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以新质生产力引领现代化大农业发展

改革 2024年第5期 1-11页

作者：魏后凯吴广昊中国社会科学院农村发展研究所中国社会科学院大学应用经济学院

现代化大农业是以系统、全局的大农业观为指导,对传统小农经济进行现代化改造的先进农业发展模式,具有多维生产空间、多种农业功能和多元实践模式,其基本特征是以现代化大产业为核心架构,以绿色高效为根本属性,以强带动能力为突出作用... 详细信息

现代化大农业是以系统、全局的大农业观为指导,对传统小农经济进行现代化改造的先进农业发展模式,具有多维生产空间、多种农业功能和多元实践模式,其基本特征是以现代化大产业为核心架构,以绿色高效为根本属性,以强带动能力为突出作用。发展现代化大农业是加快农业农村现代化的主攻方向,也是加快建设农业强国的重要途径。新质生产力对现代化大农业发展具有引领作用,为现代化大农业发展明确了着力点,提供了内在支撑,开辟了新起点、新机遇和新路径。实践中,新质生产力能够有效拓展农业生产空间及功能,弥合农业科技短板,推动农业形成大产业格局,促进农业绿色低碳转型,由此引领、支撑并推动现代化大农业发展。以新质生产力引领现代化大农业发展,需要加快构建与之相适应的现代农业科技创新体系和现代化大农业产业体系,强化与之相配套的现代化大农业基础设施建设和新型农业人才队伍建设,推动与之相协调的体制机制适应性变革。

关键词：现代化大农业新质生产力农业农村现代化高质量发展

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Preparation of Laser Cladding Coating Undercooling Cu-based Alloy and Co on Non-equilibrium Solidification Structure

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Journal of Wuhan University of Technology(Materials Science) 2024年第2期39卷 463-472页

作者：田徐铭 CAO Shichao hou kai hou Xiaopeng WANG Hongfu 张煜 Department of Outpatient Xinzhou People’s HospitalXinzhou 034099China School of Mechanical Engineering North University of ChinaTaiyuan 030051China Department of Neurosurgery Xinzhou People’s HospitalXinzhou 034099China Department of Orthopedics Xinzhou People’s HospitalXinzhou 034099China

The effect of the gradient content of Co element on the solidification process of Cu-based alloy under deep under cooling conditions was *** non-equilibrium solidification structure of the under cooled alloy samples were *** is found that the rapidly solidified alloy has undergone twice grain refinement during the undercooling *** and significance of the maximum undercooling refinement structure of Cu60Ni35Co5 at T=253 K were ***-density defects were observed,such as dislocations,stacking faults networks,and twinning *** standard FCC diffraction pattern represents that it is still a single-phase *** on the metallographic diagram,EBSD and TEM data analysis,it is illustrated that the occurrence of grain refinement under high undercooling is due to stress induced *** addition,the laser cladding technology is used to coat Co-based alloy(Stellite12) coating on 304 stainless steel substrate;the microstructure of the coating cross-section was *** was found that the microstructure of the cross-section is presented as columnar crystals,planar crystals,and disordered growth direction,so that the coating has better hardness and wear *** electrochemical corrosion of the substrate and coating,it can be seen that the Co and Cr elements present in the coating are more likely to form a dense passivation film,which improved the corrosion resistance of the coating.

关键词： non-equilibrium solidification structure undercooling recrystallization laser cladding coating

Strong light–matter interactions based on excitons and the abnormal all-dielectric anapole mode with both large field enhancement and low loss

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Photonics Research 2024年第4期12卷 854-864页

作者： YAN-HUI DENG YU-wei LU hou-JIAO ZHANG ZHONG-HONG SHI ZHANG-kai Zhou XUE-HUA WANG State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510275China Quantum Science Center of Guangdong–Hong Kong–Macao Greater Bay Area(Guangdong) Shenzhen 518045China

The room temperature strong coupling between the photonic modes of micro/nanocavities and quantum emitters(QEs) can bring about promising advantages for fundamental and applied *** the electric fields(EFs) by using plasmonic modes and reducing their losses by applying dielectric nanocavities are widely employed approaches to achieve room temperature strong ***,ideal photonic modes with both large EFs and low loss have been ***,we propose the abnormal anapole mode (AAM),showing both a strong EF enhancement of~70-fold (comparable to plasmonic modes) and a low loss of 34 meV,which is much smaller than previous records of isolated all-dielectric *** realizing strong coupling,we further show that by replacing the normal anapole mode with the AAM,the lasing threshold of the AAM-coupled QEs can be reduced by one order of magnitude,implying a vital step toward on-chip integration of nanophotonic devices.

