This work presents a re-derivation of relative Jacobian matrix for parallel manipulators, expressed in terms of the individual manipulator Jacobians and multiplied by their corresponding transformation matrices. This is particularly useful when the individual manipulator Jacobians are given, such that one would not need to derive an entirely new expression of a relative Jacobian but will only u...

Housing is a flash point in many European countries, with protests erupting and citizens voting to wrench properties from big investors. Inequality driving the explosive debate, as households across income distribution face very different kinds of challenges opportunities today’s unequal housing markets. The COVID-19 pandemic has amplified risks rewards already present subgroups. This housing-g...

aAssociate Professor, Department of Clinical Sciences, School of Dental Medicine, University of Nevada Las Vegas. bProfessor, Restorative and Prosthetic Dentistry, College of Dentistry, The Ohio State University, Columbus, Ohio. (J Prosthet Dent 2012;108:401-403) 1 Instrument kit with available inserts, from left to right: 0.050in. hexagon straight (Zimmer part # HX1.25D), 0.048-in. 24 mmL hex ...

Hands have many joints in comparison with other parts of the human body. In the motor area of cerebral cortices related directly to sensation and movement, the area related to hands occupies a large part. This implies that dexterity of hands contributes to the development of the human brain. By virtue of the dexterity, hands have evolved to make tools and write pictures and characters. Especial...

David Wrench, Rachel Waters, Emanuela Carlotti, Sameena Iqbal, Janet Matthews, Marie Calaminici, John Gribben, T Andrew Lister, Jude Fitzgibbon Centre for Medical Oncology, Barts and the London School of Medicine, London, UK; Centre for Statistics in Medicine, University of Oxford, Oxford, UK; Data Management Unit, Medical Oncology Department, Barts and the London NHS Trust, London, UK; Histopa...

In the literature, conventional 3D inverse dynamic models are limited in three aspects related to inverse dynamic notation, body segment parameters and kinematic formalism. First, conventional notation yields separate computations of the forces and moments with successive coordinate system transformations. Secondly, the way conventional body segment parameters are defined is based on the assump...

The recent advent of angular optical trapping techniques has allowed for rotational control and direct torque measurement on biological substrates. Here we present a method that increases the versatility and flexibility of these techniques. We demonstrate that a single beam with a rapidly rotating linear polarization can be utilized to apply a constant controllable torque to a trapped particle ...

This paper presents a screw theory based approach for the analysis and synthesis of flexible joints using wire and sheet flexures. The focus is on designing flexure systems that have a simple geometry, i.e., a parallel constraint pattern. We provide a systematic formulation of the constraint-based approach, which has been mainly developed by precision engineering experts in designing precision ...

Introduction: Some clinicians use a handheld screw driver instead of a torque wrench to definitively tighten abutment screws. The aim of this study was to compare the removal torque of one-piece and two-piece abutments tightened with a handheld driver and a torque control ratchet. Methods: 40 ITI implants were placed in acrylic blocks and divided into 4 groups. In groups one and two, 10 ITI one...