Applied Mechanics and Materials Vols. 55-57

Abstract: The storage security technology in cloud storage applications was analyzed, and in order to satisfied the demand for privacy protection, the key technology of data encryption and authentication are described and the methods of privacy protection in data mining under the cloud were discussed. At the same time, a hierarchical mechanism of authentication was proposed. These methods and mechanisms could solve the problem of privacy protection in a certain degree, and ensure the security of cloud storage.

Abstract: In the current study, a high precision polishing process test bench with in-situ measurement technology was developed. The test bench also adopted to investigate the effects of operating parameters on polishing interfacial phenomena during the polishing process with IC1000 pad. The experimental results coincide with the experimental and theoretical data published previously results. The developed test rig and the current experimental outcomes contribute to the understanding of soft pad polishing mechanism.

Abstract: The devious but steady increase in the price of petroleum along with concerns about emissions of greenhouse gases, presents renewable energy sources as promising solutions. So, either enterprises or research institutions zealously take part in new energy automobile development for more and more serious energy and environment problems. Whatever, variable and dynamic loads are required in order to satisfying variable working conditions in the electric vehicle (EV) experiments of the traffic. The scheme of power electronic impendence converter which adopts bi-direction DC-DC topology base on ultra-capacitor (UC) is brought forward to satisfy bi-direction power train in experiments. When UC is charged, the system is look upon as positive load. On the other hand, if UC is discharged, the system is look upon as negative load. Impendence converting can be implemented by controlling converter’s duty cycle and operating condition. Then, the load torque is simulated by changing the variable load’s value. At last, the experiments show that the scheme is feasible and cost-efficiency.

Abstract: Proton Exchange Membrane Fuel Cell (PEMFC) has being widely applied in electric vehicle and distributed generation for its low corrosion, low-temperature operation and environment friendship. It should be concerned over the control and maintenance of its auxiliary equipments, placement site, restoring of hydrogen and other things when physical PEMFC is used. However, PEMFC’s volt-ampere (V-I) external characteristics draw our more attention rather than its ontology or peripheral devices control which keeps PEMFC working properly in many appliance studies. So, there is another solution to introduce power electronic technique to construct a FC power electronic simulator which simulates FC’s external characteristic including static and dynamic states and keeps away those troubles mentioned above. A buck converter is adopted to construct the FC simulator. The test DC current source load is acquired by a buck converter which main circuit is similar to the FC simulator. The experiments show the FC simulator has done a good job to simulator FC’s volt-ampere external characteristic and it is cost saved.

Abstract: Centering round obstacle avoidance problem, an evadible system based on the ultrasonic sensor Sens600 is presented in this paper, the sensor rotated by the stepper motor scans back and forth in horizontal plane ahead of the robot, then the system builds and updates a histogram world model with the to-and-fro range information after data processing, the safe area capture (SAC) method is applied to compute the most suitable direction among all candidates, and the steering of the robot is aligned with that direction. The experimental results demonstrate the feasibility and effectiveness of the proposed system.

Abstract: In this paper differential evolution algorithm (DE) which is a new global optimization algorithm is introduced into the displacement back analysis, and the self-developed back analysis program based on DE is used in metro station engineering. The results show that the superiority of DE and the practicability of intelligent displacement back analysis program, more importantly, it is being applied to engineering practice to provide reference and advanced prediction for the construction process.

Abstract: Cereals is one fundamental factor about people's livelihood. Relatively abundant food production, to maintain a certain number, variety and quality of food reserves, directly related to national security, social stability and economic development. Maintain a certain amount, variety and quality food reserves, which is essential to ensure national food security measures. Cereals reserve and quantity monitor is a key element for food security strategy. However, most of the granaries were built many years ago, outdated facilities, technical means backward in China and many other countries. Access depends on the number of grain of experience and estimation. As different varieties of grain, place of origin, degree of packing, texture, moisture content and shelf life of different, the estimated cereals quantity data using traditional methods and real data usually have a large deviation. This restricts the development and implementation of national food security strategy. Fortunately, with the rapid development and wide application of modern information technologies, they are rapidly penetrated all aspects of grain fields and applications. Food safety system has been extended to modern technology, management and information technology and network support integrated system, and gradually developed into a warehouse as the mainstay and the main form of processing and production, related to transportation, storage, processing, circulation and consumption the whole process of information systems. Modern information technologies improve accuracy and reliability of cereals weight measure. In this paper, a cereals weight measure system combining of the new types sensors and communication technology is used in food granary. Vibrating wire pressure sensor is deployed in the bottom grain storage in advance, and then began to store grain silos. The sensor signals are sent to collection device or monitoring the background. Background calculates the weight of grain storage silos by the received data. Pressure sensor can accurately obtain the food and the weight of cereals can be scientifically obtained.

Abstract: Obstacle detection in the intelligent vehicle vision navigation system occupies a very important role. The studies for the obstacles detecting, especially Monocular Measurement from the computer vision, simplifying monocular vision system to camera projection model. Getting the conversion relation between image coordinate and the world coordinate system through the geometry derivation to establish the measurement model and achieve the obstacle measurement. The experiment proved that the error of this measurement model selected is within the acceptable range.

Abstract: By means of the hypergeometric series method, the explicit expressions of energy eigenvalues and eigenfunctions of bound states for a diatomic system with a hyperbolic potential function are obtained in the one-dimensional nanomaterials. The eigenfunctions of a one-dimensional diatomic system, expressed in terms of the Jacobi polynomial, are employed as an orthonormal basis set, and the analytic expressions of matrix elements for position and momentum operators are given in a closed form.

Abstract: Three-dimensional model of the parts of the extrusion extruder for leisure food is created as an illustrator, which could be adopted up to form an assemble facility to the whole set of the machine conveniently by a software of SolidWorks in the paper.Some key specific modeling procedures are proved to show the advantages of Solidworks overweigh AutoCAD in three-dimensional modeling technology. The method put an adaptable way to short the whole lifetime of industrial product design.