Log in

Relevant bibliographies by topics / Nutation angle / Journal articles

To see the other types of publications on this topic, follow the link: Nutation angle.

Journal articles on the topic 'Nutation angle'

Author: Grafiati

Published: 2 May 2022

Last updated: 30 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Nutation angle.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Herring, T. A. "An a priori model for the reduction of nutation observations: KSV1994.3 nutation series." Highlights of Astronomy 10 (1995): 222–27. http://dx.doi.org/10.1017/s1539299600011060.

Full text

Abstract:

AbstractWe discuss the formulation of a new nutation series to be used in the reduction of modern space geodetic data. The motivation for developing such a series is to develop a nutation series that has smaller short period errors than the IAU 1980 nutation series and to provide a series that can be used with techniques such as the Global Positioning System (GPS) that have sensitivity to nutations but can directly separate the effects of nutations from errors in the dynamical force models that effect the satellite orbits. A modern nutation series should allow the errors in the force models fo

APA, Harvard, Vancouver, ISO, and other styles

2

Mathews, P. M., and T. A. Herring. "Observational and Theoretical Modeling of Nutation." Highlights of Astronomy 11, no. 1 (1998): 177–81. http://dx.doi.org/10.1017/s1539299600020372.

Full text

Abstract:

The IERS nutation series was developed as a nutation series which would match observations and could be used with geodetic systems which have sensitivity to nutations but are not able to determine accurately corrections to the IAU-1980 nutation series. After experimentation with different methods for parameterizing the nutation estimation problem, the best fit to the VLBI observed nutation angle data was found by estimating selected coefficients in the Mathews et al. (1991a) nutation response function (see equation (1) below), along with other parameters to be discussed below. The estimation o

APA, Harvard, Vancouver, ISO, and other styles

3

Hong, Jia-zhen. "Residual nutation angle of satellites with viscous nutation dampers." Acta Astronautica 15, no. 1 (1987): 1–7. http://dx.doi.org/10.1016/0094-5765(87)90060-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Himwich, W. E., and E. J. Harder. "Direct estimation of nutation coefficients from VLBI data." Symposium - International Astronomical Union 128 (1988): 301–7. http://dx.doi.org/10.1017/s0074180900119655.

Full text

Abstract:

Previous analyses of nutation angle errors from Mark III VLBI data have been made by estimating offset corrections to the instantaneous nutation angles from single-day observing sessions. Adjustments to the coefficients of the nutation model were then estimated from the time series of offset corrections. In this paper we estimate the corrections to the nutation series coefficients directly from the multi-year ensemble of data. The resulting corrections have smaller uncertainties than corrections estimated from the daily offsets because the direct solution has many fewer degrees of freedom. We

APA, Harvard, Vancouver, ISO, and other styles

5

Peng, Bo, Ping Ruan, Junfeng Han, et al. "Design and Simulation Analysis of Piezoelectric Ceramic Tube-Based Fiber Optic Nutator Applied to an Intersatellite Laser Communication System." Photonics 10, no. 7 (2023): 769. http://dx.doi.org/10.3390/photonics10070769.

Full text

Abstract:

The signal-receiving end of acquisition, pointing, and tracking (APT) systems applied to intersatellite laser communication terminals usually uses a fast-steering mirror (FSM) to control the fiber-coupling process, has a complex structural design, and induces large errors in the nonideal coaxial optical path. Herein, we propose a fiber-optic nutator using a piezoelectric ceramic tube (PCT) as the driving unit that allows scanning in the focal plane of the light signal to achieve active fiber coupling in the APT system. Specifically, this article describes the structural design principle of a P

APA, Harvard, Vancouver, ISO, and other styles

6

Kumar, Vivaswat, Federico Pizzi, André Giesecke, et al. "The effect of nutation angle on the flow inside a precessing cylinder and its dynamo action." Physics of Fluids 35, no. 1 (2023): 014114. http://dx.doi.org/10.1063/5.0134562.

Full text

Abstract:

The effect of the nutation angle on the flow inside a precessing cylinder is experimentally explored and compared with numerical simulations. The focus is laid on the typical breakdown of the directly forced m = 1 Kelvin mode for increasing precession ratio (Poincaré number) and the accompanying transition between laminar and turbulent flows. Compared to the reference case with a 90° nutation angle, prograde rotation leads to an earlier breakdown, while in the retrograde case, the forced mode continues to exist also for higher Poincaré numbers. Depending largely on the occurrence and intensity

APA, Harvard, Vancouver, ISO, and other styles

7

Park, Changsoo. "Heavy symmetric tops and the Hannay angle." American Journal of Physics 91, no. 5 (2023): 357. http://dx.doi.org/10.1119/5.0101149.

