Abstract: The carbon nanotube structure in which a plurality of carbon nanotubes are assembled includes a joining portion of end portions of carbon nanotubes and a joining portion of an end portion and a side wall portion of the carbon nanotubes.

Abstract: A steel sheet is provided, having a tensile strength of 590 MPa or more, a particular composition and a steel structure that contains, in terms of area fraction, particular amounts of ferrite and martensite, in which the ferrite average crystal grain size is 20 ?m or less, the martensite average size is 15 ?m or less, the ratio of the average crystal grain size of the ferrite to the average size of the martensite (ferrite average crystal grain size/martensite average size) is 0.5 to 10.0, the ratio of the hardness of the martensite to the hardness of the ferrite (martensite hardness/ferrite hardness) is 1.0 or more and 5.0 or less, and, in the texture of the ferrite, the inverse intensity ratio of ?-fiber to the ?-fiber is 0.8 or more and 7.0 or less.

Abstract: Disclosed herein are a method for producing a hot-rolled steel sheet, a method for producing a cold-rolled full hard steel sheet, and methods for producing a heat-treated steel sheet that serve as the methods for producing intermediate products for obtaining a steel sheet having a tensile strength of 590 MPa or more, a particular composition and a particular steel structure.

Abstract: A single-nerve-action-potential-measuring apparatus comprises a multi-channel electrode, a space-damping-vector-calculating section, and a single nerve action potential separating and extraction section. The multi-channel electrode, which consists of multiple bunched micro electrode wires, measures the compound nerve action potential. The space-damping-vector-calculating section evaluates the damping effect corresponding to the distance between the micro electrode wires and nerve cells with no effect from a decrease in the signal-to-noise ratio. The single nerve action potential separating and extracting section extracts only the nerve action potential generated from a particular neuron by clustering the space-damping-vectors. These features enable the apparatus to separate and extract a single-nerve action spike with high precision even under conditions when the signal-to-noise ratio is low or at a site where cells are densely packed.