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Articles de revues sur le sujet « Excitation du source glottique »

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Auteur : Grafiati

Publié le 25 mai 2024

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1

Verspeek, Simon, Jeroen Peeters, Bart Ribbens et Gunther Steenackers. « Excitation Source Optimisation for Active Thermography ». Proceedings 2, n^o 8 (11 juin 2018) : 439. http://dx.doi.org/10.3390/icem18-05325.

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2

Pati, Debadatta, et SR Mahadeva Prasanna. « Speaker Recognition from Excitation Source Perspective ». IETE Technical Review 27, n^o 2 (2010) : 138. http://dx.doi.org/10.4103/0256-4602.60167.

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3

Pati, Debadatta, et S. R. Mahadeva Prasanna. « Speaker verification using excitation source information ». International Journal of Speech Technology 15, n^o 2 (8 mars 2012) : 241–57. http://dx.doi.org/10.1007/s10772-012-9137-5.

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4

Greer, Joshua S., Georgi I. Petrov et Vladislav V. Yakovlev. « Raman spectroscopy with LED excitation source ». Journal of Raman Spectroscopy 44, n^o 7 (14 juin 2013) : 1058–59. http://dx.doi.org/10.1002/jrs.4327.

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5

WAGATSUMA, Kazuaki. « Excitation mechanisms on emission lines observed with a glow discharge excitation source. » Bunseki kagaku 41, n^o 8 (1992) : 353–70. http://dx.doi.org/10.2116/bunsekikagaku.41.8_353.

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6

Yong-Qing, Wang, Pu Yong-Ni, Sun Rong-Xia, Tang Yu-Jun, Chen Wen-Jun, Lou Jian-Zhong et Ma Wen. « A Microfabricated Inductively Coupled Plasma Excitation Source ». Chinese Physics Letters 25, n^o 1 (janvier 2008) : 202–4. http://dx.doi.org/10.1088/0256-307x/25/1/055.

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7

Kim, Joong H., Arup Polley et Stephen E. Ralph. « Efficient photoconductive terahertz source using line excitation ». Optics Letters 30, n^o 18 (15 septembre 2005) : 2490. http://dx.doi.org/10.1364/ol.30.002490.

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8

Li, Cai, Huang Xiao et Meng Lijun. « Response Analysis of a Plate Structure under Double Source Excitation by FBG Sensors ». International Journal of Online Engineering (iJOE) 14, n^o 07 (27 juillet 2018) : 108. http://dx.doi.org/10.3991/ijoe.v14i07.8968.

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The nondestructive assessments play a key role for condition monitoring of in-service structures. At present, many non-destructive testing methods have been widely applied, but actual operation environment has the characteristics of multiple random, which makes the effects of multiple excitation sources. While the traditional detection methods only consider the main sources of motivation and ignore the other sources, which will bring a bigger error. So the multi-source excitation method has practical significance. Here this paper puts forward a double source excitation technique for plate structure based on fiber Bragg grating sensor, which is used to receive the waves in the plate. First, measuring principle of double source excitation and demodulation principle of the FBG sensor are introduced. Then simulation analysis in the double source excitation field is devoted, whose results lay the foundation for the detection in the plate. On this basis, the experimental system is built and the influence of different parameters are analyzed such as frequency, phase. Then this double source excitation-FBG sensing technique is applied to damage detection by envelope analysis, whose result show that this double source excitation-FBG sensing method for the plate structure is sensitive to crack damage.

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9

Obeidat, Safwan, Baolong Bai, Gary D. Rayson, Dean M. Erson, Adam D. Puscheck, Serge Y. Landau et Tzach Glasser. « A Multi-Source Portable Light Emitting Diode Spectrofluorometer ». Applied Spectroscopy 62, n^o 3 (mars 2008) : 327–32. http://dx.doi.org/10.1366/000370208783759722.

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A portable luminescence spectrofluorometer weighing only 1.5 kg that uses multiple light emitting diodes (LEDs) as excitation sources was developed and evaluated. Excitation using a sequence of seven individual broad-band LED emission sources enabled the generation of excitation-emission spectra using a light weight (<1.5 kg) spectrometer. Limits of detection for rhodamine 6G, rhodamine B, and fluorescein were 2.9, 3.2, and 11.0 nM, respectively. Generation of excitation-emission matrices (EEMs) enabled the analysis of samples containing mixtures of rhodamine B and fluorescein. Buffered saline plant and animal feed extracts were also analyzed using this instrument. These samples included the woody plants Pistacia lentiscus (Evergreen pistache or Mastic) and Philyria latifolia, and the herbaceous species Medicago sativa (alfalfa), Trifolium spp. (clover), and a feed concentrate. Application of multi-way principal component analysis (MPCA) to the resulting three-dimensional data sets enabled discernment among these various diet constituents.