Full text

Abstract:

The dynamics of a heavy symmetric top are studied in connection with the Hannay angle. When the top undergoes a steady precession due to gravity without nutation, the Hannay angle has a geometric nature such that it is identical to the solid angle subtended by the loop swept out by the symmetry axis of the top. Here, we show that the Hannay angle can also be described by the angle between two radial vectors on the disk of the top corresponding to the pure spinning motion and the coupled motion of spin and precession for one period of the precession. The geometric nature of the angle between th

APA, Harvard, Vancouver, ISO, and other styles

8

Lin, Zheng, Li Gang Yao, and Shu Juan Huang. "Transmission Ratio Analysis and Controllable Tooth Profile Modeling for the Nutation Drive with Double Circular-Arc External and Internal Spiral Bevel Gears." Advanced Materials Research 97-101 (March 2010): 3128–34. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.3128.

Full text

Abstract:

This paper proposes an approach for calculating the transmission ratio of nutation drive based on the working principle of the nutation movements. Then, the analysis of the influences for the nutation angle on the transmission ratio is carried out. The controllable tooth profile modelling for external and internal spiral bevel gears with double circular-arc is proposed. Based on the proposed tooth profile modeling, the three dimensional modeling and virtual assembly of the nutation drive have been further completed. Finally, the kinematical simulation is preceded in the simulating system and t

APA, Harvard, Vancouver, ISO, and other styles

9

Мaidaniuk, V. "Analysis of problems of small-angle approximation in mathematical models of projectile flight." Military Technical Collection, no. 27 (November 30, 2022): 19–26. http://dx.doi.org/10.33577/2312-4458.27.2022.19-26.

Full text

Abstract:

The article deals with the topical issue of developing mathematical models of projectile flight, which accurately describe the projectile motion in the air. It is shown that the nature of the mathematical models presentation varies depending on the required reliability degree of the real physical projectile flight process representation by the mathematical model, the adequate consideration of certain forces (moments) acting on the projectile, as well as the level of information about the external flight conditions which include the parameters of the air in which the projectile moves.At the sam

APA, Harvard, Vancouver, ISO, and other styles

10

Rozenblat, G. M. "Estimates of the average angular velocity of the precession of Lagrange's top." Доклады Академии наук 485, no. 2 (2019): 176–81. http://dx.doi.org/10.31857/s0869-56524852176-181.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Slayman Beth, E., Kevin King, and E. Licato Paul. "5416412 Nutation angle measurement during MRI prescan." Magnetic Resonance Imaging 13, no. 7 (1995): V. http://dx.doi.org/10.1016/0730-725x(95)99147-p.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Ge, Zheng-Ming, Ming-Yen Liu, and Sann-Chie Lee. "THE INFLUENCE OF TEMPERATURE ON THE DRIFT OF GYROSCOPE." Transactions of the Canadian Society for Mechanical Engineering 19, no. 4 (1995): 363–82. http://dx.doi.org/10.1139/tcsme-1995-0019.

Full text

Abstract:

The dynamics, especially the drift, of a gyroscope with slowly varying axisymmetrical mass distribution are studied. By the data of temperature field of the inner gimbal, the changes of the position of center of mass and moments of inertia of the inner gimbal of gyro with time are obtained through the finite element method and approximate model study. The drift of a gyroscope can be analytically investigated according to the variation of the nutation angle and the precession angle. Since the temperature varies with time, the equations of motion are nonautonomous nonlinear differential equation

APA, Harvard, Vancouver, ISO, and other styles

13

Britzen, Silke, C. Fendt, G. Witzel, et al. "A precessing and nutating jet in OJ287." Proceedings of the International Astronomical Union 14, S342 (2018): 250–51. http://dx.doi.org/10.1017/s1743921318008049.

Full text

Abstract:

AbstractWe re-analyzed OJ287 in 120 Very Long Baseline Array (VLBA, MOJAVE) observations (at 15 GHz) covering the time span between Apr. 1995 and Apr. 2017. We find that the radio jet motion over the sky is consistent with a precessing and nutating jet source. The variability of the radio flux-density can be explained by Doppler beaming due to a change in the viewing angle. We suggest that part of the optical emission is due to synchrotron emission related to the jet radiation. We find a strikingly similar scaling for the timescales for precession and nutation as indicated for SS433 with a fac

APA, Harvard, Vancouver, ISO, and other styles

14

Zhang, Shuang-biao, Xing-cheng Li, and Zhong Su. "Cone Algorithm of Spinning Vehicles under Dynamic Coning Environment." International Journal of Aerospace Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/904913.

