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Artykuły w czasopismach na temat "Polygonal SVS"
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CHEN, DANNY Z., XIAOBO S. HU, SHUANG (SEAN) LUAN, CHAO WANG i XIAODONG WU. "GEOMETRIC ALGORITHMS FOR STATIC LEAF SEQUENCING PROBLEMS IN RADIATION THERAPY". International Journal of Computational Geometry & Applications 14, nr 04n05 (październik 2004): 311–39. http://dx.doi.org/10.1142/s0218195904001494.
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The static leaf sequencing (SLS) problem arises in radiation therapy for cancer treatments, aiming to accomplish the delivery of a radiation prescription to a target tumor in the minimum amount of delivery time. Geometrically, the SLS problem can be formulated as a 3-D partition problem for which the 2-D problem of partitioning a polygonal domain (possibly with holes) into a minimum set of monotone polygons is a special case. In this paper, we present new geometric algorithms for a basic case of the 3-D SLS problem (which is also of clinical value) and for the general 3-D SLS problem. Our basic 3-D SLS algorithm, based on new geometric observations, produces guaranteed optimal quality solutions using O(1) Steiner points in polynomial time; the previously best known basic 3-D SLS algorithm gives optimal outputs only for the case without considering any Steiner points, and its time bound involves a multiplicative factor of a factorial function of the input. Our general 3-D SLS algorithm is based on our basic 3-D SLS algorithm and a polynomial time algorithm for partitioning a polygonal domain (possibly with holes) into a minimum set of x-monotone polygons, and has a fast running time. Experiments of our SLS algorithms and software in clinical settings have shown substantial improvements over the current most popular commercial treatment planning system and the most well-known SLS algorithm in medical literature. The radiotherapy plans produced by our software not only take significantly shorter delivery times, but also have a much better treatment quality. This proves the feasibility of our software and has led to its clinical applications at the Department of Radiation Oncology at the University of Maryland Medical Center. Some of our techniques and geometric procedures (e.g., for partitioning a polygonal domain into a minimum set of x-monotone polygons) are interesting in their own right.
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Belov, B., A. Trotsan i O. Vlasova. "Analysis of the structural and chemical state of the duplex – system of silicates – silicides of alkaline earth metals. Message 2. Duplex - system SiO2-MgO-CaO : Si-Mg–Ca". Casting processes 151, nr 1 (2.03.2022): 12–19. http://dx.doi.org/10.15407/plit2023.01.012.
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A polygonal diagram of the state of the CaO-SiO2-MgO ternary system was constructed in the entire range of concentrations of solid and liquid initial components, which increases the informativeness of polygonal diagrams of the state of metallurgical systems. The obtained results of the SCS analysis of the silicate and silicide phases of the duplex system SiO2–MgO–CaO : Si–Mg–Ca are the scientific basis for the optimization of blast furnace iron refining processes with smelting slags and magnesium alloys. Keywords: polygonal diagram, magnesium slag, silicate and silicide phases of calcium, physicochemical, technological and quantum-mechanical parameters.
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Wang, Yan Li, Ming Xu Zhang i De Xin Tan. "Shape-Controlled Pd Nanoparticles in the Mixed Surfactants by Ultrasonic Irradiation". Advanced Materials Research 430-432 (styczeń 2012): 655–58. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.655.
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nanoPd nanoparticles were prepared using ultrasonic irradiation in the PdCl2/H2O/EtOH solution by the addition of a quantity of hexadecyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulfonate (SDS) . The products were characterized by XRD、TEM and low temperature nitrogen adsorption-desorption. The effects of the composition of CTAB and SDS on the growth morphology of palladium nanoparticles were investigated. The results indicate that the size and morphology of the nanoPd particles were controllable by adjusting the ratio of CTAB and SDS. The polygonal nanoPd particles with a distributed size of 10-20 nm were obtained when the molar ratio of CTAB:SDS was 1:1 and the reaction time was 60min. The nanoparticles obtained by addition of two surfactants (CTAB and SDS) increased the BET surface area by 14 m2∙g-1compared to that obtained without surfactant.
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Gonçalves, Vítor, Araliya Mosleh, Cecília Vale i Pedro Aires Montenegro. "Wheel Out-of-Roundness Detection Using an Envelope Spectrum Analysis". Sensors 23, nr 4 (14.02.2023): 2138. http://dx.doi.org/10.3390/s23042138.
