Applied Mechanics and Materials Vols. 58-60

Abstract: Traditional pulse infrared thermography uses a single pulse with high energy to heat the specimen. For deeper or smaller defects, more energy must be conducted into the specimen to improve the detectability, which also may cause thermal impact damage in particular for composites. Consequently, multi-pulse heating was presented in this study to solve the problem. The multi-pulse is based on heating the materials with two or more pulses separated by a proper time. In this way, more energy can be conducted into the object as well as every pulse thermal impact was separated. Simulation results show that multi-pulse method can not only enhance the defect detectability several times but also is effective to avoid thermal impact damage by restraining the maximum temperature. Ultimately, the optimum separation time for multi-pulse was chosen according to the best inspecting time of single pulse which was estimated by a very simple method.

Abstract: Service Learning is a teaching and learning strategy that integrates community service with academic instruction and reflection to enrich students further understanding of course content, meet genuine community needs, develop career-related skills, and become responsible citizens. This study focuses on a case study of service Learning through Information technology in college of China to improve students’comprehensive ability and inspire innovation ability. The study takes the qualitative research to probe into the practical feasibility and effectiveness of service learning by IT

Abstract: The high-medium voltage level distribution networks have their own characters. Because of the radiation characteristic of the network, this paper looks on the network as the combination of some small optimization unit. The paper simplifies the resolution of the reactive power optimization by the way of alternatively solving the adjusting transformer taps and switching capacity banks. At the same time, considering the practical operation request, the paper evaluates the regulation effect and improves the practicability of the software.

Abstract: At present, road transport safety issue has become increasingly prominent. Reasonable transport safety evaluation is an effective way to enhance enterprise safety management level, decrease traffic accidents and construct harmonious transport environment. In this paper new evaluation method named Fuzzy Comprehensive Evaluation (FCE) based on control criteria is put forward, evaluation criteria architecture is built, and G₁ method is introduced to identify criteria weight. Finally a road transport enterprise in Sichuan province is studied to prove reasonability of the method.

Abstract: Adopting computer technology for building virtual prototype model of special electromechanical device. After analysis and evaluation for structural form of that device, we find out the means and measures of optimization design. Take the advantage of that virtual prototype don’t limited by virtual experiment test length like physical prototype, there is no need for manufacturing and testing the physical prototype and we can acquire optimum design plan. To sum, we choose virtual prototype model in design electromechanical device can shorten the period of study and development electromechanical product effectively and improve design quality of electromechanical product conspicuously.

Abstract: The electronic ignition system for special electromechanical device is composed of control module, analog switch circuit, ignition driver module and ignition module. The key point to make the system work quickly, real time, safety and accurately is the hardware design. Study on electronic ignition circuit design for special electromechanical device considering security design is employed to effectively increase the reliability and safety performance, which corresponding design idea and technical way can lay a theoretical and technical foundation for subsequent research.

Abstract: This paper proposes rapid extraction algorithm for identifying the main direction of smoke, according to internal small local movement feature of initial rising smoke and the overall presentation presents upward and both sides diffusion trend. The algorithm adopts Meanshift Kernel function of histogram to model movement characteristics and estimates the smoke pieces of motion vector direction by using Bhattachyarya coefficient. Smoke data block motion accumulation are analyzed statistically to estimate the proportion of each suspected smoke region in main movement to realize the identification of inside smoke moving direction. The obtained results from the thick black smoke experiment, gray smog experiment, human body movement interference experiment show that the algorithm is better able to extract the main direction features of smoke and has a strong ability to eliminate interference. It provides criterion for the further study of smoke recognition algorithm.

Abstract: According to the fire burning features, this paper proposes a low-power fire detection algorithm under complex background. In this algorithm, adaptive statistical background features are used as the basis for background suppression to remove the background image effectively and local accumulation area method is used to eliminate interference and identify areas of fire flames. The algorithm solves a difficult problem that low-power fire detection in video sequences which exists in complex background and low SNR is difficult to get. The experimentation results show that under the condition that the image resolution is 400 × 300, the algorithm proposed in this paper can identify the flame within 100 pixels with algorithm response time less than 7s, recognition rate more than 90% and false positive rate less than 10%.

Abstract: This study is devoted to engine application of bio-diesel manufactured by transerification reaction with alkali process from waste cooking oil. The performance & pollutant emission of vehicle engine application are little different in the idle condition for the engine test of the garbage collecting trunk with PD (practical diesel), B20 (20% biodiesel mixture with diesel) and B100 (100% biodiesel). In the full loading condition, the pollutant degree is decreased obviously with the addition of biodiesel especially for full alternative B100 for PD. The CO emission is down 51%, the SOx emission is down 73%, the NOx is down 13%, and, the carbon participate emission is down 69% in this test. But, the decreasing motion horsepower (down 10%) and the increasing fuel consumption (up 11.3%) are the evidences that the above effect is focused on the healthy to the environment only.

Abstract: Introduced various preparation method of one dimensional nanowire and the merit and shortcoming of various methods, adopt two anodic oxidation method carry on oxadation to the aluminum sheet and Fabricate thickness about 15 ums, 50 nms nanohole diameter AAO template .In the H₂PtCl₆·6H₂O+H₃BO₄ solutions carry on electrochemistry deposition to the AAO template.The deposited templates were characterized by scanning electron microscope (SEM ) , approval that growth speed of nanowires are the 1 um/h.After had electrochemistry deposited for 12h, the nanowire can pierce through AAO template.The length of nanowire is 15 ums, diameter is 50 nms. Nanowires are independent, they meet demand as conducting nanowires.