Full text

Abstract:

Due to the fact that attitude error of vehicles has an intense trend of divergence when vehicles undergo worsening coning environment, in this paper, the model of dynamic coning environment is derived firstly. Then, through investigation of the effect on Euler attitude algorithm for the equivalency of traditional attitude algorithm, it is found that attitude error is actually the roll angle error including drifting error and oscillating error, which is induced directly by dynamic coning environment and further affects the pitch angle and yaw angle through transferring. Based on definition of t

APA, Harvard, Vancouver, ISO, and other styles

15

Zhu, Lili, Guangxin Wang, and Wenzhong Fan. "Modeling and Simulation of the Nutation Drive with Movable Taper Teeth." Recent Patents on Mechanical Engineering 12, no. 1 (2019): 72–82. http://dx.doi.org/10.2174/2212797612666181228124232.

Full text

Abstract:

Background: The nutation drive is being extensively interested due to its ability to achieve a high reduction ratio with a compact structure and the potential for low vibration, high efficiency and design flexibility, while many problems including the difficulty to process the inner bevel gear and less number of teeth in engagement have restricted the development of it. Objective: The purpose of this paper was to propose and analyze a patent about a new nutation drive with movable taper teeth, in which rolling substitutes tooth meshing, the bevel gear processing difficulties and other issues c

APA, Harvard, Vancouver, ISO, and other styles

16

Popov, A. M., S. M. Muzhichek, M. A. Korzun, et al. "Mathematical Model of Impact Projectile Flight Dynamics as an Element of its Digital Twin." Mekhatronika, Avtomatizatsiya, Upravlenie 25, no. 1 (2024): 31–42. http://dx.doi.org/10.17587/mau.25.31-42.

Full text

Abstract:

This paper gives the analysis of the structure and characteristics of the mathematical model of the impact projectile’s flight dynamics. The model is designed for being used as an element of the projectile’s digital twin. The model is based on differential motion equations of a gyro-stabilized solid with an axisymmetric mass distribution. Different types of angle variables were chosen for describing aerodynamics and formulating equations of motion. Non-linear (considering the nutation angle) dependences for aerodynamic coefficients are proposed. They are created by applying proven scientific c

APA, Harvard, Vancouver, ISO, and other styles

17

Rimrott, F. P. J. "Nutation Accretion or Decay Due to Internal Energy Dissipation." Transactions of the Canadian Society for Mechanical Engineering 10, no. 4 (1986): 219–32. http://dx.doi.org/10.1139/tcsme-1986-0026.

Full text

Abstract:

In the present paper the secular attitude drift of a torquefree axisymmetric gyro is studied as a function of its attitude. By arguing that the gyro’s energy loss is due to the hystereses of its structural elements, an energy dissipation function is established, which is found to be proportional to an innate dissipativity of the gyro’s body and to the gyro’s attitude angle. It is then shown that deformations of the gyro configuration are required, to facilitate the attitude drift induced by dissipation. The deformed gyro configuration is found to be a function of the (slowly drifting) attitude

APA, Harvard, Vancouver, ISO, and other styles

18

Ding, S. W., and C. A. Mcdowell. "Nutation Magic-Angle-Spinning Spectra of Half-Integer Quadrupole Spin Systems." Journal of Magnetic Resonance, Series A 112, no. 1 (1995): 36–42. http://dx.doi.org/10.1006/jmra.1995.1007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Simic, Srboljub. "Stability of LevitronTM revisited." Theoretical and Applied Mechanics 44, no. 2 (2017): 255–70. http://dx.doi.org/10.2298/tam171107017s.

Full text

Abstract:

This note discusses some issues related to stability of stationary motion of hovering magnetized top in a homogeneous magnetic field. Stability of synchronous motion is analyzed using the simplified model in which the hovering motion of the center of mass is ignored. Stability boundaries are derived using Lyapunov direct method. In particular, it is shown that, for a given angle ? between magnetic moment dipole and principal axis of the top, there is an interval of stationary values of nutation angle ??0 for which the stationary synchronous motion is stable.

APA, Harvard, Vancouver, ISO, and other styles

20

Vengher, Dumitru. "Profile and Geometry of the Contact of Conjugate Teeth in Precessional Engagements." Intellectus, no. 1 (July 2025): 194–203. https://doi.org/10.56329/1810-7087.25.1.18.

