Wednesday, March 6, 2013

Totally free Computer Certification Practice Exam And Test Inquiries

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Source: http://www.damm-net.org/blog/2013/03/totally-free-computer-certification-practice-exam-and-test-inquiries/

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New evidence that comets could have seeded life on Earth

Mar. 5, 2013 ? t's among the most ancient of questions: What are the origins of life on Earth?

A new experiment simulating conditions in deep space reveals that the complex building blocks of life could have been created on icy interplanetary dust and then carried to Earth, jump-starting life.

Chemists from the University of California, Berkeley, and the University of Hawaii, Manoa, showed that conditions in space are capable of creating complex dipeptides -- linked pairs of amino acids -- that are essential building blocks shared by all living things. The discovery opens the door to the possibility that these molecules were brought to Earth aboard a comet or possibly meteorites, catalyzing the formation of proteins (polypeptides), enzymes and even more complex molecules, such as sugars, that are necessary for life.

"It is fascinating to consider that the most basic biochemical building blocks that led to life on Earth may well have had an extraterrestrial origin," said UC Berkeley chemist Richard Mathies, coauthor of a paper published online last week and scheduled for the March 10 print issue of The Astrophysical Journal.

While scientists have discovered basic organic molecules, such as amino acids, in numerous meteorites that have fallen to Earth, they have been unable to find the more complex molecular structures that are prerequisites for our planet's biology. As a result, scientists have always assumed that the really complicated chemistry of life must have originated in Earth's early oceans.

In an ultra-high vacuum chamber chilled to 10 degrees above absolute zero (10 Kelvin), Seol Kim and Ralf Kaiser of the Hawaiian team simulated an icy snowball in space including carbon dioxide, ammonia and various hydrocarbons such as methane, ethane and propane. When zapped with high-energy electrons to simulate the cosmic rays in space, the chemicals reacted to form complex, organic compounds, specifically dipeptides, essential to life.

At UC Berkeley, Mathies and Amanda Stockton then analyzed the organic residues through the Mars Organic Analyzer, an instrument that Mathies designed for ultrasensitive detection and identification of small organic molecules in the solar system. The analysis revealed the presence of complex molecules -- nine different amino acids and at least two dipeptides -- capable of catalyzing biological evolution on earth.

The research was supported by the National Science Foundation and the Mathies Royalty Fund at UC Berkeley.

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The above story is reprinted from materials provided by University of California - Berkeley.

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Journal Reference:

  1. R. I. Kaiser, A. M. Stockton, Y. S. Kim, E. C. Jensen, R. A. Mathies. ON THE FORMATION OF DIPEPTIDES IN INTERSTELLAR MODEL ICES. The Astrophysical Journal, 2013; 765 (2): 111 DOI: 10.1088/0004-637X/765/2/111

Note: If no author is given, the source is cited instead.

Disclaimer: Views expressed in this article do not necessarily reflect those of ScienceDaily or its staff.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/~3/K5cJrx_Y3No/130305131412.htm

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Tuesday, March 5, 2013

Pre-caffeine tech: 4,000 lattes, matzoh crafts!?

Our pre-caffeine roundup is a collection of the hottest, strangest, and most amusing stories of the morning.

Mobile World Congress remains the world?s biggest dedicated mobile technology event, and this year?s show saw more than 70,000 people converge in Barcelona to find out what?s next in smartphones: Here are eight of them.

Speaking of phones, does telecommuting really hurt employee performance? Let's find out!

Bill Gates is the second richest person on the planet. Guess who's first!

In Apple news, expect the iWatch later this year, according to this report.

Also: Because Of Steve Jobs's first public iPhone call, Starbucks still gets orders for 4,000 lattes.

A photo booth is a nice addition to any party, but when you combine one with an iPad and trendy animated GIFs, you'll have a line around the block trying to get in. PHHHOTO offers just that.

Twitter will produce the name for humanity's furry little ancestor! Some early entries include: Dwight Shrewte, Shrewquille O'Neal, Tooth-billed ratypus,Katherine, Steve, and Paw.

The New Yorker has a profile of Aaron Swartz. And The Atlantic has a very personal look inside the federal investigation and prosecution he was dealing with at the time of his death.

In Facebook news, here comes it's phone-friendly News Feed!

In closing, and just in time for Passover: 17 matzoh-inspired crafts you can own!

Compiled by Helen A.S. Popkin, who invites you to join her on Twitter and/or Facebook.

Source: http://www.nbcnews.com/technology/technolog/pre-caffeine-tech-4-000-lattes-matzoh-crafts-1C8673442

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Spanish solar energy: A model for the future?

