Showing posts with label science. Show all posts
Showing posts with label science. Show all posts

November 28, 2016

Gottfried Wilhelm Leibniz: The Philosopher Who Helped Create the Information Age


                                                      



When did the information age begin? 

One might point to the winter of 1943, when British engineers started using a room-sized machine dubbed “Colossus,” the world’s first electronic digital programmable computer, to break Nazi codes during the World War II.

Or perhaps it was February 1946, when the U.S. Army unveiled the faster, more flexible Electronic Numerical Integrator and Computer (aka ENIAC) at the University of Pennsylvania. History buffs may push it back further, perhaps bringing up key 19th-century figures like Charles Babbage and Ada Lovelace who pioneered programmable calculating machines in Victorian England.

But we should look back even earlier, to the work of a towering but often overlooked intellect—to Gottfried Wilhelm Leibniz, the German philosopher and polymath who died 300 years ago on Nov. 14, 1716. Though you may not have heard of him, he was a man who envisioned the systems and machines that would define the digital revolution.

Something of a prodigy, Leibniz was just 8 when he started reading the books in his father’s library. (His father was a professor of moral philosophy at Leipzig University.) He quickly learned the classics, once boasting that he could recite Virgil’s Aeneid by heart. 

At school, he excelled in logic; by 17 he had defended his master’s thesis, and three years later he had qualified for his doctorate. Leibniz would go on to work as a historian, librarian, legal adviser, and diplomat. He wrote on biology, medicine, geology, theology, psychology, linguistics, and of course philosophy. The king of Prussia, Frederick the Great, described Leibniz as “a whole academy in himself.”

Famously, Leibniz clashed with Isaac Newton over the invention of calculus. Historians now believe that the two men discovered calculus independently, though it’s Leibniz’s elegant and compact notation system, not Newton’s clunkier version, that we use today.

Of course, there was no such thing as “computer science” in Leibniz’s day. But by developing the binary number system, a way of representing numerical information using zeroes and 1s, he became the father of all computer coding. (Computers don’t have to run by manipulating zeroes and 1s—but it’s a lot easier if they do.) 

Leibniz believed that machines, not people, should be crunching numbers and worked on a prototype for a device that could add, subtract, multiply, and divide. He tweaked and improved the design over many years; one of these contraptions looked like a primitive pinball game, with numbers represented by tiny spheres, rolling along grooves and going through gates that open and close. In London, his fellow scientists were so impressed with the device that they elected him to the Royal Society. He designed another machine that could do certain kinds of algebra, and yet another for cracking codes and ciphers.

Leibniz envisioned these machines would be used in accounting, administration, surveying, astronomy, the production of mathematical tables, and more. 

Tedious work that had kept human beings awake far into the night, working by candlelight, could now be mechanized.


Unfortunately, the technology of the day didn’t allow for the precisely machined parts, such as uniform screws, that Leibniz’s devices required. (For instance, as historians later discovered, something as simple as “carrying the one” turns out to be maddeningly difficult to implement in hardware.) Despite 45 years of work and many prototypes, his calculating machine was never fully functional.

But for Leibniz, computation was just the beginning: He believed that all kinds of problems could be reduced to the manipulation of symbols and tackled just as though they were mathematical problems. He imagined a kind of alphabet of human thought, whose symbols could be manipulated according to precise, mechanical rules, the work carried out by devices. He called them “reasoning machines” and envisioned the pursuit we know today as artificial intelligence.

Once the system was perfected, he believed, humanity would have “a new kind of tool, a tool that will increase the power of the mind much more than optical lenses helped our eyes, a tool that will be as far superior to microscopes or telescopes as reason is to vision.” We would weigh arguments, he said, “just as if we had a special kind of balance.” Linguistic barriers between nations would fall, and the new universal language would usher in an era of understanding, peace, and prosperity. (Leibniz was, needless to say, an optimist—he also had ambitions to reunify the Catholic and Protestant churches.)

Leibniz, however, was right in foreseeing the extent to which we would come to see our world in terms of numbers. (Even just a century ago, who would have imagined that creating and manipulating visual images, or recording a symphony, would boil down to processing certain arrangements of zeroes and 1s?) He even worried about “data overload,” as individuals and governments struggled to process, store, and retrieve the vast amounts of data that would soon be generated.

Leibniz never became a household name, and many of his ideas, like the notion of a universal symbolic language, never bore fruit. 

Much of it had to be re-discovered by later thinkers, such as the 19th-century English mathematician and philosopher George Boole, who more fully developed the idea of a logical system based on binary arithmetic. 