Full text

Abstract:

The paper presents research on the 2K-H precessional transmission, characterized by a straighttooth gearing in convex-concave contact. The study focuses on constructive development, analyzing in detail the geometric and kinematic aspects of the gearing. The influences of key parameters such as the nutation angle θ, the cone-axoid angle δ, the tooth taper angle β and the tooth number ratio Z₁=Z₂±1 on the tooth profile shapes, the pressure angle αω and the distribution of contact points are investigated. The development of the tooth contact geometry is illustrated. Additionally, the use of appro

APA, Harvard, Vancouver, ISO, and other styles

21

Shen, Qing-ming, Li-jun Yan, Jian-zhong Zhao, et al. "Projectile-Artillery-Propellant Coupled Optimization Design Method of Artillery Weapon Systems." Journal of Physics: Conference Series 2460, no. 1 (2023): 012047. http://dx.doi.org/10.1088/1742-6596/2460/1/012047.

Full text

Abstract:

Abstract The artillery weapon system is a complex system of great non-linearity. There are many factors and their coupling relationship affecting the firing performance of artillery, and the key factor positioning is difficult. How to improve the firing performance of artillery through optimization is a challenge. The current optimization method considers less coupling factors. To approach this challenge, a projectile-artillery-propellant coupled optimization design method is proposed, where a multidisciplinary coupling of projectiles, artillery and propellant is proposed and used to construct

APA, Harvard, Vancouver, ISO, and other styles

22

Xue, Yun, De Wei Weng, and Gang Ming Gong. "Statics Analysis of the Mechanical Model of Nucleosome." Advanced Materials Research 343-344 (September 2011): 661–67. http://dx.doi.org/10.4028/www.scientific.net/amr.343-344.661.

Full text

Abstract:

Mechanical model of nucleoside and its equilibrium equations are set up, and the mechanical properties on the equilibrium position are analyzed. In the case constraint force and electrostatic attraction between cylinder OH and elastic rod are balanced, the analytic expression of nutation angle of the section and its conditions of existence are given. It is show that the cylinder OH can maintain equilibrium at any range of the precession angle. In the other case when unbanced, there is phenomenon of separation of elastic rod from cylinder OH in the spiral wound 2 circles, and numerical solution

APA, Harvard, Vancouver, ISO, and other styles

23

Hrabchak, V. I. "Influence of shell initial perturbational motion conditions on its nutation angle value." Military Technical Collection, no. 8 (May 4, 2013): 11–16. http://dx.doi.org/10.33577/2312-4458.8.2013.11-16.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Xie, Shangran, Abhinav Sharma, Maria Romodina, Nicolas Y. Joly, and Philip St J. Russell. "Tumbling and anomalous alignment of optically levitated anisotropic microparticles in chiral hollow-core photonic crystal fiber." Science Advances 7, no. 28 (2021): eabf6053. http://dx.doi.org/10.1126/sciadv.abf6053.

Full text

Abstract:

The complex tumbling motion of spinning nonspherical objects is a topic of enduring interest, both in popular culture and in advanced scientific research. Here, we report all-optical control of the spin, precession, and nutation of vaterite microparticles levitated by counterpropagating circularly polarized laser beams guided in chiral hollow-core fiber. The circularly polarized light causes the anisotropic particles to spin about the fiber axis, while, regulated by minimization of free energy, dipole forces tend to align the extraordinary optical axis of positive uniaxial particles into the p

APA, Harvard, Vancouver, ISO, and other styles

25

Podvigina, O. M. "Rotation of a Planet in a Three-body System: a Non-resonant Case." Nelineinaya Dinamika 18, no. 4 (2022): 0. http://dx.doi.org/10.20537/nd221001.

Full text

Abstract:

We investigate the temporal evolution of the rotation axis of a planet in a system comprised of the planet (which we call an exo-Earth), a star (an exo-Sun) and a satellite (an exo-Moon). The planet is assumed to be rigid and almost spherical, the difference between the largest and the smallest principal moments of inertia being a small parameter of the problem. The orbit of the planet around the star is a Keplerian ellipse. The orbit of the satellite is a Keplerian ellipse with a constant inclination to the ecliptic, involved in two types of slow precessional motion, nodal and apsidal. Applyi

APA, Harvard, Vancouver, ISO, and other styles

26

Dominik, Rune M., Lena Linhoff, Dominik Elsässer, and Wolfgang Rhode. "3C 84: a possibly precessing jet in 43-GHz observations." Monthly Notices of the Royal Astronomical Society 503, no. 4 (2021): 5448–54. http://dx.doi.org/10.1093/mnras/stab799.

