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Pilot Test for Nitrogen Foam Flooding in Low Permeability Reservoir

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Energy Engineering 2023年第3期120卷 763-774页

作者： Xinyu Zhou Jia Huang yuchen qian Wenli Luo Lisha Qi Jie Wang Zhibin Jiang Hao Kang State Key Laboratory of Enhanced Oil Recovery CNPCBeijing100083China Research Institute of Petroleum Exploration and Development CNPCBeijing100083China Research Institute of Petroleum Exploration and Development Xinjiang Oilfield CompanyKaramay834000China Hebei Normal University Shijiazhuang050024China

Due to the characteristics of reservoir formation,the producing level of low permeability reservoir is relatively very *** is hard to obtain high recovery through conventional development *** the tight matrix,complex fracture system,low production level of producers,and low recovery factor ofMblock in Xinjiang oilfield,it is selected for on-site pilot test of nitrogen foam *** flooding scheme is made and the test results are evaluated respectively both for producers and *** pressure index,filling degree,and fluid injection profile are found to be all improved in injectors after injection of nitrogen *** oil production,water cut and liquid production file are also improved in most of the producers,with the natural decline rate in the test area become *** show that nitrogen foam flooding technology can be good technical storage for enhanced oil recovery in low permeability reservoir.

关键词： Fluid production profile nitrogen foam low permeability pilot test

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数据整合征供一体化土地批后监管模型设计

地理空间信息 2024年第3期22卷 110-114页

作者：冯善元胡检平方玲刘丹里钱宇晨张红霞胡斌湖北省自然资源厅征地事务中心(省重点项目办) 湖北武汉430070

为解决受数据源异构性影响征供一体化土地批后监管效率较低的问题,提出基于数据整合的征供一体化土地批后监管模型设计。根据征供一体化土地批后监管的流程与内容,对监管信息进行分类,由此采集土地批后权限信息。根据数据类型、结构和语... 详细信息

为解决受数据源异构性影响征供一体化土地批后监管效率较低的问题,提出基于数据整合的征供一体化土地批后监管模型设计。根据征供一体化土地批后监管的流程与内容,对监管信息进行分类,由此采集土地批后权限信息。根据数据类型、结构和语义,利用数据整合技术对异构数据源进行集成与整合,并结合映射转换规则设计模型的智能合约。通过求取监管数据的贡献度,构建监管模型,以实现土地监管信息的数据上链,完成土地批后监管。实验结果表明,该方法能有效提高土地批后监管数据的管理效率。

关键词：数据整合征供土地土地批后管理监管模型

Perpendicularly assembled oriented electrospinning nanofibers based piezoresistive pressure sensor with wide measurement range

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Nano Research 2024年第7期17卷 6493-6501页

作者： Xiaoxue Bi Zhigang Duan Xiaojuan Hou Shuo qian Mengjiao Yuan Jiajun Hu Jie Zhang yuchen Lu Yanli Liu Jian He Zhiling Peng Xiujian Chou School of Mechanical and Electrical Engineering North University of ChinaTaiyuan 030051China Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China School of Software North University of ChinaTaiyuan 030051China School of Information and Communication Engineering North University of ChinaTaiyuan 030051China

With the rapid development of wearable electronics,flexible pressure sensors have attracted wide attention in human–computer interaction and intelligent ***,it is a challenge to achieve a sensor with high sensitivity,wide measurement range,and wearing ***,we develop an oriented electrospinning thermoplastic polyurethane/polyacrylonitrile(TPU/PAN)nanofibers(OETPN)based piezoresistive pressure sensor(PONPS)in which the active layer and the electrode are assembled *** interdigital electrode is fabricated by spraying silver nanowires(AgNWs)on the OETPN through a mask *** active layer is composed of OETPN coated with MXene,encapsulated on the electrode by polyurethane(PU)*** porous structure of nanofibers membrane broadens the measurement range of the *** oriented nanofibers as active layer can improve the sensitivity in low pressure,because oriented nanofibers without interweaving nanofibers are more compressible than disordered *** prepared using the spraying method creates nanoscale microstructure and increases *** perpendicular assembly has greater response between the active layer and the electrode than the parallel assembly to improve the *** sensor exhibits high sensitivity(6.71 kPa^(−1),0.02–2 kPa)and wide measurement range(0.02–700 kPa).The sensor can detect weak signals such as radial artery.A pressure array constructed precisely represents the distribution of *** intelligent throat is created by combining machine learning algorithms with the *** can detect and recognize subtle throat vibrations while speaking,achieving recognition accuracy up to 100%using support vector machine(SVM)for five words with different *** fabricated sensor shows promising prospects in personal healthcare and intelligent robots.

