Academic literature on the topic 'Moving surfaces'

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Journal articles on the topic "Moving surfaces"

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SUN, Wei-Zhi. "Shadows of moving surfaces." Hokkaido Mathematical Journal 25, no. 2 (1996): 407–31. http://dx.doi.org/10.14492/hokmj/1351516730.

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D’Andrea, Carlos. "Resultants and Moving Surfaces." Journal of Symbolic Computation 31, no. 5 (2001): 585–602. http://dx.doi.org/10.1006/jsco.2001.0443.

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Mercier, Corentin, Thibault Lescoat, Pierre Roussillon, Tamy Boubekeur, and Jean-Marc Thiery. "Moving level-of-detail surfaces." ACM Transactions on Graphics 41, no. 4 (2022): 1–10. http://dx.doi.org/10.1145/3528223.3530151.

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We present a simple, fast, and smooth scheme to approximate Algebraic Point Set Surfaces using non-compact kernels, which is particularly suited for filtering and reconstructing point sets presenting large missing parts. Our key idea is to consider a moving level-of-detail of the input point set which is adaptive w.r.t. to the evaluation location, just such as the samples weights are output sensitive in the traditional moving least squares scheme. We also introduce an adaptive progressive octree refinement scheme, driven by the resulting implicit surface, to properly capture the modeled geometry even far away from the input samples. Similarly to typical compactly-supported approximations, our operator runs in logarithmic time while defining high quality surfaces even on challenging inputs for which only global optimizations achieve reasonable results. We demonstrate our technique on a variety of point sets featuring geometric noise as well as large holes.
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Wang, Haohao, and Ron Goldman. "Ruled Surfaces of Revolution with Moving Axes and Angles." International Journal of Computational Geometry & Applications 31, no. 02n03 (2021): 163–81. http://dx.doi.org/10.1142/s0218195921500084.

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A ruled surface of revolution with moving axes and angles is a rational tensor product surface generated from a line and a rational space curve by rotating the line (the directrix) around vectors and angles generated by the rational space curve (the director). Only right circular cylinders and right circular cones are ruled surfaces that are also surfaces of revolution, but we show that a rich collection of other ruled surfaces such as hyperboloids of one sheet, 2-fold Whitney umbrellas, and a wide variety other interesting ruled shapes are ruled surfaces of revolution with moving axes and angles. We present a fast way to compute the implicit equation of a ruled surface of revolution with moving axes and angles from two linearly independent vectors that are perpendicular to the directrix of the surface. We also provide an algorithm for determining whether or not a given rational ruled surface is a ruled surface of revolution with moving axes and angles.
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DEGANI, A. T., J. D. A. WALKER, and F. T. SMITH. "Unsteady separation past moving surfaces." Journal of Fluid Mechanics 375 (November 25, 1998): 1–38. http://dx.doi.org/10.1017/s0022112098001839.

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Unsteady boundary-layer development over moving walls in the limit of infinite Reynolds number is investigated using both the Eulerian and Lagrangian formulations. To illustrate general trends, two model problems are considered, namely the translating and rotating circular cylinder and a vortex convected in a uniform flow above an infinite flat plate. To enhance computational speed and accuracy for the Lagrangian formulation, a remeshing algorithm is developed. The calculated results show that unsteady separation is delayed with increasing wall speed and is eventually suppressed when the speed of the separation singularity approaches that of the local mainstream velocity. This suppression is also described analytically. Only ‘upstream-slipping’ separation is found to occur in the model problems. The changes in the topological features of the flow just prior to the separation that occur with increasing wall speed are discussed.
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Antes, Heinz, and Jens Baaran. "Noise radiation from moving surfaces." Engineering Analysis with Boundary Elements 25, no. 9 (2001): 725–40. http://dx.doi.org/10.1016/s0955-7997(01)00060-1.

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Kramer, Steven J. "Infant detection of moving surfaces." Infant Behavior and Development 9 (April 1986): 206. http://dx.doi.org/10.1016/s0163-6383(86)80209-0.

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Baxevani, Anastassia, Krzysztof Podgórski, and Igor Rychlik. "Velocities for moving random surfaces." Probabilistic Engineering Mechanics 18, no. 3 (2003): 251–71. http://dx.doi.org/10.1016/s0266-8920(03)00029-8.

