Computers

  2010 JUL 15 - (VerticalNews.com) -- According to a study from Hong Kong, People's Republic of China, "In this work, we introduce two models of Feynman's ratchet and pawl system. Molecular dynamics is carried out to simulate the two designs for Feynman's ratchet and pawl systems followed by a Langevin dynamics simulation of the reduced system."

  "We find that the ratchet will rotate as designed when the temperature of the pawl chamber is lower than that of the ratchet chamber, which is consistent with the second law of thermodynamics. Different parameters and configurations are tested, and the results show that the efficiency of the ratchet depends on the applied torque," wrote J.Z. Zheng and colleagues, University of Hong Kong ...read more

  2010 JUL 15 - (VerticalNews.com) -- "A basic setup for data acquisition and analysis from an oscillatory circuit is described, with focus on its application as either low-pass, high-pass, band-pass or band-reject frequency filter. A homemade board containing the RLC elements allows for the interchange of some of them, in particular, for the easy change of the R value, and this makes apparent for the student its influence on the damping factor," scientists writing in the European Journal of Physics report ...read more

  2010 JUL 15 - (VerticalNews.com) -- "The performance of quantum key distribution such as one-way continuous variable protocols, can be increased by adding some noise on the reference side of error correction in the error-correction phase," researchers in Chengdu, People's Republic of China report.

  "For this reason, we here study this possibility in the case of two-way continuous variable system," wrote M.J. Wang and colleagues, Southwest Jiaotong University ...read more