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Artículos de revistas sobre el tema "Force polytope"

Autor: Grafiati
Publicado: 25 de enero de 2025
Última modificación: 31 de julio de 2025

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1

Wei, Baochen, and Feng Gao. "Output force capacity polytope approach for actuator forces selection of three degrees of freedom excavating manipulator." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 11 (2013): 2007–17. http://dx.doi.org/10.1177/0954406213512629.

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Output force or velocity polytopes are usually used as an index of the manipulability of robot. This paper discusses the relationship between the actuator force and the variation of the output force capacity polytope and proposes the output force capacity polytope method for the selection of actuator forces of a three degrees of freedom excavating manipulator with the requirement that the output force on the end effector is a set of all possible forces rather than a single force. In this paper, the method to calculate capacity polytope is introduced with the consideration of gravity effect. Wi
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2

Rezzoug, Nasser, Vincent Hernandez, and Philippe Gorce. "Upper-Limb Isometric Force Feasible Set: Evaluation of Joint Torque-Based Models." Biomechanics 1, no. 1 (2021): 102–17. http://dx.doi.org/10.3390/biomechanics1010008.

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A force capacity evaluation for a given posture may provide better understanding of human motor abilities for applications in sport sciences, rehabilitation and ergonomics. From data on posture and maximum isometric joint torques, the upper-limb force feasible set of the hand was predicted by four models called force ellipsoid, scaled force ellipsoid, force polytope and scaled force polytope, which were compared with a measured force polytope. The volume, shape and force prediction errors were assessed. The scaled ellipsoid underestimated the maximal mean force, and the scaled polytope overest
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3

Peña Fernández, César A. "Control of Flexible Manipulator Robots Based on Dynamic Confined Space of Velocities: Dynamic Programming Approach." Journal of Robotics and Control (JRC) 3, no. 6 (2022): 743–53. http://dx.doi.org/10.18196/jrc.v3i6.16454.

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Linear Parameter Varying models-based Model Predictive Control (LPV-MPC) has stood out in manipulator robots because it presents well-rejection to dynamic uncertainties in flexible joints. However, it has become too weak when the MPC's optimization problem does not include kinematic constraints-based conditions. This paper uses dynamic confined space of velocities (DCSV) to include these conditions as a recursive polytopic constraint, guaranteeing optimal dependency on a simplex scheduling parameter. To this end, the local frame's velocities and torque/force preload of joints (related to viola
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4

Chiacchio, Pasquale, Yann Bouffard-Vercelli, and Fran�ois Pierrot. "Force polytope and force ellipsoid for redundant manipulators." Journal of Robotic Systems 14, no. 8 (1997): 613–20. http://dx.doi.org/10.1002/(sici)1097-4563(199708)14:8<613::aid-rob3>3.0.co;2-p.

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5

Ferrolho, Henrique, Wolfgang Merkt, Carlo Tiseo, and Sethu Vijayakumar. "Residual force polytope: Admissible task-space forces of dynamic trajectories." Robotics and Autonomous Systems 142 (August 2021): 103814. http://dx.doi.org/10.1016/j.robot.2021.103814.

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6

Firmani, Flavio, Alp Zibil, Scott B. Nokleby, and Ron P. Podhorodeski. "Wrench capabilities of planar parallel manipulators. Part II: Redundancy and wrench workspace analysis." Robotica 26, no. 6 (2008): 803–15. http://dx.doi.org/10.1017/s0263574708004396.

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SUMMARYThis part of the paper investigates the wrench capabilities of redundantly actuated planar parallel manipulators (PPMs). The wrench capabilities of PPMs are determined by mapping a hypercube from the torque space into a polytope in the wrench space. For redundant PPMs, one actuator output capability constrains the wrench space with a smaller polytope that is contained inside the overall polytope. Performance indices are derived from six study cases. These indices are employed to analyze the wrench workspace for constant orientation of the mobile platform of the non-redundant 3-RRR PPM,
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7

Andrews, Lawrence C., and Herbert J. Bernstein. "The geometry of Niggli reduction:BGAOL–embedding Niggli reduction and analysis of boundaries." Journal of Applied Crystallography 47, no. 1 (2014): 346–59. http://dx.doi.org/10.1107/s1600576713031002.

