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Article ; Online: Control Technology of Roof-Cutting and Pressure Relief for Roadway Excavation with Strong Mining Small Coal Pillar

Mingzhong Wang / Hanghang Zheng / Zhenqian Ma / Hang Mu / Xiaolei Feng

Sustainability, Vol 15, Iss 2046, p

2023 Volume 2046

Abstract: In order to solve the problem of serious deformation and failure of surrounding rock and difficult maintenance of gob-side entries with strong mining-induced small coal pillars, taking the A110607 return airway of the Shanwenjiaba Coal Mine as the ... ...

Abstract	In order to solve the problem of serious deformation and failure of surrounding rock and difficult maintenance of gob-side entries with strong mining-induced small coal pillars, taking the A110607 return airway of the Shanwenjiaba Coal Mine as the engineering background, the key parameters of roof-cutting and pressure relief control technology for roadway excavation with strong mining-induced small coal pillars were studied by using two-way concentrated blasting roof-cutting and pressure relief technology, combined with theoretical analysis, numerical simulation and a field industrial test. A collaborative control scheme of “roof-cutting pressure relief + anchor cable combined support” is proposed. The test results show that when the height of roof-cutting is 8 m, the angle of roof-cutting is 15°, and when the width of the coal pillar is 3 m, the effect of roof-cutting and pressure relief is the best. Through the field blasting test, it was determined that the blast hole spacing was 800 mm, 321 charge structure was used in the intact roof, and 221 or 211 charge structures were used in the broken roof and geological structure zones. During the driving and strong mining period, the roof and floor movement of the roof-cutting section of the roadway excavation was reduced by about 38% compared with the uncut section, and the deformation of the two sides of the roadway was reduced by about 44% compared with the uncut section. It shows that the collaborative control scheme of “roof-cutting pressure relief + anchor cable combined support” has a good effect on the roadway excavation driving of small coal pillars in strong mining.
Keywords	strong mining ; numerical simulation ; roadway excavation ; roof-cutting and pressure releasing ; blasthole spacing ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
Subject code	670
Language	English
Publishing date	2023-01-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Coordinated pattern of multiple element variability in Aegiceras corniculatum propagule in shrimp aquaculture effluent habitats.

Qin, Yingying / Liang, Mingzhong / Feng, Bingbin / Zheng, Hailei

The Science of the total environment

2022 Volume 857, Issue Pt 2, Page(s) 159242

Abstract: Human activities and environment changes have changed river estuary ecosystems, which impacts element changes in coastal sediments and mangroves. Mangrove propagule chemical traits showed a systematic shift along environmental gradients. But knowledge ... ...

Abstract	Human activities and environment changes have changed river estuary ecosystems, which impacts element changes in coastal sediments and mangroves. Mangrove propagule chemical traits showed a systematic shift along environmental gradients. But knowledge about how the pattern of multi-element variability is coordinated in propagule remains limited, and the conservation of macro and trace elements in propagules is also unknown. In this study, the concentrations, variability and coordinated pattern variation of 13 elements in Aegiceras corniculatum propagule across shrimp aquaculture effluent habitats, as well as the relationship between propagule element and environment factors were explored. We used CV to quantify the variability of each element, and then explore the pattern of multi-element variability. The results showed that: (1) in the habitats affected by shrimp aquaculture, the elements content shows: C > K > Cl > N > Na > P > S > Mg > Ca > Fe > Mn > Zn > Cu, and the coefficient variation shows: Mn > Cu > Fe > Zn > S > N > P > Cl > Na > K > Mg > Ca > C, which means that the element concentration are negatively correlated with the element variability and the variability of macro-elements was more conservative than micro-elements in these habitats; (2) pH, OM, C:P, and SiO
MeSH term(s)	Animals ; Aquaculture ; Crustacea ; Ecosystem ; Estuaries ; Primulaceae
Language	English
Publishing date	2022-10-05
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2022.159242
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Article ; Online: Robust Two-Dimensional Ferromagnetism in Cr

Yang, Jielin / Wang, Xinyu / Li, Shujing / Wang, Xina / Pan, Minghu / Ai, Mingzhong / Yuan, Hui / Peng, Xiaoniu / Wang, Ruilong / Li, Quan / Zheng, Fawei / Zhang, Ping

ACS nano

2023 Volume 17, Issue 22, Page(s) 23160–23168

Abstract: The discovery of ferromagnetism in two-dimensional (2D) van der Waals crystals has generated widespread interest. The seeking of robust 2D ferromagnets with high Curie temperature ( ...

