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Experimental Research on Antiscale and Scale Removal by Ultrasonic Cavitation

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Journal of Thermal Science 2009年第1期18卷 65-73页

作者： LI Hong-xia,HUAI Xiu-lan,CAI Jun and LIANG Shi-qiangInstitute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing,100190,China Professor Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing China

Aiming at the scale problem in heat-transfer equipments, experimental investigation on antiscale and scale removalby ultrasonic cavitation is performed. By means of microscopic magnifying photography system, thesedimentary phenomenon can be observed. The experimental research reveals the influencing rule of acoustic intensity,cavitational distance, liquid temperature and solution concentration. The experimental results indicate thatliquid temperature has different effects on antiscale and scale removal. Different experimental liquids are used forantiscale and scale removal experiments. The results show that every liquid has a respective Cavitational activetemperature. When ultrasonic is used for antiscale, the smaller acoustic intensity is, the better effect is. But, whenultrasonic is used for scale removal, acoustic intensity has a reverse influence. In addition, biggish solution concentrationis propitious to antiscale for long-time running. Distance of test sample to ultrasonic transducer alsohas certain influence on antiscale and scale removal. The smaller the distance to ultrasonic transducer is, the bettereffects antiscale and scale removal have.

关键词： ultrasonic cavitation acoustic cavitation antiscale scale removal acoustic intensity

Sensitivity and detection limit of dual-waveguide coupled microring resonator biosensors

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Chinese Optics Letters 2009年第7期7卷 598-600页

作者：夏志轩易华祥陈曜周治平 Wuhan National Laboratory for Optoelectronics School of Optoelectronics Science and Engineering Huazhong University of Science and Technology State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University School of Electrical and Computer Engineering Georgia Institute of Technology

We show that a linear relation exists between the device sensitivity and the quality （Q） factor of a dual- waveguide coupled microring resonator optical biosensor when the optimal conditions are satisfied. We also show that the detection limit depends on the loss coefficient and signal-to-nosie ratio （SNR） of the overall system, rather than the circumference of the ring. For a microring resonator sensor whose Q factor is 20000, the detection limit is found to be about 10-7 with 30-dB SNR, which is in good agreement with reported experimental data. These results indicate that loss reduction is the top priority in the design and fabrication of highly sensitive microring resonator optical biosensors.

关键词： acoustic intensity Optical resonators Signal to noise ratio Signal transduction Waveguides

An algorithm to solve autocorrelation matrix singular value based on SNR estimation

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Optoelectronics Letters 2009年第1期5卷 41-44页

作者：赵继军张曙光赵文玉 College of Information & Electronic Engineering Hebei University of Engineering The Insititute of Telecommunication Transmission Ministry of Information Industry of China

SNR estimation of communication signals is important to improve demodulation performance and channel quality of communication system,thus it is an important research issue of communication *** to the core problem of autocorrelation matrix singular value in SNR estimation process,through making use of householder transforming autocorrelation matrix into tridiagonal matrix,and by using the relation of corresponding characteristic equation coefficients and singular value,a numerical algorithm is gi...

关键词： acoustic intensity Algorithms Channel estimation Communication systems Correlation detectors Estimation Matrix algebra