The theory of multiresolution decomposition and wavelets is used to study the e ective properties of a thin elastic plate with surface mass density or sti ness heterogeneity, subjected to time-harmonic forcing. The heterogeneity possesses microand macro-scale variations, and has a macroscale outer dimension. It is shown that the microscale mass variation has practically no e ect on the macrosca...

Current methods for measuring sti!ness during human arm movements are either limited to one-joint motions, or lead to systematic errors. The technique presented here enables a simple, accurate and unbiased measurement of endpoint sti!ness during multi-joint movements. Using a computer-controlled mechanical interface, the hand is displaced relative to a prediction of the undisturbed trajectory. ...

RATIONALE Arterial injuries during total knee arthroplasty (TKA) though rare may occur. Hemophilia may further challenge the management of such injury. PATIENT CONCERNS A 48-year-old male patient with severe hemophilia type A and stiff knee arthropathy underwent bilateral TKAs. Left popliteal artery injury was detected at the end of the left TKA. DIAGNOSES Urgent angiography confirmed the d...

The increased number of women participating in sports has led to a higher knee injury rate in women compared with men. Among these injuries, those occurring to the ACL are commonly observed during landing maneuvers. The purpose of this study was to determine gender differences in landing strategies during unilateral and bilateral landings. Sixteen male and 17 female recreational athletes were r...

We investigate kinetic models of a system in contact with several spatially homogeneous thermal reservoirs at different temperatures. We explicitly find all spatially homogeneous non-equilibrium stationary states (NESS). We then consider the question of whether there are also non spatially uniform NESS. This remains partly open in general, except for a class of models to which we can apply prob...

A new discovery on the sti ness contr ol in robotics, as well as its applic ations in grasping and dextrous manipulation, is presente d. Extended from the Conservative Congruence T ransformation (CCT) theory, the new theory accounts for the change in geometry and the noncommutative rotational property of the Cartesian sti ness in grasping and dextrous manipulation using sti ness control when th...

' Assistant Executive Director, Committee on Prosthetics Research and Development, National Research Council—National Academy of Sciences. This paper is a revision of Report E-2, which was prepared on behalf of the Subcommittee on Evaluation, CPRD. The study was supported by Contract SRS-70-11 between the Social and Rehabilitation Service and the National Academy of Sciences. AN CERTAIN patholo...