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Niggli reduction can be viewed as a series of operations in a six-dimensional space derived from the metric tensor. An implicit embedding of the space of Niggli-reduced cells in a higher-dimensional space to facilitate calculation of distances between cells is described. This distance metric is used to create a program,BGAOL, for Bravais lattice determination. Results fromBGAOLare compared with results from other metric based Bravais lattice determination algorithms. This embedding depends on understanding the boundary polytopes of the Niggli-reduced coneNin the six-dimensional spaceG6. This a
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8

Krengel, D., J. Chen, Z. Yu, H. G. Matuttis, and T. Matsushima. "Implementing van der Waals forces for polytope DEM particles." IOP Conference Series: Earth and Environmental Science 1480, no. 1 (2025): 012030. https://doi.org/10.1088/1755-1315/1480/1/012030.

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Abstract Clay minerals are non-spherical nano-particles interacting through ranged van der Waals forces. Discrete Element Simulations usually use coarse numerical integration based on sphere clusters, as available analytical formalisms are limited. In this paper, we discuss the numerical implementation of a van der Waals force for cuboid particles derived in previous research. In particular, we describe some of the corrections necessary for its extension to pairs of finite-sized particles.
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9

Boudreau, Roger, Scott Nokleby, and Marise Gallant. "Wrench Capabilities of a Kinematically Redundant Planar Parallel Manipulator." Robotica 39, no. 9 (2021): 1601–16. http://dx.doi.org/10.1017/s0263574720001381.

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SUMMARYThis paper presents a methodology to obtain the wrench capabilities of a kinematically redundant planar parallel manipulator using a wrench polytope approach. A methodology proposed by others for non-redundant and actuation-redundant manipulators is adapted to a kinematically redundant manipulator. Four wrench capabilities are examined: a pure force analysis, the maximum force for a prescribed moment, the maximum reachable force, and the maximum moment with a prescribed force. The proposed methodology, which finds the exact explicit solution for three of the four wrench capabilities, do
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10

Okabe, Kousuke. "Translating Manipulating Force Polytope by Dynamics on Kinematical Redundant Manipulators." Journal of the Robotics Society of Japan 41, no. 3 (2023): 303–8. http://dx.doi.org/10.7210/jrsj.41.303.

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11

Zheng, Yu. "Real-time contact force distribution using a polytope hierarchy in the grasp wrench set." Robotics and Autonomous Systems 99 (January 2018): 97–109. http://dx.doi.org/10.1016/j.robot.2017.10.014.

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12

Jeong, Seonghee, and Takayuki Takahashi. "Impact Force Reduction of Manipulators Using a Dynamic Acceleration Polytope and Flexible Collision Detection Sensor." Advanced Robotics 23, no. 3 (2009): 367–83. http://dx.doi.org/10.1163/156855308x397578.

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13

Firmani, Flavio, Alp Zibil, Scott B. Nokleby, and Ron P. Podhorodeski. "Wrench capabilities of planar parallel manipulators. Part I: Wrench polytopes and performance indices." Robotica 26, no. 6 (2008): 791–802. http://dx.doi.org/10.1017/s0263574708004384.

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SUMMARYThis paper is organized in two parts. In Part I, the wrench polytope concept is presented and wrench performance indices are introduced for planar parallel manipulators (PPMs). In Part II, the concept of wrench capabilities is extended to redundant manipulators and the wrench workspace of different PPMs is analyzed. The end-effector of a PPM is subject to the interaction of forces and moments. Wrench capabilities represent the maximum forces and moments that can be applied or sustained by the manipulator. The wrench capabilities of PPMs are determined by a linear mapping of the actuator
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14

Kajio, Yusuke, Hiroyasu Iwata, Yoshihiro Tokumasu, and Shigeki Sugano. "2A1-S-047 Body Posture Control Coordinating Stability and Directional Force Tolerability Using Force Polytope(Humanoid 3,Mega-Integration in Robotics and Mechatronics to Assist Our Daily Lives)." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2005 (2005): 173. http://dx.doi.org/10.1299/jsmermd.2005.173_4.

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15

Frewin, Christopher L., Camilla Coletti, Christian Riedl, Ulrich Starke, and Stephen E. Saddow. "A Comprehensive Study of Hydrogen Etching on the Major SiC Polytypes and Crystal Orientations." Materials Science Forum 615-617 (March 2009): 589–92. http://dx.doi.org/10.4028/www.scientific.net/msf.615-617.589.

