Browsing by Author "Luo, Yang"
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Item Structural phase transition and photoluminescence properties of wurtzite CdS:Eu3+ nanoparticles under high pressure(2017) Zhao, Rui; Yang, Tianye; Luo, Yang; Chuai, Mingyan; Wu, Xiaoxin; Zhang, Yanyan; Ma, Yanzhang (TTU); Zhang, MingzheHigh-pressure behaviors of wurtzite CdS and CdS:Eu3+ nanoparticles (8–10 nm) were investigated by synchrotron radiation X-ray diffraction, Raman spectroscopy, and photoluminescence under high pressure at ambient temperature. The doping of Eu ions increases the phase transition pressure from wurtzite structure to rocksalt structure (CdS = 4.76 GPa and CdS:Eu = 5.22 GPa) and so does the bulk modulus (B0) of the initial and high pressure phases. This phenomenon can be attributed to the great impact on tensile strain along the c-axis of CdS nanoparticles, which is identified by the relationship of lattice contraction and the pressure obtained from Raman 1LO. The phase transitions of all samples are partly reversible. The Eu3+ ions luminescence from 5D0 → 7FJ (J = 1, 2) transition in CdS:Eu nanoparticles emerges obviously and changes during the phase transformation, which indicate the variation of the local symmetry of the Eu3+ ions. The new peak of 5D0 → 7F3 emerges at 7.26 GPa, persisting until the end of the whole experiment. The obtained CdS nanoparticles will hold promising potential in the fabrication of effective biological sensors and photodetectors for practical application under high pressure.Item Towards a more socially sustainable and spatially just urban environment through an eco-industrial park design to revitalize a heavy industrial district: The case of Luoyang, China(2013-05) Luo, Yang; Patterson, Dennis; Houk, Brett A.; Tsai, Yung-MeiThe goal of the current dissertation is to help revitalize a heavy industrial district in a historic Chinese city through land-use rezoning of the district until the year of 2030, and this includes a proposed Eco-Industrial Park. The scope of the study is to highlight the importance of the social aspect of sustainable development of the industrial district, to address the concept of spatial justice from a land-use point of view and to explore the potential of utilizing an Eco-Industrial Park to create a more socially sustainable and spatially just industrial community in the local urban environment - beyond its economic and environmental helpfulness as has already been addressed in the existing literature. In order to achieve the creation of a more socially sustainable and spatially just environment, the Eco-Industrial Park has been designed to contain three components: an industrial core, a supporting community and buffer zones. The configuration of the Eco-Industrial Park community proposed in the current study was greatly inspired by the danwei form in the modern Chinese cities, which featured a compact urban spatial structure, walkable environment and mixed land-use. The current case, the Jianxi Industrial District in the city of Luoyang, China, carries a unique background resulting from the city’s evolutionary course which was shaped by historic, economic and political factors. The study provides a valuable example in the study of social sustainable development, spatial justice, Chinese urbanization and the overall benefits of Eco-Industrial Park.