Applied Mechanics and Materials Vols. 511-512

Abstract: In the sensor system, the wave in the optical fibers conductivity will change when the surrounding medium is changed. Thus, minor changes according to the mechanical wave, optical fiber can be used to monitor changes in the surrounding environment. The working principle of the sensor system is the signal generator output signal transmitted to a piezoelectric ceramic. Because of the inverse piezoelectric effect of piezoelectric ceramics, conduction of the electrical signals can be converted to mechanical signals. The resulting mechanical wave transmitted to the other end of the piezoelectric ceramic by the optical fiber, and converted to an electrical signal. The proposed system consists of signal generator, a piezoelectric ceramic, fiber optics, oscilloscope. For investigation the performance of the sensor system the external point loading was applied. Results show that the sensor system can be successfully applied to the sensing the force value.

Abstract: Aimed at the application characteristics of the large-scale WSN, a new clustering routing protocol LEACH_CHMST is proposed in this paper. The multi-hop strategy for cluster-heads communication has been introduced instead of the one-hop strategy in LEACH, and a minimum spanning tree of cluster-head is established, in which the routes from all cluster-heads to sink are found.

Abstract: Smart clothing related technology is illustrated. Demands of smart clothing networks (BAN) are low consumption, suitable topology and scalability .Standard to support BAN is IEEE 802.15.6 which is introduced. Properties and comparison of CSMA/CA and T-MAC are presented in detail. BAN is summarized.

Abstract: Traditional wireless sensor network(WSN) technology has localization limitations due to the data-centric characteristic.Therefore, it’s very important to introduce identifier resolution technology and the kernel of using identifier resolution technology is to trace sensor node and get the application information and real time data in WSN.This paper designed a sensor node identifier resolution method of IP-based and non-IP-based WSN,and it gets the sensor node production property information through Internet-based sensor node identifier resolution,while the real-time data and application property of sensor node in practical environment are obtained by WSN-internal sensor node identifier resolution.The process of sensor node identifier resolution is validated to be effective with being applied in the smart home system.

Abstract: The fusion solution is a significant factor for the effect of the cell electrofusion, traditional buffer solution is different from the cell culture solution, researchers would spend lots of time and money to move the cells from the culture solution (DMEM) into the fusion buffer. The aim of this study is to explore a new formula on the basis of DMEM solution instead of Zimmerman solution. Theoretically its feasible to instead of fusion solution when the ratio of DMEM solution and water is less than 9:500.

Abstract: According to the problem of dynamic calibration of the thermocouple, especially impossible to evaluate the rise time and to unify the calibration method, a new method of thermocouple calibration is proposed. Based on the method rise time of the input signal of thermocouple and step amplitude could evaluate accurately. The practical process of calibration shows that the method is effective.

Abstract: According to the records that the too-high temperature rise of equipment leaded to accidents easily, the temperature monitoring system based on ZigBee and GPRS, RS232 technology is designed. The perception layer uses the heterogeneous network topology by adding appropriate heterogeneous nodes to ordinary ones, which are much better than the ordinary in computing power, storage capacity, etc, and this topology structure extends transmission distance. Both of them use CC2530 chips, and the heterogeneous nodes are not only responsible for collecting temperature data, but also responsible for forwarding data from ordinary nodes. The sink nodes send alarm messages to staff by GPRS, and forward data from heterogeneous nodes to a PC via RS232. The system uses Visual Studio for software design to realize the function of data processing, display and storage, in order to achieve real-time monitoring of substation equipment and early warning.

Abstract: Recently data integrity issues of applications based on radio frequency identification (RFID) have drawn great concerns worldwide and many watermarking-based schemes have been proposed. While those schemes can effectively verify if the protected tag data be modified, they also expose both the protected data and the watermark to any adversaries. In this paper, we present a zero-watermark scheme, which stores the watermark not in part of the data fields of RFID tags but in the back-end database system or that of a trusted third party without any modification of the original RFID data. The novelty of this zero-watermark scheme lies in the fact that we extend the zero-watermark technology to the RFID tags and the use of data tampering from the limited applications of copyright protection of digital works. We term this scheme ZMark-TamDetect because it is a tamper detection solution using zero-watermarks, which is so designed that it can be easily plugged into existing RFID middleware applications. This proposal is one of the first works that integrates zero-watermark and RFID technologies together and it provides a detailed theoretical foundation for the ZMark-TamDetect.

Abstract: Static and dynamic tuning characteristics of Distribute Feedback (DFB) diode lasers are investigated with practical laser devices. These characteristics are the basic guidelines for practical TDLAS sensors design. Static tuning characteristics help to select suitable diode lasers from limited available laser devices with specific wavelength and to set an appropriate working current and temperature. Dynamic tuning characteristics decide the sweep speed of current slope in both direct absorb Spectroscopy (DAS) and wavelength modulation Spectroscopy (WMS). Because of nonlinearity in the relation between wavelength and tuning current, the measured spectral line position should be corrected by the dynamic characteristics. For WMS, current tuning efficient and IM/AM (Intense modulation/Amplitude modulation) differential phase could be utilized to optimize laser modulation and harmonic components demodulation.

Abstract: The optical structure and working principle of reflection structure fiber optical current sensor was presented, the Jones matrix of Polarizer, wave plate, fiber optical sensor head, theoretical mathematical model of the reflection structure fiber optical current sensor were established. based on the theoretical mathematical model, the polarization error was simulation analyzed, the simulation result shown that to be improve the accuracy of fiber optical current transformer, it should be reduced the polarizer axis angle error, ensure the consistency of the phase modulation for the two beams light, the shaft angle of the wave plate should be controlled within 0°±2°,and phase delay should be controlled within 90°±3°, the influence of linear birefringence effects can be effectively restrained by using a large number of circular birefringence. The simulation results provide a theoretical basis for the realization of reflection structure fiber optical current sensor.