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| 1 | Challenges in the Mining and Utilization of Deep Mineral Resources显示文摘 | Meifeng Cai Edwin T. Brown | 2017 | Engineering2017，3，4： | 29 |
| 2 | Prediction and prevention of rockburst in metal mines--A case study of Sanshandao gold mine显示文摘Rockburst is a kind of artificial earthquake induced by human activities,such as mining excavations.The mechanism of rockburst induced by mining disturbance is revealed in terms of energy in this context.For understanding the rockburst mechanism,two necessary conditions for the occurrence of rockburst are presented:(1)the rock mass has the capability to store huge amount of energy and possesses a strong bumping-prone characteristic when damaged;and(2)the geological conditions in the mining area have favorable geo-stress environments that can form high-stress concentration area and accumulate huge energy.These two conditions are also the basic criteria for prediction of rockburst.In view of energy analysis,it is observed that artificial and natural earthquakes have similar regularities in many aspects,such as the relationship between the energy value and burst magnitude.By using the relationship between energy and magnitude of natural earthquake,rockburst is predicted by disturbance energy analysis.A practical example is illustrated using the above-mentioned theorem and technique to predict rockburst in a gold mine in China.Finally,the prevention and control techniques of rockburst are also provided based on the knowledge of the rockburst mechanism. | meifeng cai | 2016 | Journal of Rock Mechanics and Geotechnical Engineering2016，8，2： | 18 |
| 3 | Analysis of air quality characteristics of Beijing–Tianjin–Hebei and its surrounding air pollution transport channel cities in China显示文摘Beijing–Tianjin–Hebei(BTH)and its surrounding areas are very important to air pollution control in China.To analyze the characteristics of BTH and its surrounding areas of China,we collected 5,641,440 air quality data from 161 air monitoring stations and 37,123,000 continuous monitoring data from air polluting enterprises in BTH and surrounding cities to establish an indicator system for urban air quality portraits.The results showed that particulate matter with aerodynamic diameters of<2.5μm(PM2.5),particulate matter with aerodynamic diameters of<10μm(PM10)and SO2 improved significantly in 31 cities from2015 to 2018,but ozone deteriorated.Air quality in BTH and the surrounding areas showed obvious seasonal characteristics,among which PM2.5,PM10,SO2,and NO2 showed a'U'type distribution from January to December,while O3 had an'inverted U'distribution.The hourly changes in air quality revealed that peaks of PM2.5,PM10 and NO2 appeared from 8:00 to 10:00,while those for O3 appeared at 15:00–16:00.The exposure characteristics of the 31 cities showed that six districts in Beijing had the highest air quality population exposure,and that exposure levels in Zhengzhou,Puyang,Anyang,Jincheng were higher than the average of the 31 investigated cities.Additionally,multiple linear regression revealed a negative correlation between meteorological factors(especially wind and precipitation)and air quality,while a positive correlation existed between industrial pollution emissions and air quality in most of BTH and its surrounding cities. | Cuicui Xiao Miao Chang Peikun Guo Meifeng Gu Yang Li | 2020 | Journal of Environmental Sciences2020，32，1： | 15 |
| 4 | Application and reliability analysis of DPM system in site investigation of HK weathered granite显示文摘A drilling process monitor (DPM) for ground characterization of weathered granite is presented. The monitor is portable and can be mounted on a hydraulic rotary drilling rig to record various drilling parameters in real time during normal subsurface in- vestigation. The identification method for dominative and subsidiary interfaces has been established. The study reveals that the monitored drilling parameters are dependent on geotechnical materials and can be further applied to characterize ground interfaces. The t-test between manual logging and DPM logging has been carried out. The results show that the DPM has high accuracy in inter- faces detection and well agreement with the manual logging. The findings show that the device and data analysis method are of po- tential application in subsurface drilling exploration in weathered granites. It also seems to have prospective uses in the determination of orebody boundary as well as in the detection of geohazards. | Zhuoying Tan Meifeng Cai Zhongqi Yue L.G. Tham C.F. Lee | 2005 | Journal of University of Science and Technology Beijing2005，12，6： | 12 |
