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# modelo de circular interna informativa

### Centrifugal pump - Saylor.org

by marechausse 0 Comments 58 Viewed 0 Times

Centrifugal pump A centrifugal pump is a rotodynamic pump that uses a rotating impeller to increase the pressure of a fluid. Centrifugal pumps are commonly used to move liquids through a piping system. The fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller, flowing radially outward into a diffuser or volute chamber (casing), from where it exits into the downstream piping system. Centrifugal pumps are used for large discharge through smaller heads. According to Reti, the Brazilian soldier and historian of science, the first machine that could be characterized as a centrifugal pump was a mud lifting machine which appeared as early as 1475 in a treatise by the Italian Renaissance engineer Francesco di Giorgio Martini.[1] True centrifugal pumps were not developed until the late 17th century, when Denis Papin made one with straight vanes. The curved vane was introduced by British inventor John Appold in 1851. Like most pumps, a centrifugal pumps converts mechanical energy from a motor to energy of a moving fluid; some of the energy goes into kinetic energy of fluid motion, and some into potential energy, represented by a fluid pressure or by lifting the fluid against gravity to a higher level. The transfer of energy from the mechanical rotation of the impeller to the motion and pressure of the fluid is usually described in terms of centrifugal force, especially in older sources written before the modern concept of centrifugal force as a fictitious force in a rotating reference frame was well articulated. The concept of centrifugal force is not actually required to describe the action of the centrifugal pump. In the modern centrifugal pump, most of the energy conversion is due Cutaway view of centrifugal pump to the outward force that curved impeller blades impart on the fluid. Invariably, some of the energy also pushes the fluid into a circular motion, and this circular motion can also convey some energy and increase the pressure at the outlet. The relationship between these mechanisms was described, with the typical mixed conception of centrifugal force as known as that time, in an 1859 article on centrifugal pumps, To arrive by a simpler method than that just given at a general idea of the mode of action of the exterior whirlpool in improving the efficiency of the centrifugal pump, it is only necessary to consider that the mass of water revolving in the whirlpool chamber, round the circumference of the wheel, must necessarily exert a centrifugal force, and that this centrifugal force may readily be supposed to add itself to the outward force generated within the wheel; or, in other words, to go to increase the pumping power of the wheel...

### Wilsons Auctions Ltd Catalogue for Sale on Saturday, April, 27, 2013

by januar 0 Comments 86 Viewed 0 Times

Wilsons Auctions Ltd Catalogue for Sale on Saturday, April, 27, 2013 Lot Description Makita 150MM - 110V CIRCULAR SAW LIGHT DUTY 110V Karcher VACUUM 1-MOTOR Makita 13MM COLLET, 110V ROUTER, Flex Plung Saw Makita - 240V PALM SANDER Makita - 240V PALM SANDER 240V EDGING SANDER Makita LOW VIBRATION RECIPROCATING SAW Makita 125MM ANGLE GRINDER Makita 110V ORBITAL SANDER HILTI H-DUTY CHASING MACHINE De Walt Table Chop Saw ELECTRIC PIPE PRESSURE TEST PUMP 200 AMP HF INVERTER WITH TIG Concrete Air Nialer Yellow Pinning Gun RECIPROCATING SAW,LOW VIBRATION ANGLE GRINDER 230MM ANGLE GRINDER 125MM COMPACT TILE SAW ANGLE GRINDER 230MM HEDGE TRIMMER PETROL DISC SANDER - 110V FEIN Multi Tool CHAINSAW 15" - ELECTRIC RECIPROCATING SAW,LOW VIBRATION 150AMP INVERTER WELDER Hilti TE74 TCT METAL CUTTING MITRE SAW Spit SDS Drill ELECTRIC DIE STOCK All assets must be paid for in full and removed from the sale by 5pm Wednesday May 1st or a €50 per day storage charge will be incured per asset...

