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  • Comparative Studies. Non-European Languages/Literatures  (10)
  • 1
    Online Resource
    Online Resource
    T'ien-kung k'ai-wu: Chinese Technology in the Seventeenth Century
    JSTOR ; 1967
    In:  Journal of the American Oriental Society Vol. 87, No. 1 ( 1967-01), p. 80-
    Details
    In: Journal of the American Oriental Society, JSTOR, Vol. 87, No. 1 ( 1967-01), p. 80-
    Type of Medium: Online Resource
    ISSN: 0003-0279
    URL: Article
    DOI: 10.2307/596608
    RVK:
    EL 1000
    RVK:
    EG 1000
    Language: Unknown
    Publisher: JSTOR
    Publication Date: 1967
    detail.hit.zdb_id: 2065887-4
    SSG: 6,24
    SSG: 1
    SSG: 6,23
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  • 2
    Online Resource
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    A numerical study of rough interface reverberation suppression, clutter elimination and target resonance excitation in heterogeneous media with single channel iterative time reversal.
    Acoustical Society of America (ASA) ; 2009
    In:  The Journal of the Acoustical Society of America Vol. 126, No. 4_Supplement ( 2009-10-01), p. 2225-2225
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 126, No. 4_Supplement ( 2009-10-01), p. 2225-2225
    Abstract: The presence of echo returns from the rough interface of two layered medium, and the clutter of volume scattering hinders the detection of target buried in heterogeneous media. The situations are often raised in ultrasonic breast tumor diagnosis and underwater acoustic buried mine detection. This work investigates the application of monostatic single channel iterative time reversal in mitigating the difficulties with a numerical study. Simulations based on pseudospectral finite-difference time-domain method are performed with a sphere buried in the heterogeneous media of lower layer, a transmitter is situated at the upper homogeneous domain, and the interface position is normally distributed. A wideband signal is launched to initiate the process, and the time-reversed echo received at same position is emanated as renewed interrogation pulse for next iteration. Some field snapshots are taken and the echo is recorded in each iteration. The results illustrate as the number of iteration increases, small volume scattering is eliminated, and rough interface reverberation is suppressed relatively. The echoes will converge to a narrowband waveform corresponding to an object’s dominant resonance mode. The detection of target is achieved by exploiting this important acoustic signature. [Work supported by the CAS Innovation Fund.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3248951
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2009
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    Acoustic measurements of the anatomy of fish at 220 kHz
    Acoustical Society of America (ASA) ; 1985
    In:  The Journal of the Acoustical Society of America Vol. 78, No. 5 ( 1985-11-01), p. 1772-1776
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 78, No. 5 ( 1985-11-01), p. 1772-1776
    Abstract: Many measurements of sound backscattered by fish have been made, but most of these are farfield measurements from whole fish. Some of the acoustic properties of a fish can be inferred from the dependence of scattering on aspect and removal of organs such as the swim bladder. However, farfield measurements do not give the detailed structure needed to construct a Huygen’s scatterer acoustic model of a fish. We built a 220-kHz focused sonic scanner. The focal distance was 10 cm and the axis of the fish was placed at 10 cm from the transducer for measurements. We measured the peak amplitudes of backscatter sound along the length of yellow perch (Perca flavescens) (12–14 cm) and hog sucker (Hypenteeium nigricans) (30 cm). Repeatability of results was examined in three different yellow perch and gave a good agreement between the resulting backscattering curves. Preservation (freezing) of the fish resulted in approximately 30% reduction of the overall backscatter but did not affect the shape of the backscattering curve. The measurements showed that the swim bladder gave about 80% of the scattered energy for the yellow perch. The swim bladder gave only about 20% of the scattered energy for the hog sucker. Vertebrae, head, and flesh were distributed scatterers. We observed a gross dependence of the distribution of scatterers on the species of fish. These differences should be observable in measurements of the probability density functions of fish echoes.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.392763
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1985
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    Recovery cycles of inferior collicular neurons in the leaf-nosed bat, Hipposideros armiger
    Acoustical Society of America (ASA) ; 2012
    In:  The Journal of the Acoustical Society of America Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3424-3424
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3424-3424
    Abstract: When stimulated with biologically relevant constant frequency–frequency modulation (CF–FM) sounds, the inferior collicular neurons of the CF–FM bat, Hipposideros armiger, either only discharged impulses to the onset (76%, single-on neurons) of the CF-FM sounds or to the onset of both CF and FM components of CF–FM sounds (24%, double-on neuron). Some neurons were single-on responders at low sound amplitude but become double-on responders at high sound amplitude. Single-on responders had longer latency and recovery cycle than double-on responders. While most neurons did not respond to the second sound when the paired CF-FM sounds overlapped, 3 single-on and 7 double-on neurons did such that they had “cyclic” recovery cycles with inter-pulse intervals. The different response latency and dynamic variation in the recovery cycle of these two types of neurons suggest they may serve as the neural basis underlying a bat's ability to perform echo ranging throughout different phases of hunting.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4708841
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2012
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  • 5
    Online Resource
    Online Resource
    Experimental investigation of bottom target detection by single channel iterative time reversal.
