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Journal articles on the topic 'Two stage rotation'

Author: Grafiati

Published: 8 September 2023

Last updated: 31 July 2025

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1

Liu, Yang. "Rotational movement of Chinese dance based on the analysis of kinematic mechanics." Molecular & Cellular Biomechanics 21, no. 1 (2024): 128. http://dx.doi.org/10.62617/mcb.v21i1.128.

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Objective: Rotation is a fundamental movement in Chinese dance, and many dancers are difficult to control the smoothness and stability of their movements during rotation, resulting in low completion rates. To better grasp the key points of rotational movements, this article started from a biomechanical perspective and studied the differences in completing rotational movements among dancers of different skill levels. Methods: Twenty dancers were divided into group A (high level) and group B (ordinary level). The dancers’ movements were recorded using two Casio cameras and analyzed using the APA

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Powers, Michael E. "Rotator Cuff Training for Pitchers." Journal of Sport Rehabilitation 7, no. 4 (1998): 285–99. http://dx.doi.org/10.1123/jsr.7.4.285.

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This paper reviews the role of the rotator cuff during two key phases of the pitching sequence and presents a training program for these muscles. The program uses a periodization design consisting of three stages, beginning with a high-resistance/low-repetition eccentric strengthening stage. This is followed by a low-resistance/high-repetition stage for training muscular endurance. The core exercises for these two stages are prone external rotation in the 90/90 position, prone horizontal abduction, side-lying D2 flexion pattern, supine internal rotation in the 90/90 position, prone elevation w

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Alkadhimi, Aslam. "A novel and simple technique for correcting localised rotations in the early alignment stage." Journal of Orthodontics 47, no. 4 (2020): 338–44. http://dx.doi.org/10.1177/1465312520949553.

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Correcting severe tooth rotations can be challenging. There are many ways to de-rotate teeth with fixed or removable appliances. Mechanically, the best and most effective way is one that produces a two-force couple system to rotate a tooth around its centre of rotation (longitudinal axis). The aim of this article was to introduce a simple and efficient technique using a closed coil to correct localised tooth rotations in the early alignment stage, utilising a simple two-force couple system. Furthermore, some of the biomechanical principles concerning de-rotation will be revisited.

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Panov, V. F., O. V. Sandakova, E. V. Kuvshinova, and D. M. Yanishevsky. "Evolution of the Universe with two rotating fluids." International Journal of Modern Physics A 35, no. 02n03 (2020): 2040042. http://dx.doi.org/10.1142/s0217751x20400424.

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An anisotropic cosmological model with expansion and rotation and the Bianchi type IX metric has been constructed within the framework of general relativity theory. The first inflation stage of the Universe filled with a scalar field and an anisotropic fluid is considered. The model describes the Friedman stage of cosmological evolution with subsequent transition to accelerated exponential expansion observed in the present epoch. The model has two rotating fluids: the anisotropic fluid and dust-like fluid. In the approach realized in the model, the anisotropic fluid describes the rotating dark

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Ito, Yoichiro. "Two-phase Motion in Hydrodynamic Counter-current Chromatography." Current Chromatography 7, no. 2 (2020): 76–81. http://dx.doi.org/10.2174/2213240606666190912161221.

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Background: Motion of the two mutually immiscible liquids in hydrodynamic countercurrent chromatographic systems is speculated based on the observation of their behavior in a closed coiled tube rotating in unit gravity. Materials and Methods: The experiment revealed an up and down pattern of four stages of twophase volume ratio occupied at the head end of the coil according to the rotation speed. These two-phase behaviors are comprehensively explained on the bases of interplay between the unit gravity and centrifugal force generated by rotation of the coil. This theory is successfully extended

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Wang, Caidong, Pengfei Gao, Xinjie Wang, Hong Wang, Xiaoli Liu, and Huadong Zheng. "Mechanical Design and Experiments of a New Rotational Variable Stiffness Actuator for Hybrid Passive–Active Stiffness Regulation." Actuators 12, no. 12 (2023): 450. http://dx.doi.org/10.3390/act12120450.

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To improve collision safety in robot–human collaborative applications, increasing attention has been paid to rotational variable stiffness actuators. A new rotational variable stiffness actuator, which works in two stages, is proposed for hybrid passive–active stiffness regulation. The passive stage is based on the motions of springs driven by the rack-and-pinion systems, elastically converting the shaft’s rotation into the inner shell rotation fixed to the internal gear of the active stage. The active stage is designed to achieve the movement of the pivot point located on the roller actuated

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Wei, Zhicong, Wei Yang, and Ruofu Xiao. "Pressure Fluctuation and Flow Characteristics in a Two-Stage Double-Suction Centrifugal Pump." Symmetry 11, no. 1 (2019): 65. http://dx.doi.org/10.3390/sym11010065.

