Monday, August 8, 2016

Interactive Dynamic Video and Vibrations



Maybe in a few months from now, the concept of Interactive Dynamic Video (IDV) might be another part of Smart Phone technology. It might either be embedded on the hardware or a software application that can be installed especially that 'Virtual Reality' and 'Augmented Reality' is a thing today.

As you might have watched from the video, we can predict and simulate the movements of an object by simply recording a short clip through a camera. The IDV methodology that they have applied is through sampling the vibration of an object. Everyday in our lives we feel vibrations, it comes from different forces of energy which causes everything around us to shake. Once these source of energy has stopped, the vibration momentarily weakens until it is completely faded. We can think of this natural law happen when we drop an object on a stale water that eventually produces ripples of waves and fades out into the open. Given these rate of how vibrations move and fades, we can mathematically predict at what time it will fade and how long a vibration will take effect if applied  with a given amount of force. Calculating by hand to simulate such effect is a tedious and slow work thus using a computer's fast calculation ability would be the best approach.

Although in reality, there are many factors that needs to be considered in order to produce a more accurate simulation of vibrations. For example, the rate of vibrations are also affected by the properties of an object such as its weight, shape, size, and so on. Another example is when an object produces a vibration because it got moved by another vibration (pretty much like a domino effect). Whatever the amount of energy is applied, naturally vibration will fade as it travels further. Moreover, the effect of vibration are different in every kind of an object.

The above video however does not exactly state the algorithm and factors they have used to make videos interactive, but one thing for sure is that they studied and simulated vibrations very well.

Friday, August 5, 2016

Self Cleaning Toilets and UV Rays



If you ever have wondered which places are the most naturally sanitized locations on earth then most probably you have heard someone say it's the 'beach'. Whenever we think of 'beaches', we think of a warm sunny weather. Lately, people are using Ultra Violet (UV) light as a self cleaning mechanism. Naturally, UV lights are produced from the sun and these radiation has enough energy to break chemical bonds which is a process called ionization. UV rays are radiation that can be damaging to the tissues which is why we get sunburn under the sun. If we look at some hierarchy,  tissues are made of cells, cell are made of molecules, and molecules are made up of atoms that are chemically bonded. When the ionization process comes in, these bond of atoms breaks apart, and eventually without that bond then the tissue is considered dead or have dissolved. Although germs are not mainly made of tissues but they are still made up of cells so an amount of UV rays applied to them gets them killed. Of course, we don't expect these self-cleaning devices to be using the UV light from the sun since the sun only appears at a limited time during the day. They can be artificially produced like the technology they use on tanning booths, lamps, fluorescent and incandescent stuff.

Tuesday, August 2, 2016

Electrical Energy and Wind Turbines


Wind has always been one of the effective ways to produce electrical energy. Technically wind does not directly produce electrical energy but goes through a process. Wind are always in motion, and everything that moves produces what we call a kinetic energy. Everyday in our lives we see lots of these kinetic energy such as from wind, river, and specifically anything that has motion. To further multiply the effect of this kinetic energy, wind turbines have blades designed where wind goes through which makes it spin. Depending on the the design efficiency and effectiveness of the blades, they can spin for a long time with a small amount of wind. While spinning, this again produces a larger amount of energy called a mechanical energy (kinetic energy + energy produced by the blades in motion). The mechanical energy goes through a rotating mechanical device called a magnetic rotor. The rotor which is made of loops of magnetic copper wires produces electrical charges while it rotates. Most wind turbines has a transformer that increases the electrical generation. The electrical energy generated then travels through underground cables going through a station where electricity is stored for use later on.

The process can also apply to anything that produces kinetic energy. However, wind is the best source of kinetic energy because they are not limited leading us to question what makes a wind? It has been discovered that warm air rises and cold air drops (because they're heavier). From the bottom, warm air rises because they get heated by the sun or the land then they get cooled down as they reach the top then flows back again downward and pushes the other air on the bottom and the cycle repeats. While going through the cycle, air is being pushed making it flow which we can eventually feel and call it a wind.