Mostrando recursos 1 - 20 de 405

  1. EFFECT OF HIGH INTENSITY LED LIGHT ON THE GERMINATION AND GROWTH OF BROCCOLI SEEDLINGS (BRASSICA OLERACEA L.

    Guillermo Paniagua-Pardo; Claudia Hernández-Aguilar; Fernando Rico-Martínez; Flavio Arturo Domínguez-Pacheco; Efraín Martínez-Ortiz; Claudia Lizbeth Martínez-González

    Dado su alto valor nutricional y los beneficios a la salud por los compuestos anticancerígenos que posee, el brócoli (Brassica oleraceaL.) se ha convertido en un cultivo de importancia dentro de las hortalizas, por lo que es necesario incrementar su consumo y producción por la sociedad mexicana. Esta investigación planteó como objetivo evaluar el efecto de la luz LED de alta intensidad de distinta longitud de onda (rojo, azul y verde), en germinación y crecimiento de plántulas de brócoli, evaluando las variables velocidad...

  2. Sistema fotovoltaico de iluminación solar

    Víctor Hugo Benítez Baltazar; Guadalupe Araceli Torres Valverde; Luis Armando Gámez Valdéz; Jesús Horacio Pacheco Ramírez
    El artículo es el resultado de un trabajo de investigación enfocado al uso de sistemas fotovoltaicos para la iluminación por medio de diodos emisores de luz tipo LED. Se busca reducir el consumo energético mediante la implementación de un sistema de iluminación basado en LED hasta en un 80%, donde la fuente primaria de energía es el Sol. Se demuestra la viabilidad de los sistemas solares de iluminación LED mediante la construcción de un prototipo. Los sistemas de iluminación fotovoltaicos son una alternativa real para ahorrar energía eléctrica e igualmente representan un campo de investigación abierto en muchos sentidos.

  3. A VIRADA ESPACIAL

    Ana Fani Alessandri Carlos
    Desde una perspectiva de la geografía, el artículo dibuja un punto de vista teórico y metodológico de aná - lisis de la realidad urbana, desde la centralidad de la categoría de “producción del espacio” como momento constitutivo de la manera que hace que la llamada metageografia. Una hipótesis se desarrolla a lo largo de este artículo: el proceso de reproducción de la sociedad se lleva a cabo en el mundo moderno a través de la producción del espacio urbano. Es a través de la producción del espacio que el capital se realiza apuntando a la constitución de la ciudad como...

  4. Fotografía digital: una guía sencilla de actualización

    C.A. Soto-Medina; J. Guerrerosantos; Y. de la Torre-Guerrerosantos
    La fotografía digital se encuentra en un periodo en el que tecnológicamente ha sufrido un gran avance; no sólo las cámaras de hoy capturan imágenes increíbles con muy poca luz, sino que también esta tecnología se ha abaratado hasta estar al alcance de todos. En el campo de la Cirugía Plástica, el llevar un expediente digital fotográfico del paciente quirúrgico de manera ordenada es crucial para poder seguir su evolución. Resulta por lo tanto indispensable estandarizar el lugar y la técnica empleados para fotografiar a los pacientes y así poder obtener imágenes de mayor credibilidad y confiabilidad a lo largo...

  5. Condiciones de trabajo en el transporte público por carretera

    Elena Ordaz Castillo; Jerónimo Maqueda Blasco
    Objetivo: Caracterizar las condiciones de trabajo de los conductores de transporte de viajeros por carretera estableciendo un perfil diferencial con el resto de la población trabajadora. Métodos: Encuesta dirigida a conductores de transporte de viajeros por carretera para determinar la morbilidad percibida y los factores relacionados con el trabajo que incrementan el riesgo de estos profesionales. En total se entrevistaron 1428 conductores seleccionados por muestreo aleatorio. Se eligió como población de referencia la VI Encuesta Nacional de Condiciones de Trabajo (VI-ENCT/INSHT). Para garantizar la comparabilidad entre nuestro estudio y la VIENCT, se seleccionaron en ambas encuestas varones en edades comprendidas...

