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Статті в журналах з теми "Radial parallel projection"
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Rosado, M., R. F. Gabbasov, P. Repetto, I. Fuentes-Carrera, P. Amram, M. Martos, and O. Hernandez. "2D kinematics of the edge-on spiral galaxy ESO 379-006." Proceedings of the International Astronomical Union 8, S295 (August 2012): 234–35. http://dx.doi.org/10.1017/s1743921313004894.
Повний текст джерелаАнотація:
AbstractWe present a kinematical study of the marginally edge-on galaxy ESO 379-006. With Fabry-Perot spectroscopy at Hα we obtain velocity maps, the radial velocity field, and position-velocity diagrams parallel to the major and to the minor axis of the galaxy. We build the rotation curve of the galaxy and discuss the role of projection effects. The twisting of isovelocities in the radial velocity field of the disk of ESO 379-006 as well as a kinematical asymmetry found in the position-velocity diagrams parallel to the minor axis suggest the existence of non-circular motions that can be modeled by including a radial inflow besides the rotation motion. Extraplanar Diffuse Ionized gas was detected in this galaxy both from the images and from its kinematics. It is possible that the diffuse gas is lagging in rotation.
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Dravins, D., L. Lindegren, S. Madsen, and J. Holmberg. "Astrometric Radial Velocities From Hipparcos." Highlights of Astronomy 11, no. 1 (1998): 564. http://dx.doi.org/10.1017/s153929960002219x.
Повний текст джерелаАнотація:
AbstractSpace astrometry now permits accurate determinations of stellar radial motion, without using spectroscopy. Although the feasibility of deducing astrometric radial velocities from geometric projection effects was realized already by Schlesinger (1917), only with Hipparcos has it become practical. Such a program has now been carried out for the moving clusters of Ursa Major, Hyades, and Coma Berenices. Realized inaccuracies reach about 300 m/s (Dravins et al. 1997).Discrepancies between astrometric and spectroscopic radial velocities reveal effects (other than stellar motion) that affect wavelength positions of spectral lines. Such are caused by stellar surface convection, and by gravitational redshifts. A parallel program (Gullberg & Dravins 1997) is analyzing high-precision spectroscopic radial velocities for different spectral lines in these stars, using the ELODIE radial-velocity instrument atHaute-Provence.
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Безверхний, А. И., О. В. Коплак, Р. А. Валеев, Д. В. Королев, В. П. Пискорский та Р. Б. Моргунов. "Влияние текстуры на ширину доменов в спеченных магнитах (PrDy)(FeCo)B и (NdDy)(FeCo)B". Физика твердого тела 61, № 11 (2019): 2084. http://dx.doi.org/10.21883/ftt.2019.11.48411.523.
Повний текст джерелаАнотація:
AbstractWe analyzed magnetic force microscopy images of the surface of samples cut parallel and perpendicular to the texture created by applying a field in the process of pressing a magnet. The distribution of the linear size (width) of the domains correlates with the distribution of the projection area of grains onto the shear plane in sintered (PrDy)(FeCo)B magnets with radial magnetization and in prismatic (NdDy)(FeCo)B magnets. The effects of grain size and direction of the axes of easy magnetization of grains on the width of the domains, as the main factors controlling the domain structure, are discussed.
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Nonino, C., S. Del Giudice, and S. Savino. "Temperature-Dependent Viscosity and Viscous Dissipation Effects in Simultaneously Developing Flows in Microchannels With Convective Boundary Conditions." Journal of Heat Transfer 129, no. 9 (December 11, 2006): 1187–94. http://dx.doi.org/10.1115/1.2740306.