Spanish solar energy: A model for the future? [ Back to EurekAlert! ] Public release date: 4-Mar-2013
[ | E-mail | Share Share ]

Contact: Alexander Brown
akbrownnyc@gmail.com
212-620-8063
Springer Science+Business Media

Solar energy holds promise, but fossil fuel subsidies must be reduced

There is no free fuel. Whether you drill for and refine oil, or manufacture and maintain a panel to collect solar energy and convert it into electricity, it takes energy to make energy. In Spain's Photovoltaic Revolution: The Energy Return on Investment, authors Pedro A. Prieto of the Asociacin para el Estudio de los Recursos Energticos, and Charles A.S. Hall of the State University of New York, examine whether solar power can produce enough surplus energy to meet society's energy requirements in a sustainable manner.

To assess solar power's potential as a viable alternative energy source, Prieto and Hall examine all energy inputs, which the authors refer to as "fossil fuel subsidies," at a massive deployment of solar modules connected to the electricity grid in sunny Spain. In an eye-opening analysis of the Energy Return on the Energy Invested (EROEI or EROI), the authors discover that solar power is not nearly as "green" as many believe.

Spain's Photovoltaic Revolution is based on Prieto's first-hand experience as Chief Engineer and consultant on several large-scale solar projects in Spain, and Hall's unparalleled experience as the originator of the concept in the application of EROI. Their analysis reveals the large fossil fuel subsidies that may remain hidden at various stages of the life cycle of a solar plant, and, in fact, in nearly all aspects of today's economy. The authors also provide a breakdown of the EROI that must be met in order for different aspects of society to exist and flourish. These layers include the advanced functions of today's modern civilizations, such as education, health care, and complex administrative and regulatory structures, as well as the most basic building blocks of any society, such as food production and transportation.

Prieto and Hall make it clear that while progress has been made, much additional work is required if solar energy is to be a key to significantly reducing our dependence on fossil fuels. The authors conclude, "As fossil fuel supplies dwindle, and the costs of bringing these fuels to market continue to rise, we may have one only shot at using the surpluses of the fossil-fuelled economy to find suitable alternatives. Following the precautionary principle, understanding the true EROI for society is essential before going massively into any alternative energy source."

The effects of diminishing energy returns from fossil fuel supplies can already be seen in the downward bend of economic growth curves in industrial economies. Whether there are viable alternatives that can sustain our way of life remains to be seen. Spain's Photovoltaic Revolution is an important book for anyone concerned with this future, and exposes the complexity of our energy conundrum in stark and revealing detail.

###

Reference

Prieto, Pedro A. and Charles A.S. Hall. Spain's Photovoltaic Revolution: The Energy Return on Investment. Springer 2013. ISBN: 978-1-4419-9436-3 (Print) 978-1-4419-9437-0 (Online).


[ Back to EurekAlert! ] [ | E-mail | Share 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.


Spanish solar energy: A model for the future? [ Back to EurekAlert! ] Public release date: 4-Mar-2013
[ | E-mail | Share Share ]

Contact: Alexander Brown
akbrownnyc@gmail.com
212-620-8063
Springer Science+Business Media

Solar energy holds promise, but fossil fuel subsidies must be reduced

There is no free fuel. Whether you drill for and refine oil, or manufacture and maintain a panel to collect solar energy and convert it into electricity, it takes energy to make energy. In Spain's Photovoltaic Revolution: The Energy Return on Investment, authors Pedro A. Prieto of the Asociacin para el Estudio de los Recursos Energticos, and Charles A.S. Hall of the State University of New York, examine whether solar power can produce enough surplus energy to meet society's energy requirements in a sustainable manner.

To assess solar power's potential as a viable alternative energy source, Prieto and Hall examine all energy inputs, which the authors refer to as "fossil fuel subsidies," at a massive deployment of solar modules connected to the electricity grid in sunny Spain. In an eye-opening analysis of the Energy Return on the Energy Invested (EROEI or EROI), the authors discover that solar power is not nearly as "green" as many believe.

Spain's Photovoltaic Revolution is based on Prieto's first-hand experience as Chief Engineer and consultant on several large-scale solar projects in Spain, and Hall's unparalleled experience as the originator of the concept in the application of EROI. Their analysis reveals the large fossil fuel subsidies that may remain hidden at various stages of the life cycle of a solar plant, and, in fact, in nearly all aspects of today's economy. The authors also provide a breakdown of the EROI that must be met in order for different aspects of society to exist and flourish. These layers include the advanced functions of today's modern civilizations, such as education, health care, and complex administrative and regulatory structures, as well as the most basic building blocks of any society, such as food production and transportation.