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Gunner, M. B., and P. M. Taylor. "PLACING FABRIC ONTO MOVING SURFACES." International Journal of Clothing Science and Technology 2, no. 3 (1990): 56–64. http://dx.doi.org/10.1108/eb002967.

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Flaquer, J., G. Gárate, and M. Pargada. "Envelopes of moving quadric surfaces." Computer Aided Geometric Design 9, no. 4 (1992): 299–312. http://dx.doi.org/10.1016/0167-8396(92)90037-p.

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Dissertations / Theses on the topic "Moving surfaces"

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Wong, Yu Sang. "Temperature measurement of moving metal surfaces." access abstract and table of contents access full-text, 2006. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21456288a.pdf.

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Thesis (M.Sc.)--City University of Hong Kong, 2006.<br>"Master of Science in Materials Engineering & Nanotechnology dissertation." Title from title screen (viewed on Nov. 21, 2006) Includes bibliographical references.
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Sand, Peter (Peter M. ). 1977. "Reconstruction of deforming surfaces from moving silhouettes." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/87857.

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Pergamalis, Hector. "Droplet impingement onto quiescent and moving liquid surfaces." Thesis, Imperial College London, 2002. http://hdl.handle.net/10044/1/7256.

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Korsch, Andrea [Verfasser], and Dietmar [Akademischer Betreuer] Kröner. "Weakly coupled systems of conservation laws on moving surfaces." Freiburg : Universität, 2017. http://d-nb.info/1129080226/34.

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Soloviev, Dmitri. "Signal processing for real-time inspection of moving surfaces." Thesis, De Montfort University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392010.

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Ishii, T. Koryu. "Sensing of Irregularities on Fast Moving Surfaces by Microwaves and Millimeterwaves." International Foundation for Telemetering, 1988. http://hdl.handle.net/10150/615034.

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International Telemetering Conference Proceedings / October 17-20, 1988 / Riviera Hotel, Las Vegas, Nevada<br>Fine cracks and irregularities on a fast moving conducting surface were detected by the use of microwave and millimeter wave radio responder techniques. The interrogation angle was restricted to an oblique incidence angle less than ±0.5 degree from the surface. The fast moving conducting surface was surrounded by both fast moving and stationary reflective conducting structures. Experimental methods and results from a fine crack 0.1 mm wide, 0.9 mm deep, and 25 mm long on a conducting surface travelling with a speed of 20.23 m/s and measured at 10.525 GH(z) and 73 GH(z) are presented. The reflection-type microwave radio responder consisted of a 10.525 GH(z) 50 mW Gunn diode cw transmitter, a circulator, and a horn antenna used as the interrogator. The receiver in the same responder consisted of the same horn antenna, the circulator and detector diode. The detector diode output was observed with a Norland 3106R digital memory oscilloscope. A reflex kylstron VA 250 was used as the transmitter signal source for the millimeter wave responder. There was a distinct difference between the responder output patterns with uncracked and cracked surfaces. It is therefore possible to use this type of responder for hair-line crack detection of fast moving conducting surfaces. It was also found that this type of radio responder can detect the surface irregularity even before the hairline crack actually occurs.
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Wysocki, Stefan. "Joint Euler-Lagrange method for moving surfaces in large-eddy simulation." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/10214.

