Advanced Materials Research Vols. 378-379

Abstract: Piled embankments are increasingly used to construct highways on soft soils. End-bearing piles for supporting embankment exhibit different characteristics for the soil arch developed within the embankments. A numerical analysis was conducted to evaluate the soil stress concentration ratio, pile and soil settlements, pile axial force, negative skin friction (NSF) and location of the neutral plane (NP) during embankment filling and consolidation of soft soils. The results indicate that the stress concentration ratio varies with time and most of the embankment load is born by the pile. The soil pressure on the soft soils increase and reach a maximum value during the filling, then decrease gradually and maintain nearly a constant value at the end of the consolidation. The settlement of shallow soft soils differs significantly from that of the deep soft soils. The location of the NP shows a complicated variation.

Abstract: In the traditional classification of the soil stratums, geological engineers mostly classify the soil stratums according to their experience. However, it is very probable that these classification results are subjective, random and uncertain. There is a significant regional difference, so different people may have different results for the same soil stratums classification. Therefore, the concept of fuzzy cluster is introduced in this paper, which makes the physics-mechanical indexes of the soil as the basic parameters, and the soil stratums are classified through mathematical analysis. In order to ensure that classification results are reasonable and effective, the cluster validity index is applied to test results. Through engineering examples analysis, the present classification method is practicable in geotechnical stratums division.

Abstract: The selection of bracing system for a deep excavation is a quite complex system engineering which relates to many target factors of safety and feasibility, economy and rationality, construction period, convenience of construction and environmental protection. In order to avoid the casualness in determining subjective weight by traditional fuzzy analytic hierarchy process evaluation, taking information entropy into consideration, the comprehensive evaluation model was established. This model is proved to be reasonable and effective by an engineering example.

Abstract: Bioprocesses have high nonlinearity and parameter uncertainty. In view of these specific natures of the bioreactor, system identification method was firstly used to linearize the nonlinear system and simplify the model of the biological reactor; then a new sliding mode controller with adaptive reaching law is designed for the reactor. The control method can not only analysis the sliding mode movement near or along the switching surface, but also design the dynamic process in trending segments of the system effectively, thus ensure good movement quality in the entire state space. Simulation results prove that the sliding mode control with adaptive reaching law can improve the control performance with negligible chattering and enhanced robustness.

Abstract: This paper presents a multi-criteria group decision making method based TOPSIS, which can be used to deal with heterogeneous information(the numerical, interval valued and linguistic variable with different granularity). The uniform and aggregation of the heterogeneous information is investigated to effectively avoid loss of information. The OWA Operator based on separation measures is constructed. Finally, a numerical experiment is used to illustrate the feasibility of the proposed method.

Abstract: In near future, silicon-on-insulator (SOI) microring resonator are expected to be basic components for wavelength filtering and switching due to their compact size and wide free spectral range (FSR). In this paper, a 2X2 optical switch by using active microring resonator is proposed. The switch is consists of second order serially cascaded microring coupled to a pair of waveguide. The ON/OFF state of the design is control by electric signal which will vary the refractive index. The device is design to operate at 1.55µm wavelength. With a 500nm x 200nm rib dimensions, the design is proven to have single mode behaviour. Finite-Difference Time-Domain (FDTD) method simulation by RSOFT software is use to characterize the device performance. The results show that the 2X2 optical switch proposed can be an efficient device to be functioning in WDM application.

Abstract: Conductive plastics are attracting more and more interest in electronics due to their light weight and inability to rust, which are common problems associated with metals. In this work silicone rubbers reinforced with conductive fillers have been fabricated for use in various applications in electronics, telecommunications, and electronics enclosures, or to protect human factor, namely protective clothing. This paper presents the results of experimental determinations concerning electromagnetic field attenuation in materials containing micro-particles of nanocarbon in their structure. To know the effect of shielding effectiveness of electromagnetic field electromagnetic absorbents were performed by transmission measurements of attenuation in the frequency range 1-18 GHz. The goal of present paper consits in the realization a composit material with polymeric matrix. The materials were characterized by transmision diminishing carried out, relative permittivity, compression test and electrical conductivity.

Abstract: This paper analyses and designs a kind of pulse-driving based wireless power transmission system via coupled magnetic resonances. It analyzes the influence of the related parameters on the transfer efficiency and transfer power of the system. The experiment tests the proposed wireless power transmission system, and the results show that the above relevant parameters should be comprehensively considered, in order to achieve the optimization design of the transmission efficiency or transmission power. The experiment results also show the validity of the theoretical analysis.

Abstract: A valve based on electro-rheological fluid (ERF) is introduced for its possibility of being a very small volume and power consuming. A novel linking method of these multiple valves and their control strategy contribute to the accomplishment of saving the numbers of power modules and the system power consuming, eventually the volume and weight of the system. For a N times M valves matrix, the saving numbers of power modules used for driving these valves are the difference between the product of N and M, and the plus of N and M. It provides a novel solution of shrinking system for a portable mechatronic embedded system application. A demonstration of these valves matrix on multi-line Braille displayer for blind people is shown.

Abstract: In this paper, we presented the performance analysis of Silicon- on- Insulator (SOI) based, four channels optical wavelength demultiplexer using microrings. The characterizations are done employing Finite- Difference Time- Domain (FDTD) mode simulations from RSOFT. Serially cascaded microring arrays up to the third order are demonstrated to discuss the design issues of the laterally coupled wavelength demultiplexer. Characteristics like the Free Spectral Range (FSR), crosstalk and insertion loss losses are studied.