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Duan, Mengying,Liu, Yidong,Ao, Jun,Xue, Lu,Luo, Shilong,Tan, Yu,Qin, Wenling,Song, Choong Eui,Yan, Hailong American Chemical Society 2017 ORGANIC LETTERS Vol.19 No.9
<P>A chiral, fluoride-catalyzed asymmetric cascade sulfaMichael/aldol condensation reaction of 1,4-dithiane-2,5-diol and a series of alpha,beta-unsaturated ketones is described to access chiral trisubstituted tetrahydrothiophene derivatives. The target products, including the spiro tetrahydrothiophene derivatives bearing a five-, six-, and seven-membered ring, were highly functionalized and showed high ee value. This established protocol realized a highly enantioselective reaction with a catalytic amount of KF and Song's chiral oligoEG via in situ generated chiral fluoride to construct useful heterocyclic skeletons with great complexity.</P>
An Efficient Program for Noise Performance Analysis and Low-Noise Design in Electronic Circuits
Luo, Tao,Dai, Yi Song,Guo, Xue Lei 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
A new general efficient program for noise performance analysis and low-noise design in electronic circuits is presented. The circuits may include arbitrary topology and any kind of noise sources. Because the all noise sources can be effected simultaneously and the noise correlation is fully considered, using this program can lead to remarkable improvement on the accuracy and efficiency of noise analysis and design.
Xue Bai,Yinghui Zhao,Zhenhu Song,Hui Chen,Sihang Zhang,Yonghui Luo,YingChun Gu,Shijian Tu,Guo Yao,Sheng Chen 한국섬유공학회 2022 Fibers and polymers Vol.23 No.3
The preparation of polymer nanocomposites combined with high strength, toughness, and high transparencyremains a challenge. Aramid fibers are often used as fiber-reinforced materials for their superior mechanical and thermalproperties, but the weak interfacial force between aramid fibers and matrix polymer limits the application in compositematerials. In this work, aramid nanofibers were prepared by a two-step process, which included deprotonation and acidhydrothermal treatment to obtain better dispersions in general solvents. The hydrothermal aramid nanofibers (HANFs) wereused as reinforcing materials and blended with polyacrylonitrile (PAN) to prepare polyacrylonitrile/aramid nanofibers (PAN/HANFs) composite films with different mass fractions of HANFs. The morphologies of HANFs and the thermal, optical, andmechanical properties of composite films were investigated. Interestingly, when the mass fraction of aramid nanofibers wasless than 1.0 %, the composite films were synchronously strengthened and toughened. When the mass fraction of HANFswas 0.5 %, the tensile strength and toughness of the PAN/HANFs composite film reached 62.04 MPa and 22.56 MJ/m3,which were 74.23 % and 162.31 % higher than the pure PAN film, respectively. Besides, its average transmittance in thevisible light region remained 76.34 %. This work may offer a novel and facile strategy for high transparent reinforcedpolymer composites, which have potential applications in high strength fiber or optical film.
