为标定光交叉芯片驱动电压,控制光交叉芯片实现光路由功能,提出并搭建了基于多通道DAC(Digital to Analog Converter)阵列的控制驱动电路系统。系统主要由控制系统模块、多路驱动电路模块及上位机控制模块构成。控制电路和驱动电路具有...为标定光交叉芯片驱动电压,控制光交叉芯片实现光路由功能,提出并搭建了基于多通道DAC(Digital to Analog Converter)阵列的控制驱动电路系统。系统主要由控制系统模块、多路驱动电路模块及上位机控制模块构成。控制电路和驱动电路具有调校简单、可双极性输出、输出路数多、加电精确度较高的特点,解决了当前驱动电路工作繁琐、加电极性单一、加电路数少、精度差的问题。上位机控制模块除了可控制驱动电路施加控制电压外,还可接收来自数据采集装置采集到的光功率信号作为控制驱动系统的反馈信号。通过分析控制电压与光功率之间的关系,可得到最佳的光交叉芯片控制驱动电压。系统测试实验结果表明,该系统能提供高精确度的双极性驱动电压,有效地对光交叉芯片进行驱动。可在较短的时间内标定出光开关的控制电压,完全可以满足有源光交叉芯片控制中对驱动电压的需求。该系统在光交叉芯片控制方面具有一定的应用价值。展开更多
The space-time behavior for the Cauchy problem of the 3D compressible bipolar Navier-Stokes-Poisson(BNSP)system with unequal viscosities is given.The space-time estimate of the electric field▽φ=▽(-△)^(-1)(n-Zρ)is...The space-time behavior for the Cauchy problem of the 3D compressible bipolar Navier-Stokes-Poisson(BNSP)system with unequal viscosities is given.The space-time estimate of the electric field▽φ=▽(-△)^(-1)(n-Zρ)is the most important in deducing generalized Huygens’principle for the BNSP system and it requires proving that the space-time estimate of n-Zρonly contains the diffusion wave due to the singularity of the operator▽(-△)^(-1).A suitable linear combination of unknowns reformulating the original system into two small subsystems for the special case(with equal viscosities)in Wu and Wang(2017)is crucial for both linear analysis and nonlinear estimates,especially for the space-time estimate of▽φ.However,the benefits from this reformulation will no longer exist in general cases.Here,we study an 8×8 Green’s matrix directly.More importantly,each entry in Green’s matrix contains wave operators in the low-frequency part,which will generally produce Huygens’wave;as a result,one cannot achieve the space-time estimate of n-Zρthat only contains the diffusion wave as before.We overcome this difficulty by taking a more detailed spectral analysis and developing new estimates arising from subtle cancellations in Green’s function.展开更多
目的比较单双极电极系统宫腔镜不同水平膨宫液入量患者术后的血钙浓度,评估不同电极系统宫腔镜手术的安全性。方法回顾性分析南方医科大学南海医院132例宫腔镜手术患者,分为单极系统组(使用5%葡萄糖液膨宫)和双极系统组(使用生理盐水液...目的比较单双极电极系统宫腔镜不同水平膨宫液入量患者术后的血钙浓度,评估不同电极系统宫腔镜手术的安全性。方法回顾性分析南方医科大学南海医院132例宫腔镜手术患者,分为单极系统组(使用5%葡萄糖液膨宫)和双极系统组(使用生理盐水液体膨宫),每组依据手术中使用膨宫液的入量分为三个组,分别为:A组(≤3 000 m L)、B组(3 000~6 000 m L)、C组(≥6 000 m L),利用统计学软件SPSS一般线性模型(GLM)进行统计学分析。结果单极组术后血Ca2+浓度普遍低于双极组,差异有统计学意义(P<0.05);C组术后血Ca2+浓度较A组及B组均降低,差异有统计学意义(P<0.05)。结论单双极系统使用膨宫液入量在6 000 m L以上时,血清Ca2+浓度明显降低;单极系统较双极系统更容易引起血Ca2+浓度降低,双极系统手术安全性更高。展开更多
The bipolar low-voltage DC(LVDC) distribution system has become a prospective solution to better integration of renewables and improvement of system efficiency and reliability. However, it also faces the challenge of ...The bipolar low-voltage DC(LVDC) distribution system has become a prospective solution to better integration of renewables and improvement of system efficiency and reliability. However, it also faces the challenge of power and voltage imbalance between two poles. To solve this problem, an interface converter with bipolar asymmetrical operating capabilities is applied in this paper. The steady-state models of the bipolar LVDC distribution system equipped with this interface converter in the gridconnected mode and off-grid mode are analyzed. A control scheme based on DC offset injection at the secondary side of the interface converter is proposed, enabling the bipolar LVDC distribution system to realize the unbalanced power transfer between two poles in the grid-connected mode and maintain the inherentpole voltage balance in the off-grid mode. Furthermore, this paper also proposes a primary-side DC offset injection control scheme according to the analysis of the magnetic circuit model, which can eliminate the DC bias flux caused by the secondaryside DC offset. Thereby, the potential core magnetic saturation and overcurrent issues can be prevented, ensuring the safety of the interface converter and distribution system. Detailed simulations based on the proposed control scheme are conducted to validate the function of power and voltage balance under the operation conditions of different DC loads.展开更多
