基于溯源技术的蔬菜基地管理系统开发与应用   总被引：2，自引：0，他引：2  

邱荣洲  池美香  陈宏  翁启勇  赵健 《中国农业科技导报》2017,19(4):51-58

蔬菜是我国重要的农产品,其质量安全问题关系着国计民生,一直是社会关注的重点。当前我国的蔬菜产品质量安全问题仍然十分广泛和严重,问题蔬菜的来源去向不明、责任不清,企业对蔬菜种植基地的管理缺乏有效的信息管理手段,消费者对购买蔬菜缺乏有效可靠的信息获取途径。因此,从信息技术的角度构建了一个基于溯源技术的蔬菜基地管理系统,详细介绍了蔬菜溯源码的设计、系统的开发环境、业务流程与主要功能,并重点阐述以规程控制为农业生产指导的蔬菜安全管理模式。系统的开发与应用,实现了"问题蔬菜"的企业内部溯源,以及消费者通过手机查询蔬菜溯源信息,为蔬菜企业提供了对基地种植进行质量管理的信息化工具,为政府提供了一种溯源系统解决方案。  相似文献   

山东农业科技期刊学术影响力分析与动态评估   总被引：1，自引：0，他引：1  

赵文祥  郭凤丹  王丽丽  梅林  田淑慧  陈庆禹  张丽荣  连京华 《山东农业科学》2014,(8):127-131

利用动态评估模型对2008~2012年山东13种农业科技期刊的学术影响力进行分析。结果显示,2008~2012年中,13种农业类科技期刊的总被引频次和影响因子总体呈上升趋势,5年间,平均总被引频次增加了84.85%,平均影响因子增加了47.35%;平均学术影响力呈快速增长趋势,5年间增长了268%。各期刊发展不均衡,其中,《山东农业科学》和《中国烟草科学》学术影响力分别位居第一和第二,且发展态势良好。  相似文献   

学科影响指标在期刊评价中的作用探讨     

房威  朱安  李杨  张志转  朱永和 《安徽农业科学》2011,39(2):F0002-F0002,F0003

对学科影响指标反映期刊学术影响力的情况、与其他评价指标之间的联系、在期刊学科分类工作中的作用及其存在的局限性进行了初步分析和探讨。  相似文献   

保健食品中原花青素测定的不确定度评定     

冯俊 《农产品加工．学刊》2011,(4):86-88,118

对保健食品中原花青素的测定进行不确定度的评定,建立不确定度评定程序和方法。依据《保健食品检验与评价技术规范》建立数学模型,进行不确定度的计算并合成不确定度。找出了影响保健食品中原花青素测定的主要因素,分析归纳了不确定度分量的主要来源。评定程序和方法符合规范要求,适用于同类型试验不确定度评定。  相似文献   

乡镇农产品质量安全监管机构建设研究     

海力帕木·吾麦尔 《湖南农机》2016,(1)

农产品质量安全关乎国计民生,近年来国家不断推出农产品质量安全监管措施.但还有许多地方政策落实不到位,乡镇农产品质量安全监督体系建设的任务还很艰巨.因此,政府要加大投入,完善机构队伍建设及强化监管能力建设,提升监督服务意识、服务质量和服务水平.  相似文献   

农业科研机构创新绩效评价浅议     

张江丽  刘蓉蓉 《农业科研经济管理》2016,(4):42-45

文章简要探讨农业科研机构创新绩效评价的目的意义、内容方法、评价指标体系和结果运用等，为农业科研机构创新绩效评价体系建立提供参考。  相似文献   

我国有机水稻发展对策探析   总被引：4，自引：0，他引：4  

李福兴 《河北农业科学》2011,15(2):24-26

阐述了我国发展有机水稻的积极意义，分析了有机水稻发展的制约因素，并提出了我国政府提高对有机水稻生产的支撑、扶持龙头企业的壮大发展、加强市场监管、采用合理的方式组织规模生产、实行科学种田等措施促进有机水稻良性发展。  相似文献   

