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Theoretical research on construction quality real-time monitoring and system integration of core rockfill dam

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Science China(Technological Sciences) 2009年第11期52卷 3406-3412页

作者： ZHONG DengHua CUI Bo liu donghai TONG DaWei Department of Hydraulic and Hydroelectric Engineering School of Civil EngineeringTianjin UniversityTianjin 300072China

With the enlargement of core rockfill dam construction scale and the improvement of construction mechanization level, the traditional manual construction quality control method is now difficult to meet the quality and safety demands of modern dam construction, so automatic and real-time dam construction quality monitoring with high-techs is urgently needed. The paper makes theoretical research on construction quality real-time monitoring and system integration of core rockfill dam, proposes implementation method and integrated solution of construction quality real-time monitoring of core rockfill dam construction process, realizes refining, all-whether, entire-process and real-time control and analysis on key links of dam construction, and introduces the application of the construction quality real-time monitoring and system integration technology to a practical core rockfill dam project.

关键词： core rockfill dam construction quality real-time monitoring system integration

Geological Controls on the CBM Productivity of No.15 Coal Seam of Carboniferous–Permian Taiyuan Formation in Southern Qinshui Basin and Prediction for CBM High-yield Potential Regions

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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2310-2332页

作者： ZHANG Zheng QIN Yong ZHUANG Xinguo LI Guoqing liu donghai Key Laboratory of Tectonics and Petroleum Resources China University of GeosciencesMinistry of Education Faculty of Earth Resources China University of Geosciences State Key Laboratory of Water Resource Protection and Utilization in Coal Mining Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and Technology State Key Laboratory of Coal and CBM Co-mining Shanxi Jincheng Anthracite Mining Group Co. Ltd.

Coalbed methane(CBM) resources in No.15 coal seam of Taiyuan Formation account for 55% of the total CBM resources in southern Qinshui Basin(SQB), and have a great production potential. This study aims at investigating the CBM production in No.15 coal seam and its influence factors. Based on a series of laboratory experiments and latest exploration and development data from local coal mines and CBM companies, the spatial characteristics of gas production of No.15 coal seam were analyzed and then the influences of seven factors on the gas productivity of this coal seam were discussed, including coal thickness, burial depth, gas content, ratio of critical desorption pressure to original coal reservoir pressure(RCPOP), porosity, permeability, and hydrogeological condition. The influences of hydrological condition on CBM production were analyzed based on the discussions of four aspects: hydrogeochemistry, roof lithology and its distribution, hydrodynamic field of groundwater, and recharge rate of groundwater. Finally, a three-level analytic hierarchy process(AHP) evaluation model was proposed for predicting the CBM potentials of the No.15 coal seam in the SQB. The best prospective target area for CBM production of the No.15 coal seam is predicted to be in the districts of Panzhuang, Chengzhuang and south of Hudi.

关键词： coalbed methane gas productivity controlling factors production potential Taiyuan Formation southern Qinshui Basin

GEOGRAPHY AND TERRITORIAL PLANNING

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Journal of Geographical Sciences 1992年第1期 29-36页

作者： liu donghai Ma Min Henan Institute of Geography Henan Provincial Academy of Sciences

Territorial planning taking territorial area as its study object,is to make optimum designs of the territorial systems concerned with production,society,and the ecoenvironment within a certain *** exploitation and management as a branch derived from geographical systems belongs to the theoretical category of geographical *** the various theoretical systems of science applied in territorial planning,geographical human-land relation and regional theory is the theoretical basis,and other theories are supplements to improve this theoretical framework in *** thesis discusses the principal distinctions and close linkages between geography and territorial planning,and suggests that a comprehensive geographical science be set up,and the study on regional policy and behavioural geography be improved and strengthened as well.