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10

Witherspoon, Kenny C., Brian J. Cross et Mandi D. Hellested. « Combined Electron Excitation and X-Ray Excitation for Spectrometry in the SEM ». Microscopy Today 21, n^o 4 (juillet 2013) : 24–28. http://dx.doi.org/10.1017/s1551929513000709.

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Energy-dispersive X-ray spectrometry (EDS) is an analytical technique used to determine elemental composition. It is a powerful, easy-to-use, non-destructive technique that can be employed for a wide variety of materials. In this technique the electron beam of the scanning electron microscope (SEM) impinges on the sample and excites atomic electrons causing the production of characteristic X rays. These characteristic X rays have energies specific to elements in the sample. The EDS detector collects these X rays as a signal and produces a spectrum. Samples also can be excited by X rays. Collimated and focused X rays from an X-ray source produce characteristic X rays that can be detected by the same EDS detector. When X rays are used as the source of excitation, the method is then called X-ray fluorescence (XRF) or micro-XRF.

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11

Wang, Yong Qing, Na Chong, Li Mei Dong, Yu Jun Tang et Hai Jun Song. « Study on Electronic Excitation Temperature of Argon Plasma Using Low Pressure Micro-ICP Excitation Source ». Advanced Materials Research 383-390 (novembre 2011) : 1844–48. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.1844.

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Electronic excitation temperature is an important indicator of the spectrometer excitation source. This work experimented self-made micro-ICP excitation spectroscopy based on PCB technology, and detected 17 spectral lines in 690~860 nm of argon atom. 763.51 nm and 772.42 nm spectral lines whose wavelengths are close to were used to calculate electronic excitation temperature of argon excited by micro-ICP, and results show in 1600~3000 K. Experimental test data shows effects of argon gas pressure on electronic excitation temperature that in 20~210 Pa electronic excitation temperature increases with pressure on the whole. When argon pressure is greater than 220 Pa, plasma flame flickers and the electronic excitation temperature shows greater fluctuation; Experimental test shows effects of RF power on electronic excitation temperature that in 3~23 W electronic excitation temperature gradually increases with RF power. Causes of electronic excitation temperature with pressure, RF power variation are analyzed.

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12

Slanger, Tom G. « Vibrational excitation in ». Canadian Journal of Physics 64, n^o 12 (1 décembre 1986) : 1657–63. http://dx.doi.org/10.1139/p86-289.

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Excitation processes for [Formula: see text] in aurorae, in the nightglow, and in laboratory sources are discussed. It is shown that the observed vibrational distribution in aurorae is consistent with the [Formula: see text] + NO charge-transfer mechanism. Arguments are presented for the case that quenching of O2(b) in vibrational levels above ν′ = 1 is rapid, and that therefore the auroral source is much larger than previously supposed. It is suggested that oxygen atoms are an efficient quencher for O2(b) levels above ν′ = 1.

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13

Xu, Taibai, Dongju Gao, Yi Chen, Weiwei Zhang, Fei Xu et Peng Zhou. « Vibration Response of the Crawler Combine Chassis Frame Excited by the Engine ». International Journal of Rotating Machinery 2021 (13 février 2021) : 1–12. http://dx.doi.org/10.1155/2021/6675003.

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There are many problems of vibration and noise in combine working. As the main power source and excitation source of a combine, the working state of an engine directly affects the reliability and stability of the whole harvester. In order to analyze the vibration response characteristics of a chassis frame under engine excitation, the vibration mechanism and theoretical excitation characteristics of an engine vibration source on a crawler combine harvester are analyzed in this paper, and the vibration response of chassis under engine excitation is tested and analyzed. After theoretical derivation, a two-degree-of-freedom dynamic model of an engine and chassis is established. The experimental results show that the up and down vibration generated by the engine is the main vibration source in the Z direction, and the main excitation frequency is the second-order firing frequency. This paper provides a theoretical reference and experimental basis for vibration reduction and noise reduction of combine and vibration characteristics of the chassis frame.

