Relevant bibliographies by topics / Multi-angular

Academic literature on the topic 'Multi-angular'

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Published: 4 June 2021
Last updated: 10 March 2023

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Journal articles on the topic "Multi-angular"

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Liu, Deyang, Yan Huang, Qiang Wu, Ran Ma, and Ping An. "Multi-Angular Epipolar Geometry Based Light Field Angular Reconstruction Network." IEEE Transactions on Computational Imaging 6 (2020): 1507–22. http://dx.doi.org/10.1109/tci.2020.3037413.

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Thylwe, Karl-Erik. "Multi-state complex angular momentum residues." Journal of Physics A: Mathematical and General 39, no. 38 (September 5, 2006): 11895–99. http://dx.doi.org/10.1088/0305-4470/39/38/015.

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Sharma, Ram C. "Vegetation Structure Index (VSI): Retrieving Vegetation Structural Information from Multi-Angular Satellite Remote Sensing." Journal of Imaging 7, no. 5 (May 9, 2021): 84. http://dx.doi.org/10.3390/jimaging7050084.

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Utilization of the Bidirectional Reflectance Distribution Function (BRDF) model parameters obtained from the multi-angular remote sensing is one of the approaches for the retrieval of vegetation structural information. In this research, the potential of multi-angular vegetation indices, formulated by the combination of multi-spectral reflectance from different view angles, for the retrieval of forest above-ground biomass was assessed in the New England region. The multi-angular vegetation indices were generated by the simulation of the Moderate Resolution Imaging Spectroradiometer (MODIS) BRDF/Albedo Model Parameters Product (MCD43A1 Version 6)-based BRDF parameters. The effects of the seasonal (spring, summer, autumn, and winter) composites of the multi-angular vegetation indices on the above-ground biomass, the angular relationship of the spectral reflectance with above-ground biomass, and the interrelationships between the multi-angular vegetation indices were analyzed. Among the existing multi-angular vegetation indices, only the Nadir BRDF-adjusted NDVI and Hot-spot incorporated NDVI showed significant relationship (more than 50%) with the above-ground biomass. The Vegetation Structure Index (VSI), newly proposed in the research, performed in the most efficient way and explained 64% variation of the above-ground biomass, suggesting that the right choice of the spectral channel and observation geometry should be considered for improving the estimates of the above-ground biomass. In addition, the right choice of seasonal data (summer) was found to be important for estimating the forest biomass, while other seasonal data were either insensitive or pointless. The promising results shown by the VSI suggest that it could be an appropriate candidate for monitoring vegetation structure from the multi-angular satellite remote sensing.
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Liu, Zhao Yan, Ling Ling Ma, Ling Li Tang, and Yong Gang Qian. "LAI Retrieval Based on PROSPECT-SAILH Model from Multi-Angular Data of WiDAS Imaging System." Advanced Materials Research 518-523 (May 2012): 5697–703. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.5697.

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The aim of this study is to assess the capability of estimating Leaf Area Index (LAI) from high spatial resolution multi-angular Vis-NIR remote sensing data of WiDAS (Wide-Angle Infrared Dual-mode Line/Area Array Scanner) imaging system by inverting the coupled radiative transfer models PROSPECT-SAILH. Based on simulations from SAILH canopy reflectance model and PROSPECT leaf optical properties model, a Look-up Table (LUT) which describes the relationship between multi-angular canopy reflectance and LAI has been produced. Then the LAI can be retrieved from LUT by directly matching canopy reflectance of six view directions and four spectral bands with LAI. The inversion results are validated by field data, and by comparing the retrieval results of single-angular remote sensing data with multi-angular remote sensing data, we can found that the view angle takes the obvious impact on the LAI retrieval of single-angular data and that high accurate LAI can be obtained from the high resolution multi-angular remote sensing technology.
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Christodoulidis, Perseas, Diederik Roest, and Evangelos I. Sfakianakis. "Angular inflation in multi-field α-attractors." Journal of Cosmology and Astroparticle Physics 2019, no. 11 (November 4, 2019): 002. http://dx.doi.org/10.1088/1475-7516/2019/11/002.

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Mozzhechkov, V. A. "Modular Multi-Turn Gear Angular Position Encoder." Measurement Techniques 62, no. 7 (October 2019): 608–14. http://dx.doi.org/10.1007/s11018-019-01667-1.

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Cheng Tian-Hai, Gu Xing-Fa, Chen Liang-Fu, Yu Tao, and Tian Guo-Liang. "Multi-angular polarized characteristics of cirrus clouds." Acta Physica Sinica 57, no. 8 (2008): 5323. http://dx.doi.org/10.7498/aps.57.5323.

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Seong, Woo-Jae. "Prediction and Characteristics of Angular Distortion in Multi-Layer Butt Welding." Materials 12, no. 9 (May 2, 2019): 1435. http://dx.doi.org/10.3390/ma12091435.

