scholarly journals Free energies of crystals computed using Einstein crystal with fixed center of mass and differing spring constants

2021 ◽  
Vol 154 (16) ◽  
pp. 164509
Author(s):  
Vikram Khanna ◽  
Jamshed Anwar ◽  
Daan Frenkel ◽  
Michael F. Doherty ◽  
Baron Peters
Keyword(s):  
Center Of Mass ◽  
Free Energies ◽  
Spring Constants ◽  
Fixed Center

Dido's Problem with a Fixed Center of Mass

1995 ◽  
Vol 28 (14) ◽  
pp. 317-322
Author(s):  
A. Krener ◽  
S. Nikitin
Keyword(s):  
Center Of Mass ◽  
Fixed Center

scholarly journals THEOREM OF CHANGE IN THE ANGULAR MOMENTUM OF A SYSTEM WITH RESPECT TO A MOVING CENTER

1987 ◽  
Vol 9 (1) ◽  
pp. 26-32
Author(s):  
Nguyen Dang To
Keyword(s):  
Differential Equation ◽  
Angular Momentum ◽  
Rigid Body ◽  
Center Of Mass ◽  
Plane Motion ◽  
Absolute Motion ◽  
Special Cases ◽  
Fixed Center

The Literatures of theorical mechanics only present, the theorem of change in the angular momentum of a system with respect to a fixed center; with respect to the center of mass ... In this paper we developed that theorem With respect to any moving center in relative and absolute motion of system. Having applied this theorem in many special cases of plane motion of a rigid body; we can write directly the differential equation without reactions that describes the rotation of that body so as its integration will be more convenient.

scholarly journals The form factor and the density distribution of the 4He nucleus using the Morse potential

2020 ◽  
Vol 5 ◽  
pp. 171
Author(s):  
K. Ypsilantis ◽  
S. Dimitrova ◽  
C. G. Koutroulos ◽  
M. E. Grypeos ◽  
A. Antonov
Keyword(s):  
Form Factor ◽  
Density Distribution ◽  
Electron Scattering ◽  
Center Of Mass ◽  
Mass Motion ◽  
Elastic Electron Scattering ◽  
Oscillator Shell ◽  
Particle Potential ◽  
Single Particle Potential ◽  
Fixed Center

The form factor and the density distribution of the He nucleus are calculated approximately using the Morse single-particle potential. The parameters are determined by fitting the theoretical charge form factor to the corresponding experimental data of the elastic electron scattering by 4He, which are extended to large values of the momentum transfer. The corrections due to the center of mass motion (in the fixed center of mass approach) and of the finite proton size have been taken into account. The calculations can be performed partly analytically and the results show a considerable im- provement with respect to those obtained with the oscillator shell model.

The Center of Mass Influences Normal Attentional Orienting

1994 ◽  
Author(s):  
Marcia Grabowecky ◽  
Lynn C. Robertson ◽  
Anne Treisman
Keyword(s):  
Center Of Mass ◽  
Attentional Orienting

Center of Mass Theorem and the Separation of Variables for Two-Body System on a Three-Dimensional Sphere

2020 ◽  
Vol 23 (3) ◽  
pp. 306-311
Author(s):  
Yu. Kurochkin ◽  
Dz. Shoukavy ◽  
I. Boyarina
Keyword(s):  
Constant Curvature ◽  
Jacobi Equation ◽  
Separation Of Variables ◽  
Center Of Mass ◽  
Three Dimensional ◽  
Relative Distance ◽  
Dimensional Sphere ◽  
Body System ◽  
Spaces Of Constant Curvature ◽  
Hamilton Jacobi Equation

The immobility of the center of mass in spaces of constant curvature is postulated based on its definition obtained in [1]. The system of two particles which interact through a potential depending only on the distance between particles on a three-dimensional sphere is considered. The Hamilton-Jacobi equation is formulated and its solutions and trajectory equations are found. It was established that the reduced mass of the system depends on the relative distance.

TO THE STABILITY OF TANK VEHICLES IN THE BRAKE MODE

2019 ◽  
pp. 27-32
Author(s):  
Denys Popelysh ◽  
Yurii Seluk ◽  
Sergyi Tomchuk
Keyword(s):  
Mathematical Model ◽  
Control Systems ◽  
Distribution Systems ◽  
Traffic Accidents ◽  
Road Traffic ◽  
Center Of Mass ◽  
Dynamic Processes ◽  
Course Stability ◽  
The Stability ◽  
Tank Vehicles

This article discusses the question of the possibility of improving the roll stability of partially filled tank vehicles while braking. We consider the dangers associated with partially filled tank vehicles. We give examples of the severe consequences of road traffic accidents that have occurred with tank vehicles carrying dangerous goods. We conducted an analysis of the dynamic processes of fluid flow in the tank and their influence on the basic parameters of the stability of vehicle. When transporting a partially filled tank due to the comparability of the mass of the empty tank with the mass of the fluid being transported, the dynamic qualities of the vehicle change so that they differ significantly from the dynamic characteristics of other vehicles. Due to large displacements of the center of mass of cargo in the tank there are additional loads that act vehicle and significantly reduce the course stability and the drivability. We consider the dynamics of liquid sloshing in moving containers, and give examples of building a mechanical model of an oscillating fluid in a tank and a mathematical model of a vehicle with a tank. We also considered the method of improving the vehicle’s stability, which is based on the prediction of the moment of action and the nature of the dynamic processes of liquid cargo and the implementation of preventive actions by executive mechanisms. Modern automated control systems (anti-lock brake system, anti-slip control systems, stabilization systems, braking forces distribution systems, floor level systems, etc.) use a certain list of elements for collecting necessary parameters and actuators for their work. This gives the ability to influence the course stability properties without interfering with the design of the vehicle only by making changes to the software of these systems. Keywords: tank vehicle, roll stability, mathematical model, vehicle control systems.

Exploring Baryon Rich Matter with Heavy-Ion Collisions

2019 ◽  
Vol 64 (7) ◽  
pp. 583 ◽  
Author(s):  
S. Harabasz
Keyword(s):  
Center Of Mass ◽  
Heavy Ion ◽  
State Density ◽  
Heavy Nuclei ◽  
First Order ◽  
Center Of Mass Energy ◽  
Ion Collisions ◽  
Deconfinement Phase Transition ◽  
Ground State Density

Collisions of heavy nuclei at (ultra-)relativistic energies provide a fascinating opportunity to re-create various forms of matter in the laboratory. For a short extent of time (10-22 s), matter under extreme conditions of temperature and density can exist. In dedicated experiments, one explores the microscopic structure of strongly interacting matter and its phase diagram. In heavy-ion reactions at SIS18 collision energies, matter is substantially compressed (2–3 times ground-state density), while moderate temperatures are reached (T < 70 MeV). The conditions closely resemble those that prevail, e.g., in neutron star mergers. Matter under such conditions is currently being studied at the High Acceptance DiElecton Spectrometer (HADES). Important topics of the research program are the mechanisms of strangeness production, the emissivity of matter, and the role of baryonic resonances herein. In this contribution, we will focus on the important experimental results obtained by HADES in Au+Au collisions at 2.4 GeV center-of-mass energy. We will also present perspectives for future experiments with HADES and CBM at SIS100, where higher beam energies and intensities will allow for the studies of the first-order deconfinement phase transition and its critical endpoint.

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