dear friends
I have a project to connect a fiber optics cable between two links with a distance of 50 km, but i have a problem that the cable have to cross a river, so if any one have an idea, let him answer. thanks
Best Regards
Stress Concentration Factor
I'm analysing a component which has a U shaped notch cut in it. Using Petersons stress concentration factor book I can determine a k value but my question is this.
Peterson states this value is for a thin element and in my situation it is actually quite thick. Basically instead of it being
Problem With an Obstacle Avoider Robot
I am doing an obstacle avoider robot as my academic project.It uses 2 ir sensors to detect obstacle.And my platform is pic16f877a microcontroller.the individual working of ir sensors is ok.when working both at the same time..it doesnt work properly ..please help me with a working source code...
Lightening(thunder) arrest
Currently overseeing a building housing electric generation plants...Constantly been periodically distrupted by lightening strikes...can any guide speak by the mercy of ''the Almighty'' on reliability of lightening arrest on prone locations
Which Microcontroller for Analog Joystick
i want to control stepper motor using an analog joystick, can u please suggest me which microcontroller will be suitable for this applicaion
semiconductor carrier transport
in intrinsic GaAs, electron and hole mobilities are 0.85 and 0.04 m^2/v-s respectively.
corresponding effective mass ---0.068 and 0.5 m0.where m0 is 9.11*10^-31 kg.
if energy band gap at 300k is 1.43eV,
calculate intrinsic carrier concentration and conductivity.
Jumbo Jellyfish or Massive Star?
A cloud of material shed by a massive star can be seen in red in this new image from WISE.
› Larger image
Some might see a blood-red jellyfish in a forest of seaweed, while others might see a big, red eye or a pair of lips. In fact, the red-colored object in this new infrared image from NASA's Wide-field Infrared Survey Explorer (WISE) is a sphere of stellar innards, blown out from a humongous star.
The star (white dot in center of red ring) is one of the most massive stellar residents of our Milky Way galaxy. Objects like this are called Wolf-Rayet stars, after the astronomers who found the first few, and they make our sun look puny by comparison. Called V385 Carinae, this star is 35 times as massive as our sun, with a diameter nearly 18 times as large. It's hotter, too, and shines with more than one million times the amount of light.
Fiery candles like this burn out quickly, leading short lives of only a few million years. As they age, they blow out more and more of the heavier atoms cooking inside them -- atoms such as oxygen that are needed for life as we know it.
The material is puffed out into clouds like the one that glows brightly in this WISE image. In this case, the hollow sphere showed up prominently only at the longest of four infrared wavelengths detected by WISE. Astronomers speculate this infrared light comes from oxygen atoms, which have been stripped of some of their electrons by ultraviolet radiation from the star. When the electrons join up again with the oxygen atoms, light is produced that WISE can detect with its 22-micron infrared light detector. The process is similar to what happens in fluorescent light bulbs.
Infrared light detected by WISE at 12 microns is colored green, while 3.4- and 4.6-micron light is blue. The green, kelp-looking material is warm dust, and the blue dots are stars in our Milky Way galaxy.
This image mosaic is made up of about 300 overlapping frames, taken as WISE continues its survey of the entire sky -- an expansive search, sure to turn up more fascinating creatures swimming in our cosmic ocean.
V385 Carinae is located in the Carina constellation, about 16,000 light-years from Earth.
JPL manages the Wide-field Infrared Survey Explorer for NASA's Science Mission Directorate, Washington. The principal investigator, Edward Wright, is at UCLA. The mission was competitively selected under NASA's Explorers Program managed by the Goddard Space Flight Center, Greenbelt, Md. The science instrument was built by the Space Dynamics Laboratory, Logan, Utah, and the spacecraft was built by Ball Aerospace & Technologies Corp., Boulder, Colo. Science operations and data processing take place at the Infrared Processing and Analysis Center at the California Institute of Technology in Pasadena. Caltech manages JPL for NASA.
More information is online at http://www.nasa.gov/wise and http://wise.astro.ucla.edu.
View my blog's last three great articles...
- Astronomers Discover Star-Studded Galaxy Tail
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Astronomers Discover Star-Studded Galaxy Tail
NASA's Galaxy Evolution Explorer found a tail behind a galaxy called IC 3418. The star-studded tail can be seen in the image on the left, as detected by the space telescope in ultraviolet light. The tail has escaped detection in visible light, as shown by the image on the right.
