共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
5.
“数字农业”已成为世界新的农业科技革命的重要内容。本文从数字农业的概念和国内外发展现状出发,采用SWOT分析方法,详尽地分析论述了宝鸡市率先发展数字农业的优势、劣势、机遇和挑战,并在此基础上提出了当前宝鸡市率先发展数字农业的基本对策。 相似文献
6.
7.
8.
9.
农业数字信息资源建设的长效机制 总被引:2,自引:0,他引:2
数字资源建设是数字图书馆的核心内容,是数字图书馆建设的基础。农业高校图书馆是整个社会信息体系中重要的信息集散地和农业信息中心,加强农业数字信息资源建设,对促进农业科研成果的提高和现代化农业经济的长效发展具有重要意义。 相似文献
10.
在分析了中国农业科学院图书馆国外科技文献订购及到货现状的基础上,从优化本馆文献订购模式、完善文献到货催缺制度、加强相关制度落实等角度,探讨了有效提高农业及相关学科国外科技文献订到率、到货率、到全率及保障能力的方法。 相似文献
11.
城郊环境特征、问题及其改善对策 总被引:1,自引:0,他引:1
随着近几年城市化进程的加快,城市郊区出现了一系列特有的环境问题,从城郊的社会、经济、文化背景出发分析了郊区环境的特征及其产生根源,并据此提出改善措施。 相似文献
12.
13.
目前,湖南省信息化建设正处于一个蓬勃发展稳步提速的关键期,及时发现建设中存在的问题并合理解决,以经验总结和理论创新为推手促进农村农业信息化建设稳步快速进行是一项意义重大的工作。以大通湖区调研为例,通过实地调研,深入了解大通湖区农村农业信息化建设现状,分析农村农业信息化建设中存在的问题,在统计分析的基础上明确农村农业信息化建设的整体情况。研究结果表明,该区紧密结合农垦区的区域经济、产业要求和自身条件,在农村农业信息化建设方面发展迅速且成绩显著,但仍存在信息传播渠道单一、缺乏信息价值预判、农业信息员队伍建设滞后、农业电子商务环节薄弱等问题。针对大通湖区在农村农业信息化建设中存在的问题,提出了相应的解决对策,以期促进问题的快速解决。 相似文献
14.
P. A. Kozhevin 《Moscow University Soil Science Bulletin》2011,66(1):42-44
Several problems of soil biotechnology and their relation with global ecological problems are considered. An analysis of the
principal opportunities for soil biota management shows that scientific progress in this field is a necessary but insufficient
condition for the solution of these global problems. 相似文献
15.
16.
Conservation problems typically involve groups with competing objectives and strategies. Taking effective conservation action requires identifying dependencies between competing strategies and determining which action optimally achieves the appropriate conservation goals given those dependencies. We show how several real-world conservation problems can be modeled game-theoretically. Three types of problems drive our analysis: multi-national conservation cooperation, management of common-pool resources, and games against nature. By revealing the underlying structure of these and other problems, game-theoretic models suggest potential solutions that are often invisible to the usual management protocol: decision followed by monitoring, feedback and revised decisions. The kind of adaptive management provided by the game-theoretic approach therefore complements existing adaptive management methodologies. 相似文献
17.
低丘红壤旱地水分问题及其解决途径研究进展 总被引:10,自引:0,他引:10
阐述了低丘红壤旱地的季节性干旱和土壤物理性退化等导致的水分问题 ,总结了一些实际可行的减缓水分问题的有效措施 ,如 :农林复合生态系统的构建、植被覆盖、合理轮作、以肥调水、灌溉系统和改良土壤结构等。并在回顾有关研究的基础上 ,对低丘红壤区水分问题的研究和解决途径提出展望 相似文献
18.
公路建设项目因其弃土弃渣量多、损坏地貌植被面积较大而对公路沿线生态环境的破坏较为严重。针对目前公路建设项目水土保持方案编制工作中存在的一些问题,从水土保持法规及技术的角度进行了分析探讨,并提出了相应的解决方法。 相似文献
19.
介绍了中文期刊登到的基本流程,探讨了中文期刊登到过程中常见问题及处理方法,并提出完善期刊登到工作的几点建议。 相似文献
20.
Major transition has occurred in recent years in statistical methods for analysis of linear mixed model data from analysis of variance (ANOVA) to likelihood-based methods. Prior to the early 1990s, most applications used some version of analysis of variance because computer software was either not available or not easy to use for likelihood-based methods. ANOVA is based on ordinary least squares computations, with adoptions for mixed models. Computer programs for such methodology were plagued with technical problems of estimability, weighting, and handling missing data. Likelihood-based methods mainly use a combination of residual maximum likelihood (REML) estimation of covariance parameters and generalized least squares (GLS) estimation of mean parameters. Software for REML/GLS methods became readily available early in the 1990s, but the methodology still is not universally embraced. Although many of the computational inadequacies have been overcome, conceptual problems remain. Also, technical problems with REML/GLS have emerged, such as the need for adjustments for effects due to estimating covariance parameters. This article attempts to identify the major problems with ANOVA, describe the problems which remain with REML/GLS, and discuss new problems with REML/GLS. 相似文献