motor

    Science.gov (United States)

    Goldowsky, M. P.

    1984-01-01

    Features include structural simplicity and good force/displacement characteristics. Reciprocating motor has simple, rugged construction, relatively low reciprocating weight, improved power delivery, and improved force control. Wear reduced by use of magnetic bearings. Intended to provide drivers for long-lived Stirling-cycle cryogenic refrigerators, concept has less exotic applications, such as fuel pumps.

  18. Switched reluctance motor drives

    Indian Academy of Sciences (India)

    Davis RM, Ray WF, Blake RJ 1981 Inverter drive for switched reluctance: circuits and component ratings. Inst. Elec. Eng. Proc. B128: 126-136. Ehsani M. 1991 Position Sensor elimination technique for the switched reluctance motor drive. US Patent No. 5,072,166. Ehsani M, Ramani K R 1993 Direct control strategies based ...

  19. Motor Incoordination in ADHD

    Directory of Open Access Journals (Sweden)

    J Gordon Millichap

    2004-07-01

    Full Text Available The relationship between motor performance, attention deficit, impulsiveness, and hyperactivity in 42 school-aged children with ADHD (36 males, 6 females; mean age 8 years 2 months; range 6-11 years was studied at National Taiwan University, Taipei, Taiwan.

  20. Deafness and motor abilities level

    Directory of Open Access Journals (Sweden)

    A Zwierzchowska

    2008-09-01

    Full Text Available The audition injury hinders some motor motions and the organised coordination at the higher level and may be a cause of disturbances and disorder in some motor abilities adoption. It was assumed that deafness including its aetiology and injury mechanism may significantly influence the motor development of human being. The study aimed in checking if the deafness, as a result of various unfavourable factors, determines the motor development of children and youngsters. Consequently the dependency between qualitative features i.e.: signed motor level and aetiology, audition injury mechanism and the deafness degree was examined. The mechanism and aetiology of hearing correlated with the motor abilities displayed statistically significant dependencies in few motor trials only. Revealed correlations regarded mostly the coordination trials excluding the flexibility one. Statistically significant dependencies between the audition diminution and the motor abilities level were not found.

  1. MOTORIC STIMULATION RELATED TO FINE MOTORIC DEVELOPMENT ON CHILD

    Directory of Open Access Journals (Sweden)

    Mira Triharini

    2017-07-01

    Full Text Available Introduction: Motor developmental stimulation is an activity undertaken to stimulate the children basic skills and so they can grow and develop optimally. Children who obtain a direct stimulus will grow faster than who get less stimulus. Mother’s behavior of stimulation is very important for children, it is considering as the basic needs of children and it must be fulfilled. Providing good stimulation could optimize fine motor development in children. The purpose of this study was to analyze mother’s behavior about motor stimulation with fine motor development in toddler age 4-5 years old. Method: Design have been  used in this study was cross sectional. Population were mothers and their toddler in Group A of Dharma Wanita Persatuan Driyorejo Gresik Preschool. Sample were 51 respondents recruited by using purposive sampling technique according to inclusion and exclusion criteria. The independent variable was mother’s behavior about motor stimulation whereas dependent variable was fine motor development in toddler. The data were collected using questionnaire and conducting observation on fine motor development based on Denver Development Screening Test (DDST. Data then analyzed using Spearman Rho (r test to find relation between mother’s behaviors about stimulation motor on their toddler fine motor development. Result: Results  of this study showed that there were correlations between mother’s knowledge and fine motor development in toddler (p=0.000, between mother’s attitude and fine motor development in toddler (p=0.000, and between mother’s actions and fine motor development in toddler (p=0.000. Analysis: In sort study found that there were relation between fine motor development and mother’s behavior. Discussion: Therefore mother’s behavior needed to be improved. Further research about stimulation motor and fine motor development aspects in toddler is required.

  2. Desarrollo de un videojuego para dispositivos móviles

    OpenAIRE

    Ruiz Pérez, Francisco

    2016-01-01

    Los dispositivos móviles se han convertido en una de las principales plataformas para videojuegos. Una de las principales problemáticas al desarrollar aplicaciones para estos dispositivos es la alta fragmentación que existe en cuanto a sistemas operativos y características de la interfaz. Existen determinadas librerías y motores, tanto nativas como multiplataforma, dirigidas a resolver este problema.

  3. Microprocessor controller for stepping motors

    International Nuclear Information System (INIS)

    Strait, B.G.; Thuot, M.E.

    1977-01-01

    A new concept for digital computer control of multiple stepping motors which operate in a severe electromagnetic pulse environment is presented. The motors position mirrors in the beam-alignment system of a 100-kJ CO 2 laser. An asynchronous communications channel of a computer is used to send coded messages, containing the motor address and stepping-command information, to the stepping-motor controller in a bit serial format over a fiber-optics communications link. The addressed controller responds by transmitting to the computer its address and other motor information, thus confirming the received message. Each controller is capable of controlling three stepping motors. The controller contains the fiber-optics interface, a microprocessor, and the stepping-motor driven circuits. The microprocessor program, which resides in an EPROM, decodes the received messages, transmits responses, performs the stepping-motor sequence logic, maintains motor-position information, and monitors the motor's reference switch. For multiple stepping-motor application, the controllers are connected in a daisy chain providing control of many motors from one asynchronous communications channel of the computer

  4. Multiple stage miniature stepping motor

    International Nuclear Information System (INIS)

    Niven, W.A.; Shikany, S.D.; Shira, M.L.

    1981-01-01

    A stepping motor comprising a plurality of stages which may be selectively activated to effect stepping movement of the motor, and which are mounted along a common rotor shaft to achieve considerable reduction in motor size and minimum diameter, whereby sequential activation of the stages results in successive rotor steps with direction being determined by the particular activating sequence followed

  5. Experiments with a DC Motor

    Science.gov (United States)

    Kraftmakher, Yaakov

    2010-01-01

    Experiments with an electric motor provide good opportunity to demonstrate some basic laws of electricity and magnetism. The aim of the experiments with a low-power dc motor is to show how the motor approaches its steady rotation and how its torque, mechanical power and efficiency depend on the rotation velocity. The tight relationship between the…

  6. Fundamental Principles underlying Motor Reflexes

    NARCIS (Netherlands)

    K. Zhou (Kuikui)

    2017-01-01

    markdownabstractThe cerebellum has been suggested to be involved in motor control ever since the early 19th century. The motor control ranges from timing and strength of simple reflexes to multiple joint/limb coordination and complex motor sequence acquisition. The current thesis discusses the

  7. Motor Vehicle Theft. Special Report.

    Science.gov (United States)

    Harlow, Caroline Wolf

    Thirteen years of data from the National Crime Survey were analyzed to examine the characteristics of motor vehicle theft, to identify trends during the past 13 years, and to determine who are most likely to be victims of motor vehicle theft. All motor vehicle thefts reported to the National Crime Survey from 1973 through 1985 were examined.…

  8. Segmented motor drive - with multi-phase induction motor

    DEFF Research Database (Denmark)

    Bendixen, Flemming Buus

    of the induction motor is set up. The model is able to calculate dynamical electric, magnetic and mechanic state variables, but initially it is used to calculate static characteristics in motors with different number of phases and different voltage supply shapes. This analysis show i.e. that the efficiency....... The multi-phase motor is selected for further analysis. The project is limited to examine if increasing the number of phases can improve the characteristics for induction motor drives. In the literature it is demonstrated that torque production in a six-phase motor can be increased, if a 3rd harmonic......This PhD project commences in modulation of motor drives, i.e. having the advantage of reducing the number of variants and improves the system reliability at error situations. Four different motor drive topologies with modular construction as common denominator are compared on a general level...

  9. Variation in motor output and motor performance in a centrally generated motor pattern

    Science.gov (United States)

    Norris, Brian J.; Doloc-Mihu, Anca; Calabrese, Ronald L.

    2014-01-01

    Central pattern generators (CPGs) produce motor patterns that ultimately drive motor outputs. We studied how functional motor performance is achieved, specifically, whether the variation seen in motor patterns is reflected in motor performance and whether fictive motor patterns differ from those in vivo. We used the leech heartbeat system in which a bilaterally symmetrical CPG coordinates segmental heart motor neurons and two segmented heart tubes into two mutually exclusive coordination modes: rear-to-front peristaltic on one side and nearly synchronous on the other, with regular side-to-side switches. We assessed individual variability of the motor pattern and the beat pattern in vivo. To quantify the beat pattern we imaged intact adults. To quantify the phase relations between motor neurons and heart constrictions we recorded extracellularly from two heart motor neurons and movement from the corresponding heart segments in minimally dissected leeches. Variation in the motor pattern was reflected in motor performance only in the peristaltic mode, where larger intersegmental phase differences in the motor neurons resulted in larger phase differences between heart constrictions. Fictive motor patterns differed from those in vivo only in the synchronous mode, where intersegmental phase differences in vivo had a larger front-to-rear bias and were more constrained. Additionally, load-influenced constriction timing might explain the amplification of the phase differences between heart segments in the peristaltic mode and the higher variability in motor output due to body shape assumed in this soft-bodied animal. The motor pattern determines the beat pattern, peristaltic or synchronous, but heart mechanics influence the phase relations achieved. PMID:24717348

  10. Split-phase motor running as capacitor starts motor and as capacitor run motor

    OpenAIRE

    Yahaya Asizehi ENESI; Jacob TSADO; Mark NWOHU; Usman Abraham USMAN; Odu Ayo IMORU

    2016-01-01

    In this paper, the input parameters of a single phase split-phase induction motor is taken to investigate and to study the output performance characteristics of capacitor start and capacitor run induction motor. The value of these input parameters are used in the design characteristics of capacitor run and capacitor start motor with each motor connected to rated or standard capacitor in series with auxiliary winding or starting winding respectively for the normal operational condition. The ma...

  11. Acute exercise improves motor memory

    DEFF Research Database (Denmark)

    Skriver, Kasper Christen; Roig, Marc; Lundbye-Jensen, Jesper

    2014-01-01

    We have recently shown that a single bout of acute cardiovascular exercise improves motor skill learning through an optimization of long-term motor memory. Here we expand this previous finding, to explore potential exercise-related biomarkers and their association with measures of motor memory...... practice whereas lactate correlated with better retention 1 hour as well as 24 hours and 7 days after practice. Thus, improvements in motor skill acquisition and retention induced by acute cardiovascular exercise are associated with increased concentrations of biomarkers involved in memory and learning...... processes. More mechanistic studies are required to elucidate the specific role of each biomarker in the formation of motor memory....

  12. Control of Position for a Telescope with Stepping Motors

    OpenAIRE

    Quintero Salazar, Edwin Andrés; Gallego Becerra, Hugo Armando; Gallego Orozco, Hoover

    2008-01-01

    En este documento se muestran los resultados obtenidos al construir un control electrónico de posición para un telescopio reflector de 15 cm de objetivo, con motores paso a paso manejados desde un microcontrolador. También se ilustra el diseño circuital realizado, la simulación obtenida en la herramienta informática Proteus, el software desarrollado en lenguaje ensamblador para el microcontrolador, y el circuito final resultante montado sobre protoboard. In this paper the obtained resul...

  13. Dynamically Timed Electric Motor

    Science.gov (United States)

    Casper, Ann M. (Inventor)

    1997-01-01

    A brushless DC motor including a housing having an end cap secured thereto. The housing encloses a rotor. a stator and a rotationally displaceable commutation board having sensors secured thereon and spaced around the periphery of the rotor. An external rotational force is applied to the commutation board for displacement of the sensors to various positions whereby varying feedback signals are generated by the positioning of the sensors relative to the rotating rotor. The commutation board is secured in a fixed position in response to feedback signals indicative of optimum sensor position being determined. The rotation of the commutation board and the securing of the sensors in the desired fixed position is accomplished without requiring the removal of the end cap and with the DC motor operating.

  14. TFTR Motor Generator

    International Nuclear Information System (INIS)

    Murray, J.G.; Bronner, G.; Horton, M.

    1977-01-01

    A general description is given of 475 MVA pulsed motor generators for TFTR at Princeton Plasma Physics Laboratory. Two identical generators operating in parallel are capable of supplying 950 MVA for an equivalent square pulse of 6.77 seconds and 4,500 MJ at 0.7 power factor to provide the energy for the pulsed electrical coils and heating system for TFTR. The description includes the operational features of the 15,000 HP wound rotor motors driving each generator with its starting equipment and cycloconverter for controlling speed, power factor, and regulating line voltage during load pulsing where the generator speed changes from 87.5 to 60 Hz frequency variation to provide the 4,500 MJ or energy. The special design characteristics such as fatigue stress calculations for 10 6 cycles of operation, forcing factor on exciter to provide regulation, and low generator impedance are reviewed

  15. Libert-E Motor

    Science.gov (United States)

    Sieloff, Susan F.; Kinnunen, Raymond; Chevarley, Joseph

    2011-01-01

    Kei Yun Wong has big dreams. She has been entrusted with the United States launch of Libert-E Motor, a new line of Chinese-manufactured electric scooters. With only $750,000 of her original budget of $3 million left, she needs to make sure that the launch succeeds, as it represents the initial step in her desire to create the first Chinese global…

  16. 350 KVA motor generators

    CERN Multimedia

    CERN PhotoLab

    1974-01-01

    Each logic circuit in the central computers consumes only a fraction of a watt: however, the final load constituted by many such circuits plus peripheral equipment is nearly half a million watts. Shown here are two 350 KVA motor generators used to convert 50 Hz mains to 60 Hz (US standard). Flywheels on the M.G. shafts remove power dropouts of up to 0.5 s.

  17. Motor Fuel Excise Taxes

    Energy Technology Data Exchange (ETDEWEB)

    2015-09-01

    A new report from the National Renewable Energy Laboratory (NREL) explores the role of alternative fuels and energy efficient vehicles in motor fuel taxes. Throughout the United States, it is common practice for federal, state, and local governments to tax motor fuels on a per gallon basis to fund construction and maintenance of our transportation infrastructure. In recent years, however, expenses have outpaced revenues creating substantial funding shortfalls that have required supplemental funding sources. While rising infrastructure costs and the decreasing purchasing power of the gas tax are significant factors contributing to the shortfall, the increased use of alternative fuels and more stringent fuel economy standards are also exacerbating revenue shortfalls. The current dynamic places vehicle efficiency and petroleum use reduction polices at direct odds with policies promoting robust transportation infrastructure. Understanding the energy, transportation, and environmental tradeoffs of motor fuel tax policies can be complicated, but recent experiences at the state level are helping policymakers align their energy and environmental priorities with highway funding requirements.

  18. Motor car driving; Kraftfahrzeugfuehrung

    Energy Technology Data Exchange (ETDEWEB)

    Juergensohn, T. [Technische Univ. Berlin (Germany). ISS-Fahrzeugtechnik; Timpe, K.P. (eds.) [Technische Univ. Berlin (DE). Zentrum Mensch-Maschine-Systeme (ZMMS)

    2001-07-01

    This is the first comprehensive book on motor car driving, i.e. all aspects of motor car technology that cannot be looked at separately from the needs, characteristics and limitations of the human driver. This includes ergonomics as well as the design of the driver interface in consideration of the findings of cognitive science, problems of driving simulation in the context of simulation of technical systems, problems relating to optimal car automation up to traffic psychology. The book is in honour of Prof. Dr. Willumeit who died in summer 2000. Prof. Willumeit was one of the few scientists in Germany who had been an expert on all aspects of motor car driving for many years. [German] Erstmalig wird das Thema der Fahrzeugfuehrung geschlossen dargestellt. Die Thematik der 'Kraftfahrzeugfuehrung' umfasst in diesem Zusammenhang alle Aspekte der Kraftfahrzeugtechnik, die nicht isoliert von den Erfordernissen, Eigenschaften und Grenzen des menschlichen Fahrers betrachtet werden koennen. Dies beinhaltet u.a. Probleme der Ergonomie, aber auch Fragen nach einer kognitionswissenschaftlich unterstuetzten Schnittstellengestaltung, Fragen der Simulation des Fahrverhalten im Kontext der Simulation technischer Systeme oder Fragen einer optimalen Fahrzeugautomatisierung bis hin zu verkehrspsychologischen Aspekten. Das Buch ist als Gedenkband fuer Prof. Dr. Willumeit konzipiert, der im Sommer 2000 verstarb. Prof. Willumeit war einer der wenigen Wissenschaftler in Deutschland, der ueber viele Jahre diese Thematik der Kraftfahrzeugfuehrung in ihrer vollen Breite verfolgte. (orig.)

  19. DANÇA E O DESENVOLVIMENTO MOTOR DE PORTADORES DE NECESSIDADES EDUCATIVAS ESPECIAIS - PNEEs

    Directory of Open Access Journals (Sweden)

    Liliane de Oliveira

    2012-04-01

    Full Text Available O estudo objetivou verificar as modificações nos padrões de desenvolvimento motor de PNEEs mediante prática da dança. Participaram 14 PNEEs do CIEP/Cruz Alta. O instrumento foi a Escala de Desenvolvimento Motor (Rosa Neto, 1996. Utilizou-se a estatística descritiva e teste “t” para análise dos dados. Observou-se diferenças estatisticamente significativas (p<0,05 entre pré e pós-testes nas variáveis idade cronológica, motora geral, motricidade ampla e equilíbrio. Concluiu-se que o programa de dança contribuiu significativamente para o desenvolvimento motor de PNEEs. Palavras chave: dança, motor, desenvolvimento, especial, educação.

  20. 76 FR 647 - Energy Conservation Program: Test Procedures for Electric Motors and Small Electric Motors

    Science.gov (United States)

    2011-01-05

    ... Electric Motors and Small Electric Motors; Proposed Rule #0;#0;Federal Register / Vol. 76, No. 3... Motors and Small Electric Motors AGENCY: Office of Energy Efficiency and Renewable Energy, Department of... motors and small electric motors, clarify the scope of energy conservation standards for electric motors...

  1. 46 CFR 111.70-3 - Motor controllers and motor-control centers.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Motor controllers and motor-control centers. 111.70-3... ELECTRIC SYSTEMS-GENERAL REQUIREMENTS Motor Circuits, Controllers, and Protection § 111.70-3 Motor controllers and motor-control centers. (a) General. The enclosure for each motor controller or motor-control...

  2. Diagnosis system for nozzles in high voltage equipment; Sistema de diagnostico para boquillas en equipos de alta tension

    Energy Technology Data Exchange (ETDEWEB)

    Ramirez Nino, Jose; Escorsa Morales, Oscar [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico); Lopez Azamar, Ernesto [Comision Federal de Electricidad (Mexico)

    2000-07-01

    boquillas y que permitan prever su posible falla, el Instituto de investigaciones electricas (IIE) realizo para el laboratorio de pruebas de equipos y, materiales (LAPEM) de la Comision Federal de Electricidad (CFE), un proyecto para el desarrollo de un sistema para la medicion de corrientes capacitivas en estos equipos. Este sistema permite determinar la variacion en capacitancia y perdidas dielectricas, asi como la presencia de descargas parciales internas en boquillas de 115, 230 y 400 kV. Con esta informacion es posible determinar el estado del aislamiento interno de las boquillas y retirarlas del servicio antes de que se produzca un deterioro que ponga en peligro la integridad del equipo. La gerencia de equipos electricos del Instituto de Investigaciones Electricas desarrollo para el LAPEM un sistema que mide corrientes capacitivas de boquillas de transformadores de potencia. Este sistema se diseno con el fin de instalarse en un transformador de maquina de 400 kV en la central termoelectrica de Tula, Hidalgo, de la Comision Federal de Electricidad.

  3. Performance Comparison between a Permanent Magnet Synchronous Motor and an Induction Motor as a Traction Motor for High Speed Train

    Science.gov (United States)

    Kondo, Minoru; Kawamura, Junya; Terauchi, Nobuo

    Performance tests are carried out to demonstrate the superiority of a permanent magnet synchronous motor to an induction motor as a traction motor for high-speed train. A prototype motor was manufactured by replacing the rotor of a conventional induction motor. The test results show that the permanent magnet motor is lighter, efficient and more silent than the induction motor because of the different rotor structure.

