dynamic characteristics
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2022 ◽  
Vol 169 ◽  
pp. 108736
Pengfei Wang ◽  
Hongyang Xu ◽  
Hui Ma ◽  
Hongzheng Han ◽  
Yang Yang

2022 ◽  
Vol 12 (4) ◽  
pp. 778-787
Jiang-Hong An ◽  
Fu-Rong Qi ◽  
Xiao-Ya Cheng ◽  
Xun-Qi Liu ◽  
Pu Luo ◽  

Background and purpose: Coronavirus disease 2019 (COVID-19) was spreading all over the world. Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) primarily invades and infects the lungs of humans leading to COVID-19. Mild to severe clinical symptoms such as fever, cough, and shortness of breath were existed in those patients. One of the most common changes in these patients was abnormal blood routine. However, uncertainty remains regarding the dynamic characteristics of platelet in COVID-19 patients due to limited data. Therefore, we aimed to analyze the association between dynamic characteristics of blood platelet and disease severity, and to identify new monitoring indicators to treat the COVID-19 patients. Methods: In this cohort study, 398 COVID-19 patients treated in the Shenzhen Third People’s hospital from December 16, 2019 to March 26, 2020 were collected and participated. All data of participants including the clinical characteristics, imaging and laboratory information were collected. All patients included in our study were classified as four groups (mild, common, severe, and critical types) regarding clinical symptoms and relevant severe failures based on the Diagnosis Criteria. Platelet count was examined at the baseline and every 3–5 days during hospitalization. Results: The platelet count varied with clinical classifications. The platelet count in mild type was normal without significant fluctuation. While the blood platelet count of most common and severe patients had obvious fluctuations, showing as a dynamic change that first rose and then fell to the level at admission, which was consistent with the trend of lung inflammation. Bone marrow smears further showed that bone marrow hyperplasia was normal in mild, common and severe type patients, and megakaryocytes and their platelet-producing functions were not abnormal. Conclusions: Our results suggested that the dynamic changes of platelet count might be a predictor of lung inflammation alteration for COVID-19 patients. The changes in platelet count might be a responsive pattern secondary to lung inflammation. The function of bone marrow may be slightly affected by SARS-CoV-2 infection.

2022 ◽  
Vol 166 ◽  
pp. 108802
Jiang Lai ◽  
Lingling Lu ◽  
Shihao Yang ◽  
Tiancai Tan ◽  
Lei Sun

2022 ◽  
Vol 1 (1) ◽  
pp. 56-62
Vladimir Volkov ◽  
Evgenii Lebedev ◽  
Elena Nabatnikova

The analysis of changes in the dynamic characteristics of the transport operation of a trunk road train in road conditions with overcoming sections of obstructed traffic characterized by the presence of steep ascents is considered. The solution of the problem under consideration is presented in the variants of determining the maximum angle of elevation of the road that can be overcome by a road train with the specified operational characteristics and the cost of engine power spent on overcoming these road sections.

Annals of GIS ◽  
2022 ◽  
pp. 1-12
Ci Song ◽  
Tao Pei ◽  
Xi Wang ◽  
Yaxi Liu ◽  
Jia Ma ◽  

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