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Temporal analysis, manipulation, and resynthesis of musical vibrato

Proceedings of Meetings on Acoustics 2014年第1期22卷

作者： Mingfeng Zhang Mark Bocko James Beauchamp 1Department of Electrical and Computer Engineering Edmund A. Hajim School of Engineering and Applied Sciences University of Rochester Rochester NY USA mzhang43@hse.rochester.edu 2Department of Electrical and Computer Engineering Edmund A. Hajim School of Engineering and Applied Sciences University of Rochester Rochester NY USA mark.bocko@rochester.edu 3Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign UrbanaIL USA jwbeauch@manfred.music.uiuc.edu

Vibrato is an important music performance technique for both voice and various music instruments. In this paper, a signal processing framework for vibrato analysis, manipulation and resynthesis is presented. In the analysis part, music vibrato is treated as a generalized descriptor of music timbre and the signal magnitude and instantaneous frequency are implemented as temporal features. Specifically, the magnitude track shows the dynamic variations of audio loudness, and the frequency track shows the frequency deviations varying with time. In the manipulation part, several manipulation methods for the magnitude track and the frequency track are implemented. The tracking results are manipulated in both the time- and the frequency-domain. These manipulation methods are implemented as an interactive process to allow musicians to manually adjust the processing parameters. In the resynthesis part, the simulated vibrato audio is created using sinusoidal resynthesis process. The resynthesis part serves three purposes: to imitate human music performance, to migrate sonic features across music performances, and to serve as creative audio design tools, e.g., to create non-existing vibrato characteristics. The source audio from human music performance and the resynthesized audio are compared using subjective listening tests to validate our proposed framework.

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Modeling and simulation of droplet wettability using multiphase Lattice Boltzmann method (LBM)

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AIP Conference Proceedings 2019年第1期2192卷

作者： Kumara Ari Yuana Eko Prasetyo Budiana Deendarlianto Indarto 1Department of Mechanical and Industrial Engineering Faculty of Engineering Gadjahmada University (Jl. Grafika 2 Yogyakarta 55281 Indonesia) 2Department of Informatics Faculty of Computer Science Amikom Yogyakarta University (Jl. Ringroal Utara Condongcatur Sleman Yogyakarta Indonesia) 3Departement of Mechanical Engineering Faculty of Engineering Sebelas Maret University (Jl. Ir. Sutami 36A Surakarta 57126 Indonesia)

Droplet as the most elementary substance that comprises spray is very important to investigate in engineering and industrial. The applications examples are in spray cooling and spray coating or painting. Droplet characteristics when pinning onto a surface could be hydrophobic, neutral or hydrophilic. In the present work were modeled and simulated the droplet when attached to the surface using multiphase LBM. The pseudo-potential method was used to treat two-phase substance, and the Carnahan-Starling equation of state (EOS) was used to treat both coexistence substance. The validation was used the spurious current that very important in numerical stability. The results were presented in three conditions: hydrophobic, neutral and hydrophilic.

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Simulation of internal solitary waves with negative polarity in slowly varying medium

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AIP Conference Proceedings 2018年第1期2013卷

作者： M. H. Hooi W. K. Tiong K. G. Tay S. N. Sze K. L. Chiew 1Faculty of Computer Science and Information Technology Universiti Malaysia Sarawak 94300 Kota Samarahan Sarawak Malaysia 2Department of Communication Engineering. Faculty of Electric and Electronic UniversitiTun Hussein Onn Malaysia 86400 Parit Raja Johor Malaysia

We consider the propagation of an internal solitary wave over two different types of varying depth regions, i.e. a gentle monotonic bottom slope connecting two regions of constant depth in two-layer fluid flow and a smooth bump. Here, we let the depth of the upper layer is smaller than the lower layer such that an internal solitary wave of negative polarity is generated. The appropriate model for this problem is the variable-coefficient extended Korteweg-de Vries equation, which is then solved numerically using the method of lines. Our numerical results show different types of transformation of the internal solitary wave when it propagates over the varying depth region depending on the depth of the lower layer after the varying depth region including generation of solitary wavetrain, adiabatic and non-adiabatic transformation of the internal solitary wave.

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Erratum: “Review of using gallium nitride for ionizing radiation detection” [Appl. Phys. Rev. 2, 031102 (2015)]

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Applied Physics Reviews 2019年第2期6卷

作者： Jinghui Wang Padhraic Mulligan Leonard Brillson Lei R. Cao 1Nuclear Engineering Program Department of Mechanical and Aerospace Engineering The Ohio State University Columbus Ohio 43210 USA 2Department of Radiology Stanford University Stanford California 94305 USA 3Department of Electrical and Computer Engineering The Ohio State University Columbus Ohio 43210 USA 4Department of Physics The Ohio State University Columbus Ohio 43210 USA

The authors replace Table II and its discussion paragraph from their original article1 in order to incorporate the correct information.

