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Journal articles on the topic 'Meridional shape'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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1

Wang, Yan, Quanlin Dong, and Yulian Zhang. "Meridional shape design and the internal flow investigation of centrifugal impeller." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 23 (2016): 4319–30. http://dx.doi.org/10.1177/0954406216667407.

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This paper describes an inverse design method for calculating the shape of meridional plane of centrifugal impeller. This design method permits the shroud and hub contours to be indirectly calculated by medial axis contour and constraint equations. The design process is computationally inexpensive and can conveniently modify the shroud and hub shapes as the design’s demand. Based on this design method, new constraint equations are used for a new shape design of meridional plane that lead to a uniform velocity distribution in the inlet of impeller. Numerical simulations are employed to investig

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Ragen, Sarah, Kyle C. Armour, LuAnne Thompson, Andrew Shao, and David Darr. "The Role of Atlantic Basin Geometry in Meridional Overturning Circulation." Journal of Physical Oceanography 52, no. 3 (2022): 475–92. http://dx.doi.org/10.1175/jpo-d-21-0036.1.

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Abstract We present idealized simulations to explore how the shape of eastern and western continental boundaries along the Atlantic Ocean influences the Atlantic meridional overturning circulation (AMOC). We use a state-of-the art ocean–sea ice model (MOM6 and SIS2) with idealized, zonally symmetric surface forcing and a range of idealized continental configurations with a large, Pacific-like basin and a small, Atlantic-like basin. We perform simulations with five coastline geometries along the Atlantic-like basin that range from coastlines that are straight to coastlines that are shaped like

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3

Miyauchi, Sunao, Hironori Horiguchi, Jun-ichirou Fukutomi, and Akihiro Takahashi. "K-1102 Optimization of Meridional Shape Design of Pump Impeller." Proceedings of the JSME annual meeting II.01.1 (2001): 25–26. http://dx.doi.org/10.1299/jsmemecjo.ii.01.1.0_25.

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4

Chen, Xin, Linlin Cao, Peng Yan, Peng Wu, and Dazhuan Wu. "Effect of meridional shape on performance of axial-flow fan." Journal of Mechanical Science and Technology 31, no. 11 (2017): 5141–51. http://dx.doi.org/10.1007/s12206-017-1008-1.

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Talon, Suzanne, Georges Michaud, and Alain Vincent. "On meridional Circulation in Stars." Symposium - International Astronomical Union 198 (2000): 498–99. http://dx.doi.org/10.1017/s0074180900167154.

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Even though the existence of meridional currents in stars has been known for quite a long time (Eddington 1925, Vogt 1925), its exact structure as well as its influence on stellar evolution is still unclear. Some authors concentrated on finding the exact shape of meridional circulation in a rotating star, while others tried to model its effect on the chemical distribution in the interior. In all studies performed so far however, meridional circulation is considered in an asymptotic regime in which the advection of entropy by the meridional currents is supposed to balance exactly the source ter

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Miyauchi, Sunao, Hironori Horiguchi, Jun-ichirou Fukutomi, and Akihiro Takahashi. "Optimization of Meridional Flow Channel Design of Pump Impeller." International Journal of Rotating Machinery 10, no. 2 (2004): 115–19. http://dx.doi.org/10.1155/s1023621x04000120.

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The meridional flow channel design of a pump impeller affects its performance. However, since so many design parameters exist, a new design method is proposed in which a meridional and blade-to-blade flow channel is designed by the parallel use of the circulation distribution provided by the designer. Thus, an optimization method was used to design an axis-symmetrical meridional flow channel from the circulation distribution. In addition, the inverse design method proposed by Zangeneh et al. (1996) was employed to design a three-dimensional blade-to-blade flow channel from the circulation dist

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Kim, Sung, Young-Seok Choi, Kyoung-Yong Lee, and Jun-Ho Kim. "Design Optimization of Mixed-flow Pump in a Fixed Meridional Shape." International Journal of Fluid Machinery and Systems 4, no. 1 (2011): 14–24. http://dx.doi.org/10.5293/ijfms.2011.4.1.014.

