| 1 | Lightning ablation suppression of aircraft carbon/epoxy composite laminates by metal mesh显示文摘Three-dimensional finite element(FE)models of carbon/epoxy composite laminates with copper mesh and aluminum mesh protection were established subjected to lightning strike,in which different mesh spacing was selected.Effectiveness of numerical method was verified and impulse current waveforms with different current peaks were applied according to aircraft lightning zones.Thermal-electrical material parameters varying with temperature were added into numerical models.Element deletion method was used to deal with lightning ablation elements of composite structures.The results show that ablation area and depth of composite laminates with metal mesh protection are significantly smaller,which proves good protection effectiveness of metal meshes on anti-lightning strike.The denser the mesh spacing,the better the anti-lightning strike will be.Protection of composite laminates with copper mesh has better effects than that of aluminum mesh.Considering the effect of mesh spacing variation on composite structural weight and anti-lightning strike,the ideal mesh spacing was obtained. | F.S.Wang Y.Zhang X.T.Ma Z.Wei J.F.Gao | 2019 | Journal of Materials Science & Technology2019，35，11： | 4 |
| 3 | Upstream SOEs in the mixed-ownership reform显示文摘This article explores possible options of the upstream mixed-ownership reform with imperfect substitute products in a vertically related market composed of one upstream SOE and two downstream profit-maximising retailers.Its focus is not only on incorporating the issue of privatisation into a vertical market structure,but also on extending the traditional upstream–downstream competition model by allowing the active contribution of retailers to enhance values at different costs.It finds that in a vertically related market where retailers’effort matters,the socially optimal policy towards the upstream SOE is partial privatisation regardless what product differentiation is involved,but the specific degree of privatisation is negatively correlated to the level of effort costs.By contrast,in a vertically related market without retailers’effort,the government tends to choose full nationalisation of the firm. | Qian Liu Leonard F.S.Wang | 2022 | Economic and Political Studies2022，10，4： | 0 |
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