Subjects: Library Science，Information Science >> Information Science submitted time 2023-04-01 Cooperative journals: 《图书情报工作》
Abstract： [Purpose/significance] At the present stage, the data opening of major public health emergencies is faced with many difficulties, such as low public participation, poor data utilization and imperfect platform services. This paper introduces the citizen science mode to build an open service ecosystem, aiming to provide ideas for breaking the deadlock in the development of open data on major public health emergencies.[Method/process] This paper clarified the main elements and implementation processes of citizen science projects in the context of open data on major public health emergencies, and explored the citizen science operation model. On this basis, the study systematically sorted out key elements such as stakeholders, value creation models, constraints and promotion systems. Finally, an open data service ecosystem for major public health emergencies was comprehensively constructed.[Result/conclusion] In this service ecosystem, the citizen science mode is the infrastructure, and the open data platform for major public health emergencies is the key node. By providing all-round service contents, targeted system constraints and promotional mechanisms, this system guides the public, various industry institutions and professionals to interact and cooperate at the levels of macro, meso and micro, integrate their own advantageous resources and carry out service exchange and complementarity, so as to achieve value creation. The results of this paper will help to improve the social participation and utilization of open data, and provide an action reference for the construction of the service system and optimization of the service level of open data platform for major public health emergencies.
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-03-22 Cooperative journals: 《工程热物理学报》
Abstract：分叉管道常见于工程上的流量分配装置、飞行器内外涵道结构，其中分流流道的流动结构影响着主流道的通流量，且回流涡的产生与扩大会引起分流流道的阻塞，使之失去分流的作用。本文采用高速摄影对分流流道内部的流动结构进行识别，发现在其入口处存在明显的回流涡，进而对回流涡处壁面进行了压力动态测量。压力动态测试与高速摄影的结果显示出分流通道中回流涡流场变化的频率信息。在不同的管道入口雷诺数(Rein=80249到179414)下，回流涡处的壁面压力变化具有混沌特性，随着入口雷诺数的增加，压力脉动的幅值增大，而随机性却减小，确定性和稳定性增强，且在回流涡产生位置尤为显著，影响整个分流流道的通流能力。
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