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Intelligent method to develop constitutive relationship of Ti-6Al-2Zr-1Mo-1V alloy 被引量:1
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作者 孙宇 曾卫东 +2 位作者 赵永庆 韩远飞 马雄 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第6期1457-1461,共5页
The isothermal compression tests were carried out in the Thermecmastor-Z thermo-simulator at temperatures of 800, 850, 900, 950, 1000 and 1050 ℃ and the strain rates of 0.01, 0.1, 1 and 10 s-1. The influence of defor... The isothermal compression tests were carried out in the Thermecmastor-Z thermo-simulator at temperatures of 800, 850, 900, 950, 1000 and 1050 ℃ and the strain rates of 0.01, 0.1, 1 and 10 s-1. The influence of deformation temperature and strain rate on the flow stress of Ti-6Al-2Zr-IMo-IV alloy was studied. Based on the experimental data sets, the high temperature deformation behavior of Ti-6A1-2Zr-IMo-IV alloy was presented using the intelligent method of artificial neural network (ANN). The results indicate that the predicted flow stress values by ANN model is quite consistent with the experimental results, which implies that the artificial neural network is an effective tool for studying the hot deformation behavior of the present alloy. In addition, the development of graphical user interface is implemented using Visual Basic programming language. 展开更多
关键词 Ti-6A1-2Zr-1Mo-IV alloy artificial neural network constitutive relationship deformation behavior
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Plastic Flow Modeling of Ti-5 Al-2 Sn-2 Zr-4 Mo-4 Cr Alloy at Elevated Temperatures and High Strain Rates 被引量:1
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作者 王宝林 AI Xing +1 位作者 刘战强 LIU Jigang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第3期611-616,共6页
The true stress-sWain relationships of Ti-5A1-2Sn-2Zr-4Mo-4Cr(TC17) alloy with a wide range of strain rates were investigated by tmiaxial quasi-static and dynamic compression tests, respectively. Quasi- static compr... The true stress-sWain relationships of Ti-5A1-2Sn-2Zr-4Mo-4Cr(TC17) alloy with a wide range of strain rates were investigated by tmiaxial quasi-static and dynamic compression tests, respectively. Quasi- static compression tests were carried out with Instron 8874 test machine, while dynamic compression tests were performed with the split Hopkinson pressure bar (SHPB) which was installed with heating device and synchro- assembly system. The dynamic mechanical behaviors tests of TC17 were carded out from room temperature to 800 ℃ at intervals of 200 ℃ and at high sWain rates (5 500-1 9200 s-l). The stress-strain curves considering temperature-sWain rate coupling actions were obtained. The Johnson-Cook constitutive model was developed through data fitting of the stress-sWain curves. The material constants in the developed constitutive model can be determined using isothermal and adiabatic stress-strain curves at different strain rates. The Johnson-Cook constitutive model provided satisfied prediction of the plastic flow stress for TC17 alloy. 展开更多
关键词 Ti-5A1-2Sn-2Zr-4Mo-4Cr SHPB stress-strain curve high temperature high strain rate dynamic constitutive relationship
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Synthesis and Antibacterial Activities of 1,4-Disubstituted Phenyl-5-(halo-2-hydroxyphenyl)imino-1,2,3-triazole
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作者 ZHAO Xu LU Jun-rui +6 位作者 XIN Chun-wei LU Bo-wei BAO Xiu-rong LI Jian-fa LIU Ya YANG Xu-yun YUAN Yi 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2012年第3期424-429,共6页
According to the superposition principle of reinforcement of biological activities, 24 novel 1,4- disubstituted phenyl-5-(halo-2-hydroxyphenyl)imino-l,2,3-triazoles was synthesized and characterized by 1H NMR, ^13C ... According to the superposition principle of reinforcement of biological activities, 24 novel 1,4- disubstituted phenyl-5-(halo-2-hydroxyphenyl)imino-l,2,3-triazoles was synthesized and characterized by 1H NMR, ^13C NMR, elemental analysis and IR. All the target compounds were screened for their antibacterial potential in vitro against Monilia albican, Escherichia coli and Staphylococcus aureus. It was shown that all the compounds possessed efficient antibacterial activities at a concentration of 0.1 mg/mL, even at a concentration of 0.01 mg/mL, some of the compounds still exhibited antibacterial activities against Escherichia coli and Monilia albican. At last, the struc- ture-activity relationship was discussed based on the antibacterial results. 展开更多
