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Human Health Risk Assessment Model of Organic Pollution in Groundwater:Shijiazhuang Industrial Zone

Acta Geologica Sinica(English Edition) 2011年第6期85卷 1508-1517页

作者： YANG mei FEI Yuhong ju Yiwen LI Huaqi Key Laboratory of Computational Geodynamics of Chinese Academy of Sciences College of Earth Science Graduate University of Chinese Academy Sciences Beijing 100049 China The Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological Sciences （CAGS） Shijiazhuang 050061 China Institute of Geology Chinese Academy of Geological Sciences Beijing 10003 7 China

In this study, a risk-based management model is developed and applied to an industrial zone. The models proposed by the United States Environmental Protection Agency and Han Bing have been improved by adding a residual ratio of volatile organic compounds （VOC） after boiling and deleting the related parameters in half-life. Using this improved model, an integrated process was used to assess human health risk level in the study area. Compared with water quality analysis, the results highlight the importance of applying an integrated approach for decision making on risk levels and water protection. The results of this study demonstrated that：（1） Compared with these permissible level standards in China （GB 3838-2002） and National Primary Drinking Water Regulations of the United States, the residents＇ daily life had not been affected by the groundwater in this area （except for relative bad water quality of HB3-4 and HB3-6）; （2） The typical detected organic contaminants of all groundwater samples were chloroform, carbon tetrachloride, trichloroethylene and tetrachloroethene, and the pollution sources were mainly industrial sources by preliminary investigations; （3） As for groundwater, the non-carcinogenic risk values of all samples do not exceed the permissible level of 1.0 and the carcinogenic risk values are relatively lower than the permissible level of 1.00E-06 to 1.00E-04; （4） Drinking water pathway of trichloroethylene and tetrachloroethylene mainly contribute to increasing the health risk of residents＇ in study areas; （5） In terms of non-carcinogenic risk and carcinogenic risk, the health risk order for drinking water pathway and dermal contact pathway was： drinking water pathway 〉 dermal contact pathway.

关键词： groundwater pollution organic contaminants residual rate assessment model human health risk

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Spatiotemporal Characteristics of Reference Evapotranspiration and Its Sensitivity Coefficients to Climate Factors in Huang-Huai-Hai Plain,China

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Journal of Integrative Agriculture 2013年第12期12卷 2280-2291页

作者： YANG Jian-ying liu Qin mei Xu-rong YAN Chang-rong ju Hui XU Jian-wen Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural Sciences State Engineering Laboratory of Efficient Water Use and Disaster Reduction for Crops Ministry of Agriculture Key Laboratory of Dryland Agriculture Ministry of Agriculture Key Laboratory of Agricultural Environment Ministry of Agriculture

Climate change will have important implications in water shore regions,such as Huang-Huai-Hai（3H） plain,where expected warmer and drier conditions might augment crop water *** analysis is important in understanding the relative importance of climatic variables to the variation in reference evapotranspiration（ET 0）.In this study,the 51-yr ET 0 during winter wheat and summer maize growing season were calculated from a data set of daily climate variables in 40 meteorological *** maps for key climate variables were estimated according to Kriging method and the spatial pattern of sensitivity coefficients for these key variables was *** addition,the slopes of the linear regression lines for sensitivity coefficients were *** showed that ET 0 during winter wheat growing season accounted for the largest proportion of annual ET 0,due to its long phenological days,while ET 0 was detected to decrease significantly with the magnitude of 0.5 mm yr-1in summer maize growing *** radiation is considered to be the most sensitive and primarily controlling variable for negative trend in ET 0 for summer maize season,and higher sensitive coefficient value of ET 0 to solar radiation and temperature were detected in east part and southwest part of 3H plain *** humidity was demonstrated as the most sensitive factor for ET 0 in winter wheat growing season and declining relativity humidity also primarily controlled a negative trend in ET 0,furthermore the sensitivity coefficient to relative humidity increased from west to *** eight sensitivity centrals were all found located in Shandong *** ET 0 along with its sensitivity maps under winter wheat-summer maize rotation system can be applied to predict the agricultural water demand and will assist water resources planning and management for this region.