  4. Neurons other than motor neurons in motor neuron disease.

    Science.gov (United States)

    Ruffoli, Riccardo; Biagioni, Francesca; Busceti, Carla L; Gaglione, Anderson; Ryskalin, Larisa; Gambardella, Stefano; Frati, Alessandro; Fornai, Francesco

    2017-11-01

    Amyotrophic lateral sclerosis (ALS) is typically defined by a loss of motor neurons in the central nervous system. Accordingly, morphological analysis for decades considered motor neurons (in the cortex, brainstem and spinal cord) as the neuronal population selectively involved in ALS. Similarly, this was considered the pathological marker to score disease severity ex vivo both in patients and experimental models. However, the concept of non-autonomous motor neuron death was used recently to indicate the need for additional cell types to produce motor neuron death in ALS. This means that motor neuron loss occurs only when they are connected with other cell types. This concept originally emphasized the need for resident glia as well as non-resident inflammatory cells. Nowadays, the additional role of neurons other than motor neurons emerged in the scenario to induce non-autonomous motor neuron death. In fact, in ALS neurons diverse from motor neurons are involved. These cells play multiple roles in ALS: (i) they participate in the chain of events to produce motor neuron loss; (ii) they may even degenerate more than and before motor neurons. In the present manuscript evidence about multi-neuronal involvement in ALS patients and experimental models is discussed. Specific sub-classes of neurons in the whole spinal cord are reported either to degenerate or to trigger neuronal degeneration, thus portraying ALS as a whole spinal cord disorder rather than a disease affecting motor neurons solely. This is associated with a novel concept in motor neuron disease which recruits abnormal mechanisms of cell to cell communication.

  5. Comparison of capabilities of reluctance synchronous motor and induction motor

    International Nuclear Information System (INIS)

    Stumberger, Gorazd; Hadziselimovic, Miralem; Stumberger, Bojan; Miljavec, Damijan; Dolinar, Drago; Zagradisnik, Ivan

    2006-01-01

    This paper compares the capabilities of a reluctance synchronous motor (RSM) with those of an induction motor (IM). An RSM and IM were designed and made, with the same rated power and speed. They differ only in the rotor portion while their stators, housings and cooling systems are identical. The capabilities of both motors in a variable speed drive are evaluated by comparison of the results obtained by magnetically nonlinear models and by measurements

  6. Methodology for the accelerated simulation of the deterioration that by atmospheric corrosion appears in electronic equipment; Metodologia para la simulacion acelerada del deterioro que por corrosion atmosferica se presenta en equipo electronico

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz Prado, A.; Schouwenaars, R.; Cerrud Sanchez, S.M. [Facultad de Ingenieria, UNAM, Mexico, D.F. (Mexico)

    2002-12-01

    The corrosion resistance of systems and electronic parts which are designed to work in atmospheric conditions have been tested for decades; some of these methods were the Cyclic Humidity Test, Field Tests and Salt Spray (Fog) Testing, the latter was one of the most popular methods. However, the salt spray test and most of the other existing methods do not show strong relationships with the real conditions of service. For this reason, it is necessary to develop appropriated methods and equipment for the accelerated simulation of real atmospheric corrosion phenomena. This article seeks to demonstrate the need to develop a test and the necessary equipment to reproduce the damage in electronic systems and equipment by atmospheric corrosion. [Spanish] Para la evaluacion de la resistencia a la corrosion de sistemas y equipo electronico que trabajaran bajo condiciones de deterioro generadas por el medio ambiente, se han aplicado una serie de ensayos, donde el mas popular es el de camara de niebla salina. Sin embargo, este y otros que se han elaborado para tal efecto no tienen ninguna relacion con las condiciones reales de servicio, por lo que es necesario un metodo de evaluacion que permita simular de forma acelerada los fenomenos de deterioro por efectos ambientales. Este articulo pretende demostrar la necesidad de desarrollar una prueba, que en forma acelerada, reproduzca el dano que sufre el material por efecto de la atmosfera; el cual se orienta a la evaluacion de equipo electrico y electronico.

  7. Control of synchronous motors

    CERN Document Server

    Louis, Jean-Paul

    2013-01-01

    Synchronous motors are indubitably the most effective device to drive industrial production systems and robots with precision and rapidity. Their control law is thus critical for combining at the same time high productivity to reduced energy consummation. As far as possible, the control algorithms must exploit the properties of these actuators. Therefore, this work draws on well adapted models resulting from the Park's transformation, for both the most traditional machines with sinusoidal field distribution and for machines with non-sinusoidal field distribution which are more and more used in

  8. Electric Motors for Vehicle Propulsion

    OpenAIRE

    Larsson, Martin

    2014-01-01

    This work is intended to contribute with knowledge to the area of electic motorsfor propulsion in the vehicle industry. This is done by first studying the differentelectric motors available, the motors suitable for vehicle propulsion are then dividedinto four different types to be studied separately. These four types are thedirect current, induction, permanent magnet and switched reluctance motors. Thedesign and construction are then studied to understand how the different typesdiffer from ea...

  9. High efficiency motor selection handbook

    Science.gov (United States)

    McCoy, Gilbert A.; Litman, Todd; Douglass, John G.

    1990-10-01

    Substantial reductions in energy and operational costs can be achieved through the use of energy-efficient electric motors. A handbook was compiled to help industry identify opportunities for cost-effective application of these motors. It covers the economic and operational factors to be considered when motor purchase decisions are being made. Its audience includes plant managers, plant engineers, and others interested in energy management or preventative maintenance programs.

  10. Motor development of blind toddler

    OpenAIRE

    Likar, Petra

    2013-01-01

    For blind toddlers, development of motor skills enables possibilities for learning and exploring the environment. The purpose of this graduation thesis is to systematically mark the milestones in development of motor skills in blind toddlers, to establish different factors which affect this development, and to discover different ways for teachers for visually impaired and parents to encourage development of motor skills. It is typical of blind toddlers that they do not experience a wide varie...

  11. Motor fuel prices in Turkey

    International Nuclear Information System (INIS)

    Erdogdu, Erkan

    2014-01-01

    The world's most expensive motor fuel (gasoline, diesel and LPG) is sold most likely in the Republic of Turkey. This paper investigates the key issues related to the motor fuel prices in Turkey. First of all, the paper analyses the main reason behind high prices, namely motor fuel taxes in Turkey. Then, it estimates the elasticity of motor fuel demand in Turkey using an econometric analysis. The findings indicate that motor fuel demand in Turkey is quite inelastic and, therefore, not responsive to price increases caused by an increase in either pre-tax prices or taxes. Therefore, fuel market in Turkey is open to opportunistic behavior by firms (through excessive profits) and the government (through excessive taxes). Besides, the paper focuses on the impact of high motor fuel prices on road transport associated activities, including the pattern of passenger transportation, motorization rate, fuel use, total kilometers traveled and CO 2 emissions from road transportation. The impact of motor fuel prices on income distribution in Turkey and Turkish public opinion about high motor fuel prices are also among the subjects investigated in the course of the study. - Highlights: • The key issues (e.g. taxes) related to motor fuel prices in Turkey are explored. • Their impact on transport activities and income distribution is also investigated. • An econometric analysis is performed to estimate motor fuel demand in Turkey. • Motor fuel demand in Turkey is found to be quite inelastic. • Turkish fuel market is open to opportunistic behavior by firms and the government

  12. Evaluación del funcionamiento de motores de combustión interna trabajando con biodiesel.

    OpenAIRE

    R. Piloto Rodríguez; R. Sierens; S. Verhelst; N. Ferrer Frontela

    2008-01-01

    En el presente trabajo se determinó la característica exterior de velocidad para dos motores de combustión interna trabajando con combustible biodiesel procedente de varias fuentes naturales y se comparó con la característica exterior de velocidad de los motores originalmente trabajando con combustible diesel. Los motores fueron evaluados con variaciones de carga y velocidad. En uno de los motores ensayados fue determinada la presión en el interior de la cámara de combustión con el objetivo d...

  13. Motor of the future - superconducting

    International Nuclear Information System (INIS)

    Moen, Odd

    2001-01-01

    High-temperature superconductors count as the most innovative and future-oriented technology for electric motors. When these materials are used, the engine rating can be doubled and at the same time the losses halved while retaining the same size of construction. Siemens have recently developed a synchronous motor based on a high-temperature superconducting excitation winding. The rated power of the motor is 380 kW. The high-temperature superconductor that is used in this motor requires considerably less cooling outfit than low-temperature superconductors

  14. Overview of Bearingless Induction Motors

    Directory of Open Access Journals (Sweden)

    Xiaodong Sun

    2014-01-01

    Full Text Available Bearingless induction motors combining functions of both torque generation and noncontact magnetic suspension together have attracted more and more attention in the past decades due to their definite advantages of compactness, simple structure, less maintenance, no wear particles, high rotational speed, and so forth. This paper overviews the key technologies of the bearingless induction motors, with emphasis on motor topologies, mathematical models, and control strategies. Particularly, in the control issues, the vector control, independent control, direct torque control, nonlinear decoupling control, sensorless control, and so forth are investigated. In addition, several possible development trends of the bearingless induction motors are also discussed.

  15. Gap junctions and motor behavior

    DEFF Research Database (Denmark)

    Kiehn, Ole; Tresch, Matthew C.

    2002-01-01

    The production of any motor behavior requires coordinated activity in motor neurons and premotor networks. In vertebrates, this coordination is often assumed to take place through chemical synapses. Here we review recent data suggesting that electrical gap-junction coupling plays an important role...... in coordinating and generating motor outputs in embryonic and early postnatal life. Considering the recent demonstration of a prevalent expression of gap-junction proteins and gap-junction structures in the adult mammalian spinal cord, we suggest that neuronal gap-junction coupling might also contribute...... to the production of motor behavior in adult mammals....

  16. Design of an HTS motor

    Energy Technology Data Exchange (ETDEWEB)

    Jiang, Y; Pei, R; Hong, Z; Jiang, Q; Coombs, T A [Cambridge University engineering Department, Trumpington Street, Cambridge CB2 1PZ (United Kingdom)], E-mail: yj222@cam.ac.uk

    2008-02-01

    This paper gives a detailed description of the design of a high temperature superconducting (HTS) motor. The stator of the motor consists of six air cored HTS racetrack windings, together with an iron shield. The rotor is made of 80 superconducting YBCO pucks, which can be magnetized and equates to a four-pole permanent magnet. The whole HTS motor is cooled by liquid nitrogen to 77K, and acts as a permanent magnet synchronous motor with the power rate of 15.7 kW.

  17. Experiments with a dc motor

    International Nuclear Information System (INIS)

    Kraftmakher, Yaakov

    2010-01-01

    Experiments with an electric motor provide good opportunity to demonstrate some basic laws of electricity and magnetism. The aim of the experiments with a low-power dc motor is to show how the motor approaches its steady rotation and how its torque, mechanical power and efficiency depend on the rotation velocity. The tight relationship between the mechanical and electrical parameters of the motor is clearly seen. The measurements are carried out with the ScienceWorkshop data-acquisition system and the DataStudio software from PASCO scientific. The experiments are well related to university courses of electricity and magnetism and can be used in undergraduate laboratories or for lecture demonstrations.

  18. Harmonic modeling of induction motors

    Energy Technology Data Exchange (ETDEWEB)

    Pedra, J.; Sainz, L.; Corcoles, F. [Department of Electrical Engineering, ETSEIB-UPC, Av. Diagonal 647, 08028 Barcelona (Spain)

    2006-07-15

    The paper proposes an induction motor model for the study of harmonic load flow in balanced and unbalanced conditions. The parameters of this model are obtained from motor manufacturer data and the positive- and negative-sequence equivalent circuits of the single- and double-cage models. An approximate harmonic model based on motor manufacturer data only is also proposed. In addition, the paper includes manufacturer data and the calculated parameters of 36 induction motors of different rated powers. This database is used to analyze the proposed models. (author)

  19. Mezclas gasolina-etanol en motores de combustión interna en Colombia

    OpenAIRE

    Juan Mantilla; Carlos Galeano; Alejandro Muñoz

    2016-01-01

    En este trabajo se analiza el cambio sobre el desempeño y las emisiones de los motores encendidos por chispa cuando la gasolina es reemplazada por una mezcla de gasolina y etanol. Inicialmente se investiga la diferencia en las propiedades fisicoquímicas del combustible, y sus posibles efectos sobre el motor. Posteriormente se examina el efecto documentado del cambio de combustible en el desempeño y las emisiones del motor. Para llevar a cabo estos objetivos se realizó una revisión bibliográfi...

  20. Motor carrier evaluation program

    International Nuclear Information System (INIS)

    Portsmouth, James

    1992-01-01

    The U.S. Department of Energy-Headquarters (DOE-HQ), Transportation Management Program (TMP) has the overall responsibility to provide a well-managed transportation program for the safe, efficient, and economical transportation of DOE-owned materials. The DOE-TMP has established an excellent safety record in the transportation of hazardous materials including radioactive materials and radioactive wastes. This safety record can be maintained only through continued diligence and sustained effort on the part of the DOE-TMP, its field offices, and the contractors' organizations. Key elements in the DOE'S effective hazardous and radioactive materials shipping program are (1) integrity of packages, (2) strict adherence to regulations and procedures, (3) trained personnel, (4) complete management support, and (5) use of the best commercial carriers. The DOE Motor Carrier Evaluation Program was developed to better define the criteria and methodology needed to identify motor carriers for use in the transportation of Highway Route Controlled Quantities (HRCQ), Truck Load (TL) quantities of radioactive materials, hazardous materials and waste. (author)

  1. Zenn Motor Company

    Energy Technology Data Exchange (ETDEWEB)

    Clifford, I. [Zenn Motor Company, Toronto, ON (Canada)

    2010-07-01

    Zenn Motor company is a leader in the electric vehicle space and builds and markets a low speed vehicle known as the zero emission, no noise (ZENN). This presentation provided background information on the Zenn Motor Company as well as on EEStor, a company that develops four-wheeled vehicles and that is seeking partners to fund the development for a modified barium titanate-based ultracapacitor. In 2004, ZENN entered into a technology agreement with EEStor that secured certain exclusive and non-exclusive rights to purchase and deploy EEStor's EESU technology as part of its ZENNergy solutions in several markets, including exclusive rights for new four-passenger vehicles with a curb weight of up to 1,400 kilograms; exclusive rights for the neighbourhood electric vehicles (NEV) and golf carts market; exclusive rights for utility vehicles; and exclusive rights for the aftermarket conversion to ZENNergy of any four-wheeled vehicles. The presentation also addressed ZENNergy and the art of integrating high energy drive solutions. Lessons learned and EEStor's technology attributes were discussed. A hypothetical case study was also offered. The presentation concluded with a discussion of EEStor technology status and opportunity horizons. It was concluded that a better battery is needed to enable the mass adoption of electric vehicles. tabs.

  2. Motor-operated valve (MOV) actuator motor and gearbox testing

    International Nuclear Information System (INIS)

    DeWall, K.; Watkins, J.C.; Bramwell, D.

    1997-07-01

    Researchers at the Idaho National Engineering and Environmental Laboratory tested the performance of electric motors and actuator gearboxes typical of the equipment installed on motor-operated valves used in nuclear power plants. Using a test stand that simulates valve closure loads against flow and pressure, the authors tested five electric motors (four ac and one dc) and three gearboxes at conditions a motor might experience in a power plant, including such off-normal conditions as operation at high temperature and reduced voltage. They also monitored the efficiency of the actuator gearbox. All five motors operated at or above their rated starting torque during tests at normal voltages and temperatures. For all five motors, actual torque losses due to voltage degradation were greater than the losses calculated by methods typically used for predicting motor torque at degraded voltage conditions. For the dc motor the actual torque losses due to elevated operating temperatures were greater than the losses calculated by the typical predictive method. The actual efficiencies of the actuator gearboxes were generally lower than the running efficiencies published by the manufacturer and were generally nearer the published pull-out efficiencies. Operation of the gearbox at elevated temperature did not affect the operating efficiency

  3. Evaluation of the national cogeneration potential as an option for the expansion of the national electric system; Evaluacion del potencial nacional de cogeneracion como opcion en la expansion del sistema electrico nacional

    Energy Technology Data Exchange (ETDEWEB)

    Nieva Gomez, Rolando; Hernandez Galicia, Julio Alberto [Instituto de Investigaciones Electricas, Cuernavaca (Mexico); Portes Mascorro, Enrique; Alvarez Chavez, Jose Maria [Comision Nacional para el Ahorro de Energia (CONAE), Mexico, D. F. (Mexico)

    1997-12-31

    The Comision Nacional para el Ahorro de Energia (CONAE) carried out a study to determine the amount of electric energy available by cogeneration in the industrial sector of our country. This study is based in a survey among the enterprises with the largest fuel consumption belonging to the industrial and commercial sectors and to the petrochemical branch of Petroleos Mexicanos (PEMEX). The results of the study are presented, which show the location of the cogeneration potential by the following estimates: a) The scenario under a potential of 5770 MW to generate annually 4.55 x 107 MWh of electric energy. b) The scenario with a potential of 10819 MW to generate annually 9.47 x 107 Mwh of electric energy [Espanol] La Comision Nacional para el Ahorro de Energia (CONAE) llevo acabo un estudio para determinar la cantidad de energia electrica disponible por cogeneracion en el sector industrial de nuestro pais. El estudio se fundamenta en una encuesta entre las empresas con mayor consumo de combustibles pertenecientes a los sectores industrial y comercial y al ramo petroquimico de Petroleos Mexicanos (PEMEX). Se presentan los resultados del estudio, el cual muestra la ubicacion del potencial de cogeneracion por los siguientes estimados: a) El escenario bajo con un potencial de 5770 MW para producir anualmente 4.55 x 107 Mwh de energia electrica. b) El escenario alto con un potencial de 10819 MW para producir anualmente 9.47 x 107 MWh de energia electrica

  4. Evaluation of the national cogeneration potential as an option for the expansion of the national electric system; Evaluacion del potencial nacional de cogeneracion como opcion en la expansion del sistema electrico nacional

    Energy Technology Data Exchange (ETDEWEB)

    Nieva Gomez, Rolando; Hernandez Galicia, Julio Alberto [Instituto de Investigaciones Electricas, Cuernavaca (Mexico); Portes Mascorro, Enrique; Alvarez Chavez, Jose Maria [Comision Nacional para el Ahorro de Energia (CONAE), Mexico, D. F. (Mexico)

    1998-12-31

    The Comision Nacional para el Ahorro de Energia (CONAE) carried out a study to determine the amount of electric energy available by cogeneration in the industrial sector of our country. This study is based in a survey among the enterprises with the largest fuel consumption belonging to the industrial and commercial sectors and to the petrochemical branch of Petroleos Mexicanos (PEMEX). The results of the study are presented, which show the location of the cogeneration potential by the following estimates: a) The scenario under a potential of 5770 MW to generate annually 4.55 x 107 MWh of electric energy. b) The scenario with a potential of 10819 MW to generate annually 9.47 x 107 Mwh of electric energy [Espanol] La Comision Nacional para el Ahorro de Energia (CONAE) llevo acabo un estudio para determinar la cantidad de energia electrica disponible por cogeneracion en el sector industrial de nuestro pais. El estudio se fundamenta en una encuesta entre las empresas con mayor consumo de combustibles pertenecientes a los sectores industrial y comercial y al ramo petroquimico de Petroleos Mexicanos (PEMEX). Se presentan los resultados del estudio, el cual muestra la ubicacion del potencial de cogeneracion por los siguientes estimados: a) El escenario bajo con un potencial de 5770 MW para producir anualmente 4.55 x 107 Mwh de energia electrica. b) El escenario alto con un potencial de 10819 MW para producir anualmente 9.47 x 107 MWh de energia electrica

  5. Avaliação e intervenção no desenvolvimento motor de uma criança com Síndrome de Down Assessment and intervention in the motor development of a child with Down Syndrome

    Directory of Open Access Journals (Sweden)

    Ana Paula Maurilia dos Santos

    2010-04-01

    Full Text Available o objetivo deste estudo foi analisar o desenvolvimento motor de uma criança com síndrome de Down e verificar os efeitos de um programa de intervenção motora específica. Trata-se de uma pesquisa descritiva do tipo estudo de caso. Para a avaliação do desenvolvimento motor foram utilizados os testes da Escala de Desenvolvimento Motor - EDM que analisa as áreas da motricidade fina e global, equilíbrio, esquema corporal, organização espacial e temporal/linguagem, e lateralidade. Essa criança participou, respectivamente, de avaliação motora, intervenção motora (32 sessões, 2 vezes semanais e reavaliação motora. As intervenções motoras mostraram avanços positivos nas áreas da motricidade global, equilíbrio e organização espacial. A motricidade fina, esquema corporal e a organização temporal /linguagem não apresentaram avanços. Verificou-se que a linguagem foi a área de maior prejuízo. O quociente motor em todos os itens foi classificado como muito inferior, o que se caracteriza como déficit motor. Esses dados justificam a relevância de programas de intervenção motora para essa população.the objective of this study was to analyze the motor development of a child with Down syndrome and to verify the effect of a specific motor intervention program. This is a descriptive research case study. Motor development was evaluated using the Motor Development Scale - MDS, which analyzes both fine and gross motor skills as well as balance, body schema, spatial and temporal organization, language, and laterality. This child participated, respectively, of the motor assessment, motor intervention (32 sessions, twice weekly and motor reevaluation. Gains were demonstrated in motor intervention in the areas of the gross motor skills, balance and spatial organization. No improvement was shown in fine motor skills, body schema and temporal organization/ language. Language was found to be the area of lowest achievement. The motor

  6. Torque control for electric motors

    Science.gov (United States)

    Bernard, C. A.