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14

STEERS, EDWARD B. M., et FRANZ LEIS. « Modulated Glow Discharge Source With Supplementary Microwave Excitation ». Journal of Analytical Atomic Spectrometry 12, n^o 3 (1997) : 307–12. http://dx.doi.org/10.1039/a606773e.

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15

Egalon, Claudio O. « Excitation efficiency of an optical fiber core source ». Optical Engineering 31, n^o 6 (1992) : 1328. http://dx.doi.org/10.1117/12.56177.

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16

Gerson, Ira A. « Digital speech coder having improved vector excitation source ». Journal of the Acoustical Society of America 91, n^o 3 (mars 1992) : 1790. http://dx.doi.org/10.1121/1.403747.

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17

Wang, J., Z. Lin et D. Howe. « Characteristics of linear compressors under current source excitation ». Proceedings of the Institution of Mechanical Engineers, Part A : Journal of Power and Energy 221, n^o 7 (janvier 2007) : 1057–65. http://dx.doi.org/10.1243/09576509jpe423.

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18

Gerson, Ira A. « Digital speech coder having improved vector excitation source ». Journal of the Acoustical Society of America 88, n^o 5 (novembre 1990) : 2512. http://dx.doi.org/10.1121/1.400026.

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19

Raykar, V. C., B. Yegnanarayana, S. R. M. Prasanna et R. Duraiswami. « Speaker localization using excitation source information in speech ». IEEE Transactions on Speech and Audio Processing 13, n^o 5 (septembre 2005) : 751–61. http://dx.doi.org/10.1109/tsa.2005.851907.

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20

Padooru, Yashwanth R., Alexander B. Yakovlev, Pai-Yen Chen et Andrea Alù. « Line-source excitation of realistic conformal metasurface cloaks ». Journal of Applied Physics 112, n^o 10 (15 novembre 2012) : 104902. http://dx.doi.org/10.1063/1.4765688.

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21

Nandi, Dipanjan, Debadatta Pati et K. Sreenivasa Rao. « Implicit excitation source features for robust language identification ». International Journal of Speech Technology 18, n^o 3 (17 juin 2015) : 459–77. http://dx.doi.org/10.1007/s10772-015-9288-2.

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22

Graf, Hans R., et Samir Ziada. « Excitation source of a side-branch shear layer ». Journal of Sound and Vibration 329, n^o 14 (juillet 2010) : 2825–42. http://dx.doi.org/10.1016/j.jsv.2010.01.033.

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23

Hien, P. Z., N. T. Anh, D. D. Thao et T. Truong. « X-ray fluorescence /XRF/ analysis with71Ge excitation source ». Journal of Radioanalytical and Nuclear Chemistry Letters 118, n^o 3 (juillet 1987) : 217–24. http://dx.doi.org/10.1007/bf02169558.

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24

Jiang, Guohe, Yuhao Yuan, Hao Guo, Gang Wu et Zhenzhen Liu. « Vibration Characteristic Research of 100 m New Polar Exploration Cruise Based on Finite Element Modeling ». Journal of Marine Science and Engineering 12, n^o 5 (7 mai 2024) : 779. http://dx.doi.org/10.3390/jmse12050779.

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Luxury cruise ships are high-end passenger ships with facilities on board for the leisure and entertainment of passengers, so the comfort of luxury cruise ships is a matter of great concern. In this paper, a finite element model of a new polar exploration cruise ship is established, and the wet modes of the whole ship are calculated using the virtual mass method and compared with the principal frequencies of the excitation forces to initially verify the rationality of the design of the structural vibration characteristics of the whole ship. The admittance matrix of the vibration velocity to excitation force was calculated by a frequency response analysis, and the vibration velocities at the stern plate and main engine foundations were tested during sailing. Then, the obtained propeller and main engine excitation forces were loaded into the finite element model; the vibration velocities of each compartment were calculated and compared with the compartment vibration velocity test values. The errors were within the engineering allowable range, verifying the accuracy of the excitation forces. The propeller and main engine excitation forces were loaded separately on the finite element model to calculate the vibration velocity of each cabin, and the contribution of the two excitation sources to the vibration velocity of each cabin was analyzed. It was found that the contribution of the excitation source to the cabin response was related to the relative position between the cabin and the excitation source. When the cabin was located in the cabin adjacent to or directly above a certain excitation source, the contribution of the excitation source to the cabin response was greater. When the cabin was farther away from both excitation sources, the contribution of the propeller excitation was greater. This provides a targeted reference for the preliminary vibration assessment and later vibration control of the new polar expedition cruise ship.