关键词： ET 0 spatial distribution temporal trends sensitivity coefficient 3H plain

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Vertex-Fault-Tolerant Cycles Embedding on Enhanced Hypercube Networks

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Acta Mathematicae Applicatae Sinica 2016年第1期32卷 187-198页

作者： Min liu Hong-mei liu Faculty of Mathematics and Statistics Central China Normal University College of Science China Three Gorges University

In this paper,we focus on the vertex-fault-tolerant cycles embedding on enhanced hypercube,which is an attractive variant of hypercube and is obtained by adding some complementary edges from *** Fv be the set of faulty vertices in the n-dimensional enhanced hypercube Qn,k（1 ≤ k≤n- 1）.When ｜F_v｜ = 2,we showed that Qn,k-Fv contains a fault-free cycle of every even length from 4 to 2^n- 4 where n（n ≥ 3） and fc have the same parity;and contains a fault-free cycle of every even length from 4 to 2^n- 4,simultaneously,contains a cycle of every odd length from n — fc ＋ 2 to 2^n-3 where n（≥ 3） and fc have the different ***,when ｜Fv｜= fv ≤ n- 2,we proof that there exists the longest fault-free cycle,which is of even length 2^n- 2fv whether n（n 〉 3） and fe have the same parity or not;and there exists the longest fault-free cycle,which is of odd length 2^n-2fv- 1 in Qn,k — Fv where n（≥ 3） and fc have the different parity.

关键词： enhanced hypercube vertex-fault-tolerant embedding cycles

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Uniform Invariance Principle of Discontinuous Systems with Parameter Variation

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Acta Mathematicae Applicatae Sinica 2013年第4期29卷 717-724页

作者： ju-mei WEI Rui MA Xiao-wu MU School of Mathematics and Statistics Zhengzhou University

An extension of the invariance principle for a class of discontinuous righthand sides systems with parameter variation in the Filippov sense is proposed. This extension allows the derivative of an auxiliary function V, also called a Lyapunov-like function, along the solutions of the discontinuous system to be positive on some sets. The uniform estimates of attractors and basin of attractions with respect to parameters are also obtained. To this end, we use locally Lipschitz continuous and regular Lyapunov functions, as well as Filippov theory. The obtained results settled in the general context of differential inclusions, and through a uniform version of the LaSalle invariance principle. An illustrative example shows the potential of the theoretical results in providing information on the asymptotic behavior of discontinuous systems.

关键词： invariance principle Lyapunov functions discontinuous systems

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Heat Capacity and Thermodynamic Properties of Crystalline 2-Chloro- N, N-dimethylnicotinamide

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Chinese Journal of Chemistry 2005年第11期23卷 1490-1494页

作者： SUN, Xiao-Hong liu, Yuan-Fa TAN, Zhi-Cheng JI, Peng-ju WANG, mei-Han College of Chemical Engineering Chemical Research Institute Northwest University Xi'an Shaanxi 710069 China Department of Chemistry Northwest University Xi'an Shaanxi 710069 China Thermochemistry Laboratory Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China

Low-temperature heat capacities of 2-chloro-N,N-dimethylnicotinamide were precisely measured with a high-precision automated adiabatic calorimeter over the temperature range from 82 K to 380 K. The compound was observed to melt at （342.15±0.04） K. The molar enthalpy AfusionHm, and entropy of fusion, △fusionSm, as well as the chemical purity of the compound were determined to be （21387±7） J·mol^-1, （62.51±0.01） J·mol^-1·K^-1, （0.9946±0.0005） mass fraction, respectively. The extrapolated melting temperature for the pure compound obtained from fractional melting experiments was （342.25±0.024） K. The thermodynamic function data relative to the reference temperature 298.15 K were calculated based on the heat capacity measurements in the temperature range from 82 to 325 K. The thermal behavior of the compound was also investigated by different scanning calorimetry.

