역삼투 공정의 생물막오염에서의 Autoinducer-2 정족수감지의 역할

이선기(Seonki Lee),Xu Huijuan(Huijuan Xu),Chong Tzyy Haur(Tzyy Haur Chong) 대한환경공학회 2021 대한환경공학회 학술발표논문집 Vol.2021 No.11

Research on Performance of LSM Coating on Interconnect Materials for SOFCs

Huijuan Zhai,Wanbing Guan,Zhi Liu,Cheng Xu,Wei Guo Wang 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.12

Experiments were conducted using SUS430 and Crofer 22 APU steels coated by LSM using plasma spray and slurry spray methods, respectively. High-temperature conductivity and oxidation resistance were investigated. For comparison, SUS430 and Crofer 22 APU without LSM coating were also investigated and coefficient of thermal expansion (CTE) was measured. The results show that the materials without LSM coating exhibit almost the same CTE as YSZ electrolyte in a range of temperatures of 550~850oC. When coated with LSM, the oxidation rate of the steels decreases by 30~40% using slurry spray and by 10~30% using plasma spray whereas the steels using plasma spray have a better high-temperature conductivity than the steels using slurry spray. It is thus concluded that the LSM coating has a limited effect on increasing high-temperature conductivity while it can effectively reduce the oxidation of the steels. Experiments were conducted using SUS430 and Crofer 22 APU steels coated by LSM using plasma spray and slurry spray methods, respectively. High-temperature conductivity and oxidation resistance were investigated. For comparison, SUS430 and Crofer 22 APU without LSM coating were also investigated and coefficient of thermal expansion (CTE) was measured. The results show that the materials without LSM coating exhibit almost the same CTE as YSZ electrolyte in a range of temperatures of 550~850oC. When coated with LSM, the oxidation rate of the steels decreases by 30~40% using slurry spray and by 10~30% using plasma spray whereas the steels using plasma spray have a better high-temperature conductivity than the steels using slurry spray. It is thus concluded that the LSM coating has a limited effect on increasing high-temperature conductivity while it can effectively reduce the oxidation of the steels.

Correlation analysis between the karyotypes and phenotypic traits of Chinese cymbidium cultivars

Huijuan Ning,Suyan Ao,Yirong Fan,Jianxin Fu,Chuanmei Xu 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.1

Chinese cymbidium are a group of valuable ornamental plants that is formed by genetically distinct species. Currently, arobust Chinese cymbidium classification system, such as that based on cytotaxonomy, is lacking. To investigate the geneticvariation within Chinese cymbidium, we selected 28 individual Chinese cymbidium cultivars as experimental materialto perform karyotype analysis. The results showed that chromosome number among these 28 cultivars was constant anddiploid (i.e., 2n = 40). In addition, no satellite chromosomes were observed. The karyotypes were more symmetrical andconsisted mainly of 1B and 2B types with a small number of 2A and 2C types. Based on principal component analysis, thefive karyotype parameters with the highest classification values were screened, which revealed that the mean of long to shortarm ratio, the mean relative length of long arms, and the asymmetry coefficient of karyotypes (As.K.) were reliable parametersfor use in Chinese cymbidium cytotaxonomy. Cluster analysis of karyotype parameters successfully identified cultivarsof the bamboo petal, narcissus petal, and plum petal types, thus confirming the accuracy of the cytological classificationsystem. Furthermore, flower traits of Chinese cymbidium were strongly correlated with karyotype parameters. Overall, weconclude that karyotype parameters can provide valuable information for studies on the classification, identification, andgenetic diversity of Chinese cymbidium.

Defending Against sybil-attacks in Peer-to-Peer Networks

Xu Xiang,Lu Huijuan,Chen Lianna 보안공학연구지원센터 2014 International Journal of Security and Its Applicat Vol.8 No.4

Research on Performance of LSM Coating on Interconnect Materials for SOFCs

Zhai, Huijuan,Guan, Wanbing,Li, Zhi,Xu, Cheng,Wang, Wei Guo The Korean Ceramic Society 2008 한국세라믹학회지 Vol.45 No.12

Experiments were conducted using SUS430 and Crofer 22 APU steels coated by LSM using plasma spray and slurry spray methods, respectively. High-temperature conductivity and oxidation resistance were investigated. For comparison, SUS430 and Crofer 22 APU without LSM coating were also investigated and coefficient of thermal expansion (CTE) was measured. The results show that the materials without LSM coating exhibit almost the same CTE as YSZ electrolyte in a range of temperatures of $550{\sim}850^{\circ}C$. When coated with LSM, the oxidation rate of the steels decreases by $30{\sim}40%$ using slurry spray and by $10{\sim}30%$ using plasma spray whereas the steels using plasma spray have a better high-temperature conductivity than the steels using slurry spray. It is thus concluded that the LSM coating has a limited effect on increasing high-temperature conductivity while it can effectively reduce the oxidation of the steels.

