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多层网络视角下全域土地综合整治多元主体协同治理研究

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中国土地科学 2024年第8期38卷 72-84页

作者：李秋芳汪文雄刘雅琴崔永正刘燕华中农业大学公共管理学院湖北武汉430070

研究目的:借助协同治理理论认识全域土地综合整治多元主体协同治理的底层逻辑,从多层网络视角探究全域土地综合整治多元主体协同治理的形成机制,为助力全域土地综合整治高质量发展提供理论和实践借鉴。研究方法:理论分析法,社会网络分析... 详细信息

研究目的:借助协同治理理论认识全域土地综合整治多元主体协同治理的底层逻辑,从多层网络视角探究全域土地综合整治多元主体协同治理的形成机制,为助力全域土地综合整治高质量发展提供理论和实践借鉴。研究方法:理论分析法,社会网络分析法,多层指数随机图模型。研究结果:(1)政府主体的职能多样性和职能异质性对政府协同治理具有促进作用,但不排斥职能相似性的政府主体间建立协同关系;(2)非政府主体的整治任务多样性和异质性对非政府协同治理具有阻碍作用,整治任务相似性对非政府协同治理具有促进作用;(3)政府协同治理与非政府协同治理之间具有相互促进作用,关系依赖对与多元主体建立新的协同治理关系具有阻碍作用。研究结论:多元主体协同治理是助推全域土地综合整治的有效治理创新,需要针对不同主体的职能特征、任务特征及主体间关系完善多元主体协同治理机制。

关键词：全域土地综合整治多元主体协同治理多层网络多层指数随机图模型

Inclusions modification by rare earth in steel and the resulting properties: A review

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Journal of Rare Earths 2024年第3期42卷 431-445,I0001页

作者： Xiaoqiang wang Zhiwei Wu Bing Li wenxiong Chen Jun Zhang Jian Mao College of Materials Science and Engineering Sichuan UniversityChengdu610065China Chengdu Advanced Metal Materials Industry Technology Research Institute Co. Ltd.Chengdu610303China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan114009China

Rare earth(RE) elements are excellent modifiers for non-metallic inclusions that inevitably appear in steel and affect steel properties. This paper reviews the research status of inclusions modification by RE elements and the changes it cause on steel properties. First, the inclusion changes caused by RE modification are described. Generally, after adding pure RE, the main evolution of inclusions occurs as M →M + RE-Al-O → RE-Al-O + RE_(2)O_(2)S → RE_(2)O_(2)S + RE—S/RE_(2)O_(2)S + RE-O with an increase in the RE content(M represents the inclusions before RE addition). The type of final inclusion obtained after RE modification is related to the relative contents of S and O in the steel. Moreover, fine, regular, and uniformly distributed inclusions can be obtained with appropriate RE addition. However, the effectiveness of inclusions modification by adding both RE and non-RE elements is closely related to the order of their addition. Second, the applications and advantages of thermodynamic calculations in the study of RE-modified inclusions are introduced. Third, the changes in the corrosion resistance, impact properties,and other properties of steel caused by the modification of inclusions by RE are reviewed. Finally, the perspectives and trends of inclusions modified by RE elements in the steel industry are presented.

关键词： Rare earths Inclusions Modification Thermodynamic calculation Properties change

Construction of enhanced multi-polarization and high performance electromagnetic wave absorption by self-growing ZnFe_(2)O_(4)on Cu_(9)S_(5)

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1922-1934页

作者： wenxiong Chen Honglong Xing School of Chemical Engineering Anhui University of Science and TechnologyHuainan 232001China

The development of 3D structural composites with electromagnetic(EM)wave absorption could attenuate EM ***,magnetized flower-like Cu_(9)S_(5)/ZnFe_(2)O_(4)composites were fabricated through a multistep hydrothermal *** crystallographic and surface phase chemical information,morphological structure,and magnetic and EM parameters of the composites were *** prepared Cu_(9)S_(5)/ZnFe_(2)O_(4)composites have multiple loss paths for EM waves and present an overall 3D flower-like *** Cu_(9)S_(5)/ZnFe_(2)O_(4)composites exhibit a minimum reflection loss of-54.38 dB and a broad effective absorption bandwidth of 5.92 *** magnetization,ZnFe_(2)O_(4)particles are self-assembled and grown on the surfaces of Cu_(9)S_(5).Such a modification is conducive to the generation of additional cross-linking contact sites and the effective introduction of a large number of phase interfaces,crystalline defects,special three-dimensional flower-like structures,and magneto-electrical coupling loss ***,the synergistic effect of multiple loss strategies effectively improves EM wave absorption by the *** work can provide a strategy for the use of magnetizationmodified sulfide composite functional materials in EM wave absorption.