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Pressure fluctuation is the primary factor that affects the stability of turbomachines. The goal of the present work is to explore the propagation of pressure fluctuations in a two-stage double-suction centrifugal pump. The pressure fluctuation characteristics of each component of a two-stage double-suction centrifugal pump are simulated under four typical flow rates based on the SST k-ω turbulence model. It is shown that the pressure fluctuation frequency at blade passing frequency and its first harmonic is the same at the suction chamber, the leading edge, and the middle of the first-stage i

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Luan, Hengxuan, Liyuan Weng, Ranhui Liu, Dongmin Li, and Mingwei Wang. "Axial Spacing Effects on Rotor-Rotor Interaction Noise and Vibration in a Contra-Rotating Fan." International Journal of Aerospace Engineering 2019 (February 7, 2019): 1–15. http://dx.doi.org/10.1155/2019/2125976.

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Because of the potential technical advantages, the contra-rotation technology has become a renewed interest in aviation and other applications. Contra-rotation increases efficiency in comparison with the single-rotor design, but this advantage is not fully harnessed. The axial spacing of two-stage contra-rotating blade rows has a significant impact on a contra-rotating fan/compressor. The results show that with a contra-rotation pattern, the strong unsteadiness of two-stage rotors is caused by the rotor-rotor interaction. The unsteadiness of rotor 1 is caused by the potential disturbance, and

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Ye, Tingting, and Yangmin Li. "Synthesis of 2-DOF Decoupled Rotation Stage with FEA-Based Neural Network." Processes 11, no. 1 (2023): 192. http://dx.doi.org/10.3390/pr11010192.

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Transfer printing technology has developed rapidly in the last decades, offering a potential demand for 2-DOF rotation stages. In order to remove decoupling modeling, improve motion accuracy, and simplify the control method, the 2-DOF decoupled rotation stages based on compliant mechanisms present notable merits. Therefore, a novel 2-DOF decoupled rotation stage is synthesized of which the critical components of decoupling are the topological arrangement and a novel decoupled compound joint. To fully consider the undesired deformation of rigid segments, an FEA-based neural network model is uti

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Franchuk, Vsevolod, Oleksandr Antsiferov, and Anastasiia Shkut. "Dynamics of a vibrating screen with two motor-vibrators." IOP Conference Series: Earth and Environmental Science 1348, no. 1 (2024): 012063. http://dx.doi.org/10.1088/1755-1315/1348/1/012063.

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Abstract A method for calculating a vibrating screen with two motor vibrators is proposed. The first part of the article is devoted to the issue of synchronizing the rotation of the rotors of both drives. Their opposite rotation creates a directed force passing through the center of gravity of the screen and perpendicular to the plane of the vibrator axes. The interaction of forces in this plane determines the phase mismatch of the rotation angles of the vibrators θ. An expression is obtained for determining the angle θ depending on the frequency of their rotation vibrators ω. It is shown that

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11

Zhang, Zi Miao, Shi Hai Zhang, and Ya Nan Yu. "Study on Axis Calibration Method of the Coordinate Measurement System Based on Binocular Vision." Advanced Materials Research 989-994 (July 2014): 3266–69. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.3266.

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For a coordinate measurement system based on binocular vision, system calibration is an important factor for measurement accuracy. In this paper we present a flexible calibration method for the axis calibration of rotation stage which is installed in front of the binocular vision system to increase the system measurement range. By putting a standard ball in front of the binocular vision system, a sequence of pictures is taken by the two cameras with a few different rotation angles of the rotation stage. With the method of space intersection of two straight lines, the reference points (the ball

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Malael, I., and V. Dragan. "Numerical and Experimental Efficiency Evaluation of a Counter-Rotating Vertical Axis Wind Turbine." Engineering, Technology & Applied Science Research 8, no. 4 (2018): 3282–86. http://dx.doi.org/10.48084/etasr.2231.

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This paper investigates the concept of a concentric counter-rotating vertical axis wind turbine (VAWT), consisting of a two stage vertical H-type turbine with three blades on each stage. The model has an inner and an outer stage, rotating in opposition to each other. Both numerical and experimental tests have been performed in order to validate this new concept. Numerical analysis is based on the use of 2.5-dimensional, unsteady simulations using a DOF type of analysis which allows for the two stages to self-adjust their rotation speed. Sliding mesh conformal interfaces are defined between the

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Malael, Ion, and Valeriu Dragan. "Numerical and Experimental Efficiency Evaluation of a Counter-Rotating Vertical Axis Wind Turbine." Engineering, Technology & Applied Science Research 8, no. 4 (2018): 3282–86. https://doi.org/10.5281/zenodo.1450711.