Development of a quorum quenching-column to control biofouling in reverse osmosis water treatment processes

Seonki Lee,Huijuan Xu,Scott A. Rice,Tzyy Haur Chonga,오현석 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-

Biofouling is recognized as one of the most problematic fouling types in reverse osmosis (RO) processesand lead to high energy requirements and operating costs. Over the past decade, many studies onmembrane bioreactor (MBR) systems for wastewater applications demonstrated that disrupting cell-cellcommunications among bacteria, called quorum quenching (QQ), is a promising approach to inhibitbiofouling of membranes. Here, we developed the QQ-column as a novel strategy to control biofouling inRO systems. The QQ-column was prepared by incorporating a recombinant bacterial QQ strain intohydrogel beads and embedding these beads inside a column. The QQ-column was installed upstream ofthe RO module to degrade N-acyl homoserine lactone, a quorum sensing (QS) signal, from the feed in alaboratory-scale RO system operating in total recycle mode. The QQ-column reduced the concentrationsof signal molecules by29% in an RO system and mitigated biofilm formation (38.6% reduction of cellnumber) on the membrane, consequently reducing the transmembrane pressure by 50.1%. These resultsdemonstrate that integrating QQ bacteria into columns is a practical method to control biofouling in ROsystems.

Sliding Friction and Wear Behavior of C/C Composites Against 40 Cr Steel

Yicheng Ge,Maozhong Yi,Huijuan Xu,Ke Peng,Lin Yang 한국탄소학회 2009 Carbon Letters Vol.10 No.2

In this work, effects of carbon matrix on sliding friction and wear behavior of four kinds of C/C have been investigated against 40 Cr steel ring mate. Composite A with rough lamination carbon matrix (RL) shows the highest volume loss and coefficient of friction, while composite D with smooth lamination/resin carbon matrix (SL/RC) shows the lowest volume loss. The worn surface of composite A appears smooth, whereas that of composite C with smooth lamination carbon (SL) appears rough. The worn surface of composite D appears smooth under low load but rough under high load. Atomic force microscope images show that the size of wear particles on the worn surface is also dependent on the carbon matrix.

Synthesis and Enhanced Photocatalytic Activity of Black Porous Zr-doped TiO2 Monoliths

Jimin Du,Huiming Wang,Huijuan Chen,Menghe Yang,Xiaoling Lu,Hui Guo,Zhanmin Zhang,Tianwei Shang,Shujue Xu,Wenqi Li,Pianpian Wang,Imran Shakir 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.6

Black Porous Zr-doped TiO2 monoliths were successfully synthesized by a combined route including sol–gel method with polystyrene spheres as template followed by calcination at high temperature in the presence of oxygen. As-synthesized samples were then treated in hydrogen atmosphere at 500℃ for 6 h to obtain black Porous Zr-doped TiO2 monoliths. This as-synthesized black porous Zr-doped TiO2 composite showed relatively narrow bandgap compared to the pure anatase phase of TiO2, which may have its origin from the contributions from the Zr impurity and oxygen vacancies. The photocatalytic activity of the black porous Zr-doped TiO2 monolith was examined by carrying out the dye degradation on Rhodamine B under visible irradiation. Our experimental results indicate that black porous 0.9% Zr-doped TiO2 sample exhibits high photocatalytic activity with the photodecomposition of 95.25% under visible irradiation for 120 min.

Identification and differential expression analysis of anthocyanin biosynthetic genes in root-skin color variants of radish (Raphanus sativus L.)

Rugang Yu,Xueling Du,Jing Li,Lan Liu,Chaomeng Hu,Xiaoling Yan,Yuqing Xia,Huijuan Xu 한국유전학회 2020 Genes & Genomics Vol.42 No.4

Background Taproot skin color is a major trait for assessing the commercial and nutritional quality of radish, and red-skinned radish is confirmed to improve consumer’s interest and health. However, little is known about the molecular mechanisms responsible for controlling the formation of red-skinned radish. Objective This study aimed to identify the differentially expressed anthocyanin biosynthetic genes between red- and whiteskinned radishes and understand the molecular regulatory mechanism underlying red-skinned radish formation. Methods Based on the published complete genome sequence of radish, the digital gene expression profiles of Yangzhouyuanbai (YB, white-skinned) and Sading (SD, red-skinned) were analyzed using Illumina sequencing. Results A total of 3666 DEGs were identified in SD compared with YB. Interestingly, 46 genes encoded enzymes related to anthocyanin biosynthesis and 241 genes encoded transcription factors were identified. KEGG pathway analysis showed that the formation of red-skinned radish was mainly controlled by pelargonidin-derived anthocyanin biosynthetic pathway genes. This process included the upregulation of PAL, C4H, 4CL, CHS, CHI, F3H, DFR, LDOX, and UGT enzymes in SD. CHS genes were specifically expressed in SD, and it might be the key point for red pigment accumulation in red-skinned radish. Furthermore, MYB1/2/75, bHLH (TT8), and WD 40 showed higher expression in SD than in YB. Meanwhile, the corresponding low-abundance anthocyanin biosynthesis enzymes and upregulation of MYB4 might be the factors influencing the formation of white-skinned radish. Conclusion These findings provide new insights into the molecular mechanisms and regulatory network of anthocyanin biosynthesis in red-skinned radish.