  6. Conciencia ambiental y conducta sustentable relacionada con el uso de energía para iluminación

    Graciela Lucía Tonello; Natalia Valladares
    La conciencia ambiental es definida como un concepto multidimensional que constituye la dimensión actitudinal del comportamiento pro ambiental. En un contexto global y local de crisis energética, el presente trabajo tuvo como objetivos investigar las interrelaciones entre las diferentes dimensiones de la conciencia ambiental y la posible sustentabilidad detrás de conductas relacionadas con el uso de la iluminación, en una muestra de estudiantes universitarios. La metodología incluyó el desarrollo y administración de una encuesta con diferentes secciones para estimar la conciencia ambiental mediante escalas clasificatorias y preguntas sobre percepción de problemas ambientales, la atribución de responsabilidades, escalas estandarizadas de preocupación...

  7. Escuela para señoritas, Inglaterra

    Stillman y Eastwlck-Field, Arquitectos
    The object was to design part of a new building which had been seriously damaged during the war, so that the old and new parts would blend into a pleasant whole, with a capacity for 600 girls. The new designs avoid the glass box style of school buildings, and glass walls have been adopted only on the ground floor, thus giving an impression of light and airiness to what used to be a partial basement. Classrooms have been designed in a simple manner, and give the impression of conventional rooms. Simple lines and materials have been chosen throughout. Strong contrasts...

  8. Construcción de un anfiteatro subterráneo de mil plazas

    Hereng, J. M.
    The Arts and Crafts School of Paris was in need of an auditorium, with accommodation for one thousand persons, suitable for lessons and lectures. Owing to lack of space, it was decided to build it underground, below one of the courtyards. The choice of roof shape was an ellipsoid of revolution, whose major axis is inclined to the horizontal. The maximum diameter is 32 ms and maximum height is 10 ms. The thickness of the roof structure is 50 cms along the lower part, and 20 cms near the crown. This solution was of special interest as it overcame simultaneously...

  9. Aeropuerto de Orly, accesos y pistas

    Genet, P.
    Paris airport consists of the whole set of air transport facilities, commercial and civil, which are being exploited at the two main airport terminals of Le Bourget and Orly. Le Bourget became inadequate to cope with the growing air traffic which the size of Paris demanded, and as the surrounding zone did not allow it to be sufficiently enlarged, the further development was concentrated at Orly. This airport was begun before the last world war, and was continued, and even improved, during the war itself, by the German occupation authorities. Even so, the layout was too small to adapt the...

  10. Motel en Lainate, Italia

    Perogalli, Carlo
    This Motel occupies a site near the Milan Laghi motorway. Motels are characterised by the type of «cell», or independent apartment, which is a kind of «villa», of easy access, where the car can be parked close by, ready for immediate departure. For this reason this motel has been constructed on one level. Garages are roofed over, and are at street level. The living room is slightly raised, to avoid it being overlooked from outside. The apartments consist of a bedroom, services, and garage. They occupy a double building; the services being separated from the bedroom, to avoid any noise disturbance...

  11. Posibilidades estructurales de las superficies parabólico – hiperbólicas

    Bennet, J. D.
    The author presents a number of general facts on the subject. He gives the surface equation and that of the generator line. He offers simple and quick methods of establishing the forces and stresses in parabolic hyperbolic shells. The various types of roofs conforming to this mathematical shape are analysed. Attention is given to the wide field of application of this general kind of structure, both in urban architecture and in connection with large and industrial buildings. A simple way is offered to obtain good natural illumination with this type of roof structure. A number of illustrations are shown to...

  12. Tomado: edificio para oficinas

    Maaskant, -; van Dommelen, -; Kroos, -
    This building, in a city of medieval style, stands out for its white symmetry, which contrasts, like an abstract sculptural design in the midst of classical patterns. The basic ideas underlying the design were to provide a truly visual relation with the exterior, and to show the affinity between architecture and the other plastic arts. The artificial illumination helps to give plasticity to the volume of the building at night, and the reflected daylight, emphasizing the horizontal lines, discovers alternative aspects of this building. In furnishing it, chairs by Mies van der Rohe have been selected, as a small homage...

  13. Iglesia de San Bernardo, Munich

    Haindl, Friederich F.
    In plan form this church has the shape of an irregular pentagon. The external walls are in brick and are crowned by a reinforced encircling concrete polygonal hoop. The surfaces of the walls are faced both on the outside and internally. The roof consists of metal girders resting at the convergence of the walls on the concrete encircling girder. Timber trellice joists join these girders. Inside, the maximum height of the ceiling is 25 ms, and the continuity of the walls is broken by prefabricated panels carrying glazing, which provides suitable daylight illumination. The roof structure is lined with wood, to...

  14. Iglesia reformista, Effretikon

    Gisel, Ernst
    The structure and planform, as well as the elevation of this building is a consequence of the system of natural illumination that has been adopted. A series of concrete slabs, which join together anglewise, provide the framework for skylights, through which a uniform and satisfactory distribution of light enters the inside. This avoids the troublesome effect of direct lighting during the religious services. The church entrance, the cloisters, the church itself —offering seated accommodation for 450 people —and the meeting hall constitute the main functional units of the total project. The tower has great plastic power. It emerges from the...

  15. Edificio social de la academia evangélica en Mülheim-Ruh

    Winter, F. G.
    An extension to the existing buildings was recently carried out at the above Academy. This extension comprises: a building for guests, with 42 rooms, an auditorium, and a wide passage joining the new and the old parts. This passage way has a number of uses. It connects on the same level the main floor of the existing buildings with the auditorium and with the second storey of the residential building. It constitutes a kind of promenade gallery, and it also serves as a meeting place during the intervals, for people participating in lectured and congresses. In the guest house, the...

  16. Centro de estudios hidrográficos, en Madrid

    Fisac, M.
    The design and construction of this group of buildings follows a basic conception of great formal simplicity and total structural expressiveness. The buildings which constitute this research centre are: a main building, of seven stories, to house the offices, board room, auditorium, discussion room, and ancillaries; a large hall for the reduced scale models, and two smaller halls house the hydraulics laboratories; a two storey building, devoted to auxiliary technical offices, workshops, cafeteria, changing rooms, workmen's dining room, etc.; another building of two floor levels, for rheology work; and a house for the porter. The roof of the hall for...

  17. Nuevas construcciones y trabajos de ampliación de la siderurgia Lohr, en Lohr-am-Main, Alemania

    Siegel, Curt; Wonneberg, Rudolf; Richter, Hermfried
    The geometrical properties of the hyperbolic paraboloid provided certain advantages to the architects, when they designed the new casting mill of the Lohr steel works, especially in regard to illumination and ventilation. Two similar hyperbolic parabolic surfaces, bounded by three straight and two curved edges, and joined together by a transition surface, form the top part of the ventilation dome. The northern elevation constitutes a skylight, of trapeze-like shape. Each of these domes, whose plan dimensions are 13.5 by 15 ms, rest on isolated supports, which, in turn, along the longitudinal direction of the nave, serve to support a bridge...

  18. Centro de investigaciones I.B.M., en las proximidades de Niza

    Breuer, Marcel; Gatje, Robert F.; Laugier, Richard; Laugier, Michel
    In order to fit in with the landscape and also meet the local building regulations, this Centre was planned as a two storey building, lifted above the ground by columns, whose height varies between 4.29 and 7.92 m, according to the ground slope. The building planform is in the shape of a double Y, and has, among others, the advantages of making it possible to provide natural illumination to all the rooms, reduce the maximum distance of the most distant parts of the building from the vertical communications, and avoid that one wing of the building shall interrupt the view...

  19. Jardín infantil, en Beniarjó, Valencia

    García Ordóñez, F. M.; Dexeus, J. M.
    This children's nursery has been provided so that the children of the town can be looked after during the periods when their mothers are busy collecting oranges. The building has, in addition to the director's quarters, eight school rooms, wash rooms, covered playing ground, indoor garden, living quarters for the nuns and a cloister. The various functional parts of the building are well differentiated, both spatially and in style. The lighting and ventilation has been the object of special study, and all the rooms have plenty of light, and are extremely diaphanous. The style aims at giving the children a...

  20. Sala de exposiciones, en Madrid

    Sáenz de Oiza, Francisco
    The Huarte Building houses an 800 square metre section devoted to meetings, lectures and exhibitions. This extends over three storeys, namely ground floor, first and second basements. The first basement level is a single large room, meant primarily for meetings and exhibitions. It has a large table in the centre, folding seats round the sides, two small discussion Corners and a bar. Illumination is provided through stiff plastic trays hanging from the ceiling, which serve to diffuse the fluorescent lighting. They also distribute the conditioned air, which emerges from the joints between the trays. The second basement is also an...

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