Fuel cell for laptop
Fuel cell converts chemical energy of a fuel directly into electricity. Fuel cells are intrinsically more efficient than most other energy-conversion devices. Electrolytic chemical reactions cause electrons to be released on one electrode and flow through an external circuit to a second electrode. Whereas in batteries the electrodes are the source of the active ingredients, which are altered and depleted during the reaction, in fuel cells the gas or liquid fuel (often hydrogen, methyl alcohol, hydrazine, or a simple hydrocarbon) is supplied continuously to one electrode and oxygen or air to the other from an external source. So, as long as fuel and oxidant are supplied, the fuel cell will not run down or require recharging. Fuel cells can be used in place of virtually any other source of electricity. They are especially being developed for use in electric automobiles, in the hope to reduce pollution.
Change DVD Region Settings
DVD's have different region codes. Region 0 play on all DVD players, Region 1 in USA and Canada, Region 2 is Japan & Europe, Region 4 covers South America. A region 2 DVD will only play on a region 2 DVD player while a region 1 will not.
To change the settings you must be logged in as the administrator, or be part of the administrative group to make this change. You also need to have a DVD for that region in your drive when you make the change.
Right-click "My Computer" and select "Properties". On the "Hardware" tab, click "Device Manager".
You'll see a list of devicesdouble-click DVD/CD-ROM drives the right-click the DVD drive that you want to
change region settings for then choose Properties.
On the "DVD Region" tab change it to the region you need.
CTRL+TAB (Move forward through the tabs)
CTRL+SHIFT+TAB (Move backward through the tabs)
TAB (Move forward through the options)
SHIFT+TAB (Move backward through the options)
Compiled By Edward Apurba Singha, Computer Engineer.
(R) thedailystar.net 2007