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Journal articles on the topic 'Tube of trajectories'

Author: Grafiati

Published: 10 March 2023

Last updated: 31 July 2025

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1

YAZGI, Arzu, Vedat DEMİR, and Adnan DEĞİRMENCİOĞLU. "Comparison of computational fluid dynamics-based simulations and visualized seed trajectories in different seed tubes." TURKISH JOURNAL OF AGRICULTURE AND FORESTRY 44, no. 6 (2020): 599–611. http://dx.doi.org/10.3906/tar-1910-15.

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The objective of this study was to compare computational fluid dynamics (CFD)-based simulations and visualized seed trajectories in different seed tubes that can provide seed incorporation into the soil with enhanced seed spacing. The other objective was to determine the relation between the seed trajectories and peripheral speed of the vacuum disk. In order to meet the first objective, 2 different seeds (corn and cotton) and artificial spherical material (Ø10 mm) were tested under laboratory conditions. The seeds and artificial material were released by free fall into the semitransparent seed

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Wacławiak, Krzysztof, and Sylwester Kalisz. "Influence of Selected Parameters on Ash Particle Trajectories When Modelling Deposition on Superheater Tubes in Pulverised Coal Boilers Using Fluent Code." Chemical and Process Engineering 35, no. 3 (2014): 305–16. http://dx.doi.org/10.2478/cpe-2014-0023.

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Abstract Widely used CFD codes enable modelling of PC boilers operation. One of the areas where these numerical simulations are especially promising is predicting deposition on heat transfer surfaces, mostly superheaters. The basic goal of all simulations is to determine trajectories of ash particles in the vicinity of superheater tubes. It results in finding where on the surface the tube will be hit by particles, and what diameter and mass flow of the particles are. This paper presents results of CFD simulations for a single tube and a bundle of in-line tubes as well. It has been shown that a

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3

Garriga-Casanovas, Arnau, and Ferdinando Rodriguez y Baena. "Complete follow-the-leader kinematics using concentric tube robots." International Journal of Robotics Research 37, no. 1 (2017): 197–222. http://dx.doi.org/10.1177/0278364917746222.

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Concentric tube robots offer the capability of follow-the-leader motion, which is desirable when navigating in cluttered environments, such as in minimally invasive surgery or in-situ inspections. The follow-the-leader capabilities identified in the existing literature, however, are limited to trajectories with piecewise constant-curvature segments or piecewise helical segments. A complete study of follow-the-leader kinematics is, therefore, relevant to determine the full potential of these robots, and clarify an open question. In this paper, a general analysis of follow-the-leader motion is p

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4

Gabor, Grzegorz. "Periodic solutions for nonautonomous differential equations and inclusions in tubes." Abstract and Applied Analysis 2004, no. 12 (2004): 1057–79. http://dx.doi.org/10.1155/s1085337504403042.

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We study the existence of periodic trajectories for nonautonomous differential equations and inclusions remaining in a prescribed compact subset of an extended phase space. These sets of constraints are nonconvex right-continuous tubes not satisfying the viability tangential condition on the whole boundary. We find sufficient conditions for existence of viable periodic trajectories studying properties of the exit subset of the tube. A new approximation approach for continuous multivalued maps is presented.

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ISHII, Takahiro, and Junta DOI. "Tube Representation of Trajectories Using Spline Functions." Journal of the Visualization Society of Japan 11, Supplement2 (1991): 101–4. http://dx.doi.org/10.3154/jvs.11.supplement2_101.

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6

Nandan, Hemwati, and Akhilesh Ranjan. "Regge trajectories of exotic hadrons in the flux tube model." International Journal of Modern Physics A 31, no. 04n05 (2016): 1650007. http://dx.doi.org/10.1142/s0217751x1650007x.

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We have investigated the Regge trajectories of exotic hadrons by considering different possible pentaquark configurations with finite quark mass in the flux tube model. Significant deviation is observed in the linear behavior of the Regge trajectories for pentaquark systems in view of the universal value of the Regge slope parameter for hadrons. The modified Regge trajectories are also compared with the available experimental and lattice data. It is observed that the nonlinear Regge trajectories of such pentaquark systems can be well described by the relativistic corrections in view of the cur

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7

Choi, M., R. Greif, and H. R. Baum. "A Study of Heat Transfer and Particle Motion Relative to the Modified Chemical Vapor Deposition Process." Journal of Heat Transfer 111, no. 4 (1989): 1031–37. http://dx.doi.org/10.1115/1.3250764.

