The Experts below are selected from a list of 1041 Experts worldwide ranked by ideXlab platform

Duck-young Ko - One of the best experts on this subject based on the ideXlab platform.

  • A new measurement system of very high temperature in Atomic Pile using ultrasonic delay time
    Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239), 2001
    Co-Authors: Dong-gyu Jeong, Jong-ho Choi, Duck-young Ko
    Abstract:

    The temperature measurement of very high temperature core melt is of importance in LAVA (lower-plenum Arrested Vessel Attack) experiment in which gap formation between core melt and the reactor lower head, and the effect of the gap on thermal behavior are to be measured. The existing temperature measurement techniques have some problems, which the thermocouple, one of the contact methods, is restricted to under 2000/spl deg/C, and the infrared thermometry, one of the non-contact methods, is unable to measure an internal temperature and very sensitive to the interference from reacted gases. So, in order to solve these problems, the delay time of ultrasonic wavelets due to high temperature is suggested. As a first stage, a molten material temperature was measured up to 2000/spl deg/C. Also, the optimization design of the UTS (ultrasonic temperature sensor) with persistence at the high temperature was suggested in this paper. And the utilization of the theory suggested in this paper and the efficiency of the developed system are certified by performing experiments.

Dong-gyu Jeong - One of the best experts on this subject based on the ideXlab platform.

  • A new measurement system of very high temperature in Atomic Pile using ultrasonic delay time
    Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239), 2001
    Co-Authors: Dong-gyu Jeong, Jong-ho Choi, Duck-young Ko
    Abstract:

    The temperature measurement of very high temperature core melt is of importance in LAVA (lower-plenum Arrested Vessel Attack) experiment in which gap formation between core melt and the reactor lower head, and the effect of the gap on thermal behavior are to be measured. The existing temperature measurement techniques have some problems, which the thermocouple, one of the contact methods, is restricted to under 2000/spl deg/C, and the infrared thermometry, one of the non-contact methods, is unable to measure an internal temperature and very sensitive to the interference from reacted gases. So, in order to solve these problems, the delay time of ultrasonic wavelets due to high temperature is suggested. As a first stage, a molten material temperature was measured up to 2000/spl deg/C. Also, the optimization design of the UTS (ultrasonic temperature sensor) with persistence at the high temperature was suggested in this paper. And the utilization of the theory suggested in this paper and the efficiency of the developed system are certified by performing experiments.

Wilfrid E. Johnson - One of the best experts on this subject based on the ideXlab platform.

  • Allardice, Corbin; And Others The First Reactor, Understanding the Atom Series.
    2016
    Co-Authors: Fdrs Price, James T. Ramey, Wilfrid E. Johnson
    Abstract:

    This booklet is one of the "Understanding the Atom" Series. Consisting of three sections, it is an account of the development of the first nuclear reactor by a team of scientists led by Enrico Farmi. The first section briefly reviews the early work on nuclear fission and neutron emission, the impact of Einstein's letter to President Roosevelt, the establishment of the Manhattan Engineer District, and the preliminary work on the design and construction of the first Atomic Pile at Chicago. The section ends with an hour-by-hour description of the experiment culminating in the achievement of the first self-sustaining nuclear reaction on December 2, 1942. The second section consists of Fermi's own story of the first Atomic chain reaction, written in observance of the tenth anniversary of the event. The third section is an account by Fermi's wife of a Party to celebrate the success of the experiment. Nor narrative reveals the great secrecy surrounding the work of Fermi's team. The booklet has numerous photographs of the scientists involved in the Project, sketches of the first Atomic Pile and a Photograph of a graph indicating the neutron intensity during various stages of the operation of the Atomic Pile. Pihliography. (LC

Jong-ho Choi - One of the best experts on this subject based on the ideXlab platform.

  • A new measurement system of very high temperature in Atomic Pile using ultrasonic delay time
    Proceedings of IEEE Region 10 International Conference on Electrical and Electronic Technology. TENCON 2001 (Cat. No.01CH37239), 2001
    Co-Authors: Dong-gyu Jeong, Jong-ho Choi, Duck-young Ko
    Abstract:

    The temperature measurement of very high temperature core melt is of importance in LAVA (lower-plenum Arrested Vessel Attack) experiment in which gap formation between core melt and the reactor lower head, and the effect of the gap on thermal behavior are to be measured. The existing temperature measurement techniques have some problems, which the thermocouple, one of the contact methods, is restricted to under 2000/spl deg/C, and the infrared thermometry, one of the non-contact methods, is unable to measure an internal temperature and very sensitive to the interference from reacted gases. So, in order to solve these problems, the delay time of ultrasonic wavelets due to high temperature is suggested. As a first stage, a molten material temperature was measured up to 2000/spl deg/C. Also, the optimization design of the UTS (ultrasonic temperature sensor) with persistence at the high temperature was suggested in this paper. And the utilization of the theory suggested in this paper and the efficiency of the developed system are certified by performing experiments.

Simon Sneddon - One of the best experts on this subject based on the ideXlab platform.