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  • Comparative Studies. Non-European Languages/Literatures  (10)
  • 1
    Online Resource
    Online Resource
    Multiband asymmetric sound absorber enabled by ultrasparse Mie resonators
    Acoustical Society of America (ASA) ; 2021
    In:  The Journal of the Acoustical Society of America Vol. 149, No. 3 ( 2021-03-01), p. 2072-2080
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 149, No. 3 ( 2021-03-01), p. 2072-2080
    Abstract: On the quest towards efficiently eliminating noises, the development of a subwavelength sound absorber with the capability of free ventilation remains challenging. Here, we theoretically propose and experimentally demonstrate an asymmetric metamaterial absorber constructed by tuned Mie resonators (MRs) with unbalanced intrinsic losses. The lossy MR layer is highly dissipative to consume the sound energy while the lossless one acts as an acoustically soft boundary. Thus, the absorber presents quasi-perfect absorption (95% in experiment) for sound waves incident from the port nearer the dissipative MR and large-amount reflection (71% in experiment) from the opposite port. Moreover, the fluid dynamics investigation confirms the superior character of free air circulation owing to the ultrasparsity (volume filling ratio as low as 5%) of the absorber and its robustness to the velocity of airflows. Due to the multiple-order resonant modes of MR, we further demonstrate the flexibility of a methodology to extend asymmetric absorptions into multibands. Coupled mode analysis is employed to reveal the physical mechanism and further indicates that sparsity can be tuned by attentively controlling the reference leakage factor and intrinsic loss.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0003822
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2021
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Head shadow effect and pinna effect by sound intensity.
    Acoustical Society of America (ASA) ; 2009
    In:  The Journal of the Acoustical Society of America Vol. 125, No. 4_Supplement ( 2009-04-01), p. 2527-2527
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 125, No. 4_Supplement ( 2009-04-01), p. 2527-2527
    Abstract: This study is to develop a procedure of measuring the influences of the head shadow effect and pinna effect by stimulus intensities and stimulus frequencies (125 Hz to 8 kHz) based on the stimulus source at azimuth angles (0°–180°). In this study, the head shadow effect would be affected by the stimulus frequencies at 3–8 kHz, and the difference of sound pressure for bilateral ears was 7.46–41.40 dB SPL. The pinna effect would be affected by the stimulus frequencies at 3–8 kHz. The difference of sound pressure for all sound sources was 6.62–35.69 dB SPL. The pinna effect would occur most apparently at 135° of azimuth. Consequently, the sound intensity would not affect the head shadow effect and the pinna effect. On the contrary, the pinna effect, the head shadow effect, the frequency of stimuli and the sound location should be considered for hearing aids selection for hearing-impaired listeners.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4783524
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2009
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  • 3
    Online Resource
    Online Resource
    Hierarchical prosody modeling for Mandarin spontaneous speech
    Acoustical Society of America (ASA) ; 2019
    In:  The Journal of the Acoustical Society of America Vol. 145, No. 4 ( 2019-04-01), p. 2576-2596
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 145, No. 4 ( 2019-04-01), p. 2576-2596
    Abstract: In this paper, a hierarchical prosody model (HPM)-based method for Mandarin spontaneous speech is proposed. First, an HPM is designed for describing relations among acoustic features of utterances, linguistic features of texts, and prosodic tags representing the underlying hierarchical prosodic structures of utterances. Subsequently, a sequential optimization algorithm is employed to train the HPM based on a large conversational speech corpus, the Mandarin Conversational Dialogue Corpus (MCDC), which features orthographic transcriptions and prosodic event annotations. In this unsupervised training method, all utterances of the MCDC are labeled with two types of prosodic tags, namely, break and prosodic states, automatically and simultaneously. After training, the HPM parameters are examined to identify critical prosodic properties of Mandarin spontaneous speech, which are then compared with their counterparts in the read-speech HPM. The prosodic tags on the studied utterances enable mapping of various prosodic events onto the hierarchical prosodic structures of the utterances. Prosodic analyses of some disfluent events are conducted using the prosodic tags affixed to the MCDC. Finally, an application of the HPM to assist in Mandarin spontaneous-speech recognition is discussed. Significant relative error rate reductions of 9.0%, 9.2%, 15.6%, and 7.3% are obtained for base-syllable, character, tone, and word recognition, respectively.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5099263
