Ancient Egyptians Transported Large Objects over Wet Sand, Study Suggests According to a new study published in the journal Physical Review Letters, ancient Egyptians used a simple trick to make it easier to transport heavy colossi and pyramid stones by sledge – they moistened the sand. Drawing of a wall painting from the tomb of Djehutihotep, a semi-feudal ruler of an Ancient Egyptian province, 1880 BC. A person standing at the front of the sled is pouring water onto the sand. For the construction of the pyramids, ancient Egyptians had to transport heavy blocks of stone and large statues across the desert. They placed the heavy objects on a sledge that workers pulled over the sand. A multinational group of physicists led by Prof Daniel Bonn from the University of Amsterdam has hypothesized that Egyptians probably made the desert sand in front of the sledge wet.
Solar Tracker Circuit Kit Solar Tracker Circuit Kits from MTM Scientific, Inc Solar Tracking Kits, Motors, Sensors, Circuit Booklet and Photos of Customer Projects Español Aqui Photo of Solar Tracker Circuit Kit after assembly (Catalog #ST2) The Sietch Blog » Watercone – An Ingenious Way To Turn Salt Water Into Fresh Water The Watercone is an ingenious device that can take salty water and turn it into fresh water using only the power of the sun. The nice thing about this device is it is bone simple, uses the sun instead of fossil fuel, and is cheap to make and easy to use. The Watercone is surprisingly a cone, that you place over a pan of salty water (or over a marsh, or any damp ground) leave it out in the sun, water evaporates, the condensation trickles down the side of the cone, at the end of the day you flip it over, remove the cap at the top and drink the water. This device has the potential to really do a lot of good for a lot of people.
Vertical axis wind turbine Vertical-axis wind turbines (VAWTs) are a type of wind turbine where the main rotor shaft is set vertically and the main components are located at the base of the turbine. This arrangement allows the generator and gearbox to be located close to the ground, facilitating service and repair. VAWTs do not need to be pointed into the wind, which removes the need for wind-sensing and orientation mechanisms. Major drawbacks for the early designs (Savonius, Darrieus and giromill) included the significant torque variation during each revolution, and the huge bending moments on the blades. Later designs solved the torque issue by providing helical twist in the blades similar to Gorlov's water turbines. A VAWT tipped sideways, with the axis perpendicular to the wind streamlines, functions similarly.
Recycle a phone book into a pen organizer Spring is finally approaching, and with it comes a familiar sound… the thud of a new phone book landing on the front porch. In our area, Jo and I are inundated with as many as 4 or 5 new phone books every Spring, from different publishers all trying to compete in the advertising biz. Of course nobody needs that many phone books, and I usually just toss all but one of them in the recycling bin, but this year I decided to try to upcycle one of them into something fun. I managed to turn one into a quirky and unique pen/pencil organizer that’s a real conversation piece on my desk! Cut the phone book
Solar Tracking Solar Collector, Passive Tracking with improved I Passive Solar Tracking Having the maximum amount of absorber area directly facing the sun causes superior solar collector performance. Because of their round design, Solar Panels Plus evacuated tube collectors are able to passively track the sun, meaning that they are always pointed directly at the sun and can absorb solar thermal energy evenly all day long. This is important, particularly if the heat is needed throughout the day without using a large thermal storage system.
C:\IMAGES\OMNIPAGE\DATA\hm2.htm In collaboration with Norman Rostoker from UC at Irvine, we have designed a novel type of fusion reactor, the Colliding Beam Fusion Reactor (CBFR). It uses protons (p) and boron-11 (11B) for fuel. Fusion reactions produce only three helium-4 (4He) nuclei, and nearly 9 million eV energy. Savonius wind turbine Savonius wind turbine Savonius wind turbines are a type of vertical-axis wind turbine (VAWT), used for converting the force of the wind into torque on a rotating shaft. The turbine consists of a number of aerofoils, usually—but not always—vertically mounted on a rotating shaft or framework, either ground stationed or tethered in airborne systems. Origin The Savonius wind turbine was invented by the Finnish engineer Sigurd Johannes Savonius in 1922.
Coffee Filter Roses Back in my failed former days as a window dresser, I got some good advice from Tanja, the Grand Dame of the cosmetics department. Originally from Romania, Tanja was widely renowned for her eyebrow waxing skills and had arrived at a point in her career when she only had to take one appointment a day, then happily dragged it out all afternoon. Most of the time was spent smoking and laughing and singing gypsy folk songs about beet salad, then more smoking and dispensing advice about important things like men, business, and unwanted hair. Of the many things I learned from Tanja, there are three golden nuggets that stand out; Solar Thermal Technology for solar hot water, solar building hea Solar thermal is a technology designed to harness sunlight for its thermal energy (heat). This heat is often used for heating water used in homes, businesses, swimming pools, and for heating the insides of buildings (space heating). In order to heat water using sunlight, a solar thermal collector heats a fluid that is pumped through it. As the fluid is pumped through the collector, the fluid becomes heated. The now heated fluid then is pumped out of the collector and through a heat exchanger. Heat exchangers are usually comprised of copper, and are normally found inside a solar storage tank.
Windbelt Micro-wind, 10 Times Cheaper Wind Energy!! [Run time: 2:05 min] I hope you enjoy this short video of Shawn Frayne, a young inventor that has created this device to generate, on the micro-scale, energy for LED lights and radios in developing countries. This is the first approach that uses aeroelastic flutter to create super cheap electricity. We’re talking about changing the way wind energy is harvested and captured. Frayne won a 2007 Breakthrough Award from Popular Mechanics, and he deserves it. This incredible technology is 10-30 times more efficient than the best micro-turbines. So, Frayne hopes to fund third-world distribution of the Windbelt through sales in first-world applications.