    1980-01-01

    Method for adjusting electric-motor torque output to accomodate various loads utilizes phase-lock loop to control relay connected to starting circuit. As load is imposed, motor slows down, and phase lock is lost. Phase-lock signal triggers relay to power starting coil and generate additional torque. Once phase lock is recoverd, relay restores starting circuit to its normal operating mode.

  7. Open-Ended Electric Motor

    Science.gov (United States)

    Gould, Mauri

    1975-01-01

    Presents complete instructions for assembling an electric motor which does not require large amounts of power to operate and which is inexpensive as well as reliable. Several open-ended experiments with the motor are included as well as information for obtaining a kit of parts and instructions. (BR)

  8. Genetic heterogeneity of motor neuropathies.

    Science.gov (United States)

    Bansagi, Boglarka; Griffin, Helen; Whittaker, Roger G; Antoniadi, Thalia; Evangelista, Teresinha; Miller, James; Greenslade, Mark; Forester, Natalie; Duff, Jennifer; Bradshaw, Anna; Kleinle, Stephanie; Boczonadi, Veronika; Steele, Hannah; Ramesh, Venkateswaran; Franko, Edit; Pyle, Angela; Lochmüller, Hanns; Chinnery, Patrick F; Horvath, Rita

    2017-03-28

    To study the prevalence, molecular cause, and clinical presentation of hereditary motor neuropathies in a large cohort of patients from the North of England. Detailed neurologic and electrophysiologic assessments and next-generation panel testing or whole exome sequencing were performed in 105 patients with clinical symptoms of distal hereditary motor neuropathy (dHMN, 64 patients), axonal motor neuropathy (motor Charcot-Marie-Tooth disease [CMT2], 16 patients), or complex neurologic disease predominantly affecting the motor nerves (hereditary motor neuropathy plus, 25 patients). The prevalence of dHMN is 2.14 affected individuals per 100,000 inhabitants (95% confidence interval 1.62-2.66) in the North of England. Causative mutations were identified in 26 out of 73 index patients (35.6%). The diagnostic rate in the dHMN subgroup was 32.5%, which is higher than previously reported (20%). We detected a significant defect of neuromuscular transmission in 7 cases and identified potentially causative mutations in 4 patients with multifocal demyelinating motor neuropathy. Many of the genes were shared between dHMN and motor CMT2, indicating identical disease mechanisms; therefore, we suggest changing the classification and including dHMN also as a subcategory of Charcot-Marie-Tooth disease. Abnormal neuromuscular transmission in some genetic forms provides a treatable target to develop therapies. Copyright © 2017 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology.

  9. Energy-saving motor; Energiesparmotor

    Energy Technology Data Exchange (ETDEWEB)

    Lindegger, M.

    2002-07-01

    This report for the Swiss Federal Office of Energy (SFOE) describes the development and testing of an advanced electrical motor using a permanent-magnet rotor. The aims of the project - to study the technical feasibility and market potential of the Eco-Motor - are discussed and the three phases of the project described. These include the calculation and realisation of a 250-watt prototype operating at 230 V, the measurement of the motor's characteristics as well as those of a comparable asynchronous motor on the test bed at the University of Applied Science in Lucerne, Switzerland, and a market study to establish if the Eco-Motor and its controller can compete against normal asynchronous motors. Also, the results of an analysis of the energy-savings potential is made, should such Eco-Motors be used. Detailed results of the three phases of the project are presented and the prospects of producing such motors in Switzerland for home use as well as for export are examined.

  10. Advances in esophageal motor disorders

    NARCIS (Netherlands)

    Smout, André Jpm

    2008-01-01

    PURPOSE OF REVIEW: Esophageal motor disorders, often leading to dysphagia and chest pain, continue to pose diagnostic and therapeutic problems. In the past 12 months important new information regarding esophageal motor disorders was published. This information will be reviewed in this paper. RECENT

  11. Advances in esophageal motor disorders

    NARCIS (Netherlands)

    Smout, Andre J. P. M.

    Purpose of review Esophageal motor disorders, often leading to dysphagia and chest pain, continue to pose diagnostic and therapeutic problems. In the past 12 months important new information regarding esophageal motor disorders was published. This information will be reviewed in this paper. Recent

  12. 77 FR 26607 - Energy Conservation Program: Test Procedures for Electric Motors and Small Electric Motors

    Science.gov (United States)

    2012-05-04

    ... Conservation Program: Test Procedures for Electric Motors and Small Electric Motors; Final Rules #0;#0;Federal... Procedures for Electric Motors and Small Electric Motors AGENCY: Office of Energy Efficiency and Renewable... electric motors and small electric motors. That supplemental proposal, along with an earlier proposal from...

  13. Piezoelectric wave motor

    Science.gov (United States)

    Yerganian, Simon Scott

    2001-07-17

    A piezoelectric motor having a stator in which piezoelectric elements are contained in slots formed in the stator transverse to the desired wave motion. When an electric field is imposed on the elements, deformation of the elements imposes a force perpendicular to the sides of the slot, deforming the stator. Appropriate frequency and phase shifting of the electric field will produce a wave in the stator and motion in a rotor. In a preferred aspect, the piezoelectric elements are configured so that deformation of the elements in direction of an imposed electric field, generally referred to as the d.sub.33 direction, is utilized to produce wave motion in the stator. In a further aspect, the elements are compressed into the slots so as to minimize tensile stresses on the elements in use.

  14. Reciprocating linear motor

    Science.gov (United States)

    Goldowsky, Michael P. (Inventor)

    1987-01-01

    A reciprocating linear motor is formed with a pair of ring-shaped permanent magnets having opposite radial polarizations, held axially apart by a nonmagnetic yoke, which serves as an axially displaceable armature assembly. A pair of annularly wound coils having axial lengths which differ from the axial lengths of the permanent magnets are serially coupled together in mutual opposition and positioned with an outer cylindrical core in axial symmetry about the armature assembly. One embodiment includes a second pair of annularly wound coils serially coupled together in mutual opposition and an inner cylindrical core positioned in axial symmetry inside the armature radially opposite to the first pair of coils. Application of a potential difference across a serial connection of the two pairs of coils creates a current flow perpendicular to the magnetic field created by the armature magnets, thereby causing limited linear displacement of the magnets relative to the coils.

  15. Economical motor transport operations

    Energy Technology Data Exchange (ETDEWEB)

    Cooke, P

    1979-09-01

    Motor transport is one area in a company where energy conservation is a function primarily of operative education and motivation rather than mechanical or technical control and monitoring. Unless the driver wants to save energy by proper operation of the vehicle, there is nothing the company can do to force him, whatever equipment it fits to the vehicles, or incentives it offers. This article gives an overview of the use of energy in road transport and examines a number of actions that can be taken to conserve energy. It discusses the question of the cost-effectiveness of transport energy conservation in the light of the complex issues involved. The problems and opportunities of implementing energy-saving programs are examined. (MCW)

  16. Stabilizing motor fuels

    Energy Technology Data Exchange (ETDEWEB)

    1935-07-12

    Motor fuel is stabilized by adding less than 2% of a tar fraction from peat, coal, torbanite or shale, said fraction containing sufficient constituents boiling between 200 and 325/sup 0/C, to inhibit gum formation. Low-temperature coal-tar fractions are specified. The preferred boiling ranges are from 225 or 250/sup 0/ to 275/sup 0/C. In examples, the quantity added was 0.01%. The fuel may be a cracked distillate of gasoline boiling-point range or containing gasoline, and may contain relatively large proportions of di- and tri-olefines. The material added to the fuel may be (1) the tar fraction itself; (2) its alkali-soluble constituents; (3) its acid-soluble constituents; (4) a mixture of (2) and (3); (5) a blend of (2), (3) or (4) with a normal tar fraction; (6) the residue after extraction with alkali; (7) the residue after extraction with acid and alkali.

  17. Sucker rod motor

    Energy Technology Data Exchange (ETDEWEB)

    Radzalov, N N; Radzhabov, N A

    1983-01-01

    The motor consists of rollers mounted on the wellmouth and connected by a flexible rink. Reciprocating mechanism is in the form of a horizontal non-mobile single-side operation cylinder, inside which a plunger and rod are mounted. The working housing of the hydrocylinder is connected to a gas-hydr aulic batter, and when running is connected via plunger to the high pressure source; running in reverse it is connected with a safety valve and automatic control unit. The unit is equipped with a reducer and a mechanical transformer consisting of screw and nut, and which is shutoff with a single-side lining. The plunger rod consists of an auger-like unit. The high pressure source is provided by the injection line of the sucker rod that has been equipped with a reverse valve.

  18. Motor-operated gearbox efficiency

    Energy Technology Data Exchange (ETDEWEB)

    DeWall, K.G.; Watkins, J.C.; Bramwell, D. [Idaho National Engineering Lab., Idaho Falls, ID (United States); Weidenhamer, G.H.

    1996-12-01

    Researchers at the Idaho National Engineering Laboratory recently conducted tests investigating the operating efficiency of the power train (gearbox) in motor-operators typically used in nuclear power plants to power motor-operated valves. Actual efficiency ratios were determined from in-line measurements of electric motor torque (input to the operator gearbox) and valve stem torque (output from the gearbox) while the operators were subjected to gradually increasing loads until the electric motor stalled. The testing included parametric studies under reduced voltage and elevated temperature conditions. As part of the analysis of the results, the authors compared efficiency values determined from testing to the values published by the operator manufacturer and typically used by the industry in calculations for estimating motor-operator capabilities. The operators they tested under load ran at efficiencies lower than the running efficiency (typically 50%) published by the operator manufacturer.

  19. Motor-operated gearbox efficiency

    International Nuclear Information System (INIS)

    DeWall, K.G.; Watkins, J.C.; Bramwell, D.; Weidenhamer, G.H.

    1996-01-01

    Researchers at the Idaho National Engineering Laboratory recently conducted tests investigating the operating efficiency of the power train (gearbox) in motor-operators typically used in nuclear power plants to power motor-operated valves. Actual efficiency ratios were determined from in-line measurements of electric motor torque (input to the operator gearbox) and valve stem torque (output from the gearbox) while the operators were subjected to gradually increasing loads until the electric motor stalled. The testing included parametric studies under reduced voltage and elevated temperature conditions. As part of the analysis of the results, the authors compared efficiency values determined from testing to the values published by the operator manufacturer and typically used by the industry in calculations for estimating motor-operator capabilities. The operators they tested under load ran at efficiencies lower than the running efficiency (typically 50%) published by the operator manufacturer

  20. Motor-operator gearbox efficiency

    International Nuclear Information System (INIS)

    DeWall, K.G.; Watkins, J.C.; Bramwell, D.

    1996-01-01

    Researchers at the Idaho National Engineering Laboratory recently conducted tests investigating the operating efficiency of the power train (gearbox) in motor-operators typically used in nuclear power plants to power motor-operated valves. Actual efficiency ratios were determined from in-line measurements of electric motor torque (input to the operator gearbox) and valve stem torque (output from the gearbox) while the operators were subjected to gradually increasing loads until the electric motor stalled. The testing included parametric studies under reduced voltage and elevated temperature conditions. As part of the analysis of the results, we compared efficiency values determined from testing to the values published by the operator manufacturer and typically used by the industry in calculations for estimating motor-operator capabilities. The operators we tested under load ran at efficiencies lower than the running efficiency (typically 50%) published by the operator manufacturer

  1. Electric motors for use in radiation environments

    International Nuclear Information System (INIS)

    Aslam, T.U.D.; Mahmood, S.B.

    1981-01-01

    Requirements of electric motors for a nuclear plant and the effect of nuclear radiations on different parts of the motors are discussed. Feasibility of using locally-fabricated motors is also considered. (author)

  2. VERY SLOW SPEED AXIAL MOTION RELUCTANCE MOTOR

    African Journals Online (AJOL)

    Dr Obe

    1984-09-01

    Sep 1, 1984 ... VERY SLOW SPEED AXIAL MOTION RELUCTANCE MOTOR by. L. A. Agu ... order as that of the screw-thread motor can be obtained. LIST OF .... The n stator have equal non- magnetic spacers .... induction motor. An.

  3. Actions to promote energy efficient electric motors. Motors study group

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, A.T. de [Coimbra Univ. (PT). Inst. of Systems and Robotics (ISR)

    1996-10-01

    Motor electricity consumption is influenced by many factors including: motor efficiency, motor speed controls, power supply quality, harmonics, systems oversizing, distribution network, mechanical transmission system, maintenance practices, load management and cycling, and the efficiency of the end-use device (e.g. fan, pump, etc.). Due to their importance, an overview of these factors is presented in this report. This study also describes the electricity use in the industrial and tertiary sectors and the electricity consumption associated with the different types of electric motors systems in the Member States of the European Union, as well as estimated future evolution until 2010. The studies for individual countries were carried out by the different partners of the motors study group at a previous stage. The study has found that there is a lack of accurate information about the motor electricity consumption, installed motor capacity and the motor market in almost all the European Union countries and only some general statistical sources are available. There is little field data, which is mainly available in Denmark, France, Italy and the Netherlands. Due to this lack of primary information, some common assumptions were made, based on the experience of the members of the study group. This lack of end-use characterisation data shows the need for improvement from the point of view of current knowledge. It is therefore recommended that further research is undertaken to arrive at more accurate figures. These could be the basis for a better understanding for motor use in practice and - as a consequence - for a more precise appraisal of potentials and barriers to energy efficiency. (orig.)

  4. Anthropometric and motor performance profile of elite futsal athletes

    Directory of Open Access Journals (Sweden)

    Leandro Ricardo Altimari

    2008-01-01

    Full Text Available The purpose of the present study was to identify the anthropometric and motor performance profile of futsal (indoor soccer athletes in the second and third-placed teams in the Parana state championships (Brazil. Anthropometric (body mass, stature and skinfolds thickness and motor performance (modified abdominal test, shuttle run, race of 30 m and 40 s measures were obtained from twenty-seven male athletes (24.7 ± 6.4 years; 73.6 ± 7.6 kg; 174.8 ± 6.6 cm. For data analysis, athletes were grouped according to game positions. ANOVA one-way was used for comparisons between different positions, followed by Scheffé’s post hoc test, with p ABSTRACT Este estudo objetivou identificar o perfil antropométrico e o desempenho motor de atletas de futsal masculino, pertencentes às equipes finalistas do campeonato paranaense da categoria adulto, chave ouro. Para tanto, coletou-se medidas antropométricas (massa corporal, estatura e espessura de dobras cutâneas e de desempenho motor (testes abdominal modificado, shuttle run, corrida de 30 m e corrida de 40 s de vinte e sete atletas (24,7 ± 6,4 anos; 73,6 ± 7,6 kg; 174,8 ± 6,6 cm, do sexo masculino. Para a análise dos dados, agrupou-se os atletas de acordo com a posição de jogo. Anova one-way foi empregada para as comparações entre os jogadores das diferentes posições, seguida pelo teste post hoc de Scheffé, com P < 0,05. Verificou-se diferença signifi cante entre os jogadores de diferentes posições de jogo nas variáveis: massa corporal (alas < goleiros, P < 0,01, estatura (alas < pivôs e goleiros, P < 0,01 e massa corporal magra (alas < goleiros, P < 0,01. Não foram observadas diferenças significantes entre os jogadores das diferentes posições de jogo nas variáveis de desempenho motor. Os resultados encontrados no presente estudo sugerem que atletas de futsal apresentam, na maioria das variáveis analisadas, características antropométricas e de desempenho motor semelhantes entre

  5. Uso de etanol carburado en motores Diesel

    Directory of Open Access Journals (Sweden)

    Rodríguez Luis Arnoby

    1990-06-01

    Full Text Available Este trabajo se ejecutó en el Taller de Maquinaria Agrícola de la Facultad de Ciencias Agropecuarias de la Universidad Nacional de Colombia, Seccional Palmira. Un motor diesel de 2 cilindros, 1260 cm3 y relación de comprensión 23:1, fue alimentado mediante un sistema dual formado por el sistema de inyección para ACPM y un sistema de carburación para etanol y mezclas etanol-agua. En primer término se varió el avance de la inyección entre 18 y 26° APMS(Antes de Punto Muerto Superior con el fin de determinar el avance óptimo de inyección en el motor original y el motor alimentado con el sistema dual. Con base en el punto de máxima potencia, se seleccionaron 20 y 22" como avances óptimos. En la segunda prueba, al operar el motor con carga y velocidad variables y alimentarlo con cuatro combustibles (ACPM, etanol y mezclas etanol- agua con 20 y 40 % agua, se incrementaron la velocidad en 10% la potencia máxima en 6.5% ; y el torque máximo en 3.73%, desde el motor original al sistema dual alimentado con la mezcla carburada de 40% agua. La mayor sustitución de combustible se presentó a alta velocidad donde se reemplazó hasta el 32 % de ACPM por etanol. Solo a alta velocidad se justifica la sobrealimentación con etanol carburado. En este rango se presentaron aumentos de potencia, velocidad, par torsor y sustitución de combustible.This work was performed in the Agricultural Mechanics Shop of the Universidad Nacional of Colombia in Palmira. A two-cylinder, 1260 cm3 diesel engine with a compression ratio of 23:1 was fueled by a dual system formed by its injection system for diesel oil and a carburation system for ethanol and ethanol-water blends. In a first test, m e injection advance was varied between 18 and 26 o BTDC (Before Top Dead Center to determine the optimum injection advance in the original engine and the engine fueled with the dual system. According to the maximum power point, 20 and 22° BTDC were selected as the optimum

  6. Submersible canned motor mixer pump

    International Nuclear Information System (INIS)

    Guardiani, R.F.; Pollick, R.D.

    1997-01-01

    A mixer pump is described used in a waste tank for mobilizing high-level radioactive liquid waste having a column assembly containing power cables, a motor housing with electric motor means which includes a stator can of a stator assembly and a rotor can of a rotor assembly, and an impeller assembly with an impeller connected to a shaft of the rotor assembly. The column assembly locates the motor housing with the electric motor means adjacent to the impeller which creates an hydraulic head, and which forces the liquid waste into the motor housing to cool the electric motor means and to lubricate radial and thrust bearing assemblies. Hard-on-hard bearing surfaces of the bearing assemblies and a ring assembly between the impeller and electric motor means act to grind down large particles in the liquid waste flow. These larger particles are received in slots in the static bearing members of the radial bearing assemblies. Only solid waste particles smaller than the clearances in the system can pass there through, thereby resisting damage to and the interruption of the operation of the mixer pump. 10 figs

  7. Pathogenesis of motor neuron disease

    Institute of Scientific and Technical Information of China (English)

    Xuefei Wang

    2006-01-01

    OBJECTIVE: To summarize and analyze the factors and theories related to the attack of motor neuron disease, and comprehensively investigate the pathogenesis of motor neuron disease.DATA SOURCES: A search of Pubmed database was undertaken to identify articles about motor neuron disease published in English from January 1994 to June 2006 by using the keywords of "neurodegenerative diseases". Other literatures were collected by retrieving specific journals and articles.STUDY SELECTION: The data were checked primarily, articles related to the pathogenesis of motor neuron disease were involved, and those obviously irrelated to the articles were excluded.DATA EXTRACTION: Totally 54 articles were collected, 30 of them were involved, and the other 24 were excluded.DATA SYNTHESIS: The pathogenesis of motor neuron disease has multiple factors, and the present related theories included free radical oxidation, excitotoxicity, genetic and immune factors, lack of neurotrophic factor,injury of neurofilament, etc. The studies mainly come from transgenic animal models, cell culture in vitro and patients with familial motor neuron disease, but there are still many restrictions and disadvantages.CONCLUSION: It is necessary to try to find whether there is internal association among different mechanisms,comprehensively investigate the pathogenesis of motor neuron diseases, in order to provide reliable evidence for the clinical treatment.

