Applied Mechanics and Materials Vols. 490-491

Abstract: Twelve vinegars from different production areas in China were evaluated by the Portable Electronic Nose 3 (PEN3), and the data detected by PEN3 were analyzed by principal component analysis (PCA), linear discriminant analysis (LDA) and loadings analysis (LA). The results of PCA and LDA all showed that the electronic nose could clearly discriminate the vinegars of difference production areas, but had very little discrimination on same production area vinegars. The results of LD showed that these sensors, including W1S, W2S, W5S, W2W, W1W, W5C, were appropriate to evaluate and compare the aroma of vinegars, especially W1S, W2S, W5S. Loadings analysis also indicated that these compounds in twelve vinegars had great differences, such as acids, esters, alcohols, alkanes, while aromatics compounds, sulfur-containing compounds and alkenes had some distinctions.

Abstract: In the paper we discuss the problem of fuzzy duplicate detecting. There are given the basic approaches to detection of text duplicates. We review the existing methods of fuzzy duplicate detecting. There is presented algorithm of fuzzy duplicate detection. Algorithm is based on method of shingles. We describe modification of algorithm. We propose to consider not all text of document but its processed and filtered copy. There is presented the structure of system for fuzzy duplicates detection. System checks text duplications in the internal database and in Internet.

Abstract: Aiming at the problem of low accuracy, low efficiency in the parallelism measurement of porous workpiece, this paper proposes a parallelism measurement method based on computer vision technology. The images of both ends of the workpiece are acquired, after camera calibration, image distortion correction, two sides coordinate unification, filtering, edge extraction, circle calculation and a series of image preprocessing, parallelism can be calculated. The experiment shows that this method has high precision, high efficiency and it is simple to operate, it provides a new way for geometric measurement.

Abstract: For wide range defect detection in plate, acoustic beam optimization technique was investigated. The synthesis wave field obtained from the basic phased-addition is prone to be influenced by the noise and the resolution is low. To improve the performance of beam forming of array, the synthesis acoustic field is processed with amplitude weighting. The experimental data have been processed with phase shift and amplitude weighted optimization. It is shown that the proposed beam forming technique with transducer array can recognize the features in plate.

Abstract: In recent years, more and more class-A surfaces are adopted for product processing, both in the traditional industries and new industries, which proposes high requirements for the detection technique of product. This article describes the method of size detection in detail. Combining with the principle of reverse engineering, the XJTUOM and XJTUDP systems are used for the 3D digital measurement and design of the large sculpture. The digital detection technology combined with computer aided tools will have a more widespread and profound application in reverse engineering.

Abstract: During the development of vehicle transmission system, in order to obtain operating state of transmission system, thoroughly study control scheme of transmission system, it needs to acquire, save, display parameters such as torque and speed of shaft. The measurement principles of torque and speed were analysed. A portable measurement system of torque and speed based on virtual instrument was designed, which can be used to measure toque and speed conveniently and accurately. Vehicle experiments were carried out using this system. It shows experimentally that the system has high accuracy and good anti-jamming ability, and the operation is simple. The system can quickly show the dynamic and static characteristics of vehicle shafts operating state and describes directly with the graph form.

Abstract: Automobile auxiliary brake, also known as retarder, is the key equipment to ensure the safety of automobile driving. Its operating quality which is guaranteed by a perfect test system and good test equipment has always been playing an important role. Studies on the test system of miniature vehicle-mounted retarder should be carried out, in order to make it easier to simulate its actual usage and environmental conditions, and also make it more authentic to reflect the properties of magnetorheological fluid retarder. In this way, the research and development level of magnetorheological retarder can be improved, the development cycle can be shortened which leads to the enhancement of brake technology; the test technique of the the magnetorheological retarder and the test level of test bed can also be improved which has a very vital significance to the research and the quality assurance of magnetorheological retarder products and the development of the vehicle braking performance.

Abstract: With the rapid development of radio and television industry, the use of software to improve the security of broadcasting and TV system by monitoring the radio and television equipment is becoming widely adopted, So how to improve the authorization management model of software to meet the need of detailed sub-division of authority and dynamic authorization becomes the focus of the industry and has practical significance. This paper first introduces the design concept, module composition of the radio and television integrated monitoring and management system (RTIMMS). In the second place, this paper reviews advantages and disadvantages of the most frequently used models including Role-Based Access Control (RBAC) and Task Based Access Control (TBAC). By researching and comparing two models above, the paper presents a mixed model called (T-RBAC) and divides tasks in two categories and related events respectively. The process of authority management is based upon the tasks, rules in rule base and usage count of permission. The diagram of T-RBAC authorization model is also introduced in the end.

Abstract: Tourmaline is a kind of non-metal mineral, which has been applied widely in environmental protection, such as radiating infrared, producing ion negative and shielding electromagnetic radiation. It is proved that tourmaline has the properties of spontaneous electrode effect and weak magnetism. Tourmaline from different areas has some differences on internal crystal structure and chemical composition. This paper studied on the infrared radiation properties of four different kinds of tourmaline produced in Hebei Guangxi, Henan, Xinjiang. Our experiments indicated that different species of tourmaline has different rate of infrared radiation on the same condition, and infrared radiation rate changes with temperature and particle size.

Abstract: A fast Hough transform for circular object detection is proposed in this paper which can be directly applied to gray level images. This method consists of three major stages. In the first stage, the center positions of circular objects are detected using the gray level Hough transform, which requires no conventional preprocessing such as edge detecting and binarization. The second stage determines the radius of the detected objects by analyzing the radial gradient profile. In order to detect objects with different radius in the same scene, a multi-scale strategy is integrated in the proposed method. Compared with traditional Hough transform, the gray level Hough transform uses a 2-dimensional accumulation map rather than the 3-dimensional one, which results in a dramatic improvement on the computational efficiency. Experiments have been carried out on more than 2000 real-world images and the result shows that 90.3% of the circular objects have been accurately detected, which demonstrate the applicability of the proposed method.