Considering the characteristics of lower power resources in multi-point wireless body area networks (WBANs), the wireless energy and information transmission in full duplex (FD) mode is considered. We propose a transmission protocol based on time division multiple access, which includes two phases. In the inactive phase, the signal access point (AP) broadcasts Radio Frequency (RF) energy to the sensors. When the energy collected by all sensors reaches their respective energy thresholds, the active phase will start. In the active phase, the sensors send back the collected physiological information parameters to the AP, while sensors still collecting the energy transmitted from the AP to achieve the purpose of energy accumulating. Our goal is to obtain the optimal time allocation ratio through the joint objective linear programming method to obtain the maximum average sum-throughput. The simulation results compared with the AP with FD and the sensors with half duplex (HD) show that our proposed optimization method can improve system throughput obviously. INDEX TERMS Wireless body area network (WBAN), energy harvest, energy and information transfer, full duplex (FD), half duplex (HD), linear programming method.
The research on nanomaterials has been attracting more attention in recent years. At the same time, with the advancement of human development and social industrialization, traditional energy sources such as oil, natural gas, and coal, which are closely related to human beings, are decreasing day by day, and the resulting environmental pollution is becoming more and more serious, which threatens the sustainable development of human beings. The world is transforming from traditional cars to electric vehicles to realize a sustainable development strategy and protect the natural environment and resources. This article can be divided into three parts, focusing on nanomaterials' applications in electric automobiles. Firstly, the materials used on the car frame, such as aluminium alloys and steel, are introduced and compared. Then, the superhydrophobic coatings with fascinating self-cleaning and corrosion-resistant performance on these substrates are discussed. In the end, the latest discoveries of new battery materials are listed, and some potential research areas in the future and perspectives on these technologies are given out.
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