Sunday, July 11, 2010

Morning Ring Around the Sun





The unusual phenomenon of a ring around the Sun could be seen, which seems to have first been sighted and officially called in by a dawn-treading sailor.

Some people who have viewed the rings, mock suns, sun dogs, or other related atmospheric phenomena have wondered if there were "some strange rays" being given off by the Sun or the Moon.

NOAA tells us that the Sun-ring, typically a harbinger of forthcoming rains, is a ring of colored or white light seen to be encircling the Sun, or at other times colorful arcs or spots, when viewed through the lens of an ice crystal cloud formed of high-atmosphere cirrus occurring at least 25,000 feet above the surface of the Earth. The angle of observation needed is about 22°.

The Sun-rings can be formed of the refraction of either solar or lunar light and occur regularly on a global scale.

While a Sun-ring (or Moon-ring) does not have much to do with predicting snowfall in the Winter, in the Spring and Summer it is an accurate predictor of rains to arrive in approximately 12 to 18 hours. The cirrus clouds in question usually come before a warm front. The rain that is "predicted" to fall is usually going to be a long, slow rainfall.

There can occur, however, a different ring called a "great halo", and the great halo is much more rare, appearing at an angle of observation of 46° from the Sun or Moon. With the great halo, the refracted light enters the top of the ice crystals to emerge from one of the sides; it can also enter through the sides of the crystals and then emerge from their bottom sides.

The sun was surrounded by an extraordinarily bright, rainbow-colored halo. Flanking it both left and right were two brilliant, comet-shaped rainbow-colored sun dogs or mock suns (technically known as parhelia from Greek words meaning "beside the sun").

Tuesday, July 6, 2010

computer science Question papers

Anna University, Computer science
7th SEM Question Papers

Degree /Branch: B.E. Computer Science and Engineering

Internet Programming QUESTION PAPER
Download

Cryptography & Network Security QUESTION PAPER
Download

Object Oriented & Analysis Design QUESTION PAPER


Total Quality Management 
QUESTION PAPER





C# & .Net  QUESTION PAPER
Download

Digital Signal Processing 
QUESTION PAPER

Thursday, July 1, 2010

Antivirus List

The free antivirus are: AVG, Avira, Spyware Terminator, PC Tools AntiVirus, BitDefender 10, Rising, DriveSentry, avsat, Comodo, Moon Secure and Blink.

The commercial antivirus: KAV, Bitdefender, Norton, CA, NOD32, Panda, McAfee, F-Secure, Trend Secure, TrustPort, G Data, Smart Security, ZoneAlarm, One LiveCare, KIS, Norman and QuickHeal.

