We performed the fatigue test of the rotary machinery bearing, and we compared t hemeasurement value of the vibration galvanometer (acceleration, speed, displace ment) with the measurement value of the shock pulse method. We examined the actu al machine applicability of the diagnostic technology by the shock pulse method...
英字タイトル:
Applicability study of the diagnostic technology by the shock pulse method

Abstract. A scientifically correct understanding of the nature of ionizing radiation and its impact on the health has become more and more important after the accident at the Fukushima nuclear ower plant due to the Great East Japan Earthquake that occurred on March 11, 2011. We have developed the diffusion cloud chamber with the function of insertion and extraction of both a radiat ion source and a shield material independently. We demonstrated the observation of the tracks of various shape generated by al...
英字タイトル:
The Study of a Usage of Diffusion Cloud Chamber for Understanding of Ionizing Radiation (2)

In the Tokyo Electric Power Company’s Fukushima Daiichi nuclear power plant accident which results from the earthquake in the Tohoku district Pacific Ocean and the tsunami accompanying it, which occurred on March 11, 2011, a severe accident occurred, leading to reactor core damage and containment failure. As a result, a lot of radioactive materials were released into the environment from the plant. Strengthening of the counter measures against containment failure including installation of a filtered ven...
英字タイトル:
Failure Protection Measurements of Reactor Containment Vessel and Scenario for installation of Filtered Venting System

In terms of maintenance, repair and reinforcement of existing welded steel structures, it is required to evaluate the fatigue strength of welded joints and structural members with weld defects. Fatigue design guidelines specify that the fatigue strength of welded joints should be confirmed by fatigue tests reflecting the actual situation. However, it is difficult to carry out such fatigue tests in most instances. This paper proposes that the simple method to evaluate the fatigue strength of welded ...
英字タイトル:
Study of Numerical Evaluation Method for Fatigue Strength of Welded Joints and Members

In this paper, a new retrofit and strengthening method with adjusting axial force of damaged members in steel truss bridges is proposed to prevent the failure of them and collapse of bridges. The validity of this method is verified through taking this working conditions and procedures into con sideration. And also the new measures for preventive maintenance of steel truss bridges are suggested and examined against the effectiveness. In add ition, the redundancy of total structural system is discussed taki...
英字タイトル:
A Study on Retrofit and Preventive Maintenance for Steel Truss Bridges and their Redundancy

Fatigue damages have been increasing in a large number of steel bridges in Japan. In terms of repair/retrofit to fatigue damages of steel bridges, this study proposes three innovative methods for the evaluation of fatigue strength of structural members in steel bridges and the repair/retrofit of fatigue damages in l-girder bridges and steel plate deck bridges. Firstly, the simple calculation method to evaluate fatigue strength of welded joints with defects and fatigue cracks, was proposed based on fracture...
英字タイトル:
New Attempts on Repair/Retrofit of Steel Bridges