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Artykuły w czasopismach na temat „Bonn motion”

Autor: Grafiati

Data publikacji: 5 czerwca 2025

Data aktualizacji: 1 sierpnia 2025

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1

Tucholke, H. J., P. Brosche, and M. Geffert. "Absolute Proper Motions and Space Velocities of Globular Clusters." Symposium - International Astronomical Union 126 (1988): 525–26. http://dx.doi.org/10.1017/s0074180900042935.

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Proper motions of globular clusters referred to extragalactic background objects provide absolute proper motions leading to space velocities. Some results from the Bonn Observatory proper motion program for galactic globular clusters are shown. Reference stars from the Lick program linked to galaxies are used. Low orbital angular momenta for NGC 4147, NGC 5466 and NGC 6218 were detected. In a further program, proper motions of 47 Tuc and NGC 362 are currently being measured relative to the background of the SMC.

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Schilbach, E., J. Guibert, M. Geffert, and S. Hirte. "A New Proper Motion Survey of the Pleiades Cluster." Symposium - International Astronomical Union 156 (1993): 255–60. http://dx.doi.org/10.1017/s0074180900173309.

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A programme for the determination of proper motions and photographic B, V, R magnitudes for stars up to 18m within a 4° by 4° region centered near Alcyone is described. We use MAMA measurements of plates taken with Tautenburg and OCA Schmidt telescopes as well as with the double refractor of Bonn and Carte du Ciel plates. To check the stability of the solution three different methods of reduction are applied.According to the results of the pilot programme a final proper motion accuracy of about 2 mas/a can be achieved for the majority of stars in the survey.

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Tucholke, H. J., P. Brosche, and M. Odenkirchen. "The Bonn contribution to the extragalactic link of the Hipparcos proper motion system." Astronomy and Astrophysics Supplement Series 122, no. 3 (1997): 433–40. http://dx.doi.org/10.1051/aas:1997145.

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Platais, I., V. Kozhurina-Platais, M. Geffert, and V. N. Frolov. "Peripheral Members of M67." Symposium - International Astronomical Union 164 (1995): 399. http://dx.doi.org/10.1017/s0074180900109167.

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Despite enormous effort put into the membership determination of M67, we do not know very well its peripheral members. Since the Bonn double astrograph as well as Pulkovo normal astrograph plates cover nearly 1°.5 × 1°.5 on the sky we have combined newly derived astrometric data from both instruments. Nearly 2,000 stars were measured down to the plate limit B ≈ 16.5. The proper–motion standard error for well-measured stars is ±0.3 mas/yr. For the membership probability solution we selected only 1363 stars, all brighter than V ≈ 15.0, with good proper motions. The membership solution yielded 44

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5

Chen, Hong, Hongdong Zhao, Baoqiang Qi, Shi Wang, Nan Shen, and Yuxiang Li. "Human motion recognition based on limit learning machine." International Journal of Advanced Robotic Systems 17, no. 5 (2020): 172988142093307. http://dx.doi.org/10.1177/1729881420933077.

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With the development of technology, human motion capture data have been widely used in the fields of human–computer interaction, interactive entertainment, education, and medical treatment. As a problem in the field of computer vision, human motion recognition has become a key technology in somatosensory games, security protection, and multimedia information retrieval. Therefore, it is important to improve the recognition rate of human motion. Based on the above background, the purpose of this article is human motion recognition based on extreme learning machine. Based on the existing action f

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6

Yan, Li, Xiao Hu, Leyang Zhao, Yu Chen, Pengcheng Wei, and Hong Xie. "DGS-SLAM: A Fast and Robust RGBD SLAM in Dynamic Environments Combined by Geometric and Semantic Information." Remote Sensing 14, no. 3 (2022): 795. http://dx.doi.org/10.3390/rs14030795.

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Visual Simultaneous Localization and Mapping (VSLAM) is a prerequisite for robots to accomplish fully autonomous movement and exploration in unknown environments. At present, many impressive VSLAM systems have emerged, but most of them rely on the static world assumption, which limits their application in real dynamic scenarios. To improve the robustness and efficiency of the system in dynamic environments, this paper proposes a dynamic RGBD SLAM based on a combination of geometric and semantic information (DGS-SLAM). First, a dynamic object detection module based on the multinomial residual m

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7

Huai, Shuo, Long Cao, Yang Zhou, Zhiyang Guo, and Jingyao Gai. "A Multi-Strategy Visual SLAM System for Motion Blur Handling in Indoor Dynamic Environments." Sensors 25, no. 6 (2025): 1696. https://doi.org/10.3390/s25061696.

