Historical Analysis of the Social Policy of Uzbekistan (On the Example of the Regions of the Lower Reaches of Zarafshan)

The need to form an effective social policy aimed at supporting a decent level of social security is one of the most important democratic values of developing countries. The traditional approach to social development as a consequence of economic development, Uzbekistan inherited from the former Soviet system. In the conditions of transition to market relations, new systems of norms of social interaction between the state and society were developed. There have been extremely ambiguous changes in the factors of social development. The loss of planned mechanisms has led to the introduction of new social mechanisms, including problems of unemployment, medical care, education, the fight against poverty. The article analyzes the policy of Uzbekistan in the field of social development, identifies the specifics of social development, changes in the well-being of the population of the Nizhnezeravshan region in a changing economic and social environment

Two dimensional dynamical systems which admit Lie and Noether symmetries

We prove two theorems which relate the Lie point symmetries and the Noether symmetries of a dynamical system moving in a Riemannian space with the special projective group and the homothetic group of the space respectively. The theorems are applied to classify the two dimensional Newtonian dynamical systems, which admit a Lie point/Noether symmetry. Two cases are considered, the non-conservative and the conservative forces. The use of the results is demonstrated for the Kepler - Ermakov system, which in general is non-conservative and for potentials similar to the H\`enon Heiles potential. Finally it is shown that in a FRW background with no matter present, the only scalar cosmological model which is integrable is the one for which 3-space is flat and the potential function of the scalar field is exponential. It is important to note that in all applications the generators of the symmetry vectors are found by reading the appropriate entry in the relevant tables.Comment: 25 pages, 17 table

Lie and Noether symmetries of geodesic equations and collineations

The Lie symmetries of the geodesic equations in a Riemannian space are computed in terms of the special projective group and its degenerates (affine vectors, homothetic vector and Killing vectors) of the metric. The Noether symmetries of the same equations are given in terms of the homothetic and the Killing vectors of the metric. It is shown that the geodesic equations in a Riemannian space admit three linear first integrals and two quadratic first integrals. We apply the results in the case of Einstein spaces, the Schwarzschild spacetime and the Friedman Robertson Walker spacetime. In each case the Lie and the Noether symmetries are computed explicitly together with the corresponding linear and quadratic first integrals.Comment: 19 page

Contribution of localized molecular orbitals to the proton magnetic screening constant of PX3 molecules

1. A calculation of the magnetic screening constants of the protons in the PH3 and P(CH3)3 molecules with the aid of localized molecular orbitals has been carried out for the first time. 2. The contribution to σ from the canonical and localized molecular orbitals coincide with sufficient accuracy. 3. Localized molecular orbitals make it possible to individually evaluate the contribution of the bonds and lone pairs to the magnetic screening constant. © 1980 Plenum Publishing Corporation

Electronic and Steric Structure of Tricarbonyl(5-phenyl-1,3-dioxane)chromium

According to the results of quantum-chemical calculations, the conformation of 5-phenyl-1,3-dioxane changes upon complex formation with tricarbonylchromium. The most favorable conformation in the complex is chair with the axial phenyl group oriented along the symmetry plane of the dioxane ring. The tricarbonylchromium fragment is located above the benzene ring plane. The calculated spin-spin coupling constants suggest presence in solution of a mixture of conformers, that with the axial substituent prevailing

Contributions of localized MO's to the magnetic shielding constants of protons in YPX3 molecules

1. Calculations of the magnetic shielding constants of the protons in the O=PMe3 and S=PMe3 molecules have been carried out. 2. The decisive contribution to the shielding of a proton is made by the C-H bond itself, and it is transferred fairly completely from one molecule to another. 3. Diagrams of the isoshielding lines of the P-O and P-C bonds have been calculated, and they can be used for the analysis of the chemical shifts caused by the influence of these bonds in systems with similar environments for the phosphorus atom. © 1986 Plenum Publishing Corporation

LOGISTICS SYSTEM IN TOURISM: FEATURES, FUNCTIONS AND OPPORTUNITIES

The article emphasizes the importance of logistics in promoting tourism. The structure of the logistics system and the main functions of the logistics activity in tourism are presented. Opportunities for the introduction and effective use of logistics technologies in tourism are also presented

Lie symmetries of systems of second-order linear ordinary differential equations with constant coefficients

Lie symmetries of systems of second-order linear ordinary differential equations with constant coefficients are exhaustively described over both the complex and real fields. The exact lower and upper bounds for the dimensions of the maximal Lie invariance algebras possessed by such systems are obtained using an effective algebraic approach

Proposal for a Listening Comprehension Oriented Classroom -With focus on interpretation practise-

© 2016 American Chemical Society.Interaction of 4,5-dimethyl-2-(2-oxo-1,2-diphenyl)ethoxy-1,3,2-dioxaphospholane, bearing a carboxyl group in the γ-position with respect to the phosphorus atom and obtained from d,l-butanediol, with hexafluoroacetone (CCl4, -40 °C) leads to the simultaneous formation of regio- and stereoisomeric cage-like phosphoranes with phosphorus-carbon and phosphorus-oxygen bonds with a high stereoselectivity (>95%), whose structure was determined by 1D and 2D NMR spectroscopy and XRD. When stored as a solution in dichloromethane for one month, the PCO-isomer rearranges into the thermodynamically more stable POC-isomer of the cage-like phosphorane. Mild hydrolysis of the PCO/POC-isomers proceeds with a high chemoselectivity and leads to the formation of P(IV)-dioxaphospholane derivatives. Acidic hydrolysis of the POC-isomer leads to the formation of an oxirane derivative with an unexpectedly high stereoselectivity (>95%). DFT calculations (using the PBE functional) allowed us to obtain structures and energies of the initial phospholane, reaction products (PCO/POC-isomers), and an intermediate P(V)-oxaphosphirane