The reactive collision mechanism evinced: stereodynamical control of the elementary Br + H2 → H + HBr reaction

2013 ◽  
Vol 15 (32) ◽  
pp. 13513 ◽  
Author(s):  
D. Herráez-Aguilar ◽  
P. G. Jambrina ◽  
J. Aldegunde ◽  
Vicente Sáez-Rábanos ◽  
M. P. de Miranda ◽  
...  
Keyword(s):  
Reactive Collision ◽  
Collision Mechanism

Optimal path planning of a disinfection mobile robot against COVID-19 in a ROS-based research platform

2021 ◽  
Vol 16 (4) ◽  
pp. 405-417
Author(s):  
L. Banjanovic-Mehmedovic ◽  
I. Karabegovic ◽  
J. Jahic ◽  
M. Omercic
Keyword(s):  
Path Planning ◽  
Optimal Path ◽  
Pso Algorithm ◽  
Optimal Path Planning ◽  
Localization And Mapping ◽  
Increasing Demand ◽  
Window Approach ◽  
Path Planner ◽  
Hardware Platforms ◽  
Reactive Collision

Due to COVID-19 pandemic, there is an increasing demand for mobile robots to substitute human in disinfection tasks. New generations of disinfection robots could be developed to navigate in high-risk, high-touch areas. Public spaces, such as airports, schools, malls, hospitals, workplaces and factories could benefit from robotic disinfection in terms of task accuracy, cost, and execution time. The aim of this work is to integrate and analyse the performance of Particle Swarm Optimization (PSO) algorithm, as global path planner, coupled with Dynamic Window Approach (DWA) for reactive collision avoidance using a ROS-based software prototyping tool. This paper introduces our solution – a SLAM (Simultaneous Localization and Mapping) and optimal path planning-based approach for performing autonomous indoor disinfection work. This ROS-based solution could be easily transferred to different hardware platforms to substitute human to conduct disinfection work in different real contaminated environments.

scholarly journals The role of a mid-air collision in drifting snow

2018 ◽  
Author(s):  
Shuming Jia ◽  
Zhengshi Wang ◽  
Shumin Li
Keyword(s):  
Friction Velocity ◽  
Global Climate ◽  
Three Dimensional ◽  
Particle Collision ◽  
High Concentration ◽  
Three Dimensional Model ◽  
Two Phase ◽  
Drifting Snow ◽  
Collision Mechanism

Abstract. Drifting snow, a common two-phase flow movement in high and cold areas, contributes greatly to the mass and energy balance of glacier and ice sheets and further affects the global climate system. Mid-air collisions occur frequently in high-concentration snow flows; however, this mechanism is rarely considered in current models of drifting snow. In this work, a three-dimensional model of drifting snow with consideration of inter-particle collisions is established; this model enables the investigation of the role of a mid-air collision mechanism in openly drifting snow. It is found that the particle collision frequency increases with the particle concentration and friction velocity, and the blown snow with a mid-air collision effect produces more realistic transport fluxes since inter-particle collision can enhance the particle activity under the same condition. However, the snow saltation mass flux basically shows a cubic dependency with friction velocity, which distinguishes it from the quadratic dependence of blown sand movement. Moreover, the snow saltation flux is found to be largely sensitive to the particle size distribution since the suspension snow may restrain the saltation movement. This research could improve our understanding of the role of the mid-air collision mechanism in natural drifting snow.

Mass spectrometric studies of chemical reactions in shock waves: the thermal decomposition of nitrous oxide

1969 ◽  
Vol 47 (4) ◽  
pp. 521-538 ◽  
Author(s):  
S. C. Barton ◽  
J. E. Dove
Keyword(s):  
Thermal Decomposition ◽  
Shock Waves ◽  
Rate Coefficient ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Unimolecular Decomposition ◽  
Reflected Shock ◽  
Secondary Reactions ◽  
Gas Reactions ◽  
Collision Mechanism

Apparatus for the mass spectrometric study of rapid gas reactions in reflected shock waves is described. This apparatus has been applied to the thermal decomposition of 2% N2O in Kr at total gas concentrations of about 1.6 × 10−6 mole cm−3, in the temperature range 1800 to 2800 °K. The principal products of the reaction were found to be N2, O2, NO, and O. The rate coefficient for the unimolecular decomposition of N2O was calculated from the experimental data, and the rates of the secondary reactions between O and N2O were estimated. The possibility of the occurrence of a "weak collision" mechanism in the unimolecular reaction of N2O is discussed.

scholarly journals The Formation of Disks by Inelastic Collisions of Gravitating Particles. Applications to the Dynamics of the Saturn's Ring and to the Formation of the Solar System

1974 ◽  
Vol 62 ◽  
pp. 83-93
Author(s):  
A. Brahic
Keyword(s):  
Solar System ◽  
Three Dimensional ◽  
Inelastic Collisions ◽  
Dimensional System ◽  
Central Mass ◽  
System Of Particles ◽  
Final Equilibrium State ◽  
First Results ◽  
Three Dimensional System ◽  
Collision Mechanism

We integrate numerically the evolution of a three-dimensional system of particles with finite dimensions, which bounce inelastically upon each other. The particles are subjected to the attraction of a central mass; their mutual attraction is neglected. This model is used to study the evolution of Saturn's ring. The first results are presented: such a collision mechanism can flatten very quickly the Saturn's ring and the system tends towards a final equilibrium state.

Quantum stereodynamics of the Li+HF(v,j) reactive collision for different initial states of the reagent

1998 ◽  
Vol 109 (21) ◽  
pp. 9391-9400 ◽  
Author(s):  
Manuel Lara ◽  
Alfredo Aguado ◽  
Octavio Roncero ◽  
Miguel Paniagua
Keyword(s):  
Initial States ◽  
Reactive Collision
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