In this paper, based on Darcy equations that govern the lubricant in porous layers, and the modified Reynolds equation in the framework of a short bearing solve the problem of unsteady motion of a viscous incompressible lubricant in the bearing clearance double-layer porous. Here we consider the case when the permeability in porous layers in the axial direction is changed by the normal law, and the combined feed lubrication is performed simultaneously in the axial and perpendicular to the bearing axis directions. As a result, the pressure field found in porous layers and in the lubricating layer and analytical dependences for the efforts of the oil film. Compiled by the equation of motion tongue and solved the problem of the stability of the unsteady motion of a pin bearing, found that in the case of a combined bearing lubrication working more steadily compared with the cases or axial directions perpendicular to the axis lubrication. The results obtained can be offered for the development of cylindrical dampers with double-layer porous collar, effectively attenuating transmitted force imbalance in the combined feed lubrication.
The calculated model of a thrust bearing with a guide surface of the porous layer is given on the basis of linear non-stationary equations of Navier-Stokes and Darcy equation. The field of speeds and the field of pressures in lubricant and porous layers are found. Subsequently analytical dependencies for the basic operating characteristics of the bearing were received. As a result the problem of stability was solved on the basis of the equation of guide movement.
In today's world a term "ecological architecture" is defined not only by standards that aim to prevent negative impact from environment to a human being, but also by standards that aim to minimize human impact on the environment. In traditional Japanese architecture the three core elements — human being, building and nature—are not opposed to each other, but coexist in a constant dialogue.
This paper is aims to describe a new attitude emerging in contemporary Japanese architecture, which combine experience and perspective of the past with the present innovations. Projects of Taira Nishizawa Architects, SUEP. (Yoko and Hirokazu Suemitsu) and DESIGN NEUOB (Hiroshi Ota and Toru Kashihara) are examined.
The article describes the impact of macroeconomic environment on the demand for passenger air transportation in Russia, The thesis on the limited impact of the dynamics of GDP growth on air transportation in 2012-2014 has been validated. The article contains an analysis of the impact on consumer demand of a number of other macroeconomic indicators, in particular, the dynamics of wages and exchange rates. The mutual influence of passenger traffic with substitutes (long distance railways) has been established
Non-stationary model of a two-layer porous bearing of finite length with combined supply of lubricant is considered.
The article examines the changes in the U.S. upstream gas industry from the perspective of asset specificity and characteristics of human capital. The authors show that nowadays the development of shale gas production, as well as the expansion of production and sales of liquefied natural gas are associated with changes in the asset characteristics (both tangible and intangible). The latter is increasingly acquiring the features of universality. Among the characteristics of such changes is the reduction in contract duration, and changing directions of natural gas supply (including outside the United States). Furthermore, the ratio of costs changes dramatically: while for the traditional fields capital costs, associated with well construction, dominate over operational costs, associated with well exploitation and maintenance, shale fields are characterised by an invert correlation. In addition, the essential role is now played not by field/well characteristics, but by the level of competencies and the technological development. Hence, the share of employees in the service sector keeps increasing. The authors substantiate that the “shale” assets are generally less specific than the “traditional” ones. The transformation of specificity, along with the increase in the number of transactions, lead to the proliferation of the number of service companies and local operators at all the stages. These companies tend to minimise costs and maximise efficiency, consequently (alongside with several other reasons, mentioned in the article) leading to lower gas prices in the U.S.A. and creating an opportunity for gas export.
The law-enforcement practice allowing application of public aircraft for rendering aviation services is critically estimated in article. The possibility of lawful rendering aviation services only with application of civil aviation is proved. The attention that both the private and the state organization can be the operator of civil aviation is paid.
Moments of inertia for some bodies are found without using the tools of calculus.
The problem of planar oscillations of a pendulum with variable length suspended on the Moon’s surface is considered. It is assumed that the Earth and Moon (or, in the general case, a planet and its satellite, or an asteroid and a spacecraft) revolve around the common center of mass in unperturbed elliptical Keplerian orbits. We discuss how the change in length of a pendulum can be used to compensate its oscillations. We wrote equations of motion, indicated a rule for the change in length of a pendulum, at which it has equilibrium positions relative to the coordinate system rotating together with the Moon and Earth. We study the necessary conditions for the stability of these motions. Chaotic dynamics of the pendulum is studied numerically and analytically.