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This paper aims to detect railway vehicle wheel flats and polygonized wheels using an envelope spectrum analysis. First, a brief explanation of railway vehicle wheel problems is presented, focusing particularly on wheel flats and polygonal wheels. Then, three types of wheel flat profiles and three periodic out-of-roundness (OOR) harmonic order ranges for the polygonal wheels are evaluated in the simulations, along with analyses implemented using only healthy wheels for comparison. Moreover, the simulation implements track irregularity profiles modelled based on the US Federal Railroad Administration (FRA). From the numerical calculations, the dynamic responses of several strain gauges (SGs) and accelerometer sensors located on the rail between sleepers are evaluated. Regarding defective wheels, only the right wheel of the first wheelset is considered as a defective wheel, but the detection methodology works for various damaged wheels located in any position. The results from the application of the methodology show that the envelope spectrum analysis successfully distinguishes a healthy wheel from a defective one.
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Wu, Feng He, Qing Jing Yin, Jin Fen Wang i Yong Xin Li. "Redundant Points Removing of SFS Reconstructed Surface". Key Engineering Materials 579-580 (wrzesień 2013): 618–25. http://dx.doi.org/10.4028/www.scientific.net/kem.579-580.618.
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To remove the redundant points of image background in SFS reconstructed surface, a novel approach which combines the advantages of polygon scan and intersection algorithm and improves contour extraction method is proposed. In one hand, according to the gray scale level of pixels, the 3D profile of object is reconstructed by Shape from Shading method. In the other hand, firstly, the image is transformed into binary image through single-threshold segmentation method, the defects in image are remedied by morphological method, and the 2D contour of image is extracted through differential operator method; secondly, the image is divided into two parts using the polygon scan and intersection algorithm, that is the objective region and the background region; finally, the redundant points of image background in SFS reconstructed surface are removed through the fusing of 3D profile and 2D contour. Experiments shown that the proposed method can effectively remove the redundant points of SFS reconstructed surface, and it not only ensure the shape precision of SFS reconstructed surface, but also improve the universal of Shape from Shading technique.
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Wilson, John P., William P. Inskeep, Paul R. Rubright, Diana Cooksey, Jeffrey S. Jacobsen i Robert D. Snyder. "Coupling Geographic Information Systems and Models for Weed Control and Groundwater Protection". Weed Technology 7, nr 1 (marzec 1993): 255–64. http://dx.doi.org/10.1017/s0890037x00037234.
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The Chemical Movement through Layered Soils (CMLS) model was modified and combined with the USDA-SCS State Soil Geographic Data Base (STATSGO) and Montana Agricultural Potentials System (MAPS) digital databases to assess the likelihood of groundwater contamination from selected herbicides in Teton County, MT. The STATSGO and MAPS databases were overlaid to produce polygons with unique soil and climate characteristics and attribute tables containing only those data needed by the CMLS model. The Weather Generator (WGEN) computer simulation model was modified and used to generate daily precipitation and evapotranspiration values. A new algorithm was developed to estimate soil carbon as a function of soil depth. The depth of movement of the applied chemicals at the end of the growing season was estimated with CMLS for each of the soil series in the STATSGO soil mapping units and the results were entered into ARC/INFO to produce the final hazard maps showing best, weighted average, and worst case results for every unique combination (polygon) of soil mapping unit and climate. County weed infestation maps for leafy spurge and spotted knapweed were digitized and overlaid in ARC/INFO with the CMLS model results for picloram to illustrate how the results might be used to evaluate the threat to groundwater posed by current herbicide applications.
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YURTSEVA, OLGA V., ELENA E. SEVEROVA i EVGENY V. MAVRODIEV. "Persepolium (Polygoneae): A new genus in Polygonaceae based on conventional Maximum Parsimony and Three-taxon statement analyses of a comprehensive morphological dataset". Phytotaxa 314, nr 2 (25.07.2017): 151. http://dx.doi.org/10.11646/phytotaxa.314.2.1.
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Recent molecular studies revealed the polyphyletic nature of the broadly defined genus Polygonum. This paper includes a standard maximum parsimony (MP) and three-taxon statement analyses (3TA) as well as a taxonomic revision of Polygonum sect. Avicularia subsect. Spinescentia (Polygonaceae) as compared with two closely related taxa: genus Atraphaxis s.s., and genus Bactria. In total, 27 characters, including life history, habit, morphology of the shoots, leaf blades, ocreas, perianth, achene, ultrasculpture of perianth and achene surfaces, as well as pollen morphology, were analyzed, illustrated, and discussed in detail. Both the standard MP and 3TA confirm that monophyletic Polygonum subsect. Spinescentia is sister to the narrowly defined Atraphaxis. The genus Persepolium (Polygonum subsect. Spinescentia), with the circumscription of five species, is established as new to science as a result of this study. Possible transformations of perianth and thyrse morphology are discussed within the framework of the Principle of variable proportions by Troll in connection with a shift of pollination mode in the group of taxa studied.