Повний текст джерелаАнотація:
The effects of viscous dissipation and temperature dependent viscosity in simultaneously developing laminar flows of liquids in straight microchannels are studied with reference to convective boundary conditions. Two different geometries, namely the circular tube and the parallel plate channel, are considered. Viscosity is assumed to vary with temperature according to an exponential relation, while the other fluid properties are held constant. A finite element procedure, based on a projection algorithm, is employed for the step-by-step solution of the parabolized momentum and energy equations. Axial distributions of the local overall Nusselt number and of the apparent Fanning friction factor are presented with reference to both heating and cooling conditions for two different values of the Biot number. Examples of radial temperature profiles at different axial locations and of axial distributions of centerline velocity and temperature are also shown.
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Liu, Xiaoli, Tao Liang, Sijing Wang, and Kumar Nawnit. "A Fractal Model for Characterizing Hydraulic Properties of Fractured Rock Mass under Mining Influence." Geofluids 2019 (December 20, 2019): 1–17. http://dx.doi.org/10.1155/2019/8391803.
Повний текст джерелаАнотація:
In this paper, two basic assumptions are introduced: (1) The number and length distribution of fractures in fractured rock mass are in accordance with the fractal law. (2) Fluid seepage in the fractures satisfies the cubic law. Based on these two assumptions, the fractal model of parallel seepage and radial seepage in fractured rock mass is established, and the seepage tensor of fracture network which reflects the geometric characteristics and fractal characteristics of fracture network under two kinds of seepage is derived. The influence of fracture geometry and fractal characteristics on permeability is analyzed, and the validity and accuracy of the model are verified by comparing the calculated results of the theoretical model and physical model test. The results show that the permeability coefficient K of fracture network is a function of the geometric (maximum crack length Lmax, fractured horizontal projection length L0, diameter calculation section porosity Φ, fracture strike α, and fracture angle θ) and fractal characteristics (fracture network fractal dimension Df and seepage flow fractal dimension DT). With the increase of fractal dimension Df, the permeability coefficient increases. With the increase of DT, the permeability coefficient decreases rapidly. And the larger the Df (Df>1.5), the greater the change of permeability coefficient K with DT.
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Robson, Stuart, Lindsay MacDonald, Stephen Kyle, and Mark R. Shortis. "CLOSE RANGE CALIBRATION OF LONG FOCAL LENGTH LENSES IN A CHANGING ENVIRONMENT." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5 (June 15, 2016): 115–22. http://dx.doi.org/10.5194/isprsarchives-xli-b5-115-2016.
Повний текст джерелаАнотація:
University College London is currently developing a large-scale multi-camera system for dimensional control tasks in manufacturing, including part machining, assembly and tracking, as part of the Light Controlled Factory project funded by the UK Engineering and Physical Science Research Council. In parallel, as part of the EU LUMINAR project funded by the European Association of National Metrology Institutes, refraction models of the atmosphere in factory environments are being developed with the intent of modelling and eliminating the effects of temperature and other variations. The accuracy requirements for both projects are extremely demanding, so accordingly improvements in the modelling of both camera imaging and the measurement environment are essential. At the junction of these two projects lies close range camera calibration. The accurate and reliable calibration of cameras across a realistic range of atmospheric conditions in the factory environment is vital in order to eliminate systematic errors. This paper demonstrates the challenge of experimentally isolating environmental effects at the level of a few tens of microns. Longer lines of sight promote the use and calibration of a near perfect perspective projection from a Kern 75mm lens with maximum radial distortion of the order of 0.5m. Coordination of a reference target array, representing a manufactured part, is achieved to better than 0.1mm at a standoff of 8m. More widely, results contribute to better sensor understanding, improved mathematical modelling of factory environments and more reliable coordination of targets to 0.1mm and better over large volumes.
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Robson, Stuart, Lindsay MacDonald, Stephen Kyle, and Mark R. Shortis. "CLOSE RANGE CALIBRATION OF LONG FOCAL LENGTH LENSES IN A CHANGING ENVIRONMENT." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5 (June 15, 2016): 115–22. http://dx.doi.org/10.5194/isprs-archives-xli-b5-115-2016.
