All posts by Tomas Martin

Writer and particle physics student from Bristol, England. My story 'A Shogun's Welcome' featured in Aberrant Dreams #7 and 'The Shogun and The Scientist' will be published in the anthology 'The Awakening' in January 2008. I review at SFCrowsnest and wrote the fictional blog miawithoutoil for the world without oil project.
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Asteroid may hit Mars at end of January

The asteroid is part of a small group of rocks that cross both Earth and Mars orbitsIf you’ve watched Deep Impact and Armageddon a hundred times and still want to know what a real asteroid impact would look like, mark January 30th 2008 on your calenders. On that date, the path of Asteroid 2007 WD5 passes perilously close to our neighbour Mars and may or may not hit it.

The NEO (near-earth object) was found in November and marked because it also passes close to Earth. Analysis of its path say there’s a 1 in 75 chance the 50m rock will impact on the red planet, causing a crater up to half a mile wide.

[via Chris Mckitterick, image by NASA]

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Striking writers look to open new internet ventures

Whilst I’ve talked in the past about the future of online content, it appears for some writers an internet based career is rapidy becoming present, not future. The LA Times reports that a number of the writers and creators involved in the Hollywood writer strike are in talks with venture capitalists and advertisers about creating their own content sites. It may be that if this strike continues long enough, some writers may not come back at all to the studios. It’s also interesting to note that the words quoted most by the writers invovled is ‘United Artists’, the organisation that structured good deals for creators way back in Hollywood history.

On the web, there’s also a good round table discussion featuring Tobias Buckell, Pyr editor Lou Anders and David Louis Edelman at SF Signal about the use of the internet to promote writers via community, rather than advertising. Charles Stross also had a good rant about the idiocy of the Kindle earlier in the month.

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Stanford creates nanowire batteries with 10 times current charge

Nanowires are an exciting way to dramatically increase efficiency in exisiting silicon tech

Lithium-ion batteries, such as those used in your laptop, mobile phone or hybrid car, are extremely important in today’s world but are limited by the amount of lithium ions that the typically carbon anode can hold. Stanford announced this week they’ve developed a new method that can increase the amount of charge held by as much as 10 times.

 The new battery uses what is perhaps the technology of the next ten years – nanowires.  At large scale, the swelling of the lithium ions when they absorb positive charge breaks the structure of the silicon holding them. The researches instead used a mesh of microscopic silicon nanowires that bend and swell under the pressure but do not break. The researcher, Yi Cui, said:

Manufacturing the nanowire batteries would require “one or two different steps, but the process can certainly be scaled up,” he added. “It’s a well understood process.”

 I’ll look forward to my laptop with 25 hour battery life in a few years, then.

[via Daily Kos, image from the Stanford article, apologies for my absence this week – I’ve been wrestling with my wireless connection on Ubuntu Gutsy]

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With Knol, Google enters the knowledge market

The top part of an example knol

Google has announced a new wikipedia-like project, entitled ‘knol’. Short for knowledge, the project aims to have an encyclopedia type experience but with more emphasis on the author, rather than anonymous multiple contributors. There will not be editorial contributions from Google, but authors including ads will get revenue.

An example knol has been put up on the Google blog. Google says that the emphasis will be on large numbers of posts, ranked by users and views to encourage quality. Peer review seems to encourage good writers to become better rated and more successful. Added to the potential to earn money, this endeavour could provide a good potential way to create a freelance online writer business model. It looks like Knol will be less comprehensive/consistent across the entire volume of data than Wikipedia, but with better quality at the top end. It’s a similar model to Mahalo, only with the backing of perhaps the biggest internet company out there.

[via boing boing, image is the example of a Google Knol]

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More on reionisation

The universe has been expanding for 13 billion years

On Wednesday I talked about reionisation and how many of the new telescopes being designed are to study this side of astronomy. But what exactly does this mean? Well, ionisation just means that the electrons of an atom are separated from the protons and neutrons. This usually requires a lot of energy, especially if it occurs over a large area. When the universe began after the big bang (the far left of the picture), everything was close together and extremely hot. For a while even the quarks that make up protons and neutrons were independent of each other. Over time the universe grew and the temperature decreased. Quarks recombined into particles, electrons recombined with protons, leaving us with mostly neutral hydrogen, all across the universe.

Now, astronomers can’t see much from neutral hydrogen. It’s too cool to emit much EM-radiation as light, infra red or radio waves that telescopes can pick up. Today, however, we see lots of radiation – from stars, galaxies, black holes, quasars and ionised gas. If the universe was neutral 12 billion years ago, what caused it to reionise? Probably, the first stars caused this change. Over huge periods of time tiny variations in the density of the universe caused the hydrogen to collapse into stars, whose light then ionised the regions around them. By studying the ‘bubbles’ of ionisation so long ago we can work out why the universe has the structure we see today.

Astronomers have never seen that far back before in the key Radio and Infrared regions. The telescopes of the last fifty years just don’t have the power, as Scotty might say. The further back through time you want to look, the further the light has to travel and the fainter the signal. With the advances in computer technology over the last twenty years, we can finally start building equipment capable of seeing those first stars and galaxies. If people are interested, I’ll post the occasional update on how telescopes like JWST and SKA are progressing.

[photo by Nasa’s WMAP team via JSWT Science Case]