关键词： dielectric mode coupling

Theoretical study on the stability of nanobubbles and its verification in molecular dynamics simulation

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Particuology 2024年第4期87卷 99-105页

作者： Sheng Mi Chaofeng hou wei Ge School of Chemical Engineering and Technology Tianjin UniversityTianjin300072China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing.100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

The stability of vapor nanobubbles in bulk liquid was investigated theoretically and the critical bubble size was derived from macroscale thermodynamic equations,below which the system destabilizes with sharp drop in *** critical size was quantitatively verified in molecular dynamic simulation using the Lennard-Jones model of argon,where stronger attraction between the molecules at lower density is found to contribute most to the drop of system pressure and,as the Laplace pressure on the curved bubble interface fails to balance the pressure difference across the interface,the bubbles become *** theoretical model could be extended to other systems where reliable equations of state and interfacial tension are available.

关键词： Nanobubble Stability Phase diagram Critical size

Correlation between longitudinal crack occurrence and mold heat transfer in continuous casting based on process data mining

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Journal of Iron and Steel Research(International) 2024年第5期31卷 1139-1152页

作者： Zhi-qiang Peng Zi-bing hou kai Yi Kun-hui Guo Dong-wei Guo Guang-hua Wen College of Materials Science and Engineering Chongqing UniversityChongqing400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing400044China

The correlation between the longitudinal crack occurrence and integrated heat transfer of the mold with data mining methods was ***,three kinds of support vector machine models based on principal component analysis with different input features were established to explore the effect of integrated heat transfer on the accuracy of the prediction model for the longitudinal *** results show that the accuracy was improved while features including mean and standard deviation of integrated heat transfer were ***,the difference in integrated heat transfer between defect and normal samples under the same process parameters was quantitatively *** with normal samples,the temperature difference of cooling water for defect samples decreased by 0.65%,and the temperature difference fluctuation increased by 31.1%.Finally,the literature data were used to provide support for the quantitative correlation according to defect formation mechanism.A new criterion for the prediction of longitudinal crack and a discovering method for correlation between product quality and process parameters in the manufacturing industry have been provided.

关键词： Continuous casting slab Longitudinal surface crack Heat transfer Data mining Quantitative correlation

A novel profile modification HPF-Co gel satisfied with fractured low permeability reservoirs in high temperature and high salinity

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Petroleum Science 2024年第1期21卷 683-693页

作者： Ya-kai Li Ji-Rui hou wei-Peng Wu Ming Qu Tuo Liang wei-Xin Zhong Yu-Chen Wen Hai-Tong Sun Yi-Nuo Pan China University of Petroleum Beijing Beijing102249China PetroChina Tarim Oilfield Company Korla 841000XinjiangChina Key Laboratory of Improving Oil and Gas Recovery of Ministry of Education Northeast Petroleum University Daqing 163318HeilongjiangChina Xi'an Shiyou University Xi'an 710065ShaanxiChina Northwest Oilfield Company SINOPECUrumqi 830011XinjiangChina

Conformance control and water plugging are a widely used EOR method in mature ***,majority of conformance control and water plugging agents are unavoidable dehydrated situation in high-temperature and high-salinity low permeability ***,a novel conformance control system HPF-Co gel,based on high-temperature stabilizer(CoCl_(2)·H_(2)O,CCH)is *** HPF-Co bulk gel has better performances with high temperature(120℃)and high salinity(1×10^(5)mg/L).According to Sydansk coding system,the gel strength of HPF-Co with CCH is increased to code *** dehydration rate of HPF-Co gel is 32.0%after aging for 150 d at 120℃,showing excellent thermal *** rheological properties of HPF gel and HPF-Co gel are also *** results show that the storage modulus(G′)of HPF-Co gel is always greater than that of HPF *** effect of CCH on the microstructure of the gel is *** results show that the HPF-Co gel with CCH has a denser gel network,and the diameter of the three-dimensional network skeleton is 1.5-3.5μ*** 90 d of aging,HPF-Co gel still has a good three-dimensional *** spectroscopy results show that CCH forms coordination bonds with N and O atoms in the gel amide group,which can suppress the vibration of cross-linked sites and improve the stability at high *** core plugging test determines the optimized polymer gel injection strategy and injection velocity with HPF-Co bulk gel system,plugging rate exceeding 98%.Moreover,the results of subsequent waterflooding recovery can be improved by 17%.

