Advanced Materials Research Vols. 179-180

Abstract: A purposed semi-cylindrical hyperlens is designed for nanolithography, which can form 20nm (or less) line width patterns with 193nm working wavelength. The hyperlens employs aluminum (Al, @193nm wavelength) and magnesium oxide (MgO, ) as the materials of alternating metal and dielectric thin layers. Taking aluminum instead of silver is a more economic solution for manufacture, and the dielectric coating acts as an anti-reflectivity of aluminum to enhance transmission. The optimum thickness of aluminum for best image fidelity has been found based on two 20nm wide slits with 40nm spacing. Incorporated with phase shifting mask (PSM) technology, the image contrast is much better than that of ordinary mask (Chrome on Glass, COG). The full wave simulations are executed and the results validated our approaches. The semi-cylindrical hyperlens made of aluminum and magnesium oxide gives potential for nano-scale manufacture, optical information storage and biomedical imaging.

Abstract: This paper presented a new DCT-based watermarking algorithm for vector digital maps. A watermark bit is embedded by modifying the relationship of several high-frequency coefficients in DCT domain. To enhance data accuracy and robustness of the watermark, we proposed a Double Error Estimation method. This method allowed watermarks to be embedded when the vertices with distortion are smaller than thresholds. Experiments show that the watermarks are resilient to random noise, general geometric transformation, data scrambling and cropping. The algorithm is blind and it is easy to implement.

Abstract: One kind of vinyl ester has been synthesized by treating epoxy resin with acrylic acid in toluene and characterized by Fourier transform infrared spectroscopy (FTIR). FTIR results showed that the epoxy resin is indeed reacted with acrylic acid through epoxy group and carboxyl of acrylic acid. The influences of reaction factors have been studied in detail. Experimental and properties testing results showed that this kind of vinyl ester, which obtained under the conditions of the temperature is 100 °C, amount of catalyst is 1.0 wt% and the feed ratio is 1.02:1(the molar ratio of acid to epoxy), is suitable as thickener for SMC(Sheet Moulding Compound).

Abstract: With the popularity of the concept of the “Hi-tech Olympics” and the rapid development of the computer technology, the modern science and technology, characteristic of “digital technology”, have permeated into all areas of sports. In particular, the virtual reality technology plays an important role in the competitive sports training. The paper discusses the major functions of the virtual reality technology and its mutual relations with the sports system simulation, explores the application scope of the technology in the sports system simulation field, and makes an overall analysis of its application prospects and trend in the sports training simulation in hope of pushing forward the research on “digital technology” in the competitive sports simulation and the relevant fields.

Abstract: In the plane coordinate system, x-coordinate and y-coordinate divide the plane into four quadrants. Combing the values of two-dimension data and the four quadrants, we can construct a general quad search tree easily. The quad search tree can be applied to all the two-dimension data. And, the height of the quad search tree can be reduced effectively, thus we can get a better search speed. The experiments have verified the validity and correctness of the quad search tree.

Abstract: The transient heat transfer equation of the sample with defects is built. Numerical simulation of PT(Pulsed Thermography, ‘PT’) testing is done against C30Steel sample with hole defects via finite element method. Results show that, both the maximum value of the surface temperature and the time of the appearance of the inflection points change with the change of the defect diameter and depth. The surface temperature curves can be used for quantitative study of the defect characteristics.

Abstract: We investigate the expected discounted penalty function in which the discount interest process is driven by markov process. We obtain the integro-differential equation satisfied by the expected discounted penalty function when interest process is perturbed by standard Wiener process and Poisson-Geometric process. A system of Laplace transforms of the expected discounted penalty function, given the initial environment state, is established from a system of integro-differential equations. One example is given with claim sizes that have exponential distributions.

Abstract: The risk model with dependence between interclaim arrivals and claim sizes is studied in the presence of multiple thresholds and stochastic interest. An integro-differential equation for some Gerber-Shiu discounted penalty functions is derived.

Abstract: Novel zirconium complex 2 has been prepared by treatment of the ligand complex 1 with ZrCl4•2THF in dichloromethane solution. The complex 1 and 2 were characterized by 1H-NMR and IR. Activated by MAO, Complex 2 displays very high activity for ethylene polymerization under the reaction temperature of 40～80 °C and the viscosity-average molecular weight of polyethylene is more than 3.0×104 when reaction temperature is no more than 60°C.The molecular-weight distribution measured by gel permeation reached 2.50.High melting points measured by DSC indicates that the polyethylene produced by complex 2 is high linearity and high crystallinity.

Abstract: The smooth-and-discontinue(SD) oscillator with time-dependent stiffness was put forward and founded to study dynamic characteristics of beam bridge under moving load. Mid-span deflection of beam bridge under moving load was described as vibration trace. Proper stiffness model function was elected and study nonlinear dynamic behaviors of mid-span deflection when several vehicles pass through bridge successively. The software MATLAB was used to simulate the model and obtain the bifurcation diagrams with parameter of vehicle speed and Poincare sections of the vehicle-bridge coupled system. The result shows the complicated nonlinear dynamics with periodic motion, quasi-periodic motion phenomena and chaos, the occurrence alternatively among these motions.