Gao, Xuan-Wen,Yang, Junghoon,Song, Kyeongse,Luo, Wen-Bin,Dou, Shi-Xue,Kang, Yong-Mook The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.46
<P>FeCo alloy nanoparticles were nucleated onto graphitic carbon layers through the pyrolysis of polydopamine (PDA) sub-micrometer spheres to form a highly active electrocatalytic system that exhibits excellent oxygen conversion catalytic activity in both alkaline and acidic media. Owing to the strong metal chelation capability during the chemical modification and high sp<SUP>2</SUP>-dominant carbon yield of PDA, an abundance of non-precious-metal ions were easily trapped and absorbed into the PDA segments at room temperature by catechol and amine functional groups, followed by the <I>in situ</I> nucleation of FeCo alloy nanoparticles on graphitic carbon layers during the pyrolysis. The contents of graphitic nitrogen and pyridinic nitrogen were significantly increased by the presence of the non-precious-metal ions during carbonization as well, which is a result of the chelation effect of non-precious-metal atoms. Meanwhile, the FeCo nanoparticles (diameter < 5 nm) were protected by the multi-layer-graphene-like carbon layer from the harsh acid and uniformly anchored on graphitic carbon sub-microspheres, which can greatly improve the catalytic durability, particularly in acidic media. From the perspective of the whole catalytic system being used as an air electrode in rechargeable Zn-air batteries, the porous nitrogen-doped graphitic carbon framework was functionalised as a continuous conductive framework due to its catalytic activity towards high oxygen conversion and good electrical conductivity.</P>
Guoxiong Deng,Yilei Wang,Xueping Zong,Jiangzhou Luo,Xuezhen Wang,Chunxue Zhang,Song Xue 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
Here we reported a causal relationship between the molecular structure of binaphthol-based polyimideprecursor and the pore-size distribution of the derived carbon membrane. The binaphthol-basedpolyamide acid is synthesized from 2,20-diol-1,10-binaphthyl-6,60-diamine and 4,40-(hexafluoroisopro-pylidene)diphthalic anhydride (6FDA). Then, an azeotropic imidiaztion method was used to synthesizethe polyimide with naphthol groups (XS1). When the imidization is carried out by using acetic anhydride,the polyimide with acetyl groups (XS4) is achieved. The CMS membranes prepared by pyrolyzing XS1 andXS4 at 500, 550, and 600 ℃ are named using the temperature as the suffix, such as XS1-500. Their poreevolution has been investigated using TGA, FTIR, XRD, and Raman measurements. The trimodal pore-sizedistribution is in the carbon molecular sieve (CMS) membranes derived from XS4 and the CMS onesderived from XS1 exhibit a bimodal pore structure. Among them, XS4-500 exhibits the highest gaspermeabilities of 3332 barrer for CO2, 773 barrer for O2, and 119 barrer for N2. XS1-500 only affords theCO2, O2, and N2 permeabilities of 1086, 230, and 30.2 barrer. The esterification of naphthol not justdisturbs the hydrogen bonds between polyimide chains but also affects the pore generation of thederived CMS membranes. Our work provides an effective way to enhance the gas permeability of a CMSmembrane derived from the binaphthol-based polyimide.
Qiu-Yan Chen,Qing-Nan Tang,Lin-Quan Tang,Wen-Hui Chen,Shan-Shan Guo,Li-Ting Liu,Chao-Feng Li,Yang Li,Yu-Jing Liang,Xue-Song Sun,Ling Guo,Hao-Yuan Mo,Rui Sun,Dong-Hua Luo,Yu-Ying Fan,Yan He,Ming-Yuan C 대한암학회 2018 Cancer Research and Treatment Vol.50 No.3
Purpose The measuring Epstein-Barr virus (EBV) DNA is an important predictor of nasopharyngeal carcinoma (NPC). This study evaluated the predictive value of pretreatment serum amyloid A (SAA) and C-reactive protein (CRP) comparing with EBV DNA in patients with NPC. Materials and Methods In an observational study of 419 non-metastatic NPC patients, we prospectively evaluated the prognostic effects of pretreatment SAA, CRP, and EBV DNA on survival. The primary endpoint was progress-free survival (PFS). Results The median level of SAA and CRP was 4.28 mg/L and 1.88 mg/L, respectively. For the high- SAA group (> 4.28 mg/L) versus the low-SAA ( 4.28 mg/L) group and the high-CRP group (> 1.88 mg/L) versus the low-CRP ( 1.88 mg/L) group, the 5-year PFS was 64.5% versus 73.1% (p=0.013) and 65.2% versus 73.3% (p=0.064), respectively. EBV DNA detection showed a superior predictive result, the 5-year PFS in the EBV DNA 1,500 copies/mL group was obviously different than the EBV DNA < 1,500 copies/mL group (62.2% versus 77.8%, p < 0.001). Multifactorial Cox regression analysis confirmed that in the PFS, the independent prognostic factors were including EBV DNA (hazard ratio [HR], 1.788; p=0.009), tumour stage (HR, 1.903; p=0.021), and node stage (HR, 1.498; p=0.049), but the SAA and CRP were not included in the independent prognostic factors. Conclusion The results of SAA and CRP had a certain relationship with the prognosis of NPC, and the prognosis of patients with high level of SAA and CRP were poor. However, the predictive ability of SAA and CRP was lower than that of EBV DNA.