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Статті в журналах з теми "Point source analysis"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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1

Qichang An, Qichang An, Jingxu Zhang Jingxu Zhang, Fei Yang Fei Yang, and Hongchao Zhao Hongchao Zhao. "Normalized point source sensitivity analysis in GSSM prototype." Chinese Optics Letters 15, no. 11 (2017): 111202. http://dx.doi.org/10.3788/col201715.111202.

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2

BELLENI-MORANTE, A., W. LAMB, and A. C. McBRIDE. "PHOTON TRANSPORT PROBLEMS INVOLVING A POINT SOURCE." Analysis and Applications 05, no. 01 (January 2007): 77–93. http://dx.doi.org/10.1142/s0219530507000894.

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We consider both a direct and an inverse problem of photon transport in an interstellar cloud with a point photon source. By using a non-rigorous (but physically reasonable) procedure, we prove that the direct problem has a unique solution and that the inverse problem also has a unique solution, under the assumptions that a single value of the photon far-field is known and the scattering cross-section is suitably small. Finally, we show in a rigorous way that the direct problem has a unique distributional solution if the point source is modelled by a Dirac δ functional.

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3

Bellenghi, C., T. Glauch, C. Haack, T. Kontrimas, H. Niederhausen, R. Reimann, and M. Wolf. "A new and improved IceCube point source analysis." Journal of Instrumentation 16, no. 11 (November 1, 2021): C11002. http://dx.doi.org/10.1088/1748-0221/16/11/c11002.

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Abstract The IceCube Neutrino Observatory, a cubic kilometer scale Cherenkov detector deployed in the deep ice at the geographic South Pole, investigates extreme astrophysical phenomena by studying the corresponding high-energy neutrino signal. Its discovery of a diffuse flux of astrophysical neutrinos with energies up to the PeV scale in 2013 has triggered a vast effort to identify the mostly unknown sources of these high energy neutrinos. Here, we present a new IceCube point-source search that improves the accuracy of the statistical analysis, especially at energies of a few TeV and below. The new approach is based on multidimensional kernel density estimation for the probability density functions and new estimators for the observables, namely the reconstructed energy and the estimated angular uncertainty on the reconstructed arrival direction. The more accurate analysis provides an improvement in discovery potential up to ∼30% over previous works for hard spectrum sources.

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4

Miller, E. K. "Time-Domain Far-Field Analysis of Radiation Sources and Point-Source Coherence." IEEE Antennas and Propagation Magazine 54, no. 2 (April 2012): 100–108. http://dx.doi.org/10.1109/map.2012.6230721.

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5

Chung, Jaywan, Yong-Jung Kim, and Marshall Slemrod. "An explicit solution of Burgers equation with stationary point source." Journal of Differential Equations 257, no. 7 (October 2014): 2520–42. http://dx.doi.org/10.1016/j.jde.2014.05.046.

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6

Dubath, P., J. Knödlseder, G. K. Skinner, P. Connell, I. Kreykenbohm, A. Strong, P. Sizun, et al. "TheINTEGRALspectrometer SPI: performance of point-source data analysis." Monthly Notices of the Royal Astronomical Society 357, no. 2 (February 2005): 420–28. http://dx.doi.org/10.1111/j.1365-2966.2005.08675.x.

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7

Hu, Yaozhong, and Guanglin Rang. "Identification of the Point Sources in Some Stochastic Wave Equations." Abstract and Applied Analysis 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/219876.

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Анотація:

We introduce and study a type of (one-dimensional) wave equations with noisy point sources. We first study the existence and uniqueness problem of the equations. Then, we assume that the locations of point sources are unknown but we can observe the solution at some other location continuously in time. We propose an estimator to identify the point source locations and prove the convergence of our estimator.

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8

Cekirge, H. "Auxiliary source point method: the Laplace equation." Engineering Analysis with Boundary Elements 4, no. 4 (December 1987): 186–89. http://dx.doi.org/10.1016/0955-7997(87)90040-3.

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9

Benamou, Jean-David, Guillaume Chazareix, Wilbert IJzerman, and Giorgi Rukhaia. "Point source regularization of the finite source reflector problem." Journal of Computational Physics 456 (May 2022): 111032. http://dx.doi.org/10.1016/j.jcp.2022.111032.

