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Journal articles on the topic 'Variables action-Angles'

Author: Grafiati

Published: 20 April 2024

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1

Monari, G., B. Famaey, J. B. Fouvry, and J. Binney. "Distribution functions for resonantly trapped orbits in our Galaxy." Proceedings of the International Astronomical Union 13, S334 (2017): 341–42. http://dx.doi.org/10.1017/s1743921317006688.

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AbstractWe show how to capture the behaviour of the phase-space distribution function (DF) of a Galactic disc stellar population at a resonance. This is done by averaging the Hamiltonian over fast angle variables and re-expressing the DF in terms of a new set of canonical actions and angles variables valid in the resonant region. We then assign to the resonant DF the time average along the orbits of the axisymmetric DF expressed in the new set of actions and angles. This boils down to phase-mixing the DF in terms of the new angles, such that the DF for trapped orbits only depends on the new se

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2

VIROVLYANSKY, A. L. "RAY CHAOS IN UNDERWATER ACOUSTIC WAVEGUIDES." International Journal of Bifurcation and Chaos 18, no. 09 (2008): 2693–700. http://dx.doi.org/10.1142/s0218127408021907.

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The chaotic motion of a ray path in a deep water acoustic waveguide with internal-wave-induced fluctuations of the sound speed is investigated. A statistical approach for the description of chaotic rays is discussed. The behavior of ray trajectories is studied using Hamiltonian formalism expressed in terms of action-angle variables. It is shown that the range dependence of the action variable of chaotic ray can be approximated by a random Wiener process. On the basis of this result, analytical expressions for probability density functions of ray parameters are derived. Distributions of coordin

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3

Zhu, W. Q., Z. L. Huang, and Y. Q. Yang. "Stochastic Averaging of Quasi-Integrable Hamiltonian Systems." Journal of Applied Mechanics 64, no. 4 (1997): 975–84. http://dx.doi.org/10.1115/1.2789009.

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A stochastic averaging method is proposed to predict approximately the response of quasi-integrable Hamiltonian systems, i.e., multi-degree-of-freedom integrable Hamiltonian systems subject to lightly linear and (or) nonlinear dampings and weakly external and (or) parametric excitations of Gaussian white noises. According to the present method an n-dimensional averaged Fokker-Planck-Kolmogrov (FPK) equation governing the transition probability density of n action variables or n independent integrals of motion can be constructed in nonresonant case. In a resonant case with α resonant relations,

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Famaey, B., G. Monari, A. Siebert, J. B. Fouvry, and J. Binney. "Distribution functions for Galactic disc stellar populations in the presence of non-axisymmetric perturbations." Proceedings of the International Astronomical Union 13, S334 (2017): 195–98. http://dx.doi.org/10.1017/s174392131700672x.

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AbstractThe present-day response of a Galactic disc stellar population to a non-axisymmetric perturbation of the potential, in the form of a bar or spiral arms, can be treated, away from the main resonances, through perturbation theory within the action-angle coordinates of the unperturbed axisymmetric system. The first order moments of such a perturbed distribution function (DF) in the presence of spiral arms give rise to non-zero radial and vertical mean stellar velocities, called breathing modes. Such an Eulerian linearized treatment however diverges at resonances. The Lagrangian approach t

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KOBE, DONALD H. "INVARIANCE OF THE GENERALIZED HANNAY ANGLE UNDER GAUGE TRANSFORMATIONS: APPLICATION TO THE TIME-DEPENDENT GENERALIZED HARMONIC OSCILLATOR." International Journal of Modern Physics B 07, no. 11 (1993): 2147–62. http://dx.doi.org/10.1142/s021797929300281x.

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The Hannay angle of classical mechanics is generalized so that it is invariant under gauge transformations, which are a restricted class of canonical transformations. A distinction between the Hamiltonian and the energy is essential to make in time-dependent problems. A time-dependent generalized harmonic oscillator with a cross term in the Hamiltonian is taken as an example. The Hamiltonian of this system is not in general the energy. The energy, the time derivative of which is the power, is obtained from the equation of motion and related to the action variable. Hamilton’s equations give the

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McGibbon, Chris A., and David E. Krebs. "Discriminating age and disability effects in locomotion: neuromuscular adaptations in musculoskeletal pathology." Journal of Applied Physiology 96, no. 1 (2004): 149–60. http://dx.doi.org/10.1152/japplphysiol.00422.2003.

