...................................................................................................................... vi LIST OF TABLES ............................................................................................................. ix INTRODUCTION ...............................................................................................................1 MENA REGION PRE-ARAB ...

Abstract A numerical solution is presented to describe wave propagations in axially impacted helical springs. The governing equations for such problem are two coupled hyperbolic, partial differential equations of second order. The axial and rotational strains and velocities are considered as principal dependent variables. Since the governing equations are non-linear, the solution of the system ...

•Unique axial-to-axial chirality transfer for C–N axial construction•Ability to assemble two vicinal and remote stereogenic axes•Step-economic scalable synthesis of enantioenriched phenanthridinones•Broad scope, good yields, excellent enantioselectivities Axial widely exists in bioactive natural products, pharmaceuticals, chiral materials, ligands catalysts asymmetric catalysis. As such, the ef...

A fiber Bragg grating (FBG) accelerometer using transverse forces is more sensitive than one using axial forces with the same mass of the inertial object, because a barely stretched FBG fixed at its two ends is much more sensitive to transverse forces than axial ones. The spring-mass theory, with the assumption that the axial force changes little during the vibration, cannot accurately predict ...

Abstract High-performance Nb 3 Sn superconducting wires have become one of the key technologies for development next generation accelerator magnets. While their large critical current densities enable design compact accelerator-quality magnets operation above 10 T, noticeable reduction conductor performance due to mechanical strain appears as a new essential characteristic in magnet design. In ...

Sudden application of load along a sagittal or coronal axis has been used to study trunk stiffness, but not axial (vertical) load. This study introduces a new method for sudden-release axial load perturbation. Prima facie validity was supported by comparison with standard mechanical systems. We report the response of the human body to axial perturbation in sitting and standing and within-day re...