ETL process (Extracting, Transforming, Loading) is responsible for extracting data from heterogeneous sources, transforming and finally loading them into a data warehouse. New technologies, particularly Internet and Web 2.0, generating data at an increasing rate, put the information systems (IS) face to the challenge of Big Data. These data are characterized by, in addition to their excessive s...

BACKGROUND Acute cartilage injuries induce cell death and are associated with an increased incidence of osteoarthritis development later in life. The objective of this study was to investigate the effect of posttraumatic cyclic compressive loading on chondrocyte viability and apoptosis in porcine articular cartilage plugs. HYPOTHESIS Compressive loading of acutely injured cartilage can mainta...

Liming Xu Hareesh V. Tippur Carl-Ernst Rousseau Auburn University Department of Mechanical Engineering Auburn, Alabama 36849 Abstract. The optical method coherent gradient sensing, a real-time lateral shearing interferometry, is proposed for measuring contact stress fields under static and dynamic loading conditions. Feasibility of the method is first established under quasi-static conditions. ...

In this paper, we report on an experimental study of the deflection/penetration behavior of dynamic mode-I cracks propagating at two different crack velocities (slower and faster) toward inclined weak interfaces of three dissimilar angles (a): 30 , 45 and 60 . A simple wedge-loading specimen configuration as proposed by Xu et al. [Xu LR, Huang YY, Rosakis AJ. Dynamic crack deflection and penetr...

The STEREO/WAVES instrument has detected a very large number of intense voltage pulses. We suggest that these events are produced by impact ionisation of nanoparticles striking the spacecraft at a velocity of the order of magnitude of the solar wind speed. Nanoparticles, which are half-way between micron-sized dust and atomic ions, have such a large charge-to-mass ratio that the electric field ...

Head injuries are the most common injuries sustained by children in motor vehicle crashes. Prevention of these injuries through advances in vehicles and restraint systems requires a biofidelic anthropomorphic test device (ATD). Pediatric ATDs are primarily developed from scaling down adult volunteer and cadaver impact test data. Limited experimental data exist on pediatric head and neck kinemat...

The primary objective is establishing tangible experimental methods and data analyzing methods in order to grasp various phenomena, which were the behavior of ejecta and projectile, the penetration depth and speed of projectile, fractured grains and the pressure distribution, induced by high-speed impact of projectile on sand. The plate impact experiments were conducted using vertical powder gu...