分类： 工程与技术科学 >> 工程与技术科学其他学科 提交时间： 2023-01-03 合作期刊: 《2022年第三届艺术设计、传播与工程科学研讨会》
摘要： The human condition is commonly acknowledged to be dependent on light. However, the quality of light varies greatly in nature and in controlled situations, raising the question of which artificial light properties are most conducive to learning. The use of lighting in buildings is a growing area of study, a concern for visual efficiency as it relates to indoor light environment quality is now included in the notion of sustainable design. A research was conducted in the form of an experiment in order to better understand the visual efficiency of the artificial light environment, specifically on students in a classroom. The basic objective of this paper is to investigate the lighting in the classroom, as well as to determine the subjectively preferred light environment and the optimal light environment learning mode through an experimental approach, to evaluate and assess the impact of artificial light on different students in a classroom, to comprehend the impact of color temperature and illuminance while taking into account ethno-cultural variety and the personality of the students using numerous factors such as learning efficiency, learning difficulty level, learning recovery and as well as other personal criteria such as age, educational background, and previous academic experience. According to this study, peoples favorite the light environment of 1000 lx and the influence of illumination on peoples preference is greater than color temperature. There are differences in the learning efficiency because of the different educational background of the subjects under the same light environment. The best learning efficiency of the Congolese subjects occurs when the color temperature and the illuminance of the artificial light environment are 4200 K and 625 lx, respectively, and for the Cameroonian subjects, it happens in the artificial light environment with the color temperature of 5510 K and the illuminance of 700 lx. The goal research result is to offer a theoretical foundation for the design and administration of artificial light environments in university classrooms in the future.
分类： 核科学技术 >> 裂变堆工程技术 提交时间： 2023-06-18 合作期刊: 《Nuclear Science and Techniques》
摘要： Most materials can be easily corroded or ineffective in carbonaceous atmospheres at high temperatures in the reactor core of the high temperature gas-cooled reactor (HTGR). To solve the problem, a material performance test apparatus was built to provide reliable materials and technical support for relevant experiments of the HTGR. The apparatus uses a center high-purity graphite heater and surrounding thermal insulating layers made of carbon fiber felt to form a strong carbon reducing atmosphere inside the apparatus. Specially designed tungsten rhenium thermocouples which can endure high temperatures in carbonaceous atmospheres are used to control the temperature field. A typical experimental process was analyzed in the paper, which lasted 76 hours including seven stages. Experimental results showed the test apparatus could completely simulate the carbon reduction atmosphere and high temperature environment the same as that confronted in the real reactor and the performance of screened materials had been successfully tested and verified. Test temperature in the apparatus could be elevated up to 1600篊, which covered the whole temperature range of the normal operation and accident condition of HTGR and could fully meet the test requirements of materials used in the reactor.
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