Full text

Abstract:

ABSTRACT The central galaxy of the Perseus galaxy cluster, 3C 84 or NGC 1275, hosts one of the closest and well-observed active galactic nuclei (AGNs) and thus offered insights into a variety of phenomena over the past decades. Although close and well observed, some key properties of 3C 84 remain unknown. One of these properties is the inclination angle between the jet and the line of sight, for which a wide range of values can be found in publications. Previous studies have indicated a precessing behaviour of 3C 84’s jet that could explain these discrepancies. In this work, we analyse this be

APA, Harvard, Vancouver, ISO, and other styles

27

Lee, Cunbiao, Zhuang Su, Hongjie Zhong, Shiyi Chen, Mingde Zhou, and Jiezhi Wu. "Experimental investigation of freely falling thin disks. Part 2. Transition of three-dimensional motion from zigzag to spiral." Journal of Fluid Mechanics 732 (August 30, 2013): 77–104. http://dx.doi.org/10.1017/jfm.2013.390.

Full text

Abstract:

AbstractThe free-fall motion of a thin disk with small dimensionless moments of inertia (${I}^{\ast } \lt 1{0}^{- 3} $) was investigated experimentally. The transition from two-dimensional zigzag motion to three-dimensional spiral motion occurs due to the growth of three-dimensional disturbances. Oscillations in the direction normal to the zigzag plane increase with the development of this instability. At the same time, the oscillation of the nutation angle decreases to zero and the angle remains constant. The effects of initial conditions (release angle) were investigated. Two kinds of transi

APA, Harvard, Vancouver, ISO, and other styles

28

Wang, Guo, and Zhong. "An Underwater Vector Propulsion Device Based on the RS+2PRS Parallel Mechanism and Its Attitude Control Algorithm." Applied Sciences 9, no. 23 (2019): 5210. http://dx.doi.org/10.3390/app9235210.

Full text

Abstract:

In order to overcome the disadvantages of some existing autonomous underwater vehicles (AUVs), such as actuator extraposition and degree-of-freedom (DOF) redundancy, a 2-DOF vector propeller propulsion system with built-in actuator based on the deficient DOF parallel mechanism is proposed. The RS+2PRS (Revolute-Spherical+ Prismatic-Revolute-Spherical) parallel mechanism is used as the main structure, and the driving parts are placed in the interior of the AUV cabin, which is beneficial to the sealing and protection of the propulsion system. In addition, the motion parameters decoupling shows t

APA, Harvard, Vancouver, ISO, and other styles

29

Liu, Weibin, Lin Feng, Xinwei Chen, Yinshu Ding, Wentao Yu, and Hongwei Li. "Flywheel rotor cross-filter tracking feedback control." Journal of Physics: Conference Series 2741, no. 1 (2024): 012033. http://dx.doi.org/10.1088/1742-6596/2741/1/012033.

Full text

Abstract:

Abstract In light of the matter that the fixed-parameter cross-filter circuit cannot satisfy the phase compensation requirement in the full speed range, a cross-feedback tracking control method based on cross-filter feedback, in which the high-pass cutoff frequency varies with the nutation frequency, is proposed. The stability analysis of the designed control method is carried out by using the phase angle margin and the root trajectory diagram, and the results show that the cross-feedback tracking control can increase the phase angle margin and significantly enhance the stability of the system

APA, Harvard, Vancouver, ISO, and other styles

30

Cui, Xue Liang, Xian Guo Han, and Wu Yi Chen. "Dimensional Designing Study on a Novel 3-RPS Parallel Machine." Key Engineering Materials 407-408 (February 2009): 150–54. http://dx.doi.org/10.4028/www.scientific.net/kem.407-408.150.

Full text

Abstract:

Analysis on the singularity of the 3-RPS parallel machine which probably occurs in the engineering application is presented. The influence of the singular configurations in the workspace of the parallel machine is interpreted. To improve the orientation capacity of the moving platform, a novel complex spherical joint is designed, however a special singularity namely coaxial singularity is resulted in. By optimizing the dimension parameters and designing a special moving platform, the singularity can be averted in the wanted workspace, and the nutation angle of the parallel machine can be enlar

APA, Harvard, Vancouver, ISO, and other styles

31

Krikunov, M. M. "MODELING THE ANGULAR MOTION OF VARIABLE STRUCTURE SPACECRAFT ACCOUNT TO THE DESTABILIZING PROPERTIES OF THE JETSTREAM." DYNAMICS OF SYSTEMS, MECHANISMS AND MACHINES 11, no. 2 (2023): 45–50. http://dx.doi.org/10.25206/2310-9793-2023-11-2-45-50.

