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Key technologies and engineering practices for soft-rock protective seam mining

International Journal of Mining Science and Technology 2020年第6期30卷 889-899页

作者： Xiang Cheng Guangming Zhao yingming li Xiangrui Meng Qingyi Tu State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China Geological Resources and Geological Engineering Post-Doctoral Flow Station Anhui University of Science and TechnologyHuainan 232001China Post-Doctoral Research Station Huaibei Mining Corporation LimitedHuaibei 235006China

Severe gas disasters in deep mining areas are increasing,and traditional protective coal seam mining is facing significant *** paper proposes an innovative technology using soft rock as the protective seam in the absence of an appropriate coal *** on the geological engineering conditions of the new horizontal first mining area of Luling Coal Mine in Huaibei,China,the impacts of different mining parameters of the soft-rock protective seam on the pressure-relief effect of the protected coal seam were analyzed through numerical *** unit stress of the protected coal seam,which was less than half of the primary rock stress,was used as the mining stress pressure-relief *** optimized interlayer space was found to be 59 m for the first soft-rock working face,with a 2 m mining thickness and 105 m face *** physicochemical characteristics of the orebody were analyzed,and a device selection framework for the soft-rock protective seam was *** equipment for the working face was selected,including the fully-mechanized hydraulic support and coal cutter.A production technology that combined fully-mechanized and blasting-assisted soft-rock mining was *** practices demonstrated that normal circulation operation can be achieved on the working face of the soft-rock protective seam,with an average advancement rate of 1.64 m/*** maximum residual gas pressure and content,which were measured at the cut hole position of the protected coal seams(Nos.8 and 9),decreased to 0.35 MPa and 4.87 m^3/t,*** results suggested that soft-rock protective seam mining can produce a significant gas-control effect.

关键词： Gas outburst hazard Soft-rock protective seam Pressure-relief Three-machine optimization Blasting-assisted mining Gas extraction

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Historical trends of PCBs and PBDEs as reconstructed in a lake sediment from southern Tibetan Plateau

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Journal of Environmental Sciences 2020年第12期32卷 31-38页

作者： Ruiqiang Yang Ting Xie Pu Wang yingming li Qinghua Zhang Guibin Jiang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Environment Hangzhou Institute for Advanced StudyUCASHangzhou 310024China University of Chinese Academy of Sciences Beijing 100049China Institute of Environment and Health Jianghan UniversityWuhan 430056China

High-altitude lake sediment can be used as a natural archive to reconstruct the history of pollutants. In this work, the temporal distribution of polychlorinated biphenyls(PCBs) and polybrominated diphenyl ethers(PBDEs) were determined using a high-resolution gas chromatography coupled with high-resolution mass spectrometer(HRGC/HRMS) in an alpine lake sediment core collected from the southern Tibetan Plateau(TP) to examine whether the expected decreasing trends due to the implementation of the international Conventions could be observed. The concentrations of PCBs and PBDEs in the sediment core were in the range of 11.8–142 pg/g dw and ND-457 pg/g dw, and their fluxes were in the range of 2.51–31.7 ng/(m^2 ·yr) and ND-43.2 ng/(m^2 ·yr), respectively. The prevalence of low-chlorinated(tri-CB) PCBs and low-brominated(tri-to tetra-) PBDEs in most sections of the sediment profiles was observed, suggesting that the light molecular weight PCBs and PBDEs have most likely reached lake sediments by long-range atmospheric transport from distant sources. Despite the restrictions on their applications, the sediment records for the concentrations and fluxes showed no corresponding decreasing trend with restrictions for PCBs, which suggested that these POPs(e.g., PCBs) were still emitted to the environment owing to the influence of primary or secondary emissions. To our knowledge, this is the first report on input history of atmospheric PCBs and PBDEs recorded in TP Lake sediment.

关键词： Persistent organic pollutants(POPs) PCBs PBDEs Sediment core Historical trend Tibetan Plateau

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Seasonal trend of ambient PCDD/Fs in Tianjin City, northern China using active sampling strategy

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Journal of Environmental Sciences 2012年第11期24卷 1966-1971页

