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  • Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)  (5)
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  • Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)  (5)
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  • 1
    Online Resource
    Online Resource
    Multi-objective optimization of magnetorheological clutch with stationary housing
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Mechanics Vol. 44, No. 4 ( 2022-12-31), p. 500-513
    Details
    In: Vietnam Journal of Mechanics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 44, No. 4 ( 2022-12-31), p. 500-513
    Abstract: This study focuses on the development of magnetorheological fluid (MRF) based clutch systems for speed control of a rotary load. A new configuration for speed control of a rotary shaft using a magnetorheological clutch (MRC) with stationary winding housing and its mathematical model are proposed based on the Bingham plastic model of MRF. Multi-objective design optimization for MRCs simultaneously considering power consumption, transmitting torque, and rotating mass is then studied based on the derived mathematical model and electromagnetic finite element analysis (FEA) of the MRC. Subsequently, an optimal configuration of the proposed MRC is manufactured and experimentally investigated.
    Type of Medium: Online Resource
    ISSN: 2815-5882 , 0866-7136
    URL: Article
    DOI: 10.15625/0866-7136/17979
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Xây dựng giải pháp tìm kiếm trong cơ sở dũ liệu ảnh với thông tin mô tả mờ
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2012
    In:  Journal of Computer Science and Cybernetics Vol. 24, No. 3 ( 2012-05-05)
    Details
    In: Journal of Computer Science and Cybernetics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 24, No. 3 ( 2012-05-05)
    Type of Medium: Online Resource
    ISSN: 1813-9663 , 1813-9663
    URL: Article
    DOI: 10.15625/1813-9663/24/3/624
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2012
    SSG: 24,1
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    INVESTIGATION ON EFFECT OF SURFACE ROUGHNESS PATTERN TO DYNAMIC PERFORMANCE OF MEMS RESONATORS IN VARIOUS TYPES OF GASES AND GAS RAREFACTION
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Vietnam Journal of Science and Technology Vol. 59, No. 5 ( 2021-10-26)
    Details
    In: Vietnam Journal of Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 59, No. 5 ( 2021-10-26)
    Abstract: The average modified molecular gas lubrication (MMGL) equation, which is modified with pressure flow factors and effective viscosity, is utilized to analyze the squeeze film damping (SFD) on micro-beam resonators considering effect of surface roughness pattern in various types of gases and gas rarefaction. Then, effect of surface roughness pattern (film thickness ratio and Peklenik number) is discussed on the quality factor (Q-factor) of micro-beam resonators in various types of gases and gas rarefaction. Thus, effect of surface roughness pattern is significantly reduced as effective viscosity of gas decreases in higher mode of resonator and higher gas rarefaction.
    Type of Medium: Online Resource
    ISSN: 2525-2518 , 2525-2518
    URL: Article
    DOI: 10.15625/2525-2518/59/5/15478
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
    Location Call Number Limitation Availability
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Precision Frequency Measurement for He-Ne/ I〈SUB〉2〈/SUB〉 Laser Emission with kHz- Accuracy
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2012
    In:  Communications in Physics Vol. 22, No. 2 ( 2012-08-01), p. 161-
    Details
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 22, No. 2 ( 2012-08-01), p. 161-
    Abstract: An accurate and precise frequency measurement of S.I. unit traceability is essential not only in the field of frequency metrology but also in many fundamental scientific researches, because an accurate and precise frequency will be able to provide stable reference frequency related quantities like length and time -- the two important elements of physics. In this paper we present our frequency measurement for laser emission of the He-Ne/I2 laser system at the kHz accuracy and precision level. A frequency beat measurement of the laser under test with the standard frequency from a frequency optical comb is conducted. The second measurement method based on the heterodyne technique, where the beats between the hyperfine frequencies of 127I2 isotope at frequency of 474 THz and the testing He-Ne laser frequency recorded. The measurement data from different measurement techniques show a good consistency and therefore the given data are reliable.
    Type of Medium: Online Resource
    ISSN: 2815-5947 , 0868-3166
    URL: Issue
    URL: Article
    DOI: 10.15625/0868-3166-22-2
    DOI: 10.15625/0868-3166/22/2/1615
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2012
    Location Call Number Limitation Availability
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Effects of temperature and relative humidity on resonant frequency of mems cantilever resonators under atmospheric pressure
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Science and Technology Vol. 60, No. 4 ( 2022-08-31), p. 726-738
    Details
    In: Vietnam Journal of Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 60, No. 4 ( 2022-08-31), p. 726-738
    Abstract: In this study, the effects of temperature and relative humidity on the resonant frequency of a micro-electro-mechanical system (MEMS) cantilever resonator under atmospheric pressure (p=101325 Pa) are discussed. The squeeze film damping (SFD) problem of MEMS cantilever resonators is modeled by solving the modified molecular gas lubrication (MMGL) equation, the equation of motion of micro-cantilever, and their appropriate boundary conditions, simultaneously in the eigen-value problem. The effective viscosity (µeff(RH, T)) of moist air is utilized to modify the MMGL equation to consider the effects of temperature and relative humidity under atmospheric pressure. Thus, the effects of temperature (T) and relative humidity (RH) on the resonant frequency of MEMS cantilever resonators over a wide range of gap thicknesses and under atmospheric pressure are discussed. The results showed that the frequency shift increases as the relative humidity and temperature increase. The influence of relative humidity on the resonant frequency becomes more significant under conditions of higher temperature and smaller gap thickness.
    Type of Medium: Online Resource
    ISSN: 2815-5874 , 2525-2518
    URL: Article
    DOI: 10.15625/2525-2518/16347
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
    Location Call Number Limitation Availability
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    Online Resource
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