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Heat transfer and particle motion relative to the modified chemical vapor deposition process have been studied for general values of the torch speed. Three-dimensional temperature fields have been obtained over the entire cross section of the tube and the effects of tube rotation and localized torch heating in the axial and circumferential directions have been studied. The particle trajectories have been calculated from a formulation that includes the contributions from forced flow, i.e, Poiseuille flow in the axial direction, rigid body rotation about the tube axis, and thermophoretic contrib

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8

Bourgois, Auguste, Simon Rohou, Luc Jaulin, and Andreas Rauh. "Proving Feasibility of a Docking Mission: A Contractor Programming Approach." Mathematics 10, no. 7 (2022): 1130. http://dx.doi.org/10.3390/math10071130.

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Recent advances in computational power, algorithms, and sensors allow robots to perform complex and dangerous tasks, such as autonomous missions in space or underwater. Given the high operational costs, simulations are run beforehand to predict the possible outcomes of a mission. However, this approach is limited as it is based on parameter space discretization and therefore cannot be considered a proof of feasibility. To overcome this limitation, set-membership methods based on interval analysis, guaranteed integration, and contractor programming have proven their efficiency. Guaranteed integ

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9

Shen, Xiaobin, Chunhua Xiao, Yijun Ning, Huanfa Wang, Guiping Lin, and Liangquan Wang. "Research on the Methods for Obtaining Droplet Impingement Characteristics in the Lagrangian Framework." Aerospace 11, no. 3 (2024): 172. http://dx.doi.org/10.3390/aerospace11030172.

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The impact of supercooled water droplets is the cause of aircraft icing, and the acquisition of impingement characteristics is the key to icing prediction and the design of ice protection systems. The introduction of water droplet collection efficiency is required to obtain the characteristics for the Lagrangian method. In this work, a traditional flow tube method, a local flow tube method, and a statistical method are established to calculate the local collection efficiency, based on Lagrangian droplet trajectories. Through the numerical simulations of the air–droplet flow field around an NAC

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10

Dumbrajs, Olgerts. "ELECTRON TRAJECTORIES IN A REALISTIC GYROTRON RESONATOR." Mathematical Modelling and Analysis 3, no. 1 (1998): 74–80. http://dx.doi.org/10.3846/13926292.1998.9637088.

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Gyrotron is a special tube generating powerful radiowaves in the millimeter wave range. Gyrotrons are mainly used to heat nuclear fusion plasma, in order to induce controlled thermonuclear reactions on earth. In addition, they have found a wide utility in radars and the high‐temperature processing of materials. Differential equations describing gyrotron operation are analyzed from the mathematical point of view. Phase portraits of electron trajectories in realistic resonators are determined.

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11

Ren, Dong-Jie, Shui-Long Shen, Arul Arulrajah, and Huai-Na Wu. "Evaluation of ground loss ratio with moving trajectories induced in double-O-tube (DOT) tunnelling." Canadian Geotechnical Journal 55, no. 6 (2018): 894–902. http://dx.doi.org/10.1139/cgj-2017-0355.

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This paper investigates the influence of moving trajectories on ground loss ratio (GRL) due to the double-O-tube (DOT) tunnelling method. DOT tunnelling has three moving trajectories: pitching, yawing, and rolling, which have different behaviours during tunnel construction compared with those from single circular shield tunnelling. These moving trajectories cause overexcavation during tunnelling. The calculation method of gap area between the DOT shield machine and linings is evaluated in this research. Based on the superposition concept, the modification equation of GLR is proposed, which tak

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12

Torres, A., A. Medina, F. J. Higuera, and P. D. Weidman. "On super free fall." Journal of Fluid Mechanics 723 (April 16, 2013): 653–64. http://dx.doi.org/10.1017/jfm.2013.144.