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A comprehensive study on the hydrogen etching of numerous SiC polytype surfaces and orientations has been performed in a hot wall CVD reactor under both atmospheric and low pressure conditions. The polytypes studied were 4H and 6H-SiC as well as 3C-SiC grown on Si substrates. For the hexagonal polytypes the wafer surface orientation was both on- and off-axis, i.e. C and Si face. The investigation includes the influence of the prior surface polishing method on the required etching process parameters. 3C-SiC was also studied grown in both the (100) and (111) orientations. After etching, the samp
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16

Kim, Hong-Ki, Soo In Kim, Seongjun Kim, Nam-Suk Lee, Hoon-Kyu Shin, and Chang Woo Lee. "Relation between work function and structural properties of triangular defects in 4H-SiC epitaxial layer: Kelvin probe force microscopic and spectroscopic analyses." Nanoscale 12, no. 15 (2020): 8216–29. http://dx.doi.org/10.1039/c9nr10126h.

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In the defective SiC epitaxial layer, the work function variation was observed by Kelvin probe force microscopy (KPFM), and the work function difference came from the variation of polytype and the disordered surface.
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17

Rezzoug, N., V. Hernandez, J. Jacquier-Bret, and P. Gorce. "Comparison between model-based and measured force polytopes: towards isometric force capacity evaluation." Computer Methods in Biomechanics and Biomedical Engineering 16, sup1 (2013): 172–74. http://dx.doi.org/10.1080/10255842.2013.815972.

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18

Corves, Burkhard, Jan Brinker, Michael Lorenz, and Martin Wahle. "Design methodology for translational parallel manipulators exhibiting actuation redundancy." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 3 (2015): 425–36. http://dx.doi.org/10.1177/0954406215591048.

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In general, spatial manipulation of objects can be accomplished by parallel manipulators, whose number of actuators is equal to the demanded number of degrees of freedom. In order to improve, for example, positioning accuracy, stiffness characteristics, and transmission behavior, redundant drives can be added to the manipulator. Accordingly, this paper presents a methodology for the design of a translational parallel manipulator with redundant actuation. Based on the results of systematic structural syntheses and developed selection criteria, two valid configurations (i.e. 3-PŘŘŘ and 3-PUU) ar
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19

Camarda, Massimo, Antonino La Magna, Andrea Severino, and Francesco La Via. "Extended Study of the Step-Bunching Mechanism during the Homoepitaxial Growth of SiC." Materials Science Forum 615-617 (March 2009): 117–20. http://dx.doi.org/10.4028/www.scientific.net/msf.615-617.117.

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We discuss the possible source of surface instabilities (with specific reference to the step bunching phenomena) during the growth of cubic and hexagonal Silicon Carbide polytypes. For this analysis we use: results from super-lattice Kinetic Monte Carlo simulations, atomic force microscope surface analysis and literature data. We show that only hexagonal polytypes with misorientation cut toward the &lt;11-20&gt; direction suffer “intrinsically” the step bunching phenomena (i.e. it are present, independently on the growth conditions) whereas cubic polytypes and hexagonal ones with misorientatio
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20

Kaur, Harjeet. "Points to Ponder in the Study of Cadmium Iodide." International Letters of Chemistry, Physics and Astronomy 27 (February 2014): 1–5. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.27.1.

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During the growth of cadmium iodide crystals from solution, it has been observed that sometimes the crystal suddenly rotates. Probably, the convection currents are providing the force for the rotation. Mathematically, this force can be estimated and it must be greater than the van-der Walls force acting between adjacent sandwiches of cadmium iodide and can give rise to polytypic phase transformations. Further, studies of vacancies and the density measurements of various polytypes can help in understanding the phenomenon of polytypism better.
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21

Kaur, Harjeet. "Points to Ponder in the Study of Cadmium Iodide." International Letters of Chemistry, Physics and Astronomy 27 (February 6, 2014): 1–5. http://dx.doi.org/10.56431/p-03c14b.

