以《Annals of Tourism Research》、《Tourism Management》、《Journal of Travel Research》三大旅游研究期刊和Elsevier Science、EBSCOHost、SAGE三大数据库作为检索源,获得自1982年以来航空旅游业研究的相关文献94篇。分析结果显...以《Annals of Tourism Research》、《Tourism Management》、《Journal of Travel Research》三大旅游研究期刊和Elsevier Science、EBSCOHost、SAGE三大数据库作为检索源,获得自1982年以来航空旅游业研究的相关文献94篇。分析结果显示:30年来,国外航空旅游业在管理体制演化、商业模式创新、客源结构变迁和对目的地环境影响等方面取得了较多的研究成果;研究内容涉及航空政策变迁及对旅游经济的影响、商业模式创新对航空旅游业的影响、航空旅游业的环境影响及控制、航空旅游业市场营销及评估等4个方面。可将航空旅游业30年的研究历程分为:起步、发展和深化3个阶段,每一个阶段在研究方法、研究内容方面均存在较大差异。未来的研究需要更加关注航空交通与出游方式选择的相互影响、航空旅游业对目的地的影响评估、航空旅游产业结构关系的演化等方面。展开更多
The object of this article is to investigate the energy evolution mechanism and failure criteria of cross-jointed samples containing an opening during deformation and failure based on the uniaxial compression test and...The object of this article is to investigate the energy evolution mechanism and failure criteria of cross-jointed samples containing an opening during deformation and failure based on the uniaxial compression test and rock energy principle.The results show that the energy evolution characteristics of the samples correspond to a typical progressive damage mode.The peak total energy,peak elastic energy,and total input energy of the samples all first decrease and then increase with an increase of half of the included angle,reaching their minimum values when this angle is 45°,while the dissipated energy generally increases with this angle.The existence of the opening and cross joints can obviously weaken the energy storage capacity of the rock,and the change in the included angle of the cross joint has a great influence on the elastic energy ratio of the sample before the peak stress,which leads to some differences in the distribution laws of the input energy.The continuous change and the subsequent sharp change in the rate of change in the energy consumption ratio can be used as the criteria of the crack initiation and propagation and the unstable failure of the sample,respectively.展开更多
文摘以《Annals of Tourism Research》、《Tourism Management》、《Journal of Travel Research》三大旅游研究期刊和Elsevier Science、EBSCOHost、SAGE三大数据库作为检索源,获得自1982年以来航空旅游业研究的相关文献94篇。分析结果显示:30年来,国外航空旅游业在管理体制演化、商业模式创新、客源结构变迁和对目的地环境影响等方面取得了较多的研究成果;研究内容涉及航空政策变迁及对旅游经济的影响、商业模式创新对航空旅游业的影响、航空旅游业的环境影响及控制、航空旅游业市场营销及评估等4个方面。可将航空旅游业30年的研究历程分为:起步、发展和深化3个阶段,每一个阶段在研究方法、研究内容方面均存在较大差异。未来的研究需要更加关注航空交通与出游方式选择的相互影响、航空旅游业对目的地的影响评估、航空旅游产业结构关系的演化等方面。
基金Project(FRF-TP-20-041A1)supported by the Fundamental Research Funds for the Central Universities,ChinaProjects(2016YFC0600801,2017YFC0804103)supported by the State Key Research Development Program of ChinaProjects(51774022,52074020)supported by the National Natural Science Foundation of China。
文摘The object of this article is to investigate the energy evolution mechanism and failure criteria of cross-jointed samples containing an opening during deformation and failure based on the uniaxial compression test and rock energy principle.The results show that the energy evolution characteristics of the samples correspond to a typical progressive damage mode.The peak total energy,peak elastic energy,and total input energy of the samples all first decrease and then increase with an increase of half of the included angle,reaching their minimum values when this angle is 45°,while the dissipated energy generally increases with this angle.The existence of the opening and cross joints can obviously weaken the energy storage capacity of the rock,and the change in the included angle of the cross joint has a great influence on the elastic energy ratio of the sample before the peak stress,which leads to some differences in the distribution laws of the input energy.The continuous change and the subsequent sharp change in the rate of change in the energy consumption ratio can be used as the criteria of the crack initiation and propagation and the unstable failure of the sample,respectively.