Microelectromechanical System-Based Reconfigurable Terahertz Metamaterial for Polarization Filter, Switch, and Logic Modulator Applications.

The terahertz (THz) metamaterials integrated with microelectromechanical systems (MEMS) have led to the realization of dynamic control in amplitude, phase, polarization, and spin angular momentum of the THz wave. In this study, we demonstrate an MEMS-based reconfigurable THz metamaterial (RTM) composed of a split ring resonator (SRR) for real-time modulation of THz wave. By gradually increasing the polarization angle of the incident THz wave, the resonant frequency of SRR switches from 0.

In vivo diffusion tensor imaging of chronic spinal cord compression : a rat model with special attention to the conus medullaris.

Background Few studies have focused on diffusion tensor imaging (DTI) parameters of the conus medullaris after chronic compression in the cervical spinal cord. Purpose To discuss the correlation of DTI parameters between the chronically compressed cervical spinal cord and the conus medullaris in a rat model at different time points. Material and Methods Fifty female Sprague-Dawley rats were randomized into five groups: control group (group A), sham group (group B), and test groups C, D, and E (1, 2, and 3 weeks after compression, respectively).

[Radiological characteristics and clinical manifestation of isolated lumbar foraminal stenosis].

Objective: To discuss radiological characteristics and clinical manifestation of isolated lumbar foraminal stenosis.

Methods: From March 2011 to March 2014, 21 patients with isolated degenerative lumbar foraminal stenosis accepted lumbar decompression and fusion in Beijing Luhe Hospital. Intervertebral disc space was evaluated by measuring the position of joint-body line on preoperative X-ray.

Magnetic resonance diffusion tensor imaging of cervical spinal cord and lumbosacral enlargement in patients with cervical spondylotic myelopathy.

Purpose: To identify the correlations of diffusion tensor imaging (DTI) indices between the cervical spinal cord and lumbosacral enlargement in healthy volunteers and patients with cervical spondylotic myelopathy (CSM).

Materials And Methods: DTI was performed at the cervical spinal cord and lumbosacral enlargement in 10 CSM patients and 10 volunteers at 1.5T.

The role of the serum RANKL/OPG ratio in the healing of intertrochanteric fractures in elderly patients.

Intertrochanteric fractures occur most commonly in elderly patients. Osteoblasts and osteoclasts have been reported to be regulated by the receptor activator of NF-κB ligand (RANKL) and osteoprotegerin (OPG), during bone modeling and remodeling, respectively. Based on these observations, we hypothesized that the serum levels of RANKL, OPG and the RANKL/OPG ratio are important in the healing of intertrochanteric fractures in elderly patients.

[Mid-term therapeutic effect analysis of cementless total knee arthroplasty without patella replacement].

Objective: To explore the flexibility and reliability of cementless total knee arthroplasty (TKA) without patella replacement through a retrospective study of the mid-term therapeutic effect of the treatment of the patients.

Methods: From June 1997 to March 2000, a consecutive series of 152 (152 knees) cementless TKA performed in Hessing-Stiftung was studied. Among them, there were 63 males and 89 females, with 70 left knees and 82 right knees.