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8

Kvasha, Yu A., and N. A. Zinevych. "On the effect of the meridional contour shape on the power characteristics of a centrifugal compressor wheel." Technical mechanics 2020, no. 3 (2020): 12–17. http://dx.doi.org/10.15407/itm2020.03.012.

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This work is concerned with the development of approaches to the optimal aerodynamic design of centrifugal compressor wheels, which is due to the use of centrifugal stages in compressors of modern aircraft gas turbine engines and power plants. The aim of this work is a computational study of the effect of the meridional contour shape of a centrifugal compressor wheel on its power characteristics. The basic method is a numerical simulation of 3D turbulent gas flows in centrifugal wheels on the basis of the complete averaged Navier¬–Stokes equations and a two-parameter turbulence model. The comp

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9

Lutsko, Nicholas J., and Isaac M. Held. "The Response of an Idealized Atmosphere to Orographic Forcing: Zonal versus Meridional Propagation." Journal of the Atmospheric Sciences 73, no. 9 (2016): 3701–18. http://dx.doi.org/10.1175/jas-d-16-0021.1.

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Abstract A dry atmospheric general circulation model is forced with large-scale, Gaussian orography in an attempt to isolate a regime in which the model responds linearly to orographic forcing and then to study the departures from linearity as the orography is increased in amplitude. In contrast to previous results, which emphasized the meridional propagation of orographically forced stationary waves, using the standard Held–Suarez (H–S) control climate, it is found that the linear regime is characterized by a meridionally trapped, zonally propagating wave. Meridionally trapped waves of this k

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10

Biggs, James D. "Meridional Compression of Radio Pulsar Beams." International Astronomical Union Colloquium 128 (1992): 22–25. http://dx.doi.org/10.1017/s0002731600154691.

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AbstractWe have studied the radio pulsar emission beam assuming a) a magnetic dipole field geometry and b) that the beam geometry is defined by the field lines that are not contained within the light cylinder. In general, the beam is compressed in the meridional direction. When the magnetic and rotation axes are aligned the beam is circular and as, the angle between these axes increases, the ratio of meridional to longitudinal dimension decreases monotonically to the minimum value 0.62 when the axes are orthogonal. This beam shape is thus consistent with that inferred from the study of circula

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11

Szwed, Aleksander. "Yield Criterion for Concrete Formed From the Deviatoric and Meridional Shape Functions." IOP Conference Series: Materials Science and Engineering 661 (November 20, 2019): 012048. http://dx.doi.org/10.1088/1757-899x/661/1/012048.

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12

Rüdiger, G., та I. Tuominen. "Λ-effect, Meridional Flow and the Differential Solar Rotation". International Astronomical Union Colloquium 130 (1991): 172–77. http://dx.doi.org/10.1017/s0252921100079586.

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AbstractRotation laws for the solar convection zone are produced by the Λ-effect in rotating anisotropic turbulence fields. In this paper we use the structure of the turbulence parameters introduced by Rüdiger and Kichatinov (1990), based on a simplified turbulence model. When we neglect the meridional circulation, for small inverse Rossby numbers the angular velocity isolines are spherical, while for increasing inverse Rossby number they approach more and more the helioseismologically derived shape. This simple picture becomes more complicated if the meridional circulation is allowed to act a

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13

Elger, D. F., D. M. Blackketter, R. S. Budwig, and K. H. Johansen. "The Influence of Shape on the Stresses in Model Abdominal Aortic Aneurysms." Journal of Biomechanical Engineering 118, no. 3 (1996): 326–32. http://dx.doi.org/10.1115/1.2796014.

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Presence of a small abdominal aortic aneurysm (AAA) often presents a difficult clinical dilemma—a reparative operation with its inherent risks versus monitoring the growth of the aneurysm, with the accompanying risk of rupture. The risk of rupture is conventionally believed to be a function of the AAA bulge diameter. In this work, we hypothesized that the risk of rupture depends on AAA shape. Because rupture is inevitably linked to stress, membrane theory was used to predict the stresses in the walls of an idealized AAA, using a model which was axisymmetric and fusiform, with the ends merged i

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14

Sijp, Willem P., Jonathan M. Gregory, Remi Tailleux, and Paul Spence. "The Key Role of the Western Boundary in Linking the AMOC Strength to the North–South Pressure Gradient." Journal of Physical Oceanography 42, no. 4 (2012): 628–43. http://dx.doi.org/10.1175/jpo-d-11-0113.1.