  8. Comparação do desenvolvimento motor de lactentes de mães adolescentes e adultas Motor development comparison between infants of adolescent and adult mothers

    Directory of Open Access Journals (Sweden)

    Naiane Sartori

    2010-12-01

    Full Text Available Este estudo objetivou caracterizar o desempenho motor de bebês de 0 a 16 meses, comparando o de bebês nascidos de mães adolescentes ao de bebês de mães adultas. Participaram 80 bebês, sendo 40 de mães adolescentes e 40 de mães adultas. Os instrumentos avaliativos foram a escala motora infantil de Alberta AIMS (Alberta infant motor scale e questionário para identificar as características biológicas. Os dados foram analisados estatisticamente. Os resultados da AIMS mostram pior desempenho motor dos bebês de mães adolescentes (p=0,002; p=0,001, além de suas inadequadas aquisições motoras nas posturas prono e em pé. Não foi encontrada associação significativa entre a maioria dos fatores biológicos analisados e o desenvolvimento motor dos bebês. Os resultados sugerem que a idade materna pode ser considerada fator de risco para atraso motor em crianças, porém ressalta-se a interação de diferentes fatores, aqui não controlados, influenciando as aquisições motoras de crianças, tais como as demandas da tarefa e as condições do ambiente.The purpose of the study was to compare motor development of infants aged 0 to 16 months born of teenage mothers to those of adult mothers. Eighty babies were assessed, 40 of which the children of teenage mothers, and 40 of adult mothers. Instruments used were the Alberta infant motor scale (AIMS and a questionnaire to collect biological information. Data were statistically analysed. Results show teenage mothers' infants to have delayed motor development as compared to adult mothers' ones (p=0.002; p=0.001, as well as their poor motor acquisitions in prone and standing positions. No association was found between infants' motor development and most of the biological factors analysed. Results hence suggest that early maternal age may be considered a risk factor to motor delay in infants, but attention should be paid to other factors such as task requirements and environmental conditions (here

  9. Entrenamiento motor en el continuo de la realidad a la virtualidad

    Directory of Open Access Journals (Sweden)

    Martha Torres-Narváez

    2018-01-01

    Full Text Available Introducción. La trasformación de la capacidad de movimiento de las personas es un reto que el fisioterapeuta asume como estrategia de aprendizaje motor. Objetivo. Plantear los referentes teóricos y prácticos más relevantes en el uso de ambientes terapéuticos en el continuo de la realidad a la virtualidad en el entrenamiento motor de pacientes con accidente cerebrovascular y enfermedad de Parkinson. Materiales y métodos. Revisión de la literatura que analiza y aporta de manera conceptual, en el área de la rehabilitación y la fisioterapia, información sobre entrenamiento y aprendizaje motor. Resultados. Se evidencia potencial en el uso de la realidad virtual para la rehabilitación de alteraciones del movimiento debidas a disfunciones neurológicas. Las herramientas tecnológicas propias de la realidad virtual permiten un mayor conocimiento de los resultados con respecto a las características del movimiento, lo cual ayuda a mejorar el aprendizaje motor, en comparación con el entrenamiento tradicional. Conclusiones. Se requiere objetivar el proceso de rehabilitación para medir con precisión los cambios que producen estrategias de aprendizaje en las capacidades de movimiento de las personas con deficiencias del sistema neuromuscular para generar evidencia del impacto que tienen los programas de entrenamiento motor en el continuo de la realidad a la virtualidad.

  10. Desempenho motor de lactentes frequentadores de berçários em creches públicas Motor performance of infants attending the nurseries of public day care centers

    Directory of Open Access Journals (Sweden)

    Letícia Baltieri

    2010-09-01

    Full Text Available OBJETIVO: Analisar o desempenho motor axial, apendicular e global e sua correlação com as características neonatais, familiares e de tempo de exposição à creche em crianças com idade entre 12-24 meses, frequentadoras de creches públicas. MÉTODOS: Estudo transversal com 40 lactentes (idade média 14,3±2,4 meses frequentadores de creches públicas. Os participantes foram avaliados quanto ao desempenho motor com a Bayley Scales of Infant and Toddler Development-III, a qual possibilita análise do desempenho motor e comparação dos domínios motores axial e apendicular. Foram coletados dados neonatais, familiares e de exposição à creche e pesquisou-se a correlação destes fatores ao desempenho motor. Foi utilizado o teste t pareado para comparar médias e a correlação de Pearson. RESULTADOS: O desempenho motor do grupo esteve, em média, abaixo da referência, com 22,5% das crianças classificadas como suspeitas de atraso nos desempenhos axial e global, contrastando com nenhuma no domínio apendicular. A comparação axial e apendicular apontou diferença significativa, com desempenho axial aquém do apendicular, além de 35% do grupo ter apresentado discrepância significativa entre esses domínios. Não foi encontrada correlação linear entre os domínios motores avaliados e as variáveis neonatais, familiares e de exposição à creche. CONCLUSÕES: O desempenho motor global do grupo esteve abaixo da média de referência, com desempenho motor axial inferior ao apendicular e importante discrepância entre esses. Recomenda-se atenção às habilidades motoras axiais e às oportunidades de exploração que o ambiente em creches pode propiciar, especialmente no decorrer dos dois primeiros anos de vida.OBJECTIVE: To analyze gross, fine and global motor performance and its correlation with neonatal and familial variables and day care exposure among children between 12-24 months of age attending public day care centers. METHODS: This

  11. Mezclas gasolina-etanol en motores de combustión interna en Colombia

    Directory of Open Access Journals (Sweden)

    Juan Mantilla

    2016-06-01

    Full Text Available En este trabajo se analiza el cambio sobre el desempeño y las emisiones de los motores encendidos por chispa cuando la gasolina es reemplazada por una mezcla de gasolina y etanol. Inicialmente se investiga la diferencia en las propiedades fisicoquímicas del combustible, y sus posibles efectos sobre el motor. Posteriormente se examina el efecto documentado del cambio de combustible en el desempeño y las emisiones del motor. Para llevar a cabo estos objetivos se realizó una revisión bibliográfica profunda de estos temas que sirve para proponer nuevas preguntas de acuerdo con el entorno colombiano. Los resultados de todos los puntos considerados indican que para que el cambio de combustible se convierta en una política efectiva, diferentes modificaciones deben realizarse al combustible y a los motores. Las inquietudes planteadas, junto con los resultados del análisis llevado a cabo, pueden utilizarse además como insumo para continuar con el desarrollo de trabajos de investigación e innovación tendientes a aprovechar el potencial del etanol como combustible.

  12. Indexación y posicionamiento de los repositorios en motores de búsqueda

    OpenAIRE

    Prieto Jiménez, Antonio Juan

    2015-01-01

    Taller presentat al XIV Workshop Rebiun de Poyectos Digitales / VI Jornadas OS-Repositorios (Córdoba, 11-13 de març de 2015) En el taller se exponen diversas utilidades, además de aspectos a tener en cuenta para la correcta indexación de los repositorio en motores de búsqueda generales y académicos haciendo especial referencia a los cambios desarrollados en DSpace en las últimas versiones para mejorar este aspecto. A la vez también se repasan conceptos válidos para cualquier repositorio c...

  13. Hereditary motor neuropathies and motor neuron diseases: which is which.

    Science.gov (United States)

    Hanemann, Clemens O; Ludolph, Albert C

    2002-12-01

    When Charcot first defined amyotrophic lateral sclerosis (ALS) he used the clinical and neuropathological pattern of vulnerability as a guideline. Similarly other motor neuron diseases such as the spinal muscular atrophies (SMA) and the motor neuropathies (MN) were grouped following clinical criteria. However, ever since the etiology of these diseases has started to be disclosed by genetics, we have learnt that the limits of the syndromes are not as well defined as our forefathers thought. A mutation leading to ALS can also be associated with the clinical picture of spinal muscular atrophy; even more unexpected is the overlap of the so-called motor neuropathies with the clinical syndrome of slowly progressive ALS or that primary lateral sclerosis (PLS) can be caused by the same gene as that responsible for some cases of ALS. In this review we summarise recent work showing that there is a considerable overlap between CMT, MN, SMA, ALS and PLS. Insights into these phenotypes should lead to study of the variants of motor neuron disease and possibly to a reclassification. This comprehensive review should help to improve understanding of the pathogenesis of motor neuron degeneration and finally may aid the research for urgently needed new treatment strategies, perhaps with validity for the entire group of motor neuron diseases.

  14. Avaliação da estimulação sensório-motora-oral na transição da alimentação enteral para a via oral plena em recém-nascidos pré-termo Evaluation of sensory-motor-oral stimulation in the transition from gastric tube to full oral feeding in preterm newborns

    Directory of Open Access Journals (Sweden)

    Magda Aline Bauer

    2009-12-01

    Full Text Available OBJETIVOS: avaliar a influência da estimulação sensório-motora-oral (SMO sobre o ganho de peso, tempo para realizar a transição da sonda para a via oral e, indiretamente, sobre a alta hospitalar de pré-termos. MÉTODOS: estudo de intervenção, do tipo ensaio clínico controlado, que incluiu 24 pré-termos, internados na UTI Neonatal do Hospital Universitário de Santa Maria, Rio Grande do Sul, Brasil, entre maio de 2007 e março de 2008, alocados, por sorteio, em grupo estimulado (GE e controle (GC. A análise das diferenças entre os grupos foi testada utilizando o teste t-Student independente e exato de Fisher (valor de pOBJECTIVES: to evaluate the influence of sensory-motor-oral (SMO stimulation on weight gain, the time taken to make the transition from tube-to oral feeding and, indirectly, on the duration of hospitalization of preterm infants. METHODS: a controlled clinical intervention study was carried out with 24 preterm infants hospitalized in the Neonatal ICU of the Santa Maria University Hospital in the State of Rio Grande do Sul, Brazil, between May 2007 and March 2008, divided randomly into a treatment (TG and control group (CG. The analysis of the differences between the groups was tested using Student's independent t-test and Fisher's exact test (with a p value <0.05. RESULTS: there was no statistical difference in terms of anthropometrical measurements, although the daily weight gain was higher in the TG (p=0.16. The TG group made a full transition from tube-to oral feeding on average 1.6 days earlier than the CG, 83.3% of the children in the TG making the transition within seven days, compared to only 38.9% of the control group. There was no difference in terms of the length of stay in hospital between the two groups (p=0.48. CONCLUSIONS: SMO stimulation was likely to lead to a swifter transition from tube-to oral feeding, without any adverse effect on weight gain in preterm newborns. No influence on the length of stay in

  15. The change in perceived motor competence and motor task values during elementary school : Gender and motor performance differences

    NARCIS (Netherlands)

    Noordstar, J.J.; van der Net, J.; Jak, S.; Helders, P.J.M.; Jongmans, M.J.

    2016-01-01

    Participation in motor activities is essential for social interaction and life satisfaction in children. Self-perceptions and task values have a central position in why children do or do not participate in (motor) activities. Investigating developmental changes in motor self-perceptions and motor

  16. 'Motor control center obsolescence'

    International Nuclear Information System (INIS)

    Irish, C.S.

    2003-01-01

    A significant and growing problem within the global nuclear industry is the aging of motor control center (MCC) components. MCC's have a very important role in the safety and critical to generation requirements of a nuclear power plant. Although many OEM's MCC's such as ITE/Telemechanique, GE, Westinghouse, Cutler Hammer, Klockner Moeller, etc. have been used throughout the global nuclear industry, they all have one common aspect obsolescence. Obsolescence of various components within the MCC's such as molded case circuit breakers, starters, relays, heaters, contactors, etc. are impacting the reliability of the MCC to serve its intended function. The paper will discuss the options which the nuclear industry is faced with to increase the reliability of the MCC's while maintaining design control, qualification and meeting budget constraints. The options as listed below shall be discussed in detail with examples to enhance the readers understanding of the situation: 1) Component by component replacement: The hurdles associated with trying to find equivalent components to replace the obsolete components while still worki (mechanically and electrically) in the original cubicle will be presented. 2) Complete MCC cubicle with new internal components replacement: The process of supplying a replacement cubicle, with all new internal components and new door to replace the original cubicle will be discussed. The presentation will conclude with a comparison of the advantages and dis-advantages of the two methods to bring the MCC to an as new condition with the overall goal of increasing reliability. (author)

  17. Methodology to monitor and diagnostic vibrations of the motor-pumps used in the primary cooling system of IEAR-1 nuclear research reactor; Metodologia para monitoracao e diagnostico de vibracao das bombas moto-operadas do circuito primario de refrigeracao do Reator IEA-R1

    Energy Technology Data Exchange (ETDEWEB)

    Benevenuti, Erion de Lima

    2004-07-01

    The objectives of this study are to establish a strategy to monitor and diagnose vibrations of the motor pumps used in the primary reactor cooling system of the IEA-R1 nuclear research reactor, to verify the possibility of using the existing installed monitoring vibration system and to implement such strategy in a continuous way. Four types of mechanical problems were considered: unbalancing, misalignment, gaps and faults in bearings. An adequate set of analysis tools, well established by the industry, was selected. These are: global measurements of vibration, velocity spectrum and acceleration envelope spectrum. Three sources of data and information were used; the data measured from the primary pumps, experimental results obtained with a Spectra Quest machine used to simulate mechanical defects and data from the literature. The results show that, for the specific case of the motor-pumps of IEA-R1 nuclear research reactor, although the technique using the envelope of acceleration, which is not available in the current system used to monitor the vibration of the motor pumps, is the one with best performance, the other techniques available in the system are sufficient to monitor the four types of mechanical problems mentioned. The proposed strategy is shown and detailed in this work. (author)

  18. Aberrant supplementary motor complex and limbic activity during motor preparation in motor conversion disorder.

    Science.gov (United States)

    Voon, Valerie; Brezing, Christina; Gallea, Cecile; Hallett, Mark

    2011-11-01

    Conversion disorder (CD) is characterized by unexplained neurological symptoms presumed related to psychological issues. The main hypotheses to explain conversion paralysis, characterized by a lack of movement, include impairments in either motor intention or disruption of motor execution, and further, that hyperactive self-monitoring, limbic processing or top-down regulation from higher order frontal regions may interfere with motor execution. We have recently shown that CD with positive abnormal or excessive motor symptoms was associated with greater amygdala activity to arousing stimuli along with greater functional connectivity between the amygdala and supplementary motor area. Here we studied patients with such symptoms focusing on motor initiation. Subjects performed either an internally or externally generated 2-button action selection task in a functional MRI study. Eleven CD patients without major depression and 11 age- and gender-matched normal volunteers were assessed. During both internally and externally generated movement, conversion disorder patients relative to normal volunteers had lower left supplementary motor area (SMA) (implicated in motor initiation) and higher right amygdala, left anterior insula, and bilateral posterior cingulate activity (implicated in assigning emotional salience). These findings were confirmed in a subgroup analysis of patients with tremor symptoms. During internally versus externally generated action in CD patients, the left SMA had lower functional connectivity with bilateral dorsolateral prefrontal cortices. We propose a theory in which previously mapped conversion motor representations may in an arousing context hijack the voluntary action selection system, which is both hypoactive and functionally disconnected from prefrontal top-down regulation. Copyright © 2011 Movement Disorder Society.

  19. Aberrant supplementary motor complex and limbic activity during motor preparation in motor conversion disorder

    Science.gov (United States)

    Voon, V; Brezing, C; Gallea, C; Hallett, M

    2014-01-01

    Background Conversion disorder is characterized by unexplained neurological symptoms presumed related to psychological issues. The main hypotheses to explain conversion paralysis, characterized by a lack of movement, include impairments in either motor intention or disruption of motor execution, and further, that hyperactive self-monitoring, limbic processing or top-down regulation from higher order frontal regions may interfere with motor execution. We have recently shown that conversion disorder with positive abnormal or excessive motor symptoms was associated with greater amygdala activity to arousing stimuli along with greater functional connectivity between the amgydala and supplementary motor area. Here we studied patients with such symptoms focusing on motor initiation. Methods Subjects performed either an internally or externally generated two-button action selection task in a functional MRI study. Results Eleven conversion disorder patients without major depression and 11 age- and gender-matched normal volunteers were assessed. During both internally and externally generated movement, conversion disorder patients relative to normal volunteers had lower left supplementary motor area (SMA) (implicated in motor initiation) and higher right amygdala, left anterior insula and bilateral posterior cingulate activity (implicated in assigning emotional salience). These findings were confirmed in a subgroup analysis of patients with tremor symptoms. During internally versus externally generated action in CD patients, the left SMA had lower functional connectivity with bilateral dorsolateral prefrontal cortices. Conclusion We propose a theory in which previously mapped conversion motor representations may in an arousing context hijack the voluntary action selection system which is both hypoactive and functionally disconnected from prefrontal top-down regulation. PMID:21935985

  20. Honda Motor Company's CVCC Engine

    Science.gov (United States)

    1980-01-01

    From 1968 to 1972, Honda Motor Co. of Japan designed, tested, and massproduced a stratified charge engine, the CVCC, which was lower in carbon monoxide, hydrocarbon, and nitrogen oxide emissions and higher in fuel economy than contemporary convention...

  1. Fault diagnosis of induction motors

    CERN Document Server

    Faiz, Jawad; Joksimović, Gojko

    2017-01-01

    This book is a comprehensive, structural approach to fault diagnosis strategy. The different fault types, signal processing techniques, and loss characterisation are addressed in the book. This is essential reading for work with induction motors for transportation and energy.

  2. 78 FR 66801 - Motor Carrier Safety Advisory Committee; Charter Renewal

    Science.gov (United States)

    2013-11-06

    ... DEPARTMENT OF TRANSPORTATION Federal Motor Carrier Safety Administration [Docket No. FMCSA-2006-26367] Motor Carrier Safety Advisory Committee; Charter Renewal AGENCY: Federal Motor Carrier Safety... and recommendations on motor carrier safety programs and motor carrier safety regulations through a...

  3. Electrical stimulation and motor recovery.

    Science.gov (United States)

    Young, Wise

    2015-01-01

    In recent years, several investigators have successfully regenerated axons in animal spinal cords without locomotor recovery. One explanation is that the animals were not trained to use the regenerated connections. Intensive locomotor training improves walking recovery after spinal cord injury (SCI) in people, and >90% of people with incomplete SCI recover walking with training. Although the optimal timing, duration, intensity, and type of locomotor training are still controversial, many investigators have reported beneficial effects of training on locomotor function. The mechanisms by which training improves recovery are not clear, but an attractive theory is available. In 1949, Donald Hebb proposed a famous rule that has been paraphrased as "neurons that fire together, wire together." This rule provided a theoretical basis for a widely accepted theory that homosynaptic and heterosynaptic activity facilitate synaptic formation and consolidation. In addition, the lumbar spinal cord has a locomotor center, called the central pattern generator (CPG), which can be activated nonspecifically with electrical stimulation or neurotransmitters to produce walking. The CPG is an obvious target to reconnect after SCI. Stimulating motor cortex, spinal cord, or peripheral nerves can modulate lumbar spinal cord excitability. Motor cortex stimulation causes long-term changes in spinal reflexes and synapses, increases sprouting of the corticospinal tract, and restores skilled forelimb function in rats. Long used to treat chronic pain, motor cortex stimuli modify lumbar spinal network excitability and improve lower extremity motor scores in humans. Similarly, epidural spinal cord stimulation has long been used to treat pain and spasticity. Subthreshold epidural stimulation reduces the threshold for locomotor activity. In 2011, Harkema et al. reported lumbosacral epidural stimulation restores motor control in chronic motor complete patients. Peripheral nerve or functional electrical

  4. Mathematical modeling of molecular motors

    OpenAIRE

    Keller, Peter

    2013-01-01

    Amongst the many complex processes taking place in living cells, transport of cargoes across the cytosceleton is fundamental to cell viability and activity. To move cargoes between the different cell parts, cells employ Molecular Motors. The motors operate by transporting cargoes along the so-called cellular micro-tubules, namely rope-like structures that connect, for instance, the cell-nucleus and outer membrane. We introduce a new Markov Chain, the killed Quasi-Random-Walk, for such transpo...

  5. Segmented rail linear induction motor

    Science.gov (United States)

    Cowan, Jr., Maynard; Marder, Barry M.

    1996-01-01

    A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces.

  6. Motor performance of preschool children

    OpenAIRE

    Karina Słonka; Manuela Dyas; Tadeusz Słonka; Tomasz Szurmik

    2017-01-01

    Introduction: Pre‑school age is a period of intensive development when children shape their posture, habits and motor memory. Movement is child's physiological need.  Motive activity supports not only physical development, but also psychical, intellectual and social.   Aim: The aim of the study is to assess motor ability in preschool children from the city of Opole and District Dobrzeń Wielki. Materials and methods: The research involved 228 children, aged 5 and 6. The method used in...

  7. Paliperidone-associated motor tics.

    Science.gov (United States)

    Hsieh, Ming-Han; Chiu, Nan-Ying

    2014-01-01

    Paliperidone-associated motor tics. Case report. We report a 30-year-old man with schizophrenia who developed motor tics (eye blinking) after treatment of paliperidone up to 15 mg daily. Tic-like symptoms, from simple eye blinking to complex Tourette-like syndrome, may occur during paliperidone treatment, especially with high dose. Crown Copyright © 2014. Published by Elsevier Inc. All rights reserved.