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Typical SLAM systems adhere to the assumption of environment rigidity, which limits their functionality when deployed in the dynamic indoor environments commonly encountered by household robots. Prevailing methods address this issue by employing semantic information for the identification and processing of dynamic objects in scenes. However, extracting reliable semantic information remains challenging due to the presence of motion blur. In this paper, a novel visual SLAM algorithm is proposed in which various approaches are integrated to obtain more reliable semantic information, consequently

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8

Lafuente Balle, José María. "El art. 155 de la Constitución española: examen doctrinal y comparado // Section 155 of the Spanish Constitution: doctrinal and comparative examination." Revista de Derecho Político 1, no. 102 (2018): 79. http://dx.doi.org/10.5944/rdp.102.2018.22389.

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Resumen:El art. 155 de la Constitución regula la coerción federal (federal coercion) con un texto inspirado en el art. 37 de la Ley Fundamental de Bonn, si bien presenta alguna importante diferencia, particularmente por la distinta configuración electoral del Senado y el Bundesrat. Su redacción es un ejemplo característico de la ambigüedad propia de los preceptos constitucionales; y su interpretación padece de que carece de desarrollo legislativo y precedentes históricos. Con su Resolución de 27 de octubre de 2017, el Senado ha aplicado por vez primera el art. 155 por entender que la Generalit

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9

Lafuente Balle, José María. "El art. 155 de la Constitución española (el Acuerdo del Senado) // Section 155 of the Spanish Constitution. The Order of the Spanish Senate of 27th of October, 2017." Revista de Derecho Político 1, no. 103 (2018): 77. http://dx.doi.org/10.5944/rdp.103.2018.23198.

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Resumen:El art. 155 de la Constitución regula la coerción federal (federal coercion) con un texto inspirado en el art. 37 de la Ley Fundamental de Bonn, si bien presenta alguna importante diferencia, particularmente por la distinta configuración electoral del Senado y el Bundesrat. Su redacción es un ejemplo característico de la ambigüedad propia de los preceptos constitucionales; y su interpretación padece de que carece de desarrollo legislativo y precedentes históricos. Con su Resolución de 27 de octubre de 2017, el Senado ha aplicado por vez primera el art. 155 por entender que la Generalit

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10

Kovalevsky, J. "Optical-Radio Reference Ties." International Astronomical Union Colloquium 165 (1997): 447–48. http://dx.doi.org/10.1017/s0252921100046935.

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In the course of the Hipparcos data reduction, the system of coordinates obtained is the result of complicated and partly random processes. It is therefore an arbitrary system which could not be retained. It was decided to compute a rotation ϵ at epoch (1991.25) and a time-dependent rotation ω (or spin) such that, when applied, it would be a realisation of the IAU extragalactic reference system as defined in 1991 and implemented by IERS in 1995.A working group was set up by the Hipparcos Science Team with the task to provide these rotations from all possible techniques. Actually eleven indepen

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11

Lichanot, A., P. Azavant, and U. Pietsch. "Ab initio Hartree–Fock study of the electronic charge density of the cubic boron nitride and its comparison with experiments." Acta Crystallographica Section B Structural Science 52, no. 4 (1996): 586–95. http://dx.doi.org/10.1107/s0108768196002686.

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The electronic charge density of cubic boron nitride is calculated within the ab initio Hartree–Fock approximation using the program CRYSTAL. Based on Debye hypothesis, the thermal motion of atoms is considered by disturbing the atomic orbitals by mean-square displacements given from experiment. The calculated difference charge density obtained by subtraction of the total density and that of an independent atomic model (IAM) is characterized by a charge-density accumulation between next neighbours slightly shifted towards the nitrogen. The calculated X-ray structure amplitudes are compared wit

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12

Lasefr, Zakareya, Khaled Elleithy, Ramasani Rakesh Reddy, Eman Abdelfattah, and Miad Faezipour. "An Epileptic Seizure Detection Technique Using EEG Signals with Mobile Application Development." Applied Sciences 13, no. 17 (2023): 9571. http://dx.doi.org/10.3390/app13179571.

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Epileptic seizure detection classification distinguishes between epileptic and non-epileptic signals and is an important step that can aid doctors in diagnosing and treating epileptic seizures. In this paper, we studied the existing epileptic seizure detection methods in terms of challenges and processes developed based on electroencephalograph (EEG) signals. To identify the research deficiencies and provide a feasible solution, we surveyed the existing techniques at each phase, including signal acquisition, pre-processing, feature extraction, and classification. Most previous and current rese

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13

Monroe, John F., and Richard W. Marklin. "Quantitative Biomechanical Analysis of Wrist Motion in Bone-Trimming Jobs in the Red-Meat Packing Industry." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 39, no. 10 (1995): 595–99. http://dx.doi.org/10.1177/154193129503901012.