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Abstract A key idea in the study of the Atlantic meridional overturning circulation (AMOC) is that its strength is proportional to the meridional density gradient or, more precisely, to the strength of the meridional pressure gradient. A physical basis that would indicate how to estimate the relevant meridional pressure gradient locally from the density distribution in numerical ocean models to test such an idea has been lacking however. Recently, studies of ocean energetics have suggested that the AMOC is driven by the release of available potential energy (APE) into kinetic energy (KE) and t

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Buchanan-Smith, Hannah M., and David W. Heeley. "Anisotropic Axes in Orientation Perception are Not Retinotopically Mapped." Perception 22, no. 12 (1993): 1389–402. http://dx.doi.org/10.1068/p221389.

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The effect of the posture of an observer on the pattern of meridional anisotropy for orientation acuity was examined. Orientation acuity was estimated for the two principal and for one oblique axis with three bodily postures: normal vertical sitting, vertical sitting with the head rotated to 45° from vertical, and prone. The test stimuli were sine-wave gratings covering a range of two octaves of spatial frequency, thin lines, and step edges. Acuity estimates were obtained by two different psychophysical procedures: a single-interval two-alternative forced choice, and a two-interval two-alterna

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Struthers, H., G. E. Bodeker, J. Austin, et al. "An evaluation of the simulation of the edge of the Antarctic vortex by chemistry-climate models." Atmospheric Chemistry and Physics Discussions 8, no. 6 (2008): 20155–92. http://dx.doi.org/10.5194/acpd-8-20155-2008.

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Abstract. The dynamical barrier to meridional mixing at the edge of the Antarctic spring stratospheric vortex is examined. Diagnostics are presented which demonstrate the link between the shape of the meridional mixing barrier at the edge of the vortex and the meridional gradients in total column ozone across the vortex edge. Results derived from reanalysis and measurement data sets are compared with equivalent diagnostics from five coupled chemistry-climate models to test how well the models capture the interaction between the dynamical structure of the stratospheric vortex and the chemical p

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17

Zangeneh, M. "Inviscid-Viscous Interaction Method for Three-Dimensional Inverse Design of Centrifugal Impellers." Journal of Turbomachinery 116, no. 2 (1994): 280–90. http://dx.doi.org/10.1115/1.2928362.

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A three-dimensional design method for the design of the blade geometry of centrifugal compressor impellers is presented. In this method the blade shape is computed for a specified circulation distribution, normal (or tangential) thickness distribution, and meridional geometry. As the blade shapes are computed by using an inviscid slip (or flow tangency) condition, the viscous effects are introduced indirectly by using a viscous/inviscid procedure. The three-dimensional Navier–Stokes solver developed by Dawes is used as the viscous method. Two different approaches are described for incorporatin

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18

VANLAERE, W., G. LAGAE, R. VAN IMPE, J. BELIS, and D. DELINCÉ. "EARLY YIELDING OF LIQUID-FILLED CONICAL SHELLS." International Journal of Modern Physics B 22, no. 31n32 (2008): 6224–29. http://dx.doi.org/10.1142/s0217979208051832.

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In liquid-filled conical shells, the combination of compressive meridional stresses and tensile hoop stresses can lead to instability. The present design rule for these structures is verified in this contribution by means of numerical simulations. Large axisymmetric imperfections are detrimental and may lead to failure by plastic buckling. For these shapes the design rule may be unconservative. The realism of the proposed shape deviations is questioned. However, partially or completely axisymmetric weld depressions can't be excluded from the simulations. This means that an elaborated study is

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19

Martelli, F., and V. Michelassi. "Using Viscous Calculations in Pump Design." Journal of Fluids Engineering 112, no. 3 (1990): 272–80. http://dx.doi.org/10.1115/1.2909400.

