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modelo de circular interna informativa

Centrifugal pump - Saylor.org
by marechausse 0 Comments favorite 58 Viewed Download 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

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

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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Iniciando com Zend Framework Este tutorial pretende dar uma introdução básica ao uso do Zend Framework através de uma aplicação baseada em bancos de dados. NOTA: Este tutorial foi testado com as versões 0.9 e 0.9.1 do Zend Framework. Existe uma grande chance de ser compatível com versões posteriores, mas certamente não funcionará com versões anteriores a 0.9. AVISO para a versão 0.9: Se você fez o download da versão 0.9 do Zend Framework, então você precisará editar o arquivo library/Zend/Db/Table/Row/Abstract.php e adicionar “<” no início da primeira linha. Arquitetura Model-View-Controller (Modelo-Visão-Controle) A maneira tradicional de desenvolver uma aplicação PHP é fazer algo parecido com o seguinte: include "common-libs.php"; include "config.php"; mysql_connect($hostname, $username, $password); mysql_select_db($database); ?> Através do tempo de vida de uma aplicação, uma aplicação escrita desta forma se torna passível de difícil manutenção conforme o cliente continue requisitando mudanças que são incluídas em diversos locais de seu código. Um método que melhora a manutenção de uma aplicação é separar o código de um arquivo em três partes distintas (e normalmente arquivos separados): Model A parte de modelo de uma aplicação é a parte que se preocupa com os dados específicos a serem mostrados. No código de exemplo acima, é o conceito de “news”. Dessa forma, model é geralmente relacionado com a lógica de negócios de uma aplicação e administra o carregamento e o salvamento de dados em um banco de dados. A view consiste em uma pequena parte da aplicação que é responsável em mostrar a informação ao usuário. Normalmente, é o HTML. O controller amarra o view e o model para garantir que as informações corretas sejam mostradas na página. O Zend Framework usa a arquitetura Model-View Controller (MVC). Isto é usado para separar as diferentes partes de sua aplicação para tornar o desenvolvimento e manutenção mais fácil. Requisitos O Zend Framework possui os seguintes requisitos: • PHP 5.1.4 (or maior) • Um servidor web que suporte a funcionalidade de mod_rewrite (reescrita de URLs). Este tutorial assume que esteja sendo utilizado o Apache. Obtendo o Framework O Zend Framework pode ser baixado de http://framework.zend.com/download/stable nos formatos .zip ou .tar.gz. No momento em que o tutorial era escrito, a versão 0.9 era a versão corrente. Você precisa baixar a versão 0.9 para este tutorial funcionar. Estrutura de diretórios Apesar de que o Zend Framework não designa uma estrutura de diretório, o manual recomenda uma estrutura comum. Esta estrutura assume que você tenha controle completo sobre a sua configuração do Apache, no entanto, nós queremos tornar a vida um pouco mais fácil, então usaremos uma modificação. Comece criando um diretório no diretório raiz do servidor web chamado zf-tutorial. Isto significa que a URL que apontará para a aplicação será: http://localhost/zf-tutorial...

Kumbia PHP Framework - FTP
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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

