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Sunday, July 19, 2009

hair oil

In Kerala, people used to use plain coconut oil heated/treated with hibiscus or some other spices as hair oil.
Some of the women had very long hair. But then they started to cut down the length of their hair just like males.
So I think their concept of use of hair oil also has changed with time.
But now you can buy varieties of hair oil, perfumed etc in bottles, small pouches etc. with attributes like non greasy, non sticky, stops hair loss, adds vitality to your hair, gets rid of dandruff, herbal hair oil, almond drops hair oil, amla hair oil, leaves hair soft, silky and shiny etc.
But I do not know what is the difference between the old hair oil and the new fangled ones except the cost and ease of buying and using .


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Thursday, July 16, 2009

some silly things

Is it possible to lose a lot of weight in a single week through exercise ?
Does the cockroach have a bizarre odour
Why do some clothes smell mouldy even after they are washed ?
Is practicing hard for football worth it ?
How does a shy boy talk to a girl he has just met in class ?
Why do people try so hard to participate in the auction of bsnl vanity cellphone numbers ?
Is buying a used car better than buying a new car even if you have ready cash for the new car?


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Tuesday, July 14, 2009

mobile cell phones vs landline

In the old days, the only telecom company in India was BSNL, the government controlled entity.
There was no mobile network. Only landlines were present. Getting a telephone connection was a long process. You applied for a connection and waited for something like months before you got a telephone alloted to you.

But now with the arrival of cell phone companies , getting a phone connection is a lot easier. You just go to a phone shop (or even some other general stores) with a passport size photo and copies of identification documents like voter id etc, and you can buy a sim card which is usually activated then itself on receipt of the identification documents by the shop keeper.

some of the networks in kerala are idea ( earlier bpl mobile or escotel ? ) , bsnl cellone, airtel, tata indicom

ideacellular.com

bsnl.co.in

airtel.in

tataindicom.com

There have been problems with call congestion on certain networks during peak usage hours. There are also complaints about billing on post paid services of some service providers. There are also some problems with unwanted promotional messages, advertisement calls etc.

In kerala mobile phones have become very common place. Even people earning very little money like casual labourers , auto drivers etc use mobile phones (usually cheap mobile handsets with black and white display) to keep in touch with their clientele.
Some college students carry around two or three mobile phones. Students seem to be searching for the latest and hottest mobile phones. Sometimes this kind of mobile phone usage seems to develop into something like an addiction. There was even an incident when some student committed suicide apparently because his parents enforced some ban on his cell phone usage.

There also have been safety concerns on the use of mobile phones by very young children.
Some governments have banned the use of cell phones in schools and some universities like anna university in tamilnadu have banned the use of camera phones in engineering colleges during class hours.

Using a mobilephone while driving is very dangerous since the reaction time may be slower.

Some of the qualities to look for in a mobile phone seem to be ruggedness ,durability, memory, camera quality in case of a phone with camera, texting ease, should fit easily in ones pocket etc.


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Monday, July 13, 2009

digital cameras

In the old days you had cameras which used film, It was very costly to develop the film and print it out. The capacity was also small.
Nowadays there are digital cameras where the capacity can be expanded using memory cards. You can review the photos on the screen or on a computer, use software to make the photos prettier and print them out on special photo paper (slightly more expensive than ordinary paper)

some of the common brands are jvc , kodak, epson, canon , hitachi, nikon, panasonic, philips, sony, benq etc

jvc.com

digitalcameras.kodak.com

usa.canon.com

benq.com/products/digicam

I use a simple kodak camera, and sometimes wish that i had bought one which can be fitted with extra lens for taking photos of objects a little far away.





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conditional identities in trigonometry

conditional identities in trigonometry are usually based on A,B, C being angles of a triangle or A + B +C = π

examples

If A + B + C = π , show that cosA + cosB + cos C = 1 + 4 sin(A/2)sin(B/2)sin(C/2)

explanation of If A + B + C = π , show that cosA + cosB + cos C = 1 + 4 sin(A/2)sin(B/2)sin(C/2)

If A+B+C=π, prove that: sinA+sinB+sinC = cot(A/2).cot(B/2) [sinA+sinB-sinC]

explanation





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Sunday, July 12, 2009

radius of curvature

find the radius of curvature of y = exp(-x) at x =1

y' = -exp(-x)

y" = exp(-x)

at x = 1

y' = -exp(-1)= -1 /e

y" = exp(-1) = 1/e

radius of curvature = { [ 1 + (y')² ] ^(3/2) } / y"

radius of curvature = { [e² + 1] ^(3/2) } / e²

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Saturday, July 11, 2009

gensets

In the old days for marriages rececptions, they would keep petromax lamps on hand in case the current went out.
Later on they started renting out generators which usually ran on kerosene or petrol , usually starts up on petrol and runs on kerosene, and were very noisy. The starting up of the generator was also quite hard with having to pull a cord to turn the flywheel? .
But now a days you can see generators in most shops due to the worsening power situation with power cuts and so on. Most of them are self starting as in they will start when you turn the key
In some of the big offices / banks you can see big generators which are of the size of a small room with huge mufflers to cut down on the sound. Even the small generators now are relatively silent when compared to the old ones.


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Dot Plots, Histograms and Stem-and-Leaf Plots | AP Statistics

  DOT PLOTS, HISTOGRAMS AND STEM-AND-LEAF PLOTS IN AP STATISTICS How to Read, Interpret and Compare Distributions: The Pile–Slice–Say Method...