### Choosing a digital camera for your microscope ... - DrJohnRuss.com

by cr007 0 Comments 145 Viewed 0 Times

Choosing a digital camera for your microscope John C. Russ, Materials Science and Engineering Dept., North Carolina State Univ., Raleigh, NC One vital step is to choose a transfer lens matched to your sensor or chip size. Digital cameras come with chip sizes that range from the size of a 35 mm ﬁlm negative (36 mm x 24 mm) down to consumer cameras with stated sizes such as "1/3" or "1/1.8" inch. Note that these descriptions are not actual dimensions! The "1/3" chips are actually 4.8 x 3.6 mm (and there are smaller sizes out there). Matching a high-quality single lens reﬂex body such as the Nikon D80 or Canon EOS 400 to a camera may be an option, given its other potential uses in the lab, and reasonable cost, but it is important to understand a few things about all digital cameras before making a choice. The D80, as an example, has a 10 million photosites (called individual sensors below, since the word "pixel" has too many different meanings in various contexts) each of which is 6 µm square. By comparison, in a 1/1.8 chip with 4 million photosites each would be 3 µm square. (These values also allow for a space of about one half µm between the individual sensors to isolate them electrically, and this applies to CCD detectors, not CMOS chips which also require two or three transistors for each photosite, which also take up space). Figure 1 illustrates the relative sizes of different detectors. Figure 1. Relative sizes of a 25 mm negative, APS chip (used in digital SLR's such as the Nikon D80), and the "1/1.8" and "1.3" inch chips used in typical consumer cameras. The role of the transfer lens is to project the image onto the chip. Normally the rectangular area that is captured is set well inside the circular ﬁeld of the microscope, to avoid focus and illumination variations near the edge. In my rather typical setup, with a 10x objective the captured image ﬁeld is about 1600 µm wide, and with a 100x objective it is about 160 µm wide. We'll use those numbers again shortly. The maximum resolution of a digitized image is deﬁned by the Nyquist limit as the spacing corresponding to two pixels (not one, since there must be a dark pixel separating two light ones, or vice versa, for them to be distinguished). For a 3600x2400 sensor chip, typical of a high end 10 Megapixel single-lens-reﬂex camera, this corresponds to 13 µm on the chip, and for a 10x objective represents 0.9 µm on the specimen. This is, of course, better than the optical resolution of that objective lens. With a 100x objective lens, assuming an optical resolution of 0.5 µm on the specimen, the same chip would represent that 0.5 µm distance with 45 digitized pixels, which is a vast oversampling...

### Iniciando com Zend Framework

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### Kumbia PHP Framework - FTP

by hirax 0 Comments 221 Viewed 0 Times

Kumbia PHP Framework Porque Programar debería ser más fácil Libro de Kumbia: Porque Programar debería ser más fácil Índice de contenido Agradecimientos.........................................................................................................................12 Introducción................................................................................................................................13 Sobre El Libro de Kumbia............................................................................................................15 ¿Nuevo en uso de Frameworks?.................................................................................................16 4.1 ¿Qué hace un Framework?..................................................................................................16 4.2 Realizar aplicaciones orientadas a Usuarios .......................................................................16 4.3 ¿Por qué Kumbia y no otro Framework? .............................................................................16 5 Sobre Kumbia.............................................................................................................................17 6 Kumbia en su Punto....................................................................................................................18 6.1 Introducción .......................................................................................................................18 6.2 ¿Qué es un Framework? .....................................................................................................18 7 Kumbia vs Otros Frameworks.....................................................................................................19 8 ¿Qué es Kumbia?........................................................................................................................20 9 ¿Está hecho kumbia para mí?.....................................................................................................22 10 Nueve Razones para Usar Kumbia............................................................................................23 11 Instalando Kumbia....................................................................................................................24 11.1 Prerrequisitos ...................................................................................................................24 11.2 Instalando ........................................................................................................................24 11.3 Configuración de Apache ..................................................................................................24 11.3.1 ¿Por qué es importante Mod-Rewrite?........................................................................25 11.4 Configuración de PHP........................................................................................................26 11.5 Porque Kumbia utiliza PHP5?.............................................................................................26 11.6 Configuración de MySQL ..................................................................................................26 11.7 Instalación y Configuración con Oracle .............................................................................26 11.8 Detalles Específicos para SO ............................................................................................27 12 Creación de Proyectos..............................................................................................................28 12.1 Introducción .....................................................................................................................28 12.2 Iniciar un Proyecto ............................................................................................................28 12.3 Directorios de Kumbia ......................................................................................................28 12.4 Otros Directorios ..............................................................................................................28 12.5 Resumen ..........................................................................................................................28 13 Explicando la Configuración......................................................................................................29 13.1 Introducción .....................................................................................................................29 http://www.assembla.com/wiki/show/kumbia/Parte1-Capitulo4..................................................29 14 A partir de un Modelo MVC.......................................................................................................29 15 Explicando la Implementación MVC..........................................................................................30 15.1 Introducción .....................................................................................................................30 15.2 Conceptos ........................................................................................................................31 15.3 Ejemplo ............................................................................................................................31 16 Primera Aplicación en Kumbia..................................................................................................32...

### Phi-panel backpack assembly and keypad options Dr. John ... - InMojo

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### Autodesk® Robot™ Structural Analysis Professional ... - Siscad

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### loft access door,circular access panel

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Timloc Building Products have been producing pre-formed cavity trays, roof and wall ventilation products, loft access doors, cavity closers

### Modeling Diesel Engine Cylinder Head Gaskets using the ... - Ansys

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