Exploration of the Dynamic Evolution of Online Public Opinion towards Waste Classification in Shanghai.

Shanghai is one of the fastest-growing metropolises and the first city in China to implement mandatory waste classification. Waste classification policy of Shanghai has attracted widespread attention since its implementation in July 2019. However, previous papers have not focused on online public attitudes surrounding the implementation of a waste classification policy in Shanghai. In order to fill this gap, this paper explored the dynamic evolution of online public attitudes towards waste classification in Shanghai by using sentiment analysis technology and topic modeling technology. It was found that the proportion of negative posts each month was about 20%; therefore, online public sentiment towards waste classification in Shanghai was generally positive. Compared with the first three months of policy implementation, the public sentiment towards Shanghai's waste classification became more positive, with the exception of two special periods. Negative posts in July 2019 mainly discussed waste's environmental hazards and policy provisions. New topics in negative posts in later months focused on some specific problems, including the process of throwing away wet waste, the allocated throwing times, the number of waste cans, takeaway meal disposal, and gathering activities. Improving the factors causing the negative sentiments in the posts will help the government better implement the policy. The paper will help the government to receive higher public support for the waste classification policy in Shanghai. The present findings also have great reference significance for other cities.

Memory Impairment Due to a Small Acute Infarction of the Columns of the Fornix.

BACKGROUND: Clinically infarction of the columns of the fornix is very rare. It is also easy to be overlooked during imaging examination due to the special anatomical localization and features of columns of the fornix. In the meantime, with memory disorder to be its most prominent manifestation, it is very easily false diagnosed as other diseases when the lesion focus is overlooked, causing unnecessary invasive examinations like cerebrospinal fluid tests. METHODS: Case report and Literature review. RESULTS: We presented a 66-year-old woman with memory impairment due to a small acute infarction of the columns of the fornix. Through her diagnosis and treatment, we believed that early diagnosis and treatment were important to these patients who were enduring the disease. In addition, literature review informed us that for those unwilling to undergo cerebral angiography or for small cerebrovascular lesions that cannot be detected by angiography, 7T magnetic resonance imaging (MRI) might be an ideal diagnostic method. CONCLUSION: This case illustrated the significance of MRI in diagnosis for patients with acute memory impairment. When reading MRI results, one needs to pay attention to identify small lesions at special locations. In addition, cerebral apoplexy is still the first consideration of diagnosis when acute memory impairment occurs in patients with cerebrovascular disease risk factors.