关键词： Low permeability reservoir High-temperature resistant gel Complexation reaction Polymer gel injection strategy Plugging rate Enhanced oil recovery

First Digit Distributions of Gamma-Ray Bursts

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Research in Astronomy and Astrophysics 2024年第5期24卷 70-75页

作者： hou-Yu Lai Jun-Jie wei Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China

The occurrence of the first significant digits from real world sources is usually not equally distributed,but is consistent with a logarithmic distribution instead,known as Benford’s *** this work,we perform a comprehensive investigation on the first digit distributions of the duration,fluence,and energy flux of gamma-ray bursts (GRBs) for the first *** a complete GRB sample detected by the Fermi satellite,we find that the first digits of the duration and fluence adhere to Benford’s ***,the energy flux shows a significant departure from this law,which may be due to the fact that a considerable part of the energy flux measurements is restricted by lack of spectral *** on the conventional duration classification scheme,we also check if the durations and fluences of long and short GRBs (with duration T_(90)>2 s and T_(90)≤2 s,respectively) obey Benford’s *** find that the fluences of both long and short GRBs still agree with the Benford distribution,but their durations do not follow Benford’s *** results hint that the long–short GRB classification scheme does not directly represent the intrinsic physical classification scheme.

关键词： (stars:)gamma-ray burst general-methods statistical-astronomical databases miscellaneous

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构建人与自然和谐共生的城镇化格局

城市问题 2023年第1期 7-8页

作者：魏后凯中国社会科学院农村发展研究所中国城市经济学会

城镇化速度可以划分为低速、中速、中高速、高速以及超高速等五个等级,城镇化水平增速在1.4个百分点以上的为超高速增长,增速在1—1.4个百分点的为高速增长。1996—2017年,中国的城镇化率年均提升1.42个百分点,处于超高速的城镇化进程... 详细信息

城镇化速度可以划分为低速、中速、中高速、高速以及超高速等五个等级,城镇化水平增速在1.4个百分点以上的为超高速增长,增速在1—1.4个百分点的为高速增长。1996—2017年,中国的城镇化率年均提升1.42个百分点,处于超高速的城镇化进程时期。这种城镇化超高速发展会对资源环境产生巨大的压力,导致资源消耗高、生态遭受破坏、环境遭到污染等一系列问题。2021年,中国城镇化率达到64.72%,速度仅提高了0.83个百分点,呈现明显的减缓趋势,说明中国超高速城镇化时代已经结束,城镇化逐步转向高质量发展阶段。

关键词：超高速发展城镇化速度城镇化率城镇化水平资源消耗城镇化格局高质量发展

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农业强国的内涵特征、建设基础与推进策略

改革 2022年第12期 1-11页

作者：魏后凯崔凯中国社会科学院农村发展研究所中国社会科学院大学

农业强国以农业供给保障能力强、农业竞争力强、农业科技创新能力强、农业可持续发展能力强和农业发展水平高为特征,表明特定时期一国农业发展达到国际领先水平。为实现农业由大到强的转变,中国围绕粮食安全、资金投入、科技创新、产业... 详细信息

农业强国以农业供给保障能力强、农业竞争力强、农业科技创新能力强、农业可持续发展能力强和农业发展水平高为特征,表明特定时期一国农业发展达到国际领先水平。为实现农业由大到强的转变,中国围绕粮食安全、资金投入、科技创新、产业发展、经营服务、生态保护、试点改革等领域采取了一系列有效举措,粮食生产能力、农业增长动力、产业带动能力、资源利用能力等不断增强,目前已经具备加快建设农业强国的基础条件。突破建设农业强国面临的约束,补齐农业强国建设短板,应推进四大体系建设,包括确保稳产优供基础的能力体系建设、彰显农业竞争优势的产业体系建设、基于双轮驱动与可持续发展的支撑体系建设、面向社会主义现代化强国战略的政策体系建设,确保到21世纪中叶农业强国如期建成。

关键词：农业强国农业现代化农业竞争力