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Zhigang Hu Wencan Tian Shenmeng Xu Chunbo Zhang Xianwen Wang 《Journal of Informetrics》2018,12(4):1133-1145
InCites Essential Science Indicators is becoming increasingly used to identify top-performing research and evaluate the impact of institutes. Unfortunately, our study shows that ESI indicators, as well as other normalized citation indicators, have the following flaws. First, the publication month and the online-to-print delay affect a paper’s probability of becoming a Highly Cited Paper (HCP). Papers published in the earlier months of the year are more likely to accumulate enough citation counts to rank at the top 1% compared with those published in later months of the year. Papers with longer online-to-print delays have an apparent advantage for being selected as HCPs. Research field normalizations lead to the third pitfall. Different research fields have different citation thresholds for HCPs, making research field classification important for a journal. In addition, the uniform thresholds for both articles and reviews in ESI affect the reliability of HCP selection because, on average, reviews tend to have higher citation rates than articles. ESI’s selection of HCPs provides an intuitive feel for the problems of normalized citation impact indicators, such as those provided in InCites and SciVal. 相似文献
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周绍平 《江苏广播电视大学学报》2005,16(6):58-60
单片机开发应用中经常用到延时控制，延时控制的基本方法有纯软件、纯硬件及软硬件结合方法，它们都有各自的特点及应用范围，以1秒延时为例给出用三种方法实现的过程，并介绍了软硬件结合延时的应用实例。 相似文献
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Mary Anne Ullery Antonio Gonzalez Lynne Katz 《International Journal of Disability, Development & Education》2016,63(4):403-418
This study explores the long-term impact on participation in the Linda Ray Intervention Program (LRIP) for children (n = 54) who were developmentally delayed and prenatally exposed to cocaine. By identifying a group of programme graduates from a high crime/high poverty neighbourhood in Miami-Dade County using ArcGIS 10.2 software, a quasi-experimental design was used to compare children living in this area who participated in the centre-based modality (5 h a day; 5 days a week) to children living in this area who participated in the home-based modality (3 h per week) on their Florida Comprehensive Assessment Test (FCAT) reading and math scale scores in public school. The children who participated in the centre-based modality reported stronger outcomes in both math and reading FCAT scale scores at the p < .05 level and also out-performed their school-age peers on both math and reading FCAT scores at the p < .05 level. 相似文献
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Jon Zabala Borja González-Albo Ana García-García Aurora Garrido-Domínguez José Ignacio Vidal-Liy Luis R. Álvarez-Díez Soledad Hernando-Tundidor Yara Mostazo-Fernández Teresa Abejón 《Learned Publishing》2023,36(2):205-216
This article analyses the review, acceptance and publication dates of a sample of 21,890 articles from 326 Ibero-American scientific journals from all subject areas and countries included in the Latindex Catalogue 2.0 and published between 2018 and 2020 (freely available as an open access dataset). The aim is to discover evaluation and publication times. The evaluation process takes a median of 110 days, the publication process, a median of 82 days, and the whole process, a median of 224 days. Statistical differences are found according to periodicity, subject areas, countries, existence of a printed version and article type (Call for Papers or General articles). From the data we find that the delay in publication is longer than publishers themselves report to the DOAJ. STEM areas present the most similarity in publication patterns, having a higher number of evaluation days (Ed) than publication days (Pd); Arts and Humanities present the opposite pattern, with a higher Pd than Ed. In the case of Social Sciences, the times are similar. General articles and Call for Papers articles differ in terms of Ed, but not Pd, indicating that Call for Papers revisions are faster. 相似文献
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通过讨论一类含CTL免疫应答的具分布时滞的HIV感染模型,分析了在分布时滞情况下未感染平衡点及感染无免疫平衡点的全局渐近稳定性,并给出了感染免疫平衡点局部渐近稳定的充分条件。 相似文献
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选定3类特征度量分析网络,通过问卷调查筛选关键节点,精简网络模型,阐释复杂项目组织同步的路径,以杭州市轨道交通4号线一期工程作为实例,利用Net Miner可视化网络模型,提出应对工程延误的组织同步的有效策略。 相似文献
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本文以乘客出行需求和出行安全为最终目标,研究城市轨道交通在列车延误时,综合考虑线路运输条件、客流分布特点、站点客运组织条件、列车延误时间与地点等各项因素下,采取本线线路或邻线（换乘线路）行车调整（如越站、扣车、加车、变更行车交路等）,提出配套的客流组织措施（客流限流措施、服务补救等）进行综合保障,以提升运输服务水平。 相似文献
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在城市道路交通网络中，延误是确定路段行程时间的一个主要因素，结合我国国情，在进行交通诱导研究中提出了一种延误模型设计思想，并在模型中反映出非机动车对机动车的影响，从而得到了同一进路不同前进方向决定的行程时间函数。 相似文献