Evolutionary Game Analysis on Safety Supervision for Coal Mine Considering Speculative Behavior

This paper considers the speculative behavior of coal mining enterprises and regulatory authorities, and uses evolutionary game theory to study safety supervision in production process of coal mine. It describes the game strategies of coal mining enterprises and regulatory authorities as safety production investment and safety supervision investment respectively. The four game scenarios are defined based on the different speculations of the two parties. The evolutionary game model is established and solved. The evolutionary game analysis is performed, and the conditions that the system evolves to four stable points are obtained. The numerical simulations are used to further analyze the influence of the parameters. The results show that when the parameters meet different conditions, the system evolves to four different stable points. The smaller the number of individuals in the regulatory authorities who choose speculative strategy, the more favorable it is for coal mining enterprises to make normal investment. The more underestimated the supervision power of the regulatory authorities, the more inclined the coal mining enterprises are to adopt speculative strategies. The higher the regulatory authorities’ assessment of the safety investment of coal mining enterprises, the more inclined regulatory authorities are to adopt speculative strategies

Unraveling Pr3+ 5d-4f emission in LiLa9(SiO4)6O2 crystals doped with Pr3+ ions

LiLa9(SiO4)(6)O-2 (LLSO) crystals doped with Pr3+ ions were grown using the slow cooling flux method. The crystals were characterized by means of luminescence and optical spectroscopy and luminescence decay measurements upon excitation in UV, VUV and X-ray range including using synchrotron radiation sources. The spectroscopic data revealed the presence Pr3+ 5d <-> 4f emission and excitation bands related to Pr3+ ions replacing La3+ i n two nonequivalent positions, and features related Pr3+ 4f -> 4f emission. The photon cascade emission is not observed in LLSO:Pr3+, since Pr3+ S-1(0) state is above the bottom of 4f(n-1)5d mixed-states band. Apart from the emission features related to Pr3+, a defect-related emission was observed upon UV, VUV, and ionizing radiation excitation. Presence of the defects was shown with thermoluminescence measurements and suggested to be the main reason for suppression the 5d -> 4f emission. Peculiarities of host-to-impurity energy transfer are analyzed and discussed

Study on REE occurrence in a Svanbergite and basic ore characteristics

Svanbergite in Sichuan Province, China is a special middle-low grade phosphorus ore. It contains rare earth elements (REEs), aluminum, and strontium that can be exploited and utilized. In this study, several methods were used to systematically study the occurrence of REEs in the ore and basic ore characteristics. The ore, which was rich in REEs, Al, and Sr, was classified as marine sedimentary low-grade phosphorus ore. The main ore mineral was crandallite and pyrite, and independent REE minerals were not found. Crandallite was the main carrier mineral of useful elements, including P, REEs, Al, and Sr. REE+ was inferred to mainly exist in crandallite via isomorphism by replacing Ca2+ and H+. The crandallite was mainly characterized as fine-grained, and minerals were closely disseminated. The results from this study will provide a valuable reference for expanding available REE resources and the efficient comprehensive utilization of svanbergite

Impurity and defect-related luminescence of Ce3+ doped LiLa9(SiO4)6O2 crystals upon UV-VUV, X-ray and cathode ray excitation

We report on the synthesis and comprehensive characterization of Ce3+ doped LiLa9(SiO4)(6)O-2 (LLSO) crystals, grown using the slow cooling flux method. The luminescence and optical spectroscopic properties and luminescence decay kinetics were studied upon excitation with UV, VUV, X-ray photons and cathode rays. Two impurity Ce3+ centres substituting for La3+ - ions in two nonequivalent crystal positions are observed in LLSO:Ce3+. They are well distinguished spectroscopically in the UV range both in emission and excitation spectra. Apart from emission associated with Ce3+ 5d -> 4f interconfigurational transitions, a low-temperature defect-related emission has been observed upon UV-VUV and higher energy X-ray excitation. Processes lying behind the temperature quenching and host-to-impurity energy transfer are analyzed and discussed

Energy conversion in LiSrPO4 doped with Pr3+ ions

We report on the time-resolved luminescence spectroscopic characterization of LiSrPO4 doped with Pr3+-ions, that we found potentially attractive for scintillation applications. The spectroscopic study included measurements of photoluminescence, X-ray excited luminescence, thermally stimulated luminescence and time-resolved pulse cathodoluminescence spectra. In addition, luminescence decay kinetics were studied upon high-frequency X-ray and pulse cathode beam excitation. LiSrPO4:Pr3+ showed Pr3+ emission connected with intraconfigurational 4f(2)-> 4f(2) and interconfigurational 4f(1)5d -> 4f(2) transitions. The presence of defects was shown with thermoluminescence measurements and suggested to be the main reason for delayed recombination of charge carriers on Pr3+ 4f(1)5d states. Some peculiarities of host-to-impurity energy transfer are discussed

Deciphering the Oncogenic Role of VPS28 Modulated by miR-491-5p in Breast Cancer Cells Using In Silico and Functional Analysis

Vacuolar protein sorting-associated protein 28 (VPS28), one of the four cytosolic proteins comprising the endosomal sorting complex required for the transport I (ESCRT-I) component, has been reported to be linked to various cancers. However, less evidence is available regarding the involvement of VPS28 in breast cancer. To this end, this study focused on exploring the function of VPS28 in breast cancer cells using th