Microbial fuel cells (MFCs) are devices that use bacteria as the catalysts to oxidize organic and inorganic matter and generate current whereas microbial electrolysis cells (MECs) are a reactor for biohydrogen production by combining MFC and electrolysis. In an MEC, an external voltage must be applied to overcome the thermodynamic barrier. Here we report an MEC-MFC-coupled system for biohydrogen production from acetate, in which hydrogen was produced in an MEC and the extra power was supplied by an MFC. In this coupled system, hydrogen was produced from acetate without external electric power supply. At 10 mM of phosphate buffer, the hydrogen production rate reached 2.2 +/- 0.2 mL L(-1) d(-1), the cathodic hydrogen recovery (RH2) and overall systemic Coulombic efficiency (CEsys) were 88 to approximately 96% and 28 to approximately 33%, respectively, and the overall systemic hydrogen yield (Y(sysH2)) peaked at 1.21 mol-H2 mol-acetate(-1). The hydrogen production was elevated by increasing the phosphate buffer concentration, and the highest hydrogen production rate of 14.9 +/- 0.4 mL L(-1) d(-1) and Y(sysH2) of 1.60 +/- 0.08 mol-H2 mol-acetate(-1) were achieved at 100 mM of phosphate buffer. The performance of the MEC and the MFC was influenced by each other. This MEC-MFC-coupled system has a potential for biohydrogen production from wastes, and provides an effective way for in situ utilization of the power generated from MFCs.

Table tennis has a broad mass base in our country and is a sport suitable for all ages. It has achieved outstanding results in the international arena and has become our country’s traditional advantage. To engage in professional table tennis, table tennis players are required to have good physical quality. However, table tennis is actually a high-intensity, high-skills sport. It has a very large impact on the main power-generating parts and joints of the athlete’s body. Soldiers and ball players often suffer from sports injuries. Therefore, it is necessary to carry out the nutrition corresponding supplements and targeted training. Therefore, the experimental group members were supplemented with nutritious food to distinguish the control group. The operation steps and experimental principle of this method are provided in detail in this article. Based on the above test scheme, a comparative experiment has been done and a number of physiological tests on the two groups of sports have been carried out. It includes the statistical analysis of athletes’ body composition changes after the experiment and the comparative analysis of body composition before and after nutrition intervention in the experimental group. Analysis of experimental data shows that nutritional food can improve the physical indicators of table tennis players and enhance the overall health evaluation coefficient.

Multimedia technology and network technology have been rapidly developed. Embedded Micro Processor Unit (MPU) is a processor with a data width of more than 32 bits, which has relatively high performance and high price. Different from the traditional general-purpose computer, due to the limitation of system size and power consumption, the embedded microprocessor only retains related functions. Embedded processors currently mainly include Am186/88, PowerPC, MIPS, ARM, and other mainstream series, among which ARM occupies the main market share. Computer-Aided Instruction (CAI) is a variety of teaching activities carried out under the assistance of computers, discussing the teaching content. The implementation of computer-assisted teaching has followed the pace of China’s education system reform. As far as teaching is concerned, it has not only caused changes in the environment and teaching methods, but most importantly, it has brought about the renewal of educational thoughts and concepts, especially a series of changes in the educational system, methods, and content. This article is based on educational theory, educational planning theory, and educational psychology theory, starting from the integration of network multimedia and table tennis course learning, grasping the teaching characteristics of table tennis course, doing detailed demand analysis and system design, and making full use of advanced information technology that has created a table tennis multimedia network teaching platform. This article discusses the design, development, and application research of the network multimedia table tennis teaching system based on the embedded microprocessor through teaching experiments. Based on the network multimedia table tennis, the network multimedia teaching, extension of the system to other physical education teaching provides suggestions and references and explores the future development direction of the network multimedia teaching system through teaching methods. The experiment proves that each test score of the experimental group is tested by a pair of samples, indicating that the application of the platform increases the communication channels and knowledge acquisition; the method facilitates the management of teachers in teaching and improves the degree of informatization of course teaching.