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Continuous growth of computing power strongly encourages engineers to rely more on computational fluid dynamics for the design and testing of new technological solutions. The fast development of these new tools goes along with the increasing availability of high-performance computers, which are necessary to simulate realistic industrial applications. The presented immersed boundary (IB) method is applicable to simple and complex geometries with static and moving boundaries, where fluids interact with the solid structures. The formulation of the method is based on the Eulerian and Lagrangian principles and its key characteristics are its simple formulation and computational efficiency. Furthermore the nature of the method allows the simulations of flows in complex geometries without having to generate complex meshes. The spatial discretization is based on a fixed Cartesian mesh for the Eulerian variables and boundary movements are tracked with Lagrangian particles. Large- Eddy simulations of flows in simple and complex geometries demonstrate the performance of the applied immersed boundary method. Simple cases include the simulation of an isothermal pipe flow and the flow around a sphere. In the first instance, the fluid flows around a static sphere. In the second case the sphere moves relative to the grid for identical flow conditions. Simulations of complex geometries include the investigation of an isothermal and reactive opposed jet flow with perforated and fractal grids. The simulations require cell sizes near the resolution of direct numerical simulations. The injection phase of a piston-cylinder arrangement, assuming constant pressure, is also investigated with the proposed IB method. Good statistical results for first and second moments are achieved for all investigated cases, although the applied grids have to be fine enough to accurately resolve the wall shear stresses. In addition, the concept of using Lagrangian particles has been applied to immiscible flows. Particles are used to improve the accuracy of scalar transport and initial results of simple, two-dimensional test cases are presented.
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Clavijo, Angeles Cristian Esteban. "Droplet Impingement on Superhydrophobic Surfaces." BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6306.

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This dissertation explores the physics of droplet impingement on superhydrophobic surfaces. The research is divided in three categories. First, the effect of a slip boundary condition on droplet spreading/retracting is considered. A model is developed based on energy conservation to evaluate spreading rates on surfaces exhibiting isotropic and anisotropic slip. The results show that larger slip causes the droplet to spread out farther owing to reduced friction at the interface for both slip scenarios. Furthermore, effects of slip become magnified for large Weber numbers due to the larger solid-liquid contact area during the process. On surfaces with anisotropic slip, droplets adopt an elliptical shape following the azimuthal contour of the slip on the surface. It is common for liquid to penetrate into the cavities at the superhydrophobic interface following droplet impact. Once penetrated, the flow is said to be in the Wenzel state and many superhydrophobic advantages, such as self-cleaning and drag-reduction, become negated. Transition from the Wenzel to the Cassie state (liquid resides above the texture) is referred to as dewetting and is the focus of the second piece of this dissertation. Micro-pillar pitch, height and temperature play a role on dewetting dynamics. The results show that dewetting rates increase with increasing pillar height and increasing surface temperature. A scaling model is constructed to obtain an explanation for the experimental observations and suggests that increasing pillar height increasing the driving dewetting force, while increasing surface temperature decreases dissipation. The last piece of work of this dissertation entails droplet impingement on superheated surfaces (100°C - 400°C). We find that the Leidenfrost point (LFP) occurs at a lower temperature on a hydrophobic surface than a hydrophilic one, where the LFP refers to the lowest temperature at which secondary atomization ceases to occur. This behavior is attributed to the manner in which vapor bubbles grow at the solid-liquid interface. Also in this work, high-speed photographs reveal that secondary atomization can be significantly suppressed on a superhydrophobic surface owing to the micro-pillar forest which allows vapor to escape hence minimizing bubble formation within the droplet. However, a more in-depth study into different superhydrophobic texture patterns later reveals that atomization intensity can significantly increase for small pitch values given the obstruction to vapor flow presented by the increased frequency of the pillars.
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Dettmer, W. G. "Finite element modelling of fluid flow with moving free surfaces and materials." Thesis, Swansea University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636441.

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This work is concerned with the modelling of fluid flows on moving domains. The physical problems considered are free surface flows, possibly in the presence of the surface tension phenomena, fluid-rigid body and fluid-structure interaction. The fluid flow considered is governed by the incompressible Navier-Stokes equations. It is modelled by stabilised low order velocity-pressure finite elements. A detailed analysis of time integration strategies is performed leading to the choice of the discrete implicit generalised-α method for the temporal discretisation. The motion of the fluid domain is accounted for by an arbitrary Eulerian-Lagrangian (ALE) strategy. Different mesh update methods are considered. The free surface and the fluid-solid interfaces are modelled carefully, satisfying the necessary conservation properties. These computational ingredients result in fully implicit and strongly coupled sets of nonlinear equations, which are rephrased in a common general framework by decomposing the problems into the fluid, the interface and possibly the solid domains. In order to obtain the exact solution variables, a partitioned Newton-Raphson procedure, based on the exact linearization of the residuals, is developed. Thus, the strong coupling is resolved and optimal convergence can be expected. Finally, a number of two dimensional or axisymmetric numerical examples is presented which demonstrate the robustness and the efficiency of the overall algorithm. The strategy is verified against various reference solutions. The numerical examples include the simulation of the filling of drops, the stretching of liquid bridges, the vortex induced oscillations and the galloping of solid bodies.
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Atkinson, Philip A. "From detection of complex motion to descriptions of moving surfaces in human vision." Thesis, Aston University, 2004. http://publications.aston.ac.uk/14562/.

