$ Google estar?a realizando acuerdos para crear nuevas tabletas de bajo costo para competir con el Kindle de Amazon y el iPad nuevo de Apple, seg?n inform? The Wall Street Journal.
Estas llevar?an la marca de Google, tal como ya lo hacen tel?fonos como el Galaxy Nexus, fabricado por Samsung y cuya versi?n de Android fue especialmente desarrollada por el gigante inform?tico.
Las tabletas se vender?an directamente a trav?s de una tienda en l?nea y es posible que uno de los primeros fabricantes en tener una disponible a la venta sea la taiwanesa AsusTek, aunque los acuerdos ya existentes con Samsung indican que tambi?n podr?an fabricar un modelo.
La adopci?n de equipos de bajo costo como el Kindle Fire de Amazon, que se ofrece a US$199, adem?s del lanzamiento del nuevo iPad, ha impactado negativamente la venta de tabletas dotadas de la ?ltima versi?n de Android.
Mientras que su fuerte son los tel?fonos m?viles, el segmento de tabletas no ha logrado una gran penetraci?n, como se ha reflejado en las ventas de modelos como el Galaxy Note y el Motorola Xoom.
Religious leaders say churches should be promoting awareness of one of Australia's most difficult issues - the prevalence of depression and suicide. Source: AdelaideNow
CHURCHES have an important role to play in assisting those affected by suicide and depression, Australian religious leaders say.
The Uniting Church SA's solidarity and justice officer, the Rev Sarah Williamson, said churches should promote awareness of what she?described as one of Australia's most significant cultural issues.
The Australian Bureau of Statistics' latest Causes of Death report, released last week, states there were 2361 deaths by suicide in Australia in 2010 - an increase of 480 deaths from 2007.
Ms Williamson said the church's Suicide - It's No Secret campaign, now in its second year, aimed to promote discussion about suicide prevention and awareness, particularly in Australia's rural and indigenous communities.
"With myself and our moderator both being from a rural area, we had just buried too many people from suicide and really wanted to try to make a significant difference in how people approach the issue of suicide, with the view that suicide is a difficult issue to talk about," she said.
"We wanted to create a campaign that would encourage conversation and destigmatise the issues around it so we could potentially save lives."
She said mishandling of families of suicide victims in the past had contributed to the shame associated with it, but churches were now better educated about how to deal with such trauma.
Greater mental health support for rural residents was needed and indigenous communities were suffering the most, she said.
"I suspect we're going to learn a lot more in the future about indigenous suicide rates because they are higher than anything," she said.
"The best way to go is to upskill locals - if we don't have psychologists in rural areas, the best we can do is teach neighbours how to look after neighbours."
Salvation Army Hope for Life liaison officer Hennie Watts said churches must do all they can to promote discussion about suicide prevention.
The Salvation Army has a free training program - QPR Suicide Prevention - available on its website.
For information about suicide prevention contact Lifeline on 13?11?14 or SANE Helpline on 1800?18?SANE (7263)
How black holes growPublic release date: 1-Apr-2012 [ | E-mail | Share ]
Contact: Lee Siegel lee.siegel@utah.edu 801-581-8993 University of Utah
New study indicates they eat binary star partners
SALT LAKE CITY -- A study led by a University of Utah astrophysicist found a new explanation for the growth of supermassive black holes in the center of most galaxies: they repeatedly capture and swallow single stars from pairs of stars that wander too close.
Using new calculations and previous observations of our own Milky Way and other galaxies, "we found black holes grow enormously as a result of sucking in captured binary star partners," says physics and astronomy Professor Ben Bromley, lead author of the study, which is set for online publication April 2 in Astrophysical Journal Letters.
"I believe this has got to be the dominant method for growing supermassive black holes," he adds. "There are two ways to grow a supermassive black hole: with gas clouds and with stars. Sometimes there's gas and sometimes there is not. We know that from observations of other galaxies. But there are always stars."
"Our mechanism is an efficient way to bring a star to a black hole," Bromley says. "It's really hard to target a single star at a black hole. It's a lot easier to throw a binary at it," just as it's more difficult to hit a target using a slingshot, which hurls a single stone, than with a bola, which hurls two weights connected by a cord.
A binary pair of stars orbiting each other "is essentially a single object much bigger than the size of the individual stars, so it is going to interact with the black hole more efficiently," he explains. "The binary doesn't have to get nearly as close for one of the stars to get ripped away and captured."