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This study was motivated by the serious impact that cumulative trauma disorders (CTDs) of the upper extremities have on industrial workers and on industry itself. To date, no quantitative data has been gathered on the kinematics of hand and wrist motion required in bone-trimming jobs in the red-meat packing industry. No information is known about what type and how much wrist motion is currently being used in bone-trimming jobs in the red-meat packing industry, or how much these motions increase the risk of occupational CTDs. The research conducted addressed this current research void and estab

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14

Schachinger, Florian, Barbara Pobatschnig, Andreas Kranzl, Alexandra Stauffer, and Sebastian Farr. "Outcomes of patients with single-bone-forearm surgery: a clinical assessment and three-dimensional motion analysis." Journal of Hand Surgery (European Volume) 44, no. 8 (2019): 838–44. http://dx.doi.org/10.1177/1753193419852609.

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The creation of a single-bone-forearm is a salvage procedure to stabilize the forearm. The purpose of this study was to investigate clinical outcomes and how these patients compensate for the lack of forearm rotation. We evaluated four patients (three children, one adult) who had undergone single-bone-forearm surgery. Patients were examined clinically and with three-dimensional motion analysis. We found these patients are generally capable to perform important activities of daily living (e.g. glass jug pouring), which would normally need forearm rotation. Motion analysis revealed remarkable co

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15

Sigl-Kraetzig, Michael, Stefan Bauerfeindt, Amanda Wildner, and Axel Seuser. "Standardized Ultrasonography (HEAD-US) of Joints and First Correlation with Function in Haemophilic Arthropathy: Results of a Clinical Trial and Potential Importance of Joint-Ultrasound for an Individualized Prophylaxis in Haemophiliacs." Blood 126, no. 23 (2015): 3541. http://dx.doi.org/10.1182/blood.v126.23.3541.3541.

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Abstract Background: Sonography is applied in patients with bleeding disorders. By ultrasonography the extent of synovitis is detected as a sign of the activity of an existing hemophilic arthropathy, as a sign of progression are defects of articular cartilage and bony structures quantifiable. In 2013 an easy-to-use standardized ultrasound protocol (HEAD-US) for examination of early joint changes in Hemophilic Arthropathy was published. Correlation between functional and structural changes in Haemophilic Arthropathy was not published before. Aims: The sonographic quantification of the arthropat

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16

Mei, Feng, Qian Hu, Changxuan Yang, and Lingfeng Liu. "ARMA-Based Segmentation of Human Limb Motion Sequences." Sensors 21, no. 16 (2021): 5577. http://dx.doi.org/10.3390/s21165577.

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With the development of human motion capture (MoCap) equipment and motion analysis technologies, MoCap systems have been widely applied in many fields, including biomedicine, computer vision, virtual reality, etc. With the rapid increase in MoCap data collection in different scenarios and applications, effective segmentation of MoCap data is becoming a crucial issue for further human motion posture and behavior analysis, which requires both robustness and computation efficiency in the algorithm design. In this paper, we propose an unsupervised segmentation algorithm based on limb-bone partitio

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17

Heidari, Milad, and Pooyan Rahmanivahid. "Effect of linkage design of an elbow implant on micro-motion: a finite element analysis." International Journal of Engineering & Technology 9, no. 2 (2020): 390. http://dx.doi.org/10.14419/ijet.v9i2.30372.

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The major reason for total elbow arthroplasty failure is loosening. Loosening is the outcome of a detrimental mechanical incident, which causes the failure of the bond between the bone bed and implant. The shape of the linkage of an elbow implant has a considerable role to transfer a portion of the load to the cement-bone and cement-implant interfaces. Therefore, in this study, the linkage of an elbow implant was modified to reduce loosening using finite element analyses. Elbow bone was constructed using image processing software. Linkage components were modeled using modeling computer-aided d

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18

Sethi, Surabhi. "‘Ayushman Bharat is a Boon for the Country’: Against the Motion." International Journal of Preventive, Curative & Community Medicine 05, no. 03 (2019): 36–40. http://dx.doi.org/10.24321/2454.325x.201915.

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U, Venkatesh. "‘Ayushman Bharat is a Boon for the Country’: For the Motion." International Journal of Preventive, Curative & Community Medicine 05, no. 03 (2019): 31–35. http://dx.doi.org/10.24321/2454.325x.201916.

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Arimoto, Sasaki, Doi, and Kim. "Ultrasonic Bonding of Multi-Layered Foil Using a Cylindrical Surface Tool." Metals 9, no. 5 (2019): 505. http://dx.doi.org/10.3390/met9050505.

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A cylindrical tool was applied for ultrasonic bonding of multi-layered copper foil and a copper sheet to prevent damage to the foil during bonding. The strength of the joints bonded with the cylindrical tool was comparable to that of the joints bonded with a conventional knurled tool. The effect of the cylindrical surface tool on bondability was investigated thorough relative motion behaviors between the tool surface and the bonding materials, as well as on bond microstructure evolution. The relative motion was visualized with in-situ observation using a high-speed camera and digital image cor

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21

Cristian, P. Saavedra Cañar, J. Tucker Yépez John, and M. Roa López Heydi. "Performance of Reactive Routing Protocols DSR and AODV in Vehicular Ad-Hoc Networks Based on Quality of Service (Qos) Metrics." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 4 (2020): 2033–39. https://doi.org/10.35940/ijeat.C6608.049420.

