Based on the intermittent control and the nonlinear measure about l 2-norm, a novel and effective approach to synchronization of multi-chaotic systems with ring and chain connections is investigated. The proposed approach offers a design procedure for multi-chaos synchronization of a large class of chaotic systems. Numerical simulations of multi-chaotic Lorenz systems are given to illustrate the main results by choosing appropriate coupling coefficients by using the intermittent controllers.
Featured by cheap equipment, easy operation, nice controllability and low consumption, compound
electroless deposit becomes an effective method to avoid failures such as high-temperature
corrosion, fatigue and abrasion. Combined with the merits of nanometer material and laser
treatment technology, the Ni-P nanometer Al2O3 electroless deposit after laser strengthening can get
finer grains with high performances. This paper researched the technique of laser strengthening on
3Cr13 stainless steel after Ni-P-nano Al2O3 electroless plating. The experiments with low laser
power and high laser power were performed. The crystallinity, phases and element distribution of
coating were analyzed by X-ray Diffraction (XRD) and energy spectrometer (EDS). The
microhardness and wear resistance of coating were measured as well. The results showed that
composite coating heated by low laser power leads to transformation from non-crystal to crystal
with high hardness. When heated by high laser power, the electroless deposit layer melted, and most
of amorphous transformed to crystal. Combined with high laser power and high scanning velocity,
the electroless deposit with finer grains and excellent properties was obtained. The strengthening
mechanism was analyzed, and the properties including hardening and wear resistance were
investigated as well.
Expandable polystyrene and expandable polyethylene foams are frequently used in packaging of products. The study on their cushioning properties is important for the design of the transport package. The effect of compression speed and multiple reloading on the cushioning properties of HDEPS, LDEPS and HDEPE was studied in this paper. The results indicate that the cushioning properties of HDEPS and LDEPS are affected obviously by the compression speed, but the change of the cushioning properties for LDEPE was unconspicuous with the compression speed. LDEPE appeared obvious fatigue after twice reloads.
Effect of modified atmosphere packaging on the Hypomesus Olidus fresh quality under refrigerated (0±1°C) was investigated. By measuring sensory characteristics, pH, rate of juice leakage, TVB-N value, the effect of different gas mixtures were evaluated. The results indicated that MAP prevented the spoilage and the bacterial growth of sample was inhibited, and MAP was effective in extending shelf life of Hypomesus Olidus.
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