Making a Solar Stove

The Sun is the largest and the main energy source for our life, we can harvest solar energy freely and with simple technology.
There are various types of solar cooker that we can use to "harvest" energy of the sun, among others;

1. Box Cooker, mostly used in India.
   [IMG align="center"]http://i649.photobucket.com/albums/uu218/eghojansu/komat.jpg[/IMG]
   
2. Parabolic/concentrator cooker, designed as the concentrator of this type can generate very high temperatures, hot like fire, so it is very dangerous and requires extra attention for their use.
   Usually used for cooking in large scale, and this type of stove users mostly in China.
   [IMG]http://i649.photobucket.com/albums/uu218/eghojansu/komat2.jpg[/IMG]
   
3. Panel Cooker is a combination of parabolic cooker and box cooker. This type of stove is the most widely used because it has many advantages, such as hot temperatures, which produced no parabolic cooker so relatively safe, flat shape that is also safe for our eyes (because it is usually reflective parabolic solar cooker that is harmful to the eyes), easily produced with simple technology and low cost, and easily carried and stored.
   [IMG]http://i649.photobucket.com/albums/uu218/eghojansu/komat3.jpg[/IMG]
   

Now, let us make the Panel Cooker. Follow the instruction below.

1. Equipment and materials
   
   
   
   • Thick paperboard, ( 0.9 x 1.2 meters )
     
   • Aluminum foil, ( 0.3 x 3 meters )
     
   • Glue
     
   • Scissors or Cutter
     
   • Pencil and Ruler
     
   
   
   
2. Then, form paperboard into a pattern like below:
   
   [IMG]http://i649.photobucket.com/albums/uu218/eghojansu/komat4.jpg[/IMG]
   
   
3. After the pattern is formed and then cover with aluminum foil with glue that has been prepared, and do not forget to make two holes in the picture hook as a hook pattern as a place for collectors of sunlight.
   Then bundle pattern is formed above.
   [IMG]http://i649.photobucket.com/albums/uu218/eghojansu/komat5.jpg[/IMG]
   
   
4. After the stove Threaded perfect next step is to prepare the container for cooking foods, make sure the pot that we made as a place to cook is black, because black will absorb heat very well. Then, to optimize the absorbed heat and avoid heat wastage, in the cooking process should we use plastic to wrap the pans. According to Dr. Steven Jones of Brigham Young University, to be more optimal in cooking would be better if made a coaster for the pot which we will place it on the stove, placemats made with a height of 6 cm as shown below, in order to optimize both the reflected sunlight from above , side or from below the pan.
   [IMG]http://i649.photobucket.com/albums/uu218/eghojansu/komat6.jpg[/IMG]
   

Source:

• Harper, G.D.J., 2007, Solar Energy Project for the Evil Genius, New York, The McGraw-Hil.
  
• Solar Cooker; How to Make, Use and Enjoy 10th Edition, California, Solar Cooker International.
  
• Kamase(Keluarga Mahasiswa Sentra Energi)
  

Direct Link Forum: http://www.kaskus.us/showthread.php?t=4538437

Korea Successfully Create Translucent Cameras

Human desire to see objects that are not visible to the naked eye does not appear to be a problem today. As a real example, hobbies watching movies can be an opportunity to fulfill human desires that want to peep the life of others. Therefore, the scientific world continues to conduct research to resolve the demands of human life through the development of equipment that can be translucent.

South Korea recently succeeded in developing a camera that can be opaque through both the inside clothing or objects in the mist. Development of millimeter wave cameras for a second time in the world. A research institute in South Korea on October 19 and in the city of Yongin, Kyeonggi province, held a presentation about the ability MIRAE, Millimetre-Wave Imaging Radiometer Equipment, or some sort of camera that can detect millimeter wave so can see-through.

In the presentation, MIRAE succed to capture accurately the position and the outline of a car that was behind a thick screen. Meanwhile, ordinary cameras and infrared cameras failed to capture the position and outline of the car.

In addition, opaque camera capable of taking pictures was a real object that was in flames and smoke from fire and managed to detect a gun hidden in a shirt. According to these institutions, they managed to develop a camera that invisibility after devoting his efforts during the last three years. This is the world's second success.

Secrets of millimeter wave
Millimeter waves is a key element in the development of transparent camera. The theory of applying the use of opaque light waves outside the visible area that can not be seen or felt by humans. Through the process of millimeter wave image looks relatively long compared with the wave of visible light and infrared light, we can see objects that are in a state of vague due to obstructions.

Millimeter wave camera can take images of objects, through the acceptance of millimeter waves emitted directly from the object it naturally. Use this camera does not cause negative impacts to human health. Does the camera's infrared rays and X-ray which has long used in human life, capable of invisibility?

Rays that can penetrate the barrier
We can see transparently through changing the emitted infrared light from our body naturally becomes visible, such as infrared ray camera, although we can not see objects beyond the reach of the infrared rays and ultraviolet rays. Infrared light has long waves can penetrate clothing and dark fabric either to seek the position of the object. The function is now applied to smooth the SAR activities.

Plus, X-ray at the airport is used to detect what is hidden in the human body through the clothing in order to prevent the things that are not expected in the protection of passenger safety.

In a recent edition, the British science magazine New Scientist to introduce 10 products of science that can change the pattern of human life on a large scale in the next 30 years. In these products, there are tools we can use to see an object that is hidden, like a Superman.

In other words, the world of international science and technology is now fully committed to developing invisibility technology.

University of Utah research team, the United States succeeded in developing technologies that can pursue and capture human gestures or objects behind a thick wall with a radio transmitter devices without wires, by applying a vertical image retrieval method without cable, or RTI.

United States Army also successfully developed LifeReader technology, namely wireless equipment that can monitor heart rate and respiration at the same time against a group of humans.

Plus, an advanced technology was also developed to transfer the information collected by the mini digital camera on the glasses worn by blind people to the electrodes are grafted on the tongue was blind. In conclusion, in short while longer, the development of science. (gugling.com)