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This article analyzes and compares the service quality metrics in reactive routing protocols AODV and DSR in VANET. Through the revision of the recorded information we study the characteristics, classification, applications and different traffic models. All these parameters are taken into account in the modelling of vehicular traffic in the downtown of Loja City. In order to get the corresponding results, three different scenarios each with a different node density have been created. According to the collected data, it is possible to verify which routing protocol is the most suitable for the A

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Ng, Hong-Wan, Ee-Chon Teo, and Qinghang Zhang. "Influence of Cervical Disc Degeneration after Posterior Surgical Techniques in Combined Flexion-Extension—A Nonlinear Analytical Study." Journal of Biomechanical Engineering 127, no. 1 (2005): 186–92. http://dx.doi.org/10.1115/1.1835364.

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Laminectomy and facetectomy are surgical techniques used for decompression of the cervical spinal stenosis. Recent in vitro and finite element studies have shown significant cervical spinal instability after performing these surgical techniques. However, the influence of degenerated cervical disk on the biomechanical responses of the cervical spine after these surgical techniques remains unknown. Therefore, a three-dimensional nonlinear finite element model of the human cervical spine (C2–C7) was created. Two types of disk degeneration grades were simulated. For each grade of disk degeneration

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23

Ishida, Hiroyuki, Tatsuo Higashiyama, Naomi Hayama, and Ryuichi Ikeda. "1H NMR Studies on Cationic Motions in Solid tert-Butylammonium Hexachlorostannate (IV)." Zeitschrift für Naturforschung A 47, no. 10 (1992): 1087–90. http://dx.doi.org/10.1515/zna-1992-1013.

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AbstractThe temperature dependences of the 1H spin-lattice relaxation time (T1) and the second moment (M2) of NMR absorptions were measured for anhydrous tert-butylammonium hexachlorostannate(IV) and its partially deuterated analogs [(CD3)3CNH3]2SnCl6 and [(CH3)3CND3]2SnCl6. Three kinds of cationic motions were revealed: the reorientations of the CH3 group about their C - C bonds, the NH+3 group about its C - N bond, and the tert-butyl group about the C - N bond. Their motional parameters were determined. Among the three motions, the NH+3 motion occurs at the lowest temperature with quite a sm

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Aliaj, Klevis, Gentry M. Feeney, Balakumar Sundaralingam, et al. "Replicating dynamic humerus motion using an industrial robot." PLOS ONE 15, no. 11 (2020): e0242005. http://dx.doi.org/10.1371/journal.pone.0242005.

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Transhumeral percutaneous osseointegrated prostheses provide upper-extremity amputees with increased range of motion, more natural movement patterns, and enhanced proprioception. However, direct skeletal attachment of the endoprosthesis elevates the risk of bone fracture, which could necessitate revision surgery or result in loss of the residual limb. Bone fracture loads are direction dependent, strain rate dependent, and load rate dependent. Furthermore, in vivo, bone experiences multiaxial loading. Yet, mechanical characterization of the bone-implant interface is still performed with simple

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25

Zhang, Minghao, Wen Xiao, Cunlin Zhang, and Liangliang Zhang. "Terahertz Kerr Effect of Liquids." Sensors 22, no. 23 (2022): 9424. http://dx.doi.org/10.3390/s22239424.

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In recent years, tremendous advancements have been made in various technologies such as far-infrared, low-frequency Raman, and two-dimensional (2D) Raman terahertz (THz) spectroscopies. A coherent method has emerged from numerous experimental and theoretical investigations of molecular dynamics in liquids by comparing linear and non-linear spectroscopic techniques. Intermolecular hydrogen bond vibration, molecular reorientation motion, and interaction between molecule/ionic solute and hydrogen bonds have been demonstrated to occur in the THz region, which are closely related to their physical/

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26

Kersten, Simon, Franck Sgard, and Michael Vorländer. "Impact of the ear canal motion on the impedance boundary conditions in models of the occlusion effect." Journal of the Acoustical Society of America 155, no. 1 (2024): 56–67. http://dx.doi.org/10.1121/10.0024244.

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The occlusion effect (OE) denotes the increased low-frequency perception of bone-conducted sounds when the ear canal (EC) is occluded. Circuit and finite element (FE) models are commonly used to investigate the OE and improve its prediction, often applying acoustic impedances at the EC entrance and tympanic membrane (TM). This study investigates the sound generation caused by the structural motion of the EC. In addition to the EC wall vibration, it accounts for the motions of the EC entrance and TM, resulting from nondeforming motion of the surrounding structures. A model extension including t

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27

Kovalenko, Onorina, Vladislav Golyanik, Jameel Malik, Ahmed Elhayek, and Stricker. "Structure from Articulated Motion: Accurate and Stable Monocular 3D Reconstruction without Training Data." Sensors 19, no. 20 (2019): 4603. http://dx.doi.org/10.3390/s19204603.