| 5 | Fluid Inclusion and H-O Isotope Geochemistry of the Phapon Gold Deposit, NW Laos: Implications for Fluid Source and Ore Genesis显示文摘The Phapon gold deposit, located in northern Laos, is a unique large-scale gold deposit in Luang Prabang-Loei metallogenic belt. It is hosted in the Lower Permian limestone and controlled by a NE-trending ductile-brittle fault system. There are three types of primary ore including auriferous calcite vein type, disseminated type, and breccia type, and the first two are important in the Phapon gold deposit. Based on fluid inclusion petrography and microthermometry, three types of primary fluid inclusions including type 1 liquid-rich aqueous, type 2 vapor-rich aqueous and type 3 daughter mineralbearing aqueous were identified in hydrothermal calcite grains. The ore-forming fluids are normally homogeneous, as indicated by the widespread type 1 inclusions with identical composition. The coexistence of type 1 and type 2 inclusions, showing similar final homogenization temperature but different compositions, indicate that fluid immiscibility did locally take place in both two types of ores. The results of microthermometry and H-O isotopes geochemistry indicate that there are little differences on ore-fluid geochemistry between the auriferous calcite vein-type and disseminated type ores. The oreforming fluids are characterized by medium-low temperatures(157–268 oC) and low salinity(1.6 wt.%–9.9 wt.% NaCl eq.). It is likely to have a metamorphic-dominant mixed source, which could be associated with dehydration and decarbonisation of Lower Permian limestone and Middle–Upper Triassic sandstones during the dynamic metamorphism. The fluid-wallrock interaction played a major role, and the locally occurred fluid-immiscible processes played a subordinate role in gold precipitation. Combined with the regional and ore deposit geology, and ore-fluid geochemistry, we suggest that the Phapon gold deposit is best considered to be a member of the epizonal orogenic deposit class. | Linnan Guo Shusheng Liu Lin Hou Jieting Wang Meifeng Shi Qiming Zhang Fei Nie Yongfei Yang Zhimin Peng | 2019 | Journal of Earth Science2019，30，1： | 11 |
| 6 | Modeling the spatial distribution of urban population during the daytime and at night based on land use: A case study in Beijing, China显示文摘城市的人口在白天期间并且在夜里和他们的空间分发是为计划城市的基础结构,公共服务和灾难地势的重要的底。当当前的人口统计不能在夜里在白天期间把城市的人口与那区分开来,这个领域里的存在研究是相当有限的。这篇论文试着由建立一个关系模型让人口,陆地使用和时间(白天或夜里)的三个部件探索人口的不同类型的时间、空间的特征在这个方面推进研究,它被瞄准在白天期间并且在夜里估计城市的人口并且在格子规模分析他们的空间特征。而且,实验案例研究在中国北京在 Haidian 区域被执行了测试模型。结果如下:(1 ) 城市的人口的空间结构在夜里与那在白天期间显著地不同。城市的人口的空间分发在白天期间是更广泛的,更多聚结那那在夜里。( 2 )在人口之间的空间联合关系的几种类型在在夜里的白天和那期间被识别了,例如三明治模式,对称模式,集中模式和单个模式,等等( 3 )白天和夜间人口的空间分发也在中国的发展期间反映某些因素例如旧居住区域,新工业区域的构造,和城市、农村的区域之间的差别的分发。 | QI Wei LIU Shenghe GAO Xiaolu ZHAO Meifeng | 2015 | Journal of Geographical Sciences2015，25，6： | 8 |
| 7 | Expression of neurocan mRNA and ultrastructure of brain tissue after cerebral ischemia and reperfusion in stroke-prone renovascular hypertensive rats treated by electroacupuncture显示文摘We established a stroke-prone renovascular hypertensive rat model by bilateral constriction of the renal artery with sliver loop clips. After ten weeks, middle cerebral artery occlusion was induced for 2 hours. The rats then received electro-acupuncture at Baihui (DU 20) and Dazhui (DU 14) after onset of ischemia for 30 days. In situ hybridization study showed that electroacupuncture significantly reduced the number of neurocan mRNA-positive cells in the ischemic penumbra and hippocampal tissues of rats. Electron microscopy results demonstrated that the structure of neurons and blood vessels in the ischemic tissues were restored with electroacupuncture. Overall, these data suggest that electroacupuncture may protect neurons against ischemic reperfusion injury in stroke-prone renovascular hypertensive rats, which may be regulated by downregulation of expression of nerve inhibitory factor neurocan mRNA. | Feng Tan Saiying Wan Haike Wu Qiwen HUO Jinliang Wang Wenlin Chen Meifeng Fang Xiaolin Liu Xuewen Wang Jingbo Sun | 2011 | Neural Regeneration Research2011，6，36： | 8 |