Phi-panel backpack assembly and keypad options This document guides you with assembling your phi-panel backpack and connecting it to the various available keypad options and customize your own keypads. Like phi-panel backpacks, these keypad options can be purchased, separately from phi-panel backpack, at my inmojo store: Please refer to the images in next sections. Note, the keypad kits don't include the phi-panel backpacks and backpack kits don't include keypad kits. All of these keypads are laser-cut 3mm black acrylic. If you need other colors, please check out ponoko.com for available materials and we can arrange for custom orders. Except for matrix keypad, all other keypads are glossy on one side and matte on the other side and totally reversible so you may decide which finish you like better. All kits come with mounting hardware (M3 screws, nuts and standoffs). These are keypad connections. Solder 8-pin right-angle male header or anything else you prefer. Refer to keypad connection diagrams. Connect the + side of a speaker to this pin and – side of speaker to a 300 ohm resistor then to -. To use a keypad kit, connect the 2-pin right-angle male header. See above. Ground, very convenient if you lay out your own buttons since each button needs one GND. No need to connect to if you use keypad kits. Use 6-pin right-angle female connector. Connect TX to Arduino RX, RX to Arduino TX. The MCU should be inserted to the socket with the half circle notch on the right side and circular dot on top right. This is the brown-black-black-red resistor to the right of the MCU. 16X2 LCD typically uses 47 ohm (yellow-purple-black-black) while 20X4 LCD typically uses 150 ohm (brown-green-black-black). To prevent damage, only 150 ohm is included. 16MHz crystal under shiny metal cap. Insert either way just like resistors. No polarity. Two 22pF capacitors on either side of the crystal. No polarity. Insert either way. Marked with 104. Slightly larger than 22pF capacitors. No polarity. Insert either way 10K trim potentiometer. You need to turn it to adjust contrast until you see text. First solder straight male headers to LCD. Only pins 1-6 and 11-16 need to be soldered. Trim all pins on the board that stick above the board. Use electric tape to cover the back side of the backpack. Plug LCD into the backpack, from below, with display facing down. Then solder LCD to the backpack...

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

Autodesk Robot Structural Analysis Professional Análise abrangente para os seus projectos de estruturas. complementa o Modelo de Informação da Construção (BIM) com análises e projectos digitais coordenados. O Autodesk Robot™ Structural Analysis Professional é uma aplicação de software colaborativa, versátil e rápida, que o pode ajudar a competir e a triunfar na economia global. Desenvolvido especialmente para o BIM, o Autodesk Robot Structural Analysis Professional calcula mesmo os seus modelos mais complexos, graças à potente criação automática de malhas de elementos finitos, algoritmos não-lineares e um conjunto completo de códigos de projecto, para o ajudar a conseguir resultados em minutos. O Autodesk Robot Structural Analysis Professional oferece um fluxo de trabalho sem problemas, colaborativo e interoperabilidade com ligações bidireccionais 3D com produtos de parceiros da Autodesk. A API (interface de programação de aplicações) aberta ajuda a proporcionar uma solução de análise dimensionável e específica do país para estruturas de edifícios grandes e complexos. Vantagens da subscrição Como vantagem exclusiva da Subscrição, as Robot™ Extensions para o Autodesk Robot™ Structural Analysis Professional ampliam as capacidades das ferramentas de análise de estruturas da Autodesk, oferecendo aos engenheiros de estruturas ainda mais flexibilidade para conseguirem os resultados pretendidos. Estão disponíveis ferramentas simples que permitem aos utilizadores extrair uma vasta gama de dados do Autodesk Robot Structural Analysis Professional e que não requerem experiência especial em programação. Modelação no Autodesk Revit Structure Análise de estruturas no Robot Structural Analysis Ligações bidireccionais com o Autodesk Revit Structure Experimente a potente integração bidireccional entre o Autodesk Robot Structural Analysis Professional e o software Autodesk Revit Structure. Importe e exporte sem problemas modelos de estruturas entre as duas aplicações, utilizando a ligação de análise Autodesk Revit Extensions. A ligação bidireccional permite que a análise de estruturas e os resultados de projecto sejam actualizados por todo o modelo de informação do edifício, para documentos de construção coordenados...