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A viscous computer code for designing the meridional channels of high-performance pumps is presented. An averaging technique is used to reduce the three-dimensional flow to a two-dimensional model. The code, based upon an implicit finite difference method for steady two-dimensional incompressible flows, was validated in complex flow geometries prior to application in the design analysis of an actual pump. Viscous effects are taken into account by two different turbulence models. The Navier-Stokes solver is used in conjunction with a standard blade-to-blade calculation by means of an automatic

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20

Bing, Hao, Shuliang Cao, Lei Tan, and Baoshan Zhu. "Effects of meridional flow passage shape on hydraulic performance of mixed-flow pump impellers." Chinese Journal of Mechanical Engineering 26, no. 3 (2013): 469–75. http://dx.doi.org/10.3901/cjme.2013.03.469.

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21

Pei, Ji, Wenjie Wang, and Shouqi Yuan. "Multi-point optimization on meridional shape of a centrifugal pump impeller for performance improvement." Journal of Mechanical Science and Technology 30, no. 11 (2016): 4949–60. http://dx.doi.org/10.1007/s12206-016-1015-7.

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22

Hoang, Thi Hong Minh, Viet Anh Truong, Ujjwal Shrestha, and Young-Do Choi. "Optimization of the Meridional Plane Shape Design Parameters in a Screw Centrifugal Pump Impeller." KSFM Journal of Fluid Machinery 24, no. 4 (2021): 15–25. http://dx.doi.org/10.5293/kfma.2021.24.4.015.

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23

Sime, Louise C., David P. Stevens, Karen J. Heywood, and Kevin I. C. Oliver. "A Decomposition of the Atlantic Meridional Overturning." Journal of Physical Oceanography 36, no. 12 (2006): 2253–70. http://dx.doi.org/10.1175/jpo2974.1.

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Abstract A decomposition of meridional overturning circulation (MOC) cells into geostrophic vertical shears, Ekman, and bottom pressure–dependent (or external mode) circulation components is presented. The decomposition requires the following information: 1) a density profile wherever bathymetry changes to construct the vertical shears component, 2) the zonal-mean zonal wind stress for the Ekman component, and 3) the mean depth-independent velocity information over each isobath to construct the external mode. The decomposition is applied to the third-generation Hadley Centre Coupled Ocean–Atmo

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24

Kim, Sung, Yong-In Kim, Jin-Hyuk Kim, and Young-Seok Choi. "Three-objective optimization of a mixed-flow pump impeller for improved suction performance and efficiency." Advances in Mechanical Engineering 11, no. 12 (2019): 168781401989896. http://dx.doi.org/10.1177/1687814019898969.

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In this article, design optimization was carried out to improve the suction performance and efficiency of a mixed-flow pump impeller. Commercial computational fluid dynamics code and a response surface method were used in the optimization to design a mixed-flow pump impeller. When it comes to a mixed-flow pump, the two main research objectives namely efficiency and suction performance tend to contradict. It is very important that the design technology improves the suction performance while maintaining high efficiency. Meridional plane and vane plane development variables were defined in the de

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Waterman, Stephanie, and Brian J. Hoskins. "Eddy Shape, Orientation, Propagation, and Mean Flow Feedback in Western Boundary Current Jets." Journal of Physical Oceanography 43, no. 8 (2013): 1666–90. http://dx.doi.org/10.1175/jpo-d-12-0152.1.

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Abstract This manuscript revisits a study of eddy–mean flow interactions in an idealized model of a western boundary current extension jet using properties of the horizontal velocity correlation tensor to diagnose characteristics of average eddy shape, orientation, propagation, and mean flow feedback. These eddy characteristics are then used to provide a new description of the eddy–mean flow interactions observed in terms of different ingredients of the eddy motion. The diagnostics show patterns in average eddy shape, orientation, and propagation that are consistent with the signatures of jet

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Pimm, A. J., S. D. Garvey, and R. J. Drew. "Shape and cost analysis of pressurized fabric structures for subsea compressed air energy storage." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 5 (2011): 1027–43. http://dx.doi.org/10.1177/0954406211399506.

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In this article, three different methods are presented for finding the deformed shape of pressurized fabric structures underwater. The methods are used here to analyse the shape and cost of ‘energy bags’, inflatable bags that can be anchored to the seabed and used for subsea compressed air energy storage. First, a system of coupled ordinary differential equations is derived which can be solved to find the shape of an inextensible axisymmetric membrane. Then finite-element analysis (FEA) of an axisymmetric natural shape bag is carried out using cable elements, giving the deformed shape of an ex

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Lu, Yeming, Xiaofang Wang, and Rong Xie. "Derivation of the Mathematical Approach to the Radial Pump’s Meridional Channel Design Based on the Controlment of the Medial Axis." Mathematical Problems in Engineering 2017 (2017): 1–15. http://dx.doi.org/10.1155/2017/7027016.