Повний текст джерелаАнотація:
University College London is currently developing a large-scale multi-camera system for dimensional control tasks in manufacturing, including part machining, assembly and tracking, as part of the Light Controlled Factory project funded by the UK Engineering and Physical Science Research Council. In parallel, as part of the EU LUMINAR project funded by the European Association of National Metrology Institutes, refraction models of the atmosphere in factory environments are being developed with the intent of modelling and eliminating the effects of temperature and other variations. The accuracy requirements for both projects are extremely demanding, so accordingly improvements in the modelling of both camera imaging and the measurement environment are essential. At the junction of these two projects lies close range camera calibration. The accurate and reliable calibration of cameras across a realistic range of atmospheric conditions in the factory environment is vital in order to eliminate systematic errors. This paper demonstrates the challenge of experimentally isolating environmental effects at the level of a few tens of microns. Longer lines of sight promote the use and calibration of a near perfect perspective projection from a Kern 75mm lens with maximum radial distortion of the order of 0.5m. Coordination of a reference target array, representing a manufactured part, is achieved to better than 0.1mm at a standoff of 8m. More widely, results contribute to better sensor understanding, improved mathematical modelling of factory environments and more reliable coordination of targets to 0.1mm and better over large volumes.
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Damen, Frederick W., David T. Newton, Guang Lin, and Craig J. Goergen. "Machine Learning Driven Contouring of High-Frequency Four-Dimensional Cardiac Ultrasound Data." Applied Sciences 11, no. 4 (February 13, 2021): 1690. http://dx.doi.org/10.3390/app11041690.
Повний текст джерелаАнотація:
Automatic boundary detection of 4D ultrasound (4DUS) cardiac data is a promising yet challenging application at the intersection of machine learning and medicine. Using recently developed murine 4DUS cardiac imaging data, we demonstrate here a set of three machine learning models that predict left ventricular wall kinematics along both the endo- and epi-cardial boundaries. Each model is fundamentally built on three key features: (1) the projection of raw US data to a lower dimensional subspace, (2) a smoothing spline basis across time, and (3) a strategic parameterization of the left ventricular boundaries. Model 1 is constructed such that boundary predictions are based on individual short-axis images, regardless of their relative position in the ventricle. Model 2 simultaneously incorporates parallel short-axis image data into their predictions. Model 3 builds on the multi-slice approach of model 2, but assists predictions with a single ground-truth position at end-diastole. To assess the performance of each model, Monte Carlo cross validation was used to assess the performance of each model on unseen data. For predicting the radial distance of the endocardium, models 1, 2, and 3 yielded average R2 values of 0.41, 0.49, and 0.71, respectively. Monte Carlo simulations of the endocardial wall showed significantly closer predictions when using model 2 versus model 1 at a rate of 48.67%, and using model 3 versus model 2 at a rate of 83.50%. These finding suggest that a machine learning approach where multi-slice data are simultaneously used as input and predictions are aided by a single user input yields the most robust performance. Subsequently, we explore the how metrics of cardiac kinematics compare between ground-truth contours and predicted boundaries. We observed negligible deviations from ground-truth when using predicted boundaries alone, except in the case of early diastolic strain rate, providing confidence for the use of such machine learning models for rapid and reliable assessments of murine cardiac function. To our knowledge, this is the first application of machine learning to murine left ventricular 4DUS data. Future work will be needed to strengthen both model performance and applicability to different cardiac disease models.
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Осипов, С. П., Х. Д. Мирзоев, С. В. Чахлов, О. С. Осипов та Е. Ю. Усачев. "Имитационная модель оценки артефактов немоноэнергетичности и рассеяния в компьютерной томографии". Дефектоскопия 7 (липень 2021): 37–51. http://dx.doi.org/10.31857/s0130308221070058.
