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Статті в журналах з теми "Angular orientation"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 липня 2025

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1

Rubies, Elena, and Jordi Palacín. "Defining the Consistent Velocity of Omnidirectional Mobile Platforms." Machines 12, no. 6 (2024): 397. http://dx.doi.org/10.3390/machines12060397.

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The maximum linear (or translational) velocity achievable by an omnidirectional platform is not uniform as it depends on the angular orientation of the motion. This velocity is limited by the maximum angular velocity of the motors driving the wheels and also depends on the mechanical configuration and orientation of the wheels. This paper proposes a procedure to compute an upper bound for the translational velocity, named the consistent velocity of the omnidirectional platform, which is defined as the minimum of the maximum translational velocities achievable by the platform in any angular ori

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2

André, Jorge C. S., João C. Gonçalves, Gilberto C. Vaz, and Domingos X. Viegas. "Angular variation of fire rate of spread." International Journal of Wildland Fire 22, no. 7 (2013): 970. http://dx.doi.org/10.1071/wf12028.

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Laboratory fire tests were performed in still air, for variable inclinations (10°, 15°) and fuel bed dimensions (1.28×2.50–3.0×4.6m2), with homogeneous fuel beds of pine needles and pine wood excelsior. The fire ignition was made at a point, along a closed line with no fuel inside and along a straight edge of the fuel bed. The tests were recorded with an infrared camera and various techniques were developed to implement direct and indirect empirical methods of construction of the ‘orientation function’ of the fire in the given fuel bed and ambient conditions, showing how the rate of spread of

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3

Furukawa, Minoru, Yukihide Fukuda, Keiichiro Oh-ishi, Z. Horita, and Terence G. Langdon. "An Investigation of Deformation in Copper Single Crystals Using Equal-Channel Angular Pressing." Materials Science Forum 503-504 (January 2006): 113–18. http://dx.doi.org/10.4028/www.scientific.net/msf.503-504.113.

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This paper describes experiments in which high purity copper single crystals of two different orientations were processed for one pass by equal-channel angular pressing (ECAP) and the deformed structures were examined using optical microscopy (OM), orientation imaging microscopy (OIM) and transmission electron microscopy (TEM). The first single crystal (0° specimen) was oriented within the entrance channel of the die so that the {111} slip plane and the <110> slip direction were parallel to the theoretical shear plane and shear direction, respectively. The second crystal (20° specimen) w

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4

Stanischewski, Sarah, Carolin S. Altmann, Anselm Brachmann, and Christoph Redies. "Aesthetic Perception of Line Patterns: Effect of Edge-Orientation Entropy and Curvilinear Shape." i-Perception 11, no. 5 (2020): 204166952095074. http://dx.doi.org/10.1177/2041669520950749.

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Curvilinearity is a perceptual feature that robustly predicts preference ratings for a variety of visual stimuli. The predictive effect of curved/angular shape overlaps, to a large degree, with regularities in second-order edge-orientation entropy, which captures how independent edge orientations are distributed across an image. For some complex line patterns, edge-orientation entropy is actually a better predictor for what human observers like than curved/angular shape. The present work was designed to disentangle the role of the two features in artificial patterns that consisted of either cu

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5

Vergara-Torres, Santiago, and Kristel Solange Novoa-Roldán. "Control glove based on angular orientation." Visión electrónica 15, no. 2 (2021): 226–37. http://dx.doi.org/10.14483/22484728.18631.

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This document presents a prototype developed at the Universidad Distrital Francisco José de Caldas of a tool called Control Glove based on angular orientation that will be in charge of controlling different specialized systems, the system starts from the information that can be found in the movements of the hands, this information varies between acceleration, velocity and angular orientation with respect to the three-dimensional Cartesian plane (X, Y, Z). The final prototype of the control glove may be used in industrial, manufacturing, educational, medicinal, and amateur applications, which w

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6

Okai, Daisuke, Atsushi Yamamoto, Toshiya Doi, and Hiroki Adachi. "Characteristics of Cube Orientation for Pure Iron Tape Fabricated by Cold Rolling and Annealing." Materials Science Forum 1016 (January 2021): 1830–34. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.1830.

