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# cual es la estructura de una carta circular

### Centrifugal pump - Saylor.org

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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. History Warman centrifugal pump in a Coal Handling and Preparation Plant (CHPP) application 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. How it works 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, thus:[2] Centrifugal pump 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. The outward force generated within the wheel is to be understood as being produced entirely by the medium of centrifugal force if the vanes of the wheel be straight and radial; but if they be curved, as is more commonly A centrifugal pump uses a spinning "impeller," the case, the outward force is partly produced through the which normally has backward-swept blades that medium of centrifugal force, and partly applied by the vanes to directly push water outward. the water as a radial component of the oblique pressure, which, in consequence of their obliquity to the radius, they apply to the water as it moves outwards along them. On this subject it is well to observe that while the quantity of water...

### Trail of Tears Tennessee - National Park Service

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### SAFETY SHEET # 11 GRINDING MACHINERY Consult the Ontario ...

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### Algebra and Functions Geometry and Trigonometry Statistics and ...

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### SOLICITUD DE EMPLEO FOTO - Ministerio de Educación - Guatemala

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### solicitud de empleo administrativo - Ulacit

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### El 80% dE las ofErtas dE EmplEo no llEga a conocErsE En ... - Adecco

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### Informe III trimestre Iniciativas Tácticas - DGT - Ministerio de Hacienda

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### informe: impuesto a la transmisión gratuita de bienes - Colegio de ...

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Con la sanción de la ley 14.044, publicada el 16/10.2009, se introduce el título IV Bis al Código Fiscal, por el cual se establece la vigencia del Impuesto a la Transmisión Gratuita de Bienes. Este nuevo tributo grava a todo aumento de riqueza, que se configure como consecuencia de una transmisión o acto de esa naturaleza, que comprenda o afecte uno o más bienes situados en la Provincia y/o beneficie a personas físicas o jurídicas con domicilio en la misma. Sin perjuicio de ello, no estarán alcanzados por el Impuesto a la Transmisión Gratuita de Bienes, los enriquecimientos patrimoniales a título gratuito cuyos montos totales no superen la suma que establezca anualmente la Ley Impositiva. Dentro de los actos que son gravados por este impuesto, el Código se encarga de enumerar a las herencias; los legados; las donaciones; los anticipos de herencia; cualquier otro hecho que implique un enriquecimiento patrimonial a título gratuito. Por otro lado, de tratarse de donaaciones, legados o anticipos de herencia, los mismos se encuentran siempre gravados, no obstante estos sean compensatorios, retributivos o con cargo. II.- OBJETO DEL IMPUESTO Y PRESUNCIONES. El Código, en ciertos casos, presume salvo prueba en contrario, que se encuentran gravados por este impuesto, ciertos actos que en principio no se muestran como meras transmisiones gratuitas. Estos casos son: • Transmisiones a título oneroso de inmuebles a quienes llegaren a ser herederos o legatarios del causante dentro de los tres (3) años de producidas si fuesen directas, o de cinco (5) años si se hicieren en forma indirecta por interpósitas personas; ...

### Informe sobre los tributos locales en la provincia de Cádiz 2011

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