In a commercialized, fully artificial plant factory, artificial luminaire is arranged in a unified way using a general illumination theory, an actual measurement, or an empirical methodology. However, with these metho...In a commercialized, fully artificial plant factory, artificial luminaire is arranged in a unified way using a general illumination theory, an actual measurement, or an empirical methodology. However, with these methods, lightings are implemented without considering specific optical characteristics of lighting or material characteristics of each component that constructs a cultivation system, resulting in an amount of light that becomes irregular. The amount of lighting is closely related with the growth and quality of crops, and the deviation between points where cultivated crops are located causes quality difference in the produced crops, thus impairing the economic feasibility of a plant factory. In this regard, a simulation to figure out an optimum lighting layout was performed. Arrangements based on the spectrum distribution of light source and reflector materials were implemented to ascertain the distance between lighting and height of lighting and gather information in the pre-treatment process to improve the uniformity of light in the plant cultivation system. Improvement of around 15% in light uniformity is achieved compared with the existing system after the simulation is carried out. This result would reduce the deviation in crop growth to make uniform quality crop production possible.展开更多
As China's cities shift from breakneck expansion to improving the layout and functions of existing urban spaces,the questions facing policymakers are no longer how to attract migrants,but how to integrate them;not...As China's cities shift from breakneck expansion to improving the layout and functions of existing urban spaces,the questions facing policymakers are no longer how to attract migrants,but how to integrate them;not how to build new megaprojects,but how to make cities more livable and inclusive.These themes were front and center at the China Sustainable Urbanization Forum:Theory,Policy and Practice2025,held at Tsinghua University on November 13,where officials,scholars and industry experts gathered to weigh the challenges facing the next planning cycle and the reforms needed to meet them.展开更多
基金financially supported by the Ministry of Education, Science, and Technology (MEST)the National Research Foundation of Korea (NRF) through the Human Resource Training Project for Regional Innovationsupported by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (No.20114010203040) grant funded by the Korean government’s Ministry of Knowledge Economy
文摘In a commercialized, fully artificial plant factory, artificial luminaire is arranged in a unified way using a general illumination theory, an actual measurement, or an empirical methodology. However, with these methods, lightings are implemented without considering specific optical characteristics of lighting or material characteristics of each component that constructs a cultivation system, resulting in an amount of light that becomes irregular. The amount of lighting is closely related with the growth and quality of crops, and the deviation between points where cultivated crops are located causes quality difference in the produced crops, thus impairing the economic feasibility of a plant factory. In this regard, a simulation to figure out an optimum lighting layout was performed. Arrangements based on the spectrum distribution of light source and reflector materials were implemented to ascertain the distance between lighting and height of lighting and gather information in the pre-treatment process to improve the uniformity of light in the plant cultivation system. Improvement of around 15% in light uniformity is achieved compared with the existing system after the simulation is carried out. This result would reduce the deviation in crop growth to make uniform quality crop production possible.
文摘As China's cities shift from breakneck expansion to improving the layout and functions of existing urban spaces,the questions facing policymakers are no longer how to attract migrants,but how to integrate them;not how to build new megaprojects,but how to make cities more livable and inclusive.These themes were front and center at the China Sustainable Urbanization Forum:Theory,Policy and Practice2025,held at Tsinghua University on November 13,where officials,scholars and industry experts gathered to weigh the challenges facing the next planning cycle and the reforms needed to meet them.