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A preliminary study by Freeman et al (1996b) has suggested that when complex patterns of motion elicit impressions of 2-dimensionality, odd-item-out detection improves given targets can be differentiated on the basis of surface properties. Their results can be accounted for, it if is supposed that observers are permitted efficient access to 3-D surface descriptions but access to 2-D motion descriptions is restricted. To test the hypothesis, a standard search technique was employed, in which targets could be discussed on the basis of slant sign. In one experiment, slant impressions were induced through the summing of deformation and translation components. In a second theory were induced through the summing of shear and translation components. Neither showed any evidence of efficient access. A third experiment explored the possibility that access to these representations may have been hindered by a lack of grouping between the stimuli. Attempts to improve grouping failed to produce convincing evidence in support of life. An alternative explanation is that complex patterns of motion are simply not processed simultaneously. Psychophysical and physiological studies have, however, suggested that multiple mechanisms selective for complex motion do exist. Using a subthreshold summation technique I found evidence supporting the notion that complex motions are processed in parallel. Furthermore, in a spatial summation experiment, coherence thresholds were measured for displays containing different numbers of complex motion patches. Consistent with the idea that complex motion processing proceeds in parallel, increases in the number of motion patches were seen to decrease thresholds, both for expansion and rotation. Moreover, the rates of decrease were higher than those typically expected from probability summation, thus implying mechanisms are available, which can pool signals from spatially distinct complex motion flows.
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Books on the topic "Moving surfaces"

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Saxena, A. K. Optical velocimetry of fast moving surfaces. Bhabha Atomic Research Centre, 2007.

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Soloviev, Dmitri. Signal processing for real-time inspection of moving surfaces. De Montfort University, 2001.

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K, Myers M., and Langley Research Center, eds. Extension of Kirchhoff's formula to radiation from moving surfaces. National Aeronautics and Space Administration, Langley Research Center, 1988.

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Farassat, F. Extension of Kirchhoff's formula to radiation from moving surfaces. Langley Research Center, 1987.

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Grinfeld, Pavel. Introduction to Tensor Analysis and the Calculus of Moving Surfaces. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7867-6.

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Laurila, Tomi. Interfacial Compatibility in Microelectronics: Moving Away from the Trial and Error Approach. Springer London, 2012.

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Farassat, F. The Kirchhoff formulas for moving surfaces in aeroacoustics: The subsonic and supersonic cases. National Aeronautics and Space Administration, Langley Research Center, 1996.

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United States. Congress. Office of Technology Assessment., ed. Moving ahead: 1991 surface transportation legislation. Congress of the U.S., Office of Technology Assessment, 1991.

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Office, General Accounting. Surface transportation: Moving into the 21st century. The Office, 1999.

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A, Ostrovskiĭ L., and Environmental Technology Laboratory (Oceanic and Atmospheric Research Laboratories), eds. Laboratory modeling and theoretical studies of surface wave modulation by a moving sphere. Environmental Technology Laboratory, U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Oceanic and Atmospheric Research Laboratories, 2002.

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Book chapters on the topic "Moving surfaces"

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Carter, J., and Masahico Saito. "Moving knotted surfaces." In Mathematical Surveys and Monographs. American Mathematical Society, 1997. http://dx.doi.org/10.1090/surv/055/02.

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Jensen, Gary R., Emilio Musso, and Lorenzo Nicolodi. "Theory of Moving Frames." In Surfaces in Classical Geometries. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27076-0_3.

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Chern, Shiing-Shen. "Minimal Surfaces by Moving Frames." In Springer Collected Works in Mathematics. Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4614-9451-5_8.

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Chern, Shiing-shen, and Jon Gordon Wolfson. "Minimal Surfaces by Moving Frames." In Selected Papers. Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4612-3548-4_8.