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This paper investigates the concept of a concentric counter-rotating vertical axis wind turbine (VAWT), consisting of a two stage vertical H-type turbine with three blades on each stage. The model has an inner and an outer stage, rotating in opposition to each other. Both numerical and experimental tests have been performed in order to validate this new concept. Numerical analysis is based on the use of 2.5-dimensional, unsteady simulations using a DOF type of analysis which allows for the two stages to self-adjust their rotation speed. Sliding mesh conformal interfaces are defined between the

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14

Gurney, Kevin, and Michael J. Wright. "Rotation and Radial Motion Thresholds Support a Two-Stage Model of Differential-Motion Analysis." Perception 25, no. 1 (1996): 5–26. http://dx.doi.org/10.1068/p250005.

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Lower motion thresholds for rotational and radial flow have been measured for stimuli consisting of four closely packed circular apertures, each containing patches of drifting grating or plaid. Detection and direction thresholds were measured for gratings and plaids as a function of the relative orientation of the pattern components. There was a similarity between both types of threshold, supporting the existence of specialised rotation and radial-flow detectors. Further, thresholds increased with the relative component orientation for both gratings and plaids. This suggests that component inf

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15

Zhang, Lei, and Abraham Engeda. "Numerical simulation of rotating stall in a two-stage axial fan." Thermal Science 22, Suppl. 2 (2018): 655–63. http://dx.doi.org/10.2298/tsci171025050z.

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Computational fluid dynamics calculations using high-performance parallel computing were conducted to simulate the prestall flow of a two-stage axial fan. The simulations were run with a full-annulus grid that models the 3-D, viscous, unsteady blade row interaction without the need for an artificial inlet distortion to induce stall. The simulation shows the initiation and development of the stall inception in two rotors of the axial fan. The results show that the stall inception first occurs in the second stage. The spike-type stall inception occurred in the second stage, which is different fr

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16

Guo, Zhengyan, Yan Lu, Jingtao Yuan, Pimin Chen, Qibin Zhang, and Wei Fan. "The Effects of Pilot Structure on the Lean Ignition Characteristics of the Internally Staged Combustor." Energies 18, no. 2 (2025): 349. https://doi.org/10.3390/en18020349.

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In order to explore the influence of pilot structure on the lean ignition characteristics in a certain type of internally staged combustor, the current study was conducted on the effects of the auxiliary fuel nozzle diameter, the rotating direction of the pilot swirler, and the swirl number on the lean ignition fuel–gas ratio limit, combining numerical simulation and experimental validation. The optimization potential of the mixing structure of this type of internally staged combustor was further explored. It indicated that the lean ignition fuel–gas ratio limit was significantly influenced by

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17

Chai, Fu Jun, Jin You Xu, and Ying Xu. "Kinematics Simulation of Steel Tube Rotating Mechanism Based on ADAMS." Applied Mechanics and Materials 130-134 (October 2011): 2647–50. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.2647.

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Taking a new steel tube rotating mechanism as the research object, the model is simplified and the virtual prototyping model of the mechanism is established. The mechanism kinematics simulation is carried out with ADAMS simulation software. The motion law and state in two conditions are comparatively analyzed. Analysis results show that, in steel tube clamping stage the motion of the clip rod is of variable deceleration; And in rotating stage, mechanism is of accelerated rotation with variable acceleration when the cylinder input, while mechanism is of uniform rotation when the crank input； An

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18

Alfredsson, P. Henrik, and Håkan Persson. "Instabilities in channel flow with system rotation." Journal of Fluid Mechanics 202 (May 1989): 543–57. http://dx.doi.org/10.1017/s002211208900128x.

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A flow visualization study of instabilities caused by Coriolis effects in plane rotating Poiseuille flow has been carried out. The primary instability takes the form of regularly spaced roll cells aligned in the flow direction. They may occur at Reynolds numbers as low as 100, i.e. almost two orders of magnitude lower than the critical Reynolds number for Tollmien-Schlichting waves in channel flow without rotation. The development of such roll cells was studied as a function of both the Reynolds number and the rotation rate and their properties compared with results from linear spatial stabili

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19

Oktaria, Tri, Ratu Ilma Indra Putri, Zulkardi Zulkardi, Ely Susanti, and Budi Mulyono. "Hypothetical Learning Trajectory Design On Rotation Topic Using Photography Context." Jurnal Didaktik Matematika 12, no. 1 (2025): 111–29. https://doi.org/10.24815/jdm.v12i1.42985.

