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OBJECTIVE To compare the effect on adjacent segment degeneration after cervical disc arthroplasty (CDA) and anterior cervical decompression and fusion (ACDF) for treatment of cervical spondylosis. METHODS Between August 2009 and February 2012, 60 cases of single segmental cervical spondylosis accorded with the inclusion criteria were included. Of 60(More)
Based on transmission line theory, a distributed channel equivalent circuit model was deduced for GaN HEMTs, which confirmed the reliability of the small-signal model extraction strategy for GaN HEMTs. A novel fish-bone structure GaN HEMT was designed and fabricated. A distributed equivalent circuit model was established utilizing distribution modeling(More)
OBJECTIVE To investigate the role of transforming growth factor β1 (TGF-β1) and connective tissue growth factor (CTGF) in pathogenesis and progression of human intervertebral disc degeneration by detecting the expressions of these two factors in different degrees of degenerative discs. METHODS The lumbar intervertebral discs were collected from 33(More)
In this paper, a new method for the separate extraction of the temperature-dependent source (<inline-formula> <tex-math notation="LaTeX">$R_{s}$ </tex-math></inline-formula>) and drain (<inline-formula> <tex-math notation="LaTeX">$R_{d}$ </tex-math></inline-formula>) access resistances in gallium nitride (GaN) high electron-mobility transistors (HEMTs) by(More)
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