In this study, stress and displacement functions of the three-dimensional theory of elasticity for homogeneous isotropic bodies are derived from first principles from the differential equations of equilibrium, the generalized stress – strain laws and the geometric relations of strain and displacement. It is found that the stress and displacement functions must be biharmonic functions. The deriv...

Based on the expressions for the surface displacements due to concentrated vertical and tangential forces acting on the free surface of a half-space, available from the well-known Boussinesq and Cerruti elasticity problems, the surface displacements and the surface stresses are derived for a half-space loaded by the vertical and tangential circular ring loads, or by uniform normal and radial sh...

This paper proposes a new scalable service-oriented architecture based on Open Service Gateway Initiative (OSGI) technology. A key part of this architecture is its SIP application as a service (SIP-AS). It relies on IMS core network supported by multi agents components implemented using Java Agent DEvelopment (JADE) platform. As a proof of concept, a real testbed/prototype has been developed to...

In this paper, four different nondestructive testing (NDT) methods and static bending tests were done on poplar (Populus ussuriensis Kom.) and birch (Betula platyphylla Suk.) Laminated Veneer Lumber (LVL). The effects of compression ratio on the modulus of elasticity (MOE) and modulus of rupture (MOR) of LVL with vertical load and parallel load were investigated. There were four compression rat...

Mechanical properties of self-scrolling binormal nanohelices with a rectangular cross-section are investigated under uniaxial tensile and compressive loads using nanorobotic manipulation and Cosserat curve theory. Stretching experiments demonstrate that small-pitch nanohelices have an exceptionally large linear elasticity region and excellent mechanical stability, which are attributed to their ...

Failure in materials under cyclic loading occurs by the growth and propagation of cracks. If they are sufficiently numerous, the cracks can be considered to be continuously distributed in the material. In this paper, a mathematical model is proposed to predict failure in materials with defects in the form of randomly distributed pores. The model includes anisotropic damage accumulation, the eff...

Any scalable stream data processing engine must handle the dynamic nature of data streams and it must quickly react to every fluctuation in the data rate. Many systems successfully address data rate spikes through resource elasticity and dynamic load balancing. The main challenge is the presence of stateful operators because their internal, mutable state must be scaled out while assuring fault-...

Web services (WS) are going mobile. A Mobile Enterprise can be established in a cellular network by participating Mobile Hosts, which act as WS providers, and their clients. Mobile Hosts enable seamless integration of userspecific services to the enterprise, by following WS standards, also on the radio. The paper summarizes the challenges and research associated with establishing Mobile Enterpr...

Computational algorithm for the solution of 2D and 3D dynamic problems of the Cosserat elasticity theory using multiprocessor computer systems is worked out. The algorithm is based on the two-cyclic splitting method with respect to the spatial variables in combination with the explicit monotone finite-difference ENO–scheme for solving 1D problems adapted for the calculation of discontinuities. ...

Hybrid stepper motors (HSMs) are commonly used in many cost-sensitive industrial and consumer applications. With the use of micro-stepping techniques, they could theoretically achieve a very high resolution in positioning of mechanical loads, even without position sensors. However, it is well known that HSMs are affected by a large torque ripple, due to cogging and phase unbalancing. This, in t...