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25

Redondo Plaza, Alberto, Victor Ndeti Ngungu, Sara Gallardo Saavedra, José Ignacio Morales Aragonés, Víctor Alonso Gómez, Lilian Johanna Obregón et Luis Hernández Callejo. « Partial Photoluminescence Imaging for Inspection of Photovoltaic Cells : Artificial LED Excitation and Sunlight Excitation ». Energies 16, n^o 11 (5 juin 2023) : 4531. http://dx.doi.org/10.3390/en16114531.

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Photovoltaic power is a crucial renewable energy source that has the potential to enhance a city’s sustainability. However, in order to identify the various issues that may occur during the lifespan of a photovoltaic module, solar module inspection techniques are crucial. One valuable technique that is commonly used is luminescence, which captures silicon emissions. This article focuses on a specific luminescence technique called partial photoluminescence. This technique involves illuminating a specific portion of the solar cell surface and recording the luminescence emission generated in the remaining area. This method has been trialed in a laboratory environment, utilizing infrared LEDs as the excitation source. An analysis of the main parameters that affect the technique is provided, where pictures have been taken under varying exposure times ranging from 50 ms to 400 ms, irradiance levels ranging from 200 W/m2 to 1000 W/m2, and a percentage of illuminated cells ranging from 10% to 40%. Furthermore, the experimental device has been modified to generate images utilizing sunlight as the excitation source. Several pictures of damaged cells were taken under an irradiance range of 340 W/m2 to 470 W/m2. The quality of the partial photoluminescence images is comparable to conventional electroluminescence images, but longer exposure times are required.

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26

Yanovskaya, T. B., F. Romanelli et G. F. Panza. « Tsunami excitation by inland/coastal earthquakes : the Green function approach ». Natural Hazards and Earth System Sciences 3, n^o 5 (31 octobre 2003) : 353–65. http://dx.doi.org/10.5194/nhess-3-353-2003.

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Abstract. In the framework of the linear theory, the representation theorem is derived for an incompressible liquid layer with a boundary of arbitrary shape and in a homogeneous gravity field. In addition, the asymptotic representation for the Green function, in a layer of constant thickness is obtained. The validity of the approach for the calculation of the tsunami wavefield based on the Green function technique is verified comparing the results with those obtained from the modal theory, for a liquid layer of infinite horizontal dimensions. The Green function approach is preferable for the estimation of the excitation spectra, since in the case of an infinite liquid layer it leads to simple analytical expressions. From this analysis it is easy to describe the peculiarities of tsunami excitation by different sources. The method is extended to the excitation of tsunami in a semiinfinite layer with a sloping boundary. Numerical modelling of the tsunami wavefield, excited by point sources at different distances from the coastline, shows that when the source is located at a distance from the coastline equal or larger than the source depth, the shore presence does not affect the excitation of the tsunami. When the source is moved towards thecoastline, the low frequency content in the excitation spectrum ecreases, while the high frequencies content increases dramatically. The maximum of the excitation spectra from inland sources, located at a distance from the shore like the source depth, becomes less than 10% of that radiated if the same source is located in the open ocean. The effect of the finiteness of the source is also studied and the excitation spectrum is obtained by integration over the fault area. Numerical modelling of the excitation spectra for different source models shows that, for a given seismic moment, the spectral level, as well as the maximum value of the spectra, decreases with increasing fault size. When the sources are located in the vicinity of a shore, the synthetic mareograms calculated at distances greater than the source depth show that the maximum tsunami amplitude decays with decreasing source-to-shore distance. The rate of decay is dependent on the dip, length and depth of the fault. The tsunami intensity, defined as maximum peak-to-peak amplitude, decays with the inland distance of the source from the coast. At an inland distance equal to the source depth, it becomes 4–5 times less than that from a source in the open ocean. If the source is located under the coastline, the intensity of tsunami is approximately the same as for oceanic sources.

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Cao, Jing Wen, Shao Wei Liao, Chung Yi Chung, Hwa Sheng Gau, Chun Yen Chiu et Wen Liang Lai. « Specific Fluorescent Fingerprint of Organic Matter in Advanced Water Treatment and its Molecular Weight ». Applied Mechanics and Materials 448-453 (octobre 2013) : 317–21. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.317.

