Thursday, July 8, 2010

The Solar Impulse, an experimental solar-powered airplane, landed in Switzerland on Thursday after completing a successful 26-hour test flight. The flight was a proof-of-concept displaying that a solar-powered aircraft can accumulate enough power from the sun during the day to power it through the night. The team that designed and built the aircraft believes that, in theory, the plane could fly indefinitely, given that there is enough sunlight to power it.

The flight is the longest and highest flight by a piloted solar-powered aircraft, with an average altitude of about 28,000 feet, and an average speed of around 25 miles per hour. Pilot Andre Borschberg, a former fighter pilot in the Swiss air force, said “I’ve been a pilot for forty years now, but this flight has been the most incredible of my flying career. Just sitting there and watching the battery charge level rise and rise thanks to the sun. I have just flown more than 26 hours without using a drop of fuel and without causing any pollution.”

The plane can carry only one passenger, and contains 12,000 solar cells. However, the plane does have its setbacks; a blog on the project’s website reported after seventeen hours of flight that “Andre’s feeling great up there. His only complaints involve little things like a slightly sore back as well as a ten-hour period during which it was minus twenty degrees Celsius in the cockpit. That made his drinking water system freeze up and worst of all his iPod batteries die.”

The project’s intention is to show that emissions-free air travel is a feasible concept; however, the team does not believe that current propulsion methods will be replaced by alternatives in the near future.

Wednesday, February 4, 2009

A new historic physics record has been set by scientists for exceedingly small writing, opening a new door to computing‘s future. Stanford University physicists have claimed to have written the letters “SU” at sub-atomic size.

Graduate students Christopher Moon, Laila Mattos, Brian Foster and Gabriel Zeltzer, under the direction of assistant professor of physics Hari Manoharan, have produced the world’s smallest lettering, which is approximately 1.5 nanometres tall, using a molecular projector, called Scanning Tunneling Microscope (STM) to push individual carbon monoxide molecules on a copper or silver sheet surface, based on interference of electron energy states.

A nanometre (Greek: ?????, nanos, dwarf; ?????, metr?, count) is a unit of length in the metric system, equal to one billionth of a metre (i.e., 10^-9 m or one millionth of a millimetre), and also equals ten Ångström, an internationally recognized non-SI unit of length. It is often associated with the field of nanotechnology.

“We miniaturised their size so drastically that we ended up with the smallest writing in history,” said Manoharan. “S” and “U,” the two letters in honor of their employer have been reduced so tiny in nanoimprint that if used to print out 32 volumes of an Encyclopedia, 2,000 times, the contents would easily fit on a pinhead.

In the world of downsizing, nanoscribes Manoharan and Moon have proven that information, if reduced in size smaller than an atom, can be stored in more compact form than previously thought. In computing jargon, small sizing results to greater speed and better computer data storage.

“Writing really small has a long history. We wondered: What are the limits? How far can you go? Because materials are made of atoms, it was always believed that if you continue scaling down, you’d end up at that fundamental limit. You’d hit a wall,” said Manoharan.

In writing the letters, the Stanford team utilized an electron‘s unique feature of “pinball table for electrons” — its ability to bounce between different quantum states. In the vibration-proof basement lab of Stanford’s Varian Physics Building, the physicists used a Scanning tunneling microscope in encoding the “S” and “U” within the patterns formed by the electron’s activity, called wave function, arranging carbon monoxide molecules in a very specific pattern on a copper or silver sheet surface.

“Imagine [the copper as] a very shallow pool of water into which we put some rocks [the carbon monoxide molecules]. The water waves scatter and interfere off the rocks, making well defined standing wave patterns,” Manoharan noted. If the “rocks” are placed just right, then the shapes of the waves will form any letters in the alphabet, the researchers said. They used the quantum properties of electrons, rather than photons, as their source of illumination.

According to the study, the atoms were ordered in a circular fashion, with a hole in the middle. A flow of electrons was thereafter fired at the copper support, which resulted into a ripple effect in between the existing atoms. These were pushed aside, and a holographic projection of the letters “SU” became visible in the space between them. “What we did is show that the atom is not the limit — that you can go below that,” Manoharan said.

“It’s difficult to properly express the size of their stacked S and U, but the equivalent would be 0.3 nanometres. This is sufficiently small that you could copy out the Encyclopaedia Britannica on the head of a pin not just once, but thousands of times over,” Manoharan and his nanohologram collaborator Christopher Moon explained.

The team has also shown the salient features of the holographic principle, a property of quantum gravity theories which resolves the black hole information paradox within string theory. They stacked “S” and the “U” – two layers, or pages, of information — within the hologram.

