目的利用360°全方向72个声源测试设备,初步研究耳科正常人水平声源定位特点。方法选取耳科正常人14例,其中男3例,女11例,平均年龄(31.4±7.2)岁,使用360°全方向均匀分布的72个扬声器进行声源方位辨别测试,统计正常人整体...目的利用360°全方向72个声源测试设备,初步研究耳科正常人水平声源定位特点。方法选取耳科正常人14例,其中男3例,女11例,平均年龄(31.4±7.2)岁,使用360°全方向均匀分布的72个扬声器进行声源方位辨别测试,统计正常人整体声源定位能力,计算均方根(root mean square,RMS)值。结果听力正常人声源定位图像大致呈现出两个“十字交叉”的组合图形,镜像处理后呈现为一条斜率近似为1的直线,计算RMS为(20.4±3.5),相较未经镜像处理前(52.7±16.2)有大幅度下降。本组受试者前场、后场、左场、右场4个区域的定位正确的次数比例均值分别为60.52%、38.69%、31.55%和37.70%,前场定位正确的次数明显高于其余3个区域,且差异具有统计学意义(P<0.05),后场、左场、右场定位正确的次数均值无统计学差异(P>0.05)。结论正常人的水平声源方位辨别存在前后镜像现象,水平方向上前场(-45°~45°)声源定位能力最佳,左右场和后场的声源定位能力无显著差别。展开更多
A new method is proposed to determine the binding energy(B)of near proton-drip line isotopes from isotopic cross section distribution.To determine B of Z=22-28 isotopes(with T_z=-2 and-5/2),the lack of cross sections ...A new method is proposed to determine the binding energy(B)of near proton-drip line isotopes from isotopic cross section distribution.To determine B of Z=22-28 isotopes(with T_z=-2 and-5/2),the lack of cross sections for proton-rich isotopes in the 345A MeV^(78)Kr+~9Be is overcome by predicting the proton-rich isotopes from a newly discovered scaling phenomenon found in the proton-rich isotopes measured in the 140A MeV^(40,48)Ca(^(58,64)Ni)+~9Be reactions.The cross sections for proton-rich isotopes are verified to exponentially depend on the average binding energy per nucleon,based on which B of the Z=22-28 isotopes with T_z=-2 and-5/2 are determined from cross sections.The determined B of the isotopes are justified from obeying the scaling phenomenon of the difference between the mass of mirror nuclei.The cross sections for the Z=22-28 isotopes with T_z=-1 and-3/2,which in potential can be experimentally studied in mass storage ring,are also predicted.展开更多
文摘目的利用360°全方向72个声源测试设备,初步研究耳科正常人水平声源定位特点。方法选取耳科正常人14例,其中男3例,女11例,平均年龄(31.4±7.2)岁,使用360°全方向均匀分布的72个扬声器进行声源方位辨别测试,统计正常人整体声源定位能力,计算均方根(root mean square,RMS)值。结果听力正常人声源定位图像大致呈现出两个“十字交叉”的组合图形,镜像处理后呈现为一条斜率近似为1的直线,计算RMS为(20.4±3.5),相较未经镜像处理前(52.7±16.2)有大幅度下降。本组受试者前场、后场、左场、右场4个区域的定位正确的次数比例均值分别为60.52%、38.69%、31.55%和37.70%,前场定位正确的次数明显高于其余3个区域,且差异具有统计学意义(P<0.05),后场、左场、右场定位正确的次数均值无统计学差异(P>0.05)。结论正常人的水平声源方位辨别存在前后镜像现象,水平方向上前场(-45°~45°)声源定位能力最佳,左右场和后场的声源定位能力无显著差别。
基金supported by the National Natural Science Foundation of China(Grant Nos.11421505,and U1732135)the Major State Basic Research Development Program in China(Grant No.2014CB845401)+1 种基金the Natural Science Foundation of Henan Province(Grant No.162300410179)the Henan Normal University for the Excellent Youth(Grant No.154100510007)
文摘A new method is proposed to determine the binding energy(B)of near proton-drip line isotopes from isotopic cross section distribution.To determine B of Z=22-28 isotopes(with T_z=-2 and-5/2),the lack of cross sections for proton-rich isotopes in the 345A MeV^(78)Kr+~9Be is overcome by predicting the proton-rich isotopes from a newly discovered scaling phenomenon found in the proton-rich isotopes measured in the 140A MeV^(40,48)Ca(^(58,64)Ni)+~9Be reactions.The cross sections for proton-rich isotopes are verified to exponentially depend on the average binding energy per nucleon,based on which B of the Z=22-28 isotopes with T_z=-2 and-5/2 are determined from cross sections.The determined B of the isotopes are justified from obeying the scaling phenomenon of the difference between the mass of mirror nuclei.The cross sections for the Z=22-28 isotopes with T_z=-1 and-3/2,which in potential can be experimentally studied in mass storage ring,are also predicted.