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The meridional channel is the base for designing the radial pumps, and a new design approach is proposed here. Different from the previous studies, research here tries to establish the design model simply controlled with the radial coordinate. With the combination of a series of mathematical equations, the new design approach can shape the meridional contours directly by using the initial design variables. As for the mathematical constraint in the new design approach, it was presented in two forms, and each form had its corresponding solution. For the first form (Constraint I), the midpoints o

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Guo, Ming, and Young-Do Choi. "Optimum Design on the Meridional Shape of a Multistage Centrifugal Pump Impeller for Performance Improvement." KSFM Journal of Fluid Machinery 22, no. 3 (2019): 41–48. http://dx.doi.org/10.5293/kfma.2019.22.3.041.

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29

Hayashi, Yuki, and Kaoru Sato. "Formation of Two-Dimensional Circulation in Response to Unsteady Wave Forcing in the Middle Atmosphere." Journal of the Atmospheric Sciences 75, no. 1 (2018): 125–42. http://dx.doi.org/10.1175/jas-d-16-0374.1.

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In previous studies, a steady-state assumption has been frequently used for the analysis of wave-induced meridional circulation. In general, however, the wave forcing is not constant and thus induced circulation can vary in time. Thus, to understand such transient behaviors, time evolutions of a slow variable describing balanced flows and two fast variables describing gravity waves and flows that are slaved to balanced flows are investigated. A Boussinesq equation system is used to examine zonal-mean flow responses to unsteady zonally uniform forcing. Green’s function is used to analytically o

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30

Meunier, N., and A. M. Lagrange. "Radial-velocity variations due to meridional flows in the Sun and solar-type stars: impact on exoplanet detectability." Astronomy & Astrophysics 638 (June 2020): A54. http://dx.doi.org/10.1051/0004-6361/201937354.

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Context. Stellar variability due to magnetic activity and flows at different spatial scales strongly impacts radial velocities. This variability is seen as oscillations, granulation, supergranulation, and meridional flows. The effect of this latter process is currently poorly known but could affect exoplanet detectability. Aims. We aim to quantify the amplitude of the meridional flow integrated over the disc and its temporal variability, first for the Sun, as seen with different inclinations, and then for other solar-type stars. We then want to compare these amplitudes with low-mass exoplaneta

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31

Bouras, B., F. Karagiannis, P. Chaviaropoulos, and K. D. Papailiou. "Arbitrary Blade Section Design Based on Viscous Considerations. Blade Optimization." Journal of Fluids Engineering 118, no. 2 (1996): 364–69. http://dx.doi.org/10.1115/1.2817387.

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A blade design and optimization procedure is presented in this work, which is based on viscous flow considerations. This procedure concerns the design of optimum rotating arbitrary compressible high subsonic compressor and turbine blade shapes. It takes into account the effects of wall curvature and Coriolis force on turbulence, while it allows the variation of stream surface radius, along which the blade shape is placed, as well as streamtube width, with meridional distance. In order to establish the inverse part of the viscous optimization procedure, aspects such as laminar stability, transi

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32

Taubenschuss, U., N. V. Erkaev, H. K. Biernat, C. J. Farrugia, C. Möstl, and U. V. Amerstorfer. "The role of magnetic handedness in magnetic cloud propagation." Annales Geophysicae 28, no. 5 (2010): 1075–100. http://dx.doi.org/10.5194/angeo-28-1075-2010.

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Abstract. We investigate the propagation of magnetic clouds (MCs) through the inner heliosphere using 2.5-D ideal magnetohydrodynamic (MHD) simulations. A numerical solution is obtained on a spherical grid, either in a meridional plane or in an equatorial plane, by using a Roe-type approximate Riemann solver in the frame of a finite volume approach. The structured background solar wind is simulated for a solar activity minimum phase. In the frame of MC propagation, special emphasis is placed on the role of the initial magnetic handedness of the MC's force-free magnetic field because this param

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Zarutskii, V. A., A. S. Pal’chevskii, and V. F. Sivak. "Influence of meridional shape on natural frequencies and the forms of oscillations of shells of rotation." International Applied Mechanics 33, no. 1 (1997): 53–54. http://dx.doi.org/10.1007/bf02700887.

