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Preparation and photocatalytic activity of a novel BiOCl/g‑C3N4 thin film prepared via spin coating
Wei‑Qin Cai,De‑Fang Zhang,Feng‑Jun Zhang,Won‑Chun Oh 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.3
Novel BiOCl/g-C3N4 thin film photocatalysts were synthesized via a simple two-step spin coating method. The prepared photocatalysts were characterized by X-ray diffraction, scanning electron microscopy, and ultraviolet–visible spectroscopy. The photocatalytic activity of the thin films for the degradation of rhodamine B under visible light (λ ≥ 400 nm) was investigated. The results showed that the BiOCl/g-C3N4 thin film photocatalysts exhibited significantly improved visible light absorption compared to the pure BiOCl thin film. The BiOCl/g-C3N4 film showed a rhodamine B degradation efficiency of 81.0% under visible light, which is 23.8 times higher than that of the pure BiOCl thin film. This excellent photocatalytic activity of the BiOCl/g-C3N4 film can be attributed to its efficient electron–hole separation due to the presence of g-C3N4.
( Xing Wei Wang ),( Wei Wei ),( Wei Qiang Wang ),( Xiao Yan Zhao ),( Hong Guo ),( Dian Chun Fang ) 대한소화기학회 2014 Gut and Liver Vol.8 No.5
Background/Aims: To investigate the differential expression of RING finger (RNF) proteins in Barrett esophagus (BE) and esophageal adenocarcinoma (EAC). Methods: The differential expression of RNFs in normal esophagus (NE), BE, and EAC was screened using microarray assay. Real-time quantitative polymerase chain reaction (PCR), tissue microarray assay, and Western blot analysis were independently performed to detect the mRNA and protein expression of screened RNFs. Results: The expression of nine RNFs in the BE or EAC was 2-fold higher than those in NE. Among these proteins, the RNF32 and RNF121 expression in BE was 20.3-fold and 16.4-fold higher, respectively, than that in NE, and the expression of RNF24, RNF130, RNF141, RNF139, RNF11, RNF14, and RNF159 was upregulated more than 2-fold compared with NE. The expression of nine RNFs was not only upregulated in the EAC but was also positively related to the RNF expression in BE. The PCR results also indicated increased expression of these RNFs in BE and EAC compared to NE. Furthermore, the mRNA expression of all RNFs, except for RNF141 in EAC, was dramatically higher than those in the BE. Similar results were also obtained from the Western blot analysis. Conclusions: A total of nine RNFs play critical roles in the progression of BE to EAC. (Gut Liver 2014;8:487-494)
ON CANTOR SETS AND PACKING MEASURES
Chun Wei,Sheng-You Wen 대한수학회 2015 대한수학회보 Vol.52 No.5
For every doubling gauge g, we prove that there is a Cantor set of positive finite Hg-measure, Pg-measure, and Pg 0 -premeasure. Also, we show that every compact metric space of infinite Pg 0 -premeasure has a compact countable subset of infinite Pg 0 -premeasure. In addition, we obtain a class of uniform Cantor sets and prove that, for every set E in this class, there exists a countable set F, with F = E∪F, and a doubling gauge g such that E ∪ F has different positive finite Pg-measure and Pg 0 -premeasure.
( Chun-chi Lin ),( Shu-chen Wei ),( Been-ren Lin ),( Wen-sy-tsai ),( Jinn-shiun Chen ),( Tzu-chi Hsu ),( Wei-chen Lin ),( Tien-yu Huang ),( Te-hsin Chao ),( Hung-hsin Lin ),( Jau-min Wong ),( Jen-kou 대한장연구학회 2016 Intestinal Research Vol.14 No.3
Background/Aims: With the recent progress in medical treatment, surgery still plays a necessary and important role in treating ulcerative colitis (UC) patients. In this study, we analyzed the surgical results and outcomes of UC in Taiwan in the recent 20 years, via a multi-center study through the collaboration of Taiwan Society of IBD. Methods: A retrospective analysis of surgery data of UC patients from January 1, 1995, through December 31, 2014, in 6 Taiwan major medical centers was conducted. The patients’ demographic data, indications for surgery, and outcome details were recorded and analyzed. Results: The data of 87 UC patients who received surgical treatment were recorded. The median post-operative follow-up duration was 51.1 months and ranged from 0.4 to 300 months. The mean age at UC diagnosis was 45.3±16.0 years and that at operation was 48.5±15.2 years. The 3 leading indications for surgical intervention were uncontrolled bleeding (16.1%), perforation (13.8%), and intractability (12.6%). In total, 27.6% of surgeries were performed in an emergency setting. Total or subtotal colectomy with rectal preservation (41.4%) was the most common operation. There were 6 mortalities, all due to sepsis. Emergency operation and low pre-operative albumin level were significantly associated with poor survival (P =0.013 and 0.034, respectively). Conclusions: In the past 20 years, there was no significant change in the indications for surgery in UC patients. Emergency surgeries and low pre-operative albumin level were associated with poor survival. Therefore, an optimal timing of elective surgery for people with poorly controlled UC is paramount.