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AbstractVillermaux & Pomeau (J. Fluid Mech., vol. 642, 2010, p. 147) analysed the motion of the interface of an inviscid liquid column released from rest in a vertical tube whose area expands gradually downwards, with application to an inverted conical container for which experimental measurements were carried out. An error in the analysis is found and corrected in the present investigation, which provides the new governing equation for the super-accelerated interface motion down gradually varying tubes in general, and integrated results for interface trajectories, velocities and accelerat

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13

SPASIĆ, Miodrag, Darko MITIĆ, Saša S. NIKOLIĆ, Marko MILOJKOVIĆ, Miroslav MILOVANOVIĆ, and Anđela ĐORĐEVIĆ. "Malmquist orthogonal functions based Tube model predictive control with sliding mode for DC motor servo system." Proceedings of the Romanian Academy, Series A: Mathematics, Physics, Technical Sciences, Information Science 25, no. 3 (2024): 241–51. http://dx.doi.org/10.59277/pra-ser.a.25.3.09.

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This paper introduces a novel approach to the conventional model predictive control design within a tube model predictive control framework for a DC motor servo system that is an important component of various control systems in process industries. Tube model predictive control proves to be an effective method in the formulation, analysis, and implementation of robust control strategies. The objective is to include all possible trajectories of an uncertain system within a tube of the nominal system trajectories. Therefore, the proposed method incorporates discrete-time generalized Malmquist or

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14

Chen, Jianqiao, and Guofu Tian. "A Tube Linear Model Predictive Control Approach for Autonomous Vehicles Subjected to Disturbances." Applied Sciences 14, no. 7 (2024): 2793. http://dx.doi.org/10.3390/app14072793.

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The path tracking performance of autonomous vehicles is degraded by common disturbances, especially those that affect the safety of autonomous vehicles (AVs) in obstacle avoidance conditions. To improve autonomous vehicle tracking performances and their computational efficiency when subjected to common disturbances, this paper proposes a tube linear model predictive controller (MPC) framework for autonomous vehicles. A bicycle vehicle dynamics model is developed and employed in the tube MPC control design in the proposed framework. A robust invariant set is calculated with an efficient linear

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15

Comber, David B., E. Bryn Pitt, Hunter B. Gilbert, et al. "Optimization of Curvilinear Needle Trajectories for Transforamenal Hippocampotomy." Operative Neurosurgery 13, no. 1 (2016): 15–22. http://dx.doi.org/10.1227/neu.0000000000001361.

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Abstract BACKGROUND: The recently developed magnetic resonance imaging–guided laser-induced thermal therapy offers a minimally invasive alternative to craniotomies performed for tumor resection or for amygdalohippocampectomy to control seizure disorders. Current laser-induced thermal therapies rely on linear stereotactic trajectories that mandate twist-drill entry into the skull and potentially long approaches traversing healthy brain. The use of robotically driven, telescoping, curved needles has the potential to reduce procedure invasiveness by tailoring trajectories to the curved shape of t

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16

Feng, Huicheng, and Teck Neng Wong. "Electrophoresis of a Cylinder in a Cylindrical Tube." Communications in Computational Physics 22, no. 4 (2017): 1101–22. http://dx.doi.org/10.4208/cicp.oa-2017-0011.

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AbstractElectrophoresis of a cylinder suspended in a cylindrical tube is analytically studied in the limit of thin electric double layer approximation. The electric and fluid flow fields within the annulus, and the cylinder velocities are analytically obtained in bipolar coordinates. The results are analyzed with various values of dimensionless parameters: eccentricity, cylinder-to-tube radius ratio and tube-to-cylinder zeta potential ratio (i.e., tube-to-cylinder velocity scale ratio). The analysis shows that microvortices are generated within the annulus. By changing the parameters, differen

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17

M., VLASENKO, and NIEMTSEV E. "Investigation of the efficiency of the heat exchange process in the MO-2 cooler of turbine oil depending on the arrangement scheme of tubes in tube grids." Journal of Electrical and power engineering 28, no. 1 (2023): 12–18. http://dx.doi.org/10.31474/2074-2630-2023-1-12-18.

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Effective cooling of the turbine oil is important for the reliability and optimal operation of the turbogenerator. The oil is used for lubrication and cooling of the support and radial bearings of the turbine, bearings of the generator and reducer, gears and splined rollers. It is also used as a hydraulic fluid in the hydraulic turbine start-up system. For reliable and safe operation of the system, it is necessary to maintain the correct temperature of the lubricant. Research is aimed at studying the influence of the layout of the heat exchange tubes in the tube grids on the cooling efficiency

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18

Ganesh, C. L., K. Santosh, Mallanna Renuka, and Karthik Shastry. "Design Of An Electrostatic Ion Trap And Time-of-Flight Tube Using SIMION Software." ECS Transactions 107, no. 1 (2022): 18859–66. http://dx.doi.org/10.1149/10701.18859ecst.