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Surface morphological and elemental analysis of thermally evaporated Cu2O: Ag thin films

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AIP Conference Proceedings 2023年第1期2475卷

作者： Alaa Nihad Tuama Khalid Haneen Abass Doaa Nihad Tuama Mohd Arif Bin Agam 1Department Of Physics Faculty Of Applied Sciences And Technology Universiti Tun Hussein OnnMalaysia 84600 Pagoh Johor Malaysia. 2Department Of Computer Technical Engineering College Of Technical Engineering The Islamic University 54001 Najaf Iraq. 3Department Of physics College Of Education For Pure Sciences University Of Babylon Hillah Iraq

Pure cuprous oxide (Cu2O) and doped with silver nanoparticles (Cu2O:Ag) thin films at an average thickness of (60±3) nm were fabricated using vacuum thermal evaporation technique at a deposition rate of 0.5 nm/s, then the deposited films were annealed at 573 K for 2.5 h. The regular surface morphology of the fabricated films was obtained using controlled thermal evaporation parameters. High-resolution FESEM images combined with the 3D AFM images demonstrated the surface morphology, roughness, shape, and size of the evaporated material. The surface morphological, elemental, and morphology analysis of the fabricated films of the deposited films exhibit the growth of pure and Ag-doped Cu2O films with large surface diffusion on the used substrates. The thermal evaporation process can proceed continuously under high vacuum ambient providing an economic and easy method to fabricate high purity Cu2O films. As-grown films surface exhibited a smooth morphology and occur with homogeneous clusters that are uniformly distributed with a grain size of about (18-24 nm). The As-grown film homogeneity was obtained by controlling the deposition at low-pressure circumstances (1×10−7 mbar). The observed morphological and topology properties could give rise to use of the fabricated pure and Ag-doped Cu2O films as active layers in solar cell devices and optoelectronic applications.

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Estimation of climate change impact on the flood of Kickapoo River at La Farge

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AIP Conference Proceedings 2022年第1期2463卷

作者： Sivapragasam C. Saravanan P. Balamurali S. 1Center for Water Technology Kalasalingam Academy of Research and Education Srivilliputtur-626126 India 2Department of Civil Engineering Kalasalingam Academy of Research and Education Srivilliputtur-626126 India 3Department of Computer Applications Kalasalingam Academy of Research and Education Srivilliputtur-626126 India

Predicting the impact of climate change in a particular river is necessary to adapt and mitigate the future floods. In this study the climate change impact on Kickapoo River is estimated using the rainfall forcing of RCP 4.5 scenario. Towards this a new methodology is framed to simulate discharge in the river using Artificial Neural Network which uses the knowledge of predictability of the time series as well. Four different bias correction methods, including an ANN based bias correction method is evaluated to reduce the biases in the rainfall forcing series obtained from Global Circulation Model and the best out of the four applied to bias correct the whole series. Simulation of discharge is done till the year 2099. It is found the Kickapoo River flow may likely go low in future due to climate change.

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Doppler tracking and compensation for underwater acoustic channels using shift-orthogonal pilot sequences

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Proceedings of Meetings on Acoustics 2020年第1期42卷

作者： Ali Mohamad Bassam Mae L. Seto 1Department of Electrical & Computer Engineering Dalhousie University Halifax Nova Scotia B3H4R2 CANADA al903300@dal.ca 2Department of Mechanical Engineering Halifax Nova Scotia B3J1Z1 CANADA mz715250@cs.dal.ca

A novel time-domain Doppler tracker and compensator, using shift-orthogonal OFDM pilot sequences, was developed and assessed in simulations and early in-water trials. The objective is to address large Mach numbers like those experienced in the acoustic communications of autonomous underwater vehicles (AUV). To start, the Doppler estimator extracts pilots in the received signal to produce Mach number estimates for every received signal sample. Given the large number of estimator samples, a Doppler tracker is proposed to reduce the number and simultaneously track Mach number variations. This novel tracker reduces the computational load on the compensator and makes it possible to implement on AUVs. Then, the Doppler compensator's first stage resamples the received signal using the Mach number estimates from the tracker's output. Since the estimates vary with time, the resampling performed is time-varying. Then, the final stage estimates the residual Doppler shift from the estimator and eliminates it with a phase rotation. The proposed receiver subsystem outperforms most existing compensators as measured through the mean-squared error, is more computationally efficient and addresses higher Mach numbers. Each element of the proposed receiver is tested in simulations and the results are shown to agree with theory. Comprehensive at-sea trials are next.