关键词： 2-chloro-N,N-dimethylnicotinamide heat capacity adiabatic calorimetry

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Influential factors and control of water inrush in a coal seam as the main aquifer

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International Journal of Mining Science and Technology 2018年第2期28卷 187-193页

作者： Gao Rui Yan Hao ju Feng mei Xianchen Wang Xiulin Key Laboratory of Deep Coal Resource Mining Ministry of Education School of Mines China University of Mining and Technology State Key Laboratory for Geomechanics & Deep Underground Engineering China University of Mining and Technology Huadian Coal Industry Group Co. Ltd.

In this paper, a combination of field measurement, theoretical analysis and numerical simulation were used to study the main control factors of coal mine water inrush in a main aquifer coal seam and its control scheme. On the basis of revealing and analyzing the coal seam as the main aquifer in western coal mine of Xiao Jihan coal mine, the simulation software of PHASE-2D was applied to analyze the water inflow under different influencing factors. The results showed that water inflow increases logarithmically with the coal seam thickness, increases as a power function with the permeability coefficient of the coal seam, and increases linearly with the coal seam burial depth and the head pressure; The evaluation model for the factors of coal seam water inrush was gained by using nonlinear regression analysis with SPSS. The mine water inrush risk evaluation partition within the scope of the mining field was obtained,through the engineering application in Xiao Jihan coal mine. To ensure the safe and efficient production of the mine, we studied the coal mine water disaster prevention and control measures of a main aquifer coal seam in aspects of roadway driving and coal seam mining.

关键词： Coal seam Main aquifer Water inrush Influential factors Control

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Efficient and selective recovery of Ni, Cu, and Co from low-nickel matte via a hydrometallurgical process

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International Journal of Minerals,Metallurgy and Materials 2017年第3期24卷 249-256页

作者： Guang-ju Chen Jian-ming Gao mei Zhang Min Guo School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

Low-nickel matte was intensively characterized, and Ni, Cu, and Co were determined to exist mainly as (Fe,Ni)9S8and FeNi3, Cu5FeS4, and (Fe,Ni)9S8and Fe3O4(in isomorphic form), respectively. The efficient and selective extraction of Ni, Cu, and Co from the low-nickel matte in an (NH4)2S2O8/NH3·H2O solution system was studied. The effects of (NH4)2S2O8and NH3·H2O concentrations, leaching time, and leaching temperature on the metal extraction efficiency were systematically investigated. During the oxidative ammonia leaching process, the metal extraction efficiencies of Ni 81.07%, Cu 93.81%, and Co 71.74% were obtained under the optimal conditions. The relatively low leaching efficiency of Ni was mainly ascribed to NiFe alloy deactivation in ammonia solution. By introducing an acid pre-leaching process into the oxidative ammonia leaching process, we achieved the high extraction efficiencies of 98.03%, 99.13%, and 85.60% for the valuable metals Ni, Cu, and Co, respectively, from the low-nickel matte. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.

关键词： Ammonia Cobalt Copper Efficiency Hydrometallurgy Leaching Nickel

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The Infiuence of Velocity-dependent Correction Factor on Proton Decay Reactions in Massive White Dwarfs

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Research in Astronomy and Astrophysics 2024年第3期24卷 169-179页

作者： Jing-Jing liu Dong-mei liu College of Science Hainan Tropical Ocean UniversitySanya 572022China