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10

AN Qi-chang, 安其昌, 张景旭 ZHANG Jing-xu, 杨. 飞. YANG Fei, 赵宏超 ZHAO Hong-chao, and 曹海峰 CAO Hai-feng. "Normalized point source sensitivity analysis of large sparse telescopes." Chinese Optics 12, no. 3 (2019): 567–74. http://dx.doi.org/10.3788/co.20191203.0567.

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11

Buhler, Joe P. "Acoustic analysis of bone using point-source-like transducers." Journal of the Acoustical Society of America 112, no. 5 (2002): 1742. http://dx.doi.org/10.1121/1.1526587.

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12

Leathers, Robert A., T. Valerie Downes, and Curtiss O. Davis. "Analysis of a point-source integrating-cavity absorption meter." Applied Optics 39, no. 33 (November 20, 2000): 6118. http://dx.doi.org/10.1364/ao.39.006118.

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13

Sun, Chengyu, Xingyao Yin, and Yunfei Xiao. "Simulation and analysis of point-source surface wave fields." Earthquake Science 24, no. 5 (October 2011): 419–26. http://dx.doi.org/10.1007/s11589-011-0804-4.

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14

Kardos, Josef S., and Christopher C. Obropta. "Water Quality Model Uncertainty Analysis of a Point-Point Source Phosphorus Trading Program1." JAWRA Journal of the American Water Resources Association 47, no. 6 (August 22, 2011): 1317–37. http://dx.doi.org/10.1111/j.1752-1688.2011.00591.x.

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15

Yang, Liya, Hao Zhou, and Liyuan Dai. "Investigation and Water quality Analysis of Agricultural nonpoint Source pollution in Tanxia Town." E3S Web of Conferences 329 (2021): 01027. http://dx.doi.org/10.1051/e3sconf/202132901027.

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Анотація:

Taking the small watershed in Tanxia town as an example, the classified investigation of agricultural non-point source pollution in the tributaries of Lijiang River was carried out, the sources of local agricultural non-point source pollution were analyzed, and the surface water environmental quality standard and Nemero index method were used to evaluate the water quality of the basin. The results show that the water quality of the basin is poor and the pollution exceeds the standard all the year round, and the source of agricultural non-point source pollution mainly depends on the pollution of agricultural chemical fertilizer. Improving the use of local chemical fertilizer and rational application of chemical fertilizer are the key factors to improve local agricultural non-point source pollution.

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16

Takahashi, Shuji. "An Existence Theorem for the Point Source Blast Wave Equation." Communications in Partial Differential Equations 34, no. 1 (March 5, 2009): 1–23. http://dx.doi.org/10.1080/03605300802683638.

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17

BELLENI-MORANTE, A., W. LAMB, and A. C. MCBRIDE. "A PHOTON TRANSPORT PROBLEM WITH A TIME-DEPENDENT POINT SOURCE." Analysis and Applications 07, no. 01 (January 2009): 1–19. http://dx.doi.org/10.1142/s021953050900127x.

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Анотація:

We consider a time-dependent problem of photon transport in an interstellar cloud with a point photon source modeled by a Dirac δ functional. The existence of a unique distributional solution to this problem is established by using the theory of continuous semigroups of operators on locally convex spaces coupled with a constructive approach for producing spaces of generalized functions.

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18

Yang, Qing, Sheng Nan Sun, Zheng Hai Jiang, Li Xian Ying, and Zhe Jun Liu. "Agricultural Nonpoint Source Pollution Model Analysis and Application." Applied Mechanics and Materials 178-181 (May 2012): 926–29. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.926.

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Анотація:

With the point source pollution was effectively treated, non-point source pollution, especially the agricultural non-point source pollution (ANPSP), is becoming the main problem in environment. The research is focused on the model analysis and application, which could be scientifically distinguish and effectually control ANPSP. Four kinds of models were introduced here with the development of non-point source pollution, as experience statistical model, mechanism model, function model, improved model by 3S technology and the uncertain analyze. Among these models, HSPF and SWAT model were successfully applied in best management practices (BMP) for ANPSP control. In the future, our country should base on the introduction of the foreign mature techniques, which combine the 3S technology and the uncertain improved model, then enhance the autonomous model research and build the basic database.

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19

Yeh, Hund-Der, and Gour-Tsyh Yeh. "Analysis of Point-Source and Boundary-Source Solutions of One-Dimensional Groundwater Transport Equation." Journal of Environmental Engineering 133, no. 11 (November 2007): 1032–41. http://dx.doi.org/10.1061/(asce)0733-9372(2007)133:11(1032).