Full text

Abstract:

The work presents simulation of dynamics of a spacecraft~(SC) with variable mass. A generalized method for analyzing the phase trajectory curvature is used, being refined for the case in which the moments of forces applied to the SC depend on the angular velocity. Special cases are considered along with analyzing a spacecraft with dynamic asymmetry. Using the method, the presence of complex evolutions of angular motion is shown, in which the jet stream of the engine creates Coriolis effects (Magnus effect), destabilizing the precession cone and leading to an increase in the nutation angle.

APA, Harvard, Vancouver, ISO, and other styles

32

Pizzi, F., A. Giesecke, J. Šimkanin, V. Kumar, T. Gundrum, and F. Stefani. "Numerical and theoretical framework for the DRESDYN precession dynamo experiment." Magnetohydrodynamics 58, no. 4 (2022): 445–54. http://dx.doi.org/10.22364/mhd.58.4.8.

Full text

Abstract:

The upcoming DRESDYN (DREsden Sodium facility for DYNnamo and thermohydraulic studies) precession experiment will test the possibility to achieve magnetohydrodynamic dynamo action solely driven by precession. Here, after the description of the experimental facility, we present the results from direct numerical simulations with the aim to understand the flow behavior and its dynamo capability. The main conclusion is that in the nonlinear regime the nutation angle is an essential governing parameter which determines the flow structures and the possibility of dynamo action. We obtain clear indica

APA, Harvard, Vancouver, ISO, and other styles

33

Ol’shanskii, V. Yu. "Nonregular precession of a rigid body in three uniform fields." Прикладная математика и механика 88, no. 1 (2024): 17–33. http://dx.doi.org/10.31857/s0032823524010026.

Full text

Abstract:

This article presents a solution to the problem of the conditions of nonregular precession of a rigid body in three homogeneous fields, in which the ratio of precession and proper rotation velocities is constant. It is shown that the precession of a dynamically symmetric body is possible at a precession velocity equal to, twice as large as, or twice as small as the proper rotation velocity. For each of the cases, the set of admissible positions of the centres of the forces and the relation between the body moments of inertia and constant nutation angle are given.

APA, Harvard, Vancouver, ISO, and other styles

34

Rivoire, J., M. Terekhov, F. M. Meise, K. Gast, Z. Salhi, and L. M. Schreiber. "Flip-angle measurement by magnetization inversion: Calibration of magnetization nutation angle in hyperpolarized 3 He magnetic resonance imaging lung experiments." Magnetic Resonance in Medicine 65, no. 2 (2010): 399–408. http://dx.doi.org/10.1002/mrm.22638.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Thomas, Luzian, and Matthias Ernst. "Low-power WALTZ decoupling under magic-angle spinning NMR." Magnetic Resonance 5, no. 2 (2024): 153–66. http://dx.doi.org/10.5194/mr-5-153-2024.

Full text

Abstract:

Abstract. Heteronuclear low-power decoupling using the solution-state wideband alternating-phase low-power technique for zero-residual splitting (WALTZ) sequences has become quite popular in solid-state protein NMR and seems to work well. However, there are no systematic studies that characterize these sequences under magic-angle spinning (MAS) and give recommendations on which parameter should be used. We have studied in detail the use of WALTZ-16 and WALTZ-64 as low-power decoupling sequences under 100 kHz MAS by characterizing the resonance conditions analytically using numerical simulation

APA, Harvard, Vancouver, ISO, and other styles

36

Capitaine, N., and B. Guinot. "A non-rotating origin on the instantaneous equator." Symposium - International Astronomical Union 128 (1988): 33–38. http://dx.doi.org/10.1017/s0074180900119229.

Full text

Abstract:

In order to give an exact and clear description of the angle of rotation of the Earth, we propose to use, as the reference point in space, a “non-rotating origin” (Guinot 1979) such that its hour angle, reckoned from the origin of the longitudes (or “non-rotating origin” in the Earth), represents strictly the specific rotation of the Earth. The position of this origin on the instantaneous equator depends only on the trajectory of the pole of rotation. We show that the estimation of the deduced angle of rotation is not critically affected by the precision with which this trajectory is known. We

APA, Harvard, Vancouver, ISO, and other styles

37

SANCHEZDOMINGUEZ, U. "Influence of the nutation angle in gravitational settling of particles near vortices and in turbulence." European Journal of Mechanics - B/Fluids 22, no. 4 (2003): 369–77. http://dx.doi.org/10.1016/s0997-7546(03)00050-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Engelhardt, G., J. Ch Buhl, J. Felsche, and H. Foerster. "Resolution improvement of solid-state two-dimensional 23Na nutation NMR spectra by magic angle spinning." Chemical Physics Letters 153, no. 4 (1988): 332–37. http://dx.doi.org/10.1016/0009-2614(88)80151-9.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Gade, Terence P. F., William M. Spees, H. Carl Le, et al. "In vivo 5-fluorouracil and fluoronucleotideT1 relaxation time measurements using the variable nutation angle method." Magnetic Resonance in Medicine 52, no. 1 (2004): 169–73. http://dx.doi.org/10.1002/mrm.20131.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