关键词： self-assembled material electromagnetic wave absorption enhanced multi-polarization effect Cu_(9)S_(5)/ZnFe_(2)O_(4)composites radar cross-section

Ecological processes, remediation and regulation of contaminated soils

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Science China(Life Sciences) 2005年第Z1期48卷 3-4页

作者： ZHOU Qixing & wang wenxiong

　　Land is used for agricultural production, industrial development, urban construction, and environmental beautification, thus soil environment is an important component of living ecosystems for human survival.……

关键词： soil Ecological processes remediation and regulation of contaminated soils

Decreasing mercury levels in consumer fish over the three decades of increasing mercury emissions in China

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Eco-Environment & Health 2022年第1期1卷 46-52页

作者： Hua Zhang wenxiong wang Chejen Lin Xinbin Feng Jianbo Shi Guibin Jiang Thorjørn Larssen State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang550081China Norwegian Institute for Water Research Økernveien 940579 OsloNorway School of Energy and Environment and State Key Laboratory of Marine Pollution City University of Hong KongKowloonHong Kong999077China Center for Advances in Water and Air Quality Lamar UniversityBeaumontTXUSA State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085China State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution School of Environmental StudiesChina University of GeosciencesWuhan430074China

Fish consumption is the primary dietary route of human exposure to *** has been well documented that elevated mercury concentration in fish in North America and Europe is linked to anthropogenic mercury *** is the world’s largest producer,consumer,and emitter of mercury,as well as the world’s largest commercial fish producer and *** mercury pollution in fish in China is currently receiving much attention worldwide,its status remains largely ***,we conducted a meta-analysis on total mercury concentrations in marine and freshwater fish samples,covering 35,464 samples collected in China over the past 30 *** is found that,opposite to the increasing emission and documented mercury contamination events,mercury levels in fish have gradually decreased in China over the past 30 *** results were in sharp contrast to those found in North America and *** mercury concentrations in fish were significantly anticorrelated with the fish catch and fish aquaculture and were inverse to trophic *** and the short lifecycle of aquaculture fish,both reducing the trophic level and the duration of mercury accumulation,were the most likely causes leading to the decline of mercury concentrations found in fish in China.

关键词： Meta-analysis Mercury Fish Spatial-temporal variability Freshwater and marine waterbodies China

农地整治权属调整中农户认知与行为的一致性研究

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资源科学 2018年第1期40卷 53-63页

作者：王梅汪文雄华中农业大学公共管理学院武汉430070

农户关于农地权属调整的认知与行为的一致性关系不仅是农地权属调整理论研究的重要内容,也是其政策制定的重要参考。为了探索农地整治权属调整中农户认知与行为的内在联系,本文在计划行为理论框架下,通过对湖北省7个市(县)644个农户的... 详细信息

农户关于农地权属调整的认知与行为的一致性关系不仅是农地权属调整理论研究的重要内容,也是其政策制定的重要参考。为了探索农地整治权属调整中农户认知与行为的内在联系,本文在计划行为理论框架下,通过对湖北省7个市(县)644个农户的问卷调查,运用相关性分析法检验农户认知与行为的相关性,并用多元有序Logistic模型分析受访者个体和家庭特征、耕地资源特征、村集体特征等因子对农户认知和行为影响的偏效应差异。结果表明:农户的认知状况在认知机制内部表现出不均衡性,农户行为的积极性缺乏;在一致性检验中,相关性分析和模型计量的结果均显示主观规范与行为的一致性较高,行为态度和认知控制与行为之间基本上不具备一致性。在此研究结果基础之上,提出关于信息公开、宣传动员、发挥组织作用等方面的政策建议,以此促进农地权属调整工作的顺利实施。