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Dell’Aria, Annie. "Enchantment: Encountering Moving Images on Urban Surfaces." In Experimental Film and Artists’ Moving Image. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65904-2_2.

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Escher, Joachim, and Gieri Simonett. "Moving Surfaces and Abstract Parabolic Evolution Equations." In Topics in Nonlinear Analysis. Birkhäuser Basel, 1999. http://dx.doi.org/10.1007/978-3-0348-8765-6_10.

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Mehmood, Ahmer. "Viscous Flow Due to Moving Continuous Surfaces." In Viscous Flows. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55432-7_1.

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Mehmood, Ahmer. "Turbulent Flow Due to Moving Continuous Surfaces." In Viscous Flows. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55432-7_12.

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Grinfeld, Pavel. "Applications of the Calculus of Moving Surfaces." In Introduction to Tensor Analysis and the Calculus of Moving Surfaces. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7867-6_17.

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Wang, Ruizhe, Lingyu Wei, Etienne Vouga, et al. "Capturing Dynamic Textured Surfaces of Moving Targets." In Computer Vision – ECCV 2016. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-46478-7_17.

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Conference papers on the topic "Moving surfaces"

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Sumita, Shinichirou, Hiromi Muraoka, and Sadayoshi Mikami. "Wheel Mechanism for Moving on Bumpy Surfaces Using Tensegrity Structure Including Axle Hub." In 2024 International Conference on Advanced Robotics and Intelligent Systems (ARIS). IEEE, 2024. http://dx.doi.org/10.1109/aris62416.2024.10679996.

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Chen, Kuo, Xinyan Huang, Xunjie Chen, and Jingang Yi. "Contingency Model Predictive Control for Bipedal Locomotion on Moving Surfaces with a Linear Inverted Pendulum Model." In 2024 American Control Conference (ACC). IEEE, 2024. http://dx.doi.org/10.23919/acc60939.2024.10644617.

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Sederberg, Thomas W., and Falai Chen. "Implicitization using moving curves and surfaces." In the 22nd annual conference. ACM Press, 1995. http://dx.doi.org/10.1145/218380.218460.

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Pinhanez, Claudio, Frank Nielsen, and Kim Binsted. "Projecting computer graphics on moving surfaces." In ACM SIGGRAPH 99 Conference abstracts and applications. ACM Press, 1999. http://dx.doi.org/10.1145/311625.312166.

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Morisaki, Tao, Ryoma Mori, Ryosuke Mori, et al. "Hopping-Pong: Changing Trajectory of Moving Object Using Computational Ultrasound Force." In ISS '19: Interactive Surfaces and Spaces. ACM, 2019. http://dx.doi.org/10.1145/3343055.3359701.

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Ritos, Konstantinos, Nishanth Dongari, Yonghao Zhang, and Jason M. Reese. "Dynamic Wetting on Moving Surfaces: A Molecular Dynamics Study." In ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icnmm2012-73179.

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We report molecular dynamics (MD) simulations of the dynamic wetting of nanoscale droplets on moving surfaces. The dynamic water contact angle and contact angle hysteresis are measured as a function of capillary number on smooth silicon and graphite surfaces. The hydrogen bonding and density profile variations are also reported, and the width of the water depletion layer is evaluated for droplets on three different static surfaces: silicon, graphite and a fictitious super-hydrophobic surface. Our results show that molecular displacements at the contact line are mostly influenced by interactions with the solid surface, while the viscous dissipation effects induced through the movement of surfaces are found to be negligible, especially for hydrophobic surfaces. This finding is in contrast with the wetting dynamics of macroscale droplets, which show significant dependence on the capillary number. This study may yield new insight into surface-wettability characteristics of nano droplets, in particular, developing new boundary conditions for continuum solvers for liquid flows in micro- and nanoscale devices.
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ZHANG, MING, RON GOLDMAN, and ENG WEE CHIONH. "EFFICIENT IMPLICITIZATION OF RATIONAL SURFACES BY MOVING PLANES." In Proceedings of the Fourth Asian Symposium (ASCM 2000). WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812791962_0020.

