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通过简单的自由基聚合作用,首次采用单体甲基丙烯酸二乙氨基乙酯和乙烯基磺酸钠合成了一种新型聚合物.采用IR,1H NMR,动态光散射、表面技术等技术对高聚物进行了表征.该聚合物粒子具有合适的尺寸和很好的微乳化稳定性.按油水比为1∶2,制备稳定的PD-co-SVS水溶液和石蜡油的微乳液,然后通入CO2气泡能快速破乳.在60℃通入,已破乳的PD-co-SVS石蜡油微乳液又很容易被乳化.通过通入CO2气泡和N2,PD-co-SVS石蜡油微乳液的乳化和破乳过程可逆又可重复.这种微乳液可在绿色工业材料的商业使用过程中将会有非常好的应用. 相似文献
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Coupling plane wave into a single-mode fiber(SMF) with high and steady coupling efficiency is crucial for fiberbased free-space laser systems, where random angular jitters are the main influencing factors of fiber coupling. In this paper, we verified a new adaptive-optic device named adaptive fiber coupler(AFC) which could compensate angular jitters and improve the SMF coupling efficiency in some degree. Experiments of SMF coupling under the angular jitter situation using AFC have been achieved. Stochastic parallel gradient descent(SPGD) algorithm is employed as the control strategy, of which the iteration rate is 625 Hz. In closed loop, the coupling efficiency keeps above 65% when angular errors are below 80 μrad. The compensation bandwidth is 35 Hz at sine-jitter of 15 μrad amplitude with average coupling efficiency of above 60%. Also, experiments with simulated turbulence have been studied. The average coupling efficiency increases from 31.97% in open loop to 61.33% in closed loop, and mean square error(MSE) of coupling efficiency drops from 7.43% to 1.75%. 相似文献
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用电感耦合等离子体质谱(ICP -MS)测量了深圳市市场上销售的花甲、生蚝、鲍鱼等16种海产品,分析了铅含量以及同位素比,其中响螺、青口贝、生蚝的铅质量分数最高,分别为(1.52±0.21),(1.66±0.23),(1.16±0.15)μg/g 干质量,超标,其它小于1.00μg/g 干质量,同位素比207 Pb/206 Pb 为0.76~0.89之间。将花甲,鲍鱼,生蚝,喂食昆明小白鼠(每组5只,质量35~38 g),喂食前后(24 h)眼球取血0.030 mL 左右对比分析海鲜中铅进入血液的量,结果表明,生蚝喂食后铅有明显的上升,其中孕鼠生物有效性显著大于对照鼠。通过用水合醋酸铅加入鼠粮中喂食哺育期间母鼠,而被哺乳的新生小鼠血铅含量和母鼠喂食铅成正比,最后一组小鼠血液铅达到(1.95±0.35)μg/g,该组一直喂养2个月(8周)后小鼠个体体质量(15±4 g)与对照(26±5 g)相比显著小。实验表明高含量铅的海产品对孕妇以及哺乳期间母亲和婴儿更为危险。 相似文献
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理论分析了激光瞄准系统中视轴误差与目标照明回光的关系. 介绍了同时具备激光束发射与瞄准偏差校正功能的自适应光学器件––自适应光纤准直器的原理. 搭建了光束经200 m水平大气传输的激光瞄准实验平台. 基于二维目标和三维目标的照明回光, 利用随机并行梯度下降算法分别实现了不同初始视轴误差下的瞄准闭环校正. 实验结果表明, 闭环后二维目标和三维目标的视轴校正残差评价参数分别小于6%和10.8%, 校正精度均在理论范围内. 最后, 分析了算法参数对动目标瞄准的影响. 相似文献
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Experimental demonstration of single-mode fiber coupling using adaptive fiber couplerExperimental demonstration of single-mode fiber coupling using adaptive fiber couplerExperimental demonstration of single-mode fiber coupling using adaptive fiber couplerExperimental demonstration of single-mode fiber coupling using adaptive fiber coupler 下载免费PDF全文
Coupling plane wave into a single-mode fiber (SMF) with high and steady coupling efficiency is crucial for fiber- based free-space laser systems, where random angular jitters are the main influencing factors of fiber coupling. In this paper, we verified a new adaptive-optic device named adaptive fiber coupler (AFC) which could compensate angular jitters and improve the SMF coupling efficiency in some degree. Experiments of SMF coupling under the angular jitter situation using AFC have been achieved. Stochastic parallel gradient descent (SPGD) algorithm is employed as the control strategy, of which the iteration rate is 625 Hz. In closed loop, the coupling efficiency keeps above 65% when angular errors are below 80/3tad. The compensation bandwidth is 35 Hz at sine-jitter of 15 ~rad amplitude with average coupling efficiency of above 60%. Also, experiments with simulated turbulence have been studied. The average coupling efficiency increases from 31.97% in open loop to 61.33% in closed loop, and mean square error (MSE) of coupling efficiency drops from 7.43% to 1.75%. 相似文献
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电流变悬浮液内部结构对外电场的快速响应发生在指定的控制空间中,在这一特指的时间和空间尺度上电流变悬浮液的物理行为特征主要为剪切速率低和流动阻尼大,即Mach和Reynolds数一般不大,可以视为微尺度流动来加以研究。针对这一流动特征,基于介观动理论的格子Boltzmann方法,建立了电流变悬浮液两相流动的离散颗粒运动模型,通过该模型进行了动力学模拟,结果表明,该模型解决了分子动力学模型难以描述的因颗粒运动造成局部流场流变特性改变的难题,以及该流场双向耦合过程中对颗粒运动的影响。 相似文献