| 8 | Advance of in-situ stress measurement in China显示文摘In-situ stress is an essential parameter for design and construction of most engineering projects that involve excavation in rocks.Progress in in-situ stress measurement from the 1950s in China is briefly introduced.Stress relief by overcoring technique and hydraulic fracturing technique are the two main techniques for in-situ stress measurement in China at present.To make them suitable for application at great depth and to increase their measuring reliability and accuracy,a series of techniques have been developed.Applications and achievements of in-situ stress measurement in Chinese rock engineering,including mining,geotechnical and hydropower engineering,and earthquake prediction,are introduced.Suggestions for further development of in-situ stress measurement are also proposed. | Meifeng Cai Hua Peng | 2011 | Journal of Rock Mechanics and Geotechnical Engineering2011，3，4： | 8 |
| 9 | Evaluation on Stability of Stope Structure Based on Nonlinear Dynamics of Coupling Artificial Neural Network显示文摘The nonlinear dynamical behaviors of artificial neural network (ANN) and their application to science and engineering were summarized. The mechanism of two kinds of dynamical processes, i.e. weight dynamics and activation dynamics in neural networks, and the stability of computing in structural analysis and design were stated briefly. It was successfully applied to nonlinear neural network to evaluate the stability of underground stope structure in a gold mine. With the application of BP network, it is proven that the neuro-com- puting is a practical and advanced tool for solving large-scale underground rock engineering problems. | Meifeng Cai Xingping Lai | 2002 | Journal of University of Science and Technology Beijing2002，9，1： | 7 |
| 10 | Considerations of rock dilation on modeling failure and deformation of hard rocks-a case study of the mine-by test tunnel in Canada显示文摘For the compressive stress-induced failure of tunnels at depth, rock fracturing process is often closely associated with the generation of surface parallel fractures in the initial stage, and shear failure is likely to occur in the final process during the formation of shear bands, breakouts or V-shaped notches close to the excavation boundaries. However, the perfectly elastoplastic, strain-softening and elasto-brittle-plastic models cannot reasonably describe the brittle failure of hard rock tunnels under high in-situ stress conditions. These approaches often underestimate the depth of failure and overestimate the lateral extent of failure near the excavation. Based on a practical case of the mine-by test tunnel at an underground research laboratory (URL) in Canada, the influence of rock mass dilation on the depth and extent of failure and deformation is investigated using a calibrated cohesion weakening and frictional strengthening (CWFS) model. It can be found that, when modeling brittle failure of rock masses, the calibrated CWFS model with a constant dilation angle can capture the depth and extent of stress-induced brittle failure in hard rocks at a low confinement if the stress path is correctly represented, as demonstrated by the failure shape observed in the tunnel. However, using a constant dilation angle cannot simulate the nonlinear deformation behavior near the excavation boundary accurately because the dependence of rock mass dilation on confinement and plastic shear strain is not considered. It is illustrated from the numerical simulations that the proposed plastic shear strain and confinement-dependent dilation angle model in combination with the calibrated CWFS model implemented in FLAC can reasonably reveal both rock mass failure and displacement distribution in vicinity of the excavation simultaneously. The simulation results are in good agreement with the field observations and displacement measurement data. | Xingguang Zhao Meifeng Cai MCai | 2010 | Journal of Rock Mechanics and Geotechnical Engineering2010，2，4： | 7 |
