检索结果-南通市图书馆

Topography of acoustic response characteristics in the auditory cortex of the Kunming mouse

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2000年第5期45卷 443-448页

作者： junxian shen Zhimin Xu Yudong Yao Chinese Acad Sci Inst Biophys Beijing 100101 Peoples R China

Topography of acoustic response characteristics in the auditory cortex (AC) of the Kunming (KM) mouse has been examined by using microelectrode recording techniques. Based on best-frequency (BF) maps, both the primary auditory field (Al) and the anterior auditory field (AAF) are tonotopically organized with a counter running frequency gradient. within an isofrequency stripe, the width of the frequency-threshold curves of single neurons increases, and minimum threshold (MT) decreases towards more ventral locations. BFs in Al and AAF range from 4 to 38 kHz. Auditory neurons with BFs above 40 kHz are located at the rostrodorsal part of the AC. The findings suggest that the KM mouse is a good model suitable for auditory research.

关键词： mouse auditory cortex topography of acoustic response characteristics frequency-threshold curve.

FREQUENCY SELECTIVITY OF PRIMARY AUDITORY NEURONS IN THE BUSHCRICKET GAMPSOCIEIS GRATIOSA

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 1989年第1期8卷 80-85页

作者： shen junxian(Institute of Biophysics, Academia Sinica, Beijing) Acad Sinica China

Sound is one of the information carriers often used in animal communication. Sound produced by animals is useful not only in intraspecific communication,but also in alarm or *** basic problems in hearing should be resolved i. e. frequency selectivity, pattern recognition and sound direction. With intracellular recording and single cell staining techniques, frequency selectivity of primary auditory neurons in the bushcricket has been studied. Each neuron has its characteristic best frequency (BF) and tuning curve in response to sound. The central projections of their axons in the prothoracic ganglion are unikteral, non - transsegmental and of some corresponding relation to their BFs. Neural mechanisms for frequency analysis in species - specific song recognition of the bushcricket are discussed.

关键词： FREQUENCY SELECTIVITY OF PRIMARY AUDITORY NEURONS IN THE BUSHCRICKET GAMPSOCIEIS GRATIOSA kHz

Directional sensitivity of auditory ascending neuron in the bushcricket Gampsocleis gratiosa

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 1990年第2期9卷 170-176页

作者： shen junxian(Institute of Biophysics, Academia Sinica, Beijing))

Quantitative analyses on phonotactic behavior of the bushcricket have demonstrated that the bushcricket possesses good capability to determine direction of sound source. The morphological structure, laterality and directional sensitivity of the auditory ascending neuron in the prothoracic ganglion of the bushcricket have been studied. At its best frequency of 15 kHz, the laterality threshold difference of the neuron is great up to about 16 dB. Its directional sensitivity depends closely on stimulus frequency. The higher the stimulus frequency, the greater the directional threshold differences. Spike count and latency shift of the ascending neuron in response to each stimulus depend on the angle of incidence of sound. Therefore, the two parameters can be used as directional cues of sound source by the ascending neuron.

关键词： Directional sensitivity of auditory ascending neuron in the bushcricket Gampsocleis gratiosa

基于CycleGan的动车零件图像高光消除方法

在线全文

学校读者我要写书评

暂无评论

机械与电子 2024年第7期42卷 10-15页

作者：沈钧贤梅劲松王干陈苏扬南京航空航天大学自动化学院江苏南京211106 南京拓控信息科技股份有限公司江苏南京210004 南京地铁运营有限责任公司江苏南京210000

应用光学无接触方法检测动车零件损伤时,采集图像的照射光易在零件上造成镜面反射,使得采集图像上存在高光,不利于对损伤部位的辨识。提出一种基于循环对抗生成网络(CycleGan)和光照补偿算法结合的方法来修复动车轮部图像的高光部分。... 详细信息

应用光学无接触方法检测动车零件损伤时,采集图像的照射光易在零件上造成镜面反射,使得采集图像上存在高光,不利于对损伤部位的辨识。提出一种基于循环对抗生成网络(CycleGan)和光照补偿算法结合的方法来修复动车轮部图像的高光部分。首先通过生成手段初步修复高光区域,然后改进Retinex光照补偿算法,实现对生成图像的进一步增强,达到高光消除的目的。实验结果表明,所提方法大幅改善了高光区域的像素灰度,使得该部分像素灰度接近图像整体像素灰度,同时强化了暗部细节和图像信息,提高了损伤部分的辨识度。

关键词：高光消除图像处理光照补偿循环对抗生成网络

AN ELECTROPHYSIOLOGICAL STUDY ON HEARING OF THE CICADA CRYPTOTYMPANA ATRATA FABRICIUS (HOMOPTERA: CICADIDAE)

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 1988年第2期7卷 164-170页

作者：沈钧贤 Acad Sinica China

The characteristics in response to sound and directional sensitivity of the auditory primary neurons andinterneurons of the cicada Cryptotympna atrata were studied with neurophysiological *** are tuned to a similar characteristic frequency,which is in correspondence with the dominantfrequency of calling song of the *** are able to code sound intensity within the dynamic range of 4OdB above thresholds with an increment of about two spikes per 10 *** auditory neurons possess gooddirectiond sensitivity with the threshold difference of 10—12 dB at the best frequency between contra-andipsilateral stimulations.

