http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
( Yi-xiao Ma ),( Xiao-han Wu ),( Hui-shi Wu ),( Zhan-bo Dong ),( Jian-hui Ye ),( Xin-qiang Zheng ),( Yue-rong Liang ),( Jian-liang Lu ) 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.7
The degradation efficiency and catabolism pathways of the different methylxanthines (MXs) in isolated caffeine-tolerant strain Pseudomonas putida CT25 were comprehensively studied. The results showed that the degradation efficiency of various MXs varied with the number and position of the methyl groups on the molecule (i.e., xanthine > 7-methylxanthine ≈ theobromine > caffeine > theophylline > 1-methylxanthine). Multiple MX catabolism pathways coexisted in strain CT25, and a different pathway would be triggered by various MXs. Demethylation dominated in the degradation of N-7-methylated MXs (such as 7- methylxanthine, theobromine, and caffeine), where C-8 oxidation was the major pathway in the catabolism of 1-methylxanthine, whereas demethylation and C-8 oxidation are likely both involved in the degradation of theophylline. Enzymes responsible for MX degradation were located inside the cell. Both cell culture and cell-free enzyme assays revealed that N-1 demethylation might be a rate-limiting step for the catabolism of the MXs. Surprisingly, accumulation of uric acid was observed in a cell-free reaction system, which might be attributed to the lack of activity of uricase, a cytochrome c-coupled membrane integral enzyme.
Bing Wang,Zhan-qiang Liu,Qinghua Song,Yi Wang,iaoping Ren 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.7 No.1
High energy efficient machining is beneficial for sustainable manufacture which is an important target pursued by workshops. The paper aims to prove the feasibility for reducing cutting energy consumption with ultra-high speed machining (UHSM) of super alloy Inconel 718. Firstly, orthogonal cutting experiments of Inconel 718 are performed with a wide cutting speed range. Through analyses of chip micrographs, it is found that plastic deformation accompanied with ductile fracture contributes to serrated chip formation, while fragmented chips are produced through brittle fracture. The results demonstrate that brittle regime machining can be realized for Inconel 718 with ultra-high cutting speeds. Secondly, considering varied deformation behavior for chips with different morphologies, specific cutting energy models for HSM under varied cutting parameters are developed and verified. Then the influences of cutting speed and uncut chip thickness on cutting energy consumption during HSM are revealed. The research results demonstrate the practicability for reducing cutting energy consumption with brittle regime machining of Inconel 718. At last, the relationship between AE signals and cutting energy consumption is explored, and it proves that AE signals are applicable in monitoring cutting energy consumption. The research can provide guidance for energy saving through optimizing cutting parameters.
Residual Surface Topology Modeling and Simulation Analysis for Micro-Machined Nozzle
Yukui Cai,Zhan-qiang Liu,Zhen-yu Shi,Qinghua Song,Yi Wang 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
The performance of the micro nozzle is determined primarily by its machined surface topology. A circular cross-section micro-Lavalnozzle is modeled and studied by using numerical simulation in this paper. The geometry of residual height and residual area ofmachined nozzle surface with flat-end milling cutter and ball-end milling cutter are created. It is found that the ball end milling cutterwith large diameter is better than the flat one for nozzle finishing operations. The nozzle velocity performance is also revealed in thisresearch. When residual height increased from 0.6 μm to 9.6 μm for nozzle with throat diameter less than 2 mm, the maximum outletvelocity of nozzle reduced gradually. The maximum outlet velocity of nozzle remains stable for the nozzle with throat diameter greaterthan 2 mm. The results show that the maximum outlet velocity of nozzle significantly reduces with throat diameter decreasing underconstant residual height. Based on the analysis about velocity boundary layer, when residual height changing from 0.6 μm to 9.6 μm,the nozzle with throat diameter is 1 mm, has the boundary layer thickness ranging from 5% to 14% of outlet radius.
Flatbands and Emergent Ferromagnetic Ordering in Fe3Sn2 Kagome Lattices
Lin, Zhiyong,Choi, Jin-Ho,Zhang, Qiang,Qin, Wei,Yi, Seho,Wang, Pengdong,Li, Lin,Wang, Yifan,Zhang, Hui,Sun, Zhe,Wei, Laiming,Zhang, Shengbai,Guo, Tengfei,Lu, Qingyou,Cho, Jun-Hyung,Zeng, Changgan,Zhan American Physical Society 2018 Physical Review Letters Vol.121 No.9
Non-Doped Organic Light-Emitting Diodes with Saturated Red Emission
Fei Xiao,Bing-xian Shao,Huan-rong Wu,Hui-ying Fu,Xiao-yuan Hou,Xin-dong Gao,Yi-qiang Zhan 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.2
Non-doped organic light-emitting diodes with saturated red emission were fabricated using 4-(2-(3,3-dicyanomethylene-5,5-dimethyl-1-cyclohexylidene)vinyl)phenyldi(1-naphthyl)amine (DNP-2CN) or 4-(2-(3,3-dicyanomethylene-5,5-dimethyl-1-cyclohexylidene)vinyl)phenyl(1-naphthyl)phe- nylamine (DPN-2CN) as the emitting layer. Different electron-transporting materials, tris(8-hydroxylquinoline) aluminum (Alq$_3$), 2,2',2''-(1,3,5-phenylene)tris[1-phenyl-1$H$-benzimidazole] (TPBI) and 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD), were introduced into the devices for examining their energy level compatibility of DNP-2CN or DPN-2CN. The device with a structure of ITO/ NPB/ DNP-2CN/ BCP/ Alq$_3$/ LiF/ Al showed red emission with $\lambda_{max}$ at 670 nm (CIE coordinates: $x$ = 0.66, $y$ = 0.33) and a high luminance of 438 cd m$^{-2}$ at a driving voltage of 12 V. The device with a structure of ITO/ NPB/ DPN-2CN/ BCP/ Alq$_3$/ LiF/ Al showed a high brightness of 225 cd m$^{-2}$ at a driving voltage of 12 V with $\lambda_{max}$ at 674 nm (CIE coordinates: $x$ = 0.65, $y$ = 0.33).