But to prove the theory will require more powerful telescopes to find three key signs: large numbers of small stars captured near supermassive black holes, more observations of stars being "shredded" by gravity from black holes, and large numbers of "hypervelocity stars" that are flung from galaxies at more than 1 million mph when their binary partners are captured.
Bromley, a University of Utah astrophysicist, did the study with astronomers Scott Kenyon, Margaret Geller and Warren Brown, all of the Smithsonian Astrophysical Observatory in Cambridge, Mass. The study was funded by both institutions.
What Does a Supermassive Black Hole Eat: Gas or Stars?
Black holes are objects in space so dense that not even light can escape their gravity, although powerful jets of light and energy can be emitted from a black hole's vicinity as gas and stars are sucked into it.
Small black holes result from the collapse of individual stars. But the centers of most galaxies, including our own Milky Way, are occupied by what are popularly known as "supermassive" black holes that contain mass ranging from 1 million to 10 billion stars the size of our sun.
Astrophysicists long have debated how supermassive black holes grew during the 14 billion years since the universe began in a great expansion of matter and energy named the Big Bang. One side believes black holes grow larger mainly by sucking in vast amounts of gas; the other side says they grow primarily by capturing and sucking in stars.
Just last month, other researchers published a theory that a black hole sucks in "food" by tipping its "plates" two tilted gas disks colliding as they orbit the black hole in a way that makes the speeding gas slow down so the black hole can swallow it.
Bromley says that theory overcomes a key problem: gas flows into black holes inefficiently. "But are misaligned gas disks common enough to be important for black hole growth?" he asks. "It's fair to say that gas contributes to the growth of black holes, but it is still uncertain how."
The new theory about binary stars a pair of stars that orbit each other arose from Bromley's earlier research to explain hypervelocity stars, which have been observed leaving our Milky Way galaxy at speeds ranging from 1.1 million to 1.8 million mph, compared with the roughly 350,000 mph speed of most stars.
Munching Binaries: One is Captured, One Speeds Away
"The hypervelocity stars we see come from binary stars that stray close to the galaxy's massive black hole," he says. "The hole peels off one binary partner, while the other partner the hypervelocity star gets flung out in a gravitational slingshot."
"We put the numbers together for observed hypervelocity stars and other evidence, and found that the rate of binary encounters [with our galaxy's supermassive black hole] would mean most of the mass of the galaxy's black hole came from binary stars," Bromley says. "We estimated these interactions for supermassive black holes in other galaxies and found that they too can grow to billions of solar masses in this way."
As many as half of all stars are in binary pairs, so they are plentiful in the Milky Way and other galaxies, he adds. But the study assumed conservatively that only 10 percent of stars exist in binary pairs.
The new study looked at each step in the process of a supermassive black hole eating binary stars, and calculated what would be required for the process to work in terms of the rates at which hypervelocity stars are produced, binary partners are captured, the captured stars are bound to the black hole in elongated orbits and then sucked into it.
The scientists then compared the results with actual observations of supermassive black holes, stars clustering near them and "tidal disruption events" in which black holes in other galaxies are seen to shred stars while pulling them into the hole.
"It fits together, and it works," Bromley says. "When we look at observations of how stars are accumulating in our galactic center, it's clear that much of the mass of the black hole likely came from binary stars that were torn apart."
He refers to the process of a supermassive black hole capturing stars from binary pairs as "filling the bathtub." Once the tub the area near the black hole is occupied by a cluster of captured stars, they go "down the drain" into the black hole over millions of years. His study shows the "tub" fills at about the same rate it drains, meaning stars captured by a supermassive black hole eventually are swallowed.
The study's key conclusions:
-- The theory accurately predicts the rate (one every 1,000 to 100,000 years) at which hypervelocity stars are observed leaving our galaxy and at which stars are captured into the star cluster seen near our galaxy's supermassive black hole.
-- The rate of "tidal disruption events," which are stars being shredded and pulled into supermassive black holes in other galaxies, also matches what the theory predicts, based on the limited number seen since they first were observed in the early 2000s. That rate also is one every 1,000 to 100,000 years.
-- The calculations show how the theory's rate of binary capture and consumption can explain how the Milky Way's supermassive black hole has at least doubled to quadrupled in mass during the past 5 billion to 10 billion years.
