Peoples' Friendship University of Russia

www.rudn.ru
Moscow, Russia

The Peoples' Friendship University of Russia is an educational and research institution located in southern Moscow. It is ranked by the Ministry of Education of Russia as the country's third-best university after Moscow State University and Saint Petersburg State University Wikipedia.


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Chernetsova E.S.,Peoples' Friendship University of Russia | Morlock G.E.,University of Hohenheim
Mass Spectrometry Reviews | Year: 2011

Direct analysis in real time (DART), a relatively new ionization source for mass spectrometry, ionizes small-molecule components from different kinds of samples without any sample preparation and chromatographic separation. The current paper reviews the published data available on the determination of drugs and drug-like compounds in different matrices with DART-MS, including identification and quantitation issues. Parameters that affect ionization efficiency and mass spectra composition are also discussed. © 2011 Wiley Periodicals, Inc.


Ivashchuk V.D.,Peoples' Friendship University of Russia
International Journal of Geometric Methods in Modern Physics | Year: 2010

A (n + 1)-dimensional Einstein-Gauss-Bonnet (EGB) model is considered. For diagonal cosmological-type metrics, the equations of motion are reduced to a set of Lagrange equations. The effective Lagrangian contains two "minisuperspace" metrics on ℝn. The first one is the well-known 2-metric of pseudo-Euclidean signature and the second one is the Finslerian 4-metric that is proportional to n-dimensional Berwald-Moor 4-metric. When a "synchronous-like" time gauge is considered, the equations of motion are reduced to an autonomous system of first-order differential equations. For the case of the "pure" GaussBonnet model, two exact solutions with power-law and exponential dependence of scale factors (with respect to "synchronous-like" variable) are obtained. (In the cosmological case, the power-law solution was considered earlier in papers of N. Deruelle, A. Toporensky, P. Tretyakov and S. Pavluchenko.) A generalization of the effective Lagrangian to the Lowelock case is conjectured. This hypothesis implies existence of exact solutions with power-law and exponential dependence of scale factors for the "pure" Lowelock model of mth order. © 2010 World Scientific Publishing Company.


Ivashchuk V.D.,Peoples' Friendship University of Russia
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2010

A family of spherically symmetric solutions with horizon in the model with m-component anisotropic fluid is presented. The metrics are defined on a manifold that contains a product of n-1 Ricci-flat "internal" spaces. The equation of state for any s-th component is defined by a vector Us belonging to Rn+1. The solutions are governed by moduli functions Hs obeying non-linear differential equations with certain boundary conditions imposed. A simulation of black brane solutions in the model with antisymmetric forms is considered. An example of solution imitating M2-M5 configuration (in D=11 supergravity) corresponding to Lie algebra A2 is presented. © 2010 Elsevier B.V.


Jargin S.V.,Peoples' Friendship University of Russia
International Journal of Health Services | Year: 2012

After the Chernobyl accident, many publications appeared that overestimated its medical consequences. Some of them are discussed in this article. Among the motives for the overestimation were anti-nuclear sentiments, widespread among some adherents of the Green movement; however, their attitude has not been wrong: nuclear facilities should have been prevented from spreading to overpopulated countries governed by unstable regimes and regions where conflicts and terrorism cannot be excluded. The Chernobyl accident has hindered worldwide development of atomic industry. Today, there are no alternatives to nuclear power: nonrenewable fossil fuels will become more and more expensive, contributing to affluence in the oil-producing countries and poverty in the rest of the world. Worldwide introduction of nuclear energy will become possible only after a concentration of authority within an efficient international executive. This will enable construction of nuclear power plants in optimally suitable places, considering all sociopolitical, geographic, geologic, and other preconditions. In this way, accidents such as that in Japan in 2011 will be prevented. © 2012, Baywood Publishing Co., Inc.


