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23 results on '"Shang, Xiaoguang"'

13. Study on Dynamic Disaster Mechanisms of Thick Hard Roof Induced by Hydraulic Fracturing in Surface Vertical Well

Author

Shang, Xiaoguang, Zhu, Sitao, Jiang, Fuxing, Liu, Jinhai, Li, Jiajie, Hitch, Michael, Liu, Hongliang, Tang, Shibin, Zhu, Chun, Shang, Xiaoguang, Zhu, Sitao, Jiang, Fuxing, Liu, Jinhai, Li, Jiajie, Hitch, Michael, Liu, Hongliang, Tang, Shibin, and Zhu, Chun

Abstract

With the increase in mining depth and the deterioration of mining conditions, thick and hard overburden movement frequently induces mine earthquakes and rock bursts. Some mines are expected to prevent and control super thick hard rock mine earthquakes through vertical ground well water fracturing technology. However, the dynamic underground disaster appears more intense. Taking the ʹ11.30ʹ mine earthquake in a mine in Shandong Province as the engineering background, the dynamic disaster mechanism of an extraordinarily thick and hard roof induced by hydraulic fracturing of vertical wells on the ground was studied utilizing field investigation, accident case analysis, similar material simulation test, and theoretical analysis. The main conclusions are as follows: (1) After hydraulic fracturing vertical wells on the ground, the movement mode of thick and hard roofs changed from layer‐by‐layer to overall sliding movement; (2) The influence range of the advanced abutment pressure of the working face is reduced by the hydraulic fracturing of the vertical shaft, and the peak value of the advanced abutment pressure increases. Furthermore, the advanced abutment pressureʹs peak is far from the coal wall; (3) The hydraulic fracturing technology of cross‐arranged vertical surface deep and shallow wells and the hydraulic fracturing technology of cross‐perforated surface multi‐branch horizontal wells are proposed to avoid the dynamic disaster of overall sliding movement of an extremely thick hard roof induced by surface hydraulic fracturing. Therefore, these research results provide significance for preventing and controlling mine earthquakes and rock bursts in super thick hard roof mines.

Published
2022

21. Influence of algae growth on the external insulation performance of HVDC insulators.

Author

Ouyang, Xiaogang, Jia, Zhidong, Yang, Shifang, Shang, Xiaoguang, Wang, Xilin, Chen, Hao, Zhou, Daobang, and Liu, Ruitong

Subjects
ALGAL growth, EXTERNAL insulation, HIGH-voltage direct current transmission, ELECTRIC insulators & insulation, ELECTRIC lines
Abstract

In recent years, microorganisms such as algae have been found on composite and RTV coated insulators in humid environment in southwest and southern China. Algae growth poses a potential threat to the outer insulation of electrical power system because of the special features of biological foul. Insulator samples with algae growth were obtained from transmission towers of 500 kV Tianguang DC transmission line and the influence of algae growth on the external insulation performance was studied in this paper. A measurement circuit was used to measure the partial surface conductivity of algae and non-algae dots on insulator surfaces. Water spray classification method was used to test the hydrophobicity of algae and non-algae parts of the insulators. An image processing method was proposed to discern algae on the insulator surfaces and calculate the algae coverage rate. The withstand capability of insulator were tested at working voltage and 1.2 times working voltage. The research results showed that the presence of algae increased the local salt distribution and reduced the hydrophobicity of insulator surfaces. The results also indicated that impacts of algae contanmination to withstand capability of insulators were limited when the algae coverage rate was less than 20%. [ABSTRACT FROM AUTHOR]

Published
2018
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23. Cotton Fiber Development Requires the Pentatricopeptide Repeat Protein GhIm for Splicing of Mitochondrial nad7mRNA

Author

Zhang, Dayong, Chen, Chuan, Wang, Haitang, Niu, Erli, Zhao, Peiyue, Fang, Shuai, Zhu, Guozhong, Shang, Xiaoguang, and Guo, Wangzhen

Abstract

Pentatricopeptide repeat (PPR) proteins encoded by nuclear genomes can bind to organellar RNA and are involved in the regulation of RNA metabolism. However, the functions of many PPR proteins remain unknown in plants, especially in polyploidy crops. Here, through a map-based cloning strategy and Clustered regularly interspaced short palindromic repeats/cas9 (CRISPR/cas9) gene editing technology, we cloned and verified an allotetraploid cotton immature fiber(im) mutant gene (GhImA) encoding a PPR protein in chromosome A03, that is associated with the non-fluffy fiber phenotype. GhImA protein targeted mitochondrion and could bind to mitochondrial nad7mRNA, which encodes the NAD7 subunit of Complex I. GhImA and its homolog GhImD had the same function and were dosage-dependent. GhImAin the immutant was a null allele with a 22 bp deletion in the coding region. Null GhImAresulted in the insufficient GhIm dosage, affected mitochondrial nad7pre-mRNA splicing, produced less mature nad7transcripts, and eventually reduced Complex I activities, up-regulated alternative oxidase metabolism, caused reactive oxygen species (ROS) burst and activation of stress or hormone response processes. This study indicates that the GhIm protein participates in mitochondrial nad7splicing, affects respiratory metabolism, and further regulates cotton fiber development via ATP supply and ROS balance.

Published
2021
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