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| 1 | 温室效应的历史回顾显示文摘1824年傅立叶发现了'温室效应',1861年约翰.廷德尔发现了大气层提供热量是因为辐射通过和捕捉热辐射。过去的10 000年间,二氧化碳浓度大约是280ppm,19世纪初二氧化碳浓度开始不断上升,其原因在于化石燃料的大量燃烧和森林的丧失。科学家从不同的角度加以证实,但气候科学的不确定性不能成为不作为的借口,对温室效应做到未雨绸缪是我们的义务和责任。 | 克雷思迪安·阿瑟 杜珩(译) 杜珂(译) | 2010 | 西南民族大学学报(人文社会科学版)2010，31，6： | 7 |
| 2 | Effects of CuO Nanoparticles on Microstructure,Physical,Mechanical and Thermal Properties of Self-Compacting Cementitious Composites显示文摘In the present study,split tensile strength of self-compacting concrete with different amount of CuO nanoparticles has been investigated.CuO nanoparticles with the average particle size of 15 nm were added partially to self compacting concrete and split tensile strength of the specimens has been measured.The results indicate that CuO nanoparticles are able to improve the split tensile strength of self compacting concrete and recover the negative effects of polycarboxylate superplasticizer on split tensile strength.CuO nanoparticle as a partial replacement of cement up to 4 wt% could accelerate C-S-H gel formation as a result of increased crystalline Ca(OH)2 amount at the early ages of hydration.The increase of the CuO nanoparticles more than 4 wt% causes the decrease of the split tensile strength because of unsuitable dispersion of nanoparticles in the concrete matrix.Accelerated peak appearance in conduction calorimetry tests,more weight loss in thermogravimetric analysis and more rapid appearance of related peaks to hydrated products in X-ray diffraction(XRD) results all also indicate that CuO nanoparticles up to4 wt% could improve the mechanical and physical properties of the specimens.Finally,CuO nanoparticles could improve the pore structure of concrete and shift the distributed pores to harmless and few-harm pores. | Ali Nazari Shadi Riahi | 2011 | Journal of Materials Science & Technology2011，27，1： | 2 |
| 3 | Trends of stellar entropy along stellar evolution显示文摘This paper is devoted to discussing the difference in the thermodynamic entropy budget per baryon in each type of stellar object found in the Universe. We track and discuss the actual decrease of the stored baryonic thermodynamic entropy from the most primitive molecular cloud up to the final fate of matter in black holes, passing through evolved states of matter as found in white dwarfs and neutron stars.We then discuss the case of actual stars with different masses throughout their evolution, clarifying the role of the virial equilibrium condition for the decrease in entropy and related issues. Finally, we discuss the role of gravity in driving the composition and the structural changes of stars with different Main Sequence masses during their evolution up to the final product. Particularly, we discuss the entropy of a black hole in this context arguing that the dramatic increase in its entropy, differently from the other cases, is due to the gravitational field itself. | Marcio Guilherme Bronzato de Avellar Rodrigo Alvares de Souza Jorge Emesto Horvath | 2016 | Research in Astronomy and Astrophysics2016，16，2： | 0 |
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