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Hurd, Spencer P. "An Application of the Criteria ASASA for Quadrilaterals". Mathematics Teacher 81, nr 2 (luty 1988): 124–26. http://dx.doi.org/10.5951/mt.81.2.0124.
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Two polygons are congruent if a correspondence exists between vertices such that corresponding sides and angles are congruent. If the polygons are triangles then each has six parts that must correspond exactly, the three sides and three angles. But, as we all know, the congruence of two triangles can be det ermined from the congruence of only three of these six parts provided that the three parts are chosen according to the familiar rules SSS, SAS, ASA, or AAS.
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Nagaoka, Yasutaka, Hua Zhu, Dennis Eggert i Ou Chen. "Single-component quasicrystalline nanocrystal superlattices through flexible polygon tiling rule". Science 362, nr 6421 (20.12.2018): 1396–400. http://dx.doi.org/10.1126/science.aav0790.
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Quasicrystalline superlattices (QC-SLs) generated from single-component colloidal building blocks have been predicted by computer simulations but are challenging to reproduce experimentally. We discovered that 10-fold QC-SLs could self-organize from truncated tetrahedral quantum dots with anisotropic patchiness. Transmission electron microscopy and tomography measurements allow structural reconstruction of the QC-SL from the nanoscale packing to the atomic-scale orientation alignments. The unique QC order leads to a tiling concept, the “flexible polygon tiling rule,” that replicates the experimental observations. The keys for the single-component QC-SL formation were identified to be the anisotropic shape and patchiness of the building blocks and the assembly microscopic environment. Our discovery may spur the creation of various superstructures using anisotropic objects through an enthalpy-driven route.
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Rashkovan, A., S. D. Amar, U. Bieder i G. Ziskind. "Analysis of Polygonal Vortex Flows in a Cylinder with a Rotating Bottom". Applied Sciences 11, nr 3 (2.02.2021): 1348. http://dx.doi.org/10.3390/app11031348.
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The present paper provides a physically sound numerical modeling of liquid flows experimentally observed inside a vertical circular cylinder with a stationary envelope, rotating bottom and open top. In these flows, the resulting vortex depth may be such that the rotating bottom disk becomes partially exposed, and rather peculiar polygon shapes appear. The parameters and features of this work are chosen based on a careful analysis of the literature. Accordingly, the cylinder inner radius is 145 mm and the initial water height is 60 mm. The experiments with bottom disk rotation frequencies of 3.0, 3.4, 4.0 and 4.6 Hz are simulated. The chosen frequency range encompasses the regions of ellipse and triangle shapes as observed in the experimental studies reported in the literature. The free surface flow is expected to be turbulent, with the Reynolds number of O(105). The Large Eddy Simulation (LES) is adopted as the numerical approach, with a localized dynamic Subgrid-Scale Stresses (SGS) model including an energy equation. Since the flow obviously requires a surface tracking or capturing method, a volume-of-fluid (VOF) approach has been chosen based on the findings, where this method provided stable shapes in the ranges of parameters found in the corresponding experiments. Expected ellipse and triangle shapes are revealed and analyzed. A detailed character of the numerical results allows for an in-depth discussion and analysis of the mechanisms and features which accompany the characteristic shapes and their alterations. As a result, a unique insight into the polygon flow structures is provided.
Rozprawy doktorskie na temat "Polygonal SVS"
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Al, Nachar Rabih. "Vers un efficace détecteur de trait : Les coins de contour et ses applications". Thesis, Versailles-St Quentin en Yvelines, 2014. http://www.theses.fr/2014VERS0054/document.
