农业科技投入的技术创新效率评价研究

基于1996—2016年中国农业科技投入、技术创新成果和农业产值等数据,利用时间序列误差修正模型,对政府科技支出的投入导向度、农业科技投入的创新贡献率和发展贡献率进行了测度,然后实证分析农业科技投入对农业技术创新和农业增长的影响。结论表明:政府农业科技投入的增加对非政府部门的农业科技投入增加有促进作用;农业科技投入对农业技术创新有显著的促进作用,但有一定的滞后效应;农业科技投入增加对农业增长有显著正向影响。依据分析的结论,提出了加强和完善农业科技投入的政策建议。     

国民经济调整时期国家财政支农倾斜政策的实施

在20世纪60年代的农业调整中,党和国家提出和实施了对农业的财政倾斜政策,加大了对农业的投资比重,增加了对农业的贷款,发放了大量的农村灾区救济款。对农业实行财政倾斜政策,是财政支农的主要方式,对于帮助农民解决生活、生产困难,促进农业的恢复和发展,发挥了重要作用。     

传统农业生产方式的困境及其转变

从农业的一般生产函数着手,分析了传统农业生产方式的消极影响及传统农业生产方式向现代农业生产方式转变的途径和困境,探讨了农业信息化对农业生产方式的促进作用,并证明了农业信息化对农业生产方式转变及农民增收有积极的促进作用.     

浅谈小金县——农业可持续发展与农业机械化

本文介绍了农业可持续发展中存在的几个主要问题,重点研究农业机械化在对耕地资源保护所起的作用,以及保护性耕作、化肥施用、秸秆处理、农药喷施等农业生产环节与农业可持续发展的关系及对机械装备的需求,工程技术措施对农产品加工、农业自然灾害防治、农业资源合理利用和农业环境保护的应用范围和效果。本文简单阐述了新时期农业机械化与信息化相结合对农业可持续发展所起的作用。从而得出农业机械化是小金县农业可持续发展的必要条件和重要技术手段的结论。     

浅析农业气象服务的现状和发展

通过农业气象业务、农业气象情报、农业气象预报、农业气候资源与区划、农业气象灾害监测评估和人工影响天气等方面对农业气象服务的现状做了叙述,分析了目前存在的问题,并对农业气象服务的未来发展作了一些展望。     

农八师石河子市农业经济信息网发展初探

<正>随着我国加入WTO,农业经济进入了对外开放的新阶段,农产品的市场竞争更加激烈。入世对我们的农业发展带来了巨大的挑战,也对农业信息化提出了迫切需求。1 建设师市农业经济信息网的意义 加快农业经济信息化建设,建立起师市农业生产与大市场之间的沟通渠道,缩短农业产供销的各     

农业灾害风险的影响因素和防范措施

我国是一个农业大国,农业的健康稳定发展对于整个国民经济具有重要作用,然而农业受灾害风险的影响较大,因此对农业灾害风险的研究具有很强的现实意义.就从农业灾害的危险性、地区农业本身的脆弱性和产业的应急能力水平三方面来对农业灾害的影响因素进行了分析,并对如何降低农业灾害风险提出了相应的对策,对促进农业产业的可持续发展和提高产业竞争力有重要作用.     

中国科技农业发展潜力分析

本文对科技农业给予界定 ,从不同的角度对中国科技农业 (主要包括设施农业、农业生物技术产业、农业信息产业 )的发展现状及发展潜力进行了分析     

艺术农业开发研究——以杨凌农业高新技术产业示范区为例

艺术农业是农业与艺术相结合的一种新型交叉型农业产业。在对艺术农业概念界定的基础上,分析了艺术农业的特点,并对其进行了分类。同时,以杨凌示范区为例,探讨了在杨凌开发艺术农业的可行性和发展思路。     

浅谈中国农业经济的发展

60年来,我国农业经济格局、农业经济模式都产生了翻天覆地的变化,本文总结了相关主要特点,并对未来趋势进行了判断。随着环境保护意识的增加,农业经济发展及农业环境的保护对我国新形势下相关农业经济政策的制定提出了更高的要求。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that