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W. J. Van Wagtendonk - One of the best experts on this subject based on the ideXlab platform.

  • The influence of ultrasonic vibrations upon the activity of paramecin
    Biochimica et Biophysica Acta, 2003
    Co-Authors: L. P. Zill, W. J. Van Wagtendonk
    Abstract:

    Abstract 1. 1. Completely disintegrated suspensions of Paramecia may be obtained by subjection of live Paramecia suspensions to ultrasonic vibrations (450 kilocycles, 850 watts Electrical Input, metal diaphragm container). Paramecin is largely or wholly destroyed by this treatment. 2. 2. Paramecin breis have been subjected to ultrasonic treatment under a variety of conditions. A maximum increase in activity of non-degassed samples is found to occur with an exposure of 0.5 minutes at 20 watts Electrical Input, when vibrated under an air atmosphere. A smaller secondary increased in activity occurred after 10 minutes ultrasonic treatment. When the brei is degassed and vibrated under an atmosphere of oxygen maintained with oxygen jet above sample there is only a very slight increase in activity during the first minute after which inactivation takes place. If oxygen is bubbled directly through the sample during vibration, inactivation commences immediately and continues for 5 minutes. This is then followed by an activation in 10 minutes and subsequent return to the inactivation reaction in 15 minutes. Samples degassed and vibrated under nitrogen gave an increase in activity in the first half-minute, followed by an inactivation to approximately 95% of the original activity in a minute and maintenance of this value for the remainder of the treatment. 3. 3. Centrifugation of paramecin breis after ultrasonation demonstrates that a soluble form of paramecin is not produced by ultrasonic vibration.

Colin Tschida - One of the best experts on this subject based on the ideXlab platform.

  • analysis of vibration in permanent magnet synchronous machines due to variable speed drives
    IEEE Transactions on Energy Conversion, 2017
    Co-Authors: Chenjie Lin, Shiliang Wang, Babak Fahimi, Mehdi Moallem, Colin Tschida
    Abstract:

    This paper introduces an analytical approach to investigate the stator vibration in permanent magnet synchronous motor due to variable-speed drives. The origin of vibration is studied first. Using an electromechanical impulse response, a direct link between the Electrical Input to the stator windings and acceleration of the stator is established. This model allows for efficient and accurate computation of the stator vibration in permanent magnet synchronous machines. Simulations and experiments are conducted to validate the claims.

L. P. Zill - One of the best experts on this subject based on the ideXlab platform.

  • The influence of ultrasonic vibrations upon the activity of paramecin
    Biochimica et Biophysica Acta, 2003
    Co-Authors: L. P. Zill, W. J. Van Wagtendonk
    Abstract:

    Abstract 1. 1. Completely disintegrated suspensions of Paramecia may be obtained by subjection of live Paramecia suspensions to ultrasonic vibrations (450 kilocycles, 850 watts Electrical Input, metal diaphragm container). Paramecin is largely or wholly destroyed by this treatment. 2. 2. Paramecin breis have been subjected to ultrasonic treatment under a variety of conditions. A maximum increase in activity of non-degassed samples is found to occur with an exposure of 0.5 minutes at 20 watts Electrical Input, when vibrated under an air atmosphere. A smaller secondary increased in activity occurred after 10 minutes ultrasonic treatment. When the brei is degassed and vibrated under an atmosphere of oxygen maintained with oxygen jet above sample there is only a very slight increase in activity during the first minute after which inactivation takes place. If oxygen is bubbled directly through the sample during vibration, inactivation commences immediately and continues for 5 minutes. This is then followed by an activation in 10 minutes and subsequent return to the inactivation reaction in 15 minutes. Samples degassed and vibrated under nitrogen gave an increase in activity in the first half-minute, followed by an inactivation to approximately 95% of the original activity in a minute and maintenance of this value for the remainder of the treatment. 3. 3. Centrifugation of paramecin breis after ultrasonation demonstrates that a soluble form of paramecin is not produced by ultrasonic vibration.

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

  • Necking mechanisms on porous metallic glass and W compacts using electro-discharge sintering
    Journal of Alloys and Compounds, 2012
    Co-Authors: J.y. Cho, Gian Song, Hanshin Choi, Yong-ho Kim, Taek-soo Kim, Min Ha Lee, Ho-nyun Lee, Hyun-jong Kim, Jin Kyu Lee, Eric Fleury
    Abstract:

    Abstract We report on the formation mechanism of neck during electro-discharge sintering (EDS) upon various Electrical Input energy using Cu-based metallic glass and W powders. Microstructural investigation reveals that crystalline phases are observed preferentially on the surface of the Cu-based metallic glassy powder indicating energy concentration occurs at the powder surface. Moreover, it is clearly observed that needle-like morphology on the W powder surface suggesting that both surface melting and evaporation take place, followed by rapid freezing the substance. Therefore, these results strongly support that formation of neck during EDS is closely connected to the energy convergence on the thin layer of the powder surface inducing melting or evaporation.

  • FABRICATION OF POROUS Ti- AND W-COMPACTS BY ELECTRO-DISCHARGE-SINTERING PROCESS
    Surface Review and Letters, 2010
    Co-Authors: Gian Song, Ji-seon Shin, Tae-ju Kang, Hanshin Choi
    Abstract:

    A single pulse of 0.57–1.1 kJ/0.3 g-spherical Ti-powder in size range of 30–70 μm, using a constant 450 μF capacitor, was applied to produce fully porous Ti- and W-compacts by electro-discharge sintering. Microstructure examination and hardness measurement of the porous Ti-compacts revealed that more stable necks formed with increasing Electrical Input energy up to 1.1 kJ. On the contrary, W-compacts using rectangular W-powders in size range of 5–15 μm are composed of solid region with micropore and porous layer with weak particle bonding indicating heterogeneous structure. These results suggest that the powder morphology plays a crucial role to control the porous microstructure.

N. Farhat - One of the best experts on this subject based on the ideXlab platform.