关键词： geography territorial planning areal system

Co-composting of Chinese milk vetch with rice straw and using the compost as a peat substitute of seeding substrate of vegetables

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International Journal of Agricultural and Biological Engineering 2019年第1期12卷 214-220页

作者： Yunfeng Chen Cheng Hu donghai liu Shuanglai Li Yan Qiao Key Laboratory of Fertilization from Agricultural Wastes Ministry of Agriculture and Rural AffairsWuhan 430064China Institute of Plant Protection and Soil Fertilizer Hubei Academy of Agricultural SciencesWuhan 430064China

Chinese milk vetch(Astragalussinicus L.)is an environment-friendly green manure used for rice with low carbon/nitrogen(C/N)ratio and high *** improve the added values of milk vetch,the feasibility of co-composting of milk vetch with rice straw was *** probability of using the milk vetch-based compost as a peat substitute in seeding substrate of vegetable was further *** changes in physicochemical properties during co-composting of milk vetch and rice straw were evaluated,depending on three treatments:(1)milk vetch alone(MV),(2)co-composting of milk vetch and rice straws with 4:1 ration(w/w)(MV+S)and(3)MV+S with the addition of 3%(w/w)microbial inoculation(MV+S+M).The entire composting durations were 15 d,24 d,and 24 d in MV,MV+S,MV+S+M *** to MV compost,both the MV+S,MV+S+M composts increased the temperature,pH,organic C,total nitrogen(N),total potassium(K)and the germination index(GI)(over 100)during the cooling/mature phase,and decreased total N loss,and generally,the improvements or reductions were greater in the MV+S+M compost than in the MV+S ***,the MV+S+M compost was added at a peat substitute rates of 0%,20%,40%,80%and 100%in a pot experiment to testify the utilization of milk vetch-based compost in *** results showed that the substrate with 40%substitute rate increased the cabbage seeding growth,and that the electrical conductivity was the limiting factor of preventing the substitute rate *** pot experiment demonstrated that the substrate with 40%peat substitute increased the cucumber growth as compared to the substrate without *** conclusion,the co-composting milk vetch with rice straw was feasible and quick,and microbial inoculation accelerated the composting process and improved the compost *** milk vetch-based composts were nutrient-rich and safe,and thus,can replace part of peat in vegetable seeding substrate.

关键词： Chinese milk vetch(Astragalussinicus L.) compost peat seeding substrate

Resistivity response to the porosity and permeability of low rank coal

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International Journal of Mining Science and Technology 2016年第2期26卷 339-344页

作者： Wang Gang Qin Yong Shen Jian Hu Yuanyuan liu donghai Zhao Long School of Resources and Geosciences China University of Mining and Technology Key Lab of CBM Resources and Dynamic Accumulation Process Ministry of Education of China

Laojunmiao coal samples from the eastern Junggar basin were studied to understand the relationship between coal resistivity and the physical parameters of coal reservoirs under high temperatures and ***,we analysed the relationship of coal resistivity to porosity and permeability via heating and pressurization *** results indicated that coal resistivity decreases exponentially with increasing *** the temperature decreases the *** sensitivity of coal resistivity to the confining pressure is worse when the temperature is *** resistivity of dry coal samples was linearly related to φ~*** the temperature decreased the cementation exponent(m).Increasing the confining pressure exponentially decreases the *** the pressure increases the resistivity and porosity for a constant *** the temperature yields a quadratic relationship between the resistivity and permeability for a constant confining *** on the Archie formula,we obtained the coupling relationship between coal resistivity and permeability for Laojunmiao coal samples at different temperatures and confining pressures.

关键词： High temperature and high pressure Low rank coal Resistivity Porosity Permeability

Solution-based Preparation of High Sulfur Content Sulfur/Graphene Cathode Material for Li-S Battery

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Chemical Research in Chinese Universities 2021年第2期37卷 323-327页

作者： ZHANG Chen liu donghai GENG Chuannan HUA Wuxing TANG Quanjun LING Guowei YANG Quan-Hong School of Marine Science and Technology Tianjin UniversityTianjin300072P.R.China Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin300072P.R.China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin300072P.R.China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou350207P.R.China

Practical Li-sulfur batteries require the high sulfur loading cathode to meet the large-capacity power demand of electrical ***,the sulfur content in cathode materials is usually unsatisfactory due to the excessive use of carbon for improving the *** cathode fabrication strategies can hardly realize both high sulfur content and homogeneous sulfur distribution without ***,we designed a cathode material with ultrahigh sulfur content of 88%(mass fraction)by uniformly distributing the water dispersible sulfur nanoparticles on three-dimensionally conductive graphene *** water processable fabrication can maximize the homogeneous contact between sulfur nanoparticles and graphene,improving the utilization of the interconnected conductive *** obtained cathode material showed a capacity of 500 mA·h/g after 500 cycles at 2.0 A/g with an areal loading of 2 mg/*** strategy provides possibility for the mass production of high-performance electrode materials for high-capacity Li-S battery.

