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Search Results: 1 - 10 of 175942 matches for " 陈绳栋 "
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粮食种植户生产环节外包选择行为分析
Farmers’ Selection Behavior in Process of Grain Production Stage Outsourcing

,,王礼力,,,
- , 2017,
Abstract: 在构建粮食种植户生产环节外包选择行为理论框架的基础上,运用河南和山西两省小麦主产区2015年631户小麦种植户的第一手调查数据,采用Ivprobit模型分析验证资本密集环节和劳动密集环节的外包行为影响因素,以及资本要素与劳动要素的内部影响关系。研究得出:粮食种植仍以小规模农户为主。资本密集环节外包的比例较高,尤其是机械替代性较强的耕地、播种和收割环节。劳动密集环节外包的比例较低。资本要素对粮食生产的纵向分工和规模化种植有重要的影响。劳动要素对种植户劳动力的非农转移和种植业的兼业化生产具有重要的影响。依据研究结论提出以下建议:鼓励农业社会化服务体系的建设,满足多种农业生产主体的不同需求。鼓励外包服务主体对烘干设施的购置,建设有效外包服务的供需市场。鼓励劳动力从农业向非农业的转移,同时提高专业种植户的农业生产技能。
Stage outsourcing behavior of grain producers has become increasingly important because of the rapid transformation of China’s countryside. However, few studies have addressed this issue using a theoretical framework. We set out to fill this gap in the literature by developing a theoretical model that integrates determinants of grain farmers’ outsourcing behavior and the number of grain growing stages outsourced, and use a Probit Model to estimate the influencing factors of seven stages outsourcing and the number of outsourcing. Moreover, a instrumental variable probit model is used to determine whether the influencing factors are endogenous or not. In particular, we use 2015 data from 631 wheat farmers in Henan and Shanxi provinces. The survey covered 7 wheat growing stages in winter period. Descriptive and regression results show that:(1) Small scale grain farmers are in the majority. (2) The proportion of capital intensive outsourcing is higher, in addition to the ploughing sector, sowing sector and harvesting sector, which are strong mechanical replacement parts; on the country, labor intensive outsourcing ratio is low. (3) Capital factors have an important influence on vertical division of grain production and scale production. (4) Labor factors have an important influence on the non agricultural transfer of plantation labor and the part time farming of grain planting industry. In light of these findings, it is suggested that the amount of machinery for grain farmers is gradually increased to develop the supply and demand of outsourcing market. Policy maker should encourage non agricultural labor transfer and improve the ability of non agricultural labor workers, at the same time, strengthen the training efforts of grain planting technology, and especially pay attention to the model effect of science and technology demonstration households.
海岸地区海水入侵盐份的预告与控制

海洋科学 , 1985,
Abstract: 迄今,世界上对海水的入侵问题还未获得解决。为了使海岸地区与三角洲地区供水问题得以保证,需对海水入侵盐份进行预告,并采用有效工程予以控制,这对沿海地区的开发与开放都具有重要意义。 一、盐份的来源 海岸地区或三角洲地区盐份来源颇多,除海水入侵外,还有低洼地含盐地下水的渗漏、由盐土中扩散的盐份、农田回归水中排出的盐份等。大自然中也有大气盐份供给,但其量甚微,可以忽略不计。 伴随着潮汐、海浪向海岸和河口三角洲入侵的盐份,其影响大、范围广,是要着重研究的对象。至于
论地貌单位线的理论与应用

科学通报 , 1988,
Abstract: 近年来已有不少学者对地貌单位线作过研究,诸如Rodriguez-Iturbe,Valdes,Gupta,Wang,Gonzalez-Sanabria,Bras,Chen等。他们研究了流域地貌特征与反应函数之间关系,提出了地貌单位线的理论、模型,从而将汇流理论开辟一条随机的新途径。
关于变动单位线分析方法的建议

科学通报 , 1978,
Abstract: 线性单位线是变动单位线的一个特例。这个问题,在1960年由Nash提出线性单位线理论模式之后,相隔十三年后,由Mandeville和O'Donnell提出变时间理论单位线的模式,并证明了Nash模式仅属于他们提出普遍模式的一种特例。可惜仅停留在理论上,距实用尚有
国际法上的创举:法国与西德拟开设联合使馆

中外法学 , 1989,
Abstract:
禁止有偿代客生育法在美国

中外法学 , 1989,
Abstract:
《布莱克法学词典》点评

比较法研究 , 2001,
Abstract:
地貌气候单位线的一个算例

地理研究 , 1986, DOI: 10.11821/yj1986030005
Abstract: 本文基于地貌气候单位线的理论,提出了合理的分析与计算方法。并举一个实例,以资参考。
论地貌单位线的理论与应用

科学通报 , 1988,
Abstract: 近年来已有不少学者对地貌单位线作过研究,诸如Rodriguez-Iturbe,Valdes,Gupta,Wang,Gonzalez-Sanabria,Bras,Chen等。他们研究了流域地貌特征与反应函数之间关系,提出了地貌单位线的理论、模型,从而将汇流理论开辟一条随机的新途径。
论两种不同性质水文系统的转换

科学通报 , 1983,
Abstract: 近年来对线性与非线性系统已作过不少的研究。前者以卷积为代表,即~~
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