Résultats de la recherche - V. S. Efimov

In article the main problems provoking emergence of crises in world economy are considered. The factors exerting impact on cyclic development and providing impossibility to avoid crises are systematized, historical prerequisites of emergence of crises are revealed. Examples of the solution of the st...

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The university is considered in historical retrospect and perspective as a cognitive institution of society that ensures the reproduction and development of thinking. The concept of “university generation” is basic for the study. Three generations of universities are distinguished in history (schola...

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A mathematical model of the specific fuel consumption of the TV3-117 based thermogasdynamic calculation that takes account of the design of engine parts.

In this paper, the object of research is the icing of aircraft surfaces during flight in the atmosphere. On many light aircraft, as well as on unmanned aircraft weighing less than 30 kg, there are no on-board de-icing systems. Nevertheless, aviation events occur with these aircraft, which are a cons...

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When a helicopter performs an air operation and aerial work using external sling there may occur special situations, as the result of unfavourable conditions impact. The most difficult and dangerous stages of flight are the takeoff and landing.To study an aircraft flight dynamics in extreme flight c...

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Aircraft are high-tech engineering products which are characterized by a wide range of properties including the two most important groups that respectively characterize the efficiency and technical level.Improving the aircraft efficiency is an essential factor for air transport development, but the...

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The first description of the complex of bones from one individual plesiosaur marine reptile from the Upper Cretaceous deposits of the Central Urals is done; the reptiles remains of different species encountered in these sediments so far. The new finding comes from the neighborhood of Kamensk-Uralsky...

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Justification of possibility of application of an OpenFOAM package for obtaining aerodynamic characteristics of bluff bodies and studying of their dependence on geometrical parameters.

When helicopters fly with suspended load, there may be a need for a load drop. This can be associated with both the abnormal situations in flight and with a regular load drop to a predetermined area. However, under certain conditions, after the external load drop, there may be significant changes in...

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An actual topic in higher education research today is the study of student experiences. It is believed that knowledge of educational settings, the degree of student involvement in educational and extracurricular activities, satisfaction with the quality of courses or practices offered, etc. helps to...

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During the long-term aircraft operation, corrosion damage occurs on the aircraft structure. This leads to reducing of construction strength, rigidity and durability. Due to this corrosion damage removal and paintwork restoration are performed during the maintenance operation. During the corrosion da...

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Functional properties characterize the purpose of the aircraft and are described by its flight performance characteristics such as range and cruising speed, payload, runway characteristics, etc. Functional properties also characterize the aircraft efficiency that determines the objective need for th...

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The results of the helicopter dynamics research after the discharge of cargo transported on the external sling. These results allows to specify the limits of safe modes of transportation and to develop recommendations for actions in particular situations associated with discharge of the cargo are pr...

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One way to study the variability of biologic objects is their geometrization: the objects are presented by points in a multidimensional space in such a way that the distances between the points would be best consistent with the dissimilarities between objects. If the dissimilarities between the obje...

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Climate change is the key challenge to agriculture in the XXI century. Future agricultural techniques in the Russian Federation should involve the optimization of land utilization. This optimization should apply algorithms for smart farming and take into consideration possible climate variations.  D...

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This article is aimed at finding the causes of controllability variations of a helicopter while transporting sling load.The maximum angular acceleration taken by the helicopter at similar controller displacement at different flight speeds was taken as a quantity characteristic of controllability eff...

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In the 1940s, Karhunen and Loève proposed a method for processing a one-dimensional numeric time series by converting it into multidimensional by shifts. In fact, a one-dimensional number series was decomposed into several orthogonal time series. This method has many times been independently develop...

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A new Euclidean distance based algorithm is used for analysis of congruence and combining molecular genetic data. This approach is called geometric, since Euclidean distance satisfies all metric axioms and the points representing the sequences can be placed in a geometric space without distorting th...

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During the operation of single-rotor helicopters, aviation accidents quite frequently occur in the form of an unintentional turn or even a yaw rotation, causing, as a rule, a ground collision. Numerous researchers of this problem consider the loss of helicopter tail-rotor effectiveness due to wind e...

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The article considers the adequacy of a mathematical model of Mi-8MTV helicopter dynamics with an external load in terms of controllability, based on comparison of data obtained from computational experiments and flight testing. The results of evaluation of the Mi-8MTV helicopter mathematical model...

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