| 11 | Effect of electrolysis voltage on electrochemical reduction of titanium oxide to titanium in molten calcium chloride显示文摘The electrochemical reduction of solid TiO2 directly to solid metal is a promising alternative to the current Kroll process. The present work is aimed at studying the effect of electrolysis voltage on the rate of electrochemical reduction. The products of electrochemical reduction of TiO2 and Ti2O were examined using the scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The results show that Ti2O was reduced to low valent titanium oxide at 1.5-1.7 V, which was the result of ionization of oxygen. TiO2 and Ti2O were reduced to titanium metal at 2.1-3.1 V, which was the co-action of ionization of oxygen and calciothermic reduction. The oxygen content decreased rapidly with voltage increas-ing from 2.1 to 2.6 V, while it changed little from 2.6 to 3.1 V. The optimized cell voltage was 2.6-3.1 V. | LIU Meifeng LU Shigang KAN Surong LI Guoxun | 2007 | Rare Metals2007，26，6： | 7 |
| 12 | Geochronology and Petrochemistry of Volcanic Rocks in the Xaignabouli Area, NW Laos显示文摘An integrated study of zircon U-Pb geochronology and petrochemistry, together with zircon Lu-Hf isotopes, has been carried out on the basaltic-andesitic tuff and volcanic breccia from the Nam Hang Formation and andesitic tuff from the Muang-Nan Formation in the Xaignabouli area, which had been mapped as the Permian–Early Triassic on the 1 : 1 000 000 geological map or Late Carboniferous on the 1 : 200 000 geological maps. Zircon U-Pb dating of three samples yielded weighted mean ages of 235±2.6, 232±1.4 and 278±2.8 Ma, respectively, suggesting a Late Triassic origin for the Nam Hang Formation and an Early Permian origin for the Muang-Nan Formation. Geochemically, they are characterized by depletions in HFSEs(e.g., Nb, Ta, Ti) and high LILE/HFSE ratios, and they have positive zircon ε_(Hf)(t) values of 8.7–15.9, which exhibits the continental arc volcanic affinity and partial melting of subducting oceanic slab in the magma source. Combined with spatial occurrence of the volcanic rock and existing geochronological and geochemical data, we suggest that the Xaignabouli-Luang Prabang volcanic belt can be linked to the Loei-Phetchabun belt. The Permian–Triassic volcanic rocks in this belt might be a product of the Nan back-arc basin eastward subduction. | Meifeng Shi Zhenbo Wu Shusheng Liu Zhimin Peng Linnan Guo Fei Nie Siwei Xu | 2019 | Journal of Earth Science2019，30，1： | 6 |
| 13 | Key Engineering Technologies to Achieve Green, Intelligent, and Sustainable Development of Deep Metal Mines in China显示文摘1.Introduction Metal mineral resources are the most important industrial raw materials in the world and play an indispensable role in the development of the national economy,social and material civilization,and scientific and technological progress.After decades of sustained and high-intensity development,shallow metal mineral resources in China have gradually decreased and are nearly exhausted[1];thus,the exploitation of metal mineral resources is comprehensively advancing toward greater depths.At present,more than 20 underground metal mines have reached or exceeded a mining depth of 1000 m[2].According to statistics,the mining depth of more than one-third of China’s underground metal mines will exceed 1000 m over the next decade,and the maximum mining depth will range from 2000 to 3000 m.It has been predicted that,with the advancement of exploration technology and the increase in exploration depth,it is entirely possible to encounter several large metal deposits at depths ranging from 3000 to 5000 m in China.Consequently,deep mining is the most urgent problem facing the development of metal mines in China,while remaining the most important way to ensure the sustainable development and supply of metal mineral resources in the future.Against this background,we propose key engineering technologies to address the problems presented by deep mining from a strategic perspective. | Meifeng Cai Peng Li Wenhui Tan Fenhua Ren | 2021 | Engineering2021，7，11： | 6 |
