http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Interference Cancellation Scheme for Three-hop Cooperative Relay Networks
( Yinghua Zhang ),( Lei Wang ),( Jian Liu ),( Yunfeng Peng ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.9
In this paper, we focus on interference cancellation for three-hop cognitive radio networks (CRNs) over Rayleigh fading channels. In CRNs, secondary users (SUs) are allowed to opportunistically utilize the licensed spectrum during the idle time of primary users (PUs) to achieve spectrum sharing. However, the SUs maybe power constrained to avoid interference and cover a very short transmission range. We here propose an interference cancellation scheme (ICS) for three-hop CRNs to prolong the transmission range of SUs and improve their transmission efficiency. In the proposed scheme, a flexible transmission protocol is adopted to cancel the interference at both secondary relays and destinations at the same time. And a closed-form expression for the secondary outage probability over Rayleigh fading channels is derived to measure the system performance. Simulation results show that the proposed scheme can significantly reduce the secondary outage probability and increase the secondary diversity in comparison with the traditional cases.
Jia Liu,Yinghua Zhang,Zhiming Bai,Zhian Huang,Yukun Gao,Yuan Yao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.11
An integrated tandem photoelectrochemical (PEC) cell, composed of a three-dimensional (3D) ZnO/CdS/NiFe layered double hydroxide (LDH) core/shell/hierarchical nanowire arrays (NWAs) photoanode and a p-Cu2O photocathode, was designed for unassisted overall solar water splitting in this study. The optical and photoelectrochemical characteristics of ZnO-based photoanodes and Cu2O photocathode were investigated. The results show that ZnO/CdS/NiFe LDH nanostructures offer significantly enhanced performances with a photocurrent density reaching 5.8 mA · cm -2 at 0.9 V and an onset potential as early as 0.1 V (versus RHE). The enhancement can be attributed to the existence of CdS nanoparticles (NPs) which boosts the light absorption in visible region and enhances charge separation. Moreover, the introduction of NiFe LDH nanoplates, with unique hierarchical mesoporous architecture, promotes electrochemical reactions by providing more active sites as co-catalyst. On the above basis, the ZnO/CdS/NiFe LDH–Cu2O two-electrode tandem cell system was established. At zero bias, the device shows a photocurrent density of 0.4 mA · cm -2 along with the corresponding solar-to-hydrogen (STH) conversion efficiency reaching 0.50%. Our results indicate that the tandem PEC cells consisting of metal–oxide–semiconductor photoelectrodes based on Earth-abundant and low-cost materials hold promising application potential for overall solar water splitting.
Jia Liu,Yinghua Zhang,Zhian Huang,Zhiming Bai,Yukun Gao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.2
The pursuit for efficient conversion of methane under ambient conditions remains a challenge. Here, we reported photoelectrocatalytic oxidation of methane into methanol over ZnO nanowire arrays (NWAs) decorated with Au nanoparticles (NPs) under simulated sunlight illumination with ambient conditions. The photoelectrochemical (PEC) performances of the ZnO and ZnO/Au photoanodes were investigated to analyze the behavior and intensity of the reaction process of methane oxidation. The Faradaic efficiency of ZnO/Au was calculated to be 32.11%, nearly three times of 11.69% for ZnO. The above results show that ZnO NWAs exhibited exceptional activity as photoanode for photoelelctrocatalytic methane oxidation, and the decoration of Au NPs further enhanced the photo-activity via the surface plasmon resonance expanding its absorption spectra to visible region. On the other hand, as a co-catalyst, Au can promote the oxidation of methane by providing the trapping sites and active sites to facilitate the separation and also suppress the recombination of photogenerated charges and the existence of Au can boost the reaction by lowering the activation energy. This research demonstrates that ZnO NWAs decorated with Au NPs hold great promise for photoelectrocatalytic methane oxidation.
Sequence analysis and expression of the calmodulin gene, MCaM-3, in mulberry (Morus L.)
