Applied Mechanics and Materials Vols. 58-60

Abstract: Electrical performance of bonding wire is critical to the reliability of electrical interconnection systems of chip-level packaging for high frequency operation. In this paper, the electrical performance of various bonding wires between chips and packages is presented. The impact of the length, spacing, height and diameter between the bonding wires was carefully examined. In order to investigate the impacts of bonding wire configuration parameters on signal transmission performance, a design of experiment (DOE) was set up. Based on data of DOE, two parameter equations were obtained to express the Radio Frequency characterization of bonding wires. From these equations, the optimized geometric structure parameters were obtained by optimization design. Compared with the previously reported geometric structure, the optimized geometric structure has better electrical performance, making the return loss and coupling decrease 3dB and more than 10 dB, respectively.

Abstract: A hybrid manufacturing system which consists of two machines is examined. Unreliable buffers and multiple stochastic failure modes of the machines are introduced to the system. A new method of the system performance evaluation is presented. The states of the system are analyzed in detail based on a discrete model and a new solution technique is given to determine the state probabilities. The method can be used to analyze the cases arising from two or more stochastic events or longer (or more complex)production lines. Numerical results are also offered to testify the method and show some characteristics of the system.

Abstract: In this paper, the composition and structure of typical microgrid system are described briefly first. Different control methods of microgrid system and their advantages and shortcomings are analyzed in detail. The comparative analysis of different control methods is carried out. Finally, a practical control scheme of an example is proposed which provides a reference for related research and engineering practice.

Abstract: This paper proposes a new monitoring system of power quality, which is combined with the technology of wireless data transmission of SM5X and intelligent instrument. Hardware configuration and software design of the system are also described in this paper. Based on the monitoring system, remote monitoring of power quality parameters, condition diagnosis and alarm can be achieved. This system has been successfully used in copper smelting industry, which proved its stability and excellent scalability. It provides a new idea which improves the cost-effective of remote multi-point monitoring system of power quality. In addition, it also provides a platform to verify the validity of the reactive power compensation device.

Abstract: This paper describes a new type of intelligent liquid-level monitoring system, presents the measuring method and principle, and also goes to details on how to transform liquid-level signal into pulse signal which can be recognized by the microchip. Because two methods in calibration have been adopted in the system, including software and hardware, the problems caused by different liquid medias have been eliminated, at the same time, the precision of the measuring system has been improved, realizing liquor intelligent measurement. At last, the liquid level measured can be read and printed very easily and the function of real-time online monitoring is achieved.

Abstract: The problem which people are following with interest all the time is how to improve the cutting properties and natural life of cutter. The feasible experimental analysis is done for Al₂O₃ ceramics inserts. The technique of N⁺ ion implantation is adopted in the experimentation, the practical formulae of cutting force are set up, and the cutting properties of inserts are compared and analyzed. An effective, simple and convenient method for changing the surface properties of inserts is obtained. All the tries are achieved with the aim of property melioration for ceramics inserts.

Abstract: With the fast development of internet, especially the emergence of SaaS, the majority of SME (small and medium-sized enterprises) customers found that the costs of Software application are reduced and its maintenance is easier. These are definitely new challenges which the SaaS model brings to the management of data security. So we need to find out the corresponding strategies to guarantee the high quality of software service. This paper presents a solution that store the data encrypted by the client’s public Key on Server which protected the data is abused by server administrator.

Abstract: Studies on touch screen mainly focus on modalities of input, but the effect caused by environmental parameters has not been studied seriously. In this paper, we designed two experiments that can be used to investigate: whether pen-based input operation can be affected by tilt angle of touch screen, and at which tilt angle of touch screen can user do input operation with comfort, quickness, and accuracy. The experiments we designed include pointing tasks (1-dimensional and 2-dimensional) based on Fitts’ law and stroking tasks (linear and circle) based on Steering law. Each task would be done under 6 kinds of tilt angle of touch screen: 0, 15, 30, 45, 60 and 90 degrees.

Abstract: In this paper, the effect of laser radiation on the germination percentage and growth of soybean seed is introduced. The experimental result demonstrate that soybean seed various measurement value is optimum when the soybean seed was irradiated on the seed hilum for 10 minute, using He-Ne laser of 5mw. And the experimental results is also most significant when the soybean seed was irradiated on the seed hilum for 90 second, using He-Ne laser of 40mw. It is founded the experimental data is not significant if the dose of He-Ne laser is less and soybean growth is restrained if the dose of He-Ne laser is more. This shows proper dose of He-Ne laser of soybean seed conducted radiation, promoted soybean seed enzyme activity enhanced, its germination process, the nutrient supply full, thereby improving the soybean seed germination rate, soybean seedlings plant height and chlorophyll content. The results offer us a reference for laser radioactive breed and Laser Biology.

Abstract: In the experiment, a new non-destructive method for discriminating three vigour of soybean seeds was developed by near infrared spectroscopy (NIRS) combined with principal component and Mahalanobis distance model. The result show that NORMALIZE was the best pretreatment method of NORMALIZE, MSC, First Derivative and Second Derivative, the ideal spectral acquisition range of Soybean seed was 4000cm^-1～6900cm^-1, the cumulative contribution rate of the front four principal components reached 99.82%, it established the best model. The model could successfully complete the calibration samples and identify the prediction sample. This study proved that the use of near infrared spectroscopy combined with pattern recognition methods to rapid and nondestructive determination of seed vigor was indeed feasible. This study will offer a new method of testing soybean seed vigour with quick, non-destructive characters.