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Abstract As a unit of measurement for Chinese ancient construction, the yingzao chi (yingzaochi 营造尺) is of great significance to study long-term transformation of culture, construction skills, and the scale design rule of Chinese regional architectural heritage. But few scholars study the restoration method of the yingzao chi of palace buildings sans dougong (斗拱) in Chinese Ming and Qing Dynasties. Based on the yingzao chi theory, this paper studies and improves a theoretical method to help restore the yingzao chi of palace buildings sans dougong in Ming and Qing Dynasties. This method is not limited by the lack of reference of vernacular chi (xiangchi 乡尺) and can restore the yingzao chi of a single building through surveying data, and there is a smaller error in the calculation process. Three typical palace buildings without dougong in Ming and Qing Dynasties in Chongqing are selected as examples. The results show that the restored yingzao chi of these three buildings is highly similar, most likely 320.7–323.6 mm, which can verify the reliability of this method. This study can help to improve the research of yingzao chi and provide theoretical support for the protection of this kind of architectural heritage. Besides, the restoration of the yingzao chi provides a potential opportunity to explore how the technological and cultural of palace architecture spread, develop and blend.

As a unit of measurement for Chinese ancient construction, the yingzao chi (yingzaochi 营造尺) is of great significance to study long-term transformation of culture, construction skills, and the scale design rule of Chinese regional architectural heritage. But few scholars study the restoration method of the yingzao chi of palace buildings sans dougong (斗拱) in Chinese Ming and Qing Dynasties. Based on the yingzao chi theory, this paper studies and improves a theoretical method to help restore the yingzao chi of palace buildings sans dougong in Ming and Qing Dynasties. This method is not limited by the lack of reference of vernacular chi (xiangchi 乡尺) and can restore the yingzao chi of a single building through surveying data, and there is a smaller error in the calculation process. Three typical palace buildings without dougong in Ming and Qing Dynasties in Chongqing are selected as examples. The results show that the restored yingzao chi of these three buildings is highly similar, most likely 320.7–323.6 mm, which can verify the reliability of this method. This study can help to improve the research of yingzao chi and provide theoretical support for the protection of this kind of architectural heritage. Besides, the restoration of the yingzao chi provides a potential opportunity to explore how the technological and cultural of palace architecture spread, develop and blend. [ABSTRACT FROM AUTHOR]

This study developed an objective approach for determining fire source location based on an artificial neural network (ANN) model. The samples for the ANN model were obtained from computational fluid dynamics simulations. A data preprocessor was devised to transform numerical simulation results into a format that could be used by the ANN model prior to network training, and bootstrap aggregation was used to improve the model's predictive performance, which was evaluated by the leave-one-out approach. The results show that the 95% left-tailed confidence limit was 0.7921 m for planar dimensions of 5 m × 5 m, which is sufficiently accurate for practical application. Additionally, comprehensive experiments were conducted in the confined space of a fire compartment that was geometrically similar to various fire source locations to explore soot patterns and verify the ANN model. The experimental results reveal that the differences between the locations determined in scaling experiments and the locations predicted by the ANN were invariably less than 1 m. In particular, the difference was only 0.17 m when the fire source was located in the centre of the fire compartment. These results demonstrate the feasibility of the devised ANN model for reconstructing fire source location in engineering applications. [ABSTRACT FROM AUTHOR]

This study developed an objective approach for determining fire source location based on an artificial neural network (ANN) model. The samples for the ANN model were obtained from computational fluid dynamics simulations. A data preprocessor was devised to transform numerical simulation results into a format that could be used by the ANN model prior to network training, and bootstrap aggregation was used to improve the model’s predictive performance, which was evaluated by the leave-one-out approach. The results show that the 95% left-tailed confidence limit was 0.7921 m for planar dimensions of 5 m × 5 m, which is sufficiently accurate for practical application. Additionally, comprehensive experiments were conducted in the confined space of a fire compartment that was geometrically similar to various fire source locations to explore soot patterns and verify the ANN model. The experimental results reveal that the differences between the locations determined in scaling experiments and the locations predicted by the ANN were invariably less than 1 m. In particular, the difference was only 0.17 m when the fire source was located in the centre of the fire compartment. These results demonstrate the feasibility of the devised ANN model for reconstructing fire source location in engineering applications.

Coupled resonators formed on both sides of a printed circuit board (PCB) are proposed. In the resonators, the lower of the resonant frequencies of two coupled modes generated by strong coupling of the two resonators on opposite sides of the substrate is much smaller than that of a single resonator. In addition, by making use of the extremely large difference between the resonant frequencies, a resonator with small size and a good spurious characteristic is realized. In the present paper, of the structures with especially strong coupling, coupled resonators of open ring, multi-open ring, and spiral shapes are studied. From the point of view of resonator miniaturization and spurious characteristics, two coupled resonant frequencies are studied experimentally and by numerical simulation. As the substrate thickness is reduced, the coupling between the resonators becomes stronger, so that the lower resonant frequency f0 is reduced and the ratio f1/f2 of the first and second resonant frequencies of the resonator increases. Of the resonators studied, it is found experimentally that the resonant frequency is lowest in the spiral-shaped coupled resonator. Also, its f1/f0 is the largest, with a value of 3 or more. Further, the unloaded Q of the coupled resonators is measured. It is experimentally demonstrated that the spiral shape is advantageous in terms of the unloaded Q. Finally, a two-pole Chebyshev bandpass filter is fabricated using spiral coupled resonators. It is experimentally found that an excellent spurious characteristic can be realized. © 2006 Wiley Periodicals, Inc. Electron Comm Jpn Pt 2, 89(4): 51–59, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjb.20164 [ABSTRACT FROM AUTHOR]