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A pure iron tape with cube orientation was fabricated by cold rolling and annealing. The orientation characteristics of the pure iron tape were evaluated using electron back-scattering diffraction (EBSD) analysis. The secondary recrystallized grains with cube orientation was formed on the tape surface for the pure iron tape. The coarse grains with a grain size of ca. 1mm were observed on the tape surface. The areal fraction of cube orientations with an angular deviation ≤ 20 ̊ amounts to ca. 81%.

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7

He, Jianhan, and Ulrich Bismayer. "Polarized mapping Raman spectroscopy: identification of particle orientation in biominerals." Zeitschrift für Kristallographie - Crystalline Materials 234, no. 6 (2019): 395–400. http://dx.doi.org/10.1515/zkri-2019-0004.

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Abstract The identification of the texture of biominerals and the particle orientation in the bivalve shells of Anodonta cygnea was performed using polarized Raman spectroscopy mapping measurements. A single crystal of aragonite served as a reference to disclose orientational information on the mesoscopic scale. The relative intensities of different Raman modes combined with the determination of depolarization ratio of the Ag Raman mode at 1087 cm−1 of an aragonite single crystal was used to indicate the angular variation of aragonite crystallites in biominerals. The imaging technique shows th

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8

Westerdale, John C., Ronald Adrian, Kyle Squires, Hari Chaliki, and Marek Belohlavek. "Effects of Bileaflet Mechanical Mitral Valve Rotational Orientation on Left Ventricular Flow Conditions." Open Cardiovascular Medicine Journal 9, no. 1 (2015): 62–68. http://dx.doi.org/10.2174/1874192401509010062.

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We studied left ventricular flow patterns for a range of rotational orientations of a bileaflet mechanical heart valve (MHV) implanted in the mitral position of an elastic model of a beating left ventricle (LV). The valve was rotated through 3 angular positions (0, 45, and 90 degrees) about the LV long axis. Ultrasound scans of the elastic LV were obtained in four apical 2-dimensional (2D) imaging projections, each with 45 degrees of separation. Particle imaging velocimetry was performed during the diastolic period to quantify the in-plane velocity field obtained by computer tracking of dilute

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9

Chen, Chao-Yi, P. J. Kim, and D. T. Walker. "Angular Bias Errors in Three-Component Laser Velocimeter Measurements." Journal of Fluids Engineering 118, no. 3 (1996): 555–61. http://dx.doi.org/10.1115/1.2817794.

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For three-component laser velocimeter systems, the change in projected area of the coincident measurement volume for different flow directions will introduce an “angular” bias in naturally sampled data. In this study, the effect of turbulence level and orientation of the measurement volumes on angular bias errors was examined. The operation of a typical three-component laser velocimeter was simulated using a Monte Carlo technique. Results for the specific configuration examined show that for turbulence levels less than 10 percent no significant bias errors in the mean velocities will occur and

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10

Leonov, A. I., and P. N. Nikolaev. "Providing Nanosatellite Triaxial Gravitational Orientation Using Magnetic Actuators." IOP Conference Series: Materials Science and Engineering 1215, no. 1 (2022): 012005. http://dx.doi.org/10.1088/1757-899x/1215/1/012005.

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Abstract Three-axis gravity stabilization of 3U CubeSat is achieved due to selection of the nanosatellite moments of inertia at the design stage, as well as special modes included in the algorithm to provide stabilization of CubeSat relative to each motion channel separately. In this paper, we propose a modified algorithm based on the magnetic stabilization algorithm B-dot. The modified algorithm provides three modes intended to damp the initial angular velocity to the value of the orbital angular velocity, to keep the angular velocity at a value close to that of the orbital angular velocity,

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11

Miyamoto, Hiroyuki, J. Fushimi, Takura Mimaki, Alexei Vinogradov, and Satoshi Hashimoto. "The Effect of the Initial Orientation on Microstructure Development of Copper Single Crystals Subjected to Equal-Channel Angular Pressing." Materials Science Forum 503-504 (January 2006): 799–804. http://dx.doi.org/10.4028/www.scientific.net/msf.503-504.799.