作者： Lei Ding yingming li Pu Wang Xiaomin li Zongshan Zhao Qinghua Zhang Ting Tuan Guibin Jiang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The spatial concentrations, seasonal trends, profiles and congener pairs of ambient polychlorinated dibenzo-p-dioxins （PCDDs） and polychlorinated dibenzofurans （PCDFs） were investigated within a seasonally active sampling scheme during Jun 2008 and Jan 2009 in Tianjin City, northern China. The PCDD/F concentrations ranged 14.2-172 fg I-TEQ/m3 （average 69.3 fg I-TEQ/m3） in summer and （89.8-1.01） x 103 fg I-TEQ/m3 （average 509 fg I-TEQ/m3） in winter, respectively, except for the E-waste dismantling site where much higher values were observed （1.04 x 103 fg I-TEQ]m3 in summer and 7.123 x 103 fg I-TEQ/m3 in winter）. The results indicated a significantly seasonal trend with higher TEQ values in winter as compared with summer, which could be related to increased emission sources and seasonal variations of the atmospheric boundary layer height. 2,3,4,7,8-PeCDF was the dominant contributor to the total PCDD/F toxic equivalents, and 2,3,7,8-TCDD was detected at almost all the sampling sites in winter. Most of the similarly substituted PCDD/F congener pairs exhibited high correlations, suggesting that they might have similar environmental fate or sources. But different seasonal and spatial distributions of PCDD/F concentrations indicated that the emission sources might be intermittent.

关键词： PCDD/Fs seasonal trend Tianjin high-volume air sampling

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Concentrations,profiles and gas-particle partitioning of PCDD/Fs,PCBs and PBDEs in the ambient air of an E-waste dismantling area,southeast China

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Chinese Science Bulletin 2008年第4期53卷 521-528页

作者： li yingming JIANG GuiBin WANG YaWei WANG Pu ZHANG QingHua State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences ChineseAcademy of Sciences Beijing 100085 China

Polychlorinated diebenzo-p-dioxins(PCDDs),polychlorinated diebenzofurans(PCDFs),polychlorinated biphenyls(PCBs) and polybrominated diphenyl ethers(PBDEs) were monitored in the ambient air of Taizhou,an E-waste dismantling area of southeast China to evaluate their concentrations,profiles and gas-particle *** ΣPCDD/Fs concentrations ranged from 2.91 to 50.6 pg/m3,with an average of 14.3 pg/*** I-TEQs for PCDD/Fs were in the range of 0.20-3.45 pg/m3,with an average of 1.10 pg/*** ΣPCBs concentrations and TEQs ranged from 4.23 to 11.35 ng/m3,0.050 to 0.859 pg(TEQ)/m3,*** concentrations of ΣPBDEs ranged from 92 to 3086 pg/m3,with an average of 894 pg/*** pollution levels of PCDD/Fs,PCBs and PBDEs were higher than other urban sites,which may be associated with the E-waste dismantling *** PCDD/Fs were found exclusively in the particle phase whereas PCBs distributed dominantly in the gas *** gas-partilce partitioning was also assessed by correlating the gas-particle partition coefficient(Kp) with the subcooled liquid vapor pressure(PL0).The measured particulate sorptions of PCDD/Fs,PCBs and PBDEs were compared with the predictions from Junge-Pankow model and Koa absorption *** Junge-Pankow model well estimated the particulate fractions of ***,it underestimated the sorptions of PCDD/Fs and overestimated the fractions of *** predicted particulate fractions of PCDD/Fs and PCBs from Koa model fitted well with the measured data.

关键词：中国东南部空气污染污染物多溴化二苯醚全氟辛烷磺酸

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Variation of airborne quartz in air of Beijing during the Asia-Pacific Economic Cooperation Economic Leaders' Meeting

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Journal of Environmental Sciences 2016年第1期28卷 62-68页

作者： Gang li yingming li Hongxing Zhang Honghua li Guanjun Gao Qian Zhou Yuan Gao Wenjuan li Huizhong Sun Xiaoke Wang Qinghua Zhang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing Urban Ecosystem Research Station Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Institute of Environment and Health Jianghan University

Quartz particles are a toxic component of airborne paniculate matter（PM）.Quartz concentrations were analyzed by X-ray diffraction in eighty-seven airborne PM samples collected from three locations in Beijing before,during,and after the Asia-Pacific Economic Cooperation（APEC） Leaders＇ Meeting in *** results showed that the mean concentrations of quartz in PM samples from the two urban sites were considerably higher than those from the rural *** quartz concentrations in samples collected after the APEC meeting,when the pollution restriction lever was lifted,were higher than those in the samples collected before or during the APEC *** quartz concentrations ranged from 0.97 to 13.2 μg/m^3,which were among the highest values amid those reported from other *** highest quartz concentration exceeded the Californian Office of Environmental Health Hazard Assessment reference exposure level and was close to the occupational threshold limit values for occupational ***,a correlation analysis showed that quartz concentrations were positively correlated with concentrations of pollution parameters PM10,PM2.5,SO2 and NOx,but were negatively correlated with O3 *** results suggest that the airborne quartz particles may potentially pose health risks to the general population of Beijing.