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Multi-layer welding involves the process of stacking many beads, so it requires much time and effort to predict the deformation through experimentation or numerical analysis. In this study, a systematic method for predicting transverse angular distortion in multi-layer butt welding has been proposed. First, the database was established through bead-on-plate welding experiments, which consisted of the relationship between welding conditions, the bead geometry, the material thickness, and the angular distortion. Then, when the arbitrary welding conditions and the shape of the butt joint were input, the method calculated the angular distortion per pass using the geometric principle and the database. The obtained prediction curves were verified with the V-groove welding experimental results. In addition, the characteristics of angular distortion in multi-layer butt welding were discussed. It was found that the angular distortion curve is a function of the number of passes and groove geometry. This algorithm is based on a numerical approach that saves computational time using databases and geometry, so it is suitable for industrial applications.
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Forsström, Petri R., Aarne Hovi, Giulia Ghielmetti, Michael E. Schaepman, and Miina Rautiainen. "Multi-angular reflectance spectra of small single trees." Remote Sensing of Environment 255 (March 2021): 112302. http://dx.doi.org/10.1016/j.rse.2021.112302.

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CHENG, Tian-Hai, Xing-Fa GU, Tao YU, Liang-Fu CHEN, and Guo-Liang TIAN. "MULTIANGULAR POLARIZED RADIATION CHARACTERISTICS OF WATER CLOUDS." JOURNAL OF INFRARED AND MILLIMETER WAVES 28, no. 4 (September 28, 2009): 267–71. http://dx.doi.org/10.3724/sp.j.1010.2009.00267.

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Dissertations / Theses on the topic "Multi-angular"

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Palermo, William J. "Angular rate estimation for multi-body spacecraft attitude control." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA392077.

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Thesis (M.S. in Astronautical Engineering and Aeronautical and Astronautical Engineer) Naval Postgraduate School, June 2001.
Thesis advisor(s): Agrawal, Brij N. "June 2001." Includes bibliographical references (p. 109-110). Also available in print.
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Zhu, Xinghua, and 朱星华. "Multi-compartment model estimation and analysis in high angular resolution diffusion imaging." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/206696.

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Diffusion weighted magnetic resonance images offer unique insights into the neural networks of in vivo human brain. In this study, we investigate estimation and statistical analysis of multi-compartment models in high angular resolution diffusion imaging (HARDI) involving the Rician noise model. In particular, we address four important issues in multi-compartment diffusion model estimation, namely, the modelling of Rician noise in diffusion weighted (DW) images, the automatic determination of the number of compartments in the diffusion signal, the application of spatial prior on multi-compartment models, and the evaluation of parameter indeterminacy in diffusion models. We propose an expectation maximization (EM) algorithm to estimate the parameters of a multi-compartment model by maximizing the Rician likelihood of the diffusion signal. We introduce a novel scheme for automatically selecting the number of compartments, via a sparsity-inducing prior on the compartment weights. A non-local weighted maximum likelihood estimator is proposed to improve estimation accuracy utilizing repetitive patterns in the image. Experimental results show that the proposed algorithm improves estimation accuracy in low signal-to-noise-ratio scenarios, and it provides better model selection than several alternative strategies. In addition, we derive the Cram´er-Rao Lower Bound (CRLB) of the maximum Rician likelihood estimator for the balland-stick model and general differentiable diffusion models. The CRLB provides a general theoretical tool for comparing diffusion models and examining parameter indeterminacy in the maximum likelihood estimation problem.
published_or_final_version
Computer Science
Doctoral
Doctor of Philosophy
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Nag, Sreeja. "Design and evaluation of distributed spacecraft missions for multi-angular Earth observation." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98586.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2015.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 225-238).
Distributed Spacecraft Missions (DSMs) are gaining momentum in their application to Earth science missions owing to their ability to increase observation sampling in spatial, spectral and temporal dimensions. This thesis identifies a gap in the angular sampling abilities of monolithic spacecraft in Earth observation missions and proposes to use distributed spacecraft to address this gap. The science performance metric is chosen to be Bidirectional Reflectance-Distribution Function (BRDF), which describes the directional and spectral variation of reflectance of an optically thick surface element at any time instant. Airborne instruments are the gold standard for BRDF estimation (e.g. Cloud Absorption Radiometer/CAR). They can collect thousands of reflectance measurements at the same ground spot, but are localized in space and time. Spaceborne platforms estimate BRDF by combining angular measurements over time, made along-track, cross-track or by autonomous pointing. However, their plane of data acquisition is very restricted with respect to the sun and the target itself might change over time of acquisition. Formations with spectrometer payloads can make multi-spectral reflectance measurements of a ground target, at many zenith and azimuthal angles simultaneously and estimate the angular signature of the surface. Constellations with overlapping ground spots can capture the angular components of global and temporally varying science products. This work demonstrates the performance impact and feasibility of a BRDF estimation mission using a systems engineering tool (driven by model based systems engineering or MBSE), intricately coupled with a science evaluation tool (driven by observing system simulation experiments or OSSEs). Formations and payload pointing strategies are optimized to maximize angular spread and minimize estimation errors. The effect of angular spread on spatial, spectral and radiometric sampling dimensions is quantified for available spectrometer payloads that fit within the 6U CubeSat standard. Technical feasibility within 6U is verified for attitude determination and control, propulsion, communication and onboard processing modules. DSM architectures are generated and compared to each other and monoliths, in terms of BRDF, albedo, gross primary productivity and total outgoing radiation. Performance is benchmarked with respect to data from previous airborne campaigns (NASA CAR), tower measurements (AMSPEC II) and ideal values from radiative transfer or climate models (UMGLO, COART); and accepted BRDF models. A formation of 6 small satellites produces lesser average error (21.82%) than larger monoliths (23.2%) over extended time periods, purely in terms of angular sampling benefits. The monolithic albedo error of 3.6% is shown to be outperformed by a formation of 3 satellites (1.86%), when arranged optimally and by a formation of 5 satellites (3.36%) when arranged in any way. An 8-satellite formation pushes albedo errors to 0.67% and reduces gross primary productivity errors from 89.77% (monolithic) to 78.69%.
by Sreeja Nag.
Ph. D.
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Liesenberg, Veraldo. "Análise multi-angular de fitofisionomias do bioma cerrado com dados MISR/Terra." Instituto Nacional de Pesquisas Espaciais, 2005. http://urlib.net/sid.inpe.br/iris@1913/2005/08.03.19.56.