He Hongyu, 贺红雨, 孙建锋 Sun Jianfeng, 侯培培 Hou Peipei, 张波 Zhang Bo, 许蒙蒙 Xu Mengmeng, and 劳陈哲 Lao Chenzhe. "Angle Error Detection of Local Oscillator Nutation Based on Acousto-Optic Deflector in Fine Tracking System." Chinese Journal of Lasers 45, no. 10 (2018): 1006001. http://dx.doi.org/10.3788/cjl201845.1006001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

MERDA, Tomasz MERDA. "SEMI STABLE FLIGHT OF SUPERSONIC MORTAR PROJECTILE." PROBLEMY TECHNIKI UZBROJENIA 149, no. 1 (2019): 23–46. http://dx.doi.org/10.5604/01.3001.0013.3769.

Full text

Abstract:

Significantly large dispersion of projectiles was observed at firing a specific type of a supersonic mortar projectile being devel-oped in the frame of RAK ANUNICJA program. The flying paths, parameters and reasons of falling points dispersion were determined for tested projectiles with a model of external ballistics describing the projectile as a rigid body. Analysis of received results has indicated that the dispersion was not caused by an aerodynamic jump but by an effect which has not been described yet in the literature and is named here as “projectile’s semi-stable flight”. The paper inc

APA, Harvard, Vancouver, ISO, and other styles

42

Bubenshchykov, Roman. "Explicit form of the modified model of the material point in the spherical coordinate system." Military Technical Collection, no. 29 (December 28, 2023): 3–10. http://dx.doi.org/10.33577/2312-4458.29.2023.3-10.

Full text

Abstract:

Projectile movement can be described by one of three mathematical models, which differ from each other in the main level of complexity and, accordingly, the level of adequacy to the real process of projectile movement in the air. Differential equations are the basis of mathematical models that characterize the spatial movement of a projectile. A modified model of a material point is presented, as a mathematical model of the flight of a projectile moving in the air; as components of the main vector of the acting forces, the components of the full aerodynamic force are taken into account - the f

APA, Harvard, Vancouver, ISO, and other styles

43

Jupin, Marc, Ayelet Gamliel, Yonatan Hovav, Jacob Sosna, J. Moshe Gomori, and Rachel Katz-Brull. "Application of the Steady-state Variable Nutation Angle Method for Faster Determinations of Long T1S–-an Approach Useful for the Design of Hyperpolarized Mr Molecular Probes." Magnetic Resonance Insights 8s1 (January 2015): MRI.S29358. http://dx.doi.org/10.4137/mri.s29358.

Full text

Abstract:

In the dissolution-dynamic nuclear polarization technique, molecular probes with long T1s are preferred. 13C nuclei of small molecules with no directly bonded protons or sp313C nuclei with proton positions substituted by deuterons may fulfill this requirement. The T1 determination of such new molecular probes is crucial for the success of the hyperpolarized observation. Although the inversion-recovery approach remained by and large the standard for T1 measurements, we show here that the steady-state variable nutation angle approach is faster and may be better suited for the determination of re

APA, Harvard, Vancouver, ISO, and other styles

44

Gorr, G. V. "On a Class of Precessions of a Rigid Body with a Fixed Point under the Action of Forces of Three Homogeneous Force Fields." Nelineinaya Dinamika 19, no. 2 (2023): 239–48. http://dx.doi.org/10.20537/nd230604.

Full text

Abstract:

This paper is concerned with a special class of precessions of a rigid body having a fixed point in a force field which is a superposition of three homogeneous force fields. It is assumed that the velocity of proper rotation of the body is twice as large as its velocity of precession. The conditions for the existence of the precessions under study are written in the form of a system of algebraic equations for the parameters of the problem. Its solvability is proved for a dynamically symmetric body. It is proved that, if the ellipsoid of inertia of the body is a sphere, then the nutation angle

APA, Harvard, Vancouver, ISO, and other styles

45

Vitzthum, Veronika, Marc A. Caporini, Simone Ulzega, and Geoffrey Bodenhausen. "Broadband excitation and indirect detection of nitrogen-14 in rotating solids using Delays Alternating with Nutation (DANTE)." Journal of Magnetic Resonance 212, no. 1 (2011): 234–39. https://doi.org/10.1016/j.jmr.2011.06.013.

