论电子阅览室的知识导航与信息服务

本文立足于知识导航与信息服务，对网络环境下电子阅览室的服务内容、服务保障、目前面临的现状进行了论述，并提出了服务对策。     

多组离合器参与的换挡过程混合建模与仿真

在分析多组离合器参与的自动变速器换挡过程特点的基础上,指出该换挡过程是由连续系统与离散系统组成的混合系统,进而提出基于键合图理论的连续系统和基于有限状态机的离散系统的换挡过程混合建模方法。在Matlab／Simulink和Matlab／Stateflow平台上建立了包含多种状态的东方红1302R型橡胶履带拖拉机液压机械无级变速器的换挡过程仿真模型,仿真结果表明该建模方法能很好地模拟自动变速器换挡过程中离合器的动态行为,并通过仿真分析了其对换挡品质的影响。     

基于键合图理论的动力稳定装置轮轨间动态特性分析

考虑动力稳定装置的轮轨非线性接触、轮轨间的间隙传动、夹钳油缸和水平油缸的等效刚度建立了动力稳定装置动态特性键合图模型.使用分段函数表达式实现了轮轨间的间隙传动.针对不同夹持力对于能量的传递效率与作业效果进行了深入分析与探究,确定了所需最小的水平油缸的推力.     

浅谈学报编辑的创新意识

阐述创新意识的内涵、创新意识的重要性及意义，提出具有创新意识的编辑，必须从学新、查新、更新、创新4个方面努力，才能走创新之路、立创新之业。     

Strategies,Effectiveness and Rationale of Vector-borne Disease Control in the Pastoralist System of South-western Uganda

In Uganda, control of vector-borne diseases is mainly in form of vector control, and chemotherapy. There have been reports that acaricides are being misused in the pastoralist systems in Uganda. This is because of the belief by scientists that intensive application of acaricide is uneconomical and unsustainable particularly in the indigenous cattle. The objective of this study was to investigate the strategies, rationale and effectiveness of vector-borne disease control by pastoralists. To systematically carry out these investigations, a combination of qualitative and quantitative research methods was used, in both the collection and the analysis of data. Cattle keepers were found to control tick-borne diseases (TBDs) mainly through spraying, in contrast with the control of trypanosomosis for which the main method of control was by chemotherapy. The majority of herders applied acaricides weekly and used an acaricide of lower strength than recommended by the manufacturers. They used very little acaricide wash, and spraying was preferred to dipping. Furthermore, pastoralists either treated sick animals themselves or did nothing at all, rather than using veterinary personnel. Oxytetracycline (OTC) was the drug commonly used in the treatment of TBDs. Nevertheless, although pastoralists may not have been following recommended practices in their control of ticks and tick-borne diseases, they were neither wasteful nor uneconomical and their methods appeared to be effective. Trypanosomosis was not a problem either in Sembabule or Mbarara district. Those who used trypanocides were found to use more drugs than were necessary.     

“编辑学者化”三论

“编辑学者化”包括编辑的“学问化”和“专业化”两个方面,这既是从事编辑出版工作的需要,也是编辑工作者提高自身业务素质的正确途径。我们不仅要提倡编辑做好自身的编辑工作,钻研编辑学问,使自己“专业化”,而且要提倡编辑钻研自己所分管学科的学问,使自己“学问化”。     

天山北坡草地遥感分类及其精度分析

基于遥感资料的植被类型划分能快速获得大尺度的植被覆盖变化数据。采用遥感和GIS技术,利用天山北坡典型草地2008年Landsat 5 TM遥感影像和1999年Landsat 7 ETM+全色波段数据,在对遥感影像预处理的基础上,进行了数据融合处理。根据融合影像的纹理特征进行监督分类,将研究区域的植被初步分为8种主要覆盖类型,在监督分类的基础上借助专家知识系统构建决策树,进一步将草地分为5类,包括平原荒漠、平原沙漠、低山荒漠、温性草甸和高寒草甸,最后对分类结果进行精度评价,总精度在95%以上,总Kappa系数为0.939 6,间隔9年的影像融合和决策树分类方法在研究区植被分类中具有较高的可行性。     

SNOMED representation of explanatory knowledge in veterinary clinical pathology

BACKGROUND: The Systematized Nomenclature of Medicine (SNOMED) is an established standard nomenclature for the expression of human and veterinary medical concepts. Nomenclature standards ease sharing of medical information, create common points of understanding, and improve data aggregation and analysis. OBJECTIVES: The objective of this study was to determine whether SNOMED adequately represented concepts relevant to veterinary clinical pathology. METHODS: Concepts were isolated from 3 different types of clinical pathology documents: 1) a textbook (Textbook), 2) the Results sections of industry pathology reports (Findings), and Discussion sections from industry pathology reports (Discussion). Concepts were matched (mapped) by 2 reviewers to semantically-equivalent SNOMED concepts. A quality score of 3 (good match), 2 (problem match), or 1 (no match) was recorded along with the SNOMED hierarchical location of each mapped concept. Results were analyzed using Cohen's Kappa statistic to assess reviewer agreement and chi-square tests to evaluate association between document type and quality score. RESULTS: The percentage of good matches was 48.3% for the Textbook, 45.4% for Findings, and 47.5% for Discussion documents, with no significant difference among documents. Of remaining concepts, 40% were partially expressed by SNOMED and 14% did not match. Mean reviewer agreement on quality score assignments was 76.8%. CONCLUSIONS: Although SNOMED representation of veterinary clinical pathology content was limited, missing and problem concepts were confined to a relatively small area of terminology. This limitation should be addressed in revisions of SNOMED to optimize SNOMED for veterinary clinical pathology applications.