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20

Koo, Young Min, Young Do Kim, and Jae Hyeon Park. "Analysis of Non-point Pollution Source Reduction by Permeable Pavement." Journal of Korea Water Resources Association 47, no. 1 (January 31, 2014): 49–62. http://dx.doi.org/10.3741/jkwra.2014.47.1.49.

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21

Li Zhao-Hui, Zhao Jian-Ke, Xu Liang, Liu Feng, Guo Yi, Liu Kai, and Zhao Qing. "Analysis and calibration of precision for point source transmittance system." Acta Physica Sinica 65, no. 11 (2016): 114206. http://dx.doi.org/10.7498/aps.65.114206.

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22

Narayanan, Vijay K., David H. Weinberg, E. Branchini, C. S. Frenk, S. Maddox, S. Oliver, M. Rowan‐Robinson, and W. Saunders. "Reconstruction Analysis of the IRAS Point Source Catalog Redshift Survey." Astrophysical Journal Supplement Series 136, no. 1 (September 2001): 1–24. http://dx.doi.org/10.1086/321789.

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23

Kotov, I. V., S. Hall, D. Gopinath, A. Barbour, J. Li, Y. Gu, K. Holland, et al. "Analysis of the EMCCD point-source response using x-rays." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 985 (January 2021): 164706. http://dx.doi.org/10.1016/j.nima.2020.164706.

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24

Braun, Jim, Jon Dumm, Francesco De Palma, Chad Finley, Albrecht Karle, and Teresa Montaruli. "Methods for point source analysis in high energy neutrino telescopes." Astroparticle Physics 29, no. 4 (May 2008): 299–305. http://dx.doi.org/10.1016/j.astropartphys.2008.02.007.

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25

Kasibhatla, Prasad S., and Leonard K. Peters. "Numerical simulation of transport from a point source: error analysis." Atmospheric Environment. Part A. General Topics 24, no. 3 (January 1990): 693–702. http://dx.doi.org/10.1016/0960-1686(90)90023-g.

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26

Sherman, Arthur, Gregory D. Smith, Longxiang Dai, and Robert M. Miura. "Asymptotic Analysis of Buffered Calcium Diffusion near a Point Source." SIAM Journal on Applied Mathematics 61, no. 5 (January 2001): 1816–38. http://dx.doi.org/10.1137/s0036139900368996.

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27

Beiki, Majid, and Laust B. Pedersen. "Eigenvector analysis of gravity gradient tensor to locate geologic bodies." GEOPHYSICS 75, no. 6 (November 2010): I37—I49. http://dx.doi.org/10.1190/1.3484098.

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Анотація:

We have developed a new method to locate geologic bodies using the gravity gradient tensor. The eigenvectors of the symmetric gravity gradient tensor can be used to estimate the position of the source body as well as its strike direction. For a given measurement point, the eigenvector corresponding to the maximum eigenvalue points approximately toward the center of mass of the causative body. For a collection of measurement points, a robust least-squares procedure is used to estimate the source point as the point that has the smallest sum of square distances to the lines defined by the eigenvectors and the measurement positions. It’s assumed that the maximum of the first vertical derivative of the vertical component of gravity vector [Formula: see text] is approximately located above the center of mass. Observation points enclosed in a square window centered at the maximum of [Formula: see text] are used to estimate the source location. By increasing the size of the window, the number of eigenvectors used in the robust least squares and subsequently the number of solutions increase. As a criterion for selecting the best solution from a set of previously computed solutions, we chose that solution having the minimum relative error (less than a given threshold) of its depth estimate. The strike direction of the source can be estimated from the direction of the eigenvectors corresponding to the smallest eigenvalue for quasi 2D structures. To study the effect of additive random noise and interfering sources, the method was tested on synthetic data sets, and it appears that our method is robust to random noise in the different measurement channels. The method was also tested on gravity gradient tensor data from the Vredefort impact structure, South Africa. The results show a very good agreement with the available geologic information.

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28

Park, Donghee, Seok Goo Song, and Junkee Rhie. "Sensitivity analysis of near-source ground motions to pseudo-dynamic source models derived with 1-point and 2-point statistics of earthquake source parameters." Journal of Seismology 24, no. 2 (January 30, 2020): 397–422. http://dx.doi.org/10.1007/s10950-020-09905-8.