  8. High-speed AC motors

    Energy Technology Data Exchange (ETDEWEB)

    Jokinen, T.; Arkkio, A. [Helsinki University of Technology Laboratory of Electromechanics, Otaniemi (Finland)

    1997-12-31

    The paper deals with various types of highspeed electric motors, and their limiting powers. Standard machines with laminated rotors can be utilised if the speed is moderate. The solid rotor construction makes it possible to reach higher power and speed levels than those of laminated rotors. The development work on high-speed motors done at Helsinki University of Technology is presented, too. (orig.) 12 refs.

  9. Estrategias para negociaciones exitosas.

    OpenAIRE

    José B. Parra V; Evelinda Santiago J.; Misael Murillo M.; Candy Atonal N.

    2010-01-01

    Las estrategias de negociación son herramientas para disminuir conflictos o para intercambiar bienes y servicios. Una negociación exitosa crea relaciones de solidaridad y propicia reciprocidad, cooperación y confianza para quienes tendrán relaciones permanentes de negociación con beneficios para ambas partes. Una estrategia de negociación exitosa requiere manejar el desarrollo del ambiente social del grupo de personas, con la finalidad de tener presente las fronteras que no pueden irrumpirse....

  10. Electric motor for laser-mechanical drilling

    Science.gov (United States)

    Grubb, Daryl L.; Faircloth, Brian O.; Zediker, Mark S.

    2015-07-07

    A high power laser drilling system utilizing an electric motor laser bottom hole assembly. A high power laser beam travels within the electric motor for advancing a borehole. High power laser drilling system includes a down hole electrical motor having a hollow rotor for conveying a high power laser beam through the electrical motor.

  11. Electric motor for laser-mechanical drilling

    Science.gov (United States)

    Grubb, Daryl L.; Faircloth, Brian O.; Zediker, Mark S.

    2017-10-10

    A high power laser drilling system utilizing an electric motor laser bottom hole assembly. A high power laser beam travels within the electric motor for performing a laser operation. A system includes a down hole electrical motor having a hollow rotor for conveying a high power laser beam having a wavelength less than 1060 nm through the electrical motor.

  12. Rehabilitación de un motor de cuatro tiempos y elaboración de guías de laboratorío y de mantenimiento

    OpenAIRE

    Polit Chica, Javier; Barriga A, Alfredo

    2009-01-01

    Para empezar este proyecto y ejecutarlo tanto teóricamente como prácticamente, se necesitó rehabilitar el motor y ponerlo a punto, lo que involucró el cambio de algunas piezas que no estaban en funcionamiento y arreglo de otras que lo requerían. Una vez que logramos que el motor funcione perfectamente, se procedió a realizar las pruebas requeridas para poder concluir que el motor estaba funcionando bien, estas prueba involucraban el cambio de algunos parámetros como carga, número de revolucio...

  13. Control of non-conventional synchronous motors

    CERN Document Server

    Louis, Jean-Paul

    2013-01-01

    Classical synchronous motors are the most effective device to drive industrial production systems and robots with precision and rapidity. However, numerous applications require efficient controls in non-conventional situations. Firstly, this is the case with synchronous motors supplied by thyristor line-commutated inverters, or with synchronous motors with faults on one or several phases. Secondly, many drive systems use non-conventional motors such as polyphase (more than three phases) synchronous motors, synchronous motors with double excitation, permanent magnet linear synchronous motors,

  14. “Elaboración e implementación de una guía didáctica “ el motor del saber“ en base a técnicas activas de aprendizaje para fortalecer el proceso de enseñanza aprendizaje de octavo a décimo año en la asignatura de ciencias naturales de la escuela de educación básica " Tnte. Crnel. John merino b." El Tablón, del cantón Colta en el año lectivo 2013 - 2014”

    OpenAIRE

    Paguay Cacuango, Verónica Isabel

    2015-01-01

    De acuerdo al análisis realizado a los estudiantes verifiqué que tienen dificultad de aprendizaje porque no desarrollar la creatividad, criticidad, el razonamiento en Ciencias Naturales, por tal razón he sentido la necesidad de la “Elaboración e Implementación de una Guía Didáctica El Motor del Saber en base a Técnicas Activas de aprendizaje para fortalecer el proceso de enseñanza aprendizaje de octavo a décimo año en la asignatura de Ciencias Naturales de la Escuela de Educación Básica Tnt...

  15. Movement Sonification: Audiovisual benefits on motor learning

    Directory of Open Access Journals (Sweden)

    Weber Andreas

    2011-12-01

    Full Text Available Processes of motor control and learning in sports as well as in motor rehabilitation are based on perceptual functions and emergent motor representations. Here a new method of movement sonification is described which is designed to tune in more comprehensively the auditory system into motor perception to enhance motor learning. Usually silent features of the cyclic movement pattern "indoor rowing" are sonified in real time to make them additionally available to the auditory system when executing the movement. Via real time sonification movement perception can be enhanced in terms of temporal precision and multi-channel integration. But beside the contribution of a single perceptual channel to motor perception and motor representation also mechanisms of multisensory integration can be addressed, if movement sonification is configured adequately: Multimodal motor representations consisting of at least visual, auditory and proprioceptive components - can be shaped subtly resulting in more precise motor control and enhanced motor learning.

  16. The application of frequency converters and/or high efficiency motors in fans; Aplicacion de convertidores de frecuencia y/o motores de alta eficiencia en ventiladores

    Energy Technology Data Exchange (ETDEWEB)

    Delmar S, A. [Eficiencia Energetica, S.A. de C.V., Mexico, D. F. (Mexico)

    1995-12-31

    In this paper the characteristic curves of fans will be analyzed, some of the opportunities for energy conservation that can be applied and the precautions that have to be taken when a high efficiency motor is selected for this type of equipment. [Espanol] En este articulo se describiran las curvas caracteristicas de los ventiladores, algunas de las oportunidades de ahorro de energia que se pueden aplicar y las precauciones que hay que tomar cuando se seleccione un motor de alta eficiencia para estos equipos

  17. The application of frequency converters and/or high efficiency motors in fans; Aplicacion de convertidores de frecuencia y/o motores de alta eficiencia en ventiladores

    Energy Technology Data Exchange (ETDEWEB)

    Delmar S, A [Eficiencia Energetica, S.A. de C.V., Mexico, D. F. (Mexico)

    1996-12-31

    In this paper the characteristic curves of fans will be analyzed, some of the opportunities for energy conservation that can be applied and the precautions that have to be taken when a high efficiency motor is selected for this type of equipment. [Espanol] En este articulo se describiran las curvas caracteristicas de los ventiladores, algunas de las oportunidades de ahorro de energia que se pueden aplicar y las precauciones que hay que tomar cuando se seleccione un motor de alta eficiencia para estos equipos

  18. On-line monitoring for the detection and prevention of faults in the power transformers; Monitoreo en linea para la deteccion y prevencion de fallas en transformadores de potencia

    Energy Technology Data Exchange (ETDEWEB)

    Lopez Tagle, Alfredo; Equihua Tapia, Hugo [Comision Federal de Electricidad (Mexico); Linan Garcia, Roberto; Pascacio de los Santos, Alberth; Nunez Dominguez, Arturo [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    2000-07-01

    Power transformers are held to thermal, electrical and mechanical efforts, which degrade the isolation system oil/paper. So that to detect incipient degradations in transformers with more than 25 years of service installed in the transmission network of Commission Federal de Electricidad (CFE). The Instituto de Investigaciones Electricas (IIE), developed and installed six on-line Monitoring Systems for Power Transformers (SMLTP). The systems are installed at the substations Puebla II, banks AT-1 and AT-2, Malpaso II, bank, AT-1 and phase B of bank AT-1 of the electrical substation Villa de Garcia. [Spanish] Los transformadores de potencia estan sujetos a esfuerzos termicos, electricos y mecanicos, los cuales degradan el sistema de aislamiento aceite/papel. De modo que con el proposito de detectar degradaciones incipientes en transformadores con mas de 25 anos de servicio instalado en la red de transmision de la Comision Federal de Electricidad (CFE). El Instituto de Investigaciones Electricas (IIE), desarrollo e instalo seis Sistemas de Monitoreo en Linea para Transformadores de Potencia (SMLTP). Los sistemas se encuentran en las subestaciones Puebla II, bancos AT-1 y AT-2, Malpaso II, banco, AT-1 y fase B del banco AT-1 de la subestacion electrica Villa de Garcia.

  19. 41 CFR 102-34.85 - What motor vehicles require motor vehicle identification?

    Science.gov (United States)

    2010-07-01

    ... 41 Public Contracts and Property Management 3 2010-07-01 2010-07-01 false What motor vehicles require motor vehicle identification? 102-34.85 Section 102-34.85 Public Contracts and Property Management... 34-MOTOR VEHICLE MANAGEMENT Identifying and Registering Motor Vehicles Motor Vehicle Identification...

  20. Applications of superconductors to electric motors

    International Nuclear Information System (INIS)

    McConnell, B.W.

    1988-01-01

    This paper reviews previous experience in applying superconductors to electric motors and examines the difficulties encountered. While motors and generators have a common basis, several significant differences exist. The application of high temperature superconductors to the major electric motor types is discussed and expected difficulties are presented. The limitations imposed by various motor designs are reflected in a statement of the desired material properties for high temperature superconductor electric motor applications

  1. Space shuttle booster separation motor design

    Science.gov (United States)

    Smith, G. W.; Chase, C. A.

    1976-01-01

    The separation characteristics of the space shuttle solid rocket boosters (SRBs) are introduced along with the system level requirements for the booster separation motors (BSMs). These system requirements are then translated into specific motor requirements that control the design of the BSM. Each motor component is discussed including its geometry, material selection, and fabrication process. Also discussed is the propellant selection, grain design, and performance capabilities of the motor. The upcoming test program to develop and qualify the motor is outlined.

  2. Depressive symptoms and motor performance in the elderly: a population based study Sintomas depressivos e desempenho motor em idosos: estudo de base populacional

    Directory of Open Access Journals (Sweden)

    Kleyton T. Santos

    2012-08-01

    intervalo de confiança de 95%. RESULTADOS: Para todos os testes motores, o desempenho motor foi negativamente associado à sintomatologia depressiva, independentemente do sexo, idade, saber ler e escrever, renda familiar per capita e atividade física. Idosos com sintomas depressivos possuem entre 58% e 82% mais limitação funcional, a depender do teste de desempenho motor. CONCLUSÕES: Conclui-se que existe uma relação inversa entre sintomas depressivos e desempenho motor em idosos.

  3. Motor demand-dependent activation of ipsilateral motor cortex.

    Science.gov (United States)

    Buetefisch, Cathrin M; Revill, Kate Pirog; Shuster, Linda; Hines, Benjamin; Parsons, Michael

    2014-08-15

    The role of ipsilateral primary motor cortex (M1) in hand motor control during complex task performance remains controversial. Bilateral M1 activation is inconsistently observed in functional (f)MRI studies of unilateral hand performance. Two factors limit the interpretation of these data. As the motor tasks differ qualitatively in these studies, it is conceivable that M1 contributions differ with the demand on skillfulness. Second, most studies lack the verification of a strictly unilateral execution of the motor task during the acquisition of imaging data. Here, we use fMRI to determine whether ipsilateral M1 activity depends on the demand for precision in a pointing task where precision varied quantitatively while movement trajectories remained equal. Thirteen healthy participants used an MRI-compatible joystick to point to targets of four different sizes in a block design. A clustered acquisition technique allowed simultaneous fMRI/EMG data collection and confirmed that movements were strictly unilateral. Accuracy of performance increased with target size. Overall, the pointing task revealed activation in contralateral and ipsilateral M1, extending into contralateral somatosensory and parietal areas. Target size-dependent activation differences were found in ipsilateral M1 extending into the temporal/parietal junction, where activation increased with increasing demand on accuracy. The results suggest that ipsilateral M1 is active during the execution of a unilateral motor task and that its activity is modulated by the demand on precision. Copyright © 2014 the American Physiological Society.

  4. Changes of motor-cortical oscillations associated with motor learning.

    Science.gov (United States)

    Pollok, B; Latz, D; Krause, V; Butz, M; Schnitzler, A

    2014-09-05

    Motor learning results from practice but also between practice sessions. After skill acquisition early consolidation results in less interference with other motor tasks and even improved performance of the newly learned skill. A specific significance of the primary motor cortex (M1) for early consolidation has been suggested. Since synchronized oscillatory activity is assumed to facilitate neuronal plasticity, we here investigate alterations of motor-cortical oscillations by means of event-related desynchronization (ERD) at alpha (8-12 Hz) and beta (13-30 Hz) frequencies in healthy humans. Neuromagnetic activity was recorded using a 306-channel whole-head magnetoencephalography (MEG) system. ERD was investigated in 15 subjects during training on a serial reaction time task and 10 min after initial training. The data were compared with performance during a randomly varying sequence serving as control condition. The data reveal a stepwise decline of alpha-band ERD associated with faster reaction times replicating previous findings. The amount of beta-band suppression was significantly correlated with reduction of reaction times. While changes of alpha power have been related to lower cognitive control after initial skill acquisition, the present data suggest that the amount of beta suppression represents a neurophysiological marker of early cortical reorganization associated with motor learning. Copyright © 2014 IBRO. Published by Elsevier Ltd. All rights reserved.

  5. Subvenciones para instituciones Directrices para gastos de ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    IDRC CRDI

    División de Administración de Subvenciones ... En la Parte 2 del Acuerdo de Subvención estándar de IDRC se incluyen los límites ... pagar los costos de sustitución (tiempo libre para personal académico) de los investigadores principales.

  6. Submersible canned motor transfer pump

    International Nuclear Information System (INIS)

    Guardiani, R.F.; Pollick, R.D.; Nyilas, C.P.; Denmeade, T.J.

    1997-01-01

    A transfer pump is described which is used in a waste tank for transferring high-level radioactive liquid waste from a waste tank and having a column assembly, a canned electric motor means, and an impeller assembly with an upper impeller and a lower impeller connected to a shaft of a rotor assembly. The column assembly locates a motor housing with the electric motor means adjacent to the impeller assembly which creates an hydraulic head, and which forces the liquid waste, into the motor housing to cool the electric motor means and to cool and/or lubricate the radial and thrust bearing assemblies. Hard-on-hard bearing surfaces of the bearing assemblies and a ring assembly between the upper impeller and electric motor means grind large particles in the liquid waste flow. Slots in the static bearing member of the radial bearing assemblies further grind down the solid waste particles so that only particles smaller than the clearances in the system can pass there through, thereby resisting damage to and the interruption of the operation of the transfer pump. The column assembly is modular so that sections can be easily assembled, disassembled and/or removed. A second embodiment employs a stator jacket which provides an alternate means for cooling the electric motor means and lubricating and/or cooling the bearing assemblies, and a third embodiment employs a variable level suction device which allows liquid waste to be drawn into the transfer pump from varying and discrete levels in the waste tank. 17 figs

  7. Análisis y validación de varios mecanismos de cinética química por comparación con datos experimentales de un motor 2T de automoción y propuesta de un nuevo combustible de sustitución para la gasolina de 98 octanos

    OpenAIRE

    LLAMAZARES LÓPEZ, MARCOS

    2016-01-01

    [ES] Debido a la nueva legislación que regula las emisiones de óxidos de nitrógeno (NOx), el estudio de nuevas formas de controlar y reducir dichas emisiones ha adquirido una mayor importancia. El control de emisiones realizando post-tratamientos a los gases de escape tiene diversos inconvenientes, siendo los principales el elevado coste económico de los mismos y la necesidad de introducir nuevos elementos en el escape del motor dificultando el mantenimiento. Por ello, es de gr...

  8. Variability and practice load in motor learning. [Variabilidad y carga de práctica en el aprendizaje motor].

    Directory of Open Access Journals (Sweden)

    Francisco Javier Moreno

    2015-01-01

    Full Text Available Previous studies have pointed out the convenience of taking the characteristics of the skill to be learned and the intrinsic characteristics of the learners into account when designing practice tasks. Nevertheless, few studies have manipulated the amount of variable practice. The ability to adapt, as an inherent feature of biological systems, can be an adequate framework to explain and predict motor learning processes. This paper is based on adaption processes explained under the theory of allostasis and the general adaption syndrome and shares the background of the Dynamic Systems Theory, to propose the concept of practice load as a useful tool to quantify variability of practice in motor learning. From this standpoint, the conditions of variable practice are reviewed to be a stimulus in an adequate magnitude and direction to take the learner to a higher level of performance and hence to optimize motor learning. Resumen Muchos autores han recomendado la conveniencia de ajustar los niveles de práctica variable teniendo en cuenta las características de la tarea y la variabilidad intrínseca que muestra el aprendiz en la ejecución de la habilidad. Sin embargo, no son numerosos los trabajos que han manipulado varios niveles de cantidad de variabilidad al practicar. La capacidad de adaptación, como rasgo de los sistemas biológicos puede resultar un marco adecuado para afrontar esta cuestión. En este trabajo, apoyado en los procesos de adaptación explicados bajo las teorías de alostasis y el síndrome general de adaptación (GAS, y bajo presupuestos compartidos por la Teoría General de Sistemas Dinámicos, propondrá el concepto de carga de práctica como una herramienta para cuantificar la práctica en el aprendizaje motor. Bajo esta perspectiva se revisan las condiciones en las que la práctica en variabilidad debe modularse, para suponer una estimulación que facilite al aprendiz una adaptación a un nivel de rendimiento superior y con

  9. 77 FR 65765 - Petition for Exemption From the Federal Motor Vehicle Motor Theft Prevention Standard; General...

    Science.gov (United States)

    2012-10-30

    ... the vehicle. The antenna module translates the radio frequency signal received from the key into a... DEPARTMENT OF TRANSPORTATION National Highway Traffic Safety Administration Petition for Exemption From the Federal Motor Vehicle Motor Theft Prevention Standard; General Motors Corporation AGENCY...

  10. 77 FR 25534 - Petition for Exemption From the Federal Motor Vehicle Motor Theft Prevention Standard; General...

    Science.gov (United States)

    2012-04-30

    ... response back to the vehicle. The antenna module translates the radio frequency signal received from the... DEPARTMENT OF TRANSPORTATION National Highway Traffic Safety Administration Petition for Exemption From the Federal Motor Vehicle Motor Theft Prevention Standard; General Motors Corporation AGENCY...

  11. 75 FR 22317 - Federal Motor Vehicle Safety Standards; Small Business Impacts of Motor Vehicle Safety

    Science.gov (United States)

    2010-04-28

    ... 1300 [Docket No. NHTSA-2010-0054] Federal Motor Vehicle Safety Standards; Small Business Impacts of Motor Vehicle Safety AGENCY: National Highway Traffic Safety Administration (NHTSA), Department of..., multipurpose passenger vehicles, trucks, buses, trailers, incomplete vehicles, motorcycles, and motor vehicle...

  12. Comparison of Linear Induction Motor Theories for the LIMRV and TLRV Motors

    Science.gov (United States)

    1978-01-01

    The Oberretl, Yamamura, and Mosebach theories of the linear induction motor are described and also applied to predict performance characteristics of the TLRV & LIMRV linear induction motors. The effect of finite motor width and length on performance ...

  13. 46 CFR 169.684 - Overcurrent protection for motors and motor branch circuits.

    Science.gov (United States)

    2010-10-01

    ...) NAUTICAL SCHOOLS SAILING SCHOOL VESSELS Machinery and Electrical Electrical Installations Operating at... motor that is responsive to motor current or to both motor current and temperature may be used. (b) The...

  14. Evaluación del funcionamiento de motores de combustión interna trabajando con biodiesel. // Evaluation of engine performance working with biodiesel.

    OpenAIRE

    R. Piloto Rodríguez; R. Sierens; S. Verhelst; N. Ferrer Frontela

    2008-01-01

    En el presente trabajo se determinó la característica exterior de velocidad para dos motores de combustión internatrabajando con combustible biodiesel procedente de varias fuentes naturales y se comparó con la característica exterior develocidad de los motores originalmente trabajando con combustible diesel. Los motores fueron evaluados con variacionesde carga y velocidad. En uno de los motores ensayados fue determinada la presión en el interior de la cámara decombustión con el objetivo de ev...