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Electrostatic traps are a class of ion traps that rely on electric fields to confine charged particles in a region of space. It uses an electric field to trap the incoming ions from an ion source, confine them for a certain period of time, and then release them either as a continuous or pulsed ion beam. Ions once released from the trap are made to fly through a Time of Flight (ToF) tube for segregation based on their energies and mass. The time taken to travel the length of the ToF tube is equated to the mass of the ion, which can further be used to calculate the energy and mass of the ions. S

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19

Ait Oucheggou, Ouardia, Véronique Pointeau, Guillaume Ricciardi, Élisabeth Guazzelli, and Laurence Bergougnoux. "Particle-laden flow around an obstacle in a square pipe: experiments and modeling." Mechanics & Industry 21, no. 5 (2020): 517. http://dx.doi.org/10.1051/meca/2020063.

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Particle trapping and deposition around an obstacle occur in many natural and industrial situations and in particular in the nuclear industry. In the steam generator of a nuclear power plant, the progressive obstruction of the flow due to particle deposition reduces the efficiency and can induce tube cracking leading to breaking and damage. The steam generator then loses its role as a safety barrier of the nuclear power plant. From a fundamental standpoint, dilute and concentrated particulate flows have received a growing attention in the last decade. In this study, we investigate the transpor

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20

Lin, Y. T., M. Choi, and R. Greif. "A Three-Dimensional Analysis of the Flow and Heat Transfer for the Modified Chemical Vapor Deposition Process Including Buoyancy, Variable Properties, and Tube Rotation." Journal of Heat Transfer 113, no. 2 (1991): 400–406. http://dx.doi.org/10.1115/1.2910575.

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A study has been made of the heat transfer, flow, and particle deposition relative to the modified chemical vapor deposition (MCVD) process. The effects of variable properties, buoyancy, and tube rotation have been included in the study. The resulting three-dimensional temperature and velocity fields have been obtained for a range of conditions. The effects of buoyancy result in asymmetric temperature and axial velocity profiles with respect to the tube axis. Variable properties cause significant variations in the axial velocity along the tube and in the secondary flow in the region near the t

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21

Leão, Gonçalo, Carlos M. Costa, Armando Sousa, and Germano Veiga. "Detecting and Solving Tube Entanglement in Bin Picking Operations." Applied Sciences 10, no. 7 (2020): 2264. http://dx.doi.org/10.3390/app10072264.

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Manufacturing and production industries are increasingly turning to robots to carry out repetitive picking operations in an efficient manner. This paper focuses on tackling the novel challenge of automating the bin picking process for entangled objects, for which there is very little research. The chosen case study are sets of freely curved tubes, which are prone to occlusions and entanglement. The proposed algorithm builds a representation of the tubes as an ordered list of cylinders and joints using a point cloud acquired by a 3D scanner. This representation enables the detection of occlusio

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22

Sivathanu, Y. R., and J. P. Gore. "Effects of Surface Properties on Radiative Transfer in a Cylindrical Tube With a Nonparticipating Medium." Journal of Heat Transfer 119, no. 3 (1997): 495–501. http://dx.doi.org/10.1115/1.2824123.

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Radiative heat transfer inside a cylindrical tube is modeled using a statistical method called the discrete probability function (DPF) method. The DPF method involves solution of the equation of radiative heat transfer using Lagrangian simulations of representative photon trajectories on a discrete spatial grid. The DPF method is different from the Markov Chain method in terms of associating a probability with each state of the photon rather than a transition from one state to another. The advantages and disadvantages of the DPF method in comparison to the Markov Chain method are demonstrated

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23

Sakamoto, Hitoshi, Yuji Takakuwa, Toyokazu Hori, Yoshiharu Enta, Hiroo Kato, and Nobuo Miyamoto. "Development of a three-electrode-lens drift tube for time-of-flight mass spectrometry." Journal of Synchrotron Radiation 5, no. 3 (1998): 612–14. http://dx.doi.org/10.1107/s0909049597019390.

