Advanced Materials Research Vol. 459

Abstract: Wireless power transfer via magnetic resonance coupling is a new technology which energy can be transferred in the non-radiative near-field. In order to improve its power, We presented a new analysis that yielded critical insight into the design of practical system . The basic study on coils design and impedance matching network for hundreds of watts was presented. Based on these analysis, The wireless power transfer experimental device was designed. Experimental results shows that the power can be transmitted is up to 300W in the distance of 2.3 m, the efficiency is 60%.

Abstract: Water conservancy and hydropower projects are the important parts of national capital construction. Since the reform and opening up, it has been 30 years,construction trade develops fast and the construction market takes initial shape.Butwith the constant development of the reform and opening up and national economy,higher request is put forward in construction engineering and construction trade, withmany characteristics of large investment, long time, high construction difficulty, complicated technology and engineering participants in water conservancy and hydropower construction project, and many unforeseen factors occur in construction process. The engineering project is a high-risk construction process, and participants of engineering construction face all kinds of risks inevitably, so if we do not guard against it, this will cause the engineering construction not to go on smoothly, even cause serious consequences. Therefore, the risk management of engineering project is particularly important. To study the risk of construction projects, and to strengthen the risk management of construction engineering project, which can adapt to the objective demand of international construction market, and are good for national capital construction and national economic development.

Abstract: It difficult to achieve consistency and sharing storage of model library and data resources, realize modeling and functional classification and improve low efficiency based on multi-body simulation and optimization. Cloud computing concept and method are introduced in order to solve these problems. In addition, a multi-body dynamics system modeling and simulation platform for the cloud computing is established and the basic solution process of the platform is explained, which can realize security sharing, optimization and reuse of model resources of system, computing resources and data resources. Finally, feasibility analysis is to be made.

Abstract: A no interference optical image encryption is put forward in this paper. The encrypting process is composed of a Fresnel diffraction and a Fourier transformation. A digital image coded with a random phase plate first takes a Fresnel diffraction. The diffraction function is enlarged and coded with another random phase mask. At last the enlarged function undergoes a Fourier transformation. The real part of the transformed function is defined as an encrypted image. In decrypting process, first the encrypted image takes an inverse Fourier transformation. Then the upper left corner of the transformed function is intercepted. According to the space inversion of the transformed function, if the intercepted function takes an inverse Fresnel diffraction, the original digital image can be restored from the final diffraction function. Because there is no interference process in encryption and decryption, the optical system is relatively simple and the quality of restored image is very good

Abstract: Pectus excavatum is the most common congenital chest wall deformity. Extensive corrective surgery prior to age 3 may disturb chest wall growth and result in a constricted thorax. We paid particular attention to the role of thoracic spiral computed tomography (CT) image and 3D 1modeling of patient with pectus excavatum. Thoracic spiral CT was always performed on patient who had developed restrictive chest walls following pectus excavatum surgery. These patients then underwent a Nuss operation to elevate the sternum and attempt to correct their restrictive chest wall defects. The method used the CT image to set up 3D modeling reconstruction defined the orientation of the ribs and costal cartilages and their relationship to the sternum, allowing exact preoperative measurement of the bony rib cage and guiding individualized operative correction. It also has laid foundation for simulation of Nuss operative correction of pectus excavatum and has important reference value in selecting and positioning of support frame. As was shown in the result, the accuracy of costal cartilage’s model was promoted in certain extent. Manual work of model modification was significantly reduced and the period of 3D modeling was shortened by approximately 40%. The 3D modeling of spiral CT data is useful in both preoperative and postoperative evaluation.

Abstract: This paper proposed a digital audio watermarking scheme based on independent component analysis (ICA) in stereo sound. In order to make full use of the multi-channel characteristic of stereo sound, The watermarking embedded into the two channel, half respectively. Also using the multi-resolution characteristic of discrete wavelet transform, performing 3-level DWT in each channel. Selecting the low frequency coefficient appropriately as the embed location to make sure of the balance between the transparency and robustness. The extraction process is similar with ICA’ s goal, it’s used in extraction makes the scheme simple for implementation. The experiment results show that the proposed scheme has good robustness against common attacks, as well as transparency

Abstract: A double Synchronous Dynamic Random Access Memory controller based on ping-pong operation as the data buffer is designed to meet the requirement of large data amount and high transmission speed for multibus ground-based test equipment of a certain missile system. The design scheme which use FPGA as the main controller is presented in detail, including the internal interface of SDRAM, processings of data transmission and realization of ping-pong operation. The function of this controller is validated through the picked images from image generator, and the result shows that it can write and read data at the steady rate of 125Mbit/s, which indicate this SDRAM controller is feasible for the multibus ground-based test equipment

Abstract: Dam deformation monitoring plays an important role in order to ensure the safety of dam operation, to improve project efficiency and the level of design and construction. Reliable monitoring method and scientific data analysis is the best protection for control the deformation law. Mathematical methods have been used to precisely quantitative analysis the deformation of the dam monitoring points. Usually, when assess the stability of deformation and evaluate the monitored data, qualitative languages are used to analyze qualitative result. The article combines cloud model with reliable monitoring data of Xiaolangdi to try to make qualitative analysis result quantitatively, and the quantitative analysis result can verify the qualitative analysis conclusion. It has realized the change between those two analyses. Also, utilize cloud model to analyzing deformation monitoring data is verified reliable.

Abstract: This paper introduces the present status of speech emotion detection. In order to improve the emotion recognition rate of single mode, the bimodal fusion method based on speech and facial expression is proposed. First, we establishes emotional database include speech and facial expression. For different emotions, calm, happy, surprise, anger, sad, we extract ten speech parameters and use the PCA method to detect the speech emotion. Then we analyze the bimodal emotion detection of fusing facial expression information. The experiment results show that the emotion recognition rate with bimodal fusion is about 6 percent points higher than the recognition rate with only speech prosodic features

Abstract: Three kinds of activated carbons were prepared from Taixi anthracite by NaOH activation. As-obtained activated carbons were adopted as electrode materials to construct asymmetric and symmetric supercapacitors. The electrochemical properties of as-constructed supercapacitors in aqueous electrolyte (3.0M KOH) were investigated. Results show that the asymmetric supercapacitor assembled with activated carbon of a higher specific surface area (SBET) as the positive electrode exhibits better ion diffusion behavior and higher cell gravimetric specific capacitance (Cg). This is different from the case in non-aqueous system, mainly because pseudo-capacitance rather than double-layer capacitance has a more important effect on Cg in the aqueous electrolyte. Namely, the wettability and pseudo-capacitance of activated carbons decrease with increasing mass ratio of NaOH to anthracite, which is more prominent for activated carbons used as negative electrode materials.