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Messages - newtech2008

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The choice of matrix can have a profound effect on the properties of the finished composite. One common plastic for this application is epoxy, and materials produced with this methodology are often generically referred to as composites. One way of producing graphite epoxy parts is by layering sheets of carbon fiber cloth into a mold in the shape of the final product. The alignment and weave of the cloth fibers is carefully selected to optimize the strength and stiffness properties of the resulting material. In demanding applications, all air is evacuated from the mold, but in applications where cost is more important than structural rigidity, this step is skipped. The mold is then filled with epoxy and is heated or air cured. The resulting stiff panel will not corrode in water and is very strong, especially for its weight. If the mold contains air, small air bubbles will be present in the material, reducing strength. Most composite parts are manufactured by draping cloth over a mold, with epoxy either preimpregnated into the fibers (also known as prepreg), or "painted" over it. Hobby or cosmetic parts are often made this way, as are high performance aerospace parts. High performance parts using single molds are often vacuum bagged and/or autoclave cured.

Biomedical Devices / Re: New device of Pumps
« on: August 16, 2008, 11:55:00 AM »
This valve opens and closes to let the hydraulic fluid flow from one side of the artificial heart to the other. When the fluid moves to the right, blood gets pumped to the lungs through an artificial ventricle. When the fluid moves to the left, blood gets pumped to the rest of the body.
Wireless energy-transfer system - Also called the Transcutaneous Energy Transfer (TET), this system consists of two coils, one internal and one external, that transmit power via magnetic force from an external battery across the skin without piercing the surface

I am concerned obviously about the structure collapsing, but also, another issue. The ceiling has tested positive for high amounts of lead paint. It has been temporarily "abated" with a layer of fresh paint. This I feel is not sufficient, given the structural issues. To say that a layer of paint is strong enough to support a ceiling from cracking, is to me, a bit hard to believe - but that is in fact the sort of response I am receiving thus far. Lead paint can release lead dust when the painted surface is disturbed in some fashion, by friction, a crack, etc. There is already one crack in the ceiling, although it has been covered with new paint. Nonetheless, the crack in the ceiling suggests a structural issue, and suggests that another crack could happen again.

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