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Adames, Ángel F., and John M. Wallace. "Three-Dimensional Structure and Evolution of the Vertical Velocity and Divergence Fields in the MJO." Journal of the Atmospheric Sciences 71, no. 12 (2014): 4661–81. http://dx.doi.org/10.1175/jas-d-14-0091.1.

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Abstract The features in the planetary-scale wind field that shape the MJO-related vertical velocity field are examined using the linear analysis protocol based on the daily global velocity potential field described in a companion paper, augmented by a compositing procedure that yields a more robust and concise description of the prevalent patterns over the Indo-Pacific warm pool sector (60°E–180°). The analysis elucidates the structural elements of the planetary-scale wind field that give rise to the characteristic “swallowtail” shape of the region of enhanced rainfall and the “bottom up” evo

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Jahn, Ingo, and Peter Jacobs. "Using Meridional Streamline and Passage Shapes to Generate Radial Turbomachinery Geometry and Meshes." Applied Mechanics and Materials 846 (July 2016): 1–6. http://dx.doi.org/10.4028/www.scientific.net/amm.846.1.

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An important aspect for structural and aerodynamics design of radial flow turbomachinery is the definition of the geometry and the generation of meshes for computational analysis. Particularly in the area of computational design and optimization, the way the geometry is defined is important, as it can limit design space. Traditionally, radial compressors and radial turbine rotors are defined using a mechanical design approach. Effectively a hub and shroud profile, followed by a rotorblade geometry are defined and the shape is adjusted in order to meet certain aerodynamic boundary conditions. T

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Han, Ying, and Boualem Khouider. "Convectively Coupled Waves in a Sheared Environment." Journal of the Atmospheric Sciences 67, no. 9 (2010): 2913–42. http://dx.doi.org/10.1175/2010jas3335.1.

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Abstract A linear stability analysis, about a radiative–convective equilibrium in a sheared environment, on an equatorial beta plane, for a simple multicloud model for organized tropical convection is presented here. Both vertical/baroclinic and meridional/barotropic zonal wind shears are considered separately in a parameter regime for which the shear-free multicloud model exhibits synoptic-scale instability of Kelvin and n = 0 eastward inertio-gravity [eastward mixed Rossby–gravity (MRG)] waves only, with moderate growth rates. The maximum growth rates appear to increase significantly with th

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Green, Ronald. "On: “Euler’s differential equation and the identification of the magnetic point‐pole and point‐dipole sources” by J. O. Barongo (GEOPHYSICS, 49, 1549–1553, September 1984)." GEOPHYSICS 52, no. 7 (1987): 1013–14. http://dx.doi.org/10.1190/1.1442353.

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In the article by Barongo, the problem of distinguishing between the anomaly patterns arising from an isolated pole and a point dipole was examined. The method the author recommended concentrated on a detailed analysis of the shape of the principal meridional profile. I suggest that a better method is to use the isogam map, rather than the profile. From the relevant expressions for contour maps of an isolated pole and a point dipole, the salient differences between the two cases become apparent.

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Balan Sarojini, B., J. M. Gregory, R. Tailleux, et al. "High frequency variability of the Atlantic meridional overturning circulation." Ocean Science 7, no. 4 (2011): 471–86. http://dx.doi.org/10.5194/os-7-471-2011.

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Abstract. We compare the variability of the Atlantic meridional overturning circulation (AMOC) as simulated by the coupled climate models of the RAPID project, which cover a wide range of resolution and complexity, and observed by the RAPID/MOCHA array at about 26° N. We analyse variability on a range of timescales, from five-daily to interannual. In models of all resolutions there is substantial variability on timescales of a few days; in most AOGCMs the amplitude of the variability is of somewhat larger magnitude than that observed by the RAPID array, while the time-mean is within about 10 %

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Hosotani, Takuji, Toru Shigemitsu, Yuki Kawaguchi, Takuya Inamoto, Takeru Ishiguro, and Ding Nan. "Influence of meridional plane shape on performance and internal flow of high head contra-rotating small hydroturbine." Journal of Physics: Conference Series 1909, no. 1 (2021): 012044. http://dx.doi.org/10.1088/1742-6596/1909/1/012044.

