http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Qiqi Dong (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Extraction of chitin from white shrimp (Penaeus vannamei) shells using binary ionic liquid mixtures
Qiqi Dong,Weiqiang Qiu,Li Li,Ningping Tao,Ashley Liang Wang,Shanggui Deng,Yinzhe Jin 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
Binary ionic liquid mixtures (IL) were used for the first time to extract chitin from shrimp shells. Twoionic liquids, 1-ethyl-3-methylimidazole acetate ([EMIM][Ac]) and 1-butyl-3-methylimidazole bromidesalt ([BMIM][Br]), were mixed at ratios of 0:1, 1:1, 3:2, 4:1, and 1:0 and the properties of the IL andthe characteristics of extracted chitin were investigated. With an increase in proportion of [EMIM][Ac],the viscosity, dielectric constant, and dielectric loss of IL gradually decreased (p < 0.05), whereas the conductivity,radius of gyration increased (p < 0.05). The best quality of chitin using IL (3:2) was achievedwhen the viscosity, conductivity, and radius of gyration were 0.16 ± 0.00 Pa s, 0.30 ± 0.01 S/m, and 0.10 ± 0.00 nm, respectively. The yield of chitin extraction using IL was 35.72 ± 0.31 %, and this was approximately2.04 times higher than that using the acid-base method (17.50 ± 0.16 %). The Whiteness index(WI) of chitin extracted using IL (3:2) (94.93 ± 0.09) was better than commercial chitin (93.31 ± 0.11),and the secondary structure, surface morphology and thermal stability were similar to commercial chitin. Therefore, the binary ionic liquid mixture can be used as an effective green solvent to extract chitin fromshrimp shells.
-
Wang, Dong,Fang, Jingxuan,Zhang, Qiqi 서울대학교 교육연구소 2021 Asia Pacific Education Review Vol.22 No.3
Since the release of “4%” objective of fscal educational expenditure to GDP in 2012, the Chinese governments at all levels have frequently formulated or changed education fnance policy in light of the complex situation of China’s economic development. The policy changes have ensured the steady growth of education fnancial investment, but also brought a series of unknown or uncertain factors to the allocation of educational resources. According to the text context from the selected mainstream Chinese media in the past two decades, this study creates a newspaper-based policy uncertainty indices of China’s education fscal policy under the framework of Baker (JAMA 131(4):1593–1636, 2016)’s study. We also apply the EGARCH model to test the robustness of the results. Our fndings reveal that the uncertainty indices are highly consistent with the fuctuation of education fscal policy in various stages in China. It suggests that the government sectors should defne the reasonable boundaries of the "tangible hand" and harden the budget in the process of allocating education resources, to eliminate the negative impact brought by the uncertainty of education fscal policy. Moreover, this study puts forward the research prospect of the application of policy uncertainty in the feld of education.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
