An Approximate Analytical Method for a Slot Ring Radome

In this paper,an in-band and out-of-band microwave wireless power-transmission characteristic analysis of a slot ring radome based on an approximate analytical method is proposed.The main contribution of this paper is that,in the approximate analysis of the ring radome,a unified expression of the incident field on the radome surface is derived with E-plane and H-plane scanning,and the ring is approximated as 30 segments of straight strips.Solving the corresponding 60×60 linear equations yields the electric current distribution along the ring strip.The magnetic current along the complementary slot ring is obtained by duality.Thanks to the fully analytical format of the current distribution,the microwave wireless power-transmission characteristics are efficiently calculated using Munk’s scheme.An example of a slot ring biplanar symmetric hybrid radome is used to verify the accuracy and efficiency of the proposed scheme.The central processing unit(CPU)time is about 690 s using Ansys HFSS software versus 2.82 s for the proposed method.

Removal of trimethoprim and sulfamethoxazole in artificial composite soil treatment systems and diversity of microbial communities

Four artificial composite soil treatment systems(ACSTs)fed with reclaimed water containing trimethoprim(TMP)and sulfamethoxazole(SMX)were constructed to investigate SMX and TMP biodegradation efficiency,ammonia and nitrite removal conditions and the microbial community within ACST layers.Results showed SMX and TMP removal rates could reach 80% and 95%,respectively,and removal rates of ammonia and nitrite could reach 80% and 90%,respectively,in ACSTs.The MiSeq sequencing results showed that microbial community structures of the ACSTs were similar.The dominant microbial community in the adsorption and biodegradation layers of the ACSTs contained Proteobacteria,Chloroflexi,Acidobacteria,Firmicutes,Actinobacteria and Nitrospirae.Firmicutes and Proteobacteria were considerably dominant in the ACST biodegradation layers.The entire experimental results indicated that Nitrosomonadaceae_uncultured,Nitrospira and Bacillus were associated with nitrification processes,while Bacillus and Lactococcus were associated with SMX and TMP removal processes.The findings suggest that ACSTs are appropriate for engineering applications.