Sun cells running a Japanese city

Sun power is the absolute largest known source of continous free power on earth, but we are currently quite bad at harvesting it.

The Danish news channel, Politiken, presented a news reel today (by Clavs Sylvest) on the Japanese Ota City that is being fully self sufficient in sun powered electricity.

This is a goverment sponsored program including about 500 homes. Each home has been given sun cells. The project is a national experiment testing how to avoid power cuts with the use of sun power. The house owners are allowed to sell the electricity back to the power compagny when producing excess electricity. This amounts to about 50 US dollars/month per house, on top of the electricity saved. However, sun cells are still expensive to produce and buy, and not using the electricity optimally due to reflection.

Good news though, Rensselaer Polytechnic Institute (US, also source of foto) has figured out how to coat the sun cells with tiny hairs that capture the otherwise reflected sunlight, much like hairs on a polar bear. The improvement allows the cells to harvest close to 100% of incoming rays, in contrast to about 67% now. So let us hope this will arrive on the market one day, that goverments will support people buying them, and that power compagnies will buy surpluss energy.

The video on Ota City can be watched here: http://politiken.tv/nyheder/udland/article597272.ece (in Danish)
The article on the new sun cells: http://ing.dk/artikel/92983-beklaed-nutidens-solceller-med-nanohaar-og-faa-50-procent-ekstra-energi (in Danish)

The Back Shed - Open Science in use

Looking for sources of information on initiatives that involved other people I entered The Back Shed. This website is very close to my idea of Open Science in practice. I will try to break down into parts how.

Summary: The Back Shed is a channel for "publishing" how a few windmill enthusiasts building effective windmills, improvements, and expansions, mostly from spare parts. But not only that - they involve others in projects through their website, and allow them to give ideas to solving problems - returning the result on the website.

Economy: The website use Goggles AdSense and thus gives a little project money in return for people using the listed suggestions for windmill parts by Google.

Blue prints: the site offer detailed, step by step instructions how to replicate their results.

Forum: An open forum for discussing various projects and concepts is present.

Control: The site is run and maintained by the group.

Alchemist or Scientists: These are enthusiasts, making improvements to industrial designs as well as from scrap. They supply technical information and prints, but the method is trail and error, not so much scientific. So though they are not green stamped representatives of intellectual property But they do make things work - cheap, easy, and better for anyone it seems.

Interactivity: The linkage to a global idea network is lacking.

Ultraviolet light in the environment of domestic animals as method of limiting infection with parasites eggs (a defensive publication)

What is a defensive publication? It is a publication of an idea, or method, that prevents other from claiming the intellectual rights to it (such as a patent), because the idea no longer is "original".

Background: Ultraviolet light (UV) is harmful to living organisms. Our atmosphere and clouds, protects us from the major exposure produced by the sun. Besides being burned by the rays, the light can also penetrate tissue, enter cells, and damage DNA ("nicking" it), making survival of organisms difficult (eg. skin-cancer). Basically, what it takes to kill or weaken an organism with UV-light depends on the intensity, exposure time, and the spectrum used of the light. The smaller the organism, the less UV-exposure necessary to kill it. This is well known, and is widely used in many fields as a sterilizing procedures. It is also applied to water borne parasites such as Giardia and Cryptosporidium with great success. UV-light is a natural limiting factor of egg shedding parasites, who in most cases require shade, moisture, and normal temperatures to develop and survive.

Parasite eggs: Many parasites, both protozoan (one celled) and helminths (worms), have a part of their life cycle outside the animal, either as a worm or egg. The success of a parasite depends on whether new animals pick up these eggs and get infected. Good hygiene can limit these eggs in the environment, but it is often difficult or neglected, especially in animal production.

Method: The novelty of this idea is to use UV-light directly on the environment (in the farm) of the animals (not on the animals), either killing or weakening the infection potential of parasites picked up from surfaces. The tool is simply identical to a flashlight with UV-light bulb of the right intensity, held over the surfaces the animal comes in contact with.

Limitations: UV-light does not penetrate deeply into for example faces on the ground. The effect is therefore limited to surfaces.

Extra benefits: Parasites with damaged DNA, will cause a weaker infection than normal, and possibly increase the chance of the animal acquiring immunity to it. Works on other free living pathogens too such as fungus, virus, and bacteria.

Warnings: UV-light is harmful to the eyes, and skin under longer exposures! Small amounts of ozone (O3) is created when using UV-light, but quickly (minutes) reconverts to oxygen (O2). Ozone creates radicals that could act on the environment. Realistically, in a place like a farm, with air flow, this most likely will not cause any problems.