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- Mousavi, S. A., et al.
(författare)
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Three-Dimensional Finite Element Analysis of GaPO4/Pt Surface Acoustic Wave Resonator Based on Cell Model
- 2009
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Ingår i: International Review on Modeling and Simulations. - Italy : Praise Worthy Prize. - 1974-9821 .- 1974-983X. ; 2:4, s. 426-432
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Tidskriftsartikel (refereegranskat)abstract
- This paper present a three-dimensional finite element method for the one-port surface acoustic wave resonator base on GaPO4 with 5° cut for high frequency application. Interdigital transducer is assumed a thin film platinum with chromium as an under-layer material. The simulated frequency response and wave propagation are obtained under base cell model at 433.92 MHz centre frequency under ISM band. Frequency responses versus impedance are compared and verify with the known result in literature. The results show that the total displacements are vanished at a distance of about 2 to 3 wavelength from the surface. As expected, the X and Y displacement are 90°out-of-phase with each other. It is observed that the mass loading effect is suitable for prediction of resonant frequency. It is Q found that the factor value is larger than 1000 and the mode shapes for resonant and anti-resonant condition are different at two edges of stop-band.
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| 5. |
- Shepherd, C. E., et al.
(författare)
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Inflammatory S100A9 and S100A12 proteins in Alzheimer's disease
- 2006
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Ingår i: Neurobiology of Aging. - : Elsevier BV. - 0197-4580 .- 1558-1497. ; 27:11, s. 1554-1563
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Tidskriftsartikel (refereegranskat)abstract
- Inflammation, insoluble protein deposition and neuronal cell loss are important features of the Alzheimer's disease (AD) brain. S100B is associated with the neuropathological hallmarks of AD where it is thought to play a role in neuritic pathology. S100A8, S100A9 and S100A12 comprise anew group of inflammation-associated proteins that are constitutively expressed by neutrophils and inducible in numerous inflammatory cells. We investigated expression of S100B, S100A8, S100A9 and S100A12 in brain samples from sporadic and familial (PS-1) AD cases and controls using immunohistochemistry and Western blot analysis. S100B, S100A9 and S100A12, but not S100A8, were consistently associated with the neuropathological hallmarks of AD. Western blot analysis confirmed significant increases in soluble S100A9 in PS-1 AD compared to controls. S100A9 complexes that were resistant to reduction were also evident in brain extracts. A reactive component of a size consistent with hexameric S100A12 was seen in all cases. This study indicates a potential role for pro-inflammatory S100A9 and S100A12 in pathogenesis caused by inflammation and protein complex formation in AD.
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