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Is the feminization of labor harmful to agricultural production? The decision-making and production control perspective

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Journal of Integrative Agriculture 2019年第6期18卷 1392-1401页

作者： LIU Jia-cheng XU Zhi-gang zheng qiu-fen Lillian Hua School of Economics and Management Nanjing Agricultural UniversityNanjing 210095P.R.China School of Public Health Yale UniversityNew Haven 06510USA

Even today,academics continue to debate the effect of feminization of agricultural labor force on agricultural *** considering the dimensions of participation in decision-making and production,this study divides the various agricultural production models into three types:(i)the traditional model of decisions made either jointly by men and women or by men alone while both genders participate in production,(ii)complete feminization of agricultural decision-making and the production labor force,and(iii)feminization of the agricultural production labor force *** study investigates the effects of combining or separating decision-making and production in regard to agricultural development in the context of feminization of the agricultural labor *** follow-up data collected from 2004–2008 by the Ministry of Agriculture of China,we built a comprehensive panel data model to test our *** research shows that in comparison to traditional agricultural households and fully feminized agricultural labor forces,partially feminized production resulted in lower grain yield and technological *** feminization of agricultural labor does not necessarily have a negative impact on agricultural output,especially since heavy manual labor is being increasingly replaced by agricultural machinery and outsourcing of *** degree of feminization of the decision-making and production processes should be an important consideration when evaluating the purported negative effects of the feminization of agricultural labor.

关键词： feminization agricultural labor production decision-making control production management control

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数据要素赋能、要素成本结构变化与小农户向大农场转型

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经济体制改革 2024年第2期 81-87页

作者：郑秋芬刘家成蚌埠学院经济与管理学院安徽蚌埠233030 南京财经大学财政与税务学院江苏南京210028

数据要素参与农业经营对农业现代化转型有着重要且复杂的影响。构建“数据赋能-要素成本结构-小农经营方式转型”的理论框架,实证检验数据要素投入在中国农业经营方式转型中的作用。研究发现,数据要素参与农业经营虽弱化小农户的信贷约... 详细信息

数据要素参与农业经营对农业现代化转型有着重要且复杂的影响。构建“数据赋能-要素成本结构-小农经营方式转型”的理论框架,实证检验数据要素投入在中国农业经营方式转型中的作用。研究发现,数据要素参与农业经营虽弱化小农户的信贷约束,但也会强化大农场经营的市场势力优势以及弱化大农场的雇工效率劣势,进而增加大农场经营净优势。实证结果也表明,数据要素通过赋能劳动力、资本等传统要素改变小农户和大农场的要素成本结构,对小农户向大农场转型有着正向作用。据此,应重视数据要素的引入,完善数据基础设施,促进农业现代化转型。

关键词：数据要素成本结构规模经营小农户转型

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南疆三地州粮棉果间作经济效益评价

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新疆农业科学 2015年第4期52卷 759-766页

作者：郑秋芬陈彤刘国勇新疆农业大学经济与贸易学院乌鲁木齐830052 新疆农业科学院乌鲁木齐830052

【目的】实地调研南疆三地州的粮食棉花果树间作模式,了解当地的多种间作模式及其基本情况,确定粮棉果最佳的间作模式。【方法】选取10个静态指标和2个动态指标,改进的主成分分析法对24种粮棉果间作模式的经济效益评价,并用熵值法进行... 详细信息

【目的】实地调研南疆三地州的粮食棉花果树间作模式,了解当地的多种间作模式及其基本情况,确定粮棉果最佳的间作模式。【方法】选取10个静态指标和2个动态指标,改进的主成分分析法对24种粮棉果间作模式的经济效益评价,并用熵值法进行复核评价,两者的评价结果通过了Kendall-W协和系数法的一致性检验,由集成综合评价法得最终评价结果结果。【结果】果树处于不同时期,其适宜的间作模式不同,因果树类别及间作作物而异;处于盛果期时,核桃-小麦、核桃-玉米、核桃-小麦-玉米,这种核桃间作粮食作物的模式的经济效益较高,并且除了棉花单作的经济效益较高外,其他单作的经济效益都比间作低。【结论】粮棉果间作有利于提高农民的收入水平。

关键词：粮果间作棉果间作经济效益评价

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资产专用性、环境和行为不确定性对农民专业合作社绩效的影响——一个基于交易成本理论的分析框架

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农村金融研究 2022年第9期 71-80页

作者：郑秋芬刘家成南京农业大学经济与管理学院南京财经大学财政与税务学院

合作社自身经营绩效的实现是其带动小农户增收的重要前提。交易成本是影响合作社绩效的重要因素,然而鲜有文献就销售型合作社中交易成本的来源及其对合作社绩效的影响进行深入讨论。有序Logit模型结果表明:资产专用性水平对销售型合作... 详细信息

