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We propose a lumped element Josephson parametric amplifier with vacuum-gap-based capacitor.The capacitor is made of quasi-floating aluminum pad and on-chip ground.We take a fabrication process compatible with air-bridge technology,which makes our design adaptable for future on-chip integrated quantum computing system.Further engineering the input impedance,we obtain a gain above 20 dB over 162-MHz bandwidth,along with a quasi quantum-limit noise performance.This work should facilitate the development of quantum information processing and integrated superconducting circuit design. 相似文献
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The microwave photonic filters (MPFs) based on serially coupled silicon microring resonators (MRRs) are theoretically analyzed for the application of 60-GHz millimeter wave wireless personal area networks. This is achieved by calculating the improvement of bit error ratio (BER). According to the simulation results, the requirement of signal-to-noise ratio (SNR) of the received data can be reduced by 14 dB for the same BER with and without MPFs. The performance of the MPF with five serially coupled microring structures is better than that of the MPF with a single microring, owing to the improvement of the shape factor. 相似文献
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Compact temperature-insensitive modulator based on a silicon microring assistant Mach-Zehnder interferometer 下载免费PDF全文
<正>On the silicon-on-insulator platform,an ultra compact temperature-insensitive modulator based on a cascaded microring assistant Mach-Zehnder interferometer is proposed and demonstrated with numerical simulation.According to the calculated results,the tolerated variation of ambient temperature can be as high as 134℃while the footprint of such a silicon modulator is only 340μm~2. 相似文献
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Ultra-compact variable optical attenuator based on slow light photonic crystal waveguide 总被引:1,自引:0,他引:1
An ultra-compact variable optical attenuator based on slow light photonic crystal waveguide with thermooptic effect is demonstrated. Along with power consumption of as low as 30.7 mW, a variable attenuation range of 10 dB is experimentally achieved by shifting the transmission spectrum at about 4.6 nm. The length of the proposed device is only 20 μm. 相似文献
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在材料的电磁冶金过程及磁约束核聚变装置中, 金属液滴在磁场和壁面温度影响下的撞击过程表现出复杂的动力学特性. 本文对水平磁场作用下液态镓(Ga)液滴撞击等温和过冷壁面的铺展和回弹特性进行了实验研究. 采用高速相机拍摄液滴撞击过程中轮廓的变化, 通过图像处理获得不同磁场强度、不同撞击速度和不同底板温度下的最大铺展因子、回弹过程中的最大高度以及产生的二次液滴的半径和速度. 碰撞速度由0.45 ~ 1.8 m/s, 磁场强度从0 ~ 1.6 T, 底板温度为30 °C, ?20 °C和?10 °C. 基于实验结果分析了磁场和壁面温度对液滴铺展和回弹的影响规律. 实验结果表明, 液滴撞击等温壁面和过冷壁面的最大铺展因子随We的变化均与理论预测关系式一致. 液滴撞击等温壁面的情况下, 不同的We下, 出现不同的回弹现象. 磁场抑制了平行于磁场方向的液滴铺展和回弹过程中二次液滴的产生, 而对回弹过程中的液滴在平行磁场方向上有拉伸作用. 液滴撞击过冷壁面时, 在一定的We值范围内, 同样会出现二次液滴分离现象, 此时产生的二次液滴的速度较小. 磁场的增强和We的增大都会导致液滴在高度方向的振荡减弱, 加速凝固过程. 相似文献
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目的 分析射频消融(RFA)联合131I 肿瘤细胞核人鼠嵌合单克隆抗体131I-chTNT 治疗中晚期肝癌的安全性和疗
效。方法 回顾性分析34 例原发性肝癌患者的临床资料,分为射频消融组22 例,射频消融+131I-chTNT注射组(联合组)12 例,随访时间5~48 个月,评价其生存期和安全指标,包括肝损伤、骨髓毒性及甲状腺损伤等。结果 联合组术后7d 复查血红细胞、血小板未见明显下降,血白细胞指数略升高,具有统计学意义。术后7dALT、AST明显升高,TBIL 轻微升高。与术前相比,ALT、AST 的差异有统计学意义,TBIL 的差异无统计学意义。治疗后1 个月查甲状腺功能,T3、T4、TSH、FT3、FT4与术前比较无明显变化。联合组治疗术后1个月复查增强CT 或增强MRI,其中CR2 例,PR8 例,SD1 例,PD1 例。联合组中位总生存期较单纯射频治疗组有延长的趋势(P=0.052)。结论 对于中晚期肝癌,射频消融联合131I-chTNT瘤内注射治疗中晚期肝癌是安全有效,未对肝功能、骨髓、甲状腺功
能等产生不良影响。但尚需大样本研究其不良反应。 相似文献
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