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Imagens do sensor Multi-angle Imaging SpectroRadiometer (MISR), que está a bordo do satélite TERRA (EOS-AM1), foram utilizadas para investigar o uso potencial de dados multiangulares para a discriminação de cinco fitofisionomias do Cerrado (Floresta Estacional, Mata Seca, Mata Ciliar, Cerrado stricto sensu e Cerrado Ralo) em quatro datas distintas (novembro de 2003; abril, julho e outubro de 2004). Os dados multiangulares foram obtidos em nove câmeras de 0° (An), ±26,1° (Af, Aa), ±45,6° (Bf, Ba), ±60° (Cf, Ca), ±70,5° (Df, Da), relativas ao nadir, ambos para frente (+) e para trás (-) ao longo da trajetória orbital. Cada câmera fornece dados em quatro bandas espectrais (azul, verde, vermelho e infravermelho próximo). A área de estudo está localizada na porção noroeste do Estado de Minas Gerais. Para caracterizar o comportamento espectro-angular das fitofisionomias nas estações seca e chuvosa, uma Análise por Principais Componentes (APC) foi aplicada sobre 1800 espectros (10 pixels, 5 fitofisionomias, 9 ângulos de visada) em cada data, usando os valores do Fator de Reflectância Bidirecional (BRF) das 4 bandas MISR como variáveis de entrada. Perfis espectro-angulares de BRF e do Normalized Difference Vegetation Index (NDVI) foram analisados para cada fitofisionomia e para cada data. Para fins de classificação das fitofisionomias, o algorítmo da Máxima Verossimilhança (MAXVER) foi utilizado e os resultados de classificação foram comparados com um mapa de referência. Parâmetros dendrométricos destas fitofisionomias, coletados em campo, e dados auxiliares do sensor MISR (índice de área foliar, fração da vegetação fotossintenticamente ativa) foram usados para melhor entender a dinâmica espectro-angular-temporal destas classes de vegetação. Os resultados mostraram que: (a) a transição da região preferencial do espalhamento frontal para a de retroespalhamento foi caracterizada por um deslocamento dos escores da esquerda para a direita do eixo PC1, que representou a reflectância média dos componentes de cena. Isto ocorreu apenas para as imagens adquiridas no plano principal (PP) (abril, julho e outubro de 2004) devido a dominância de componentes iluminados do dossel vistos pelo sensor na direção de retroespalhamento; (b) os perfis das fitofisionomias fortemente afetadas pelos efeitos espectrais da sazonalidade, como a Mata Seca, ocuparam posições distintas ao longo da segunda componente (PC2), que refletiu principalmente variações na reflectância das bandas do infravermelho próximo e do vermelho; (c) para a imagem obtida no plano ortogonal (PO) (novembro de 2003), a resposta espectro-angular das fitofisionomias foi aproximadamente simétrica, em torno do nadir, em função de proporções similares de componentes iluminados e sombreados do dossel vistos pelo sensor. Para as demais imagens obtidas no PP, a resposta espectro-angular foi anisotrópica, especialmente para Cerrado Ralo; (d) o ângulo de visada que produziu o retroespalhamento máximo da radiação variou com o ângulo zenital solar nas imagens adquiridas no PP: abril-julho (câmera Bf ou visada de -45,6o) e outubro (câmera Af ou visada de -26,1o). Para a imagem adquirida no PO (novembro), o retroespalhamento máximo ocorreu ao nadir; (e) o cálculo do NDVI não removeu completamente os efeitos direcionais da vegetação, que foram mais fortes com a diminuição do índice de área foliar na estação chuvosa; (f) os melhores resultados de exatidão de classificação e do índice Kappa foram obtidos com as imagens da estação seca e na região preferencial do retroespalhamento (câmeras f). O ângulo de observação mais favorável para a discriminação das fitofisionomias compreendeu a visada de máximo retroespalhamento da radiação, que variou desde o nadir até a câmera Bf entre as datas analisadas. Estes resultados demonstram o potencial do uso de dados multiangulares para melhorar a discriminação e mapeamento de fitofisionomias do Cerrado com o advento da nova geração de sensores multiangulares.
Images collected by the Multi-angle Imaging SpectroRadiometer (MISR) sensor, onboard the Terra satellite (EOS-AM1), were used to investigate the potential use of multiangular data for the discrimination of five Brazilian savanna physiognomies (Floresta Estacional, Mata Seca, Mata Ciliar, Cerrado stricto sensu and Cerrado Ralo) in four different dates (November, 2003; April, July and October, 2004). The multiangular data were obtained in nine discrete view angles of 0° (An), ±26,1° (Af, Aa), ±45,6° (Bf, Ba), ±60° (Cf, Ca), ±70,5° (Df, Da), relative to nadir, both forward (+) and afterward (-) along the direction of flight. Each camera provides data in four spectral bands (blue, green, red and near-infrared). The study area is located in the northwestern portion of the Minas Gerais State. To characterize the spectral-angular behavior of the physiognomies in the dry and rainy seasons, the principal component analysis (PCA) was applied over 1800 spectra (10 pixels, 5 physiognomies, 9 view angles) in each date, using Bidirectional Reflectance Factor (BRF) values of the 4 MISR bands as an input data. Spectral-angular profiles of BRF and Normalized Difference Vegetation Index (NDVI) were analyzed for each physiognomy and date. For classification purposes, the maximum likelihood (MAXVER) algorithm was used and the classification results were compared with a reference map. Dendrometric parameters collected in field, and auxiliary MISR data (Leaf Area Index and Fraction of Photosynthetically Active Radiation) were used to understand better the spectral-angular-temporal dynamics of the vegetation types. The results showed that: (a) the transition from the forward to the backward scattering direction was characterized by a displacement of the scores from the left to the right side of the PC1 axis, which represented the mean reflectance of the scene components. This trend was observed only for the images acquired in the principal plane (PP) (April, July and October, 2004) due to the dominance of sunlit canopy components viewed by the sensor in the backward direction; (b) profiles of the physiognomies strongly affected by the spectral effects of the seasonallity, such as Mata Seca, were located at distinct positions along the second component (PC2), which was mainly related to variations in reflectance of the near-infrared and red bands; (c) for the image acquired in the orthogonal plane (OP) (November, 2003), the spectral-angular response of the physiognomies was approximately symmetrical to the nadir due to similar proportion of sunlit and shaded canopy components viewed by the sensor. For the remaining PP images, the spectral-angular response was anisotropic, especially for the Cerrado Ralo; (d) the view angle that produced the maximum backscattering varied according to the solar zenithal angle of the images acquired in the PP: April-July (camera Bf or view angle of -45.6o) and October (camera Af or view angle of -26.1o). For the OP image (November, 2003), the maximum backscattering was verified at nadir; (e) the NDVI determination did not remove the directional effects of vegetation, which were stronger with the decrease in the leaf area index values in the rainy season; (f) the best results of classification accuracy and Kappa index were obtained in the dry season and in the backward scattering direction (cameras f). The most favorable view angles for the discrimination of the physiognomies comprised the maximum backscattering viewing, which was observed from nadir to the camera Bf. Results demonstrated the potential use of multiangular data to improve discrimination and mapping of the savanna physiognomies.
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Morato, Rafet Sergio. "Contributions to solve the Multi-group Neutron Transport equation with different Angular Approaches." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/159271.

