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A novel chemometrics method, named Doolittle multivariate calibration, was applied to signal analysis of the spectra of metal three ions without separation. Doolittle algorithm is a numerical analysis method with high accuracy and low cost. In this paper, the method was introduced to simultaneous determination of ternary mixtures of Fe3+, Co2+ and Ni2+. The factors affecting sensitivity were optimized...
Particle filtering is one of the most important and common tracking algorithms in WSN tracking system. The calculation amount of the particle filter is large while the calculation ability and energy power of the WSN nodes are very limited. In some circumstances, in order to improve the real-time ability and decrease the energy consumed of the tracking system, it is appropriate to reduce particles...
In this paper, the influence of aging treatment on microstructures evolution and shear strength in Sn-3.0Ag-0.5Cu, Sn-4.0Ag-0.5Cu and Sn-3.5Ag lead-free solders were investigated. For comparison, the specimens as-soldered and after aging at temperature of 100degC were respectively put up observation for IMC and shear test. Morphology, micro structure and component at interface of solder joint were...
The growth behavior and the morphology of IMCs at the Sn-3.0Ag-0.5Cu/Cu interface were investigated firstly. Then the effect of reflow time on IMCs during reflow soldering was also studied in detail. The reflow time was 15s, 30s, 60s, 120s, 240s and 360s respectively. The scanning electron microscope (SEM) was utilized to observe the microstructure of solder joint and the alloy layer in interface...
In this paper, the reliability of the BGA assembly with underfill material is studied by three-point bend test, mechanical bending fatigue test and thermal fatigue test. With the rapid development of surface mount technology (SMT), ball grid array (BGA)/chip scale package (CSP) are widely used in portable electronic devices, such as phone, pager, and PDA. But to increase reliability of BGA/CSP is...
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