    Acoustical Society of America (ASA) ; 2009
    In:  The Journal of the Acoustical Society of America Vol. 125, No. 4_Supplement ( 2009-04-01), p. 2702-2702
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 125, No. 4_Supplement ( 2009-04-01), p. 2702-2702
    Abstract: Iterative time reversal process will gradually lead echo waves to converge to a dominant narrowband resonant mode of the target and enhance the return level in noisy and reverberant environment. This technique is used in bottom target detection and an experiment has been performed in the Yellow Sea, China. The experiment is in a monostatic configuration, and the target, which is a 53 cm external diameter and 260 cm long stainless steel cylindrical shell with concrete interior, is resting on the seafloor, and the directional transceiver, which is a transmitter and receiver couple, is located right above the target. First, a broadband interrogation pulse is launched, and the echo is measured and a bandpass filter is applied to avoid transceiver response peak, then the signal is time reversed and retransmitted, and repeat above procedures iteratively. The bottom reverberation will gradually be suppressed, and the center frequency of converged signal corresponds to a target resonance frequency, which is different from inhomogeneous bottom response in no target case. The existence of target is determined by this important acoustic signature, and the results illustrate the feasibility of this method. [Work partially supported by the CAS Innovation Fund.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3139551
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2009
    detail.hit.zdb_id: 1461063-2
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  • 6
    Online Resource
    Online Resource
    A generalized network based on multi-scale densely connection and residual attention for sound source localization and detection
    Acoustical Society of America (ASA) ; 2022
    In:  The Journal of the Acoustical Society of America Vol. 151, No. 3 ( 2022-03-01), p. 1754-1768
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 151, No. 3 ( 2022-03-01), p. 1754-1768
    Abstract: Sound source localization and detection (SSLD) is a joint task of identifying the presence of individual sound events and locating the sound sources in space. However, due to the diversity of sound events and the variability of sound source location, SSLD becomes a tough task. In this paper, we propose a SSLD method based on a multi-scale densely connection (MDC) mechanism and a residual attention (RA) mechanism. We design a MDC block to integrate the information from a very local to exponentially enlarged receptive field within the block. We also explored three kinds of RA blocks that can facilitate the conductivity of information flow among different layers by continuously adding feature maps from the previous layers to the next layer. In order to recalibrate the feature maps after convolutional operation, we design a dual-path attention (DPA) unit that is largely embodied in MDC and RA blocks. We firstly verified the effectiveness of the MDC block, RA block, and DPA unit, respectively. We then compared our proposed method with another four methods on the development dataset; finally, with SELDnet and SELD-TCN on another five datasets, experimental results show the generalization of our proposed method.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0009671
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2022
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  • 7
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    Online Resource
    Drug delivery through the opened blood-brain barrier in mice and non-human primates
    Acoustical Society of America (ASA) ; 2014
    In:  The Journal of the Acoustical Society of America Vol. 135, No. 4_Supplement ( 2014-04-01), p. 2210-2210
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 135, No. 4_Supplement ( 2014-04-01), p. 2210-2210
    Abstract: Over five million U.S. men and women suffer from neurodegenerative diseases. Although great progress has been made in recent years toward understanding of these diseases, few effective treatments and no cures are currently available. This is mainly due to the impermeability of the blood-brain barrier (BBB) that allows only 5% of more than 7000 small-molecule drugs available to treat only a tiny fraction of these diseases. Safe and localized opening of the BBB has been proven to present a significant challenge. Focused ultrasound (FUS), in conjunction with microbubbles, remains the sole technique that can induce localized BBB opening noninvasively and regionally. In the past, our group has focused on cavitation monitoring during BBB opening in both mice and non-human primates, assessment of safety and drug efficacy using behavioral testing, delivery of molecules of variant size through the opened BBB, investigation on the role of the microbubble diameter and use of nanodroplets. We will briefly highlight these past findings as well as introduce newer accomplishments such as its role in enhancement of drugs for neuroprotection and neuroregeneration in the treatment of Parkinson's, the use of alternative routes of systemic administration for larger drug dosage, dependence of the BBB opening size on the acoustic pressure, real-time monitoring of the microbubble perfusion of the brain, cavitation prediction of the timeline of BBB opening, and targeted delivery using adeno-associated viruses.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4877217
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2014
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  • 8
    Online Resource
    Online Resource
