<div style="text-align:justify;"> A high-efficiency ridged magnetically insulated transmission line oscillator (RMILO) is proposed and investigated theoretically and numerically in this paper. In the R...<div style="text-align:justify;"> A high-efficiency ridged magnetically insulated transmission line oscillator (RMILO) is proposed and investigated theoretically and numerically in this paper. In the RMILO, ridge-disk vanes are introduced to enhance the power efficiency. Theoretical investigation shows that the ridge-disk can enhance the coupling impedance of the slow-wave structure (SWS), and so enhance the power efficiency. Moreover, the ridge has a weak influence on frequency, so, it influences little on the tunability of the MILO. In simulation, when the applied voltage is increased to 807 kV, the RMILO can get the 3 dB tunable frequency range with 7.6 - 13.9 GHz and the 3 dB tuning bandwidth with 58.6% which has an increase of 27.6% compared with the conventional MILO. So, the tuning performance of the RMILO is more superior. Besides, the RMILO gets the maximum output power of 7.1 GW, the corresponding power efficiency is 22.6% and the frequency is 1.400 GHz. Furthermore, when the applied voltage is increased to 807 kV, high-power microwave with a power of 13.5 GW, frequency of 1.400 GHz, and ef?ciency of 24.5% is generated, which has an increase of 20.2% compared with the conventional MILO. The simulation results con?rm the ones predicted by theoretical analysis. </div>展开更多
Spherical Sb-doped SnO2 （ATO） nanoparticles were synthesized by the sol-gel route, employing SnCl4.5H2O and SbCl3 as precursors in an ethanol solution. The influences of the calcining temperature and calcining time ...Spherical Sb-doped SnO2 （ATO） nanoparticles were synthesized by the sol-gel route, employing SnCl4.5H2O and SbCl3 as precursors in an ethanol solution. The influences of the calcining temperature and calcining time on the crystallite size, crystallinity, lattice parameters, lattice distortion ratio and the resistivity of the ATO nanoparticles were synthetically investigated. The results suggested that the ATO nanoparticles were crystallized in a tetragonal cassiterite structure of SnO2 with a highly （110）- plane-preferred orientation. The calcining temperature had a dominating effect on the crystallite size, crystallinity, lattice distortion ratios and resistivity of the ATO. As the calcining temperature increased, the average crystallite size increased, the crystallinity was promoted accompanied by a decrease in the lattice distortion ratio and a corresponding decrease in the resistivity of the ATO. X-ray diffraction （XRD） and Fourier transform infrared spectrophotometer （FTIR） analysis revealed that Sb ions could not entirely supplant the Sn ions in the SnO2 lattice for a calcining time of less than 0.5 h, even at a calcining temperature of 1000 ℃. The ATO nanoparticles calcined at 1000 ℃ for 3,0 h possessed the lowest resistivity of 10.18 Ωcm.展开更多
Ionogels is a kind of hybrid materials composed of ionic liquids(ILs)and solid polymer network matrix,has been extensively investigated in the most recent decade.Due to the excellent mechanical properties and ionic co...Ionogels is a kind of hybrid materials composed of ionic liquids(ILs)and solid polymer network matrix,has been extensively investigated in the most recent decade.Due to the excellent mechanical properties and ionic conductivity,their promising applications in flexible stress and strain sensors have been proposed and explosively developed.In this review,we briefly summarize research progresses on ionogel based flexible stress and strain sensors(IFSSs)from five aspects,including material synthesis,device fabrication,working principles,characteristics and performances,and potential applications.Some outlooks and perspectives are also proposed at the end of review.The review is expected to provide reference and new insights into the research of IFSS.展开更多
文摘<div style="text-align:justify;"> A high-efficiency ridged magnetically insulated transmission line oscillator (RMILO) is proposed and investigated theoretically and numerically in this paper. In the RMILO, ridge-disk vanes are introduced to enhance the power efficiency. Theoretical investigation shows that the ridge-disk can enhance the coupling impedance of the slow-wave structure (SWS), and so enhance the power efficiency. Moreover, the ridge has a weak influence on frequency, so, it influences little on the tunability of the MILO. In simulation, when the applied voltage is increased to 807 kV, the RMILO can get the 3 dB tunable frequency range with 7.6 - 13.9 GHz and the 3 dB tuning bandwidth with 58.6% which has an increase of 27.6% compared with the conventional MILO. So, the tuning performance of the RMILO is more superior. Besides, the RMILO gets the maximum output power of 7.1 GW, the corresponding power efficiency is 22.6% and the frequency is 1.400 GHz. Furthermore, when the applied voltage is increased to 807 kV, high-power microwave with a power of 13.5 GW, frequency of 1.400 GHz, and ef?ciency of 24.5% is generated, which has an increase of 20.2% compared with the conventional MILO. The simulation results con?rm the ones predicted by theoretical analysis. </div>
基金the National Natural Science Foundation of China (grant no. 50705094)"Hundred Talents Program" of Chinese Academy of Sciences (grant no.KGCX2-YW-804) for providing financial support
文摘Spherical Sb-doped SnO2 （ATO） nanoparticles were synthesized by the sol-gel route, employing SnCl4.5H2O and SbCl3 as precursors in an ethanol solution. The influences of the calcining temperature and calcining time on the crystallite size, crystallinity, lattice parameters, lattice distortion ratio and the resistivity of the ATO nanoparticles were synthetically investigated. The results suggested that the ATO nanoparticles were crystallized in a tetragonal cassiterite structure of SnO2 with a highly （110）- plane-preferred orientation. The calcining temperature had a dominating effect on the crystallite size, crystallinity, lattice distortion ratios and resistivity of the ATO. As the calcining temperature increased, the average crystallite size increased, the crystallinity was promoted accompanied by a decrease in the lattice distortion ratio and a corresponding decrease in the resistivity of the ATO. X-ray diffraction （XRD） and Fourier transform infrared spectrophotometer （FTIR） analysis revealed that Sb ions could not entirely supplant the Sn ions in the SnO2 lattice for a calcining time of less than 0.5 h, even at a calcining temperature of 1000 ℃. The ATO nanoparticles calcined at 1000 ℃ for 3,0 h possessed the lowest resistivity of 10.18 Ωcm.
基金This work was supported by the National Natural Science Foundation of China[52005482,51975562,and 82072065]the National Key R&D project from Minister of Science and Technology,China[2016YFA0202703]the National Youth Talent Support Program.
文摘Ionogels is a kind of hybrid materials composed of ionic liquids(ILs)and solid polymer network matrix,has been extensively investigated in the most recent decade.Due to the excellent mechanical properties and ionic conductivity,their promising applications in flexible stress and strain sensors have been proposed and explosively developed.In this review,we briefly summarize research progresses on ionogel based flexible stress and strain sensors(IFSSs)from five aspects,including material synthesis,device fabrication,working principles,characteristics and performances,and potential applications.Some outlooks and perspectives are also proposed at the end of review.The review is expected to provide reference and new insights into the research of IFSS.