| 14 | Spatial Differentiation and Influencing Mechanism of Medical Care Accessibility in Beijing:A Migrant Equality Perspective显示文摘Spatial equality of access to basic public services, especially medical care services which are directly related to life safety, is the first step to achieve the goal of equalization of basic public services for all the people proposed by central government of China. Using the spatial analysis and the statistical analysis, this study evaluates the spatial differentiation of medical care facilities accessibility by constructing STT(Shortest Travel-Time) and SAI(Spatial Accessibility Index). And then this study explores the neighborhood effects on the medical care facilities accessibility in Beijing, with a particular focus on the effect of neighborhood migrant proportion by constructing spatial dependent regression model. The spatial accessibility analysis of medical care facilities show that the spatial distribution of medical care facilities was basically consistent with administrative regions but not with population demands. Bivariate LISA cluster maps identify that suburban areas are the overlapped clusters of high percent of migrants and limited medical care services. This is associated with the public service allocation rule in China, which stresses equality within urban areas and within rural areas but overlooks equality between urban areas and rural areas; and stresses local resident demands but overlooks migrant demands. To estimate the effects on medical care accessibility of neighborhood migrant proportion, spatial dependence models are applied due to spatial dependence of accessibility of medical care facilities. The regression results show that neighborhoods with high percent of migrants, even conditioning on neighborhood SES, are related to limited spatial accessibility of medical care services. Besides neighborhood characteristics, another important factor influencing spatial accessibility of medical care services is the process of spatial spillover effects. This indicates that the attenuate accessibility of medical care services for migrants is not only because of their own constraints but also because of their proximity to other disadvantaged neighborhoods. Therefore, it is urgently needed to increase the medical facilities in the suburban areas, to take into account migrants' demands and to reduce residential segregation between local residents and migrants for local governments to achieve the goal of equalization of medical care service. | ZHAO Meifeng LIU Shenghe QI Wei | 2018 | Chinese Geographical Science2018，28，2： | 5 |
| 15 | Dynamic destabilization analysis based on AE experiment of deep-seated,steep-inclined and extra-thick coal seam显示文摘No.5 coal seam in Huating Coal Mine is a deep-seated,steep-inclined extra-thick coal seam where excavation disturbance is quite frequent.The maximum and minimum principal stresses differ widely.During mining,dynamical destabilization happens frequently and induce tragedies.Based on the comparison between the acoustic emission(AE)experiment on dynamical destabiliza- tion of coal rock and the related in situ testing results,this article provides comprehensive analysis on the regular quantificational AE patterns(energy rate,total events)of coal rock destabilization in complex-variable environment.The comparison parameters include dynamic tension energy rate,deformation resistance to compression,and shear stress. | Fenhua Ren Xmgpmg Lai Meifeng Cai | 2008 | Journal of University of Science and Technology Beijing2008，15，3： | 5 |
| 16 | Stress Measurement with an Improved Hollow Inclusion Technique In Jinchuan Nickel Mine显示文摘Borehole overcoring stress measurement with an improved hollow inclusion technique was carried out at 10 points on 3 levels in Jinchuan nickel mine which is situated in north-west of China. Through the measurement, 3-D in situ stress state at the measuring points and distribution characteristics of the stress field in the mine were obtained. The stress state in Jinchuan mine is dominated by the horizontal tectonic stress field. The maximum principal stress is horizontal which is about twice the weight of the overburden and its orientation is approximately vertical to the regional tectonic line. The difference between two horizontal principal stresses is quite large which is an important reason to cause failure of underground excavations. | Meifeng Cai, Lan Qiao, Bo Yu, Shuanghong Wang (Resources Engineering School, University of Science and Technology Beijing, Beijing 100083) | 2000 | International Journal of Minerals,Metallurgy and Materials2000，14，3： | 5 |
