【摘 要】
：
A press conference of 2021 Blue Book of China Aerospace Science and Technology was held in Beijing on 9th February,2022.According to the Blue Book,CASC will conduct over 50 flights including six manned space flights in 2022 to complete the building of its
论文部分内容阅读
A press conference of 2021 Blue Book of China Aerospace Science and Technology was held in Beijing on 9th February,2022.According to the Blue Book,CASC will conduct over 50 flights including six manned space flights in 2022 to complete the building of its space station and see the maiden flight of LM-6A,the country\'s first carrier rocket powered by solid and liquid engines.
其他文献
目的 探讨荧光定量PCR法鉴定乳及乳制品中骆驼成分,为实现乳及乳制品的动物源性成分鉴别提供依据.方法 利用荧光定量聚合酶链式反应(real-time Fluorescent Quantitative Polymerase Chain Reaction,FQ-PCR)的方法构建了乳及乳制品中骆驼成分检测方法,设计了内参照与骆驼引物探针,对10份市售骆驼乳及乳制品进行调研性实验,检测其牛成分、羊成分及骆驼成分.结果 该方法特异性良好、灵敏度达到10-4 ng/μl,10份市售的骆驼乳及乳制品样本中全部检出骆驼
Common-track constellation is a special kind of constellation,all ground tracks of satellites are in one track.With recursive orbit or quasi-recursive orbit,the ground track of the constellation is a closed loop with a repeating track.In particular,if the
This paper presents a calculation method,and composition of a five-component force test device,to resolve the requirement for solid rocket motor multi-component force test.It compares the difference between two classical algorithms,and summarizes the stru
A fault tolerant control method is proposed in this paper for a turbofan engine gas path degradation through the full flight envelope.A Quantum-behaved Particle Swarm Optimization(QPSO)algorithm is applied to obtain engine inputs adjustments,which contrib
The accurate prediction for aerodynamic drag of spacecraft in very low Earth orbit(VLEO)is a fundamen-tal prerequisite for aerospace missions in VLEO.The present work calculates aerodynamic drag of the Gravity Field and Steady-State Ocean Circulation Expl
目的 了解龙岩市居民吸烟行为及其影响因素,为龙岩市控烟健康教育工作提供依据.方法 采用2020年龙岩市居民健康素养与吸烟行为监测数据,对1484名15～69岁龙岩市常住居民的现在吸烟、每日吸烟进行描述性分析,用Logistic回归分析吸烟行为的相关影响因素.结果 共发放问卷1497份,收回1484份,有效回收率为99.13％;居民现在吸烟率为23.04％(340/1476),每日吸烟率为21.54％(318/1476);男性每日吸烟率为41.99％高于女性0.82％(P＜0.01);15～24岁组每日吸烟
目的 通过对1981-2020年徐州铁路地区新发职业病流行病学调查,了解徐州铁路地区职业病流行特征,为预防控制职业病发生提供科学依据.方法 将1981-2020年新发职业病病例资料信息录入Excel 2017,对其在职业病种类构成、发病趋势、人群特征、高发部门等方面流行特征进行描述性流行病学分析.结果 1981-2020年新发职业病45例,职业病病例呈现逐年下降趋势,职业病种类主要涉及粉尘与化学因素两类职业病危害因素中的尘肺、职业性皮肤病和职业中毒3种,其中尘肺期别为3期:Ⅰ、Ⅱ、Ⅲ期.主要以矽尘为主,其
With the increasing miniaturisation and integration of electronic products and the increase of heat,it is necessary to design and introduce heat sinks and install fans.The volume of electronic components,especially the height,is very important for the str
目的 了解昆山市50岁以上老年人群艾滋病相关知识与行为、艾滋病等疾病感染状况,为制定和完善老年人群艾滋病等重点传染病防控政策提供科学依据.方法 2020年5-7月使用专用调查问卷对昆山花桥镇、周市镇目标人群进行“一对一”问卷调查,并采集血样,开展HIV、HCV、梅毒检测.结果 老年人群艾滋病防治知识知晓率为83.25％(666/800),最近6个月与配偶/男女朋友有性生活者占9.48％(73/770),在与配偶/男女朋友过性生活时从未使用安全套者占24.66％(18/73).老年人群梅毒感染率为0.63％
目的 了解临床医学和预防医学专业学生体质指数和营养知识、态度、饮食行为现状,为有针对性地开展营养健康教育和促进其体质健康提供依据.方法 2019年4月,选择沈阳医学院大三年级临床医学和预防医学专业630名学生为调查对象进行问卷调查.结果 630名大学生中,体质指数(BMI)正常者占59.21％(373/630),消瘦、超重和肥胖占比分别为13.33％(84/630)、18.89％(119/630)、8.57％(54/630);女生消瘦和正常比例(15.52％,63.30％)高于男生(9.38％、51.85