第一节 饲养标准 一、概念 三、应用 二、内容 第二节 营养需要量的研究方法 一、衡量需要量的指标 二、研究方法

In this lecture, we will particularize the conservation principles presented in the previous lecture to the case in which the system of particles considered is a 2D rigid body. Mass Moment of Inertia In the previous lecture, we established that the angular momentum of a system of particles relative to the center of mass, G, was

In this lecture, we will revisit the application of Newton's second law to a system of particles and derive some useful relationships expressing the conservation of angular momentum. Center of Mass Consider a system made up of n particles. A typical particle, i, has mass mi, and, at the instant considered, occupies the position Ti relative to a frame xyz. We can then define the center of mass, G, as the point

In this lecture, we will start from the general relative motion concepts introduced in lectures D11 and D12. and then apply them to describe the motion of 2D rigid bodies. We will think of a rigid body as a system of particles in which the distance between any two particles stays constant. The term 2-dimensional implies that particles move in parallel planes. This includes, for instance, a planar body moving within its plane

1.矿物元素的分类及其一般生理功能。 2.矿物元素营养价值的评定方法。 3.电解质平衡的概念与应用。 4.主要矿物元素的一般营养生理功能及其典型 缺乏症

Inertial reference frames In the previous lecture, we derived an expression that related the accelerations observed using two reference frames, A and B, which are in relative motion with respect to each other. aA =aB+(aA/ B)'y'' 22 x (DA/ B) 'y'2'+ TA/B+ X TA/B). (1) Here, aA is the acceleration of particle A observed by one observer, and

根据特定的育种目标，制定出在多项育种措施 上具有不同强度的候选育种方案，通过育种成 效标准，如综合遗传进展、育种效益等，进行 综合评估，应用系统工程的方法，科学有效地 配置资源、技术、方法和措施，筛选出“最优 化”（optimization）育种方案

In the previous lecture, we related the motion experienced by two observers in relative translational motion with respect to each other. In this lecture we will extend this relation to our third type of observer.That is, observers who accelerate and rotate with respect to each other. As a matter of illustration, let us consider a very simple situation, in which a particle at rest with respect

So far we have used Newton's second law= ma to establish the instantaneous relation between the sum of the forces acting on a particle and the acceleration of that particle. Once the acceleration is known,the velocity (or position) is obtained by integrating the expression of the acceleration (or velocity). There are two situations in which the cumulative effects of unbalanced forces acting on a particle are of interest to us. These involve:

水对养分的消化、吸收、转运、废物排泄有着重要的作用。 水是最廉价、最容易得到、也是最容易被忽略的重要养分