    Measurement of characteristic impedance and wave number of porous material using pulse-tube and transfer-matrix methods
    Acoustical Society of America (ASA) ; 2009
    In:  The Journal of the Acoustical Society of America Vol. 126, No. 6 ( 2009-12-01), p. 3049-3056
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 126, No. 6 ( 2009-12-01), p. 3049-3056
    Abstract: The time domain implementation of the transfer-matrix method developed by Song and Bolton [J. Acoust. Soc. Am. 107, 1131–1154 (2000)] for measuring the characteristic impedance and wave number of porous materials is described in this paper. The so called Butterworth impulse is generated in a standing wave tube with a flat frequency response over a wide frequency range. With only two microphone measurements, the transfer matrix of porous layers can easily be determined through the calculation of complex amplitudes of incident, reflected, and transmitted pulses. The procedure has been used to measure the acoustical properties of a fiber material, and good agreement was found between measured acoustical pro perties and predicted results by Delany and Bazley [Appl. Acoust. 3, 105–116 (1971)] semiempirical formulas. Although the error associated with the sample-edge constraint still remains, the new method has a better frequency response as a result of the system calibration process, and the optimal inter-microphone distance is no longer required compared to the frequency domain implementation.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3242354
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2009
    detail.hit.zdb_id: 1461063-2
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  • 9
    Online Resource
    Online Resource
    An A-mode ultrasound technique for tracking the advance of coagulation front in laser irradiated tissue
    Acoustical Society of America (ASA) ; 1998
    In:  The Journal of the Acoustical Society of America Vol. 103, No. 5_Supplement ( 1998-05-01), p. 2963-2963
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 103, No. 5_Supplement ( 1998-05-01), p. 2963-2963
    Abstract: This communication presents an A-mode ultrasound technique for automatically determining the advance of coagulation damage front in laser irradiated tissue. The basic assumption underlying our technique is that the waveform of the echo signal scattered from a tissue region undergoing coagulation should be changing more rapidly than tissue regions where no coagulation is taking place. In this technique, we first track rf echo signals scattered from many small tissue regions during heating by computing the cross-correlation coefficient between two consecutively acquired echo signals. We then use the resulting coefficients as a measure of waveform change to determine the position of coagulation front via an automatic procedure. To test our technique, we carried out ten in-vitro experiments in which pig liver samples were irradiated using an Nd:YAG laser with fluence in the range of 32.4–112.0 W/cm2 for 290 s. A 10-MHz broadband single-element spherical focused ultrasound transducer was used to detect the thermal coagulation front. The mean-square difference between ultrasonically and histologically determined coagulation depths was 1.0 mm, whereas the mean coagulation depth was 7.2 mm. This good agreement between ultrasonically and histologically determined results shows the potential of our technique for monitoring coagulative tissue damage during thermal therapy.  
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.421665
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1998
    detail.hit.zdb_id: 1461063-2
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  • 10
    Online Resource
    Online Resource
    How do blind people use semantic and phonological cues for spoken word recognition? An ERP study
    Acoustical Society of America (ASA) ; 2020
    In:  The Journal of the Acoustical Society of America Vol. 148, No. 4_Supplement ( 2020-10-01), p. 2507-2508
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 148, No. 4_Supplement ( 2020-10-01), p. 2507-2508
    Abstract: Spoken word recognition is affected by phonemic and semantic details of speech at pre-lexical and lexical levels. The current study examined how blind people used semantic and phonological cues for spoken word recognition. Thirty blind and twenty-nine age-matched sighted people participated in this study. We manipulated the semantic similarity and phonological similarity between the primes and targets in three experimental conditions: semantic-related with different phonology (S + P-), semantic-unrelated with different phonology (S-P-), and semantic-unrelated with the same phonology (S-P + ). Results showed that blind participants had higher accuracies than sighted individuals in both the S-P- and S-P + conditions. As both groups exhibited larger N400 amplitude in the S-P- versus S + P- conditions, the semantic-unrelated N400 effect was stronger in blind than in sighted participants, suggesting a more sensitive processing of semantic information in blind people. Moreover, sighted participants showed stronger N400 effect in the S-P + than in the S-P- conditions, but blind participants did not, indicating an interference of phonological similarity in spoken word recognition for sighted listeners only. In summary, blind people are more sensitive to semantic cues and less susceptible to phonological similarity interference during spoken word recognition than sighted people.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5146969
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2020
    detail.hit.zdb_id: 1461063-2
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