Abstract	The discovery of ferromagnetism in two-dimensional (2D) van der Waals crystals has generated widespread interest. The seeking of robust 2D ferromagnets with high Curie temperature (
Language	English
Publishing date	2023-11-05
Publishing country	United States
Document type	Journal Article
ISSN	1936-086X
ISSN (online)	1936-086X
DOI	10.1021/acsnano.3c09654
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Article ; Online: Case report

Yujiao Zheng / Jinbo Cheng / Chengjuan Gu / Mingzhong Xiao / Zuoyu Shao / Linhua Zhao / Xiaolin Tong

Frontiers in Medicine, Vol

Treatment with Pien-Tze-Huang for prolonged positive SARS-CoV-2 test results in COVID-19 patients: A report of five cases

2022 Volume 9

Abstract: Coronavirus disease 2019 (COVID-19) has rapidly spread around the world since December 2019, becoming a global pandemic. Atypical cases of COVID-19, manifesting as prolonged positive SARS-CoV-2 test results during the convalescence period, have been ... ...

Abstract	Coronavirus disease 2019 (COVID-19) has rapidly spread around the world since December 2019, becoming a global pandemic. Atypical cases of COVID-19, manifesting as prolonged positive SARS-CoV-2 test results during the convalescence period, have been encountered. These cases increase the difficulty of COVID-19 prevention and treatment. Here, we report five cases of COVID-19 patients who demonstrated prolonged positive SARS-CoV-2 tests after regular traditional Chinese medicine and western medicine treatments. After administration of Pien-Tze-Huang and cessation of previous treatments, SARS-CoV-2 tests results of the patients turned and remained negative. We believe the finding will contribute to a better understanding of atypical COVID-19 cases and hope to offer a potential therapy. Since this is a preliminary case series, larger-scale clinical trials are warranted.
Keywords	COVID-19 ; RT-PCR ; SARS-CoV-2 ; Chinese medicine ; Pien-Tze-Huang ; Medicine (General) ; R5-920
Subject code	610
Language	English
Publishing date	2022-08-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
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Article: Case report: Treatment with Pien-Tze-Huang for prolonged positive SARS-CoV-2 test results in COVID-19 patients: A report of five cases.

Zheng, Yujiao / Cheng, Jinbo / Gu, Chengjuan / Xiao, Mingzhong / Shao, Zuoyu / Zhao, Linhua / Tong, Xiaolin

Frontiers in medicine

2022 Volume 9, Page(s) 860681

Abstract	Coronavirus disease 2019 (COVID-19) has rapidly spread around the world since December 2019, becoming a global pandemic. Atypical cases of COVID-19, manifesting as prolonged positive SARS-CoV-2 test results during the convalescence period, have been encountered. These cases increase the difficulty of COVID-19 prevention and treatment. Here, we report five cases of COVID-19 patients who demonstrated prolonged positive SARS-CoV-2 tests after regular traditional Chinese medicine and western medicine treatments. After administration of Pien-Tze-Huang and cessation of previous treatments, SARS-CoV-2 tests results of the patients turned and remained negative. We believe the finding will contribute to a better understanding of atypical COVID-19 cases and hope to offer a potential therapy. Since this is a preliminary case series, larger-scale clinical trials are warranted.
Language	English
Publishing date	2022-08-09
Publishing country	Switzerland
Document type	Case Reports
ZDB-ID	2775999-4
ISSN	2296-858X
ISSN	2296-858X
DOI	10.3389/fmed.2022.860681
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Article ; Online: Identification and health risk evaluation of soil contaminated by polycyclic aromatic hydrocarbons at shale gas extraction sites based on positive matrix factorization.

