Are you a eco-green lover/supporter? If you are, then this “CallABike” concept will be a good choice to show your concern to the environment. A Germany eco-concept company, Die Bahn offers a service named “CallABike” system. This is the rental process for “CallABike”: A customer calls the company via touch-tone and he/she will be provided four-digit number to open the bike. The customer will get another verification call after the lock had opened.
As the global fuel price keeps rising like a rocket, it is always a pleasure to find some alternative power supply. The wind energy can be considered as one of the clean, eco-friendly and free energy. The main problem is natural wind did not always blow at the same speed and this will gradually affected the efficiency by using wind powered generator. Winds normally blows at intermittent condition, where sometimes the speed is high or low, also sometimes it will eventually changed the direction as well. For overcome this matter, we can create an Intermittent Wind Powered Generator which it can effectively contribute energy even with intermittent wind. The working diagrams of intermittent wind powered generator: