An improved version of a technique for folding tiny objects from a thin membrane uses a magnetic field to affect the shape. The membrane wraps around a droplet of fluid that distorts in response to the field.
Phys. Rev. Focus28, 12 (2011) – Published September 23, 2011
Experimentalists have mapped the quantum states (band structure) of cold atoms mimicking electrons in a crystal. The technique should allow researchers to study new aspects of electrons in crystals using the atoms as a model.
Phys. Rev. Focus28, 10 (2011) – Published September 9, 2011
Calculations suggest that a rapidly spinning oxygen nucleus can deform into a linear configuration of four small clusters in a row–the first clear evidence for such a “linear-chain” state in any nucleus.
Phys. Rev. Focus28, 8 (2011) – Published August 19, 2011
Analysis of newly retrieved navigational data for the Pioneer 10 and 11 spacecraft suggests that an anomalous acceleration in their motion is steadily decreasing, pointing to asymmetric radiation of heat as the likely cause, rather than the more exotic explanations previously proposed
Phys. Rev. Focus28, 7 (2011) – Published August 12, 2011
A rapidly expanding and collapsing microbubble in a fluid exerts forces strong enough to roll submerged particles stuck to a solid surface, which may explain how ultrasonic cleaning of jewelry and silicon wafers in a liquid removes dirt.
Phys. Rev. Focus28, 5 (2011) – Published July 29, 2011
Researchers fabricated a material that generates an electric field due to a stretched atomic structure, and they modified its properties by changing its growth conditions. Similar materials may be useful in nanotechnology.
Phys. Rev. Focus28, 4 (2011) – Published July 22, 2011
In the Aharonov-Bohm effect, proposed in 1959, quantum particles are affected in measurable ways by the classical electromagnetic potential, previously regarded as a purely mathematical construct. The electromagnetic field is too far from the particles to have any direct influence.
Phys. Rev. Focus28, 3 (2011) – Published July 18, 2011
The structures within a pile of soil or grain that allows it to bear weight depend only on the average number of neighbors for each particle, not on any details of the types of particles or even on the presence of gravity.
Phys. Rev. Focus28, 2 (2011) – Published July 8, 2011
Creating a temperature difference in an arrangement of semiconductors generates a circulating current and a magnetic field, according to simulations. The effect may account for some inefficiency in electronic devices.