loft access door,circular access panel

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

Modeling Diesel Engine Cylinder Head Gaskets using the Gasket Material Option of the SOLID185 Element The modeling of diesel engine cylinder head gasket joints is complicated by the nonlinear response of the head gasket’s materials. Linearization of these material responses can lead to significant errors in the solution’s results. The 1-dimensional nonlinear approximation made by the Gasket material option of the SOLID185 element sufficiently captures the response of the nonlinear gasket materials while maintaining practical solution times for the large model sizes associated with multi-cylinder head gasket joint models.This paper will give an overview of the model building and assembly process used to create a head gasket joint model, describe the nonlinear nature of the materials used in the model, and present comparisons of the model’s results with experimental measurements. Previous analyses of cylinder head gasket joints using Ansys employed a process in which the nonlinear responses of the head gasket materials were linearized to allow the use of an elastic modulus (Reference 1).While moderately effective, this process required the material response to be fairly linear over the range of load experienced by the gasket. Also, this technique captured the global response of the joint, but the linear material assumption limited the model’s ability to accurately predict load variation around the gasket, especially in lightly loaded regions.These limitations motivated the creation of a Gasket material option for the SOLID185 element. Although limited to a 1-dimensional response (through the thickness of the gasket), this material option allows the user to define an arbitrary nonlinear loading curve, and various load-dependent nonlinear unloading curves.Initial clearance and separation can be incorporated into the response of the material, consequently Accurate modeling of head gasket joints requires a complex assembly of engine components. Special attention must be paid to the meshes at mating interfaces, as well as to the methods used to connect the components. This section will give an overview of the process used to create and connect the various components in a head gasket joint model. A head gasket joint model includes the cylinder head, head gasket, liners, cylinder block and head capscrews. An exploded view of the ISX head gasket joint model is shown in Figure 3. A plot of the head gasket model’s components is shown in Figure 4. One of the most complicated steps in creating this head gasket model involved forcing matching nodal patterns at all component interfaces. This is an important feature because the use of generalized contact, when combined with the nonlinear material response of the gasket components, would drive excessive solution times for a model of this size.The process of aligning nodal patterns begins in the solid modeling package, which was Pro/Engineer in this case. First, the models were cut down to the ½-1-½ cylinder sections. This model configuration was chosen because it allows the simulation of an infinitely long engine firing every other cylinder when symmetry is applied to both ends and the center cylinder is fired. This is the minimum model size allowable for accurate results for the head gasket during a cylinder firing event. The cylinder block was then cut below the midstop support feature. Next, the models of the cylinder head and cylinder block were modified so that every feature on the block top deck matched with the corresponding feature on the head bottom deck. The head capscrew holes in the cylinder block were modified to give a cylindrical area that equaled the length of the thread engagement at the pitch diameter of the capscrew threads at the appropriate depth. Annular protrusions were added to the bottom deck of the cylinder head to give concentric circular lines where the combustion seal, graphite ring,...

Ford Everest: 10 Seater Vehicle
by jonhnalexa 0 Comments favorite 89 Viewed Download 0 Times

Ford Everest: 10 Seater Vehicle Vehicle Summary Features and Benefits • A superior 10 seater off-road SUV developed in conjunc on with interna onal aid and development organiza ons • Customizable haulage applica on and equipment to suit your exac ng needs • Uprated brake and suspension package to reduce maintenance cost and vehicle down me Sea ng capacity up to 10 passengers including the driver Ford Qualified Vehicle Modifier cer fied program Improved safety and reliability Sea ng capacity easily re-configured for the larger cargo space when required High ground clearance to minimize damage to the vehicle undercarriage Enhanced handling suspension package to reduce body roll and provide superior on and off road handling and ride comfort* Enhanced fuel filter kit adding performance and protec on against poor quality fuel and impuri es Upgraded brake package: front disc rotors improving brake cooling and brake pad durability - The company reserves the right to change the vehicle specifica ons and features described in this publica on at any me - Vehicle specifica ons and features may vary in different markets - Images are for illustra ve purposes only and may appear different to the actual vehicle Version RC1.0_12042011 Product Fact Sheet Ford Everest: 10 Seater vehicle 178.8 cm 286 cm 506.2 cm Vehicle Detail Manufacturer Model Engine Type Engine Capacity/ Power [kW] Induc on Drivetrain Transmission Torque [Nm]...

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