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Based on the studies on the nominalization marker “de” in modern Chinese, the notion of the presupposition, and the theory of systematic functional grammar, this article attempts to demonstrate that the nominal structure “X + de” in modern Chinese can be listed as a presupposition trigger, where the “X” is presumed to be true, and the “de” is the marker of the presupposition. more...

Interpretations of the May Fourth Movement have bifurcated over time. The narrative of revolutionary history focuses on the movement’s political implications as a patriotic event or the beginning o... more...

After swelling, preformed particle gel (PPG) can be suspended in the aqueous phase to plug small pores while flowing through the formation or deform under large pressure gradients to move further into the formation, and achieve in-depth profile control. This paper, based on the size exclusion theory, introduces the concept of the critical pressure gradient to capture the phenomenon that PPG plugging small pores can deform and pass, and the concept of the mean number of bridging particles and mean bridging probability to characterize the bridging of the PPG inside large pores. On this basis the numerical simulation model of the PPG flowing through porous media, combined with the numerical simulation theory, has been established and validated with physical simulation experiments. The general regularity of the PPG migrating inside porous media is then studied using the proposed numerical simulation model. more...

Comparing with the conventional semiconductors, the choice of the two dimensional semiconductor (2DSC) materials is very limited. Based on proper electron counting, we propose a large family of 2DSCs, all adopting the same structure and consisting of only main group elements. Using advanced density functional calculations, we demonstrate the attainability of these materials, and show that they cover a large range of lattice constants, band gaps and band edge states, therefore are good candidate materials for heterojunctions. This family of two dimensional materials may pave a way toward fabrication of 2DSC devices at the same thriving level as 3D semiconductors. more...