文摘为标定光交叉芯片驱动电压,控制光交叉芯片实现光路由功能,提出并搭建了基于多通道DAC(Digital to Analog Converter)阵列的控制驱动电路系统。系统主要由控制系统模块、多路驱动电路模块及上位机控制模块构成。控制电路和驱动电路具有调校简单、可双极性输出、输出路数多、加电精确度较高的特点,解决了当前驱动电路工作繁琐、加电极性单一、加电路数少、精度差的问题。上位机控制模块除了可控制驱动电路施加控制电压外,还可接收来自数据采集装置采集到的光功率信号作为控制驱动系统的反馈信号。通过分析控制电压与光功率之间的关系,可得到最佳的光交叉芯片控制驱动电压。系统测试实验结果表明,该系统能提供高精确度的双极性驱动电压,有效地对光交叉芯片进行驱动。可在较短的时间内标定出光开关的控制电压,完全可以满足有源光交叉芯片控制中对驱动电压的需求。该系统在光交叉芯片控制方面具有一定的应用价值。
基金supported by National Natural Science Foundation of China(Grant No.11971100)supported by National Natural Science Foundation of China(Grant Nos.12271357,12161141004,and 11831011)+1 种基金Natural Science Foundation of Shanghai(Grant No.22ZR1402300)Shanghai Science and Technology Innovation Action Plan(Grant No.21JC1403600)。
文摘The space-time behavior for the Cauchy problem of the 3D compressible bipolar Navier-Stokes-Poisson(BNSP)system with unequal viscosities is given.The space-time estimate of the electric field▽φ=▽(-△)^(-1)(n-Zρ)is the most important in deducing generalized Huygens’principle for the BNSP system and it requires proving that the space-time estimate of n-Zρonly contains the diffusion wave due to the singularity of the operator▽(-△)^(-1).A suitable linear combination of unknowns reformulating the original system into two small subsystems for the special case(with equal viscosities)in Wu and Wang(2017)is crucial for both linear analysis and nonlinear estimates,especially for the space-time estimate of▽φ.However,the benefits from this reformulation will no longer exist in general cases.Here,we study an 8×8 Green’s matrix directly.More importantly,each entry in Green’s matrix contains wave operators in the low-frequency part,which will generally produce Huygens’wave;as a result,one cannot achieve the space-time estimate of n-Zρthat only contains the diffusion wave as before.We overcome this difficulty by taking a more detailed spectral analysis and developing new estimates arising from subtle cancellations in Green’s function.
文摘目的比较单双极电极系统宫腔镜不同水平膨宫液入量患者术后的血钙浓度,评估不同电极系统宫腔镜手术的安全性。方法回顾性分析南方医科大学南海医院132例宫腔镜手术患者,分为单极系统组(使用5%葡萄糖液膨宫)和双极系统组(使用生理盐水液体膨宫),每组依据手术中使用膨宫液的入量分为三个组,分别为:A组(≤3 000 m L)、B组(3 000~6 000 m L)、C组(≥6 000 m L),利用统计学软件SPSS一般线性模型(GLM)进行统计学分析。结果单极组术后血Ca2+浓度普遍低于双极组,差异有统计学意义(P<0.05);C组术后血Ca2+浓度较A组及B组均降低,差异有统计学意义(P<0.05)。结论单双极系统使用膨宫液入量在6 000 m L以上时,血清Ca2+浓度明显降低;单极系统较双极系统更容易引起血Ca2+浓度降低,双极系统手术安全性更高。
基金supported by the National Natural Science Foundation of China (No. 51877136)the Shanghai Committee of Science and Technology (No. 19DZ1205403)the Inner Mongolia Autonomous Region Committee of Science and Technology (No. 2020GG0299)。
文摘The bipolar low-voltage DC(LVDC) distribution system has become a prospective solution to better integration of renewables and improvement of system efficiency and reliability. However, it also faces the challenge of power and voltage imbalance between two poles. To solve this problem, an interface converter with bipolar asymmetrical operating capabilities is applied in this paper. The steady-state models of the bipolar LVDC distribution system equipped with this interface converter in the gridconnected mode and off-grid mode are analyzed. A control scheme based on DC offset injection at the secondary side of the interface converter is proposed, enabling the bipolar LVDC distribution system to realize the unbalanced power transfer between two poles in the grid-connected mode and maintain the inherentpole voltage balance in the off-grid mode. Furthermore, this paper also proposes a primary-side DC offset injection control scheme according to the analysis of the magnetic circuit model, which can eliminate the DC bias flux caused by the secondaryside DC offset. Thereby, the potential core magnetic saturation and overcurrent issues can be prevented, ensuring the safety of the interface converter and distribution system. Detailed simulations based on the proposed control scheme are conducted to validate the function of power and voltage balance under the operation conditions of different DC loads.