Prieto and Hall make it clear that while progress has been made, much additional work is required if solar energy is to be a key to significantly reducing our dependence on fossil fuels. The authors conclude, "As fossil fuel supplies dwindle, and the costs of bringing these fuels to market continue to rise, we may have one only shot at using the surpluses of the fossil-fuelled economy to find suitable alternatives. Following the precautionary principle, understanding the true EROI for society is essential before going massively into any alternative energy source."

The effects of diminishing energy returns from fossil fuel supplies can already be seen in the downward bend of economic growth curves in industrial economies. Whether there are viable alternatives that can sustain our way of life remains to be seen. Spain's Photovoltaic Revolution is an important book for anyone concerned with this future, and exposes the complexity of our energy conundrum in stark and revealing detail.

###

Reference

Prieto, Pedro A. and Charles A.S. Hall. Spain's Photovoltaic Revolution: The Energy Return on Investment. Springer 2013. ISBN: 978-1-4419-9436-3 (Print) 978-1-4419-9437-0 (Online).


[ Back to EurekAlert! ] [ | E-mail | Share 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.


Source: http://www.eurekalert.org/pub_releases/2013-03/ssm-sse030413.php

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Monday, March 4, 2013

Assad accuses Britain, US of supporting terrorism

AMMAN, Jordan (AP) ? Syria's president harshly criticized U.S. and British aid to rebels and set harsh terms for talking to his opponents in a newspaper interview published Sunday, as fighting raged across the country.

On the battlefield, rebels made significant gains in the heavily contested northeastern Syrian, capturing a police academy complex west of Aleppo and storming the central prison in the city of Raqqa, as well as a border crossing along Syria's frontier with Iraq, activists said.

President Bashar Assad took a tough line against his opponents in the interview with London's Sunday Times, dialing back earlier hints of flexibility about talks.

He said he is ready for dialogue with armed rebels and militants, but only if they surrender their weapons. Recently his foreign minister offered such talks but left the question of laying down arms unanswered. Assad's regime often refers to rebels as "terrorists."

"We are ready to negotiate with anyone, including militants who surrender their arms. We are not going to deal with terrorists who are determined to carry weapons, to terrorize people, to kill civilians, to attack public places or private enterprise and to destroy the country," Assad said. "We fight terrorism."

Most opposition groups have rejected talks with Assad's regime, with some demanding that he resign before talks can begin.

Assad said that he would not step down or go into exile. "No patriotic person will think about living outside his country. I am like any other patriotic Syrian," he said.

The interview was conducted in Damascus last week and was published Sunday, coinciding with U.S. Secretary of State John Kerry's first foreign tour.

Kerry met with Syrian rebels in Italy Thursday. He has announced a $60 million package of non-lethal U.S. aid to the rebels.

Assad said the "intelligence, communication and financial assistance being provided is very lethal."

Assad also bitterly criticized Britain. He said instead of pushing for peace talks, British Prime Minister David Cameron's "naive, confused, unrealistic" government was trying to end a European Union arms embargo so that the rebels can be supplied with weapons.

"We do not expect an arsonist to be a firefighter," he said, dismissing any notion that Britain could help end the civil war, which has killed more than 70,000 people.

"How can we ask Britain to play a role while it is determined to militarize the problem? How can we expect them to make the violence less while they want to send military supply to the terrorists?" he asked.

On Thursday, British Foreign Secretary William Hague promised to increase support for the Syrian opposition, including equipment supplies and humanitarian assistance.

Assad said Hague was misguided in his offer of assistance to rebels. "The British government wants to send military aid to moderate groups in Syria, knowing all too well that such moderate groups do not exist in Syria," he said.

"We all know that we are now fighting al-Qaida, or Jabhat al-Nusra, an offshoot of al-Qaida, and other groups of people indoctrinated with extreme ideologies," he said.

Assad warned that arming the rebels would have grave consequences.

"Syria lies at the fault line geographically, politically, socially and ideologically. So playing with this fault line will have serious repercussions all over the Middle East," he said.

He vowed to avenge from Israel for an airstrike on a suspected site ? which Syria said was a research center ? in Damascus last month.

"Retaliation does not mean missile for missile or bullet for bullet," he said. "Our own way does not have to be announced."

___

Associated Press writers Barbara Surk in Beirut and Maamoun Youssef in Cairo contributed.