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[ES] La forma más exacta de conocer el desplazamiento de los neutrones a través de un medio material se consigue resolviendo la Ecuación del Transporte Neutrónico. Tres diferentes aproximaciones de esta ecuación se han investigado en esta tesis: Ecuación del transporte neutrónico resuelta por el método de Ordenadas Discretas, Ecuación de la Difusión y Ecuación de Armónicos Esféricos Simplificados. Para resolver estás ecuaciones se estudian diferentes esquemas del Método de Diferencias Finitas. La solución a estas ecuaciones describe la población de neutrones y las reacciones ocasionadas dentro de un reactor nuclear. A su vez, estas variables están relacionadas con el flujo y la potencia, parámetros fundamentales para el Análisis de Seguridad Nuclear. La tesis introduce la definición de las ecuaciones mencionadas y en particular se detallan para el estado estacionario. Se plantea el Método Modal como solución a los problemas de autovalores definidos por dichas ecuaciones. Primero se desarrollan varios algoritmos para la resolución del estado estacionario de la Ecuación del Transporte de Neutrones con el Método de Ordenadas Discretas para la discretización angular y el Método de Diferencias Finitas para la discretización espacial. Se ha implementado una formulación capaz de resolver el problema de autovalores para cualquier número de grupos energéticos con upscattering y anisotropía. Varias cuadraturas utilizadas por este método en su resolución angular han sido estudiadas e implementadas para cualquier orden de aproximación de Ordenadas Discretas. Además, otra formulación se desarrolla para la solución del problema fuente de la ecuación del transporte neutrónico. A continuación, se lleva a cabo un algoritmo que permite resolver la Ecuación de la Difusión de Neutrones con dos variantes del método de diferencias Finitas, una centrada en celda y otra en vértice o nodo. Se utiliza también el Método Modal calculando cualquier número de autovalores para varios grupos de energía y con upscattering. También se implementan los dos esquemas del Método de Diferencias Finitas anteriormente mencionados en el desarrollo de diferentes algoritmos para resolver las Ecuaciones de Armónicos Esféricos Simplificados. Además, se ha realizado un análisis de diferentes aproximaciones de las condiciones de contorno. Finalmente, se han realizado cálculos de la constante de multiplicación, los modos subcríticos, el flujo neutrónico y la potencia para diferentes tipos de reactores nucleares. Estas variables resultan esenciales en Análisis de Seguridad Nuclear. Además, se han realizado diferentes estudios de sensibilidad de parámetros como tamaño de malla, orden utilizado en cuadraturas o tipo de cuadraturas.
[CA] La forma més exacta de conèixer el desplaçament dels neutrons a través d'un mitjà material s'aconsegueix resolent l'Equació del Transport Neutrònic. Tres diferents aproximacions d'esta equació s'han investigat en aquesta tesi: Equació del Transport Neutrònic resolta pel mètode d'Ordenades Discretes, Equació de la Difusió i Equació d'Ármonics Esfèrics Simplificats. Per a resoldre estes equacions s'estudien diferents esquemes del Mètode de Diferències Finites. La solució a estes equacions descriu la població de neutrons i les reaccions ocasionades dins d'un reactor nuclear. Al seu torn, estes variables estan relacionades amb el flux i la potència, paràmetres fonamentals per a l'Anàlisi de Seguretat Nuclear. La tesi introduïx la definició de les equacions mencionades i en particular es detallen per a l'estat estacionari. Es planteja el Mètode Modal com a solució als problemes d'autovalors definits per les dites equacions. Primer es desenvolupen diversos algoritmes per a la resolució de l'estat estacionari de l'Equació del Transport de Neutrons amb el Mètode d'Ordenades Discretes per a la discretiztació angular i el Mètode de Diferències Finites per a la discretització espacial. S'ha implementat una formulació capaç de resoldre el problema d'autovalors per a qualsevol nombre de grups energètics amb upscattering i anisotropia. Diverses quadratures utilitzades per este mètode en la seua resolució angular han sigut estudiades i implementades per a qualsevol orde d'aproximació d'Ordenades Discretes. A més, una altra formulació es desenvolupa per a la solució del problema font de l'Equació del Transport Neutrònic. A continuació, es du a terme un algoritme que permet resoldre l'Equació de la Difusió de Neutrons amb dos variants del mètode de Diferències Finites, una centrada en cel·la i una altra en vèrtex o node. S'utilitza també el Mètode Modal calculant qualsevol nombre d'autovalors per a diversos grups d'energia i amb upscattering. També s'implementen els dos esquemes del Mètode de Diferències Finites anteriorment mencionats en el desenvolupament de diferents algoritmes per a resoldre les Equacions d'Harmònics Esfèrics Simplificats. A més, s'ha realitzat una anàlisi de diferents aproximacions de les condicions de contorn. Finalment, s'han realitzat càlculs de la constant de multiplicació, els modes subcrítics, el flux neutrònic i la potència per a diferents tipus de reactors nuclears. Estes variables resulten essencials en Anàlisi de Seguretat Nuclear. A més, s'han realitzat diferents estudis de sensibilitat de paràmetres com la grandària de malla, orde utilitzat en quadratures o tipus de quadratures.
[EN] The most accurate way to know the movement of the neutrons through matter is achieved by solving the Neutron Transport Equation. Three different approaches to solve this equation have been investigated in this thesis: Discrete Ordinates Neutron Transport Equation, Neutron Diffusion Equation and Simplified Spherical Harmonics Equations. In order to solve the equations, different schemes of the Finite Differences Method were studied. The solution of these equations describes the population of neutrons and the occurred reactions inside a nuclear system. These variables are related with the flux and power, fundamental parameters for the Nuclear Safety Analysis. The thesis introduces the definition of the mentioned equations. In particular, they are detailed for the steady state case. The Modal Method is proposed as a solution to the eigenvalue problems determined by the equations. First, several algorithms for the solution of the steady state of the Neutron Transport Equation with the Discrete Ordinates Method for the angular discretization and Finite Difference Method for spatial discretization are developed. A formulation able to solve eigenvalue problems for any number of energy groups, with scattering and anisotropy has been developed. Several quadratures used by this method for the angular discretization have been studied and implemented for any order of approach of the discrete ordinates. Furthermore, an adapted formulation has been developed as a solution of the source problem for the Neutron Transport Equation. Next, an algorithm is carried out that allows to solve the Neutron Diffusion Equation with two variants of the Finite Difference Method, one with cell centered scheme and another edge entered. The Modal method is also used for calculating any number of eigenvalues for several energy groups and upscattering. Both Finite Difference schemes mentioned before are also implemented to solve the Simplified Spherical Harmonics Equations. Moreover, an analysis of different approaches of the boundary conditions is performed. Finally, calculations of the multiplication factor, subcritical modes, neutron flux and the power for different nuclear reactors were carried out. These variables result essential in Nuclear Safety Analysis. In addition, several sensitivity studies of parameters like mesh size, quadrature order or quadrature type were performed.
Me gustaría dar las gracias al Ministerio de Economía, Industria y Competitividad y a la Agencia Estatal de Investigación de España por la concesión de mi contrato predoctoral de formación de personal investigador con referencia BES-2016-076782. La ayuda económica proporcionada por este contrato fue esencial para el desarrollo de esta tesis, así como para el financiamiento de una estancia.
Morato Rafet, S. (2020). Contributions to solve the Multi-group Neutron Transport equation with different Angular Approaches [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/159271
TESIS
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Hilker, Thomas. "Estimation of photosynthetic light-use efficience from automated multi-angular spectroradiometer measurements of coastal Douglas-fir." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/2685.

