.
The structure of the exotic
8
B nucleus is studied by means of elastic scattering, as well as its breakup on nuclear targets. We present microscopic calculations of the optical potentials (OPs) and ...cross sections of elastic scattering of
8
B on
12
C,
58
Ni, and
208
Pb targets at energies
20
<
E
<
170
MeV. The density distributions of
8
B obtained within the variational Monte Carlo (VMC) model and the three-cluster model (3CM) are used to construct the potentials. The real part of the hybrid OP is calculated using the folding model with the direct and exchange terms included, while the imaginary part is obtained on the base of the high-energy approximation (HEA) and also taken to be equal to the microscopic real part of the OP. In this model the only free parameters are the depths of the real and imaginary parts of OP obtained by fitting the elastic scattering experimental data. A dependence of their values on the model density of
8
B is found. In addition, the cluster model, in which
8
B consists of a
p
-halo and the
7
Be core, is applied to calculate the breakup cross sections of the
8
B nucleus on
9
Be,
12
C, and
197
Au targets, as well as momentum distributions of
7
Be fragments, and a comparison with the existing experimental data is made.
•Novel rechargeable electrode material based on poly(3,4-dihydroxystyrene).•Specific capacity of PDHS was found 54 mA h g−1.•PEDOT increases reversibility of redox transformation of PDHS.
The present ...study reports electrochemical performance of electrode materials based on poly(3,4-dihydroxystyrene) (PDHS) and its composites with conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT), deposited on glassy carbon electrodes, in diluted sulfuric acid. Poly(3,4-dihydroxystyrene), bearing redox active hydroquinone groups, was employed to the first time as an electrode material in combination with carbon, binder and conducting polymer. It was found that this quinone-based composite exhibits moderate electrochemical characteristics with specific capacity of about 50–54 mA h g−1. The comparison of rate constants obtained for GC/PDHS and GC/PEDOT/PDHS electrodes confirms the catalytic effect of conducting polymer PEDOT on the redox transformation of PDHS.
A microscopic analysis of the optical potentials (OPs) and cross sections of elastic scattering of
8
B on
12
C,
58
Ni, and
208
Pb targets at energies 20 < E < 170 MeV and
12,14
Be on
12
C at 56 ...MeV/nucleon is carried out. The real part of the OP is calculated by a folding procedure and the imaginary part is obtained on the base of the high-energy approximation (HEA). The density distributions of
8
B evaluated within the variational Monte Carlo (VMC) model and the three-cluster model (3CM) are used to construct the potentials. The
14
Be densities obtained in the framework of the the generator coordinate method (GCM) are used to calculate the optical potentials, while for the same purpose both the VMC model and GCM densities of
12
Be are used. In the hybrid model developed and explored in our previous works, the only free parameters are the depths of the real and imaginary parts of OP obtained by fitting the experimental data. The use of HEA to estimate the imaginary OP at energies just above the Coulomb barrier is discussed. In addition, cluster model, in which
8
B consists of a p-halo and the
7
Be core, is applied to calculate the breakup cross sections of
8
B nucleus on
9
Be,
12
C, and
197
Au targets, as well as momentum distributions of
7
Be fragments. A good agreement of the theoretical results with the available experimental data is obtained. It is concluded that the reaction studies performed in this work may provide supplemental information on the internal spatial structure of the proton- and neutron-halo nuclei.
Here we applied photochromic spiropyran-based salts SP1 and SP2 as light-sensitive components of OFET-based non-volatile optical memory elements. Electrooptical programming by applying simultaneously ...light bias and gate (programming) voltage allowed us to demonstrate wide memory windows, high programming speeds (programming time of 0.5–20 ms), and good retention characteristics of the devices. It is remarkable that a minor difference in the molecular structures of the used spiropyran-based salts (the hydrogen atom in the structure of SP1 is replaced with the NO 2 group in SP2 ) altered completely the behavior of the devices. Thus, OFETs comprising interlayers of the spiropyran-based salt SP1 showed a reversible photoelectrical switching which is characteristic for flash memory elements with good write–read–erase cycling stability. In contrast, devices based on the spiropyran-based salt SP2 demonstrated irreversible switching and operated as read-only memory (ROM). Both types of devices revealed the formation of multiple distinct electrical states thus resembling the behavior of multibit memory elements capable of high-density information storage.