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Martinez, Aaron, Joseph Milluzzo, Scott Drayton, and Scott Davids. "Performance Measurements on Rotors Hovering above Moving Surfaces." In Vertical Flight Society 75th Annual Forum & Technology Display. The Vertical Flight Society, 2019. http://dx.doi.org/10.4050/f-0075-2019-14739.

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Hub load measurements were taken on a rotor in ground effect above a ground plane undergoing single degree-offreedom motion. A two-bladed teetering hub rotor was operated in a hovering condition at multiple heights above a sinusoidal pitching or heaving ground plane. A six-axis load cell was used to measure the load generated by a rotor at multiple blade collective pitch angles, as well as ground plane amplitudes and frequencies. The magnitude and frequency of the ground plane motion was determined based off a ratio of rotor blade passage frequency (for a representative maritime helicopter) to ground motion frequency (for a DDG-51 class ship). A distinct and measurable f luctuation on the rotor pitching moment was observed in the presence of ground plane pitching motion, and variations in thrust as high as twenty percent were observed in the presence of ground plane heaving motion. An appropriate scaling parameter for the problem was investigated and determined to be the ratio of the rotor inflow velocity to the peak ground motion velocity. This parameter showed good agreement over the complete range of measurement conditions, including when the rotor was operated at or near zero thrust.
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Zakharova, Kateryna, and Aleksander Czekanski. "3D bioprinting on moving surfaces using computer vision." In Canadian Society for Mechanical Engineering International Congress 2023. Université de Sherbrooke. Faculté de génie, 2023. http://dx.doi.org/10.17118/11143/20720.

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Oomori, Kotaro, Wataru Kawabe, Fabrice Matulic, Takeo Igarashi, and Keita Higuchi. "Interactive 3D Annotation of Objects in Moving Videos from Sparse Multi-view Frames." In ISS '23: Conference on Interactive Surfaces and Spaces. ACM, 2023. http://dx.doi.org/10.1145/3626485.3626546.

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Reports on the topic "Moving surfaces"

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Grinfeld, Pavel. A Better Calculus of Moving Surfaces. Journal of Geometry and Symmetry in Physics, 2012. http://dx.doi.org/10.7546/jgsp-26-2012-61-69.

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Ludu, Andrei. Differential Geometry of Moving Surfaces and its Relation to Solitons. GIQ, 2012. http://dx.doi.org/10.7546/giq-12-2011-43-69.

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Heron, Neil, and Sam McCormick. The Physical Demands of Wheelchair Tennis - a Systematic Review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2023. http://dx.doi.org/10.37766/inplasy2023.3.0060.

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Review question / Objective: Our aim was to describe and synthesise the physical demands of wheelchair tennis. We reviewed the data across different playing surfaces, performance levels and sex of tennis players. Eligibility criteria: Studies had to meet the criteria below to be included in the review:i. The paper reported on participants playing singles or doubles wheelchair tennis matches (all ages, performance levels, quad or open category and court surfaces).ii. The data collected was related to the duration of play (e.g. length of match, effective playing time), on-court movement characteristics (e.g. distance covered, moving speed, accelerations), stroke characteristics (e.g. first serve %, count, frequency) or physiological response to match play (e.g. heart rate, oxygen uptake, energy expenditure) of wheelchair tennis.
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Iselin, Columbus O'Donnell. Preliminary report on the prediction of "Afternoon Effect". Woods Hole Oceanographic Institution, 2022. http://dx.doi.org/10.1575/1912/29562.

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With moderate or light winds and a clear sky the diurnal heating which occurs near the sea surface can cause a serious reduction in the range of submarine detection, especially on shallow targets. This has usually been called the “afternoon effect", although as will be noticed below the ranges often remain short long after sun down. The heating of surface waters which causes such sharp downward refraction can of course be noted on a bathythermograph record, provided pen vibration does not confuse the upper part of the trace. Unfortunately it is the upper 20 or 30 feet of a bathythermograph curve which in the case of ships moving faster than 12 knots is often somewhat difficult to read with sufficient certainty. Moreover, in planning a days operations it is clearly desirable to know in advance how much reduction in range may be expected from diurnal warming.
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Wallach, Rony, Tammo Steenhuis, Ellen R. Graber, David DiCarlo, and Yves Parlange. Unstable Flow in Repellent and Sub-critically Repellent Soils: Theory and Management Implications. United States Department of Agriculture, 2012. http://dx.doi.org/10.32747/2012.7592643.bard.