Liu, Zhilei / Zheng, Tong / Chen, Qiyu / Chen, Xichao / Xie, Yi / Wang, Yuyu / Ren, Mingzhong / Gao, Zhi-Qiang / Lin, Bigui / Feng, Xidan

Chemosphere

2024 , Page(s) 141962

Abstract: The impact of shale gas extraction on surrounding environmental media remains unclear. In this study, the current state of contamination by polycyclic aromatic hydrocarbons (PAHs), which are high-frequency contaminants of shale gas, was investigated in ... ...

Abstract	The impact of shale gas extraction on surrounding environmental media remains unclear. In this study, the current state of contamination by polycyclic aromatic hydrocarbons (PAHs), which are high-frequency contaminants of shale gas, was investigated in the soil surrounding emerging shale gas development sites. The source analysis of PAHs was conducted in the soils of shale gas extraction sites using positive matrix factorization (PMF). The health risk assessment (HRA) was calculated for ingestion, dermal contact, and inhalation exposures, and the priority sources of PAHs in the soil were jointly identified by PMF and HRA to refine the contribution level of different individual PAHs to the carcinogenic risk. The results showed that both Sichuan and Chongqing mining site soils were contaminated to different degrees. Shale gas extraction has an impact on the surrounding soil, and the highest contributing source of PAHs in the mining site soil of Sichuan was anthropogenic activity, accounting for 31.6%, whereas that in the mining site soil of Chongqing was biomass combustion and mixed automobile combustion, accounting for 35.9%. At the two mining sites in Sichuan and Chongqing, none of the three exposure pathways (ingestion, dermal contact, and inhalation) posed a carcinogenic risk to children, whereas the dermal exposure pathway posed a carcinogenic risk to adults. Health risk assessments based on specific source assignments indicate that when managing soil pollution, the control of fossil fuel combustion and vehicular emissions should be prioritized.
Language	English
Publishing date	2024-04-11
Publishing country	England
Document type	Journal Article
ZDB-ID	120089-6
ISSN	1879-1298 ; 0045-6535 ; 0366-7111
ISSN (online)	1879-1298
ISSN	0045-6535 ; 0366-7111
DOI	10.1016/j.chemosphere.2024.141962
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Book ; Online: Locating the Sources of Sub-synchronous Oscillations Induced by the Control of Voltage Source Converters Based on Energy Structure and Nonlinearity Detection

Zheng, Zetian / Huang, Shaowei / Yan, Jun / Bu, Qiangsheng / Shen, Chen / Zheng, Mingzhong / Liu, Ye

2023

Abstract: The oscillation phenomena associated with the control of voltage source converters (VSCs) are widely concerning, and locating the source of these oscillations is crucial to suppressing them; therefore, this paper presents a locating scheme, based on the ... ...

Abstract	The oscillation phenomena associated with the control of voltage source converters (VSCs) are widely concerning, and locating the source of these oscillations is crucial to suppressing them; therefore, this paper presents a locating scheme, based on the energy structure and nonlinearity detection. On the one hand, the energy structure, which conforms with the principle of the energy-based method and dissipativity theory, is constructed to describe the transient energy flow for VSCs, and on this basis, a defined characteristic quantity is implemented to narrow the scope of oscillation source location; on the other hand, according to the self-sustained oscillation characteristics of VSCs, an index for nonlinearity detection is applied to locate the VSCs which produce the oscillation energy. The combination of the energy structure and nonlinearity detection could distinguish the contributions of different VSCs to the oscillation. The results of a case study implemented by the PSCAD/EMTDC simulation validate the proposed scheme.
Keywords	Electrical Engineering and Systems Science - Systems and Control
Subject code	690
Publishing date	2023-02-11
Publishing country	us
Document type	Book ; Online
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Article ; Online: Spatial distribution, impact factors, and potential health implications of trace elements in human hair from capital residents in China.