1. PC Tools AntiVirus Free Edition 4.0.0.26 (freeware
Total memory usage during idle: 5680K
Total memory usage during scanning: 23948K
Cannot detect private trojan
Link: http://www.pctools.com/free-antivirus/
2. Norton Antivirus 2009 (shareware
Total memory usage during idle: 6000K
Total memory usage during scanning: 51312K
Cannot detect private trojan
Link: http://www.symantec.com/norton/antivirus
3. Kaspersky Antivirus 2009 v8.0.0.357 (shareware) 
Total memory usage during idle: 6565K
Total memory usage during scanning: 50892K
Detects private trojan through heuristic method, not through virus definition
Link: http://www.kaspersky.com/kaspersky_anti-virus
4. Spyware Terminator v2.2.3.444 (freeware) 
Total memory usage during idle: 7624K
Total memory usage during scanning: 64292K
Unable to detect virus with the built-in antivirus. However when tried to run the trojan, HIPS picks it up as a threat
Uses ClamAV for antivirus protection
Link: http://www.spywareterminator.com/
5. Norton AntiVirus 2008 (shareware) 
Total memory usage during idle: 8424K
Total memory usage during scanning: 78008K
Cannot detect private trojan
Link: http://www.symantec.com/norton/antivirus
6. BitDefender 10 Free Edition (freeware) 
Total memory usage during idle: 9668K
Total memory usage during scanning: 42492K
Cannot detect private trojan
Link:http://download.bitdefender.com/windows/desktop/free/final/en/bitdefender_free_v10.exe
7. Avira AntiVir Personal 8 (freeware) 
Total memory usage during idle: 10072K
Total memory usage during scanning: 70072K
Detects private trojan through heuristic method, not through virus definition
Link: http://www.free-av.com/
8. Kaspersky Internet Security 2009 v8.0.0.3578 (shareware) 
Total memory usage during idle: 16180K
Total memory usage during scanning: 44216K
Detects private trojan through heuristic method, not through virus definition
Link: http://www.kaspersky.com/kaspersky_internet_security
9. Rising Antivirus 20.44 (freeware) 
Total memory usage during idle: 16252K
Total memory usage during scanning: 59704K
Cannot detect private trojan through virus definition but blocks it from executing
Link: http://www.freerav.com/
10. DriveSentry 3.1 (freeware) 
Total memory usage during idle: 16992K
Total memory usage during scanning: 18504K
Cannot detect private trojan
Link: http://www.drivesentry.com/
11. avast! 4 Home Edition (freeware) 
Total memory usage during idle: 23100K
Total memory usage during scanning: 63416K
Cannot detect private trojan
Link: http://www.avast.com/eng/avast_4_home.html
12. CA Anti-Virus 2008 (shareware) 
Total memory usage during idle: 37756K
Total memory usage during scanning: 47556K
Cannot detect private trojan
Link: http://shop.ca.com/virus/antivirus.aspx
13. AVG Anti-Virus Free Edition 8.0.138 (freeware) 
Total memory usage during idle: 38244K
Total memory usage during scanning: 88244K
Detects private trojan through virus definition. Maybe they got a sample of the private trojan and added the detection to its virus definition
Link: http://free.avg.com/
14. ESET NOD32 Antivirus 3.0.669 (shareware) 
Total memory usage during idle: 40364K
Total memory usage during scanning: 46012K
Cannot detect private trojan
Link: http://www.eset.com/products/nod32.php
15. ESET Smart Security 3.0.669 (shareware) 
Total memory usage during idle: 42640K
Total memory usage during scanning: 39284K
Cannot detect private trojan
Link: http://www.eset.com/smartsecurity/
16. Trend Micro AntiVirus plus AntiSpyware 2008 (shareware) 
Total memory usage during idle: 42608K
Total memory usage during scanning: 63704K
Able to detect private trojan as suspicious activity and blocked it from executing
Link: http://apac.trendmicro.com/apac/products/personal/antivirus-plus-anti-spyware/
17. ZoneAlarm Antivirus 7.0.483 (shareware) 
Total memory usage during idle: 52772K
Total memory usage during scanning: 97200K
Cannot detect private trojan
Link:http://www.zonealarm.com/store/content/catalog/products/zonealarm_antivirus.jsp
18. BitDefender Antivirus 2008 v11 (shareware) 
Total memory usage during idle: 56440K
Total memory usage during scanning: 73720K
Able to detect private trojan as threat
The free version uses BitDefender v10 and the shareware version uses the latest v11. So I had to make a comparison on both BitDefender products.
Link: http://www.bitdefender.com/PRODUCT-2194-en–BitDefender-Antivirus-2008.html
19. Comodo AntiVirus 2.0.17.58 (freeware) 
Total memory usage during idle: 56668K
Total memory usage during scanning: 76668K
Unable to detect virus through its virus definition. However when tried to run the trojan, HIPS picks it up as a threat.
Link: http://antivirus.comodo.com/
20. Trend Micro Internet Security 2008 (shareware) 
Total memory usage during idle: 59140k
Total memory usage during scanning: 79688K
Able to detect private trojan as suspicious activity and blocked it from executing
21. F-Secure Anti-Virus 2008 (shareware) 
Total memory usage during idle: 61972K
Total memory usage during scanning: 178824K
Cannot detect private trojan
Link: http://www.f-secure.com/home_user/products_a-z/fsav2008.html
22. Moon Secure Antivirus 2.2.2.163 (freeware) 
Total memory usage during idle: 71528K
Total memory usage during scanning: 71528K
Cannot detect private trojan
No changes in memory usage during idle and scanning
Uses Clam Antivirus engine and definition
Link: http://www.moonsecure.com/
23. Panda Antivirus 2008 (shareware) 
Total memory usage during idle: 76344K
Total memory usage during scanning: 101416K
Cannot detect private trojan
Link: http://www.pandasecurity.com/malaysia/homeusers/solutions/antivirus/
24. McAfee VirusScan Plus 2008 (shareware) 
Total memory usage during idle: 87632K
Total memory usage during scanning: 140484K
Detects private trojan as backdoor program
Link: http://us.mcafee.com/root/package.asp?pkgid=276
25. Norman Antivirus & Antispyware (shareware) 
Total memory usage during idle: 99856K
Total memory usage during scanning: 201660K
Cannot detect private trojan
Link: http://www.norman.com/Product/Home_Home_office/NVC/49922/
26. Windows One LiveCare 2.5 (shareware) 
Total memory usage during idle: 102868K
Total memory usage during scanning: 107868K
Cannot detect private trojan
Link: http://onecare.live.com/site/en-us/default.htm
27. eEye Blink 4.04 Personal Edition (shareware) 
Total memory usage during idle: 117972K
Total memory usage during scanning: 131412K
Cannot detect private trojan
Free 1 year license for US/Canada residents
Link: http://www.blinkfree.com/
28. G DATA AntiVirus 2008 (shareware) 
Total memory usage during idle: 130544K
Total memory usage during scanning: 175176K
Cannot detect private trojan
Link: http://www.gdata.de/trade/US/productview/819/16/
29. Quick Heal AntiVirus Plus 2008 v9.50 (shareware) 
Total memory usage during idle: 151660K
Total memory usage during scanning: 201660K
Cannot detect private trojan
Link: http://www.quickheal.co.in/small-desktop-edition-win.asp