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111.
  • Kang, Yachi, 1990-, et al. (författare)
  • Numerical simulation of pressure distribution in bristle seal for turbomachinery
  • 2018
  • Ingår i: Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering. - : Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. - 1674-8530. ; 36:5, s. 420-425
  • Tidskriftsartikel (refereegranskat)abstract
    • In order to further study the pressure distribution in bristle seals, a uniformed two-dimensional closed staggered tube bundle model representing a bristle pack cross-section was proposed and the fluid flow through the bundle was solved by computational fluid dynamics(CFD) method. Accor-ding to the critical Reynolds number for boundary layer transition, a new method was proposed to decide the fluid flow regime in the bundle. The pressure and velocity distributions in the bundle were studied under various pressure differentials across the seal. The influences of distance between bristles and number of circumferential bristle rows on the pressure distribution were tackled. It is shown that the pressure distributions in the uniformed two-dimensional closed staggered tube bundle model agree well with the previous experimental data. The pressure distributions are like "V", while the velocity distributions are like the inverted "V". The pressure borne by the rear 1/3 part of the bristle pack is higher than that by the front 2/3 part. Moreover, the percentage of the pressure differential borne by the last 5 bristle rows increases with increasing total pressure differential. The pressure differential borne by the last bristle row is higher than that by a few rows in front of it. A reduced distance between bristles can allow the pressure to be distributed more even from one row to another. Bristles equally spaced can ensure an even pressure distribution rather well. Increasing the number of rows can also have the same effect. © 2018, Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. All right reserved.
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112.
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113.
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114.
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115.
  • Koptjevskaja-Tamm, Maria, 1957- (författare)
  • Approaching lexical typology
  • 2013
  • Ingår i: Classics in linguistic typology. - Bejing : Commercial press.
  • Bokkapitel (refereegranskat)
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116.
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117.
  • Larsson, Ronny, et al. (författare)
  • 原始微孢子虫
  • 2020
  • Ingår i: 微孢子虫 : 机会性病原体 - 机会性病原体. - 9787040477658 ; , s. 549-579
  • Bokkapitel (refereegranskat)
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118.
  • Levin, Paul T, 1972- (författare)
  • [Swedish Public Administrations] : [Governance in a Decentralized Unitary State]
  • 2008
  • Ingår i: [Journal of public administration]. ; 1:6
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper provides an overview of the Swedish political and public administrative system on local,regional and national levels with special reference to the impacts of EU on public administration in Sweden.It examines principles,structure and operation of the Swedish public administration,of which the experience of NPM reform is highlighted.The relationships between state and citizens,politicians and servants,and central and local governments are identified as three distinguishing characteristics of the Swedish public administration.
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119.
  • Li, G., et al. (författare)
  • Driver reliance characteristics on forward collision warning systems in adjacent vehicle cut-in situations
  • 2020
  • Ingår i: Journal of Automotive Safety and Energy. ; 11:1, s. 36-43
  • Tidskriftsartikel (refereegranskat)abstract
    • An evaluation method was investigated to assess driver reliance characteristics on forward collision warning systems based on a driving simulator to improve driving safety in adjacent vehicle cut-in situations. Using alarm timing (time to collision, TTC) as the control variable, driving behavior data from 12 participants were collected in adjacent vehicle cut-in situations. Two objective indexes (brake reliance index and secondary task index) and two subjective indexes (risk level index and trust level index) were proposed to establish the evaluation system model to realize the quantitative evaluation of driver reliance level on the systems. An L9(34) orthogonal experiment was designed and conducted. Regression models of driver reliance indexes were established. The results show that alarm timing is the most significant factor affecting driver reliance. A late alarm (TTC = 2.4 s) degrades the effectiveness of the systems, while an early alarm (TTC = 1.2 s) causes drivers’ over-reliance on the systems. Therefore, appropriately delaying the alarm timing (TTC = 1.8 s) can improve driver reliance for safety considerations.
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120.
  • Li, H. N., et al. (författare)
  • Valence band photoemission of Yb2.75C60
  • 2004
  • Ingår i: Wuli xuebao. - : Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences. - 1000-3290. ; 53:1, s. 244-247
  • Tidskriftsartikel (refereegranskat)abstract
    • Valence-band electronic density of states of Yb2.75C60 thin films was measured by the ultraviolet photoemission spectrum technique. The phase-pure Yb2.75C60 sample was characterized by the C 1s XPS measurements. The result indicates Yb2.75C60 has no Fermi edge and thus is semiconductor. The hybridization between 6s state of Yb and the LUMO band of C60 cannot be considered to be negligible. Some Yb 6s electrons occupy the Yb-C60 covalent band in Yb2.75C60.
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