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2019
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    Ultra-sparse metamaterials absorber for broadband low-frequency sound with free ventilation
    Acoustical Society of America (ASA) ; 2021
    In:  The Journal of the Acoustical Society of America Vol. 150, No. 2 ( 2021-08-01), p. 1044-1056
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 150, No. 2 ( 2021-08-01), p. 1044-1056
    Abstract: An absorptive device for broadband low-frequency sound with ventilation is essential but challenging in acoustic engineering, which is subjected to the narrow-band limitation and difficulty of balancing high-efficiency absorption and excellent ventilation. Here, we have theoretically and experimentally demonstrated an ultra-sparse (with filling ratio of 53.7%) broadband metamaterial absorber which can efficiently absorb (absorptance  & gt;90%) sound energy ranging from 307 to 341 Hz, while enabling air to flow freely. The broadband absorber is constructed by parallel coupling four ventilated metamaterials absorbers (VMAs) showing different operating frequencies. Each VMA is composed of three folded Fabry–Pérot resonators as paste components, which are patched subsequently to the walls of a waveguide and correspondingly act as dark, middle, and bright modes following the coupled mode theory. In the VMA, the dark mode is highly over-damped to absorb sound energy, while the bright mode is highly under-damped to be an effective acoustic soft boundary, and the middle mode in-between should be slightly over-damped to strengthen the absorptions. Further investigation demonstrates that broadband high-efficiency absorption is robust against oblique incident angles. The proposed VMA provides a clear scheme for efficiently absorbing low-frequency sound while allowing free air flow simultaneously, which may prompt versatile applications in noise control.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0005850
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2021
    detail.hit.zdb_id: 1461063-2
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  • 5
    Online Resource
    Online Resource
    Voice recovery in eight Yucatan mini-pigs after vocal fold implantation surgery
    Acoustical Society of America (ASA) ; 2023
    In:  The Journal of the Acoustical Society of America Vol. 153, No. 3_supplement ( 2023-03-01), p. A358-A358
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 153, No. 3_supplement ( 2023-03-01), p. A358-A358
    Abstract: As there currently exists no standardized framework to assess pig voice health, and voice parameters designed for humans do often not work on aperiodic pig voice, new approaches must be developed. We performed cell-based outer vocal fold replacement (COVR) surgery in six Yucatan mini-pigs (with two pigs in the control group) and tracked functional and structural voice recovery over up to six months. Recovery of voice function was assessed by tracking acoustic parameters and spectrograms in three pigs. Structural recovery was assessed by histologic analysis and Amino Acid Quantitation after harvest of vocal fold tissue in three pigs each. The results of functional analysis reflect expected voice worsening right after surgery and gradual recovery in one pig that was tracked the longest. Structural analysis shows small differences in fiber directionality between control group and pigs after surgery. Increasing amounts of detected amino acid markers for collagen and elastin over time after surgery may hint on gradual structural recovery. With this preliminary work, we form the basis for a larger long-term pre-clinical safety and efficacy study of COVR implantation.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0019152
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2023
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  • 6
    Online Resource
    Online Resource
    Safe multi-agent reinforcement learning for multi-robot control
    Elsevier BV ; 2023
    In:  Artificial Intelligence Vol. 319 ( 2023-06), p. 103905-
    Details
    In: Artificial Intelligence, Elsevier BV, Vol. 319 ( 2023-06), p. 103905-
    Type of Medium: Online Resource
    ISSN: 0004-3702
    URL: Article
    DOI: 10.1016/j.artint.2023.103905
    RVK:
    EQ 1000
    RVK:
    SA 2940
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 1468341-6
    detail.hit.zdb_id: 218797-8
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  • 7
    Online Resource
    Online Resource
    Manipulation of microbubbles and targeted single cell sonoporation with by surface acoustic waves in a microfluidic device
    Acoustical Society of America (ASA) ; 2016
    In:  Journal of the Acoustical Society of America Vol. 140, No. 4_Supplement ( 2016-10-01), p. 3149-3149
    Details
    In: Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 140, No. 4_Supplement ( 2016-10-01), p. 3149-3149
