The common structures of scientific and technological articles can be generally classified into four types: parallel structure, series structure, umbrella structure and mixed structure.

parallel structure

The selected materials are arranged, and there is no logical restriction between material units. Even if the arrangement order of the materials is changed, the expression effect will not be affected.

[example]

Study on current limited by intermediate charge in resonant cavity;

Ribbon beam in 1. short resonator;

2. Solid beam in cylindrical resonator.

(Note: If 1 material unit is interchanged with the second material unit, the expression effect of the article will not be affected. )

(2) Series structure

The selected materials are arranged in sequence, and there is a sequential logical relationship between material units, which cannot be interchanged at will.

The most basic form of string structure is restricted string structure, and its mode is as follows:

A 1？ A2？ A3？ An (that is, if there is no A 1, there is no A2, and so on. )

[example]

Calculation and analysis of forward current-voltage characteristics of silicon P+i n+ junction;

Carrier concentration in 1.i region

N(x)= (omitted) (1)

2. Forward pressure drop in zone I

The electric field distribution in the I region can be obtained from the formula (1).

E(x)= (omitted) (2)

So the pressure drop in region I

(3) Section 1 [Formula (1)] has no conclusion, that is, there is no subsequent derivation and result [Formula (3)].

In addition to the restricted string structure mode, there are increasing (or decreasing) string structure and time series structure. The former can give people a gradual sense of rhythm through the orderly arrangement of material units; The latter can be expressed in the order of time and space, giving people a clear sense of hierarchy.

(3) Umbrella structure

This structure refers to a structure in which arguments at a certain level are supported by two or more arguments, that is, only two or more material units at the same level can be established at the same time, and the material units at the next level can be established. Its schematic diagram is shown in Figure 2-5.

[example]

It is proved that the sum of three internal angles of an arbitrary triangle is 180 degrees.

The above is a single-layer umbrella structure, and there are also multi-layer umbrella structures, the schematic diagram of which is shown in Figure 2-6.

(a 1) The sum of the three internal angles of an acute triangle is 180o.

(a2) The sum of three internal angles of an obtuse triangle is 180o, and the sum of three internal angles of an arbitrary triangle is 180o.

(a3) The sum of the three internal angles of a right triangle is 180o.

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