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Nous proposons dans cette thèse un nouveau détecteur de « Coins » de contour dans une image. Ces coins sont les sommets de la ligne polygonale approximant le contour. Ils peuvent appartenir ou non au contour. Ils correspondent à une déviation importante de la direction de ce contour. Aussi, ils sont répétables en présence de transformations affines ou similitudes et sont robustes au bruit présent aux frontières d'une image. Grâce à cette répétabilité, les coins sont utilisés dans une application de reconnaissance de la forme.Les coins peuvent être classés selon leur force. Ainsi sous ensemble de ces coins,appelé "Coins Dominants", peuvent être extraits formant les sommets du polygone« minimal » qui représente le contour, pour un nombre de segments donné. Deux applications, basées sur les Coins/Coins Dominants du contour ont été réalisées : La première est une application de recalage d’images où de nouvelles primitives invariantes constituées de quatre "Coins Dominants" du contour ont été proposées. La seconde application est la reconnaissance des caractères dans une image déformée où les coins du contour des caractères ont été utilisés dans un processus de segmentation / reconnaissance simultanéIn this thesis, a new feature detector is proposed. The new features are edgecorners located on the contours of a studied image. These points are edge pointswhere a deviation in the edge direction occurs. In addition, they are repeatable versussimilarity, affine transformations and also robust to noise at the boundaries of theobject's image. Due to their repeatability, these corners are used in a shape recognitionapplication. Also, a smaller set of corners called "Dominant Corners" or "DCs" isextracted form the original set of corners using a new proposed polygonalapproximation algorithm. These DCs form the vertices of a polygon that bestapproximate their contour. Two applications using the edge corners are alsodeveloped. The first one is an image registration application that forms invariantprimitives using the DCs. The second application is a word recognition applicationwhere the edge corners located on the characters contours are used in a simultaneoussegmentation/recognition process to recognize the characters in a deformed wordimage
Części książek na temat "Polygonal SVS"
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Bell, Frank W. "Emergency Alerting Technologies Relevant to Forest Fires". W Advances in Forest Fire Research 2022, 1452–56. Imprensa da Universidade de Coimbra, 2022. http://dx.doi.org/10.14195/978-989-26-2298-9_221.
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California wild and forest fires in 2017 resulted in over 100 fatalities. While WEA alerts were transmitted to mobiles in selected areas, the power and network outages limited their delivery. WEA is similar to the SMS Broadcast system used elsewhere. It does not require subscription, and can be geotargeted, usually by map polygon. There are already available and in development other alerting technologies. The Emergency Alert System on radio and TV in the U.S. has been in use for many years. It is a broadcast break-in system the overrides program content. This was used in one location for the wildfires, but not elsewhere as geotargeting is not possible with this system. It is and analog broadcast technology architecture. AM and FM Broadcast in the U.S. now has HD Radio that is mixed analog and digital. A limited data message can be carried and used for selective delivery of messages. DAB, DAB+ and DRM also can carry a message payload, which can be used for a selective delivery mechanism when the receiver has location position. This may be in a vehicle radio/navigation system. The current digital television system in the U.S. and some other countries is now being replaced by ATSC 3.0. This provided a superior modulation format, Layered Division Multiplexing (LDM) for delivery of program content and alerts to suitable mobiles. An IC for UHF reception and prototype mobiles have been developed. No external antenna is required. Bothe of these new technologies are tested as delivering alerts independently of the mobile network. Within the limitations of radio and TV propagation, such capabilities would provide technology redundancy. The television signal propagation may be limited in rural areas, but ATSC 3.0 is capable of having on frequency repeaters to make a single frequency network for improved coverage of program content and alerting. Multilingual alerts based on the CAP Event Terms list with Message Formats are being provided for.
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Arnold, Christopher G., i Richard P. Appelbaum. "The Use of GIS to Measure Spatial Patterns of Ethnic Firms in the Los Angeles Garment Industry". W Anthropology, Space, and Geographic Information Systems. Oxford University Press, 1996. http://dx.doi.org/10.1093/oso/9780195085754.003.0006.