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A three-electrode-lens drift tube for time-of-flight mass spectrometry (TOF-MS) has been developed for utilizing a detector to observe photon-stimulated desorption (PSD). In spite of a small detection area, the detector has a high detection efficiency and durability to reactive gas atmosphere at high pressure. The TOF-MS performance of the drift tube was examined for PSD using single-bunch-mode synchrotron radiation on a dichlorosilane (SiH2Cl2)-saturated Si(001) surface. The measured acceleration and focusing-voltage dependences of the time of flight, intensity and full width at half-maximum

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24

Behnia, Masud, L. A. Amoroso, and R. A. Platfoot. "VISUALIZATION OF FLY ASH PARTICLE TRAJECTORIES WITHIN A BOILER TUBE BANK MODEL." Journal of Flow Visualization and Image Processing 3, no. 1 (1996): 91–107. http://dx.doi.org/10.1615/jflowvisimageproc.v3.i1.70.

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25

Lin, Weiyao, Yang Zhou, Hongteng Xu, et al. "A Tube-and-Droplet-Based Approach for Representing and Analyzing Motion Trajectories." IEEE Transactions on Pattern Analysis and Machine Intelligence 39, no. 8 (2017): 1489–503. http://dx.doi.org/10.1109/tpami.2016.2608884.

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26

Krueger, Paul S. "Circulation and trajectories of vortex rings formed from tube and orifice openings." Physica D: Nonlinear Phenomena 237, no. 14-17 (2008): 2218–22. http://dx.doi.org/10.1016/j.physd.2008.01.004.

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27

Forney, L. J., Z. Feng, and X. Wang. "Jet Trajectories of Transverse Mixers at Arbitrary Angle in Turbulent Tube Flow." Chemical Engineering Research and Design 77, no. 8 (1999): 754–58. http://dx.doi.org/10.1205/026387699526737.

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28

Ivchenko, Anastasia Yurievna, Alexey Alexeevich Kislitsyn, and Yurii Nikolaevich Orlov. "SIR distribution for dynamical system trajectories on the example of underground tube." Keldysh Institute Preprints, no. 155 (2018): 1–21. http://dx.doi.org/10.20948/prepr-2018-155.

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29

Guo, Zipeng, Jianbo Li, Yintang Liang, Xiaofei Long, Xiaofeng Lu, and Dongke Zhang. "A Numerical Simulation Study into the Effect of Longitudinal and Transverse Pitch on Deposition of Zhundong Coal Ash on Tube Bundles." Processes 12, no. 1 (2024): 178. http://dx.doi.org/10.3390/pr12010178.

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In this paper, the dynamic deposition behavior of Na-enriching Zhundong coal ash on tube bundles with varying longitudinal and transverse pitches was numerically studied. By using a modified critical viscosity model, an improved CFD deposition model has been established and key parameters, including deposit mass and morphology, particle trajectories and impaction and sticking probabilities, as well as the heat flux distribution, have been analyzed. The results show that the ash deposited on tubes in the first row is, respectively, 1.74 and 3.80 times higher than that on the second and third ro

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30

Snyder, J. M., and J. F. Wilson. "Dynamics of the Elastica With End Mass and Follower Loading." Journal of Applied Mechanics 57, no. 1 (1990): 203–8. http://dx.doi.org/10.1115/1.2888305.

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Orthotropic, polymeric tubes subjected to internal pressure may undergo large deformations while maintaining linear moment-curvature behavior. Such tubes are modeled herein as inertialess, elastic cantilever beams (the elastica) with a payload mass at the tip and with internal pressure as the eccentric tip follower loading that drives the configurations through large deformations. From the nonlinear equations of motion, dynamic beam trajectories are calculated over a range of system parameters for the special case of a point mass at the tip and a terminated ramp pressure loading. The dynamic r

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31

Zhu, L., E. Lauga, and L. Brandt. "Low-Reynolds-number swimming in a capillary tube." Journal of Fluid Mechanics 726 (May 31, 2013): 285–311. http://dx.doi.org/10.1017/jfm.2013.225.

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AbstractWe use the boundary element method to study the low-Reynolds-number locomotion of a spherical model microorganism in a circular tube. The swimmer propels itself by tangential or normal surface motion in a tube whose radius is of the order of the swimmer size. Hydrodynamic interactions with the tube walls significantly affect the average swimming speed and power consumption of the model microorganism. In the case of swimming parallel to the tube axis, the locomotion speed is always reduced (respectively, increased) for swimmers with tangential (respectively, normal) deformation. In all

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32

Jiang, W. "A New Constitutive Model in the Theory of Plasticity—Part II: Examples." Journal of Pressure Vessel Technology 117, no. 4 (1995): 371–77. http://dx.doi.org/10.1115/1.2842138.

