One of the latest inventions in the field of light emitting devices might change the way people light their homes and design clothes. The device represents a thin film of plastic able to conduct electricity and create solar power.

Scientists working on the international project are looking forward to bring the organic light emitting devices to the masses. Thus the invention could significantly cut costs by billions of dollars each year.

Due to the fact that the organic light emitting devices are very thin and flexible, electronic display screens could be easily created on nearly every material, thus, for example, clothing could, for the first time in history, display specific electronic information.

There are various ways of using the this OLED, like for example change the color of clothes, beer can would be able to display various sports results. In addition the OLED is much more efficient than the light bulb used today.

Currently these devices are applied in mobile phones and MP3 players. However, such OLED is not quite reliable for large TV or computer screens.

In order to make the device more efficient so later to launch it to mass market, the international consortium of researches, Modecom, headed by the University of Bath, United Kingdom, started a three-year project which will cost about $1,700,000.

Modecom comprises 13 groups from 9 universities and two companies. There are three groups from the United Kingdom, six groups from the United States and one group from China and one each from three European countries including Belgium, Italy and Denmark. Only the European countries and China will receive financial aid from the European Union.

.Invented in Turkey and patented byNanopool, a German company, the spray-on liquid glass might become one of the most useful inventions in the field of nanotechnology. The product was tested at the Saarbrücken Institute for New Materials. Currently the representatives of the German company are in UK negotiating with several firms and the National Health Service on the widespread use of the liquid glass.
It is worth mentioning that the invention istransparent and non-toxic. The liquid glass can protect any type of surface from damages caused by water, UV radiation, dirt, heat, and bacterial infections. Besides, it is flexible and breathable, which means that the liquid glass can be applied on plants and seeds as well. The invention was tested in vineyards where researchers found that the spray considerably increases the resistance of plants to fungal diseases. The trials also showed that the sprayed seeds grew faster.
The main ingredient used in the liquid glass is silicon dioxide that is obtained from quartz sand. Depending on the type of surface that is to be covered, researchers can add water or ethanol to the spray. Scientists say that their latest invention boasts a long-lasting anti-bacterial effect. The spray produces a coating that is just 100nm thick. This coating can be easily cleaned using water or a damp cloth.




Source : http://www.infoniac.com/science/latest-invention-spray-on-liquid-glass-that-can-cover-any-surface.html

circular motion

Uniform circular motion can be described as the motion of an object in a circle at a constant speed. As an object moves in a circle, it is constantly changing its direction. At all instances, the object is moving tangent to the circle. Since the direction of the velocity vector is the same as the direction of the object's motion, the velocity vector is directed tangent to the circle as well




An object moving in a circle is accelerating. Accelerating objects are objects which are changing their velocity - either the speed (i.e., magnitude of the velocity vector) or the direction. An object undergoing uniform circular motion is moving with a constant speed. Nonetheless, it is accelerating due to its change in direction. The direction of the acceleration is inwards


n object moving in a circle is experiencing an acceleration. Even if moving around the perimeter of the circle with a constant speed, there is still a change in velocity and subsequently an acceleration. This acceleration is directed towards the center of the circle. And in accord with Newton's second law of motion, an object which experiences an acceleration must also be experiencing a net force.


The direction of the net force is in the same direction as the acceleration. So for an object moving in a circle, there must be an inward force acting upon it in order to cause its inward acceleration. This is sometimes referred to as the centripetal force requirement





Observe in the animation that the passenger (in blue) continues in a straight-line motion for a short period of time after the car begins to make its turn. In fact, the passenger follows a straight-line path until striking the shoulder of the driver (in red). Once striking the driver, a force is applied to the passenger to force the passenger to the right and thus complete the turn.


source
http://www.physicsclassroom.com/Class/circles/u6l1c.cfm

Electrical charges

Electric charge is a physical property of matter which causes it to experience a forcewhen near other electrically charged matter. Electric charge comes in two types, calledpositive and negative. Two positively charged substances, or objects, experience a mutual repulsive force, as do two negatively charged objects. Positively charged objects and negatively charged objects experience an attractive force. The SI unit of electric charge is the coulomb (C)


Charge is the fundamental property of a matter that exhibit electrostatic attraction or repulsion over other matter. Electric charge is a characteristic property of many subatomic particles. The charges of free-standing particles are integer multiples of the elementary charge e; we say that electric charge isquantized. Michael Faraday, in his electrolysis experiments, was the first to note the discrete nature of electric charge. Robert Millikan's oil-drop experiment demonstrated this fact directly, and measured the elementary charge.

positive electric charge

negative electric charge

Charge is the fundamental property of a matter that exhibit electrostatic attraction or repulsion over other .

resources

http://en.wikipedia.org/wiki/Electric_charge

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Mechanisms of reflection

In the classical electrodynamics, light is considered as electromagnetic wave, which is governed by the Maxwell Equations. When light falls on the material, the electrons in the material oscillate with the electric fields and emit electromagnetic waves. The reflected light is the combination of the incident wave and the remitted waves.

In case of dielectric (glass), the electric field of the light acts on the electrons in the glass, the moving electrons generate a field and become a new radiator. The refraction light in the glass is the combined of the forward radiation of the electrons and the incident light and; the backward radiation is the one we see reflected from the surface of transparent materials, this radiation comes from everywhere in the glass, but it turns out that the total effect is equivalent to a reflection from the surface.

In metals, the electrons with no binding energy are called free electrons. The density number of the free electrons is very large. When these electrons oscillate with the incident light, the phase differences between the radiation field of these electrons and the incident field are π, so the forward radiation will compensate the incident light at a skin depth, and backward radiation is just the reflected light.

In the quantum-mechanical interpretation, light waves incident on a material induce small oscillations of polarisation in the individual atoms, causing each atom to radiate a weak secondary wave (in all directions like a dipole antenna). All these waves add up to specular reflection and refraction. Light–matter interaction in terms of photons is a topic of quantum electrodynamics, and is described in detail by Richard Feynman in his popular book QED: The Strange Theory of Light and Matter.