Volume 1 Issue 2
Authors: Zhengde Dai; Xiping Zeng; Murong Jiang; Chuanjian Wang
Abstract: A new kind of the homoclinic solution with oscillatory structure for Davey-Stewartson (DSI and DSII) equation with periodic boundary condition is constructed by using the Hirota’s bilinear form and extended homoclinic test method, respectively. The mechanical feature of the solution is also investigated. Result shows the variety of the structure for the homoclinic solution of one integrable system with periodic boundary condition.
Keywords: Homoclinic Solution; Breather; Davey-Stewartson Equation; Periodic Boundary
Authors: Hirofumi Shimizu
Abstract: The conventionally defined oxide charge (Qo) in thermally oxidized p-type Si(001) wafers is investigated by the frequency-dependent alternating current (AC) surface photovoltage (SPV). Upon etching the oxide layer, a minimum AC SPV was observed nearby SiO2–Si interface. The reduction of AC SPV indicates the appearance of a negative charge. This strongly suggests that a fixed oxide charge (Qf) and oxide trapped charge (Qot) might have been etched off. Then, the possible charge must be Qit which is located to be approximately 2.7 nm from the SiO2-Si interface. This explains that Qf may be situated farther than Qit from the SiO2-Si interface. The Qit density (Dit) is calculated to be 9x1010 cm2・eV-1 by analysing the AC SPV vs frequency relationship which is in good agreement with the previous result. The HF solution-etched p-type Si surface can be positive possibly because Si dangling bonds capture holes from p-type Si substrate. This positive charge may not have the same characteristic as positive Qf. It is because Qf is stable in air exposure at room temperature, in contrast, the positive charge on HF solution-dipped p-type Si surface decreases gradually with air exposure time in the measurements of frequency-dependent AC SPV as previously reported.
Keywords: Si; Oxidation; Fixed Oxide Charge; Interface Trapped Charge; Surface Photovoltage
Authors: Abhishek Misal; G. R. Sinha
Abstract: The Auscultation of the heart sound is a most common method to obtain all the useful information to detect various diseases of cardiovascular system. However one of the main problems of PCG (phonocardiogram) signal analysis is interference of different sound. These sounds may be external or internal. The external sound is avoided by using sound proof room or other method etc. but internal sound like lung sound, vessel sound and muscle contraction sound is unavoidable during the recording of PCG signal. Wavelet is a most successful method for denoising the PCG signal. We have implemented a wavelet based denoising method for separation of lung sound from heart sound. In the wavelet transform (WT) based filter it has been shown that the multiresolution representation of the lung sound signal in the WT domain combined with soft-thresholding can separate the input signal (lung sound) from the nonstationary one (heart sound). The study investigates the different parameter of PCG signal before and after the wavelet based filtering. In this paper we separated the PCG signal from lung sound by different wavelets and found the wavelet which gives the appropriate PCG signal.
Keywords: Lung Sound; Normalized Root Mean Square Error (NMRSE); Peak Signal to Noise Ratio (PSNR); PCG(Phonocardiogram) Signal; Signal to Noise Ratio(SNR); Wavelet Transform
Authors: Vivi Tornari
Abstract: Coherent holographic metrology provides the non-contact potential to retrieve directly from surface measurements of the spatial displacement information originating from the bulk of complex objects suffering inherent faults or physical deterioration. These damage factors endanger the structural integrity and lessen the life span of works of art, inevitably reaching the fragile and precious surface. Interferometry techniques via interference fringes offer NDT for surface authentication and impact analysis and overall quality control in order to provide a signature of precious surface responses or exempt faulted products from the production line. In this paper the 2D interferometry information is instead implemented as a NDT to prevent artworks from physical deterioration. It is proposed a structural diagnosis method via 2D spatial data derived from interference intensity profiles. Thus the paper introduces the concept to diagnose the structural condition via direct contactless interference examination of artwork surface with the prospect of timeless documentation in art conservation field.
Keywords: Holographic Interferometry; Interferometry; Holography; Optical Metrology; Art Conservation; Quality Testing; NDT
Authors: Xingfang Jiang; Wei Zhou; Hong Jiang; Jifang Ouyang
Abstract: For the characteristics of the intelligent processing system of the data in Physics experiment, two basic problems have been put forward. The difference between the two problems was that the weights of the experimental data were not the same. The first one was equal weights. The second one was unequal weights. For the first one the elimination method had been pointed. The datum would be eliminated if it was out of the scope in two times standard deviation near the average. The effective number of the experimental data could be statistics again after the careless error had been eliminated. For the second one the effective data method had been pointed out. The different differential algorithm had been used in the intelligent system for the experiment in determination of sound speed with different numbers of the effective data. The results in the intelligent processing system were following to the rules of the signification figure and uncertainty. The developed intelligent system was suitable for all kinds of physical experiment data which are filled by any experimenter. The shown results were quick and accurate.
Keywords: Intelligent Processing System; Physics Experiment; Statistics; Multimedia