When the researchers considered the number of stars near the Milky Way's center, their speed and the odds they will encounter the supermassive black hole, they estimated that one binary star will be torn apart every 1,000 years by the hole's gravity.
During the last 10 billion years, that would mean the Milky Way's supermassive black hole ate 10 million solar masses more than enough to account for the hole's actual size of 4 million solar masses.
"We found a wide range of black hole masses can be explained by this process," Bromley says.
Confirmation of the theory must await more powerful orbiting and ground-based telescopes. To confirm the theory, such telescopes should find many more stars in the cluster near the Milky Way's supermassive black hole (we now see only the brightest ones), a certain rate of hypervelocity stars in southern skies, and more observations of stars being shredded in other galaxies.
###
University of Utah Public Relations
201 Presidents Circle, Room 308
Salt Lake City, Utah 84112-9017
(801) 581-6773 fax: (801) 585-3350
www.unews.utah.edu
[ | E-mail | Share ]
?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
How black holes growPublic release date: 1-Apr-2012 [ | E-mail | Share ]
Contact: Lee Siegel lee.siegel@utah.edu 801-581-8993 University of Utah
New study indicates they eat binary star partners
SALT LAKE CITY -- A study led by a University of Utah astrophysicist found a new explanation for the growth of supermassive black holes in the center of most galaxies: they repeatedly capture and swallow single stars from pairs of stars that wander too close.
Using new calculations and previous observations of our own Milky Way and other galaxies, "we found black holes grow enormously as a result of sucking in captured binary star partners," says physics and astronomy Professor Ben Bromley, lead author of the study, which is set for online publication April 2 in Astrophysical Journal Letters.
"I believe this has got to be the dominant method for growing supermassive black holes," he adds. "There are two ways to grow a supermassive black hole: with gas clouds and with stars. Sometimes there's gas and sometimes there is not. We know that from observations of other galaxies. But there are always stars."
"Our mechanism is an efficient way to bring a star to a black hole," Bromley says. "It's really hard to target a single star at a black hole. It's a lot easier to throw a binary at it," just as it's more difficult to hit a target using a slingshot, which hurls a single stone, than with a bola, which hurls two weights connected by a cord.
A binary pair of stars orbiting each other "is essentially a single object much bigger than the size of the individual stars, so it is going to interact with the black hole more efficiently," he explains. "The binary doesn't have to get nearly as close for one of the stars to get ripped away and captured."
But to prove the theory will require more powerful telescopes to find three key signs: large numbers of small stars captured near supermassive black holes, more observations of stars being "shredded" by gravity from black holes, and large numbers of "hypervelocity stars" that are flung from galaxies at more than 1 million mph when their binary partners are captured.
Bromley, a University of Utah astrophysicist, did the study with astronomers Scott Kenyon, Margaret Geller and Warren Brown, all of the Smithsonian Astrophysical Observatory in Cambridge, Mass. The study was funded by both institutions.
What Does a Supermassive Black Hole Eat: Gas or Stars?
Black holes are objects in space so dense that not even light can escape their gravity, although powerful jets of light and energy can be emitted from a black hole's vicinity as gas and stars are sucked into it.
Small black holes result from the collapse of individual stars. But the centers of most galaxies, including our own Milky Way, are occupied by what are popularly known as "supermassive" black holes that contain mass ranging from 1 million to 10 billion stars the size of our sun.
Astrophysicists long have debated how supermassive black holes grew during the 14 billion years since the universe began in a great expansion of matter and energy named the Big Bang. One side believes black holes grow larger mainly by sucking in vast amounts of gas; the other side says they grow primarily by capturing and sucking in stars.
Just last month, other researchers published a theory that a black hole sucks in "food" by tipping its "plates" two tilted gas disks colliding as they orbit the black hole in a way that makes the speeding gas slow down so the black hole can swallow it.
Bromley says that theory overcomes a key problem: gas flows into black holes inefficiently. "But are misaligned gas disks common enough to be important for black hole growth?" he asks. "It's fair to say that gas contributes to the growth of black holes, but it is still uncertain how."
The new theory about binary stars a pair of stars that orbit each other arose from Bromley's earlier research to explain hypervelocity stars, which have been observed leaving our Milky Way galaxy at speeds ranging from 1.1 million to 1.8 million mph, compared with the roughly 350,000 mph speed of most stars.
