scholarly journals The Spectral Features of Polyatomic Molecules Multiphoton Excitation in a Strong IR-Laser Field

1992 ◽  
Vol 12 (3-4) ◽  
pp. 147-172 ◽  
Author(s):  
S. S. Alimpiev ◽  
B. G. Sartakov
Keyword(s):  
Experimental Data ◽  
Computer Simulation ◽  
High Pressure ◽  
Laser Field ◽  
Polyatomic Molecules ◽  
Spectral Features ◽  
Multiphoton Excitation ◽  
Excitation Spectra ◽  
Ir Laser ◽  
Good Agreement

The experimental data on multiphoton excitation of polyatomic molecules in strong fields of high pressure continuously tunable CO2 lasers are presented. The program package for computer simulation of multiphoton excitation spectra and excitation dynamics is developed. Good agreement between computer simulation and experimental data is observed.

scholarly journals CO2 Induced Foaming Behavior of Polystyrene near the Glass Transition

2017 ◽  
Vol 2017 ◽  
pp. 1-15
Author(s):  
Salah Al-Enezi
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Glass Transition ◽  
Dissolved Gas ◽  
Foaming Process ◽  
Foaming Behavior ◽  
Potential Applications ◽  
Model C ◽  
Parameter Values ◽  
Good Agreement

This paper examines the effect of high-pressure carbon dioxide on the foaming process in polystyrene near the glass transition temperature and the foaming was studied using cylindrical high-pressure view cell with two optical windows. This technique has potential applications in the shape foaming of polymers at lower temperatures, dye impregnation, and the foaming of polystyrene. Three sets of experiments were carried out at operating temperatures of 50, 70, and 100°C, each over a range of pressures from 24 to 120 bar. Foaming was not observed when the polymer was initially at conditions below Tg but was observed above Tg. The nucleation appeared to occur randomly leading to subsequent bubble growth from these sites, with maximum radius of 0.02–0.83 mm. Three models were applied on the foaming experimental data. Variable diffusivity and viscosity model (Model C) was applied to assess the experimental data with the WLF equation. The model shows very good agreement by using realistic parameter values. The expansion occurs by diffusion of a dissolved gas from the supersaturated polymer envelope into the bubble.

Computer Simulation of Channeling Profile Analysis of Implantation Damage

1998 ◽  
Vol 532 ◽  
Author(s):  
Matthias Posselt
Keyword(s):  
Experimental Data ◽  
Computer Simulation ◽  
Depth Profile ◽  
Profile Analysis ◽  
Binary Collision ◽  
Comparison Of Results ◽  
Implantation Damage ◽  
Good Agreement

ABSTRACTChanneling profile analysis is simulated using the dynamic binary collision code Crystal- TRIM. A good agreement between theoretical and experimental data is found for silicon targets which were predamaged by Si+ ions of different energies and analyzed by 140 keV B+ ions. For each example the depth profile of the defects relevant for the dechanneling of the analyzing ions is given. An estimate of the annealing of such defects is obtained by comparison of results for as-implanted and annealed samples.

scholarly journals Phase Behavior at High Pressure of the Ternary System: CO2, Ionic Liquid and Disperse Dye

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Helen R. Mazzer ◽  
José C. O. Santos ◽  
Vladimir F. Cabral ◽  
Claudio Dariva ◽  
Marcos H. Kunita ◽  
...  
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
High Pressure ◽  
Phase Behavior ◽  
Ternary Systems ◽  
High Pressure Phase Behavior ◽  
Phase Transition Pressure ◽  
Binary And Ternary Systems ◽  
Pressure Phase ◽  
Good Agreement

High pressure phase behavior experimental data have been measured for the systems carbon dioxide (CO2) + 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim] [PF6]) and carbon dioxide (CO2) + 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim] [PF6]) + 1-amino-2-phenoxy-4-hydroxyanthraquinone (C.I. Disperse Red 60). Measurements were performed in the pressure up to 18 MPa and at the temperature (323 to 353 K). As reported in the literature, at higher concentrations of carbon dioxide the phase transition pressure increased very steeply. The experimental data for the binary and ternary systems were correlated with good agreement using the Peng-Robinson equation of state. The amount of water in phase behavior of the systems was evaluated.

High-Pressure Elastic Constant of Some Materials of Earth’s Mantle

2016 ◽  
Vol 71 (5) ◽  
pp. 433-437
Author(s):  
Quan Liu
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Theoretical Model ◽  
Elastic Behaviour ◽  
Exponential Relationship ◽  
Earth’S Mantle ◽  
Simple Theoretical Model ◽  
Volume Dependence ◽  
Theoretical Investigations ◽  
Good Agreement

AbstractIn the present work, an exponential relationship for the volume dependence of the Anderson–Grüneisen parameter along isotherm and the formulation derived from Tallon’s model have been used to develop a simple theoretical model for the elastic constants as a function of pressure. Applying it to some materials of earth’s mantle at different pressure ranges, the calculated results are in good agreement with the earlier theoretical investigations and available experimental data and thus show that our theory can be applied for predicting the elastic behaviour of earth materials at high pressure.