Full text

Abstract:

A train of short rotor-synchronized pulses in the manner of Delays Alternating with Nutations for Tailored Excitation (DANTE) applied to nitrogen-14 nuclei (I = 1) in samples spinning at the magic angle at high frequencies (typically nu(rot) = 62.5 kHz so that tau(rot) = 16 mu s) allows one to achieve uniform excitation of a great number of spinning sidebands that arise from large first-order quadrupole interactions, as occur for aromatic nitrogen-14 nuclei in histidine. With routine rf amplitudes omega(1)(N-14)/(2 pi) = 60 kHz and very short pulses of a typical duration 0.5

APA, Harvard, Vancouver, ISO, and other styles

46

Vitzthum, Veronika, Marc A. Caporini, Simone Ulzega, et al. "Uniform broadband excitation of crystallites in rotating solids using interleaved sequences of delays alternating with nutation." Journal of Magnetic Resonance 223 (October 1, 2012): 228–36. https://doi.org/10.1016/j.jmr.2012.05.024.

Full text

Abstract:

In solids that are spinning about the magic angle, trains of short pulses in the manner of Delays Alternating with Nutations for Tailored Excitation (DANTE) allow one to improve the efficiency of the excitation of magnetization compared to rectangular pulses. By interleaving N pulse trains with N > 1, one obtains 'DANTE-N' sequences comprising N pulses per rotor period that extend over K rotor periods. Optimized interleaved DANTE schemes with N > 1 are shorter than basic DANTE-1 sequences with N = 1. Therefore, they are less affected by coherent or incoherent decays, thus leading to high

APA, Harvard, Vancouver, ISO, and other styles

47

Hill, W., F. Marlow, and J. Kornatowski. "Raman Spectroscopic Investigation of the Physical State of para-Nitroaniline in Channels of the AIPO4-5 Molecular Sieve." Applied Spectroscopy 48, no. 2 (1994): 224–27. http://dx.doi.org/10.1366/0003702944028515.

Full text

Abstract:

The physical state of para-nitroaniline ( p-NA) adsorbed in the channels of AlPOj-5 molecular sieves has been investigated by means of Raman spectroscopy. The Raman spectra show that the p-NA molecules within the channels form either a phase of head-to-tail chains similar to that in the solid crystaline p-NA with a characteristic ω3 band at 1282 cm−1 or a second phase, which is characterized by the similarly strong band around 1295 cm−1. This second phase consists of weakly interacting p-NA molecules in a similar pseudo-quinonoidic state as molten p-NA. Despite the missing formation of solid-l

APA, Harvard, Vancouver, ISO, and other styles

48

Pizzi, Federico, André Giesecke, Ján Šimkanin, and Frank Stefani. "Prograde and retrograde precession of a fluid-filled cylinder." New Journal of Physics 23, no. 12 (2021): 123016. http://dx.doi.org/10.1088/1367-2630/ac3c0f.

Full text

Abstract:

Abstract We numerically study precession driven flows in a cylindrical container whose nutation angle varies between 60 and 90 degrees for prograde and retrograde precession. For prograde precession we observe sharp transitions between a laminar and a turbulent flow state with low and high geostrophic axisymmetric flow components related with a centrifugal instability, while for retrograde precession a rather smooth transition between a low state and a high state occurs. At the same time prograde and perpendicular precession shows an abrupt breakdown of the flow directly excited by the forcing

APA, Harvard, Vancouver, ISO, and other styles

49

Pasynok, S. L. "Estimate of the Error Owing to Neglect of the Earth’s Triaxiality in the Transfer Function for Nutation Angle Calculations." Measurement Techniques 57, no. 10 (2015): 1097–102. http://dx.doi.org/10.1007/s11018-015-0586-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Bubenshchykov, R., and S. Bondarenko. "THE MATHEMATICAL MODEL OF THE PROJECTILE FLIGHT AS A MODIFIED MODEL OF THE MATERIAL POINT IN EXPRESS FORM." Collection of scientific works of the National Academy of the National Guard of Ukraine 2, no. 42 (2023): 24–33. http://dx.doi.org/10.33405/2409-7470/2023/2/42/293335.

Full text

Abstract:

A promising direction for improving the accuracy and operational efficiency of firing artillery systems is the development of ballistic computers that implement procedures for determining settings using the solution of a system of differential equations (mathematical model) that describe the movement of a projectile in the air. The main problem in the development of mathematical models is the possibility of determining with a given accuracy the coefficients of aerodynamic forces (moments) that are in the right-hand sides of differential equations. An urgent issue in this direction is the study

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!