Search

Taking Qidong Coal Mine as an example, this paper studies the law of groundwater migration and the characteristics of structural water control in the region, in order to provide reference for advanced precise control and regional prevention of coal mine water disasters. Based on the theory of structural water control and combined with the geological and structural background of Qidong Coal Mine and its mining area and coalfield, the step-by-step control effect of structural water control and the mode of structural water control are studied. The results are as follows: The bedrock formation morphology of Qidong Coal Mine is controlled by Sunan syncline as a whole, partly by Weimiao fault and other structures, and the Cenozoic formation morphology is also indirectly controlled by structures. Under the control of Sunan syncline, Permian coal-bearing sandstone fractured aquifer, Taihui, Ordovician limestone and aquifer IV angle unconformity contact after weathering inside or outside the mine; under the control of Weimiao fault, the aquifer of partial Permian coal-bearing sandstone fractured aquifer in the southern mining area of the mine outcrops again, and contacts with the aquifer IV angle unconformity, which makes the hydraulic connection between the aquifers. Based on the analysis results, it is considered that ① the geological structure controls the underground aquifer water by controlling the formation morphology ; ② Geological structure controls the hydraulic connection between aquifers by controlling the contact between aquifers. In order to further verify the hydraulic connection between aquifers, using the comparative analysis of water level changes and Pearson correlation coefficient, the borehole water level observation results of aquifer IV, Taihui and aquifer IV, Taihui and Ordovician limestone in the southern mining area during the water discharge test and normal water level observation period were analyzed. The results show that: ① During the water discharge test in the southern mining area, the water level changes of aquifer IV (SQ10-14) and Taihui (ST4) are basically synchronous and highly correlated; ② During the normal water level observation, there is a strong correlation between the water level changes of aquifer IV (SQ10), Taihui (ST4) and Ordovician limestone (SO2), and the correlation between different observation holes in the same aquifer is quite different. It is confirmed that, controlled by the structure, there is hydraulic connection in the angular unconformity contact area between the fourth aquifer and the bedrock aquifer in the local area of the mine. The groundwater model system (GMS) and parameter estimation (PEST) are used to study the distribution and runoff law of four water levels. The results show that the four water levels are about−7−−57m, the water level in the south is higher than that in the north, and the hydraulic gradient is larger at the Weimiao fault. The four water-bearing runoff is concentrated in the southwest and central part of the mine. The southwest runoff is northward as a whole, and the central part is mainly east-west runoff. The four water-bearing runoff bypasses the Weimiao fault.

In order to explore the characteristics and laws of coal mine safety accidents in a more in-depth and objective way, the number of coal mine accidents and deaths in 2019 and 2020 published by the State Administration of Coal Supervision and the Coal Mine Safety Network in China were statistically analyzed from different perspectives, and the situation of coal mine safety production in China was analyzed by means of pie chart, bar chart and broken line chart combined with the current domestic situation of China. The analysis shows that: on the whole, the number of coal mine accidents and deaths in China has been at a relatively low level; in terms of accident types, roof, transportation and gas accidents are the main accident types that affect coal mine safety production in China. In terms of spatial distribution, the number of coal mine accidents in China is generally more in the north than in the south. The differences of geological structure and production capacity in the north and the south lead to different causes of the high occurrence of coal mine accidents. In terms of time distribution, the number of accidents in February and March is relatively small, while the number of accidents in June, July and August is frequent and concentrated. From the point of view of the specific time period, downhole work shifts are more prone to accidents.

Background: To what extent traditional Chinese medicine (TCM) combined with mifepristone and misoprostol is beneficial for improving the complete abortion rate and duration of vaginal bleeding has been a subject of debate in the field of medical abortion. Objective: To assess the evidence regarding the complete abortion rate and duration of vaginal bleeding of medical abortion assisted by different kinds of TCM. Search Strategy: We searched electronic databases such as PubMed, Web of Science and Cochrane Library database, China National Knowledge Internet, Wan fang Database, VIP Database, and China Biology Medicine disc from 2000 to February 15, 2023. Selection Criteria: The control group was medical abortion with mifepristone and misoprostol, and the experimental group was medical abortion assisted by TCM. Data Collection and Analysis: Major data extraction included sample size, age, medicine used for abortion, outcome measures. RevMan 5.3 and Stata 15.1 software were used to assess the literature quality and perform network meta‐analysis, respectively. Main Results: A total of 73 randomized controlled trials (RCTs) with 11 683 patients and nine kinds of TCM were included in this study. Compared with mifepristone and misoprostol, eight kinds of TCM had statistical significance in improving the complete abortion rate. The effect value of Sancao decoction was 5.86 (95% confidence interval [CI] 2.53–13.58). Seven kinds of TCM shortened the duration of vaginal bleeding. The effect value of comfrey and trichosanthin decoction was −8.75 (95% CI –10.86 to −6.64). Conclusions: This network meta‐analysis showed that Lenge Zhumo decoction and Sancao decoction could have a large beneficial effect on complete abortion rate in medical abortion during early pregnancy, and comfrey and trichosanthin decoction could be the best TCM for shortening the duration of vaginal bleeding. Synopsis: As a supplementary drug for medical abortion, traditional Chinese medicine can improve the rate of complete abortion and shorten the duration of vaginal bleeding. [ABSTRACT FROM AUTHOR]

In order to deeply explore the occurrence rules and characteristics of coal mine water disasters in China, reveal the evolution trend of accidents, update accident statistics and analysis, and ensure the timeliness of relevant research, the information about coal mine water disasters in China from 2008 to 2019 published by the State Coal Mine Safety Supervision Bureau, China Coal Mine Safety Network, and coal supervision bureaus of all provinces (autonomous regions and municipalities directly under the central government) were collected using the method of mathematical statistics, this paper analyzes the four dimensions of space, time, water inrush source and mine type. The results show that: Shanxi, Guizhou and Heilongjiang are the cluster areas of water disaster accidents; the frequent occurrence period of water disasters is from March to August every year, and the accidents are relatively concentrated in the periods of 3:00-5:00, 9:00-11:00, 16:00-18:00, 22:00-24:00 every day; old goaf (kiln) water is the main source of water inrush; the number of accidents and the change trend of death toll within the statistical years are divided. They are increasing before peak, decreasing after peak and decreasing gently after peak.

The morbidity of prostate cancer (PCa) is high. Early diagnosis of recurrence after primary treatment is very important for the prognosis. Prostate specific membrane antigen (PSMA) is a transmembrane glycoprotein, with high expression in PCa. Small molecule inhibitors of the PSMA is labeled by 68Ga(68Ga-PSMA). 68Ga-PSMA is used as imaging agent for PET/CT imaging. 68Ga-PSMA PET/CT can display the distribution of prostate cancer in vivo. Many European and American countries have used 68Ga-PSMA PET/CT to find recurrent lesions in prostate cancer patients and achieved good results. This technology is still in its initial stage in China. This article reviews the research progress of 68Ga-PSMA PET/CT in prostate cancer recurrence, in order to improve the understanding of this new technology in China.