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Global modeling of gross primary production (GPP) is a critical component of climate change research. On local scales, GPP can be assessed from measuring CO₂ exchange above the plant canopy using tower-based eddy covariance (EC) systems. The limited footprint inherent to this method however, restricts observations to relatively few discrete areas making continuous predictions of global CO₂ fluxes difficult. Recently, the advent of high resolution optical remote sensing devices has offered new possibilities to address some of the scaling issues related to GPP using remote sensing. One key component for inferring GPP spectrally is the efficiency (ε) with which plants can use absorbed photosynthetically active radiation to produce biomass. While recent years have seen progress in measuring ε using the photochemical reflectance index (PRI), little is known about the temporal and spatial requirements for up-scaling these findings continuously throughout the landscape. Satellite observations of canopy reflectance are subject to view and illumination effects induced by the bi-directional reflectance distribution function(BRDF) which can confound the desired PRI signal. Further uncertainties include dependencies of PRI on canopy structure, understorey, species composition and leaf pigment concentration. The objective of this research was to investigate the effects of these factors on PRI to facilitate the modeling of GPP in a continuous fashion. Canopy spectra were sampled over a one-year period using an automated tower-based, multi-angular spectroradiometer platform (AMSPEC), designed to sample high spectral resolution data. The wide range of illumination and viewing geometries seen by the instrument permitted comprehensive modeling of the BRDF. Isolation of physiologically induced changes in PRI yielded a high correlation (r²=0.82, p<0.05) to EC-measured ε, thereby demonstrating the capability of PRI to model ε throughout the year. The results were extrapolated to the landscape scale using airborne laser-scanning (light detection and ranging, LiDAR) and high correlations were found between remotely-sensed and EC-measured GPP (r²>0.79, p<0.05). Permanently established tower-based canopy reflectance measurements are helpful for ongoing research aimed at up-scaling ε to landscape and global scales and facilitate a better understanding of physiological cycles of vegetation and serve as a calibration tool for broader band satellite observations.
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7

