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Synthesis and characterization of polypyrrole doped by cage silsesquioxane with carboxyl groups
Gang Shi,Youxin Che,Luyan Wu,Yao Rong,Caihua Ni 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.2
Cage silsesquioxane with carboxyl groups (POSS-COOH) was successfully synthesized, after which it was added to polypyrrole (PPy) as a dopant to produce the doped PPy (PPy/POSS-COOH) solution. The PPy/POSSCOOH composites were characterized by FTIR (Fourier transformation infrared spectroscopy), SEM (Scanning electron microscopy), TGA (Thermo-gravimetric analysis), CV (Cyclic voltammetry) and RL (Reflection loss). Compared to PPy without POSS-COOH (un-PPy), the conductivity of PPy/POSS-COOH composites could be improved dramatically, reaching up to 0.850 S/cm at 25 oC. Under N2 atmosphere, the residual rate of PPy/POSS-COOH was 68% at 700 oC, 14% higher than the one of un-PPy. Meanwhile, PPy/POSS-COOH had a reflection loss below −8 dB over 9.35 to 11.20GHz, with a minimum value of −10.32 dB at 10.54 GHz, thus demonstrating higher microwave absorption than un-PPy. This method may provide a facile route to produce doped conducting polymers with POSS-COOH.
Li, Gang,Hong, Keehoon,Yeom, Jiwoon,Chen, Ni,Park, Jae-Hyeung,Kim, Nam,Lee, Byoungho Science in China Press 2014 Chinese optics letters Vol.12 No.6
Graphics processing unit (GPU) based fast calculation method for computer generated spherical hologram (CGSH) of a real-existing object is proposed. Three-dimensional (3D) point cloud is constructed by capturing a real-existing object from multiple directions using a depth camera. The GPU based calculation is used in both hologram generation part and numerical reconstruction part of the CGSH. The improved calculation efficiency is verified by comparing the computation speed between central processing unit (CPU) based and GPU based implementation.
Critical effects of long non-coding RNA on fibrosis diseases
Yue Zhang,Gang Luo,Yi Zhang,Mengjie Zhang,Jian Zhou,Weiwu Gao,Xiuyun Xuan,Xia Yang,Di Yang,Zhiqiang Tian,Bing Ni,Jun Tang 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-
The expression or dysfunction of long non-coding RNAs (lncRNAs) is closely related to various hereditary diseases, autoimmune diseases, metabolic diseases and tumors. LncRNAs were also recently recognized as functional regulators of fibrosis, which is a secondary process in many of these diseases and a primary pathology in fibrosis diseases. We review the latest findings on lncRNAs in fibrosis diseases of the liver, myocardium, kidney, lung and peritoneum. We also discuss the potential of diseaserelated lncRNAs as therapeutic targets for the clinical treatment of human fibrosis diseases.
( Xinqiang Zhu ),( Gang Zhou ),( Peng Ni ),( Xuetong Jiang ),( Hailong Huang ),( Jianqiang Wu ),( Xiaohong Shi ),( Xiaoling Jiang ),( Jianing Liu ) 대한소화기학회 2021 Gut and Liver Vol.15 No.2
Background/Aims: Colorectal cancer (CRC) patients often exhibit peritoneal metastasis, which negatively impacts their prognosis. CD31 and D2-40 have recently been suggested to be predictors of breast cancer prognosis, but their role in colorectal peritoneal metastasis (CRPM) remains unknown. Methods: The expression profiles of CD31 and D2-40 were analyzed in CRC patients with or without CRPM and in CRC cell lines with increasing metastatic potential. Overexpression and short hairpin RNA knockdown assays were performed in CRC cells, and the effects of these alterations on epithelial-mesenchymal transition (EMT) in vitro, growth of xenograft tumors in vivo, and peritoneal metastasis potential in a mouse model of CRPM were examined. Results: The expressions of CD31 and D2-40 were upregulated in CRC tumor tissues and was elevated further in tumor tissues from patients with CRPM. CD31 and D2-40 expression levels exhibited increasing trends parallel to the EMT potential of CRC cells. CD31 and D2-40 are essential for CRC cell EMT in vitro as well as for xenograft tumor growth and peritoneal metastasis in vivo. Conclusions: CD31 and D2-40 contribute to CRPM by promoting EMT and may serve as prognostic markers and therapeutic targets for CRC, particularly in patients with peritoneal metastasis. (Gut Liver 2021;15:273-283)
Wei Li,Gang Ni,Jing Li,Ying Han 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.8
BiOI/HZSM-5 composites were synthesized via a facile and environmentally-benign hydrothermal method. The crystalline structures and morphologies of the powder have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic activity of samples was tested for degradation of methylene blue (MB) and Rhodamine B (RhB) dye under simulated solar light irradiation. The degradation rate of MB and RhB by BiOI/HZSM-5 composite photocatalysts respective reach 99.6% and 98.6% under visible light irradiation, BiOI/ HZSM-5 exhibited the highest photocatalytic performance when compared with pure BiOI.
