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To study the heights of the caved zone and water-conducting fracture zone in backfill mining, the failure mechanism of strata during backfill mining was analyzed, and a method for determining the heights of the two zones was proposed based on key strata theory. The movement and failure regularity of the strata above the backfilling panel were revealed through numerical simulation. Considering the geologic conditions of the CT101 backfilling panel, the height of the fracture zone was determined using the proposed method along with empirical calculation, numerical simulation, and borehole detection. The results of the new calculation method were similar to in situ measurements. The traditional empirical formula, which is based on the equivalent mining height model, resulted in large errors during calculation. The findings indicate the reliability of the new method and demonstrate its significance for creating reference data for related studies.

LiBr as a promising redox mediator (RM) has been applied in Li-O2batteries to improve oxygen evolution reaction kinetics and reduce overpotentials. However, the redox shuttle of Br3−can induce the unexpected reactions and thus cause the degradation of LiBr and the corrosion of Li anode, resulting in the poor cyclability and the low round-trip efficiency. Herein, MgBr2is firstly employed with dual functions for Li-O2batteries, which can serve as a RM and a SEI film-forming agent. The Br–is beneficial to facilitating the decomposition of Li2O2and thus decreasing the overpotential. Additionally, a uniform SEI film containing Mg and MgO generates on Li anode surface by the in-situspontaneous reactions of Mg2+and Li anode in an O2environment, which can suppress the redox shuttle of Br3−and improve the interface stability of Li anode and electrolyte. Benefiting from these advantages, the cycle life of Li-O2battery with MgBr2electrolyte is significantly extended.

We report 2 cases of familial multiple endocrine neoplasia type 1 syndrome (MEN 1) in related Malaysian Chinese individuals: the son had simultaneous primary lesions in the pancreatic tail, parathyroid, adrenal gland, and hypophysis, with metastatic tumors in the left lung, mediastinum and spine; his mother had simultaneous primary lesions in the pancreatic head, parathyroid, and hypophysis, with metastatic tumors in the liver, spine, ilium, chest wall, and rib. Genetic testing of the 2 patients showed the same mutation in exon 9 of MEN1(c.1288G>T, Glu430, encoding a stop codon). The tumors with the poorest prognosis and clinical sequelae were in the pancreas of both patients, and these were treated by percutaneous cryoablation. The number of hypoglycemic episodes in the son improved for more than 120 days, and the abdominal space occupying lesion resolved in his mother.