合作社自身经营绩效的实现是其带动小农户增收的重要前提。交易成本是影响合作社绩效的重要因素,然而鲜有文献就销售型合作社中交易成本的来源及其对合作社绩效的影响进行深入讨论。有序Logit模型结果表明:资产专用性水平对销售型合作社绩效有显著正向影响,但纳入环境不确定性后,这种正向作用被弱化;行为不确定性对销售型合作社绩效有显著负向影响。通过IV、Heckman两步法,以及PSM弱化内生性之后,上述结论依然成立。探明资产专用性水平、环境和行为不确定性对销售型合作社绩效影响的内在机制,为更加全面地认识合作社在当前环境中面临的制约因素、发展空间提供了新认识。

关键词：资产专用性环境不确定性行为不确定性合作社绩效

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SWAT-based runoff and sediment simulation in a small watershed,the loessial hilly-gullied region of China:capabilities and challenges

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International Journal of Sediment Research 2012年第2期27卷 226-234页

作者： Lin-jing qiu fen-li zheng Run-sheng YIN College of Forestry Northwest A&F University State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water Resources College of Resources and Environment Northwest A&F University Department of Forestry Michigan State University

Model calibration and validation are necessary before applying it for scenario assessment and watershed *** study presented the methodology of evaluating Soil and Water Assessment Tool(SWAT) and tested the feasibility of SWAT on runoff and sediment load simulation in the Zhifanggou watershed located in hilly-gullied region of *** runoff and sediment event data from 1998-2008 were used in this study;data from 1998-2003 were used for calibration and 2004-2008 for *** evaluation statistics for the daily runoff simulation showed that the model results were acceptable,but the model underestimated the runoff for high-flow *** sediment load simulation,the SWAT performed well in capturing the trend of sediment load,while the model tended to underestimate sediment load during both the calibration and validation periods. The disparity between observed and simulated data most likely resulted from limitations of the existing SCS-CN and MUSLE methods in the *** study indicated that the modification of SWAT components is needed to take rainfall intensity and its duration into account to enhance the model performance on peak flow and sediment load simulation during heavy rainfall season.

关键词： Loessial hilly-gullied region Runoff Sediment load SWAT Watershed

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Selective Aggregation of Silver Nanoprisms Induced by Monohydrogen Phosphate and its Application for Colorimetric Detection of Chromium(Ⅲ) Ions

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Journal of Analysis and Testing 2021年第3期5卷 225-234页

作者： zheng-fen Pu Bi-Chao Wu Yuan-Hang Tan qiu-Lin Wen Jian Ling qiu-E Cao Functional Molecules Analysis and Biotransformation Key Laboratory of Universities in Yunnan Province School of Chemical Science and TechnologyYunnan UniversityKunming 650091China

In this study,we established a simple colorimetric method for visual detection of chromium(Ⅲ)ions using aggregated silver nanoprisms induced by monohydrogen *** detection strategy had two steps,selective aggregation of silver nanoprisms with monohydrogen phosphate at high temperature,and anti aggregation of silver nanoprisms in the presence of chromium(Ⅲ)*** this strategy,significant spectral shift of the localized surface plasmon resonance(LSPR)absorption peak of silver nanoprisms could be visualized with the color changed from yellow to *** spectral peak shift of silver nanoprisms in the anti-aggregation process was linear with the concentrations of the added chromium(Ⅲ)ions in the range of 20.0-800.0 ***,a colorimetric method for chromium(Ⅲ)ions detection was established with the detection limit of 3.6 *** experimental results of real water samples indicated that the colorimetric sensor was potential in environmental monitoring.

关键词： Silver nanoprisms Aggregation Chromium Localized surface plasmon resonance Monohydrogen phosphate

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Application of the Störmer–Verlet-Like Symplectic Method to the Wave Equation

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Chinese Physics Letters 2013年第8期30卷 9-12页

作者： qiu Yu-fen WU Xin School of Science Nanchang UniversityNanchang 330031

A fourth-order three-stage symplectic integrator similar to the second-order Störmer–Verlet method has been proposed and used before[***.28(2011)070201;*** 126(2011)73].Continuing the work initiated in the publications,we investigate the numerical performance of the integrator applied to a one-dimensional wave equation,which is expressed as a discrete Hamiltonian system with a fourth-order central difference approximation to a second-order partial derivative with respect to the space *** is shown that the Störmer–Verlet-like scheme has a larger numerical stable zone than either the Störmer–Verlet method or the fourth-order Forest–Ruth symplectic algorithm,and its numerical errors in the discrete Hamiltonian and numerical solution are also smaller.