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This research aims to design a learning trajectory on rotation topic using photography context for junior high school students. The method used in this study is design research, with 3 stages, namely the preliminary design stage, the design experiment stage and the retrospective analysis stage. This study uses the Indonesian Realistic Mathematics Education (PMRI) learning approach. The Hypothetical Learning Trajectory (HLT) design is made through learning activities using a photography context. The research subjects were grade IX students of SMP Bina Warga Palembang. The results of this resear

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20

Alekhnovich, V. I., M. Yu Chetvernin, and A. F. Shirankov. "OPTICAL METHOD FOR MEASURING RUNOUT PARAMETERS AXIS OF THE PART RELATIVE TO THE AXIS OF ROTATION." Kontrol'. Diagnostika, no. 270 (December 2020): 50–56. http://dx.doi.org/10.14489/td.2020.12.pp.050-056.

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The article is devoted to the development of an optical method and a device for measuring the runout parameters of a part relative to the axis of its rotation. A graphical diagram is provided to indicate and explain all the runout parameters of rotating part. It is shown that these parameters can be determined by the optical method using the visualization of the rotation axis and the inertia axis of the part by a collimated laser beam. The process of measuring these parameters consists of two stages. In the first stage, the inertia axis of the part is aligned with the axis of the laser beam, a

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21

Bouchaud, K., A. Domiciano de Souza, M. Rieutord, D. R. Reese, and P. Kervella. "A realistic two-dimensional model of Altair." Astronomy & Astrophysics 633 (January 2020): A78. http://dx.doi.org/10.1051/0004-6361/201936830.

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Context. Fast rotation is responsible for important changes in the structure and evolution of stars and the way we see them. Optical long baseline interferometry now allows for the study of its effects on the stellar surface, mainly gravity darkening and flattening. Aims. We aim to determine the fundamental parameters of the fast-rotating star Altair, in particular its evolutionary stage (represented here by the core hydrogen mass fraction Xc), mass, and differential rotation, using state-of-the-art stellar interior and atmosphere models together with interferometric (ESO-VLTI), spectroscopic,

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Trilis, Artem. "Modeling Of Transverse Detonation Waves In A Flat-Radial Annular Channel." Siberian Journal of Physics 12, no. 2 (2017): 60–65. http://dx.doi.org/10.54362/1818-7919-2017-12-2-60-65.

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Acoustic properties of two regions of gases with different temperatures arising at the initial stage of evolution of transverse detonation waves in annular channel were examined. Mechanics of acoustic vibrations and waves are studied using both numeric and analytical and methods. Rotating circumferential waves at boundary surface of two gases with different temperatures were discovered and rotation velocities of these waves were determined.

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Pun, C. M., and M. C. Lee. "Rotation-invariant texture classification using a two-stage wavelet packet feature approach." IEE Proceedings - Vision, Image, and Signal Processing 148, no. 6 (2001): 422. http://dx.doi.org/10.1049/ip-vis:20010705.

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Choi, Min-Seok, and Whoi-Yul Kim. "A novel two stage template matching method for rotation and illumination invariance." Pattern Recognition 35, no. 1 (2002): 119–29. http://dx.doi.org/10.1016/s0031-3203(01)00025-5.

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Tretiak, Oleksii, Anton Kovryga, Stanislav Kravchenko, et al. "Estimating the influence of the rigidity of support assemblies on the resonance phenomena and the vibration state of a hydraulic unit." Eastern-European Journal of Enterprise Technologies 6, no. 7 (132) (2024): 53–64. https://doi.org/10.15587/1729-4061.2024.316778.

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Many factors affect the vibration of the hydraulic unit, including the natural oscillation frequencies of the structural elements, which in some cases may contribute to an increase in vibration because of the occurrence of resonance phenomena. In this work, the case of design optimization of the support assemblies of the shaft pipeline of the hydrogenerator-motor was considered, installed at HSPP during its reconstruction in order to improve vibration parameters. The effect of increasing the stiffness of the upper crosspiece and reducing the weight of the rotating parts on the value of the fir

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Ahn, Jaeyong, M. T. Schobeiri, Je-Chin Han, and Hee-Koo Moon. "Film Cooling Effectiveness on the Leading Edge Region of a Rotating Turbine Blade With Two Rows of Film Cooling Holes Using Pressure Sensitive Paint." Journal of Heat Transfer 128, no. 9 (2006): 879–88. http://dx.doi.org/10.1115/1.2241945.

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Detailed film cooling effectiveness distributions are measured on the leading edge of a rotating gas turbine blade with two rows (pressure-side row and suction-side row from the stagnation line) of holes aligned to the radial axis using the pressure sensitive paint (PSP) technique. Film cooling effectiveness distributions are obtained by comparing the difference of the measured oxygen concentration distributions with air and nitrogen as film cooling gas respectively and by applying the mass transfer analogy. Measurements are conducted on the first-stage rotor blade of a three-stage axial turbi

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Liao, Che-Wei, Ming-Tzu Tsai, Heng-Li Huang, et al. "Geometrical Calibration of a 2.5D Periapical Radiography System." Applied Sciences 10, no. 3 (2020): 906. http://dx.doi.org/10.3390/app10030906.

