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本文通过对当前文献资料和出土的考古资料的总结,并在前人研究的基础上,对汉朝政府对鳏、寡、孤、独、高年的待遇问题从奖赏的内容方面入手,对其待遇所反映的深层含义做一剖析,最后对其待遇问题所产生的社会意义进行了归纳总结。 相似文献
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近几年来大庆市对住宅小区的平屋面实施"平改坡",起到了防雨、雪、风沙侵袭、保温隔热、美化环境、延长房屋使用寿命等作用,然而也存在诸多问题,根据我们对大庆市平改坡设计图纸的研究、对施工现场的观察以及物业管理中报修、检修、验收等反馈出来的常见问题进行分析,找到解决问题的对策,以期对现有和将要进行的平改坡提供参考. 相似文献
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五味子是我国的名贵中药材,对人体具有益气、滋肾、敛肺、固精、益脾、生津、安神等多种功效,然而,由于环境的破坏和对野生资源的掠夺式采摘,野生五味子资源的蕴藏量却在不断减少,依靠野生资源已远远不能满足市场对五味子的需求。本文从实用角度出发,对五味子人工栽培技术做了详细的阐述,以期望对日益发达的五味子栽培有所参考。 相似文献
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马水河特大桥施工用悬索栈桥的设计与施工 总被引:1,自引:0,他引:1
文章对悬索栈桥工程设计原理、设计要点、方法和程序进行了阐述,采用掘高夫的抛物线理论对主索进行计算分析计算,对桥面系结构、吊杆、索鞍、纵横风缆、主塔和主锚进行设计;并对施工过程的质量控制和成桥检测进行总结,同时对设计理论进行验证,对悬索栈桥的适应范围和特点进行描述,为该类型桥梁的推广提供设计和实践参考依据. 相似文献
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对电气设备的故障进行特征分析,根据其故障特点利用传感器对电气设备的故障信号、信息、参数等进行收集,通过其中央处理器的信号、信息、参数等,对数据、图形、图像进行处理,并得出处理结论。 相似文献
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基于比较优势理论的作物生产发展外显优势度评价 总被引:1,自引:0,他引:1
本文从生态、经济和社会综合的角度,对不同区域各主要作物的生产现状进行优势比较,反应出一定区域内某种作物在生产过程中对自然资源的利用效率、对生态环境的影响程度,对经济发展的有效程度,对社会需求的满足程度和对劳动力的吸纳程度等方面的比较优势,弥补了传统作物比较优势理论对资源环境的考虑不足。选取了华东地区江苏、浙江、安徽、福建、江西、山东6个省份作为评价区域,小麦、稻谷、玉米、大豆、棉花、花生、油菜、烤烟8种主要作物作为评价对象,分别进行了同一省份不同作物、同一作物不同省份的比较,得出了各个省份的优势作物,以及各种作物应当优先发展的省份,充分展现出了作物与省份的优势程度,能够为区域作物产业结构调整提供重要依据。 相似文献
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运用Citespace对2002-2010年图书信息学科50种核心期刊题录数据进行可视化分析,揭示出图书信息学科研究的10个子领域、代表研究热点的20个主题词、代表研究前沿的6个主题词,通过将数据划分为三个阶段并分析每个阶段内各年研究热点的变化,总结出图书信息学科研究特点. 相似文献
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本文对决策支持系统从管理信息系统析取数据的有关问题进行研究。提出了数据析取系统的四种模式,研究了它们的实现方式,并介绍了在客户关系管理中的应用。 相似文献
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Data availability and access to various platforms, is changing the nature of Information Systems (IS) studies. Such studies often use large datasets, which may incorporate structured and unstructured data, from various platforms. The questions that such papers address, in turn, may attempt to use methods from computational science like sentiment mining, text mining, network science and image analytics to derive insights. However, there is often a weak theoretical contribution in many of these studies. We point out the need for such studies to contribute back to the IS discipline, whereby findings can explain more about the phenomenon surrounding the interaction of people with technology artefacts and the ecosystem within which these contextual usage is situated. Our opinion paper attempts to address this gap and provide insights on the methodological adaptations required in “big data studies” to be converted into “IS research” and contribute to theory building in information systems. 相似文献
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海滨公园环境问题过往的相关研究主要集中于循环经济和分化处理两个方面的探讨,本文运用实地观察法和问卷调查法收集数据信息,借助相关软件进行数据梳理和数理分析,从旅游者行为学和人体工学两个研究视角来研究海滨公园的旅游垃圾问题。 相似文献
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Mary L. McHugh 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2013,23(2):143-149
The Chi-square statistic is a non-parametric (distribution free) tool designed to analyze group differences when the dependent variable is measured at a nominal level. Like all non-parametric statistics, the Chi-square is robust with respect to the distribution of the data. Specifically, it does not require equality of variances among the study groups or homoscedasticity in the data. It permits evaluation of both dichotomous independent variables, and of multiple group studies. Unlike many other non-parametric and some parametric statistics, the calculations needed to compute the Chi-square provide considerable information about how each of the groups performed in the study. This richness of detail allows the researcher to understand the results and thus to derive more detailed information from this statistic than from many others.The Chi-square is a significance statistic, and should be followed with a strength statistic. The Cramer’s V is the most common strength test used to test the data when a significant Chi-square result has been obtained. Advantages of the Chi-square include its robustness with respect to distribution of the data, its ease of computation, the detailed information that can be derived from the test, its use in studies for which parametric assumptions cannot be met, and its flexibility in handling data from both two group and multiple group studies. Limitations include its sample size requirements, difficulty of interpretation when there are large numbers of categories (20 or more) in the independent or dependent variables, and tendency of the Cramer’s V to produce relative low correlation measures, even for highly significant results. 相似文献
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BitLocker是通过全卷加密和安全启动技术来保护存储在计算机上的数据,研究了全卷加密技术的原理,提出了结合BitLocker、加密文件系统以及版权控制3种技术来提高数据的安全性,目的是防止从被窃或丢弃的硬盘驱动器中进行不必要的数据恢复。 相似文献
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Just like any other scientific research field, the value of data quality is undisputed in the field of transportation. From policy planning to performance evaluation, from model development to impact studies, good quality data is essential to generate ideas and clear-cut solutions to be implemented by transportation professionals and decision makers. 相似文献
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Frank Mueller-Langer Benedikt Fecher Dietmar Harhoff Gert G. Wagner 《Research Policy》2019,48(1):62-83
We investigate how often replication studies are published in empirical economics and what types of journal articles are replicated. We find that between 1974 and 2014 0.1% of publications in the top 50 economics journals were replication studies. We consider the results of published formal replication studies (whether they are negating or reinforcing) and their extent: Narrow replication studies are typically devoted to mere replication of prior work, while scientific replication studies provide a broader analysis. We find evidence that higher-impact articles and articles by authors from leading institutions are more likely to be replicated, whereas the replication probability is lower for articles that appeared in top 5 economics journals. Our analysis also suggests that mandatory data disclosure policies may have a positive effect on the incidence of replication. 相似文献
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William B. Rouse Sandra H. Rouse David R. Morehead 《Information processing & management》1982,18(3):141-149
The strategies, heuristics, and tradeoff?s involved in online searching of bibliographic citation networks are discussed. Results from the field of citation analysis are used to describe the mathematical structure of citation networks. An experimental environment called DBASE (Data Base Access and Search Environment) is discussed and its use in two studies of human information seeking behavior considered. Variables examined in these studies included the nature of the search question and the interconnectivity of the data base. 相似文献