In order to investigate the law of electromagnetic propagation within microwave heating system, Maxwell's equations are applied to build electromagnetic model of recycled asphalt mixtures. Energy distribution of electromagnetic field in asphalt mixtures is researched based on the Poynting theory. The optimization model of electromagnetic field and structure are established by building relationship between electric field and magnetic field. Experiments of microwave heating allochroic silicagel are performed, which demonstrates the accuracy of electromagnetic field optimization.
High cycle fatigue experiments were conducted at 600°C to study the effect of manufacture defect on crack initiation behaviour of FGH96. The experiments were performed at different stress levels to considering the coupling effect of loading and defect. The stress ratio was selected at 0.05. The results revealed that the fatigue life behaviour are much different in different loading levels. In order to examine the crack initiation mechanism, Scanning electron microscopy (SEM) method was used to analyze the failure surfaces. Different failure modes including surface cracking, sub surface cracking as well as internal crack initiation were found. The tested fatigue lives were found to have a strong relation with the mode of the crack initiation.
A capacitive deionization system utilizing a pulsed power supply was designed and investigated for desalination. In most studies on capacitive deionization, direct current power supply is the most common power source. Compared with traditional direct-current capacitive deionization, pulsed-capacitive deionization exhibits some excellent properties in desalination: lower power consumption, higher removal rate. The optimal operational conditions of a pulsed power supply in capacitive deionization were discussed in this study. From the experiment results, as for NO 3 of initial concentration 40 mg/L, a duty cycle of 50% and a frequency of 1000 Hz were optimal. From the theory of electrolyte solution, the optimal frequency is related to properties of ion, such as: ionic radius, valence, ion mobility, and also related to the concentration of ion. The results of molecular dynamics simulation were consistent with the experimental results. the reasons for excellent performances of pulsed-capacitive deionization in desalination may be that: the effect of concentration polarization and the migration resistance from solution to the EDL were reduced. Pulsed-capacitive deionization could be used for low concentration water desalination and it provides a new idea for the preparation of ultra pure water and the advanced treatment of wastewater.
For uneven temperature distribution of infrared hot recycling of asphalt mixtures, principle and advantage of microwave hot recycling are introduced. Maxwell's equations are applied to build electromagnetic transmission model of recycled asphalt mixtures. Considering asphalt mixtures as dielectric substance, reflection and refraction of electromagnetic field are researched and model of standing wave ratio is built. Equation of magnetic attenuation is applied to contrast attenuation depths of different pavement materials. The results lay a good theoretical foundation to improve heating efficiency and choose pavement materials.
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