This article presents a performance measure, the actuation eficiency, which describes the imbalance between the end-effector accelerations achievable in different directions of non-redundant robotic manipulators. A key feature of the proposed measure is that in its development the unitam differences between linear and angular accelerations are treated in a physically meaningful manner. The memu...

Abstract The MICROSCOPE mission aimed to test the weak equivalence principle (WEP) a precision of 10 −15 . WEP states that two bodies fall at same rate on gravitational field independently their mass or composition. In MICROSCOPE, masses different compositions (titanium and platinum alloys) are placed quasi-circular trajectory around Earth. They test-masses double accelerometer. measurement acc...

OBJECTIVES To examine the validity and inter-unit reliability of 10 Hz GPS for measuring instantaneous velocity during maximal accelerations. DESIGN Experimental. METHODS Two 10 Hz GPS devices secured to a sliding platform mounted on a custom built monorail were towed whilst sprinting maximally over 10 m. Displacement of GPS devices was measured using a laser sampling at 2000 Hz, from which...

The goals of this study were to determine if the muscle contributions to vertical and fore-aft acceleration of the mass center differ between crouch gait and unimpaired gait and if these muscle contributions change with crouch severity. Examining muscle contributions to mass center acceleration provides insight into the roles of individual muscles during gait and can provide guidance for treatm...

Purpose: Predicting body Center of Mass (COM) acceleration is carried out with more accuracy based on the acceleration of three joints of lower limb compared to only accounting joints of hip and ankle. Given that trunk movement during quite standing is noticeable, calculating trunk acceleration in model might increase prediction accuracy of COM acceleration. Moreover, in previous research studi...

In this short note, we try to clarify a seemly trivial but often confusing question in relating a higher-dimensional physical gravitational constant to its lower-dimensional correspondence in Kaluza-Klein reduction. In particular, we re-derive the low-energy M-theory gravitational constant in terms of type IIA string coupling gs and constant α ′ through the metric relation between the two theor...

We consider multidimensional gravity with a Lagrangian containing the Ricci tensor squared and the Kretschmann invariant. In a Kaluza-Klein approach with a single compact extra space of arbitrary dimension, with the aid of a slow-change approximation (as compared with the Planck scale), we build a class of spatially flat cosmological models in which both the observed scale factor a(τ) and the e...

In this paper we explore the possibility of suitably combining the nodes Ω of the existing geodetic LAGEOS, LAGEOS II and Ajisai SLR satellites and of the radar altimeter Jason–1 satellite in order to increase, hopefully, the accuracy in testing the general relativistic gravitomagnetic Lense–Thirring effect in the gravitational field of the Earth. The proposal of introducing Jason–1 in such a c...

In this paper we show that by suitably combining the nodes Ω of the existing geodetic LAGEOS, LAGEOS II and Ajisai SLR satellites and of the radar altimeter Jason–1 satellite it would be possible to measure the general relativistic gravitomagnetic Lense–Thirring effect in the gravitational field of the Earth with a high accuracy and reliability. The proposal of introducing Jason–1 in such a com...