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Water repellency causes unstable wetting fronts that result in water moving in preferential flowpaths through homogeneous soils as well in structured soils where macropores enhance the preferential flow pattern. Water repellency is typically associated with extended water ponding on the soil surface, but we have found that repellency is important even before the water ponds. Preferential flow fingers can form under conditions where the contact angle is less than 90o, but greater than 0o. This means that even when the soil is considered wettable (i.e., immediate penetration of water), water distribution in the soil profile can be significantly non-uniform. Our work concentrated on various aspects of this subject, with an emphasis on visualizing water and colloid flow in soil, characterizing mathematically the important processes that affect water distribution, and defining the chemical components that are important for determining contact angle. Five papers have been published to date from this research, and there are a number of papers in various stages of preparation.
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6

Chatraphorn, Patcha, and Sojiphong Chatraphorn. Simulations of thin film growth on patterned substrates. Chulalongkorn University, 2005. https://doi.org/10.58837/chula.res.2005.34.

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Patterned substrate growth is a technique that layers of thin film are grown on a substrate with a predetermined pattern. A simple model is used to study patterned growth process with two different types of pattern: flat pattern and periodic pattern. The goals are to determine growth conditions that enable the grown film to reproduce the original pattern, and to determine how much of the original patterns survive up to a specific time. The persistence probability is used to determine fractions of survived pattern. We found that in flat patterned growth, a high substrate temperature which results in a long surface diffusion length of moving atoms can help increase the persistence probability of the pattern. If the substrate temperature is high enough, the film is grown in layer-by-layer mode and the flat pattern persists for a long time. In periodic pattern growth, long surface diffusion length helps with the smoothness of the flat parts of the pattern but destroys the outline shape of the pattern. We found that the substrate temperature has to be a moderate value, not too low and not too high. The optimal value depends on the size of the pattern. A pattern with a bigger feature size can persist for a longer period of time. Finally, we suggest a modified definition of the persistence probability in order to have a probability that agrees better with the simulated morphology.
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7

Ray, Laura, Madeleine Jordan, Steven Arcone, et al. Velocity field in the McMurdo shear zone from annual ground penetrating radar imaging and crevasse matching. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42623.

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The McMurdo shear zone (MSZ) is strip of heavily crevassed ice oriented in the south-north direction and moving northward. Previous airborne surveys revealed a chaotic crevasse structure superimposed on a set of expected crevasse orientations at 45 degrees to the south-north flow (due to shear stress mechanisms). The dynamics that produced this chaotic structure are poorly understood. Our purpose is to present our field methodology and provide field data that will enable validation of models of the MSZ evolution, and here, we present a method for deriving a local velocity field from ground penetrating radar (GPR) data towards that end. Maps of near-surface crevasses were derived from two annual GPR surveys of a 28 km² region of the MSZ using Eulerian sampling. Our robot-towed and GPS navigated GPR enabled a dense survey grid, with transects of the shear zone at 50 m spacing. Each survey comprised multiple crossings of long (&gt; 1 km) crevasses that appear in echelon on the western and eastern boundaries of the shear zone, as well as two or more crossings of shorter crevasses in the more chaotic zone between the western and eastern boundaries. From these maps, we derived a local velocity field based on the year-to-year movement of the same crevasses. Our velocity field varies significantly from fields previously established using remote sensing and provides more detail than one concurrently derived from a 29-station GPS network. Rather than a simple velocity gradient expected for crevasses oriented approximately 45 degrees to flow direction, we find constant velocity contours oriented diagonally across the shear zone with a wavy fine structure. Although our survey is based on near-surface crevasses, similar crevassing found in marine ice at 160 m depth leads us to conclude that this surface velocity field may hold through the body of meteoric and marine ice. Our success with robot-towed GPR with GPS navigation suggests we may greatly increase our survey areas.
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8

Dinovitzer, Aaron. PR-214-154503-R01 Pipeline Strains Induced by Slope Movement. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011609.