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The objective of this study was to develop a geometrical calibration method applicable to the 2.5D prototype Periapical Radiography System and estimate component position errors. A two-steel-ball phantom with a precisely known position was placed in front of a digital X-ray sensor for two-stage calibration. In the first stage, the following three parameters were estimated: (1) r, the distance between the focal spot and the rotation axis of the X-ray tube; (2) ψ, the included angle between the straight line formed by the X-ray tube’s focal spot and rotation axis and the straight line of the ort

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Prokhorenko, A., S. Kravchenko, and E. Solodky. "METHOD OF ORGANIZING TWO-STAGE FUEL INJECTION INTO A DIESEL CYLINDER USING A HYDROMECHANICAL FUEL EQUIPMENT." Internal Combustion Engines, no. 2 (November 15, 2022): 25–32. http://dx.doi.org/10.20998/0419-8719.2022.2.04.

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The use of multiphase injection allows reducing the emission levels with exhaust gases and the noise of diesel engines. This paper proposes to improve the hydromechanical fuel supply system of diesel vehicles by providing the possibility of two-stage fuel supply. This task is solved by high-pressure fuel pump equipment, additionally by high-pressure sections that work to inject fuel for pilot injection. The drive shaft cams of these sections are ahead of the shaft cams of the main sections by 2-10 degrees rotation of the camshaft. In order to check the performance of the proposed two-stage fue

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29

Beck, P. G., T. Kallinger, K. Pavlovski, et al. "Seismic probing of the first dredge-up event through the eccentric red-giant and red-giant spectroscopic binary KIC 9163796." Astronomy & Astrophysics 612 (April 2018): A22. http://dx.doi.org/10.1051/0004-6361/201731269.

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Context. Binaries in double-lined spectroscopic systems (SB2) provide a homogeneous set of stars. Differences of parameters, such as age or initial conditions, which otherwise would have strong impact on the stellar evolution, can be neglected. The observed differences are determined by the difference in stellar mass between the two components. The mass ratio can be determined with much higher accuracy than the actual stellar mass. Aim. In this work, we aim to study the eccentric binary system KIC 9163796, whose two components are very close in mass and both are low-luminosity red-giant stars.

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Stoneham, E., L. Witt, Q. Paterson, L. Martin, and B. Thoma. "P101: The development of entrustable professional activity reference cards to support the implementation of Competence by Design in emergency medicine." CJEM 21, S1 (2019): S100. http://dx.doi.org/10.1017/cem.2019.292.

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Innovation Concept: Competence by Design (CBD) was implemented nationally for Emergency Medicine (EM) residents beginning training in 2018. One challenge is the need to introduce residents to Entrustable Professional Activities (EPAs) that are assessed across numerous clinical rotations. The Royal College's resources detail these requirements, but do not map them to specific rotations or present them in a succinct format. This is problematic as trainees are less likely to succeed when expectations are unclear. We identified a need to create practical resources that residents can use at the bed

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Luo, Tianyin, Hideyuki Umeda, Takashi Yoshida, and Koh Takahashi. "Stellar Models of Betelgeuse Constrained Using Observed Surface Conditions." Astrophysical Journal 927, no. 1 (2022): 115. http://dx.doi.org/10.3847/1538-4357/ac4f5f.

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Abstract We study stellar models for Betelgeuse using the HR diagram and surface abundances as observational constraints. Previous studies on Betelgeuse have not systematically investigated the surface abundances, but we believe they can be impacted by, and thus be used as an observational constraint for various parameters such as initial mass, rotation, and overshoot scheme. We investigate stellar models with varying initial mass as they evolve past the main sequence, and we examine the red supergiant (RSG) properties in detail. For each mass, we vary the initial rotation up to ∼300 km s−1, a

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Song, Lingling, and Yue Chen. "A Prediction Model of Two-Sided Unbalance in the Multi-Stage Assembled Rotor of an Aero Engine." Machines 12, no. 8 (2024): 503. http://dx.doi.org/10.3390/machines12080503.

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In rotating machinery with a multi-stage assembled rotor, such as is found in aero engines, any unbalance present will undergo unknown changes at each stage when rotating the assembly phases of the rotor. Repeated disassembly and adjustments are often required to meet the rotor’s residual unbalance specifications. Therefore, developing a prediction model of this two-sided unbalance for a multi-stage assembled rotor is crucial for improving the first-time assembly pass rate and assembly efficiency. In this paper, we propose a prediction model of the two-sided unbalance seen in the multi-stage a

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Hsu, Ming-Ying, Cheng-Yao Fu, Bo-Yi Chen, Gung-Chian Yin, Hok-Sum Fung, and Shang-Wei Lin. "The white light interferometer stitching measurement stage design for the X-ray mirror." Journal of Physics: Conference Series 3010, no. 1 (2025): 012088. https://doi.org/10.1088/1742-6596/3010/1/012088.