| 17 | Prognostic value of interim ^(18)F-FDG PET/CT in diffuse large B-cell lymphoma显示文摘Objective: Diffuse large B-cell lymphoma (DLBCL) is a heterogeneous disease. The prognostic factor currently used is not accurate enough to predict the outcomes of patients with DLBCL. The prognostic significance of interim PET/CT in DLBCL remains controversial. The aim of this study is to determine the predictive value of interim 18F-FDG PET/CT after first-line treatment in patients with DLBCL. Methods: Thirty-two patients with DLBCL underwent baseline, interim and post-treatment 18F-FDG PET/CT scans. Imaging results were analyzed for the survival of patients via software SPSS 13.0, retrospectively. Results: Thirty-one of the 32 patients were treated with R-CHOP regimen, and interim 18F-FDG PET/CT of 24 patients was performed after 2 cycles of treatment. After a median follow-up period of 16.7 months, the 2-year progression-free survival (PFS) rates were significantly different between the groups above and below SUV max cut-off value of 2.5 (P=0.039). No significant differences were found in the 2-year PFS rates if SUV max cut-off values were set as 2.0 and 3.0, respectively (P=0.360; P=0.113). Conclusions: Interim PET/CT could predict the prognosis of DLBCL patients with the SUV max cut-off value of 2.5, but more clinical data should be concluded to confirm this conclusion. | Zhitao Ying Xuejuan Wang Yuqin Song Wen Zheng Xiaopei Wang Yan Xie Ningjing Lin Meifeng Tu Lingyan Ping Weiping Liu Lijuan Deng Chen Zhang Zhi Yang Jun Zhu | 2013 | Chinese Journal of Cancer Research2013，25，1： | 4 |
| 18 | New Re-Os Dating of Auriferous Pyrite from the Suoluogou Large Gold Deposit in Muli County, West Sichuan Province显示文摘The Suoluogou gold depositin Muli County of SichuanProvince is located in the southern section of the Ganzi-Litang suture zone (Fig.la), which is the largest golddeposit discovered in this suture zone in recent years. Atpresent, the exploration of the Suoluogou gold deposit isstill in progress, and the amount of resource is increasing. | NIE Fei LIU Shusheng SHI Meifeng SHI Hongzhao FAN Wenyu | 2018 | Acta Geologica Sinica(English Edition)2018，92，3： | 4 |
| 19 | Exploring the differential impacts of urban transit system on the spatial distribution of local and floating population in Beijing显示文摘流动人口成为了城市的人口的主要司机瓷器大城市里的过多的生长。城市的运输系统(UTS ) 是在人口的一个重要因素在城市的区域以内的空间分布,特别快速、高能力的运输系统。这份报纸在北京大城市的区域(BMA ) 分析在 2000 和 2010 之间的高速公路和地铁的延期的原因的效果,集中于本地居民和流动人口之间的组差别。由于交通改进和人口生长的 endogeneity,仪器的变量(IV ) 回归模型被使用避免这个问题。结果证明本地居民在内部郊区增加了,但是在城市中心减少了,当流动人口在多数区域增加了时。IV 回归结果证明城市的运输系统的扩展越过 BMA 在人口生长上有统计上重要的影响。结果也证明城市的地铁系统的延期越过 BMA 比本地居民在流动人口上有更多的效果。它被城市的地铁系统的相当低的费用主要引起。这暗示城市的地铁系统上的过多的津贴能导致过多的流动人口生长和居住区别,甚至居住的分离。因此,计划并且设计合理、科学的城市的运输系统以便推进合理人口尺寸并且支持居住集成是必要的。而且,地区性的分析证明本地居民上的城市的交通改进的效果不在内部郊区是统计上重要的。它暗示城市的交通改进在劝诱人搬到郊外的区域并且在北京控制中心城市人口上限制了效果。因此,它应该被强调在城市的计划和人口的进程的人口分发上的城市的交通改进的区分的效果控制。 | ZHAO Meifeng LIU Shenghe QI Wei | 2017 | Journal of Geographical Sciences2017，27，6： | 4 |
| 20 | GIS-based 3D limit equilibrium analysis for design optimization of a 600 m high slope in an open pit mine显示文摘Combining the GIS (geographic information systems) grid-based data with four proposed column-based 3D slope stability analysis models, a comprehensive solution of a high-steep open-pit slope has been obtained. For six searching ranges, 19 critical slip surfaces of different sizes have been studied, in which the minimum 3D safety factor is 1.33. Comparison of 3D safety factors of des- igned and proposed slope plans shows for all the critical slip surfaces for the proposed plan, the smallest 3D safety factor is 1.33 under the most unfavorable condition. This means that the proposed plan of the high slopes, about 600 m, of an open pit (2-5o steeper than designed plan) is feasible. | Meifeng Cai Mowen Xie Chunlei Li | 2007 | Journal of University of Science and Technology Beijing2007，14，1： | 4 |
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