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During the growth of cadmium iodide crystals from solution, it has been observed that sometimes the crystal suddenly rotates. Probably, the convection currents are providing the force for the rotation. Mathematically, this force can be estimated and it must be greater than the van-der Walls force acting between adjacent sandwiches of cadmium iodide and can give rise to polytypic phase transformations. Further, studies of vacancies and the density measurements of various polytypes can help in understanding the phenomenon of polytypism better.
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22

Pezoldt, Jörg, and Andrei Alexandrovich Kalnin. "Defect Interactions and Polytype Transitions." Advanced Materials Research 324 (August 2011): 217–20. http://dx.doi.org/10.4028/www.scientific.net/amr.324.217.

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The polytype transitions are caused by disorder generation in the initial structure due to energy dissipation. The disorder is strongly related to the formation and propagation of stacking faults and partial dislocations. Collective and selective interactions between these defects result in a stability loss of the original structure leading to nonequilibrium phase transition occur if the critical point is reached. The stability of the defect subsystem was investigated in the stationary state for three types of stacking faults. The combination of the stability analysis with the defect generatio
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23

Ben Haj Amara, A., J. Ben Brahim, N. Ben Ayed, and H. Ben Rhaiem. "Presence de nacrite sur d'anciens gisements de Pb-Zn du Nord Tunisien." Clay Minerals 31, no. 1 (1996): 127–30. http://dx.doi.org/10.1180/claymin.1996.031.1.11.

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La nacrite constitue le plus rare polytype des kaolinites. Traditionnellement, on attribue á ce minéral une genèse hydrothermale (Ross &amp; Kerr, 1931; Hanson et al., 1981 ), cependant Btihmann (1988) décrit sa formation en condition normale de température et de pression dans des milieux de solution et de force ionique élevées. Dans ce travail, la nacrite est mise en évidence dans deux anciens gisements de Pb-Zn situés dans les massifs de Jbel Slata et Garn Halfaya au nord de la Tunisie (Fig.l).
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24

Shin, Yun Ji, Soo In Kim, Hyeon Jin Jung, Chang Woo Lee, and Wook Bahng. "Nanomechanical Analysis of Triangular Defect in 4H-SiC Epilayer." Materials Science Forum 778-780 (February 2014): 394–97. http://dx.doi.org/10.4028/www.scientific.net/msf.778-780.394.

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We report an investigation of the formation of triangular defects (TDs) in 4H–SiC expitaxial layers using Kelvin probe force microscopy (KPFM) and a nano-indenter. The results provide valuable information on the crystallographic structure, including the polytype nature of the TDs and surface potential profile. The TDs were also characterized using micro-Raman spectroscopy and high-resolution transmission electron microscopy. We found that the TDs were composed of a thick 3C-SiC band, as well as stacking faults (SFs) in the 4H-SiC epilayer.
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25

Zhong, Wei, and Cong Yu. "The Critical Core Mass of Rotating Planets." Astrophysical Journal 926, no. 1 (2022): 43. http://dx.doi.org/10.3847/1538-4357/ac4261.

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Abstract The gravitational harmonics measured from the Juno and Cassini spacecraft help us specify the internal structure and chemical elements of Jupiter and Saturn, respectively. However, we still do not know much about the impact of rotation on the planetary internal structure as well as on their formation. The centrifugal force induced by the rotation deforms the planetary shape and partially counteracts the gravitational force. Thus, rotation will affect the critical core mass of the exoplanet. Once the atmospheric mass becomes comparable to the critical core mass, the planet will enter t
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26

Pesnell, W. Dean. "Pulsations of Eötvös Spheres." International Astronomical Union Colloquium 111 (1989): 282. http://dx.doi.org/10.1017/s0252921100011908.

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AbstractA derivation of Eötvös spheres and their pulsations is presented. These spheres incorporate a short range force in their gravitational potential. We used a Yukawa formulation to agree with other workers in this field, although a slightly different form would guarantee a gravitational force that is always attractive. Various relationships are obeyed by these obejcts, much like the polytropes to which they are similar. An attempt is made to test whether a short range force can resolve two outstanding problems in astrophysics. These are the Cepheid mass discrepancy and the frequencies of
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27

Miao, M. S., and Walter R. L. Lambrecht. "Stacking Faults and 3C Quantum Wells in Hexagonal SiC Polytypes." Materials Science Forum 527-529 (October 2006): 351–54. http://dx.doi.org/10.4028/www.scientific.net/msf.527-529.351.

