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Louhghalam, A.,Igusa, T.,Park, C.,Choi, S.,Kim, K. Elsevier 2011 International journal of solids and structures Vol.48 No.13
<P><B>Abstract</B></P><P>Plates with rectangular openings develop stress concentrations under bending. While these stresses can be determined using finite elements, in many problems this would be difficult because a high density mesh would be needed in the neighborhood of every opening corner. In this paper, it is shown how a complex-variable conformal mapping approach can be numerically coupled with the finite element method to analyze these corner stresses. This approach can be used even with relatively coarse meshes where the finite element results, by themselves, do not resolve the stress concentrations. In essence, the method relies on finite element analysis to obtain information on the stress field in a region surrounding the plate opening; this information is subsequently used to set up the parameters of the conformal mapping approach to obtain the near field stresses at the opening corners.</P>
Jin-Seok Moon,Satoshi Kidokoro,Daisuke Todaka,Sayuri Igusa,Junya Mizoi,Kazuo Shinozaki,Kazuko Yamaguchi-Shinozaki 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
As one of the most severe stress conditions, drought strongly affects the plant growth and productivity. OsPIL1, a gene encoding a rice Phytochrome Interacting Factor (PIF)-Like transcription factor, was found to be down-regulated under drought stress condition. OsPIL1 shows a diurnal expression pattern and known to be involved in regulation of plant height. However, the mechanisms of down-regulation of OsPIL1 expression under stress conditions are remained unclear. In this study, the expression of PIF4 and PIF5, the most homologous genes of OsPIL1 in Arabidopsis, was analyzed and the expression of these genes were found to be oscillated in circadian manner and down-regulated in response to drought and low temperature similar to that of OsPIL1. To identify the regions involved in the responses to drought, low temperature and diurnal cycle, the promoter analysis of PIF4 was performed using transgenic Arabidopsis. Further promoter analysis is ongoing to specify regulatory regions in more detail.
Zhao, Longyu,Ryan, Stephen M.,Lin, Sen,Xue, Ju,Ha, Seunghyun,Igusa, Takeru,Sharp, Keith W.,Guest, James K.,Hemker, Kevin J.,Weihs, Timothy P. Elsevier 2017 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.108 No.2
<P><B>Abstract</B></P> <P>The fluidic and heat transfer capabilities of 3D woven lattice materials were reported recently under axial and bifurcated flow patterns, but three critical performance indices – pressure drop, average surface temperature and temperature uniformity – could not be optimized simultaneously using these flow patterns. Here we combine the 3D weaves with manifolds to create a novel 3D flow pattern that enhances temperature uniformity, while also maintaining low pressure drops and surface temperatures. These three properties were characterized at room temperature for a range of flow rates using water as the working fluid. Three different weaves thicknesses were investigated: 12.7mm, 6.4mm, and 3.2mm, with manifold thicknesses of 12.7mm, 19.0mm, and 22.2mm, respectively, to provide a constant, combined weave-manifold thickness of 25.4mm. The properties of this new weave/manifold system are compared to those obtained using just the manifold (with no weave) and just the weave (with no manifold). Comparisons show that the addition of the weave lowers the average substrate temperature and temperature variations significantly, although pressure drop is increased. They also show that the addition of the manifold improves temperature uniformity significantly, and also lowers the average substrate temperature and the pressure drop. No specific ratio of weave to manifold thickness was found to be superior in all of the performance indices. The thermal performances are then evaluated at different pumping powers: the weave/manifold system and its distributed array flow pattern prevail. Finite element simulations were performed on a reduced and simplified model to explain the observed experimental trends, and manifold opening patterns were manipulated to demonstrate further potential property enhancements. The multiple benefits of this manifold system can be extended to common heat exchanger media beyond weaves.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Propose and design novel flow manifold that is combined with 3D woven lattices. </LI> <LI> Characterization of pressure drop, average temperature and temperature uniformity. </LI> <LI> Much superior thermal performance with 3D woven lattices than open spaces. </LI> <LI> Comparison of the new distributive flow pattern with axial and bifurcated flow cases. </LI> <LI> Trends between experiments and simulations are in good agreement. </LI> </UL> </P>