Study on the in-situ modified support method of roadway surrounding rock under vertical impact load.

With the deepening of coal mining, the frequency and intensity of rock burst accidents are increasing. According to incomplete statistics, there have been over 200 rock burst accidents in tunnels in China alone from 2005 to 2024, resulting in more than 500 deaths and causing extensive damage to tunnel equipment. Therefore, research on tunnel surrounding rock support methods is urgently needed.

Study on full-scale pores characterization and heterogeneity of coal based on low-temperature nitrogen adsorption and low-field nuclear magnetic resonance experiments.

The characteristics and heterogeneity of coal pores are crucial for understanding the production mechanism of coalbed methane (CBM). In this study, coal samples with varying degrees of metamorphism (0.58%  ≤ R, ≤ 3.

Synthesis of 2D MoSSe semiconductor alloy by chemical vapor deposition.

Alloying/doping in two-dimensional (2D) materials is emerging as an increasingly important strategy due to the wide-range bandgap tunability and versatility of these materials. Monolayer 2D transition metal dichalcogenide (TMD) alloy has been investigated both theoretically and experimentally in recent years. Here, we synthesized a bilayer MoSSe semiconductor alloy the chemical-vapor deposition technique.

Theoretical study on the stability of the complexes A···BX [A = CHNH, NHCHNH, NHCHOH; B = Sn, Pb; X = F, Cl, Br, I].

The interaction of corresponding molecular building blocks of the complexes A···BX would provide valuable information to quickly estimate the properties of the solar cell. In this work, the H···X hydrogen bond between the organic cations A (CHNH, NHCHNH, NHCHOH) and the inorganic anions BX (B = Sn, Pb, X = F, Cl, Br, I) were studied by theoretical calculation at the B3LYP-D3/ma-def2-TZVP level to investigate the stability of the complexes A···BX. The strength of H···X hydrogen bond is enhanced in the order of NHCHNH < CHNH < NHCHOH, Sn < Pb, and weakened in the order of F > Cl > Br > I, indicating that the complexes A···BX enhances with the increase of electron donating ability of B and the decrease of electron donating ability of X, and application of the substituent A = NHCHOH may be effective to enhance the stability of perovskite and replace the toxic metal Pb by Sn.

Magneto-transport Spectroscopy of the First and Second Two-dimensional Subbands in AlGaN/GaN Quantum Point Contacts.

Magnetic transport spectroscopy is investigated in quantum point contacts (QPCs) fabricated in AlGaN/GaN heterostructures. The magnetic field perpendicular to the two-dimensional electron gas (2DEG) is shown to depopulate the quasi-one-dimensional energy levels in the first two-dimensional (2D) subband faster than those in the second one. In GaN based heterostructures, the energy levels in the second 2D subband is generally concealed in the fast course of depletion and hence rarely detected.

Enhanced anisotropic effective g factors of an Al0.25Ga0.75N/GaN heterostructure based quantum point contact.

Gate-defined quantum point contacts (QPCs) were fabricated with Al0.25Ga0.75N/GaN heterostructures grown by metal-organic chemical vapor deposition (MOCVD).