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Recovery of articulated 3D structure from 2D observations is a challenging computer vision problem with many applications. Current learning-based approaches achieve state-of-the-art accuracy on public benchmarks but are restricted to specific types of objects and motions covered by the training datasets. Model-based approaches do not rely on training data but show lower accuracy on these datasets. In this paper, we introduce a model-based method called Structure from Articulated Motion (SfAM), which can recover multiple object and motion types without training on extensive data collections. At

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Dais, Photis, and George Fainos. "Motional behavior of "asperlin" in solution. A 13C spin-lattice relaxation study." Canadian Journal of Chemistry 64, no. 3 (1986): 560–65. http://dx.doi.org/10.1139/v86-090.

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l3C nuclear magnetic resonance spin-lattice relaxation times (T1) have been used to probe the motional behavior of 5-acetoxy-5,6-dihydro-6-(1,2-epoxypropyl)-2-pyrone ("asperlin") in dimethyl sulfoxide solution. This molecule offers structural features suited to a study of internal motions, i.e., epoxypropyl and methyl internal motions superimposed on an anisotropic overall reorientation. The rigidity of the pyrone ring and its semiplanar conformation result in an overall ellipsoidal shape, and hence the rotational dynamics of asperlin are adequately approximated by the diffusion of a prolate e

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Neuman, Murray N. "Classical frequency modulation and the Franck–Condon principle." Canadian Journal of Chemistry 67, no. 9 (1989): 1480–83. http://dx.doi.org/10.1139/v89-225.

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A classical frequency-modulation principle is used to calculate the dipole spectrum of a two-freedom oscillator. Its two motions are assumed adiabatically separable; the frequency of motion along the fast coordinate is assumed to have a weak linear dependence on the slow coordinate. At high temperatures, the dipole spectrum of the fast motion, as found by this method, agrees quantitatively with a result based on evaluation of the Franck–Condon factors for the corresponding quantum-mechanical transition. It is suggested that the frequency-modulation approach might be especially useful in studyi

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30

LaScalza, Suzanne, Linda N. Gallo, James E. Carpenter, and Richard E. Hughes. "A Method for Measuring Euler Rotation Angles and Helical Axis of Upper Arm Motion." Journal of Applied Biomechanics 18, no. 4 (2002): 374–83. http://dx.doi.org/10.1123/jab.18.4.374.

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Clinical observation suggests that shoulder pathologies such as rotator cuff disorders and shoulder instability may alter the normal shoulder rhythm or relative motions of the structures comprising the shoulder girdle. The purpose of this study was to assess the accuracy of using a skin-mounted humeral cuff that could be used in vivo to determine Euler rotation angles and the helical axis of motion (HAM) during upper extremity movements. An in vitro model was used to compare the kinematics determined from the externally applied humeral cuff to the kinematics measured directly from the humerus.

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Gong, Liang, Binhao Chen, Wenbin Xu, et al. "Motion Similarity Evaluation between Human and a Tri-Co Robot during Real-Time Imitation with a Trajectory Dynamic Time Warping Model." Sensors 22, no. 5 (2022): 1968. http://dx.doi.org/10.3390/s22051968.

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Precisely imitating human motions in real-time poses a challenge for the robots due to difference in their physical structures. This paper proposes a human–computer interaction method for remotely manipulating life-size humanoid robots with a new metrics for evaluating motion similarity. First, we establish a motion capture system to acquire the operator’s motion data and retarget it to the standard bone model. Secondly, we develop a fast mapping algorithm, by mapping the BVH (BioVision Hierarchy) data collected by the motion capture system to each joint motion angle of the robot to realize th

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Miller, M. A., M. Khorasani, K. L. Townsend, M. J. Allen, and K. A. Mann. "The dog as a preclinical model to evaluate interface morphology and micro-motion in cemented total knee replacement." Veterinary and Comparative Orthopaedics and Traumatology 25, no. 01 (2012): 01–10. http://dx.doi.org/10.3415/vcot-11-01-0014.

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SummaryObjectives: This study investigated cemented fixation of the tibial component from a canine total knee replacement preclinical model. The objective was to determine the local morphology at the material interfaces (implant, cement, bone) and the local relative micro-motion due to functional loading following in vivo service.Methods: Five skeletally mature research dogs underwent unilateral total knee replacement using a cemented implant system with a polyethylene (PE) monobloc tibial component. Use of the implanted limb was assessed by pressure-sensitive walkway analysis. At 60 weeks pos

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Lewis, Gregory S., H. J. Sommer, and Stephen J. Piazza. "In Vitro Assessment of a Motion-Based Optimization Method for Locating the Talocrural and Subtalar Joint Axes." Journal of Biomechanical Engineering 128, no. 4 (2006): 596–603. http://dx.doi.org/10.1115/1.2205866.