Повний текст джерелаАнотація:
A simulation model for estimating the beam-hardening and scattering in computed tomography in the geometry of a parallel beam is proposed on the example of inhomogeneous objects with axial symmetry. The modeling algorithm consists of a block of formation of projections and a block of reconstruction of images of object cross sections based on the Abel reverse transformation. The developed algorithm is implemented as a MathCad program. The efficiency of the algorithm and program is demonstrated by the example of a multilayer ball. Estimates of the beam hardening artifacts and scattering of the simulation model are compared with experimental estimates for the radial distributions of the linear attenuation coefficient.
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Daniels, Karen, Georges Grinstein, Adam Russell, and Mason Glidden. "Properties of normalized radial visualizations." Information Visualization 11, no. 4 (April 12, 2012): 273–300. http://dx.doi.org/10.1177/1473871612439357.
Повний текст джерелаАнотація:
This paper defines a class of normalized radial visualizations (NRVs) that includes the RadViz mapping onto the two-dimensional unit disk. An NRV maps high-dimensional records into lower dimensional space, where records’ images are convex combinations of the dimensions (called dimensional anchors) laid out in two dimensions as labels on a circle and in higher dimensions on the surface of a hypersphere. As radial visualizations have evolved, conjectures have been proposed for invariants, such as lines mapping to lines, and convex sets to convex sets. Some have been informally proven for RadViz. We formally establish these properties for all NRVs and illustrate them using RadViz. An extensive theory of Parallel Coordinates has been developed elsewhere with great benefit to the visualization community. Our theory should provide similar benefits for radial visualization users. We show that an NRV is the composition of a perspective and an affine transformation. This projective transformation characterization leads to a number of properties including line, point ordering and convexity invariance. Knowledge of these properties suggests that the visual existence of structure in the data can guide a visualization researcher in further productive exploration of the data. We show the established properties hold regardless of whether or not the dimensional anchors lie on the circle or the hypersphere. These insights also suggest directions for future NRV work, such as rotational preprocessing to separate data in RadViz and NRVs for better cluster visualization.
Дисертації з теми "Radial parallel projection"
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Шоман, Ольга Вікторівна. "Геометричне моделювання променевого енергообіну між аналітично заданими поверхнями". Thesis, Київський державний технічний університет будівництва i архітектури, 1998. http://repository.kpi.kharkov.ua/handle/KhPI-Press/20364.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.01.01 - прикладна геометрія, інженерна графіка. - Київський державний технічний університет будівництва i архітектури, Україна, Київ, 1998. Дисертацію присвячено розробці геометричного методу обчислення кутових коефіціентів випромінювання (ККВ) щодо променевого енергообміну між аналітично заданими поверхнями. В методі здійснено побудову радіально-паралельних проекцій (RP-npoeкцій) поверхонь засобами комп'ютерної графіки. Кутові коефіціенти випромінювання отримано для випадків енергообміну між каналовими поверхнями. Алгоритми реалізовано у вигляді PASCAL-програм. В методі враховано наявність характерного для каналових поверхонь ефекту самозатінення. Розв'язано задачу самоопромінювання гвинтової каналової поверхні для витка. Результати дисертації знайшли впровадження в наукових дослідженнях оптичних систем передачі інформації, в розробках сучасних теплообмінників, у проектуванні установок полімеризації ізоляційного покриття дротів.Thesis for a candidate's degree by speciality 05.01.01 - applied geometry, engineering graphics. - Kyiv State Technical University of Building and Architecture, Ukraine, Kyiv, 1998. The dissertation is devoted to the creation of geometrical method for view factor definition during radiation energy exchange between surfaces presented by analytical form. In this method construction of radial parallel projections (RP-projections) of surfaces has been carried out by means of computer graphics. View factors have been obtained for cases of energy exchange between channel surfaces. Algorithms have been realized as PASCAL-programs. Typical channel surfaces effect of hiding parts of surface by itself has been taken into account in the method. The self-irradiation problem of screw channel surface has been solved for the whole turn. The results of the work have found an utility in the scientific investigations of optical systems of transmitting information, in elaborating modern thermal energy exchange devices, in the design of wire isolation polymerisation units.
