Wednesday, May 27, 2009

Thermofoaming


Thermofoam is a medium density white foam that is specifically non-allergenic. Its configuration is a closed cell, cross linked polyethylene and is a member of the olefin family of plastics. This configuration allows the foam to provide outstanding force dispersion equally in all directions. It is available in two densities to increase the ability of the practitioner in precise pressure application. The compression of the foam and its hypoallergenic composition lead to high patient compliance.

Manufacturing
Thermofoam has excellent, thermoforming and thermobonding characteristics. It can be knifed, die cut, or punched. It can be shaped by drape, vacuum, and pressure molding techniques. The normal forming temperature is 310 F. Thermofoam has a short heat cycle and a very short working time (.5-2 minutes). Once molded, it can be modified using localized heat.

Thermobonding is possible with all polypropylenes and polyethylenes, as well as other thermobonding materials. It may be necessary to apply a vacuum interface when vacuum forming Thermofoam, due to its good mold replication accuracy and ability to mark off. This material is self adhering at forming temperatures.

Thermofoam may not be solvent welded. Most good plastic glues will mechanically bond the foam to plastics and provide medium strength bonds to metals. Spot heat welding is possible, but not recommended for strength requiring bonds. It can be cleaned using acetone.


Friday, June 27, 2008

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Royal Enfield Thunderbird is a cruiser that offers comfortable ride with sufficient power on tap. Thunderbird is stacked with plenty of modern technology to make it more proficient. Royal Enfield Thunderbird features an all new left side gear-shift matched with the AVL 350 Aluminum Engine and a CV carburetor.

Royal Enfield Thunderbird is attractively styled with loads of chrome. There is minimal graphic display, the cumbersome fuel tank extensions are absent and at the same time weld lines are cleaner. The paint job is eye-catching with strong vibrant shades. The one-piece stepped seat provides adequate comfort and a firm cushioned backrest in true cruiser tradition has been added for the pillion.

Royal Enfield Thunderbird is equipped with single cylinder, 4 stroke 350cc engine that delivers a peak power of 18 bhp @ 5500 rpm. The engine has a constant vacuum carburetor which aids combustion and improves initial pick-up. The CDI ignition system of Royal Enfield Thunderbird eliminates cold start problems.

Royal Enfield Thunderbird's front suspension employs hydraulically damped telescopic forks and the rear suspension is outfitted with a short swing arm with five way adjustable shock absorbers.
Royal Enfield Thunderbird Technical Specifications
Engine
Type Single Cylinder, 4 Stroke, OHV, SI Engine, Air Cooled
Displacement 346 cc
Bore x Stroke 70 mm x 90 mm
Max. Power 18 bhp @ 5500 rpm
Max. Torque 27.5 Nm @ 3500 rpm
Transmission 5 Speed (left foot gear shift)
Ignition Digital TCI
Carburetor Constant Vaccum (CV)
Starting Electric Start - Optional
Dimensions
Ground Clearance 140 mm
Width 750 mm
Wheel Base 1370 mm
Length 2120 mm
Height 1080 mm
Tyres
Front 3.25 x 19 6/4 PR
Rear 3.50 x 19 6/4 PR
Electricals
System, Head Lamp 12V, 35 / 35 W
Brakes
Front Drum 7" Dia. Twin lead / Disc Brake 280 mm - Optional
Rear Drum 6" Dia. Single lead
Speed
Max. Speed 110 kmph
Suspension
Front Telescopic, Hydraulic Damping
Rear Swing Arm with Adjustable and gas filled shock absorbers

Monday, June 16, 2008

Operations

The power station operator has several duties in the electrical generating facility. Operators are responsible for the safety of the work crews that frequently do repairs on the mechanical and electrical equipment. They maintain the equipment with periodic inspections and logs temperatures, pressures and other important information on regular intervals. Operators are responsible for starting and stopping the generators depending on need. They are able to synchronize and adjust the voltage output of the added generation with the running electrical system without upsetting the system. They must know the electrical and mechanical systems in order to troubleshoot problems in the facility and add to the reliability of the facility. Operators must be able to respond to an emergency and know the procedures in place to deal with it.

Wind

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Wind turbines can be used to generate electricity in areas with strong, steady winds. Many different designs have been used in the past, but almost all modern turbines being produced today use the Dutch six-bladed, upwind design. Grid-connected wind turbines now being built are much larger than the units installed during the 1970s, and so produce power more cheaply and reliably than earlier models. With larger turbines (on the order of one megawatt), the blades move more slowly than older, smaller, units, which makes them less visually distracting and safer for airborne animals. However, the old turbines can still be seen at some wind farms, particularly at Altamont Pass and Tehachapi Pass.
Solar Power Discription:

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Solar

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A solar photovoltaic power plant converts sunlight into electrical energy, which may need conversion to alternating current for transmission to users. This type of plant does not use rotating machines for energy conversion. Solar thermal electric plants are another type of solar power plant. They direct sunlight using either parabolic troughs or heliostats. Parabolic troughs direct sunlight onto a pipe containing a heat transfer fluid, such as oil, which is then used to boil water, which turns the generator. The central tower type of power plant uses hundreds or thousands of mirrors, depending on size, to direct sunlight onto a receiver on top of a tower. Again, the heat is used to produce steam to turn turbines. There is yet another type of solar thermal electric plant. The sunlight strikes the bottom of the pond, warming the lowest layer which is prevented from rising by a salt gradient. A Rankine cycle engine exploits the temperature difference in the layers to produce electricity. Not many solar thermal electric plants have been built. Most of them can be found in the Mojave Desert, although Sandia National Laboratory, Israel and Spain have also built a few plants.