Physicochemical Properties of Musk Deer Pneumonia and Purulent Disease Viruses

[ Objective] To understand the physicochemical properties of musk deer pneumonia and purulent disease viruses. [ Method] The pneu- monia and purulent disease viruses were isolated from the abnormal and purulent lung tissues of musk deer. Then the isolated viruses were inocula- ted into the Vero cells. After culturing, the virus solution was collected and used to determine TCID50 and genoma types. The sensitivity to fat sol- vent, resistance to hydrochloric acid and trypsin as well as tolerance to heat of the musk deer pneumonia and purulent disease viruses were detec- ted, respectively. [ Result] The obvious cytopathic effects （CPE） were found in Veto cells infected by the isolated viruses. The virus was 2-1.43 TCID50/ml and its genome was RNA. The virus was not sensitive to chloroform, 1% trypsin and heats, and it had a certain tolerance to 0.1 mol/L hy- drochloric acid. [ Conclusion] The study on the physicochemical properties of musk deer pneumonia and purulent disease viruses lays a foundation for prevention and control of the musk deer pneumonia and purulent diseases.

高空长航时无人机用发动机推力需求及技术特点分析

区别于常规涡扇发动机设计,高空长航时无人机发动机受高空环境影响显著,在设计中要充分考虑其工作特点并进行适应性设计。以“全球鹰”无人机为对象,建立了高空长航时无人机及其动力性能需求计算模型。基于典型任务剖面,分析了无人机在起飞、爬升、巡航等典型任务阶段的推力需求,研究了关键敏感性参数对发动机推力需求的影响规律,提出了降低发动机研发难度的有效建议,并结合AE3007H发动机的设计特点,深入分析了高空长航时无人机动力特性。