    Abstract: A microfluidic device was developed to transport the aggregated microbubbles to a targeted cell at arbitrary location in liquid solution by introducing the phase-shift to a planar standing surface acoustic wave (SAW). The device consists of two perpendicular pairs of interdigital transducer (IDTs) and a polydimethyl-siloxane microchannel. By adjusting the relative phase between electric voltages applied to the independent IDTs, the microbubbles can be trapped, continuously moved or rotated due to the translation of pressure nodes. We further demonstrate that a SAW is capable of inducing microbubble cluster destruction at a desired location to achieve a single cell’s reparable sonoporation. By controlling the position of the microbubble cluster relative to the targeted cell precisely, the effective size of the collapsing microbubbles is measured to be less than 0.68 times the diameter of microbubble cluster. The sonoporation efficiency and the cell viability are 82.4%± 6.5% and 90%±8.7%, respectively, when the targeted cell is within the effective microbubble destruction region.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4969876
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2016
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  • 8
    Online Resource
    Online Resource
    Single-channel noise reduction using optimal rectangular filtering matrices
    Acoustical Society of America (ASA) ; 2013
    In:  The Journal of the Acoustical Society of America Vol. 133, No. 2 ( 2013-02-01), p. 1090-1101
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 133, No. 2 ( 2013-02-01), p. 1090-1101
    Abstract: This paper studies the problem of single-channel noise reduction in the time domain and presents a block-based approach where a vector of the desired speech signal is recovered by filtering a frame of the noisy signal with a rectangular filtering matrix. With this formulation, the noise reduction problem becomes one of estimating an optimal filtering matrix. To achieve such estimation, a method is introduced to decompose a frame of the clean speech signal into two orthogonal components: One correlated and the other uncorrelated with the current desired speech vector to be estimated. Different optimization cost functions are then formulated from which non-causal optimal filtering matrices are derived. The relationships among these optimal filtering matrices are discussed. In comparison with the classical sample-based technique that uses only forward prediction, the block-based method presented in this paper exploits both the forward and backward prediction as well as the temporal interpolation and, therefore, can improve the noise reduction performance by fully taking advantage of the speech property of self correlation. There is also a side advantage of this block-based method as compared to the sample-based technique, i.e., it is computationally more efficient and, as a result, more suitable for practical implementation.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4773269
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2013
    detail.hit.zdb_id: 1461063-2
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  • 9
    Online Resource
    Online Resource
    Lake test of 70 kHz correlation velocity log for AUV
    Acoustical Society of America (ASA) ; 2012
    In:  The Journal of the Acoustical Society of America Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3485-3485
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3485-3485
    Abstract: A 70 kHz correlation velocity log (CVL) for AUV has recently been developed. The hardware design and signal processing were discussed. Localized least mean squares (LLMS) algorithm was proposed as the criterion of velocity estimation. The CVL underwent lake trials in Qiandao Lake Sea both on a ship and an AUV in Aug 2011. The CVL was calibrated. Trackline test, varying speed cruise test and drifting test were carried out to examine the performance of the CVL. The uncertainty statistics from the lake trial showed that the velocity accuracy of the CVL was about 0.8%V. This work was supported by Knowledge Innovation Project of Chinese Academy of Sciences.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4709157
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2012
    detail.hit.zdb_id: 1461063-2
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  • 10
    Online Resource
    Online Resource
    English for Academic Research: Grammar Exercises Adrian Wallwork. New York, NY: Springer Science+Business Media, 2013.
    Wiley ; 2015
    In:  TESOL Journal Vol. 6, No. 1 ( 2015-03), p. 188-192
    Details
    In: TESOL Journal, Wiley, Vol. 6, No. 1 ( 2015-03), p. 188-192
    Type of Medium: Online Resource
    ISSN: 1056-7941
    URL: Issue
    URL: Article
    DOI: 10.1002/tesj.2015.6.issue-1
    DOI: 10.1002/tesj.183
    RVK:
    EQ 1000
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 2548108-3
    SSG: 7,24
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