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In this research, the UV absorbance values of wavelength at 210 and 254 nm, excitation emission fluorescent matrix were measured for source water and treated water in CCL (Cheng Ching Lake) water treatment plant during five months. The whole data produced from EEFM was analyzed by PARAFAC operated in MATLAB software. The variation of molecular weight for organic matter was measured by HPLC (high performance liquid chromatography) with UV and fluorescent detectors. Observed from the variation of UV210/UV254, high value in treated water compared with source water was found. More molecular weight less than 5 k Da was formed in the treated water with relative to source water. Also, both major components in source water were located at wavelengths of excitation/emission of 250/410 nm and 230/330 nm and those in treated water were 240/410 nm and 220/290 nm. Also, the fluorescent intensity, long excitation wavelength was higher than short excitation wavelength in source water. This phenomena was opposite with treated water.

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28

da Costa Ferreira, Douglas, Fábio Roberto Chavarette, Cláudio Henrique Cerqueira Costa Basquerotto et Nelson José Peruzzi. « Non-Ideal Excitation Approach for Piezoelectric Vibration Based Energy Harvesting ». Advanced Materials Research 936 (juin 2014) : 2160–64. http://dx.doi.org/10.4028/www.scientific.net/amr.936.2160.

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Common solution for energy harvester device is project design according harmonic excitation around natural frequency matching excitation source. Environment vibration is random and wide band causing short time of resonance in disagreement of project objectives. Control driven of energy harvesting to take advantage of the higher vibration range can results in greater energy converted. This study investigates a non-ideal excitation behavior and their efficiency in convert electricity via piezoelectric direct effect from the available system energy compared to harmonic excitation source. Numeric evaluation was performed based in bimorph piezoelectric beam in dimensionless consideration. Chaos behavior and harvest energy capability were compared from non-ideal to harmonic excitation. Results demonstrate considerable higher quantity of energy available for non-ideal approach compared to harmonic resonant design and encourages advance study to control and enhance energy from random and wide band vibration source.

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29

Zhou, Jian Min, Li Cai, Peng Li et Lin Hai Hu. « Electromagnetic Excitation for Infrared Thermography NDT ». Applied Mechanics and Materials 530-531 (février 2014) : 273–76. http://dx.doi.org/10.4028/www.scientific.net/amm.530-531.273.

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Electromagnetic excitation infrared thermography testing is a new nondestructive testing technology. The electromagnetic excitation impact the detection results directly. In order to obtain better detection results, electromagnetic excitation source was studied in depth by domestic and foreign scholars. In this paper, current research status of electromagnetic excitation source for infrared thermography NDT was introduced in simulation and experiment aspects. Then the research results of scholars domestic and abroad are summarized, the research contents remains to be studied are analyzed, aimed at promoting the development of the technology.

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30

Cui, Ziqiang, Pengyu Yang, Xuan Li et Huaxiang Wang. « An alternative excitation method for electrical impedance tomography ». Review of Scientific Instruments 93, n^o 4 (1 avril 2022) : 044710. http://dx.doi.org/10.1063/5.0083681.

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Electrical impedance tomography (EIT) can be utilized to image the conductivity distribution of material under test. The EIT measurements depend on the quality in the current injection and voltage measuring circuits. The current source plays a vital role in the EIT instruments. In most of the research studies, the push–pull current sources were employed for the source and sink signal generation. It usually requires frequent calibration to achieve proper functioning, especially for the sweeping frequency measurements. In this paper, an alternative excitation method has been proposed for simplifying the design of the current source in EIT instruments, which aims to achieve the performance of the push–pull current source by using a single-ended current source. It could offer the following advantages: (1) hardware simplification and (2) reduced requirements on current source calibration. The corrected measurements could be consistent with that using push–pull excitation, as confirmed by the numerical simulations. In addition, the reconstructed images have also been investigated to illustrate the effectiveness of the proposed method.

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31

Cui, Ziqiang, Pengyu Yang, Xuan Li et Huaxiang Wang. « An alternative excitation method for electrical impedance tomography ». Review of Scientific Instruments 93, n^o 4 (1 avril 2022) : 044710. http://dx.doi.org/10.1063/5.0083681.