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The locations of the joint axes of the ankle complex vary considerably between subjects, yet no noninvasive method with demonstrated accuracy exists for locating these axes. The moments of muscle and ground reaction forces about the joint axes are dependent on axis locations, making knowledge of these locations critical to accurate musculoskeletal modeling of the foot and ankle. The accuracy of a computational optimization method that fits a two-revolute model to measured motion was assessed using computer-generated data, a two-revolute mechanical linkage, and three lower-leg cadaver specimens

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Wilkinson, S., B. Merín, and P. Riviere-Marichalar. "New member candidates of Upper Scorpius from Gaia DR1." Astronomy & Astrophysics 618 (October 2018): A12. http://dx.doi.org/10.1051/0004-6361/201731138.

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Context. Selecting a cluster in proper motion space is an established method for identifying members of a star-forming region. The first data release from Gaia (DR1) provides an extremely large and precise stellar catalogue, which when combined with the Tycho-2 catalogue gives the 2.5 million parallaxes and proper motions contained within the Tycho-Gaia Astrometric Solution (TGAS). Aims. We aim to identify new member candidates of the nearby Upper Scorpius subgroup of the Scorpius-Centaurus Complex within the TGAS catalogue. In doing so, we also aim to validate the use of a density-based clust

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Samanta, B. "Dynamics of Flexible Multibody Systems Using Bond Graphs and Lagrange Multipliers." Journal of Mechanical Design 112, no. 1 (1990): 30–35. http://dx.doi.org/10.1115/1.2912575.

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A procedure is presented to study the dynamics of interconnected flexible systems using bond graphs. The concept of Lagrange multipliers, which are commonly used in analysis of constrained systems, is introduced in the procedure. The overall motions of each of the component bodies are described in terms of large rigid body motions and small elastic vibrations. Bond graphs are used to represent both rigid body and flexible dynamics of each body in a unified manner. Bond graphs of such sub-systems are coupled to one another satisfying the kinematic constraints at the interfaces to get the overal

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Bubenchikov, Alexey, Mikhail Bubenchikov, and Dmitriy Mamontov. "The Dynamic State of a Pseudo-Crystalline Structure of B42 Molecules." Crystals 10, no. 6 (2020): 510. http://dx.doi.org/10.3390/cryst10060510.

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In this paper, we have developed a mathematical model of the dynamics of molecular structures arising from an approach using B42 molecules. The model is based on equations that determine the motion of the centers of mass of the molecules in question, and equations for the projections of the moments of quantities of motion of these particles on the axes associated with them. The thermal motions of boron atoms within each individual molecule are calculated using a bond-ordered potential. The intermolecular interactions of atoms have a potential that appears to coincide with that of free atoms. H

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Huang, H., R. W. Nightingale, and A. B. C. Dang. "Biomechanics of coupled motion in the cervical spine during simulated whiplash in patients with pre-existing cervical or lumbar spinal fusion." Bone & Joint Research 7, no. 1 (2018): 28–35. http://dx.doi.org/10.1302/2046-3758.71.bjr-2017-0100.r1.

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Objectives Loss of motion following spine segment fusion results in increased strain in the adjacent motion segments. However, to date, studies on the biomechanics of the cervical spine have not assessed the role of coupled motions in the lumbar spine. Accordingly, we investigated the biomechanics of the cervical spine following cervical fusion and lumbar fusion during simulated whiplash using a whole-human finite element (FE) model to simulate coupled motions of the spine. Methods A previously validated FE model of the human body in the driver-occupant position was used to investigate cervica

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Yan, Xianyou. "Improved Deep Learning Method for Intelligent Analysis of Sports Training Posture." Advances in Multimedia 2022 (August 9, 2022): 1–9. http://dx.doi.org/10.1155/2022/4667640.

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Motion recognition based on human bones has attracted extensive attention in recent years because of its simplicity and robustness. Considering the causality of human movement, this paper proposes an improved deep learning method for posture analysis in sports training. In order to deal with the complex situation of calculating joint torques as weights, the edge weights and convolution weights of bone maps are used as auxiliary information networks according to the causality of joint distribution. Thus, the stronger driving force of joint weights in the neural network is improved, the low impo

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Ludewig, Paula M., Thomas M. Cook, and Richard K. Shields. "Comparison of Surface Sensor and Bone-Fixed Measurement of Humeral Motion." Journal of Applied Biomechanics 18, no. 2 (2002): 163–70. http://dx.doi.org/10.1123/jab.18.2.163.