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The correlation of blue shift of photoluminescence and morphology of silicon nanoporous

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AIP Conference Proceedings 2016年第1期1733卷

作者： Batool E. B. Al-Jumaili Zainal A. Talib Josephine L. Y. Suriati B. Paiman Naser M. Ahmed Abdulmajeed H. J. Al-Jumaily Asmiet Ramizy Sinan A. Abdulateef Ibrahim B. Muh’d Manahil E. E. Mofdal 1Department of Physics (UPM) Serdang Selangor 43400 Malaysia 4Department of Physics Anbar University Iraq 3School of Physics USM 11800 Penang Malaysia 2Department of Computer and Communication Systems Engineering Universiti Putra Malaysia (UPM) Serdang Selangor 43400 Malaysia

Porous silicon with diameters ranging from 6.41 to 7.12 nm were synthesized via electrochemical etching by varied anodization current density in ethanoic solutions containing aqueous hydrofluoric acid up to 65mA/*** luminescence properties of the nanoporous at room temperature were analyzed via photoluminescence spectroscopy. Photoluminescence PL spectra exhibit a broad emission band in the range of 360-700 nm photon energy. The PL spectrum has a blue shift in varied anodization current density; the blue shift incremented as the existing of anodization although the intensity decreased. The current blue shift is owning to alteration of silicon nanocrystal structure at the superficies. The superficial morphology of the PS layers consists of unified and orderly distribution of nanocrystalline Si structures, have high porosity around (93.75%) and high thickness 39.52 µm.

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Porous cylinder subjected to conjugate heat transfer-part I

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AIP Conference Proceedings 2019年第1期2200卷

作者： Maughal Ahmed Ali Baig Azeem B. Sridhar Babu M. Gowtha Muneswara Rao 1Department of Mechanical Engineering CMR Technical Campus Hyderabad India 2Department of Mathematics and Computer Science Taylor’s University No. 1 Jalan Taylor’s Subang Jaya - 47500 Selangor DarulEhsan Malaysia 3Department of Mechanical Engineering CMR Institute of Technology Hyderabad India 4Department of Mechanical Engineering CMR Technical Campus Hyderabad India

This article deliberates the investigation of heat transfer in porous annular cylinder subjected to conjugate heat transfer at inner surface. The heating condition is such that the outer surface of the cylinder is heated to constant temperature and inner surface at cold temperature. The heat transfer occurs from outer surface to the inner surface through a solid being attached at inner radius. This article discusses the effect of physical parameters which are taken in terms of dimensionless parameters on heat transfer behavior. The interface of porous and solid wall is applied with proper boundary condition to make sure that there is no storage of heat due to dissimilar mediums.

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An Accurate Correlation-Type Doppler Estimator in Dynamic Underwater Acoustic Channels using Comb-Type Shift-Orthogonal Pilot Signals

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Proceedings of Meetings on Acoustics 2020年第1期40卷

作者： Ali Mohamad Bassam Christian Schlegel Mae Seto 1Department of Electrical & Computer Engineering Dalhousie University Halifax Nova Scotia B3H4R2 CANADA al903300@dal.ca 2Department of Electrical Engineering Dalhousie University Halifax Nova Scotia CANADA christian.b.schlegel@*** 3Department of Mechanical Engineering Dalhousie University Halifax Nova Scotia CANADA mae.seto@dal.ca

This paper presents a practical and accurate Doppler estimator for signals propagating in underwater acoustic (UWA) channels. Estimation is performed with relatively short shift-orthogonal pilot sequences due to their correlation properties. Pilot bursts are OFDM (orthogonal frequency division multiplexing). The receiver performs Doppler estimation by cross-correlating the received signal with the known pilot signal, resulting in a Doppler phase estimate from which the Mach number is determined in real-time. The estimator operates at the sample rate of the signal, which yields a Mach number estimate every sample. Therefore, instantaneous changes in the Mach number are known, thereby allowing the tracking of Doppler effects in dynamic channels. A design criterion for the estimator’s validity is derived, which relates bandwidth, carrier frequency and sequence length with Mach number. A MATLAB Simulink model of the estimator is presented. The results show its performance in synthetic channels that simulate relative motion between transmitter and receiver. The Cramer-Rao lower bound (CRLB) analysis shows the estimator achieving a variance below 10 -4 for SNRs above 20 dB. This is a near-optimal estimator. Additionally, compared to other estimators, the computational complexity is considerably lower and the range of valid Mach numbers that it can address is higher.

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