Wednesday, May 20, 2009

The nuclear reactor at Chalk River, Ontario in Canada was shut down on Thursday, May 14 by the Atomic Energy of Canada Limited (AECL) due to a leak of heavy water. Government officials say that by Saturday the demand for medical isotopes will no longer be met, due to the shortage caused by the closure.

Medical isotopes are used in diagnostic procedures for cancer, heart disease and other medical conditions. When radioactive isotopes are injected into the body, radiologists can view higher radiation via medical imaging, enabling them to make a more accurate diagnosis.

Estimates suggest that the reactor will be shut down for approximately one month for repairs. The Chalk River Laboratories produce 33% of the international supply of medical isotopes.

Lisa Raitt, Natural Resources Minister said, “A secure supply of medical isotopes is not only an issue for Canada, it is an international issue that is being addressed co-operatively by all isotope-producing countries.”

“It may mean that if you have an elective study booked … that patient is going to be deferred and will have to wait until the situation is resolved. I’m reasonably confident that for most patients, if they’re having an acute problem, that problem is going to be dealt with – and the greater the acuity, the more likelihood it’s going to be dealt with quickly and expeditiously,” said Dr. Karen Gulenchyn, a nuclear medicine expert.

“The government of Canada is engaging international isotope producers as well as companies such as MDS Nordion, Lantheus, and Covidien, who all play key roles in securing medical isotope supply for North America,” said Raitt and Health Minister Leona Aglukkaq.

In December 2007, the 52-year-old reactor was shut down and the Canadian House of Common stepped in to restart the reactor.

Sunday, June 23, 2013

A device known as the Mosquito, set to be trialed in New South Wales (NSW), Australia by RailCorp in a bid to deter vandals from areas frequently the target of graffiti, is attracting criticism. Wikinews reached out to several people about the trials.

The units work by emitting a high-pitched buzz, similar to that of a mosquito, which is generally only audible to those under the age of about 24. The aim is to repel young people who become irritated by the noise, as a prevention method against graffiti, loitering, and other crimes like theft.

The initiative was announced last month, but RailCorp has not revealed when it intends to test the technology to crack down on graffiti.

In an interview with Wikinews, President of the NSW Council for Civil Liberties Cameron Murphy this week labeled the strategy “ridiculous”. “All they’re going to do is wear headphones and these [devices] will make no difference at all.”

Thousands of units have been set up in the UK since they first became available about seven years ago, where they’re used to stop youths gathering near public areas like shops and train stations. The technology has a high usage rate in the UK, and the Council of Europe has called for a ban on grounds it violates human rights, calling it “highly offensive”.

A RailCorp spokesperson confirmed to Wikinews the devices would only be situated on railway land away from public areas.

Mr Murphy maintains the NSW government’s policy is “based upon discrimination” and it assumes the youth affected by the noise are those doing graffiti, without solid evidence to prove this.

NSW Liberal MP Gareth Ward told Wikinews, “very few crime fighting techniques are fool-proof,” and as people have found ways to get around CCTV, they’re like to do the same with this, which is why it’s only being trialed at this stage. He acknowledged the devices will be situated in areas where the general public shouldn’t be hanging around. “There are certain areas in the network where trains may not be travelling at a particular time and that’s when those devices will be turned on […] and I think that’s perfectly reasonable.” He remarked, “any young person who feels they’ve been aggrieved […] should feel free to contact the Minster for Transport.”

A mobile phone message tone based on the same mosquito sound has been touted as teacher-proof because teens should be the only ones able to hear it if it goes off during class.

Saturday, October 14, 2006

An American inventor has patented a pair of new time formats with a footprint less than 50% of that of conventional four-digit time. The more unusual of the two new formats, called “TWELV”, dispenses with numerals altogether. In place of clock hands or digits, the new clock uses color to convey the hour and a moon image to convey the minute, which moon slowly grows throughout the course of an hour from a narrow crescent to a full-fledged circle.

The second and more approachable of the new formats retains numerical digits to indicate the minute but uses colors to convey the hour.

Early critics question whether the aesthetic benefits of the moon-clock will be sufficient to encourage users to learn the color-based time-telling system. However, the size advantages of the new system may make it particularly suitable for mobile applications, particularly cell phones, wearable computers, and head-mounted displays.

Thursday, June 23, 2011

NASA’s Cassini–Huygens spacecraft has discovered evidence for a large-scale saltwater reservoir beneath the icy crust of Saturn’s moon Enceladus. The data came from the spacecraft’s direct analysis of salt-rich ice grains close to the jets ejected from the moon. The study has been published in this week’s edition of the journal Nature.

Data from Cassini’s cosmic dust analyzer show the grains expelled from fissures, known as tiger stripes, are relatively small and usually low in salt far away from the moon. Closer to the moon’s surface, Cassini found that relatively large grains rich with sodium and potassium dominate the plumes. The salt-rich particles have an “ocean-like” composition and indicate that most, if not all, of the expelled ice and water vapor comes from the evaporation of liquid salt-water. When water freezes, the salt is squeezed out, leaving pure water ice behind.

Cassini’s ultraviolet imaging spectrograph also recently obtained complementary results that support the presence of a subsurface ocean. A team of Cassini researchers led by Candice Hansen of the Planetary Science Institute in Tucson, Arizona, measured gas shooting out of distinct jets originating in the moon’s south polar region at five to eight times the speed of sound, several times faster than previously measured. These observations of distinct jets, from a 2010 flyby, are consistent with results showing a difference in composition of ice grains close to the moon’s surface and those that made it out to the E ring, the outermost ring that gets its material primarily from Enceladean jets. If the plumes emanated from ice, they should have very little salt in them.