Source: http://news.yahoo.com/assad-accuses-britain-us-supporting-terrorism-092616788.html

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Analysis - Long haul ahead for Britain's struggling economy

LONDON (Reuters) - When the financial crisis began to spread five years ago, British coffee machine-maker Fracino raced to get ahead of it.

From the firm's base in Birmingham, it carved out new markets in the Middle East, Asia and even Italy for its cappuccino and espresso machines which it proudly stamps with the British flag.

Last year Fracino generated 25 percent of its turnover abroad, up from just 2 percent before the crisis.

That is the kind of transformation the Conservative-led government promised for the broader UK economy as it took office in 2010, after the near collapse of the country's huge banking sector and the plunge in housing prices.

But in the last few months, things have taken a worrying turn at Fracino. Clients at home and abroad have started to demand its cheaper machines, shunning the more expensive models and slowing the company's revenue growth.

"They are just buying the machines that will do the job," said managing director Adrian Maxwell.

"Until something happens for people to take their foot off the brake and feel a little bit more relaxed about spending again, it's long going to be a long, hard haul."

Nearly three years after Britain's Conservative-led government vowed to restore the country to financial health with a round of deep spending cuts, the economy looks stuck in a rut and could already be in its third recession since 2008.

Public debt is set to carry on rising for another three years, a blow to the ruling coalition facing parliamentary elections in 2015 and which has made austerity the centrepiece of its economic policy.

The creation of more than 1 million jobs in the last two years has surprised economists. But paltry wage growth for most wage-earners has been the price of higher employment.

And the ambitious-sounding plans of 2010 to rebalance the economy with a focus on exports as a new driver of growth have so far come to little, hampered by the economic crisis that has hammered Britain's main trading partners in Europe.

Even with a 20 percent slide in the value of the British pound since the onset of the financial crisis in 2007, Britain's share of world exports has fallen by about 6 percent since then, according to data from the Organization for Economic Cooperation and Development.

"What is really striking about the UK is that it has had a quite important depreciation of the pound and still it hasn't had a big increase in exports," said Christophe Andre, an economist with the OECD.

Only Italy had worse overall growth among the industrialised Group of Seven nations in the same period, he said.

MOODY'S SEES SLOW GROWTH

The February 22 downgrade of Britain's triple-A rating underscored how long the economic gloom will probably last.

Moody's said it expected sluggish growth would stretch into the second half of the decade, offering the coalition government little hope of a pickup before the elections.

Forecasts used by the government predict the economy will grow by 1.2 percent in 2013 and 2 percent next year.

But estimates like that have routinely proven too optimistic. A year ago, the same official forecasters were predicting the economy would grow 2.7 percent in 2014.

A Reuters poll of private-sector economists last month predicted growth of 1.6 percent next year, better than the 1 percent growth forecast for the euro zone and only a touch slower than the forecast for Germany, but worse than the British government expects.

Some say the steady drip of weak economic data recently means Britain's outlook is deteriorating.

Not only did the economy shrink slightly in the last three months of 2012 but investment by businesses fell by 1.2 percent, a potential warning sign of more weakness to come. Factory activity shrank sharply in February, data showed on Friday.

"The optimistic view is that everything plays out nicely and we get back towards trend rates of growth. But there are structural factors pulling down on growth and they aren't going away," said Philip Rush, a UK economist with Nomura.

He thinks British gross domestic product will grow by just 0.4 percent this year by and 0.8 percent in 2014, held back in large part by the country's banking sector.

The fragile state of the country's banks mean many are too weak to resume significant amounts of new lending.

"Most people, when pushed, acknowledge that the problems in the financial sector aren't going away, but they are not factored in," Rush said.

LOOKING ABROAD FOR FUNDING

Getting a loan is something many UK businesses say remains far too hard, despite official programmes to boost lending such as the Bank of England's Funding for Lending scheme.

One of Britain's oldest manufacturing firms, Hayward Tyler Group, which makes specialist pumps and motors the size of small cars for use in power stations around the world, grew so frustrated with its bank last year it turned instead to a strategic investor in India. It provided the funding support needed for expansion in India's booming market and beyond.

Ewan Lloyd-Baker, chief executive of Hayward Tyler, said it was encouraging that manufacturing and exports were back on the political agenda, and an export credit guarantee scheme was starting to reach small companies. But the official programmes move too slowly to get lending flowing again.

"In our experience, you're lucky if it's months, and it's more likely to be years," he said.

Rather than attempt a U-turn and agree to a big increase in public spending, Prime Minister David Cameron and his chancellor George Osborne are sticking to the austerity plan.

