Advanced Materials Research Vols. 760-762

Abstract: The application of GNSS is very extensive now and soft-radio technology based GNSS receiver is the trend of GNSS receiver product. In which the function of GNSS sigal acquisition is completed by running software and it will impact the performance of the receiver. Now, there are lots of achievements about GNSS sigal acquisition algorithm,but those achievements have big limitations such as the parameters of acquisition algorithm cant be adjusted according to the running condations adaptively and it cant give attention to two or morethings such as speed and sensitivity. Therefore,a algorithm that can adjust parameters of GNSS sigal acquisition algorithm adaptively according to running condations is put out in this paper. Finally, It is testified that the algorithm put out can give attention to two or morethings such as speed and sensitivity.

Abstract: By the Transfer Matrix Method (TMM), the properties of defect modes, such as splitting, coupling and filtering, have been researched in detail. The influence of refractive index and incident angle on the defect-mode coupling has been investigated. Simulating results exhibit that coupling mode split as two defect modes when they are close to each other. This property is closely related to the refractive index and the spacing interval between defect layers. The incident angle can reach 30 degree, which has a potential application in full angle filtering.

Abstract: The definition characteristics and basic principles of photoelectric interconnection technology used in electronic products are summarized in this paper. The main technologies of the photoelectric interconnection used in electronic products, and its development trend are reviewed, and existing problems of photoelectric interconnection technology development are pointed out. Finally, this paper prospects development trends of photoelectric interconnection technology in the future.

Abstract: To study the phenomena of photon migration in the knee joint is very important in the field of non-invasive near-infrared optical early diagnosis of osteoarthritis of the knee (KOA). In this paper, a photon propagation model of the knee layered structure based on Monte Carlo method is proposed. The migration trace and distribution rule of the photons in knee layered structure are simulated by the Monte Carlo modeling. The proportion of photons which collide with bone tissue then migrate out of the muscle tissue and photons directly migrate out of muscle tissue is calculated and analyzed. The conclusion is that the MC method provided in this study is useful to analyze the photon migration in knee layered structure and to place the detector in a suitable position.

Abstract: Third-harmonic generation in a special asymmetric quantum well is investigated. The third-harmonic generation coefficient is carried out by applying compact-density-matrix method. The numerical results are presented for a GaAs/AlGaAs asymmetric quantum well. The very large third-harmonic generation coefficient is obtained in this quantum well. Moreover, the third-harmonic generation coefficient dependents on the quantum well parameters are investigated, respectively.

Abstract: In this paper, a channel drop filter (CDF) is composed of two cubic lattice circular ring resonator cavities and point micro-cavities in a two-dimensional photonic crystal. The photonic band gap is calculated using the plane wave expansion (PWE) method and the optical characteristics of proposed structure are studying by the finite difference time domain (FDTD) method with perfectly matched layers (PMLs) acting as the boundary conditions . Two different wavelengths centered at 1773 nm and 1742 nm have been successful separation in this CDF. These demonstrate that our proposed structure is suitable for photonic integrated circuits (PICs) and coarse wavelength division multiplexing (WDM) optical communication systems.

Abstract: In this paper, a uniform impedance resonator (UIR) with a pair of identical stepped impedance open-circuited stubs loaded at two symmetrical positions with respect to its center is presented and analyzed for the design of a wideband micristrip bandpass filter (BPF). With compared to the conventional single open-ended stub loaded in the middle of the UIR or paired uniform stubs located at the two symmetrical position, the proposed resonator has the advantage of providing more freedom to adjust the bandwidth. Meanwhile, the two transmission zeros at both lower and higher sides of the passband ensure the filter has a good roll-off rate at the passband edge.

Abstract: This paper introduces a method of preparation of photonic crystals with non-magnetic ellipsoid as building blocks. Under the condition of above its glass-transition temperature, monodispersed polystyrene (PS) spheres with the diameter of 260 nm and 360 nm were respectively elastic stretched by applying external force with different values to get different ellipsoids with different aspect ratios. The assembly procedure was carried out by applying the vertical deposition self-assembly method in a magnetic field under the guidance of magnetic fluids. In this paper, We report the crystalline structure with long range order.

Abstract: The terahertz technology involves electromagnetics, semiconductor physics, optoelectronics, materials science and micro-processing technology and other disciplines. Based on terahertz technology, non-destructive testing has important research value and application prospect in the field of medical imaging, security checking, product testing and power system monitoring. The generation of terahertz technology and its advantages is described in this article, and an analysis is also given on the application of non-destructive testing based on terahertz technology in the field of smart grid such as cable accident warning, intelligent anti-theft system and electronic components monitoring.

Abstract: Multiple healing fatigue damage for polycrystal copper film was investigated by laser shock peening (LSP). The damaged specimens were healed several times under the optimal laser parameters. The relationship among the fatigue life, healing times and the damage degree were investigated. The experimental results showed that the multiple heal based on LSP can maximize fatigue life of the damaged specimens under the definite optimal condition with the obtained at damage degree of 0.4 and healing times of 3, in which nearly 4.6 times increase in residual fatigue life for the damaged specimens, and 7.8 times increase in the accumulated fatigue life.