Monday, December 13, 2010

Old Fashion Girdles And Stockings

cause rain


A team of researchers from France, Germany and Switzerland have used a laser technique to bring rain in the atmosphere. This technique can be used to study the formation of water droplets in clouds and could even offer a new method to induce precipitation.

weather control is an ambition of mankind since time immemorial. In the course of human history have made enormous efforts to find ways to make rain. The most recent attempts to promote rainfall or eliminate fog have been based on the use of airplanes or rockets to spread particles of silver salt or dry ice in the clouds that serve as "ice cores" around which can be form raindrops.

"This is the first experiment to show that a laser can cause condensation," said Dr. Kasparian. The team members are confident that this laser technique can be used to modify the weather in a particular area. "The reaction we cause is the first step in the formation of rain and we anticipate the possibility of replacing the techniques currently in use," he said.

The authors sought to mimic the function carried out by the dust and pollen particles as seeds of raindrops "in the process of condensation using ions generated laser. First, directed laser pulses to clouds in an experimental chamber. Ions were used as "hooks" for moisture and could be seen a trail of condensation along the path of the laser. The drops were too small to cause a real precipitation, but rather it was a light mist.

Then the scientists went Teramobile laser pulses directly to the sky a cold afternoon when there was a humidity around 90%. Then they took measures LIDAR (light detection and ranging) to monitor the concentration of aerosols in the atmosphere and detect changes in weather conditions: visibility worsened, the humidity rose to 93% and the concentration of aerosols of water increased.

In this latest research, led by Dr. Jérôme Kasparian of the University of Geneva (Switzerland), we used a special instrument called terawatt femtosecond laser and Teramobile to be issued extremely powerful laser pulses and ultrashort to generate "self-guided filaments ionized." Ions induced a condensation, first in a cloud chamber, and then in the sky over the German capital, Berlin, a cool autumn afternoon. The scientists examined the mechanisms behind this process through laboratory experiments, including tests of photo-oxidative chemistry and a study of electrostatic effects.

"We have demonstrated experimentally that it can promote condensation of water through self-guided filaments generated by ultrashort laser pulses, even in undersaturated atmosphere," the study concludes. "This phenomenon leads to an exciting new tool for remote characterization of the moist air and cloud formation. It might even provide a means to facilitate or even cause precipitation continuous operation using lasers instead of rockets. "

scientists perfect the technique are proposed to promote the formation of rain.

Sources:

http://www.laflecha.net/canales/ciencia/cientificos-usan-una-tecnica-laser-para-provocar-lluvia-a-voluntad/ /

0 comments:

Post a Comment