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Abstract The X-ray mirror surface requires high spatial resolution image measurement, a task for which the white light interferometer stitching method is most commonly used in the X-ray optical measurement lab. The measurement stage design, a crucial part of this method, includes two linear axes and two rotation axes, each with specific travel ranges. The 1200 mm travel range axis is the X axis, and the 390 mm travel range axis is the Y axis. The measurement head travel range is 390 mm along the Z axis. The rotation axes are the X-axis and the Y-axis, and each rotation range is ± 1.5 degrees.

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Xu, Weihe, Kenneth Lauer, Yong Chu, and Evgeny Nazaretski. "A high-precision instrument for mapping of rotational errors in rotary stages." Journal of Synchrotron Radiation 21, no. 6 (2014): 1367–69. http://dx.doi.org/10.1107/s160057751401618x.

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A rotational stage is a key component of every X-ray instrument capable of providing tomographic or diffraction measurements. To perform accurate three-dimensional reconstructions, runout errors due to imperfect rotation (e.g.circle of confusion) must be quantified and corrected. A dedicated instrument capable of full characterization and circle of confusion mapping in rotary stages down to the sub-10 nm level has been developed. A high-stability design, with an array of five capacitive sensors, allows simultaneous measurements of wobble, radial and axial displacements. The developed instrumen

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Hazel, Soufyane, Yong Huang, and Mokhtar Ait Amirat. "New single vortex generation method for flame/vortex interaction using flow behind a rotating cylinder." Fluid Dynamics Research 53, no. 6 (2021): 065506. http://dx.doi.org/10.1088/1873-7005/ac4385.

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Abstract This paper investigates a new experimental method to generate a single two-dimensional translated vortex for flame/vortex interaction studies. A rotating cylinder is immersed in a uniform flow and, its rotating speed is impulsively reduced. This sudden action triggers the generation of a single vortex when both the initial and the final rotation speeds are in the range of a steady-state regime. Flow visualization allows confirming the applicability of this method, while a complementary two-dimensional numerical simulation is conducted to understand the vortex formation process. A vort

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Sharma, P. B., Y. P. Jain, and D. S. Pundhir. "A Study of Some Factors Affecting the Performance of a Contra-Rotating Axial Compressor Stage." Proceedings of the Institution of Mechanical Engineers, Part A: Power and Process Engineering 202, no. 1 (1988): 15–21. http://dx.doi.org/10.1243/pime_proc_1988_202_003_02.

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An experimental investigation of the performance of a contra-rotating stage is reported. The influence of factors such as speed ratio of the two rotors, rotor stagger, pitch-chord ratio and axial spacing between the rotors is examined from tests on a 0.66 hub-tip ratio compressor. The study reveals that the performance of a contra-rotating stage is affected by all these factors. Axial spacing between the rotors and the speed ratio of the rotors both exhibit a strong influence on the stalling behaviour of the stage. It has been found that in a stage with close axial gap, rotating stall on the f

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Choi, Kee-Bong, Jaejong Lee, Geehong Kim, Hyungjun Lim, and Soongeun Kwon. "Kinematic Analysis of a Parallel Manipulator Driven by Perpendicular Linear Actuators." Actuators 10, no. 10 (2021): 262. http://dx.doi.org/10.3390/act10100262.

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In this paper, a goniometer-type specimen stage with a linear actuation mechanism mounted on a rotation mechanism is introduced. The linear actuation mechanism was modeled as a spatial parallel manipulator consisting of a moving body, three linear actuators, and an anti-rotation mechanism. The three linear actuators were arranged perpendicular to each other. In the specimen stage, the linear actuators were in ball contact with the surface of a holder designed to hold a specimen. For the parallel manipulator, the ball contact was replaced with two prismatic joints and a spherical joint. The mob

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38

Smith, Robert Connon. "The Evolution of Rapidly Rotating B Stars (Review Paper)." International Astronomical Union Colloquium 92 (August 1987): 486–99. http://dx.doi.org/10.1017/s0252921100116665.

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AbstractBe stars are located in or near the main-sequence band for non-rotating stars. Although this stage of evolution is relatively well understood, there are two main effects that make it impossible to say whether all Be stars are in the same stage of evolution and, if so, what that stage is. One effect is the spread in observed magnitude and colour as a result of rotation. Correction for rotation is not possible because of the unknown inclination of any particular star's rotation axis to the line of sight and because it is not clear what the internal angular momentum distribution is or how

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39

Bezvesilna, Olena, Leonid Kolomiets, Yurii Kyrychuk, and Tetiana Tolochko. "TWO-GYROSCOPIC SENSITIVE ELEMENT OF THE STABILIZATION COMPLEX." Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì, no. 2(23) (2023): 30–39. http://dx.doi.org/10.32684/2412-5288-2023-2-23-30-39.

