scholarly journals The role of the Heisenberg principle in constrained molecular dynamics model

2019 ◽  
Vol 28 (06) ◽  
pp. 1950039
Author(s):  
K. Wang ◽  
A. Bonasera ◽  
H. Zheng ◽  
G. Q. Zhang ◽  
Y. G. Ma ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Pauli Principle ◽  
Binding Energies ◽  
Light Nuclei ◽  
Scattering Data ◽  
Collision Term ◽  
Dynamics Model ◽  
Heisenberg Principle ◽  
The One

We implement the Heisenberg principle into the Constrained Molecular Dynamics model with a similar approach to the Pauli principle using the one-body occupation probability [Formula: see text]. Results of the modified and the original model with comparisons to data are given. The binding energies and the radii of light nuclei obtained with the modified model are more consistent with the experimental data than the original one. The collision term and the density distribution are tested through a comparison to p+[Formula: see text]C elastic scattering data. Some simulations for fragmentation and superheavy nuclei production are also discussed.

scholarly journals SEARCH FOR POSSIBLE WAY OF PRODUCING SUPER-HEAVY ELEMENTS: DYNAMIC STUDY ON DAMPED REACTIONS OF 244Pu+244Pu, 238U+238U and 197Au+197Au

2005 ◽  
Vol 20 (34) ◽  
pp. 2619-2627 ◽  
Author(s):  
NING WANG ◽  
ZHUXIA LI ◽  
XIZHEN WU ◽  
ENGUANG ZHAO
Keyword(s):  
Molecular Dynamics ◽  
Time Scale ◽  
Incident Energy ◽  
Composite System ◽  
Binding Energies ◽  
Decay Process ◽  
Heavy Elements ◽  
Quantum Molecular Dynamics ◽  
Dynamics Model ◽  
Production Probability

By using the Improved Quantum Molecular Dynamics model, the 244 Pu +244 Pu , 238 U +238 U and 197 Au +197 Au reactions at the energy range of E c.m. =800 MeV to 2000 MeV are studied. We find that the production probability of superheavy fragments (SHFs) with Z≥114 for the 244 Pu +244 Pu reaction is much higher compared with that for the 238 U +238 U reaction and no product of SHF is found for the 197 Au +197 Au . The production probability of SHFs strongly depends on the incident energy and a narrowly peaked energy dependence of production probability is found. The decay mechanism of the composite system of projectile and target is studied and the time scale of decay process is explored. The binding energies and the shapes of SHFs are studied. The binding energies of SHFs are broadly distributed and the shapes of SHFs are strongly deformed.

Numerical Study of the Role of Magnetic Field Ramping Rate on the Structure Formation in Magnetorheological Fluids

1999 ◽  
Vol 13 (14n16) ◽  
pp. 2060-2067 ◽  
Author(s):  
M. Mohebi ◽  
N. Jamasbi ◽  
G. A. Flores ◽  
Jing Liu
Keyword(s):  
Magnetic Field ◽  
Molecular Dynamics ◽  
Applied Field ◽  
Numerical Study ◽  
Dynamics Model ◽  
Structural Formation ◽  
Mr Fluids ◽  
Maximum Range ◽  
Simulation Results

A molecular dynamics model is presented to understand the structural formation of MR fluids by including the thermal motion of the particles. The simulation results indicate that the complexity of the lateral pattern as viewed in the direction of the applied field increases with the rate of the application of external magnetic field. We have also found that the maximum range for attractive interaction (escape distance) for two initially straight chains increases with temperature. These results are relevant to understand the mechanisms and conditions for the formation of labyrinthine and columnar patterns found in MR fluids.

Role of point defects in self-diffusion along low-angle twist boundaries in fcc metals: A molecular dynamics study

2018 ◽  
Vol 03 (01n02) ◽  
pp. 1850001 ◽  
Author(s):  
G. M. Poletaev ◽  
I. V. Zorya ◽  
M. D. Starostenkov
Keyword(s):  
Molecular Dynamics ◽  
Grain Boundary ◽  
Point Defects ◽  
Binding Energies ◽  
Fcc Metals ◽  
Self Diffusion ◽  
Thermodynamic Equilibrium Condition ◽  
Dynamics Method ◽  
Twist Boundaries

The interaction of point defects with low-angle (100), (110) and (111) twist boundaries in fcc metals Ni, Cu, Al and role of the point defects in self-diffusion along considered boundaries were studied by the molecular dynamics method. The binding energies of point defects with low-angle twist boundaries were calculated. It was found that the point defects are mainly fixed in the nodes of grain-boundary screw dislocations network. It was shown that the introduced vacancies play an important role in diffusion along twist grain boundaries. The contribution of introduced interstitial atoms to grain-boundary diffusion under thermodynamic equilibrium condition is less by several orders of magnitude in comparison with the contribution of vacancies.

scholarly journals FROM LIGHT NUCLEI TO NUCLEAR MATTER: THE ROLE OF RELATIVITY?