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The electronic driving force for growth of stacking faults (SF) in n-type 4H SiC under annealing and in operating devices is discussed. This involves two separate aspects: an overall thermodynamic driving force due to the capture of electrons in interface states and the barriers that need to be overcome to create dislocation kinks which advance the motion of partial dislocations and hence expansion of SF. The second problem studied in this paper is whether 3C SiC quantum wells in 4H SiC can have band gaps lower than 3C SiC. First-principles band structure calculations show that this is not the
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28

Nuzhdin, Sergey V. "The distribution of transposable elements on X chromosomes from a natural population of Drosophila simulans." Genetical Research 66, no. 2 (1995): 159–66. http://dx.doi.org/10.1017/s0016672300034509.

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SummaryThe distribution of 13 transposable element families along 15 X chromosomes from an African natural population of Drosophila simulans was determined by in situ hybridization to polytene chromosomes. The transposable elements cloned from Drosophila melanogaster all hybridized with Drosophila simulans chromosomes. The number of copies per family was 3·5 times lower in the latter species and correlated with the copy number per family in Drosophila melanogaster. With the exception of 297, the copy number per chromosome followed a Poisson distribution. Element frequencies per chromosome band
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29

Eriksson, Jens, Donatella Puglisi, Remigijus Vasiliauskas, Anita Lloyd Spetz, and Rositza Yakimova. "Thickness Uniformity and Electron Doping in Epitaxial Graphene on SiC." Materials Science Forum 740-742 (January 2013): 153–56. http://dx.doi.org/10.4028/www.scientific.net/msf.740-742.153.

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Large variations have been observed in the uniformity and carrier concentration of epitaxial graphene grown on SiC by sublimation for samples grown under identical conditions and on nominally on-axis hexagonal SiC (0001) substrates. We have previously shown that these issues are both related to the morphology of the graphene-SiC surface after sublimation growth. Here we present a study on how the substrate polytype, substrate surface morphology and surface restructuring during sublimation growth affect the uniformity and carrier concentration in epitaxial graphene on SiC. These issues were inv
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30

Wasyluk, Joanna, Tatiana S. Perova, Sergey A. Kukushkin, Andrey V. Osipov, Nikolay A. Feoktistov, and Sergey A. Grudinkin. "Raman Investigation of Different Polytypes in SiC Thin Films Grown by Solid-Gas Phase Epitaxy on Si (111) and 6H-SiC Substrates." Materials Science Forum 645-648 (April 2010): 359–62. http://dx.doi.org/10.4028/www.scientific.net/msf.645-648.359.

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Raman spectroscopy was applied to investigate a series of SiC films grown on Si and 6H-SiC substrates by a new method of solid gas phase epitaxy. During the growth characteristic voids are formed in Si at the SiC/Si interface. Raman peak position, intensity and linewidth were used to characterize the quality and the polytype structure of the SiC layers. A large enhancement in the peak intensity of the transverse optical and longitudinal optical phonon modes of SiC is observed for the Raman signal measured at the voids. In addition, scanning electron microscopy and atomic force microscopy were
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31

Tymicki, Emil, Krzysztof Grasza, Katarzyna Racka, et al. "Growth of 4H-SiC Single Crystals on 6H-SiC Seeds with an Open Backside by PVT Method." Materials Science Forum 615-617 (March 2009): 15–18. http://dx.doi.org/10.4028/www.scientific.net/msf.615-617.15.

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4H-SiC single crystals grown by the seeded physical vapour transport method have been investigated. These crystals were grown on 6H-SiC seeds. The influence of the seed temperature, form and granulation of SiC source materials on the stability and efficiency of the 4H polytype growth have been investigated. A new way of the seed mounting - with an open backside - has been used. Crystals obtained were free of structural defects in the form of hexagonal voids. The crystalline structure of SiC crystals was investigated by EBSD (Electron Backscatter Diffraction) and X-Ray diffraction methods. More
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32

Patton, Ron, Lejun Chen, and Supat Klinkhieo. "An LPV pole-placement approach to friction compensation as an FTC problem." International Journal of Applied Mathematics and Computer Science 22, no. 1 (2012): 149–60. http://dx.doi.org/10.2478/v10006-012-0011-z.

