17,597 Hits in 5.6 sec

Dynamical quantum processes of molecular beams at surfaces: dissociative adsorption of hydrogen on metal surfaces

Axel Gross
1996 Surface Science  
Due to the improvement of computer power and the development of efficient algorithms it is now possible to combine high-dimensional quantum dynamical calculations of the dissociative adsorption of molecular  ...  system H_2/Pd(100) it is shown that the initial decrease of the sticking probability with increasing kinetic energy, which is usually attributed to a precursor mechanism, can be explained by dynamical steering  ...  ., which offered a great opportunity for exchanging ideas on high-dimensional quantum dynamics. 18  ... 
doi:10.1016/0039-6028(96)00070-2 fatcat:qc22ijyiwfap3ncegodzgtisia

A novel method for prediction of mobile robot maneuvering spaces

Patrick N. Currier, Alfred L. Wicks
2013 Journal of terramechanics  
A novel method is proposed to address this need by using force-moment diagrams to characterize the robot's maneuvering space in terms of path curvature and curvature rate.  ...  As the operational uses of mobile robots continue to expand, it becomes useful to be able to predict the admissible maneuvering space to prevent the robot from executing unsafe maneuvers.  ...  For most vehicles, the dynamic index is approximately equal to unity, with slightly lower values found on high performance vehicles [17] .  ... 
doi:10.1016/j.jterra.2013.03.001 fatcat:o7rvqcbkifgerp2wigmfdkatce

Steering and ro-vibrational effects in the dissociative adsorption and associative desorption of H_2/Pd(100) [article]

Axel Gross, Matthias Scheffler
1997 arXiv   pre-print
By performing six-dimensional quantum dynamical calculations using a potential energy surface derived from ab initio calculations for the system H_2/Pd(100) we show that these features of the potential  ...  energy surface lead to strong steering effects in the dissociative adsorption and associative desorption dynamics.  ...  Our results establish the importance of a high-dimensional dynamical treatment in order to understand reactions at surfaces.  ... 
arXiv:cond-mat/9702037v1 fatcat:v5l5oxas5nfafnigi37sefkdai

Nonlinear beam dynamics in a funnel for combining two intense ion beams

J. H. Whealton, R. J. Raridon, K. E. Rothe, W. R. Becraft, T. L. Owens
1988 AIP Conference Proceedings  
Enormous aberrations, basically from nonlinear space charge forces between points A and B, can be seen on the longitudinal emittance diagram on the lower right hand side.  ...  The longitudinal emittance is very high and very different from that presented in Fig. 24 . Here the beam is essentially crossing over from a rebunch case to a debunched case.  ... 
doi:10.1063/1.37797 fatcat:kkduzttcwfdhvghevp2rfdgjwi

Thermal Simulation Analysis of Internal Control Circuit Board of Steering Gear Box Based on COMSOL Three-Dimensional Simulation Software

Wen Huo, Akshi Kumar
2022 Computational Intelligence and Neuroscience  
circuit in a confined space.  ...  Based on this, this paper uses COMSOL three-dimensional simulation software to conduct thermal simulation analysis on the shell of the steering gear containing the control circuit board.  ...  the internal ball screw heating source on the control circuit, and analyzes and calculates that the heat source of the ball screw is relatively high. e impact on the control circuit is small. (1) In order  ... 
doi:10.1155/2022/3006349 pmid:35371216 pmcid:PMC8970913 fatcat:24eun5g5tvf6jhqzgtyxv3vcai

An Extension of MUSIC Exploiting Higher-Order Moments via Nonlinear Mapping

Yuya SUGIMOTO, Shigeki MIYABE, Takeshi YAMADA, Shoji MAKINO, Biing-Hwang JUANG
2016 IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences  
Furthermore, we describe the class of mapping that allows us to analyze the higher-order moments of the observed signal in the original space.  ...  We propose an estimation algorithm that nonlinearly maps the observed signal onto a space with expanded dimensionality and conducts MUSIC-based correlation analysis in the expanded space.  ...  We also discussed the properties of the mapping function with degree d used to analyze the 2dth-order cross-moments and presented efficient algorithms with which the 4th-and 6th-order moments can be calculated  ... 
doi:10.1587/transfun.e99.a.1152 fatcat:24eauhqvrvhkpgqpmupqntwpay

Certification of high-dimensional entanglement and Einstein-Podolsky-Rosen steering with cold atomic quantum memory

Michał Dąbrowski, Mateusz Mazelanik, Michał Parniak, Adam Leszczyński, Michał Lipka, Wojciech Wasilewski
2018 Physical Review A  
The advent of structured, high-dimensional entangled states brings new possibilities for quantum imaging, information processing and quantum key distribution.  ...  We experimentally generate and characterize a spatially entangled state stored in a quantum memory system, using entropic EPR-steering inequality, yielding genuine violation of 1.06±0.15 bits and certifying  ...  Of particular interest is the broad concept of high-dimensional (HD) entangled states, for which the dimension of Hilbert space required to describe the observed correlations reaches thousands [3] .  ... 
doi:10.1103/physreva.98.042126 fatcat:ch6rngyzfbeunpvc3ty5nskhoe

