This paper proposes a new method for sizing and optimizing CMOS cell circuit.

The SRAM basic storage cell was discussed,and the basic principles and design rules of SRAM cell circuit were described.

This method has already been used in the imitation procession of the unit circuit board.

Aiming at the characteristics of electronic specialty,the reform of curriculum content of simulation electronic technology should stand out the core status of unit circuit,pay attention to the training of electronic skills,increase new theoretic content,carry out the reform of practice training which take the enhancement of student′ comprehensive skills as the aim.

Full adder is a base unit circuit of IC chip.

Furthermore, a new circuit unit is proposed to realize the fractional-order chaotic system.

In order to simplify the work of pre-process in finite element analysis of large scale bolted rock discontinuities,a combined element model of bolted rock discontinuities is presented based on the displacement interpolation function of discontinuity element and the stiffness matrix of bolt element.

Since pre-stressed concrete box girders usually have a large number of curve pre-stressed tendons,a type of combined element is presented to simulate the prestressed tendons of box girders,and then the number of elements can be significantly reduced.

Through contrastive analysis of calculated value and test data, it is proven feasible and correct to use composite element and externally prestressed element together to analyze externally prestressed concrete structure, while providing support and experience to the numerical simulation in bridge structure.

To analyze the performance of reinforced concrete structures numerically, the composite element is developed, which inherits and expands the features of the original isoparametric element, and can consider contributions of concrete and steel to the element stiffness separately.

Based on the composite element,3D model of concrete creep is created firstly.