Wei-Tsung Chuang,Rong-Hao Guo,Che-Min Chou,Chun-Chieh Wang,Ming-Jay Deng,Jhih-Min Lin,Chun-Yu Chen,Yao-Chang Lee 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
To meet future demands for cutting-edge wearable electronics, flexible supercapacitors must possess many features, such as eco-friendly processing, aesthetic appeal and no health hazards, in addition to have lightweight, robust and excellent cycling stability. We proposed a biomimetic and scalable method to fabricate an all-solid-state flexible supercapacitor (assFSC) using bioinspired clay/polymer nanocomposites as electrode materials and a gel electrolyte. Experimental results from X-ray techniques (tomography, scattering and diffraction) showed that the electrode’s structure features a 3D ant-nest-like framework composed of 2D nacre-like clay nanosheets, i.e. hierarchical layers-within-networks structure. Accordingly, the structural electrodes exhibit high tensile strength of 62 MPa, Young’s modulus of 4.4 GPa, and torsional strength of 165 MPa. Under a large operating potential of 4.0 V, the assFSC exhibited ultrahigh energy density (233.3 W h kg<SUP>-1</SUP> at 2 kW kg<SUP>-1</SUP>), ultrahigh power density (125 kW kg<SUP>-1</SUP> at 55.5 W h kg<SUP>-1</SUP>), and outstanding static cyclability (less than 10% loss after 5,000 cycles). We also performed a cycle-life test under dynamic deformation and demonstrated that the assFSC had charging and discharging abilities during motion, according to particle applications of wearable electronics. Thus stable and superior electrochemical performance can be attributed to the biomimetic layers-within-networks structure, which not only provided robust framework but also induced 3D conducting networks with increasing ion channels and shortening charge transports. The shapeable electrodes made by a molding process could, therefore, be used to meet the demands for fashionable, wearable electronics.
Anatomical Analysis of Fruit Development of Different-Sized ‘Hongro’ and ‘Fuji’ Apple Fruits
Wei-Wei Zheng,Yu-Jeong Kim,Sei-Myong Oh,Ik-Jo Chun 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.2
A major issue in apple marketability is the determination of fruit size. In order to illustrate the mechanism underlying the construction of fruit size, the anatomical observation of mesocarp cells was conducted during fruit development on two apple genotypes that set different-sized fruits, mid season-‘Hongro’/M.9 and late season-‘Fuji’/M.9. It was observed that fruit size of ‘Hongro’ was larger than that of ‘Fuji’ at their respective maturity, although they were grown under the same condition. The microscopic observation of mesocarp cells showed that cell size of ‘Hongro’ and ‘Fuji’ gradually increased during fruit growth developmental stages, with ‘Hongro’ fruit showing 2.4-fold of ‘Fuji’ cell size at their respective maturities. ‘Hongro’ fruit expressed a more active cell proliferation than ‘Fuji’ fruit, which resulted in a significantly larger cell number compared to ‘Fuji’ fruit. Thus, it was demonstrated that the difference in fruit size between the two apple genotypes was attributed to both cell size and cell number. Within the same genotype, large-sized ‘Hongro’ fruit exhibited larger cell size, whereas the large size of ‘Fuji’ fruit was resulted from the greater number of cells. These observations suggested that the two genotypes undergo different mechanisms of fruit construction: cell size is the critical factor for determining the final ‘Hongro’ fruit size, while cell number is dominant for ‘Fuji’ fruit.
Acoustic Emission Monitoring of Grinding-Polishing of Extra-Low Dispersion Lens
Chun-Wei Liu,Hong-Chang Chen,Shih-Chieh Lin 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.1
In this study, acoustic emission (AE) was adopted to monitor the grinding–polishing process of extra-low dispersion (ED) lens. S-FPL51, a raw material of ED lens, exhibits extraordinary optical properties such as high Abbe numbers and low dispersion. However, processing S-FPL51 is difficult because of its mechanical properties such as low hardness and high wear abrasion, which make the adjustment of the lens thickness difficult, and the lens are scratched easily. Therefore, an AE sensor was employed to monitor the grinding–polishing process because of its high sensitivity to material removal. Furthermore, several experiments were conducted to establish a relation between grinding–polishing parameters, such as pressure, rotating speed, root mean square (RMS) value of AE signals, and material removal rate (MRR). The results indicated that MRR is strongly correlated to the RMS of AE signals. Subsequently, several MRR models were derived based on the experimental data, and an AE signal term was introduced into the modified Preston equation to estimate MRR. Moreover, the results indicated the AE sensor to be a potential tool for monitoring the grinding–polishing process of optical lens.