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We identified biomechanical variables indicative of lower extremity dysfunction, distinct from age-related gait adaptations, and examined interrelationships among these variables to better understand the neuromuscular adaptations in gait. Sagittal plane ankle, knee, and hip peak angles, moments, and powers and spatiotemporal parameters were acquired during preferred-speed gait in 120 subjects: 45 healthy young, 37 healthy elders, and 38 elders with functional limitations due to lower extremity musculoskeletal pathology, primarily arthritis. Multiple analysis of covariance with discriminate ana

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Zhu, W. Q., and Y. Q. Yang. "Exact Stationary Solutions of Stochastically Excited and Dissipated Integrable Hamiltonian Systems." Journal of Applied Mechanics 63, no. 2 (1996): 493–500. http://dx.doi.org/10.1115/1.2788895.

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It is shown that the structure and property of the exact stationary solution of a stochastically excited and dissipated n-degree-of-freedom Hamiltonian system depend upon the integrability and resonant property of the Hamiltonian system modified by the Wong-Zakai correct terms. For a stochastically excited and dissipated nonintegrable Hamiltonian system, the exact stationary solution is a functional of the Hamiltonian and has the property of equipartition of energy. For a stochastically excited and dissipated integrable Hamiltonian system, the exact stationary solution is a functional of n ind

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Dmitriev, Vladimir G., Alexander N. Danilin, Anastasiya R. Popova, and Natalia V. Pshenichnova. "Numerical Analysis of Deformation Characteristics of Elastic Inhomogeneous Rotational Shells at Arbitrary Displacements and Rotation Angles." Computation 10, no. 10 (2022): 184. http://dx.doi.org/10.3390/computation10100184.

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Adequate mathematical models and computational algorithms are developed in this study to investigate specific features of the deformation processes of elastic rotational shells at large displacements and arbitrary rotation angles of the normal line. A finite difference method (FDM) is used to discretize the original continuum problem in spatial variables, replacing the differential operators with a second-order finite difference approximation. The computational algorithm for solving the nonlinear boundary value problem is based on a quasi-dynamic form of the ascertainment method with the const

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Fan, Zihao, Yang Xu, Yuhang Kang, and Delin Luo. "Air Combat Maneuver Decision Method Based on A3C Deep Reinforcement Learning." Machines 10, no. 11 (2022): 1033. http://dx.doi.org/10.3390/machines10111033.

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To solve the maneuvering decision problem in air combat of unmanned combat aircraft vehicles (UCAVs), in this paper, an autonomous maneuver decision method is proposed for a UCAV based on deep reinforcement learning. Firstly, the UCAV flight maneuver model and maneuver library of both opposing sides are established. Then, considering the different state transition effects of various actions when the pitch angles of the UCAVs are different, the 10 state variables including the pitch angle, are taken as the state space. Combined with the air combat situation threat assessment index model, a two-

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Hu, Zhizheng, Haifeng Zeng, Yun Ge, Wendong Wang, and Jiangkun Wang. "Simulation and Experiment of Gas-Solid Flow in a Safflower Sorting Device Based on the CFD-DEM Coupling Method." Processes 9, no. 7 (2021): 1239. http://dx.doi.org/10.3390/pr9071239.

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To study the movement characteristics and separation mechanism of safflower petals and their impurities under the action of airflow and lower the impurity rate in the cleaning operation process, integration of computational fluid dynamics (CFD) and discrete element method (DEM) codes was performed to study the motion and sorting behavior of impurity particles and safflower petals under different airflow inclination angles, dust removal angles and inlet airflow velocities by establishing a true particle model. In this model, the discrete particle phase was applied by the DEM software, and the c

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Dos’Santos, Thomas, Christopher Thomas, Alistair McBurnie, Paul Comfort, and Paul A. Jones. "Biomechanical Determinants of Performance and Injury Risk During Cutting: A Performance-Injury Conflict?" Sports Medicine 51, no. 9 (2021): 1983–98. http://dx.doi.org/10.1007/s40279-021-01448-3.