“There currently is no plausible way to produce a steady outflow of salt-rich grains from solid ice across all the tiger stripes other than salt water under Enceladus’s icy surface,” said Frank Postberg, a Cassini team scientist at the University of Heidelberg in Germany.

The data suggests a layer of water between the moon’s rocky core and its icy mantle, possibly as deep as about 50 miles (80 kilometers) beneath the surface. As this water washes against the rocks, it dissolves salt compounds and rises through fractures in the overlying ice to form reserves nearer the surface. If the outermost layer cracks open, the decrease in pressure from these reserves to space causes a plume to shoot out. Roughly 400 pounds (200 kilograms) of water vapor is lost every second in the plumes, with smaller amounts being lost as ice grains. The team calculates the water reserves must have large evaporating surfaces, or they would freeze easily and stop the plumes.

“We imagine that between the ice and the ice core there is an ocean of depth and this is somehow connected to the surface reservoir,” added Postberg.

The Cassini mission discovered Enceladus’ water-vapor and ice jets in 2005. In 2009, scientists working with the cosmic dust analyzer examined some sodium salts found in ice grains of Saturn’s E ring but the link to subsurface salt water was not definitive. The new paper analyzes three Enceladus flybys in 2008 and 2009 with the same instrument, focusing on the composition of freshly ejected plume grains. In 2008, Cassini discovered a high “density of volatile gases, water vapor, carbon dioxide and carbon monoxide, as well as organic materials, some 20 times denser than expected” in geysers erupting from the moon. The icy particles hit the detector target at speeds between 15,000 and 39,000 MPH (23,000 and 63,000 KPH), vaporizing instantly. Electrical fields inside the cosmic dust analyzer separated the various constituents of the impact cloud.

“Enceladus has got warmth, water and organic chemicals, some of the essential building blocks needed for life,” said Dennis Matson in 2008, Cassini project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California.

“This finding is a crucial new piece of evidence showing that environmental conditions favorable to the emergence of life can be sustained on icy bodies orbiting gas giant planets,” said Nicolas Altobelli, the European Space Agency’s project scientist for Cassini.

“If there is water in such an unexpected place, it leaves possibility for the rest of the universe,” said Postberg.

Friday, January 22, 2010

A six-year-old boy from the county of Berkshire in England, United Kingdom, who fell through a frozen pond on January 5, has died. The pond is near to the location of his house where he was playing with one of his friends. Thomas Hudson — or Tommy as he was also known — was trapped underneath the garden pond in Crookham Common, which was six feet in depth, for 30 minutes. It is not clear what exactly caused Thomas to fall into the pond.

After calls for help from Tommy’s playmate, a woman went into the water and searched for Thomas. It is believed that the woman was related to Tommy. A fire crew managed to take Thomas out of the water. After ambulance workers found themselves unable to restart his heart, Tommy was taken by aircraft to John Radcliffe Hospital in Oxford, Oxfordshire. There, an emergency operation was carried out on him before Thomas was placed on a life support machine. He died on January 21 after he failed to regain consciousness.

It has been reported that Thames Valley Police are launching an investigation into the death. However, the police has said that there are no suspicious circumstances as far as they are concerned.

Hugh Whitaker was one of the people assisting in the search for Thomas on January 5. “We worked as a team with the fire service to locate the boy in the water and he was pulled out,” Whitaker stated. “It was thought he had been in there for around half an hour. Once he was located he was taken to the air ambulance and on to the John Radcliffe Hospital after being treated by a doctor. He was in cardiac arrest at the scene. A woman who went into the water was examined by paramedics at the scene but she did not require hospital treatment. The lake was between 15 and 20 metres by 15 and 20 metres in size. From where he was recovered from he would have had to have walked out onto the water — he was not far from the centre of the frozen lake.”

A statement released from the Oxford Radcliffe Hospitals NHS Trust that said: “We are very sorry to confirm that Tommy Hudson died peacefully at our hospital this [Thursday] morning. Tommy’s parents ask that their privacy be respected at this very difficult time.”

Wednesday, January 10, 2007

Apple Inc. today has introduced the much-anticipated iPhone at the Macworld Conference in San Francisco.

The iPhone is claimed to be “a revolutionary mobile phone” as stated on the Apple website. The device appears to be running a mobile version of the Apple operating system Mac OSX. It is approximately the same size as a 5th generation iPod, it has a 3.5-inch LCD touchscreen display that is used to access all features of the phone including number dial, as well as making phone calls. The iPhone plays music, movies, displays pictures and is able to connect to a wireless network.

Apple CEO Steve Jobs unveiled the device by walking onto the stage and taking the iPhone out of his jeans pocket. During his 2 hour speech he stated that “Today Apple is going to reinvent the phone, We are going to make history today”.

Today Apple also released their Media Center device – Apple TV. It will directly compete with Microsoft’s Media Center operating system. Apple has taken a different approach to the media center market; rather than storing content (such as movies, music and photos) on the device, Apple TV connects to a computer (Mac and Windows) over a wirless network connection and plays all content stored on that computer. This makes it substantially easier for users to organize their media content.