Osborne is expected to offer only small growth measures in his next budget due on March 20 and resist calls to borrow more to fund new infrastructure. Business leaders want less spending on welfare to free up funds for projects such as house-building and road repairs which could give a quick boost to growth.

The hope for Cameron and Osborne is that voters in 2015 will continue to pin at least some blame for the weak economy on the opposition Labour party. It left the country with a record peacetime budget deficit when it lost the elections in 2010.

With little additional spending expected from the government, the Bank of England is bearing the weight of expectations that it can do more to prop up the recovery.

The 375 billion pounds it has already spent on government bonds is equivalent to 22 percent of the UK's gross domestic product, nearly double the same measure of the U.S. Federal Reserve's $2.5 trillion (1.66 trillion pounds) of bond-buying to date, according to a study by the conservative Centre for Policy Studies.

The prospect of more money-printing by the BoE - and signs that the central bank will tolerate the inflationary impact of a weak pound as a price to get Britain growing again - has helped push sterling to its lowest level against the dollar since mid-2010 and a 16-month low against the euro.

ENOUGH OF WAITING

With yields on 10-year government bonds hovering around 2 percent, less than inflation, some investors have had enough.

The Templeton Strategic Bond Fund focuses on UK clients but has sold all its British government gilts after its managers decided that they looked too expensive.

"We basically think that the UK will have slow to no growth over the next couple of years while it goes through this fiscal adjustment whereas we think that emerging markets offer much better opportunities," said David Zahn, the fund's manager.

Although the fund is small with 7 million pounds under management, the shift away from gilts was reflected in other, larger ones managed by the firm which is part of U.S. investment group Franklin Templeton, Zahn said.

Other investors are taking a more aggressive stance against Britain.

After mostly betting at the start of the year that the pound would rise in value, speculative investors have reversed positions sharply with most expecting it will fall, according to data from the U.S. Commodity Futures Trading Commission.

Sterling could weaken as far as $1.40 from about $1.50 now, according to analysts at banks such as UBS and Commerzbank. Some fear a bigger fall that could push Britain's inflation higher.

It remains to be seen if weaker sterling will help bring about the long hoped-for rebalancing of the UK economy.

OECD economist Andre said Britain was simply not producing enough of what the world wants, especially developing countries hungry for the higher-end goods that represent the best hope for manufacturing in the more traditional economic powers.

Between 2005 and 2011, UK production of high-tech goods fell on average by 0.7 percent a year, contrasting with growth of 3.3 percent for the European Union as a whole, according to the European Union's statistics office.

The only other European countries to see a fall in high-tech production were Greece, Portugal and Italy.

"That really shows something about British competitiveness," said Andre.

(Additional reporting by David Milliken and Anirban Nag; Editing by Peter Graff)

Source: http://news.yahoo.com/long-haul-ahead-britains-struggling-economy-100354400--business.html

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Saturday, March 2, 2013

X-ray speed cameras clock superfast black hole

Douglas Heaven, reporter

PIA16695.jpg

(Image: NASA/JPL-Caltech)

This came close to being the ultimate speeding ticket. Two X-ray telescopes - NASA's NuSTAR and the European Space Agency's XMM-Newton - teamed up to measure definitively, for the first time, the spin rate of a supermassive black hole. The speed demon in question is at the heart of NGC 1365, a spiral galaxy 60 million light years away.

Supermassive black holes are monsters - some with masses a billion times that of the sun - that have grown by devouring stars and gas from their host galaxy or merging with other black holes when galaxies collide.

NGC 1365's black hole weighs in at a relatively puny 2 million solar masses, but it is spinning at just shy of the speed of light.

As they grow, supermassive black holes pull in more and more space debris, forming a flat accretion disc that circles their event horizon at speeds that push the cosmic speed limit. This artist's impression shows the spinning disc and a jet of energised particles that the black hole spits from its gaping maw.

That speed can now be confirmed thanks to the twin measurements. X-rays reflected from the inner edge of the spinning accretion disc can be used to judge the speed of revolution.?But interstellar gas clouds can get in the way and throw off the readings. To be sure that this wasn't happening, the high- and low-energy X-ray readings of the two telescopes were combined to get a better view.

Journal reference: Nature, DOI 10.1038/nature11938

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Source: http://feeds.newscientist.com/c/749/f/10897/s/291b970c/l/0L0Snewscientist0N0Cblogs0Cshortsharpscience0C20A130C0A30Cx0Eray0Eblack0Ehole0Bhtml0Dcmpid0FRSS0QNSNS0Q20A120EGLOBAL0Qonline0Enews/story01.htm

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