An accurate detection of the effective values of electric voltage and current from high frequency power generators is a precondition for the development of smart electrotomes. In this light, an energy detection system...An accurate detection of the effective values of electric voltage and current from high frequency power generators is a precondition for the development of smart electrotomes. In this light, an energy detection system based on personal computer (PC) is developed hereby. It senses voltage and current in isolation from generators with transformers, and then the measured values are amplified, filtered, transformed into single-ended signals and converted to RMS. The detected signals are transformed into digital signals through Data Acquisition Card (DAQ) and the data are processed with quadratic fit in Labview. Finally, the controller completes constant power output. The experiment results indicate that the energy detection system can measure the output parameters precisely and the controller can achieve constant power control.展开更多
This paper presents intensive investigation of dynamics of high frequency nonlinear modulated excitations in a damped bimodal lattice. The effects of the dissipation are considered through a linear dissipation coeffic...This paper presents intensive investigation of dynamics of high frequency nonlinear modulated excitations in a damped bimodal lattice. The effects of the dissipation are considered through a linear dissipation coefficient whose evolution in terms of the carrier wave frequency is checked. There appears that the dissipation coefficient increases with the carrier wave frequency. In the linear limit and for high frequency waves, study of the asymptotic behavior of plane waves reveals the existence of two additional regions in the dispersion curve where the modulational phenomenon is observed compared to the lossless line. Based on the multiple scales method exploited in the continuum approximation using an appropriate decoupling ansatz for the voltage of the two different cells, it appears that the motion of modulated waves is described by a dissipative complex Ginzburg–Landau equation instead of a Korteweg–de Vries equation. We also show that this amplitude wave equation admits envelope and hole solitons in the high frequency mode. From basic sources, we design a programmable electronic generator of complex signals with desired characteristics, which delivers signals exploited as input waves for all our numerical simulations. These simulations are performed in the LTspice software that uses realistic components and give the results that corroborate perfectly our analytical predictions.展开更多
目的比较微创钨针和高频电刀在开放性甲状腺手术中的临床应用效果。方法选取陆军军医大学大坪医院乳腺甲状腺外科2017年1月至2017年12月接受开放性甲状腺手术的95例为研究对象,根据方法不同将其分为微创钨针组(n=50)和高频电刀组(n=45)...目的比较微创钨针和高频电刀在开放性甲状腺手术中的临床应用效果。方法选取陆军军医大学大坪医院乳腺甲状腺外科2017年1月至2017年12月接受开放性甲状腺手术的95例为研究对象,根据方法不同将其分为微创钨针组(n=50)和高频电刀组(n=45),比较两组的手术时间、术中出血量、术后引流量、术后并发症发生率和复发转移率。结果微创钨针组和高频电刀组在手术时间[(79.3±14.7 vs 73.7±13.9)min,t=1.914,P=0.059]、术中出血量[(31.8±9.7 vs 30.3±10.6)ml,t=0.702,P=0.484]、术后引流量[(67.3±13.0 vs 71.3±10.8)ml,t=-1.650,P=0.102]比较差异无统计学意义(P>0.05)。微创钨针组暂时性喉返神经损伤(2%vs 17.8%,χ^2=5.518,P=0.023)和暂时性甲状旁腺功能低下(18%vs 44%,χ^2=7.810,P=0.005)发生率低于高频电刀组,差异有统计学意义(P<0.05)。两组均无永久性喉返神经损伤和甲状旁腺功能低下,随访期内无复发转移。结论微创钨针在开放性甲状腺手术中对喉返神经和甲状旁腺功能保护效果优于高频电刀,值得临床推广应用。展开更多
文摘An accurate detection of the effective values of electric voltage and current from high frequency power generators is a precondition for the development of smart electrotomes. In this light, an energy detection system based on personal computer (PC) is developed hereby. It senses voltage and current in isolation from generators with transformers, and then the measured values are amplified, filtered, transformed into single-ended signals and converted to RMS. The detected signals are transformed into digital signals through Data Acquisition Card (DAQ) and the data are processed with quadratic fit in Labview. Finally, the controller completes constant power output. The experiment results indicate that the energy detection system can measure the output parameters precisely and the controller can achieve constant power control.
文摘This paper presents intensive investigation of dynamics of high frequency nonlinear modulated excitations in a damped bimodal lattice. The effects of the dissipation are considered through a linear dissipation coefficient whose evolution in terms of the carrier wave frequency is checked. There appears that the dissipation coefficient increases with the carrier wave frequency. In the linear limit and for high frequency waves, study of the asymptotic behavior of plane waves reveals the existence of two additional regions in the dispersion curve where the modulational phenomenon is observed compared to the lossless line. Based on the multiple scales method exploited in the continuum approximation using an appropriate decoupling ansatz for the voltage of the two different cells, it appears that the motion of modulated waves is described by a dissipative complex Ginzburg–Landau equation instead of a Korteweg–de Vries equation. We also show that this amplitude wave equation admits envelope and hole solitons in the high frequency mode. From basic sources, we design a programmable electronic generator of complex signals with desired characteristics, which delivers signals exploited as input waves for all our numerical simulations. These simulations are performed in the LTspice software that uses realistic components and give the results that corroborate perfectly our analytical predictions.
文摘目的比较微创钨针和高频电刀在开放性甲状腺手术中的临床应用效果。方法选取陆军军医大学大坪医院乳腺甲状腺外科2017年1月至2017年12月接受开放性甲状腺手术的95例为研究对象,根据方法不同将其分为微创钨针组(n=50)和高频电刀组(n=45),比较两组的手术时间、术中出血量、术后引流量、术后并发症发生率和复发转移率。结果微创钨针组和高频电刀组在手术时间[(79.3±14.7 vs 73.7±13.9)min,t=1.914,P=0.059]、术中出血量[(31.8±9.7 vs 30.3±10.6)ml,t=0.702,P=0.484]、术后引流量[(67.3±13.0 vs 71.3±10.8)ml,t=-1.650,P=0.102]比较差异无统计学意义(P>0.05)。微创钨针组暂时性喉返神经损伤(2%vs 17.8%,χ^2=5.518,P=0.023)和暂时性甲状旁腺功能低下(18%vs 44%,χ^2=7.810,P=0.005)发生率低于高频电刀组,差异有统计学意义(P<0.05)。两组均无永久性喉返神经损伤和甲状旁腺功能低下,随访期内无复发转移。结论微创钨针在开放性甲状腺手术中对喉返神经和甲状旁腺功能保护效果优于高频电刀,值得临床推广应用。
