Stress and Strain State Analysis of Defective Pipeline Portion

The paper presents computer simulation results of the pipeline having defects in a welded joint. Autodesk Inventor software is used for simulation of the stress and strain state of the pipeline. Places of the possible failure and stress concentrators are predicted on the defective portion of the pipeline

Solving Stiff Systems of ODEs by Explicit Methods with Conformed Stability Domains

The Cauchy problem for a stiff system of ODEs is considered. The explicit m-stage first order methods of the Runge-Kutta type are designed with stability domains of intermediate numerical schemes conformed with the stability domain of the basic scheme. Inequalities for accuracy and stability control are obtained. A numerical algorithm based on the first-order method and the five-stage fourth order Merson method is developed. The algorithm is aimed at solving large-scale systems of ODEs of moderate stiffness with low accuracy. It has been included in the library of solvers of the ISMA simulation environment. Numerical results showing growth of the efficiency are given

ENERGY AND ECOLOGICAL SECURITY OF AGRICULTURE TOMSK REGION FROM EMERGENCY SITUATIONS OF NATURAL CHARACTER

В статье представлены результаты расчета экономического ущерба, который понесли отрасли сельского хозяйства Томской области в результате стихийных бедствий. Полученные данные с использованием методики Международного Университета природы, общества и человека «Дубна» авторы перевели в единицы мощности – устойчивые во времени единицы. Эти данные позволят проанализировать энергоэкологическую безопасность сельского хозяйства региона, его устойчивость к стихийным бедствиям.The article presents results of the calculation of economic damage suffered by the agricultural sector of the Tomsk region due to natural disasters. The data obtained using the methodology of the International University of Nature, Society and Man «Dubna» the author translated into units of power – stable in time units. These data will allow analyze the energy and ecological security of agriculture in the region, its resistance to natural disasters