New thermoplastic elastomers based on isotactic polypropylene and a ternary ethylenepropylenediene elastomer of different composition (with and without oil) with the use of nanofillers containing ...nanoparticles of oxides of different metals have been developed. It is shown that a small addition of nanofiller has practically no effect on the crystallinity and dielectric permittivity of the thermoplastic elastomers, but lowers their elastic modulus. The size of the nanoparticles has a considerable effect on the mechanical properties of the materials. The introduction of nanofillers into blends based on oil-extended elastomer does not affect their properties.
The effect of quartz four, whiting, and cement on the physicomechanical properties of filled polymer composites based on a statistical polypropylene copolymer – random polypropylene copolymer – was ...investigated.
•We discuss the structure of Pygmy Dipole Resonance (PDR) and the Giant Dipole Resonance (GDR).•Translational and Galilean invariant (TGI-) quasiparticle random phase approximation (QRPA) was ...applied.•Through cross-section calculations, we provide information about the structure of the GDR and PDR modes, as well as the splitting between the K = 0 and K = 1 branches.
For the first time, this study investigated an energy region that covers both the Pygmy Dipole Resonance (PDR) and the Giant Dipole Resonance (GDR) for a broad set of even-even erbium isotopes. More specifically, translational and Galilean invariant (TGI-) quasiparticle random phase approximation (QRPA) was applied to investigate eight even-even 156–170Er isotopes. Through cross-section calculations, we obtained information about the structure of the GDR and PDR modes, as well as the splitting between the K = 0 and K = 1 branches. The PDR region was explored in more detail by investigating the region up to both 8 MeV and 10 MeV to determine the main distribution area of the PDR. It was found that only the E1 strengths below 8 MeV matched well with the well-known systematics of the PDR.
Display omitted
Induced oxidation of C
10
–C
13
tricyclic bridged olefins synthesized from C
5
–C
8
cyclodiene hydrocarbons using hydrogen peroxide has been studied. It has been shown that phosphomolybdic heteropoly ...compounds supported on a finely divided carbon material and additionally modified with HBr and CoCO
3
or Gd
2
O
3
exhibit high activity in this reaction. Depending on the conditions of the experiments, the main reaction products are the corresponding oxiranes and diols that retain the structure of the reactant hydrocarbons.
The method of Pyatov, proposed for the exclusion of the spurious states associated with the spontaneous symmetry breaking due to the mean field approximation, is applied to restore broken translation ...and Galilean invariance of the Quasiparticle Phonon Nuclear Model (QPNM) Hamiltonian of deformed odd-mass nuclei for the first time. The point of the formulated translation and Galilean invariant (TGI-) QPNM is to study electric dipole (E1) response of odd-mass deformed nuclei. The proposed TGI-QPNM is tested by the calculations for fine and gross features of E1 resonance in 165Ho, 169Tm, and 235U in a wide range of excitation energy from 2 to 20 MeV. Predictions of the TGI-QPNM are shown to be in good agreement with the corresponding experimental data.
Abstract
The electric dipole E1 strength in the well-deformed even–even
152–162
Gd was calculated using a model based on translational and Galilean invariant quasi-particle random phase approximation ...(QRPA), where for the first time the highly-fragmented E1 strength has been predicted below the particle threshold energy. The predicted concentration of the electric dipole excitations exhausts less than 2% of the energy weighed sum rules (EWSR) below 20 MeV in rather good agreement with the experimental data for neighbor nuclei. Through cross sections, transition probabilities, and other properties, the electric dipole response was investigated in
152–162
Gd for a wide range of excitation energies from 5 to 20 MeV. The calculation that was performed with the elimination of effects associated with deformation revealed that the effects associated with neutron excess play a more significant role in the formation of the pygmy dipole resonance (PDR) strength when compared to the effects associated with a changing deformation. The calculations indicate the presence of magnetic dipole excitations with summed M1 strengths in the energy region between 5 and 8 MeV was less than 10% of the total dipole strength in the same energy region. We also took into account a recent experimental study of
156
Gd in our discussion and paid particular attention to this isotope.
The electric dipole E1 strength in the well-deformed even-even 152-162Gd was calculated using a model based on translational and Galilean invariant quasi-particle random phase approximation (QRPA), ...where for the first time the highly-fragmented E1 strength has been predicted below the particle threshold energy. The predicted concentration of the electric dipole excitations exhausts less than 2% of the energy weighed sum rules (EWSR) below 20 MeV in rather good agreement with the experimental data for neighbor nuclei. Through cross sections, transition probabilities, and other properties, the electric dipole response was investigated in 152-162Gd for a wide range of excitation energies from 5 to 20 MeV. The calculation that was performed with the elimination of effects associated with deformation revealed that the effects associated with neutron excess play a more significant role in the formation of the pygmy dipole resonance (PDR) strength when compared to the effects associated with a changing deformation. The calculations indicate the presence of magnetic dipole excitations with summed M1 strengths in the energy region between 5 and 8 MeV was less than 10% of the total dipole strength in the same energy region. We also took into account a recent experimental study of 156Gd in our discussion and paid particular attention to this isotope.
PDF