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A common method of tracking humeral motion involves securing a thermoplastic cuff to the humerus with an electromagnetic sensor attached. The data on the accuracy of this technique are limited. This study addressed two questions: (a) How similar are surface and bone-fixed measurements of 3-D humeral rotations? (b) How similar are surface and bone-fixed measurements of 3-D humeral translations? Electromagnetic motion sensors were secured to a bone-fixed external humeral fixator, a surface humeral cuff, and the skin over the sternum and scapular acromion process. The 3-D data were collected duri

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Vossel, Manuel, Meiko Müller, Annegret Niesche, Lukas Theisgen, Klaus Radermacher, and Matías de la Fuente. "MINARO HD: control and evaluation of a handheld, highly dynamic surgical robot." International Journal of Computer Assisted Radiology and Surgery 16, no. 3 (2021): 467–74. http://dx.doi.org/10.1007/s11548-020-02306-9.

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Abstract Purpose Current surgical robotic systems are either large serial arms, resulting in higher risks due to their high inertia and no inherent limitations of the working space, or they are bone-mounted, adding substantial additional task steps to the surgical workflow. The robot presented in this paper has a handy and lightweight design and can be easily held by the surgeon. No rigid fixation to the bone or a cart is necessary. A high-speed tracking camera together with a fast control system ensures the accurate positioning of a burring tool. Methods The capabilities of the robotic system

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Raji, Oluwatodimu Richard, Jason E. Pope, Steven M. Falowski, Michael Stoffman, and Jeremi M. Leasure. "Fixation of the Sacroiliac Joint: A Cadaver-Based Concurrent-Controlled Biomechanical Comparison of Posterior Interposition and Posterolateral Transosseous Techniques." Neurospine 22, no. 1 (2025): 185–93. https://doi.org/10.14245/ns.2448940.470.

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Objective: Our study aimed to compare the posterior interposition technique against the posterolateral transosseous technique in the same cadaver specimens.Methods: Computer and cadaver models of 2 fixation techniques were developed. The computer model was constructed to analyze bone volume removed during implant placement and the bony surface area available for fusion. The cadaver model included quasi-static multidirectional bending flexibility and dynamic fatigue loading. Relative motions between the sacrum and ilium were measured intact, after joint destabilization, after fixation with dire

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Yen, Chiaming, and Glenn Y. Masada. "Dynamic Analysis of Flexible Bodies Using Extended Bond Graphs." Journal of Dynamic Systems, Measurement, and Control 116, no. 1 (1994): 66–72. http://dx.doi.org/10.1115/1.2900682.

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An Extended Bond Graph (EBG) formulation is described for analyzing the dynamics of a flexible multibody system. This work extends the EBG method, which was originally developed for systems with small spatial motion, to rigid and flexible multibody systems exhibiting large overall motions. The development uses modular models for the elements so that complex system models can be derived by coupling these modules. The EBG formulation for moving reference frames is used to derive models of one-link and two-link flexible manipulator systems. This approach has several advantages over the Lagrangian

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Jain, Prakhar, Tarun Kumar Bera, Sajid Rafique, Ashish Singla, and Magnus Isaksson. "Comparative study of knee joint torque estimations for linear and rotary actuators using bond graph approach for stand–sit–stand motions." International Journal of Advanced Robotic Systems 17, no. 5 (2020): 172988142096374. http://dx.doi.org/10.1177/1729881420963742.

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Stand–sit–stand (STS) motions are the most frequently performed activities of everyday life and require extensive movement of knee joint. People suffering from knee joint disorders face difficulties in performing this motion. The compact knee exoskeleton (KE) has proven to be a viable, less complex, and cheaper alternative to the available entire lower-, upper-, and full-body exoskeletons. With growing number of technical glitches and finite battery life problems, there exist risks of sudden failure of the actuator of KE that could be detrimental for the vulnerable users. To overcome this prob

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Yücel, Engin. "In vivo dynamic analysis of bone-implant interface in cervical disc implants." Journal of Translational and Practical Medicine 2, no. 2 (2023): 85–88. http://dx.doi.org/10.51271/jtpm-0047.

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Aims: Our aim was to learn whether there is a micro motion at the bone-implant interface of the UFO cervical disc prosthesis. Methods: Sagittal range of motion of the functional spinal unit, defined as the angle formed by lines drawn at the superior margin of the upper vertebral body and the inferior margin of the lower body were determined preoperatively and postoperatively. Besides, the possible micro motion at the bone-implant interface was evaluated. Results: We report this dynamic computerized tomography evaluation method as an enabler to determine if there is micro motion at the bone imp

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Beckmann, Nicholas A., Rudi G. Bitsch, Mareike Schonhoff, Klaus-Arno Siebenrock, Martin Schwarze, and Sebastian Jaeger. "Comparison of the Primary Stability of Porous Tantalum and Titanium Acetabular Revision Constructs." Materials 13, no. 7 (2020): 1783. http://dx.doi.org/10.3390/ma13071783.

