In the 1990s, we dubbed the Internet the `information superhighway`. So why is it still so hard to find what we are looking for online? According to Prof. Wendy Hall of the University of Southampton, it is because the web is mostly linkless. What`s more, if we want the Web to be useful in our daily lives, web links will have to become much more personal.
Prof. Hall is head of Southampton`s Intelligence, Agents, Multimedia (IAM) Research Group. She says that hand-crafted websites generally contain few links because they are too difficult to maintain. `It is hard enough to maintain the content, let alone the links.`
Web links are also notoriously frustrating. Computers let us click on objects and text, but only to follow information paths that have already been chosen. Using current systems, users are destined to remain forever lost in cyberspace, because designers cannot anticipate each of the thousands of different ways that people might want to use - and develop - the information contained within their pages.
Dr Lloyd Anderson | alphagalileo
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If you've ever tried to put several really strong, small cube magnets right next to each other on a magnetic board, you'll know that you just can't do it. What happens is that the magnets always arrange themselves in a column sticking out vertically from the magnetic board. Moreover, it's almost impossible to join several rows of these magnets together to form a flat surface. That's because magnets are dipolar. Equal poles repel each other, with the north pole of one magnet always attaching itself to the south pole of another and vice versa. This explains why they form a column with all the magnets aligned the same way.
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In two experiments performed at the free-electron laser FLASH in Hamburg a cooperation led by physicists from the Heidelberg Max Planck Institute for Nuclear physics (MPIK) demonstrated strongly-driven nonlinear interaction of ultrashort extreme-ultraviolet (XUV) laser pulses with atoms and ions. The powerful excitation of an electron pair in helium was found to compete with the ultrafast decay, which temporarily may even lead to population inversion. Resonant transitions in doubly charged neon ions were shifted in energy, and observed by XUV-XUV pump-probe transient absorption spectroscopy.
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An international research group has observed new quantum properties on an artificial giant atom and has now published its results in the high-ranking journal Nature Physics. The quantum system under investigation apparently has a memory - a new finding that could be used to build a quantum computer.
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