Spectroscopy of the polyatomic molecules, excited by an intense IR laser field

1984 ◽  
Vol 115 ◽  
pp. 225-228
Author(s):  
S.S. Alimpiev ◽  
N.V. Karlov ◽  
E.M. Khokhlov ◽  
B.G. Sartakov ◽  
B.O. Zikrin
Keyword(s):  
Laser Field ◽  
Polyatomic Molecules ◽  
Ir Laser

NANOMATERIALS UNDER HIGH TEMPERATURE AND HIGH PRESSURE

2010 ◽  
Vol 24 (26) ◽  
pp. 2647-2657 ◽  
Author(s):  
R. KUMAR ◽  
UMA D. SHARMA ◽  
MUNISH KUMAR
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Thermal Expansion ◽  
High Temperature ◽  
Constant Pressure ◽  
Effect Of Temperature ◽  
Effect Of Pressure ◽  
Approaches To Study ◽  
Theory And Experiment ◽  
Good Agreement

Two different approaches to study thermal expansion and compression of nanosystems are unified, which have been treated quite independently by earlier workers. We provide the simple theoretical analysis, which demonstrates that these two approaches may be unified into a single theory, viz. one can be derived from other. It is concluded that there is a single theory in the place of two different approaches. To show the real connection with the nanomaterials, we study the effect of temperature (at constant pressure), the effect of pressure (at constant temperature) as well as the combined effect of pressure and temperature. We have considered different nanomaterials viz. carbon nanotube, AlN , Ni , 80 Ni –20 Fe , Fe – Cu , MgO , CeO 2, CuO and TiO 2. The results obtained are compared with the available experimental data. A good agreement between theory and experiment demonstrates the validity of the present approach.

Study of point defects in alkaline-earth sulfides

1988 ◽  
Vol 3 (6) ◽  
pp. 1362-1366 ◽  
Author(s):  
Ravindra Pandey ◽  
A. Barry Kunz ◽  
John M. Vail
Keyword(s):  
Experimental Data ◽  
Computer Simulation ◽  
Point Defects ◽  
Simulation Study ◽  
Alkaline Earth ◽  
Computer Simulation Study ◽  
Vacancy Migration ◽  
Absorption Energy ◽  
Good Agreement

The results of a computer simulation study of point defects including vacancy, interstitial, and F+ center in alkaline-earth sulfides are presented. The study is based on ICECAP/HADES simulation procedures and uses empirical interionic potentials obtained from the analysis of macroscopic data for these materials. The results predict the dominance of Schottky disorder and suggest that vacancy migration predominates in alkaline-earth sulfides. Furthermore, the calculated F+ center absorption energy is in good agreement with the experimental data deduced from the optical stimulated studies in these materials.

scholarly journals Applicability of Different Isothermal EOS at Nanomaterials

2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
Deepika P. Joshi ◽  
Anjali Senger
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Pressure Range ◽  
Theoretical Study ◽  
Isothermal Bulk Modulus ◽  
Relative Compression ◽  
Experimental Values ◽  
Murnaghan Equation ◽  
Two Parameter ◽  
Good Agreement

The present study explains the behaviour of nanomaterials such as AlN, CdSe, Ge, WC, and Ni- and Fe-filled-MWCNTs under high pressure. Among the number of isothermal EOSs available, we prefer only two parameter-based isothermal equations (i.e., Murnaghan equation, usual Tait's equation, Suzuki equation and Shanker equation). The present work shows the theoretical study of thermo-elastic properties especially relative compression (V/V0), isothermal bulk modulus (KP/K0), and compressibility (αP/α0) of nanomaterials. After comparing all formulations with available experimental data, we conclude that pressure dependence of relative compression (V/V0) for the nanomaterials, are in good agreement for all the equations at lower pressure range. At higher pressure range, Suzuki and Shanker formulations show some deviation from experimental values.

scholarly journals TO THE PROBLEM OF DETERMINING THE COEFFICIENT OF THERMAL EXPANSION OF MATERIALS

2020 ◽  
pp. 284-292
Author(s):  
Денис Васильевич Пьянзин ◽  
Николай Александрович Панькин ◽  
Александр Николаевич Чалдышкин ◽  
Николай Иванович Чистяков
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Computer Simulation ◽  
Thermal Expansion ◽  
Software Package ◽  
Coefficient Of Thermal Expansion ◽  
Metallic Materials ◽  
Ansys Software ◽  
Simulation Results ◽  
Good Agreement

Проведено экспериментальное исследование и компьютерное моделирование в программном комплексе ANSYS термического воздействия на металлический материал. Отмечается уменьшение значений коэффициента теплового расширения при увеличении скорости нагрева образца. Показано, что данное поведение обусловлено наличием градиента температур между его центральной и поверхностью частями. Отмечается хорошее согласие результатов компьютерного моделирования с соответствующими экспериментальными данными. Значения коэффициента теплового расширения близки к истинным, которые были определены при малых скоростях нагрева/охлаждения или при длительной выдержке образца при конечной и начальной температурах. Результаты моделирования в ANSYS могут быть использованы при интерпретации и прогнозировании тепловых свойств металлических материалов. An experimental study and computer modeling in the ANSYS software package of the thermal effect on a metal material was carried out. A decrease in the values of the coefficient of the thermal expansion is noted with an increase in the heating rate of the sample. It is shown that this behavior is due to the presence of the temperature gradient between its central and surface parts. Good agreement of the results of computer simulation with the corresponding experimental data is found. The values of the coefficient of thermal expansion are close to true ones determined at low heating / cooling rates or with long exposure of the sample at the final and initial temperatures. The simulation results in ANSYS can be used to interpret and predict thermal properties of metallic materials.

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