Li, Min / Ma, Yan / Du, Dongwei / Yan, Xiao / Luo, Weikeng / Xu, Rongfa / Ren, Mingzhong / Zheng, Jing / Yu, Yunjiang

Chemosphere

2023 Volume 328, Page(s) 138355

Abstract: We analyzed the levels, spatial distribution, impact factors, source apportionment, and potential health implications of trace elements (V, Zn, Cu, Mn, Ni, Mo, and Co) in 1202 human hair samples of urban residents aged 4-55 from 29 cities in China. The ... ...

Abstract	We analyzed the levels, spatial distribution, impact factors, source apportionment, and potential health implications of trace elements (V, Zn, Cu, Mn, Ni, Mo, and Co) in 1202 human hair samples of urban residents aged 4-55 from 29 cities in China. The median values of seven trace elements in hair were found in the following increasing order: Co (0.02 μg/g) < V (0.04 μg/g) < Mo (0.05 μg/g) < Ni (0.32 μg/g) < Mn (0.74 μg/g) < Cu (9.63 μg/g) < Zn (157 μg/g). The spatial distribution of these trace elements in the hair from the six geographical subdivisions varied depending on the exposure sources and impact factors. Principal component analysis (PCA) revealed that Cu, Zn, and Co in the hair samples of urban residents were primarily derived from food, whereas V, Ni, and Mn were attributed to industrial activities and food. Majority of the hair samples (up to 81%) from North China (NC) exceeded the recommended value for V content, whereas up to 59.2%, 51.3%, and 31.6% samples from Northeast China (NE) exceeded the recommended values for Co, Mn, and Ni contents, respectively. The levels of Mn, Co, Ni, Cu, and Zn were significantly higher in female hair than those in male hair, whereas the levels of Mo were higher in male than in female hair (p < 0.01). Furthermore, significantly higher Cu/Zn ratios were observed in the hair of male residents than those in the female residents (p < 0.001), indicating a higher health risk for male residents.
MeSH term(s)	Humans ; Male ; Female ; Trace Elements/analysis ; Hair/chemistry ; Cities ; China ; Principal Component Analysis ; Environmental Monitoring ; Metals, Heavy/analysis
Chemical Substances	Trace Elements ; Metals, Heavy
Language	English
Publishing date	2023-03-10
Publishing country	England
Document type	Journal Article
ZDB-ID	120089-6
ISSN	1879-1298 ; 0045-6535 ; 0366-7111
ISSN (online)	1879-1298
ISSN	0045-6535 ; 0366-7111
DOI	10.1016/j.chemosphere.2023.138355
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Article ; Online: Maternal hair segments reveal metal(loid) levels over the course of pregnancy: a preliminary study in Southern China.

Liu, Bingqing / Cai, Fengshan / Tang, Bin / Li, Jialu / Yan, Xiao / Du, Dongwei / Zheng, Jing / Ren, Mingzhong / Yu, Yunjiang

Environmental science. Processes & impacts

2023 Volume 25, Issue 10, Page(s) 1684–1693

Abstract: Characterization of metal(loid) variation during pregnancy and identification of the affecting factors are important for assessing pregnancy exposures in epidemiological studies. In this study, maternal hair was collected in three segments (each 3 cm) ... ...

