Advanced Materials Research Vols. 1006-1007

Abstract: Watermarking algorithms are the one of the effective methods to protect the copyright of digital products. There are many types of watermarking algorithms, in this paper, methods based on optimization algorithms, also named computational intelligence, are surveyed. The detail procedure of watermark embedding and the watermarking extraction is described, and the basic theory application of computational intelligence is also analyzed. Finally, the advice of these types of watermarking algorithm is given.

Abstract: The depth map is a basic diagram of the intrinsic; each pixel value represents the scene graph the elevation position of the object point. In this paper, the analysis methods for target classification elevation map. Figure elevation are visible depth image, the depth of the image is the distance from each point in the scene to the image capture device values ​​of the image as an image pixel value.

Abstract: A novel solar tracking method based on field programmable gate array (FPGA) is proposed to improve the photoelectric conversion rate of the solar cell unit area. In this method, the sun angle tracking is utilized to track, and tracking solar panels reach the altitude angle azimuth tracking position. Then four voltage signals of photo resistor sensors is used to compare the north-south direction and east-west direction respectively, in order to micro adjust the solar panels to getting same point voltage, enabling to achieve accurate sunlight tracking and positioning. Experimental results show that this method can accurately track the tracking the sun, and it has improving solar absorption efficiency of the solar tracking device.

Abstract: In this work, a palladium film has been evaporated on an n-silicon (n-n⁺-Si) surface and electrochemically activated by cyclic voltammetry (CV) to form a modified silicon photo-electrode. Scanning electron microscope (SEM) and x-ray photoelectron spectroscopy (XPS) were used to characterize the morphology and composition of the modified electrode surface. A new photoelectrochemical (PEC) cell based on the modified electrode was used as sensor for hydrazine determination by photocurrent measurements. The sensor showed good photocurrent responses by adding different concentrations of hydrazine with a good stability. The linear ranges for the detection of hydrazine are 2 to 20 μM with a detection limit of 0.5 μM in pH=7.0 phosphate buffer solution (PBS).

Abstract: Based on Electromagnetic Environmental Sensory(EES)and Multiple-input Multiple-Out(MIMO) radar sensing algorithm , this paper presents SVD-TLD perception algorithm, which firstly use the cross-spectrum AR model parameter estimation, and secondly considering the cross-correlation matrix of the estimation error function disturbance and lastly taking into account of the two ends of the equation, using the cross-correlation function of the estimated measurement errors to affect the Total Least Squares (TLS) method . Compared with the AR model parameter estimation, the accuracy of SVD algorithm cross-spectral estimation has significantly improved, greatly reducing the amount of computation and is more conducive to real-time online computing.

Abstract: A water-soluble fluorescent probe was described for detecting hydrogen peroxide with the carbazole-derived as fluorophore and boronate moiety as recognition unit. The probe was developed as a turn-off fluorescent chemosensor with fast, high selectivity and sensitivity toward H₂O₂ over other biological reactive oxygen species. What is more, the probe was quenched linear response to H₂O₂ concentration in the range of 1.0×10⁻⁸ - 2.0×10⁻⁵ M and lower detection limit down to 6 nM (S / N = 3) was obtained.

Abstract: Normal depth plays a significant role in the design of open channels and in the analysis of the non-uniform flow as well. Currently, there is no analytical method for calculation of the normal depth in open channels, including the horseshoe profile. Current methods are either iterative or approximate. They also consider, unreasonably, Chezy’s coefficient or Manning’s roughness coefficient as a given data of the problem, despite the fact that these coefficients depend on the normal depth sought. In this study, a new analytical method is presented for calculating the normal depth in a horseshoe shaped tunnel. The method takes into account, in particular, the effect of the absolute roughness which is a readily measurable parameter in practice. In a first step, the method is applied to a referential rough model in order to establish the relationships that govern its hydraulic characteristics. In a second step, these equations are used to easily deduce the required normal depth by introducing a non-dimensional correction factor. A practical example is considered to better explain the advocated method and to appreciate its simplicity and efficiency.

Abstract: Based on the Maxwell equations in time-harmonic conditions, analytical model for cylindrical coil above multi-layered conductive structures of infinite large is built, the general solution for integral expression of coil’s impedance is derived. As the complex computation and inconvenient adjustment for calculating precision of integral form, the truncated region eigenfunction expansion is adopted to derive the series expansion expression of coil’s impedance. Calculating precision is ensured by selecting the truncating radius and the number of summation terms properly. Use Mathematica and CIVA separately compute the impedance variation of coil above the single conductive layer of different thickness. The results are highly identical and verify the validity of series expansion expression. The expression can provide help for optimizing the parameters of eddy current sensor.

Abstract: Control system of eddy current dynamometer is one of the keys of the test bench of engine performance .The P-Fuzzy-PI composite controller were investigated and and was applied on eddy current dynamometer’s control. Host computer program was developed based on LabVIEW. Engine load characteristic test was conducted , The Experiment Result Indicated that P-Fuzzy-PI composite controller has advantages of fast responsing, small overshooting ,high control accuracy and so on .

Abstract: The study explores the vibration sensing effect of Ni-Mn-Ga shape memory alloy, based on the experimental results, researched the characteristics of this alloy applied in mechanical vibration signal sensors, and describes the feasibility of this alloy used for vibration measurements.