Advanced Materials Research Vols. 756-759

Abstract: The Henkel plot and the Δm plot of a longitudinal barium ferrite hard disk and γ-Fe2O3 flexible disk were simulated by the improved Preisach-DOK model.The study results show that the barium ferrite exhibit large positive interactions, as shown by large positive in the Δm plot, and tend to resist demagnetization, leading the oriented barium ferrite possess the unusual remanence characteristic.

Abstract: on the basis of the data from the previous box-behnken central composite design, an Artificial Neural Network (ANN) model was constructed for the prediction of outputs of carotenoids. GA (genetic algorithm) was used to search for the optimal culture medium for Rhodospirillum Rubrum S1:citric acid 3.678g/L, Beef extract 3.407 g/L, MgSO4 0.524g/L, FeSO40.023g/L. In the optimal culture medium, it was predicted that the outputs of the carotenoids were13.85 mg/ L.After three verification experiments, the outputs of the carotenoids were 13.72mg/L, the error between the expected value and the experimental value was 0.93%.

Abstract: In this paper, the best crystal length and transmission of quasi-three-level 946nm Nd:YAG laser is analyzed and optimized. Under the different condition of pump power loss of cavity and mode matching the analysis show that one should select different length of laser crystal and different transmission if one wants to make the lasers output power is maximum.

Abstract: In order to enhance the extraction rate of polysaccharides, a series of statistical approach was used to optimize the ultrasonic-assisted extraction conditions from the mycelium of Paecilomyces tenuipes Pt196. [Metho The optimization of conditions was carried out in two stages. Firstly, the effects of various experimental parameters considered for the investigation (ultrasonic power, ultrasonic time and liquid-solid ratio) were studied using the method of single factor test design experiments. Secondly, a 15-run Box-Behnken design was performed to optimize the extraction conditions of polysaccharides. The experimental results of Box-Behnken design were analyzed by response surface methodology and artificial neural network together with genetic algorithm. [Result The optimum conditions for polysaccharides extraction obtained by the application of artificial neural network-genetic algorithm were ultrasonic time 345s, ultrasonic power 320 W and liquid-solid ratio 95 mL·g-1. [Conclusion Artificial neural network-genetic algorithm can effectively select the best extraction conditions of polysaccharides in this study.

Abstract: Based on the finite element analysis software ABAQUS, the nonlinear analysis of a reinforced concrete beam was carried out In this simple beam analysis, the concrete damage plasticity model in ABAQUS has been introduced thoroughly. Finally, the results of the experimentation and the ABAQUS analysis were compared in a diagram, accordingly reasons of the result difference between the two methods were discussed about, which can be a useful reference for the further study of the finite element analysis on ABAQUS.

Abstract: With the characteristics of large load carrying capacity and good seismic performance, SRC are always used as important vertical components to stand load. Once destroyed, leading to serious consequences and even progressive collapse. Recently, the bombings occurred frequently, lots of buildings are destroyed as a result of explosion and bring great threat to human beings. Therefore, how to improve the structure of the explosion protection performance caused widely concern in the engineering sector. The finite element software ABAQUS is used to analyze the dynamic response of SRC column under blast loading, the response curves of the column is completely different with different column-ends constraints. Compared with one end consolidation constraints, both ends consolidation constraints can significantly reduce the vibration displacement. Appropriate to increase the stirrup and steel sections can improve the ductility of SRC columns, and the displacement amplitude and the extent of damage of column can be reduced, the performance of explosion proof can be improved. The papers research can make a reference to the future research for dynamic response analysis and explosion protection of SRC column under blast loading.

Abstract: Finite element model of a pre-stressed bridge is established using finite element software Abaqus according to the characteristics of the bridge. Three static loads are respectively applied to the model to investigate the stress distribution. Numerical calculation results of stress and displacement show that the design of the bridge meets the requirements of static loading.

Abstract: This article focuses on the study of the influence of ceiling materials to roof radiation heat exchange by CFD numerical simulation, which provides a theoretical basis for the choice of ceiling materials from the perspective of thermal properties.

Abstract: In this paper, we present an 8-bit 5 Gsample/s time-interleaved analog-to-digital converter (TI ADC). A 4-phase low jitter clock is designed to control four 1.25 Gsample/s sub-ADCs which is implemented using folding and interpolating architecture. Digital calibration is used to adjust the offset error and gain error of sub-ADCs. Meanwhile, serial peripheral interface (SPI) is adopted to adjust mismatch of gain and sample time between sub-ADCs. The whole TI ADC is designed using a 0.18m SiGe BiCMOS process. The whole ADC has a SNR of about 45 dB at the input frequency of 495 MHZ and an equivalent ENOB of 7.2 bits.

Abstract: The traditional CSMA MAC node simply blocks its transmission if the medium is sensed to be busy. Thus, it is inefficient in terms of the network throughput due to overcautious estimation of the interference. In this paper, we propose a novel location-aware medium access protocol for data intensive wireless sensor networks. In this protocol, the contending nodes make use of their location information to achieve the concurrent transmission of exposed terminal so as to reduce collisions and improve the overall performance. We evaluate it in terms of delay and throughput and compare it with S-AMC using simulations. Results show that the proposed MAC protocol can take advantage of the location distribution of nodes to improve the average throughput of the network, reducing data transmission delay, and effectively improving the efficiency and performance in data intensive wireless sensor networks compared to S-AMC.