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29

Musayev, Janat, and Algazy Zhauyt. "Analysis of Disturbing Influence of Traffic Load on Soil Body." Advances in Materials Science and Engineering 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/318289.

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Stress waves propagate in soil in case of earthquake and man-made effects (traffic flow, buried explosions, shield-driven pipes and tunnels, etc.). The wave point-sources are those located at the distances equal to more than two waves lengths, which significantly simplifies solving of a problem of these waves’ strength evaluation. Distribution of stress and displacement by the stress waves propagation in elastic medium is a complex pattern. The stress distribution in propagating waves depends on the type and form of source, conditions of the source contact with medium, and properties of mediums in the vicinity of the source. The point-sources and their combinations are selected in such a way to model an influence of machines and processes on soil body in case of shield-driven pipes (tunnels).

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30

Rangel, R. H., and W. A. Sirignano. "AN EVALUATION OF THE POINT-SOURCE APPROXIMATION IN SPRAY CALCULATIONS." Numerical Heat Transfer, Part A: Applications 16, no. 1 (July 1989): 37–57. http://dx.doi.org/10.1080/10407788908944705.

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31

Li, Qiutong, Denis Duhamel, Honore Yin, and Yanyun Luo. "Comparative Analysis of Different Types of Sources on the Performance of Rigid Noise Barriers on Rigid Ground Using Analytical Formulae, a 2.5-D BEM Method and Scale Modelling Tests." Acta Acustica united with Acustica 105, no. 6 (November 1, 2019): 987–99. http://dx.doi.org/10.3813/aaa.919379.

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With the aim of a perfect source model to simulate railway traffic noise within a shorter computational time, this paper compares coherent line, incoherent point and incoherent line sources on the performance of barriers by using an analytical solution, a 2.5-D BEM method and scale modelling tests. The comparison between the analytical solutions and the 2.5-D BEM prediction results shows that the BEM calculations for a coherent line source can be used to approximately show the barrier attenuation spectrum for a one-point source and the single-number rating for an incoherent line source when the barrier is straight on the ground. Then, validations with scale modelling tests were performed outdoors under controlled conditions. The results obtained by using several loudspeakers radiating incoherent sounds simultaneously show good agreement with the 2.5-D BEM prediction results for the one-point source and incoherent point sources, not only for a simple barrier on the ground but also for a double-straight barrier on a viaduct. Based on these agreements, the frequency and longitudinal distance dependences on the barrier attenuation for incoherent point sources are discussed to understand the barrier attenuation spectrum for the incoherent line source.

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32

Geng, Shanshan, Zhenmin Liu, and Xiaoxiao Shi. "Introduction to Marine Data Source Analysis and Sharing." E3S Web of Conferences 358 (2022): 01046. http://dx.doi.org/10.1051/e3sconf/202235801046.

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Анотація:

You should leave 8 mm of space above the abstract and 10 mm after the abstract. The heading Abstract should be typed in bold 9-point Times. The body of the abstract should be typed in normal 9-point Arial in a single paragraph, immediately following the heading. The text should be set to 1 line spacing. The abstract should be centred across the page, indented 17 mm from the left and right page margins and justified. It should not normally exceed 200 words.

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33

Ogasawara, Satoshi, Tadashi Sawada, and Hirofumi Akagi. "Analysis of the Neutral Point Potential Variation of Neutral-Point-Clamped Voltage Source PWM Inverters." IEEJ Transactions on Industry Applications 113, no. 1 (1993): 41–48. http://dx.doi.org/10.1541/ieejias.113.41.

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34

Audounet, Jacques, Jean-Michel Roquejoffre, and Hélène Rouzaud. "Numerical simulation of a point-source initiated flame ball with heat losses." ESAIM: Mathematical Modelling and Numerical Analysis 36, no. 2 (March 2002): 273–91. http://dx.doi.org/10.1051/m2an:2002017.

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35

Jeong, Ju-won, Jae hyuk Lim, Kyung-won Kim, and Jung-ju Lee. "Development of a Point Pyroshock Source Simulator." Shock and Vibration 2017 (2017): 1–16. http://dx.doi.org/10.1155/2017/6834601.

