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| From mylife |
Posts
5 years ago
Wednesday, July 1, 2009
(MY029) What Supersonic Looks Like
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| From mylife |
The breaking of the sound barrier is not just an audible phenomenon. As a new picture from the U.S. military shows, Mach 1 can be quite visual.
This widely circulated new photo shows a Air Force F-22 Raptor aircraft participating in an exercise in the Gulf of Alaska June 22, 2009 as it executes a supersonic flyby over the flight deck of the aircraft carrier USS John C. Stennis.
The visual phenomenon, which sometimes but not always accompanies the breaking of the sound barrier, has also been seen with nuclear blasts and just after space shuttles launches, too. A vapor cone was photographed as the Apollo 11 moon-landing mission rocketed skyward in 1969.
The phenomenon is not well studied. Scientists refer to it as a vapor cone, shock collar, or shock egg, and it's thought to be created by what's called a Prandtl-Glauert singularity.
Here's what scientists think happens:
A layer of water droplets gets trapped between two high-pressure surfaces of air. In humid conditions, condensation can gather in the trough between two crests of the sound waves produced by the jet. This effect does not necessarily coincide with the breaking of the sound barrier, although it can. To learn more, click here.
The aircraft carrier was participating in Northern Edge 2009, an exercise focused on detecting and tracking things at sea, in the air and on land.
(MY027) China backs down from requirement for Web filter
BEIJING -
In a rare reversal, China's government gave in to domestic and international pressure and backed down Tuesday from a rule that would have required personal computers sold in the country to have Internet-filtering software.
Just hours before the rule was to have taken effect, the government said it would postpone the requirement for the "Green Dam" software. The Ministry of Industry and Information Technology said it made the decision partly because some PC manufacturers were having difficulty meeting the deadline. It did not say whether the plan might be revived.
The change of course averted a possible scuffle with Washington. Top U.S. officials had protested the plan after it was imposed abruptly in May, calling it a barrier to trade. Angry Web users circulated online petitions protesting Green Dam, while industry groups warned the software might create computer security problems.
The controversy reflected the conflict between the communist government's desire to control information and China's high-tech ambitions. The country has an increasingly informed, vocal public and tighter links to companies that create urgently needed jobs and tax revenue.
http://tech.yahoo.com/news/ap/20090630/ap_on_hi_te/as_tec_china_internet
In a rare reversal, China's government gave in to domestic and international pressure and backed down Tuesday from a rule that would have required personal computers sold in the country to have Internet-filtering software.
Just hours before the rule was to have taken effect, the government said it would postpone the requirement for the "Green Dam" software. The Ministry of Industry and Information Technology said it made the decision partly because some PC manufacturers were having difficulty meeting the deadline. It did not say whether the plan might be revived.
The change of course averted a possible scuffle with Washington. Top U.S. officials had protested the plan after it was imposed abruptly in May, calling it a barrier to trade. Angry Web users circulated online petitions protesting Green Dam, while industry groups warned the software might create computer security problems.
The controversy reflected the conflict between the communist government's desire to control information and China's high-tech ambitions. The country has an increasingly informed, vocal public and tighter links to companies that create urgently needed jobs and tax revenue.
http://tech.yahoo.com/news/ap/20090630/ap_on_hi_te/as_tec_china_internet
(MY026) More sex may help damaged sperm
LONDON – For men with fertility problems, some doctors are prescribing a very conventional way to have a baby: more sex.
In a study of 118 Australian men with damaged sperm, doctors found that having sex every day for a week significantly reduced the amount of DNA damage in their patients' sperm. Previous studies have linked better sperm quality to higher pregnancy rates.
The research was announced Tuesday at a meeting of the European Society of Human Reproduction and Embryology in Amsterdam.
Dr. David Greening of Sydney IVF, a private fertility clinic in Australia, and colleagues looked at 118 men who had damaged sperm. Greening and colleagues told the men to have sex every day for a week. After seven days, the doctors found that in 81 percent of the men, there was a 12 percent decrease in the amount of damaged sperm.
Many fertility experts suggest men abstain from sex before their partners have in-vitro fertilization, to try to elevate their sperm counts.