关键词： Hamiltonian symplectic numerical

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Enhanced uptake and anti-maturation effect of celastrol-loaded mannosylated liposomes on dendritic cells for psoriasis treatment

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Acta Pharmaceutica Sinica B 2022年第1期12卷 339-352页

作者： Long Xi Zibei Lin fen qiu Shaokui Chen Ping Li Xin Chen Zhenping Wang Ying zheng State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacao 999078China Beijing Hospital of Traditional Chinese Medicine Affiliated with Capital Medical UniversityBeijing 100050China Department of Dermatology School of MedicineUniversity of CaliforniaSan DiegoCA 92093USA

Psoriasis is an autoimmune skin disease in which dendritic cells(DCs) trigger the progression of psoriasis by complex interactions with keratinocytes and other immune cells. In the present study,we aimed to load celastrol, an anti-inflammatory ingredient isolated from Chinese herbs, on mannosylated liposomes to enhance DC uptake as well as to induce DC tolerance in an imiquimod-induced psoriasis-like mouse model. Mannose was grafted onto liposomes to target mannose receptors on DCs. The results demonstrated that compared with unmodified liposomes, DCs preferred to take up more fluorescence-labeled mannosylated liposomes. After loading celastrol into mannose-modified liposomes,they effectively inhibited the expression of maturation markers, including CD80, CD86 and MHC-II, on DCs both in vitro and in vivo. Additionally, after intradermal injection with a microneedle, celastrolloaded mannose-modified liposomes(CEL-MAN-LPs) achieved a superior therapeutic effect compared with free drug and celastrol-loaded unmodified liposomes in the psoriasis mouse model in terms of the psoriasis area and severity index, histology evaluation, spleen weight, and expression of inflammatory cytokines. In conclusion, our results clearly revealed that CEL-MAN-LPs was an effective formulation for psoriasis treatment and suggested that this treatment has the potential to be applied to other inflammatory diseases triggered by activated DCs.

关键词： Psoriasis Celastrol Mannose Liposome Anti-maturation Dendritic cells Microneedle Inflammation

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Synthesis and biological evaluation of 2,4-diaminopteridine derivatives as nitric oxide synthase inhibitor

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Chinese Chemical Letters 2009年第4期20卷 420-422页

作者： Fei Ma Gang Lu Wei fen Zhou qiu Juan Wang Yi Hua Zhang Qi zheng Yao School of Pharmacy China Pharmaceutical University Nanjing 210009 China

A series of novel 2,4-diamino-pteridines （9a-l） were synthesized and evaluated as inhibitors of inducible nitric oxide synthase （iNOS） in vitro. It was found that 9a, 9d, 9e, 9h, 9i and 91 showed potent inhibitory activities similar to that of methotrexate （MTX）, while the activities of 9b, 9c, 9f, 9g, 9j and 9k are stronger than MTX.

关键词： Nitric oxide Tetrahydrobiopterin Nitric oxide synthase Synthesis Inhibitive activity

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以PBL模式为引导的护生主查房效果研究

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西北医学教育 2012年第4期20卷 772-775页

作者：李冬梅刘燕仇正芬吴东红肖妮妮朱建英第二军医大学附属长海医院神经外科上海200433

目的观察研究以PBL模式为引导的护生主查房在临床带教中的效果。方法2009年6月-2011年3月在长海医院神经科实习的护生40名,随机分成试验组和对照组每组各20人。试验组开展以护生为主体带教教师为引导,开展PBL模式的教学查房。对照组护... 详细信息

目的观察研究以PBL模式为引导的护生主查房在临床带教中的效果。方法2009年6月-2011年3月在长海医院神经科实习的护生40名,随机分成试验组和对照组每组各20人。试验组开展以护生为主体带教教师为引导,开展PBL模式的教学查房。对照组护生不单独负责教学查房,只参与科室组织的教学查房。结果两组护生出科考试成绩对比、两组护生病人对床位护生的评价比较、两组护生带教教师对护生的评价比较和两组护生实习结束后自我评价对比结果显示试验组均要好于对照组,组间除出科操作考试成绩无统计学差异外,其它均有统计学差异(P<0.05)。结论护生主查房充分体现以病例为引导、以问题为基础、以护理程序为框架相结合的查房模式,能充分调动学生的学习兴趣和提高对护理技能的掌握,还能培养和提高与患者之间的亲和力,增强护生的自我价值感。

关键词：临床带教护生教学查房

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