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Electrical impedance tomography (EIT) can be utilized to image the conductivity distribution of material under test. The EIT measurements depend on the quality in the current injection and voltage measuring circuits. The current source plays a vital role in the EIT instruments. In most of the research studies, the push–pull current sources were employed for the source and sink signal generation. It usually requires frequent calibration to achieve proper functioning, especially for the sweeping frequency measurements. In this paper, an alternative excitation method has been proposed for simplifying the design of the current source in EIT instruments, which aims to achieve the performance of the push–pull current source by using a single-ended current source. It could offer the following advantages: (1) hardware simplification and (2) reduced requirements on current source calibration. The corrected measurements could be consistent with that using push–pull excitation, as confirmed by the numerical simulations. In addition, the reconstructed images have also been investigated to illustrate the effectiveness of the proposed method.

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32

Cui, Ziqiang, Pengyu Yang, Xuan Li et Huaxiang Wang. « An alternative excitation method for electrical impedance tomography ». Review of Scientific Instruments 93, n^o 4 (1 avril 2022) : 044710. http://dx.doi.org/10.1063/5.0083681.

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Electrical impedance tomography (EIT) can be utilized to image the conductivity distribution of material under test. The EIT measurements depend on the quality in the current injection and voltage measuring circuits. The current source plays a vital role in the EIT instruments. In most of the research studies, the push–pull current sources were employed for the source and sink signal generation. It usually requires frequent calibration to achieve proper functioning, especially for the sweeping frequency measurements. In this paper, an alternative excitation method has been proposed for simplifying the design of the current source in EIT instruments, which aims to achieve the performance of the push–pull current source by using a single-ended current source. It could offer the following advantages: (1) hardware simplification and (2) reduced requirements on current source calibration. The corrected measurements could be consistent with that using push–pull excitation, as confirmed by the numerical simulations. In addition, the reconstructed images have also been investigated to illustrate the effectiveness of the proposed method.

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33

Liu, Z., W. Wang, Q. Li, J. Wang, Y. Chen, R. Zhang et D. Zhou. « Seismic source of rock drill and its application in in-situ vibration monitoring of rock mass ». IOP Conference Series : Earth and Environmental Science 1331, n^o 1 (1 mai 2024) : 012024. http://dx.doi.org/10.1088/1755-1315/1331/1/012024.

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Abstract This study suggests the use of a seismic source of a rock drill as a new excitation method for real-time monitoring of the vibration frequency of rock masses in tunnel engineering. In this study, a laboratory rock drill seismic source test system was developed. The rock mass excitation and vibration response under real in situ stress were simulated, and a natural frequency test of different lithologic materials under various in situ stresses was carried out based on the developed system. Empirical equations for estimating natural frequency were established using regression analysis. The test results show that (1) the laboratory rock drill seismic source test system exhibits good performance and can simulate the horizontal excitation process of the tunnel rock drill. Rock drill excitation may be used as the seismic source to continuously measure the in-situ vibration information of the rock mass. (2) The natural frequency of rock is positively correlated with rock elastic modulus and geostress and negatively correlated with rock density. This is not directly related to the seismic source.

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34

Hai, Su. « Analysis of Seismic Responses During Near-Source Ground Motions ». Advanced Materials Research 482-484 (février 2012) : 1414–17. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1414.

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Seismic responses can strongly determine damages of bridge structures, e.g. due to pounding and unseating of girders as observed in many major earthquakes in the past. In the investigations often uniform ground excitation and pounding at only one location are considered. Studies on the influence of non-uniform ground excitation on bridge responses are still very limited, and they are restricted to flat ground-surface condition. Influence of multi-sided pounding is also not much investigated. If the impediment effect of abutments is considered at all. The study reveals that commonly assumed girder stiffness for the end restraint overestimates the actual effective end-restraint stiffness. Non-linear elastomeric bearings can significantly reduce the adjacent girder relative displacements. A consideration of non-uniform excitation is essential for a realistic estimation of bridge response and damage potential.

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35

Kliukas, Romualdas, Arūnas Jaras et Rimantas Kačianauskas. « INVESTIGATION OF TRAFFIC‐INDUCED VIBRATION IN VILNIUS ARCH‐CATHEDRAL BELFRY ». TRANSPORT 23, n^o 4 (31 décembre 2008) : 323–29. http://dx.doi.org/10.3846/1648-4142.2008.23.323-329.

