Learning geometry can be significantly improved if the student interacts with shapes and their transformations. We present the design and validation of a robotic system that teaches geometry by natural interaction. The robot is able to draw arbitrary shapes in the environment by means of its own movement. It is also able to detect and track the student movements, representing them as geometrica...

The generation of design parameter sensitivity derivatives is required for gradient-based optimization. Such sensitivity derivatives are elusive at best when working with geometry defined within the solid modeling context of Computer-Aided Design (CAD) systems. Solid modeling CAD systems are often proprietary and always complex, thereby necessitating ad hoc procedures to infer parameter sensiti...

High speed trains are an indispensable part of rapid transportation systems in many countries. As the fastest means of transport on the ground, these trains are extremely sensitive to the terrain and track conditions. Geometrical irregularities and mechanical characteristics of the track, together with inconsistencies in the lane (including bridges that support the track) are considered importa...

background: the aim of this study was to investigate vertebral geometry changes and determine cutoff value of vertebral height to predict fractures. methods: in a cross-sectional study, 280 postmenopausal women recruited .in all subjects bone mineral density and radiog raphy of the lumbar spine performed. lateral radiographs were evaluated for identification of vertebral fractures, using a vali...

• A novel lattice model to capture nonlinear ballast behaviour is developed The included in a 2D railway track with transition zone Ballast compaction on its own cannot cause progressive deterioration of the Locations tracks where significant variations properties occur are subject increased deterioration. To successfully mitigate this, mechanisms leading need be understood. this end, work pres...

The positioning accuracy achievable by track-follow servo for flexible tape media is investigated using advanced concepts for several elements of the system. First, the servo pattern geometry in the timing-based servo system is designed in conjunction with a digital synchronous servo channel to minimize the measurement error in the position-error signal. Second, a flangeless tape path is introd...

the subject of geometry and proportions has been regarded as an issue which has a close relationship with architecture. since the entire universe, living beings and the human geometry can be seen clearly, that’s why our unconscious essence has accustomed to these proportions whereby reflection of this mentality can be seen in the architect’s hands and thought in the architecture. it can witness...

The results of the railway track quality assessment, obtained as part diagnostics during its operational phase, are used by construction manager to plan repair activities. aim infrastructure is maintain longest possible good condition structure, most often represented a stable geometry quality. In case low economic efficiency assurance structure through improvement diagnosed parameters, accordi...

Laser directed energy deposition (LDED) can be deployed for depositing high-performance materials various engineering applications. Alumina-forming steel is a material that possesses excellent corrosion and oxidation resistance, finding application in the power generation sector. In present work, LDED using powder feeding (LDED-PF) was used to deposit Fe20Cr5.5AlY alloy single-track, multi-trac...