  15. Economic and environmental advantages for the utilization of the industrial potential of cogeneration in Mexico; Ventajas economicas y ambientales para el aprovechamiento del potencial industrial de cogeneracion en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Leon de los Santos, G [Division de Estudios Posgrado, Facultad de ingenieria, Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    2003-01-15

    Mexico has an industrial cogeneration potential very important, not evaluated or projected within its historical growth. The objective of the present work consist of studying the industrial cogeneration potential that exists in Mexico, as well as the economic and environmental savings that it would be achieved if one took advantage of this potential. As a result of the present work we can conclude that the cogeneration in Mexico offers a theoretical potential middle of 28,000 MWe to the 2007. It is estimated an economic saving potential in the construction of generation infrastructure electrical, for the high stage of its utilization of almost 7000 million dollars and a stage of emissions reduction of 2007- 21.4%, instead of 2007- 0.35%, for the industrial sector of the country. Provided that change the vision of the government of seeing to the cogeneration as a measure of energy saving and substitute it by that of political of complement to the development of the national electrical sector. [Spanish] Mexico tiene un importante potencial de cogeneracion industrial que no ha sido evaluado ni proyectado dentro de su crecimiento historico, por ello, el objetito de este trabajo consiste en estudiar y conocer los ahorros economicos y ambientales que se podrian lograr si se aprovechara dicho potencial. Como resultado, se muestra que la cogeneracion en Mexico ofrece un potencial teorico medio de 28,000 MW e al ano 2007. Se estima tambien un ahorro economico en la construccion de infraestructura de generacion electrica para el escenario alto de su aprovechamiento de casi 7000 mdd, y un escenario de reduccion de emisiones para el sector industrial del pais de un 0.35% a un 21.47% para el ano 2007. Estos pronosticos se pueden lograr, siempre y cunado el gobierno cambie la vision de manejar este tema como una medida de ahorro de energia, y la sustituya por la politica de complemento al desarrollo del sector electrico nacional.

  16. Economic and environmental advantages for the use of the industrial potential of cogeneration in Mexico City; Ventajas economicas y ambientales para el aprovechamiento del potencial industrial de cogeneracion en Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Leon de los Santos, G. [Division de Estudios de Posgrado, Facultad de Ingenieria, UNAM, Mexico, D.F. (Mexico)

    2003-03-01

    Mexico has an industrial cogeneration potential very important, not evaluated or projected within its historical growth. The objective of the present work consist of studying the industrial cogeneration potential that exists in Mexico, as well as the economic and environmental savings that it would be achieved if one took advantage of this potential. As a result of the present work we can conclude that the cogeneration in Mexico offers a theoretical potential middle of 28,000 MWe to the 2007. It is estimated an economic saving potential in the construction of generation infrastructure electrical, for the high stage of its utilization of almost 7000 million of dollars and a stage of emissions reduction of 2007- 21.37% instead of 2007- 0.35% for the industrial sector of the country. These prognoses can be obtained, as long as the government changes vision to handle this subject as a measure of energy saving, and substitute it by the policy of complement the development of the national electrical sector. [Spanish] Mexico tiene un importante potencial de cogeneracion industrial que no ha sido evaluado ni proyectado dentro de su crecimiento historico, por ello, el objetivo de este trabajo consiste en estudiar y conocer los ahorros economicos y ambientales que se podrian lograr si se aprovechara dicho potencial. Como resultado, se muestra que la cogeneracion en Mexico ofrece un potencial teorico medio de 28,000 MWe al ano 2007. Se estima tambien un ahorro economico en la construccion de infraestructura de generacion electrica para el escenario alto de su aprovechamiento de casi 7 000 mdd, y un escenario de reduccion de emisiones para el sector industrial del pais de un 0.35% a un 21.4% para el ano 2007. Estos pronosticos se pueden lograr, siempre y cuando el gobierno cambie la vision de manejar este tema como una medida de ahorro de energia, y la sustituya por la politica de complemento al desarrollo del sector electrico nacional.

  17. Chemical processes of coal for use in power plants. Part 1: Approximate analysis and associated indexes of pulverized coal; Procesos quimicos del carbon para su uso en centrales termoelectricas. Parte 1: Analisis aproximado e indices asociados del carbon pulverizado

    Energy Technology Data Exchange (ETDEWEB)

    Altamirano-Bedolla, J. A.; Manzanares-Papayanopoulos, E.; Herrera-Velarde, J. R. [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)]. E-mail: emp@iie.org.mx

    2010-11-15

    The usage of hydrocarbons, such as natural gas, oil products and coal, will be the main source of energy to the mankind for next generations. Therefore, the actual research and technological developments point out to employ with high efficiency those fuels. The main interests are to release most of the energy as possible and to guide the combustion reactions. It is well known that during the combustion process of coal, the chemical energy is converted to thermal energy, which it allows the steam production, and therefore to produce energy through an electric generator. The main interest of the work presented here is to study the behavior of the coal combustion processes in function of the approximate analysis and some associate indices of that analysis, to point out the optimization of the coal usage as main fuel in electrical power generation plants. [Spanish] El uso de hidrocarburos como son el gas natural, los derivados del petroleo y el carbon mineral, continuara siendo en las proximas decadas la principal fuente de energia de la humanidad. Por consiguiente, la investigacion cientifica y los desarrollos tecnologicos actualmente se enfocan en emplear de manera mas eficiente dichos combustibles, satisfaciendo entre otros factores, dos intereses principales: liberar la mayor cantidad de energia, reduciendo al minimo el material combustible no quemado, y direccionar las reacciones del proceso de combustion para minimizar la cantidad de productos no deseados resultantes de la reaccion. A traves de los procesos quimicos de combustion del carbon, se transforma la energia quimica a energia termica, lo que permite la produccion de vapor para a su vez impulsar una turbina la cual esta acoplada a un generador electrico. El objetivo del presente trabajo es el estudio del comportamiento de los procesos quimicos que se llevan a cabo durante las reacciones de combus-tion del carbon en funcion del analisis aproximado y de los indices asociados resultantes de dicho analisis; lo

  18. APRENDIZAJE MOTOR Y SÍNDROME GENERAL DE ADAPTACIÓN

    Directory of Open Access Journals (Sweden)

    F. J. Moreno

    2010-09-01

    Full Text Available

     

    RESUMEN

    Este trabajo examina las posibilidades del Síndrome General de Adaptación como un marco de referencia para explicar y predecir los cambios producidos por el Aprendizaje Motor. Se parte de la consideración del ser humano como un sistema complejo en continua interacción con su entorno y el aprendizaje como un proceso de adaptación a las condiciones impuestas por la tarea. Se propone el concepto de carga de práctica análogo al de carga de entrenamiento, considerando que la práctica, vehículo del aprendizaje, debe aplicarse como una estimulación suficiente como para desencadenar en el aprendiz una adaptación a un nuevo nivel de rendimiento. En base a esta propuesta, se relacionan los principios del entrenamiento deportivo con el aprendizaje de habilidades motrices. Se formula una perspectiva teórica que trata de explicar de forma común los procesos de modificación de los patrones motores independientemente del nivel de complejidad, conllevando los mismos principios relacionados con la adaptación a una carga y aportando criterios para elaborar unos principios generales de actuación que deberían ayudar a diseñar las tareas de aprendizaje.
    Palabras Clave:Aprendizaje Motor, adaptación, sistemas complejos, entrenamiento, técnica.

     

    ABSTRACT

    This work examines the General Adaptation Syndrome like a suitable framework to explain motor learning processes. Human motor behaviour is viewed like a complex system continuously interacting in the environment. Motor learning is proposed as an adaptation process to the tasks constraints. Training loads and practice load are also considered analogous. Practice is the

  19. On line protection systems for induction motors

    International Nuclear Information System (INIS)

    Colak, I.; Celik, H.; Sefa, I.; Demirbas, S.

    2005-01-01

    Protection of induction motors is very important since they are widely used in industry for many applications due to their high robustness, reliability, low cost and maintenance, high efficiency and long service life. So, protecting these motors is crucial for operations. This paper presents a combined protection approach for induction motors. To achieve this, the electrical values of the induction motor were measured with sensitivity ±1% through a data acquisition card and processed with software developed in Visual C++. An on line protection system for induction motors was achieved easily and effectively. The experimental results have shown that the induction motor was protected against the possible problems faced during the operation. The software developed for this protection provides flexible and reliable media for operators and their motors. It is expected that the motor protection achieved in this study might be faster than the classical techniques and also may be applied to larger motors easily after small modifications of the software

  20. Mirror neurons and motor intentionality.

    Science.gov (United States)

    Rizzolatti, Giacomo; Sinigaglia, Corrado

    2007-01-01

    Our social life rests to a large extent on our ability to understand the intentions of others. What are the bases of this ability? A very influential view is that we understand the intentions of others because we are able to represent them as having mental states. Without this meta-representational (mind-reading) ability their behavior would be meaningless to us. Over the past few years this view has been challenged by neurophysiological findings and, in particular, by the discovery of mirror neurons. The functional properties of these neurons indicate that intentional understanding is based primarily on a mechanism that directly matches the sensory representation of the observed actions with one's own motor representation of those same actions. These findings reveal how deeply motor and intentional components of action are intertwined, suggesting that both can be fully comprehended only starting from a motor approach to intentionality.

  1. Induction Motors by Electric Measurements

    Directory of Open Access Journals (Sweden)

    Andrzej M. Trzynadlowski

    1999-01-01

    Full Text Available The paper gives an overview of the issues and means of detection of mechanical abnormalities in induction motors by electric measurements. If undetected and untreated, the worn or damaged bearings, rotor imbalance and eccentricity, broken bars of the rotor cage, and torsional and lateral vibration lead to roughly a half of all failures of induction motor drives. The detection of abnormalities is based on the fact that they cause periodic disturbance of motor variables, such as the speed, torque, current, and magnetic flux. Thus, spectral analysis of those or related quantities may yield a warning about an incipient failure of the drive system. Although the traditional non-invasive diagnostics has mostly been based on the signature analysis of the stator current, other media can also be employed. In particular, the partial instantaneous input power is shown, theoretically and experimentally, to offer distinct advantages under noisy operating conditions. Use of torque and flux estimates is also discussed.

  2. Linear Synchronous Motor Repeatability Tests

    International Nuclear Information System (INIS)

    Ward, C.R.

    2002-01-01

    A cart system using linear synchronous motors was being considered for the Plutonium Immobilization Plant (PIP). One of the applications in the PIP was the movement of a stack of furnace trays, filled with the waste form (pucks) from a stacking/unstacking station to several bottom loaded furnaces. A system was ordered to perform this function in the PIP Ceramic Prototype Test Facility (CPTF). This system was installed and started up in SRTC prior to being installed in the CPTF. The PIP was suspended and then canceled after the linear synchronous motor system was started up. This system was used to determine repeatability of a linear synchronous motor cart system for the Modern Pit Facility

  3. Conceptual design of stepper motor replacing servo motor for control rod controller

    International Nuclear Information System (INIS)

    Mohd Dzul Aiman Aslan; Mohd Idris Taib; Izhar Abu Hussin; Mohd Khairulezwan Abdul Manan; Mohd Sabri Minhat

    2010-01-01

    In PUSPATI TRIGA Reactor, current control rod controller are using servo motor to control the movement. Control rod is a very important safety element and measure in every nuclear reactor. So, precision is very important in measurement of security in the nuclear reactor. In this case, there are a few disadvantages when using the servo motor is measurement of the motor is not precise. One solution to overcome this is by shifting servo motor with stepper motor. A stepper motor (or step motor) is a brush less, synchronous electric motor that can divide a full rotation into a large number of steps. (author)

  4. Superconducting DC homopolar motors for ship propulsion

    Energy Technology Data Exchange (ETDEWEB)

    Heiberger, M.; Reed, M.R.; Creedon, W.P.; O' Hea, B.J. [General Atomic (United States)

    2000-07-01

    Superconducting DC homopolar motors have undergone recent advances in technology, warranting serious consideration of their use for ship propulsion. Homopolar motor propulsion is now practical because of two key technology developments: cryogen-free superconducting refrigeration and high performance motor fiber brushes. These compact motors are ideal for podded applications, where reduced drag and fuel consumption are predicted. In addition, the simple DC motor controller is more efficient and reliable compared with AC motor controllers. Military ships also benefit from increased stealth implicit in homopolar DC excitation, which also allows the option for direct hull or pod mounting. (authors)

  5. Homopolar motor with dual rotors

    Energy Technology Data Exchange (ETDEWEB)

    Hsu, J.S.

    1998-12-01

    A homopolar motor has a field rotor mounted on a frame for rotation in a first rotational direction and for producing an electromagnetic field, and an armature rotor mounted for rotation on said frame within said electromagnetic field and in a second rotational direction counter to said first rotational direction of said field rotor. The two rotors are coupled through a 1:1 gearing mechanism, so as to travel at the same speed but in opposite directions. This doubles the output voltage and output power, as compared to a motor in which only the armature is rotated. Several embodiments are disclosed. 7 figs.

  6. Homopolar motor with dual rotors

    Energy Technology Data Exchange (ETDEWEB)

    Hsu, John S. (Oak Ridge, TN)

    1998-01-01

    A homopolar motor (10) has a field rotor (15) mounted on a frame (11) for rotation in a first rotational direction and for producing an electromagnetic field, and an armature rotor (17) mounted for rotation on said frame (11) within said electromagnetic field and in a second rotational direction counter to said first rotational direction of said field rotor (15). The two rotors (15, 17) are coupled through a 1:1 gearing mechanism (19), so as to travel at the same speed but in opposite directions. This doubles the output voltage and output power, as compared to a motor in which only the armature is rotated. Several embodiments are disclosed.

  7. The Advanced Solid Rocket Motor

    Science.gov (United States)

    Mitchell, Royce E.

    1992-01-01

    The Advanced Solid Rocket Motor will utilize improved design features and automated manufacturing methods to produce an inherently safer propulsive system for the Space Shuttle and future launch systems. This second-generation motor will also provide an additional 12,000 pounds of payload to orbit, enhancing the utility and efficiency of the Shuttle system. The new plant will feature strip-wound, asbestos-free insulation; propellant continuous mixing and casting; and extensive robotic systems. Following a series of static tests at the Stennis Space Center, MS flights are targeted to begin in early 1997.

  8. Interference in ballistic motor learning - is motor interference really sensory?

    DEFF Research Database (Denmark)

    Lundbye-Jensen, Jesper; Petersen, Tue Hvass; Rothwell, John C

    Skill gained after a short period of practice in one motor task can be abolished if a second task is learned shortly afterwards. We hypothesised that interference requires the same circuits to be engaged in the two tasks and provoke competing processes of synaptic plasticity. To test this, subjects...

  9. To what extent does motor imagery resemble motor preparation?

    NARCIS (Netherlands)

    van der Lubbe, Rob; Sobierajewicz, Jagna; Jongsma, Marijtje; Przekoracka-Krawczyk, Anna

    2017-01-01

    Motor imagery may be defined as the generation of an image of the acting self that lacks the final execution of a movement. This image is thought to be a simulation of the intended action from a first-person perspective. Recent studies with a Go/NoGo version of the discrete sequence production

  10. Motor learning as a criterion for evaluating coordination motor abilities

    Directory of Open Access Journals (Sweden)

    Boraczynski Tomasz

    2011-10-01

    Full Text Available The aim of the study was to evaluate the ability of motor learning based on objective, metric criteria, in terms of pedagogical process aimed at improving the accuracy of hits a golf ball to the target. A group of 77 students of physical education participated in the study. Within 8 months there were performed 11 measurement sessions. In each session, subjects performed 10 hits a golf ball to the target from a distance of 9 m. Accuracy of hits was recorded. Effect of motor learning has been demonstrated in the progress of 10 consecutive hits a golf ball to the target in each session (operational control; in the dynamics of performance improvement between sessions (current control; as well as in the total result of eight-month experiment (stage control. There were developed norms for quantitative and qualitative assessment of accuracy of hits a golf ball to the target. Developed quantitative and qualitative criteria for assessing the speed of motor learning in various conditions of the educational process creates the possibility of organization the operational, current and stage control of the level of human coordination motor abilities, as required by leading process.

  11. La inteligencia emocional: una herramienta necesaria para el liderazgo. Concepto y componentes

    OpenAIRE

    Mart?nez Percy, Armando Martin

    2013-01-01

    La inteligencia emocional ser? la herramienta y/o recurso m?s importante del siglo XXI para sobrevivir a una ?poca de ?cambio permanente?. Es b?sica para incrementar el rendimiento profesional y el bienestar personal especialmente en profesiones complejas, como las que incluyen las relaciones personales como centro y principal motor de la actividad: educaci?n, recursos humanos, comunicaci?n, etc. Daniel Goleman (1995), conocido como el autor de la inteligencia emocional, arg...

  12. Coupling with concentric contact around motor shaft for line start synchronous motor

    Science.gov (United States)

    Melfi, Michael J.; Burdeshaw, Galen E.

    2017-10-03

    A method comprises providing a line-start synchronous motor. The motor has a stator, a rotor core disposed within the stator, and a motor shaft. In accordance with a step of the method, a coupling for coupling a load to the motor is provided. The coupling has a motor shaft attachment portion configured to provide substantially concentric contact around the shaft at the end of the motor shaft. The coupling has a load attachment portion configured to operatively connect to a load. In accordance with a step of the method, a load is coupled to the motor with the coupling, and driven from start to at least near synchronous speed during steady state operation of the motor with a load coupled thereto. The motor shaft attachment portion may comprise a bushing assembly with matching and opposed tapered surfaces that cooperate to secure the motor shaft attachment portion around the motor shaft.

  13. Motor cortex is required for learning but not for executing a motor skill.

    Science.gov (United States)

    Kawai, Risa; Markman, Timothy; Poddar, Rajesh; Ko, Raymond; Fantana, Antoniu L; Dhawale, Ashesh K; Kampff, Adam R; Ölveczky, Bence P

    2015-05-06

    Motor cortex is widely believed to underlie the acquisition and execution of motor skills, but its contributions to these processes are not fully understood. One reason is that studies on motor skills often conflate motor cortex's established role in dexterous control with roles in learning and producing task-specific motor sequences. To dissociate these aspects, we developed a motor task for rats that trains spatiotemporally precise movement patterns without requirements for dexterity. Remarkably, motor cortex lesions had no discernible effect on the acquired skills, which were expressed in their distinct pre-lesion forms on the very first day of post-lesion training. Motor cortex lesions prior to training, however, rendered rats unable to acquire the stereotyped motor sequences required for the task. These results suggest a remarkable capacity of subcortical motor circuits to execute learned skills and a previously unappreciated role for motor cortex in "tutoring" these circuits during learning. Copyright © 2015 Elsevier Inc. All rights reserved.

  14. Motor cortex is required for learning but not executing a motor skill

    Science.gov (United States)

    Kawai, Risa; Markman, Timothy; Poddar, Rajesh; Ko, Raymond; Fantana, Antoniu; Dhawale, Ashesh; Kampff, Adam R.; Ölveczky, Bence P.

    2018-01-01

    Motor cortex is widely believed to underlie the acquisition and execution of motor skills, yet its contributions to these processes are not fully understood. One reason is that studies on motor skills often conflate motor cortex’s established role in dexterous control with roles in learning and producing task-specific motor sequences. To dissociate these aspects, we developed a motor task for rats that trains spatiotemporally precise movement patterns without requirements for dexterity. Remarkably, motor cortex lesions had no discernible effect on the acquired skills, which were expressed in their distinct pre-lesion forms on the very first day of post-lesion training. Motor cortex lesions prior to training, however, rendered rats unable to acquire the stereotyped motor sequences required for the task. These results suggest a remarkable capacity of subcortical motor circuits to execute learned skills and a previously unappreciated role for motor cortex in ‘tutoring’ these circuits during learning. PMID:25892304

  15. Aversive stimuli exacerbate defensive motor behaviour in motor conversion disorder.

    Science.gov (United States)

    Blakemore, Rebekah L; Sinanaj, Indrit; Galli, Silvio; Aybek, Selma; Vuilleumier, Patrik

    2016-12-01

    Conversion disorder or functional neurological symptom disorder (FND) can affect the voluntary motor system, without an organic cause. Functional symptoms are thought to be generated unconsciously, arising from underlying psychological stressors. However, attempts to demonstrate a direct relationship between the limbic system and disrupted motor function in FND are lacking. We tested whether negative affect would exacerbate alterations of motor control and corresponding brain activations in individuals with FND. Ten patients and ten healthy controls produced an isometric precision-grip contraction at 10% of maximum force while either viewing visual feedback of their force output, or unpleasant or pleasant emotional images (without feedback). Force magnitude was continuously recorded together with change in brain activity using fMRI. For controls, force output decayed from the target level while viewing pleasant and unpleasant images. Patients however, maintained force at the target level without decay while viewing unpleasant images, indicating a pronounced effect of negative affect on force output in FND. This emotional modulation of force control was associated with different brain activation patterns between groups. Contrasting the unpleasant with the pleasant condition, controls showed increased activity in the inferior frontal cortex and pre-supplementary motor area, whereas patients had greater activity in the cerebellum (vermis), posterior cingulate cortex, and hippocampus. Engagement of a cerebellar-limbic network in patients is consistent with heightened processing of emotional salience, and supports the role of the cerebellum in freezing responses in the presence of aversive events. These data highlight a possible neural circuit through which psychological stressors elicit defensive behaviour and modulate motor function in FND. Copyright © 2016 Elsevier Ltd. All rights reserved.

