Engineering multimode resonances for tunable multifrequency superscattering.

We demonstrate a rigorous multimode engineering method to achieve multifrequency superscattering with flexible controllability in a subwavelength graphene/hexagonal boron nitride (hBN) cylindrical system. Through delicately tuning the chemical potential of graphene, different resonance channels of the proposed stucture can be spectrally overlapped to construct the multiple superscattering points. Consequently, the scattering cross section is enhanced effectively and the so-called superscattering beyond the single-channel scattering limit can be attained. Numerical calculations on scattering spectra, near-field, and far-field distributions are performed to confirm the scattering enhancement. The general principles presented here may suggest an accurate and efficient approach to actively tune the light-matter interaction at the subwavelength scale.

[Hard and soft tissue changes following the treatment of Class II division 1 malocclusion using twin-block appliance].

OBJECTIVE: To investigate the hard and soft tissue changes following the treatment of Class II division 1 malocclusion using Twin-block appliance. METHODS: 50 Class II division 1 malocclusion subjects whose handwrist radiographs were in FG-G stage were selected. One group (27 patients) was treated with Twin-block appliance, the other group (23 patients) was observed without treatment The acquired data of cephalometric of two groups were analyzed statistically with SPSS 11.0. RESULTS: Soft tissue changes, Ls-E, Li-E, U1-Stms, Stms-Stmi, NsLs-FH, LsNsLi, LsNsPg', the angle of H decreased. Sn-Stms, Stmi-Me', Ns-Me', Sn-Me', NsLi-FH, NsPg'-FH, A'Ls-FH, B'Li-FH, LiB' Pg', CmSnLs, GSnPg', the angle of Z increased, there was statistically significant difference (P < 0.05). Hard tissue changes, SNB, L1-NB, IMPA increased, ANB, U1-SN, U1-NA, FMIA decreased, there was statistically significant difference (P < 0.05). CONCLUSION: Sagittal relationship between upper- and lower-jaws is effectively improved after orthopedics with Twin-block appliance. Lower face height increases. Soft tissue profile tends to be straight-styled.

[Soft tissue changes following the treatment of Class II division 1 malocclusion using Headgear-activator appliance].

PURPOSE: To investigate the soft tissue changes following the treatment of Class II division 1 malocclusion using Headgear-activator appliance. METHODS: Fifty Class II division 1 malocclusion subjects who were at peak high velocity on the growth curve were divided into two groups. Standardized lateral cephalogram was taken for each patient in the two groups before and after treatment. SPSS11.0 software package was used to calculate the mean and standard deviation, matched t-test was used to evaluate the changes of the soft tissues. RESULTS: The angle of CmSnLs,LiB'Pg' and Z increased, the angle of H, LsNsLi and LsNsPg' decreased, there was statistically significant difference between the two groups. CONCLUSIONS: Using Headgear-activator appliances, soft tissue profile is effectively improved. Soft tissue chin is moved forward obviously. Lip protrusion is decreased.