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Анотація:

We developed a point pyroshock source simulator (PPSS) for the study on the source isolation approach (SIA) in this study. In spite of the potentiality of the SIA for avionics protection against pyroshock, it has rarely been investigated due to lack of pyroshock source simulators. To overcome such a situation, we proposed the PPSS using a mechanically excited tuned resonator simulating a release device itself. The PPSS was designed using explicit finite element analysis and Seigel’s gas gun model. To verify the proposed PPSS, the prototype was fabricated and tested. From the results, we have shown that the prototype of the PPSS simulates a near-field pyroshock and is able to evaluate the SIA.

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36

Ayub, M., A. B. Mann, and M. Ahmad. "Line source and point source scattering of acoustic waves by the junction of transmissive and soft–hard half planes." Journal of Mathematical Analysis and Applications 346, no. 1 (October 2008): 280–95. http://dx.doi.org/10.1016/j.jmaa.2008.04.069.

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37

Walsh, J. R., and L. B. Lucy. "Extracting Point Source Spectra / Recovering Extended Object Spectra Using Richardson-Lucy Restoration." Symposium - International Astronomical Union 209 (2003): 412. http://dx.doi.org/10.1017/s0074180900209236.

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Анотація:

Long slit spectra of astronomical objects either contain point sources, characterized by a known Point Spread Function (PSF), which is often wavelength dependent, and extended sources, such as nebulae, whose spatial extent is not a priori known. The analysis of long slit spectra consists in separating the spectrum into either: the point source(s), free of the background (“extraction”); or the extended source(s), free of contaminating point source spectra. Depending on the scientific aim, one or both of these data are of interest, such as the spectrum of the central star of a planetary nebula AND the line and continuum spectrum of the nebula with the star removed. In the simple case of a point source with a background gradient, the spectrum of the point source can be simply extracted by subtracting a background fit by a low order function and summing (perhaps with weights, as in optimal extraction) the point source signal at each spectral element in the cross-dispersion direction. When the background is complex or there are many point sources, there is no guide as to how to fit the extended source spectrum beneath the point sources. Simple methods can give a poor estimate of the spectra of point sources and the spectrum of the background in the vicinity of the stars. The application of image restoration algorithms to the spatial component of long slit spectra offers a potential solution.

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38

Su, Jing, Yanhua Qiu, Yuling Lu, Xiaosong Yang, and Songyan Li. "Use of Multivariate Statistical Techniques to Study Spatial Variability and Sources Apportionment of Pollution in Rivers Flowing into the Laizhou Bay in Dongying District." Water 13, no. 6 (March 12, 2021): 772. http://dx.doi.org/10.3390/w13060772.

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Анотація:

Spatial variability and source apportionment of river pollution flowing into the Bohai Sea are of great significance to the pollution liability and development of control strategies to reduce the terrestrial discharge of pollution in the ocean. In this study, ten water quality variables from 14 monitoring sites in rivers flowing into Laizhou Bay were obtained to investigate the spatial variation and pollution sources in Dongying District from 2018–2019. The survey area was divided into a low pollution (LP) zone and a high pollution (HP) zone by cluster analysis based on ten indicators. Principle component analysis/factor analysis with a geographic information system was performed to identify the four main pollution sources in the survey area. Compared with the positive matrix factorization model, the absolute principal component score-multiple linear regression (APCS-MLR) model was more appropriate for the source apportionment of pollution in the surface water of Dongying District. The point source pollution of domestic sewage (23.6%) was the most crucial pollution source of water in the LP zone, followed by non-point pollution from agricultural activity (16.4%). The contribution rate in the HP zone analyzed by the APCS-MLR model followed a decreasing order: point source pollution from domestic sewage (28.5%) > non-point pollution source of overland runoff (14.8%) > point source pollution of hybrid wastewater (12.4%) > point source pollution from industries sewage (10.6%). Therefore, the spatial distribution and sources of pollution in the investigated area should be considered while developing control measures to reduce the discharge of pollution to Laizhou Bay.

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39

Khachatryan, H. G., A. L. Kashin, E. Poghosyan, and G. Yegoryan. "On the detection of point sources in Planck LFI 70 GHz CMB maps based on cleaned K-map." Modern Physics Letters A 30, no. 14 (April 21, 2015): 1550083. http://dx.doi.org/10.1142/s0217732315500832.

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Анотація:

We use the Planck LFI 70 GHz data to further probe point source detection technique in the sky maps of the cosmic microwave background (CMB) radiation. The method developed by Tegmark et al. for foreground reduced maps and the Kolmogorov parameter as the descriptor are adopted for the analysis of Planck satellite CMB temperature data. Most of the detected points coincide with point sources already revealed by other methods. However, we have also found nine source candidates for which still no counterparts are known.

