BrainKing - Diskutaj forumoj (Politics)

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8. Aŭgusto 2009, 22:21:14

Übergeek 바둑이

montri mesaĝojn de ĉi tiu uzanto | montri fadenon | ligilo

Temo: Re: China and change

(V):

It is good that we recycle plastics. The real problem is not so much the polymers. Polyethylene, polystyrene and other thermoplastics can be melted and recycled. Thermosetting plastics like polyester can be reused for upholstery stuffing, carpets, etc.

The real problem with plastics is UV light degradation and all the plasticizers and additives.

As UV light degrades plastics, small amounts of hydrocarons are released, and some of those have biological activity. As the plastics degrade the plasticizers leach out and those chemicals have biological activity too.

There is a big push now to get rid of plasticizers like BPA because they have estrogenic activity and they can affect fetal and child development as well as increase chances of breast cancer and prostate cancer. In animals they can cause problems too, such as thin and brittle egg shells in birds and they can inhibit reproductive activity in amphibians and reptiles.

Ideally, recycling improvements, changes in legislation, and technological changes can make things better.

8. Aŭgusto 2009, 23:07:50

Mort

montri mesaĝojn de ĉi tiu uzanto | montri fadenon | ligilo

Temo: Re: China and change

Modifita de Mort (8. Aŭgusto 2009, 23:10:07)

Übergeek 바둑이: Ok... with plastics it's not perfect... but it's a whole lot better then ten years ago.. even 5!!

The amount of stuff that is now recyclable plastic wise by the markings is about 90% of what we get through our household.

Funny technology.. just saw a program last night about how lucky WWII ended in 1945. The German boffins had cracked 'stealth' technology with speed that would have broken the British radar system and would have given time for the development of the Nazi A-Bomb and a jet fighter style wise akin in shape to the American Stelth bomber. They could have nuked the USA (or any country within range of the bomber) and no-one had the technology to stop them.

The guys who build the radar models for profile testing at the Stealth plant were so happy to at last to show of their skill and dedication in the reconstruction of the German Stealth fighter/bomber, as normally it's all .. hush, hush.

http://www.flightglobal.com/blogs/the-dewline/2009/06/the-aircraft-that-could-have-m.html
A link to a page on the German 2-29