关键词： oriented nanofibers perpendicular assembly parallel assembly intelligent throat machine learning algorithms

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雷击环境下延展金属箔电磁屏蔽特性

高电压技术 2022年第10期48卷 4189-4195页

作者：钱宇琛卢翔周显达中国民航大学航空工程学院天津300300

延展金属箔目前常用于航空器复合材料层压板的雷电防护。为探究雷击条件下延展金属网箔的电磁屏蔽特性并对其优化设计,建立了延展金属箔等效模型并优化屏蔽效能理论公式,通过仿真计算和文献对比验证了等效模型的准确性,然后通过仿真分... 详细信息

延展金属箔目前常用于航空器复合材料层压板的雷电防护。为探究雷击条件下延展金属网箔的电磁屏蔽特性并对其优化设计,建立了延展金属箔等效模型并优化屏蔽效能理论公式,通过仿真计算和文献对比验证了等效模型的准确性,然后通过仿真分析了延展金属箔屏蔽效能的影响因素,同时模拟了含延展金属箔防护的复合材料飞机受雷击后内部线缆瞬态感应电流。分析表明:延展金属箔可以有效提供雷击间接效应防护,其屏蔽效能随网箔密度增大而增大、受绝缘基质电导率和厚度影响较小;当金属箔线宽达到0.1 mm以上有较好的屏蔽效果,延展金属箔呈各向异性且其长节距与航空器表面电流流动方向一致时防护效果最佳。

关键词：延展金属箔雷击间接效应屏蔽效能各向异性复合材料等效模型感应电流

Enhancement of CH_(3)CO^(*) adsorption by editing d-orbital states of Pd to boost C–C bond cleavage of ethanol eletrooxidation

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Science China Chemistry 2024年第2期67卷 696-704页

作者： yuchen Qin Fengqi Wang Pei Liu Jinyu Ye qian Wang Yao Wang Guangce Jiang Lijie Liu Pengfang Zhang Xiaobiao Liu Xin Zheng Yunlai Ren Junjun Li Zhicheng Zhang College of Sciences Henan Agricultural UniversityZhengzhou450000China Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin University&Collaborative Innovation Center of Chemical Science and EngineeringTianjin300072China College of Chemistry and Chemical Engineering Xiamen UniversityXiamen361005China Department of Analysis Sinopec Engineering Group Luoyang R&D Center of TechnologyLuoyang471000China School of Chemical and Material Engineering Jiangnan UniversityWuxi214211China Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology Liaocheng UniversityLiaocheng252000China

Improving the complete ethanol electrooxidation on Pd-based catalysts in alkaline media has drawn widely attention due to the high mass energy ***,the weak adsorption energy of CH_(3)CO^(*) on Pd restricts the C–C bond *** by the molecular orbital theory,we proposed the d-state-editing strategy to construct more unoccupied d-states of Pd for the enhanced interaction with CH_(3)CO^(*) to break C–C *** expected,the reduced number of e_g electrons and more unoccupied d-states of Pd successfully formed on as-prepared porous Rh Au–Pd Cu nanosheets(PNSs).Theoretical calculations show that the optimized d-states of Rh Au–Pd Cu PNS can effectively improve the adsorption of CH_(3)CO^(*) and drastically reduce the energy barrier of C–C bond cleavage,thus boosting the complete oxidation of *** charge ratio of C_1 pathway on Rh Au–Pd Cu PNSs is 51.5%,more than 2 times higher than that of Pd *** finding provides an innovative perspective for the design of highly-efficient noble-based electrocatalysts.