(You may have run across his name before: Boolean algebra, Boolean searches, Boolean system.) But, in imagining a world in which machines could be used to supplement or supplant human computation, Leibniz’s way of thinking paved the way for the information age that blossomed 250 years after his death.


By Dan Falk

With many thanks to Slate


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November 04, 2016

Scientists Have Detected A Crack In Earth's Magnetic Shield


                                                                          

Earth is such a habitable place, thanks in no small part to the vast magnetic field that surrounds our planet, shielding us from harsh solar winds and cosmic radiation.
But scientists have been investigating one of the most powerful geomagnetic storms in recent history, and they’ve discovered that our protective barrier isn’t as secure as we thought it was. Turns out, our magnetosphere has been cracked.

Researchers have been analysing data from the GRAPES-3 muon telescope in Ooty, India, which recorded a massive burst of galactic cosmic rays on 22 June 2015. 

For 2 hours, Earth’s magnetosphere was being bombarded by these particles, which emit immensely high-energy radiation, and travel through space at nearly the speed of light. 
These things are so powerful, they can easily penetrate the hull of a spacecraft, and Earth’s magnetic shield is our first line of defence against them. 

About 40 hours before the June 22 event, a giant cloud of plasma was ejected from the Sun's corona (or outer atmosphere), and eventually struck the magnetosphere at speeds of about 2.5 million kilometres per hour.

That’s not exactly news, because at the time, it triggered a severe geomagnetic storm that was responsible for radio signal blackouts in many high latitude countries in North and South America.

It also resulted in a supercharged aurora borealis - which is created when charged particles from outer space reach Earth’s atmosphere.

                                                               

But now researchers have finally realised the full extent of that relentless bombardment of cosmic rays. 

A team from the Tata Institute of Fundamental Research in India performed numerous simulations based on the GRAPES-3 data from that day, and the results indicate that the magnetosphere had been temporarily cracked, and that’s why things went so haywire in our radio systems.

In fact, the team says the bombardment was so relentless, it caused a severe compression of the magnetosphere, forcing it to shrink from 11 to 4 times the radius of Earth.
The researchers suspect that the geomagnetic storm was powerful enough to actually 'reconfigure' our magnetic shield, prising open weak spots to let radiation and cosmic rays slip through.

"This vulnerability can occur when magnetised plasma from the Sun deforms Earth’s magnetic field, stretching its shape at the poles and diminishing its ability to deflect charged particles," Katherine Wright explains on the American Physical Society website.
The fact that this happened at all is a concern, say the researchers, because it suggests that our magnetic field is changing - or rather, weakening - in certain parts.

"The occurrence of this burst also implies a 2-hour weakening of Earth’s protective magnetic shield during this event," the researchers report.

"[This] indicates a transient weakening of Earth’s magnetic shield, and may hold clues for a better understanding of future superstorms that could cripple modern technological infrastructure on Earth, and endanger the lives of the astronauts in space."

So the good news is our magnetosphere was only temporarily cracked, but the bad news is that it can be cracked at all.

There's not a whole lot we can do about that, but the researchers hope that by continuing to search for these cracks as they happen - and in past events - we'll be better prepared to deal with the next time those cosmic rays burst through and wreak havoc.

By Bec Crew

With many thanks to Science Alert

October 14, 2016

Scientists Just Broke A Fusion World Record - It Could Mean Limitless Clean Energy


                                                                 


Scientists have set a new world record for plasma pressure - the 'key ingredient' for producing energy from nuclear fusion - which means this clean and sustainable energy source is closer to our grasp than ever before.
The new record stands at 2.05 atmospheres - a 15 percent jump over the previous record of 1.77 atmospheres. Both this record and the last were set at the custom-built Alcator C-Mod reactor at MIT.

While a viable nuclear fusion reactor ready to power our homes is still a long way off, these increased pressures equate to increased reaction rates, and are more evidence that we're getting closer to a reactor that's technologically and economically viable.
It also gives scientists more clues about how best to move forward.

"This is a remarkable achievement that highlights the highly successful Alcator C-Mod program at MIT," said physicist Dale Meade of Princeton Plasma Physics Laboratory, who wasn't involved in the experiments.

"The record plasma pressure validates the high-magnetic-field approach as an attractive path to practical fusion energy."

To reach the 2.05-atmosphere record, MIT researchers turned the reactor up to 35 million degrees Celsius (63 million degrees Fahrenheit) - over twice as hot as the Sun's core - holding plasma producing 300 trillion fusion reactions per second for 2 seconds.