Sugianto, Biological Earth &amp Environmental Science UNSW. "Multi-angular hyperspectral data and its influences on soil and plant property measurements: spectral mapping and functional data analysis approach." Awarded by:University of New South Wales. Biological, Earth and Environmental Science, 2006. http://handle.unsw.edu.au/1959.4/25531.

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This research investigates the spectral reflectance characteristics of soil and vegetation using multi-angular and single view hyperspectral data. The question of the thesis is ???How much information can be obtained from multi-angular hyperspectral remote sensing in comparison with single view angle hyperspectral remote sensing of soil and vegetation???? This question is addressed by analysing multi-angular and single view angle hyperspectral remote sensing using data from the field, airborne and space borne hyperspectral sensors. Spectral mapping, spectral indices and Functional Data Analysis (FDA) are used to analyse the data. Spectral mapping has been successfully used to distinguish features of soil and cotton with hyperspectral data. Traditionally, spectral mapping is based on collecting endmembers of pure pixels and using these as training areas for supervised classification. There are, however, limitations in the use of these algorithms when applied to multi-angular images, as the reflectance of a single ground unit will differ at each angle. Classifications using six-class endmembers identified using single angle imagery were assessed using multi-angular Compact High Resolution Imaging Spectrometer (CHRIS) imagery, as well as a set of vegetation indices. The results showed no significant difference between the angles. Low nutrient content in the soil produced lower vegetation index values, and more nutrients increased the index values. This research introduces FDA as an image processing tool for multi-angular hyperspectral imagery of soil and cotton, using basis functions for functional principal component analysis (fPCA) and functional linear modelling. FDA has advantages over conventional statistical analysis because it does not assume the errors in the data are independent and uncorrelated. Investigations showed that B-splines with 20-basis functions was the best fit for multi-angular soil spectra collected using the spectroradiometer and the satellite mounted CHRIS. Cotton spectra collected from greenhouse plants using a spectrodiometer needed 30-basis functions to fit the model, while 20-basis functions were sufficient for cotton spectra extracted from CHRIS. Functional principal component analysis (fPCA) of multi-angular soil spectra show the first fPCA explained a minimum of 92.5% of the variance of field soil spectra for different azimuth and zenith angles and 93.2% from CHRIS for the same target. For cotton, more than 93.6% of greenhouse trial and 70.6% from the CHRIS data were explained by the first fPCA. Conventional analysis of multi-angular hyperspectral data showed significant differences exist between soil spectra acquired at different azimuth and zenith angles. Forward scan direction of zenith angle provides higher spectral reflectance than backward direction. However, most multi-angular hyperspectral data analysed as functional data show no significant difference from nadir, except for small parts of the wavelength of cotton spectra using CHRIS. There is also no significant difference for soil spectra analysed as functional data collected from the field, although there was some difference for soil spectra extracted from CHRIS. Overall, the results indicate that multi-angular hyperspectral data provides only a very small amount of additional information when used for conventional analyses.
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Gunduz, Aydin. "Multi-Dimensional Stiffness Characteristics of Double Row Angular Contact Ball Bearings and Their Role in Influencing Vibration Modes." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1326397623.

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Ren, Huazhong. "Modelling of directional thermal radiation and angular correction on land surface temperature from space." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00967047.

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The aim of this thesis is the modeling of surface directional thermal radiation and angular correction on the LST by using empirical and physical methods as well as the analysis of field validation. The work has conducted to some conclusions. The directional emissivity of natural surfaces was obtained from MODIS emissivity product and then used in the split-window algorithm for angular correction on LST. The parameterization models of directional emissivity and thermal radiation were developed. As for the non-isothermal pixels, the daytime-TISI method was proposed to retrieve directional emissivity and effective temperature from multi-angular middle and thermal infrared data. This was validated using an airborne dataset. The kernel-driven BRDF model was checked in the thermal infrared domain and its extension was used to make angular normalization on the LST. A new model, namely FovMod that concerns on the footprint of ground sensor, was developed to simulate directional brightness temperature of row crop canopy. Based on simulation result of the FovMod, an optimal footprintfor field validation of LST was obtained. This thesis has systematically investigated the topic of directional thermal radiation and angular correction on surface temperature and its findings will improve the retrieval accuracy of temperature and emissivity from remotely sensed data and will also provide suggestion for the future design of airborne or spaceborne multi-angular thermal infrared sensors and also for the ground measurement of surface parameters.
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BRUNDU, DAVIDE. "Radiation hardness of the upgraded LHCb muon detector electronics and prospects for a full angular analysis in multi-body rare charm decays." Doctoral thesis, Università degli Studi di Cagliari, 2020. http://hdl.handle.net/11584/284134.

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In this dissertation the results of the studies on the new readout electronics for the muon system of the LHCb experiment, and the perspectives for carrying out a full angular analysis in the rare decays D0 -> pi+ pi- mu+ mu- and D0 -> K+ K- mu+ mu- will be described. The LHCb experiment studies the heavy hadron physics, containing charm or bottom quarks, in particular searching for new Charge-Parity (CP ) symmetry violation sources, searching for rare decays and studying their properties. LHCb produced leading results in these fields so far. In order to obtain more precise measurements or be able to study new observables, many analyses need a considerable increase in statistics, thus the experiment is now being upgraded to run with an higher instantaneous luminosity of proton-proton collisions. For this reason the readout electronics has been completely replaced by a new optimised version. Several tests have been performed on the new readout electronics that will be here discussed, and that have allowed a comprehensive radiation hardness characterization of the UMC 130 nm technology, used to develop the main electronics device of the muon system readout electronics, the nSYNC chip. On the other hand, in the last two years of data taking, 2017 and 2018, an excellent performance of the LHCb experiment has been obtained and the significant increase in statistics allowed access to new observables, especially in the field of rare decays. In particular, it has been possible to increase the statistics of rare four-body charm decays, like D0 -> pi+ pi- mu+ mu- and D0 -> K+ K- mu+ mu- , of which LHCb already carried out the branching fractions measurement, as well as of angular and CP asymmetries. Since interesting results and flavour anomalies have already been obtained from angular analyses of rare B decays, it is important to study the possibility of these analyses in the complementary sector of rare charm decays. In this work the perspectives for performing a full angular analysis with D0 -> pi+ pi- mu+ mu- and D0 -> K+ K- mu+ mu- decays will be discussed. An angular analysis will allow to carry out several Standard Model tests in the field of rare D decays, allowing also to measure theoretically clean observables for probing effects of physics beyond Standard Model, that can occur at high energy scale.
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Books on the topic "Multi-angular"

1

C, Weger R., Welch R. M, and United States. National Aeronautics and Space Administration., eds. Simultaneous retrieval of multiple aerosol parameters using a multi-angular approach. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Monitoring of the biophysical status of vegetation using multi-angular, hyperspectral remote sensing for the optimization of a physically-based SVAT model. Kiel: im Selbstverlag des Geographischen Instituts der Universität Kiel, 2010.

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Ninul, Anatolij Sergeevič. Tensor Trigonometry. Moscow, Russia: Fizmatlit Publisher, 2021.

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Ninul, Anatolij Sergeevič. Tenzornaja trigonometrija: Teorija i prilozenija / Theory and Applications /. Moscow, Russia: Mir Publisher, 2004.

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Aerosol retrieval using synthetic POLDER multi-angular data. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Angular Rate Estimation for Multi-Body Spacecraft Attitude Control. Storming Media, 2001.

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Book chapters on the topic "Multi-angular"

1

Lin, Hung-Yi, Ming-Ching Wu, Weileun Fang, and Ruey-Shing Huang. "Micromachined multi-lever linkage angular motion amplifier." In Transducers ’01 Eurosensors XV, 1274–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59497-7_300.

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Menenti, Massimo, Li Jia, and Zhao-Liang Li. "Multi-angular Thermal Infrared Observations of Terrestrial Vegetation." In Advances in Land Remote Sensing, 51–93. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6450-0_4.

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Pham, Quang, Seung Chae Yoon, Sun Ig Hong, and Hyoung Seop Kim. "Three Dimensional Numerical Investigation of Equal Channel Multi-Angular Pressing." In Materials Science Forum, 931–36. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-985-7.931.

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Li, Saiyi, David J. Alexander, Irene J. Beyerlein, and Donald W. Brown. "Texture Evolution during Multi-Pass Equal Channel Angular Extrusion of Beryllium." In Ceramic Transactions Series, 563–69. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470444191.ch63.

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Yan, Lei, Bin Yang, Feizhou Zhang, Yun Xiang, and Wei Chen. "Atmospheric Remote Sensing 3: Atmospheric Polarization Characteristics and Multi-angular Three-Dimensional Chromatography." In Polarization Remote Sensing Physics, 243–72. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2886-6_9.

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Quoc Anh, Nguyen Doan, and Hsiao-Yi Lee. "Improvement of Angular CCT Uniformity in Multi-Chip White LED with Silica–Phosphor Mixture." In Lecture Notes in Electrical Engineering, 1229–34. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04573-3_149.

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Zhang, Hao, Weidong Jin, Te Jiang, Yazhou Yang, and Pei Ma. "Laboratory Measurements of Multi-spectral, Polarization, and Angular Characteristics of Light Reflected from Particulate Samples." In Springer Series in Light Scattering, 47–86. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-10298-1_2.

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Bhushan, Rajesh Kumar, and Ashutosh Swain. "Interdependence of Eccentric Force and Torque on Joint Angle and Angular Velocity During Human Multi‑joint Leg Extension." In Recent Advances in Manufacturing, Automation, Design and Energy Technologies, 629–35. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4222-7_71.

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Townes, Charles H. "Surprise and Sociology in Multi-Disciplinary Sciences." In Very High Angular Resolution Imaging, 47–59. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0880-5_6.

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Reinheimer, T., K. H. Hofmann, and G. Weigelt. "Optical Interferometry in the Multi-Speckle Mode." In Very High Angular Resolution Imaging, 373–75. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0880-5_71.

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Conference papers on the topic "Multi-angular"

1

Saabni, Raid. "The multi angular descriptor (MAD)." In the 2nd International Workshop. New York, New York, USA: ACM Press, 2013. http://dx.doi.org/10.1145/2501115.2501128.

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Wyant, Andrea M., David M. Brown, Perry S. Edwards, and C. Russell Philbrick. "Multi-wavelength multi-angular lidar for aerosol characterization." In SPIE Defense, Security, and Sensing, edited by Monte D. Turner and Gary W. Kamerman. SPIE, 2009. http://dx.doi.org/10.1117/12.818686.

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WANG, YAN, and XUE-FEI GONG. "ANGULAR RESOLUTION OF MULTI-LISA CONSTELLATIONS." In Proceedings of the Ninth Asia-Pacific International Conference. WORLD SCIENTIFIC, 2010. http://dx.doi.org/10.1142/9789814307673_0008.

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Claussen, Holger, and Lester Ho. "Multi-carrier cell structures with angular offset." In 2012 IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC 2012). IEEE, 2012. http://dx.doi.org/10.1109/pimrc.2012.6362524.

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Lefebvre, Antoine, Thomas Corpetti, Jean Nabucet, and Laurence Hubert-Moy. "Urban vegetation extraction with multi-angular Pléiades images." In 2017 Joint Urban Remote Sensing Event (JURSE). IEEE, 2017. http://dx.doi.org/10.1109/jurse.2017.7924624.

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Borgese, Michele, Filippo Costa, Simone Genovesi, Agostino Monorchio, and Giuliano Manara. "Multi-frequency polarizarition converter with enhanced angular robustness." In 2016 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting. IEEE, 2016. http://dx.doi.org/10.1109/aps.2016.7696043.

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Born, N., L. M. Schneider, J. C. Balzer, I. Al-Naib, R. Singh, A. Velauthapillai, M. Scheller, J. V. Moloney, and Martin Koch. "Multi-band metamaterials with a distinguished angular sensitivity." In 2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). IEEE, 2015. http://dx.doi.org/10.1109/irmmw-thz.2015.7327908.

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Chen, Xuequan, and Emma Pickwell-MacPherson. "Multi-angular Terahertz Polarimetry for Complicated-structure Characterization." In 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall). IEEE, 2019. http://dx.doi.org/10.1109/piers-fall48861.2019.9021713.

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Zhao, Shaojie, Tao Zhang, and Yunqing Li. "Simulated Multi-Angular Microwave Radiation of Montainous Area." In IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2019. http://dx.doi.org/10.1109/igarss.2019.8898399.

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Dhanade, Yuvraj B., and Amalendu Patnaik. "Multi-mode Orbital Angular Momentum (OAM) Antenna Array." In 2021 IEEE Indian Conference on Antennas and Propagation (InCAP). IEEE, 2021. http://dx.doi.org/10.1109/incap52216.2021.9726354.

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Reports on the topic "Multi-angular"

1

Fernandes, R. A., S. G. Leblanc, and A. Simic. A Multi-Scale Analytical Canopy (MAC) Reflectance Model Based on the Angular Second Order Gap Size Distribution. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2003. http://dx.doi.org/10.4095/220028.

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