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An LPV pole-placement approach to friction compensation as an FTC problemThe concept of combining robust fault estimation within a controller system to achieve active Fault Tolerant Control (FTC) has been the subject of considerable interest in the recent literature. The current study is motivated by the need to develop model-based FTC schemes for systems that have no unique equilibria and are therefore difficult to linearise. Linear Parameter Varying (LPV) strategies are well suited to model-based control and fault estimation for such systems. This contribution involves pole-placement within
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33

Davydov, Sergey Y. "Pressure Effect on the Elastic Properties of SiC Polytypes." Materials Science Forum 483-485 (May 2005): 303–6. http://dx.doi.org/10.4028/www.scientific.net/msf.483-485.303.

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The pressure dependences of the second-order elastic constants ij C and the velocity of sound in 3C-SiC and 2H-SiC crystals are calculated in the framework of the Keating model with the additional assumption that the central α and the noncentral β force constants are linear functions of external hydrostatic pressure. Grüneisen parameters for the different acoustic modes of 3C-SiC have been also calculated. The third –order elastic constants ijk C for 3C-SiC are determined from the dependences of ij C on the pressure.
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34

Baghestan, K., S. M. Rezaei, H. A. Talebi, and M. Zareinejad. "Robust force control in a novel electro-hydraulic structure using polytopic uncertainty representation." ISA Transactions 53, no. 6 (2014): 1873–80. http://dx.doi.org/10.1016/j.isatra.2014.08.002.

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35

Lejda, Katarzyna, Janusz Partyka, and Jerzy F. Janik. "Thermogravimetric/Thermal–Mass Spectroscopy Insight into Oxidation Propensity of Various Mechanochemically Made Kesterite Cu2ZnSnS4 Nanopowders." Materials 17, no. 6 (2024): 1232. http://dx.doi.org/10.3390/ma17061232.

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Thermogravimetry coupled with thermal analysis and quadrupole mass spectroscopy TGA/DTA-QMS were primarily used to assess the oxidation susceptibility of a pool of nanocrystalline powders of the semiconductor kesterite Cu2ZnSnS4 for prospective photovoltaic applications, which were prepared via the mechanochemically assisted synthesis route from two different precursor systems. Each system, as confirmed by XRD patterns, yielded first the cubic polytype of kesterite with defunct semiconductor properties, which, after thermal annealing at 500 °C under neutral gas atmosphere, was converted to the
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36

Charlesworth, Brian, and Angela Lapid. "A study of ten families of transposable elements on X chromosomes from a population of Drosophila melanogaster." Genetical Research 54, no. 2 (1989): 113–25. http://dx.doi.org/10.1017/s0016672300028482.

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SummaryData were collected on the distribution of ten families of transposable elements among fourteen X chromosomes isolated from a natural population of Drosophila melanogaster, by means of in situ hybridization to polytene chromosomes. It was found that, with the exception of roo, the copy number per chromosome followed a Poisson distribution. There was no evidence for linkage disequilibrium, either within or between families. Some pairs of families of elements were correlated with respect to the identity of the sites that were occupied in the sample, although there was no evidence for a co
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37

Ashida, Koji, Toru Aiso, Manabu Okamoto, Hirokazu Seki, Makoto Kitabatake, and Tadaaki Kaneko. "Low Energy Electron Channeling Contrast Imaging from 4H-SiC Surface by SEM and its Comparison with CDIC-OM and PL Imaging." Materials Science Forum 897 (May 2017): 193–96. http://dx.doi.org/10.4028/www.scientific.net/msf.897.193.

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Low energy electron channeling contrast imaging (LE-ECCI) by scanning electron microscopy (SEM) was adopted to evaluate both the direction and length of the topmost hexagonal stacking sequence of the Si–C bilayers on 4H-SiC (0001). LE-ECCI revealed the change in the dangling bond configuration at step edges depending on SiC thermal etching rate, which was difficult to be detected by optical microscope (OM) and even by atomic force microscopy (AFM). Furthermore, LE-ECCI was applied to evaluate the atomic structure of polytype inclusions in commercially available 3-inch diameter 4o off-axis 4H-S
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38

Lignières, F., and M. Rieutord. "Oscillations of Fast Rotating Stars: p-Modes in Centrifugally Flattened Polytropes." Symposium - International Astronomical Union 215 (2004): 414–15. http://dx.doi.org/10.1017/s0074180900195956.