关键词 1 4-Disubstituted phenyl-5-(halo-2-hydroxyphenyl)imino-l 2 3-triazole Antibacterial activity Structure-activity relationship
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Design, Synthesis, Antifungal Activities and SARs of (R)-2-Aryl-4,5-dihydrothiazole-4-carboxylic Acid Derivatives 被引量:2
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作者 Jingbo Liu Yuxin Li Youwei Chen Xuewen Hua Yingying Wan Wei Wei Haibin Song Shujing Yu Xiao Zhang Zhengming Li 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2015年第11期1269-1275,共7页
Based on the structure of natural product 2-aryl-4,5-dihydrothiazole-4-carboxylic acid, a series of novel (R)-2-aryl-4,5-dihydrothiazole-4-carboxylic acid derivatives were designed and synthesized. Their structures ... Based on the structure of natural product 2-aryl-4,5-dihydrothiazole-4-carboxylic acid, a series of novel (R)-2-aryl-4,5-dihydrothiazole-4-carboxylic acid derivatives were designed and synthesized. Their structures were characterized by ^1H NMR, ^13C NMR and HRMS. The single crystal structure of compound 9b was determined by X-ray diffraction analysis. The antifungal activities were evaluated for the first time. The bioassay results indicated that most compounds exhibited moderate to good antifungal activities. The antifungal activities of compound 13a (against Cercospora arachidicola Hori), 13d (against Alternaria solani), and 16e (against Cercospora arachidieola Hori) were 61.9%, 67.3% and 61.9%, respectively, which are higher than those of the commercial fungicides chlorothalonil and carbendazim. Moreover, compound 13d exhibited excellent antifungal activities against 7 kinds of the fungi tested (66.7%, 77.3%, 63.0%, 87.9%, 70.0%, 70.0% and 80.0% at 50 μg/mL). Therefore, 13d can be used as a new lead structure for the development of antifungal agents. 展开更多
关键词 (R)-2-aryl-4 5-dihydrothiazole-4-carboxylic acid SYNTHESIS antifungal activity structure-activity relationship
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Size distribution,directional source contributions and pollution status of PM from Chengdu,China during a long-term sampling campaign 被引量:1
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作者 Guo-Liang Shi Ying-Ze Tian +5 位作者 Tong Ma Dan-Lin Song Lai-Dong Zhou Bo Han Yin-Chang Feng Armistead G.Russell 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第6期1-11,共11页
Long-term and synchronous monitoring of PMIo and PM2.s was conducted in Chengdu in China from 2007 to 2013. The levels, variations, compositions and size distributions were investigated. The sources were quantified by... Long-term and synchronous monitoring of PMIo and PM2.s was conducted in Chengdu in China from 2007 to 2013. The levels, variations, compositions and size distributions were investigated. The sources were quantified by two-way and three-way receptor models (PMF2, ME2-2way and ME2-3way), Consistent results were found: the primary source categories contributed 63.4% (PMF2), 64.8% (ME2-2way) and 66.8% (ME2-Bway) to PMIo, and contributed 60.9% (PMF2), 65.5% (ME2-2way) and 61.0% (ME2-3way) to PM2.s. Secondary sources contributed 31.8% (PMF2), 32.9% (ME2-2way) and 31.7% (ME2-3way) to PMIo, and 35.0% (PMF2), 33.8% (ME2-2way) and 36.0% (ME2-3way) to PM2.s. The size distribution of source categories was estimated better by the ME2-3way method. The three-way model can simultaneously consider chemical species, temporal variability and PM sizes, while a two-way model independently computes datasets of different sizes. A method called source directional apportionment (SDA) was employed to quantify the contributions from various directions for each source category. Crustal dust from east-north-east (ENE) contributed the highest to both PM^o (12.7%) and PMzs (9.7%) in Chengdu, followed by the crustal dust from south-east (SE) for PMao (9.8%) and secondary nitrate & secondary organic carbon from ENE for PMzs (9.6%). Source contributions from different directions are associated with meteorological conditions, source locations and emission patterns during the sampling period. These findings and methods provide useful tools to better understand PM pollution status and tn dovolon offoctive nolhltion control gtrateMeg. 展开更多
关键词 PM10 PM2.5 PMF2 ME2-3way Size distribution Source directional apportionment
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