Fractal analysis of thermal conduction of loose coal

A possible production area of Chinese faience? Reference to beads decorating coffins from Shijia Yucun site, Gansu Province

“…However, the date of the faience beads lacks support, and the conclusion is still controversial. The most common point is that the earliest appearances of faience beads were at Yujiawan site and Pingdingshan site in the early Western Zhou period (approximately 10th century BC) (Wang, 2019). And the earliest Chinese high‐potash faience beads were discovered in the Zhuyuangou Cemetery M5 in Baoji, Shaanxi and the Yujiawan Cemetery M94 in Gansu, dating back to the mid Western Zhou Dynasty (Wang, 2019).…”

“…The most common point is that the earliest appearances of faience beads were at Yujiawan site and Pingdingshan site in the early Western Zhou period (approximately 10th century BC) (Wang, 2019). And the earliest Chinese high‐potash faience beads were discovered in the Zhuyuangou Cemetery M5 in Baoji, Shaanxi and the Yujiawan Cemetery M94 in Gansu, dating back to the mid Western Zhou Dynasty (Wang, 2019). On the distribution of high‐potash faience beads in China, most of the them were found in Qinghai, Gansu, Shaanxi, and Shanxi so far, which are referred to as the possible production area of the locally produced faience (Figure 1).…”

“…The location of Shijia Yucun site and the distribution map of high‐potash faience unearthed from the Western Zhou Dynasty to the Spring and Autumn period (1, Shangsunjiazhai cemetery; 2, Dabuzishan site; 3, Yujiawan cemetery; 4, Zhuyuangou cemetery; 5, Sanmenxia Guo State cemetery; 6, Liangdaicun cemetery; 7, Quwo Jin Hou tomb; 8, Dahekou cemetery; 9, Hengshui Peng state cemetery; 10, Wanfunao site; 11, Shijia Yucun site; 12, Wupu cemetery; 13, Wangdahu site) (Chen et al, 2021; Lei & Xia, 2015; Lin et al, 2019; Ningxia Institute of Cultural Relics and Archaeology, Pengyang County Institute of Cultural Relics Management, 2016; Wang, 2019; Wang et al, 2020; Wen et al, 2023). …”

Effective thermal conductivity of loose residual coal in goaf: Comparative analysis of experiment and model

“…The meso-scale composition and structures in coal have different degrees of influence on their macro bulk ETC under various conditions, including the fluid (water and air) composition, face porosity and its quadrant anisotropy degree, surface morphology and face porosity, and mineral composition (species and content of mineral) of the solid skeleton or matrix (Chu et al, 2018). The TC expressions for loose coal was derived based on the simulation method of the thermal resistance and found that the change in the coal TC under specific conditions is mainly affected by the void fraction (Wang et al, 2010). The temperature and particle size of loose coal have an important impact on the heat transfer of coal (Meng et al, 2019).…”

“…However, there are few reports on the ETC model of porous residual coal in goaf. In addition, The particle size and void distribution in goaf are extremely complex and irregular (Zheng et al, 2021), which makes it difficult to determine the physical structure characteristics of goaf and thus further also limits the development and application of fractal theory in the ETC model of loose residual coal in goaf under existing experimental conditions (Wang et al, 2010). It is worth mentioning that the ETC model of porous media can effectively avoid this problem.…”