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Copper single crystals were subjected to equal-channel angular pressing (ECAP) via the so-called route A and Bc, in order to examine the influence of initial crystallographic orientation and processing route on microstructure development and grain fragmentation. Microstructural changes were examined by transmission electron microscopy (TEM). The pressing via the route Bc resulted in finer microstructure for all orientations in terms of grain size, equiaxiality and orientation scattering after four passes. Effect of initial crystallographic orientation on the grain refinement was also recognize

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12

Quinn, T., and J. Binney. "Galactic accretion and angular momentum re-orientation." Monthly Notices of the Royal Astronomical Society 255, no. 4 (1992): 729–36. http://dx.doi.org/10.1093/mnras/255.4.729.

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13

Milner, Valery, and Yehiam Prior. "Biaxial spatial orientation of atomic angular momentum." Physical Review A 59, no. 3 (1999): R1738—R1741. http://dx.doi.org/10.1103/physreva.59.r1738.

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14

Weichan Yu, K. Daniilidis, and G. Sommer. "Approximate orientation steerability based on angular Gaussians." IEEE Transactions on Image Processing 10, no. 2 (2001): 193–205. http://dx.doi.org/10.1109/83.902274.

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15

Kang, Pilgyu, Xavier Serey, Yih-Fan Chen, Dakota O'Dell, and David Erickson. "Near-Field Angular Orientation of Biological Materials." Biophysical Journal 104, no. 2 (2013): 676a. http://dx.doi.org/10.1016/j.bpj.2012.11.3733.

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16

Kang, Pilgyu, Xavier Serey, Yih-Fan Chen, and David Erickson. "Angular Orientation of Nanorods Using Nanophotonic Tweezers." Nano Letters 12, no. 12 (2012): 6400–6407. http://dx.doi.org/10.1021/nl303747n.

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17

Liu, Xu-dong, Dong-guang Li, and Qiang Shen. "Swerving Orientation of Spin-Stabilized Projectile for Fixed-Cant Canard Control Input." Mathematical Problems in Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/173571.

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Анотація:

Due to the large launch overload and high spin rate of spin-stabilized projectile, no attitude sensor is adopted in square crossing fixed-cant canard concept, which causes the lack of existing projectile linear theory for the close form solution of swerving motion. This work focuses on swerving orientation prediction with the restricted conditions. By importing the mathematical models of canard force and moment into the projectile angular motion equations, trim angle induced by canard control force is extracted as the analytical solution of angle of attack increment (AOAI). On this basis, anal

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18

Fuhs, Mark C., Shea R. VanRhoads, Amanda E. Casale, Bruce McNaughton, and David S. Touretzky. "Influence of Path Integration Versus Environmental Orientation on Place Cell Remapping Between Visually Identical Environments." Journal of Neurophysiology 94, no. 4 (2005): 2603–16. http://dx.doi.org/10.1152/jn.00132.2005.

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To assess the effects of interactions between angular path integration and visual landmarks on the firing of hippocampal neurons, we recorded from CA1 pyramidal cells as rats foraged in two identical boxes with polarizing internal cues. In the same-orientation condition, following an earlier experiment by Skaggs and McNaughton, the boxes were oriented identically and connected by a corridor. In the opposite-orientation condition, the boxes were abutted by rotating them 90° in opposite directions, so that their orientations differed by 180°. After 16–23 days of pretraining on the same-orientati

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19

Murooka, Y., N. Tanaka, and M. Hibino. "Angular - Resolved Electron - Energy - Loss - Spectroscopy of Perovskite Manganeese Oxide." Microscopy and Microanalysis 6, S2 (2000): 202–3. http://dx.doi.org/10.1017/s143192760003350x.

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Among perovskite manganese oxide systems, La1-xSrxMnO3, has been intensely investigated because of its interesting magnetic and electronic properties such as colossal magneto resistance (CMR). These properties are largely determined by the electronic structure of the valence electrons. The electronic structure of the electrons in the energy states near the Fermi level was probed by using electronic excitations of less than a few eV. Ordinarily, the information obtained about the energy states was integrated over all crystal orientations, and only few anisotropic systems were studied in terms o

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20

Akinin, K. P., and V. G. Kireyev. "TUNING THE ANGULAR SPEED CONTROLLER OF THE REACTIVE FLYWHEEL OF THE NANOSATELLITE ORIENTATION SYSTEM." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2023, no. 64 (2022): 44–52. http://dx.doi.org/10.15407/publishing2023.64.044.

