Subjects: Library Science，Information Science >> Library Science submitted time 2023-07-26 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] For now, the construction of domestic citation database had already begun to take shape. In the development of citation knowledge services, the current organization and retrieval methods of scientific literature resources make the current citation knowledge service model unable to reveal the structure or relationship between citations, which caused difficulties for the acquisition, sharing and utilization of citations.[Method/process] This paper took citation data as the research object, acquired and sorted all kinds of knowledge and explored the semantic relationship between citations. Two ontology named "scientific researcher ontology" and "citation knowledge ontology" were constructed, and an ontology-based citation knowledge service prototype system was designed and implemented.[Result/conclusion] Conducts empirical research on the construction of ontology-based citation knowledge service system, The result proves that the ontology-based citation knowledge service system has the expected goals and functions.
Subjects: Astronomy >> Astrophysical processes submitted time 2017-10-20 Cooperative journals: 《天文研究与技术》
Abstract：针对中性大气的物理属性以及大气折射对射电望远镜指向的影响进行了模型分析和计算，以改进型的“三段式”标准指向改正模型为基拙，着重研究了由大气折射造成高阶指向误差的改正方案，目的是不断提高射电望远镜的指向精度，尤其针对大口径、高分辨率的射电望远镜。在此模型的基拙上，模拟南山观测基地的气候特征，给出合理的计算结果。通过分析和评估这些结果与射电望远镜指向精度的要求，为将来大口径射电望远镜的指向修正提供参考
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