Munching Binaries: One is Captured, One Speeds Away
"The hypervelocity stars we see come from binary stars that stray close to the galaxy's massive black hole," he says. "The hole peels off one binary partner, while the other partner the hypervelocity star gets flung out in a gravitational slingshot."
"We put the numbers together for observed hypervelocity stars and other evidence, and found that the rate of binary encounters [with our galaxy's supermassive black hole] would mean most of the mass of the galaxy's black hole came from binary stars," Bromley says. "We estimated these interactions for supermassive black holes in other galaxies and found that they too can grow to billions of solar masses in this way."
As many as half of all stars are in binary pairs, so they are plentiful in the Milky Way and other galaxies, he adds. But the study assumed conservatively that only 10 percent of stars exist in binary pairs.
The new study looked at each step in the process of a supermassive black hole eating binary stars, and calculated what would be required for the process to work in terms of the rates at which hypervelocity stars are produced, binary partners are captured, the captured stars are bound to the black hole in elongated orbits and then sucked into it.
The scientists then compared the results with actual observations of supermassive black holes, stars clustering near them and "tidal disruption events" in which black holes in other galaxies are seen to shred stars while pulling them into the hole.
"It fits together, and it works," Bromley says. "When we look at observations of how stars are accumulating in our galactic center, it's clear that much of the mass of the black hole likely came from binary stars that were torn apart."
He refers to the process of a supermassive black hole capturing stars from binary pairs as "filling the bathtub." Once the tub the area near the black hole is occupied by a cluster of captured stars, they go "down the drain" into the black hole over millions of years. His study shows the "tub" fills at about the same rate it drains, meaning stars captured by a supermassive black hole eventually are swallowed.
The study's key conclusions:
-- The theory accurately predicts the rate (one every 1,000 to 100,000 years) at which hypervelocity stars are observed leaving our galaxy and at which stars are captured into the star cluster seen near our galaxy's supermassive black hole.
-- The rate of "tidal disruption events," which are stars being shredded and pulled into supermassive black holes in other galaxies, also matches what the theory predicts, based on the limited number seen since they first were observed in the early 2000s. That rate also is one every 1,000 to 100,000 years.
-- The calculations show how the theory's rate of binary capture and consumption can explain how the Milky Way's supermassive black hole has at least doubled to quadrupled in mass during the past 5 billion to 10 billion years.
When the researchers considered the number of stars near the Milky Way's center, their speed and the odds they will encounter the supermassive black hole, they estimated that one binary star will be torn apart every 1,000 years by the hole's gravity.
During the last 10 billion years, that would mean the Milky Way's supermassive black hole ate 10 million solar masses more than enough to account for the hole's actual size of 4 million solar masses.
"We found a wide range of black hole masses can be explained by this process," Bromley says.
Confirmation of the theory must await more powerful orbiting and ground-based telescopes. To confirm the theory, such telescopes should find many more stars in the cluster near the Milky Way's supermassive black hole (we now see only the brightest ones), a certain rate of hypervelocity stars in southern skies, and more observations of stars being shredded in other galaxies.
###
University of Utah Public Relations
201 Presidents Circle, Room 308
Salt Lake City, Utah 84112-9017
(801) 581-6773 fax: (801) 585-3350
www.unews.utah.edu
[ | E-mail | Share ]
?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Demand for hand-scraped hardwood ladders, and seems not soon disappear. If you plan to install new flooring, you get on board with this trend? If yes, scraped the market and the opportunities at hand hardwood now an enormous size, and includes virtually all types of solid and engineered varieties. In addition, there are established or developed and engineered flooring is unfinished or better for your house, what are the options?
Classic and rustic style are both possibilities. Although texture is a driving force behind the demand, so both types have different properties. Classic is smooth, with few brands like structure and character. Rustic, on the other hand, a higher incidence of these visual features of knots, heavy grain mineral strips and the dots on each shelf carefully.
Buyers should look for counterfeiting. Although laminate mimics a scratched and well formed, is an option that used flooring considered a lower quality version. Made from genuine hardwood, is determined by his ailing labels ? all from one machine pressed into the surface.
In itself a troubled board appears, but when installed side by side, see the pattern. A lack of uniformity and repetition is a common destination for hand-scraped hardwood, but despair at the end have the opposite effect.