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This part of the paper presents several examples to further demonstrate the hardening model proposed in the first part of the paper. Closed-form solutions are achieved for a thin-walled tube subjected to linear, rectangular, and circular loading paths, and the corresponding yield center loci and plastic strain trajectories are illustrated. The features of this model are further discussed.

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Beavers, J., K. Huddleston, N. Hines, and W. McNeil. "Modeling electron transport and multiplication in photomultiplier tubes using COMSOL Multiphysics^®." Journal of Instrumentation 17, no. 12 (2022): P12015. http://dx.doi.org/10.1088/1748-0221/17/12/p12015.

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Abstract Combining stochastic and finite element methods, a modeling approach was executed that will inform new photomultiplier tube and scintillation detector designs. Time-dependent signal formation within a commercially available photomultiplier tube was modeled including the release and transport of electrons from the photocathode through the dynode stages. An ET Enterprises 9214B photomultiplier tube was digitally reproduced using Computed Tomography, X-ray radiography, and SolidWorks solid-modeling software. Simulations were executed with COMSOL Multiphysics® finite element solving packa

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Kulesa, P., M. Bronner-Fraser, and S. Fraser. "In ovo time-lapse analysis after dorsal neural tube ablation shows rerouting of chick hindbrain neural crest." Development 127, no. 13 (2000): 2843–52. http://dx.doi.org/10.1242/dev.127.13.2843.

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Previous analyses of single neural crest cell trajectories have suggested important roles for interactions between neural crest cells and the environment, and amongst neural crest cells. To test the relative contribution of intrinsic versus extrinsic information in guiding cells to their appropriate sites, we ablated subpopulations of premigratory chick hindbrain neural crest and followed the remaining neural crest cells over time using a new in ovo imaging technique. Neural crest cell migratory behaviors are dramatically different in ablated compared with unoperated embryos. Deviations from n

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Morse, T. F., C. Y. Wang, and J. W. Cipolla. "Laser-Induced Thermophoresis and Particulate Deposition Efficiency." Journal of Heat Transfer 107, no. 1 (1985): 155–60. http://dx.doi.org/10.1115/1.3247372.

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The interaction of laser radiation and an absorbing aerosol in a tube flow has been considered. The aerosol is produced by external heating of reactants as in the MCVD (Modified Chemical Vapor Deposition) process to produce submicron size particles in the manufacture of optical fiber preforms. These particles are deposited by thermophoretic forces on the inner wall of the tube as they are convected by a Poiseuille velocity profile. Axial laser radiation in the tube interacts with the absorbing particles, and the laser heating of the gas induces additional thermophoretic forces that markedly in

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36

Maramizonouz, S., and S. Nadimi. "Regulating Sand Trajectories in Air Jet Flow Using Particle Morphology." IOP Conference Series: Earth and Environmental Science 1480, no. 1 (2025): 012051. https://doi.org/10.1088/1755-1315/1480/1/012051.

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Abstract The particles encountered daily in nature, science, and industries are rarely shaped spherical or even regular. The irregular morphologies of these particles play a crucial role in their dynamic behaviour and movement which presents a potential to control particle’s trajectories by modifying their morphologies. Here, a jet of air transferring a multitude of irregular particles is numerically modelled as the particles flow through a cylindrical tube, exit the nozzle, and are entrained at a certain spot. For this purpose, a Discrete Element Method (DEM) model is one-way coupled to a Com

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Fitzsimmons, Eric J., Reginald R. Souleyrette, and Shashi S. Nambisan. "Measuring Horizontal Curve Vehicle Trajectories and Speed Profiles: Pneumatic Road Tube and Video Methods." Journal of Transportation Engineering 139, no. 3 (2013): 255–65. http://dx.doi.org/10.1061/(asce)te.1943-5436.0000501.

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CHANDRA, A., A. BHATTACHARYA, and B. CHAKRABARTI. "HEAVY PENTAQUARKS AND DOUBLY HEAVY BARYONS IN QUASIPARTICLE APPROACH." Modern Physics Letters A 27, no. 01 (2012): 1250006. http://dx.doi.org/10.1142/s021773231250006x.