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Abstract Background Most cutting biomechanical studies investigate performance and knee joint load determinants independently. This is surprising because cutting is an important action linked to performance and non-contact anterior cruciate ligament (ACL) injuries. The aim of this study was to investigate the relationship between cutting biomechanics and cutting performance (completion time, ground contact time [GCT], exit velocity) and surrogates of non-contact ACL injury risk (knee abduction [KAM] and internal rotation [KIRM] moments) during 90° cutting. Design Mixed, cross-sectional study f

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Avramov, K. V., N. H. Sakhno, and B. V. Uspensky. "Transient dynamic response of a nanocomposite conical shell with a ring stiff-ener under the action of an impact load." Technical mechanics 2020, no. 3 (2020): 64–78. http://dx.doi.org/10.15407/itm2020.03.064.

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This work is devoted to the study of transient processes occurring in a nanocomposite shell with a ring stiffener under the action of an impact load. Nanocomposites are promising new materials for the aerospace industry. However, the analysis of dynamic processes in nanocomposite structures requires the development of new methods due to the anisotropic, functional-gradient nature of these materials. The problem is further complicated if a composed structure is to be analyzed. This paper proposes a model of deformation of a functionally graded composite conical shell reinforced with carbon nano

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Demareva, A. V. "ANALYSIS OF THE CONSERVATIVE SMOOTHING EFFECT ON THE ACCURACY OF DYNAMIC ELASTIC-PLASTIC SPHERICAL SHELLS BUCKLING NUMERICAL SIMULATION." Problems of strenght and plasticity 81, no. 4 (2019): 474–87. http://dx.doi.org/10.32326/1814-9146-2019-81-4-474-487.

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Large changes of a lead spherical shell enclosed in an aluminum spacesuit under the action of an overload pulse are considered. The defining system of equations is formulated in Lagrange variables in a two-dimensional (axisymmetric) formulation. Strain and stress rates are determined in the local coordinate system. Kinematic relations are recorded in the metric of the current state. The relations of the flow theory with isotropic hardening are used as state equations. The contact interaction of the shell and the spacesuit is modeled by non-penetration conditions taking into account friction. T

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Demareva, A. V. "ANALYSIS OF THE CONSERVATIVE SMOOTHING EFFECT ON THE ACCURACY OF DYNAMIC ELASTIC-PLASTIC SPHERICAL SHELLS BUCKLING NUMERICAL SIMULATION." Problems of strenght and plasticity 81, no. 4 (2019): 475–88. http://dx.doi.org/10.32326/1814-9146-2019-81-4-475-488.

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Large changes of a lead spherical shell enclosed in an aluminum spacesuit under the action of an overload pulse are considered. The defining system of equations is formulated in Lagrange variables in a two-dimensional (axisymmetric) formulation. Strain and stress rates are determined in the local coordinate system. Kinematic relations are recorded in the metric of the current state. The relations of the flow theory with isotropic hardening are used as state equations. The contact interaction of the shell and the spacesuit is modeled by non-penetration conditions taking into account friction. T

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Monari, G., B. Famaey, A. Siebert, C. Wegg, and O. Gerhard. "Signatures of the resonances of a large Galactic bar in local velocity space." Astronomy & Astrophysics 626 (June 2019): A41. http://dx.doi.org/10.1051/0004-6361/201834820.

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The second data release of the Gaia mission has revealed a very rich structure in local velocity space. In terms of in-plane motions, this rich structure is also seen as multiple ridges in the actions of the axisymmetric background potential of the Galaxy. These ridges are probably related to a combination of effects from ongoing phase-mixing and resonances from the spiral arms and the bar. We have recently developed a method for capturing the behaviour of the stellar phase-space distribution function at a resonance by re-expressing it in terms of a new set of canonical actions and angles vari

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Kasper, S. "Depression." European Psychiatry 26, S2 (2011): 2186. http://dx.doi.org/10.1016/s0924-9338(11)73889-5.