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Pipeline integrity may be affected by the action of the external soil loads that can be generated by ground movements or slope failures and the structural integrity threat of these geotechnical failures is not well understood. The threat presented to a pipeline by a localized slope failure is not directly related to magnitude of the soil movement involved, but related to the stress and strains induced in the pipeline by the moving soil block. This project demonstrated and applied advanced pipe-soil interaction numerical modeling tools in the assessment of slope movements directed long the pipeline axis. The geotechnical hazard assessments completed in this project provide a conservative means of estimating the pipeline axial strain accumulation resulting from slope movements. These modeling results are presented such that an understanding of the influence of pipeline, slope and operational parameters on strain accumulation is demonstrated and the relative importance of each parameter is demonstrated. The relationship between surface expression of a geotechnical event and the subsurface parameters to facilitate conservative characterization of the event is defined. The data describing axial strain as a function of ground movement magnitude presented in this project may be compared to the axial strain capacity (resistance) engineering tools to evaluate the significance of slope movements on pipeline integrity.
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9

Loignon, Andy, Stephanie Wormington, and George Hallenbeck. Reconsidering Myths about Teamwork Using CCL’s Framework on Team Effectiveness. Center for Creative Leadership, 2022. http://dx.doi.org/10.35613/ccl.2022.2052.

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In this paper we discuss several pervasive myths and misperceptions about teams and teamwork. We also introduce an evidence-based framework for moving beyond these myths and misperceptions. We shared several statements about teamwork to over 1,300 working adults. On average, across all the myths and respondents, 62% of respondents agreed with the myths we presented, 21% were uncertain, and only 17% disagree. This suggests that over 80% of respondents either endorsed, or expressed uncertainty about, myths relating to fundamental aspects of teamwork. Given the pervasiveness and lack of clarity surrounding myths about teams, we provide a research-grounded framework to better support holistic team effectiveness while also illuminating nuances about common myths. Together, we leverage this framework and our review of the teams literature to offer four broader “truths” that leaders and organizations can keep in mind to support effective teamwork. These include: Effective teams need intentional and systemic support. Teams need to be intentionally supported with ongoing development and an appreciation of their place in broader systems. Teams simultaneously reflect “wholes” and “parts.” Although teams come together to achieve shared and collective goals, they are, fundamentally, a combination of distinct individuals. Teams are dynamic. It is best to re-evaluate where a team is at any point in time rather than assume stability. Beliefs about teams and teamwork need to be (re)surfaced. Given the pervasiveness of myths and misconceptions about teamwork, there is value in openly discussing, questioning, and challenging assumptions about how teams can be the most effective.
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Chen, Pictiaw, Boaz Zion, and Michael J. McCarthy. Utilization of NMR Technology for Internal Nondestructive Quality Evaluation of Fruits and Vegetables. United States Department of Agriculture, 1994. http://dx.doi.org/10.32747/1994.7568778.bard.

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Objective: The objective of this research was to investigate the potential use of NMR for evaluating various internal quality factors of fruits and vegetables, leading to the eventual development of practical techniques that are useful for future development of NMR sensors. Summary: Investigation on NMR imaging, one-dimension NMR projection, and single-pulse free-induction-decay (FID) spectrum led to the development of high-speed NMR techniques for real-time sensing of internal quality of selected fruits. NMR imaging can be used for detecting internal defects and various quality factors such as bruises, dry regions, worm damage, stage of ripeness, tissue breakdown, and the presence of voids, seeds, sprouts, and pits. The one-dimension (1-D) image profile technique, in which the 1-D projection of the NMR signal of a selected slice of the intact fruit is recorded, is suitable for detecting tissue breakdown regions, presence of pits, and other defects in fruits. The oil and sugar content of fruits can be determined from the single-pulse FID spectrum measurement, in which a surface coil is used to acquire the FID spectrum and the ratio of the resonance peaks is used as the quality index. The latter two techniques are suitable for high-speed sorting of fruits. The most important accomplishment is the successful development of high-speed NMR techniques for determining internal quality of fruits while they are moving at speed up to 30 cm/s. This accomplishment is an important step toward the development of NMR techniques for on-line sorting of fruits and vegetables.
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