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Quantum computing spins closer




The promise of quantum computing is that it will dramatically outshine traditional computers in tackling certain key problems: searching large databases, factoring large numbers, creating uncrackable codes and simulating the atomic structure of materials. (2008-11-24)


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Electron strobe turns atoms into movie stars - New Scientist (subscription)

Electron strobe turns atoms into movie stars
New Scientist (subscription), UK - Nov 21, 2008
For years, transmission electron microscopes (TEMs) have been able to resolve individual atoms, and even objects just a fraction of a nanometre across. ...
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Modeling of Lanthanum Strontium Manganite Ferromagnetic Thin Film Material Tunable Resistance
The knowledge of the electroactive and magnetoactive properties of the lanthanum strontium manganite (LSMO) ferromagnetic thin film materials is essential for modeling and design of their devices. The activity of these materials can be described by their electro- and magnetoresistances. Under electrostatic bias field, it is assumed that induced electric current will modify the electrical behavior of the electrode–manganite interface, resulting in the decrease of film resistance. This letter takes a close look at modeling the change of LSMO resistance with working frequency and applied bias.
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Back to mediocrity

The Olympics are over, and everyone is tired, including me. But what a show, and so colorful! Those Chinese sure like red stuff. I've been drawing athletes in action for the last two weeks trying to capture in my imagination the grace and power and agility I saw on the screen. This Weblog is old enough that longtime readers can recall my effusions about the 2004 Olympics, from the August 2004 archive. I felt much more hopeful then than now that I would ever learn anything mathematical and physics-oriented. Currently I am so busy with other work (at the day job, mostly) that I barely get to contemplate a calculus limit, let alone solve limit problems.

I still am a sucker for excellence. I value excellence, or competence, or achievement, more than anything else in the world. I honor it wherever I see it. I watched the TV and Internet coverage knowing that I was being shamelessly manipulated emotionally and mentally, but I didn't care. I was seeing excellence, or at least striving for excellence, even if the girl fell off the beam or the fencer got struck down or the runner lost at the last few meters. At least they tried.

Later in 2004, I forgot all about the Olympics when the Boston Red Sox won their first World Series in 86 years. I thought that was excellent, too. What about art excellence? I constantly visit the sites of commercial artists who work for games and movies and illustrations. There's a lot of this art and I find it thrilling. It's colorful, too, like the Chinese Olympics with their costumes and fireworks. I am a spectator, not a participant. I'm a consumer, not a producer. By the time I get around to having the opportunity to do something myself, it is already 4 in the morning and I should not be up at this hour at all.

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Laser-Induced Line Patterning of Nonlinear Optical Crystals in Glass
This paper reports the progress in the patterning of nonlinear optical crystal lines on a glass surface by laser irradiation techniques. Two techniques for the patterning of crystal lines have been developed, i.e., rare-earth atom heat processing and transition metal atom heat processing, in which continuous-wave lasers such as Nd:YAG laser (wavelength: lambda = 1064 nm) are irradiated onto the glasses containing rare-earth ions such as Sm3+ and Dy3+ or transition metal ions such as Ni2+ and Cu2+. The patterning of lines consisting of nonlinear optical crystals such as beta-BaB2O4, SmxBi1- xBO3, (Sr,Ba)Nb2O6, and LiNbO3 has been achieved. It is clarified from the azimuthal dependence of second harmonic intensities and polarized micro-Raman scattering spectra that nonlinear optical crystals in the lines are highly oriented along the laser scanning direction, i.e., the patterning of single-like crystal lines. It is also possible to pattern two-dimensional crystal bending or curved lines by just changing the laser scanning direction, and such bending crystal lines have a potential for optical waveguides.
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High-resolution electron microscopy of multi-wall carbon nanotubes in the subcutaneous tissue of rats

The atomic structure of multi-wall carbon nanotubes (MWCNTs) implanted in the subcutaneous tissue of rats was examined by means of high-resolution transmission electron microscopy (HRTEM). Clusters of the MWCNTs implanted in the subcutaneous tissue were well recognized by the TEM observations. It was indicated that some nanotubes were taken in phagocytes after the 1-year implantation. The deterioration of crystalline structure of the nanotubes in phagocytes was shown by the HRTEM observation. It was suggested that the deterioration of the nanotubes was due to the peeling of the outer graphene layers in the phagocytes.

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