For authentic products that are structured in style, finish and split with age. Textured often go ?wire brush?, ?hand cut? or ?hand-hewn and rough sawn.? Handmade is the least structured, with a rough surface is modeled, wire brush, indicating that the grain is highlighted, and removed the pin. Hand-hewn and sawn, live on the other hand, his name, as structured, has this man seen as even lines.
Finish creating an illusion of depth. French hemorrhage, characterized by a lower beveled edges used on the darker surface of the joints, and gives a deeper look. Age, with a degree of finish application. Going ?old time-worn? or ?old? This diversity includes aging hardwood and use a dark stain, highlighting cereal or contours.
Pre-scraped products are not the only possibilities for hand scraped spread out there. Hardwood, in fact, looking desperate for the ultimate home uneven with a lack of repetition to create. For custom troubling unfinished hardwood is installed first and then get a professional to give the rustic, rugged character. Although techniques vary, hardwood with antique nails, chains, salted, bleached or confirmation.
It?s an age-old question that will only get more and more intense in the coming year as the Xbox 360 is in full swing and the PS3 and Revolution release. Which is better? What system is right for me? well, I would suggest both, but if you have to choose one or the other then you have to consider a few things.
Price is definitely a big issue. I mean, when?s the last time you didn?t even bat an eye when are buying something 500 bucks or more? The bottom line: Computer gaming is more expensive. Why? because computers aren?t made just for games. They are calculators, word processors, Internet navigators, music players, movie watchers, and photo editors. They are much more than a gaming machine. Consoles, on the other hand, generally aren?t. It?s only recently that consoles have gone online starting with the Dreamcast and I haven?t seen anyone printing off spreadsheets or book reports from one yet. Consoles are purely for gaming and run between 100-500 bucks. PCs on the other hand are much more than a gaming machine and run between 1,500-3,000 dollars and need to be upgraded every now and again to play the newest and greatest games.
Genre is an issue. if you are a Real Time Strategy fan and only have a console, I mourn for you. and if you are a platformer fan, then computer gaming will be a sad mistake. Genre makes a big deal because of the controller vs. keyboard/mouse issue. different games play much better on the different configurations. Computer gaming is best for Real Time Strategy (RTS) games, first Person Shooters (FPS), Massively Multiplayer Online Role Playing Games (MMORG), Flight Simulation games, and Point and Click Adventure games. The consoles on the other hand are better for Fighting games, Action/Adventure games, Platformers, Role Playing Games (RPG), and Sports games.
Tech savvy can possibly be an issue. Computers are a little more unstable than consoles. I mean, when?s the last time you saw a Playstation lock up or get a blue screen of death? Never, right? The same thing comes in here. some computer games might be a little stubborn to set up the way your computer likes it or your computer might not meet the system requirements. Consoles, on the other hand, don?t have that problem. The people designing the games have to fit the requirements of the console so that you don?t have a problem. if you have a basic knowledge of computers, you?ll be fine. if you don?t, then a console might be better for you.
So as I?ve explained, if you want more than a gaming system for school and work or you just like gaming genres like RTS and MMORG games, I would go with a PC. if you love platformers, Action/Adventure, or Sports games or your wallet is a tad on the empty side, I?d go with a console. it won?t be able to surf the Internet or help you with anything else, but it?ll play some great games.
If you want a console by the end of this article, then you have 3 options at the moment. You could buy a Gamecube if you like innovation, buy a Xbox if you like the best graphics and FPS games, or buy a PS2 if you want a huge library of games or love fighting games, Action/Adventure games, platformers, and RPG games. You also have another option. You could wait until the Xbox 360 comes out this month and get that or wait until the Nintendo Revolution and PS3 come out next year.
If you want advise on gaming computers and computer gaming, then gaming-computers-authority.com is a great resource for all your questions and even has a tutorial on building your own computer.
Skin cancer develops when DNA in skin cells becomes damaged so that the body cannot repair them, and these damaged cells begin to grow and divide uncontrollably. As the damaged cells multiply, they form a tumor. Since skin cancer generally develops in the epidermis, the outermost layers of skin, a tumor is usually clearly visible. This makes most skin cancers? READ MORE AT: http://www.thesurvivorsclub.org/health/surviving-cancer/skin-cancer?click=tsc_more
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Public release date: 1-Apr-2012
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