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Oscillation modes of rapidly rotating stars have not yet been calculated with precision, rotational effects being generally approximated by perturbation methods. We developed a mathematical formalism and a numerical method which fully account for the deformation of the star by the centrifugal force. The method has been first tested in the case of Maclaurin spheroids and then applied to uniformly rotating polytropic stars.
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39

Eid, Jessica, Jean Louis Santailler, Bernard Ferrand, et al. "Growth of Cubic Silicon Carbide Crystals from Solution." Materials Science Forum 527-529 (October 2006): 123–26. http://dx.doi.org/10.4028/www.scientific.net/msf.527-529.123.

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Cubic-silicon carbide crystals have been grown from solution by using the traveling-zone method. In this technique a molten silicon zone heated by induction coils is held between two rods of polycrystalline silicon carbide. Due to the growth set-up and boundary conditions, different mass transfer mechanisms are operative : diffusion, buoyancy, Marangoni convection and forced convection. The growth experiments have been performed on various seed crystals. Cubic SiC crystals were grown with a [111] habit on the [0001] silicon faces of 4H SiC seeds. The polytype 3C-SiC was identified by Transmiss
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40

Charlesworth, Brian, Angela Lapid, and Darlene Canada. "The distribution of transposable elements within and between chromosomes in a population of Drosophila melanogaster. I. Element frequencies and distribution." Genetical Research 60, no. 2 (1992): 103–14. http://dx.doi.org/10.1017/s0016672300030792.

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SummaryData were collected on the distribution of nine families of transposable elements among second and third chromosomes isolated from a natural population of Drosophila melanogaster, by means of in situ hybridization of element probes to polytene chromosomes. It was found that the copy numbers per chromosome in the distal sections of the chromosome arms followed a Poisson distribution. Elements appeared to be distributed randomly along the distal sections of the chromosome arms. There was no evidence for linkage disequilibrium in the distal sections of the chromosomes, but some significant
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41

Lozman, Owen R., Richard J. Bushby, and Jeremy G. Vinter†. "Complementary polytopic interactions (CPI) as revealed by molecular modelling using the XED force field." Journal of the Chemical Society, Perkin Transactions 2, no. 9 (2001): 1446–52. http://dx.doi.org/10.1039/b103390p.

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42

de Grauw, C. J., A. Avogadro, D. J. van den Heuvel, et al. "Chromatin Structure in Bands and Interbands of Polytene Chromosomes Imaged by Atomic Force Microscopy." Journal of Structural Biology 121, no. 1 (1998): 2–8. http://dx.doi.org/10.1006/jsbi.1997.3929.

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43

Hindman, Bradley W., and Rekha Jain. "Overstable Convective Modes in a Polytropic Stellar Atmosphere." Astrophysical Journal 943, no. 2 (2023): 127. http://dx.doi.org/10.3847/1538-4357/acaec4.

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Abstract Within the convection zone of a rotating star, the presence of the Coriolis force stabilizes long-wavelength convective modes. These modes, which would have been unstable if the star lacked rotation, are called overstable convective modes or thermal Rossby waves. We demonstrate that the Sun’s rotation rate is sufficiently rapid that the lower half of its convection zone could possess overstable modes. Further, we present an analytic solution for atmospheric waves that reside within a polytropic stratification. We explore in detail the properties of the overstable and unstable wave mod
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44

Damiani, C., R. H. Cameron, A. C. Birch, and L. Gizon. "Rossby modes in slowly rotating stars: depth dependence in distorted polytropes with uniform rotation." Astronomy & Astrophysics 637 (May 2020): A65. http://dx.doi.org/10.1051/0004-6361/201936251.

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Context. Large-scale Rossby waves have recently been discovered based on measurements of horizontal surface and near-surface solar flows. Aims. We are interested in understanding why it is only equatorial modes that are observed and in modelling the radial structure of the observed modes. To this aim, we have characterised the radial eigenfunctions of r modes for slowly rotating polytropes in uniform rotation. Methods. We followed Provost et al. (1981, A&amp;A, 94, 126) and considered a linear perturbation theory to describe quasi-toroidal stellar adiabatic oscillations in the inviscid case. W
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45

Powell, J. Anthony, Philip G. Neudeck, Andrew J. Trunek, and Phillip B. Abel. "Step Structures Produced by Hydrogen Etching of Initially Step-Free (0001) 4H-SiC Mesas." Materials Science Forum 483-485 (May 2005): 753–56. http://dx.doi.org/10.4028/www.scientific.net/msf.483-485.753.