Twenty-five typical massive white dwarfs(WDs)are selected and the proton decay reaction catalyzed by magnetic monopoles(MMs)for these WDs is discussed.A velocity-dependent correction factor strongly affects the *** find that a strong suppression controls the monopole catalysis of nucleon decay by the correction *** maximum number of MMs is captured and the luminosity can be 2.235×10^(21)and 1.7859×10^(32)erg s^(-1)(e.g.,for the O+Ne core mass WD J055631.17+130639.78).The luminosities of most massive WDs agree well with the observations at relatively low temperatures(e.g.,T_(6)=0.1),but can be three and two orders of magnitude higher than those of the observations for model(Ⅰ)and(Ⅱ)at relatively high temperatures(e.g.,T_(6)=10),*** luminosities of model(Ⅰ)are about one order of magnitude higher than those of model(Ⅱ).Since we consider the effect of the number of MMs captured on the mass–radius relation and the suppression of the proton decay by the correction factor,the study by model(Ⅱ)may be an improved estimation.

关键词： astroparticle physics-nuclear reactions-nucleosynthesis-abundances-(stars) white dwarfs

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Micromechanical properties of poly(N-isopropylacrylamide)hydrogel microspheres determined using a simple method

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Particuology 2015年第2期13卷 164-172页

作者： mei Yuan Xiaojie ju Rui Xie Wei Wang Liangyin Chu School of Chemical Engineering Sichuan University

Temperature-responsive poly（N-isopropylacrylamide）（PNIPAM） hydrogel microspheres have attracted extensive attention because of their promising diverse biomedical applications. A quantitative understanding of the micromechanical properties of these microspheres is essential for their practical application. Here, we report a simple method for the characterization of the elastic properties of PNIPAM hydrogel microspheres. The results show that PNIPAM hydrogel microspheres exhibit elastic deformation and the obtained force-deformation experimental data fits the Hertz theory well. The moduli of elasticity of the PNIPAM hydrogel microspheres prepared under different conditions were systematically investigated in this work for the first time. The PN1PAM hydrogel microsphere composition significantly affects their micromechanical properties and their temperature sensitivity behavior. PNIPAM hydrogel microspheres with a larger equilibrium volume change have a lower modulus of elasticity. The modulus of elasticity of the PNIPAM hydrogel microspheres at body temperature （37 ℃, above the lower critical solution temperature （LCST） of PNIPAM） is much higher than that at room temperature （25 ℃, below the LCST of PNIPAM） because ofthermo-induced volume shrinkage and an increase in stiffness. These results provide valuable guidance for the design of smart materials for practical biomedical applications. Moreover, the simple microcompression method presented here also provides a versatile way to investigate the micromechanical properties of microscopic biomedical materials.

关键词： Poly(N-isopropylacrylamide) Microspheres Micromechanical properties Modulus of elasticity Temperature-responsive volume change Lower critical solution temperature

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Iron group nuclei electron capture in super-Chandrasekhar superstrong magnetic white dwarfs

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Research in Astronomy and Astrophysics 2021年第11期21卷 153-164页

作者： Jing-Jing liu Dong-mei liu College of Science Hainan Tropical Ocean UniversitySanya 572022China

Using the theory of relativistic mean-field effective interactions,the influences of superstrong magnetic fields(SMFs)on electron Fermi energy,binding energy per nucleus and single-particle level structure are discussed in super-Chandrasekhar magnetic white *** on the relativistical SMFs theory model of Potekhin et al.,the electron chemical potential is corrected in SMFs,and the electron capture(EC)of iron group nuclei is investigated by using the Shell-Model Monte Carlo method and Random Phase Approximation *** EC rates can increase by more than three orders of magnitude due to the increase of the electron Fermi energy and the change of single-particle level structure by ***,the EC rates can decrease by more than four orders of magnitude due to increase of the nuclei binding energy by *** compare our results with those of FFNs(Fuller et al.),AUFDs(Aufderheide et al.)and Nabi(Nabi et al.).Our rates are higher by about four orders of magnitude than those of FFN,AUFD and Nabi due to *** study may have important reference value for subsequent studies of the instability,mass radius relationship,and thermal and magnetic evolution of super-Chandrasekhar magnetic white dwarfs.

关键词： nuclear reactions,nucleosynthesis,abundances stars:white dwarfs

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