各向同性人造板材料弹性模量测量及其标准差评价     

王正  杨小军  梁星宇 《西南林业大学学报》2012,(1):83-87

弹性模量是衡量人造板材料力学性能的重要指标,用标准差法对其进行综合评价尤为必要,对其实测及方差分析具有较好的应用价值。采用三点弯曲静力法和悬臂梁自由端振动法,测定各向同性HDF、三合板和OSB试材的静弹性模量和动弹性模量。在实测数据分析中,为反映总体弹性模量实测值数据集的离散程度及落在样本统计值某一区内的概率,还确定了其置信区间,评价了置信度。结果表明:各向同性人造板材料的静弹性模量和动弹性模量测试结果一致,其置信区间越大,置信水平越高。  相似文献   

Environmental Change and the Sustainability of European Forests     

《Journal of Sustainable Forestry》2013,32(2-3):165-187

Summary

It is some years now since forest decline was a major public concern in Europe and was one of the principal environmental issues around which international research programs were focused. A number of internationally coordinated activities were initiated in the 1980s and 1990s and have continued until now; these contributed significantly to our current understanding of forestry and to the way in which forestry policies have developed. In short, the concept of sustainable development has had an increasing influence and is now of immeasurable value in forest policy, with sustainable forest management well established as its guiding principle. This sequence of events is examined here. The extent to which understanding has advanced is remarkable; much has changed. Arguably this period gave the first indication of the extent to which forests and ecosystems globally are threatened by environmental change. On the basis of the last 20 years, it is tempting to conclude that we now have an effective institutional framework and have made excellent progress. However, some of the recorded ecosystem responses seem anomalous; there are surprises in system responses, e.g., the linkage between sulphur and nitrogen depositions and forest growth. Even more importantly some specific pollutant problems remain and will intensify, and climate change has become an environmental issue of overwhelming importance.  相似文献   

Emerging issues in genomic selection     

Ignacy Misztal  Ignacio Aguilar  Daniela Lourenco  Li Ma  Juan Pedro Steibel  Miguel Toro 《Journal of animal science》2021,99(6)

Genomic selection (GS) is now practiced successfully across many species. However, many questions remain, such as long-term effects, estimations of genomic parameters, robustness of genome-wide association study (GWAS) with small and large datasets, and stability of genomic predictions. This study summarizes presentations from the authors at the 2020 American Society of Animal Science (ASAS) symposium. The focus of many studies until now is on linkage disequilibrium between two loci. Ignoring higher-level equilibrium may lead to phantom dominance and epistasis. The Bulmer effect leads to a reduction of the additive variance; however, the selection for increased recombination rate can release anew genetic variance. With genomic information, estimates of genetic parameters may be biased by genomic preselection, but costs of estimation can increase drastically due to the dense form of the genomic information. To make the computation of estimates feasible, genotypes could be retained only for the most important animals, and methods of estimation should use algorithms that can recognize dense blocks in sparse matrices. GWASs using small genomic datasets frequently find many marker-trait associations, whereas studies using much bigger datasets find only a few. Most of the current tools use very simple models for GWAS, possibly causing artifacts. These models are adequate for large datasets where pseudo-phenotypes such as deregressed proofs indirectly account for important effects for traits of interest. Artifacts arising in GWAS with small datasets can be minimized by using data from all animals (whether genotyped or not), realistic models, and methods that account for population structure. Recent developments permit the computation of P-values from genomic best linear unbiased prediction (GBLUP), where models can be arbitrarily complex but restricted to genotyped animals only, and single-step GBLUP that also uses phenotypes from ungenotyped animals. Stability was an important part of nongenomic evaluations, where genetic predictions were stable in the absence of new data even with low prediction accuracies. Unfortunately, genomic evaluations for such animals change because all animals with genotypes are connected. A top-ranked animal can easily drop in the next evaluation, causing a crisis of confidence in genomic evaluations. While correlations between consecutive genomic evaluations are high, outliers can have differences as high as 1 SD. A solution to fluctuating genomic evaluations is to base selection decisions on groups of animals. Although many issues in GS have been solved, many new issues that require additional research continue to surface.  相似文献