Polymeric micelles have a whole set of unique characteristics, which make them very promising drug carriers, in particular, for poorly soluble drugs. Our review article focuses on micelles prepared ...from conjugates of water-soluble polymers, such as polyethylene glycol (PEG) or polyvinyl pyrrolidone (PVP), with phospholipids or long-chain fatty acids. The preparation of micelles from certain polymer–lipid conjugates and the loading of these micelles with various poorly soluble anticancer agents are discussed. The data on the characterization of micellar preparations in terms of their morphology, stability, longevity in circulation, and ability to spontaneously accumulate in experimental tumors via the enhanced permeability and retention (EPR) effect are presented. The review also considers the preparation of targeted immunomicelles with specific antibodies attached to their surface. Available in vivo results on the efficiency of anticancer drugs incorporated into plain micelles and immunomicelles in animal models are also discussed.
The operating principle of innovative interval radon exposure meters INERAD (types IE-2 and IE-4) is described. The major technical features of the both models have been standardized as much as ...possible. The exposure meters use the LR-115 type 2 track threshold detector, which is sensitive to alpha particles.
➢Iinnovative radon exposure meters with solid-state track detectors for long-term integral measurements of radon activity concentration with separation of values by time intervals (periods) have been developed and created.➢An essential feature of the developed interval radon exposure meters is the use of a threshold track detector.➢Two models of radon interval exposure meters are presented: with one detector - IE-2 (“On” - “Off”) and with four detectors - IE-4 (many variants of measurement programs).➢The proposed radon exposure meters can be used in many situations in which it is necessary to obtain data on radon concentrations at specified time intervals (radon exposure in workplaces, schools and kindergartens, scientific research, etc.).
We present the results of applying the Lagrangian methods to study the fine dynamic structure of the stratospheric polar vortex in the winter–spring of 2019–2020. Characteristics of the vortex ...structure for this winter are compared with those of a strong polar vortex and the winter of 2018–2019, when the vortex was weak. Due to the low activity of planetary waves, the polar vortex in 2019–2020 remained stable until the end of April, which created the conditions for record ozone destruction in the Arctic. We present variations of the horizontal dynamic structure obtained using reverse domain filling (RDF) and the vortex strength represented as an M function depending on time and altitude. Variations in ozone and thermodynamic parameters averaged over the ensemble of trajectories inside the vortex using the ERA5 reanalysis data are also presented.
The peculiarities of the troposphere and stratosphere dynamic processes that accompanied cooling events (cold waves) with a duration of more than a week in the northwest of European Russia (on the ...example of St. Petersburg) and in its north and center (on the example of Moscow) in early and late December 2021, respectively, are analyzed using reanalysis data, station observations, and trajectory modeling. In both cases the daily temperatures dropped below −10°C, and cold waves were accompanied by the air mass transport from the northeast
The Arctic stratosphere winter season of 2020–2021 was characterized by a weakened stratospheric polar vortex as a result of a major sudden stratospheric warming (SSW) in early January. After the ...SSW, which persisted for about 3 weeks, and until the end of the winter season, the lower stratosphere temperature inside the stratospheric polar vortex remained higher than required for the formation of polar stratospheric clouds.
Cu–14 wt% Al–4 wt% Ni alloy demonstrating the shape memory effect has been subjected to plastic deformation by means of uniaxial compression (upset). The process has been controlled by measuring the ...strain rate, applied stress, and compression ratio of standard specimens under isothermal conditions in the interval 400–600°C. Structural modifications in the alloy after mechanical tests have been studied by optical, scanning, and transmission microscopy methods and using X-ray phase analysis. It has been found that grains in the alloy became much finer (from 1 mm to 100 μm across) and its strength and ductility improved owing to dynamic recrystallization.
PDF