These three variables - temperature, pressure, and time sustained - act as trade-offs, as previous records from teams from around the world have demonstrated. For example, while the Alcator C-Mod reactor has the top spot in terms of pressure, other reactions have been hotter or lasted longer.

However, plasma pressure is crucial to the overall energy produced, which is why the MIT team is so excited. It says pressure levels are "two-thirds of the challenge" of producing nuclear fusion reactions.

Scientists think nuclear fusion could give us the clean, safe, and virtually unlimited energy source we've been looking for - it essentially replicates what's happening on the Sun here on Earth, by heating tiny elements of matter to over several million degrees Celsius, and forming the superheated gas called plasma.

Isolate plasma from ordinary matter using a super-strong magnetic field, and there's your energy source - one that could replace all nuclear and fossil fuel power plants at a stroke.
And unlike the nuclear fission reactions that power today's nuclear power plants (where atoms are split), nuclear fusion (where atoms are fused together) creates no radioactive waste, and there's no chance of a meltdown either.

By David Nield

With many thanks to Science Alert

                                                                 

October 02, 2016

The Nobel Prizes In Numbers


                                                             


                                                                  
Five prizes were created by Alfred Nobel in his 1895 will, for medicine, physics, chemistry, literature and peace, which were awarded from 1901. A sixth prize in economics, “in memory of Alfred Nobel,” was created by Sweden’s central bank in 1968.

Six laureates have declined the prize. The only two to do so of their own will were France’s Jean-Paul Sartre, who turned down the 1964 literature prize, and Vietnam’s then-prime minister Le Duc Tho, who refused to share the 1973 Nobel Peace Prize with US Secretary of State Henry Kissinger. 

Adolf Hitler forbade three German laureates -- Richard Kuhn (chemistry 1938), Adolf Butenandt (chemistry 1939) and Gerhard Domagk (medicine 1939) -- from accepting the prize, while Soviet authorities forced Boris Pasternak to decline the 1958 literature prize.

Eight laureates were born on February 28 and May 21, the two most popular birthdates for laureates. Other dates have produced no laureates, including January 2 and October 13.

Twelve is the number of times the medicine prize jury considered the nomination of Sigmund Freud, the father of psychoanalysis, rejecting it each time.

His work had no scientific value, an expert concluded in 1929. 

The nomination of Mahatma Gandhi, who also famously never won a Nobel, was considered four times, excluding the year of his assassination in 1948.

The youngest laureate to be honoured was 17 years old — Malala Yousafzai of Pakistan (peace 2014). The oldest laureate was Russian-born American Leonid Hurwicz (economics 2007), who was 90.

Eighteen laureates have been affiliated with the two universities claiming the most Nobels: Stanford and the University of California, Berkeley.

Myanmar’s Aung San Suu Kyi had to wait 20 years before she could travel to Oslo to collect the peace prize she was awarded in 1991.

 Also deprived of their liberty: German pacifist Carl von Ossietzky (peace 1935), who died in 1938 without being allowed to leave his country; and Chinese dissident Liu Xiaobo (peace 2010), is still behind bars.

Twenty-seven English-language writers have won the literature prize, ahead of French (14), German (13) and Spanish (11) laureates.

Forty eight women have won a Nobel prize, including Marie Curie who won it twice (physics 1903 and chemistry 1911). 

The economics prize, with only one female laureate, in 2009, and the physics prize, with only two laureates in 109 years, remain the most inaccessible prizes for women.

 A total of 822 Nobel laureates are men.

The various juries have decided to not award the prize 49 times. The peace prize has had no recipient 19 times, most recently in 1972.

Fifty years must pass before the juries’ top secret deliberations are opened to the public.

The average age of the economics prize laureates is 67, the oldest average age, while the youngest average age can be found among physics laureates, at 55.

There were 376 nominations for the 2016 Nobel peace prize, a record with almost 100 more than in 2014 when the previous record was set. In 1942, 1943 and 1944, no nominations were accepted.

870 people have won a Nobel prize, including four scientists who won it twice. Twenty-six groups or organisations have been honoured with the Nobel peace prize, such as Tunisia’s National Dialogue Quartet in 2015.

1,350 people are typically invited to the Nobel gala banquet celebrating the laureates, held each year at Stockholm’s city hall on December 10, in honour of the death of Alfred Nobel. 

At the first dinner in 1901, 113 people were invited.

Each laureate is awarded 8 million Swedish kronor ($1.2m) which is shared if several laureates are honoured in the same field. 

Literature laureates are the ones most likely to take home the whole sum: on 104 occasions there has been just one literature winner.
With many thanks to The Australian 


                                                            

Source. 

                                                              

                                                                   

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