Each managing subject tries to lower level of risk factors for himself for the purpose of increase of efficiency of activity. One of options of minimization of losses and decrease in action of risk factors is the diversification consisting of distribution of means between various activities so that losses just seeing activity can be compensated by profit on other kind of activity of the managing subject.
In article the diversification of economic activity connected with use by construction company of new production and marketing capabilities for the purpose of increase of efficiency of economic activity is considered.
The decision on diversification as a way of decrease in risk of activity of the enterprise is accepted on the basis of correlation coefficient which shows degree of expressiveness of a tendency to changes of size of one variable at changes another. At value of coefficient of the correlation, equal to zero, lack of communication between variables is observed. If numerical value of coefficient of correlation is equal to unit, variables are connected by direct functional link, that is there are unidirectional changes of variables. At value of coefficient of the correlation, equal the minus to unit, between variables is observed the return functional communication testifying to a raznonapravlennost of change of variables. At value of coefficient of the correlation, equal or close a minus to unit, it is expedient to make the decision on carrying out diversification.
The reasonable model of optimization of a choice of the customer is offered mathematically.  

Keywords: risk, enterprise, diversification, benefit, parameters, correlation, model

The article highlights the conditions for effective diversification. The factors of the internal environment, affecting the efficiency of diversification. 
The methods of analysis of the market, allowing you to tailor a strategy of diversification to the changing conditions of competition in the market. 
Shows the need for structuring diversification, given the group on current issues, as well as a comprehensive solution to these problems, we have an in-depth analysis and diagnosis with the subsequent implementation on the basis of this analysis in the operation of the enterprise. 
There are four stages of diversification of copyright: in the first step to solve the problem of selecting priority areas for development within the economic entity, the second stage is the process of structuring a problem specific to the business entity; the third stage should be determined by the direction of the use of innovative resources as the main form for priority directions ongoing diversification; fourth phase to establish mechanisms for the implementation of diversification at the business entity.  

Keywords: diversification, enterprise, efficiency, factors, criteria, stages

The simulation of two-dimensional spherical crystals consisting of a large number of particles is carried out. These shells were analyzed based on their geometric structure and energy distribution. Various types of defects formed in a state of equilibrium  is considered. Being shown the ambiguity of the existing method of their interpretation. A new way of describing such defects in the close-packed two-dimensional crystals with different topology is suggested.  

Keywords: topological defects, two-dimensional materials, spherical crystals, topological charge

`

Keywords: