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A Criterion Describing the Dynamic Yield Behavior of PMMA
Ji Qiu,Tao Jin,Buyun Su,Qian Duan,Xuefeng Shu,Erqiang Liu,Xin Li 한국고분자학회 2019 Macromolecular Research Vol.27 No.8
Dynamic uniaxial and multiaxial tests were conducted to characterize the mechanical behavior of poly(methyl methacrylate) (PMMA). In this case, the multiaxial yield behavior of materials can be captured by the shear-compression samples (SCS). The experimental results were compared with different yield criteria, and which does not have a good agreement between theoretical prediction and experimental yield loci of PMMA undergoing combined shear-compression. Therefore, a phenomenological yield criterion is developed, and it notably involves hydrostatic stress sensitivity, lode angle, and one parameter. The parameter can be expressed by the asymmetry of yield strength between the tension and compression. The proposed criterion was verified by the utilization of differently combined shear-compression tests. The investigative results reveal that the proposed criterion can be successfully applied to describe the complex yield behavior of PMMA under dynamic loading conditions. The present study shows an efficient method to develop yield criterion of the reviewed materials.
Studying the Ease of Doing Business and Comparing its difference between Korea and China
Luo Ji qiu 한국유통과학회 2016 KODISA ICBE (International Conference on Business Vol.2016 No.-
Governments play a crucial role in supporting a dynamic ecosystem for firms. The Doing Business project aims to deliver a body of knowledge that will catalyze reforms and help improve the quality of the rules underpinning the activities of the private sector. the Republic of Korea and the china have made good practices in business regulations. In 2002,the World Bank Group outlined a new strategy for tapping private initiative to reduce poverty. Although macro policies are unquestionably important, there is a growing consensus that the quality of business regulation and institutions that enforce it are a major determinant of prosperity, a good regulatory environment is also important. Doing Business is a series of annual reports investigating the scope and manner of regulations that enhance business activity and those that constrain it. The Doing Business project aims to advance the World Bank Group's private sector development agenda: (1)Motivating reforms through country benchmarking; (2)Informing the design of reforms;(3)Enriching international initiatives on development effectiveness; (4)Informing theory. The indicators in the Doing Business represent a new approach to measurement. The focus is on domestic small and medium-size companies. The analysis is based on assessments of laws and regulations, with input from and verification by local experts who deal with practical situations of the type covered in the reports.
The Application of Piezoelectric Materials in Smart Structures in China
Qiu, Jinhao,Ji, Hongli The Korean Society for Aeronautical and Space Scie 2010 International Journal of Aeronautical and Space Sc Vol.11 No.4
Piezoelectric materials have become the most attractive functional materials for sensors and actuators in smart structures because they can directly convert mechanical energy to electrical energy and vise versa. They have excellent electromechanical coupling characteristics and excellent frequency response. In this article, the research activities and achievements on the applications of piezoelectric materials in smart structures in China, including vibration control, noise control, energy harvesting, structural health monitoring, and hysteresis control, are introduced. Special attention is given to the introduction of semi-active vibration suppression based on a synchronized switching technique and piezoelectric fibers with metal cores for health monitoring. Such mechanisms are relatively new and possess great potential for future applications in aerospace engineering.
Ji, Shuang,Yang, Runjun,Lu, Chunyan,Qiu, Zhengyan,Yan, Changguo,Zhao, Zhihui Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.1
The objective of this study was to investigate the correlation between cattle breeds and deposit of adipose tissues in different positions and the gene expressions of peroxisome proliferator-activated receptor gamma ($PPAR{\gamma}$), fatty acid synthase (FASN), and Acyl-CoA dehydrogenase (ACADM), which are associated with lipid metabolism and are valuable for understanding the physiology in fat depot and meat quality. Yanbian yellow cattle and Yan yellow cattle reared under the same conditions display different fat proportions in the carcass. To understand this difference, the expression of $PPAR{\gamma}$, FASN, and ACADM in different adipose tissues and longissimus dorsi muscle (LD) in these two breeds were analyzed using the Real-time quantitative polymerase chain reaction method (qRT-PCR). The result showed that $PPAR{\gamma}$ gene expression was significantly higher in adipose tissue than in LD in both breeds. $PPAR{\gamma}$ expression was also higher in abdominal fat, in perirenal fat than in the subcutaneous fat (p<0.05) in Yanbian yellow cattle, and was significantly higher in subcutaneous fat in Yan yellow cattle than that in Yanbian yellow cattle. On the other hand, FASN mRNA expression levels in subcutaneous fat and abdominal fat in Yan yellow cattle were significantly higher than that in Yanbian yellow cattle. Interestingly, ACADM gene shows greater fold changes in LD than in adipose tissues in Yan yellow cattle. Furthermore, the expressions of these three genes in lung, colon, kidney, liver and heart of Yanbian yellow cattle and Yan yellow cattle were also investigated. The results showed that the highest expression levels of $PPAR{\gamma}$ and FASN genes were detected in the lung in both breeds. The expression of ACADM gene in kidney and liver were higher than that in other organs in Yanbian yellow cattle, the comparison was not statistically significant in Yan yellow cattle.
Characterization and Expression Profile of CMTM3/CKLFSF3
Zhong, Ji,Wang, Yu,Qiu, Xiaoyan,Mo, Xiaoning,Liu, Yanan,Li, Ting,Song, Quansheng,Ma, Dalong,Han, Wenling Korean Society for Biochemistry and Molecular Biol 2006 Journal of biochemistry and molecular biology Vol.39 No.5
CMTM/CKLFSF is a novel family of proteins linking chemokines and TM4SF. In humans, these proteins are encoded by nine genes, CKLF and CMTM1-8/CKLFSF1-8. Here we report the characteristics and expression profile of CMTM3/CKLFSF3. Human CMTM3/CKLFSF3 has a high sequence identity among various species and similar characteristics as its mouse and rat homologues. Established by results both of RT-PCR and Quantitative Real-time PCR, the gene is highly transcribed in testis, leukocytes and spleen. For further verification, we generated a polyclonal antibody against human CMTM3/CKLFSF3 and found that the protein is highly expressed in the testis and some cells of PBMCs. Therefore, CMTM3/CKLFSF3 is an evolutionarily conserved gene that may have important roles in the male reproductive system and immune system. Further studies are necessary to validate its functions in the two systems.
The Application of Piezoelectric Materials in Smart Structures in China
Jinhao Qiu,Hongli Ji 한국항공우주학회 2010 International Journal of Aeronautical and Space Sc Vol.11 No.4
Piezoelectric materials have become the most attractive functional materials for sensors and actuators in smart structures because they can directly convert mechanical energy to electrical energy and vise versa. They have excellent electromechanical coupling characteristics and excellent frequency response. In this article, the research activities and achievements on the applications of piezoelectric materials in smart structures in China, including vibration control, noise control, energy harvesting, structural health monitoring, and hysteresis control, are introduced. Special attention is given to the introduction of semi-active vibration suppression based on a synchronized switching technique and piezoelectric fibers with metal cores for health monitoring. Such mechanisms are relatively new and possess great potential for future applications in aerospace engineering.