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Depression is one of the thoroughly evaluated diseases in psychiatry with regard to diagnosis as well as treatment variables. Like in other medical conditions, early treatment should be aimed and watchful waiting which is for instance also not done in the treatment of high blood pressure or diabetes, has not been proven to be a sophisticated approach based on neurobiological considerations. Like in other diseases, it is apparent that days of untreated depression may result in brain damage like reduced volume size of the hypocampus. The course of illness of depression shows that life events are

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17

Fan, Chao, and Zhe Wang. "Spatiotemporal Characterization of Land Cover Impacts on Urban Warming: A Spatial Autocorrelation Approach." Remote Sensing 12, no. 10 (2020): 1631. http://dx.doi.org/10.3390/rs12101631.

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There has been an increasing concern of rising temperatures as cities continue to expand and intensify. Urban warming is having significant impacts on the environment that are far beyond city limits. Understanding the development pattern of the urban heat island (UHI) effect is crucial for making action plans to mitigate urban warming. In this study, we combine multitemporal satellite imagery, spatial autocorrelation indices, and statistical analysis into a spatiotemporal study of the surface UHI effect in the Boise-Meridian metropolitan area. A continuous landscape modeling perspective was ta

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Trick, Wilma H. "Identifying resonances of the Galactic bar in Gaia DR2: II. Clues from angle space." Monthly Notices of the Royal Astronomical Society 509, no. 1 (2021): 844–65. http://dx.doi.org/10.1093/mnras/stab2866.

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ABSTRACT The Milky Way disc exhibits intricate orbit substructure of still debated dynamical origin. The angle variables (θϕ, θR) – which are conjugates to the actions (L$z$, JR), and describe a star’s location along its orbit – are a powerful diagnostic to identify l:m resonances via the orbit shape relation ΔθR/Δθϕ = −m/l. In the past, angle signatures have been hidden by survey selection effects (SEs). Using test particle simulations of a barred galaxy, we demonstrate that Gaia should allow us to identify the Galactic bar’s outer Lindblad resonance (OLR;l = +1, m = 2) in angle space. We inv

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CLARK, JEFFREY, PHIL CRANDALL, and JESSICA SHABATURA. "Wearable Technology Effects on Training Outcomes of Restaurant Food Handlers." Journal of Food Protection 81, no. 8 (2018): 1220–26. http://dx.doi.org/10.4315/0362-028x.jfp-18-033.

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ABSTRACT Food safety training does not always result in behavior change, perhaps because of flaws inherent in traditional training designs. New technologies such as augmented reality headsets or head-mounted action cameras could transform the way food safety training is conducted in the food industry. Training conducted with wearable technology presents visual content in the first-person or actor's perspective, as opposed to the traditional third-person or observer perspective. This visual hands-on first-person perspective may provide an effective way of conveying information and encouraging b

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Mua, Kang Edwin, and Kometa Sunday Shende. "The Response of Stream Competence to Topographic and Seasonal Variations in The Bamenda-Menchum Drainage Basin, North West Region, Cameroon." Journal of Geography and Geology 11, no. 2 (2019): 21. http://dx.doi.org/10.5539/jgg.v11n2p21.

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The flow direction of streams remains an establishing mechanism in understanding drainage basin function and stream competence. The ability of streams to erode, transport and deposit loads in fluvial geomorphology exert a benchmark precursor for slope dynamics given the differential geological outcrop of the Bamenda-Menchum basin. Such competence in stream network generates slope instability as materials continuously move down slope from the volcanic escarpment face of Bamenda highlands to the sedimentary lowland area of Lower Bafut-Menchum basin. This paper investigate the influence of stream

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Betkier, Igor, Szymon Mitkow, and Magdalena Kijek. "Analysis of vehicle stability loss due to strong crosswind gusts using web services in the route planning process." Archives of Transport 52, no. 4 (2019): 47–56. http://dx.doi.org/10.5604/01.3001.0014.0207.