  16. Oro para Colombia

    OpenAIRE

    Rubio Forero, María Claudia

    2016-01-01

    Las mujeres han debido atravesar un largo camino partiendo de la discriminación hasta empezar un proceso de equidad en la sociedad y en el deporte, de esta manera llegar a ser parte de un evento como los Juegos Olímpicos. Esta tesis toma el caso de tres atletas colombianas y describe su proceso de formación para lograr dos medallas de oro para el país.

  17. Aplicaciones del análisis de aceite usado en motores a diesel de uso marino

    OpenAIRE

    Muñoz, Carlos Neder; Marin Lopez, Jose Rolando

    2009-01-01

    El principal parámetro que determina la vida útil de un motor de combustión interna es el lu-bricante, el mismo que está compuesto usualmente de uno o dos tipos de aceites básico más un paquete de aditivos, para seleccionar un aceite de motor, se recomienda guiarse por el manual del fabricante de dicha máquina, en donde se indicará la viscosidad y el nivel de servicio o calidad que deberá tener el lubricante seleccionado. Dependerá de la correcta selección del lubricante que el desgaste de la...

  18. Motor alternativo : aplicación : sistema de locomoción ferroviario

    OpenAIRE

    Villaescusa Nistal, Jorge

    2009-01-01

    El siguiente proyecto consiste en el estudio y modelización del ciclo termodinámico de un motor diesel, cuya aplicación es la locomoción de unidades de ferrocarril. Una vez analizado dicho modelo se realizará un estudio sobre la posibilidad de efectuar mejoras sobre el mismo, con la finalidad de optimizar sus prestaciones. Para comenzar este estudio se realizará una descripción física del motor, utilizando los datos característicos que lo definen y en caso de no disponer de alguno de estos da...

  19. Modelo computacional del circuito motor basado en estudios de Resonancia Magnética Nuclear funcional

    OpenAIRE

    Karla Batista García-Ramó; Rafael Rodríguez-Rojas; Maylén Carballo-Barreda

    2012-01-01

    Los ganglios basales constituyen una compleja red de núcleos subcorticales implicados en el control motor,en la integración sensorimotora y en los procesos cognitivos. Su funcionamiento e interacción con el resto de las estructurascerebrales permanecen como una gran polémica. Este trabajo tuvo como objetivo modelar la interacción del circuito formado por los ganglios basales, el tálamo y la corteza para la selección de un programa motor, sobre la base del patrón de conectividad funcional ob...

  20. Estrategias para negociaciones exitosas.

    Directory of Open Access Journals (Sweden)

    José B. Parra V

    2010-01-01

    Full Text Available Las estrategias de negociación son herramientas para disminuir conflictos o para intercambiar bienes y servicios. Una negociación exitosa crea relaciones de solidaridad y propicia reciprocidad, cooperación y confianza para quienes tendrán relaciones permanentes de negociación con beneficios para ambas partes. Una estrategia de negociación exitosa requiere manejar el desarrollo del ambiente social del grupo de personas, con la finalidad de tener presente las fronteras que no pueden irrumpirse. Otro aspecto importante, es el lenguaje corporal utilizado por las personas y las tácticas que se practican. El manejo de esta información permite diseñar diferentes modelos de negociaciones para cada caso específico. Este documento propone la utilización de la herramienta MONACO, diseñada por los autores, que es un software útil para encontrar los mejores tácticas posibles dentro de una negociación; basándose en el lenguaje corporal que muestra el negociante oponente durante cada oferta monetaria. El uso de este software da al negociador la oportunidad de manejar las negociaciones con mayor control, el negociador que usa el software puede elegir una estrategia de acuerdo a las relaciones que espera mantener con el negociador oponente.

  1. ELECTRIC MOTORS FOR FARM USE.

    Science.gov (United States)

    Illinois Univ., Urbana. Coll. of Agriculture.

    BETWEEN 2 AND 8 HOURS ARE REQUIRED FOR USE OF THIS TEXTUAL OR REFERENCE MATERIAL ON ELECTRIC MOTORS. IT WAS DEVELOPED BY AN AGRICULTURAL EDUCATION-AGRICULTURAL ENGINEERING SPECIALIST ON THE BASIS OF CONFERENCES WITH SUBJECT MATTER SPECIALISTS, TEACHER EDUCATORS, SUPERVISORS, AND TEACHERS. THE OBJECTIVES AND SUBJECT MATTER CENTER AROUND THE…

  2. Imaging the ocular motor nerves.

    NARCIS (Netherlands)

    Ferreira, T.; Verbist, B.M.; Buchem, M. van; Osch, T. van; Webb, A.

    2010-01-01

    The ocular motor nerves (OMNs) comprise the oculomotor, trochlear and the abducens nerves. According to their course, they are divided into four or five anatomic segments: intra-axial, cisternal, cavernous and intra-orbital and, for the abducens nerve, an additional interdural segment. Magnetic

  3. Linear Motor With Air Slide

    Science.gov (United States)

    Johnson, Bruce G.; Gerver, Michael J.; Hawkey, Timothy J.; Fenn, Ralph C.

    1993-01-01

    Improved linear actuator comprises air slide and linear electric motor. Unit exhibits low friction, low backlash, and more nearly even acceleration. Used in machinery in which positions, velocities, and accelerations must be carefully controlled and/or vibrations must be suppressed.

  4. Technology and Motor Ability Development

    Science.gov (United States)

    Wang, Lin; Lang, Yong; Luo, Zhongmin

    2014-01-01

    As a new member joining the technology family, active video games have been developed to promote physical exercise. This working-in-progress paper shares an ongoing project on examining the basic motor abilities that are enhanced through participating in commercially available active video games. [For the full proceedings see ED557181.

  5. Motor Skill Learning in Children.

    Science.gov (United States)

    Gabbard, Carl P.

    The purpose of this article is to briefly describe schema theory and indicate its relevance to early childhood development, with specific reference to children's acquisition of motor skills. Schema theory proposes an explanation of how individuals learn and perform a seemingly endless variety of movements. According to Schmidt (1975), goal…

  6. Shape memory alloy based motor

    Indian Academy of Sciences (India)

    1989a,b) that SMA spring or strip generates force as a non-linear function of its deformed length. ... magnetic property, smooth, jerk free operation and insensitivity to space radiations namely, electrons, protons ..... will be 1 Amp DC. The motor ...

  7. Treatment of functional motor disorders

    NARCIS (Netherlands)

    Gelauff, Jeannette M.; Dreissen, Yasmine E. M.; Tijssen, Marina A. J.; Stone, Jon

    OPINION STATEMENT: For the treatment of functional motor disorder, we recommend a three-stage approach. Firstly, patients must be assessed and given an unambiguous diagnosis, with an explanation that helps them understand that they have a genuine disorder, with the potential for reversibility. A key

  8. Motor Action and Emotional Memory

    Science.gov (United States)

    Casasanto, Daniel; Dijkstra, Katinka

    2010-01-01

    Can simple motor actions affect how efficiently people retrieve emotional memories, and influence what they choose to remember? In Experiment 1, participants were prompted to retell autobiographical memories with either positive or negative valence, while moving marbles either upward or downward. They retrieved memories faster when the direction…

  9. Magnetic Signature of Brushless Electric Motors

    National Research Council Canada - National Science Library

    Clarke, David

    2006-01-01

    Brushless electric motors are used in a number of underwater vehicles. When these underwater vehicles are used for mine clearance operations the magnetic signature of the brushless motors is important...

  10. Improving commercial motor vehicle safety in Oregon.

    Science.gov (United States)

    2010-08-01

    This study addressed the primary functions of the Oregon Department of Transportations (ODOTs) Motor Carrier Safety Assistance Program (MCSAP), which is administered by the Motor Carrier Transportation Division (MCTD). The study first documente...

  11. Energy Optimal Control of Induction Motor Drives

    DEFF Research Database (Denmark)

    Abrahamsen, Flemming

    This thesis deals with energy optimal control of small and medium-size variable speed induction motor drives for especially Heating, Ventilation and Air-Condition (HVAC) applications. Optimized efficiency is achieved by adapting the magnetization level in the motor to the load, and the basic...... demonstrated that energy optimal control will sometimes improve and sometimes deteriorate the stability. Comparison of small and medium-size induction motor drives with permanent magnet motor drives indicated why, and in which applications, PM motors are especially good. Calculations of economical aspects...... improvement by energy optimal control for any standard induction motor drive between 2.2 kW and 90 kW. A simple method to evaluate the robustness against load disturbances was developed and used to compare the robustness of different motor types and sizes. Calculation of the oscillatory behavior of a motor...

  12. Experimental thermodynamics of single molecular motor.

    Science.gov (United States)

    Toyabe, Shoichi; Muneyuki, Eiro

    2013-01-01

    Molecular motor is a nano-sized chemical engine that converts chemical free energy to mechanical motions. Hence, the energetics is as important as kinetics in order to understand its operation principle. We review experiments to evaluate the thermodynamic properties of a rotational F1-ATPase motor (F1-motor) at a single-molecule level. We show that the F1-motor achieves 100% thermo dynamic efficiency at the stalled state. Furthermore, the motor reduces the internal irreversible heat inside the motor to almost zero and achieves a highly-efficient free energy transduction close to 100% during rotations far from quasistatic process. We discuss the mechanism of how the F1-motor achieves such a high efficiency, which highlights the remarkable property of the nano-sized engine F1-motor.

  13. Motor Vehicle Crash Injuries PSA (:60)

    Centers for Disease Control (CDC) Podcasts

    This 60 second Public Service Announcement is based on the October 2014 CDC Vital Signs report. Motor vehicle crashes are costly and preventable. Learn what can be done to help prevent motor vehicle injuries.

  14. Optimization analysis of propulsion motor control efficiency

    Directory of Open Access Journals (Sweden)

    CAI Qingnan

    2017-12-01

    Full Text Available [Objectives] This paper aims to strengthen the control effect of propulsion motors and decrease the energy used during actual control procedures.[Methods] Based on the traditional propulsion motor equivalence circuit, we increase the iron loss current component, introduce the definition of power matching ratio, calculate the highest efficiency of a motor at a given speed and discuss the flux corresponding to the power matching ratio with the highest efficiency. In the original motor vector efficiency optimization control module, an efficiency optimization control module is added so as to achieve motor efficiency optimization and energy conservation.[Results] MATLAB/Simulink simulation data shows that the efficiency optimization control method is suitable for most conditions. The operation efficiency of the improved motor model is significantly higher than that of the original motor model, and its dynamic performance is good.[Conclusions] Our motor efficiency optimization control method can be applied in engineering to achieve energy conservation.

  15. How to make spinal motor neurons.

    Science.gov (United States)

    Davis-Dusenbery, Brandi N; Williams, Luis A; Klim, Joseph R; Eggan, Kevin

    2014-02-01

    All muscle movements, including breathing, walking, and fine motor skills rely on the function of the spinal motor neuron to transmit signals from the brain to individual muscle groups. Loss of spinal motor neuron function underlies several neurological disorders for which treatment has been hampered by the inability to obtain sufficient quantities of primary motor neurons to perform mechanistic studies or drug screens. Progress towards overcoming this challenge has been achieved through the synthesis of developmental biology paradigms and advances in stem cell and reprogramming technology, which allow the production of motor neurons in vitro. In this Primer, we discuss how the logic of spinal motor neuron development has been applied to allow generation of motor neurons either from pluripotent stem cells by directed differentiation and transcriptional programming, or from somatic cells by direct lineage conversion. Finally, we discuss methods to evaluate the molecular and functional properties of motor neurons generated through each of these techniques.

  16. Ultrasonic Linear Motor with Two Independent Vibrations

    Science.gov (United States)

    Muneishi, Takeshi; Tomikawa, Yoshiro

    2004-09-01

    We propose a new structure of an ultrasonic linear motor in order to solve the problems of high-power ultrasonic linear motors that drive the XY-stage for electron beam equipment and to expand the application fields of the motor. We pay special attention to the following three points: (1) the vibration in two directions of the ultrasonic linear motor should not influence mutually each other, (2) the vibration in two directions should be divided into the stage traveling direction and the pressing direction of the ultrasonic linear motor, and (3) the rigidity of the stage traveling direction of the ultrasonic linear motor should be increased. As a result, the supporting method of ultrasonic linear motors is simplified. The efficiency of the motor is improved and temperature rise is reduced. The stage position drift is also improved.

  17. Ventajas de los motores de flujo axial

    Directory of Open Access Journals (Sweden)

    Alberto M Basanta Otero

    2011-03-01

    Full Text Available Es importante conocer sobre una familia de motores que a diferencia de los convencionales o tradicionales no presentanun flujo rotatorio radial, denominados motores de flujo axial. Dichos motores presentan altos valores de par motriz abajas velocidades, una alta eficiencia y alta densidad de potencia. Este trabajo constituye un breve análisis dealgunos motores de la referencia bibliográfica.  Is important to know about a family of motors that at difference whit the traditional, don't have a rotator radial flux,called, axial flux motors. These motors have high torque for low speed, high efficiency and high power density. Thiswork is a brief analysis of several motors of the bibliographic references.

  18. Moxidectin interference on motor activity of rats

    Directory of Open Access Journals (Sweden)

    Patrícia de Sá e Benevides Rodrigues-Alves

    2009-08-01

    Full Text Available The present study investigated the effects of t moxidectin (MXD in some parameters of rat motor function and neurochemical. The general activity in the open field and the motor coordination in the wooden beam were employed to evaluate the MXD effects. The results showed that, in the open field, even at high doses (2.0 and 20.0 mg/kg, the MXD did not alter the locomotion and the rearing frequencies. However, MXD was able to impair the motor coordination of the animals at wooden beam. Neurochemical studies of striatal GABA and dopamine neurotransmitters showed a reduced levels of dopamine and its metabolite, homovanillic acid, without interference on striatal GABA levels. Since GABAergic receptor stimulation had an inhibitory effect on dopaminergic striatal system, the decreased motor coordination could be attributed to an action of MXD on dopamine system via GABA activation.A moxidectina (MXD é uma droga antiparasitária amplamente empregada em animais domésticos; seu mecanismo de ação, em mamíferos, envolve o neurotransmissor ácido gama-aminobutírico (GABA. Esse neurotransmissor tem papel importante na função motora. Assim, no presente trabalho estudaram-se os efeitos da MXD em alguns parâmetros comportamentais ligados a função motora de ratos e também em sistemas de neurotransmissão central. A atividade geral no campo aberto e a coordenação motora na trave elevada foram empregadas para avaliar os efeitos de diferentes doses de MXD. Os resultados mostraram que: no campo aberto, mesmo as doses maiores (2.0 e 20.0 mg/kg de MXD não alteraram as freqüências de locomoção e levantar. Por outro lado, a MXD foi capaz de prejudicar a coordenação motora dos animais avaliada na trave elevada. Estudos neuroquímicos dos níveis estriatais de GABA e dopamina mostraram redução dos níveis de dopamina e seu metabólito, ácido homavanílico, sem interferência nos níveis de GABA estriatal. Considerando que a estimulação de

  19. The micro-step motor controller

    International Nuclear Information System (INIS)

    Hong, Kwang Pyo; Lee, Chang Hee; Moon, Myung Kook; Choi, Bung Hun; Choi, Young Hyun; Cheon, Jong Gu

    2004-11-01

    The developed micro-step motor controller can handle 4 axes stepping motor drivers simultaneously and provide high power bipolar driving mechanism with constant current mode. It can be easily controlled by manual key functions and the motor driving status is displayed by the front panel VFD. Due to the development of several kinds of communication and driving protocol, PC can operate even several micro-step motor controllers at once by multi-drop connection

  20. High-Tc superconducting electric motors

    International Nuclear Information System (INIS)

    Schiferl, R.; Stein, J.

    1992-01-01

    In this paper, the advantages and limitations of using superconductors in motors are discussed. A synchronous motor with a high temperature superconducting field winding for pump and fan drive applications is described and some of its unique design features are identified. A 10,000 horsepower superconducting motor design is presented. The critical field and current density requirements for high temperature superconducting wire in motors is discussed. Finally, recent progress in superconducting wire performance is presented

  1. Frequency modulation drive for a piezoelectric motor

    Science.gov (United States)

    Mittas, Anthony

    2001-01-01

    A piezoelectric motor has peak performance at a specific frequency f.sub.1 that may vary over a range of frequencies. A drive system is disclosed for operating such a motor at peak performance without feedback. The drive system consists of the motor and an ac source connected to power the motor, the ac source repeatedly generating a frequency over a range from f.sub.1 -.DELTA.x to f.sub.1 +.DELTA.y.

  2. Some simple demonstration experiments involving homopolar motors

    OpenAIRE

    Stewart, Seán M.

    2007-01-01

    The ready availability of very strong permanent magnets in the form of rare-earth magnetic alloys such as neodymium-iron-boron has lead to renewed interest in one of the oldest types of electric motors - the homopolar motor. The ease with which a demonstration homopolar motor can now be built and operated when neodymium magnets are used is quite remarkable. In this paper some simple homopolar motors employing neodymium magnets suitable for demonstrational purposes are described and discussed....

  3. Some simple demonstration experiments involving homopolar motors

    OpenAIRE

    Stewart,Seán M.

    2007-01-01

    The ready availability of very strong permanent magnets in the form of rare-earth magnetic alloys such as neodymium-iron-boron has lead to renewed interest in one of the oldest types of electric motors - the homopolar motor. The ease with which a demonstration homopolar motor can now be built and operated when neodymium magnets are used is quite remarkable. In this paper some simple homopolar motors employing neodymium magnets suitable for demonstrational purposes are described and discussed.

  4. Physical mechanisms of biological molecular motors

    Energy Technology Data Exchange (ETDEWEB)

    Miller, John H. Jr. [Department of Physics and Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Ste. 617 SR1 Houston, TX 77204-5005 (United States)], E-mail: jhmiller@uh.edu; Vajrala, Vijayanand; Infante, Hans L. [Department of Physics and Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Ste. 617 SR1 Houston, TX 77204-5005 (United States); Claycomb, James R. [Department of Physics and Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Ste. 617 SR1 Houston, TX 77204-5005 (United States); Department of Mathematics and Physics, Houston Baptist University, 7502 Fondren Road, Houston, TX 77074-3298 (United States); Palanisami, Akilan; Fang Jie; Mercier, George T. [Department of Physics and Texas Center for Superconductivity, University of Houston, 4800 Calhoun Road, Ste. 617 SR1 Houston, TX 77204-5005 (United States)

    2009-03-01

    Biological motors generally fall into two categories: (1) those that convert chemical into mechanical energy via hydrolysis of a nucleoside triphosphate, usually adenosine triphosphate, regarded as life's chemical currency of energy and (2) membrane bound motors driven directly by an ion gradient and/or membrane potential. Here we argue that electrostatic interactions play a vital role for both types of motors and, therefore, the tools of physics can greatly contribute to understanding biological motors.

  5. Physical mechanisms of biological molecular motors

    International Nuclear Information System (INIS)

    Miller, John H. Jr.; Vajrala, Vijayanand; Infante, Hans L.; Claycomb, James R.; Palanisami, Akilan; Fang Jie; Mercier, George T.

    2009-01-01

    Biological motors generally fall into two categories: (1) those that convert chemical into mechanical energy via hydrolysis of a nucleoside triphosphate, usually adenosine triphosphate, regarded as life's chemical currency of energy and (2) membrane bound motors driven directly by an ion gradient and/or membrane potential. Here we argue that electrostatic interactions play a vital role for both types of motors and, therefore, the tools of physics can greatly contribute to understanding biological motors

  6. FUZZY LOGIC CONTROL OF ELECTRIC MOTORS AND MOTOR DRIVES: FEASIBILITY STUDY

    Science.gov (United States)

    The report gives results of a study (part 1) of fuzzy logic motor control (FLMC). The study included: 1) reviews of existing applications of fuzzy logic, of motor operation, and of motor control; 2) a description of motor control schemes that can utilize FLMC; 3) selection of a m...

  7. Het motorrijwiel : handboek voor motor- en scooterrijders, motor- en scootermonteurs en -technici

    NARCIS (Netherlands)

    Seyffardt, A.L.W.

