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Direct piezoelectricity of some substances like quartz, as mentioned above, can generate thousands of volts (known as high-voltage differentials).
Probably the best-known application is the electric cigarette lighter: pressing the button squeezes an piezoelectric crystal, and the high voltage thus produced ignites the gas as the current jumps over a small spark gap. The portable electrical sparkers used to light gas grills or stoves work the same way.
A similar idea being researched by DARPA in the USA in a project called Energy Harvesting, which includes an attempt to power battlefield equipment by piezoelectric generators embedded in soldiers' boots.
A piezoelectric transformer is a type of AC voltage multiplier. Unlike a conventional transformer, which uses magnetic coupling between input and output, the piezoelectric transformer uses acoustic coupling. An input voltage is applied across a short length of a bar of piezoceramic material such as PZT, creating an alternating stress in the bar by the inverse piezoelectric effect and causing the whole bar to vibrate. The vibration frequency is chosen to be the resonant frequency of the block, typically in the 100 kilohertz to 1 megahertz range. A higher output voltage is then generated across another section of the bar by the piezoelectric effect. Step-up ratios of more than 1000:1 have been demonstrated. An extra feature of this transformer is that, by operating it above its resonant frequency, it can be made to appear as an inductive load, which is useful in circuits that require a controlled soft start. A detailed analysis can be found here
Fundamentals of Power Harvesting
The piezoelectric effect exists in two domains, the first is the direct piezoelectric effect that describes the material’s ability to transform mechanical strain into electrical charge, the second form is the converse effect, which is the ability to convert an applied electrical potential
into mechanical strain energy.
One of the most effective methods of implementing a power harvesting system is to use mechanical vibration to apply strain energy to the piezoelectric material or displace an electromagnetic coil. Power generation from mechanical vibration usually uses ambient vibration
around the power harvesting device as an energy source, and then converts it into useful electrical energy, in order to power other devices.
the intended location of the power harvesting system must be identified so that its placement can be optimized and the excitation range realized to allow for tuning of the power harvesting device. By tuning the power harvesting medium with the structure the excitation can
be made to maximize the strain of the piezoelectric material using the concept of resonance.
Originally posted by Asktheanimals
What evidence is there of water having flowed in or through the pyramids?
Originally posted by Mr_skepticc
Your absolutely wrong from the start by saying that pyramids were not burial tombs because no mummys were never found there. Wrong, what about the sarcophagus that were inside everyone of the pyramids? Sure the mummys were taken out by grave robbers, but they couldn't get those big ole sarcophagus out of there could they. The great pyramid was built as a tomb for fourth dynasty Egyptian Pharaoh Khufu, there are three known chambers inside the Great Pyramid. The only object in the King's Chamber is a rectangular granite sarcophagus. The lowest chamber is cut into the bedrock upon which the pyramid was built and was unfinished. The Queen's Chamber and King's Chamber are higher up within the pyramid structure. The Great Pyramid of Giza is the main part of a complex setting of buildings that included two mortuary temples in honor of Khufu. People like to make things bigger than what they truly were, but the bottom line is this, they were burial tombs, created for their beloved pharoah.
All this non-sense high thinking about they were a machine, they were built by aliens, they hold special powers, all nuts..They were built by the people of Giza, lot of hard work, but determanation for the beloved one. People can come up with all the crazy theroy's they want, however, it will not change the fact that the pyramids were built to hold the corpse of their great leader!
Originally posted by Ridhya
Also I think you sound like you care more about credit for 'discovering' this than you do about getting the message out, so understand why someone else said that... (maybe you're not but you were accusing them of jealousy and say 'IM the first to discover this')...
I will disclose to thee a command of thy Lord, since thou art his royal scribe, (since) thou art despatched to convey great monuments for Horus, the Lord of the Two Lands. For thou (in sooth) art the clever scribe who is at the head of the soldiers! -
There is made a ramp of 730 cubits, with a breadth of 55 cubits, consisting of 120 compartments(?), filled with reeds and beams, with a height of 60 cubits at its summit, its middle of 30 cubits, its batter(?) 15 cubits, its base(??) of 5 cubits. The quantity of bricks needed for it is asked of the commander of the army. All the scribes together lack knowledge among them(?). They put their faith in thee, all of them, saying: "Thou art a clever scribe, my friend! Decide for us quickly! Behold thy name is famous; let one be found in this place (able) to magnify the other thirty! Let it not be said of thee that there is aught that thou dost not know! Answer us (as to) the quantity of bricks needed! Behold its measurement(??) are before thee; each one of its compartments(?) is of 30 cubits (long) and 7 cubits broad."
A series of round holes about 40 centimeters in diameter were cut into the rock around the pyramid ....These holes are noted by Goyon and Maragioglio and Rinaldi as being connected with the laying out of the pyramid.11 Stadelmann believes that these holes could be bases for trees based on references observed in some in private tomb paintings.12 Lehner took the approach of Goyon, and Maragioglio and Rinaldi, and added that they used these holes to make the layout of the base of the pyramid as a square base.
13 These holes are set at regular intervals and form lines which run parallel to the sides of the pyramid. The best indication for the reason behind these holes is for stakes that carried a line used as a reference, by the builders, as they formed the base of Khufu's pyramid from blocks of limestone, or in the case of Khafre's pyramid, from granite. These fifteen-ton blocks are marked so as to define the center axis of the pyramid's faces and diagonals. There are also trenches that infer the infusion and drainage of water during and after the leveling operations.14