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Weather conditions play a significant role in road safety. One of its component is a wind influence, which may be affected the moving vehicle from different angles. The final result of such action can take typical kinds of behavior like overturn, slideslip and rotation. Accordingly, vehicles with high side profile are particularly vulnerable to such specific phenomena, what made the planning process more difficult and complex. The article analyses possibilities of a stability loss of a truck vehicle due to strong crosswind gusts. The authors synthesized the model proposed in the literature wit

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Harara, Mitsuhiko, Hidekazu Suzuki, Tsuyoshi Takeo, and Keiji Isoda. "Vehicle Dynamics Control with Variable Alignment Suspension." Journal of Robotics and Mechatronics 7, no. 4 (1995): 301–6. http://dx.doi.org/10.20965/jrm.1995.p0301.

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This study discusses the effect of variable alignment control suspension on vehicle dynamics by altering the suspension arm's length. In this system, two of the four arms of the front multi-link suspension can extend or contract depending on each driving condition to control the camber and caster angles independently. a camber angle and a caster angle are altered by the action of upper and lower control actuators. The camber angle control contributes to the increase in a turning limit with the improvement of tire footprints condition, and the caster angle and caster trail control aid the wheel

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Lebedev, Alexander. "The Synthesis of Variable Structure System for the Control of Quadrotor Spatial Motion." Applied Mechanics and Materials 865 (June 2017): 486–91. http://dx.doi.org/10.4028/www.scientific.net/amm.865.486.

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The method of the synthesis of multi-channel decentralized variable structure system for the control of quadrotor spatial motion is developed in this paper. The control law based on the formation of the sliding mode in the separate subsystems of each coordinates control is formed. Each subsystem includes two loops for Cartesian coordinates and relevant Euler angles control. The conditions of the existence of stable sliding mode are obtained. These conditions take into account essential dynamic reciprocal effect between all control channels. The application of proposed control law provides high

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Van Hees, Valérie, Ronny Bruffaerts, and Maarten Vansteenkiste. "Student mental health: towards sustainable community of caring approach based on the public mental health perspective." International Journal of Integrated Care 23, S1 (2023): 327. http://dx.doi.org/10.5334/ijic.icic23457.

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Attending university can be stressful and involve significant lifestyle changes: adjusting to the demands of a new learning environment, interacting with a diverse range of new people and environments, and (coping with) being away from trusted support networks. Although sixty per cent of students navigate higher education without emotional problems, forty per cent experience mental health issues, and approximately one in five struggles with mental disorders. Against this background, the Flemish Community (Belgium) has rolled out a sustainable student mental health strategy which ta

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Moura, Michel dos Santos, Aldir Carpes Marques Filho, Carlos Roberto Souza Carmo, Liliane Catarina Pereira, and Kléber Pereira Lanças. "INFLUÊNCIA DO ÂNGULO DE CORTE E DA VELOCIDADE DE COLHEITA NOS DANOS CAUSADOS PELAS FACAS DA COLHEDORA NA CULTURA DA CANA-DE-AÇÚCAR." ENERGIA NA AGRICULTURA 37, no. 1 (2022): 52–63. http://dx.doi.org/10.17224/energagric.2022v37n1p52-63.

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INFLUÊNCIA DO ÂNGULO DE CORTE E DA VELOCIDADE DE COLHEITA NOS DANOS CAUSADOS PELAS FACAS DA COLHEDORA NA CULTURA DA CANA-DE-AÇÚCAR Michel dos Santos Moura1, Aldir Carpes Marques Filho2, Carlos Roberto Souza Carmo3, Liliane Catarina Pereira4, Kléber Pereira Lanças5 1 Departamento de Engenharia Rural, Faculdade de Ciências Agronômicas – UNESP, Avenida Universitária 3780, Altos do Paraiso, CEP 18610-034, Botucatu, São Paulo, Brasil, e-mail. michelsmoura@gmail.com 2 Departamento de Engenharia Agrícola, Universidade Federal de Lavras, Trevo Prof. Edmir Sá Santos s/n, Aquenta Sol, CEP 37200-900, Lav

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Pinheiro, Guilherme de Sousa, Xing Jin, Varley Teoldo Da Costa, and Martin Lames. "Body Pose Estimation Integrated With Notational Analysis: A New Approach to Analyze Penalty Kicks Strategy in Elite Football." Frontiers in Sports and Active Living 4 (March 10, 2022). http://dx.doi.org/10.3389/fspor.2022.818556.