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The influence of city traffic‐induced vibration on Vilnius Arch‐Cathedral Belfry is investigated. Two sources of dynamic excitation are studied. Conventional city traffic is considered to be a natural source of excitation while excitation imposed artificially by moving a heavily loaded truck is considered to be the source of increased risk excitation. The influence of induced vibrations is recorded by accelerometers located in various positions of the Belfry's structures and shown by accelerograms. Dynamic effects are evaluated by considering acceleration magnitudes and response spectra. A comparative analysis of both effects is presented and conclusions and recommendations are provided.

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36

Allen, G. Mark, et David M. Coleman. « Characterization of a Dual Inductively Coupled Plasma Atomic Emission Source ». Applied Spectroscopy 41, n^o 3 (mars 1987) : 381–87. http://dx.doi.org/10.1366/0003702874449039.

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A dual inductively copuled plasma atomic emission spectroscopic system is described. This new analytical discharge segregates the normally integrated processes of sampling and spectral excitation associated with atomic emission sources. A low-power, low-argon-flow, radio-frequency plasma is used as a sampling device to create gaseous species from liquid and solid samples which are subsequently transported to a second plasma for excitation. Design and construction of instrumentation and associated operational parameters are reviewed. Comparisons of the sampling and the excitation plasmas include spatial emission profiles, linear calibration plots, signal-to-background ratios, and analytical detection limits. Use of the dual ICP for direct analysis of particulates (coal fly ash and firebrick) is demonstrated.

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Qureshi, T. R., Chris Chatwin et Wei Wang. « Bio-impedance Excitation System : A Comparison of Voltage Source and Current Source Designs ». APCBEE Procedia 7 (2013) : 42–47. http://dx.doi.org/10.1016/j.apcbee.2013.08.010.

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Li, Yan Zhou, Gan Wei Cai, Wei Wang, Cai Gui Huang et Chang Jian Luo. « Study on Dynamic Characteristics of the YC6108-G Hypocycloid Internal Combustion Engine Crankshaft Based on ADAMS ». Advanced Materials Research 703 (juin 2013) : 195–99. http://dx.doi.org/10.4028/www.scientific.net/amr.703.195.

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Damping and denoising of diesel engine is on the premise that we acquire the accurate excitation source information, and the main bearing force is major excitation source of diesel engine body vibration. When crankshaft rotating, elements of the diesel engine colliding each other, which resulted in slight deformation of the element and complicated applied force one another. It is difficult to meet the needs of calculation accuracy in structural dynamics analysis method of classical mechanics and trail analysis method is infeasible, so many-body dynamics method was put forward, the method could increase efficiently calculation accuracy, and the diesel engine excitation source of vibration and noise could be accurate predicted.

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Abolmasov, P. K., S. N. Fabrika et O. N. Sholukhova. « The optical counterpart of the ultraluminous X-ray source NGC6946 ULX-1 ». Proceedings of the International Astronomical Union 2, S238 (août 2006) : 229–32. http://dx.doi.org/10.1017/s1743921307005029.

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AbstractWe present a study of a peculiar nebula MF16 associated with an Ultraluminous X-ray Source NGC6946 ULX-1. We use integral-field and long-slit spectral data obtained with the 6-m telescope (Russia). The nebula was for a long time considered powered by strong shocks enhancing both high-excitation and low-excitation lines. However, kinematical properties point to rather moderate expansion rates (VS ∼ 100÷200 km s−1). The total power of the emission-line source exceeds by one or two orders of magnitude the power observed expansion rate can provide, that points towards the existence of an additional source of excitation and ionization. Using CLOUDY96.01 photoionization code we derive the properties of the photoionizing source. Its total UV/EUV luminosity must be about 1040 erg/s.

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Holtz, Janet S. W., Richard W. Bormett, Zhenhuan Chi, Namjun Cho, X. G. Chen, Vasil Pajcini, Sanford A. Asher, Luis Spinelli, Philip Owen et Marco Arrigoni. « Applications of a New 206.5-nm Continuous-Wave Laser Source : UV Raman Determination of Protein Secondary Structure and CVD Diamond Material Properties ». Applied Spectroscopy 50, n^o 11 (novembre 1996) : 1459–68. http://dx.doi.org/10.1366/0003702963904683.

