The sealing performance of end fittings is very important for offshore oil and gas pipelines. To investigate the sealing behavior of a ring-shaped wedge seal, global and local numerical models of the ring–pipe interaction have been developed based on the finite-element method. First, the sealing process of the ring under pressure is simulated. Second, a criterion for the penetration of fluid pr...

In this paper a general analytical solution is obtained to find stress distribution in a finite elastic plate with a circular or square hole subjected to arbitrary biaxial partial loading using modified boundary condition by assuming plane stress conditions. The method employed is based on solution of circular hole in finite rectangular plate. This plate is mapped to circular ones and the parti...

A new lifetime distribution is proposed and its properties are studied. The density function has a heavy right skew tails with different shapes. failure rate can be “constant”, “bathtub (U)”, “increasing-constant”, “decreasing-constant”, “upside down” down-U”. Complexity of the most integrals related to statistical solved numerically analyzed. Simple type copula presented. Numerical calculation...

This thesis examines the philosophical background that culminates in the Austrian School of economics' theories of capital and interest. In chapter two, I describe the character of the school, its history, and the educational, environmental and social background of the main authorities. The school is characterised by an adherence to Carl Menger's doctrines, with Eugen von Böhm-Bawerk, Friedrich...

We propose a new family of symmetric unimodal distributions on the circle which contains the uniform, von Mises, cardioid and wrapped Cauchy distributions, amongst others, as special cases. The basic form of the densities of this family is very simple, although its normalisation constant involves an associated Legendre function. The family of distributions can also be derived by conditioning an...

This paper presents numerical analysis result of forming characteristics of Ta explosively formed penetrator (EFP) according to various material models and their values. Dynamic material properties of Ta were measured with static tensile testing machine and Hopkinson pressure bar tests. We used AUTODYN hydrodynamic code to simulate these phenomena. We used three material models, such as Von-Mis...

In this paper, the complex 3D virtual model of the prosthetic knee is obtained using embedded applications: DesignModeler and SpaceClaim under ANSYS Workbench 14.5 software package. A number of six cases of prosthetic knee joint assembly, depending on the malalignment angle, are developed. Stress maps and the values of the maximum von Mises stress on the three prosthesis components: polyethylen...

Two wheelchairs, one manual, one electrically powered, were instrumented with strain gages and operated over various laboratory terrains. Both wheelchairs were folding models with cross tubes pinned together at the center. The wheelchairs were operated on a constant speed treadmill with no bump, and with 0.953 cm (0.375 in) and 1.6 cm (0.625 in) dowels simulating bumps. The wheelchairs were als...

This paper proposes general speci...cation tests for the martingale hypothesis. They can be used to test the null hypothesis that a given time series is a martingale process, against the alternative hypothesis that it is a stationary ergodic nonmartingale process. We consider tests of two di¤erent types: one is a generalized Kolmogorov-Smirnov test and the other is a Cramer-von Mises type test....