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In the framework of the quasiparticle approach, the ground state mass of heavy pentaquarks have been investigated in diquark–diquark–antiquark picture and the higher states are investigated in the mass loaded flux tube model where two light diquarks are supposed to be linked by a flux tube to the heavy quark. The Regge trajectories for heavy pentaquarks have been studied. The Regge slope (α) of these particles have been obtained as ≈1 GeV2 which indicates that the Regge trajectory follows the linearity conditions with universal value of α (~ 1 GeV2). The ground state mass of doubly charm and d

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Vyskrebtsov, V. G. "Possibility for finding of a common solution for Navier-Stokes equations." Izvestiya MGTU MAMI 6, no. 2-2 (2012): 270–77. http://dx.doi.org/10.17816/2074-0530-68538.

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The paper considers equations of a particle of a Newtonian fluid motion (equations of Navier-Stokes) in a vector form. The equality to zero of a rotor of the gradient is used, so it allows to move to one vector equation only by the speed and rotor speed. This equation contains the linear and quadratic terms. On the basis of the observations of the trajectories of the liquids flow in leakage from the tank through a tube, the trajectories of the flow does not change when fluid consumption changes, the conclusion is that with a change in flow velocity the equality of quadratic and linear parts of

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40

Kohutova, P., E. Verwichte, and C. Froment. "First direct observation of a torsional Alfvén oscillation at coronal heights." Astronomy & Astrophysics 633 (January 2020): L6. http://dx.doi.org/10.1051/0004-6361/201937144.

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Context. Torsional Alfvén waves are promising candidates for the transport of energy across different layers of the solar atmosphere. They have been predicted theoretically for decades. Previous detections of Alfvén waves so far have however mostly relied on indirect signatures. Aims. We present the first direct observational evidence of a fully resolved torsional Alfvén oscillation of a large-scale structure occurring at coronal heights. Methods. We analysed IRIS imaging and spectral observation of a surge resulting from magnetic reconnection between active region prominence threads and surro

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Davison, James, Melissa Pritchard, Emma Footitt, Paul Gissen, Mildrid Yeo, and Maureen Cleary. "Mucolipidosis type II growth trajectories and requirement for enteral tube feeding: A single centre review." Molecular Genetics and Metabolism 135, no. 2 (2022): S35. http://dx.doi.org/10.1016/j.ymgme.2021.11.077.

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Wen, Zhifei, Rebecca Fahrig, Steven Conolly, and Norbert J. Pelc. "Investigation of electron trajectories of an x-ray tube in magnetic fields of MR scanners." Medical Physics 34, no. 6Part1 (2007): 2048–58. http://dx.doi.org/10.1118/1.2733798.

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Ge, Man, and Gaoan Zheng. "Fluid–Solid Mixing Transfer Mechanism and Flow Patterns of the Double-Layered Impeller Stirring Tank by the CFD-DEM Method." Energies 17, no. 7 (2024): 1513. http://dx.doi.org/10.3390/en17071513.

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The optimization design of the double-layered material tank is essential to improve the material mixing efficiency and quality in chemical engineering and lithium battery production. The draft tube structure and double-layered impellers affect the flow patterns of the fluid–solid transfer process, and its flow pattern recognition faces significant challenges. This paper presents a fluid–solid mixing transfer modeling method using the CFD-DEM coupling solution method to analyze flow pattern evolution regularities. A porous-based interphase coupling technology solved the interphase force and cou

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Sugihara-Seki, Masako. "The motion of an ellipsoid in tube flow at low Reynolds numbers." Journal of Fluid Mechanics 324 (October 10, 1996): 287–308. http://dx.doi.org/10.1017/s0022112096007926.

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The motion of a rigid ellipsoidal particle freely suspended in a Poiseuille flow of an incompressible Newtonian fluid through a narrow tube is studied numerically in the zero-Reynolds-number limit. It is assumed that the effect of inertia forces on the motion of the particle and the fluid can be neglected and that no forces or torques act on the particle. The Stokes equation is solved by a finite element method for various positions and orientations of the particle to yield the instantaneous velocity of the particle as well as the flow field around it, and the particle trajectories are determi

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Jabari, Mohammad, Manizhe Zakeri, Farrokh Janabi-Sharifi, and Somayeh Norouzi-Ghazbi. "Inverse Kinematics of Concentric Tube Robots in the Presence of Environmental Constraints." Applied Bionics and Biomechanics 2021 (August 14, 2021): 1–12. http://dx.doi.org/10.1155/2021/4107732.

