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Blue-ray Disc

Written in 28-11-2009 by | No Comments

An optical disc storage medium designed to supersede the normal DVD format. It is designed mainly for storing High-definition video, video games, and other data. Blue-ray Disc is from blue-violet laser that is used to read the disc. Blue-ray Disc has huge storage capacity of 25 GB (single layer disc) and 50 GB (double layer disc).
Standard DVD uses 650 nanometer red laser, whereas Blue-ray uses 405 nanometer blue-violet laser providing a storage capacity of six times more than a standard DVD with the same size as that of standard DVD. Blue-ray Disc was developed by the Blue-ray Disc Association, makers of computer hardware, motion pictures and consumer electronics.
Mini Blue-ray Disc is a compact one and stores approximately 7.5 GB of data. This is specifically designed for camcorders (portable video camera) and compact recording devices. BD-R (recordable) and BD-RE (rewritable) versions of Blue-ray Disc are developed for recording and rewriting purposes. Definitely Blue-ray Disc will dominate the next generation.

Solar energy

Written in 28-11-2009 by | No Comments

Solar energy, a natural source of energy from Sun, has been harnessed by our ancestors since ancient times by means of various technologies. This is one of the most available renewable energy on Earth. But only a minor percentage of this energy is used.
Heat engines and photovoltaics help in the generation of electricity. The uses of solar energy are limited only by human initiative. Solar hot water, solar cooking, daylighting, etc. include in the partial list of solar applications. Generation of energy from Sun is either direct or indirect. There are many technologies involved in each.
The use of renewable resources on energy like Sun, wind will bring a great solution to the existing power crisis in many of the remote places in the country.

Deforestation

Written in 28-11-2009 by | No Comments

Deforestation, the main cause for the devastation of our biodiversity, has been practising for many years. But today’s worrying factor is the massive destruction of rainforests.
Trees play a vital part in environment, animals, and humans. They act as filters of carbon dioxide. Trees and vegetation are being destroyed to make room for housing and businesses. Statistics says that more than 50 percent of the tree population has disappeared due to human activity.
The adverse effects of deforestation are erosion of soil, disruption of the water cycle, loss of biodiversity, flooding and drought, and climate change.
We citizens can try to prevent deforestation by many small simple ways. We can plant some saplings in our own garden. These will give oxygen and protect against soil erosion. Recycling of books, papers, bottles, cans, shopping bags also helps. Crop rotation also helps.
Trees are valuable resources. They provide food, oxygen, shade, and beauty.
Let us all join together and make some efforts to prevent their destruction to save a healthy environment for next generation!

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