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High Performance Wilkinson Power Divider Using Integrated Passive Technology on SI-GaAs Substrate
Cong Wang,Cheng Qian,De-Zhong Li,Wen-Cheng Huang,Nam-Young Kim 한국전자파학회JEES 2008 Journal of Electromagnetic Engineering and Science Vol.8 No.3
An integrated passive device(IPD) technology by semi-insulating(SI)-GaAs-based fabrication has been developed to meet the ever increasing needs of size and cost reduction in wireless applications. This technology includes reliable NiCr thin film resistor, thick plated Cu/Au metal process to reduce resistive loss, high breakdown voltage metalinsulator-metal(MIM) capacitor due to a thinner dielectric thickness, lowest parasitic effect by multi air-bridged metal layers, air-bridges for inductor underpass and capacitor pick-up, and low chip cost by only 6 process layers. This paper presents the Wilkinson power divider with excellent performance for digital cellular system(DCS). The insertion loss of this power divider is ?0.43 ㏈ and the port isolation greater than ?22 ㏈ over the entire band. Return loss in input and output ports are ?23.4 ㏈ and ?25.4 ㏈, respectively. The Wilkinson power divider based on SI-GaAs substrates is designed within die size of 1.42 ㎟.
( Jie Zhao ),( Cong Qian Cheng ),( Tie Shan Cao ) 한국부식방식학회(구 한국부식학회) 2015 Corrosion Science and Technology Vol.14 No.6
Effects of passive film quality by chemical passivation and solution flow on the corrosion behavior of 304 stainless steel in HCl solution were investigated using a coloration indicator, and by corrosion weight loss, electrochemical polarization and element dissolution measurements. A high redness degree suggests a low passive-film integrity for 304 stainless steel following air exposure, while the minimum redness degree for the samples after chemical passivation suggests a high passive-film integrity. In the static condition,samples subjected to air exposure exhibited a high corrosion rate and preferential dissolution of Fe. Chemical passivation inhibited the corrosion rate due to the intrinsically high structural integrity of the passive film and high concentrations of Cr-rich oxides and hydroxide. Solution flow accelerated corrosion by promoting both the anodic dissolution reaction and the cathodic reaction. Solution flow also altered the preferential dissolution to fast uniform dissolution of metal elements.
Loss of MicroRNA-137 Impairs the Homeostasis of Potassium in Neurons via KCC2
Ting-Wei Mi,Xiao-Wen Sun,Zhi-Meng Wang,Ying-Ying Wang,Xuan-Cheng He,Cong Liu,Shuang-Feng Zhang,Hong-Zhen Du,Chang-Mei Liu,Zhao-Qian Teng 한국뇌신경과학회 2020 Experimental Neurobiology Vol.29 No.2
Neuropsychiatric disorders are the leading cause of mental and intellectual disabilities worldwide. Current therapies against neuropsychiatric disorders are very limited, and very little is known about the onset and development of these diseases, and their most effective treatments. MIR137 has been previously identified as a risk gene for the etiology of schizophrenia, bipolar disorder, and autism spectrum disorder. Here we generated a forebrain-specific MIR137 knockout mouse model, and provided evidence that loss of miR-137 resulted in impaired homeostasis of potassium in mouse hippocampal neurons. KCC2, a potassium-chloride co-transporter, was a direct downstream target of miR-137. The KCC2 specific antagonist VU0240551 could balance the current of potassium in miR-137 knockout neurons, and knockdown of KCC2 could ameliorate anxiety-like behavior in MIR137 cKO mice. These data suggest that KCC2 antagonists or knockdown might be beneficial to neuropsychiatric disorders due to the deficiency of miR-137.