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Synthesis of Novel Poly(aryl ether sulfone)s Bearing Bulky Pendants for Gas Separation Membranes
Zhuang Liu,Baijun Liu,Long Li,Yinan Zhang,Zhenhua Jiang 한국고분자학회 2013 Macromolecular Research Vol.21 No.6
A hydroxylated poly(aryl ether sulfone) (PES-OH) was synthesized by a demethylation reaction of a methoxy-functionalized PES (PES-OCH3) using the HCl/pyridine system. Derived from this hydroxylated PES precursor,bulky (2-trifluoromethyl-4-nitro) phenyl (TFN) and benzophenone (BZP) were introduced to the PES backbones as side groups via aromatic nucleophilic substitution reactions. A direct property comparison of PES-OH,PES-OCH3, PES-TFN and PES-BZP has been made, and these analogues exhibited different solubility, thermal properties and gas permeability. PES grafted with the trifluoromethyl side group (PES-TFN) demonstrated more attractive permeabilities and permselectivities for O2/N2 separation compared to the others, and it exhibited the best P(O2)/P(N2) value of 8.44.
Zhuang Xuzhou,Zhang Qinjin,Zeng Yuji,Liu Yancheng,Liu Siyuan,Yu Heyang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4
Traditional droop control methods are diffi cult to achieve accurate and autonomous current sharing between micro-source converters in DC microgrid, due to the mismatch of line impedance and the existence of low-speed communication. In this paper, an autonomous current sharing control strategy based on active frequency injection and line impedance compensation is proposed. Firstly, an active frequency injection method is used for all supported voltage-source converters. Under the feedback mechanism of the reactive power and voltage, the accurate current sharing can be achieved, and the total equivalent droop coeffi cient of each converter would be approximately equal. On the basis, the line impedance compensation information of each converter can be obtained accurately. Then, the original droop control method, in which the droop coeffi cient is the obtained compensation value, is utilized to replace the injection method. Without introducing any communication, this method not only can ensure the accuracy of load current sharing, but also can eff ectively improve the large ripple problem caused by frequency injection method, and avoid the secondary bus voltage drop. The design process and stability of the controller are analyzed in detail. Finally, the feasibility and eff ectiveness of the proposed control strategy are verifi ed by using the corresponding simulation model and HIL experimental platform.
Zhuang Liu 국립민속박물관 2015 International Journal of Intangible Heritage Vol.10 No.-
Understanding the concept of intangible cultural heritage isa theme currently attracting a lot of attention in academiccircles. Based on the definitions in UNESCO’s Convention forthe Safeguarding of the Intangible Cultural Heritage and onthe Interim Measures for Applying for the NationalRepresentative Works of Intangible Cultural Heritage issuedby the Chinese State Council, this article attempts to give anin-depth interpretation of the primary meaning and localisedtransformation of intangible cultural heritage. On the basisof this analysis, the concept of intangible cultural heritage isplaced in a Chinese context and a comparison is made withthe present academic conceptual framework so as tofacilitate an understanding of the validity of the ICH conceptfor the Chinese.
SALT-INDUCED CHLOROPLAST PROTEIN (SCP) is Involved in Plant Tolerance to Salt Stress in Arabidopsis
Yong Zhuang,Yangxuan Liu,Yuxiang Li,Ming Wei,Yuying Tang,Penghui Li,Zhijian Liu,Hui Li,Weizao Huang,Songhu Wang 한국식물학회 2019 Journal of Plant Biology Vol.62 No.6
Soil salinization threats the agricultural productionand food security worldwide. Salt stress induced plantsenescence and chloroplast degradation. However, it remainslargely unknown how the chloroplast-localized proteins affectplant response to salt stress. Here, we characterized a novelgene (At5g39520) in Arabidopsis, which is induced by saltstress and encodes a chloroplast-localized protein. Thus, thisgene was named SALT-INDUCED CHLOROPLAST PROTEIN(SCP). A T-DNA insertion mutant of SCP gene (scp-1)showed the enhanced tolerance to salt stress, as indicated bythe increased survival rates, fresh weights and chlorophyllcontents compared with wild type plants under salt treatment. Salt-induced leaf senescence was also delayed in scp-1 mutant. The scp-1 complementation line and SCP overexpressionlines displayed the hypersensitivity to salt stress. The qRTPCRanalysis indicated that the transcripts of CHLOROPLASTVESICULATION (CV), which mediates stress-inducedchloroplast degradation, were altered in scp-1 mutant andSCP overexpression lines. Taken together, our results suggestthat SCP gene plays a negative role in response to salt stress andhas potential application for genetic modification of improvingplant tolerance to salt stress.
