目的分析1-36月婴幼儿的宽频声能吸收率（wideband acoustic energy absorbance,WBA）测试结果,为其临床应用提供参考。方法选取1-36月、声导抗测试结果正常、畸变产物耳声发射,测试正常的婴幼儿共172名（337耳）。根据月龄分组：1-2月...目的分析1-36月婴幼儿的宽频声能吸收率（wideband acoustic energy absorbance,WBA）测试结果,为其临床应用提供参考。方法选取1-36月、声导抗测试结果正常、畸变产物耳声发射,测试正常的婴幼儿共172名（337耳）。根据月龄分组：1-2月组,共86耳;3-6月组,共61耳;7-12月,共97耳;13月-36月组,共93耳。对各组婴幼儿进行宽频声能吸收率测试,比较各个月龄段的声能吸收率曲线分布特点,分析吸收率随年龄增长的变化情况。结果 1、声能吸收率随月龄变化,频率-吸收率曲线逐渐由＂~＂转变成＂∧＂形。2、7-12月和13-36月组中有1/2的频率的声能吸收率值差别无统计学意义。3、四组声能吸收率各个频率的标准差SD（standard deviation）的均值分别为0.2066、0.1731、0.1393、0.1583。结论1、随月龄增加,频率-吸收率曲线逐渐由＂~＂转变成＂∧＂形,中高频的声能吸收率效能逐渐高于低频和高频。2、7月以后,吸收率曲线形态逐渐趋于稳定,组内变化差异减小。3、随月龄的变化声能吸收率曲线范围也逐渐变化,当在容许的变化范围内波动时,仍可视为正常中耳。且月龄越小,声能吸收率值波动越大,表明中耳所处的发育状态越不稳定。展开更多
For an energy transfer network, the irreversible depletion of excited electron energy occurs through either an efficient flow into an outer energy sink or an inefficient decay. With a small decay rate, the energy tran...For an energy transfer network, the irreversible depletion of excited electron energy occurs through either an efficient flow into an outer energy sink or an inefficient decay. With a small decay rate, the energy transfer efficiency is quantitatively reflected by the average life time of excitation energy before being trapped in the sink where the decay process is omitted. In the weak dissipation regime, the trapping time is analyzed within the exciton population subspace based on the secular Redfield equation. The requirement of the noise-enhanced energy transfer is obtained, where the trapping time follows an exact or approximate 1/F- scaling of the dissipation strength F. On the opposite side, optimal initial system states are conceptually constructed to suppress the 1/F-scaling of the trapping time and maximize the coherent transfer efficiency. Our theory is numerically testified in four models, including a biased two-site system, a symmetric three-site branching system, a homogeneous one- dimensional chain, and an 8-chromophore FMO protein complex.展开更多
基金supported by the National Natural Science Foundation of China(No.21573195)the Ministry of Science and Technology of China(MOST-2014CB921203)
文摘For an energy transfer network, the irreversible depletion of excited electron energy occurs through either an efficient flow into an outer energy sink or an inefficient decay. With a small decay rate, the energy transfer efficiency is quantitatively reflected by the average life time of excitation energy before being trapped in the sink where the decay process is omitted. In the weak dissipation regime, the trapping time is analyzed within the exciton population subspace based on the secular Redfield equation. The requirement of the noise-enhanced energy transfer is obtained, where the trapping time follows an exact or approximate 1/F- scaling of the dissipation strength F. On the opposite side, optimal initial system states are conceptually constructed to suppress the 1/F-scaling of the trapping time and maximize the coherent transfer efficiency. Our theory is numerically testified in four models, including a biased two-site system, a symmetric three-site branching system, a homogeneous one- dimensional chain, and an 8-chromophore FMO protein complex.