关键词：土地权属调整农户认知和行为计划行为理论相关性分析 Logistic模型

Recent Development of Heat Transfer and Fluid Flow of Supercritical CO2 in Tubes:Mechanisms and Applications

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Journal of Thermal Science 2024年第06期33卷 2274-2298页

作者： ZHANG Xirui SHAO Qihan LIU Jian XI wenxiong LIU Chaoyang SUNDEN Bengt Research Institute of Aerospace Technology Central South University College of Aerospace Science and Engineering National University of Defense Technology Department of Energy Sciences Lund University

With the advantages of low cost,excellent ability of heat and mass transfer and easy accessibility to the supercritical point,supercritical CO2has been applied in many engineering devices *** of the sharply-varying thermophysical properties near the supercritical point,heat transfer and flow behavior of supercritical CO2in tubes become complex and have received a lot of research *** main purpose of this paper is to summarize the findings of the published works related to flow phenomena and heat transfer characteristics of supercritical ***,influence parameters related to boundary conditions of supercritical CO2flowing in a smooth tube are ***,commonly-used turbulence and mathematic models dealing with internal flows of supercritical CO2are ***,research works on geometric effects of design parameters,shapes and configurations are *** practical applications of supercritical CO2in recent years are ***,developments and future challenges of supercritical CO2in tubes are analyzed and *** paper provides basic knowledge of heat transfer and fluid flow mechanisms and related practical applications of supercritical CO2in tubes.

关键词： developments and challenges flow behavior heat transfer practical applications supercritical CO2

不同类型农户对农地整治权属调整认知差异及其成因

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资源科学 2019年第7期41卷 1329-1338页

作者：汪文雄刘志强华中农业大学公共管理学院

权属调整作为农地整治工作的核心环节,在降低土地细碎化、提高农业生产机械化及化解农地权属纠纷等方面有着不可替代的作用。农户作为农地整治项目的主要受益者,提高农户对农地整治权属调整的认知,是促进其参与权属调整,从而推进农地整... 详细信息

权属调整作为农地整治工作的核心环节,在降低土地细碎化、提高农业生产机械化及化解农地权属纠纷等方面有着不可替代的作用。农户作为农地整治项目的主要受益者,提高农户对农地整治权属调整的认知,是促进其参与权属调整,从而推进农地整治工作的关键。本文基于湖北省11个县(市、区)农地整治项目区的实地调研数据,采用有序Logistic回归分析法研究农地整治权属调整中不同类型农户的认知差异及其成因。研究结果表明:各类农户对农地整治权属调整的行为态度的认知普遍较高,对主观规范的认知普遍不高,而对感知行为控制普遍较低;不同类型农户对农地整治权属调整的认知态度、主观规范及感知行为控制3个方面均存在显著差异,且其认知的影响因素也不相同。基于研究结果提出了如下政策建议:加强农地整治权属调整差别化入户宣传工作,发挥各类农村社会经济组织的利益协调作用,加强权属调整的相关培训,充分发挥认知态度较高农户的带头示范作用等,以促使农户转变观念并形成科学认知,进而促进农地整治权属调整工作的顺利开展。

关键词：农地整治权属调整农户认知差异 Logistic回归湖北省

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汞在海洋浮游植物中的生物累积和毒性效应

生态毒理学报 2014年第5期9卷 810-818页

作者：毋赟王文雄中国科学院南海海洋研究所热带海洋生物资源与生态重点实验室广州510301 香港科技大学生命科学学部香港九龙清水湾

浮游植物是海洋生态系统的主要初级生产者,同时作为食物也是许多水生生物摄取汞的主要途径。本文综述了近年来汞在海洋浮游植物中的最新研究进展,包括汞在浮游植物中的吸收、累积规律及其影响因素,汞对浮游植物的毒性效应(生长抑制、光... 详细信息

浮游植物是海洋生态系统的主要初级生产者,同时作为食物也是许多水生生物摄取汞的主要途径。本文综述了近年来汞在海洋浮游植物中的最新研究进展,包括汞在浮游植物中的吸收、累积规律及其影响因素,汞对浮游植物的毒性效应(生长抑制、光合作用影响)以及生物的适应机制(汞的还原、螯合解毒、矿化固定等),最后对浮游植物中汞累积和毒性的未来研究方向进行了展望。

关键词：汞海洋浮游植物生物累积毒性