Rongjun Fang,Dongqing Hu,Yinghua Zhang,Long Li,Weiguo Zhao,Li Liu,Jialin Cheng,Jinliang Qi,Yonghua Yang 한국유전학회 2011 Genes & Genomics Vol.33 No.2
A full-length cDNA sequence encoding CaM from mulberry,which we designated MCaM-3 (GenBank accession No:GQ303247), was cloned based on mulberry expressed sequence tags(ESTs). Sequence analysis showed that MCaM-3is 951 base pairs in length, encoding 149 amino acids with a predicted molecular weight of 16.85 kD and an isoelectric point of 3.95. Online SMART analysis showed that the MCaM-3 protein has four EFh functional domains, which can bind calcium. The expression level of MCaM-3at different developmental stages in mulberry leaves and flowers and in different tissues was investigated. The results showed that MCaM-3 transcripts are most abundantly expressed in mature tissues, such as mature female flowers and climax leaves, and the expression level of the mRNA could be increased significantly under low temperature, drought, and salt stress conditions compared to the normal growth environment. This research will help us understand the resistance mechanism of functional genes in mulberry.
Preparation and Photocatalytic Mechanism of Ag3PO4/SnO2 Composite Photocatalyst
Fei Li,Guang Zhang,Yinghua Song 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.7
A simple hydrothermal conversion method for the preparation of Ag3PO4/SnO2 composite photocatalyst has been developed. The morphological properties of the nanocomposites are studied using transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), X-ray powder diffraction (XRD) and other methods. Different properties of catalysts are prepared by adjusting the temperature of hydrothermal reaction and the volume ratio. The prepared photocatalyst is tested by degradation of tetracycline solution under visible light show that the degradation rate of tetracycline can reach 74% when the initial [Ag3PO4]/[SnO2] molar ratio is 15 and the temperature is 140 ℃. Moreover, by constructing Ag3PO4/SnO2 composite structure, the impedance and photocurrent of material are enhanced significantly according to the electrochemical characterization.
( Enkhtuya Bayar ),( Yuanyuan Ren ),( Yinghua Chen ),( Yafang Hu ),( Shuncheng Zhang ),( Xuelian Yu ),( Jun Fan ) 한국미생물 · 생명공학회 2021 Journal of microbiology and biotechnology Vol.31 No.12
Tobacco etch virus protease (TEVp) is a useful tool for removing fusion tags, but wild-type TEVp is less stable under oxidized redox state. In this work, we introduced and combined C19S, C110S and C130S into TEVp variants containing T17S, L56V, N68D, I77V and S135G to improve protein solubility, and S219V to inhibit self-proteolysis. The solubility and cleavage activity of the constructed variants in Escherichia coli strains including BL21(DE3), BL21(DE3)pLys, Rossetta(DE3) and Origami(DE3) under the same induction conditions were analyzed and compared. The desirable soluble amounts, activity, and oxidative stability were identified to be reluctantly favored in the TEVp. Unlike C19S, C110S and C130S hardly impacted on decreasing protein solubility in the BL21(DE3), but they contributed to improved tolerance to the oxidative redox state in vivo and in vitro. After two fusion proteins were cleaved by purified TEVp protein containing double mutations under the oxidized redox state, the refolded disulfide-rich bovine enterokinase catalytic domain or maize peroxidase with enhanced yields were released from the regenerated amorphous cellulose via affinity absorption of the cellulose-binding module as the affinity tag.
Jinshan Hu,Pengfei Zhang,Jifang Cui,Weijia An,Li Liu,Yinghua Liang,Qingbin Yang,Hongjun Yang,Wenquan Cui 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-
To achieve rapid separation of electron-hole pairs and improve photocatalytic degradation activity, theFe-g-C3N4 reduced graphene hydrogel (rGH/Fe-g-C3N4) with a 3D network structure was fabricated viathe hydrothermal method. Using visible light irradiation, H2O2 was added to form a photocatalysis-Fenton synergy system. The results showed that the synergistic degradation rate constant of 10% rGH/Feg-C3N4 was 52% higher than that of the multiphase Fenton reaction and 1.5 times higher than that of theFe-g-C3N4. In the seventh cycle, the catalytic efficiency was still as high as 86.9%. Based on the optimizedconditions from phenol degradation, the system was further applied to coking wastewater treatment,and the degradation efficiency of TOC and COD in 60 min reached 66.3% and 68.1%, respectively. Such highand stable degradation performance was ascribed to the synergy effect of photocatalysis and Fenton. Because of the photogenerated electrons not only can promote the Fe3+/Fe2+ cycle, accelerate thedecomposition of H2O2, but also can quickly transfer to graphene and directly decompose H2O2 to formOH. Thus, a large amount ofOH were generated through the two different channels, which greatlyimprove the degradation efficiency. Furthermore, rGH/Fe-g-C3N4 can be regenerated usingfilters withoutthe need for additional complicated processing. This work provides an effective strategy for the deeptreatment of industrial wastewater.