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The paper describes reactive flywheels based on brushless magnetoelectric motors for controlling the spatial orientation of satellites, developed at the Institute of Electrodynamics of the National Academy of Sciences of Ukraine. The main attention is paid to the problem of implementing a rotor angular speed and position sensor, provided that it can be integrated into the motor design. The influence of the number of feedback signal pulses per one revolution of the motor shaft on the tuning of the reactive flywheel angular speed controller is studied under the condition that the ripple range at

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21

Pavlov, D. V. "Noise assessment of the gyroscopic channel of the inertial orientation and navigation system." Vestnik NovSU, no. 1 (2025): 34–43. https://doi.org/10.34680/2076-8052.2025.1(139).34-43.

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This article presents a study of the error components of the output signal in the gyroscopic channel of a small-sized inertial orientation and navigation system. The study of noise components was carried out on four copies of angular velocity sensors. The gyroscopic channel of this orientation and navigation system is implemented using the TG-100 MEMS angular velocity sensor from the Laboratory of Micro-Devices. The spectral composition of the random error components of the angular velocity sensor is estimated using the Allan variation method at room temperature. The intensity coefficients of

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22

Sidorov, Ilya Andreevich, and Alexander Alekseevich Manoilenko. "MATHEMATICAL MODEL FOR SOLVING THE NAVIGATION PROBLEM AND ANGULAR ORIENTATION SPACECRAFT." Journal of Rocket-Space Technology 27, no. 4 (2019): 101–8. http://dx.doi.org/10.15421/451915.

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Currently, there is an increased interest in the creation of strapdown inertial navigation systems (SINS), which make up the information core of modern airborne systems for the orientation and navigation of spacecraft (SC). An urgent problem arises, which is associated with the development of high-precision algorithms for estimating and filtering data from the sensors of the SC motion parameters, the mathematical model of the SINS, calculating its errors and analyzing the effect of errors on the characteristics of the navigation system and orientation of the SC. A mathematical model is propose

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23

Stančin, Sara, and Sašo Tomažič. "On the Interpretation of 3D Gyroscope Measurements." Journal of Sensors 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/9684326.

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We demonstrate that the common interpretation of angular velocities measured by a 3D gyroscope as being sequential Euler rotations introduces a systematic error in the sensor orientation calculated during motion tracking. For small rotation angles, this systematic error is relatively small and can be mistakenly attributed to different sources of sensor inaccuracies, including output bias drift, inaccurate sensitivities, and alignments of the sensor sensitivity axes as well as measurement noise. However, even for such small angles, due to accumulation over time, the erroneous rotation interpret

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24

Furukawa, Minoru, Z. Horita, and Terence G. Langdon. "Microstructures of Aluminum and Copper Single Crystals Processed by Equal-Channel Angular Pressing." Materials Science Forum 638-642 (January 2010): 1946–51. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.1946.

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High purity aluminum (Al) and copper (Cu) single crystals of different crystallographic orientations were processed for one pass by equal-channel angular pressing (ECAP). The deformed structures were examined using orientation imaging microscopy (OIM) and transmission electron microscopy (TEM). This paper examines the experimental results in terms of the values of the shear factors based on simple shear theory.

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25

Kovbasa, Serhii M., Nataliia D. Krasnoshapka, Yevhenii V. Kolomiichuk, and Anton O. Kholosha. "Comparison of incremental encoder digital signal processing techniques for theinduction motor flux-torque vector control systems." Applied Aspects of Information Technology 7, no. 1 (2024): 46–58. http://dx.doi.org/10.15276/aait.07.2024.4.

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The articlepresents the results of a study on the effectiveness of varioustechniques forsynchronous reference frame angular position numerical calculation in flux-torque vector control system of induction motor.Investigation was caried out taking into account the discrete nature of the angular speedsignal obtained using an incremental encoder. In this workfor investigation by simulation useda direct torque vector control system, which, in the presence of an ideal rotor angular speedsignal, ensures direct asymptotic field orientation, asymptotic tracking of torque-flux referencetrajectories, as

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26

Furukawa, Minoru, Z. Horita, and Terence G. Langdon. "Application of Equal-Channel Angular Pressing to Aluminum and Copper Single Crystals." Materials Science Forum 539-543 (March 2007): 2853–58. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.2853.

