一、疫苗可预防疾病最多发病例数和目前情况比较(美国)

In lecture D28, we derived three basic relationships embodying Kepler's laws: Equation for the orbit trajectory

Lecture D33: Forced Vibration Fosinwt m Spring Force Fs =-kx, k>0 Dashpot Fd =-ci, c>0 Forcing Fext Fo sin wt Newton's Second Law (mix =CF) mx+cx+kx= Fo sin wt =k/m,=c/(2mwn)

雕塑的高峰在唐,起于六朝;而绘画高峰则在 宋,源头也在六朝,其“隐逸”的生活方式,直 接影响山水诗画的艺术趣味和审美观念,并具 有深远的人民性和普遍性,掩盖了人间真痛苦 ,显示了世俗理想画面 禅宗从中晚唐到北宋愈益派别。禅宗教义与中 国传统的老庄哲学对自然态度有相近之处,它 们都采取了一种准泛神论的亲近立场,要求自 身与自然合为一体,它们构成了中国山水画发 展成熟的思想条件

一、当理性精神遍布北中国之时,南中国弥漫在奇异的神话世界之中,在文艺审美领域,这就是以屈原为代表的楚文化。 二、蕴藏着原始活力的传统浪漫幻想,始终没有离开汉代艺术。而表现在运动、气势和古拙的艺术风格上---术的文化体系

一、斯威齐模型 二、也称为折弯需求曲线模型。 三、由美国经济学家斯威齐于1939年提出。 四、用于解释一些寡头市场上的价格刚性现象

Lecture D34 Coupled Oscillators Spring-Mass System(Undamped/Unforced)

Lecture D32: Damped Free Vibration Spring-Dashpot-Mass System k Spring Force Fs =-kx, k>0 Dashpot Fd =-cx, c>0 Newton's Second Law (mx =EF) mx +cx+kx (Define)Natural Frequency wn=k/m,and

Solution General solution x(t)= A cos wnt +B sin wnt or, x(t)=Csin(wnt+φ) Initial conditions

When the only force acting on a particle is always directed to- wards a fixed point, the motion is called central force motion. This type of motion is particularly relevant when studying the orbital movement of planets and satellites. The laws which gov- ern this motion were first postulated by Kepler and deduced from observation. In this lecture, we will see that these laws are a con- sequence of Newton's second law. An understanding of central