2003 ◽  
Vol 17 (28) ◽  
pp. 5327-5333 ◽  
Author(s):  
F. COESTER
Keyword(s):  
Nuclear Matter ◽  
Quantum Dynamics ◽  
Relativistic Quantum ◽  
Binding Energies ◽  
Light Nuclei ◽  
Nuclear Dynamics ◽  
Saturation Properties ◽  
Irreducible Unitary Representations ◽  
Relevant Degree

The success of non-relativistic quantum dynamics in accounting for the binding energies and spectra of light nuclei with masses up to A=10 raises the question whether the same dynamics applied to infinite nuclear matter agrees with the empirical saturation properties of large nuclei. The simple unambiguous relation between few-nucleon and many-nucleon Hamiltonians is directly related to the Galilean covariance of nonrelativistic dynamics. Relations between the irreducible unitary representations of the Galilei and Poincaré groups indicate that the "nonrelativistic" nuclear Hamiltonians may provide sufficiently accurate approximations to Poincaré invariant mass operators. In relativistic nuclear dynamics based on suitable Lagrangeans the intrinsic nucleon parity is an explicit, dynamically relevant, degree of freedom and the emphasis is on properties of nuclear matter. The success of this approach suggests the question how it might account for the spectral properties of light nuclei.

NON-MONOTONIC ALPHA- AND 6Li-POTENTIALS FROM ENERGY DENSITY FUNCTIONAL FORMALISM

2008 ◽  
Vol 22 (25n26) ◽  
pp. 4697-4708 ◽  
Author(s):  
S. HOSSAIN ◽  
A. K. BASAK ◽  
M. A. UDDIN ◽  
M. N. A. ABDULLAH ◽  
I. REICHSTEIN ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Energy Density ◽  
Density Functional ◽  
Mean Field ◽  
Pauli Principle ◽  
Binding Energies ◽  
Scattering Data ◽  
Functional Formalism ◽  
Energy Density Functional ◽  
Nucleon Potential

The present status of the α-nucleus potential, generated from the energy density functional (EDF) formalism using a realistic two-nucleon potential, which incorporates the Pauli principle, is discussed. The EDF potentials, calculated using a density distribution of α-particle that yields a binding energy of 20 MeV with a reasonable root-mean-squared radius and observed density distributions of 6 Li and various target nuclei, are found to be shallow and non-monotonic in character. This non-monotonic EDF potential reproduces satisfactorily the experimental elastic scattering data, particularly at energies above the Coulomb barrier. Since the elastic scattering data and the binding energies of all nuclei considered herein are well reproduced using the mean field generated from a realistic two-nucleon potential for nuclear and nucleonic matter, one may conclude to have reasonable information on the equation of states of nuclear and nucleonic matter from a very low to the saturation density from the present investigation.

You Are the One I Want to Communicate With!

2013 ◽  
Vol 44 (1) ◽  
pp. 16-25 ◽  
Author(s):  
Sabrina Pierucci ◽  
Olivier Klein ◽  
Andrea Carnaghi
Keyword(s):  
Memory Bias ◽  
Shared Reality ◽  
Communication Partner ◽  
Shared Reality Theory ◽  
The One ◽  
Study Participants

This article investigates the role of relational motives in the saying-is-believing effect ( Higgins & Rholes, 1978 ). Building on shared reality theory, we expected this effect to be most likely when communicators were motivated to “get along” with the audience. In the current study, participants were asked to describe an ambiguous target to an audience who either liked or disliked the target. The audience had been previously evaluated as a desirable vs. undesirable communication partner. Only participants who communicated with a desirable audience tuned their messages to suit their audience’s attitude toward the target. In line with predictions, they also displayed an audience-congruent memory bias in later recall.

The Formation of Intermediate Product I in a Purified System The Role of Factor IX or of its Precursor and of a Hageman Factor-PTA Fraction

1961 ◽  
Vol 6 (02) ◽  
pp. 224-234 ◽  
Author(s):  
E. T Yin ◽  
F Duckert
Keyword(s):  
Intermediate Product ◽  
Factor Ix ◽  
Assay Method ◽  
Lag Phase ◽  
Factor X ◽  
Haemophilia B ◽  
Hageman Factor ◽  
One Stage ◽  
The One

Summary1. The role of two clot promoting fractions isolated from either plasma or serum is studied in a purified system for the generation of intermediate product I in which the serum is replaced by factor X and the investigated fractions.2. Optimal generation of intermediate product I is possible in the purified system utilizing fractions devoid of factor IX one-stage activity. Prothrombin and thrombin are not necessary in this system.3. The fraction containing factor IX or its precursor, no measurable activity by the one-stage assay method, controls the yield of intermediate product I. No similar fraction can be isolated from haemophilia B plasma or serum.4. The Hageman factor — PTA fraction shortens the lag phase of intermediate product I formation and has no influence on the yield. This fraction can also be prepared from haemophilia B plasma or serum.

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