Neural Network Identification of a Racing Car Tire Model

Jianfeng Wang, Yiqun Liu, Liang Ding, Jun Li, Haibo Gao, Yuhan Liang, Tianyao Sun
2018 Journal of Engineering  
A high-precision tire model used for vehicle dynamics simulation is established via this method.  ...  In order to fully understand the difference between the two models, a two-degrees-of-freedom (2 DOF) vehicle model is established.  ...  In order to clarify the relationship between the tire characteristic parameters and the six-dimensional tire force, a right-handed system is necessary.  ... 
doi:10.1155/2018/4143794 fatcat:eeooyyhdxjadjphaeet3yhaxbm

Integral Modeling for Deviation Correction Trajectory of the Mechanical Vertical Drilling System

Lin Chai, Kai Zhang, Dengwen Yang, Baolin Liu, Delong Zhang
2021 Machines  
The existence of critical deflection angle makes MVDS correct deviation and change azimuth at the same time, resulting in the trajectory being a three-dimensional curve, which has the tendency of drifting  ...  At this moment, the high-pressure drilling fluid will flow in the connected channel and impel the corresponding steering rib of the actuator to push against the upper side of the wellbore, so as to make  ...  At this moment, the high-pressure drilling fluid will flow in the connected channel and impel the corresponding steering rib of the actuator to push against the upper side of the wellbore, so as to make  ... 
doi:10.3390/machines9080161 fatcat:deawyini6zcqheg34nkyetpzmm


Matthew Spenko, Steven Dubowsky, Karl Iagnemma
2006 IFAC Proceedings Volumes  
This paper presents a novel method for high speed navigation and hazard avoidance based on the two dimensional "trajectory space," a compact and computationally efficient modelbased representation of a  ...  In these scenarios there is often limited time to replan a path based on high-order dynamic models.  ...  Constraints for side slip and steering effects can be derived from similarly low-order models. Details are presented in Spenko, 2005 .  ... 
doi:10.3182/20060906-3-it-2910.00101 fatcat:intqku62tvfqrpf24tv2zudjbi

Steering Moments Creation in Supersonic Flow by Off-Axis Plasma Heat Addition

I G. Girgis, M N. Shneider, S O. Macheret, G L. Brown, R B. Miles
2006 Journal of Spacecraft and Rockets  
using a second-order, cell-vertex, finite volume scheme in space.  ...  It is clear that a considerable gain in steering moment can be achieved at high Mach numbers.  ... 
doi:10.2514/1.16708 fatcat:o7ujsfx44vhz3homoceyeydw7e


Vladica Živković, Dragan Adamović, Bogdan Nedić
2021 Mobility and Vehicle Mechanics  
After the definition of property requirements that potential materials must meet, digital-logic method has been applied in order to calculate the weighting factors of said properties.  ...  The paper gives a description of the material selection process for a steering knuckle of a passenger vehicle's independent suspension system, by using two quantitative methods of material selection: Weighted  ...  wheel steering and turning lead to torsion moment occurrence.  ... 
doi:10.24874/mvm.2021.47.04.01 fatcat:k5yw3lah45be3gxxunz37aqzcm

Consideration of generated beam angles increases the accuracy of ultrasonic displacement measurements

Chikayoshi Sumi, Chikayoshi Sumi
2012 Reports in Medical Imaging  
For instance, for a two-dimensional (2D) Cartesian coordinate system, this is obtained by calculating the arctangent of the ratio of the axial and lateral instantaneous frequencies or the first moments  ...  However, the measurement accuracies of one-directional displacements are significantly lower than those of displacement vectors, because of the practical three-dimensional deformation or motion (eg, about  ...  From the measured displacement vector, the displacement d(x, y) or d(x, y, z) in the beam direction can be calculated with a high degree of accuracy.  ... 
doi:10.2147/rmi.s27307 fatcat:y2mv5j2bsjaqzkq5yadfxhkgdi

Kinect-Based Motion Recognition Tracking Robotic Arm Platform

Jinxiao Gao, Yinan Chen, Fuhao Li
2019 Intelligent Control and Automation  
The system transmits the signal to the lower computer platform with Arduino as the core through the transmission mode of the serial communication, thereby completing the control of the steering gear.  ...  In order to verify the feasibility of the theory, the team built a 4-DOF robotic arm control system and completed software development.  ...  of the space vector and the relative position between different bones to calculate the inter-bones.  ... 
doi:10.4236/ica.2019.103005 fatcat:7blog5mwhfhqllld7gdn627qv4

Interactive Computation, Parameter Continuation, and Visualization

John H. Maddocks, Robert S. Manning, Randy C. Paffenroth, Kathleen A. Rogers, Jeremy A. Warner
1997 International Journal of Bifurcation and Chaos in Applied Sciences and Engineering  
Visualization provides both understanding of the solution set and feedback for computational steering.  ...  Since the bifurcation diagram exists in a high dimensional space, it is necessary to project in order to exploit visualization.  ...  We remark that even with only two parameters and moderately sized problems, computational steering is desirable in order to concentrate on interesting regions of parameter space.  ... 
doi:10.1142/s0218127497001333 fatcat:u5275fenmjedhlwsrf6v7mipnm
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