Applied Mechanics and Materials Vols. 713-715

Abstract: Study Objective:The concept of isokinetic exercise was first proposed by Hislop and Perrine. Cybex Company of the United States created the first isokinetic muscle strength training instrument in the early 1970 s, after then many countries in the world has begun the application and research of the isokinetic muscle testing, and all acknowledged that it is a major innovation in the field of muscle strength testing and training. The isokinetic muscle strength test can evaluate the muscle characteristics under different contracting such as contraction centripetal and centrifugal contraction.

Abstract: In the present study, the effects of ventilator geometries on the its performance were numerically simulated using the computational fluid dynamics (CFD) program. For a certain type ventilator, three-dimensional inner flow field was derived firstly, such as local flow field at the meridional and rotary plane of ventilator, the gap flow between the impeller and air outlet, and the secondary flows in impeller channel were studied in detail, and some suggestions are given to improve the profile of velocity. The above results would be helpful to the optimization and modification of ventilator.

Abstract: In order to obtain better surface quality for swear parts of machine tools, the laser alloy cladding technology is used. The two alloy powders are laser cladded on axis parts separately, which is under different process parameters, such as laser power, feed rate and scanning speed etc. The microstructure and hardness of cladding layers are analyzed by using scanning electron microscope and hardness tester. Generally, the surface quality is improved apparently. Under the similar laser power and powder quantity, the thickness of Ni60 cladding layer is much larger than Fe60. The hardness of Ni60 layer is higher than that of Fe60, while both of them are all higher than 45 steel substrate. In conclusion, the parameters of sample 2 are optimal.

Abstract: Road dust is an important part of the atmospheric particulate pollutants, which has become one of the important factors influencing the quality of our environment of the city. Espescially in the northern city. The air particles contributes more than 50% in the road dust. Particle diameter of the particles below 10um is the greatest harm to the health of human beings. At present, the city of this control mostly adopt sprinkler, manual cleaning and other traditional way. The dust removal effect is not significant and cost a considerable human, material and financial resources. So this paper quotes the electrostatic dust removal principle of thermal power plant to design a new type of device used in road dust cleaning. Its energy consumption is small, high absorption efficiency. The influence of automobile driving resistance is small. To be located in the rear of the car, it will complete the whole removal process in automatic car running. Do not need to complete the staff involved, greatly saves manpower cost. It also can suck tiny particles in addition to PM10, PM2.5 and so on, can greatly improve the city's air quality.

Abstract: In this paper, through the introduction of working principle of the existing CT and the composition, the causes of image artifacts are analyzed in detail. On the basis of the examples, the paper expounds the methods to avoid image artifacts, providing a theoretical guidance for the future technology weapons testing.

Abstract: All over the world, statistics show that forest fires rate has increased in the recent decades despite the numerous studies and various indices developed to predict high risk of fire occurrence. In this paper, a new proposal for a fire detection index is presented that combines between meteorological and topographic parameters. The parameters of slope, aspect and elevation are introduced and their impact on fire behavior (ignition, spread & intensity) is described. The method of calculation of the new index is based on simple logic gates. A comparison is then held between the proposed index and seven commonly used existing indices. The accuracy percentages are calculated which reveals the distinction of the new combination over the present models, taking the Lebanese data into study. In order to verify the efficiency of our proposed hybrid index, several informative experiments are shown.

Abstract: For the problem of attribute importance measure, basing on the decision information system, and according to the characteristics and shortcomings of the existing measure modes, we discussed the associated features between the lower and upper approximation of decision classes and the knowledge in system. Then, we constructed an attribute importance measure mode based on the knowledge change rate, and analyzed the features of the constructing measure mode from different angles. Theoretical analysis and example calculation show that the established mode is a supplement and perfect for the existing measure modes, and it not only can effectively use the existed information to reveal the associated features among each attribute, but also have a good structural characteristic and strong interpretability. It has a broad application prospect among information fusion, fuzzy decision, comprehensive evaluation and so on.

Abstract: This paper presents a technique for processing Terahertz radar reflector by SPDT (Single Point Diamond Turning) based on LODTM (Large Optics Diamond Turning Machine). This technique applies single crystal diamond cutting tools for ultra-precision machining, and thus could obtain high-precision optical mirror, which could be used as the Terahertz radar reflectors. An experiment for aluminum sample had been done to demonstrate the availability of the technique, and a pair of Terahertz radar reflectors were obtained. The precision of the reflectors, detected through precision coordinate measuring technology, was better than the designed requirement. The experiment results showed that Terahertz radar reflectors generated by deterministic ultra-precision machining technique based on LODTM would have advantages in figure accuracy and roughness and so on, which could be helpful to improve the precision and low the cost of Terahertz radar system.

Abstract: Multimedia sensor network is regarded as a brand-new information acquisition and processing technology. It pays more attention to acquisition and processing of audio, video, images and other media with large data size and large information content compared with traditional sensor network. The network has broad application prospects. In the paper, intelligent warehouse monitoring system based on multimedia sensor network integrating multi-sensor sets, distributed processing and event-triggered monitoring is designed and developed. The system is based on construction of wireless sensor network and video monitoring network. Wireless sensor network is established by scalar sensor nodes by using IEEE 802.15.4/ZigBee protocol, and it is responsible for collecting and processing scalar data, and transmitting results to sink node. Video monitoring network is composed of multimedia sensor nodes by using Ethernet. Monitoring data, compressed video/audio streaming and other multimedia data of sink node on wireless sensor network are sent to the monitoring center and users. The system can better provide warehouse environment parameter monitoring, event-triggered or continuous remote monitoring functions.

Abstract: A planar capacitive sensor is designed for security detection. The different length of the sensor electrodes are design and the experiments are presented. For the relations between sensor structure parameters and the sensor potential distribution, detailed analyses are presented and the qualitative conclusions are discussed. The signal strength and measurement range of the sensor can be improved by enlarge the length of the sensor electrodes. The experimental results indicate that the sensor is more portable, easy to minimize, and applicable to the detection of a variety of sizes of containers. It is feasible to be applied to security detection.