Nuclear power is produced by controlled (i.e., non-explosive) nuclear reactions. Commercial and utility plants currently use nuclear fission reactions to heat water to produce steam, which is then used to generate electricity.
Thursday, 2 September 2010
Monday, 30 August 2010
Garmin Nuvi 1350
Garmin Nuvi 1350
Full Package - In the Box
Features
Full Package - In the Box
- Garmin original GPS
- Vehicle suction cup mount
- Vehicle power cable
- Dashboard disc
Features
- Voice prompt navigation
- Speak Street Name
- Fast off route and detour recalculation
- Lane assistant and Junction View
- FOC POI, Speed camera , redlight camera , speed alart , accident area warning and much more with voice and text notification
- Latest maps and update lifetime
- Preloaded with 10 countries map including Mal, Sg, Brunei, Indon, Thai, Vietnam, Philipine etc..
Monday, 2 August 2010
Control Valves
Control valves are valves used in pipelines to control operating conditions such as flow, pressure, temperature, and liquid level by fully or partially opening or closing in response to a process signal. Fisher®, Baumann™, and POSI-SEAL® brand control valves can be located via links on this page.
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Thursday, 22 July 2010
Job description
A control and instrumentation engineer (CI engineer) is essentially responsible for designing, developing, installing, managing and/or maintaining equipment which is used to monitor and control engineering systems, machinery and processes.
The main objective of the work of CI engineers is to ensure that these systems and processes operate effectively, efficiently and safely. They usually work for the companies who manufacture and supply the equipment, or for the companies who use it.
CI engineers need a thorough understanding of the operational processes of an organisation and have a truly multidisciplinary role, working closely with colleagues across a number of functions, including operations, purchasing and design.
Typical work activities
Control and instrumentation engineers (CI engineers) will develop skills in specific control disciplines such as advanced process control (APC), distributed control systems (DCS), programmable logic controllers (PLC), and supervisory control and data acquisition (SCADA). The use of these disciplines will depend on the exact nature of individual job roles. Tasks and responsibilities which are common to many CI engineer positions, however, may include:
- designing and developing new control systems;
- maintaining and modifying existing systems;
- managing operations;
- working collaboratively with design engineers, operation engineers, purchasers and other internal staff;
- liaising with clients, suppliers, contractors and relevant authorities (e.g. the Nuclear Decommissioning Authority);
- project management within cost and time constrained environments;
- troubleshooting and problem-solving;
- understanding and ensuring compliance with the health and safety regulations and quality standards of the country in which work is undertaken;
- providing advice and consultancy support;
- purchasing equipment;
- writing computer software;
- developing new business proposals;
- accepting responsibility and a level of accountability commensurate with the seniority of the position.
Refer to this website: http://ww2.prospects.ac.uk/
Saturday, 15 May 2010
Nokia N97 Mini
* Slide-n-tilt 3.2" 16M-color resistive touchscreen of 640 x 360 pixel resolution
* 5 megapixel autofocus camera with dual-LED flash and VGA@30fps video recording
* Symbian OS 9.4 with S60 5th edition UI with kinetic scrolling
* Slide-out three-row full QWERTY keyboard
* ARM 11 434MHz CPU and 128 MB of RAM
* Quad-band GSM and tri-band 3G with 3.6Mbps HSDPA support
* Wi-Fi and GPS with A-GPS
* Digital compass
* 8GB onboard storage
* microSD card slot with microSDHC support
* Built-in accelerometer
* 3.5 mm audio jack and TV-out
* Stereo FM Radio with RDS
* microUSB port (charging) and stereo Bluetooth v2.0
* Web browser has full Flash and Java support
* Nice audio reproduction quality
* Office document viewer
Main disadvantages
* The S60 touch UI is still inconsistent
* Outdated camera interface and features
* No DivX or XviD video support out-of-the-box
* No smart dialing
* No office document editing (without a paid upgrade)
* No camera lens protection
* No FM transmitter (though that may be stretching it too far)
Nokia N97 mini vs Nokia N97
* More compact (113 x 52.5 x 14.2 mm, 75 cc vs 117.2 x 55.3 x 15.9 mm, 88 cc)
* Lighter (138g vs 150g)
* Smaller display (3.2" vs 3.5")
* Less internal memory (8GB vs 32GB)
* Smaller battery (1200 mAh vs 1500 mAh)
* No lens cover
* No FM transmitter
* Arrow keys vs D-pad
Is it a good choice?
Wednesday, 17 February 2010
Francis Turbine
Francis Turbine BladeThe Francis turbine is a type of water turbine that was developed by James B. Francis. It is an inward flow reaction turbine that combines radial and axial flow concepts. Francis turbines are the most common water turbine in use today. They operate in a head range of ten meters to several hundred meters and are primarily used for electrical power production.
Theory of Operation
The Francis turbine is a reaction turbine, which means that the working fluid changes pressure as it moves through the turbine, giving up its energy. A casement is needed to contain the water flow. The turbine is located between the high pressure water source and the low pressure water exit, usually at the base of a dam.The inlet is spiral shaped. Guide vanes direct the water tangentially to the turbine wheel, known as a runner. This radial flow acts on the runner's vanes, causing the runner to spin. The guide vanes (or wicket gate) may be adjustable to allow efficient turbine operation for a range of water flow conditions. As the water moves through the runner its spinning radius decreases, further acting on the runner. For an analogy, imagine swinging a ball on a string around in a circle; if the string is pulled short, the ball spins faster due to the conservation of angular momentum. This property, in addition to the water's pressure, helps Francis and other inward-flow turbines harness water energy efficiently.
Application
Francis turbines may be designed for a wide range of heads and flows. This, along with their high efficiency, has made them the most widely used turbine in the world. Francis type units cover a head range from 20 meters to 700 meters, and their output power varies from just a few kilowatts up to one gigawatt. Large Francis turbines are individually designed for each site to operate at the highest possible efficiency, typically over 90%. In addition to electrical production, they may also be used for pumped storage; where a reservoir is filled by the turbine (acting as a pump) during low power demand, and then reversed and used to generate power during peak demand.
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