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Tzou, H. S., W. K. Chai, and D. W. Wang. "Micro-Control Actions and Location Sensitivity of Actuator Patches Laminated on Toroidal Shells." Journal of Vibration and Acoustics 126, no. 2 (2004): 284–97. http://dx.doi.org/10.1115/1.1687398.

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Toroidal shell structures have been proposed for components of inflatable telescopes and space structures, etc. over the years. Thus, distributed control of toroidal shells becomes a critical issue in precision maneuver, operation, and reliability. The converse effect of piezoelectric materials has made it one of the best candidates for distributed actuators. The resultant control forces and micro-control actions induced by the distributed actuators depend on applied voltages, geometrical (e.g., spatial segmentation and shape) and material (i.e., various actuator materials) properties of the a

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Tevelev, Al V., I. A. Prudnikov, Ark V. Tevelev, A. O. Khotylev, and E. A. Volodina. "KINEMATICAL MODEL FOR FORMING THE SIMEAN LOW OF THE URALIAN FORELAND BASIN." Moscow University Bulletin. Series 4. Geology, no. 2 (April 28, 2018): 23–32. http://dx.doi.org/10.33623/0579-9406-2018-2-23-32.

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In this work we reported the structural features and mechanism of the formation of the Simskaya low of the Uralian foreland basin, besides the Karatau-Suleyman block as a whole. This block has the shape of a wedge, so with a general latitudinal compression, it experienced lateral extrusion to the north along the conjugated shear zones. This factor determined the local situation of meridional compression and latitudinal tension. In the central part of the block, the latitudinal stretching was compensated for by gradual deflection, which led to the formation of the Simskaya low.

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Talon, Suzanne, and Corinne Charbonnel. "Meridional Circulation, Turbulence and Lithium in Sub-Giants Originating from the Hot Side of the Dip." Symposium - International Astronomical Union 198 (2000): 516–17. http://dx.doi.org/10.1017/s0074180900167245.

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We present the impact of meridional circulation and shear turbulence on the evolution of the lithium abundance at the surface of evolved stars originating from the hot side of the Li Dip. We show that our fully consistent treatment of the same hydrodynamical processes which can account for C and N anomalies in B type stars (Talon et al. 1997) and for the shape of the hot side of the Li dip in open clusters (Talon & Charbonnel 1998) also explains Li observations in stars with Teff higher than 7000K on the main sequence as well as in their evolved counterparts (see also Charbonnel & Talo

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Lim, Hyungsoo, Jeongmin Seo, Mooryong Park, et al. "A Numerical Study on Blade Design and Optimization of a Helium Expander for a Hydrogen Liquefaction Plant." Applied Sciences 12, no. 3 (2022): 1411. http://dx.doi.org/10.3390/app12031411.

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A design process for cryogenic expanders that supplies 0.5 TPD of liquefied hydrogen in hydrogen liquefaction plants is introduced. To improve the efficiency of the expander, the optimum design was conducted by adjusting two rotor shape parameters. The designed expander for hydrogen liquefaction has a target rotation speed of 75,000 rpm, and helium is applied as the working fluid. Since the operating temperature of the expander is as low as 49 K, a design that reflects the real gas properties must be considered. For a high-efficiency hydrogen liquefaction plant, increasing the expander efficie

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Pacileo, Giuseppe, Carlo Pisacane, Giovanna M. Russo, Roberto M. Di Donato, Carlo Vosa, and Raffaele Calabrò. "Left ventricular mechanics after early successful repair of aortic coarctation." Cardiology in the Young 5, no. 4 (1995): 310–18. http://dx.doi.org/10.1017/s1047951100002766.

