free samples

india is probably going international.
p&g offers free samples in india.
use and recommend.
register here.

http://www.rewardme.in/

solar water purifier

the website below says this solar water disinfection device
which can be attached to a pet bottle will make the water
in the bottle  potable with a few hours of exposure
using just the uv rays of the sunshine; no chemicals or electricity.
the site says it is going to test the device in odisha in a big way.
u can get the device called WADI for about 50 pounds now.
the ultimate price when distributed on a large scale will be
much less.

http://www.indiegogo.com/projects/helioz-wadi-a-new-inexpensive-and-sustainable-solar-water-disinfection-tool

3D printers

3D printing is not printing but manufacturing things
using a computer design automatically. well almost.
the site below gives details of a 3D printer which
can make things almost 6 inch in dimension.
the printer costs  about 1000 usd . if any one has
first hand experience of using 3D printer please post
 it here as guidance for intending users. i have no
personal experience.

http://www.indiegogo.com/projects/fabtotum-personal-fabricator

track your train

want to know where your train is right now ?
click trainradar.com . a fantastic application
which maps all the trains running in india inr
real time. and mucm more. where it stops next,
whether it is running late etc.
a fantastic program which maps about 2000 trains
on google map and provides massive information
on each train and connected stations.

digital  inverter compressors 

i bought a  samsung fridge with the 

digital inverter compressor.  the 10 yr

warranty is a  big relief. the fridge  works 

silently. saving in electric power is yet 

 to be established. i will get back with 

the details later.

not much is known about the theory.

unlike  normal compressors which

are switched on and off, this one is

always on.  rpm is varied to suit the load 

conditions. but what algorithm is used or 

how it saves power is not clear yet.