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Adequate primary stability of the acetabular revision construct is necessary for long-term implant survival. The difference in primary stability between tantalum and titanium components is unclear. Six composite hemipelvises with an acetabular defect were implanted with a tantalum augment and cup, using cement fixation between cup and augment. Relative motion was measured at cup/bone, cup/augment and bone/augment interfaces at three load levels; the results were compared to the relative motion measured at the same interfaces of a titanium cup/augment construct of identical dimensions, also imp

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Dogru, Suzan Cansel, and Yunus Ziya Arslan. "Effect of Model Parameters on the Biomechanical Behavior of the Finite Element Cervical Spine Model." Applied Bionics and Biomechanics 2021 (June 27, 2021): 1–9. http://dx.doi.org/10.1155/2021/5593037.

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Finite element (FE) models have frequently been used to analyze spine biomechanics. Material parameters assigned to FE spine models are generally uncertain, and their effect on the characterization of the spinal components is not clear. In this study, we aimed to analyze the effect of model parameters on the range of motion, stress, and strain responses of a FE cervical spine model. To do so, we created a computed tomography-based FE model that consisted of C2-C3 vertebrae, intervertebral disc, facet joints, and ligaments. A total of 32 FE analyses were carried out for two different elastic mo

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Osada, Denju, Shuzo Kamei, Morimitsu Takai, Kazuo Tomizawa, and Kazuya Tamai. "MALUNITED FRACTURES OF THE DISTAL RADIUS TREATED WITH CORRECTIVE OSTEOTOMY USING VOLAR LOCKING PLATE AND A CORTICOCANCELLOUS BONE GRAFT FOLLOWING IMMEDIATE MOBILISATION." Hand Surgery 12, no. 03 (2007): 183–90. http://dx.doi.org/10.1142/s0218810407003560.

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We describe our experience of using a volar locking plate for corrective osteotomy and bone grafting combined with early mobilisation in the treatment of distal radius malunions. Corrective osteotomy of the distal radius was performed through a volar approach, and fixated by a volar locking plate associated with corticocancellous iliac bone grafting in three patients aged 16, 71 and 75 years. Two patients had had volarly displaced malunion and one dorsally displaced malunion. Wrist motin was started immediately after surgery. The average follow-up was 15 months (range, 12–20 months). All osteo

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Kotani, Yoshihisa, Bryan W. Cunningham, Kuniyoshi Abumi, et al. "Multidirectional flexibility analysis of cervical artificial disc reconstruction: in vitro human cadaveric spine model." Journal of Neurosurgery: Spine 2, no. 2 (2005): 188–94. http://dx.doi.org/10.3171/spi.2005.2.2.0188.

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Object. This in vitro experimental study was conducted to investigate the initial biomechanical effect of artificial intervertebral disc replacement in the cervical spine. The multidirectional flexibility of replaced and adjacent spinal segments were analyzed using a cadaveric cervical spine model. Methods. The following three cervical reconstructions were sequentially performed at the C5–6 level after anterior discectomy in seven human cadaveric occipitocervical spines: anterior artificial disc replacement with a bioactive three-dimensional (3D) fabric disc (FD); anterior iliac bone graft; an

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Sella, Ariel, Harold Basch, and Shmaryahu Hoz. "Concerted motion in bicyclobutane." Canadian Journal of Chemistry 76, no. 6 (1998): 832–35. http://dx.doi.org/10.1139/v98-057.

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In bicyclobutane, the bridgehead substituents move inward as the bridge bond lengthens, and vice versa. The effect of BH2, H, F, and OH as bridgehead substituents was investigated using quantum-mechanical calculations. The degree of invertedness of the bridgehead carbon was found to depend on the electronegativity of the substituent. It becomes more pronounced with electropositive substituents which, at the same time, also cause lengthening of the central bond (1.43 Å for F to 1.55 Å for BH2). The oscillation phenomenon was found to be common to all the substituents regardless of their electro

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Wagoner, Amanda, Matthew Allen, Claudia Zindl, Alan Litsky, Robert Orsher, and Ron Ben-Amotz. "Evaluating Stiffness of Fibreglass and Thermoplastic Splint Materials and Inter-fragmentary Motion in a Canine Tibial Fracture Model." Veterinary and Comparative Orthopaedics and Traumatology 31, no. 03 (2018): 176–81. http://dx.doi.org/10.1055/s-0038-1637744.

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Objectives Various materials are used to construct splints for mid-diaphyseal tibial fracture stabilization. The objective of this study was to compare construct stiffness and inter-fragmentary bone motion when fibreglass (FG) or thermoplastic (TP) splints are applied to either the lateral or cranial aspect of the tibia in a mid-diaphyseal fracture model. Methods A coaptation bandage was applied to eight cadaveric canine pelvic limbs, with a custom-formed splint made of either FG or TP material applied to either the lateral or cranial aspect of the osteotomized tibia. Four-point bending tests

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