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40

Bonavera, L., S. L. Suarez Gomez, J. González-Nuevo, M. M. Cueli, J. D. Santos, M. L. Sanchez, R. Muñiz, and F. J. de Cos. "Point source detection with fully convolutional networks." Astronomy & Astrophysics 648 (April 2021): A50. http://dx.doi.org/10.1051/0004-6361/201937171.

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Context. Point sources are one of the main contaminants to the recovery of the cosmic microwave background signal at small scales, and their careful detection will be important for the next generation of cosmic microwave background experiments like LiteBird. Aims. We want to develop a method based on fully convolutional networks to detect sources in realistic simulations, and to compare its performance against one of the most used point source detection method in this context, the Mexican hat wavelet 2 (MHW2). The frequencies for our analysis are the 143, 217, and 353 GHz Planck channels. Methods. We produce realistic simulations of point sources at each frequency taking into account potential contaminating signals as the cosmic microwave background, the cosmic infrared background, the Galactic thermal emission, the thermal Sunyaev-Zel’dovich effect, and the instrumental and point source shot noises. We first produce a set of training simulations at 217 GHz to train the neural network that we named PoSeIDoN. Then we apply both PoSeIDoN and the MHW2 to recover the point sources in the validating simulations at all the frequencies, comparing the results by estimating the reliability, completeness, and flux density estimation accuracy. Moreover, the receiver operating characteristic (ROC) curves are computed in order to asses the methods’performance. Results. In the extra-galactic region with a 30° galactic cut, the neural network successfully recovers point sources at 90% completeness corresponding to 253, 126, and 250 mJy for 143, 217, and 353 GHz respectively. In the same validation simulations the wavelet with a 3σ flux density detection limit recovers point sources up to 181, 102, and 153 mJy at 90% completeness. To reduce the number of spurious sources, we also apply a safer 4σ flux density detection limit, the same as in the Planck catalogues, increasing the 90% completeness levels: 235, 137, and 192 mJy. In all cases PoSeIDoN produces a much lower number of spurious sources with respect to MHW2. As expected, the results on spurious sources for both techniques worsen when reducing the galactic cut to 10°. Conclusions. Our results suggest that using neural networks is a very promising approach for detecting point sources using data from cosmic microwave background experiments, providing overall better results in dealing with spurious sources with respect to the more usual filtering approaches. Moreover, PoSeIDoN gives competitive results even at the 217 GHz nearby channels where the network was not trained.

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41

HwangBo, Hyun, Dong-Il Kim, Young-Sam Yoon, and Kun-Yeun Han. "Non-point Source Quantification Analysis Using SWAT in Nakdong River Watershed." Journal of Korea Water Resources Association 43, no. 4 (April 30, 2010): 367–81. http://dx.doi.org/10.3741/jkwra.2010.43.4.367.

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42

Chen, Li Tao, Jian Chen, Bing Rong Zhang, and Wu Zhang. "Acoustic Sensitivity Analysis Using the Distributed Source Energy Boundary Point Method." Applied Mechanics and Materials 130-134 (October 2011): 76–79. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.76.

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The determination of the sensitivity of the acoustical characteristics of vibrating systems with respect to the variation of the design parameters can provide a method to low-noise design of mechanical structure objectively and quantitatively. Using the Distributed source energy boundary point method, the expressions of the change of the acoustical energy density with respect to design variable is presented in this paper. The Distributed source energy boundary point method is a speedy and precise method which can avoid the complex computing of the singularity integral in EBEM. The correctness and availability is validated by the numerical simulation.

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43

Malik, Jabir Shabbir. "Performance Analysis of Static Precise Point Positioning Using Open-Source GAMP." Artificial Satellites 55, no. 2 (June 1, 2020): 41–60. http://dx.doi.org/10.2478/arsa-2020-0004.