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Анотація:

This paper describes experiments in which high purity aluminum (Al) and copper (Cu) single crystals of different crystallographic orientations were processed for one pass by equal-channel angular pressing (ECAP). The deformed structures were examined using optical microscopy (OM), orientation imaging microscopy (OIM) and transmission electron microscopy (TEM). The results for Al single crystals are compared with those for Cu single crystals.

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27

Cohen, Bernard, Susan Wearne, Mingjia Dai, and Theodore Raphan. "Spatial orientation of the angular vestibulo-ocular reflex." Journal of Vestibular Research 9, no. 3 (1999): 163–72. http://dx.doi.org/10.3233/ves-1999-9303.

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During vestibular nystagmus, optokinetic nystagmus (OKN), and optokinetic afternystagmus (OKAN), the axis of eye rotation tends to align with the vector sum of linear accelerations acting on the head. This includes gravitational acceleration and the linear accelerations generated by translation and centrifugation. We define the summed vector of gravitational and linear accelerations as gravito-inertial acceleration (GIA) and designate the phenomenon of alignment as spatial orientation of the angular vestibuloocular reflex (aVOR). On the basis of studies in the monkey, we postulated that the sp

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28

Sanko, A. A., and A. A. Sheinikov. "Angular orientation determination in SINS: traditional algorithms comparison." Civil Aviation High Technologies 25, no. 1 (2022): 77–88. http://dx.doi.org/10.26467/2079-0619-2022-25-1-77-88.

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The principle of organization of strap-down inertial navigation systems is based on numerical integration of angular velocities and accelerations. The purpose of numerical integration algorithms is to approximate the behavior of a dynamic system (unmanned aerial vehicle – UAV) with continuous time using a digital computer. The efficiency of numerical integration is determined by the accuracy and stability of the computational process. The integration algorithm may have a small integration error, but at the same time be inefficient due to the instability of the numerical method when the step or

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29

Walker, P. M. "Angular momentum orientation at bandcrossings in rotating nuclei." Journal of Physics G: Nuclear and Particle Physics 34, no. 1 (2006): 123–27. http://dx.doi.org/10.1088/0954-3899/34/1/008.

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30

Megalingam, Rajesh Kannan, Deepak Nagalla, Ravi Kiran Pasumarthi, Vamsi Gontu, and Phanindra Kumar Allada. "Angular Orientation of Steering Wheel for Differential Drive." Advances in Science, Technology and Engineering Systems Journal 5, no. 3 (2020): 275–83. http://dx.doi.org/10.25046/aj050336.

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31

Bartschat, K. "Angular momentum orientation in elastic electron-atom scattering." Journal of Physics B: Atomic and Molecular Physics 20, no. 23 (1987): L815—L819. http://dx.doi.org/10.1088/0022-3700/20/23/008.

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32

Rauch, E. F., and M. Véron. "Crystal Orientation Angular Resolution with Precession Electron Diffraction." Microscopy and Microanalysis 22, S3 (2016): 500–501. http://dx.doi.org/10.1017/s1431927616003354.

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33

Beloshenko, V. A., V. N. Varyukhin, A. V. Voznyak, and Yu V. Voznyak. "Polyoxymethylene orientation by equal-channel multiple angular extrusion." Journal of Applied Polymer Science 126, no. 3 (2012): 837–44. http://dx.doi.org/10.1002/app.36971.

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34

Yang, Zhicheng, Bert-Jan F. van Beijnum, Bin Li, Shenggang Yan, and Peter H. Veltink. "Estimation of Relative Hand-Finger Orientation Using a Small IMU Configuration." Sensors 20, no. 14 (2020): 4008. http://dx.doi.org/10.3390/s20144008.

