Nagaoka University of Technology

Yonex Kabushiki Kaisha

Tsutomu Takahashi

Naoto Ogawa

Masato Kawabata

Hitoshi Kato

Yumiko Yoshitake

Nao Komata

Yukiko Ueki

Masataka Shirakashi

Toshihiro Kawano

A racket includes: a grip; an annular frame; and a shaft coupling the grip and the frame together; wherein a projection is provided to an outer peripheral face on a leading end half of the frame in a predetermined range including a location of maximum curvature in a peripheral direction.

Racket and grommet

Provided are a rotary device for fluid power generation and a fluid power generation device that are capable of converting the kinetic energy of a fluid to an electric energy. By utilizing a longitudinal vortex as a driving force, a rotary body such as a cylinder as a high-strength and tough wing-shaped member can be rotated, and power can be efficiently generated in a wide range of flow rate without letting the longitudinal vortex disappear even if the flow rate changes in a wide range. This rotary device for power generation includes a rotary body; and a wake bodythat is a distance away from the rotary bodytoward the downstream side of a flow directionof the fluid, and has at least one crossover section at which the wake bodyintersects with the rotary body

Rotary device for fluid power generation

A planar elongational viscosity measuring method and apparatus which can advance analysis of planar elongational viscosities for high-viscosity and low-viscosity fluids. As a bomb-shell like bobis pushed into a container, a non-Newtonian fluidreaches a planar elongation state in a side space G, counterforce F applied to the bomb-shell like bobat this time is measured, planar elongation stress &#x3c3; is calculated using the counterforce F and conditions input by a user based on push-up force, the counterforce F, and the horizontal cross-sectional area of the side space G, and the planar elongation stress is divided by a planar elongation speed &#x3b5;', thereby acquiring a planar elongational viscosity &#x3b7;. Accordingly, it becomes possible to acquire planar elongational viscosities of not only a high-viscosity non-Newtonian fluid, but also a low-viscosity non-Newtonian fluid which is not likely to be solidified, resulting in an advancement of analysis of planar elongational viscosities for high-viscosity and low-viscosity fluids.

Planar elongational viscosity measuring method and planar elongational viscosity measuring apparatus

Growing community of inventors

Niigata, Japan

Tsutomu Takahashi