Hydrothermal synthesis of zeolites from coal fly ash

The fly ash, from the combustion of coal to produce energy and heat, is an industrial waste, in which large accumulations represent a serious environmental threat. To reduce the environmental burden and improve the economic benefits of energy production, the science and industry focus on the transformation of coal combustion byproducts into new functional materials. The fly ash was studied by modern analytical methods. As a result of the hydrothermal reaction, several types of zeolites were synthesised from the fly ash: analcime, faujasite (zeolite X) and gismondine (zeolite P). It was shown that the experimental conditions (temperature, reaction time and alkali concentration) have a significant influence on the type of zeolite and its content in the reaction products. The series of experiments resulted in building approximate crystallisation field of zeolites and other phases as the first stage of the formation of ceramic membrane and other materials

Motivation to learn foreign languages among linguistics students (socio-cultural aspect)

Целью данного исследования является изучение формирования мотивации студентов направления 45.03.02 «Лингвистика» УрФУ им. Б. Н. Ельцина, а также группы иностранных студентов в социокультурном аспекте. Для достижения поставленной цели были проведены опросы, которые отражают факторы, влияющие на формирование внутренней и внешней мотивации студентов. Результаты исследования позволяют сделать вывод о том, что поддержание социокультурного компонента способствует повышению мотивации, развитию потребностей и интересов обучающихся, а также осознанному изучению иностранного языка.The aim of the research is to study the formation of motivation of students of 45.03.02 "Linguistics" of the Ural Federal University named after B. N. Yeltsin, as well as the group of foreign students in the socio-cultural aspect. In order to achieve the set goal, surveys were conducted reflecting the factors influencing the formation of the intrinsic and the extrinsic motivation of students during the process of foreign language learning. The results of the research allow us to conclude that maintaining the socio-cultural component contributes to increasing motivation, developing learners' needs and interests, as well as making the learning of a foreign language more conscious

Photo-response of the <i>N</i> = <i>Z </i>nucleus ²⁸Si below 13.0 MeV

The electric E1 and magnetic M1 dipole responses of the N = Z nucleus 28Si were investigated in a nuclear resonance fluorescence experiment at the ELBE accelerator of the Helmholtz Zentrum Dresden-Rossendorf. The investigated energy range extends to 13.0 MeV, which corresponds to the kinetic energy of the electrons that were used to produce the unpolarised bremsstrahlung in the entrance channel of the 28Si(ϒ,ϒ' ) reaction. The bremsstrahlung photons excited three Jπ = 1-, seven Jπ = 1+ , and several Jπ = 2+ states. De-excitation Υ rays were detected using the four high-purity germanium detectors of the γELBE setup. The excellent background conditions allowed to identify nine previously unobserved Υ-ray transitions. In the investigated energy region of up to 13.0 MeV a total ∑i B(M1,0+ → 1i+) = 5.0 (3) μ2N strength is firmly observed with a possible addition of B(M1,0+ → 1i+) ≤ 0.14 μ2N from levels for which the data allows to establish only an upper limit. Furthermore, below 13 MeV this N = Z nucleus exhibits a marginal isoscalar E1 strength of ∑i B(E1,0+ → 1-) = 2.6(3_ x 10-3 e2 fm2 , which exhausts only 0.026(2) % of the energy-weighted sum rule

Restoring the valence-shell stabilization in Nd-140

A projectile Coulomb-excitation experiment was performed at the radioactive-ion beam facility HIE-ISOLDE at CERN to obtain E2 and M1 transition matrix elements of Nd-140 using the multistep Coulomb-excitation code GOSIA. The absolute M1 strengths, B(M1; 2(2)(-) -> 2(1)(+)) = 0.033(8)mu(2)(N), B(M1 ; 2(3)(+) -> 2(1)(+)) = 0.26(-0.10)(+0.11)mu(2)(N), and B(M1; 2(4)+ -> 2(1)(+)) <0.04 mu(2)(N) identify the 2(3)(+) state as the main fragment of the one-quadrupole-phonon proton-neutron mixed-symmetry state of Nd-140. The degree of F-spin mixing in Nd-140 was quantified with the determination of the mixing matrix element VF-mix <7(-7)(-13) keV.Peer reviewe

Lifetime measurements of the low-lying excited states of ²⁰⁸Po

In this study we present the preliminary results about the lifetimes of the 2₂⁺, 4₁⁺ states of ²⁰⁸Po and the upper limit of the lifetime of the 2₁⁺ state. For measuring the lifetimes of the 2₁⁺ and 4₁⁺ states the Recoil Distance Doppler Shift (RDDS) method and for the lifetime of the 2₂⁺ state the Doppler Shift Attenuation method (DSAM) were used. The resulting absolute transition strength B(M1 ; 2₂⁺ → 2₁⁺) ≥ 0.122(20) μN² reveals the predominant isovector nature of the 2₂⁺ state of ²⁰⁸Po

Search for mixed-symmetry states in ²¹²Po

In this work we present an experiment dedicated to searching for quarupole- collective isovector valence-shell excitation — the states with so-called mixed proton-neutron symmetry (MSSs), in the nucleus ²¹²Po. The states of interest were populated and studied by an α-transfer reaction. The experiment provides indication for existence of one-phonon MSS in the nucleus ²¹²Po which is the first experimentally identified MSS in the region around double magic nucleus ²⁰⁸Pb

Evolution of the structure of the 4₁⁺ states in Po isotopes

The lifetime of the 4₁⁺ state in ²⁰⁸Po has been measured using γ − γ fast-timing technique with LaBr₃(Ce) Detectors. The experiment was performed at the FN Tandem facility at the University of Cologne. The preliminary results are discussed in the scope of the systematic behavior of the transition strengths between yrast states in polonium isotopes

Search formixed-symmetry states of nuclei in the vicinity of the double-magic nucleus 208Pb

In this work we present the results from two experiments dedicated to search for quadrupolecollective isovector valence-shell excitation, the states with so-called mixed proton-neutron symmetry (MSS), in nuclei around the doubly magic nucleus 208Pb. 212Po was studied in an α-transfer reaction. 204Hg was studied in an inverse kinematics Coulomb excitation reaction on a carbon target. Both experiments provide indications for existence of one-phonon MSSs. Those are the first experimentally identified MSSs in the mass A ≈ 208 region