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Relative orientation estimation between the hand and its fingers is important in many applications, such as virtual reality (VR), augmented reality (AR) and rehabilitation. It is still quite a big challenge to do the estimation by only exploiting inertial measurement units (IMUs) because of the integration drift that occurs in most approaches. When the hand is functionally used, there are many instances in which hand and finger tips move together, experiencing almost the same angular velocities, and in some of these cases, almost the same accelerations are measured in different 3D coordinate s

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35

Tsai, Chi-Yi, and Wei-Chuan Lin. "Precise Orientation Estimation for Rotated Object Detection Based on a Unit Vector Coding Approach." Electronics 13, no. 22 (2024): 4402. http://dx.doi.org/10.3390/electronics13224402.

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Existing rotated object detection methods usually use angular parameters to represent the object orientation. However, due to the symmetry and periodicity of these angular parameters, a well-known boundary discontinuity problem often results. More specifically, when the object orientation angle approaches the periodic boundary, the predicted angle may change rapidly and adversely affect model training. To address this problem, this paper introduces a new method that can effectively solve the boundary discontinuity problem related to angle parameters in rotated object detection. Our approach in

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36

Wright, Stuart I., Jay A. Basinger, and Matthew M. Nowell. "Angular Precision of Automated Electron Backscatter Diffraction Measurements." Materials Science Forum 702-703 (December 2011): 548–53. http://dx.doi.org/10.4028/www.scientific.net/msf.702-703.548.

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Electron backscatter diffraction (EBSD) has become the preferred technique for characterizing the crystallographic orientation of individual grains in polycrystalline microstructures due to its ability to rapidly measure orientations at specific points in the microstructure at resolutions of approximately 20-50nm depending on the capabilities of the scanning electron microscope (SEM) and on the material being characterized. Various authors have studied the angular resolution of the orientations measured using automated EBSD. These studies have stated values ranging from approximately 0.1° to 2

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37

Balaban, Carey D., David M. McGee, Jianxun Zhou, and Charles A. Scudder. "Responses of Primate Caudal Parabrachial Nucleus and Kölliker-Fuse Nucleus Neurons to Whole Body Rotation." Journal of Neurophysiology 88, no. 6 (2002): 3175–93. http://dx.doi.org/10.1152/jn.00499.2002.

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The caudal aspect of the parabrachial (PBN) and Kölliker-Fuse (KF) nuclei receive vestibular nuclear and visceral afferent information and are connected reciprocally with the spinal cord, hypothalamus, amygdala, and limbic cortex. Hence, they may be important sites of vestibulo-visceral integration, particularly for the development of affective responses to gravitoinertial challenges. Extracellular recordings were made from caudal PBN cells in three alert, adult female Macaca nemestrina through an implanted chamber. Sinusoidal and position trapezoid angular whole body rotation was delivered in

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38

Yadav, Shiv Narayan, and Santosh Kumar Sah. "Study of Spatial Orientation of Angular Momentum of z-Magnitude SDSS DR-13 Galaxies with Red Shift 0.50 to 0.53." Journal of Institute of Science and Technology 26, no. 1 (2021): 1–7. http://dx.doi.org/10.3126/jist.v26i1.37805.

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The spatial orientations of 142,929 SDSS DR-13, z- magnitude galaxies having red shift 0.50 to 0.53 have been analyzed. The main goal of this work is to examine the orientation of the angular momentum of galaxies within the given redshift limit in the framework of three different scenarios 'Hierarchy model', 'Pancake model', and the 'Primordial vorticity model'. By using Godlowskian transformation the two-dimensional data were converted into three-dimensional data (polar and azimuthal angles). The expected isotropy distribution curves were obtained by removing the selection effects and perform

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39

Plaksiy, Yuriy, and Yuriy Kuznyetsov. "Analytical-numerical modeling of the process of solid body orientation in quaternions through a sequence of Euler angles for accurate analysis of orientation algorithms in SINS." Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines, no. 2 (December 21, 2023): 58–64. http://dx.doi.org/10.20998/2078-9130.2023.2.293474.

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Two concepts for constructing analytical angular test motions of a rigid body for testing orientation algorithms when designing strapdown orientation systems are considered. The first concept is based on representing the orientation quaternion in a sequence of three Euler angles. The second concept is based on a formalized representation of the quaternion as a superposition of trigonometric functions of linear arguments and does not have a clear visual interpretation through the angles of elementary rotations. Analytical expressions for the model angular velocity can be obtained from the inver

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40

Rekveldt, M. Theo, Wicher Kraan, and Thomas Keller. "High-resolution diffraction using Larmor precession of polarized neutrons." Journal of Applied Crystallography 35, no. 1 (2002): 28–33. http://dx.doi.org/10.1107/s0021889801017812.

