Applied Mechanics and Materials Vols. 20-23

Abstract: In space engineering, pyroshock (or pyrotechnical shock) environments induced by pyrotechnical devices are severe for space hardware, especially the inner electrical components. Thus pyroshock responses need to be well considered in the design and manufacture of a space structure or system. Because of the lack of efficient analytical technique, laboratory tests are of importance at present. This paper experimentally studies the pyroshock responses of a conical aeroshell. Two experiments were performed by ignitions of true pyrotechnical devices. A number of acceleration histories were measured and the corresponding shock response spectrums (SRSs) were analyzed. The results show that the responses, not only in time domain but also in frequency domain, have significant decaying characteristics along the axial distance from the pyroshock sources. The quantitative results provide us a good understanding of local environments for design of the components and the corresponding installations.

Abstract: In order to research the forming mechanism lateral bending during side pressing for continuous casting slab, the simulation model was established using finite element method. It is mainly studying object for the effect of the different position of double dies on the lateral bending, to make nodes displacement fluctuation in corresponding position of slab head and tail as the degree of lateral bending of continuous casting slab along its width direction. It can obtain the rules of metal flow along the rolling direction, when dies position deviation respectively is 0 mm, 10mm, 20 mm, 30 mm, 40 mm and 50 mm, under the other conditions remain unchanged, the bigger the dies position deviation, the bigger the corresponding pitch nodes displacement, and the bigger the lateral bending for slab. The results provide the theoretically support for the controlling position accuracy of the dies in live and enhancement the useful rate of the slab for production field.

Abstract: In this paper, we have presented our circular polarization antenna for the RFID system, which was presented by us. The focus of this contribution is on analyzing and comparing the antenna performance for the 900MHz RFID application. As a result of performance test of the antenna designed, it was found that return loss (S11) was about -41.633dB at 914MHz, which was relatively small, and antenna gain was about 5.69 ~ 9.59dBi. And it was confirmed that 50Ω impedance matching was about 49.20Ω and it can be applied for every RFID system. Therefore, the antenna was designed to have higher gain of circular polarization antenna by improving the reception which is one of the most important parameters of the RFID reader, which is expected to be extensively used to recognize multi-tag in the distance.

Abstract: Perception video sequences quality metrics are of great potential benefit to the video industry, as they promise the means to evaluate the performance of acquisition, display, coding and communication systems. Many researchers have focused on developing digital video sequences quality metrics which produce results that accurately emulate subjective responses. However, to be widely applicable a metric must also work over a wide range of quality, and be useful for in-service quality monitoring. We have developed novel video distortion metrics for video sequences. The temporal correlations of video frames and the visual interest feature are considered in this method. Meanwhile the metrics are capable of capturing spatial distortions in video sequences. The metrics correlate well with subjective video transmission quality measures because perception distortions of human were took account of. Results are presented that demonstrate our perceptual quality metric performs better than existing methods.

Abstract: Body shape analysis module is an important part in the e- Measure to Made. In this article, we discuss the body shape analysis approach based on fuzzy particle swarm optimization clustering algorithm.First we extract parameters features of the body shapes in body shape database which obtained from 3D scanner. Then fuzzy particle swarm optimization clustering algorithm is implemented to classify these body shapes and the clustering results are obtained.The results show it’s a effective method.

Abstract: An efficient approach to solve scalability problem of current inter-domain routing system is to separate the edge network from the core network address space. But the approach based on core-edge separation needs a new mapping service system to distribute transition information between core and edge networks address spaces through Internet. And after separating and mapping, it needs a method to ensure it is backwards compatible with the current addressing and routing architecture. Aiming to the problem caused by mapping service and compatibility, this paper proposes a scalable inter-domain routing architecture, called SIRAS. SIRAS reuses IPv4 address space to ensure backwards compatibility, and avoids introducing a new mapping service system by extending existing DNS and protocols. The analysis shows SIRAS efficiently alleviates scalability pressure without introducing a new mapping service and protocol.

Abstract: Nano ZnO is an important kind of semiconductor materials, and it has been widely used in various single detection fields. In this paper, we prepared nano ZnO powder through direct precipitation method. We fabricated temperature sensor utilizing the interdigitated Au electrodes drop-deposited by nano ZnO powder. The response of the sensor to temperature was studied by CHI660 electrical chemical workstation. The results proved that the temperature sensor based on nano ZnO material presented sensitivity and repeatibility

Abstract: Successful business intelligence application used by an enterprise often produces a very high return on investment. This paper introduces the application of best practices to business intelligence infrastructure with SQL Server 2008.

Abstract: Together with Finite Difference Method, The sequential function method set up a mathematical model for inverse heat transfer problem, solving interface heat transfer coefficient for water cooled metal. Discussion on results indicates that the selection of time step throw striking influence on the evaluation accuracy, especially when the surface heat transfer coefficient experiences a drastic variation. A proper value of time step is confirmed to be 0.01s, where lies comparatively an acceptable error, being 0.37%.

Abstract: This paper introduces a WSNs architecture design applied in remote monitoring of power towers. First, the system general design is presented. Second, design of nodes is given in detail including cluster-head, normal node and sink. Third, a fast change detection algorithm based on DC statistic is described, which can reduce the number of repeated image. Last, a clustering routing protocol C-LEACH with its application in power towers monitoring is discussed. The techniques described in this paper can provide scientific basis for state maintenance of power system equipment.