› Full image and caption
NASA's Galaxy Evolution Explorer has discovered a galaxy tail studded with bright knots of new stars. The tail, which was created as the galaxy IC 3418 plunged into the neighboring Virgo cluster of galaxies, offers new insight into how stars form.
"The gas in this galaxy is being blown back into a turbulent wake," said Janice Hester of the California Institute of Technology in Pasadena, lead author of a recent study published in the Astrophysical Journal Letters. "The gas is like sand caught up by a stiff wind. However, the particular type of gas that is needed to make stars is heavier, like pebbles, and can't be blown out of the galaxy. The new Galaxy Evolution Explorer observations are teaching us that this heavier, star-forming gas can form in the wake, possibly in swirling eddies of gas."
Collisions between galaxies are a fairly common occurrence in the universe. Our Milky Way galaxy will crash into the Andromeda galaxy in a few billion years. Galaxies tangle together, kicking gas and dust all around. Often the battered galaxies are left with tails of material stripped off during the violence.
Hester and her team studied the tail of IC 3418, which formed in a very different way. IC 3418 is mingling not with one galaxy, but with the entire Virgo cluster of galaxies 54 million light-years away from Earth. This massive cluster, which contains about 1,500 galaxies and is permeated by hot gas, is pulling in IC 3418, causing it to plunge through the cluster's gas at a rate of 1,000 kilometers per second, or more than 2 million miles per hour. At this incredible speed, the little galaxy's gas is being shoved back into a choppy tail.
The astronomers were able to find this tail with the help of the Galaxy Evolution Explorer. Clusters of massive, young stars speckle the tail, and these stars glow with ultraviolet light that the space telescope can see. The young stars tell scientists that a crucial ingredient for star formation - dense clouds of gas called molecular hydrogen - formed in the wake of this galaxy's plunge. This is the first time astronomers have found solid evidence that clouds of molecular hydrogen can form under the violent conditions present in a turbulent wake.
"IC 3418's tail of star-formation demonstrates that strong turbulence promotes cloud formation," said Mark Seibert, a co-author of the paper and a member of the Galaxy Evolution Explorer science team at the Carnegie Institute for Science in Pasadena.
Hester added that galaxy tails provide the perfect environment for isolating the factors controlling star formation.
"These tails are unique, exotic locations where we can probe the precise mechanisms behind star formation," said Hester. "Understanding star formation is pivotal to understanding the lifecycles of galaxies and the dramatic transformations that some galaxies undergo. We can also study how the process affects the development of planets like our own."
Other authors of the paper are James D. Neill, Ted K. Wyder and Christopher Martin of Caltech; Armando Gil de Paz of the Universidad de Computense de Madrid, Spain; Barry F. Madore of the Carnegie Institute of Washington; David Schiminovich of Columbia University, N.Y., N.Y; and Michael Rich of UCLA.
Caltech leads the Galaxy Evolution Explorer mission and is responsible for science operations and data analysis. NASA's Jet Propulsion Laboratory in Pasadena manages the mission and built the science instrument. The mission was developed under NASA's Explorers Program managed by the Goddard Space Flight Center, Greenbelt, Md. Researchers sponsored by Yonsei University in South Korea and the Centre National d'Etudes Spatiales (CNES) in France collaborated on this mission.
Graphics and additional information about the Galaxy Evolution Explorer is online at http://www.nasa.gov/galex/ and http://www.galex.caltech.edu .
View my blog's last three great articles...
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Mobile Phone Lost
i lost my mobile phone so i lost lot of contacts so i am now under very risky condition how can i find that ,please help me to detect the phone by giving some tips
El Paraiso is the Most Famous Beach in Tulum, Mexico
The small oceanfront town of Tulum, Mexico is perhaps most famous for its beaches, and none more so than El Paraiso Beach. The first thing I noticed about El Paraiso was its luxuriant swath of palm trees. Many of the beaches that stretch for miles on the Maya Riviera are all but devoid of shade, but at El Paraiso palms cluster thickly at the back of the beach and scatter toward the ocean, providing ample shade for the beach bar and restaurant, as well as for lounge chairs and mattresses that can be rented for the day.
