With the continuously upgrading of 3 Dimensional drawing software, many new theories on lighting application have been put forward in the past few years with increase drawing capability in general.

The Research on the New Method of Graphical Solution and Three Dimensional Drawing in Descriptive Geometry Under the Circumstance of AutoCAD

AutoCAD环境下画法几何图解与三维绘图新方法的研讨

A method to build dimensioning model of 2 dimensional drawing based on undirected graph is presented.

提出了一种基于图结构描述的二维图形尺寸标注模型的建立及存储方法。

The Study of Building Parametric Standard Part Lib in Two dimensional Drawing Based on Automatic Identification

建立基于自动识别的二维参数化标准件库方法的研究

Simple analysis on how to improve the speed of two dimensional drawing based on AutoCAD

浅析提高AutoCAD二维绘图的速度

Design of Helical Blade Die for Concrete Mixing Truck With Three Dimensional Method

三维法设计混凝土搅拌车螺旋叶片压模

Acquisition of Damage Response Function Based on Optimal Design and Dimensional Method

基于量纲分析和最优设计的毁伤响应函数获取

Purpose To compare two dimensional method ( 2D) and three dimensional method ( 3D) with spiral CT for measurement of femoral neck anteversion ( FNA).

目的研究比较螺旋CT二维法和三维法在小儿股骨颈前倾角（FNA）测量中的应用价值。

In this paper, the authors study the properties of hyperbolic Euler for-mula of Two-dimension, the four-dimensional hyperbolic Euler formula is put upin the domain timelike of four-dimensional hyperbolic complex space.

本文考察了二维双曲Euler公式的若干性质，在四维双曲复空间的拟时区建立了四维双曲Euler公式。

N-dimensional Hyperbolic Euler Formula

n维双曲Euler公式

Based on Lorentz ′ s three dimensional power formula, an equation is formulated of movement of four dimensional electric charge in electromagnetic field for the formula to better describe the movement of electric charge under the theory of relativity.

本文从三度形式的洛仑兹力公式出发，推导出四度形式的电荷在电磁场中的运动方程，使洛仑兹力公式能够在相对论情况下很好地描述电荷的运动情况。

The inertia theorem of the quadratic form was conventionally proved by applying the theory of a set of linear equations ( see ( 1) p.214), or by using the dimensional formula of subspace ( see ( 2) p.335).

二次型的惯性定理通常用线性方程组理论（参见（1）P.214）或用子空间维数公式（参见（2）P.335）加以证明。

This paper gives a formula of calculating the dimension of quotient space at first, based on the result, applies homomorphic theorem and isomorphic theorem I to vector space, and then gains a simple proof of dimensional formula and Sylvester theorem respectively.

本文建立了商向量空间的维数公式，在此基础上，应用同态基本定理和第一同构定理获得了对维数公式及Sylvester定理的简单、明了的证明。

Objective To compare the accuracy of output factor calculation for rectangular inserts of electron beams by using three kinds of algorisms: square root, one dimensional formula and area periphery ration.

目的比较方根式、一维式和面积周长比3种方法计算的电子束矩形照射野输出因子的精确性和可行性。

Barnsley et al. got a dimensional formula of recurrent Fi F in the condition that the connection matrix is irreducible.

Barnsley等在关联矩阵不可约的条件下，得到了递归FIF的分形维数公式。

The resulted sound casting shown that the foundry processes were successful by which dimensional accuracy and sound internal quality can be ensured.

实践证明，这种铸造方法能保证外部形状和内部品质；

At last, the cases of three dimensional surrounding sound systems with cube array and triangular pyramid array models by using these formulas are illustrated for example in this paper.

文中导出了正方排列和正三角梭锥（正四面体）排列两种型式的三维（立体）声系统作为这组公式应用之例。

Calculation of three dimensional steady sound radiation of vibration objects with spline boundary element method

用样条边界元计算振动体的三维稳态声辐射

A mathematical analysis of three dimensional surrounding sound field

三维（立体）声场的数学分析

Based on H ∞ control theory, the feedforward Active Noise Control ( ANC) model of one dimensional sound field in a duct is presented. The design problem of feedforward controller is transformed into the standard problem of H ∞ control.

本文运用H∞控制理论建立管道内一维声场的前馈式噪声主动控制模型，将前馈控制器设计问题转化为标准的H∞控制问题。

In this paper, the two dimensional sound field is analysised by boundary element method and numerical formulars are brought out after three different procedures are compared.

本文将边界元法应用于二维声场分析，给出了以第二类汉克尔函数为基本解的数值计算公式，比较了处理奇异积分的三种不同方法。