Tibetan 'jailed' for riot reports

2 July 2011 Last updated at 15:19 GMT Riots in 2008 prompted articles in banned magazine Eastern Snow Mountain A Tibetan writer, Tashi Rabten, is reported to have been sentenced to four years in jail in south-west China.

The International Campaign for Tibet, a US-based campaign group, says he was convicted of editing a banned magazine.

Eastern Snow Mountain grew out of literary responses to the anti-China disturbances in 2008, the anniversary of a failed uprising against Beijing.

China blamed the unrest on followers of the Dalai Lama, who it said were seeking to separate Tibet from China.

The case against Tashi Rabten was reportedly heard at Aba Intermediate People's Court in Sichuan province, where the population is mainly ethnic Tibetan, according to a statement from the International Campaign for Tibet.

Aba is known as Ngaba by Tibetans. It has become a focus of confrontation between protesting Tibetans and Chinese security forces.

Three other Tibetans, who worked for the banned journal, were jailed last year on charges of inciting separatism - an accusation that the ruling Communist Party typically levels at Tibetans campaigning for self-determination for their homeland.

Continue reading the main story China says Tibet was always part of its territory Tibet enjoyed long periods of autonomy before 20th CenturyIn 1950, China launched a military assault Opposition to Chinese rule led to a bloody uprising in 1959 Tibet spiritual leader, the Dalai Lama, fled to India Dalai Lama now advocates a "middle way" with Beijing, seeking autonomy but not independence The 2008 unrest was the worst in the mountainous region in 20 years - China responded with a massive military crackdown and closed the region to foreigners.

Beijing said at least 18 people, mostly Han Chinese, were killed, but Tibetan rights groups put the figure at about 40.

Many Tibetans say Beijing is attempting to dilute their minority culture, by encouraging huge numbers of majority Han Chinese to resettle there.

Beijing says it is bringing development and improving the standard of living in the area.

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Tibetan bowls sing for physicists

1 July 2011 Last updated at 08:41 GMT By Jason Palmer Science and technology reporter, BBC News High-speed video of the bowls bears out how water begins its dazzling dance

Ceremonial Tibetan "singing bowls" are beginning to give up their secrets.

The water-filled bowls, when rubbed with a leather-wrapped mallet, exhibit a lively dance of water droplets as they emit a haunting sound.

Now slow-motion video has unveiled just what occurs in the bowls; droplets can actually bounce on the water's surface.

A report in the journal Nonlinearity mathematically analyses the effect and could shed light on other fluid processes, such as fuel injection.

At the heart of the phenomenon are what are known as Faraday waves, which arise when a fluid such as water vibrates, constrained by a closed boundary such as the edge of a singing bowl.

As the frequency of the rubbing reaches that at which the bowl naturally vibrates, the bowl's edge begins rhythmically to change shape, from one slightly oval shape into another.

The energy of this shape-shifting partly transfers to the water, in which a range of interesting patterns can arise as the intensity of the rubbing increases.

Prince Charles heard Tibetan singing bowls as part of the Longplayer composition

But at a certain point the water becomes unstable - and a fizzing display of droplets and chaotic waves results.

Slow-motion video of that transition now demonstrates how the irregular patterns of waves build up, the way that they crash into one another, and how that frees droplets that fly into the air.

What is more, under certain conditions, droplets can actually bounce repeatedly and skip on the surface of the water.

This "Faraday instability" behaviour and the bouncing drops are familiar from scientific contexts; in 2009, John Bush from the Massachusetts Institute of Technology used a range of fluids to demonstrate the effect in videos on a Discovery Channel programme called Time Warp.

"A woman named Rosie Warburton saw these and sent me an email saying that she had seen the same behaviour in her Tibetan singing bowls," Professor Bush told BBC News. "It was this email that inspired the study."

However, the bowls exhibited Faraday wave behaviour that Professor Bush called "odd by any standards, even to specialists in fluid dynamics such as ourselves".

Professor Bush and his co-author Denis Terwagne from the University of Liege in Belgium have now developed a mathematical model for how the water behaves in the bowls.

Studies of this sort are potentially of broader interest for applications in which the development of tiny fluid droplets is a concern, such as fuel injectors or perfume atomisers - or they may simply be a matter of irresistible intrigue.

"Deducing robust criteria for droplet break-up is important in a number of engineering applications," Professor Bush said. "This study was, however, purely curiosity-driven."

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