Abstract	Characterization of metal(loid) variation during pregnancy and identification of the affecting factors are important for assessing pregnancy exposures in epidemiological studies. In this study, maternal hair was collected in three segments (each 3 cm) from pregnant women in Guangzhou, China. Ten metal(loid)s, including six essential trace metal(loid)s and four toxic trace metal(loid)s, were analyzed to investigate the levels of various metal(loid)s during pregnancy and the factors that influence them. Strong pairwise correlations were observed between manganese (Mn), cobalt (Co), and vanadium (V), between selenium (Se), arsenic (As), and antimony (Sb), and between cadmium (Cd) and lead (Pb). All metal(loid)s except for Se, Mn, and Co showed strong correlations among the three hair segments, and most of the metal(loid)s had good reproducibility, with intraclass correlation coefficients (ICCs) ranging from 0.510 to 0.931, except for As (ICC = 0.334), Mn (ICC = 0.231), and Co (ICC = 0.235). Zn levels decreased, while Sb increased, in maternal hair during pregnancy. Maternal sociodemographic characteristics and dietary intake affected metal(loid) levels in maternal hair. These results provide foundational data for using maternal hair segmental analysis to evaluate exposure variation to metal(loid)s during pregnancy and the potential factors associated with them.
MeSH term(s)	Female ; Humans ; Pregnancy ; Metals, Heavy/analysis ; Reproducibility of Results ; Environmental Monitoring/methods ; Arsenic/analysis ; Manganese/analysis ; Selenium/analysis ; Hair/chemistry ; China
Chemical Substances	Metals, Heavy ; Arsenic (N712M78A8G) ; Manganese (42Z2K6ZL8P) ; Selenium (H6241UJ22B)
Language	English
Publishing date	2023-10-18
Publishing country	England
Document type	Journal Article
ZDB-ID	2703814-2
ISSN	2050-7895 ; 2050-7887
ISSN (online)	2050-7895
ISSN	2050-7887
DOI	10.1039/d3em00279a
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Article ; Online: Spatial distribution, impact factors, and potential health implications of trace elements in human hair from capital residents in China

Li, Min / Ma, Yan / Du, Dongwei / Yan, Xiao / Luo, Weikeng / Xu, Rongfa / Ren, Mingzhong / Zheng, Jing / Yu, Yunjiang

Chemosphere. 2023 July, v. 328 p.138355-

2023

Abstract	We analyzed the levels, spatial distribution, impact factors, source apportionment, and potential health implications of trace elements (V, Zn, Cu, Mn, Ni, Mo, and Co) in 1202 human hair samples of urban residents aged 4–55 from 29 cities in China. The median values of seven trace elements in hair were found in the following increasing order: Co (0.02 μg/g) < V (0.04 μg/g) < Mo (0.05 μg/g) < Ni (0.32 μg/g) < Mn (0.74 μg/g) < Cu (9.63 μg/g) < Zn (157 μg/g). The spatial distribution of these trace elements in the hair from the six geographical subdivisions varied depending on the exposure sources and impact factors. Principal component analysis (PCA) revealed that Cu, Zn, and Co in the hair samples of urban residents were primarily derived from food, whereas V, Ni, and Mn were attributed to industrial activities and food. Majority of the hair samples (up to 81%) from North China (NC) exceeded the recommended value for V content, whereas up to 59.2%, 51.3%, and 31.6% samples from Northeast China (NE) exceeded the recommended values for Co, Mn, and Ni contents, respectively. The levels of Mn, Co, Ni, Cu, and Zn were significantly higher in female hair than those in male hair, whereas the levels of Mo were higher in male than in female hair (p < 0.01). Furthermore, significantly higher Cu/Zn ratios were observed in the hair of male residents than those in the female residents (p < 0.001), indicating a higher health risk for male residents.
Keywords	capital ; females ; hairs ; males ; principal component analysis ; risk ; China ; Trace elements ; Hair ; Urban residents ; Impact factors ; Spatial distribution ; North China ; Northeast China ; certified reference materials ; limit of detection ; Northwest China ; East China ; South Central China ; and Southwest China
Language	English
Dates of publication	2023-07
Publishing place	Elsevier Ltd
Document type	Article ; Online
ZDB-ID	120089-6
ISSN	1879-1298 ; 0045-6535 ; 0366-7111
ISSN (online)	1879-1298
ISSN	0045-6535 ; 0366-7111
DOI	10.1016/j.chemosphere.2023.138355
Database	NAL-Catalogue (AGRICOLA)

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