Friday, August 15, 2008
My friend Prabu told me that http://www.co.cc/?id=145451 is a site where one could register free domains! So I made a try, and registered http://www.sdeepak.co.cc/ for free. This domain is used to redirect the website to this blog! For those people who find it difficult to remember my blog URL can easily remember this new web address also you can register the domains you want for free!
Thursday, August 14, 2008
Have a read....
In some computers, when we double click a drive we get the "open with" dialog box. This is because of an unwanted file residing in the computer. Its name is "autorun.inf". To delete the file and restore the old operation of a drive opeing in the same window do the following steps.
1. Select START --> RUN.
2. enter "cmd" and press enter.
3. Type the drive name in which you ve the problem and click enter.(say if the problem is in C drive enter "C:\")
4. Enter "attrib -s -h - r *.inf".
5. Enter "del *.inf".
Now try opening the drives.I had the problem in my computer. Now i deleted the autorun.inf file and now the problem is solved. Try it!!!
Article link: http://arun-kumaar.blogspot.com/2008/08/open-with-virus.html
Wednesday, August 13, 2008
Then, what is a happy number?
A happy number is defined by the following process. Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers, while those that do not end in 1 are unhappy numbers.
More formally, given a number n = n0, define a sequence n1, n2, ... where ni + 1 is the sum of the squares of the digits of ni. Then n is happy if and only if there exists i such that ni = 1.
If a number is happy, then all members of its sequence are happy; if a number is unhappy, all members of its sequence are unhappy.
For example, 7 is happy, as the associated sequence is:
7^2 = 49
4^2 + 9^2 = 97
9^2 + 7^2 = 130
1^2 + 3^2 + 0^2 = 10
1^2 + 0^2 = 1.
The happy numbers below 500 are
1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, 103, 109, 129, 130, 133, 139, 167, 176, 188, 190, 192, 193, 203, 208, 219, 226, 230, 236, 239, 262, 263, 280, 291, 293, 301, 302, 310, 313, 319, 320, 326, 329, 331, 338, 356, 362, 365, 367, 368, 376, 379, 383, 386, 391, 392, 397, 404, 409, 440, 446, 464, 469, 478, 487, 490, 496.
If n is not happy, then its sequence does not go to 1. What happens instead is that it ends up in the cycle.
4, 16, 37, 58, 89, 145, 42, 20, 4, ...
To see this fact, first note that if n has m digits, then the sum of the squares of its digits is at most 81m. For m = 4 and above,so any number over 1000 gets smaller under this process. Once we are under 1000, the number for which the sum of squares of digits is largest is 999, and the result is 3 times 81, that is, 243.
In the range 100 to 243, the number 199 produces the largest next value, of 163.
In the range 100 to 163, the number 159 produces the largest next value, of 107.
In the range 100 to 107, the number 107 produces the largest next value, of 50.
Happy Primes
A happy prime is a happy number that is prime. The happy primes below 500 are
7, 13, 19, 23, 31, 79, 97, 103, 109, 139, 167, 193, 239, 263, 293, 313, 331, 367, 379, 383, 397, 409, 487.
All numbers, and therefore all primes, of the form 10n + 3 and 10n + 9 are happy. To see this, note that these numbers yield values of either 12 + 02 + 02 + ... + 02 + 02 + 32 = 10 → 12 + 02 = 1 or 12 + 02 + 02 + ... + 02 + 02 + 92 = 82 → 82 + 22 = 68 → 62 + 82 = 100 → 12 + 02 + 02 = 1.
Tuesday, August 12, 2008
Whenever I switch on the tv, in majority of the channels the debate on INDO_US nuclear deal is going on!
What does Indo-US nuclear deal mean?
On July 26 2007- The US House of Representatives voted to approve a landmark deal that will allow the United States to sell civilian nuclear technology to India.
Here is an overview of the deal and its implications:
WHAT IS THE PACT?
* The legislation amends Section 123 of the Atomic Energy Act of 1954. It lets the US make a one-time exception for India to keep its nuclear weapons without signing the Nuclear Non-Proliferation Treaty (NPT).
* The amendment overturns a 30-year-old US ban on supplying India with nuclear fuel and technology, implemented after India's first nuclear test in 1974.
* Under the amendment, India must separate its civilian and military nuclear facilities, and submit civilian facilities to inspections by the International Atomic Energy Agency (IAEA).
WHY IS IT CONTROVERSIAL?
* Critics say it undermines the NPT, which holds that only countries which renounce nuclear weapons qualify for civilian nuclear assistance.
* The accord sends the wrong message: it could undercut a US-led campaign to curtail Iran's nuclear program, and open the way for a potential arms race in South Asia.
* India says 14 of its 22 nuclear facilities are civilian. Critics say the pact could make bomb making at the other eight easier, as civilian nuclear fuel needs will be met by the US
WHAT DO THE DEAL'S SUPPORTERS SAY?
* US President George Bush calls the deal necessary to reflect the countries' improved relations. It strengthens international security by tightening US ties to ally India, the world's biggest democracy. It also ensures some of its nuclear industry will undergo international inspection.
* New Delhi, which relies on imported oil for some 70 per cent of its energy needs, says nuclear power will help feed its rapidly expanding economy.
* France, which signed a similar deal with India in February 2006, says the move will help fight climate change and aid non-proliferation efforts.
HOW IS PAKISTAN INVOLVED?
* Pakistan sought a similar civilian technology deal with the US but was refused last in March. It is the only other confirmed nuclear power not to have signed the NPT - saying it will join after India does.
* Pakistan's own expanding nuclear program could fan the rivalry between India and Pakistan.
INTERNATIONAL RIVALRIES?
* China is said to have supported Pakistan's nuclear weapons program since the 1980s. Some analysts see the Indo-US deal as part of attempts by larger powers, the US and China, to shore up influence in South Asia by building up rival arsenals.
* The IAEA said in 2004 that Libya and Iran's nuclear programs were based on Chinese technology provided by Pakistan.
Article idea: http://www.expressindia.com/news/fullstory.php?newsid=71625
