JB Grounding

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If my JB is already connected with the steel structure of the plant which is grounded to P.E. whether we require to again ground the JB with grounding wire or steel structure will serve the purpose.

Transmission Delay in TV Signal – Why?

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I have a satellite dish TV connection at my home. My neighbour has a conventional cable television (we in India call it cable TV). When viewing the same TV programme, i find that he gets the picture first and the same picture is seen in my TV after a delay of about 30 to 45 minutes and some occassio

Google Buzz Not a Threat To Twitter and Facebook, Instead It’s "Filling a Niche" [Google]

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Google may be aware they should've spent longer testing Buzz, but according to their VP of product management, it doesn't pose a threat to Twitter and Facebook. Instead, "it's filling a niche, which is not currently met in the market."

Bradley Horowitz from Google told eWeek that in addition to not wanting to replace Twitter or Facebook, they're also pretty chuffed with how many people have been using Buzz since the launch in early February. Apparently "tens of millions" people made over 9 million posts and comments on Buzz, with 200 posts a minute being made on their phones.

How many of those are from Google employees trying to keep the momentum going, though? [eWeek via TechRadar]


Broken Step From Apple’s New York Store On Sale at eBay For $2,500 [Apple]

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Answering the age-old question of what to buy a Mac fanboy who has everything, eBay user heylookitskibbe has put a stolen, broken step from the 5th Avenue Apple store up for sale with a buy-it-now price of $2,500.

The eBay seller says:

"They replaced it with a new one after a customer dropped a snapple bottle on it and cracked it. I picked it up before it could be thrown out over a year ago, figuring it's a collectible.

When these are new, they cost 10K to buy from the German glass-makers. So, since it's cracked I figure it's worth at least $2500, considering the steps are all custom ordered.

You could use it as a coffee table on top of some cinder blocks, or just keep it for the sake of keeping it.

Unfortunately, I can't deliver it. You'll need to come pick it up in Brooklyn, NY, and I recommend you bring a car and a friend or two. It weighs about 250 lbs. It's about 10 layers of very thick glass.

If you're a collector of Apple memorabilia, you've got to have this. I know for a fact that only three of them exist outside of the retail stores' circulation, and this is one of them. So, needless to say, it's rare. I doubt it if you'll ever see something like this again."

Two thousand and five hundred dollars. Needless to say, the opening bid stands at $700 with no takers yet. Or, now you know it takes a fallen Snapple bottle to bring down the mighty stairs of Apple. [eBay via 9 to 5 Mac]


Endeavour Comes Home

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Endeavour Comes Home
With landing gear down, space shuttle Endeavour approaches the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida after 14 days in space, completing the 5.7-million-mile STS-130 mission. Endeavour landed at 10:20 p.m. EST on Sunday, Feb. 21, after delivering the new Tranquility node and its seven-window cupola to the International Space Station. Returning to Earth aboard Endeavour are Commander George Zamka; Pilot Terry Virts; and Mission Specialists Robert Behnken, Nicholas Patrick, Kathryn Hire and Stephen Robinson.

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Mains Load Current and Voltage Measurement

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plz any one can help me to design a circuit using pic microcntroller to measure mains voltage and load current without using current transformer or volage transformer. actually i wish to measure with pic microcontroller's internal ADC ,so how can i convert this mains voltage and load current to DC p

Rain, Rain, Go Online

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This image shows the Brown Mountain area in the Angeles National Forest on Sept. 28, 2009, shortly after the most intense part of the Station fire had died down.
This image shows the Brown Mountain area in the Angeles National Forest on Sept. 28, 2009, shortly after the most intense part of the Station fire had died down. Tom Farr, a geologist at NASA's Jet Propulsion Laboratory, has been jogging and taking notes in areas around the forest to study how sediment is moving on scorched hillsides.

› Larger image

A new webcam at NASA's Jet Propulsion Laboratory is keeping an eye on debris and water flows that could course down nearby wildfire-stripped hillsides during a rainstorm.

The camera, installed by the U.S. Geological Survey, looks over the Arroyo Seco, a usually dry riverbed on the east side of JPL property. The Lab, in addition to the National Weather Service, the U.S. Geological Survey and first responders will be monitoring the images for large pulses of water and debris, which could damage surrounding areas.

The public can also watch the current state of the stream in real-time at http://ca.water.usgs.gov/webcams/jpl/ . New images appear every five minutes, and users can control the camera for up to three minutes at a time.

The Station fire, as it's known, charred more than 160,000 acres in and around the San Gabriel Mountains and crept to within an eighth of a mile of JPL in late August 2009. Rains this month caused mudslides on slopes burned bare by the fire and damaged homes in areas not far from JPL. Mudslides and debris flows could potentially threaten foothill communities for years to come.

The U.S. Geological Survey approached Eric Fuller, JPL's emergency preparedness administrator, after he attended a meeting with geologists, fire officials, land managers and other stakeholders. The Survey installed the camera in early February, and JPL has provided electrical power and a network line.

