The soundabsorption coefficients of the specimens prepared only using coal powder as pore former in the low frequency and high frequency ranges were and, respectively. The soundabsorption coefficient was thus improved with increasing amounts of coal powder, and the NRC was between and
WhatsApp: +86 18838072829The aim of the study was to prepare a porous soundabsorbing material using steel slag and fly ash as the main raw material, with coal powder and sodium silicate used as a pore former and binder respectively. The influence of the experimental conditions such as the ratio of fly ash, sintering temperature, sintering time, and porosity regulation ...
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WhatsApp: +86 18838072829Christoffer A. Masia et al. Converting raw coal powder into polycrystalline nanographite by metalassisted microwave treatment. NanoStructures NanoObjects, 2021 DOI: /
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WhatsApp: +86 18838072829Transient sorption and desorption of helium and carbon dioxide in Upper Freeport coal powder and lumps were analyzed. Differences in texture and porosity between the powder and lumps may affect the transport and interaction of the penetrant and coal. In this work, we address macroscopic and mesoscopic structural differences between powdered and nonpowdered coals that influence the rates of ...
WhatsApp: +86 18838072829In this paper, the value of initial ratio of dead zone is set at according to dry powder packing experiments. ... which is measure from the CWS made by the same coal samples. The packing efficiency is calculated by compartment packing model from the data of PSD shown in Fig. 9 (a). The samples with a larger range of PSD and more relatively ...
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