关键词： HOMOPTERA AN ELECTROPHYSIOLOGICAL STUDY ON HEARING OF THE CICADA CRYPTOTYMPANA ATRATA FABRICIUS

New progress on acoustic communication in the concave-eared torrent frog and its revelation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Foundation in China 2007年第1期15卷 49-50页

作者： shen junxian State Key Laboratory of Brain and Cognitive Science Institute of Biophysics Chinese Academy of Sciences Beijing 100101

Animals have special solution to the problem of communication in high levels of background noise. A small group of vertebrates (bats,dolphins and whales,and some rodents) that use ultrasound for *** research first demonstrated that the concave-eared torrent frog is the first non- mammalian vertebrate found to be capable of pro- ducing and detecting ultrasounds for communica- *** study may provide a clue for understand- ing why humans have ear canals and how animals auditory systems have evolved,and inspire in de- veloping bionic tecnology for improving hearing in noise.

关键词： concave-eared torrent frog acoustic communication ultrasonic hearing background noise

AB_(2)-type rare earth-based compounds with C-15 structure:Looking for reversible hydrogen storage materials

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第5期42卷 803-816,I0001页

作者： Hao shen junxian Zhang Valerie Paul-Boncour Ping Li Zhinian Li Yuanfang Wu Lijun Jiang National Engineering Research Center of Nonferrous Metals Materias and Products for New Energy GRINM Group Co.LtdBeijing00088China Univ Paris Est Creteil CNRSICMPEUMR 71822 rue Henri Dunant94320ThiaisFrance Institute for Advanced Materials and Technology University of Science and TechnologyBeijing100083China GRIMAT Engineering Institute Co. Ltd.Beijing101407China

AB_(2)-type(A=rare earth,B=transition metal)intermetallic compounds with C15 structure can easily absorb large amount of hydrogen,showing their potential use as hydrogen storage *** crucial problem hindering their application is hydrogen induced amorphization(HIA),which leads to the irreversible hydrogen sorption *** stability of the AB_2 Laves phase compounds,the structural properties,the hydrogenation properties and the controlling factors of HIA are discussed in this *** with other factors,the atomic radii ratio r_A/r_B is the most important one influencing the ***-element substitution is an efficient way to suppress or limit HIA and may enable AB_2 compounds to be suitable for hydrogen storage.

关键词： Rare earth-based AB_2-type compounds Hydrogenation properties Hydrogen induced amorphization Elemental substitution

SONG PRODUCTION AND HEARING IN THE BUSHCRICKET DERACANTHA ONOS (ORTHOPTERA, TETTIGONIIDAE)

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 1988年第1期7卷 83-89页

作者：沈钧贤关力 Inst of Biophysics China

The basic features of song pattern,stridulatory mechanism and auditory sensitivity in thebushcricket species Deracantha onos were studied with sond analysis and *** bushcricket uses an elytro-elytral mechanism of sound production:a denticulatedvein(file)on the under-surface of the left elytron is rubbed by the inside edge(plectrum)of the rightelytron at the rate of 30—33/*** a few teeth does not influence the rhythm of the motorneurons innervating the *** file-train of pulses is the element of calling song of ***-train of pulses is composed of one elytra-opening pulse and 11 to 13 elytra-closing tooth *** tooth impact of the file at the plectrum elicts a damped oscillation called'tooth pulse'.The rateof tooth pulses is about 450/*** frequency spectrum of the song covers a wide frequency bandmainly between 6 and 30 kHz with a predominant peak at 12 to 14 *** intensity is about 110 dBat 10cm from the *** best sensitivity of heari

关键词： SONG PRODUCTION AND HEARING IN THE BUSHCRICKET DERACANTHA ONOS ORTHOPTERA,TETTIGONIIDAE

A study of song characteristics and hearing in the bushcricket Gampsocleis gratiosa

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Acoustics 1991年第4期10卷 359-366页

作者： shen junxian and TANG Huan(Institute of Biophysics, Academia Sinica, Beijing 100080)

The structure, power spectrum and temporal parameters of the calling song of the bushcricket Gampsocleis gratiosa were studied with acoustic analysis techniques. The bushcricket uses an elytro-elytral mechanism in sound production: the denticulated vein ( file ) on the under-surface of the left elytron is rubbed by the insider edge of the right elytron ( plectrum ). The file-train of pulses is composed of one elytra-opening pulse and 6 - 7 elytra-closing tooth pulses. The power spectrum of the song covers a wide frequency band. The acoustic energy is mainly distributed over the frequency range between 3 and 35 kHz. The predominant peak lies near 7.5 kHz and the next one around 4.0kHz. The song intensity is measured of about 105 dB SPL at a distance of 10 cm from the animal. The temporal parameters of the song are dependent on the ambient temperature. Three-dimensional digital spectrograms of the song show its dynamic changes of the energy peaks. The bushcricket is very sensitive to acoustic stimuli and its thresholds are less than 30 dB SPL in the frequency range from 7 to 18 kHz, which corresponds to dominant energy zone. The auditory neurons of the bushcricket can code the temporal parameters of the calling songs.

关键词： A study of song characteristics and hearing in the bushcricket Gampsocleis gratiosa