The absorption process of radiative heat in its transmission medium and the effect of ultra-attenuation on the radiative characteristics are analyzed in detail. A method of ultra-attenuation to enhance the radiative c...The absorption process of radiative heat in its transmission medium and the effect of ultra-attenuation on the radiative characteristics are analyzed in detail. A method of ultra-attenuation to enhance the radiative characteristics of the medium is proposed. It is proved that decreasing the particle size of coatings can increase the transmission depth of radiative heat and get higher emissivity and absorptivity both theoretically and practically. Ultra-attenuation and nanocrystallization will bring a brilliant prospect to the development of radiative coatings.展开更多
The in-plane thermal conductivity of the iron-based superconductor Ca10（Pt4δAs8）（（Fe1-xPtx）2As2）5 single crystal （＂10-4-8＂, Tc = 22 K） was measured down to 80 inK. In a zero field, the residual linear term ...The in-plane thermal conductivity of the iron-based superconductor Ca10（Pt4δAs8）（（Fe1-xPtx）2As2）5 single crystal （＂10-4-8＂, Tc = 22 K） was measured down to 80 inK. In a zero field, the residual linear term ro/T is negligible, suggesting the nodeless superconducting gaps in this multiband compound. In the magnetic fields, r0/T increases rapidly, which mimics the multiband superconductor NbSe2 and LuNi2B2C with highly anisotropic gap. Such a field dependence of K0/T is an evidence for the multiple superconducting gaps with quite different magnitudes or highly anisotropic gap. Compared with the London penetration depth results of the Ca10（Pt3As8）（（Fe1-xPtx）zAs2）5 （＂10-3-8＂） compound, the 10-4-8 and 10-3-8 compounds may have a similar superconducting gap structure.展开更多
On the basis of a simple snow-atmosphere-soil transfer (SAST) model previously developed,this paper presents an improved snow-atmosphere-soil transfer (ISAST) model that has a new numerical scheme and an improved meth...On the basis of a simple snow-atmosphere-soil transfer (SAST) model previously developed,this paper presents an improved snow-atmosphere-soil transfer (ISAST) model that has a new numerical scheme and an improved method of layering the snowpack.The new model takes the snow cover temperature and ice content in the snow cover as prognostic variables.This approach,which effectively solves the snow cover temperature distribution when the snow cover is melting or freezing,lessens the iteration time and computation time,which is important for GCM simulation.In this model,the snow cover is divided into three layers (ISAST3) or seven layers (ISAST7).The simulation results obtained using the ISAST7 model agree well with observations in terms of snow depth,snow equivalent water and snow cover lifetime at five Russian sites.The new ISAST model has better simulation capacity for snow cover than the previous SAST model.When the snow cover is deep,the simulation of the ISAST7 model is better than that of the ISAST3 model.Testing shows that our ISAST model is approximately 20% faster than the SAST model.展开更多
文摘The absorption process of radiative heat in its transmission medium and the effect of ultra-attenuation on the radiative characteristics are analyzed in detail. A method of ultra-attenuation to enhance the radiative characteristics of the medium is proposed. It is proved that decreasing the particle size of coatings can increase the transmission depth of radiative heat and get higher emissivity and absorptivity both theoretically and practically. Ultra-attenuation and nanocrystallization will bring a brilliant prospect to the development of radiative coatings.
基金supported by the National Basic Research Program of China(Grant No.2012CB821402)the National Natural Science Foundation of China(Grant Nos.11422429 and 91421101)+1 种基金the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learningthe Science and Technology Commission of Shanghai Municipality of China(Grant No.15XD1500200)
文摘The in-plane thermal conductivity of the iron-based superconductor Ca10（Pt4δAs8）（（Fe1-xPtx）2As2）5 single crystal （＂10-4-8＂, Tc = 22 K） was measured down to 80 inK. In a zero field, the residual linear term ro/T is negligible, suggesting the nodeless superconducting gaps in this multiband compound. In the magnetic fields, r0/T increases rapidly, which mimics the multiband superconductor NbSe2 and LuNi2B2C with highly anisotropic gap. Such a field dependence of K0/T is an evidence for the multiple superconducting gaps with quite different magnitudes or highly anisotropic gap. Compared with the London penetration depth results of the Ca10（Pt3As8）（（Fe1-xPtx）zAs2）5 （＂10-3-8＂） compound, the 10-4-8 and 10-3-8 compounds may have a similar superconducting gap structure.
基金supported by National Natural Science Foundation of China(Grant No. 41030106)National Key Projects on Global Change Studies (Grant No. 2010CB951801)
文摘On the basis of a simple snow-atmosphere-soil transfer (SAST) model previously developed,this paper presents an improved snow-atmosphere-soil transfer (ISAST) model that has a new numerical scheme and an improved method of layering the snowpack.The new model takes the snow cover temperature and ice content in the snow cover as prognostic variables.This approach,which effectively solves the snow cover temperature distribution when the snow cover is melting or freezing,lessens the iteration time and computation time,which is important for GCM simulation.In this model,the snow cover is divided into three layers (ISAST3) or seven layers (ISAST7).The simulation results obtained using the ISAST7 model agree well with observations in terms of snow depth,snow equivalent water and snow cover lifetime at five Russian sites.The new ISAST model has better simulation capacity for snow cover than the previous SAST model.When the snow cover is deep,the simulation of the ISAST7 model is better than that of the ISAST3 model.Testing shows that our ISAST model is approximately 20% faster than the SAST model.