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This paper presents new observations resulting from in-situ high temperature hydrogen etching of 4H-SiC mesas that were step-free prior to initiation of etching. In particular, it was found that well-ordered pyramidal-shaped step train structures could be produced on mesa top surfaces via stepflow etching proceeding inward from the sides of mesas. In many cases, the height of steps etched inward from {112 0} mesa sides is 0.5 nm (2 Si-C bilayers), while the height of steps etched inward from {11 00} sides of the same mesa is 1.0 nm (4 Si-C bilayers, the repeat distance of the 4H-SiC polytype).
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46

Galambos, Péter, Péter Baranyi, and Gusztáv Arz. "Tensor product model transformation-based control design for force reflecting tele-grasping under time delay." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 4 (2013): 765–77. http://dx.doi.org/10.1177/0954406213490375.

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The improvement of direct human–robot physical interaction has recently become one of the strongest motivation factors in robotics research. Impedance/admittance control methods are key technologies in several directions of advanced robotics such as dexterous manipulation, haptics and telemanipulation. In this paper, we propose a control scheme and a design technique for stabilising shared impedance/admittance-based bilateral telemanipulation under varying time delay. The proposed scheme introduces delay-adaptive non-linear damping to stabilise the impedance model. A modified version of the te
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47

Zehe, A., A. Ramírez, and J. Vázquez. "Dimorphism and perturbed growth kinetics of cadmium sulfide thin films in a chemical working solution." Canadian Journal of Physics 80, no. 3 (2002): 299–307. http://dx.doi.org/10.1139/p01-135.

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Thin films of numerous compound semiconductors, which crystallize in a (cubic) sphalerite structure, often display an alternative allotropic form as (hexagonal) wurtzite. The relative proportion of each depends in a characteristic manner on the growth conditions chosen. We applied an external magnetic flux during the growth of cadmium sulfide thin films from a chemical working solution, where the CdS molecules or small clusters are formed by a controlled reaction in an aqueous solution. The incorporation mechanism of such neutral particles into the polycrystalline CdS thin film is supposed to
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48

Song, Li, Guo Tian He, Zhi Zeng, et al. "The Model and Simulation of Magnetorheological Grease Characteristics." Applied Mechanics and Materials 246-247 (December 2012): 1214–19. http://dx.doi.org/10.4028/www.scientific.net/amm.246-247.1214.

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Magneto-rheological grease attracts the attention as a new kind of intelligent material. Under the external magnetic force, it is difficult to use traditional mathematics model to solve and analysis internal structure because of its complexity and polytropy. The modeling and simulation for complex system using computer becomes a good way to investigate complex system. Based on the electromagnetic theory and computer simulation, this paper constructed the model of shear stress to describe the characteristic of magneto-rheological grease that is to use body centered cubic pillars model to analys
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49

McRobie, Allan. "The geometry of structural equilibrium." Royal Society Open Science 4, no. 3 (2017): 160759. http://dx.doi.org/10.1098/rsos.160759.

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Building on a long tradition from Maxwell, Rankine, Klein and others, this paper puts forward a geometrical description of structural equilibrium which contains a procedure for the graphic analysis of stress resultants within general three-dimensional frames. The method is a natural generalization of Rankine’s reciprocal diagrams for three-dimensional trusses. The vertices and edges of dual abstract 4-polytopes are embedded within dual four-dimensional vector spaces, wherein the oriented area of generalized polygons give all six components (axial and shear forces with torsion and bending momen
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50

Korucuk, Selçuk, and Ahmet Aytekin. "A field study examining barriers to logistics 4.0 using polytopic fuzzy RANCOM." Journal of Process Management and New Technologies 12, no. 3-4 (2024): 90–100. https://doi.org/10.5937/jpmnt12-54800.

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Logistics companies are increasingly focusing more on technological transformation and development to save costs and transition to a more flexible structure, and their business objectives are closely tied with this framework. Changing business processes and technological revolutions force logistics companies to become more adaptive and agile, demanding the creation of organizational procedures in this context. To do this, the technology revolution, also known as logistics 4.0, is gaining popularity in the logistics industry and playing an essential role in cost savings for businesses. Logistic
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