Sheka E.F.,Peoples' Friendship University of Russia
International Journal of Quantum Chemistry | Year: 2012

The correlation of odd electrons in graphene turns out to be significant so that the species should be attributed to correlated ones. This finding profoundly influences the computational strategy addressing it to multireference computational schemes. Owing to serious problems related to the schemes realization, a compromise can be suggested using single-determinant approaches based on either Hartree-Fock or density-functional theory in the form of unrestricted open-shell presentation. Both computational schemes enable to fix the electron correlation, whereas only the Hartree-Fock theory suggests a set of quantities to be calculated that can quantitatively characterize the electron correlation and be used for a quantitative description of such graphene properties as magnetism, chemical reactivity, and mechanical response. The article presents concepts and algorithms of the unrestricted Hartree-Fock theory applied for the consideration of magnetic properties of nanographenes, their chemical modification by the example of stepwise hydrogenation, as well as a possible governing the electron correlation by the carbon skeleton deformation. © 2012 Wiley Periodicals, Inc.


Sheka E.F.,Peoples' Friendship University of Russia
International Journal of Quantum Chemistry | Year: 2013

The odd-electron molecular theory, which takes into account the electron correlation, has been applied for a comparative consideration of sp2 nanocarbons and their siliceous analogues. Four characteristic quantities that involve the energy misalignment, the number of effectively unpaired electrons, the squared spin value, and C-C and Si-Si chemical bond lengths have been suggested to classify the extent of the odd electron correlation in both families. Providing a considerable enlargement of the internuclear distances, the electron correlation in siliceous species is extremely strong thus resulting in complete radicalization of the species and proving the impossibility of their existence at ambient conditions in contrast to carboneous ones that are not so strong correlated. © 2012 Wiley Periodicals, Inc.


Milant'ev V.P.,Peoples' Friendship University of Russia
Physics-Uspekhi | Year: 2013

Commemorating the 50th anniversary of the discovery of cyclotron autoresonance, this paper briefly reviews how the experimental and theoretical aspects of this field of research have been developed over time.


Patent
Peoples' Friendship University of Russia | Date: 2011-12-19

In the method, a pre-selected working area of a graphene film with a linear dimension of 2,000 nm, which working area is divided into sections having a dimension of 50-100 nm, is subjected to the effect of a pulsed alternating magnetic field with a frequency of 3 terahertz that corresponds to the transition from the ground energy level, corresponding to the non-excited state of spin density, to a fourth working energy level of the excited state of spin density in the graphene film, thus causing spin density pumping. A spatially localized external magnetic field is generated around the edges of the working area, which resonantly reflects spinons having a working frequency of 0.5-1 terahertz that corresponds to the transition from a third working energy level to a second working energy level of the excited state of spin density, said spinons causing the induced coherent radiation of working frequency spin waves as they pass thorough the working area.


Grant
Agency: European Commission | Branch: FP7 | Program: MC-IIFR | Phase: FP7-PEOPLE-2011-IIF | Award Amount: 15.00K | Year: 2014

There will be considered covering mappings and their applications. The properties of covering mappings in generalized metric spaces will be studied. Moreover, sufficient solvability conditions for inclusions defined by conditionally covering multi-valued mappings in metric spaces will be obtained. This results will be applied to the following problems. For difference equations there will be studied such issues as solvability, equilibrium existence and stability. In addition, there will be studied several types of functional equations. This part of research will be based on the result obtained for covering mappings in generalized metric spaces. Finally, there will be studied questions of global solvability for control systems and necessary optimality conditions for control systems defined by Volterra equations.


Patent
Peoples' Friendship University of Russia | Date: 2013-10-30

In the method, a pre-selected working area of a graphene film with a linear dimension of 2,000 nm, which working area is divided into sections having a dimension of 50-100 nm, is subjected to the effect of a pulsed alternating magnetic field with a frequency of 3 terahertz that corresponds to the transition from a ground energy level, corresponding to the non-excited state of spin density, to a fourth working energy level of the excited state of spin density in the graphene film, thus causing spin density pumping. A spatially localized external magnetic field is generated around the edges of the working area, which resonantly reflects spinons with a working frequency of 0.5-1 terahertz that corresponds to the transition from a third working energy level to a second working energy level of the excited state of spin density, said spinons causing the induced coherent radiation of working frequency spin waves as they pass through the working area.

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