06/01/2012

Is it true that smaller cells integrated Photovoltaic?

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It is possible to integrate solar cells based on real small sizes on mobile devices. You can mini-cells, which are integrated into the rear of the unit. These cells are primarily mono-crystalline (for better performance). It may in the future of high performance solar cell type multi-junction to share the spectrum, to increase energy capture. These cells reach an efficiency of 40%!


Viber for Android: free VoIP calls over 3G and WiFi


The application Viber is one of the most commonly downloaded applications, and free for calls and text messages between iPhones. After a beta version for Android, Viber here that the application for Android was officially launched on 21st July, 2011. What is this application for use nationally and internationally?


Viber for Android: Better than Skype to make calls and free SMS


If Skype is one of the most effective ways to send free phone calls or chat with contacts Viber revolutionized the world of free communication via VoIP. In fact, unlike Skype is not Viber appointment, no profiles are created: Once you have downloaded the application, you can contact to your contacts with this application. Another advantage of Skype you can call or SMS message to all your contacts on the phone with Viber Viber, 3G or WiFi.


After his success on the iPhone is the long-awaited arrival of Viber on Android finally announced


Nanotechnology. Progress or Peril?


Nanotechnology, what is it?


To be very simple, we can say that nanotechnology is the technology of the infinitesimally small. The prefix "nano" refers to a nanometer, which corresponds to a billionth of a meter or one millionth of a millimeter. A nanometer is 30.000fois smaller than the diameter of a hair. This is the scale of atoms and molecules. This is the heart of the matter.


Where can I find one of the nanoparticles?


In many objects of daily life. AFSSET identified 246 manufactured products: the toothbrush, salt, no history of teddy bears and tennis rackets. For its part, the table CNDP 800 objects from everyday life. Some may contain substances to prevent odors. Similarly, "sunscreens are titanium dioxide encapsulated in aluminum," said Fabien Thomas, director of research at CNRS.


Why does it take you interested?


Since it was found that the nanometer scale, metals, materials and objects, properties and behavior significantly from those it with the standard size. By controlling the organization of atoms and molecules, man can create objects with new properties and more efficient. For example, gold as a metal inert gas in particular is known, the state nanoscale, chemically very reactive. These new physico-chemical properties and open a wide field of research.


For what?


The aim of nanotechnology is to produce objects or materials 100nanomètres below. These nanomaterials are nanoparticles called, which is in contrast to natural origin, such as very fine particles, formed on the goal. Example: Carbon Nanotubes: When in the wild, the carbon atoms organize themselves spontaneously to give the diamonds, the researchers introduced a new type of carbonaceous material. Their stiffness is typically 100 times higher than that of steel.


What is the point?


All sectors will eventually be affected by nanotechnology. The development will they say to change our lives. The possibility of reducing the size of objects while increasing their performance promises products smaller, lighter, more powerful and effective. In the medical field, many applications are considered: the nanotubes and nanoparticles could be used to provide treatment directly to diseased cells to be. In transport, nanotechnologies are expected to develop stronger and lighter materials.


What kind of products?


It is estimated that already contain more than 500 consumer products nanoparticles. Some examples are: insalissables textiles with a film of silver nanoparticles, self-cleaning glass, as thin films of titanium oxide or toothpaste with calcium phosphate nanoparticles are deposited to fill the tiny cracks in the teeth covered. The main sectors are currently involved in nanotechnology consumer products, health and sports (clothing, sports equipment, cosmetics, body care, sun protection), electronics and computers, applications and other surface coatings foodborne.


What are the risks?


Many questions arise about the dangers of nanotechnology, including nanoparticles, health and the environment. What, for example, the toxicity of some nanoparticles, which are known to overcome biological barriers, of course. "Until she asbestos," some say. Associations such as the Friends of the Earth called for a moratorium on the information available. Ethical issues also arise, including nanotechnology could be very effective in the pursuit of the people they are not an additional risk of invasion of privacy?


The researchers are cautious about the risks. "This is not reactive, gold nanoparticles are non-toxic reagents. You are a potential for toxicity, "said Fabien Thomas. The first danger is that these nanoparticles can penetrate the body's cells. "We have no certainty, but it could be found in sunscreens penetrate the skin," he said.


Environmental hazards


As in the human body, and yet nothing is proved that page. But talk about the problem AFSSET version in the environment. "Under the laundry odorless nanoparticles in nature and fish," said Fabien Thomas. With less than 10 years of experience in this area, it is difficult to move forward with confidence to real risks. It should be traceability and labeling requirements associated.


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