Hong-jiang Ni,Jin-gang Liu,Zhen-he Wang,Shi-yong Yang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Recent research and development of colorless and optically transparent polyimide (CPI) films have beenreviewed. CPI films possess both of the merits of conventional aromatic PI films and common polymeroptical film; thus have been widely investigated as components for microelectronic and optoelectronicfabrications. The current review coveres the latest research and development for CPI films, includingsynthesis chemistry, manufacturing process, and engineering applications. Especially, this reviewfocuses on the applications of CPI films as flexible substrates for optoelectrical devices, such as flexibleactive matrix organic light emitting display devices (AMOLEDs), flexible printing circuit boards (FPCBs),and flexible solar cells.
Zhi-Hai Ni,Xian-Jun Liang,Jing-Gang Mo,Yi Zhang,Jian-Hua Liang,Yu-Sha Yang,Yong Zhou,Zhao-Hua Li,Jian-Liang Zhang,Yin-Lu Ding,Peng Zhang,Jin-Qing Wang 한국유전학회 2015 Genes & Genomics Vol.37 No.11
We aim to investigate the correlations of hypoxia inducible factor-1a (HIF-1a) C1772T (rs11549465) and G1790A (rs11549467) gene polymorphisms with digestive tract cancers. A sum of 267 digestive tract cancers patients were hospitalized in Taizhou Central Hospital of Zhejiang Province as case group between December 2012 and December 2014. Additionally, 275 healthy people who had a physical examination in our hospital at the same time were selected as control group. Polymerase chain reaction-restriction fragment length polymorphism was utilized for detecting allele and genotype frequency of different locus in case and control group. Meta-analysis was performed using Comprehensive Metaanalysis 2.0 (Biostat Inc., Englewood, New Jersey, USA). Our result showed statistical significance only exists in family history of cancer between case and control group (P\0.05). Both C1772T (rs11549465) and G1790A (rs11549467) polymorphisms showed positive correlations with an increasing risk of digestive tract cancers. The frequencies of TT genotype of C1772T (rs11549465) and GA, AA genotypes of G1790A (rs11549467) polymorphisms in case group were evidently higher compared with the controls (all P\0.05). Besides, the comparison of allele and dominant models of HIF-1a C1772T (rs11549465) and G1790A (rs11549467) between two groups showed a significant difference (all P\0.05). Meta-analysis results further confirmed that the onset risk of digestive tract cancers may be improved under allele and dominant models of HIF-1a C1772T (rs11549465) and G1790A (rs11549467) (all P\0.05). Single nucleotide polymorphisms of HIF-1a C1772T (rs11549465) and G1790A (rs11549467) may play a role in development of digestive tract cancers.
Analysis of Honeycomb and Sandwich Structure Compression Property and the Damage of Double Cell Wall
Lihong Xu,Can Ni,Gang Liu,Junli Li 한국섬유공학회 2023 Fibers and polymers Vol.24 No.9
Sandwich structure is widely used in aviation field due to their high out-of-plane compression properties, shear properties, and outstanding energy absorption characteristics. During the forming process, the aluminum honeycomb will form double cell wall because of adhesive layers. The double cell wall has a great influence on the compressive properties, but there are only few researches on it. In this paper, the influence of double cell wall on the compression performance of sandwich structure was studied, and the failure process of double cell was analyzed from micro perspective. Finite element models of aluminum honeycomb and sandwich structure were established in the software ABAQUS. Moreover, the unit model including double cell wall and single cell wall was also established, and then the effectiveness of the simulation was verified by experiments. The compression experiment was carried out on the universal test machine with sandwich structure and the test speed was set as 2 mm/min. The results show that the failure occurs from one end when the aluminum honeycomb faces with flat compression load alone, while the failure of the sandwich structure starts from the middle of the core. The adhesive layer in the double cell wall is subjected to both compressive stress and tensile stress, and the failure occurs first in tension position. Then, the effects of double cell wall different bonding parameters and different panel layering angles on the compressive properties of the structure were studied. The results show that the structural compression performance increases slowly after the bonding length reaches 4 mm, and the bonding thickness less than 0.1 mm has little influence on the compression performance. The fiber orientation of the panel close to the core can be designed to be 90° which is parallel to the double cell wall, which can effectively improve the flat compression performance.
Analysis and Development of the CFRP Boring Bar for Stability Improvement
Licheng Lu,Can Ni,Gang Liu,Bo Qian,Qinglong An,Zhenzhen Cao,Liqiang Zhang,Junli Li 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12
Boring bars with a large length-to-diameter ratio have become increasingly indispensable for deep hole machining. However, the dynamic performance of conventional boring bars may be inadequate, resulting in vibrations. In this paper, a novel boring bar with composites and a constrained layer damping structure was fabricated to suppress vibrations during the boring operation. Initially, the configuration of the CFRP boring bar was proposed based on theoretical analysis, and then the modal parameters were calculated using the bending strain energy method and cantilever beam theory. Subsequently, the geometric design parameters were optimized analytically using the finite element method. Modal and cutting tests were then conducted to evaluate the cutting stability of a CFRP boring bar with a length-to-diameter ratio of 8.4. The modal parameters, vibration signals, and cutting force signals were measured and compared with a carbide boring bar. The experimental results indicated that there was a significant improvement in the cutting stability of the CFRP boring bar.