关键词： Air pollution Carcinogen Haze PM10 Quartz

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Determination of PCDD/Fs and dioxin-like PCBs in food and feed using gas chromatography-triple quadrupole mass spectrometry

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Science China Chemistry 2017年第5期60卷 670-677页

作者： Huizhong Sun Pu Wang Honghua li yingming li Shucheng Zheng Julius Matsiko Yanfen Hao Weiwei Zhang Dou Wang Qinghua Zhang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China Institute of Environment and Health Jianghan University Wuhan 430056 China

A method was developed on a gas chromatograph coupled to a triple quadrupole mass spectrometer(GC-MS/MS) for trace level determination of polychlorinated dibenzo-p-dioxins/dibenzofurans(PCDD/Fs) and dioxin-like polychlorinated biphenyls(DL-PCBs) in food and feed. The results demonstrated good sensitivity and repeatability for PCDD/Fs and DL-PCBs at an extremely low level(10 pg mL^(-1) for 2,3,7,8-TCDD/F), as well as wide linear response of over 3 or 4 orders of magnitude in concentration ranges; 0.5–200 ng mL^(-1) for PeCDD/F and 0.2–2000 ng mL^(-1) for DL-PCBs. The method detection limits for PCDD/Fs and DL-PCBs were in the range from 0.018–0.17 pg g^(-1) to 0.13–0.36 pg g^(-1), respectively. The performance of the GC-MS/MS for food and feed sample analysis showed high precision and accuracy compared to the high resolution gas chromatograph/high resolution mass spectrometer. The results indicated the feasibility of GC-MS/MS as a confirmatory method for the measurement of PCDD/Fs and DL-PCBs in food and feed as required by European Union legislation.

关键词： PCDD/Fs DL-PCBs food feed GC-MS/MS

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Few-shot font style transfer with multiple style encoders

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Science China(Information Sciences) 2022年第6期65卷 83-84页

作者： Kejun ZHANG Rui ZHANG Yonglin WU Yifei li Yonggen liNG Bolin WANG lingyun SUN yingming li State Key Lab of CAD&CG Zhejiang University School of Software Technology Zhejiang University Robotics X Tencent College of Information Science & Electronic Engineering Zhejiang University

Dear editor,From the sketch to an encapsulated font, text font design is a labor-intensive and time-consuming process that relies heavily on the expertise of designers and usually takes months,even years, for a professional institution. This scenario is particularly prominent for glyph-rich scripts, such as Chinese, where each character is composed of varying numbers of highly complex structured components.

关键词： Font Generation Image-to-Image Translation GANs Multi-task Learning Font Fusion Style Transfer

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Spatial concentration,congener profiles and inhalation risk assessment of PCDD/Fs and PCBs in the atmosphere of Tianjin,China

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Chinese Science Bulletin 2013年第9期58卷 971-978页

作者： DING Lei li yingming WANG Pu li XiaoMin ZHAO ZongShan RUAN Ting ZHANG QingHua State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of Sciences

Polychlorinated dibenzo-p-dioxins/dibenzofurans(PCDD/Fs) and polychlorinated biphenyls(PCBs) were monitored in a seasonal passive sampling scheme during June 2008 and January 2009 to investigate the spatial concentration,congener profiles and evaluate the potential inhalation risk in different functional areas in Tianjin,*** spatial air concentrations and I-TEQs ranged 1.08×102-8.19×10 3 fg m-3(average 2.63×103 fg m-3) and 4.08-325 fg I-TEQ m-3(average 91.4 fg I-TEQ m-3) respectively for PCDD/*** concentration and I-TEQs of PCBs were 3.08×104-3.01×105 fg m-3(average 1.39×105 fg m-3) and 1.72-49.6 fg I-TEQ m-3(average 18.5 fg I-TEQ m-3).It is obvious that PCB concentrations were several hundred times higher than the PCDD/***,the ambient air PCDD/Fs contributed a major part to the total toxicity equivalents,varying from 72.7% to 89.0%(average 81.8%).The atmospheric PCDD/F levels were observed to be higher in winter for most of sampling sites in the ***,inhalation risk assessment showed that local residents might suffer more risk near the point sources than those in living area,industrial zones and background area in Tianjin ***,the total daily dioxin intake was approximately several to hundreds of times lower than the WHO criteria,showing relatively low exposure risks from the impact of industry point sources in Tianjin City.