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Inverse kinematics (IK) of concentric tube continuum robots (CTRs) is associated with two main problems. First, the robot model (e.g., the relationship between the configuration space parameters and the robot end-effector) is not linear. Second, multiple solutions for the IK are available. This paper presents a general approach to solve the IK of CTRs in the presence of constrained environments. It is assumed that the distal tube of the CTR is inserted into a cavity while its proximal end is placed inside a tube resembling the vessel enabling the entry to the organ cavity. The robot-tissue int

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Rossi, M., J. H. Joergensen, and H. Bruus. "Characterization Of Acoustofluidic Geometric Traps By Means Of Defocus Particle Tracking." Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 20 (July 11, 2022): 1–6. http://dx.doi.org/10.55037/lxlaser.20th.149.

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In this work we used the General Defocusing Particle Tracking method to measure the three-dimensional trajectories of 10-μm-diameter polystyrene beads moving inside a micro-acoustofluidic device. The aim is to measure the change in acoustic energy density induced by localized modifications of the channel geometry. The measurements were performed in a glass capillary tube with a rectangular cross-section of 2.0 mm × 0.2 mm. The wall thickness of the capillary tube is 140 μm and it was locally increased by gluing a glass slide with a thickness of 100 μm. The acoustic energies at five different f

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Eckert, Mark A., Shawn Pan, Kyle M. Hernandez, et al. "Genomics of Ovarian Cancer Progression Reveals Diverse Metastatic Trajectories Including Intraepithelial Metastasis to the Fallopian Tube." Cancer Discovery 6, no. 12 (2016): 1342–51. http://dx.doi.org/10.1158/2159-8290.cd-16-0607.

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Demiray, Hilmi. "Interactions of Nonlinear Waves in Fluid-Filled Elastic Tubes." Zeitschrift für Naturforschung A 62, no. 1-2 (2007): 21–28. http://dx.doi.org/10.1515/zna-2007-1-204.

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In this work, treating an artery as a prestressed thin-walled elastic tube and the blood as an inviscid fluid, the interactions of two nonlinear waves propagating in opposite directions are studied in the longwave approximation by use of the extended PLK (Poincaré-Lighthill-Kuo) perturbation method. The results show that up to O(k3), where k is the wave number, the head-on collision of two solitary waves is elastic and the solitary waves preserve their original properties after the interaction. The leading-order analytical phase shifts and the trajectories of two solitons after the collision a

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SONG, YI, STEPHEN P. BANKS, and DAVID DIAZ. "DYNAMICAL SYSTEMS ON THREE MANIFOLDS PART I: KNOTS, LINKS AND CHAOS." International Journal of Bifurcation and Chaos 17, no. 06 (2007): 2073–84. http://dx.doi.org/10.1142/s0218127407018221.

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In this paper, we give an explicit construction of dynamical systems (defined within a solid torus) containing any knot (or link) and arbitrarily knotted chaos. The first is achieved by expressing the knots in terms of braids, defining a system containing the braids and extending periodically to obtain a system naturally defined on a torus and which contains the given knotted trajectories. To get explicit differential equations for dynamical systems containing the braids, we will use a certain function to define a tube neighborhood of the braid. The second one, generating chaotic systems, is r

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Grevcev A. S., Zolotukhin P. A., Il’ichev E. A., Petrukhin G. N., Popov A. V., and Rychkov G. S. "An investigation of reading thermal images processes by a thermal image receiver made in the image intensifier tube architecture." Technical Physics 92, no. 5 (2022): 545. http://dx.doi.org/10.21883/tp.2022.05.53669.338-21.

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The results of calculations of electric fields, potentials, and trajectories of photoelectrons calculations of single-channel dual-spectral thermal imager, implemented in the IIT architecture are presented. The values of the optimal potentials on the control electrodes (microchannel plate, reading electrode, and photocathode) that form a picture of the images of objects and ensure the correct reading of the potential relief from the surface of the sensor-converter pyroelectric film of the image thermal receiver under discussion are determined. Keywords: image intensifier tube, spontaneous pola

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