Sperm quality can also be improved if men don't smoke, drink moderately, exercise, or get more antioxidants.
http://news.yahoo.com/s/ap/20090630/ap_on_re_eu/eu_med_sperm_damage
In a study of 118 Australian men with damaged sperm, doctors found that having sex every day for a week significantly reduced the amount of DNA damage in their patients' sperm. Previous studies have linked better sperm quality to higher pregnancy rates.
The research was announced Tuesday at a meeting of the European Society of Human Reproduction and Embryology in Amsterdam.
Dr. David Greening of Sydney IVF, a private fertility clinic in Australia, and colleagues looked at 118 men who had damaged sperm. Greening and colleagues told the men to have sex every day for a week. After seven days, the doctors found that in 81 percent of the men, there was a 12 percent decrease in the amount of damaged sperm.
Many fertility experts suggest men abstain from sex before their partners have in-vitro fertilization, to try to elevate their sperm counts.
Sperm quality can also be improved if men don't smoke, drink moderately, exercise, or get more antioxidants.
http://news.yahoo.com/s/ap/20090630/ap_on_re_eu/eu_med_sperm_damage
(MY025) HOW SMART IS YOUR RIGHT FOOT?
This is hysterical. You have to try this. It is absolutely true. I guess there are some things that the brain cannot handle. HOW SMART IS YOUR RIGHT FOOT? You have to try this please, it takes 2 seconds. I could not believe this!!! It is from an orthopedic surgeon............ This will boggle your mind and you will keep you trying over and over again to see if you can outsmart your foot, but, you can't. It's pre-programmed in your brain!
1. Without anyone watching you (they will think you are GOOFY.......) and while sitting at your desk in front of your computer, lift your right foot off the floor and make clockwise circles.
2. Now, while doing this, draw the number '6' in the air with your right hand. Your foot will change direction. I told you so!!! And there's nothing you can do about it! You and I both know how stupid it is, but before the day is done you are going to try it again, if you've not already done so.
1. Without anyone watching you (they will think you are GOOFY.......) and while sitting at your desk in front of your computer, lift your right foot off the floor and make clockwise circles.
2. Now, while doing this, draw the number '6' in the air with your right hand. Your foot will change direction. I told you so!!! And there's nothing you can do about it! You and I both know how stupid it is, but before the day is done you are going to try it again, if you've not already done so.
(MY024) 14-year old girl rescued from Yemenia crash
A relative of passengers aboard the flight from Yemen speaks with the media as he arrives at a crisis centre at Charles de Gaulle airport near Paris, yesterday. — Reuters picMORONI, July 1 — An Airbus A310-300 from Yemen with 153 people on board, including 66 French nationals, crashed into the sea off the Indian Ocean archipelago of Comoros as it approached in bad weather early yesteryday, officials said.
A 14-year-old girl was found alive in the sea, Comoros Communications Minister Abdourahim Said Bakar said. Earlier reports had said the rescued child was five.
The Paris airports authority said 66 French nationals were aboard the plane, which was flying the final leg of a trip from Paris and Marseille to Comoros via Yemen.
A Yemeni aviation official said there were also nationals from Canada, Comoros, Ethiopia, Indonesia, Morocco, the Palestinian territories, the Philippines and Yemen on the plane.
It is the second Airbus to plunge into the sea this month. An Air France Airbus A330-200 crashed into the Atlantic Ocean killing 228 people on board on June 1. A preliminary report on that crash is due on Thursday.
The Paris-Marseille-Yemen leg of the Yemenia flight was flown by an Airbus A330. In Sanaa, those passengers who were flying on to the Comoros changed onto a second Yemenia plane, the A310 that crashed.
A 14-year-old girl was found alive in the sea, Comoros Communications Minister Abdourahim Said Bakar said. Earlier reports had said the rescued child was five.
The Paris airports authority said 66 French nationals were aboard the plane, which was flying the final leg of a trip from Paris and Marseille to Comoros via Yemen.
A Yemeni aviation official said there were also nationals from Canada, Comoros, Ethiopia, Indonesia, Morocco, the Palestinian territories, the Philippines and Yemen on the plane.
It is the second Airbus to plunge into the sea this month. An Air France Airbus A330-200 crashed into the Atlantic Ocean killing 228 people on board on June 1. A preliminary report on that crash is due on Thursday.
The Paris-Marseille-Yemen leg of the Yemenia flight was flown by an Airbus A330. In Sanaa, those passengers who were flying on to the Comoros changed onto a second Yemenia plane, the A310 that crashed.
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