The inverse kinematics problem of a reclaimer which excavates and transports raw materials in a raw yard is investigated. Because of the geometric feature of the equipment of which scooping buckets are attached around a rotating disk, kinematic redundancy occurs in aktermining joint variables. Link coordinates are introduced following the Denavit-Hatenberg representation. For a given excavation...

Introduction: There has been a curiosity about the spheroid geometry for PET scanners developments since several years ago, therefore in this study, we are aiming to evaluate the performance of this geometry and compare its performance with cylindrical geometry using Monte Carlo simulation. Methods: We simulated a spheroid geometry with a radius of 199 mm...

recent developments in the area of smart structures indicate that variable geometry / stiffness truss network is of fundamental importance in designing smart transformable structures and systems for space applications. this paper presents the conceptual design and dynamic modeling of a cooperative re-configurabel dual-arm robotic structure called dual-arm cam-lock manipulator. the manipulator i...

This paper proposes a technique for the design of luminaire reflector shapes from prescribed optical properties (far-field radiance distribution), geometrical constraints and user’s knowledge. This is an important problem in the field of Lighting Engineering, more specifically for Luminaire Design. The reflector’s shape to be found is just a part of a set of pieces called in Lighting Engineerin...

Composites with subwavelength features exhibit effective properties that depend on microstructure morphology and materials, which can be adjusted to obtain enhanced characteristics. We detail the systematic design of electromagnetic metamaterials composed dielectric inclusions in a ferroelectric matrix that, under an applied voltage, present optimized tunability higher than bulk due nonlinear l...

la a rather aeaeral sense, ia"erse airfoU desila caa be takea to meaa the problem of speclfyinl a desired set of airfoU characteristics, sudl as tbe airfoU maxima .. tblekaess ratio, pltchlal moment, part of tbe "e1oclty distributioa, or bouadary-layer develop_t. From tills laformatloa, the correspoadinl airfoU shape is determiaed. This paper presents a metbod tbat approacha tbe desiga problem ...

in early islamic era, architecture in khorasan was followed the common features of early islamic architecture style; such as simplicity in construction and ornament. in the later periods, especially in seljuq dynasty, the application of brick, stucco, tiling and inscription had been used more in architectural ornament. then, in the short period under the khwarizmshahid dynasty in khorasan, two-...