Advanced Materials Research Vol. 487

Abstract: Deflection is a mirror to health status of a bridge. Laser projection deflection monitoring (LPDM) method, which aims to monitor bridges’ vertical deflection remotely and automatically, is presented in this paper. Based on this idea, a set of LPDM system is designed. A practical experiment carried out on He’ergou bridge proves the measurement results of LPDM method are better than those of precision level. It also shows this method has advantages in operation and accuracy, especially for monitoring deflection of those long-span and high-fall bridges.

Abstract: In this paper, a coupled nonlinear diffusion partial differential equations (PDE) method for Interferometric Synthetic Aperture Sonar(InSAS) interferogram filtering was introduced. Many previous PDE methods in this area usually use Gauss pre-filtering. The choice of variance in Gauss function plays a very important role in the quality of the image obtained. Manually choice of the variance can hardly reach the self-adaptation aim. Using nonlinear diffusion equation to instead Gauss pre-filtering can overcome the disadvantage mentioned above. Numerical experiment results indicate that this coupled PDE method is able to effectively reduce the noise and preserve edge information. And it is important for InSAS real time processing.

Abstract: Pd-only catalyst supported on activated carbon has been prepared by chemical impregnation and used to catalyze the hydrogenation of 2-chloro-6-nitrotoluene (2-CNT) to 3-chloro-2-methylaniline in solvent-free condition. The effects of reaction temperature，H2 pressure on the hydrogenation have been investigated. The reaction showed very high selectivity with the dehalogenation side product with a yield of less than 1.2 %. The most favorable conditions could be temperature= 353 K, stirring speed= 1200 rpm, H2 pressure= 1 MPa. The catalytic hydrogenation reaction was found to have a zero order with hydrogen and 1 order with 2-CNT. The apparent activation energy of the hydrogenation was 60.58 kJ/mol.

Abstract: In this paper, Na⁺-doped silicon clathrate thin films were prepared on Si substrate by sol-gel method using zinc acetate and sodium carbonate as starting materials and the effects of the growth conditions on the structural of the films have been investigated by XRD, HRTEM, SAED analysis. The XRD results showed that there only existed a narrow and sharp peak around 2θ=32.94º which was assigned as the diffraction of Na₈Si₄₆ (321). However, the peak at 2θ=32.94º disappeared when it was heated to above 640°C due to the decomposition of the silicon clathrates. Minute Zn²⁺ ions in the gel was proved to promote the formation of Na^-doped silicon clathrates. The HRTEM photos revealed that the thickness of the films was only about 15nm, and there existed no obvious interfaces between the film and the silicon substrate.

Abstract: Superplasticity is a physical phenomenon associated with certain polycrystalline materials which exhibit very high tensile elongation prior to fracture under particular conditions of strain rate and temperature. Aluminium alloy undergoes superplastic elongation in the order of a few thousands percent in elongation with low flow stresses. Superplastic forming processes can provide products with integral structure, light weight and superior strength, all of which are of particular importance for aerospace and automotive components. In the present study an analytical model was developed for a rectangular component by considering constant strain rate. This paper attempts to explore the superplastic behaviors of 8090 Al-Li alloy sheet into a rectangular die using blow forming technique. This has been done by a simple theoretical model and by numerical simulation using standard finite element code ABAQUS. The numerical and analytical results agree reasonably well for both the analytical and theoretical values with regard to variation in pressure and time.

Abstract: A compact lowpass filter using two single-sided compact microstrip resonator cells （CMRCs）with low insertion loss and broad bandwidth is presented. The cutoff frequency is about 1.4 GHz, the insertion loss is less than 0.6 dB and the 20dB bandwidth is up to the range from 2.1 GHz to 9.8 GHz by means of introducing four transmission zeros through two CMRCs. In addition, the simulated results demonstrate that the proposed filter is characterized by a compact size, low insertion loss, sharp transition, low return loss and wide bandwidth.

Abstract: To solve the problems of traditional library book vehicle: high labor intensity and low efficiency, a new book vehicle with electric power assistant was studied and designed. It included the body system and the control system. The body system could load books and achieve orientation function. The control system could achieve electric power assistant automatically according to wheel speed. The book vehicle was advantaged in simple structure, easy to use, saving manpower, high efficiency, so it was deserved to be used wildly.

Abstract: Abstract: With economic development rapid, energy demand is also growing.How to save energy in the energy exploitation process is a problems of the world attention. At present, condensation water of heating system in the steam heating system and thermal power enterprises is Is recovered and re-used by the various types of condensation water recovery equipment.The closed condensation water recovery equipment is an energy conservation device which energy saving effect is very good .It is used at the gas pipe and network equipment to reclaim condensation water so that the will be wasted natural resources are fully utilized. This article discussions one kind of internal pressure fuzzy control of collecting water unit(CWU) from electric intelligent control .This electric intelligent pressure fuzzy control system can let the water recovery equipment device operation in multiple public network, constant pressure and level, high temperatures, the fully automatic, safe and reliable status.

Abstract: This article introduces the application of crosshole sonic logging in foundation pile integrity detection and the basic theory and application of crosshole sonic logging, and narrates the detection technology and way to judge detection results by engineering projects.

Abstract: The analysis of the linkage between ground station and satellite is the premise of scheduling the ground data receiving task, which includes the time window calculation, satellite relative antenna's azimuth, elevation angle calculation. This article studies the linkage between ground station and satellite. Meanwhile, with the aid of the world wind platform, it develops the demo software of the 3-dimensional modeling to study the simulation to link the star, and it can calculate time window, the azimuth angle between the land and elevation angle. It proves that software-testing results agree with STK software calculation results. Thus, the software is reliable to provide the scientific basis for the selection of ground stations' location and nets planning.