4.1图形的开窗 图形的开窗与裁剪是图形观察运算的基础,它们在计算机图形学中占 有非常重要的地位。有了开窗与裁剪这些概念之后,在图形系统的应用中 ,用户定义的各种复杂图形不再受显示设备显示范围的限制,同时又能非 常方便地观察各种图形的输出显示,它使用户可以把图形的输入与图形的 输出两个不同的过程联系在一起

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The work of the external forces in the spring system of the figure is given by W=B*(U1+U2+U3)(2) W=P1*U1+P2米U2+B米U3(3) None of the above statements

The state of stress at a point is completely determined when: 1. the stress vectors on three different planes are specified 2. the stress vectors on two different planes are speciale 3. the stress vectors one arbitrary plane is spec-

not repeated in the same additive term where the index appears. Free means that the index represents all the values in its range Latin indices will range from 1 to, (i,j, k

For the potato-shaped body given in class to explain the concept of stress, the field of stress vectors t(n)=t(n)(x)on the plane of normal n given by its cartesian components(1,0, 0) known and its cartesian components are given by the expression

Concept Question Consider the following simple displacement field

16.21 Techniques of Structural Analysis and sig Spring 2003 Unit #4- Thermodynamics Principles First Law of Thermodynamics