Chunna Liu,Huijiao Lin,Liu Jiawei,Yao Wang,Chunmei Wang,Jinghui Sun,Chunyan Yu,Ying Dong,Wenyue Zhuang,Shu Jing,JianGuang Chen,He Li 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.8
Free radical accumulation in the body will cause oxidative stress damages including the renal damage. Schisandrae Sphenantherae Fructus (Schisandra), a traditional Chinese herbal medicine, has been used throughout the world. Anwulignan, a monomer extracted from Schisandra, has been shown in our previous studies to possess antioxidant and protective effects on the liver, brain and spleen damages in the aging mice. However, its effect on the renal damage caused by aging is not clear. This study showed that anwulignan could significantly increase the kidney index, the creatinine clearance, the activities of superoxide dismutase, catalase and glutathione peroxidase; reduce the urinary protein concentration, the serum urea nitrogen and creatinine content, the content of malondialdehyde and 8-hydroxylated deoxyguanosine in the renal tissue; and improve the renal tissue damage. Moreover, anwulignan increased the production of Nrf2, HO-1 and NQO1 proteins and decreased the production level of Keap1 protein in the renal tissue in the D-galactose induced aging mice. These results suggest that anwulignan significantly alleviates the renal damage by its antioxidant effect through regulating the production of Nrf2/ARE pathway-related proteins in the renal tissue in the D-galactose induced aging mice.
Long Li,Baijun Liu,Siyuan Liu,Zhuang Liu,Yunwu Yu,Liwei Jing,Zhenhua Jiang 한국고분자학회 2013 Macromolecular Research Vol.21 No.7
A new family of sulfonated fluorenyl-containing poly(ether ether ketone ketone)s (SFPEEKKs) were successfully synthesized through a mild postsulfonation in concentrated sulfuric acid at room temperature. Further, a series of “molecule-enhanced” blend membranes were prepared based on SFPEEKKs and an amino-functionalized poly(ether ether ketone) by the solution casting method. These blend membranes generally showed higher thermal stability, lower swelling ratio and methanol permeability and superior mechanical properties in comparison with pristine SFPEEKK membranes. The results showed that some blend membranes may be promising proton exchange membranes for fuel cell applications.
UPF Tracking Method Based on Color and SIFT Features Adaptive Fusion
Yibo Li,Xuezheng Zhuang,Yanmei Liu 보안공학연구지원센터(IJSIP) 2014 International Journal of Signal Processing, Image Vol.7 No.6
Based on the problems that target appears rotation and noise interference in complex environment, an improved multi-feature adaptive fusion tracking method is proposed. The algorithm adopts unscented Kalman particle filter (UPF) to update the measurement information in the sample particles, better overcome the problem of the particle weight degradation. In addition, in order to overcome the defects of additive and multiplicative fusion algorithm in the feature selection, the multiple adaptive fusion characteristics method that target color distribution and scale invariance feature (SIFT) are used as complementary information. Experimental results show that the proposed method is superior to the traditional methods which are based on fixed weight or standard particle filter.
Zheng-Wei Chen,Syeda Anam Hashmi,Tanghong Liu,Wenhui Li,Zhuang Sun,Dongrun Liu,Hassan Hemida,Hong-Kang Liu 한국풍공학회 2022 Wind and Structures, An International Journal (WAS Vol.35 No.5
Due to the complex terrain around high-speed railways, the windbreaks were established along different landforms, resulting in irregular windbreak transition regions between different subgrade infrastructures (flat ground, cutting, embankment, etc). In this paper, the effect of a windbreak transition on the wind flow around railways subjected to crosswinds was studied. Wind tunnel testing was conducted to study the wind speed change around a windbreak transition on flat ground with a uniform wind speed inflow, and the collected data were used to validate a numerical simulation based on a detached eddy simulation method. The validated numerical method was then used to investigate the effect of the windbreak transition from the flat ground to cutting (the “cutting” is a railway subgrade type formed by digging down from the original ground) for three different wind incidence angles of 90º, 75º, and 105º. The deterioration mechanism of the flow fields and the reasons behind the occurrence of the peak wind velocities were explained in detail. The results showed that for the windbreak transition on flat ground, the impact was small. For the transition from the flat ground to the cutting, the influence was relatively large. The significant increase in the wind speeds was due to the right-angle structure of the windbreak transition, which resulted in sudden changes of the wind velocity as well as the direction. In addition, the height mismatch in the transition region worsened the protective effect of a typical windbreak.