塞辅音和声调知觉问题

本文报告的两个实验以合成的汉语普通话CV音节作刺激,研究了塞辅音与声调之间在知觉上的相互作用问题。主要结果是:(1)塞辅音的发音方式影响声调的知觉,不送气音使听者在辨别声调时倾向于基频曲线起点高的声调反应; (2)音节的声调也影响对塞音发音方式的判断,在一、四声音节里,听者倾向于将塞辅音听成不送气音,在二、三声音节里,听成送气音。</p

中国海洋生物研究70年

随着中国"海洋强国"战略的提出,加快建设海洋类学科的发展成为历史必然,海洋生物是海洋不可分割的一部分,海洋环境和生物相互依存,相互作用,海洋生物研究重要性日益凸显。为纪念中国科学家在海洋生物领域的突出贡献,本文回顾了建国以来中国海洋生物相关的重要研究进展,梳理了中国科学家在海洋生物领域的突出贡献,系统总结并讨论了未来研究方向,抛砖引玉,希望籍此助推中国海洋生物研究的新高潮。国家自然科学基金项目(41876134,41876171)中国大洋矿产资源研究开发协会专项项目(DY135-E2-5-03)教育部长江学者特聘教授项目(T2014253

塞辅音和声调知觉问题

本文报告的两个实验以合成的汉语普通话CV音节作刺激,研究了塞辅音与声调之间在知觉上的相互作用问题。主要结果是:(1)塞辅音的发音方式影响声调的知觉,不送气音使听者在辨别声调时倾向于基频曲线起点高的声调反应; (2)音节的声调也影响对塞音发音方式的判断,在一、四声音节里,听者倾向于将塞辅音听成不送气音,在二、三声音节里,听成送气音。</p

人的听觉调谐曲线

听觉系统的频率选择性可以用调谐曲线及其Q值表征。本研究用同时掩蔽法测定了10名正常听者和5名听力衰退者的心理物理调谐曲线和生理调谐曲线。为便于两种曲线的比较,实验用了相同的声刺激,即频率为50DHz和4000Hz的感觉级相同的短音。测定生理调谐曲线所用的电生理指标为脑干反应的P_6—SN_(10)复合波的幅值。实验结果表明:(1)两种调谐曲线的锐度Q没有显著的差异,(2)听力衰退者4000Hz的两种调谐曲线的锐度Q都显著地小于正常听力者相应曲线的锐度Q。本文说明用适当的声刺激和电生理指标,生理调谐曲线能够和心理物理调谐曲线近似等值地、同样灵敏地、具有频率特殊性地反映听系统的频率选择性及其变化

人的听觉调谐曲线

听觉系统的频率选择性可以用调谐曲线及其Q值表征。本研究用同时掩蔽法测定了10名正常听者和5名听力衰退者的心理物理调谐曲线和生理调谐曲线。为便于两种曲线的比较,实验用了相同的声刺激,即频率为50DHz和4000Hz的感觉级相同的短音。测定生理调谐曲线所用的电生理指标为脑干反应的P_6&mdash;SN_(10)复合波的幅值。实验结果表明:(1)两种调谐曲线的锐度Q没有显著的差异,(2)听力衰退者4000Hz的两种调谐曲线的锐度Q都显著地小于正常听力者相应曲线的锐度Q。本文说明用适当的声刺激和电生理指标,生理调谐曲线能够和心理物理调谐曲线近似等值地、同样灵敏地、具有频率特殊性地反映听系统的频率选择性及其变化。</p

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies

Prediction of Energy Resolution in the JUNO Experiment

International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors