Добірка наукової літератури з теми "Angle rasant"
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Статті в журналах з теми "Angle rasant":
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Aperador Chaparro, W., J. Bautista Ruiz, and A. Vargas Uscátegui. "Evaluación de la corrosión-erosión en aceros austeníticos y martensíticos. (Evaluation for Corrosion-Erosion in Austenitic and Martensitic Steels.)." CIENCIA EN DESARROLLO 6, no. 1 (July 7, 2015): 17. http://dx.doi.org/10.19053/01217488.3645.
Анотація:
ResumenEn este trabajo se presentan los resultados de evaluar la resistencia a la corrosión dinámica, la erosión y la corrosión-erosión, a ángulos de impacto de 30◦ y 90◦, con respecto a la superficie de la muestra, en aceros ASTM 240 (A240) o AISI 304 y ASTM 576 (A576) o AISI 1045. La caracterización electroquímica sedesarrolló mediante la técnica de curvas de polarización de Tafel, y la caracterización microestructural por microscopía electrónica de barrido. Se encontró una disminución notable en la velocidad de corrosión para los aceros A240 en comparación con el A576, bajo condiciones de corrosión dinámica y corrosiónerosión. El desgaste mecánico indicó que la condición de ángulo normal representa mayores pérdidas de espesor del material, en comparación con el ángulo rasante, para las dos clases de aceros. Al comparar los diferentes materiales de estudio, en condición de ángulo normal y rasante, se observó claramente que el acero A576 presenta los mayores valores de pérdida de volumen, en igualdad de condiciones (igual tiempo de exposición), en comparación con el acero A240. La aplicación de la técnica de microscopía electrónica de barrido permitió evaluar los mecanismos de daño dominantes y corroboraron los resultados obtenidos por las mediciones electroquímicas. AbstractThis paper presents the results of evaluating the dynamic corrosion resistance, the erosion and corrosionerosion, to impact angles of 30 and 90, with respect to the sample surface in steel ASTM 240 (A240) or AISI 304 and steel ASTM 576 (A576) or AISI 1045. The electrochemical characterization was developed by the Tafel polarization curves and the micro-structural characterization by the scanning electron microscopy. There was a marked decrease in the corrosion rate for steel A 240 compared with A576, under the erosion corrosion and corrosion dynamics conditions. Mechanical wear indicated that the normal angle condition represents higher losses in the material thickness, compared to the grazing angle for the two classes of steels. When comparing the dierent study materials in normal condition and grazing angle, it is clearly observed that the steel ASTM A576 has the highest loss values volume, in equal exposure time, in comparison with the A240 steel. The scanning electron microscopy application techniques allowed to assess the dominant damage mechanisms and corroborated the results obtained by the electrochemical measurements.
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Ozendi, Mustafa, Hüseyin Topan, Ali Cam, and Çağlar Bayık. "PAN SHARPENING QUALITY INVESTIGATION OF TURKISH IN-OPERATION REMOTE SENSING SATELLITES: APPLICATIONS WITH RASAT AND GÖKTÜRK-2 IMAGES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W1 (October 26, 2016): 131–35. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w1-131-2016.
Анотація:
Recently two optical remote sensing satellites, RASAT and GÖKTÜRK-2, launched successfully by the Republic of Turkey. RASAT has 7.5 m panchromatic, and 15 m visible bands whereas GÖKTÜRK-2 has 2.5 m panchromatic and 5 m VNIR (Visible and Near Infrared) bands. These bands with various resolutions can be fused by pan-sharpening methods which is an important application area of optical remote sensing imagery. So that, the high geometric resolution of panchromatic band and the high spectral resolution of VNIR bands can be merged. In the literature there are many pan-sharpening methods. However, there is not a standard framework for quality investigation of pan-sharpened imagery.<br><br> The aim of this study is to investigate pan-sharpening performance of RASAT and GÖKTÜRK-2 images. For this purpose, pan-sharpened images are generated using most popular pan-sharpening methods IHS, Brovey and PCA at first. This procedure is followed by quantitative evaluation of pan-sharpened images using Correlation Coefficient (CC), Root Mean Square Error (RMSE), Relative Average Spectral Error (RASE), Spectral Angle Mapper (SAM) and Erreur Relative Globale Adimensionnelle de Synthése (ERGAS) metrics. For generation of pan-sharpened images and computation of metrics SharpQ tool is used which is developed with MATLAB computing language. According to metrics, PCA derived pan-sharpened image is the most similar one to multispectral image for RASAT, and Brovey derived pan-sharpened image is the most similar one to multispectral image for GÖKTÜRK-2. Finally, pan-sharpened images are evaluated qualitatively in terms of object availability and completeness for various land covers (such as urban, forest and flat areas) by a group of operators who are experienced in remote sensing imagery.
Дисертації з теми "Angle rasant":
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Rahali, Radia. "Structuration of SrTiO3 surfaces and MoS2 2D material induced by swift heavy ion irradiation at grazing incidence." Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC203.
Анотація:
La modification des matériaux a permis de faire des progrès significatifs dans les domaines technologiques en permettant un contrôle et une manipulation précis des propriétés des matériaux. Pour garantir le succès des applications, il est essentiel de disposer de techniques permettant de contrôler la taille, la forme et la morphologie des structures créées. Cette thèse explore l'utilisation d'ions lourds rapides (SHI) pour créer des nano- et microstructures sur les surfaces du titanate de strontium (SrTiO3) et du disulfure de molybdène (MoS2) avec une géométrie d'incidence rasante. Les résultats démontrent que l'irradiation aux ions lourds rapides peut induire diverses modifications de surface, telles que chaines de nanobosses, des cratères, des structures ondulatoires et de l'amorphisation. La thèse démontre qu'en ajustant la fluence et l'angle d'incidence du faisceau d'ions, des structures d'onde périodiques peuvent être formées sur la surface de SrTiO3. Ces structures peuvent avoir des tailles différentes, avec des tranchées plus ou moins prononcées. Cette structure peut être utilisée pour des dépôts de couches de matériaux bidimensionnels et obtenir des hétéro-structures avec des interfaces bien définies. Les résultats démontrent également que l'irradiation peut induire des pliages dans des échantillons monocouches de MoS2. L'angle d'incidence du faisceau d'ions et le substrat utilisé peuvent contrôler les défauts. Le choix du substrat peut également influencer la densité et la longueur des plis. Il est montré que l'utilisation de SrTiO3 comme substrat permet la création de plis de longueurs variables sans la nécessité de conditions d'orientation cristallographique spécifiquesMaterials modification has enabled significant advancements in the technological fields by allowing for precise control and manipulation of material properties. To ensure successful applications, it is crucial to have techniques that offer control over the size, shape, and morphology of the structures created. This thesis explores the use of swift heavy ions (SHI) to create nano- and microstructures on the surfaces of strontium titanate (SrTiO3) and molybdenum disulphide (MoS2) under grazing incidence geometry. The results show that SHI irradiation can induce various surface modifications, such as elongated surface defects, wave-like structures, and amorphization. This research demonstrates that by adjusting the fluence and angle of incidence of the ion beam, periodic wave-like structures can be formed on the surface of SrTiO3. These structures can be deepened to obtain more pronounced valley, which can be used to directly grow two-dimensional materials and obtain heterostructures with well-defined interfaces. The results also demonstrates that SHI irradiation can induce foldings in MoS2 samples. The angle of incidence of the ion beam and the substrate used can control the defects. The choice of substrate can also influence folds density and length. It is shown that using SrTiO3 as a substrate allows the folding with variable lengths without the need for specific crystallographic orientation conditions
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Robach, Odile. "Étude in situ de la croissance de Ag sur MgO(001) et de Ni/Ag(001), et étude de la nitruration du GaAs par diffusion de rayons X en incidence rasante." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10226.
Анотація:
Un nouvel instrument est presente, qui permet l'elaboration d'interfaces dans une chambre ultra-vide et l'etude in situ de leur structure et de leur morphologie par diffusion des rayons x en incidence rasante (dxir). Il est installe sur la ligne de lumiere crg/if d32 de l'esrf. Une nouvelle description du mode de croissance de l'ag sur le mgo est proposee, dans laquelle, des 0. 2 monocouches (mc) d'ag deposees, le depot est sous forme d'ilots et la majorite de l'ag est relaxee. La signification physique de la fraction en site de l'ag est discutee, ainsi que les possibilites de calcul des positions atomiques dans un ilot d'ag deforme par les contraintes d'epitaxie dues au mgo. La preparation de surfaces de mgo bien adaptees aux etudes par dxir est decrite. Les phases presentes dans differents depots de ni sur ag (001) ont ete identifiees et caracterisees. A tous les montants de depots de 1 a 20 mc, trois phases coexistent : du ni en site, du ni (001) relaxe et du ni (011) 4h, qui forment des colonnes s'etendant jusqu'a la surface du depot. Une rugosification de l'ag liee au depot de ni a ete mise en evidence, ainsi que de fortes deformations de l'ag. La nitruration a l'aide d'une source d'azote a resonance cyclotron electronique (ecr) des surfaces (001) et (-1-1-1)b du gaas a ete etudiee. Pour former une couche de gan d'epaisseur bien definie il est preferable de separer la phase d'implantation des atomes d'azote dans le gaas de la phase de recuit declenchant la formation du gan. Des developpements de la technique d'analyse sont presentes, qui concernent en particulier les calculs de resolution instrumentale et l'analyse des donnees de diffusion aux petits angles en incidence rasante.
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Sajjad, Naheed. "Bistatic scattering of electromagnetic waves from rough surface by using second order twoscale model : application to sea and bare soil surface." Brest, 2011. http://www.theses.fr/2011BRES2049.
Анотація:
The estimation of radar cross section (RCS) of randomly rough surfaces is essential for designing terrain and sea surface remote sensing systems. The particular problem of wave scattering at low grazing angles is of great interest because of its importance for the low-altitude/long-range radar surveillance, target tracking, communication and navigation systems operating at low grazing conditions above the rough surface. The radar cross section from a rough surface becomes very small at grazing incidence, since most part of the incident power is scattered around the specular direction (depending on the degree of surface roughness). Moreover, the dominant scattering mechanisms at low and high grazing angles are different e. G. , the effects of multiple scattering (or higher order scattering), shadowing, fading and mechanisms attributable to wave breaking are particularly marked in the low grazing angle regime. Therefore, in this context the research has been conducted in this thesis. A second order two-scale model (TSM2) has been developed to study the bistatic scattering enhancement at grazing angles and the accurate depolarization estimation in a radar return. The applications of TSM2 are presented for sea and bare soil surfaces. The results obtained from newly developed model are compared with the available experimental data and other models to demonstrate the validity and efficiency of TSM2L’estimation de la surface équivalente radar (SER) des fouillis de mer et terrestre est essentielle pour la conception et l’amélioration des performances des systèmes de télédétection et d’observation de la planète. Le problème particulier de la diffusion des ondes en configuration à angle rasant est de grand intérêt à cause de son importance pour la surveillance, suivi de cible, la communication et les systèmes de navigation fonctionnant au-dessus de surfaces rugueuses, terrestre ou maritime. La surface équivalente radar d’une surface rugueuse devient très faible en incidence rasante puisque la plus grande partie de la puissance incidente est diffusée dans la direction spéculaire (selon le degré de rugosité de k surface). De plus, les mécanismes principaux de diffusion sont différents aux angles rasants, par exemple, les effets de diffusion multiple (ou de diffusion d’ordre supérieur), l’ombrage, fading et les mécanismes liés au déferlement des vagues sont particulièrement présents dans une telle configuration. Par conséquent, c’est dans ce contexte que s’intègre les travaux de recherche développés dans cette thèse. Ceci en développant le modèle deux échelles à l’ordre 2 (TSM2) permettant ainsi de contribuer à l’estimation des coefficients de diffusion bistatique par les surfaces rugueuses avec l’application de ce modèle aux surfaces maritime et terrestre. L’évaluation du modèle développé est réalisée en effectuant des comparaisons par rapport aux résultats obtenus avec d’autres modèles et aussi aux données issues de la littérature ouverte
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Gasperini, Antonio Augusto Malfatti 1982. "Estudo do processo de formação de nanopartículas de GeSi em matriz de sílica por técnicas de luz síncrotron." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277863.