"Though we haven't had any damage at JPL, we want to be prepared and we want everyone else to be, as well," Fuller said.

The webcam is part of JPL's ongoing interest in studying the effects of the Station fire. Shortly after the most intense part of the wildfire, Tom Farr, a geologist at JPL, began working with researchers from the California Institute of Technology, the Survey and Arizona State University, Tempe, to study how sediment is moving on scorched hillsides around the Arroyo.

Farr, who has jogged regularly through the area for more than 20 years, now uses the daily runs for field work. His photos show log jams, erosion around guard rails and displaced boulders. He has also noted that in some places streams have flowed into old channels and others have broken off pavement from the roads. He also checks rain rates recorded by the JPL weather station, available at http://weatherstation.jpl.nasa.gov/ .

"The Arroyo Seco is almost unrecognizable from before the fires," Farr said. "A huge amount of sediment has been deposited and in some places eroded during the last few storms. We'll want to keep watching."

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Behold the Violent History of Saturn’s White Whale Moon

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Saturn's moon Prometheus
Saturn's potato-shaped moon Prometheus is rendered in three dimensions in this close-up from Cassini. › Full image and caption
Like the battered white whale Moby Dick taunting Captain Ahab, Saturn's moon Prometheus surges toward the viewer in a 3-D image from NASA's Cassini spacecraft.

The image exposes the irregular shape and circular surface scars on Prometheus, pointing to a violent history. These craters are probably the remnants from impacts long ago.

Prometheus is one of Saturn's innermost moons. It orbits the gas-giant at a distance of about 140,000 kilometers (86,000 miles) and is 86 kilometers (53 miles) across at its widest point. The porous, icy world was originally discovered in images taken by NASA's Voyager 1 spacecraft back in 1980.

Cassini's narrow-angle camera captured two black-and-white images of the moon on Dec. 26, 2009, and the imaging team combined the images to make this new stereo view. It looks different from the "egg-cellent" raw image of Prometheus obtained on Jan. 27 because that view shows one of the short ends of the oddly shaped moon. In this 3-D image, the sun illuminates Prometheus at a different angle, making the moon's elongated body visible.

The Cassini Equinox Mission is a joint United States and European endeavor. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter was designed, developed and assembled at JPL. For more information about the Cassini Equinox Mission visit: http://www.nasa.gov/cassini and http://saturn.jpl.nasa.gov.

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Beginning the Journey Home

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This view of the port side of space shuttle Endeavour's cargo bay was recorded after separation from the International Space Station on Feb. 19, 2010, as the STS-130 astronauts prepared for a Feb. 21 landing, after spending over a week working in tandem with the Expedition 22 crew members aboard the station. Other than the docking system hardware, the cargo bay is empty after delivering the Tranquility node and the new cupola to the orbital outpost.

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Inspecting Friendship 7

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Astronaut John Glenn inspects artwork that will be painted on the outside of his Mercury spacecraft, which he nicknamed Friendship 7. On Feb. 20, 1962, Glenn lifted off into space aboard his Mercury Atlas (MA-6) rocket to become the first American to orbit the Earth. After orbiting the Earth 3 times, Friendship 7 landed in the Atlantic Ocean, just East of Grand Turk Island in the Bahamas. Glenn and his capsule were recovered by the Navy Destroyer Noa, 21 minutes after splashdown.

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NASA To Preview April Flight Of Space Shuttle Discovery

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NASA will preview the next space shuttle mission during a series of news briefings on Tuesday, March 9, at NASA's Johnson Space Center in Houston. NASA Television and the agency's Web site will broadcast the briefings live. Reporters will be able to ask questions from participating NASA locations.

The STS-131 mission, targeted for launch April 5, will be shuttle Discovery's next-to-last flight and deliver critical spare parts and cargo to the International Space Station. A multipurpose logistics module will be carried inside the shuttle's payload bay and temporarily attached to the station during the mission. The cargo carrier will be brought back with the shuttle. Following STS-131, only three more shuttle flights are scheduled.

Alan Poindexter will serve as the mission commander and James Dutton as the pilot. They will be joined by Mission Specialists Rick Mastracchio, Dorothy Metcalf-Lindenburger, Clayton Anderson, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. Dutton, Metcalf-Lindenburger and Yamazaki will be making their first trips into space. Metcalf-Lindenburger is a member of the cadre of former educators trained as mission specialists and the last of that group scheduled to fly on the shuttle.

The schedule of briefings includes (all times CST):
8:00 a.m. -- Program Overview
9:30 a.m. -- STS-131 Mission Overview
11:30 a.m. -- STS-131 Spacewalk Overview
1:00 p.m. -- STS-131 Crew News Conference

The crew will be available for interviews at Johnson after the briefings. Reporters must contact Gayle Frere at 281-483-8645 by March 5 to reserve an interview opportunity. Reporters planning to attend the briefings in Houston must contact the Johnson newsroom at 281-483-5111 by 5 p.m. CST on March 3 for credentials.