The team stressed their discovery was concentrating electrons in space, in essence, a wire, hoping such a structure could be used to wire together a super-fast quantum computer in the future. In essence, “these electron patterns can act as holograms, that pack information into subatomic spaces, which could one day lead to unlimited information storage,” the study states.

The “Conclusion” of the Stanford article goes as follows:

The team is not the first to design or print small letters, as attempts have been made since as early as 1960. In December 1959, Nobel Prize-winning physicist Richard Feynman, who delivered his now-legendary lecture entitled “There’s Plenty of Room at the Bottom,” promised new opportunities for those who “thought small.”

Feynman was an American physicist known for the path integral formulation of quantum mechanics, the theory of quantum electrodynamics and the physics of the superfluidity of supercooled liquid helium, as well as work in particle physics (he proposed the parton model).

Feynman offered two challenges at the annual meeting of the American Physical Society, held that year in Caltech, offering a $1000 prize to the first person to solve each of them. Both challenges involved nanotechnology, and the first prize was won by William McLellan, who solved the first. The first problem required someone to build a working electric motor that would fit inside a cube ¹/₆₄ inches on each side. McLellan achieved this feat by November 1960 with his 250-microgram 2000-rpm motor consisting of 13 separate parts.

In 1985, the prize for the second challenge was claimed by Stanford Tom Newman, who, working with electrical engineering professor Fabian Pease, used electron lithography. He wrote or engraved the first page of Charles Dickens’ A Tale of Two Cities, at the required scale, on the head of a pin, with a beam of electrons. The main problem he had before he could claim the prize was finding the text after he had written it; the head of the pin was a huge empty space compared with the text inscribed on it. Such small print could only be read with an electron microscope.

In 1989, however, Stanford lost its record, when Donald Eigler and Erhard Schweizer, scientists at IBM’s Almaden Research Center in San Jose were the first to position or manipulate 35 individual atoms of xenon one at a time to form the letters I, B and M using a STM. The atoms were pushed on the surface of the nickel to create letters 5nm tall.

In 1991, Japanese researchers managed to chisel 1.5 nm-tall characters onto a molybdenum disulphide crystal, using the same STM method. Hitachi, at that time, set the record for the smallest microscopic calligraphy ever designed. The Stanford effort failed to surpass the feat, but it, however, introduced a novel technique. Having equaled Hitachi’s record, the Stanford team went a step further. They used a holographic variation on the IBM technique, for instead of fixing the letters onto a support, the new method created them holographically.

In the scientific breakthrough, the Stanford team has now claimed they have written the smallest letters ever – assembled from subatomic-sized bits as small as 0.3 nanometers, or roughly one third of a billionth of a meter. The new super-mini letters created are 40 times smaller than the original effort and more than four times smaller than the IBM initials, states the paper Quantum holographic encoding in a two-dimensional electron gas, published online in the journal Nature Nanotechnology. The new sub-atomic size letters are around a third of the size of the atomic ones created by Eigler and Schweizer at IBM.

A subatomic particle is an elementary or composite particle smaller than an atom. Particle physics and nuclear physics are concerned with the study of these particles, their interactions, and non-atomic matter. Subatomic particles include the atomic constituents electrons, protons, and neutrons. Protons and neutrons are composite particles, consisting of quarks.

“Everyone can look around and see the growing amount of information we deal with on a daily basis. All that knowledge is out there. For society to move forward, we need a better way to process it, and store it more densely,” Manoharan said. “Although these projections are stable — they’ll last as long as none of the carbon dioxide molecules move — this technique is unlikely to revolutionize storage, as it’s currently a bit too challenging to determine and create the appropriate pattern of molecules to create a desired hologram,” the authors cautioned. Nevertheless, they suggest that “the practical limits of both the technique and the data density it enables merit further research.”

In 2000, it was Hari Manoharan, Christopher Lutz and Donald Eigler who first experimentally observed quantum mirage at the IBM Almaden Research Center in San Jose, California. In physics, a quantum mirage is a peculiar result in quantum chaos. Their study in a paper published in Nature, states they demonstrated that the Kondo resonance signature of a magnetic adatom located at one focus of an elliptically shaped quantum corral could be projected to, and made large at the other focus of the corral.

Friday, April 11, 2008

Wikinews held an exclusive interview with Jeremy Hanke, editor of MicroFilmmaker Magazine. The magazine, which is free to read online, was started as a resource for the low budget moviemaker and features book, independent film, equipment and software reviews as well as articles on film distribution, special effects and lighting.