Книги з теми "Radial parallel projection"
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Maniatis, Lydia M. The Bathtub Illusion. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780199794607.003.0024.
Повний текст джерелаАнотація:
As we move around a picture, the light pattern projecting from it to our eye changes. The resulting percept also changes, but the nature of these changes varies from picture to picture. The contents of the picture may appear to remain parallel to the picture plane as it slants away from us, or they may undergo changes in their apparent shape and/or their orientation relative to the picture plane. The changes are a function of the geometry of the retinal projection competing with parallax cues to flatness. Here, a bathtub in a photo undergoes a radical shape change—from long and skinny to short and stubby—as we change our viewpoint.
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VanCour, Shawn. Making Radio Music. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190497118.003.0004.
Повний текст джерелаАнотація:
This chapter focuses on miking methods, mixing strategies, and performance styles developed by studio workers and on-air talent for making radio music. These strategies were governed by five principles: (1) acoustic plasticity (manipulating reverberation to simulate different acoustic environments); (2) sonic restraint (eschewing forceful concert-hall projections in favor of more subdued, microphone-appropriate performance styles); (3) flattening of curves (compression of dynamic range, yielding a uniformly close-up sound); (4) sonic parsimony (reduction of sonic inputs to maintain clarity of reproduction); and (5) intelligibility (rejecting fidelity to real-world spatial relationships in favor of a clear and evenly balanced sound). Embraced for broadcasting during the early and middle years of the 1920s, these principles helped to professionalize and legitimize radio’s emerging forms of soundwork and would also inform parallel strategies pursued in recording studios and Hollywood soundstages, facilitating broader shifts in period sound culture.
Тези доповідей конференцій з теми "Radial parallel projection"
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Gan, Dongming, Jian S. Dai, Jorge Dias, and Lakmal D. Seneviratne. "Controllable Rotation Workspace of a Metamorphic Parallel Mechanism With Reconfigurable Universal Joints." In 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/detc2013-12462.
Повний текст джерелаАнотація:
This paper introduces a metamorphic parallel mechanism which has three topologies with pure translational, pure rotational and 3T1R degrees of freedom. Mobility change stemming from the reconfigurability of a reconfigurable Hooke (rT) joint is illustrated by change of the limb twist screw systems and the platform constraint screw system. Then the paper focuses on the pure rotational topology of the mechanism of which the rotational center can be altered along the central line perpendicular to the base plane by altering the radial rotational axes in the limbs. Singularity analysis is conducted based on the dependency of constraint forces and actuation forces in a screw based Jacobian matrix. Following these, rotation workspace variation is demonstrated in a 2D projection format using the Tilt-and-Torsion Euler angles based on the actuation limits and joint rotation ranges.
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Abdo, Jamil, and Elhanafi Shamseldin. "Modeling of Contact Area, Contact Force, and Contact Stiffness of Mechanical Systems With Friction." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82980.
Повний текст джерелаАнотація:
It is well recognized that the contact stiffness, true contact area, and the contact force are among the key features in the study of friction system behavior. This paper presents the development of formulae for the mechanical component of dry-friction at the interface of two microscopic rough surfaces. Elastic deformation under the influence of the contact forces is considered. The elastic contact model formulation between interacting asperities is not assumed to occur only at asperity peaks, thus allowing the possibility of oblique contacts wherein the local contact surfaces are no longer parallel to the mean planes of the mating surfaces. It is shown that the approach enables the separation of the contact area into its normal and tangential projections and the contact force into its normal and tangential components. The mathematical model of contact is utilized to develop formulae for normal and tangential contact stiffness. The analytical method is used to estimate contact stiffness components. Contact parameter values for the sample are derived from the surface profile data taken from a 1.0-mm by 10-mm test area. The profile is measured using a Mahr profilometer. A computer program is written and used to analyze the profile data. The analysis yields the asperity density, average asperity radius, and the standard deviation for each test area.