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Body orientation of football players has proven to be an informative resource related to successful penalty kicks. OpenPose is one of the most popular open-source pose estimation technologies. This study aims: (i) to verify whether OpenPose can detect relevant body orientation angles from video data of penalty kicks in elite football and (ii) to investigate the relationship between these body angles and observable behaviors analyzed via an observational system for penalty kick analysis in football (OSPAF) with the penalty taker and goalkeeper strategy. A total of 34 penalty videos, with standa

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Lili, Lamprini, Katharina S Sunnerhagen, Tiina Rekand, and Margit Alt Murphy. "Associations between upper extremity functioning and kinematics in people with spinal cord injury." Journal of NeuroEngineering and Rehabilitation 18, no. 1 (2021). http://dx.doi.org/10.1186/s12984-021-00938-9.

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Abstract Introduction More knowledge of the relationships between kinematic measures and clinical assessments is required to guide clinical decision making and future research. Objectives To determine which kinematic variables obtained during a drinking task were associated with clinical assessments of upper extremity functioning in people with spinal cord injury (SCI). Methods In total, 25 individuals with chronic cervical (n = 17) or thoracic (n = 8) complete (n = 14) or motor incomplete (n = 11) SCI (mean age 58.4, SD 13.8) were included. Kinematic data, including movement time, smoothness

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Jia, Wantao, Weiqiu Zhu, Yong Xu, and Weiyan Liu. "Stochastic Averaging of Quasi-Integrable and Resonant Hamiltonian Systems Under Combined Gaussian and Poisson White Noise Excitations." Journal of Applied Mechanics 81, no. 4 (2013). http://dx.doi.org/10.1115/1.4025141.

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A stochastic averaging method for quasi-integrable and resonant Hamiltonian systems subject to combined Gaussian and Poisson white noise excitations is proposed. The case of resonance with α resonant relations is considered. An (n + α)-dimensional averaged Generalized Fokker–Plank–Kolmogorov (GFPK) equation for the transition probability density of n action variables and α combinations of phase angles is derived from the stochastic integrodifferential equations (SIDEs) of original quasi-integrable and resonant Hamiltonian systems by using the jump-diffusion chain rule. The reduced GFPK equatio

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PAULA, GUSTAVO BRUNO DE, BRÉSCIA FRANÇA NONATO, and CLÁUDIO MARQUES MARTINS NOGUEIRA. "AFFIRMATIVE ACTIONS AND HORIZONTAL STRATIFICATION: COMPARISON BETWEEN BONUS AND QUOTAS ACT AT THE UFMG." Educação em Revista 39 (2023). http://dx.doi.org/10.1590/0102-469837918t.

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ABSTRACT: In this article, we analyze the effects of two affirmative action policies adopted by the Federal University of Minas Gerais (UFMG): the bonus policy and the Quota Act. We compare the social inclusion produced by them by two angles: the access itself to UFMG and the distribution of the target groups among the institution’s programs, considering its internal horizontal hierarchy. We verify the changes in the student`s profile by focusing on three variables: race, school origin and family income. Based on descriptive statistics, it is concluded that the two policies had relevant effect

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Danesi, Veronica, Ugo Locatelli, and Marco Sansottera. "Existence proof of librational invariant tori in an averaged model of HD60532 planetary system." Celestial Mechanics and Dynamical Astronomy 135, no. 3 (2023). http://dx.doi.org/10.1007/s10569-023-10132-9.