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A new Larmor precession device, consisting of two separate precession modules, is introduced. It operates as a high-resolution neutron diffractometer, without the need for a highly collimated beam, necessary in conventional high-resolution neutron diffraction. The same instrument operates in different modes as an effective small-angle scattering device or accurately determines the line profile, the lattice plane orientation or the angular spread in crystal orientations. A dramatic intensity gain can be obtained in all applications discussed, compared with the conventional analogues, owing to t

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41

Ozgoren, M. Kemal. "Comparative study of attitude control methods based on Euler angles, quaternions, angle–axis pairs and orientation matrices." Transactions of the Institute of Measurement and Control 41, no. 5 (2018): 1189–206. http://dx.doi.org/10.1177/0142331218773519.

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This paper presents a comparative study about the attitude control methods based on four commonly used error indicators, namely the triad of 3-2-1 deviational Euler angles, the error quaternion, the deviational angle–axis pair and the orientation error matrix. These error indicators are used here with the same backstepping control law to have a common basis of comparison. This control law makes the controller track a restoring angular velocity generated here specifically for each error indicator. This comparative study shows that all these error indicators can be used satisfactorily even in th

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42

Matasov, A. I., and Kh In'. "Calibration of a 3D Sensor under Its Orientation Constraint." Avtomatika i telemehanika, no. 6 (June 15, 2023): 144–68. http://dx.doi.org/10.31857/s0005231023060089.

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Three-dimensional (3D) sensors usually require a calibration procedure. In some cases, scale factor errors depend on the signs of the projections of the vector input signal onto the sensitivity axes of the sensor. To eliminate the ambiguity of scale factor errors, the angular positions of the sensor can be restricted so that the corresponding projections have a definite sign. This paper presents an analytical solution of the optimal calibration problem for a 3D sensor under a constraint on its angular positions.

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43

Guedry, F. E., A. H. Rupert, B. J. McGrath, and C. M. Qman. "The Dynamics of Spatial Orientation During Complex and Changing Linear and Angular Acceleration1." Journal of Vestibular Research 2, no. 4 (1992): 259–83. http://dx.doi.org/10.3233/ves-1992-2402.

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The dynamics of spatial orientation perception were examined in a series of experiments in which a total of 43 subjects were passively exposed to various combinations of linear and angular acceleration during centrifuge runs. Perceptual effects during deceleration were much stronger than effects during acceleration. The dynamics of spatial orientation perception differed substantially from changes in the vestibulo-ocular reflex (VOR). VOR was fairly well predicted by a current model, but our experiments revealed perceived change in attitude (roll, pitch, yaw tilt position in space) and perceiv

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44

Molodenkov, A. V., Ya G. Sapunkov, and T. V. Molodenkova. "The New Analytical Algorithm for Determining the Strapdown INS Orientation." Mekhatronika, Avtomatizatsiya, Upravlenie 20, no. 10 (2019): 624–28. http://dx.doi.org/10.17587/mau.20.624-628.

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The analytical solution of an approximate (truncated) equation for the vector of a rigid body finite rotation has made it possible to solve the problem of determining the quaternion of orientation of a rigid body for an arbitrary angular velocity and small angle of rotation of a rigid body with the help of quadratures. Proceeding from this solution, the following approach to the construction of the new analytical algorithm for computation of a rigid body orientation with the use of strapdown INS is proposed: 1) By the set components of the angular velocity of a rigid body on the basis of mutua

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45

Serrano-Ensástiga, E. "A rotating quantum system without angular momentum and shape deformations." Revista de la Escuela de Física 6, no. 1 (2019): 9–24. http://dx.doi.org/10.5377/ref.v6i1.7016.