Анотація:
Orientadores: Gustavo de Medeiros Azevedo, Ângelo Malachias de Souza, Eduardo Granado Monteiro da SilvaTese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: Neste trabalho estudamos a formação e estrutura de nanopartículas (NPs) de GeSi encapsuladas em sílica, utilizando técnicas baseadas em luz síncrotron, complementadas com imagens de microscopia eletrônica de transmissão. Obtivemos a forma, o diâmetro médio e a dispersão de tamanhos usando espalhamento de raios X a baixos ângulos em incidência rasante (GISAXS). A partir dos dados de difração de raios X (XRD) foi possível obter a fase cristalina, o parâmetro de rede e o tamanho médio dos cristalitos. Estes resultados serviram como dados de entrada em um modelo para análise através da técnica de estrutura fina de absorção de raios X (EXAFS), a qual forneceu informações sobre a estrutura local na vizinhança dos átomos de Ge. Apesar dos resultados de cada uma das técnicas acima serem comumente analisados de forma separada, a combinação destas técnicas leva a uma melhor compreensão das propriedades estruturais das NPs. Através da combinação dos resultados tivemos acesso a informações tais como a deformação da rede cristalina (strain), a fração de átomos cm ambientes cristalino e amorfo, a fração de átomos de Ge diluída na matriz e a possibilidade de formação de estruturas do tipo core-shell cristalino-amorfo. Resultados adicionais como a origem do strain e a temperatura de solidificação das NPs, dentre outros, foram obtidos através de um experimento in situ de absorção de raios X em energia dispersiva (DXAS), inédito na análise deste sistema. Por fim, utilizamos as técnicas acima citadas para acompanhar a evolução dos parâmetros estruturais em amostras tratadas termicamente durante diferentes intervalos de tempo
Abstract: In this work we study the formation and structure of GeSi nanoparticles embedded in silica matrix using synchrotron-based techniques complemented by TEM images. Shape, average diameter and size dispersion were obtained from grazing incidence small angle X-ray scattering. X-ray diffraction measurements were used to obtain crystalline phase, lattice parameter and crystallite mean sizes. By using these techniques as input for extended X-ray absorption fine structure analysis, the local structure surrounding Ge atoms is investigated. Although the results for each of the methods mentioned above are usually analyzed separately, the combination of such techniques leads to an improved understanding of nanoparticle structural properties. Crucial indirect parameters that cannot be quantified by other means are accessed in our work, such as local strain, possibility of forming core-shell crystalline-amorphous structures, fraction of Ge atoms diluted in the matrix and amorphous and crystalline Ge fraction. Additional results as the origin of the strain and temperature of solidification of NPs, among others, were obtained through an in situ energy dispersive X-ray absorption experiment (DXAS), unheard in this system. Finally, we use the techniques mentioned above to monitor the evolution of the structural parameters of samples annealed during different time intervals
Doutorado
Física
Doutor em Ciências
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Liscio, Fabiola. "Nanostructures magnetiques auto-assemblees sur des surfaces a faible energie par epitaxie par jets moleculaires." Phd thesis, 2009. http://tel.archives-ouvertes.fr/tel-00391031.
Анотація:
Les nanostructures d'alliages MxPt1x (M=Co et Fe) developpent des anisotropies magnetiques perpendiculaires, très interessantes pour des applications dans le domaine de l'enregistrement a haute densite. Dans ce travail de these, la nature du substrat (structure, symetrie et energie de surface) et l'in uence de la temperature de co-deposition sur les proprietes structurales et magnetiques des nanostructures ont ete etudies. La methode a consiste a deposer des atomes de metaux de transition par epitaxie a jets moleculaires sur les surfaces WSe2(001) et NaCl(001) de faible energie. Elle a conduit a la formation de nanostructures modeles, non contraintes dont les proprietes ont ete determinees par differentes techniques (diffraction X, XAFS, GISAXS, MET, STM et magnetometrie SQUID). Les effets de mise en ordre chimique a courte et a longue distance et l'infl uence de la morphologie et de la direction de croissance sur les proprietes magnetiques ont ete clairement demontres.
Книги з теми "Angle rasant":
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Mankell, Henning. Minnet av en smutsig angel [Imported] [Paperback]. Pocketförlaget, 2012.
Частини книг з теми "Angle rasant":
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Hebblethwaite, Benjamin. "The Rada Rite in Haiti." In A Transatlantic History of Haitian Vodou, 134–82. University Press of Mississippi, 2021. http://dx.doi.org/10.14325/mississippi/9781496835604.003.0004.
Анотація:
Chapter 3 analyzes the history and content of the Rada Rite, including its ceremony, cycles of salutation, stations of salutation, and rituals. The names of 102 Rada Rite spirits are provided with linguistic and cultural features. The chapter includes 25 Haitian Creole and English facing-page songs by the contemporary Vodou group “Rasin Figuier” that focus on Rada Rite themes and spirits, including Ginen, ounsi kanzo (“initiates”), Papa Legba, Gran Chemen, Marasa, Lesen, Bondye (“God”), Loko, the angel Gabriel, Agaou, Ayizan, Danbala Wèdo, Ayida Wèdo, Vodou flags, the white of Rada, Èzili Freda, Agwe Tawoyo, Nago Rite songs for Ogou Balizay and Olicha, plus a few chante pwen (“songs of criticism”) that address political feuding, literacy, and national unity. The method of Vodou hermeneutics reads in history, religious studies, linguistics, literary criticism, and ethnomusicology to interpret Rasin Figuier’s Rada songs focused on life, order, and rootedness.
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Kolar, Edvard. "Strateški management športnih organizacij." In Management v športu: Izbrana poglavja, 107–46. Univerza v Mariboru, Univerzitetna založba, 2023. http://dx.doi.org/10.18690/um.fov.1.2023.5.
Анотація:
Organizacije, ki nastajajo v človekovem širšem in ožjem okolju, nastajajo zaradi določenih namenov (angl. purpose), ki jih želijo uresničiti s svojim delovanjem. Uresničevanje namena organizacije pa je vedno neločljivo povezano z doseganjem uspešnosti, ki bo imela neposreden vpliv na rast in razvoj organizacije, ter neposredne ali posredne vplive na širše in ožje okolje organizacije. »Zakaj?«, »Kaj?« in »Kako?« so torej tri osnovna vprašanja, na katera moramo odgovoriti, kadar razmišljamo o bodočem razvoju oziroma »strategiji« vsake organizacije. Strateški management je eno od področij strokovno-znanstvene vede, ki jo imenujemo management. V praksi je bil do nedavnega predvsem v domeni pridobitnih (profitnih) organizacij in s tega vidika smiselno povezan predvsem z gospodarskimi združbami. Ne glede na to pa je proces strateškega upravljanja in managementa neobhodnega pomena tudi za obstoj in razvoj športnih organizacij. V prispevku bo opredeljen strateški management in predstavljen model strateškega managementa, ki ga lahko uporabimo pri razvoju strategije poljubne športne organizacije.
Тези доповідей конференцій з теми "Angle rasant":
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Tekinalp, Ozan, Tuba Elmas, and Ilkay Yavrucuk. "Gimbal angle restricted control moment gyroscope clusters." In 2009 4th International Conference on Recent Advances in Space Technologies (RAST). IEEE, 2009. http://dx.doi.org/10.1109/rast.2009.5158259.
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Eren, Tolga. "Using Angle Information Between Drected Lnks in Coordinating Saellite Custers." In 2007 3rd International Conference on Recent Advances in Space Technologies. IEEE, 2007. http://dx.doi.org/10.1109/rast.2007.4284057.
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Unsalan, Cemr. "Detecting Changes in Multispectral Satellite Images using Time Dependent Angle Vegetation Indices." In 2007 3rd International Conference on Recent Advances in Space Technologies. IEEE, 2007. http://dx.doi.org/10.1109/rast.2007.4284009.
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Örengül, Ömer Utku, Kürşat Yenidoğan, and Tahsin Çağrı Şişman. "Artificial Neural Network Based Initial Orbit Determination for Angle-Only Data." In 2023 10th International Conference on Recent Advances in Air and Space Technologies (RAST). IEEE, 2023. http://dx.doi.org/10.1109/rast57548.2023.10197961.
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Chelaru, Teodor-Viorel, Barbu Cristian, and Adrian Chelaru. "Mathematical model for small satellites, using rotation angles and optimal control synthesis." In 2011 5th International Conference on Recent Advances in Space Technologies (RAST). IEEE, 2011. http://dx.doi.org/10.1109/rast.2011.5966874.
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Gokce, Murat, Ferhat Arberkli, Seda Aydin, and Mehmet Rauf Geden. "Improved Orbit Estimation Using Angles-Only Observations and Its Application to Low Earth Orbit Satellites." In 2019 9th International Conference on Recent Advances in Space Technologies (RAST). IEEE, 2019. http://dx.doi.org/10.1109/rast.2019.8767829.