Broadband circular polarized reflectarray based on multi‐resonance unit

2021 ◽  
Author(s):  
Tao Liao ◽  
Zhi‐Qiang Zhang ◽  
Yong‐Chang Jiao ◽  
Yang‐Dong Yan ◽  
Guan‐Tao Chen ◽  
...  
Keyword(s):  
Resonance Unit

Stereotactic Accuracy of a 3-Tesla Magnetic Resonance Unit

2003 ◽  
Vol 80 (1-4) ◽  
pp. 140-145 ◽  
Author(s):  
Hooman Azmi ◽  
Michael Schulder
Keyword(s):  
Magnetic Resonance ◽  
3 Tesla ◽  
Resonance Unit

scholarly journals Exploring the Serum Level of RE1 Silencing Transcription Factor in Alzheimer’s Disease

2021 ◽  
Author(s):  
Shashank Shekhar ◽  
Manjari Tripathi ◽  
A. B. Dey ◽  
Sharmistha Dey
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Transcription Factor ◽  
Serum Levels ◽  
P Value ◽  
Standard Curve ◽  
Resonance Unit ◽  
Significant Difference ◽  
Duration Of Disease ◽  
And Gender

Abstract Objective The aim of this study was to evaluate the serum RE1 silencing transcription factor (REST) level in Alzheimer’s disease (AD), mild cognitive impairment (MCI), and elderly controls by using surface plasmon resonance (SPR) technology. Materials and Methods In this case–control study of 133 subjects, 49 patients with AD, 49 patients with MCI, and 35 elderly controls were recruited. The REST protein concentrations were evaluated by SPR. The resonance unit for each sample was recorded and the concentration of serum REST of study group was derived from the standard curve. All the experiments were done in triplicates. Statistical analysis was done and p-value of < 0.05 was considered as statistically significant. Results A significant difference was observed in the Montreal Cognitive Assessment score, Hindi Mental State Examination scale (HMSE) score education, disease duration, and gender among the groups. A significant (p>0.0001) difference in the duration of disease between AD and MCI was observed. It was observed that the mean concentration of serum REST was not significantly (p = 0.266) different among the groups. Conclusion This study first time evaluated the serum levels of REST in AD, MCI and age-matched elderly controls. The rest levels were similar in all groups; however, it can provide a new direction to future blood-based biomarker studies of REST.

Wideband microstrip reflectarray using dual-resonance unit cell

2015 ◽  
Author(s):  
Xiaoyue Xia ◽  
Qi Wu ◽  
Haiming Wang ◽  
Chen Yu ◽  
Wei Hong
Keyword(s):  
Unit Cell ◽  
Resonance Unit ◽  
Dual Resonance

Wideband Millimeter-Wave Microstrip Reflectarray Using Dual-Resonance Unit Cells

2017 ◽  
Vol 16 ◽  
pp. 4-7 ◽  
Author(s):  
Xiaoyue Xia ◽  
Qi Wu ◽  
Haiming Wang ◽  
Chen Yu ◽  
Wei Hong
Keyword(s):  
Millimeter Wave ◽  
Resonance Unit ◽  
Unit Cells ◽  
Dual Resonance

scholarly journals Dynamic Simulation of a Metamaterial Beam Consisting of Tunable Shape Memory Material Absorbers

Vibration ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 81-92
Author(s):  
Hua-Liang Hu ◽  
Ji-Wei Peng ◽  
Chun-Ying Lee
Keyword(s):  
Shape Memory ◽  
Internal Structure ◽  
Dynamic Characteristics ◽  
Vibration Isolation ◽  
Negative Refraction ◽  
Energy Gap ◽  
Physical And Mechanical Properties ◽  
Acoustic Metamaterials ◽  
Theoretical Formulation ◽  
Resonance Unit

Metamaterials are materials with an artificially tailored internal structure and unusual physical and mechanical properties such as a negative refraction coefficient, negative mass inertia, and negative modulus of elasticity, etc. Due to their unique characteristics, metamaterials possess great potential in engineering applications. This study aims to develop new acoustic metamaterials for applications in semi-active vibration isolation. For the proposed state-of-the-art structural configurations in metamaterials, the geometry and mass distribution of the crafted internal structure is employed to induce the local resonance inside the material. Therefore, a stopband in the dispersion curve can be created because of the energy gap. For conventional metamaterials, the stopband is fixed and unable to be adjusted in real-time once the design is completed. Although the metamaterial with distributed resonance characteristics has been proposed in the literature to extend its working stopband, the efficacy is usually compromised. In order to increase its adaptability to time-varying disturbance, several semi-active metamaterials have been proposed. In this study, the incorporation of a tunable shape memory alloy (SMA) into the configuration of metamaterial is proposed. The repeated resonance unit consisting of SMA beams is designed and its theoretical formulation for determining the dynamic characteristics is established. For more general application, the finite element model of this smart metamaterial is also derived and simulated. The stopband of this metamaterial beam with different configurations in the arrangement of the SMA absorbers was investigated. The result shows that the proposed model is able to predict the unique dynamic characteristics of this smart metamaterial beam. Moreover, the tunable stopband of the metamaterial beam with controlling the state of SMA absorbers was also demonstrated.

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