He says that one of the goals of the magazine is to “connect low-budget filmmakers via a feeling of community, as many…..often compete so viciously against one another in film festivals for coveted “shots” with Hollywood, that they can quickly forget their similarities.”

When asked if films made on a shoestring budget can really compete with those made for millions of dollars, he replied, “no…yes…and absolutely. Allow me to explain.” And so he does in the interview below.

Friday, December 14, 2007

Reggie Bibbs is a 43-year-old-man living in Houston, Texas. Mr Bibbs was born with a genetic disease called neurofibromatosis (NF), which causes him to develop tumors on his body (see infobox on the right). NF can be a subtle disease, but in Bibbs’ case it has left him with a disfigured face and deformed leg. But he is happy with the way he looks, and doesn’t want to change his appearance to please other people. He has launched a successful campaign entitled “Just Ask”, and that’s just what Wikinews did in a video-interview.

The interview was prepared by Wikinews reporter Michaël Laurent with the help of Bertalan Meskó (who has a popular genetics and web 2.0 blog). Their questions were sent to a close friend of Mr. Bibbs, Lou Congelio, who kindly conducted the interview.

Thursday, February 12, 2009

An article in the February 12 issue of the New England Journal of Medicine reports on an unusual cause for an outbreak of low blood sugar among men in Singapore: illegal use of sexual performance enhancement drugs that were contaminated with a diabetes drug.

Between January and May 2008, 149 men and one woman between 19 and 97 (mean age 51) were admitted to five public hospitals for unexplained low blood sugar. Similar cases were reported in media reports from Hong Kong. Seven Singaporean patients remained in a coma because of prolonged sugar starvation of the brain, and four subsequently died. The diabetes drug glyburide was found in blood and/or urine samples in 85% of cases; 30% admitted having used illegal sexual performance enhancers.

The contaminated products were a counterfeit version of the drug Cialis (meant for the treatment of genuine erectile dysfunction), and three purported herbal preparation (the affected brands included Power 1 Walnut and Santi Bovine Penis Erecting Capsule). All four preparations additionally contained Viagra in varying concentrations. Two herbal products contained traces of the weight loss drug sibutramine, a compound related to amphetamines.

The drug packaging mentioned names of non-existent overseas production facilities, so the source of the contamination with the diabetes drug could not be established.

The authors underline the risks that is known to be associated with purchasing drugs from unreliable providers or from online resellers. The clandestine use of impotence drugs as sexual performance enhancers seems to have provided a good illustration of this problem. They further call for more efforts by national and international health and law enforcement agencies to curb the manufacturing, international transport and sales of untrustworthy medication.

Sunday, May 24, 2009

The Saskatoon Health Region in Saskatchewan, Canada recently discovered a fax machine problem which had not relayed almost 1,500 X-rays, Computed tomography (CT) and Magnetic resonance imaging (MRI) scans, ultrasounds, and other medical imaging test results to doctors.

The fax machine is part of the automated Radiology Information System. An audit revealed that medical diagnostic tests involving results dating back a decade have been affected by the broken fax machine.

On May 6, a doctor called the health region officials seeking follow up on a patient’s report. Staff who delved into it, found that the report was not sent from the system.

Now, two weeks later, this same patient has still not been contacted by the health region.

“It has taken some time to work with the patient’s physician. That was important — to get more information and more detail because we want that patient’s physician to be involved in the discussion with the patient,” Dr. David Poulin, vice-president of medical affairs for The Saskatoon Health Region, said. “This is a system error and that’s just what it was — an error. This doesn’t reflect in any way on the quality of work regional staff have done and continue to do.”

An internal review revealed that, of 2.2 million diagnostic tests performed, at least 1,380 had not been sent out by the malfunctioning fax machine.

The health region will embark on contacting each of the 1,380 patients and their physicians to make sure that the results have been received and if any health care was compromised.

Patients can also contact the health region via a newly set up hotline to make enquiries.

“We think it would actually be good practice if physician offices could have a system to check whether they have received important reports,” said Poulin, “The common practice appears to be in many doctors’ offices, particularly family physician offices, that they don’t respond to the report until it arrives. So, they basically are waiting for the report to arrive in their office by fax and it’s at that point that they look at it and decide what action to take.”

City Hospital, St. Paul’s Hospital and Royal University Hospital were the three city hospitals affected. Saskatoon has a population of roughly 233,923, and the hospitals also serve the surrounding rural areas.

Ironically the faulty fax machine was discovered the same week that provincial medical officials began to review approximately 70,000 radiology tests conducted in Yorkton. Officials there doubt the competence of the physician who first interpreted the radiology results.