List of publications on a keyword: «correlation»

A theoretical estimate of the dependence of ultimate strength on the physical properties of a solid substance—such as density, molecular weight, melting point, and enthalpy of fusion—has been obtained. This dependence explains how these properties influence the material’s strength based on the “unpacking” concept of substance matter. The physical limits of applicability for the concept of “force” in Newtonian mechanics, and its distinction from the “unpacking” concept, are substantiated. This dependence, while similar in form to the Clapeyron-Mendeleev equation for an ideal gas, has a different physical interpretation when applied to the ultimate strength of a solid. The calculated dependence was compared with tabulated data on the ultimate strength of 15 industrial metals. This model allows for the explanation and prediction of ultimate strength values for metals in the periodic table.

This article brings together previously published evidence of the unified nature of physical processes and phenomena in terms of changes in the energy of a substance molecule. The unified physical nature of all these physical phenomena has been proven, as a single multistage process of energetic unpacking of molecules of a substance, which is logical to call the molecular-energy concept of unpacking a substance. The considered processes include the following processes. Surface rupture, characterized by the surface tension coefficient. The melting process of a substance characterized by its melting point. A boiling process characterized by the boiling point. Evaporation (and condensation) process characterized by internal energy and enthalpy as well as critical point. The conclusions of the theory are confirmed by well-known empirical dependences and by reference books of the physical properties of simple substances: internal energy, enthalpy, surface tension, melting point, boiling point and critical point.

Based on the physical model of «unpacking» a fluid, published in 1983 to explain the physical nature of surface tension, an explanation of capillary phenomena was proposed. The unified physical nature of the condensation process and the processes in the capillaries expressed in terms of the surface tension of the liquid is proved. To prove the applicability of the «unpacking» model for capillary phenomena, an empirical Borelli-Jurin formula for determining the height of fluid lifting in capillaries was theoretically derived depending on the magnitude of the surface tension. The assumptions under which the formula is obtained are indicated. In addition, the article proposes a new formula for determining the maximum height of liquid lift in the capillaries, depending on the critical temperature of the liquid and the molecular weight of the liquid.

According to the properties of melting points and boiling points of the elements of the periodic table of D.I. Mendeleyev the application of the unpacking hypothesis of the substance was verified. The article contains the results of the verification. In general, according to the data for 98 substances taken from the information in Internet, convergence of results with an error of up to 40% for 73 substances was obtained. The effect of periodicity on the result is found. An exception to the calculated dependences was obtained for ten substances: noble gas and most halogens. A large discrepancy between the theoretical formulas and the reference data was also caused by the 14 elements of the middle groups.

According to the authors, foreign direct investments have a significant role in the economic development of each country. The analysis revealed that 34.3% change in export growth in Armenia and 13.7% in the world is conducted by FDI growth. This fact shows that Armenian export is more related to the FDI changes. Therefore, unlike global data, FDI growth in RA leads to decrease of export growth. This should be a signal for RA Government to implement a more effective policy for attracting foreign investments, leading the investors to the sectors, which have a comparative or competitive advantages in the foreign market.

The article discusses the method of evaluation of employee engagement in terms of a nonparametric estimate of the object. Methods for assessing the involvement of Q12 (Gallup) and Scriptunova E.A. were studied, which are difficult to consider universal and apply to all organizations without distinction. Therefore, to assess the personnel of the units in each organization, its own specific methodology for assessing engagement is needed.

The paper examines approaches to the estimation of intergenerational correlations of earnings and education. Reasons for the existence of the correlation between characteristics of parents and children are stated. Restrictions for the application of the concept of credit constraints to explain intergenerational correlations are discussed. Approaches to identifying the causal effects of parental income and education on children’s ones are reviewed.

Competent statistical processing of data - an integral part of modern medical science and practice. The author examines the process of identifying the correlation between the values that have biomedical significance.

The article focuses on the empirical study of students' behavior in social networks; the study was conducted by statistical data analysis methods obtained by interviewing students.

Assess the interdependence of the method of pair correlation between blood biochemical parameters of boxers of high qualification and efficiency of competitive activity. A strong correlation metrics from testosterone, urea, lactate, and iron.

В статье проводится анализ внутренних и внешних по отношению к российской экономике факторов, оказывающих влияние на динамику объемов экспорта сырой нефти из России. Предлагается эконометрическая модель, описывающая влияние неценовых внутренних факторов на физический объем экспорта российской сырой нефти; сделаны выводы о перспективах экспортных поставок сырой нефти из России в условиях ценового давления и ограничительных санкций со стороны стран Евросоюза.

This article discusses one method of cash flow management companies – their prediction on the basis of the trend model. Cash Flow Forecasting provides the ability to save the daily solvency of the enterprise, to extract additional profit at the expense of emerging investment of temporarily free financial resources.

The article reveals the essence and the practical value of multivariate correlation and regression analysis. The study reveals the aims and objectives of this method, as well as the interconnections of the basic factors, studuied through the example and established by means of correlation and regression analysis on which the conclusions are based. The main objective was defined as accurate and objective managerial decision making.