Hingeless plastic ankle-foot orthoses (PAFOs) achieve ankle motion by flexing about the ankle joint. Instantaneous centers of rotation (ICRs) in dorsi- and plantarflexion movements, used as a measure of PAFO axes of movement, were measured to evaluate their fit to ankle motion. Thirty different PAFOs were fabricated and their stiffness modified in three stages. They were dorsi- and plantarflexe...

Despite extensive surveys of extragalactic TeV gamma-ray candidates only 3 sources have so far been detected. All three are northern hemisphere objects and all three are low-redshift X-ray selected BL Lacs (XBLs). In this paper we present the results of observations of the three nearest southern hemisphere XBLs (PKS0548−322, PKS2005−489 and PKS2155−304) with the CANGAROO 3.8m imaging telescope....

Yet each in itself – this was the uncanny, the antiorganic, the life-denying character of them all – each of them was absolutely symmetrical, icily regular in form. They were too regular, as substance adapted to life never was to this degree – the living principle shuddered at this perfect precision, found it deathly, the very marrow of death – Hans Castorp felt he understood now the reason why...

The complexity of hybrid organic perovskites calls for an innovative theoretical view that combines usually disconnected concepts in order to achieve a comprehensive picture: (i) the intended applications of this class of materials are currently in the realm of conventional semiconductors, which reveal the key desired properties for the design of efficient devices. (ii) The reorientational dyna...

The theory of optical activity presented in an earlier paper has been applied to helical structures, obtaining a compact formula for the residue rotation [ m ' ] ^ . In particular, the theory has been applied to the a-helix, and this theory consists of two parts: firstly the calculation of the magnitude and orientation of the polarisability tensor ellipsoid of the peptide residue from the locat...

3 M. C. Shaw, "Mechanical Activation-a Newly Developed Chemical Process," J. Appl. Mech., 15, 37 (1948). 4 W. R. Backer, E. R. Marshall, and M. C. Shaw, "The Size Effect in Metal Cutting," Trans. A.S.M.E., 74, 61 (1952). 5 A. H. Cottrell, chap. ii of B. Chalmers (ed.), Progress in Metal Physics, Vol. 1 (New York: Interscience Publishers, 1949). 6 E. R. Marshall and M. C. Shaw, "Forces in Dry Su...

A four-component reaction kinetics for the densities of mobile and non-excess sessile dislocations and of mobile and immobile disclinations is proposed to describe the mi-crostructure development under plastic deformation up to large strains. The densities of non-excess sessile dislocations and of immobile disclinations are connected to ow stress contributions. For the dislocation contribution,...

Orthodontic lingual root movement (torque) is an important aspect of treatment biomechanics and is typically achieved by torsion of a rectangular wire within the orthodontic bracket slot which introduces a force couple. The magnitude of the force moment achieved by wire torsion may be influenced by deformation of the orthodontic bracket. A device utilizing an optical image correlation technique...

Ash&act-In an earlier paper the authors proposed a geometrical description of distortional plastic hardening. The parameters of this model describe, in turn, all the elements of transformation of the initial yield surface, namely proportional expansion, translation, affine deformation, rotation, and distortion. The present paper is devoted to evolution equations for individual parameters: after...