宫腔镜电切术治疗子宫内良性占位病变142例临床分析

目的 :探讨宫腔镜电切术治疗子宫内良性病变的疗效及其安全性。方法 :应用连续灌流式宫腔镜 ,对 1 4 2例子宫良性占位病变进行宫腔镜电切手术治疗 ,其中子宫粘膜下肌瘤 2 4例 ,内凸型子宫壁间肌瘤 2 2例 ,子宫内膜息肉 8例 ,子宫腺肌瘤 2例 ,宫颈肌瘤 2 5例 ,宫颈息肉 39例 ,宫颈宫腔复合占位病变 2 2例。随诊 1～ 1 2个月。结果 :所有患者均一次手术成功 ,无明显手术并发症 ,切除瘤体直径 0 .5～ 8.0cm。宫腔电切术的手术时间 1 5～ 70min ,平均 48min ,术中估计出血量约 1 0～ 1 30ml。宫颈电切术的手术时间 3～ 60min ,平均 2 4min ,术中估计出血量约 5～ 50ml。全部患者的临床症状均得到显著改善 ,一次治疗总有效率达 1 0 0 %。结论 :治疗子宫内良性占位病变首选宫腔镜电切术 ,它具有安全、有效、创伤小、并发症少、恢复快等优点。远期疗效尚待观

Transmission shielding technology for bistatic sonar

基线附近区域为双基地声呐的探测盲区,当目标位于基线区域时,目标回波与强直达波干扰同时同向到达,基于空域滤波等的传统直达波抑制方法失效。为实现双基地声呐对盲区内目标的探测,提出了一种适用于多发射阵元系统的发射声屏蔽技术。发射声屏蔽技术利用目标回波与直达波相异的多途信道结构特性,自动屏蔽在接收站位置处的直达波而不影响目标回波,且不需接收站进行任何后续处理。在已知回波信道信息时,发射声屏蔽技术可进一步实现对回波信号的聚焦,提高信干比。仿真结果表明,在不同信道条件下发射声屏蔽均能有效抑制直达波干扰。利用发射声屏蔽技术,双基地声呐能够实现对基线区内目标的检测。The area near the baseline is a dead zone for bistatic sonar.The echo and the strong direct wave will arrive in the same place simultaneously when the target is in the baseline area and the direct wave suppression method based on a spatial filter will fail.To detect targets in the dead zone,a transmission shielding method for a multi-element transmit system is proposed.The transmission shielding automatically suppresses the direct wave at the receiving station utilizing structural differences in multiple channels between the echo and the direct wave.The transmission shielding further focuses on the echo,so as to improve the Signal-Noise Ratio,using known echo channel information.The simulation results show the transmission shielding method can suppress direct wave interference for different multipath channels.Bistatic sonar can detect targets in the baseline area utilizing the transmission shielding method.国家自然科学基金资助项目(51179034); 海洋工程国家重点实验室(上海交通大学)资助项目(1211

Implementation of Low-Frequency Periodic Vibration Sensor Based on Frequency-Swept Fiber Laser

针对低频周期振动光纤传感的应用,通过光纤光栅的周期调谐,构建了环形腔结构的低频周期扫频光纤激光器。以光纤光栅珐布里-珀罗腔为梳状滤波器,利用光学倍频法设计了光源扫频周期的测量系统。实验产生了7.2Hz的周期扫频激光输出,通过测量系统得到了14.39Hz的倍频电信号。实验结果表明该系统可有效地模拟低频光源周期扫频,并进行扫频频率的准确测量。To simulate the periodic and weak vibration in the fiber sensor application,a loop-cavity fiber laser of the periodic frequency sweeping is constructed by tuning the fiber Bragg grating(FBG).To measure the sweeping frequency,the optical frequency multiplication is applied with the help of fiber Bragg grating Fabry-Perot cavity.This fiber laser has experimentally radiated a 7.2 Hz frequency-swept laser and 14.39 Hz electric signal is obtained by the frequency multiplication method.The experimental results show that this system can efficiently simulate the periodic frequency-swept light wave and exactly measure the sweeping frequency.国家自然基金(61077031)资助课

轴承游隙对变速器传动效率的影响研究

针对深沟球轴承的摩擦功率损失会直接影响变速器的传动效率的问题,对深沟球轴承的拟静力学条件下的摩擦力矩组成进行了分析,提出通过改变轴承游隙的大小来降低摩擦功率损失,并设计了台架实验来探究深沟球轴承不同的径向游隙对变速器传动效率的影响;最后,通过整车滑行阻力与油耗实验进行了验证。结果表明,适当的增大游隙可以减小深沟球轴承摩擦功率损失、提升变速器的传动效率、增加整车滑行距离和降低整车油耗。此项研究为变速器轴承游隙的选择提供了参考

Implementation of low-frequency periodic vibration sensor based on frequency-swept fiber laser

To simulate the periodic and weak vibration in the fiber sensor application, a loop-cavity fiber laser of the periodic frequency sweeping is constructed by tuning the fiber Bragg grating (FBG). To measure the sweeping frequency, the optical frequency multiplication is applied with the help of fiber Bragg grating Fabry-Perot cavity. This fiber laser has experimentally radiated a 7.2 Hz frequency-swept laser and 14.39 Hz electric signal is obtained by the frequency multiplication method. The experimental results show that this system can efficiently simulate the periodic frequency-swept light wave and exactly measure the sweeping frequency