For NASA TV downlink information, schedules and links to streaming video, visit:

http://www.nasa.gov/ntv

For the latest information about the STS-131 mission and its crew, visit:

http://www.nasa.gov/shuttle

For more information about the space station and its crew, visit:

http://www.nasa.gov/station

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Space Shuttle Crew "Endeavours" A Return To Earth Sunday

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Space shuttle Endeavour and its six-member crew are expected to return to Earth on Sunday, Feb. 21 after a 14-day mission. NASA managers will evaluate weather conditions at NASA's Kennedy Space Center in Florida before permitting Endeavour to land.

Sunday landing opportunities at Kennedy are at 10:16 p.m. and 11:51 p.m. EST. There are additional opportunities at 1:20 a.m. and 2:55 a.m. EST Monday at Edwards Air Force Base, Calif., a backup landing site. For recorded updates about landing, call 321-867-2525.

If Endeavour lands Sunday in Florida as scheduled, NASA officials will hold a briefing to discuss the mission no earlier than midnight. The participants will be:
- Mike Moses, space shuttle launch integration manager
- Mike Leinbach, shuttle launch director

After touchdown, the astronauts will undergo routine physical examinations and meet with their families. Because of the late hour, the crew will not participate in a post-landing news conference, but a crew statement from the runway is expected. The news events will be broadcast live on NASA Television and the agency's Web site.

The Kennedy news center will open for landing activities at 6 p.m. Sunday and remain open through Monday. The STS-130 media badges are in effect through landing. The media accreditation building on State Road 3 will be open Sunday from 5:30 p.m. to 8 p.m. The last bus will depart from the news center for the Shuttle Landing Facility one hour before landing.

If the landing is diverted to Edwards, news media should call the NASA Dryden Flight Research Center public affairs office at 661-276-3449. Dryden has limited facilities available for previously accredited journalists.

The NASA News Twitter feed is updated throughout the shuttle mission and landing. To follow, visit:

http://www.twitter.com/nasa

For NASA TV downlink information, schedules and links to streaming video, visit:

http://www.nasa.gov/ntv

For the latest information about the STS-130 mission and accomplishments, visit:

http://www.nasa.gov/shuttle


For more information about the space station and its crew, visit:

http://www.nasa.gov/station

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Space Shuttle Endeavour Crew Returns to Earth after Delivering the Last Major U.S. Portion of the International Space Station

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Space shuttle Endeavour and six astronauts ended a 14-day journey of more than 5.7 million miles with a 10:20 p.m. EST landing Sunday at NASA's Kennedy Space Center in Florida.

The STS-130 mission to the International Space Station included three spacewalks and the installation of the Tranquility node, a module that provides additional room for crew members and many of the space station's life support and environmental control systems. Attached to Tranquility is a cupola with seven windows that offers a panoramic view of Earth, celestial objects and visiting spacecraft. Tranquility and its cupola are the final major U.S. portions of the station. The orbiting laboratory now is approximately 90 percent complete in terms of mass.

George Zamka commanded the flight and was joined on the mission by Pilot Terry Virts and Mission Specialists Kathryn Hire, Stephen Robinson, Nicholas Patrick and Robert Behnken. A welcome ceremony for the astronauts will be held Monday, Feb. 22, in Houston. The public is invited to attend the 4 p.m. CST event at Ellington Field's NASA Hangar 990.

Highlights from the ceremony will be broadcast on NASA Television's Video File. For NASA TV downlink information, schedules and links to streaming video, visit:

http://www.nasa.gov/ntv

With Endeavour and its crew safely home, the stage is set for launch of shuttle Discovery on its STS-131 mission, targeted to lift off April 5. Discovery's 13-day flight will deliver supplies, a new crew sleeping quarters and science racks that will be transferred to the station's laboratories.

For more about the STS-130 mission and the upcoming STS-131 flight, visit:

http://www.nasa.gov/shuttle

Two STS-131 crew members, NASA astronaut Clay Anderson and Naoko Yamazaki of the Japan Aerospace Exploration Agency, are tweeting about preparing for their mission. For their Twitter feeds and other NASA social media Web sites, visit:

http://www.nasa.gov/connect

For information about the International Space Station, visit:

http://www.nasa.gov/station

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Piston Striking Head-Reciprocating Compressor

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hi to all,

we have a double acting reciprocating compressor. we have checked the clearance between piston top and outer head. but while running the piston top collides with the head. may be because of thermal expansion. but after calculation it was found out that the expansion of rod is mor

Allen Barry

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I have got to hear that some company named ALLEN BARRY, which is a oil and drilling company, is going to conduct Campus Interview at my College.

I have searched the internet (Google) for the company Website. But I couldnot find a website matching information I have got. I was told that it i

Depressurization of Vessel

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Hi, Friends

We are planning to carry out the pressure test of our vessel for 66 ksc.

Volume of vessel is 36.5m3.

We want depressurization of vessel from 66 ksc to less than 40 ksc within 5 seconds.

I want your opinions for depressurization regarding plumbing sizes