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 : Liu Yifei (검색결과 22 건)
- 무료
- 기관 내 무료
- 유료
-
Yifei Liu,Caili Dai,Kai Wangb,Mingwei Zhao,Guang Zhao,Shuai Yang,Zhihu Yan,Qing You 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
Aiming at water shut-off in high temperature reservoirs, the hydroquinone (HQ)–hexamethylenetetra-mine (HMTA) gel system was studied. The gelation performance and effects of various parameters weresystematically evaluated. With increase of the concentrations and temperature, gelation time decreasesand gel strength increases. In addition, gelation rate and gel strength were enhanced on adding acid. Moreover, the gel system shows good salt tolerance. The thermal stability measurement indicates thatthe gel can maintain stability up to 140 8C. Uniformly distributed three-dimensional network structurewas formed in the gel. At last, the gelation mechanism was proposed, illuminating the detailed gelationprocess clearly.
-
-
-
Promotional effect of Ce in NH3-SCO and NH3-SCR reactions over Cu-Ce/ SCR catalysts
Wenjie Liu,Yifei Long,Shinian Liu,Yongyan Zhou,XinTong,Yajie Yin,Xiaoyi Li,Kang Hu,Jiangjun Hu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
Commercial V-W-Ti catalysts were modified with Cu and different contents of Ce to remove slip ammoniaand remaining nitrogen oxide from the end stage of SCR technology. The activities of NH3 oxidation byO2 (NH3-SCO) and NO reduction by NH3 (NH3-SCR) of these catalysts were examined from 150 to 400 ℃. The consequences indicated that the addition of Ce and Cu could considerably enhance NH3 oxidation andNO reduction capacity of the catalysts and Ce was conducive to reduce the detrimental effects of H2O andSO2. The characterization tests indicated that the surface active oxygen increased because of the interactionbetween V, Cu and Ce. Moreover, the loaded Ce and Cu contributed to enhance the surface acidityand redox property of SCR catalysts.
-
Liu, Jinhuan,Ju, Mujie,Wu, Yifei,Leng, Nannan,Algharib, Samah Attia,Luo, Wanhe The Korean Society of Veterinary Science 2022 Journal of Veterinary Science Vol.23 No.5
Background: Florfenicol might be ineffective for treating Staphylococcus aureus small colony variants (SCVs) mastitis. Objectives: In this study, florfenicol-loaded chitosan (CS)-sodium tripolyphosphate (TPP) composite nanogels were prepared to allow targeted delivery to SCV infected sites. Methods: The formulation screening, the characteristics, in vitro release, antibacterial activity, therapeutic efficacy, and biosafety of the florfenicol composite nanogels were studied. Results: The optimized formulation was obtained when the CS and TPP were 10 and 5 mg/mL, respectively. The encapsulation efficiency, loading capacity, size, polydispersity index, and zeta potential of the optimized florfenicol composite nanogels were 87.3% ± 2.7%, 5.8% ± 1.4%, 280.3 ± 1.5 nm, 0.15 ± 0.03, and 36.3 ± 1.4 mv, respectively. Optical and scanning electron microscopy showed that spherical particles with a relatively uniform distribution and drugs might be incorporated in cross-linked polymeric networks. The in vitro release study showed that the florfenicol composite nanogels exhibited a biphasic pattern with the sustained release of 72.2% ± 1.8% at 48 h in pH 5.5 phosphate-buffered saline. The minimal inhibitory concentrations of commercial florfenicol solution and florfenicol composite nanogels against SCVs were 1 and 0.25 ㎍/mL, respectively. The time-killing curves and live-dead bacterial staining showed that the florfenicol composite nanogels were concentration-dependent. Furthermore, the florfenicol composite nanogels displayed good therapeutic efficacy against SCVs mastitis. Biological safety studies showed that the florfenicol composite nanogels might be a biocompatible preparation because of their non-toxic effects on the renal tissue and liver. Conclusions: Florfenicol composite nanogels might improve the treatment of SCV infections.
-
Jinhuan Liu,Mujie Ju,Yifei Wu,Nannan Leng,Samah Attia Algharib,Wanhe Luo 대한수의학회 2022 Journal of Veterinary Science Vol.23 No.5
Background: Florfenicol might be ineffective for treating Staphylococcus aureus small colony variants (SCVs) mastitis. Objectives: In this study, florfenicol-loaded chitosan (CS)-sodium tripolyphosphate (TPP) composite nanogels were prepared to allow targeted delivery to SCV infected sites. Methods: The formulation screening, the characteristics, in vitro release, antibacterial activity, therapeutic efficacy, and biosafety of the florfenicol composite nanogels were studied. Results: The optimized formulation was obtained when the CS and TPP were 10 and 5 mg/mL, respectively. The encapsulation efficiency, loading capacity, size, polydispersity index, and zeta potential of the optimized florfenicol composite nanogels were 87.3% ± 2.7%, 5.8% ± 1.4%, 280.3 ± 1.5 nm, 0.15 ± 0.03, and 36.3 ± 1.4 mv, respectively. Optical and scanning electron microscopy showed that spherical particles with a relatively uniform distribution and drugs might be incorporated in cross-linked polymeric networks. The in vitro release study showed that the florfenicol composite nanogels exhibited a biphasic pattern with the sustained release of 72.2% ± 1.8% at 48 h in pH 5.5 phosphate-buffered saline. The minimal inhibitory concentrations of commercial florfenicol solution and florfenicol composite nanogels against SCVs were 1 and 0.25 μg/mL, respectively. The time-killing curves and live–dead bacterial staining showed that the florfenicol composite nanogels were concentration-dependent. Furthermore, the florfenicol composite nanogels displayed good therapeutic efficacy against SCVs mastitis. Biological safety studies showed that the florfenicol composite nanogels might be a biocompatible preparation because of their non-toxic effects on the renal tissue and liver. Conclusions: Florfenicol composite nanogels might improve the treatment of SCV infections.
