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A method utilizing one Phase-shifted Fiber Bragg Grating (PS-FBG) and adaptive particle swarm optimization (APSO) algorithm has been proposed to simultaneously measure the spatial multiple axial stresses, including axial stress and transversal stress. The swarm success rate based dynamic adaptive strategy for the adjusting of inertia weight has been introduced to balance the exploration and exploitation...
Three-dimensional (3-D) digital image correlation (DIC) has been gradually adopted by industry these years. This method utilizes a pair of cameras to accumulate and correlate images through tracking the movement of features on the specimen surface in real time. It is capable of generating both in-plane and out-of-plane deformation during one test. To some extent, it is perfect to be utilized in the...
GeSn alloys are investigated for high-performance tunneling device applications. Samples with relatively high Sn compositions are characterized. GeSn electronic band structures are calculated and basic material parameters are extracted. Based on the established GeSn parameter sets, direct-gap GeSn tunneling field-effect transistors are simulated and analyzed. A higher Sn composition enhances device...
GeSn alloys are promising materials for electronic device applications. In this paper, GeSn samples with relatively high Sn composition are characterized in detail. The electronic band structures of GeSn alloys are calculated by nonlocal empirical pseudopotential method and the corresponding material parameters are extracted for device simulation. Based on the established GeSn parameter set, line-tunneling...
This paper presents a continuation of the previous hygroscopic characterization work on epoxy molding compounds, which aims to accurately measure the diffusivity and coefficient of hygroswelling (CHS) of a die-attach adhesive in MEMS packages. We obtained the CHS of the adhesives from 25 °C to 150 °C through modified DIC quick scanning approach [1-2], which includes strain measurement by digital image...
This paper examines the comprehensive effects of vapor pressure, hygroscopic swelling and thermal expansion on the reliability of stacked die package during soldering reflow by the finite element analysis. First, the moisture concentration distributions were obtained for preconditioning at MSL 1 as well as desorption at the reflow process. For the diffusion modeling, existing normalization approaches...
III–V compound semiconductors have stirred a significant interest over the recent years, due to their advantageous carrier transport properties [1,2]. Particularly, the high hole mobility makes GaSb very attractive for the p-channel MOSFET application [3]. Although many techniques have been developed to improve the performance of GaSb MOSFETs [4], effects of strain engineering on GaSb MOSFETs have...
Stenotrophomonas maltophilia DHHJ, a new feather-degrading bacterium, was subjected to mutation by ultraviolet light for 90 s. The mutant L2 was selected due to its greater activity in comparison with the wild strain. After incubation at 40 °C for 6 days, the feathers degraded by mutant L2 were 1.3-fold more than S. maltophilia DHHJ, and the keratinase was secreted. After cultivation for 6 days in...
Fuzzy clustering analysis is a widely used fuzzy mathematics method ,which could be applied in various fields. Based on the fuzzy set theory, application of fuzzy clustering analysis in microbial enhanced oil recovery (MEOR) was studied. At first, strains which had ability to produce biosurfactant were selected as part of the statistical indicators. Then data were corrected and standardized by empirical...
Three different plasticity index subgrade soil are selected from seasonal frozen soil region. Static triaxial test is executed on the samples exposed to 0 to 7 times closed-system freeze-thaw cycles under different confining pressures. Resilient modulus is obtained from the line segment of deviator stress-strain curve. The results show that the resilient modulus of the same kind of soil increases...
A strain, which demonstrated the capacity of cellulase production from corn bran, was isolated from rotten apple and has been identified as Botryosphaeria dothidea by 18S rDNA sequence. The effects of corn bran concentration, pH, and temperature on cellulase production were studied and the most optimal parameters were 40 g/L corn bran (dry basis), 42 °C, and pH 3.8, respectively. Elimination of MgSO...
In order to reduce production cost of Pseudomonas aeruginosa T1, which has the ability of producing the biosurfactant when using crude oil as the sole carbon source, Three experimental methodologies (Plackett-Burman design (PBD), steepest ascent design (SAD), Central composite rotatable design (CCRD)) were applied to optimize the medium ingredients of the strain. In the verification experiment, the...
Abstract-Elastography is a non-invasive method in which stiffness of soft tissue is displayed as strain images to assist in detecting or classifying tumors. External tissue compression causes axial displacements which are subsequently computed and converted to strain. However, in this processing, periodic artifacts often corrupt the image quality severely. This paper presents a 2-D FFT removal algorithm...
The synergistic effect of microbial consortium S3 (including S3-1, S3-2, S3-3 and S3-4), which has the ability of degrading Polycyclic Aromatic Hydrocarbons was studied by solid phenanthrene as the sole source of carbon and energy. The research showed that only S3-1 had the characteristics of phenanthrene-degrading and other three strains could use the metabolites of S3-1 in different degree. It was...
The generation of load spectrum for epoxy resin blade of large-scale wind turbine is researched in this paper, so are an engineering estimating method of the fatigue failure and accumulated fatigue damage. Meanwhile, Load cases are considered, calculated and evaluated. First, a 3 dimensional finite element modal for calculation of fatigue failure is proposed based on the composite laminated technology...
A novel method of tuning chirped fiber Bragg gratings (CFBGs) without a center wavelength shift is proposed. The designed structure can flexibly control the chirp ratio of the CFBG. The proposed tuning technique has potential applications in the optical communication and fiber sensor field.
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