The commentary addresses the government’s role in mitigating information asymmetry problems during pandemic crisis response. We use the outbreak of COVID-19 in Wuhan, China, as a case to show the use of social media as a key mechanism in shaping the actions of the central government in its coordination with the local governments during the pandemic response. The Chinese government effectively collaborated with a social media platform to not only create a dedicated channel to allow citizens to post information about the pandemic to accelerate the speed of relief but also mobilize citizens and nonprofit organizations to support government response and recovery efforts. This suggests that social media can provide a venue for the government to not only tackle the information overload but also mitigate the friction among levels of governments.

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In this paper, the flow ripple equation is derived to analyze the effect of working condition on pressure pulsations of an internal gear pump. Results indicate that working pressure has a significant effect on pressure fluctuation of the internal gear pump, while the rotating speed has a complex influence on the pressure pulsation behavior. Then, pressure pulsations of the internal gear pump under different working conditions are discussed by experimental investigations. Results show that the internal gear pump taken for analysis has a low-pressure pulsation at a high working pressure and a relatively high rotational speed. Regarding the frequency spectrum of the pressure pulsation, the dominant frequency is Z* fn, i.e. the product of the tooth number of the driving gear (gear shaft) and its rotational frequency for many working conditions, caused by the inevitable unsteady discharge process of gear pumps. It transforms to the rotational frequency of the gear shaft ( fn) for a high rotational speed or a high operating pressure, but to the rotating frequency of the internal gear ring (2/3 fn) only for a high operating pressure. The occurrence of the two frequencies (2/3 fn and fn) may result from the deformation of the gear ring and the gear shaft under the unbalanced radial forces caused by a high working pressure. Moreover, the frequency spectrum of the inlet pressure pulsation presents some differences from that of the outlet pressure pulsation. This is because the inlet pressure may be influenced by cavity generated at the suction side of the pump.

A core aspect of agile governance is effectively managing communications between a government and its citizens. However, doing so during an emergencyparticularly a pandemic-is often complex and challenging. In this article, we examine how various levels of the Chinese government (central, provincial, and municipal) communicated with the public in response to the COVID-19 pandemic. Analyzing government social media posts during the COVID-19 outbreak in Wuhan ("text as data"), we conduct topic modeling analysis and identify four strategies that characterize Chinese governments' responses to a variety of issues at the ground level, which we label instructing information, adjusting information, advocacy, and bolstering. The results show that local government agencies predominantly used the first two strategies, whereas the central government mainly relied on the last two. These strategies explain how various levels of government engaged in agile governance through their communication with citizens, highlight the coordination and control work undertaken by governments at all levels, and demonstrate how these methods shielded the central government from blame for the pandemic.