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Long, Jinghai,Lee, Woong-Sup,Chough, Chieyeon,Bae, Il Hak,Kim, B. Moon American Chemical Society 2015 Journal of organic chemistry Vol.80 No.9
<P>A novel synthetic protocol for 8-aryl substituted pyrazolo[1,5-alpha] [1,3,5]triazin-4(3H)-ones was developed employing Pd-catalyzed C-H arylation. The reaction yield was influenced by the presence of a phosphine ligand, pivalic acid, and base selection. With the use of 5-10 mol % catalyst, reactions of 2 with p- or m-substituted aryl bromides proceeded in moderate to good yields. Lower yields were observed with o-substituted aryl bromides. Using this method a precursor for MJL1-109-2, a known nonpeptide CRHR-1 antagonist, was successfully synthesized.</P>
Study on land ecological risk in Shen-Fu Connection Area based on land use change
Wei Wang,Jinghai Zhu,Yuanman Hu,Weiling Liu,Shanshan Tai 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Taking Shen-Fu Connection Area (SFCA) as a case, the purpose of this study is to analyze the characteristics of ecological risk based on land use change. Methods of RS, GIS and statistical analysis were employed. An integrated ecological risk index was built to analyze the ecological risk to landscape change in this region. The results show that the conversion of land type is mainly among agricultural land, construction land and fores land and it can strongly influence the characteristic and distribution of ecological risk, so the integrated ecological risk has been increasing from 1997 to 2008. With the economic development and urbanization course, the degree of land use will be increased and so is the ecological risk. So ecological construction and environment protection should be adopted in this area for sustainable development.
Yang, Peige,Hao, Yue,Feng, Jinghai,Lin, Hai,Feng, Yuejin,Wu, Xin,Yang, Xin,Gu, Xianhong Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.12
The objective of this study was to assess the effects of constant high ambient temperatures on meat quality, antioxidant capacity, and carnosine expression in longissimus dorsi muscle of finishing pigs. Castrated 24 male DLY (crossbreeds between Landrace${\times}$Yorkshire sows and Duroc boars) pigs were allocated to one of three treatments: constant ambient temperature at $22^{\circ}C$ and ad libitum feeding (CON, n = 8); constant high ambient temperature at $30^{\circ}C$ and ad libitum feeding (H30, n = 8); and constant ambient temperature at $22^{\circ}C$ and pair-fed with H30 (PF, n = 8). Meat quality, malondialdehyde (MDA) content, antioxidant capacity, carnosine content, and carnosine synthetase (CARNS1) mRNA expression in longissimus dorsi muscle were measured after three weeks. The results revealed that H30 had lower $pH_{24h}$, redness at 45 min, and yellowness at 24 h post-mortem (p<0.05), and higher drip loss at 48 h and lightness at 24 h post-mortem (p<0.01). Constant heat stress disrupted the pro-oxidant/antioxidant balance in longissimus dorsi muscle with higher MDA content (p<0.01) and lower antioxidant capacity (p<0.01). Carnosine content and CARNS1 mRNA expression in longissimus dorsi muscle of H30 pigs were significantly decreased (p<0.01) after three weeks at $30^{\circ}C$. In conclusion, constant high ambient temperatures affect meat quality and antioxidant capacity negatively, and the reduction of muscle carnosine content is one of the probable reasons.
A Simplified Synchronous Pulse-Width Modulation Method for Three-level Inverter of High-speed Train
Fei Lin,Qiaona Lian,Jialiang Yuan,Zhongping Yang,Zhiqiang Zhang,Yue Xu,Jinghai Jiao 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.12
The synchronous Pulse-Width Modulation (PWM) is quite complex for three-level neutral point-clamped (NPC) inverter. A simple central 60° synchronous modulation method is presented in this paper for three-level NPC inverter used in the multi-mode PWM strategy. For the fundamental voltage command, the switching angle could be real-time calculated based on this modulation method with different carrier frequency ratios. The switching strategy between these modes is discussed for multi-mode PWM. According to this method, a simulation model of the drive system with three-level inverter and induction motor is built. The simulation results at asynchronous modulation, central 60° synchronous modulation and square wave area, show that the output voltage values can meet the requirements with a good symmetry even in the case of low carrier frequency ratio. The smooth switching among different modes is also accomplished with low impulse current.
Enhanced catalyst activity by decorating of Au on Ag@Cu<sub>2</sub>O nanoshell
Chen, Lei,Liu, Maomao,Zhao, Yue,Kou, Qiangwei,Wang, Yaxin,Liu, Yang,Zhang, Yongjun,Yang, Jinghai,Jung, Young Mee Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.435 No.-
<P><B>Abstract</B></P> <P>We successfully synthesized Au-decorated Ag@Cu<SUB>2</SUB>O heterostructures via a simple galvanic replacement method. As the Au precursor concentration increased, the density of the Au nanoparticles (NPs) on the Ag@Cu<SUB>2</SUB>O surface increased, which changed the catalytic activity of the Ag@Cu<SUB>2</SUB>O-Au structure. The combination of Au, Ag, and Cu<SUB>2</SUB>O exhibited excellent catalytic properties, which can further effect on the catalyst activity of the Ag@Cu<SUB>2</SUB>O-Au structure. In addition, the proposed Ag@Cu<SUB>2</SUB>O-Au nanocomposite was used to transform the organic, toxic pollutant, 4-nitrophenol (4-NP), into its nontoxic and medicinally important amino derivative via a catalytic reduction to optimize the material performance. The proposed Au-decorated Ag@Cu<SUB>2</SUB>O exhibited excellent catalytic activity, and the catalytic reduction time greatly decreased (5 min). Thus, three novel properties of Ag@Cu<SUB>2</SUB>O-Au, i.e., charge redistribution and transfer, adsorption, and catalytic reduction of organic pollutants, were ascertained for water remediation. The proposed catalytic properties have potential applications for photocatalysis and localized surface plasmon resonance (LSPR)- and peroxidase-like catalysis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Au-decorated Ag@Cu<SUB>2</SUB>O heterostructures via a simple galvanic replacement method were designed. </LI> <LI> We can easily control the density of the Au NPs on Ag@Cu<SUB>2</SUB>O by changing the concentration of the Au precursor. </LI> <LI> Ag@Cu<SUB>2</SUB>O-Au nanomaterials with high absorption exhibited significantly enhanced catalytic activity for 4-NP. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>