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SummaryA successful aortic coarctectomy performed beyond early infancy is followed, even in the long term, by persistence of left ventricular hypertrophy and by diastolic dysfunction, although systolic function is often increased. In this study we investigated whether earlier coarctectomy provides better preservation of left ventricular function. Experimental studies on the myocardial response to pressure overload show that neonates and young infants develop a functionally advantageous combination of myocytic hyperplasia (together with mild hypertrophy) and increased angiogenesis. Older patien

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Lebed, Evgeny V. "Influence of the height of the ribbed-ring dome on the stress state of its frame during the overhang mounting process." Structural Mechanics of Engineering Constructions and Buildings 16, no. 6 (2020): 452–64. http://dx.doi.org/10.22363/1815-5235-2020-16-6-452-464.

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The aim of the research. To analyze the stress state of structures of ribbed-ring domes of different heights during overhang erection. The domes have spherical metal frames and a support contour of the same diameter. Due to different heights, the steepness of the geometric shape of the domes changes. The study is devoted to establishing the relationship between the stress state of the frame and the steepness of the dome when mounted. It was investigated how the height of the ribbed-ring dome affects the stress state of its frame during overhang mounting process. Methods. Computer models of des

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Nguyen, Hien Nho Gia, Olivier Millet, and Gérard Gagneux. "Exact calculation of axisymmetric capillary bridge properties between two unequal-sized spherical particles." Mathematics and Mechanics of Solids 24, no. 9 (2018): 2767–84. http://dx.doi.org/10.1177/1081286518787842.

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A calculation method for the meridional profile of axisymmetric bridges between two spheres of different size is introduced in this manuscript. From geometrical data of the capillary bridge, such as the neck radius and boundary conditions (filling and contact angle), the shape of the capillary bridge is calculated analytically as a solution of the Young–Laplace equation. Its free surfaces, of constant mean curvature, may be classified into portions of nodoid, unduloid, and other limit cases. Moreover, other properties of the liquid bridge can be computed analytically, such as the associated ca

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Kostornoi, A. S., P. Yu Tkach, O. O. Bondariev, and N. N. Podopryhora. "Design of impeller blades in the intermediate stage of centrifugal pump to a preset shape of meridional flow pattern." Journal of Physics: Conference Series 1741 (January 2021): 012005. http://dx.doi.org/10.1088/1742-6596/1741/1/012005.

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Mojaddam, Mohammad, and Keith Pullen. "Optimization of a Centrifugal Compressor Using the Design of Experiment Technique." Applied Sciences 9, no. 2 (2019): 291. http://dx.doi.org/10.3390/app9020291.

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Centrifugal compressor performance is affected by many parameters, optimization of which can lead to superior designs. Recognizing the most important parameters affecting performance helps to reduce the optimization process cost. Of the compressor components, the impeller plays the most important role in compressor performance, hence the design parameters affecting this component were considered. A turbocharger centrifugal compressor with vaneless diffuser was studied and the parameters investigated included meridional geometry, rotor blade angle distribution and start location of the main bla

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Struthers, H., G. E. Bodeker, J. Austin, et al. "The simulation of the Antarctic ozone hole by chemistry-climate models." Atmospheric Chemistry and Physics 9, no. 17 (2009): 6363–76. http://dx.doi.org/10.5194/acp-9-6363-2009.

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Abstract. While chemistry-climate models are able to reproduce many characteristics of the global total column ozone field and its long-term evolution, they have fared less well in simulating the commonly used diagnostic of the area of the Antarctic ozone hole i.e. the area within the 220 Dobson Unit (DU) contour. Two possible reasons for this are: (1) the underlying Global Climate Model (GCM) does not correctly simulate the size of the polar vortex, and (2) the stratospheric chemistry scheme incorporated into the GCM, and/or the model dynamics, results in systematic biases in the total column

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Greenspan, H. P., and M. Ungarish. "On the enhancement of centrifugal separation." Journal of Fluid Mechanics 157 (August 1985): 359–73. http://dx.doi.org/10.1017/s0022112085002415.

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We consider the two-phase flow of a suspension in a rotating cylinder with inclined endplates for which inertial and viscous effects are small. It is shown that, when the Coriolis force is dominant, flow in the core is essentially unaffected by geometry. If a fluid particle can make a complete circuit about the rotation axis, the sedimentation velocity cannot be augmented by geometrical effects as it can in gravitational settling. However, with the insertion of a complete meridional barrier to block movement around the centre, separation becomes more sensitive to the shape of the container wal

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