Bøker av Yi Zhang

This book provides insights into the wetting behavior on fiber-dressed surfaces and guidelines for developing superhydrophobicity based on electrospinning. In developing superhydrophobicity, electrospinning possesses the following advantages over other fabrication techniques. First, the electrospun micro- and nanofibers, which may also featured with secondary fiber morphology, provide sufficient surface roughness for superhydrophobicity. Second, electrospinning is considered an additive manufacturing technique, so the surfaces to be modified are not destroyed for superhydrophobicity. Third, the introduced electrospun structure is featured with high porosity with inter-fiber pores, allowing for a high vapor transmission rate, which is necessary in many applications such as wound dressing, gas sensor.However, books focused on developing superhydrophobicity using electrospinning are rarely found. Electrospinning is only introduced as one section in most superhydrophobicity-related books, and the mechanism of superhydrophobicity by different electrospinning-based methods lacks detailed explanation.

With the development of the ship industry, the power quality of the ship power system is getting worse and worse. More scholars turn to the detection and improvement of the power system. However, most of the current research focuses on the study of the whole power system, few people pay attention to the source of the power quality problem. The nonlinear load is one of the most important factors to affect the quality of the ship's power. This paper does some study on the power quality of the frequency conversion system¿introduces the harm caused by the electric power quality of the frequency conversion system of the ship, and analyzes the importance of the power quality detection.in order to improve the speed stability of the generator, the sliding mode control method is studied, and the convergence law used in the sliding mode controller is improved to address the problem of high convergence speed and low system jitter in the traditional sliding mode control. The convergence law used in the sliding mode controller is improved. Based on the above study, a rectifier vector control strategy for permanent magnet synchronous generator based on the sliding mode control is proposed.

Advancing the Right to Health Care in China analyses the role of accountability, a Western concept that has recently been introduced to China, in advancing the right to health care in light of China's unique political, legal and social background.