-
Design Method of Active Disassembly Structure Triggered by Temperature-Pressure Coupling
Zhifeng Liu,Yifei Zhan,Huanbo Cheng,Xinyu Li,Shaobo Pan 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
Active disassembly products often use active disassembly structures triggered by single temperature or pressure field as reversible joints. These structures can be triggered automatically in extreme or accidental circumstances, thus causing the low reliability of products. For improving the reliability of active disassembly products, working mechanisms of active disassembly structure triggered by temperature-pressure coupling is presented in this article. Through analyzing some typical active disassembly structures, this article presents the design criteria and methods of active disassembly structure triggered by temperature-pressure coupling. The feasibility of these design methods is proved by a case analysis. The results of research shows that the reliability of active disassembly structures triggered by temperature-pressure coupling is improved greatly, which can lay the foundation for the industrial applications of active disassembly methods.
-
Junjun Liu,Hongqiao Zhu,Yifei Pei,Heng Zhang,Jian Zhou,Zaiping Jing 한국생체재료학회 2022 생체재료학회지 Vol.26 No.2
Background: Stent-graft-induced inflammation is an independent risk factor for adverse aortic remodeling in aortic dissection. In this context, we asked that whether a methylprednisolone-loaded stent-graft could reduce inflammation and degradation. Methods: First, a coaxial electrospinning technique was used to create a core-shell film with methylprednisolone encapsulated in the inner of poly (L-lactide-co-caprolactone) nanofibers for controllable drug release. Second, an in vitro study was conducted to evaluate the biocompatibility of the nanofiber meshes. Third, the porcine aortic dissection model was developed to investigate the therapeutic effects of the ethylprednisolone-loaded stent-graft. Results: The results demonstrated that the nanofiber-coated film with a methylprednisolone-poly-caprolactone core layer and a poly (L-lactide-co-caprolactone) shell layer could effectively sustain drug release in vitro. In vivo study showed that the methylprednisolone-loaded stent-graft could reduce degradtion of aortic dissection by regulating inflammation. Conclusions: Overall, the controllable drug release by coaxial nanofiber is a promising approach to alleviate aortic inflammation and promote aortic remodeling after stent-graft implantation.
-
Grafting Effects on Root Activity and Amino Acid Contents in Bleeding Sap of Muskmelon
Tianlai Li,Yifei Liu,Hongyan Qi,Chunming Bai 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.3
The grafting effects on the yield and quality of muskmelon fruits were studied based on the measurements of root activity, acidity, electric conductivity and amino acids of bleeding sap. The results revealed that grafting enhanced significantly the activities of root systems and increased the volume and electric conductivity of bleeding sap in muskmelon during growth period. The fruit yield of grafted plants increased by 9.12%. The amino acids in bleeding sap of self-rooted and grafted muskmelon mainly consisted of threonine and glutamic acid. Grafting decreased significantly the contents of threonine, glutamic acid, cysteine, lysine and NH₃ in bleeding sap in the early and late growth stages, but increased the contents of aspartic acid, threonine, serine, glutamic acid, alanine, valine, isoleucine, leucine, tyrosine, phenylalanine, lysine, histidine and arginine in the middle growth stage. In the late growth stage, the contents of threonine, glutamic acid, cysteine, lysine and arginine in bleeding sap of grafted plants were reduced by 44.88%, 52.45%, 41.67%, 58.62% and 62.61%, respectively. The total amino acid content of self-rooted and grafted muskmelon plants showed the same trend of high-low-high in the whole growth period. In the early and late growth stages, the total amino acid content of self-rooted plants was significantly higher than that of the grafted plants. The increment of total amino acid in self-rooted muskmelon from middle to late growth stage was also greater than that in grafted muskmelon. It is suggested that the nutritional quality of grafted muskmelon fruits might be due to the changes of amino acid supply in bleeding sap.
-
Yuanyuan Qin,Yifei Wang,Jin Liu,Fengfeng Chen,Aiying Yao,Zhanchun Chen,Fu Junyu 한국고분자학회 2022 Macromolecular Research Vol.30 No.12
The mechanical properties of functionalized graphene/polyethylene (f- GRA/PE) composites and graphene/polyethylene (GRA/PE) composites were studied based on the crystallized models with the molecular dynamics simulation in this paper. The effects of GRA and f-GRA with different mass fractions on the mechanical properties of polyethylene were considered. The results showed that the adsorption capacity of polyethylene molecular chains of f-GRA is stronger, the compatibility of f-GRA/PE system is higher with decreasing the interface distance, and the dynamic property of molecular chain is weaker with reducing the radius of gyration of f-GRA/ PE. Furthermore, the reduction of mechanical energy consumption results in the increase of wear resistance of the system, which is more obvious when the mass fraction of f-GRA increases. Finally, the influence of different tensile rates on the composite system was studied. It was found that during the tensile process, the ability of the composite material to resist deformation in the stretching direction is enhanced, and the functionalized graphene inhibits the movement of the molecular chain due to the adsorption force, which improves the yield stress of the f-GRA/PE composite material, thereby increasing the tensile strength. Tensile rate has a certain effect on mechanical properties, and elastic modulus and yield stress increase with the increase of strain rate.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