关键词： Li-sulfur battery High sulfur loading Polysulfides shuttling

Catalyzing polysulfide conversion by g-C3N4 in a graphene network for long-life lithium-sulfur batteries

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Nano Research 2018年第6期11卷 3480-3489页

作者： Meng Wang Qinghua Liang Junwei Han Ying Tao donghai liu Chen Zhang Wei Lv Quan-Hong Yang Nanoyang Group School of Chemical Engineering and Technology Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin University Tianjin 300072 China Engineering Laboratory for Functionalized Carbon Materials Shenzhen Key Laboratory for Graphene-based Materials Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China School of Marine Science and Technology Tianjin University Tianjin 300072 China

The practical application of lithium-sulfur batteries with a high energy density has been plagued by the poor cycling stability of the sulfur cathode, which is a result of the insulating nature of sulfur and the dissolution of polysulfides. Much work has been done to construct nanostructured or doped carbon as a porous or polar host for promising sulfur cathodes, although restricting the polysulfide shuttle effect by improving the redox reaction kinetics is more attractive. Herein, we present a well-designed strategy by introducing graphitic carbon nitride （g-C3N4） into a three-dimensional hierarchical porous graphene assembly to achieve a synergistic combination of confinement and catalyzation of polysulfides. The porous g-CBN4 nanosheets in situ formed inside the graphene network afford a highly accessible surface to catalyze the transformation of polysulfides, and the hierarchical porous graphene-assembled carbon can function as a conductive network and provide appropriate space for g-C3N4 catalysis in the sulfur cathode. Thus, this hybrid can effectively improve sulfur utilization and block the dissolution of polysulfides, achieving excellent cycling performance for sulfur cathodes in lithium-sulfur batteries.

关键词： lithium-sulfur batteries lithium polysulfide graphitic carbon nitride(g-C3N4) graphene catalytic conversion

Intelligent compaction theory of high roller compacted concrete dam

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Engineering Sciences 2012年第5期10卷 58-64页

作者： liu donghai State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300072 China

The concept and realization process of intelligent compaction for the construction of high roller compacted concrete dam were presented, as well as the theory of monitoring and intelligent feedback control. Based on the real-time analysis of the compaction index, a multiple regression model of the dam compactness was established and a realime estimation method of compaction quality for the entire work area of roller compacted concrete dam was proposed finally. The adaptive adjustment of the roiling process parameters was achieved, with the speed, the exciting force, the roller pass and the compaction thickness meeting the standards during the whole construction process. As a result, the compaction quality and construction efficiency can be improved. The research provides a new way for the construction quality control of roller compacted concrete dam.

关键词： roller compacted concrete ( RCC ) dam quality control intelligent compaction real-time monitoring real-time quality estimation

Spatially Interlinked Graphene with Uniformly Loaded Sulfur for High Performance Li-S Batteries

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Chinese Journal of Chemistry 2016年第1期34卷 41-45页

作者： donghai liu Chen Zhang Xiaohui Lv Xiaoyu Zheng Lei Zhang Linjie Zhi Quan-Hong Yang Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 China National Center for Nanoscience and Technology Beijing 100190 China

Lithium-sulfur （Li-S） batteries have drawn extensive attentions due to their high energy density, environmental friendliness and low cost. In this study, three-dimensional （3D） graphene/S hybrid （G/S） is prepared by a one-pot hydrothermal method together with redox reaction between S-based compound and graphene oxide （GO）. G/S has a three dimensional porous structure, where graphene is interconnected with each other forming a 3D conductive network. It demonstrates that the pore structure of G/S can be well controlled by optimizing the drying method of the 3D graphene-based materials. Freeze drying and evaporation-induced drying can induce different density and pore structure of G/S. Electrochemical tests illustrate that the resulting hybrid can deliver a specific capacity of 891 mAh·g^-1 and 575 mAh·g^-1 for the 1^st and 100^th cycle at a current density of 500 mAh·g^-1 .

关键词： Li-S battery graphene three-dimensional graphene/S hybrid different drying methods