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。     

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。     

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。     

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。     

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     

云南农业气象信息服务发展策略研究

文章评述了云南传统的农业气象信息服务产品与手段的局限性,引入了定单农业和供应链管理的概念,分析了农业气象信息服务现代化对农业可持续发展的重要性,探讨了在当今农业可持续发展战略中定单农业的生产经营条件下,适应农业生产经营新环境的农业气象信息服务发展策略.     

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.     

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。     

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。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with