The operating environment of mechanical equipment is complex, and it in high-intensity working conditions for a long time. condition monitoring fault diagnosis are very important. As kind precision part commonly used equipment, the healthy operation rolling bearing necessary to ensure reliable whole equipment. This research takes as object devoted analysis system design. paper studies structure...

Digital platforms, such as Alibaba and Amazon, operate an online marketplace to facilitate transactions. This paper studies a platform’s business model choice between accepting cash issuing tokens, well the implications for welfare, resiliency, interoperability. A platform free rides on existing payment infrastructure profits from collecting transaction fees. token earns seigniorage, albeit bear...

air spindles are one of the main elements of precise machine tools. vibration of these spindles is one of the vital issues necessary for investigation. among parameters which influence air spindle vibrations are rotational speed, compression air method, input nozzle diameter, air gap pressure. in this study using ansys, the effects of air gap thickness on air spindle vibrations have been invest...

in this paper the problem on “magnetic fluid lubrication of porous-pivoted slider bearing with slip velocity by n ahmad et.al.[7]” has been recapitulated using jenkin’s model [4] with the additional effect of squeeze velocity of the above plate. it is found that while discussing the above problem, [7] has stated but ignored the term , where +, in their study (refer equation(2.2)). this paper re...

A review of the theoretical properties of the GMM with a continuum of moment conditions is presented. Numerical methods for its implementation are discussed. A simulation study based on the stable distribution and an empirical application based on the autoregressive variance Gamma model are performed. Using the Alcoa price data, the …ndings suggest that investors require a positive premium for ...

ISK is a characteristic of existence. Attempts to avoid it explain such arrangements as insurance, limited liability firms and diversification of investment portfolios. In recent years, risk aversion and the attendant premium for risk-bearing have been used increasingly to explain a stubborn paradox in the empirical exchange rate literature: the failure of the forward exchange rate to he an unb...

This paper considers the general equilibrium and welfare effects of a linear progressive income tax with entrepreneurship and moral hazard. A competitive intermediation sector diversifies risk associated with entrepreneurial activity, but full risk consolidation is prevented by moral hazard. Since effort is not observable, risk bearing of entrepreneurs is required for incentive reasons. The ext...

Weak and osteoporotic bones in old age are an increasing cause of mortality and painful physical impairment of the elderly, especially in the western world. Bone mineral accrual during childhood and adolescence is thought to play a vital role in preventing osteoporosis. Identifying and optimizing the factors influencing peak bone mass is thus important for the prevention of osteoporosis and rel...

A finite element program based on elastic –plastic model of Mohr-Coulomb criterion was used to evaluate the bearing capacity coefficients of soil under shallow strip flexible footing . The results were compared with others’ analytical results and it was found that the present study could offer quite consistent and rather precise values for the bearing capacity coefficients . The effect of d...