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The purpose of this chapter is to describe the methodology and present some initial results in our efforts to understand the role of spatial organization in ethnic economies of the Los Angeles garment industry. Our research goal was to provide a spatial dimension to our database in order to test theories maintaining that space is a critical component of economic transactions. To this end, we created analytical grids of various resolutions using three GIS functions: address matching, polygon generation, and identity overlay. The grids were then transformed into matrices and tested for spatial autocorrelations using Statistical Analysis System (SAS) routines proposed by Griffith (1992). The following section presents brief arguments for the importance of space from the perspectives of industrial district and ethnic economy theories. The third section describes the research site and data sources. The fourth section outlines the analytical concerns of spatial autocorrelation and the modifiable areal unit problem (MAUP), which leads to a discussion of the relevant GIS operations in the fifth section. The sixth section presents spatial autocorrelation measures that show a direct relationship between spatial concentration and economic success in the Los Angeles garment district. The concluding section summarizes the importance of GIS as an analytical tool. Both industrial district and ethnic economy perspectives are based on assumptions about the importance of space. Business economists and geographers show that arrangements within spatially concentrated, tightly integrated industrial districts are critical to globally competitive industries, rapid information flow, lowered transaction costs, and increased control over production, permitting quick and flexible responses to changing market demands (Scott and Mattingly 1989; Piore and Sable 1884; Storper and Walker 1992; Storper and Christopherson 1987). In particular, Porter (1990)—a Harvard Business School economist and member of former President Reagan’s Council on Competitiveness— emphasizes that geographic concentration increases local competition as well as fostering such “emotional factors” as trust, pride, and bragging rights. Spatial concentration, while less prominent in discussions of ethnic economies, remains an underlying factor in providing a venue for the exchange of cultural capital.
Streszczenia konferencji na temat "Polygonal SVS"
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Xuan, Xiaojing, Fangmin Dong, Shuifa Sun i Bangjun Lei. "An algorithm of polygonal approximation constrained by the offset direction". W 2014 IEEE Symposium On Swarm Intelligence (SIS). IEEE, 2014. http://dx.doi.org/10.1109/sis.2014.7011798.
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Ozcan, Ismail. "FUZZY PROFIT FOR LINEAR DEMAND FUNCTIONS USING POLYGONAL FUZZY NUMBERS". W 6th SWS International Scientific Conference on Social Sciences ISCSS 2019. STEF92 Technology, 2019. http://dx.doi.org/10.5593/sws.iscss.2019.2/s05.103.
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Pishnery, Joseph E., i Craig P. Lusk. "A Statically Balanced Shape Shifting Surface". W ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70689.
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This paper presents a concept for producing a Statically Balanced Shape-Shifting Surface (SB-SSS). In this context, an SB-SSS is a surface that can require near-zero magnitude force changes to accomplish a change in shape while retaining effectiveness as a physical barrier. This paper focuses on how to statically balance a specifically-designed compliant mechanism and how to incorporate this mechanism into a polygonal cell. The mechanism consists of a compliant Peaucellier-Lipkin linkage layered with a pre-stressed link as the balancer. Prior art is presented that can show how a polygonal cell can be incorporated into a surface via a tiling array. Specifically shaped overlapping thin plates are used to retain the physical barrier requirement. The demonstration of a virtually zero-force Shape-Shifting Surface (SSS) suggests that SSS’s can be designed with a wide range of force-displacement properties, i.e. ranging from that of a square of the parent material to the zero-force mechanism presented here. Applications for an SB-SSS may be macro-scale or micro-scale and may include sensors, biomedical applications, defense applications, and variable stiffness materials.
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Ozcan, Ismail. "CONSUMER SURPLUS OF THE QUADRATIC DEMAND FUNCTION AND PRODUCER SURPLUS OF THE QUADRATIC SUPPLY FUNCTION BY FUZZIFYING POLYGONAL FUZZY NUMBERS AND DEFUZZIFYING GRADED MEAN". W 6th SWS International Scientific Conference on Social Sciences ISCSS 2019. STEF92 Technology, 2019. http://dx.doi.org/10.5593/sws.iscss.2019.2/s04.008.
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Lusk, Craig, i Daniel E. Perez. "Shield Design for Shape-Shifting Surfaces". W ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12186.
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Shape-Shifting Surfaces (SSSs) are multilayered surfaces that are able to change shape while maintaining their integrity as physical barriers. SSSs are composed of polygonal unit cells, which can change side lengths and corner angles. These changes are made possible by each side and corner consisting of at least two different shields, or layers of material. As the layers undergo relative motion, the unit cell changes shape. In order for the SSS to retain its effectiveness as a barrier, no gaps can open between different layers. Also, the layers cannot protrude past the boundaries of the unit cell. Based on these requirements, a design space exploration was performed to determine, using equilateral triangle unit cells and triangular shields, the maximum deformation range of a unit cell. It was found that the triangular shields with maximum allowable deformation were right triangles with one of the angles being equal to 37.25 degrees and the adjacent side equal to 61% of the side length of the unit cell. The key contribution of this paper is a first algorithm for systematic SSS shield design. Possible applications for SSSs include protection, by creating body-armor systems; reconfigurable antennas able to broadcast through different frequencies; recreational uses, and biomedical applications.