关键词： PCDD 风险评估多氯联苯空间集聚天津市中国集中度气氛

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Novel biomonitoring method for determining five classes of legacy and alternative flame retardants in human serum samples

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Journal of Environmental Sciences 2023年第9期131卷 111-122页

作者： Xiaolin Guan Gaoxin Zhang lingling Meng Mei liu liyuan Zhang Chuxuan Zhao yingming li Qinghua Zhang Guibin Jiang Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education Key Laboratory of Polymer Materials Ministry of Gansu ProvinceCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou 730070China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Department of Endocrinology and Metabology The First Affiliated Hospital of Shandong First Medical University&Shandong Provincial Qianfoshan HospitalJinan 250014China University of Chinese Academy of Sciences Beijing 100049China

Flame retardants(FRs)are ubiquitous in environment and biota and may pose harm to human *** recent years,concern regarding legacy and alternative FRs has been intensified due to their widespread production and increasing contamination in environmental and human *** this study,we developed and validated a novel analytical method for simultaneous determination of legacy and alternative FRs,including polychlorinated naphthalenes(PCNs),short-and middle-chain chlorinated paraffins(SCCPs and MCCPs),novel brominated flame retardants(NBFRs),and organophosphate esters(OPEs)in human *** samples were prepared by liquid-liquid extraction using ethyl acetate,and purified with Oasis®HLB cartridge and Florisil–silica gel *** analyses were carried out using gas chromatography-triple quadrupole mass spectrometry,highresolution gas chromatography coupled with high-resolution mass spectrometry,and gas chromatography coupled with quadrupole time-of-flight mass spectrometry,*** proposed method was validated for linearity,sensitivity,precision,accuracy,and matrix *** detection limits for NBFRs,OPEs,PCNs,SCCPs,and MCCPs were 4.6×10^(–4)–8.6×10^(–2),4.3×10^(–3)–1.3,1.1×10^(–5)–1.0×10^(–4),1.5,and 9.0×10–1 ng/mL,*** spike recoveries ranged from 73%–122%,71%–124%,75%–129%,92%–126%,and 94%–126%for NBFRs,OPEs,PCNs,SCCPs,and MCCPs,*** analytical method was applied for detection of real human *** were the dominant FRs in serum,indicating CPs were widely presented in human serum and should be pay more attention for their health risk.

关键词： Human serum Biomonitoring Novel brominated flame retardants Organophosphate esters Chlorinated paraffins Polychlorinated naphthalenes

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Concentrations and distribution of novel brominated flame retardants in the atmosphere and soil of Ny-Alesund and London Island,Svalbard,Arctic

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Journal of Environmental Sciences 2020年第11期32卷 180-185页

作者： Yanfen Hao Wenying Meng yingming li Xu Han Huili Lu Pu Wang Ruiqiang Yang Qinghua Zhang Guibin Jiang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Shenzhen Center for Disease Control and Prevention Shenzhen 518055China

Novel brominated flame retardants(NBFRs)were investigated in Arctic air and soil samples collected from Ny-?lesund and London Island,Svalbard,during Chinese scientific research expeditions to the Arctic during 2014–*** concentrations of 9 NBFRs in the Arctic air and soil were 4.9–8.7 pg/m3(average 6.8 pg/m3)and 101–201 pg/g dw(average 150 pg/g dw),*** atmospheric concentration of hexabromobenzene(HBB)was significantly correlated with that of pentabromotoluene(PBT)and pentabromobenzene(PBBz),suggesting similar source and environmental fate in the Arctic *** significant spatial difference was observed among the different sampling sites,both for air and soil samples,indicating that the effects of the scientific research stations on the occurrence of NBFRs in the Arctic were *** fugacities from soil to air of pentabromoethylbenzene(PBEB),2,3-dibromopropyl 2,4,6-tribromophenyl ether(DPTE),and decabromodiphenylethane 1,2-bis(pentabromophenyl)ethane(DBDPE)were lower than the equilibrium value,indicating a nonequilibrium state of these compounds between air and soil,the dominant impact of deposition and the net transport from air to *** correlation analysis between the measured and predicted soil-atmosphere coefficients based on the absorption model showed that the impact of the soil organic matter on the distribution of NBFRs in the Arctic region was *** the best of our knowledge,this work is one of the limited reports on atmospheric NBFRs in the Arctic and the first study to investigate the occurrence and fate of NBFRs in the Arctic soil.

关键词： Novel brominated flame retardants Arctic Soil Air Soil-atmosphere partitioning

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