INTRODUCTION Neuromuscular electrical stimulation (NMES) has been shown to be an effective treatment for muscular dysfunction. Yet, a fundamental barrier to NMES treatments is the rapid onset of muscle fatigue. The purpose of this study is to examine the effect of feedback-based frequency modulation on the closed-loop performance of the quadriceps during repeated dynamic contractions. METHODS...

Particles in a perfect lattice potential perform Bloch oscillations when subject to a constant force, leading to localization and preventing conductivity. For a weakly interacting Bose-Einstein condensate of Cs atoms, we observe giant center-of-mass oscillations in position space with a displacement across hundreds of lattice sites when we add a periodic modulation to the force near the Bloch f...

The self-resonating water jet offers the advantages of both a cavitation jet and a pulsed jet, and thus has been widely used for many practical applications. In the present study, the 120◦ -impinging edge Helmholtz nozzle was investigated for better erosion performance. The oscillating mechanism was analyzed from both numerical and experimental perspectives. The results showed that the cavitati...

Orientation detection and discrimination thresholds were measured for Gabor 'envelopes' formed from contrast-modulation of luminance 'carriers'. Consistent with previous research differences between carrier and envelope orientation had no effect on sensitivity to envelopes. Using plaid carriers in which the proportion of contrast modulation 'carried' by each plaid component was systematically m...

ABSTRACT The modulation of the intensity microwave emission from a plasma slab caused by standing linear kink fast magnetoacoustic wave is considered. stretched along straight magnetic field, and can represent, for example, current sheet in flaring active region corona Sun, or streamer pseudostreamer stalk. density non-uniform perpendicular direction described symmetric Epstein profile. paramet...

Daniel Nordin Kalevi Hyyppä Luleå University of Technology EISLAB SE-971 87, Luleå, Sweden E-mail: [email protected] Abstract. The lasing wavelength of a single-section distributed feedback DFB laser diode can be modulated by modulating the drive current. This makes it possible to utilize the DFB laser diode in a frequencymodulated continuous wave FMCW range and velocity measuring system...

The concept of non-linear output frequency response functions (NOFRFs) is extended to the non-linear systems that can be described by a multi-input Volterra series model. A new algorithm is also developed to determine the output frequency range of non-linear systems from the frequency range of the inputs. These results allow the concept of NOFRFs to be applied to a wide range of engineering sys...