    1961-01-01

    INHOUD: 1. De werking van de motor ; 2. De hoofddelen van de motor ; 3. De kleppen en de klepbeweging ; 4. Balancering, de meercilinder motor ; 5. Bijzonderheden over de werking ; 6. De carburateur ; 7. De smering van de motor ; 8. De tweetaktmotor ; 9. De elektrische installatie ; 10. De

  8. The influence of motor imagery on the learning of a fine hand motor skill

    NARCIS (Netherlands)

    Sobierajewicz, Jagna; Przekoracka-Krawczyk, Anna; Jaśkowski, Wojciech; Verwey, Willem B.; van der Lubbe, Rob

    2017-01-01

    Motor imagery has been argued to affect the acquisition of motor skills. The present study examined the specificity of motor imagery on the learning of a fine hand motor skill by employing a modified discrete sequence production task: the Go/NoGo DSP task. After an informative cue, a response

  9. 76 FR 12792 - Petition for Exemption From the Federal Motor Vehicle Motor Theft Prevention Standard; General...

    Science.gov (United States)

    2011-03-08

    ... From the Federal Motor Vehicle Motor Theft Prevention Standard; General Motors Corporation AGENCY..., Exemption from the Theft Prevention Standard. This petition is granted because the agency has determined... in reducing and deterring motor vehicle theft as compliance with the parts-marking requirements of...

  10. 77 FR 22383 - Petition for Exemption From the Federal Motor Vehicle Motor Theft Prevention Standard; TESLA

    Science.gov (United States)

    2012-04-13

    ... From the Federal Motor Vehicle Motor Theft Prevention Standard; TESLA AGENCY: National Highway Traffic... exemption. SUMMARY: This document grants in full the petition of Tesla Motors Inc's. (Tesla) for an... 49 CFR Part 541, Federal Motor Vehicle Theft Prevention Standard. Tesla requested confidential...

  11. Neuronal mechanisms of motor learning and motor memory consolidation in healthy old adults

    NARCIS (Netherlands)

    Berghuis, K. M. M.; Veldman, M. P.; Solnik, S.; Koch, G.; Zijdewind, I.; Hortobagyi, T.

    It is controversial whether or not old adults are capable of learning new motor skills and consolidate the performance gains into motor memory in the offline period. The underlying neuronal mechanisms are equally unclear. We determined the magnitude of motor learning and motor memory consolidation

  12. Assessment of Preschoolers' Gross Motor Proficiency: Revisiting Bruininks-Oseretsky Test of Motor Proficiency

    Science.gov (United States)

    Lam, Hazel Mei Yung

    2011-01-01

    Literature reveals that there are very few validated motor proficiency tests for young children. According to Gallahue and Ozmun, the Bruininks-Oseretsky Test of Motor Proficiency is a valid test. However, manipulative skills, which are classified as gross motor skills by most motor development specialists, are only tested in the Upper Limb…

  13. Motor Programming in Apraxia of Speech

    Science.gov (United States)

    Maas, Edwin; Robin, Donald A.; Wright, David L.; Ballard, Kirrie J.

    2008-01-01

    Apraxia of Speech (AOS) is an impairment of motor programming. However, the exact nature of this deficit remains unclear. The present study examined motor programming in AOS in the context of a recent two-stage model [Klapp, S. T. (1995). Motor response programming during simple and choice reaction time: The role of practice. "Journal of…

  14. Agricultural Electricity. Electric Motors. Student Manual.

    Science.gov (United States)

    Benson, Robert T.

    Addressed to the student, this manual, which includes supplementary diagrams, discusses the following topics and principles: Electromagnetic fields, electromagnets, parts of an electric motor, determining speed of an electric motor, types of electric motors in common use (split-phase, capacitor, repulsion-induction, three-phase), the electric…

  15. Control of a superconducting synchronous motor

    Energy Technology Data Exchange (ETDEWEB)

    Jiang, Y; Pei, R; Jiang, Q; Hong, Z; Coombs, T A [Engineering Department, Cambridge University, Trumpington Street, Cambridge CB2 1PZ (United Kingdom)

    2007-04-15

    This paper presents a control algorithm for starting up a high temperature superconducting synchronous motor. The mathematical model of the motor has been established in m-file in Matlab and the parameters have been identified by means of the finite-element analysis method. Different starting methods for the motor have been compared and discussed, and eventually a hybrid control algorithm is proposed.

  16. Motor Development Programming in Trisomic-21 Babies

    Science.gov (United States)

    Sanz, Teresa; Menendez, Javier; Rosique, Teresa

    2011-01-01

    The present study contributes to the understanding of gross motor development in babies with Down's syndrome. Also, it facilitates the comprehension of the efficiency of the early motor stimulation as well as of beginning it as early as possible. We worked with two groups of babies with Down's syndrome, beginning the early motor training in each…

  17. Electric Motor Thermal Management R&D

    Energy Technology Data Exchange (ETDEWEB)

    Bennion, Kevin

    2016-06-07

    Thermal management enables more efficient and cost-effective motors. This Annual Merit Review presentation describes the technical accomplishments and progress in electric motor thermal management R&D over the last year. This project supports a broad industry demand for data, analysis methods, and experimental techniques to improve and better understand motor thermal management.

  18. [Non-motor symptoms of Parkinson's disease

    NARCIS (Netherlands)

    Weerkamp, N.J.; Nijhof, A.; Tissingh, G.

    2012-01-01

    Parkinson's disease has traditionally been viewed as a disease with only motor features. Nowadays, a wide variety of non-motor symptoms and signs are also recognised as being characteristic of the disease. Non-motor symptoms, most importantly autonomic dysfunction, neuropsychiatric symptoms and

  19. Motor performance in children with Noonan syndrome

    NARCIS (Netherlands)

    Croonen, E.A.; Essink, M.; Burgt, I. van der; Draaisma, J.M.; Noordam, C.; Nijhuis-Van der Sanden, M.W.G.

    2017-01-01

    Although problems with motor performance in daily life are frequently mentioned in Noonan syndrome, the motor performance profile has never been systematically investigated. The aim of this study was to examine whether a specific profile in motor performance in children with Noonan syndrome was seen

  20. 33 CFR 127.1311 - Motor vehicles.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Motor vehicles. 127.1311 Section... Waterfront Facilities Handling Liquefied Hazardous Gas Operations § 127.1311 Motor vehicles. (a) When LHG is... operator shall ensure that no person— (1) Stops or parks a motor vehicle in a space other than a designated...

  1. 33 CFR 159.69 - Motor ratings.

    Science.gov (United States)

    2010-07-01

    ... 33 Navigation and Navigable Waters 2 2010-07-01 2010-07-01 false Motor ratings. 159.69 Section 159.69 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) POLLUTION MARINE SANITATION DEVICES Design, Construction, and Testing § 159.69 Motor ratings. Motors must be rated...

  2. 47 CFR 32.2112 - Motor vehicles.

    Science.gov (United States)

    2010-10-01

    ... 47 Telecommunication 2 2010-10-01 2010-10-01 false Motor vehicles. 32.2112 Section 32.2112... FOR TELECOMMUNICATIONS COMPANIES Instructions for Balance Sheet Accounts § 32.2112 Motor vehicles. This account shall include the original cost of motor vehicles of the type which are designed and...

  3. 76 FR 32390 - Motor Carrier Safety Advisory Committee Public Meeting

    Science.gov (United States)

    2011-06-06

    ... DEPARTMENT OF TRANSPORTATION Federal Motor Carrier Safety Administration [Docket No. FMCSA-2006-26367] Motor Carrier Safety Advisory Committee Public Meeting AGENCY: Federal Motor Carrier Safety Administration (FMCSA), DOT. ACTION: Notice of Motor Carrier Safety Advisory Committee (MCSAC) Meeting. SUMMARY...

  4. 77 FR 46555 - Motor Carrier Safety Advisory Committee: Public Meeting

    Science.gov (United States)

    2012-08-03

    ... DEPARTMENT OF TRANSPORTATION Federal Motor Carrier Safety Administration [Docket No. FMCSA-2006-26367] Motor Carrier Safety Advisory Committee: Public Meeting AGENCY: Federal Motor Carrier Safety Administration (FMCSA), DOT. ACTION: Notice of meeting of Motor Carrier Safety Advisory Committee (MCSAC...

  5. 75 FR 2923 - Motor Carrier Safety Advisory Committee Public Meeting

    Science.gov (United States)

    2010-01-19

    ... DEPARTMENT OF TRANSPORTATION Federal Motor Carrier Safety Administration [Docket No. FMCSA-2006-26367] Motor Carrier Safety Advisory Committee Public Meeting AGENCY: Federal Motor Carrier Safety Administration (FMCSA), DOT. ACTION: Notice of Motor Carrier Safety Advisory Committee Meeting. SUMMARY: FMCSA...

  6. 75 FR 29384 - Motor Carrier Safety Advisory Committee Public Meeting

    Science.gov (United States)

    2010-05-25

    ... DEPARTMENT OF TRANSPORTATION Federal Motor Carrier Safety Administration [Docket No. FMCSA-2010-0143] Motor Carrier Safety Advisory Committee Public Meeting AGENCY: Federal Motor Carrier Safety Administration (FMCSA), DOT. ACTION: Notice of Motor Carrier Safety Advisory Committee meeting. SUMMARY: FMCSA...

  7. 75 FR 72863 - Motor Carrier Safety Advisory Committee Public Meeting

    Science.gov (United States)

    2010-11-26

    ... DEPARTMENT OF TRANSPORTATION Federal Motor Carrier Safety Administration [Docket No. FMCSA-2006-26367] Motor Carrier Safety Advisory Committee Public Meeting AGENCY: Federal Motor Carrier Safety Administration, DOT. ACTION: Notice of Motor Carrier Safety Advisory Committee Meeting. SUMMARY: FMCSA announces...

  8. 75 FR 50797 - Motor Carrier Safety Advisory Committee Public Meeting

    Science.gov (United States)

    2010-08-17

    ... DEPARTMENT OF TRANSPORTATION Federal Motor Carrier Safety Administration [Docket No. FMCSA-2010-0143] Motor Carrier Safety Advisory Committee Public Meeting AGENCY: Federal Motor Carrier Safety Administration (FMCSA), DOT. ACTION: Notice of Motor Carrier Safety Advisory Committee Meeting. SUMMARY: FMCSA...

  9. New relation to improve the speed and torque characteristics of induction motors

    Directory of Open Access Journals (Sweden)

    Luis Antonio Mier-Quiroga

    2015-01-01

    Full Text Available Los motores de inducción jaula de ardilla son empleados en gran variedad de aplicaciones. Ciertas aplicaciones requieren su operación a velocidad constante y en otras se requiere su operación a diferentes velocidades, como es el caso de proveer energía mecánica a vehículos eléctricos. El desempeño de un vehículo eléctrico depende de las características del motor eléctrico. La relación adecuada entre la magnitud del voltaje y la frecuencia de la fuente de alimentación permite que el motor cumpla con los requisitos del vehículo eléctrico. La magnitud del voltaje está en función de la frecuencia de operación. Si es adecuada la relación V - f , se puede mejorar la respuesta en velocidad del motor. Se presenta una nueva relación V - f , definida por un factor de frecuencia, que mejora la respuesta en velocidad del motor de inducción de rotor sencillo de jaula de ardilla. Para velocidades menores a la nominal, se mantiene la capacidad de par del motor con la relación propuesta.

  10. Pre-motor and motor activities in early handwriting

    OpenAIRE

    van Zwieten, Koos Jaap

    2011-01-01

    Behavioural studies make use of handwritten letters’ characteristics like strokes, roundedness, etcetera. In consequence, Fisher et al. (2010) studying brain activation during rejected love, noticed typical pre-motor activity patterns, as suggested by irregular writing patterns as well, due to basal ganglia dysfunction (Mergl et al., 2004). A short historical text written in a presumably depressed mood was checked on such characteristics in the light of hypothesised finger-, and hand movement...

  11. Location and determination of steps of capacitors in shunt for distribution power lines; Localizacion y determinacion de pasos de capacitores en derivacion para lineas de distribucion

    Energy Technology Data Exchange (ETDEWEB)

    Pampin Vergara, Gabriela; Sarmiento Uruchurtu, Hector [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2001-07-01

    A methodology is presented to determine the optimal location of the capacitor banks in shunt for distribution networks. The proposed tool allows knowing the bank type to install (fixed, disconnect able or of pass), as well as the electrical parameters of the feeder and the economic benefit that the banks of capacitors represent, with a minimum of input data. Its development in a spreadsheet allows the analysis of numerous alternatives in an easy way. The method is based on that the structure of the feeders of distribution is, generally, of radial type, with which, and by means of an iterative process, the optimal location of the capacitor banks in shunt is looked for. The type of bank is determined based of the demand, as well as the number of steps. The results of the analysis in feeders of the network of the central area are shown. [Spanish] Se presenta una metodologia para determinar la localizacion optima de los bancos de capacitores en derivacion en redes de distribucion. La herramienta propuesta permite conocer el tipo de banco a instalar (fijo, desconcectable o de paso), asi como los parametros electricos del alimentador y el beneficio economico que representan los bancos de capacitores, con un minimo de datos de entrada. Su desarrollo en una hoja de calculo permite el analisis de numerosas alternativas de manera facil. El metodo se basa en que la estructura de los alimentadores de distribucion es, por lo general, de tipo radial, con lo cual, y por medio de un proceso iterativo, se busca la localizacion optima de los bancos de capacitores en derivacion. Se determina el tipo de banco en funcion de la demanda, asi como el numero de pasos. Se muestran resultados del analisis en alimentadores de la red del area central.

  12. DEVELOPMENT OF FINE MOTOR COORDINATION AND VISUAL-MOTOR INTEGRATION IN PRESCHOOL CHILDREN

    OpenAIRE

    MEMISEVIC Haris; HADZIC Selmir

    2015-01-01

    Fine motor skills are prerequisite for many everyday activities and they are a good predictor of a child's later academic outcome. The goal of the present study was to assess the effects of age on the development of fine motor coordination and visual-motor integration in preschool children. The sample for this study consisted of 276 preschool children from Canton Sara­jevo, Bosnia and Herzegovina. We assessed children's motor skills with Beery Visual Motor Integration Test and Lafayette Pegbo...

  13. Maximum power operation of interacting molecular motors

    DEFF Research Database (Denmark)

    Golubeva, Natalia; Imparato, Alberto

    2013-01-01

    , as compared to the non-interacting system, in a wide range of biologically compatible scenarios. We furthermore consider the case where the motor-motor interaction directly affects the internal chemical cycle and investigate the effect on the system dynamics and thermodynamics.......We study the mechanical and thermodynamic properties of different traffic models for kinesin which are relevant in biological and experimental contexts. We find that motor-motor interactions play a fundamental role by enhancing the thermodynamic efficiency at maximum power of the motors...

  14. Motor control is decision-making.

    Science.gov (United States)

    Wolpert, Daniel M; Landy, Michael S

    2012-12-01

    Motor behavior may be viewed as a problem of maximizing the utility of movement outcome in the face of sensory, motor and task uncertainty. Viewed in this way, and allowing for the availability of prior knowledge in the form of a probability distribution over possible states of the world, the choice of a movement plan and strategy for motor control becomes an application of statistical decision theory. This point of view has proven successful in recent years in accounting for movement under risk, inferring the loss function used in motor tasks, and explaining motor behavior in a wide variety of circumstances. Copyright © 2012 Elsevier Ltd. All rights reserved.

  15. Mathematical Modeling of Diaphragm Pneumatic Motors

    Directory of Open Access Journals (Sweden)

    Fojtášek Kamil

    2014-03-01

    Full Text Available Pneumatic diaphragm motors belong to the group of motors with elastic working parts. This part is usually made of rubber with a textile insert and it is deformed under the pressure of a compressed air or from the external mass load. This is resulting in a final working effect. In this type of motors are in contact two different elastic environments – the compressed air and the esaltic part. These motors are mainly the low-stroke and working with relatively large forces. This paper presents mathematical modeling static properties of diaphragm motors.

  16. Motor Skill Competence and Perceived Motor Competence: Which Best Predicts Physical Activity among Girls?

    Science.gov (United States)

    Khodaverdi, Zeinab; Bahram, Abbas; Khalaji, Hassan; Kazemnejad, Anoshirvan

    2013-10-01

    The main purpose of this study was to determine which correlate, perceived motor competence or motor skill competence, best predicts girls' physical activity behavior. A sample of 352 girls (mean age=8.7, SD=0.3 yr) participated in this study. To assess motor skill competence and perceived motor competence, each child completed the Test of Gross Motor Development-2 and Physical Ability sub-scale of Marsh's Self-Description Questionnaire. Children's physical activity was assessed by the Physical Activity Questionnaire for Older Children. Multiple linear regression model was used to determine whether perceived motor competence or motor skill competence best predicts moderate-to-vigorous self-report physical activity. Multiple regression analysis indicated that motor skill competence and perceived motor competence predicted 21% variance in physical activity (R(2)=0.21, F=48.9, P=0.001), and motor skill competence (R(2)=0.15, ᵝ=0.33, P= 0.001) resulted in more variance than perceived motor competence (R(2)=0.06, ᵝ=0.25, P=0.001) in physical activity. Results revealed motor skill competence had more influence in comparison with perceived motor competence on physical activity level. We suggest interventional programs based on motor skill competence and perceived motor competence should be administered or implemented to promote physical activity in young girls.

  17. Tiempo para un cambio

    Science.gov (United States)

    Woltjer, L.

    1987-06-01

    En la reunion celebrada en diciembre dei ano pasado informe al Consejo de mi deseo de terminar mi contrato como Director General de la ESO una vez que fuera aprobado el proyecto dei VLT, que se espera sucedera hacia fines de este aAo. Cuando fue renovada mi designacion hace tres aAos, el Consejo conocia mi intencion de no completar los cinco aAos dei contrato debido a mi deseo de disponer de mas tiempo para otras actividades. Ahora, una vez terminada la fase preparatoria para el VLT, Y habiendose presentado el proyecto formalmente al Consejo el dia 31 de marzo, y esperando su muy probable aprobacion antes dei termino de este ano, me parece que el 10 de enero de 1988 presenta una excelente fecha para que se produzca un cambio en la administracion de la ESO.

  18. Motor-sensory confluence in tactile perception.

    Science.gov (United States)

    Saig, Avraham; Gordon, Goren; Assa, Eldad; Arieli, Amos; Ahissar, Ehud

    2012-10-03

    Perception involves motor control of sensory organs. However, the dynamics underlying emergence of perception from motor-sensory interactions are not yet known. Two extreme possibilities are as follows: (1) motor and sensory signals interact within an open-loop scheme in which motor signals determine sensory sampling but are not affected by sensory processing and (2) motor and sensory signals are affected by each other within a closed-loop scheme. We studied the scheme of motor-sensory interactions in humans using a novel object localization task that enabled monitoring the relevant overt motor and sensory variables. We found that motor variables were dynamically controlled within each perceptual trial, such that they gradually converged to steady values. Training on this task resulted in improvement in perceptual acuity, which was achieved solely by changes in motor variables, without any change in the acuity of sensory readout. The within-trial dynamics is captured by a hierarchical closed-loop model in which lower loops actively maintain constant sensory coding, and higher loops maintain constant sensory update flow. These findings demonstrate interchangeability of motor and sensory variables in perception, motor convergence during perception, and a consistent hierarchical closed-loop perceptual model.

  19. Motor carrier evaluation program plan

    International Nuclear Information System (INIS)

    Portsmouth, J.H.; Maxwell, J.E.; Boness, G.O.; Rice, L.E.

    1991-04-01

    The US Department of Energy (DOE) Transportation Management Program (TMP) has established a program to assist the DOE field offices and their contractors in evaluating the motor carriers used to transport DOE-owned hazardous and radioactive materials. This program was initiated to provide the DOE field offices with the tools necessary to help ensure, during this period of motor carrier deregulation, that only highly qualified carriers transport radioactive and hazardous commodities for the DOE. This program will assist DOE in maintaining their excellent performance record in the safe transportation of hazardous commodities. The program was also developed in response to public concern surrounding the transportation of hazardous materials. Representatives of other federal agencies, states, and tribal governments, as well as the news media, have expressed concern about the selection and qualification of carriers engaged in the transportation of Highway Route-Controlled Quantities (HRCQ) and Truckload (TL) quantities of radioactive material for the DOE. 8 refs

  20. Wet motor geroter fuel pump

    Energy Technology Data Exchange (ETDEWEB)

    Wiernicki, M.V.

    1987-05-05

    This patent describes a wet motor gerotor fuel pump for pumping fuel from a fuel source to an internal combustion which consists of: gerotor pump means comprising an inner pump gear, an outer pump gear, and second tang means located on one of the inner and outer pump gears. The second tang means further extends in a second radial direction radially offset from the first radial direction and forms a driving connection with the first tang means such that the fuel pump pumps fuel from the fuel source into the narrow conduit inlet chamber, through the gerotor pump means past the electric motor means into the outlet housing means substantially along the flow axis to the internal combustion engine.