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Robotic lower limb exoskeletons are becoming increasingly popular in therapy and recreational use. However, most exoskeletons are still rather limited in their locomotion speed and the activities of daily live they can perform. Furthermore, they typically do not allow for a dynamic adaptation to the environment, as they are often controlled with predefined reference trajectories. Inspired by human...
A series of orthogonal experiments have been carried out to study the effect of different rake angles, cutting depths and spindle speeds on residual stress distribution during turning of 20Cr2Ni4 steel. Four characteristic values are selected from the typical residual stress distribution profile: surface residual stress, the depth of tensile stress, the maximum residual compressive stress and the...
We demonstrate a SOI-based integrated receiver (Rx) module for the TWDM-PON. The downstream can be de-multiplexed by a tunable de-multiplexer using cascaded silicon-micro-ring and each channel is received by germanium-on-silicon photodiode.
GCL used as impervious liner may be damaged in the putting of large area. In order to quantitatively cognize the impervious ability of the damaged GCL, a series of penetrant tests of different punctured flaw have been done to know the relationship between ability of healing itself and damaged extent. Tests are done in the flexible wall permeator according to ASTM. By penetrated tests of different...
Wearable devices to assist abnormal gaits require controllers that interact with the user in an intuitive and unobtrusive manner. To design such a controller, we investigated a bio-inspired walking controller for orthoses and prostheses. We present (i) a Simulink neuromuscular control library derived from a computational model of reflexive neuromuscular control of human gait with a central pattern...
Conformal treatment planning for radiosurgical dose delivery is challenging for irregularly shaped target volumes. Spheres of radiation dose, called “shots”, must be positioned within a target image to yield an acceptable cumulative dose distribution. An automated solution has been developed that uses target shape, as represented by the 3D medial axis transform, to determine optimal shot positions,...
A new approach in fuzzy adaptive filtering is presented in this paper. The proposed fuzzy filter is constructed from a set of fuzzy IF-THEN rules. Based on the observations of input signal and a collection of desired response, the filter parameters are updated by the Lyapunov sense fuzzy rules so that the error can asymptotically converge to zero. This scheme is the extension of the idea of Lyapunov theory-based adaptive filtering...
A new fuzzy adaptive filter using Lyapunov stability theory is proposed in this paper. This fuzzy adaptive filter is constructed from a set of changeable fuzzy IF-THEN rules. The adaptive algorithm, Lyapunov theory-based adaptive filtering (LAF) is used to update the parameter of the membership functions so that the dynamic error between the filter output and the desired response converges to zero...
We search for steady TeV γ-rays from 18 pulsars in the Fermi-LAT pulsar catalog using the Tibet air shower array. We observe 8 sources including the Crab against expected 0.41 sources at a significance of 2σ or more among the 18 pulsars. The chance probability from Poisson statistics is estimated to be 1.4×10-8.With the Crab excluded, it is estimated to be 1.8×10-7. These low chance probabilities...
A method for subjective assessment of picture quality based on supra-threshold levels is presented. In the proposed approach, picture quality is graded relative to supra-threshold points in a recursive manner as opposed to the common absolute category rating scale. In addition, assessments were carried out with full resolution and sub-resolution pictures to measure the presence of quality disparity...
Exchange bias (EB) effect has been intensively studied for more than half century due to its applications in spintronics devices, such as giant magneto resistance (GMR) read heads and magnetic random access memory (MRAM).[1] Except for conventional ferromagnetic (FM)-antiferromag-netic (AFM) system, EB has also been reported in other magnetic systems, such as ferromagnetic (FM)-ferromagnetic (FIM)...
The MnCoGe system has attracted lots of attention for its tunable martensitic transition via chemical and physical pressure and has the potential application in room temperature magnetic refrigeration technique and magnetic shape memory effect1. The melt spinning of alloys has the advantages of shortening even avoiding the thermal annealing process to reach homogenization, fabricating alloys with...
The (La1−yPry)1−xCaxMnO3 systems has been extensively studied in recent years as a typical electronic phase separation(PS) system. [1-4] As well known, the average radius of A sites in the ABO3 structure plays a key role in determining the band (W) and electronic characteristics of the perovskite manganites. Uehara et al has found that the chemical replacement of Pr for La (Pr is smaller than La)...
We investigate athermal characteristics of silicon waveguides clad with TiO2. The measured ring resonance wavelengths near 1.3 μm over 20–50°C exhibit second-order thermo-optical effects and spectral dependency, implying second-order effects from TiO2 and Si combination.
Experimental demonstrations of ring resonators with TiO2 cores are presented and measured with −2.9pm/K resonance shift. Their thermo-stress-optic behavior was found to be important to their function; therefore an inclusive model is presented and simulated numerically.
Mathematical analysis, supported by computer simulations is used to find a theoretical limit to cell size reduction in cellular wireless network in a shadowed fading environment. Information capacity measure based on the uplink of cellular wireless network is used for the analysis. Results show that at higher microwave carrier frequencies and smaller cell radius some of the second tier co-channel...
Optical frequency comb generators, when combined with line-by-line pulse shaping, allow for the synthesis of programmable microwave photonic phase filters. The filter's achievable time-bandwidth product is related to the number of comb lines that can be individually manipulated. In this contribution, we present a flat ultra-broad optical frequency comb generator based on external non-linear broadening...
We discuss research at Purdue University in which ultrafast optical signal processing approaches are adapted for generation, processing, and compression of ultrabroadband RF electrical signals.
We demonstrate picosecond optical pulse generation based on a directly generated 10 GHz Gaussian-shaped optical frequency comb using only intensity and phase modulators. The quadratic comb phase allows for pulse compensation with only single-mode fibers.
The effects of dispersion states of carbon nanotubes on thermal conductivity and Micro-hardness of Multi-walled carbon nanotube (MWCNT) reinforced copper nanocomposites were investigated. The nanocomposites were fabricated in a novel method. It involves the synthesis of MWCNT-implanted copper composite spheres and the preparation of the MWCNT/copper bulk materials using vacuum hot pressing and hot...
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