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We demonstrate the utility of a new 206.5-nm continuous-wave UV laser excitation source for spectroscopic studies of proteins and CVD diamond. Excitation at 206.5 nm is obtained by intracavity frequency doubling the 413-nm line of a krypton-ion laser. We use this excitation to excite resonance Raman spectra within the π → π amide transition of the protein peptide backbone. The 206.5-nm excitation resonance enhances the protein amide vibrational modes. We use these high signal-to-noise spectral data to determine protein secondary structure. We also demonstrate the utility of this source to excite CVD and gem-quality diamond within its electronic bandgap. The diamond Raman spectra have very high signal-to-noise ratios and show no interfering broad-band luminescence. Excitation within the diamond bandgap also gives rise to narrow photoluminescence peaks from diamond defects. These features have previously been observed only by cathodoluminescence measurements. This new continuous-wave UV source is superior to the previous pulsed sources, because it avoids nonlinear optical phenomena and thermal sample damage; Photoluminescence.

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Dong, Jian Chao, Tie Jun Yang, Xin Hui Li, Zhi Jun Shuai et You Hong Xiao. « Identification of Excitation Source Number Using Principal Component Analysis ». Advanced Materials Research 199-200 (février 2011) : 850–57. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.850.

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Principal component analysis (PCA), serving as one of the basic blind signal processing techniques, is extensively employed in all forms of analysis for extracting relevant information from confusing data sets. The principle of PCA is explained in this paper firstly, then the simulation and experiment are carried out to a simply supported beam rig, and PCA is used in frequency domain to identify sources number of several cases. Meanwhile principal components (PCs) contribution coefficient and signal to noise ratio between neighboring PCs (neighboring SNR) are introduced to cutoff minor components quantificationally. The results show that when observation number is equal to or larger than source number and additive noise is feebleness, accurate prediction of the number of uncorrelated excitation sources in a multiple input multiple output system could be obtained by principal component analysis.

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Li, Bo, Chunyan Wu, Mengran Wang, Kriti Charan et Chris Xu. « An adaptive excitation source for high-speed multiphoton microscopy ». Nature Methods 17, n^o 2 (2 décembre 2019) : 163–66. http://dx.doi.org/10.1038/s41592-019-0663-9.

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Ziada, S., E. T. Bühlmann et U. Bolleter. « Flow impingement as an excitation source in control valves ». Journal of Fluids and Structures 3, n^o 5 (septembre 1989) : 529–49. http://dx.doi.org/10.1016/s0889-9746(89)80029-5.

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Nandi, Dipanjan, Debadatta Pati et K. Sreenivasa Rao. « Parametric representation of excitation source information for language identification ». Computer Speech & ; Language 41 (janvier 2017) : 88–115. http://dx.doi.org/10.1016/j.csl.2016.05.001.

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Olofsson, Linnea, et Emmanuel Margeat. « Pulsed interleaved excitation fluorescence spectroscopy with a supercontinuum source ». Optics Express 21, n^o 3 (4 février 2013) : 3370. http://dx.doi.org/10.1364/oe.21.003370.

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Kawahara, Hideki. « Excitation source structural analysis of Japanese traditional singing voices ». Journal of the Acoustical Society of America 131, n^o 4 (avril 2012) : 3377. http://dx.doi.org/10.1121/1.4708733.

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Koolagudi, Shashidhar G., Swati Devliyal, Bhavna Chawla, Anurag Barthwal et K. Sreenivasa Rao. « Recognition of Emotions from Speech using Excitation Source Features ». Procedia Engineering 38 (2012) : 3409–17. http://dx.doi.org/10.1016/j.proeng.2012.06.394.

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Yuan, Hongyan, Martin M. F. Choi, Wing Hong Chan, Leiji Zhou et Kemin Wang. « Dual-light source excitation for mode-filtered light detection ». Analytica Chimica Acta 481, n^o 2 (avril 2003) : 301–10. http://dx.doi.org/10.1016/s0003-2670(03)00088-6.

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Kanamori, Hiroo. « Excitation of Jovian normal modes by an impact source ». Geophysical Research Letters 20, n^o 24 (23 décembre 1993) : 2921–24. http://dx.doi.org/10.1029/93gl03187.

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Ohishi, Masatoshi, Norio Kaifu, Hiroko Suzuki et Masaki Morimoto. « Excitation of interstellar molecules in the Ori-KL source ». Astrophysics and Space Science 118, n^o 1-2 (janvier 1986) : 405–7. http://dx.doi.org/10.1007/bf00651157.

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