【摘 要】
：
AS a saying goes,“The world’s best wheaten foods are in China,and Shanxi is known for a wide variety of options.”Shanxi Province boasts an extensive and profound culture of making various delicious wheaten foods.Accordingly it has been treated as the land
论文部分内容阅读
AS a saying goes,“The world’s best wheaten foods are in China,and Shanxi is known for a wide variety of options.”Shanxi Province boasts an extensive and profound culture of making various delicious wheaten foods.Accordingly it has been treated as the land
其他文献
“Receiving the letter from Chinese President Xi Jinping is a tremendous honor for global youth leaders,and it reflects the value that he places on international exchange,cooperation,and friendship,”said Erik Nilsson,an American journalist from China Daily
导弹发射后,飞行高度从近地面到高空域,气压、温度变化巨大,同时飞行马赫数也从低速到超声速、高超声速。在不同飞行阶段稳定性能和升阻比需求不同,对导弹气动性能要求不同。固定外形导弹的气动性能难以适用于不同的飞行任务,而可变形翼导弹通过改变翼面的形状,实现外形上的变化,从而适应不同的作战环境。通过分析可变形收缩弹翼不同收缩速度(快速、中速、慢速3种状态)的气动性能,研究了导弹气动性能随弹翼收缩速度变化的规律,揭示了升力系数和阻力系数随弹翼的收缩速率的线性变化特征。同时还分析了变形前后导弹附近流场的压强、速度和温
THE Mogao Grottoes in Dunhuang,China,began to be built during the reign of Emperor Fu Jian(338-385)of one of the 16 kingdoms in northern China.After construction spanning several dynasties,a sprawling structure was formed,including 735 caves,with 45,000 s
The 2021 China International Fair on Trade in Services(CIFTIS)held last September has drawn worldwide attention.As the largest comprehensive exhibition in the field of global trade in services,the fair sent the world a positive signal for robust recovery
THE global pandemic has not dampened the desire of the international community for exchanges and cooperation.At the 2021 China International Fair for Trade in Services(CIFTIS),foreign exhibitors praised China’s improved business environment and high-quali
针对复杂环境多约束条件下的飞行器末制导问题,提出了一种基于最优控制理论,同时考虑过程约束和终端约束的末制导律设计方法。首先,考虑终端位置、落角和过载需求,基于最优控制理论和Schwartz不等式,建立了过载指令表达式;然后,根据需要对其进行了简化处理,得到了便于应用的表达形式;接着,在建立飞行过载和导引头视角解析表达式并进行分析的基础上,设计了同时考虑过程约束和终端约束的制导参数设计策略;最后,开展了仿真分析,仿真结果表明,所提制导律在满足飞行过程和终端约束的同时,降低了飞行器飞行末段过载需求。
针对多方对抗博弈问题的复杂性和多样性,提出了利用决策树思想对多防御方的目标攻防问题的策略进行决策树分类,再利用决策树分类模型对多防御方的目标攻防问题的攻防策略进行快速决策。首先,对多防御方目标攻防问题利用决策树ID3算法以攻防双方的策略作为类别属性进行分类,得到多防御方目标攻防问题的决策树模型;然后,对多方对抗中的攻击方,基于距离的威胁权重函数得到攻击方的轨迹;最后,得到防御方的协同合作策略,并进行了仿真验证。
THE 2021 World Winter Sports Expo was an essential part of the special exhibition on sports services of the CIFTIS,which gathered resources of the ice&snow industry from various countries around the world,exhibited cutting-edge technologies and achiev
AT the China International Fair for Trade in Services(CIFTIS)held from September 2 to 7 in Beijing,elements of its vision“green,low-carbon,and environmental protection,”can be seen everywhere.In addition to 15 events advocating the vision,such as the“2021
AS an important part of the modern economic system,emerging industries are a reflection of the scientific and technological strength and economic vitality of China at its new stage of development.As the COVID-19 pandemic continues,China is facing a more c