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The proposed two-gyroscopic SE is designed to measure acceleration and belongs to the area of acceleration measurements on a moving base and can be used in stabilization systems. The purpose of the article is to increase the accuracy of acceleration determination. To do this, it is necessary to eliminate methodical errors of gyroscopic moments-obstacle from the cross angular velocities of the base and from the angular velocity of the Earth's rotation. The proposed two-gyro SE consists of a three-stage gyroscope located in the inner and outer frames, equipped with an inter-frame correction syst

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Lou, Zhi-Feng, Xiu-Peng Hao, Yin-Di Cai, Tien-Fu Lu, Xiao-Dong Wang, and Kuang-Chao Fan. "An Embedded Sensor System for Real-Time Detecting 5-DOF Error Motions of Rotary Stages." Sensors 19, no. 13 (2019): 2855. http://dx.doi.org/10.3390/s19132855.

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The geometric error motions of rotary stages greatly affect the accuracy of constructed machines such as machine tools, measuring instruments, and robots. In this paper, an embedded sensor system for real-time measurement of two radial and three angular error motions of a rotary stage is proposed, which makes use of a rotary encoder with multiple scanning heads to measure the rotational angle and two radial error motions and a miniature autocollimator to measure two tilt angular errors of the axis of rotation. The assembly errors of the grid disc of the encoder and the mirror for autocollimato

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Livernois, Alexander, Enrico Vesperini, Maria Tiongco, Anna Lisa Varri, and Emanuele Dalessandro. "Early dynamics and violent relaxation of multimass rotating star clusters." Monthly Notices of the Royal Astronomical Society 506, no. 4 (2021): 5781–801. http://dx.doi.org/10.1093/mnras/stab2119.

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ABSTRACT We present the results of a study aimed at exploring, by means of N-body simulations, the evolution of rotating multimass star clusters during the violent relaxation phase, in the presence of a weak external tidal field. We study the implications of the initial rotation and the presence of a mass spectrum for the violent relaxation dynamics and the final properties of the equilibria emerging at the end of this stage. Our simulations show a clear manifestation of the evolution towards spatial mass segregation and evolution towards energy equipartition during and at the end of the viole

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Исмагилов, Динар, Dinar Ismagilov, Марат Калимуллин, et al. "EXPERIMENTAL STUDIES OF A TWO-GRADE CHOPPER OF BEETS." Vestnik of Kazan State Agrarian University 14, no. 2 (2019): 100–105. http://dx.doi.org/10.12737/article_5d3e174cf21866.69997219.

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The two-grade rotary chopper BIR-2 of root and tuber crops with flexible working elements is designed to remove the beets of vegetable leaves before or during the harvest of carrots. It is proposed to use it together with an undermining machine in an aggregate with a tractor of the 1.4 kN class of thrust with a front and rear hitch. In this case, the chopper of beets is hung on the front hitch of the power means, and the working units are driven in rotation by hydraulic motors, which allows the two unitized devices to operate independently of each other. Laboratory studies of the effect of rot

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43

Герасимов, М., M. Gerasimov, Н. Воробьев, N. Vorob'ev, В. Иванов, and V. Ivanov. "OPTIMIZATION OF PARAMETERS OF TWO-STAGE VIBRATION MECHANISM WITH ASYMMETRIC OSCILLATIONS BY DYNAMIC COEFFICIENT." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 4, no. 10 (2019): 149–53. http://dx.doi.org/10.34031/article_5db3fdb0e8c532.45857437.

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The mechanisms with asymmetric vibrations is the priority direction of development and creation of vibration devices for technological processes in the coming years. Mechanisms with asymmetric vibrations are constructively created on the basis of vibrators with directional vibrations in the form of steps, which differ from each other in the mass of unbalances, the radius of displacement of the center of mass from the axis of rotation and the frequency of rotation of the unbalanced shaft. The simplest device with asymmetric oscillations is a two-stage mechanism. Optimization of parameters of vi

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Gorelov, Yu N., and L. V. Kurganskaya. "Modeling of kinematic characteristics of a mobile antenna of a spacecraft in a two-stage pivoting device." Vestnik of Samara University. Natural Science Series 29, no. 4 (2023): 125–32. http://dx.doi.org/10.18287/2541-7525-2023-29-4-125-132.