Beach bars and shade palms back this lovely beach in Tulum
The next thing I noticed was the sand itself. Sugar fine, pure white, and always cool to the touch, it was the most gorgeous sand that I had ever seen. It was so perfect that I rubbed it all over my body several times that day. After rinsing off in the ocean my skin gleamed as if I’d paid for a pricey salt scrub exfoliation. And the ocean was pure bliss: gorgeous turquoise water so clear I could see every ripple on the bottom, gently lapping waves with an occasional larger wave that allowed me to body surfing back to shore, and a temperature just right – not warm like bathwater, but not the least bit chilly.
Magnificent white sand and turquoise water
Though I could have rented a lounge chair for about $5 per day; or a round vinyl-covered bed with a table, chairs and umbrella rent for about $15, I wanted to be near the shore and in touch with the sand, so I simply spread a beach towel and laid on the ground. Had I needed them, there were public showers and a bathroom in the restaurant behind the beach area. I opted not to eat at the restaurant because I’d had reports that it was not the best choice and the heavy beat music that blared from huge speakers at the bar would have intruded on my tranquility, but the music was enjoyable from my spot at the water’s edge and beach vendors kept me supplied with plastic glasses full of fresh peeled mangoes and pineapple.
El Paraiso Beach is also the site of Extreme Kite Boarding School. Located among the trees on the south end of the beach, this company offers lessons in kite boarding for those who crave more adventure than lounging on a beach for the entire day. As for me, I was content to watch fluffy clouds scud across the sky and seabirds glide gracefully on thermal updrafts while I munched on another strip of mango.
Photo Credit: Barbara Weibel
Article by Barbara Weibel of Hole In The Donut Travels
Crossing the Border
On Thursday we left Kunnurra and drove off to Lake Argyle. Dad and I went out to the deep very very deep water with our goggles and flippers. We saw heaps of different kinds of fish. Some looked like sword fish they were gar fish and some looked like sharks catfish . They were amongst an underwater forest of water weeds. When daddy dived down it was really deep except I could still se him
catch up
so lets see...the second day in paris we went for the louve...awesome..and we took the subway..quicker.....afterwards a little shopping at the stalls they have along the banks of the river...got some nice postcards and smallish pictures of paintings of all over paris...will make a nice collage on the wall. we were going to go see the orsay for free the last hour its open....and then the cluny mu
Seal Colony Pancake Rocks Blowholes
the title says it all.....
Do you know how banning fishing came about
Em Ma took us to the Summer Palace the residence of the emperors during the hot Beijing summers. The most interesting part of the Summer Palace history is the story of the Dragon Lady. After her husband died she ruled through her young son and when he died through her nephew. She wasn't a very nice lady but she did have a lot of power.The Summer Palace is located around a lake shaped like
Aspen Tours Colorado
View from National Monument in Colorado tour Aspen Shuttles
The Canyon is Grand
Wow if you ever have an opportunity to travel to the Grand Canyon take it. It lives up to all they hype. As soon as you step to the edge the canyon just opens up. It is hard to take it all in and the pictures are always different because the light changes.The train trip was great. We arrived at the depot and were entertained by a group of wildwest cowboys. The interesting part is that these
Flat William
Blogging For Becky Becky thought she might provide an entry explaining why she is carrying around a cardboard cutout that resembles her grandson and is in a number of our photos. Becky... Alas it has not manifested. So here i am then trying to explain what i am not entirely clear about myself. Those of you with children undoubtedly know what i don't. But my understanding is that there is
Namaste DelhiNihau Shanghai
So after 120 days i have left india.There were few highlights of my final few days in delhi i revisited India gate with Ali and got my fill of Masala Dosa brain curry and other favourites including plenty of sweets. Pahar Ganj still looks like a bomb has hit it its still hideously polluted and the temperature is in the high 40's. So after jumping in a taxi to IGI airport i finally got some e
Week 1 Continued
Weds 9th June.Woke up to thunder and it was chucking it down So I did all my coaching indoors with the lil kids. In the afternoon me and my family and some of the other coaches all went to the Pro American Football Hall of Fame. It was really good and made me want to go and watch a live game My family are Pitsburg steelers fans so I am now The rain had finally stopped for my evening sessi
Photos from week 1 Website Links to Newspaper I was in
This is the link to the article that I was quoted inhttpnl.newsbank.comnlsearchweArchivespactiondocpdocid1305E1D51FD5B438pdocnum5pthemegatehousessiteRCOCpproductRCOCAnd this is the link to the photos httpcantonrep.mycapture.commycapturefolder.aspevent1022740CategoryID31076ListSubAlbums0Photos should be below this paragraph