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AbstractIn addition to Global Positioning System (GPS) constellation, the number of Global Navigation Satellite System (GLONASS) satellites is increasing; it is now possible to evaluate and analyze the position accuracy with both the GPS and GLONASS constellation. In this article, statistical analysis of static precise point positioning (PPP) using GPS-only, GLONASS-only, and combined GPS/GLONASS modes is evaluated. Observational data of 10 whole days from 10 International GNSS Service (IGS) stations are used for analysis. Position accuracy in east, north, up components, and carrier phase/code residuals is analyzed. Multi-GNSS PPP open-source package is used for the PPP performance analysis. The analysis also provides the GNSS researchers the understanding of the observational data processing algorithm. Calculation statistics reveal that standard deviation (STD) of horizontal component is 3.83, 13.80, and 3.33 cm for GPS-only, GLONASS-only, and combined GPS/GLONASS PPP solutions, respectively. Combined GPS/GLONASS PPP achieves better positioning accuracy in horizontal and three-dimensional (3D) accuracy compared with GPS-only and GLONASS-only PPP solutions. The results of the calculation show that combined GPS/GLONASS PPP improves, on an average, horizontal accuracy by 12.11% and 60.33% and 3D positioning accuracy by 10.39% and 66.78% compared with GPS-only and GLONASS-only solutions, respectively. In addition, the results also demonstrate that GPS-only solutions show an improvement of 54.23% and 62.54% compared with GLONASS-only PPP mode in horizontal and 3D components, respectively. Moreover, residuals of GLONASS ionosphere-free code observations are larger than the GPS code residuals. However, phase residuals of GPS and GLONASS phase observations are of the same magnitude.

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44

Martinez, Alvaro, and Bela Deshpande. "Analysis of point source emissions in the Texas-Mexico border region." International Journal of Environment and Pollution 38, no. 4 (2009): 361. http://dx.doi.org/10.1504/ijep.2009.027269.

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45

Cao, Zhirui, Xianchao Xun, and Yuegang Fu. "Analysis of the impact of air scattering on point source transmittance." Applied Optics 57, no. 23 (August 2, 2018): 6664. http://dx.doi.org/10.1364/ao.57.006664.

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46

Clark, Joseph A. "Enhancing underwater acoustic vector sensor measurement performance by point source analysis." Journal of the Acoustical Society of America 122, no. 5 (2007): 3010. http://dx.doi.org/10.1121/1.2942752.

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47

Garg, A., M. Kapshe, P. R. Shukla, and D. Ghosh. "Large point source (LPS) emissions from India: regional and sectoral analysis." Atmospheric Environment 36, no. 2 (January 2002): 213–24. http://dx.doi.org/10.1016/s1352-2310(01)00439-3.

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48

Diehl, Stefan. "On Scalar Conservation Laws with Point Source and Discontinuous Flux Function." SIAM Journal on Mathematical Analysis 26, no. 6 (November 1995): 1425–51. http://dx.doi.org/10.1137/s0036141093242533.

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49

Li, Muxiao, Ziwei Zhu, Tiesong Deng, and Xiaozhen Sheng. "An investigation into high-speed train interior noise with operational transfer path analysis method." Railway Engineering Science 29, no. 1 (February 26, 2021): 1–14. http://dx.doi.org/10.1007/s40534-021-00235-0.

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AbstractPassengers' demands for riding comfort have been getting higher and higher as the high-speed railway develops. Scientific methods to analyze the interior noise of the high-speed train are needed and the operational transfer path analysis (OTPA) method provides a theoretical basis and guidance for the noise control of the train and overcomes the shortcomings of the traditional method, which has high test efficiency and can be carried out during the working state of the targeted machine. The OTPA model is established from the aspects of "path reference point-target point" and "sound source reference point-target point". As for the mechanism of the noise transmission path, an assumption is made that the direct sound propagation is ignored, and the symmetric sound source and the symmetric path are merged. Using the operational test data and the OTPA method, combined with the results of spherical array sound source identification, the path contribution and sound source contribution of the interior noise are analyzed, respectively, from aspects of the total value and spectrum. The results show that the OTPA conforms to the calculation results of the spherical array sound source identification. At low speed, the contribution of the floor path and the contribution of the bogie sources are dominant. When the speed is greater than 300 km/h, the contribution of the roof path is dominant. Moreover, for the carriage with a pantograph, the lifted pantograph is an obvious source. The noise from the exterior sources of the train transfer into the interior mainly through the form of structural excitation, and the contribution of air excitation is non-significant. Certain analyses of train parts provide guides for the interior noise control.

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50

Cekirge, H. "Auxiliary source point method: the inhomogeneous and nonlinear laplace equation." Engineering Analysis with Boundary Elements 5, no. 1 (March 1988): 49–52. http://dx.doi.org/10.1016/0955-7997(88)90035-5.

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