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Sökning: WFRF:(Liu Johan 1960)

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  • Zhang, Yan, 1976, et al. (författare)
  • Homogenization Model Based on Micropolar Theory for the Interconnection Layer in Microsystem Packaging
  • 2006
  • Ingår i: Proceedings of the eight IEEE CPMT International Symposium on High Density Packaging and Component Failure Anlaysis (HDP´06). ; , s. 166-170
  • Konferensbidrag (refereegranskat)abstract
    • The increase in microsystem packaging density sets the requiement for component sizes in the system to become smaller and smaller. The scale decrease makes the analysis more complicated as the corresponding resolution should be improved to a great extent. Interconnection in the system is a typical interface structure that widely appear in the packaing system, in which periodic microstructures may be included inside. A homogenization model is developed in this paper, which focuses on the interface behavior. The interface model based on micropolar theory provides a natural way to include the characteristic scale that can reflect the size effect of the considered structure. Computations are carried out as the numerical example of the model, and comparisons of this model with those of the convertional method show its validity and efficiency.
  • Zhang, Yan, 1976, et al. (författare)
  • Interface Modelling of ACA Interconnects Using Micropolar Theory
  • 2006
  • Ingår i: 2005 Conference on High Density Microsystem Design and Packaging and Component Failure Analysis, HDP'05; Shanghai; China; 27 June 2005 through 29 June 2005. ; , s. Art. no. 4017426-
  • Konferensbidrag (refereegranskat)abstract
    • The contribution focuses on applying micro-polar theory which, as compared to the classical continuum theory, can offer the possiblity to include e.g. a micro-structural size-effect for the simulation and prediction of the interfacial stresses of microsystem interconnections, such as anisotropically conductive adhesives. As the dimension of the adhesive is much smaller than the chip or the substrate, it is treated as an interface zone with a finite thickness. The micro-polar theory is used in the vicinity of the interface to model the transfer of the couple stress across the interface, and a degenerated micro-polar continuum to model the interface, across which a displacement and a rotational jump is regularized. The paper is concluded by a numerical example involving the FE-representation of the interface formulation.
  • Zhang, Yan, et al. (författare)
  • Numerical investigation on thermal properties of micro-pin-fin cooler
  • 2011
  • Ingår i: Journal of Shanghai University. - 1007-6417. ; 15:4, s. 273 - 278
  • Tidskriftsartikel (refereegranskat)abstract
    • Micro-pin-fin cooler mounted on the power chip enables the heat removal to meet modern microsystem requirement. Carbon nanotubes (CNTs) have been proven as a potential material for micro-coolers due to the superior thermal conductivity, good mechanical property and so forth, and there appear various applications of CNTs in the micro-cooler technology. In the present paper, an analysis of the thermal and hydraulic characteristics of the micro-pin-fin heat sink was conducted, where air was used as the cooling medium and an impinging jet was introduced to enhance the heat transfer. Three-dimension computational fluid dynamics (CFD) simulations were carried out for micro-pin-fin coolers with various parameters, including the pin-fin size and pattern as well as the jet velocity and nozzle diameter. The flow field and thermal properties of the micro-pin-fin heat sink were obtained, and the heat removal efficiency was evaluated.
  • Zhang, Yan, 1976, et al. (författare)
  • PBGA Interconnect Behavior under Thermal Effects
  • 2007
  • Ingår i: Proceedings of International Conference on Electronics Packaging (ICEP2007), Tokyo, Japan. ; , s. 329-334
  • Konferensbidrag (refereegranskat)
  • Zhang, Yong, 1982, et al. (författare)
  • Properties of Undoped Few-Layer Graphene-Based Transparent Heaters
  • 2020
  • Ingår i: Materials. - 1996-1944. ; 13:1
  • Tidskriftsartikel (refereegranskat)abstract
    • In many applications like sensors, displays, and defoggers, there is a need for transparent and efficient heater elements produced at low cost. For this reason, we evaluated the performance of graphene-based heaters with from one to five layers of graphene on flexible and transparent polyethylene terephthalate (PET) substrates in terms of their electrothermal properties like heating/cooling rates and steady-state temperatures as a function of the input power density. We found that the heating/cooling rates followed an exponential time dependence with a time constant of just below 6 s for monolayer heaters. From the relationship between the steady-state temperatures and the input power density, a convective heat-transfer coefficient of 60 W·m−2·°C−1 was found, indicating a performance much better than that of many other types of heaters like metal thin-film-based heaters and carbon nanotube-based heaters.
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Liu, Johan, 1960 (518)
Fu, Yifeng, 1984 (89)
Ye, L. (69)
Wang, Teng, 1983 (46)
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Lai, Zonghe, 1948 (34)
Jeppson, Kjell, 1947 (31)
Zhang, Yan, 1976 (31)
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