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We prove an interior L p -estimate of X-gradient of weak solutions to a class of quasilinear subelliptic equations with VMO coefficients under controllable growth. Here, we use a reverse Hölder inequality and De Giorgi's iteration to establish the boundedness of their weak solutions. Then a local L p -estimate of the X-gradient of the weak solutions is derived by way of the bootstrap argument. MSC: 35J50; 35J47

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Wireless communication plays an important role in high speed railway (HSR) system. As air interface is open, EMI radiation is of significance to HSR wireless communication. This work analyzes current EMI radiation within HSR system firstly, and concludes that main EMI radiation is caused by discharge of Pantograph-offline on EMU. Then on the basis of theoretical models of such discharge, which reflects the physical characteristics of offline signal directly, transient far field radiation model is established and analyzed. Consequently the far field radiation is simulated to verify theoretical model. Results show that, for common wireless communications, such as GSM, LTE and so on, the EMI radiation should be considered in radiation EMS tests for HSR wireless equipments. Index Terms-HSR; EMI Radiation; Discharge of Pantograph offline;Yinghong WEN, PHD., and professor, is with School of Electronic Information Engineering, Beijing jiaotong University, Beijing, china. And her major researches are focused on EMC within HSR.

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