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The free translational dynamics of an n-body quantum system has many applications, e.g. in molecular and nuclei systems, where it is common to classify the degrees of freedom of the system in 3 rotational and 3n - 6 shape coordinates. It is known that there exists an interaction between the shape and orientation degrees of freedom. In particular, changes of the shape could induce an orientation change. In this work, it is shown a rotating quantum system which does not deform its shape probability density and with vanishing angular momentum. The orientation change is monitored with a localized

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46

Navarro, M. D., M. D. Meseguer, I. Ordeig, and J. Lluch. "Milling angular references and process parameters on fiber reinforced plastics." IOP Conference Series: Materials Science and Engineering 1193, no. 1 (2021): 012004. http://dx.doi.org/10.1088/1757-899x/1193/1/012004.

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Abstract Machining of fiber-reinforced composites produces delamination in the workpiece. In bidirectional long fiber fabric reinforced composites, delamination depends on different parameters. In this work, two parameters are studied: fiber orientation angle respect to machining direction and the distance of the warp yarn from the trimmed edge until the next dip below the crossing fill. This work defines angles relating fiber orientation with cutting and feed movements and their relations in a robust way, being applied to edge trimming and grooving operations. On the other hand, for Type II d

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47

Neagoe, Mircea, Maria M. Vatasescu, Radu G. Saulescu, and Nora Creanga. "On New High Performance Systems with Linear Actuators for Diurnal Orientation of PV Platforms." Applied Mechanics and Materials 162 (March 2012): 214–23. http://dx.doi.org/10.4028/www.scientific.net/amm.162.214.

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The paper presents new mechatronic systems used to perform the diurnal orientation of photovoltaic (PV) platforms, aiming to achieve high angular strokes and also low cost, high precision, constructive simplicity and relative low pressure angles. Starting from the disadvantages of the existing tracking mechanism identified in the literature (patents, scientific articles, market documentation, etc.), new high performance linkages and gear mechanisms driven by linear actuators are proposed in the paper. Hence, four new tracking mechanisms, achieving high angular strokes (over 180o), are describe

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48

Matsunaga, D., Y. Imai, C. Wagner, and T. Ishikawa. "Reorientation of a single red blood cell during sedimentation." Journal of Fluid Mechanics 806 (September 29, 2016): 102–28. http://dx.doi.org/10.1017/jfm.2016.601.

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The reorientation phenomenon of a single red blood cell during sedimentation is simulated using the boundary element method. The cell settles downwards due to a density difference between the internal and external fluids, and it changes orientation toward a vertical orientation regardless of Bond number or viscosity ratio. The reorientation phenomenon is explained by a shape asymmetry caused by the gravitational driving force, and the shape asymmetry increases almost linearly with the Bond number. When velocities are normalised by the driving force, settling/drifting velocities are weak functi

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49

Lafrance, Claude-Paul, Anne Nabet, Robert E. Prud'homme, and Michel Pézolet. "On the relationship between the order parameter and the shape of orientation distributions." Canadian Journal of Chemistry 73, no. 9 (1995): 1497–505. http://dx.doi.org/10.1139/v95-185.

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The molecular orientation is generally expressed by an "order parameter," [Formula: see text] which depends on both the angular position and the shape of the orientation distribution. This parameter is an average made over all orientations of the structural units studied in a sample and, consequently, a given [Formula: see text] value can correspond to different orientation distributions. In this article, model distributions are used to show the relationship between the shape, width, and angular position of the center of the orientation distribution on the [Formula: see text] coefficient, for

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50

D'Alessandro, A., and G. D'Anna. "Retrieval of Ocean Bottom and Downhole Seismic sensors orientation using integrated MEMS gyroscope and direct rotation measurements." Advances in Geosciences 40 (December 15, 2014): 11–17. http://dx.doi.org/10.5194/adgeo-40-11-2014.

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Abstract. The absolute orientation of the horizontal components of ocean bottom or downhole seismic sensors are generally unknown. Almost all the methods proposed to overcome this issue are based on the post-processing of the acquired signals and so the results are strongly dependent on the nature, quantity and quality of the acquired data. We have carried out several test to evaluate the ability of retrieve sensor orientation using integrated low cost MEMS gyroscope. Our tests have shown that the tested MEMS gyroscope (the model 1044_0–3/3/3 Phidget Spatial Precision High Resolution) can be u

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