关键词： C–C bond cleavage CH_(3)CO^(*)adsorption unoccupied d-states ethanol oxidation reaction RhAu–PdCu porous nanosheets

Experimental study of CO_(2) storage in water-flooded oilfields

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Petroleum Research 2017年第4期2卷 378-382页

作者： Zubo Zhang Xu Chen yuchen qian Qingjie Liu Weifeng Lv Manli Luo Xiliang Fan State Key Laboratory of Enhanced Oil Recovery PetroChina Research Institute of Petroleum Exploration and DevelopmentBeijing 100083China Department of Polymer Science and Engineering School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China China University of Petroleum Beijing 102249China

CO_(2) is the main source of greenhouse emission,and the environment problem caused by greenhouse effect has drawn worldwide *** most oilfields in China,a method of waterflooding is usually used to enhance oil recovery,which is favorable to carry out CO_(2) injection *** CO_(2) injection in the water-flooded oilfields can not only store CO_(2),but also enhance the oil *** this article,the coreflooding tests with refined oil were conducted to investigate CO_(2) displacement characteristic in watersaturated formation under different injection rate and water-flooded oil reservoir under different formation pressure and oil saturation,then the CO_(2) storage capacity was *** testing result shows that the displacement efficiency increases with the rise of the CO_(2) injection rate,and the CO_(2) injection can enhance the oil recovery about 15%OOIP under the experimental *** injecting CO_(2) after the waterflooding,the CO_(2) storage capacity increases as the rise of the formation *** core-flooding tests also indicate that when the initial oil saturation of reservoir prior CO_(2) injection is higher,the oil recovery will be higher when injecting the same pore volume(PV)of CO_(2),and the CO_(2) storage capacity will be larger.

关键词： reservoir saturation refined

A historical review of hybrid rice breeding

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Journal of Integrative Plant Biology 2024年第3期66卷 532-545页

作者： Xiaoming Zheng Fei Wei Cheng Cheng qian qian State Key Laboratory of Crop Gene Resources and Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China Yazhouwan National Laboratory Sanya City 572024China

The development of germplasm resources and advances in breeding methods have led to steady increases in yield and quality of rice (Oryza sativa L.). Three milestones in the recent history of rice breeding have contributed to these increases: dwarf rice breeding, hybrid rice breeding, and super rice breeding. On the 50th anniversary of the success of three-line hybrid rice,we highlight important scientific discoveries in rice breeding that were made by Chinese scientists and summarize the broader history of the field. We discuss the strategies that could be used in the future to optimize rice breeding further in the hope that China will continue to play a leading role in international rice breeding.

关键词： Chinese experience dwarf breeding hybrid rice breeding super rice breeding

Molecular Mechanism of Rice Necrotic Lesion for Optimized Yield and Disease Resistance

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Rice science 2024年第3期31卷 285-299页

作者： HOU Xinyue WANG Yuping qian qian REN Deyong State Key Laboratory of Rice Biology and Breeding China National Rice Research InstituteHangzhou 310006China State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China Rice Research InstituteSichuan Agricultural UniversityChengdu 611130China

How to balance rice resistance and yield is an important issue in rice *** with mutated necrotic lesion genes often have persistent broad-spectrum resistance,but this broad-spectrum resistance usually comes at the expense of ***,many necrotic lesion mutants in rice have been identified,and these genes are involved in disease resistance *** review provides a detailed introduction to the characteristics,classification,and molecular mechanisms of necrotic lesion ***,we review the molecular regulatory pathways of genes involved in rice disease ***,we summarize the relationship between resistance and yield in rice using newly developed gene editing *** discuss a rational and precise breeding strategy to better utilize molecular design technology for breeding disease-resistant and high-yield rice varieties.

关键词： rice necrotic lesion regulation mechanism high yield high resistance

Localizing vitamin-C through nanoconfinement enables high-rate CO_(2) electrolysis to ethylene

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Science China Materials 2024年第3期67卷 1006-1008页

作者： Zhengyi qian Shaojun Guo School of Materials Science and Engineering Peking UniversityBeijing 100871China

The electrosynthesis of value-added fuels and chemicals from carbon dioxide reduction reaction(CO_(2)RR)is a promising approach for realizing the objectives of carbon neutrality[1].Nevertheless,the current production of desirable multicarbon(C_(2+))chemicals,such as ethylene(C_(2)H_(4)),still encounters challenges related to low selectivity,low current density,and the requirement for high-purity feeding gas[2].

关键词： enable purity dioxide