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The problem of calculating the kinematic characteristics of a mobile antenna device (AD) based on the specified values of kinematic characteristics of the line of sight (LS) "spacecraft — information reception point" in the associated coordinate system of the spacecraft is considered. The kinematic characteristics of the AD in the form of the current values of its rotation angles and angular velocities and accelerations (according to the corresponding control channels) are determined from the conditions for combining the LS with the axis of the directional diagram of the AD for the case of a t

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Zakeri, Abdollah, Bikram Koirala, Jiming Kang, et al. "SMS3D: 3D Synthetic Mushroom Scenes Dataset for 3D Object Detection and Pose Estimation." Computers 14, no. 4 (2025): 128. https://doi.org/10.3390/computers14040128.

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The mushroom farming industry struggles to automate harvesting due to limited large-scale annotated datasets and the complex growth patterns of mushrooms, which complicate detection, segmentation, and pose estimation. To address this, we introduce a synthetic dataset with 40,000 unique scenes of white Agaricus bisporus and brown baby bella mushrooms, capturing realistic variations in quantity, position, orientation, and growth stages. Our two-stage pose estimation pipeline combines 2D object detection and instance segmentation with a 3D point cloud-based pose estimation network using a Point T

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Grigoryan, Artyom M. "New Permutation-Free Quantum Circuits for Implementing 3- and 4-Qubit Unitary Operations." Information 16, no. 7 (2025): 621. https://doi.org/10.3390/info16070621.

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The article presents the quantum signal-induced heap transform (QsiHT) method of the QR-decomposition of multi-qubit operations. This transform can be generated by a given signal, by using different paths, or orders, of processing the data. We propose using the concept of the fast path of calculation of the QsiHT and applying such transforms on each stage of the matrix decomposition. This allows us to build quantum circuits for multi-qubit unitary operation without permutations. Unitary operations with real and complex matrices are considered. The cases of 3- and 4-qubit operations are describ

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Heister, S. R., and V. V. Kirichenko. "Method for Two-Stage Radar Measurement of the Blade Repetition Rate of a Propeller-Driven Aircraft." Journal of the Russian Universities. Radioelectronics 27, no. 3 (2024): 68–80. http://dx.doi.org/10.32603/1993-8985-2024-27-3-68-80.

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Introduction. Radar images of aircraft propellers can significantly improve the quality of their recognition and protection against simulating interference. Such images can be obtained using algorithms based on an inverse antenna aperture synthesis. A key factor determining the quality of image acquisition is the accuracy of the rotor blade rotation frequency measurement. In 2019, a method for measuring the blade repetition rate was proposed, which is based on convolution of the "secondary" signal modulation spectrum while simultaneously eliminating the influence of the Doppler frequency of th

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Nosov, S. I., V. V. Garmanov, G. A. Efimova, and V. L. Bogdanov. "Land use of especially valuable irrigated lands of an agricultural enterprise in a land management project." Zemleustrojstvo, kadastr i monitoring zemel' (Land management, cadastre and land monitoring), no. 9 (August 30, 2024): 532–40. https://doi.org/10.33920/sel-04-2409-02.

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The technology of organizing the use of irrigated arable lands, classified as especially valuable, is the subject of the one-stage working draft or working documentation corresponding to an integral part of a two-stage on-farm land management project (second stage), determining the composition and content of the project documentation, design methodology and the relevance of the topic. The purpose of the study is to determine the composition, content and procedure for the development of such working draft or working documentation. Based on this goal, the following main tasks of the working desi

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Ebus, Tobias, Markus Dietz, and Andreas Hupfer. "Experimental and numerical studies on small contra-rotating electrical ducted fan engines." CEAS Aeronautical Journal 12, no. 3 (2021): 559–71. http://dx.doi.org/10.1007/s13272-021-00517-7.

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AbstractElectrical propulsion has been identified as one of the key fields of future research within the aerospace sector. The Institute of Aeronautical Engineering at the Universität der Bundeswehr München aims to contribute to the ongoing development of small-sized electrical ducted fan engines with a thrust in the range of 100 N. A special emphasis is placed on electrically powered contra-rotating fan stages. When compared to a conventional rotor–stator stage, contra-rotating fan stages allow for a more compact design, considering a given pressure ratio, or an increased pressure ratio at a

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50

Prokudin, A. N., and S. V. Firsov. "Elastoplastic deformation of a rotating hollow cylinder with a rigid casing." PNRPU Mechanics Bulletin, no. 4 (December 15, 2019): 120–35. http://dx.doi.org/10.15593/perm.mech/2019.4.12.

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A rotating hollow cylinder with fixed ends is considered, the inner surface of which is free of stresses, and the outer one is fixed from radial movements. It is assumed that the cylinder is made of an ideal isotropic elastoplastic material, and the deformations in it are small and represent the sum of elastic and plastic deformations. Stresses are associated with elastic deformations by Hooke's law. Plastic deformations are determined using the Tresca - Saint-Venant condition and the plastic flow rule associated with it. The cylinder rotation speed first monotonically increases to a maximum v

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