If the water tank is below this level, the team will not have enough pressure to operate and does not heat the water. If the water tank is above this level will create greater pressures to supporting the team and must incorporate an automatic float. Tank or solar hot water tank has a series of holes along it, where you place the evacuated tubes. The tube when exposed to sunlight reaches temperatures above one hundred degrees Celsius, the heat is transferred to water containing the tube inside the hot water loses density and weight so it tends to rise naturally to thermo tank, while cold water tends to fall within the evacuated tubes, as it has greater density and weight. Water movement is performed without pump and requires no electrical or mechanical components, this makes the equipment more reliable, easier to maintain and more durable.

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Then several contributions of researchers in complexity have emerged. But it was not until the eighties for a real resurgence of interest in the subject takes place. Thus there are different theories of complexity in the literature as the theory of complex adaptive systems with the work of Holland (1995) that each entity behaves according to local rules, not on a coordinated plan of all, the theory co-evolutionary Mark Kelly (1997) in which entities interact to create a form emerging order, the theory of complexity catastrophe or self-critical organization.

Christensen et al (1991) and Back (1996) where they stress that the size of an event is inversely proportional to its frequency, chaos theory Hadmand (1898) and Lorenz (1963) where “a small cause can have a big effect” and finally, the theory of self-organization with the work Nonaka (1988) and Nystrom et al (1976) emphasis on learning and offering a more faithful to the management of organizations.

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The manufacturers, whose products are available even in Germany offer up to eight different types of Bogiebandern. Because they and the tire width, as well as their profile must be exactly matched, the product variety is astonishing and reaches a three-digit number respectively. Alone the eco-track”by the leader of Olofsfors is available in 45 different versions. In addition, that also the distance between the vehicle frame and tires must be observed: the band is too wide, is on the frame it hang and cannot be used. It is therefore very important to comply with the ordering process of the individual manufacturers, just to not accidentally purchase the wrong band.

You must to think about exactly which grounds the tape should be used. At a cost between 4,000 and 9,000 euros, not many foresters provide according to dealer information two pair Bogiebander to. Their durability very depends on the soil conditions: each abrasive it is, such as sandy soils, the higher the wear is. About 6,000 working hours apply as a rule of thumb, then they are worn. Bogiebander can be, worked through a time what will cost around 2,500 euros.

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