Advanced Materials Research Vols. 468-471

Abstract: Based on the heave compensation system during the installation in the deepwater, the performance of the hydraulic unit and the control unit is researched .The mathematical models which is about the flow characteristics ,the load pressure and the Mechanics balance on the hydraulic- Control system are built, and then the models are simulated by using the PID control method. The simulation results are showed under the different levels, and the best match of the control parameters is found by the different objects，to realize the intelligent designing in heave compensation system.

Abstract: We studied the ground-state-transition of a vertically coupled four-layer single electron QDs system under a magnetic field by the exact diagonalization of the Hamiltonian matrix. For S=0, the energy spectra of the Dots are calculated as a function of applied magnetic field. We found discontinuous ground-state-transition induced by an external magnetic field in the case of strong coupling. However, in the case of weak coupling, such a transition does not occur.

Abstract: An optimization procedural method for designing fiber reinforced polymer (FRP) plate for strengthening reinforced concrete beam is presented. The optimization procedure is formulated to find the design variables leading to the minimum cost of structural strengthening system using CFRP plate with constraints imposed based on TR55 code provisions. Genetic algorithm based approach is utilized to solve the optimization task. The cost of FRP plate and epoxy adhesive is included in the formulation of the objective function. The ultimate limit states and the serviceability limit states are included in formulation of constraints. A numerical example is given to show the validity of the proposed optimization method.

Abstract: As indium tin oxide (ITO) can not meet the demands of many devices due to its fragility, graphene seems to be a good alternative for transparent conductor purpose. Here we employ two methods to prepare graphene oxide films, and then process them with hydroiodic acid (HI) for reduction, aiming to get an optimized scheme and higher film quality. Finally the reduced graphene oxide films with transmittance of 70~80% at 550nm show sheet resistance of <10kΩ, which are good enough for transparent conductor uses. This study portends a promising future in this field.

Abstract: In this paper, we discuss the difference between intelligent and non-intelligent system, and analyze some problems in the development and research of auto-control system in the cold storage. These problems involve engineering survey, predictive control of technical parameters, control reliability of machinery equipment, local control and global control. And the methods of artificial neural networks, genetic algorithm and least square are put forward to resolve them.

Abstract: Three groups of commercial 5052 Al alloy sheets were subjected to groove pressing (GP) at room temperature using parallel GP, 180° cross GP and 90° cross GP, respectively. Mechanical properties and fracture modes of as-annealed and GPed samples were investigated. The microhardness of the samples processed by parallel GP increases by a factor of about 1.6 compared to the as-annealed state, and that of the samples processed by cross GP is higher. The ultimate tensile strength (UTS) increases significantly after GP, while the elongation decreases. But they are strongly dependence on the number of GP passes and the pressing modes. Besides, fracture surface morphology demonstrates that the fracture mode is ductile even after four passes. With increasing the number of GP pass, the amount of small dimples increases, and the dimples become shallow and more uniform.

Abstract: In this paper, we presented a MEMS-based method of manufacturing micro fluxgate sensors. Micro-solenoid coils acting as excitation and sensing elements of the sensors were fabricated by MEMS technology and thick photoresist-based UV-lithography. Different processes were used to fabricate the magnetic cores made of different soft magnetic materials, respectively. Permalloy core was formed by electroplating, whereas gluing and chemical wet etching were adopted in the fabrication of the nanocrystalline alloy core. The two micro fluxgate sensors were characterized by a magnetic field measuring system. The experimental results showed that the micro fluxgate sensors possess high sensitivity, wide linear measuring range and low power consumption.

Abstract: A lateral displacement control method of a moving web using an offset-pivot guide system for intermittent web transportation is presented in this paper. The dynamics model of the offset-pivot guide system is investigated, and the factors resulting in the lateral displacement of the web are researched and analyzed. In the case of intermittent web transportation, iterative learning control (ILC) is adopted to eliminate the periodic disturbance. Simulations show that the iterative learning control method adopted is very effective to resist the lateral displacement of the web by using the offset-pivot guide system.

Abstract: Select a residential projects under construction in Chongqing for the study, testing on indoor radon concentration at different decorated stages. This survey found that indoor radon concentration values for the selected test points are lower than the national limits, meet the requirements. Through decoration, decoration materials such as cement mortar, latex paint, wallpaper, flooring and other ways to reduce indoor radon concentration is possible. The other hand, use of porcelain tiles will elevate indoor radon concentration, so you should master its radioactive contents in advance when you select the repair material, choose green materials as possible.

Abstract: Organic matter in soils and sediments is the key object of biogeochemistry in both terrestrial and marine ecosystems. Whether organic matter is the source or sink of carbon and nutrients can be predicted by its compositions and need continuous, long-term observations of organic matter compositions; therefore, in situ technologies are being investigated to meet the continuous, long-term observations. This study tried to explore a rapid determination of organic matter compositions by ozone chemiluminescence. After the soils or sediments were oxidized by ozone, their chemiluminescence characteristics such as luminescence maximum and time differed significantly. We hypothesized that the luminescence characteristics is controlled by the organic matter compositions. The soils and sediments were separated into extractives, acid soluble fractions (AS), and acid insoluble fractions (AIF), and then the original samples and their compositions were oxidized by ozone. Different organic matter compositions play a different role in the luminescence characteristics: extractives inhibited the luminescence maximum and luminescence time, AS increased the luminescence time and AIF increased the luminescence maximum. Results also showed that AIF can explain most variation of luminescence characteristics, suggesting that the luminescence characteristics are mainly controlled by the concentrations of AIF. Our study suggested that ozonaiton chemiluminescence have a strong potential to rapidly determine the chemistry of soils and sediments.