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RISS 인기검색어
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- 저자 : Zhenchao Xu (검색결과 4 건)
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Effects of strain on the optical and magnetic properties of Ce-doped ZnO
Zhenchao Xu,Qingyu Hou,Feng Guo,Xiaofang Jia,Cong Li,Wenling Li 한국물리학회 2018 Current Applied Physics Vol.18 No.12
The magnetic and optical properties of Ce-doped ZnO systems have been widely demonstrated, but the effects of different strains of Ce-doped ZnO systems remain unclear. To solve these problems, this study identified the effects of biaxial strain on the electronic structure, absorption spectrum, and magnetic properties of Ce-doped ZnO systems by using a generalized gradient approximation + U (GGA + U) method with plane wave pseudopotential. Under unstrained conditions, the formation energy decreased, the system became stable, and the doping process became easy with the increase in the distances between two Ce atoms. The band gap of the systems with different strains became narrower than that of undoped ZnO without strain, and the absorption spectra showed a red shift. The band gap narrowed, and the red shift became weak with the increase of compressive strain. By contrast, the band gap widened, and the red shift became significant with the increase of tensile strain. The red shift was significant when the tensile strain was 3%. The systems with −1%, 0%, and 1% strains were ferromagnetic. For the first time, the magnetic moment of the system with −1% strain was found to be the largest, and the system showed the greatest beneficial value for diluted magnetic semiconductors. The systems with −3%, −2%, 2%, and 3% strains were non-magnetic, and they had no value for diluted magnetic semiconductors. The ferromagnetism of the system with −1% strain was mainly caused by the hybrid coupling of Ce-4f, Ce-5d, and O-2p orbits. This finding was consistent with Zener's Ruderman–Kittel–Kasuya–Yosida theory. The results can serve as a reference for the design and preparation of new diluted magnetic semiconductors and optical functional materials.
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REMOTE MONITORING OF WIND-PHOTOVOLTAIC HYBRID GENERATION SYSTEM USING MOBILE PHONE AND INTERNET
허정초(Xu Zhenchao),문채주(Moon Chaejoo),장영학(Chang Younghak),임정민(Lim Jungmin),김태곤(Kim Taegon) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
In this paper, a remote monitoring system of wind-photovoltaic hybrid generation system using mobile phone and internet has been developed. Many kinds of data can be acquired, analyzed and saved automatically by this system. The hybrid system is composed of l[㎾] PV with DC/DC converter, battery banks and 5[㎾] wind power system with power inductor and AC/DC converter. In addition, wind monitoring sensors, voltage and current meters, current transformers and potential transformers are used as accessory instruments. All of these signals are fed into DAQ <Data Acquisition> board after converting the data which have been processed by many types of converters, dividing circuits and signal conditioning circuits. These data can not only be displayed on a computer, transmitted using the server program to remote computer and saved on a computer as a file day by day but also be sent as a CDMA message. The monitored-data can be downloaded, analyzed and saved from server program in real-time via mobile phone or internet at a remote place. All of the programs were designed with Lab VIEW software.
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Ten paths of PKA signaling pathway regulate hepatocyte proliferation in rat liver regeneration
Zhenchao Cheng,Lijuan Duan,Xiaoxia Hao,Zhanpeng Li,Gaiping Wang,Cunshuan Xu 한국유전학회 2012 Genes & Genomics Vol.34 No.4
Generally, protein kinase A (PKA) signaling pathway regulates many physiological activities such as cell proliferation and metabolism. However, little is known about how PKA signaling pathway composed of 16 paths participates in regulating hepatocyte proliferation during rat liver regeneration (LR). To explore the influence PKA signaling pathway upon hepatocytes at gene transcription level, Rat Genome 230 2.0 Array was used to detect expression changes of 225 related genes in isolated hepatocytes from rat regenerating livers, showing that 197 genes were contained in the array and 78 genes were significantly changed. Moreover, bioinformatics and systems biology methods were applied to analyze the precise role of PKA signaling pathway in regulating hepatocyte proliferation during LR, and it was found that 10 paths were related to hepatocyte proliferation during rat LR. In detail, 5 paths including SR→Gα-S→PKA, GPCR→Gα-S→PKA, GPCR→PLC→PKA, ET-1→PLC→PKA and hypoxia→AMP→PKA launched hepatocyte proliferation in initiating phase of LR,and then 3 paths including βR→Gα-S→PKA, GPCR→PLC→PKA and GPCR→Gβγ ┤AcⅤⅥ→PKA enhanced hepatocyte proliferation in progressing phase, whereas 3 paths including TGFB→SMAD3/4→PKA, CaCn→ACIX ┤PKA, SST→Gα-I ┤PKA inhibited hepatocyte proliferation in terminating phase of LR. In conclusion, 78 genes and 10 paths of PKA signaling pathway regulate hepatocyte proliferation in rat LR.
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