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AbstractWe investigate the long-term dynamics of HD60532, an extrasolar system hosting two giant planets orbiting in a 3:1 mean motion resonance. We consider an average approximation at order one in the masses which results (after the reduction in the constants of motion) in a resonant Hamiltonian with two libration angles. In this framework, the usual algorithms constructing the Kolmogorov normal form approach do not easily apply and we need to perform some untrivial preliminary operations, in order to adapt the method to this kind of problems. First, we perform an average over the fast angle

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Rubin, T., J. M. Rax, and N. J. Fisch. "Guiding centre motion for particles in a ponderomotive magnetostatic end plug." Journal of Plasma Physics 89, no. 6 (2023). http://dx.doi.org/10.1017/s0022377823001307.

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The Hamiltonian dynamics of a single particle in a rotating plasma column, interacting with an magnetic multipole is perturbatively solved for up to second order, using the method of Lie transformations. First, the exact Hamiltonian is expressed in terms of canonical action-angle variables, and then an approximate integrable Hamiltonian is introduced, using another set of actions and angles, which describe the centre of oscillation for the particle. The perturbation introduces an effective ponderomotive potential, which to leading order is positive. At the second order, the pseudopotential con

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Riveros-Perez, Efrain, Lori Bolgla, Nianlan Yang, Bibiana Avella-Molano, Camila Albo, and Alexander Rocuts. "Effect of table inclination angle on videolaryngoscopy and direct laryngoscopy: Operator’s muscle activation and laryngeal exposure analysis." BMC Anesthesiology 22, no. 1 (2022). http://dx.doi.org/10.1186/s12871-022-01849-5.

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Abstract Background Optimal vocal cord visualization depends on the patient’s anatomical factors, characteristics of the laryngoscope, and the operator’s muscle action. This study evaluated the effect of table inclination and three different laryngoscopic methods on procedural variables. The primary aim of this study is to compare differences in laryngoscopic view among clinicians based on the instrument used and table orientation. The secondary aim is to determine differences in upper extremity muscle activity based on laryngoscope use and table inclination. Methods Fifty-five anesthesia prov

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"The wing beat of Drosophila Melanogaster . III. Control." Philosophical Transactions of the Royal Society of London. B, Biological Sciences 327, no. 1238 (1990): 45–64. http://dx.doi.org/10.1098/rstb.1990.0042.

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Two major problems have to be solved by a flying animal or machine, (i) On the time average, flight force has to be produced which is sufficient to keep the body airborne and to propel it through the air. (ii) To stabilize a given position or trajectory, the vector of the generated flight force has to be controlled in its magnitude, orientation and position relative to the body. In the present study, the response of wing-beat kinematics to wind and visual stimuli was investigated in tethered flying Drosophila melanogaster . When the fly is subjected to an air stream in a wind tunnel, or to str

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Xu, X. D., G. G. Chen, S. Li, and T. G. Lv. "Design and dry wind tunnel test of progressive flexible variable bending wing." Aeronautical Journal, July 11, 2023, 1–26. http://dx.doi.org/10.1017/aer.2023.59.

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Abstract The deformable wing structure can change its aerodynamic shape according to the change of flight mission and flight environment, so as to obtain better lift-drag, stability and control characteristics, which is considered as one of the future research directions of aviation technology. Considering the current technology maturity and reliability, a gradient corrugated fin is designed to realise the bending deformation of the wing. The structure of the skin is optimised to keep the skin smooth during deformation. In addition, a progressive push and pull rod is proposed to drive the wing

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Aslanov, Vladimir S. "Attitude Motion of Cylinder in Variable Electrostatic Field Near L1 Libration Point." Journal of Spacecraft and Rockets, February 27, 2023, 1–12. http://dx.doi.org/10.2514/1.a35635.

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This paper explores the spatial attitude motion of an electrostatic cylindrical container (E container) in a variable attracting electrostatic field. This field generated by the E container and the orbiting spacecraft (orbiter) located at the L1 libration point of the Mars–Phobos system is used to capture the E container by the orbiter in the Phobos Sample Return mission. Based on the Lagrange formalism and using the Euler angles, the equations of attitude motion of a cylindrical E container are constructed in the framework of the circular restricted three-body problem with the addition of the

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